US5381197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflecting illumination projecting device
Assignee: Pentax Corp
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Filing: 1993-05-24
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Granted: 1995-01-10
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Expires: 2013-05-24
Abstract
Abstract A reflecting illumination projecting device includes a light source which emits illuminating light and a mirror which reflects the illuminating light emitted from the light source. A transmission type image forming portion is provided between the light source and the mirror to form a pattern to be projected, and a projecting lens is provided between the light source and the image forming portion. An optical path separating element is disposed in the vicinity of an exit pupil of the projection lens. The optical path separating element includes a first portion for introducing substantially all of the illuminating light to the projecting lens and a second portion for introducing light reflected by the mirror onto the image projection plane.
Inventors
- 👤 Kazushi Yoshida
- 👤 Ryota Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:16
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3141; H04N9/315; G; G02; G02B; G02B27/00; G02B27/18; G03; G03B; G03B21/00; G03B21/132; H04N9/3167; Y; Y10; Y10S; Y10S353/00; Y10S353/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
139 words
A reflecting illumination projecting device comprising: a light source which emits illuminating light, a transmission type image forming device which is provided in a path of the illuminating light of said light source to form a pattern to be projected, a projecting lens which is provided between said light source and said image forming device to project an image of said transmission type image forming device onto an image projection plane, optical path separating means disposed in the vicinity of an exit pupil of said projecting lens, said optical path separating means comprising a first portion for introducing substantially all illuminating light to said projecting lens and a second portion for introducing light received from said projecting lens onto the image projection plane, and a polarized beam collector located between said light source and said optical path separating means.
Claim 2
Dependent Claim
139 words
A reflecting illumination projecting device comprising: a light source which emits illuminating light, a transmission type image forming device which is provided in a path of the illuminating light of said light source to form a pattern to be projected, a projecting lens which is provided between said light source and said image forming device to project an image of said transmission type image forming device onto an image projection plane, optical path separating means disposed in the vicinity of an exit pupil of said projecting lens, said optical path separating means comprising a first portion for introducing substantially all illuminating light to said projecting lens and a second portion for introducing light received from said projecting lens onto the image projection plane, and a polarized beam collector located between said light source and said optical path separating means.
Claim 3
Dependent Claim
38 words
A reflecting illumination projecting device according to claim 1, further comprising: a mirror which reflects the illuminating light emitted from said light source, said transmission type image forming device being provided between said light source and said mirror.
Claim 4
Dependent Claim
65 words
A reflecting illumination projecting device according to claim 1, wherein said first portion of said optical path separating means comprises a half-size mirror location on one side of an optical axis of said projecting lens, and said second portion comprises a space opposite said half-size mirror, said space being located on a side of said optical axis of said projecting lens opposite said one side.
Claim 5
Dependent Claim
78 words
A reflecting illumination projecting device according to claim 1, wherein said optical path separating means comprises a separating plate located across an entire optical path of said projecting lens, wherein said first portion comprises a total reflection element located on one side of an optical axis of said projecting lens, and said second portion comprises a transmission element, said transmission element being located on a side of said optical axis of said projecting lens opposite said one side.
Claim 6
Dependent Claim
34 words
A reflecting illumination projecting device according to claim 1, said polarized beam collector further comprising: a polarization beam splitter which produces two linear polarization components, and means for gathering the two linear polarization components.
Claim 7
Dependent Claim
23 words
A reflecting illumination projecting device according to claim 5, wherein said means for gathering the two linear polarization components comprises a composite prism.
Claim 8
Dependent Claim
15 words
A reflecting illumination projecting device according to claim 6, wherein said composite prism is wedge-shaped.
Claim 9
Dependent Claim
23 words
A reflecting illumination projecting device according to claim 5, wherein said means for gathering the two linear polarization components comprises a composite mirror.
Claim 10
Dependent Claim
33 words
A reflecting illumination projecting device according to claim 5, wherein said means for gathering the two linear polarization components comprises a composite prism having a flat incident end and a serrated emission end.
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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) | 1998-01-09 | 1998-07-11 | 1999-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-09 | 2002-07-11 | 2003-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-09 | 2006-07-11 | 2007-01-10 | $7700.00 | Window Closed / Lapsed |