JP2008235110A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp having a structure allowing a worker to easily identify the difference of a sealing-side end from an exhaust-side end at a glance without imparting a difference to electrical characteristics at both ends. <P>SOLUTION: This fluorescent lamp 10 is structured such that a phosphor layer 2 is formed on the inside surface of a lamp glass tube 1; a discharge medium 3 is enclosed in a discharge space in the lamp glass tube; internal electrodes 4 and 5 are installed in the respective insides at both ends of the lamp glass tube; to the respective internal electrodes, lead wires 6 and 7 penetrating sealing ends of the lamp glass tube from tube end-side end surfaces thereof, and led out to the outside are connected; current conductor layers 8 and 9 are formed on the respective outer peripheral surfaces at both ends of the lamp glass tube; and the current conductor layers and the internal electrodes are brought into an electrically-conducting state. A dimensional difference capable of being visually identified is provided to the lengths of the respective current conductor layers at both the ends of the lamp glass tube from the tube ends. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) with an external current conductor layer and an external electrode fluorescent lamp (EEFL).

  Conventionally, for example, as a cold cathode fluorescent lamp with an external current conductor, one described in Japanese Patent Laid-Open No. 09-17329 (Patent Document 1) is known. As an improved cold cathode fluorescent lamp, the one described in the specification and drawings of Japanese Patent Application No. 2006-116610, which is a patent application relating to the invention of the present inventors, has been proposed. The proposed cold cathode fluorescent lamp 100 with an external current conductor has a structure as shown in FIG. 5, and a phosphor film 102 is formed on the inner wall of a lamp glass tube 101, and a discharge medium 103 is provided in an internal discharge space. The internal electrodes 104 and 105 are installed inside the both ends of the lamp glass tube 101, and the other ends of the power supply leads 106 and 107 having one ends connected to the internal electrodes 104 and 105 are connected to the ends of the lamp glass tube 101, respectively. Each part is led out to the outside by substantially the same length (L6 = L7), and the current conductor layers 108 and 109 by solder dipping or ultrasonic solder dipping are provided on the outer peripheral surface and the end surface of both ends of the lamp glass tube 101 to have the same length (L8 = L9).

  Such a cold cathode fluorescent lamp 100 is employed as a light source of a liquid crystal backlight unit. In order to meet the demands for larger LCD screens in recent years, a large number of long cold cathode fluorescent lamps are arranged in parallel as the light source of the backlight unit to produce large-screen LCD TVs and LCDs. I use it. A single high-voltage inverter is used as a power source for such a backlight unit. In the case of a single high voltage inverter, it is necessary to strictly align the electrical characteristics of the electrodes of the fluorescent lamp on the side to which the high voltage is applied.

  In this type of fluorescent lamp, internal electrodes are installed at both ends of a long lance glass tube, a phosphor layer is applied and formed on the inner wall, and a discharge medium of mercury and a noble gas is provided in a predetermined amount at a predetermined pressure. In the manufacturing process, the inner electrode is installed at one end and the lead wire is led out, the end of the lamp glass tube is melt-sealed, and the inside is evacuated from the other end to discharge After the medium is sealed, and the internal electrode on the opposite side is installed, the medium is cut to an appropriate length and sealed. Therefore, as a long fluorescent lamp, the structure of both ends is not exactly the same shape, and it is inevitable that a slight difference occurs in both electrical characteristics and mechanical characteristics. For this reason, in backlight units that use a large number of cold-cathode fluorescent lamps arranged in parallel as a light source, it is necessary to mount them in the same orientation so that the sealing end and exhaust end are on the same side. There is.

However, due to the trend toward larger LCD screens, the fluorescent lamp for the backlight unit has also become longer, so the operator can determine the sealing side end and exhaust side end from slight differences in their shapes. Therefore, careful attention is required to align the directions on the same side, and it takes time.
JP 09-17329 A

  The present invention has been made in view of such a current technical problem, and does not give a difference in the electrical characteristics of both ends, and further, the operator can make a difference between the sealing side end and the exhaust side end. It is an object to provide a fluorescent lamp having a structure that can be easily identified at a glance.

  One feature of the present invention is that a phosphor layer is formed on an inner wall of a lamp glass tube, a discharge medium is sealed in a discharge space inside the lamp glass tube, and an internal electrode is formed inside each end portion of the lamp glass tube. And connecting the lead wires led out from the end of the tube glass tube through the sealed end of the tube glass tube to the inner electrode, and soldering to the outer peripheral surfaces of the both ends of the lamp glass tube. In a fluorescent lamp in which a current conductor layer is formed by dipping and the current conductor layer and the internal electrode are electrically connected to each other by the lead wire, the tubes of the current conductor layers at both ends of the lamp glass tube It is a fluorescent lamp in which a dimensional difference that can be visually recognized is provided in the length from the end.

  Another feature of the present invention is that a phosphor layer is formed on the inner wall of the lamp glass tube, a discharge medium is sealed in a discharge space inside the lamp glass tube, and an internal electrode is provided inside each end of the lamp glass tube. And connecting the lead wires led out from the end of the tube glass tube through the sealed end of the tube glass tube to the inner electrode, and soldering to the outer peripheral surfaces of the both ends of the lamp glass tube. A fluorescent lamp in which a current conductor layer is formed by dipping and the current conductor layer and the internal electrode are electrically connected by the lead wire, and is led out from both ends of the lamp glass tube to the outside. In this fluorescent lamp, the protruding length of the lead wire is provided with a dimensional difference that can be visually recognized at both ends.

  Still another feature of the present invention is that a phosphor layer is formed on the inner wall of the lamp glass tube, a discharge medium is enclosed in a discharge space inside the lamp glass tube, and the outer peripheral surfaces of both end portions of the lamp glass tube are provided. A fluorescent lamp that has been subjected to blasting and has a current conductor layer formed on both ends of the blasted surface by solder dipping having the same shape, and protrudes from the current conductor layer of the blasted surface toward the center of the lamp glass tube. The fluorescent lamp is provided with a dimensional difference that can be visually identified at both ends.

  According to the fluorescent lamp of the present invention, even if the lamp glass tube is long, it depends on whether the current conductor layer at the sealing end is long or short, or the blasted surface is long or short, or protrudes easily. By making a glance at whether the protruding length of the lead wire is long or short, the operator can determine whether the sealing end is the sealing side end or the exhaust side end. It becomes easy to mount a large number of units in the unit with their sealing side end and exhaust side end aligned in the same direction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  (First Embodiment) FIG. 1 shows a cold cathode fluorescent lamp 10 according to a first embodiment of the present invention. In the cold cathode fluorescent lamp 10 of the present embodiment, a phosphor film 2 is formed on the inner wall of a long lamp glass tube 1, and a discharge medium 3 of mercury and a rare gas is enclosed in the internal discharge space. The internal electrodes 4 and 5 are installed inside both ends of the lamp, and the other ends of the power supply lead wires 6 and 7 having one end connected to each of the internal electrodes 4 and 5 have the same length from the end face portions of the lamp glass tube 1 to the outside. (L6 = L7) is derived, and current conductor layers 8 and 9 are formed by solder dipping or ultrasonic solder dipping on the outer peripheral surface and end face of both ends of the lamp glass tube 1, and the current conductor layers 8 and 9 The internal electrodes 4 and 5 are electrically connected by lead wires 6 and 7.

  In the present embodiment, in the cold cathode fluorescent lamp 10 having such a structure, the lengths L8 and L9 from the tube ends of the current conductor layers 8 and 9 at both ends of the lamp glass tube 1 are visually identified. There are dimensional differences that can be made. For example, the current conductor layer 8 at the exhaust side end is lengthened, and the current conductor layer 9 at the seal side end is shortened (L8> L9). The length may be reversed (L8 <L9). However, in the manufacturing process, the exhaust side end is uniformly lengthened and the sealing side end is shortened, or conversely, the exhaust side end is uniformly shortened and the sealing side end is lengthened.

  For example, when the lamp tube diameter is φ1.0 to 4.0 mm and the lamp length is 100 mm to 1600 mm, the length L8 of the current conductor layer 8 at the exhaust side end portion is set to 10 mm to 12 mm. In order to provide a dimensional difference of about 2 mm that can distinguish the difference in length, the length of the current conductor layer 9 at the sealing side end is shorter than that, and L9 = 8-10 mm. FIG. 2 is a graph showing the result of measuring the relationship between the length of the current conductor layers 8 and 9 and the total luminous flux that can be extracted with respect to the lamp length of 1000 mm. From this graph, when the length of the current conductor layers 8 and 9 formed by solder dipping exceeds 10 mm at both ends, the total luminous flux starts to decrease. Therefore, the dimensional difference between the lengths L8 and L9 of the current conductor layers 8 and 9 may be larger than 2 mm. However, the current conductor layers 8 and 9 inhibit the emission of light at the lamp end and shorten the lamp effective length. Stop the length so that it won't go wrong.

  According to the cold cathode fluorescent lamp 10 of the present embodiment, by forming a dimensional difference that can be discriminated by visually observing the length of the current conductor layers 8 and 9 formed on the outer peripheral surfaces of both ends of the lamp glass tube 1. The operator can easily identify which end portion is the sealing side end portion or the exhaust side end portion, and a large number of cold cathode fluorescent lamps 10 are oriented in parallel with the electrode portion of the backlight unit. Can be mounted without fail in a short time, and also when the sealing side end or the exhaust side end of the fluorescent lamp 10 needs to be connected to the high voltage output side of the inverter. , You can definitely connect them in the correct orientation.

  (Second Embodiment) A cold cathode fluorescent lamp 11 according to a second embodiment of the present invention will be described with reference to FIG. The cold cathode fluorescent lamp 11 of the present embodiment is characterized in that a difference is provided in the lengths L8 and L9 of the current conductor layers 8 and 9, and a difference is also provided in the lead-out lengths L6 and L7 of the lead wires 6 and 7. To do. In FIG. 3, common reference numerals are used for elements common to FIG.

  That is, in the cold cathode fluorescent lamp 11 of the present embodiment, the phosphor film 2 is formed on the inner wall of the long lamp glass tube 1, the discharge medium 3 of mercury and rare gas is enclosed in the internal discharge space, and the lamp glass Internal electrodes 4 and 5 are installed inside both ends of the tube 1, and the other ends of the power supply lead wires 6 and 7, one end of which is connected to each of the internal electrodes 4 and 5, are led out from the end surface portions of the lamp glass tube 1 to the outside. Further, the current conductor layers 8 and 9 are formed on the outer peripheral surface and the end surface of both ends of the lamp glass tube 1 by solder dipping or ultrasonic solder dipping, and the current conductor layers 8 and 9 and the internal electrodes 4 and 5 are connected. The lead wires 6 and 7 are electrically connected.

  In the present embodiment, in the cold cathode fluorescent lamp 11 having such a structure, the lengths L8 and L9 from the tube ends of the current conductor layers 8 and 9 at both ends of the lamp glass tube 1 are visually identified. Provide dimensional difference (L8> L9) that can be made, and easily identify the protruding lengths L6 and L7 of the lead wires 6 and 7 led out from both ends of the lamp glass tube 1 by visual inspection at both ends. A possible dimensional difference is provided (L6 = 0, L7 = 2 to 3 mm).

  The lengths L8 and L9 and the dimensional differences of the current conductor layers 8 and 9 are the same as those in the first embodiment. Then, regarding the difference in the protruding lengths L6 and L7 of the lead wires 6 and 7 from the lamp tube end, the lead wire 6 at the exhaust side end portion is L6 = 0, and the lead wire 7 at the sealing side end portion is L7 = 2. ˜3 mm. In this way, the operator can easily identify the exhaust side end portion and the sealing side end portion depending on whether the lead wire protrudes or does not protrude.

  According to the present embodiment, as in the first embodiment, the exhaust-side end portion and the sealing-side end portion of the fluorescent lamp 11 are visually checked by the difference in the lengths L8 and L9 of the current conductor layers 8 and 9. It is possible to easily identify by simply doing a glance at the exhaust side end portion and the sealing side end portion of the fluorescent lamp 11 depending on whether the lead wires 6 and 7 are projected or not. The same effect as the first embodiment can be obtained.

  In addition, about the projecting lengths L6 and L7 of the lead wires 6 and 7, when it is necessary to project both at both ends of the lamp glass tube 1, a difference of about 2 mm to 3 mm is given to the projecting length, and L7-L6. By setting it to = 2 to 3 mm, it is possible to make the operator identify whether the protrusion length is long or short. In the case of this embodiment, the exhaust side end portion and the sealing side end portion can be easily provided to the operator by whether the lead wires 6 and 7 are not protruded or the protrusion length is longer or shorter. Therefore, the current conductor layers 8 and 9 may have the same length.

  (Third Embodiment) A cold cathode fluorescent lamp 12 according to a third embodiment of the present invention will be described with reference to FIG. In the cold cathode fluorescent lamp 12 of the present embodiment, the current conductor layers 8 and 9 are formed on the outer peripheral surfaces of both ends of the lamp glass tube 1 by forming the current conductor layers 8 and 9 by solder dipping or ultrasonic solder dipping. First, the end surface of the lamp glass tube 1 is blasted, and the current conductor layers 8 and 9 are formed on the blasted surfaces 15 and 16 so that the current conductor layers 8 and 9 are firmly attached to the surface of the lamp glass tube 1. I am doing so. In the case of the present embodiment, a difference is provided in the lengths L8, L9 of the current conductor layers 8, 9, a difference is also provided in the projecting lengths L6, L7 of the lead wires 6, 7, and this blasted surface 15 , 16 also has a difference in exposure length. In FIG. 4, common reference numerals are used for elements common to FIGS. 1 and 3.

  That is, in the cold cathode fluorescent lamp 12 of the present embodiment, the phosphor film 2 is formed on the inner wall of the long lamp glass tube 1, the discharge medium 3 of mercury and a rare gas is enclosed in the internal discharge space, and the lamp glass Internal electrodes 4 and 5 are installed inside both ends of the tube 1, and the other ends of the power supply lead wires 6 and 7, one end of which is connected to each of the internal electrodes 4 and 5, are led out from the end surface portions of the lamp glass tube 1 to the outside. Furthermore, the end surface of the lamp glass tube 1 is blasted, and the current conductor layer 8 is applied to the blasted surfaces 15 and 16 by solder dipping or ultrasonic solder dipping on the outer peripheral surfaces and end surfaces of both ends of the lamp glass tube 1. , 9 to electrically connect the current conductor layers 8, 9 and the internal electrodes 4, 5 with lead wires 6, 7.

  In the present embodiment, in the cold cathode fluorescent lamp 12 having such a structure, the lengths L8 and L9 from the tube ends of the current conductor layers 8 and 9 at both ends of the lamp glass tube 1 can be visually identified. A dimensional difference is provided (L8−L9 = 2 to 3 mm), and the protruding lengths L6 and L7 of the lead wires 8 and 9 led to the outside from both ends of the lamp glass tube 1 can be easily identified by visual observation. A dimensional difference is provided (L7−L6 = 2 to 3 mm), and the exposed lengths L15 and L16 of the blasting surfaces 15 and 16 exposed without forming the current conductor layers 8 and 9 are easily glanced at visually. Are provided with dimensional differences (L15−L8 = 0, L16−L9 = 2 to 3 mm). In this embodiment, the lengths of the blasting surfaces 15 and 16 are made equal (L15 = L16), and the lengths L8 and L9 of the current conductor layers 8 and 9 formed thereon are blasted on the exhaust side. It is the same length as the surface 15 (L8 = L15), and it is 2-3 mm shorter than the blasting surface 16 on the sealing side, and L16−L9 = 2 to 3 mm, so that a part of the blasting surface 16 on the sealing side Is exposed.

  As with the first and second embodiments, the lengths L8 and L9 of the current conductor layers 8 and 9 and their dimensional differences and the differences between the projecting lengths L6 and L7 of the lead wires 6 and 7 from the lamp tube end are the same. Can be set. In the case of the present embodiment, the length L8 of the current conductor layer 8 is made equal to the length L15 of the blasting surface 15, so that the exposed length of the blasting surface 15 is zero at the exhaust side end, and the current conductor The length L9 of the layer 9 is 2 to 3 mm shorter than the length L16 of the blasting surface 16 so that the blasting surface 15 is not exposed and the other blasting surface 16 is exposed. The operator is not exposed to the difference between the lengths L8 and L9 of the current conductor layers 8 and 9, the difference between the protruding lengths L6 and L7 of the lead wires 6 and 7, and the blasted surfaces 15 and 16 are exposed. Therefore, the exhaust side end and the sealing side end can be easily identified.

  According to the present embodiment, the lead wires 6 and 7 protrude due to the difference in the length of the current conductor layers 8 and 9 as in the first embodiment, and as in the second embodiment. It can be easily identified by just looking at the exhaust side end portion and the sealing side end portion of the fluorescent lamp 11 according to the difference in protrusion length, and in addition, the blasting surface is not exposed. Also, the exhaust side end portion and the sealing side end portion of the fluorescent lamp 11 can be easily identified visually.

  In addition, about the exposure length of the blast processing surfaces 15 and 16, when it is necessary to expose both the both ends of the lamp glass tube 1, it gives an operator about a difference of about 2-3 mm in the exposure length. It is also possible to identify whether the exposure length is long or short. In the case of the present embodiment, the exhaust side end and the sealing side end can be easily identified to the operator by whether the blasted surface is exposed or the exposed length is longer or shorter. Therefore, the protruding lengths of the lead wires 6 and 7 may be equal.

  Furthermore, in the above embodiment, the blasting surfaces 15 and 16 are made equal in length, and the exposed length of the blasting surfaces 15 and 16 varies depending on the difference in length on the current conductor layers 8 and 9 side. Instead, the lengths of the current conductor layers 8 and 9 are made equal, and the blasted surfaces 15 and 16 are made the same length as the current conductor layers 8 and 9 at one end and are made 2 to 3 mm longer than that at the other end. Similarly, the exhaust side end and the sealing side end can be easily identified depending on whether or not the blasted surface is exposed. In addition, the blasted surfaces 15 and 16 at both ends are longer than the current conductor layers 8 and 9 so as to be exposed together, and the exposed length is different at both ends. , 16 may vary in length by 2 to 3 mm.

  In addition, in the present embodiment, the application to the cold cathode fluorescent lamp (CCFL) has been described, but the present embodiment can also be applied to the external electrode fluorescent lamp (EEFL) having no internal electrode. . In that case, the length of the blasting surface provided on the outer periphery of both ends of the lamp glass tube is made different so that the exposed length is made different at both ends of the lamp glass tube, and whether the blasting surface is exposed or not. The operator can easily identify the exhaust-side end portion and the sealing-side end portion depending on whether the exposed length is longer or shorter.

1 is a cross-sectional view of a cold cathode fluorescent lamp according to a first embodiment of the present invention. In the said embodiment, the graph which shows the change of the total light beam of a fluorescent lamp when the length of a current conductor layer is changed. Sectional drawing of the cold cathode fluorescent lamp of the 2nd Embodiment of this invention. Sectional drawing of the cold cathode fluorescent lamp of the 3rd Embodiment of this invention. Sectional drawing of the cold cathode fluorescent lamp of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lamp glass tube 2 Phosphor layer 3 Discharge medium 4,5 Internal electrode 6,7 Lead wire 8,9 Current conductor layer 10,11,12 Cold cathode fluorescent lamp 15,16 Blast processing surface

Claims (3)

A phosphor layer is formed on the inner wall of the lamp glass tube, a discharge medium is enclosed in a discharge space inside the lamp glass tube, an internal electrode is installed inside each end of the lamp glass tube, and each of the internal electrodes Further, a lead wire passing through the sealed end of the lamp glass tube from the end surface on the tube end side and connected to the outside is connected, and a current conductor layer is formed on each outer peripheral surface of the lamp glass tube by solder dipping. In the fluorescent lamp in which the current conductor layer and the internal electrode are electrically connected by the lead wire,
A fluorescent lamp characterized in that a dimensional difference that can be visually identified is provided in the length from the tube end of each of the current conductor layers at both ends of the lamp glass tube. A phosphor layer is formed on the inner wall of the lamp glass tube, a discharge medium is enclosed in a discharge space inside the lamp glass tube, an internal electrode is installed inside each end of the lamp glass tube, and each of the internal electrodes Further, a lead wire passing through the sealed end of the lamp glass tube from the end surface on the tube end side and connected to the outside is connected, and a current conductor layer is formed on each outer peripheral surface of the lamp glass tube by solder dipping. In the fluorescent lamp in which the current conductor layer and the internal electrode are electrically connected by the lead wire,
A fluorescent lamp characterized in that a projecting length of a lead wire led out from both ends of the lamp glass tube is provided with a dimensional difference that can be visually recognized at both ends. A phosphor layer is formed on the inner wall of the lamp glass tube, a discharge medium is sealed in a discharge space inside the lamp glass tube, and the outer peripheral surfaces of both end portions of the lamp glass tube are subjected to blasting, and the blasted surface In each fluorescent lamp in which current conductor layers are formed by solder dipping of the same shape at both ends,
A fluorescent lamp characterized in that a dimension difference that can be visually recognized at both ends is provided in a dimension that protrudes from the current conductor layer of the blasted surface toward the center of the lamp glass tube.

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