Zoom lens with differential focal compensation for visible, IR,

Details Zoom lens with differential focal compensation for visible, IR, Zoom lens with differential focal compensation for visible, IR,

1995-09-20

1997-11-25

Nelms, David C.

Optical: systems and elements

Lens

With support

359824, 359696, G02B 702, G02B 1514

Patent

active

056918542

ABSTRACT:
To use a zoom lens mechanism in visible light, a switch is turned off. By force of a spring, a cam pin of a correction lens is contacted with a first edge of a cam groove which is formed to have a shape which corrects a focal inadequacy resulting from a movement of a variable magnification lens in visible light. Accordingly, the movement of the correction lens is controlled by the first edge. To use the zoom lens mechanism in near infrared light, the switch is turned on. By magnetic force of an electromagnet, the cam pin is contacted with a second edge of the cam groove which is formed to have a shape which corrects the focal inadequacy resulting from the movement of the variable magnification lens in near infrared light. Accordingly, the movement of the correction lens is controlled by the second edge.

REFERENCES:
patent: 4976523 (1990-12-01), Ishikawa
patent: 5016993 (1991-05-01), Akitake
patent: 5144491 (1992-09-01), Ushiro
patent: 5172276 (1992-12-01), Ueyama

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