JPH0546151B2 - - Google Patents

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a cathode ray tube of a projection picture tube.

[Prior art]

As shown in Figs. 1 and 2, a liquid-cooled projection cathode ray tube has an adhesive tape 2 wrapped around the maximum outer diameter of a cathode ray tube 1 whose interior is evacuated to a high vacuum. A metal shield tensioning band 3 heated and expanded around the outer circumference firmly tightens the maximum outer diameter part of the cathode ray tube 1 by gas or electric heating.
Shield the line. A mounting lug 4 in which a through hole 4a for assembling a picture tube set is formed is welded and fixed to the metal shield strap 3. Furthermore, in order to fix the upper surface 1a of the cathode ray tube face and the glass face plate 5, a blanket 6 is fixed to the outer periphery of the metal shield band 3 with a silicone adhesive layer 7, and a small hole in the side surface of the blanket 6 prevents the rise in temperature of the cathode ray tube face. The structure is such that the refrigerant 8 is inserted into the hollow part between the glass face plate 5 and the glass face plate 5 for the purpose of suppressing the refrigerant.

In this way, since the metal shield bandage 3 is wrapped around the maximum outer diameter of the cathode ray tube, leakage of X-rays from the outer peripheral surface of the cathode ray tube can be shielded. Furthermore, since the coolant 8 is injected into the upper surface 1a of the face of the cathode ray tube 1 and the hollow portion of the glass face plate 5, the face of the cathode ray tube 1 is cooled by the convection action of the coolant.

However, for the cathode ray tube face,
The side of the metal shield bandage 3, i.e. the cathode ray tube 4
At present, the Z-point position of the mounting lug, which is welded and fixed to the corner part, has a variation of ±1.0 mm, which has the disadvantage that perfect parallelism cannot be achieved when it is assembled into a picture tube set.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned conventional drawbacks, and an object of the present invention is to provide a liquid-cooled structure or an air-cooled projection picture tube that can completely adjust the parallelism of the mounting lugs at a plurality of locations with respect to the cathode ray tube face. purpose.

[Summary of the invention]

The present invention provides a female screw for Z point positioning in addition to the through hole of the mounting lug which is welded and fixed to the metal shield strap of the projection picture tube, and furthermore a vertical screw having a reference surface with a flat head. It is characterized by the fact that the Z-point positioning of the mounting lug parallel to the cathode ray tube face surface can be reliably and precisely determined by the combination of the above.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same members or equivalent members as in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted. Third
3 and 4 show an embodiment of the present invention, FIG. 3 is a side longitudinal sectional view of a corner portion of a cathode ray tube, and FIG. 4 is a plan view of a main part. The mounting lug 4 is formed with a female thread 4b in addition to a through hole 4a for assembling the picture tube set.

FIG. 5 is a sectional view of a main part of a mounting lug according to the present invention, in which a male screw having a flat head with a reference surface is inserted into the female screw portion and fixed thereto. The configuration is similar to that shown in FIG. 3, with a jig 10 having a reference plane parallel to the upper surface 1a of the face of the cathode ray tube 1, and a male screw 11 with a flat head attached to a plurality of mounting lugs 4.
into the female thread 4b, and the reference surface 11 of the male thread 11.
After a contacts the jig 10, the lock nut 1
Dry and fix 2. Further, an adhesive layer for screw locking may be provided in addition to the lock nut 12 to secure it.

FIGS. 6 and 7 show longitudinal cross-sectional views of other embodiments of the present invention.

The mounting lug 4 has a through hole 4 for installing the picture tube set.
a, a female thread 4b for insertion of a male adjustment screw, and a convex portion 4c for projection welding. In particular, the adjustment male screw insertion female screw 4b of the mounting lug 4 shown in FIG. 7 is burred to increase the number of female screw taps.

FIGS. 8 and 9 show still another embodiment of the present invention, and FIG. 8 shows a plan view of the device installed at four corners. FIG. 9 shows a plan view of the device installed at multiple locations on a straight section. In each of the above embodiments, a female adjustment screw 4b is inserted into a through hole 4 for assembling the picture tube set.
Although it is formed on the outside of the cathode ray tube 1, it may be formed along the outer periphery of the cathode ray tube 1 as shown in this embodiment.

〔Effect of the invention〕

As is clear from the above description, according to the projection type picture tube having a liquid-cooled structure and an air-cooled structure according to the present invention, a female threaded hole for Z-point positioning is provided in the mounting lug in addition to the through hole for assembling the picture tube set, and a flat By adjusting the insertion and insertion of a male screw with a reference surface head, it is possible to perfectly align the Z point positions of multiple mounting lugs with the CRT face plane, which is several times faster than the conventional mounting lug structure. The parallelism accuracy was obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory longitudinal cross-sectional view of a main part of a corner of a conventional liquid-cooled projection picture tube, FIG. 2 is an explanatory plan view of the vicinity of the corner of FIG. 1, and FIGS. Embodiments are shown, and FIG. 3 is an explanatory longitudinal cross-sectional view of a main part of a corner of a liquid-cooled projection picture tube of the present invention, and FIG.
5 is a cross-sectional view of the mounting lug of the present invention; FIGS. 6 and 7 are cross-sectional views of the mounting lug showing other embodiments of the present invention; FIG. FIG. 9 is an explanatory plan view of a mounting lug showing still another embodiment of the present invention. 1... Braun tube, 1a... Top surface of face, 2
... Adhesive tape, 3 ... Metal shield bandage, 4
...Mounting lug, 4a...Through hole for assembling picture tube set, 4b...Female thread, 6...Blanket, 8
... Refrigerant, 10 ... Jig, 11 ... Male thread, 12
...Rotsuknut.

Claims (1)

[Claims] 1 Adhesive tape is attached to the maximum outer diameter of the cathode ray tube, and X is irradiated from an electron gun to the outer circumference of this adhesive tape.
A refrigerant having a transmittance equivalent to that of the cathode ray tube glass is injected into the hollow part of the face of the cathode ray tube located on the phosphor screen side of the cathode ray tube. In a liquid-cooled projection picture tube consisting of a face plate and a blanket for fixing a cathode ray tube, the mounting lug, which is welded and fixed to the metal shield strap, has a through hole for assembling the cathode ray tube receiver, as well as a hole for Z point positioning. A screw is provided, a reference surface is provided at the tip with a flat head or a flat surface, and a male screw with an adjustment groove is inserted into the other tip to determine the parallelism between the CRT face surface and the mounting lug plane. A reinforced lug structure for a projection picture tube, which is characterized by having a function that allows accurate adjustment of the projection type picture tube.