JPS603944B2 - Original drawing reading device - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for making only the positions of marks for drilling, etc., drawn on the original drawing, when the positions thereof are in a fixed relationship with each other like the squares of graph paper. The present invention relates to an original copy reading device that reads and stores original drawings.

The read information can be stored or read out for processing as position data. As an example of a conventional device, as described in Japanese Patent Application Laid-open No. 52-150556, marks on an original drawing placed on a movable table are sequentially observed, the observation results are stored in a storage device, and the marks on the same table are There are some machines that are processed by replacing the workpiece above.

However, with this follower device, the mark on the original drawing projected on the projector is placed in the center of the screen, and the device is operated by hand to read the mark's position, so if the mark is misaligned, , it may take a long time to operate, or the page may be skipped. In particular, recent mounting of components on printed circuit boards often requires high-density mounting, and a high degree of dimensional accuracy is required for component mounting hole positions.Furthermore, there are differences in machined hole diameters, so It takes a considerable amount of time to read, inspect, and correct. This invention is
In order to solve these problems, when the positions of the marks drawn on the original drawing are in a certain relationship with each other, these mark rows are scanned and only the marks are detected electronically. It identifies the position and size of the mark and stores it as position data, making it possible to reliably scan the original drawing in a short time.

An example of the original drawing is shown in Figure 1. The distance between lines 12A, 12B, 12C, etc. in the horizontal direction (hereinafter referred to as the x direction) is D, and the distance between them in the vertical direction (hereinafter referred to as the Y direction) is D.
Intersection 14A of lines 1 3A, 1 3B, 13C, etc. of 2,
Write marks 1 1A and 11B on 14B, etc. 1st
In the example shown, the intervals D, , D2 are almost the same, but
Interval D, , sheep interval D2 is also acceptable. Also, line 1
2. Even if line 13 etc. are not filled in, mark 11A,
11B, etc. may be located at positions such as the intersections 14A, 14B. An example of such an original drawing is a drawing for specifying the position of holes to attach parts to a printed circuit board, and the standard spacing used in this drawing is 2.5 ribs in each of the x and y directions. There is one with 2.54 ribs. The original drawing is made of film, glass, metal, plastic plate, paper, etc., and has a size that can be placed on the moving table 2, which will be described later. Also, mark 11 on the original drawing
There are three ways to enter: A. In the case of using two colors, bright and dark, the mark 11 is identified by the difference in the reflection ratio of light. For example, colors with clear brightness and dark, such as white and black, are used.

Figure 2A is an example in which black marks 11E, 11F, etc. are placed on the original drawing 1 on a white background, and Figure 2B is an example in which white marks 11G, 11th, etc. are placed on the original drawing 1 on a black background. . In this case, the presence or absence of the mark 11 is determined by detecting the intensity of the reflected light from the mark 11 as a change in electrical resistance using a photodiode or the like. In the case of using colors with a large wavelength difference, for example, the marks 11 are identified by colors such as red, blue, green, etc., which have a large wavelength difference with each other. Different marks 11 can be inserted.

In this case, a photodiode or the like having different sensitivity depending on the wavelength of light is used for detection. (c) In the case of depending on the shape of the mark 11 The mark 11 is identified by a specific shape that is easy to identify, such as a circle, triangle, or star shape.Several different types of indications can be included in the same way as in the case of mark 11.

In this case as well, a photodiode or the like can be combined to identify a specific shape. FIG. 3 shows an embodiment in which the original drawing 1 is attached to the movable table.

FIG. 3A is a plan view, and FIG. 3B is a front view. Place the original drawing 1 on the moving table 2, aligning it so that the several reference lines 21 provided on the moving table 2 and the several reference marks 15 provided on the original drawing 1 overlap each other, and place the original drawing 1 on the moving table 2. Fix it with 22 etc. As a result, the relative positions of the original drawing 1, the moving table 2, and the cutting head 3 are adjusted, and the cutting scanning described later can be performed accurately using the cutting reference point 16 provided in the original drawing 1 as a starting point. become. Here, a configuration diagram of an embodiment of this invention device is shown in FIG.

The ball screws 5A, 58 are oriented in the x direction and the y direction, and connect the motors 4A, 4B, respectively. Therefore, when the motors 4A, 4B are rotated, the ball screws 5A, 5B are also rotated. Since the movable table 2 is equipped with ball nuts (not shown) that engage with the ball screws 5A and 5B, if the motor controller 41 controls the amount and direction of rotation of the motors 4A and 4B, the movable table
The bull 2 can be moved in the x direction and the y direction. When the movement of the moving table 2 finishes scanning one row in the x direction of the original image 1, the moving table 2 is moved in the y direction by an interval D2 in FIG.

Then, the moving table 2 is moved in the opposite direction to the X direction in which it was moved immediately before, and scanning of the next column is started. In the example of FIG. 4, since the cutting reference point 16 of the original drawing 1 is located at the upper left of the original drawing 1, the cutting reference point 16 is first placed under the optical axis 31 of the cutting head 3.

Next, the intersection 14 of the original drawing 1 is the intersection 14M, 14M2,
The movement of the moving table 2 is controlled so that it comes under the optical axis 31 of the reading head 3 in the order of 14M3, 14M4, . . . . Note that by controlling the input to the motor control section 41, the scanning range can be limited to only a specific range of the original drawing 1.

Detector 6A attached to ball screws 5A and 5B respectively
, 6B detect the moving distance of the moving table 2 in the Detector 6A,
6B converts the rotation of the ball screws 5A and 5B into electrical signals, and the side length devices 7A and 7B are the detectors 6A and 7B.
, 6B to electronically measure the moving distance. Therefore, the position of the intersection 14 appears as a distance in the x direction and the y direction with the reference point 16 as the base point. 8A, 88 is the distance D in the x direction between the intersection points 14. This is an interval setting switch for digitally setting the interval D2 in the Y direction and the interval D2 in the Y direction, and its output is led to the motor controller 41, which controls the amount and direction of rotation of the motors 4A and 4B as described above.

Further, a part of the output of the interval setting switch 8A is guided to a gate circuit 91, the gate of the gate circuit 91 is opened for each set value of the interval setting switch 8A, and the output of the side lengthener 7A is sent to a trigger circuit 92. On the other hand, the mark detector 32 provided in the reading head 3 sends its output signal to the determination circuit 93, and the determination circuit 93 confirms the presence or absence of the mark 11 from the signal.

If there is a mark 11, it is used as a trigger signal to activate the trigger circuit 92, and the position of the mark 11 is stored in the memory circuit 95 as data input. As is clear from the above explanation, the gate circuit 91 opens the gate only when the intersection point 14 comes under the optical axis 31 of the mooring head 3.
Determine the presence or absence of.

Then, only when the mark 11 is located at the intersection 14,
The trigger circuit 92 is operated and the position of the mark 11 is stored in the memory circuit 95 as the distance from the Kendori reference point 16. The category selection circuit 94 is a circuit for selecting each output when the mark detector 32 outputs a plurality of outputs to identify the mark 11 by color or specific shape. It does not need to be used when distinguishing using two colors, bright and dark.

Next, FIG. 5 shows an embodiment of the configuration of the light detection section including the pick head 3 and mark detector 32.

The light from the light source 33 becomes an optical axis 31 from the mirror 34A and reaches the original image 1 on the moving table 2, and the reflected light from the original image 1 is projected onto the screen 35A or 35B by the upper mirror 34B whose reflection angle can be changed. . The screen 35A is for projecting the reflected light from the original drawing 1, and is used when first projecting the Kendori reference point 16 onto the reference point of the screen 35A to determine the starting position of the moving table 2, or when moving by hand to move the intersection point 14. Used when confirming the location.

A mark detector 32 incorporating an optical/electrical/conversion element such as a photodiode is attached to the screen 358.
The output is sent to the determination circuit 93 as described above. As described above in detail, the device of the present invention has the following effects.

Just by first aligning the Kendori reference point 16, the mark 11 can then be automatically read and memorized.

Therefore, conventional manual observation is not necessary. Since copying is done electronically, processing can be done in a shorter time than with conventional devices.

For example, while it took 10 strips to read about 200 marks with a secondary device, this embodiment of the inventive device can read about 2,500 solid marks in the same amount of time. Since position data is measured electronically, e.g. 0.0
It can be read accurately to within 10.01 ribs on one side.

[Brief explanation of the drawing]

Fig. 1 is a partial view of an example of the original drawing, Fig. 2 is an example of the display of the mark 11, Fig. 3 is an example of attaching the original drawing 1 to a moving table, and Fig. 4 is a configuration diagram of an embodiment of this invention device. , FIG. 5 is a block diagram of an embodiment of the photodetection section. 1... Original drawing, 2... Moving table, 3...
Argument head, 4A, 48...Motor, 5A, 5B...Pole screw, 6A, 6B...Detector, 7A, 7B...
Side lengthener, 8A, 8B... Interval setting switch, 11...
...Mark, 12, 13...Line, 14...Intersection, 15...
...Reference mark, 16...Reading reference point, 2
1...Reference line, 22...Pin, 31...
...Optical axis, 32...Mark detector, 33...Light source, 34A, 34B...Screen, 41...Motor controller, 91...Gate circuit,
92...Trigger circuit, 93...Judgment circuit, 94...Type selection circuit, 95...Memory circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. The mutual spacing in the lateral direction (hereinafter referred to as the X direction) is D_
In a device that scans and reads the mark 11 from the original drawing 1, in which the mark 11 is drawn at the intersection 14 of the line 13 of the drawing 1 and the line 13 whose mutual distance in the vertical direction (hereinafter referred to as the Y direction) is D_2, the movement of attaching the original drawing 1 A table 2, a reading head 3 that reads the presence or absence of the mark 11, and motors 4A and 4B that move the moving table 2 in the X direction and the Y direction, respectively.
The length measuring devices 7A and 7B measure the moving distance of the moving table 2 in the X and Y directions, the interval setting switches 8A and 8B set the distances of the intervals D_1 and D_2, and the values of the interval setting switches 8A and 8B determine the motor. A motor control circuit 41 that controls the amount and direction of rotation of 4A and 4B, and a mark detector 32 that is attached to the reading head 3 and detects the presence or absence of the mark 11.
, a gate circuit 91 which opens the gate in response to a signal from the interval setting switch 8A and allows the signal from the length measuring device 7A to pass through, a determination circuit 93 which determines the signal from the mark detection circuit 32, and a gate circuit 91, length measuring device 7B, and It is equipped with a trigger circuit 92 that operates based on a signal from a determination circuit 93 and a memory circuit 95 that stores the output of the trigger circuit 92. The movement of the moving table 2 is controlled so that the intersection point 14 comes under the optical axis 31 of the reading head 3, and the gate circuit 91 is activated.
The original copying and reading device is characterized in that a gate is opened, a trigger circuit 92 is operated only when a mark 11 is located at an intersection 14, and the position of the mark 11 is stored in a memory circuit 95. 2. An original copy reading device according to claim 1, which identifies marks 11 formed in two colors, bright and dark. 3. The original copy reading device according to claim 1, wherein the marks 11 formed in colors with a large wavelength difference are identified, and the output of the mark detector 32 is selected by the classification selection circuit 94. 4. The original copy reading device according to claim 1, wherein the mark 11 formed in a specific shape is identified and the output of the mark detector 32 is selected by the classification selection circuit 94.