JPS628622Y2 - - Google Patents

Description

[Detailed explanation of the invention] When recording using a handy type video camera, driving power is supplied to the video camera from a recording device such as a portable VTR, so in conventional models, the video camera is connected to the VTR. When connected, power is immediately supplied to the video camera and the electronic viewfinder (EVF), and the subject is displayed on the viewfinder.

Therefore, when a person who is not familiar with camera operations uses this video camera device, when a subject is displayed on the viewfinder, the VCR may be under the illusion that it is also in standby mode.
Even when the cassette is not loaded,
When you start operating the camera, you may end up making an unexpected mistake.

For this reason, conventionally, a tally indicator lamp is attached to the viewfinder to indicate that the VTR is in standby mode, but when a subject is reflected in the viewfinder, attention is inevitably drawn to the subject, and the tally display is sometimes required. It is often not fully functional.

Therefore, in this invention, at least the viewfinder does not operate until the VTR is in standby mode. An example of this invention will be described in detail below with reference to the drawings.

In Figure 1, 10 is a portable VTR, 2
0 is a small video camera, and the VTR 10 is provided with an external connection terminal 11. 11a is a power supply terminal for the video camera 20, in this example VTR1
This shows a case where voltage is constantly applied regardless of whether the power switch 0 is on or off. 11b is
11c is an input terminal for the video signal to be recorded from the video camera 20;
d is an output terminal for the playback video signal, which is used for playback monitoring. Also, 11e is the video camera 2
This is a control terminal for starting and stopping the VTR 10 on the 0 side. There are several other connection terminals, but they will be omitted. 30
shows these connecting cables.

On the other hand, in the video camera 20, 21 is a power supply circuit provided in the video camera body 25, and 22 is a power supply circuit for the electronic viewfinder 23. These power supply circuits 21 and 22 have a VTR 10
Power is supplied from the side through the cable line 31a. Along the way, in this example, a switching circuit 40 for the power source is provided on the side of the camera body 25, and a control circuit 41 thereof is provided.
A switching pulse CP is formed based on the control signal CS obtained at point b.

As mentioned above, the control signal CS is a signal indicating the standby state of the VTR 10, and in this example,
This is assumed to be obtained when the power switch of the VTR 10 is turned on, a cassette is loaded, and the recording pause state is established.

Note that, depending on the model, loading is completed when the cassette is inserted, and there are also models where the tape is loaded only after operating the record button, but this idea applies to both types. Can be applied.

When the control signal CS is output, a switching pulse CP is generated based on the control signal CS, thereby turning on the switching circuit 40. Therefore, unless the standby state is entered, simply connecting the cable 30 will not supply power to the viewfinder 23 and the subject will not be displayed. Since the viewfinder 23 does not operate until the standby state is entered, there is no need to operate the camera before the standby state is entered.

In this way, according to the configuration of this invention, VTR
Since the power is not supplied to the viewfinder 23 unless the camera 10 enters the standby state, it is possible to surely avoid a mistake in which the camera is operated before the standby state and the desired scene cannot be recorded at all.

Incidentally, in the embodiment shown in FIG. 1, power is supplied to each of the power supply circuits 21 and 22 through the switching circuit 40, but as shown in FIG.
It is also possible to control the switching of only the power to the viewfinder 23 and directly supply the power to the camera body 25 without going through the switching circuit 40.

In this way, it is possible to significantly reduce power consumption. In other words, of the power consumed by a video camera, the power consumed by the viewfinder 23 is approximately half of the total power, so at least VTR10
This has a great effect because it reduces power consumption until it goes into standby. However, the power saving effect is smaller than in the case of FIG.

In the above example, the power switch is VTR10.
However, the present invention can also be applied to a case where a power switch is provided on the video camera 20 side and power is supplied from the video camera 20 side to the VTR 10 side. In this case as well, VTR1
The switching circuit 40 is controlled by the control signal CS from the 0 side, and even if the power switch is turned on,
When the VTR 10 is not in standby mode, power is not supplied to the camera body and viewfinder.

Further, in each of the above embodiments, the switching circuit 40 and the control circuit 41 are provided on the camera body 25 side, but they may be provided on the VTR 10 side.

The control signal CS may be obtained when the power is on and the cassette is in.

[Brief explanation of the drawing]

FIGS. 1 and 2 are system diagrams showing an example of this invention. 10 is a VTR, 50 is a recording device, 20 is a video camera, 25 is a camera body, 23 is a viewfinder, 21 and 22 are power supply circuits, 40 is a switching circuit, and 41 is a control circuit.

Claims (1)

[Scope of utility model registration request] In a video camera device consisting of a video camera and a recording device, a power supply circuit for the electronic viewfinder provided in the video camera is provided with a switching circuit for the power supply, and this switching circuit is activated only when the recording device is in a standby state. A video camera device in which driving power is supplied to the power supply circuit by turning on the power supply circuit.