JPS60117974A - Electronic still camera - Google Patents

Abstract

PURPOSE:To obtain a still picture free from the blooming smear even with use of a solid-state image pickup element having defective blooming smear characteristics, by discontinuing the reading of the signal charge within a vertical scanning period that includes even a slight period for opening of a shutter and sweep-out of the stored electric charge. CONSTITUTION:When a relay switch is pushed in an image pickup mode, a shutter control signal generator 111 produces at a time point t1 a shutter control signal which is kept at a high level for the time width TS of the shutter speed and synchronously with the front edge of a vertical synchronizing signal VS led by a synchronizing signal generator 108. Thus a shutter 102 is opened for a period t1-t3. The 1st read-out stopping signal generator 107 produces the 1st read-out stopping signal by the shutter control signal and the signal VS. While a sweep- out drive control signal is produced from a sweep-out drive control signal generator 502 by the shutter control signal. These signals are led to the 2nd read- out stopping signal generator 501 to produce a read-out stopping signal which is set at a high level for a vertical scanning period that includes even a slight period for opening of the shutter 102 and sweep-out of the stored electric charge.

Description

[Detailed description of the invention] Industrial applications The present invention relates to an electronic still camera that records still images.

Conventional configuration and its problems The basic configuration of an electronic still camera is as follows: A subject image formed by an imaging optical system is converted into a still image signal using an imaging means, and this still image signal is stored in a storage means. As shown in FIG. 1, a subject image is formed on the imaging surface of a solid-state image sensor 103 by a lens 101, but normally a shutter 102 blocks incident light.

The solid-state image sensor 103 is driven, such as charge accumulation and signal reading, in response to a drive circuit 106 that is synchronized with a synchronization signal generated by a synchronization signal generator 10B. The output signal from the solid-state image sensor 103 is processed by a signal processing circuit 104 into a signal format suitable for recording and sent to the recording device 103.
5.

Note that in the normal state (when not capturing an image of the subject), incident light from the subject is blocked by the shutter 102, but since dark charges are generated, the solid-state image sensor 103 does not perform normal operations in order to remove this charge. A signal corresponding to this dark charge is guided to the recording device 105, but the control signal from the recording control signal generator 109 prevents recording.

When capturing an object image, when the release switch 110 is pressed, a trigger pulse as shown in FIG. The signal VS (shown in the waveform of FIG. 2(a)) changes from LOW to HIGH in synchronization with the vertical synchronization signal s at time t1.
FIG. 2 (C
) is obtained, and this signal controls the shutter 102 to be in the open state. However, it is assumed that the shutter 102 is controlled so that the high period of this pulse is the shutter opening, and the low period is the shutter closing. When the shutter 102 is opened, a subject image is incident on the solid-state image sensor 103. Then, the shutter control signal shown in FIG. 2(C) is guided to the readout stop signal generator 107, and the vertical synchronization signal vs causes the shutter control signal to become Lo at tl at the same time as the rise of the shutter control signal.
rises from w to High, and the shutter control signal goes High.
The first vertical synchronization signal after changing from h to LowlC vs
The readout stop signal (H
(reading stop at ``high'') is generated.

This readout stop signal is guided to the drive circuit 106 to stop reading out charges from the image sensor 103, and a charge image corresponding to the subject image is accumulated in the solid-state image sensor 103.

The read stop signal d is synchronized with the vertical synchronization signal a at t2.
When the signal becomes Low at time t2 to t4, reading out of the signal charges accumulated in the solid-state image sensor 103 starts.
One frame signal is read out in two vertical scanning periods. The read signal is processed by the signal processing circuit 104 and sent to the recording device 105 as a one-frame signal as shown in FIG. 2(e).

On the other hand, the read stop signal d and the vertical synchronization signal a are also guided to the recording control signal generator 109, and the two vertical scanning periods after the read stop signal d changes to Low are 12 to t4.
A recording control signal as shown in FIG. 2(f) which remains High for a period of
The recording of one frame of still images is completed. It goes without saying that a synchronizing signal is also sent to the signal processing circuit 104 and the recording device 105 from the synchronizing signal generator 10B, so that the cycle of the entire system is maintained.

Conventional electronic still cameras configured as described above have the following drawbacks.

In general, solid-state image sensors have the drawback of blooming and vertical smear phenomena in which reproduced images are impaired by high-brightness objects, and the quality of reproduced images is greatly degraded. When a solid-state image pickup device having such blooming/vertical smear phenomena is applied to the conventional electronic still camera shown in FIG. 1, blooming/vertical smear also occurs in still images due to the following mechanism, degrading the image quality.

Interline transducer type CCD (hereinafter referred to as IL-COD) is the most commonly known solid-state image sensor.
) will be used in the explanation.

FIG. 3 is a basic configuration diagram of an IL-COD, in which 301 is a semiconductor substrate, 302a and 302b are a large number of light receiving parts arranged in a matrix on this semiconductor substrate 301, and 1 One light receiving section corresponds to one picture element.

303 is a light receiving section 302a, 302 in the horizontal scanning direction.
Vertical transfer registers extending in the vertical direction are provided in the same number as the number b, that is, the number of horizontal picture differences, 304 is a horizontal transfer register 305a for transferring accumulated charges to the output terminal side.

Reference numeral 305b denotes a transfer gate for transferring the charges of the light receiving section 302a and 302b to the vertical transfer register. In order to obtain imaging output from this solid-state imaging device, - First, each light receiving section 3
02a and 302b accumulate signal charges according to the subject image, and transfer the signal charges during the vertical blanking period)3
05a and 305b are opened and each vertical line is transferred (parallel) to the vertical transfer register 303. Then, each vertical register 303 sequentially transfers the data in the vertical direction during the horizontal blanking period for each horizontal scanning period to the horizontal transfer register. 304. Then, the signal charge is transferred horizontally in the horizontal transfer register 304 over one horizontal period, and a desired video output is obtained at the output terminal.

In the case of telephotography applications, it is necessary to perform interlaced scanning, but in this case, in the odd field, the transfer group corresponding to the light receiving section 302a of the odd horizontal pixel column)
302a is opened and only the charge of the light receiving section 302a is transferred to the vertical transfer register 303, transferred by the vertical transfer register 303 and the horizontal transfer register 304, and output as a field image.
The charges in the light receiving portions 302b of the remaining even-numbered horizontal pixel columns are transferred to the vertical transfer register 303.
and horizontal transfer register 304 to obtain the remaining field images. One frame image is formed by these two field images. In FIG. 3, solid line arrows represent odd field transfers, and broken line arrows represent even field transfers, and charge transfer within the vertical transfer registers 303 and horizontal transfer registers 304 is odd, By applying this type of IL-CCD image sensor, which is common to even fields and is transmitted in the direction of the arrow shown in the figure, to the image sensor 103 of an electronic still camera whose basic configuration is shown in FIG.
Consider a case where an image is taken of a subject that includes a high-luminance object that causes pluming smear. Release switch 11
When 0 is pressed, a trigger pulse shown in FIG. 4 is generated, and this pulse and the trigger pulse shown in FIG.
-), the shutter control signal generator 111 generates a signal at a time t1 as shown in FIG. 4(C).
from Low to High in synchronization with the rising edge of the vertical synchronization signal.
A pulse signal that rises to high and remains in a high state for the time width Ts set by the shutter speed setting device 112 is obtained. And this pulse signal is High
The shutter is opened only during the period t1 to t3 in this state, and the subject image is incident on the IL-CCD image sensor. Then, the shutter control signal shown in FIG. 4(C) is guided to the readout stop signal generator 107, and the readout stop signal (
(reading is stopped during the High period). This read stop signal is guided to the drive circuit 106 and the IL7C
Stop reading charge from OD.

The charge reading stop here will be explained by using both the stop of vertical transfer and the stop of charge transfer from the light receiving section to the vertical transfer register.

