JPH02238779A - Feeder device for lens for television camera - Google Patents

Abstract

PURPOSE:To prevent useless power consumption by devising the device such that a 1st power supply of a camera and a small drive circuit are conductive when a switch at the camera main body is turned on in the use of the camera and power is supplied from the 1st power supply to the small drive circuit. CONSTITUTION:A switch 2 and a 1st power supply 3 are provided to a TV camera main body 1, and a control section 5, a 2nd power supply 6, a 1st relay switch 7 and a 2nd relay switch 8 are provided to a casing 4 with a TV camera contained thereto. When the switch 2 at the camera main body 1 is turned on in the case of using the camera, power supply is started from the 1st power supply 3 of the camera main body 1 to the small drive circuit 9 at the casing 4 fitted to the lens and the feeding state is detected by a conduction means 5, which is activated and the 2nd power supply 6 at the casing 4 and a servo circuit 10 are conducted to start power supply. Thus, useless power consumption when the device is not in use is avoided.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lens for a television camera that can electrically perform operations such as zooming and focusing, and particularly relates to a lens for a television camera that can electrically perform operations such as zooming and focusing. The present invention relates to a power supply device for a television camera lens that supplies power to each circuit.

[Conventional technology]

In the past, various types of TV cameras have been proposed, such as
A variety of compact and portable lenses for TV cameras have also been developed. By the way, this television camera lens is equipped with various mechanisms, and for example, there are lenses that allow focusing, zooming, etc. to be performed manually. However, it is extremely difficult to perform all of these delicate operations manually at the same time for TV camera lenses, and requires considerable skill and technique, so we decided to make it possible to perform these operations electrically. Things are also being developed. In other words, this type of TV camera is equipped with a dedicated power source on the camera body side, and the power supplied from this battery is used to perform operations such as aperture, focusing, and zooming of the lens attached to the camera body. It is now possible to

By the way, in general, it is important for portable TV cameras to be lightweight so that they are convenient to carry, and for this reason, batteries with a very large capacity are not used. However, when servo drive control is applied on the lens side, there are problems such as the lens not operating properly due to insufficient capacity, or being unable to be used for a relatively long period of time.

Therefore, for example, as shown in FIG.
A model has been developed that not only includes a small-capacity power source 101 on the side, but also includes another power source 104 inside the casing 102 (which may be separate) on the lens side attached to the camera body 100. In other words, power is supplied from the power supply 101 on the camera body 100 side exclusively to the small drive circuit 105 that drives the aperture, extender, etc., which consumes relatively little power, while supplying power to the servo circuit 103 side, which consumes relatively much power. The configuration is such that a relatively large capacity battery is used as a dedicated power source 104. [Problem to be Solved] By the way, TV cameras with such a configuration usually include a switch 1 on the camera body 100 side, for example, as shown in FIG.
06 is provided, and the power supply 101 on the side of the camera body 100 is conveniently configured so that unnecessary power consumption can be prevented by operating the switch 106. on the other hand,
Although there is a switch 106 on the lens side between the power supply 104 and the servo circuit 103, it is often forgotten to turn off and is left on even when not in use, consuming power. This has become a problem as there is a risk of problems such as not working.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, the present invention relates to a power supply device for a television camera lens that prevents power from being wasted when the device is not normally used.

[Problem to be solved]

That is, the present invention has a first power supply on the camera body side that supplies power to a small drive circuit for driving the aperture of the lens, and a second power supply that supplies power to a servo circuit for zooming, focusing, etc. of the lens. In the power supply device for a television camera lens provided on the lens side, conduction means is provided to detect when the small drive circuit is connected to and supplied with the first power supply and to conduct current between the second power supply and the servo circuit. It is something that

[Effect]

In the camera power supply mechanism of the present invention, when the switch on the camera body side is turned on when the camera is used, the first power source and the small drive circuit on the camera side are energized, and power is supplied from the first power source to the small drive circuit. Supplied.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a power supply device for a television camera lens according to the present invention. This power supply device has a switch 2 and a first power source 3 on the TV camera body 1 side, and also
The control unit 5, a second power source 6, a first relay switch 7, and a second relay switch 8 are provided on the side of a casing 4 that houses a camera lens (not shown).

Note that the reference numeral 9 in the figure is a circuit (hereinafter referred to as a small drive circuit) for driving a mechanism such as an iris that requires relatively little power consumption among the drive mechanisms for the lenses, etc. and 10 are circuits (hereinafter referred to as servo circuits) for driving mechanisms such as zooming and focusing on the lens side, and both of these have the same configuration as before. It has become.

In this embodiment, the TV camera main body 1 is lightweight and compact for portable use, and a casing 4 containing a lens is detachably attached thereto.

The switch 2 is attached to the TV camera body 1,
When this TV camera is turned on when using it, not only each circuit in the TV camera body l but also the small drive circuit 9 is turned on from the first power supply 3.
The first power supply 3 is electrically connected to the small drive circuit 9 so that power is supplied from the first power supply 3 to the small drive circuit 9.

This first ffi source 3 is connected to a small drive circuit 9 via a switch 2.
, the control unit 5 and the input sides of the second relay switch 8.

In addition to the various circuits described above, the casing 4 houses various mechanisms for performing predetermined driving operations for the TV camera lens, such as an aperture drive mechanism and a servo mechanism.

The control unit 5 constitutes a part of the conduction means, and when the small drive circuit 9 is brought into conduction with the first power source 3 side and power is supplied from the first power source 3 to the small drive circuit 9, it is electrically connected to the small drive circuit 9. The control signal for operating the first relay switch 7 is output to the first relay switch 7 by detecting the current state. Therefore, the control section 5 has its output side connected to the relay switch 7.8, and its input side connected to the first power source 3 side.

The 21st power source 6 is for supplying power to the servo circuit 10 side, which consumes a relatively large amount of power, and uses a battery with a relatively large capacity compared to the first power source 3. It is connected to the servo circuit 10 side. The second power source 6 is equipped with a display unit using a lamp or the like to display an abnormal condition such as the puff tissue stored in the puff tissue chamber (not shown) inside the casing 4 to the outside. It is connected to 11.

The relay switch 7 constitutes a part of the conduction means,
This is for connecting the second power source 6 and the servo circuit 10 only when the switch 2 is in the on state, and is activated and turned on by a control signal from the control section 5, thereby causing the second power source 6 to be connected to the servo circuit 10. 6 and the servo circuit 10 are electrically connected.

Next, the operation of this embodiment will be explained.

First, when the switch 2 is turned on, a predetermined power is supplied from the first power supply 3 to the small drive circuit 9 via the switch 2. Therefore, when this small drive circuit 9 is operated and, for example, an operation knob for the aperture is operated, the aperture drive mechanism is activated and the aperture can be adjusted freely.

Also, at this time, a predetermined signal (for example, a predetermined voltage) input from the first power source 3 side causes the control section 5 to operate and output a control signal to the relay switch 7, which turns on the relay switch 7. Therefore, the second power supply 6 and the servo circuit 10
becomes conductive, and a predetermined power is applied to the second voltage! 6 is supplied to the servo circuit 10, and this servo circuit 10 operates. Therefore, for example, when operating the zoom control knob,
The servo mechanism operates to perform the desired zooming operation. [Effect] As explained above, according to the power supply device for a television camera lens according to the present invention, when the switch on the camera body side is turned on when using the camera, the lens is powered from the first power supply on the camera body side. Power is started to be supplied to the small drive circuit on the casing side where the lens is attached, and the conduction means detects this power supply state and operates, thereby establishing continuity between the second power supply on the casing side where the lens is attached and the servo circuit side. In other words, it is possible to automatically stop the power supply to the servo circuit, which consumes a relatively large amount of power, when it is not normally used. This can effectively prevent troubles such as when the camera becomes unusable due to a dead battery when used outdoors.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a power supply mechanism for a camera according to the present invention, and FIG. 2 is a block diagram showing a conventional power supply mechanism. 1...Camera body, 9...Small drive circuit, 3...First power supply, lO...Servo circuit, 6...Second power supply, 5... Control unit (conducting means), 7... Relay switch (conducting hand a). .

Claims (1)

[Scope of Claims] 1. A first power supply is provided on the camera body side for supplying power to a small drive circuit for driving a lens aperture, etc., and a second power supply is provided for supplying power to a servo circuit for zooming, focusing, etc. of the lens. A power supply device for a television camera lens having a power supply on the lens side, wherein the small drive circuit includes a conduction means for supplying current between a second power supply and a servo circuit in conjunction with conduction and power supply to the first power supply. A power supply device for television camera lenses featuring: