JPH0822068A - Camera stabilizer - Google Patents

Abstract

PURPOSE:To provide a camera stabilizer provided with a balance adjusting device correcting mass unbalance caused by the displacement of a lens moving part in the case of zooming operation and focusing operation in the lens moving part of a camera. CONSTITUTION:This camera stabilizer in which the camera 10 is attached to a pitch gimbal 2, the pitch gimbal 2 is attached to an azimuth gimbal 3, the lens moving part 1 and a balance weight 4 attached to the camera 10 are mass balanced around the elevation shaft (x) of the pitch gimbal 2 is constituted in a state where an auxiliary balance weight 8 is moved in a reverse direction to that of the zooming operation and the focusing operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera stabilizer, and more particularly to a camera provided with a balance adjusting device for correcting a mass unbalance due to a displacement of a lens movable portion during zoom operation and focus operation of the lens movable portion of the camera. Regarding stabilizers.

[0002]

2. Description of the Related Art A conventional example of a camera stabilizer will be described with reference to FIG. In FIG. 2, 10 indicates a camera.
Reference numeral 1 denotes a lens movable portion of the camera, which is zoomed or focused in the axial direction indicated by the arrow along the lens barrel attached to the camera 10. Reference numeral 4 denotes a balance weight, which is fixed to an end portion of an attachment member attached to the camera 10. Reference numeral 2 denotes a pitch gimbal, which rotatably supports the camera 10 around an elevation axis indicated by x. Reference numeral 3 denotes an azimuth gimbal, which rotatably supports the pitch gimbal 2 that supports the camera 10 about an azimuth axis indicated by z.

Here, when the camera 10, the lens movable portion 1 and the balance weight 4 are attached to the camera stabilizer composed of the pitch gimbal 2 and the azimuth gimbal 3 as described above, there is a mass unbalance around the elevation axis x. Then, the stabilization performance of the camera is affected. Therefore, when assembling the camera and the gimbal mechanism that constitutes the camera stabilizer, the mass balance around the elevation axis x is adjusted. To adjust the mass balance around the elevation axis x, the lens movable unit 1 is set at a predetermined position in the lens drive axis direction, and the camera 10
Regardless of the orientation of the lens movable portion 1 around the elevation axis x, the balance weight 4 is adjusted so as to satisfy the mass balance around the elevation axis x.

[0004]

Although the camera 10 mounted on the camera stabilizer composed of the pitch gimbal 2 and the azimuth gimbal 3 as described above has been subjected to mass balance adjustment around the elevation axis x, No measures or compensation measures are taken for the movement of the center of gravity in the lens drive axis direction caused by zooming and focusing operations of the lens movable portion 1 of the camera 10.

By the way, when the camera 10 is used as a television camera for news reports by being mounted on a helicopter, a vehicle, or any other device that vibrates, the camera 10 can be used as long as the mass balance around the elevation axis x can be maintained. Even if some vibration is applied, the direction of the lens movable portion 1 of the camera 10 does not change. However, when a slight mass imbalance occurs around the elevation axis x by zooming and focusing the lens movable unit 1 of the camera 10, the orientation of the lens movable unit 1 is changed by the applied vibration. The direction changes.

The present invention provides a camera stabilizer which solves the above problems.

[0007]

A camera 10 is mounted on a pitch gimbal 2, a pitch gimbal 2 is mounted on an azimuth gimbal 3, and a lens movable part 1 and a balance weight 4 mounted on the camera 10 are elevated from the pitch gimbal 2. In the camera stabilizer that is mass-balanced around the axis x, the camera stabilizer is provided with the auxiliary balance weight 8 that can be moved in the direction opposite to the direction of the zoom operation or the focus operation.

