EP0435662A2
Expired / Lapsed
EP
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Hologram scanner and method of recording and reproducing hologram in the hologram scanner
Assignee: Sharp Corp
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Filing: 1990-12-24
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Granted: —
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Expires: 2010-12-24
Abstract
Abstract A hologram scanner includes a reproducing light source (17) for generating a collimated reproducing light beam (15), a hologram disk (12) being adapted to rotate, and a hologram (11) disposed on the hologram disk for deflecting the reproducing light beam by diffraction so as to scan an image surface (13) by the deflected reproducing light beam (16) during a rotation of the hologram disk. The hologram has interference fringes recorded by a mutual interference of an object light of divergent spherical wave and a reference light of divergent spherical wave. The object light is generated by an object light source positioned at a first position apart from a hologram recording plane of the hologram disk, on which the hologram is to be recorded, by a first distance. The reference light is generated by a reference light source positioned at a second position apart from the hologram recording plane by a second distance. The first and second distances are different from each other so that the deflected reproducing light beam is focused on the image surface.
Inventors
- 👤 Tetsuro Toyoshima
- 👤 Tetsuyuki Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:16
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/106
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
184 words
A method of recording and reproducing a hologram in a hologram scanner, comprising the steps of: generating an object light of divergent spherical wave by an object light source disposed at a first position, toward a hologram recording plane of a hologram disk on which a hologram is to be recorded, said first position being apart from said hologram recording plane by a first distance; generating a reference light of divergent spherical wave by a reference light source disposed at a second position, toward said hologram recording plane so as to record said hologram thereon by a mutual interference of said object light and said reference light, said second position being apart from said hologram recording plane by a second distance; and reproducing said hologram by applying a collimated reproducing light beam to said hologram so as to deflect said reproducing light beam by diffraction and scan an image surface by said deflected reproducing light beam while rotating said hologram disk, said first and second distances being different from each other so that said deflected reproducing light beam is focused on said image surface.
Claim 2
Dependent Claim
33 words
A method according to Claim 1, wherein said first and second positions are determined by mathematical programming so as to record said hologram having a desirable focusing power and a desirable deflecting power.
Claim 3
Dependent Claim
169 words
A hologram scanner comprising: a reproducing light source for generating a collimated reproducing light beam; a hologram disk being adapted to rotate; and a hologram disposed on said hologram disk for deflecting said reproducing light beam by diffraction so as to scan an image surface by said deflected reproducing light beam during a rotation of said hologram disk, said hologram having interference fringes recorded by a mutual interference of an object light of divergent spherical wave and a reference light of divergent spherical wave, said object light being generated by an object light source positioned at a first position apart from a hologram recording plane of said hologram disk on which said hologram is to be recorded, by a first distance, said reference light being generated by a reference light source positioned at a second position apart from said hologram recording plane by a second distance, said first and second distances being different from each other so that said deflected reproducing light beam is focused on said image surface.
Claim 4
Dependent Claim
17 words
A hologram scanner according to Claim 3, wherein said reproducing light source comprises a semiconductor laser source.
Claim 5
Independent Claim
137 words
A method of recording and reproducing a hologram in a hologram scanner, comprising the steps of: recording a hologram on a hologram recording plane of a hologram disk by a mutual interference of an object light and a reference light, at least one of which is an aberrational wave, so that said hologram has interference fringes different from quadratic curves; and reproducing said hologram by applying a reproducing light beam to said hologram so as to deflect said reproducing light beam by diffraction and scan an image surface by said deflected reproducing light beam while rotating said hologram disk, said aberrational wave being generated by inputting a spherical wave to an anamorphic lens which power distribution is determined by mathematical programming so that an aberration of said deflected reproducing light beam on said image surface is minimized.
Claim 6
Dependent Claim
31 words
A method according to Claim 5, wherein each of a sagittal plane profile and a meridional plane profile of said anamorphic lens is in a shape of polynominal of higher order.
Claim 7
Dependent Claim
34 words
A method according to Claim 5, wherein each of a sagittal plane profile and a meridional plane profile of said anamorphic lens is in a circular shape, which curvature is different from each other.
Claim 8
Dependent Claim
51 words
A method according to Claim 5, wherein one of a sagittal plane profile and a meridional plane profile of said anamorphic lens is in a circular shape while the other of said sagittal plane profile and said meridional plane profile is in a quadratic curve shape other than a circular shape.
Claim 9
Dependent Claim
54 words
A method according to Claim 5, wherein one of a sagittal plane profile and a meridional plane profile of said anamorphic lens is in a circular shape while the other of said sagittal plane profile and said meridional plane profile is in a shape of polynominal of higher order other than a circular shape.
Claim 10
Dependent Claim
33 words
A method according to Claim 5, wherein each of a sagittal plane profile and a meridional plane profile of said anamorphic lens is in a quadratic curve shape other than a circular shape.
Claim 11
Dependent Claim
20 words
A method according to Claim 5, wherein each of said object light and said reference light comprises an argon laser.
Claim 12
Dependent Claim
127 words
A hologram scanner comprising; a reproducing light source for generating a reproducing light beam; a hologram disk being adapted to rotate; and a hologram disposed on said hologram disk for deflecting said reproducing light beam by diffraction so as to scan an image surface by said deflected reproducing light beam during a rotation of said hologram disk, said hologram having interference fringes different from quadratic curves and recorded by a mutual interference of an object light and a reference light, at least one of which is an aberrational wave, said aberrational wave being generated by inputting a spherical wave to an anamorphic lens which power distribution is determined by mathematical programming so that an aberration of said deflected reproducing light beam on said image surface is minimized.
Claim 13
Dependent Claim
17 words
A hologram scanner according to Claim 12, wherein said reproducing light beam is a collimated light beam.
Claim 14
Dependent Claim
17 words
A hologram scanner according to Claim 12, wherein said reproducing light source comprises a semiconductor laser source.
Claim 15
Independent Claim
146 words
A method of recording and reproducing a hologram in a hologram scanner, comprising the steps of: recording a hologram on a hologram recording plane of a hologram disk by a mutual interference of an object light and a reference light, at least one of which is an aberrational wave, so that said hologram has interference fringes different from quadratic curves; and reproducing said hologram by applying a reproducing light beam to said hologram so as to deflect said reproducing light beam by diffraction and scan an image surface by said deflected reproducing light beam while rotating said hologram disk, said aberrational wave being generated by inputting a spherical wave to a compound optical system including a prism and a spherical lens which parameters in shape are determined by mathematical programming so that an aberration of said deflected reproducing light beam on said image surface is minimized.
Claim 16
Dependent Claim
20 words
A method according to Claim 15, wherein each of said object light and said reference light comprises an argon laser.
Claim 17
Dependent Claim
136 words
A hologram scanner comprising; a reproducing light source for generating a reproducing light beam; a hologram disk being adapted to rotate; and a hologram disposed on said hologram disk for deflecting said reproducing light beam by diffraction so as to scan an image surface by said deflected reproducing light beam during a rotation of said hologram disk, said hologram having interference fringes different from quadratic curves and recorded by a mutual interference of an object light and a reference light, at least one of which is an aberrational wave, said aberrational wave being generated by inputting a spherical wave to a compound optical system including a prism and a spherical lens which parameters in shape are determined by mathematical programming so that an aberration of said deflected reproducing light beam on said image surface is minimized.
Claim 18
Dependent Claim
17 words
A hologram scanner according to Claim 17, wherein said reproducing light beam is a collimated light beam.
Claim 19
Dependent Claim
17 words
A hologram scanner according to Claim 17, wherein said reproducing light source comprises a semiconductor laser source.
Claim 20
Independent Claim
52 words
A method of recording a hologram by mutual interference of an object light and a reference light, wherein at least one of the object light and the reference light is an aberrational wave, so as at least partially to compensate for aberrations of the reproducing beam occurring on reproduction of the hologram.
Claim 21
Independent Claim
93 words
A method of recording a hologram to be reproduced by applying a collimated reproducing beam to the hologram for deflection thereby to form a beam for scanning an image surface, wherein the hologram is recorded by mutual interference of a divergent spherical object light and a divergent spherical reference light, the object and reference lights being generated by an objective and reference source respectively, the objective and reference sources being spaced at different distances from the hologram recording plane so that on reproduction the deflected reproducing beam is focused on the image surface.
References Cited (Backward Citations)
No citation records indexed.
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