JP2000307266A - Fixing structure of electric cable for optical information reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase waterproof by forming an equal adhesive layer in a fitting section of a bushing, simplify a treatment of wire section inserted in a case, and decreasing space for wires inserted in the case. SOLUTION: A bushing 24 in which an electric cable 23 is inserted and fixed is fitted and fixed to a notch section 28b close to an opening for components insertion formed on a flank wall of a case 28, and the shape of the notch 28b is formed narrower as remote from the opening. An adhesive can be evenly coated on all the connecting face between the notch section 28b and the bushing 24 to suppress dropping of the adhesive after being coated. Covering an electric shield body of the electric cable by the bushing 24 and keeping the length of the electric cable in the case 28 within the distance between the notch section 28b and the cable connection position decreases a bending of the cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a cable for an optical information reader for optically reading a bar code or the like.

[0002]

2. Description of the Related Art For example, an optical information reading device is installed beside a line for transporting an object and reads a bar code (to be read) attached or printed on the surface of the object which is transported and moved along the line. It is well known to identify a moving object by reading a barcode.

[0003] As such an optical information reading apparatus, a laser beam irradiating section for scanning a bar code with a laser beam and irradiating the bar code, receiving diffused reflected light from the bar code by the irradiating laser beam, and responding to the received light amount. It mainly has a signal processing circuit section such as a light receiving section for outputting a voltage signal, an 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 components constituting each unit 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 is provided with a fixing portion such as an uneven portion for positioning and fixing the components constituting each portion inside the housing. Each of the components is positioned and arranged in accordance with the fixing portion. For example, a screw is inserted and fixed. A through hole through which the electric cable is inserted is formed on the side wall of the housing, and a bushing through which the electric cable is inserted is fitted and fixed so as to close the through hole, so that the electric cable is inserted into the housing. ing.

FIG. 7 shows an electric cable mounting structure in such an optical information reader. In this figure, 23 is an electric cable, and 50 is an opening for inserting each part of the optical information reader. Reference numeral 51 denotes a bushing. The electric wire cable 23 has a plurality of insulated wires 23b bundled, and an electric shield body 23a is arranged around its outer periphery to be insulated and covered. The bushing 51 has a U-shaped outer shape, and a fitting concave portion 51a is formed on the outer periphery thereof, and a through hole 51b through which the electric cable 23 is inserted is formed in a flat portion. A notch 50 connected to the opening is provided on the side wall of the housing 50.
a (The notch becomes a through hole when the opening is covered.)
The notch 50a is for fitting and fixing the bushing 51, and the shape thereof is the same as that of the bushing 51.
It is shaped like a letter.

Then, the electric cable 2 is connected to the bushing 51.
The bushing 51 is inserted into the bushing 51, and the fitting recess 51 a is fitted and fitted to the peripheral wall 50 b of the cutout 50 a on the side wall of the housing 50, and the cutout 50 a is closed by the bushing 51.
The electric cable 23 inserted into the housing 50 is stripped of the outer insulating coating to expose the electric shield 23a, and a part of the electric shield 23a is separated to form the electric cable 23b.
Then, the exposed peripheral portion of the electric shield body 23a is covered with an insulating heat-shrinkable tube or tape (not shown). The tip of each electric wire 23b is guided to a connection part (not shown),
It is connected by soldering or the like.

[0007]

Incidentally, there are cases where it is necessary to waterproof the fitting portion between the bushing 51 and the cutout portion 50a of the housing 50. In this case, an adhesive is applied to the peripheral wall 50b of the U-shaped notch 50a that contacts the bushing 51. However, in the U-shaped notch portion 50a, the peripheral wall 50b has a curved portion connecting the vertical portion and the vertical portion, and a complicated movement is required at the tip of the nozzle for discharging the adhesive, and particularly, the vertical portion and the curved portion are not connected to each other. It is extremely difficult to apply evenly to the corners between them, it is even impossible to apply, and even if adhesive is applied to the vertical part, the adhesive after application easily flows down and the adhesive layer There is a problem that it is extremely difficult to uniformly form the entire peripheral wall.

Further, the peripheral portion of the electric shield body 23a inserted into the housing is covered with a heat-shrinkable tube, or a long electric wire is bent to avoid interference with components housed in the housing. It takes much time and effort to process the inserted wires, and the wires inserted into the housing are inevitably long, requiring a large space for housing the wires in the housing, making it difficult to miniaturize the optical information reader. There's a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an even adhesive layer formed on a fitting portion of a bushing, has high waterproofness, and can easily process an electric wire portion inserted into a housing. It is an object of the present invention to provide a mounting structure for an electric cable for an optical information reading device, wherein the space occupied by the electric wire inserted into the housing is reduced.

[0010]

According to a first aspect of the present invention, a notch is formed in a side wall of a housing for housing a component constituting an optical information reading device, the cutout being continuous with an opening for inserting the component. In the mounting structure for an optical information reader wire cable, wherein the bushing that penetrates the wire cable is fitted and fixed in the notch portion, and the wire cable is inserted into the housing, the notch portion corresponds to the opening. It is characterized in that, as it continues, the width decreases as the distance from the opening increases.

According to a second aspect of the present invention, there is provided an electric cable in which a through hole is formed in a side wall of a housing for housing components constituting an optical information reading device, and a plurality of electric wires are bundled in the through hole. In the mounting structure of the optical information reading device wire cable, wherein each wire of the wire cable inserted into the housing is connected to a connector connected to the component, the wire is inserted into the housing. The length of each wire of the wire cable is set to a length corresponding to a different distance from a wire connecting position of the connector at a different distance from the through hole.

According to a third aspect of the present invention, a through hole is formed in a side wall of a housing for housing a component constituting an optical information reading device, and an electric shield is disposed around the through hole. A bushing that penetrates the wire cable formed by insulating coating is fitted and fixed, the wire cable is inserted into the housing, and the wire cable inserted into the housing is connected to a connection portion connected to the component. The bushing is fixed to a distal end of an insulating coating of the electric cable and covers an electric shield of the electric cable.

In the present invention, the shape of the bushing and the notch of the housing to be fitted with the bushing is reduced, for example, in a triangular or arcuate shape, as the distance from the opening increases. When applying the adhesive, the adhesive can be applied evenly to the entire wall surface of the notch while the tip of the nozzle for discharging the adhesive is directed downward, for example, and is fitted and joined to the bushing. Since there is no vertical region on the wall surface of the notch, the downward flow of the adhesive after application is suppressed, and the adhesive layer can be formed almost uniformly on the entire wall surface of the notch.

Further, by covering the electric shield body of the electric cable with the bushing, the electric shield body is drawn out into the housing, and the trouble of covering the peripheral portion of the electric shield body inserted into the housing with a heat shrinkable tube or the like is omitted, and By pulling out the electric shield body into the housing, the electric wires in the housing can be shortened, and the length of the electric wires inserted into the housing is set to a length corresponding to the distance of the connection position, thereby reducing the time and effort required for bending the electric wires. The space occupied by the electric wires can be reduced, and the possibility of interference between the electric wires and the internal components can be eliminated.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mounting structure of an electric cable of an optical information reading device according to an embodiment, FIG. 2 is a side view showing the mounting structure of FIG. 1, and FIG. 3 is an optical information reading device according to the embodiment. FIG. 4 is a perspective view of a laser beam irradiating section, FIG. 5 is a plan view of a circuit board, and FIG. 6 is a block diagram schematically showing an overall circuit configuration of the optical information reading apparatus according to the embodiment. is there.

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. An analog signal processing unit 3 for amplifying and binarizing the voltage signal of the light receiving unit 2;
A digital signal processing unit 4 for inputting the digitized signal to decode the bar code and forming a control signal for each unit, and an external interface unit 5 (5a for communication between the digital signal processing unit 4 and an external device) An interface 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 EEPPOM 7 for storing setting data and the like. It consists of.

The laser beam irradiator 1 includes a laser drive circuit 1a
And a laser light forming module 1A (hereinafter, referred to as an LD module 1A) including a laser diode 1b that emits laser light by driving the laser driving circuit 1a, a lens 1c, and a slit 1d, a motor driving circuit 1e, and a motor driving circuit 1e. And a polygon mirror 1 composed of eight surfaces that rotate by the rotation of the motor and rotate by the rotation of the motor and scan the laser light emitted from the LD module 1A.
f and a synchronizing signal output unit 1g that outputs a synchronizing signal synchronized with the rotational position of the motor necessary for controlling the scanning angle.

The synchronization signal of the motor detects the scanning light directly with a photodiode, detects the corner of the polygon mirror 1f with a photo interrupter, and detects a change in magnetic flux due to rotation of a magnet used for rotation in a motor rotor. Detected by drive coil or Hall element, Detected 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 and detected by photo interrupter 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.

The light receiving unit 2 scans the bar code 8 and receives the reflected light of the emitted laser light. The reflected light to be received has an amount of light corresponding to the brightness of the bar code 8, and the light receiving unit 2 outputs a voltage signal corresponding to the amount of light. That is, when scanning is performed once from right to left as shown in the figure, the reflected light amount corresponding to the lightness and darkness of the barcode 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.

A voltage signal corresponding to the amount of light received by the light receiving section 2 is sent to an analog signal processing section 3, where the voltage signal includes a preamplifier circuit 3a, a variable gain amplifier circuit, and an amplifier circuit capable of setting an amplification factor. Amplification processing unit 3b amplified to an appropriate value that can be binarized via amplification processing unit 3b and amplified to an appropriate value
Is binarized by the binarization circuit 3c and sent to the digital signal processing unit 4.

The digital signal processing section 4 controls various sections 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 setting data to the EEPROM 7. Including
Reading, changing and setting of the resistance value of the digital potentiometer of the analog signal processing unit 3 (adjustment of the amplification factor of each amplifier circuit)
And the like, and inputs the binarized signal of the binarization circuit 3c, decodes the barcode based on the signal, and transfers the result to an external device via the interface unit 5,
It is displayed on the LED display section 6b.

For example, when a signal corresponding to the bar code 7 cannot be obtained in a preset scanning time, an NG signal indicating that the bar code 7 is not properly read is displayed on the LED display section 6b, and an NG output from the interface 5a is output. At the same time, an NG command or the like is transferred from the interface 5b to an external device. When the NG command is decoded, an OK signal for reading the bar code 7 is displayed on the LED display unit 6b, an OK signal is output from the interface 5a, and the bar code is output from the interface 5b. Transfer data etc. to external devices.

In the optical information reading device thus configured, when the power is turned on 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 section 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 (scanning end point on the surface) at which reflection on that surface ends, a turn-off signal is sent to the laser drive circuit 1a to turn off the laser diode 1b.

That is, a turn-on / turn-off signal for the light emitting diode 1b is formed based on a motor synchronization signal, and one scanning laser beam crossing the bar code 7 is formed on one surface of the polygon mirror 1f, and the scanning range θ Is set to 60 degrees in this embodiment.

The light receiving section 2 receives the diffuse reflection light of the laser light irradiated on the bar code 8 according to the scanning, converts the light into a voltage signal having a magnitude corresponding to the amount of received light, 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 processing unit 4 normally decodes the barcode 8 when it is determined that the signal corresponds to the barcode 8 when the two codes coincide with each other.

Then, a laser beam irradiating section 1, a light receiving section 2, an analog signal processing section 3, a digital signal processing section 4, an interface section 5, and an EE which constitute an optical information reading apparatus.
The signal processing circuit section including the PROM 7 and the like is housed in a housing having a light transmitting window. In the optical information reading apparatus according to this embodiment, as shown in FIG. 4, a laser beam irradiation unit 1 includes a motor 14 having a polygon mirror 1f fixed to a motor substrate 11 on a rotation axis and an LD module 1A.
The LD module holder 13 to which is fixed is fixed. L
The D module 1A 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.

The components constituting the signal processing circuit 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 a flexible circuit board 22 so as to be bent and located on the bottom 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 mounted on the circuit board 21a located on the bottom side, and the circuit board 21 located on the top side.
The circuit component of the digital signal processing unit 4 is formed in c, and the wire connection part is formed in the circuit board 21b located on the rear side.

FIG. 3 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. 5, the LD module 1A and the polygon mirror 1f shown in FIG. Cable 23 to which the motor board 11 to which the bush 24 has been fixed and the motor board 11 to which the
And connect each of the circuit boards 21b to 21d to the LD module 1
A and B are bent at the flexible circuit board 22 so as to surround the polygon mirror 1f, and the circuit board 21e is connected to the LD module 12 to make the apparatus body 25 compact.

The compacted apparatus body 25 is fitted and fixed to a resin chassis (frame body) 27 which is opened so that parts can be observed and operated from all directions. Is fixedly fitted. Frame 26 to which light receiving element module 2 is fixed
In the upper part, a space 26b through which the laser light is transmitted is formed,
A window through which the reflected light is transmitted is formed under the window, and a light receiving element module 2 such as a photodiode is fixed inside the window. On the front surface of the window, a louver in which transparent members and non-transparent members are alternately laminated, and a mechanism 26a for blocking disturbance light and disturbance electromagnetic waves in which a transparent conductive film is attached to the front surface of the louver are arranged. ing.

Reference numeral 28 denotes an upper housing having an opening formed on a bottom surface for inserting a component constituting the optical information reading device, and a window 28a for transmitting laser light and transmitting reflected light on the front surface thereof.
However, a cutout portion 28b is formed on the side surface of the cutout portion 28b which is continuous with the opening of the triangular bottom surface into which the electric cable 23 is inserted.
A convex portion 28d for fitting and fixing a bushing 24 into which the electric wire cable 23 is inserted and fixed is formed around the outside of b.
The key top 35 is provided on the side opposite to the notch 28b.
Is formed.

A window glass 29 is fitted in the window 28a, and an insulating sheet 31 is provided inside the window glass 29 and on the inside of the rear surface of the upper housing 28.
And 32 are attached. Numeral 34 denotes a bottom case which closes an opening on the bottom surface of the upper case 28, a frame body on which an insulating sheet 33 is laid under the light receiving element module 2 and a frame 26 to which the device main body 25 and the light receiving element module 2 are mounted is fixed. 27 is placed, covered with the upper housing 28, and fixed 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. When the opening on the bottom surface of the upper housing 28 is closed by the bottom housing 34, the cutout portion 28 b of the upper housing 28 becomes a through hole of the housing.
Is closed by a bushing 24 into which the wire is fixed.

The electric wire cable 23 is the same as that shown in FIG. 7 in that a plurality of insulated wires 23b are bundled and an electric shield body 23a is arranged around the outer periphery thereof to be insulated and covered. A bushing 24 is integrally formed at the tip of the insulating coating.
, And the individual electric wires 23b are drawn out of the housing 28. The installation of the electric cable 23 is shown in FIG.
And FIG.

The bushing 24 has a triangular outer shape,
A fitting projection 24a is formed on the outer peripheral surface. on the other hand,
A triangular cutout 28b having the same shape as the bushing 24 is formed on a side surface of the housing 28, and a convex portion 28d having a fitting concave portion 28e fitted with the fitting convex portion 24a around the outside of the cutout portion 28b. Is formed, and the fitting projection 24a of the bushing 24 is fitted into the fitting recess 28e, and the notch 2 is formed.
8b is closed with a bushing 24.

When fitting the bushing 24 and the notch 28b, specifically, when fitting the protrusion 28d, an adhesive is applied to the joint surface of the protrusion 28d with the bushing 24 as necessary. Due to the triangular shape, the adhesive can be applied to the entire wall surface of the joint surface of the cutout portion 28b evenly with the tip of the nozzle for discharging the adhesive facing downward, for example, and the bushing and the fitting joint There is no vertical region on the wall surface of the notch, and the downward flow of the adhesive after application is suppressed, so that the adhesive layer can be formed almost uniformly on the entire wall surface of the notch.

The individual electric wires 23b inserted into the housing 28
As shown in FIG. 2, the connector is connected to a connection portion 38 such as a connector or a soldering land provided on the circuit board 21b located on the rear side surface. The distances are variously different, and are set to lengths corresponding to the distances of the respective connection positions.
In this embodiment, there are seven individual electric wires 23b, and two electric wires 23b have different lengths. With this setting, the slack of the electric wire is eliminated, and the polygon mirror 1f is driven to rotate.
Can be avoided.

In this embodiment, the bushing 24
The cutout 28b has a triangular outer shape, but is not limited to a triangular shape. For example, the cutout 28b may have any shape, such as an arc, whose width decreases as the distance from the opening increases. With this shape, the direction of the tip of the nozzle for discharging the adhesive can be easily operated, or the notch 28 can be fixed in a fixed state.
The adhesive can be applied evenly to the entire wall surface of the joint surface b, and the vertical area is eliminated on the wall surface of the cutout portion which is fitted and joined to the bushing, thereby suppressing the downward flow of the adhesive after application. In addition, the adhesive layer can be formed substantially evenly on all the wall surfaces of the notch. Further, a convex portion for fitting the bushing 24 is formed around the notch portion 28b to reinforce the bushing 24, but it may be fitted to the peripheral wall of the notch portion 28b.

[0037]

As described above in detail, according to the present invention, the shape of the notch connected to the bushing and the opening for inserting the component on the side wall of the housing to be fitted with the bushing is made farther from the opening for inserting the component. When the adhesive is applied to the peripheral surface of the notch, the adhesive layer can be formed almost uniformly on the entire wall surface of the notch to be fitted and joined to the bushing. Thereby, waterproofness can be improved.

Further, by covering the electric shield body of the electric cable with the bushing, the electric shield body is drawn out into the housing, and the trouble of covering the peripheral portion of the electric shield body inserted into the housing with the heat shrinkable tube or the like can be omitted, and By pulling out the electric shield body into the housing, the electric wires in the housing can be shortened, and the length of the electric wires inserted into the housing is set to a length corresponding to the distance of the connection position, thereby reducing the time and effort required for bending the electric wires. The space occupied by the electric wires can be reduced, and there is no fear of interference between the electric wires and the internal components, so that a more reliable and smaller optical information reading device with high reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a mounting structure of an electric cable of an optical information reading apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the mounting structure of FIG.

FIG. 3 is an assembled perspective view of the optical information reading device according to the embodiment of the present invention.

FIG. 4 is a perspective view of a laser light irradiation unit of the optical information reading device according to the embodiment of the present invention.

FIG. 5 is a plan view of a circuit board of the optical information reading device according to the embodiment of the present invention.

FIG. 6 is a block diagram showing an overall circuit configuration of the optical information reading device according to the embodiment of the present invention.

FIG. 7 is a perspective view showing a mounting structure of an electric cable in a conventional optical information reading apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laser light irradiation part 1A LD module 1a Laser drive circuit 1b Laser diode 1c Lens 1d Slit 1f Polygon mirror 2 Light receiving part 3 Analog signal processing part 3b Variable gain amplification means 3c Binarization circuit 4 Digital signal processing part 5 Interface part 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 23a Electric shield 23b Electric wire 24 Bushing 24a Fitting convexity 25 Device body 26 Frame 26a Disturbance light and disturbance Electromagnetic wave blocking mechanism 27 Frame 28 Upper housing 28a Light transmission window 28b Notch 28d Convex 28e Fitting recess 34 Bottom housing 38 Connection

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4E352 AA03 AA16 BB07 BB08 BB10 CC02 CC20 DD02 DD06 DR02 DR14 DR19 DR46 FF06 GG04 5B072 CC24 DD01 JJ10

Claims (3)

[Claims] 1. A notch portion which is continuous with an opening for inserting a component is formed on a side wall of a housing for storing a component constituting an optical information reading device therein, and a bushing penetrating an electric cable is fitted into the notch portion. In the fixing structure of the electric information cable for an optical information reading device, wherein the notch portion is connected to the opening and the width thereof is reduced as the distance from the opening increases. An installation structure of an electric cable for an optical information reading device, characterized by comprising: 2. A through-hole is formed in a side wall of a housing for housing components constituting an optical information reading device therein, and an electric wire cable in which a plurality of electric wires are bundled is inserted into the through-hole. In the structure for mounting an optical information reading device electric wire cable, wherein each electric wire of the electric wire cable inserted into the connector is connected to the component, the electric wire of each electric wire of the electric wire cable inserted into the housing. The length of the connector is set to a length corresponding to a different distance of the connector from the through hole when the wire connection position of the connector is different from the through hole. Construction. 3. An electric wire having a through-hole formed in a side wall of a housing for housing a component constituting an optical information reading device therein, and an electric shield disposed around the through-hole in the through-hole to be insulated. An optical information reading device in which a bushing penetrating a cable is fitted and fixed, the electric cable is inserted into the housing, and the electric cable inserted into the housing is connected to a connection portion connected to the component. In the mounting structure for an electric cable for an optical information reader, the bushing is fixed to a tip of an insulating coating of the electric cable and covers an electric shield of the electric cable. .