Zoom lens of the inner focus type

Details Zoom lens of the inner focus type Zoom lens of the inner focus type

1997-05-12

1998-04-28

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359686, G02B 1514

Patent

active

057453004

ABSTRACT:
A zoom lens is disclosed comprising, from front to rear a first lens unit of positive refractive power, a second lens unit of negative refractive power for varying the focal length, a third lens unit for compensating for the image shift with zooming, and a fourth lens unit having the image forming function and stationary during zooming, wherein the first lens unit is divided into two or three lens subunits, one of which is moved to effect focusing, and various rules of design are set forth to suppress well the variation of aberrations with focusing.

REFERENCES:
patent: 4848883 (1989-07-01), Maruyama
patent: 5097360 (1992-03-01), Fukami et al.
patent: 5136431 (1992-08-01), Terasawa et al.
patent: 5191475 (1993-03-01), Terasawa et al.
patent: 5309284 (1994-05-01), Nakatsuji

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