Optics: measuring and testing – Lens or reflective image former testing – Optical center – cylinder axis – or prism measuring or...
Patent
1986-09-15
1989-01-24
Evans, F. L.
Optics: measuring and testing
Lens or reflective image former testing
Optical center, cylinder axis, or prism measuring or...
350252, G01B 900
Patent
active
047997931
ABSTRACT:
There is disclosed a method and apparatus for providing spectacle correction on axis in a compound lens system. A lensometer having a lens stop assembly is used in conjunction with a collet fixture for positioning a lens and for aligning the lens in a compound lens system while employing the lensometer to enable optical alignment. The method operates by placing the lens in the fixture to firmly hold the lens and allowing the lens to protrude from the fixture. The fixture is then placed over the lens stop assembly of the lensometer and the compound lens system is then held against the lens as emplaced on the lens stop. By rotating the fixture, one can align the lenses on axis and determine the proper position of the lens in the compound system. The collet fixture which includes an inner tubular section having an open top and an open bottom. The tubular section is symmetrically disposed about an axis with the open top having a series of slots. The slots form a series of flanges and the slots extend over the surface of the inner member and intersect a threaded portion of the same. The outer peripheral edges of the flanges define a lens accommodating aperture. A rotatable ring which has an internal thread is then positioned over the threaded section of the tubular member and when rotated varies the spacing between slots thereby adjusting the effective diameter of the lens accommodating aperture to thereby hold the lens in a firm position while allowing a substantial portion of the lens to protrude to enable placement within a telescopic lens assembly while assuring optical alignment proper magnification of the total assembly.
REFERENCES:
patent: 1383678 (1920-09-01), Tillyer et al.
patent: 2259006 (1939-10-01), Simmons
patent: 2897722 (1953-11-01), Gunter et al.
patent: 3542476 (1970-11-01), Nord
patent: 4364645 (1982-12-01), Feinbloom
patent: 4516787 (1985-05-01), Venable
Designs for Vision Inc.
Evans F. L.
Plevy Arthur L.
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