JPH02166976A - Driving device for image pickup element - Google Patents

Abstract

PURPOSE:To eliminate difference between picture quality and a still mode by outputting a forcible accumulation control signal and a sweeping-out signal after the output of a reading signal is finished when picture recording is executed by a movie mode. CONSTITUTION:Even when the picture recording is executed by the movie mode, an MPU 15 outputs the forcible accumulation control signal and sweep-out requesting signal after periodical reading is finished and before a periodical accumulation control signal is outputted from a clock generator 14 when exposure is started. Then, the sweeping-out signal is outputted from the clock generator 14 and the charge of a light receiving part and a veritcal transferring part in a CCD 11 is clearly swept out. further, after sweeping-out operation is finished, a time until the exposure is started is shortened and the accumulation quantity of the unnecessary charge, which causes a noise, is reduced. Thus, the difference of the picture quality between a recorded picture by the movie mode and a recorded picture by the still mode is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD J The present invention relates to a driving device for an image carrying element in an electronic still camera that can record one image at a time in movie mode or still mode.

"Prior Art and its Problems" In recent years, various electronic still cameras have been developed that use CCD imaging elements and magnetic disks instead of conventional silver halide films.

The CCD image sensor can provide the same shutter speed control function as a conventional mechanical shutter by changing the time interval at which the signal charges accumulated in the light receiving section are transferred to the vertical transfer section (CCD for vertical transfer), that is, the accumulation time. It will be done. Recently, attempts have been made to reduce the weight of cameras by adopting purely electronic shutters that utilize this control of charge accumulation time.

In addition, in order to reduce costs, conventional electronic still cameras use CCDs that are equivalent to those used in video cameras.
An imaging unit (an interline transfer type CCD imaging device and its driving device) is used.

In this CCD imaging unit for a video camera, during normal operation (movie mode), signal charges accumulated in the light receiving section are periodically (approximately every 1/60 seconds) simultaneously transferred to the vertical transfer CCD. , the signal charges are sequentially read out before the next periodic transfer of signal charges takes place. Transfer to the vertical transfer CCD is performed by a periodic accumulation control signal output from the pulse signal output means, and reading is performed by a read signal consisting of vertical and horizontal transfer signals output from the pulse signal output means. That is, in the movie mode, all operations are controlled by signals periodically output from the pulse signal output means.

On the other hand, when the electronic shutter is operating (in still mode), the light is received by the first forced accumulation control signal output from the control means before the first periodic accumulation control signal is output after outputting the readout signal. The unnecessary charges accumulated in the vertical transfer CCD are transferred to the vertical transfer CCD, and are swept out by a sweep signal output from the pulse signal output means.

Then, the readout signal outputted from the pulse signal output means is stopped, and the unnecessary charge accumulated in the light receiving section is transferred to the vertical transfer CCD by the second forced accumulation control signal outputted from the control means at a predetermined timing. , exposure is started. The unnecessary charge transferred to the vertical transfer CCD by the second forced accumulation control signal is swept away in a short time by a sweep signal output from the pulse signal output means before the exposure time ends.

At the end of exposure, a periodic accumulation control signal is output from the pulse signal output means, and the charges accumulated in the light receiving section during the exposure time are transferred to the vertical transfer COD.

This signal charge is then read out by a regular readout signal output from the pulse signal output means.

Next, the operation of the image sensor will be described with reference to timing charts shown in FIGS. 4 and 9. FIG. 4 is a timing chart regarding the still mode, and FIG. 9 is a timing chart regarding the movie mode. In this example, the periodic accumulation control signal C
TG and read signals are output periodically at predetermined time intervals (approximately 1760 seconds). Periodic accumulation control signal CTG
The period during which is output is defined as one field.

In the still mode, after outputting the read signal and before outputting the periodic accumulation control signal CTG, the first forced accumulation control signal PTG is output.
, and a sweep signal are output, and unnecessary charges accumulated in the light receiving section are transferred to the vertical transfer CCD and swept out. That is, unnecessary charges are swept out in field n immediately before field n+1, which includes the exposure time for accumulating signal charges for recording.

