JPH09212705A - Detector and paper sheet discrimination device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably and accurately detect paper sheets by a simple constitution. SOLUTION: This detector 34c of the paper money discrimination device is provided with a light emitting element 42a for irradiating the surface of paper money P with detection light and a light receiving element 44a for receiving the detection light reflected on the surface of the paper money. Between the light emitting element 42a and the paper money P and between the light receiving element 44a and the paper money P, cylindrical lenses 46a and 48a are respectively provided. Between the paper money P and the cylindrical lenses 46a and 48a, a glass plate 50 for preventing the intrusion of dust to the light emitting element 42a, the light receiving element 44a and the cylindrical lenses 46a and 48a is provided. Between the light emitting element 42a and the light receiving element 44a and between the two cylindrical lenses 46a and 48a, a shield plate 54a extended to the glass plate 50 is provided and the detection light reflected by the glass plate 50 is shielded and is prevented from being made incident on the light receiving element 44a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type detection device for detecting paper sheets such as banknotes and securities, and a paper sheet discriminating device including the same.

[0002]

2. Description of the Related Art As a paper sheet processing apparatus, for example, a banknote processing apparatus is equipped with a banknote discriminating apparatus for discriminating the authenticity, the banknote type, the damage, etc. In this type of bill validator,
A bill is discriminated using a mechanical, magnetic or optical detection device. As an optical detection device, a device that detects various information from detection light transmitted through a bill, a reflection-type device that detects various information from detection light reflected by a bill, and the like are known.

In the reflection type detection device, it is possible to determine the authenticity of a bill from the reflection characteristics of the ink used for printing the bill by appropriately setting the wavelength and intensity of the detection light. it can.

Further, as the reflection type detection device, there are provided a device which performs detection by using diffuse reflection of detection light and a device which performs detection by using specular reflection of detection light. In the detection device using diffuse reflection, the light emitting unit and the light receiving unit of the detection device irradiate the bill with detection light obliquely and receive the reflected light reflected vertically from the bill, or the detection light is bill. It is arranged so that it irradiates the bill vertically and receives the light obliquely reflected on the bill. Further, in the detection device using specular reflection, the light emitting unit and the light receiving unit are
The bills are arranged so as to irradiate the bills with detection light obliquely and to receive the reflected light that is specularly reflected by the bills.

[0005]

In the case of a detecting device utilizing diffuse reflection, in order to sufficiently receive the detection light diffused on the bill surface, the light emitting portion or the light receiving portion must be provided sufficiently away from the bill surface. However, there is a problem that the entire detection device becomes large.

Further, in the reflection type detection device, in order to prevent dust from entering the light emitting portion and the light receiving portion, a transparent window extending parallel to the bill surface is provided between the light emitting portion and the light receiving portion and the bill. Then, the detection light enters the light receiving portion due to the external reflection on the back surface of the window and the internal reflection on the front surface of the window, the dynamic range of the light receiving portion is significantly reduced, and the detection output varies and becomes unstable.

It is possible to coat the window to prevent reflection, but in this case, it is technically possible to transmit only light of a predetermined wavelength or obtain a coating that can withstand friction with bills. Also becomes an economic problem.

On the other hand, in order to prevent the internal reflection of the window, it is conceivable that the window is divided into a light-receiving portion and a light-emitting portion, and the windows are arranged in a substantially V-shape. In this case, dust is placed between these windows. Will be accumulated and the effect of the dustproof window will be reduced.

The present invention has been made in view of the above points, and an object thereof is to provide a detection device capable of stably detecting a paper sheet with a simple structure, and a paper sheet discrimination device including the detection device. It is in.

[0010]

In order to achieve the above object, a detection device according to the present invention according to claim 1 is a light emitting means for irradiating the surface of an object to be detected with detection light, and the object to be detected. A light receiving means for receiving the detection light reflected on the surface of
A first cylindrical lens that collects the detection light emitted from the light emitting means in a predetermined range on the surface of the object to be detected, and is provided between the surface of the object to be detected and the light receiving means, and a predetermined surface of the object to be detected. Of the second cylindrical lens for guiding the reflected light from the range to the light receiving means, and the light emitting means, the light receiving means, the first and the second light emitting means provided between the object to be detected and the first and second cylindrical lenses. A plate-shaped transparent member for preventing dust from entering the cylindrical lens of 2;
A shielding unit that is provided between the light emitting unit and the light receiving unit and between the first and second cylindrical lenses and that shields the detection light reflected by the transparent member to prevent the detection light from entering the light receiving unit. It is characterized by that.

According to a second aspect of the present invention, there is provided a detecting device which emits detection light toward the surface of the object to be detected and light receiving means which receives the detection light reflected on the surface of the object to be detected. And, and these light emitting means and light receiving means,
The optical axes are arranged so as to be substantially perpendicular to the surface of the object to be detected, and are arranged with different lengths from each other with respect to the object to be detected.

According to a third aspect of the present invention, there is provided a detection device including two sets of light emitting means and light receiving means, and the two light emitting means irradiate the surface of the object to be detected with detection lights having different wavelengths.

According to a fourth aspect of the present invention, there is provided a paper sheet discriminating apparatus which is arranged so as to face a conveying means for conveying the paper sheets along a predetermined conveying path and the conveying path. And a detection device that optically detects the surface of the leaves.

The detecting device includes a light emitting means for irradiating the surface of the paper sheet with detection light, a light receiving means for receiving the detection light reflected by the surface of the paper sheet, and the light emitting means. A first cylindrical lens for converging the emitted detection light in a predetermined range on the surface of the paper sheet, and a surface provided between the surface of the paper sheet and the light receiving means are provided. A second cylindrical lens for guiding reflected light to the light receiving means, and the light emitting means, the light receiving means, the first and second cylindrical lenses provided between the paper sheet and the first and second cylindrical lenses. It is provided between the plate-shaped transparent member for preventing dust from entering into it and between the light emitting means and the light receiving means and between the first and second cylindrical lenses, and shields the detection light reflected by the transparent member. The light receiving means It is characterized by comprising, a shielding portion that prevents incidence of.

Claims 1 and 4 constructed as described above
According to the detecting device and the paper sheet discriminating apparatus according to the above, the detection light emitted from the light emitting means is irradiated onto a predetermined area on the object to be detected or the paper sheet surface by the cylindrical lens, and the light receiving means is received through the cylindrical lens. It receives the reflected light from the detection object or the paper sheet and outputs a signal corresponding to the reflected light. The detection light reflected by the transparent member is blocked by the blocking portion, and is prevented from entering the light receiving means.

According to the third aspect of the detection device, two sets of the light emitting means and the light receiving means are provided to detect the same location on the surface of the object to be detected by using the two types of detection light having different wavelengths. The detection result of, that is, the detection output is obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a bill discriminating apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, the bill discriminating apparatus arranged in the bill processing apparatus or the like includes a casing 10 having an elongated rectangular box shape, and a front wall of the casing has an insertion slot 12 for the bills P. And a bill outlet 14 is formed on the rear wall.

A transport path 16 extending from the insertion slot 12 to the discharge slot 14 is defined in the housing 10, and a large number of feed rollers for transporting the banknote P in the direction of arrow A along the transport path. Is provided.

The feed roller is inserted from the insertion port 12 to the ejection port 14.
The first to fourth feed rollers 18, 20, 22, and 24 are arranged side by side at a predetermined distance toward each other.
In addition, the first to fourth feed rollers are provided in plurality along the direction orthogonal to the transport direction A, respectively.

Inside the housing 10, a plurality of aligning rollers 25 are provided which are in rolling contact with the first transport rollers 18 with the transport path 16 sandwiched therebetween, and the first transport rollers and the aligning rollers 25 are inserted. The paper money P carried in through the mouth 12 is aligned with the front end of the paper money P and then fed to the second feed roller 2
Transport to 0 side.

In the vicinity of the second transport roller 20, four magnetic sensors 26 are provided on the opposite side of the transport path 16 with a predetermined distance from each other along the direction orthogonal to the transport direction A. . These magnetic sensors 26 are installed in the transport path 16
The bill P is magnetically detected by contacting the upper surface of the bill P passing through.

Between the first and second conveying rollers 20 and 22, a transmissive contact sensor 3 for detecting the banknote P by the detection light emitted from the LED array 28 and transmitted through the banknote P.
0 is provided.

Further, three thickness sensors 32 for detecting the thickness of the banknote are provided so as to be separated from each other along a direction orthogonal to the transport direction A and to be in contact with the fourth feed roller 24 respectively. .

