Patent US4185902A successfully refreshed from Google Patents.
US4185902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light absorption device for the prevention of stray light in particular in a phototypesetter
Assignee: Linotype Co Ltd
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Filing: 1978-06-02
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Granted: 1980-01-29
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Expires: 1998-06-02
Abstract
Abstract A phototypesetter has an optical path including a beam splitter intersecting the main light path and an auxiliary light path for reflecting the auxiliary light path into the main light path. An absorption element with a concave front surface is mounted behind the beam splitter to absorb the non-reflected light from the auxiliary beam. Additionally, the concave surface directs the nonabsorbed light to a light absorbent body.
Inventors
- 👤 Michael Plaot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:15
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/003; B; B41; B41B; B41B21/00; B41B21/16; G02B5/20; G02B5/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
An absorption device for use in a light ray projection system of a phototypesetter, having a primary ray and a secondary ray projection and wherein the secondary ray is directed into the primary ray with a partially translucent and partially reflecting surface, said surface being arranged within the path of said primary ray and said secondary ray projection, and including an absorption body disposed in an extension of the secondary ray projection from the backside of said partially reflecting and partially translucent surface, said absorption body arranged to absorb radiation of said secondary ray, said absorption body having a concave surface arranged to direct said secondary ray at an angle relative to the direction of the secondary ray projection and at a focal point, and black body means for absorbing light placed at the focal point for absorbing light from said concave surface.
Claim 2
Dependent Claim
143 words
An absorption device for use in a light ray projection system of a phototypesetter, having a primary ray and a secondary ray projection and wherein the secondary ray is directed into the primary ray with a partially translucent and partially reflecting surface, said surface being arranged within the path of said primary ray and said secondary ray projection, and including an absorption body disposed in an extension of the secondary ray projection from the backside of said partially reflecting and partially translucent surface, said absorption body arranged to absorb radiation of said secondary ray, said absorption body having a concave surface arranged to direct said secondary ray at an angle relative to the direction of the secondary ray projection and at a focal point, and black body means for absorbing light placed at the focal point for absorbing light from said concave surface.
References Cited (Backward Citations)
SU361901A1
Cited
US3984157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-28 | 1983-07-30 | 1984-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-28 | 1987-07-30 | 1988-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-28 | 1991-07-30 | 1992-01-29 | $7700.00 | Window Closed / Lapsed |