Patent
1988-04-28
1989-08-08
Arnold, Bruce Y.
350429, G02B 710, G02B 1516
Patent
active
048546852
ABSTRACT:
Two movable groups of lenses forming a variator are controlled by means of a computer and these groups are accordingly subjected not only to the necessary displacements of each group for the progressive variations of focal length but also to a complementary longitudinal displacement for applying to the objective-lens system a focal-length multiplier coefficient having a value chosen by the operator. The device in accordance with the invention comprises a control system associated with a computer and capable of subjecting the two movable groups of lenses to a complementary longitudinal displacement in order to apply a focal length multiplier coefficient to the objective-lens system, another function of the computer being to produce the desired variation of the iris and the complementary displacements of the focusing groups in respect of each focal length. The longest possible focal length can thus be chosen as a function either of the selected numerical aperture or of the field to be covered.
REFERENCES:
patent: 4043642 (1979-08-01), Hirose et al.
patent: 4541695 (1985-09-01), Wainwright et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4708444 (1987-11-01), Tsuji
"Television Zoom Lens with Three Integrated Zoom Ranges", S.M.P.T.E. Journal, vol. 91, No. 9, Sep. 1982, By K. Macher, pp. 808-815.
Arnold Bruce Y.
Etablissements Pierre Angenieux
Gass Rebecca D.
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