JPS62264773A - Image pickup device - Google Patents

Abstract

PURPOSE:To easily and surely attain cleaning by controlling the shutting state of a shutter in synchronism with a shutter time and shutting a solid-state image pickup element just before the electronic shutter operation. CONSTITUTION:The electronic shutter operation is applied by using an image pickup section transfer pulse PI, a storage section transfer pulse PS and a horizontal transfer clock PH in synchronism with a synchronizing signal 7. The shutter 2 uses a drive control circuit 5 to repeat open/shut in synchronism with a vertical synchronizing signal VD at the same time. Since the image pickup section 31 of a solid-state image pickup element 3 is shut for a time t6-t1' sharing the most part of a time t5-t2' in the operation above, the shutter times t3-t4 and t8'-t4' are reduced, the electric sharge stored during the time t5-t2', that is, the cleaning current is small even when the aperture of a lens 1 is opened for the high speed shutter operation and the complete cleaning is attained by the cleaning of the times t2-t8'.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention uses electric charges according to optical images! An image capturing section that accumulates data during a certain shutter time; an accumulating section that accumulates one accumulated image for a certain period of time; and an image conversion unit for each scanning line based on the tfI that is accumulated in the accumulating section for a certain period of time. The present invention relates to an imaging device with an electronic shutter function, and a sweeping section that sweeps out the charges accumulated in the accumulation section.

[Conventional technology]

Conventional methods for performing a shutter operation in a solid-state imaging device include a method in which a mechanical optical shutter such as a rotary shutter is provided in front of the imaging device, and a method in which a solid-state imaging device that already has an electronic shutter function is used.

Figure 3 shows the configuration of an imaging device using the mechanical optical shutter described above. 4 is a solid-state image sensor, 4 is a video signal processing circuit that generates a video signal from the output of the 1st time element 30 and the output of the synchronization signal generation circuit 7, and 50 is a shutter time setting signal and the output of the synchronization signal generation port M7. 60 is a driving unit control circuit that drives and controls the optical shutter 20 based on the output of the synchronizing signal generating circuit 7; 60 is a drive pulse generation time that drives the image sensor 30 based on the output of the synchronizing signal generating circuit 7; 60 is a shutter image 7;
9 is a shutter image output terminal for outputting a shutter image signal of the field memory 8; 10 is a shutter command signal input terminal; and 11 is a shutter time setting input terminal.

Next, the operation will be explained.

Under the control of the drive control circuit 50, the mechanical optical shutter 20, such as a rotary shutter, receives a synchronization signal (: synchronously and periodically (1 in the case of NTSC) output from the synchronization signal generator 7).
/60 or L'305ec)t: v Perform a yaw motion. When a shutter command signal is applied from the outside to the shutter command input terminal 10, the output signal of the video signal processing circuit 4 is written to the field memory 8, and the output of the field memory 8 is used as a shutter image signal to the shutter image output terminal 91: Output. The shutter time is determined by the control operation of the drive control circuit 50 based on the signal from the shutter time setting input terminal 11. In other words, the drive control circuit 50 also changes the aperture and slit width of the rotary shutter.

Note that if the shutter time is constant, such an operation is unnecessary.

Fig. 4 is a configuration diagram of an imaging device using a solid-state image sensor having a single-child shutter function. This is a drive pulse generation circuit for operating the shutter.

Here, this solid-state image sensor 3 is as shown in FIG. In FIG. 5, reference numeral 31 denotes an imaging section that accumulates charges corresponding to an optical image in a certain amount of time, and 32 indicates charges accumulated in this imaging section 31. A horizontal output register 34 sequentially sends charges to the signal output terminal 37 of the solid-state imaging probe based on the charges accumulated in the old storage section for a fixed period of time. This is a cleaning drain that serves as a sweeping section that removes the charges that have passed through.

Next, the operation of the above-mentioned four components will be explained in the timing chart shown in FIG. 6.

As shown in the timing chart of FIG. 6, the image is captured in the image capture unit transfer register 35 that transfers the charge of the image capture unit 31 of the solid-state image sensor 3 to the storage unit 32 in synchronization with the vertical synchronization pulse VD from the synchronization signal generator 7. The part transfer pulse PI is transferred to the storage part 3.
A storage section transfer pulse PS is applied to the # horizontal section transfer register 36 that transfers the charges of #2 to the horizontal output register 33 or the cleaning drain 34, respectively. Furthermore, when the horizontal transfer pulse PH is applied to the horizontal output register 33, the time t
The image capturing section transfer pulse PI and storage section transfer pulse PS (the number of pulses is equal to the number of vertical pixels of the field) from 2 to t8 allow high-speed imaging i#! The charge in the portion 31 is transferred to the storage portion 32, and the charge in the cover portion 32 is discarded via the cleaning drain 34. During the next time t8 to t4, charges corresponding to the optical image are newly accumulated in the imaging unit 31, and the time t8
The charges accumulated in the imaging unit 31 from ~t4 are the shutter image, and the time from ta to t4 is the shutter time. Next, the charges accumulated in the imaging section 31 between times t8 and t4 are transferred to the storage section 31 at high speed by the imaging section transfer pulse PI and the storage section transfer pulse PS (the number of pulses is equal to the number of vertical pixels of the field) between times t4 and t5. will be forwarded to. The charges in the storage section 32 that were on sale are discarded to the cleaning drain 34. The four-shot shutter image is stored in the storage unit 32 until time t7, and time 1? From the storage unit transfer pulse Pa(
1 pulse per horizontal scanning line) and horizontal transfer pulse PH (
(number of horizontal pixels per horizontal scanning line), the horizontal output register 3 is output in units of horizontal scanning lines according to the standard TV system until time t8.
3, and is output to the element signal output terminal 37.

By repeating such operations, as shown in vs in Figure 6, the signal from time t8 to t4 is placed at position @A (time t7 to ts), and the signal 1g from time ta' to t4' is placed at position (time t7). '
~t8'), a standard TV constant scanning field signal is outputted to the element signal output terminal 37. Now, the 61st shutter command signal SP is input to the shutter command input terminal 10. When input at timings such as ¥, l, a synchronizing signal is input to the field memory 8 by the bidet 100 processing circuit 4, and the shutter 1 [tLIti<signal SG signal mVB1 is input into the shutter image. Until the arrow gloss command signal SP arrives, the output terminal 9 outputs the ``Nyatta Gazuka Bl''. Start shutter time t8~.

ts' to t4' can be freely set by changing the times t2 to t8 or t4 to t5 of the imaging section transfer pulse PI and #seed section transfer pulse PS from the shutter time setting input terminal 11 of the drive pulse generation circuit 6. -I can. The cleaning operation for electronic shutter operation is from time t2 to tn, from ts' to
Imaging section transfer pulse PI and #seed section transfer pulse P at t8'
The charge stored in the storage section 31i at this time is the charge accumulated during the time period t5 to t2'. When the shutter times ta-, t+, ta' to t4' become shorter, that is, the faster the shutter speed is used, the lens 1 needs to be opened closer to its open position and must be removed by a cleaning operation. The charge becomes very large, and from time t8 to t4. During the cleaning from t8' to t41, the charge on the imaging section 31 may not be completely removed. The remaining charge becomes the shutter image signals A and B, and is superimposed on the upper part of the screen, deteriorating the image quality of the shutter image (blooming occurs). That is, the cleaning operation becomes difficult when using a high-speed shutter.

[Problem that the invention seeks to solve]

In conventional imaging devices, when shutter operation is performed using a mechanical optical shutter such as a rotary shutter, high-speed shutter operation is difficult, and the mechanical operation reduces reliability and service life. However, there was a problem. Further, in the case of an image pickup device that performs an electronic shutter operation using a solid-state image sensor with an electronic shutter function, there is a problem that cleaning operation during high-speed shutter operation is difficult and the quality of the shutter image deteriorates.

This invention was made in order to eliminate the above-mentioned problems, and uses a solid-state image sensor with an electronic shooting function to perform a ``Nariko shutter'' operation, thereby making it possible to perform a high-speed shutter operation as well as a low-speed shutter operation. It is an object of the present invention to provide an imaging device that can easily and reliably perform the leaning operation required for the secondary shutter operation in combination with a mechanical shutter such as a rotary shutter.

[Means for solving problems]

For this reason, the imaging device according to the present invention includes a front surface of the imaging section 31 of the imaging element 3 with a shutter function (a shutter device 2 that is split into two and blocks light input to the imaging section 31, and a This device is characterized in that a drive control circuit 5 for controlling shutoff of the shutter device 2 in synchronization with time is glazed.

[Effect]

The shutter device 2 according to the present invention blocks light input to the imaging section 31 in synchronization with the shutter time of the imaging device 3.

This synchronization is controlled by the drive control circuit 5.

Therefore, since the shutter device 2 shuts off the source until just before the electronic shutter is operated, there is less charge on the imaging section during cleaning, and cleaning can be performed reliably with a single cleaning operation, and no blooming occurs and high quality is achieved. One shutter image is obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an imaging device according to the present invention. In the figure, 1 is a lens, 2 is a mechanical optical shutter such as a rotary shutter, etc., 3 is a solid-state image sensor with an electronic shutter function, and 4 is a solid-state image sensor. A video signal processing circuit that generates a video signal from the output signal of the image sensor 3 and the output of the synchronization signal generator 7, 5 a drive control circuit for operating the shutter device 2 in synchronization with the synchronization signal, and 6 a solid-state image sensor. 3, a drive pulse generation circuit for operating the shutter command input terminal 10; 8, a field memory for storing the field signal of the video signal processing circuit 4, that is, the negative image number 1 in response to the shutter command signal from the shutter command input terminal 10; and 9, a field memory for storing the shutter image. Output terminal, 1
Reference numeral 1 denotes a Nyatta time setting input terminal. Note that the same constituent ammonium elements as in the prior art are given the same numbers.

Here's a photo with the electronic shutter! The structure of element 3 is the same as that shown in FIG.

Next, the present invention will be explained in detail based on the timing chart shown in FIG.

In synchronization with the synchronous signal of the synchronous No. 15 generator 7, the conventional No. 5
The figure shows the boss FJ8 device as well as the 1 Iebe transfer pulse PI
, the flea is excited by the storage section transfer pulse PS and the horizontal transfer lock PII. At the same time, the shutter device 2 is repeatedly opened and light-blocked in synchronization with the synchronization signal VD by the circuit 5 at the timing shown in FIG. In such an operation, the m+ quadrant 31 of the solid-state image sensor 3 is shielded from light during the time t6-tl', which occupies most of the time t5-t, and the shutter time t3-t*, t.
a' to t, to shorten I and perform high-speed shutter operation (
Even if the aperture of the second lens 1 is opened, the charge accumulated during the time t5 to t21, that is, the charge to be cleaned, becomes small, and the cleaning operation from TILTS to ts and ts to t a' is complete, and the cleaning is completed at sH. Become.

The opening time t1-t6 of the shutter device 2 is longer than the shutter time t8-t4. The shutter speed becomes faster. Also, the timing of the release of light is tx (t2.t
a) High timing accuracy is not required as long as ts is satisfied.

In the above embodiment, a mechanical optical shutter such as a rotary shutter was used as the shutter device to block light until just before the electronic shutter operated, but a liquid crystal shutter or P
A similar effect can be obtained by using an optical shutter using an electric field such as LZT.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a shutter device which is provided at the front surface 1 of an imaging section of an image sensor with an electronic shutter function and which sources input to the imaging section at a location, and Since it is equipped with a control circuit that synchronously controls the shutoff of the shutter device, the solid-state image sensor can be shielded from light until just before the electronic shutter is operated, making it possible to easily and reliably perform the cleaning operation two times in a row. This has the effect of providing a shutter image of the Bihonkan.

[Brief explanation of drawings]

Fig. 11 is a block diagram showing a solid-state imaging device according to an embodiment of the present invention, Fig. 2 is a timing chart showing the operation of the present invention, and Fig. 3 is a block diagram of a conventional imaging device using a mechanical shutter. , FIG. 4 is a block diagram of an imaging device using a conventional image sensor with an electronic shutter function, FIG. 5 is a block diagram of an imaging device with an electronic shutter function, and FIG. FIG. 3 is a timing chart diagram showing the operation of the imaging device. In the figure, 1 is a lens, 2 is a shutter device, 3 is a solid-state image sensor, 4 is a video signal processing circuit, and 5 is a drive unit.
tlj control circuit, 6 is a drive pulse generation circuit, 7 is a synchronization signal generation circuit, 8 is a field memory, 9 is a shutter image output terminal, 10 is a shutter command input terminal, and 11 is a shutter time setting input terminal.

Claims (1)

[Scope of Claims] Charges corresponding to the optical image accumulated in the imaging section within a certain shutter time are accumulated in the accumulation section, and the accumulated charges are converted into video signals in units of scanning lines and outputted, and then the above-mentioned In an imaging device equipped with an imaging element that sweeps out charges accumulated in an accumulation section, a shutter device provided in front of the imaging section and blocking light input to the imaging section; An imaging device comprising: a drive control circuit that controls shutoff of the shutter device.