Varifocal optical system and associated electro-mechanical control
AssigneeU.S. Philips Corporation
InventorsJean-Claude Perrin, Joel Rollin
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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.
Claims7
A varifocal optical system controlled electro-mechanically for focal distance variation and thus magnification, temperature correction focussing and finite distance focussing, comprising four single element lenses, two of said lenses being movable and axially translatable to vary the magnification, only one of the two movable lenses being adapted for temperature correction focussing and finite distance focussing, and electro-mechanical means for controlling the movement of the two movable lenses in a discrete manner.
Dependencies are inferred from the claim text.