JPH01308006A - Method of connecting coil to circuit board - Google Patents

Abstract

PURPOSE:To prevent the direct application of external force to a coil at the time of connection by bending the winding-start end and winding-end end of the coil wound and laminated to an approximately triangular type, manufacturing a terminal section and connecting the terminal section to a circuit terminal implanted onto a circuit board. CONSTITUTION:A terminal section 2 formed by bending the winding-start end of a coil and a terminal section 3 shaped by bending the winding-end end of the coil are formed to the coil 1 prepared by winding and laminating a conductive layer and an insulating layer to an approximately triangular shape. Springy terminals 6a, 6b, 6c, 6d are soldered and fixed to pattern land sections 5a, 5b, 5c, 5d shaped onto a board 4. The terminal sections 2, 3 are pushed between the terminals 6a, 6b and 6c, 6d, thus holding the terminals 2, 3 by the spring action of the bent sections of the terminals 6a, 6b and 6c, 6d. Connection is also simplified, manufacturing cost and productivity are improved, and defective coils and decreased because the possibility of the application of external force to coil itself is removed when the terminal sections are connected to the circuit board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit board for a drive circuit such as a motor, and particularly to a technique for connecting a coil of a motor or the like onto the circuit board.

[Prior art]

Coil technology for flat-type rotor and stator motors, which are often used in VTRs, is the following: ] Rice-ball-shaped coil coils made of copper wire wound in a rice-ball shape.
Sheet-shaped coils using flexible printing to flatten the motor III In particular, there are laminate-type coils that have been developed over the past few years.

Each of the above-mentioned coils has its own advantages and disadvantages, and among them, the above-mentioned laminated coil has many advantages such as a high space factor (high torque can be obtained) and a lower unit price of Co5t than sheet coils.

[Problem to be solved by the invention] However, the coil thickness of a laminated coil when used in audio equipment and video equipment is about 10 to 100μ, and while the space factor is improved by laminating the windings, the film thickness is Because it was extremely thin, there were problems that needed to be solved in connecting the terminal to the circuit board.

JP-A-63-13305 is a document that discloses terminal connections of laminated coils.

The technique according to the above-mentioned publication is such that a rod-shaped terminal portion extending in the thickness direction of the coil is integrally disposed on the outer circumferential surface and/or the inner circumferential surface of the coil. According to the terminal connection shown in the above publication, the start and end of the winding of the coil are made into rod-shaped terminals, and there is a possibility that the contact area between the coil surface and the rod-shaped terminals becomes small, or that poor continuity occurs. be. In order to prevent this, it is necessary to use a conductive adhesive, and it is also necessary to use an adhesive on top of the conductive adhesive to reinforce it.

Further, when providing the rod-shaped terminal portion, an external force such as heat is directly applied to the coil, which may cause adverse effects such as short circuit and deformation.

[Means for solving the problem (and operation)] According to the present invention, the winding start end and winding end of the coil are bent to form a terminal part, and the terminal part is implanted on a circuit board. This prevents external force from being applied directly to the coil during connection by connecting it to the circuit terminal.

〔Example〕

FIG. 1 is a drawing that best represents the features of the present invention,
In the figure, 1 is a coil made by winding and laminating a conductive layer and an insulating layer in a roughly rice ball shape, 2 is a terminal portion by bending the starting end of the coil, and 3 is a terminal portion by folding the ending end of the coil. The bent terminal part, 4 is the board, 5a.

5b, 5c, and 5d are pattern land portions provided on the substrate 4, and 6a, 6b, 6c, and 6d are leaf spring-like terminals provided on the substrate side.

Next, the above configuration and operation will be explained.

The starting and ending ends of the coil L are made by winding and laminating a metal foil with good conductivity coated with an adhesive layer with an insulating function the required number of times so as to obtain the required width and thickness. It forms the diffraction return terminal portion 2.3.

Here, the terminal surface is a conductive layer.

This is the overall size coil section obtained through the above steps.

Next, a second
As shown in the figure, the dogleg-shaped terminal 6a is fixed by soldering.

Similarly, the terminal 6b is fixed to the pattern land portion 5b.

By pushing the terminal portion 2 having a thickness such that A<B between the terminals 6a and 6b, a spring action of the bent portions 6a and 6b is generated to sandwich the terminal 2.

Similarly, by soldering and fixing the terminal 6C to the pattern land 5c, and by soldering and fixing the terminal 6d to the pattern land 5d, the coil terminal 3 can be held between the terminals 6c and 6a. .

By forming the external connection terminals 2 and 3 using metal foil for manufacturing the coil as described above, it is possible to connect another member such as a copper rod for forming the terminal and that member to the copper foil. This eliminates the need for soldering and other processes, and reduces manufacturing costs.

Furthermore, since no force is applied to the coil l itself when connected to the board, there is no need to worry about deformation, improving reliability.

In addition, by connecting to the board using a leaf spring-like terminal, the operation of pushing it in is only required, eliminating the need for soldering and other steps, making assembly operations easier, reducing work man-hours, and reducing the number of parts. Productivity improved as a result of this reduction.

In the above embodiments, the coil shape is approximately rice ball shape, but the shape is not limited to the above shape, and may be, for example, round or square.

Further, in the above embodiments, the coil terminal portion is folded several times, but the shape is not limited to the above-mentioned shape (for example, the coil terminal portion may be wound several times in a round shape or an irregular shape).

Further, in the above embodiment, a spring terminal section is provided on the board and a coil terminal section is inserted into the substrate, but the coil terminal section may be directly connected to the terminal section by soldering or the like.

〔Effect of the invention〕

As explained above, by bending the winding start end and the winding end end of the coil to form a terminal part, and connecting the terminal part to the circuit terminal implanted on the circuit board, soldering is possible. The terminal section can be created without using adhesives or other processes, and connection is also very simple, improving manufacturing costs and productivity. Since there is almost no need to worry about external force being applied, this has the effect of reducing coil defects.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a method of connecting a coil and a circuit board according to the present invention, and FIG. 2 is a perspective view of a circuit terminal implanted on the circuit board. 1 is a coil, 2 and 3 are terminal parts, 4 is a circuit board, and 5a. 5b, 5c, 5d are pattern land parts, 6a, 6b
, 6c. 6d is a circuit terminal. Applicant Canon Co., Ltd. −

Claims (1)

[Claims] (1) A conductive wire is wound and laminated in a substantially rice ball shape or a circular shape to form a coil shape, the winding start end and the winding end end of the coil are bent to form a terminal part, and the terminal part is connected to a circuit. A method for connecting a coil and a circuit board, characterized in that the coil is connected to a circuit terminal planted on the board.