JPS5816292B2 - color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present application relates to a color picture tube with an improved mask support structure.

In the conventional shadow mask type color picture tube, as shown in FIG.
It is fixed by engaging with a plurality of metal support pins 6 welded to the inner wall of the.

. Although this support structure is a stable support means, it is difficult to achieve precision in the panel-mask spacing, which requires high precision, because the welding error of the metal support pin 6 is added to the mask assembly error. Furthermore, there are disadvantages in that the metal support pins 6 must be welded again after the panel is formed, and quality problems such as cracks in the panel occur due to heat treatment during the welding process.

The present application improves on the above-mentioned drawbacks, and instead of using metal support pins that are welded and fixed to the panel side walls as in the prior art, locking parts are provided on the panel inner wall, and the mask support structure is mechanically fitted and fixed to the core part. In addition, a color picture tube can be manufactured with high precision and good quality.

The details of the present application will be described below with reference to an embodiment of a shadow mask type color picture tube.

The schematic structure is shown in FIGS. 2 to 5. The envelope 11
is formed by sealing a panel 14 to a large-diameter opening of a funnel-shaped funnel 12 with a bonding agent 13 such as frit glass.

The neck 15 end of the funnel-shaped funnel 12 is connected to the stem 1
6, and an electron gun 17 having a plurality of electrodes connected to a lead wire passing through the stem 16 is disposed within the neck 15 thereof.

On the inner surface of the panel 14, facing the electron gun 17, there is formed a fluorescent surface 18 consisting of three-color fluorescent dots and the like.

A shadow mask 1 is placed close to and inside this fluorescent surface 18.
9 is placed.

The shadow mask 19 has a through-hole part 20 having a large number of electron beam passing holes arranged opposite to the fluorescent surface 18 fixed to a support frame 21, and this shadow mask is made of a panel as shown in FIG. The mask support piece 24 is engaged with and held by the support protrusion 23 of the mask support structure 22, which is fitted into and supported by a locking portion 26 provided on the inner wall 25 of the mask support structure 22.

As shown in FIG. 4, the locking portion 26 provided on the panel has a platform-like structure formed by protruding in the axial direction of the panel on the inner wall 25 of the panel.In the center thereof, a groove 27 with a wide bottom is formed. is provided in the groove, and a mask support structure 22 whose side edges are bent so as to fit into the groove 27 is provided in the groove as shown in FIG.
The metal fitting into which the mask support structure 2 is inserted and fitted has a structure in which both sides 28 are bent as described above and a support protrusion 23 is press-formed in the center.
2 is fixed in the groove of the locking portion 26 by applying a bonding agent 30 such as frit glass to the cutout portions of the bent sides on both sides and the locking portion surface in contact with the bent sides.

A support piece 24 fixed to the frame of the mask directly or through a bimetal is fitted into the support protrusion 23 of the fixed mask support structure, and the through hole 31 provided at the end of the support piece is fitted into the support protrusion 23 of the mask support structure. Support it in a predetermined position within the panel.

As explained above, the color picture tube of the present application has a structure in which the mask support structure is mechanically fixed to the locking part provided on the panel, and the mask is locked to this, and the process of welding the support pins as in the conventional method is not required. This eliminates the need for this process, reduces the occurrence of quality problems such as panel breakage accidents, and improves the accuracy of fixing the support pins.

Note that the locking portion of the panel and the mask support structure fixed to the portion are not limited to the above embodiments, and for example, as shown in FIGS. 6 and 7, the protruding cross-sectional shape of the locking portion 26 may be shaped like a wedge. The mask support structure 22 is formed by inserting and fitting the side portion 28 bent so as to wrap around the protruding portion of this wedge-shaped cross section, and applying an adhesive such as frit glass to the locking portion surface that contacts the bent portion. 30 may be applied and fixed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts showing the support structure of the panel and shadow mask in a conventional color picture tube, FIG. 2 is a simplified cross-sectional view illustrating the structure of the color picture tube of the present invention, and FIG. A sectional view of a main part of an embodiment of the color picture tube of the invention, No. 4
5 is a perspective view of a mask support structure adapted to FIG. 4, FIG. 6 is a perspective view of a main part of another embodiment of the picture tube of the present invention, and FIG. The figure is a perspective view of a mask support structure adapted to FIG. 6. 22... Mask support structure, 26... Locking portion, 30... Bonding agent.

Claims (1)

[Claims] 1. In a color picture tube in which a shadow mask is mounted in an envelope formed by joining a panel and a funnel, a plurality of locking portions each having at least one of a groove or a protrusion are provided on the inner wall of the panel, and 1. A color picture tube comprising a support structure having a mask support protrusion that is fitted and fixed to a stop and supports the shadow mask.