US4701019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective application of light-absorbing particles to a lenticular screen
Assignee: Philips North America LLC
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Filing: 1986-12-05
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Granted: 1987-10-20
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Expires: 2006-12-05
Abstract
Abstract Light-absorbing particles are selectively applied to a lenticular light-transmissive screen, such as a projection television screen. The particles are selectively deposited in grooves between lenticules of the screen by filling the grooves to a predetermined depth with a slurry comprising a mixture of a volatile liquid and the light-absorbing particles. Microwave radiation is applied to the screen with the deposited particles, to effect evaporation of any unevaporated liquid and fusing of the particles to each other and to the screen.
Inventors
- 👤 Brian J. Fitzpatrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:58
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56; G03B21/60; G03B21/62; G03B21/625; B; B05; B05D; B05D1/00; B05D1/02; B05D1/04; B05D1/06; B05D3/00; B05D3/02; B05D3/0254; B05D3/029; B05D2401/00; B05D2401/30; B05D2401/32
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
In a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, the improvement comprising a multiplicity of light-absorbing particles filling each groove to a predefined depth, said particles having a substantially higher microwave absorption coefficient than the screen material, and having heat-fusible outer surfaces which are microwave-fused to each other and to the screen, thereby affixing the particles in the grooves.
Claim 2
Dependent Claim
77 words
In a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, the improvement comprising a multiplicity of light-absorbing particles filling each groove to a predefined depth, said particles having a substantially higher microwave absorption coefficient than the screen material, and having heat-fusible outer surfaces which are microwave-fused to each other and to the screen, thereby affixing the particles in the grooves.
Claim 3
Dependent Claim
29 words
A light-transmissive screen as in claim 1 where the particles consist essentially of an inner material having a high microwave absorption coefficient, surrounded by an outer, heat-fusible, light-absorbing material.
Claim 4
Dependent Claim
19 words
A screen as in claim 1 or 2 where the particles have a nominal diameter of approximately 75 microns.
Claim 5
Independent Claim
114 words
A method for selectively applying light-absorbing particles to a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, said method comprising the steps of: (a) filling the grooves to a predetermined depth with a slurry comprising a mixture of a volatile liquid and light-absorbing particles having a substantially higher microwave absorption coefficient than the screen material and having heat-fusible outer surfaces; and (b) transfusing the screen and the particles in the grooves with microwave radiation of sufficient energy to fuse the particles to each other and to the screen, but of insufficient energy to optically distort the screen.
Claim 6
Independent Claim
114 words
A method for selectively applying light-absorbing particles to a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, said method comprising the steps of: (a) filling the grooves to a predetermined depth with a slurry comprising a mixture of a volatile liquid and light-absorbing particles having a substantially higher microwave absorption coefficient than the screen material and having heat-fusible outer surfaces; and (b) transfusing the screen and the particles in the grooves with microwave radiation of sufficient energy to fuse the particles to each other and to the screen, but of insufficient energy to optically distort the screen.
Claim 7
Dependent Claim
40 words
A method as in claim 4 where the grooves are filled to a predetermined depth with the slurry by covering the entire screen surface with the slurry and then wiping the slurry from at least the peaks of the lenticules.
Claim 8
Independent Claim
143 words
A method for selectively applying light-absorbing particles to a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, said method comprising the steps of: (a) depositing at an end of the screen a slurry comprising a mixture of a volatile liquid and light-absorbing particles having a substantially higher microwave absorption coefficient than the screen material and having heat-fusible outer surfaces; (b) spreading the slurry across the screen by means of a wiping member which is shaped to effect removal of the slurry from at least the peaks of the lenticules; and (c) transfusing the screen and the particles in the grooves with microwave radiation of sufficient energy to fuse the particles to each other and to the screen, but of insufficient energy to optically distort the screen.
Claim 9
Independent Claim
143 words
A method for selectively applying light-absorbing particles to a light-transmissive screen having a surface contoured to include a multiplicity of raised lenticules having respective peaks and sidewalls, said sidewalls defining grooves between the lenticules, said method comprising the steps of: (a) depositing at an end of the screen a slurry comprising a mixture of a volatile liquid and light-absorbing particles having a substantially higher microwave absorption coefficient than the screen material and having heat-fusible outer surfaces; (b) spreading the slurry across the screen by means of a wiping member which is shaped to effect removal of the slurry from at least the peaks of the lenticules; and (c) transfusing the screen and the particles in the grooves with microwave radiation of sufficient energy to fuse the particles to each other and to the screen, but of insufficient energy to optically distort the screen.
Claim 10
Dependent Claim
22 words
A method as in claim 4, 5, or 6 where the microwave radiation effects evaporation of the liquid portion of the slurry.
Claim 11
Dependent Claim
18 words
A method as in claim 4, 5 or 6 where the volatile liquid consists essentially of an alcohol.
Claim 12
Dependent Claim
15 words
A method as in claim 8 where the volatile liquid consists essentially of isopropyl alcohol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |