JP2014203558A - Electrodeless lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrodeless lighting device which can prevent excessive heating.SOLUTION: An electrodeless lighting device 10 comprises: a stabilizer 11 which supplies a power source to an electrodeless fluorescent tube L; an induction coil 12 which generates a magnetic field by electric conduction from the stabilizer 11 and lights the electrodeless fluorescent tube L; and a housing part 13a of a shade 13 which houses the stabilizer 11 on an inner part, is attached to an attachment plate 14 having the induction coil 12 as the bottom surface and, thereby, retains the electrodeless fluorescent tube L. A slit 131 which functions as a vent hole for emitting heat from the stabiliser 11 is disposed on the housing part 13a. A bottom surface of the stabilizer 11 is separated by a nut 11d which functions as a gap securing member from the attachment plate 14. A protrusion 142 protruded in a direction of the electrodeless fluorescent tube L is formed on the attachment plate 14, and the protrusion 142 is formed as such a reflection surface that an inclination surface 142b extended toward the surrounding from an apex reflects light emitted to the hole inner direction of the electrodeless fluorescent tube L annularly formed.

Description

  The present invention relates to an electrodeless lighting device for lighting an electrodeless fluorescent tube by electromagnetic induction.

  The electrodeless lighting device is designed to flow a current of several tens of kHz to several MHz through an induction coil wound around an electrodeless fluorescent tube, generate a plasma current in the electrodeless fluorescent tube, and generate ultraviolet rays. It is an illuminating device which makes the fluorescent substance apply | coated to light-emit.

As such an electrodeless illumination device, one described in Patent Document 1 is known.
The lighting fixture of Patent Document 1 includes a housing in which an electrodeless fluorescent lamp is disposed, and a translucent panel that is formed of glass (translucent material) and is disposed so as to cover the opening of the housing, The translucent panel is provided with an air inflow hole, and an exhaust hole is provided at a position corresponding to the air inflow hole in the reflection portion. It is described that a heat radiating hole for radiating the generated heat is formed.

JP 2010-102961 A

  However, in the lighting device described in Patent Document 1, the heat generated by the ballast is radiated from the casing for the lighting device, or the heat generated by the electrodeless fluorescent tube is radiated from the casing, Although measures are taken for each heat source, no measures are taken to prevent the electrodeless fluorescent tube from transferring heat to the ballast. The electrodeless fluorescent tube emits light and reaches a high temperature of about 90 ° C. to 100 ° C. When the heat is transferred to the ballast, it affects the life of components such as an electrolytic capacitor used in the ballast circuit. In that case, it becomes difficult to ensure reliability such as lighting failure when the electrodeless lighting device is used for a long period of time.

  Therefore, the present invention provides an electrodeless lighting device that can improve reliability by dissipating heat from a ballast or electrodeless fluorescent tube and making it difficult for heat from the electrodeless fluorescent tube to be transmitted to the ballast. For the purpose.

  The electrodeless illumination device of the present invention includes a ballast that supplies power to the electrodeless fluorescent tube, an induction coil that generates a magnetic field by energization from the ballast and lights the electrodeless fluorescent tube, and the ballast And the induction coil is attached to the bottom surface, so that a housing portion for holding the electrodeless fluorescent tube is provided, and heat from the ballast is provided on the bottom surface and the upper portion of the housing portion. And a vent hole for dissipating the heat from the electrodeless fluorescent tube through the casing and dissipating the bottom of the ballast from the bottom of the casing by a clearance securing member. It is characterized by that.

  According to the electrodeless lighting device of the present invention, even if the ballast generates heat in the casing, heat can be dissipated because the vent holes are formed in the bottom and upper portions of the casing. Even if the fluorescent tube generates heat below the bottom surface of the housing part, it passes through the air holes formed in the housing part and dissipates, so that excessive heating can be prevented. Since the bottom surface of the ballast is separated from the bottom surface of the housing by the gap securing member, even if the bottom surface of the housing is heated by the electrodeless fluorescent tube, it is difficult to directly transmit to the bottom of the ballast. The air in the housing heated by the electrodeless fluorescent tube can flow around the ballast and can be dissipated to the outside through the ventilation holes in the upper portion of the housing. Therefore, it is possible to make it difficult to transfer heat from the electrodeless fluorescent tube to the ballast.

  Since the convex portion protruding in the direction of the electrodeless fluorescent tube is formed on the bottom surface of the casing portion, the heat radiation space below the ballast can be expanded, so the case heated by the electrodeless fluorescent tube It is possible to make it difficult for heat from the bottom surface of the part to be transmitted to the bottom surface of the ballast.

  It is desirable that the convex portion has an inclined surface that extends from the top toward the periphery as a reflecting surface that reflects light emitted in an in-hole direction of the electrodeless fluorescent tube formed in an annular shape. Since the inclined surface of the convex portion functions as a reflecting surface that reflects light emitted in the direction of the hole of the annular electrodeless fluorescent tube, the electrodeless lighting device of the present invention is brightly illuminated while ensuring a heat radiation space. be able to.

  When the vent hole formed in the bottom surface of the housing portion is formed at a position corresponding to the upper side of the electrodeless fluorescent tube, the vent hole from the bottom surface of the housing portion to the vent hole in the upper portion of the housing portion. Since air flows, the cooling effect can be further improved. In addition, since the ventilation holes on the bottom surface of the housing part are formed at positions corresponding to the upper side of the electrodeless fluorescent tube, the ventilation holes are not visible even when viewed from below. Can be suppressed.

  If the casing is formed in a substantially bowl shape and the vent hole formed in the upper part of the casing part is formed by a radial slit, the area of the vent hole can be reduced by increasing the length of the slit. Since it can be increased, it is possible to suppress the degree of dust mixing into the housing by expanding the width of the vent hole.

  In the electrodeless lighting device of the present invention, the air in the housing heated by the electrodeless fluorescent tube flows around the ballast and can be dissipated to the outside through the vent hole at the top of the housing. The heat from the electrodeless fluorescent tube can be made difficult to transfer to the ballast. Therefore, the electrodeless lighting device of the present invention can improve the reliability by dissipating heat from the ballast and the electrodeless fluorescent tube and making it difficult for the heat from the electrodeless fluorescent tube to be transmitted to the ballast.

It is a front view of the electrodeless lighting apparatus which concerns on embodiment of this invention. It is sectional drawing which looked at the electrodeless illumination apparatus shown in FIG. 1 from the direction along the width direction of a ballast. It is sectional drawing which looked at the electrodeless illumination apparatus shown in FIG. 1 from the direction along the length direction of a ballast. It is a bottom view of the electrodeless illumination apparatus shown in FIG. It is an enlarged view for demonstrating the structure of attachment of the ballast and attachment plate of the electrodeless illumination apparatus shown in FIG. It is a perspective view which shows the ballast of the electrodeless illumination apparatus shown in FIG.

An electrodeless lighting apparatus according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 4, the electrodeless lighting device 10 is a hanging type illumination that is installed from a ceiling C such as a factory or a warehouse by a hanging metal fitting K. The electrodeless lighting device 10 includes a ballast 11 that supplies power to the annular electrodeless fluorescent tube L, an induction coil 12 that generates a magnetic field by energization from the ballast 11 and lights the electrodeless fluorescent tube L, A shade 13 covering the electrodeless fluorescent tube L and a mounting plate 14 serving as a lid of the shade 13 with the ballast 11 disposed therein are provided.

The ballast 11 converts 200 V, 50 Hz / 60 Hz received from a power line as an AC power source into a low-frequency or high-frequency AC current and outputs it to the induction coil 12. In the present embodiment, a ballast 11 having an oscillation frequency of 140 KHz is employed. As shown in FIG. 6, the ballast 11 has a rectangular parallelepiped main body portion 11a formed of an aluminum plate in which circuit components are incorporated, and a protruding plate 11b for screwing protruding from the lower ends of both end portions of the main body portion 11a. Is formed.
As shown in FIG. 5, the ballast 11 has a nut 11d interposed between the mounting plate 14 and a bolt 11c inserted from the mounting plate 14 side, and the protruding plate 11b is sandwiched between the nut and nut 11e. It is fixed by screwing.

  As shown in FIGS. 1 to 4, in the induction coil 12, a coil part 12a is wound around an electrodeless fluorescent tube L, and a ring-shaped heat radiation part 12b is mounted on the outer periphery of the coil part 12a. The induction coil 12 holds the electrodeless fluorescent tube L by being wound around one side of the electrodeless fluorescent tube L and the other side opposite to the one side. The induction coil 12 is connected to the ballast 11 via a connector (not shown) after wiring passes through the mounting plate 14.

The shade 13 is a molded product having an overall shape formed in a bowl shape. The upper part of the shade 13 has a function of a housing part 13a with the mounting plate 14 as a bottom surface, and a lower part of the reflecting part 13b that reflects light spreading from the electrodeless fluorescent tube L and illuminates downward. Yes. The ballast 11 is accommodated in the housing portion 13a. A slit 131 that functions as a ventilation hole is formed in the upper portion of the shade 13 (housing portion 13a). The slits 131 are formed radially at equal intervals from the top to the bottom.
Ribs 132 for improving the strength of the shade 13 are formed radially and equidistantly on the inner side surface of the housing 13a from the top to the bottom.

  The attachment plate 14 is formed in a disk shape. It is attached to the shade 13 so as to divide the inner space of the shade 13. Since the mounting plate 14 becomes the bottom surface of the housing portion 13a, a storage portion S1 for storing the ballast 11 is formed. The electrodeless fluorescent tube L is arranged on the attachment plate 14 by attaching the heat radiating portion 12b of the induction coil 12. A small hole 141 that functions as a vent hole is formed in the mounting plate 14 at a position corresponding to the upper side of the electrodeless fluorescent tube L. In the present embodiment, since the electrodeless fluorescent tube L is circular, it is formed along the circumferential direction. The mounting plate 14 has a convex portion 142 that protrudes downward at the center. As for the convex part 142, the top surface 142a is formed in the circular flat surface. The convex portion 142 is formed with an inclined surface 142b having a gently curved surface that extends from the top toward the periphery. Due to the convex portion 142, the internal space of the housing portion 13 a is expanded below the ballast 11.

The operation and use state of the electrodeless lighting apparatus 10 according to the embodiment of the present invention configured as described above will be described with reference to the drawings.
As shown in FIGS. 2 and 3, when power is supplied to the ballast 11, the ballast 11 passes the oscillated current through the induction coil 12. This energization generates a high frequency magnetic field from the induction coil 12. Electromagnetic induction is generated by this high frequency magnetic field, the mercury gas in the electrodeless fluorescent tube L is excited, and ultraviolet rays are generated. When the fluorescent substance applied to the inner peripheral wall of the electrodeless fluorescent tube L is excited by the generated ultraviolet light, the electrodeless fluorescent tube L emits light.

  Heat is generated from the ballast 11 by energizing the electrodeless lighting device 10. The heat dissipated by the ballast 11 rises and is dissipated from the slit 131 to the outside. Then, new air flows from the small hole 141 of the mounting plate 14. Thereby, since the heat of the ballast 11 escapes to the outside, it is possible to prevent heat from being trapped in the housing portion 13a having the mounting plate 14 as a bottom surface.

  Since the slit 131 is vertically long and long, the slit width can be narrowed if the slit 131 has the same area as the rectangular or square vent. Therefore, the slit 131 can secure a ventilation area while suppressing the entry of foreign matters such as dust. In particular, minute dust is more effective because dust is blown out by the rising airflow due to heat radiation from the slit 131 and the intrusion of dust can be prevented.

  Further, the heat generated by the electrodeless fluorescent tube L surrounded by the reflecting portion 13b of the shade 13 flows from the small hole 141 of the mounting plate 14 serving as the bottom surface of the housing portion 13a, and enters the upper portion of the housing portion 13a. Exit to the formed slit 131. Thus, the heat from the electrodeless fluorescent tube L passes through the housing portion 13a and is radiated.

  Since the small hole 141 of the mounting plate 14 is formed at a position corresponding to the upper side of the electrodeless fluorescent tube L, when the electrodeless illumination device 10 is viewed from below, the electrodeless fluorescent tube L has the small hole 141. Since it hides, the fall of aesthetics can be suppressed, ensuring ventilation | gas_flowing.