Thereafter, at a predetermined timing, a second forced accumulation/control signal P T G * is output, unnecessary charges accumulated in the light receiving section are transferred to the vertical transfer COD, and exposure is started.

At the end of exposure, a periodic accumulation control signal CTG is output, and the signal charges accumulated during the exposure time (shutter speed) TV are transferred to the vertical transfer CCD, and the exposure ends.

The unnecessary charge transferred to the vertical transfer CCD by the second forced accumulation control signal PTG2 is transferred to the periodic accumulation control signal CT.
Immediately before G is output, it is swept out in a short time by a sweep signal.

Then, the signal charge accumulated in the light receiving section during the exposure time TV and transferred to the vertical transfer COD by the periodic accumulation control signal CTG is read out by the periodic readout signal and recorded as a video signal (◎ in Fig. 4). ).

On the other hand, when recording in movie mode, as shown in FIG. The unnecessary charges are transferred to the vertical transfer COD, and exposure is started.

The unnecessary charge transferred to the vertical transfer COD by the periodic accumulation control signal CT G r is read out by the read signal and discarded before the periodic accumulation control signal CTG at the end of exposure is output.

Then, when the periodic accumulation control signal CTG is output at the end of exposure, the exposure field n+1, that is, the exposure time T
The signal charges accumulated during V + 1/60 seconds are transferred to the vertical transfer CCD, and the exposure is completed. The signal charge transferred to the vertical transfer CCD is read out by a regular readout signal and recorded as a video signal (
).

As described above, in the movie mode, only the periodic readout signal is output between the periodic accumulation control signal CTG at the start of exposure and the periodic accumulation signal CTG output immediately before.

On the other hand, in the still mode, the second forced accumulation control signal P T G z at the start of exposure is included.
In field n immediately before +1, after the periodic read signal is output, the first forced accumulation control signal PTG and the sweep signal are output.

In this way, in conventional CCD imaging units, unnecessary charges accumulated in the field immediately before exposure are processed differently in movie mode and still mode, so even if the exposure time is the same, images recorded in movie mode and still images are different. The image quality of images recorded in still mode was different.

When recording is enabled in both still mode and movie mode, an imbalance occurs in the recorded image due to the above-mentioned reason, even though the exposure values are the same.

``Object of the Invention'' The present invention has been made in view of these conventional problems, and it is possible to control the charge accumulation time of the imaging means, and also to maintain the same image quality in movie mode recording and still mode recording. An object of the present invention is to provide a driving device for an image sensor that facilitates adjustment to achieve the following.

"Summary of the Invention" The present invention, which achieves the above object, includes a light receiving section that converts incident light from a subject into signal charges and accumulates them, and a vertical transfer section that temporarily holds the signal charges accumulated in this light receiving section. an imaging means comprising; during normal times, the imaging means periodically outputs an accumulation control signal for causing the signal charge accumulated in the light receiving section to be transferred to the vertical transfer section; and outputs the periodic accumulation control signal. Later, a readout signal is outputted to sequentially read out the signal charges transferred to the vertical transfer section, and when a sweep request signal is input from the outside, a sweepout signal is outputted to quickly sweep out the charges in the vertical transfer section. , a pulse signal output means for outputting a pulse signal at a predetermined time for a predetermined time; outputting at an arbitrary timing a forced accumulation control signal for transferring the electric charge of the light receiving section of the imaging means to the vertical transfer section, together with the forcible accumulation control signal; or and a control means that independently outputs the sweep-out request signal; the control means is characterized in that during normal recording, the control means outputs a sweep-out request signal for sweeping out unnecessary charges.

According to the present invention, even when recording in movie mode, the forced accumulation control signal and the sweep signal are output after the periodic readout ends and before the periodic accumulation control signal at the start of exposure is output. The charges in the light receiving section and the vertical transfer section are cleanly swept out. Moreover, the time from the end of the sweep operation to the start of exposure is short. Therefore, the amount of accumulated unnecessary charge that causes noise is small, and there is no difference in image quality between images recorded in movie mode and images recorded in still mode.

"Embodiments of the Invention" Below, embodiments of the non-life insurance element driving device according to the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing a schematic configuration of an image sensor driving device.

As shown in the figure, a CCD image sensor 11 as an imaging means
, a driver 12 that drives this CCD image sensor 11.
is connected. The driver 12 has a COD as a pulse signal output means via an electronic shutter control circuit 13.
A drive clock generator 14 and a microprocessing unit (MPU 15) as a control means are connected. The MPU 15, the electronic shutter control circuit 13, and the driver 12 constitute a control means.

The CCD image sensor 11 uses an incline transfer method, and a subject image that enters from the photographing lens 16 and passes through the aperture 17 is formed on each photodiode constituting the light receiving section, and the subject image is converted into a signal charge. captured in the form of The aperture 17 is driven by an aperture adjustment circuit, and the aperture adjustment circuit 18 is driven by an aperture adjustment circuit.

The drive is controlled by the MPU 15.

The signal charge accumulated in the photodiode of the CCD image sensor 11 is simultaneously transferred to the vertical transfer CCD as a vertical transfer section.
will be forwarded to. The charge transferred to the vertical transfer CCD is
At the time of reading, the data is sequentially transferred to the horizontal transfer CCD, and is read out from the horizontal transfer CCD for each horizontal line, and at the time of sweeping, it is swept out to the sweep drain provided on the opposite side of the horizontal transfer CCD.

A recording/reproducing section 19 is connected to the readout gate of the CCD image sensor 11 . This recording/reproducing unit 19 includes a CCD image sensor 1
The information regarding the signal charge outputted from the magnetic disk 20 is recorded as a video signal on the magnetic disk 20, or
The video signal recorded in 0 is read out and played back. The operation of the magnetic disk 20 and the recording/reproducing section 19 is controlled by the MPU 15.
controlled by

The MPU 15 includes a photometric element 2 that measures the brightness of the subject.
A photometry section 22 is connected which logarithmically compresses the photometry signal from 1, performs A/D conversion, and outputs it as digital photometry data. The MPU 15 calculates an optimal aperture value and shutter speed TV (charge accumulation time) based on the photometric data.

Furthermore, a release button 23 for starting imaging is connected to the MPU 15. When an on signal is output from the release button 23, the MPU 15 performs photometric calculations based on the photometric data outputted from the photometric section 22, narrows down the aperture 17 via the aperture adjustment circuit 18, and controls the CCD image sensor 11. and controls recording.

Next, the configuration and operation related to the signals that drive the CCD image sensor 11 will be explained.

The clock generator 14 periodically outputs an accumulation control pulse as a periodic accumulation signal, a relatively low-speed transfer pulse, and a readout pulse as a readout signal for reading out the signal charges transferred to the vertical transfer CCD. .

The periodic accumulation control pulse and the low-speed transfer pulse are output at constant intervals (1/60 second intervals), and the charges accumulated in the light receiving section of the CCD image sensor 11 are transferred all at once to the vertical transfer CCD.

The read pulse is output periodically while the regular accumulation control pulse is output, and reads out the charge transferred to the vertical transfer CCD. The readout pulses include a vertical transfer pulse that sequentially moves the signal charge transferred to the vertical transfer CCD to the horizontal transfer CCD, and a horizontal transfer pulse that reads the signal charge of the horizontal line transferred to the horizontal transfer COD. However, in this embodiment, for the sake of simplicity, the horizontal transfer pulse will not be explained.

Furthermore, from the clock generator 14, a vertical transfer C
A high-speed transfer pulse is output as a sweep signal that sweeps out the charge on the CD in a short time. This high-speed transfer pulse is M
On the condition that the sweep request pulse is inputted from the PU 15, it is output for a predetermined time after the output of the read pulse is finished, and the output ends before the output of the next periodic accumulation control pulse.

