Koninklijke Philips Corporation N.V.

U.S. Philips Corporation

Nxp B.v.

Piet Christiaan Jozef Van Rens

Wilhelmus Marinus Maria Van De Steen

Arnoldus Antonius Maria Hendriks

Jean Winters

Arjan Franklin Bakker

Joep Stokkermans

Thomas Markus Kampschreur

Piet Van Der Meer

Hernes Jacobs

J&ouml;rg Meissner

Jan Harmannus Post

Arnoldus Jacobus Cornelis Bernardus De Vet

Hendrik Pancratius Maria Bergmans

A method and apparatus are discloses for wirebonding leads of a plurality of lead frames being part of a lead frame assembly by a wirebonding tool to semiconductor products mounted on the respective lead frames. The semiconductor products are clamped by a clamping mechanism comprising a stationary clamp and a movable clamp. The movable clamp follows the indexing movement of the lead frame assembly during wirebonding of the semiconductor products clamped by the movable clamp. The wirebonding process does not need to be interrupted for the indexing.

Wirebonding method and apparatus

A color display tube ( ) is disclosed, which comprises an improved suspension system of the color selection electrode ( ). The color display tube has suspension means that are constructed so as to be self-locking. The suspension means ( ) are provided with an additional flat portion ( ). This plate has an aperture ( ) that is shaped such that it has at least three surfaces of engagement ( ) for the free end portion ( ) of the supporting elements ( ) connected to the inside of the upright edge ( ) of the display window ( ). When the color display tube is exposed to shock loading, the construction of the flat portion ( ) is capable of absorbing this shock without the color selection electrode ( ) becoming detached from the supporting elements ( ). The action is based on the friction between the surfaces of engagement ( ) and the free end portion ( ). When a force is applied in the plane ( ) of the resilient element ( ), the suspension means ( ) slip from their rest position and are locked by a surface of engagement ( ), whereby the preload caused by the resilient element ( ) and the spring ( ) will cause the suspension means ( ) to resume its original position. In this manner, a color display tube ( ) with a good positional stability of the color selection electrode ( ) is obtained. Furthermore, the color selection electrode ( ) can be reclaimed in case the color display tube ( ) is rejected because there is no need to weld the suspension means ( ) to the free end portions ( ) anymore.

Color display tube with improved suspension of the color selection electrode

A color display tube ( ) is disclosed with an improved suspension of the color selection electrode ( ). In order to have a color display tube with good properties of, for instance, color purity, it is of eminent importance that the color selection electrode ( ) has and excellent positional stability. Especially wide screen tubes seem to be more sensitive to external shocks by which the color selection electrode ( ) may shift and cause discolorations. The positional stability of the color selection electrode ( ) can be improved by decreasing the friction between the color selection electrode ( ) and the supporting elements ( ) in the display window ( ) of the color display tube ( ). This is achieved by applying a supporting element ( ) with a free end portion ( ) having a small diameter and by applying a low force between the suspension means ( ) and the supporting elements ( ). As a consequence of the lightweight construction of the color selection electrode ( ), this force can be lowered to about 4 newtons.

A color display tube (,) is disclosed with an improved suspension of the color selection electrode (,). In order to have a color display tube (,) with good properties of, for instance, color purity, it is of eminent importance that the positional stability of the color selection electrode (,) is excellent. Especially wide-screen tubes seem to be more sensitive to shocks by which the color selection electrode (,) may shift and cause discolorations. The positional stability of the color selection electrode (,) can be improved by increasing the stiffness of the corner sections (,) of the color selection electrode (,). This can be realized by introducing an additional support plate (,) in the corner section (,). Also the optimization of the position of the supporting element (,) with respect to this corner section (,) yields an improvement.

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Eindhoven, Netherlands

Piet Christiaan Jozef Van Rens