A pulse motor 5, a ball screw 6, a linear guide 7, and an auxiliary balance weight 8 which are provided with a housing 9 attached to the camera 10 and which are attached to the housing 9 aligned on an axis parallel to the lens drive axis. And a detector for detecting the displacement of the lens movable unit 1 in the lens drive axis direction in conjunction with a zoom operation or a focus operation, and provided with comparison data between the detected displacement and the mass imbalance. Then, the camera stabilizer is configured to rotate the pulse motor 5 based on the comparison data to move the auxiliary balance weight 8 in the direction opposite to the direction of the zoom operation or the focus operation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a simple view schematically showing an embodiment of the present invention, in which a camera 10 is attached to a pitch gimbal 2,
In the camera stabilizer in which the pitch gimbal 2 is attached to the azimuth gimbal 3, a housing indicated by 9 is attached to the camera 10, and the housing 9
Is mounted on the axis parallel to the lens drive axis on which the lens movable unit 1 is driven, by attaching a pulse motor indicated by 5, a ball screw indicated by 6, a linear guide indicated by 7 and an auxiliary balance weight indicated by 8. Is shown. That is, the pulse motor 5 is fixed to one end of the housing 9 attached to the camera 10. The ball screw 6 extends from the pulse motor 5 in parallel with the lens drive shaft on which the lens movable unit 1 is driven, and is rotated by the pulse motor 5. The ball screw 6 is screwed with a linear guide 7 in the vicinity of the other end of the housing 9 to slide the linear guide 7 in the arrow direction. Although not explicitly shown in the figure, the linear guide 7 is fitted in a guide groove formed in the horizontal portion of the housing 9 and slides in the direction of the arrow. Then, the auxiliary balance weight 8 is fixed to the linear guide 7 and slides in the direction of the arrow.

With this configuration, when the lens movable portion 1 is driven and displaced by zooming or focusing the lens movable portion 1, the mass balance about the x axis caused by the displacement is an auxiliary balance weight. 8 can be driven by the pulse motor 5 for correction, and the pitch gimbal 2 can be always balanced. In order to detect the displacement of the lens movable unit 1 in the lens drive axis direction in conjunction with the zoom operation or the focus operation, for example, the slider of the built-in potentiometer is detected in conjunction with the zoom operation or the focus operation. be able to. Here, the comparison data between the detected displacement of the lens movable unit 1 and the mass imbalance is measured in advance, and the pulse motor 5 is moved in the direction opposite to the direction of the zoom operation or the focus operation based on this data. By rotating to drive the linear guide 7 and moving the auxiliary balance weight 8, the mass imbalance around the elevation axis x between the lens movable portion 1 and the balance weight 4 is corrected.

[0011]

As described above, the balance adjusting device for a camera stabilizer according to the present invention is arranged around the elevation axis x of the pitch gimbal 2 due to the displacement of the mass of the lens movable portion 1 in the lens drive axis direction. The mass unbalance can be finely corrected and adjusted by moving the auxiliary balance weight 8 using the pulse motor 5 and the ball screw 6. Therefore, the elevation axis x of the pitch gimbal 2
Since the mass balance around is always maintained, even if vibration is applied to the camera stabilizer, the directions of the lens movable part 1, the lens barrel, and the balance weight 4 of the camera attached thereto are deflected. As a result, the lens movable portion 1 of the camera is always kept in the controlled direction, and the operation performance of the camera is improved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example.

FIG. 2 is a diagram illustrating a conventional example.

[Explanation of symbols]

 1 Lens Moving Part 2 Pitch Gimbal 3 Azimuth Gimbal 4 Balance Weight 5 Pulse Motor 6 Ball Screw 7 Linear Guide 8 Auxiliary Balance Weight 9 Housing 10 Camera x Elevation Axis

Claims (2)

[Claims] 1. A camera stabilizer in which a camera is attached to a pitch gimbal, a pitch gimbal is attached to an azimuth gimbal, and a lens movable part and a balance weight attached to the camera are mass-balanced around an elevation axis of the pitch gimbal. A camera stabilizer comprising an auxiliary balance weight that can be moved in a direction opposite to the direction of zoom operation or focus operation. 2. The camera stabilizer according to claim 1, further comprising a housing attached to the camera, wherein the pulse motor, the ball screw, and the linear guide are attached to the housing aligned on an axis parallel to the lens driving axis. , Equipped with an auxiliary balance weight, equipped with a detector for detecting the displacement of the lens movable part in the lens drive axis direction in conjunction with zoom operation or focus operation, and comparing the detected displacement with the mass imbalance. A camera stabilizer, comprising data, wherein the auxiliary balance weight is moved in a direction opposite to a direction of a zoom operation or a focus operation by rotating a pulse motor based on the comparison data.