JPH0443474B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a power supply switch device for a video camera system or a system comprising a video camera system and a video tape recorder (VTR) system. The present invention relates to a switch device for efficiently supplying power to an electronic viewfinder operating circuit in a video camera equipped with an electronic viewfinder.

<Prior Art> In the case of a conventional video camera equipped with an electronic viewfinder, the switch for the operation circuit of the electronic viewfinder and the switch for the operation circuit of the video camera body are provided separately, but the switch for the operation circuit of the electronic viewfinder is is closed (on) once.
The use of an electronic viewfinder,
It remains closed regardless of whether it is not in use.

<Problems with the prior art> However, needless to say, the electronic viewfinder of a video camera is used to properly compose the subject, and there is no need to use it if there is no change in the composition. However, since the opening and closing of the switch for the operating circuit is left solely to the operator's discretion, there is a risk that the electronic viewfinder may be left in the operating state even when not in use.
Particularly in the case of a portable type, there was a problem in that it was undesirable from the viewpoint of power saving.

<Means for Solving the Problems> In order to solve the problems, the present invention provides a power supply circuit that supplies power, an electronic viewfinder operation circuit that operates an electronic viewfinder for observing a subject image, and an electronic electronic viewfinder switch means that is attached to the viewfinder and opens and closes by elastic deformation of an eyepiece hood formed of an elastic member to control power supply from a power supply circuit to an operating circuit of the electronic viewfinder;
The video camera system operating circuit is configured to include a video camera system operating circuit, and a changeover switch means that is connected in parallel to the electronic viewfinder switch means and can selectively connect the video camera system operating circuit to the electronic viewfinder switch means or the power supply circuit. ing.
Further, the present invention includes a power supply circuit that supplies power;
An electronic viewfinder operating circuit that operates an electronic viewfinder for observing a subject image, and an electronic viewfinder operation circuit that opens and closes based on optical changes in an eyepiece hood that is attached to the electronic viewfinder and is formed of an elastic member and is operated from a power supply circuit. An electronic viewfinder switch means for controlling power supply to the circuit, a video camera system operating circuit, and an electronic viewfinder switch means are connected in parallel to each other, and the video camera system operating circuit is connected to the electronic viewfinder switch means or the power supply circuit. The device is configured to include a selector switch means that can be selectively connected.

<Operation> When the operator's eyes are pressed against or faced against the eyepiece hood during use of the electronic viewfinder, the electronic viewfinder switch means is closed and power is supplied to the operating circuit of the electronic viewfinder. At this time, the operating circuit of the video camera system is operated together with the operating circuit of the electronic viewfinder or separately from the operating circuit of the electronic viewfinder by selective operation of the changeover switch means.

<Embodiment> Fig. 1 shows a case where the present invention is applied to a system each equipped with a video camera system and a video tape recorder (VTR) system. A power supply circuit consisting of a rechargeable battery such as a lead-acid battery. One fixed contact 2a side of a first switch means 2 as a changeover switch means is connected to this power supply circuit 1, and the other fixed contact 2b side of this first switch means 2 is connected to an operating circuit of an electronic viewfinder. 3 is connected.
Furthermore, a video camera system operating circuit 4 and a VTR system operating circuit 5 are connected to the movable contact 2c side of the first switch means 2, respectively.

Further, an electronic viewfinder operating circuit 3 is connected to the power supply circuit 1 via a second switch means 6 as a switch means for the electronic viewfinder, and this switch means 6 can directly control the power supply to the electronic viewfinder. It's becoming like that.

Incidentally, reference numeral 7 denotes a system control circuit mainly composed of a microcomputer to control the entire system.

2 to 4 show a first embodiment of the second switch means, and the electronic viewfinder 8
The eyepiece part 9 is made of an elastic material such as rubber, and has a bellows part 10 that can be expanded and contracted in the direction in which the operator's eye is pressed.
A hood 10 having a shape formed therein is attached, and an actuator 12 of a push switch 11 fixed to the eyepiece portion 9 is attached to the hood 10 so as to be interlocked with the expansion and contraction movement of the bellows portion 10a.

With this structure, when the video camera operator presses his eye E against the hood 10 as shown in FIG. 4, the bellows portion 10a is compressed and actuates the actuator 12 of the push switch 11. This closes the push switch 11. Therefore, the electronic viewfinder, which has been in an inactive state, is brought into an active state by being supplied with power from the power supply circuit 1 to the operating circuit 3.

At this time, if the movable contact 2c is connected to the fixed contact 2a side in the first switch means 2,
Regardless of whether the electronic viewfinder is activated or not, both the video camera system and the VTR system are guaranteed to be operational. Further, when the movable contact 2c is switched to the fixed contact 2b side in the first switch means 2, the video camera system and
The VTR system can maintain its respective operating state only when the electronic viewfinder becomes active.

Next, FIG. 5 shows a second embodiment of the second switch means 6, in which opening and closing of the second switch means 6 is realized by a so-called non-contact method. That is, a photo interrupter P is provided in the hood 10, and the output of the photo interrupter P is inputted to the voltage comparator CP, and the output operates the transistor Tr, thereby energizing the excitation coil CL of the relay to close its contact S. It is designed to close the . That is, when the eye of the operator faces the hood H, the light that hits the eye from the light emitting part of the photo interrupter P is received by the light receiving part, thereby closing the contact S.
Other operational relationships are the same as those in the first embodiment, so their explanation will be omitted.

In the above description, the first switch means 1 is configured to be connected to a video camera system and a VTR system, but a configuration in which only a video camera system is connected may also be used.

<Effects of the Invention> As described above, according to the first invention, there is provided a mechanical electronic viewfinder switch means that is closed when the operator's eye is pressed against the hood of the eyepiece part of the electronic viewfinder. Since the configuration is such that power is supplied to the operating circuit of the electronic viewfinder, the electronic viewfinder can be operated only when necessary, which is expected to save power, and this is particularly effective for portable video cameras. It is. Further, the changeover switch allows power to be supplied to the operating circuit of the video camera system when the operator's eye is pressed against the eyepiece hood, thereby further saving power. Moreover, since a simple configuration can be added to the conventional device, a significant increase in cost can be avoided.

Furthermore, according to the second invention, the electronic viewfinder switch means is provided in the eyepiece portion of the electronic viewfinder for detecting optical changes in the hood and opening and closing the hood in a non-contact manner. It also has the effect of reducing operational complexity since additional pressing operations can be omitted.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a side view of the eyepiece section of the electronic viewfinder,
FIG. 3 is a cross-sectional view of the eyepiece when the push switch as the second switch means is in the open state, FIG. 4 is a cross-sectional view of the eyepiece when the push switch is in the closed state, and FIG. It is a circuit diagram showing an example of. 1...Power supply circuit, 2...First switch means,
3...Electronic viewfinder operating circuit, 4...
Video camera system operating circuit, 6...second switch means.

Claims (1)

[Scope of Claims] 1. A power supply circuit that supplies power; an electronic viewfinder operating circuit that operates an electronic viewfinder for observing a subject image; and an eyepiece hood attached to the electronic viewfinder and formed of an elastic member. an electronic viewfinder switch means that opens and closes by elastic deformation of the electronic viewfinder to control power supply from the power supply circuit to the operation circuit of the electronic viewfinder; connected in parallel to the video camera system operation circuit and the electronic viewfinder switch means; . A switch device for power supply of a video camera, comprising: switch means for the electronic viewfinder or changeover switch means capable of selectively connecting the operating circuit of the video camera system to the power supply circuit. 2. A power supply circuit that supplies power, an electronic viewfinder operating circuit that operates an electronic viewfinder for observing a subject image, and an optical change in an eyepiece hood that is attached to the electronic viewfinder and formed of an elastic member. an electronic viewfinder switch means that opens and closes to control power supply from the power supply circuit to the operation circuit of the electronic viewfinder; a video camera system operation circuit; and an electronic viewfinder switch means connected in parallel to the electronic viewfinder switch means, A switch device for power supply of a video camera, comprising switch means for selectively connecting an operating circuit of the video camera system to the power supply circuit.