Bar skiascope beam fixable in parallel

Details Bar skiascope beam fixable in parallel Bar skiascope beam fixable in parallel

1997-06-06

1999-01-12

Dang, Hung X.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351216, A61B 310

Patent

active

058596879

ABSTRACT:
A bar skiascope that has lens slide for displacing a condenser lens along a direction of a light beam also includes a stop slide that can be displaced up to a predetermined maximum position in a displacement path of the lens slide, wherein the condenser lens is located precisely in a position for producing a substantially parallel beam, when the stop slide is in the maximum position, and a stop slide stop element, belonging to the stop slide, and a lens slide stop element, belonging to the lens slide, come into contact with each other.

REFERENCES:
patent: 2501438 (1950-03-01), Copeland
patent: 3602581 (1971-08-01), Heine
patent: 5650839 (1997-07-01), Sims
Rassow, Bernhard; Ophthalmologisch-optische Instrumente, Ferdinand Enke Verlag Stuttgart, 1987, S. 36-41.

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