CN220540905U

CN220540905U - Lighting device

Info

Publication number: CN220540905U
Application number: CN202321932263.7U
Authority: CN
Inventors: 矶贝俊明; 富山贤司; 城户大志
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2022-07-29
Filing date: 2023-07-21
Publication date: 2024-02-27
Anticipated expiration: 2033-07-21
Also published as: JP2024018340A

Abstract

The disclosed lighting device is provided with a light source, a lighting circuit, a fuse resistor (220), a glass fiber woven tube (221), and a fixing member (222), wherein the lighting circuit is provided with a circuit for supplying power from the outside on the input side, and the lighting circuit lights the light source. The fuse resistor (220) is provided in the circuit (21) of the lighting circuit, the glass fiber braided tube (221) covers the fuse resistor (220), the fixing member (222) covers the glass fiber braided tube (221), and the glass fiber braided tube (221) is fixed to the circuit (21).

Description

Lighting device

Technical Field

The present disclosure relates to a lighting device, and more particularly, to a lighting device including a fuse resistor.

Background

Japanese laid-open patent publication No. 2014-220184 (hereinafter referred to as "document 1") discloses a lamp (lighting device) including a fuse resistor (fuse resistance).

In the lamp disclosed in document 1, the fuse resistor is housed in a protective body such as glass fiber, and the heat shrinkage tube is located between the fuse resistor and the protective body.

However, in the lamp of document 1, heat generated in the fusing resistor is thermally conducted to the heat shrinkage tube. Therefore, the temperature rise rate of the fuse resistor decreases, and when an overcurrent flows through the fuse resistor, the time required until the fuse resistor blows may become long.

Disclosure of Invention

Problems to be solved by the utility model

An object of the present disclosure is to provide a lighting device in which a fuse resistor is quickly fused in the case where an overcurrent flows in the fuse resistor.

Means for solving the problems

An illumination device according to an aspect of the present disclosure includes a light source, a lighting circuit, a fuse resistor, a glass fiber braided tube, and a fixing member. The lighting circuit has an input side circuit for supplying power from the outside, and lights the light source. The fuse resistor is provided in the circuit of the lighting circuit. The glass fiber braided tube covers the fusing resistor. The fixing member covers the glass fiber woven tube and fixes the glass fiber woven tube to the circuit.

In another aspect of the lighting device according to the present disclosure, the fixing member integrally covers the glass fiber woven tube and the fuse resistor.

In the lighting device according to another aspect of the present disclosure, the fixing member is a heat shrink tube.

In addition, the lighting device according to another aspect of the present disclosure further includes a base and a base. The base accommodates the light source and the lighting circuit. The lamp cap is arranged at one end of the base.

In another aspect of the lighting device according to the present disclosure, the circuit of the lighting circuit electrically connects the base and the lighting circuit. The fuse resistor is located between the lamp cap and the lighting circuit.

Further, a lighting device according to another aspect of the present disclosure includes a light source, a lighting circuit, a fuse resistor, an insulating member, and a fixing member. The lighting circuit has an input side circuit for supplying power from the outside, and lights the light source. The fuse resistor is provided in the circuit of the lighting circuit. The insulating member covers the fuse resistor with a gap therebetween. The fixing member covers the insulating member and fixes the insulating member to the circuit.

In the lighting device according to another aspect of the present disclosure, the insulating member is a glass fiber woven tube.

In another aspect of the lighting device according to the present disclosure, the fixing member integrally covers the insulating member and the fuse resistor.

Effects of the utility model

According to the lighting device of the embodiment of the present disclosure, when an overcurrent flows through the fuse resistor, the fuse resistor is quickly fused.

Drawings

Fig. 1 is a front view of a lighting device according to embodiment 1.

Fig. 2 is an exploded perspective view of the lighting device according to embodiment 1.

Fig. 3 is a front view of a lighting circuit of the lighting device according to embodiment 1.

Fig. 4 is a circuit block diagram of the lighting device according to embodiment 1.

Fig. 5 is a cross-sectional view of a fuse portion of the lighting device according to embodiment 1.

Fig. 6 is a cross-sectional view of a fuse portion of the lighting device according to embodiment 2.

Description of the reference numerals

1a lighting device; 12LED element (light source); a 20-point lighting circuit; a 21 circuit; 220 fusing a resistor; 221 insulating member (glass fiber woven tube); 221a insulating member; 222 fixing the component; sp1 gap; 4, a base; 4A end 1 (one end); and 5 lamp holders.

Detailed Description

The lighting devices according to embodiments 1 to 2 will be described 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.

(embodiment 1)

(1) Summary of the utility modelsummary

As shown in fig. 1 to 4, the lighting device 1 according to embodiment 1 includes a light source 12, a lighting circuit 20 for lighting the light source 12, and a case 3 for housing the light source 12 and the lighting circuit 20. The light source 12 is white LED (Light Emitting Diode) for illumination. However, the light source 12 may be a light emitting element other than an LED, for example, an organic electroluminescent element, a semiconductor laser, or the like.

As shown in fig. 2 to 4, the lighting circuit 20 has an input-side circuit 21 for supplying power from the outside. A fuse 22 including a fuse resistor 220 is formed in the circuit 21. The fuse 22 is housed in the case 3.

The circuit 21 includes a plurality of wires 211 and 212 made of, for example, a wire-like conductor. When an abnormality occurs in the lighting circuit 20, an abnormally large current (overcurrent) may flow through the circuit 21.

When an overcurrent flows through the circuit 21, the temperature of the fuse resistor 220 increases due to joule heat generated by the fuse resistor 220 included in the fuse unit 22, and the fuse resistor 220 fuses. This can shorten the time for which the overcurrent flows in the lighting circuit 20.

Here, in the lighting device 1 according to embodiment 1, as described later, the degree of diffusion of joule heat from the fuse resistor 220 in the fuse portion 22 is reduced. As a result, when an abnormality occurs in the lighting circuit 20, the fuse resistor 220 is easily fused, and thus, the time for which an overcurrent flows in the lighting circuit 20 can be shortened.

(2) Detailed description of the preferred embodiments

The lighting device 1 according to embodiment 1 is a bulb-type LED lamp for general lighting (see fig. 1). The lighting device 1 includes an LED module 10 (see fig. 2), a lighting unit 2 (see fig. 4), and a case 3 (see fig. 1 and 2). However, the lighting device 1 is not limited to the bulb-type LED lamp, and may be, for example, a straight tube-type LED lamp.

(2-1) LED Module

As shown in fig. 2, the LED module 10 has a module substrate 11, LED elements 12, screws 13, and connectors 14.

The module substrate 11 is, for example, a disk-shaped mounting substrate. The module substrate 11 has a through hole for passing the screw 13 therethrough. The module substrate 11 has a through hole in the center. The module substrate 11 further includes a wiring layer for electrically connecting the LED element 12 and the connector 14.

The LED element 12 is, for example, a SMD (Surface Mount Device) type light emitting diode for illumination. The LED element 12 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 LED element 12 becomes white light obtained by mixing blue light and yellow light. The LED elements 12 are arranged in a circular ring shape on the surface of the module substrate 11, for example.

The connector 14 is disposed on the module board 11 so as to seal the through hole in the central portion of the module board 11. The connector 14 is physically and electrically connected to a circuit on the output side of the lighting circuit 20. The connector 14 has, for example, two through holes and a contact terminal provided so as to block the two through holes. The contact terminals are connected to the LED element 12 via the wiring layers of the module substrate 11. The contact terminals are connected to circuits on the output side of the lighting circuit 20, respectively.

(2-2) Lighting Unit

The lighting unit 2 has a lighting circuit 20. As shown in fig. 4, 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 lighting circuit 20 is connected to a power source P1. The power source P1 is, for example, a commercial power source. The power source P1 may be a phase control type dimmer connected to a commercial power source. The rectifier 200 is, for example, a diode bridge, and full-wave rectifies a voltage supplied from the power source P1. The rectifier 200 may be a circuit that half-wave rectifies a voltage supplied from the power source P1. The smoothing capacitor 201 is an electrolytic capacitor, and smoothes the pulsating voltage rectified by the rectifier 200. The filter 202 includes a common mode choke (choke).