  When the heat from the electrodeless fluorescent tube L heats the mounting plate 14, the mounting plate 14 starts to radiate heat toward the bottom surface of the ballast 11. However, as shown in FIG. 5, the ballast 11 is in a state of being connected to the mounting plate 14 by bolts 11c and nuts 11d and 11e, and the bottom surface of the main body 11a of the ballast 11 is equivalent to one nut by the nut 11d. The gap is spaced from the mounting plate 14. Therefore, even if the heat from the electrodeless fluorescent tube L heats the mounting plate 14 and the air between the mounting plate 14 and the bottom surface of the ballast 11 is heated, the heated air is moved around the ballast 11. It flows and dissipates outside through the slit 131 shown in FIGS. Therefore, it is difficult for heat from the electrodeless fluorescent tube L to be transferred to the ballast 11. Therefore, the electrodeless lighting device 10 increases the reliability by dissipating the heat from the ballast 11 and the electrodeless fluorescent tube L and making it difficult for the heat from the electrodeless fluorescent tube L to be transmitted to the ballast 11. Can do.

  Moreover, the convex part 142 which protruded in the direction of the electrodeless fluorescent tube L is formed in the attachment plate 14, and the ballast 11 is arrange | positioned so that the space which can be formed by the convex part 142 may be straddled. The lower heat radiation space S2 can be expanded from the gap corresponding to one nut. Therefore, the heat from the mounting plate 14 heated by the electrodeless fluorescent tube L can be made difficult to be transmitted to the bottom surface of the ballast 11. The convex portion 142 has an inclined surface 142b that functions as a reflecting surface that reflects light emitted in the hole direction of the annular electrodeless fluorescent tube L, thereby illuminating the electrodeless fluorescent tube L in the hole direction. Since the electrodeless illumination device 10 can be reflected downward, the electrodeless illumination device 10 can be brightly illuminated while ensuring a heat radiation space.

  Thus, since it can suppress that the inside of the housing | casing part 13a becomes abnormally high temperature by the heat_generation | fever of the electrodeless fluorescent tube L and the heat_generation | fever of the ballast 11, it can suppress that the ballast 11 is affected. Can be formed not by metal but by a molded product using a mold, the electrodeless lighting device 10 having high design can be obtained.

  In the present embodiment, the circular electrodeless fluorescent tube L is used, but it may be elliptical, spherical, or linear. In the present embodiment, the nut 11d is used as the gap ensuring member, but a cylindrical spacer or the like may be used. Moreover, although the installation position of the clearance securing member that secures the clearance between the ballast 11 and the mounting plate 14 is the same position as the fixing position with the mounting plate 14, the position where the ballast 11 is fixed to the mounting plate 14. You may arrange | position a clearance ensuring member in a different position.

  The present invention is suitable for an electrodeless illumination device that lights an electrodeless fluorescent tube by electromagnetic induction.

DESCRIPTION OF SYMBOLS 10 Electrodeless illumination apparatus 11 Ballast 11a Main body part 11b Projection plate 11c Bolt 11d, 11e Nut 12 Induction coil 12a Coil part 12b Heat radiation part 13 Sed 13a Housing | casing part 13b Reflection part 131 Slit 132 Rib 14 Mounting plate 141 Small hole 142 Convex Part 142a top surface 142b inclined surface L electrodeless fluorescent tube S1 storage part S2 heat radiation space

Claims (5)

A ballast for supplying power to the electrodeless fluorescent tube;
An induction coil that generates a magnetic field by energization from the ballast and lights the electrodeless fluorescent tube;
The ballast is housed inside, and the induction coil is attached to the bottom surface, thereby including a housing portion that holds the electrodeless fluorescent tube,
A vent hole is provided on the bottom and top of the housing part to dissipate heat from the ballast and dissipate heat from the electrodeless fluorescent tube through the housing part,
An electrodeless lighting apparatus according to claim 1, wherein a bottom surface of the ballast is separated from a bottom surface of the housing by a clearance securing member.   The electrodeless illumination device according to claim 1, wherein a convex portion protruding in a direction of the electrodeless fluorescent tube is formed on a bottom surface of the housing portion.   3. The electrodeless electrode according to claim 2, wherein the convex portion has an inclined surface that extends from the top toward the periphery as a reflecting surface that reflects light emitted in the hole direction of the electrodeless fluorescent tube formed in an annular shape. Lighting device.   The electrodeless illumination device according to any one of claims 1 to 3, wherein the vent hole formed in the bottom surface of the housing portion is formed at a position corresponding to the upper side of the electrodeless fluorescent tube. The casing is formed in a substantially bowl shape,
The electrodeless lighting device according to claim 4, wherein the vent hole formed in the upper portion of the housing part is formed by a radial slit.

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