Television – Camera – system and detail – Combined image signal generator and general image signal...
Reexamination Certificate
2011-08-23
2011-08-23
Perkey, W. B. (Department: 2862)
Television
Camera, system and detail
Combined image signal generator and general image signal...
C348S345000, C359S688000
Reexamination Certificate
active
08004585
ABSTRACT:
A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20<βNT/βNW<4.50 (here, fT/fW>3.0, βNT(βNW): a composite focal length of the focusing lens unit and the negative lens unit in an infinity in-focus condition at a telephoto (wide-angle) limit when the focusing lens unit has negative optical power, or a lateral magnification of the negative lens unit at a telephoto limit in an infinity in-focus condition when the focusing lens unit has positive optical power, fT: a focal length of the entire system at a telephoto limit, fW: a focal length of the entire system at a wide-angle limit.
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Imaoka Takuya
Miyazaki Kyoichi
Sampei Masaki
Yamada Katsu
Panasonic Corporation
Pearne & Gordon LLP
Perkey W. B.
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