Patent US4065283A successfully refreshed from Google Patents.
US4065283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making a glass-based soft-edged aperture filters
Assignee: Hoya Glass Works Ltd
•
Filing: 1976-03-22
•
Granted: 1977-12-27
•
Expires: 1996-03-22
Abstract
Abstract Glass-based soft-edged aperture filters having good thermal stability are produced by diffusing a coloring element such as Ag into a glass, thus providing a transmittance gradient in the colored portion thereof. A glass composition comprising a basic glass, such as a silicate, borosilicate or phosphate glass, and 1 to 10% by weight of As 2 O 3 and/or Sb 2 O 3 is especially suitable for producing such soft-edged aperture filters.
Inventors
- 👤 Yoshijuki Asahara
- 👤 Tetsuro Izumitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:57
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/205; C; C03; C03C; C03C21/00; C03C21/001; C03C21/005; G02B27/00; G02B27/58; G02B5/005; G02B5/22; G02B5/226
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A method for producing a soft edged aperture filter to prevent Fresnel diffraction at the edge of a glass rod which comprises diffusing a coloring element into a glass plate which has on a first surface thereof a glass projection portion which does not extend to any side of the glass plate, wherein said diffusion is into the projection and into said first surface and bottom surface of the plate, and subsequently removing said glass projection portion down to said first surface having said diffused coloring element without disturbing said first surface and removing the diffused bottom surface to thereby provide a light transmittance gradient arranged in a circle on the glass plate, the gradient being a lowering of the light transmittance between the first and second surfaces of the glass plate in the radial direction from the inner to the outer portion of the circle.
Claim 2
Independent Claim
146 words
A method for producing a soft edged aperture filter to prevent Fresnel diffraction at the edge of a glass rod which comprises diffusing a coloring element into a glass plate which has on a first surface thereof a glass projection portion which does not extend to any side of the glass plate, wherein said diffusion is into the projection and into said first surface and bottom surface of the plate, and subsequently removing said glass projection portion down to said first surface having said diffused coloring element without disturbing said first surface and removing the diffused bottom surface to thereby provide a light transmittance gradient arranged in a circle on the glass plate, the gradient being a lowering of the light transmittance between the first and second surfaces of the glass plate in the radial direction from the inner to the outer portion of the circle.
Claim 3
Dependent Claim
69 words
The method as claimed in claim 1, wherein said projection portion has the shape of a. a cylinder attached at a base surface thereof to the first surface of the glass plate; b. a truncated right cone attached at the larger base thereof to the first surface of the glass plate; or c. a hemispherical convex attached at the base thereof to the first surface of the glass plate.
Claim 4
Dependent Claim
27 words
The method as claimed in claim 1, wherein the coloring element is selected from the group consisting of Ag, Cu and Au metals and transistion metal ions.
Claim 5
Dependent Claim
13 words
The method as claimed in claim 3, wherein said coloring element is Ag.
Claim 6
Dependent Claim
32 words
The method as claimed in claim 1, wherein the glass plate comprises a basic glass and 1 to 10% by weight of As 2 O 3 and/or Sb 2 O 3 .
Claim 7
Dependent Claim
25 words
The method as claimed in claim 1, wherein the glass plate comprises a basic glass and 4% by weight of Sb 2 O 3 .
Claim 8
Dependent Claim
24 words
The method as claimed in claim 5, wherein said basic glass is selected from the group consisting of a silicate, borosilicate or phosphate glass.
Claim 9
Dependent Claim
27 words
The method as claimed in claim 1, wherein said diffusion is accompanied by heating at a temperature near the glass transistion temperature Tg of the glass plate.
Claim 10
Dependent Claim
29 words
The method as claimed in claim 1, wherein said light transmittance gradient is a gradient which decreases from about 100% to about 10 -4 % in said radial direction.
References Cited (Backward Citations)
US2925370A
Cited
US3495963A
Cited
US3486808A
Cited
US3846099A
Cited
US3528847A
Cited
US3563057A
Cited
US3873408A
Cited
US3764198A
Cited
US3907586A
Cited
US3802761A
Cited
US3888648A
Cited
US3940531A
Cited
US3843343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |