JPS61239781A - Shutter control method for electronic camera - Google Patents

Abstract

PURPOSE:To minimize the record timing from release button, by making the initialization of image pickup element and opening/closing of shutter according to the release signal, and recording the synchronization of photo-electric information on recording device by record synchronizing means after the shutter is closed. CONSTITUTION:According to ON action to actuate release switch 19, a release control circuit sequentially issues diaphragm command, mirror-up command, and shutter open/close command. By these commands, diaphragm control circuit 20 automatically adjust the extent of diaphragm 2, mirror control circuit 21 push up QR mirror 3, and shutter control circuit 22 opens and closes the shutter 23. And after the shutter is closed, a sensor drive signal is outputted by the transfer pulse of control circuit 13 from timing generating circuit 14 to pickup element 15, and the picture signal is synchronously recorded on rotating magnetic disc 10 through signal processing circuit 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a shutter control system for an electronic camera that allows still images to be recorded on a magnetic recording medium.

[Prior Art 1] An electronic camera (electronic still camera) has been proposed that records still images by performing synchronous recording on a small magnetic disk. Until now, various methods have been proposed as shutter control methods for this type of electronic camera, but in these conventional methods, in order to record images, recording is started in synchronization with the magnetic disk. Ta. Therefore, the time from the trigger signal of the release button to the actual accumulation of images is not constant because it is affected by the recording start time quantized by the rotation period of the magnetic disk. For example, the time lag is 1/80 seconds (33 mg). This has been a problem in photography where the timing of photography is important, such as sports photography and news photography.

Further, even in the case of outdoor animal photography using infrared light, such as automatic photography, there is a problem in that the time lag during release varies as described above, resulting in unsatisfactory photographs.

[Objective] It is an object of the present invention to provide an easy-to-use electronic camera shutter control system that eliminates the above-mentioned drawbacks and minimizes the recording timing from the release button.

In order to achieve this object, the present invention provides an electronic camera that synchronously records still images on a rotating recording medium, which initializes an image sensor and opens and closes a shutter in accordance with a release signal, and after closing the shutter. is characterized in that photoelectric information of an image sensor is synchronously recorded on a recording medium by a recording synchronization means.

[Examples] Examples of the present invention will be described below with reference to the drawings;
Ru.

FIG. 1 shows the overall basic configuration of an embodiment of the present invention.

Here, a is a control means, b is an image sensor, C is a shutter,
d is a recording synchronization means, and e is a recording body. The control means a initializes the image pickup device and opens and closes the shutter C according to the release signal. After the shutter C is closed, the recording synchronization means d is used to synchronously record photoelectric information on the image pickup device. This is done for the recording body e.

FIG. 2 shows an example of the circuit configuration of an electronic camera embodying the present invention. In FIG. 2, 1 to 6 are optical systems. Before and after shooting, the light that passes through the lens group 1 and the aperture 2 passes through the QR mirror (quick return mirror) 3, forms an image on the focus screen (bin plate) 4, and the optical image is transmitted to the pentaprism 5 and the eyepiece lens 6. can be observed through On the other hand, during shooting, the QR mirror 3 rotates around the fulcrum and rises upward on the optical path due to the mirror up/down control using quick return, which will be described later. The light passes directly to the image sensor and is received.

7-10 is a drive system. When shooting, press the power switch
When turned on (opened), the power supply servo control circuit 8 is operated to start the motor 9, thereby steadily rotating the magnetic disk 10, which is a recording medium, and preparing for magnetic recording. (Rotation angle) control is performed by the output pulse of the motor 9 and the PG pulse from the PC coil 11 amplified by the amplifier 12.

13 to 18 are recording systems. A senna drive signal is output from the timing generation circuit 14 to the image sensor (light receiving element such as CCN) 15 in response to a transfer pulse from the release control circuit 13, and an image signal received by the image sensor 15 and photoelectrically converted is transmitted to the signal processing circuit. 1B and the magnetic disk being rotated by the magnetic recording head 18 via the recording amplifier circuit 17! recorded on 0.

19 to 24 are imaging control systems. 19 is a release switch for instructing the above-mentioned release control circuit 13 to shoot;
0 is an aperture control circuit that drives and controls the aperture 2; 21
22 is a mirror control circuit that drives and controls the QR mirror 3; 22 is a shutter 23 disposed in front of the image sensor 15;
a shutter control circuit for driving and controlling the 24
is an exposure control circuit that controls exposure based on the photometric amount of the photometric element 25 provided in the pentaprism 5. Exposure control circuit 2
4 outputs the aperture value to the aperture control circuit 20 and outputs a TV signal to the release control circuit 13. The release control circuit 13 outputs an aperture command to the aperture control circuit 20 based on this TV signal.

An aperture command is issued from the release control circuit 13 in response to the ON operation of the release switch 19 instructing photography.

Mirror map commands and shutter open/close commands are output in sequence. Aperture control circuit 2 by aperture command
0 is activated to automatically adjust the aperture amount of the aperture 2, the mirror control circuit 21 is activated by the mirror up command to flip the QR mirror 3 towards the optical path for a certain period of time, and the shutter 23 is opened and closed by the shutter and ivy commands. The shutter control circuit 22 projects an optical image onto the image sensor 15 at a timing suitable for projection, and records the image in alignment with the index (rotational position) of the magnetic disk. 3 shows a detailed circuit configuration example of the release control circuit 13 shown in FIG. 2, and FIG. 4 is a timing chart showing its operation. The operation of the embodiment will be explained.

When the magnetic disk IO reaches a predetermined rotation speed and is ready for magnetic recording, a high-level ready signal (hereinafter referred to as "ready signal" below) is sent from the power supply servo control circuit 8 through the input line 51.

REAOY signal). After that, release switch 1 when shooting! When J is turned on, the line 54 pulled up by the resistor 53 is brought low.
) to generate a trigger signal, and by inverting the inverter 55 in the next stage, the AND gate 5B is set to high (old gh) and D
- Set the FF (D type slip 7 o 7 slip) 57. With this set, the output line 58 of the D-FF 57 is set high, and the aperture command is output from the output terminal 48 and the mirror-up command for the QR mirror is output from the output terminal 50 as the signal Q1 indicating that shooting is in progress.
Raise the mirror of R mirror 3.

At the same time, a time lag is created in the output Q2 of the output line eO by the mono multi vibrator (hereinafter referred to as mono multi) 58 using the high output of the anti-game) 5B, and the inverter e
Clock D-FF1112 through t.

A signal for instructing the shirt shutter to open is outputted to the output line 83. This opens the shutter 23.

At the same time, output Q2 is connected to inverter 84 and diode B.
5 to the line 8B by the CR circuit 88.87.
The exposure control circuit (AE circuit) shown in Fig. 2 is created.
24. Alternatively, the comparator 70 compares the level signal (TV signal) on the input line 89 from the manual shutter speed setting system (not shown) with the above-mentioned integral value, and when the integral value exceeds the level signal, the output line 72 After instructing to close the shutter shutter, a shutter signal is output, thereby closing the shutter 23.

On the other hand, the initialization of the image sensor 15 will be described.

During non-photography, the output of the inverter 74, which is the low level of the output Q1 of the output signal 58 of the D-FF 57, is inverted, so the vertical synchronization signal (V
D pulse), a transfer pulse is output from the output line 7B to the timing generation circuit 14 through the AND gate 75 as the output of the OR gate 7B, and thereby the CCD image sensor 1
Make 7 re-runs of 5.

Since the release is asynchronous and reception is applied, in response to the drop in the level of the output Q2 of the output 180 of the mono multi 59 in the previous stage, the mono multi 78 in the rear stage creates a pulse Q3 on its output line 78, and in response to the drop in the level of the pulse Q3. Furthermore, a pulse Q4 is generated by the monomulti 81 in the subsequent stage, and this output pulse Q4 is passed through the OR gate 7B to the output &Ia 77, thereby giving a transfer pulse to the CCD image sensor 15 via the timing generation circuit 14 before photographing. The image sensor 15 is cleared.

