JPWO2019026449A1 - Shading blades, blade drive devices, and imaging devices - Google Patents

Abstract

One aspect of the light-shielding blade of the present invention is a light-shielding blade for an imaging device, which includes a blade body having a fixed surface and a magnet fixed to the fixed surface by an adhesive. One member of the blade body and the magnet is arranged along a central axis extending in one direction and has a hole portion penetrating the one member in the axial direction, and the other member of the blade body and the magnet. It is arranged on one side of the member in the axial direction. The other member has a through hole that penetrates the other member in the axial direction. The inner diameter of the through hole is larger than the inner diameter of the hole, and when viewed along the axial direction, the through hole surrounds the radial outside of the hole, and the adhesive is applied to one end of the other member in the axial direction. Of these, the first adhesive portion that adheres the peripheral edge of the through hole and the end of one member on the other side in the axial direction, and the radial inner surface of the through hole and one member that are exposed inside the through hole in the radial direction. It has a second adhesive portion for adhering to the other end portion in the axial direction of the above. [Selection diagram] Fig. 2

Description

The present invention relates to a light shielding blade, a blade driving device, and an imaging device.

Light-shielding blades for imaging devices are known. For example, Patent Document 1 describes a configuration in which a shutter blade as a light-shielding blade is rotated by using a rotor which is a permanent magnet.

Japanese Unexamined Patent Publication No. 2005-77765

In the above-mentioned light-shielding blades, it is conceivable to directly fix the permanent magnet to the blade body of the light-shielding blades by using an adhesive. In this case, for example, a hole into which a support pin is inserted is provided in at least one of the permanent magnet and the blade body, and the permanent magnet and the blade body are rotatably supported by the support pin.

When the above configuration is adopted, it is conceivable that the adhesive enters the hole when fixing the permanent magnet and the blade body. If an adhesive enters the hole, the adhesive may hinder the relative rotation of the permanent magnet and the blade body with respect to the support pin, and the light-shielding blade may not operate properly. Therefore, the yield of the light-shielding blades may decrease.

In view of the above circumstances, the present invention includes a blade body, a light-shielding blade provided with a magnet fixed to the blade body with an adhesive and having a structure capable of improving yield, a blade drive device provided with such a light-shielding blade, and the like. One of the objects is to provide an image pickup device provided with a light-shielding blade or a blade driving device.

One aspect of the light-shielding blade of the present invention is a light-shielding blade for an imaging device, comprising a blade body having a fixed surface and a magnet fixed to the fixed surface by an adhesive, and the blade body and the blade body. One member of the magnet has a hole that is arranged along a central axis extending in one direction and penetrates the one member in the axial direction, and the other of the blade body and the magnet. The other member has a through hole that penetrates the other member in the axial direction, and the inner diameter of the through hole is larger than the inner diameter of the hole portion. Seen along the direction, the through hole surrounds the radially outer side of the hole, and the adhesive is applied to the peripheral edge of the through hole and one of the axially one end of the other member. The first adhesive portion that adheres the end portion on the other side in the axial direction of the member, and the radial inner surface of the through hole and the other side in the axial direction of the one member that are exposed inside the through hole. It has a second adhesive portion that adheres to the end portion.

One aspect of the blade drive device of the present invention is to generate the light-shielding blade, a support pin that is inserted into the hole and rotatably supports the light-shielding blade around the central axis, and a magnetic field that passes through the magnet. A drive unit for rotating the light-shielding blade around the central axis is provided.

One aspect of the image pickup apparatus of the present invention includes the above-mentioned light-shielding blade or the above-mentioned blade drive device.

According to one aspect of the present invention, a light-shielding blade having a blade body and a magnet fixed to the blade body with an adhesive and having a structure capable of improving yield, a blade drive device including such a light-shielding blade, and the like. An imaging device including a light-shielding blade or a blade driving device is provided.

FIG. 1 is a schematic configuration diagram showing a blade driving device according to the first embodiment. FIG. 2 is a diagram showing a blade driving device according to the first embodiment, and is a sectional view taken along line II-II in FIG. FIG. 3 is a cross-sectional view showing a part of the procedure for assembling the light-shielding blade of the first embodiment. FIG. 4 is a cross-sectional view showing a part of the procedure for assembling the light-shielding blade of the first embodiment. FIG. 5 is a cross-sectional view showing a part of another assembling procedure for the light-shielding blade of the first embodiment. FIG. 6 is a cross-sectional view showing a part of the procedure for assembling the light-shielding blade of the second embodiment. FIG. 7 is a perspective view showing an example of an embodiment of the imaging device. FIG. 8 is a perspective view showing an example of an embodiment of the imaging device. FIG. 9 is a perspective view showing an example of an embodiment of the imaging device.

The Z-axis direction appropriately shown in each figure is a direction parallel to the vertical direction. The positive side in the Z-axis direction is defined as the "upper side", and the negative side in the Z-axis direction is defined as the "lower side". Further, the central axis J appropriately shown in each figure extends in the Z-axis direction, that is, in the vertical direction. In the following description, the axial direction of the central axis J, that is, the vertical direction parallel to the Z-axis direction is simply referred to as "axial direction". Further, the radial direction centered on the central axis J is simply referred to as "diametrical direction", and the circumferential direction centered on the central axis J is simply referred to as "circumferential direction".

In each of the following embodiments, the upper side in the axial direction corresponds to one side in the axial direction. The lower side corresponds to the other side in the axial direction. It should be noted that the vertical direction, the upper side, and the lower side are simply names for explaining the relative positional relationship of each part, and the actual arrangement relationship, etc. is an arrangement relationship, etc. other than the arrangement relationship, etc. indicated by these names. You may.

<First Embodiment> The blade driving device 1 of the present embodiment shown in FIGS. 1 and 2 is mounted on an imaging device. The blade drive device 1 is, for example, a shutter device mounted on an infrared camera among image pickup devices. The blade driving device 1 includes a main plate 1a, a light-shielding blade 10, a support pin 50, and a driving unit 60. The main plate 1a supports the light-shielding blade 10. The main plate 1a has an opening 1b that penetrates the main plate 1a in the axial direction. The opening 1b is an opening for exposure.

The light-shielding blade 10 of the present embodiment is a light-shielding blade for an imaging device, for example, a shutter blade of an infrared camera. The light-shielding blade 10 rotates around the central axis J and is switched between an open state in which the opening 1b shown by the alternate long and short dash line in FIG. 1 is exposed and a closed state in which the opening 1b shown in the solid line in FIG. 1 is covered. In the closed state, the light-shielding blade 10 blocks the exposure light passing through the opening 1b. The light-shielding blade 10 includes a blade body 20 and a magnet 30.

One member of the blade body 20 and the magnet 30 is arranged above the other member of the blade body 20 and the magnet 30. In this embodiment, the magnet 30 is arranged above the blade body 20. That is, in the present embodiment, one member is a magnet 30, and the other member is a blade body 20.

The blade body 20 has a plate shape extending in the radial direction. As shown in FIG. 1, the blade main body 20 has a supported portion 21 and a blade portion 22. The shape of the supported portion 21 as viewed from above is, for example, a square shape. The upper surface of the supported portion 21 is a fixed surface 21a. That is, the blade main body 20 has a fixed surface 21a facing upward. The fixed surface 21a is orthogonal to the axial direction. The lower surface of the supported portion 21 is a supported surface 21b. The supported surface 21b is orthogonal to the axial direction. The blade portion 22 extends radially outward from the supported portion 21. The shape of the blade portion 22 viewed from above is, for example, a rectangular shape long in the radial direction.

As shown in FIG. 2, the blade main body 20 has a through hole 21c that penetrates the blade main body 20 in the axial direction. In the present embodiment, the through hole 21c penetrates the supported portion 21 in the axial direction. The cross-sectional shape orthogonal to the axial direction of the through hole 21c is, for example, a circular shape centered on the central axis J.

The magnet 30 has a substantially cylindrical shape centered on the central axis J. In this embodiment, the magnet 30 is a single member. The magnet 30 has an north pole and an south pole as two different magnetic poles. The north pole and the south pole are arranged side by side along a predetermined direction orthogonal to the axial direction. For example, the portion of the magnet 30 on one side in the predetermined direction from the central axis J is the north pole, and the portion of the magnet 30 on the other side in the predetermined direction from the central axis J is the south pole. The north pole and the south pole are arranged with the central axis J in between. The magnet 30 is fixed to the fixing surface 21a on the upper side of the blade body 20 by the adhesive 40. The lower surface of the magnet 30 comes into contact with the fixed surface 21a.

