US4155630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speckle elimination by random spatial phase modulation
Assignee: University of Delaware
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Filing: 1977-11-17
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Granted: 1979-05-22
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Expires: 1997-11-17
Abstract
Abstract A process and apparatus for improving image creation in a coherent light imagery system which involves directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation. More particularly, this invention creates the rocking motion by applying a combination of voltages to three independent piezo-electric crystals upon which the mirror is mounted.
Inventors
- 👤 Charles C. Ih
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:16
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/48; G02B26/00; G02B26/06; G02B26/08; G02B26/0816; G02B26/0825; G03; G03H; G03H1/00; G03H1/22; G03H1/2286; G03H2222/00; G03H2222/20; G03H2222/22; H; H01; H01S; H01S3/00; H01S3/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A process for improving image creation by speckle elimination in a coherent light imagery system which comprises directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation.
Claim 2
Dependent Claim
55 words
A process for improving image creation by speckle elimination in a coherent light imagery system which comprises directing diffused laser light onto a mirror having a rocking motion that will cause the reflected rays to sweep a two-dimensional area and focusing the reflected light through a diffuser before collimating same for use in image creation.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the rocking motion is created by applying a combination of voltages to three independent piezo-electric crystals upon which the mirror is mounted.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the rocking motion of the mirror causes the reflected rays to scan in a circular pattern.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the rocking motion of the mirror causes the reflected rays to scan in a spiral pattern.
Claim 6
Independent Claim
73 words
An apparatus for improving image creation by speckle elimination using coherent light comprising an initial diffuser and a final diffuser, means for imaging the initial diffuser on the final diffuser, a mirror interposed in the path of the light between the initial diffuser and the final diffuser and mounted on three independent piezo-electric crystals and means for independently applying voltages to said crystals to cause the mirror to have a three-dimensional rocking motion.
Claim 7
Independent Claim
73 words
An apparatus for improving image creation by speckle elimination using coherent light comprising an initial diffuser and a final diffuser, means for imaging the initial diffuser on the final diffuser, a mirror interposed in the path of the light between the initial diffuser and the final diffuser and mounted on three independent piezo-electric crystals and means for independently applying voltages to said crystals to cause the mirror to have a three-dimensional rocking motion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-21 | 1982-11-20 | 1983-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-21 | 1986-11-20 | 1987-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-21 | 1990-11-20 | 1991-05-22 | $7700.00 | Window Closed / Lapsed |