Patent US4645915A successfully refreshed from Google Patents.
US4645915A
Expired / Lapsed
US
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Bar code reader
Assignee: US Philips Corp
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Filing: 1984-09-12
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Granted: 1987-02-24
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Expires: 2004-09-12
Abstract
Abstract A bar code reader comprises a semiconductor laser diode. A first end face of the laser diode is optically coupled to an end of an optical fiber. A second end face of the laser diode is optically coupled to a detector. The bar code is scanned at the free end of the optical fiber. This information is read by the semiconductor laser diode by way of optical feedback.
Inventors
- 👤 Lodewijk J. Van Ruyven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:41
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10712; G06K7/10762; G11; G11B; G11B7/00; G11B7/12; G11B7/13
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A bar code reader comprising: a semiconductor laser diode having first and second opposite end faces, said laser diode emitting light from the end faces; an optical waveguide having a first end optically coupled to the first end face of the laser diode; and a detector for detecting light from the laser diode, said detector having an input optically coupled to the second end face of the laser diode.
Claim 2
Dependent Claim
69 words
A bar code reader comprising: a semiconductor laser diode having first and second opposite end faces, said laser diode emitting light from the end faces; an optical waveguide having a first end optically coupled to the first end face of the laser diode; and a detector for detecting light from the laser diode, said detector having an input optically coupled to the second end face of the laser diode.
Claim 3
Dependent Claim
24 words
A bar code reader as claimed in claim 1, characterized in that the laser diode emits light having a wavelength greater than 1.3 microns.
Claim 4
Dependent Claim
19 words
A bar code reader as claimed in claim 2, characterized in that the laser diode is an InGaAsP diode.
Claim 5
Dependent Claim
20 words
A bar code reader as claimed in claim 3, characterized in that the reader is incorporated in a cash register.
Claim 6
Dependent Claim
23 words
A bar code reader as claimed in claim 3, characterized in that the reader is at least partially accommodated in a light pen.
Claim 7
Dependent Claim
28 words
A bar code reader as claimed in claim 1, characterized in that the end faces of the laser diode are partly transparent mirrors which form a laser resonator.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |