US4655541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hologram scanner
Assignee: Fujitsu Ltd
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Filing: 1984-11-28
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Granted: 1987-04-07
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Expires: 2004-11-28
Abstract
Abstract A hologram scanner includes a laser source, a rotary body having a rotational axis at least one hologram facet arranged on the rotary body for diffracting a laser beam from the laser source to scan an object and receive the scattered light from the object for detection thereof, a motor means for driving the rotary body, and an optical detector for detecting the scattered light received and diffracted by the hologram facet. The hologram facet is inclined with respect to the rotational axis of the rotary body.
Inventors
- 👤 Kozo Yamazaki
- 👤 Fumio Yamagishi
- 👤 Hiroyuki Ikeda
- 👤 Takefumi Inagaki
- 👤 Ichiro Sebata
- 👤 Shunji Kitagawa
- 👤 Masayuki Kato
- 👤 Toshiyuki Ichikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:46
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10861; G06K7/10871; G02B26/106
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
107 words
A hologram scanner comprising: a laser source for providing a laser beam; a rotary body having a rotational axis; at least one hologram facet arranged on said rotary body for diffracting said laser beam and for receiving and diffracting the scattered light from said object, said hologram facet being inclined with respect to said rotational axis of said rotary body; motor means for driving said rotary body; and an optical detector for detecting the scattered light received and diffracted by said hologram facet, wherein said rotary body comprises means for converging said scattered light incoming through said hologram facet to lead the light to said optical detector.
Claim 2
Dependent Claim
107 words
A hologram scanner comprising: a laser source for providing a laser beam; a rotary body having a rotational axis; at least one hologram facet arranged on said rotary body for diffracting said laser beam and for receiving and diffracting the scattered light from said object, said hologram facet being inclined with respect to said rotational axis of said rotary body; motor means for driving said rotary body; and an optical detector for detecting the scattered light received and diffracted by said hologram facet, wherein said rotary body comprises means for converging said scattered light incoming through said hologram facet to lead the light to said optical detector.
Claim 3
Dependent Claim
38 words
A hologram scanner according to claim 1, comprising two of said hologram facets, said rotary body being cylindrical, wherein a wedge shaped portion is formed by said two hologram facets at an end of said cylindrical rotary body.
Claim 4
Dependent Claim
37 words
A hologram scanner according to claim 1, comprising at least three of said hologram facets, said rotary body comprising a cylinder, wherein said at least three hologram facts form a pyramid at an end of said cylinder.
Claim 5
Dependent Claim
39 words
A hologram scanner according to claim 1, comprising at least three of said hologram facets, said rotary body comprising a polygonal pillar, wherein said at least three hologram facets form a pyramid at an end of said polygonal pillar.
Claim 6
Dependent Claim
45 words
A hologram scanner according to any one of claims 1 to 4, wherein the laser beam is introduced into said rotary body through an opening at an end of said rotary body, reflected within said rotary body, and emitted therefrom through said each hologram facet.
Claim 7
Dependent Claim
56 words
A hologram scanner according to any one of claims 2 to 4, wherein the laser beam is introduced into said rotary body successively through each said hologram facet, penetrates straight therethrough, is reflected within said rotary body and emitted therefrom through a different hologram facet, as a result of being diffracted by said different hologram facet.
Claim 8
Dependent Claim
40 words
A hologram scanner according to any one of claims 1 to 4, wherein the laser beam is introduced into said rotary body through a side wall thereof, reflected within said rotary body, and emitted therefrom through each said hologram facet.
Claim 9
Dependent Claim
25 words
A hologram scanner according to any one of claims 1 to 4, wherein the laser beam passes through a hollow shaft of the rotary body.
Claim 10
Dependent Claim
31 words
A hologram scanner according to any one of claims 1 to 4, wherein the laser beam is emitted from the rotary body in the direction perpendicular to the rotational axis thereof.
Claim 11
Dependent Claim
30 words
A hologram scanner according to claim 1, said rotary body comprising a cylindrical body, wherein only said one inclined hologram facet is disposed at an end of said cylindrical body.
Claim 12
Dependent Claim
32 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein said at least one hologram facet comprises at least two hologram facet elements having different diffraction directions.
Claim 13
Dependent Claim
33 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein the Bragg plane of the hologram of each said hologram facet is perpendicular to the respective surface thereof.
Claim 14
Dependent Claim
57 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein said rotary body comprises means for changing the location of the incidence point of the laser beam on said at least one hologram facet, with respect to an axis of rotation of said rotary body, during each rotation of said rotary body.
Claim 15
Dependent Claim
25 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein said rotary body constitutes a rotor of said motor means.
Claim 16
Dependent Claim
35 words
A hologram scanner according to claim 14, wherein said rotary body is rotatably attached to a hollow shaft which constitutes a stator of said motor means, and electric lines are disposed through said hollow shaft.
Claim 17
Dependent Claim
36 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein the rotary shaft of said rotary body is disposed within the inside of said rotary body along the full length thereof.
Claim 18
Dependent Claim
31 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein optical means for condensing the scattered light is disposed behind said at least one hologram facet.
Claim 19
Dependent Claim
32 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein a hologram for condensing the scattered light is formed on a side wall of said rotary body.
Claim 20
Dependent Claim
32 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein the scattered light has a converging point at an opening at an end of said rotary body.
Claim 21
Dependent Claim
41 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein the motor means, the rotary body, the laser source, and the optical detector are mounted on one common frame so as to constitute one scanning module.
Claim 22
Dependent Claim
17 words
A hologram scanner according to claim 20, wherein said scanning module is installed in a bar-code reader.
Claim 23
Dependent Claim
28 words
A hologram scanner according to any one of claims 1 to 4 or 10, wherein the inclination angle of said at least one hologram facet is 45 degrees.
Claim 24
Dependent Claim
25 words
A hologram scanner according to claim 10, wherein said one hologram facet diffracts said scattered light so as to focus it on said optical detector.
Claim 25
Dependent Claim
53 words
A hologram scanner according to claim 1, wherein said at least one hologram facet converts said scattered light from a spherical wave to a plane wave, and said hologram scanner includes a hologram that is oriented perpendicularly to the axis of the rotary body for focusing said plane wave onto said optical detector.
References Cited (Backward Citations)
US4165464A
Cited
US4239326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |