Electric lamp or space discharge component or device manufacturi – Process – With assembly or disassembly
Patent
1987-12-21
1989-04-25
Ramsey, Kenneth J.
Electric lamp or space discharge component or device manufacturi
Process
With assembly or disassembly
430 23, 445 52, H01J 9227
Patent
active
048244120
ABSTRACT:
Apparatus for use in fabricating the faceplate section of a color cathode ray tube, which faceplate comprises a target surface and a shadow mask foil support frame affixed to and circumscribing the target surface. The apparatus comprises a pedestal having registration affording means associated therewith and a tensioning structure which includes a fixture comprising a pair of collars for clamping the edge of the shadow mask foil to support and maintain the foil taut. An anvil is provided for engaging a peripheral portion of the clamped foil to induce a deflection of the foil and, thereby, a predetermined tension in the foil. A first indexing means effects repeatable registrations between the clamping fixture and the pedestal registration affording means. A second indexing means registrably mounts the faceplate upon the tensing structure with the foil support frame engaging the foil inside the peripheral portion engaged by the anvil to induce an additional deflection of the foil and, thereby, an incremental increase in tension in the foil to establish the foil at a desired final operational tension.
The invention also contemplates a method of fabricating a screened faceplate utilizing the disclosed apparatus.
REFERENCES:
patent: 2625734 (1953-01-01), Law
patent: 3623211 (1969-10-01), Zuhlke
patent: 3894321 (1975-07-01), Moore
patent: 3995283 (1976-11-01), Dougherty
patent: 4605879 (1986-08-01), Rath
patent: 4704094 (1987-11-01), Stempfle
patent: 4713034 (1987-12-01), Lee et al.
patent: 4721879 (1988-01-01), Palac
Dougherty Lawrence W.
Fendley James R.
Ramsey Kenneth J.
Zenith Electronics Corporation
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