Telephoto lens and telephoto lens apparatus having the same

Details Telephoto lens and telephoto lens apparatus having the same Telephoto lens and telephoto lens apparatus having the same

2005-08-09

2005-08-09

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Telephoto

C359S684000, C359S686000, C359S679000, C359S773000

Reexamination Certificate

active

06927926

ABSTRACT:
A telephoto lens includes, in order from the object side, a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, a third lens unit having a positive refracting power, and a fourth lens unit having a negative refracting power. The second lens unit has a cemented lens composed of a positive lens and a negative lens, and a negative lens. The fourth lens unit has a cemented lens composed of a negative lens and a positive lens, and a negative lens. The telephoto lens satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?νd>80in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.5>f4/f>−1.2in-line-formulae description="In-line Formulae" end="tail"?where νdis an Abbe's number of a lens having a positive refracting power in the first lens unit, f4is a focal length of the fourth lens unit, and f is a focal length of the entire optical system.

REFERENCES:
patent: 4348084 (1982-09-01), Kitagishi et al.
patent: 6359739 (2002-03-01), Sensui
patent: 61-215513 (1986-09-01), None
patent: 01-237611 (1989-09-01), None
patent: 03-278012 (1991-12-01), None
patent: 2000-089103 (2000-03-01), None

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