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Focusing device for manual focus lenses

A manual focusing, lens technology, applied in focusing device, installation, optics and other directions, can solve the problem of difficult to ensure accurate rotation focusing position and so on

Active Publication Date: 2018-06-01
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes it difficult to ensure accurate rotation to the desired focus position

Method used

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  • Focusing device for manual focus lenses
  • Focusing device for manual focus lenses
  • Focusing device for manual focus lenses

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0018] As shown in Figure 1, it is the adjustment device of the manual focus lens involved in this embodiment, including: the rear movable cylinder 5, the front movable cylinder 4, the fixed ring 2 and the focus ring which are sequentially sleeved on the outside of the lens from the outside to the inside 1, wherein: the focus ring 1 and the front moving cylinder 4 are engaged and driven by a planetary gear set, and the outer side of the front moving cylinder 4 is provided with a linear cam groove 40 to cooperate with the first screw group 20 on the fixed ring 2 to move forward The inner side of the barrel 4 is provided with a second screw group 41 to cooperate with the curved cam groove 50 and the straight-forward key 51 on the rear moving barrel 5 .

[0019] Such as figure 2 As shown, the inside of the focusing ring 1 is provided with an internal gear 10, which forms a planetary gear set with the planetary gear 3 and the sun gear 42 on the front moving cylinder 4. By rotatin...

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PUM

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Abstract

A focusing device for manual focus lenses comprises a rear moving barrel, a front moving barrel, a fixing ring and a focusing ring which sequentially sleeve the exterior of a lens from outside to inside. The focusing ring and the front moving barrel are connected and linked through a planetary gear group. Limited linkage at different angular velocity is achieved between the inner and outer sides of the front moving barrel on one hand and the rear moving barrel and the fixing ring on the other hand through a keyway structure. The device carries out focusing by making the two layers of moving barrels connected with each other simultaneously move to each other or away from each other along the optical axis. The movement of the whole lens is greatly reduced. Therefore, the focusing ring can rotate at a large angle while the overall length of the lens is shortened, and it is ensured that the lens can be precisely focused.

Description

technical field [0001] The invention relates to a technology in the field of optical devices, in particular to a focus adjustment device for a manual focus lens. Background technique [0002] The existing moving rear group focus adjustment lenses are relatively large in size and heavy in weight. When taking pictures, there will be a phenomenon that the lens cannot be completely kept stable due to the heavy weight of the lens, resulting in blurred images. The rotatable full angle range of the focusing ring of the existing lens is small and the adjustable angle range of the distance object distance is small. This makes it difficult to ensure accurate rotation to the desired focusing position. Contents of the invention [0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes a focus adjustment device for a manual focus lens, which performs focus adjustment by moving two layers of connected moving cylinders in the direction of the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/04G03B13/32
CPCG02B7/04G03B13/32
Inventor 徐雄飞曹葛濛诸益炜尚洁阳李斌馏
Owner JIAXING ZHONGRUN OPTICAL TECH
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