JP2008027850A - Light bulb-type fluorescent lamp and lighting device - Google Patents

Abstract

A bulb-type fluorescent lamp and an illumination device are provided that can improve luminous efficiency and reduce a discharge start voltage and a lamp lighting voltage.
A cover 3 having a base 2 at one end of a cover main body 3a and having an attachment end 3b at the other end; an opening end attached to the attachment end of the cover, and a maximum diameter on the top end side of the other end A globe 6 in which a reduced diameter portion 6b having a diameter smaller than that of the portion 4k is formed; and a glass bulb 4g having a pair of electrodes 4i and 4j accommodated in the globe, and this bulb has a maximum diameter portion 6c of the globe. A spiral part 4e formed in a spiral shape having at least a part of a spiral diameter larger than the reduced diameter part 6b of the globe located on the top end part 6d side, and a glove integrally coupled to the spiral part And a straight portion 4f, 4f including a pair of electrode sealing end portions 4a, 4b extending in the direction of the spiral axis of the spiral portion, and having a valve outer diameter D of the spiral portion. Is formed with a diameter larger than the bulb outer diameter C of the straight portion 4 and; a lighting device 7 accommodated in the cover; characterized in that it comprises a.
[Selection] Figure 1

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 light bulb-type fluorescent lamp has been miniaturized to a size close to that of a general light bulb defined in JIS, and has an appearance similar to that of a general light 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 helical light bulb fluorescent lamp, the spiral end of the spiral arc tube extends into the cover, and the end of the arc tube is supported by the holder in the cover. There is a problem that the cover is enlarged.

  In addition, this cover is a portion that does not emit light because it does not transmit the light emitted from the arc tube, and if the width of the holder is large, the ratio of the light that is irradiated in the direction of the holder is not sufficiently reflected and is lost. Luminous efficiency tends to decrease.

  Furthermore, as a method of forming the valve in a spiral shape, for example, as shown in FIGS. 6 and 7 of Patent Document 3, a complicated mold such as a large number of segments around which the valve is wound is provided so as to be radially displaceable. However, there is a problem that the production of the spiral arc tube is not easy and the yield is deteriorated.

  When at least a part of the arc tube is formed in a spiral shape, the discharge path length can be extended, so that the luminous efficiency can be improved. On the other hand, the discharge start voltage and the lamp lighting voltage are both There is a problem of becoming higher.

  That is, the glove that accommodates this helical valve is integrally connected with the spherical top end side including the maximum diameter part and the cylindrical reduced diameter part narrowed to a smaller diameter than this. In the case where the valve is formed in a spiral shape also in the diameter portion, it is necessary to reduce the entire spiral diameter to a small diameter corresponding to the reduced diameter portion. When the spiral diameter is reduced, the bulb diameter needs to be reduced in order to increase the predetermined discharge path length. However, if the bulb diameter is too small, the light emission efficiency is reduced and the discharge start voltage and the lamp lighting voltage are reduced. There is a problem that both become high.

  The present invention has been made in view of such circumstances, and provides a light bulb-type fluorescent lamp and an illuminating device that can improve luminous efficiency and can reduce a discharge start voltage and a lamp lighting voltage. With the goal.

  The bulb-type fluorescent lamp according to claim 1 is a cover having a base at one end of the cover body and having an attachment end at the other end; an opening end attached to the attachment end of the cover, and a top end side at the other end A globe formed with a reduced diameter portion that is smaller than the maximum diameter portion; and a valve having a pair of electrodes accommodated in the globe, the valve being positioned on the top end side including the maximum diameter portion of the globe And a helical part formed in a spiral shape having at least a part of a spiral diameter larger than the reduced diameter part of the globe, and is integrally coupled to the helical part and disposed on the reduced diameter part side of the globe. A light emitting device comprising a straight portion including a pair of electrode sealing end portions extending in the direction of the spiral axis of the spiral portion, wherein the bulb diameter of the spiral portion is formed larger than the bulb diameter of the straight portion. And a lighting device housed in the cover. That.

  The bulb-type fluorescent lamp according to claim 2 is characterized in that a bulb outer diameter of the straight portion is 7 to 9 mm.

  The bulb-type fluorescent lamp according to claim 3 is characterized in that the globe is formed integrally with the cover.

  According to a fourth aspect of the present invention, there is provided a light bulb shaped fluorescent lamp comprising the light bulb shaped fluorescent lamp according to any one of the first to third aspects; and an instrument body to which the light bulb shaped fluorescent lamp is attached.

  According to the light bulb shaped fluorescent lamp of the first aspect, the helical portion of the arc tube can form a discharge path length by forming the bulb in a helical shape, and the helical portion can be used as a maximum of the globe. Since it is accommodated in the top end portion side having a relatively large internal volume including the diameter portion, it is possible to further extend the discharge path length. For this reason, since the surface area per unit length of the phosphor film formed on the inner surface of the bulb can be increased, both the luminous flux and the luminous efficiency can be improved.

  In addition, the straight part of the arc tube accommodated in the narrow diameter-reduced part side of the globe has a discharge path length shorter than that of the spiral part, so that most of the discharge path length necessary for the arc tube is reduced to the spiral part. Therefore, the spiral diameter of the spiral portion can be increased to ensure the discharge path length. For this reason, the bulb diameter of the spiral portion of the arc tube can be formed partially larger than the bulb diameter of the straight portion. This eliminates the need for excessively reducing the bulb diameter over substantially the entire length of the arc tube including the spiral portion and the straight portion.

  For this reason, it is possible to reduce the starting voltage and the lamp lighting voltage.

  The straight portion extends in the axial direction in the reduced diameter portion of the globe, and the valve diameter is smaller than the valve diameter of the spiral portion, so that there are more gaps in the space around the straight portion. For this reason, it is possible to reduce the amount of light that is emitted from the spiral portion or the straight portion itself and is blocked by the straight portion itself.

  According to the light bulb shaped fluorescent lamp of claim 2, since the bulb outer diameter of the straight portion is 7 to 9 mm and is thin, the gap around the straight portion in the globe can be increased. For this reason, it is possible to suppress a light shielding amount in which light emitted from the spiral part and the straight part is shielded by the straight part itself and light emitted outside the globe is reduced.

  According to the light bulb shaped fluorescent lamp of the third aspect, since the cover is formed integrally with the translucent glove with a resin or the like, light can also be output to the outside from this cover portion. For this reason, luminous efficiency can be improved.

  Further, since the cover is formed integrally with the glove, the number of manufacturing steps can be reduced and manufacturing efficiency can be improved as compared with the case where these are formed separately.

  According to the illuminating device of the fourth aspect, since the light bulb-type fluorescent lamp according to any one of the first to third aspects is provided, it is possible to provide an illuminating device having the effect of the light bulb-type fluorescent lamp.

  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 front view showing a part of a bulb-type fluorescent lamp according to a first embodiment of the present invention in a longitudinal section, FIG. 2 is a front view of the arc tube shown in FIG. 1, and FIG. 3 is a plan view of the arc tube. It is.

  As shown in FIG. 1, a bulb-type fluorescent lamp 1 has a cover 3 having 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 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. 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 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 has a cover body 3a in which an inverted frustoconical portion and a cylindrical portion that are gradually reduced in diameter toward the lower side in FIG. 1 by a heat resistant synthetic resin such as polybutylene terephthalate (PBT) are integrally coupled. The shell 2a of the base 2 is attached to one end (lower end in FIG. 1) of the cover body 3a, and an annular opening as an attachment end is attached to the other end side (upper end side in FIG. 1) of the cover body 3a. A 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.

  That is, the holder 5 is formed in a covered cylindrical shape with a heat-resistant synthetic resin such as PBT, for example, on the peripheral edge of the lower surface of the disk-shaped substrate portion 5a forming the lid portion, on one end (lower end in FIG. 1) side. The projecting cylindrical cylindrical portion 5b is integrally coupled, and the lower end of the cylindrical portion 5b in FIG. 1 is placed on the convex stepped portion 3c of the cover body 3a and fixed by 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. The thin tubes 4c projecting outward and the outer wires 4d and 4d shown in FIG. 2 are respectively inserted.

  The globe 6 is formed of a material such as transparent or light diffusing glass or synthetic resin into a smooth curved surface that is close to the shape of a glass bulb of a general lighting bulb such as an incandescent bulb. That is, the globe 6 is integrally connected with a substantially cylindrical reduced diameter portion 6b that is gradually reduced in diameter to a smaller diameter than the spherical portion 6a at the lower end in FIG. 1 of the spherical portion 6a formed in a substantially spherical shape. 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 an opening end 6d at one end (the lower end in FIG. 1) of the globe 6, and the edge of the opening end 6d is fitted inside the opening mounting end 3b of the cover 3. For example, it is bonded and fixed by an adhesive such as silicone resin or epoxy resin.

