Optics: measuring and testing – Lens or reflective image former testing – Optical center – cylinder axis – or prism measuring or...
Patent
1974-10-30
1976-09-21
Corbin, John K.
Optics: measuring and testing
Lens or reflective image former testing
Optical center, cylinder axis, or prism measuring or...
356125, G01B 900
Patent
active
039815897
ABSTRACT:
A device for automatically measuring the spherical power, cylindrical axis and power and prism of an ophthalmic lense, with each determined independently of each other without a servo system. At least two LEDs act as point-sources of light, as Scheiner apertures. The light from the LEDs pass through an objective lense, thence through a selectively translatable aperture target, and then pass through a collimating lense. The LED rays then pass through the lens under study, and the target images are focused by a telescope objective lens onto a light sensitive detector. The detector which is selectively rotatable in concert with the LEDs is partitioned into Cartesian quadrants. Rotation of the detector and LEDs until the target images fall on the major detector axis discloses the axis of the cylinder of the lens being measured independent of lens power. Translation of the target until the target images maximally coincide reveals the power of the lens in its principal meridian. The LEDs are driven by a square wave, and a unique electronic circuit reads the quadrant sensitive detector to detect major axis and maximum coincidence.
REFERENCES:
patent: 1873526 (1932-08-01), Allen
patent: 3473067 (1969-10-01), Rittmayer
patent: 3832066 (1974-08-01), Cornsweet
Corbin John K.
Optical Sciences Group
Rosenberger Richard A.
Zimmerman Harris
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