JP3029104B1 - Code identification device for electronic components - Google Patents

Abstract

The present invention efficiently determines whether or not a code is accurately displayed on an electronic component. SOLUTION: An electronic component is arranged in a length direction of a sign display area (2b).
By relatively moving (1) and the sensor device (3), a detection signal representing the brightness of the code display area (2b) is extracted by the code sensor (5) of the sensor device (3). Further, the limit value of the light / dark pattern of the code display area (2b) stored in the storage circuit (27) is compared with the detection signal of the sensor device (3), and the detection signal of the code sensor (5) is compared with the limit value. Sign display area depending on whether it is within the range
The quality of the display of the code (2d) displayed in (2b) is determined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a code discriminating technique, and more particularly to a code discriminating apparatus for an electronic component for discriminating the accuracy of a code displayed on the surface of an electronic component.

[0002]

2. Description of the Related Art Electronic components such as diodes, transistors, and hybrid ICs have a resin sealed body containing an electronic circuit or a circuit board and a plurality of external terminals derived from the resin sealed body. The code | symbol which shows the model number of a part is attached to the main surface of a resin sealing body. When mounting such an electronic component on a printed circuit board, it is necessary to determine whether or not the electronic component is a predetermined electronic component by reading a code indicating a model number of the electronic component.

Conventionally, as shown in FIG. 9, for example, codes are read using a reflection type photo sensor (31). At the time of discrimination, the resin sealing body (2) of the electronic component (1) marked with a code is temporarily fixed at a predetermined position below the reflection type photosensor (31) to constitute the electronic component (1). Resin sealing body
The main surface (2a) of (2) is irradiated with light from the light emitting section of the reflective photosensor (31). After the irradiated light is reflected from the main surface (2a) and the light reflected by the light receiving portion of the reflection type photo sensor (31) is received, the brightness of the reflected light is identified and the display quality of the code display area (2b) is determined. Is determined.

[0004] Alternatively, as shown in FIG.
The image of the code display area (2b) displayed on the main surface (2a) of the resin sealing body (2) is captured by the camera (32), and the obtained image information is subjected to image recognition or character recognition in the monitor (33). Thus, the quality of the display of the code display area (2b) is determined.

[0005]

[Problems to be Solved by the Invention] Reflection type photo sensor (3
The method of determining the display quality of the code display area (2b) according to 1) can use an inexpensive photosensor, but has the disadvantage of low determination accuracy. In addition, the electronic component (1) is temporarily stopped at the time of discrimination, and a considerable reading time is required for accurate discrimination. Therefore, there is a disadvantage that the discrimination time cannot be shortened and the inspection efficiency cannot be improved. After the image is detected by the CCD camera (32), the method of recognizing the image has high discrimination accuracy, but requires an expensive image recognizing device. There is a disadvantage that the inspection efficiency of the electronic component (1) cannot be improved because the determination is made by performing the determination.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic component code discriminating apparatus capable of efficiently discriminating the accuracy of a code displayed on an electronic component. Another object of the present invention is to provide an electronic component code discriminating apparatus that can efficiently discriminate the accuracy of a plurality of codes displayed at predetermined positions on an electronic component. Further, the present invention provides an electronic component code discriminating apparatus that can continuously and automatically determine the accuracy of a plurality of codes displayed on the electronic component while relatively moving the electronic component with respect to the sensor device. The purpose is to do.

[0007]

A sign discriminating apparatus for an electronic component of the present invention for discriminating the quality of a sign (2d) displayed on an electronic component (1) is provided on a main surface (2a) of the electronic component (1). A sensor device (3) having a sign sensor (5) for detecting the brightness of a provided sign display area (2b) and generating a detection signal, and an array of signs (2d) displayed in the sign display area (2b). A transfer device (6) that relatively moves the electronic component (1) and the sensor device (3) in the direction, and a storage circuit (2) that stores a limit value of a light-dark pattern of the code display area (2b).
7) and the detection signal of the code sensor (5) is compared with the light / dark pattern of the code display area (2b) stored in the storage circuit (27), and the detection signal of the code sensor (5) is within the limit value. Discrimination control circuit for judging the quality of the display of code (2d) based on whether
(7).

The transport device (6) includes a transport rail (9) for guiding the moving electronic component (1) or the sensor device (3), and a transport rail.
(9) and a holder (10) for holding the electronic component (1) or the sensor device (3), and the electronic component (1) is moved along the transport rail (9) by a drive signal from the discrimination control circuit (7). ) Or sensor device
(3) is moved linearly. Further, the sensor device (3) includes a detection sensor (4) that detects the passage of the electronic component (1) and generates a detection signal, and the detection sensor (4) and the code sensor (5) include a transport rail (9). Are arranged at right angles to the length direction.

[0009] The electronic components are arranged in the length direction of the code display area (2b).
(1) and the sensor device (3) are relatively moved, and the detection signal representing the brightness of the relatively moving code display area (2b) is extracted by the code sensor (5), thereby improving the efficiency of the discriminating operation. As well as multiple codes displayed in the code display area (2b).
(2d) can be detected simultaneously.

In the embodiment of the present invention, a pulse generation circuit (8) for continuously generating a pulse signal at a predetermined time interval is provided, and a discrimination control circuit (7) is provided with a detection signal of a code sensor (5). The detection counter (23) counts the number of pulses generated from the pulse generation circuit (8) when
Judgment circuit to judge whether the count value of 3) falls within the limit value range and generate an output when the count value does not fall within the limit value
(24).

The discrimination control circuit (7) counts the frequency divider (25) that divides the pulse signal of the pulse generation circuit (8) to generate an output, and counts the output of the frequency divider (25). An address counter (26) for generating an address signal indicating addresses of a plurality of marking areas (A to D) for dividing the code display area (2b). When receiving the address signal of the address counter (26), the storage circuit (27) gives the storage signal indicating the limit value of the light and dark pattern corresponding to each of the marking areas (A to D) to the determination circuit (24). I do. The discrimination circuit (24) compares the stored signal of the storage circuit (27) with the count value of the detection counter (23), and generates an output when the count value of the detection counter (23) exceeds the limit value.

The sensor device (3) includes a detection sensor (4) that detects the passage of the electronic component (1) and generates a detection signal. The detection counter (23) includes a detection sensor (4) that generates a detection signal. At the same time, the number of pulses generated from the pulse generation circuit (8) when the detection signal of the code sensor (5) is generated is counted. The pulse generation circuit (8) is a rotary encoder that generates a pulse in synchronization with the rotation of a conveyance motor provided in the oscillation circuit or the conveyance device (6).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electronic component code discriminating apparatus according to the present invention will be described below with reference to FIGS.

As shown in FIG. 1, an electronic component code discriminating apparatus according to the present invention comprises an electronic device having a resin sealing body (2) and a plurality of external terminals (2c) derived from the resin sealing body (2). Parts (1)
And a sensor device (3) arranged adjacent to the transfer device (6). On the main surface (2a) of the resin sealing body (2) of the electronic component (1), there is provided a code display area (2b) displaying a four-digit code (2d) stamped by applying marking ink. Can be For example, a plurality of codes (2d) indicating the type of the electronic component (1) are arranged at right angles to the length direction of the external terminal (2c). Although not shown, inside the resin sealing body (2) of the electronic component (1), a support plate, a semiconductor element or an electronic circuit fixed on the support plate and electrically connected to the external terminal (2c) or A circuit board is sealed and contained. The transfer device (6) includes a transfer rail (9) and a holder (10) for holding the resin sealing body (2) of the electronic component (1) on the transfer rail (9). The external terminal (2c) projects laterally from the transport rail (9). The sensor device (3) detects a passage of the electronic component (1) through the resin sealing body (2) along a scanning line (4a) parallel to the transport rail (9) and generates a detection signal ( 4) and a code sensor (5) that detects the brightness of the code (2d) displayed in the code display area (2b) along the scanning line (5a) parallel to the transport rail (9) and generates a detection signal. And The sign sensor (5) and the detection sensor (4) are arranged at right angles to the length direction of the transport rail (9) and in parallel with the external terminal (2c). As shown in FIG. 3, the sensor device (3) has a resin case (3a) in which two openings (3b) in which the detection sensor (4) and the code sensor (5) are respectively arranged are formed. . The detection sensor (4) is a light-emitting element (1
1) and the light emitting element arranged in parallel with the light emitting element (11).
A light-reflecting photocoupler including a light-receiving element (12) for irradiating light from (11) and receiving reflected light of the resin sealing body (2) that passes therethrough is used. The sign sensor (5) has the same structure as the detection sensor (4), and the light reflection type photocoupler is a sensor device (3).
Suitable for miniaturization.

As shown in FIG. 4, the electronic component code discriminating apparatus according to the present embodiment comprises a discrimination control circuit (7), a pulse control circuit connected to the input terminal of the discrimination control circuit (7) and having a predetermined time interval. A pulse generation circuit (8) for continuously generating a signal,
A ROM (13) that stores a program for determining an operation sequence of the discrimination control circuit (7) and is electrically connected to the discrimination control circuit (7), and is connected to different output terminals of the discrimination control circuit (7). Detection sensor (4), sign sensor (5), transport device (6)
And a display (28). The pulse generating circuit (8) generates a clock pulse synchronized with the relative movement of the electronic component (1). The transport device (6) is driven by a drive signal from the discrimination control circuit (7) and is driven by the electronic component (1) along the transport rail (9).
And a transfer motor constituted by an actuator (not shown) such as an electric motor, a pneumatic motor or a solenoid for moving the actuator linearly. The display (28) is constituted by a visual display device such as a light emitting diode or an auditory display device such as a buzzer.

As shown in FIG. 5, the discrimination control circuit (7)
An AND gate (20) that receives output signals of the detection sensor (4) and the sign sensor (5); an AND gate (21) that receives output signals of the AND gate (20) and the pulse generation circuit (8); An AND gate (22) that receives the output signals of the sensor (4) and the pulse generation circuit (8), a frequency divider (25) that divides the output of the AND gate (22), and counts the output of the frequency divider Scan line (5
an address counter (26) for generating an address signal representing the marking area (A-D) of the code display area (2b) divided along, for example, four marking areas (A-D), and an AND gate ( A detection counter (23) that counts the output signal of (21) and is reset by the output of the frequency divider (25);
(2b) a storage circuit (27) for storing a limit value of a light and dark pattern required for each marking area (A to D), and each marking area (A
~ D), the count value counted by the counter (23) is compared with the limit value of the light and dark pattern stored in the storage circuit (27), and the detection signal of the sign sensor (5) is in the range of the limit value. And a determination circuit (24) for generating an output to the display (28) and the transport device (6) when it exceeds the limit value. The pulse generation circuit (8) is an oscillation circuit or a carrier device (6)
A rotary encoder that generates a pulse in synchronization with the rotation of the transport motor provided in the printer is used. Pulse generation circuit
If a rotary encoder is used for (8), the number of generated pulses is constant with respect to the transport distance even if the transport speed of the electronic component (1) changes, and the number of pulses on the resin sealing body (2) The display quality of (2d) can be reliably determined.

When the display of the code (2d) of the electronic component (1) is determined by using the electronic component code determination device shown in FIGS. 1 to 5, the main component of the electronic component (1) is first determined. A circuit for storing the limit value of the light / dark pattern of the code display area (2b) formed on the surface (2a)
(27). Next, the discrimination circuit of the discrimination control circuit (7)
A drive signal is supplied from (24) to the transfer device (6) to transfer the transfer device (6).
Is driven. The electronic component (1) is moved along the transport rail (9) by driving the transport motor,
The detection sensor (4) and the sign sensor (5) are each a scanning line (4a)
In accordance with (5a), the brightness on the resin sealing body (2) is converted into an electric signal and transmitted to the discrimination control circuit (7). As shown in FIG. 6 (1), the detection sensor (4) is turned on at time t ₀ of detecting the resin sealing body (2), off time t ₃ when completing the detection of the resin sealing body (2) Becomes The pulse width of the ON signal of the detection sensor (4) corresponds to the length of the resin sealing body (2) along the scanning line (4a) including the marking areas (A to D).

When the detection signal of the detection sensor (4) is turned on, the AND gate (22) shown in FIG.
The pulse which is continuously generated from is given to the frequency divider (25).
The total number of pulses generated from the pulse generation circuit (8) while the detection sensor (4) generates the ON signal is determined in advance, and
(25) generates four frequency-divided outputs corresponding to the total number of pulses of the pulse generating circuit (8) in accordance with the number 4 of the marking areas (A to D). The address counter (26) counts the output of the frequency divider (25) and generates an address signal of addresses 1 to 4 corresponding to the marking areas (A to D) in the storage circuit (27).

As shown in FIG. 6 (2), the resin sealing body (2)
In time t ₁ that has detected the sign (2d) above, the detection signal of the code sensor (5) is turned on, the scanning lines until turned off at time t ₂
(5a) A pulse having a pulse width corresponding to the code (2d) above is generated. While the detection signal of the code sensor (5) is on, the pulse signal generated from the pulse generation circuit (8) is counted by the detection counter (23). When the detection signal of the code sensor (5) is turned off at time t _2, the detection counter (23) stops the counting of the pulse signal. A plurality of codes (2d) displayed in the code display area (2b) are continuously detected along the scanning direction of the code sensor (5), and the mark sensors (5) are used to detect the marking areas (A to D) in the same manner as described above. The pulse signal when the code (2d) is detected is detected by the detection counter (2
Count according to 3). Therefore, when the detection signal of the detection sensor (4) is turned on, the AND gate (20) sends the pulse of the sign sensor (5) to the AND gate (21). As shown in FIG. 6 (3), the AND gate (21) sends the pulse of the pulse generation circuit (8) to the code counter (23) while receiving the pulse of the code sensor (5), and the code counter (23). ) Is a pulse generation circuit
The pulse of (8) is counted and reset by the output of the divider (25) at the end of the marking area (A to D).

In the present embodiment, as shown in FIG. 1, four marking areas (A to A) provided in the code display area (2b) are provided.
In D), a four-digit number “1234” is displayed as a code (2d). The display of each code "1", "2", "3", and "4" generates three, five, four, and twelve pulses, respectively, and these pulses are counted by the code counter (23). Is done. Actually, for example, the pulse interval generated from the pulse generating circuit 8 oscillating at 20 kHz is very short, so that the number of pulses output from the AND gate 21 is completely different with different codes. If necessary, while counting the output of the pulse generating circuit (8), each marking area (A to D)
The type of code may be determined by measuring the position where each pulse is generated from the tip of the symbol.

When the memory circuit (27) receives the address signal sent from the address counter (26), the limit value of the pattern called by the address signals 1 to 4 representing the addresses of the marking areas (A to D). Circuit for discriminating stored information representing
Send to (24). When reading the pulse number of the code (2d) displayed in the marking area (A to D), the pulse number of the same code (2d) generated from the code sensor (5) is not necessarily constant, and the state of the marking or It differs depending on the transfer speed of the sensor device (3) by the transfer device (6). Therefore, a certain allowable range is set for the number of pulses counted when identifying the specific code (2d), and the allowable range of the number of pulses differs for each different code. Therefore, the code can be specified based on whether or not the number of pulses within the set allowable range is counted.

The discrimination circuit (24) compares the counted value of the number of pulses sent from the code counter (23) with the allowable range of the number of pulses sent from the storage circuit (27), and checks each marking area (A
It is determined whether or not the code displayed in (D) is a predetermined code. When a predetermined code is not displayed in each of the marking areas (A to D), the discrimination circuit (24) displays the display (28) and the transport device.
By applying an output to (6), the indicator (28) is operated, the sign difference state is displayed, and the transport device (6) can be stopped.

As described above, in the present embodiment, the electronic component (1) is moved in the length direction of the code display area (2b), and the detection signal indicating the brightness of the moving code display area (2b) is converted to the code. Since it is taken out by the sensor (5), the efficiency of the discrimination operation can be improved, and a plurality of codes (2d) displayed in the code display area (2b) can be simultaneously detected.

In the present embodiment, the following operation and effect can be obtained. [1] While moving the electronic component (1) relatively,
Since d) is detected, the efficiency of the discrimination operation can be improved. [2] A plurality of codes (2d) displayed in the code display area (2b) can be simultaneously detected while relatively moving the electronic component (1). [3] Even if the moving speed of the electronic component (1) or the sign sensor (5) changes, the sign (2d) can be instantaneously and accurately detected. [4] The code is obtained by automatically operating the discrimination control circuit (7).
(2d) can be detected automatically. [5] By using an existing photocoupler for the sensor device (3), an extremely inexpensive code discriminating device for electronic components can be realized. [6] It is possible to easily automate the code discriminating device of the electronic component (1). [7] When a rotary encoder that generates a pulse according to the rotation of the transport motor is used as the pulse generation circuit (8), the number of generated pulses changes according to the speed change even if the transport speed changes. Therefore, even if the relative speed of the electronic component (1) fluctuates, the quality of the code (2d) in the code display area (2b) can be accurately determined.

The above embodiment of the present invention can be variously modified. For example, FIGS. 1 and 2 show an example in which the sensor device (3) is fixed and the electronic component (1) is moved. However, as shown in FIG. 7, the electronic component (1) is attached to a pair of holders (10). Even if the sensor device (3) is moved by the transfer device (6) in the length direction of the code display area (2b) of the electronic component (1) by the transfer device (6), the quality of the display of the code (2d) is detected. In this case, the same operation and effect as those of the above embodiment can be obtained. Although only one electronic component (1) is shown in FIGS. 1 and 2, actually, as shown in FIG. 8, a plurality of electronic components (1) held by the holder (10) are displayed in the code display area ( 2b) A plurality of electronic components (1) may be arranged at a predetermined interval in the length direction and may be simultaneously detected by a single sensor device (3) as to whether or not the display of the code (2d) of the plurality of electronic components (1).

[0026]

As described above, according to the present invention, it is possible to accurately, easily and automatically determine whether or not a predetermined code is displayed on an electronic component, thereby improving the productivity of the electronic component and reducing the production cost. In addition to the reduction, the reliability of the electronic component can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an electronic component code identification device according to the present invention.

FIG. 2 is a front view showing an embodiment of an electronic component code discriminating apparatus according to the present invention.

FIG. 3 is a sectional view showing an electronic component passing through the sensor device.

FIG. 4 is a circuit diagram of a code discriminating apparatus for an electronic component according to the present invention.

FIG. 5 is a circuit diagram showing a detailed block diagram of a discrimination control circuit.

FIG. 6 is a time chart of detection signals of a detection sensor and a sign sensor, and a pulse signal input to a detection counter.

FIG. 7 is a plan view of a code discriminating apparatus for an electronic component according to another embodiment of the present invention.

FIG. 8 is a plan view of a code discriminating apparatus for an electronic component according to still another embodiment of the present invention.

FIG. 9 is a front view of a conventional electronic component code discriminating apparatus using a light reflection type photosensor.

FIG. 10 is a front view of a conventional electronic device code discriminating apparatus using a CCD camera.

[Explanation of symbols]

(1) ・ ・ Electronic parts, (2) ・ ・ Resin sealed body, (2a) ・ ・ Main surface, (2b) ・ ・ Sign display area, (2c) ・ ・ External terminal,
(2d) ··· Sign, (3) ··· Sensor device, (4) ··· Detection sensor, (4a) ··· Scan line, (5) ··· Sign sensor, (5
a) scanning line, (6) transport device, (7) discrimination control circuit, (8) pulse generation circuit, (9) transport rail,
(10) Holder, (11) Light emitting element, (12) Light receiving element, (23) Detection counter, (24) Identification circuit, (25) Divider, (26) ) ・ ・ Address counter,
(27) ・ ・ Memory circuits,

Claims (5)

(57) [Claims] 1. A sensor device having a sign sensor for detecting the brightness of a sign display area provided on a main surface of an electronic component and generating a detection signal, and a sensor arranged in the arrangement direction of the signs displayed in the sign display area. A transport device that relatively moves the electronic component and the sensor device, a storage circuit that stores a limit value of a light-dark pattern in the code display area, a detection signal of the code sensor, and the code display stored in the storage circuit. And a discrimination control circuit for comparing the light / dark pattern of the area with the detection signal of the code sensor to determine whether the display of the code is good or not according to whether or not the detection signal of the code sensor is within a range of a limit value. In the electronic component code determination device for determining whether the code is acceptable, the transport device includes a transport rail that guides the moving electronic component or the sensor device, and the electronic component on the transport rail. Comprises a holder for gripping the sensor device,
The electronic component or the sensor device is linearly moved along the transport rail by a drive signal from the discrimination control circuit, and the sensor device detects a passage of the electronic component and generates a detection sensor that generates a detection signal. Wherein the detection sensor and the code sensor are arranged at right angles to a length direction of the transport rail. 2. A pulse generation circuit for continuously generating a pulse signal at a predetermined time interval, wherein the discrimination control circuit is configured to generate a pulse signal from the pulse generation circuit when a detection signal of the code sensor is generated. And a determination circuit for determining whether the count value of the detection counter falls within the range of the limit value and generating an output when the count value does not fall within the range of the limit value. 2. The code discriminating apparatus for electronic components according to 1. 3. The discrimination control circuit divides the pulse signal of the pulse generation circuit to generate an output, and counts the output of the frequency divider to divide the code display area. An address counter for generating an address signal representing an address of a plurality of marking areas, when the address signal of the address counter is received,
The storage circuit applies a storage signal indicating a limit value of a light and dark pattern corresponding to each of the marking areas to the determination circuit, and the determination circuit calculates a storage signal of the storage circuit and a count value of the detection counter. 3. The electronic component code determination device according to claim 2, wherein an output is generated when the count value of the detection counter exceeds the limit value. 4. The sensor device includes a detection sensor that detects passage of the electronic component and generates a detection signal. The detection counter includes a detection signal generated by the code sensor at the same time that the detection sensor generates a detection signal. The code discriminating apparatus for an electronic component according to claim 2, wherein the number of pulses generated from the pulse generating circuit when the error occurs is counted. 5. The pulse generation circuit according to claim 2, wherein the pulse generation circuit is an oscillating circuit or a rotary encoder that generates a pulse in synchronization with rotation of a conveyance motor provided in the conveyance device.
The code discriminating apparatus for an electronic component according to any one of the above.