Variable focal length optical system having a constant diameter

Details Variable focal length optical system having a constant diameter Variable focal length optical system having a constant diameter

1986-05-14

1987-11-10

Henry, Jon W.

Electric heating

Microwave heating

Tunnel furnace

350415, 350453, 350462, 350474, 350518, 350523, 350563, 350501, 219121LS, 219121LR, 219121LU, 362259, G02B 916, G02B 2700

Patent

active

047053674

ABSTRACT:
An optical system for moving a focal point along an axis employs an input telescope having a variable lens separation and a fixed field lens separated from the telescope by the sum of the focal lengths of the field lens and the second lens of the telescope. The focal spot maintains a constant size as it moves. If two input beams are used, the crossing angle of the beams remains constant.

REFERENCES:
patent: 1095285 (1914-05-01), Oliver
patent: 4209225 (1980-06-01), Abe et al.
patent: 4318585 (1982-03-01), Matsumura
patent: 4505554 (1985-03-01), DeHubry
patent: 4526443 (1985-07-01), Hirose

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