Diffraction grating for optical scanning
First Claim
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1. A diffraction grating system for optical scanning, comprising:
- a plurality of diffraction gratings arranged on a peripheral edge portion of a disk scanner, each of said plurality of diffraction gratings further comprising;
a plurality of grating rings disposed concentrically in a plane,said plurality of grating rings being provided at positions such that their radii r are selected so that a function φ
(r) of r satisfies the following differential equation and initial conditions, ##EQU16## where λ
is the wavelength of a scanning light beam, f is the focal length of each said diffraction grating, r is the radius from the center of each said diffraction grating, M is the distance from each said diffraction grating to a scanning surface expressed as a multiple of the focal length f, and moreover the relation
space="preserve" listing-type="equation">φ
(r)=n+φ
(0)
space="preserve" listing-type="equation">n=0, 1, 2, 3, . . .
space="preserve" listing-type="equation">(n is a non-negative integer) is satisfied.
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Abstract
A diffraction grating comprises the plurality of grating rings provided at positions such that their radii r are selected so that a function φ(r) of r satisfies the following differential equation and initial conditions, ##EQU1## where λ is the wavelength of a scanning light beam, f is the focal length of the diffraction grating, r is the radius from the center of diffraction grating, M is the distance from the diffraction grating to a scanning surface expressed as a multiple of the focal length f, and moreover the relation
φ(r)=n+φ(0)
n=0, 1, 2, . . .
(n is a non-negative integer)
is satisfied.
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Citations
1 Claim
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1. A diffraction grating system for optical scanning, comprising:
-
a plurality of diffraction gratings arranged on a peripheral edge portion of a disk scanner, each of said plurality of diffraction gratings further comprising; a plurality of grating rings disposed concentrically in a plane, said plurality of grating rings being provided at positions such that their radii r are selected so that a function φ
(r) of r satisfies the following differential equation and initial conditions, ##EQU16## where λ
is the wavelength of a scanning light beam, f is the focal length of each said diffraction grating, r is the radius from the center of each said diffraction grating, M is the distance from each said diffraction grating to a scanning surface expressed as a multiple of the focal length f, and moreover the relation
space="preserve" listing-type="equation">φ
(r)=n+φ
(0)
space="preserve" listing-type="equation">n=0, 1, 2, 3, . . .
space="preserve" listing-type="equation">(n is a non-negative integer)is satisfied.
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Specification
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Current AssigneeKabushiki Kaisha Square Enix
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Original AssigneeKabushiki Kaisha Square Enix
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InventorsHibino, Kenichi
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Primary Examiner(s)Arnold, Bruce Y.
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Assistant Examiner(s)PARSONS, DAVID
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Application NumberUS07/713,514Time in Patent Office258 DaysField of Search350/3.71, 350/3.72, 350/6.2, 350/162.16, 350/162.2, 350/162.22, 350/6.9US Class Current359/211.6CPC Class CodesG02B 26/106 having diffraction gratings...
