JP2014071145A - Shutter apparatus and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To materialize a shutter apparatus in which the durability of a shutter blade can be improved without preventing the acceleration of a shutter speed.SOLUTION: The shutter apparatus includes a plurality of shutter blades, and a drive part which drives the shutter blades to open/close. The thickness of a portion of the shutter blade to slide on or come in contact with the drive part by a repetition of the opening/closing drive is set to be larger compared with the other portions.

Description

  The present invention relates to a shutter device mounted on an imaging device.

  In a digital camera or the like, a high shutter speed is required for adjusting the amount of light at high luminance in order to widen the dynamic range of the image sensor. However, an adverse effect of increasing the shutter speed is deterioration of the shutter blades during operation durability. As a method of solving such a problem, there are a method of increasing the thickness of the entire blade, and a method of partially increasing the strength by using two blade members (see, for example, Patent Document 1).

JP 2004-138777 A

  A conventional shutter blade is formed by stamping a sheet material made of polyester or the like having a uniform thickness, and it is necessary to increase the thickness of the entire shutter blade in order to increase durability. For this reason, the weight of the portion that does not need to be reinforced also increases, which is disadvantageous for increasing the shutter speed.

  Further, even when two blade materials are bonded to each other as in Patent Document 1, the shape of the portion to be reinforced is limited due to manufacturing problems, and the weight of the portion that does not need to be increased increases. It is hard to say that a truly optimal shape has been realized.

  The present invention has been made in view of the above problems, and an object thereof is to realize a shutter device capable of improving the durability of shutter blades without hindering an increase in shutter speed.

  In order to solve the above-described problems and achieve the object, a shutter device according to the present invention includes a plurality of shutter blades and a drive unit that opens and closes the shutter blades. By repeating the opening / closing drive, the thickness of the portion that slides or abuts on the drive portion is made larger than that of the other portions.

  According to the present invention, the durability of the shutter blades can be improved without hindering the increase in shutter speed.

1 is an exploded perspective view of a shutter device according to an embodiment of the present invention. The perspective view of the shutter blade | wing of FIG. The figure which shows the fully closed state of the shutter blade | wing of FIG. The figure which shows the open state of the shutter blade | wing of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention with reference to an accompanying drawing is demonstrated in detail. The following embodiment is an example for realizing the present invention, and the present invention is not limited to the following embodiment. The dimensions, materials, shapes, relative arrangements, and the like of the components of this embodiment should be appropriately modified or changed according to the configuration of the apparatus to which the present invention is applied and various conditions without departing from the spirit of the present invention. is there.

  [Embodiment 1] The configuration of a shutter device according to an embodiment of the present invention will be described with reference to FIGS.

  First, in FIG. 1, the shutter blades 1 and 2 have long holes 1a and 2a and holes 1b and 2b, respectively. Rotating shafts 3b and 3a (see FIGS. 3 and 4) provided on the base plate 3 are rotatably fitted in the holes 1b and 2b, and the elongated holes 1a and 2a of the shutter blades 1 and 2 are fitted in the holes 1b and 2b. The lever pin 4a of the magnet rotor 4 is integrally inserted with the drive lever. The magnet rotor 4 forms a drive unit for the shutter blades 1 and 2 together with the winding coil 6 and the yoke 5 into which the winding coil 6 is inserted. As a result, the lever pin 4a rotates as the magnet rotor 4 rotates, so that the shutter blades 1 and 2 rotate (open / close drive) around the holes 1b and 2b fitted to the rotation shafts 3b and 3a. . In addition, the upper end part (in FIG. 1) of the magnet rotor 4 is rotatably supported by the bearing 7, and the lower end part is rotatably supported by a hole provided in the base plate 3.

  Here, the structure of the shutter blades 1 and 2 will be described in detail with reference to FIG. FIG. 2 representatively shows one shutter blade 1 of a plurality of shutter blades 1 and 2 having the same configuration.

  In FIG. 2, the shutter blade 1 has a slot 1a, a hole portion 1b, and a surface portion 1c, 1d that abuts against and slides against a stopper portion of the base plate 3 when opening and closing, which will be described later. Thickness for reinforcement is given. Similarly, the shutter blade 2 has a thickness for reinforcement. Although it is assumed that the reinforcing portion is press-formed by rolling or the like, any method may be used as long as there is an optimum processing method.

  Thus, by providing the reinforcing thickness only to the portion that is likely to be deteriorated (damaged) due to repeated opening / closing driving of the shutter blades 1 and 2, the weight of the shutter blades 1 and 2 is not increased more than necessary. A decrease in shutter speed can be minimized. Further, it is possible to suppress deterioration of the shutter blades 1 and 2 and improve durability.

  In the shutter device having the above-described configuration, when the winding coil 6 is energized, the magnet rotor 4 rotates according to the energizing direction by the magnetic action with the yoke 5 and is inserted into the elongated holes 1a and 2a of the shutter blades 1 and 2. The lever pin 4a is rotated. Therefore, the shutter blades 1 and 2 rotate in the rotating direction from the fully closed state shown in FIG. 3, for example, to the open state shown in FIG. On the other hand, when the energization direction to the winding coil 6 is reversed, the magnet rotor 4 rotates in the reverse direction and the lever pin 4a also rotates in the reverse direction. Therefore, the shutter blades 1 and 2 rotate from the open state shown in FIG. 4 to the fully closed state shown in FIG.

  By the way, when the shutter blades 1 and 2 are rotated from the open state to the fully closed state, as shown in FIG. 3, the surface portion 1c of the shutter blade 1 abuts against the stopper portion 3c of the base plate 3, and the shutter blade 2 As shown in FIG. 3, the surface portion 2 c abuts against the stopper portion 3 d of the main plate 3. On the other hand, when the shutter blades 1 and 2 are rotated from the fully closed state to the open state, as shown in FIG. 4, the surface portion 1 d of the shutter blade 1 abuts against the stopper portion 3 d of the base plate 3, and the shutter blade 2 As shown in FIG. 4, the surface portion 2 d abuts against the stopper portion 3 c of the base plate 3.

  If the opening / closing operation is repeated, the base plate 3 of the shutter blades 1 and 2 comes into contact with each other, leading to deterioration (damage) of the abutting / sliding portion and the fitting portion. In response to such a problem, in the present embodiment, as shown in FIG. 2, in the shutter blades 1 and 2, the long holes 1a and 2a through which the driving force is transmitted from the driving unit and the rotation of the shutter blades 1 and 2 are rotated. The central hole portions 1b and 2b and the surface portions 1c, 2c, 1d, and 2d that abut against the stopper portions 3c and 3d that stop and support the shutter blades have a thickness for reinforcement. Thereby, it is possible to suppress deterioration (breakage) of the portions (surface portions 1c, 2c, 1d, 2d) or fitting portions (long holes 1a, 2a, hole portions 1b, 2b) that abut against the stopper portions 3c, 3d of the base plate 3. And the durability can be improved.

  Further, in the present embodiment, the shutter blades 1 and 2 are provided with a thickness for reinforcing the elongated holes 1a, 2a, and the shutter blades 1 and 2 through which driving force is transmitted from the driving unit. It is easy to deteriorate including the surface portions 1c, 2c, 1d, and 2d that abut against and slide against the hole portions 1b and 2b that become the rotation center and the stopper portions 3c and 3d that stop and support the shutter blades 1 and 2. Since it is only the portion, the reduction in the shutter speed can be suppressed to a minimum without increasing the weight of the shutter blades 1 and 2 more than necessary as in the conventional case. That is, the increase in shutter speed is not hindered.

  [Embodiment 2] In Embodiment 1, an example of a so-called lens shutter in which the shutter device simply opens and closes the lens opening has been described. However, in recent years, various functions have been added to the lens shutter. Therefore, the present invention exhibits the same effect even when it is configured with a combination with a neutral density filter or a light amount adjusting device, for example.

  Note that the shutter device according to each of the above-described embodiments is mounted and used in an imaging device such as a camera.

Claims (4)

A plurality of shutter blades;
A drive unit that opens and closes the shutter blades,
A shutter device characterized in that a thickness of a portion of the shutter blade that slides or abuts on the driving portion by repeating the opening / closing drive is made larger than that of other portions.   2. The shutter device according to claim 1, wherein the portion that slides or abuts on the driving unit is a hole that slides on a shaft of the driving unit or a surface that abuts on the shaft.   The shutter device according to claim 1, wherein the shutter device is configured by combining a neutral density filter or a light amount adjusting device.   An imaging apparatus comprising the shutter device according to any one of claims 1 to 3.

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