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Focusing device for manual focus lenses

A manual focusing and lens technology, applied in focusing devices, installations, instruments, etc., can solve problems such as difficulty in ensuring accurate rotation and focusing positions

Active Publication Date: 2020-04-14
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
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Embodiment Construction

[0018] Such as Figure 1a and Figure 1b As shown, it is the adjustment device of the manual focus lens involved in this embodiment, including: the rear moving cylinder 5, the front moving cylinder 4, the fixed ring 2 and the focus ring 1 which are sequentially sleeved on the outside of the lens from the outside to the inside, wherein : The focus ring 1 and the front moving cylinder 4 are meshed and driven by a planetary gear set. 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. The inside of the front moving cylinder 4 A second screw group 41 is provided for cooperating with the curved cam groove 50 and the straight-forward key 51 on the rear moving cylinder 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 ...

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Abstract

A focusing device for a manual focus lens, comprising: a rear moving cylinder, a front moving cylinder, a fixed ring and a focus ring that are sequentially sleeved on the outside of the lens from outside to inside, wherein: the focus ring and the front moving cylinder pass through The planetary gear sets are connected and linked, and the inner and outer sides of the front moving cylinder are respectively connected with the rear moving cylinder and the fixed ring through the keyway structure to realize the limit linkage with different angular velocities. This device adjusts the focus by moving the moving tubes connected by two layers in the direction of the optical axis at the same time or relative to each other, which greatly reduces the overall movement of the lens and thus shortens the total length of the lens. The rotation of the range ensures that the lens can be accurately 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 Patents(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