JPH0579924U - Flat coil - Google Patents

Abstract

(57) [Summary] [Purpose] A flat core is sandwiched between a pair of flat, cross-shaped bobbin pieces, and the coil is wound around the outer surface of the piece to maintain good isolation between the coils. Providing flat transformers at low cost. [Structure] Side plates 3 and 3 are formed between opposing ribs 2 and 2 of paired bobbin pieces 1 and 1 formed of plastic in a substantially cross shape, and the opposing ribs 2 and 3 are formed from the inner surfaces of these side plates 3 and 3. End of 2
The wall thickness of the I-shaped flat core 4 in which the lower halves in the thickness direction are fitted and stored by contacting the outer edges of the respective end points 2a, 2a and the inner edges of the facing ribs 2, 2 by projecting 2a, 2a. Another bobbin piece 1 was fitted and covered in the upper half of the direction in the same manner as above, and the coil L was wound around the outer surface of the opposing ribs 2, 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat coil suitable for use in a high frequency transformer or a choke coil in an inverter power supply or the like in which a flat core is covered with two flat bobbins in a cross beam shape and a coil is wound on the flat bobbin.

[0002]

[Prior Art]

 As an example in which a coil is wound around a bobbin having a frame-shaped window hole, there is a conventional one described in Japanese Utility Model Laid-Open No. 57-138304.

This conventional technique is a coil in which a window hole is provided in a coil winding portion of a bobbin, and a part of a core installed in the bobbin is fitted in the window hole.

[0004]

[Problems to be solved by the device]

 Since the above-mentioned conventional technology is a coil in which a core whose cross section is close to a square is inserted into a bobbin of a cage frame with a collar, only a so-called sloping three-dimensional coil with equal proportions in length, width and height can be obtained. It was not possible to prevent the flattening of the circuit board.

As a simple flat coil, there have been spider coils and loop antenna coils that have been used for Natsukashi's ore radio for a long time, but these flat coils are air-core and have low efficiency. There was a problem that winding was impossible.

In order to eliminate the above-mentioned problems, the present invention attaches a pair of flat, cross-shaped bobbin pieces with a flat core sandwiched between them, and winds a coil around the outer surface of the flat bobbin-shaped bobbin pieces to form a coil between the coils. The objective is to provide a flat transformer that can maintain good isolation of the product at low cost.

[0007]

[Means for Solving the Problems]

 The above-mentioned object of the present invention is to form side plates on the left and right of the opposing ribs of a pair of bobbin pieces formed of plastic in a substantially cross beam shape, and project the end of the opposing rib from the inner surface of each side plate. A lower half in the thickness direction is fitted between the outer edge of each end and the inner edge of the facing rib, and another bobbin piece is fitted in the upper half in the thickness direction of the I-shaped flat core which is stored. This can be achieved by covering them together and winding a coil around the outer surface of the facing rib.

The outer magnetic path core may be fixed between the wide side edges of the flat core, and the terminal plate may be sandwiched between the opposing gaps of the left and right side plates of the pair of bobbin pieces.

[0009]

[Action]

 Other bobbin pieces are placed in the upper half of the thickness direction of the I-shaped flat core in which the lower half in the thickness direction is fitted between the opposing ribs of the pair of bobbin pieces formed by forming plastic into a substantially cross shape. When the coil is wound on the outer surface of the facing rib, the bobbin piece does not sway or come off with respect to the flat core. It can be tidy and tidy quickly.

Further, if the outer magnetic circuit core is fixed between the wide side edges of the flat core, a closed magnetic circuit type coil with a core is formed, and its inductance can be increased.

Furthermore, by sandwiching the terminal plate in the facing gap of the left and right side plates of the pair of bobbin pieces, the lead wire of the coil can be processed surely and the mounting on the external circuit member such as the printed circuit board is easy. And surely it can be realized.

[0012]

【Example】

 Examples will be described with reference to the drawings. First, as shown in FIGS. 1 and 2, the basic structure of the present invention is to form side-plates on the left and right sides of opposing ribs 2 and 2 of a pair of bobbin pieces 1 and 1 formed by heat-resistant plastic such as phenol resin formed in a substantially cross beam shape. 3, 3 are formed so that the ends 2a, 2a of the facing ribs 2, 2 project from the inner surface of each of the side plates 3, 3.

The I-shaped flat core 4 having the lower half in the thickness direction fitted and stored as shown in FIG. 2 is in contact with the outer edge of each of the ends 2a, 2a and the inner edge of the opposed ribs 2, 2. The other half of the bobbin element in the thickness direction is fitted and covered as shown in FIGS. 1, 4 and 5 in the same manner as above, and the outer surface of the opposing ribs 2, 2 is The coil L is wound as shown in FIGS. 5 and 6 to form the flat coil according to the present invention.

If the flat core 4 having an insulating coating is used, it can be used as a coil for high voltage.

If the outer magnetic path core 5 is fixed between the wide side edges 4a, 4a of the flat core 4 as shown in FIG. 7, the inductance of the coil L can be increased.

Further, if the terminal plate 6 having the terminal pin 6a is sandwiched between the left and right side plates 3, 3 of the pair of bobbin pieces 1, 1 in the facing gap g as shown in FIG. The lead wire processing can be performed easily and surely, and the soldering mounting on the circuit board P can be easily realized as shown in FIG.

The flat coil of the present invention has the above-mentioned configuration, and the operation thereof will be specifically described below. I-shaped flat core 4 in which the lower halves in the thickness direction are fitted and stored as shown in Fig. 2 on the left and right sides of the opposing ribs 2,2 of the pair of bobbin pieces 1,1 formed of plastic in a substantially cross shape. Since another bobbin element 1 was fitted and covered in the upper half of the thickness direction of the same as above, when the coil L was wound on the outer surface of the facing ribs 2,2, the flat core 4 was On the other hand, since the bobbin pieces 1 and 1 do not sway or come off inadvertently, the coil L can be wound beautifully, neatly and quickly.

Further, if the outer magnetic circuit core 5 is fixed between the wide side edges 4a, 4a of the flat core 4 as shown in FIG. 7, a closed magnetic circuit type cored coil can be obtained and its inductance can be increased. Furthermore, if the terminal plate 6 having the terminal pin 6a is sandwiched in the facing gap g of the left and right side plates 3,3 of the pair of bobbin pieces 1,1 as shown in FIG. The line processing can be reliably performed, and the mounting on the external circuit member P such as a printed circuit board can be realized easily and surely.

[0019]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. The flat coil according to claim 1 has the first effect that a flat coil can be realized as a whole, and at the same time, since two of the cross-shaped bobbin pieces are engaged with the I-shaped flat core, The coil can be wound in an orderly and quick manner, and since the two bobbin pieces 1 and 1 are combined, the second and third effects of being able to absorb variations in the thickness of the flat core 4 well are also provided.

According to the second aspect, the closed magnetic circuit can be formed together with the I-shaped flat core 4 by the one-character outer magnetic circuit core 5, and the effect of increasing the inductance of the flat coil can be added.

In claim 3, since the terminal plate 6 having the terminal pins 6a and the like is sandwiched in the facing gap g of the left and right side plates 3,3 of the pair of bobbin pieces 1,1, the leads of the coils L, L It is possible to add the effect that the line processing can be performed reliably and that it can be easily and reliably mounted on an external circuit member such as a printed circuit board.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a combination of a bobbin piece and a flat core before winding a coil.

FIG. 2 is a perspective view showing a state immediately before combining the above.

FIG. 3 is a side view of what is shown in FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along line BB of FIG. 3 with the coil wound.

FIG. 6 is a sectional view taken along the line of FIG.

FIG. 7 is a cross-sectional plan view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Bobbin piece 2 Opposing rib 2a Termination 3 Side plate 4 Flat core 4a Wide side edge 5 Outer magnetic path core 6 Terminal plate g Opposing gap L coil

Claims (3)

[Scope of utility model registration request] 1. Side plates 3,3 to the left and right of opposing ribs 2,2 of a pair of bobbin pieces 1,1 made of plastic formed in a substantially cross shape.
To form the facing ribs 2, 3 from the inner surfaces of these side plates 3, 3.
The meat of the I-shaped flat core 4 in which the two ends 2a, 2a of the 2 are projected, and the lower half of the thickness direction is fitted between the outer edges of the respective ends 2a, 2a and the inner edges of the facing ribs 2, 2 and stored. A flat coil in which another bobbin element 1 is fitted and covered on the upper half in the thickness direction in the same manner as described above, and a coil L is wound around the outer surface of the facing ribs 2, 2. 2. The flat coil according to claim 1, wherein the outer magnetic path core 5 is fixed between the wide side edges 4a of the flat core 4. 3. The left and right side plates 3, 1 of the pair of bobbin pieces 1, 1.
The flat coil according to claim 1 or 2, wherein the terminal plate 6 is sandwiched in the facing gap g of 3.