JP3959694B2 - Fluorescent lamps and lighting fixtures - Google Patents

Description

The present invention relates to an annular fluorescent lamp and a lighting fixture using the fluorescent lamp.

  2. Description of the Related Art Conventionally, in an annular fluorescent lamp, for example, as described in JP-A-2-61956 or JP-A-6-203798, two substantially circular C-shaped annular bulbs having a small tube diameter are arranged on the same plane. There is a fluorescent lamp which has a bulb which is arranged concentrically on top and which has one end of each annular bulb portion connected to each other by a bridge connection to form one discharge path (see Patent Literature 1 and Patent Literature 2).

A pair of electrodes are sealed at both ends of the discharge path of the bulb, and both ends of the discharge path of the bulb sealed with this electrode and the middle portion of the discharge path of the bulb are brought into close proximity to each other. Covered with a base.
JP-A-2-61956 JP-A-6-203798

  However, in the conventional fluorescent lamp, the intermediate bridge connection part farthest from the electrodes at both ends of the discharge path is configured as the coldest part, and the mercury vapor pressure in the bulb is kept appropriate by this coldest part. However, since the middle part of the discharge path, that is, the coldest part is located near both ends of the discharge path where the electrode is sealed, the temperature of the coldest part rises due to the heat from the electrode part, and the mercury vapor pressure in the bulb Is not suitable, and there is a problem that the brightness decreases.

  This invention is made | formed in view of such a point, and it aims at providing the fluorescent lamp and lighting fixture which can suppress the fall of brightness by suppressing the temperature rise of the coldest part.

In the fluorescent lamp according to claim 1, a plurality of annular bulbs having different diameters coated with phosphor on the inner surface are provided concentrically on the same plane, and the plurality of annular bulbs communicate with each other to form a single discharge path. both end portions of the discharge passage of the valve; a pair of electrodes and sealed across the discharge path of the annular valve; that the formed annular valve to be provided with; the rare gas and mercury sealed in annular valve And a base formed over the middle part of the discharge path of the bulb and formed on the middle part side of the discharge path of the bulb .

Claim 2 is the fluorescent lamp of claim 1 wherein, the mouthpiece is characterized in that the casing portion formed of a metal and the lamp pins are formed by combining a case portion that protrudes.

A lighting fixture according to claim 3 is provided with the fluorescent lamp according to claim 1 or 2 ; and a container having a lamp holder that contacts a portion made of metal of a base of the fluorescent lamp. To do.

According to the fluorescent lamp of claim 1, in the annular bulb in which a plurality of annular bulb portions having different diameters are provided concentrically on the same plane, an intermediate portion where the coldest portion is easily formed can be maintained at an appropriate temperature. This makes it possible to turn on the fluorescent lamp in a highly efficient state.

According to the fluorescent lamp of claim 2, wherein, since the formed separately and a case portion which lamp pin is formed by the case portion gold genus projecting, can maintain a good insulating lamp pins.

According to the lighting fixture according to claim 3, since the portion having high thermal conductivity and heat dissipation of the base of the fluorescent lamp comes into contact with the lamp holder and is radiated well to the fixture main body side, the temperature of the fluorescent lamp is set appropriately. By maintaining the temperature, the fluorescent lamp can be turned on in a highly efficient state.

  Hereinafter, an embodiment of a fluorescent lamp and a lighting fixture of the present invention will be described with reference to the drawings.

  1 and 2 show a first other embodiment of the present invention, FIG. 1 is a bottom view of a fluorescent lamp, and FIG. 2 is a sectional view of a lighting fixture.

  In FIG. 1, reference numeral 1 denotes an annular fluorescent lamp, and this fluorescent lamp 1 has a bulb 2. The bulb 2 is made of, for example, glass having translucency, and has two substantially C-shaped annular valve portions 3 and 4 having different diameters arranged concentrically on the same plane. , 4 are connected to each other through a thin tube 5 and communicated to form a continuous discharge path 6.

  A fluorescent material is applied to the inner surface of the bulb 2, and a rare gas such as argon gas and mercury are enclosed in the bulb 2, and an amalgam is enclosed as necessary. A pair of electrodes (filaments) 8 are sealed at the other ends of the annular bulbs 3, 4, that is, at both ends 7 of the discharge path 6 of the bulb 2. The bridge connection portion of the intermediate portion 9 of the discharge path 6 of the bulb 2 is configured as the coldest portion 10.

  A base 11 is provided between both ends of the annular valve portions 3 and 4, that is, across both end portions 7 and the intermediate portion 9 of the valve 2. The base 11 includes a base case 12 made of a synthetic resin having insulating properties. The base case 12 has four lamp pins (not shown) projecting toward the inner diameter side. Are connected to the respective electrodes 8 and are connected to conductive wires led out from the valve 2. Inside the base 11, a proximity conductor 13 such as an aluminum plate is disposed in contact with or close to the intermediate portion 9 at a place where the both end portions 7 and the intermediate portion 9 of the bulb 2 are partitioned.

  In FIG. 2, reference numeral 21 denotes a ceiling surface, and a ceiling ceiling 22 is installed on the ceiling surface 21, and a concrete ceiling 23 of a direct lighting fixture is attached to the ceiling ceiling 22. The container 23 has an instrument main body 24, and an adapter 25 that is mechanically hooked and locked to the hook ceiling 22 and electrically connected to the central part of the instrument main body 24 is attached to the instrument main body 24. A holder mounting portion 26 is formed on the lower surface of the holder, and a holder body 27 to which the fluorescent lamp 1 is mounted is detachably mounted on the holder mounting portion 26.

  A lamp socket 28 is integrally formed at one end of the holder body 27, and a lamp holder 29 is attached to the other end. The lamp socket 28 includes a holder portion 30 that engages with the inner portion of the base 11, and four connection holes (not shown) into which the lamp pins protruding from the base 11 are inserted are formed in the holder portion 30. A connection terminal (not shown) that is electrically connected to the lamp pin inserted inside is provided. The lamp holder 29 is formed of a non-conductive material, and has a holder portion 31 that engages with an inner portion of the annular bulb portion 3 on the opposite side in the circumferential direction from the base 11 of the fluorescent lamp 1 and on the inner diameter side. is doing. The fluorescent lamp 1 mounted on the container 23 by the holder body 27 is supported in a horizontal state in which the two annular bulbs 3 and 4 are arranged substantially horizontally below the instrument body 24.

  The fixture body 24 is provided with a lighting device having an inverter circuit (not shown) and the like, and the fluorescent lamp 1 connected to the lamp socket 28 of the holder body 27 is turned on at a high frequency by this lighting device.

  A shade 32 that covers the lower surface of the instrument body 24 and has translucency is mounted. A shade attachment mechanism 33 for detachably attaching the shade 32 is disposed on the peripheral portion of the instrument body 24.

  In the fluorescent lamp 1 in which the two concentric annular bulbs 3 and 4 are communicated to provide one discharge path 6, the bulb 2 has a small diameter and the discharge path 6 has a long length. Although the startability at the time of lighting is poor and the starting voltage becomes high, since the proximity conductor 13 is provided in the intermediate portion 9 of the bulb 2, a discharge is induced between one electrode 8 and the proximity conductor 13 at the time of startup. At the same time, a discharge is induced from the adjacent conductor 13 to the other electrode 8, and by making the discharge between both electrodes 8 due to the discharge inducing action of the adjacent conductor 13, starting becomes easy and the starting voltage can be lowered. it can.

  By reducing the starting voltage in this way, the starting can be easily performed even when the ambient temperature is low, and the lighting device can be miniaturized using a small lighting component having a small withstand voltage capacity.

  Further, when a conductive material such as metal is used for the lamp holder 29, the voltage applied at the time of start does not reach the intermediate portion 9 of the bulb 2 but leaks at the portion of the lamp holder 29, and from one of the annular bulb portions 3 and 4. However, when the lamp holder 29 is formed of a non-conductive material, leakage at the lamp holder 29 can be eliminated and deterioration of the startability can be prevented.

  Next, FIG. 3 shows a second other embodiment, and FIG. 3 is a bottom view of the fluorescent lamp.

  A part of the conductive wire (wire) 41 connected to the electrode 8 and led out of the bulb 2 is used as the proximity conductor 13 so that the conductive wire 41 is hooked on the narrow tube 5 of the middle portion 9 of the bulb 2. Combined.

  In addition, a discharge inducing action can also be obtained by the conductive wire 41 engaged with the intermediate portion 9 of the bulb 2 in this way, and the discharge induction of the conductive wire 41 can be obtained in the same manner as the proximity conductor 13 of the first embodiment. By adapting the discharge between the two electrodes 8 by the action, starting becomes easy and the starting voltage can be lowered. In addition, by using the conductive wire 41, the proximity conductor 13 can be substituted.

  Next, FIG. 4 shows a third other embodiment, and FIG. 4 is a bottom view of the fluorescent lamp.

  A wall-shaped heat shield part 42 is formed in the base case 12 of the base 11 so as to partition between the both end parts 7 and the intermediate part 9 of the valve 2.

  The heat shield portion 42 can reduce the heat transmitted to the middle portion 9 of the bulb 2, that is, the coldest portion 10, of the bulb 2 where the electrode 8 is sealed at the time of lighting. Thereby, it can suppress that the coldest part 10 raises temperature, the mercury vapor pressure in the valve | bulb 2 can be kept appropriate, and the fall of brightness can be suppressed.

  If the proximity conductor 13 of the first embodiment or the conductive wire 41 of the second embodiment is applied to the fluorescent lamp 1, the same operational effects as those of the embodiments are obtained.

  Next, FIG. 5 shows a fourth other embodiment, and FIG. 5 is a perspective view of the lamp socket.

  A proximity conductor 43 is provided in the vicinity of one side of the holder portion 30 of the lamp socket 28, that is, in the vicinity of one side corresponding to the intermediate portion 9 side of the bulb 2 in the base 11 connected to the holder portion 30.

  Then, when the base 11 of the fluorescent lamp 1 is connected to the holder portion 30 of the lamp socket 28, the proximity conductor 43 provided in the holder portion 30 comes close to the intermediate portion 9 of the bulb 2 and a discharge inducing action can be generated. The same effects as those of the first embodiment are achieved.

  The fluorescent lamp 1 in this case is particularly effective for the fluorescent lamp 1 having no adjacent conductor as in the third embodiment shown in FIG. 4, but the first embodiment shown in FIG. This embodiment is also effective for the fluorescent lamp 1 having the proximity conductor 13 or the conductive wire 41 as in the second embodiment shown in FIG.

  In the figure, 44 is a connection hole into which the lamp pin of the fluorescent lamp 1 is inserted.

  Next, FIG. 6 shows a fifth other embodiment, and FIG. 6 is a bottom view of the fluorescent lamp.

  The annular bulb portion 3 inside the bulb 2 of the fluorescent lamp 1 is formed in a substantially C shape, and the outside annular bulb portion 4 is divided into a substantially semi-annular pair of bulb portions 4a. The end portion and one end of each bulb portion 4a are connected via a thin tube 5 and communicated to form a continuous discharge path 6.

  An electrode 8 is sealed at the other end of each bulb portion 4 a, that is, at both ends 7 of the discharge path 6 of the bulb 2, and a base 11 is provided across the both ends 7. A proximity conductor 13 is provided inside the base 11 so as to be close to or in contact with an intermediate portion of the inner annular bulb portion 3, that is, an intermediate portion 9 of the discharge path 6 of the bulb 2.

  Thus, a discharge inducing action can be obtained by the proximity conductor 13 provided in the intermediate portion 9 of the bulb 2 as described above, and between the two electrodes 8 by the discharge inducing action of the proximity conductor 13 as in the first embodiment. By accelerating the discharge, it becomes easy to start and the starting voltage can be lowered.

  In this fluorescent lamp 1, each bridge connection portion of the annular bulb portions 3 and 4 of the bulb 2 farthest from the base 11 is configured as the coldest portion 10.

  Next, FIG. 7 shows a sixth other embodiment, and FIG. 7 is a bottom view of the fluorescent lamp.

  A part of the conductive wire 41 connected to the electrode 8 and led out of the bulb 2 is used as the proximity conductor 13 so that the conductive wire 41 is hooked on the intermediate portion 9 of the annular valve portion 3 inside the bulb 2. Engaged. The base 11 is provided across both end portions 7 and the intermediate portion 9 of the bulb 2, and a conductive wire 41 is disposed inside the base 11.

  In addition, a discharge inducing action can also be obtained by the conductive wire 41 engaged with the intermediate portion 9 of the bulb 2 in this way, and the discharge induction of the conductive wire 41 can be obtained in the same manner as the proximity conductor 13 of the fifth embodiment. By adapting the discharge between the two electrodes 8 by the action, starting becomes easy and the starting voltage can be lowered. In addition, by using the conductive wire 41, the proximity conductor 13 can be substituted.

  Next, FIG. 8 shows a seventh other embodiment, and FIG. 8 is a bottom view of the fluorescent lamp.

  The base case 12 of the base 11 is formed of a translucent material such as milky white or translucent, for example, and is provided across both end portions 7 and the intermediate portion 9 of the bulb 2. A heat dissipating part 45 as a heat dissipating means is provided across each bridge connecting part of the annular valve parts 3 and 4 of the valve 2, ie, between the coldest parts 10. The heat radiating portion 45 is made of a heat radiating material such as silicon, which has a higher heat radiating property than the glass of the material of the bulb 2.

  And the heat radiation part 45 can promote the heat radiation of the coldest part 10 at the time of lighting, can suppress the temperature rise of the coldest part 10, keep the mercury vapor pressure in the bulb 2 appropriate, and reduce the brightness. Can be suppressed. Moreover, the coldest part 10 that is the free end of the valve 2 can be fixed by the heat radiating part 45, and the rigidity can be improved.

  Furthermore, since the base 11 has translucency, even if the base 11 covers the intermediate part 9 of the bulb 2, a part of the light of the covered part can be emitted, and a decrease in the luminous flux can be suppressed. .

  If the proximity conductor 13 of the fifth embodiment or the conductive wire 41 of the sixth embodiment is applied to the fluorescent lamp 1, the same effects as those of the respective embodiments can be obtained.

  Next, FIG. 9 shows an eighth other embodiment, and FIG. 9 is a perspective view of the lamp socket.

  The proximity conductor 43 is provided in the vicinity of one end of the holder portion 30 of the lamp socket 28, that is, in the vicinity of one end corresponding to the intermediate portion 9 side of the bulb 2 in the base 11 portion connected to the holder portion 30.

  Then, when the base 11 of the fluorescent lamp 1 is connected to the holder portion 30 of the lamp socket 28, the proximity conductor 43 provided in the holder portion 30 comes close to the intermediate portion 9 of the bulb 2 and a discharge inducing action can be generated. The same effects as those of the fifth other embodiment are achieved.

  The fluorescent lamp 1 in this case is particularly effective for the fluorescent lamp 1 having no adjacent conductor as in the seventh other embodiment shown in FIG. 8, but the fifth lamp shown in FIG. This is also effective for the fluorescent lamp 1 having the proximity conductor 13 or the conductive wire 41 as in the other embodiment and the sixth other embodiment shown in FIG.

  10 to 12 show a first embodiment of the present invention, in which FIG. 10 (a) is a perspective view of a part of a fluorescent lamp, FIG. 10 (b) is a sectional view of a base, and FIG. FIG. 12 is an explanatory view showing the efficiency characteristics with respect to the ambient temperature.

  In FIG. 10, for example, the fluorescent lamp 1 includes an inner annular bulb portion 3 instead of providing the base 11 in the annular bulb portion 4 outside the fluorescent lamp 1 of the fifth other embodiment shown in FIG. 6. The base 11 is provided with a structure. The base case 12 of the base 11 is divided into two in the vertical direction perpendicular to the tube axis direction of the valve 2, and a case portion 51 made of, for example, synthetic resin having insulating properties is provided on the upper side, and the case on the lower side. A case portion 52 serving as a heat radiating means such as aluminum or resin having higher thermal conductivity and heat dissipation than the portion 51 is disposed. Both case portions 51 and 52 are fixedly coupled by fixing both ends 7 of the valve 2 and screwing a screw 53 inserted from the lower case portion 52 to the upper case portion 51. A lamp pin 54 projects from the upper case portion 51.

  In FIG. 11, a lamp holder 55 is attached to the lamp socket 28 of the container 23 in contact with the lower case part 52 connected to the holder part 30. The lamp holder 55 is formed by a metal leaf spring, for example.

  When the base 11 of the fluorescent lamp 1 is connected to the holder part 30 of the lamp socket 28, the lamp holder 55 comes into contact with the lower case part 52 of the base 11. When the fluorescent lamp 1 is lit, the heat of the tube wall of the bulb 2 is transmitted to the base 11, and in particular, the lamp is in contact with the case 52 while being well radiated into the air from the case 52 with high thermal conductivity and heat dissipation. Heat is radiated well to the container 23 through the holder 55.

  FIG. 12 shows the efficiency characteristics with respect to the ambient temperature. A curve with a in the figure is the case of the present embodiment, and a curve with b in the figure is the case portion 52 having high thermal conductivity and heat dissipation. A case where the lamp holder 55 is not provided is shown. In curve a, the efficiency is highest when the ambient temperature is around 25 ° C., and in curve b, the efficiency is highest when the ambient temperature is around 15 ° C. Since the temperature in the room where the lighting fixture is installed is generally maintained at about 25 ° C. by the air conditioning equipment, the fluorescent lamp 1 according to the present embodiment is suitable for the atmospheric temperature in the room and has the highest efficiency. Can be lit.

  Further, since the lamp holder 55 goes around the lower side of the base 11 than the holder part 30 of the lamp socket 28, the stability when the base 11 of the fluorescent lamp is connected to the lamp socket 28 can be improved.

  Next, FIG. 13 shows a second embodiment of the present invention, and FIG. 13 is a perspective view of a part of the fluorescent lamp.

  For example, the fluorescent lamp 1 has the same structure as the fluorescent lamp 1 of the first embodiment shown in FIG. The base case 12 of the base 11 is divided into two in the tube axis direction of the valve 2, and a case portion 61 made of, for example, synthetic resin having insulating properties is disposed on both end portions 7 side of the valve 2, and on the intermediate portion 9 side. A case portion 62 serving as a heat radiating means such as aluminum or resin having higher heat conductivity and heat dissipation than the case portion 61 is disposed.

  When the fluorescent lamp 1 is turned on, the heat of the tube wall of the bulb 2 is transmitted to the base 11 and radiated. In particular, the case portion 62 having high thermal conductivity and heat dissipation is radiated well in the air, and the heat of the intermediate portion 9 of the valve 2 that is in contact with the case portion 62, that is, the coldest portion 10, is radiated well. Therefore, it is possible to suppress the temperature of the coldest part 10 from rising, to keep the mercury vapor pressure in the bulb 2 appropriate, and to suppress a decrease in brightness.

  As in the first embodiment, the fluorescent lamp 1 having the case 62 is connected to the instrument 23 in which the lamp holder 55 is provided in the lamp socket 28, whereby the lamp holder 55 that contacts the case 62 is provided. Therefore, heat can be dissipated well to the side of the container 23.

  When the lamp socket 28 includes the proximity conductor 43 as in the fourth other embodiment shown in FIG. 5 or the eighth other embodiment shown in FIG. 9, the fluorescent lamp 1 is started only when it is started. The startability can be further improved by supplying a current that assists.

  The lamp holder 29 engages and supports the annular bulb portion 3 on the inner side of the fluorescent lamp 1, but engages and supports both the outer annular bulb portion 4 and the annular bulb portions 3 and 4. It may be.

  Next, FIG. 14 shows a third embodiment of the present invention, and FIG. 14 is an explanatory view of a part of the fluorescent lamp and the lighting device.

  A conductive wire 41 connected to the electrode 8 of the inner annular bulb 3 is electrically connected to the proximity conductor 13 of the fluorescent lamp 1.

  In the lighting device 71 to which the fluorescent lamp 1 is connected, a rectifier circuit (not shown) is connected to an AC power source, a smoothing capacitor C1 is connected between output terminals of the rectifier circuit, and a half bridge is connected in parallel to the smoothing capacitor C1. A type inverter circuit 72 is connected. The inverter circuit 72 is configured by a series circuit of transistors Q1 and Q2, and a drive circuit (not shown) is connected to the gates of the transistors Q1 and Q2. A ballast choke L and both electrodes 8 of the fluorescent lamp 1 are connected in series between both terminals of the transistor Q2, and a starting capacitor C2 is connected between these electrodes 8. A floating capacity exists between the intermediate portion 9 of the valve 2 and the adjacent conductor 13.

  Then, the transistors Q1 and Q2 of the inverter circuit 72 are alternately turned on and off to generate a high frequency, and the fluorescent lamp 1 is started and lit.

  At this time, since the proximity conductor 13 of the fluorescent lamp 1 is connected to the electrode 8 on the high potential side, the potential of the intermediate portion 9 of the bulb 2 is increased, the leakage current to the ground plane is increased, and the startability is improved. To do.

It is a bottom view of the fluorescent lamp which shows the 1st other embodiment of this invention. It is sectional drawing of the lighting fixture of embodiment same as the above. It is a bottom view of the fluorescent lamp which shows the 2nd other embodiment of this invention. It is a bottom view of the fluorescent lamp which shows the 3rd other embodiment of this invention. It is a perspective view of the lamp socket which shows 4th other embodiment of this invention. It is a bottom view of the fluorescent lamp which shows the 5th other embodiment of this invention. It is a bottom view of the fluorescent lamp which shows 6th other embodiment of this invention. It is a bottom view of the fluorescent lamp which shows 7th other embodiment of this invention. It is a perspective view of the lamp socket which shows 8th other embodiment of this invention. The fluorescent lamp of the 1st Embodiment of this invention is shown, (a) is a perspective view of a part of fluorescent lamp, (b) is sectional drawing of a nozzle | cap | die. It is a partial side view of the lighting fixture of embodiment same as the above. It is explanatory drawing which shows the characteristic of the efficiency with respect to atmospheric temperature of embodiment same as the above. It is a one part perspective view of the fluorescent lamp which shows the 2nd Embodiment of this invention. It is explanatory drawing of a part of fluorescent lamp and lighting device which show the 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fluorescent lamp, 2 ... Bulb, 3, 4 ... Annular bulb part, 6 ... Discharge path, 8 ... Electrode, 10 ... Coldest part, 11 ... Base, 13 ... Proximity conductor, 23 ... Appliance body, 28 ... Lamp socket, 41 ... Conductive wire, 42 ... Heat shield, 43 ... Proximity conductor, 45 ... As heat dissipation means , 52... Case part as heat dissipation means, 55... Lamp holder, 62... Case part as heat dissipation means,

Claims (3)

A plurality of annular bulbs having different diameters coated with phosphor on the inner surface are provided concentrically on the same plane, and a plurality of annular bulbs are communicated to form a single discharge path. With a valve;
With noble gas and mercury enclosed in the annular valve;
A pair of electrodes sealed at both ends of the discharge path of the annular bulb;
A base provided over both ends of the discharge path of the bulb and an intermediate portion of the discharge path of the bulb, the intermediate portion side of the discharge path of the bulb being formed of metal;
A fluorescent lamp characterized by comprising: 2. The fluorescent lamp according to claim 1 , wherein the base is formed by joining a case portion made of metal and a case portion provided with a lamp pin projectingly. A fluorescent lamp according to claim 1 or 2;
  A container having a lamp holder in contact with the metal portion of the base of the fluorescent lamp;
The lighting fixture characterized by comprising.

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