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US4591706A
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Photodetector
Assignee: SB ELECTRONIC SYSTEMS Ltd ARDEN GROVE HARPENDEN HERTFORDSHIRE AL5 5SL ENGLAND A Co OF BRITISH
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Filing: 1984-07-30
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Granted: 1986-05-27
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Expires: 2004-07-30
Abstract
Abstract A photodetector and light source assembly useful in a bar-code reading system comprises a semiconductor substrate with holes therein. A light source form of LED's mounted on one side of the substrate corresponding with the respective holes illuminates an object plane, via a lens system, on the other side of the substrate. Preferably, the light received by the photodetector is slightly out of focus. Advantages include a saving in cost and size together with an improved depth of field and efficiency of illumination.
Inventors
- 👤 George E. Sims
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:26
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10554; G06K7/10564; G06K7/10574; G06K7/10792; G06K7/10801; G06K7/10811; G06K2207/00; G06K2207/1013
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
40 words
A photodetector made from semiconductor material, said material being in the form of an apertured body or substrate to enable a light source to be mounted on one side thereof for illuminating the other side via the aperture or apertures.
Claim 2
Dependent Claim
40 words
A photodetector made from semiconductor material, said material being in the form of an apertured body or substrate to enable a light source to be mounted on one side thereof for illuminating the other side via the aperture or apertures.
Claim 3
Dependent Claim
26 words
A photodetector according to claim 1, wherein the aperture or apertures are in the form of a through hole or holes in said body or substrate.
Claim 4
Dependent Claim
23 words
A photodetector according to claim 2, wherein said holes are located at the apices of a triangle centered on said body or substrate.
Claim 5
Dependent Claim
20 words
A photodetector according to claim 1, wherein said apertured body or substrate is formed by etching an amorphous silicon substrate.
Claim 6
Dependent Claim
48 words
A photodetector and light source assembly comprising a photodetector made from semiconductor material, said material being in the form of an apertured body or substrate, and a light source mounted on one side of said body or substrate for illuminating the other side via the aperture or apertures.
Claim 7
Dependent Claim
48 words
A photodetector and light source assembly comprising a photodetector made from semiconductor material, said material being in the form of an apertured body or substrate, and a light source mounted on one side of said body or substrate for illuminating the other side via the aperture or apertures.
Claim 8
Dependent Claim
30 words
A photodetector and light source assembly according to claim 4, wherein the aperture or apertures are in the form of a through hole or holes in said body or substrate.
Claim 9
Dependent Claim
27 words
A photodetector and light source assembly according to claim 5, wherein said holes are located at the apices of a triangle centered on said body or substrate.
Claim 10
Dependent Claim
24 words
A photodetector and light source assembly according to claim 5, wherein said apertured body or substrate is formed by etching an amorphous silicon substrate.
Claim 11
Dependent Claim
31 words
A photodetector and light source assembly according to claim 5, wherein said light source is in the form of one or more light emitting diodes bonded to said body or substrate.
Claim 12
Dependent Claim
67 words
A bar-code reader comprising a photodetector made from semiconductor material, said material being in the form of an apertured body or substrate, a light source mounted on one side of said body or substrate for illuminating the other side via the aperture or apertures, and a lens system for focusing light from said light source onto a focal plane and for returning reflected light to the photodetector.
Claim 13
Dependent Claim
67 words
A bar-code reader comprising a photodetector made from semiconductor material, said material being in the form of an apertured body or substrate, a light source mounted on one side of said body or substrate for illuminating the other side via the aperture or apertures, and a lens system for focusing light from said light source onto a focal plane and for returning reflected light to the photodetector.
Claim 14
Dependent Claim
27 words
A bar-code reader according to claim 10, wherein the aperture or apertures are in the form of a through hole or holes in said body or substrate.
Claim 15
Dependent Claim
24 words
A bar-code reader according to claim 11, wherein said holes are located at the apices of a triangle centered on said body or substrate.
Claim 16
Dependent Claim
28 words
A bar-code reader according to claim 10, wherein said light source is in the form of one or more light emitting diodes bonded to said body or substrate.
Claim 17
Dependent Claim
21 words
A bar-code reader according to claim 10, wherein said apertured body or substrate is formed by etching an amorphous silicon substrate.
References Cited (Backward Citations)
US4376483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |