Tachistoscopic focus control

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding

Patent

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Details

350187, A61B 302, G02B 1500

Patent

active

041165470

ABSTRACT:
Apparatus for the tachistoscopic projection of an image of projectable material. The apparatus includes a supporting structure and a light source. A lens mechanism is on the supporting structure optically aligned with the light source. The supporting structure is adapted to support the projectable material between the light source and the lens structure. The apparatus is designed for effecting relative displacement of the lens structure and the support holding the projectable material so as to bring the projected image into focus for a controlled viewing time and then out of focus while the material to be projected is retained stationary in projection position. A cam arrangement is employed which includes a cam surface and a cam follower. A manual actuator is on the lens structure to rotate the lens structure for relative movement between the cam follower and the cam surface and to bring the projected image into and out of focus. The manual actuator is a handle removably attached to the lens structure and manually rotatable to a first position and releasable to rotate to a second position so as to bring the projected image into and out of focus. Finally, the rotational movement between the cam surface and the cam follower causes the one mounted on the lens structure to axially shift the lens structure and accomplish the focusing action for the projected image.

REFERENCES:
patent: 2501219 (1950-03-01), Hopkins et al.
patent: 2723591 (1955-11-01), Taylor
patent: 3093029 (1973-06-01), Johannsen et al.
patent: 3906529 (1975-09-01), Filipovich

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