JPH06169467A - Method and device for sticking solid-state image pickup element - Google Patents

Abstract

PURPOSE:To accurately adjust registration by preventing the occurrence of shading in the horizontal direction at the time of monitoring and displaying an image pickup signal even in the case that the length of the cable line connecting each of CCD image sensors and each of color CCD driving circuits which drive them is long. CONSTITUTION:The electric charge stored in three CCD image sensors 6R, 6G, and 6B is read out by the system clock having a 1/4-fold normal speed from a timing generator 20 and is stored in a frame memory 19 as the image pickup signal. The image pickup signal stored in this frame memory 19 is read out by the read clock having a normal speed from the timing generator 20 and is displayed on a monitor device 22 and a measuring instrument 23 to adjust the registration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a solid-state image sensor (CCD).
The present invention relates to a solid-state image sensor fixing method and a solid-state image sensor fixing apparatus for fixing an image sensor) to a predetermined position of an image pickup optical system.

[0002]

2. Description of the Related Art Today, for example, a red (R) image forming signal for so-called high-definition can be formed.
There is known a solid-state imaging device provided with three CCD image sensors for red, green (G), and blue (B).

This solid-state image pickup device separates image pickup light into RGB image pickup light by a color separation prism of an image pickup optical system,
The image pickup signals of the respective colors are received and photoelectrically converted by the three CCD image sensors of R, G, and B, respectively, to form and output the image pickup signal.

Here, in order to make the subject image picked up by such a solid-state image pickup device accurate, the above-mentioned C
It is necessary to accurately adjust the registration (registration) of the color components imaged by the CD image sensor.

The adjustment of the registration is performed by the C for each color on the emission surface of the color separation prism of the image pickup light for each color.
The image pickup optical system is formed by temporarily fixing the CD image sensors. Next, each CCD image sensor is driven in the same manner as in normal use conditions, a so-called test chart is imaged, and registration is adjusted while observing the captured image of the test chart displayed on the monitor device.

In the above registration, the error is 1.
The thickness is preferably 0 μm or less, and when this condition is satisfied, the adjustment of the registration is completed. Then, each of the CCD image sensors is fixed to the color separation prism by screw fixing, adhesive fixing, solder fixing, or the like.

[0007]

However, when the registration is adjusted, the test chart imaged is displayed on the monitor device.
The length of the cable connecting each part for displaying the image pickup signal on the monitor device becomes long, and the image pickup signal from each CCD image sensor is horizontally aligned due to the distortion due to the reflection of the driving signal for driving each CCD image sensor. Directional shading was occurring. Therefore, it has been very difficult to make accurate registration adjustment.
Further, since the registration adjustment is performed in such a state, the fixing accuracy of each CCD image sensor is also hindered.

Recently, a CCD having a large number of pixels such as a so-called high-definition CCD image sensor is used.
Image sensors are in widespread use, and when the registration of the CCD image sensor is adjusted, the CCD
Since the driving speed of the image sensor (reading speed of accumulated charges) is faster than the driving speed of a normal CCD image sensor, the above-mentioned problem becomes more remarkable.

The present invention has been made in view of the above problems, and drives each of the CCD image sensors, which is caused by a long cable connecting each part for displaying an image pickup signal on a monitor device. It is an object of the present invention to provide a solid-state image sensor fixing method and a solid-state image sensor fixing apparatus capable of preventing distortion and the like due to reflection of a driving signal and accurately adjusting registration.

[0010]

According to a method of fixing a solid-state image pickup device according to the present invention, a registration of each solid-state image pickup device mounted on a respective exit surface of a color separation prism via a holder plate is imaged on a test chart. A method of fixing a solid-state image sensor, which is adjusted based on an image-capturing signal obtained by performing the following, wherein the charge accumulated in each of the solid-state image sensors is read out and stored at a slower speed than usual by imaging the test chart. Means for storing the image pickup signal stored in the storage unit, and adjusting the registration by reading the image pickup signal stored in the storage unit at a normal read speed.

Further, the solid-state image sensor fixing device according to the present invention registers the respective solid-state image sensors mounted on the respective emission surfaces of the color separation prism via the holder plate.
A fixing device for a solid-state image pickup device, which adjusts based on an image pickup signal obtained by picking up an image of a test chart, wherein the charge accumulated in each solid-state image pickup device is slower than usual by the image pickup of the test chart. The solid-state image sensor read control means for reading in, the memory means for temporarily storing the image signal read by the solid-state image sensor read control means, and the memory read for reading the image signal stored in the memory means at a normal read speed The above-mentioned problem is solved by having a control means.

[0012]

The solid-state imaging device fixing method according to the present invention is obtained by imaging the test chart of the registration of each solid-state imaging device mounted on each exit surface of the color separation prism via the holder plate. A method for fixing a solid-state image sensor, which is adjusted based on an image-capture signal, wherein the image captured by the test chart is read out at a slower rate than usual to read the electric charge accumulated in each of the solid-state image sensors, thereby monitoring the image-capture signal. Distortion due to reflection of the drive signal of each solid-state image pickup element, which is caused by a long cable connecting each part for displaying on the device or the like, is prevented. Then, by temporarily storing the image pickup signal, which is the electric charge read at a slower speed than the normal, in the storage means and reading the image pickup signal stored in the storage means at the normal read speed, the speed becomes slower than the normal speed. The transfer rate of the read image pickup signal is normalized, and the registration is adjusted based on the image pickup signal having the normalized transfer rate.

Further, in the solid-state image pickup device fixing device according to the present invention, the registration of each solid-state image pickup device attached to each emission surface of the color separation prism via a holder plate is performed.
A solid-state image sensor fixing device that adjusts based on an image pickup signal obtained by picking up an image of a test chart, wherein the solid-state image pick-up device read control means stores the charge accumulated in each of the solid-state image pick-up elements by the image pickup of the test chart. By controlling the solid-state image pickup device so as to read out the image at a slower speed than usual, the solid-state image pickup is generated by a long cable connecting each part for displaying the image pickup signal on a monitor device or the like. The distortion and the like due to the reflection of the drive signal of the element is prevented. Next, the storage unit temporarily stores the image pickup signal read by the solid-state image pickup device read control unit, and the storage read control unit reads the image pickup signal stored in the storage unit at a normal read speed. As a result, the transfer rate of the image pickup signal read by the solid-state image pickup device read control unit at a slower speed than usual is normalized. This image pickup signal is supplied to display means such as a monitor device.

[0014]

Embodiments of the solid-state image pickup device according to the present invention will be described below in detail with reference to the drawings. A solid-state image sensor fixing device according to an embodiment of the present invention is configured, for example, as shown in FIG. 1, and the solid-state image sensor fixing method according to the present invention is applied to the solid-state image sensor fixing device. .

That is, the fixing device for a solid-state image pickup device according to this embodiment in FIG. 1 includes a light source 1 and a chart box 2 having a built-in test chart which will be described after the irradiation light from the light source 1 is irradiated. , A master lens 3 that collects the imaging light formed by the irradiation light from the light source 1 passing through the chart box 2, and the imaging light for R (red), G (green), B ( It has a color separation prism 4 which is decomposed into imaging light for blue color and is emitted respectively, and a lens mount 5 which connects the master lens 3 and the color separation prism 4.

In the solid-state image pickup device fixing device according to the above-mentioned embodiment, the R CCD image sensor 6 is provided on each emission surface of the color separation prism 4 which emits the image pickup light for each color.
The CCD image sensor 6G for R and G, the CCD image sensor 6B for B, and the CCD image sensor 6R for each color 6R and 6 on the emission surface of the color separation prism 4 for the imaging light for each color.
G, 6B holding parts 7, 8, 9 for R and R for adjusting the position of each CCD image sensor 6R, 6G, 6B with respect to the emission surface of the color separation prism 4 for each color imaging light , G, B position adjustment jig 10,
It has 11 and 12.

The solid-state image pickup device fixing device according to the above-described embodiment will be described later, but the CCD image sensors 6R, 6G, and 6B for the respective colors are respectively set in accordance with, for example, a system clock that is 1/4 times the normal system clock. For driving R, G,
B CCD driving circuits 13, 14, 15 and C for each color
Amplifier 1 that amplifies the image signals for each color from the CD image sensors 6R, 6G, and 6B with a predetermined gain and outputs the amplified signals.
6, 17, 18 and a frame memory 19 which is a storage means for storing, for example, one frame of each color image pickup signal supplied via each of the amplifiers 16, 17, 18, respectively.

Further, in the solid-state image pickup device fixing device according to the above-mentioned embodiment, the system clocks which are 1/4 times the normal system clocks are supplied to the CCD driving circuits 13 to 15 for the respective colors, and also the frame memory 19 is supplied. A timing generator 20 for outputting a writing clock (WP) for the image pickup signal and a read clock (RP) for reading the written image pickup signal at a normal speed clock;
The image pickup signal read from the frame memory 19 is
For example, an image pickup signal processing circuit 21 for converting into an image pickup signal conforming to the NTSC system, a monitor device 22 for displaying an image according to the image pickup signal from the image pickup signal processing circuit 21, and an image pickup signal from the image pickup signal processing circuit 21. And a measuring device 23 for measuring the registration error of each CCD image sensor 6R, 6G, 6B based on the above.

The timing generator 20 constitutes a memory read control means, and the timing generator 20 and the CCD driving circuits 13 to 13 for the respective colors.
Reference numeral 15 constitutes a solid-state image sensor read control means.

Next, the operation of the fixing device for a solid-state image pickup device according to this embodiment having the above-mentioned structure will be described.

CCD image sensors 6R, 6 for the respective colors
When adjusting the registrations of G and 6B, the light source 1 is driven to be turned on. As a result, the irradiation light from the light source 1 is condensed by the master lens 3 via the chart box 2 and applied to the color separation prism 4.

The color separation prism 4 converts the irradiation light into R
And G and B are separated into respective image pickup lights, and the CCD image sensors 6R, 6G, and 6B for the respective colors are irradiated with the light.

Here, the chart box 2 has a repeating pitch τ _p having a predetermined relationship with the pixel pitch τ _{c of the} CCD image sensors 6R, 6G, 6B for each color as shown in FIG. 2A, for example. It has a built-in test chart consisting of repeating patterns. Therefore, the CCD image sensors 6R, 6G, 6B for the respective colors are irradiated with the image pickup light for the respective colors according to the test chart.

CCD image sensors 6R, 6 for the respective colors
G and 6B receive the imaging light for each color according to the above-mentioned test chart, and accumulate electric charges.

At this time, the timing generator 2
0 supplies the normal 1/4 speed system clock to the CCD driving circuits 13 to 15 for the respective colors.

The CCD driving circuits 13 to 15 for the respective colors are
The CCD image sensors 6R, 6G, and 6B for the respective colors are driven in accordance with the normal 1/4 speed system clock. As a result, the CCD image sensors 6R for the respective colors, according to the imaging light for the respective colors of the test chart,
The charges accumulated in each of 6G and 6B are read out as an image pickup signal at a transfer rate that is ¼ times the normal transfer rate. The image pickup signals for the respective colors are supplied to the amplifiers 16-1
7 is amplified and supplied to the frame memory 19.

Each of the CCD image sensors 6R, 6G,
It is difficult to shorten the length of the cable line connecting 6B and the CCD driving circuits 13 to 15 for the respective colors due to the structure of the fixing device for the solid-state image sensor. For this reason,
When the charge accumulated in each of the CCD image sensors 6R, 6G, and 6B is read at a system clock of a normal speed, distortion and the like due to the reflection of the system clock occur, resulting in horizontal shading when the image pickup signal is displayed on a monitor. Will appear. However, even if the length of the cable is long, by reading out the charges accumulated in the CCD image sensors 6R, 6G, and 6B with the system clock at the normal 1/4 speed, Distortion due to reflection does not occur. Therefore, it is possible to prevent the horizontal shading from occurring when the image pickup signal is displayed on the monitor.

The timing generator 20 supplies a write clock to the frame memory 19. As a result, the image pickup signals for each color read at the normal 1/4 speed are written in the frame memory 19.

As described above, the image pickup signals for each color written in the frame memory 19 are read by the read clock from the timing generator 20 so that the normal transfer rate is obtained. As a result, the image pickup signals for each color read at the transfer rate of 1/4 the normal speed are corrected and read so as to have the normal transfer rate. The read image signals for each color are supplied to the image signal processing circuit 21.

The image pickup signal processing circuit 21 performs processing such as sample-holding and adding a synchronizing signal to the image pickup signals for the respective colors, and outputs the image pickup signal conforming to the so-called NTSC system. The image pickup signal output from the image pickup signal processing circuit 21 is supplied to the monitor device 22 and the measuring device 23.

As a result, the captured image of the test chart is displayed on the monitor device 22 and the measuring device 23. As shown in FIG. 2B, a beat component due to the difference between the pixel pitch τ _c and the repeating pitch τ _p is generated in the image pickup signal. The registration adjuster recognizes a registration error from the zero cross point or level of the beat component displayed on the monitor device 22 and the measuring device 23, and the position detecting jigs 10 to 1 for the respective colors are recognized.
2, the CCD image sensors 6R, 6G,
Adjust 6B registration.

As described above, in the fixing device for a solid-state image pickup device according to this embodiment, the horizontal shading does not occur. Therefore, the registration can be adjusted accurately, and the CCD image sensors 6R and 6R can be adjusted.
It is possible to improve the fixing accuracy of G and 6B.

In the above description of the embodiments, the charges accumulated in the CCD image sensors 6R, 6G, 6B for the respective colors are read at a system clock that is 1/4 times the normal system clock. Of course, it may be arbitrary as long as it is slower than the normal speed, such as halving.

[0034]

The solid-state image pickup device fixing method and the solid-state image pickup device fixing device according to the present invention read out the electric charges accumulated in the solid-state image pickup device at a speed slower than usual. Even if the length of the cable connecting the driving means for driving the image pickup device is long, the distortion due to the reflection of the drive clock of the solid-state image pickup device does not occur.

Therefore, it is possible to prevent the horizontal shading of the display image caused by the distortion due to the reflection of the driving clock, to facilitate the registration adjustment, and to improve the fixing accuracy of the solid-state image pickup device. Can contribute to improvement.

[Brief description of drawings]

FIG. 1 is a block diagram of a fixing device for a solid-state image sensor according to an embodiment of the present invention, to which a method for fixing a solid-state image sensor according to an embodiment of the present invention is applied.

FIG. 2 is a schematic view of a test chart imaged by the solid-state image sensor fixing device according to the embodiment.

[Explanation of symbols]

1 ... Light source 2 ... Chart box 3 ... Master lens 4 ... Color Decomposition prism 5 ・ ・ ・ ・ ・ Lens mount 6R ・ ・ ・ ・ ・ ・ ・ ・ CCD image sensor for red (R) 6G ・ ・ ・ ・ ・ ・ CCD image for green (G) Sensor 6B ..... CCD image sensor for blue color (B) 7 to 9 ..... Holding parts 10 ..... ・ Position adjustment jig for red 11.・ ・ ・ ・ ・ ・ ・ ・ Green position adjusting jig 12 ・ ・ ・ ・ ・ ・ Blue position adjusting jig 13 ・ ・ ・ ・ ・ ・ R CCD driving circuit 14 ・ ・ ・・ ・ ・ G CCD drive circuit 15 ・ ・ ・ ・ ・ ・ B CCD drive circuit 16 to 18 ・ ・ ・ ・ Amplifier 19 ・ ・ ・ ・ ・ ・ ・ ・Memory 20 ・ ・ ・ ・ ・ ・ Timing generator 21 ・ ・ ・ ・ ・ ・ Imaging signal processing circuit 22 ・ ・ ・ ・ ・ ・ Monitor device 23 ・ ・ ・ ・ ・ ・ ・ ・ Measurement apparatus

Claims (2)

[Claims] 1. A solid-state imaging device for adjusting registration of each solid-state imaging device mounted on each exit surface of a color separation prism via a holder plate based on an imaging signal obtained by imaging a test chart. In the fixing method, the charge accumulated in each solid-state image pickup device is read at a slower speed than usual by the image pickup of the test chart and stored in the storage means, and the image pickup signal stored in the storage means is normally stored. A method for fixing a solid-state image sensor, comprising: reading at a reading speed of 1. to adjust the registration. 2. A solid-state image sensor for adjusting registration of each solid-state image sensor mounted on each exit surface of a color separation prism via a holder plate based on an image signal obtained by imaging a test chart. And a solid-state image sensor read-out control means for reading out the electric charge accumulated in each solid-state image sensor at a slower speed than usual by the image pickup of the test chart, and a solid-state image sensor read-out control means for reading the charge. A solid-state image sensor fixing device, comprising: storage means for temporarily storing the captured image pickup signal; and storage read-out control means for reading out the image pickup signal stored in the storage means at a normal readout speed.