Patent US4417253A successfully refreshed from Google Patents.
US4417253A
Expired / Lapsed
US
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Arrangement for laser pumping in a combined laser recording and color projection system
Assignee: Singer Co
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Filing: 1981-12-16
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Granted: 1983-11-22
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Expires: 2001-12-16
Abstract
Abstract In a display system which uses a laser beam for writing data and a projection lamp for projecting the written data onto a viewing surface, there is provided an arrangement which utilizes the projection lamp for providing excitation energy for the laser.
Inventors
- 👤 Herbert G. Jacks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:11
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; G; G01; G01D; G01D9/00; G01D9/28; G01D9/32
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
In a recording and projection system which includes a laser utilized for recording an image and a source of projection light utilized for projecting the recorded image, the improvement comprising: means utilizing said projection light source for providing excitation energy for said laser.
Claim 2
Dependent Claim
43 words
In a recording and projection system which includes a laser utilized for recording an image and a source of projection light utilized for projecting the recorded image, the improvement comprising: means utilizing said projection light source for providing excitation energy for said laser.
Claim 3
Dependent Claim
32 words
The improvement according to claim 1 wherein said excitation energy providing means includes means for directing light having wavelengths above the normal visible range from the projection light source to said laser.
Claim 4
Dependent Claim
72 words
The improvement according to claim 2 wherein said directing means includes a dichroic element arranged to pass light from said projection light source which has wavelengths within the normal visible range in a first direction to be utilized for projecting the recorded image and to pass light from said projection light source which has wavelengths above the normal visible range in a second direction to said laser for providing excitation energy therefore.
Claim 5
Dependent Claim
38 words
The improvement according to claim 3 wherein said projection light source provides a collimated beam of light and further including an aspheric optical lens interposed between said dichroic element and said laser for substantially uniformly illuminating said laser.
Claim 6
Dependent Claim
46 words
The improvement according to claim 2 further including means for only passing light to said laser which is within a limited band of wavelengths above the normal visible range, that band being such that excitation energy is provided to said laser without substantially heating said laser.
Claim 7
Dependent Claim
25 words
The improvement according to claim 5 wherein said laser is a YAG laser and said limited band is from about 700 to about 900 nanometers.
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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |