US5229591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning system with adjustable light output and/or scanning angle
Assignee: Symbol Technologies LLC
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Filing: 1992-01-06
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Granted: 1993-07-20
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Expires: 2012-01-06
Abstract
Abstract Apparatus for reading bar code symbols including a laser light source, an optical component for scanning a reference plane, and a sensor for detecting the light of variable intensity reflected from the target. A processor determines whether the reflected light represents a spatial variation that could represent a bar code and generates an enabling signal and a controller is provided for modifying the light beam in response to the enabling signal.
Inventors
- 👤 Frederic Heiman
- 👤 Glenn Spitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:28
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10851; G06K7/10554; G06K7/10594; G06K7/10603; G06K7/10633; G06K7/10643; G06K7/10653; G06K7/10712; G06K7/10722; G06K2207/00; G06K2207/1011; G06K2207/1016; G06K2207/1017; G06K2207/1018
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
151 words
A device for reading bar code symbols or the like, comprising: a light source for generating a continuous light beam directed toward a symbol to be read during a symbol reading operation to produce a scanned spot, wherein said spot is scanned across said symbol; a detector receiving reflected light from said scanned spot on such symbol to produce electrical signals corresponding to a representation of the symbols during said reading operation; a control circuit for modifying said continuous light beam during said reading operation in response to said electrical signals from said detector by varying said light source between a narrow-scan low power mode of operation and a wide-scan higher power mode of operation, wherein said control circuit is responsive to whether said electrical signals represent a pattern of a bar code symbol to vary said light source between said narrow-scan low power mode and said wide-scan higher power mode.
Claim 2
Independent Claim
151 words
A device for reading bar code symbols or the like, comprising: a light source for generating a continuous light beam directed toward a symbol to be read during a symbol reading operation to produce a scanned spot, wherein said spot is scanned across said symbol; a detector receiving reflected light from said scanned spot on such symbol to produce electrical signals corresponding to a representation of the symbols during said reading operation; a control circuit for modifying said continuous light beam during said reading operation in response to said electrical signals from said detector by varying said light source between a narrow-scan low power mode of operation and a wide-scan higher power mode of operation, wherein said control circuit is responsive to whether said electrical signals represent a pattern of a bar code symbol to vary said light source between said narrow-scan low power mode and said wide-scan higher power mode.
Claim 3
Dependent Claim
30 words
A device according to claim 1 wherein said control circuit includes a timer to cause said device to operate in said high power mode for only a predetermined time duration.
Claim 4
Dependent Claim
31 words
A device according to claim 1 wherein said control circuit includes a timer to switch to said low power mode at a selected time after switching to said high power mode.
Claim 5
Dependent Claim
26 words
A device according to claim 1 wherein said light beam is modified by varying the spot size produced where the light beam impinges upon said symbol.
Claim 6
Dependent Claim
117 words
A bar code reader comprising: a light beam scanner generating a light beam directed toward a symbol to be read and moving said light beam along said symbol during a symbol reading operation to provide a scan; a light detector receiving reflected light from said symbol and generating electrical signals responsive to said reflected light during said reading operation; said light beam scanner being controlled during said reading operation in response to said electrical signals to provide a first narrow-scan mode of operation for finding said symbol and a second wide-scan mode of operation for interpreting the contents of said symbol; wherein said light beam scanner includes a semiconductor laser light source to produce said light beam.
Claim 7
Dependent Claim
117 words
A bar code reader comprising: a light beam scanner generating a light beam directed toward a symbol to be read and moving said light beam along said symbol during a symbol reading operation to provide a scan; a light detector receiving reflected light from said symbol and generating electrical signals responsive to said reflected light during said reading operation; said light beam scanner being controlled during said reading operation in response to said electrical signals to provide a first narrow-scan mode of operation for finding said symbol and a second wide-scan mode of operation for interpreting the contents of said symbol; wherein said light beam scanner includes a semiconductor laser light source to produce said light beam.
Claim 8
Dependent Claim
24 words
A device according to claim 5 wherein said light beam scanner produces a light beam of intensity selectable in response to said electrical signals.
Claim 9
Dependent Claim
29 words
A device according to claim 6 wherein said light beam scanner includes a semiconductor laser light source, and is controlled by varying the drive current of said light source.
Claim 10
Dependent Claim
37 words
A device according to claim 7 wherein said drive current is varied to provide a low power mode until said electrical signal indicates that a bar code symbol is present, then to provide a high power mode.
Claim 11
Independent Claim
128 words
A method of scanning bar code symbols or the like, comprising the steps of: directing a light beam toward a bar code symbol to read, and scanning said light beam on a path along said symbol during a symbol reading operation; detecting light reflected from the symbol and generating an electrical signal in response to said reflected light; determining whether or not said electrical signal exhibits characteristics of a bar code signal, and modifying said light beam in response to a content of said electrical signal during said symbol reading operation, wherein said step of modifying includes changing the shape of said path from a first narrow-scan shape to a second different wide-scan shape, and wherein said step of modifying is in response to said step of determining.
Claim 12
Independent Claim
128 words
A method of scanning bar code symbols or the like, comprising the steps of: directing a light beam toward a bar code symbol to read, and scanning said light beam on a path along said symbol during a symbol reading operation; detecting light reflected from the symbol and generating an electrical signal in response to said reflected light; determining whether or not said electrical signal exhibits characteristics of a bar code signal, and modifying said light beam in response to a content of said electrical signal during said symbol reading operation, wherein said step of modifying includes changing the shape of said path from a first narrow-scan shape to a second different wide-scan shape, and wherein said step of modifying is in response to said step of determining.
Claim 13
Dependent Claim
34 words
A method according to claim 9 wherein said step of modifying includes controlling the intensity of said light beam and the length of said path in response to the character of said electrical signal.
Claim 14
Dependent Claim
27 words
A method according to claim 9 wherein said step of determining includes counting the rate of transitions of said reflected light from one state to another state.
Claim 15
Dependent Claim
25 words
A method according to claim 9 wherein said step of determining includes detecting the ratio to one state to another state of said reflected light.
Claim 16
Dependent Claim
39 words
A method according to claim 9 wherein said step of determining includes comparing a said electrical signal for one scan of said symbol by said light beam to that for another scan of said symbol by said light beam.
Claim 17
Dependent Claim
39 words
A method according to claim 9 wherein said light source is a semiconductor laser diode and said step of modifying includes changing the drive current to said laser diode from a low power mode to a high power mode.
Claim 18
Dependent Claim
25 words
A method according to claim 14 wherein said changing is in response to said electrical signal exhibiting the characteristic of a scanned bar code symbol.
References Cited (Backward Citations)
US3925639A
Cited
US4125765A
Cited
US4315245A
Cited
US4160156A
Cited
US4251798A
Cited
US4360798A
Cited
US4387297B1
Cited
US4593186A
Cited
US4387297A
Cited
US4496831A
Cited
US4369361A
Cited
US4418276A
Cited
US4431912A
Cited
US4481667A
Cited
US4673805A
Cited
US4845350A
Cited
US4460120A
Cited
US4736095A
Cited
US4758717A
Cited
US4845350B1
Cited
US4489470A
Cited
US4575625A
Cited
US4521678A
Cited
US4639606A
Cited
US4734566A
Cited
US4806742A
Cited
US4816660A
Cited
US4760248A
Cited
US4816660B1
Cited
US4694182A
Cited
US4820911A
Cited
US4782220A
Cited
US4870262A
Cited
US4766297A
Cited
US4808804A
Cited
US4970379A
Cited
US4871904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |