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US3883232A
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Random phase plate and optical system incorporating said plate
Assignee: Hitachi Ltd
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Filing: 1973-12-03
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Granted: 1975-05-13
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Expires: 1993-12-03
Abstract
Abstract A random phase plate provides multiple optical paths that can give stepwise random phase shifts varying from more than one wavelength to two, or more than two, spectral components of the transmitted beam, simultaneously.
Inventors
- 👤 Yoshito Tsunoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:37
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G02B5/18; G02B5/1866; G02B5/1871; G03; G03H; G03H1/00; G03H1/04; G03H1/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
81 words
A random phase plate comprising: a plurality of phase shifting elements disposed adjacent one another in a random arrangement, and having a plurality of different effective optical thicknesses, so as to provide random phase shifts to the respective spectral components of a multi-chromatic light beam incident thereon, and wherein the optical thickness of those elements which have the maximum optical thickness among said plurality of elements is an integral multiple of each of the spectral components of said multi-chromatic light beam.
Claim 2
Dependent Claim
81 words
A random phase plate comprising: a plurality of phase shifting elements disposed adjacent one another in a random arrangement, and having a plurality of different effective optical thicknesses, so as to provide random phase shifts to the respective spectral components of a multi-chromatic light beam incident thereon, and wherein the optical thickness of those elements which have the maximum optical thickness among said plurality of elements is an integral multiple of each of the spectral components of said multi-chromatic light beam.
Claim 3
Dependent Claim
33 words
A random phase plate according to claim 1, wherein said integral multiple is the lowest possible integral multiple of each of said spectral components, so that said maximum optical thickness is effectively minimized.
Claim 4
Dependent Claim
22 words
A random phase plate according to claim 1, wherein said plurality of elements comprises a randomly distributed two-dimensional array of said elements.
Claim 5
Dependent Claim
43 words
A random phase plate according to claim 3, wherein said array of elements is made up of a light transparent support base upon which a plurality of unit areas of material having differeNt optical thicknesses corresponding to each of said elements are disposed.
References Cited (Backward Citations)
US3604778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |