JP4347213B2 - Sector drive device - Google Patents

Description

  The present invention relates to a sector drive apparatus suitable for a camera.

  Conventionally, a sector drive device for a camera that opens and closes a shutter opening generally drives a sector by an actuator. Such an actuator is rotated by energizing the coil with a stator having a coil. It has a moving rotor. When the camera sector is composed of two sectors, the first sector is directly driven by the rotor to swing it, and one of the second sectors is engaged with an engaging pin provided in the first sector. There is a structure in which a groove is provided and the second sector is swung by engaging both.

A camera sector drive device having such a configuration is also described in Japanese Patent Application Laid-Open No. H10-228707. Here, in the camera sector drive device described in Patent Document 1, a cylindrical permanent magnet corresponding to a rotor is fixed to a sector (shutter blade) with an adhesive.

Japanese Utility Model Publication No. 3-108209

  However, in Patent Document 1, the rotor and the sector are fixed with an adhesive, which causes the sector to fall off the rotor.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sector drive device that securely holds a sector without dropping from the rotor.

  In order to achieve the above object, a sector drive device of the present invention includes a sector, a stator around which a coil is wound, a rotor that rotates around a support shaft, and an attachment member that attaches the sector to the rotor. In the above-mentioned sector drive device, the mounting member protrudes radially outward and outward from each of a cylindrical bearing portion fitted into the support shaft and both ends of the bearing portion. Including a collar part and a second collar part, the first collar part and the second collar part sandwich the rotor and the sector (Claim 1).

  According to the present invention, the rotor and the sector can be held between the first collar portion and the second collar portion of the mounting member. Therefore, the sector is securely held without dropping from the rotor.

  In such a sector drive device, the attachment member may further include a third collar portion between the sector and the rotor (claim 2). The sector is held without dropping from the rotor as compared with the sector drive device according to the first aspect.

  The sector drive device according to claim 1 or 2, wherein the rotor and the sector are insert products, and the mounting member is formed by insert molding. (Claim 3). By integrally molding, the sector can be securely held without dropping from the rotor.

  ADVANTAGE OF THE INVENTION According to this invention, the sector drive device by which a sector is hold | maintained reliably, without falling off from a rotor can be provided.

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

  1 and 2 are plan views of the sector drive device 1 according to the first embodiment. FIG. 1 shows a fully opened state of the shutter opening 2 a provided on the substrate 2. FIG. 2 shows a fully closed state of the shutter opening 2 a provided on the substrate 2. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

  The sector drive device 1 includes a substrate 2 provided with a shutter opening 2a, a first support shaft 2b, and a second support shaft 2c. The sector drive device 1 further includes a stator 3 around which a coil 3 a is wound, a rotor 4, a mounting member 10 (see FIG. 3), a first sector 5, and a second sector 6. The first sector 5 is provided with a shaft hole for passing the first support shaft 2b. In addition, a holding plate for preventing the first and second sectors 5 and 6 and the stator 3 from falling off is provided at a position facing the side where the sector of the substrate 2 is located, but is omitted in the drawing.

As shown in FIG. 3, the board | substrate 2 becomes concave shape around the 2nd spindle 2b, and the space 11 of a rectangular parallelepiped is formed. An escape hole 11 a is formed in the concave surface portion of the substrate 2 to allow a part of the coil 3 a included in the stator 3 to escape. The first support shaft 2 b is formed on the concave surface of the substrate 2. The stator 3, the rotor 4, the first sector 5, and the second sector 6 are assembled on the substrate 2 as described above.

As shown in FIG. 3, the attachment member 10 includes a bearing portion 9, a first collar portion 9a, and a second collar portion 9b. The bearing portion 9 has a cylindrical shape interposed between the first support shaft 2 b and the rotor 4. The first collar portion 9 a protrudes outward from the upper end of the mounting member 10, and is formed so as to cover the periphery of the upper surface of the shaft hole provided in the first sector 5 in a ring shape. The 2nd collar part 9b protrudes outside from the lower end of the attachment member 10, and is formed so that the bottom face of the rotor 4 may be covered in a ring shape. Therefore, the rotor 4 and the first sector 5 are sandwiched between the first collar portion 9a and the second collar portion 9b. Thus, the first sector 5 is attached to the rotor 4. Therefore, if the rotor 4 rotates, the 1st sector 5 will also rock | fluctuate with it.

  The first sector 5 is provided with an engaging pin 7, and the second sector 6 is provided with an engaging groove 8. The engagement groove 8 engages with the engagement pin 7 and when the first sector 5 swings, the second sector 6 swings around the second support shaft 2c and opens and closes the shutter opening 2a. It is a shape that can be done.

  The mounting member 10 in the sector drive device 1 is integrally formed by insert molding using the first sector 5 and the rotor 4 as insert products. Hereinafter, the procedure of insert molding will be described. First, a cylindrical space is formed in the peripheral portion of the shaft hole of the rotor 4 with the rotor 4 made of a permanent magnet formed in a cylindrical shape and the resin-made first sector 5 manufactured by press punching or the like installed. A mold is prepared in which a ring-shaped space is formed in the periphery of the upper surface of the shaft hole of the first sector 5 and the bottom surface of the rotor 4. Next, the rotor 4 and the first sector 5 are stored in a mold. When the rotor 4 and the first sector 5 are housed in the mold, the shaft holes are installed so as to overlap each other accurately. Thereafter, the resin is poured into the space in the mold. If the mold is removed after the resin has hardened, the rotor 4 and the first sector 5 are integrally molded while being sandwiched between the first collar portion 9a and the second collar portion 9b of the mounting member 10. With the above method, the rotor 4 and the first sector 5 are connected to the first collar portion 9a and the second flange of the mounting member 10 in a state where the shaft holes provided in both the rotor 4 and the first sector 5 are accurately overlapped. Since it is clamped by the flange portion 9b, the first sector 5 can be accurately positioned and held on the rotor 4.

By accurately positioning and holding the first sector 5 on the rotor 4, the shutter opening 2a can be opened and closed without applying an extra load to the first support shaft 2b. Further, it is possible to prevent the first sector 5 from falling off from the rotor 4 when it is a finished product.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view of the sector drive device 1a of the second embodiment, similar to FIG. Here, the difference between the sector drive device 1a of the second embodiment and the sector drive device 1 of the first embodiment is that the mounting member 10 of the sector drive device 1a has a third collar as shown in FIG. It is a point including the part 9c. Since the third collar portion 9c is interposed between the first sector 5 and the rotor 4, the first sector 5 is sandwiched between the first collar portion 9a and the third collar portion 9c, and the rotor 4 has the second collar portion. 9b and the third collar portion 9c. In this way, the first sector 5 and the rotor 4 are directly sandwiched between the flange portions, so that the first sector 5 is positioned and held on the rotor 4 in a state that is much more stable than the sector drive device 1 of the first embodiment. It becomes possible to do. The effect of preventing the first sector 5 from falling off from the rotor 4 is also more sufficiently exhibited than the sector drive device 1 of the first embodiment. In other respects, the configuration is the same.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes can be made within the scope of the gist of the present invention described in the claims. Is possible. For example, although the mounting member 10 is integrally molded using the same resin, two-color molding in which two or more kinds of resins are poured in insert molding can also be performed.

It is a top view of the sector drive device of Example 1, and shows the state which opened the shutter opening. It is a top view of the sector drive device of Example 1, and shows the state which closed the shutter opening. It is the expanded sectional view which made it the cross section by the AA line in FIG. 1, and expanded one part. It is sectional drawing of the sector drive device about Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Sector drive device 2 Board | substrate 2a Shutter opening 2b 1st spindle 2c 2nd spindle 3 Stator 3a Coil 4 Rotor 5 1st sector 6 2nd sector 7 Engagement pin 8 Engagement groove 9 Bearing part 9a 1st collar Part 9b Second collar part 9c Third collar part 10 Mounting member 11 Space 11a Relief hole

Claims (3)

A sector drive device comprising a sector, a stator around which a coil is wound, a rotor that rotates around a support shaft, and an attachment member that attaches the sector to the rotor,
The mounting member includes a cylindrical bearing portion fitted into the support shaft, and a first collar portion and a second collar portion projecting radially outward of the support shaft from both ends of the bearing portion. The sector drive device characterized in that the first collar part and the second collar part sandwich the rotor and the sector. The sector drive device according to claim 1, wherein the attachment member further includes a third collar portion between the sector and the rotor. The sector drive device according to claim 1 or 2, wherein the rotor and the sector are insert products, and the mounting member is formed by insert molding.

Images