JP2018146629A - Blade drive device, and camera including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade drive device that can minimize an individual difference between finished products occurring by a variation in component dimensions or characteristic of an electromagnetic actuator, and can adjust a drive velocity or a stop diameter before products are finished.SOLUTION: A sutter module 20 serving as a blade drive device comprises: a base plate 40; a revolving pin 70 that is fixed to the base plate 40; a shutter blade 30 that is rotatably attached to the revolving pin 70; and an electromagnetic actuator 50 that drives the shutter blade 30 by electromagnetic force. The electromagnetic actuator 50 has a drive pin 54 that engages with an elongated hole 38 formed in the shutter blade 30 to revolve around a drive shaft A, and revolve the shutter blade 30 around a revolving shaft A. The shutter module 20 comprises a distance adjustment holding structure that adjusts a distance between an engagement point P of the drive pin 54 relative to the elongated hole 38 and the revolving shaft Aof the shutter blade 30, and holds the adjusted distance.SELECTED DRAWING: Figure 4 1

Description

  The present invention relates to a blade driving device and a camera equipped with the blade driving device, and more particularly to a blade driving device that drives blades such as a shutter and a diaphragm by an electromagnetic actuator.

  A general camera includes a blade driving device that drives a shutter blade that blocks light from a subject and a diaphragm blade that adjusts the amount of light. As such a blade driving device, a device that drives a blade by an electromagnetic actuator is available. It is widely known (for example, see Patent Document 1). Such a blade drive device is composed of a plurality of components, but there are variations in the dimensions of these components and variations in the characteristics of the built-in electromagnetic actuator. Thus, if products are assembled with variations in component dimensions and electromagnetic actuator characteristics, for example, when shutter blades are driven, there will be individual differences in shutter speed among finished products. When the diaphragm blades are driven, individual differences occur in the size of the diaphragm diameter among the finished products. In this way, stable quality cannot be maintained due to variations in component dimensions and electromagnetic actuator characteristics, so individual differences caused by variations in component dimensions and electromagnetic actuator characteristics can be eliminated before product completion. There is a need for technology to make it.

JP 2007-264617 A

  The present invention has been made in view of such problems of the prior art, and can minimize individual differences between finished products caused by variations in component dimensions and electromagnetic actuator characteristics. An object of the present invention is to provide a blade driving device capable of adjusting the driving speed and the aperture diameter, and a camera equipped with such a blade driving device.

  According to the aspect of the present invention, individual differences between finished products caused by variations in component dimensions and electromagnetic actuator characteristics can be minimized, and the blade driving speed and the aperture diameter can be adjusted before the product is completed. Provided is a blade drive that can. The blade driving device includes a ground plate, a rotation pin fixed to the ground plate, a blade attached to the rotation pin so as to be rotatable, and an electromagnetic actuator that drives the blade by electromagnetic force. The electromagnetic actuator has a drive pin that rotates around the drive shaft while engaging with a long hole formed in the blade to rotate the blade around the rotation axis. The blade drive device includes a distance adjustment holding structure that adjusts a distance between an engagement point of the drive pin with respect to the elongated hole and the rotation shaft of the blade, and holds the adjusted distance.

  According to the blade drive device of the present invention, the distance adjustment holding structure adjusts the distance between the engagement point of the drive pin with respect to the long hole of the blade and the rotation axis of the blade before the product is completed, and a desired distance is obtained. Thus, it is possible to realize a desired shutter speed and aperture diameter. Therefore, even if there are variations in component dimensions and electromagnetic actuator characteristics, individual differences between finished products can be minimized.

  The pivot pin is configured to be rotatable with respect to the ground plane around a first cylindrical portion having the rotation axis as a central axis and an eccentric shaft at a position eccentric from the central axis of the first cylindrical portion. And a second cylindrical portion. In this case, the first cylindrical portion is inserted into a rotation hole formed in the shutter blade. A pin fixing hole for fixing the second cylindrical portion of the rotating pin is formed in the base plate. The distance adjustment holding structure includes the first cylindrical portion of the rotating pin, the second cylindrical portion, and the pin fixing hole of the base plate. As described above, the above-described distance adjustment holding structure can be realized by a simple structure using the rotation pin and the pin fixing hole of the main plate. In this case, it is preferable that the rotation pin further includes an operation unit that operates rotation of the second cylindrical portion with respect to the base plate.

  The electromagnetic actuator may further include a rotor that can rotate around the drive shaft, and a connecting portion that connects the rotor and the drive pin. In this case, the drive pin of the electromagnetic actuator may include a cam portion that engages with the elongated hole formed in the blade, and a shaft portion that connects the cam portion and the connection portion. Good. The shaft portion is configured to be rotatable with respect to the connection portion about an eccentric shaft at a position eccentric from the center axis of the cam portion. A pin fixing hole for fixing the shaft portion of the drive pin is formed in the connection portion. The distance adjustment holding structure includes the cam portion of the drive pin, the shaft portion, and the pin fixing hole of the connection portion. As described above, the above-described distance adjustment holding structure can be realized by a simple structure including the drive pin and the pin fixing hole of the connection portion. In this case, it is preferable that the drive pin has an operation part that operates rotation of the shaft part with respect to the connection part.

  Further, the drive pin of the electromagnetic actuator includes a shaft portion inserted into an adjustment hole formed in the connection portion, and one end portion of the shaft portion connected to the elongated hole formed in the blade. It may include a cam portion that engages and a fixing portion that is connected to the other end portion of the shaft portion and fixes the shaft portion and the cam portion to the connection portion. The distance adjustment holding structure includes the shaft portion of the drive pin, the cam portion, the fixing portion, and the adjustment hole of the connection portion. In this case, it is preferable that the shaft portion of the drive pin and the fixed portion are configured to be screwed together. Thus, the above-described distance adjustment holding structure can be realized by a simple structure using the drive pin and the adjustment hole of the connection portion. Moreover, it is preferable that the said drive pin has an operation part which operates rotation of the said axial part with respect to the said connection part.

  It is preferable that the top part of the operation part is configured to be exposed to the outside in a window part formed in the casing that houses the blades. With this configuration, the operation unit can be easily operated from the outside.

  According to the aspect of the present invention, individual differences between finished products caused by variations in component dimensions and electromagnetic actuator characteristics can be minimized, and the blade driving speed and the aperture diameter can be adjusted before the product is completed. A camera is provided that can. This camera includes an imaging surface on which light from a subject is incident, the blade driving device described above, and a lens module disposed between the subject and the imaging surface. The blade driving device is disposed between the subject and the imaging surface.

  According to the present invention, the distance adjustment holding structure can adjust the distance between the engagement point of the drive pin with respect to the long hole of the blade and the rotation axis of the blade before the product is completed, and can maintain a desired distance. Thus, a desired shutter speed and aperture diameter can be realized. Therefore, even if there are variations in component dimensions and electromagnetic actuator characteristics, individual differences between finished products can be minimized.

FIG. 1 is a perspective view showing a smartphone with a built-in camera according to the first embodiment of the present invention. FIG. 2 is a diagram schematically showing the configuration of the camera shown in FIG. FIG. 3 is a perspective view showing a shutter module of the camera shown in FIG. FIG. 4 is an exploded perspective view of the shutter module shown in FIG. FIG. 5 is a front view showing an electromagnetic actuator of the shutter module shown in FIG. FIG. 6 is a front view showing a state where a blade cover of the shutter module shown in FIG. 3 is removed. FIG. 7A is a perspective view of a rotation pin of the shutter module shown in FIG. FIG. 7B is a plan view of the rotation pin shown in FIG. 7A. FIG. 8A is a diagram showing a relationship between the drive pins and the shutter blades before the shutter operation of the shutter module shown in FIG. FIG. 8B is a diagram illustrating a relationship between the drive pins and the shutter blades during the shutter operation of the shutter module illustrated in FIG. 3. FIG. 9 is a diagram illustrating a shutter speed adjustment process in the shutter module shown in FIG. FIG. 10 is an exploded perspective view of the shutter module according to the second embodiment of the present invention. FIG. 11 is a front view showing the electromagnetic actuator of the shutter module shown in FIG. FIG. 12 is an exploded perspective view of a part of the electromagnetic actuator shown in FIG. FIG. 13 is a cross-sectional view of the drive pins and connecting portions of the electromagnetic actuator shown in FIG. FIG. 14 is a front view showing a state where the blade cover of the shutter module shown in FIG. 10 is removed.

  Hereinafter, embodiments of a camera and a blade driving device according to the present invention will be described in detail with reference to FIGS. 1 to 14, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In addition, in FIGS. 1 to 14, the scale and dimensions of each component are exaggerated, and some components may be omitted.

  FIG. 1 is a perspective view showing a smartphone 1 incorporating the camera 10 according to the first embodiment of the present invention as an example of an aspect to which the present invention is applied, and FIG. 2 is a schematic diagram of the configuration of the camera 10 shown in FIG. FIG. As shown in FIGS. 1 and 2, the camera 10 according to the present embodiment is incorporated in the smartphone 1, and a lens module 12 embedded in the back surface of the smartphone 1 and light transmitted through the lens module 12. A shutter module (blade driving device) 20 that drives a shutter blade that can be shut off, and an imaging element 14 that is disposed on an imaging surface on which light transmitted through the lens module 12 enters (image formation) are provided. In the illustrated example, the shutter module 20 is disposed between the lens module 12 and the imaging surface (imaging device 14). In the following embodiments, a shutter module that drives shutter blades will be described as an example of the blade driving device, but the present invention can also be applied to blade driving devices other than the shutter module. For example, the present invention can be applied to a blade driving device that drives a diaphragm blade.

  3 is a perspective view showing the shutter module 20, and FIG. 4 is an exploded perspective view. As shown in FIGS. 3 and 4, the shutter module 20 includes an opening plate 24 in which an opening 22 that transmits light from the lens module 12 described above is formed, and a shutter blade that can move on the opening 22 of the opening plate 24. 30, a base plate 40 to which the aperture plate 24 and the shutter blade 30 are attached, an electromagnetic actuator 50 that drives the shutter blade 30 by electromagnetic force, a blade cover 60 that is attached to the base plate 40, and the shutter blade 30 are rotatably supported. And a rotation pin 70. As shown in FIG. 4, the opening plate 24, the shutter blade 30, and the blade cover 60 are arranged in this order on one side of the base plate 40, and the electromagnetic actuator 50 is arranged on the opposite side. Thus, the main plate 40 and the blade cover 60 constitute a housing that houses the shutter blade 30 therein.

  As shown in FIG. 4, the base plate 40 includes a protrusion 42 that protrudes outward, and the blade cover 60 includes an engagement piece 62 that engages with the protrusion 42 of the base plate 40. Therefore, the blade cover 60 can be attached to the main plate 40 by engaging the engaging piece 62 of the blade cover 60 with the protrusion 42 of the main plate 40. The base plate 40 is formed with a screw hole 44 for screwing the screw 64, and the blade cover 60 is formed with an insertion hole 66 for inserting the screw 64. Therefore, the blade cover 60 can be fixed to the base plate 40 by inserting the screw 64 into the insertion hole 66 of the blade cover 60 and screwing it into the screw hole 44 of the base plate 40.

FIG. 5 is a front view showing the electromagnetic actuator 50 of the shutter module 20. As shown in FIG. 5, the electromagnetic actuator 50 includes a cylindrical rotor 51 made of a permanent magnet, a yoke 52 having a pair of tip portions 52A and 52A disposed so as to sandwich the rotor 51, and a yoke 52. the tip portion 52A, a coil 53 to rotate the rotor 51 by causing the magnetic pole around the drive shaft a ₁ to 52A, a cylindrical drive pin 54 having a center axis parallel with the drive shaft a ₁ of the rotor 51 A connecting portion 55 that extends radially outward from the rotor 51 and connects the rotor 51 and the drive pin 54, and a flexible printed circuit board (FPC) 56 in which a conductive path for flowing current to the coil 53 is formed. Contains. The cylindrical drive pin 54 includes a cam portion that engages with the long hole 38 formed in the shutter blade 30, and a shaft portion that connects the cam portion and the connection portion 55.

The rotor 51 of the electromagnetic actuator 50 is divided into two at the center and magnetized with different magnetic poles (N pole and S pole), and the outer peripheral surface of the rotor 51 is configured to have different magnetic poles along the circumferential direction. Has been. The front end portions 52 </ b> A and 52 </ b> A of the yoke 52 are disposed so as to face the outer peripheral surface of the rotor 51. The yoke 52 is inserted into the core portion of the coil 53. When current is supplied to the coil 53 via the FPC 56, magnetic poles are generated at the tip portions 52A and 52A of the yoke 52, and the rotor 51 is rotated by magnetic force. It is supposed to be. In the example shown in FIG. 5, by supplying a current to the coil 53, the rotor 51 rotates clockwise about the drive shaft A ₁ . Further, the drive pin 54 connected to the rotor 51 by the connecting portion 55 also rotates clockwise around the drive axis A ₁ together with the rotor 51.

  As shown in FIG. 4, through holes 48 and 28 through which the drive pins 54 of the electromagnetic actuator 50 described above are inserted are formed in the base plate 40 and the opening plate 24, respectively. The shutter blade 30 is formed with a long hole 38 that engages with the drive pin 54. A window portion 68 is formed in the blade cover 60 so that the tip of the drive pin 54 is exposed to the outside at the window portion 68 of the blade cover 60 when the shutter module 20 is assembled (see FIG. 3). .

