EP0312298A2
Expired / Lapsed
EP
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Bar code reader head
Assignee: Control Module Inc
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Filing: 1988-10-11
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Granted: —
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Expires: 2008-10-11
Abstract
Abstract A bar code reader head having an optical block with cavities (26) formed therein into which various optical elements may be placed without the need for any adjustment thereof. A first illumination source (16), producing any desired spectrum of light, illuminates at least a portion of the bar code (48). A second illumination source (18) may be provided to produce a second spectrum of light. Reflected light passes through a lens (24) in front of which is an aperture slit (46) parallel to the bar code bars. A channel (20) is formed between the lens and a photodetector (28) perpendicular to the light path. If both visible and infrared illumination sources (16/18) are used, visible light is focused at the side of the channel toward the lens and infrared light is focused at the other side of the channel. In the channel is a template (34) having at least one discriminator (54, 56) slit parallel with the slit in front of the lens.
Inventors
- 👤 James Salvatore Bianco
- 👤 Emile Darcy
- 👤 Bernard Drummond
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 13:45
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10712; G06K7/10762
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
116 words
A bar code reader head, comprising: (a) a body; (b) a first illuminating source producing a first spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of a bar code; (c) a first lens disposed within said body to focus said first spectrum of light wavelengths reflected from said bar code, said light being focused at a first focusing plane within said body distant from said first lens; (d) discriminator means disposed within said body and placed at said first focusing plane; and (e) detector means disposed within said body on the side of said discriminator means opposite said first lens to detect light passing through said discriminator means.
Claim 2
Dependent Claim
116 words
A bar code reader head, comprising: (a) a body; (b) a first illuminating source producing a first spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of a bar code; (c) a first lens disposed within said body to focus said first spectrum of light wavelengths reflected from said bar code, said light being focused at a first focusing plane within said body distant from said first lens; (d) discriminator means disposed within said body and placed at said first focusing plane; and (e) detector means disposed within said body on the side of said discriminator means opposite said first lens to detect light passing through said discriminator means.
Claim 3
Dependent Claim
69 words
A bar code reader head, as defined in Claim 1, further comprising: (f) a second illuminating source producing a second spectrum of light wavelengths disposed within said body, in place of said first illuminating source, so as to illuminate at least a portion of said bar code; and (g) said first lens focusing said second spectrum of light wavelengths at a second focusing plane distant from said first lens.
Claim 4
Dependent Claim
71 words
A bar code reader head, as defined in Claim 2, further comprising: (h) a channel formed in said body between and perpendicular to the path of light from said first lens to said detector means, with one wall of said channel lying in said first focusing plane and the opposite wall of said channel lying in said second focusing plane; and (i) said discriminator means is releasably held in said channel.
Claim 5
Dependent Claim
23 words
A bar code reader head, as defined in Claim 2, wherein said discriminator means is moveable between said first and second focusing planes.
Claim 6
Dependent Claim
42 words
A bar code reader head, as defined in Claim 1, wherein said discriminator means comprises a first discriminator slit parallel to the bars on said bar code and disposed in the path of light from said first lens to said detector means.
Claim 7
Dependent Claim
32 words
A bar code reader head, as defined in Claim 5, wherein said discriminator means is movable to place said first discriminator slit at either of said first or said second focusing planes.
Claim 8
Dependent Claim
80 words
A bar code reader head, as defined in Claim 5, wherein said discriminator means comprises at least a second discriminator slit parallel to said bars on said bar code and said discriminator means is movable to place either of said first and second discriminator slits in the path of light from said first lens to said detector means and is movable to place either of said first and second discriminator slits at either of said first and second focusing planes.
Claim 9
Dependent Claim
33 words
A bar code reader head, as defined in Claim 5, wherein said first discriminator slit is defined as a clear line on a black photoemulsion disposed and developed on a first clear film.
Claim 10
Dependent Claim
84 words
A bar code reader head, as defined in Claim 8, wherein said discriminator means comprises: (a) said first clear film; (b) flexible means disposed on one side of said first clear film; (c) a second clear film disposed upon said flexible means; and (d) an open passage defined within said flexible means such that light may pass therethrough from said second clear film to said first discriminator slit; wherein, slight compression of said flexible means will hold said discriminator means releasably within said channel.
Claim 11
Dependent Claim
23 words
A bar code reader head, as defined in Claim 1, further comprising a second lens between said discriminator means and said detector means.
Claim 12
Dependent Claim
38 words
A bar code reader head, as defined in Claim 2, wherein said first spectrum of light wavelengths is in the range of visible light and said second spectrum of light wavelengths is in the range of infrared light.
Claim 13
Dependent Claim
33 words
A bar code reader head, as defined in Claim 2, wherein said first lens focuses both said first and second spectra of light wavelengths at one of said first and second focusing planes.
Claim 14
Dependent Claim
27 words
A bar code reader head, as defined in Claim 2, wherein both said first and second illuminating sources are disposed within said body at the same time.
Claim 15
Dependent Claim
21 words
A bar code reader head, as defined in Claim 1, wherein said body is formed as a side-pull-out injection molded part.
Claim 16
Dependent Claim
19 words
A bar code reader head, as defined in Claim 14, wherein said body is formed of a moldable thermoplastic.
Claim 17
Dependent Claim
30 words
A bar code reader head, as defined in Claim 1, wherein said bar code, said first lens, said discriminator means, and said detector means are disposed along a common axis.
Claim 18
Dependent Claim
33 words
A bar code reader head, as defined in Claim 16, wherein a mirror is disposed between said first lens and said discriminator means thereby to bend about 90 degrees the light path therebetween.
Claim 19
Dependent Claim
27 words
A bar code reader head, as defined in Claim 1, wherein said body has a clear window disposed thereon between said bar code and said first lens.
Claim 20
Dependent Claim
54 words
A bar code reader head, as defined in Claim 1, wherein all said elements disposed within said body may be placed within cavities or channels, accessible from one side of said body, said cavities or channels so fitting said parts that no adjustment thereof is required when or after said elements are so placed.
Claim 21
Dependent Claim
27 words
A bar code reader head, as defined in Claim 19, further comprising a cover fitting over said side of said body, thereby to retain said elements therein.
Claim 22
Dependent Claim
37 words
A bar code reader head, as defined in Claim 1, further comprising an aperture reducing slit disposed in said body between said first lens and said bar code and parallel to the bars on said bar code.
Claim 23
Dependent Claim
28 words
A bar code reader head, as defined in Claim 1, wherein the optical axis of said first lens is substantially orthogonal to the plane of said bar code.
Claim 24
Dependent Claim
36 words
A bar code reader head, as defined in Claim 1, wherein the light from said illuminating source(s) strikes said bar code at an angle of approximately 45 degrees from said optical axis of said first lens.
Claim 25
Dependent Claim
100 words
A bar code reader head, comprising: (a) a body; (b) a first illuminating source producing a first spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of a bar code; (c) a second illuminating source producing a second spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of said bar code; (d) a lens disposed within said body to focus said first spectrum of light wavelengths reflected from said bar code; and (e) detector means disposed within said body to detect light focused by said lens.
Claim 26
Dependent Claim
100 words
A bar code reader head, comprising: (a) a body; (b) a first illuminating source producing a first spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of a bar code; (c) a second illuminating source producing a second spectrum of light wavelengths disposed within said body so as to illuminate at least a portion of said bar code; (d) a lens disposed within said body to focus said first spectrum of light wavelengths reflected from said bar code; and (e) detector means disposed within said body to detect light focused by said lens.
References Cited (Backward Citations)
No citation records indexed.
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