Patent US4669813A successfully refreshed from Google Patents.
US4669813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Faceplate incorporating an off-axis filter
Assignee: INCOM Inc A CORP OF
•
Filing: 1984-08-01
•
Granted: 1987-06-02
•
Expires: 2004-08-01
Abstract
Abstract A faceplate for a highly sensitive low-light level imaging device is provided with an off-axis light filter to reduce optical noise. A transparent optical conduit layer includes an absorbing region around the periphery to absorb off-axis light. A transparent front plate extends beyond the periphery of the conduit and forms a shoulder of easily polished glass to facilitate the sealing of the faceplate to the imaging device frame. A clear glass back plate extends so as to cover the entire inner surface of the conduit including the absorbing region, thereby providing an easily and consistently polishable surface upon which to bond a photosensitive semi-conductor wafer. This reduces the necessity for matching of glass compositions between the core and the absorbing region. The absorbing region may be a toroidal area of black glass or it may be composed of a matrix of glass having the same composition as the rest of the faceplate but having absorbing glass fibers embedded more or less radially of the axis of the conduit. In the latter case the need for glass matching is virtually eliminated.
Inventors
- 👤 Richard V. Jeskey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:05
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J2229/00; H01J2229/89; H01J2229/8909
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
An optical faceplate incorporating an off-axis filter, the faceplate comprising: a. a conduit layer having a clear glass core and a peripheral absorbing region, and b. a clear glass front plate joined to the conduit layer, having an essentially non-reflective, non-refractive interface with the core of the conduit, and extending beyond the peripheral absorbing region to form a clear glass shoulder.
Claim 2
Dependent Claim
61 words
An optical faceplate incorporating an off-axis filter, the faceplate comprising: a. a conduit layer having a clear glass core and a peripheral absorbing region, and b. a clear glass front plate joined to the conduit layer, having an essentially non-reflective, non-refractive interface with the core of the conduit, and extending beyond the peripheral absorbing region to form a clear glass shoulder.
Claim 3
Dependent Claim
52 words
An optical faceplate as recited in claim 1, further comprising: c. a clear glass back plate joined to the conduit layer, having an essentially non-reflecting, non-refracting interface with the core of the conduit, and co-extensive with the conduit as a whole, whereby an inner detecting surface is formed, of uniformly clear glass.
Claim 4
Dependent Claim
38 words
An optical faceplate as recited in claim 2, wherein: a. said absorbing region comprises a matrix of clear glass having a plurality of absorbing fibers embedded therein, the fibers extending generally radially of the axis of the conduit.
Claim 5
Dependent Claim
54 words
An optical imaging device, comprising: a. a frame having a light-admitting aperture, b. an optical faceplate as recited in claim 2 sealed across the aperture, the faceplate having a photosensitive detecting wafer sealed to the inner detecting surface, and c. means for processing any image detecting by the wafer in response to admitted light.
Claim 6
Dependent Claim
37 words
An optical faceplate as recited in claim 1, wherein: said absorbing region comprises a matrix of clear glass having a plurality of absorbing fibers embedded therein, the fibers extending generally radially of the axis of the conduit.
Claim 7
Dependent Claim
82 words
An optical faceplate incorporating an off-axis filter, the faceplate comprising: a. a conduit layer having a clear glass core, an interface and a peripheral absorbing region, and b. a clear glass back plate joined to the conduit layer, having an essentially non-reflecting, non-refracting interface with the core of the conduit, the clear glass back plate extending beyond the interface between the clear glass core and the peripheral absorbing region, whereby an inner detecting surface is formed, of uniformly clear and polishable glass.
Claim 8
Dependent Claim
82 words
An optical faceplate incorporating an off-axis filter, the faceplate comprising: a. a conduit layer having a clear glass core, an interface and a peripheral absorbing region, and b. a clear glass back plate joined to the conduit layer, having an essentially non-reflecting, non-refracting interface with the core of the conduit, the clear glass back plate extending beyond the interface between the clear glass core and the peripheral absorbing region, whereby an inner detecting surface is formed, of uniformly clear and polishable glass.
Claim 9
Dependent Claim
37 words
An optical faceplate as recited in claim 6, wherein: said absorbing region comprises a matrix of clear glass having a plurality of absorbing fibers embedded therein, the fibers extending generally radially of the axis of the conduit.
References Cited (Backward Citations)
US532969A
Cited
US3335310A
Cited
US3549233A
Cited
US3797910A
Cited
USB532969I5
Cited
FR2477288A1
Cited
US4344668A
Cited
US4406973A
Cited
US4475059A
Cited
US4533210A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |