Optics: measuring and testing – Sample – specimen – or standard holder or support
Patent
1982-04-13
1985-02-12
McGraw, Vincent P.
Optics: measuring and testing
Sample, specimen, or standard holder or support
350525, G01N 2101, G02B 2110
Patent
active
044987692
ABSTRACT:
A device for examining under conditions of lighting on a black background an object such as the surface of a spectacle lens, comprising, in a casing, a support for supporting the object to be examined, and black background lighting means including an opaque screen adapted to arrest the light rays issuing from a light source and able of penetrating directly an aperture provided in said support, as well as reflecting and/or concentrating means adapted to reflect laterally the light beams issuing from said light source, which are transmitted to said object through said aperture, said light source being disposed in a fixed position determined with reference to the periphery of said opaque screen, wherein said casing comprises a mounting opening which opens into an opening of said reflecting means and allows said light source supported by said screen on the side opposite to the aperture of the support to be easily mounted in position.
REFERENCES:
patent: 1999240 (1935-04-01), Kraft et al.
patent: 2332668 (1943-10-01), Richards
patent: 3652169 (1972-03-01), Danti et al.
patent: 3920311 (1975-11-01), Tsuda et al.
patent: 4194814 (1980-03-01), Fischer et al.
Essilor International
McGraw Vincent P.
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