JP2006093381A - Coil component, circuit unit and electric bulb type fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil component capable of coping with both of the miniaturization of a profile and the improvement of mounting property onto a wiring substrate. <P>SOLUTION: In the bottom surface of a bottom plate 51 for a bobbin 50, a dummy pin 63 shorter than a terminal pin 62 is planted into a pin hole 60 with no terminal pin 62 planted thereinto whereby the miniaturization of profile of an inductor L1 is compatible with the improvement of mounting property of the inductor L1 onto the wiring substrate 21. In this case, when the dummy pin 63 is planted onto the bottom surface of a bottom plate 51 and the inductor L1 is constituted so as to be supported on the wiring substrate 21 employing the dummy pin 63 to realize the miniaturization of inductance L1 by omitting a supporting protuberance out of the bottom surface of the bottom plate 51, the inductance L1 can be stably mounted on the wiring substrate 21 upon the mounting work of the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In particular, the present invention relates to a winding component that is suitably mounted on a narrow wiring board, a circuit unit using the winding component, and a bulb-type fluorescent lamp.

  The bulb-type fluorescent lamp has a structure in which a compact fluorescent lamp (discharge lamp) and its lighting circuit unit are integrated, and is compact like an incandescent bulb for general lighting, and features a fluorescent lamp while having a one-piece base structure. Since it is a light source having both high lamp efficiency and long life, it is frequently used in place of incandescent bulbs.

  The bulb-type fluorescent lamp includes a fluorescent lamp formed in a compact shape, a lighting circuit unit that lights the fluorescent lamp, a cover that houses the lighting circuit unit, and a base disposed at the base end of the cover. Further, there are a configuration in which a glove surrounding the fluorescent lamp is fixed to the cover and a configuration in which the glove is not provided. In addition, as the shape of the globe, there are an A-shaped globe having an A-shaped bulb and a G-shaped globe having a G-shaped bulb.

  The A-type globe has recently been adopted in a more compact bulb-type fluorescent lamp (for example, “Neoball ZA type” related to the manufacture and sale of the present applicant). This bulb-type fluorescent lamp has, for example, a rated power consumption of 13 W, an outer diameter of 60 mm, and a total length of 109 mm. This is a size and appearance corresponding to a maximum diameter of 60 mm and a total length of 109 mm of a 60 W incandescent lamp for general lighting, and therefore, the adaptability to the lighting fixture for incandescent lamps is significantly improved.

  By the way, in order to increase the adaptability to incandescent lamp lighting fixtures, it is important not only to make the outer diameter and overall length of the bulb-type fluorescent lamp as close as possible to the incandescent bulb, but also to reduce the size of the cover, that is, to reduce the diameter It is. In order to reduce the size of the cover, it is necessary to reduce the size of the lighting circuit unit housed therein. To reduce the size of the lighting circuit unit, an inductor that occupies a large space on the wiring board of the lighting circuit unit. It is effective to downsize various winding parts such as transformers and transformers.

  However, generally, from the viewpoint of versatility with respect to various electric circuits and the like, it is desirable that the winding pin has a configuration in which the terminal pin to which the winding is electrically connected can be implanted at an arbitrary position on the bottom surface of the bobbin. For this purpose, it is preferable to provide as many pin holes as possible on the bottom surface of the bottom plate of the bobbin so that terminal pins can be appropriately implanted. Furthermore, from the viewpoint of design requirements or assembly requirements of the wiring board, each pin hole disposed on the bottom surface of the bobbin, a pitch that is standardized to some extent (for example, between terminals of other electronic components, etc. The pitch is preferably set to a standardized pitch equivalent to the pitch. That is, in the winding component, it is necessary to reduce the outer shape without sacrificing the number of pin holes arranged on the bottom surface of the bobbin and the pitch thereof.

In response to these problems, for example, in Patent Document 1, by omitting the supporting protrusions that are suspended from the four corners of the bottom surface of the bottom surface of the bobbin so as to come into contact with the wiring board, the size of the winding component can be reduced. Techniques to do this are disclosed.
JP 2002-289389 A

  However, in a winding component, since a part of the core fixed to the bobbin generally protrudes from the bottom surface, when the supporting protrusion is omitted as in the technique disclosed in Patent Document 1 above, When the winding component is mounted on the wire, the winding component may wobble on the wiring board with the core protruding from the bottom surface of the bobbin as a fulcrum. And when the winding parts are mounted in such an unstable state, the terminal pins are not sufficiently soldered to the wiring board, resulting in poor solder connection and lowering the yield of circuit units and the like. There is a risk of causing it.

  The present invention has been made in view of the above circumstances, and is capable of achieving both a reduction in outer shape and an improvement in mountability on a wiring board, a circuit unit using the winding component, and a light bulb. An object of the present invention is to provide a fluorescent lamp.

  The winding component according to the first aspect of the present invention includes a bobbin having a plurality of pin holes drilled in a bottom surface of a bottom plate on which the bobbin support is erected; and is selectively implanted in the pin hole and wound around the bobbin support A terminal pin to which a winding to be electrically connected is electrically connected; and a dummy pin which is implanted in the pin hole where the terminal pin is not implanted and whose protruding length from the bottom surface of the bottom plate is shorter than the terminal pin; It is characterized by having.

  According to a second aspect of the present invention, in the winding component according to the first aspect, the protruding length of the dummy pin is substantially equal to the length protruding from the bottom surface of the bottom plate of the core attached to the bobbin. It is characterized by.

  According to a third aspect of the present invention, in the winding component according to the second aspect, at least one dummy pin is disposed on each side of the core.

  According to a fourth aspect of the present invention, there is provided a circuit unit comprising the winding component according to any one of the first to third aspects mounted on a wiring board in a state in which a dummy pin of the winding component is in contact with the substrate surface. It is characterized by.

  A bulb-type fluorescent lamp according to a fifth aspect of the invention is characterized in that the circuit unit according to the fourth aspect is integrally provided as a lighting circuit unit of the fluorescent lamp.

  According to the first aspect of the invention, since the soldering operation can be performed in a state where the bobbin is stably supported by the short dummy pins, it is possible to achieve both the reduction of the outer shape and the improvement of the mounting property to the wiring board. It is possible to realize a winding component that can be used.

  According to the invention of claim 2, since the dummy pin stably supports the bobbin together with the bottom surface of the core, the stability of supporting the winding component is improved.

  According to the third aspect of the present invention, the wobble of the winding component with the bottom surface of the core as a fulcrum can be suppressed by the dummy pins arranged on both sides of the core.

  According to invention of Claim 4, the circuit unit using the coil | winding components provided with the effect of any one of Claim 1 thru | or 3 can be provided.

  According to the invention of claim 5, a light bulb shaped fluorescent lamp using the circuit unit of claim 4 can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is a partially sectional front view of a bulb-type fluorescent lamp, FIG. 2 is a plan view through which a globe of the bulb-type fluorescent lamp is seen, and FIG. FIG. 4 is a plan view showing a schematic configuration of the lighting circuit unit, FIG. 5 is a circuit diagram of the lighting circuit unit, FIG. 6 is an exploded perspective view of the bobbin and the core viewed obliquely from below, and FIG. 8 is a bottom view of the inductor, FIG. 9 is a cross-sectional view taken along the line II of FIG. 7, and FIG. 10 is a cross-sectional view of the main part of the inductor mounted on the wiring board.

  In FIG. 1, reference numeral 1 denotes a bulb-type fluorescent lamp. The bulb-type fluorescent lamp 1 includes a fluorescent lamp 10, a lighting circuit unit 20 as a circuit unit for energizing the fluorescent lamp 10, a fluorescent lamp 10 and a lighting lamp. It has an envelope 30 that houses the circuit unit 20 and a base 40 that can be attached to a socket such as an incandescent lamp.

  The fluorescent lamp 10 has a translucent discharge vessel 11 having a series of discharge paths bent inside, and a pair of electrodes 12 sealed at both ends of the translucent discharge vessel 11. Here, as shown in FIGS. 1 to 3, in this embodiment, the translucent discharge vessel 11 is composed of, for example, four U-shaped glass tubes that are equally arranged so that both legs are concentrically located. The main part is comprised by having 11a and connecting the adjacent leg part of these glass tubes 11a with the connection pipe | tube 11b. A fluorescent material is applied to the inner surface of the translucent discharge vessel 11, and an ionization medium containing appropriate amounts of mercury and a rare gas is sealed inside the translucent discharge vessel 11.

  As shown in FIG. 4, the lighting circuit unit 20 includes, for example, a substantially disc-shaped wiring board 21, a capacitor C mounted on the wiring board 21, and a circuit component 22 such as an inductor L as a winding component. Thus, for example, a main part of a lighting circuit unit (described later) shown in FIG. 5 is configured.

  The envelope 30 includes a translucent glove 31, a light-shielding base (cover) 32 that is connected to the base of the translucent glove 31, and the light-transmitting glove 31 and the light-shielding base 32. The main part is comprised including the partition 33 to be formed.

  The translucent globe 31 has a glass headed cylinder shape with a light diffusible film formed on the inner surface. The light-shielding substrate 32 has, for example, a cup shape formed by molding a white synthetic resin, and a base opening portion of the translucent glove 31 is fixed to a distal end opening portion with a silicone adhesive. ing. Moreover, the partition 33 is formed by molding a white synthetic resin, for example, and is integrally fixed to the light-transmitting globe 31 via a silicone adhesive at the tip opening of the light-shielding base 32. Thereby, the partition 33 partitions the inside of the envelope 30 into the light emitting chamber 34 and the circuit storage chamber 35.

  In addition, a plurality of fluorescent lamp support holes 33a are opened in the partition 33 (see FIG. 3), and both ends of the fluorescent lamp 10 inserted into the fluorescent lamp support holes 33a are fixed via a silicone adhesive. Yes. As a result, the partition 33 holds the fluorescent lamp 10 in the light emitting chamber 34. In the circuit storage chamber 35, the lighting circuit unit 20 is held by being attached to the partition 33. Here, as shown in FIG. 4, four wrapping pins 25 are implanted as high-frequency output ends on the wiring board 21, and these wrapping pins 25 are respectively connected from the pair of electrodes 12 of the fluorescent lamp 10. A derived external lead-in line (not shown) is connected.

  The base 40 is attached to the base end of the light-shielding base 32 of the envelope 30. The base 40 is connected to a directly insulated conductor 26 that is led out from the AC input terminal of the wiring board 21, whereby the base 40 is electrically connected to the wiring board 21.

Next, an example of the circuit configuration of the lighting circuit unit will be described with reference to FIG.
In the figure, AS is a low-frequency AC power supply, f is an overcurrent fuse, NF is a noise filter, RD is a rectified DC power supply, HFI is a high-frequency inverter, LC is a load circuit, and 10 is a fluorescent lamp.

  The low frequency AC power supply AS is a commercial 100V AC power supply.

  The overcurrent fuse f is formed of a pattern fuse formed integrally with the wiring board 21 and protects the lighting circuit unit from being burned out when the overcurrent flows and burning out.

  The noise filter NF is interposed between the low frequency AC power supply AS and the rectified DC power supply RD, and removes high frequency noise generated by switching in the high frequency inverter HFI so as not to flow out to the low frequency AC power supply AS side.

  The rectified DC power supply RD includes a bridge rectifier circuit BRC and a smoothing capacitor C1, and converts a low-frequency AC voltage into a smoothed DC power supply voltage.

  The high-frequency inverter HFI includes a first switching means Q1, a second switching means Q2, a gate drive circuit GDC, and a starting circuit ST, and constitutes a half-bridge inverter.

  The first switching means Q1 is composed of an N-channel MOSFET, and its drain is connected to the positive electrode of the rectified DC power supply RD and its source is connected to the source of the second switching means Q2.

  The second switching means Q2 is composed of a P-channel MOSFET, and its drain is connected to the negative electrode of the rectified DC power supply RD.

  The gate drive circuit GDC is composed of feedback means FB, LC resonance circuit RC, gate voltage output means GVO, and gate protection circuit GP.

  The feedback means FB is constituted by an auxiliary winding that is magnetically coupled to the current limiting inductor L2.

  The LC resonance circuit RC is configured by connecting an inductor L1 and a capacitor C2 in series with the feedback means FB.

  The gate voltage output means GVO is configured to extract the resonance voltage appearing at both ends of the capacitor C2 of the LC resonance circuit RC via the capacitor C3. One end of the capacitor C3 is connected to a connection point between the capacitor C2 and the inductor L1, and the other end of the capacitor C3 is connected to the gates of the first and second switching means Q1 and Q2.

  Furthermore, the other end of the capacitor C2 is connected to the sources of the first and second switching means Q1, Q2.

  The gate protection circuit GP is configured by connecting a circuit formed by connecting a pair of Zener diodes in reverse series to the gate voltage output means GVO in parallel, and clamps an excessive gate voltage to a required value.

  The gate drive circuit GDC has the circuit configuration as described above, but the resonance voltage appearing at both ends of the capacitor C2 is clamped to a constant level by the gate protection circuit, and the first and second voltages are supplied via the gate voltage output means GDO. It is applied between the gate and source of the second switching means Q1, Q2, and turns on the switching means Q1, Q2 alternately.

  The starting circuit ST includes resistors R1, R2, and R3.

  The resistor R1 has one end connected to the positive electrode of the rectified DC power supply RD, the other end connected to the gate of the first switching means Q1, and one end of the resistor R2 and the gate voltage of the gate drive circuit GDC. The output means GVO is connected to the output end on the gate side, that is, the other end of the capacitor C3.

  The other end of the resistor R2 is connected to a connection point between the inductor L1 of the LC resonance circuit RC and the feedback means FB.

  One end of the resistor R3 is connected to the connection point of the first and second switching means Q1, Q2, that is, the output side on the source side of each source and gate voltage output means GVO, and the other end is connected to the rectified DC power supply RD. Is connected to the negative electrode.

  The load circuit LC includes a fluorescent lamp 10 connected in parallel to the resonance capacitors C5A and C5B in addition to the series circuit of the current limiting inductor L2, the DC cut capacitor C4 and the pair of resonance capacitors C5A and C5B.

  One resonance capacitor C5A is connected to the load circuit LC through the filament of the pair of electrodes 12 of the fluorescent lamp 10.

  On the other hand, the other resonance capacitor C5B is directly connected to the load circuit LC by being connected in parallel to the fluorescent lamp 10 without a filament.

  Thus, the pair of resonant capacitors C5A and C5B is configured to resonate in series with the current limiting inductor L2 with respect to the combined capacitance connected in parallel with each other with respect to the load circuit LC.

Next, the configuration of the inductor (winding component) L1 mounted as the circuit component 22 on the wiring board 21 will be described with reference to FIGS.
As shown in FIG. 6, the bobbin 50 constituting the inductor L <b> 1 has a bottom plate 51 having a substantially rectangular flat plate shape, a bobbin support 52 standing from the top surface of the bottom plate 51, and a bottom plate 51 at the top of the bobbin support 52. The opposite flange 53 is integrally molded with resin to form a main part.

  A winding 55 constituting a coil is wound around the bobbin support 52 (see FIG. 9). Further, the bobbin support 52 is vertically penetrated from the top surface of the flange portion 53 to the bottom surface of the bottom plate 51. A through hole 56 is provided (see FIGS. 6 and 9).

