JPH0219791Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating mechanism for an electronic viewfinder in a television camera.

In order to facilitate photographing operations, conventional electronic viewfinders for television cameras have been equipped with a rotating mechanism so that the screen always faces the operator.

In this case, a mechanism is required to fix the direction of rotation at a predetermined rotation angle so that the electronic viewfinder does not move due to vibration or the like.

This fixing mechanism often has a braking direction, and is operated and fixed by an operating lever that moves within a limited angular range.

Since the brake positioning of this operating lever must be performed within a limited angular range, it is necessary to increase the machining accuracy of the parts of the brake mechanism or to increase the thread pitch of the threaded part that directly generates the braking force. Increasing the thread pitch weakens the generation of braking force, so it was necessary to lengthen the operating lever.

In order to eliminate these drawbacks, the present invention can determine the appropriate position of the operating lever without increasing the screw pitch, and without increasing the length of the operating lever.
It is designed to generate a large braking force.

1, 2, and 4 are embodiments of the present invention, and FIG. 3 is a conventional example, in which 1 is a camera head, 2 is a viewfinder, 3 is a fixed base, 3a is a fixed base flange, and 4 is a rotating part, 5 is an operating lever, 5a is a mounting screw hole, 6 is a shaft, 6a is a mounting hole,
7 is a mounting screw, 8 is a brake piece, and 9 is a stopper.

Here, the shaft 6 is threadedly engaged with the rotating part 4, and the operating lever 5 and the brake piece 8 attached to the shaft 6 form a brake mechanism.

In this operation, the rotating part 4 can be rotated relative to the fixed base 3 fixed to the camera head 1. Since the viewfinder 2 is fixed to the rotating part 4, the screen position of the viewfinder 2 can be changed.

When fixing the rotating part 4, use the operating lever 5.
By operating the brake lever in the braking direction, the brake piece 8 screwed to the shaft 6 touches the flange part 3 of the fixed base 3.
a and tightens it, fixing the fixed base 3 and rotating part 4, and fixing the position of the screen of the viewfinder 2.

The present invention is characterized by the structure of the mounting part of the operating lever 5 in such a brake mechanism, and the operating lever 5 has a plurality of mounting screw holes, eight in this case, around the rotating shaft 6. 5a has been opened. Further, the shaft 6 has a plurality of mounting holes 6a, seven in this case, for mounting on the operating lever 5.

Here, the number of mounting holes for the operating lever 5 and the shaft 6 are not the same, but one of them has more holes. In this case, the shaft 6 has one more space. This allows the operation lever 5 to be
It is possible to make minute adjustments to the mounting angle.

The minimum mounting adjustment angle is expressed by the difference between the drilling angles θ ₁ and θ ₂ of the mounting holes 5a and 6a of the operating lever 5 and the shaft 6, respectively.

In other words, the larger the number of mounting holes, or the closer the difference in the number of holes is to 1, the finer the adjustment of the mounting angle of the operating lever 5.

As explained above, according to the present invention: 1. Since the mounting angle of the operating lever can be adjusted by minute angles, there is little variation in the mounting position of the operating lever, and a stable position can be obtained.

2. Since the thread pitch of the two shafts can be reduced, the operating lever can be shortened even when obtaining the same braking force, resulting in good operability and a smaller mechanism.

[Brief explanation of drawings]

Fig. 1 is a side view of the television camera, viewfinder, and rotation mechanism, Fig. 2 is a partial sectional structural view of the rotation mechanism, Fig. 3 is a perspective view showing the mounting structure of the operating lever and shaft of the conventional rotation mechanism, and Fig. 4 The figure is a perspective view showing the mounting structure of the operating lever and shaft of the rotating mechanism of the present invention. 5...Operation lever, 5a...Mounting screw hole, 6...
...Shaft, 6a...Mounting hole, 7...Mounting screw.

Claims (1)

[Scope of utility model registration request] A screw hole is provided at the end of the rotating body that is rotatably fitted on the fixed base, and the shaft, through which the operating lever is passed, has a flange shape at one end and a threaded portion at the other end, and is screwed together with the brake piece into the screw hole. , and a mounting hole provided on the periphery of the flange-shaped portion of the shaft and a mounting screw hole provided on the opposing periphery of the operating lever are fixed with a screw, and when the operating lever is operated in the rotational direction, the brake piece is In a brake mechanism that contacts a fixed base and tightens and fixes the rotating body to the fixed base, the number of mounting holes provided on the periphery of the flange-shaped part of the shaft and the mounting screws provided on the opposite periphery of the operating lever. A brake mechanism for a rotating body, characterized in that the mounting position of the operating lever can be adjusted within a minute range by making a difference in the number of holes so that the operating lever can be mounted on the shaft.