Appeal 2007-2680
Application 10/756,352
between the center aperture and the coated periphery, and the peripheral
coating protects the adhesive holding the optical element in its holder from
UV light (Specification ¶ [0007]).
Claims 1 and 26 are illustrative:
1. A method comprising:
(a) holding an optical element comprised of calcium
fluoride so that a ring-shaped, peripheral portion of a face surface of
incidence of the optical element is covered and a circular, central
portion of the surface of the optical element is exposed;
(b) providing a first coating on the central portion of the
face surface of incidence of the optical element;
(c) releasing the optical element from being held;
(d) providing a second coating over the central and
peripheral portions of the face surface of incidence of the optical
element; and
(e) substantially completely removing the first and
second coatings from the central portion of the face surface of
incidence of the optical element, whereby the central portion of the
face surface of incidence forms a clear aperture.
26. A method, comprising:
(a) masking an optical element made from calcium
fluoride so that a peripheral portion of a face surface of incidence of
the optical element is covered and a central portion of the face surface
of incidence of the optical element is exposed;
(b) providing a first coating on the central portion of the
face surface of incidence of the optical element;
(c) unmasking the optical element;
2
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