JP2011023166A - Fluorescent lamp, lighting device, manufacturing method for lighting device, and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp with an about C-shaped or U-shaped form in which discrimination of one end from the other end is easy without applying marking. <P>SOLUTION: In the fluorescent lamp 100 having a bulb 102 with the about C-shaped or U-shaped form, wherein a phosphor layer 101 is formed on an inner surface, electrodes 103, 104 arranged inside both ends of the bulb 102, lead wires 105, 106 wherein one end is connected with the electrode and the other end is led outside the bulb, and feeding terminals 107, 108 connected to the lead wires 105, 106, one feeding terminal 107 can be discriminated from the other feeding terminal 108 when viewing from an about vertical direction to a plane including a tube axis of the bulb 102. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp, an illumination device, a method for manufacturing the illumination device, and an image display device.

  A perspective view of a conventional lighting device is shown in FIG. A conventional illumination device (hereinafter referred to as “illumination device 1”) is, for example, a direct-type backlight unit, and a plurality of U-shaped fluorescent lamps 2 are disposed (see, for example, Patent Document 1).

JP-A-6-273750

  In general, a fluorescent lamp applies a suspension for forming a phosphor layer inside a straight tube-shaped bulb with the tube axis substantially along the direction of gravity. By flowing down in the direction of gravity, the thickness of the phosphor layer often differs between the one end and the other end.

  Even in a substantially U-shaped or U-shaped fluorescent lamp, for example, when a plurality of fluorescent lamps are provided in an illumination device, one end and the other end are distinguished and the one end and the other end are alternately arranged. If not so provided, the luminance of the lighting device may be uneven due to the difference in the thickness of the phosphor layer between the one end and the other end.

  Further, in recent years, fluorescent lamps are equipped with power supply terminals at both ends in order to simplify the installation of the lighting device. This is because when the power supply terminal is attached, the power supply terminal only needs to be fitted into a socket provided in the lighting device, and it is not necessary to provide the lighting device with soldering as in the conventional case.

  In order to discriminate between one end and the other end of the fluorescent lamp having power supply terminals attached to both ends, it is conceivable to mark one of the power supply terminals.

  However, fluorescent lamps that are substantially U-shaped or substantially U-shaped are often stored so that both ends thereof are substantially horizontal, and if the marking is not applied around the bulb, the marking is required. It may not be recognized. That is, when viewed from the direction of viewing the fluorescent lamp stored so that both ends thereof are substantially horizontal (direction substantially perpendicular to the plane including the tube axis of the bulb), one end of the fluorescent lamp and the other It is preferable that the end portion can be distinguished. Further, in order to perform marking so as to go around the valve, a marking device for that purpose is required, which imposes a heavy burden on workability and cost.

  Accordingly, the fluorescent lamp according to the present invention aims to make it easy to distinguish one end portion from the other end portion without marking, in a substantially U-shaped or U-shaped fluorescent lamp.

  Another object of the illumination device, the method for manufacturing the illumination device, and the image display device according to the present invention is to suppress uneven brightness when a fluorescent lamp having a substantially U-shape or a substantially U-shape is provided.

  In order to solve the above-described problems, a fluorescent lamp according to the present invention has a phosphor layer formed on the inner surface, and is provided inside a substantially U-shaped or U-shaped bulb and both ends of the bulb. A fluorescent lamp having an electrode, a lead wire having one end connected to the electrode and the other end led out of the bulb, and a power supply terminal connected to the lead wire, including a tube axis of the bulb One power supply terminal and the other power supply terminal can be distinguished when viewed from a direction substantially perpendicular to the plane.

  In the fluorescent lamp according to the present invention, it is preferable that one of the power supply terminals and the other power supply terminal have different apparent shapes. Here, the “apparent shape” means a planar shape when the fluorescent lamp is viewed from a direction substantially perpendicular to the plane including the tube axis of the bulb.

  In the fluorescent lamp according to the present invention, it is preferable that the one feeding terminal and the other feeding terminal have different circumferential directions. Here, the “direction in the circumferential direction” refers to the direction in the rotational direction with the longitudinal direction of the lead wire as the rotational axis.

  Furthermore, in the fluorescent lamp according to the present invention, it is preferable that the direction of the circumferential direction between the one power supply terminal and the other power supply terminal is different within a range of 15 [°] or more and 165 [°] or less.

  In the fluorescent lamp according to the present invention, it is preferable that the positions of the one power supply terminal and the other power supply terminal are different in the longitudinal direction of the power supply terminal.

  Further, in the fluorescent lamp according to the present invention, the power supply terminal has a main body that covers an end of the bulb, and a connection that extends from the main body and is connected to the lead wire. It is preferable that the shape of the connection portion between the power supply terminal and the other power supply terminal is different.

  In the fluorescent lamp according to the present invention, the power supply terminal includes a main body that covers an end of the bulb, and a connection that extends from the main body and is connected to the lead wire. Are preferably provided with slits, and the positions of the ends of the phosphor layers that are visible through the slits of the one power supply terminal and the other power supply terminal are preferably different.

  An illumination device according to the present invention includes the fluorescent lamp.

  The manufacturing method of the illuminating device according to the present invention includes a step of discriminating between the one power supply terminal and the other power supply terminal of the fluorescent lamp, and a step of installing the fluorescent lamp in the illuminating device.

  The image display device according to the present invention includes the illumination device.

  The fluorescent lamp according to the present invention can easily distinguish one end portion from the other end portion without marking in a substantially U-shaped or U-shaped fluorescent lamp.

  In addition, the illumination device, the method for manufacturing the illumination device, and the image display device according to the present invention can suppress uneven luminance when provided with a substantially U-shaped or substantially U-shaped fluorescent lamp.

The front view of the fluorescent lamp which concerns on the 1st Embodiment of this invention Similarly, a cross-sectional view including the tube axis of the fluorescent lamp (A) The principal part enlarged side view of the fluorescent lamp, (b) The principal part enlarged front view of the fluorescent lamp, (c) The principal part enlarged side view of the fluorescent lamp before connection of one power supply terminal, (d) Enlarged front view of the main part of the fluorescent lamp (A) The principal part enlarged side view of the fluorescent lamp when the direction of the circumference of the one feeding terminal and the other feeding terminal is different by 15 [°], (b) The principal part enlarged front view of the fluorescent lamp, ) An enlarged side view of the main part of the fluorescent lamp when the direction of the circumferential direction of one power supply terminal and the other power supply terminal is different by 45 [°], (d) An enlarged front view of the main part of the fluorescent lamp. The partially cutaway front view of the illuminating device which concerns on the 2nd Embodiment of this invention. The perspective view of the image display apparatus which concerns on the 3rd Embodiment of this invention. (A) The principal part enlarged front view of the modification 1 of the fluorescent lamp which concerns on the 1st Embodiment of this invention, (b) The principal part enlarged front view of the modification 2 of a fluorescent lamp similarly (A) The principal part expanded front view of the modification 3 of a fluorescent lamp similarly, (b) The principal part enlarged side view of the modification 4 of a fluorescent lamp similarly (c) The principal part enlarged front view of the modification 4 of a fluorescent lamp similarly (A) The principal part enlarged front view of the modification 5 of a fluorescent lamp similarly, (b) The principal part enlarged front view of the modification 6 of a fluorescent lamp similarly (A) Main part enlarged front view of modification 1 of power supply terminal, (b) Main part enlarged front view of modification 2 of power supply terminal, (c) Main part enlarged front view of modification 3 of power supply terminal A perspective view of a conventional lighting device

(First embodiment)
A front view of a fluorescent lamp according to a first embodiment of the present invention in FIG. 1, respectively a cross-sectional view including the tube axis X ₁₀₀ in FIG. The fluorescent lamp according to the first embodiment of the present invention (hereinafter referred to as “lamp 100”) has a phosphor layer 101 formed on its inner surface, a substantially U-shaped or U-shaped bulb 102, and a bulb 102. Electrodes 103 and 104 provided at both ends of the lead wire 105, 106 having one end connected to the electrodes 103 and 104 and the other end led to the outside of the valve 102, and lead wires 105 and 106 The power supply terminals 107 and 108 are connected.

  The bulb 102 is made of, for example, borosilicate glass for sealing a tungsten wire, and its tube axis has a substantially U-shape, and a cross section cut perpendicular to the tube axis has a substantially annular shape. Specifically, for example, the outer diameter is 4 [mm], the inner diameter is 3 [mm], and the total length is 1500 [mm]. The valve 102 is not limited to a tube shape whose tube axis is substantially U-shaped. For example, the tube shaft may have a substantially U-shape.

  The valve 102 is filled with, for example, 3 [mg] of mercury, and a rare gas such as argon or neon is sealed at a predetermined sealing pressure, for example, 40 [Torr]. As the rare gas, for example, a mixed gas of argon and neon is used in a ratio of Ar = 10 [mol%] and Ne = 90 [mol%].

The phosphor layer 101 formed on the inner surface of the bulb 102 includes, for example, a red phosphor (Y ₂ O ₃ : Eu ³⁺ ), a green phosphor (LaPO ₄ : Ce ³⁺ , Tb ³⁺ ), and blue fluorescence. It is made of a rare earth phosphor composed of a body (BaMg ₂ Al ₁₆ O ₂₇ : Eu ²⁺ ). Further, between the inner surface of the bulb 102 and the phosphor layer 101, for example, yttrium oxide (Y ₂ O ₃ ), silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zinc oxide (ZnO), oxide A protective film (not shown) of metal oxide such as titanium (TiO ₂ ) may be provided.

  The electrodes 103 and 104 have, for example, a cylindrical shape with a bottom, an inner diameter of 2.3 [mm], an outer diameter of 2.7 [mm], a bottom thickness of 0.2 [mm], and a total length of 10 [ mm] and made of nickel (Ni). The material of the electrodes 103 and 104 is not limited to nickel, and one or more of nickel, niobium (Nb), molybdenum (Mo), tantalum (Ta), and tungsten (W) can be used. Note that, when the material of the electrodes 103 and 104 is an alloy of nickel and niobium, it is inexpensive and can improve the sputtering resistance.

  The electrodes 103 and 104 are connected to one end surfaces of the lead wires 105 and 106 at a substantially central portion of the outer bottom surface thereof. The electrodes 103 and 104 and the lead wires 105 and 106 may be directly connected, or may be indirectly connected via a brazing material made of Kovar or nickel.

  The lead wires 105 and 106 include, for example, internal lead wires 105a and 106a that are connected to the bulb 102 at a part of the side surface, and are connected to the inner bottom wires 105a and 106a. It consists of a connection with external lead wires 105b and 106b to which the other end and one end are connected.

  The internal lead wires 105a and 106a have, for example, a wire diameter of 0.8 [mm] and are made of tungsten. The internal lead wires 105a and 106a are preferably made of a material that matches the thermal expansion coefficient of the glass used as the material of the bulb 102 and the beads 109 and 110. For example, when the valve 102 is borosilicate glass for sealing Kovar wire, it is preferable to use an alloy of iron, nickel and cobalt (Kovar). When the bulb 102 is soft glass such as lead-free glass or soda glass, it is preferable to use an alloy of iron and nickel.

  The external lead wires 105b and 106b have, for example, a wire diameter of 0.6 [mm] and are made of nickel. The material of the external lead wires 105b and 106b is not limited to nickel, and may be, for example, an alloy of nickel and manganese or a dumet wire.

  The lead wires 105 and 106 (in the case of the lamp 100, the internal lead wires 105a and 106a) are sealed to the bulb 102 via the beads 109 and 110.

  The beads 109 and 110 have a substantially spherical shape and seal the internal lead wires 105a and 106a along their substantially central axes, and are made of, for example, borosilicate glass for sealing tungsten wires. The beads 109 and 110 are preferably made of the same material as the valve 102 or a material having the same or similar thermal expansion coefficient as the valve 102 from the viewpoint of sealing properties. In FIG. 1, the internal lead wires 105a and 106a are sealed to the valve 102 via the beads 109 and 110, but may be directly sealed to the valve 102 by a pinch seal method or the like.

  The power supply terminals 107 and 108 extend from the main body portions 107a and 108a covering the end of the bulb 102, and the main body portions 107a and 108a, and are connected to lead wires 105 and 106 (in the case of the lamp 100, external lead wires 105b and 106b). Connecting portions 107b and 108b. The power supply terminals 107 and 108 are conductive, and a single metal plate is processed to integrally form the main body portions 107a and 108a and the connection portions 107b and 108b. The power supply terminals 107 and 108 are made of an alloy of iron and nickel, for example. The material of the power supply terminals 107 and 108 is not limited to an alloy of iron and nickel, and for example, an iron alloy such as stainless steel, a copper alloy such as phosphor bronze, brass, or white can be used. The main body portions 107a and 108a and the connection portions 107b and 108b may be formed of different materials.

  The main body portions 107a and 108a have a substantially cylindrical shape.

  Support portions 107c and 108c that support the valve 102 are formed on the side surfaces of the main body portions 107a and 108a so as to protrude radially inward. Thereby, it is possible to prevent the portions of the main body portions 107a and 108a excluding the support portions 107c and 108c from coming into contact with the bulb 102, and to reduce the contact area between the bulb 102 and the main body portions 107a and 108a. Sometimes, heat generated in the electrodes 103 and 104 can be prevented from being dissipated excessively through the power supply terminals 107 and 108, and the concentration of mercury around the electrodes 103 and 104 can be reduced by lowering the temperature around the electrodes 103 and 104. It is possible to prevent the lamp 100 from becoming thin and difficult to turn on the lamp 100.

  In the case of the lamp 100, a part of the side surfaces of the main body portions 107a and 108a is cut out and extended from the connection portions 107b and 108b in the longitudinal direction of the power supply terminals 107 and 108 toward the side opposite to the connection portions 107b and 108b. Supporting portions 107c and 108c are formed.

  Furthermore, it is preferable that the support portions 107c and 108c are bent in the vicinity of the tip portion thereof on the side opposite to the valve 102. Since the support portions 107c and 108c extend from the connection portions 107b and 108b in the longitudinal direction of the power supply terminals 107 and 108 toward the side opposite to the connection portions 107b and 108b, the support portions 107c and 108c are connected to the valve 102. When the valve 102 is inserted into the main body portions 107a and 108a, the distal ends of the support portions 107c and 108c are easy to open outward in the radial direction of the valve 102, and the valve 102 can be easily inserted. can do.

  Note that it is preferable that three or more support portions 107c and 108c are formed at substantially equal intervals in the circumferential direction on the side surfaces of the main body portions 107a and 108a. In this case, the valve 102 can be supported more stably.

A gap is preferably provided between the support portions 107c and 108c and the portions of the main body portions 107a and 108a other than the support portions 107c and 108c. In this case, it is possible to prevent the support portions 107c and 108c from being caught by the main body portions 107a and 108a when the power supply terminals 107 and 108 are attached. Specifically, as shown in FIG. 1, the gap S ₁ along the extending direction of the support portions 107c and 108c is preferably 0.1 [mm] or more. Even more preferably, the gap S ₁ is in the range of 0.2 [mm] to 1.0 [mm]. Further, the clearance S ₂ of the main body 107a, 108a extending direction end portion side of, and more preferably 0.2 [mm] or more. Even more preferably, the gap S ₂ is in the range of 0.3 [mm] to 1.0 [mm].

  Further, auxiliary support members 107d and 108d may be formed on the side surfaces of the main body portions 107a and 108a so as to be opposite to the support portions 107c and 108c in the longitudinal direction of the power supply terminals 107 and 108, respectively. In this case, the inclination of the main body portions 107a and 108a with respect to the valve 102 can be suppressed, and the load on the valve 102 can be reduced.

Incidentally, the gap S ₃ between the outer surface of the body portion 107a, 108a inner surface and the valve 102 is preferably at 0.1 [mm] or more. In this case, the valve 102 can be easily inserted into the main body portions 107a and 108a. Furthermore, the gap S ₃ is more preferably in the range of 0.1 [mm] to 0.5 [mm]. Even more preferably, the gap S ₃ is in the range of 0.1 [mm] or more 0.3 [mm] or less.

  The connecting portions 107b and 108b extend from the main body portions 107a and 108a and are connected to lead wires 105 and 106 (in the case of the lamp 100, external lead wires 105b and 106b). Specifically, the connection portions 107b and 108b are contact portions 107e and 108e connected to the external lead wires 105b and 106b, one end portions are connected to the contact portions 107e and 108e, and the other end portions are the main body portions 107a and 108a. And connecting portions 107f and 108f connected to each other.

  The contact portions 107e and 108e are, for example, cylindrical, and after the external lead wires 105b and 106b are passed through the contact portions 107e and 108e, the connection is stabilized by welding such as resistance welding or laser welding. The connection between the contact portions 107e and 108e and the external lead wires 105b and 106b is not limited to welding, and caulking, soldering, or the like may be used.

  The connecting portions 107f and 108f connect the contact portions 107e and 108e and the main body portions 107a and 108a. The cross-sectional area cut substantially perpendicular to the extending direction of the connecting portions 107f and 108f is preferably smaller than the cross-sectional area cut substantially perpendicular to the linear axis direction of the external leads 105b and 106b. In this case, it is possible to prevent heat generated in the electrodes 103 and 104 from being radiated excessively from the external lead wires 105b and 106b to the main body portions 107a and 108a via the connecting portions 107f and 108f.

  As shown in FIG. 1, when viewed from a direction substantially perpendicular to a plane including the tube axis of the valve 102, one power supply terminal 107 and the other power supply terminal 108 can be distinguished.

  In the case of the lamp 100 shown in FIG. 1, the direction of the circulation direction of one power supply terminal 107 and the other power supply terminal 108 is different. In this case, when viewed from a direction substantially perpendicular to the plane including the tube axis of the valve 102, the apparent shape of one of the power supply terminals 107 and the other power supply terminal 108 is different, so that one of the power supply terminals 107. And the other power supply terminal 108 can be discriminated.

  An enlarged side view of the essential part of the lamp 100 is shown in FIG. 3 (a), and an enlarged front view of the essential part is shown in FIG. 3 (b). As shown in FIG. 3A, the one feeding terminal 107 and the other feeding terminal 108 of the lamp 100 are different in the direction of the circumferential direction by approximately 90 [°]. Thereby, when viewed from a direction substantially perpendicular to the plane including the tube axis of the valve 102, it is possible to discriminate between one power supply terminal 107 and the other power supply terminal 108. For example, as shown in FIG. 3A, the direction of the circuit direction is determined by the angle of the line including the connecting portions 107f and 108f of the power supply terminals 107 and 108 and the external lead wires 105b and 106b. That is, an angle between a line (broken line) including the connecting portion 107f of one power supply terminal 107 and the external lead wire 105b and a line (dotted line) including the connecting portion 108f of the other power supply terminal 108 and the external lead wire 106b. The difference R is obtained.

  As shown in FIG. 3B, when viewed from a direction substantially perpendicular to the plane including the tube axis of the valve 102, one power supply terminal 107 has its connecting portion 107f overlapping the external lead wire 105b. Although not visible, the other feeding terminal 108 can be seen where the connecting portion 108f does not overlap the external lead wire 106b. Based on this difference, it is possible to discriminate between one power supply terminal 107 and the other power supply terminal 108.

  Further, since the apparent sizes of the contact portions 107e and 108e of the one power supply terminal 107 and the other power supply terminal 108 are different, the one power supply terminal 107 and the other power supply terminal 108 can be distinguished. . In this case, when connecting the contact portions 107e and 108e of the one power supply terminal 107 and the other power supply terminal 108 to the external lead wires 105b and 106b, the resistance is adjusted in accordance with the direction of the circumferential direction of the power supply terminals 107 and 108. It is preferable to change the direction in which welding or caulking is sandwiched.

  FIG. 3 (c) shows an enlarged side view of the main part of the lamp end portion before connection of one power supply terminal 107, and FIG. 3 (d) shows an enlarged front view of the main part. As shown in FIGS. 3C and 3D, the contact portion 107e before being connected to the external lead wire 105b has a substantially cylindrical shape, and the external lead wire 105b is inserted into the cavity portion, By sandwiching the outer side surface from the opposite position, the external lead wire 105b is connected. At this time, the contact portion 107e is crushed so as to be stretched in a direction substantially perpendicular to the sandwiched direction. Thereby, when viewed from a direction substantially perpendicular to the surface including the tube axis of the valve 102, the apparent shape (size) of the contact portion 107e changes as the power supply terminal 107 rotates in the circumferential direction. Can be made.

  FIG. 4A is an enlarged side view of a main part of the lamp 100 when the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 is different by 15 [°] (that is, when R = 15 [°]). Similarly, an enlarged front view of the main part is shown in FIG. As shown in FIG. 4B, one power supply terminal 107 cannot be seen because its connecting portion 107f overlaps the external lead wire 105b, but the other power supply terminal 108 has its connecting portion 108f connected to the external lead wire 106b. You can see the non-overlapping parts. Based on this difference, it is possible to discriminate between one power supply terminal 107 and the other power supply terminal 108. Note that, even when the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 is different by 165 [°], the overlapping of the connecting portion 108f of the other power supply terminal 108 and the external lead wire 105b occurs. The same except for the reverse. The connecting portion 108f of the other power supply terminal 108 is connected to the external lead wire 106b as the direction of the circumferential direction between the one power supply terminal 107 and the other power supply terminal 108 increases from 15 [°] or decreases from 165 [°]. Since the portion that does not overlap with the surface is apparently larger, it becomes easier to distinguish one power supply terminal 107 from the other power supply terminal 108. That is, it is preferable that the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 be different within a range of 15 [°] or more and 165 [°] or less. In this case, due to the difference between the connecting portions 107f and 108f of the power supply terminals 107 and 108 and the lead wires 105 and 106 (in the case of the lamp 100, the external lead wires 105b and 106b), one power supply terminal 107 and the other This makes it easy to distinguish the power supply terminal 108. Further, when viewed from a direction substantially perpendicular to the plane including the tube axis of the bulb 102, considering the case where the connecting portion 107f of the one power supply terminal 107 and the external lead wire 105b do not overlap, It is preferable that the direction of the circumferential direction of the power supply terminal 107 and the other power supply terminal 108 be different within a range of 30 [°] to 150 [°]. In this case, when viewed from a direction substantially perpendicular to the plane including the tube axis of the valve 102, the connecting portions 107f and 108f of one power supply terminal 107 and the other power supply terminal 108 are both external lead wires 105b and 106b. Even if they do not overlap, the apparent shapes (sizes) of the connecting portions 107f and 108f can be detected to make it easy to distinguish one power supply terminal 107 from the other power supply terminal 108.

  FIG. 4C is an enlarged side view of a main part of the lamp 100 when the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 is different by 45 [°] (that is, when R = 45 [°]). Similarly, an enlarged front view of the main part is shown in FIG. As shown in FIGS. 4C and 4D, the apparent size of the contact portion 108 e of the other power supply terminal 108 is larger than that of the contact portion 107 e of the one power supply terminal 107. Based on this difference, it is possible to discriminate between one power supply terminal 107 and the other power supply terminal 108. This is the same even when the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 is different by 135 [°]. The apparent size of the contact portion 108e of the other power supply terminal 108 becomes smaller as the direction of the circumferential direction of one power supply terminal 107 and the other power supply terminal 108 increases from 45 [°] or decreases from 135 [°]. Therefore, it becomes easy to distinguish one power supply terminal 107 from the other power supply terminal 108. That is, it is more preferable that the direction of the circumferential direction between the one power supply terminal 107 and the other power supply terminal 108 be different within a range of 45 [°] to 135 [°]. In this case, the difference between the apparent sizes of the contact portions 107e and 108e between the one power supply terminal 107 and the other power supply terminal 108 can make it easy to distinguish between the one power supply terminal 107 and the other power supply terminal 108. .

  As described above, according to the configuration of the fluorescent lamp 100 according to the first embodiment of the present invention, in the fluorescent lamp 100 having a substantially U shape or a substantially U shape, one end and the other end are provided without marking. Can be easily distinguished.

(Second Embodiment)
FIG. 5 shows a partially cutaway front view of a lighting apparatus according to the second embodiment of the present invention. An illumination apparatus according to the second embodiment of the present invention (hereinafter referred to as “illumination apparatus 200”) is a direct-type backlight unit, and includes a rectangular parallelepiped casing 201 having one surface opened, and the casing. A plurality of lamps 100 housed in the body 201, a socket 202 for electrically connecting the lamps 100 to a lighting circuit (not shown), and an optical sheet 203 covering an opening of the housing 201. Prepare. The lamp 100 is the fluorescent lamp 100 according to the first embodiment of the present invention.

  The casing 201 is made of, for example, polyethylene terephthalate (PET) resin, and a reflective surface 204 is formed on the inner surface thereof by vapor deposition of a metal such as silver. In addition, as a material of the housing | casing 201, you may comprise by metal materials, such as materials other than resin, for example, aluminum, a cold rolled material (for example, SPCC). Further, as the inner reflection surface 204, other than the metal vapor deposition film, for example, a material obtained by pasting a reflection sheet with a higher reflectance by adding calcium carbonate, titanium dioxide or the like to polyethylene terephthalate (PET) resin is used. May be.

  A socket 202 is disposed inside the housing 201. Specifically, the sockets 202 are provided at predetermined intervals in the lateral direction (longitudinal direction) of the housing 201 corresponding to the arrangement of the lamps 200. The socket 202 includes an electrical connection portion 202a for electrically connecting to the power supply terminals 107 and 108, and an insulating portion 202b for insulating the vicinity of the contact portion between the power supply terminals 107 and 108 and the electrical connection portion 202a from the surroundings. Have.

  The electrical connection portion 202a is obtained by processing a plate material made of, for example, stainless steel or phosphor bronze, and has a substantially U shape so that the power supply terminals 107 and 108 can be fitted therein. Then, the power supply terminals 107 and 108 are elastically deformed and fitted so as to expand the electrical connection portion 202a. As a result, the power supply terminals 107 and 108 fitted in the electrical connection portion 202a are pressed by the restoring force of the electrical connection portion 202a and are not easily detached. Accordingly, the power supply terminals 107 and 108 can be easily fitted into the electrical connection portion 202a, but can be prevented from coming off. The electrical connection portion 202a is connected to a lighting circuit (not shown) through a power supply lead wire (not shown). The electrical connection portion 202a is not limited to a substantially U shape, and may be a cap shape, a coil shape, or the like.

  The insulating portion 202b is made of, for example, polyethylene terephthalate (PET), and is provided so as to surround the power supply terminals 107 and 108 and the electrical connection portion 202a. Note that the insulating portion 202b is not limited to the above configuration. Since the electrical connection portion 202a is in the vicinity of the electrodes 103 and 104 that become relatively hot during the operation of the lamp 100, the insulating portion 202b is preferably made of a heat resistant material. As a material of the heat-resistant insulating portion 202b, for example, polycarbonate (PC) resin, silicon rubber, or the like can be applied.

  Inside the housing 201, a lamp holder 205 may be provided at a place as necessary. The lamp holder 205 that fixes the position of the lamp 100 inside the housing 201 is, for example, polycarbonate (PC) resin, and has a shape that follows the outer shape of the lamp 100. “A place where necessary” means that the deflection of the lamp 100 is caused when the lamp 100 has a long length exceeding, for example, 600 [mm], as in the vicinity of the central portion of the lamp 100 in the longitudinal direction. It is a place necessary to eliminate. In the lighting device 200, a lamp holder 205 is provided to support the vicinity of the bent portion of the lamp 100.

  The opening of the housing 201 is covered with a light-transmitting optical sheet 203 and is sealed so that foreign matters such as dust and dust do not enter inside. The optical sheet 203 is formed by laminating a diffusion plate 206, a diffusion sheet 207, and a lens sheet 208.

  The diffusion plate 206 is a plate-like body made of, for example, polymethyl methacrylate (PMMA) resin, and is arranged so as to close the opening of the housing 201. The diffusion sheet 207 is made of, for example, a polyester resin. The lens sheet 208 is a laminate of, for example, an acrylic resin and a polyester resin. These optical sheets 203 are arranged so as to be sequentially superimposed on the diffusion plate 206.

  Next, a method for manufacturing the lighting device 200 will be described below.

The manufacturing method of the lighting device 200 includes a step of discriminating one power supply terminal 107 and the other power supply terminal 108 of the lamp 100 (discrimination step), and a step of mounting the lamp 100 inside the lighting device 200 (equipment step). Have.
1. Discrimination process First, when one power supply terminal 107 and the other power supply terminal 108 of the lamp 100 placed on a packaging box, a stand, etc. are viewed, due to the difference in the apparent shape or the like, The power supply terminal 108 is discriminated.

  The lamp 100 is aligned by rotating the lamp 100 in accordance with the determined direction of the one power supply terminal and the other power supply terminal.

In addition, you may perform a discrimination | determination process using a sensor etc. The sensor is, for example, an image sensor that is a kind of optical sensor. For example, one power supply terminal is detected by detecting whether or not the external lead wires 105b and 106b overlap with the connection portions 107b and 108b of the power supply terminals 107 and 108, for example. 107 and the other power supply terminal 108 can be discriminated.
2. Mounting Step Next, the lamp 100 is mounted inside the lighting device 200.

  As shown in FIG. 5, the power supply terminals 107 and 108 are fitted into the electrical connection portions 202 a of the socket 202, respectively. Thereby, the lamp 100 is electrically connected to the lighting device 200. When the lamp holder 205 is provided in the lighting device 200, the bulb 102 is fitted into the lamp holder 205.

  As shown in FIG. 5, the lamp 100 is provided in the lighting device 200 so that one power supply terminal 107 and the other power supply terminal 108 are alternated, whereby the thick part and the thin part of the phosphor layer 101 are alternately arranged. As a result, the luminance unevenness of the lighting device 200 can be suppressed.

  Note that the direction and position in which the lamp 100 is inserted can be appropriately changed depending on the size of the lighting device 200, the number of the lamps 100, the interval between the lamps 100, and the like.

  The lighting device 200 is completed through the above steps.

  As described above, according to the configuration of the illumination device 200 according to the second embodiment of the present invention, uneven luminance can be suppressed.

(Third embodiment)
FIG. 6 shows an outline of an image display apparatus according to the third embodiment of the present invention. As shown in FIG. 6, an image display device 300 is, for example, a 32 [inch] liquid crystal television (liquid crystal display device), a liquid crystal screen unit 301 including a liquid crystal panel and the like, and an illumination device 200 according to the second embodiment of the present invention. And a lighting circuit 302.

  The liquid crystal screen unit 301 is a known one and includes a liquid crystal panel (color filter substrate, liquid crystal, TFT substrate, etc.) (not shown), a drive module, etc. (not shown), and is based on an image signal from the outside. To form a color image.

  The lighting circuit 302 lights the lamp 100 inside the lighting device 200. The lamp 100 is operated at a lighting frequency of 40 [kHz] to 100 [kHz] and a lamp current of 3.0 [mA] to 25 [mA].

  As described above, according to the configuration of the image display device 300 according to the third embodiment of the present invention, luminance unevenness can be suppressed.

(Modification)
As described above, the present invention has been described based on the specific examples shown in the above embodiments. However, the content of the present invention is not limited to the specific examples shown in the respective embodiments. Variations can be used.
1. Modified example of fluorescent lamp 1-1. Modification 1
FIG. 7A shows a front view of Modification Example 1 of the fluorescent lamp according to the first embodiment of the present invention. Modification 1 (hereinafter referred to as “lamp 111”) of the fluorescent lamp according to the first embodiment of the present invention has substantially the same configuration as that of the lamp 100 except that the configuration of the other power supply terminal 108 is different. It is what has. Therefore, the other power supply terminal 108 will be described in detail, and description of other points will be omitted.

  In the lamp 111, the positions of one power supply terminal 107 and the other power supply terminal 108 are different in the longitudinal direction of the power supply terminals 107 and 108.

As shown in FIG. 7A, in the longitudinal direction of the power supply terminals 107 and 108, the position of the end of the lamp 111 at the center of the main body 107a and 108a of each of the power supply terminal 107 and the other power supply terminal 108 is shown. By detecting the difference P ₁ , it is possible to discriminate between one power supply terminal 107 and the other power supply terminal 108. Further, the one power supply terminal 107 and the other power supply terminal 108 are also discriminated by detecting the difference P _{2 in} the position of the tip of each contact portion 107e, 108e between the one power supply terminal 107 and the other power supply terminal 108. be able to. Further, the one power supply terminal 107 and the other power supply terminal 108 are discriminated by detecting the difference in the positions of the support portions 107c and 108c and the auxiliary support portions 107d and 108d of the one power supply terminal 107 and the other power supply terminal 107. You can also

  In the lamp 111, the other power supply terminal 108 is closer to the tip of the external lead wire than the one power supply terminal 107, so the external lead wire 106 b connected to the other power supply terminal 108 is connected to the one power supply terminal 107. Longer than the external lead wire 105b. Note that the external lead wire 106 b connected to the other power supply terminal 108 may have substantially the same length as the external lead wire 105 b connected to one power supply terminal 107.

P ₁ and P ₂ are preferably in the range of 1 [mm] to 5 [mm]. In this case, it is easy to distinguish one power supply terminal 107 from the other power supply terminal, and it is possible to prevent the invalid light emission length from being increased by making the external lead wire 106b on the other power supply terminal 108 side too long. More preferably, P ₁ and P ₂ are in the range of 2 [mm] to 4 [mm].
1-2. Modification 2
FIG. 7B shows a front view of Modification Example 2 of the fluorescent lamp according to the first embodiment of the present invention. Modification 2 (hereinafter referred to as “lamp 112”) of the fluorescent lamp according to the first embodiment of the present invention, except that the position of the other power supply terminal 108 in the longitudinal direction of the power supply terminals 107 and 108 is different. Has substantially the same configuration as the lamp 111. Therefore, the position of the other power supply terminal 108 in the longitudinal direction of the power supply terminals 107 and 108 will be described in detail, and description of other points will be omitted.

When the lamp 112 is viewed from a direction substantially perpendicular to the tube axis of the bulb 102, the end portion of the bulb 102 on the one feeding terminal 107 side is hidden behind the main body portion 107 a of the one feeding terminal 107 and cannot be seen. The end of the valve 102 on the other power supply terminal 108 side is visible because it is closer to the tip of the external lead wire 106 b than the main body 108 a of the other power supply terminal 108. Therefore, one power supply terminal 107 and the other power supply terminal 108 are discriminated based on whether or not the end of the valve 102 is visible on the side of the external lead wires 105b and 106b from the main body portions 107a and 108a of the power supply terminals 107 and 108. be able to. The length P ₃ from the end of the valve 102 on the other power supply terminal 108 side to the end on the external lead wire 106b side of the main body 108a of the other power supply terminal 108 is 1 [mm] or more and 5 [mm] or less. It is preferable to be within the range. In this case, it is easy to distinguish between the one power supply terminal 107 and the other power supply terminal 108, the contact portion 108e of the other power supply terminal 108 is too close to the end of the valve 102, and when connecting to the external lead wire 106b, It is possible to prevent the valve 102 from being damaged by a thermal shock or the like. More preferably, P ₃ is in the range of 2 [mm] or more 4 [mm] or less.

When viewed from a direction substantially perpendicular to the tube axis of the valve 102, the apparent length P _{4 of the} external lead wire 105 b connected to one power supply terminal 107 and the other power supply terminal 108 are connected. the difference in length P ₅ of the apparent external leads 106b, it is also possible to determine the one of the power supply terminal 107 and the other power supply terminal 108. The difference between P ₄ and P ₅ is preferably in the range of 1 [mm] to 5 [mm]. In this case, it is easy to distinguish one power supply terminal 107 from the other power supply terminal 108, and it is possible to prevent the invalid light emission length from being increased by making the external lead wire 106b on the other power supply terminal 108 side too long. . More preferably, the difference between P ₄ and P ₅ is in the range of 2 [mm] to 4 [mm].

P ₅ is preferably in the range of 1 [mm] to 7 [mm]. In this case, it is easy to distinguish between the one power supply terminal 107 and the other power supply terminal 108, the contact portion 108e of the other power supply terminal 108 is too close to the end of the valve 102, and when connecting to the external lead wire 106b, It is possible to prevent the valve 102 from being damaged by a thermal shock or the like. More preferably, P ₅ is in the range of 3 [mm] or more 5 [mm] or less.
1-3. Modification 3
FIG. 8A shows an enlarged front view of the main part of Modification 3 of the fluorescent lamp according to the first embodiment of the present invention. Modification 3 (hereinafter referred to as “lamp 113”) of the fluorescent lamp according to the first embodiment of the present invention, except that the position of the other power supply terminal 108 in the longitudinal direction of the power supply terminals 107 and 108 is different. Has substantially the same configuration as the lamp 111. Therefore, the position of the other power supply terminal 108 in the longitudinal direction of the power supply terminals 107 and 108 will be described in detail, and description of other points will be omitted.

  In the lamp 113, the positions of the one power supply terminal 107 and the other power supply terminal 108 are substantially the same in the longitudinal direction of the power supply terminals 107 and 108, and the external lead wire 106 b connected to the other power supply terminal 108 has one power supply. It is longer than the external lead wire 105 b connected to the terminal 107. Specifically, the tip of the external lead wire 105b connected to one power supply terminal 107 is substantially at the same position as the tip of the contact portion 107e of one power supply terminal 107, but connected to the other power supply terminal 108. The leading end of the external lead wire 106 b is in a position protruding from the contact portion 108 e of the other power supply terminal 108. Therefore, one power supply terminal 107 and the other power supply terminal 108 can be discriminated by detecting the difference in length between the external lead wires 105b and 106b.

The length P _{6 of the} portion where the external lead wire 106 b connected to the other power supply terminal 108 protrudes from the contact portion 108 e of the other power supply terminal 108 is in the range of 1 [mm] to 4 [mm]. It is preferable that In this case, it is easy to distinguish one power supply terminal 107 from the other power supply terminal 108, and it is possible to prevent the invalid light emission length from being increased by making the external lead wire 106b on the other power supply terminal 108 side too long. . More preferably, P ₆ is in the range of 2 [mm] to 3 [mm].
1-4. Modification 4
FIG. 8B shows an enlarged front view of the main part of Modification 4 of the fluorescent lamp according to the first embodiment of the present invention. Modification 4 (hereinafter referred to as “lamp 114”) of the fluorescent lamp according to the first embodiment of the present invention is a contact portion between the external lead wire 106b connected to the other power supply terminal 108 and the other power supply terminal 108. It has substantially the same configuration as the lamp 113 except that the configuration of 108e is different. Therefore, the external lead wire 106b connected to the other power supply terminal 108 and the contact portion 108e of the other power supply terminal 108 will be described in detail, and description of other points will be omitted.

In the lamp 114, the shapes of the contact portions 107e and 108e of one power supply terminal 107 and the other power supply terminal 108 are different. Specifically, the direction in which the contact portions 107e and 108e are caulked differs between one power supply terminal 107 and the other power supply terminal 108. Thereby, for example, as shown in FIG. 8B, the contact portion 107e of one power supply terminal 107 has a length in a direction substantially parallel to the plane including the tube axis of the bulb 102. The contact portion 108e of the other power supply terminal 108 is longer than the length, and the length in the direction substantially perpendicular to the plane including the tube axis of the valve 102 is shorter than the length in the direction substantially parallel to the tube 102 of the valve 102. When viewed from a direction substantially perpendicular to the axis, the width P ₇ of the contact portion 107 e of one power supply terminal 107 is different from the width P ₈ of the contact portion 108 e of the other power supply terminal 108.

The difference between P ₇ and P ₈ is preferably in the range of 0.5 [mm] or more and 3 [mm] or less. In this case, it is easy to distinguish between the one power supply terminal 107 and the other power supply terminal 108, and it is possible to make it difficult to apply a load when the contact portions 107e and 108e are formed. More preferably, the difference between P ₇ and P ₈ is in the range of 1 [mm] to 3 [mm].
1-5. Modification 5
The principal part enlarged front view of the modification 5 of the fluorescent lamp concerning the 1st Embodiment of this invention is shown to Fig.9 (a). The fluorescent lamp modification 5 (hereinafter referred to as “lamp 115”) according to the first embodiment of the present invention is substantially the same as the lamp 114 except that the configuration of the contact portion 108e of the other power supply terminal 108 is different. Have the same structure. Therefore, the contact portion 108e of the other power supply terminal 108 will be described in detail, and description of other points will be omitted.

  The lamp 115 is different in the welding method of the contact portions 107e and 108e of one power supply terminal 107 and the other power supply terminal 108. As a result, the shapes of the contact portions 107e and 108e of the one power supply terminal 107 and the other power supply terminal 108 are different, and by detecting this difference, it is possible to distinguish between the one power supply terminal 107 and the other power supply terminal 108. it can.

  Specifically, one power supply terminal 107 is connected to the external lead wire 105b by resistance welding. In this case, the contact portion 108e of the other power supply terminal 108 is connected to the external lead wire 106b by laser welding. In this case, the contact portion 108e of the other power supply terminal 108 is completely melted and has a substantially spherical shape without stopping the original shape.

Note that the connection method of the contact portions 107e and 108e of the one power supply terminal 107 and the other power supply terminal 108 is not limited to resistance welding and laser welding, and various methods such as caulking and soldering are selected. It is possible.
1-6. Modification 6
FIG. 9B shows an enlarged front view of the main part of Modification 6 of the fluorescent lamp according to the first embodiment of the present invention. The sixth modification of the fluorescent lamp according to the first embodiment of the present invention (hereinafter referred to as “lamp 116”) is the lamp 115 except that the configurations of the power supply terminals 107 and 108 and the phosphor layer 101 are different. And substantially the same configuration. Therefore, the configuration of the power supply terminals 107 and 108 and the phosphor layer 101 will be described in detail, and description of other points will be omitted.

The lamp 116 is provided with slits in the main body portions 107a and 108a, and the positions of the ends of the phosphor layer 101 that are visible through the slits of the one power supply terminal 107 and the other power supply terminal 108 are different. In the case of the lamp 116, the slit is, for example, a gap between the support portions 107c and 108c and the portions of the main body portions 107a and 108a other than the support portions 107c and 108c, and along the extending direction of the support portions 107c and 108c. it is S _1. In this case, the position of the end of the phosphor layer 101 seen through the gap S ₁ between the _one power supply terminal 107 and the other power supply terminal 108 is different, so that the one power supply terminal 107 and the other power supply terminal 108 are discriminated. be able to.

Note that the difference P _{9 in} the position of the end of the phosphor layer 101 that can be seen through the slit between the one power supply terminal 107 and the other power supply terminal 108 is in the range of 1 [mm] to 6 [mm]. preferable. In this case, it is easy to distinguish between the one power supply terminal 107 and the other power supply terminal 108, and it is possible to prevent the invalid light emission length from being increased by making the other power supply terminals 107 and 108 too long. Even more preferably, P ₉ is in the range of 2 [mm] or more 6 [mm] or less.

In the case of discriminating between one power supply terminal and the other power supply terminal at a position of an end of the phosphor layer visible through the slit, the gap S ₁ is, 0.5 [mm] or more 3 [mm] within the range of It is preferable that In this case, it is easy to distinguish one power supply terminal 107 from the other power supply terminal 108, and the strength of the power supply terminals 107 and 108 can be maintained. More preferably, the gap S ₁ is in the range of 2 [mm] to 3 [mm].

Furthermore, the slit is, for example, a gap S between the auxiliary support members 107d and 108d and the portions of the main body portions 107a and 108a other than the auxiliary support members 107d and 108d and along the extending direction of the auxiliary support members 107d and 108d. _It may be ₄ .

Furthermore, one end of the phosphor layer 101 is located at a position visible through the slit of one power supply terminal 107, and the other end of the phosphor layer 101 is not located at a position visible through the slit of the other power supply terminal 108. May be. In this case, one power supply terminal 107 and the other power supply terminal 108 can be discriminated by the presence or absence of the end of the phosphor layer 101 that can be seen through the slits of the power supply terminals 107 and 108.
2. Modification Examples of Feed Terminals The feed terminals are not limited to the feed terminals 107 and 108, and various configurations can be used.
2-1. Modification 1
The principal part enlarged front view of the modification 1 of a feeding terminal is shown to Fig.10 (a). Modification 1 of the power supply terminal (hereinafter referred to as “power supply terminal 117”) includes a cylindrical main body portion 117a and a connection portion 117b extending from the main body portion 117a, and a slit is formed on a side surface of the main body portion 117a. An elastic piece is formed by 117c. The power supply terminal 117 can support the valve 102 by an elastic piece formed on the main body 117a.

  In addition, it is preferable that three or more slits 117c are formed at substantially equal intervals in the circumferential direction of the main body 117a. In this case, the support of the valve 102 by the elastic piece of the main body 117a can be easily stabilized.

  In addition, it is preferable that the main-body part 117a has a part diameter-reduced rather than the other part of the main-body part 117a in the edge part on the opposite side to the connection part 117b side. In this case, the contact of the valve 102 with the elastic piece of the main body 117a can be easily stabilized by contacting the outer surface of the valve 102 at the reduced diameter portion.

The power feeding terminal 117 can be applied to the fluorescent lamp according to the first embodiment of the present invention and the modifications 1 to 6 thereof. In particular, when applying Modifications 1 to 6 of the fluorescent lamp according to the first embodiment of the present invention, it is possible to easily distinguish one power supply terminal from the other power supply terminal.
2-2. Modification 2
The principal part enlarged front view of the modification 2 of an electric power feeding terminal is shown in FIG.10 (b). The power supply terminal modification 2 (hereinafter referred to as “power supply terminal 118”) has substantially the same configuration as the power supply terminal 117 except for the configuration of the main body 118a. Therefore, the main body 118a will be described in detail, and description of other points will be omitted.

  The power supply terminal 118 has a support portion 118d that protrudes toward the valve 102 at the end opposite to the connection portion 118b side of the main body portion 118a. The power supply terminal 118 can stabilize the support of the valve 102 by the main body 118a when the support 118d contacts the outer surface of the valve.

The power supply terminal 118 can be applied to the fluorescent lamp according to the first embodiment of the present invention and the modifications 1 to 6 thereof. In particular, when applying Modifications 1 to 6 of the fluorescent lamp according to the first embodiment of the present invention, it is possible to easily distinguish one power supply terminal from the other power supply terminal.
2-3. Modification 3
FIG. 10C shows an enlarged front view of the main part of Modification 3 of the power supply terminal. In the third modification of the power supply terminal (hereinafter referred to as “power supply terminal 119”), the main body portion and the connection portion are formed of coils. In this case, the main body 119a can be reduced or expanded in accordance with the outer diameter of the valve 102, and the support of the valve 102 by the main body 119a can be stabilized.

  Further, the connection portion 119b includes a contact portion 119c connected to the external lead wire 105b, and a connecting portion 119d connecting the contact portion 119c and the main body portion 119a. The connecting portion 119d preferably has a coil wound more coarsely than the main body portion 119a and the contact portion 119c. In this case, when the power supply terminal 119 is attached to the socket of the lighting device, the connecting portion 119d serves as a cushioning material to reduce the load transmitted from the main body portion 119a to the external lead wire 105b through the connection portion 119b. it can.

The power supply terminal 119 can be applied to the fluorescent lamp according to the first embodiment of the present invention and the modifications 1 to 6 thereof. In particular, when applying Modifications 1 to 6 of the fluorescent lamp according to the first embodiment of the present invention, it is possible to easily distinguish one power supply terminal from the other power supply terminal. In addition, when applying the modification 6, the clearance gap formed between the coil pitches of the main-body part 119a of the electric power feeding terminal 119 can be made into a slit. The coil pitch is preferably in the range of 1 [mm] to 5 [mm]. In this case, one feeding terminal and the other feeding terminal can be easily distinguished from each other by the position of the end of the phosphor layer that can be seen from the gap formed between the coil pitches. More preferably, it is in the range of 2 [mm] or more and 4 [mm] or less.
3. One power supply terminal and the other power supply terminal In the first embodiment and each modification of the present invention, even if one power supply terminal and the other power supply terminal are configured in reverse, the above-described effects are similarly obtained. It is.
4). Electron Emissive Material An electron emissive material layer (not shown) may be formed on the surfaces of the electrodes 103 and 104. In this case, the lamp voltage can be lowered compared to a lamp not provided with an electron emissive material layer. Specifically, the electron-emitting material layer is formed on the inner surfaces of the electrodes 103 and 104, for example. The electron emissive material layer includes, for example, a rare earth element. This is because the cold cathode fluorescent lamp is effective in reducing the lamp voltage. Furthermore, the rare earth element is more preferably one or more of lanthanum (La) and yttrium (Y).

  The electron-emitting material layer may be any one of silicon (Si), aluminum (Al), zirconium (Zr), boron (B), zinc (Zn), bismuth (Bi), phosphorus (P), and tin (Sn). It is preferable that 1 or more types are included. In this case, the lamp voltage reduction effect can be further sustained.

Furthermore, a cesium (Cs) compound may be included in the electron-emitting material layer. In this case, the dark start characteristics of the lamp can be further improved. Further, as the electron-emitting material layer, a cesium compound may be attached to the inner surface or the outer surface of the electrodes 103, 104, or separately from the electron-emitting material layer, a cesium compound may be attached to the inner surface or the outer surface of the electrodes 103, 104. Also good. As the cesium compound, for example, it is preferable to use at least one of cesium sulfate, cesium aluminate, cesium niobate, cesium tungstate, cesium molybdate, and cesium chloride. The cesium compound is more preferably attached to the outer side surfaces of the electrodes 103 and 104. In this case, the cesium compound can be moderately activated easily in the manufacturing process of the cold cathode fluorescent lamp. Further, it is even more preferable that the electrodes 103 and 104 are attached to the front end portion on the lamp central portion side.
5. Glass bulb (1) The bulb 102 may have a thermal expansion coefficient in the range of 3.0 × 10 ⁻⁶ [K ⁻¹ ] to 10.0 × 10 ⁻⁶ [K ⁻¹ ]. In particular, the coefficient of thermal expansion of the valve 102 is preferably in the range of 8.0 × 10 ⁻⁶ [K ⁻¹ ] to 10.0 × 10 ⁻⁶ [K ⁻¹ ]. In this case, since the intensity | strength of glass becomes weak, the effect of this invention can be exhibited especially.

(2) Ultraviolet absorption The glass, which is the material of the bulb 102, can absorb ultraviolet rays of 254 [nm] and 313 [nm] by doping a transition metal oxide with a predetermined amount depending on the type. 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 20 [mol%], the glass may be devitrified, so 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.

(3) Infrared transmission coefficient The infrared transmission coefficient indicating the water content in the glass which is the material of the bulb 102 is in the range of 0.3 to 1.2, particularly in the range of 0.4 to 0.8. It is preferable to adjust so that. If the infrared transmittance coefficient is 1.2 or less, it is easy to obtain a low dielectric loss tangent applicable to a high voltage application lamp such as a long cold cathode fluorescent lamp, and if it is 0.8 or less, the dielectric loss tangent is sufficient. It becomes small and becomes applicable to a high voltage application lamp.

  The infrared transmittance coefficient (X) can be expressed by the following formula.

[Expression 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 (4) Lead-free glass The glass used for the bulb 102 has an oxide conversion of SiO ₂ of 60 wt% to 75 wt% and Al ₂ O ₃ of 1 wt% to 5 [Wt%], Li ₂ O is 0 [wt%] to 5 [wt%], K ₂ O is 3 [wt%] to 11 [wt%], and Na ₂ O is 3 [wt%] to 12 [wt]. %], CaO is 0 [wt%] to 9 [wt%], MgO is 0 [wt%] to 9 [wt%], SrO is 0 [wt%] to 12 [wt%], and BaO is 0 [wt]. %] To 12 [wt%]. In this case, an environment-friendly cold cathode discharge lamp that does not contain a lead component can be provided. Furthermore, the glass used for the bulb 102 is SiO _{2 in the range} of 60 [wt%] to 75 [wt]%, Al ₂ O _{3 in the range} of 1 [wt%] to 5 [wt%], and B ₂ O in terms of oxide. ₃ 0 [wt%] ~3 [wt %], Li 2 O is 0 [wt%] ~5 [wt %], K 2 O is 3 [wt%] ~11 [wt %], Na 2 O is 3 [wt%] to 12 [wt%], CaO from 0 [wt%] to 9 [wt%], MgO from 0 [wt%] to 9 [wt%], and SrO from 0 [wt%] to 12 [wt%] wt%] and BaO more preferably have a composition of 0 [wt%] to 12 [wt%].

In addition, the glass used for the bulb 102 is, in terms of oxide, SiO ₂ of 60 [wt%] to 75 [wt]%, Al ₂ O ₃ of 1 [wt%] to 5 [wt%], and Li ₂ O. 0.5 [wt%] to 5 [wt%], K ₂ O 3 [wt%] to 7 [wt%], Na ₂ O 5 [wt%] to 12 [wt%], and CaO 1 [ wt%]-7 [wt%], MgO 1 [wt%]-7 [wt%], SrO 0 [wt%]-5 [wt%], BaO 7 [wt%]-12 [wt%] It may have the composition of]. In this case, it is possible to provide an environment-friendly cold cathode fluorescent lamp that is easy to process into a lamp and does not contain a lead component.

Furthermore, the glass used for the bulb 102 is SiO _{2 in the range} of 65 [wt%] to 75 [wt]%, Al ₂ O _{3 in the range} of 1 [wt%] to 5 [wt%], and B ₂ O _{3 in} terms of oxide. There 0 [wt%] ~3 [wt %], Li 2 O is 0.5 [wt%] ~5 [wt %], K 2 O is 3 [wt%] ~7 [wt %], Na 2 O Is 5 [wt%] to 12 [wt%], CaO is 2 [wt%] to 7 [wt%], MgO is 2.1 [wt%] to 7 [wt%], and SrO is 0 [wt%]. -0.9 [wt%], BaO may have a composition of 7.1 [wt%] to 12 [wt%]. In this case, it does not contain a lead component, has an electrical insulating property suitable for lighting applications, and can prevent devitrification. Furthermore, the glass used for the bulb 102 is, in terms of oxide, SiO ₂ 65 [wt%] to 75 [wt]%, Al ₂ O ₃ 1 [wt%] to 3 [wt%], B ₂ O. ₃ 0 [wt%] ~3 [wt %], Li 2 O is 1 [wt%] ~3 [wt %], K 2 O is 3 [wt%] ~6 [wt %], Na 2 O is 7 [wt%] to 10 [wt%], CaO from 3 [wt%] to 6 [wt%], MgO from 3 [wt%] to 6 [wt%], and SrO from 0 [wt%] to 0. It is more preferable that 9 [wt%] and BaO have a composition of 7.1 to 10 [wt%].

(5) The shape of the valve The cross section cut substantially perpendicular to the tube axis of the valve 102 is not limited to a substantially circular shape, for example, a flat shape such as a track shape or a rounded round shape, or an elliptical shape. Also good.
6). Phosphor of phosphor layer (1) Ultraviolet absorption For example, in recent years, with the increase in size of liquid crystal color televisions, polycarbonate with 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 light having a wavelength of 313 [nm] may be used. The following phosphors absorb 313 [nm] ultraviolet rays.

(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), Europium activated 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) Etc.

(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)
· Active aluminate, cerium-magnesium with terbium ^{_{[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 ≦ x ≦ 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]) in green, BAM-G (absorbs 313 [nm]) in green, and YOX in red Alternatively, a phosphor of YVO (absorbs 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 rays almost leak out of the glass bulb. Can be prevented. Therefore, when the phosphor layer 101 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 excitation light emission while changing the wavelength of the phosphor, and the excitation wavelength and emission intensity are changed. The intensity of the excitation wavelength spectrum at 313 [nm] is defined as 80 [%] or more. 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. In the cathode fluorescent lamp, there is a demand for expansion of a reproducible chromaticity range.

  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 CIE1931 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 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 in addition to 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], and 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 the phosphor layer 101 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 triangles that can connect 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) When NTSC ratio is 100%, SCA is used as blue, BAM-G is used as green, and YOX is used as red (Example 3), NTSC ratio is 95%. The luminance can be improved by 10 [%] as compared with the above.

Note that the chromaticity coordinate values used for the evaluation here are measured in the state of a liquid crystal display device in which a lamp or the like is incorporated, so that the color reproduction range is around the above value depending on the combination with the color filter. there is a possibility.
7). Enclosed gas Noble gas may contain krypton. In this case, infrared radiation can be suppressed when the low-pressure discharge lamp is a cold cathode fluorescent lamp. Furthermore, it is preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 5 [mol%]. In this case, infrared radiation of the cold cathode fluorescent lamp can be suppressed without greatly changing the lamp voltage. For example, argon is in the range of 0 [mol%] to 9.5 [mol%], neon is in the range of 90 [mol%] to 95.5 [mol%], and krypton is 0.5 [mol%]. ] In the range of 5 [mol%] or less. Furthermore, it is more preferable that krypton is contained in the rare gas within a range of 0.5 [mol%] to 3 [mol%]. Furthermore, it is more preferable that krypton is contained in the rare gas within a range of 1 [mol%] to 3 [mol%].

  The present invention can be widely applied to fluorescent lamps, lighting devices, lighting device manufacturing methods, and display devices.

100, 111, 112, 113, 114, 115, 116 Fluorescent lamp 101 Phosphor layer 102 Bulb 103, 104 Electrode 105, 106 Lead wire 107 One power supply terminal 108 The other power supply terminal 107a, 108a Body part 107b, 108b Connection part 200 Illumination Device 300 Image Display Device

Claims (10)

A phosphor layer is formed on the inner surface, a substantially U-shaped or U-shaped bulb, electrodes provided inside both ends of the bulb, one end connected to the electrode and the other end In a fluorescent lamp having a lead wire led out of the bulb and a power supply terminal connected to the lead wire,
A fluorescent lamp characterized in that one power supply terminal and the other power supply terminal can be distinguished when viewed from a direction substantially perpendicular to a plane including the tube axis of the bulb. The fluorescent lamp according to claim 1, wherein the apparent shape of the one power supply terminal and the other power supply terminal are different. 3. The fluorescent lamp according to claim 1, wherein the one feeding terminal and the other feeding terminal have different circumferential directions. 4. The fluorescent lamp according to claim 3, wherein the direction of the circumferential direction between the one power supply terminal and the other power supply terminal is different within a range of 15 ° to 165 °. 5. 2. The fluorescent lamp according to claim 1, wherein positions of the one power supply terminal and the other power supply terminal are different in a longitudinal direction of the power supply terminal. The power supply terminal has a main body portion that covers an end portion of the bulb, a connection portion that extends from the main body portion and is connected to the lead wire,
The fluorescent lamp according to claim 1, wherein a shape of a connection portion between the one power supply terminal and the other power supply terminal is different. The power supply terminal has a main body portion that covers an end portion of the bulb, a connection portion that extends from the main body portion and is connected to the lead wire,
The main body is provided with a slit,
2. The fluorescent lamp according to claim 1, wherein the positions of the ends of the phosphor layers seen through the slits of the one power supply terminal and the other power supply terminal are different. An illuminating device comprising the fluorescent lamp according to claim 1. A step of discriminating between the one power supply terminal and the other power supply terminal of the fluorescent lamp according to any one of claims 1 to 7, and a step of installing the fluorescent lamp inside an illumination device. The manufacturing method of the illuminating device. An image display device comprising the illumination device according to claim 8.

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