JPS6129079Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a printed board information reading device that uses optical means to read various coded information written on a part of a printed board using conductive patterns and through holes. This is related to the improvement of.

Generally, when converting information related to the printed board into a binary code signal and writing it to a part of a printed board, if only the code signal is written, stable reading is not possible, so the information to which the code signal is written is A timing signal line is provided parallel to the signal line to indicate the timing (synchronization) for reading this code signal. However, in such devices, if a notch that reaches each signal line is created in the information area on the printed board due to a defect in the manufacturing process, etc., the notch cannot be read as a signal. Sometimes I put it away.

The present invention eliminates the drawbacks of conventional devices as described above, and uses information signal lines and timing signal lines to stably read information written on printed circuit boards without being affected by cutouts, etc. The purpose of this invention is to realize a printed board information reading device with a simple configuration.

The figure is a configuration diagram showing an embodiment of the printed board information reading device of the present invention. In the figure, PWB
is a printed board having an information area IA in a part thereof, and H is a through hole provided in response to a code signal or a timing signal. The arrow in the diagram is a printed board
This indicates the direction of movement of the PWB, and a through hole H is provided along that direction, forming an information signal line LD, a timing signal line LT, and a no-signal line LN. DET is a detector that detects the presence or absence of a through hole, So is a light emitter, S ₁ is the first sensor that scans the information signal line LD, and S ₂ is a timing signal line
2nd sensor scanning LT, S ₃ is no signal line
This is the third sensor that scans the LN. detector DET
is fixedly arranged on the movement trajectory of the printed board PWB, and the light emitter So and each sensor S ₁ to _{S 3} are connected to the printed board.
They are facing each other with PWB in between.

In the printed board information reading device of the present invention configured in this way, the through hole H passes between the detectors DET in accordance with the movement of the printed board PWB, and the sensors S ₁ to _{S 3} Continue to reach the light. Therefore, when the through hole H passes through the positions of the sensors S ₁ to S ₃ , the light enters the sensors S ₁ to _{S 3} ,
The output becomes a logic level, and the presence or absence of the through hole H is detected as an electrical signal corresponding to 1 or 0, for example. Here, if the output of the second sensor S ₂ is used as a synchronization signal and the output of the first sensor S ₁ is read, stable reading can be performed without being affected by the moving speed of the printed board PWB. can.
Also, since the third sensor _S3 is scanning the no-signal line LN, its output is always in the state of 0,
By monitoring this, it is possible to prevent malfunctions caused by cutouts in the printed board PWB. For example, as shown in the figure, if a notch CR occurs in the information area IA of the printed board PWB, when this notch CR passes the position of the detector DET,
The outputs of the first and second sensors S ₁ and S ₂ are both 1
Therefore, it is not possible to distinguish between the notch CR and the through hole H, but at this time, the output of the third sensor _S3 becomes 1 when it detects passage of the notch CR, so detection is performed according to this output. By prohibiting the device DET from reading information, malfunctions caused by the notch CR can be prevented. As shown in the figure, if the position of the through hole H overlaps with the notch CR, the position of the through hole H is shifted in advance and the position of the through hole H is overlapped with the notch CR.
A through hole H is provided to avoid this. At this time, the pitch of the through hole H in the information signal and timing signal will change due to the notch CR, but if the information signal and timing signal are a pair, the pitch will change. can also be read accurately.

In addition, in the detector DET, operations such as reading signals and inhibiting them are controlled by logical operations on the outputs of each sensor S ₁ to _{S 3} .
Only when the output of the third sensor _S3 is 0, the information signal is read based on the timing signal.

As explained above, in the printed board information reading device of the present invention, in addition to the sensor that scans the information signal line and the timing signal line, a third sensor that scans the non-signal line between these signal lines is provided, Since the outputs of these sensors are subjected to logical operations to control the reading of information,
It is possible to realize a printed board information reading device with a simple configuration that can perform stable reading without being affected by cutouts or the like generated in the information area.

[Brief explanation of the drawing]

The figure is a configuration diagram showing an embodiment of the printed board information reading device of the present invention. PWB...Printed board, IA...information area, LD
...Information signal line, LT...Timing signal line, LN...No signal line, H...Through hole, CR...
...Notch, DET...detector, So...light emitter, S ₁
~S ₃ ...Sensor.

Claims (1)

[Scope of utility model registration request] In a printed board information reading device that uses optical means to read various coded information written on a part of a printed board using conductive patterns or through holes, a first a second sensor that scans a timing signal line; and a third sensor that scans a no-signal line between the information signal line and the timing signal line; A printed board information reading device that performs logical operations on each output signal to control reading of information written on a printed board.