Nokia Technology Gmbh

Heinz Lagger

Rolf Reidinger

Werner Wolffram

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).

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Wendlingen, Germany

Heinz Lagger