JP2008010404A - Light bulb-type fluorescent lamp and lighting device - Google Patents

Abstract

A bulb-type fluorescent lamp and a lighting device capable of improving luminous efficiency are provided.
A cover 3 having a base 2, a globe 6, and a glass bulb 4 g having a pair of electrodes 4 h and 4 i housed in the globe are provided, and this bulb includes a top end including a maximum diameter portion 6 c of the globe. A spiral portion 4e that is formed in a spiral shape on the portion 6d side, and is integrally connected to the spiral portion and located on the reduced diameter portion 6b side of the globe, and extends straight in the axial direction thereof. The arc tube 4 includes a straight portion 4f including a pair of electrode sealing end portions 4a and 4b; and a lighting device 7 housed in a cover.
[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.

  Moreover, since this cover is generally formed so as not to transmit the light emitted from the arc tube, it does not emit light. If the width of the holder is large, the light irradiated in the direction of the holder is not sufficiently reflected. Since the ratio of loss increases, the light emission 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.

  And the glove which 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 down to a smaller diameter. 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 in accordance with the reduced diameter portion. When the spiral diameter is reduced, the bulb diameter needs to be reduced in order to ensure a predetermined discharge path length. However, if the bulb diameter is too small, the luminous efficiency is reduced and the discharge start voltage and the lamp lighting voltage are reduced. There is a problem that both are high.

  In addition, when the bulb diameter is small, it is not easy to mold the straight glass bulb into a spiral shape with a mold, and cracks and distortion are likely to occur during the molding, resulting in a spiral shape. There is a problem that the yield in the case of mass production of glass bulbs decreases.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a light bulb-type fluorescent lamp and an illuminating device that can improve luminous efficiency.

  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 A spiral portion having a spiral diameter at least partially larger than the reduced diameter portion of the globe, and a pair of electrode sealing ends integrally coupled to the spiral portion. And a light emitting tube having a short discharge path portion which is positioned on the reduced diameter portion side of the globe and whose discharge path length is shorter than that of the spiral portion; and a lighting device housed in the cover. And

  A bulb-type fluorescent lamp according to claim 2, wherein the cover body has a cap at one end and an attachment end at the other end; the opening end attached to the attachment end of the cover, and the top end of the other end A globe formed with a reduced diameter portion that is smaller than the maximum diameter portion; and a spiral valve having a pair of electrodes accommodated in the globe, the valve including a top end portion including the maximum diameter portion of the globe And a pair of electrodes integrally coupled to the dense pitch portion and the dense pitch portion having a spiral winding pitch located at the side and having a spiral diameter at least partially larger than the reduced diameter portion of the globe An arc tube having a sealed end portion and a sparse pitch portion with a helical winding pitch located on the reduced diameter portion side of the globe; and a lighting device housed in the cover. Features.

  The bulb-type fluorescent lamp according to claim 3 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 of 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. An arc tube having a straight portion including a pair of electrode sealing ends extending in the direction of the spiral axis of the spiral portion; and a lighting device housed in the cover; .

  The bulb-type fluorescent lamp according to claim 4 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 of 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. And a valve end that is bent from the maximum diameter portion of the spiral portion to the base side at a turning angle within 3/4 of the spiral shape and bent so that the electrode sealing end portion extends to the base side An arc tube; and a lighting device housed in the cover. The features.

  The bulb-type fluorescent lamp according to claim 5 is characterized in that the bulb has an outer diameter of 7 to 10 mm and a discharge path length of 360 to 610 mm.

  The bulb-type fluorescent lamp according to claim 6 has an outer diameter of the maximum diameter of the globe of 2.0 to 2.5 times the outer diameter of the base, and an outer diameter of the reduced diameter of the globe is 1.0 of the outer diameter of the base. It is -1.5 times.

  The bulb-type fluorescent lamp according to claim 7 is characterized in that the shortest distance between the inner surface of the globe and the outer surface of the arc tube is 2 to 7 mm.

  An illuminating device according to an eighth aspect includes the light bulb-type fluorescent lamp according to any one of the first to seventh aspects; and an instrument body to which the light bulb-type fluorescent lamp is attached.

  According to the light bulb shaped fluorescent lamp according to claim 1, the spiral portion of the arc tube is accommodated in the top end portion side having a relatively large internal volume including the maximum diameter portion of the globe. The discharge path length can be ensured. For this reason, it is not necessary to excessively reduce the bulb diameter over almost the entire length of the arc tube including the short discharge path portion and the spiral portion of the arc tube, so that the luminous efficiency can be improved and the starting voltage can be reduced. The rise can be avoided.

  According to the bulb-type fluorescent lamp of claim 2, the dense pitch portion of the spiral arc tube is accommodated in the top end portion side having a relatively large internal volume including the maximum diameter portion of the globe. Both spiral diameters can be increased.

  Further, since the sparse pitch portion of the arc tube is accommodated in the narrow diameter-reduced portion side of the globe and the helical diameter pitch is also sparse, the discharge path cannot be made longer than the dense pitch portion. Therefore, by sharing most of the discharge path length necessary for the arc tube to the dense pitch portion, the bulb diameter of the sparse pitch portion can be increased to the same diameter as the dense pitch portion.

  For this reason, the surface area per unit length of the phosphor film formed on the inner surface of the bulb can be increased, so that the luminous flux and the luminous efficiency can be improved.

  Furthermore, since both the bulb diameter and the spiral diameter can be increased, the molding process when the glass bulb is formed into a spiral shape by molding using a mold can be facilitated.

  According to the bulb-type fluorescent lamp according to claim 3, since the spiral portion of the arc tube is accommodated in the top end portion side having a relatively large internal volume including the maximum diameter portion of the globe, the bulb diameter and the spiral diameter. The diameter can be increased together.

  In addition, the bulb end portion of the arc tube housed in the narrow diameter part of the globe has a discharge path length shorter than that of the spiral portion, so that most of the discharge path length required for the arc tube is changed to the spiral portion. By sharing, the spiral diameter can be increased and the discharge path length can be ensured. For this reason, it is not necessary to make the bulb diameter excessively small over almost the entire length of the arc tube including the bulb end portion and the spiral portion of the arc tube.

  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.

  Furthermore, since both the bulb diameter and the spiral diameter can be increased, the glass bulb can be easily formed into a spiral shape by molding using a mold, and cracks and distortion during the molding can be reduced. Can do. As a result, both the mass productivity and the yield of the valve having the spiral portion are improved.

  According to the bulb-type fluorescent lamp of claim 4, since the spiral portion of the arc tube is accommodated in the top end portion side having a relatively large internal volume including the maximum diameter portion of the globe, the bulb diameter and the spiral diameter are The diameter can be increased together.

  In addition, the bulb end portion of the arc tube housed in the narrow diameter part of the globe has a discharge path length shorter than that of the spiral portion, so that most of the discharge path length required for the arc tube is changed to the spiral portion. By sharing, the spiral diameter can be increased and the discharge path length can be ensured. For this reason, it is not necessary to make the bulb diameter excessively small over almost the entire length of the arc tube including the bulb end portion and the spiral portion of the arc tube.

  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.

  Furthermore, since both the bulb diameter and the spiral diameter can be increased, the glass bulb can be easily formed into a spiral shape by molding using a mold, and cracks and distortion during the molding can be reduced. Can do. As a result, both the mass productivity and the yield of the valve having the spiral portion are improved.

  The bulb end of the arc tube is bent from the maximum diameter portion to the base side at a turning angle within 3/4 of the spiral shape and bent to extend to the base side, so that the bulb end is bent. When forming, the valve can be easily bent without using a special mold. For this reason, it is possible to smoothly and easily perform bending when the spiral portion is integrally coupled to the bulb end portion, and to improve the yield of arc tube manufacturing.

  According to the bulb-type fluorescent lamp of claim 5, since the bulb outer diameter is 7 to 10 mm, the number of spiral turns of the spiral portion of the arc tube accommodated in the globe having the maximum outer diameter of 55 to 60 mm is increased. In addition, the discharge path length can be increased. For this reason, luminous efficiency can be improved and the crack and distortion of a helical part can be reduced.

  That is, when the bulb outer diameter is less than 7 mm, the discharge starting voltage and the lamp lighting voltage are increased, and the lighting device is enlarged. Further, when the bulb outer diameter is less than 7 mm, the number of spiral turns of the spiral portion of the arc tube disposed in the predetermined space in the globe can be increased and the discharge path length can be increased. When a straight circular glass bulb is formed into a spiral shape by molding using a glass, the outer diameter of the glass bulb is too thin, and cracks and distortion are likely to occur. For this reason, there exists a malfunction which reduces the yield in the case of mass-producing a helical glass bulb.

  On the other hand, when the bulb outer diameter is larger than 10 mm, the number of spiral turns is reduced and the discharge path length is shortened, so that the light emission efficiency cannot be improved. However, when priority is given to downsizing the arc tube, the upper limit value of the bulb outer diameter may be 9 mm.

  Further, the discharge path length of the bulb is preferably 400 mm or more in order to improve the light emission efficiency, but when priority is given to downsizing of the arc tube over the improvement of the light emission efficiency, the discharge path length may be 360 mm or more. However, when the discharge path length exceeds 610 mm, the discharge start (starting) voltage becomes high, leading to an increase in the size of the small lighting device disposed in the cover, and the lighting device is accommodated in the cover. May be difficult.

  According to the bulb-type fluorescent lamp of claim 6, the outer diameter of the maximum diameter portion of the globe is 2.0 to 2.5 times the outer diameter of the base, and the outer diameter of the reduced diameter portion of the globe is 1 of the outer diameter of the base. Since it is 0.0 to 1.5 times, the outer shape (outer appearance) of the general lighting bulb can be maintained.

  According to the light bulb shaped fluorescent lamp of the seventh aspect, it is possible to maintain the aesthetic appearance and to obtain the required brightness. That is, when the shortest gap between the inner surface of the globe and the outer surface of the arc tube is less than 2 mm, the outer surface of the arc tube is too close to the inner surface of the globe and the outer surface of the arc tube is seen through the globe and the product appearance is impaired. In addition, the globe is overheated by the heat radiation of the arc tube that generates heat.

  On the other hand, when the shortest gap between the outer surface of the arc tube and the inner surface of the globe exceeds 7 mm, the size of the arc tube becomes small and the required brightness cannot be obtained.

  According to the illuminating device of the eighth aspect, since the light bulb-type fluorescent lamp according to any one of the first to seventh aspects is provided, it is possible to provide an illuminating device having the effect of the light bulb-shaped 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 light bulb shaped fluorescent lamp and a lighting device 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. FIG.

  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. The bulb-type fluorescent lamp 1 has a size and appearance close to those of a general lighting bulb defined in JIS C 7501 such as incandescent bulbs with rated power of 40 W type, 60 W type, and 100 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 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. A projecting cylindrical cylindrical portion 5b is integrally coupled, and the lower end of the opening in FIG. 1 of the cylindrical portion 5b is fixedly engaged with the convex stepped portion 3c of the cover body 3a.

  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.

  In addition, the globe 6 is formed to have a thickness of 1.5 mm, for example, and the outer diameter of the maximum diameter portion 6c of the globe 6 is set to 2.0 to 2.5 of the outer diameter φ3 (26 mm) of the base 2. The maximum diameter portion 6 c of the globe 6 is substantially matched with the maximum diameter portion 4 k of the arc tube 4. Further, the globe 6 has an outer diameter of the reduced diameter portion 6b of 26 to 39 mm which is 1.0 to 1.5 times the outer diameter φ3 of the base 2. However, the base 2 may have an outer diameter of 17 mm.

  Further, as shown in FIG. 1, the bulb-type fluorescent lamp 1 is formed such that a gap connecting the inner surface of the globe 6 and the outer surface of the arc tube 4 with the shortest distance, that is, the shortest gap is 2 to 7 mm. For example, the shortest gap ga in the vertical direction (vertical direction) in FIG. 1 between the inner surface of the top end portion 6d of the globe 6 and the outer surface of the top end 4h of the arc tube 4 is 2 mm, the inner surface of the reduced diameter portion 6b of the globe 6 and light emission. The shortest gaps gb in the lateral direction (horizontal direction) in FIG. 1 with the outer surfaces of the electrode sealing end portions 4a and 4b which are the pair of straight portions 4f and 4f of the tube 4 are respectively formed to 3 mm.

  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 (not shown). ).

  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. Further, the dividing line portions in the vertical direction and the horizontal direction of these globes 6 may be fixed by ultrasonic welding or vibration fixing.

  The arc tube 4 has an upper spiral part 4e in FIG. 1 and a pair of straight parts 4f, 4f at the lower part (bulb end part), which are connected together.

  The spiral portion 4e is formed by bending a straight circular glass bulb 4g having an outer diameter of 8.5 mm, for example, into two substantially equal folds, and using a folded portion 4h at the equally divided position as a top end to a mold (not shown). It is formed by winding and molding into a double helix.

