Portable device for ensuring that a center thickness of a lens i

Details Portable device for ensuring that a center thickness of a lens i Portable device for ensuring that a center thickness of a lens i

1995-10-17

1997-10-07

Pham, Hoa Q.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356381, G01B 900

Patent

active

056754060

ABSTRACT:
A portable lens measuring device (10) comprises a plurality of optical fibers (23) and a lamp (18) for providing light to a common end. The portable lens measuring device (10) includes a sensor (32) for detecting light from the common end through the second arm, the light sensor (32) generating a signal responsive to the amount of light detected, and a lens assembly (25), the lens assembly being connected to the common end and having a fixed focal point. The portable lens measuring device (10) includes a controller (12) for controlling the lens assembly (25), for regulating the lamp and for receiving the signal generated by the detector. The portable lens measuring device (10) also includes a sensor motor (14) for moving the lens assembly (25) across a first and second surfaces of the lens to provide a value of the center thickness of the lens. The controller (14) of the portable lens measuring device stores the value of the center thickness, compares the value of the center thickness to a reference value, and determines if the difference between the value of the center thickness and the reference value is within a predetermined threshold.

REFERENCES:
patent: 3619067 (1971-11-01), Howland
patent: 3804523 (1974-04-01), McCormack
patent: 4072428 (1978-02-01), Moss
patent: 4209252 (1980-06-01), Arditty et al.
patent: 4359282 (1982-11-01), Garrison
patent: 4564296 (1986-01-01), Oshida et al.
patent: 5483347 (1996-01-01), Hollmann

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