Joystick override control for an ophthalmic instrument

Details Joystick override control for an ophthalmic instrument Joystick override control for an ophthalmic instrument

1994-10-28

1996-12-24

Dang, Hung Yuan

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351209, A61B 314, A61B 310

Patent

active

055877486

ABSTRACT:
An alignment override control for effecting automatic vertical alignment of a test axis of an ophthalmic instrument with the center of an eye is disclosed. The test axis is associated with optical alignment means of the instrument vertically movable by an elevation motor controlled by a motor drive. A joystick and a pair of directional switches are connected to the motor drive for manual positioning of the test axis. When the eye comes within a field of view defined by the optical means, the override control disconnects the switches and automatically signals the elevation motor to effect automatic alignment using signal information originating from the optical means.

REFERENCES:
patent: 4881807 (1989-11-01), Luce et al.
patent: 5337095 (1994-08-01), Katsuragi et al.

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