Laser cathode ray tube (laser-CRT) and method of...

Electric lamp and discharge devices – Cathode ray tube – Screen

Reexamination Certificate

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Details

C313S463000, C445S045000

Reexamination Certificate

active

06194825

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laser cathode ray tube (laser-CRT) and a method of manufacturing the same, and more particularly, to a laser-CRT in which the structure connecting a disk to a metal ring is improved to maintain a vacuum during operation of the laser-CRT at a low temperature.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional laser-CRT includes a glass bulb
12
having an electron gun
11
emitting electron beams inserted therein, a connection ring
13
connected to an end of the glass bulb
12
, a target portion
14
on which electron beams emitted from the electron gun
11
collide to generate a laser beam to form an image, and a support ring
15
in which the target portion
14
is installed, connected to the connection ring
13
. Here, the target portion
14
includes a single-crystal
16
for generating a laser beam when the electron beam is input, a resonator
18
composed of mirrors
17
a
and
17
b
formed on both sides of the single-crystal
16
, and a disk
19
connected to one side of the resonator
18
.
The inside of the laser-CRT is maintained in a vacuum, and when the electron beams emitted from the electron gun
11
are accelerated toward the target portion
14
to collide against the single-crystal
16
of the resonator
18
, the laser beams are generated, to thereby form an image. The temperature of the single-crystal
16
must be maintained at 80-200K to generate stable laser beams, so that the disk
19
formed of sapphire having excellent thermal emission is connected to one side of the resonator
18
. Also, a refrigerant such as liquid nitrogen is supplied to the disk
19
to maintain the resonator
18
at a relatively low temperature.
The room temperature of the laser-CRT becomes a low temperature during driving, so that junction portions of components are deformed due to a difference in the respective thermal expansion coefficients and thus the vacuum state of the laser-CRT may be compromised, which occurs more severely at the junction portion between the disk
19
of the target portion
14
and the support ring
15
. In detail, referring to
FIG. 2
, the junction between the disk
19
of a nonmetal and the support ring
15
, is realized by a metalizing method in which a metal layer
21
containing Mo or Mn and a Cu-layer
22
are interposed therebetween. That is, in the above junction process, a paste having Mo and Mn as a main material is coated on a surface of the disk
19
and then the surface is dried to thereby form a metal layer
21
. Subsequently, when the metal layer
21
is heat-treated at a high temperature, a glass component of the disk
19
reacts with Mn of the metal layer
21
to realize a junction between the metal layer
21
and the disk
19
. Also, a Cu-layer
22
is formed between the metal layer
21
and the support ring
15
using a Cu welding material, to thereby connect the disk
19
to the support ring
15
.
However, when the conventional laser-CRT having the above junction structure is driven at 80~200K for an extended period of time, the metal layer
21
and the Cu-layer
22
tend to be brittle, so that cracks or deformations occur at the junction portion between the support ring
15
and the disk
19
, to thereby damage the vacuum state of the laser-CRT.
When an impurity flows into the laser-CRT due to the lack of integrity in the vacuum state, a proceeding path of electron beams is distorted, so that the electron beams cannot accurately land, to thereby deteriorate the screen quality. Also, the durability of the laser CRT is deteriorated due to weakening of the junction portion, to thereby reduce the life of the device.
SUMMARY OF THE INVENTION
To solve the above problems, it is an objective of the present invention to provide a laser cathode ray tube and a manufacturing method thereof in which a disk and a support ring are connected by an alloy layer having excellent intensity, to thereby maintain the vacuum state of a junction portion between the disk and the support ring even when driven at a low temperature.
Accordingly, to achieve the above objective, a cathode ray tube according to the present invention comprises:
a connection ring connected to an end portion of a glass bulb where an electron gun is installed;
a disk having a single-crystal for generating laser beams when electron beams emitted from the electron gun are input;
a support ring connected to the disk and the connection ring; and
a junction layer interposed between the support ring and the disk, having at least two metal thin films which have been pressurized and heated, to connect the support ring and the disk to each other.
The metal thin films includes a Ti thin film and a Ni thin film.
According to another aspect of the present invention, there is provided a method of manufacturing a laser cathode ray tube comprising the steps of:
interposing at least two metal thin films between a support ring and a disk;
pressurizing the metal thin films; and
connecting the support ring and the disk to each other by heating the metal thin films.
Here, the metal thin films are heated in a vacuum state or in an atmosphere of an inert gas.


REFERENCES:
patent: 4650108 (1987-03-01), Gallagher
patent: 5374870 (1994-12-01), Akhekyan et al.
patent: 2482366 (1981-11-01), None

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