JP2008270174A - Compact self-ballasted fluorescent lamp, and lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp capable of improving beauty of an appearance because a joint line of a globe is hardly seen, and facilitating assembly work; and a manufacturing method thereof. <P>SOLUTION: This compact self-ballasted fluorescent lamp is provided with: a cover 3 having a mounting end 3b on the side opposite to one end for arranging a base thereon; a globe 6 divided in a direction orthogonal to an axis to be divided into an under globe 6X2 and a top globe 6X1, having fitting parts fitted to each other in a joint part of the division, and formed by fixing the fitting parts by ultrasonic welding or vibration welding; an arc tube 4 housed in the globe, and formed into a spiral shape; and a lighting device 7 housed in the cover. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bulb-type fluorescent lamp and an illumination device including the bulb-type fluorescent lamp.

  Conventionally, this type of bulb-type fluorescent lamp has been miniaturized to a size close to that of a general illumination bulb defined in JIS, and has an appearance similar to that of a general illumination bulb.

  This type of bulb-type fluorescent lamp includes a light-emitting tube having a bent bulb, a cover that attaches a base to one end of a cover body and supports the light-emitting tube at the other end, a lighting device that is accommodated in the cover, and a light-emitting tube. A glove or the like that covers and is attached to the other end of the cover is provided (see, for example, Patent Document 1).

In recent years, there has been proposed one in which a bent bulb disposed in a narrow space in a globe is formed in a spiral shape to increase the discharge path length (see, for example, Patent Documents 2 and 3). .
JP 2000-21351 A JP 2003-263972 A JP 2003-31179 A

  However, in such a conventional spiral light bulb-type fluorescent lamp, the globe accommodating the arc tube has a spherical portion and a reduced diameter portion smaller in diameter than the spherical portion, which are integrated into a bulb shape. On the other hand, since the arc tube has a spiral portion whose diameter is larger than that of the reduced diameter portion of the globe, the arc tube cannot be inserted into the inside of the reduced diameter opening end portion of the globe.

  Therefore, the globe is divided into right and left along the axial direction (longitudinal direction), these are butted from the left and right of the arc tube, and the butted portions of the left and right globes are bonded to each other with the arc tube accommodated inside. It is possible to divide vertically by joining together.

  However, with this vertical division, when the bulb-type fluorescent lamp is turned on, the linear seam is conspicuous and the shadow is projected when viewed from the top end side opposite to the base side. There is a problem that damages. Also, in the vertical division, the vertical division line is divided into left and right because the curvature changes greatly from the reduced diameter part of the bulb-shaped glove to the reduced diameter part through the maximum diameter part and then back again. In addition, misalignment tends to occur at the time of abutting between the separated glove pieces, and when performing ultrasonic welding or vibration welding along this vertical dividing line, the vertical dividing line whose curvature varies greatly along the curved surface of the glove It is necessary to apply ultrasonic waves or vibrations while maintaining a predetermined distance along, and it is not easy to maintain the predetermined distance over almost the entire length of the dividing line. For this reason, uniform ultrasonic irradiation is not easy. Furthermore, since this ultrasonic irradiation is generally in a cantilever state in which one end portion on the base side is supported and fixed, there is a problem that misalignment between the pair of left and right glove pieces is likely to occur and the yield is low. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bulb-type fluorescent lamp and an illumination device that can improve the appearance of the appearance with less noticeable glove seams and can be easily assembled. And

  The bulb-type fluorescent lamp according to claim 1, wherein a cap is disposed on one end side, and a cover having an attachment end and a locking portion on the other end side; on an opening end side attached to the attachment end of the cover, A diameter-reduced portion that is smaller than the maximum diameter portion on the top end side of the other end is formed, and is divided along the axis orthogonal direction so as to be divided into at least two portions on the reduced-diameter portion side and the top end side, The split joint has a fitting part that fits to each other, and a glove formed by fixing the fitting part by ultrasonic welding or vibration welding; and a spiral having a pair of electrodes accommodated in the glove An arc tube formed in a shape; and a lighting device housed in the cover.

  The bulb-type fluorescent lamp according to claim 2 is characterized in that the split joint portion is formed by a maximum diameter portion of the globe.

  The bulb-type fluorescent lamp according to claim 3 is characterized in that the split joint portion is formed at a position where the fitting portion is displaced to the outer surface side from the middle position in the thickness direction of the globe.

  In the bulb-type fluorescent lamp according to claim 4, the split joint portion is formed on the inner surface side of the globe with respect to the weld portion where the fitting portion melts and welds the globe joint surfaces to the outer surface of the globe. And a gap between the globe joint surfaces formed.

  The lighting device according to claim 5 comprises: a lighting fixture body; a socket attached to the lighting fixture body; and the bulb-type fluorescent lamp according to any one of claims 1 to 4 attached to the socket. It is characterized by being.

  According to the bulb-type fluorescent lamp of the first aspect, since the globe is divided in the horizontal direction (horizontal direction) along the direction perpendicular to the axis perpendicular to the central axis (vertical axis), the globe is viewed from the top end side of the globe. In this case, the joining line of the dividing line seam is not visible, so that the appearance can be improved, and the shadow of the joining line is hardly projected at the time of lighting, so that the appearance during lighting can be improved.

  Moreover, since the fitting part is formed in each joining part, such as the joining surface of a parting line, it can be joined concentrically easily and quickly by fitting these fitting parts to each other. Misalignment can be prevented or reduced.

  And in the state where the fitting parts are fitted to each other in this way, when fixing the whole circumference of the dividing line joint part by ultrasonic welding or vibration welding, the dividing line joint part is the direction orthogonal to the axis of the globe, that is, , The curvature on the horizontal dividing line is substantially constant over the entire circumference. For this purpose, by simply rotating the bulb-type fluorescent lamp relative to the position where the ultrasonic wave or vibration is applied, the distance between the ultrasonic wave or vibration irradiation position and the dividing line junction is changed. It can be easily held almost constant over the entire circumference.

  For this reason, since the added energy of the ultrasonic wave or the vibration applied to the dividing line joint can be made substantially uniform over the entire circumference, it is possible to reduce the welding variation of the dividing line joint.

  Also, since the dividing line of the globe is a horizontal dividing line, both ends in the axial direction of the bulb-type fluorescent lamp, that is, one end on the base side and the top end of the globe are pressed inward in the axial direction during ultrasonic welding or vibration welding. In addition to facilitating the support, the pressure distribution in the axial direction on the dividing line joint surface can be distributed almost uniformly in the circumferential direction. For this reason, the dispersion | variation in the adhesion strength by ultrasonic welding or vibration welding in these joining surfaces can be reduced. For this reason, the efficiency of the assembly workability of the bulb-type fluorescent lamp can be improved, and the yield can be improved. Furthermore, since the joint is integrally melted and fixed by ultrasonic welding or vibration welding, the light transmittance of the joint can be maintained at substantially the same level as the other parts.

  Furthermore, since the arc tube accommodated in the globe has a spiral shape such as a double helix, and the globe is formed so as to be capable of being divided horizontally, the arc tube has a spiral outer diameter that is smaller than the reduced diameter opening end diameter of the globe. Even when a large bulging part is formed, a spiral arc tube can be easily accommodated in the glove by forming a horizontal dividing line of the glove at a part corresponding to the maximum outer diameter part of the bulging part. Can do. For this reason, assembly workability and yield of the bulb-type fluorescent lamp can be improved.

  Further, if a bulging portion having a spiral diameter larger than the diameter-reduced opening end of the globe is formed in this arc tube, the discharge path length can be made longer and the luminous flux can be further increased.

  Furthermore, when the arc tube has a spiral shape such as a double spiral shape, a dividing line junction is formed at the maximum diameter portion of the globe corresponding to the maximum diameter portion where the diameter of the arc tube spiral shape is maximum. Therefore, even if a bulging portion having a spiral diameter larger than the diameter of the reduced diameter opening end of the globe is formed in the spiral arc tube, and the discharge path length is extended, the spiral arc tube is placed in the globe. Can be easily accommodated. For this reason, the efficiency and yield of assembly workability of the bulb-type fluorescent lamp can be increased.

  According to the electrode-type fluorescent lamp of claim 3, when the fitting portion of the globe joint surface is melted by ultrasonic vibration or the like, the melt extends to the outer surface side of the globe and solidifies by cooling, and the globe joint surfaces are welded together. A welded part is formed.

  In addition, since this welded portion extends to the outer surface side of the globe, a part of the welded portion may protrude to the outer surface side of the globe during melting and a flash may be formed. If a flash is formed on the inner surface side of the globe joint surface, since the arc tube is already accommodated in the globe at a high density, there is almost no space for removing the inner flash in the globe. . For this reason, it is not easy to remove the inner flash. However, in the present invention, since the flash is formed on the outer surface side of the globe, the flash on the outer surface side of the globe can be easily removed.

  According to the electrode type fluorescent lamp of the fourth aspect, since the gap is formed on the inner surface side of the globe joint surface, even if a part thereof flows to the inner surface side of the globe when the fitting portion melts, The flow can be stopped in the gap. For this reason, it can prevent or reduce reliably that a beam protrudes from the glove inner surface.

  According to the illuminating device according to claim 5, since the light bulb shaped fluorescent lamp according to any one of claims 1 to 4 is provided, it is possible to provide an illuminating device having the effects of these light bulb shaped fluorescent lamps. .

  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.

  FIG. 1 is a front view showing a part of the bulb-type fluorescent lamp according to the first embodiment of the present invention in a vertical section, and FIGS. 2A and 2B are horizontal dividing lines (horizontal division) of the globe shown in FIG. Line) It is the elements on larger scale of a junction part.

  As shown in FIG. 1, a bulb-type fluorescent lamp 1 has a cover 3 provided with a base 2 at one end (lower end in FIG. 1) in the height direction (tube axis direction), and the other end (upper end in FIG. 1). The arc tube 4 supported on the side, the holder 5 attached to the cover 3 that supports one end side of the arc tube 4, and the globe that covers the arc tube 4 and covers the periphery of the holder 5 on the lower end side and is attached to the cover 3 6. A lighting device 7 housed inside the base 2 and the cover 3 is provided. And the rated electric power is formed in a size and appearance close to those of general lighting bulbs such as incandescent bulbs of 40W type, 60W type, and 100W type. This general lighting bulb is defined in JIS C 7501.

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

  The cover 3 is a cover in which, for example, an inverted frustoconical portion that is gradually reduced in diameter downward in FIG. 1 by a heat-resistant synthetic resin such as polybutylene terephthalate (PBT) and a cylindrical portion that hangs downward are integrally formed. A shell 2a of the base 2 is attached to one end (lower end in FIG. 1) side of the cover body 3a, and an attachment end portion is attached to the other end side (upper end side in FIG. 1) of the cover body 3a. A cylindrical opening mounting end 3b is formed.

