Varifocal optical system and associated electro-mechanical contr

Details Varifocal optical system and associated electro-mechanical contr Varifocal optical system and associated electro-mechanical contr

1988-06-03

1990-03-13

Arnold, Bruce Y.

354428, G02B 1514

Patent

active

049078674

ABSTRACT:
This varifocal optical system is electro-mechanically controlled to vary focal distance, temperature correction focussing and finite distance focussing. It is constituted by four single lenses (L1, L2, L3 and L4) two of which (L2, L3) are movable and are axially translated to vary the magnification, while only one (L3) of these two lenses is adapted for temperature correction focussing and finite distance focussing. It is also consituted by electro-mechanical member (EMM) which are especially adapted to control the movements of the two movable lenses (L2, L3) in a discrete manner.

REFERENCES:
patent: 4037234 (1977-07-01), Tunekawa et al.
patent: 4161756 (1979-07-01), Thomas
patent: 4193667 (1980-03-01), Yasukuni et al.
patent: 4668069 (1987-05-01), Hasegawa
patent: 4697891 (1987-10-01), Kawai

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