JPS6221102Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a viewfinder device for a video camera.

Viewfinder devices generally include a prism,
An optical viewfinder device that provides optical information that has passed through a lens to the eye as it is by an optical means formed by combining a plurality of optical members each having at least one reflective surface such as a single-sided reflector or a double-sided reflector; There is a so-called electronic viewfinder device having a receiver, which applies optical information to a photocathode and projects the optical information as an image on the screen of a cathode ray tube through well-known signal processing.

When a video camera is combined with a magnetic recording and reproducing device, a video camera with an optical viewfinder device does not consume power, although it is not possible to check the image at the time of recording. Furthermore, in a video camera equipped with an electronic viewfinder device, it is possible to check images during recording and to check reproduced images by receiving a reproduction signal from a magnetic recording and reproducing device.
However, there is a drawback that power is consumed while the video camera is in use. Therefore, it would be convenient if both of these types of view indexers could be used selectively as needed.

The present invention has been proposed in view of the above, and provides a viewfinder device for a video camera that allows both optical and electronic viewfinder devices to be used as required.

The present invention will be described below with reference to the drawings. FIG. 1 is an optical path diagram showing one embodiment of the present invention.

In the figure, reference numeral 1 denotes a subject, and optical information about the subject 1 is transmitted through a lens 2 and a semi-reflector 3 and is applied to a photocathode 15 of an imaging device 5. Further, a part of the optical information is reflected by the semi-reflecting plate 3 and provided to the reflecting plate 4. The reflector 4 provides optical information to the double-sided reflector 6. Note that this double-sided reflective plate 6 may be a single-sided reflective plate or a prism. Now, the angle of the double-sided reflector 6 can be changed from the outside of the video camera cabinet (not shown), as will be described later, and can be selectively set to the reflection angles A and B shown in the figure. Also, the double-sided reflector 6 is linked to the switching operation of the switch 11, and when the reflection angle A is set, the switch 11 is open and the receiver 8 is turned off, so it is not in operation. do not. At this time, the double-sided reflector gives the above-mentioned optical information to the reflector 7, and the reflected light is transmitted to the eyepiece 9.
is discharged into the finder 11 through. That is,
If the double-sided reflector 6 is set at the reflection angle A, optical information of the subject 1 will appear in the viewfinder 14. Also, when the reflection angle of the double-sided reflector 6 is changed and the double-sided reflector 6 is set to the reflection angle B, the switch 11 is closed and the receiver circuit 10
An alternating current (or direct current) voltage is supplied from the power supply 13 to the receiver 8, and the receiver 8 operates. At this time, the imaging device 5
The optical information on the photocathode 12 is photoelectrically converted and provided to the receiver 8, and the receiver 8 performs predetermined signal processing by the receiver circuit 10 to project an image showing the optical information on the screen. The light from this screen is then given to the reflector plate 7, and the reflected light is reflected through the eyepiece 9.
is discharged into the finder 14 through. That is,
When the double-sided reflector 6 switches to the reflection angle B, the receiver 8 operates, and an image showing optical information of the subject appearing on the screen appears in the viewfinder. Note that 16 indicates the user's eyes.

In this way, the viewfinder device of the present invention is
It has both an optical type and an electronic type. When used as an optical type, the power to the receiver forming the electronic viewfinder device is cut off, and when used as an electronic type, the receiver is connected to the power source. This is effective because it saves power consumption.

In the embodiment, the optical information extracted from the semi-reflecting plate 3 in two directions has been described on the assumption that transmitted light is applied to the photocathode 15 of the imaging device 5, and reflected light is applied to the reflecting plate 4. This relationship may be reversed.

[Brief explanation of drawings]

FIG. 1 is an optical path diagram showing one embodiment of the present invention. 2, 3, 4, 6, 7, 9... optical means, 3...
Semi-reflective member, 5... Imaging device, 6... Selective reflective member, 8... Receiver, 10... Receiver circuit, 11...
...Switch means, 12...Screen, 13...Power supply,
14...Finder, 15...Photocathode.

Claims (1)

[Claims for Utility Model Registration] An optical means that combines a plurality of optical members each having at least one reflective surface, and causes optical information of a subject given through a lens to be reflected multiple times to appear in a viewfinder. A viewfinder device for a video camera, comprising: a semi-reflective member disposed within the optical means, which extracts the applied optical information in one direction and applies it to a photocathode of an imaging device, and at the same time extracts it in the other direction at a different predetermined angle; , a receiver for projecting optical information received by the photocathode onto a predetermined screen via an electrical system; and a receiver disposed within the optical means so that when set to a first reflection angle, the semi-reflective member causing the optical information extracted in the direction to appear in the viewfinder;
a selective reflection member that causes the screen of the receiver to appear in the viewfinder when set to a second reflection angle different from the first reflection angle; and a selective reflection member that is switched in conjunction with the switching operation of the reflection angle of the selective reflection member. , when the selective reflection member is set to the first reflection angle, power supply to the receiver is cut off, and when the selective reflection member is switched and set to the second reflection angle, power is supplied to the receiver. A viewfinder device for a video camera, characterized in that it is equipped with switch means for supplying the video camera.