  The globe 6 is divided into a left half 6X1 and a right half 6X2 in the vertical division on the center axis of the globe 6 coaxial with the center axis O of the arc tube 4 in FIG.

  That is, when the globe 6 is formed of, for example, a non-divided integral, the outer diameter of the maximum outer diameter portion 4k of the arc tube 4 is larger than the opening end portion 6d of the globe 6, so that this opening The arc tube 4 cannot be inserted into the globe 6 from the end 6d.

  However, since the globe 6 is divided into left and right halves 6X1 and 6X2 on the central axis O, after the arc tube 4 is erected on the holder 5, the outside of the arc tube 4 is The left and right half portions 6X1 and 6X2 of the globe 6 are respectively covered from the side, and the left and right half portions 6X1 and 6X2 can be attached to the cover 3 in a state where they are abutted together.

  Thereafter, the outer surface of the globe 6 is covered with a bag-shaped heat-shrinkable film, not shown, and the heat-shrinkable film is heat-shrinked so that the left and right half portions 6X and 6X2 of the globe 6 are integrated with each other. Can be combined.

  The globe 6 may be divided into two in the lateral direction (horizontal direction). In this case, as indicated by a broken line in FIG. 1, the center line Oa of the maximum outer diameter portion 4k of the arc tube 4 may be divided into two parts 6Y1 and 6Y2 in the vertical direction in FIG. According to this, since the horizontal dividing line is the center line Oa of the maximum outer diameter portion 4k of the arc tube 4, the entire arc tube 4 can be covered by the pair of upper and lower globes 6Y1, 6Y2.

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

  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. 3, the spiral portion 4e is turned to one electrode sealing end portion of the glass bulb 4g, for example, the turning portion 4h that is the top end portion in FIG. A double spiral shape having a first swivel part A that reaches the other swivel part 4h and a second swivel part B that swivels around the swivel axis O and reaches the other electrode sealing end, for example, 4b For example, it turns around 3 times (the 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. In addition, the folding | returning part 4h which is the top end part of the helical part 4e forms the valve diameter in the bulging part larger diameter than the diameter of the 1st, 2nd turning parts A and B, and this bulging part has You may form so that the coldest part may be formed.

  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 on the outer surfaces of the pair of electrode sealing end portions 4a and 4b, a narrow tube 4c communicating with the inside protrudes. Mercury or amalgam is accommodated in the thin tube 4c.

  The spiral portion 4e 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 shape of the inner surface of the spherical portion 6a of the globe 6 and the folded portion 4h at the top end. Gradually increases toward the maximum diameter portion 6c, maximizes the spiral diameter at the maximum diameter portion 6c of the globe 6, and further reduces the spiral diameter corresponding to the reduced diameter of the lower half of the spherical portion 6a of the globe 6. The diameter is gradually reduced, and the straight portion 4f is integrally coupled to the upper end portion in FIG.

  The straight part 4f is a pair of spiral terminal parts of the spiral part 4e, and the lower part in FIG. 1 of the glass bulb 4g on the side of the pair of electrode sealing ends 4a and 4b is disposed below the cylindrical part 6b of the globe 6 in the axial direction. 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 on the inner surface of the holder 5. That is, the holder 5 is formed with a pair of longitudinal grooves opposed to each other in the diameter direction on the inner surface thereof in the axial direction of the holder 5, and both side edges in the width direction of the longitudinal substrate 7 a are fitted and fixed in the longitudinal grooves. ing. 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) φ2 of the arc tube 4 is 54 mm, the height h1 of the arc tube 4 is 64 ± 1 mm, and a pair of electrodes are sealed from the horizontal central axis of the maximum diameter portion 4k of the arc tube 4. The height h2 to the outer surface of the ends 4a and 4b is 39.93 mm. The length of the discharge path 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. The outer diameter φ3 of the base 2 is 26 mm, which is about 1.17 times the arc tube maximum outer diameter φ2 (30.5 mm).

  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.

  FIG. 4 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.

  FIG. 5A is a front view of a bulb-type fluorescent lamp 1A according to the third embodiment of the present invention. The bulb-type fluorescent lamp 1A is an integral globe formed by integrally forming a cover 3 of the bulb-type fluorescent lamp 1 on a globe 6 with a heat-resistant and light-shielding resin such as PET (polyethylene terephthalate) or PC (polycarbonate). It is characterized by having 6P. The other configuration is substantially the same as that of the bulb-type fluorescent lamp 1 described above.

