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Varying-focus lens with focal length regulator

A technology of variable focal length and lens, which is applied in the direction of camera, focusing device, installation, etc., can solve the problems of poor precision of lens components and unreliable mechanical movement, etc., and achieve the effect of great stability and reliability

Inactive Publication Date: 2005-06-01
张炳炎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Steeper gradients lead to poor accuracy of the lens elements of Group 2 and unreliable mechanical movement

Method used

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  • Varying-focus lens with focal length regulator
  • Varying-focus lens with focal length regulator
  • Varying-focus lens with focal length regulator

Examples

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Embodiment Construction

[0014] In the specification and appended claims, the terms "consisting of", "comprising" and "comprising" are meant to be expansive in their meaning and are to be understood as having "without limitation "the meaning of. The term "coupled" refers to a direct mechanical coupling or an indirect mechanical coupling via a mechanical connection or intermediate device. Also, certain elements or parts considered to be components of the varifocal lens arrangement are omitted from the drawings in order to clarify the present invention. For example, each lens group may contain multiple lenses fixed at different positions along the optical axis. Different zoom lens configurations may include different numbers of lenses in each lens group. Thus, the exact position of the individual lenses can be varied. It should be understood that the description of the motion of a particular lens group refers to the motion of all lenses belonging to that lens group.

[0015] Referring first to FIG. ...

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Abstract

A variable focal length lens device, which couples a second lens group to the first lens group, so that a cam mechanism can drive the two lens groups. The second lens group is also provided with a second cam mechanism which can provide the fine distance adjustment required for proper focus correction of the second lens group.

Description

technical field [0001] The present invention relates generally to a zoom lens arrangement, and more particularly to a zoom lens arrangement having a distance adjustment mechanism for first and second lens groups. Background technique [0002] Conventional zoom devices generally have two movable lens groups. The first lens group is generally used for magnification purposes, while the second lens group is used for focus correction. Adjust the distance between the two lens groups and the film surface to achieve the zoom effect. The lens elements of Group 1 are used for focus adjustment, while the lens elements of Group 2 are used for focus correction and are positioned between the lens elements of Group 1 and the film surface. To achieve the zoom effect, the lens elements of group 1 are moved a distance X away from the film surface, and the lens elements of group 2 are also moved a distance Y away from the film surface in order to focus the image on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/10
CPCG02B7/10
Inventor 张炳炎
Owner 张炳炎