Color cathode ray tube
View Patent ↗The present invention provides a color cathode ray tube having a shadow mask for selecting colors, wherein the shadow mask satisfies the relation: 5.5 < Rh ( H 2 ) < 8.0 , where Rh is a mean curvature radius in the direction of the long axis of the shadow mask, H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask, and a mean curvature radius in the direction of the long axis satisfies the condition: Rh = ( H 2 ) 2 + Zh 2 2 * Zh where Zh is a recess amount in a direction of a tube axis at an end of the long axis of the effective surface with respect to a center of the effective surface.
1. A color cathode ray tube comprising:
a panel having a fluorescent surface therein;
a funnel coupled sealingly with the panel;
electron guns installed in the funnel, for projecting electron beams;
a deflection yoke for deflecting the electron beams; and
a shadow mask for selecting colors,
wherein the shadow mask satisfies the following relation:
5.5
<
Rh
(
H
2
)
<
8.0
,
where Rh is a mean curvature radius in the direction of the long axis of the shadow mask,
H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask, and
a mean curvature radius in the direction of the long axis satisfies the following condition:
Rh
=
(
H
2
)
2
+
Zh
2
2
*
Zh
,
where Zh is a recess amount in a direction of a tube axis at an end of the long axis of the effective surface with respect to a center of the effective surface.
2. The color cathode ray tube according to claim 1 , wherein the shadow mask is made of an Aluminum Killed material.
3. The color cathode ray tube according to claim 1 , wherein the shadow mask satisfies the following conditions:
Rh<Rv, and
Rh<Rd,
where Rh is a mean curvature radius in the direction of the long axis of the shadow mask,
Rv is a mean curvature radius in a direction of a short axis thereof, and
Rd is a mean curvature radius in a diagonal direction thereof.
4. The color cathode ray tube according to claim 1 , wherein the shadow mask is 0.20 mm˜0.25 mm thick.
5. The color cathode ray tube according to claim 1 , wherein a bridge of the shadow mask becomes bigger as it gets closer to the end of the long axis thereof.
6. The color cathode ray tube according to claim 1 , wherein the bridge of the shadow mask is 0.12 mm˜0.18 mm long.
7. The color cathode ray tube according to claim 1 , wherein an outer surface of the panel is substantially flat and an inner surface has a predetermined curvature.
8. A color cathode ray tube comprising:
a panel having a fluorescent surface therein;
a funnel coupled sealingly with the panel;
electron guns installed in the funnel, for projecting electron beams;
a deflection yoke for deflecting the electron beams; and
a shadow mask for selecting colors,
wherein the shadow mask satisfies the following relations:
5.5
<
Rh
(
H
2
)
<
8.0
,
Rh
<
Rv
,
and
Rh
<
Rd
where Rh is a mean curvature radius in the direction of the long axis of the shadow mask,
Rv is a mean curvature radius in a direction of a short axis thereof,
Rd is a mean curvature radius in a diagonal direction thereof,
H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask, and
a mean curvature radius in the direction of the long axis satisfies the following condition:
Rh
=
(
H
2
)
2
+
Zh
2
2
*
Zh
,
where Rh is the mean curvature radius in the direction of the long axis of the shadow mask,
Zh is a recess amount in a direction of a tube axis at an end of the long axis of the effective surface with respect to a center of the effective surface, and
H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask.
9. The color cathode ray tube according to claim 8 , wherein the shadow mask is made of an Aluminum Killed material.
10. The color cathode ray tube according to claim 8 , wherein an outer surface of the panel is substantially flat and an inner surface has a predetermined curvature.