Optical: systems and elements – Lens – With variable magnification
Patent
1992-12-21
1993-12-21
Arnold, Bruce Y.
Optical: systems and elements
Lens
With variable magnification
359726, 359735, 359785, 359791, G02B 1700, G02B 958
Patent
active
052725650
ABSTRACT:
The invention provides a compact zoom lens system which has an angular coverage from wide angle to moderate telephoto and makes a relatively bright and parallax-free TTL finder possible and in which a first unit 11 having a positive power as a whole is located on the side proximate to the object. The lens system includes a reflective means 13c located more closely to the image side than the first unit 11 for guiding incident light to a finder subsystem and a movable lens unit that moves for zooming. The movable lens unit comprises a sub-unit 13a having a positive power as a whole and located on the object side of the reflective means 13c and a sub-unit 13b having a negative power as a whole and located on the images side of the reflective means 13c, or alternatively a sub-unit having a negative power as a whole and located on the object side of the reflective means and a sub-unit having a positive power as a whole and located on the image side of the reflective means. The movable lens unit has an aperture stop located therein or adjacent thereto.
REFERENCES:
patent: 3620602 (1971-11-01), Kawazu
patent: 3649101 (1972-03-01), Straw et al.
patent: 3658411 (1972-04-01), Price
patent: 4249798 (1981-02-01), Moskovich
patent: 4614409 (1986-09-01), Sakai
patent: 4707103 (1987-11-01), Ikemori et al.
patent: 4730199 (1988-03-01), Ikemori et al.
patent: 4731527 (1988-03-01), Nomura et al.
patent: 4838668 (1989-06-01), Betensky et al.
Arnold Bruce Y.
Lester Evelyn A.
Olympus Optical Co,. Ltd.
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