JPH0735373Y2 - Trance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a transformer used in consumer electronic devices or industrial electronic devices.

2. Description of the Related Art Heretofore, this type of transformer has generally been configured as shown in FIGS. The configuration will be described below with reference to the drawings. As shown in the figure, after the magnetic core 3 is incorporated in the coil bobbin 2 having the winding 1, the sheet-shaped non-magnetic metal plate 4 (hereinafter referred to as a metal plate) made of copper or aluminum foil is attached to the winding 1 A ring-shaped short ring 6 was formed by winding one or more turns around the outer peripheral part of the magnetic core 3 incorporated in the coil bobbin 2 and soldering the metal plate 4 and the end face 5 of the winding end part. . Also,
In order to position and fix this kind of short ring 6, an adhesive 7 is applied to the inner surface of the metal plate 4, and the portion to which the adhesive 7 is attached is attached to the outer peripheral portion of the winding 1 and the outer peripheral portion of the magnetic core 3. It was designed to be in close contact.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In such a conventional transformer, the sheet-shaped metal plate 4 is wound one or more times, and the end surface 5 at the end of winding and the end surface 8 at the beginning of winding are wound.
Since the short ring 6 is formed by soldering the overlapping portions of the above, it is difficult to automate the work of winding the short ring 6 and the work of soldering by a machine, and it takes time to install the short ring 6. However, there was a problem that the cost increased.

Further, since the short ring 6 is fixed by the adhesive 7 applied to the inner surface of the metal plate 4, the accuracy of the mounting position of the short ring 6 varies, resulting in large variation in characteristics and peeling of the short ring 6. There is a problem that the quality is deteriorated due to occurrence of misalignment.

The present invention solves the above problems, and an object of the present invention is to provide a transformer that is easy to attach the short ring and has a stable attachment position, and that is excellent in quality and performance.

Means for Solving the Problems To achieve the above object, a transformer according to the present invention comprises a coil bobbin having an upper flange, a coil wound around the coil bobbin, and a coil wound around the coil bobbin. A circular arc-shaped outer peripheral portion covering the portion, a penetrating portion into which a leg portion of a magnetic core continuously provided therethrough is inserted, and a plurality of portions projecting inward from the upper end portion of the outer peripheral portion above the collar of the coil bobbin. The ring-shaped short ring provided with the fixing piece and the magnetic core that holds the fixing piece with the collar while the leg portion is inserted into the penetrating portion.

Action The short ring in the transformer of the present invention is fixed by sandwiching the fixing piece between the collar of the bobbin and the magnetic core, and the short ring can be fixed at a desired position without using an adhesive.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

As shown in the figure, the coil bobbin 11 has a collar 12 at the upper end and a terminal block 13 having terminal pins 14 planted at the lower end.
Winding 16 is provided between 12 and terminal block 13, and a through hole 20 is
have.

The short ring 19 is made of a non-magnetic metal plate in order to reduce the leakage magnetic flux, and is formed into a ring shape by plastic working such as drawing and punching, and the arc-shaped outer periphery 17 and magnetic cores on both sides thereof. A penetrating portion 22 into which 15 is inserted is provided with a fixing piece 18 protruding inward from the end of the outer peripheral portion 17 on the upper surface. The fixing piece 18 is divided by the dividing groove 21 so that a short circuit does not occur at the center.

Further, the magnetic core 15 made of the above-mentioned magnetic material is divided so that its leg portions can be inserted into the through hole 20 of the insulating coil bobbin 11 and the through portion 22 of the short ring 19 from above and below. The outer circumference 17 of the short ring 19 and the outer circumference of the winding 16 and the magnetic core 15
Of the coil bobbin 11
It is sandwiched between the collar 12 and the magnetic core 15.

With the above configuration, the work of winding the short ring 19 to fix the short ring 19 and the soldering work are not necessary, and the short ring 19 can be securely fixed by being sandwiched between the flange 12 and the magnetic core 15, and the fixing accuracy is improved.

EFFECTS OF THE INVENTION As is apparent from the above embodiments, the transformer of the present invention is provided with a fixing piece projecting inward from the upper end of the short ring, and the fixing piece is sandwiched between the collar of the coil bobbin and the magnetic core. Therefore, an adhesive is not required for fixing the short ring, and the fixing state is stable, and reliability, quality, productivity, etc. can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a transformer according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a perspective view of a conventional transformer.
FIG. 4 is an exploded perspective view showing the internal structure. 11 …… Coil bobbin, 12 …… Tsuba, 15 …… Magnetic core, 16 …… Winding, 17 …… Peripheral part, 18 …… Fixed piece, 19 …… Short ring.

Claims (1)

[Scope of utility model registration request] 1. A coil bobbin having a flange on its upper part, a winding wound on the coil bobbin, an arc-shaped outer peripheral portion covering a part of the winding wound on the coil bobbin, and a continuous portion provided continuously with the outer peripheral portion. A ring-shaped short ring provided with a penetrating portion into which the leg portion of the magnetic core is inserted, and a plurality of fixing pieces projecting inward from an upper end portion of the outer peripheral portion above the collar of the coil bobbin; A transformer having a leg portion inserted into the penetrating portion and a magnetic core sandwiching the fixing piece with the collar.