JPH0613274U - Auto focus mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The autofocus mechanism used in TV cameras in the past has a large inertia because it is a system that drives the lens group made of glass inside the lens as a motor. It has the disadvantages of poor performance, high power consumption, and high price. The present invention is designed to eliminate the above drawbacks. According to the present invention, a solid-state image sensor 12 slidably supported by a guide shaft 2 is moved forward and backward by a feed screw 6 fixed to an output shaft of a motor 7.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an autofocus mechanism used in a TV camera.

[0002]

[Prior art]

 Conventionally, what has been used as an autofocus mechanism has a focus mechanism on the lens side.

[0003]

[Problems to be solved by the device]

 In the conventional autofocus mechanism, it is necessary to drive the lens group made of glass as a motor, and since the inertia is large, the response is poor and the power consumption is large.

[0004]

[Means for Solving the Problems]

 The present invention was devised to solve the above-mentioned problems, and aims to achieve the object by supporting the solid-state imaging device 12 having a small mass using the guide shaft 2 and driving it in the front-back direction from the motor 7. To do.

[0005]

[Action]

 The operation of the present invention will be described. By processing the image signal by computer and applying a voltage in the forward and reverse directions to the motor 7, the feed screw 6 rotates, and the solid-state image sensor 12 adhered and fixed to the slider 4 moves back and forth. It moves and automatically adjusts the optical distance.

[0006]

【Example】

 Referring to the drawings, the flange 1 has a lens 11 which is C-mount coupled, a screw-coupled upper cover 9 and a lower cover 10 at approximately the center thereof. The two guide shafts 2 are fixed to the connecting plate 3 to which the motor 7 is fixed by the flange 1 at the left end and the band 8 at the right end, respectively. Two bushes 5 slidably inserted in the guide shaft 2 are fixed to the slider 4 to which the solid-state image sensor 12 is fixedly attached. The feed screw 6 fixed to the output shaft of the motor 7 is rotatably screwed to the slider 4.

[0007]

[Effect of device]

 As described in detail above, this invention is to perform autofocusing by moving a light-weight solid-state image pickup device back and forth, so that the inertia is small and the response is good and energy saving is achieved. Moreover, it does not require a lens with a focus function and a fixed focus lens is sufficient, so the overall weight is light and the price is low.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of the present invention.

FIG. 2 is a cross-sectional view of a main part of a side surface of the present invention.

[Explanation of symbols]

 1 Flange 2 Guide shaft 3 Connection plate 4 Slider 5 Bushing 6 Feed screw 7 Motor 8 Band 9 Upper cover 10 Lower cover 11 Lens 12 Solid-state image sensor

Claims (1)

[Scope of utility model registration request] 1. A bush (5) slidably inserted in a guide shaft (2) is fixedly supported by a slider (4) to which a solid-state image sensor (12) is adhesively fixed, and is attached to an output shaft of a motor (7). An autofocus mechanism configured by a fixedly supported feed screw (6) being rotatably screwed to a slider (4).