US3573527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shadow mask supported by bimetallic spring comprising coplanar strips with different coefficients of expansion
Assignee: Individual
•
Filing: 1969-02-03
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Granted: 1971-04-06
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Expires: 1989-02-03
Abstract
Abstract A color display tube in which the shadow mask is suspended by means of resilient strips which consist of strips of metals having different coefficients of expansion, the narrow sides of which are welded together, the welding seam extending along the longitudinal axis of the strip, and the strip upon heating being bent in its plane in such a manner that the mask is moved towards the display screen.
Inventors
- 👤 Gerardus Antonius Hafkenscheid
- 👤 Gerardus Wilhelmus Plukker
- 👤 Jan Willem Ruis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
B; B65; B65C; B65C5/00; B65C5/02; B65C5/04; H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J29/073
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A cathode ray tube comprising an evacuated envelope having a substantially rectangular window at one end thereof, a plurality of phosphor triads constituting a luminescent screen disposed on said window, a substantially rectangular color-selection electrode having apertures therein aligned with said phosphor triads, and at least three bimetallic springs positioned along the perimeter of said electrode for supporting said electrode with minimum transferring of impacts from said envelope to said envelope, each of said bimetallic springs comprising two flat coplanar metallic strips having different coefficients of expansion along abutting longitudinal edges in a coplanar arrangement with one end secured to said electrode and the other end connected to said envelope, said strip having the greater coefficient of expansion being nearer said display screen whereby said electrode is moved in a direction towards said screen parallel to surfaces of said strips and orthogonal to longitudinal edges of said spring upon an increase in temperature of said electrode.
Claim 2
Dependent Claim
156 words
A cathode ray tube comprising an evacuated envelope having a substantially rectangular window at one end thereof, a plurality of phosphor triads constituting a luminescent screen disposed on said window, a substantially rectangular color-selection electrode having apertures therein aligned with said phosphor triads, and at least three bimetallic springs positioned along the perimeter of said electrode for supporting said electrode with minimum transferring of impacts from said envelope to said envelope, each of said bimetallic springs comprising two flat coplanar metallic strips having different coefficients of expansion along abutting longitudinal edges in a coplanar arrangement with one end secured to said electrode and the other end connected to said envelope, said strip having the greater coefficient of expansion being nearer said display screen whereby said electrode is moved in a direction towards said screen parallel to surfaces of said strips and orthogonal to longitudinal edges of said spring upon an increase in temperature of said electrode.
Claim 3
Dependent Claim
38 words
A cathode ray tube as claimed in claim 1, wherein the strip consists of a chromium nickel steel strip having 18 percent by weight of chromium, 8 percent by weight of nickel and a strip consisting of invar.
Claim 4
Dependent Claim
22 words
A cathode ray tube as claimed in claim 1, wherein the free part of the resilient strip lies in a flat plane.
Claim 5
Dependent Claim
47 words
A cathode ray tube as claimed in claim 1, wherein the end of the member which is connected to the color-selection electrode is provided with tags which can be bent around the lower edge of a supporting frame of the color-selection electrode and can be welded thereto.
Claim 6
Dependent Claim
35 words
A color-selection electrode provided with at least three suspension members as claimed in claim 1, wherein at least one of these members is bent around a corner of the color-selection electrode and is welded thereto.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |