JPH0121387Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automatic coordinate reader for automatically reading the XY coordinate values of the center point of a mark on a drawing on a table by scanning the drawing with a scanner camera.

In automatic coordinate readers, when the amount of light entering the scanner camera falls below a certain level or exceeds a certain level, errors occur in the recognition of marks on drawings, and this causes errors in reading coordinate values.

The present invention aims to eliminate the above defects.

The configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In FIG. 1, a table 4 is composed of a frame and a transparent plate, and both ends are supported by a base 6. Reference numerals 8 and 10 indicate X rails, and rack gears are carved along the longitudinal direction on the sides of these rails. 12 and 14 are X cursors, and Colo 1
It is movably connected to the X rails 8 and 10 via 3. X motors 16 and 18 are attached to the X cursors 12 and 14, respectively.
Pinion gears 20, 22 connected to the output shaft of 18
meshes with the rack gear. Reference numeral 24 denotes a Y rail installed over the X cursors 12 and 14, and a carrier 26 is movably attached to this. When the Y motor 28 attached to the carrier 26 is driven, the carrier 26 moves along the Y rail 24 and
When the motors 16 and 18 are driven, the X cursor 1
2 and 14 are configured to move along the X rails 8 and 10. 30 is X cursor 12,1
This is the rail built at 4, and the cursor 3 is placed on it.
2 is movably attached. The carrier 26
The cursors 32 and 32 are connected to each other so as to move in the same direction by wire ropes 34, 36, 38, and 40 that are stretched around double pulleys rotatably supported by the X cursors 12 and 14. The motors 28, 16, 18 are configured to be controlled by a controller. The carrier 26 includes:
A reading head 42 is attached and an illumination head 44 is attached to the cursor 32. table 4
An operation console 46 disposed adjacent to the mounting head 4
A manual operation switch 48 is provided for driving the table 2 to any desired position on the table 4. The mechanism for movably supporting the heads 42 and 44 in conjunction with each other in any direction relative to the table 4 is the same as that of numerically controlled XY automatic drafting machines, automatic cutting machines, etc. Since the configuration is well known, detailed explanation thereof will be omitted.

Next, the structure of the reading head 42 will be explained with reference to FIG.

50 is a cylinder fixed to the substrate 42a, and a commercially available lens cylinder 52 is fixed to this. A lens system (not shown) is arranged inside the lens barrel 52. Reference numeral 54 denotes a holder fixed to the substrate 42a, and a half mirror 56 is fixed to this so as to be inclined at an angle of 45 degrees in the left rotation direction in the figure with respect to the table 4 surface. 58 is half mirror 56
A line scanner camera is located directly above the 42a and is fixed to the 42a, and its light path includes approximately
A photodetection section 60 is arranged in which 1000 minute photodetection elements are linearly arranged within a length of 26 mm. Reference numeral 62 denotes a mounting plate mounted on the holder 54, and a half-moon-shaped window 64 is formed in a portion of the mounting plate located directly below the photodetector 60. A bracket 66 is fixed to the mounting plate 62 in the vicinity of the window 64, and a light amount detector 68 is supported on this bracket. A through hole 70 is formed in the mounting plate 62 directly below the light amount detector 68 . The through hole 70 is located in the path of the light transmitted through the half mirror 56. 62a is a shielding plate. A holder 76 is fixed to the substrate 42a, and a half mirror 78 is fixed to this.
The half mirror 78 is similar to the half mirror 56.
It is set on the side at the same height and angle of inclination as this. A lens system 80 is disposed on the substrate 42a between the half mirrors 56 and 78. Reference numeral 82 denotes an ITV camera fixed to the substrate 42a, and its light entrance portion is connected to the half mirror 7.
It is located directly above 8. 84 is half mirror 7
A lens system 86 is located directly under the lens system 84 and fixed to the substrate 42a, and 86 is a reflecting mirror located directly below the lens system 84 and fixed to the substrate 42a. It is inclined at 135°. 8
Reference numeral 8 denotes a reflecting mirror fixed to the substrate 42a on the side of and opposite to the reflecting mirror 86, and the mirror surface of this mirror is inclined at 45 degrees in the counterclockwise rotation direction in the figure with respect to the table 4. 90 is a commercially available lens barrel that is screwed into a screw hole in the substrate 42a, and a lens system (not shown) is disposed inside this barrel. 92 is the substrate 42
It is a cylindrical body that is screwed into the screw hole a, and the tube 9 is attached to this
The small diameter portions of No. 4 are rotatably fitted. Pipe body 94
A shaft rod 96 with a knob that is screwed into a screw hole is slidably fitted into an elongated hole 98 provided transparently in the circumferential direction of the cylinder 92, and the flange of the shaft rod 96 is fitted on the outer periphery of the cylinder 92. It is pressed against the surface. The side wall of the large diameter portion of the tube body 94 is provided with screw holes in four directions, and screws 10 are inserted into the screw holes.
0 are screwed together. Reference numeral 102 denotes a holder placed on the inner bottom surface of the tubular body 94, and an index plate 106 on which an index 104 is drawn on transparent glass is fixed to this holder. A pedestal is in contact with the four sides of the side wall of the holder 102, and the tip of the screw 100 is rotatably connected to the pedestal. 108 is a tube fixed to the tube 94, and a polarizing filter 1 is attached to this.
10 is fixed. 112 is the tube body 108
A polarizing filter 114 and a lens system 116 are fixed to this tubular body which rotatably fits into the inner circumferential surface of the lens. The tubular body 112 is fixed to the tubular body 108 with screws. 120 is a lamp case fixed to the tube body 112, a socket is fixed to this, and a light bulb 122 is attached to the socket. A light source lamp 124 is attached to the illumination head 44, and the light from the light source lamp 124 is condensed onto the back surface of the table 4 directly above the head 44 by a condenser lens 126 attached to the head 44. ing. FIG. 6 is a block diagram of the light intensity deterioration detection circuit of the light source lamp 124. In the figure, 130 is a dimmer, and the light intensity control section includes comparators 132 and 13.
4 are connected, and the dimmer 130 is connected to a power source via a transformer 136 by known means. 138 is a dimming upper limit light amount indicator, 14
0 is a dimming lower limit light amount designator, 142 is a maximum light amount indicator, 144 is a minimum light amount indicator, 146 and 148 are comparators, 150 is a timer circuit, 152 is an AND circuit, 154 is an OR circuit, 156 is an alarm, 15
8 is a controller, and these are connected as shown in the figure.

Next, the operation of this embodiment will be explained.

The light from the light bulb 122 enters the ITV camera 82 through the lens system 116, polarizing filters 114, 110, index plate 106, lens system in the lens tube 90, reflector 88, reflector 86, lens system 84, and half mirror 78. The image of the index 104 on the index plate 106 is projected on the cathode ray tube of the operation console 46. On the other hand, a light image of a 10 mm long linear portion of the printed circuit board original film on the table 4 below the lens tube 52 is transmitted to the line scanner camera 5 by the light source lamp 124 via the lens system and the half mirror 56.
At the same time, the lamp 1
The light image near the center of the read portion of the film is reflected by the half mirror 56 and enters the ITV camera 82 via the lens system 80 and the half mirror 78. death,
The vicinity of the center of the read portion of the original film is displayed on the cathode ray tube. The pattern of the linear read portion of the original film is converted into a digitized signal by the photodetector 60 and sent to the controller 158. Under the control of the controller 158, the head 42 is reciprocally scanned over the original film in a direction perpendicular to the longitudinal direction of the detecting section 60, and for each scanning movement, the head 42 is moved in the direction along the longitudinal direction of the detecting section 60. The head 42 is advanced one by one, and the entire surface of the original film is scanned by the detection section 60. By this scanning, the pattern of the original film is digitized, and a program is input to the controller so that the XY coordinate values of the center point of the mark to be read are output from the controller 158 to the output device. The head 44 moves in conjunction with the movement of the head 42 along the table 4, and the light source lamp 124 always illuminates the scanning section of the scanner camera 58. The output value of the light amount detector 68 that detects the light amount of the light source lamp 124 decreases,
When the light level falls below the set value of the light control lower limit light amount indicator 140, the comparator 134 outputs a signal of "1", and upon receiving this signal, the dimmer 130 switches the light source lamp 124
Increase the illuminance. Further, when the output value of the light amount detector 68 increases and exceeds the set value of the dimming upper limit light amount indicator 138, the comparator 132 outputs a signal of "1", and in response to this signal, the dimmer 130 The illuminance of the light source lamp 124 is lowered to maintain the light amount of the light source lamp 124 at a constant level. When the output value of the light intensity detector 68 exceeds the set value of the maximum light intensity indicator 142 due to deterioration of the light source lamp 124 or other failure causes, the comparator 146 outputs a signal of "1", and this signal is activated by the alarm. 156 and activates the alarm 156 to notify that the light source lamp 124 is out of order. Additionally, the output signal of comparator 146 is sent to controller 158, which connects heads 42 and 44.
Stops driving. When the output value of the light intensity detector 68 becomes less than the set value of the minimum light intensity indicator 144 due to deterioration of the light source lamp 124, the comparator 148 outputs a signal of "1", and this signal passes through a timer circuit and is output for a predetermined period of time. After elapse of time (for example, 5 seconds) alarm 1
56 and controller 158. Note that the output signal of the comparator 148 becomes "0" before a predetermined time elapses.
Then, the gate of the AND circuit 152 is closed, and the output signal of "1" from the timer circuit 150 is cut off by the AND circuit 152. As is clear from the above description, the indicators 142, 144 and the comparator 14
Reference numeral 6,148 constitutes means for outputting an output signal when the light amount detection value of the light amount detector 68 reaches a predetermined value. Note that this means is not particularly limited to the configuration shown in the drawings. The above dimming upper limit light amount indicator 13
8. The setting values of the dimming lower limit light intensity indicator 140, maximum light intensity indicator 142, and minimum light intensity indicator 144 are set in advance as appropriate, taking into account the light intensity required for automatic coordinate reading, the light intensity when the light source lamp 124 deteriorates, and other conditions. Set it. In addition, when implementing this proposal, the dimmer 13
0. The timer circuit 150 may not be used, and only the alarm 156 or only the controller 158 may be operated when the light source lamp is abnormal.

As mentioned above, this invention uses a light transmission type lighting fixture that illuminates from the back side of the transparent table.
The graphic pattern on the film can be clearly highlighted and the pattern can be read accurately. Also, if the illuminance of the light entering the scanner camera deviates from a certain range from the drawing on the table,
Since the alarm sounds or the reading operation is stopped, it is possible to prevent malfunctions in the automatic coordinate reading operation.

Furthermore, since the lighting equipment is moved at the same time as the scanner camera, there is an effect that the capacity of the lighting equipment can be reduced.

[Brief explanation of the drawing]

Figure 1 is a schematic explanatory diagram of the automatic coordinate reader, Figure 2 is an external view of the operation console, Figure 3 is a sectional view of the reading head, Figure 4 is a plan view of the holder, and Figure 5 is A-A.
The line sectional view and FIG. 6 are block circuit diagrams. 4...Table, 16, 18...X motor, 2
6... Carrier, 32... Cursor, 42... Reading head, 44... Illumination head, 56... Half mirror, 58... Line scanner camera, 60... Light detection unit, 66... Bracket, 68... ...Light level detector, 82...ITV camera, 86...Reflector, 8
8...Reflector, 124...Light source lamp, 130...
...Dimmer, 132,134...Comparator.

Claims (1)

[Scope of utility model registration request] A scanner camera 58 is moved relatively and automatically with respect to the upper surface of the transparent table 4, the scanner camera 58 scans the drawing on the table 4, the pattern of the drawing is converted into a digitized signal, and the transparent table 4 is A lighting fixture is disposed below the scanner camera 58 and the lighting fixture is connected so that the light from the lighting fixture is irradiated onto the lower surface of the part facing the scanner camera 58 in the drawing, so that both of the scanner camera 58 and the lighting fixture are interlocked with each other. A light amount detector 68 configured to allow the light that has passed through the transparent table 4 of the lighting fixture to enter the scanner camera 58 and detect the amount of light that enters the scanner camera 58; 1. An automatic coordinate reader, comprising: means for outputting an output signal when a detected value reaches a predetermined value; and when the means outputs an output signal, an alarm or the like is activated.