Optical apparatus having lens control device

Details Optical apparatus having lens control device Optical apparatus having lens control device

1992-05-18

1994-06-21

Adams, Russell E.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

G03B 118

Patent

active

053232003

ABSTRACT:
An optical apparatus is arranged in a compact size and yet to be capable of adequately performing lens control whereby, in the optical system of the apparatus which is of the kind having a focusing lens arranged to compensate for a shift of a focal plane caused by a power varying action, the speed of the movement of a zooming lens is reduced when the speed of the movement of the focusing lens increases following the movement of the zooming lens.

REFERENCES:
patent: 4847650 (1989-07-01), Iida et al.
patent: 5028773 (1991-07-01), Hata
patent: 5060001 (1991-10-01), Kaneda
patent: 5075713 (1991-12-01), Sakata
patent: 5144492 (1992-09-01), Iijima et al.
patent: 5157432 (1992-10-01), Fukuoka et al.

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