JP3570554B2 - Optical information reader - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical information reading device that optically reads a bar code or the like, and more particularly, to a structure of an optical information reading device.
[0002]
[Prior art]
For example, an optical information reading device is installed beside a transport line of an object, and a bar code (to be read) attached or printed on the surface of an object that is transported and moved along the line is read, and the read bar code is used. It is well known to identify a moving object.
[0003]
As such an optical information reading device, a laser beam irradiating unit that scans and irradiates a bar code with a laser beam, receives diffused reflected light from the bar code by the irradiating laser beam, and outputs a voltage signal corresponding to the amount of received light. It mainly has a signal processing circuit section such as a light receiving section for outputting, analog signal processing for amplifying and binarizing a voltage signal from the light receiving section, and a digital signal processing for inputting a binary signal and decoding a bar code. There is a configuration in which constituent components are housed in a rectangular parallelepiped housing provided with a window through which a laser beam to be irradiated and received is transmitted.
[0004]
In this case, the housing has a fixed portion, such as an uneven portion, for positioning and fixing components constituting each portion inside the housing, and positions and arranges each component in accordance with the fixed portion, and inserts a tool or the like. Then, for example, it is screwed and fixed.
[0005]
[Problems to be solved by the invention]
However, the structure for positioning and fixing the components of the optical information reading device to the fixed portion formed on the housing requires a space for inserting a tool or the like, and further reduces the size of the optical information reading device. There is a problem that it is difficult to achieve.
[0006]
The present invention has been made in view of such a problem, and reduces unnecessary space that is not required at the time of use, increases the arrangement density of components constituting each unit of the optical information reading device in a housing, and reduces the size. It is an object of the present invention to provide an optical information reading device having the above configuration.
[0007]
[Means for Solving the Problems]
The present invention according to claim 1, a laser light irradiation unit that scans and irradiates a laser beam to the object to be read, a light receiving unit that receives reflected light from the object to be read of the laser light irradiated by the laser light irradiation unit, An optical information reading device comprising an analog signal processing unit and a digital signal processing unit for processing a signal of a light receiving unit, wherein the optical information reading device has a light transmission window for transmitting irradiation light from the laser light irradiation unit and reflection light from a reading target. A housing, formed with circuit parts of the analog signal processing unit for processing signals of the laser light irradiation unit and the light receiving unit, and a circuit board for analog signal processing provided on a bottom surface side in the housing; A circuit component of the digital signal processing unit for inputting a signal from a processing unit and decoding a reading target is formed, and a digital signal processing circuit board provided on an upper surface side in the housing; A motor board that forms the laser light irradiation unit provided with a gap that does not interfere with a mounting component on the upper surface of the analog signal processing circuit board provided on the bottom surface while fixing the laser light irradiation unit. A flexible circuit board that electrically and mechanically connects the analog signal processing circuit board and the digital signal processing circuit board, and the analog signal processing circuit board and the digital A signal processing circuit board is bent at the flexible circuit board section to take a position parallel to the motor board, and the light receiving section is arranged on the analog signal processing circuit board and housed in the housing. [0008] characterized by the following
The present invention according to claim 2 is a laser light irradiation unit that scans and irradiates a laser beam to a reading object, a light receiving unit that receives reflected light from the reading object of the laser light irradiated by the laser light irradiation unit, In an optical information reading device including an analog signal processing unit and a digital signal processing unit for processing a signal of a light receiving unit, a substantially rectangular parallelepiped, which transmits the irradiation light from the laser light irradiation unit and the reflection light from the reading target. A housing having a light transmitting window, a circuit component of the analog signal processing unit for amplifying and binarizing the signal of the light receiving unit, and an analog signal processing circuit board provided on a bottom surface side in the housing; A circuit component of the digital signal processing unit for inputting a binary signal from the analog signal processing unit and decoding a read target, and a digital signal processing circuit board provided on an upper surface side in the housing; A motor for fixing the laser beam irradiating portion and forming the laser beam irradiating portion provided on the upper surface of the analog signal processing circuit board provided on the bottom surface side with a gap not interfering with a mounted component A board and a flexible circuit board that electrically and mechanically connects the analog signal processing circuit board, and the analog signal processing circuit board and the digital signal processing circuit board, so as to surround the motor board. Is bent at the flexible circuit board section to take a position parallel to the motor board, and the light receiving section is arranged on the analog signal processing circuit board and housed in the housing. I do.
[0011]
According to a third aspect of the present invention, in the first or second aspect of the present invention, a substrate forming the analog signal processing unit is disposed on a bottom side of the housing with respect to a substrate forming a laser beam irradiation unit. In addition, a substrate constituting the digital signal processing unit is arranged on the upper surface side of the housing.
[0012]
According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the housing includes an upper housing having an open bottom surface and a lower housing forming a bottom portion. Features.
[0013]
According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the analog signal processing unit formed on the analog signal processing circuit board amplifies the signal of the light receiving unit to an appropriate value. It is characterized by comprising a preamplifier circuit and a variable gain amplifier circuit, and a binarization circuit for binarizing the amplified appropriate value.
[0014]
According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the laser light irradiation unit includes a laser diode that emits laser light, a laser light forming module including a lens and a slit, and a motor drive. Circuit, a motor that rotates by driving the motor drive circuit, a polygon mirror that rotates by the rotation of the motor, scans the laser light emitted from the laser light forming module, and a synchronization signal output that outputs a synchronization signal synchronized with the motor rotation position. It is characterized by comprising a part.
[0015]
According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the laser light forming module including the laser diode, the lens, and the slit is fixed to the laser light forming module holder.
[0016]
According to the first to ninth aspects of the present invention, the analog signal processing circuit board and the digital signal processing circuit board are bent by the flexible circuit board section and housed in the housing so as to surround the laser beam irradiation section. It is possible to reduce unnecessary space that is not required at the time of use, increase the arrangement density of components constituting each unit of the optical information reading device in the housing, and reduce the size of the device body.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an assembled perspective view of an optical information reading apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a laser beam irradiation unit, FIG. 3 is a plan view of a circuit board, and FIG. FIG. 5 is an enlarged sectional view of a blocking mechanism, FIG. 5 is a schematic sectional view showing the structure of an optical information reading device according to another embodiment, FIG. 6 is an explanatory diagram of the structure of the optical information reading device of FIG. 5, and FIG. FIG. 1 is a block diagram schematically illustrating an overall circuit configuration of an optical information reading device according to an embodiment of the present invention.
[0018]
First, the overall circuit configuration of the optical information reading apparatus according to the embodiment will be described with reference to FIG. The optical information reading apparatus includes a laser beam irradiating unit 1 that scans and irradiates a bar code 8 with a laser beam, and a light receiving unit 2 that receives light reflected from the bar code 8 and outputs a voltage signal corresponding to the amount of received light. And an analog signal processing unit 3 for amplifying and binarizing the voltage signal of the light receiving unit 2, and inputting the binary signal of the analog signal processing unit 3 to decode a bar code and form a control signal for each unit. A digital signal processing unit 4 and an external interface unit 5 for exchanging the digital signal processing unit 4 with an external device (5a is an interface for communication, 5b is an interface for input / output of timing signals, reading OK, NG, etc.) , An operation unit 6 having a test switch 6a and an LED display unit 6b for displaying processing results and the like, and an EEPROM 7 for storing setting data and the like.
[0019]
The laser light irradiation unit 1 includes a laser driving circuit 1a, a laser diode 1b that emits laser light by driving the laser driving circuit 1a, a lens 1c, and a slit 1d. A motor drive circuit 1e, a motor (not shown) rotated by the drive of the motor drive circuit 1e, and a polygon mirror 1f consisting of eight surfaces that rotate by the rotation of the motor and scan the laser light emitted from the LD module 1A, and control the scanning angle. And a synchronizing signal output unit 1g for outputting a synchronizing signal synchronized with the rotation position of the motor.
[0020]
In addition, the synchronization signal of the motor detects the scanning light directly by the photodiode, detects the corner of the polygon mirror 1f by the photo interrupter, and detects the change of the magnetic flux due to the rotation of the magnet used for the rotation in the motor rotor. Detection by coil or Hall element, change of magnetic flux by rotation of magnet embedded separately from motor rotor part by rotation of Hall element, or optical marking on motor rotor part, detection by photo interrupter, etc. However, in this embodiment, in order to further reduce the size of the optical information reading device, detection is performed using a magnet embedded in the motor rotor.
[0021]
The light receiving section 2 scans the bar code 8 and receives reflected light of the emitted laser light. The received reflected light has a light amount corresponding to the brightness of the bar code 8, and the light receiving section 2 outputs a voltage signal corresponding to the light amount. That is, when scanning is performed once from right to left as shown in the figure, a reflected light amount corresponding to the lightness and darkness of the bar code 8 is sequentially received from the start of the scanning, and a voltage signal corresponding to this light amount, for example, in the case of bright, a high darkness is detected. In this case, a low voltage signal is output, and a voltage signal corresponding to the bar code 8 is obtained at the end of the scan.
[0022]
A voltage signal corresponding to the amount of light received by the light receiving unit 2 is sent to an analog signal processing unit 3 where the voltage processing unit includes a preamplifier circuit 3a, a variable gain amplifier circuit, and an amplifier circuit whose gain can be set. The signal is amplified to an appropriate value that can be binarized via 3b, the output voltage signal of the amplification processing unit 3b amplified to the appropriate value is binarized by a binarization circuit 3c, and sent to the digital signal processing unit 4.
[0023]
The digital signal processing unit 4 controls each unit such as controlling the blinking of the laser diode 1b by inputting a synchronization signal of the motor, exchanges commands and data with external devices, and writes and reads setting data to and from the EEPROM 7. , Changing and setting the resistance value of the digital potentiometer of the analog signal processing unit 3 (adjusting the amplification factor of each amplifier circuit), and inputting the binarized signal of the binarizing circuit 3c based on the signal. The bar code is decoded, the result is transferred to an external device via the interface unit 5, and displayed on the LED display unit 6b.
[0024]
For example, when a signal corresponding to the barcode 7 cannot be obtained in a preset scanning time, an NG signal indicating that the barcode 7 is not properly read is displayed on the LED display unit 6b, and NG output is performed from the interface 5a. When an NG command or the like is transferred from the interface 5b to an external device and decoded, an OK signal for reading the bar code 7 is displayed on the LED display unit 6b, an OK output is performed from the interface 5a, and bar code data and the like are transmitted from the interface 5b. Transfer to an external device.
[0025]
In the optical information reading device configured as described above, when power is supplied to the optical information reading device, the motor driving circuit 1e is driven, the motor rotates, and the polygon mirror 1f rotates. The digital signal processing unit 4 inputs a motor synchronization signal, and turns on the laser drive circuit 1a when a predetermined position on one surface of the polygon mirror 1f becomes a reflection position of laser light (a scanning start point on that surface). A signal is sent to turn on the laser diode 1b, and when it reaches a predetermined position where the reflection on that surface ends (scanning end point on that surface), a turn-off signal is sent to the laser drive circuit 1a to turn off the laser diode 1b.
[0026]
That is, a turn-on / off signal of the light emitting diode 1b is formed based on the synchronization signal of the motor, and one scanning laser beam that crosses the bar code 7 on one surface of the polygon mirror 1f is formed. Is set to 60 degrees.
[0027]
The light receiving unit 2 receives the diffuse reflection light of the laser light irradiated according to the scanning on the bar code 8, converts the light into a voltage signal having a magnitude corresponding to the received light amount, and outputs the voltage signal. The voltage signal is sent to the analog signal processing unit 3, where it is amplified to an appropriate value via the preamplifier circuit 3a and the variable gain amplifier circuit 3b, binarized by the binarization circuit 3c, and sent to the digital signal processing unit 4. . The digital signal processor 4 decodes the barcode 8 by determining that the signal corresponds to the barcode 8 when the two scans normally coincide with each other.
[0028]
The signal processing circuit section including the laser beam irradiating section 1, the light receiving section 2, the analog signal processing section 3, the digital signal processing section 4, the interface section 5, and the EEPROM 7 constituting the optical information reading apparatus has a light transmitting window. And housed in a housing having In the optical information reading apparatus according to this embodiment, as shown in FIG. 2, a laser beam irradiating unit 1 includes a motor 14 having a polygon mirror 1f fixed to a rotating shaft on a motor substrate 11 and an LD having an LD module 1A fixed thereto. The module holder 13 is fixed. The LD module 1 </ b> A is formed in a circular or elliptical cross section, and is fixed by fitting both ends in the longitudinal direction to the LD module holder 13.
