US5581069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Louvered light collection arrangement in electro-optical reading systems
Assignee: Symbol Technologies LLC
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Filing: 1995-05-10
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Granted: 1996-12-03
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Expires: 2015-05-10
Abstract
Abstract A louver is mounted adjacent a sensor in a housing of a laser scanning head of a system for electro-optically reading bar code symbols. The louver includes a plurality of mutually parallel, permanently-open slots. The slats are inclined to allow more light from far-out symbols to reach the sensor as compared to close-in symbols.
Inventors
- 👤 Howard M. Shepard
- 👤 Edward D. Barkan
- 👤 Jerome Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
G; G06; G06K; G06K17/00; G06K17/0022; G06K7/00; G06K7/10; G06K7/10544; G06K7/10554; G06K7/10594; G06K7/10683; G06K7/10702; G06K7/10821; G06K7/10881; G06K7/109
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
A system for electro-optically reading coded indicia, comprising: a) a housing; b) means in the housing for generating alight beam and for directing the light beam towards a reference plane located exteriorly of the housing, and towards indicia located at either side of the reference plane, to thereby generate reflected light of variable intensity which travels away from the indicia and back towards the housing; c) sensor means in the housing for detecting the variable light intensity of the reflected light over a field of view, and for generating electrical signals indicative of the detected light intensity; d) means for scanning at least one of the light beam and the field of view; e) a louver adjacent the sensor means for allowing a lesser proportion of the reflected light from close-in indicia located between one side of the reference plane and the housing to pass through the louver to the sensor means, and a greater proportion of the reflected light from far-out indicia located on the opposite side of the reference plane away from the housing; and f) signal processing means in the housing, for processing the electrical signals to generate therefrom data descriptive of the indicia.
Claim 2
Independent Claim
197 words
A system for electro-optically reading coded indicia, comprising: a) a housing; b) means in the housing for generating alight beam and for directing the light beam towards a reference plane located exteriorly of the housing, and towards indicia located at either side of the reference plane, to thereby generate reflected light of variable intensity which travels away from the indicia and back towards the housing; c) sensor means in the housing for detecting the variable light intensity of the reflected light over a field of view, and for generating electrical signals indicative of the detected light intensity; d) means for scanning at least one of the light beam and the field of view; e) a louver adjacent the sensor means for allowing a lesser proportion of the reflected light from close-in indicia located between one side of the reference plane and the housing to pass through the louver to the sensor means, and a greater proportion of the reflected light from far-out indicia located on the opposite side of the reference plane away from the housing; and f) signal processing means in the housing, for processing the electrical signals to generate therefrom data descriptive of the indicia.
Claim 3
Dependent Claim
22 words
The system as defined in claim 1, wherein the louver includes a plurality of mutually parallel, permanently-open slats mounted on the housing.
Claim 4
Dependent Claim
34 words
The system as defined in claim 2, wherein the housing has a window through which the reflected light enters the housing, and wherein the slats are mounted between the window and the sensor means.
Claim 5
Dependent Claim
44 words
The system as defined in claim 2, wherein the housing has a window through which the reflected light enters the housing, and wherein the slats are mounted in front of the window on a side of the window facing away from the sensor means.
Claim 6
Dependent Claim
16 words
The system as defined in claim 2, wherein the slats are stationarily mounted on the housing.
Claim 7
Dependent Claim
14 words
The system as defined in claim 2, wherein the sensor means includes a photodiode.
Claim 8
Independent Claim
139 words
A system for electro-optically reading coded indicia, comprising: a) a housing; b) means in the housing for generating a light beam and for directing the light beam towards a reference plane located exteriorly of the housing, and towards indicia located at either side of the reference plane, to thereby generate reflected light of variable intensity which travels away from the indicia and back towards the housing; c) sensor means in the housing for detecting the variable light intensity of the reflected light over a field of view, and for generating electrical signals indicative of the detected light intensity; d) means for scanning at least one of the light beam and the field of view; e) a louver adjacent the sensor means; and f) signal processing means for processing the electrical signals to generate therefrom data descriptive of the indicia.
Claim 9
Independent Claim
139 words
A system for electro-optically reading coded indicia, comprising: a) a housing; b) means in the housing for generating a light beam and for directing the light beam towards a reference plane located exteriorly of the housing, and towards indicia located at either side of the reference plane, to thereby generate reflected light of variable intensity which travels away from the indicia and back towards the housing; c) sensor means in the housing for detecting the variable light intensity of the reflected light over a field of view, and for generating electrical signals indicative of the detected light intensity; d) means for scanning at least one of the light beam and the field of view; e) a louver adjacent the sensor means; and f) signal processing means for processing the electrical signals to generate therefrom data descriptive of the indicia.
References Cited (Backward Citations)
US4409470A
Cited
US4673805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-03 | 2000-06-03 | 2000-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-03 | 2004-06-03 | 2004-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-03 | 2008-06-03 | 2008-12-03 | $7700.00 | Window Closed / Lapsed |