JPH074038U - Position shift detector - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide an easy-to-use position deviation detecting device used for a positioning device or the like. [Structure] Two television cameras 1a and 1b controlled by a synchronization signal, camera control units 2a and 2b for controlling each camera, an image superposing device 3 and a monitor television 4 are included.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for detecting a displacement of an installation position such as screen printing or a mounting device.

[0002]

[Prior art]

 Conventionally, in the case of overprinting in screen printing or the like, the alignment of the printed matter and the printing original plate has been performed by repeating several test prints before the main printing. Therefore, there are problems to be solved such as long preparation work time, skill required, and empirical confirmation of alignment accuracy.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention can use two or more television cameras (hereinafter, simply referred to as cameras) and a monitor for displaying the image to visually confirm and measure the positional deviation in a digital or analog manner. The problem is to provide a displacement detection device.

[0004]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and the first invention is to provide a plurality of cameras controlled by synchronous signals, a clamp circuit for clamping output signals of the cameras, and at least each clamp. It is a positional deviation detecting device comprising a signal processing circuit having an adding circuit for adding the output signals of the circuit, and a monitor for displaying a composite image of images from the respective cameras by the output signal of the signal processing circuit.

A second invention is to provide a plurality of cameras controlled by a synchronization signal, a clamp circuit for clamping the output signal of each camera, a signal processing circuit for the output signal of each clamp circuit, and an output of this signal processing circuit. The signal processing circuit includes a monitor controlled by a signal and a digital or analog indicating means, and the signal processing circuit includes a first addition circuit and a subtraction circuit of the output signal of the clamp circuit, and an absolute value of the output signal of the subtraction consultation. For obtaining the absolute value circuit, a second adding circuit for adding the output signals of the absolute value circuit and the first adding circuit, and outputting the output signal to the monitor, and the absolute value circuit of the absolute value circuit. A positional deviation detecting device comprising an integrating circuit for multiplying outputs and a peak hold circuit for outputting a peak value of an output signal of the integrating circuit to the instructing means.

[0006]

[Action]

 According to the first invention, the clamp circuit equalizes the reference voltage levels of the output signals of the cameras, and the images from the cameras are superimposed and displayed on the monitor via the signal processing circuit.

According to the second invention, the video output signal of each camera is detected by the subtraction circuit of the signal processing circuit to detect the signal of the portion where the images of the cameras are not superposed, that is, the shift portion, and the absolute value circuit detects the signal. The signal is converted into a signal suitable for digital or analog indication, then converted into a signal corresponding to the image shift amount by the integrating circuit, and the stable shift amount is displayed by the digital or analog indicating means through the peak hold circuit. Also, since the images from each camera are displayed on the monitor image as in the first invention, the absolute value signal corresponding to the portion where the images do not overlap is added to the image composite signal by the second addition and depression. , The contrast between the overlapping and non-overlapping parts of the image displayed by each camera on the monitor screen is enhanced, and the visual deviation of the image is clearly displayed.

[0008]

【Example】

 FIG. 1 shows a first embodiment of the present invention. Objects A and B (for example, a printed matter and a printing original plate) are imaged by black and white or color cameras 1a and 1b, and the video signals thereof are input to camera control units 2a and 2b. Also, the image of the objects A and B is input to the monitor television 4 (hereinafter referred to as monitor television) via the image superposing device 3 (signal processing circuit), and the images of the objects A and B are displayed on the monitor television 4.

FIG. 2 shows an example of an image displayed on the screen of the monitor television 4, and is a case where the objects A 1 and B 2 are not placed at the same position with respect to the camera. In this case, since the deviation between the objects A and B can be clearly discriminated on the monitor television screen, for example, when A is used as a reference, the position can be easily adjusted by moving B. It is also possible to check and measure dimensional errors.

When this embodiment is applied to screen printing, for example, the cameras 1a and 1b and the printed matter are arranged at predetermined positions, and the set of the screen original plate B is positioned by looking at the image on the monitor TV 4. Then, if the screen original plate B is overlaid and printed on the printed material A, screen printing can be performed without misalignment.

FIG. 3 shows the configuration of the image superimposing apparatus 3 shown in FIG. 1. The image superimposing apparatus 3 includes a front circuit 31, an arithmetic circuit 32, and a synchronization signal generating circuit 35, and the front circuit 31 is a camera. A pair of clamp circuits 31a and 31b are provided, and the video signal of each camera becomes a signal having the same voltage reference level by this clamp circuit.

The arithmetic circuit 32 is provided with a signal addition circuit 33 and a ratio variable circuit 34, and the addition circuit 32 has the following characteristics.

[(Video signal of camera 1) + (video signal of camera 2)] / 2

The sync signal generation circuit 35 is provided for synchronizing the operation of the cameras 1 and 2, and the ratio conversion circuit 34 increases the total mixing ratio of the video signals of the camera 1 and the camera 2 to 200%. It has a function that can be adjusted.

With the above circuit configuration, the images of the camera 1 and the camera 2 are displayed in an overlapping manner on the screen of the monitor TV 4, and the ratio of each image can be changed, which is very effective for confirming the position of the image. Is.

FIG. 4 shows a different embodiment in which a large number of cameras 1a to 1n are used. The front circuit 31 is provided with clamp circuits 31a to 31n corresponding to the number of cameras, and an arithmetic circuit 32 '. Is configured as shown in FIG.

That is, in this case, since a large number of image signals are overlapped, in order to make the confirmation on the monitor TV 4 easier, as shown in FIG. In addition, a subtraction circuit 38 for obtaining the voltage difference, an absolute value circuit 37 for making the positive and negative directions of the voltage difference constant, and a second addition circuit 39 for adding its output to the sum signal of the respective signals are provided. A video signal is input to the monitor television 4 via the monitor.

With this configuration, the overlapping portions of the video signals of a large number of cameras can be emphasized, so that the recognition can be performed more effectively. Also, since the output of the absolute value circuit 38 is the output of the non-overlapping portion, the degree of overlap is displayed by the integrating circuit 40 and the peak hold circuit 41 by an analog or digital indicating instrument such as a panel meter. be able to.

Since the output signal of the camera is a composite signal including a synchronization signal, a noise signal may be generated during the calculation. However, the gate generation circuit 42 does not calculate unnecessary signal parts. It is not supposed to be done. This method is also effective for two cameras.

FIG. 6 shows an embodiment in which a color camera is used. Since color signals of three systems are output from the color cameras 11a and 11b, a clamp circuit 31 ′ and an arithmetic circuit 32 are provided for each system. By arranging the above, it is possible to display on the color monitor television 4 ′ a superimposed image in which the difference in chromaticity as well as the brightness is clearly displayed, which is very effective.

[0021]

[Effect of device]

 According to the first invention, the relative positional deviation of the objects A and B with respect to the camera can be accurately known by the naked eye, which is extremely useful as a positional deviation detecting device for the positioning device in screen printing and mounting devices. Further, according to the second invention, not only the display on the monitor television screen but also the degree of the positional deviation by the analog or digital indicating instrument can be displayed quantitatively.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of an image displayed on the screen of the monitor television according to the first embodiment of the present invention.

[Figure 3]

FIG. 4 is a block diagram of a second embodiment of the present invention.

FIG. 5 is a block diagram showing details of an arithmetic circuit according to a second embodiment.

FIG. 6 is a block diagram of a third embodiment when a color camera is used.

[Explanation of symbols]

 1a, 1b camera 2a, 2b camera control unit 3 image superimposing device 4 monitor television 31 front-end circuit 31a, 31b clamp circuit 32 arithmetic circuit 33 adder circuit 34 ratio variable circuit 35 synchronization signal generation circuit

[Procedure amendment]

[Submission date] December 28, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of an image displayed on the screen of the monitor television according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing details of the image superposing apparatus in the first embodiment.

FIG. 4 is a block diagram of a second embodiment of the present invention.

FIG. 5 is a block diagram showing details of an arithmetic circuit according to a second embodiment.

FIG. 6 is a block diagram of a third embodiment when a color camera is used.

[Explanation of reference numerals] 1a, 1b camera 2a, 2b camera control unit 3 image superimposing device 4 monitor television 31 pre-circuit 31a, 31b clamp circuit 32 arithmetic circuit 33 adder circuit 34 ratio variable circuit 35 synchronization signal generation circuit

Claims (2)

[Scope of utility model registration request] 1. A signal processing having a plurality of television cameras controlled by synchronization signals, a clamp circuit for clamping a video output signal of each television camera, and an addition circuit for adding at least output signals of the respective clamp circuits. A misregistration detection device comprising a circuit and a monitor that displays a composite image of images from each television camera according to an output signal of the signal processing circuit. 2. A plurality of television cameras controlled by synchronization signals, a clamp circuit for clamping the output signals of each television camera, a signal processing circuit for the output signal of each clamp circuit, and an output signal of this processing circuit. And a digital or analog indicating means, and the signal processing circuit obtains the absolute value of the output signal of the subtraction circuit and the first addition circuit and subtraction circuit of the output signal of the clamp circuit. Therefore, the absolute value circuit, the absolute value circuit and each output signal of the first addition circuit are added,
A second adding circuit for outputting the added signal to the monitor, an integrating circuit for integrating the output of the absolute value circuit, and a peak hold circuit for outputting the peak value of the output signal of the integrating circuit to the indicating means. Displacement detection device characterized by