As shown in FIG. 1, the shape seen from the upper side of the magnet 30 is a shape in which both side portions of the circle centered on the central axis J with the central axis J sandwiched in the radial direction are cut out. As a result, the magnet 30 has a pair of flat surfaces 30b as a part of the radial outer surface of the magnet 30. The pair of flat surfaces 30b are provided on both side portions of the magnet 30 with the central axis J interposed therebetween. The flat surface 30b is a flat surface orthogonal to the radial direction. The pair of flat surfaces 30b are parallel to each other. In the present embodiment, the pair of flat surfaces 30b are parallel to the predetermined direction in which the north and south poles of the magnet 30 are aligned.

As shown in FIG. 2, the magnet 30 has a hole portion 30a arranged along a central axis J extending in the axial direction. The hole 30a is recessed upward from the lower end of the magnet 30. In the present embodiment, the hole portion 30a penetrates the magnet 30 in the axial direction. As shown in FIG. 1, the cross-sectional shape of the hole 30a orthogonal to the central axis J is a circular shape centered on the central axis J. Examples of the material of the blade main body 20 include a metal such as aluminum and a resin such as polyethylene terephthalate (PET: polyethylene terephthalate). The material of the blade main body 20 can be appropriately selected according to the use of the light-shielding blade 10. In the case of a light-shielding blade for an infrared camera such as the light-shielding blade 10 of the present embodiment, for example, aluminum is used as the material of the blade body. When the light-shielding blade is a shutter blade for a digital camera or a film camera, polyethylene terephthalate is used as the material of the blade body.

As shown in FIG. 2, the inner diameter D2 of the hole 30a is smaller than, for example, the inner diameter D1 of the through hole 21c. In other words, the inner diameter D1 of the through hole 21c is larger than the inner diameter D2 of the hole 30a. The ratio of the inner diameter D1 of the through hole 21c to the inner diameter D2 of the hole 30a is, for example, about 1.5 or more and 5 or less. The entire hole 30a is located inside the through hole 21c when viewed along the axial direction and overlaps the through hole 21c. That is, when viewed along the axial direction, the through hole 21c surrounds the radial outside of the hole portion 30a. The through hole 21c is connected to the hole portion 30a.

The magnet 30 is fixed to the fixing surface 21a by the adhesive 40. As a result, the blade body 20 and the magnet 30 are adhered and fixed via the adhesive 40. The adhesive 40 is a portion formed by curing the uncured adhesive 44.

The adhesive 40 has a first adhesive portion 41, a second adhesive portion 42, and a third adhesive portion 43. The first adhesive portion 41 adheres the peripheral edge portion of the through hole 21c and the lower end portion of the magnet 30 among the upper end portions of the blade main body 20. In the present embodiment, the upper end of the blade body 20 is a fixed surface 21a. The lower end of the magnet 30 is the lower surface 30c of the magnet 30. In the present embodiment, the first adhesive portion 41 adheres the radial outer edge portion at the lower end portion of the magnet 30 to the fixed surface 21a. The first adhesive portion 41 adheres the entire portions of the fixed surface 21a and the lower surface 30c of the magnet 30 that face each other in the axial direction. The first adhesive portion 41 is, for example, an annular shape centered on the central axis J.

The second adhesive portion 42 is exposed inside the through hole 21c in the radial direction, and adheres the radial inner surface of the through hole 21c to the lower end portion of the magnet 30, that is, the lower surface 30c. The second adhesive portion 42 is, for example, an annular shape centered on the central axis J. The second adhesive portion 42 is a portion that protrudes inward in the radial direction from the axial direction between the fixed surface 21a and the lower surface 30c of the magnet 30.

The third adhesive portion 43 adheres the radial outer surface of the magnet 30 to the upper end portion of the blade body 20, that is, the fixed surface 21a. The third adhesive portion 43 is, for example, an annular shape centered on the central axis J. The third adhesive portion 43 is a portion located radially outside the magnet 30. That is, the third adhesive portion 43 is a portion protruding outward in the radial direction from the axial direction between the fixed surface 21a and the lower surface 30c of the magnet 30.

The adhesive 40 is, for example, an ultraviolet curable adhesive. As a result, the time required for the uncured adhesive 44 to cure can be shortened as compared with a thermosetting adhesive or the like. Further, since it is not necessary to heat the uncured adhesive 44 when it is cured, it is possible to prevent the magnet 30 from being demagnetized. Since the adhesive 40 has the second adhesive portion 42 and the third adhesive portion 43 protruding in the radial direction, it is easy to irradiate the uncured adhesive 44 with ultraviolet rays.

As shown in FIG. 3, the operator assembling the light-shielding blade 10 causes the first jig F1 to support the blade main body 20 from below. The first jig F1 has a jig through hole F1a that penetrates the first jig F1 in the axial direction. The inner diameter of the jig through hole F1a is larger than the inner diameter D1 of the through hole 21c. The operator brings the supported surface 21b into contact with the upper surface of the first jig F1 in a state where the jig through hole F1a surrounds the radial outside of the through hole 21c when viewed along the axial direction, and the blade body 20 is moved. It is supported by the first jig F1. As a result, the blade body 20 is positioned in the axial direction.

Next, the operator applies the uncured adhesive 44 to the peripheral edge of the through hole 21c on the fixed surface 21a over the entire circumference. Then, the operator brings the magnet 30 in the state where the second jig F2 is passed through the hole 30a closer to the blade main body 20 from above. The second jig F2 has a columnar shape extending in the axial direction and is fitted into the hole portion 30a. The axial dimension of the second jig F2 is larger than the axial dimension of the magnet 30. The magnet 30 is positioned in the radial direction by the second jig F2.

The magnet 30 may be positioned in the radial direction by, for example, a pair of flat surfaces 30b being pressed against a jig. In this case, since the flat surface 30b is parallel to the predetermined direction in which the north and south poles of the magnet 30 are aligned, the direction of the magnetic poles of the magnet 30 is changed by positioning the magnet 30 using the flat surface 30b. It can be accurately matched to the main body 20.

As shown in FIG. 4, in a state where the hole portion 30a and the through hole 21c are aligned along the central axis J, the operator passes the radial outer edge portion of the lower surface 30c of the magnet 30 via the uncured adhesive 44. Press against the fixed surface 21a. As a result, as shown by an arrow in FIG. 4, a part of the uncured adhesive 44 sandwiched between the fixed surface 21a and the lower surface 30c is extruded to both sides in the radial direction. Therefore, the uncured adhesive 44 protrudes inside the through hole 21c in the radial direction and outside the magnet 30 in the radial direction. Then, the operator irradiates the uncured adhesive 44 with ultraviolet rays. As a result, the uncured adhesive 44 is cured to become the adhesive 40. Therefore, the adhesive 40 having the first adhesive portion 41, the second adhesive portion 42, and the third adhesive portion 43 can be obtained, and the magnet 30 and the blade main body 20 can be fixed. After curing the uncured adhesive 44, the operator pulls out the second jig F2 from the hole 30a. As a result, the light-shielding blade 10 is assembled. The operator may remove the second jig F2 from the hole 30a before curing the uncured adhesive 44.

When the magnet 30 is pressed against the fixed surface 21a, the lower end of the second jig F2 is arranged below the blade body 20 through the through hole 21c. The lower end of the second jig F2 is arranged inside the jig through hole F1a in the radial direction. A gap is provided between the outer peripheral surface of the second jig F2 and the inner peripheral surface of the through hole 21c in the radial direction. As a result, the uncured adhesive 44 can escape to this gap, and it is possible to further prevent the uncured adhesive 44 from reaching the hole 30a.

As shown in FIG. 2, the support pin 50 is a columnar shape extending in the axial direction about the central axis J. The lower end of the support pin 50 is fixed to, for example, a housing of a blade driving device 1 (not shown). The support pin 50 is inserted into the hole 30a from the lower side of the blade body 20 via the through hole 21c. The support pin 50 rotatably supports the light-shielding blade 10 around the central axis J. In FIG. 2, the upper end portion of the support pin 50 is arranged at the same position in the axial direction as the upper surface of the magnet 30, for example. When the light-shielding blade 10 rotates, the inner peripheral surface of the hole 30a moves relative to the outer peripheral surface of the support pin 50 in the circumferential direction while sliding, for example. The portion of the support pin 50 to be inserted into the through hole 21c is in a state of being arranged radially inward from the inner peripheral surface of the through hole 21c.

In FIG. 2, the support pin 50 is inserted from the lower side of the hole 30a, but the present invention is not limited to this. In the present embodiment, since the hole portion 30a penetrates the magnet 30 in the axial direction, the support pin 50 can be inserted from above the hole portion 30a. Therefore, the light-shielding blade 10 can be supported by the support pin 50 in a state where the posture of the light-shielding blade 10 is reversed in the axial direction with respect to the posture shown in FIG. Therefore, the blade drive device 1 can be easily assembled.

The drive unit 60 generates a magnetic field passing through the magnet 30 to rotate the light-shielding blade 10 around the central axis J. The drive unit 60 has a pair of coils 61 arranged so as to sandwich the magnet 30 in a direction orthogonal to the axial direction, and a yoke (not shown) on which the coils 61 are mounted.

A current is supplied to the coil 61 from the power supply 70 shown in FIG. As a result, a magnetic field is generated between the pair of coils 61. The magnetic field generated by the coil 61 and the magnetic field generated by the magnet 30 generate a magnetic force in the magnet 30 that rotates the magnet 30 around the central axis J. Therefore, the drive unit 60 can rotate the magnet 30, and the light-shielding blade 10 fixed to the magnet 30 can be rotated around the central axis J. As a result, the light-shielding blade 10 can be switched between the open state and the closed state.

In the present embodiment, the light-shielding blade 10 is maintained in the open state shown by the alternate long and short dash line in FIG. 1 in a state where no current is supplied to the coil 61. At this time, the light-shielding blade 10 is maintained in an open state by the magnetic force of the magnet 30. On the other hand, when a current is supplied to the coil 61, the light-shielding blade 10 rotates around the central axis J and becomes a closed state shown by a solid line in FIG. Then, when the supply of the current to the coil 61 is stopped, the light-shielding blade 10 is rotated in the reverse direction around the central axis J by the magnetic force of the magnet 30, and is opened again.

The light-shielding blade 10 may be maintained in a closed state in a state where no current is supplied to the coil 61. In this case, when a current is supplied to the coil 61, the light-shielding blade 10 is switched to the open state.

According to the present embodiment, since the inner diameter D1 of the through hole 21c is larger than the inner diameter D2 of the hole 30a, the radial inner edge of the through hole 21c is arranged radially outward from the radial inner edge of the hole 30a. Can be done. As a result, when the above-mentioned method for assembling the light-shielding blade 10 is adopted, even if the uncured adhesive 44 protrudes inside the through hole 21c in the radial direction, the protruding uncured adhesive 44 reaches the hole 30a. Can be suppressed. Therefore, it is possible to prevent the uncured adhesive 44 from entering the hole 30a. As a result, it is possible to prevent the relative rotation of the magnet 30 with respect to the support pin 50 from being hindered, and a light-shielding blade 10 that operates favorably can be obtained. In addition, it is possible to prevent the insertion of the support pin 50 into the hole portion 30a from being hindered.

Therefore, it is possible to prevent the manufactured light-shielding blade 10 from becoming a defective product, and it is possible to improve the yield of the light-shielding blade 10. Further, by obtaining the light-shielding blade 10 that operates suitably, the blade driving device 1 having excellent reliability can be obtained.

Further, as described above, when the light-shielding blade 10 is assembled by passing the second jig F2 through the hole 30a, the hole 30a is closed by the second jig F2. Therefore, even when the uncured adhesive 44 reaches the vicinity of the hole 30a, the second jig F2 can prevent the uncured adhesive 44 from entering the hole 30a. As a result, it is possible to further prevent the uncured adhesive 44 from entering the hole 30a. Further, even when the uncured adhesive 44 reaches the second jig F2 and adheres to the second jig F2, the second jig F2 is moved downward relative to the magnet 30. By pulling it out from the hole 30a, the excess adhesive 44 together with the second jig F2 is removed while suppressing the uncured adhesive 44 adhering to the second jig F2 from entering the hole 30a. be able to.

Further, when the inner diameter D1 of the through hole 21c is larger than the inner diameter D2 of the hole portion 30a, the areas of the fixed surface 21a and the lower surface 30c of the magnet 30 that face each other in the axial direction tend to be small. However, according to the present embodiment, since the adhesive 40 has the second adhesive portion 42, the inner side surface in the radial direction of the through hole 21c and the lower surface 30c of the magnet 30 can be adhered to each other, and the magnet 30 and the blade body by the adhesive 40 can be bonded. The adhesive area with 20 can be increased. As a result, the inner diameter D1 of the through hole 21c is made larger than the inner diameter D2 of the hole 30a to prevent the uncured adhesive 44 from entering the hole 30a, and the adhesive strength between the magnet 30 and the blade body 20 is increased. Can be secured.

Further, according to the present embodiment, since the adhesive 40 has the third adhesive portion 43, the radial outer surface of the magnet 30 and the fixed surface 21a can be adhered to each other, and the magnet 30 and the blade body 20 are bonded by the adhesive 40. The adhesive area can be made larger. As a result, the inner diameter D1 of the through hole 21c is made larger than the inner diameter D2 of the hole 30a to prevent the uncured adhesive 44 from entering the hole 30a, and the adhesive strength between the magnet 30 and the blade body 20 is increased. More can be secured.

Further, as in the present embodiment, the adhesive 40 has the second adhesive portion 42 and the third adhesive portion 43 protruding from the axial direction between the fixed surface 21a and the lower surface 30c of the magnet 30 on both sides in the radial direction. The entire portions of the fixed surface 21a and the lower surface 30c of the magnet 30 that face each other in the axial direction are easily adhered by the first adhesive portion 41. As a result, it is possible to prevent the amount of the first adhesive portion 41 that adheres the magnet 30 to the fixed surface 21a from being reduced. Therefore, the area of the magnet 30 to which the adhesive 40 adheres can be increased, and the magnet 30 can be firmly fixed to the blade body 20. Further, it is easy to control the amount of the uncured adhesive 44 applied when the magnet 30 and the blade main body 20 are adhered to each other.

Further, according to the present embodiment, one member having the hole 30a is the magnet 30, and the other member having the through hole 21c is the blade body 20. Therefore, the support pin 50 can be inserted into the hole 30a, and the magnet 30 can be directly supported by the support pin 50. As a result, the light-shielding blade 10 can be stably supported by the support pin 50.

Further, according to the present embodiment, since the magnet 30 is directly fixed to the blade main body 20, a separate member for connecting the magnet 30 and the blade main body 20 is not required. Therefore, the number of parts of the blade driving device 1 can be reduced. In addition, the blade driving device 1 can be easily miniaturized.

The worker who assembles the light-shielding blade 10 may assemble the light-shielding blade 10 by using a method other than the above-mentioned assembly method. For example, the operator may assemble the light-shielding blade 10 using the third jig F3 shown in FIG. As shown in FIG. 5, the third jig F3 has a blade main body support portion F3a and a magnet support portion F3b. The blade body support portion F3a supports the blade body 20 from below. The upper surface of the blade body support portion F3a comes into contact with the supported surface 21b.

The magnet support portion F3b projects upward from the upper surface of the blade body support portion F3a. The magnet support portion F3b is, for example, a columnar shape centered on the central axis J. The outer diameter of the magnet support portion F3b is smaller than the inner diameter D1 of the through hole 21c and larger than the inner diameter D2 of the hole portion 30a. The magnet support portion F3b is arranged inside the through hole 21c in the radial direction. A gap is provided between the outer peripheral surface of the magnet support portion F3b and the inner peripheral surface of the through hole 21c in the radial direction. As a result, the uncured adhesive 44 can escape to this gap, and it is possible to further prevent the uncured adhesive 44 from reaching the hole 30a. The upper surface of the magnet support portion F3b supports the lower surface 30c of the magnet 30 from below.

The magnet support portion F3b closes the opening on the lower side of the hole portion 30a. As a result, the uncured adhesive 44 protruding inward in the radial direction of the through hole 21c can be blocked by the magnet support portion F3b. Therefore, it is possible to further prevent the uncured adhesive 44 from entering the hole 30a. Further, in this method, the hole portion 30a
The outer peripheral surface of the magnet support portion F3b that blocks the uncured adhesive 44 can be arranged radially outward from the inner peripheral surface of the hole portion 30a, as compared with the case where the second jig F2 is passed through. Therefore, the magnet support portion F3b can block the uncured adhesive 44 at a position far from the hole portion 30a, and can further prevent the uncured adhesive 44 from entering the hole portion 30a.

For example, the light-shielding blade 10 may be assembled by an assembly robot.

<Second Embodiment> As shown in FIG. 6, in the light-shielding blade 110 of the present embodiment, the blade main body 120 is arranged above the magnet 130. That is, in the present embodiment, one member is the blade body 120, and the other member is the magnet 130. The blade body 120 has a hole 121c arranged along the central axis J. The hole portion 121c is recessed upward from the lower surface of the supported portion 121 among the lower end portions of the blade main body 120. The hole 121c penetrates the blade body 120 in the axial direction. The lower surface of the supported portion 121 is a fixed surface 121b. The fixed surface 121b faces downward in the axial direction.

In the present embodiment, the support pin 50 is inserted into the hole 121c to support the blade body 120. More specifically, the support pin 50 is fitted into the hole 121c to support the blade body 120. Although not shown, the support pin 50 is inserted into the hole 121c from above in the present embodiment. Further, in the blade driving device provided with the light-shielding blade 110 of the present embodiment, the main plate 1a is located above the blade main body 120. That is, the posture of the light-shielding blade 110 shown in FIG. 6 is the posture when the blade driving device is provided with the posture opposite to that of the blade driving device 1 shown in FIGS. 1 and 2 in the Z-axis direction. is there.

The magnet 130 has a through hole 130a that penetrates the magnet 130 in the axial direction. The inner diameter D4 of the through hole 130a is larger than the inner diameter D3 of the hole 121c. Seen along the axial direction, the through hole 130a surrounds the radial outside of the hole 121c.

The adhesive 140 has a first adhesive portion 141, a second adhesive portion 142, and a third adhesive portion 143. The first adhesive portion 141 adheres the peripheral edge portion of the through hole 130a and the lower end portion of the blade body 120 among the upper end portions of the magnet 130. In the present embodiment, the peripheral edge of the through hole 130a among the upper end of the magnet 130 is the entire upper surface 130d of the magnet 130. The lower end of the blade body 120 is a fixed surface 121b. The first adhesive portion 141 adheres the entire portions of the fixed surface 121b and the upper surface 130d of the magnet 130 that face each other in the axial direction.

The second adhesive portion 142 is exposed inside the through hole 130a in the radial direction, and adheres the radial inner surface of the through hole 130a to the lower end portion of the blade body 120, that is, the fixed surface 121b. The second adhesive portion 142 is a portion that protrudes inward in the radial direction from the axial direction between the fixed surface 121b and the upper surface 130d of the magnet 130.

The third adhesive portion 143 adheres the radial outer surface of the magnet 130 to the lower end portion of the blade body 120, that is, the fixed surface 121b. The third adhesive portion 143 is a portion located radially outside the magnet 130. That is, the third adhesive portion 143 is a portion that protrudes radially outward from between the axial direction of the fixed surface 121b and the upper surface 130d of the magnet 130.

According to the present embodiment, since the inner diameter D4 of the through hole 130a is larger than the inner diameter D3 of the hole portion 121c as in the first embodiment, the radial inner edge of the through hole 130a is the diameter from the radial inner edge of the hole portion 121c. It can be placed apart from the outside in the direction. As a result, it is possible to prevent the uncured adhesive from entering the hole 121c. Therefore, it is possible to prevent the manufactured light-shielding blade 110 from becoming a defective product, and it is possible to improve the yield of the light-shielding blade 110.

FIG. 6 shows a state in which the light-shielding blade 110 is assembled using the fourth jig F4. The fourth jig F4 has a magnet support portion F4a and a blade body support portion F4b. The magnet support portion F4a supports the magnet 130 from below. The upper surface of the magnet support portion F4a comes into contact with the supported surface 130c, which is the lower surface of the magnet 130.

The blade body support portion F4b projects upward from the upper surface of the magnet support portion F4a. The blade body support portion F4b is, for example, a columnar shape centered on the central axis J. The outer diameter of the blade body support portion F4b is smaller than the inner diameter D4 of the through hole 130a and larger than the inner diameter D3 of the hole portion 121c. The blade body support portion F4b is arranged inside the through hole 130a in the radial direction. A gap is provided between the outer peripheral surface of the blade body support portion F4b and the inner peripheral surface of the through hole 130a in the radial direction. As a result, the uncured adhesive can escape into this gap, and it is possible to further prevent the uncured adhesive from reaching the hole 121c. The upper surface of the blade body support portion F4b supports the fixed surface 121b, which is a part of the lower surface of the blade body 120, from below. The blade body support portion F4b closes the opening on the lower side of the hole portion 121c.

As a result, the uncured adhesive that protrudes inward in the radial direction of the through hole 130a can be blocked by the blade body support portion F4b. Therefore, it is possible to further prevent the uncured adhesive from entering the hole 121c. The light-shielding blade 110 of the present embodiment may be assembled by adopting a method of passing a jig similar to the second jig F2 shown in FIGS. 3 and 4 through the hole 121c of the blade main body 120.

The present invention is not limited to each of the above-described embodiments, and other configurations may be adopted. The blade body is not particularly limited as long as it has a fixed surface. The holes provided in the magnet or the blade body do not have to penetrate the magnet or the blade body. For example, when the hole portion is provided in the blade body as in the second embodiment, the blade body having a relatively large thickness of the supported portion in the blade body may be used as the blade body, or the overall thickness may be used. A blade body having a relatively large size may be used. The magnet may be configured by connecting a plurality of magnets. The shape of the magnet is not particularly limited, and may be a polygonal column such as a hexagonal column or an elliptical column. The type of adhesive is not particularly limited as long as the blade body and the magnet can be adhered to each other. The adhesive may be a thermosetting adhesive. The adhesive does not have to have a portion located radially outside the magnet, that is, a third adhesive portion.

When fixing the magnet and the blade body, after applying an uncured adhesive to the magnet, the magnet may be brought into contact with the fixing surface to fix the magnet and the blade body. Further, after applying an uncured adhesive to both the magnet and the fixing surface, the magnet may be brought into contact with the fixing surface to fix the magnet and the blade body. Instead of the adhesive, an adhesive sheet (adhesive tape) may be used to fix the blade body and the magnet.

Further, the light-shielding blade is not particularly limited as long as it is a light-shielding blade for an imaging device. The light-shielding blade may be, for example, a filter blade or a diaphragm blade. Further, the blade driving device is not particularly limited as long as it includes light-shielding blades, and may be a diaphragm device or the like.

<Embodiment of Imaging Device> The imaging device 2 shown in FIG. 7 is an example of an infrared camera. The image pickup device 3 shown in FIG. 8 is an example of a digital camera. The image pickup device 4 shown in FIG. 9 is an example of a portable information terminal having an image pickup function. The image pickup device 4 is, for example, a smartphone.

The image pickup device 2, the image pickup device 3, and the image pickup device 4 each include the blade drive device 1 of the first embodiment described above. In the image pickup device 2, the image pickup device 3, and the image pickup device 4, the blade drive device 1 is an image pickup element built in each image pickup device. The image pickup device 2, the image pickup device 3, and the image pickup device 4 each include a lens located in front of the blade drive device 1, a processing circuit for processing the captured image, a memory, and the like. For example, the blade driving device 1 as an image pickup element provided in a smartphone such as the image pickup device 4 may be an image pickup element retrofitted to the smartphone.

The blade drive device mounted on the image pickup device 2 and the image pickup device 3 may be a blade drive device including the light-shielding blade 110 of the second embodiment described above. The image pickup device is not particularly limited, and may be a single-lens reflex camera or a mobile information terminal having an image pickup function other than a smartphone.

The configurations described above can be appropriately combined within a range that does not contradict each other.

1 ... Blade drive device, 2,3,4 ... Imaging device, 10,110 ... Shading blade, 20,120 ... Blade body, 21a, 121b ... Fixed surface, 21c, 130a ... Through hole, 30,130 ... Magnet, 30a , 121c ... Hole, 40, 44, 140 ... Adhesive, 41, 141 ... First adhesive, 42, 142 ... Second adhesive, 50 ... Support pin, 60 ... Drive, J ... Central axis

Claims (6)

A light-shielding blade for an image pickup device, comprising a blade body having a fixed surface and a magnet fixed to the fixed surface by an adhesive, and one member of the blade body and the magnet is one. It has a hole portion arranged along a central axis extending in the direction, and is arranged on one side in the axial direction of the other member of the blade body and the magnet, and the other member is the other member. It has a through hole that penetrates the member in the axial direction, and the inner diameter of the through hole is larger than the inner diameter of the hole portion, and when viewed along the axial direction, the through hole is on the radial outside of the hole portion. Enclosing, the adhesive is a first adhesive portion that adheres the peripheral edge portion of the through hole and the other end portion of the one member in the axial direction among the end portions on one side in the axial direction of the other member. A light-shielding blade having a second adhesive portion that is exposed inside the through hole in the radial direction and adheres the inner side surface in the radial direction of the through hole and the end portion on the other side in the axial direction of the one member. The light-shielding blade according to claim 1, wherein the one member is the magnet, and the other member is the blade body. The light-shielding blade according to claim 1 or 2, wherein the hole portion penetrates the one member in the axial direction. The light-shielding blade according to claim 1, wherein the one member is the blade body, and the other member is the magnet. A light-shielding blade according to any one of claims 1 to 4, a support pin inserted into the hole and rotatably supporting the light-shielding blade around the central axis, and a magnetic field passing through the magnet are generated. A blade drive device including a drive unit that rotates the light-shielding blade around the central axis. An imaging device including the light-shielding blade according to any one of claims 1 to 4 or the blade driving device according to claim 5.

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