JPH07154804A - Sequential image pickup recorder - Google Patents

Abstract

PURPOSE:To make a control easy and to enable a miniaturization without requiring an independent and separate light source by rotating a color filter between an image pickup lens and a solid-state image pickup element and performing the rotation by using the driving power of a recording system. CONSTITUTION:The light transmission part of a rotation plate 202 is located at the optical path between a lens 201 and a solid-state image pickup element 205, and R, G, B light transmission parts are provided around the center axis at equal spaces. While the rotation plate 202 rotates once, each video signal of R, G and B is obtained and each signal is successively recorded in a rotation cylinder part 209. The output of the sensor to be provided on a motor 208 judges the relative location of the rotation cylinder 209 and the optical location of the rotation 202. The optical exchange/storage operation of the solid-state image pickup element 205 is synchronized with the rotation of the color filter. Therefore, the driving pulse from a driving circuit 301 is imparted so that the storage/reading of electric charge may be performed every time the R, G and B of the color filters are incoming.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an area-sequential image pickup recording apparatus for obtaining and recording color moving images in an area-sequential manner.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional frame sequential image pickup device. The light source bulb 101 emits light in a wide wavelength range. The light generated by the light source bulb 101 is condensed by the reflecting mirror 102, and the light is applied to the disc 103 having a color filter. Here, R (red), G (green) B on the disk 103
It is assumed that color filters of three colors (blue) are included. The light that has passed through the color filter of the disc 103 is sent to the optical fiber 105 through the lens 104. Since the disk 103 is rotated by the motor 106, the R, G, and B rays are sequentially sent through the optical fiber 105. From the tip of the optical fiber 105, each light beam is sequentially emitted toward the subject.

The image of the subject is illuminated by each of the R, G, and B illuminations, and the image illuminated by each light ray passes through the image pickup lens 107 and enters the solid-state image pickup element 108. The solid-state image sensor 108 only needs to detect the intensity of light, and normally it may be for black and white. For example, if the output of the solid-state image sensor 108 is obtained under R illumination, it becomes an R video signal. The output of the solid-state imaging device 108 is amplified by an in-noise reduction processing circuit 109 called correlated double sampling, and then amplified, and then input to an analog signal processing circuit 110. Further, the output of the analog signal processing circuit 110 is
It is digitized by the / D converter 111. The output of the A / D converter 111 is R, G, B by a switch 112.
It is distributed to the channel memories (113 to 115). Synchronized R, G, and B video signals are obtained from the output terminals 116 to 118 of the memories 113 to 115.

Correctly output R, G, and
The control unit 119 is required to obtain the B video signal. The control unit 119 firstly includes the motor 106.
The solid-state imaging device 10 is controlled by controlling the drive circuit 120 that drives the
The disk 103 is rotated in consideration of the read time of 8. Second, a power supply circuit 121 for turning on the light source bulb 101.
Is controlled so that the light source bulb 101 is turned off during the switching of the color filter of the disc 103 so that the mixed light rays of two colors are not sent. To obtain this function, a separate shutter may be attached in the optical path. Third, the timing pulse,
The solid-state image sensor 108 drive pulse generation circuit 122 is controlled to synchronize the rotation of the disk 103 and the drive of the solid-state image sensor 108. Fourthly, the switch 112 is controlled so that the disc 103
It is necessary to maintain the correspondence between the color filters included in the memory and the memories 113 to 115.

The above is the outline of the conventional frame-sequential imaging apparatus. A problem of the conventional frame-sequential imaging device is that independent R, G, and B light sources are required. Therefore, outdoor photography is impossible with the conventional method, and the number of subjects is limited. It has been applied to electronic endoscopes, but it is not used for ordinary video cameras.

Further, as described in the conventional example, there is a problem that the control system becomes very complicated. It is necessary to maintain the correlation between the drive system that rotates the color filter, the control of the light source bulb that serves as the illumination, and the drive timing of the solid-state image sensor. Since a separate light source is required, there is a problem that the device becomes large.

[0007]

The conventional frame-sequential image pickup device requires another light source having a narrow wavelength region, and cannot shoot outdoors. Furthermore, changing the color filter, controlling the illumination light source,
It is necessary to control the driving timing of the solid-state image sensor while maintaining the correlation, and a very complicated control system is required. Since it requires a light source, it is not suitable for miniaturization. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a field-sequential imaging recording apparatus that does not require an independent separate light source, is easy to control, and can be miniaturized.

[0008]

According to the present invention, a rotating color filter plate (or cylinder) is inserted in the optical path between an image pickup lens and a solid-state image pickup device, and the color filter plate (or cylinder) is used as a power source of a recording system. And a means for rotating the solid-state image sensor based on the detection signal of the optical position of the color filter by a sensor provided in the rotation system.

[0009]

Since the color filter exists in the optical path between the image pickup lens and the solid-state image pickup element, the illumination light of the subject may be normal light, and outdoor photography is also possible. The rotation of the color filter uses the power of the recording system, so that it can be miniaturized. By using the image sensor driving means such as an electronic shutter, the control of the light source becomes unnecessary.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. An optical image of a subject incident from the image pickup lens 201 passes through a filter of one color in the rotary plate 202 having a color filter and enters the image forming surface of the solid-state image pickup element 205. The video signal photoelectrically converted and output by the solid-state image sensor 205 passes through the noise reduction circuit and is amplified by the gain control amplifier 206. The amplified video signal becomes a recording signal in the signal processing circuit 207 and is sent to the magnetic head of the rotary cylinder 209 and is recorded on the recording medium.

The rotating cylinder 209 is rotated by a motor 208 for sequentially recording signals on a recording medium. Since the rotary plate is rotated by a part of the power of the motor 208, the pulley 2 is attached to the shaft between the motor 208 and the cylinder 209.
04 is provided, the rotary plate 20 via the rotary belt 203.
2 is rotated. The rotating plate 202 includes a light transmitting portion for the lens 2
01 and the solid-state image sensor 205. Therefore, as shown in FIG. 1 (B), the rotating plate 202 has R, G, and B light transmitting portions at equal intervals around the central axis thereof. Therefore, while the rotary plate 202 makes one rotation, R, G,
Each video signal of B is obtained and can be sequentially recorded by the rotary cylinder 209.

The motor 208 is provided with a sensor indicating the rotation phase thereof, and the sensor output is the rotation cylinder 2
Since the relative position of the color filter 09 and the optical position of the rotary plate 202 can also be determined, the gain control amplifier 20 is provided for each color filter.
An appropriate gain control signal is given to the signal generator 6. Instead of this gain control, the area of the color filter, that is, the shutter time may be changed to obtain an appropriate exposure time for each color signal.

The photoelectric conversion / accumulation operation of the solid-state image sensor 205 is synchronized with the color filter rotation. Therefore, the drive pulse is supplied from the drive circuit 301 so that the charge is stored and read out each time R, G, and B of the color filter arrives.

Operation of solid-state image sensor 205 and rotary plate 205
The center output of the motor 208 may be used as a timing signal of the drive circuit 301 in order to further stabilize the synchronous relationship between the rotation of the motor and the rotation of the rotary cylinder 209 of the recording system. The sensor that indicates the rotation phase of the motor 208 is an angle sensor.

The present invention is not limited to the above embodiment. A code signal representing a color type may be added to the video signal obtained for each color filter, and the code signal may be extracted at the time of reproduction to determine the color type and be used for color image reproduction.

In the above embodiment, the rotary plate 202 having the color filters is independently provided. However, if the recording medium itself is a rotating plate, such as an optical disk or a magnetic disk, a filter unit may be provided on this recording medium so that the color filter can be switched by rotating the recording medium.

FIG. 2A shows a disk 4 as a recording medium.
The structure of the imaging device when 01 is used is shown.
The same parts as those in FIG. 1A are denoted by the same reference numerals. The motor 208 rotationally drives the disk 401. here,
A part of the outer peripheral side of the disk 401 is arranged so as to be located in the optical path between the lens 201 and the solid-state image sensor 205. A plurality of color filters are sequentially provided in the portion located on this optical path. Reference numeral 402 denotes a recording head, and the head driving unit 403 controls the movement of the head 402 in the radial direction of the disk 401.

When a code signal representing a color type is added to the video signal obtained for each color filter, a timing signal from the motor 208 is used to generate a code signal in the signal processing circuit 207. The video signal of each color is inserted, for example, in the blanking period.
At the time of reproduction, the code signal can be extracted and used for identification for color signal reproduction.

FIG. 2B shows a circuit configuration example for obtaining the luminance signal Y and the color signal C in the signal processing circuit 207. This circuit is used, for example, when guiding a video signal to a monitor or a viewfinder. The sequential R, G, B video signals from the gain control amplifier 206 are
A / D converter 501 digitized, memory 502,
503 and the calculation unit 504. Memories 502, 5
Reference numeral 03 is for obtaining the time adjustment of the R and G signals read out previously. When the luminance signal Y is thus obtained, it is possible to detect the average level of the luminance signal Y and use it for automating the iris adjustment of the camera.

FIG. 3A shows an example in which a cylindrical filter 601 is arranged so as to surround the front and rear of the solid-state image sensor 205. FIG. 3B is a modification of the filter 202, and the areas of the R, G, and B light transmitting portions are adjusted to control the exposure time so that a desired gain can be obtained for each color. Here is an example.

[0021]

As described above, according to the present invention, there is no need for an independent separate light source as in the prior art, and the control is simple and downsizing is possible. Furthermore, it is possible to shoot and record high-resolution video signals of frame sequential without being restricted by the video signal system, and it is effective when converting to high-definition TV signals or normal TV signals according to the subsequent processing. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing another embodiment of the present invention.

FIG. 4 is a diagram showing a conventional frame-sequential imaging device.

[Explanation of symbols]

201 ... Imaging lens, 202 ... Rotating plate, 205 ... Solid-state imaging device, 206 ... Gain control amplifier, 207 ...
Signal processing circuit, 208 ... Motor, 209 ... Rotating cylinder, 301 ... Drive circuit, 401 ... Disk, 402 ... Head, 403 ... Head drive section.

Claims (9)

[Claims] 1. A rotary plate having a plurality of color filters is provided in the optical path between an optical lens system and a solid-state image pickup device, and the rotary plate is directly or indirectly used by using power of a motor or the like for driving a recording medium. A frame-sequential image pickup recording apparatus, which is configured to obtain an electric signal including color information by rotating and photoelectrically converting an optical image passing through each color filter using a solid-state image pickup element. 2. The frame sequential image recording apparatus according to claim 1, wherein the rotary plate having the color filter is a part of a disk as a recording medium. 3. The frame sequential imaging recording apparatus according to claim 1, wherein the rotary plate having the color filter has a cylindrical shape surrounding the front-back direction of the solid-state imaging device. 4. A drive circuit for setting charge accumulation and readout timings of the solid-state image pickup element is created based on a signal from a rotation detection sensor of a motor for driving the rotary plate, as an operation reference timing signal thereof. 2. The frame sequential imaging recording apparatus according to claim 1, wherein a period in which the color filter is located on the image pickup surface of the solid-state image pickup device and a period in which the solid-state image pickup device exposes an image are synchronized. 5. The frame sequential imaging recording apparatus according to claim 4, wherein the rotation detection sensor is an angle sensor of the motor. 6. The signal processing circuit for processing an output signal from the solid-state image pickup device has means for adding different code signals to video signals corresponding to the respective color filters. Frame-sequential imaging recording device. 7. The frame-sequential imaging recording apparatus according to claim 6, wherein said signal processing circuit comprises means for converting a video signal input in a frame-sequential manner into a luminance signal and a color signal. 8. A gain control amplifier for processing an output signal from the solid-state image pickup device gains a video signal corresponding to each color filter based on a signal from a rotation detection sensor of a motor for driving the rotary plate. 2. The frame sequential imaging recording apparatus according to claim 1, wherein the switching control is performed. 9. The frame sequential image recording apparatus according to claim 1, wherein the rotary plate has a plurality of color filters having different areas for adjusting an exposure time.