Macro focusing device for variable focal length lens专利检索-微距镜头光学透镜摄影专利检索查询-专利查询网

Macro focusing device for variable focal length lens

阅读：30发布：2021-02-18

专利汇可以提供Macro focusing device for variable focal length lens专利检索，专利查询，专利分析的服务。并且For a zoom objective with macro photography capability, movable elements are selectively adjusted by a simplified lens moving device to cause either changes of focal length or changes of the focus zone from a normal zone to a close-up or macro photography zone. In a sleeve of the lens mount is formed a pair of elongated grooves in which cam follower pins respectively on a variator lens cell and a compensator lens cell are carried for simultaneous adjustment during varying the focal length of the objective when adjusted together by cam slots in a cell supporting barrel. A relief groove is formed in the sleeve to permit the variator lens to be adjusted without altering the compensator lens cell for focusing the objective lens at close distances.，下面是Macro focusing device for variable focal length lens专利的具体信息内容。

权利要求

1. In a lens mount for a variable focal length objective lens defining an optical axis and being capable of close focusing relative to a camera housing, the lens having a variator lens cell and a compensator lens cell, the improvement comprising: a barrel fixed to the camera housing and having first and second cam slots formed therein; an operating sleeve arranged for rotational and axial movement relative to the optical axis for causing focal lenght varation by simultaneous adjustment of said variator and compensator lens cells and close focusing by adjustment of said variator lens cell alone including: an elongated groove for driving said variator lens cell relative to said barrel upon rotation when said sleeve is in either a first axial position for focal length variation or a second axial position for close focusing; an elongated groove for driving said compensator lens cell relative to said barrel upon rotation when said sleeve is in said first axial position; the variator lens cell having a guide pin cooperating with one of said cam slots in said barrel and one of said elongated groove in said sleeve; and the compensator lens cell having a guide pin cooperating with another of said cam slots in said barrel and another of said elongated grooves in said sleeve; the sleeve further including: a relief groove for selectively receiving said guide pin of said compensator lens cell when said sleeve is in one of said axial positions so that only said variator lens cell is driven axially in said barrel upon rotation of said sleeve.

2. A lens mount as in claim 1 wherein said cam slots formed in said barrel cause rotation and axial displacement oF said lens cells upon rotational drive by said sleeve when said guide pins on said lens cells engage in said elongated grooves of said sleeve.

3. A lens mount as in claim 2 wherein said relief groove in said sleeve is open to one of said elongated guide pin receiving grooves to permit relative movement of said guide pin to and from said relief groove and said elongated groove.

4. A lens mount as in claim 3 including a lens supporting ring attached to the camera housing and having a limit slot formed longitudinally therein along which a limit pin on said sleeve is displaceable.

5. A lens mount as in claim 4 wherein said lens supporting ring is provided with a U-shaped guide slot including said limit slot and, a pair of legs extending therefrom, said limit pin movable from said limit slot into said legs during lens adjusting operations.

6. A lens mount as in claim 5 wherein a spring is arranged relative to said sleeve to cause said limit pin to engage one end of said limit slot, while permitting manual displacement of said sleeve to cause said limit pin to engage the other end of said limit slot.

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Macro focusing device for variable focal length lens

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