Image pickup apparatus having lens holding unit and adjustment m

Details Image pickup apparatus having lens holding unit and adjustment m Image pickup apparatus having lens holding unit and adjustment m

1993-04-26

1999-06-22

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359686, 359683, G02B 1514

Patent

active

059148195

ABSTRACT:
An image pickup apparatus has an adjusting mechanism for zoom lens unit so that the apparatus is made compactly. The zoom lens unit is constituted by a first group having a negative refracting power, a second group having a positive refracting power, a stop, a third group having a positive refracting power and a fourth group having a negative refracting power which are sequentially arranged from the object side to be substantially symmetrical about the stop. An image forming magnification is changed by moving whole system and moving the second and third groups on an optical axis thereof while a distance between an object and the image is kept constant. Image formation characteristics of the overall lens system are adjusted by moving and/or decentering the first group and/or the fourth group on/from the optical axis.

REFERENCES:
patent: 4560242 (1985-12-01), Tokuhara et al.
patent: 4800414 (1989-01-01), Takeda
patent: 4865433 (1989-09-01), Okajima et al.
patent: 4894682 (1990-01-01), Kondo et al.
patent: 5184251 (1993-02-01), Tsuchida et al.

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