The periodic accumulation control pulse is output to the electronic shutter control circuit 13 via CTG, and both transfer pulses and read pulses are output to the electronic shutter control circuit 13 via CV1 to CV4.

The pulses output to cv and -cv4 are either an accumulation control signal or a vertical transfer signal (read signal or high-speed sweep signal) depending on the level of the CTG accumulation control pulse.

The MPU 15 comprehensively controls the operation of the entire drive device, and switching pulses are output from here via the PS. Whether this switching pulse PS is “H” or “L”
”, it is determined whether the output of the electronic shutter control circuit 13, that is, the pulse from the MPU 15 or the pulse from the tarlock generator 14 is output to the driver 12.

The MPU 15 outputs forced accumulation control pulses and transfer pulses as forced accumulation control signals that cause the signal charges accumulated in the light receiving section of the CCD image sensor 11 to be transferred all at once to the vertical transfer CCD.

The forced accumulation control pulse is passed through PTG, and the transfer pulse is passed through PTG.
The signals are output to the electronic shutter control circuit 13 via v1 to P4, respectively.

Further, the MPU 15 outputs a sweep request pulse as a sweep request signal to the clock generator 14 via the PHV. When this sweep request pulse PHV is output, the clock generator 14 sends a high-speed transfer pulse as a high-speed sweep signal that sweeps out unnecessary charges at high speed as described above to the electronic shutter control circuit 13 via Cv1 to CV4. Output.

The CTG or PTG accumulation control pulse output from the MPU 15 or the clock generator 14 is alternatively output from the electronic shutter control circuit 13 to the driver 12 via the TG. Further, from the electronic shutter control circuit 13 to the driver 12, Cvl~ outputted from the MPU 15 or the clock generator 14
The transfer pulse of Cv4 or PV, ~PV4 is alternatively
It is outputted via ■, to ■4.

Transfer pulses as accumulation control signals, readout signals, or high-speed sweep signals are transmitted from the driver 12 to the CCD image sensor 11 from Φ■ to Φv4.
Output via .

As mentioned above, the clock generator 14 or MP
Which accumulation control pulse output from U15 is used and which transfer pulse is used is determined by the switching pulse output from MPU 15 via PS.

Transfer pulses Φv1 to Φ■ output from the driver 12,
corresponds to the level of the accumulation control pulse TG, and becomes an accumulation control signal for transferring the charge of the photodiode to the vertical transfer COD, a readout signal for vertically transferring the charge on the vertical transfer CCD, or a high-speed sweep signal. That is, when the accumulation control pulse TG is at the "L" level, it becomes an accumulation control signal, and when it is not, it becomes a read signal or a sweep signal.

FIG. 6 shows an example of a specific circuit of the inverting type driver 12.

As shown in the figure, the TG accumulation control pulse and cv,
A plurality of sets of pulse signals are output by combining the -cv4 transfer pulses.

When the TG accumulation control pulse level is "L", the changeover switch element 30 is connected to vH as shown in the figure, and when the same pulse level is "H", it is switched to the connection with VM. .

The changeover switch element 31 is connected to the switch 30 as shown in the figure when the transfer pulse level of vl is "L", and is switched to the connection with vL when the same level is "H".

When the transfer pulse level of v2 is "L", the changeover switch element 32 is connected to v2' as shown in the figure, and when the same level is "H", it is switched to Vt.

f, to, above V, 1. The relationship between the levels of VM (vM') and vL is VH>VM (VM")>VL.

The circuits related to (2) and V4 are configured the same as the circuits (2) and V2 above, respectively.

The specific timing chart of the driver 12 is shown in the seventh section.
It is shown in the figure. When there is no input of the TG accumulation control pulse, the changeover switch element 30 is switched to V, so the V transfer pulse is inverted and output from Φvl.

From ΦV, QΦVs, and Φv4, ■yo and Vs, respectively.
, V4 are inverted and output similarly to V1 above.

In the above case, the "H" level of ■, ~v4 is equal to the "L" level of Vv, V-" of Φv1 ~ Φ■4.
"Level corresponds to VL level.

Furthermore, when the TG accumulation control pulse is input, the changeover switch element 30 switches to V, 4 as shown in the figure.
When the level of V, ,V, is L'', Φ■0, ΦV
, the level becomes VH.

As explained above, Φ■1 and ΦV are three-value signals, and when Φvl+Φv3 is the highest level (■), it becomes an accumulation control signal, and the charge accumulated in the photodiode is transferred to the vertical transfer CCD. On the other hand, Φv1
When the level of ~Φ■4 takes V-, Vy', and ■, it becomes a vertical transfer pulse, and the charges transferred to the vertical transfer CCD are sequentially transferred on the vertical transfer CCD.

Next, a specific recording operation in the movie mode of the image carrier control device of the present invention configured as described above will be explained based on the flowchart shown in FIG. Note that this flowchart will be explained with reference to the schematic configuration diagram in FIG. 1 and the timing chart in FIG. 2.

First, when the release button 23 is turned on, the MPU 15
checks whether the pulse VD has risen from "L" to "H" (steps 51 to 53). Note that the pulse VD is a pulse outputted from the clock generator 14 for a predetermined period of time immediately before outputting the periodic accumulation control pulse.

When pulse VD rises, switch pulse PS is set to L”
and set the sweep request pulse PHV to "H" (step 54).

With this setting, the electronic shutter control circuit 13 becomes in a state where the driver 12 can receive pulses from the MPU 15.

The MPU 15 outputs a forced accumulation control pulse PTG and transfer pulses PV, ~Pv4 (step 55). As a result, as shown in FIG. 2, the periodic accumulation control pulse CT
G. After output, unnecessary charges accumulated in the light receiving section are transferred to the vertical transfer CCD.

After outputting the forced accumulation control pulse PTG, the MPU 15 sets the switching pulse PS to "H" (step 5).
6). With this set, pulses from the clock generator 14 are outputted from the electronic shutter control circuit 13 to the driver 12. In other words, clock generator 1
The high-speed transfer pulse output from 4 is transmitted to the CCD image sensor 11.
Unnecessary charges input into the vertical transfer CCD and transferred to the vertical transfer CCD are swept out.

After setting the switching pulse PS to "H", the MPU 15 waits for the output of the high-speed transfer pulse to finish, and when the output of the high-speed transfer pulse is finished, checks the rising and falling edges of the pulse VD (step 57-5
9), that is, it waits for the end of exposure.

During exposure, the following operations are performed.

Periodic accumulation control signal C that starts exposure from the clock generator 14 after the output of the high-speed transfer pulse is finished.
TG is output, and unnecessary charges in the light receiving section are transferred to CO for vertical transfer.
The signal charge is transferred to D, and the light receiving section starts accumulating signal charges.

While the light receiving section is accumulating signal charges, a read pulse is output from the clock generator 14, and the unnecessary charges transferred to the vertical transfer COD are read out by the periodic accumulation control pulse CTGI.

Furthermore, after the output of the read pulse is finished, a high-speed transfer pulse is output from the clock generator 14, and unnecessary charges remaining in the vertical transfer COD are completely swept out.

The above operations are executed while the MPU 15 is checking the VD pulse. The MPU 15 checks the falling pulse VD after the above operation and opens the REC gate (step 60).

This makes it possible to record the signal charge read out from the C″CD image sensor 11.

After the pulse VD falls, the clock generator 14
Meanwhile, a periodic accumulation control pulse CT G x and a transfer pulse are output, and the signal charge accumulated in exposure field n+1 (exposure time TV) is transferred to the vertical transfer COD.

These signal charges are transferred to one clock generator 14.
The signal is read out by the read pulse output from the recording/reproducing unit 19 and recorded on the magnetic disk 20 as a video signal (
recorded).

When recording is finished, the MPU 15 closes the REC gate,
Return the sweep request pulse PHV to “L” and then END
The process proceeds to a standby state in which it waits for the release button 23 to be pressed (steps 61 to 63).

The above explains the recording operation in movie mode.
Next, the recording operation in the still mode will be explained with reference to the flowchart of FIG. 5 and the timing chart of FIG. 4.

First, when the release button 23 is turned on, the MPU 15
sets the switching pulse PS to "H" and the sweep request pulse PHV to "L" (step 71.
72) 1 With this set, the pulses output from the clock generator 14 are output to the driver 12, so the driver 12 outputs the periodic accumulation control pulse CTG and the transfer pulse CV1 at a cycle of 1/60 seconds.
~Cv4 is output.

The MPU 15 executes a photometric calculation based on the photometric data regarding the brightness of the subject outputted from the photometric section 22, determines the optimal aperture value AV and shutter speed TV (step 73), and calculates the optimal aperture value AV and shutter speed TV. AV, controls the aperture adjustment circuit 18 and adjusts the aperture 1 to the optimum aperture value.
7 (steps 74 and 75).

When the setting of the aperture 17 is completed, the MPU 15 waits for the pulse VD to become "H", and then changes the switching pulse PS to "L".
, set the sweep request pulse PHV to “H” (
Steps 76.77).

With this set, the pulse of the MPU 15 is output to the CCD image sensor 11, and the MPU 15 outputs the forced accumulation control pulse PTG and the transfer pulse (step 78). is transferred to the vertical transfer CCD.

After that, the MPU 15 sets the switching pulse PS to "H" (step 79). As a result, the high-speed transfer pulse from the clock generator 14 is transferred to the CCD image sensor 1.
1 and the unnecessary charges transferred to the vertical transfer CCD are swept out.

The MPU 15 waits for the switching pulse PS to be set to "H" and for the output of the high-speed transfer pulse to end.

When the output of the high-speed transfer pulse is finished, the MPU 15 sets the switching pulse PS to "L" (step 81).
With this set, the pulses of the MPU 15 are input to the CCD image sensor 11, and even if the periodic accumulation control pulse and read pulse are output from the clock generator 14, they are not input to the CCD jR image element 11.

Then, when the optimum shutter speed TV calculated in step 73 is obtained, the MPU 15 generates a forced horizontal storage control pulse P.
TG and output a transfer pulse (step 82);
As a result, unnecessary charges accumulated in the light receiving section of the CCD iR image element 11 are transferred to the vertical transfer CCD, and exposure is started. Here, if the shutter speed TV is 1/60 seconds, one forced accumulation control pulse p'rGa is output at the same time as the regular accumulation control pulse CTG.

The MPU 15 waits for the pulse VD to rise to "H" and then sets the switching pulse PS to "H" (steps 84 and 85). As a result, a high-speed transfer pulse from the clock generator 14 is input to the CCD image sensor 11, and unnecessary charges from the vertical transfer COD are swept out in a short time before the next periodic accumulation control pulse CTG is output. .

The MPU 15 waits for the output of the high-speed transfer pulse to finish while setting the switching pulse to "H", and when finished, returns the sweep request pulse PHV to 'L' and outputs the REC.
Bake the gate (steps 85-87). The above processing makes it possible to record signal charges read out from the CCD image sensor 11.

After the pulse VD falls, the clock generator 14
A periodic accumulation control pulse CTG and a transfer pulse are output from , and the signal charges accumulated during the shutter speed TV are transferred to the vertical transfer CCD. Then, the signal is read out by a read pulse outputted from the clock generator 14, and recorded on the magnetic disk 20 as a video signal via the recording/reproducing section 19.

When recording is finished, the MPU 15 closes the REC gate, proceeds to END processing, and enters a standby state waiting for the release button 23 to be pressed (steps 88 and 89).

As explained above, according to this embodiment, in the movie mode and still mode, the forced accumulation control and sweep out of unnecessary charges accumulated in the previous field are executed immediately before the start of exposure, so that the exposure time is If they are the same, they are performing the same operation. Therefore, it is now possible to obtain images of the same quality and precision in movie mode and still mode.

In the above embodiments, an interline transfer type CCD image sensor without a memory area was exemplified as a type of CCD image sensor, but the present invention is not limited to this. The invention is applicable.

"Effects of the Invention" As is clear from the above description, according to the present invention, when recording in movie mode, the forced accumulation control signal and the sweep signal are activated after the output of the readout signal for reading out unnecessary charges is completed. As in still mode, the charges accumulated in the light receiving section in the field immediately before the start of exposure are swept out in a short time before the start of exposure, so there is no difference in noise, smear level, etc. in movie mode and still mode. , and the same image can be obtained.

Furthermore, since there is no difference in image quality between movie mode and still mode, it is possible to record at a desired time with the same high image quality as still mode while monitoring in movie mode.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of an image sensor driving device according to the present invention, and FIG. 2 is a timing chart of the image sensor driving device shown in FIG. 1 in movie mode. 3 is a flowchart regarding the operation in the movie mode; FIG. 4 is a timing chart of the image element driving device in the still mode; FIG. 5 is a flowchart regarding the operation in the still mode; The figure shows an example of a specific circuit of the inversion type driver of the driving device for the image element, FIG. 7 is a timing chart of the inversion type driver shown in FIG. 6, and FIG. FIG. 1 is a timing chart regarding the storage control operation of the image sensor drive device shown in FIG. 1, and FIG. 9 is a timing chart of the conventional image sensor in movie mode. DESCRIPTION OF SYMBOLS 1... CCD image pick-up element (image pick-up means), 2... Driver (control means), 3... Electronic shutter control circuit (control means/means), 4...
・CCD driving clock generator (pulse signal output means), 5...MPU (control means),

Claims (5)

[Claims] (1) Imaging means equipped with a light receiving section that converts incident light from a subject into signal charges and accumulates them, and a vertical transfer section that temporarily holds the signal charges accumulated in this light receiving section; An accumulation control signal is periodically outputted to the imaging means to cause the signal charge accumulated in the light receiving section to be transferred to the vertical transfer section, and a signal transferred to the vertical transfer section after the output of the periodic accumulation control signal is outputted. A pulse signal that outputs a readout signal for sequentially reading out charges, and outputs a sweepout signal at a predetermined time for a predetermined period of time when a sweepout request signal is input from the outside for a short period of time. output means; and control means for outputting at an arbitrary timing a forced accumulation control signal for transferring the charge in the light receiving section of the imaging means to the vertical transfer section, and outputting the sweep-out request signal together with or alone with the forced accumulation control signal. An image pickup device driving device, wherein the control means outputs a sweep request signal for sweeping out unnecessary charges during normal recording. (2) In claim 1, when the sweep request signal is input, the pulse signal output means outputs the sweep signal.
A driving device for an image sensor, characterized in that it starts after outputting a readout signal ends and ends before outputting a periodic accumulation control signal. (3) In claim 1, during normal recording, the control means outputs a forced accumulation control signal and a sweep request signal after outputting the periodic readout signal in a field immediately before accumulating signal charges for recording. . A driving device for an image sensor, further comprising outputting a sweeping request signal in a field where signal charges are being accumulated. (4) In claim 3, when the sweep request signal is input, the pulse signal output means outputs the sweep signal.
A driving device for an image sensor, characterized in that it starts after outputting a readout signal ends and ends before outputting a periodic accumulation control signal. (5) In claim 1, when the electronic shutter is operated, the control means transfers the charge of the light receiving section to the image pickup means to the vertical transfer section at a predetermined timing after stopping the periodic readout signal output from the pulse signal output means. The pulse signal output means outputs a forced accumulation control signal to be transferred to the terminal and also outputs a sweep request signal, and the pulse signal output means starts outputting the sweep signal after the output of the forced accumulation control signal is finished, and when the periodic accumulation control signal is output. What is claimed is: 1. A driving device for an image sensor, characterized in that the driving device ends before the image sensor is driven.