US4427265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion plate
Assignee: Canon Inc
•
Filing: 1981-06-18
•
Granted: 1984-01-24
•
Expires: 2001-06-18
Abstract
Abstract This application relates to a diffusion plate having microlens-like curved surfaces of a size of 10 to several tens of μm arranged periodically in two dimensions on the surface of the substrate thereof. Curved surfaces are formed between the microlens-like curved surfaces. Further, irregularly arranged minute concave and/or convex surfaces are formed on the microlens-like curved surfaces.
Inventors
- 👤 Takashi Suzuki
- 👤 Kiyoshi Iizuka
- 👤 Keiji Ohtaka
- 👤 Hidemasa Mizutani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:03
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B5/0205; G02B5/0252; G02B5/0268; G02B5/0273; G02B5/0278; G03; G03B; G03B13/00; G03B13/18; G03B13/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
A diffusion plate having the following constructions formed on the surface of the substrate thereof: microlens-like curved surfaces of a size of the order of 10 to several tens of μm arranged regularly and two-dimensionally; curved surfaces between said microlens-like curved surface; and minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces.
Claim 2
Dependent Claim
53 words
A diffusion plate having the following constructions formed on the surface of the substrate thereof: microlens-like curved surfaces of a size of the order of 10 to several tens of μm arranged regularly and two-dimensionally; curved surfaces between said microlens-like curved surface; and minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces.
Claim 3
Dependent Claim
17 words
A diffusion plate according to claim 1, wherein said irregularly arranged concavo-convex surfaces are minute curved surfaces.
Claim 4
Dependent Claim
23 words
A diffusion plate according to claim 1, further comprising irregularly arranged concavo-convex surfaces formed on said curved surfaces between said microlens-like curved surfaces.
Claim 5
Dependent Claim
58 words
A diffusion plate having the following constructions formed on the surface of the substrate thereof: microlens-like curved surfaces of a size of the order of 10 to several tens of μm arranged regularly and two-dimensionally; curved surfaces between said microlens-like curved surfaces; and minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces and on said curved surfaces.
Claim 6
Dependent Claim
58 words
A diffusion plate having the following constructions formed on the surface of the substrate thereof: microlens-like curved surfaces of a size of the order of 10 to several tens of μm arranged regularly and two-dimensionally; curved surfaces between said microlens-like curved surfaces; and minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces and on said curved surfaces.
References Cited (Backward Citations)
US2275602A
Cited
US4336978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-23 | 1987-07-25 | 1988-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-23 | 1991-07-25 | 1992-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-23 | 1995-07-25 | 1996-01-24 | $7700.00 | Window Closed / Lapsed |