JPS61234016A - Discharge lamp ballast - Google Patents

Abstract

PURPOSE:To perform the effect against a noise by sufficiently impregnating varnish in a ballast while holding an engagement closely in some degree between members so that the varnish resin does not flow down from the other end of the ballast during the treatment of the resin on the end of the ballast. CONSTITUTION:Varnish resin 19 is dropped from a ballast end 18, but flowed through slots 17 into a passage 16, and flowed from the passage 16 to the laminated surface of the central leg 1a of a laminated core 1. In this case, ballast members are closely engaged except the slots 17 formed at bobbin tongs 4b, 8b so that the resin 19 is not flowed down from the other end side during the treatment at the one end side, the resin is sufficiently flowed to the laminated surface of the ballast end 18 and the leg 1a, thereby performing a noise effect.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a discharge lamp ballast.

BACKGROUND OF THE INVENTION Generally, ballasts of this type are treated with varnish as a noise countermeasure. As this varnish treatment, there is a method in which the entire ballast is immersed in a varnish bath and then heat-dried. According to this method, varnish impregnation is sufficiently carried out in the varnish tank.

The effect on noise is also sufficient and no special structure is required.

Problems to be Solved by the Invention However, with ballasts in which varnish is applied by dropping varnish onto both end faces of a laminated core and curing the varnish, the varnish does not penetrate into the ballast sufficiently; The effect is not fully demonstrated. This point will be explained in detail. First, in such a ballast that drips varnish onto both end faces of a laminated core and hardens it, in order to harden the dripped surface in a short time after dropping the varnish, it is recommended to harden the surface using an ultraviolet curing varnish or the like. is common. Also, the varnish that has penetrated into the stabilizer will be hardened by heating. Here, when dropping varnish on the end face of the ballast, the varnish is dripped and cured on one end face at a time.
It takes a certain amount of time to process one end face. For this reason, if the fit of these parts is not tight to some extent at the end face of the ballast formed by the laminated core, bobbin, case, bottom punch, etc., that is, the varnish dripping surface, during the processing of one end face. The varnish runs down inside the ballast,
It will run down the other end and contaminate the ballast. Furthermore, a sufficient amount of glue varnish does not remain on the dripping surface and inside the ballast, reducing the effectiveness of the varnish treatment.

Accordingly, the present invention provides a method for applying sufficient varnish resin to the interior of the ballast while maintaining a tight fit between the members to prevent the varnish resin from flowing down from the other end surface during processing. The object of the present invention is to obtain a discharge lamp ballast that can be penetrated and exhibit an effect on noise.

Means for Solving the Problems The present invention provides a discharge lamp ballast in which a resin 19 is dripped onto the laminated core 1 from the end face 18 of the ballast and cured. leg insertion port 4a,
A narrow passage 16 is formed along the laminated surface by the inner wall of the core 8a and the core laminated surface of the central leg 1a, and the bobbin tongues 4b and 8b of the bobbins 4 and 8 that sandwich the laminated core 1 are communicated with the passage 16. A configuration is adopted in which a groove 17 for resin injection is formed.

The working varnish resin 19 drips from the ballast end face 18 and flows into the passage 16 through the groove 17 and from this passage 16 into the lamination surface of the central leg 1a of the laminated core 1. At this time, the bobbin tongue portion 4b.

The ballast components are tightly fitted except for the groove 17 formed in the ballast 8b, and the varnish resin 19 does not flow off from the other end during processing on one end, and the ballast end 18 and the laminated surface of the central leg 1a, and the noise effect is exhibited.

Example An embodiment of the present invention will be described based on the drawings.

First, the structure of the discharge lamp ballast to which this embodiment is applied is explained in the third section.
This will be explained with reference to the drawings and FIG. As the laminated core, a T-shaped laminated core 1 and two L-shaped laminated cores 2 and 3 are provided. Bobbins 4 to 8 are provided to be inserted into the center leg 1a of the laminated core 1. The bobbin 4 is for the primary coil 9, the bobbin 5 is for the bus core 10, the bobbin 6.7 is for the filament coil 11.12, and the bobbin 8 is for the secondary coil 13. After these are assembled, the periphery is surrounded by the case 14 and the bottom plate 15 to form a stabilizer. Here, a ballast mounting hole 15a is formed in the bottom plate 15, a rubber bushing is mounted in the ballast mounting hole 15a, and the ballast is mounted to a circuit board via this rubber bushing. Further, the bottom plate 15 is formed with inwardly projecting beats 15b for positioning both ends of the bobbins 4 and 8.

In the central leg insertion opening 8a of the bobbin 8 for the laminated core 1, the edge facing the corner in the stacking direction of the T-shaped laminated core 1 is rounded as shown in FIG. The laminated core 1 and the bobbin 8 form a passage 16 along the lamination direction. A bobbin 8 is stretched so as to sandwich the laminated core 1.
The bobbin tongue portion 8b has a groove 17 communicating with the passage 16.
are formed at the four corners. Such a passage 16 and groove 1
7 is similarly formed at the end on the bobbin 4 side, and is designated by the same reference numeral.

In such a configuration, case 1 as shown in FIG.
4. After the ballast is completed by incorporating the bottom punch 15 and the like, varnish resin 19 is dripped from the ballast end face 18. The varnish resin 19 dropped onto this end surface 18 is applied to the bobbin tongue 8.
It flows into the groove 17 formed in b. The varnish resin 19 that has flowed into the groove 17 further flows along the passage 16.

This passage 16 runs along the lamination direction of the laminated core 1, and flows from this part into the gap between the inner wall of the bobbin 8 and the laminated surface of the laminated core 1, as shown in FIG. Spreads over the laminated surface. This is a varnish treatment on one end face of the ballast, and is similarly performed on the end face on the bobbin 4 side.

In this way, according to this embodiment, in the portions other than the grooves 16 formed in the bobbin tongues 4b and 8b of the bobbins 4 and 8, the laminated cores 1 and 2, the bobbins 4 to 8, the case 14, the bottom plate 15, etc. Since the parts are tightly fitted, the dropped varnish resin 19 accumulates in the ballast end 18 and at the same time flows into the groove 17, and only a small amount flows into other parts. The varnish resin 19 flowing into the laminated surface of the central leg 1a through the groove 17 and the passage 16 will not flow down to the other end surface during the varnish treatment on the end surface of the bobbin 4, 8 and the laminated iron core. This is a small gap between the laminated surface of No. 1 and the laminated surface, and after it spreads over the laminated surface, it is maintained by its own surface tension and is not large enough to flow down. Furthermore, in this embodiment, since the bus core 10 that separates the secondary coil 9 and the secondary coil 13 divides the laminated surface of the laminated iron core 1 into two through an adhesive, the varnish resin 19 flowing in from one side
will stop at this part. Since the varnish resin 19 is thermally dried in this state, the varnish resin 19 that has flowed into the ballast end face 18, the laminated surface of the central leg 1a, and other parts is cured in that state.

The amount of varnish dripped can be used effectively enough to exhibit the noise prevention effect6.In particular, in such a ballast, the center leg 1a is the location where the vibrational energy is greatest in response to noise. Since the varnish resin 19 is known in the art, as in this embodiment, the varnish resin 19 is applied toward the laminated surface of the central leg 1a.
It is most effective to have an inflow of In addition, since the mechanical pressure on both end faces of the ballast is weak and the distribution of magnetic lines of force is complicated and vibrations are likely to occur, the varnish resin 19 is applied to both end faces of the ballast as in this embodiment. In addition to suppressing vibrations, varnish resin 1 is applied to the laminated surface of the central leg 1a.
9 to suppress the vibration of the central leg 1a.

Effects of the Invention As described above, the present invention has a narrow passage formed by the central leg insertion opening of the bobbin and the laminated surface of the central leg, and
Since grooves for resin injection are formed in the bobbin tongue, the parts other than these grooves and passages are tightly fitted between the ballast components, and if resin is dripped onto the end face of the ballast, the grooves and The resin can be poured into the laminated surface of the central leg of the laminated iron core through the passageway, and the resin can be prevented from flowing down from the other end surface, so that the noise effect can be fully exhibited.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of a bobbin, Fig. 2 is a partially cutaway perspective view showing the inflow state of varnish resin, and Fig. 3 is a cross section showing the ballast structure. Figure, 4th
The figure is a perspective view showing the ballast structure. 1... Laminated iron core, la... Center leg, 4, 8... Bobbin, 4a, 8a... Center leg insertion slot, 4b, 8b...
・Bobbin tongue, 16... passage, 17... groove, 18.
...Ballast end face. 19... Varnish resin applicant Tokyo Electric Co., Ltd. J" ■ 5LL Figure 16 -

Claims (1)

[Claims] In a discharge lamp ballast in which resin is dripped onto the laminated core from the end face of the ballast and cured, the inner wall of the central leg insertion opening of the laminated core formed on the bobbin and the core laminated surface of the central leg cause the laminated surface to A discharge lamp ballast characterized in that a narrow passage is formed along the laminated iron core, and a groove for resin injection communicating with the passage is formed in a bobbin tongue of the bobbin that sandwiches the laminated core.