JPS6284506A - Ballast of electric-discharge lamp - Google Patents

Abstract

PURPOSE:To obtain a ballast of an electric-discharge lamp which generates little noise and has a stable electric characteristic, by providing a projecting yoke-holding element in the end portion of the bobbin of a coil so that a silicon steel plate located on the lowermost side of a yoke is prevented from getting on a core. CONSTITUTION:The ballast of an electric-discharge lamp is so constructed that the lowermost side of a yoke 4 is held up by a yoke-holding element 8 provided in the end portion of a coil bobbin 7 put on a core 3, at the joining surfaces of the yoke 4 and the core 3 being opposite to each other. Therefore a silicon steel plate located on the lowermost side of the yoke 4 is prevented from getting on the back of the core 3 even when a pressure A is applied from the lateral side in assembling. The yoke-holding element 8 is so formed that it projects in a little inclination toward the outer periphery of a coil, outside a flange which is positioned outside when the bobbin 7 is fitted on the core 3. The height h2 from the lower end of the flange to the upper end of the yoke- holding element 8 is made to be larger by about 0.5 mm than the height H of the flange of the bobbin 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a discharge lamp ballast whose core and yoke can be assembled correctly.

[Background of the invention]

In a discharge lamp ballast, especially a leakage transformer type discharge lamp ballast, as shown in FIG. It is assembled by tightening the cover 6 so as to wrap it from above and below. During this assembly, in order to align the facing surfaces of the core 3 and the yoke 4, as shown in FIG. Generally speaking, they are arranged so that they are aligned evenly.However, in order to assemble the above discharge lamp ballast, when tightening the base 5 and cover 6, the yoke 4 is provided on the base 5 as shown in FIG. In an unstable state with about half of the car on the stepped section,
Since the side clamping type 01 is suppressed from the side force in the A direction, and the upper clamping type 02 is pressed from the B direction, the steel plate on the lowermost surface of the yoke 4 is easily moved, and its tip is As shown in FIG.
There was a drawback that the yoke vibrated and the noise became louder.

[Purpose of the invention]

An object of the present invention is to provide a discharge lamp ballast that prevents the steel plate on the lowermost surface of the yoke from colliding with the core and has stable electrical characteristics with little noise.

[General outline of the invention]

The present invention provides a discharge lamp ballast in which a yoke is arranged on both sides of a core to which a coil is attached, and a yoke holding portion is provided protruding from the bobbin end of the coil, so that the ff [steel plate is attached to the core] on the lowermost surface of the yoke. This is to prevent it from being run over.

[Embodiments of the invention]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial view showing an embodiment of the discharge lamp ballast according to the present invention, FIG. 2 is a front view of the bobbin of the above embodiment, FIG. 3 is a side view showing the end of the bobbin, and FIG. It is a front view which shows the wall part of the bobbin which shows another Example of this invention. As shown in FIG. 1, the discharge lamp ballast according to the present invention has a coil bobbin 7 attached to the core 3 at the opposing joint surfaces of the yoke 4 and the core 3.
The lowermost surface of the yoke 4 is lifted by the yoke holding part 8 provided at the end of the yoke 4, and the height of the lower end surface of the yoke 4 becomes approximately 0.5 mm higher than the height H of the lower end surface of the core 3. Because of the busy setting, the silicon steel plate on the lowermost surface of the yoke 4 does not ride on the back surface of the core 3 even if pressure A is applied from the side during assembly. The thickness of the 40-string yoke steel plate is approximately 0.5 mm.

As shown in FIGS. 2 and 3, the bobbin 7KWi-sparred yoke holding portion 8 is slightly inclined toward the outer periphery of the coil, as shown in the outside of the outer brim when the bobbin 7 is attached to the core 3. The yoke holding part 8 is formed to protrude, and the height from the lower end of the collar to the upper end of the yoke holding part 8 is approximately 0.5 higher than the height H of the collar of the bobbin 7. The protruding height of the yoke holding portion 8 from the boxwood end face should be such that the edge of the yoke 4 can be sufficiently locked when the yoke 4 is combined with the core 3 facing each other. This is a partial view showing another shape of the holding part 8, from the lower end of the boxwood of the bobbin to the tip of the yoke holding part.
It is sufficient that it is approximately 0.5 inch higher than the height HK of the IIJ hanging bar and lowered from the core side toward the yoke side.

By providing the above-mentioned yoke holding part 8 on the edge of the bobbin 7, the lowermost edge of the yoke 4 is attached to the yoke holding part 8 during assembly.
The protrusion of! The lowermost silicon steel plate of the yoke 4 can be prevented from moving upward onto the core 3.

〔Effect of the invention〕

As described above, the discharge lamp ballast according to the present invention has a yoke on both sides of a core to which a coil is attached, and a yoke holding portion is provided protrudingly from the bobbin end of the coil. As assembly work can be done by locking the edge of the yoke to the yoke holding part, it is possible to prevent the silicon steel plate on the bottom surface of the yoke from riding on the core, resulting in very little variation in electrical performance and low noise. A small discharge ballast can be obtained.

[Brief explanation of drawings]

FIG. 1 is a partial view showing an embodiment of the discharge lamp ballast according to the present invention, FIG. 2 is a front view of the bobbin of the above embodiment, FIG. 3 is a side view showing the end of the bobbin, and FIG. FIG. 5 is a plan view of a discharge lamp ballast, FIG. 6 is a partial side view of a conventional discharge lamp ballast, and FIG. 7 is a front view of main parts of a bobbin showing another embodiment of the present invention. 0 1, 2-°゛ Coil 3...Core, 4...Yoke,
7...Bobbin, 8...Yoke holding part Figure 5 Procedure amendment (method) Indication of the case 1985 Patent Application No. 114093 Title of the invention Relationship to the case of person who corrects a discharge lamp ballast Patent application Man

Claims (1)

[Claims] 1. A discharge lamp ballast comprising a yoke arranged on both sides of a core to which a coil is attached, characterized in that a yoke holding portion is provided protruding from the bobbin end of the coil.