JP2011175922A - Bulb-type fluorescent lamp and lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bulb-type fluorescent lamp that can be improved in light flux rise characteristics with a simple configuration, and also to provide a lighting apparatus using the same. <P>SOLUTION: By providing a partition for separating a protrusion and a lighting device on the base side inside a cover, a thermal impact from the lighting device can be suppressed and thereby the temperature at the protrusion can be kept constant. Consequently, as compared with a conventional case wherein amalgam having a low mercury vapor pressure is used, the light flux rise characteristics immediately after lighting are improved and a decline in efficiency of emission during lighting can be suppressed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bulb-type fluorescent lamp and a lighting fixture having improved luminous flux rise characteristics.

  In recent years, light bulb-type fluorescent lamps have been miniaturized to an extent equivalent to general incandescent light bulbs, and the demand for replacing the light sources of general incandescent light bulbs with light bulb-type fluorescent lamps has been promoted.

  This bulb-type fluorescent lamp has improved lamp efficiency due to the development of lamp technology and lighting circuit technology. However, since the surface area of the main body is reduced with the miniaturization of the bulb-type fluorescent lamp, the temperature of the arc tube tends to increase even when the calorific value of the arc tube is not excessively large. For this reason, in the case of a fluorescent lamp that lights in a high temperature environment, an arc tube, which is an alloy of mercury (Hg) with indium (In), lead (Pb), tin (Sn), bismuth (Bi), etc., is used as the arc tube. In order to be able to be sealed in, a technique is known in which a thin tube protrudes from the end of the arc tube into the base side space in the cover, the mercury vapor pressure is controlled to be optimal, and the luminous efficiency is improved (for example, patent document) 1).

  As another method, in order to form the coldest part in a part of the arc tube, a part of the arc tube and a metal base are connected by a heat transport medium such as a heat pipe to optimize the temperature. A technique is also known (for example, Patent Document 2).

JP 2004-146331 A JP 2000-11957 A

  By the way, the bulb-type fluorescent lamp described in Patent Document 1 requires an external appearance equivalent to an incandescent bulb, and in a smaller bulb-type fluorescent lamp such as a small incandescent bulb, the space in the base becomes a narrower space. It is difficult to extend the narrow tube in the base, and since they are close to each other, they are easily affected by heat from the lighting device.

  In addition, the light bulb shaped fluorescent lamp described in Patent Document 2 uses relatively expensive parts, leading to an increase in cost.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a light bulb-type fluorescent lamp capable of improving the rising characteristics of light flux with a simple configuration and a lighting fixture using the light bulb-type fluorescent lamp. .

  The bulb-type fluorescent lamp according to claim 1 is a light-emitting tube having a bent bulb; a lighting device that has a substrate and an electronic component mounted on the substrate and outputs high-frequency power to the light-emitting tube; A cover body having a holding part for holding the arc tube at the other end and in which a partition wall is formed between the projecting part and the lighting device in the base side space; And a projecting portion extending toward the base side.

  Since such a bulb-type fluorescent lamp is close to the size of a small incandescent bulb, the space inside the envelope covering the lighting device and the arc tube is a sealed narrow space, and since the heat capacity is reduced, the internal temperature is further increased. Tend to be. Even if a part of the arc tube constituting such a fluorescent lamp is extended toward the base side of the cover body, it is easily affected by the heat.

  Therefore, the present inventors proceeded with a study focusing on the temperature of the protruding portion of the arc tube during lighting in order to improve the luminous flux rising characteristics.

  For example, a bulb-type fluorescent lamp that has been reduced to the same size as an incandescent bulb having an E26 base can project a protrusion extending from the end of the bulb in the direction of the base, and the temperature of the cover body space is relatively low. It can extend to the space surrounded by the base. However, since the cover internal space is much narrower, the lighting device and the projecting portion are arranged close to each other. Therefore, it has been found that the thermal influence from the arc tube during lighting can be suppressed by extending the protruding portion, but the thermal influence from the lighting device tends to be received.

  Thus, in order to suppress the thermal effect from the lighting device, it is possible to reduce the temperature by about 10 ° C. by forming a partition wall that separates the lighting device from the protruding portion and suppressing the thermal effect from the lighting device. It was.

  The partition formed on the cover body may isolate the projection of the arc tube from the entire lighting device, or may be a partition that isolates the tip of the projection and a part of the lighting device. Absent. In short, the structure is not limited as long as a member that thermally shields between the lighting device and the protruding portion is interposed, so that the thermal influence from the lighting device can be suppressed.

  The bent bulb is formed in a U-shaped shape by heating and melting and bending the substantially central portion of a spiral glass bulb or a straight tubular glass bulb, or by molding the glass bulb. The bent valve does not need to be made of glass, and a translucent airtight container can be formed.

It is allowed to be formed of a material such as ceramics.

  A phosphor layer is applied directly or indirectly to the inner surface of the arc tube. Examples of the phosphor layer include, but are not limited to, rare earth metal oxide phosphors and halophosphate phosphors. However, in order to improve luminous efficiency, it is preferable to use a three-wavelength emission type phosphor in which phosphors emitting red, blue and green light are mixed.

  In the arc tube, electrodes are sealed at both ends of a discharge path formed in the arc tube. Examples of the electrode include a hot cathode made of a filament, a ceramic electrode carrying an electron emitting material, and a cold cathode made of nickel.

  A discharge medium is sealed inside the arc tube. The discharge medium is made of an inert gas such as argon, neon, krypton, or xenon and mercury.

  The substrate of the lighting device may be arranged vertically so as to be coaxial with the longitudinal direction of the bulb-type fluorescent lamp, or may be arranged horizontally so as to be orthogonal to the longitudinal direction of the bulb-type fluorescent lamp. Absent.

  In the case where the substrates are arranged horizontally, it is sufficient that the substrate covers a part of the imaginary surface formed by the end portions of the arc tube necessary for heat shielding, but all the end portions are on the substrate surface. A sufficient heat shielding effect can be obtained by arranging it so as to be covered.

  The lighting device is accommodated in the cover body. If the substrate of the lighting device is stored in the cover, either directly or indirectly with respect to the cover, and the main surface of the circuit board and the longitudinal direction of the arc tube are substantially orthogonal or parallel to each other I do not care.

  The protruding portion protrudes from the bulb end so as to communicate with the arc tube.For example, even if the diameter is the same as the inner diameter of the arc tube, the diameter is smaller than the arc tube, or a small diameter glass bulb, A thin tube may be sealed to the end of the arc tube. Furthermore, the part where the end of a part of the valve extends may be used for enclosing the main amalgam or may be used as an exhaust pipe.

  As the base, a screw-in type called an E-type for an incandescent lamp is usually used, but it is not limited to this. Further, the base need not be directly attached to the cover body, but may be indirectly attached to the case or a part of the cover body may constitute the base.

  The light bulb shaped fluorescent lamp according to claim 2 is characterized in that the substrate of the lighting device of the light bulb shaped fluorescent lamp according to claim 1 is arranged vertically so as to be parallel to the axial direction of the light bulb shaped fluorescent lamp.

  The substrate is formed in a substantially rectangular shape with a width dimension that allows it to be inserted vertically inside the base.

  Examples of the electronic component having a relatively large protruding height disposed on one surface of the substrate include a choke coil and a smoothing capacitor.

  On the other surface opposite to the one surface of the substrate, electronic components such as transistors, chip-type capacitors, rectifiers, and the like having a relatively low protruding height that allow the arrangement of the thin tubes may be mounted. It is preferable that a surface mounting type electronic component is mounted on the other surface. The surface mounting type electronic component means one that is led out from the component main body so that the lead wire extends substantially parallel to the mounting surface.

  The circuit board facing the partition wall is allowed not only to face the entire circuit board surface but also to have a part of the circuit board face the partition wall.

  The light bulb shaped fluorescent lamp according to claim 3 is characterized in that the amalgam accommodated in the protruding portion of the light bulb shaped fluorescent lamp according to claim 1 or 2 is opposed to the base side portion and the partition wall of the cover.

  The protrusion part which has enclosed the amalgam shows the area | region which adjoins the substantially cylindrical part for attaching the nozzle | cap | die which is the nozzle | cap | die space side of a cover, for example, and a substantially cylindrical part. Preferably, the one side perpendicular to the axial direction of the protruding portion is protruded from the cylindrical portion for attaching the base, or the portion facing the tip of the protruding portion is cut off. It is possible to efficiently dissipate the heat in the cover and to prevent the temperature from rising above a certain temperature during lighting. In short, it is not limited to these configurations as long as the metal cap and the tip of the protruding portion in which the amalgam is accommodated face each other.

  In addition, the other side perpendicular to the protruding portion axial direction of the projecting portion sealing the amalgam is that the partition wall is opposed to the partition wall only in the amalgam sealing portion if it is possible to suppress the direct influence of the heat of the lighting device. The structure and method are not limited.

  Note that it is possible to use an amalgam having a mercury vapor pressure immediately after lighting that is pure mercury or a vapor pressure close to that of pure mercury, but the enclosed mercury is not limited thereto. Further, the amalgam enclosed in the arc tube protrusion may be located near the end of the arc tube or near the middle of the protrusion extending to the base side. Means and the like are not particularly limited.

  When filling the amalgam, an auxiliary amalgam is usually placed in the arc tube in order to compensate for the diffusion of mercury vapor immediately after lighting. The present invention is applicable as long as the arc tube is configured under conditions that allow supply.

  The mercury vapor pressure characteristics of amalgam are determined by the composition and mercury content of the amalgam-forming metal. The most suitable amalgam-forming metals are bismuth (Bi), lead (Pb), zinc (Zn) and tin (Sn). ). Examples include bismuth (Bi) -tin (Sn) -mercury (Hg), bismuth (Bi) -tin (Sn) -lead (Pb) -mercury (Hg), and zinc (Zn) -mercury (Hg). However, it is not limited to this.

  The bulb-type fluorescent lamp according to claim 4 is a first amalgam composed of bismuth, tin, zinc and mercury, indium, bismuth, encapsulated in the bulb-type fluorescent lamp according to claim 3 It is characterized by comprising a second amalgam composed of tin, zinc and mercury.

  Even if each of the first amalgam and the second amalgam is encapsulated, the respective amalgams may be mixed and encapsulated as one amalgam. The mixing ratio of amalgam and mercury is not particularly limited.

  The lighting device according to claim 5 comprises: an appliance main body; a socket attached to the appliance main body; and the bulb-type fluorescent lamp according to any one of claims 1 to 4 connected to the socket. It is a feature.

  The instrument body is, for example, a downlight, but is not limited to this as long as the instrument body uses a general lighting bulb. As the socket, a screw-in type called E type is usually used, but the socket is not limited to this as long as it is a socket to which a general lighting bulb is attached.

  According to the bulb-type fluorescent lamp of the first aspect, by providing the partition wall that separates the protruding portion from the lighting device on the base side in the cover body, the thermal influence from the lighting device can be suppressed, and the temperature of the protruding portion is kept constant. It became possible. As a result, compared to the case of using a conventional amalgam having a low mercury vapor pressure, the light beam rise characteristic immediately after lighting is improved, and the light emission efficiency during lighting can be suppressed from being lowered.

  According to the light bulb shaped fluorescent lamp of claim 2, the circuit board is accommodated in parallel to the axial direction of the light bulb shaped fluorescent lamp, and the circuit board and the partition wall face each other, so that the lighting device and the protruding portion are close to each other. Even if it arrange | positions, it can suppress receiving the thermal influence from a lighting device directly.

  According to the bulb-type fluorescent lamp according to claim 3, since the protruding portion in which the amalgam is accommodated is opposed to the metallic base side portion and the partition wall of the cover body, it can efficiently dissipate heat from the metallic base portion. At the same time, the thermal influence from the lighting device can be suppressed.

  According to the bulb-type fluorescent lamp of claim 4, since lead is not used as the composition of the amalgam, it is an environment-friendly lead-less amalgam, and the same mercury vapor pressure characteristics as the lead-containing amalgam can be obtained. Light emission characteristics and luminous flux rise characteristics can be improved.

  According to the illuminating device of the fifth aspect, it is possible to provide a luminaire having the action of the bulb-type fluorescent lamp according to any one of the first to fourth aspects.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in several attached drawing.

  1 is a perspective view of a bulb-type fluorescent lamp according to a first embodiment of the present invention, FIG. 2 is a sectional view of the bulb-type fluorescent lamp shown in FIG. 1, and FIG. 3 is a part of the bulb-type fluorescent lamp of FIG. FIG. 4 is an enlarged sectional view, and FIG. 4 is a partially enlarged sectional view of the bulb-type fluorescent lamp of FIG.

  As shown in FIG. 1, a bulb-type fluorescent lamp 1 has a cover 3 having a base 2 at one end (upper end in FIG. 1) in the height direction (tube axis direction), and the other end (lower end in FIG. 1). The arc tube 4 supported on the side, the holder 5 attached to the cover 3 supporting one end side of the arc tube 4, the arc tube 4 is covered and the periphery of the holder 5 is also covered on one end side and attached to the cover 3. A lighting device 7 housed inside the globe 6, the base 2 and the cover 3 is provided. The bulb-type fluorescent lamp 1 is formed in a size and appearance close to those of a small light bulb for general illumination, such as an incandescent bulb having a rated power of 40 W type or 60 W type, for example.

  The base 2 is an Edison type E26 type or the like, and includes a cylindrical shell 2a having a thread and an eyelet provided on the top of one end of the shell 2a via an insulating portion 2b. The other end side of the shell 2 a is covered with one end portion of the cover 3 and fixed by an adhesive or caulking.

  The cover 3 is formed of a heat-resistant synthetic resin such as polybutylene terephthalate (PBT), for example. A cylindrical base mounting portion 3a to which the shell 2a of the base 2 is attached is formed on one end side, and the other end side is formed on the other end side. An expanded annular opening attachment end is formed, and a partition wall 3b is integrally formed at a position deviated from the maximum diameter of the opening of the base attachment part 3a in the cylindrical inner region inside the base attachment part 3a. .

  The lighting device 7 includes a substrate 7a, and a plurality of electronic components 7b constituting a lighting circuit are mounted on the substrate 7a. The substrate 7a is formed in a substantially rectangular shape having a width dimension that can be inserted into the base 2 and having a height that is longer than the width dimension, and both side edges of the substrate 7a are paired with a holder 5 (not shown). Are inserted into and engaged with the substrate mounting groove and are arranged vertically along the direction of the central axis of the holder 5 and are arranged at positions offset from the center line of the holder 5. That is, in a state where the base 2, the cover 3, and the holder 5 are combined, the substrate 7 a is arranged vertically along the direction of the center line of the base 2 with respect to the inside of the base 2, and Arranged at a position offset from the center line.

  The electronic component 7b is mounted on both sides of the substrate 7a, but the ballast choke as a current limiting inductor of the electronic component 7b is formed on one surface of the substrate 7a on the side that is wide with the base 2 and does not face the partition wall 3b. Large electronic parts such as transformer CT, capacitors, and electrolytic capacitors as smoothing capacitors are mounted. Further, the surface of the substrate 7a, which is close to the base 2 and opposite to the partition wall 3b, is a surface mount type such as a low-profile transistor, a chip-type capacitor, or a rectifier in the electronic component 7b. The electronic component 7b is mounted.

  The smoothing electrolytic capacitor is mounted so as to be perpendicular to the substrate 7a in the central region in the width direction of one surface of the substrate 7a. Thereby, the mounting efficiency of the board 7a is improved, and the board can be miniaturized.

  Further, a narrow tube 4a as a projecting portion enclosing the amalgam 8 is disposed in a space having a narrow interval surrounded by the partition wall 3b facing the other surface of the substrate 7a. Thereby, the lighting device 7 and the thin tube 4 a are efficiently arranged inside the base 2.

  The offset amount of the substrate 7 a with respect to the central axis of the base 2 is preferably in a range up to a position that is 3/4 of the inner diameter of the base 2. When the offset amount is closer to the inner surface of the base 2 than the position of 3/4, the width of the substrate 7a is reduced, the mounting area of the substrate 7a is reduced, and the mounting efficiency of the electronic component 7b is decreased. Absent.

  The cover body is mounted and fixed to a plurality of holder attachment end portions (not shown) to which the holder 5 is attached, on the annular opening attachment end portion.

  On the holder 5, a support recess and an insertion hole for placing and supporting the pair of electrode sealing ends 4 b of the arc tube 4 are formed, and the pair of electrode seals of the arc tube 4 are sealed in these insertion holes. The thin tubes 4a projecting outward from the end 4b are respectively inserted. Note that. The narrow tube 4a sealed by the electrode sealing end 4b extends linearly to the base 2 side.

  The arc tube 4 is formed on the inner surface thereof with a phosphor film made of rare earth metal oxide or the like over almost the entire length, and a pair of electrodes are respectively sealed at both ends in the axial direction, and an electrode sealing end 4b is formed. Each is formed.

  The arcuate tube spiral portion 4c includes a first swivel portion that turns from one electrode sealing end portion 4b of the arc tube 4 around the swivel axis to a turn-up portion that is a lower top end portion, and It has a double spiral shape having a second turning portion that reaches the other electrode sealing end portion 4b while turning around the turning axis from the other end.

  As the pair of electrodes, for example, a coil electrode made of tungsten is used, and is sealed to both ends of the arc tube 4 by crushing sealing, for example.

  A discharge medium such as argon or krypton gas is sealed in the arc tube 4.

  The amalgam 8 has, for example, an alloy composed of 40 to 60% by mass of bismuth (Bi) and 30 to 40% by mass of tin (Sn) as a base, and a mass of 5 to 25% by mass of mercury with respect to this alloy. The first amalgam 8a and an alloy composed of 50 to 70% by mass of bismuth (Bi), 6 to 9% by mass of zinc (Zn), and 20 to 40% by mass of indium (In) A second amalgam 8b having a mass of 18 mg containing 0 to 15% by mass of mercury is enclosed.

  In addition, without enclosing the first and second amalgams 8a and 8b separately, for example, bismuth (Bi) 13.7 mg, tin (Sn) 2.6 mg, zinc (Zn) 1.4 mg, indium (In) 5.4 mg, A mixture of two kinds of amalgam of 1.8 mg of mercury (Hg) may be enclosed.

  The globe 6 is formed of a material such as transparent or light diffusing glass or synthetic resin into a smooth curved surface close to the shape of a glass bulb of a general lighting bulb such as an incandescent bulb. Inside the opening attachment end of the cover 3 And is fixedly bonded with an adhesive such as silicone resin or epoxy resin.

  According to the bulb-type fluorescent lamp 1 configured in this way, by arranging the substrate 7a formed in a width dimension that can be inserted inside the base 2 in a vertical shape along the direction of the center line of the base 2, The tip end portion of the thin tube 4a of the arc tube 4 in which the amalgam 8 is sealed can be disposed between the base 2 and the substrate 7a, while reducing the thermal effect from the arc tube 4 during lighting on the amalgam 8, while reducing the base 2, the lighting device 7 and the thin tube 4a can be efficiently arranged, whereby the cover 3 can be reduced in size.

  Even if the thin tube 4a and the lighting device 7 are arranged close to each other, since the partition wall 3b is interposed between them, it is possible to suppress the amalgam 8 from being affected by the heat of the lighting device 7 during lighting. Further, since the shell 2a of the base 2 is opposed to the side opposite to the partition wall 3b side of the thin tube 4a, heat can be efficiently radiated.

