Zoom lens structure

Details Zoom lens structure Zoom lens structure

1981-08-07

1984-03-27

Henry, Jon W.

G02B 710, G02B 1518

Patent

active

044390181

ABSTRACT:
In the disclosed zoom lens structure, the zoom system forms an optical axis and includes a focusing lens group, a variator lens group, and an image forming lens group. A cam arrangement serves for moving the focusing lens group along the optical axis while a zooming arrangement serves to displace the variator lens group along the optical axis to adjust the focal length of the system. A compensating arrangement rotates the focusing lens group while simultaneously moving it together with the variator lens group along the optical axis to compensate the focusing of the system. In one embodiment, the cam arrangement forms a first cam range for focusing in a normal range and a second cam range for macrofocusing. Here, the zooming arrangement defines a predetermined variator operating range and a predetermined macrophotography position with the variator lens group and the focusing lens group connected to each other only in the macrophotography position to move along the optical axis in the second cam range.

REFERENCES:
patent: 4324457 (1982-04-01), Tomori

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