Optometric apparatus

Details Optometric apparatus Optometric apparatus

2006-12-05

2006-12-05

Marmor, II, Charles A (Department: 3735)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

C351S234000, C351S235000, C351S216000, C351S217000

Reexamination Certificate

active

07144112

ABSTRACT:
An optometric apparatus (2) includes a rotary prism (136a,136b) disposed in front of the eye (E), for adding a prism degree to the eye (E); a rotation device including a pulse motor (181, 184) and a rotation transmitting mechanism (146, 147, 176, 176a, 177, 177a, 178, 179, 182, 183, 185, 186) for transmitting rotation of the pulse motor to the rotary prism, the rotation device being adapted for rotating the rotary prism to change the prism degree; a command device (43a,43b) for generating a command signal to start and stop the rotation of the rotary prism; and a control unit (60) for controlling the rotation device to drive the pulse motor to rotate at a speed of 5 pulses/sec. or more when the control unit receives the rotation start command signal until when receives the rotation stop command signal, and, to change the prism degree at a speed of 0.1 to 1.0 prism/sec.

REFERENCES:
patent: 3891311 (1975-06-01), Fletcher et al.
patent: 4496226 (1985-01-01), Augusto et al.
patent: 6048064 (2000-04-01), Hosoi et al.
patent: 90 05 493 (1990-10-01), None
patent: 0 070 333 (1983-01-01), None
patent: 0 502 413 (1992-09-01), None
patent: A 64-20824 (1989-01-01), None

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