Zoom lens assembly

Details Zoom lens assembly Zoom lens assembly

1985-08-22

1988-06-14

Arnold, Bruce Y.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250231SE, G02B 704

Patent

active

047508213

ABSTRACT:
A zoom lens optical system having the focusing provision at a rear zoom component with an automatic mechanism for varying its axial position as a function of the focal length of the entire system with an object at a constant distance. The automatic mechanism includes a motor whose stator and rotor are formed to hollow cylindrical shapes and a device for producing a driving signal for the motor with the power density thereof varying with the variation of the focal length.

REFERENCES:
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4275952 (1981-06-01), Uesugi
patent: 4342025 (1982-07-01), Spalti et al.
patent: 4422065 (1983-12-01), Radomirov et al.
patent: 4465928 (1984-08-01), Breslow
patent: 4605286 (1986-08-01), Sumi

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