[0029]
The components constituting the signal processing circuit unit are mounted on a printed circuit board (circuit board). The circuit board is divided into five circuit boards 21a to 21e, as shown in FIG. It is electrically and mechanically connected by the flexible circuit board 22 so as to be located on the side, the rear side, the left and right sides, and the top side. For example, the circuit components of the analog signal processing unit 3 are provided on the circuit board 21a located on the bottom side, the circuit components of the digital signal processing unit 4 are provided on the circuit board 21c located on the top side, and the circuit board 21b located on the rear side. Has an electric wire connection portion.
[0030]
FIG. 1 is an assembly view of the optical information reading device. When the components are mounted on the circuit boards 21a to 21e shown in FIG. 3, the LD module 1A and the polygon mirror 1f shown in FIG. The fixed motor board 11 is fixed, the cable 23 to which the bush 24 is fixed is connected, and each of the circuit boards 21b to 21d is bent at the flexible circuit board 22 so as to surround the LD module 1A and the polygon mirror 1f. By connecting to the LD module 1A, the apparatus main body 25 is made compact.
[0031]
The compacted device body 25 is fitted and fixed to a resin chassis (frame body) 27 opened so that components can be observed and operated from all directions, and the light receiving element module 2 is fixed to the front surface thereof. The frame 26 is fitted and fixed. The frame 26 to which the light receiving element module 2 is fixed has a space 26b through which the laser light is transmitted, and a window through which the reflected light is transmitted is formed under the frame 26. The light receiving element module 2 such as a photodiode is placed inside the window. It is fixed. A mechanism 26a for blocking disturbance light and disturbance electromagnetic waves is disposed in the window.
[0032]
In this embodiment, as shown in the enlarged view of FIG. 4, a mechanism 26a for blocking disturbance light and disturbance electromagnetic waves is formed by alternately stacking a plurality of transparent thin silicon sheets 26b1 and black thin silicon sheets 26b2, The louver 26b is formed by cutting the louver 26b having a small gap between the transparent portion and the non-transparent portion formed by cutting to a thickness, and an electromagnetic shield 26c made of a light-transmitting conductive film is provided to cover the louver 26b. Note that the electromagnetic shield 26c may be either the front surface or the rear surface of the louver 26b.
[0033]
That is, by reducing the distance between the transparent portion and the non-transparent portion of the louver 26b, the light path that passes through the inside of the louver 26b is shortened, so that the disturbance from the oblique direction to the incident light path direction of the reflected light to be received. Light incidence is blocked. As a result, the space required to block disturbance light can be reduced. In this case, since the louver 26b is an insulator, the louver 26b blocks disturbance light, but may transmit an electromagnetic wave and cause a malfunction, so that the light-transmitting conductive film 26c is used to block the electromagnetic wave. The front surface of the louver 26b is covered. When the louver 26b is formed of a conductive member or coated with a conductive member, it goes without saying that the conductive film 26c need not be provided. The entire outer peripheral surface of the frame 26 is electromagnetically shielded by vapor deposition with a conductive metal such as nickel.
[0034]
Reference numeral 28 denotes a housing which forms an upper portion, a window 28a for transmitting laser light irradiation and reflected light is formed on the front surface thereof, and a triangular opening 28b for fixing the bush 24 fixed to the cable 23 is formed on a side surface thereof. An opening 28c for mounting the key top 35 is formed on the opposite side surface opposite to the above, and the bottom surface is open.
[0035]
A window glass 29 is fitted into the window 28a, and insulating sheets 31 and 32 are attached inside the window glass 29 and inside the rear surface of the upper housing 28. Reference numeral 34 denotes a bottom housing, on which an insulating sheet 33 is laid under the light receiving element module 2, a frame 27 to which a frame 26 to which the device main body 25 and the light receiving element module 2 are mounted is placed, and the upper housing 28 is mounted. Cover and fix with screws 36. That is, after fixing each component constituting the apparatus main body to the frame 27, the frame 27 is configured to be fitted and stored in the housing 28.
[0036]
In the structure of the optical information reading apparatus according to the above embodiment, the housing formed by the upper housing 28 and the bottom housing 34 is formed in a substantially rectangular parallelepiped shape, and the laser light emitted from the laser light irradiation unit 1 Is configured to emit light from the window 28a formed in the front of the housing and irradiate the bar code 8 with the bar code 8. However, with such a configuration, the wide side surface of the substantially rectangular parallelepiped housing, that is, the bottom surface of the above-described embodiment is used as the normal installation surface, and a large installation space is required. In order to reduce the installation space, for example, a light transmission window is formed on the upper surface of the housing, a mirror is installed in the housing, and the laser light emitted from the laser light irradiation unit 1 is bent by the mirror, and In some cases, light is emitted from the light transmission window formed on the upper surface, and the narrow side surface of the substantially rectangular parallelepiped housing is used as the installation surface.
[0037]
FIG. 5 schematically shows the structure of the optical information reading apparatus according to the embodiment in this case. In this figure, 41 is a housing, 42 is a light transmitting window, 43 is a polygon mirror, 44 is a mirror, 45 Is a light receiving section, and 46 is a mechanism for blocking disturbance light and disturbance electromagnetic waves. The light transmitting window 42 is inclined with respect to a surface parallel to the optical axis of the laser beam scanned by the polygon mirror 43, that is, the upper surface, that is, the end portion 41 a of the housing 41 on the side where the mirror 44 is located. Is formed to be smaller than the height of the end 41b of the housing 41 opposed thereto.
[0038]
That is, in order to avoid receiving the specularly reflected light from the bar code (the amount of reflected light is too large), the bar code is irradiated with laser light from a direction inclined approximately 15 degrees with respect to the direction perpendicular to the bar code. When the light transmission window 42 is formed flush with the upper surface of the housing formed in a rectangular parallelepiped, as shown in FIG. 6, the length L1 of the housing 41A is long, but the size is reduced by inclining the light transmission window 42. L can be shortened by d. Note that the dotted arrows shown in FIG. 6 indicate the width of the raster when raster scanning is performed, and the width of the raster is ensured even if the size of the housing is shortened. That is, the dimensions of the housing are shortened while maintaining the width of the raster.
[0039]
The mechanism 46 for blocking disturbance light and disturbance electromagnetic wave in this embodiment is formed in the same manner as the mechanism 26a for blocking disturbance light and disturbance electromagnetic wave in the above-described embodiment, but the transparent member and the non-transparent member are laminated. They are stacked diagonally so as to be parallel to the incident light. In addition, since the laser beam scanned by the polygon mirror 43 is bent by the mirror 44, the scanning width on the surface of the light transmitting window 42 (in the direction perpendicular to the paper surface shown in FIG. 6) is widened. Can read near barcodes.
[0040]
【The invention's effect】
As described in detail above, according to the present invention, an analog signal processing circuit in which circuit components of an analog signal processing unit that processes signals of a laser beam irradiation unit and a light receiving unit that receives reflected light from a reading target is formed The board is electrically and mechanically connected by a flexible circuit board to a digital signal processing circuit board on which a signal from the analog signal processing section is inputted and a circuit component of the digital signal processing section for decoding a reading object is formed. Since the circuit board for analog signal processing and the circuit board for digital signal processing are folded by the flexible circuit board section and housed in the housing so as to surround the laser beam irradiation section, unnecessary space not required during use can be reduced. Further, it is possible to provide a more compact optical information reading device by increasing the arrangement density of components constituting each unit of the optical information reading device in the housing.
[Brief description of the drawings]
FIG. 1 is an assembled perspective view of an optical information reading device according to an embodiment of the present invention.
FIG. 2 is a perspective view of a laser beam irradiation unit of the optical information reading device according to the embodiment of the present invention.
FIG. 3 is a plan view of a circuit board of the optical information reading device according to the embodiment of the present invention.
FIG. 4 is an enlarged sectional view of a mechanism for blocking disturbance light and disturbance electromagnetic waves of the optical information reading apparatus according to the embodiment of the present invention.
FIG. 5 is a schematic sectional view showing a structure of an optical information reading device according to another embodiment of the present invention.
6 is an explanatory diagram of a structure of the optical information reading device shown in FIG.
FIG. 7 is a block diagram showing the overall circuit configuration of the optical information reading device according to the embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 laser light irradiation section 1A LD module 1a laser drive circuit 1b laser diode 1c lens 1d slit 1f polygon mirror 2 light receiving section 3 analog signal processing section 3b variable gain amplifying means 3c binarization circuit 4 digital signal processing section 5 interface section 6 Operation unit 7 EEPROM
8 Bar Code 11 Motor Board 13 LD Module Holder 14 Motor 21a to 21e Circuit Board 22 Flexible Circuit Board 23 Cable 24 Bush 25 Device Body 26 Frame 26a Disturbance Light and Disturbance Electromagnetic Wave Blocking Mechanism 26b Louver 26c Transparent Conductive Film 27 Frame Body 28 Upper housing 28a Light transmitting window 28b Bush fixing opening 34 Bottom housing 41 Housing 42 Light transmitting window 43 Polygon mirror 44 Mirror 45 Light receiving unit 46 Disturbance light and disturbance electromagnetic wave blocking mechanism

Claims (7)

A laser beam irradiating unit that scans and irradiates a laser beam to the object to be read, a light receiving unit that receives reflected light from the object to be read of the laser beam irradiated by the laser beam irradiating unit, and an analog signal that processes a signal of the light receiving unit In an optical information reading device including a processing unit and a digital signal processing unit, a housing having a light transmission window that transmits irradiation light from the laser light irradiation unit and reflection light from a reading target, and the laser light irradiation unit and A circuit component of the analog signal processing unit that processes the signal of the light receiving unit is formed, and a circuit board for analog signal processing provided on a bottom surface side in the housing, and a signal from the analog signal processing unit is input, A circuit component of the digital signal processing unit for decoding a reading object is formed, and a digital signal processing circuit board provided on an upper surface side in the housing and the laser light irradiation unit are fixed. A motor board for forming the laser beam irradiating section provided on the upper surface of the analog signal processing circuit board provided on the bottom side with a gap not interfering with a mounted component; and the analog signal processing circuit. A flexible circuit board for electrically and mechanically connecting the board and the digital signal processing circuit board; and surrounding the motor board, the analog signal processing circuit board and the digital signal processing circuit board. The flexible circuit board is bent at a position parallel to the motor board, and the light receiving unit is arranged on the analog signal processing circuit board and housed in the housing. Optical information reader. A laser beam irradiating unit that scans and irradiates a laser beam to the object to be read, a light receiving unit that receives reflected light from the object to be read of the laser beam irradiated by the laser beam irradiating unit, and an analog signal that processes a signal of the light receiving unit In an optical information reading device comprising a processing unit and a digital signal processing unit, a housing having a substantially rectangular parallelepiped shape and having a light transmission window that transmits irradiation light from the laser light irradiation unit and reflection light from a reading target, A circuit component of the analog signal processing unit for amplifying and binarizing the signal of the light receiving unit is formed, and a circuit board for analog signal processing provided on a bottom surface side in the housing and a signal from the analog signal processing unit. A circuit component of the digital signal processing unit for inputting the digitized signal and decoding a reading target is formed, a digital signal processing circuit board provided on an upper surface side in the housing, and the laser light irradiation unit A motor substrate that forms the laser beam irradiating section fixed and provided with a gap on the upper surface of the analog signal processing circuit board provided on the bottom surface side so as not to interfere with a mounted component; and A flexible circuit board that electrically and mechanically connects the circuit board to the circuit board, wherein the analog signal processing circuit board and the digital signal processing circuit board are bent at the flexible circuit board portion so as to surround the motor board. An optical information reading device, wherein the optical information reading device is positioned parallel to the motor substrate, and the light receiving unit is disposed on the analog signal processing circuit substrate and housed in the housing. The optical information reading device according to claim 1 , wherein the housing comprises an upper housing having an open bottom surface and a lower housing forming a bottom. An analog signal processing unit formed on the analog signal processing circuit board; a preamplifier circuit and a variable gain amplifier circuit for amplifying a signal of the light receiving unit to an appropriate value; and a binarizing the amplified appropriate value. 3. The optical information reading device according to claim 1 , comprising a binarization circuit. A laser beam forming module including a laser diode that emits laser light, a lens, and a slit, a polygon mirror that scans laser light emitted from the laser light forming module, and a motor that drives the polygon mirror The optical information reading device according to claim 1 , comprising: A laser light emitting module including a laser diode that emits laser light, a lens and a slit, a motor driving circuit, a motor that is driven by driving a motor driving circuit, and a motor that is rotated by the rotation of the motor to form the laser light. 3. The optical information reading device according to claim 1 , further comprising a polygon mirror that scans laser light emitted from the module, and a synchronization signal output unit that outputs a synchronization signal synchronized with a motor rotation position. The optical information reading device according to claim 6 , wherein the laser light forming module including the laser diode, the lens, and the slit is fixed to a laser light forming module holder.

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