JPH0521853Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a ballast for discharge lamps.

(Prior Art) In order to reduce leakage magnetic flux, which is one of the causes of noise generation in this type of ballast, a ballast in which a magnetic plate is disposed on the surface of the ballast body is already known.
As an example, both ends of a magnetic plate are bent to form a standing part, and the coil of the ballast body is held and fixed by the standing part from both sides. (Refer to the publication.)

This configuration is convenient because it makes it easy to fix the magnetic plate, but on the other hand, the magnetic plate must be placed on the surface of the coil, which increases the size of the ballast body and makes it difficult to use. The storage case will also be larger. Furthermore, since it is impossible to reduce the distance between the magnetic plate and the surface of the core structure of the ballast body to less than the height of the coil, there is naturally a limit to the absorption of leakage magnetic flux by the magnetic plate.

(Problem to be solved by the invention) This invention has a magnetic plate that absorbs the leakage magnetic flux of the ballast body and reduces noise, in a state where it is sufficiently close to the iron core structure of the ballast body. The purpose is to securely fix and place it on the coil.

(Means for solving the problem) This idea uses a magnetic plate that absorbs leakage magnetic flux.
Consisting of at least a central portion sandwiched between the primary and secondary coils of the ballast main body, and side pieces extending left and right from both ends of this central portion and abutting each side of each of the coils, the side pieces The magnetic plate is fixed to the coil by contacting the side surface of the coil with the magnetic plate.

(Example) An example of this invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes the ballast main body, which includes an iron core structure 4 formed into a Japanese character shape by a central leg 2 and side legs 3, and a primary coil 5 and a secondary coil wound around the central leg 2. 6, and a leaky iron core 7 which is located between both coils and is sandwiched between the central leg 2 and the side legs 3. These structures are not particularly different from conventional ballasts of this type.

Reference numeral 11 denotes a magnetic plate according to this invention, which is composed of a central portion 12 and side pieces 13 extending left and right from both ends of the central portion 12. 1st
The magnetic plate shown in FIGS. 2 and 2 has an end piece 14 bridging each end of the side piece 13, thereby forming a Japanese character shape, as shown in FIG. Alternatively, the end piece 14 may be omitted to form an H-shape.

The magnetic plate 11 is arranged so that its central part 12 faces the leaky iron core 7 and each side piece part 13 faces the side legs 3, and then it is pushed toward the iron core structure 4. Then, the central part 12 falls between both coils 5 and 6, and the side pieces 13 come into contact with the sides of each coil, sandwiching the coil from both sides.

This allows the magnetic plate 11 to be securely fixed to the coil, and also allows the magnetic plate 11 to be securely fixed to the coil.
reaches a position closer to the core structure 4 than the surface of the coil. As a result of the above, installing the magnetic plate 11 does not involve any increase in the size of the ballast body, and since it is installed sufficiently close to the surface of the core structure 4, leakage magnetic flux can be sufficiently absorbed. It becomes like this.

In particular, the central portion 12 is placed close to the leakage core 7. This is because due to the characteristics of the leaky core 7, the leakage magnetic flux from now on is greater than the leakage magnetic flux from other cores, but since the central part 12 reliably absorbs the leakage magnetic flux from now on, the noise can be suppressed reliably. .

Note that as shown in FIGS. 1 and 2, the end piece 14
When using a magnetic plate 11 having a magnetic plate 11, the end face of the coil may be sandwiched between the end piece portion 14 and the center portion 12, and the magnetic plate 11 may also be fixed to the coil by this.

(Effects of the invention) As detailed above, according to this invention, the magnetic plate for absorbing leakage magnetic flux can be installed closer to the surface of the core structure than the surface of the coil. Even if the ballast is installed, the size of the ballast will not increase in any way, and since it can be installed sufficiently close to the surface of the core structure, leakage magnetic flux can be reliably absorbed, and in particular, leakage magnetic flux from the leakage core can be absorbed. Since the neck becomes easier, the noise caused by this can be reliably reduced.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an embodiment of this invention, Figure 2 is a sectional view showing an embodiment of this invention.
The figure is an exploded perspective view, and FIG. 3 is a plan view showing another example of the magnetic plate. 1... Stabilizer body, 4... Iron core structure, 5, 6...
...Primary and secondary coils, 7...Leaky core, 11
...Magnetic plate, 12... Central part, 13... Side piece part.

Claims (1)

[Scope of utility model registration request] For a discharge lamp equipped with a ballast body consisting of a Japanese character-shaped core structure, primary and secondary coils wrapped around the core structure, and a leaky core located between the primary and secondary coils. In the ballast, as a magnetic plate that absorbs leakage magnetic flux from the ballast main body,
A central portion facing the surface of the leaky core and sandwiched between the primary and secondary coils of the ballast body, and a central portion extending left and right from both ends of the central portion to each side of the primary and secondary coils. for a discharge lamp, the magnetic plate is fixed to the primary and secondary coils by the side pieces sandwiching the side surfaces of the primary and secondary coils. stabilizer.