JP3311066B2 - Zoom lens device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens suitable for being combined with a television camera body, and more particularly to an operation piece of a seesaw type controller for performing zooming control by servo-driving a motor for zooming. Hereinafter, the present invention relates to an apparatus having a zoom speed adjustment volume that can vary the zooming speed when the zoom seesaw lever is pressed down to the maximum.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a servo mechanism for performing zooming driving of a television lens. Note that the lens barrel, the lens group, and the like are not directly related to the present invention, and thus are omitted.

Reference numeral 1 denotes a sliding piece connected to a seesaw lever. A seesaw type controller is mounted on a lens barrel. When one side of the operating piece is pushed in, the other side is pushed to the wide side, and when the other side is pushed in, the telephoto side is taken in. It is designed to be zoomed. Reference numeral 2 denotes an amplification circuit, and 3 denotes a zoom motor. The zoom motor rotates forward and backward, and rotates a cam barrel or the like that controls the variator and compensator of the optical system. Reference numeral 4 denotes a zoom speed detection circuit which detects the rotation of the motor 3 and passes through a zoom / speed adjustment volume 5. That is, the zoom speed volume 5 of the lens body is formed in a feedback loop of the three zoom motors and the two zoom servo amplifier circuits.

Reference numeral 10 denotes a demand unit as a block. The demand unit is used to operate the lens away from the lens, and is detachably attached to the lens body. The demand unit 10 is also provided with a seesaw controller 9 and a zoom speed volume.

[0005] Zoom seesaw lever 1 of the lens body
Is pressed, twelve zoom command signals are output and input to this zoom servo amplifier circuit. When the zoom demand of 10 is not connected, the speed of the zoom motor 3 is detected by a zoom speed detector, and a zoom feedback signal 13 corresponding to the speed is output. It is added to the command signal. The signal amplified by the zoom servo amplifier circuit 2 is output to drive the zoom motor 3. At this time, the speed of the zoom motor 3 is determined by the pushing amount of the zoom seesaw lever of one lens body and the value of the zoom speed volume 5 of the lens body.

When the zoom demand 10 is connected and used, the speed of the zoom motor 3 is controlled in the same manner as described above by the pushing amount of the zoom seesaw lever in the demand 9 and the zoom speed volume 8 in the demand. Adjustable. However, since the zoom speed volume 5 of the lens body is provided in the feedback loop of the zoom speed detection circuit of 4 and the zoom servo amplifier circuit of 2, the zoom speed volume 5 of the lens body,
The zoom speed volumes 8 in the demand influence each other.

[0007]

As described above, in the above-mentioned conventional example, since the zoom speed volume 5 of the lens body and the zoom speed volume 8 in the zoom demand interact with each other, each time 10 zoom demands are used. To
Returning to the standard position so that the zoom speed volume 5 of the lens body does not affect, and when using the lens alone, it is necessary to readjust the zoom speed volume 5 of the lens body, and handling is troublesome. Sometimes the volume was returned to the standard position, or it was forgotten to readjust it, which caused confusion during shooting.

[0008]

As described in the embodiments described later , the first embodiment of the present invention comprises a lens
Lens in a zoom lens device with a lens unit
Push the seesaw type zooming controller provided on the main body.
Speed variable circuit to change the zoom speed when
It is provided on the input side of the zoom servo amplifier circuit of the lens body.
It is characterized by that.

A second embodiment of the present invention relates to a lens body and
Zoom lens system with a zoom unit
Demand unit equipped with a speed variable circuit that varies the system speed
When a unit is detected, the speed variable circuit of the lens
It is characterized by being effective. Further, a third embodiment of the present invention
Is a zoom lens with a lens body and a demand unit
The lens body determines the zoom speed in the zoom device
With two speed setting circuits, and two speed setting circuits
It is characterized by comprising switch means for switching. Ma
Also, as a preferred mode, of the two speed setting circuits,
One is a circuit that can vary the zoom speed and speed.
One is a circuit for fixing the zoom speed speed.

[0010]

Embodiments of the present invention will be described below. FIG.
The same reference numerals are given to members equivalent to those of the above.

First, the zoom speed volume 5 of the lens body is connected in series between the zoom seesaw lever 1 and the zoom servo amplifier circuit 2 of the lens body.

When the lens alone is used in the above configuration, when the zoom seesaw lever 1 of the lens body is depressed, a zoom command signal of 12 is output, and the zoom servo amplifier circuit 2 is output via the zoom speed volume 5 of the lens body. Is input to

The speed of the zoom motor 3 is detected by the zoom speed detector 4, a feedback signal 13 corresponding to the speed is output, and the feedback signal 13 is fed back to the input of the zoom servo amplifier circuit 2 via the resistor 6 to provide a predetermined zoom. It is controlled so that speed can be obtained.

