Image taking lens system

Details Image taking lens system Image taking lens system

2005-05-10

2005-05-10

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S771000

Reexamination Certificate

active

06891684

ABSTRACT:
This specification discloses an image taking lens system which can quickly effect focusing from an infinity object to a short-distance object. The image taking lens system disclosed in the present specification has, in succession from an object side to an image side, a first lens unit, a second lens unit, a third lens unit and a fourth lens unit. In case of focusing from the infinity object to the short-distance object, the first lens unit is not moved, but the second lens unit is moved to the image side and the third lens unit is moved to the object side. The principal point interval between the first lens unit and the second lens unit is a negative value.

REFERENCES:
patent: 4986643 (1991-01-01), Moriyama
patent: 5007720 (1991-04-01), Hamanishi
patent: 5440430 (1995-08-01), Sato
patent: 6246833 (2001-06-01), Harada
patent: 6487023 (2002-11-01), Yoneyama
patent: 2019814 (1990-01-01), None
patent: 2285313 (1990-11-01), None

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