Patent EP0382568A2 successfully refreshed from Google Patents.
US5638142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial light modulator system including a plurality of tiltable mirror devices and reflective means for equalizing the number of reflections from the tiltable mirror devices
Assignee: RANK NEMO (DPL) Ltd (FORMERLY DIGITAL PROJECTION LIMITED)
•
Filing: 1993-04-01
•
Granted: 1997-06-10
•
Expires: 2013-04-01
Abstract
Abstract A spatial light modulator system includes a multi-wavelength light source and three spatial light modulators, two dichroic mirrors are arranged in the light path between the light source and the spatial light modulators so as to direct light within a different wavelength band onto all but one of the spatial light modulators, light to the third spatial light modulator passing through the dichroic mirror onto the third spatial light modulator. Spatially modulated light reflected from the spatial light modulators is combined by the two dichroic mirrors to produce a multi-wavelength spatially modulated output beam. In order to equalize the number of reflections uundergone by spatially modulated light from all the spatial light modulators a reflector is provided in the optical path between the third spatial light modulator and the output beam.
Inventors
- 👤 Martin Kavanagh
- 👤 Raymond G. Fielding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:44
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02B; G02B26/00; G02B26/08; G02B26/0816; G02B26/0833; G02B27/00; G02B27/0025; G09; G09F; G09F9/00; G09F9/30; G09F9/37; G09F9/372
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A spatial light modulator system comprising: a multi wavelength light source; a plurality of tiltable mirror devices; a plurality of dichroic mirror elements arranged in the light path between the light source and the tiltable mirror devices so as to reflect light within a different wavelength band onto all but one of the tiltable mirror devices, light to said one tiltable mirror devices passing through the dichroic mirror elements onto said one tiltable mirror device and means for combining the modulated light from the tiltable mirror devices, said system being characterized in including a reflective means provided in the optical path from said one of the tiltable mirror devices in order to equalize the number of reflections undergone by modulated light from all of the tiltable mirror devices.
Claim 2
Dependent Claim
128 words
A spatial light modulator system comprising: a multi wavelength light source; a plurality of tiltable mirror devices; a plurality of dichroic mirror elements arranged in the light path between the light source and the tiltable mirror devices so as to reflect light within a different wavelength band onto all but one of the tiltable mirror devices, light to said one tiltable mirror devices passing through the dichroic mirror elements onto said one tiltable mirror device and means for combining the modulated light from the tiltable mirror devices, said system being characterized in including a reflective means provided in the optical path from said one of the tiltable mirror devices in order to equalize the number of reflections undergone by modulated light from all of the tiltable mirror devices.
Claim 3
Dependent Claim
19 words
A system according to claim 1, in which there are three tiltable mirror devices and two dichroic mirror elements.
Claim 4
Dependent Claim
79 words
A system according to claim 1, in which each dichroic mirror element is provided on an optically transmissive component and in which the optically transmissive components age angled with respect to the optical axis of the system so as to introduce distortion into the modulated combined beam, the system further including at least one transmissive component of optical characteristics and set at an angle with respect to the optical axis of the system so as to cancel said distortion.
Claim 5
Dependent Claim
42 words
A system according to claim 3, in which there are three transmissive components each of equal optical path length, and angled with respect to the optical axis of the system so as mutually to compensate for distortions produced by the transmissive elements.
Claim 6
Dependent Claim
13 words
A display system including a spatial light modulator system according to claim 1.
Claim 7
Dependent Claim
116 words
A spatial light modulator system comprising: a light source; a plurality of tiltable mirror devices; a plurality of dichroic mirror elements arranged in the light path between the light source and the tiltable mirror devices, and means for combining the modulated light from the tiltable mirror devices, wherein each dichroic mirror element is provided on an optically transmissive component an in which the optically transmissive components are angled with respect to the optical axis of the system so as to introduce distortion into the modulated combined beam, and at least one further transmissive component of optical characteristics set at an angle with respect to the optical axis of the system so as to cancel said distortion.
Claim 8
Dependent Claim
116 words
A spatial light modulator system comprising: a light source; a plurality of tiltable mirror devices; a plurality of dichroic mirror elements arranged in the light path between the light source and the tiltable mirror devices, and means for combining the modulated light from the tiltable mirror devices, wherein each dichroic mirror element is provided on an optically transmissive component an in which the optically transmissive components are angled with respect to the optical axis of the system so as to introduce distortion into the modulated combined beam, and at least one further transmissive component of optical characteristics set at an angle with respect to the optical axis of the system so as to cancel said distortion.
Claim 9
Dependent Claim
13 words
A display system including a spatial light modulator system according to claim 6.
References Cited (Backward Citations)
GB2046937A
Cited
EP0139991A2
Cited
US4680579A
Cited
US4541688A
Cited
JPS6113885A
Cited
JPS61177079A
Cited
EP0198655A2
Cited
EP0303898A1
Cited
WO1989005470A1
Cited
DE3829598A1
Cited
EP0363767A1
Cited
EP0401912A2
Cited
EP0418947A1
Cited
WO1991015923A1
Cited
WO1992001356A1
Cited
GB2252173A
Cited
US5305146A
Cited
JPH05249408A
Cited
JPH05281511A
Cited
JPH06138430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-09 | 2000-12-09 | 2001-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-09 | 2004-12-09 | 2005-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-09 | 2008-12-09 | 2009-06-10 | $7700.00 | Window Closed / Lapsed |