JPH08124420A - Luminaire - Google Patents

Abstract

PURPOSE: To prevent temperature rising of structural components in the periphery of a filament in the final stage of the life of a filament by arranging a thermal protector on the facing side to the filament of a lamp. CONSTITUTION: A luminaire has a thermal protector 3 arranged in a position facing to a filament 2 of a lamp 1. The thermal protector 3 detects abnormal temperature rising of the filament 2 of the lamp 1 and shuts off current to the lamp 1, and is arranged in the upper part of the filament 2 of a fluorescent lamp. In the attaching position of the protector 3 to a luminaire main body 4, a cut-off part 14 is formed in a cover 5 in the position facing to both filaments 2 of the lamp 1 mounted in the normal state on a lamp socket 10, and the protector 3 is exposed from the cut-off part 14. Directions of the protector 3 and the filament 2 of the lamp 1 mounted on the socket 10 are set so that a temperature sensing surface 15 of the protector 3 becomes parallel to the lengthy direction of the filament 2 correctly mounted on the socket 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture having a thermal protector.

[0002]

2. Description of the Related Art There has been a lighting device in which a thermal protector is provided in a ballast to detect an increase in temperature when a lighting circuit is abnormal and to protect lighting parts.

[0003]

However, in this luminaire, since the filament becomes extremely hot at the end of the lamp life, the resin heats up when the lamp and structural parts around the lamp, especially the resin parts such as the cover, are brought close to each other. There was a problem such as deformation. Therefore, an object of the present invention is to provide a luminaire capable of preventing the structural parts around the filament at the end of the lamp life from becoming hot.

[0004]

The luminaire according to claim 1 comprises:
A thermal protector that detects an abnormal temperature rise in the filament of the lamp and shuts off the current of the lamp is arranged at a position facing the filament of the lamp. According to a second aspect of the present invention, in the first aspect, the thermal protector is provided on a ballast.

According to a third aspect of the present invention, in the luminaire according to the first or second aspect, the temperature sensing surface of the thermal protector faces in parallel to the longitudinal direction of the filament.

[0006]

According to the luminaire of claim 1, since the thermal protector is arranged so as to face the filament of the lamp,
If the filament becomes abnormally hotter than usual at the end of the lamp's life, the thermal protector will operate and shut off the power, so the temperature around the filament will not rise and the resin parts can be prevented from deforming. . Further, even if the distance between the lamp and the components provided around the lamp is further reduced, the position of the thermal protector can be moved closer to the filament by that amount, so that the peripheral components can be protected from heat and the overall fixture can be made thinner.

According to the lighting equipment of claim 2, in claim 1, since the thermal protector is provided in the ballast, it has the same effect as in claim 1. According to the lighting fixture of claim 3, in addition to the effect of claim 1 or claim 2, since the temperature sensing surface of the thermal protector faces the filament in claim 1 or claim 2,
Since the temperature sensing surface as a whole becomes uniformly hot, the temperature sensing accuracy is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, this luminaire includes a thermal protector 3 at a position where the filament 2 of the lamp 1 faces.
Has been arranged. This thermal protector 3 is a lamp 1
The abnormal temperature rise of the filament 2 is detected, and the current of the lamp 1 is cut off. In the embodiment, it is arranged above the filament 2 of the fluorescent lamp. 3a is a terminal.

A resin cover 5 is attached to the instrument body 4. The instrument body 4 is formed of a substantially flat metal plate. Further, the cover 5 has an elongated box shape having an opening on the upper surface, and a lamp housing recess 6 is formed in approximately half of the outer bottom surface in the width direction so as to surround the side surface and the upper surface of the straight tube lamp 1, The bottom of the lamp housing recess 6 projects toward the opening side. Further, there is a mounting portion 7 whose example is a mounting hole in which the cover 5 and the device body 4 are aligned with each other, and the device body 4 and the cover 5 are simultaneously mounted on the mounting surface 13 by a mounting tool (not shown).

The lighting circuit component 8 is a thermal protector 3
Besides, ballast 10, lamp socket 10, switch 9
Etc., which are arranged inside the cover 5 and attached to the instrument main body 4, respectively, the thermal protector 3, the ballast 1
0 and the switch 12 are provided in the cover 5, but the lamp socket 12 is arranged in the lamp housing recess 6.
In particular, at the mounting position of the thermal protector 3 on the fixture body 4, a notch 14 is formed in the cover 5 so as to face the positions of both filaments 2 of the lamp 1 that are normally mounted in the lamp socket 10, and the thermal cutout 14 serves as a thermal cutout. The protector 3 is exposed. In the embodiment, the temperature sensing surface 15 of the thermal protector 3 is the lamp socket 1
The orientation of the thermal protector 3 and the orientation of the filament 2 when the lamp 1 is attached to the lamp socket 10 are set so as to be parallel to the longitudinal direction of the filament 2 normally attached to 0.

According to this embodiment, since the thermal protector 3 is arranged so as to face the filament 2 of the lamp 1, when the filament 2 becomes abnormally hotter than usual at the end of its life, the thermal protector 3 operates. Since the power source is turned off by this, the temperature around the filament 2 does not become high and the resin cover 5 can be prevented from being deformed. Further, even if the distance between the lamp 1 and the components provided around it is further reduced, the position of the thermal protector 3 can be moved closer to the filament 2 by that amount, so that the peripheral components can be protected from heat, and the overall fixture can be made thinner. .

Since the thermal protector 3 is arranged above, the heat from the filament 2 moves upward, so that the heat can be efficiently transmitted to the thermal protector 3. Further, since the temperature sensing surface 15 of the thermal protector 3 faces the filament 2, the temperature sensing surface 15 as a whole has a uniform high temperature, so that the temperature sensing accuracy is improved. The second embodiment of the present invention is shown in FIG. That is, in this lighting apparatus, the thermal protector 3 in the first embodiment is provided not on both sides but only on one side of the filament 2 of the straight tube type lamp 1.

According to this embodiment, since the temperature of the lamp 1 in the one-sided emilys state is lower than that in the both-sided emilys state, there is a margin against the resin deformation due to the temperature rise, and the proper distance between the lamp 1 and the parts. In addition, the same effect as in the first embodiment can be obtained with only one side, even if the thermal protector 3 is not provided on both sides depending on the temperature sensed by the thermal protector 3.

A third embodiment of the present invention is shown in FIGS.
Shown in That is, in this luminaire, the thermal protector 3 provided in the ballast 22 faces the filament 2 of the lamp 1. The ballast 22 uses an inverter block of an electronic ballast as an example. The instrument main body 20 of the embodiment is bent in an inverted U-shape in cross section, and a lamp holder 21 is attached to both ends of the fixture body 20 through attachment holes 23, and a fixture (not shown) is provided.
And the electronic ballast 22 is fixed to the end of the instrument body 20. 24 is a power line hole. A shade 26 having a U-shaped cross section and a fitting groove 25 formed on both sides is fitted to both sides of the instrument body 20, and both ends have left and right side covers 2
The shade 26 is fixed to the instrument body 20 by 7.
The electronic ballast 22 has a built-in thermal protector 3 as protection against temperature rise when the device is abnormal. The position of the electronic ballast 22 is such that the thermal protector 3 is directly above the filament 2. Is set to. A terminal block 28 is installed on the other side of the electronic ballast 22.

According to this embodiment, when the lamp 1 is at the end of its life, the temperature of the electronic ballast 22 itself rises.
The filament 2 of the lamp 1 also generates heat. The thermal protector 3 is overheated by the heat of the electronic ballast 22 and the heat received from the filament 2, and the current can be cut off early to prevent the appliance from overheating. Therefore, the overheating due to the abnormal temperature of the filament 2 at the end of the lamp life is prevented, and the temperature rise of the filament 2 is related to the reaction of the thermal protector 3. Therefore, the lamp 1 and the parts can be brought as close as possible to each other. It is possible to protect the components in the block of the container 22, and protect the surrounding structural components against the abnormal temperature rise of the filament at the end of the lamp life, which is similar to the effect of the first embodiment. The safety of the equipment can be improved, and the abnormality of the equipment such as fire and deformation can be prevented.

[0016]

According to the luminaire of the first aspect, since the thermal protector is arranged so as to face the filament of the lamp, the thermal protector operates when the filament becomes abnormally hotter than usual at the end of its life. By turning off the power source, the temperature around the filament does not become high and the resin component can be prevented from being deformed. Further, even if the distance between the lamp and the parts provided around it is further reduced, the position of the thermal protector can be moved closer to the filament by that amount, so that the peripheral parts can be protected from heat and the effect of being able to reduce the thickness of the entire fixture is achieved. is there.

According to the lighting equipment of claim 2, in claim 1, since the thermal protector is provided in the ballast, it has the same effect as in claim 1. According to the lighting device of claim 3, in addition to the effect of claim 1 or claim 2, the temperature sensing surface of the thermal protector faces the filament in claim 1 or claim 2.
Since the temperature sensing surface as a whole becomes uniformly hot, the temperature sensing accuracy is improved.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a first embodiment of the present invention.

FIG. 2 is a sectional view.

FIG. 3 is a bottom view thereof.

FIG. 4 is a bottom view of the second embodiment.

FIG. 5 is an exploded perspective view of a third embodiment.

FIG. 6 is a bottom view of the assembled state.

[Explanation of symbols]

 1 lamp 2 filament 3 thermal protector

Claims (3)

[Claims] 1. A luminaire, wherein a thermal protector for detecting an abnormal temperature rise of a filament of a lamp and shutting off a current of the lamp is arranged at a position facing the filament of the lamp. 2. The luminaire according to claim 1, wherein the thermal protector is provided on a ballast. 3. The luminaire according to claim 1, wherein a temperature sensing surface of the thermal protector faces in parallel with a longitudinal direction of the filament.