Light projector device, particularly for eyesight examination te

Details Light projector device, particularly for eyesight examination te Light projector device, particularly for eyesight examination te

1974-06-24

1976-03-30

Sacher, Paul A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Folding

353103, A61B 302, G03B 2310

Patent

active

039470989

ABSTRACT:
A light projector device for projecting eyesight examination tests onto a screen comprises a test disc and a mask disc mounted one in front of the other with their peripheral regions in the path of a light beam from a light projection unit. The discs are rotatable by independent motors and the test disc has on its periphery a series of translucent areas carrying tests while the mask disc has a series of light passages capable of being superimposed on the test areas of the test disc in the light beam. A test carrier dial is adapted for rotation in the light beam about an axis co-axial with the optical axis of the projection unit, and this test carrier dial and the test disc are both mounted on a plate which is adapted to rock between two end positions. In one end position of the plate, the test disc is in engagement with drive means driven by the motor associated with the test disc, the periphery of the test disc is situated in the light beam and the test dial is situated at a distance from the beam, and in the other end position the test dial is engaged with the same drive means and is situated in the light beam, and the test disc is located at a distance from the beam. Thus a single motor is sufficient for the controlled independent rotation of both the test disc and the test dial.

REFERENCES:
patent: 1797544 (1931-03-01), Cameron
patent: 3655276 (1972-04-01), Wilkinson

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