JPS59100670A - Image pickup device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an imaging device using imaging means that converts a subject image into an electrical signal, and particularly to a flash.

Regarding an imaging device that can use a flashlight emitting device such as a flashlight,
The flashlight emitting device may be integrated with the imaging device or may be separate.

<Description of the Prior Art> Conventionally, as a means for adjusting the exposure amount in such an imaging device, an auto iris that drives and controls the aperture blades with a servo motor has been used. Therefore, when capturing an image of a fast-moving object, the image may be blurred or blurred. Further, when a charge transfer type image sensor is used as an image pickup means, smear will occur in the vertical direction if strong light hits the device during the transfer period of the L accumulated charges.

<Purpose of the Invention> In view of the above-mentioned drawbacks, the object of the invention is to provide an imaging device that can obtain clear images even for fast-moving subjects, and can also use a flash light emitting device for dark subjects. do.

<Description of Embodiments> FIG. 1 is a transparent perspective view of a still video camera according to an embodiment of the present invention. In the figure, 21 is a photographing lens, 22 is an aperture, 23 is an aperture drive motor, 24 is a p-tally shutter unit, 25 is a shutter blade having an aperture 25a, 26 is a shutter drive motor, and 27 is a COD as an imaging means. , 28 is a magnetic sheet drive unit, 29 is a magnetic sheet,
60 is a magnetic sheet drive motor.

31 is a head unit, 32 is a photodiode for detecting the shutter rotation position, 36 is an electronic circuit section, 64 is a release button, 35 is an accessory shoe for attaching a strobe and flash, and 36 is a transmitter for transmitting a synchronization signal to the strobe or flash. The so-called X contact 67 is a contact that transmits the completion of charging from the strobe etc. side to the camera 2 side.

FIG. 2 shows a control block diagram. In the figure, 1 is a control circuit for the electronic strobe, and 2 is a control circuit for the camera. The control circuit 1 of the strobe includes a power supply 10, a booster circuit 11, a main capacitor for discharging 12, a non-neon tube that indicates charging completion, a transistor 14 that turns on when charging is completed, a trigger circuit 15, and a discharge tube 16.
Consists of.

The control circuit 2 on the camera side includes a circuit 4 that outputs a high level (hereinafter referred to as "H") signal at the release switch, an AND gate 6, a monostable multivibrator 7°9, a signal processing circuit 40 that processes signals of the CGD 27, analog switch 4
1.42, an amplifier 43, and a recording circuit 44 that performs recording on the magnetic cable 29.

Explanation of operation> First, to explain normal photography without using a flash, when the release button 34 is pressed, the first switch of the two-stage switch (not shown) linked to this closes, and the electronic circuit 63 closes.
, the aperture drive motor 26, the shutter drive motor 26, and the magnetic sheet drive motor 30 are supplied with power and become ready for photographing.

In this case, the shutter drive motor 26 is servo-driven at a field frequency of 60H2, and the shutter blade 25 fixed to the shaft of the motor rotates in the direction of the arrow in the figure.

It rotates at 3600 rpm. Phototransistor 5
outputs a signal by being irradiated with imaging light from the shutter opening 25aK. In this embodiment, the phototransistor 5 is irradiated with light immediately after the shutter blade aperture 25a fully opens the light receiving portion of the photoelectric conversion element 27. The phase of the shutter blade 25 is controlled by the output of the phototransistor 5, and synchronized with the operation of the photoelectric conversion element 27. That is, the photoelectric conversion element 27 is exposed to light by the aperture 25a for only a predetermined time within one field period, that is, a charge storage operation period, and is shielded from light while the stored charge is being transferred. In this state, magnetic sheet 2
No recording is made at 9.

When the release button 34 is further pressed, the second stage switch (not shown) is closed, the rHJ signal is output from the circuit 4, the analog switch 42 is closed via the normally closed analog switch 41, and the output video signal of the C0D 27 is output. (magnetic sheet) 29 IC is recorded.

Next, strobe photography will be explained. S) When the o switch is turned on, the main capacitor f2 is charged,
When charging is completed, the neon tube 13 lights up and the transistor 14 turns on.When charging is completed, the normally closed switch 41 is opened via the contact 37, and the signal from the release switch to the analog switch 42 is cut off.Then, the release switch 64 is turned on. When pressed and the second stage switch is closed, the rHJ signal is output from circuit 4,
The signal is input to the monostable multivibrator 9, and the vibrator 9 outputs a signal of rHJ for a predetermined period of time. When light enters the phototransistor 5, the monostable vibrator 7
The output also becomes rHJ, the AND gate 6 opens the gate, and the rHJ signal is input to the trigger circuit 15 via the X contact 66, causing the discharge tube 16 to perform a light emitting operation. Further, the output of the AND gate 6 closes the analog switch 42, and the video signal captured by the C0D 27 when the S/O light is emitted is recorded on the magnetic sheet 29.

In the non-embodiments, a light receiving element was used as a detection means for detecting the rotational position of the shutter blade, but a magnetic sensor such as a Hall element, or a mechanical sensor such as a brush may also be used.

However, if a mechanical detection means is used, the load on the shutter drive motor will fluctuate greatly, so a non-contact means is suitable.

Further, in the non-embodiment, the phototransistor 5 for detecting the shutter rotation position is placed close to the C0D27, but it may be placed at another position to detect the rotation of the shutter blade or the shutter drive motor. It is necessary to correct the difference between the output of the phototransistor 5 and the timing at which the shutter opening 25a completely opens the light receiving section of the C and CD 27.

Furthermore, it is also possible to detect purely electrically by the phase of the rotational drive signal, the number of pulses, etc. when a welfare pulse motor is used.

Further, although a four-tally shutter is used in this embodiment, other mechanical shutters or physical shutters such as liquid crystal shutters may also be used as long as they are continuous shutters that operate in synchronization with the reading cycle of the imaging means.

As explained above, according to the present invention, the exposure time can be made shorter than the 〇 frame period that easily indicates the HX frame, and a clear still image can be obtained. When a charge transfer device is used as a means, it is possible to suppress the occurrence of smear and obtain a high-quality image0.Also, when a shutter that operates continuously in synchronization with the successive cycle is used, the release switch can be used to When a flashlight emitting device emits light, part of the incident light is blocked by the shutter, but according to the invention, it is possible to obtain a uniform image signal on the entire screen without being blocked by the shutter.

[Brief explanation of the drawing]

FIG. 1 is a transparent side view of a still video camera that is not an example.
FIG. 2 is a control circuit diagram of this embodiment. In the figure, 5 is a phototransistor, 6 is an AND gate, 15 is a trigger circuit, 16 is a discharge tube, 24 is a rotary shutter unit, 25ti shutter blade IJ, 25&
2 is an opening, 26 is a shutter drive motor, 27 is a COD, 2
9 is a magnetic sheet, 34 is a release button, 35 is an accessory shoe, 66 Applicant Canon Co., Ltd.

Claims (3)

[Claims] (1) An imaging means that converts a subject image into an electrical signal, a shutter member that opens and closes continuously in synchronization with the reading cycle of the imaging means, a release switch that issues an imaging operation command, and a shutter member that connects the imaging means to the imaging means. and a detection means for detecting that the camera is located at a position where no incident light remains, and outputs a synchronization signal to the flash light emitting device on condition that the release switch is operated and a detection output of the detection means is provided. Characteristic imaging device. (2) The imaging device according to claim 1, wherein a rotary shutter is used as the front E-shutter member. (3) The detection output of the detection means is