CN220858453U

CN220858453U - Lighting device

Info

Publication number: CN220858453U
Application number: CN202321482344.1U
Authority: CN
Inventors: 矶贝俊明; 城户大志; 高桥晓良; 秋山隆行
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2022-06-13
Filing date: 2023-06-12
Publication date: 2024-04-26
Anticipated expiration: 2033-06-12
Also published as: JP2023181927A

Abstract

The disclosed subject is to realize reduction of high-frequency noise, wherein a lighting device (A1) is provided with an LED (10), a lighting circuit (20) for lighting the LED (10), and a housing (3) for accommodating the LED (10) and the lighting circuit (20), wherein the lighting circuit (20) is provided with an electric wire (21) on the input side for supplying power from the outside, and a ferrite core (22) for suppressing the high-frequency noise flowing into the electric wire (21), and the ferrite core (22) is accommodated in the housing (3), and then the lighting device (A1) can realize reduction of the high-frequency noise by making the high-frequency noise flowing into the electric wire (21) change in heat in the ferrite core (22) and consume as eddy current loss.

Description

Lighting device

Technical Field

The present disclosure relates to a lighting device, and more particularly, to a lighting device in which a light source and a lighting circuit are housed in one housing.

Background

A lighting device described in document 1 (international publication No. 2011/129309) is exemplified as a conventional example. The lighting device described in document 1 (hereinafter referred to as a conventional example) is an LED light bulb of a light bulb type. The conventional example includes a base that is fitted into an external lamp socket and electrically connected to a commercial power supply, a heat radiating portion, a connecting body that connects the base and the heat radiating portion, a hollow light transmitting portion that is substantially a hemispherical shell, an LED module, and a control portion (lighting circuit) that supplies necessary power to the LED module.

The control unit is accommodated in the accommodation unit. The accommodating portion is accommodated in the cylindrical heat dissipation portion. A base is attached to one end of the heat radiation portion. A light transmitting portion is attached to the other end of the heat radiating portion.

Further, the control unit (lighting circuit) of the conventional example has a DC/DC converter (switching power supply circuit), and it is desired to reduce switching noise (high frequency noise) generated from the DC/DC converter.

Disclosure of utility model

Problems to be solved by the utility model

An object of the present disclosure is to provide a lighting device capable of realizing reduction of high-frequency noise.

Means for solving the problems

The lighting device according to claim 1 of the present disclosure includes: a light source; a lighting circuit for lighting the light source; and a case for accommodating the light source and the lighting circuit. The lighting circuit includes: an input-side circuit for supplying power from outside; and a ferrite core for suppressing high-frequency noise flowing into the circuit. The ferrite core is accommodated in the case.

A lighting device according to claim 2 of the present disclosure is the lighting device according to claim 1, wherein the housing includes: a cylindrical base portion; a lamp part arranged at the 1 st end of the base part in the axial direction; and a light-transmitting portion covering the 2 nd end of the base portion in the axial direction. The light source is disposed at the 2 nd end of the base portion. The lighting circuit is accommodated in the base portion. The circuit is electrically connected to the base unit. The ferrite core is accommodated in the base part.

The lighting device according to claim 3 of the present disclosure is the lighting device according to claim 1 or 2, wherein the circuit includes two wires. The ferrite core is formed in a ring shape having a hole in the center. The two wires are inserted into the holes.

The lighting device according to claim 4 of the present disclosure is the lighting device according to claim 1 or 2, further comprising an insulator formed of an electrically insulating material, and surrounding the ferrite core.

A lighting device according to claim 5 of the present disclosure is the lighting device according to claim 3, wherein the lighting circuit includes a plurality of ferrite cores. The two wires are inserted into the holes of each of the plurality of ferrite cores.

A lighting device according to claim 6 of the present disclosure is the lighting device according to claim 2, wherein the lighting circuit includes a plurality of ferrite cores. The ferrite cores are each formed in a ring shape having a hole in the center. The plurality of ferrite cores are housed in a state of being aligned in a row so that the respective holes are connected to each other, along an axial direction of the base unit.

A lighting device according to claim 7 of the present disclosure is the lighting device according to claim 3, wherein the fuse resistor is inserted in the middle of at least 1 of the electric wires. At least a portion of the fuse resistor is inserted into the aperture.

ADVANTAGEOUS EFFECTS OF INVENTION

The lighting device of the present disclosure has an effect of enabling reduction of high-frequency noise.

Drawings

Fig. 1 is a front view of a lighting device of a related embodiment of the present disclosure.

Fig. 2 is an exploded perspective view of a lighting device of a related embodiment of the present disclosure.

Fig. 3 is a cross-sectional view of a lighting device of a related embodiment of the present disclosure.

Fig. 4 is a bottom view of the lighting device according to the embodiment of the present disclosure, with the base part omitted.

Fig. 5 is a circuit block diagram of a lighting device of a related embodiment of the present disclosure.

Description of the drawings

A1 an illumination device; 3, a shell; 4a base portion; the 1 st end of the 4A base part; the 2 nd end of the 4B base part; 5, a lamp head part; 6, ball cover; 10LED (light source); a 20-point lighting circuit; 21 wires (circuits); a 22 ferrite core; 23 insulators; 220 holes.

Detailed Description

The lighting device A1 according to the embodiment of the present disclosure is described in detail below with reference to the drawings. However, each of the drawings described in the following embodiments is a schematic drawing, and the respective ratios of the sizes and thicknesses of the constituent elements do not necessarily reflect actual dimensional ratios. The configuration described in the following embodiment is merely an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be achieved.

(1) Summary of the inventionsummary

The lighting device A1 according to the embodiment includes: a light source, a lighting circuit 20 for lighting the light source, and a housing 3 for housing the light source and the lighting circuit 20. The light source is a white LED (LIGHT EMITTING Diode) for illumination. However, the light source may be a light emitting element other than an LED, for example, an organic electroluminescent element, a semiconductor laser, or the like.

The lighting circuit 20 has a circuit on the input side for supplying power from the outside, and a ferrite core 22 for suppressing high-frequency noise flowing into the circuit. The ferrite core 22 is accommodated in the case 3.

The circuit is, for example, an electric wire 21 made of a linear conductor. The current flowing in the circuit (the electric wire 21) may contain noise (high-frequency noise) having a frequency sufficiently higher than the frequency (50 Hz or 60 Hz) of the ac voltage supplied from the outside.

In the case where high-frequency noise flows in the circuit (the electric wire 21), magnetic flux generated around the circuit (the electric wire 21) passes through the ferrite core 22 so that eddy current flows in the ferrite core 22. That is, the lighting device A1 according to the embodiment can realize reduction of high-frequency noise by consuming the high-frequency noise flowing into the circuit (the electric wire 21) as eddy current loss by thermally changing the high-frequency noise in the ferrite core 22.

Here, ferrite cores are often provided in power cables led out from the housing of an electrical device for the purpose of reducing noise. In contrast, in the lighting device A1 according to the embodiment, the ferrite core 22 is housed in the housing 3. Therefore, the lighting device A1 according to the embodiment can reduce high-frequency noise leaking to the outside through the base (base), even when power is supplied from the outside through the base (base), for example, as in the case of an LED bulb.

(2) Detailed description

The lighting device A1 according to the embodiment (hereinafter simply referred to as a lighting device A1) is a bulb-shaped LED lamp for general lighting (see fig. 1). The lighting device A1 includes an LED unit 1, a lighting unit 2, and a housing 3. However, the lighting device A1 is not limited to the bulb-shaped LED lamp, and may be a straight tube-shaped LED lamp, for example.

(2-1) LED Unit

The LED unit 1 includes an LED10, a holder 11, a screw 12, a lead wire 13, and a light guide 14 (see fig. 2).

The LED10 is a COB (Chip on board) -type light emitting diode for illumination. The LED10 includes a square mounting substrate 100, a circular light emitting portion 101 provided at the center of the surface of the mounting substrate 100, and a pair of electrode portions 102 provided at the periphery of the light emitting portion 101 of the surface of the mounting substrate 100. The light emitting section 101 includes, for example, 1 or more LED chips that emit blue light, and a sealing resin that seals the LED chips. The sealing resin contains a phosphor that converts the wavelength of blue light emitted from the LED chip into yellow light. Thus, the light (illumination light) emitted from the light emitting unit 101 becomes white light obtained by mixing blue light and yellow light.

One electrode 102 is electrically connected to the positive electrode (anode) of the light-emitting unit 101. The other electrode 102 is electrically connected to the negative electrode (cathode) of the light-emitting unit 101. Each electrode 102 is electrically connected to one lead 13 (see fig. 2). That is, the LED10 emits light (lights) by flowing a direct current through the two leads 13.

The bracket 11 is formed in a square frame shape from a synthetic resin having electrical insulation properties. The holder 11 supports the periphery of the mounting substrate 100 of the LED 10. The bracket 11 is screwed to the housing 3 by two screws 12 in a state where the LED10 is supported (see fig. 2).

The light guide 14 includes a cap 140 having a bottomed cylindrical shape, and a light distribution control portion 141 formed in a horn shape and protruding from the center of the bottom surface of the cap 140. The cap 140 and the light distribution control portion 141 are preferably integrally formed of a light-transmitting synthetic resin such as an acrylic resin or a polycarbonate resin.

The light guide 14 is configured such that the LED10 is covered by the cap 140 (see fig. 3). The light guide 14 guides light (illumination light) emitted from the LED10 from the cap 140 to the light distribution control unit 141 and emits the light from the surface of the light distribution control unit 141, thereby enabling a wide-range light distribution.

(2-2) Lighting Unit

The lighting unit 2 has a lighting circuit 20. As shown in fig. 5, the lighting circuit 20 includes a rectifier 200, a smoothing capacitor 201, a filter 202, a switching power supply circuit 203, and the like. The rectifier 200 is a diode bridge, and full-wave rectifies an ac voltage of a sine wave supplied from an ac power source P1. The smoothing capacitor 201 is an electrolytic capacitor, and smoothes the pulsating voltage full-wave rectified by the rectifier 200. The filter 202 includes a common mode choke coil (choke coil).

The switching power supply circuit 203 includes, for example, an insulated DC-DC converter such as a flyback converter (Flyback Converter). The switching power supply circuit 203 steps down and stabilizes the dc voltage input through the filter 202 and outputs the dc voltage. In addition, switching noise (high frequency noise) occurs because the switching element of the switching power supply circuit 203 is switched at high frequency.

The switching power supply circuit 203 supplies a direct current to the LED10 via the pair of leads 13. The switching power supply circuit 203 operates so that the dc current flowing through the LED10 matches a target value.

The lighting circuit 20 has a rectangular printed wiring board 204 (see fig. 2 and 3). Various electronic components are mounted on both sides of the printed wiring board 204. That is, the lighting circuit 20 is constituted by the printed wiring board 204 and a printed circuit formed by these electronic components.

The lighting circuit 20 includes a pair of wires 21 and a plurality of (4 in the present embodiment) ferrite cores 22 (see fig. 2 and 3). The pair of electric wires 21 is, for example, a single wire of a copper wire, an aluminum wire, or an aluminum alloy wire. However, at least a part of each wire 21 may be covered with an insulator. One end of each wire 21 is soldered to an end of the printed wiring board 204. In addition, a fuse resistor may be inserted in the middle of the electric wire 21 to protect the lighting circuit 20 from an overcurrent. In this case, the fuse resistor may be inserted in the middle of one of the wires 21, or may be inserted in the middle of both of the wires 21.

The ferrite cores 22 are each formed in a circular ring shape having a hole 220 in the center. The 4 ferrite cores 22 are supported by the insulator 23 in a state of being aligned in a row so that the respective holes 220 are connected (see fig. 2 and 3). The insulator 23 is a so-called heat shrinkable tube. A pair of wires 21 are inserted into holes 220 of each of the plurality of ferrite cores 22 (see fig. 4). However, the number of ferrite cores 22 is not limited to 4, but may be 1 or more and less than 4, or 5 or more. The number of the wires 21 inserted into the holes 220 of the ferrite core 22 is not limited to two, but may be 1. In addition, each wire 21 may be inserted into the hole 220 of the different ferrite core 22. Further, each wire 21 may be wound around the ferrite core 22. In addition, in the case of inserting the fuse resistor in the middle of the electric wire 21, the fuse resistor may be inserted into the hole 220 of the ferrite core 22.

(2-3) Housing

The housing 3 includes a cylindrical base portion 4, a base portion 5 provided at an axial 1 st end 4A of the base portion 4, and a globe 6 (see fig. 2 and 3) covering an axial 2 nd end 4B of the base portion 4. The housing 3 also has a heat sink member 7.

The base portion 4 includes a cylindrical main body portion 40 and a receiving portion 41 having an L-shaped cross section and protruding in the radial direction from the entire outer peripheral surface of the main body portion 40. The main body 40 and the receiving portion 41 are integrally formed as a molded body of synthetic resin. Further, a male screw portion 400 is provided on the outer peripheral surface of the 1 st end (1 st end 4A of the base portion 4) of the main body portion 40.

The lamp portion 5 has a shell portion 50, an insulating portion 51, and an eyelet portion 52. The case portion 50 is formed of a metal material in a bottomed tubular shape and is electrically connected to one of the electric wires 21. However, a thread ridge is formed on the outer circumferential surface and the inner circumferential surface of the shell portion 50. The insulating portion 51 is formed in a truncated cone shape from a material having electrical insulation. An insulating portion 51 is mounted at a lower end of the shell portion 50. The hole portion 52 is formed in a disk shape from a conductive material (for example, metal) and is electrically connected to the other wire 21. The hole portion 52 is fixed to the front end (lower end) of the insulating portion 51. That is, the eyelet portion 52 is coupled to the shell portion 50 via the insulating portion 51, and is electrically insulated from the shell portion 50 by the insulating portion 51. The male screw portion 400 of the main body portion 40 is screwed (screwed) into a thread ridge formed on the inner peripheral surface of the shell portion 50, whereby the lamp portion 5 is coupled with the base portion 4 (see fig. 3).

The heat sink 7 is formed into a bottomed cylindrical shape by die casting of a good conductor of heat, for example, aluminum or an aluminum alloy. The LED10 held by the holder 11 is mounted on the outer surface (upper surface in fig. 2) of the bottom 70 of the heat sink member 7. At this time, the back surface (lower surface) of the mounting substrate 100 of the LED10 is in contact with the outer surface of the bottom 70 of the heat sink 7, so that heat generated by the LED10 during lighting is conducted to the heat sink 7. The pair of leads 13 of the LED unit 1 are respectively introduced into the heat dissipation member 7 through the through holes provided in the bottom portion 70. The heat sink 7 is attached to the base portion 4 so as to house the main body portion 40 therein (see fig. 3). The pair of claws 401 provided in the main body 40 are engaged with the edges of the pair of engagement holes 71 provided in the peripheral wall, whereby the heat radiation member 7 is fixed to the base portion 4 (see fig. 2 and 3).

The dome 6 has a spherical shell-shaped dome body 60 and a truncated cone-shaped neck 61 protruding from the dome body 60. But the front end of the neck 61 is open. The ball cover 6 and the neck portion 61 are integrally formed of a synthetic resin material (acrylic resin, polycarbonate resin, or the like) or glass having light transmittance (see fig. 2). The ball cover 6 accommodates the tip of the neck 61 in the receiving portion 41, and is fixed to the base portion 4 by the adhesive 8 filled in the receiving portion 41 (see fig. 3).

(2-4) Assembling step of Lighting device

Next, the assembling procedure of the lighting device A1 will be described. However, the assembly steps described below are examples, and the order of some steps may be replaced, or other steps may be added.

First, an operator who performs an assembling operation inserts the lighting unit 2 into the main body 40 from the opening at the 2 nd end 4B of the base portion 4 with the plurality of ferrite cores 22 and the smoothing capacitor 201 facing downward. Further, since the plurality (4) of ferrite cores 22 are enclosed by the insulator 23 (heat shrinkable tube), the plurality of ferrite cores 22 are not scattered, and workability of assembly work can be improved. Further, the surfaces of the plurality of ferrite cores 22 are covered with the insulator 23, whereby the insulation distance between the plurality of ferrite cores 22 and the charging portion (base portion 5) can be ensured.

Here, the worker attaches the lighting unit 2 to the main body 40 (base portion 4) by fitting a pair of protrusions 205 provided at the upper end of the printed wiring board 204 into a pair of grooves 402 provided at the opening end of the main body 40 (see fig. 2 and 3). Further, one ends of the pair of leads 13 are soldered to the upper portion of the printed wiring board 204.

Then, the operator welds one wire 21 of the pair of wires 21 protruding from the opening at the lower end (1 st end 4A of the base portion 4) of the main body portion 40 to the shell portion 50 of the base portion 5, and welds the other wire 21 to the eyelet portion 52 of the base portion 5. Then, the worker screws the male screw portion 400 into the shell portion 50, thereby coupling the lamp portion 5 with the base portion 4. However, the worker may weld the pair of wires 21 to the shell portion 50 and the eyelet portion 52 one by one after joining the base portion 4 to the base portion 5.

Next, the worker screws the bracket 11 holding the LED10 to the bottom 70 of the heat sink 7 by two screws 12. Then, the worker covers the heat sink 7 on the main body 40 while drawing the pair of leads 13 out of the heat sink 7 through the holes in the bottom 70. Next, the worker engages the pair of claws 401 of the main body 40 with the edges of the pair of engagement holes 71 of the heat sink 7 one by one, thereby fixing the heat sink 7 to the base 4. Further, the operator welds one lead wire 13 to one electrode portion 102 of the LED10, and welds the other lead wire 13 to the other electrode portion 102 of the LED 10.

Next, the worker attaches the light guide 14 to the front end of the heat radiation member 7. The worker attaches the light guide 14 to the heat sink 7 by engaging a pair of claws 142 provided at the open end of the cap 140 with the edges of a pair of engaging holes 72 provided in the peripheral wall of the heat sink 7 (see fig. 3).

Finally, the worker inserts the light guide 14 and the heat radiation member 7 into the spherical cap body 60 from the opening of the neck portion 61, accommodates the opening end of the neck portion 61 in the receiving portion 41 of the base portion 4, and fills the receiving portion 41 with the adhesive to cure the same. As a result, the ball cover 6, the case 3, and the heat sink 7 are bonded by the cured adhesive 8 (see fig. 3).

Through the above assembly steps, the assembly work of the lighting device A1 is completed.

(2-5) Advantages of the Lighting device of the related embodiments

As described above, the lighting device A1 inserts the electric wire 21 on the input side for supplying power to the lamp circuit 20 from the outside into (the hole 220 of) the ferrite core 22. Therefore, the lighting device A1 absorbs the high-frequency noise generated by the lighting circuit 20 (mainly the switching noise generated by the switching power supply circuit 203) by the ferrite core 22, and can reduce the high-frequency noise leaking to the ac power supply P1. In the lighting device A1, in order to reduce high-frequency noise, it is preferable that the ferrite material of the ferrite core 22 is ni—zn or mn—zn based. Further, in the lighting device A1, since the pair of wires 21 are inserted into the hole 220 of the ferrite core 22, it is possible to reduce common mode noise mainly leaking from the lighting circuit 20 to the outside. However, the lighting device A1 may be configured to reduce normal mode noise mainly leaking from the lighting circuit 20 to the outside by inserting one of the wires 21 into the hole 220 of the ferrite core 22.

Further, since the lighting device A1 inserts the electric wire 21 into the holes 220 of the plurality of ferrite cores 22, further reduction of high-frequency noise can be achieved as compared with the case where the electric wire 21 is inserted into the holes 220 of 1 ferrite core 22.

In the case of a lighting fixture having a plurality of sockets, 1 bulb-shaped LED lamp is mounted on each of the plurality of sockets for use. At this time, a plurality of bulb-shaped LED lamps are electrically connected to the same power supply line. Therefore, since high-frequency noise of a plurality of bulb-shaped LED lamps leaks into one power supply line, there is a possibility that the level of noise allowed as a lighting fixture is exceeded.

In contrast, in the lighting fixture using the plurality of lighting devices A1, since the high-frequency noise is reduced by each lighting device A1, the high-frequency noise leaking from the lighting fixture to the outside is easily suppressed to be smaller than the standard upper limit value.

The lighting device A1 further includes a ferrite core 22 housed in the base unit 5 (a space surrounded by the base unit 5 in the main body unit 40). Therefore, the lighting device A1 can shorten the length of the circuit (the electric wire 21) compared with the case where the ferrite core 22 is housed in the space apart from the base part 5 in the main body part 40. As a result, the lighting device A1 can realize further reduction of high-frequency noise.

Further, in the lighting device A1, 4 ferrite cores 22 are housed in a row so as to connect the respective holes 220 in the axial direction of the base unit 5 (see fig. 3 and 4). Therefore, in the lighting device A1, by housing the plurality of ferrite cores 22 in the base unit 5, it is possible to ensure a sufficient insulation distance between the plurality of ferrite cores 22 and the charging unit (base unit 5) while effectively utilizing the dead space in the housing 3.

(3) Summary

The lighting device (A1) according to claim 1 of the present disclosure includes a light source (LED 10), a lighting circuit (20) for lighting the light source, and a housing (3) for housing the light source and the lighting circuit (20). The lighting circuit (20) has a circuit (wire (21)) on the input side for supplying power from the outside, and a ferrite core (22) for suppressing high-frequency noise flowing into the circuit. A ferrite core (22) is housed in the case (3).

The lighting device (A1) according to claim 1 can reduce high-frequency noise by consuming eddy current loss by thermally changing the high-frequency noise flowing into the circuit (wire 21) in the ferrite core (22).

The lighting device (A1) according to claim 2 of the present disclosure can be realized by combining with claim 1. In the lighting device (A1) according to claim 2, the housing (3) preferably includes a cylindrical base portion (4), a base portion (5) provided at an axial 1 st end (4A) of the base portion (4), and a light-transmitting portion (spherical cap 6) covering an axial 2 nd end (4B) of the base portion (4). The light source is preferably arranged at the 2 nd end (4B) of the base part (4). The lighting circuit (20) is preferably housed in the base portion (4). The circuit is preferably electrically connected to the base part (5). The ferrite core (22) is preferably housed in the base part (5).

In the lighting device (A1) according to claim 2, the length of the circuit is shortened, so that further reduction of high-frequency noise can be achieved.

The lighting device (A1) according to claim 3 of the present disclosure can be realized by combining with claim 1 or claim 2. In the lighting device (A1) pertaining to claim 3, the circuit preferably includes two wires (21). The ferrite core (22) is preferably formed in a ring shape having a hole (220) in the center. The two wires (21) are preferably inserted in the holes (220).

The lighting device (A1) according to claim 3 can reduce high-frequency noise (common mode noise) leaking to the outside via the two wires (21).

The lighting device (A1) according to claim 4 of the present disclosure can be realized by combining with claim 1 or claim 2. The lighting device (A1) according to claim 4 preferably further comprises an insulator (23), and the insulator (23) is formed of an electrically insulating material and encloses the ferrite core (22).

In the lighting device (A1) according to claim 4, the insulation distance between the ferrite core (22) and the base part (5) can be ensured by the insulator (23).

The lighting device (A1) according to claim 5 of the present disclosure can be realized by combining with claim 3. In the lighting device (A1) according to claim 5, the lighting circuit (20) preferably has a plurality of ferrite cores (22). Preferably, two wires (21) are inserted into holes (220) of each of the ferrite cores (22).

In the lighting device (A1) according to claim 5, two wires (21) are inserted into the holes (220) of the ferrite cores (22), thereby further reducing high-frequency noise (common mode noise) leaking to the outside.

The lighting device (A1) according to claim 6 of the present disclosure can be realized by combining with claim 2. In the lighting device (A1) according to claim 6, the lighting circuit (20) preferably has a plurality of ferrite cores (22). The ferrite cores (22) are preferably each formed in a ring shape having a hole (220) in the center. The plurality of ferrite cores (22) are preferably housed in a state of being aligned in a row so that the holes (220) are connected to each other, along the axial direction of the base part (5).

In the lighting device (A1) according to claim 6, by housing the plurality of ferrite cores (22) in the base part (5), a sufficient insulation distance can be ensured between the plurality of ferrite cores (22) and the base part (5) while effectively utilizing the dead space in the housing (3).

The lighting device (A1) according to claim 7 of the present disclosure can be realized by combining with claim 3. In the lighting device (A1) according to claim 7, it is preferable that the fuse resistor is inserted in the middle of at least 1 wire (21). Preferably, at least a portion of the fuse resistor is inserted in the aperture (220).

The lighting device (A1) according to claim 7 can protect the lighting circuit (20) from an overcurrent by the fuse resistor.

Claims

1. A lighting device is characterized in that,

The device is provided with:

A light source;

A lighting circuit for lighting the light source; and

A housing for housing the light source and the lighting circuit,

The lighting circuit includes:

An input-side circuit for supplying power from outside; and

Ferrite core for suppressing high frequency noise flowing into the circuit,

The ferrite core is accommodated in the case.

2. A lighting device as recited in claim 1, wherein,

The housing has:

A cylindrical base portion;

a lamp part arranged at the 1 st end of the base part in the axial direction; and

A light-transmitting part covering the 2 nd end of the base part in the axial direction,

The light source is arranged at the 2 nd end of the base part,

The lighting circuit is accommodated in the base portion,

The circuit is electrically connected to the base part,

The ferrite core is accommodated in the base part.

3. A lighting device as recited in claim 1 or 2, wherein,

The above-described circuit comprises two wires which,

The ferrite core is formed in a ring shape having a hole in the center,

The two wires are inserted into the holes.

4. A lighting device as recited in claim 1 or 2, wherein,

The ferrite core is also provided with an insulator formed of an electrically insulating material, and the ferrite core is wrapped.

5. A lighting device as recited in claim 3, wherein,

The lighting circuit has a plurality of ferrite cores,

The two wires are inserted into the holes of each of the plurality of ferrite cores.

6. A lighting device as recited in claim 2, wherein,

The lighting circuit has a plurality of ferrite cores,

The ferrite cores are formed in a ring shape having a hole in the center,

The plurality of ferrite cores are housed in a state of being aligned in a row so that the respective holes are connected to each other, along an axial direction of the base part.

7. A lighting device as recited in claim 3, wherein,

A fuse resistor is inserted in the middle of at least one of the wires,

At least a portion of the fuse resistor is inserted into the aperture.