  In this attachment end 3b, the lower cylindrical opening end of the holder 5 is placed and fixed on the annular convex step portion 3c inside the connecting portion between the truncated cone portion and the cylindrical portion of the cover body 3a. ing. Further, in the vicinity of the convex stepped portion 3c, it is engaged with and fixed to a cover engaging portion 5f having a bowl-shaped cross section projecting from the lower end of the opening of the holder 5 in the drawing, and its axial direction (up and down in FIG. 1). 3 d of engagement recessed parts which regulate the displacement of (direction) are formed.

  The holder 5 is formed, for example, with a heat-resistant synthetic resin such as PBT in a closed cylindrical shape with a lower end opening, and one end (the lower end in FIG. 1) is provided at the peripheral edge of the lower surface of the disk-shaped substrate portion 5a forming the lid. A cylindrical holder body having a lower surface opening in FIG. 2 is formed by integrally connecting cylindrical cylindrical portions 5b protruding to the side. Then, the lower end of the opening of the cylindrical portion 5b in FIG. 1 is placed on the convex step portion 3c of the cover main body 3a and fixed with an adhesive or the like.

  The holder 5 protrudes into a gap between the electrode sealing end portions 4a and 4b and a supporting recess for placing and supporting the pair of electrode sealing end portions 4a and 4b of the arc tube 4 on the substrate portion 5a. A cylindrical protrusion 5c that restricts the radial displacement is provided. The substrate portion 5a is formed with insertion holes 5d and 5e on the outside of the cylindrical projection 5c, and the insertion holes 5d and 5e are formed from a pair of electrode sealing end portions 4a and 4b of the arc tube 4, respectively. A short thin tube 4c, a long thin tube 4d, and an outer wire (not shown) are inserted through the outer thin tube 4b.

  As shown in FIG. 2, the holder 5 has a cover engaging portion 5 f that protrudes outward in the horizontal direction on the outer peripheral surface of the cylindrical portion 5 b, and a glove locking portion on the upper side in FIG. 2. The upper protrusion 5g and the lower protrusion 5h that protrude outward in the horizontal direction are integrally provided.

  The lower protrusion 5h places the reduced diameter opening end 6d of the globe 6 to position the holder 5 and the globe 6, and supports the load of the globe 6 when the globe 6 is upward in the gravity direction. It is.

  The upper protrusion 5g has the tip of the outer peripheral surface abutted against the inner peripheral surface of the engagement step portion 6b2 formed at the reduced diameter side opening end 6b of the globe 6 so that the globe 6 does not fall off the holder 5. The globe 6 is pressed and supported in the diameter direction.

  The lower protrusion 5h may be provided in an annular shape by an outwardly projecting flange or the like, or may be a protrusion disposed at a required pitch in the annular circumferential direction. The upper protrusion 5g is provided at the tip of a tongue piece that is elastic and swingable. The tongue piece is formed integrally with the cylindrical portion 5b of the holder 5 by forming a slit so as to remove a portion corresponding to the fulcrum.

  As shown in FIG. 1, the globe 6 is made of a glass bulb of a general lighting bulb such as an incandescent bulb by a transparent or light diffusing synthetic resin having a thickness of, for example, 1 to 2 mm (eg, polycarbonate, acrylic, polyethylene, etc.). It is formed in a smooth curved surface close to the shape. That is, the globe 6 has a spherical portion 6a formed in a substantially spherical shape, and a substantially cylindrical reduced diameter that is gradually reduced in diameter to the lower end of the spherical portion 6a in FIG. The parts 6b are integrally coupled. The spherical portion 6 a has a maximum diameter portion 6 c that indicates the maximum diameter of the globe 6. The reduced diameter portion 6b is formed with a reduced diameter opening end portion 6d at one end portion (lower end portion in FIG. 1) of the globe 6, and an edge portion of the opening end portion 6d is fitted inside the opening mounting end portion 3b of the cover 3. For example, they are bonded and fixed by an adhesive such as silicone resin or epoxy resin.

  The globe 6 is divided into two in the direction orthogonal to the central axis O of the arc tube 4 and the bulb-type fluorescent lamp 1, that is, the globe 6 is divided into two in the lateral direction (horizontal direction). That is, the globe 6 is divided into two in the vertical direction in FIG. 1 by using the horizontal center line Oa of the maximum outer diameter portion 4k of the arc tube 4 as a horizontal dividing line, and the top globe 6X1 on the top end portion 6a side is reduced in diameter. It is divided into an underglove 6X2 on the part 6b side.

  That is, when the globe 6 is formed of, for example, an undivided integral, the outer diameter of the maximum outer diameter portion 4k of the arc tube 4 is larger than the reduced diameter opening end portion 6d of the globe 6, The arc tube 4 cannot be inserted into the globe 6 through the opening end 6d.

  However, since the globe 6 is horizontally divided into an under globe 6X1 and a top globe 6X2 by the horizontal dividing line Oa, after the arc tube 4 is erected on the holder 5, the arc tube 4 The outer side can be covered with the under glove 6X2 and the top glove 6X1 from both the upper and lower sides, and the butted surfaces 6X1a and 6X2a at the open ends of the two globes 6X1 and 6X2 can be fixed together by ultrasonic welding to be integrally formed.

  That is, since the horizontal dividing line Oa coincides with the horizontal center line Oa of the maximum outer diameter portion 4k of the arc tube 4, the entire arc tube 4 is covered with the pair of upper and lower undergrooves 6X2 and top glove 6X1. Can do.

  Then, as shown in FIG. 2A, the globe 6 includes a fitting portion 6X1b that fits to the joint surface 6X1a of the top glove 6X1 and the joint surface 6X2a of the underglove 6X2 along the horizontal dividing line Oa. , 6X2b are formed over substantially the entire circumference of the horizontal dividing line Oa.

  That is, the top glove 6X1 is formed by dividing the fitting protrusion 6X1c having a rectangular cross-section projecting toward the underglove 6X2 side (downward in FIG. 2A) on the inner side in the thickness direction of the joint surface 6X1a. It protrudes integrally over the entire circumference of Oa.

  On the other hand, the underglove 6X2 has a fitting groove 6X2c having a rectangular cross section fitted to the fitting protrusion 6X1c of the top glove 6X1 on the inner side in the thickness direction of the joint surface 6X2a. It protrudes integrally over the entire area.

  These fitting portions 6X1b and 6X2b are irradiated with ultrasonic waves for a predetermined time at a predetermined distance from the outer peripheral side in the fitted state. Thereby, at least a part of the fitting portions 6X1b and 6X2b is melted and fixed to each other. The inner ridge 6X1c and the inner fitting groove 6X2c for fitting may be turned upside down or inside and outside. That is, the inner ridge 6X1c may be formed on the underglove 6X2 side, and the inner fitting groove 6X2c may be formed on the top glove 6X1 side. Further, these fitting portions 6X1b and 6X2b may be formed on the outer side in the thickness direction of the globe 6.

  Further, the fitting portions 6X1b and 6X2b of the globe 6 may be configured as shown in FIG. That is, at the substantially middle portion in the thickness direction of the joint surface 6X1a of the top glove 6X1, a protruding protrusion 6X1d having a semicircular cross-sectional shape, for example, is integrally projected over the entire circumference of the horizontal dividing line Oa. A fitting groove 6X2d having an arcuate cross section that fits into the ridge 6X1d may be formed. However, the fitting protrusion 1d may be provided on the underglove 6X2 side, and the fitting groove 6X2d may be provided on the top glove 6.

  Further, the fitting portions 6X1b and 6X2b of the globe 6 may be configured as shown in FIG. That is, the substantially triangular fitting protrusion 6X1e having a sharp tip end in the thickness direction of the joint surface 6X1a of the top glove 6X1 is integrally projected over the entire circumference of the horizontal dividing line Oa. A substantially trapezoidal fitting groove 6X2e whose cross section fitting to the triangular fitting convex stripe 6X1e expands upward in the drawing may be formed in the underglove 6X2.

  The trapezoidal fitting groove 6X2e is formed so that the groove depth is smaller than the protruding height of the triangular fitting protrusion 6X1e. Further, the triangular fitting protrusion 6X1e may be provided in the underglove 6X2, and the fitting groove 6X2e may be provided in the top glove 6X1.

  That is, the fitting portions 6X1b and 6X2b of the globe 6 may be configured so that the joint surface 6X1a of the top glove 6X1 and the joint surface 6X2a of the underglove 6X1 can be appropriately fitted.

  The arc tube 4 has a spiral portion 4e as an upper bulging portion in FIG. 1 and a lower straight portion 4f, which are integrally connected.

  The spiral portion 4e is formed by bending a straight circular glass bulb 4g having an outer diameter of, for example, 10 mm into almost equal folds, and winding the folded portion 4h at the equally divided position around a die (not shown). It is formed by molding into a double helix.

  The glass bulb 4g has a phosphor film such as a rare earth formed on the inner surface thereof over almost the entire length, and a pair of electrodes 4i and 4j are sealed at both ends in the axial direction, respectively, and electrode sealing end portions 4a and 4b. Respectively.

  That is, as shown in FIG. 1, the spiral-shaped portion 4e is turned to one electrode sealing end portion of the glass bulb 4g, for example, the turn-up portion 4h that is the top end portion in FIG. It has a double spiral shape having a first swivel portion that reaches the other swivel portion 4h and a second swivel portion that swivels around the swivel axis O and reaches the other electrode sealing end portion, for example, 4b. The required number of turns, for example, almost 3 turns (number of turns). Accordingly, the spiral portion 4e is formed in a dense pitch portion having a dense spiral pitch, and is formed in a long discharge path portion having a long discharge path length. The folded portion 4h, which is the top end portion of the spiral portion 4e, is formed in a bulging portion whose diameter is larger than the diameter of the first and second swivel portions, and the coldest portion is formed in the bulging portion. You may form so that.

  As the pair of electrodes 4i and 4j, for example, a coil electrode made of tungsten is used. For example, the electrodes 4i and 4j are sealed at both ends of the glass bulb 4g while being temporarily fixed with bead glass.

  A discharge medium such as argon or krypton gas is sealed in the glass bulb 4g, and a short thin tube 4c and a long thin tube 4d communicating with the inside of the pair of electrode sealing end portions 4a and 4b project. It is installed. Mercury or amalgam is accommodated in the narrow tube 4d.

  The spiral portion 4e as the bulging portion is accommodated in the spherical portion 6a on the top end 6d side having the maximum diameter portion 6c of the globe 6, and the spiral diameter corresponds to the inner shape of the spherical portion 6a of the globe 6. The diameter gradually increases from the folded portion 4h at the top end toward the maximum diameter portion 6c, the spiral diameter is maximized at the maximum diameter portion 6c of the globe 6, and further, the diameter of the lower half of the spherical portion 6a of the globe 6 is reduced. Then, the spiral diameter is gradually reduced, and the straight portion 4f is integrally coupled to the upper end portion in FIG.

  The straight portion 4f is a pair of spiral terminal portions of the spiral-shaped portion 4e, and the lower portion of the glass bulb 4g on the side of the pair of electrode sealing end portions 4a and 4b in FIG. The pair of straight electrode sealing ends 4a and 4b are arranged in parallel in parallel and inserted into the supporting recess of the holder 5. The valve outer diameter C of the straight portion 4f is formed to be 7 to 9 mm, and is smaller than the valve outer diameter D (for example, 8 to 10 mm) of the spiral portion 4e. The straight portion 4f may be formed in a spiral shape by slightly curving the glass bulb 4g so as to match the turning direction of the spiral portion 4e.

  In the lighting device 7, the vertical substrate 7 a on which the lighting circuit pattern is formed is fitted and fixed in a pair of vertical grooves (not shown) on the inner surface of the holder 5. That is, the holder 5 forms a pair of longitudinal grooves (not shown) opposed to each other in the diameter direction on the inner surface of the cylindrical portion 5b in the axial direction of the holder 5, and the width direction of the longitudinal substrate 7a is formed in the longitudinal groove. Both side edges are fitted and fixed. The vertical substrate 7a is configured as a single-sided or double-sided substrate, and a plurality of electronic components 7b, 7b,... That are lighting circuit components such as lead components such as electrolytic capacitors and chip components such as transistors are mounted on the mounting surface. Yes.

  An example of a specific configuration of the bulb-type fluorescent lamp 1 configured as described above is as follows. That is, the arc tube maximum outer diameter (spiral outer diameter) of the arc tube 4 is 54 mm, the total height h1 of the bulb-type fluorescent lamp 1 is 109 mm, the height h2 of the arc tube 4 is 64 ± 1 mm, and the horizontal center of the maximum diameter portion 4 The height h3 to the line Oa is 38 mm, the diameter r1 of the largest diameter portion 6c of the globe 6 from the electrode sealing end of the arc tube 4 is 60 mm, and the upper end outer diameter r2 of the cover 3 in FIG. The discharge path length between the pair of electrodes 4i and 4j is 360 to 610 mm, and differs depending on the bulb diameter of the glass bulb 4g. For example, when the diameter (bulb diameter) of the glass bulb 4g is 8 mm, the discharge path length is 476 mm, and when the bulb diameter is 9 mm, the discharge path length is 374 mm. Further, the outer diameter of the base 2 is 26 mm, which is about 1.17 times the maximum outer diameter (30.5 mm) of the arc tube.

  Therefore, according to this bulb-type fluorescent lamp 1, it is possible to obtain an appearance similar to a general lighting bulb.

  Further, since the spiral portion 4e of the arc tube 4 is accommodated in a relatively large-capacity spherical portion 6a including the maximum diameter portion 6c of the globe 6, both the bulb diameter and the spiral diameter can be increased. it can. For this reason, since the discharge path length of the spiral portion 4e can be extended, it is possible to both increase the luminous flux and improve the light emission efficiency in the spiral portion 4e.

  Further, the straight portions 4f and 4f of the arc tube 4 accommodated in the narrow reduced diameter portion 6b side of the globe 6 have a bulb outer diameter C smaller than the bulb outer diameter D of the spiral portion 4e. A gap around the straight portions 4f and 4f in the reduced diameter portion 6b can be increased. For this reason, it is possible to reduce the amount of light that is emitted from the spiral portion 4e and the straight portions 4f and 4f by the straight portions 4f and 4f themselves. Thereby, luminous efficiency can be improved.

  Further, in the spiral portion 4e, since both the bulb diameter and the spiral diameter can be increased, the ease of molding the glass bulb 4g into a spiral shape by molding using a mold can be improved. , Cracks and distortion during the spiral molding can be reduced. As a result, both the mass productivity and the yield of the glass bulb 4g having the spiral portion 4e can be improved.

  In addition, since the bulb diameter of the spiral portion 4e that shares most of the discharge path length as the arc tube 4 is large, the starting voltage and the lamp voltage of the arc tube 4 can be reduced. For this reason, it is not necessary to increase the output voltage of the lighting device 7, and the pressure resistance of the parts used can be reduced. Therefore, the cost can be reduced, and further, the lighting device 7 can be prevented from being enlarged. Or it can be suppressed.

  Further, since the spiral portion 4e of the arc tube 4 forms the glass bulb 4g in a spiral shape, the light emitted inside the spiral portion 4e is shielded by the inner surface of the spiral glass bulb 4g itself. The luminous flux radiated to the outside of the spiral portion 4e is reduced, but the straight portion 4f extends in the axial direction within the reduced diameter portion 6b of the globe 6 and the valve outer diameter C is also reduced. Since it is thin, there are few parts light-shielded by the straight parts 4f and 4f. For this reason, the light flux emitted from the inside of the spiral part 4e and the inside of the straight part 4f to the outside from the reduced diameter part side (lower side in FIG. 1) of the globe 6 can be increased.

  According to the bulb-type fluorescent lamp 1, the globe 6 is divided by the horizontal dividing line Oa along the direction perpendicular to the axis orthogonal to the central axis (vertical axis) O, so when viewed from the top end side, The joining line of the dividing line seam is not visible, so that the appearance can be improved, and the joining line shadow becomes difficult to be projected, so that the appearance during lighting can be improved.

  Since the joint portions 6X1b and 6X2b are formed at the joint portions of the joint surfaces 6X1a and 6X2a of the horizontal dividing line Oa, the joint portions 6X1b and 6X2b can be easily and concentrically fitted together. They can be fitted, and misalignment of the joint surface can be prevented or reduced.

  When the entire peripheries of the fitting portions 6X1b and 6X2b of the horizontal dividing line Oa are fixed by ultrasonic welding or vibration welding, the dividing line joining portion is in the direction orthogonal to the axis of the globe 6, that is, in the lateral direction (horizontal direction). Therefore, the curvature on the horizontal dividing line Oa is substantially constant over the entire circumference. For this purpose, by simply rotating the bulb-type fluorescent lamp 1 relative to the ultrasonic wave or vibration application position around its central axis, the distance between the ultrasonic wave or vibration application position and the horizontal dividing line junction is obtained. It can be easily held almost constant over the entire circumference.

  For this reason, since the amount of irradiation (addition) of the ultrasonic wave or vibration applied to the horizontal dividing line joint can be made substantially uniform over the entire circumference, variation in welding at the horizontal dividing line joint is reduced. be able to.

  Further, since the dividing line of the globe 6 is a horizontal dividing line, at the time of ultrasonic welding or vibration welding, both ends in the axial direction of the bulb-type fluorescent lamp 1, that is, one end on the base side and the top end of the spherical portion 6a of the globe 6 Can be clamped so as to be pressed inward in the axial direction, and the support thereof is facilitated, and the axial pressure distribution on the horizontal dividing line joint surfaces 6X1a and 6X2a can be distributed almost uniformly in the circumferential direction. it can. For this reason, the dispersion | variation in the adhesion strength by ultrasonic welding in these joining surfaces 6X1a and 6X2a can be reduced. For this reason, the efficiency of the assembly workability of the bulb-type fluorescent lamp can be improved, and the yield can be improved. Furthermore, since the fitting portions 6X1b and 6X2b are integrally melted and fixed by ultrasonic welding or vibration welding, the light transmittance of the joint portion can be maintained at substantially the same level as the other portions.

  Further, since the horizontal dividing line Oa is formed at the maximum diameter portion of the globe 6 corresponding to the maximum diameter portion where the spiral diameter of the arc tube 4 is the maximum, Even if the maximum diameter portion 4K of the bulging portion having a spiral shape larger than the diameter of the reduced diameter opening end 6d is formed to extend the discharge path length, the spiral arc tube 4 can be easily placed in the globe 6. Can be accommodated. For this reason, the efficiency of the assembling workability of the bulb-type fluorescent lamp 1 can be increased.

  In the above embodiment, the case where the globe 6 is formed of resin has been described. However, the present invention is not limited to this, and may be formed of glass, for example. In this case, an acrylic resin or a silicone resin containing an ultraviolet absorber may be applied to the inner surface of the glass globe 6. As the ultraviolet absorber, a combination of one or more of titanium oxide (Ti), zinc oxide (Zn), iron oxide (Fe), and cerium oxide (Ce) is desirable.

  Furthermore, when the globe 6 is made of a transparent resin, an ultraviolet absorbing material may be mixed with the light diffusing material and applied. According to this, the discoloration and deterioration of the resin due to ultraviolet rays can be prevented or reduced, and light diffusibility can be imparted.

  Furthermore, an ultraviolet absorber may be applied to the inner surface or the outer surface of the arc tube 4. When an ultraviolet absorber is applied to the inner surface of the arc tube 4, first, a protective film such as silica or alumina oxide is formed on the inner surface of the glass of the arc tube 4, and then an ultraviolet absorber is applied on the protective film, Further, a phosphor film may be formed on the ultraviolet absorber film. Alternatively, only the ultraviolet absorbing material may be applied, and the phosphor film may be formed thereon. According to this, the reaction between the silica component precipitated from the glass of the arc tube 4 and mercury can be suppressed by the protective film, and ultraviolet rays can be efficiently absorbed by the ultraviolet absorber film.

  FIG. 3 is a schematic configuration diagram of the illumination device 11 according to the second embodiment of the present invention. The lighting device 11 is a lighting device such as a downlight, for example, and includes a lighting fixture body 12. A socket 13 and a reflector 14 are attached in the luminaire main body 12, and the base 2 of the bulb-type fluorescent lamp 1 is attached to the socket 13 by screwing.

  According to this illuminating device 11, since the high luminous flux and high luminous efficiency spiral portion 4e of the bulb-type fluorescent lamp 1 faces downward in FIG. 4, the illuminance directly below can be improved.

  Further, since the straight portion 4f that increases the luminous flux radiated to the base 2 side of the bulb-type fluorescent lamp 1 is located on the reflector 14 side of the luminaire main body 12 and faces the reflector 14, it is reflected by the reflector 14. The reflected light can be increased.

  Since the globe 6 is divided horizontally, when this bulb-type fluorescent lamp 1 is used as a downlight, there is no seam (joint portion) on the top end surface of the top globe 6X1 facing downward in the drawing. Therefore, it is possible to improve the appearance of the appearance and to reduce the appearance of the dividing line when it is turned on. Furthermore, since the seam (joint part) is fixed by ultrasonic welding, and the light transmittance at the fixed part is substantially the same as that of other parts, it is possible to prevent the joint line from being projected onto the illuminated surface. Can do.

  FIG. 4 shows a state after the entire peripheries of the fitting portions 6X1b and 6X2b of the top glove 6X1 and the underglove 6X2 shown in FIGS. 2A, 2B and 2C are welded by ultrasonic welding or vibration welding, respectively. The longitudinal section of the welding part Ya and its periphery is shown.

  As shown in FIG. 4, the welded portion Ya is formed around the thickness vertical center line Ob passing in the vertical direction through an equally divided position that equally divides the thickness t of the top glove 6X1 and the underglove 6X2. / 3 or more, or 0.5 mm or more, sufficient bonding strength is ensured.

  Further, minute gaps ga and gb which are not welded are formed on the left and right in FIG. 4 of the welded portion Ya, that is, on the outer surface side and the inner surface side of the globe 6.

  FIG. 5 is a front view showing a part of the outer surface of the globe 6 cut away when the minute gaps ga and gb are formed on both sides of the welded portion Ya, that is, on the inner surface side and the outer surface side of the globe 6 as described above. is there.

  As shown in FIG. 5, two upper and lower divided seam lines c and d are projected on the outer surface of the globe 6 along the horizontal dividing line Oa. When the bulb-type fluorescent lamp 1 is turned on, the divided seam lines c and d are projected. A new problem has been discovered that is more conspicuous and lowers the aesthetic appearance.

  Therefore, in order to solve this new problem, the inventors have invented a configuration of new fitting portions 6X1b and 6X2b of the top glove 6X1 and the underglove 6X2.

  FIG. 6 is a partially enlarged longitudinal sectional view showing an example of the structure of the new fitting portions 6X1b and 6X2b. FIG. 7 is a view after the fitting portions 6X1b and 6X2b are welded over the entire circumference by ultrasonic welding or vibration welding. It is a partial expanded longitudinal cross-sectional view.

  The fitting portions 6X1b and 6X2b of the globe 6 shown in FIG. 6 include a triangular fitting protrusion 6X1e shown in FIG. 2C and a trapezoidal fitting groove 6X2e that is fitted to the triangular fitting protrusion 6X1e. 6 is characterized in that it is provided at a position displaced by a predetermined distance from the thickness vertical center line Ob of both the joint surfaces 6X1a and 6X2a toward the outer surface side of the globe 6.

  That is, the fitting portions 6X1b and 6X2b of the globe 6 are provided with a triangular fitting protrusion 6X1e projecting toward the joining surface 6X2a of the other underglove 6X2 on one joining surface, for example, the joining surface 6X1a of the top glove 6X1. The center is formed in an annular shape over the entire circumference of the joint surface 6X1a at a position corresponding to the fitting center line Ob displaced by a predetermined distance from the thickness vertical center line Ob toward the outer surface of the globe.

  Similarly, on the joint surface 6X2a of the underglove 6X2, a trapezoidal fitting groove 6X2e to be fitted to the triangular fitting protrusion 6X1e is fitted with its center displaced by a predetermined distance from the thickness center line Ob toward the outer surface of the globe. At a position corresponding to the center line Oc, an annular shape is formed over the entire circumference of the joint surface 6X2a.

  FIG. 7 shows a welded portion Yb formed after ultrasonic fitting or vibration welding of the fitting portion over the entire circumference in a state where the triangular fitting protrusion 6X1e and the trapezoidal fitting groove 6X2e are fitted. The surroundings are shown enlarged.

  The welded portion Yb is formed in a series from the vicinity of the fitting portion between the triangular fitting protrusion 6X1e and the trapezoidal fitting groove 6X2e to the outer surface side of the globe 6, and closer to the inner surface side of the globe 6 than the welded portion Yb. The minute gap gc is formed in an annular shape over substantially the entire circumference of the joint surfaces 6X1a and 6X2a. The minute gap gc is, for example, 0.3 mm, and preferably 0.5 mm or less.

  However, the welded portion Yb may have a flash B having a diameter smaller than that of the welded portion Yb on the outer surface thereof, that is, on the outer surface side of the globe 6.

  This flash B is formed in a position where the triangular fitting protrusion 6X1e and the trapezoidal fitting groove 6X2e fitted thereto are displaced to the outer surface side of the globe with respect to the thickness vertical center line Ob of the globe 6. When the fitting portions 6X1b and 6X2b are melted, a part thereof protrudes outward from the outer surface of the globe 6 and is cooled and solidified. The flash B is cut out by a necessary cutter or a polishing machine after welding the joint surface of the top glove 6X1 and the underglove 6X2.

  FIG. 8 is a front view showing a part of the outer surface of the globe 6 after cutting the flash B shown in FIG.

  That is, according to the configuration of the new fitting portions 6X1b and 6X2b shown in FIG. 6, only one minute gap gc is formed inside the welded portion Yb of the top glove 6X1 and the underglove 6X2 as shown in FIG. Since only one division seam line e along the horizontal division line Oa is projected onto the outer surface of the globe 6, the appearance can be improved.

  In addition, when the fitting portions 6X1b and 6X2b are melted, even if a part of the fitting portions 6X1b and 6X2b flows toward the inner surface side of the globe 6 from the welded portion Yb, the flow can be stopped in the minute gap gc. For this reason, it is possible to prevent or reduce the formation of the flash B on the inner surface of the globe 6.

  The minute gaps ga, gb, and gc are preferably as small as possible, and it is preferable that no gap exists to make the divided seam lines c, d, and e invisible. If it forms in the thickness direction whole surface of joining surface 6X1a, 6X2a, a part of welding part Ya and Yb will protrude on the outer surface side or inner surface side of the globe 6, and the flash | burr B will be formed. As described above, the flash B protruding from the outer surface of the globe 6 can be easily removed by cutting, but it is difficult to remove the flash B on the inner surface side of the globe 6. The generation of flash is suppressed by forming a minute gap gc having a length l so as not to be noticeable even when a shadow of the joining line is projected. The length l of the minute gap gc is preferably ½ or less of the thickness of the globe 6, for example, 3 mm or less.

  Further, in the fitting portions 6X1b and 6X2b of the globe 6, the fitting convex shapes 6X1c and 6X1e are rectangular, arcuate, and triangular in cross section, and the fitting grooves 6X2c and 6X2e are rectangular and circular in cross section. Although arc-shaped and trapezoidal cases have been described, the present invention is not limited to these shapes and may be changed as appropriate.

  By the way, at the end of the lamp life, a temperature rise occurs in the pair of electrodes 4i and 4j. Therefore, when the globe 6 is made of a light-transmitting resin such as polycarbonate or acrylic, the vicinity of these electrodes 4i and 4j. There is a problem that the surface temperature of the resin member such as a part of the globe 6 is raised to, for example, about 170 ° C., and the resin may be softened and melted.

  Therefore, in the present invention, a translucent resin such as polycarbonate, acrylic, ABS, or PE may be used as a base material for the resin member of the globe 6, and 5 to 30% by mass of a glass filler may be added to these resins. As this glass filler, a fibrous material is desirable in order to increase the elastic retention with respect to temperature.

  As for the addition amount of the glass filler, for example, when the resin base material is polycarbonate, unloading softening starts at around 160 ° C. without addition, but in the case of addition of 5% by mass or more, for example, around 180 ° C. Unweighted softening is started and an improvement of around 20 ° C. is obtained.

  For this reason, softening or melting of the globe 6 due to abnormal heat generation at the end of the lamp life or the life of the lighting circuit or the like can be suppressed.

  However, when the addition amount of the glass filler exceeds 30%, glass roughness occurs on the surface of the globe 6 and the light transmittance is reduced. Therefore, the addition amount of the glass filler is desirably 30% or less.

1 is a front view showing a part of a bulb-type fluorescent lamp according to a first embodiment of the present invention in a longitudinal section. (A), (B), (C) is an expanded vertical sectional view which expands and shows a part of joining surface along the horizontal dividing line of the globe shown in FIG. The front view of the illuminating device which concerns on the 3rd Embodiment of this invention. The expanded longitudinal cross-sectional view after the welding of the fitting part shown to FIG. 2 (A)-(C). The external appearance front view which notches and shows a part of outer surface of the glove shown in FIG. The principal part expansion longitudinal cross-sectional view which shows the other structure of the glove | globe fitting part of the lightbulb-type fluorescent lamp which concerns on other embodiment of this invention. The expansion longitudinal cross-sectional view after the welding of the glove fitting part shown in FIG. The external appearance front view which notches and shows a part of outer surface of the glove shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bulb-type fluorescent lamp, 2 ... Base, 3 ... Cover, 3a ... Cover main body, 3b ... Opening attachment end part of cover, 3c ... Convex step part of cover, 4 ... Light-emitting tube, 4a, 4b ... A pair of electrodes Sealed end portion, 4h ... folded portion, 4e ... arc tube spiral portion, 4f ... arc tube straight portion, 4g ... glass bulb, 4k ... arc tube maximum outer diameter portion, 5 ... holder, 5a ... holder 5c, the holder mounting hole, 5f, the holder cover engaging portion, 5g, the upper protrusion, 5h, the lower protrusion, 5i, the slit, 6 ... Globe, 6a ... Globe spherical portion, 6b ... Reduced diameter portion of globe, 6b1 ... Reduced diameter opening end of underglove, 6b2 ... Under glove engagement step, 6X1 ... Top glove, 6X1a ... Top glove joint surface, 6X1b ... top glove fitting part, 6X1c ... top Glove fitting ridges, 6X1e ... Wedge-like ridges of top glove, 6X2 ... Under glove, 6X2a ... Under glove joint surface, 6X2b ... Under glove fitting portion, 6X2c, 6X2e ... Under glove fitting groove, 7 ... lighting device, 7a ... vertical substrate of lighting device, 7b ... electronic components of lighting device, 11, 15 ... lighting device, 12 ... lighting fixture body, Ya, Yb ... welding part, ga, gb, gc ... minute gap.

Claims (5)

A cover having a base disposed at one end and having an attachment end and a locking portion on the other end;
On the opening end side attached to the mounting end portion of the cover, a reduced diameter portion is formed which has a diameter smaller than the maximum diameter portion on the top end side of the other end, and at least two portions on the reduced diameter side and the top end side are formed. The glove is divided along the direction perpendicular to the axis so as to be divided, and the joint part of this division has a fitting part that fits each other, and these fitting parts are fixed by ultrasonic welding or vibration welding. When;
A helically formed arc tube having a pair of electrodes housed in the globe;
A lighting device housed in the cover;
A bulb-type fluorescent lamp characterized by comprising: 2. The bulb-type fluorescent lamp according to claim 1, wherein the split joint portion is formed at a maximum diameter portion of the globe. The bulb-type fluorescent lamp according to claim 1 or 2, wherein the split joint portion is formed at a position where the fitting portion is displaced outward from the intermediate position in the thickness direction of the globe. The split joint portion is a welded portion that melts the fitting portion and welds the globe joint surfaces to each other and extends to the outer surface of the globe,
The gap between the globe joint surfaces formed on the inner surface side of the globe from this welded portion,
The bulb-type fluorescent lamp according to claim 3, wherein A lighting fixture body;
A socket attached to the luminaire body;
The bulb-type fluorescent lamp according to any one of claims 1 to 4, which is mounted in a socket;
An illumination device comprising:

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