JP4620575B2 - Motor and electronic device incorporating the same - Google Patents

Description

  The present invention relates to a small motor. More specifically, the present invention relates to a motor suitable for use in a small electronic device such as a digital camera or a mobile phone.

  In recent years, downsizing of all electronic devices has been promoted. For example, mobile phones are being further miniaturized and increased in density, while cameras are standard equipment. In addition, many cameras are provided with a zoom function. Therefore, there is a demand for further miniaturization of motors that are incorporated in small electronic devices.

  For example, Patent Document 1 discloses a light amount adjustment device for a camera incorporating a motor. The motor part incorporated in this apparatus includes a rotor magnet magnetized with two poles, a stator with the stator pole facing the outer periphery of the rotor magnet, and a coil for generating a magnetic pole in the stator. . In particular, the motor portion of this device is thinned by bringing a coil wound around the stator to one arm, and the rotation center of the rotor is decentered with respect to the center of the stator, thereby reducing the outer diameter of the lens unit. The miniaturization is achieved by adopting a structure that is devised so as not to protrude.

JP 7-234435 A

  Patent Document 1 shows that a stator shape, which has conventionally been a U-shape or C-shape as a standard shape, is deformed to reduce the size of a motor. However, since the motor disclosed in Patent Document 1 is provided by inserting the coil into the stator, the shape of the arm portion on which the coil is provided is a shape close to that of the conventional type although it is deformed from the conventional stator shape.

  However, as electronic devices are further downsized in the future, it is expected that not only the space (space) that can be secured for motor arrangement will be reduced, but also the shapes thereof will be diversified. In order to cope with this, it is required to make the stator bend in a complicated shape. However, since the conventional method cannot provide a coil on the stator having a complicated shape, there is a limit to downsizing the motor. It is coming.

  Therefore, an object of the present invention is to provide a motor that can cope with a case where the stator shape is complicated depending on the arrangement space.

  The object is to form a coil for exciting the stator by arranging a plurality of coil units provided with coils and having connection terminals on the stator, and electrically connecting each of the plurality of coil units in series. This is achieved by a motor characterized by being. In this motor, one coil for exciting the stator is formed by continuously arranging small coil units and electrically connecting them in series. Since each of the coil units is small, even if the stator shape is a complicated shape including a large number of curved portions, it can be easily fed. Therefore, the motor can be further reduced in size.

  The plurality of coil units can be electrically connected in series via a wiring board. Moreover, it is preferable that the said coil unit is fitted to the said stator and the inner surface of the said divided coil unit which contacts the said stator is formed in circular arc shape.

  Therefore, if it is an electronic device incorporating the above motor, further miniaturization can be achieved. In addition, if a positioning part for positioning the coil unit is formed on the substrate of the electronic device, the coil unit can be positioned, and the position can be stably maintained, so that it is easier to connect the terminals and a more preferable structure. It becomes.

  According to the present invention, even when the stator shape becomes complicated depending on the arrangement space, it is possible to cope with this, and thus a motor that promotes miniaturization is provided.

  Hereinafter, a small motor of an embodiment will be described with reference to the drawings. FIG. 1 is a diagram schematically illustrating a shutter device for a camera incorporating a motor (hereinafter, simply referred to as a motor) that promotes miniaturization according to an embodiment. 1A is a plan view of the shutter device, and FIG. 1B is a bottom view thereof.

  The shutter device 1 includes a substrate 2 having an opening 2a, two shutter blades 3 and 4 for opening and closing the opening 2a, and a motor 10 for driving the shutter blades 3 and 4.

  The motor 10 includes a stator 11, a coil 12, and a rotor 13, and is fixed to the substrate 2. Shutter blades 3 are fixed to the rotor 13 with an adhesive or the like so that the shutter blades 3 can swing following the rotation of the rotor 13. The rotation center axis 13 a of the rotor 13 is also the rotation center axis of the shutter blade 3. Further, the shutter blade 3 is formed with a drive pin 3 a for driving the other shutter blade 4. The shutter blade 4 is rotatably disposed on a support shaft 5 erected on the substrate 2. Therefore, in the shutter device 1, when the motor 10 is driven and the rotor 13 is rotated, the shutter blade 3 swings, and the shutter blade 4 is driven accordingly, so that the opening 2a can be opened and closed.

  Now, the shutter device 1 is promoted to be miniaturized, the space in which the motor 10 can be placed is limited, and the stator 11 has a special shape with a large number of bends compared to a U-shape or the like that is generally used in the past. It has become. In FIG. 1A, the portion behind the other members is indicated by a dotted line so that the overall shape of the stator 11 can be confirmed.

  As can be seen in FIG. 1A, the coil 12 set on the stator 11 is divided into a plurality (two in this embodiment, 12-1 and 12-2). Such small coils are electrically connected to each other so as to function as a single coil. The divided coil unit U-1 has a configuration in which a coil 12-1 and connection terminals Ta and Tb are provided on a coil bobbin 12a. The divided coil unit U-2 has the same configuration, and the coil bobbin 12b is provided with the coil 12-2 and connection terminals Ta and Tb. When the terminal Ta of the split coil unit U-1 and the terminal Tb of the split coil unit U-2 are electrically connected, the split coil units U-1 and U-2 are electrically connected in series. The terminal Tb of the split coil unit U-1 and the terminal Ta of the split coil unit U-2 are connected to the power source. Since each of the divided coil units U-1 and U-2 is formed to be narrow and small on the coil winding axis side, the bent portion of the stator 11 extends from the tip where the magnetic pole is formed to the back side. Can be sent in easily. The state of FIG. 1 is formed by sending the divided coil units 12-1 and 12-2 to the stator 11 one by one in order.

  In the bottom view shown in FIG. 1 (B), a notch portion 6 for receiving the split coil units U-1 and U-2 is provided on the substrate 2, and the split coil units U-1 and U-2 are provided using the notch portion 6 as a positioning portion. The structural example which positioned is shown. By adopting such a structure, it is possible to accurately position the divided coil units U-1 and U-2, and it is possible to prevent positional deviation after the divided coil units are arranged.

  Each of the divided coil units U-1 and U-2 is provided with terminals Ta and Tb on both sides, and each is an independent small coil unit. The terminals Ta of the adjacent split coil unit U-1 and the terminal Tb of the split coil unit U-2 are electrically connected in series to be integrated as one coil. Then, the terminals Ta of the split coil unit U-2 at the left and right ends and the terminal Tb of the split coil unit U-1 are entirely excited by connecting them to an external power source.

  In FIG. 2, an FPC (Flexible Printed Circuit) 20 is disposed as a wiring board on the back side of the substrate 2, and the divided coil units U- 1 and U- 2 are electrically connected in series using the FPC 20. 2 shows an example of a structure for connecting to an external power source. A terminal 21 of the split coil unit U-1 and a terminal Tb of the split coil unit U-2 are electrically connected by soldering at a land 21 provided in the FPC 20. The terminal Tb of the split coil unit U-1 and the terminal Ta of the split coil unit U-2 are connected to an external power source (not shown) by wirings 22 and 23 provided in the FPC 20.

  The motor 10 according to the embodiment described above is basically composed of coil units U-1 and U-2 in which a single coil having a certain size or more is divided into a plurality of small parts. If the divided coil unit is formed to be small, even a complicated shape in which the shape of the stator 11 includes many curved portions can be easily fed into the back side of the stator 11. Therefore, a small motor that can be applied to a limited space can be easily manufactured. Further, since it is sufficient to connect a necessary number of divided coil units to obtain a desired magnetic flux, it is not necessary to design and prepare a plurality of types of motors, so that the manufacturing cost can be reduced. If the electronic device is small, such as a shutter device employing such a motor, further miniaturization can be promoted.

  FIG. 3 is a diagram showing a structural example of the split coil unit. FIG. 3 exemplarily shows the split coil unit U-1. (A) shows a case where the inner surface FS of the through passage formed so as to be fitted to the stator 11 is planar, and (B) shows a case where the inner surface CS of the through passage fitted to the stator 11 is an arc. Show. If it forms in circular arc shape as shown to (B), after fitting the division | segmentation coil unit U-1 to the stator 11, since a contact area is small, it can be moved smoothly. Therefore, it becomes a more preferable split coil unit with good workability.

  In the embodiment described above, the case where the motor 10 is incorporated in the shutter device has been described. However, the shutter device 1 is merely an example of an electronic device. It goes without saying that the present invention can be applied to various electronic devices whose size reduction is promoted. Such an electronic device can be further reduced in size.

  The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the specific embodiment, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible.

It is the figure which showed typically the shutter apparatus for cameras incorporating the small motor of an Example, (A) is a top view of a shutter apparatus, (B) is a bottom view. 5 is a view showing a structural example when an FPC is arranged on the back side of the base 2. FIG. It is the figure shown about the structural example of the division | segmentation coil unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shutter apparatus 2 Board | substrate 3, 4 Shutter blade 6 Notch part 10 Small motor 11 Stator 12 (12-1, 12-2) Coil U-1, U-2 Divided coil unit 13 Rotor 20 FPC (wiring board)
Ta, Tb terminals

Claims (4)

  A first coil unit including a first coil, a first coil bobbin provided with the first coil and having first and second terminal portions for connection of the first coil;
  A second coil unit including a second coil, a second coil bobbin provided with the second coil and having third and fourth terminal portions for connecting the second coil;
  A stator to which the first and second coil units are connected;
  A rotor rotated by the stator,
The first and second coils are electrically connected in series via a wiring board,
  The second and third terminal portions are adjacent to each other;
  The wiring board includes a first wiring connected to the first terminal portion, a second wiring connected to the fourth terminal portion, and a land for connecting the second and third terminal portions,
  The stator includes first and second arm portions that face each other and sandwich the rotor at the tip,
  The first and second coil units are attached to the first arm part,
  The first to fourth terminal portions are not provided between the first and second arm portions, but are provided outside the first arm portion, and overlap the stator in the axial direction of the rotor. It is provided at a position that does not become
  The electric current flows in the order of the first wiring, the first coil, the land, the second coil, and the second wiring.   The first coil bobbin is fitted to the stator and has an arc-shaped first inner surface that comes into contact with the stator,
  2. The motor according to claim 1, wherein the second coil bobbin is fitted to the stator and has an arc-shaped second inner surface that comes into contact with the stator. An electronic apparatus comprising the motor according to claim 1 or 2 incorporated therein. The electronic device according to claim 3 , wherein a positioning portion for positioning the first and second coil units is formed on a substrate of the electronic device.

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