US4774711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor laser apparatus
Assignee: Canon Inc
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Filing: 1987-11-13
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Granted: 1988-09-27
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Expires: 2007-11-13
Abstract
Abstract A semiconductor laser apparatus comprising a plurality of laser elements comprising an array, a plurality of photodetector elements respectively corresponding to the plurality of laser elements, and a light shield member. Each laser element is adapted to generate a laser beam in two directions. Each photodetector element is adapted to receive a laser beam from a laser element. The light shield member prevents the light generated by each of the plurality of laser elements from entering photodetectors other than those to which they correspond.
Inventors
- 👤 Toshitami Hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/40; H01S5/4025; H01S5/4031; H10; H10F; H10F55/00; H01S5/02; H01S5/026; H01S5/0262; H01S5/0264
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
A semiconductor laser device comprising: a plurality of laser elements comprising an array, wherein each of said laser elements generates a laser beam in two directions; a plurality of photodetector elements respectively corresponding to said plurality of laser elements for directly receiving laser beams therefrom, said photodetector elements being formed in a monolithic manner together with said laser array elements; wherein said device has a grooved portion for separating each of said laser element arrays from said plurality of photodetector elements; and a light shield member provided in said grooved portion in an area between pairs of said laser element array and said photodetector element and including a portion projecting from a bottom of said grooved portion, said light shield member preventing the light emitted from each of said laser elements from entering the photodetector elements except for the corresponding photodetector element.
Claim 2
Dependent Claim
142 words
A semiconductor laser device comprising: a plurality of laser elements comprising an array, wherein each of said laser elements generates a laser beam in two directions; a plurality of photodetector elements respectively corresponding to said plurality of laser elements for directly receiving laser beams therefrom, said photodetector elements being formed in a monolithic manner together with said laser array elements; wherein said device has a grooved portion for separating each of said laser element arrays from said plurality of photodetector elements; and a light shield member provided in said grooved portion in an area between pairs of said laser element array and said photodetector element and including a portion projecting from a bottom of said grooved portion, said light shield member preventing the light emitted from each of said laser elements from entering the photodetector elements except for the corresponding photodetector element.
Claim 3
Dependent Claim
26 words
A semiconductor laser apparatus according to claim 1, wherein said plural laser elements of the array and said photodetector elements are formed in a monolithic structure.
Claim 4
Dependent Claim
23 words
A semiconductor laser device according to claim 1 wherein said grooved portion is formed between said laser elements of said laser element array.
Claim 5
Dependent Claim
18 words
A semiconductor laser device according to claim 1 wherein said grooved portion is formed between said photodetector elements.
Claim 6
Dependent Claim
30 words
A semiconductor laser device according to claim 1, wherein said light shield member has the same height as that of said laser element from the bottom of said grooved portion.
Claim 7
Dependent Claim
35 words
A semiconductor laser device according to claim 5, wherein all of said laser elements, said photodetector elements and said light shield member are formed by a semiconductor laminated layer member made of the same material.
Claim 8
Dependent Claim
121 words
A semiconductor laser device comprising: a plurality of laser elements arranged in an array, wherein each of said laser elements generates a laser beam in each of two directions; a plurality of photodetector elements respectively corresponding to said plurality of laser elements, each for directly receiving one of the laser beams generated in the two directions by each of said laser elements; and light shield means provided in an area between pairs of said laser elements and said photodetector elements in a space between the adjacent laser elements and the adjacent photodetector elements, said light shield means preventing the light emitted from each of said laser elements from entering the photodetector elements except for light emitted from the corresponding photodetector element.
Claim 9
Dependent Claim
121 words
A semiconductor laser device comprising: a plurality of laser elements arranged in an array, wherein each of said laser elements generates a laser beam in each of two directions; a plurality of photodetector elements respectively corresponding to said plurality of laser elements, each for directly receiving one of the laser beams generated in the two directions by each of said laser elements; and light shield means provided in an area between pairs of said laser elements and said photodetector elements in a space between the adjacent laser elements and the adjacent photodetector elements, said light shield means preventing the light emitted from each of said laser elements from entering the photodetector elements except for light emitted from the corresponding photodetector element.
References Cited (Backward Citations)
JPS5257790A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |