JP4572070B2 - Sector drive device - Google Patents

Description

  The present invention relates to a small sector drive device.

  2. Description of the Related Art Conventionally, a sector drive device built in a camera has been proposed in which a shutter is opened and closed by rotating a rotor under the action of a magnet magnetized by energization of a coil. In recent years, electronic devices such as mobile phones and notebook computers equipped with a minute camera have been widely provided. There is a great demand for miniaturization of these electronic devices, and the sector drive device is also required to be miniaturized. In such sector drive devices, various proposals have been made regarding the arrangement of coils, yokes and rotors.

  Next, a conventional sector drive device will be described. The shutter device described in Patent Document 1 includes a shutter blade, a rotor, a yoke having first to fourth yoke members, and a coil arranged so as to sandwich the rotor, and energizes the coil to rotate the rotor. The shutter blades are opened and closed.

JP 2002-303914 A

  However, when the sector drive device is applied to a small electronic device, the sector drive device also needs to be miniaturized. However, in the arrangement of the shutter device described in Patent Document 1, the coil is arranged so as to sandwich the rotor. Therefore, there is a problem that the space on the substrate cannot be effectively used.

  Therefore, the present invention has been made to solve these problems, and an object thereof is to provide a sector drive device that can effectively use the space on the substrate.

  In order to solve the above problems, a sector drive device according to the present invention is arranged on a substrate having an opening, a sector having a variable opening diameter, and the substrate. A sector drive device comprising: a rotor that opens and closes the shutter blades; a stator that is disposed around the rotor and that provides a rotational force to the rotor; and a plurality of coils that excites the stator by a predetermined drive current The substrate is formed in a polygonal shape, and the coils are arranged at corners of the substrate.

  According to the first aspect of the present invention, since the coils can be arranged efficiently, the space on the substrate can be used effectively. Further, since the substrate is formed in a polygon, the sector drive device also has a polygon, and positioning is easy with reference to one side of the substrate. Even when the sector drive device is downsized, positioning can be performed with high accuracy.

  According to a second aspect of the present invention, in the sector drive device according to the first aspect, the stator includes a winding portion that winds the coil. According to invention of Claim 2, since the stator is provided with the winding part for winding a coil, and the coil is wound directly, compared with the case where a coil is arranged using a bobbin etc., Since the coils can be arranged efficiently, the space on the substrate can be used effectively.

  According to a third aspect of the present invention, in the sector drive device according to the first or second aspect, the stator includes a first stator and a second stator.

  According to a fourth aspect of the present invention, in the sector drive device according to the third aspect, the first stator and the second stator have the same shape. According to the invention of claim 4, the number of manufactured parts can be reduced.

  According to a fifth aspect of the present invention, in the sector drive device according to any one of the first to fourth aspects, the substrate includes a lens barrel that supports a lens. Features. According to the invention described in claim 5, since the substrate includes the lens barrel that supports the lens, a small sector drive device can be provided.

  ADVANTAGE OF THE INVENTION According to this invention, the sector drive device which can utilize effectively the space on a board | substrate can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 is an exploded perspective view of the image pickup apparatus according to the first embodiment. FIG. 2 is an exploded perspective view of the shutter device as the sector drive device according to the first embodiment. FIG. 3 is an exploded perspective view of the shutter device with the second substrate removed. As shown in FIGS. 1 to 3, the imaging apparatus 1 includes a wiring board 2, an imaging element 3, a low-pass filter 4, a first lens 5, a second lens 6, a first board 7, and a first stator 8. , Second stator 9, guide shaft 10, washer 11, rotor 12, drive lever 13, sector 14, second substrate 15, and rotor shaft 16.

  As indicated by a two-dot chain line in FIG. 2, the first stator 8, the second stator 9, the rotor 12, and the like are between the first substrate 7 and the second substrate 15, and the guide shaft 10 or the rotor shaft 16. Is arranged through. The shutter device includes a first substrate 7, a first stator 8, a second stator 9, a guide shaft 10, a washer 11, a rotor 12, a drive lever 13, a sector 14, a second substrate 15, and a rotor shaft 16. Consists of.

  The wiring board 2 is composed of, for example, a flexible wiring board, and a predetermined wiring pattern is formed on the surface thereof, and the imaging element 3 is fixed. The image pickup device 3 is composed of a CCD, for example, and is fixed on the wiring board 2. The low-pass filter 4 is incorporated in the front surface of the image sensor 3 and removes a high frequency component and passes only a low frequency component. The low-pass filter 4 suppresses the generation of moire and false colors. The first lens 5 and the second lens 6 are held in the first substrate 7.

  The first substrate 7 is formed in a polygonal shape (in the present embodiment, substantially rectangular), and serves as a base for supporting each component member so as to perform its function. The first substrate 7 is provided at the center, is provided at a position corresponding to the opening 7a through which the photographing light beam passes, and the opening 7a, and a lens barrel for supporting the first lens 5 and the second lens 6. 7b, convex portions 7c to 7i that engage with the second substrate 15, projections 7j1 to 7j3 for engaging with the second substrate 15, holes 7k into which the guide shaft 10 is inserted, the second substrate 15 It has a convex portion 7l that fits into the hole portion and functions as a positioning member, and positioning projections 7m to 7p. The first substrate 7 includes a lens barrel 7b that supports a lens, and the lens barrel and the shutter substrate are shared.

  Similar to the first substrate 7, the second substrate 15 is formed in a polygonal shape. The second substrate 15 is provided in the engaging portions 15 a to 15 c that engage with the first substrate 7 and the engaging portions 15 a to 15 c, and engages with the protrusions 7 j 1 to 7 j 3 of the first substrate 7. An engagement groove 15d, an opening 15e provided in the center, through which a photographic light beam passes, a hole 15f into which a part of the guide shaft 10 is inserted, a hole 15g into which a part of the drive lever 13 is inserted, a first substrate 7 has a hole 15h into which the convex portion 71 is fitted. In addition, since the 1st board | substrate 7 and the 2nd board | substrate 15 should just be a polygon, they may be a rectangle. The first substrate 7 and / or the second substrate 15 corresponds to the substrate in the claims.

  A first stator 8, a second stator 9, and a rotor 12 are provided on the front surface of the first substrate 7. The rotor 12 opens and closes the sector 14 and has a cylindrical shape as a whole. A part of the rotor 12 is formed of a permanent magnet and is magnetized in two directions in the circumferential direction. For this reason, the rotor 12 has an N pole and an S pole on the peripheral wall. The rotor 12 has a hole 12a formed in the inner diameter portion thereof and into which the rotor shaft 16 is fitted.

  The drive lever 13 is fixed to the rotor 12 and rotates together with the rotor 12. The drive lever 13 is a first fitting portion 13 a and a second fitting portion 13 b that are fitted into the sector 14. It has a hole 13 c formed on the inner diameter of the portion 13 a and formed corresponding to the hole 12 a of the rotor 12.

  The sector 14 is a sector in which the opening diameter of the opening through which the light beam passes is variable, and the first hole portion 14 a into which the first fitting portion 13 a of the drive lever 13 is fitted, and the second hole of the drive lever 13. It has the 2nd hole 14b by which the fitting part 13b is fitted. The sector 14 is configured to rotate integrally with the rotor 12 when the rotor 12 rotates.

  The first stator 8 and the second stator 9 are disposed around the rotor 12 and are used to give a rotational force to the roller 12. The coils 17 and 18 are partially wound around the rotor 12. And assembled to the first substrate 7. The first stator 8 includes an arm portion 8a, a coil winding portion 8b provided in a part of the arm portion 8a, bent in the rotor axial direction, a magnetic pole portion 8c formed in a portion close to the rotor 12, and a magnetic pole. A hole 8d formed at the opposite end of the part 8c and concave portions 8e and 8f for positioning between the first substrate 7 and the coil winding portion 8b include a predetermined number of coils 17. It is wound.

  The second stator 9 includes an arm portion 9a, a coil winding portion 9b which is provided in a part of the arm portion 9a and is bent in the rotor axial direction, a magnetic pole portion 9c formed in a portion close to the roller 12, and a magnetic pole A hole 9d formed on the opposite end of the portion 9c and concave portions 9e and 9f for positioning between the first substrate 7 and the coil winding portion 9b include a predetermined number of coils 18. It is wound. These coil winding parts 8b and 9b are formed by bending. The pair of coils 17 and 18 excites the first stator 8 and the second stator 9 with a predetermined drive current. The rotor 12 of this embodiment swings within a predetermined angle when the coils 17 and 18 are energized, and even one coil can drive the rotor 12, but it is divided into two locations in order to reduce the size of the coil. Provided. For this reason, the coils 17 and 18 are electrically connected in series.

  The convex portion 10b of the guide shaft 10 is fitted into the hole portion 15f of the second substrate 15, and the convex portion 10a of the guide shaft 10 is fitted into each of the hole portions 8d and 9d. The second stator 9 is rotatably supported. 1 and 3 show a state in which the coils 17 and 18 are wound around the coil winding portions 8b and 9b of the first stator 8 and the second stator 9, and FIG. 2 shows a coil winding portion. The state where the coils 17 and 18 are not wound around 8b and 9b is shown.

  The first stator 8 and the second stator 9 are easily magnetized by a magnetic field applied from the outside, such as soft iron, and if the polarity of the external magnetic field is reversed, the magnetization of this material is also rapidly reversed. It is made of a soft magnetic material that exhibits magnetic properties. A first coil 17 and a second coil 18 are disposed at corners adjacent to the corner where the rotor 12 is disposed so as to sandwich the rotor 12. That is, the coils 17 and 18 are arranged on the diagonal line of the substrate 7. A magnetic circuit is formed by the first stator 8, the second stator 9 and the rotor 12.

  In this shutter device, the magnetic flux generated by the first coil 17 and the second coil 18 is guided to the portion close to the rotor 12 via the arm portions 8 a and 9 a of the first stator 8 and the second stator 9. Therefore, magnetic loss is small and a large driving force is applied to the rotor 12.

  FIG. 4 is a front view of the imaging apparatus according to the first embodiment. In FIG. 4, reference numeral 3 denotes an image sensor, 7j1 to 7j3 are protrusions provided on the first substrate 7, 15 is a second substrate, 15a to 15c are engaging portions provided on the second substrate 15, and 15e. Is an opening, 15f, 15g and 15h are holes, and 17 and 18 are coils. Thus, the first substrate 7 and the second substrate 15 are formed in a polygonal shape, and the coils 17 and 18 are arranged at the corners of the first substrate 7 and the second substrate 15. The coils 17 and 18 can be arranged efficiently. Therefore, the space on the substrate in the first substrate 7 and the second substrate 15 can be used effectively.

  5 is a cross-sectional view taken along the line AA of the imaging apparatus shown in FIG. In FIG. 5, reference numeral 2 is a substrate, 3 is an image sensor, 4 is a low-pass filter, 5 is a first lens, 6 is a second lens, 7 is a first substrate, 7b is a lens barrel, and 8 is a first lens. , 9 is a second stator, 15 is a second substrate, and 17 and 18 are coils. The coils 17 and 18 are arranged at diagonal positions of the first substrate 7 and the second substrate 15.

  The 1st stator 8 and the 2nd stator 9 are comprised using the stator of the same shape. For this reason, the coil winding portion 8b of the first stator 8 is on the upper side, whereas the second stator 9 is assembled with the stator having the same shape as the first stator 8 turned upside down. The coil winding portion 9b is disposed on the lower side. As described above, in the present embodiment, the first stator 8 and the second stator 9 use the same shaped stator, and therefore the number of manufactured parts can be reduced. Since the first substrate 7 includes the lens barrel 7b that supports the first lens 5 and the second lens 6, a small shutter device can be provided.

  FIG. 6 is a cross-sectional view of a state where the second substrate shown in FIG. 2 is removed. In FIG. 6, reference numeral 7 is a first substrate, 7a is an opening, 7c to 7i are projections, 7j1 to 7j3 are projections, 7l projections, positioning projections 7m to 7p, 8 is a first stator, 8a is an arm portion of the first stator 8, 8b is a coil winding portion, 8e and 8f are concave portions, 9 is a second stator, 9a is an arm portion provided on the second stator 9, and 9b is coil winding. , 9e and 9f are recesses, 10 is a guide shaft, 12 is a rotor, and 17 and 18 are coils.

  Since the first substrate 7 is formed in a polygonal shape and the coils 17 and 18 are arranged at diagonal positions of the first substrate 7, the coils can be arranged efficiently. The upper space can be used effectively. Since the first stator 8 and the second stator 9 have winding portions for winding the coils 17 and 18, for example, the coils can be arranged more efficiently than in the case of using a bobbin. The space on one substrate 7 can be used effectively.

  Next, the operation of the image pickup apparatus 1 according to the first embodiment will be described. 7A and 7B are timing charts of the image pickup apparatus 1 according to the first embodiment. FIG. 7A is a diagram showing the on / off state of the CCD 3, and FIG. 7B is a diagram showing the open / closed state of the sector 14. (C) is a diagram showing an on / off state of the drive circuit. As shown in FIG. 7A, the CCD 3 is in an on state during a period from T1 to T5.

In this state, when a drive circuit (not shown) energizes the first coil 17 and the second coil 18 during a period from T2 to T6, the first coil 17 and the second coil 18 generate a predetermined magnetic flux. The generated magnetic flux passes through the arm portions 8a and 9b of the first stator 8 and the second stator 9 and is guided to the rotor 12 to generate a magnetic rotational force in the rotor 12, and during a period from T3 to T7. The sector 14 is driven open.
Thereby, the CCD 3 can read data during the period from T4 to T5.

  Next, a second embodiment will be described. FIG. 8 is an exploded perspective view of the image pickup apparatus according to the second embodiment. As shown in FIG. 8, the imaging apparatus 200 includes a wiring board 2, an imaging element 3, a low-pass filter 4, a first lens 5, a second lens 6, a first board 207, a first stator 8, a second stator 8. The stator 9, the guide shaft 10, the rotor 12, the drive lever 13, the sector 14, the second substrate 215, and the rotor shaft 16. In addition, about the location already demonstrated in 1st Example, the same code | symbol is attached | subjected and the description is abbreviate | omitted. Further, unlike the first embodiment, the imaging device 20 according to the second embodiment is configured such that the first lens 5 and the second lens 6 are mounted on the second substrate 215. The structures of the substrate 207 and the second substrate 215 are different.

  The first substrate 207 is formed in a polygonal shape (in the present embodiment, substantially rectangular), and serves as a base for supporting each component member so as to perform its function. The first substrate 7 is provided in the center, and is formed in an opening 207a through which a photographic light beam passes, engaging portions 207b to 207d that engage with the second substrate 215, and engaging portions 207a to 207d, and the second substrate It has an engagement groove 207e into which the engagement projection of 215 is engaged, a hole 207f into which a part of the drive lever 13 is inserted, and a hole 207g into which the convex part of the second substrate 215 is fitted.

  The second substrate 215 is formed in a polygonal shape, and includes engaging portions 215a to 215c that engage with the first substrate 207, an opening 215d through which the imaging light beam passes, and an engagement groove 207e of the second substrate 207. It has an engaging protrusion 215e to be engaged. The rotor 12 is held between the first substrate 207 and the second substrate 215 via the drive lever 13, the sector 14, and the rotor shaft 16. The first stator 8 and the second stator 9 are held between the first substrate 207 and the second substrate 215 via the guide shaft 10. The first stator 8 is provided with a coil winding portion 8b bent in the rotor axial direction, and the second stator 9 is provided with a coil winding portion 9b bent in the rotor axial direction.

  With the above configuration, when a drive circuit (not shown) energizes the first coil 17 and the second coil 18, the first coil 17 and the second coil 18 generate a predetermined magnetic flux. The generated magnetic flux passes through the arm portions 8a and 9b of the first stator 8 and the second stator 9 and is guided to the rotor 12 to generate a magnetic rotational force in the rotor 12, and the sector 14 is driven to open. Is done. As a result, the CCD 3 can read data.

  FIG. 9 is a cross-sectional view of the imaging apparatus according to the second embodiment. In FIG. 9, reference numeral 2 is a substrate, 3 is an image sensor, 4 is a low-pass filter, 5 is a first lens, 6 is a second lens, 207 is a first substrate, 8 is a first stator, and 9 is a first lens. Reference numeral 2 denotes a stator, 215 denotes a second substrate, 215d denotes an opening, 215e denotes a lens barrel, and 17 and 18 denote coils. The coils 17 and 18 are arranged at diagonal positions of the first substrate 207 and the second substrate 215.

  The 1st stator 8 and the 2nd stator 9 are comprised using the stator of the same shape. For this reason, while the coil winding part 8b of the first stator 8 is on the upper side, the second stator 9 is assembled with the stator having the same shape as the first stator 8 turned upside down. The coil winding portion 9b is disposed on the lower side. As described above, in the present embodiment, the first stator 8 and the second stator 9 are the same shaped stator, so the number of manufactured parts can be reduced. Since the first substrate 7 includes the lens barrel 215e that supports the first lens 5 and the second lens 6, a small imaging device can be provided.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications can be made within the scope of the gist of the present invention described in the claims.・ Change is possible. For example, in each of the embodiments described above, the swing motor has been described as an example. However, the present invention is not limited to this, and for example, a step motor may be used. Further, the arrangement of the coils is not limited to the diagonal position, and may be arranged at adjacent corners. Moreover, although the lens barrel and the motor substrate are integrated, the motor substrate and the lens barrel may be separate members. Further, although the shutter device has been described, the present invention is not limited thereto, and an aperture device may be used. Further, an IR cut filter may be used instead of the low pass filter. Moreover, although the stator is composed of two members, the first stator and the second stator, it may be composed of a single member or three or more members. Moreover, the configuration is not limited to a case where a pair of coils is provided, and a configuration in which a plurality of coils are provided may be used, and three or more coils may be provided.

1 is an exploded perspective view of an image pickup apparatus according to a first embodiment. It is a disassembled perspective view of the shutter device according to the first embodiment. It is a disassembled perspective view of the shutter apparatus of the state which removed the 2nd board | substrate. It is a front view of the imaging device concerning the 1st example. It is AA sectional drawing of the imaging device shown in FIG. It is sectional drawing of the state which removed the 2nd board | substrate shown in FIG. 3 is a timing chart of the imaging apparatus according to the first example. It is a disassembled perspective view of the imaging device which concerns on 2nd Example. It is sectional drawing of the imaging device which concerns on 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image pick-up device 2 Wiring board 3 Image pick-up element 4 Low pass filter 5 1st lens 6 2nd lens 7,207 1st board | substrate 8 1st stator 9 2nd stator 10 Guide shaft 11 Washer 12 Rotor 13 Drive lever 14 Sector 15, 215 Second substrate 16 Rotor shaft

Claims (3)

A substrate provided with an opening, a sector that makes the opening diameter of the opening variable, a rotor that is disposed on the substrate and that opens and closes the sector, and that is disposed around the rotor, and has a rotational force with respect to the rotor In a sector drive device comprising a stator for providing a plurality of coils for exciting the stator by a predetermined drive current,
The substrate is formed in a polygon,
Each coil is disposed at a corner of the substrate,
The rotor is disposed at a corner of the substrate where the coil is not disposed,
The stator is provided along the entire outer periphery of the substrate, and includes first and second stators,
The first and second stators partially overlap each other, and are fixed to the substrate by a single guide shaft that passes through the overlapped part,
The plurality of coils include first and second coils wound around the first and second stators, respectively.
The sector drive device characterized in that the first and second stators have the same shape . 2. The sector drive device according to claim 1 , wherein the first and second stators include first and second winding portions for winding the first and second coils, respectively . 3. The sector drive device according to claim 1 , wherein the substrate includes a lens barrel that supports a lens.

Images