9. During the period when the read stop signal is High, the supply of the transfer gate pulse to the transfer gate and the supply of the vertical transfer pulse to the vertical transfer register are stopped. This situation is shown by the waveforms in FIGS. 4(e), (f), and (h).

(e) and (f) are the transfer gate pulses for odd-numbered horizontal pixel columns and the transfer gate pulses for even-field horizontal pixel columns, respectively, and are configured to open the transfer gate in the High state, and originally one field. The odd and even transfer gates open alternately every time, but during the period when the readout stop signal is High, the pulses that should originally be supplied are not supplied, as shown by the broken line arrows in Fig. 4(e) and (f). Therefore, the charge in the light receiving section is not transferred to the vertical transfer register and remains accumulated in the light receiving section. In addition, (h) in the same figure shows the transfer pulse of the vertical transfer register, and the read stop signal is High.
During the period t1 to t2 of h, no transfer pulse is supplied, and the charges existing in each stage of the vertical transfer register are not transferred and remain accumulated in each transfer stage.

Therefore, while the shutter is open (period 11 to t3), I
The charges corresponding to the subject image incident on the L-CCD image sensor are accumulated at the location where they were generated until the next transfer starts.

A large number of light receiving units (302a) within the IL-CCD.

5o2b), in the light-receiving section where the high-intensity object image is incident, a charge greater than the amount of charge that can be accumulated in the light-receiving section is generated, and this excess charge is transferred (305a).

306b) is in the closed state, it diffuses into the deep part of the semiconductor substrate 301, leaks into the surrounding vertical resistors, and is accumulated there.

Then, in synchronization with the first vertical synchronization signal immediately after the shutter closes, a transfer gate pulse and a vertical transfer pulse are supplied, and normal reading of signal charges is started. Immediately after the start of readout, the first field contains signal charges corresponding to the subject image accumulated in the light-receiving section of either the odd-numbered pixel row or the even-numbered pixel row, and the signal charge generated by the high-brightness object as described above. Therefore, the excess charges that remain accumulated in the vertical transfer register are added together in the vertical transfer register and read out at the same time.
As shown in the signal waveform for the period t2 to t4 of waveform q), a video output with pluming smear, which is different from the video output due to the original signal charge accumulated in the light receiving section, is obtained. On the other hand, in the second field, the excess charge previously accumulated in the vertical transfer register has already been transferred and disappeared in the first field, so the output charge is transferred to the remaining received light. Only the signal charge accumulated in the waveform t4 to t of FIG.
As shown in the signal waveform of period 5, the original video output without false signals such as blooming can be obtained. Therefore, the video output of the first field and the second field are different signals, and the video of these two fields is If the signal is recorded by the recording device 105 and the frame image is reproduced, the result will be a poor image with flicker and blooming.

Next, the case where a MOS type or priming transfer method (CPD type) solid-state image sensor is used as the solid-state image sensor 103 in FIG. 1 will be explained using the signal waveform diagram in FIG. 2.

In the case of MOS type or CPD type solid-state image sensor,
Reading out the charge from the image sensor is stopped, and the shutter is opened only during the period shown in FIG. 1 103 to allow light from the subject to enter the image sensor. Charges corresponding to the light are generated and accumulated in the light-receiving section, and charges other than the charges that can be accumulated overflow from the light-receiving section corresponding to the high-luminance object and are accumulated in the neighboring vertical signal lines.

Then, when charge readout begins in synchronization with the vertical synchronization signal immediately after the shutter closes, most of the charge accumulated in the vertical transfer line (pluming smear charge) is read out in one horizontal scanning period immediately after the start of readout. Been,
The video signal of the one horizontal scanning period is damaged and a normal still image cannot be obtained.

As described above, when a solid-state image sensor with poor pluming and smear characteristics is used in a conventional electronic still camera, there is a drawback that only still images of poor image quality are obtained. Moreover, most of the current solid-state image sensors do not have good blooming and smear characteristics, and in order to improve these characteristics, the device structure becomes complicated, which inconveniently worsens manufacturing yield and causes a decrease in sensitivity. is also occurring.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide an electronic still camera that can obtain good still images without blooming and smear even when using a solid-state image sensor with poor blooming and smear characteristics. That is.

Structure of the Invention The EA of the present invention has two light receiving sections and a transfer section that are independent of each other.
dimension! a solid-state image sensor, a lens for forming a subject image on the solid-state image sensor, a shutter disposed on an optical path between the solid-state image sensor and the subject, and after the shutter transitions from an open state to a closed state. A means for sweeping out the charge accumulated in the transfer section before that, and a vertical scanning period in which there is at least a period in which the shutter is kept open and a period in which the sweeping operation is performed are provided in the two-dimensional An electronic still camera is equipped with a means for stopping the reading of signal charges corresponding to a subject image accumulated in a light receiving section of a solid-state image sensor, and even if a solid-state image sensor with poor blooming and smear characteristics is used, It is possible to obtain still images without blooming smear.

Description of examples Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 5 is a configuration diagram showing a first embodiment of the present invention,
The same parts as in FIG. 1 of the conventional example are given the same reference numerals, and the operations in the normal state (when no subject image is taken or recorded) are the same, so a description of this state will be omitted.

Further, the solid-state image sensor 103 is an IL-CO shown in FIG.
This will be explained as D.

When capturing an object image, when the release switch is pressed, a trigger pulse shown in FIG. vs (Fig. 6 0
Shown as 0 waveform. At time t1, the signal rises from Low to High in synchronization with the leading edge of the vertical synchronization signal.
A shutter control signal shown in FIG. 6(c) is obtained which is in a high state for the time width Ts set by the shutter speed setting device 112, and the shutter 102 is controlled by this signal, and the pulse is in a high state from t1 to t.
During period 3, the shutter 102 is opened and the subject image is at IL-
The light is incident on the CCD 103. The shutter control signal shown in FIG. 6(c) is then guided to the first readout stop signal generator 107, and the shutter control signal shown in FIG.
A first read stop signal is generated as shown in FIG. On the other hand, the shutter control signal is also guided to the sweep drive control signal generator 502, and has a waveform as shown in FIG. 6(e).
At an arbitrary moment t7 after the shutter control signal changes from High to Low, a sweep drive control signal is generated which rises from Low to High and remains in the High state for a period of time Ta. The sweep drive control signal is guided to the sweep drive circuit 603, and is shown in FIG.
), the high period of the signal (t7 to t
A sweep drive pulse for driving the vertical transfer register of IL-COD is generated for only 8 periods).

The frequency fa of this sweep drive pulse is IL-COD
Of the vertical transfer register stages, the one furthest from the horizontal transfer register (therefore, the charge stored there is the slowest)
If the number of stages of the vertical transfer register is Nv, then 8≧Nv/T so that the charges accumulated in the stages (even if they are output from the IL-COD) can be swept out.

On the other hand, the sweep drive control signal (FIG. 6(e)) and the first readout stop signal (FIG. 6(d)) are guided to the second readout stop signal generator 601, and the shutter 102 is opened. Vertical scanning period (in this case, t1 to 16
) is in the High state.
The waveform shown in figure (a)) is generated.

Then, this readout stop signal is guided to the drive circuit 106, and as shown in the waveforms of FIG. Among them, the transfer gate pulse of the odd horizontal pixel row,
Transfer gate pulse for even horizontal pixel columns, vertical transfer pulse (
Regular pulses that match the television set scanning frequency are cut off. Therefore, a regular vertical transfer pulse is not applied to the vertical transfer register of IL-CCD 1o3 during the period t1 to t6, and during the period t7 to t8 of this period, the waveform shown in FIG. 6(i) is A sweeping pulse is applied.

Therefore, considering the charges generated in the IL-CCD, among the charges generated according to the subject image when the shutter is opened, the charges generated in the light receiving section remain accumulated in the light receiving section until time t6.

On the other hand, in the vertical transfer register around the light-receiving part where the high-brightness object image of the subject image is incident, the charge that cannot be accumulated in the light-receiving part and overflows is accumulated.
8 (output waveform from period t7 to t8 in FIG. 6(i)), and there is no charge in the vertical transfer register. After this state is reached, the read stop period ends at t6, and I
When all the drive pulses are applied to the L-COD, only the charges accumulated in the light receiving section when the shutter was open are read out during the period from t6 to t6, and the resulting signal output is As shown in the signal waveform for the period t6 to t5 in the waveform of FIG. Then, if a control signal is generated that causes the recording device 106 to enter the recording operation mode only during the period t6 to t5, and the video signal for the period t6 to t6 is recorded, a good one-frame portion without blooming etc. is generated. You can take and record still images.

In addition, in the above explanation, the vertical transfer pulse is cut off along with the feeding gate pulse during the readout stop period, but even if the vertical transfer pulse is not cut off, if the transfer gate pulse is cut off, the light receiving section can be Since the accumulated charge is not read out and the readout stop function is achieved, such a configuration may be configured such that a sweep drive pulse is applied instead of the vertical transfer pulse during the sweep drive period.

Next, a second embodiment will be described.

FIG. 7 is a block diagram of the second embodiment of the present invention, and FIG. 8 is a waveform diagram showing its operation. By using the first vertical blanking period immediately after changing from the open state to the closed state, the readout stop period is shortened, the amount of dark charge generated in the light receiving section during this period is reduced, and high-speed photography is possible. It is something that has been trained. In FIGS. 7 and 8, the same parts and signal waveforms as in FIGS. 5 and 6, respectively, are indicated by the same reference numerals and symbols, and only the differences will be explained.

, the sweeper control signal (waveform (C) in FIG. 8) is guided to the first readout stop signal generator 107 to generate a readout stop signal (waveform (d) in FIG. 8), and also generates a sweep drive control signal. Guided by generator 702, shutter 102
Any time during the vertical blanking period (period t2 to t6) immediately after the switch changes from the open state to the closed state, up to the moment when the transfer gate pulse is generated (time -19)
From t7 to t8), a sweep drive pulse with a frequency equal to or higher than P is applied to the vertical transfer register by the sweep drive circuit 703 (FIG. 8(i>)), Therefore, the blooming charge that was generated by the high-brightness object while the shutter was open and was stored in the vertical transfer register can be discarded (ms diagram i shape (i)).
) The video waveform output from the L-ccD during the period from mt7 to t8), and then the readout stop signal changes from High to Low.
When all drive pulses are applied to IL-COD, a good frame with no false signals such as blooming is generated, as shown in the waveform of FIG. 8(i) during the period from 16 to t6. You can get a video output of 1 mm. Then, by recording this output signal, photographing and recording of a good still image is completed.

In the waveform diagram of FIG. 8, as shown in the waveform (h'), vertical transfer pulses are also added during the readout stop period (t1 to t2), and only transfer pulses (q) and (q') are applied. However, as described above, the reading stop function can be achieved even in this case.

Furthermore, since there is no need to operate the vertical transfer register during the vertical blanking period, no vertical transfer pulse is applied during this period, making it easier to apply the sweep drive signal.

Further, as in the second embodiment shown in FIG. 7, the sweep drive signal is applied to the vertical transfer register of the IL-COD only during the first blanking period immediately after the shutter changes from the open state to the closed state. Even if the configuration is such that a sweep drive signal is always applied during the vertical blanking period, the shutter is opened after the unnecessary charge accumulated in the vertical transfer register is discarded, and the IL-C
Only the charge accumulated in the light receiving part of the OD can be detected,
In this way, the sweep drive control signal generator 7 shown in FIG.
This has the effect that 02 can be omitted. A configuration diagram of this example is shown in FIG. 9, and a waveform diagram is shown in FIG. 1. In addition,
In this third embodiment, since the sweep drive signal is applied to all vertical blanking periods by the sweep drive circuit 903 (FIG. 10(i'), there is even a small period in which the shutter is open. During the vertical blanking period immediately after the vertical scanning period, the sweep drive generates a signal that occurs during the immediately preceding vertical scanning period, as shown in the waveforms of tl.~'11 and t7-t8 in FIG. 10 (j'). The smear blooming charge accumulated in the vertical transfer stage is then output.

In this way, the second. According to the third embodiment, the period during which signal charges are accumulated in the light receiving section can be shortened compared to the first embodiment, and it is possible to perform continuous shooting at a higher speed. The amount of dark charge (proportional to the accumulation time) generated in the storage area can also be reduced.

Next, a fourth example of actual Am will be explained.

Fig. 11 is a configuration diagram of the fourth embodiment of the present invention, and Fig. 12 is a waveform diagram showing its operation.The difference from the first embodiment is that the shutter changes from an open state to a closed state. The sweep operation is achieved by making the subsequent transfer gate pulse cut-off period longer than the vertical transfer pulse cut-off period by at least one vertical scan period, thereby eliminating the need for a separate sweep drive signal generator. In both FIGS. 11 and 12, the same parts and signal waveforms as in FIGS. 5 and 6, respectively, are indicated by the same reference numerals and symbols, and only the differences will be explained.

The shutter control signal (FIG. 12(C)) keeps the shutter 102 open for a period of t1 to t3, and
The readout stop signal generator 107 generates a first readout stop signal as shown in the waveform (d) of FIG. Then, the readout stop signal is guided to the sweep drive control signal generator 11o2, and is determined by the vertical synchronization signal at the point immediately after the readout stop signal changes from High to Low.
A sweeping drive control signal is generated as shown in FIG. 12(e), which remains in a High state only during the vertical scanning period (period t2 to t6).

This sweep drive control signal is then led to the second read stop signal generator 501, and is logically summed with the first read stop signal to generate t as shown in FIG. 1-2 (a).
A second read stop signal is generated which is in the High state for a period from t1 to t6, and this signal is guided to the drive circuit 106 to read from t1 to t6 as shown in FIGS. 12(q) and (q').
The transfer gate pulse is cut off for a period of ((9) in the same figure).
, (q') arrows shown with broken lines represent the state of being blocked. ), reading out the charge corresponding to the subject image generated in the light receiving section is stopped. On the other hand, the first read stop signal is guided to the drive circuit 106 and interrupts the vertical transfer pulse only during the High period (period 11 to t2) of this signal. (Waveform (h) in Figure 12) Therefore, during one vertical scanning period from t2 to t6, the charge in the light receiving section is not read out, but the charge accumulated in the vertical transfer register is read out, and while the shutter is open. All of the smear and pluming charges generated by the high-brightness object in the subject image incident on the photodetector are read out (waveform in Figure 12 (waveform from t2 to t6 in D)). During the reading period from t6 to t5,
Smear pluming charge disappears, 12th
As shown in the video output waveform from t6 to t5 in FIG. It is possible to photograph and record good still images without blooming or smear using a solid-state image sensor with poor quality.

Note that in the above explanation, the first read stop signal is Hi.
Although it has been explained that the vertical transfer pulse is cut off during the period gh as shown in FIG. As shown, even if the vertical transfer pulse is always applied to the image sensor, if the transfer pulse is interrupted only for the necessary period, it is possible to stop reading out the charge corresponding to the object image generated in the light receiving section. During the period from t6 to t6, a smear waveform as shown in the waveform for the period from t6 to t5 in FIG.
As mentioned above, good video output without blooming can be obtained. In this case, the charges corresponding to the smear pluming charges generated in the vertical transfer stage during the period t1 to t2 are also read out, and the charges in the vertical transfer register are continued.

As described above, the fourth embodiment has the advantage of simplifying the configuration since it is not necessary to provide a separate sweep drive signal generator.

In addition, in the above embodiment, IL-CO is used as the solid-state image sensor.
Although we have explained the case where D is used, MOS type or CP
In the case of a D-type solid-state image sensor, the smear blooming charges accumulated in the vertical signal line can be removed by transferring charges after the vertical signal line for at least one horizontal scanning period.
Therefore, in order to obtain a still image without smear blooming, the vertical signal is It is sufficient to transfer charge from the line to the output stage, and the most practical method is to transfer charge from the vertical transfer line to the output stage, and at least one horizontal A possible method is to start the scanning period before the scanning period. In this way, the readout of the charge from the light receiving section is generally started at the same time as the start of the vertical effective scanning period or before that (in other words, within the vertical blanking period), so that the charge is not accumulated in the vertical transfer line. The generated smear and pluming charges can be read out during the vertical blanking period, thereby eliminating any adverse effects on the resulting video output.

Effects of the Invention As described above, according to the present invention, an electronic still camera can be obtained that can obtain good still images without smear blooming using a solid-state image sensor with poor smear blooming characteristics.

In addition, solid-state image sensors with poor smear/blooming characteristics can be used in such electronic still cameras, and therefore solid-state image sensors do not require smear/blooming countermeasures, simplifying the configuration and making manufacturing easier. It is possible to easily lower the cost. Furthermore, the area that was conventionally used to prevent smearing and pluming can be used for light reception, making it possible to improve sensitivity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of a conventional electronic still camera, FIG. 2 is a signal waveform diagram to explain its operation, and FIG. 3 is a schematic diagram showing the structure of an IL-CCD solid-state image sensor. 4 is a signal waveform diagram showing the operation when the IL-COD shown in FIG. 3 is applied to the conventional electronic still camera shown in FIG. 1, and FIG. 5 is a signal waveform diagram showing the operation when the IL-COD of FIG. FIG. 6 is a block diagram showing the first embodiment, FIG. 6 is a signal waveform diagram for explaining its operation, and FIGS. 7, 9, and 11 are respectively the second embodiment of the present invention. Third. FIG. 8 is a block diagram showing the fourth embodiment, and FIGS. Third. FIG. 7 is a signal waveform diagram for explaining the operation of the fourth embodiment. 101... Lens, 102... Shutter, 103... Solid-state image sensor, 104...
... Signal processing circuit, 105 ... Recording device, 1
06... Drive circuit, 107... First read stop signal generator, 501... Second read stop signal generator, 602°702.1102...
...Sweep drive control signal generator, 503.703
．． 903...Sweeping drive circuit, 108...
...Synchronization signal generator. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure//2 Figure 2 Figure 3 3θ3 Foil 4 Mouth 5 Factor l12 Figure 6/ / 14 Otsu 6 Figure 7//2 Hanging 8 Figure t4 ts Figure 9 ttz Figure 10 Figure 11 Cause 12 figure

Claims (3)

[Claims] (1) A two-dimensional surface imaging device having a mutually independent light receiving section and a transfer section, a lens for forming a subject image on the solid-state imaging device, and a lens disposed on an optical path between the solid-state imaging device and the subject. a shutter that has been opened, a sweep operation means that reads out the charge accumulated in the transfer section before the shutter transitions from an open state to a closed state, and a vertical shutter that has a period during which the shutter is kept in an open state. A vertical scanning period in which the scanning period and the period during which the sweep-out operation is performed are at least slightly within the effective scanning period,
An electronic still camera characterized by comprising a readout stop means for stopping readout of signal charges accumulated in the light receiving section of the two-dimensional surface image sensor. (2) The electronic still camera according to claim 1, wherein the sweeping operation is performed at least during the first vertical blanking period immediately after the shutter changes from the open state to the closed state. (3) As a two-dimensional surface solid image sensor, at least a light receiving section,
Using an interline transfer type COD, which includes a vertical transfer register section and a transfer means for transferring signal charges from the light receiving section to the vertical transfer register section, the means for stopping readout of the signal charges is configured by blocking at least the transfer means. The sweep operation means stops reading out the signal charge, and the sweep operation means performs the above operation for at least one vertical scanning period at the normal television scanning frequency in synchronization with the first vertical synchronization signal immediately after the shutter changes from the open state to the closed state. 2. The electronic still camera according to claim 1, wherein the sweep operation is performed by operating a vertical transfer register section.