JPH0374973A - Electronic still camera - Google Patents

Abstract

PURPOSE:To attain proper pickup by detecting the acceleration from the vibration exerted in the inside of a camera at pickup and outputting a recording enable signal or a recording inhibit signal in response to the acceleration. CONSTITUTION:The camera is provided with an acceleration detection means 9 detecting the acceleration due to vibration applied in the inside of a camera 1A at pickup and with a recording enable inhibit discrimination means 10 outputting a recording enable signal when the acceleration is less than a prescribed level based on a detection signal outputted from the acceleration detection means 9 and outputting a recording inhibit signal when the acceleration is a prescribed level or over. Thus, even when vibration due to hand blur at the pickup is exerted in the inside of the camera 1A, the recording enable signal and inhibit signal are outputted and various countermeasures are executed based on the signals. Thus, proper pickup is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electronic still camera that processes image information from a solid-state image sensor and records it on a magneto-optical disk.

<Prior Art> In recent years, electronic still cameras have been commercialized that use solid-state imaging devices such as CCDs, process image information from the solid-state imaging devices, and record the processed image information on recording media such as magnetic disks and semiconductor memories. (See Japanese Patent Application Laid-open No. 194677/1984, etc.).

It is being considered to use magneto-optical disks instead of such conventional recording media such as magnetic disks and semiconductor memories.

This magneto-optical disk is a magnetic storage medium that records with light and reproduces with light. Recording and erasing are performed by irradiating the amorphous magnetic thin film on the disk with a laser beam to locally raise the temperature, and at the same time externally Conversely, readout of stored information is carried out by applying a weak magnetic field to magnetize a local region in the direction of the magnetic field, using the magnetic Kerr effect, which is the interaction between light and magnetism. This magneto-optical disk is characterized by its high density and rewritable nature.

(Problems to be Solved by the Invention) However, electronic still cameras that employ such magneto-optical disks as recording media have the following problems.

That is, if large vibrations due to camera shake or the like are applied to the inside of the camera during photographing, the optical head moves, causing track skipping on the magneto-optical disk, resulting in a problem in that proper photographing cannot be performed.

In particular, in magneto-optical disks, the servo in the track direction is more susceptible to vibration than the servo in the focus direction; for example, the acceleration applied in the track direction is about 5G, while the acceleration applied in the focus direction is as large as 10G.

If the operating direction of the release switch for photographing coincides with the track direction, the influence of the vibrations described above is extremely large, and the above-mentioned problems occur more conspicuously.

Therefore, in view of the above-mentioned conventional problems, the present invention solves the above-mentioned conventional problems by making it possible to take special measures when large vibrations due to camera shake etc. are applied to the inside of the camera during shooting. The purpose is to

Means for Solving the Problems> For this reason, the electronic still camera of the present invention processes image information from a solid-state image sensor and records it on a magneto-optical disk. An acceleration detection means for detecting acceleration, and a recording permission signal is output when the acceleration is less than a predetermined magnitude based on the detection signal output from the acceleration detection means, and a recording prohibition signal is output when the acceleration is more than a predetermined magnitude. The configuration includes a recording permission/prohibition determining means for outputting a recording permission/prohibition determination means.

Effects> In the above configuration, when vibrations caused by camera shake etc. are applied to the inside of the camera during shooting, a recording permission signal and a prohibition signal are output. This makes it possible to take measures to prevent problems, and to perform proper photography.

<Example> Embodiments of the present invention will be described below based on the drawings.

In the figure, a main body IA of an electronic still camera 1 is formed into a horizontally long rectangular shape, and a release switch 2 for shooting
, an optical lens 3, an image sensor (not shown) such as a COD that converts the optical image signal of the object obtained by the optical lens 3 into an electrical image signal, and an image sensor (not shown) such as a COD that converts the electrical image signal into a digital signal by A/D converting the electrical image signal. A/D converter for obtaining image signals (not shown)
and a magneto-optical disk 4 for storing the digital image signal.

The magneto-optical disk 4 is disposed within the electronic still camera main body LA along the longitudinal surface of the main body IA, and is driven (rotated) by a motor 5. A laser beam irradiation section 6a of an optical head 6 that emits a laser beam for recording an image signal on this magneto-optical disk 4 is located opposite to one surface of the magneto-optical disk 4 on an axis perpendicular to the core. It will be opened in A coil 7 for auxiliary magnetic field is provided on the other side of the magneto-optical disk 4.
are arranged facing each other. The optical head 6 is moved by an actuator 8 such as a slider motor in the direction of arrow T in the figure.
The arrow F in the figure indicates the focus direction.

The arrangement positions of the release switch 2 and the magneto-optical disk 4 are set so that the track direction T and the focus direction F of the magneto-optical disk 4 are perpendicular to the operating direction of the release switch 2. The camera is configured to reduce the influence of vibrations caused by camera shake or the like when operating the photographing release switch 2 in both the track direction T and the focus direction F.

Here, an acceleration detection means is provided for detecting acceleration due to vibration caused by camera shake or the like applied to the inside of the camera during photographing. As this acceleration detection means, a well-known vibration sensor 9 using a piezoelectric ceramic plate is applied. The output of the vibration sensor 9 is approximately 0.4 VP-P when an impact acceleration of 40 G (corresponding to dropping an object weighing 3 g from a height of 3 cm) is applied, for example. Since this output cannot be used directly as it is, for example, use an operational amplifier to amplify it, and then input it to a timer IC.
Vibration can be detected by inputting the output from a circuit that obtains pulses of s or more to a microcomputer.

The mounting position and direction of the vibration sensor 9 are set so that the maximum acceleration generated inside the camera body IA can be detected.

Specifically, the vibration sensor 9 is arranged on an extension line of the operating direction of the release switch 2 and relatively close to the magneto-optical disk 4, so that the vibration detection direction and the track direction T coincide.

Based on the detection signal output from the vibration sensor 9 as described above, a recording permission signal is output when the acceleration is less than a predetermined magnitude, and a recording prohibition signal is output when the acceleration is greater than a predetermined magnitude. A prohibition determining means 10 is provided.

Then, the following post-processing means 11 is provided which operates according to the recording permission signal and the recording prohibition signal outputted from the recording permission/prohibition determining means 10.

That is, locking means is provided to enable the operation of the release switch 2 when the recording permission signal is output, and to disable the operation of the release switch 2 when the recording prohibition signal is output.

Alternatively, a means for issuing a warning using a lamp, a buzzer, etc. is provided when the recording prohibition signal is output.

Further, when the recording inhibit signal is output, a control means is provided to return the magneto-optical disk 4 to the initial position and start tracking again.

Note that during special photography such as panning shots, the detection value of the vibration sensor 9 naturally increases, so the vibration sensor 9
The detection level is set to be higher than that for normal shooting.

This is done by providing a mode for normal shooting and a mode for special shooting.

According to this configuration, when large vibrations caused by camera shake etc. are applied to the inside of the camera during shooting, a recording permission signal and a prohibition signal are output, making it possible to take various countermeasures, thereby preventing vibrations from affecting the camera. It is possible to avoid photographing in a state in which the camera is connected, and it becomes possible to perform proper photographing.

In particular, in this embodiment, since the track direction T and the focus direction F of the magneto-optical disk 4 are set to be orthogonal to the operating direction of the release switch 2, the track direction T and the focus direction of the magneto-optical disk 4 are It is possible to reduce the influence of vibrations caused by camera shake or the like when operating the photographing release switch 2 on both F and F.

Furthermore, since the vibration sensor 9 is arranged on the extension line of the operating direction of the release switch 2 and relatively close to the magneto-optical disk 4, and the vibration detection direction and the track direction T are made to coincide with each other, the electronic still camera main body Acceleration applied inside the IA can be effectively detected.

In the above embodiment, the vibration sensor 9 is provided at a single location to detect vibrations in one direction, but the vibration sensor 9 may be provided at multiple locations to detect vibrations in various directions.

<Effects of the Invention> As explained above, according to the electronic still camera of the present invention, an acceleration detection means is provided for detecting acceleration due to vibrations applied to the inside of the camera during shooting, and a recording permission signal or a recording prohibition signal is generated according to this acceleration. By outputting , it is possible to avoid photographing with vibrations applied to the inside of the camera, and it is highly useful in allowing proper photographing.

[Brief explanation of drawings]

The figure is a schematic perspective view showing an embodiment of an electronic still camera according to the present invention. 1...Electronic still camera IA...Body 4.
・・Magneto-optical disk 9・Vibration sensor 10・
・Recording permission/prohibition determination means

Claims (1)

[Claims] In an electronic still camera that processes image information from a solid-state image sensor and records it on a magneto-optical disk, there is provided an acceleration detection means for detecting acceleration due to vibrations applied inside the camera during shooting, and a detection signal output from the acceleration detection means. 1. An electronic still comprising recording permission/prohibition determining means for outputting a recording permission signal when the acceleration is less than a predetermined magnitude and outputting a recording prohibition signal when the acceleration is greater than or equal to a predetermined magnitude. camera.