Picture tube having centering washer and spring for joining a ma

Details Picture tube having centering washer and spring for joining a ma Picture tube having centering washer and spring for joining a ma

1994-10-18

1997-03-11

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313405, 313407, H01J 2907

Patent

active

056104740

ABSTRACT:
According to the prior art, springs (11/18) of a combination mask/frame (10) of picture tubes are joined to the frame by resistance welding. This welding technique is also customary when one of the springs (18) has a centering washer (20) at its free end. When combination mask/frames (10) designed in this manner are snapped repeatedly into and out of the shielding case (15), and when the shielding case (15) is stabilized or fritted to the neck of the picture tube, it can happen that the expansion characteristics of the combination mask/frame (10) are not homogeneous at the fourth spring (18) as compared to the other springs (11) under the picture tube's operating conditions. According to the invention, the centering washer (20) is joined to the spring (18) by laser welding, with laser beams (24) striking the side of the spring (18) facing the frame (10) from the inside (22) of the combination mask/frame (10), and joining the welding grooves (25) arranged in the spring (18) at their edges (26) to the centering washer (20).

REFERENCES:
patent: 4358702 (1982-11-01), Gijrath et al.
patent: 4467242 (1984-08-01), Wilbur, Jr. et al.
patent: 4812704 (1989-03-01), Van der Ven
patent: 4963786 (1990-10-01), Tokita et al.
patent: 5003218 (1991-03-01), Gijrath et al.

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