US3801182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical scanning apparatus
Assignee: IDENTICON CORP
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Filing: 1972-07-10
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Granted: 1974-04-02
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Expires: 1992-07-10
Abstract
Abstract A polarized light source illuminates a surface having portions of high and low specular reflectivity. A polarization filter transmits reflected light from the surface to a detector polarized orthogonally relative to the incident light from the polarized source.
Inventors
- 👤 P Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:51
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10861; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B27/00; G02B27/28; G11; G11C; G11C13/00; G11C13/04; G11C13/048; G06K2207/00; G06K2207/1012
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
Scanning apparatus for reading encoded labels having a surface of spaced specular reflecting portions painted or inked on nonspecular reflecting portions comprising, a source of radiant energy polarized in a first sense, means for scanning said surface with said polarized radiant energy, means responsive to the energy reflected from said surface for selectively transmitting energy cross-polarized with respect to said first sense polarization, and means for detecting only the latter transmitted radiant energy.
Claim 2
Dependent Claim
73 words
Scanning apparatus for reading encoded labels having a surface of spaced specular reflecting portions painted or inked on nonspecular reflecting portions comprising, a source of radiant energy polarized in a first sense, means for scanning said surface with said polarized radiant energy, means responsive to the energy reflected from said surface for selectively transmitting energy cross-polarized with respect to said first sense polarization, and means for detecting only the latter transmitted radiant energy.
Claim 3
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said radiant energy is incident from a substantially monochromatic source.
Claim 4
Dependent Claim
93 words
Apparatus in accordance with claim 1 wherein said means for scanning comprises a multifaceted rotating reflecting means exchanging light energy through means including a mirror formed with a slit, said first polarizer being interposed between said slit and said light source whereby light from said source passes through said first polarizer and said slit to said reflecting means, said second polarizer being interposed between said mirror and said means for detecting whereby light from said reflecting means is transmitted through said second polarizer to said means for detecting after reflection from said mirror.
Claim 5
Dependent Claim
13 words
Apparatus in accordance with claim 3 wherein said light source is a laser.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |