Anti-reflection film and microscope having optical element...

Details Anti-reflection film and microscope having optical element... Anti-reflection film and microscope having optical element...

2006-10-24

2006-10-24

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Compound lens system

With image recorder

C359S368000

Reexamination Certificate

active

07126751

ABSTRACT:
A microscope includes an optical element provided with an anti-reflection film applied thereto. The anti-reflection film has the following layered structure:having first to sixth layers of films, in order from the surface of the optical element, formed of a high-refractive-index material for each of the first, third and fifth layers, a low-refractive-index material or a middle-refractive-index material for each of the second and fourth layers, and a low-refractive-index material for the sixth layer, with a range of the optical film-thickness nd of each layer in reference to the design wavelength λ being “(0.13˜0.35)×λ/4” for the first layer, “(0.18˜0.75)×λ/4” for the second layer, “(0.28˜2.31)×λ/4” for the third layer, “(0.26˜0.92)×λ/4” for the fourth layer, “(0.20˜0.37)×λ/4” for the fifth layer, and “(1.09˜1.18)×λ/4” for the sixth layer.

REFERENCES:
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patent: 5067805 (1991-11-01), Corle et al.
patent: 6819498 (2004-11-01), Watanabe et al.
patent: 2002/0074658 (2002-06-01), Mochizuki
patent: 2005/0201422 (2005-09-01), Ohta et al.

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