Patent US5485225A successfully refreshed from Google Patents.
US5485225A
Expired / Lapsed
US
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Video projection system using picture and line scanning
Assignee: LDT Laser Display Technology GmbH
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Filing: 1994-07-05
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Granted: 1996-01-16
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Expires: 2014-07-05
Abstract
Abstract A video projection system with at least one light source which can be controlled in intensity and generates at least one light bundle and with a deflecting device which deflects the light bundle sequentially to produce picture points of a video picture on a screen by picture and line scanning has two component groups, the first of which contains at least one light source and has a light output from which at least one light bundle exits, while the second component group contains the deflecting device and has a light input through which a light bundle can be imaged into the deflecting device. Further, a light transmission device is provided which enables the light output of the first component group to be optically connected with the light input of the second component group.
Inventors
- 👤 Christhard Deter
- 👤 Jorg Wunderlich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:27
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3129
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
162 words
A video projection system for producing picture points of a video picture on a screen by picture and line scanning, comprising: a first component group containing at least one light source which can be controlled in intensity and having a light output from which at least one light bundle exits, said first component group including means for modulating the intensity of said one light source with video information; a second component group having a deflecting device and having a light input through which a light bundle can be imaged into the deflecting device; a light transmission device having an output for optically connecting the light output of the first component group with the light input of the second component group and for allowing an optional arrangement of the two component groups relative to each other; and an optical system arranged between said output of said light transmission device and said deflecting device for bundling the light exiting from said light transmission device.
Claim 2
Dependent Claim
162 words
A video projection system for producing picture points of a video picture on a screen by picture and line scanning, comprising: a first component group containing at least one light source which can be controlled in intensity and having a light output from which at least one light bundle exits, said first component group including means for modulating the intensity of said one light source with video information; a second component group having a deflecting device and having a light input through which a light bundle can be imaged into the deflecting device; a light transmission device having an output for optically connecting the light output of the first component group with the light input of the second component group and for allowing an optional arrangement of the two component groups relative to each other; and an optical system arranged between said output of said light transmission device and said deflecting device for bundling the light exiting from said light transmission device.
Claim 3
Dependent Claim
17 words
The video projection system according to claim 1, wherein the light transmission device contains a mirror system.
Claim 4
Dependent Claim
20 words
The video projection system according to claim 2, wherein the position of the mirrors relative to each other is adjustable.
Claim 5
Dependent Claim
19 words
The video projection system according to claim 1, wherein the light transmission device contains at least one optical fiber.
Claim 6
Dependent Claim
19 words
The video projection system according to claim 4, wherein said at least one optical fiber is a multimode fiber.
Claim 7
Dependent Claim
44 words
The video projection system according to claim 1 for a color video picture with at least three light sources of different wavelengths, wherein an optical arrangement is provided which combines the light bundles emerging from the light sources to form a common light bundle.
Claim 8
Dependent Claim
18 words
The video projection system according to claim 5, wherein said multimode fiber transmits the various wavelengths without damping.
Claim 9
Dependent Claim
38 words
The video projection system according to claim 5, wherein said multimode fiber transmits the various wavelengths so that the difference in damping from one wavelength to another is insubstantial so that the maximum deviation is less than 15%.
Claim 10
Dependent Claim
20 words
The video projection system according to claim 6, wherein the optical arrangement for combining the light bundles contains dichroic mirrors.
Claim 11
Dependent Claim
30 words
The video projection system according to claim 5, wherein the light transmission device for transmitting the light bundles generated by the light sources contains a monomode fiber for each wavelength.
Claim 12
Dependent Claim
33 words
The video projection system according to claim 4, wherein a first optical system which couples the incident light into the optical fibers is arranged on the input side of the light transmission device.
Claim 13
Dependent Claim
30 words
The video projection system according to claim 11, wherein an image-side focal point associated with the first optical system is situated in the light entry surface of the optical fiber.
Claim 14
Dependent Claim
37 words
The video projection system according to claim 12, wherein a second optical system which directs the light exiting from the optical fibers into the deflecting device is arranged at the output side of the light transmission device.
Claim 15
Dependent Claim
24 words
The video projection system of claim 13, wherein said second optical system bundles the light exiting from the optical fibers into the deflecting device.
Claim 16
Dependent Claim
24 words
The video projection system of claim 13, wherein said second optical system focusses the light exiting from the optical fiber into the deflecting device.
Claim 17
Dependent Claim
38 words
The video projection system according to claim 13, wherein an aperture associated with the second optical system is designed in such a way that the light beam exiting from the optical fiber is fully covered by the aperture.
Claim 18
Dependent Claim
30 words
The video projection system according to claim 13, wherein an object-side focal point associated with the second optical system is arranged in the light outlet surface of the optical fibers.
Claim 19
Dependent Claim
60 words
The video projection system according to claim 1, wherein an optical system is provided between said deflecting device and a screen and, on the output side, said optical system enlarges the solid angle covered by the deflecting device on the input side when deflecting the light bundle for picture and line scanning. Add new claims 19 and 20 as follows:
Claim 20
Dependent Claim
24 words
The video projection system according to claim 1, wherein said deflecting device of said second component group is constructed as a mechanical scanning device.
Claim 21
Dependent Claim
21 words
The video projection system according to claim 19, wherein said mechanical scanning device includes a polygonal mirror and a swiveling mirror.
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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) | 1999-01-15 | 1999-07-17 | 2000-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-15 | 2003-07-17 | 2004-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-15 | 2007-07-17 | 2008-01-16 | $7700.00 | Window Closed / Lapsed |