Optics: image projectors – Lens support – Lens position adjustable
Patent
1985-06-13
1987-06-30
Frankfort, Charles
Optics: image projectors
Lens support
Lens position adjustable
353 69, 350419, G03B 310
Patent
active
046766146
ABSTRACT:
An optical apparatus for projecting a pattern on a first plane onto a second plane comprises a projection optical system disposed between the first plane and the second plane to form an imaging optical path, a structure for forming a space independent from the ambient space and filled with a gas between the first plane and the second plane in such a manner that the imaging optical path passes therethrough, the structure including a first transparent flat member perpendicular to the optic axis of the projection optical system and forming the entrance surface of the imaging light beam to the independent space and a second transparent flat member parallel to the first transparent flat member and forming the exit surface of the imaging light beam from the independent space, the gas filling the independent space having a refractive index different from the refractive index of the ambient space, and a device for regulating the distance between the first transparent flat member and the second transparent flat member and varying the thickness of the independent space in the direction of the optic axis.
REFERENCES:
patent: 2836101 (1958-05-01), De Swart
patent: 3788730 (1974-01-01), Greenleaf
patent: 3891314 (1975-06-01), Lakin et al.
patent: 4331388 (1982-05-01), McCrobie et al.
patent: 4362385 (1982-12-01), Lobach
patent: 4383757 (1983-05-01), Phillips
patent: 4420233 (1983-12-01), Nomoto et al.
patent: 4538914 (1985-09-01), Yomoda et al.
Frankfort Charles
Nippon Kogaku K. K.
Scanlon Patrick R.
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