US3900249A
Expired / Lapsed
US
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Soft-focus optical element
Assignee: Nikon Corp
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Filing: 1973-05-09
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Granted: 1975-08-19
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Expires: 1993-05-09
Abstract
Abstract A soft-focus optical element includes a transparent substrate of a predetermined refractive index having portions thereof penetrated by extraneous ions in accordance with a desired pattern preformed on the substrate, the ion-penetrated portions have a refractive index different from that of the rest of the substrate, and method of forming same.
Inventors
- 👤 Teruyoshi Tsunashima
- 👤 Teruo Kaneko
- 👤 Takeo Ichimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:48
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/02; G02B5/0205; G02B5/021; G02B5/0226; C; C03; C03C; C03C21/00; G02B13/00; G02B13/20; G02B5/0236; G02B5/0242; G02B5/0273; G02B5/0278; G02B5/0294
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
57 words
A soft-focus optical element comprising a transparent substrate of a predetermined refractive index, and an almost infinite number of micro-and indefinite shaped ion-penetrated portions formed in said transparent substrate in accordance with a desired pattern preformed on said transparent substrate, said ion-penetrated portions having a refractive index different from that of the rest of said transparent substrate.
Claim 2
Dependent Claim
57 words
A soft-focus optical element comprising a transparent substrate of a predetermined refractive index, and an almost infinite number of micro-and indefinite shaped ion-penetrated portions formed in said transparent substrate in accordance with a desired pattern preformed on said transparent substrate, said ion-penetrated portions having a refractive index different from that of the rest of said transparent substrate.
Claim 3
Dependent Claim
50 words
A soft-focus optical element according to claim 1, in which said substrate is a glass and the dIfference between the refractive index of the bulk glass and that of the ionpenetrated portion produces an effective flare and clear portions simultaneously in an image formed by focusing light through said element.
Claim 4
Dependent Claim
85 words
A soft-focus optical element according to claim 1, in which said ion-penetrated portions include at least one kind of monovalent positive ions selected from the group consisting of alkali metal ions, thallium ions, silver ions and copper ions, and the portions of the transparent substrate other than said ion-penetrated portions include at least one kind of monovalent positive ions other than the ions included in said ion-penetrated portions and selected from the group consisting of alkali metal ions, thallium ions, silver ions and copper ions.
Claim 5
Dependent Claim
27 words
A soft-focus optical element according to claim 1, in which said transparent substrate is a plane-parallel plate which cannot form an image of the light passed therethrough.
Claim 6
Dependent Claim
32 words
A soft-focus optical element according to claim 1, in which said transparent substrate is an optical element which can focus only the light passed through the portions other than the ion-penetrated portions.
Claim 7
Dependent Claim
19 words
A soft-focus optical element according to claim 1, wherein said pattern is a positive pattern of an original image.
Claim 8
Dependent Claim
19 words
A soft-focus optical element according to claim 1, wherein said pattern is a negative pattern of an original image.
References Cited (Backward Citations)
US2353257A
Cited
US3486808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |