JPH0996750A - Tracking mechanism for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tracking mechanism by which adjustment amount is linearly changed without using an eccentric pin. SOLUTION: The lens supporting frame 46 of a master lens group 32 is connected to a linking member 50 through the pin 51. The tapered surface 50A of the member 50 is brought into contact with the tapered surface 64A of a movable member 64, and the member 50 is pressed toward the surface 64A of the member 64 by a spring 58. An adjusting screw 60 is provided on the member 64, and the member 64 moves in a direction crossing at a right angle with an optical axis in the case the screw 60 turns. When the member 64 moves in a direction crossing at a right angle with the optical axis, the member 50 moves back and forth along the optical axis by the operation of the surfaces 64A and 50A; therefore, the frame 46 moves in a back-and-forth direction along the optical axis. A moderation mechanism constituted of a V-groove knurled part 66 and a click ball is provided on the screw 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tracking mechanism for a camera, and more particularly to a tracking mechanism for a camera that facilitates flange back adjustment of the camera.

[0002]

2. Description of the Related Art The flange back adjustment of a TV camera is
Correctly set the distance from the flange surface of the lens mount to the focal plane (CCD) while moving the master lens group located at the rear end in the lens barrel back and forth. That is, as shown in FIG. 4, the master lens group 12 is disposed in the rear part of the lens barrel 10 so as to be slidable in the front-rear direction along the optical axis via the lens support frame 14. Groove 1 of lens support frame 14
The eccentric portion 20 of the eccentric pin 18 is fitted in the reference numeral 6, and a flat head screwdriver or the like is inserted into the groove 18A of the eccentric pin 18 as shown in FIG.
2 is moved back and forth along the optical axis for adjustment.

[0003]

However, in the conventional tracking mechanism described above, since the eccentric pin 18 is rotated to linearly move the master lens group 12, the eccentric pin 1
The amount of linear movement of the master lens group 12 due to the rotation of 8 differs depending on the rotation angle of the eccentric pin 18, and the amount of movement of the master lens group 12 does not change linearly with the rotation of the eccentric pin 18, resulting in an accurate flange. Back adjustment was difficult.

Further, the conventional tracking mechanism has too high sensitivity for a lens that requires a large amount of tracking and cannot be adjusted. Further, the conventional tracking mechanism has a drawback that the adjusted distance is changed by tightening the fixing screw after the tracking adjustment. The present invention has been made in view of such circumstances, and an object thereof is to propose a tracking mechanism for a camera that is easy to adjust and has high accuracy.

[0005]

In order to achieve the above object, the present invention provides a camera for performing tracking adjustment while finely moving a lens supporting frame for holding a lens in the front-back direction along an optical axis of a lens barrel. In the tracking mechanism of
An interlocking member that is movable in the front-rear direction along the optical axis direction of the lens barrel is connected to the lens support frame, and a movable member that is movable in the direction orthogonal to the optical axis is connected to the interlocking member via a tapered surface. It is characterized in that the interlocking member is moved back and forth along the optical axis by contacting and moving the movable member in a direction orthogonal to the optical axis, and the lens support frame is moved back and forth along the optical axis.

According to the tracking mechanism of the camera of the present invention, the interlocking member is connected to the lens support frame, the interlocking member is provided with the movable member via the tapered surface, and the movable member is moved in the direction orthogonal to the optical axis. However, since the interlocking member is moved along the optical axis so that the lens support frame is moved in the front-back direction along the optical axis, the lens support frame changes linearly in accordance with the movement of the movable member. , Tracking adjustment becomes easy.

Further, the movable member is provided with an adjusting screw for moving the movable member in a direction orthogonal to the optical axis, and the adjusting screw is provided with a moderating mechanism. Since rotation is restricted,
The fixing screw after adjustment is unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a camera tracking mechanism according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a sectional structure of a television camera to which the present invention is applied. Inside the lens barrel 20, a focus lens group 24, zoom lens groups 26 and 28, and a relay lens 3 are shown.
0, the master lens group 32 is arranged. A focus ring 34 is rotatably provided on the fixed lens barrel 22, and by rotating the focus ring 34, the focus lens group 24 is moved back and forth via a helicoid screw to perform focus adjustment. There is. A zoom ring 36 is rotatably provided on the fixed lens barrel 22,
When the zoom ring 36 is rotated, the cam cylinder 38 is rotated. On the other hand, the lens support frames 40 and 42 of the zoom lens groups 26 and 28 are linearly guided by a guide bar 44, and their movement is restricted by a cam barrel 38 so that zoom adjustment can be performed.

The master lens group 32 is supported at the rear end of the lens barrel 20 via a lens support frame 46 so as to be movable in the front-rear direction, and a flange mechanism is adjusted by using a tracking mechanism 48, which will be described later, to make a fixed mirror. It is fixed to the body 22.
FIG. 2 shows the detailed structure of the tracking mechanism 48 according to the present invention. In FIG. 2, an interlocking member 50 is disposed on a fixed frame 22A integrated with the fixed lens barrel 22 so as to be movable in the left-right direction (front-back direction along the optical axis).
Has its lower end fitted in a groove 52 formed in the fixed frame 22A and is guided in the front-rear direction along the optical axis of the lens barrel. Further, a pin 51A formed at the lower end of the interlocking member 50
Is fitted into the groove 46A of the lens support frame 46, and when the interlocking member 50 is moved back and forth along the optical axis, the lens support frame 46 is also moved back and forth along the optical axis.

A spring receiver 54, which is formed in a substantially L shape, is attached to the fixed frame 22A through a pin 56, and the spring receiver 54 supports the end portion of a spring 58, and the spring 58 supports the interlocking member 50 in FIG. Energize to the left at the top. Meanwhile fixed frame 2
2A is provided with an adjusting screw 60, a pin 62 is attached to the lower end of the adjusting screw 60, and a movable member 64 is in contact with the head of the pin 62. Since the movable member 64 is supported by the pin 62 and the adjusting screw 60, the movable member 64 moves up and down with respect to the fixed frame 22A by rotating the adjusting screw 60. Further, the tapered surface 64A of the movable member 64 is in contact with the tapered surface 50A of the interlocking member 50. Therefore, when the movable member 64 moves upward, both members move to the tapered surface 50.
A and 60A are in contact with each other, so the interlocking member 50 has a spring 58.
2 is moved to the right in FIG. 2 against the urging force of the movable member 6
When 4 moves downward, the interlocking member 50 moves leftward by the urging force of the spring 58.

A V-groove knurl 6 is provided on the head of the adjusting screw 60.
6 is formed, and a click ball 68 is fitted into this V-groove knurl 66 so that the adjusting screw 60 can be fed in a moderation. That is, as shown in FIG. 3, the click ball 6
8 is arranged in the groove 70 of the fixed frame 22A, and is biased toward the head of the adjusting screw 60 by the leaf spring 72 attached to the fixed frame 22A. As a result, the adjusting screw 60 can be fed by moderation.

The operation of the preferred embodiment of the tracking mechanism of the camera according to the present invention constructed as described above is as follows. First, with the cover 74 shown in FIG. 2 removed, a minus driver or the like is inserted into the minus groove 60A of the adjusting screw 60 and the adjusting screw 60 is rotated clockwise or counterclockwise. When the adjusting screw 60 is rotated, the movable member 64 moves up and down, and accordingly, the interlocking member 50 moves in the front-rear direction.
When the interlocking member 50 moves in the front-rear direction, the interlocking member 50 and the lens support frame 46 are connected via the pin 51, so that the master lens group 32 moves back and forth. This allows the distance between the flange surface 78 of the mount 76 and the focal plane (CCD) (not shown) to be finely adjusted.

According to the above-described embodiment, after the adjustment, the click ball 68 falls into the V-groove knurl 66 of the adjusting screw 60 to prevent the screw 60 from rotating, so that the fixing screw which has been conventionally required is not necessary. According to the above embodiment, the lens support frame 46 is moved in the front-rear direction according to the amount of movement of the movable member 64 in the vertical direction.
Can be moved linearly and tracking adjustment is easy. It can also be applied to lenses that require a large amount of tracking.

According to the above-described embodiment, the amount of adjustment per click can be arbitrarily adjusted by changing the taper angle of the tapered surface 50A of the interlocking member 50 and the tapered surface 64A of the movable member 64, or by increasing or decreasing the number of knurls of the adjusting screw 60. Can be adjusted to. Although the flange back adjustment of the television lens camera has been described in the above embodiment, the present invention is not limited to this, and the tracking mechanism according to the present invention can be applied to the flange back adjustment of a normal camera.

[0015]

As described above, according to the tracking mechanism of the camera of the present invention, the lens support frame can be linearly changed, so that the tracking adjustment becomes easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a television camera to which the present invention is applied.

FIG. 2 is an enlarged sectional view showing a main part of a tracking mechanism of a camera of the present invention.

FIG. 3 is an explanatory view showing the structure of a click mechanism.

FIG. 4 is an enlarged cross-sectional view showing a conventional tracking mechanism.

5 is a view taken in the direction of arrow A in FIG.

[Explanation of symbols]

 20 ... Lens barrel 22 ... Fixed barrel 32 ... Master lens group 46 ... Lens support frame 48 ... Tracking mechanism 50 ... Interlocking member 60 ... Adjusting screw 64 ... Movable member 78 ... Flange surface

Claims (2)

[Claims] 1. A tracking mechanism of a camera for performing tracking adjustment while finely moving a lens support frame for holding a lens along the optical axis of the lens barrel in the front-rear direction, in the optical axis direction of the lens barrel. An interlocking member movable in the front-rear direction along the lens support frame, a movable member movable in a direction orthogonal to the optical axis is brought into contact with the interlocking member via a tapered surface, and the movable member serves as the optical axis. A tracking mechanism for a camera, wherein the interlocking member is moved back and forth along the optical axis by moving in a direction orthogonal to each other, and the lens support frame is moved back and forth along the optical axis. 2. The movable member is provided with an adjusting screw for moving the movable member in a direction orthogonal to the optical axis by being rotated, and the adjusting screw is provided with a moderating mechanism. Camera tracking mechanism.