JPH09298011A - Inverter lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter lighting device enabling packaging efficiency and reliability to be improved. SOLUTION: This device is constructed such that a circuit board 11, on which electric parts 39, 40 such as a condenser as well as a transformer 25 for stepping-up or a choke as a current limit element are packaged, is housed in a case 20 made of metal. In this event, a packaging space 38 is provided under the transformer 25 or the choke on the circuit board 11, and part of the electric parts 39, 40 are packaged in this packaging space 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter lighting device for lighting a discharge lamp at a high frequency.

[0002]

2. Description of the Related Art A conventional inverter lighting device will be described with reference to FIGS.

FIG. 5 is a perspective view showing a lighting fixture and an inverter lighting device accommodated in the lighting fixture. The lighting fixture 5 accommodating the inverter lighting device 10 has a substantially U-shaped cross section with a downward opening. The instrument main body 6 has an elongated shape, and the lamp socket mounting portions 8 are attached to the lower ends of the instrument main body 6, respectively. Lamp sockets 7, 7 to which discharge lamps (not shown) are mounted are mounted on both sides of the inner surfaces of the lamp socket mounting portions 8, 8 so as to face each other. A cover for closing the lower opening of the instrument body 6
(Not shown) is fixed to the instrument body 6 with a mounting screw (not shown).

Inverter lighting device 10 having an elongated shape
Is fixed in the instrument body 6 by a method not shown.

6 and 7 show an inverter lighting device for lighting a discharge lamp at a high frequency. In the circuit of these inverter lighting devices 10, a transformer or a choke is always used for boosting or limiting. It is used as a flow element.

FIG. 6 shows an inverter lighting device 10a using a transformer, in which a metal case 20 is an elongated ship-like metal cover 21 having a downward opening.
The case 20 is composed of an elongated plate-shaped metal bottom plate 22. Inside the case 20, resistors 12, which are electric parts, a transistor 13, a capacitor 14, a transformer 16 and the like are mounted on the circuit board 11 and soldered. It is attached. Between the circuit board 11 and the bottom plate 22 made of metal, an insulating paper 15 made of Lumilar sheet or the like is fixed by a method not shown, and electrical components such as the transistor 13 mounted on the circuit board 11 and metal parts are made of metal. Conduction with the bottom plate 22 is prevented.

FIG. 7 shows an inverter lighting device 10b using a choke, on which a resistor 12, a transistor 13, a capacitor 14 and a choke 17 which are electric parts are mounted on a circuit board 11. , Soldered. Other configurations are the same as those in FIG.

[0008]

As described above, on the circuit board 11 of the conventional inverter lighting device 10, electric components such as the capacitor 14 and the resistor 12 and the transformer 16 as a step-up or current limiting element, or The choke 17 is mounted and soldered. Since the transformer 16 or the choke 17 as the booster or the current limiting element has a large external appearance, it requires a large mounting area. Furthermore, transformer 16 or cho
Since the gap between the board 17 and the circuit board 11 is narrow, electrical parts such as resistors could not be mounted. Further, there has been a problem that the number of electric components mounted on the circuit board increases and the length of the circuit board increases as the performance of the luminaire increases.

In the elongated lighting fixture, the circuit board becomes long, and the amount of warp generated in the longitudinal direction becomes large. When the amount of warp becomes large, there is a problem in reliability of the inverter lighting device such that stress is applied to an electric component and a soldering portion of the electric component to a circuit board.

The present invention has been made in view of the above points, and is an inverter capable of improving mounting efficiency and reliability.
It is an object to provide a lighting device.

[0011]

In order to achieve the above object, the inverter lighting device of the present invention is provided with an electric component such as a capacitor and a transformer or a choke as a booster or a current limiting element. In an inverter lighting device in which a circuit board is housed in a metal case, a mounting space is provided below the transformer or choke on the circuit board, and a part of the electric component is placed in the mounting space. It is characterized by being implemented.

In the above structure, a transformer or a cho
A mounting space is provided between the circuit board and the circuit board, and some of the electric components such as capacitors and transistors to be mounted on the circuit board are placed in this mounting space. It constitutes a lighting device.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. Note that the same components as in the related art will be described with the same reference numerals.

In FIG. 1, a circuit board 11 on which electrical components are mounted is housed in a metal case 20. The metal case 20 is composed of a substantially ship-shaped metal cover 21 having a downward opening, and a metal bottom plate 22 attached to the downward opening of the cover 21. 21 is connected to the bottom plate 22 by a fastening method not shown. Further, the circuit board 11 and the metal bottom plate 22 are insulated from each other by an insulating paper 15 such as a lumir sheet.

Reference numeral 25 is a large transformer mounted on the circuit board 11 used for boosting or as a current limiting element. FIG. 2 is a front view showing a bobbin of the transformer.

The bobbin 26 is made of an insulating material and
A primary coil winding portion 27 around which a primary coil having collar portions 29, 29 at both ends is wound, and a collar portion 2 at each end.
A secondary coil winding part 28 around which a secondary coil having 9, 29 is wound is formed adjacent to each other, and at the center of the primary coil winding part 27 and the secondary coil winding part 28. Is
A laminated core insertion hole 30 having a substantially rectangular cross section is formed. Further, lead pin mounts 31, 31 are formed so as to project outward from below the collar portions 29a, 29a formed at both ends. Lead pins 32, 32 made of a conductive material are formed so as to project downward from the lower surfaces of the lead pin mounts 31, 31.

Support pieces 33, 33 shorter than the lead pins 32, 32 are provided facing each other inside the lead pins 32, 32 embedded in the lower ends of the bobbin 26, respectively. ing.

A method for assembling the transformer will be described.

First, a primary coil and a secondary coil are wound around the primary coil winding portion 27 and the secondary coil winding portion 28 of the bobbin 26, respectively, to form a primary winding 34 and a secondary winding 35.
And are formed. Next, the primary winding 34 and the secondary winding 3
5, a pair of E-shaped laminated iron cores 36, 36 are fitted and inserted into the laminated iron core insertion holes 30, respectively, and finally, wrapped around the outer peripheral surfaces of these E-shaped laminated iron cores 36, 36 with a tape 37. Then, the pair of E-shaped laminated cores 36, 36 are fixed.

A method of mounting the electric components and the transformer on the circuit board will be described.

The capacitor 14, the resistor 12 and the transistor 13 are mounted on the circuit board 11 by soldering. Next, before mounting the transformer 25 on the circuit board 11, an electrical device such as a resistor 39 or a transistor 40 having a height that can be stored in a mounting space 38 formed between the transformer 25 and the circuit board 11 is provided. The components are mounted on the circuit board 11 by soldering. After that, the transformer 25 is mounted on the circuit board 11 by soldering. The circuit board 11 on which the electrical parts and the transformer 25 are mounted is placed on the bottom plate 22 made of metal and the insulating paper 1
Then, the cover 21 is attached to the bottom plate 22.

FIG. 3 shows a chock used for boosting or as a current limiting element mounted on a circuit board by soldering, and FIG. 4 shows a bobbin of the chock.

The bobbin 46 is made of an insulating material and
A coil winding portion 48 is formed around which coils having flanges 47, 47 are formed at both upper and lower ends, and a laminated iron core insertion hole 49 having a substantially rectangular cross section is formed in the vertical direction of the coil winding portion 48. Are formed. Further, lead pins 32, 32 made of a conductive material are formed so as to protrude downward from the lower surface of the flange portion 47 formed below.

The lead pins 32, 32 are embedded in the lower side of the bobbin 26, respectively.
Support piece portions 33, 33 shorter than the pin pins 32, 32 are provided facing each other.

A method of assembling the transformer will be described.

A coil is wound around the coil winding portion 48 of the bobbin 46 to form a winding 50, and a pair of E-shaped laminated cores 51, 51 are formed in the laminated core insertion hole 49 so as to surround the winding 50.
51 are respectively fitted and inserted, and these E-shaped laminated iron cores 51,
A tape 37 is wound around the outer peripheral surface of 51 to fix the pair of E-shaped laminated cores 51, 51.

A method of mounting the electric components and the chuck on the circuit board will be described.

First, the capacitor 14, the resistor 12 and the transistor 13 are mounted on the circuit board 11 by soldering. Next, before mounting the choke 45 on the circuit board 11, for example, a resistor 39 having a height that can be accommodated in a mounting space 52 formed between the choke 45 and the circuit board 11.
After mounting electrical components such as a transistor and a transistor 40 on the circuit board 11, the choke 45 is mounted on the circuit board 11.

The circuit board 11 on which the electric parts and the choke 45 are mounted is housed in the metal bottom plate 22 through the insulating paper 15, and the cover -21 is attached to the bottom plate 22.

To mount the choke 45 and the transformer 25 on the circuit board 11, the support member 33 formed on the choke 45 and the transformer 25 is abutted against the circuit board 11, and the choke 45 and the transformer 25 are mounted. Although the structure in which the mounting space 52 is formed below is described, only the lead pins 32 and 32 are formed so that the mounting space 52 is formed without forming the support member 33 in the choke 45 and the transformer 25. Alternatively, the height of the choke 45 and the transformer 25 may be determined and the lead pins 32, 32 may be soldered to the circuit board 11.

Instead of mounting electrical parts such as resistors and transistors in the mounting spaces 38 and 52 formed below the transformer 25 or the choke 45, the temperature of the transformer 25 or the choke 45 is detected by a circuit. It is also possible to use a temperature sensitive element. That is, in an inverter lighting device in which an electric component such as a capacitor and a circuit board on which a transformer or a choke for boosting or a current limiting element is mounted are housed in a metal case, the transformer or choke is used. A part of the electric component and the transformer or cho
There is provided a mounting space formed so that a temperature sensitive element for detecting the temperature of the battery can be mounted, and a part of the electric component and the temperature sensitive element are arranged in the mounting space and mounted on the circuit board. In the inverter lighting device, the temperature sensing element for detecting the temperature in a circuit is arranged just below the transformer or choke coil, so that the temperature of the transformer or choke coil can be accurately measured with little variation. It can be detected. Further, if the temperature sensitive element is brought into contact with the transformer or choke coil and mounted on the circuit board 11, the temperature of the transformer or choke coil can be detected more accurately.

The operation of the above embodiment will be described.

A mounting space is provided between the transformer or choke and the printed circuit board, and a part of electric parts such as capacitors and transistors to be mounted on the circuit board are arranged in the mounting space. Mounted on the Inver
A lighting device is configured. Therefore, the electric component such as the capacitor can be mounted below the transformer or the choke where the electric component such as the capacitor has not been conventionally mounted, and the mounting efficiency of the electric component can be improved. Therefore, the circuit board can be downsized, and if the fixture body to which the inverter lighting device is attached is elongated, the circuit board can be prevented from being elongated and warpage in the longitudinal direction of the circuit board can be reduced. You can

Even if the electric component mounted in the mounting space is a chip component, the same operation and effect can be obtained.

[0035]

As described above in detail, according to the present invention, in the inverter lighting device, a mounting space in which a part of the electric component can be mounted is provided below the transformer or the choke, and the mounting space is formed. Since a part of the electric component is arranged in the space and mounted on the circuit board, the mounting efficiency of the electric component on the circuit board can be improved. Furthermore, when the instrument main body has an elongated shape, the length of the circuit board in the longitudinal direction can be shortened. Therefore, the warp of the circuit board in the longitudinal direction can be reduced, and the reliability of the inverter lighting device can be ensured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of the configuration of an inverter lighting device mounted with a transformer according to a first embodiment of the present invention.

FIG. 2 is a front view showing the bobbin of the transformer according to the same embodiment.

FIG. 3 is a sectional view showing a part of the configuration of an inverter lighting device having a choke mounted thereon according to the first embodiment of the present invention.

FIG. 4 is a front view showing the bobbin of the choke according to the embodiment.

FIG. 5 is a perspective view showing a general lighting fixture to which an inverter lighting device is attached and an inverter lighting device.

FIG. 6 is a cross-sectional view showing a part of the configuration of an inverter lighting device mounted with a transformer according to a conventional technique.

FIG. 7 is a cross-sectional view showing a part of the structure of an inverter lighting device having a choke according to a conventional technique mounted therein.

[Explanation of symbols]

 11 ... Circuit board, 20 ... Metal case, 25 ... Transformer, 38 ... Mounting space, 39 ... Electrical component (resistor), 40 ... Electrical component (transistor), 45 ... Choke, 52 ... Mounting space.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H05B 41/24 H05B 41/24 A

Claims (1)

[Claims] 1. An inverter lighting device in which an electric component such as a capacitor and a circuit board on which a transformer or a choke as a voltage boosting element or a current limiting element is mounted are housed in a metal case. An inverter lighting device, characterized in that a mounting space is provided below the transformer or the choke on the substrate, and a part of the electric component is mounted in the mounting space.