  Further, as shown in FIG. 4, a pin fixing hole 45 is formed in the base plate 40, and the rotation pin 70 is inserted into the pin fixing hole 45. The opening plate 24 is formed with a through hole 25 through which the rotation pin 70 is inserted. Further, the shutter blade 30 is formed with a rotation hole 35 into which the rotation pin 70 is inserted in a sliding contact state. A window portion 65 is formed in the blade cover 60, and when the shutter module 20 is assembled, the tip of the rotation pin 70 (a third cylindrical portion 73 described later) is exposed to the outside at the window portion 65 of the blade cover 60. (See FIG. 3).

  As shown in FIG. 4, the ground plane 40 includes a guide post 47 protruding in the Y direction, and a guide hole 27 is formed in the opening plate 24 corresponding to the guide post 47 of the ground plane 40. When the shutter module 20 is assembled, the opening plate 24 is positioned with respect to the base plate 40 by inserting the guide posts 47 of the base plate 40 into the guide holes 27 of the opening plate 24.

  FIG. 6 is a front view showing a state where the blade cover 60 of the shutter module 20 is removed. As shown in FIG. 6, the opening plate 24 has an outer shape corresponding to a plurality of protruding portions 46 formed on the ground plate 40, and the outer edge portion of the opening plate 24 engages with the protruding portions 46 of the ground plate 40. This restricts the movement of the aperture plate 24 in the XZ plane.

7A is a perspective view of the rotation pin 70, and FIG. 7B is a plan view. As shown in FIGS. 7A and 7B, the rotation pin 70 is inserted into the through hole 25 formed in the opening plate 24 and is inserted into the rotation hole 35 of the shutter blade 30 in a sliding state. 71, a second cylindrical portion 72 that is inserted and fixed in the pin fixing hole 45 of the base plate 40, and a third cylindrical portion 73 that is exposed to the outside at the window portion 65 of the blade cover 60 when the shutter module 20 is assembled. Including. The second cylindrical portion 72 and the third cylindrical portion 73 extend from the first cylindrical portion 71 to the opposite sides along the Y direction, and have the same central axis A ₃ and the same outer diameter.

The outer diameter of the first cylindrical portion 71 is substantially the same as the inner diameter of the rotation hole 35 of the shutter blade 30, and the shutter blade 30 slides on the outer peripheral surface of the first cylindrical portion 71 while moving the first cylindrical portion 71. It rotates around the central axis A ₂ (see FIG. 7B) of the cylindrical portion 71. As shown in FIG. 7B, the central axis A ₃ of the second cylindrical portion 72 and the third cylindrical portion 73 is parallel to the central axis A ₂ at a position eccentric from the central axis A _{2 of} the first cylindrical portion 71. It extends.

As shown in FIG. 7A, a groove 74 for inserting a tool such as a screwdriver is formed on the end surface of the third cylindrical portion 73. By inserting, for example, a flat-blade screwdriver into the groove 74 of the third cylindrical portion 73 and rotating it, the entire rotation pin 70 inserted into the pin fixing hole 45 of the main plate 40 is moved to the central axis (eccentricity) of the second cylindrical portion 72. axis) can be rotated around a _3. Thus, in this embodiment, the groove 74 of the rotation pin 70 functions as an operation unit that operates the rotation of the rotation pin 70 relative to the main plate 40.

  Next, the shutter operation of the shutter module 20 having such a configuration will be described. FIG. 8A is a diagram showing the relationship between the drive pin 54 and the shutter blade 30 before the shutter operation of the shutter module 20, and FIG. 8B is a diagram showing the relationship during the shutter operation.

When a current is supplied to the coil 53 and the shutter operation is started in the state shown in FIG. 8A, the rotor 51 is rotated clockwise around the drive shaft A ₁ by the magnetic pole generated at the tip portions 52A and 52A of the yoke 52. To do. With the rotation of the rotor 51, the drive pin 54 connected to the rotor 51 also rotates clockwise about the drive shaft A _1. At this time, the drive pin 54 rotates about the drive axis A ₁ while engaging with the long hole 38 of the shutter blade 30, and therefore, the drive pin 54 is at the engagement point P between the drive pin 54 and the long hole 38 of the shutter blade 30. Exerts a force on the shutter blade 30, and this force causes the shutter blade 30 to rotate counterclockwise about the central axis A ₂ of the first cylindrical portion 71 of the rotation pin 70. As a result, as shown in FIG. 8B, the shutter blade 30 moves from the position S ₁ before the shutter operation shown in FIG. 8A to the position S ₂ that covers the opening 22 of the aperture plate 24 and passes through the lens module 12 from the subject. The light is blocked from reaching the imaging surface of the imaging device 14.

The speed of the shutter operation (shutter speed) described above varies depending on variations in dimensions of components such as the shutter blades 30 and the drive pins 54 and variations in characteristics of the electromagnetic actuator 50. This shutter speed can be adjusted, for example, by changing the distance between the engagement point P of the drive pin 54 and the rotation axis of the shutter blade 30 described above. In the present embodiment, the distance between the engagement point P of the drive pin 54 and the rotation axis of the shutter blade 30 (the central axis A ₂ of the first cylindrical portion 71 of the rotation pin 70) is adjusted in this way. Adjust the shutter speed.

  Specifically, first, with the shutter module 20 temporarily assembled, the shutter speed of the shutter module 20 is measured by the shutter speed measuring device. This shutter speed measuring device measures the shutter speed by measuring the time during which light has passed through the opening 22 of the aperture plate 24. When the measured shutter speed is not a desired value, the rotation pin 70 inserted into the pin fixing hole 45 of the main plate 40 is rotated in order to change the shutter speed. The rotation pin 70 is rotated by rotating the third cylindrical portion 73. In a state where the shutter module 20 is temporarily assembled, the third cylindrical portion 73 of the rotation pin 70 is exposed to the outside at the window portion 65 of the blade cover 60 (see FIG. 3). The rotation pin 70 can be easily rotated by inserting and rotating, for example, a flat-blade screwdriver in the groove 74 (operation part) at the top of the head.

At this time, the rotation pin 70 rotates around the eccentric shaft A ₃ (see FIG. 7B) of the second cylindrical portion 72. As described above, the eccentric shaft A ₃ of the second cylindrical portion 72 is because of the position deviated from the central axis a ₂ of the first cylindrical portion 71 of the pivot pin 70, the central axis a ₂ of the first cylindrical portion 71, that is, the rotational axis of the shutter blade 30, the pivot pin 70 Is rotated about the eccentric axis A ₃ of the second cylindrical portion 72. For example, when the rotation pin 70 is rotated 90 degrees counterclockwise from the state S ₁ before the shutter operation shown in FIG. 8A, the position of the rotation axis of the shutter blade 30 (the central axis A _{2 of} the first cylindrical portion 71). There is changed, a state S ₃ shown in FIG.

As described above, in the present embodiment, by rotating the rotation pin 70, the position of the rotation axis of the shutter blade 30 (the central axis A _{2 of} the first cylindrical portion 71) can be moved, and the drive pin 54. The distance between the engagement point P and the rotation axis of the shutter blade 30 can be changed. Therefore, by rotating the rotation pin 70, the distance between the engagement point P of the drive pin 54 and the rotation axis of the shutter blade 30 (the central axis A _{2 of} the first cylindrical portion 71) is adjusted and desired. The shutter speed can be adjusted to obtain.

  As described above, when the shutter speed is adjusted by rotating the rotation pin 70 and the shutter speed measuring device confirms that the desired shutter speed has been obtained, The shutter module 20 is completed by fixing the two cylindrical portions 72 to the pin fixing holes 45 of the base plate 40 by adhesion or caulking. In this embodiment, since the shutter speed can be adjusted before the product is completed in this way, it is possible to minimize the variation in the shutter speed between the finished products. In addition, when rotating the rotation pin 70, the second cylindrical portion 72 is lightly press-fitted into the pin fixing hole 45 of the base plate 40 so that the second cylindrical portion 72 of the rotation pin 70 can rotate. Thereafter, it may be fixed. Or when rotating the rotation pin 70, the rotation pin 70 is hold | maintained with the driver (jig) inserted in the groove | channel 74 of the top part of the 3rd cylindrical part 73, and after that, by adhesion | attachment or crimping The rotating pin 70 may be fixed.

As described above, in the present embodiment, the second cylindrical portion 72 is rotated by operating the third cylindrical portion 73 of the rotation pin 70, and the shutter is the central axis of the first cylindrical portion 71. The rotation axis A ₂ of the blade 30 can be moved. Thus, it is possible to adjust the distance between the rotation axis A ₂ of the engagement point P and the shutter blade 30 of the drive pin 54 relative to the long hole 38 of the shutter blade 30 to a distance to achieve the desired shutter speed, adjusted By fixing the second cylindrical portion 72 of the rotation pin 70 in the pin fixing hole 45 of the main plate 40, the adjusted desired shutter speed can be maintained. In other words, in this embodiment, the engagement point P of the drive pin 54 with respect to the long hole 38 of the shutter blade 30 is determined by the first cylindrical portion 71, the second cylindrical portion 72, and the pin fixing hole 45 of the base plate 40. A distance adjustment holding structure that adjusts the distance between the shutter blade 30 and the rotation axis A ₂ and holds the adjusted distance is configured. If the distance between the engagement point P of the drive pin 54 with respect to the long hole 38 of the shutter blade 30 and the rotation axis A ₂ of the shutter blade 30 can be adjusted, the third cylindrical portion 73 of the rotation pin 70 can be adjusted. It is not necessary to form the groove 74 as the operation portion.

  FIG. 10 is an exploded perspective view of the shutter module 120 according to the second embodiment of the present invention. In the following, the description will focus on the parts that are different from the first embodiment described above, and a duplicate description will be omitted.

  As shown in FIG. 10, a cylindrical shaft portion 145 having a single central axis extends in the Y direction on the ground plane 140 in the present embodiment, and this shaft portion 145 rotates in the first embodiment. It replaces the pin 70. That is, the shaft portion 145 is inserted into the through hole 25 formed in the opening plate 24 and inserted into the rotation hole 35 of the shutter blade 30 in a sliding state. The shaft portion 145 is configured such that the end of the shaft portion 145 is exposed to the outside at the window portion 65 of the blade cover 60 when the shutter module 120 is assembled.

  FIG. 11 is a front view showing the electromagnetic actuator 150 in the present embodiment. As shown in FIG. 11, the electromagnetic actuator 150 in the present embodiment includes a connection portion 155 that extends radially outward from the rotor 51, and a drive pin 154 attached to the tip of the connection portion 155. Unlike the drive pin 54 in the first embodiment, the drive pin 154 is configured to be movable with respect to the connection portion 155. The drive pin 154 is inserted into the through hole 48 of the base plate 140 and the through hole 28 of the opening plate 24 and is engaged with the long hole 38 of the shutter blade 30. Further, when the shutter module 120 is assembled, the tip of the drive pin 154 is exposed to the outside at the window portion 68 of the blade cover 60.

  FIG. 12 is an exploded perspective view of a part of the electromagnetic actuator 150. As shown in FIG. 12, an elongated adjustment hole 180 is formed at the tip of the connection portion 155. The drive pin 154 includes a thin cylindrical shaft portion 191, a cylindrical cam portion 192 connected to one end portion of the shaft portion 191, and an end portion opposite to the cam portion 192 across the connection portion 155. And a nut 193 disposed on the surface. This cam portion 192 is adapted to engage with a long hole 38 formed in the shutter blade 30. A screw thread (not shown) is formed at the tip of the shaft portion 191 on the nut 193 side, and is screwed with the nut 193. A groove 194 for inserting a tool such as a driver is formed on the end surface of the cam portion 192. A nut 193 can be screwed into the shaft portion 191 by inserting, for example, a minus driver into the groove 194 of the cam portion 192 and rotating it.

  FIG. 13 is a cross-sectional view of the drive pin 154 and the connection portion 155. As shown in FIG. 13, the outer diameter of the shaft portion 191 is substantially the same as the width of the adjustment hole 180 of the connection portion 155, and the drive pin 154 moves along the extending direction of the adjustment hole 180 of the connection portion 155. It is possible. On the other hand, the outer diameter of the cam portion 192 is larger than the dimension of the adjustment hole 180 of the connection portion 155. Therefore, the drive pin 154 can be fixed to the connection portion 155 by moving the drive pin 154 to a desired position of the connection portion 155 and then tightening the nut 193 to the shaft portion 191. That is, the nut 193 in this embodiment has a role as a fixing portion that fixes the shaft portion 191 and the cam portion 192 to the connection portion 155.

FIG. 14 is a front view showing a state where the blade cover 60 of the shutter module 120 is removed. In the present embodiment, by adjusting the position of the drive pin 154 with respect to the connection portion 155, the point between the point P at which the drive pin 154 engages with the long hole 38 of the shutter blade 30 and the central axis A ₄ of the shaft portion 145. The distance can be adjusted. Since the shutter blade 30 is to rotate while sliding on the central axis A ₄ about the axle 145, by adjusting the position of the driving pin 154, rotation of the engagement point P and the shutter blade 30 of the drive pin 154 axis The distance from the center axis A ₄ of the shaft portion 145 can be adjusted, and the shutter speed can be adjusted similarly to the first embodiment.

  More specifically, first, with the shutter module 120 temporarily assembled, the shutter speed of the shutter module 120 is measured by the shutter speed measuring device. At this time, the drive pin 154 is movable in the adjustment hole 180 of the connection portion 155 in a state where the nut 193 of the drive pin 154 is loosened. If the measured shutter speed is not the desired value, the drive pin 154 is moved within the adjustment hole 180 in order to change the shutter speed. In the state where the shutter module 120 is temporarily assembled, the cam portion 192 of the drive pin 154 is exposed to the outside at the window portion 68 of the blade cover 60. Therefore, for example, a minus driver is inserted into the groove 194 at the top of the cam portion 192. The drive pin 154 can be easily moved by moving it.

  If the shutter speed is adjusted by moving the drive pin 154 in the adjustment hole 180 in this way and the shutter speed measuring device confirms that the desired shutter speed has been obtained, the cam of the drive pin 154 The nut 193 of the drive pin 154 is tightened by rotating the minus driver inserted in the groove 194 of the part 192, and the drive pin 154 is fixed to the connection part 155.

As described above, in the present embodiment, the drive pin 154 is moved by operating the cam portion 192 of the drive pin 154, and the point P where the drive pin 154 engages with the long hole 38 of the shutter blade 30 is moved. Can be made. Thus, the distance between the engagement point P of the drive pin 154 with respect to the long hole 38 of the shutter blade 30 and the rotation axis of the shutter blade 30 (the central axis A ₄ of the shaft portion 145) is set to a distance that realizes a desired shutter speed. The adjusted shutter speed can be maintained by fixing the drive pin 154 to the connecting portion 155 after the adjustment. In other words, in this embodiment, the engagement point P of the drive pin 154 with respect to the long hole 38 of the shutter blade 30 is achieved by the shaft portion 191, the cam portion 192, the nut 193, and the adjustment hole 180 of the connection portion 155 of the drive pin 154. And a distance adjustment holding structure for adjusting the distance between the rotation axis of the shutter blades 30 (the center axis A ₄ of the shaft portion 145) and holding the adjusted distance. If the distance between the engagement point P of the drive pin 154 with respect to the long hole 38 of the shutter blade 30 and the rotation axis A ₄ of the shutter blade 30 can be adjusted, the cam portion 192 of the drive pin 154 can serve as an operation portion. It is not necessary to form the groove 194.

  In this embodiment, the nut 193 is used as a fixing portion for fixing the shaft portion 191 and the cam portion 192 of the drive pin 154 to the connection portion 155, but it goes without saying that other fixing means may be used.

  It is also possible to combine the first embodiment and the second embodiment described above. That is, the shutter module can be configured to include both the rotation pin 70 and the pin fixing hole 45 of the base plate 40 in the first embodiment, and the drive pin 154 and the connection portion 155 in the second embodiment. It is.

In the first embodiment described above, by providing the rotation pin 70 with the eccentric axis A ₃ , the engagement point P of the drive pin 54 with respect to the long hole 38 of the shutter blade 30 and the rotation axis A ₂ of the shutter blade 30 are between. However, the adjustment of the distance can also be realized by providing the drive pin 54 with an eccentric shaft. In other words, a central axis (eccentric shaft) of the shaft portion is provided at a position eccentric from the central axis of the cam portion of the drive pin 54, and the shaft portion is configured to be rotatable about the eccentric shaft with respect to the connecting portion 55. 55, a pin fixing hole for fixing the shaft portion of the drive pin 54 is formed, and the engagement point P of the drive pin 54 with respect to the long hole 38 of the shutter blade 30 and the rotation of the shutter blade 30 are formed as in the above embodiment. The distance between the axes can be changed. In this case, an operation for operating the rotation of the drive pin 54 with respect to the connection portion 55 on the top of the cam portion of the drive pin 54 like a groove 74 formed on the top of the third cylindrical portion 73 of the rotation pin 70. A part may be provided.

  As described above, the present invention can be applied not only to the blade driving device that drives the shutter blades but also to the blade driving device that drives the diaphragm blades. When the present invention is applied to a blade driving device for driving the diaphragm blade, the distance between the engagement point of the drive pin with the long hole of the diaphragm blade and the rotation shaft of the diaphragm blade is adjusted by the above-described distance adjustment holding structure. Thus, a desired distance can be maintained. Therefore, by adjusting and maintaining the distance to a desired value before completion of the product, a desired aperture diameter can be realized, and even if there are variations in component dimensions and electromagnetic actuator characteristics, It is possible to minimize the occurrence of individual differences in the size of the aperture diameter.

