Optical: systems and elements – Compound lens system – Telescope
Reexamination Certificate
2005-08-09
2005-08-09
Nguyen, Thong Q (Department: 2872)
Optical: systems and elements
Compound lens system
Telescope
C359S399000, C359S427000, C396S382000
Reexamination Certificate
active
06927907
ABSTRACT:
A reference plate is situated on an optical axis of an eyepiece. The reference plate includes a first glass plate and a second glass plate. One surface of the first glass plate and one surface of the second glass plate are bonded. Cross hairs are formed on the bonded surface of the first glass plate by using a chromium plating and so on. A radius of curvature of the bonded surface accords with the field curvature of the sagittal image surface of the eyepiece.
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English Language Abstract FR2240461.
Greenblum & Bernstein P.L.C.
Nguyen Thong Q
PENTAX Corporation
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