US4682853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission projection screen and method of manufacturing same
Assignee: US Philips Corp
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Filing: 1986-03-26
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Granted: 1987-07-28
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Expires: 2006-03-26
Abstract
Abstract The invention relates to a transmission projection screen having a high light output and a suitable contrast, for example, for use in a projection-television system, and a method of manufacturing such a screen. The projection screen comprises a transparent substrate having a front surface which is provided with mutually parallel ribs. Light-absorbing glass fibers 10 are provided at the bottom of the grooves 24 between the ribs 22, and they are fixed by means of a hot-melt adhesive layer 11.
Inventors
- 👤 Dirk J. Broer
- 👤 Renso J. M. Zwiers
- 👤 Cornelis M. G. Jochem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:35
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
54 words
A transmission projection screen comprising a transparent substrate having a front surface which is provided with mutually parallel ribs from which light issues during operation of the screen, grooves being present between the successive ribs, in which grooves light-absorbing thread-like elements are disposed, characterized in that the light-absorbing elements are made from glass fibres.
Claim 2
Dependent Claim
54 words
A transmission projection screen comprising a transparent substrate having a front surface which is provided with mutually parallel ribs from which light issues during operation of the screen, grooves being present between the successive ribs, in which grooves light-absorbing thread-like elements are disposed, characterized in that the light-absorbing elements are made from glass fibres.
Claim 3
Dependent Claim
19 words
A transmission projection screen as claimed in claim 1, characterized in that the glass fibres consist of black glass.
Claim 4
Dependent Claim
71 words
A method of manufacturing a transmission projection screen as claimed in claim 1 or 2, characterized in that the method comprises the following steps: a light-absorbing glass fibre is covered with a synthetic resin cladding, synthetic resin cladded glass fibres are disposed in the grooves of the screen, the screen including the glass fibres is subjected to a treatment such that the synthetic-resin cladding adheres to the walls of the grooves.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, characterized in that the treatment to make the synthetic resin cladding adhere is a heat treatment.
Claim 6
Dependent Claim
48 words
A transmission projection screen, comprising a transparent substrate having a surface having a plurality of ribs separated by grooves; and a multiplicity of glass fibers each having a predetermined cross-section and a predetermined color disposed in said plurality of grooves for absorbing ambient light falling on said screen.
Claim 7
Dependent Claim
48 words
A transmission projection screen, comprising a transparent substrate having a surface having a plurality of ribs separated by grooves; and a multiplicity of glass fibers each having a predetermined cross-section and a predetermined color disposed in said plurality of grooves for absorbing ambient light falling on said screen.
Claim 8
Dependent Claim
15 words
A transmission projection screen as claimed in claim 5, wherein said predetermined color is black.
Claim 9
Dependent Claim
14 words
A transmission projection screen as claimed in claim 5, wherein said cross-section is circular.
Claim 10
Dependent Claim
23 words
A transmission projection screen as claimed in claim 5, further comprising a coating covering at least part of each of said glass fibers.
Claim 11
Dependent Claim
17 words
A transmission projection screen as claimed in claim 8, wherein said coating is a synthetic resin coating.
Claim 12
Dependent Claim
26 words
A transmission projection screen as claimed in claim 5, wherein at least one of said glass fibers is disposed in each of said plurality of grooves.
Claim 13
Dependent Claim
34 words
A transmission projection screen as claimed in claim 5, wherein said grooves are V-shaped having a narrow and a wide portion; and wherein said glass fibers have a diameter fitting into said narrow portion.
Claim 14
Independent Claim
56 words
A method for creating blackening in manufacturing a transmission projection screen having a plurality of ribs separated by grooves, comprising the steps of manufacturing a glass fiber having a predetermined color and cross-section; coating said glass fibers at least in part with an adhesive coating; and placing said glass fibers with said coating into said grooves.
Claim 15
Independent Claim
56 words
A method for creating blackening in manufacturing a transmission projection screen having a plurality of ribs separated by grooves, comprising the steps of manufacturing a glass fiber having a predetermined color and cross-section; coating said glass fibers at least in part with an adhesive coating; and placing said glass fibers with said coating into said grooves.
Claim 16
Dependent Claim
13 words
A method as claimed in claim 12, wherein said predetermind color is black.
Claim 17
Dependent Claim
49 words
A method as claimed in claim 12, wherein said coating step comprises coating said glass fibers with a synthetic resin; further comprising the step of heat treating said glass fiber with said coating after placement into said grooves thereby coating a bond between said glass fibers and said grooves.
References Cited (Backward Citations)
US4525029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |