JP5000372B2 - Fluorescent lamp and lighting device using the same - Google Patents

Description

  The present invention relates to a fluorescent lamp including a base and a fluorescent tube fixedly held on the base, and an illumination device using the fluorescent lamp.

  Normally, it is known that when the fluorescent lamp reaches the end of its life, the temperature of the electrode sealing portion at the end of the fluorescent tube may rise excessively. That is, at the end of the life of the fluorescent lamp, when the electron emitting material fixed to the electrode filament is completely scattered, the cathode fall voltage rises and the power consumption at the electrode increases. The rise is excessive. Such a temperature rise at the end of the life is a so-called two bulbs having one end connected in parallel and an electrode sealing portion provided at the other end of the bulb fixed to the base. This is particularly a problem with twin fluorescent lamps. In the twin type fluorescent lamp, since the electrode sealing portion is surrounded by a resin base, heat dissipation is low, the temperature of the base is excessively increased, and the base may be thermally deformed.

  In order to prevent such heat generation and temperature rise at the end of the fluorescent tube at the end of the lifetime, a fluorescent lamp in which a temperature protection element having a thermal fuse or the like is connected to the external lead wire of the fluorescent lamp has been proposed (for example, (See Patent Document 1 and Patent Document 2.) As a result, the temperature fuse can be blown by the heat generated at the end of the fluorescent tube at the end of the lifetime, and the lighting circuit can be shut off.

FIG. 9 is a plan view A of a base used in a conventional fluorescent lamp equipped with a temperature protection element, and a sectional view B of the IV-IV line. In FIG. 9A, in order to make it easy to identify the height difference of each plane portion, a part of the dots is added. In FIG. 9, a base 100 includes fluorescent tube storage portions 101 and 102 that are formed in a substantially circular shape for storing fluorescent tubes, and temperature protection element storage portions 105 and 106 that store temperature protection elements 103 and 104. I have. The base 100 is formed in an oval shape in plan view, and is formed of curved outer walls 107a and 107b and planar outer walls 107c and 107d. Further, the fluorescent tube storage portions 101 and 102 are separated by a partition wall 108. The temperature protection element 103 is fixed in the temperature protection element storage part 105 by support members 109 and 110, and the temperature protection element 104 is fixed in the temperature protection element storage part 106 by support members 111 and 112.
Japanese Patent Laid-Open No. 11-111231 (Japanese Patent No. 3844556) JP 2000-30664 A (Patent No. 30325504)

  However, in the above-described conventional base, since the fluorescent tube storage portion for storing the two electrode sealing portions of the fluorescent tube is separated by the partition wall, an adhesive is used to fix the fluorescent tube to the fluorescent tube storage portion. When injecting the agent, the adhesive must be injected into each of the two fluorescent tube storage units, which is complicated in the manufacturing process. In addition, when the fluorescent tube housing portion is separated by the partition wall, when stress is applied to the fluorescent tube and the temperature protection element by the thermally expanded adhesive when the adhesive is cured by heating, the stress escape space is provided. Otherwise, the fluorescent tube may be damaged or the temperature protection element may be deformed. Furthermore, if the fluorescent tube storage part is separated by the partition wall, the heat conduction between the fluorescent tube storage parts is hindered. Therefore, the temperature protection elements respectively arranged on both sides of the partition wall have one fluorescent tube adjacent thereto. Only the temperature at the end can be detected, and the safety of the fluorescent lamp is reduced when one of the temperature protection elements fails.

  The present invention solves the above problems, and provides a fluorescent lamp that has high productivity and can reliably detect the heat generation / temperature rise of the fluorescent tube at the end of its life, and further uses the fluorescent lamp. A highly safe lighting device is provided.

  The fluorescent lamp of the present invention is a fluorescent lamp comprising a base, a fluorescent tube fixedly held on the base, and a temperature protection element. The fluorescent tube has an electrode seal in which electrodes are sealed at both ends. A stopper is provided, and a discharge path is bent inside, and the base is used to store a fluorescent tube storage portion for storing the electrode sealing portion of the fluorescent tube and the temperature protection element. The fluorescent tube storage portion is formed of an outer wall of the base and two protruding pieces protruding from the outer wall so as to contact the outer periphery of the fluorescent tube, and the temperature protection element A storage part is formed from the outer wall and one of the protruding pieces, the electrode sealing part is provided in the fluorescent tube storage part, and the temperature protection element is provided in the temperature protection element storage part. The electrode is connected to the temperature protection element. The features.

  Moreover, the illuminating device of this invention is equipped with the fluorescent lamp of the said invention, It is characterized by the above-mentioned.

  The fluorescent lamp of the present invention is highly productive and can reliably detect the heat generation / temperature rise of the fluorescent tube at the end of its life. Moreover, since the illuminating device of this invention uses the fluorescent lamp of the said invention, high safety | security can be ensured.

  The fluorescent lamp of the present invention includes a base and a fluorescent tube fixedly held on the base. The base and the fluorescent tube are preferably fixed with an adhesive. Thereby, the fluorescent tube can be securely fixed to the base.

  The fluorescent tube has an electrode sealing portion in which electrodes are sealed at both ends, and has a discharge path bent inside.

  The base includes a fluorescent tube storage portion for storing two electrode sealing portions of the fluorescent tube, and two temperature protection element storage portions for storing temperature protection elements.

  The fluorescent tube housing part is formed by an outer wall of the base and two projecting pieces projecting from the outer wall so as to come into contact with the outer periphery of the fluorescent tube, and an electrode sealing part is disposed in the fluorescent tube housing part. . Thereby, since a gap is formed between the tip portions of the two protruding pieces, the entire fluorescent tube housing portion can be filled with the adhesive simply by injecting the adhesive from one place of the fluorescent tube housing portion. And the manufacturing process can be simplified. In addition, when the adhesive is cured by heating, even if the adhesive is thermally expanded, the stress caused by the thermally expanded adhesive can be dispersed by the gaps in the fluorescent tube housing portion. No deformation or the like occurs. In addition, since the adhesive filled in the gap connects the electrode sealing portion, the heat generation of one electrode sealing portion can be detected by both temperature protection elements, and if one temperature protection element is Even when it does not operate, the other temperature protection element can be reliably operated.

  The temperature protection element storage portion is formed from the outer wall and one of the protruding pieces, and the temperature protection element storage portion is provided with a temperature protection element. As a result, the temperature protection element can be disposed in the vicinity of the electrode sealing portion, which is a heat generating portion. Therefore, the temperature protection element quickly detects the temperature rise of the electrode sealing portion that occurs at the end of the life, and promptly shuts down the circuit. be able to. Further, the temperature protection element can be protected from the stress caused by the thermally expanded adhesive by the elastic force of the protruding piece.

  The electrode is connected to a temperature protection element. As a result, the heat generation at the end of the fluorescent tube at the end of the life can activate the temperature protection element to shut off the lighting circuit, and the heat generation and temperature rise of the fluorescent tube at the end of the life can be reliably prevented.

  More specifically, the base is formed in an oval shape when viewed from the fluorescent tube storage portion side, and one of the projecting pieces is oblique to one linear portion of the oval shape when viewed from the fluorescent tube storage portion side. The other of the protruding pieces protrudes obliquely with respect to the other oval straight line portion when viewed from the fluorescent tube housing portion side, and the two protruding pieces are arranged in parallel to each other when viewed from the fluorescent tube housing portion side. Has been.

  Further, a supporting piece having a predetermined distance from the protruding piece can be further provided between the tip ends of the two protruding pieces. Thus, the fluorescent tube can be securely fixed and held by the base while substantially ensuring a gap between the tip portions of the two protruding pieces. That is, when an external force is applied to the bulb, the bulb tries to move in the fluorescent tube housing portion of the base. However, if a support piece exists between the two bulbs, the contact area between the base and the adhesive increases and adhesion occurs. The force increases, the movement of the bulb can be prevented, the strength against damage caused by an external force can be increased, and a short circuit between the fluorescent tubes can be prevented.

  In addition, a support column having a predetermined distance from the protruding piece may be further provided between the tip ends of the two protruding pieces. Thereby, the effect similar to the said support piece is exhibited, Furthermore, the intensity | strength of a support pillar improves by making a support piece into a support pillar, and the movement of a valve | bulb can be prevented more reliably.

  In addition, it is preferable that a space exists in the temperature protection element storage portion, and it is particularly preferable that a space exist on the outer wall side of the base. That is, it is preferable not to fill the temperature protection element housing portion with an adhesive. By providing a space in the temperature protection element housing, even if the temperature protection element receives stress due to thermal expansion of the adhesive, the temperature protection element can move in the space according to the stress. This is because the stress due to the adhesive that is generated during thermal expansion can be absorbed.

  Moreover, the illuminating device of this invention was equipped with the fluorescent lamp of the said invention. Thereby, the safety | security of an illuminating device can be improved reliably.

(Embodiment 1)
Hereinafter, embodiments of the fluorescent lamp of the present invention will be described with reference to the drawings. In the following drawings, the same portions are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a front view showing an example of the fluorescent lamp of the present invention. In FIG. 1, the fluorescent lamp 10 includes a base 11 and a fluorescent tube 12 fixedly held on the base 11. The fluorescent tube 12 is formed by arranging two straight tubular bulbs 12a and 12b, which are sealed at one end, in parallel, and the ends of the bulbs 12a and 12b on the sealed side are formed by a bridge connecting portion 13. The discharge paths are connected in communication with each other and bent inside. The base 11 is made of a synthetic resin such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT). The bulbs 12a and 12b are formed from glass tubes. The fluorescent tube 12 can also be formed from a U-shaped glass tube.

  FIG. 2 is a schematic view of the main part of the fluorescent tube 12. In FIG. 2, a rare gas such as argon and mercury are sealed inside the fluorescent tube 12, and stems 16 and 17 holding the electrodes 14 and 15 are sealed at the other ends of the bulbs 12a and 12b. Electrode sealing portions 18 and 19 are formed adjacent to each other. The space | interval of the electrode sealing parts 18 and 19 should just be 1-5 mm, and is 2 mm in the below-mentioned Example. In addition, lead wires 20, 21, 22, and 23 are passed through the stems 16 and 17, respectively, and the electrodes 14 and 15 are installed on the lead wires 20, 21, 22, and 23, respectively. . As a result, the discharge path of the fluorescent tube 12 is, for example, electrode 14 → bulb 12a → bridge connection 13 → bulb 12b → electrode 15, and the discharge is formed over the entire length of the fluorescent tube 12.

  The lead wires 21 and 22 are connected to terminals 24 and 25 of the base 11 shown in FIG. The lead wires 20 and 23 are connected to lead wires 26a and 27a at one ends of the temperature protection elements 26 and 27 by welding. Lead wires 26b and 27b at the other ends of the temperature protection elements 26 and 27 are connected to terminals 28 and 29 of the base 11 shown in FIG.

  FIG. 3 is a plan view A of the base 11 and a cross-sectional view B of the II line. In FIG. 3A, in order to make it easy to identify the height difference of each plane portion, a part of the dots is added. The same applies to FIGS. 4A and 5A described later. 3A, L indicates the length of the base 11 and W indicates the width thereof.

  In FIG. 3, the base 11 includes fluorescent tube storage portions 30 and 31 formed in a substantially circular shape for inserting and storing the electrode sealing portions 18 and 19 of the fluorescent tube 12, and the fluorescent tube storage portion 30, Temperature protection element storage portions 32 and 33 for storing the temperature protection elements 26 and 27 provided so as to be close to 31. The base 11 is formed in an oval shape in plan view, and has curved outer walls 34a and 34b and planar outer walls 34c and 34d.

  The fluorescent tube storage unit 30 is in a space substantially surrounded by an outer wall 34a and a protruding piece 36 that protrudes from the boundary position between the outer wall 34a and the outer wall 34d into the base so as to contact the outer periphery of the fluorescent tube 12 described above. The fluorescent tube storage portion 31 is formed in a space substantially surrounded by the outer wall 34b and the protruding piece 35 protruding so as to contact the outer periphery of the fluorescent tube 12 from the boundary position between the outer wall 34b and the outer wall 34c. ing. The thickness of the protruding pieces 35 and 36 may be 0.5 to 3 mm. If the thickness is less than 0.5 mm, the strength is small and the temperature protection elements 26 and 27 cannot be sufficiently protected.

  The temperature protection element storage portion 32 is formed of an outer wall 34 c and a protruding piece 35, and the temperature protection element storage portion 33 is formed of an outer wall 34 d and a protrusion piece 36. The protruding pieces 35 and 36 are arranged in parallel in a plan view.

  Temperature protection elements 26 and 27 are arranged in the temperature protection element storage portions 32 and 33. The temperature protection element 26 is fixed in the temperature protection element storage portion 32 by support members 37 and 38, and the temperature protection element 27 is fixed in the temperature protection element storage portion 33 by support members 39 and 40. The lead wire 26 b of the temperature protection element 26 is connected to the terminal 28, and the lead wire 27 b of the temperature protection element 27 is connected to the terminal 29.

  As is clear from FIG. 3, since a gap 46 is formed between the tip portions of the protruding pieces 35 and 36, the fluorescent tube storage portions 30 and 31 communicate with each other via the gap 46. By simply injecting the adhesive from any one of 30 and 31, the entire fluorescent tube housing can be filled with the adhesive, and the manufacturing process can be simplified. Further, when the adhesive is cured by heating, even if the adhesive is thermally expanded, the stress caused by the thermally expanded adhesive can be dispersed by the gap 46 between the fluorescent tube storage portions 30 and 31. Are not damaged and the temperature protection elements 26 and 27 are not deformed. Furthermore, the gap 46 improves the thermal conductivity between the fluorescent tube storage portions 30 and 31, and the heat generation of one of the electrode sealing portions 18 or 19 can be detected by both the temperature protection elements 26 and 27. Even if the temperature protection element 26 or 27 does not operate for some reason, the other temperature protection element 26 or 27 can be reliably operated.

  Further, in the base 11 shown in FIG. 3, since the temperature protection elements 26 and 27 can be arranged in the vicinity of the fluorescent tube storage portions 30 and 31 in which the electrode sealing portions 18 and 19 which are heat generating portions are stored, Nos. 26 and 27 can quickly detect the temperature rise of the electrode sealing portions 18 and 19 that occurs at the end of the lifetime, and can quickly cut off the circuit.

  FIG. 4 is a plan view A showing another form of the base 11 and a cross-sectional view B taken along the line II-II. The base 11 shown in FIG. 4 has the same configuration as the base 11 shown in FIG. 3 except that support pieces 41 each having a predetermined distance from the protruding pieces 35 and 36 are provided between the tip portions of the protruding pieces 35 and 36. It is. As a result, the fluorescent tube 12 can be reliably fixed and held by the base 11 while substantially ensuring a gap 46 between the tip portions of the protruding pieces 35 and 36. Further, the fluorescent tube storage portions 30 and 31 communicate with each other through a gap 46.

  FIG. 5 is a plan view A showing still another embodiment of the base 11 and a cross-sectional view B taken along the line III-III. The base 11 shown in FIG. 5 has the same configuration as the base 11 shown in FIG. 3 except that support pillars 42 each having a predetermined distance from the protruding pieces 35 and 36 are provided between the tips of the protruding pieces 35 and 36. It is. Thus, the fluorescent tube 12 can be more securely fixed and held to the base 11 while substantially ensuring a gap 46 between the tip portions of the protruding pieces 35 and 36. Further, the fluorescent tube storage portions 30 and 31 communicate with each other through a gap 46.

  Next, an example of the manufacturing method of the fluorescent lamp of the present embodiment will be described.

  First, as shown in FIG. 6, in the temperature protection element storage portions 32 and 33 of the base 11, the temperature protection element 26 having lead wires 26a and 26b and the temperature protection element 27 having lead wires 27a and 27b are stored. The lead wires 26 b and 27 b of the temperature protection elements 26 and 27 are connected to the terminals 28 and 29 of the base 11.

  Next, an adhesive is injected into one of the fluorescent tube storage units 30 and 31. The injected adhesive spreads through the gaps 46 between the projecting pieces 35 and 36 of the base 11 and reaches the entire fluorescent tube storage units 30 and 31. As the adhesive, a resin material such as a silicone resin and an epoxy resin, or a cement material such as Portland cement can be used.

  Next, as shown in FIG. 2, the lead wires 21 and 22 of the fluorescent tube 12 are passed through the terminals 24 and 25 of the base 11, and further, as shown in FIG. , 31. As a result, the adhesive 43 is filled in the gap between the fluorescent tube 12 and the base 11. However, between the fluorescent tube storage unit 30 and the temperature protection element storage unit 32, the temperature protection element 26 is fixed by support members 37 and 38, and between the fluorescent tube storage unit 31 and the temperature protection element storage unit 33. Since the temperature protection element 27 is fixed by the support members 39 and 40, the adhesive hardly flows into the temperature protection element storage portions 32 and 33. Thereby, space can exist in the temperature protection element accommodating parts 32 and 33, and the stress which generate | occur | produces when an adhesive agent hardens | cures and thermally expands can be absorbed. In this state, the base 11 and the fluorescent tube 12 are heated in an electric furnace to cure the adhesive, thereby fixing the base 11 and the fluorescent tube 12.

  In the above embodiment, the example in which the fluorescent tube 12 is inserted after injecting the adhesive into the fluorescent tube storage units 30 and 31 is shown. However, after the fluorescent tube 12 is inserted into the fluorescent tube storage units 30 and 31, the fluorescent tube 12 is inserted. An adhesive may be injected from the gap between the base 11 and the base 11. Even in this case, the injected adhesive passes through between the protruding pieces 35 and 36 of the base 11 and spreads over the entire fluorescent tube storage portions 30 and 31.

  Next, the lead wires 20 and 23 of the fluorescent tube 12 and the lead wires 26a and 27a of the temperature protection elements 26 and 27 are connected by welding or the like. Subsequently, the connected portions are accommodated in the temperature protection element accommodating portions 32 and 33, and then the temperature protection element accommodating portion 32 is provided by the lids 44 and 45 having a resin material (adhesive) such as silicone resin attached to the back surface. , 33 is closed. Thereby, the fluorescent lamp of this embodiment is completed.

(Embodiment 2)
Next, an embodiment of the illumination device of the present invention will be described. FIG. 8 is a perspective view showing an example of the illumination device of the present invention. In FIG. 8, the illumination device 50 includes a fluorescent lamp 51. As the fluorescent lamp 51, the fluorescent lamp described in the first embodiment is used as it is. By using the fluorescent lamp 51 of the first embodiment, the safety of the lighting device 50 at the end of its life can be improved.

  Next, this invention is demonstrated based on an Example.

Example 1
As a fluorescent lamp similar to the fluorescent lamp shown in FIGS. 1 to 3, a fluorescent tube 12 having a total length of 410 mm formed by bridge-connecting bulbs 12a and 12b having a tube outer diameter of 20 mm, and a length (L) made of PBT resin. A fluorescent lamp with a rating of 200 V and 36 W composed of a base 11 having a width of 47 mm and a width (W) of 25 mm was produced. As the temperature protection elements 26 and 27, those having a fusing temperature near 140 ° C. were used. The shortest distance between the temperature protection elements 26 and 27 and the electrode sealing portions 18 and 19 was 2 mm. For joining the base 11 to the fluorescent tube 12 and the lids 44 and 45, silicone resin was used, and the temperature protection element housing portions 32 and 33 were not filled with silicone resin.

(Example 2)
A fluorescent lamp was manufactured in the same manner as in Example 1 except that the temperature protection element 27 was removed and the lead wire 23 was directly connected to the terminal 29.

(Comparative Example 1)
A fluorescent lamp was manufactured in the same manner as in Example 1 except that the base 100 shown in FIG. 9 was used as the base and the temperature protection element 104 was removed and only the temperature protection element 103 was used in the same manner as in Example 2. .

