JP2000059660A - Television lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television lens device capable of stabilizing the lens operation by preventing the trouble of a noise from a cable connecting the main body of lens device and a lens manipulator by performing transmission/ reception of signals through optical signals between the main body of lens device and the lens manipulator for performing various operation of the lens device. SOLUTION: The operation of the operating part of a lens manipulator 40 is detected by a potentiometer 42 and the detected signal is converted to an optical signal by a LED 46 and transmitted through an optical fiber to a main body 12 of lens device. The optical signal transmitted to the main body 12 of lens device is converted to an electric signal by a phototransistor 48 and inputted later to a lens drive circuit 54 as a control signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television lens device, and more particularly, to a zoom lens mounted on a lens device body.
The present invention relates to a television lens device that operates a focus lens or the like by a lens operation device such as a zoom rate demand or a focus demand.

[0002]

2. Description of the Related Art The operation of a zoom lens and a focus lens of a television lens device used for a television camera is operated by a lens operation device such as a zoom rate demand and a focus demand. Conventionally,
The lens device main body equipped with a zoom lens and a focus lens, and a lens operation device such as a zoom rate demand and a focus demand are electrically connected via a cable, and when a photographer operates an operation unit of the lens operation device, Electric signal (control signal) according to the operation
Is transmitted from the lens operating device to the lens device body via a cable. Then, the lens device main body drives the zoom lens and the focus lens based on the control signal transmitted from the lens operation device.

[0003]

However, in the conventional television lens device, since the lens device main body and the lens operating device are electrically connected via the cable as described above, noise easily enters from the cable. In some cases, lens operation becomes unstable due to the influence of noise. Even if noise measures are taken for each of the lens device body and the lens operation device, it is difficult to completely block noise entering from the cable.

The present invention has been made in view of such circumstances, and prevents a problem that noise enters from a cable connecting a lens device main body and a lens operation device.
It is an object of the present invention to provide a television lens device for stabilizing a lens operation.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a lens device main body for mounting a movable photographing lens, driving the photographing lens, and operating the photographing lens based on an operation of an operation section. A lens operating device for transmitting an instruction signal for driving the lens device main body to the lens device main body, wherein a transmitting means provided in the lens operating device, wherein the instruction signal for driving the photographing lens is transmitted by an optical signal. Transmitting means for transmitting to the lens device body;
Receiving means provided in the lens device body, receiving means for receiving an instruction signal transmitted from the lens operating device by an optical signal transmitted from the transmitting means,
It is characterized by having.

According to the present invention, transmission and reception of signals between the lens device main body and the lens operating device are performed not by electric signals but by optical signals, so that the lens device main body and the lens operating device are electrically connected. It is electrically insulated, and the problem that noise enters in the cable connecting them as in the related art is eliminated, and the lens operation can be stabilized.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a television lens device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing one embodiment of a television camera device to which the television lens device according to the present invention is applied. As shown in FIG. 1, the television camera device 10 includes a lens device main body 12 and a camera device 14, and is supported by a camera platform 18 on a pedestal dolly 16. Two operation rods 22 and 23 extend from the camera platform 18, and the operation rod 2
In the vicinity of the second grip 24, a zoom rate demand 26 for operating a zoom speed is attached. On the other hand, a focus demand 28 for operating a focus is attached to an end of the operation rod 23.

The zoom rate demand 26 outputs a speed control signal for zooming to the wide-angle side or the telephoto side to the lens device body 12 via the cable 30 according to the rotation direction and the rotation amount of the thumb ring 34. Lens device body 12
Drives the zoom lens by controlling the speed based on the speed control signal. On the other hand, the focus demand 28
Is the focus ring 28A of the focus demand 28
A position control signal for commanding the movement position of the focus lens according to the amount of rotation operation of the lens unit is output to the lens device main body 12 via the cable 31. The lens device main body 12 moves the focus lens to a commanded position based on the position control signal.

The photographer adjusts the focus by rotating the focus ring 28A of the focus demand 28 with the right hand while watching the photographed image reflected on the viewfinder 32, and operates the thumb ring 34 of the zoom rate demand 26 with the left hand. Can be used to adjust the zoom. Next, a transmission / reception circuit of a signal exchanged between the lens device main body 12 and the lens operation device (the zoom rate demand 26 or the focus demand 28) will be described with reference to FIG. As shown in FIG. 2, the lens operation device 40 is provided with a potentiometer 42 for detecting an operation of the operation unit, and the potentiometer 42 outputs a detection signal of a voltage corresponding to the operation amount.
When the lens operating device 40 is the zoom rate demand 26, the potentiometer 42 is a potentiometer for detecting the rotation operation amount of the thumb ring 34. When the lens operating device 40 is the focus demand 28, the potentiometer 42 This is a potentiometer that detects the amount of rotation of the ring 28A.

[0010] The detection signal output from the potentiometer 42 is then input to a transmission circuit 44, which converts the detection signal into a predetermined transmission signal waveform.
It is output as an optical signal from 46. And the LED 46
The optical signal output from the optical fiber cable (Fig. 1
Are transmitted to the lens device main body 12 via the cable 30 or the cable 31) shown in FIG. It should be noted that an optical signal is transmitted wirelessly by infrared rays or the like without using an optical fiber.
2 may be transmitted.

The lens device body 12 receives the optical signal transmitted from the lens device body 12 by the phototransistor 48 as described above, and converts the optical signal into an electric signal by the phototransistor 48. The signal thus obtained is amplified by the amplifier 50 and then input to the receiving circuit 52. Then, the signal input to the receiving circuit 52 is converted into a control signal for driving the lens, and is input to the lens driving circuit 54. The lens drive circuit 54 drives the zoom lens or the focus lens based on the control signal transmitted from the lens operation device 40 in this manner.

As described above, by transmitting and receiving signals between the lens device main body 12 and the lens operating device 40 by optical signals, the lens device main body 12 and the lens operating device 4 are transmitted and received.
0 can be electrically insulated from each other, so that transmission of noise between these devices can be prevented, and intrusion of noise into a cable connecting these devices can be prevented.

Next, the power supply of the lens operating device (zoom rate demand 26 or focus demand 28) will be described. When the lens device body 12 and the lens operation device 40 are electrically insulated as described above, the lens operation device 4
The power source 0 can be secured by mounting a power source such as a dry battery or a rechargeable battery (secondary battery) in the lens operation device 40. In this case, since not only the signal line but also the power supply line is completely insulated between the lens device main body 12 and the lens operation device 40, noise entering from the power supply line can be completely prevented.

For example, as shown in FIG. 3, a power supply line between the lens device main body 12 and the lens operating device 40 is connected to a transformer 62 at a connector 60 of a cable connecting the lens device main body 12 and the lens operating device 40. In this case, power can be supplied from the power supply 64 of the lens device main body 12 to the lens operation device 40 by electromagnetic induction. In this case, the power supplied from the lens device main body 12 may be directly used as the drive power of the lens operation device 40 (a voltage conversion circuit, a rectification circuit, and the like are provided as appropriate), or as shown in FIG. The rectifier 65 and the smoothing circuit 66 rectify and smooth the AC voltage supplied from the power supply 64 of the lens device body 12 to the lens operation device 40 via the transformer 62, and charge the secondary battery 68 with the power by the charging circuit 67. Rechargeable battery 68
The power of the lens operating device 40 may be supplied from the camera (ie, the power source 64 of the lens device main body 12 is used as a power source for charging).

The transformer 62 of the connector section 60
As shown in FIG. 4, the coil L1 on the lens device main body 12 side and the coil L2 on the lens operation device 40 side are respectively connected to the lens operation device 40 (zoom rate demand 26) as shown in FIG.
Alternatively, the focus demand 28) may be wound around the distal end of the operating rod 22 or the operating rod 23 (see FIG. 1) to be mounted, and the mounting portion 40A of the lens operating device 40 which is fitted outside the distal end and mounted on the operating rod. It may be. The power supplied from the power supply 64 of the lens device main body 12 is transmitted to the lens operation device 40 by the transformer 62 having the same configuration as in FIG.
The secondary battery 68 is charged via the smoothing circuit 66 and the charging circuit 67. The zoom rate demand 26
It is not necessary to supply power directly from the lens device body 12 to each of the focus demand 28 and the focus demand 28. For example, the power supplied to the zoom rate demand 26 may be supplied to the focus demand via a cable as shown in FIG. Good.

As described above, even when power is supplied from the lens device main body 12 to the lens operating device 40, power is supplied through the transformer 62, thereby electrically connecting the lens device main body 12 and the lens operating device 40. As described above, noise can be prevented from being transmitted between the lens device main body 12 and the lens operation device 40. In addition, other than the configuration in which power is supplied from the lens device main body 12 to the lens operation device 40 by electromagnetic induction as described above, the same effects as described above can be obtained as long as power is supplied in a non-contact manner.

As another form of the power supply of the lens operation device 40, a solar cell can be used. In this case, a solar cell may be used directly as a drive power supply, or may be used as a power supply for charging a secondary battery mounted on the lens operation device 40 as described above. As described above, the zoom rate demand 26 and the focus demand 28 have been exemplified as specific devices of the lens operation device 40 in the above-described embodiment. The present invention can be applied.

[0018]

As described above, according to the present invention, the transmission and reception of signals between the lens device main body and the lens operating device are performed not by electric signals but by optical signals. The lens operating device is electrically insulated from the lens operating device, eliminating the problem of noise entering the cable connecting them as in the related art, and stabilizing the lens operation.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a television camera device to which a television lens device according to the present invention is applied.

FIG. 2 is a configuration diagram illustrating a circuit for transmitting and receiving signals exchanged between a lens device main body and a lens operation device.

FIG. 3 is a diagram illustrating a configuration of a power supply line between a lens device main body and a lens operation device.

FIG. 4 is a diagram illustrating a configuration of a power supply line between a lens device main body and a lens operation device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Television camera apparatus 12 ... Lens apparatus main body 14 ... Camera apparatus 26 ... Zoom rate demand 28 ... Focus demand 28A ... Focus ring 40 ... Lens operating device 44 ... Transmission circuit 46 ... LED 48 ... Phototransistor 52 ... Receiving circuit

Claims (3)

[Claims] 1. A lens device main body for mounting a movable photographing lens and driving the photographing lens, and a lens operation for transmitting an instruction signal for driving the photographing lens to the lens device main body based on an operation of an operation unit. A television lens device comprising: a transmission device provided in the lens operation device, wherein the transmission device transmits an instruction signal for driving the photographing lens to the lens device main body by an optical signal; A television lens device, comprising: receiving means provided; and receiving means for receiving an instruction signal transmitted from the lens operating device by an optical signal transmitted from the transmitting means. 2. The television lens device according to claim 1, wherein a power supply of the lens operation device is mounted on the lens operation device. 3. The television lens device according to claim 1, wherein power for the lens operation device is supplied from the lens device main body via a transformer.