US4792209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection screen
Assignee: Individual
•
Filing: 1987-06-01
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Granted: 1988-12-20
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Expires: 2007-06-01
Abstract
Abstract A slide projection screen is disclosed which is designed to facilitate video recording of projected images. To accommodate for varied light intensity levels, the screen resulting from the optic projection by a slide projector, a compensating layer is provided on the screen. The compensating layer is made by preparing a master film image corresponding to the average light intensity pattern from a slide projector and using the master film image to expose a photo emulsion layer on the screen being made. Certain embodiments include a light absorbing layer to compensate for light scattering halation effects.
Inventors
- 👤 Curtis S. Laine
- 👤 Ronald G. Dow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:22
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/54; G03B21/56
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
57 words
Projection screen apparatus for displaying a projected image comprising: a compensating layer on a backing means, said compensating layer having a varied reflectivity pattern for compensating for predetermined projected bright spot variations in light intensity levels generated by an image projector having variations imperceiveable to human observers and detectable by reproduction of an image on the apparatus.
Claim 2
Dependent Claim
57 words
Projection screen apparatus for displaying a projected image comprising: a compensating layer on a backing means, said compensating layer having a varied reflectivity pattern for compensating for predetermined projected bright spot variations in light intensity levels generated by an image projector having variations imperceiveable to human observers and detectable by reproduction of an image on the apparatus.
Claim 3
Dependent Claim
24 words
Apparatus as in claim 1, wherein said projection surface reflectivity pattern is inverse to a pattern of light intensity produced by an image projector.
Claim 4
Dependent Claim
32 words
Apparatus as in claim 2, wherein said projection surface includes a center portion and edge portions, said projection surface reflectivity pattern increasing in darkness from said edge Portions into said center portion.
Claim 5
Dependent Claim
24 words
Apparatus as in claim 3, including a uniform tinted layer, and a photographic emulsion layer over said tinted layer for forming said compensating layer.
Claim 6
Dependent Claim
17 words
Apparatus as in claim 4, wherein said tinted layer includes an oil base surface applied by silk-screening.
Claim 7
Dependent Claim
22 words
Apparatus as in claim 4, wherein said photographic emulsion layer is exposed to a predetermined average projection pattern of an image projector.
Claim 8
Dependent Claim
11 words
Apparatus as in claim 6, wherein said tinted layer is grey.
Claim 9
Dependent Claim
11 words
Apparatus as in claim 6, wherein said tinted layer is black.
Claim 10
Dependent Claim
29 words
Apparatus as in claim 6, wherein said apparatus includes a viewing side and a nonviewing side, said viewing side receiving said projected image and displaying said image for viewing.
Claim 11
Dependent Claim
41 words
Apparatus as in claim 8, in which the tinted layer comprises a darkened surface for absorbing interfering reflected light to reduce light scattering effects for accommodating enhanced video recording of said image and reducing halation effects in the resultant video image.
Claim 12
Dependent Claim
45 words
Projection screen apparatus for projecting an image comprising: a flat darkened absorbing layer on a backing means for absorbing interfering reflected light to reduce reflected light scattering effects for accommodating enhanced video recording of said image and reducing halation effects in the resultant video image.
Claim 13
Dependent Claim
45 words
Projection screen apparatus for projecting an image comprising: a flat darkened absorbing layer on a backing means for absorbing interfering reflected light to reduce reflected light scattering effects for accommodating enhanced video recording of said image and reducing halation effects in the resultant video image.
Claim 14
Dependent Claim
15 words
Apparatus as in claim 11, wherein said flat darkened absorbing layer includes a black surface.
Claim 15
Dependent Claim
18 words
Apparatus as in claim 10, wherein said flat darkened absorbing layer includes a silk-screened black oil base surface.
Claim 16
Independent Claim
51 words
A method of making projection screen apparatus for displaying projected image for video recording and the like, comprising: making a darkened compensating layer on a backing means, said compensating layer having a varied reflectivity pattern for compensating for predetermined projected bright spot variations in light intensity generated by an image projector.
Claim 17
Independent Claim
51 words
A method of making projection screen apparatus for displaying projected image for video recording and the like, comprising: making a darkened compensating layer on a backing means, said compensating layer having a varied reflectivity pattern for compensating for predetermined projected bright spot variations in light intensity generated by an image projector.
Claim 18
Dependent Claim
35 words
Method as in claim 14, wherein said making a darkened compensating layer includes producing a projection surface having a reflectivity pattern inverse to a predetermined average pattern of light intensity produced by an image projector.
Claim 19
Dependent Claim
23 words
Method as in claim 15, wherein said producing includes applying photo emulsion means to a substrate for developing the projection surface reflectivity pattern.
Claim 20
Dependent Claim
56 words
Method as in claim 16, wherein said applying of a photo emulsion means includes coating said substrate with a light sensitive photographic emulsion layer and exposing said emulsion layer to a predetermined average projection pattern of an image Projector, thereby developing a reflectivity pattern on said apparatus inverse to the projection pattern of the image projector.
Claim 21
Dependent Claim
29 words
Method as in claim 17, wherein said applying of said compensating means includes applying a tinted surface on said substrate prior to applying said light sensitive photographic emulsion layer.
Claim 22
Dependent Claim
21 words
Method as in claim 18, wherein said applying of said tinted surface includes silk-screening on oil base surface to said substrate.
Claim 23
Dependent Claim
17 words
Method as in claim 18, wherein said applying of a tinted surface includes applying a grey surface.
Claim 24
Dependent Claim
17 words
Method as in claim 18, wherein said applying of a tinted surface includes applying a black surface.
Claim 25
Dependent Claim
25 words
Method as in claim 17, further comprising preparing a positive film image, said positive film image serving as a master for exposing said emulsion layer.
Claim 26
Dependent Claim
29 words
Method as in claim 22, wherein said preparing a positive film image includes using a camera to photograph a standard slide projector light pattern image on a slide screen.
Claim 27
Dependent Claim
20 words
Method as in claim 14, comprising darkening of a screen surface while monitoring the screen surface with a TV camera.
Claim 28
Dependent Claim
20 words
Method as in claim 24, wherein said darkening includes applying darkening ink to the screen surface using manually operable airbrush.
Claim 29
Dependent Claim
52 words
Method as in claim 25, wherein said monitoring includes using a wave form monitor to analyze the light intensity pattern on the screen surface, said airbrushing being performed to produce substantially uniform average brightness over the surface of the screen surface with a standard slide projector lamp projection on the screen surface.
Claim 30
Dependent Claim
26 words
Method as in claim 26, further comprising using the airbrushed screen surface as a master surface for photographically replicating corresponding slide screen surfaces using silk-screen techniques.
Claim 31
Independent Claim
53 words
A method of making projection screen apparatus for displaying a light projected image for video recording and the like comprising: making a flat darkened absorbing layer on a backing means for absorbing interfering reflected light to thereby reduce reflected light scattering halation effects on the video recording of said image or the like.
Claim 32
Independent Claim
53 words
A method of making projection screen apparatus for displaying a light projected image for video recording and the like comprising: making a flat darkened absorbing layer on a backing means for absorbing interfering reflected light to thereby reduce reflected light scattering halation effects on the video recording of said image or the like.
Claim 33
Dependent Claim
20 words
Method as in claim 28, wherein said absorbing layer includes a coating on said substrate with a uniform black surface.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |