JPH09205260A - Resin body containing printed-wiring board and motor stator provided with this resin body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin body in which the pressure force of a mold receiver part is dispersed by installing a means by which a pattern derived to the outside from a resin molded part is protected from a mold. SOLUTION: A stator base 1 composed of a copper-clad iron substrtate on which prescribed circuit patterns 11, 12,... are printed and wired is fixed in such a way that six air-core coils 2,... are radial so as to form a concentric circle from the center, respective terminals including terminals of a Hall element are soldered and connected to the prescribed circuit patterns, and the terminals are molded integrally by a heat-resistant resin J together with a bearing holder 3 arranged in the center. In a mold used for a resin molding operation, the thickness of its outer circumferential part is thin at about 0.3mm in order to escape from an electronic component such as a driving IC or the like, and the circuit patterns 11, 12 for derivation at mold receiver parts are formed as wide-width parts 4, 5, 6. When the mold resin parts in the derived patterns are made wide, a contact pressure can be dispersed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin body including a printed wiring board and a motor stator provided with such a resin body, and more particularly to a motor body for preventing damage to a circuit pattern by a mold.

[0002]

2. Description of the Related Art Conventionally, there has been known a structure in which an electronic component or the like is placed and connected on a printed wiring board to be firmly fixed and integrally molded with a resin for the purpose of preventing intrusion of dust and the like. Recently, in order to reduce the size, it is inevitable to form a fine circuit pattern. Particularly in a motor stator such as a CDROM spindle motor in which a plurality of Hall elements and armature coils are mounted and connected to a printed wiring board, the circuit pattern must be extremely thin.

[0003]

When the circuit pattern is thinned in this way, when the printed wiring board is sandwiched by a mold like a sandwich and resin-molded, the mold escapes from other electronic parts arranged outside. Therefore, the circuit pattern needs to be thinly formed, which may damage or cut the circuit pattern. In particular, a copper-clad iron plate type printed wiring board does not shrink at all, so this problem occurs greatly. An object of the present invention is to solve the above problems by a simple structure without complicating the structure of a mold, and to provide a resin body including a printed wiring board that does not damage a circuit pattern. Especially.

[0004]

In order to solve the above problems, the present invention is provided with a means for protecting a pattern led out from a resin mold portion from a mold. , It is possible to solve problems such as scratches and cutting of the derived pattern.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, as a means for protecting a pattern led out from a resin mold portion, it is preferable to widen a die receiving portion of the led pattern to disperse the contact pressure. .

It is also possible to protect the derived pattern by providing a discard pattern in the mold receiving portion near the derived pattern and receiving the mold at this portion.

Further, for application to a motor stator,
A plurality of armature coils are placed on a stator base having a printed wiring circuit, each terminal is connected to a predetermined circuit pattern, and then integrally molded with resin. In order to protect the derived pattern from the mold, it is preferable to widen the mold receiving portion or form a discard pattern.

With the above arrangement, the pressing force of the mating portion of the mold (mold receiving portion) is dispersed, and the pressing force per unit area becomes small, so that there is no problem such as cutting or scratching of the pattern led to the outside. No problems will occur.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which a resin body containing a printed wiring board according to the present invention is applied to a brushless motor stator is shown in FIG.
It will be described with reference to the perspective view of the main part shown in FIG. 2 and the pattern formation plan view of the printed wiring board shown in FIG. In the figure, 1 is a stator base made of a copper clad iron substrate on which predetermined circuit pattern groups 11, 12, ... Are printed and wired, and six air-core armature coils 2.
The bearing holders 3 are fixed radially with a UV curing agent or the like so as to form concentric circles from the center, and each terminal including the Hall element terminals is soldered to a predetermined circuit pattern and then arranged in the center.
Together with this, it is integrally molded with heat resistant resin J. Since such a resin-molding die escapes from other electronic components such as driving ICs, the outer peripheral portion has a thin thickness of about 0.3 mm. Therefore, the lead-out circuit pattern 11 of the die receiving portion is formed. , 12 and 13 are wide portions 4, 5 and 6. In addition, in the part where there is no derivation circuit pattern, the discard pattern 7,
8 and the like are formed to disperse the pressing force of the die receiving portion.

Although the above has shown the case where the die receiving portion of the deriving circuit pattern is wide, the circuit patterns may be formed close to each other, and the discard pattern may be made large.

In the above embodiment, the stator base is made of a copper clad iron substrate. However, in order to prevent iron loss, a thin glass cloth epoxy substrate or a flexible substrate is attached to a silicon steel plate. May be used as a base.

The present invention can be applied not only to the stator of a brushless motor but also to other electronic component assemblies as long as it is a resin body containing a printed wiring board.

[0013]

EFFECTS OF THE INVENTION Since the present invention is configured as described above, even when the circuit pattern is made thin as the resin body including the printed wiring board, there is no risk of the pattern being scratched or broken during resin molding, and in particular the brushless motor. It is suitable for use on a copper clad iron substrate such as the stator.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of an embodiment in which a resin body including a printed wiring board according to the present invention is applied to a stator of a brushless motor.

FIG. 2 is a plan view of a stator base including the printed wiring board according to the same embodiment.

[Explanation of symbols]

 1 Stator base 11, 12, ... Circuit pattern 2 Air core armature coil 3 Bearing holder J Resin 4, 5, 6 Wide part 7, 8 Discard pattern

Claims (4)

[Claims] 1. A printed wiring board including a printed wiring board having a circuit pattern formed inside and outside a resin molding portion, and a means for protecting a pattern led out from the resin molding portion from a mold. Resin body containing. 2. The resin body including a printed wiring board according to claim 1, wherein the die receiving portion of the pattern derived as the means is widened. 3. The resin body including a printed wiring board according to claim 2, wherein a discard pattern is provided in a mold receiving portion near the pattern derived as the means. 4. A resin body including a printed wiring board formed by mounting a plurality of armature coils on a stator base having a printed wiring circuit, connecting each terminal to a predetermined circuit pattern, and integrally molding the resin with a resin. A motor stator including a resin body including a printed wiring board provided with means for protecting a pattern drawn out from a resin mold portion from a mold in the motor stator including the.