  A lighting life test was performed using the fluorescent lamps of Examples 1 and 2 and Comparative Example 1. As a result, in the fluorescent lamp of Example 1, when the lighting time exceeded 9000 hours (end of life), the temperature of the electrode sealing portion 19 increased, but the temperature protection element 27 quickly responded and the circuit was interrupted. It was possible to do it promptly. In addition, in the fluorescent lamp of Example 2, the temperature of the electrode sealing portion 19 rose when the lighting time exceeded 9000 hours (end of life), but the temperature protection element 26 quickly responded, and the circuit was quickly shut down. Could be done. However, in the fluorescent lamp of Comparative Example 1, when the lighting time exceeded 9000 hours (end of life), the temperature of the electrode sealing portion 19 rose, but the temperature protection element 103 did not respond quickly and the circuit was interrupted. Could not be done promptly.

  As described above, the present invention can provide a fluorescent lamp with high productivity and capable of reliably detecting the heat generation / temperature rise of the fluorescent tube at the end of its life, and by using the fluorescent lamp of the present invention. A highly safe lighting device can be provided, and its industrial utility value is great.

It is a front view which shows an example of the fluorescent lamp of this invention. It is a principal part schematic of the fluorescent tube used for this invention. It is the top view A of the nozzle | cap | die used for this invention, and sectional drawing B of the II line | wire. It is the top view A which shows the other form of a nozzle | cap | die used for this invention, and sectional drawing B of the II-II line. It is the top view A which shows the further another form of the nozzle | cap | die used for this invention, and sectional drawing B of the III-III line. It is a perspective view before incorporating a temperature protection element in a die used for the present invention. It is a perspective view of the state which accommodated the electrode sealing part of the fluorescent tube used for this invention in the fluorescent tube storage part of a nozzle | cap | die. It is a perspective view which shows an example of the illuminating device of this invention. It is the top view A of the conventional nozzle | cap | die, and sectional drawing B of the IV-IV line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fluorescent lamp 11 Base 12 Fluorescent tube 12a, 12b Valve 13 Bridge connection part 14, 15 Electrode 16, 17 Stem 18, 19 Electrode sealing part 20, 21, 22, 23, 26a, 26b, 27a, 27b Lead wire 24, 25, 28, 29 Terminal 26, 27 Temperature protection element 30, 31 Fluorescent tube storage part 32, 33 Temperature protection element storage part 34a, 34b, 34c, 34d Outer wall 35, 36 Protruding piece 37, 38, 39, 40 Support member 41 Support piece 42 Support column 43 Adhesive 44, 45 Lid 46 Gap 50 Illumination device 51 Fluorescent lamp

Claims (6)

A fluorescent lamp comprising a base, a fluorescent tube fixedly held on the base, and a temperature protection element,
The fluorescent tube has an electrode sealing portion in which electrodes are sealed at both ends, and has a discharge path bent inside,
The base includes a fluorescent tube storage portion for storing the electrode sealing portion of the fluorescent tube, and a temperature protection element storage portion for storing the temperature protection element,
The fluorescent tube housing portion is formed of an outer wall of the base and two protruding pieces protruding from the outer wall toward the electrode sealing portions of the fluorescent tube,
A gap is formed between the tip portions of the two protruding pieces,
The temperature protection element storage portion is formed from the outer wall and one of the protruding pieces,
The electrode sealing portion is disposed in the fluorescent tube housing portion,
The temperature protection element is disposed in the temperature protection element storage unit,
The fluorescent lamp, wherein the electrode is connected to the temperature protection element. The fluorescent lamp according to claim 1, further comprising a support piece having a predetermined distance from the projecting piece between tip ends of the two projecting pieces. 2. The fluorescent lamp according to claim 1, further comprising a support column having a predetermined distance from the projecting piece between tip ends of the two projecting pieces. The fluorescent tubes, fluorescent lamps according to any one of claims 1 to 3 which is fixed by adhesive to the ferrule. The fluorescent lamp according to any one of claims 1 to 4 , wherein a space exists in the temperature protection element storage portion. Lighting apparatus characterized by comprising a fluorescent lamp according to any one of claims 1-5.

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