Hidden-mark observing apparatus and hidden-mark observable lens-

Details Hidden-mark observing apparatus and hidden-mark observable lens- Hidden-mark observing apparatus and hidden-mark observable lens-

1997-09-03

1999-02-02

Pham, Hoa Q.

Optics: measuring and testing

Lens or reflective image former testing

For optical transfer function

356127, G01B 900

Patent

active

058672591

ABSTRACT:
A progressive power lens (L) is illuminated with a collimated light beam through an illuminating optical system (2) comprising an LED (5), a pinhole plate (6), and a collimator lens (7). The shadow of the hidden mark of the progressive power lens (L) is projected onto a screen (4) by the light beam transmitted through the progressive power lens (L).

REFERENCES:
patent: 4564291 (1986-01-01), Yoshino et al.
patent: 4641964 (1987-02-01), Mitani et al.
patent: 5100232 (1992-03-01), Smith et al.
patent: 5396324 (1995-03-01), Kurachi et al.
patent: 5719668 (1998-02-01), Oana et al.

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