  In FIG. 5A, symbol Ob is a vertical dividing line for dividing the integral globe 6P into two equal halves 6P1 and 6P2 in the axial direction along the central axis.

  According to the light bulb-type fluorescent lamp 1A, the resin-made glove 6P is formed by integrally molding the cover 3 with the globe 6. The glove 6P can be formed by, for example, injection molding. Manufacturing efficiency can be improved as compared with the case where the globe 6 is formed separately.

  Further, since this integral glove 6P is made of resin, when the two divided glove pieces 6P1 and 6P2 are joined to each other by the vertical dividing line Ob, it is stronger and easier by heat welding, ultrasonic welding, or adhesive. Can be joined. Compared with the case where the left and right glass globe halves 6X1 and 6X2 divided into two parts as in the bulb-type fluorescent lamp 1 shown in FIG. 1 and the like are joined by a heat shrinkable tube, the joining strength is improved and the joining workability is improved. Improvement can be achieved together.

  The dividing line of the integral globe 6P is not limited to the vertical dividing line Ob. For example, the central portion of the maximum diameter portion of the integral globe 6q as in the light bulb-type fluorescent lamp 1B shown in FIG. It may be a horizontal dividing line Oc that bisects 6q1 and 6q2 in the direction perpendicular to the axis, that is, in the horizontal direction.

  FIG. 6 is an exploded front view of a bulb-type fluorescent lamp 1C according to the fourth embodiment of the present invention, and FIG. 7 is a schematic plan view thereof. In this bulb-type fluorescent lamp 1C, the center axis Od in the width direction of the vertical substrate 7a of the lighting device 7 coincides with the vertical dividing line Ob of the integrated globe 6P similar to the integrated globe 6P shown in FIG. The main feature is that a pair of mounting grooves 5g and 5h into which the vertical substrate 7a is inserted are formed in the holder 5. The holder 5 is formed with a circumferential groove 5f, for example, about 5 mm below the opening end (the upper end in FIG. 6) of the base 2 when the base 2 is fitted and fixed to the outer surface thereof. . The open end of the integral globe 6P is fitted and supported in the circumferential groove 5f.

  As shown in FIG. 7, the pair of mounting grooves 5 g and 5 h are formed by forming a pair of insertion grooves into the axial direction on the inner peripheral surface of the holder 5, respectively, for fitting both end portions in the width direction of the vertical substrate 7 a. The center axis Od in the width direction of the vertical substrate 7a is made to coincide with the vertical dividing line Ob of the integral globe 6P.

  Therefore, in the assembly process of the bulb-type fluorescent lamp 1C, as shown in FIG. 6, after the arc tube 4 and the vertical substrate 7a are attached to the holder 5, they are attached by a pair of left and right glove pieces 6P1 and 6P2 from the left and right sides. After covering and joining the joint surfaces of the globe pieces 6P1 and 6P2 with an adhesive or the like, the lower ends in FIG. 6 of the globe pieces 6P1 and 6P2 are fitted into the circumferential groove 5f of the holder 5. Thereafter, the process proceeds to the step of fitting the upper end of the base 2 in FIG. In the attaching process of the base 2, a caulking force is applied to the outer peripheral surface of the upper end portion of the base 2 in the direction of reducing the diameter from almost the entire circumference toward the center of the holder 5. At this time, as shown in FIG. 7, with respect to the caulking force acting along the vertical dividing line Ob direction, the vertical substrate 7a supports in the width direction, so that the stress of the integral globe 6P along the width direction is reduced. be able to. For this reason, the distortion amount of the holder 5 in the direction along the vertical dividing line Ob of the integral globe 6P and the lower end portion in FIG. 6 of the integral globe 6P fitted to the outer periphery thereof can be reduced.

  For this reason, since the pair of left and right glove pieces 6P1 and 6P2 of the integral globe 6P can reduce the force generated in the direction in which the joint surface is displaced at the joint surface along the vertical dividing line Ob, The deviation can be prevented or reduced.

  Further, when the mounting position of the vertical substrate 7a is translated so that the center axis Od in the width direction of the vertical substrate 7a is offset (deviation) from the vertical dividing line Ob of the integrated globe 6P toward the one of the globe pieces 6P1 or 6P2. Therefore, it is possible to increase the strength of the glove piece 6P1 or 6P2 on the side where the vertical substrate 7a is displaced and to suppress deformation.

  FIG. 8 shows an example in which the vertical substrate 7a is arranged so that the center line Od in the width direction is orthogonal to the vertical dividing line Ob of the integral globe 6P. In this case, the component orthogonal to the vertical dividing line Ob of the integral globe 6P is supported by the vertical substrate 7a with respect to the caulking force applied to the lower end portion of the integral globe 6P via the base 2. The stress of the pair of left and right globe pieces 6P1 and 6P2 in this orthogonal direction, that is, in the width direction center line Od direction of the vertical substrate 7a can be reduced.

  Further, since the pair of left and right mounting grooves 5g and 5h supporting the vertical substrate 7a are sandwiched in the thickness direction at both ends in the width direction of the vertical substrate 7a, the distortion in the thickness direction of the vertical substrate 7a is reduced. it can. For this reason, the distortion along the thickness direction of the vertical substrate 7a on the vertical dividing line Ob of the integrated globe 6P on the vertical dividing line Ob of the globe 6P can be reduced.

  Further, since the center axis Od in the width direction of the vertical substrate 7a is orthogonal to the vertical dividing line Ob of the integrated globe 6P, the ease of positioning when attaching the integrated globe 6P to the holder 5 can be improved. it can.

  FIG. 9 is an exploded perspective view of a bulb-type fluorescent lamp 1D according to the fifth embodiment of the present invention. This bulb-type fluorescent lamp 1D has the main feature in that the helical arc tube 4 is replaced with, for example, a U-shaped tube 4X in the bulb-type fluorescent lamp 1C shown in FIG.

  When the width direction (lateral direction in FIG. 9) of the U-shaped tube 4X is smaller than the diameter d of the lower opening end 6P3 in FIG. 9 of the integral globe 6P, the U-shaped tube 4X is attached to the holder 5. After that, it can be inserted into the integrated globe 6P from its open end 6P3.

  Therefore, in this case, the vertical dividing line Ob of the integral globe 6P may be omitted. However, the U-shaped tube 4X may be a bent tube other than the helical tube 4e, such as a double U-shaped tube, a W-shaped tube, an H-shaped tube, or a saddle-shaped tube, and the width direction dimension of these bent tubes is the lower part of the integral globe 6P. When the diameter d is larger than the diameter d of the opening end 6P, the bent pipe Ob is necessary because these bent tubes cannot be inserted into the integrated globe 6P from the opening lower end 6P3.

  FIG. 10 is a front view of a spiral arc tube 4Y of a bulb-type fluorescent lamp 1E according to a sixth embodiment of the present invention. In this spiral arc tube 4Y, the spiral portion 4Y2 of the substantially conical spiral arc tube 4Y1 shown in FIG. The pair of straight portions 4f and 4f are integrally suspended from both ends of the maximum diameter portion 4k of the spiral portion 4Y3.

  That is, as shown in FIG. 11, the conical spiral tube 4Y1 is formed in a conical spiral shape so that valves adjacent in the axial direction (vertical direction in FIG. 11) do not overlap in the axial direction. .

  Next, the conical spiral portion 4Y1 is softened by heating, and the spiral top end portion (the upper end portion of the spiral portion 4Y1 in FIG. 11) is crushed toward the maximum diameter portion (lower end portion in FIG. 11) 4k to form a spiral shape. It is formed in the portion 4Y3.

  As shown in FIG. 10, according to the spiral arc tube 4Y, the spiral portion 4Y3 is formed in a spiral shape on one plane, and therefore, the direction perpendicular to the spiral plane, that is, indicated by an arrow in the figure. Illuminance directly below the direction can be improved.

  Further, according to the spiral arc tube 4Y, the conical spiral arc tube 4Y1 is crushed in the axial direction to form the planar spiral portion 4Y3, so that the axial length (height) is obtained. Can be reduced and the size can be reduced. In the spiral arc tube 4Y, a reflective film may be formed on the outer surface of the spiral portion 4Y3 on the straight portions 4f, 4f side. According to this, the light emitted from the spiral portion 4Y3 can be reflected in the direction of the arrow in FIG. 10 by the reflective film, so that the illuminance directly below can be further improved accordingly.

  FIG. 12 is a front view showing an example of the illumination device 15 according to the seventh embodiment of the present invention. In this illumination device 15, the spiral arc tube 4Y shown in FIG. The reflection mirror 16 has a flat inner surface formed on the reflection surface 16a.

  Therefore, according to this illumination device 15, since it has the spiral arc tube 4Y that improves the illuminance directly below as described above, the illumination device can also improve the illuminance directly below in the direction indicated by the arrow in FIG. Can do.

  Further, the spiral arc tube 4Y is formed with a pair of left and right straight portions 4f and 4f on the base 2 side, and the gaps around the straight portions 4f and 4f are increased, so that the light emission of the spiral portion 4Y3. However, the amount of light shielded by the straight portions 4f and 4f can be reduced.

  Moreover, since the light passing through the gap between the straight portions 4f and 4f is reflected by the reflecting surface 16a of the reflecting mirror 16 and is output to the front (in the direction of the arrow in FIG. 12), the luminous efficiency is further improved. be able to.

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. The front view of the arc tube shown in FIG. FIG. 2 is a plan view of the arc tube shown in FIG. 1. The schematic block diagram of the illuminating device which concerns on the 2nd Embodiment of this invention. (A) is a front view of the bulb-type fluorescent lamp according to the third embodiment of the present invention, (B) is a front view of a modification of the bulb-type fluorescent lamp. The disassembled front view of the lightbulb-type fluorescent lamp which concerns on the 4th Embodiment of this invention. FIG. 7 is a schematic plan view of the light bulb shaped fluorescent lamp shown in FIG. 6. The schematic plan view which shows the other positional relationship of the vertical dividing line of the integral glove shown in FIG. 7, and the vertical board | substrate of a lighting device. The disassembled front view of the lightbulb-type fluorescent lamp which concerns on the 5th Embodiment of this invention. The front view of the spiral arc tube of the bulb-type fluorescent lamp according to the sixth embodiment of the present invention. FIG. 11 is a front view of the conical spiral arc tube before being formed in the spiral arc tube shown in FIG. 10. The front view of the illuminating device which comprised the spiral arc tube shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C, 1D ... Bulb type fluorescent lamp, 2 ... Base, 3 ... Cover, 3a ... Cover main body, 3b ... Opening end of cover, 4 ... Arc tube, 4g ... Glass bulb, 4a, 4b ... a pair of electrode sealing ends, 4h ... folded part, 4e ... helical part of arc tube, 4f ... straight part of arc tube, 4k ... maximum outer diameter part of arc tube, 4Y ... spiral arc tube, 4Y1 ... Conical helical arc tube, 4Y3 ... Swirl part, 5 ... Holder, 5a ... Holder base plate part, 5c ... Holder cylindrical support part, 5d, 5e ... Holder mounting holes, 5f, 5g ... A pair of mountings Groove, 6 ... globe, 6a ... opening end of globe, 6b ... reduced diameter portion of globe, 6X1 ... left half of split globe, 6X2 ... right half of split globe, 6P ... integral globe, 6P1, 6P2: a pair of glove pieces, 7: a lighting device, 7a: a vertical substrate of the lighting device 7b ... lighting device electronic parts, 11, 15 ... lighting device, 12 ... lighting fixture body.

Claims (4)

A cover having a base at one end of the cover body and a mounting end at the other end;
A glove having a reduced diameter portion formed on the opening end side attached to the attachment end portion of the cover, the diameter of which is smaller than the maximum diameter portion on the top end side of the other end;
A valve having a pair of electrodes housed in the globe, the valve is located on the top end side including the largest diameter portion of the globe and has a spiral diameter at least partially larger than the reduced diameter portion of the globe. And a pair of electrode sealing ends that are integrally formed with the helical portion and disposed on the reduced diameter portion side of the globe and extend in the direction of the helical axis of the helical portion. An arc tube comprising: a straight portion including the bulb portion, wherein the bulb diameter of the spiral portion is larger than the bulb diameter of the straight portion;
A lighting device housed in a cover;
A bulb-type fluorescent lamp characterized by comprising: The bulb-type fluorescent lamp according to any one of claims 1 to 3, wherein a bulb outer diameter of the straight portion is 7 to 9 mm. The bulb-type fluorescent lamp according to claim 1 or 2, wherein the globe is formed integrally with the cover. A bulb-type fluorescent lamp according to any one of claims 1 to 3;
An instrument body to which a bulb-type fluorescent lamp is attached;
An illuminating device comprising:

Images