JP2012068731A - Optical line sensor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable, as a second light receiving element can measure a total luminous energy reflected or transmitted by a medium S and entering into a sensor module, accurate measurement of the ratio of optical intensity transmitted by visible light color filters with reference to the total luminous energy entering into the sensor module.SOLUTION: An optical line sensor device has: a light source that irradiates a medium S, such as a bank note, with light of a prescribed wavelength band; a sensor module 14 of a one-dimensional array; and a signal processor 27 that processes light detection signals from the sensor module 14. The sensor module 14 contains a first light receiving element and a second light receiving element in each of the pixels of the module, the first light receiving element is provided with visible light color filters R, G and B differing from one another in transmission characteristic with respect to visible light, and the second light receiving element is either provided with a transparent filter W or with no filter. The signal processor 27 discriminates color information from the medium S either transmitted or reflected by the medium S and entering into the pixels on the basis of luminous energy detected by the first light receiving element and calculates the total luminous energy entering into the pixels on the basis of luminous energy detected by the second light receiving element.

Description

  The present invention relates to an optical line sensor device, and more particularly to a discrimination-use optical line sensor device for the purpose of discriminating securities and banknotes.

With recent remarkable improvements in printing technology and copying technology, counterfeiting of banknotes, securities, etc. is becoming more and more sophisticated, and to accurately identify and eliminate these in order to maintain the national social order Is important. In particular, in a device that handles banknotes such as ATMs and banknote processors, there is a strong demand for a higher-speed and higher-performance discrimination system for authenticity determination purposes.
As a method for discriminating these bills and securities, pattern identification using an optical line sensor device has been used for some time.

  The optical line sensor device includes a reduction optical line sensor device combining a reduction lens, a mirror, and a CCD, and a contact type optical line sensor device using an equal magnification optical system such as a selfoc lens, and the reduction optical system is a system. The unit price is low, the resolution can be adjusted easily, and there is an advantage that the depth of focus is deep. On the other hand, there are disadvantages that the volume of the sensor is large and there are many troubles due to dust and foreign matter. Therefore, a contact type optical line sensor device that is easy to maintain has been widely used recently.

As optical line sensor devices become more sophisticated and sensor signal processing technology advances, it is preferable to improve discrimination accuracy by reading images from the front, back, and transmission directions of the target medium. It is coming.
In addition, the optical line sensor device irradiates light of a wavelength including ultraviolet and infrared from the light source, as well as the human visible light region, color information by visible light irradiation, and medium information by ultraviolet light irradiation. What reads an image in at least two or more wavelength bands, such as fluorescence color information and grayscale information by infrared light, has become the mainstream recently.

  For this reason, the current optical line sensor device for discrimination is equipped with a plurality of types of LEDs so that the mounted light source unit can emit a wide wavelength range from ultraviolet light to visible light and infrared light. The target medium is run at high speed, and these LEDs are sequentially switched to emit light, and the respective light detection signals are collected in the light receiving unit to obtain image data of each condition, and authenticity determination is performed based on this. .

JP 2004-355262 A

According to the conventional optical line sensor device, the target medium is run at high speed and the LEDs are sequentially switched to emit light, but if all the color information of the target medium can be detected by one irradiation of the LED, the wavelength of the light source Reducing the number of switching is preferable because the burden of signal processing can be reduced and the resolution in the sub-scanning direction when reading the medium can be increased.
Further, when obtaining the color information by irradiation with visible light, if the total amount of the irradiated visible light is known, more accurate color information of the medium can be known.

Also, when obtaining the fluorescent color information of the medium by irradiation with ultraviolet light, more accurate fluorescent color information of the medium can be known if the total amount of light of the irradiated ultraviolet light is known.
Accordingly, an object of the present invention is to accurately measure image information of a medium required for discrimination in developing an optical line sensor device having an advanced discrimination function such as securities and banknotes, and to output high-speed and high-resolution. It is possible to provide an optical line sensor device capable of improving the accuracy of discrimination.

  An optical line sensor device of the present invention includes a light source that irradiates a moving medium with light in a predetermined wavelength band, a light receiving unit that includes a sensor module in which a light receiving element is arranged, and a signal that processes a light detection signal of the light receiving unit. A processing unit, wherein the light receiving element includes a first light receiving element and a second light receiving element, and the sensor module includes the first light receiving element and the second light receiving element for each pixel. The first light receiving element is composed of two or more types of light receiving elements each having a visible light color filter having a transmission characteristic different from that of visible light, and the second light receiving element is A light receiving element having a transparent filter or no filter, wherein the signal processing unit transmits or reflects the medium, and color information of the medium based on each light intensity detected by the first light receiving element of the sensor module The And another, the second based on the detected light amount by the light receiving element, and calculates the overall amount of light entering the pixel.

  With this configuration, the reflected light amount or transmitted light amount of the medium that has passed through each visible light color filter can be output by the first light receiving element. Therefore, it is possible to know the color information of the moving medium with a single irradiation of the light source light. In addition, the second light receiving element can reflect or transmit the medium and measure the total amount of light entering the sensor module. It can be measured accurately.

  The light source includes a light source capable of irradiating a medium with ultraviolet light having a wavelength of 300 nm to 400 nm, the visible light color filter is substantially opaque to the ultraviolet light, and the transparent filter is adapted to the ultraviolet light. The signal processing unit obtains ultraviolet light intensity based on the amount of light detected by the second light receiving element of the light receiving unit, and is detected by the first light receiving element with respect to the ultraviolet light intensity. It is also possible to read out the fluorescence color information. This improves detection sensitivity by reading out fluorescence as color-specific information, including colors that are difficult to detect, such as red, where brightness is low, compared to conventional sensors that read the amount of fluorescence in the medium using only light and dark outputs. Can be made. Further, the ratio of the light intensity transmitted through each visible light color filter with the total amount of ultraviolet light entering the sensor module as a reference can be obtained, and the color information of the medium can be accurately output.

  The light source includes a light source capable of irradiating a medium with infrared light having a wavelength of 800 nm or more, the visible light color filter is substantially transparent to the infrared light, and the transparent filter is the infrared light It is substantially transparent to light, and the signal processing unit reads out the intensity of infrared light detected by the first light receiving element and the second light receiving element of the light receiving unit. With this configuration, since both the visible light color filter and the transparent filter are substantially transparent to infrared light, one pixel is formed using both the first light receiving element and the second light receiving element. The infrared image of the medium can be read out using the whole. Therefore, it is possible to read out continuous image information on the reading surface of the medium with high sensitivity, which is effective for discriminating the medium base number and minute patterns.

  As described above, according to the present invention, it is possible to detect accurate color information of a medium, which has been regarded as a difficult point in the past, and it is also possible to detect color information of a fluorescent material when irradiated with ultraviolet light.

It is sectional drawing which shows the optical line sensor apparatus which detects the image of media, such as securities and a banknote. It is a schematic diagram which shows the element arrangement | sequence of a sensor module. It is the graph which plotted the light intensity which permeate | transmitted each filter of R, G, B, and transparency (W) detected with each light receiving element of a sensor module, and the light intensity without a filter on the logarithmic scale. It is a figure for demonstrating the timing which detects the fluorescence emitted from a medium. It is a figure which shows the example of an array of the light receiving element and filter in a sensor module.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view showing an optical line sensor device for detecting an image of securities, banknotes, etc. (hereinafter referred to as “medium S”), and a banknote transport path 11 for transporting the medium S linearly in the x direction. It has the detection units 12 and 13 opposingly arranged on both sides on both sides. The banknote conveyance path 11 conveys the medium S straightly in a posture along the conveyance direction x.

One detection unit 12 has a dimension in the length direction (y direction in FIG. 1) that is considerably larger than the dimension in the thickness direction (z direction in FIG. 1) and the dimension in the width direction (x direction in FIG. 1). It has an elongated shape. The detection unit 12 includes an elongated box-shaped casing 16 having an opening in the lower direction, an elongated plate-shaped translucent cover 17 attached to the casing 16 so as to close the opening, and a casing. 16 and a unit main body U housed in 16.
The translucent cover 17 is formed of a transparent material such as glass, and is chamfered so as to be thinner at both ends in the width (x) direction so that the thickness becomes thinner toward the tip side. This chamfering is to prevent the medium S from becoming a hindrance when passing through the detection unit 12. In addition, as the translucent cover 17, you may use the integrally molded resin molded product which minimized the level | step difference of the junction part.

  In the unit main body U, a sensor module (including an image detection sensor such as a CCD and a signal processing unit) 14 is disposed on the opposite side to the translucent cover 17. The sensor module 14 has an elongated shape like the unit body U, and is attached to the housing 16 with its length (y) direction aligned with the length (y) direction of the unit body U. Yes. The sensor module 14 has its image detection direction directed to the translucent cover 17.

  In the unit main body U, a rod lens array 25 having an elongated shape in the length (y) direction is arranged in parallel with the sensor module 14. The rod lens array 25 is a lens element for forming an image of the medium S as an upright image at an equal magnification on the photosensitive surface of the sensor module 14. The rod lens array 25 is attached to the housing 16 in a state where the positions of the unit main body U in the width (x) direction and the length (y) direction are entirely superimposed on the sensor module 14.

  The sensor module 14 sets the detection area (observation line) of the image to be captured via the rod lens array 25 outside the translucent cover 17 by a predetermined distance (this detection area is indicated by R1 in FIG. 1). A line connecting the detection area R1 and the sensor module 14 is parallel to the z-axis. As a matter of course, the detection area R1 is also an elongated area in the length (y) direction, like the unit body U.

With the above configuration, the sensor module 14 can form an image existing in the detection area R <b> 1 set outside the translucent cover 17 on one side of the unit body U via the rod lens array 25. .
Further, in the unit main body U, an elongated light emitter 19 that can irradiate light obliquely toward the detection area R1 is provided along with the rod lens array 25 (the direction of light in FIG. 1). Is indicated by a broken line). The light emitter 19 is attached to the housing 16 in a state parallel to the sensor module 14 and the rod lens array 25 along the length (y) direction of the unit body U.

The light emitter 19 includes a light guide resin 38 made of a transparent material such as an elongated glass having a length substantially equal to or longer than that of the sensor module 14, and a light emitting element 29 made of a semiconductor element that irradiates the light guide resin 38. have.
Further, as shown in FIG. 1, the casing 16 is provided with a reflecting plate portion 34 for guiding light emitted from the light guide resin 38 obliquely downward. Like the unit body U, the reflecting plate portion 34 has an elongated shape in the length (y) direction and has a parallel groove along the length (y) direction. The light emitter 19 is accommodated in the groove. Yes. One side of the groove that accommodates the light emitter 19 spreads in a horn shape as it is separated from the light guide resin 38 in the thickness (−z) direction, but the other surface of the groove is cut horizontally. This is to prevent the irradiation light from the light guide resin 38 from becoming an obstacle when traveling to the detection area R1.

  A plurality of, specifically five, light emitting elements 29 in the light emitter 19 are provided. Each light emitting element 29 includes three light emitting elements (LED elements) 29A to 29C each capable of irradiating light in a desired wavelength region alone, and a light emitting element 29D capable of emitting ultraviolet light having a wavelength of 300 nm to 400 nm, And a light emitting element 29E capable of emitting light having a wavelength of 800 nm or more. Each light emitting element 29A-29E is provided with a predetermined electrode terminal (not shown), and they are connected by wire bonding or the like. The light emitting elements 29A to 29C irradiate light of any three wavelength regions of visible light, ultraviolet light, and infrared light of a plurality of colors corresponding to three primary colors such as red, green, blue (RGB) or cyan, magenta, and yellow, for example. It is possible.

Each of the light emitting elements 29A to 29E can irradiate light in a different wavelength region into the light guide resin 38. For this reason, by selecting an electrode terminal for applying a voltage to each element, the light emitting elements 29A to 29E can be simultaneously applied. Alternatively, the circuit configuration can emit light by switching over time.
The casing 16 is formed with a bottom wall portion 35 for preventing light from the light emitter 19 from leaking to the sensor module 14 inside, and the bottom wall portion 35 has an optical path of the sensor module 14. An opening is formed only in the opening, and the rod lens array 25 is attached to the opening. The reflection plate portion 34 and the bottom wall portion 35 may be integrally formed as shown in FIG.

  The other detection unit 13 is opposed to the detection unit 12 in a posture reversed 180 degrees around an axis along the length (y) direction with the banknote transport path 11 in between. That is, the detection unit 13 is provided with an opening in the upper direction of the elongated box-shaped housing 21, and the translucent cover 22 is attached to the housing 21 so as to close the opening. The detection unit 13 and the detection unit 12 face each other with the main surfaces of the translucent covers 17 and 22 parallel to the banknote transport path 11 with a gap of 1.5 to 3 mm.