The switching power supply circuit 203 has 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 stepped down dc voltage.

The switching power supply circuit 203 supplies a direct current to the LED element 12 via a connection portion 205 (see fig. 2 and 3) which is a circuit on the output side. The switching power supply circuit 203 operates so that the dc current flowing to the LED element 12 matches the 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 has a printed circuit including the printed wiring board 204 and electronic components thereof.

The circuit 21 on the input side of the lighting circuit 20 has a pair of electric wires 211, 212 (see fig. 3 and 4). The electric wires 211, 212 are, for example, single wires of copper wires, aluminum wires, or aluminum alloy wires, respectively. However, at least a part of each of the electric wires 211 and 212 may be covered with an insulator. One end of the electric wire 211 and one end of the electric wire 212 are soldered to the ends of the printed wiring board 204, respectively.

The lighting circuit 20 further includes a fuse 22 (see fig. 3). The fuse portion 22 protects the lighting circuit 20 from an overcurrent. The fuse 22 is inserted in the middle of the electric wire 211. The fusing part 22 is located between the printed wiring board 204 and the base 5, for example. The fuse 22 may be inserted in the middle of the electric wire 212, or may be inserted in both the middle of the electric wire 211 and the middle of the electric wire 212.

The lighting circuit 20 further includes a connection portion 205 (see fig. 2 and 3). The connection portion 205 is a pair of metal pins, and protrudes from the printed wiring board 204 toward the LED module 10. The connection portion 205 is physically and electrically connected to the contact terminal of the connector 14 by penetrating the through-hole in the center of the module substrate 11 of the LED module 10 and the through-hole of the connector 14.

(2-3) Box body

As shown in fig. 1 and 2, the case 3 includes a cylindrical base 4, a base 5 provided at a 1 st end 4A of the base 4 in the axial direction, a globe 6 covering a 2 nd end 4B of the base 4 in the axial direction, and a heat radiating member 7.

The base 4 has a cylindrical inner tube 40 and a truncated cone-shaped outer tube 41 covering the inner tube 40. The inner tube 40 and the outer tube 41 are integrally formed as a synthetic resin molded body. 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 4) of the outer tube 41. Further, a screw hole 42 into which the screw 13 is inserted is provided in the inner tube portion 40.

As shown in fig. 1 and 2, the base 5 has a shell portion 50, an insulating portion 51, and an eye portion (eyelet) 52. The case portion 50 is formed of a metal material in a bottomed tubular shape, and is electrically connected to the electric wire 212 (see fig. 3 and 4). Here, a thread ridge is formed on the outer peripheral surface 501 and the inner peripheral surface 502 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 material having conductivity (for example, metal), and is electrically connected to the electric wire 211. 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 base 5 is coupled to the base 4 by screwing the male screw portion 400 of the inner tube portion 40 to the screw thread ridge formed on the inner peripheral surface 502 of the shell portion 50 (see fig. 2).

The heat sink 7 is formed into a truncated cone shape by die casting of a good conductor such as aluminum or an aluminum alloy. The LED module 10 mounted with the LED element 12 is mounted on the outer surface (upper surface of fig. 2) of the bottom 70 of the heat sink member 7. At this time, the back surface (lower surface) of the module substrate 11 is in contact with the outer surface of the bottom 70 of the heat sink 7, and heat generated by the LED element 12 at the time of lighting is conducted to the heat sink 7. The connection portion 205 of the lighting circuit 20 is connected to the connector 14 of the LED module 10 through a through hole 701 provided in the bottom portion 70 (see fig. 2). The heat dissipation member 7 has a through hole 702 for passing through the screw 13. Accordingly, the heat sink 7 is fixed to the mount 4 with the LED module 10 and the mount 4 interposed therebetween (see fig. 2).

(3) Detailed structure of fusing part

As shown in fig. 3 and 4, the fuse 22 according to embodiment 1 is located between the base 5 and the lighting circuit 20. As shown in fig. 5, the fuse 22 includes a fuse resistor 220, an insulating member 221, and a fixing member 222. In fig. 5, the fuse resistor 220 and the electric wire 211 are omitted from the cross-sectional illustrations and detailed internal structures, and only the external shape is shown.

The fuse resistor 220 is, for example, cylindrical. The 1 st end of the fuse resistor 220 is connected to the electric wire 211, and is electrically connected to the power source P1 (see fig. 4) via the electric wire 211 (see fig. 3) and the base 5 (see fig. 2). The 2 nd end of the fuse resistor 220 is connected to the electric wire 211, and is electrically connected to the rectifier 200 (see fig. 4) of the lighting circuit 20 via the electric wire 211. The fuse resistor 220 has a fuse portion between the 1 st and 2 nd terminals. When the current passing through the fuse resistor 220 continuously exceeds the rated current (allowable current), the temperature of the fused portion increases due to the joule heat generated by the fuse resistor 220, and the fuse resistor 220 fuses. The fuse resistor 220 is not limited to a cylindrical shape, and may be, for example, a square column shape.

The insulation member 221 covers the fuse resistor 220. More specifically, the insulating member 221 covers the entire outer peripheral surface of the fuse resistor 220. The insulating member 221 electrically insulates the fuse resistor 220 from the electric wire 212, the base 5, and the lighting circuit 20. Further, the insulating member 221 reduces heat conduction from the fuse resistor 220 to the fixing member 222. Here, the term "the insulating member 221 reduces the heat conduction from the fuse resistor 220 to the fixing member 222" means that the heat conduction from the fuse resistor 220 to the fixing member 222 is lower than in the case where the fixing member 222 directly covers the fuse resistor 220. Further, the insulating member 221 has heat resistance at least with respect to the fusing temperature of the fusing resistor 220.

The insulating member 221 is, for example, hollow cylindrical. The insulating member 221 is, for example, a glass fiber woven tube. The glass fiber woven tube is formed by weaving glass fibers made of silica into a hollow cylindrical shape, for example.

The fixing member 222 is a member for covering and fixing the insulating member 221 so that the insulating member 221 covers the outer peripheral surface of the fuse resistor 220. The fixing member 222 integrally covers the fuse resistor 220 and the insulating member 221. Here, the fixing member 222 is not in direct contact with the fuse resistor 220. That is, the insulating member 221 is located between the fixing member 222 and the fuse resistor 220. More specifically, the insulating member 221 is located at least between the outer peripheral surface of the fuse resistor 220 and the fixing member 222. In addition, in the case where a gap exists between the fixing member 222 and the fuse resistor 220, the insulating member 221 may not necessarily be located in the space.

As shown in fig. 5, the fixing member 222 according to embodiment 1 is fixed to the electric wire 211 connected to the 1 st end of the fuse resistor 220 and the electric wire 211 connected to the 2 nd end of the fuse resistor 220. Thereby, the insulating member 221 is fixed in the space between the fuse resistor 220 and the fixing member 222. Thus, the insulating member 221 can be prevented from falling off from the outer peripheral surface of the fuse resistor 220. The fixing member 222 may be configured not to directly contact the fuse resistor 220, and may be configured to prevent the insulating member 221 from falling off. For example, the insulating member 221 may cover the 1 st end of the fuse resistor 220, and the fixing member 222 may further cover the 1 st end of the fuse resistor 220 covered by the insulating member 221.

The fixing member 222 is, for example, a heat shrink tube.

(4) Effects of

In the lighting device 1 according to embodiment 1, in the fuse portion 22, the insulating member 221 is located between the fuse resistor 220 and the fixing member 222. The insulating member 221 reduces heat conduction from the fuse resistor 220 to the fixing member 222. Therefore, when the current passing through the fuse resistor 220 continuously exceeds the rated current (allowable current), joule heat generated by the fuse resistor 220 is less likely to be conducted to the insulating member 221 and the fixing member 222, and as a result, the temperature of the fuse resistor 220 is likely to rise. In this way, when an abnormally large current flows through the fuse resistor 220, such as when the lighting circuit 20 is abnormal, the fuse resistor 220 is quickly fused, and thus the time for which a large current flows through the lighting circuit 20 can be shortened.

In the lighting device 1 according to embodiment 1, even when the fuse resistor 220 is difficult to fuse, the fuse resistor 220 is easily and rapidly fused when an abnormally large current flows through the fuse resistor 220, for example, when the lighting circuit 20 is abnormal. The condition that the fuse resistor 220 is hard to fuse is, for example, a case where the power supply P1 is a dimmer connected to a commercial power supply and the dimming ratio is set low. In this case, the voltage supplied from the power source P1 is, for example, about 30V, which is lower than 100V, which is the effective voltage of the commercial power source. Therefore, when an abnormality occurs in the lighting circuit 20, the current passing through the fuse resistor 220 may exceed but not be significantly higher than the rated current (allowable current). In this case, in the structure (comparative example) in which the fixing member is in direct contact with the fuse resistor, joule heat generated by the fuse resistor is diffused into the fixing member, and therefore the temperature rise of the fuse resistor is gentle. Therefore, the temperature of the fuse resistor does not rise to the fusing temperature or the time required to rise to the fusing temperature becomes long. In addition, if the fixing member does not have heat resistance to the fusing temperature of the fusing resistor, an abnormality such as melting or burning, smoking, or the like of the fixing member may occur. In contrast, in the lighting device 1 according to embodiment 1, joule heat generated by the fuse resistor 220 is less likely to be conducted to the insulating member 221 and the fixing member 222. Therefore, in the above case, the temperature of the fuse resistor 220 also rapidly increases to the fusing temperature, so that the fuse resistor 220 is rapidly fused, and the time for which the overcurrent flows in the lighting circuit 20 can be shortened.

In the lighting device 1 according to embodiment 1, the fusing part 22 is integrally covered with the fusing resistor 220 and the insulating member 221 by the fixing member 222. Thus, in the fuse 22, the state in which the insulating member 221 is located between the fuse resistor 220 and the fixing member 222 is maintained. In the lighting device 1 according to embodiment 1, the fixing member 222 is a heat shrink tube. Thus, in the lighting device 1 according to embodiment 1, the fuse 22 can be easily assembled.

In the lighting device 1 according to embodiment 1, the insulating member 221 is a glass fiber woven tube. Accordingly, in the fuse 22, the thermal conductivity from the fuse resistor 220 to the fixing member 222 can be reduced by a simple configuration.

(embodiment 2)

In the lighting device 1 according to embodiment 2, the structure of the fuse 22 is different from the lighting device 1 according to embodiment 1 in the following points. In the following description, the same components as those of the lighting device 1 according to embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 6, the fuse 22 according to embodiment 2 includes a fuse resistor 220, an insulating member 221a, and a fixing member 222. In fig. 6, the fuse resistor 220 and the electric wire 211 are omitted from the cross section and the detailed internal structure, and only the external shape is shown, as in fig. 5.

The insulation member 221a covers the fuse resistor 220. More specifically, the insulating member 221a covers the entire outer peripheral surface of the fuse resistor 220. The insulation member 221a electrically insulates the fuse resistor 220 from the base 5 and the lighting circuit 20.

Further, the insulation member 221a covers the fuse resistor 220 so as to be spaced apart from the gap Sp1. Here, the term "the insulating member 221a covers the fuse resistor 220 so as to be spaced apart from the gap Sp 1" means that the inner peripheral surface of the insulating member 221a and the outer peripheral surface of the fuse resistor 220 are not in a state of being closely contacted with each other without a gap, but that the gap Sp1 exists between the insulating member 221a and the fuse resistor 220. Further, a part of the inner peripheral surface of the insulating member 221a may be in contact with a part of the outer peripheral surface of the fuse resistor 220. The insulating member 221a and the gap Sp1 reduce heat conduction from the fuse resistor 220 to the fixing member 222.

The insulating member 221a is, for example, a glass fiber woven tube formed by weaving glass fibers into a cylindrical shape.

The fixing member 222 is a member for covering and fixing the insulating member 221a so that the insulating member 221a covers the outer peripheral surface of the fuse resistor 220. The fixing member 222 integrally covers the fuse resistor 220 and the insulating member 221 a. Here, the insulating member 221a or the gap Sp1 is located between the fixing member 222 and the fuse resistor 220.

In the lighting device 1 according to embodiment 2, in the fuse 22, the insulating member 221a and the gap Sp1 are located between the fuse resistor 220 and the fixing member 222. The insulating member 221a and the gap Sp1 reduce heat conduction from the fuse resistor 220 to the fixing member 222. Therefore, when the current passing through the fuse resistor 220 continuously exceeds the rated current (allowable current), joule heat generated by the fuse resistor 220 is less likely to be conducted to the insulating member 221a and the fixing member 222, and as a result, the temperature of the fuse resistor 220 is likely to rise. In this way, when an abnormally large current flows through the fuse resistor 220, such as when the lighting circuit 20 is abnormal, the fuse resistor 220 is quickly fused, so that the time for which a large current flows through the lighting circuit 20 can be shortened.

In the lighting device 1 according to embodiment 2, the insulation member 221a and the gap Sp1 reduce heat conduction from the fuse resistor 220 to the fixing member 222. Therefore, for example, when the gap Sp1 sufficiently reduces the heat conduction from the fuse resistor 220 to the insulating member 221a, the heat conductivity of the insulating member 221a does not necessarily need to be lower than the heat conductivity of the fixing member 222. Therefore, even a material having a higher thermal conductivity than the fixing member 222 may be used as the material of the insulating member 221 a. Further, due to the presence of the gap Sp1, even when the fusing resistance 220 reaches the fusing temperature but the temperature of the insulating member 221a does not reach the fusing temperature of the fusing resistance 220, the heat-resistant upper limit temperature of the insulating member 221a may be made lower than the fusing temperature of the fusing resistance 220. Thus, the insulating member 221a may be a resin tube such as a silicon tube made of silicone rubber.

(summary)

The lighting device (1) according to claim 1 includes a light source (12), a lighting circuit (20), a fuse resistor (220), a glass fiber woven tube (221), and a fixing member (222). The lighting circuit (20) has an input-side circuit (21) for supplying power from the outside, and lights the light source (12). The fuse resistor (220) is provided in the circuit (21) of the lighting circuit (20). A glass fiber braided tube (221) covers the fuse resistor (220). The fixing member (222) covers the glass fiber woven tube (221) and fixes the glass fiber woven tube (221) to the circuit (21).

According to the lighting device (1) of the above aspect, the glass fiber braided tube (221) blocks heat conduction from the fuse resistor (220) to the fixing member (222). Therefore, when overcurrent flows through the fuse resistor (220), the temperature of the fuse resistor (220) rises rapidly, so that the fuse resistor (220) fuses rapidly, and the time for which the overcurrent flows through the lighting circuit (20) can be shortened.

The lighting device (1) according to claim 2 includes a light source (12), a lighting circuit (20), a fuse resistor (220), an insulating member (221 a), and a fixing member (222). The lighting circuit (20) has an input-side circuit (21) for supplying power from the outside, and lights the light source (12). The fuse resistor (220) is provided in the circuit (21) of the lighting circuit (20). The insulating member (221 a) covers the fuse resistor (220) with a gap (Sp 1) therebetween. The fixing member (222) covers the insulating member (221 a) and fixes the insulating member (221) to the circuit (21).

According to the lighting device (1) of the above embodiment, the insulation member (221 a) and the gap (Sp 1) between the insulation member (221 a) and the fuse resistor (220) block heat conduction from the fuse resistor (220) to the fixing member (222). Therefore, when overcurrent flows through the fuse resistor (220), the temperature of the fuse resistor (220) rises rapidly, so that the fuse resistor (220) fuses rapidly, and the time for which the overcurrent flows through the lighting circuit (20) can be shortened.

In the lighting device (1) according to claim 3, in claim 2, the insulating member (221 a) is a glass fiber woven tube.

According to the lighting device (1) of the above embodiment, the thermal conductivity of the glass fiber woven tube as the insulating member (221 a) is low, so the thermal conductivity from the fuse resistor (220) to the fixing member (222) is reduced. Therefore, when overcurrent flows through the fuse resistor (220), the temperature of the fuse resistor (220) rises quickly, and the fuse resistor (220) blows quickly, so that the time for which overcurrent flows through the lighting circuit (20) can be shortened.

In the lighting device (1) according to claim 4, in claim 2 or claim 3, the fixing member (222) integrally covers the insulation member (221 a) and the fuse resistor (220).

According to the lighting device (1) of the above embodiment, the insulating member (221 a) can be easily prevented from falling off the fuse resistor (220), and the fuse resistor (220) is quickly fused, so that the time for which an overcurrent flows in the lighting circuit (20) can be shortened.

In the lighting device (1) according to claim 5, in claim 1, the fixing member (222) integrally covers the glass fiber woven tube (221) and the fuse resistor (220).

According to the lighting device (1) of the above embodiment, the glass fiber woven tube (221) can be easily prevented from falling off the fuse resistor (220), and the fuse resistor (220) is quickly fused, so that the time for which the overcurrent flows in the lighting circuit (20) can be shortened.

In the lighting device (1) according to claim 6, in any one of claims 1 to 5, the fixing member (222) is a heat-shrinkable tube.

According to the lighting device (1) of the above embodiment, the glass fiber braided tube (221) or the insulating member (221 a) can be prevented from falling off the fuse resistor (220) by a simple method.

The lighting device (1) according to claim 7 further includes a base (4) and a base (5) in any one of claims 1 to 6. The base (4) houses the light source (12) and the lighting circuit (20). The lamp cap (5) is arranged at one end (4A) of the base (4).

According to the lighting device (1) of the above aspect, in the lamp-type lighting device (1), when an overcurrent flows through the fuse resistor (220), the fuse resistor (220) is quickly fused, and the time for the overcurrent to flow through the lighting circuit (20) can be shortened.

In the lighting device (1) according to claim 8, in claim 7, the circuit (21) of the lighting circuit (20) electrically connects the base (5) and the lighting circuit (20). The fuse resistor (220) is located between the base (5) and the lighting circuit (20).

According to the lighting device (1) of the above embodiment, the circuit (21) of the lighting circuit (20) can be made to have a simple configuration with a short length.

Claims

1. A lighting device is characterized in that,

the device is provided with:

a light source;

a lighting circuit having an input side circuit for supplying power from outside, for lighting the light source;

a fuse resistor provided in the circuit of the lighting circuit;

a glass fiber braided tube covering the fuse resistor; and

and a fixing member for covering the glass fiber woven tube and fixing the glass fiber woven tube to the circuit.

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

the fixing member integrally covers the glass fiber woven tube and the fuse resistor.

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

the fixing component is a heat shrinkage tube.

4. A lighting device as recited in any one of claims 1-3, wherein,

the device further comprises:

a base for accommodating the light source and the lighting circuit; and

the lamp cap is arranged at one end of the base.

5. A lighting device as recited in claim 4, wherein,

the circuit of the lighting circuit electrically connects the lamp cap and the lighting circuit,

the fuse resistor is located between the lamp cap and the lighting circuit.

6. A lighting device is characterized in that,

the device is provided with:

a light source;

a lighting circuit having an input side circuit for supplying power from outside, for lighting the light source; a fuse resistor provided in the circuit of the lighting circuit;

an insulating member that covers the fuse resistor with a gap therebetween; and

and a fixing member covering the insulating member and fixing the insulating member to the circuit.

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

the insulating member is a glass fiber woven tube.

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

the fixing member integrally covers the insulating member and the fuse resistor.

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

the fixing component is a heat shrinkage tube.

10. The lighting device according to any one of claims 6 to 9, further comprising:

a base for accommodating the light source and the lighting circuit; and

the lamp cap is arranged at one end of the base.

11. A lighting device as recited in claim 10, wherein,

the fuse resistor is located between the lamp cap and the lighting circuit.