  The glass bulb 4g 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 4i and 4j are respectively sealed at both axial ends, The parts 4a and 4b are formed 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 turn-up portion 4h which is the top end portion in FIG. A double spiral shape having a first swivel portion A that reaches the other swivel portion 4h and a second swivel portion B that swivels around the swivel axis O and reaches the other electrode sealing end, for example, 4b. For example, each of the swiveling parts is swiveled almost twice (the number of turns). Therefore, 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. 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 straight portion 4f has a shorter discharge path length than the spiral portion 4e, and thus is also formed as a short discharge path portion. 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 that case, the straight portion 4f is used for forming the spiral portion 4e. Since the mold is removed, it is bent by hand or is turned using a simple mold, so that the spiral pitch is sparser than that of the spiral portion 4e, and is formed as a sparse pitch portion as a whole. .

  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 base 2. That is, the base 2 is formed with a pair of longitudinal grooves facing in the diameter direction on the inner surface thereof in the axial direction of the base 2, and both side edges in the width direction of the vertical 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 electrode seals is formed from the horizontal central axis Oa of the maximum diameter portion 4k of the arc tube 4. The height h2 to the outer surface of the toe portions 4a and 4b is about 40 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, and the maximum width w1 (30.5 mm) between the straight portions 4f and 4f of the arc tube 4 is about 1.17 times the outer diameter φ3 of the base 2.

  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, it is possible to increase both the luminous flux and the light emission efficiency in the spiral portion 4e.

  Further, the straight portion 4f, which is a short discharge path portion of the arc tube 4 accommodated in the narrow reduced diameter portion 6b side of the globe 6, has a discharge path length shorter than that of the spiral portion 4e. As a result, the bulb diameter can be increased to the same diameter as that of the spiral portion 4e. For this reason, the bulb diameter can be increased over substantially the entire length of the arc tube 4 including the straight portion 4 and the spiral portion 4 e of the arc tube 4.

  For this reason, the phosphor film surface area or bulb cross-sectional area per bulb unit length formed on the inner surface of the glass bulb 4g can be adjusted to an optimum value, so that the luminous efficiency can be improved.

  Furthermore, since both the bulb diameter and the spiral diameter can be increased, the ease of forming the glass bulb 4g into a spiral shape by molding using a mold can be improved. Cracks and distortion 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.

  Further, since the bulb diameter is relatively 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 almost parallel to the axial direction in the reduced diameter portion 6b of the globe 6, so that there is no gap. Many portions are formed and there are few portions shielded from light by the arc tube 4. 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.

  In the present invention, the straight part 4f may be formed in a sparse spiral sparse pitch part that is sparser than the spiral pitch of the spiral part 4e.

  That is, the sparse pitch portion is the same as that of the pair of electrode sealing end portions 4a and 4b of the glass bulb 4g located on the reduced diameter portion 6b side of the globe 6 in FIG. It may be formed in a spiral shape having a smaller diameter than the spiral diameter of the shape part 4e and a sparse pitch. Here, when the spiral pitch is sparse, the number of turns of the spiral includes one or less, and may be half.

  For this reason, the sparse pitch part is formed as a short discharge path part whose discharge path length is shorter than the discharge path length of the spiral part 4e, and the spiral part 4e has a helical pitch denser than the sparse pitch part. In addition to being formed as a dense pitch portion, it is formed as a long discharge path portion having a long discharge path length.

  For this reason, the sparse pitch portion has a low luminous efficiency with the luminous flux, but since the helical pitch is sparse, the light emitted on the spiral inner surface side of this sparse pitch portion increases the luminous flux emitted outside from the gap of the helical pitch. Can be made.

  FIG. 4 is a plan view of the spiral portion 4e showing a process after the spiral portion 4e of the arc tube 4 is formed by a mold and before the pair of straight portions 4f and 4f are bent. FIG. It is a front view of the arc tube 4e after bending the straight portions 4f, 4f.

  That is, as described above, the arc tube 4 is first heat-softened and wound around a mold (not shown) of the straight cylindrical glass bulb 4g that is equally divided into two folds. A spiral portion 4e is formed.

  At this time, as shown in FIG. 4, the spiral portion 4e has a pair of upper and lower portions in FIG. 4 that extend straight outward from the left and right ends Oa1 and Oa2 in the diametrical direction in FIG. Straight tubular end portions 4f1 and 4f2 are respectively formed.

  Next, these straight tubular end portions 4f1 and 4f2 are spirally formed around the central axis O with a spiral diameter smaller than the maximum diameter portion 6c without using a mold or using a small second mold (not shown). While being bent into a shape, turning downward in FIG. 5 (in FIG. 1, the base 2 side), it is bent so as to approach the central axis O side, and the central axis 4f1O of these straight tubular ends 4f1 and 4f2 , 4f2O are bent so as to hang downward in the vertical direction in FIG. 5 (in the base 2 side in FIG. 1) at positions where they are curved approximately half a circumference (about 180 °) from both ends Oa1 and Oa2 of the maximum diameter portion 6c. A pair of straight portions 4f1 and 4f2, that is, a pair of electrode sealing end portions 4a and 4b are formed.

  Therefore, as shown in FIG. 5, the pair of electrode sealing end portions 4a and 4b is formed in the spiral shape at the valve end portion below the maximum diameter portion 4k of the spiral portion 4e (on the base 2 side in FIG. 1). On the helical extension line of the portion 4e, the helical curved portion a that curves in an arc shape with a required central angle, and the reduced diameter that shrinks while approaching from both ends of the helical curved portion a toward the central axis O side. It has a curved part b and a straight part c extending straight from both ends of the reduced diameter curved part b downward in the vertical direction in FIG.

  Therefore, the pair of straight portions 4f and 4f are not directly formed directly from the diametrical ends Oa1 and Oa2 of the maximum diameter portion 4e, but spiral within a range of approximately a half circumference (about 180 °) of the spiral shape. Since it is formed in a straight shape after passing through the curved portion a and the reduced diameter curved portion b, the glass distortion at the time of forming the straight portions 4f and 4f is larger than that in the case where the straight portions 4f and 4f are formed directly. Generation can be reduced and the film can be formed smoothly and easily. Therefore, the manufacturing yield of the arc tube 4 can be improved.

  In this embodiment, the pair of straight portions 4f and 4f are formed at positions approximately half a circumference of the spiral shape (for example, a central angle of 180 °) from both ends Oa1 and Oa2 in the diameter direction of the maximum diameter portion 4e. As described above, the present invention is not limited to this. For example, a pair of straight portions 4f and 4f are formed by bending the valve end within a range of a central angle of 270 ° (3/4 spiral). Alternatively, the central angle may be 90 ° (a quarter of a spiral).

  FIG. 6 is a front view showing a part of a bulb-type fluorescent lamp 1A according to the second embodiment of the present invention in a longitudinal section. The bulb-type fluorescent lamp 1A is formed on a metal cover 3A and a holder 5A by forming the cover 3 and the holder 5 of the bulb-type fluorescent lamp 1 shown in FIG. The main feature is that the base 2A fitted and fixed to the metal cover 3A is formed of an electrically insulating resin.

  That is, since the base 2 of the bulb-type fluorescent lamp 1 shown in FIG. 1 is made of metal, there is a possibility that it is electrically connected to the metal cover 3A. Therefore, the main body of the base 2 is made of an electrically insulating resin to prevent conduction with the metal cover 3A.

  On the other hand, the base 2A made of resin comprises the base body 2A0 made of resin, and the outer surface of the screw portion 2A1 screwed into the socket of the lighting fixture is given conductivity by plating or fitting with a conductive material. ing.

  However, since the base 2A is electrically insulated at the opening end (upper end in FIG. 6) 2A2 fitted with the metal cover 3A, the outer surface of the opening 2A is plated with a conductive material. It is formed in the electrically insulating part without forming any fitting.

  The base 2A has a plurality of fitting protrusions 2A3, 2A3,... Projecting inwardly on the opening end 2A2 fitted on the opening lower end 3A1 of the metal cover 3A. Formed at intervals.

  On the other hand, the metal cover 3A is fitted into the opening end 2A2 of the base 2A in FIG. 6, and is fitted into the fitting protrusions 2A3, 2A3,... A plurality of fitting recesses 3A2, 3A2,... Are formed at predetermined intervals in the circumferential direction.

  For this purpose, when the opening end 2A2 in FIG. 6 of the base 2A is fitted on the outer surface of the opening lower end 3A1 of the cover 3A and pushed upward in the axial direction, each fitting protrusion of the opening upper end 2A2 of the base 2A The inner surface of 2A3, 2A3,... Is elastically deformed so as to expand by sliding in the axial direction on the outer surface of the opening lower end 3A1 of the cover 3A, and by sliding slightly in the circumferential direction, When positioned at 3A2, 3A2,..., The fitting protrusions 2A3, 2A3,... Of the base 2A are fitted into the fitting recesses 3A2, 3A2,. Thereby, the base 2A is fixed in a state of being electrically insulated from the cover 3A.

  The fitting projections 2A3, 2A3,... Of the cap 2A and the fitting recesses 3A2, 3A2,... Of the cover 3A are arranged at a predetermined interval in the circumferential direction of the cap 2A and the cover 3A. Therefore, it is possible to prevent the base 2A from being displaced relative to the cover 3A in the circumferential direction.

  Note that the fitting protrusions 2A3, 2A3,... Of the base 2A may be formed as annular protrusions that are continuously integrated in the circumferential direction of the base 2A, and the fitting recess 3A2 of the cover 3A. , 3A2,... May also be formed in a circumferential groove formed integrally and continuously in the circumferential direction of the cover 3A.

  According to the bulb-type fluorescent lamp 1A, since the cover 3A and the holder 5A are made of metal having good heat dissipation, heat generated by the arc tube 4 and the lighting device 7 is radiated with high efficiency by the holder 5A and the cover 3A. be able to. Note that the cover 3A and the holder 5A may be formed integrally or separately.

  FIG. 7 is a schematic configuration diagram of the illumination device 11 according to the third 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.

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 top view after forming the helical part of the arc tube shown in FIG. The front view after forming the linear part of the arc_tube | light_emitting_tube shown in FIG. The front view which shows a part of bulb-type fluorescent lamp concerning the 2nd Embodiment of this invention in a cross section. The schematic block diagram of the illuminating device which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bulb type fluorescent lamp, 2 ... Base, 3 ... Cover, 3a ... Cover main body, 3b ... Opening attachment end of cover, 4 ... Light-emitting tube, 4g ... Glass bulb, 4a, 4b ... Pair of electrode sealing end 4h: Folded portion, 4e: Helical portion of arc tube, 4f: Straight portion of arc tube, 4i: Maximum outer diameter portion of arc tube, 5: Holder, 5a: Substrate portion of holder, 5c: Tube of holder 5d, 5e ... Hole of holder, 6 ... globe, 6a ... opening end of globe, 6b ... diameter reduced portion of globe, 6X1 ... left half of splitting globe, 6X2 ... right of splitting globe Half, 7 ... lighting device, 7a ... vertical substrate of lighting device, 7b ... electronic component of lighting device, 11 ... lighting device, 12 ... lighting fixture body.

Claims (8)

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 being located on the top end side including the largest diameter portion of the globe and having a spiral diameter at least partially larger than the reduced diameter portion of the globe. A spiral-shaped portion having a spiral shape and a pair of electrode sealing ends integrally connected to the spiral-shaped portion and positioned on the reduced-diameter portion side of the globe, and having a discharge path length longer than the spiral-shaped portion. An arc tube having a short short discharge path;
A lighting device housed in a cover;
A bulb-type fluorescent lamp characterized by comprising: 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 spiral valve having a pair of electrodes housed in the globe is provided, the valve is located on the top end side including the maximum diameter portion of the globe, the spiral winding pitch is dense, and the reduced diameter portion of the globe A dense pitch portion having a larger spiral diameter at least in part and a pair of electrode sealing end portions integrally connected to the dense pitch portion and located on the reduced diameter portion side of the globe. An arc tube having a sparse pitch portion with a sparse pitch;
A lighting device housed in a cover;
A bulb-type fluorescent lamp characterized by comprising: 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 with a straight section comprising:
A lighting device housed in a cover;
A bulb-type fluorescent lamp characterized by comprising: 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 being located on the top end side including the largest diameter portion of the globe and having a spiral diameter at least partially larger than the reduced diameter portion of the globe. The spiral-shaped portion formed in a spiral shape and the spiral-shaped portion integrally formed with the spiral-shaped portion and disposed on the reduced-diameter portion side of the globe, and the spiral-shaped 3/4 from the maximum diameter portion of the spiral-shaped portion to the base side An arc tube having a bulb end bent at a turning angle within the circumference and bent so that the electrode sealing end extends toward the base;
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 4, wherein the bulb has an outer diameter of 7 to 10 mm and a discharge path length of 360 to 610 mm. The maximum outer diameter of the glove is 2.0 to 2.5 times the outer diameter of the base, and the outer diameter of the reduced diameter of the glove is 1.0 to 1.5 times the outer diameter of the base. The bulb-type fluorescent lamp according to any one of claims 1 to 6. The light bulb shaped fluorescent lamp according to any one of claims 1 to 7, wherein the shortest distance between the inner surface of the globe and the outer surface of the arc tube is 2 to 7 mm. A bulb-type fluorescent lamp according to any one of claims 1 to 7;
An instrument body to which a bulb-type fluorescent lamp is attached;
An illuminating device comprising:

Images