JPH04361509A - Ballast for discharge lamps - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ballast for an outer iron discharge lamp.

0002

2. Description of the Related Art In a conventional discharge lamp ballast, as shown in FIG. A flange portion 3 is formed on the flange portion 3, and a terminal portion 4 is formed protruding from the outer end surface of the flange portion 3 at both outer ends. A plurality of terminals 5 are provided protruding from this terminal portion 4 .

Reference numerals 6 and 7 denote a primary coil and a secondary coil wound around the outer periphery of each winding frame portion 2 of the coil bobbin 1.

Reference numeral 8 designates a laminated core including a substantially T-shaped central leg laminated core 9 inserted into the winding frame 2 of the coil bobbin 1, and substantially L-shaped side legs disposed on both sides of the coil bobbin 1. It is composed of a laminated iron core 10. Note that 11 is a pass core, which is fitted between the flange portions 3 of both winding frame portions 2 of the coil bobbin 1.

[0005] The ballast main body 13 is formed by combining the coil bobbin 1 around which the coils 6 and 7 are wound, the laminated iron core 8, and the pass iron core 11. This stabilizer main body 13 is
It can be fixed by caulking with the bottom plate and case that cover the sides (
(similar to FIG. 2 of the embodiment of the present invention), and housed in a cylindrical case and filled with an insulating resin compound or the like (same as shown in FIG. 8 of the embodiment of the present invention).

By the way, in order to improve the secondary current waveform output from the secondary coil 7, a slot 12 is formed along the lamination direction in a portion of the central laminated core 9 that is arranged inside the secondary coil 7. There are things to do. This is achieved by locally reducing the magnetic path cross-sectional area of the magnetic flux passing through the secondary coil 7 using the slot 12, causing local magnetic saturation, and adjusting the amount of magnetic flux output from the secondary coil 7. The aim is to improve the secondary current waveform.

[0007]

[Problems to be Solved by the Invention] However, when the slot 12 is provided in the center leg laminated core 9 in order to improve the secondary current waveform output from the secondary coil 7 as in the past, the slot In the vicinity of 12, the magnetic flux density is high due to the small cross-sectional area of the magnetic path, and especially when magnetic saturation occurs, the magnetic flux leaks from the center leg laminated core 9 to the side leg laminated cores 10 or the case, etc. An attractive force is generated between the This attractive force occurs between each magnetic member and the slot 12 of the center leg laminated core 9, so the force is concentrated in the vicinity of the slot 12, causing the center leg laminated core 9 to vibrate, causing the case etc. also resonate and generate noise.

Furthermore, in order to prevent vibration and noise generation, the ballast body 13 is generally impregnated with varnish or filled with an insulating resin compound.
2 is provided in the central leg laminated core 9 inside the coil bobbin 1, so that varnish or resin compound is difficult to penetrate into the slot 12, and the effect of preventing vibration and noise generation is low.

[0009] The present invention was made in view of the above points, and it is possible to adjust the amount of magnetic flux passing through the secondary coil by providing slots in the laminated iron core, and to adjust the waveform of the secondary current output from the secondary coil. The object of the present invention is to provide an improved ballast for a discharge lamp that reliably prevents vibration and noise from occurring near the slot.

0010

[Means for Solving the Problems] The present invention provides an outer iron type discharge lamp comprising a primary coil, a secondary coil, a coil bobbin around which each coil is wound, and a laminated iron core into which the coil and coil bobbin are inserted. In the ballast, the laminated core has a central leg portion disposed inside the coil and coil bobbin, and a side leg portion disposed outside the coil and coil bobbin, and the side leg portion of the side leg portion has a central leg portion disposed inside the coil and coil bobbin. A slot is formed along the lamination direction in the magnetic path of the magnetic flux passing through the secondary coil,
This slot portion is fixed in the stacking direction with a fixing member.

[0011]

[Operation] In the present invention, the slots provided in the side legs of the laminated core reduce the magnetic path cross-sectional area of the magnetic flux passing through the secondary coil to adjust the amount of magnetic flux, and the secondary coil output from the secondary coil Improve current waveform.

Furthermore, since slots are provided in the side legs disposed outside the coil and coil bobbin, the slots can be fixed in the stacking direction with a fixing member, and vibrations near the slots can be fixed. and prevent the generation of noise.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

Note that structures that are the same as the conventional structure explained in FIG. 12 are designated by the same reference numerals, and the explanation thereof will be omitted.

In FIG. 1, a coil bobbin 1 has a pair of cylindrical winding frame parts 2 integrally formed with each other, and flange parts 3 are formed at both ends of each winding frame part 2. A terminal portion 4 is formed to protrude from the outer end surface. A plurality of terminals 5 are provided protruding from this terminal portion 4 .

The primary coil 6 and the secondary coil 7 are wound around the outer periphery of each winding frame portion 2 of the coil bobbin 1.

The laminated core 8 is attached to the winding frame portion 2 of the coil bobbin 1.
a substantially T-shaped central leg laminated core 9 inserted inside;
It is comprised of a pair of substantially L-shaped side leg laminated cores 10 disposed on both sides of the coil bobbin 1.

The middle portion of the center leg laminated core 9 is configured as a center leg portion 21 disposed inside the coil bobbin 1, and the end portions of the center leg laminated core 9 and the pair of side leg laminated cores 10 are arranged inside the coil bobbin 1. Side leg part 2 arranged on the outside of
2. A slot 12 is formed along the stacking direction on the inner surface of each side leg laminated core 10, which serves as the side leg portion 22, facing the secondary coil 7.

The pass core 11 is fitted between the flange portions 3 of both winding frame portions 2 of the coil bobbin 1 .

Then, as shown in FIG. 2, the coil 6
, 7, a laminated iron core 8, and a pass iron core 11 are combined to form a ballast main body 13.

After assembling the ballast main body 13, the side leg laminated core 1
A non-magnetic and fluid fixing member 25 such as epoxy adhesive is injected into the slot 12 of the side leg laminated core 10 in the stacking direction as the fixing member 25 hardens.

After that, the ballast main body 13 is placed on the bottom plate 23, and the case 2 covering the top and side surfaces of the ballast main body 13 is installed.
Both ends of 4 are caulked and fixed to the bottom plate 23.

[0023] The discharge lamp ballast formed in this way is
By locally reducing the magnetic path cross-sectional area of the magnetic flux passing through the secondary coil 7 using the slot holes 12 provided in the side leg laminated core 10 and causing local magnetic saturation to adjust the amount of magnetic flux,
The secondary current waveform output from the secondary coil 7 is improved.

By the way, when the slot 12 is provided in the side leg laminated core 10 in this way, the magnetic flux density becomes high in the vicinity of the slot 12 because the cross-sectional area of the magnetic path is small, and especially when magnetic saturation occurs, A magnetic attraction force is generated near the slot 12 by the magnetic flux leaking from the side leg laminated core 10. However, since the slot 12 is fixed in the stacking direction by the fixing member 25, it is possible to prevent the side leg laminated core 10 from vibrating and suppress the generation of noise.

Note that the case 24 facing the open end of the slot 12
Alternatively, if a notch is provided in the bottom plate 23, the fixing member 25 can be injected into the slot 12 through the notch after the bottom plate 23 and the case 24 are assembled to the stabilizer body 13. In this case, when the entire stabilizer body 13 is impregnated with varnish, the varnish of the fixing member 25 can be reliably penetrated into the slot 12.

Next, FIG. 3 shows a second embodiment, in which the slot 12 is connected to the secondary coil 7 of the side leg laminated core 10.
A groove is provided on the outer surface corresponding to the

Next, FIG. 4 shows a third embodiment, in which the slot 12 is connected to the secondary coil 7 of the side leg laminated core 10.
A hole is provided on the inner edge corresponding to the

Next, FIG. 5 shows a fourth embodiment, in which the fixing member 25 is made of non-magnetic synthetic resin or the like. This fixing member 25 has a fitting part 31 that fits into the slot 12, and side leg laminated cores 10 at the upper and lower ends of this fitting part 31.
A flange portion 32 is formed to be joined to the upper and lower surfaces of.

When the fixing member 25 is fitted into the slot 12 of the fitting portion 31, the side leg laminated core 10 is clamped and fixed by the upper and lower flanges 32 from the stacking direction. It is possible to prevent the occurrence of lifting or gaps due to distortion of the iron core pieces.

Next, FIGS. 6 to 8 show a fifth embodiment, in which the stabilizer main body 13 is attached to a cylindrical case 4.
1 and filled with an insulating resin compound 42.

In this case, a slot 12 is formed on the outside of the side leg laminated core 10. The fixing member 25 includes a fitting part 31 that fits into the slot 12, a collar part 32 that is formed wide at the upper and lower ends of the fitting part 31 and joins to the upper and lower surfaces of the side leg laminated core 10,
The side leg laminated core 10 has a joint portion 33 that is joined to the outer surface of the side leg laminated core 10.

Then, as shown in FIG. 7, the stabilizer main body 1
3 is assembled, caps 43 are fitted to both end surfaces of the laminated core 8 for temporary fixation, and the fixing members 25 are fitted into the slots 12 of the side leg laminated core 10 and inserted into the case 41. At this time, each terminal 4 at both ends of the ballast main body 13 is attached to both ends of the case 41.
An end member 45 having a plurality of terminals 44 butt-connected is closely fitted.

Then, the case 41 is filled with a resin compound 42 . When this resin compound 42 hardens, the resin compound 42 contracts, so that the clamping force of the side leg laminated core 10 by the fixing member 25 can be increased to ensure secure fixation.

In the case of this embodiment, since the fixing member 25 is attached to the outside of the side leg laminated core 10, the fixing member 25
5 functions as a spacer between the side leg laminated core 10 and the case 41, and can keep the distance constant. Therefore, the amount of leakage magnetic flux from the side leg laminated core 10 passing through the case 41 becomes constant, and the electrical characteristics can be stabilized.

Next, FIG. 9 shows a sixth embodiment, in which the fitting portion 3 of the fixing member 25 of the fifth embodiment is
1 is provided with a groove 34 that penetrates the collar 32. As a result, when filling the resin compound 42, the resin compound 42 sufficiently enters the slot 12 of the side leg laminated core 10 through the groove 34 of the fixing member 25. Therefore, the vicinity of the slot 12 of the side leg laminated core 10 can be reliably fixed by clamping from the stacking direction by the fixing member 25 and fixing by hardening the resin compound 42.

Next, FIGS. 10 and 11 show a seventh embodiment, in which the slot 12 of the side leg laminated core 10 is
The fixing member 25 is attached to the inner side where the fixing member 25 is provided. This fixing member 25 has a width between the flange portions 3 on both sides around which the secondary coil 7 is wound, and a fitting recess 35 that fits into the flange portion 3 on both sides. is provided.

As shown in FIG. 11, when the stabilizer main body 13 is assembled, the fitting recesses 35 on both sides of the fixing member 25 attached to the inside of the side leg laminated core 10 fit into the secondary coil 7.
It fits into the flange parts 3 on both sides of.

Therefore, the fixing member 25 is interposed between the secondary coil 7 and the side leg laminated core 10 to shield them. Therefore, the secondary coil 7 with a high voltage to ground is connected to the side leg laminated core 10.
Since it is not necessary to wrap insulating paper around the outer periphery of the secondary coil 7, costs can be reduced and the structure is suitable for automatic assembly. In addition, by adjusting the thickness of the joint 33 of the fixing member 25, the outer surface of the joint 33 can be joined to and pressed against the outer peripheral surface of the secondary coil 7, thereby preventing vibrations of the secondary coil 7. can do.

[0039]

[Effects of the Invention] According to the present invention, the laminated iron core is provided with slots to adjust the amount of magnetic flux passing through the secondary coil, thereby improving the secondary current waveform output from the secondary coil. In the ballast, by providing a slot in the side leg part arranged outside the coil and coil bobbin, the slot part can be fixed in the stacking direction with a fixing member, reducing vibration and noise near the slot. can be reliably prevented from occurring.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a ballast for a discharge lamp according to the present invention.

FIG. 2 is a partially cutaway perspective view of the assembled state.

FIG. 3 is a perspective view of a side leg laminated core showing a second embodiment.

FIG. 4 is a perspective view of a side leg laminated core showing a third embodiment.

FIG. 5 is a partial perspective view showing a fourth embodiment.

FIG. 6 is a perspective view of the fifth embodiment in an exploded state.

FIG. 7 is a perspective view of the assembled state.

FIG. 8 is a sectional view of the device stored in the case.

FIG. 9 is a perspective view of a fixing member showing a sixth embodiment.

FIG. 10 is a partial perspective view showing a seventh embodiment.

FIG. 11 is a perspective view of the assembled state.

FIG. 12 is an exploded perspective view of a conventional discharge lamp ballast.

[Explanation of symbols]

1 Coil bobbin 6 Primary coil 7 Secondary coil 8 Laminated iron core 12 Slot hole 21 Central leg 22 Side legs 25 Fixed member

Claims (1)

[Claims] 1. A ballast for a discharge lamp of an outer iron type comprising a primary coil and a secondary coil, a coil bobbin around which each of the coils is wound, and a laminated iron core into which the coil and coil bobbin are inserted, wherein the laminated iron core has a central leg disposed inside the coil and coil bobbin, and a side leg disposed outside the coil and coil bobbin,
A stable discharge lamp characterized in that a slot is formed along the lamination direction in the magnetic path portion of the magnetic flux passing through the secondary coil of the side leg, and this slot portion is fixed in the lamination direction with a fixing member. vessel.