US5387991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarization converting device and polarized-light illuminating system using the device and image display unit using the device
Assignee: Canon Inc
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Filing: 1992-12-09
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Granted: 1995-02-07
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Expires: 2012-12-09
Abstract
Abstract A polarization converting device for converting a light from a light source into a polarized light comprises a first prism having a first slant plane for receiving the light from the light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which the first light exits, and a second emergent surface from which the second light exits, a second prism having an incident surface opposed to the second emergent surface of the first prism, a second slant plane for reflecting and deflecting the second light from the incident surface so as to direct it to an optical path almost parallel to that of the first light, and a third emergent surface from which the second light reflected from the second slant plane exits, and a transparent layer carried between the second emergent surface of the first prism and the incident surface of the second prism, the transparent layer having a smaller refractive index than the first prism.
Inventors
- 👤 Hideaki Mitsutake
- 👤 Shigeru Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/13362; G02B; G02B27/00; G02B27/28; G02B27/283; G02F1/133528; G02F1/133536; G02F1/13355
Claims Analysis
Total Claims: 67
Claim 1
Independent Claim
163 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 2
Independent Claim
163 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 3
Dependent Claim
15 words
A device according to claim 1, wherein said transparent layer includes a thin air layer.
Claim 4
Dependent Claim
15 words
A device according to claim 1, wherein said transparent layer includes an optical thin film.
Claim 5
Dependent Claim
16 words
A device according to claim 3, wherein said optical thin film has a multi-layer film structure.
Claim 6
Dependent Claim
41 words
A device according to claim 1, further comprising a polarized plane modulation member on at least one optical path of said first light and said second light to make polarized planes for said first light and said second light almost coincident.
Claim 7
Dependent Claim
53 words
A device according to claim 5, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 8
Dependent Claim
29 words
A device according to claim 6, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 9
Dependent Claim
15 words
A device according to claim 6, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 10
Dependent Claim
16 words
A device according to claim 6, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 11
Independent Claim
145 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits, and wherein said second prism has a smaller refractive index than said first prism.
Claim 12
Independent Claim
145 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits, and wherein said second prism has a smaller refractive index than said first prism.
Claim 13
Dependent Claim
41 words
A device according to claim 10, further comprising a polarized plane modulation member on at least one optical path of said first light and said second light to make polarized planes for said first light and said second light almost coincident.
Claim 14
Dependent Claim
53 words
A device according to claim 11, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 15
Dependent Claim
29 words
A device according to claim 12, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 16
Dependent Claim
15 words
A device according to claim 12, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 17
Dependent Claim
16 words
A device according to claim 12, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 18
Independent Claim
198 words
A device for converting a light from a light source into a polarized light, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 19
Independent Claim
198 words
A device for converting a light from a light source into a polarized light, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 20
Dependent Claim
15 words
A device according to claim 16, wherein said transparent layer includes a thin air layer.
Claim 21
Dependent Claim
15 words
A device according to claim 16, wherein said transparent layer includes an optical thin film.
Claim 22
Dependent Claim
16 words
A device according to claim 18, wherein said optical thin film has a multi-layer film structure.
Claim 23
Dependent Claim
53 words
A device according to claim 16, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 24
Dependent Claim
29 words
A device according to claim 20, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 25
Dependent Claim
15 words
A device according to claim 20, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 26
Dependent Claim
16 words
A device according to claim 20, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 27
Dependent Claim
41 words
A device according to claim 16, further comprising an extinction filter provided on one optical path of said first light and said second light to make the intensity of said first light and said second light almost coincident with each other.
Claim 28
Dependent Claim
40 words
A device according to claim 16, further comprising a light absorption material mixed into one of said first prism and said second prism to make the intensity of said first light and said second light almost coincident with each other.
Claim 29
Dependent Claim
170 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plant exits, wherein said second prism has a smaller refractive index than said first prism; and modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident.
Claim 30
Dependent Claim
170 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plant exits, wherein said second prism has a smaller refractive index than said first prism; and modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident.
Claim 31
Dependent Claim
53 words
A device according to claim 26, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 32
Dependent Claim
29 words
A device according to claim 27, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 33
Dependent Claim
15 words
A device according to claim 27, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 34
Dependent Claim
16 words
A device according to claim 27, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 35
Dependent Claim
42 words
A device according to claim 26, further comprising a light attenuation filter provided on one optical path of said first light and said second light to make the intensity of said first light and said second light almost coincident with each other.
Claim 36
Dependent Claim
40 words
A device according to claim 26, further comprising a light absorption material mixed into one of said first prism and said second prism to make the intensity of said first light and said second light almost coincident with each other.
Claim 37
Dependent Claim
213 words
An image display unit comprising: a light source; an illumination optical system including, a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; and a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 38
Dependent Claim
213 words
An image display unit comprising: a light source; an illumination optical system including, a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; and a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 39
Dependent Claim
20 words
A unit according to claim 33, further comprising a projecting optical system for projecting said image on to a screen.
Claim 40
Dependent Claim
15 words
A unit according to claim 33, wherein said transparent layer includes a thin air layer.
Claim 41
Dependent Claim
15 words
A unit according to claim 33, wherein said transparent layer includes an optical thin film.
Claim 42
Dependent Claim
16 words
A unit according to claim 36, wherein said optical thin film has a multi-layer film structure.
Claim 43
Dependent Claim
53 words
A unit according to claim 33, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 44
Dependent Claim
29 words
A unit according to claim 38, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 45
Dependent Claim
15 words
A unit according to claim 38, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 46
Dependent Claim
16 words
A unit according to claim 38, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 47
Dependent Claim
41 words
A unit according to claim 38, further comprising an extinction filter provided on one optical path of said first light and said second light to make the intensity of said first light and said second light almost coincident with each other.
Claim 48
Dependent Claim
40 words
A unit according to claim 38, further comprising a light absorption material mixed into one of said first prism and said second prism to make the intensity of said first light and said second light almost coincident with each other.
Claim 49
Dependent Claim
196 words
An image display unit comprising: a light source; an illumination optical system including, a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; and a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected at said second slant plane exits, and wherein said second prism has a smaller refractive index than said first prism; modulation means for modulating at least one polarized plane of said first light and said second light to make the .polarized plane of said first light and said second light almost coincident; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 50
Dependent Claim
196 words
An image display unit comprising: a light source; an illumination optical system including, a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; and a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path almost parallel to that of said first light, and a third emergent surface from which said second light reflected at said second slant plane exits, and wherein said second prism has a smaller refractive index than said first prism; modulation means for modulating at least one polarized plane of said first light and said second light to make the .polarized plane of said first light and said second light almost coincident; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 51
Dependent Claim
20 words
A unit according to claim 44, further comprising a projecting optical system for projecting said image on to a screen.
Claim 52
Dependent Claim
53 words
A unit according to claim 44, wherein said modulation member comprises a 1/2 wavelength plate, said 1/2 wavelength plate being provided on one optical path of said first light and said second light, and allowing a polarized direction of one of said first light and said second light to be rotated approximately 90°.
Claim 53
Dependent Claim
29 words
A unit according to claim 46, wherein said 1/2 wavelength plate comprises a 1/4 wavelength plate and a mirror to rotate a polarized direction while reflecting said one light.
Claim 54
Dependent Claim
15 words
A unit according to claim 46, wherein said 1/2 wavelength plate comprises a birefringent crystal.
Claim 55
Dependent Claim
16 words
A unit according to claim 46, wherein said 1/2 wavelength plate comprises a liquid crystal element.
Claim 56
Dependent Claim
41 words
A unit according to claim 45, further comprising an extinction filter provided on one optical path of said first light and said second light to make the intensity of said first light and said second light almost coincident with each other.
