Variable focal position optical system and light beam scanning a

Details Variable focal position optical system and light beam scanning a Variable focal position optical system and light beam scanning a

1996-12-04

1997-12-09

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave directional modulation

359784, 359316, 2502012, 2502015, G02F 129

Patent

active

056966229

ABSTRACT:
A variable focal position optical system which includes a variable focal length lens subsystem whose focal length is variable and a fixed focal length lens subsystem whose focal length is fixed. The variable focal length lens subsystem and the fixed focal length lens subsystem are arranged such that a distance between a principal point of the variable focal length lens subsystem and a principal point of the fixed focal length lens subsystem at a variable focal length lens subsystem side is substantially equal to the focal length of the fixed focal length lens subsystem. As a result, it is possible to change only a focal position with substantially no change to a beam diameter at the focal position.

REFERENCES:
patent: 4124273 (1978-11-01), Huignard et al.
patent: 4466703 (1984-08-01), Nishimoto
patent: 5033806 (1991-07-01), Tomita et al.

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