Multi-group focusing mechanism and lens

Abstract

The invention discloses a multi-group focusing mechanism and a lens. The multi-group focusing mechanism comprises a straight feeding cylinder, wherein the side wall of which is provided with a plurality of straight feeding grooves; a first focusing group, a second focusing group and a third focusing group, which are sequentially assembled in the straight feed cylinder, and wherein positioning holes are formed in the outer side walls of the first focusing group, the second focusing group and the third focusing group; a CAM cylinder, which is rotatably arranged outside the straight feeding cylinder in a sleeving manner, and three groups of CAM grooves which are distributed at intervals are formed in the side wall of the CAM cylinder; three groups of transmission assemblies, each of which correspondingly penetrates through the CAM grooves and the straight feeding grooves and then is connected with the positioning holes in a fastened mode. According to the scheme, a plurality of straight feeding grooves are formed in the straight feeding cylinder, and a plurality of groups of CAM grooves are formed in the CAM cylinder; in cooperation with transmission of the three sets of transmission assemblies, simultaneous stable focusing of the multiple focusing groups can be achieved, and the three sets of transmission assemblies move in different CAM grooves, so that the three sets of focusing groups can be combined in a linkage mode to form a larger focusing angle.

Description

technical field [0001] The invention relates to the field of optical lenses, in particular to a multi-group focusing mechanism and a lens. Background technique [0002] With the widespread application of film and television lenses in photography, filming, live video, and photographic cameras, it is necessary to adapt the lens to the needs of different object distances, especially consumer film lenses. High, high-demand imaging is bound to have more focus groups for optical design imaging, a larger focus rotation angle, and a better focus feel. At present, most of the lens structures in the film and television lens industry are thread focus and external CAM focus structures, which cannot achieve large-angle focus, let alone an optical system that is suitable for multiple focus groups. [0003] Therefore, there is an increasing urgency for a structure that has a stable transmission focus, a large focus angle, and can control multiple focus groups through multiple CAM slots. ...

AI Technical Summary

Problems solved by technology

At present, most of the lens structures in the film and television lens industry are threaded focusing and external CAM focusing structures, which cannot achieve large-angle focusing, and are not suitable for optical systems that focus on multiple focus groups.

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