  The element arrangement in the housing 21 is provided with a light emitter 23 that irradiates the back surface of the medium S from the bottom to the top in addition to the light emitter 24 having the same configuration as the light emitter 19 described above. It has been. Since the light emitter 23 is disposed relative to the sensor module 14 of the detection unit 12, the light emitted from the light emitter 23 and transmitted through the medium S passes through the rod lens array 25 and enters the sensor module 14. The Similarly to the light emitter 19 described above, each of the light emitters 23 includes five light emitting elements that can individually irradiate light in a desired wavelength region.

  With this configuration, the sensor module 14 of the upper detection unit 12 shown in FIG. 1 can detect a transmission image in the detection area R1 of the lower detection unit 13 shown in FIG. Further, the sensor module 14 of the upper detection unit 12 shown in FIG. 1 can detect a reflected image irradiated from the upper light emitter 19 shown in FIG. 1 and reflected by the detection area R1, and the lower side shown in FIG. The sensor module 15 of the detection unit 13 can detect the reflected image of the detection area R2 irradiated from the light emitter 23.

The light emitter 19 and the light emitter 23 are controlled to emit light by temporal switching so that the transmitted image and the reflected image do not enter the sensor module 14 at the same time.
With the above configuration, a transmission image or a reflection image of an object irradiated through the light-transmitting covers 17 and 22 on the surface of the housing is applied to the surface of the sensor modules 14 and 15 through the rod lens arrays 25 and 26 at the same magnification. Formed as a standing image.

  Next, FIG. 2 is a front view showing the element arrangement of the sensor modules 14 and 15, which is characteristic of the present invention. The sensor modules 14 and 15 are sensor ICs in which a plurality of light receiving elements (each composed of a photodiode, a phototransistor, etc.) arranged linearly in the y direction, a signal processing unit 27 and a driver unit 31 are integrated. A chip is arranged, each light receiving element is covered with a color filter, and this is mounted on a substrate. The driver unit 31 is a circuit part that generates and supplies a bias current for driving the light receiving element, and the signal processing unit 27 is a circuit part that reads and processes a light detection signal of the light receiving element. Although the kind of light receiving element is not limited, for example, a silicon PN diode or a PIN diode is used.

  While the medium S moves in the x direction, the signal processing unit 27 exposes the light receiving elements arranged in a line to set an observation line having a predetermined width along the y direction on the surface of the medium S. Can do. An exposure time for reading the line information of the bill (referred to as an optical reading time) can be arbitrarily set according to the intensity of the light source, the wavelength sensitivity of the sensor, and the like. For example, the moving speed of the medium S in the x direction is 1500 mm to 2000 mm / second in an ATM or banknote processing machine, and if the optical reading time is 0.5 to 1.0 milliseconds, the width of the observation line in the x direction is 0.75 to 2 mm.

Since the conventional sensor module does not have a color filter, only one color of light / dark information can be read within this optical reading time. Therefore, in order to obtain multicolor information, at least R light, G light, and B light are irradiated while being switched, and the light quantity must be read each time, and the effective observation line width is widened.
In the present embodiment, as shown in FIG. 2, a plurality of, for example, four light receiving elements are arranged in a straight line per pixel of the sensor modules 14 and 15 (a pixel means a spatial unit for reading and processing image data). It consists of In FIG. 2, among the four light receiving elements, the first light receiving element is covered with a red (R) color filter, the second light receiving element is covered with a green (G) color filter, and the third light receiving element is It is covered with a blue (B) color filter. The fourth light receiving element is covered with a transparent (W) filter or is not covered with a filter. The color filters (R, G, B) are generally opaque to ultraviolet light having a wavelength of 300 to 400 nm and transparent to infrared light having a wavelength of 800 nm or more.

  A transparent (W) filter is a “transparent” filter without any coloration. For example, it is desirable to have a light transmittance obtained by adding the light transmittances of all the color filters. For example, it is desirable to have the same light transmittance as this envelope when an envelope is formed by connecting the light transmission band of the R filter, the light transmission band of the G filter, and the light transmission band of the B filter. The material of the film that forms such a “transparent filter” is selected from transparent acrylic resin, cycloolefin resin, silicone resin, and fluorine resin for organic materials, and silicon nitride film and silicon oxide for inorganic materials. Selected from among membranes.

These filter materials are transparent to ultraviolet light of 300 to 400 nm. These filter materials are transparent to infrared light having a wavelength of 800 nm or more.
In addition, in an organic material, since the transparent material containing the ultraviolet light absorber used for a liquid crystal use is not transparent with respect to ultraviolet light, it is not preferable to employ | adopt.
As described above, each of the sensor modules 14 and 15 is provided with a plurality of light receiving elements and a filter for each color covering them in one pixel. It is possible to simultaneously turn on a plurality of light-emitting elements that can be illuminated with a single observation line and output the color information of the medium at one time.

The determining unit 30 compares the transmission image data or the reflection image data of the medium S read by the light receiving element with each of, for example, master data to determine authenticity, denomination, contamination, and the like. -Implemented by a computer executing a program recorded in a predetermined storage medium S such as a ROM or a hard disk.
In FIG. 2, only one element is covered with the same color filter, but two or more light receiving elements may be covered with the same color filter in pairs.

  The light detection signals of the sensor modules 14 and 15 having such a configuration are signals obtained simultaneously from the light detection signals of the respective light receiving elements, and these are input to the signal processing unit 27. The signal processing unit 27 determines the color information of the medium S based on the signal intensity of the light receiving element that has passed through the R, G, and B filters of the sensor modules 14 and 15, and the transparent (W) filter. Based on the signal intensity that passes through or does not pass through the filter, the total amount of light entering the pixel is calculated. Thereby, it is possible to know the accurate light amount of each color signal using the total light amount as the denominator (reference).

The red, blue, and green light emitting elements of the light emitting body 23 were simultaneously turned on, irradiated to the stationary medium S, and the transmitted image was read by the sensor module 14.
FIG. 3 is a graph in which the light intensity transmitted through the R, G, B, and transparent (W) filters detected by each light receiving element of the sensor module 14 and the light intensity without the filter are plotted on a logarithmic scale. is there. The horizontal axis is the wavelength (nm). From this graph, the light intensity transmitted through the transparent (W) filter is equal to the sum of the light intensity transmitted through each color filter, which is also equal to the light intensity without the filter.

Therefore, it is clearly shown that the total amount of light entering the sensor module 14 can be obtained based on the light intensity transmitted through the transparent (W) filter or the light intensity without filter.
The graph of FIG. 3 is based on the result of irradiating the sensor module 14 with a visible light emitter in which red, blue, and green LEDs are mixed. For example, the ultraviolet light in the wavelength range of 300 nm to 400 nm is irradiated. In some cases, the fluorescence, which is visible light, emitted from the medium S is observed. In this case, the transparent (W) filter is selected from the materials described above that are transparent to ultraviolet light. In this way, as shown in FIG. 3, each color filter is opaque to ultraviolet light having a wavelength shorter than 450 nm, whereas the light intensity transmitted through the transparent (W) filter and the absence of the filter The light intensity extends to the ultraviolet region of less than 400 nm.

When the fluorescence emitted from the medium S is observed, the fluorescence can be observed almost simultaneously with the time of irradiation with ultraviolet light. Therefore, visible fluorescence can be observed by irradiating with ultraviolet light within one optical reading time. This is shown in FIG. 4 (the horizontal axis “t” represents time). FIG. 4C shows the optical reading time T in the signal processing unit 27.
The signal processing unit 27 records an optical signal detected through a transparent (W) filter or a light-receiving element without a filter at the timing of irradiation with ultraviolet light, and each color filter (R) within the same optical reading time T. , G, B) is detected for the signal intensity of each light receiving element.

  The signal processing unit 27 passes the light intensity transmitted through the transparent (W) filter or the light intensity without filter to the determination unit 30, and passes the light intensity transmitted through the R, G, and B filters to the determination unit 30. As a result, the determination unit 30 can obtain the light intensity transmitted through each color filter, with the total light amount including the ultraviolet light that is reflected or transmitted through the medium S and enters the sensor module 14 as a reference.

Further, for example, infrared light emitted from the medium S may be observed using an infrared irradiation light emitting element that irradiates infrared light having a wavelength band of 800 nm or more. In this case, not only the transparent (W) filter but also each color filter (R, G, B) transmits infrared light, so that the image formed on the sensor module 14 is light and shade without spatially continuous color information. It becomes only an image.
The conventional sensor module reads the reflected light when the colored light is reflected from the medium S or the transmitted light when it is transmitted through any one of the color filters (R, G, B). For example, a green light emitting element is turned on to read light passing through the color filter (G). In this case, since the reading area on the medium S is limited to the area facing the color filter (G), the images formed on the sensor module 14 are skipped over the other color filters (R, B). It only has information that can be obtained from a flying line that is a predetermined distance away.

  However, if infrared light emitted from the medium S is observed using an infrared irradiation LED that irradiates infrared light, not only the transparent (W) filter but also each color filter (R, G, B) is infrared light. Therefore, the image formed on the sensor module 14 is not an image of a flying line separated by a predetermined distance but an image of a continuous region in the x direction. Therefore, all pixels can be read continuously when reading an infrared light image, information with high spatial resolution can be extracted, and this is effective for medium base number and fine pattern discrimination.

The determination unit 30 can determine the authenticity, denomination, fouling, and the like by comparing the above-described transmission image data and reflection image data on the front and back sides based on the accurate light amount, respectively, with the master data.
Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments. For example, the light receiving elements of the sensor modules 14 and 15 are not necessarily arranged in a line as shown in FIG. 5A, but may be arranged in two or more lines. FIG. 5B is a diagram in which the light receiving elements are arranged 2 × 2 per pixel, and a transparent (W) filter or no filter is provided at one corner (for example, the lower row) of the two rows. An example in which the second light receiving elements are arranged is shown. FIG. 5C shows the light receiving elements arranged in four columns per pixel, and in one of the four columns (for example, the lower column), a transparent (W) filter or no filter is provided. An example in which second light receiving elements are arranged is shown. Even in these cases, an optical signal detected through a transparent (W) filter or a non-filtered light receiving element is recorded in one pixel, and each light receiving element that has passed through each color filter (R, G, B) is recorded. The signal strength can be detected. In addition, various modifications can be made within the scope of the present invention.

12, 13 Detection unit 14, 15 Sensor module 19, 23, 24 Light emitter 27 Signal processing unit 30 Determination unit RGB Visible light color filter S Medium such as securities, bills U Unit body W Transparent filter

Claims (5)

In the optical line sensor device for the purpose of identifying media such as securities, banknotes,
A light source that irradiates a moving medium with light of a predetermined wavelength band, a light receiving unit including a sensor module in which light receiving elements are arranged, and a signal processing unit that processes a light detection signal of the light receiving unit,
The light receiving element has a first light receiving element and a second light receiving element,
The sensor module is an array of the first light receiving element and the second light receiving element for each pixel.
The first light receiving element includes two or more light receiving elements each having a visible light color filter having different transmission characteristics with respect to visible light, and the second light receiving element includes a transparent filter or has no filter. Element,
The signal processing unit transmits or reflects the medium, determines color information of the medium based on each light intensity detected by the first light receiving element of the sensor module, and is detected by the second light receiving element. An optical line sensor device that calculates the total amount of light entering the pixel based on the amount of light. The light source includes a light source capable of irradiating a medium with ultraviolet light having a wavelength of 300 nm to 400 nm,
The visible light color filter is substantially opaque to the ultraviolet light, the transparent filter is substantially transparent to the ultraviolet light, and the signal processing unit is a second light receiving element of the light receiving unit. 2. The optical line sensor device according to claim 1, wherein the ultraviolet light intensity is obtained based on the light amount detected in step 1 and the color information of the fluorescence detected by the first light receiving element is read with respect to the ultraviolet light intensity. The light source includes a light source capable of irradiating a medium with infrared light having a wavelength of 800 nm or more,
The visible light color filter is substantially transparent to the infrared light, the transparent filter is substantially transparent to the infrared light, and the signal processing unit is a first of the light receiving unit. The optical line sensor device according to claim 1 or 2, which reads out intensity information of infrared light detected by the light receiving element and the second light receiving element.   The optical line sensor device according to any one of claims 1 to 3, wherein the sensor module has the light receiving elements arranged in a line.   4. The sensor module according to claim 1, wherein the light receiving elements are arranged in a plurality of rows, and the second light receiving elements are arranged in one of the plurality of rows. 5. The optical line sensor device according to any one of the above.

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