When the above-described sensor clearing process is completed, the DoFF 83 is clocked with the output obtained by inverting the output Q3 of the output line 78 of the monomulti 78 by the inverter 82, and outputs a high-level output Q5 to the output line 84.

After that, at the end of the shooting, the monomulti 85 is activated by a back-opening signal (shirt-taper closing signal) output from the output line 72, and a time lag for closing the shirt-taper is created on the output line 86.
This time lag signal is passed through the inverter 87 to the D fist F.
It is outputted to F88 to clock D-FF88, and outputted to its output line 89 as a recordable signal Q7. Signal Q5 of line 84 indicating the above-mentioned sensor clearing process before photographing and line 8
9 and recordable signal Q7 by ant game) 8G, and outputs it to the gate output line 81 as a determined recordable signal (gate signal).

Upon receiving the above-mentioned recordable signal on the signal line 81, in synchronization with the disk index signal (PC pulse signal) input from the input line 82, the DΦFF 93 outputs an RtC pulse signal of record+1 recording command to its output line 94.

During image recording, the REC pulse signal on the output line 94 and the vertical synchronizing signal (VD pulse signal) from the input 1173 are ANDed by the AND gate 95, and the result is output to the output line 77 through the OR gate 7B. , instructs the CCD image sensor 15 to transfer and output the recorded information. As a result, the image signal of the image sensor 15 is transmitted to the signal processing circuit 1B,
The data is transferred to the head 18 via the recording amplification circuit 17 and recorded on the track of the magnetic disk 10 that is rotating once.

In order to preserve the information on waiting for synchronization of such a vertical periodic signal, in this example, the output line 8! of the monomulti 80 is used. output Q4
The output 8 is set by D-FF9B.
The AH (anti-blooming) control signal is output to 87, and the transfer command from AND gate 95 is inverted by inverter 9B, and the D-FF 96 is clocked, thereby resetting unnecessary ^B control signals during transfer. do.

Furthermore, the above-mentioned REC pulse signal output to the output line 84 is inverted by the inverter 88-2, and the output is used to reset both D@FF 57 and 83.88 for the next photographing.

Through the series of processes described above, the shutter 23 is opened as shown in the waveform 98 as shown in FIG. index)
An image signal is written on the magnetic disk 10 during a period j indicated by reference numeral 101 in synchronization with the above.

In this way, an easy-to-use magnetic recording electronic camera that prioritizes the photographing timing by switching the timing of the transfer pulse in accordance with the release signal can be easily realized without deteriorating the image quality by controlling the AH control signal.

In the above-described embodiment, the timing was generated by hard logic, but it goes without saying that this timing can be similarly realized by sequence control by software.

[Effects] As explained above, according to the present invention, it is possible to minimize the recording timing from the release button and to record a still image in correct synchronization on the magnetic disk, which in turn makes it possible to record still images on the image pickup device. It is possible to minimize the unnecessary charge of

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a circuit configuration of an embodiment of the present invention, and FIG. 3 is a block diagram showing an example of the configuration of the release control circuit in FIG. 2. circuit diagram. Figure wS4 is a timing chart showing an example of the operation. l...Lens, 2...Aperture, 3...QR mirror, 8...Power servo control circuit. 9...Motor, lO...Magnetic disk. 11... PC coil, 13... Release control circuit, 14... Timing generation circuit 1. 15... Image sensor, 1st... Recording head, 19... Release, 20... Aperture control circuit, 2! ...Mirror control circuit. 22...Shutter control circuit, 57.82,7
1,83.88,93.98...D-FF. 59.78, 80.85...Mono multi.

Claims (1)

[Claims] 1) In an electronic camera that performs synchronous recording of still images on a rotating recording medium, the image sensor is initialized and the shutter is opened and closed in accordance with a release signal, and after the shutter is closed, a recording synchronization means is used. A shutter control method for an electronic camera, characterized in that photoelectric information of the image sensor is synchronously recorded on the recording medium. 2) Shutter control of an electronic camera in the method according to claim 1, characterized in that anti-blooming control of the image sensor is performed only during the period from initialization of the image sensor to the synchronous recording. method.