JP2013008601A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular fluorescent lamp having a base structure for improving total luminous flux of a lamp.SOLUTION: This fluorescent lamp includes: a plurality of almost concentrically disposed ring-shaped tubes composed of outermost ring-shaped tube, innermost ring-shaped tube, and one or more intermediate ring-shaped tubes disposed between the outermost ring-shaped tube and the innermost ring-shaped tube, the respective ring-shaped tube having different ring diameters ; connecting parts for communicating the ring-shaped tube with the adjacent ring-shaped tube; a pair of electrodes provided at one end part of the outermost ring-shaped tube and one end part of the innermost ring-shaped tube; and a base for surrounding the ends of a plurality of the ring-shaped tubes. The width of a portion covering the intermediate ring-shaped tube in the base in the circumferential direction of the ring-shaped tube is narrower than the width of portions covering the outermost ring-shaped tube and the innermost ring-shaped tube in the circumferential direction of the ring-shaped tube.

Description

  The present invention relates to an annular fluorescent lamp.

  As an example of an annular fluorescent lamp in which two annular tubes are connected, there is a double annular fluorescent lamp as shown in Patent Document 1. FIG. 6 is a diagram showing a double-ring fluorescent lamp 10. The double-ring fluorescent lamp 10 is formed by connecting two ring-shaped arc tubes (1 and 2) provided concentrically at a joint, One discharge path is formed between the electrodes provided at the two tube ends. A base 3 is provided so as to surround the tube ends of the two arc tubes 1 and 2. The base 3 is generally divided into two pieces in such a manner that a lamp is sandwiched from both sides, and the two bases are connected by screws, claws or the like. As the arc tube, a glass tube such as soda glass is usually used. The base has a recess 34 for inserting a metal lamp for connecting a ring-shaped fluorescent lamp and a luminaire (not shown), and the recess 34 is electrically connected to electrodes provided at the tube ends of the arc tubes 1 and 2. The four cap pins connected are arranged in a square shape.

  FIG. 7 is an enlarged partial cross-sectional view of the base part of FIG. In FIG. 7, reference numeral 11 denotes an intermediate tube end which is one end of the arc tubes 1 and 2, and a pair of electrodes (not shown) is provided on the other tube end hidden behind the base 3. Yes.

  Inside the two arc tubes 1 and 2, a phosphor is applied to the entire circumference, and visible light is emitted by irradiating the phosphor with ultraviolet rays inside the arc tube. Therefore, it is desirable that the phosphor is evenly applied all around the arc tube because it emits more visible light. However, if the phosphor is applied to the glass processing part such as the tube end and the joint, Since the potential for defects such as shape defects and leaks is increased, the phosphor of the corresponding part is usually wiped in advance and sealed.

  In the tube end portion 11, the boundary to which the phosphor is applied is indicated by a boundary line A, and the phosphor is not applied to the center side of the base from the boundary line A for the reason described above. On the other hand, the boundary line B is a line indicating the end of the base 3, and the center side of the base from the boundary line B is covered with the base 3, so that the intermediate pipe end 11 and the other pipe end (not shown) The electrode is hidden and invisible.

  In the arc tubes 1 and 2, a region between the boundary line A and the boundary line B is a region where the phosphor is applied and is covered with the base 3.

Japanese Patent No. 3135526

  As described above, in Patent Document 1, in the arc tubes 1 and 2, the phosphor is applied between the boundary line A and the boundary line B and is covered with the base 3. Therefore, the light emitted in this region basically stays inside the base and does not become effective light for illuminating the surroundings, and as a result, there is a possibility that the total luminous flux as a lamp is reduced. Therefore, it is desirable to make this region as narrow as possible. However, if this region is made too narrow, the region where the phosphor is not applied can be seen due to looseness or variation of the die, and the appearance of the product may be deteriorated. In addition, since the base 3 fixes the arc tubes 1 and 2 and also serves as a connection to the lighting fixture, if the base is too narrow, the fixing of the lamp becomes unstable, which causes the lamp not to be lit due to a lamp crack. May also be connected.

  The problem to be solved by the present invention is to provide an annular fluorescent lamp having a base structure that improves the total luminous flux of the lamp.

  In order to solve the above-described problems, the present invention is arranged between an outermost annular tube having a different ring diameter, an innermost annular tube, and the outermost annular tube and the innermost annular tube. A plurality of annular pipes that are composed of one or more intermediate annular pipes and are arranged substantially concentrically; a connecting portion that communicates the annular pipe with an annular pipe adjacent to the annular pipe; A pair of electrodes provided at one end of the inner annular tube and a base surrounding the ends of the plurality of annular tubes, and the circumferential width of the annular tube of the portion covering the intermediate annular tube in the base is The outermost annular tube or the portion covering the innermost portion is narrower than the circumferential width of the annular tube.

  Alternatively, in order to solve the above-described problem, the present invention is arranged between the outermost annular tube having a different ring diameter, the innermost annular tube, and the outermost annular tube and the innermost annular tube. A plurality of annular tubes that are arranged in a substantially concentric manner, a connecting portion that communicates with the annular tube adjacent to the annular tube, and one end portion of the outermost annular tube A pair of electrodes for discharging between the outermost ring and one end of the innermost annular tube, and a base surrounding the end of the annular tube. It is shaped to match the curve with the inner surface of the annular tube, and is characterized by a constricted portion at the center.

  An annular fluorescent lamp having a base structure that improves the total luminous flux of the lamp can be provided.

1 is an overall view of a ring-shaped fluorescent lamp 30 illustrating a first embodiment. The base 33 expanded partial sectional view explaining a 1st example. The enlarged partial view of the nozzle | cap | die 33 when FIG. 2 is seen from another direction. The whole figure of the ring-shaped fluorescent lamp 30 explaining a 2nd Example. The base 33 expanded partial sectional view for explaining a second embodiment. Double ring fluorescent lamp 10. 2 is an enlarged partial cross-sectional view of a base portion of a double ring fluorescent lamp 10. The whole figure of the ring-shaped fluorescent lamp explaining a 3rd Example. The whole figure of the ring-shaped fluorescent lamp explaining another Example.

  Embodiments of the present invention will be described below with reference to the drawings.

  1, 2 and 3 are views showing an annular fluorescent lamp 30 in which four annular arc tubes according to the first embodiment of the present invention are connected. FIG. 1 shows the annular fluorescent lamp 30 viewed from one direction. 2 is an enlarged partial cross-sectional view of the base 33 of FIG. FIG. 3 is an enlarged partial view of the base 33 when the annular fluorescent lamp 30 is viewed from the other direction. The ring-shaped fluorescent lamp 30 according to the present invention is a fluorescent lamp used mainly for home lighting equipment such as a living room and a dining room. FIG. 3 is a view showing the structure of the base 33 on the side attached to the instrument. The annular fluorescent lamp 30 includes annular arc tubes 31a, 31b, 31c, 31d, joints 32a, 32b, 32c, and a base 33. Each of the annular arc tubes 31a, 31b, 31c, and 31d has a C-shape, and each has a tube end. The annular arc tubes 31a, 31b, 31c, and 31d have different ring diameters and are arranged so as to be substantially concentric in the same plane. At this time, the C-shaped gap portions of the respective annular arc tubes are arranged so as to face the same direction. The ring-shaped arc tubes 31a, 31b, 31c and 31d are a joint portion 32a for coupling the ring-shaped arc tubes 31a and 31b, a junction portion 32b for coupling the ring-shaped arc tubes 31b and 31c, and a junction for coupling the ring-shaped arc tubes 31c and 31d. It is joined by the part 32c. The tube ends of the annular arc tubes 31 a to 31 d are surrounded by a base 33. A recess 34 is provided on the back side of the base 33, and a base pin 35 is disposed inside the recess 34. Furthermore, by arranging the cap pins 35, 35 on a straight line, it becomes possible to reduce the distance between the tube ends of each annular arc tube, and while maintaining the same ring diameter, the discharge path length is extended, and the higher It is also possible to improve output or efficiency. Glass tubes such as soda glass and lead-free glass are used for the annular arc tubes 31a to 31d. Among the annular arc tubes 31a, 31b, 31c and 31d, electrodes are provided at two tube ends to form one discharge path. In the present embodiment, among the ring-shaped arc tubes 31a, 31b, 31c, and 31d, one end portion of 31a that is the outermost arc tube and one end of 31d that is the innermost arc tube. The electrodes are respectively provided on the first and second electrodes, forming one discharge path extending from one end of 31a to one end of 31d. As shown in FIG. 3, two recesses 34 are provided in this embodiment. Two cap pins 35 are respectively provided in the recess 34. Although not shown, the cap pin 35 and the electrode are electrically connected.

  The base 33 is divided into two pieces, and the two bases are joined with screws, claws or the like in such a manner that the lamp is sandwiched from both sides. In FIGS. 1 and 2 of this embodiment, one of the two is not shown because it is shown from the front side. For the base 33, for example, PBT resin, PC resin, PET resin or the like is used. However, the resin may contain glass in order to increase the heat resistant temperature and weather resistance.

  FIG. 2 is an enlarged partial sectional view of the base 33. A pair of tube ends are provided at both ends of each of the annular arc tubes 31a to 31d, and the lamp lengths of the respective arc tubes are arranged so that the tube ends of the four arc tubes are arranged substantially in the same line in the base 33. And the joint position is adjusted and manufactured. In FIG. 2, only one of the tube ends is shown as an intermediate tube end 41. Since the ring-shaped fluorescent lamp in this embodiment connects four ring-shaped arc tubes at the junctions 32a to 32c to form one discharge path, the electrodes are hidden inside the base 33 and are not shown. One pair is provided at the other end of the pipe 31d. Further, an exhaust pipe is provided at one end of each of the annular arc tubes 31a to 31d, but this is omitted in the figure.

Phosphors are applied to the inner surfaces of the arc tubes 31a to 31d, respectively. In this embodiment, the phosphor is a red phosphor (Y ₂ O ₃ : Eu), a green phosphor (LaPO ₄ : Ce, Tb), and a blue phosphor (Sr, Ca, Ba, Mg) ₅ (PO ₄ ) _3. Although a rare earth phosphor made of Cl: Eu) is mixed and applied, the type of the phosphor is not limited to this. The fluorescent lamp emits visible light by irradiating the phosphor with ultraviolet rays emitted inside the arc tube. For this reason, it is desirable that the phosphor is evenly applied all around the arc tube because more visible light is emitted. However, if phosphors are applied to glass processing parts such as tube ends and joints, the potential for defects such as shape defects and leaks increases. Wiping and sealing are performed.

  In the intermediate tube end 41, the boundary where the phosphor is applied is indicated by a boundary line A, and the phosphor is not applied to the center side of the base from the boundary line A for the above-described reason. On the other hand, the boundary line B is a line indicating the end of the base 33, and the center side of the base from the boundary line B is covered with the base 3, so that the intermediate pipe end 41 and the other pipe end (not shown) The electrode is hidden and invisible.

  In the arc tubes 31a to 31d, a phosphor is applied between the boundary line A and the boundary line B, and is a region covered with a base when a conventional base is applied. Therefore, the light emitted in this region basically stays inside the base and does not become effective light for illuminating the surroundings, and as a result, there is a possibility that the total luminous flux as a lamp is reduced.

  Therefore, it is desirable to make this region as narrow as possible on the optical surface. In addition, when the lighting appearance of the entire lamp is viewed by attaching it to a lighting fixture, the base portion basically does not emit light, so that only the base portion appears dark and the lighting appearance is impaired. However, on the other hand, if this area is made too narrow, the area where the phosphor is not applied and the end of the tube will be visible due to the backlash and variation of the base. Balance is necessary after consideration.

  In terms of structure, the base 33 also serves as a connection to the lighting fixture. When the lamp is attached to the lighting fixture, the base 33 is directly stressed and coupled to the receiver, so that the base and the arc tube are fixed and held. If this is insufficient, it is assumed that problems such as lamp cracks and broken lead wires occur due to shocks such as rattling of the base and strong vibration. Therefore, fixing and holding the base and arc tube is an important point in the base design.

  However, if the width of the base is made too narrow in order to reduce the decrease in luminous flux for the above-mentioned reason, there is a problem that the contact width between the arc tube and the base decreases, and the fixing and holding of the arc tube and the base tend to become unstable. As a method for fixing the lamp and the base, for example, it is possible to fix the lamp with an adhesive such as silicone. However, there is a concern about an increase in cost due to an increase in material costs and work processes, and it is desired to solve the problem with a base structure.

  Next, in consideration of temperature, in the annular fluorescent lamp 30 in the present embodiment, the coldest spot 42 is the intermediate tube end 41 of the arc tube 31a opposite to the electrode side (not shown). The ring-shaped fluorescent lamp 30 in the present invention is a lamp that is formed by connecting a plurality of arc tubes, and is capable of relatively high power consumption and output. For this reason, when lighting is performed with a lighting fixture sealed in a resin cover typified by a household ceiling light, the temperature inside the fixture and the coldest spot temperature rise relatively high, and the reduction in luminous efficiency tends to be remarkable. In particular, if the light emitting part is covered with the base, the emitted light stays inside the base, leading to an increase in the temperature inside the base, further increasing the coldest spot temperature and reducing the luminous efficiency. End up.

  As described above, the shape of the die is desired to have a balanced structure in consideration of optical, structural, and temperature factors.

  In the present invention, by providing the constricted portion 43 on the side surface of the central portion of the base 33 which is not caused by fixing of the arc tube, the total luminous flux of the lamp is not lowered. In addition, the constricted portion 43 can provide a fluorescent lamp that has a good appearance and excellent design.

  Fixing and holding the base and arc tube has the strength of the base itself, but when the base is moved with force, the base is firmly fixed to the arc tube and there is little backlash. The looseness can be reduced as the inner dimension difference between the arc tube and the arc tube is small and the contact range is wide. In FIG. 2, it is considered that the most effective point for suppressing the backlash when the force is applied to the base in all directions of 44 is to keep many contacts between the outer surface C of the arc tube 31a and the inner surface D of the arc tube 31d. It is done. Therefore, in the present invention, the outer surface of the arc tube 31a and the inner surface of the arc tube 31d that make the base structure effective against backlash are matched with the curve of the arc tube and the contact width is ensured, while improving the luminous flux, A constricted portion 43 is provided at the central portion of the base where the effect of lowering the cold spot temperature can be expected.

  In addition, when the lamp is mounted and lit and the entire lamp is viewed, the entire base becomes slim, and the width that appears dark can be narrowed, leading to an improved lighting appearance.

  If the angle of the constricted portion is substantially parallel to the boundary line A, the light can be more effectively irradiated outside the base.

  In addition, light can be effectively emitted to the outside of the base, resulting in a decrease in temperature inside the base and a decrease in the coldest spot temperature, and a reduction in efficiency in a high temperature environment such as a sealing device can be suppressed. . In the experiment results of the inventor, a temperature drop of about 1 to 3 ° C. was confirmed.

  At the same time, it can be differentiated from the conventional base as shown in FIG. 7, and a slim and highly designable base and an annular fluorescent lamp can be provided.

  It should be noted that the constricted portion 43 is provided on the side surface of the base as in this embodiment, but only the base on the opposite side of the base portion (recess 34) shown in FIG. 1 may be provided. The base structure on the (concave part 34) side can also be a structure that does not have a constricted part.

  4 and 5 are views showing an annular fluorescent lamp 60 in which three annular arc tubes according to a second embodiment of the present invention are connected. FIG. 4 is an overall view of the annular fluorescent lamp 60, and FIG. 63 shows an enlarged partial sectional view.

  In FIG. 4, annular arc tubes 61a, 61b, 61c are arranged substantially concentrically in substantially the same plane, and a junction 62a that couples the annular arc tubes 61a, 61b, and a junction 62b that couples the annular arc tubes 61b, 61c. The base 63 is configured to surround the tube ends of the annular arc tubes 61a to 61d. A recess 34 (not shown) is provided on the back side of the cap 63, and a cap pin 35 is disposed inside the recess 34. Glass tubes such as soda glass and lead-free glass are used for the annular arc tubes 61a to 61c.

  FIG. 5 is an enlarged partial sectional view of the base 63. A pair of tube ends are provided at both ends of the ring-shaped arc tubes 61 a to 61 c, and the lamp lengths of the respective arc tubes are arranged so that the tube ends of the three arc tubes are arranged in substantially the same line in the base 63. And the joint position is adjusted and manufactured. In FIG. 5, only one of the tube ends is shown, and the tube ends are classified into an electrode tube end 75 having an electrode (not shown) and an intermediate tube end 71 having no electrode. Since the annular fluorescent lamp in the present embodiment connects three annular arc tubes at the junctions 62a to 62b to form one discharge path, one electrode is provided at the electrode tube end 75 of the arc tube 61c. The other electrode is provided at the other tube end of the arc tube 61a (not shown) hidden behind the base 63. Further, an exhaust pipe 76 is provided at one end of each of the annular arc tubes 31a to 31c. In this embodiment, arc tubes 61b and 61c are shown. The exhaust tube 76 of the arc tube 61a is a base 63. It exists on the side of the tube end hidden behind.

  The present embodiment is an annular fluorescent lamp in which three arc tubes provided on concentric circles having different ring diameters are connected. Basically, the basic configuration and effect are the same as those of the first embodiment. The features and effects described above are also applied to the second embodiment.

  As described above, by providing the constricted portion at the center of the base 63, it is possible to provide a base and an annular fluorescent lamp that are excellent in design and lead to improvement in lamp luminous flux and luminous efficiency.

  In Examples 1 and 2, the base portion has a shape that covers the tube end portions of three to four annular fluorescent lamps, but this is not restrictive. 8 and 9 are diagrams showing another embodiment of the annular fluorescent lamp. If the tube end portion on which the electrode is disposed and the concave portion 34 are covered, a fluorescent lamp maintaining safety can be realized. In that case, the distance between the ring ends can be reduced, and the light emitting area can be further increased. As a result, the total luminous flux of the lamp can be increased.

  In addition, as shown in FIG. 9, even if the base 73a is provided on the outermost ring-shaped fluorescent ring 31a and the base 73b is provided on the innermost ring-shaped fluorescent ring 31d, the total luminous flux of the lamp can be similarly increased. In addition, since the tube ends of the annular fluorescent rings 31a and 31d located on the outermost and innermost sides are pressed, the strength can be increased. In this embodiment, the cap portions are provided on the outermost ring and the innermost ring, but this is not restrictive. Depending on the position of the electrode, the base may be provided at a different position.

  In addition, although Example 1 and Example 2 demonstrated the number of arc tubes 3 and 4 as an example, it is not limited to 3 or 4, It is not limited to 3 or 4, but the same ring-shaped fluorescent lamp which connected the several arc tube is used. Can be applied.

1, 2, 31, 61 Ring-shaped arc tube 3, 33, 63 Base 10 Double ring fluorescent lamp 11 Tube end 30 Ring fluorescent lamp 32, 62 Junction 41 Intermediate tube end 42 Coldest point 43, 73 Constriction 44 Stress direction 60 Annular fluorescent lamp 71 Intermediate tube end 75 Electrode tube end 76 Exhaust tube

Claims (3)

An outermost annular tube having a different ring diameter, an innermost annular tube, and one or more intermediate annular tubes disposed between the outermost annular tube and the innermost annular tube are substantially omitted. A plurality of annular tubes arranged concentrically, a connecting portion communicating with the annular tube adjacent to the annular tube, one end of the outermost annular tube, and one end of the innermost annular tube A pair of electrodes, and a base surrounding the ends of the plurality of annular tubes,
An annular shape in which the circumferential width of the annular tube in the portion covering the intermediate annular tube in the base is narrower than the circumferential width of the outermost annular tube and the annular tube in the portion covering the innermost side. Fluorescent lamp.   An outermost annular tube having a different ring diameter, an innermost annular tube, and one or more intermediate annular tubes disposed between the outermost annular tube and the innermost annular tube are substantially omitted. A plurality of concentric circular tubes, a connecting portion communicating with the annular tube adjacent to the annular tube, one end of the outermost annular tube and one end of the innermost annular tube A pair of electrodes for discharging between them and a base that surrounds the end of the annular tube, the base comprising an outer surface of the outermost annular tube and an inner surface of the innermost annular tube An annular fluorescent lamp characterized in that it has a curved shape and a constriction at the center. The ring-shaped fluorescent lamp according to claim 1 or 2,
The base has two recesses, and a base pin provided in each of the recesses and electrically connected to the electrode,
The annular fluorescent lamp, wherein the recess is provided in the vicinity of the electrode.