Zooming transmission system with self-locking performance for zoom lens

Abstract

The invention belongs to the technical field of optical instruments, and provides a zooming transmission system with a self-locking performance for a zoom lens in order to solve the problem that the conventional zooming transmission mechanism has an insufficient output torque or an insufficient output rotational speed when the elevation angle of the zoon lens is increased gradually. The zooming transmission system comprises a high-precision rotary potentiometer, a direct current motor, an elastic shaft coupling joint, an output gear, a support box body, a main lens barrel, an output shaft, a worm wheel, a worm rod, a box body and a motor seat; the direct current motor is fixed on the motor seat; the motor seat is fixed on the box body; the direct current motor is connected with the shaft where the worm rod is through the elastic shaft coupling joint; the worm rod is precisely meshed with the worm wheel; the worm rod is used for driving the worm wheel to perform transmission; the worm wheel is fastened on the output shaft through a taper pin; the output gear is fixed on the output shaft through a taper pin likewise; the output shaft is in rigid connection with the rotary potentiometer through a pin bolt; and the output gear is precisely meshed with the gear of a cylindrical cam. According to the zooming transmission system provided by the invention, the problems are solved, so that the response speed and reliability of the zoom lens are improved.

Description

technical field [0001] The invention belongs to the technical field of optical instruments, in particular to a variable-magnification transmission mechanism with self-locking performance of a zoom lens. Background technique [0002] In the process of tracking and measuring the target, the focal length of the zoom lens can be continuously changed, and the length of the focal length can be adjusted according to the distance and size of the tracking target, so that the target is always kept in the tracking and measuring field of view. Such as figure 1 As shown, the change of the focal length of the zoom lens is realized by the corresponding movement of the variable power component 4 and the compensation component 5, and the corresponding movement of the variable power component 4 and the compensation component 5 is achieved by the precision curved grooves respectively processed on the cylindrical cam 2. To ensure that the axial rotary motion of the cylindrical cam 2 drives the...

AI Technical Summary

Problems solved by technology

When the deceleration ratio is fixed, the variable power transmission mechanism can output a larger torque only by increasing the reserve margin of the working torque of the DC motor; But the increase of the speed ratio will lead to the decrease of the output speed, and finally affect the quick response of the cam rotation

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