Patent US4019026A successfully refreshed from Google Patents.
US4019026A
Expired / Lapsed
US
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Laser beam label reader head
Assignee: Shinko Electric Co Ltd
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Filing: 1975-09-23
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Granted: 1977-04-19
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Expires: 1995-09-23
Abstract
Abstract A laser beam label reader head of single common axis type wherein light reflection coming from a laser-irradiated label along the axis of a scanning laser beam is diverted by an apertured mirror toward a photoelectric converter. The photoelectric converter is provided with means for removing and blocking incident general light coming from sources other than the laser-irradiated label to preclude influences by ambient light and improve S/N ratio.
Inventors
- 👤 Sadao Nakanishi
- 👤 Nobufumi Tokura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:37
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10861; G06K7/10871
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
144 words
A laser beam label reader head for reading code information on a label by irradiation of a laser beam, comprising in combination: a laser tube for radiation of a laser beam; a polyhedral rotating mirror located in position to reflect the laser beam from said laser tube toward a label to scan code information on the label; an apertured mirror positioned between said laser tube and said polyhedral rotating mirror and having a center aperture to allow passage therethrough of said laser beam from said laser tube, said apertured mirror being held in a slanting position to divert a portion of the light reflections which comes from said label along the axis of the scanning laser beam; and an photoelectric converter located in position to receive the diverted light portion and adapted to pick up light signals therefrom for conversion into corresponding electric signals.
Claim 2
Dependent Claim
144 words
A laser beam label reader head for reading code information on a label by irradiation of a laser beam, comprising in combination: a laser tube for radiation of a laser beam; a polyhedral rotating mirror located in position to reflect the laser beam from said laser tube toward a label to scan code information on the label; an apertured mirror positioned between said laser tube and said polyhedral rotating mirror and having a center aperture to allow passage therethrough of said laser beam from said laser tube, said apertured mirror being held in a slanting position to divert a portion of the light reflections which comes from said label along the axis of the scanning laser beam; and an photoelectric converter located in position to receive the diverted light portion and adapted to pick up light signals therefrom for conversion into corresponding electric signals.
Claim 3
Dependent Claim
61 words
A laser beam label reader head as claimed in claim 1, wherein said photoelectric converter comprises filter means adapted to pass laser light only and remove other general light components, a condensing lens and a diaphragm for blocking disturbing light from sources other than the laser irradiated label, and a photomultipler tube located behind said filter means, condensing lens and diaphragm.
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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |