JP3133799B2 - Ballast for discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballast for a discharge lamp, and more particularly to an improvement in electrical insulation.

[0002]

2. Description of the Related Art Conventionally, a ballast for a discharge lamp has been used for stably lighting a discharge lamp or the like, and the ballast for a discharge lamp includes a transformer and a capacitor. The transformer, the capacitor and the like are sealed in a discharge lamp ballast case. By the way, when a transformer or the like is sealed in a ballast case for a discharge lamp, a liquid resin is poured and the liquid resin is cured to fix an internal transformer or a capacitor and improve watertightness. Was being planned.

[0003]

Here, in order to maintain the strength, the mounting base for the capacitor or the like has conventionally been made of a material which is not eroded by the filler such as the resin. However, if the adhesion between the filler and the mounting base such as a capacitor is not good, a gap is created between the mounting base and the cured filler after the filler is cured, and the water tightness is deteriorated and the electrical insulation is poor. In some cases. On the other hand, when the material of the mounting table or the like is made of a material that adheres to the filler, there is a disadvantage that the mounting table or the like is eroded by the filler and the strength is reduced.

An object of the present invention is to provide a ballast for a discharge lamp capable of obtaining a high degree of watertightness and strength.

[0005]

In order to achieve the above-mentioned object, a ballast for a discharge lamp according to the present invention is provided .
A transformer having a bobbin formed at a position where a first terminal portion electrically coupled to the winding is exposed from an iron core; and a transformer that can be fixedly supported on the bobbin, and fixedly supported on the bobbin. When electrically connected to the first terminal portion formed on the bobbin , a terminal block having a second terminal portion supplied with power from external wiring held at a predetermined position, supported by the terminal block, A capacitor base on which a capacitor is mounted, and the transformer-terminal block-capacitor base connected body,
A transformer is located at the bottom and stored, and polyester resin is
A discharge lamp ballast case filled with a filler as a main component , wherein the terminal block is made of a material that is not eroded by the filler, and the capacitor base is made of a material that is eroded by the filler. And In addition, the present invention
And the terminal block is made of polybutylene terephthalate resin.
Or a material mainly composed of phenolic resin,
Capacitor stand is acrylonitrile butadiene styrene
It is preferable to use a material containing fat as a main component.

[0006]

In the ballast for a discharge lamp according to the present invention, as described above, the external wiring is connected to the terminal block, and the terminal block and the bobbin are joined to supply power to the bobbin winding through both terminal portions. Is done. Therefore, the electrical connection is substantially concentrated on the terminal block. On the other hand, in the present invention, since the terminal block is not eroded by the filler, the mechanical strength of the terminal block is sufficiently high.
In addition, since the capacitor base is eroded by the filler, there is no separation between the filler and the capacitor base even when the filler is hardened, and the watertightness of the terminal block sandwiched between the transformer and the capacitor base Is well maintained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a ballast for a discharge lamp according to one embodiment of the present invention. In FIG. 1, the ballast 10 for a discharge lamp includes a transformer 12, a terminal block 14, and a capacitor table 17 on which a capacitor 16 is mounted. The ballast 10 is mounted on a bobbin 18 disposed in an iron core 13 of the transformer 12.
4 is fixed, and the capacitor 16 is fixed to the terminal block 14. Then, the connected body of the transformer 12, the terminal block 14, and the capacitor 16 is inserted into the case 20 and fixed by the compound (filling material) 21. A characteristic of the present invention is that the capacitor table 17 is
And the terminal block 14 is made of a material which is not eroded by the compound.

Here, the filler 21 is composed of about 200 to 250 fillers such as silica sand, calcium carbonate, talc and the like and about 1 curing agent with respect to the unsaturated polyester resin 100. On the other hand, the terminal block 14 is
For example, a PBT resin (polybutylene terephthalate resin), a phenol resin, or the like is used.

On the other hand, the capacitor base 17 is made of a resin which is eroded by the filler 21 and is made of, for example, ABS resin.
(Acrylonitrile butadiene styrene resin) or the like is employed, so that the peeling phenomenon does not occur between the capacitor base 17 and the cured filler 21. Further, since the filler has good adhesion to metal, water tightness is ensured even in the transformer 12 by the iron core 13 and the case 20. For this reason, although the terminal block 14 has many electrical joints, it does not cause connection failure due to erosion or breakage due to reduced mechanical strength. Therefore, despite the fact that a gap is sometimes formed between the terminal block 14 and the hardening filler, the terminal block 14 is sandwiched between the capacitor block 14 and the transformer 12 so as to be removed.
The watertightness of the part is well maintained.

As described above, according to the ballast for a discharge lamp according to the present embodiment, it is possible to simultaneously satisfy both the electrical characteristics and the mechanical strength. In this embodiment, the terminal block 1
4 is configured as shown in FIG. That is, FIG.
(A) is a top view of the terminal block 14, FIG. (B) is a front view from the same direction as FIG. 1, (C) is a side view, (D) is a rear view (bobbin mounting side), and (E) is It is a rear view. In FIG. 1, the terminal block 14 has a square frame 22, a terminal mounting portion 24 disposed on the front side in the figure, and legs 26a, 26b,. The terminal mounting portion 24 is provided with insertion holes 28a, 28b,... 28e, and a male contact (second terminal portion) provided at the end of the external wiring is inserted and fixed in each insertion hole 28. Therefore, when the external wiring is attached, the tip of the male contact projects from the lower part of the insertion hole 28.

The legs 26 each have a U-shaped tip and constitute an engaging portion with the bobbin 18. FIG. 3 shows a state in which the external wiring 30 and the capacitor 16 are attached to the terminal block 14, and FIG.
(B) is a side view, and (C) is a bottom view. In the figure, a capacitor table 17 on which a capacitor 16 is mounted is supported and fixed on a terminal block 14. The external wiring 30 is 4
The books are adhered in a row, and the external wirings 30a, 30b have bifurcated male contacts 32a, 32b at their ends, respectively.
The external wirings 30c and 30d are joined to one male contact 32c. The male contacts 32a, 32b, 32c are inserted into the insertion holes 28a, 28, respectively.
b, it is inserted into 28c, the through hole 28d male contacts 3 2 d alone is inserted and fixed.

A current fuse 3 is connected to the male contact 32d.
4 and the thermal fuse 36 are connected in series, and the other end of the thermal fuse 36 is connected to the male contact 32a. The male contact 32a is connected to one end of the capacitor 16, and the male contact 32c is connected to the other end of the capacitor 16. On the other hand, bobbin 18
It is configured as shown in FIG. That is, FIG. 4A is a top view, FIG. 4B is a front view from the same direction as FIG. 1, and FIG. 4C is a side view. As is clear from the figure, a winding 40 is wound around the bobbin 18 to form a coil. The ends of the windings 40 are connected to female contacts 42a and 42b (first terminal portions) provided at the upper front part in FIG. The terminal block 1 is located at the four upper corners of the collar of the bobbin 18.
, Fitting portions 44a, 44b,.
44d is provided, and the fitting portion 44 is formed in a wedge-like shape having a pointed upper part in the figure.

For this reason, the terminal block 14 is positioned on the bobbin 18 and pushed down, so that the leg 2
6a to 26d are the corresponding fitting portions 44a to 4 of the bobbin 18.
Spreads along the 4d wedge shape, and legs 26a to 26d
Is firmly positioned and fixed in a state where the U-shaped end portion of the U-shape goes over the fitting portions 44a to 44d. In this case, the male contacts 32b and 32d projecting below the terminal block 14 are provided.
Of the female contacts 42a, 42b of the bobbin 18
And an electrical connection between them is obtained. On the other hand, current fuse 34 as described above, the position the thermal fuse 36 is disposed in the space between the bobbin 18 which is formed by the legs 26, current fuses 34 spaced from the bobbin 18 (coil), and the temperature fuse Reference numeral 36 is arranged at a position where it contacts the winding 40.

[0014] Thus, current fuse 34 can be carried out to monitor the current without greatly influenced by the heat generated from the windings 40, and the temperature fuse 36 is to monitor good responsiveness to temperature of the winding 40 Can be. As described above, according to the ballast for a discharge lamp according to the present embodiment, since the positioning of each member can be performed accurately, uniform performance can be obtained without variation by an operator, and further, automation of assembly and mechanization Can be achieved. In addition, wiring errors and the like can be prevented by the collection of components, and workability is improved by simplifying the work. Further, the temperature fuse and the current fuse are arranged at fixed positions, so that a reliable operation can be obtained.

It is preferable that the mounting position of the current fuse is separated from the coil surface by 2 cm or more. The normal current fuse is configured to operate when a current flows at least five times the rated current. In addition, since the thermal fuse has only a difference of 5 to 10 ° C from the actual temperature of the coil surface by bringing the thermal fuse into close contact with the coil surface, use a thermal fuse having a coil safe temperature of -5 to 10 ° C. Is preferred.

[0016]

As described above, according to the ballast for a discharge lamp according to the present invention, a transformer, a terminal block and a capacitor block are connected in this order, and the terminal block is mainly composed of polyester resin.
The capacitor base is made of a material that is not eroded by the filler, while the capacitor base is made of a material that is eroded by the filler containing polyester resin as the main component. suppressed and can be Rukoto
Become .

[Brief description of the drawings]

FIG. 1 is an external side view of a ballast for a discharge lamp according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a terminal block used in the ballast for a discharge lamp shown in FIG.

FIG. 3 is an explanatory diagram showing a state where a capacitor, a fuse, and the like are attached to the terminal block shown in FIG. 2;

FIG. 4 is an explanatory view of a bobbin used in the ballast for a discharge lamp shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ballast for discharge lamps 12 Transformer 14 Terminal block 16 Capacitor 17 Capacitor table 18 Bobbin 21 Filler

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-81624 (JP, U) JP-A-59-109120 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01F 30/00-38/42

Claims (2)

(57) [Claims] An electric power supply for the windings, the windings being electrically connected to the windings.
A transformer having a bobbin first terminal portion is formed at a position exposed from the core which is coupled, it is possible to fix the support on the bobbin, wherein formed in the bobbin upon fixedly supported on the bobbin A terminal block electrically coupled to the first terminal section and having a second terminal section supplied with power from external wiring held at a predetermined position; and a capacitor table supported by the terminal block and mounting a capacitor. The transformer-terminal block-capacitor block connected body is housed with a transformer positioned at the bottom and mainly made of polyester resin.
A discharge lamp ballast case filled with a filler material, wherein the terminal block is made of a material that is not eroded by the filler material, and the capacitor base is made of a material that is eroded by the filler material. Ballast for discharge lamps. 2. A ballast for a discharge lamp according to claim 1.
The terminal block is made of polybutylene terephthalate resin or
Is made of a material mainly composed of phenolic resin.
Acrylonitrile butadiene styrene resin
For discharge lamps, characterized by being made of a material mainly composed of
stabilizer.