Patent US5397885A successfully refreshed from Google Patents.
US5397885A
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US
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Hand-held barcode label reader with increased depth of field
Assignee: Reflexion Plus
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Filing: 1993-12-29
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Granted: 1995-03-14
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Expires: 2013-12-29
Abstract
Abstract A barcode label reader comprises a read window having a longer dimension parallel to an X axis and a lens system with an optical axis Y substantially normal to the window at its center which projects a conjugate image of a read line of the label onto a CCD type strip which is scanned sequentially to form a signal representing the barcode carried by the label. A strip of light-emitting diodes is disposed outside the X-Y plane to illuminate the label through the read window. A prismlike lens in the form of two refractors separated by a slot in the X-Y plane deflects the beam emitted by this strip so that it is substantially parallel to the X-Y plane. Thus, the depth of field of the reader is limited only by the aperture of the lens system.
Inventors
- 👤 Jean-Louis Massieu
- 👤 Jean-Michel Puech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:33
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10881
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
Hand-held barcode label reader having an oblong rear window which is offered up substantially parallel to the label with a longer dimension transverse to the bars, the reader including a lens system with an optical axis near the normal to said window at its center and adapted to project a conjugate image of said label onto a photosensor strip comprising a plurality of receiver elements which are sequentially scanned electrically, arranged in a row in a sighting plane containing the optical axis and parallel to the longer dimension of said window, and a light source outside said sighting plane emitting towards said label through said window a beam spread out parallel to said longer dimension of said window, in which reader said beam passes through a prismlike lens with edges parallel to said longer dimension of said window and made up of two refractors disposed on respective opposite sides of a slot through which said sighting plane passes so that the emergent beam is substantially symmetrical relative to said sighting plane.
Claim 2
Dependent Claim
171 words
Hand-held barcode label reader having an oblong rear window which is offered up substantially parallel to the label with a longer dimension transverse to the bars, the reader including a lens system with an optical axis near the normal to said window at its center and adapted to project a conjugate image of said label onto a photosensor strip comprising a plurality of receiver elements which are sequentially scanned electrically, arranged in a row in a sighting plane containing the optical axis and parallel to the longer dimension of said window, and a light source outside said sighting plane emitting towards said label through said window a beam spread out parallel to said longer dimension of said window, in which reader said beam passes through a prismlike lens with edges parallel to said longer dimension of said window and made up of two refractors disposed on respective opposite sides of a slot through which said sighting plane passes so that the emergent beam is substantially symmetrical relative to said sighting plane.
Claim 3
Dependent Claim
35 words
Label reader according to claim 1 wherein said two refractors have cylindrical diopters with generatrices parallel to the edges of the prismlike lens so that said emergent beam is substantially parallel to said sighting plane.
Claim 4
Dependent Claim
27 words
Label reader according to claim 1 wherein said light source comprises a strip of emitter elements in a row parallel to said longer dimension of said window.
Claim 5
Dependent Claim
18 words
Label reader according to claim 3 wherein said emitter elements are light-emitting diodes emitting in the far red.
Claim 6
Dependent Claim
16 words
Label reader according to claim 1 wherein said photosensor strip is of the charge-coupled device type.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |