TW521299B - Discharge tube and back projecting lamp using same and making method thereof - Google Patents

Abstract

The present invention relates to a discharge tube and back projecting lamp using same and making method thereof, and particularly to a discharge tube of back projecting lamp suitable for translucent display panel. Conventionally, in the translucent display panel for notebook computer, a back projecting lamp is arranged on the back of the liquid crystal unit for display by utilizing the back of the translucent display panel to illuminate light therefrom. However, in recent years, the tube diameter must be made thin due to the requirement if small size and light weight. Therefore, to solve the problem, the object of the present invention is to provide a discharge tube and its manufacturing method suitable for making the tube diameter of the liquid crystal display thin, and capable of preventing light emitting loss without encountering the problem of uneven luminance. Particularly, it is suitable for minimizing the size of discharge tube in applying to the back projecting lamp.

Description

521299 V. Description of the invention (1) [Technical Field] The present invention provides a discharge tube and a backlight using the discharge tube and a manufacturing method thereof, particularly a discharge tube suitable for a light source for a backlight of a transmissive display panel. . [Known technology] It is generally known that a transmissive display panel used in a notebook computer or the like is provided with a backlight on the back of the liquid crystal cell and displays the light from the back of the transmissive display panel. Because of the need for miniaturization and weight reduction, the diameter of the discharge tube needs to be improved. However, it is generally known to use a backlight discharge tube, which is formed on the inner wall of the tube to form a fluorescent layer. A fluorescent discharge tube formed by sealing mercury vapor inside the tube requires a certain degree in order to form a fluorescent layer inside the tube. It is impossible to make the outer diameter of the thick tube 1 below 1 · 8 min. Therefore, as shown in FIG. 26, in a conventional tube 1GG having a thickness of 2.0 mm, the light irradiated outside the light guide plate 135 in the tube 1GG passes through and is reflected by the reflective layer 150 of the electric tube 100. Attenuation occurs when passing through the discharge tube 135 again. From this specific example, it can be seen that if a 2.0 mm diameter discharge tube is used on the incident side rabbit 2 = n thick light guide plate, the incidence efficiency% 1 is this: ί Λ 8: 1 diameter discharge tube is increased by 1 5 If the right angle decreases, the incidence efficiency will increase again. Because of the U. ^ efficiency of human shots' relative to the thickness of the light guide plate 2.—, it is necessary to have a small-diameter discharge tube with k smaller than 1.5 mm. J: As an example of the manufacturing method of the discharge tube, first, the glass & garden b where a phosphor layer is formed on the inner wall is placed on both ends of the tube body 112 made by Jing Jing

521299 V. Description of the invention (2) = at electrode 25, connect & 112 for entering mercury getter 149 in the center of the tube, then 'seal both ends of the tube body 112, make the tube 112 part in a vacuum state, and introduce discharge Gas, and then seal the front end of the tube 112, these are the mercury from the mercury getter 1 4 9 to introduce mercury vapor into the inner part of the tube body 112, and then the connection between the tube 113 and the tube body 112 is sealed. In this case, under the processing condition that the central part of the tube seals the tube 113, it is easy to produce a "shaped" problem: the phosphor layer is inconsistent and the brightness is inconsistent. 丄 In order to solve the above problems, the first object of the present invention is mainly to provide Y &A; Yttrium, used for liquid crystal displays, and the tube diameter is not only made small, and can prevent light consumption, without the need to worry about the occurrence of uneven brightness of the discharge tube and its manufacturing method, especially applied to the discharge tube of the backlight Miniaturization. The following is an example of another conventional ultraviolet discharge tube 60 as shown in FIG. 27. The discharge tube 60 is provided with a gas-tight container 66, including a tube body portion 62, which is formed by an elongated body. UV rays such as quartz glass The composition and the sealing portion 64 are formed by melt-sealing the openings at both ends of the tube body portion 62, and a pair of discharge electrodes 68 are respectively disposed near the sealing portion 64 in the air-tight container. The tube body portion 62 of the container 66 is filled with the discharge gas during the ultraviolet generation period. 'The discharge electrode 68 is composed of a slightly funnel-shaped tungsten, and the front end portion is exposed in the tube body portion 62 of the air-tight container 66. At the same time, the base end portion is welded. The molybdenum foil 70 embedded in the airtight container 62 is sealed in the sealing portion 64. One of the lead terminals 72 made of tungsten is also connected to the molybdenum foil 70. In addition, the other end of the lead terminal 72 is led to The outer part of the airtight container 6 6. In this way, in the conventional discharge tube 60, a flip box is embedded in the sealing portion 64. Page 5 521299 5. The reason for the description of the invention (3) is 'constitute airtightness' The melting point of the ultraviolet-transmissive glass such as quartz glass of the container 66 is very high (for example, the melting point of quartz glass is above 2000 degrees ^ 'so' the melting point of the metal enclosed in the sealing portion 64 must be higher than that of the above-mentioned quartz glass and other ultraviolet penetrations) The melting point of glass so that it is in the body of the molten tube 6 2 It does not melt when the seals 64 are formed at both ends of the opening. Metals with a higher melting point than the above-mentioned glass, such as molybdenum and tungsten, have different thermal expansion coefficients due to the thermal expansion coefficient of these metals and the thermal expansion coefficient of ultraviolet penetration glass. (For example, the thermal expansion coefficients of molybdenum and tungsten are tens of times the thermal expansion coefficients of quartz glass.) When these metals are sealed in the sealing portion 64, cracks may occur in the sealing portion 64 due to the above-mentioned difference in thermal expansion coefficient. (Cracking). Therefore, in the conventional technology, a very thin molybdenum foil 70 is buried in the sealing portion to reduce > the influence caused by the thermal expansion system of metals such as molybdenum and ultraviolet rays penetrating the glass to prevent A crack is generated in the sealing portion 64 and the discharge gas in the tube body portion 62 leaks to the outside. As mentioned above, since the base end portion of the discharge electrode 68 made of tungsten and the lead terminal 7 are embedded in the sealing portion 64, the sealing portion 64 of the portion that is in contact with the buried discharge electrode is in contact with the buried lead. Although the terminals 72 to the sealing portion 64 are prone to cracks due to the difference in the coefficient of thermal expansion between tungsten and ultraviolet through the glass, the discharge gas in the tube body portion 62 does not leak to the outside due to the difference between the thermal expansion coefficient valleys of tungsten and ultraviolet. As described in the seventh, in the conventional discharge tube 60, in order to prevent ultraviolet rays constituting quartz glass and the like from penetrating glass, and tungsten and the like constituting the discharge electrode 68, 21299, V. Description of the invention (4), due to the difference in thermal expansion coefficient between the properties. ㈣70 is sealed inside, which will make the discharge pattern, and the miniaturization requirements of the electric tube must be 64 in the sealing part, = ^ 6.0. 0 becomes larger, and the purpose of the present invention. Therefore, the second part of the present invention makes the length of the sealing part longer. Shorten it: the purpose is related, all are true. [Solution] g In order to achieve the above purpose, too peaceful. 〇 At the end of the light-emitting tube, the electric tube 'is mainly characterized by being connected to form a sealed tube connected to the pole by connecting the two ends of the right-angle tube to form a connected shape, so that the discharge tube is shaped like a light-emitting tube. Arrange and seal the pair of sealed tubes of the discharge electrode at the same time, and clamp the discharge electrode with the discharge electrode: the sealed tube of the eight sides is connected to the sealed tube. After sealing the part of the getter material, remove the fines. When the outer diameter is m.lU, the outer diameter can be made better than that of the sealed tube layer, and it is manufactured under a high vacuum: too f to uniformly coat the phosphor. Therefore, the body has its difficulty in the case of the small diameter. Because the phosphor layer is formed on the surface, in the invention described in the two or two cases, a common tube with a diameter of 4 mm from the outside of the light-emitting tube, that is, a suitable discharge tube sealed with a discharge electrode with an outer diameter of 3 and a dark portion (black area) 丨. The length is 5mm to 1.0mm, and if: the discharge tube of the invention is used: and the above discharge tube, in more detail, J: at least a light guide plate is provided-both ends of the end face are butted respectively Arrangement said, in the above-mentioned light-guiding double electric supervisor of each sealed tube on page 7 521299 V. Description of the invention (5)

1 w "/! W outside the sealing part, when asked, the one end surface of the light guide plate other than the second dense end portion is arranged along the butt, and the light emitting tube is arranged in the discharge tube [-once discharge occurs between the discharge electrodes ': The visible light produced is not only produced in the luminous tube' is produced in the body of the sealed tube = the visible light generated in the body of the tube can be emitted from the tube body and the second sealing portion. Therefore, each of the discharge tubes is placed in a backlight. The light-emitting tube of the second sealing portion is arranged so that visible light emitted from a portion placed on one end surface of the light guide plate is radiated to the upper surface of the one end surface of the light guide plate. In addition, in the above discharge state, the light-emitting tube is connected. The light-emitting tube is small. Therefore, in the case of the light-conducting tube, the light-emitting tube can be sealed with the base end of the light-emitting tube in the pair of sealing portions composed of ultraviolet-transparent glass glass in the present invention. The light-shielding tube electric tube and the light-tight tube inside the light-shielding tube electric tube other than the two ends outside the second sealing portion of the one-side sealing tube have long-incided visible light at one end other than the two ends of the light guide plate. In the middle of the second sealing portion, one end of the second dense light plate protruding near the outer end portion of the second sealing portion faces the one end surface of the light plate where the light plate is arranged to radiate the visible light efficiently. The two ends of the body part are formed with a sealing part; and a pair of parts, at the same time, the two ends of the front end part are respectively abutted with mating surfaces, and at the same time, along the butt end surface, the two sealed ends of the sealed tube can be arranged from the sealed end of the sealed tube, From the surface of the light-emitting tube, the light-emitting tube can be arranged outside the second sealing portion by changing the length of the outer surface to a substantially flat position protruding from the connecting portion of the tube body, and the light-emitting tube is incident into the light guide plate. A soft discharge electrode is bonded to the opening and exposed in the tube body part as described above.

Page 8 521299 Five invention descriptions ^ ο) '----- Within. The discharge gas used in the airtight container seal is filled with the discharge gas for generating ultraviolet rays and the discharge e-seal "enclosed the discharge electrode with soft glass." The soft glass has a higher thermal expansion coefficient than the ultraviolet penetration glass. When sealed in the sealed portion, cracks do not occur due to the difference between the coefficient of thermal expansion of the soft glass and the coefficient of thermal expansion of the discharge electrode. In the discharge tube of the present invention, there is no need to be familiar. In the discharge tube, a crack occurs due to a difference in thermal expansion coefficient between the ultraviolet penetration glass constituting the sealing portion and the gold electrode constituting the discharge electrode. The molybdenum enclosed in the sealing portion =, In this way, the length of the sealing portion of the conventional discharge tube can be shortened, and the miniaturization of the discharge tube can be achieved. Other features are described in the following examples. [Embodiment of the invention] Fig. 1 shows a first embodiment of the invention of the present invention. An example of using the discharge tube of the present invention as a backlight is also shown. This figure is a schematic cross-sectional view of the main part of one example, and is composed of the discharge tube 10 and the light guide plate 35 as a light source. The discharge tube 10 is provided with a light-emitting tube 12 composed of an ultra-violet-transmitting glass such as an elongated quartz glass, and the two ends of the light-emitting tube 12 are connected to the light-emitting tube 12 in an orthogonal state at the two ends of the light-emitting tube. Glass consists of a pair of sealed tubes 14. The arc tube 12 is disposed along one end surface of the light guide plate 34, and the pair of sealing tubes 14 are disposed along an end surface orthogonal to the one end surface on which the arc tube 12 is disposed. The above-mentioned sealed tube 14 has a straight tubular body portion 16 and the tube is melted and sealed

521299 V. Description of the invention (7) A pair of sealing portions 18, 19 formed by opening both ends of the body portion 16. A part of the discharge electrode 20 and the lead terminal 22 are sealed in the sealing portion 18, and the front end portion of the discharge electrode 20 protrudes toward the sealing portion 18 and is piped out. At the same time, the 'base end portion and the lead end end embedded in the sealing portion 8 connection. The other end of the lead terminal 22 protrudes toward the seal. A hole 26 having the same diameter as the arc tube 12 is formed in the tube body portion 16 of the sealed tube 14, and the hole 26 and the inside of the arc tube 12 are communicated with each other in a state where the sealed tube 14 and the arc tube 12 communicate with each other, so that the mouth of the arc tube is formed. The end faces of the sealing tube 14 are joined to the outer surface of the sealed tube 14, thereby forming an airtight 28 0. The gas selective container 28 is filled with a phosphor on the outer surface of the discharge gas light tube 12 for generating ultraviolet rays. This step is omitted in the figure. Further, if a discharge is generated between the discharge electrodes 20 by applying a pair of lead terminals 22 to the discharge tube 10, electrons and ultraviolet rays are radiated to emit ultraviolet rays of various wavelengths. The emitted ultraviolet light passes through a light-emitting structure made of ultraviolet-transmitting glass and is attached to a phosphor outside the light-emitting tube 12 to generate visible light. The light is diffused and reflected by the light guide plate 35 to form light that is directed toward the transmissive display panel side (not shown) of the guide. In the above-mentioned discharge tube 10, only 12 is arranged along one end surface of the light guide plate 35, and since there is no sealing portion 18 that does not contribute to the generation of visible light, a large amount of visible light is guided to the light guide plate 35-the end surface side. Moreover, the arc tube 12 and the sealed tube 14 are connected in a substantially orthogonal state, and one of them is dense. Then, the inner diameter of a part 18 of the exposed part 22 in the body 16 is slightly the same. The container is opened at both ends and the voltage is generated. Then, the gas flushes the tube 12 and excites the visible light plate 35. Discharge tube 10 to sealed tube

Page 10 521299 V. Description of the invention (8) 14 is arranged along an end surface orthogonal to one end surface of the light guide plate 35 where the light emitting tube 12 is arranged, so that the size of the backlight can be reduced. 2 (a) to 2 (c) show a method for manufacturing the discharge tube 10 of the present invention. First of all, ^ insert ^ of the discharge electrode 20-to the sealed tube! 4 spaced side-by-side state == 'Place the two ends of the light-emitting tube 12 and each of the two sealed tubes 14 at the slightly central part: connect. Place water on the opposite side of the discharge electrode 20 of one of the sealed tubes 14 and absorb The aerosol agent 49, 所示, as shown in FIG. 2b, seals the other 3 ends of the sealing tube 14 with the exception of the previous $ '. Then, the inside of the sealing tube 14 is evacuated from the front end thereof, a discharge gas is sealed therein, and the connection portion of the tube 12 is sealed. For the first time, mercury vapor is introduced into the light-emitting tube 12 from the mercury getter 49, and one of the sealing tubes 14 is sealed from the connection part with the light-emitting tube 12. In the case of: surface, the outer peripheral surface of the light-emitting tube 12 is directly: or the phosphor powder is mixed with an adhesive with an adhesive for coating, or the phosphor is stirred, and the surface is covered with fluorescent light The phosphor film of the body film is provided with a phosphor layer, so that the discharge tube 10 of the present invention is completed. As shown in FIG. 1, in the discharge tube 10 of the present invention, only a light-emitting tube without a dark part (black area) can be arranged on the light guide plate π 2 side, and the light guide plate can be irradiated with uneven brightness. At the same time, by arranging the sealing tube 14 on the side of the light guide, the sealing tube 14 can be disposed on the side of the light guide plate 35 with good efficiency. , 'J, between a pair of sealed tubes enclosing the discharge electrode, the outer diameter is smaller than that, and the light is connected. A getter material is pre-arranged in the sealed tube, and then the sealed tube and the After the inside of the arc tube is in a vacuum state,

521299 V. Description of the invention (9) Seal the sealed tube part equipped with getter material, make the luminous tube thinner than the sealed tube, so it can avoid the occurrence of tube when the tube with the getter material is sealed in the center of the discharge tube. The surface deformation causes uneven brightness. In addition, since the pair of sealed tubes are bent at a right angle with respect to the light-emitting tube interposed therebetween, by arranging only the light-emitting tubes on one side of the light guide plate of the backlight of the liquid crystal display, optimal light irradiation without uneven brightness is obtained. , And the sealed tube can be arranged on the side of the light guide plate with good storage efficiency. ^ The mercury tube is sealed inside the luminous tube, and the glory layer is formed on the tube surface, and then the phosphor layer is excited by the ultraviolet rays generated by the discharge between the discharge electrodes, and the best luminescence is obtained, and the phosphor layer is formed outside the luminous tube, and Compared with the case where a phosphor layer is formed in the inside, the arc tube can be made thinner. Fig. 3 is a sectional view of a second embodiment of the present invention. The light-emitting tube 12 ′ is made of hard glass with ultraviolet transmission characteristics, and a pair of sealed tubes 14. The two ends of the light-emitting tube 12 are connected to the light-emitting tube 12 in a substantially orthogonal state. °; consisting of hard glass with ultraviolet transmission characteristics. s14, there is a straight g-shaped body portion 16, and a first sealing portion 18, a second sealing portion 19, and a first sealing portion 19 which are melt-sealed to the tube body portion 16; the first electrode is sealed with a discharge electrode 20 and a lead in P18. The terminal takes part. Then, the front end portion of the discharge electrode 20 protrudes to Chu ^. T Q,, ^ ^ ^ A code is out of the first sealing portion 18 and is exposed at the heart 9. At the same time, the base end portion and the buried portion The lead wires in the first sealing portion 18 are connected to each other, and the other end of the lead terminal 22 is slightly flat toward the outer surface 19 a of the first and second branch seal portion 19.

$ 12 pages 521299 V. Description of the invention (10) Furthermore, 'the cylindrical bodies 24, 24 are inserted into the left and right ends i2a, 12b of the arc tube 12, respectively. The cylindrical body 24 is made of quartz glass (dazzling point of about 2000 degrees), which is a light-transmitting material, and has hardened glass (melting point of about 800 degrees) than the hard glass constituting the arc tube 12. As described above, with the cylindrical body 24 made of a translucent material such as quartz glass, the cylindrical body 24 cannot block the light emission from the ultraviolet rays of the light emitting tube 12, and thus does not cause a reduction in the light emitting area of the light emitting tube 12. In addition, as the constituent material of the aforementioned quadrangular body 24, an opaque material such as ceramics or aluminum having a higher melting point than the rigid glass constituting the arc tube 12 may be used. At this time, in order to control the reduction of the light emitting area of the arc tube 12, it is desirable to shorten the length of the cylindrical body 24 to the extent possible. It should be noted that a part of the above-mentioned punctiform body 24 may be inserted and arranged from the end portions 12a and 12b of the arc tube 12 in a slightly protruding state. In the tube body portion 16 of the loosely sealed tube 14, a hole 26 having a diameter approximately the same as the outer diameter of the arc tube 12 is formed near the second sealing portion ι9, and the ends 12a and 12b of the arc tube 12 are inserted into the tube from the hole 26 In the body portion 16, the light-emitting tube 12 and the tube body portion 16 are connected to each other, and the outer edges of the light-emitting tube upper ends 2a, 12b and the sealing tube 14 are joined to form an airtight container 28. As described above, 'the outer edge i9a of the first sealing portion 19 is substantially flat, and at the same time, the arc tube 12 is connected to the tube body portion μ at a position near the second sealing portion 19, so that the' projecting from the outer end portion 12c of the arc tube 12 The protruding length of the second sealing portion 19 does not exceed the wall thickness of the second sealing portion 19, and is made extremely small. Furthermore, as shown in the figure, although the protruding length of the second sealing portion 19 protruding from the outer end surface 12c of the arc tube 12 has been emphasized, in fact, since the arc tube 12

Page 13 521299 V. Description of the invention (11) '一 · The outer diameter is 1 ~ 2mm, so the protruding length does not exceed the micrometer unit. The above-mentioned airtight container 28 is filled with ultraviolet rays? Biodischarge gas, such as ultraviolet radiation gas formed by mixing argon and mercury, or external radiation gas mainly composed of gas 'and' is omitted from the outside of the light-emitting tube 12 and the second sealing portion of the sealing tube 14 as shown in the figure. A phosphor is attached to the outer edge 19a. FIG. 4 is a sectional view of a backlight 32 using the discharge tube 10 described above. The backlight 32 is provided with a first discharge tube 10 as a light source and a rectangular light guide plate 35 made of transparent acrylic resin. As shown in Fig. 5, a light diffusion plate 36 is bonded to the surface of the light guide plate 35, and a light reflection plate 38 is bonded to the back surface. The light guide plate 35-the two end portions of the end face are arranged to abut the second sealing portion 19 of the sealing tube 14 and the outer edge 19 a of the sealing tube 14, and the second sealing portion 9 is arranged along the other end portions of the outer edge 19 a of the second sealing portion 9. The arc tube 12 is disposed on the end surface. As a result, both the arc tube 12 and the sealing tube 14 of the discharge tube 10 are disposed inside both ends of one end surface of the light guide plate 35. As described above, the second sealing portion 19 protruding from the outer end portion 12c of the light-emitting tube 12 has an extremely small protruding length. Therefore, the outer edge of the second sealing portion 9 and the one end of the light guide plate 35 face each other. In the case of arrangement, the end surfaces of the light-emitting tube 12 and the light guide plate 35 can be arranged close to each other. Therefore, the visible light emitted from the light-emitting tube 12 can be efficiently incident into the light guide plate 35. Then, a voltage is applied to the first discharge tube 10 by a pair of lead terminals 22, and a discharge occurs between the discharge electrodes 20, and the electrons impinge on the ultraviolet radiation gas in the light-emitting tube 2 and the tube body portion 16 of the sealing tube 14. Therefore, it emits ultraviolet rays of various wavelengths. The ultraviolet light emitted from the arc tube 12 stimulates the phosphor attached to the outer surface of the arc tube 丨 2 to emit visible light, and the visible light emitted from the arc tube 12 is self-guided.

Page 14 521299 V. Description of the invention (12) One end of the light plate 35 is incident into the light guide plate 35. In addition, the ultraviolet rays radiated from the tube body portion 16 of the sealed tube excite phosphors attached to the outer edge 19a of the second sealing portion to emit visible light, and the visible light emitted from the second sealing portion 19 is also emitted from both sides of the light guide plate 35. The end is incident into the light guide plate 35. As a result, visible light can be incident through the entire length of the light guide plate 35—the end face. The visible light incident into the light guide plate 35 is reflected and advanced inside the light guide plate 35, and is emitted to the light guide plate 35. The visible light on the back side is reflected to the front side by the light reflecting plate 38. Therefore, visible light can be emitted from the entire area of the surface of the light guide plate 35. The visible light emitted from the surface of the light guide plate 35 is diffused by the light diffusion plate 36 to be directed toward the surface. The light on the side of the transmissive display panel (not shown) arranged above the light guide plate 35. Next, the manufacturing method of the first discharge tube 10 will be described with reference to Figs. 6 to 9. First, the discharge electrode 20 and the lead terminal 22 are connected first. The connected discharge electrode 20 and the lead terminal 22 are self-made? The one end side of the hard glass tube 41 which is the base of the sealed tube 14 is inserted into the hard glass tube 4. At this time, the other end of the lead terminal 22 is It is set to protrude outside the hard glass tube 41. In this state, the ends of the discharge electrode 20 and the lead terminal 22 of the hard glass tube 41 are inserted by heating and melting, and then cooled and solidified to form the first seal. 1 18. Then, 'a hole 26 is formed in the body portion 16 of the hard glass tube 41 which has the same diameter as the outer diameter of the arc tube 12. This hole 26' is after heating the body portion 16 of the hard broken glass tube 41, It is formed by blowing in a gas such as nitrogen or air in a softened state. Further, a laser beam is irradiated on the body portion 6 of the hard glass tube 41 to form a tube.

IH8 Page 15 521299 V. Description of the invention (13) The hard glass of the body 16 can also form the hole 26 by evaporation. In this case ', in order to prevent the laser beam from being irradiated onto the pipe body portion 16 located behind the formation of the hole 26 in the pipe body portion 16, it is necessary to insert a shielding member that blocks the laser wire into the pipe body portion 16. In addition, the holes 26 may use water containing fine sand particles to continuously flow on the surface of the pipe body j 6, and at the same time, apply ultrasonic waves to the water flowing through the formation of the holes 26 to cut the pipe body from the sand particles in the water. Parts 16 are formed. The hole 26 may be formed by melting the tube body portion 16 of the hard glass tube 41 using a micro burner. In addition, in the case of the method of forming the holes 26 using a laser line and the method of forming the holes 26 by using sonic vibration of water containing minute sand particles, the shape and size of the holes 26 are relatively easy to control. Next, after inserting and disposing the cylindrical body 24 in the end portions 12a and 12b of the arc tube 12, as shown in FIG. 7, the end portion 12a of the arc tube 12 is inserted into the tube body portion of the hard glass tube through the hole 26. In 16, the light-emitting tube 12 and the hard glass tube 41 are communicated. Then, as shown in FIG. 8, the burner 42 is used to heat the light-emitting tube 12 at a temperature higher than the melting point of the hard glass constituting the light-emitting tube 12 and the hard glass tube 41 and lower than the melting point of the cylindrical body 2 4. After the end portion 12a and the hole 26 of the hard glass tube 41 are melted, both the light-emitting tube 12 and the hard glass tube 41 are melted, and then cooled and solidified, and then the light-emitting tube 12 and the hard glass tube 41 are welded together. As described above, the luminous tube 12 and the sealed tube 14 made of the same hard glass have the same thermal expansion coefficients, so the bonding properties are excellent. The rigid glass tube 41 is joined to the two end portions 12a and 12b of the light-emitting tube 12, respectively.

Page 16 521299 V. Description of the invention (14) After exhausting the hard glass tube 41 from the other end side of the hard glass tube 41 through the exhaust device (not shown), the gas in the hard glass tube 41 and the light-emitting tube 12 is exhausted to form a high vacuum state. , Filled with ultraviolet radiation. Then, as shown in FIG. 8, the other end side of the hard glass tube 41 near the melting hole 26 is heated by the burner 32 and sealed. Then, as shown in FIG. 9, on the other end side of the pressurized hard glass tube 41 The second seal portion 19 whose outer surface 19a is formed into a substantially flat shape is formed after it is 'cooled and solidified'. Finally, a phosphor is attached to the outer edge of the arc tube 12 and the outer edge 19a of the second sealing portion of the sealing tube 14, and the discharge tube 10 shown in FIG. 3 is completed. In the manufacturing method described above, the cylindrical body 24 made of a material having a higher melting point than the hard glass constituting the light-emitting tube 12 is inserted into the end portions 12 a and 12 b of the light-emitting tube 12. The hard glass of the tube 14 (hard glass tube 41) has a higher melting point and is heated at a temperature lower than the melting point of the cylindrical body 24, and then the ends 12a, 12b of the light-emitting tube 12 and the sealed tube 14 are electroformed, and during the welding, Even if the ends 12a and 12b of the arc tube 12 are melted, the cylindrical body 24 is not melted. Therefore, it is possible to prevent the inside of the end portions 12a, 12b from being blocked due to melting or deformation of the arc tube 12 due to heat. In addition, since the end portions 12a and 12b of the light-emitting tube 12 are inserted into the tube body portion 16, it is also possible to prevent the sealed or sealed tube 14 that is melted or thermally deformed from entering the end portions 12a and 12b caused by the end portions 12a and 12b of the light-emitting tube 12. Occlusion. Next, a third embodiment of the present invention is shown. The backlight 32 of FIG. 10 is provided with a discharge tube 10 as a light source and a substantially rectangular light guide plate 35 made of transparent acrylic resin. The outer surface 19a of the second sealing portion 19 of the discharge tube 10 is substantially spherical.

Page 17 521299 V. Description of the invention (15) Further, 'the light-emitting tube 12 is connected to the tube body portion 16 under the second sealing portion 19' is different from the discharge tube 10 described above. Therefore, in the discharge tube 10 of this embodiment, 'a part of the tube body portion 16 and the sealing portion 19 protrude from the outer end portion 12c of the light emitting tube 2', the protruding length thereof is longer than that of the sealing portion outer surface 19a of the discharge tube 10 The protrusion length should be long. In the discharge tube 10 of this embodiment, not only the outer edge 19a of the second sealing portion 19 but also the outer surface of the tube body portion 16 protruding from the outer end portion 12c of the light-emitting tube 12 has phosphors attached thereto. Furthermore, in the discharge tube 10 of this embodiment, as shown in the manufacturing procedure of Fig. 8, the other end side of the hard glass tube 41 at a position above the hole 26 is heated by a burner 32, and after being sealed, it is cooled and solidified to be manufactured. In addition, 'the rectangular cutouts 48 are formed on the left and right ends of the light guide plate 35 of the backlight 32' along the one end surface where the cutouts 48 are not formed, but the arc tube 12 of the second discharge tube 46 is butted. A tube body portion 16 and a second sealing portion 19 protruding from the outer end portion 12c of the arc tube 12 are disposed in the cutout 48. As a result, both the light-emitting tube 12 and the sealed tube 14 of the discharge tube 10 are arranged in both ends of the light guide plate 35 -the end surface. Then, if a voltage is applied to the discharge tube 10 through a pair of lead terminals 22, a discharge phenomenon occurs between the discharge electrodes 20, and in the light-emitting tube 12 and the tube body portion 16 of the sealed tube 14, electrons impinge on ultraviolet radiation. The gas emits ultraviolet rays of various wavelengths. The ultraviolet light radiated in the arc tube 12 excites the phosphors attached to the outer edge of the arc tube 12 to generate visible light, and the visible light emitted from the arc tube 12 is incident into the light guide plate 35 from one end surface where the cutout 48 is not formed. Furthermore, the ultraviolet rays emitted from the tube body portion 16 of the sealing tube 14 excite the outside of the second sealing portion 19a and

Page 18 521299 V. Description of the invention (16) The phosphors attached to the outside of the two parts 16 generate visible light, and the visible light emitted from the first part 19 and the tube body part 16 also enters the light guide plate 35 from a place where the cutout 48 is formed. Inside. As a result, visible light is totally incident through one end surface of the light guide plate 35. i In the above, as the glass constituting the light-emitting tube 12 and the sealed tube 14, the hard glass having ultraviolet transmission characteristics is described as an example, but it is not limited to this. For example, quartz glass such as quartz glass may be used. Glass is used as a constituent material of the arc tube 12 and the sealed tube 14. In addition, the inside of the arc tube 12 and the tube body portion 16 of the sealing tube 14 are covered with a glare body, and at the same time, the arc tube 12 and the tube 14 can be made of a material having translucency. In the discharge tube of the present invention, if a discharge occurs between the discharge electrodes, visible light generated thereby is generated not only in the light-emitting tube but also in the sealed tube body. The visible light generated in the tube body portion can be transmitted from the tube body portion and the first portion. The two seals emit radiation. Therefore, in the blame lamp of the second embodiment of the present invention provided with the discharge tube and the light guide plate, the first and second males of the #seal tube of the discharge tube are buttedly arranged on both ends of one end surface of the light guide plate, respectively. At the same time, outside the sealing portion, at the same time, one end face of the light guide plate other than the two ends of the second sealing portion is arranged along the butt. By disposing the light emitting tube, both the light emitting tube and the sealing tube of the discharge tube can be arranged on one end face of the light guide plate. Both ends can reduce the size of the backlight. In addition, the visible light emitted from the second sealing portion of the sealing tube is incident on both end portions of one end surface of the light guide plate, and the visible light emitted from the light emitting tube is incident on one end surface other than the two end portions. Full-length incident

Page 19

Visible light. In addition, the light-emitting tube is visible from the light to make the second accessible, and at the ends of the electric tube, the end of the electric tube protrudes and seals the light from the outside to the incision, and the second and the sealed part of the second tightly sealed portion are visible. The light-changing surface is close to the shape of the light guide plate and is not shaped along with the incident light guide plate due to the close and second closeness of the light guide plate. In addition, the outer edge of one end face of the seal portion is located near the one end face of the projection portion of the seal portion and is arranged inside the light emitting plate. In the backlight, the above-mentioned notch sealing portion is formed by the notch, and one end surface of the notch can be passed through the discharge tube to pass through the discharge tube, and the second end of the light guide plate can protrude from the outer end of the second tube. In the third aspect of the present invention, the configuration of the cutout, the light pipe, and the tube body tube that is simultaneously released is miniaturized. There is an end surface forming the cutout formation. The light 0 is slightly flat and is connected to the tube body. The output length is small. Therefore, in the case of a butted arrangement, the light pipe radiates from the light emitting tube, and one end face of one end face of the light guide plate is arranged. In order to obtain the visible light emitted from the backlight tube, the entire length of one end surface of the incident light guide plate, which is radiated from the visible light input tube, is then inserted into the discharge tube of the fourth embodiment. As shown in FIG. 11, is the discharge tube 10 of the present invention working? A tube body 16 composed of an elongated ultraviolet-penetrating quartz glass tube is opened at both ends, and a pair of sealing portions 18 composed of soft glass are joined to seal the openings at both ends of the tube body portion 16 to form a gas. The tight container 28. The sealing portion 18 has a tubular protrusion 14a on its hip end, and the inner diameter of the tubular protrusion i4a is made slightly larger than the outer diameter of the tube body portion 16. In addition, the tubular body portion 16 and the dense portion of the tubular protrusion portion 14a are inserted into an end portion of the tubular body portion 16 in a state where they are inserted.

Page 20 V. Description of the invention 的 Joining of the sealing portion 18. section. Each: Enclose the discharge electrode at 2 ° and the -base end of the lead terminal 22? Ϊ The front end portion protrudes to the outside of the sealing portion 18, and at the same time, the-end of the lead terminal 22 in the Hit sealing portion 18 is connected. The sealing portions 18 are joined to the openings at the other ends to form an air-tight container 28. Under two conditions, the front end portion of the & electric electrode 20 goes out to the tube portion of the air-tight container 28. -The end air-tight container 28 is external, and the inside of the air-tight container 28 is 'ultraviolet light?' The discharge gas is generated by using ultraviolet radiation gas such as a mixture of argon and mercury, or ultraviolet radiation gas mainly composed of xenon. Then, a voltage is applied to the discharge tube 10 through a pair of lead terminals 22, and a discharge is generated between a pair of discharge electrodes 20 disposed near the sealing portion 18 at both ends of the airtight container 28, and the electrons strike the ultraviolet radiation gas. Emit ultraviolet rays of various wavelengths. The airtight container 28 of the discharge tube 10 is manufactured by the following method. First, the discharge electrode 20 and the lead terminal 22 are connected in advance, and the connected discharge electrode 20 and the lead terminal 22 are inserted into a flexible glass tube (not shown). At this time, the other terminal of the lead terminal 22 is arranged to protrude outside the flexible glass tube. In this state, the soft glass tube is heated and melted, and then cooled and solidified to form the sealing portion 18. At this time, a certain amount of the soft glass tube is melted without heating at one end side, leaving the glass tube state, and the tubular protrusion 14a can be formed.

f. Insert the tube body portion 16 formed by the quartz glass tube and the tube projection portion 14a of the sealing portion 18 into the shaped projections 14 «W 4 with two blades in this state.邛 1 After heating and melting near 4a, the cold-sealed portion 1 »^ c solidifies the cold portion, and then can be joined with the seal 18 and the tube body 16 to form an air-tight container 28. As described above, since a tubular protrusion having an inner diameter larger than the outer diameter of the pipe body portion 16 is formed on the sealing portion 18, and the both ends of the pipe body portion 16 are inserted into the seal portion 18, the seal can be formed at the upper tubular protrusion portion. The positioning of the portion 14a becomes sluggish. Make the reading. The joining of m and the pipe body 16 In the present invention, the sealing portion 18 enclosing the discharge electrode 20 and the lead pin 22 is made of soft glass. The soft glass has a property that the melting point of the quartz glass is lower than that of the quartz glass (the melting point of the quartz glass is about 2). 〇〇〇 ^^ or higher and the melting point of soft glass is about 600 degrees), the thermal expansion coefficient is large (the thermal expansion coefficient of soft glass is 10 times or more than the thermal expansion coefficient of quartz glass 1 〇 Therefore, the discharge electrode is sealed in the sealing portion 18 In the case of 20 and lead terminals 22, cracks do not occur due to the difference between the coefficient of thermal expansion of the soft glass and the coefficient of thermal expansion of the metal constituting the discharge electrode 20 and the lead terminals 22. Therefore, the existing discharge tube 60 (Fig. 27) In order to prevent cracks caused by the difference in the thermal expansion coefficient of the quartz glass constituting the sealing portion 64 and the thermal expansion coefficient of the metal constituting the discharge electrode 68, the molybdenum foil 70 enclosed in the sealing portion 64 is not included in the case of the discharge tube 10 of the present invention. It is necessary to reduce the size of the discharge tube in this way because the length of the sealing portion 64 can be shortened compared with the conventional discharge tube 60. Furthermore, the seal of the present invention is configured. Soft glass 18 due to a low melting point as described above, it is unnecessary to use a high melting point quartz glass as the sealed portion 64

Page 22

521299 V. Description of the invention (20) As a constituent material of the discharge electrode 68 and the lead terminal ^ like the discharge tube 60, it is necessary to use a high melting point metal such as tungsten and molybdenum. For example, iron-plated copper-iron-nickel alloy wire can be used. The degree of freedom in selecting the constituent materials of the discharge electrode 20 and the lead terminals is high. In the above, although the case where the seal portion 18 and the pipe body portion 16 are directly joined is IS—the soft glass constituting the seal portion 18 and the stone m = coefficient constituting the pipe body portion 16 have a large difference, so the seal portion 18 and the pipe body have a large difference. In the second process condition, since the seal and the material 34 are exposed to cracks during joining, as shown in FIG. 12, it is preferable to join the sealing portion 18 and the pipe body portion 16 with the sealing material 34. ^ = Point ratio of the thermal expansion coefficient of approximately the median of the soft glass constituting the sealing portion 18 and the number of materials constituting the glass 2: ί = The slurry-like sealing material 34 is applied to both ends of the pipe body portion 16 However, the tubular projection A inserted into the sealing portion U at both ends of the tube 16 is π-shaped. After the sealing material 34 is heated and melted, the sealing portion 18 and the pipe body are passed through the sealing material 34. Portion 16 is joined. As mentioned above, due to the sealing material and the thermal expansion coefficient of quartz glass, the expansion coefficient is approximately equal to the expansion coefficient, so the difference between the thermal expansion coefficient and the material structure of the soft glass can be determined by the sealing material ^ J Coefficient and the coefficient of thermal expansion of the quartz glass, the tube body portion is closed, and as a result, the seal is improved and, as shown in FIG. 13, the seal portion 18 and the tube body portion 16 can also pass between two 521299. V. Description of the invention (21) That is, in 圏 13, in r㈣ 二 V 二 r 二 and the material i == 3 = material :: = any-one, all have a lower melting point than the quartz glass composed of ^ body portion 16, and Πΐίquality; A glass material having a thermal expansion coefficient between the thermal expansion coefficient of glass and the thermal expansion coefficient of quartz glass. Moreover, the thermal expansion coefficient of: = r34c increases from the first sealing material 34a to the first j-junction material 34b, and the third sealing material 34c in order. ~, A .L " :: r4rr3; c:, ^ coefficient, please 〜C has the largest thermal expansion expansion material: material with the coefficient of thermal expansion of the first-sealing material paper junction material 34. The thermal expansion coefficient is roughly in the middle: 3, between the tube body portion 16 made of quartz glass with a small thermal expansion coefficient and the sealing portion 18 made of soft glass / soft glass with a large expansion coefficient. The first to third seals with the thermal expansion coefficients on the side of the part 18 increasing sequentially: and the body: 3 = layer. So 'as shown in FIG. 12, compared with the time when only the first sealing material is inserted between the sealing parts. Because of the difference between the thermal expansion coefficient of Ϊ and the thermal expansion coefficient of quartz glass,

The materials 34a to 34c of u are more softly absorbed, and the bonding characteristics of the sealing portion 18 and the pipe body portion 14 are further improved. Limb I

P.24 521299 V. Description of the invention (22) In addition, as described above, although all the glasses whose quartz glass has been described as the line penetration characteristics are exemplified as quartz glass, such as. The ultraviolet ray penetrates the glass of the tube body portion 16. However, the present invention is applicable to a hard glass having ultraviolet rays capable of transmitting ultraviolet rays. In the above-mentioned discharge tube, the sealing portion for sealing the discharge electrode is made of soft glass. The soft glass Since the coefficient of thermal expansion is larger than that of ultraviolet penetration glass, when the discharge electrode is sealed in the sealing portion, will it not be caused by the difference between the coefficient of thermal expansion of the soft glass and the coefficient of thermal expansion of the discharge electrode? Health crack. Therefore, in the existing discharge tube, in order to prevent cracks and cracks due to the difference in the thermal expansion coefficient between the ultraviolet rays constituting the sealing portion and the metal constituting the discharge electrode, the pig was sealed in the male seal portion, but the discharge in the present invention There is no need for the tube, so that the length of the sealing portion can be shortened compared with the conventional discharge tube, so that the size of the discharge tube can be reduced. A discharge tube according to a fifth embodiment of the present invention is shown below. 14 is a cross-sectional view of a discharge tube 10 manufactured by the manufacturing method of the present invention. The discharge tube 10 does not include: a light-emitting tube 12, an ultraviolet-transparent glass such as an elongated quartz glass tube or a rigid glass tube having ultraviolet-transmission characteristics. A pair of tubes; a pair of sealed tubes 14 connected to both ends of the arc tube in a substantially orthogonal manner with the arc tube 12 and composed of soft glass. The sealing tube 14 has a straight tubular body portion 16 and a pair of sealing portions 18 and 19 formed by meltingly sealing the openings at both ends of the tube body portion 16. Within the pair of sealing portions 18 and 19, A part of the discharge electrode 20 and the lead terminal 22 is sealed in one of the sealing portions 18. Then, the front end portion of the discharge electrode 20 protrudes to the outside of the sealing portion 18 and is exposed in the tube body portion ι6. At the same time, the base end portion is sealed from the embedding.

Page 25 521299 rr ~ —____ V. Description of the invention (23) '---- = 1 One end of the lead terminal 22 is connected. The lead terminals 22 protrude outward from the sealing portion 18. In the tube body portion of the sealing tube 14, a hole 26 having the same outer diameter as that of the light-emitting tube 21 is formed, and an end portion of the light-emitting tube 12 is inserted into the tube T from the hole 26 so that the sealing portion 14 and the The light-emitting tube 12 is kept in a connected state, and the sealing material 26 is joined to the outer surface of the end of the light-emitting tube 12 and the sealing tube 14 to form an air-tight container 28. The airtight container 28 is filled with an ultraviolet radiation gas composed of a mixture of argon and mercury, or an ultraviolet radiation gas mainly composed of xenon, as a discharge gas for ultraviolet generation. A phosphor is attached to the outer surface of the arc tube 12. Then, when a voltage is applied to the discharge tube 10 through the pair of leads 22, a discharge occurs between the discharge electrodes 20, and the electrons collide with the ultraviolet radiation gas to emit ultraviolet rays of various wavelengths. The emitted ultraviolet rays pass through the light-emitting tube 12 made of ultraviolet-transparent glass and excite the phosphors attached to the outside of the light-emitting tube 12? Visible light. Hereinafter, a method of manufacturing the discharge tube 10 will be described with reference to FIGS. 15 to 19. First, first connect the discharge electrode 20 and the lead terminal 22, and pass through the connected discharge electrode 20 and the lead terminal 22? The flexible glass tube 40, which is the base of the sealing tube 14, is inserted into the flexible glass tube 40 with an open end. At this time, the other end of the lead terminal 22 is arranged to protrude outward from the flexible glass tube 40. In this state, after the side ends of the insertion discharge electrode 20 and the lead terminal 22 of the flexible glass tube 40 are heated and melted, the sealed portion 18 is formed by cooling and solidifying.

Page 26 V. Description of the invention (24) Next, a hole 26 is formed in the body portion 16 of the flexible glass tube 40 to have a diameter substantially the same as the outer diameter of the light-emitting tube 12. The holes 26 can be formed by heating the tube body portion 16 of the soft glass tube 40, and blowing the gas such as nitrogen or air in a softened state. Alternatively, the holes 26 may be formed by irradiating a laser beam 'on the body portion η of the flexible glass tube 40 to evaporate the soft glass constituting the body portion 16. In this case, in order to prevent the laser line from being irradiated onto the tube body portion 16 located behind the hole 26 of the tube body portion 6, it is necessary to insert a shielding member that blocks the laser line into the tube body portion 16. In addition, the water containing minute sand particles continuously flows through the surface of the pipe body portion 16, and at the same time, ultrasonic vibration is applied to the water flowing through the formation of the holes 26, and the pipe body portion 16 may be formed by sand particles contained in the water.所述 孔 26。 The hole 26. The hole 26 is also formed in the tube body portion 16 of the soft glass tube 40 using a micro-burner. Furthermore, in the case of the method of forming the holes 26 by irradiating a laser beam, and the method of forming the holes 26 by ultrasonic vibration of water containing fine sand particles, the shape and size of the holes µ are relatively easy to control. Next, after the slurry-shaped sealing material 26 is coated on the outer surface of the end portion of the arc tube 12, as shown in FIG. 17, the end portion of the arc tube 12 is inserted into the tube body portion 16 of the flexible glass tube 40 through the hole 26, so that The light-emitting tube 2 and the flexible glass tube 40 communicate with each other. The sealing material 26 has a melting point lower than that of the flexible glass constituting the flexible glass tube 40 and the ultraviolet-transmissive glass of the light-emitting tube 12, and has a thermal expansion coefficient of the soft glass and a thermal expansion coefficient of the ultraviolet-transparent glass. Material such as glass with a high coefficient of thermal expansion. 521299 V. Description of the invention (25) Then, as shown in FIG. 16, the burner 32 has a higher specific melting point and is better than the above-mentioned teachings &# ^ k 玎 ,,,. Material # 26-Acoustic, corroded: The melting point of the outer glass of the system is low 2: The material is heated and melted. After that, if the cold part is solidified at normal temperature, the soft glass tube 40 and the light-emitting tube 12 can be joined by the sealing material 26. In addition, although the thickness of the sealing material 26 is emphasized for convenience of explanation, the sealing material 26 is actually applied extremely thinly. After the flexible glass tube 40 is bonded to the two ends of the light-emitting tube 12, the soft glass tube 40 = the gas in the light-emitting tube 12 is exhausted from the other end of the soft glass tube 40 through an exhaust device (not shown). After the vacuum state is formed, ultraviolet radiation gas is filled. Thereafter, as shown in FIG. 17, the other end side of the molten soft glass tube 40 is heated by the burner 32 and sealed to form the sealing portion 9b. Finally, the fluorescent tube 12 is covered with a phosphor, and the discharge tube 10 shown in FIG. 14 is completed. As described above, in the present invention, the melting point is higher than the melting point of the corresponding sealing material 26, and it is heated and melted at a temperature lower than the melting point of the soft glass constituting the sealed tube 14 and the ultraviolet penetrating glass constituting the light-emitting tube 12. The sealing material 26 made of a material having a lower melting point than the soft glass constituting the sealing tube i 4 and the ultraviolet transmission glass constituting the light-emitting tube 丨 2 is then solidified by cooling, and the sealing material 26 is used as the sealing tube 14. Since it is bonded to the arc tube 12, the sealing tube 14 does not melt when the two are bonded. Furthermore, the sealing material 26 is made of a material having a thermal expansion coefficient of approximately the middle value of the thermal expansion coefficient of the soft glass constituting the sealed tube 14 and the thermal expansion coefficient of the ultraviolet penetrating glass constituting the light-emitting tube 12, so that the soft glass is thermally im mm. Page 28 521299 V. Explanation of the invention (26) The difference between the expansion coefficient and the thermal expansion coefficient of quartz glass is closed. As a result, when the sealed tube 14 and the luminous tube 12 are combined, they can 'prevent cracks caused by the difference in thermal expansion coefficient;' Both == Π shows other discharge tube manufacturers of the present invention: ;; 彳 中 2: the sealing tube is joined by a plurality of sealing materials of a laminated structure "i is the same as the above method, but also essentially: that is, in this manufacturing method In the case, as shown in FIG. 18, the first sealing material in the form of a slurry is applied on the outside ... The first two: the second sealing material 34b, and the third sealing in the form of a slurry is laminated on the second sealing material 34b. Junction material 34c. Ϊ́ ί ϊ i Ϊ, and any of the junction materials 34a to 34c has a melting point lower than that of the soft material, and the soft glass and the ultraviolet transmission glass constituting the light emission fl2 = f has the thermal expansion coefficient of the soft glass and UV into The thermal expansion coefficient between the thermal expansion coefficient of glass and other materials such as glass: the thermal expansion coefficient from the third sealing material 34a to 34c is from the light emitting & 11 sealing material 34a to the outer second sealing material 34b, the first The sealing material 34a has the smallest thermal expansion coefficient, and the third ancestor material 34C has the largest thermal expansion coefficient, and the second sealing material has the thermal expansion coefficient of the first sealing material 34a and the third sealing material. The thermal expansion coefficient of the thermal expansion coefficient is approximately equal to 34c. As shown in FIG. 19, the thermal expansion coefficient is higher than that of the first to third seals by the burner 32.

Page 29 521299 V. Description of the invention (27) The melting point of the junction materials 34a to 34c is lower than the melting point of the soft glass constituting the sealed tube 14 and the ultraviolet transmission glass constituting the light-emitting tube 12 2 Heating The first to third sealing materials 3 4a to 3 4c are melted. After that, if the first to third sealing materials 34a to 34c are cooled and solidified at room temperature, the first sealing material 34a and the first sealing material 34a connected to the light-emitting tube 12 are laminated on the first sealing material 34a. The second sealing material 341) is laminated on the second sealing material 34b, and a third sealing material 34c connected to the sealing tube 14 is bonded to the sealing tube 14 and the light-emitting tube 12. In this way, between the light-emitting tube 12 made of ultraviolet-transparent glass with a small thermal expansion coefficient and the sealed tube 14 made of soft glass with a large thermal expansion coefficient, the thermal expansion coefficient increases from the light-emitting tube 12 side to the sealed tube 14 side in order. Of the first to third sealing materials 34a to 34c, it is easier to pass multiple sealing materials 34a to 34c than when only a single sealing material 26 is sandwiched between the sealing tube 14 and the light emitting tube 12. The difference between the thermal expansion coefficient of the soft glass and the thermal expansion coefficient of the outer wire penetrating glass makes the joint between the sealed tube 14 and the light-emitting tube 12 further improved. In the discharge tube, a temperature higher than the melting point of the sealing material and a temperature lower than the melting point of the soft glass constituting the sealed tube and the ultraviolet-transmitting glass constituting the light-emitting tube is used for heating and melting to constitute the sealing portion. After the sealing material made of a soft glass and a light-emitting tube which penetrates through the ultraviolet light and has a low melting point, the sealing material is cooled and solidified, and the sealing material is used as a connection between the sealing tube and the light-emitting tube through the sealing material. The sealed tube is melted. In addition, since the thermal expansion coefficient of the soft glass constituting the sealed tube and the thermal expansion coefficient of the ultraviolet-transmissive glass forming the luminous tube is approximately the middle value of heat 521299 V. Description of the invention (28) The material of the expansion coefficient constitutes the sealing material. The difference between the thermal expansion coefficient of the glass and the thermal expansion coefficient of the ultraviolet penetration glass is determined by the sealing phase; as a result, the jointability of the sealed tube and the luminous tube is improved. When the two are 1, the thermal expansion coefficient is prevented from being different. Causes cracks. There is also 'the sealing material covered outside the two ends of the light-emitting tube is a multi-layer sealing material in a laminated structure', so the multiple sealing materials from the sealing material on the side of the light-emitting tube to the sealing material on the outside due to Its thermal expansion coefficient increases in order. 'So the difference between the thermal expansion coefficient of the soft glass constituting the sealed tube and the thermal expansion coefficient of the ultraviolet penetrating glass constituting the light-emitting tube can be better absorbed and sealed by multiple sealing materials. The bondability between the tube and the arc tube is further improved. Hereinafter, a sixth embodiment of the present invention will be described. FIG. 20 is a cross-sectional view of a discharge tube 10 manufactured by the manufacturing method of the present invention. The discharge tube 10 includes: a light-emitting tube 12 composed of a hard glass tube having ultraviolet transmission characteristics; a pair of seals & 14 ' The two ends 12a and 12b of the arc tube 12 are connected in a state substantially orthogonal to the arc tube 12, and are composed of hard glass with ultraviolet transmission characteristics, which is the same material as the arc tube. 〃 The sealing tube 14 includes a straight tubular body portion 16 and a pair of sealing portions 18 and 19 formed by fusion-sealing the openings at both ends of the tube body portion 16. One of the sealing portions 18 is formed in the pair of sealing tubes 18 and 19. A part of the discharge electrode 20 and the lead terminal 22 are sealed. Then, "the front end portion of the discharge electrode 20 protrudes outward from the sealing portion 8" is exposed in the tube body portion 16, and at the same time, the base end portion is connected to one end of the lead terminal 22 embedded in the sealing portion 18. The other end of the lead terminal 22 protrudes outward from the sealing portion 18.

Page 521 299

In addition, the cylindrical bodies 24, 24 are inserted into the two end portions 12a, 12b of the arc tube 12, respectively. The cylindrical body 24 is made of quartz glass (melting point: about 2000 degrees), which is a material having a higher melting point than the hard broken glass (having a melting point of about 800 degrees) constituting the arc tube 12 and a light transmitting property. In this way, since the cylindrical body 24 is formed of a light-transmitting material such as quartz glass, the cylindrical body 24 does not block the ultraviolet light from the light-emitting tube 12, and does not cause the light-emitting area of the light-emitting tube 12 to decrease. As the material constituting the cylindrical body 24, an opaque material such as ceramics or aluminum having a higher melting point than the hard glass constituting the arc tube 12 may be used. In this case, in order not to reduce the light emitting area of the arc tube 12 as much as possible, it is desirable to shorten the length of the cylindrical body 24 to the extent possible. In addition, a part of the tubular body 24 may be inserted into the hub in a state where the end portions 12a and 12b of the light-emitting tube 12 are larger than the right stem. A hole 26 having a substantially the same size as the outer diameter of the arc tube 12 is formed in the tube body portion 16 of the sealing tube 14. Insert the end portions 12a and 12b of the light-emitting tube 12 into the tube body portion 16 through the hole 26, and join the outer surfaces of the end portions 12a and 12b of the light-emitting tube 12 and the sealing tube 14 in a state where the sealing tube 14 and the light-emitting tube 12 communicate with each other. This constitutes an air-tight container 28. The airtight container 28 is filled with an ultraviolet radiation gas composed of argon and mercury, or an ultraviolet radiation gas mainly composed of xenon, as a discharge gas for ultraviolet generation. A phosphor is coated on the outer surface of the arc tube 12. Then, a voltage is applied to the discharge tube 10 by a pair of lead terminals 22, and a discharge occurs between the discharge electrodes 20. The electrons collide with the ultraviolet radiation gas, and emit ultraviolet rays of various wavelengths. Ultraviolet radiation transmitted through the glass

Page 32 521299 V. Description of the invention (30) The light-emitting tube 12 made of glass excites the phosphors on the outside of the light-emitting tube 12 to generate visible light. Hereinafter, a method for manufacturing the discharge tube 10 will be described with reference to FIGS. 21 to 23. First, the discharge electrode 20 and the lead terminal 22 are connected first, and the connected discharge electrode 20 and the lead terminal 22 are inserted into the hard glass tube 41 from one end side of the hard glass tube 41 which forms the basis of the sealed tube 14. At this time, the other end of the lead terminal 22 is arranged to protrude toward the hard glass tube 41. In this state, after the end portions on the insertion discharge electrode 20 and lead terminal 22 sides of the hard glass tube 41 are heated and melted, the sealing portion 18 is formed by cooling and solidifying. Next, a hole 26 is formed in the tube body portion 16 of the rigid glass tube 41 to have a diameter substantially the same as the outer diameter of the arc tube 12. The hole 26 can be formed by heating the tube body portion 16 of the hard glass 41 and blowing a gas such as nitrogen or air in a softened state. Alternatively, the hole 26 may be formed by irradiating a laser beam on the tube body portion 16 of the hard glass tube 41 to evaporate the hard glass constituting the tube body portion 16. In this case, in order to prevent the laser beam from being irradiated on the pipe body portion 16 located behind the hole 2 6 where the pipe body portion 16 is formed, it is necessary to insert a shielding member that blocks the laser wire into the pipe body portion 16. In addition, the water containing minute sand particles is continuously flowed on the surface of the pipe body portion 16, and at the same time, ultrasonic vibration is applied to the water flowing along the formation of the hole 26, and the pipe body portion 16 is also cut by the sand particles contained in the water. The hole 26 can be formed. The hole 26 may be formed in the tube body portion 16 of the molten hard glass tube 41 by using a micro-burner.

Page 521299 v ------------- ----------.----------------- Logic ... Round --- .. ......-V. Description of the invention (31); ground flow, while applying ultrasonic vibration to the water flowing along the formation of the hole 26, | the pipe body part 16 can be formed by the sand contained in the water b列 孔 2 6。 The hole 2 6. In addition, using a micro-burner, the tube body portion 16 of the fused hard glass tube 41 can also form the holes 26. Also, in the case of the method of forming the holes 26 using a laser line, and the method of forming the holes 26 using ultrasonic glass vibration with water containing fine sand particles, the size and shape of the holes 26 are easy to control. Next, after inserting the cylindrical body 24 into the end portions 12a and 12b of the arc tube 12, as shown in FIG. 21, insert the end portion 12a of the arc tube 12 through the hole 26 into the tube of the hard glass tube 41 In the body 16, the light-emitting tube 12 and the hard glass tube i | 41 are communicated. : Then, as shown in FIG. 2, by using the burner 32, near the end of the arc tube 12 | | portion 1 2 a and the hole 2 6 of the hard glass tube 41 to form the arc tube |

12 and the hard glass tube 41 have a high melting point of the hard glass and are heated at a temperature lower than the melting point of the cylindrical body i 4, and are heated at both the light emitting tube 12 and the hard glass tube 30 I: ί

丨 After melting, it is cooled and solidified, and the light-emitting tube 12 and the hard glass I: tube 41 are welded and joined. As described above, since the arc tube 12 and the sealed tube 14 are made of the same hard glass and have the same thermal expansion coefficients, they have excellent bonding properties.丨; After the hard glass tube 41 is joined to the two ends 12a and 12b of the light-emitting tube 12, respectively, it is discharged from the other end side of the hard glass tube 41 through an exhaust device (not shown). The hard glass tube 41 and the light-emitting tube 12 are placed. The gas inside becomes a vacuum state; after that, it is filled with ultraviolet radiation gas. Thereafter, as shown in FIG. 23, the other end side of the molten hard glass tube 41 is heated by the burner 13 2 and sealed to form the above-mentioned; | i seal portion 19. 1 521299 V. Description of the invention (32) The cylindrical body 24, meanwhile, has a melting point higher than that of the hard glass constituting the light-emitting tube 12 and the sealing tube 14 (rigid broken glass tube 41) and a lower melting point than the cylindrical body 24. The temperature is heated to weld the end portions 12a and 12b of the arc tube 12 and the sealing tube 14. Therefore, even if the end portions 12a and 12b of the arc tube 12 are melted during welding, the cylindrical body 24 does not melt. Therefore, the inside of the end portions 12a, 12b caused by the melting or thermal deformation of the light-emitting tube 12 can be prevented. In addition, since the end portions 12a and 12b of the light-emitting tube 12 are inserted into the tube body portion 16, it is also possible to prevent the sealed tube 14 caused by melting or thermal deformation from entering the end portions 12a and 12b of the light-emitting tube 12 to cause the end portions 12a, 12b Internal blockage.

In the above description, although the case of the sealed tube 14 made of hard glass of the same material as the arc tube 12 has been described, the present invention is also applicable to the case of the sealed tube 14 formed of a material different from that of the arc tube 12.

For example, the sealed tube 14 may be made of soft glass (melting point of about 600 ° C), which is lower in melting point than the hard glass and easy to process, and is inexpensive. In this case, after melting and sealing the sealing tube 14 at a temperature higher than the melting point of the soft glass constituting the sealing tube 14, the sealing tube 14 is welded to the ends 12a and 12b of the light-emitting tube 12 by cooling and solidification to perform the light-emitting tube. The ends 12 a and 12 b of 12 are joined to the sealing tube 14. In this case, since the above-mentioned heating needs to be performed at a temperature much higher than the melting point of soft glass in order to rapidly melt the sealed tube, the hard glass constituting the arc tube 12 is also thermally deformed. However, as described above, since the cylindrical body 24 made of a material having a higher melting point than the hard glass constituting the light-emitting tube 12 is inserted into the end portions 12 a and 12 b of the light-emitting tube 12, thermal deformation does not occur. The ends 12a and 12b of the arc tube 12 are blocked. The ends 12a and 12b of the light-emitting tube 12 are inserted into the tube.

Page 35 521299 V. Description of the invention (33) The inside of the hull portion 16 can also be prevented from being caused by the melting of the end portions 12a, 12b of the sealed tube 14 in the ends i2a, 12b. 'Although in the above, as A description will be given of the rigid glass having ultraviolet transmission characteristics constituting the light-emitting tube 12. For example, glass having ultraviolet transmission characteristics may be used as a material constituting the light-emitting tube 12. Fig. 24 is a schematic cross-sectional view showing a main part when the light-emitting tube 10 is used as a transmissive display light source. As shown in Fig. 10, the light-emitting tube 12 is arranged along one end surface of the light guide plate 35. One of the sealing portions 19 of the tube 14 and the sealing portion 16 formed from the hole 26 are deflected. The end surface is arranged, and the other sealing portion 18 and the tube body portion 16 where the hole 26 is formed protrude from the end of the light guide plate 35. However, the upper tube body portion 16 'on one end side of the arc tube 2 protrudingly arranged at the end of the plate 35 and the above-mentioned sealing portion M on the other end side and a driving circuit having a discharge tube 10 arranged in the tube space can reach the back. Miniaturization of the shape of the lamp. When a discharge occurs between the electric electrodes 20 applied to the discharge tube 10 through a pair of lead terminals 22, electrons collide with ultraviolet rays and emit ultraviolet rays of various wavelengths. The radiated ultraviolet rays pass through a phosphor which is emitted to the outside of the arc tube 12 and generate visible light. The light guide plate 35 diffuses and reflects, and forms light toward the transmissive display panel side of the guide plate. In the discharge tube described above, the two ends of the arc tube are inserted into the arc tube and the arc tube 12 is blocked. The glass is exemplified but is not limited to this. English glass and the like, that is, as shown in 24 of the backlight of the board, discharge, and after one end of the tube body on each side of the sealing portion 19 is orthogonal to the side of the sealing portion 18, From the light guide, the moving part 36 between the sealing part 18 and the body part 16 is pressurized, and the discharge gas radiates from the tube 12 to excite the visible light passing through the light plate 35 to form a light emission.

521299 V. Description of the invention (34) The cylindrical body made of a material with a high melting point of ultraviolet penetrating glass, and at least one of the constituent materials of Tongming light pipe and sealed tube have a higher melting point and is heated at a temperature lower than the melting point of the same body. Make the arc tube and the sealed tube at least double-re-solidified to perform the welding of the arc tube's end and the sealed tube. Therefore, even when the arc tube's end is melted or thermally deformed, the tube does not: Therefore, the end portion 防止 caused by the melting or thermal deformation of the light-emitting tube can be prevented, and the two ends of the light-emitting tube are respectively inserted into the tube body portion, so even if the sealed tube is melted or thermally deformed during welding, it can be prevented: ^ The sealed tube enters from the end of the lock to block the inside of the end. ί = Hetian uses a UV-transparent glass of the same material as the arc tube to form a seal. I 'uses a higher melting point than the UV-transmissive glass of the light tube and the sealed tube, and a temperature lower than the melting point of the above-mentioned object; 2 Attachment :. After melting both the arc tube and the sealed tube, since the two parts are respectively inserted into the tube body ㈣, they can be blocked during welding. In addition, the blockage in the end caused by the entry of ring 1 is caused by the insertion of the cylindrical body with a light-transmitting material, so that the cylindrical body does not block the light in the j :::, which can prevent the light-emitting tube from emitting area. Minus y hair "ultraviolet rays

Page 521299 Brief description of the drawings [Illustration of the drawings] Fig. 1 is an explanatory diagram showing a discharge tube and a backlight of the first embodiment of the present invention; Fig. 2 is an explanatory diagram showing a discharge tube manufacturing method of the first embodiment of the present invention; 3 is an explanatory view showing a discharge tube according to a second embodiment of the present invention; FIG. 4A is an explanatory view showing an example of using the discharge tube and the backlight of the second embodiment of the present invention; FIG. 5 is a sectional view of the backlight of the present invention; 6 is an explanatory diagram showing a method for manufacturing a discharge tube according to a second embodiment of the present invention; FIG. 7 is an explanatory diagram showing a method for manufacturing a discharge tube according to a second embodiment of the present invention;

Fig. 8 = An explanatory diagram showing a method for manufacturing a discharge tube according to a second embodiment of the present invention; Fig. 9 is a β representation _ An explanatory diagram for a method for manufacturing a discharge tube according to a second embodiment of the present invention; And FIG. 11 are explanatory diagrams of examples of use of the backlight; FIG. 11 is a view showing FIG. 12 is a material connecting pipe; FIG. 13 is a sectional view showing a structural sealing material; Description of the four embodiments of the case of the tube body and the four parts of the embodiment and the sealing of the tube are shown in the figure. The main part of the discharge tube is related to the discharge and discharge tube. The large cross-sectional view of the seal is used;

Fig. 14 I, Fig. 15 ^ are explanatory diagrams of a discharge tube according to a fifth embodiment of the present invention; Fig. 16 ^ is an explanatory diagram of a method for manufacturing a discharge tube according to a fifth embodiment of the present invention; An explanatory diagram of a method for manufacturing a tube; FIG. Shows an explanatory diagram of a method for manufacturing a discharge tube according to a fifth embodiment of the present invention; 疋 An explanatory diagram for a method of manufacturing a discharge tube according to a fifth embodiment of the present invention;

521299 Brief description of the drawing '~ ------ Fig. 19 is an explanatory diagram showing a fifth embodiment of the discharge tube manufacturing method of the present invention. Fig. 20 is an explanatory diagram showing a sixth embodiment of the discharge tube of the present invention. Fig. 21 is a view showing FIG. 22 is an explanatory diagram showing a method for manufacturing a discharge tube according to a sixth embodiment of the present invention; FIG. 22 is an explanatory diagram showing a method for manufacturing a discharge tube according to a sixth embodiment of the present invention; FIG. 2 4 FIG. 25 is an explanatory view showing a discharge tube and a backlight using example of the sixth embodiment of the present invention; FIG. 25 is an explanatory view showing a manufacturing method of a conventional discharge tube; FIG. 26 is a cross-sectional view of a conventional backlight; There are illustrations of discharge tubes. [Description of symbols] 10 discharge tube 11 luminous tube 14 sealing tube 1 4a tubular protrusion 16 tube body portion 18 first sealing portion 19 second sealing portion 19a second sealing portion outer periphery 20 discharge electrode 22 lead terminal 24 cylindrical body 26 Hole 28 closed container

521299

Brief description of drawings on page 40 32 Backlight 34 Sealing material 34a First sealing material 34b Second sealing material 34c Third sealing material 35 Light guide plate 40 Soft glass tube 41 Hard glass tube 48 Cutout 49 Mercury gas suction Agent 50 reflector

Claims (1)

521299 VI. Scope of patent application [Scope of patent application] 1 A light-emitting device, a series of light-emitting tubes composed of light-transmitting materials, and arranged at a direction orthogonal to the end of the tube, and sealed with discharge electrodes at the same time Connected sealed tube. The first seal formed by the sealed tube package outside the arc tube inside the arc tube 2 / The discharge tube diameter described in item 1 of the scope of patent application is smaller than that of the sealed tube. 3. If the discharge tube described in item 1 of the patent application is sealed with mercury vapor, a phosphor layer is formed on the tube surface. 4 · The discharge tube described in item 1 of the patent application includes a tube body portion, and the tube body portion is sealed. The third sealing portion after the opening is opened; wherein the outer edge of the second sealing portion is slightly flat, and the wide light emitting g is connected to the pipe body portion near the second sealing portion. A three-lamp lamp having at least a light guide plate and a discharge tube; wherein the p-type is connected to both ends of a light-emitting tube formed of a light-transmitting material, and a light-transmitting tube body portion is sealed with the tube. The sealing tubes of the first branch seal and the first branch seal formed by the openings at the two ends of the body are respectively connected to the airtight container formed in a slightly orthogonal state, and then the enemy gas is sealed in the airtight container. And a discharge tube formed by sealing a portion of a discharge electrode in a first sealing portion of each sealing tube; it is characterized in that at the ^ end portion of one end face of the light guide plate, it is divided into butt joints to the second of each sealing tube of the discharge tube The above-mentioned arc tube is also arranged outside the sealing portion, and along one end face of the light guide plate other than both end portions arranged to the outer edge of the second sealing portion. 6. —A kind of backlight, which is provided with at least a light guide plate and a discharge tube; the discharge tube is installed at both ends of a light-emitting tube formed of a light-transmitting material and is transparent. 321299 VI. Scope of patent application _ Qiu Qiu, made of materials, & _-sealing section, section: seal ::: the first connection formed by openings at both ends of the pipe body section, respectively The discharge gas is connected in a slightly orthogonal state, and the bifurcated container is sealed in the air-tight container. # 八 In the first sealing part of each sealed tube, the two ends of the discharge electricity are sealed to form a cut, and then: On the pilot plate-end face of the discharge tube, there is a tube body part protruding on the other end face forming a cut. The second part is dense. The cutout is arranged from the outer end of the light emitting tube 7 and the dense part. An electric tube basin and a second tube / tube on top of the seed tube are made of a light-transmitting material; at least one end of the tube is connected with an opening, and the upper portion is connected. The heart piece is sealed inside its base end, and the discharge described in item 7 of the patent scope of the front end is exposed in the arc tube at the same time, 1 to: use the melting point lower than the material constituting the arc tube and ii; the expansion coefficient; The coefficient of thermal expansion, and the sealing material of the thermal expansion of the sealing material of 4 values are sealed. ~ As in the discharge tube described in item 8 of the scope of the patent application, 1 is the ratio of the melting point of the light-emitting tube material; s = = expansion coefficient and sealing component coffee The expansion coefficient is increased in order. "Within the scope of the pieces, the 10 · -manufacturing methods of the discharge tube are attached to both ends of the light-emitting tube and connected to the seal. Page 42 6. Scope of patent application In the discharge electrode shape, at the same time, the discharge electrode phase is sealed with the tube inside the light-emitting tube. 11. One type of sealing tube is equipped with a suction tube inside the light-absorbing tube. 12 · —Hole with low material at both ends of the light pipe of the light emitting tube, the melting point of the light emitting material is high, the material is melted 13 · If the sealing material is applied, the light emitting tube is thermally expanded 14 · If it is applied to a plurality of light emitting tubes A pair of the sealing tube and the luminous tube are closely packed into at least one pair of parts, and are sealed and sealed. The connection between the electric tube and the outer diameter of the aerosol material is made into a vacuum electrical tube. The two ends of the sealing material tube are attached to the outside and the ratio is sealed. Then the patent range is used to expand the two ends of the patent range tube in the expansion coefficient. The material is low, and after sealing the tube, the sealing tube is pre-empty, and the method is closer than the above. The sealing method is to seal the melting point and then insert the tube and send it to cure. The outer edge of item 13 is a plurality of light-emitting tubes which are thermally expanded to form a connected shape and are arranged in a line. The light-emitting tubes are arranged with a getter material thereon, and then the sealed tube is removed and the above-mentioned getter material is arranged. In other words, the thin light-emitting tube connected to the pair of sealed tubes sealed in the discharge electrode is connected, and the tube is to be sealed, and then the sealed tube and the dense with the above-mentioned getter material are arranged. The sealing tube is sealed with a sealing material. The method of connecting the junction material is to first pass through the tube body portion formed on the sealing tube body portion after forming the back, sealing tube and luminous tube, and then use a temperature lower than the melting point of the sealing material light tube. The manufacturing method of the discharge tube described in the sealing 〇, wherein the coefficient is about the coefficient of thermal expansion of the sealed tube and the material. The method for manufacturing a discharge tube according to the method, wherein the sealing material is a thermal expansion coefficient of the sealing material of the sealing material forming the multilayer structure than the sealing coefficient of the sealed tube. Ιϋ ^ 521299 6. Between the scope of patent application, and, the side sealing material 15. A pipe body, and one of the sealed air-tight container sealed tube of the sealed portion and the sealed tube are placed in a cylindrical body, and then pass through the The internal body of the tube has a high melting point. After the tube and the tube are sealed, it is allowed to be melted. 1 · If both the sealed tube system light tube and the sealed heat-emitting tube are melted 1 7 · If the tube system is applied, the multiple seals The material's thermal expansion coefficient increases sequentially from the sealing material on the side of the arc tube to the external material. A method for manufacturing an electric tube, wherein at both ends of the light-emitting tube, a pair of dense tubes are formed after sealing the two ends of the tube body portion after melting to form a self-connecting connection to form an air-tight container. I generate a discharge gas for ultraviolet rays, and at the same time, a discharge electrode is arranged near each sealing portion, and a light-emitting welding connection is made by welding. After the two ends of the arc tube are inserted in the holes formed in the sealed tube body portion, the arc tube is heated at a temperature lower than the melting point of at least one of the arc tube and the sealed tube and lower than the melting point of the cylindrical body, and the light is emitted in the vicinity. At least one of the tube and the sealed tube is smelted == The discharge tube manufacturing method according to item 15, wherein the tube is made of a material, that is, produced with a temperature lower than the melting point of the cylindrical body, Λ The end and the sealing camp; a like 4 <. ^ / Dish exhibition, plus, then make two: near the hole, the discharge tube described in item 15 of the patent range of the light-emitting tube and the sealed tube is composed of a light-transmitting material By. "Method where Page 44