JPS58116881A - Image pickup device - Google Patents

Abstract

PURPOSE:To allow one-shot image pickup operation by providing a shutter for inhibiting light incidence to an image pickup element during a charge transfer period in still mode, and then suppressing the generation of a smear and stopping sampling in accompanied with a switching to still mode. CONSTITUTION:An image pickup device is provided with an aperture means AP for measuring object luminance and an optical system provided with a shutter means SHT, storage time setting circuit SE1, storage time indication setting circuit SE2, aperture value setting circuit SE3, etc. Outputs of those respective circuits SE1-SE3 and the output of a light metering means are processed by an arithmetic circuit OP and on the basis of the arithmetic result, an ammeter AM for the means AP and a magnet Mg for the SHT are controlled to control the quantity of light mode incident to the device. Further, successive and still mode switches SW1 and SW2 are provided to switch scans of the image pickup means, and to switch exposure parameters to be inputted to the circuit OP through gates G4 and G5. Then, an AND circuit stops the holding of a sample holding circuit SHC.

Description

[Detailed description of the invention] Book! #IQIj#i The present invention relates to an imaging device that can easily switch between continuous shooting and one-shot shooting.

In conventional video cameras, only continuous m images are possible)
, it would have been impossible to have a one-shot show. The present invention aims to provide an improved imaging device capable of resolving such problems. To this end, the present invention provides an improved imaging system that is capable of resolving such problems. By operating the switch means 9, the synchronizing signal generating means is switched in order to perform new accumulation and scanning completely different from the previous scanning period.

Also, in general, the storage means temporarily stores the video output from the imaging means during the II output harammeter only during this still mode, and this memory can be reset periodically and this reset can be done by switching to the still mode κ. Canceled, and
Since the content of the previous episode is transferred to the first mode, even if the still mode enters 4Ii during the continuous mode, the monitor will not be disturbed.

In addition, the present invention has a means for periodically sampling and holding a part of the output of the image refining means during the continuous mode, and uses this output as subject number information, and also uses this output when switching to the still mode. /! By stopping the continuous mode, the information in continuous mode can be used as is.

Furthermore, since a shutter is provided to prohibit light from entering the ms element at least during the double transfer period in the still mode, the occurrence of smear can be suppressed.

The present invention will be described in detail below based on the inside.

Published by Giav Co., Ltd. A block diagram showing an example of the configuration of the device of the present invention, a diagram showing the timing of the main parts of the second block, and a fifth block diagram showing the mode selector and continuous mode instruction circuit layer shown in the first diagram The fourth reason for discussion is the schematic configuration of the image sensor.

In the figure, L8 is the imaging optical system, P is the pattern, 8) IT processing circuit, 8 (red) from the MTxIf1 process circuit, G (
2)), B(f) output with color difference 41(fL-Y), (B
-Y) and #Ma) IJ circuit 1P that converts to summer signal Y
82 company recording signal processing path, 811 is recording head sm'
h = PGd 'Rusmo!' for driving the 0M2a Binion Kia 7PG which are the Rack Kia and Binion Kia for shifting the head one track at a time. , aMC Corporation A shift control circuit that synchronizes the pulse motor M2 with, for example, a 1 series synchronization signal from a sequence control circuit 8CTL, which will be described later. be rotated. This is a circuit for controlling the rotation of the motor MC#i. Note that the output of the matrix circuit MTx can be connected to a monitor device via a switch SW4. DRI is a driver circuit that generates drive pulses for storing, transferring, reading, etc. the image sensor ID.
J-period signal generation circuit 8 YNC-case control circuit 8
Synchronization 1it11141 is performed by the output of C'r L.

ch is a reference signal generator. IG is an integrating circuit that extracts and integrates the YgN signal from the output of the matrix circuit MTX, and h is its reset terminal. This reset terminal R has 1) li] N period signal generator 8 YN C4y
) No. 2 - The output end of the 777171 circuit 08i is connected to form a signal due to the fall of the output as shown.

8HC is a sample and hold circuit according to the present invention, which samples the output of the integration circuit at a sufficient timing and holds it until the next sampling point. 8 One-shot times [082 output is AND gate A] which forms a pulse at the rising edge 9 of the synchronization signal generator output at its sample signal input terminal.
It is input via ND.

The output of the sample hold circuit SHC is input to the calculation circuit OPK, and is calculated together with the output of the accumulation time shell circuit SE1 inputted in advance, the output of the fixed accumulation time indication circuit 8E2, or the output of the aperture value general foot rotation @sm5. Output A or BK is selectively outputted according to the states of control inputs a to C as shown in No. 6 (2).

Note that the output of the husband A mode selector M8 and the continuous mode instruction circuit CD are connected through the control input terminal 1 and the cKId gate circuit or G5. Matagu) G4,
G51ak3. ．． 879y FFf) is controlled by the Q output, and when the Q output is at a high level, q4 opens,
G5 closes. Also, when the 9th output is at a low level, the situation is reversed.

A coil of an ammeter M is connected to the human output of the arithmetic circuit OP via a related drive circuit DR2, and the amount of current applied to the ammeter AM changes depending on the level of the human output. Furthermore, the movable part of the current chuan is configured to change the amount of aperture of the aperture 9P.

Operation time @0Pf)B output terminal #iIy'D converter AD
The output of the reference oscillator is connected to the preset input terminal Pr of the resettable puller/receiver CN via C, and the output of the reference oscillator is input to the clock input terminal CL of the Mukuro Kakume. c6
The output terminal that generates one pulse when the clock is counted up to one preset value is the reset input terminal (8Fi), and the reset terminal (L/FI) is connected to the Q output of the trigger FF. Also, the output terminal C rises with sufficient pulse width (second tuna medium Ts)! It is input to the shutter drive circuit 6 through the one-shot circuit 086 of the 11il1 period, and the output of this one-shot i path energizes the magnet so as to close the shutter only at the I level. Note that the shutter according to the present invention is different from the conventional shutter for silver halide film, and is designed to prevent light from entering the receiving jtS during the transfer period from the light receiving section of the photodetector to the storage section. The town is being encouraged to open the normal line, as mentioned above! Light is cut off from entering the image sensor only while the magnet is energized.

The output of the 777171 circuit 085 is connected to the 7 rip hoop yyo through the multi-synchronized one-shot circuit.
It is input to the v set end. G) 1 is a placement playback head according to the present invention, which outputs the video output of the recording signal 4611 circuit PS2 to a predetermined track of the magnetic disk D while the Q output of the Fritz 1 Frog FF is at a low level. Can be recorded via switch 8W5, and
When the Q output of the flip-flop becomes high level, @
By switching to @, the recorded video signal is sent to the reproduction signal processing circuit PS3 via a conductive switch &W4 and monitored by a monitor device MTVK. The switches 8W3 to 8W5 are configured to switch to the side when the output of the flip-flop FFf)Q is at a high level, and to the d@ side when the output is at a low level. Further, the 1-flip float 1FF is configured as shown in the figure, and is set by turning on the still mode start switch SW2. Also 8W
1 is a continuous mode start switch which, when turned ON, starts the motor control circuit RMC.

Note that the Q output of the above-mentioned flip-frog is connected to the remaining input terminal of the AND circuit ND.

Further, in the still mode of the present invention, the sequence control circuit 8CTL outputs the driver circuit REL 1eC drive control signal instead of the synchronization signal generation circuit 8YNC, and in the continuous mode, the head RH is synchronously shifted by the shift motor control circuit. Provides a synchronization signal for

Next, the operation of the first frequent block diagram will be explained based on FIGS. 1 to 4. When the continuous mode switch 8W1 is turned on, the motor control circuit RMC is started, the rotation of the disk D is started, and the imaging system etc. are driven, and the synchronization signal generation circuit 8YNC outputs a synchronization signal with a period T as shown in m2, for example.
・Output.