Further, in the housing 10, a pair of left and right first detecting devices 34a and 34b for optically detecting the bills from the front side of the bills P are provided above the conveying path 16.
Below the conveyance path 16, a pair of left and right second detection devices 36a and 36b that optically detect a bill from the back surface side of the bill P are provided.
Is provided.

In addition, a timing sensor 38, a speed sensor 39, a reference position sensor 40, etc. are provided in the housing 10. Next, the first and second detection devices 34a,
34b, 36a, and 36b will be described in detail. Since all of these detection devices have the same configuration, the configuration will be described in detail on behalf of the first detection device 34a.

As shown in FIG. 3, the first detection device 34a
Has a rectangular parallelepiped housing 40 made of resin. The housing 40 is supported by a support frame 41 of the bill discriminating apparatus, and its upper surface faces the transport path 16 with a predetermined distance therebetween. And in the housing 40,
Two sets of the light emitting unit and the light receiving unit are embedded to form first and second detection units 43a and 43b that detect the banknote P with the detection lights of different wavelengths.

That is, the housing 40 is formed with a plurality of recesses on the upper surface thereof, and the first light emitting element 42a and the first light receiving element 44a constituting the first detecting portion 43a are formed in these recesses. Are arranged side by side in a direction orthogonal to the transport direction A, and the second light emitting element 42b and the second light receiving element 44b forming the second detection unit 43b are disposed in a direction orthogonal to the transport direction A. They are arranged side by side. The first and second detection units 43a and 43b are arranged side by side in the transport direction A, and can detect the same portion of the banknote P, respectively.

The first light emitting and light receiving elements and the second light emitting and light receiving elements are formed in substantially the same shape, and their optical axes O are perpendicular to the surface of the banknote P passing through the conveying path 16. It is arranged so that. Then, the first light emitting element 42a emits the first detection light toward the surface of the banknote P, and the first light receiving element 44a receives the first detection light reflected on the surface of the banknote P. Similarly, the second light emitting element 4
2b irradiates the surface of the banknote P with the second detection light, and the second light receiving element 44b receives the second detection light reflected by the surface of the banknote P. The first and second detection lights have different wavelengths, and for example, red light is used as the first detection light and infrared light is used as the second detection light.

The first detector 43a faces the first light emitting side cylindrical lens 46a provided above the first light emitting element 42a and the first light receiving element 44a. The first light-receiving side cylindrical lens 48a is provided. The first light-emitting side and light-receiving side cylindrical lenses 46a and 48a are formed in a semicircular cross section, and the housings 40 have their central axes coaxial with each other and extending in a direction orthogonal to the transport direction A. Is disposed in the recess.

As shown in FIGS. 3 and 4, the first light-emitting side cylindrical lens 46a includes a first light-emitting element 42.
The first detection light radially emitted from a is narrowed down only in the width of the banknote P along the transport direction A, and the irradiation range B1 of the detection light on the banknote P is elongated in the direction orthogonal to the transport direction A. Similarly, the first light-receiving side cylindrical lens 48a has the first light-receiving element 44a on the surface of the banknote P.
The light receiving range C1 is narrowed down only in the width of the banknote P along the conveyance direction A, and is elongated in the direction orthogonal to the conveyance direction A. Therefore, the first detector 43a has high sensitivity to the region D1 where the irradiation range B1 and the light receiving range C1 overlap.

Further, the first light receiving element 44a is provided at a position higher than the first light emitting element 42a, and the distance from the surface of the bill P is set shorter than that of the first light emitting element 42a. In this way, by arranging the first light receiving element 44a close to the banknote P and the first light receiving side cylindrical lens 48a, the light receiving area C1 of the first light receiving element 44a.
Can be made slightly larger than the irradiation region B1 of the first light emitting element 42a. Therefore, the first detection unit 43a can obtain a stable output from the highly sensitive region D1 without being influenced by variations in the light emitting element and the light receiving element.

Similarly, the second detector 42b also faces the second light emitting side cylindrical lens 46b provided above the second light emitting element 42b so as to face above the second light receiving element 44b. And a second light-receiving side cylindrical lens 48b provided. The second light-emitting side and light-receiving side cylindrical lenses 46b and 48b are formed in a semicircular cross section, and the housings 40 have their central axes coaxial with each other and extending in the direction orthogonal to the transport direction A. Is disposed in the recess.

