KR100522673B1 - Lazer CRT - Google Patents

Abstract

A laser cathode ray tube is disclosed. According to the invention, the bulb is formed integrally with the tube in which the electron gun is embedded; A first sleeve coupled to the tip of the bulb and a second sleeve installed at the tip of the first sleeve; A sapphire disk and a laser oscillation unit installed inside the second sleeve; A cooling frame installed at the front end of the second sleeve, the cooling frame having a window built inside the cooling frame to form a refrigerant flow space between the window and the sapphire disk; In the laser cathode ray tube provided with a lens mount provided at the tip of the cooling frame, the laser cathode ray tube, characterized in that the bonding surface of the first sleeve bonded to the bulb is embossed or scratched.

Description

Laser Cathode Ray Tube {Lazer CRT}

The present invention relates to a laser cathode ray tube, and more particularly, to a laser cathode ray tube having an improved coupling structure between a bulb and a coupling sleeve.

Generally, a laser cathode ray tube is used for a projection apparatus, for example, a projector for projection of a laser image, a projection television, etc. In the case of a projection television, an image separated by three primary colors of light is formed as a laser beam through three laser cathode ray tubes separated for each color, and the laser beams are magnified through a lens to be projected on the screen. Each color is synthesized so that you can see the color image.

Hereinafter, a conventional laser cathode ray tube will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a conventional laser cathode ray tube, and FIG. 2 is a cross-sectional view taken along the line II-II.

Referring to the drawings, the laser cathode ray tube is formed of a bulb 16 maintained in a vacuum state, a first coupling sleeve 15 engaging with the bulb 16, and a tube 22 fused to the rear end of the bulb 16. It includes an electron gun 19 installed therein, a laser oscillation unit 13 receiving the electron beam from the electron gun 19 to oscillate the laser beam L and supported by the first coupling sleeve 15. The laser oscillation unit 13 has a structure in which mirrors 13b and 13c are stacked on both sides of the laser oscillation layer 13a. A deflection yoke 17 for deflecting the electron beam is provided on the outer circumferential portion of the bulb 16, and a field magnet 18 for adjusting the electron beam is provided on the outer circumference of the tube 22. The first coupling sleeve 15 is coupled to the second coupling sleeve 14, and the second coupling sleeve 14 is sapphire disk 12, which is a heat transfer member for heat dissipation, through the bonding medium A. Are combined. In front of the sapphire disk 12, the front window 11 made of a transparent glass material is spaced apart by a predetermined interval.

A cooling unit 20 is installed between the front surface of the sapphire disk 12 and the front window 11, and the cooling unit 20 includes a second coupling sleeve 14 and a lens group 24 including a plurality of lenses. A cooling frame 25 installed to connect one lens mount 10, a refrigerant inlet 20a provided at one side of the outer peripheral portion of the cooling frame 25, and a refrigerant outlet provided at an opposite side of the refrigerant inlet 20a ( 20b) and a packing member 21 for preventing refrigerant from leaking out. The refrigerant flows into the flow space formed inside the cooling frame 25 to absorb the heat transferred to the sapphire disk 12 and its surroundings.

In the laser cathode ray tube as described above, the electron beam is emitted from the electron gun 15 toward the laser oscillation unit 13. The laser oscillation layer 13a of the laser oscillation part 13 in which the electron beam collided absorbs the energy of an electron beam and is excited, and the light generated by this is resonated between two mirrors 13b, 13c, and the laser beam L Occurs. The laser beam L is then projected through the sapphire disk 12 and through the plurality of lens groups 24 in the lens mount 10 onto the screen.

In the above laser cathode ray tube, the first coupling sleeve 15 is made of a so-called coba material containing 29%: 17%: 54% of nickel, cobalt and iron, and the bulb 16 is made of borosilicate glass. The first joining sleeve 14 is joined to the bulb 16 by heating the joining surface, by which a vacuum must be maintained. The second coupling sleeve 14 is also made of a coba material, which is joined to the outer circumferential surface of the sapphire disc 12 by using a so-called Molyman method. In the Molyman method, a paste material mixed with an organic binder is added to the outer circumferential surface of the sapphire disc 12 with molybdenum and manganese having a particle diameter of 3 micrometers or less as a main component, and a trace amount of iron, silicon, and the like added. The paste material is then dried and placed in place in the second bonding sleeve 14 using a jig and heated to a temperature of at least 1300 degrees Celsius. This causes the glass phases of manganese and sapphire to react with each other on the surface of the sapphire disk 12 to be bonded.

As described above, when the bulb 16 and the sapphire disk 12 are bonded to the first and second sleeves 15 and 14 by using a heating method, the following problems occur. First, a stress is generated between the first sleeve 15 and the bulb 16 due to a difference in thermal expansion coefficients and thermal stresses between different materials in the course of slow cooling after heat bonding. In order to remove such stress, a high temperature treatment is performed as a post process. After the high temperature treatment, the surface of the oxidized sleeve is cleaned by using hydrofluoric acid, which occurs in the case where the oxide film of the bonded portion is released, and the bonding strength is lowered. Weakening of the bond strength negatively affects leakage and cracks when maintaining high vacuum during actual use. On the other hand, the coupling between the second sleeve 14 and the sapphire disk 12 has a problem in reliability in tensile strength and compressive strength when driving the laser cathode ray tube at low temperature, and particularly has a bad effect on the vacuum tightness during long-term use. Go crazy.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a laser cathode ray tube with improved bonding strength between the sleeve and the bulb or sapphire disk.

In order to achieve the above object, according to the present invention, the bulb is formed integrally with the tube in which the electron gun is embedded; A first sleeve coupled to the tip of the bulb and a second sleeve installed at the tip of the first sleeve; A sapphire disk and a laser oscillation unit installed inside the second sleeve; A cooling frame installed at the front end of the second sleeve, the cooling frame having a window built inside the cooling frame to form a refrigerant flow space between the window and the sapphire disk; In the laser cathode ray tube provided with a lens mount provided at the tip of the cooling frame, the laser cathode ray tube, characterized in that the bonding surface of the first sleeve bonded to the bulb is embossed or scratched.

Hereinafter, the present invention will be described in more detail with reference to an embodiment shown in the accompanying drawings.

3 is an exploded perspective view illustrating only the first coupling sleeve and the bulb in the laser cathode ray tube according to the present invention.

Referring to the drawings, the rear end of the first coupling sleeve 35 is engaged by being inserted into the front end of the bulb 36. The portion denoted by reference numeral 37 is a joint surface between the first coupling sleeve 35 and the bulb 36, and reference numeral 32 is a tube integrally formed with the bulb 36.

According to a feature of the invention, the surface of the joining surface 37 is embossed or scratched prior to heat joining. That is, in order to expand the surface area which contacts the bulb 36, the joining surface 37 is processed using a predetermined means. For example, embossing is formed by sandblasting the joining surface 37, or it is grind | pulverized to form a scratch. After such pretreatment, the high temperature heating in the state in which the first coupling sleeve 35 and the bulb 36 are combined may cause the bulb 36 of the borosilicate glass material to melt and bond more strongly to the embossed surface or the scratch surface. That is, the molten borosilicate glass particles penetrate into the embossed portion or the scratched portion to increase the joining area and form a mutually curved shape, thereby preventing the phenomenon of joining. After the heat bonding, the oxide film is removed from the first bonding sleeve 35 except for the bonding surface 37 through a hydrofluoric acid cleaning process as is known, in which case the oxide film formed on the bonding surface 37 may be separated. This is significantly reduced.

As described above, after the first coupling sleeve 35 and the bulb 36 are bonded, and the second coupling sleeve 14 (FIG. 1) and the sapphire disk 12 are bonded, the first coupling sleeve is bonded. The sleeve assembly as shown in FIGS. 1 and 2 can be manufactured by mutual arc welding the 35 and the second coupling sleeve 14 (FIG. 1).

The laser cathode ray tube according to the present invention has an advantage that the bonding strength between the sleeve and the bulb is increased, thereby making the manufacturing process easier and the reliability of the device is improved. That is, the likelihood of cracking in the manufacturing process is reduced and airtightness is easily maintained. In addition, the laser cathode ray tube manufactured as described above has an advantage of extending life.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is exemplary and will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. . Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a schematic partial ablation perspective view of a laser cathode ray tube according to the prior art;

FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. 1. FIG.

Figure 3 is an exploded perspective view of the first sleeve and the bulb provided in the laser cathode ray tube according to the present invention.

<Brief Description of Major Codes in Drawings>

10. Lens Mount 11. Front Window

12. Sapphire Disc 14. Second Bonding Sleeve

15. First Combined Sleeve 19. Electron Gun

25. Cooling frame 32. Tube

35. First bond sleeve 37. Joint surface

Claims (1)

A bulb formed integrally with the tube in which the electron gun is embedded; A first sleeve coupled to the tip of the bulb and a second sleeve installed at the tip of the first sleeve; A sapphire disk and a laser oscillation unit installed inside the second sleeve; A cooling frame installed at the front end of the second sleeve, the cooling frame having a window built inside the cooling frame to form a refrigerant flow space between the window and the sapphire disk; A laser cathode ray tube comprising: a lens mount installed at the tip of the cooling frame; Laser cathode ray tube, characterized in that the embossed or scratch is formed on the bonding surface of the first sleeve bonded to the bulb.