JPH0531083B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic coordinate reading device for reading the XY coordinate values of the center point of a hole mark on a drawing such as a printed circuit board original drawing film.

When reading the center point of a white hole mark surrounded by black with an automatic coordinate reading device, there is a 6th hole mark on this hole mark.
If a notch is formed due to an error in mark creation as shown in Figure B, the center point e between a and b and between c and d will be read. Similarly, when reading the black hole mark on the white background shown in Figure 6A,
If dust 2 adheres to the mark and the shape of the mark becomes almost elliptical, the center point f between a and b and between c and d will be read. However, hole marks 4 and 6
The correct center point of is g, h, and this point must be read. An object of the present invention is to enable accurate coordinate data of the center point of a hole mark to be obtained even if the shape of the hole mark is deformed.

The configuration of the present invention will be explained below with reference to the accompanying drawings.

Reference numeral 10 denotes a table fixed to the fuselage, and is made of a transparent plate. X rails 12 and 14 are fixedly installed on both sides of the table 10, and X cursors 16 and 18 are movably attached to the X rails 12 and 14. 20 is X cursor 16,1
8, and the carrier 22 is attached to this Y rail.
is movably mounted on the carrier 22, and a coordinate reading head 24 is mounted on the carrier 22. The X cursors 16 and 18 and the carrier 22 are configured to be driven along the X rails 12 and 14 and the Y rail 20 by respective built-in XY pulse motors (not shown). The above configuration constitutes a known numerical controller 26. Said head 2
4, a commercially available line scanner camera 28 and
An ITV camera 30 is attached. The ITV camera 30 covers a predetermined range on the table 10 using an index 32.
and an operation console 3 arranged adjacent to the table 10.
The image is configured to be displayed on the cathode ray tube screen 36 of the monitor television No. 4. A console 34 adjacent to the table 10 is provided with manually operated switches 38 consisting of a +X switch, a -X switch, a +Y switch, and a -Y switch. Said switch 3
When the +X switch in 8 is pressed, a plus direction pulse is supplied from the pulse oscillator to the X pulse motor, and the Y rail 20 moves along the X rails 12 and 14 in the direction of the +X coordinate axis. When the -X switch is pressed, the Y rail 20 moves in the direction of the -X coordinate axis. A counter 40 counts the amount of movement of the X cursors 16, 18 along the X rails 12, 14 and the amount of movement of the head 24 along the Y rail 20. Further, this amount of movement is also counted by the counter 40a.

Next, the structure of the head 24 will be explained with reference to FIG.

42 is a cylinder fixed to a substrate 44, and a commercially available lens cylinder 46 is fixed to this. A lens system (not shown) is arranged inside the lens barrel 46. 48 is a holder fixed to the substrate 34, and a half mirror 50 is fixed to this. 28 is a line scanner camera located directly above the half mirror 50 and fixed to the substrate 44, and in its light path, approximately 1000 minute photodetecting elements are arranged in a length of 26 mm. Photodetecting sections 54 configured in a linear arrangement are arranged. 56 is a holder fixed to the substrate 44, and a half mirror 58 is fixed to this. A lens system 60 is disposed on the substrate 44 between the half mirrors 50 and 58. Reference numeral 30 denotes an ITV camera fixed to the substrate 44, and its light entrance portion is located directly above the half mirror 58. The ITV camera 30 constitutes a projection means for projecting a predetermined range on the table 10 together with an index 32 on a screen provided at a predetermined position. 64
is a lens system, 66 and 68 are reflection lines, and 70 is a substrate 4.
This is a commercially available lens barrel that is screwed into the screw hole No. 4, and a lens system (not shown) is disposed inside the lens barrel. Reference numeral 88 denotes a holder placed on the inner bottom surface of the tube body 74, and an index plate 92 on which the index 32 is drawn on transparent glass is fixed to this holder. 94 is a light bulb, the light of which passes through the index plate 92 to the ITV.
When light enters the camera 30, the half mirror 5
The 10 surfaces of the table are irradiated through steps 8 and 50. The light on the surface of the table 10 is configured to enter the scanner camera 28 through a half mirror 50.

FIG. 4 is a block circuit diagram of an automatic coordinate reading device mainly built into the controller. In the figure, 40 and 40a are counters that count the amount of movement of the head 24 in the XY coordinate axis directions, 102 is an arithmetic circuit, and 104 is a Hole judgment circuit, 106 is a register, 108 is a data file memory, 110 is a read data counter, 112 is an X maximum value calculation circuit,
114 is a Y maximum value calculation circuit, 116 is an X maximum value register, 118 is a Y maximum value register, 120 is a comparator, 122, 124 are calculation circuits, 126, 12
8 is a comparator, 130 is an upper limit value setter, 132 is a lower limit value setter, 134, 136, 138 are AND gates, 140 is a center point calculation logic circuit, 142
is the NG data file memory, 144 is the doubt data file memory, 146 is the collect data file memory, 148 is the changeover switch, 150 is the switch data controller, 152 is the operation console 3
4 is a data in switch, 154 is a skip switch, and 156 is a logic gate circuit.

Next, the operation of this embodiment will be explained. When the detection section 54 scans the printed circuit board original drawing film 160 by moving the head 24 under the control of the controller, the digitized signal of the detection section 54 is sent to the hole determination circuit 104, where the hole mark 4 (sixth hole mark 4) is scanned.
It is determined that the hole (see figure) is a white hole surrounded by a black background, and the circuit 104 outputs "1". on the other hand
The count output signal of the XY counter 40 and the digitized signal of the detection unit 54 are sent to the arithmetic circuit 102, where the Y coordinate values YE, YS of both ends of the hole mark 4 in the Y coordinate axis direction and the X Coordinate values XE and XS are calculated, and these calculated values are input to register 106. Contents of register 106
XE, XS, YS, and YE are sent to the data file memory 108 and stored therein by the "1" pulse output of the hole determination circuit 104. The contents of the data file memory 108 are then sequentially read out to and counted by the read data counter 110. data counter 1
The 10 count values XE, XS, YE, YS are sent to the maximum value calculation circuit 112, where the maximum value XLm of the hole mark 4 in the X-axis direction is calculated. On the other hand, the maximum value calculation circuit 114 calculates the maximum value YLm of the hole mark 4 in the Y coordinate value direction based on the data from the data counter 110. On the other hand, data counter 1
10 is input to the center point calculation logic 140, where the XY coordinate values of the center point e of the hole mark 4 are calculated, and the calculated data is input to the AND circuit 13.
4,136,138. On the other hand, the contents of the XY maximum value registers 116 and 118 are
If XLm≧YLm, XLm/YLm (assumed to be 1.5 in this embodiment) is calculated by the calculation circuit 122 and input to the comparator 126. The comparator 126 is
XLm/YLm as a parameter of the upper limit value setter 130
Pm is compared with, for example, 3, and if Pm<XLm/YLm, the AND gate 134 is made conductive and the read center point data of the hole mark 4 is filed in the NG data file memory 142. In this example
Since Pm>XLm/YLm, the data of XLm/YLm is input to the comparator 128, where it is compared with the parameter Ps of the lower limit value setter 132, for example, 1.1.
If Ps>XLm/YLm, the hole mark data is filed in the collect data file memory 146. In this embodiment, since Ps<XLm/YLm, the comparator 128 supplies a signal of 1 to the AND gate 136. As a result, the data of the center point of the hole mark 4 is filed in the doubt data file memory 144. In this way, hole marks such as hole mark 4 having an inaccurate shape are sequentially detected, and data on their center points are filed in the doubt data file memory 144. The center point data of the hole mark with the correct shape is filed in the collect file memory, and the pattern that is significantly different from the shape of the hole mark is filed in the NG data file memory 142. When the automatic coordinate reading operation is completed, the switch 148 is operated to connect the doubt data file memory 144 to the switch data controller 150. As a result, the center point coordinate data of the doubt data file memory 144 is sequentially supplied to the control section of the numerical controller 26, which drives the head 24 and
2 is brought to the reading point e of the doubt hole mark 4. The operator determines the center point g that is assumed when the doubt hole mark 4 is corrected to have an accurate shape.
is measured visually, the switch 38 is operated to align the center of the index 32 with the center point g, and then the data-in switch 152 of the console 34 is turned on.
As a result, the content of the counter 40a, that is, the point on the table 10 indicated by the center of the index 32 is determined.
The XY coordinate values are input to the collect data file memory 146 via the gate 156. In addition, the XY coordinate reference of the index 32 and the line scanner camera 2
The XY coordinate standards of the detection unit 54 of No. 8 are made to coincide with each other in advance. When one operation is completed, the switch data controller 150 supplies the next data from the doubt data file memory 144 to the control section of the numerical controller 26. In this way, the center point coordinate data of all hole marks that do not have a normal shape are corrected, and the data is stored in the collect data file memory 146.
File it to . Note that when the skip switch 154 is pressed, the next data is supplied from the doubt data file memory 144 to the numerical controller 26. Also, turn the selector switch 148 to the opposite side
The data file memory 142 is transferred to the controller 15
If connected to 0, NG data file memory 14
Based on the data in step 2, the numerical controller 26 can be driven, and the index 32 can be aligned with the non-hole mark.
You can check NG data. Note that there are various conditions for detecting that the hole mark does not have a normal shape, and the conditions are not particularly limited to those shown in this embodiment.

Since the present invention is configured as described above, there is an advantage that even if the shape of the hole mark is inaccurate, accurate XY coordinate data of the center point can be obtained.

[Brief explanation of drawings]

Fig. 1 is an overall external view of the automatic reading device, Fig. 2 is an external view of the operation console, Fig. 3 is a sectional view of the coordinate reading head, Fig. 4 is a block circuit diagram, and Fig. 5 is a printout. The front view of the original film, FIG. 6, is an explanatory diagram. 10...table, 12,14...X rail,
16, 18...X cursor, 20...Y rail,
22...Carrier, 24...Coordinate reading head, 26...
...Numerical controller, 28...Line scanner camera,
30...ITV camera, 32...index, 34...
Operation console, 36...screen, 38...manual operation switch, 40, 40a...counter, 144...doubt data file memory, 146...collect data file memory.

Claims (1)

[Claims] 1 A counter that relatively numerically controls a coordinate reading head equipped with a scanner camera along the XY coordinate axes on the table, scans the drawing on the table with the scanner camera, and counts the amount of movement of the coordinate reading head in the XY coordinate axis directions. Based on the output of and the detection signal of the scanner camera, calculate the XY coordinate values of each center point of the plurality of hole marks in the drawing,
In an automatic coordinate reading device that stores the calculated data in a data file memory, a projection means is provided in the coordinate reading head for projecting a predetermined range on the table together with an index on a screen placed at a predetermined position. a means for storing coordinate data of a center point of a hole mark having a predetermined shape among the hole marks into a collect data file memory; and detecting a doubt hole mark that does not satisfy a predetermined shape condition among the hole marks. means for filing the XY coordinate values of the center point of the doubt hole mark in a doubt data file memory; and driving the coordinate reading head by the data in the doubt data file memory to locate the center of the index at the doubt hole mark. means for matching the center point of the hole mark; a manual operation switch for driving the coordinate reading head in any XY direction; An automatic coordinate reading device characterized by comprising a data input switch for manual operation for storing files in a file memory.