JP2003168318A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for mounting a lighting device, capable of contributing to miniaturization of a luminaire, reduction of its cost, and reduction of its assembling man-hours. <P>SOLUTION: This luminaire is provided with a high-pressure discharge lamp 16 and its lighting device 12. A housing part 13 in which a filler 15 is filled in condition wherein mounting articles for a printed circuit board to compose the lighting device 12 are housed is formed inside a case 11 of the luminaire, and four protrusions 14a, 14b are protruded from the bottom surface as holding parts to hold the mounting articles for the printed circuit board in the housing part 13, when filling the filler 15 in the housing part 13 with the case 11 kept in a horizontal position. The two outside protrusions 14a are formed lower than the two inside protrusions 14b, and thereby the mounting article is held with its position inclined from horizontality. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting fixture including a high pressure discharge lamp and a lighting device therefor, and more particularly to a mounting structure of the lighting device in the lighting fixture.

[0002]

2. Description of the Related Art As a lighting device for lighting a high pressure discharge lamp, there is a device called an electronic ballast using an electronic circuit in addition to a device using a conventional so-called copper-iron ballast. Recently, electronic ballasts, which are excellent in terms of weight reduction, size reduction, and high functionality, have become mainstream.

FIG. 5 is a block diagram of a conventional lighting fixture using an electronic ballast as a lighting device. Lighting device 52
The input side of the lighting device 52 is connected to the commercial AC power supply 51.
A high-pressure discharge lamp (lamp) 53 is connected to the output side of the. The lighting device 52 includes a DC power supply circuit unit 54 and an inverter circuit unit 55. The inverter circuit unit 55 generates a high frequency voltage for driving the lamp 53 from the output voltage of the DC power supply circuit unit 54, and controls the power supplied to the lamp 53.

Some of such luminaires are used as downlights or spotlights as shown in FIG. In the lighting fixture 60 of FIG. 6, the socket 61 of the lamp 53 and the lighting device 52 are housed in the main body case, and these are integrally formed. The lighting device 52 is
It consists of an outer case 62 and a printed circuit board package 63 housed in the outer case.

FIG. 7 is a plan view showing the structure of a lighting apparatus according to another conventional example (for example, Japanese Patent Laid-Open No. 2001-10277).
8). In this lighting fixture 70, the printed circuit board mounted product 71 that constitutes the lighting device 52 is directly fixed inside the lighting device 70, and there is no external case that covers the printed circuit board mounted product 71. By eliminating the outer case, the cost of the lighting fixture 70 can be reduced. Mounting holes are provided at four corners of the printed circuit board mounted product 71, and the printed circuit board mounted product 71, that is, the lighting device 52 is directly screwed into the lighting fixture 70 by using four screws 72.

[0006]

However, the method of directly screwing the printed circuit board mounting product constituting the lighting device into the interior of the luminaire as described above has a drawback in that the assembly is troublesome. Further, it is necessary to form the mounting holes at the four corners of the printed circuit board, which is disadvantageous for downsizing the printed circuit board itself.

The present invention has been made in view of the above conventional problems, and provides a mounting structure of a lighting device which can contribute to downsizing of a lighting fixture, cost reduction, and reduction of assembly man-hours. The purpose is to

[0008]

A luminaire according to the present invention is a luminaire comprising a high pressure discharge lamp and a lighting device for the high pressure discharge lamp, wherein a filling material is provided in a state in which a printed circuit board mounted product constituting the lighting device is accommodated. A housing part to be filled is formed inside a case of the lighting fixture, and when the case is placed in a horizontal position and the filling material is filled in the housing part, the printed circuit board mounted product is tilted from the horizontal position. It is characterized in that it is provided with a holding portion which is held in the accommodating portion.

According to this structure, since the printed circuit board mounted product can be fixed in the case of the lighting fixture by the filling material, it is not necessary to secure the space for the mounting holes at the four corners of the printed circuit board. The size of the substrate can be reduced. Further, the filling and hardening of the filling material can be easily automated, and the number of assembling steps can be reduced as compared with the case of screwing. Furthermore, in the process of curing the filling material, the printed circuit board mounted product is held in a posture inclined from the horizontal posture, so that the filling material is prevented from curing while leaving many bubbles below the printed circuit board mounted product.
The heat generated by the electronic components mounted on the printed circuit board is easily dissipated through the filler.

The holding portion may be three or more protrusions provided on at least three places on the bottom surface of the accommodating portion so that the lower surface of the printed circuit board mounted product is placed. It is preferable that the projections are provided at the four corners of the bottom surface of the accommodating portion so that the four corners of the lower surface are placed, and the projections are integrally formed with a wall surrounding the accommodating portion. This can further contribute to downsizing of the printed circuit board.

In the printed circuit board mounted product,
It is also preferable that the inclined posture of the printed circuit board mounted product is selected so that the side on which the electronic component having a relatively large heat generation is mounted is buried deeper in the filling material than the other side. By doing so, the heat generated by the electronic component, which generates a relatively large amount of heat, can be easily dissipated to the outside of the lighting fixture through the filler and the case.

Further, it is also preferable that a plurality of through holes are provided in the printed circuit board of the printed circuit board mounted product.
By providing the plurality of through-holes, when the filling material is injected, the filling material flows into the lower side of the printed circuit board through these through-holes, so that the filling material can be injected efficiently. In addition, during the process of curing the filler, bubbles existing on the lower side of the printed board easily escape into the air from the upper side of the printed board through the through holes.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mounting structure of a lighting device in a lighting fixture according to an embodiment of the present invention. The luminaire 10 includes a housing 11 in which a housing 13 for a lighting device 12, which is a printed circuit board mounted product, is provided. The accommodating portion 13 has a part of the bottom surface of the case 11
It has a rectangular parallelepiped shape surrounded by two wall surfaces, and its one surface (upper surface)
Is open. Protrusions (corresponding to holding portions) 14 on which the four corners of the lower surface of the printed circuit board mounted product that constitutes the lighting device 12 are placed are provided at the four corners of the bottom surface of the housing portion 13.

In the process of assembling the lighting fixture 10, after the lighting device 12 is housed in the housing part 13 by mounting the four corners of the lower surface of the printed circuit board mounting product constituting the lighting device 12 on the four protrusions 14, for example, A filling material such as silicone resin is poured into the housing portion 13. When the filling material is cured, the lighting device 12 is firmly fixed in the housing portion 13.

As a result, as compared with the case where the lighting device 12 is fixed in the lighting fixture 10 by screwing as shown in the conventional example, it is not necessary to secure the space for the mounting holes at the four corners of the printed circuit board. The size of the substrate can be reduced. Further, the filling and hardening of the filler can be easily automated (mechanized), and the number of assembly steps can be reduced as compared with the case of screwing.

In the illustrated example, four protrusions are provided, one at each of the four corners of the bottom surface of the accommodating portion 13, but a minimum of three protrusions (for example, at the side opposite to both ends of one side). If a protrusion (holding portion) is provided near the center), the lighting device 1
It is possible to hold the printed-circuit-board-mounted product that constitutes No. 2 in a stable state.

FIG. 2 is a side view of the case 11 of the lighting fixture and the housing portion 13 of the lighting device. As can be seen from FIGS. 1 and 2, out of the four protrusions provided at the four corners of the bottom surface of the accommodating portion 13, the outer two protrusions 14a are formed to be lower than the inner two protrusions 14b. ing. As a result, even when the case 11 of the lighting fixture is placed horizontally in the filling step of the filling material, the printed circuit board of the lighting device 12 placed in the housing portion 13 is not in a horizontal state but in an inclined posture.
In FIG. 1, four protrusions are provided so as to be slightly apart from the inner surface of the side wall of the accommodating portion 13, but in FIG. 2, the four protrusions are integrally formed with the wall portion of the accommodating portion 13. Either structure may be used, but by adopting the structure of FIG. 2, it is possible to further contribute to downsizing of the printed board.

FIG. 3 shows a state in which the lighting device 12 is housed in the housing portion 13 and fixed by the filling material 15.
In the case 11 of the lighting fixture, in addition to the lighting device 12 fixed to the housing portion 13, a socket 17 of a lamp (high pressure discharge lamp) 16 is housed, and the lighting device 12 and the socket 17 are electrically connected by an electric cable 18. It is connected to the.

As shown in FIG. 3, since the lighting device 12 is accommodated in the accommodating portion 13 in a slanted posture rather than horizontally, the lighting device 12 (printed circuit board) is placed below the lighting device 12 when the filling material 15 is cured. Bubbles can easily escape. If the filling material 15 is hardened while a large amount of air bubbles remain, heat release from the electronic component (heat generating component) mounted on the printed circuit board is hindered by the air bubbles, which is not preferable. In the present invention, the lighting device 12
Since the printed circuit board is mounted obliquely, it is difficult for bubbles to remain in the filler 15 below the lighting device 12 (printed circuit board), and the heat of the electronic component is easily radiated through the filler. .