When the zoom demand 10 is connected and used, when the zoom seesaw lever 9 in the demand is depressed, a demand zoom command signal 14 is output, and the zoom servo is controlled via the zoom speed volume 8 in the demand. It is input to the amplifier circuit 2, amplified and applied to the zoom motor 3. The speed of the zoom motor 3 is 4
The zoom feedback detector 13 outputs a zoom feedback signal 13 and feeds back to the input of the zoom servo amplifier circuit to control the zoom speed to a predetermined zoom speed given by the zoom demand command signal 14. .

At this time, the zoom speed volume within the zoom demand of 8, which is speed setting means from the zoom demand of 10, and the zoom speed volume 5, which is speed setting means of the lens body, are respectively provided to the input circuit of the zoom servo amplifier circuit. Since the command system is independent, the speed volume within the zoom demand 8 and the zoom speed volume 5 of the lens body do not interfere with each other. Yo
When using the zoom demand, the zoom
Only the speed control will work effectively.
Easy to prepare for shooting, and
The shadows are not confused.

(Other Embodiment) FIG. 2 is a block diagram of a servo mechanism showing another embodiment according to the present invention. In FIG. 2, seven zoom demand detectors are provided as compared with FIG. The output of the zoom feedback signal 13 which is the output of the detector 4 is switched by an 11 demand switch in accordance with the zoom demand attachment / detachment so that the speed volume 8 of the zoom demand and the zoom speed volume 5 of the lens body do not interfere. It is.

The detailed operation will be described below.

First, when the zoom demand 10 is not connected, the demand detector 7 detects no demand, and outputs the zoom feedback signal 13 output from the zoom speed detector 4 by the demand switch 11 to the zoom speed of the lens body. The zoom servo amplifier circuit 2 switches to the volume 5 side and feeds back the zoom speed to the zoom servo amplifier circuit 2. The zoom servo amplifier circuit 2 compares the output of the zoom seesaw lever 1 of the lens body with the returned zoom speed to a predetermined zoom speed. The zoom motor 3 is controlled as follows. Therefore, when there is no demand, the zoom speed is set by the zoom speed volume 5 of the lens body.

However, when a demand is connected, the demand presence state is detected by the demand detector 7 and the 13 feedback switch is switched to the resistor 6 side by the 14 demand switch. As a result, the zoom speed volume of the lens body 5 is opened, and the resistor 6
Is inserted into the return path to block the speed volume of the lens body.

Therefore, the zoom servo amplifying circuit 2 is connected to the zoom seesaw
The output of the lever 9 is commanded via the in-demand zoom speed volume 8, and the zoom feedback signal 13 output from the zoom speed detector 4 is fed back through the resistor 6 via the demand switch 11 to achieve a predetermined zoom speed. The zoom motor 3 is controlled as described above.

As described above, when the demand is connected, the zoom speed volume 5 of the lens body is released from the demand switch 11 to prevent the speed adjustment, and only the zoom speed volume 8 within the zoom demand operates effectively. Therefore, when the zoom demand is detected
You can easily prepare for shooting and forget to readjust
This eliminates the confusion of shooting. Also switch
By providing a demand switch 11 that can be
Zoom speed becomes feasible.

[0022]

According to the present invention described above, the zoom
Zoom lens operability.
It is easier to take a picture using the device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a zoom drive servo circuit showing a first embodiment of the present invention.

FIG. 2 is a block diagram of a zoom drive servo circuit showing a second embodiment of the present invention.

FIG. 3 is a block diagram of an electric system of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 Zoom seesaw lever of lens body 5 Zoom speed volume of lens body 6 Resistor 7 Demand detector 8 Zoom speed volume in demand unit 9 Zoom seesaw lever in demand unit 10 Demand unit 11 Demand switch

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/232 G02B 7/08

Claims (4)

(57) [Claims] In a zoom lens device having a lens body and a demand unit, a zoom speed at a time when a see-saw type zooming controller provided in the lens body is pushed in at a predetermined time is varied. A speed variable circuit for adjusting the speed of the lens body.
A zoom lens device provided on an input side of a zoom servo amplifier circuit . 2. A zoom lens apparatus comprising a lens body and a demand unit , wherein a zoom speed is varied.
The demand unit having the variable speed circuit is detected.
When disabling the speed variable circuit of the lens body
A zoom lens device characterized by the above-mentioned. 3. A camera comprising a lens body and a demand unit.
In a zoom lens device, the lens body is a zoom lens.
And two speed setting circuits for determining the speed mode.
Having a switch means for switching the speed setting circuit.
Characteristic zoom lens device. 4. One of said two speed setting circuits is shifted.
Is a circuit that can change the speed of the
4. A circuit according to claim 3, wherein the circuit speed is fixed.
Zoom lens device.