JP4572104B2 - Actuator - Google Patents

Description

  The present invention relates to an actuator for driving a camera element such as a photographing lens such as a camera or a sector that opens and closes a shutter opening.

  Conventionally, camera elements such as a camera taking lens and a shutter are generally driven by an actuator. Such an actuator is formed by energizing a coil with a stator formed by winding a coil around a bobbin. And a rotating rotor. Here, in order to energize the coil, the coil and the substrate are electrically connected. In order to connect the coil to the substrate, the coil is provided with a terminal protruding to the outside. An example of such a terminal is as follows.

  FIG. 1 is a plan view of a camera driving device disclosed in Patent Document 1. FIG. The drive device includes a base member 51 having an opening 51 a, stators 56 and 57 having coils 54 and 55 wound around bobbins 52 and 53, and a rotor 58 that rotates when the stators 56 and 57 are energized. Is installed and configured. FIG. 2 is a cross-sectional view showing a cross section at the flange portions 52a located at both ends of the bobbin 52 of the drive device shown in FIG. As shown in FIG. 2, the flange portion 52 a is provided with a terminal 59 for connecting the coil 54 constituting the stator 56 and the substrate 61 to obtain conduction. Thus, the terminal 59 is provided in a state of protruding from the coil 54 to the outside. Similarly, the flanges 53 a located at both ends of the bobbin 53 are also provided with terminals 60 protruding outward.

Japanese Patent Laid-Open No. 9-236842

  However, if a terminal having a shape protruding outside the coil as described in Patent Document 1 is provided, it is difficult to reduce the thickness of the driving device. In particular, in recent years, there has been a demand for miniaturization and thinning of the camera, and accordingly, it has been demanded that each part of the camera is miniaturized and thinned. As a matter of course, it is difficult to meet such a demand with an actuator having the above-described terminals.

  Therefore, an object of the present invention is to provide an actuator that is thinned by eliminating a terminal protruding outside.

An actuator of the present invention for achieving such an object energizes the stator, a stator having a stator core, a bobbin covering the stator core, a coil wound around the bobbin, a printed circuit board to which the stator is attached, and the stator. An actuator having a rotor that rotates by this, wherein a winding terminal portion of the coil around the bobbin is electrically connected to the printed circuit board .

  By using the actuator having such a configuration, the coil and the substrate can be conducted even if a terminal projecting to the outside is not provided, and the actuator can be formed thin. When a conventional coil is provided with a terminal, the winding direction may have to be changed when the conductor is wound around the portion where the terminal is provided, but it projects outside as in the present invention. When it is set as the structure which is not provided with a terminal, the winding direction can be made into the substantially same direction as a stator over the whole region of the said coil. Thus, by making the winding direction the same, the workability of the coil winding work is improved, and the entire process of the coil winding work can be easily mechanized.

In the actuator as described above, the stator core and the bobbin can be integrally formed by insert molding . By adopting such a configuration, the assembly process of the actuator can be simplified.

Furthermore, the actuator as described above can be configured such that a conducting wire forming the winding terminal portion is wound around a groove formed at an end portion of the bobbin . If such a groove is formed, it can be firmly wound so that the conducting wire forming the winding terminal portion cannot be broken. The groove can also function as an adhesive for fixing the winding terminal portion and the printed circuit board, or as an adhesive or a solder pool for collecting solder, improving the workability of the coil winding operation and improving the stator. It can be firmly bonded and attached onto a printed circuit board.

  Further, in the actuator as described above, the coil is formed by a conductive wire coated with an enamel resin, and the winding terminal portion is fixed to the printed circuit board with an enamel-decomposable conductive adhesive and is electrically connected. It can be formed thin. Here, the “enamel-decomposable conductive adhesive” refers to decomposing, adhering, and conducting by decomposing an enamel resin under a specific temperature condition and then promoting a polymerization reaction of the thermosetting resin. It can be performed in one step.

  According to the present invention, since the winding terminal portion around the bobbin is conductively connected to the printed circuit board, the actuator can be formed thin.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 3 is an exploded perspective view of the actuator 1 according to the first embodiment. The actuator 1 includes a stator 2, a board 3 (a flexible printed board in this embodiment) that is a printed board to which the stator 2 is attached, and a rotor 4 that is pivotally supported by a base plate (not shown). FIG. 4 is an enlarged plan view of the stator 2, and FIG. 5 is a side view of the stator 2 attached to the substrate 3. In FIG. 4, the coil 5 is indicated by a dotted line so that the configuration of the stator 2 is clear.

As shown in FIG. 4, the stator 2 includes a stator core 6, a resin bobbin 7 covering the stator core 6, and a coil 5 wound around the bobbin 7. In this embodiment, the U-shaped stator core 6 and the bobbin 7 are integrally formed by insert molding. As shown in FIG. 4, the stator 2 includes a first magnetic pole 6 a, a second magnetic pole 6 b, and a third magnetic pole 6 c that are formed by exposing the stator core 6 from the bobbin 7. The first magnetic pole 6a, the second magnetic pole 6b, and the third magnetic pole 6c are supported in the mold when the stator core 6 and the bobbin 7 are integrally formed by insert molding. It is formed by contacting the part.
The bobbin 7 is provided with an end portion 7a provided with the first magnetic pole 6a and also serving as a convex portion for preventing the coil 5 from collapsing, an end portion 7b provided with the second magnetic pole 6b and serving as the convex portion for preventing the collapse of the coil 5, and a third portion. The magnetic pole 6c is provided, and the convex part 7c which serves also as the collapse prevention convex part of the coil 5 is provided, and the coil winding part 7d.
Here, the detailed description of the integral molding of the stator core 6 and the bobbin 7 will be made in detail. First, the U-shaped stator core 6 made of a magnetic material is floated in the mold so that a space for pouring the resin constituting the bobbin 7 is formed. Store in the state where At this time, in order to support the stator core 6, a part of the stator core 6 is brought into contact with the support portion in the mold. Therefore, the stator core 6 is exposed from the bobbin 7. Therefore, if the support portion in the mold is brought into contact with the portion where the magnetic pole is to be formed and resin is poured into the mold to form the bobbin 7, the stator core 6 can be exposed from the bobbin 7 and the magnetic pole can be formed. By performing insert molding through such steps, in this embodiment, the stator core 6 and the bobbin 7 are integrally molded, and the first magnetic pole 6a, the second magnetic pole 6b, and the third magnetic pole 6c are formed as described above. Has been.

  Although the stator 2 includes the coil 5 as described above, in this embodiment, a conductive wire is wound around both sides of the U-shaped bobbin 7 and the two coils 5 are provided. That is, the stator 2 of the present embodiment has a configuration in which the two stators of the first stator 2a and the second stator 2b are combined into one. The conducting wire forming the coil 5 of the stator 2 is covered with enamel resin. Each coil 5 forms winding terminal portions 5a and 5b wound so as to be exposed at both end portions (bobbin convex portions 7a and 7b) of the first stator 2a and the second stator 2b. Such a coil 5 has a winding direction substantially the same as that of the stator 2 over the entire area including the winding terminal portion 5b from the winding terminal portion 5a. By making the winding direction substantially the same direction as the stator 2 over the entire area of the coil 5, the coil 5 can be created without changing the winding direction of the winding machine over the entire area.

  The stator 2 configured as described above is installed in a state in which the winding terminal portions 5a and 5b are brought into contact with the lands 3a and 3b on the substrate 3 so that conduction between the substrate 3 and the stator 2 is obtained. At this time, the winding terminal portions 5a and 5b and the substrate 3 are bonded and electrically connected using an enamel-decomposable conductive adhesive. The winding terminals 5a and 5b and the lands 3a and 3b may be electrically connected to each other by contact with each other as described above, or may be electrically connected via an enamel-decomposable conductive adhesive. Also good. As this enamel decomposable conductive adhesive, NT-389 manufactured by NT Success Co., Ltd. was used. The enamel-decomposable conductive adhesive is applied in a state where the enamel resin covering the conductive wire forming the coil 5 is not peeled off, and adheres the winding terminal portions 5a and 5b and the lands 3a and 3b of the substrate 3. . The enamel-decomposable conductive adhesive decomposes the enamel resin that coats the conductive wire and can bond them together with the internal metal wires exposed, so that the substrate can be used without any work other than applying the adhesive. 3 and the stator 2 can be electrically connected.

  The actuator 1 configured as described above can rotate the rotor 4 by energizing the coil 5 through the substrate 3.

  Next, a second embodiment of the present invention will be described with reference to FIG. The actuator 21 of the second embodiment differs from the actuator 1 of the first embodiment in that the actuator 21 of the second embodiment has a groove 22 formed in the bobbin 7 that is not formed by the actuator 1 of the first embodiment. . In other respects, the actuator 1 of the first embodiment and the actuator 21 of the second embodiment have the same configuration. Therefore, for convenience of explanation, the winding terminal portions 5 a and 5 b are omitted in FIG. 6, but the actuator 21 of the second embodiment also includes the winding terminal portions 5 a and 5 b as with the actuator 1 of the first embodiment. Yes.

  The groove | channel 22 in a present Example is a groove | channel for entanglement with the conducting wire which mainly forms winding terminal part 5a, 5b. If the conducting wire is entangled in such a groove 22 and wound, the breaking of the conducting wire can be prevented.

  Further, as shown in FIG. 6, the groove 22 is formed with an adhesive material reservoir 22 a that is deeply cut on the side to be brought into contact with the substrate 3. By forming such an adhesive reservoir 22a, the bonding between the winding terminal portions 5a and 5b using the enamel-decomposable conductive adhesive and the lands 3a and 3b of the substrate 3 is offset and reliable. The bonding workability can be greatly improved.

  In the description of the second embodiment, the same reference numerals are used for the same components as those of the actuator 1 of the first embodiment.

  In order to attach the stator 2 having the configuration of Example 1 or 2 to the substrate 3, as shown in FIG. 7, it is preferable to attach a plurality of substrates 3 to a single sheet 33. A plurality of substrates 3 are integrally provided on the sheet 33 via legs 33a. The substrate 3 is separated from the sheet 33 by the holes 33b except for the legs 33a. For this reason, the substrate 3 is separated from the sheet 33 when the leg portion 33a is cut off. An enamel-decomposable electrode adhesive is applied in advance to each substrate 3 of the sheet 33 at a predetermined position, and the stator 2 is mounted thereon, and a plurality of stators 2 are attached to the substrate 3 at a time. Thereafter, the legs 33a may be separated from the sheet 33 and the respective substrates 3 may be taken out.

The above-described embodiments are merely examples for carrying out the present invention, and the present invention is not limited thereto. Various modifications of these embodiments are within the scope of the present invention. It is apparent from the above description that various other embodiments are possible within the scope. For example, although the board | substrate 3 and the coil 5 were fixed with the enamel decomposable electrode adhesive, you may fix with not only this but a solder or an enamel decomposing solder. When these solders are used, it is preferable to provide the adhesive reservoir 22a as in the second embodiment. This is because the wettability is improved because the tip of the soldering iron is inserted into the solder.
The removal of the enamel-based resin is not limited to the enamel-decomposable adhesive or the enamel-decomposable solder, but may be removed with a heat source such as laser irradiation or a heater, or may be rubbed with a cutter or the like.
Moreover, the stator 2 and the board | substrate 3 do not necessarily need to adhere | attach with an adhesive agent etc., and winding terminal part 5a, 5b and land 3a, 3b should just be conduct | electrically_connected.

10 is a plan view of a conventional camera driving device disclosed in Patent Document 1. FIG. It is sectional drawing made into the cross section by the collar part located in the both ends of the bobbin of the drive device shown in FIG. FIG. 3 is an exploded perspective view of the actuator according to the first embodiment. FIG. 4 is an enlarged plan view of the stator shown in FIG. 3. It is a side view of the state which attached the stator to the printed circuit board. It is an actuator of Example 2, Comprising: It is the perspective view which abbreviate | omitted the conducting wire of the winding terminal part. It is an example when attaching a stator to a printed circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 21 Actuator 2 Stator 2a 1st stator 2b 2nd stator 3 Board | substrate 3a, 3b Land 4 Rotor 5 Coil 5a, 5b Winding terminal part 6 Stator core 6a 1st magnetic pole 6b 2nd magnetic pole 6c 3rd magnetic pole 7 Bobbin 22 Groove 22a Adhesive pool

Claims (3)

An actuator having a stator core, a stator having a bobbin covering the stator core, a coil wound around the bobbin, a printed circuit board to which the stator is attached, and a rotor that rotates by energizing the stator. ,
A winding terminal portion of the coil to the bobbin is electrically connected to the printed circuit board ,
An actuator, wherein a conducting wire forming the winding terminal portion is wound around a groove formed at an end portion of the bobbin. The actuator according to claim 1, wherein
The actuator, wherein the stator core and the bobbin are integrally formed by insert molding. 3. The actuator according to claim 1 , wherein the coil is formed of a conductive wire coated with an enamel resin, and the winding terminal portion is fixed to the printed circuit board with an enamel-decomposable conductive adhesive. An actuator characterized by conducting connection.

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