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Support-system-for-flat-CRT-tension-mask

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Support system for flat CRT tension mask

Details

Inventors: Lopata, Donald J.; Mathew, Robert L.;
Assignee: Corning Incorporated (Corning, NY)
Primary Examiner: DeMeo; Palmer C.
Assistant Examiner:
Attorney, Agent or Firm: Turner; Burton R., Wardell; Richard N.

A reference and support system for a flat CRT tension shadow mask is disclosed which includes a support frame which is frit sealed or shink fitted onto a peripheral surface surrounding a target area of a flat panel. An upper edge of the support frame is finished so as to provide the desired Q-spacing between the target area and the top of the support frame. Alignment holes are drilled in the sidewalls of the support frame at a given distance from the upper edge to form a reference plane relative thereto. A temporary fixture has a tensioned mask initially secured thereto and is provided with a plurality of pins extending through sidewalls thereof at a given distance from an upper reference surface such that the pins engage the holes in the support frame and precisely position the shadow mask in the plane of the top edge of the support surface. Such fixture may be utilized for not only applying the various phosphors to the target area, but also for finally positioning the tension shadow mask on the support frame so that it may be welded thereto and the temporary frame removed.

DETAILED DESCRIPTION In its simplest form, the present invention sets forth a new concept in providing a reference and support system for flat CRT shadow masks by shrink fitting or frit sealing a support frame to a step or groove formed in the back surface of a faceplate, and utilizing spaced holes or spheres for precisely and repeatedly registerably positioning a tension mask on said support frame with a predetermined Q-spacing.
A tensioned shadow mask is supported in a temporary frame having reference units which precisely engage the holes or spheres of the support frame so that the temporary tension mask assembly can be removed and precisely reinserted on the support frame for applying the required phosphors during the screening process, and for accurately relocating the mask on the frame for welding the mask to the support frame.

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