Large-aperture telephoto zoom lens

Details Large-aperture telephoto zoom lens Large-aperture telephoto zoom lens

2005-03-15

2005-03-15

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000

Reexamination Certificate

active

06867924

ABSTRACT:
A zoom lens includes, in order from an object side, a first lens unit with positive power; a second lens unit with positive power; and a third lens unit with negative power. When the magnification of the zoom lens is varied, extending from a wide-angle position to a telephoto position, spacings between the first lens unit and the second lens unit and between the second lens unit and the third lens unit become wider at the telephoto position than at the wide-angle position, and the third lens unit remains fixed. Thus, a telephoto zoom lens which has a large aperture and in which aberrations extending from infinity to a short distance are favorably corrected can be provided.

REFERENCES:
patent: 4269484 (1981-05-01), Laurent
patent: 5537259 (1996-07-01), Ogawa
patent: 5764420 (1998-06-01), Yahagi
patent: 6243212 (2001-06-01), Sanson et al.
patent: 60-150020 (1985-08-01), None
patent: 2000-019398 (2000-01-01), None

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