JPH01161310A - Two-light source rapid switching shutter device for image processing - Google Patents

Abstract

PURPOSE:To easily speed up a shutter device by rotating a disk having a shutter window at a seed having common timing with a video vertical synchronizing signal from an image pickup part to switch the projection of light in the X axis direction and light in the Y axis direction to an object to be inspected. CONSTITUTION:The title device is provided with the disk 3 to be optionally rotated at a position crossing the optical paths A, B of two light sources 1, 2 in the X and Y axis directions, a detecting means 4 for detecting the rotating position of the shutter window 14 formed on the disk 3 in accordance with the rotation of the disk 3 and signal generating means 5-7 for generating signals instructing the image pickup of the image of an object 13 to be inspected to which light in the X or Y axis direction is projected in accordance with the rotating position of the disk 3. Since the switching is executed by simple operation, i.e. rotation, the structure can be simplified and rapid operation can be easily executed, so that the title device can be sufficiently satisfied with the conditions of performance, service life and price.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a two-light source high-speed switching shutter device for image processing. It is used as a device for rapidly switching the projection of light in the X-axis direction and Y-axis direction from two light sources when necessary.

<Prior art> When using the optical cutting method as a method of inspecting whether the mounting position of a chip component mounted on a printed circuit board is correct, the chip component is irradiated with slit light from two directions. In order to increase the intensity, it is necessary to irradiate each direction individually. In this case, a common method is to switch the light source using a shutter.

Devices that can switch the projection of light in the X-axis direction and the Y-axis direction at high speed have conventionally been devices that use an aperture-type mechanical lens shutter as shown in Figures 9 (a) and (b), liquid crystal elements, or ceramic devices. A device that uses a xenon light emitting element (generally a strobe) as a light source instead of a shutter.
There were some that used .

<Problems to be Solved by the Invention> In the above-mentioned aperture type mechanical lens shutter, there are many parts that perform complicated operations, so there are problems in terms of operating speed and lifespan.

In addition, high-speed shutters using liquid crystal elements or ceramic elements have a problem in that the amount of light passing through them changes significantly with changes in temperature, making it difficult to use them close to a heat generating element such as a light source. Furthermore, those using xenon light emitters have the drawback of being expensive, although they are satisfactory in terms of both the amount of light and the lifespan.

As described above, none of the conventional devices was satisfactory in all aspects of performance, lifespan, and cost.

<Means for Solving the Problems> The two-light source high-speed switching shutter device for image processing according to the present invention includes a disk that is rotatable at a position crossing two optical paths of light in the X-axis direction and the Y-axis direction; A detection means for detecting the rotational position of a shutter window provided on the disk according to the rotation of the disk, and an inspection object onto which light in the X-axis direction or Y-axis direction is projected depending on the rotational position of the disk. and signal generating means for generating a signal instructing to capture the image.

<Operation> The two-light source high-speed switching shutter device for image processing according to the present invention rotates a disk having a shutter window at a speed that has a common timing with the video vertical synchronization signal of the imaging unit,
The projection of the light in the X-axis direction and the light in the Y-axis direction onto the object to be inspected is switched at high speed.

<Example> FIG. 1 shows the configuration of this example. In the figure, 1
．． 2 is a light source, 3 is a disk, 4 is a rotational position sensor, 5 is a signal generation circuit, 6 is a main processing circuit, 7 is a memory, 8 is a solid-state imaging camera (COD camera), 9.10 is a reflection part, 11 is a A motor, 12 a transmission mechanism, and 13 a surface to be inspected.

When a plane parallel to the surface to be inspected 13 is imagined closer to the solid-state imaging camera 8, the light source 1.2 is provided with two light sources perpendicular to each other on this virtual plane.
Slit lights are respectively generated to be projected on the axes (X-axis, Y-axis).

The disk 3 is rotatably pointed at a position crossing the optical paths A and B from the two light sources 1 and 2 to the surface 13 to be inspected. The rotational position sensor 4 detects the rotational position of the disc 3.

The signal generation circuit 5 detects the disc 3 detected by the rotational position sensor 4.
An external synchronization signal (vertical synchronization signal, horizontal synchronization signal) is output to the solid-state imaging camera 8 according to the rotational position of the solid-state imaging camera 8.

The main arithmetic circuit 6 performs various arithmetic processes on the image data of the inspection object captured by the solid-state imaging camera 8. The signal generation circuit 5 receives the signal from the main arithmetic circuit 6, inputs the signal from the rotational position sensor 4, and then re-generates the vertical synchronization signal after timing TA has elapsed. memory 7
stores image data captured by the solid-state imaging camera 8.

The solid-state imaging camera 8 captures an image of the inspection target surface 13 from the normal direction of the inspection target surface 13, and accumulates this image for a certain period of time. This solid-state imaging camera 8 can be externally synchronized.

The reflecting section 9.10 reflects the slit light from the light source 1.2 and guides it to the surface 13 to be inspected. The motor 11 is a transmission mechanism 1
The circle tIIi3 is rotationally driven through 2.

FIG. 2 shows the structure of the disc 3. One shutter window 14 is formed in the disc 3. This shutter window 1
4 is a fan shape coaxial with the disk 3. Portions 15 and 16 shown by virtual ellipses schematically show cross sections of the slit light on the disk in the X-axis direction and the Y-axis direction, respectively. According to the rotation of the disk 3 and therefore the rotation of the shutter window 14, the optical path 15 and the optical path 16 are alternately blocked.

The disc 3 rotates at approximately 90 Orpm (in the video signal of the solid-state imaging camera 8, the period of the vertical synchronizing signal is approximately 33.4 milliseconds per field, and the disc 3 rotates 0.5 times in this period). rotational speed).

FIG. 3 shows the front structure of the rotational position sensor 4, and FIG. 4 shows its side structure. The disc 17 is the disc 3
It is fixedly mounted on a common rotating shaft.

This disc 17 is provided with an opening 20 at one location on its peripheral edge.

Photoswitches 1 are installed near two locations on the circumferential edge of the disk 17.
8.19 is installed. The aperture 20 rotates in accordance with the rotation of the disk 17, and this aperture 20 is connected to the photoswitch 18.
19, the photoswitches 18 and 19 each output a signal.

FIG. 5 shows the relationship between the arrangement of the disk 3 and the rotational position sensor 4 and the optical path.

The disk 3 is arranged at a position that crosses both optical paths A and B, which are perpendicular to each other in the X-axis direction and the Y-axis direction. Therefore, when the disk 3 rotates and the shutter window 14 comes to a position where it crosses the optical path A, the slit light in the X-axis direction passes through the shutter window 14, passes through the reflection section 9 (FIG. 1), and then reaches the surface to be inspected 13. reach. At this time, the optical path B is blocked by the disk 3,
The slit light in the Y-axis direction does not reach the inspection target surface 13.

When the shutter window 14 comes to a position where it crosses the optical path B, the slit light in the Y-axis direction passes through the shutter window 14 and passes through the reflection section 1.
0 and reaches the inspection target surface 13. At this time, the optical path A is blocked by the disk 3, and the slit light in the X-axis direction does not reach the inspection target surface 13.

The operation of this shutter device will be explained below. 6th
The flowchart in the figure shows the operating procedure, and FIG. 7 shows the timing chart of the signals of this shutter device.

The method for capturing an image is to first detect which optical axis, the X-axis (V) or the Y-axis (H), is open using the rotational position sensor 4 (step #1). When the signal from the rotational position sensor 4 is input, the solid-state imaging camera 8 accumulates an image during the current field. Rotational position sensor 4
It is determined whether the axis is the X axis or the Y axis based on the signal (#2), and image data is stored in a predetermined frame memory according to the result of this determination (#3, #7). When the storage period ends, a signal is output from the frame memory (#4.
#8). Upon receiving this signal, the image when the slit light in the other axis direction is projected is taken into the frame memory (#5, #9).

Here, both image data when the slit light is projected in the X-axis direction and the Y-axis direction are stored in the memory.

When the second retention period end signal is output from the frame memory (#6, #10), image calculation processing is executed (#12). Furthermore, when this retention period end signal is output, the signal generation circuit 5 re-generates the video synchronization signal TA milliseconds after the next signal input from the rotational position sensor 4 (#15). (#16). The restart of this video synchronization signal is limited by the number of rotations of the motor 11, but if the rotation accuracy of the motor 11 is good, it is sufficient to apply a - degree start. However, in order to improve the rotational accuracy, since motors are expensive, it is best to use an inexpensive motor that does not have high rotational accuracy and increase the number of starts.

Figure 8 shows the disk 3 corresponding to the timing chart in Figure 7.
This figure schematically shows the rotational position of .

FIG. 10 shows a signal timing chart when a conventional aperture-type mechanical lens shutter is used. In comparison, as is clear from the timing chart in FIG. 7, the shutter device according to the present invention has a high speed. It can be seen that this has been achieved.

<Effects of the Invention> According to the present invention, since the operation is a simple rotation, the structure is simple and the speed can be easily increased.
It is possible to provide a shutter device that satisfactorily satisfies the requirements of lifespan and price.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing the structure of a disk in the embodiment of the present invention, and FIG. 3 is a diagram showing the planar structure of the rotational position sensor of the embodiment of the present invention. FIG. 4 is a diagram showing the side structure of FIG. 3, FIG. 5 is a diagram explaining the relationship between the disk and the optical path in the embodiment of the present invention, and FIG. 6 is a flowchart showing the operation procedure of the embodiment of the present invention. Fig. 7 is a diagram showing the signal waveform of the embodiment of the present invention, Fig. 8 is a diagram illustrating the relationship between the rotational position of the disc and the optical path in the embodiment of the invention, and Fig. 9 is a diagram showing the structure of the conventional example. , FIG. 10 is a diagram showing a signal waveform of a conventional example. 1.2...Light source 3...Disk 4...Rotation sensor 5...Signal generation circuit 6...Main calculation circuit 7... ... Memory 8 ... Solid-state imaging camera 9.10 ... Reflector 11 ... Motor 12 ... Speed change mechanism 13 ... Surface to be inspected Patent applicant Sharp Co., Ltd. Agent Patent Attorney Nishi 1) New construction Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Projection of light from two light sources that generate the above-mentioned light onto the object to be inspected when an image is captured by an imaging means when light in the X-axis direction and the Y-axis direction is projected onto the object to be inspected and image processing is performed. A two-light source high-speed switching shutter device for image processing that switches at high speed includes a disk having a shutter window that is rotatable at a position that crosses the optical path from the two light sources to the object to be inspected; a detection means for detecting the rotational position of the shutter window in accordance with the detection; and a detection means for instructing the imaging means to take an image of the inspection object onto which light is projected in the X-axis direction or the Y-axis direction in response to the detection by the detection means. 1. A two-light source high-speed switching shutter device for image processing, comprising: signal generating means for generating a signal.