Slit projection apparatus

Details Slit projection apparatus Slit projection apparatus

1988-01-19

1990-01-16

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, A61B 310

Patent

active

048946702

ABSTRACT:
A slit projection apparatus has slit light beam forming means and a projection optical system for projecting a slit image onto an object to be examined. The projection optical system is provided with a light deflecting member rotatable so as to form a predetermined elevation angle, and a lens system having a predetermined focal length corresponding to the angle of rotation of the light deflecting member so as to compensate for the optical path difference conforming to said angle of rotation and including a lens having at least a portion thereof movable in the direction of the optic axis while keeping a predetermined spacing with respect to the light deflecting member.

REFERENCES:
patent: 3433560 (1969-03-01), Gambs
patent: 3535027 (1970-10-01), Littmann et al.
patent: 3944343 (1976-03-01), Mueller

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