As shown in FIGS. 3 and 4, the second light-emitting side cylindrical lens 46b includes a second light-emitting element 42.
The second detection light radially emitted from b is narrowed down only in the width along the conveyance direction A of the banknote P, and the irradiation range B2 of the detection light on the banknote P is elongated in the direction orthogonal to the conveyance direction A. Similarly, the second light-receiving side cylindrical lens 48b has the second light-receiving element 44b on the surface of the banknote P.
The light receiving range C2 is narrowed down only in the width of the banknote P along the transport direction A, and is elongated in the direction orthogonal to the transport direction A. Therefore, the second detector 43b has high sensitivity to the region D2 where the irradiation range B2 and the light receiving range C2 overlap.

Further, the second light receiving element 44b is provided at a position higher than the second light emitting element 42b, and the distance from the surface of the bill P is set shorter than that of the second light emitting element 42b. By thus disposing the second light receiving element 44b close to the banknote P and the second light receiving side cylindrical lens 48b, the light receiving area C2 of the second light receiving element 44b is obtained.
Can be made slightly wider than the irradiation region B2 of the second light emitting element 42b. Therefore, the second detection unit 43b can obtain a stable output from the highly sensitive region D2 without being affected by variations in the light emitting element and the light receiving element.

As shown in FIG. 3, a transparent glass plate 50 as a transparent member is fixed to the upper surface of the housing 40 so as to cover the openings of the plurality of recesses. Glass plate 50
Are arranged in parallel with the conveyance path 16 of the bill P, and the housing 4
With 0, dust is prevented from entering the light emitting element, the light receiving element, and the cylindrical lens.

As described above, when the glass plate 50 is provided between the light emitting element and the light receiving element and the bill surface,
A part of the detection light emitted from the light emitting element is a glass plate 50.
There is a possibility that the light will be reflected on the back surface or the front surface of the paper money and directly enter the light receiving element without reaching the bill P.

Therefore, the housing 40 of the detection device 34c
Is configured to include a shielding portion 52 that shields the reflected light from the glass plate 50. That is, the shield 5
Reference numeral 2 denotes a space between the first light emitting and light receiving elements 42a and 44a, and a first light emitting side and light receiving side cylindrical lens 4
A first shield plate 54a extending to the back surface of the glass plate 50 passing between 6a and 48a, and a second light emitting and receiving element 42.
b, 44b, and between the second light-emitting side and light-receiving side cylindrical lenses 46b, 48b.
And a second shielding plate 54b extending to the back surface of the. These first and second shielding plates 54a and 54b are
It is formed integrally with the housing 40 by resin.

The thickness of the first and second shielding plates 54a and 54b is determined according to the positions of the light emitting element, the light receiving element, the glass plate 50, and the thickness of the glass plate. That is, the intersection of the respective light paths of the light emission and the light reception is set to be located on the same surface as or slightly outside the surface of the glass plate 50. With such a configuration, the light emitting element 42
It is possible to prevent the detection light emitted from a and 42b from entering the light receiving elements 44a and 44b due to external reflection on the back surface of the glass plate 50 and internal reflection on the glass plate surface.

The first detecting portion 43a and the second detecting portion 43b are separated from each other by a partition wall 56 formed integrally with the housing 40. According to the bill discriminating apparatus configured as described above, the bill P inserted from the insertion slot 12 is conveyed in the conveying direction A by the first to fourth feed rollers 18, 20, 22, 24 as the conveying means. To be done.

During this time, the first and second detection devices 34
The a, 34b, 36a, and 36b detect the front side and the back side of the banknote P, respectively. That is, the first of the detection devices
And 2nd detection part 43a, 43b irradiates the 1st and 2nd detection light of a different wavelength to the predetermined position of the banknote P surface, detects the reflected light from the banknote P, and according to the intensity of reflected light. Output signal. The output of each detection unit varies depending on the original optical characteristics of the ink of the banknote P, that is, the difference in reflectance depending on the color of the ink, or the surface state of the banknote such as flatness or unevenness. . Therefore, it is possible to optically detect the authenticity of the banknote P, the banknote type, the damage, and the like by checking the fluctuation of the output from the detection unit.

For example, the detection device can detect a counterfeit bill that mimics only color by color copying. That is, since the surface of the banknote, that is, the printing surface has irregularities, the output obtained from a copy counterfeit bill or a printed counterfeit note with a flat surface even if the ink is the same color as the banknote is the output obtained from the bill surface. Will be larger than. Therefore, the output corresponding to the counterfeit bill can be separated and detected, and the bill can be discriminated.

