US3909524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube
Assignee: Sony Corp
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Filing: 1973-08-20
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Granted: 1975-09-30
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Expires: 1993-08-20
Abstract
Abstract A cathode ray tube having an optical filter disposed between the face panel of the cathode ray tube and a safety glass plate for preventing external light from being passed therethrough to the face panel and transparent resin injected between the face panel and the safety glass plate to secure the safety glass plate and the optical filter to the cathode ray tube in front of the face panel thereof. The optical filter is composed of a laminated element composed of alternate transparent layers and dark layers, the direction of extension of the laminations being substantially parallel to the face panel of the tube, i.e., with the contacting faces of each layer of the laminations being at right angles to the face panel or at a substantial angle thereto.
Inventors
- 👤 Akio Ohkoshi
- 👤 Takizo Shiota
- 👤 Nobuo Kitamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:18
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/87; H01J29/89; H01J2229/00; H01J2229/87; H01J2229/875; H01J2229/89; H01J2229/8901; H01J2229/8909; H01J2229/8913; H01J2229/8922
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A cathode ray tube having a face panel and a transparent safety plate mounted on said tube in spaced relation to said face panel, an optical filter mounted between said face panel and said safety plate in a transparent resin which fills the space between said face panel and said safety plate and holds said filter in place, said optical filter comprising a composite sheet made of a plurality of parallelepipeds of transparent material having a first viewing side facing toward said safety plate, a second side parallel to said first side and facing said face panel, and third and fourth sides parallel to each other and respectively joining said first and second sides, a light impervious layer on at least one of said third and fourth sides and said plurality of parallelepipeds joined on their third and fourth sides together to form a sheet filter structure such that the light impervious layer is between adjacent parallelepipeds.
Claim 2
Dependent Claim
157 words
A cathode ray tube having a face panel and a transparent safety plate mounted on said tube in spaced relation to said face panel, an optical filter mounted between said face panel and said safety plate in a transparent resin which fills the space between said face panel and said safety plate and holds said filter in place, said optical filter comprising a composite sheet made of a plurality of parallelepipeds of transparent material having a first viewing side facing toward said safety plate, a second side parallel to said first side and facing said face panel, and third and fourth sides parallel to each other and respectively joining said first and second sides, a light impervious layer on at least one of said third and fourth sides and said plurality of parallelepipeds joined on their third and fourth sides together to form a sheet filter structure such that the light impervious layer is between adjacent parallelepipeds.
Claim 3
Dependent Claim
25 words
A cathode ray tube according to claim 1, wherein said first and second sides are substantially at right angles to said third and fourth sides.
Claim 4
Dependent Claim
21 words
A cathode ray tube according to claim 1, wherein said first sides are at an oblique angle to said third sides.
Claim 5
Dependent Claim
16 words
A cathode ray tube according to claim 1, wherein said plurality of parallelepipeds extend substantially horizontal.
Claim 6
Dependent Claim
23 words
A cathode ray tube according to claim 1, wherein the number of parallelepipeds is greater than twice the number of horizontal scanning lines.
Claim 7
Dependent Claim
18 words
A cathode ray tube according to claim 1, wherein said optical filter substantially covers the whole face panel.
Claim 8
Dependent Claim
29 words
A cathode ray tube as defined by claim 6, in which at least one recess is formed on the outside of the effective picture area of said optical filter.
Claim 9
Dependent Claim
29 words
A cathode ray tube as defined by claim 6, in which a plurality of openings are formed on the outside of the effective picture area of said optical filter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |