JP2008130342A - Low-pressure discharge lamp and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-pressure discharge lamp in which a problem is solved that, when a low-pressure discharge lamp provided with a backlight unit is required to be made larger, a sealing means at an end portion of a bulb, a component member, is required to be provided with a charge/discharge tube at the sealing end portion in order to charge/discharge inside the bulb under an ordinary pressure if a bead sealing is changed into a squeeze sealing in view of a cost reduction and as a result, an introduction wire has to be made thinner and the introduction wire becomes unable to support the discharging lamp and a crack is likely to develop at a bulb end portion if the sealing means is changed into the squeeze sealing, when a mouth piece is fixed on the bulb end portion for supporting the discharge lamp. <P>SOLUTION: The charge/discharge tube 31 necessitated when the squeeze sealing is introduced is extended from the sealing portion 32 and the extended part is wound by the introduction wires 25, 27, where the mouth piece is fixed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a low-pressure discharge lamp mainly used for a backlight of a liquid crystal display device or the like, and an illumination device including the lamp.

Conventionally, low pressure discharge lamps used for backlights of liquid crystal display devices and the like have been steadily reduced in size in order to meet the demand for downsizing liquid crystal display devices and the like.
In conventional small-sized low-pressure discharge lamps for backlights, so-called bead sealing is used in which the end of the bulb, which is a component of the lamp, is sealed using a cylindrical bead glass in the manufacturing process. The discharge lamp is supported on the casing of the lighting device by an introduction line extending from the bead-sealed end portion to the outside of the bulb, and the discharge lamp and the casing are electrically connected ( Patent Documents 1 and 2), electric power was supplied to the electrode in the discharge lamp through the lead-in wire to light the discharge lamp.

Also, a so-called bead-sealed end is provided with a bottomed cylindrical base (see Patent Documents 3, 4, and 5), and supported by the casing by the base and the casing-side electrical contact Some can be electrically connected to.
In recent years, among liquid crystal display devices, there has been a demand for enlargement of liquid crystal monitors for personal computers, liquid crystal television receivers, etc., and in response to this demand, the size and size of low-pressure discharge lamps for backlights have also been increased. There is a demand for a caliber.

  As described above, when bead sealing is adopted in the sealing process of a large-diameter valve in response to the demand for larger size, it is necessary to newly prepare a large-diameter bead glass, but the outer diameter is large. The bead glass with a small inner diameter is difficult to produce, and it becomes necessary to prepare bead glass with different dimensions as the valve diameter varies, leading to an increase in cost. We are considering adopting so-called crushing sealing instead of bead sealing.

The crushing sealing does not require the bead glass, and is convenient for sealing the large-diameter bulb.
JP 2005-183011 A JP 2005-294019 A Japanese Patent No. 3462306 Japanese Utility Model Publication No. 64-48851 Japanese Patent Laid-Open No. 07-262910

  However, when crushing sealing is adopted for a low pressure discharge lamp for a backlight, it is necessary to seal the supply / exhaust pipe for supplying / exhausting the inside of the bulb under normal pressure to the end of the bulb after crushing and sealing the lead-in line. Therefore, compared to the case of bead sealing, the portion where the lead-in line can be arranged becomes narrow, so it is necessary to make the lead-in line thin. When supported by the lead-in line, the lead-in line bends or breaks due to the load. The discharge lamp may not be supported.

  Therefore, in order to support the discharge lamp, when the bulb end is covered with a base, the discharge lamp is supported by the base and electrically connected to the electrical contact on the housing side, the bulb end is crushed in the crush sealing. When the end portion having a large processing strain is covered with a base when the lamp is turned on or turned off, the processing strain at the end portion is large between the base and the bulb end portion. A crack (crack) extends at the end due to the stress generated due to the temperature difference, and the discharge gas enclosed in the bulb inner space may leak from the crack extension, which may hinder lamp lighting. .

  The present invention has been made in view of the above-described problems, and provides a low-pressure discharge lamp that can be supported while suppressing a load on a bulb end and can be electrically connected, and an illumination device including the low-pressure discharge lamp. The purpose is to do.

In order to achieve the above object, in the low-pressure discharge lamp according to the present invention, a cylindrical bulb having both ends crushed is provided, and at least one of the crushed ends serves as a power supply path to the internal electrode. Wire and a supply / exhaust pipe whose outer end is sealed, and a base electrically connected to the lead-in line is attached to a valve portion other than the crushing end or the supply / exhaust pipe did.
In order to achieve the above object, the illumination device according to the present invention has a cylindrical bulb with both ends crushed, and at least one of the crushed ends functions as a power supply path to the internal electrode. A low-pressure discharge lamp through which an introduction line and a supply / exhaust pipe whose outer end is sealed are inserted, and are provided on the housing side and electrically connected to a portion of the introduction line outside the bulb An electrical contact was connected to a portion other than the crushing end portion of the valve or the supply / exhaust pipe.

In the low-pressure discharge lamp according to the present invention, the cap is attached to a portion of the bulb other than the crushing end portion or to the air supply / exhaust pipe. Can be supported while suppressing the load on the valve end.
If the low-pressure discharge lamp that exhibits the above effects is employed in the lighting device, it is possible to suppress the occurrence of troubles in lighting of the lamp, extend the lamp replacement cycle, and improve convenience.

  In the illuminating device according to the present invention, the electric contact is attached to the bulb portion other than the crushing end portion or to the air supply / exhaust pipe, so that a crushing portion having a larger processing distortion than the conventional beat sealing is avoided. The low-pressure discharge lamp can be supported while suppressing the load on the bulb end.

(Embodiment 1)
Hereinafter, the cold cathode fluorescent lamp and the backlight unit (illumination device) according to the present embodiment will be described with reference to the drawings.
1. Configuration of Direct-Type Backlight Unit FIG. 1 is a schematic perspective view showing the configuration of a direct-type backlight unit 5 according to the present embodiment. In the figure, a part of the front panel 16 is cut away so that the internal structure can be seen.

The direct-type backlight unit 5 has a plurality of cold-cathode fluorescent lamps 7 and a liquid crystal panel-side surface from which light is extracted, and a plurality of cold-cathode fluorescent lamps 7 (hereinafter simply referred to as “lamp 7”). And a front panel 16 that covers an opening of the housing.
The lamps 7 have a straight tube shape, and the 14 lamps 7 in a posture in which the longitudinal axis of the straight tube substantially coincides with the longitudinal direction (lateral direction) of the casing 9 are arranged in the short direction (vertical direction) of the casing 9. (Direction) are alternately arranged at predetermined intervals. The meaning of “alternately” will be described later.

These lamps 7 are turned on by a driving circuit (not shown).
The housing 9 is made of polyethylene terephthalate (PET) resin, and a reflective surface is formed on the inner surface 11 by depositing a metal such as silver. In addition, as a material of a housing | casing, you may comprise by materials other than resin, for example, metal materials, such as aluminum.
The opening of the housing 9 is covered with a translucent front panel 16 and is sealed so that foreign matters such as dust and dust do not enter inside. The front panel 16 is formed by laminating a diffusion plate 12, a diffusion sheet 13, and a lens sheet 14.

  The diffusion plate 12 and the diffusion sheet 13 scatter and diffuse the light emitted from the lamp 7, and the lens sheet 14 aligns the light in the normal direction of the sheet 14, and thereby the lamp 7 The light emitted from the front panel 16 is configured to irradiate the front uniformly over the entire surface (light emitting surface) of the front panel 16. In addition, as a material of the diffusion plate 12, a PC (polycarbonate) resin can be used.

FIG. 2 is a perspective view of the main part of the backlight unit 5. A socket 84 is provided in the bottom wall 11a of the housing 9 at a position corresponding to the peripheral region of the front panel 16, and the base 72 of the cold cathode fluorescent lamp 7 is fitted and electrically connected to the socket 84, respectively. It is held with this.
2. Configuration of Cold Cathode Fluorescent Lamp Next, the configuration of the cold cathode fluorescent lamp 7 according to the present embodiment will be described with reference to FIG. FIG. 3A is a partially cutaway view showing a schematic configuration of the cold cathode fluorescent lamp 7. FIG. 3B is a cross-sectional view of the electrodes 17 and 19.

  The lamp 7 has a glass bulb (glass container) 15 having a substantially circular cross section and a straight tube shape. The glass bulb 15 has, for example, an outer diameter of 6.0 [mm] and an inner diameter of 5.0 [mm], and the material thereof is soda glass, borosilicate glass, or the like. In this embodiment, soda glass is used. The dimensions of the lamp 7 described below are values corresponding to the dimensions of the glass bulb 15 having an outer diameter of 6.0 [mm] and an inner diameter of 5.0 [mm]. Needless to say, these values are merely examples, and the embodiment is not limited.

Mercury is sealed in the glass bulb 15 at a predetermined ratio with respect to the volume of the glass bulb 15, for example, 0.6 [mg / cc], and a rare gas such as argon or neon is sealed at a predetermined sealing pressure. , For example, 20 [Torr] (20 × 133.32 [Pa]). Note that argon gas is used as the rare gas.
A phosphor layer 21 is formed on the inner surface of the glass bulb 15. The phosphor layer 21 includes a red phosphor, a green phosphor, and a blue phosphor that convert ultraviolet rays emitted from mercury into red, green, and blue, respectively.

The phosphor layer 21 includes, for example, a blue phosphor with europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ] (abbreviation: BAM-B), and a green phosphor with cerium / terbium co-activated phosphorus. A lanthanum acid [LaPO ₄ : Ce ³⁺ , Tb ³⁺ ] (abbreviation: LAP) and a red phosphor are formed of a rare earth phosphor composed of europium activated yttrium oxide [Y ₂ O ₃ : Eu ³⁺ ] (abbreviation: YOX). Yes.

The phosphor layer 21 is not uniform in the longitudinal direction of the glass bulb 15, and is, for example, thicker from the first sealing portion side to the second sealing portion side. This will affect the light emission characteristics.
Further, at each end of the valve 15, the sealing portions 32 and 33 are formed by being crushed. Two lead wires 25 and 27 are led out from the sealing portions 32 and 33 of the glass bulb 15 to the outside.

The lead-in wires 25 and 27 are, for example, connecting lines composed of internal lead wires 25A (27A) made of dumet wires and external lead wires 25B (27B) made of nickel. The inner lead wire 25A (27A) has a wire diameter of 0.3 [mm] and a total length of 10 [mm], and the outer lead wire 25B (27B) has a wire diameter of 0.3 [mm] and a total length of 10 [mm]. It is.
Further, for example, one air supply / exhaust pipe 31 having an outer diameter of 2.4 [mm] and an inner diameter of 1.6 [mm] is sealed to the sealing portions 32 and 33.

A hollow electrode 17 (19) made of nickel (Ni) is fixed to the tip of the internal lead wire 25A (27A). This fixing is performed using, for example, laser welding.
The electrodes 17 and 19 have the same shape, and the dimensions shown in FIG. 3B are as follows: electrode length L1 = 12.5 [mm], outer diameter pO = 4.70 [mm], inner diameter pi = 4. 20 mm and wall thickness t = 0.10 [mm].

When the lamp 7 is turned on, discharge occurs between the cylindrical inner surface of the bottomed cylindrical electrode 17 and the cylindrical inner surface of the bottomed cylindrical electrode 19.
The shape of the electrodes 17 and 19 is not limited to this, and may be a rod shape or a plate shape. The number of lead-in wires 25 and 27 may be one in each of the sealing portions 32 and 33 of the valve 15, but if two are sealed, they become thinner than in the case of bead sealing. It is preferable that the electrodes 17 and 19 can be reliably supported by the lead-in wires 25 and 27, and when the axial positions of the electrodes 17 and 19 and the axial position of the valve 15 are matched at the time of manufacture, the positioning becomes easy.

The inner ends of each of the air supply / exhaust pipes 31 reach the inner space of the valve 15 and are located closer to the sealing portions 32 and 33 than the electrodes 17 and 19 attached to the leading ends of the introduction lines 25 and 27.
The outer end of each of the air supply / exhaust pipes 31 extends to a predetermined distance outside the sealing portions 32 and 33, for example, 8 [mm] from the outer ends of the sealing portions 32 and 33. Has been sealed.

In the above-described “sealing portions 32 and 33”, the valve 15 is not completely sealed, but the valve 15 is supplied from the air supply / exhaust pipe 31 sealed to the sealing portions 32 and 33 under normal pressure. After supplying and exhausting the inner space, the outer ends of the air supply / exhaust pipes 31 are sealed, and the valve 15 is completely sealed.
Introductory lines 25 and 27 drawn to the outside of the valve 15 are wound around the portions of the air supply / exhaust pipe 31 that extend to the outside of the sealing portions 32 and 33, respectively. A base 72 is fixed so as to cover the outlet part and the introduction lines 25 and 27 wound around them, and each of the introduction lines 25 and 27 is in close contact with each base 72 and each supply / exhaust pipe 31 extension part.

  Since each base 72 is fixed to each of the extending portions of the air supply / exhaust pipe 31 while maintaining contact with the introduction lines 25 and 27, the cold cathode fluorescent lamp is supported only by the introduction line and the electrical contacts on the housing side Compared with the case where they are electrically connected to each other, it is possible to support the cold cathode fluorescent lamp 7 while preventing the load to be disconnected from the lead-in wires 25 and 27 from being applied, and to support the cold-cathode fluorescent lamp 7 and the housing 9 side. The socket 84 (see FIG. 2) can be electrically connected.

In addition, by adopting this configuration, the cold cathode fluorescent lamp 7 is supported and the casing is restrained from applying a load to the end of the bulb 15 having a larger processing distortion than in the case of conventional bead sealing. The 9-side socket 84 can be electrically connected.
The base 72 has a sleeve shape, and has an inner diameter that is smaller than the outer diameter of the supply / exhaust pipe 31 that has been wound around the introduction wires 25 and 27 before being fixed, and is fitted and fixed by an elastic force. The fixing method of the base 72 is not limited to this, and a member whose inner diameter is larger than the outer diameter of the air supply / exhaust pipe 31 wound around the introduction wires 25 and 27 may be fixed with solder or a conductive adhesive before fixing. Further, the shape of the base 72 is not limited to the above, and may be a cap shape.

If a slit parallel to the axial direction of the sleeve is formed from one opening end to the other opening end in the sleeve-shaped base 72, it is preferable that it is easily fitted and fixed by elastic force.
In the present embodiment, the lead wires 25 and 27 are wound around the extending portion of the air supply / exhaust pipe 31 and the base 72 is fixed from above. However, the present invention is not limited to this, and the lead wires 25 and 27 are wound. Instead, the base 72 may be fixed to the extended portion of the air supply / exhaust pipe 31 while extending from the sealing portions 32 and 33 of the valve 15.

  When the lead wires 25 and 27 are wound around the extending portion of the air supply / exhaust pipe 31, the lead wires 25 are compared with the case where the base 72 is fixed from above the lead wires 25 and 27 that are not wound and stretched. , 27 and each base 72 can be securely connected, and particularly when a sleeve-shaped base 72 having a slit is used, the lead-in wires 25, 27 are missed by the base 72. This is preferable from the viewpoint of improving the yield.

Fixing the base 72 to the air supply / exhaust pipe 31 with solder or a conductive adhesive is preferable because the load on the air supply / exhaust pipe 31 can be reduced as compared with the case where the base 72 is fixed by fitting with an elastic force. Then, compared with the case where it adheres with solder, the thermal load to the air supply / exhaust pipe 31 can be reduced, and it is more preferable.
In the present embodiment, the cap 72 is fixed to each of the air supply / exhaust pipes 31 while being separated from the respective sealing portions 32 and 33 of the valve 15 and covering the introduction lines 25 and 27.

Specifically, one end of the base 72 on the sealing portion 32, 33 side of the valve 15 is separated from the sealing portion 32, 33 of the valve 15 by 0.5 [mm] or more, and the base 72 is fixed. .
In the portions of the air supply / exhaust pipe 31 that are attached to the sealing portions 32, 33 of the valve 15, processing distortion occurs when the sealing portions 32, 33 are formed. Since these are separate members, it is considered that there are a large number of microvoids at these joints. Therefore, when the base 72 is wound around the air supply / exhaust pipe 31 so as to be in contact with the sealing portions 32, 33, it is caused by a temperature difference generated between the base 72 and the air supply / exhaust pipe 31 when the lamp is turned on or off. A stress is generated in the joint portion, and a crack (crack) is likely to extend to the joint portion due to the generated stress, and the cold cathode fluorescent lamp 7 cannot be supported by the socket 84 of the housing 9. The discharge gas enclosed in the space may leak and hinder the lighting of the lamp.

  In the present embodiment, each base 72 is fixed in a state in which the end on the valve 15 side is separated from the sealing portions 32 and 33 of the valve 15, so that the generation of the stress can be suppressed. It is preferable because the crack (crack) extension at the joint portion can be suppressed, the cold cathode fluorescent lamp 7 can be supported by the socket 84 of the housing 9, and the discharge gas leakage as described above can be suppressed.

In the present embodiment, since the base 72 is formed in a sleeve shape, the base 72 is preferably attached without covering the tip outside the valve 15 of each of the air supply / exhaust pipes 31 as compared with the cap-shaped one.
As described above, the tip outside the valve 15 of each air supply / exhaust pipe 31 is sealed by being chipped off after being supplied and exhausted to the inner space of the valve 15, so that processing distortion also occurs at the tip. When the base 72 is attached to the tip where the processing distortion is generated, stress is generated at the tip due to a temperature difference between the base 72 and the supply / exhaust pipe 31 when the lamp is turned on or off. A crack (crack) is likely to extend at the tip due to the applied stress, and the discharge gas sealed in the bulb inner space may leak from the crack extension location, resulting in trouble in lamp lighting.

In the present embodiment, the sleeve-shaped base 72 is used and is fixed to the air supply / exhaust pipe 31 without being attached to the tip of the air supply / exhaust pipe 31 outside the valve 15. This is preferable because it is possible to suppress the crack (crack) extension at the joining portion and to suppress the discharge gas leakage as described above.
<< Effect of Cold Cathode Discharge Lamp 7 According to Embodiment 1 >>
As described above, in the present embodiment, since the base 72 is fixed to each of the extending portions of the air supply / exhaust pipe 31 while covering the introduction lines 25 and 27, the cold cathode fluorescent lamp is supported by the introduction line. Compared to the case where the electrical contacts on the housing side are electrically connected to each other, the cold cathode fluorescent lamp 7 is supported by suppressing the load on the lead-in wires 25 and 27 and the socket 84 on the housing 9 side. Can be electrically connected.

In addition, by adopting this configuration, the cap 72 can be fixed while avoiding the crushing sealing portions 32 and 33, so that the end of the valve 15 having a larger processing distortion than the conventional bead sealing. It is possible to support the cold cathode fluorescent lamp 7 while preventing the load from being applied to the portion, and to electrically connect this to the socket 72 on the housing 9 side.
Therefore, the cold cathode fluorescent lamp 7 according to the present embodiment can be supported while suppressing loads on the lead wires 25 and 27 and the end of the bulb 15 and can be electrically connected.

  Further, in the present embodiment, each base 72 is separated from the sealing portions 32 and 33 of the valve 15 and is fixed to each of the air supply / exhaust pipes 31 while covering the introduction lines 25 and 27. Generation of stress generated in the tube 31 can be suppressed, load on the supply / exhaust tube 31 can be suppressed, and electrical connection and support of the cold cathode lamp 7 can be further ensured.

In addition, in the present embodiment, the sleeve-shaped base 72 is used and is fixed to the supply / exhaust pipe 31 without covering the tip of the supply / exhaust pipe 31 outside the valve 15. Generation can be suppressed, the load on the supply / exhaust pipe 31 can be suppressed, and the electrical connection and support of the cold cathode fluorescent lamp 7 can be further ensured.
(Embodiment 2)
Since this embodiment is different from the first embodiment in that a hot cathode fluorescent lamp is used as a low-pressure discharge lamp, only the differences from the first embodiment will be described, and other configurations will be described here. Description is omitted.

FIG. 4 is an exploded view of a main part of the hot cathode discharge lamp 71 in the present embodiment. As shown in FIG. 4, the hot cathode fluorescent lamp 71 includes a straight tube-type tubular bulb 151 in which a discharge medium is sealed, and electrodes 171 and 191 are arranged near the end of the bulb 151.
In the present embodiment, the introduction lines 251 and 271 drawn out of the valve 151 are substantially linear with respect to the portions of the supply / exhaust pipe 311 that extend outside the sealing portions 321 and 331 of the valve 151. The caps are fixed so as to cover the supply / exhaust pipe 311 extending portion and the introduction lines 251 and 271, and the introduction lines 251 and 271 are in close contact with the base 721 and the supply / exhaust pipe 311.

  As shown in the partially enlarged view of FIG. 4, each of the caps 721 includes conductive portions 721 a and 721 b and an insulating portion 721 c and has a slit 721 d, and insulates the conductive portions 721 a and 721 b from each other in the sleeve-shaped base 721. The portion 721c and the slit 721d are electrically insulated. For example, the introduction line 251 is in close contact with the conductive portion 721 b of the base 721 and the supply / exhaust pipe 311, and the introduction line 271 is in close contact with the conductive portion 721 a of the base 721 and the supply / exhaust pipe 311. By adopting this configuration, when power is supplied from the socket 84 (see FIG. 2) on the housing 8 side at the time of starting the lamp, the electrode 171 (191) is configured without short-circuiting between the lead wires 251 and 271. The filament 231 to be energized can be energized to generate heat, and thereafter, the discharge between the electrodes 171 and 191 can be promoted. Even after the base 721 is fixed, the sleeve shape of the base 721 is maintained, that is, the base 721 has a slit 721d in the fixed state. When the base 721 adopts the configuration, the conductive portions 721a and 721b can maintain electrical insulation even after being fixed.

The base 721 is fixed using solder or a conductive adhesive. Fixing with the conductive adhesive is more preferable because the thermal load on the air supply / exhaust pipe 31 can be reduced as compared with the case of fixing with the solder.
When the base is fixed with solder or a conductive adhesive, a base formed by connecting the conductive portions 721a and 721b to each other with an electrically insulating member may be used. When the base is used, since there is no slit, the mechanical strength of the base can be improved as compared with the base 721 including the slit 721d.
<< Effect of Hot Cathode Discharge Lamp 71 in Embodiment 2 >>
In the present embodiment, a hot cathode fluorescent lamp 71 is employed as a low-pressure discharge lamp, which is different from the cold cathode tendency lamp 7 employed as the low-pressure discharge lamp in the first embodiment, but as in the first embodiment, Since each of the bases 721 is fixed to each of the extending portions of the air supply / exhaust pipe 311 while covering the introduction lines 251 and 271, it is possible to suppress the load from being applied to the introduction lines 251 and 271 and to prevent the conventional bead sealing. It is possible to support the hot cathode fluorescent lamp 71 and electrically connect the socket 84 on the housing 9 side by suppressing the load from being applied to the end of the bulb 151 having a larger processing distortion than in the case.

Therefore, the hot cathode fluorescent lamp 71 according to the present embodiment can be supported while suppressing the addition to the lead wires 251 and 271 and the end of the bulb 151 as in the first embodiment. It can be carried out.
Further, in the present embodiment, similarly to the first embodiment, each base 721 is separated from the sealing portions 321 and 331 of the valve 151, and is provided in each of the supply and exhaust pipes 311 while covering the introduction lines 251 and 271. Since it is fixed, the electrical connection and support of the hot cathode lamp 71 can be further ensured.

In addition, in the present embodiment, similarly to the first embodiment, the sleeve-shaped base 721 is used and is fixed to the supply / exhaust pipe 311 without covering the outer end of the supply / exhaust pipe 311. The electrical connection and support of the cathode fluorescent lamp 71 can be further ensured.
(Embodiment 3)
In the present embodiment, there is a great feature in the position of the base, which is a constituent member of the cold cathode fluorescent lamp, and the other configuration is substantially the same as the configuration in the first embodiment. Description of other configurations is omitted here.

FIG. 5 is a partially exploded view of the cold cathode fluorescent lamp 73 in the present embodiment. As shown in FIG. 5, in the cold cathode fluorescent lamp 73, the tip of the supply / exhaust pipe 312 outside the valve 152 is shorter from the sealing portions 322 and 332 of the valve 152 than in the first embodiment. As in the first mode, the chip is off and sealed.
In the present embodiment, the lead-in wires 252 and 272 drawn to the outside of the valve 152 are bent, and the body portion of the valve 152, specifically, the sealing portions 322 and 332 of the valve 152 and the vicinity thereof are avoided. The base 722 is fixed while being in contact with the introduction lines 252 and 272 at a position covering the electrodes 172 and 192 included in the valve 152, and the introduction lines 252 and 272 are in close contact with the valve 152 and the base 722 at the position. Yes.

  Since the base 722 is fixed to the portion of the bulb 152 that covers the electrodes 172 and 192 while avoiding the sealing portions 322 and 332 of the bulb 152 while maintaining contact with the lead-in wires 252 and 272, the cold-cathode fluorescent lamp is formed by the lead-in wire. Compared to the case of supporting and electrically connecting this to the electrical contacts on the housing side, the cold cathode fluorescent lamp 73 is supported while suppressing the load that breaks the lead wires 252 and 272 from being applied. In addition, the lead wires 252 and 272 and the socket 84 on the housing 9 side can be electrically connected.

In addition, by adopting this configuration, the cold cathode fluorescent lamp 73 is supported and the casing is restrained by applying a load to the end of the bulb 152 that has a larger processing distortion than in the case of conventional bead sealing. The 9-side socket 84 can be electrically connected.
By adopting this configuration, the longitudinal length of the air supply / exhaust pipe 312 can be reduced compared to the first embodiment, and the proportion of the cold cathode fluorescent lamp 73 that does not emit light can be reduced. Can be preferred.

Each of the caps 722 is fixed to a portion of the valve 152 that covers the electrodes 172 and 192. Since the gap between the electrodes 172 and 192 and the inner surface of the valve 152 is extremely small in the portion of the valve 152, a cylindrical shape is formed. Even if the phosphor film 212 is formed on the inner surface of the bulb 152 facing the outer walls of the electrodes 172 and 192, no light is emitted.
If the base 722 and the lead-in wires 252 and 272 are arranged on the inner side of the bulb 152 than the ends of the electrodes 172 and 192 on the inner side of the bulb 152, the lamp 73 emits light. The cap 722 and the lead-in wires 252 and 272 are preferably arranged on the outer side of the valve 152 than the inner ends of the electrodes 152 and 192.

The base 722 has a sleeve shape, and has an inner diameter that is smaller than the sum of the diameters of the lead-in wires 252 and 272 and the outer diameter of the valve 152 before being fixed, and is fitted and fixed by elastic force. The fixing method of the base 722 is not limited to this, and may be fixed with solder or a conductive adhesive.
In the present embodiment, the lead wires 252 and 272 are sandwiched between the caps 722 and the portions of the valve 152 covering the electrodes 172 and 192 so that the axial direction thereof is the same as the axial direction of the valve 152. The lead wires 252 and 272 may be wound around the portion of the valve 152 that covers the electrodes 172 and 192, and may be sandwiched between the portion of the valve 152 and each base 722.

  When each of the lead wires 252 and 272 is sandwiched between the portion of the valve 152 and each of the caps 722, the electrical connection with the cap 722 is ensured as compared with the case where the lead wires 252 and 272 are stretched. In particular, since the base 722 has a sleeve shape with slits, it is possible to prevent the lead wires 252 and 272 from being pinched by the base 722, which is preferable from the viewpoint of improving the yield.

When the base 722 is fixed to the valve 152 with solder or a conductive adhesive, the load on the valve 152 can be reduced as compared with the case where the base 722 is fixed with an elastic force. When the base 722 is fixed with a conductive adhesive, it is fixed with solder. Compared to the case, the thermal load on the valve 152 can be reduced, which is more preferable.
<< Effect of Cold Cathode Discharge Lamp 73 in Embodiment 3 >>
As described above, in the present embodiment, the base 722 is fixed to the portion of the valve 152 that covers the electrodes 172 and 192 while avoiding the sealing portions 322 and 332 of the valve 152 while keeping contact with the lead-in wires 252 and 272. Therefore, compared to the case where the cold cathode fluorescent lamp is supported by the lead-in and the electrical contact on the housing side is electrically connected, a load that breaks the lead-in wires 252 and 272 is added. The cold cathode fluorescent lamp 73 can be suppressed and the lead-in wires 252 and 272 can be electrically connected to the socket 84 on the housing 9 side.

In addition, by adopting this configuration, the cold cathode fluorescent lamp 73 is supported and the casing is restrained by applying a load to the end of the bulb 152 that has a larger processing distortion than in the case of conventional bead sealing. The 9-side socket 84 can be electrically connected.
Therefore, the cold cathode fluorescent lamp 73 according to the present embodiment can be supported while suppressing loads on the lead wires 252 and 272 and the ends of the bulb 152, and can be electrically connected.

By adopting this configuration, the longitudinal length of the air supply / exhaust pipe 312 can be reduced compared to the first embodiment, and the proportion of the cold cathode fluorescent lamp 73 that does not emit light can be reduced. Can be preferred.
(Embodiment 4)
Since this embodiment is different from the third embodiment in that a hot cathode fluorescent lamp is used as a low-pressure discharge lamp, only the differences from the third embodiment will be described, and other configurations will be described here. Description is omitted.

FIG. 6 is an exploded view of a main part of the hot cathode fluorescent lamp 74 in the present embodiment. As shown in FIG. 6, the hot cathode fluorescent lamp 74 has a discharge tube sealed in a straight tubular bulb 153 and electrodes 173 and 193 arranged near the end of the bulb 153.
In the present embodiment, the lead-in wires 253 and 273 drawn to the outside of the valve 153 are bent to avoid the sealing portions 323 and 333 of the valve 153 and the vicinity thereof, specifically, the body of the valve 153, specifically, the valve At the position covering the electrodes 172 and 192 included in 153, the base 723 is fixed while being in contact with the introduction lines 253 and 273, and the introduction lines 253 and 273 are in close contact with the base 723 and the valve 153.

The electrodes 173 and 193 include a glass stem 292 that supports the introduction wires 253 and 273 in the internal space of the bulb 153 and a filament 233 that connects the inner ends of the introduction wires 253 and 273, respectively. In the bulb 153 body, it is preferably fixed at a position covering the stem 292 constituting the electrodes 173 and 193.
This is because the gap between the filament 233 and the inner surface of the bulb 153 is wider than that in the third embodiment, and if the phosphor film 213 is formed on the inner surface of the bulb 153 facing the electrodes 173 and 193, it contributes to light emission. It is.

  Electrons that contribute to light emission are generated between the filaments 233 of the electrodes 173 and 193. Since the gap between the filament 233 and the inner surface of the bulb 153 is wider than that in the third embodiment, the light emission contributing electrons enter the gap. There is a high possibility of doing. Therefore, the outer ends of the valve 153 of the base 723 and the lead-in wires 253 and 273 are disposed as close to the end of the valve 153 (sealing portions 323 and 333) as possible as long as they can be securely fixed to the valve 153. preferable.

In the present embodiment, the preferable disposition position of the base 723 is set as described above. However, the limit of the area where the phosphor film 213 is not formed in the bulb 153 can be securely fixed. It is most preferable to fix the base 723 in that region.
As shown in the partial enlarged view of FIG. 6, each of the caps 723 includes conductive portions 723 a and 723 b and an insulating portion 723 c and has a slit 723 d, and the conductive portions 723 a and 723 b are insulated from each other in the sleeve-shaped base 723. The portion 723c and the slit 723d are electrically insulated. For example, the introduction line 253 is in close contact with the conductive portion 723b of the base 723 and the valve 153, and the introduction line 273 is in close contact with the conductive portion 723a of the base 723 and the valve 153. By adopting this configuration, when power is supplied from the socket 84 on the housing 9 side at the time of starting the lamp, the filament 233 constituting the electrode 172 (192) is not short-circuited between the lead-in wires 253 and 273. It can be energized to generate heat, and thereafter, discharge between the electrodes 172 and 192 can be promoted. Even after the base 723 is fixed, the sleeve shape of the base 723 is maintained, that is, the base 723 has a slit 723d in the fixed state. When the base 723 employs this configuration, the conductive portions 723a and 723b can maintain electrical insulation even after being fixed.

As a method for fixing the base 723, solder or a conductive adhesive is used. Fixing with a conductive adhesive is more preferable because the thermal load on the valve 153 can be reduced as compared with fixing with a solder.
<< Effect of Hot Cathode Fluorescent Lamp 74 in Embodiment 4 >>
In the present embodiment, a hot cathode fluorescent lamp 74 is employed as a low pressure discharge lamp, which is different from the cold cathode tendency lamp 73 employed as the low pressure discharge lamp in the third embodiment, but as in the third embodiment, Each of the caps 723 is in contact with the lead-in wires 253 and 273, avoiding the sealing portions 323 and 333 of the valve 153 and the vicinity thereof, and in the body portion of the valve 153, specifically, the electrodes 173 and 173 included in the valve 153. Since it is fixed at a position covering 193, it is possible to suppress a load from being applied to the lead-in wires 253 and 273, and a load is applied to the end of the valve 153 which has a larger processing distortion than in the case of conventional bead sealing. Thus, the hot cathode fluorescent lamp 74 can be supported and electrically connected to the socket 84 on the housing 9 side.

Therefore, the hot cathode fluorescent lamp 74 according to the present embodiment can be supported while suppressing the load on the lead wires 253 and 273 and the end of the bulb 153 as in the third embodiment, and the electrical connection is achieved. It can be carried out.
(Embodiment 5)
In the present embodiment, the base is removed from the components of the cold cathode fluorescent lamp, and the lead wire drawn out of the bulb to directly supply power to the electrode contained in the bulb is directly connected to the electrical contact on the backlight unit side. There is a feature in that it is brought into contact with a certain socket, and the other configuration is substantially the same as the configuration of the first embodiment. Therefore, only the characteristic portion is referred to, and the description of the other portion is omitted here.

FIG. 7 is a perspective view of a main part of the backlight unit 105 according to the present embodiment, in which optical sheets are omitted so that the inside can be seen. As shown in FIG. 7, a socket 184 is provided at a position corresponding to the peripheral region of the optical sheets in the bottom wall 111 a of the housing 109 that is a member of the backlight unit 105.
The lead wires 254 and 274 extending from the sealing portions 324 and 334 at the end of the bulb 115, which is a member of the cold cathode fluorescent lamp 107, are wound around the supply and exhaust pipe 314 that is similarly extended, The extended portion of the exhaust pipe 314 that has been wound around the lead wires 254 and 274 is fitted into the socket 184 so that the cold cathode fluorescent lamp 107 is electrically connected to the housing 109 and held therein.

Each of the sockets 184 is set to have the same polarity, and the two lead wires 254 and 274 extending from each end of each valve 115 can be set to the same polarity.
In the backlight unit 105, each of the sockets 184 is fitted to each of the extending portions of the air supply / exhaust pipe 314 while maintaining contact with the introduction lines 254, 274, so that the cold cathode fluorescent lamp is supported by the introduction line and Compared to the case where this is electrically connected to the electrical contacts on the housing side, the cold cathode fluorescent lamp 107 is supported by the socket 184 while suppressing the load that breaks the lead wires 254 and 274 from being applied. In addition, the socket 184 can be electrically connected to the lead-in wires 254 and 274.

In addition, by adopting this configuration, the cold cathode fluorescent lamp 107 is supported by the socket 184 while preventing a load from being applied to the end of the bulb 115, which has a larger processing distortion than in the case of conventional bead sealing. 184 can be electrically connected.
In the present embodiment, the extended portion of the supply / exhaust pipe 314 wound around the introduction lines 254, 274 and the socket 184 of the housing 109 are fitted, but the present invention is not limited thereto, and the introduction lines 254, 274 are connected to each other. You may make it fit with the socket 184, extending from the sealing parts 324,334 of the valve | bulb 115. FIG. In that case, when an insulating double-sided tape having a width smaller than the length in the longitudinal direction of the socket 184 is wound around the air supply / exhaust pipe 314, the lead wires 254 and 274 are temporarily fixed thereto, and then inserted into the socket 184. 254 and 274 can be securely inserted into the socket 184, which is preferable.

  When the lead-in wires 254 and 274 are wound around the supply / exhaust pipe 314 extension, the lead-in wires 254 and 274 that are stretched without being wound and the supply / exhaust pipe 314 are simultaneously fitted in the socket 184. Thus, the electrical connection with the socket 184 can be ensured. Particularly, since the socket 184 has a sleeve shape, the lead-in wires 254 and 274 can be prevented from being missed, which is preferable from the viewpoint of improving the yield.

  In this embodiment, a pressing force is applied to the socket 184, and the socket 184 and the supply / exhaust pipe 314 extension portion that has been wound around the lead-in wires 254 and 274 are fastened by this pressing force. When the fastening is performed with the adhesive, the load on the air supply / exhaust pipe 314 can be reduced as compared with the case where the fastening is performed with the pressing force. The fastening with the conductive adhesive is preferable as compared with the case where the fastening is performed with the solder. Therefore, it is more preferable that the thermal load on the supply / exhaust pipe 314 can be reduced.

In the present embodiment, the socket 184 is separated from the sealing portions 324 and 334 of the valve 115, and the inner surface thereof is fitted with each of the air supply / exhaust pipes 314 while being in contact with the introduction wires 254 and 274.
Specifically, one end of the socket 115 on the side of the sealing portion 324, 334 of the valve 115 is separated from the sealing portion 324, 334 of the valve 115 by 0.5 [mm] or more, and the socket 184 is connected to the air supply / exhaust pipe 314. It is mated with.

  In the portion of the air supply / exhaust pipe 314 covered with the sealing portions 324, 334 of the valve 115, processing distortion occurs when the sealing portions 324, 334 are formed, and the supply / exhaust pipe 314 and the valve 115 are originally different from each other. Since it is a member, it is considered that there are a large number of minute voids at these joints. Therefore, when the socket 184 is fitted to the air supply / exhaust pipe 314 so as to be in contact with the sealing portions 324, 334, it is caused by a temperature difference generated between the socket 184 and the air supply / exhaust pipe 314 when the lamp is turned on or off. As a result, stress is generated at the joint, and cracks are likely to extend at the joint due to the generated stress, and the discharge gas enclosed in the bulb space leaks from the crack and interferes with lamp lighting. May occur.

In the present embodiment, since the socket 184 is separated from the sealing portions 324 and 334 of the valve 115, the generation of the stress can be suppressed, and the crack (crack) extension at the joint portion can be suppressed. This is preferable because the discharge gas leakage as described above can be suppressed.
In the present embodiment, since the socket 184 is formed in a sleeve shape, the socket 184 is preferably attached without covering the outer end of the valve 115 of each of the air supply / exhaust pipes 314 as compared with the cap shape.

  As described above, the outer end of each of the air supply / exhaust pipes 314 is sealed by being chipped off after being supplied / exhausted to the inner space of the valve 115, so that processing distortion also occurs at the tip end. When a cap-shaped socket is attached to the tip where the lamp is generated, stress is generated at the tip due to a temperature difference between the socket 184 and the supply / exhaust pipe 314 when the lamp is lit or extinguished. A crack (crack) is likely to extend at the tip due to the applied stress, and the discharge gas sealed in the bulb inner space may leak from the crack extension location, resulting in trouble in lamp lighting.

In the present embodiment, a sleeve-shaped socket 184 is used and is fitted to the air supply / exhaust pipe 314 without covering the tip of the valve 115 outside the air supply / exhaust pipe 314, so that the generation of the stress is suppressed. It is possible to suppress the crack extension at the joint, and to suppress the discharge gas leakage as described above, which is preferable.
<< Effect of Backlight Unit 105 in Embodiment 5 >>
As described above, in this embodiment, since the socket 184 is fitted to each of the supply / exhaust pipe 314 extending portions while being in contact with the introduction lines 254, 274, the cold cathode fluorescent lamp is supported by the introduction line. Compared with the case where this is electrically connected to the electrical contact on the housing side, the cold cathode fluorescent lamp 107 is supported by suppressing the load on the lead-in wires 254, 274 and the socket of the housing 109. 184 can be electrically connected.

In addition, by adopting this configuration, the cold cathode fluorescent lamp 107 is supported by supporting the cold cathode fluorescent lamp 107 while preventing the load from being applied to the end of the bulb 115 having a larger processing distortion than in the case of conventional bead sealing. 109 sockets 184 can be electrically connected.
Therefore, in the backlight unit 105 according to the present embodiment, it is possible to perform electrical connection and support to the cold cathode fluorescent lamp 107 while suppressing the load on the lead wires 254 and 274 and the end of the bulb 115.

  Further, in the present embodiment, the socket 184 of the housing 109 is separated from the sealing portions 324 and 334 of the valve 115 and is fitted to each of the air supply and exhaust pipes 314 while being in contact with the introduction lines 254 and 274. Therefore, the generation of stress in the air supply / exhaust pipe 314 can be suppressed, the load on the air supply / exhaust pipe 314 can be suppressed, and electrical connection and support to the cold cathode lamp 107 can be further ensured. be able to.

In addition, in the present embodiment, the sleeve-shaped socket 184 is used and is fitted to the air supply / exhaust pipe 314 without covering the tip of the air supply / exhaust pipe 314 outside the valve 115. The generation of stress can be suppressed, the load on the supply / exhaust pipe 314 can be suppressed, and the electrical connection and support to the cold cathode fluorescent lamp 107 can be further ensured.
(Embodiment 6)
The present embodiment is different from the fifth embodiment only in that a hot cathode fluorescent lamp is used as the fluorescent lamp, and therefore, the description of the other parts common to the fifth embodiment is omitted here.

FIG. 8 is a perspective view of a main part of the backlight unit 205 in the present embodiment, in which optical sheets are omitted so that the inside can be seen.
In the present embodiment, the hot cathode fluorescent lamp 207 is used, and the introduction lines 255 and 275 extending from the sealing portions 325 and 335 at the end of the bulb 154 that is the member are similarly extended. The extended portion of the air supply / exhaust pipe 315 that is along the air supply / exhaust pipe 315 and parallel to the introduction lines 255 and 275 is fitted into the socket 284 so that the hot cathode fluorescent lamp 207 is electrically connected to the housing 209. And is held by this.

In that case, when an insulating double-sided tape having a width smaller than the length in the longitudinal direction of the socket 284 is wound around the air supply / exhaust pipe 315 and the lead wires 255 and 275 are temporarily fixed thereto, the lead wire is inserted into the socket 284. The lead-in wires 255 and 275 can be surely inserted into the socket 284 by preventing the 255 and 275 from being dropped, which is preferable from the viewpoint of improving the yield.
In the present embodiment, each of the sockets 284 has a two-piece structure, and two lead wires 255 and 275 extending from each end of the bulb 154 and an electrode filament (included in the bulb 154) ( (Not shown) can form a current path. The configuration of the socket 284 is not limited to this, and may be a physically integrated structure that is electrically insulated so as to form the above-described current path.

  And in this Embodiment, in the part which supports the introductory lines 255,275 and the supply / exhaust pipe 315 among each piece of the socket 284, the cross section perpendicular to the axis of the supply / exhaust pipe 315 has a bent shape. That is, in the support portion of each piece of the socket 284, the inner walls facing the introduction lines 255 and 275 and the air supply / exhaust pipe 315 are in a valley fold state, and the introduction lines 255 and 275 along the surface of the air supply / exhaust pipe 315 are provided. It fits in the inner wall of this valley fold. In the present embodiment, the introduction lines 255 and 275 are provided in the socket 284 in comparison with the arcuate cross section perpendicular to the axis of the air supply / exhaust pipe 315 in the support portion of each piece constituting the socket 284 in this embodiment. It can suppress that a short circuit arises between pieces by fitting between each piece which comprises.

  Since each of the sockets 284 is fitted with each of the supply / exhaust pipes 315 extending while keeping contact with the lead-in wires 255 and 275, the cold-cathode fluorescent lamp is supported by the lead-in wire and the housing side electric Compared with the case where the contacts are electrically connected, the hot cathode fluorescent lamp 207 is supported by the socket 284 while preventing the load that breaks the lead wires 255 and 275 from being applied, and the socket 284 is connected to the lead wire. 255 and 275 can be electrically connected.

Moreover, by adopting this configuration, the hot cathode fluorescent lamp 207 is supported by the socket 284 while suppressing the load from being applied to the end of the bulb 154 which has a larger processing distortion than in the case of conventional bead sealing, and the socket 284 can be electrically connected.
In this embodiment, a pressing force is applied to the socket 284, and the socket 284, the lead-in wires 255, 275, and the supply / exhaust pipe 315 extending portion are fastened by this pressing force. When the fastening is performed, it is possible to reduce the load on the air supply / exhaust pipe 315 as compared with the case where the fastening is performed with the pressing force. When fastening with the conductive adhesive, the supply / exhaust is performed as compared with the case where the fastening is performed with the solder. It is more preferable because the thermal load on the tube 315 can be reduced.
<< Effect of Backlight Unit 205 in Embodiment 6 >>
As described above, in the present embodiment, since the socket 284 is fitted to each of the supply / exhaust pipe 315 extending parts while being in contact with the introduction lines 255 and 275, the hot cathode fluorescent lamp is supported by the introduction line. Compared with the case where this is electrically connected to the electrical contact on the housing side, the hot cathode fluorescent lamp 207 is supported by suppressing the load on the lead-in wires 255 and 275 and the socket of the housing 209 is supported. 284 can be electrically connected.

In addition, by adopting this configuration, it is possible to support the hot cathode fluorescent lamp 207 and prevent the load from being applied to the end of the bulb 154 which has a larger processing distortion than in the case of conventional bead sealing. 209 socket 284 can be electrically connected.
Therefore, in the backlight unit 205 according to the present embodiment, it is possible to suppress the load on the lead wires 255 and 275 and the end of the bulb 154 and to electrically connect and support the hot cathode fluorescent lamp 207.

  Also in this embodiment, as in the fifth embodiment, the socket 284 of the housing 209 is separated from the sealing portions 325 and 335 of the valve 154 and the supply / exhaust pipe 315 is in contact with the introduction lines 255 and 275. Since they are engaged with each other, it is possible to suppress the generation of stress in the supply / exhaust pipe 315, to suppress the load on the supply / exhaust pipe 315, and to connect the hot cathode lamp 207 and Support can be further ensured.

  In addition, in the present embodiment, as in the fifth embodiment, the sleeve-shaped socket 284 is used and is fitted to the air supply / exhaust pipe 315 without covering the tip of the valve 154 outside the air supply / exhaust pipe 315. The generation of stress in the supply / exhaust pipe 315 can be suppressed, the load on the supply / exhaust pipe 315 can be suppressed, and the electrical connection and support to the hot cathode fluorescent lamp 207 can be further ensured. Can do.

<Alternating lamp arrangement>
FIG. 9 is a schematic diagram showing a region where a phosphor film is formed in a glass bulb. Hereinafter, the formation region of the phosphor film in the discharge lamp shown in each of the above embodiments will be described in detail with reference to FIG.
In FIG. 9, in order to explain the formation region of the phosphor film, the other constituent members shown in the above embodiments, for example, the base 72 (721, 722), the air supply / exhaust pipe 31 (311, 312, 313, 314). , 315), and lead-in lines 25 and 27 are omitted.

  As shown in FIG. 9, the boundary portion (phosphor layer 21 (211, 212, 213) and non-existing region on the first sealing portion side of the glass bulb 15 (115, 151, 152, 153, 154) The distance from the boundary 36 to the first sealing portion 32 (321, 322, 323, 324, 325) side end (the length of the phosphor layer non-existing region) a1 and the boundary 36 When the distance a2 to the second sealing portion 33 (331, 332, 333) side end is compared, a2 is longer than a1 (a2> a1).

The dimensions are as follows, for example.
a1 = 8.0 [mm], a2 = 10.0 [mm].
The reason why the sizes of a1 and a2 are made different as described above will be described below.
As described above, the phosphor film is formed on the inner surface of the glass bulb of the fluorescent lamp. In the longitudinal direction of the glass bulb, the thickness of the phosphor film is not uniform. Since the fluorescent lamp used for the backlight has an elongated outer shape, the thickness of the phosphor film is particularly likely to be uneven.

In other words, in the longitudinal direction of the glass bulb, the phosphor film has a relationship such that one side is thicker and the other side is thinner. Such a difference in film thickness appears as a luminance difference at the time of lighting, and may cause luminance unevenness.
For this reason, in a direct-type backlight unit, luminance unevenness is suppressed by housing the fluorescent lamps in the casing in a state where the longitudinal directions are alternately arranged between adjacent fluorescent lamps.

  Here, “alternately” means that the first sealing portion 32 (321, 322, 323, 324, 325) and the second sealing portion are arranged between the adjacent lamps 7 (71, 73, 74, 107, 207). 33 (331, 332, 333) is in the opposite direction. 1 and 9 and FIG. 12 to be described later, the first sealing portion 32 (321, 322, 323, 324, 325) and the second sealing portion 33 (331, 332, 333) of the lamp 7 are provided. They are distinguished from “1” and “2” by numbers in squares.

In the conventional method of manufacturing a backlight unit, an operator visually confirms the identification marks (lot numbers, etc.) provided only on one side of the lamp one by one, identifies the orientation in the longitudinal direction, and Is arranged.
However, in the conventional method using the identification mark, there is a problem in that a process and equipment for attaching the identification mark are required, resulting in high cost.

Further, it is difficult to say that the conventional method of identifying the longitudinal direction is suitable for work automation.
Therefore, in the manufacturing method of the direct type backlight unit, there is no need for a process or equipment for attaching an identification mark, and it is possible to automatically identify the longitudinal direction of the fluorescent lamp by a simple method. Therefore, the sizes of the a1 and a2 are made different.

  That is, since the fluorescent lamp 7 (71, 73, 74, 107, 207) has a2 larger than a1 as described above, it detects using a sensor whether one of a2 or a1 is within a predetermined range. Or by detecting the distance between a2 and a1 using a sensor and obtaining the difference between them, the lamp 7 (71, 73, 74, 107, 207) (glass bulb 15 (115, 151, 152, 153, 154)) in the longitudinal direction can be identified. A process and equipment for attaching the identification mark are not required, and the manufacturing cost can be reduced.

Further, since the phosphor film 21 (211, 212, 213) is formed on the entire circumference of the glass bulb 15 (115, 151, 152, 153, 154), the glass bulb 15 (115, 151, 152, 153) is formed. 154) can be detected from one direction regardless of the rotating direction (rotation direction), and the sensing equipment configuration can be simplified.
Furthermore, since the distance between the boundary between the non-existing area of the phosphor layer and the existing area and the components of the lamp, such as electrodes and leads, is used for detection, the components that the lamp generally has can be effectively used for orientation identification. Can be used.
<Method for Manufacturing Cold Cathode Fluorescent Lamp>
Next, among the manufacturing method of the fluorescent lamp 7 (71, 73, 74, 107, 207) having the above-described configuration, processes relating to the formation of the phosphor layer and the formation of both sealing portions will be described in detail. In the following description, the electrode of a cold cathode fluorescent lamp is described as an example, but it goes without saying that the manufacturing method can be applied to a hot cathode fluorescent lamp as well.

10 and 11 are diagrams showing a manufacturing process of the cold cathode fluorescent lamp 20.
First, the prepared straight tubular glass tube 46 is suspended and immersed in the phosphor suspension in the tank. By making the inside of the glass tube 46 have a negative pressure, the phosphor suspension in the tank is sucked up and applied to the inner surface of the glass tube 46 [step A]. This siphoning is set so that the liquid level becomes a predetermined height of the glass tube by detecting the liquid level with the optical sensor 45. The liquid level error at this time is relatively large because of the influence of the viscosity of the phosphor suspension, the surface tension of the liquid level, and the like, and an error of about ± 0.5 mm occurs.

Next, after the phosphor suspension applied in the glass tube 46 is dried, a brush 47 is inserted into the inner surface of the glass tube 46 to remove unnecessary portions on the end of the glass tube 46 in the phosphor film 214. Remove [Step B].
Thereafter, after inserting the electrode 174 and the air supply / exhaust pipe 316 into the glass tube 46 on which the phosphor film 214 is formed, one end of the glass tube 46 (with the air permeability in the tube axis direction of the air supply / exhaust pipe 316 maintained ( The second sealing portion side) is heated by the burner 48 to be crushed and sealed [Step C].

The error from the set value of the sealing position is about 0.5 [mm].
Next, after the electrode 194 and the air supply / exhaust pipe 316 are inserted into the glass tube 46 from the opening end on the opposite side, the other end is crushed and sealed, and then the air supply / exhaust pipe 316 whose air permeability is maintained in the tube axis direction. The end of the first sealing portion side is air-tightly chipped off [Step D].
Further, the error from the set value of the sealing position is about 0.5 [mm] as in the opposite side.

The insertion position of the electrode 174 in the process C and the insertion position of the electrode 194 in the process D are adjusted so that the lengths of the regions where the phosphor film 214 is absent extending from both ends of the glass tube 46 after sealing are different. Is done. The electrode 194 on the first sealing portion side is inserted deeper into the position overlapping the phosphor film 214 than the electrode 174 on the second sealing portion side.
Subsequently, a portion near the end of the air supply / exhaust pipe 316 (second sealing portion side) in which air permeability is maintained is heated by the burner 52 to form a constricted portion, and then the mercury pellet 54 is It introduces into the supply / exhaust pipe 316 [process E]. The mercury pellet 54 is a titanium-tantalum-iron sintered body impregnated with mercury.

  In the subsequent process F, the glass tube 46 is exhausted and the glass tube 46 is filled with a rare gas. Specifically, a head of an air supply / exhaust device (not shown) is attached to the end of the glass tube 46 on the mercury pellet 54 side, and first, the inside of the glass tube 46 is evacuated and evacuated. The whole is heated from the outer periphery. The heating temperature in this case is about 380 [° C.] on the outer peripheral surface of the glass tube 46. As a result, the impure gas in the glass tube 46 including the impure gas entering the phosphor film 214 is discharged. After the heating is stopped, a predetermined amount of rare gas is filled.

When the rare gas is filled, the end portion on the mercury pellet 54 side of the air supply / exhaust pipe 316 on the second sealing portion side is heated and sealed by the burner 56 [step G].
Subsequently, in a process H shown in FIG. 11, the mercury pellet 54 is induction-heated by a high-frequency oscillation coil (not shown) arranged around the glass tube 46 to expel mercury from the sintered body (mercury extraction process). Thereafter, the glass tube 46 is heated in the heating furnace 57 to move the expelled mercury toward the electrode 194 on the first sealing portion side.

Next, the air supply / exhaust pipe 316 is heated by the burner 58 so as to leave a necessary length on the side of the electrodes 174 and 194 with respect to the constricted portion formed in the step E, and the chip is turned off and hermetically sealed [step I , J]. Similarly, the error from the set value of the sealing position is about 0.5 [mm].
<Manufacturing method of backlight unit>
Next, in the manufacturing process of the backlight unit, a process particularly related to detection of the lamp direction will be described with reference to FIG.

FIG. 12A is a diagram schematically illustrating the lamp feeder 60. FIG. 12B is a diagram showing a lamp direction adjusting process. FIG. 12C is a diagram showing a process of installing the lamp in the housing 9.
The lamp feeder 60 is a device that supplies the lamps 7 (71, 73, 74, 107, 207) one by one to the pedestal 66.

The pedestal 66 has a groove 66a for installing the lamp 7 (71, 73, 74, 107, 207), and has a mechanism for rotating the pedestal 360 [°].
A lamp 7 (71, 73, 74, 107, 207) is installed in the groove 66a, and above the positions corresponding to both ends of the lamp 7 (71, 73, 74, 107, 207). Sensors 64a and 64b are arranged. This sensor may be arranged only at one end of the lamp.

The sensors 64a and 64b are image sensors which are a kind of optical sensors, for example, and detect the direction of the lamp by detecting a2 and a1.
The lamps are aligned by rotating the pedestal 66 in accordance with the longitudinal direction of the lamps detected by the sensors 64a and 64b.
The lamps 7 (71, 73, 74, 107, 207) faced to each other are connected to the introduction lines 25 (251, 252, 253, 254, 255), 27 (271, 272, 273, 274, 275) or these introduction lines. The base 72 (721, 722, 723) electrically connected to the head is gripped by a gripping member (not shown), and the longitudinal direction is opposite between the adjacent lamps 7 (71, 73, 74, 107, 207). It will be inserted into the socket 67 (see FIG. 12C).

As shown in FIG. 12C, a pair of sockets 67 is disposed on the reflecting plate 311 a of the housing 309 at a position corresponding to the mounting position of the lamp 7. In FIG. 12C, the cold cathode fluorescent lamp 7 is illustrated, but the present invention can be similarly applied to other cold cathode fluorescent lamps and hot cathode fluorescent lamps except for the third and fourth embodiments. .
The socket 67 is conductive and is formed by bending a plate material such as stainless steel or phosphor bronze. Each socket 67 includes clamping plates 67a and 67b, a coupling piece 67c that couples the clamping plates 67a and 67b at the lower edge, and a connection plate 67d that protrudes from the coupling piece 67c.

The sandwiching plates 67 a and 67 b are provided with a recess that matches the outer diameter of the lamp 7.
The connection plate 67d extends from the connecting piece 67c in the outer direction of the housing 309, then obliquely extends to a predetermined height, and extends in the outer direction of the housing 309 again. For example, a V-shaped recess corresponding to the outer diameter of the base 72 is formed at the free end of the connection plate 67d.
By fitting the end of the lamp 7 into the recesses of the holding pieces 67a and 67b, the lamp 7 is held by the socket 67 by the plate spring action of the holding plates 67a and 67b. At the same time, by fitting the base 72 into the recess at the free end of the connection plate 67d, the base 72 is physically connected to the connection plate 67d and electrically connected by the plate spring action of the recess.
<Modification>
(Modification 1)
In order to further improve the accuracy of direction alignment, the glass bulb 15 (115, 151, 152, 153, 154) has an outer peripheral position outside the region where the phosphor film 21 (211, 212, 213) is formed. It is conceivable to adopt a configuration in which a mark for identification relating to the longitudinal direction is printed. Hereinafter, it demonstrates as the modification 1 which concerns on embodiment.

FIG. 13 shows a glass bulb 15a on which an identification mark is printed. FIG.13 (b) is sectional drawing in CC line of Fig.13 (a).
Three identification marks 70a, 70b, and 70c are formed on the outer periphery of the end of the glass bulb 15a.
The positions of the marks 70a, 70b, and 70c in the longitudinal direction of the glass bulb 15a are substantially equal to each other.

In addition, it is more preferable to form the marks 70a, 70b, and 70c on the outer periphery of the end portion on the second sealing portion side where the phosphor layer absence region is longer than on the first sealing portion side.
The marks 70a to 70c are formed by screen printing, for example. Note that gravure printing or inkjet printing may be used instead of screen printing.
By using such a glass bulb 15a on which identification marks 70a to 70c are formed, for example, by detecting the distance from the boundary portion 34 to the marks 70a to 70c, it is possible to identify the orientation in the longitudinal direction. .

  Further, the central portions (main portions) of the marks 70a to 70c are located at a regular interval of approximately 120 degrees from the central point O of the bulb when the cross section of the glass bulb 15a is viewed. As described above, the marks 70a to 70c are in a positional relationship in which the measurement target portion of the mark can be seen regardless of the rotation direction (rotation direction) of the glass bulb 15a. It is possible to detect either of these.

Note that characters may be printed as the marks 70a to 70c. The printing direction of the characters may be the longitudinal direction of the glass bulb 15a or the circumferential direction of the glass bulb. Moreover, you may print a lot number as a character.
(Modification 2)
Further, a part of the phosphor film on the inner periphery (inner surface) of the glass bulb may be left, and the remaining part may be used as a longitudinal direction identification mark. Hereinafter, it demonstrates as the modification 2 which concerns on embodiment.

As shown in FIG. 14, the phosphor film 22 is formed separately from the phosphor film 21b on the second sealing portion 33b side of the glass bulb 15b. Since the phosphor film 22 is located in a region outside the discharge region between the electrodes 17 and 19, it is a phosphor film that does not substantially contribute to light emission.
In this modification, for example, the distance a3 between the boundary 36b and the phosphor film 22 can be used for detection. In addition, since the identification mark is a phosphor film, light emission by irradiation with ultraviolet rays can be used for detection, and a sensor with a simple configuration can be used.

(Modification 3)
Even if the identification mark is not separately attached to the glass bulb, it is possible to identify the orientation in the longitudinal direction by devising the constituent members originally provided in the lamp. Hereinafter, it demonstrates as the modification 3 which concerns on embodiment.
FIG. 15 is a schematic diagram showing a schematic configuration of a glass bulb according to Modification 3. In FIGS. 15 (a) and 15 (b), glass bulbs 15c and 15d and phosphor layers 21c and 21d are shown in cross section, and an introduction line is shown. Reference numerals 25c, 27c, 251d, and 271d and electrodes 17c and 17d indicate the appearance. Further, in FIG. 15C, the electrode 17e is also shown in a cross section so that the shape can be seen. In FIG. 15, the description of the same components as those in FIGS.

In the example of FIG. 15A, a mark 75 for use in direction identification is provided in the circumferential direction at the lower center of the cylindrical electrode 17c (in the drawing, the hatched lines indicate coloring).
In this case, the distance e between the boundary 34c and the ring-shaped mark 75 can be used for detection. The marking on the electrode 17c is less likely to disappear than the marking on the outer periphery of the glass bulb, and the color can be made clear, so that the sensor accuracy can be improved.

  The example of FIG. 15B shows an application example to a hot cathode fluorescent lamp, and the glass stem 291d that supports the internal lead wires 251dA and 271dA connected to the filament 231d is colored. In this example, the distance f between the boundary 34 and the glass stem 291d can be used for detection. The glass stem 291d can be confirmed from any direction regardless of the rotation direction of the glass bulb 15d, and the sensing equipment configuration can be simplified.

In the example of FIG. 15C, a mark 76 is attached in the rotating direction of the base 72e. In this example, the distance g between the boundary 34e and the mark 76 can be used for detection. As with the mark 75, the mark 76 can be confirmed from any direction regardless of the rotation direction of the glass bulb 15e.
The shape of the electrode 17e is a bottomed cylindrical shape, but is not limited to this, and may be a cylindrical shape with both ends open or a rod shape.
6). Other matters (1) Difference in length of phosphor layer absence region As described in the above embodiment, in the manufacturing process of the lamp 7, the detection error of the liquid level of the phosphor suspension in the glass tube Is a maximum of ± 0.5 mm, and an error in sealing the first and second sealing portions is expected to be about 0.5 mm at the maximum.

Further, if an image sensor having 2 million pixels is used as the sensor, one pixel can be set to 0.1 mm, so that measurement accuracy in units of 0.1 mm can be realized.
Considering these circumstances, if the difference in the length of the phosphor layer absence region is at least 2 mm between the one end side and the other end side of the glass bulb, the direction of the longitudinal direction is surely used by using the sensor. Can be identified.
(2) Protective layer In this embodiment, a fluorescent lamp that does not have a protective layer (protective film) for the purpose of preventing mercury consumption on the inner surface of the glass bulb has been described. The present invention can also be applied to a fluorescent lamp.

Specifically, the length of the glass bulb is changed by using a sensor to detect the difference between the protective layer absence region extending from one end of the glass bulb and the protective layer absence region extending from the other end. The direction of the direction can be identified. That is, as long as it is a layered substance formed on the inner surface of the glass bulb, not only the phosphor layer but also a protective layer can be used.
(3) Glass bulb In each of the above embodiments, soda glass is used for the glass bulb, but not limited thereto, lead glass, lead-free glass, or the like may be used. In this case, the dark startability can be improved. That is, the glass as described above contains a lot of alkali metal oxides typified by sodium oxide (Na ₂ O). For example, in the case of sodium oxide, the sodium (Na) component elutes on the inner surface of the glass bulb over time. To do. This is because sodium has a low electronegativity, and sodium eluted at the inner end of the glass bulb (without a protective film) is considered to contribute to the improvement of the dark startability.

The alkali metal oxide content in the glass bulb material is preferably 3 mol% or more and 20 mol% or less.
For example, when the alkali metal oxide is sodium oxide, the content is preferably 5 mol% or more and 20 mol% or less. If it is less than 5 mol%, the probability that the dark start time will exceed 1 second increases (in other words, if it is 5 mol% or more, the probability that the dark start time will be within 1 second increases), and if it exceeds 20 mol%, the probability increases. This is because the use of time causes problems such as blackening (browning) or whitening of the glass bulb, resulting in a decrease in luminance, and a reduction in strength of the glass bulb.

In consideration of protection of the natural environment, it is preferable to use lead-free glass. However, lead-free glass may contain lead as an impurity in the manufacturing process. Therefore, glass containing lead at an impurity level of 0.1 wt% or less is also defined as lead-free glass.
Hereinafter, the additive of the valve | bulb comprised with soda glass, borosilicate glass, lead glass, lead-free glass, etc. is demonstrated.

By adjusting the thermal expansion coefficient of the glass, the sealing strength with a sealing member such as a lead wire of a cold cathode fluorescent lamp can be increased. For example, when the sealing member is made of tungsten (W), it is preferably set to 36 × 10 ⁻⁷ [K ⁻¹ ] to 45 × 10 ⁻⁷ [K ⁻¹ ]. In this case, the thermal expansion coefficient of glass can be made into said range by making the sum total of the alkali metal component and alkaline-earth metal component in glass into 4 [mol%]-10 [mol%].

In the case where the sealing member is made of Kovar or molybdenum (Mo), the sealing member is preferably 45 × 10 ⁻⁷ [K ⁻¹ ] to 56 × 10 ⁻⁷ [K ⁻¹ ]. In this case, the thermal expansion coefficient of glass can be made into said range by making the sum total of the alkali metal component and alkaline-earth metal component in glass into 7 [mol%]-14 [mol%].
Further, when the sealing member is made of Dumet, it is preferably in the vicinity of 94 × 10 ⁻⁷ [K ⁻¹ ]. In this case, the thermal expansion coefficient of glass can be made into said range by making the sum total of the alkali-metal component and alkaline-earth metal component in glass into 20 [mol%]-30 [mol%].

Further, it is possible to absorb ultraviolet rays of 254 [nm] or 313 [nm] by doping a glass with a predetermined amount of a transition metal oxide depending on its kind. Specifically, for example, in the case of titanium oxide (TiO ₂ ), the composition ratio of 0.05 [mol%] or more is doped to absorb ultraviolet rays of 254 [nm], and the composition ratio is 2 [mol%] or more. Thus, it is possible to absorb ultraviolet rays of 313 [nm]. However, when titanium oxide is doped more than the composition ratio of 5.0 [mol%], the glass is devitrified, so the composition ratio is 0.05 [mol%] or more and 5.0 [mol%] or less. It is preferable to dope in the range.

In the case of cerium oxide (CeO ₂ ), 254 [nm] ultraviolet rays can be absorbed by doping at a composition ratio of 0.05 [mol%] or more. However, when cerium oxide is doped more than 0.5 [mol%], the glass is colored, so cerium oxide has a composition ratio of 0.05 [mol%] to 0.5 [mol%]. It is preferable to dope in the following range. In addition, since coloring of glass by cerium oxide can be suppressed by doping tin oxide (SnO) in addition to cerium oxide, cerium oxide can be doped to a composition ratio of 5.0 [mol%] or less. . In this case, if cerium oxide is doped with a composition ratio of 0.5 [mol%] or more, ultraviolet rays of 313 [nm] can be absorbed. However, even in this case, when the composition ratio of cerium oxide is more than 5.0 [mol%], the glass is devitrified.

In the case of zinc oxide (ZnO), ultraviolet rays of 254 [nm] can be absorbed by doping at a composition ratio of 2.0 [mol%] or more. However, when zinc oxide is doped more than 10 [mol%], the thermal expansion coefficient of the glass increases, and when the sealing member is made of tungsten (W), the thermal expansion coefficient of the sealing member (about 44 × 10 ⁻⁷ [K ⁻¹ ]) and the glass have a coefficient of thermal expansion, which makes sealing difficult. Therefore, zinc oxide is contained in the range of 2.0 [mol%] to 10 [mol%]. It is preferable to dope. However, when the sealing member is made of Koval or molybdenum (Mo), the thermal expansion coefficient (about 51 × 10 ⁻⁷ [K ⁻¹ ]) of the sealing member is larger than that of tungsten. Therefore, zinc oxide can be doped to a composition ratio of 14 [mol%] or less. Further, when zinc oxide is doped more than 20 [mol%], the glass may be devitrified, so that zinc oxide is in the range of 2.0 [mol%] to 20 [mol%]. It is preferable to dope.

Further, in the case of iron oxide (Fe ₂ O ₃ ), 254 [nm] ultraviolet rays can be absorbed by doping at a composition ratio of 0.01 [mol%] or more. However, when iron oxide is doped more than the composition ratio of 2.0 [mol%], the glass is colored, so the iron oxide is contained in the composition ratio of 0.01 [mol%] to 2.0 [mol%]. It is preferable to dope in the following range.

  The infrared transmittance coefficient indicating the water content in the glass is preferably adjusted to be in the range of 0.3 to 1.2, particularly 0.4 to 0.8. When the infrared transmittance coefficient is 1.2 or less, it becomes easy to obtain a low dielectric loss tangent applicable to a high voltage application lamp such as an external electrode fluorescent lamp (EEFL) or a long cold cathode fluorescent lamp, and 0.8 or less. If so, the dielectric loss tangent becomes sufficiently small and can be applied to a high voltage application lamp.

The infrared transmittance coefficient (X) can be expressed by the following formula.
[Formula 1] X = (log (a / b)) / t
a: Transmittance [%] of a minimum point in the vicinity of 3840 [cm ⁻¹ ]
b: Transmittance [%] of a minimum point in the vicinity of 3560 [cm ⁻¹ ].
t: Thickness of glass The configuration of the phosphor layer 21 is not limited to the above configuration.
(1) UV absorption For example, in recent years, with the increase in size of liquid crystal color televisions, polycarbonate having good dimensional stability has been used for the diffusion plate that closes the opening of the backlight unit. This polycarbonate is easily deteriorated by ultraviolet rays having a wavelength of 313 (nm) emitted from mercury. In such a case, a phosphor that absorbs ultraviolet rays having a wavelength of 313 (nm) may be used. Examples of phosphors that absorb ultraviolet rays of 313 (nm) include the following.
(A) Blue europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _{y Mg 2-z Mn z Al} 16 O 27]
Here, x, y, and z are preferably numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0 ≦ z <0.1, respectively.

Examples of such phosphors include europium activated barium magnesium aluminate [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: BAM-B), and europium attached. There are active barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ ] (abbreviation: SBAM-B), and the like.
(B) Green • Manganese inactive magnesium gallate [MgGa ₂ O ₄ : Mn ²⁺ ] (abbreviation: MGM)
Manganese activated cerium aluminate, magnesium, zinc [Ce (Mg, Zn) Al ₁₁ O ₁₉ : Mn ²⁺ ] (abbreviation: CMZ)
Terbium-activated cerium aluminate / magnesium [CeMgAl ₁₁ O ₁₉ : Tb ³⁺ ] (abbreviation: CAT)
Europium / manganese co-activated barium aluminate / strontium / magnesium [Ba _1-xy Sr _x Eu _y Mg _1-z Mn _z Al ₁₀ O ₁₇ ] or [Ba _1-xy Sr _x Eu _y Mg _{2 -z} Mn _z Al ₁₆ O _27]
Here, x, y and z are numbers satisfying the conditions of 0 ≦ x ≦ 0.4, 0.07 ≦ y ≦ 0.25, and 0.1 ≦ z ≦ 0.6, respectively, and z is 0.4 It is preferable that ≦ z ≦ 0.5.

Examples of such phosphors include europium / manganese co-activated barium aluminate / magnesium [BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation) : BAM-G), europium / manganese co-activated barium aluminate / strontium / magnesium [(Ba, Sr) Mg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ , Mn ²⁺ ], [(Ba, Sr) MgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ ] (abbreviation: SBAM-G).
(C) Red • Europium activated phosphorus • Yttrium vanadate [Y (P, V) O ₄ : Eu ³⁺ ] (abbreviation: YPV)
Europium activated yttrium vanadate [YVO ₄ : Eu ³⁺ ] (abbreviation: YVO)
Europium-activated yttrium oxysulfide [Y ₂ O ₂ S: Eu ³⁺ ] (abbreviation: YOS)
Manganese-activated magnesium fluoride germanate [3.5MgO.0.5MgF ₂ .GeO ₂ : Mn ⁴⁺ ] (abbreviation: MFG)
Dysprosium-activated yttrium vanadate [YVO ₄ : Dy ³⁺ ] (red and green two-component phosphor, abbreviation: YDS)
In addition, you may mix and use the fluorescent substance of a different compound with respect to one type of luminescent color. For example, only BAM-B (absorbs 313 nm) in blue, LAP (does not absorb 313 nm) and BAM-G (absorbs 313 nm) in green, YOX (does not absorb 313 nm) and YVO in red. A phosphor (absorbing 313 nm) may be used. In such a case, as described above, the phosphor that absorbs the wavelength 313 (nm) is adjusted so that the total weight composition ratio is larger than 50%, so that the ultraviolet ray almost leaks out of the glass tube. Can be prevented. Therefore, when the phosphor layer 105 includes a phosphor that absorbs ultraviolet rays of 313 [nm], deterioration due to ultraviolet rays such as a diffusion plate made of polycarbonate (PC) that closes the opening of the backlight unit is suppressed, The characteristics as a backlight unit can be maintained for a long time.