  In the embodiment described above, a camera including an image sensor that receives light from a subject has been described as an example. However, instead of the image sensor described above, a photosensitive film can be used. That is, the present invention can also be applied to a so-called film camera in which a photosensitive film is disposed on an imaging surface on which light from a subject is incident.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Smart phone 10 Camera 12 Lens module 14 Image pick-up element 20 Shutter module (blade drive device)
22 Opening 24 Opening plate 28 Through hole 30 Shutter blade 35 Rotating hole 38 Long hole 40 Ground plate 45 Pin fixing hole 50 Electromagnetic actuator 51 Rotor 52 Yoke 53 Coil 54 Drive pin 55 Connection part 56 FPC
60 Blade cover 64 Screw 65, 68 Window part 70 Rotating pin 71 1st cylindrical part 72 2nd cylindrical part 73 3rd cylindrical part (operation part)
74 Groove 120 Shutter module 140 Base plate 145 Shaft portion 150 Electromagnetic actuator 154 Drive pin 155 Connection portion 180 Adjustment hole 191 Shaft portion 192 Cam portion 193 Nut (fixed portion)
194 Groove A ₁ Drive shaft A ₂ Rotating shaft P Engagement point

Claims (10)

With the main plate,
A pivot pin fixed to the base plate;
A blade attached rotatably to the rotation pin;
An electromagnetic actuator for driving the blade by electromagnetic force, the electromagnetic actuator having a drive pin that rotates around the drive shaft by engaging with a long hole formed in the blade and rotates the blade around the rotation shaft; ,
A blade drive device comprising: a distance adjustment holding structure that adjusts a distance between an engagement point of the drive pin with respect to the elongated hole and the rotation shaft of the blade, and holds the adjusted distance. The pivot pin is
A first cylindrical portion having the rotation axis as a central axis, the first cylindrical portion being inserted into a rotation hole formed in the blade;
A second cylindrical portion configured to be rotatable with respect to the main plate about an eccentric shaft at a position eccentric from a central axis of the first cylindrical portion;
A pin fixing hole for fixing the second cylindrical portion of the rotating pin is formed in the base plate,
The distance adjustment holding structure includes the first cylindrical portion of the rotating pin, the second cylindrical portion, and the pin fixing hole of the base plate.
The blade driving device according to claim 1.   The blade driving device according to claim 2, wherein the rotation pin further includes an operation unit that operates rotation of the second cylindrical portion with respect to the base plate. The electromagnetic actuator further includes a rotor that can rotate around the drive shaft, and a connecting portion that connects the rotor and the drive pin,
The drive pin of the electromagnetic actuator is
A cam portion that engages with the elongated hole formed in the blade;
A shaft portion that connects the cam portion and the connection portion, and a shaft portion that is configured to be rotatable with respect to the connection portion around an eccentric shaft that is eccentric from a central axis of the cam portion. Have
In the connection portion, a pin fixing hole for fixing the shaft portion of the drive pin is formed,
The distance adjustment holding structure includes the cam portion of the drive pin, the shaft portion, and the pin fixing hole of the connection portion.
The blade driving device according to claim 1.   The blade drive device according to claim 4, wherein the drive pin further includes an operation unit that operates rotation of the shaft portion with respect to the connection portion. The electromagnetic actuator further includes a rotor that can rotate around the drive shaft, and a connecting portion that connects the rotor and the drive pin,
The drive pin of the electromagnetic actuator is
A shaft portion inserted through an adjustment hole formed in the connection portion;
A cam portion connected to one end of the shaft portion and engaged with the elongated hole formed in the blade;
A fixing portion that is connected to the other end of the shaft portion and fixes the shaft portion and the cam portion to the connection portion;
The distance adjustment holding structure includes the shaft portion of the drive pin, the cam portion, the fixing portion, and the adjustment hole of the connection portion.
The blade drive device according to any one of claims 1 to 3.   The blade drive device according to claim 6, wherein the shaft portion and the fixed portion of the drive pin are configured to be screwed together.   The blade drive device according to claim 6 or 7, wherein the drive pin further includes an operation unit that operates movement of the drive pin with respect to the connection unit.   The blade drive device according to claim 3, 5, or 8, wherein the top portion of the operation unit is configured to be exposed to the outside in a window portion formed in a casing that houses the blade. An imaging surface on which light from the subject is incident;
The blade driving device according to any one of claims 1 to 9, wherein the blade driving device is disposed between the subject and the imaging surface;
A camera comprising: a lens module disposed between the subject and the imaging surface.

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