JPS62196639A - Camera including gyro - Google Patents

Abstract

PURPOSE:To improve more surely a hand vibration preventing effect by generating an alarm when the rotational frequency of the gyro does not reach a prescribed value is decided by a deciding circuit and an object has low luminance. CONSTITUTION:When a main switch 10 is turned on, a motor 2 is rotated and the gyro 1 also starts to be rotated. A rotational frequency detecting means 4 detects the rotational frequency of the gyro 1 and the rotational frequency deciding circuit 11 decides whether the rotational frequency of the gyro reaches a prescribed value or not. When a SW 1 is turned on to execute photographing, the luminance of the object is measured by a photometric circuit 13 and an object luminance deciding circuit 14 decides whether the luminance is a low level generating limit shutter speed for preventing the generation of hand vibration in a program shutter or not. When an AND circuit 15 connected to both the deciding circuits 11, 14 decides that the luminance of the subject is low and the rotational frequency of the gyro 1 does not reach the prescribed value, an alarm circuit 16 is turned to alarm that the hand vibration preventing effect is not obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application in Industry] The present invention relates to a camera with a built-in gyro that prevents hand-held shots.

[Prior Art] Conventionally, when taking photographs with a camera having a program shutter, when the subject has low brightness, the shutter speed is set to be slow, which tends to cause camera shake. For this reason, many cameras provide a camera shake warning by flashing an LED in or near the viewfinder to encourage the photographer to use a strobe. However, if the photographer did not notice this camera shake warning display or if the strobe was not charged, he or she would take pictures without using the strobe. To solve these drawbacks, a camera has already been proposed in which a gyro is built into the camera and the centrifugal force generated by the rotation of the gyro is used to prevent camera shake. However, in these cameras, the effect of preventing camera shake cannot be obtained unless the rotational speed of the gyro is quite high, and if a picture is taken before the gyro is rotating at the specified rotational speed, camera shake cannot be prevented. Ta.

[Objective] The present invention solves the above-mentioned conventional drawbacks, and aims to provide a camera with a built-in gyro that has a gyro to prevent camera shake and has a more reliable effect of preventing camera shake. .

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 2, 1 is a disc-shaped gyro, 2 is a motor that rotates the gyro 1, 3 is a connecting member that connects the gyro 1 and the motor 2, and 4 is a distal end of the gyro 1.
The rotation speed detecting means 4 is arranged to face the gyro 1 at a predetermined interval, and the rotation speed detecting means 4 detects the rotation speed of the gyro 1 from a pattern 1a attached to the surface of the gyro 1. For example, a photocoupler is used.

The rotation speed detecting means 4 of the jar 4011 and the like are arranged at the lower part of the camera body 5, as shown in FIG. 6 is a photographing optical axis consisting of a combination of a plurality of lenses, and 7 is a finder optical axis. Furthermore, 8 is a light receiving lens provided on the front side (right side in FIG. 3) of the camera body 5, and 9 is a light receiving element provided behind the light receiving lens.

Next, the present invention will be explained in detail using the block diagram shown in FIG. First, when the main switch 10 is turned on, the motor 2 starts rotating, and the gyro 1 also starts rotating via the connecting member 3. Here, the rotation speed detection means 4 detects the rotation speed of the gyro 1, and the rotation speed determination circuit 11 determines whether the detected rotation speed has reached a predetermined rotation speed. Note that the predetermined number of rotations refers to the number of rotations at which the rotation of the gyro 1 provides an effect of preventing camera shake. On the other hand, when switch 1, which is the first stroke of the shutter button (not shown), is turned on to take a picture, the photometry circuit 13
The brightness of the subject is photometered. Reference numeral 14 denotes a subject brightness determination circuit that determines whether the measured brightness is such a low brightness that the shutter speed is slower than the limit shutter speed that does not cause camera shake in the program shutter. Reference numeral 15 denotes an AND circuit connected to both of the determination circuits 11 and 14, and when it is determined that the subject brightness is low and the rotation speed of the gyro 1 has not reached the predetermined rotation speed as described above, the warning circuit 16 is connected. is turned on to warn the photographer that the rotation speed of Gyro 1 is still low and the camera shake prevention effect cannot be achieved. As an example of such a warning, for example, a well-known method that causes an LED to blink inside the viewfinder can be considered. Then, when a predetermined period of time has elapsed and the rotation speed determination circuit 11 determines that the rotation speed of the gyro 1 has reached the predetermined rotation speed, the warning is canceled even if the subject is of low brightness.

In addition to the above explanation, if it is determined that the rotation speed of the gyro 1 has not reached the predetermined rotation speed and the subject is of low brightness, the release prohibition circuit 17 prohibits the shutter release at the same time as the above-mentioned warning, and the gyro 1 It is also possible to disable photographing until the camera shake prevention effect is obtained, or to forcibly perform strobe i-shading using the strobe photographing mode circuit 18. , and 19 is a switch 2 that is turned on by the second stroke of a shutter button (not shown).

In the above-mentioned embodiments, an LED flashing in the viewfinder was explained as a warning means for the photographer, but the present invention is not limited to this. For example, a display member may be mechanically moved in and out of the viewfinder, The warning may be issued by sound using a sounding body or the like.

[Effects of the Invention] As explained above, according to the camera with a built-in gyro of the present invention, the rotation speed of the gyro is detected, and until the rotation speed reaches a preset rotation speed, the subject is in low brightness. If so, the camera shake prevention effect of the gyro can be improved by issuing a camera shake warning to alert the photographer, or by prohibiting shutter release operation at the same time as the camera shake warning, or by forcing flash photography. It can be made more reliable.

[Brief explanation of drawings]

Figure 1 is a schematic block diagram, Figure 2 is a partial perspective view showing the gyro and its circulation, and Figure 3 is a schematic sectional view of the camera.

Claims (3)

[Claims] (1) A camera equipped with a program shutter and a gyro, including a detection means for detecting the number of rotations of the gyro, and a detection means for detecting whether the number of rotations detected by the detection means has reached a predetermined number of rotations set in advance. A built-in gyro, characterized in that the determination circuit determines that the number of rotations of the gyro has not reached a predetermined number of rotations and issues a warning when the subject is of low brightness. camera. (2) The camera with a built-in gyro according to claim 1, characterized in that, in addition to the warning, the operation of the shutter release is prohibited. (3) In addition to the above-mentioned warning, the mode is automatically switched to a strobe light emission mode.
Camera with built-in gyro as described in section.