JPS6086811A - Ballast for discharge lamp - Google Patents

Abstract

PURPOSE:To remove the compression of a coil surface on the caulking of both covers by the corners of the bent sections of an upper cover by forming contact pieces in length being in contact with the outer circumference of the collar of a coil bobbin on both sides of the bent sections on both sides of the upper cover. CONSTITUTION:Contact pieces 10 in length being in contact with the outer circumference of the collar 9 of a coil bobbin are each formed on both sides of bent sections 6' on both sides of an upper cover 5'. Consequently, force from side surfaces applied to the bent sections 6' of the upper cover 5' through a lower cover 4 is received by the outer circumference of the collar 9 of the coil bobbin by the contact pieces 10 when a core is surrounded from upper and lower sections by the upper cover 5' and the lower cover 4 and both ends of the lower cover 4 are bent to the inside and caulked, thus resulting in no direct compression of a coil surface by the corners of the bent sections 6' of the upper cover 5'. Accordingly, the damage of a coil 1 can be prevented on the caulking of the upper and lower covers 5', 4.

Description

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

[Background of the invention]

Conventionally, in an exposed type discharge lamp ballast that is not housed in a ballast case, as shown in FIGS. 1 and 2, a core 2 with a coil 1 attached thereto is placed between a lower cover 4 having a mounting hole 3 and a coil section that covers the core 2. The caulked core 2 was supported by surrounding it from above and below with an upper cover 5, and by bending both ends of the lower cover 4 as shown by dotted lines in FIG. Since the core 20 has terminals 7 connected to the ends of the coil 1 on both sides or one side, the upper cover 5 is usually in the form of a strip with a width that covers the coil 10 except for both ends, as shown in FIG. A steel plate was used, and groove-shaped bent portions 6 were formed at both ends thereof substantially along the surfaces of the coil 1 and core 2. The upper cover 5 formed in this way covers the upper surface of the coil 1, and when bending both ends of the lower cover 4 that surrounds the core 2 from below and fastening the bent portion 6, the upper cover 5 is Since a force directed downward from the top and a force directed inward from both sides are applied, the corners 8 of the bent portions 6 at both ends of the upper cover 5 press strongly against the surface of the coil 1, as shown in FIG. This caused damage and caused a rare short circuit. In addition, the upper surface of the cover 5 was bent due to the above-mentioned side force, which caused problems in marking the specifications.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a discharge lamp ballast in which the coil is not damaged when the upper cover is fastened with the lower cover.

[Summary of the invention]

The present invention provides a discharge lamp ballast in which a core equipped with a coil is surrounded from above and below by an upper cover and a lower cover, both ends of the lower cover are bent, and the bent portions of both ends of the upper cover are clamped and secured. By providing contact pieces long enough to contact the outer periphery of the collar of the coil bobbin on both sides of the bent portions at both ends of the upper cover, the corners of the bent portions of the upper cover are This prevents the coil surface from being pressed too hard.

[Embodiments of the invention]

Embodiments of the present invention will be described with reference to the drawings. FIG. 5 is a plan view showing an embodiment of the discharge lamp ballast according to the present invention, and FIG. 6 is an external perspective view of the upper cover in the above embodiment. lol
, 5, both ends of the lower cover 4 that surrounds the core 2 on which the coil 1 is mounted are bent and the bent portions 6' at both ends of the upper cover 5' are clamped. As shown in FIG. 6, contact pieces 10 having a length to abut on the outer periphery of the collar 9 of the coil bobbin are provided on both fllls of the both end bent portions 6'. Therefore, the upper cover and lower cover 4
When the core is surrounded from above and below by the contact pieces 10 and both ends of the lower cover 4 are bent inward and caulked, the force from the sides applied to the bent portion 6' of the upper cover 5' via the lower cover 4 is absorbed by the contact piece 10. As a result, the coil 1 is received by the outer periphery of the collar 9 of the coil bobbin, and the corner of the bent portion 6' of the upper cover does not directly press the coil surface. Therefore, the coil 1 is not damaged when the upper and lower covers 5' and 4 are caulked. There is no. Also, the upper cover 5'
Since the force from the sides of the upper cover 5' is limited, the upper surface of the upper cover 5' is not deformed, and specifications can be stamped without any trouble. In FIG. 6, the contact piece 10 is located at the bent portion 6' of the upper cover 5'.
However, the shape of the contact piece 10 is acceptable as long as it can withstand the force applied from the outside of the lower cover 4 and come into contact with the collar 9 of the coil bobbin.

〔Effect of the invention〕

The discharge lamp ballast according to the present invention is made up of a core equipped with a coil that is surrounded from above and below by an upper cover and a lower cover, both ends of the lower cover are bent, and the bent portions of both ends of the upper cover are clamped. In the electric light ballast, contact pieces long enough to come into contact with the outer periphery of the collar of the coil bobbin are provided on both sides of the bent portions at both ends of the upper cover, so that when the lower cover is bent and caulked, the upper cover is bent. The corner of the bent portion of the cover does not press against the coil surface, thereby preventing damage to the coil and occurrence of a layer short. Furthermore, since the portion of the upper cover that comes into contact with the core is longer than that of conventional products, the tightening surface of the core is increased, making it possible to reduce noise caused by core vibration.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional discharge lamp ballast, Fig. 2 is a sectional view of the ballast, Fig. 3 is a perspective view showing the top cover of the ballast, and Fig. 4 is an assembly of the ballast. FIG. 5 is a plan view showing an embodiment of the discharge lamp ballast according to the present invention, and FIG. 6 is a perspective view of the appearance of the upper cover in the above embodiment. 1... Coil, 2... Core, 4... Lower cover, 5
'...Top cover, 6'...Both end bent parts, 9...Coil bobbin collar, 10...Contact piece

Claims (1)

[Claims] In a discharge lamp ballast in which a core equipped with a coil is surrounded from above and below by an upper cover and a lower cover, both ends of the lower cover are bent and the bent portions of both ends of the upper cover are clamped, the upper cover is A discharge lamp ballast characterized in that contact pieces long enough to come into contact with the outer periphery of a collar of a coil bobbin are provided on both sides of the bent portions at both ends.