This period is set to TI, for example, V ugly seconds. Then, the driver circuit DR1 is connected via this synchronization signal switch BW5.
The pulses Φl to -8 as shown in FIG. 21 are generated. That is, Φl is a transfer pulse that transfers the charge in the light receiving sl to the storage @B, Φ3 is a transfer pulse that transfers the charge of the storage s8 to the horizontal register HR, and -. is the horizontal register HB.
This is a horizontal clock pulse for discharging the charge in the output Angum MK.

In the case of IIg shown in Figure 4, an overflow drain OFD is provided near the horizontal register HR, and it has an anti-broking barrier structure between it and the horizontal register, so reading is performed using pulse Φ$. ZuniΦ1. If only a -1 transfer is performed, excess charge will be absorbed from the horizontal register to the overflow drain.

As shown in Fig. 21, the pulse Φ1. is transferred to storage s8 by Φ2, and during the next low level XQfiaT session, pulse Φ3. - The output signal is shifted to the horizontal register one by one and read out, and the output signal is monitored via the process circuit P81, matrix circuit MTX, and d@ of the switch armor 4.
MTVK is supplied and the recording signal processing circuit P821
d@ of switch SW5, whether the rotation period of the disk is the same as the period T of the synchronization signal σ, which is recorded on the specified F rack of the rotary disc via the head GH, is the same as the period T of the synchronization signal. The company is protected by synchronized control, which is an integral number of times. Further, an erasing head is provided on the same track in front of the recording/reproducing head GH.

In addition, in this continuous mode, for example, the output of the MTX circuit MTXtl) Y signal is periodically integrated by the integrating circuit IG, which is reset at the falling edge of the synchronizing signal, and the integrated output is Immediately before, that is, every time the synchronizing signal rises, it is numbered and held until the next sampling.

Therefore, although the sample-hold circuit output is delayed from real time by a period T minutes, it corresponds to the TTL light value.

By inputting this #8 element value upper calculation circuit OF, lN
It calculates with the input information from the 1111 child and outputs multiple outputs of the clever combination shown in the third tuna to terminals A and B.

Also, the output signals from this person and the B end are signals corresponding to Ay and Tma obtained by, for example, APBX calculation. Also, s''*l indicates the Fi variable.

In addition, each control input end of the arithmetic circuit OP.

Logic inputs as shown in FIG. 6 are inputted from the continuous mode indicating four-way CD or the mode selector M8 for each of b and cfcti. For example, continuous mode switch &lW1 is ON and steel mode switch 8W2 is OFF.

In other words, in the case of continuous mode, control game)G5 fights, goo)G
4 is closed, the output value (010) of the circuit CD is supplied to the input terminals a'-c. As a result, as shown in FIG. 3, a signal corresponding to the diaphragm P is output from the MU terminal to control the diaphragm P. Also, there is no output from the B terminal. In this way, in the continuous mode, the aperture is controlled based on the IIi sample-held side light value, and the accumulation time of the image sensor is added to time T4.

And as mentioned above, along with the video signal being monitored,
Recorded on the track for field memory.

Also, while sequentially switching the tracker every 11 fields,
Video is recorded from the recording head aHK.

Next, after selecting the appropriate mode shown in S-1 using the mode selector M8 and setting the appropriate accumulation time and time using 881.813, the steel mode switch 8W2
When turned ON, the flip-flop FF is set, so the data from the arithmetic circuit 0FF) runt roll input vehicle ~cK#i selector M8 is input, and the FFI is set accordingly.
) Anodogtom N due to the Q output becoming high level.
D is closed, the sample hold circuit 8HC stops the number printing/a, and the III party value light value in the continuous mode is held. Also, since 8W6 to 8W5 are switched to .IIK, first the driver circuit R1 is activated by the drive pulse Φ1. Φ island is supplied as shown in 2nd-. As a result, the light receiving gttl is not completed! Charge is cleared. Further, when the counter CN'l' is counted 9 times and the accumulation time Tl' corresponding to the preselected mode and set value has elapsed, a pulse is output from the C terminal, which is input to the sequence control circuit 8CTL and is then applied to the driver circuit. The transfer of charge from the light receiving section of the image sensor to the storage section via DR1 and the indulgence pulses -1 to -1 from the storage section are initiated. 1 counter CNT) Rise of pulse from C terminal)
In synchronization with this, the one-shot (b) path 083 outputs a pulse with a pulse width T3 shown in the second diagram, and during this time the magnet is activated and the shutter is closed to prevent light from entering the receiving portion.

As a result, at least during the charge transfer period (Ts) from the light receiving 14sl to the storage sS, the 111th shutter closes the incidence, but the key to this is to make the response of the shutter very short as Ts'. This is because there is no problem even if the time is longer than the time Ts'. In addition, in this embodiment, the 7-lip 70-tub PFf)"j set signal is sent to this one-shot circuit 083 in order to return the continuous mode Km from the still mold as soon as the reading of the signal from the camera 48 is completed.
Since it is formed by one shot 084 in synchronization with the fall of SFi, it is desirable to make the total time required for one shutter closing time equal to or longer than T. This is because when you switch to continuous mode quickly, the still mode 2 signal is being read out! This is because there is a risk that the i-ken may be transferred to the storage section. Incidentally, in this embodiment, the binding is Korean T--TI-. Further, in this embodiment, the still mode image is stepped up and down by the switch 8W2.

Also, by ONK of switch 8W2, until then! The video signal supplied from the TRIX circuit MTX to the monitor device is updated one field at a time during the continuous mode and continues to be output as the recorded signal, so that the 1Ii 1 side will not disappear or be disturbed.

In this embodiment, tracks on the magnetic disk are used as the 11 field memory, but the present invention does not add 1114 to such an analog memory.
This can also be achieved by constantly converting the output of the R/R and then temporarily storing it in a digital memory and refreshing it for each field.

In this case, it would be a good idea to switch to the still mode, convert the message content to D/A, and display it on the monitor.

Also, please use the Y signal during this visit! Although it is obtained from the output of the trix circuit, it may also be obtained by combining the output of the process circuit.

The value *S+jt may be obtained by dedicating a part of the light-receiving section of the image pickup device exclusively for capturing light and integrating the output from this section.

However, the imaging means is not limited to a frame transfer CCD such as the one shown in the fourth example, but may also be of the inter-two-indoor, or space-type type.

[Brief explanation of drawings]

Company 11: A block diagram of an embodiment of the m-image device of the present invention. Fig. 2 is a wall timing diagram of the first illustrated circuit. Fig. 6 is a pictorial diagram of the input/output state of the arithmetic circuit OP. Fig. #I4 is a diagram of the input/output state of the arithmetic circuit OP. This is an example of an image sensor applied to an image pickup device. Means, LD, -.9.Image sensor, DRI...driver. Circuit, IG...Integrator circuit, SHC...Sample hold circuit, GH...Memory write/read head, MTV...Monitor device, OP...
...Arithmetic circuit. Hour hand applicant Canon Co., Ltd.

Claims (1)

[Claims] Measuring means for determining subject brightness vt#l; a plurality of parameter setting means for respectively setting a plurality of exposure parameters; an exposure control means for controlling the amount of light incident on the imaging means by the output of the calculation means; a @1 mode in which the imaging means periodically scans; and a second mode in which the imaging means scans only one frame. scanning control means having a mode of; switching means for selectively switching exposure parameters input to the calculation means; and @1. An imaging device configured to switch parameters selected by the switching means in conjunction with switching of the second mode.