JP2869559B2 - Ballast for discharge lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a discharge lamp ballast comprising an I-shaped iron core and an E-shaped iron core. It relates to a ballast for a vehicle.

[Conventional technology]

Conventionally, a ballast for a leakage transformer type discharge lamp comprising an I-shaped core and an E-shaped core equipped with a winding is conventionally provided with two E-shaped cores centered on an I-shaped core equipped with a winding bobbin. The I-shaped iron core is fixed by being sandwiched from both sides and pressed to prevent the I-shaped iron core from coming off.

[Problems to be solved by the invention]

In the above prior art, it is necessary to sufficiently pressurize the I-shaped iron core with the E-shaped iron core, so that when the ballast for a discharge lamp is manufactured, there is a tendency that excessive pressurization is often performed.
In general, the dimensions of the inside of the bobbin of the forming bobbin are, as shown in FIG. 6, taking into consideration the workability of inserting the I-shaped core 2 into the forming bobbin 4, and the gap 10 for at most one core in the stacking direction of the core.
In the case where excessive pressurization is performed as described above, the iron core may be distorted as shown in FIG. There was a fear that it would adversely affect the characteristics of the.

SUMMARY OF THE INVENTION An object of the present invention is to provide a ballast for a discharge lamp in which an I-shaped iron core is fixed without distorting the iron core and prevented from coming off.

[Means for solving the problem]

In order to achieve the above object, a discharge lamp ballast according to the present invention has a leakage gap formed by an E-shaped iron core and an I-shaped iron core, and a protrusion slightly thicker than the leakage air gap dimension. At the same time, at the position corresponding to the protruding portion of the I-shaped iron core, a recess capable of accommodating the protruding portion is provided, and the protruding portion is locked in the recess. Things.

[Action]

Since the protrusion formed integrally with the bobbin by synthetic resin or the like is slightly thicker than the leakage gap formed by the E-shaped iron core and the I-shaped iron core, the I-shaped iron core is formed by two E-shaped iron cores. When pressed from both sides and pressurized, the protruding portion is pressed by the E-shaped core and deformed, and a predetermined gap size is obtained, and at the same time, it enters into and engages with the concave portion provided in the I-shaped core. Is fixed and can be prevented from falling out of the bobbin.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. First
The figure is an explanatory view of an embodiment of the ballast for a discharge lamp according to the present invention,
FIG. 2 is a cross-sectional view of a main part of the above embodiment, FIG. 3 is a cross-sectional view of a main part showing another embodiment, and FIG.
FIG. 5 is a cross-sectional view showing a state in which the shaped iron core is pressed, and FIG. 5 is a side view of the present embodiment. In FIG. 1 showing a cross section of an embodiment of the present invention, two E-shaped iron cores 1 are mounted on both sides of an I-shaped iron core 2 on which a formed bobbin 4 formed of, for example, a synthetic resin and provided with a winding is sandwiched. A leakage gap 3 is formed between the I-shaped iron core 2 and the E-shaped iron core 1 so as to face each other. 2
(See the figure), and a concave portion 6 that can accommodate the projecting portion 5 is provided at a position corresponding to the projecting portion 5 of the I-shaped iron core 2. As shown by arrows in FIG. 1, a force F is applied from both sides of the two E-shaped iron cores 1 to
Is pressed against the I-shaped iron core 2 to tightly fix the iron cores 1 and 2 by the base 7 and the cover 8 as shown in FIG. The projecting portion 5 is pushed into the concave portion 6 and is locked at the same time as being deformed by being pushed by the shaped iron core 1 and obtaining a predetermined leakage gap size g. Therefore, the I-shaped core 2 is fixed to the forming bobbin 4 and does not come off. Note that FIG.
The thin-walled portion shown in FIG. 3 concentrates the force applied from the E-shaped iron core 1 to the protruding portion 5 of the forming bobbin 4 during assembly to the thin-walled portion 9 so that the forming bobbin 4 itself does not deform such as twisting. is there.

In the embodiment shown in FIG. 3, the shape of the projecting portion 5 is different from that of the above-described embodiment, and the projecting portion 5 of the embodiment projects toward the E-shaped iron core 1, whereas the projecting portion shown in FIG. Although the portion 5 'protrudes toward the I-shaped iron core, the operation and effect are the same as those of the above embodiment.

As described above, according to this embodiment, the protrusion 5 or 5 'having a thickness slightly larger than the size of the leak gap is formed in the leak gap 3 formed by the E-shaped core 1 and the I-shaped core 2.
Is provided integrally with the forming bobbin 4 along the laminating direction of the I-shaped iron core 2, and at the same time, a concave portion 6 is provided at a position corresponding to the protruding portion 5 or 5 ′ of the I-shaped iron core 2. In this case, the I-shaped iron core 2 is locked and fixed to the protruding portion 5 or 5 ′, so that the I-shaped iron core 2 is prevented from coming off, and the E-shaped iron core 1 pressurizes the I-shaped iron core 2. Since it can be kept to the minimum necessary,
The I-shaped core is not distorted.

〔The invention's effect〕

As described above, the ballast for a discharge lamp according to the present invention is a ballast for a leakage transformer type discharge lamp comprising an I-shaped iron core and an E-shaped iron core having windings mounted thereon. A projecting portion slightly thicker than the gap size of the leaking portion is formed integrally with the bobbin along the laminating direction of the I-shaped core, and the projecting portion is provided at a position facing the projecting portion of the I-shaped core. By providing the recess for housing, by contacting the E-shaped iron core from both sides of the I-shaped iron core, it is possible to maintain a predetermined leakage gap, and the concave portion of the I-shaped iron core is formed by the protrusion of the molding bobbin. Can be locked to
Even if the E-shaped core is not excessively pressurized, it is possible to prevent the core from coming off, and therefore, the core is not distorted.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of a ballast for a discharge lamp according to the present invention, FIG.
FIG. 3 is a cross-sectional view of an essential part showing another embodiment, FIG. 4 is a cross-sectional view showing a state where an E-shaped iron core is pressed in the above embodiment, FIG. 5 is a side view of the above embodiment, and FIG. FIG. 7 is a longitudinal sectional view of a main part for explaining a dimensional relationship between a forming bobbin and an iron core, and FIG. 7 is a side view showing distortion of the iron core in a conventional example. 1 ... E-shaped core, 2 ... I-shaped core, 3 ... Leakage gap,
4 ... molding bobbin, 5 ... protruding part, 6 ... concave part.

Claims (1)

(57) [Claims] In a ballast for a leakage transformer type discharge lamp comprising an I-shaped iron core and an E-shaped iron core having windings mounted thereon, the leakage gap of the winding bobbin is slightly smaller than the gap dimension of the leakage portion. A thick protrusion is formed integrally with the bobbin along the lamination direction of the I-shaped iron core, and a concave portion for accommodating the protrusion is provided at a position opposite to the protrusion of the I-shaped iron core. Ballast for discharge lamps.