Patent US1602664A successfully refreshed from Google Patents.
US5164854A
Expired / Lapsed
US
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Polarization converter for converting unpolarized light to linearly polarized light
Assignee: Victor Company of Japan Ltd
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Filing: 1991-07-26
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Granted: 1992-11-17
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Expires: 2011-07-26
Abstract
Abstract There is provided a polarization converter for producing a beam of linearly polarized light from a randomly polarized light. The randomly polarized light is separated into a first polarized light which is projected in a first predetermined direction and a second polarized light having a predetermined angular relationship with the first polarized light. The second polarized light is converted into a third polarized light a polarization of which is identical to that of the first polarized light. By providing a predetermined two-dimensional positional relationship between the first and third polarized lights, the beam of linearly polarized light is produced and advanced on the outside of the converter in a second predetermined direction.
Inventors
- 👤 Itsuo Takanashi
- 👤 Shintaro Nakagaki
- 👤 Ichiro Negishi
- 👤 Tetsuji Suzuki
- 👤 Fujiko Tatsumi
- 👤 Ryusaku Takahashi
- 👤 Keiichi Maeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:33
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/28; G02B27/283; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/135; G02F1/1333; G02F1/1335; G02F1/133528; G02F1/133536
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
202 words
A display system for displaying an image on a screen, comprising: a light source for generating a randomly polarized light; first means for separating the randomly polarized light into first and second polarized lights so as to have a predetermined angular relationship with each other; second means for converting the second polarized light into a third polarized light a polarization of which is identical to that of the first polarized light and projecting the third polarized light in a predetermined direction; third means for directing the first polarized light towards a predetermined position so that the first polarized light and third polarized light projected in the predetermined direction converge on the predetermined position; modulation means for modulating the first and third polarized lights converging on the predetermined position in accordance with the image; lens means for magnifying the image included in the first and third polarized lights thus modulated by a predetermined magnitude; and guide means having pinholes, for projecting the first and third polarized lights including the image thus magnified onto the screen in a way that the first and third polarized lights including the image thus magnified pass through the pinholes and converge on a specific position on the screen.
Claim 2
Dependent Claim
202 words
A display system for displaying an image on a screen, comprising: a light source for generating a randomly polarized light; first means for separating the randomly polarized light into first and second polarized lights so as to have a predetermined angular relationship with each other; second means for converting the second polarized light into a third polarized light a polarization of which is identical to that of the first polarized light and projecting the third polarized light in a predetermined direction; third means for directing the first polarized light towards a predetermined position so that the first polarized light and third polarized light projected in the predetermined direction converge on the predetermined position; modulation means for modulating the first and third polarized lights converging on the predetermined position in accordance with the image; lens means for magnifying the image included in the first and third polarized lights thus modulated by a predetermined magnitude; and guide means having pinholes, for projecting the first and third polarized lights including the image thus magnified onto the screen in a way that the first and third polarized lights including the image thus magnified pass through the pinholes and converge on a specific position on the screen.
Claim 3
Dependent Claim
213 words
A display system for displaying an image on a screen, comprising: a light source for generating a randomly polarized light; first means for separating the randomly polarized light into first and second polarized lights so as to have a predetermined angular relationship with each other; second means for converting the second polarized light into a third polarized light a polarization of which is identical to that of the first polarized light and projecting the third polarized light in a first predetermined direction; third means for directing the first polarized light in a second predetermined direction different from the first predetermined direction; fourth means for making the first and third polarized lights directed in the first and second directions respectively converge on a predetermined position; modulation means for modulating the first and third polarized lights converging on the predetermined position in accordance with the image; lens means for magnifying the image included in the first and third polarized lights thus modulated by a predetermined magnitude; and guide means having pinholes, for projecting the first and third polarized lights including the image thus magnified onto the screen in a way that the first and third polarized lights including the image thus magnified pass through the pinholes and converge on a specific position on the screen.
Claim 4
Dependent Claim
213 words
A display system for displaying an image on a screen, comprising: a light source for generating a randomly polarized light; first means for separating the randomly polarized light into first and second polarized lights so as to have a predetermined angular relationship with each other; second means for converting the second polarized light into a third polarized light a polarization of which is identical to that of the first polarized light and projecting the third polarized light in a first predetermined direction; third means for directing the first polarized light in a second predetermined direction different from the first predetermined direction; fourth means for making the first and third polarized lights directed in the first and second directions respectively converge on a predetermined position; modulation means for modulating the first and third polarized lights converging on the predetermined position in accordance with the image; lens means for magnifying the image included in the first and third polarized lights thus modulated by a predetermined magnitude; and guide means having pinholes, for projecting the first and third polarized lights including the image thus magnified onto the screen in a way that the first and third polarized lights including the image thus magnified pass through the pinholes and converge on a specific position on the screen.
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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) | 1995-11-17 | 1996-05-18 | 1996-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-17 | 2000-05-18 | 2000-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-17 | 2004-05-18 | 2004-11-17 | $7700.00 | Window Closed / Lapsed |