Claim 57
Dependent Claim
40 words
A unit according to claim 45, further comprising a light absorption material mixed into one of said first prism and said second prism to make the intensity of said first light and said second light almost coincident with each other.
Claim 58
Independent Claim
148 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path substantially parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits, wherein said second prism has a refractive index which is different from that of said first prism.
Claim 59
Independent Claim
148 words
A device for converting a light from a light source into a polarized light, comprising: a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path substantially parallel to that of said first light, and a third emergent surface from which said second light reflected from said second slant plane exits, wherein said second prism has a refractive index which is different from that of said first prism.
Claim 60
Dependent Claim
196 words
An image display unit comprising: a light source; an illuminating optical system including, a first prism having a first slant plane for receiving light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path substantially parallel to that of said first light, and a third emergent surface from which said second light reflected as said second slant plane exits, said second prism having a refractive index which is different from that of said first prism; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized planes of said first light and said second light substantially coincident; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 61
Dependent Claim
196 words
An image display unit comprising: a light source; an illuminating optical system including, a first prism having a first slant plane for receiving light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface so as to direct it to an optical path substantially parallel to that of said first light, and a third emergent surface from which said second light reflected as said second slant plane exits, said second prism having a refractive index which is different from that of said first prism; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized planes of said first light and said second light substantially coincident; and means for producing an image by modulating said first light and said second light from said illuminating optical system.
Claim 62
Dependent Claim
172 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 63
Dependent Claim
172 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and a second emergent surface from which said second light exits; a second prism having an incident surface opposed to said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface, and a third emergent surface from which said second light reflected from said second slant plane exits; modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident; and a transparent layer provided between said second emergent surface of said first prism and said incident surface of said second prism, said transparent layer having a smaller refractive index than said first prism.
Claim 64
Dependent Claim
157 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface, and a third emergent surface from which said second light reflected from said second slant plane exits; wherein said second prism has a refractive index which is different from that of said first prism; and modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident.
Claim 65
Dependent Claim
157 words
A polarized light illuminating system, comprising: a light source; a first prism having a first slant plane for receiving the light from said light source and dividing it into first and second lights with their polarized planes orthogonal, a first emergent surface from which said first light exits, and second emergent surface from which said second light exits; a second prism having an incident surface substantially in contact with said second emergent surface of said first prism, a second slant plane for reflecting said second light from said incident surface, and a third emergent surface from which said second light reflected from said second slant plane exits; wherein said second prism has a refractive index which is different from that of said first prism; and modulation means for modulating at least one polarized plane of said first light and said second light to make the polarized plane of said first light and said second light almost coincident.
Claim 66
Dependent Claim
125 words
A polarized light illuminating system, comprising: a light source; a polarization converting unit provided with a first prism at said light source side and a second prism at a illuminated object side on an optical path shaped by said light source wherein said polarization converting unit divides a light from said light source into a first polarized light and a second polarized light which lie in different polarized states to each other, makes a polarized state of said first polarized condition coincide with a polarized state of said second polarized condition and illuminates said illuminated object with said second polarized light; and a transparent layer provided on a surface of said second prism, said transparent layer having a smaller refractive index than said second prism.
Claim 67
Dependent Claim
125 words
A polarized light illuminating system, comprising: a light source; a polarization converting unit provided with a first prism at said light source side and a second prism at a illuminated object side on an optical path shaped by said light source wherein said polarization converting unit divides a light from said light source into a first polarized light and a second polarized light which lie in different polarized states to each other, makes a polarized state of said first polarized condition coincide with a polarized state of said second polarized condition and illuminates said illuminated object with said second polarized light; and a transparent layer provided on a surface of said second prism, said transparent layer having a smaller refractive index than said second prism.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1998-02-06 | 1998-08-08 | 1999-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-06 | 2002-08-08 | 2003-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-06 | 2006-08-08 | 2007-02-07 | $7700.00 | Window Closed / Lapsed |