JPH0423872B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a video camera that can be used in combination with a portable video tape recorder (VTR) or the like.

Conventional configurations and their problems In recent years, with the spread of portable VTRs, there are many opportunities to take pictures with video cameras, and in particular, there is an increase in the number of outdoor shots using batteries.

A conventional photographing device will be described below with reference to the drawings. FIG. 1 is a diagram showing the main parts of a conventional photographing device. A photographing lens 2 for photographing a subject is fixed to the front of a video camera body 1, and an image taken by the photographing lens 2 is formed on an image pickup tube 3. do. The signal from the image pickup tube 3 is supplied to the signal processing circuit 4, where it can be converted into a predetermined video signal. The signal is supplied to a video output terminal 6 for recording onto a VTR (not shown). Therefore, the user can take a picture while checking the image on the electronic viewfinder 5.

However, in the above configuration,
Since current is constantly supplied to the electronic viewfinder, there is a problem in that the battery life is shortened, especially when a video camera is operated using battery power.

OBJECTS OF THE INVENTION An object of the present invention is to provide a photographing device that can reduce power consumption and extend battery life.

Configuration of the Invention The photographing device of the present invention includes a photographing lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographing lens into an electric signal, and an image is confirmed by the electric signal converted by the photoelectric conversion means. The electronic viewfinder is configured to include an electronic viewfinder and a current control means for intermittent at least part of the current supplied to the electronic viewfinder at a predetermined cycle, thereby reducing power consumption.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a configuration diagram of main parts of a photographing device according to an embodiment of the present invention. In FIG. 2, a photographing lens 12 having an autofocus function for photographing a subject is provided at the front of a video camera body 11, and the image of the subject photographed by the photographing lens 12 is transferred to an imaging tube 13 The image is formed on the image pickup tube 13a. The image pickup tube 13 converts the formed optical image into an electrical signal, which is amplified by the signal processing circuit 14 to a predetermined video signal. The video signal processed by the signal processing circuit 14 is stored in the rear part of the video camera body 11, and is sent to an electronic viewfinder 15 using a small cathode ray tube and a portable video camera.
It is supplied to a video output terminal 17 for connection to a VTR 16. The phosphor of the small cathode ray tube for displaying images of the electronic viewfinder 15 has a slightly longer afterglow time than that of a normal cathode ray tube. The electronic viewfinder 15 is driven by a power battery 19 via a current control circuit 18, and the current control circuit 18 controls the heater section of the small cathode ray tube of the electronic viewfinder 15 according to the oscillation cycle of the oscillation circuit 20. It is configured to intermittent the current supplied to circuits other than the The oscillation circuit 20 is a periodic signal generator for a video camera, and as shown in the output waveform diagram in FIG. 18.
Further, a manual switch 21 is connected to the current control circuit 18, and by switching this switch 21, it is possible to constantly supply current to the electronic viewfinder 15.

The operation of the photographing apparatus of this embodiment configured as described above will be described below. Shooting lens 12
The image of the subject photographed by is converted into a predetermined video signal by an image pickup tube 13 and a signal processing circuit 14, and this image can be confirmed by an electronic viewfinder 15. At this time, the current supplied to the electronic viewfinder 15 is turned on and off by the current control circuit 18 with a waveform as shown in FIG.
The image displayed in 5 is interrupted every 1 field (approximately 1/60 second) of the video signal, but the afterglow time of the phosphor of the small cathode ray tube used in the electronic viewfinder 15 is longer than normal. Because it is long,
No fritzing occurs. Therefore, the power supplied to the electronic viewfinder 15 is reduced to about 1/2, so that power battery consumption can be reduced.

Note that although the above embodiments have been described with reference to the case where the current is intermittent for each field, the current is not limited to one field, and the same effect can be obtained even if the current is interrupted for one frame or any time. It is something.

Effects of the Invention As is clear from the above description, the present invention provides a photographic lens for photographing a subject, a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal, and an electric signal converted by the photoelectric conversion means. It is configured to include an electronic viewfinder that checks images using electrical signals, and a current control means that cuts off at least a portion of the current supplied to the electronic viewfinder at a predetermined cycle, so power consumption can be reduced. , the effect of lengthening the battery life can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of main parts of a conventional photographing apparatus, FIG. 2 is a block diagram of main parts of a photographing apparatus according to an embodiment of the present invention, and FIG. 3 is an output waveform diagram. 12... Photographing lens, 13... Image pickup tube, 15...
...Electronic viewfinder, 18...Current control circuit.

Claims (1)

[Claims] 1: a photographic lens for photographing a subject; a photoelectric conversion means for converting an optical image from the photographic lens into an electrical signal; an electronic view finder for confirming an image using the electric signal converted by the photoelectric conversion means; A photographing device comprising a current control means for intermittent at least part of the current supplied to an electronic viewfinder at a predetermined cycle.