  Here, “absorbing ultraviolet rays of 313 (nm)” means an excitation wavelength spectrum near 254 (nm) (excitation wavelength spectrum means that excitation light is emitted while changing the wavelength of the phosphor, and the excitation wavelength and emission intensity are changed. It is defined that the intensity of the excitation wavelength spectrum of 313 (nm) is 80 (%) or more, where the intensity is plotted (100). That is, the phosphor that absorbs ultraviolet rays of 313 (nm) is a phosphor that can absorb ultraviolet rays of 313 (nm) and convert it into visible light.

(2) High color reproduction Liquid crystal display devices typified by liquid crystal color televisions have been used as a light source for a backlight unit of the liquid crystal display device in accordance with the recent high color reproduction that has been made as part of higher image quality. There is a need to expand the reproducible chromaticity range in cathode fluorescent lamps and hot cathode fluorescent lamps.

  In response to such a request, for example, by using the following phosphor, the chromaticity range can be expanded as compared with the case of using the phosphor in the embodiment. Specifically, in the CIE 1931 chromaticity diagram, the chromaticity coordinate value of the phosphor for high color reproduction includes a triangle formed by connecting the chromaticity coordinate values of the three phosphors used in the embodiment. Located at the coordinates that expand the reproduction range.

(A) Blue • Europium activated strontium chloroapatite [Sr ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SCA), chromaticity coordinates: x = 0.151, y = 0.065
In addition to the above, europium-activated strontium, calcium, barium, chloroapatite [(Sr, Ca, Ba) ₁₀ (PO ₄ ) ₆ Cl ₂ : Eu ²⁺ ] (abbreviation: SBCA) can also be used, and the wavelength 313 (nm) SBAM-B, which can absorb the ultraviolet rays, can also be used for high color reproduction.

(B) Green BAM-G, chromaticity coordinates: x = 0.139, y = 0.574
CMZ, chromaticity coordinates: x = 0.164, y = 0.722
CAT, chromaticity coordinates: x = 0.267, y = 0.663
As described above, these can also absorb ultraviolet rays having a wavelength of 313 (nm), and besides the three phosphor particles described here, MGM can also be used for high color reproduction.

(C) Red • YOS, chromaticity coordinates: x = 0.651, y = 0.344
YPV, chromaticity coordinates: x = 0.658, y = 0.333
MFG, chromaticity coordinates: x = 0.711, y = 0.287
As described above, these can also absorb ultraviolet rays having a wavelength of 313 (nm). Besides the three phosphor particles described here, YVO and YDS can also be used for high color reproduction.

  In addition, the chromaticity coordinate values shown above are representative values measured only with each phosphor powder, and due to the measurement method (measurement principle), etc., the chromaticity coordinates indicated by each phosphor powder The value may be slightly different from the value listed above. For reference, the chromaticity coordinate values of the phosphor powders of the first embodiment are YOX (x = 0.644, y = 0.353), LAP (x = 0.351, y = 0.585). , BAM-B (x = 0.148, y = 0,056).

Furthermore, the phosphor used for emitting each color of red, green, and blue is not limited to one type for each wavelength, and a plurality of types may be used in combination.
Here, the case where a phosphor layer is formed using the above-described phosphor particles for high color reproduction will be described. In this evaluation, there are three evaluations in the case of using a phosphor for high color reproduction based on the area of the NTSC triangle (NTSC triangle) connecting the chromaticity coordinate values of the three primary colors of the NTSC standard in the CIE1931 chromaticity diagram. This is performed by the ratio of the area of the triangle that can connect the chromaticity coordinate values (hereinafter referred to as NTSC ratio).

  For example, when BAM-B is used as blue, BAM-G as green, and YVO as red (Example 1), the NTSC ratio is 92%, and SCA is used as blue, BAM-G as green, and YVO as red. (Example 2) NTSC ratio is 100%, and when SCA is used as blue, BAM-G as green, and YOX as red (Example 3), NTSC ratio is 95 (%). The luminance can be improved by 10 (%) compared to the above.

  The chromaticity coordinate values used for the evaluation here are measured in a state where a liquid crystal display device incorporating a lamp or the like is used.

  According to the present invention, it is possible to meet the demand for an increase in the size of a backlight of a liquid crystal display device and the like, and it is possible to reduce the number of connection points between individual low-pressure discharge lamps and a socket on the housing side, thereby improving productivity. And its industrial applicability is very wide and large.

1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 1. FIG. 3 is a perspective view of main parts of the backlight unit according to Embodiment 1. FIG. FIG. 3 is an exploded view of a main part of the cold cathode fluorescent lamp in the first embodiment. FIG. 4 is an exploded view of a main part of a hot cathode fluorescent lamp in a second embodiment. FIG. 10 is an exploded view of a main part of a cold cathode fluorescent lamp in a third embodiment. FIG. 6 is an exploded view of a main part of a hot cathode fluorescent lamp in a fourth embodiment. FIG. 10 is a perspective view of main parts of a backlight unit in a fifth embodiment. 14 is a perspective view of main parts of a backlight unit according to Embodiment 6. FIG. It is a schematic diagram which shows the area | region in which the fluorescent substance film was formed in the glass bulb. It is a schematic process drawing which shows the manufacturing process of a cold cathode fluorescent lamp. It is a schematic process drawing which shows the manufacturing process of a cold cathode fluorescent lamp. (A) is a schematic diagram which shows a lamp feeder, (b) is a schematic process drawing which shows the direction alignment process of a lamp, (c) is a schematic process which shows the installation process in the housing | casing of a lamp | ramp. FIG. (A) is a principal part schematic diagram which shows the glass bulb on which the identification mark in the modification 1 was printed, (b) is a schematic sectional drawing which shows the cross section in CC line of (a). . 10 is a schematic diagram illustrating a glass bulb according to Modification 2. FIG. It is a schematic diagram which shows schematic structure of the glass bulb | bulb which concerns on the modification 3.

Explanation of symbols

5, 105, 205 Backlight unit 7, 73, 107 Cold cathode fluorescent lamp 9, 109, 209 Housing 11, 111, 112 Inner surface 11a Bottom wall 12 Diffusion plate 13 Diffusion sheet 14 Lens sheet 16 Front panel 15, 15a, 15b , 15c, 15d,
15e, 115, 151, 152, 153, 154 Valves 17, 17a, 19, 171, 172
173, 174, 191, 192, 193, 194 Electrodes 21, 22, 21c, 21d, 21e, 211, 212, 213, 214 Phosphor films 25, 25a, 25c, 25d, 25e, 27, 27c,
27d, 27e, 251, 271, 252, 272, 253
273, 254, 274, 255, 275, 256, 276 lead wires 25A, 27A, 25cA, 251dA,
25eA, 27cA, 271dA, 27eA Internal lead wires 25B, 27B, 25cB, 251dB,
25eB, 27cB, 271dB, 27eB External lead wires 31, 311, 312, 313, 314, 315, 316 Supply / exhaust pipes 32, 33, 321, 322, 331, 332
323, 333, 324, 334, 325, 326 Sealing part 34, 36 Boundary part 37, 38 Electrode unit 45 Optical sensor 46 Glass tube 47 Brush 48, 50, 56, 58 Burner 54 Mercury pellet 57 Heating furnace 60 Lamp feeder 64a, 64b Sensor 66 Base 66a Groove 67 Socket 67a, 67b Holding plate 67c Connection piece 67d Connection plate 70a, 70b, 70c, 75, 76 Mark 71, 74, 207 Hot cathode fluorescent lamp 72, 721, 722 Base 721a, 721b, 723a, 723b Conductive portion 721c, 723c Insulating portion 67, 84, 184, 284 Socket 231, 233 Filament 291, 292 Stem

Claims (11)

It has a cylindrical valve with both ends crushed,
At least one of the crushing end portions is inserted with an introduction line functioning as a power supply path to the internal electrode, and an air supply / exhaust pipe sealed at the outer end portion,
A base electrically connected to the lead-in wire is a low-pressure discharge lamp attached to a portion of the bulb other than the crushing end or the supply / exhaust pipe.   The low-pressure discharge lamp according to claim 1, wherein the base has a sleeve shape, and is attached to an uncollapsed portion of the bulb other than the collapsed end portion.   2. The low-pressure discharge lamp according to claim 1, wherein the air supply / exhaust pipe extends from the crushing end portion toward the outside of the bulb, and the base is attached to the extension portion.   The tip outside the valve of the air supply / exhaust pipe is chipped off, and the base is sleeve-shaped, and is attached to the other part of the extending portion while avoiding the tip that is tipped off. The low-pressure discharge lamp according to claim 3.   The low-pressure discharge lamp according to claim 3 or 4, wherein the base is attached in a state in which a bulb side end is separated from the crushing end portion.   The illuminating device provided with the low pressure discharge lamp in any one of Claim 1 to 5. Both ends have a cylindrical valve that is crushed, and at least one of the crushed ends has an introduction line that functions as a power supply path to the internal electrode, and an air supply / exhaust pipe sealed at the outer end Is equipped with a low-pressure discharge lamp,
An illuminating device, wherein an electrical contact provided on a housing side and electrically connected to a portion outside the valve of the lead-in wire is connected to a portion other than the crushing end portion of the bulb or the supply / exhaust pipe.   The lighting device according to claim 7, wherein the electrical contact has a sleeve shape and is connected to an uncollapsed portion of the bulb other than the collapsed end portion.   The lighting device according to claim 7, wherein the supply / exhaust pipe extends from the crushing end portion toward the outside of the valve, and the electrical contact is connected to the extension portion.   A tip outside the valve of the air supply / exhaust pipe is tip-off, and the electrical contact is in a sleeve shape, and is connected to a portion other than the tip that is tip-off in the extending portion. The lighting device according to claim 9.   The lighting device according to claim 9 or 10, wherein the electric contact is connected in a state in which a valve side end is separated from the crushing end portion.

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