  In addition, the flange portion 53 and the bottom plate 51 are provided with a groove portion 57 that is continuous with the through hole 56, and a pair of core halves having a substantially “E” shape in plan view along the through hole 56 and the groove portion 57. 59 (see FIG. 6) are respectively mounted on the bobbin 50 from above and below to constitute a core 58 serving as a magnetic core of the coil (see FIGS. 7 to 10).

  In addition, a plurality of (for example, four on one side) pin holes 60 are formed in the bottom surface of the bottom plate 51 along each of the symmetrical edge portions around the core 58. These pin holes 60 are drilled on the bottom surface at a preset pitch (for example, an equal pitch of 2.2 mm between the shafts). On the bottom plate 51, between the pin holes 60 adjacent to each other, A cutout groove 61 is provided for guiding a part of the winding 55 wound around the bobbin support 52 to the bottom surface side.

  Each pin hole 60 is configured such that the terminal pin 62 can be selectively implanted, and a pair of pin holes 60 selected according to the circuit configuration of the wiring board 21 on which the inductor L1 is mounted is selected. In the pin hole 60, each terminal pin 62 electrically connected to the winding 55 is implanted.

  In addition, among the pin holes 60 in which the terminal pins 62 are not implanted, each of the predetermined pin holes 60 has a dummy pin 63 having the same diameter as the terminal pin 62 and shorter than the terminal pin 62. Each is planted. 7, 9, and 10, the amount (length) of the dummy pin 63 protruding from the bottom surface of the bottom plate 51 is such that the bottom surface of the core 58 attached to the bobbin 50 protrudes from the bottom surface of the bottom plate 51. It is desirable that the amount (length) to be approximately equal. This is because, by setting the length of the dummy pin 63 in this way, the dummy pin 63 is brought into contact with the substrate surface together with the bottom surface of the core 58 when the inductor L1 is mounted on the wiring board, thereby stably supporting the bobbin 50. Because. Further, the number of dummy pins 63 to be implanted is not particularly limited. For example, as shown in FIG. 8, it is desirable that at least one dummy pin 63 is implanted on each side of the core 58. This is because by implanting the dummy pins 63 in this manner, the dummy pins 63 suppress wobble with the bottom surface of the core 58 as a fulcrum when the inductor L1 is mounted on the wiring board. The dummy pin 63 may be a pin member cut into a predetermined length after being planted in the pin hole 60 with a pin member cut into the same length as the terminal pin 62, or cut into a predetermined length in advance. The pin member may be implanted in the pin hole 60.

  For example, as shown in FIG. 10, the inductor L <b> 1 configured in this way is mounted on the wiring board 21 with the tips of the dummy pins 63 being in contact with the substrate surface. That is, the inductor L1 is placed on the wiring board 21 with the tip of the dummy pin 63 in contact with the surface of the board during the mounting operation, and the tip of the terminal pin 62 penetrating the wiring board 21 is placed by the solder portion 65. It is held on the wiring board 21 by being soldered.

  According to such a form, the dummy pin 63 shorter than the terminal pin 62 is planted in the pin hole 60 in which the terminal pin 62 is not planted on the bottom surface of the bottom plate 51 of the bobbin 50, whereby the inductor L1. It is possible to achieve both the reduction of the outer size and the improvement of the mounting property on the wiring board 21. That is, the dummy pin 63 is planted on the bottom surface of the bottom plate 51, and the inductor L1 is supported on the wiring board 21 by using the dummy pin 63, so that the supporting projection is omitted from the bottom surface of the bottom plate 51. Even when the size of L1 is reduced, the inductor L1 can be stably placed on the wiring board 21 during the mounting operation.

  At this time, the inductor L1 can be more stably placed on the wiring board 21 by matching the amount of protrusion of the dummy pin 63 from the bottom surface of the bottom plate 51 with the amount of protrusion of the core 58 from the bottom surface of the bottom plate 51. it can. Further, by implanting at least one dummy pin 63 on each side of the core 58, the inductor L1 can be more stably placed on the wiring board 21.

  Then, by mounting the downsized inductor L1 on the wiring board 21 to form the lighting circuit unit 20, the small lighting circuit unit 20 can be realized without causing a decrease in yield or the like. . Furthermore, the miniaturization of the light-emitting fluorescent lamp 1 can be effectively realized by the miniaturization of the lighting circuit unit 20.

  In the above-described embodiment, the configuration of the inductor L1 has been described as an example of the winding component. However, the present invention is not limited to this, and various winding components can be used without departing from the gist of the present invention. Of course, it can be applied as appropriate. For example, in this embodiment, the bottom structure of the bobbin such as the current limiting inductor L2 can be configured similarly to the above-described inductor L1.

  Of course, the circuit unit on which the winding component according to the present invention is mounted is not limited to the above-described lighting circuit unit.

Partial cross-sectional front view of a bulb-type fluorescent lamp A plan view of the globe of a bulb-type fluorescent lamp Exploded perspective view showing the main part of a bulb-type fluorescent lamp The top view which shows schematic structure of a lighting circuit unit Circuit diagram of lighting circuit unit Exploded perspective view of bobbin and core viewed from diagonally below Inductor side view Bottom view of inductor Sectional drawing which follows the II line | wire of FIG. Cross section of the main part of the inductor mounted on the wiring board

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light bulb-type fluorescent lamp, 10 ... Fluorescent lamp, 11 ... Translucent discharge vessel, 11a ... Glass tube, 11b ... Connecting tube, 12 ... Electrode, 20 ... Lighting circuit unit (circuit unit), 21 ... Wiring board, 22 ... Circuit components, 25 ... Wrapping pins, 26 ... Direct insulation coated conductors, 30 ... Envelope, 31 ... Translucent globe, 32 ... Light-shielding base, 33 ... Partition, 33a ... Fluorescent lamp support hole, 34 ... Light emission Chamber 35, circuit storage chamber, 40 ... base, 50 ... bobbin, 51 ... bottom plate, 52 ... bobbin support, 53 ... collar, 55 ... winding, 56 ... through hole, 57 ... groove, 58 ... core, 59 ... Half core 60, pin hole 61, notch groove 62 terminal pin, 63 dummy pin, 65 solder part, AS low frequency AC power supply, BRC bridge type rectifier circuit, C capacitor, C1 smoothing capacitor , C2 ... Capacitor C3 ... capacitor, C4 ... DC cut capacitor, C5A ... resonance capacitor, C5B ... resonance capacitor, FB, LC ... feedback means, GDC ... gate drive circuit, GDO ... gate voltage output means, GP ... gate protection circuit, GVO ... gate voltage Output means, HFI ... high frequency inverter, L ... inductor, L1 ... inductor (winding part), L2 ... current limiting inductor, LC ... direct load circuit, LC ... load circuit, NF ... noise filter, Q1, Q2 ... switching means, R1, R2, R3 ... resistors, RC ... resonant circuit, RD ... rectified DC power supply, ST ... start-up circuit, f ... overcurrent fuse
Agent Patent Attorney Susumu Ito

Claims (5)

A bobbin having a plurality of pin holes formed in the bottom surface of the bottom plate on which the bobbin support is erected;
A terminal pin selectively implanted in the pin hole and electrically connected to a winding wound around the bobbin post;
A winding component comprising: a dummy pin planted in the pin hole where the terminal pin is not planted, and a protruding length from the bottom surface of the bottom plate shorter than that of the terminal pin.   The winding component according to claim 1, wherein the protruding length of the dummy pin is substantially equal to a length protruding from the bottom surface of the bottom plate of the core attached to the bobbin.   The winding component according to claim 2, wherein at least one dummy pin is disposed on each side of the core.   A circuit unit comprising the winding component according to any one of claims 1 to 3 mounted on a wiring board in a state where a dummy pin of the winding component is in contact with the surface of the substrate.   5. A light bulb-type fluorescent lamp comprising the circuit unit according to claim 4 integrally as a lighting circuit unit for a fluorescent lamp.

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