  Further, since the substrate 7a is disposed at a position offset with respect to the center line of the base 2 and the thin tube 4a is disposed between the surface of the base 7a and the base 2 having a small distance from the base 2, the base 7a is connected to the base 2 of the base 7a. A large electronic component 7b can be arranged on the surface side with a wide space, the lighting device 7 and the thin tube 4a can be efficiently arranged inside the base 2, and the thermal effect of the lighting device 7 can be shielded by the partition wall 3b. As a result, the temperature of the amalgam 8 can be kept constant.

  In addition, even if an amalgam that does not contain a lead component is used, the same luminous flux maintenance and luminous flux rising characteristics as when lead is used can be maintained, so that consideration can be given to the environment.

  Furthermore, since the partition wall 3b is formed between the lighting device 7 and the thin tube 3a, it is possible to prevent the thin tube 3a and the amalgam 8 enclosed in the thin tube 3a from being directly affected by the heat from the lighting device 7 during lighting. Therefore, it is possible to use the amalgam 8 having a relatively high mercury vapor pressure, and the luminous flux rising characteristics can be improved. Furthermore, since the amalgam 8 encapsulated portion enclosed in the thin tube 3a is disposed opposite to the partition wall and the metal base 2, the heat radiation in the space in the cover 3 can be efficiently performed from the base 2 side. In order to further reduce the temperature of the amalgam 8 and the thin tube 3a, the thin tube 3a and the inner wall of the base 2 can be connected to each other by a heat conductive material or the like.

  FIG. 5 is a schematic configuration diagram of the illumination device 10 of the present invention. The lighting device 10 is a lighting device such as a downlight, for example, and includes a lighting fixture body 11. A socket 12 and a reflector 13 are attached in the luminaire main body 11, and the base 2 of the bulb-type fluorescent lamp 1 is attached to the socket 12 by screwing.

  According to this illuminating device 10, it is possible to provide a small illuminating device having a good luminous flux rise characteristic of the bulb-type fluorescent lamp 1.

The perspective view of the lightbulb-type fluorescent lamp which concerns on 1st Embodiment. Sectional drawing of the lightbulb-type fluorescent lamp shown in FIG. FIG. 3 is a partially enlarged cross-sectional view of the light bulb shaped fluorescent lamp of FIG. 2. FIG. 2 is a partially enlarged cross-sectional view of the light bulb shaped fluorescent lamp of FIG. 1. The schematic block diagram of the illuminating device which concerns on the 2nd Embodiment of this invention.

  DESCRIPTION OF SYMBOLS 1 ... Bulb type fluorescent lamp, 2 ... Base, 3 ... Cover, 4 ... Light-emitting tube, 5 ... Holder, 6 ... Globe, 7 ... Lighting device, 8 ... Amalgam, 3b ... Bulkhead ... 4a ... Thin tube, 10 ... Illumination device, 11 ... Lighting fixture body.

Claims (5)

An arc tube having a bent bulb;
A lighting device having a substrate and an electronic component mounted on the substrate and outputting high-frequency power to the arc tube;
A cover body provided with a base at one end and a holding part for holding the arc tube at the other end, and a partition wall is formed between the protrusion and the lighting device in the base side space;
A projecting portion extending from an end portion of a part of the bent valve toward the base in the cover body;
A bulb-type fluorescent lamp characterized by comprising:   2. The bulb-type fluorescent lamp according to claim 1, wherein the substrate of the lighting device is arranged vertically so as to be parallel to the axial direction of the bulb-type fluorescent lamp.   3. The light bulb shaped fluorescent lamp according to claim 1, wherein the amalgam accommodated in the projecting portion is opposed to the base side portion and the partition wall of the cover.   The said amalgam consists of a first amalgam composed of bismuth, tin, zinc and mercury and a second amalgam composed of indium bismuth, tin, zinc and mercury. Light bulb-type fluorescent lamp. An instrument body;
A socket attached to the instrument body;
A light bulb shaped fluorescent lamp according to any one of claims 1 to 4 connected to a socket.

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