US5363220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffraction device
Assignee: Canon Inc
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Filing: 1993-01-07
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Granted: 1994-11-08
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Expires: 2013-01-07
Abstract
Abstract The present invention provides a diffraction device having a high diffraction efficiency with respect to a wide-band radiation beam. A diffraction device comprises a substrate and a diffraction grating formed on the substrate, wherein the diffraction grating is formed so that a full-width of wavelength at half maximum of a diffraction efficiency of a beam diffracted by the diffraction grating is not less than about 8% of a value of a center wavelength of the diffracted beam.
Inventors
- 👤 Tetsuro Kuwayama
- 👤 Naosato Taniguchi
- 👤 Yoko Yoshinaga
- 👤 Nobuo Kushibiki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1847; G02B5/1857
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
122 words
A head-up display apparatus, comprising: a displaying device for displaying an image; and an optical system for directing a beam indicative of said image from said displaying device to a viewer, said optical system including: a beam combiner; and a relay member for diffracting said beam and making it incident on said beam combiner, at which the beam is rediffracted and directed to the viewer, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said relay member is set to be equal to or greater than 8% of a central wavelength of the wavelength spectrum, and wherein a half-width of a wavelength spectrum of a diffraction efficiency of said beam combiner is smaller than that of said relay member.
Claim 2
Dependent Claim
122 words
A head-up display apparatus, comprising: a displaying device for displaying an image; and an optical system for directing a beam indicative of said image from said displaying device to a viewer, said optical system including: a beam combiner; and a relay member for diffracting said beam and making it incident on said beam combiner, at which the beam is rediffracted and directed to the viewer, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said relay member is set to be equal to or greater than 8% of a central wavelength of the wavelength spectrum, and wherein a half-width of a wavelength spectrum of a diffraction efficiency of said beam combiner is smaller than that of said relay member.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1, wherein said beam combiner comprises volume-phase type hologram.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 2, wherein said volume-phase type hologram causes said beam to be reflectively diffracted.
Claim 5
Dependent Claim
14 words
An apparatus according to claim 3, wherein said member includes a volume-phase type hologram.
Claim 6
Dependent Claim
22 words
An apparatus according to claim 4, wherein said volume-phase type hologram of said relay member causes said beam to be reflectively diffracted.
Claim 7
Dependent Claim
19 words
An apparatus according to claim 5, wherein said volume-phase type hologram of said relay member comprises a polyvinyl carbazole.
Claim 8
Dependent Claim
15 words
An apparatus according to claim 3, wherein said volume-phase type hologram comprises a polyvinyl carbazole.
Claim 9
Independent Claim
136 words
A system for transmitting a beam having a plurality of light wavelength components, comprising: a first optical fiber for supplying the beam; a second optical fiber for receiving the beam; a first member forming a first diffraction grating for receiving and diffracting the beam from said first optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said first diffraction grating is set to be equal to or greater than 8% of a central wavelength of said wavelength spectrum; and a second member forming a second diffraction grating for receiving and diffracting the beam from said first member and directing the beam to said second optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said second diffraction grating is smaller than that of said first diffraction grating.
Claim 10
Independent Claim
136 words
A system for transmitting a beam having a plurality of light wavelength components, comprising: a first optical fiber for supplying the beam; a second optical fiber for receiving the beam; a first member forming a first diffraction grating for receiving and diffracting the beam from said first optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said first diffraction grating is set to be equal to or greater than 8% of a central wavelength of said wavelength spectrum; and a second member forming a second diffraction grating for receiving and diffracting the beam from said first member and directing the beam to said second optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said second diffraction grating is smaller than that of said first diffraction grating.
Claim 11
Dependent Claim
42 words
A system according to claim 8, wherein said second optical fiber has a number of fibers which is the same as the number of light wavelength components, and each said optical fiber selectively receives one of the light wavelength components corresponding thereto.
Claim 12
Dependent Claim
31 words
A system according to claim 8, wherein at least one of said first member or said second member includes a substrate for supporting the diffraction grating forming a volume-phase type hologram.
Claim 13
Dependent Claim
18 words
A system according to claim 10, wherein said volume-phase type hologram causes the beams to be reflectively diffracted.
Claim 14
Dependent Claim
15 words
A system according to claim 10, wherein aid volume-phase type hologram comprises a polyvinyl carbazole.
Claim 15
Independent Claim
145 words
A system for transmitting a beam having a plurality of light wavelength components from a first optical fiber to a second group of optical fibers, said system comprising: a first member forming a first diffraction grating for receiving and diffracting the beam from said first optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said first diffraction grating is set to be equal to or greater than 8% of a central wavelength of said wavelength spectrum; and a second member forming a second diffraction grating for receiving and diffracting the beam from said first member and directing the beam to said second group of optical fibers, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said second diffraction grating is smaller than that of said first diffraction grating is smaller than that of said first diffraction grating.
Claim 16
Independent Claim
145 words
A system for transmitting a beam having a plurality of light wavelength components from a first optical fiber to a second group of optical fibers, said system comprising: a first member forming a first diffraction grating for receiving and diffracting the beam from said first optical fiber, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said first diffraction grating is set to be equal to or greater than 8% of a central wavelength of said wavelength spectrum; and a second member forming a second diffraction grating for receiving and diffracting the beam from said first member and directing the beam to said second group of optical fibers, wherein a half-width of a wavelength spectrum of a diffraction efficiency of said second diffraction grating is smaller than that of said first diffraction grating is smaller than that of said first diffraction grating.
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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) | 1997-11-07 | 1998-05-09 | 1998-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-07 | 2002-05-09 | 2002-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-07 | 2006-05-09 | 2006-11-08 | $7700.00 | Window Closed / Lapsed |