The first and second detectors 34a, 3a
Since 4b detects the same portion of the bill separately with light of different wavelengths, it is possible to obtain two types of detection outputs from the bill surface, and even if one wavelength cannot clearly discriminate the authenticity of the bill, The other wavelength can be accurately discriminated.

Further, since the reflected light from the glass plate 40 can be shielded by the first and second shield plates 54a and 54b provided in the housing 40 to prevent the light from entering the light receiving element, the dynamic range of the detection output is lowered. Can be prevented, and accurate and stable detection can be made possible.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the present invention. For example, the first and second detection lights are not limited to red light, infrared light, and the like, and light of any wavelength can be used. Further, each of the shielding plates 54a and 54b may be formed separately from the housing 40.

In the above embodiment, the light receiving element is provided at a position higher than the light emitting element in order to stabilize the output, but conversely, even when the light emitting element is provided at a higher position than the light receiving element. Paper sheets can be detected without being affected by the glass plate. Further, the detection device and the discrimination device of the present invention can be applied to the detection and discrimination of not only paper money but also other paper sheets such as securities.

[0046]

As described in detail above, according to the present invention, a detection device capable of stably detecting paper sheets without being affected by dust-proof glass plates and the like with a simple structure, and the same are provided. A paper sheet discriminating apparatus can be provided.

[Brief description of drawings]

FIG. 1 is a sectional view of a bill discriminating apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the bill discriminating apparatus.

3A is a plan view of a detection device installed in the bill discriminating device, FIG. 3B is a cross-sectional view of the detection device, and FIG. 3C is FIG. 3B. [FIG. 3] A sectional view of the detection device in a direction orthogonal to FIG.

FIG. 4 is a diagram showing irradiation and light receiving ranges and characteristics of the detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Housing 12 ... Insertion port 14 ... Ejection port 16 ... Conveyance path 18, 20, 22, 24 ... Feeding rollers 34a, 34b, 36a, 36b ... Detecting device 40 ... Housing 42a ... First light emitting element 42b ... Second 43a ... First detection section 43b ... Second detection section 44a ... Second light receiving element 44b ... Second light receiving element 46a ... First light emitting side cylindrical lens 46b ... Second light emitting side cylindrical lens 48a ... 1st light-receiving side cylindrical lens 48b ... 2nd light-receiving side cylindrical lens 50 ... Glass plate 52 ... Shielding part 54a ... 1st shielding plate 54b ... 2nd shielding plate

Claims (6)

[Claims] 1. A light emitting means for irradiating the surface of an object to be detected with detection light, a light receiving means for receiving the detection light reflected by the surface of the object to be detected, and a detection light emitted from the light emitting means. A first cylindrical lens that collects light on a predetermined range on the surface of the object to be detected, and a light receiving means that is provided between the surface of the object to be detected and the light receiving means, and reflects light reflected from the predetermined area on the surface of the object to be detected. The second cylindrical lens that guides the light to the light source, the light receiving unit, the light receiving unit, and the first and second cylindrical lenses that are provided between the detected object and the first and second cylindrical lenses. A plate-shaped transparent member for preventing light is provided between the light emitting means and the light receiving means and between the first and second cylindrical lenses to block the detection light reflected by the transparent member and to enter the light receiving means. Prevent A shielding unit for sensing apparatus characterized by comprising a. 2. A light emitting means for irradiating the surface of the object to be detected with detection light having an optical axis substantially perpendicular to the surface of the object to be detected, and an optical axis substantially perpendicular to the surface of the object to be detected. In addition, the light receiving means is disposed apart from the surface of the object to be detected by a length different from that of the light emitting means and receives the detection light reflected by the surface of the object to be detected, and is emitted from the light emitting means. A first cylindrical lens for condensing the detected light in a predetermined range on the surface of the object to be detected, and a reflection between the surface of the object to be detected and the light receiving means, and reflecting from the predetermined range on the surface of the object to be detected. A second cylindrical lens that guides light to the light receiving means, and the light emitting means, the light receiving means, and the first and second cylindrical lenses provided between the object to be detected and the first and second cylindrical lenses. To prevent dust from entering Is provided between the plate-shaped transparent member and the light-emitting means and the light-receiving means and between the first and second cylindrical lenses to block the detection light reflected by the transparent member and prevent the light from entering the light-receiving means. A detection device, comprising: a shielding unit for preventing. 3. A first light emitting means for irradiating the surface of the object to be detected with the first detection light, and a first light receiving means for receiving the first detection light reflected by the surface of the object to be detected. A first light emitting side cylindrical lens for condensing the first detection light emitted from the first light emitting means in a predetermined range on the surface of the object to be detected, the surface of the object to be detected and the first light receiving A first light receiving side cylindrical lens which is provided between the means and guides the first detection light reflected in a predetermined range on the surface of the object to be detected to the light receiving means; and the first lens facing the surface of the object to be detected. Second light emitting means for irradiating the second detection light having a wavelength different from that of the detection light, second light receiving means for receiving the second detection light reflected on the surface of the object to be detected, and the second light emitting means. The second detection light which is emitted from the light emitting means is condensed onto a predetermined range on the surface of the object to be detected. A light-side cylindrical lens, which is provided between the surface of the object to be detected and the second light receiving means, and which guides second detection light reflected in a predetermined range on the surface of the object to be detected to the second light receiving means. No. 2 light receiving side cylindrical lens, and the first and second light emitting means, the light receiving means, the first and second light emitting means provided between the object to be detected and the first and second light emitting side and light receiving side cylindrical lenses. A plate-shaped transparent member for preventing dust from entering the second light emitting side and light receiving side cylindrical lenses, between the first light emitting means and the first light receiving means, and the first light emitting side, light receiving side. A first shielding portion provided between the side cylindrical lenses to shield the first detection light reflected by the transparent member and prevent the first detection light from entering the first light receiving means; the second light emitting means; and the second light emitting means. Between the light receiving means of the And a second shielding portion which is provided between the light emitting side and the light receiving side cylindrical lenses and shields the second detection light reflected by the transparent member to prevent the second detection light from entering the second light receiving means. A detection device characterized by. 4. A transporting means for transporting a paper sheet along a predetermined transport path, and a detecting device which is arranged so as to face the transport path and optically detects the surface of the paper sheet. The detecting device includes a light emitting means for irradiating the surface of the paper sheet with detection light, a light receiving means for receiving the detection light reflected by the surface of the paper sheet, and the light emitting means. A first cylindrical lens for condensing the detection light in a predetermined range on the surface of the paper sheet and a light receiving means provided between the surface of the paper sheet and the light receiving means are provided for reflecting light from the predetermined range of the surface of the paper sheet. A second cylindrical lens guided to the light receiving means, dust provided to the light emitting means, the light receiving means, the first and second cylindrical lenses provided between the paper sheet and the first and second cylindrical lenses. Plate-shaped transparent member to prevent the entry of A shielding portion which is provided between the light emitting means and the light receiving means and between the first and second cylindrical lenses and which shields the detection light reflected by the transparent member and prevents the detection light from entering the light receiving means. A paper sheet discriminating apparatus characterized by the above. 5. Conveying means for conveying the paper sheet along a predetermined conveying path, and a detecting device which is arranged so as to face the conveying path and optically detects the surface of the paper sheet. The detecting device has an optical axis that is substantially perpendicular to the surface of the paper sheet, and emits detection light toward the surface of the paper sheet; A light receiving means which has a substantially vertical optical axis and is spaced apart from the conveying path by a distance different from that of the light emitting means, and which receives the detection light reflected on the surface of the paper sheet, and the light emitting means. The first cylindrical lens for condensing the detection light emitted from the paper sheet in a predetermined range on the surface of the paper sheet, and the first lens provided between the surface of the paper sheet and the light receiving means. A second cylindrical lens for guiding reflected light of the light to the light receiving means, and the paper sheet A light emitting means, a light receiving means, a plate-like transparent member provided between the first and second cylindrical lenses to prevent dust from entering the first and second cylindrical lenses, the light emitting means and the light receiving means. And a shielding unit that is provided between the first and second cylindrical lenses and that shields the detection light reflected by the transparent member and prevents the detection light from entering the light receiving unit. A paper type discriminating device. 6. The light emitting means and the light receiving means are arranged side by side in a direction orthogonal to the paper sheet conveying direction, and the first and second cylindrical lenses are arranged in the paper sheet conveying direction. 6. The paper sheet discriminating apparatus according to claim 4 or 5, each having a central axis extending in a direction orthogonal to each other.