Claims
- 1. A color cathode-ray tube comprising a shadow mask and a mask frame for fixing the shadow mask, the shadow mask being fixed in the mask frame in a condition in which a tension is applied in one direction and at an end portion of the mask frame in the direction in which the tension is applied, which is provided with a vibration attenuator formed of an elastic body that is in contact with an end portion of the shadow mask in the direction perpendicular to the direction in which the tension is applied and which is not fixed in the mask frame, and in which vibration of the shadow mask is attenuated as the shadow mask slides on the vibration attenuator.
- 2. The color cathode-ray tube according to claim 1, wherein the vibration attenuator is in contact with the end portion of the shadow mask, applying an in-plane force to the shadow mask.
- 3. The color cathode-ray tube according to claim 2, wherein a dead weight for adjusting an effect of attenuating vibration of the shadow mask is attached to the vibration attenuator.
- 4. The color cathode-ray tube according to claim 2, wherein the in-plane force is in the range of 2.94×10−3 to 29.4×10−3 N.
- 5. The color cathode-ray tube according to claim 1, wherein the vibration attenuator is in contact with a side surface of the shadow mask.
- 6. The color cathode-ray tube according to claim 1, wherein the vibration attenuator is inserted through a hole formed in the end portion of the shadow mask.
- 7. The color cathode-ray tube according to claim 1, wherein the shadow mask is a flat plate in which many slot or dot apertures are formed, and in which a tension is applied in one direction.
- 8. The color cathode-ray tube according to claim 1, wherein the shadow mask is a flat plate in which many slot or dot apertures are formed, and in which the tension is applied in one direction, and whereinan amplitude in an end portion of the shadow mask in the direction perpendicular to the direction in which the tension is applied is not less than a certain amount relative to an amplitude in a center portion of the shadow mask, in a vibration mode of a seventh or less order for a resonance of the shadow mask caused by a vibration propagated to the color cathode-ray tube.
- 9. The color cathode-ray tube according to claim 8, wherein an amplitude in the end portion of the shadow mask is not less than 20% with respect to an amplitude in the center portion of the shadow mask.
- 10. The color cathode-ray tube according to claim 8, wherein a tension stress in the center portion of the shadow mask is larger than a tension stress in the end portion of the shadow mask.
- 11. he color cathode-ray tube according to claim 10, wherein when the tension stress in the center portion of the shadow mask is σ1 and the tension stress in the end portion of the shadow mask is σ2, an inequalityσ1≧1.1σ2 is satisfied.
- 12. The color cathode-ray tube according to claim 8, wherein there is a maximum value of tension stress between the center portion and the end portion of the shadow mask.
- 13. The color cathode-ray tube according to claim 12, wherein when the tension stress in the center portion of the shadow mask is σ1, the tension stress in the end portion of the shadow mask is σ2, and the tension stress in an intermediate portion between the center portion and the end portion is σ3, inequalitiesσ3≧1.1σ1, σ2≧σ1, and σ3≧σ2 are satisfied.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-246913 |
Sep 1998 |
JP |
|
Parent Case Info
This application is a divisional of application Ser. No. 09/384,358, filed Aug. 27, 1999, now U.S. Pat. No. 6,469,431, which application is incorporated herein by reference.
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