Shadow mask damping for color CRT

Details Shadow mask damping for color CRT Shadow mask damping for color CRT

1993-10-28

1995-09-19

Coles, Sr., Edward L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313269, H01J 2980

Patent

active

054518334

ABSTRACT:
A damping arrangement for use with a shadow mask in a color cathode ray tube (CRT) absorbs vibrations of the shadow mask, particularly at low frequencies, to maintain registration of the shadow mask apertures with phosphor deposits on the inner surface of the CRT's faceplate for high video image color purity. A damping material having a higher modulus of elasticity (Young's modulus) than that of the shadow mask is applied to one or both surfaces of the shadow mask either over the entire surface or in spaced bands extending the length or width of the mask. The damping coating may be applied either by spraying or by vacuum deposition and may be comprised of virtually any material having a higher modulus of elasticity than that of the shadow mask such as a glass-based frit or a heavy metal such as tungsten or molybdenum.

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High-definition television display-a CRT approach, Hua-Sou Tong, pp. 1757-1761, Optical Engineering, vol. 32 No. 8, Aug., 1993.

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