Further, as shown in FIG. 3, in a printed circuit board mounted product which constitutes the lighting device 12, a heat generating component 19 such as a transformer or a power transistor which generates a relatively large amount of heat.
It is desirable to set the direction of the lighting device 12 (printed circuit board mounted product) so that the side on which is mounted is the lower side, that is, the filling device 15 is deeper. By doing so, the heat of the heat generating component 19 is easily radiated to the outside of the lighting fixture (case 11) via the filler 15 and the case 11 (13).

FIG. 4 is a plan view of a printed circuit board mounted product which constitutes the lighting device 12. The printed circuit board of the lighting device 12 is appropriately provided with a plurality of through holes 21 within a range that does not affect the wiring pattern. Since the plurality of through holes 21 are provided, when the filling material 15 is injected, the filling material 15 flows into the lower side of the printed circuit board through these through holes 21, so that the filling material 15 is efficiently injected. be able to. In addition, in the curing process of the filler 15,
Bubbles existing on the lower side of the printed board easily escape to the air from the upper side of the printed board through the through holes 21. In this way, it is possible to prevent the filling material 15 from being cured while leaving a large amount of air bubbles under the printed circuit board, and as described above, the heat of the heat generating component 19 is radiated to the outside of the lighting fixture through the filling material 15 and the case 11. It is easy to be done.

The specific structure shown in each drawing is an example, and can be implemented by appropriately changing it. The present invention is not limited to the above embodiment and can be implemented in various forms.

[0023]

As described above, in the lighting equipment of the present invention, when the printed circuit board constituting the lighting device of the high pressure discharge lamp is fixed in the case of the lighting equipment, it is fixed by using the filling material. As a result, automation can reduce the number of assembly steps and downsize the printed circuit board. As a result, downsizing and cost reduction of the entire lighting fixture can be realized. In addition, when the printed circuit board that constitutes the lighting device is placed in the case of the lighting fixture, the printed circuit board is placed in an inclined posture with respect to the case in the horizontal posture and the filling material is injected. Bubbles are less likely to remain on the side, and the heat of the heat generating component is likely to be radiated through the filler.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounting structure of a lighting device in a lighting fixture according to an embodiment of the present invention.

FIG. 2 is a side view of a case of a lighting fixture and a housing of a lighting device.

FIG. 3 is a diagram showing a state in which the lighting device is housed in a housing unit and fixed by a filler.

FIG. 4 is a plan view of a printed circuit board mounted product which constitutes a lighting device.

FIG. 5 is a block diagram of a conventional lighting fixture using an electronic ballast as a lighting device.

FIG. 6 is a view showing a structure of a conventional lighting fixture used as a downlight or a spotlight.

FIG. 7 is a plan view showing a structure of a lighting fixture according to another conventional example.

[Explanation of symbols]

11 cases 12 lighting device 13 accommodation 14 Holding part (projection) 15 Filling material 16 High-pressure discharge lamp 19 Electronic components that generate a relatively large amount of heat 21 through holes

Claims (5)

[Claims] 1. A lighting fixture comprising a high-pressure discharge lamp and a lighting device for the same, wherein a housing portion filled with a filler in a state where a printed circuit board mounted product constituting the lighting device is housed is a case of the lighting device. And a holding part which is formed inside the housing and holds the printed circuit board mounted product in the housing part in a tilted position from the horizontal position when the case is placed in the horizontal position and the filling material is filled in the housing part. Lighting equipment characterized by being. 2. The holding portion is three or more protrusions provided at least at three positions on the bottom surface of the housing portion so that the lower surface of the printed circuit board mounted product is placed. The lighting fixture according to item 1. 3. The holding section is a projection provided at four corners of a bottom surface of the housing section so that four corners of a lower surface of the printed circuit board mounted product are placed, and the projection surrounds the housing section. 3. It is formed integrally with
The described lighting equipment. 4. The inclination posture of the printed circuit board mounted product is selected so that the side on which the electronic component having a relatively large heat generation is mounted is more deeply embedded in the filling material than the other side in the printed circuit board mounted product. Claim 1 characterized in that
The described lighting equipment. 5. The luminaire according to claim 1, wherein a plurality of through holes are provided in a printed circuit board of the printed circuit board mounted product.