JPH11195544A - Discharging lamp stabilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide deviating movement preventing structure of cores reducing characteristic variation. SOLUTION: Iron cores 4 and 5 forming a magnetic path are provided by joining plural cores 4 and 5. A synthetic resin bobbin 6 assembled to the iron cores 4 and 5 is provided. A coil 3 wound onto the bobbin 6 is provided. Cases 7 and 8 for fastening the entire of the respective members from outside are provided. Pressurize-deforming parts 60 and 61, pressed by a part of the cases 7 and 8 to be deformed to pressurize a part of the core 4, are formed in a body with the bobbin 6 at a part of the bobbin 6. The number of the parts 60 and 61 is two and these two are arranged so as to pressurize a part of the core 4 from both side of it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing a displacement of a core in a discharge lamp ballast.

[0002]

2. Description of the Related Art FIGS. 4 to 6 show a conventional discharge lamp ballast having an iron core for joining a plurality of cores 4 and 5 to form a magnetic path. A bobbin 6 made of synthetic resin is attached to the iron core. The coil 3 is provided around the bobbin 6. Cases 7 and 8 are provided to tighten all of the above members from outside. A pressure deforming portion 60 that is pressed and deformed by a part of the cases 7 and 8 and presses a part of the core 4 is formed integrally with the bobbin 6 on a part of the bobbin 6. Cores 4.5 constituting iron cores 4.5
And the bobbin 6 are slightly loosely connected. For this reason, the cores 4 and 5, particularly the core 4 in the bobbin 6, easily move undesirably, causing factors such as vibration and noise. To solve this problem, the pressurized deformation unit 60 is used. The cases 7 and 8 are composed of a lower base 7 and an upper cover 8. The pressing force of the cover 8 when caulking them is transmitted to the pressurizing deformable portion 60, and the inner core 4 is restrained. This prevents the core 4 from moving in the longitudinal direction. Reference numeral 62 denotes a protrusion attached to the pressure deforming portion 60, and reference numeral 64 denotes an end of the protrusion. Reference numerals 21, 22, and 23 denote dies for caulking. The caulking pressure is applied from the top, bottom, left and right, and the pressure level is adjusted to achieve the required magnetic or electrical properties.

[0003]

The above-mentioned prior art is a one-side pressurizing method in which the pressurizing deformable portion 60 is pressurized from the cover 8 side. The projecting dimension of the projection 62 at the time of pressurization is set so that the core 4 can be pressed with a sufficient force even when the core 4 has a tolerance lower limit of the thickness of the core 4. In this connection, excessive pressure tends to occur.
If the pressure is excessive, as shown in FIG. 6, the bobbin 6 and the core 4 are excessively deformed in reverse by pressurization from above the abutting portion of the two bobbins 6. h ′ is an over-changed dimension measured at the end face of the core 4. In this case, the end face of the core 4 that is excessively deformed and the end face of the core 5 that is not deformed are joined. The end surfaces of the steel plates constituting the core 4 are joined obliquely. The bonding area varies greatly depending on the type of bonding. Undesirable characteristic variations may occur in the prior art discharge lamp ballast, making adjustment difficult, but this adverse effect is caused by excessive deformation of the core 4 in the above-described embodiment. SUMMARY OF THE INVENTION An object of the present invention is to provide a structure for preventing a core from shifting and having less characteristic variation.

[0004]

According to the present invention, two pressure deforming portions are provided on the bobbin, and a part of the core is pressed from both sides by the two pressure deforming portions. In other words, a double-sided pressurization method is used to mitigate the adverse effects of characteristic variations.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 4 to 6 are used as they are in this description, and a part of the overlapping description will be omitted as appropriate. The discharge lamp ballast shown in FIGS.
・ 5 are provided with iron cores 4.5 joining the magnetic paths. A bobbin 6 made of synthetic resin is attached to the cores 4 and 5. The coil 3 is provided around the bobbin 6. Cases 7 and 8 are provided to tighten all of the above members from outside.
Pressing deformation portions 60 and 61 that are pressed and deformed by a part of the cases 7 and 8 to press a part of the core 4 are formed integrally with the bobbin 6 on a part of the bobbin 6. The number of the pressure deforming portions 60 and 61 is 2
The two are arranged so that a part of the core 4 is pressed from both sides thereof. The iron cores 4 and 5 include an I-shaped core 4 penetrating the bobbin 6 and a pair of E-shaped cores 5 arranged on both sides thereof. The cases 7.8 are composed of a lower base 7 and an upper cover 8. Cases 7 and 8 are swaged so as to have a tubular shape. Protrusions 62 and 63 for deforming the pressure deforming portions 60 and 61 are attached. Protrusion 6
Reference numerals 2 and 63 denote forms projecting toward the base 8 and the cover 9, respectively. The protrusion dimensions are such that the protrusions 62 and 63 respectively press against the base 8 and the cover 9 and
1 is determined to be appropriately deformed. During the pressurization,
The pressure deforming portion 60 pushes the core 4 downward, and the pressure deforming portion 61
Pushes the core 4 upward. FIG. 2 shows a state in which the pressure deforming portions 60 and 61 are pressed. Pressing deformation parts 60 and 61 and protrusion 62
63 has a T-shape as a whole, but its protruding ends 64.6
Press 5 strongly with base 8 and cover 9. 21 ・ 22 ・ 23
This is a mold for swaging, and the thick arrow indicates swaging force. The bobbin 6 will be described in more detail. Pressing deformation portions 60 and 61 and protrusions 62 and 63 are formed on upper and lower sides of a flange 66 attached to the bobbin 6. The bobbin 6 has a bobbin 6 at the center and a flange 66 at an end thereof, and press-deformable portions 60 and 61 and protrusions 62 and 63 at the ends. The vicinity of the pressure deforming portions 60 and 61 and the protruding portions 62 and 63 are cutouts 67 and 68 without flanges. The notches 67 and 68 are for allowing deformation or displacement of the pressure deforming portions 60 and 61 and the protrusions 62 and 63. The coil 3 is exposed via the notches 67 and 68. Thus, since FIG. 3 is before three turns of the coil, the terminal part on the opposite side can be seen in FIG. Free ends of the projections 62 and 63, ie, projection ends 64
65 protrudes extra by h1 from the flange 66 near it. This is to strengthen the contact with the base 7 or the cover 8. The bobbin 6 is a molded bobbin integrally formed of a synthetic resin.

[0006] Two bobbins 6 with pressurized deformation parts 60 and 61 are attached to the upper and lower sides, and they are arranged in axial series, and the I-shaped core 4 is penetrated in the axes. Then, a pair of E-shaped cores 5 are arranged from both sides thereof to form iron cores 4.5. Thereafter, the base 8 and the cover 9 are arranged on the upper and lower sides and swaged. Caulking is performed by setting the molds 21, 22 and 23. At that time, 21-8-64-62-
A force is applied in the order of 60, and the pressure deforming portion 60 bends downward and presses the core 4 against each other. Also, 23-7-65-63-
A force is applied in the order of 61, and the pressure deforming portion 61 deflects upward to press the core 4 in pressure. Thus, the core 4 that is easily shifted is prevented from shifting. On the other hand, since the core 4 is pressed from the upper and lower sides by the pressure deforming portions 60 and 61, both ends of the core 4 maintain a predetermined position and posture, and a joint surface of both ends is a joint surface of the core 5. And accurately join. In the above description, the joint surfaces where the cores 4 and 5 are directly joined are assumed, but the opposing surfaces that are opposed to each other with a small gap therebetween are made uniform,
The present invention is also effective for making the facing area uniform. The variation in the facing state has a large effect on the magnetic flux leakage characteristics or leakage impedance of the discharge lamp ballast, but the present invention is also effective in suppressing the variation.

[0007]

According to the present invention, the bobbin is provided with two pressure deforming portions, and a part of the core is pressed from both sides by the two pressure deforming portions. This is effective as a structure for preventing the core from shifting with little characteristic variation.

[Brief description of the drawings]

FIG. 1 is a front view of a discharge lamp ballast according to the present invention.

FIG. 2 is a side view of FIG. 1 together with a caulking step.

3A is a front view and FIG. 3B is a side view showing the bobbin in FIG.

FIG. 4 is a front view of a conventional discharge lamp ballast.

FIG. 5 is a side view of FIG. 4 together with a caulking step.

6A is a front view showing the bobbin of FIG. 4, and FIG. 6B is a side view thereof.

[Explanation of symbols]

3: coil, 4.5: core, 6: bibin, 7.8: case, 21.22.23: mold, 60.61: pressurized deformation part, 62.63: projection, 64.65: projection Division, 66:
Tsuba, 67/68: Notch

Claims (1)

[Claims] An iron core for joining a plurality of cores to form a magnetic path, a synthetic resin bobbin attached to the iron core, a coil wound around the bobbin, A discharge lamp including a case for tightening the whole of the member from the outside, and a pressure deforming portion that is pressed and deformed by a part of the case and pressurizes a part of the core, formed integrally with the bobbin in a part of the bobbin In the ballast, the bobbin is provided with two pressure deforming portions, and the two pressure deforming portions press a part of the core from both sides thereof.