Patent US4657360A successfully refreshed from Google Patents.
US4657360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for making an annular beam
Assignee: Canon Inc
•
Filing: 1985-02-01
•
Granted: 1987-04-14
•
Expires: 2005-02-01
Abstract
Abstract An optical system for making an annular beam comprises a first member supporting a convex reflecting surface for reflecting an incident beam and having a first tapered surface, and a second member having a second tapered surface bearing against the first tapered surface and supporting a concave reflecting surface in a predetermined positional relation relative to the convex reflecting surface so as to reflect the beam reflected by the convex reflecting surface and make it into an annular beam.
Inventors
- 👤 Kazuhiro Izukawa
- 👤 Ichiro Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:37
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/001; G02B19/00; G02B19/0004; G02B19/0019; G02B19/0023; G02B19/0033; G11; G11B; G11B7/00; G11B7/08; G11B7/085; G11B7/08547; G11B7/12; G11B7/135; G11B7/1381
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An optical system for making an annular beam, comprising: a first member supporting a convex reflecting surface for reflecting an incident beam and having a first tapered surface; and a second member having a second tapered surface bearing against said first tapered surface and supporting a concave reflecting surface in an opposed relation relative to said convex reflecting surface so as to reflect the beam reflected by said convex reflecting surface and make it into an annular beam.
Claim 2
Dependent Claim
78 words
An optical system for making an annular beam, comprising: a first member supporting a convex reflecting surface for reflecting an incident beam and having a first tapered surface; and a second member having a second tapered surface bearing against said first tapered surface and supporting a concave reflecting surface in an opposed relation relative to said convex reflecting surface so as to reflect the beam reflected by said convex reflecting surface and make it into an annular beam.
Claim 3
Dependent Claim
25 words
An optical system according to claim 1, wherein said convex reflecting surface and said first tapered surface form different portions of the same conical shape.
Claim 4
Dependent Claim
25 words
An optical system according to claim 1, wherein said concave reflecting surface and said second tapered surface form different portions of the same conical shape.
Claim 5
Dependent Claim
24 words
An optical system according to claim 1, wherein each of said first and second tapered surfaces has at least a part of conical shape.
References Cited (Backward Citations)
US2891437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |