JPWO2019026450A1 - 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 has a magnet having a hole arranged along a central axis extending in one direction and a fixed surface facing one side in the axial direction. It is equipped with a blade body. A magnet is fixed to the fixed surface on one side in the axial direction of the blade body. The blade body has a through hole that penetrates the blade body in the axial direction. The inner diameter of the through hole is larger than the inner diameter of the hole. Seen along the axial direction, the through hole surrounds the radial outside of the hole. The magnet has a magnet main body fixed to a fixed surface by an adhesive, and a protruding portion protruding from the magnet main body to the other side in the axial direction. At least a portion of the protrusion is located radially inside the through hole. The hole is opened at the end of the protrusion on the other side in the axial direction. [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, which has a magnet having a hole arranged along a central axis extending in one direction and a fixed surface facing one side in the axial direction. The blade body is provided, and the magnet is fixed to the fixed surface on one side in the axial direction of the blade body, and the blade body has a through hole that penetrates the blade body in the axial direction. The inner diameter of the 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 magnet is fixed to the fixed surface by an adhesive. It has a magnet body and a protrusion protruding from the magnet body to the other side in the axial direction, and at least a part of the protrusion is arranged inside the through hole in the radial direction, and the hole is formed by the hole. It opens to the end of the protrusion on the other side in the axial direction.

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 of the present embodiment. FIG. 2 is a diagram showing a blade driving device of the present 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 present embodiment. FIG. 4 is a cross-sectional view showing a part of the procedure for assembling the light-shielding blade of the present embodiment. FIG. 5 is a perspective view showing an example of an embodiment of the imaging device. FIG. 6 is a perspective view showing an example of an embodiment of the imaging device. FIG. 7 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 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.

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.

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. 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.

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 has a magnet main body 31 and a protruding portion 32. The magnet body 31 has a substantially cylindrical shape centered on the central axis J. As shown in FIG. 1, the shape seen from the upper side of the magnet main body 31 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 body 31 has a pair of flat surfaces 30b as a part of the radial outer surface of the magnet body 31. The pair of flat surfaces 30b are provided on both side portions of the magnet body 31 with the central axis J in between. 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 projecting portion 32 projects downward from the magnet main body 31. The protruding portion 32 is a columnar shape centered on the central axis J. The outer diameter of the protruding portion 32 is smaller than the outer diameter of the magnet body 31. At least a part of the protrusion 32 is arranged radially inside the through hole 21c. In the present embodiment, almost the entire protruding portion 32 is arranged inside the through hole 21c in the radial direction.

The lower surface 32a, which is the lower end of the protrusion 32, is arranged radially inside the through hole 21c. As a result, the protruding portion 32 does not protrude below the blade main body 20, so that the axial dimension of the light-shielding blade 10 can be easily reduced. The lower surface 32a of the protrusion 32 is orthogonal to the axial direction. The lower surface 32a is arranged at the same position in the axial direction as the supported surface 21b, for example. In the present embodiment, the axial dimension of the protrusion 32 is substantially the same as the axial dimension of the blade body 20.

In the present embodiment, the portion of the protruding portion 32 arranged inside the through hole 21c in the radial direction is arranged at a position radially away from the radial inner side surface of the through hole 21c. That is, a gap is provided between the outer peripheral surface of the protruding portion 32 and the inner peripheral surface of the through hole 21c in the radial direction. The ratio of the outer diameter of the protruding portion 32 to the outer diameter of the magnet main body 31 is, for example, about 0.3 or more and 0.5 or less.

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, that is, the lower end of the protrusion 32. In the present embodiment, the hole portion 30a penetrates the magnet 30 in the axial direction. The hole 30a opens at the upper end of the magnet body 31 and the lower end of the protrusion 32. 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.

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 magnet 30 is fixed to the fixing surface 21a on the upper side of the blade body 20 by the adhesive 40. More specifically, the magnet body 31 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 radial outer edge of the lower surface 31a of the magnet body 31 comes into contact with the fixing surface 21a 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 main body 31 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 body 31 is the lower surface 31a of the magnet body 31. In the present embodiment, the first adhesive portion 41 adheres the radial outer edge portion at the lower end portion of the magnet main body 31 to the fixed surface 21a. The first adhesive portion 41 adheres the entire portions of the fixed surface 21a and the lower surface 31a of the magnet body 31 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 inner side surface of the through hole 21c in the radial direction to the lower end portion of the magnet body 31, that is, the lower surface 31a. 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 31a of the magnet main body 31.

The third adhesive portion 43 adheres the radial outer surface of the magnet main body 31 to the upper end portion of the blade main 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 on the outer side in the radial direction with respect to the magnet main body 31. That is, the third adhesive portion 43 is a portion protruding outward in the radial direction from between the axial direction of the fixed surface 21a and the lower surface 31a of the magnet main body 31.

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 a second adhesive portion 42 and a 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 jig F to support the blade body 20 from below. The operator brings the supported surface 21b into contact with the upper surface of the jig F to support the blade body 20 on the jig F. As a result, the blade body 20 is positioned in the axial direction. The jig F closes the opening on the lower side of the through hole 21c. 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 closer to the blade body 20 from above.

At this time, for example, the magnet 30 is positioned in the radial direction by pressing a pair of flat surfaces 30b against the 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, the operator inserts the protruding portion 32 into the through hole 21c in a state where the hole portion 30a and the through hole 21c are aligned along the central axis J, and the lower surface 31a of the magnet body 31 is formed. The radial outer edge is pressed against the fixing surface 21a via the uncured adhesive 44. At this time, the lower surface 32a of the protruding portion 32 inserted into the through hole 21c comes into contact with the upper surface of the jig F. As a result, the lower opening of the hole 30a is closed by the upper surface of the jig F.

When the magnet body 31 is pressed against the fixed surface 21a via the uncured adhesive 44, as shown by an arrow in FIG. 4, one of the uncured adhesives 44 sandwiched between the fixed surface 21a and the lower surface 31a. The part 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. As a result, the light-shielding blade 10 is assembled.

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. 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.

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, the magnet 30 has a protruding portion 32 arranged inside the through hole 21c in the radial direction. Then, the hole portion 30a opens at the lower end portion of the protruding portion 32. Therefore, the distance from the portion between the magnet main body 31 fixed by the adhesive 40 and the fixing surface 21a to the opening on the lower side of the hole 30a can be increased. 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.

Specifically, in order for the uncured adhesive 44 protruding inward of the through hole 21c in the radial direction to reach the hole 30a, the uncured adhesive 44 advances radially inward to the protruding portion 32. Further, it is necessary to wrap around the lower surface 32a of the protruding portion 32. Therefore, it is possible to prevent the uncured adhesive 44 from reaching the hole 30a.

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 using the jig F, the upper surface of the jig F comes into contact with the lower surface 32a of the protrusion 32, and is below the hole 30a that opens in the lower surface 32a of the protrusion 32. The opening on the side is closed. Therefore, the uncured adhesive 44 protruding inward in the radial direction of the through hole 21c can be blocked by the protruding portion 32, and the uncured adhesive 44 can be prevented from wrapping around the lower surface 32a of the protruding portion 32. As a result, it is possible to further prevent the uncured adhesive 44 from entering the hole 30a.

Further, according to the present embodiment, the portion of the protruding portion 32 arranged inside the through hole 21c in the radial direction is arranged at a position radially away from the radial inner side surface of the through hole 21c. As a result, a gap is provided between the outer peripheral surface of the protruding portion 32 and the inner peripheral surface of the through hole 21c in the radial direction. Therefore, 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.

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 31a of the magnet main body 31 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 31a of the magnet main body 31 can be adhered to each other, and the adhesive 40 can adhere to the magnet main body 31. The adhesive area with the blade body 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 a second adhesive portion 42 and a third adhesive portion 43 protruding from between the axial direction of the fixed surface 21a and the lower surface 31a of the magnet body 31 on both sides in the radial direction. Therefore, the entire portions of the fixed surface 21a and the lower surface 31a of the magnet body 31 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 main body 31 to the fixed surface 21a from being reduced. Therefore, the area of the magnet body 31 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, 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 fix the magnet 30 close to the blade body 20 with the columnar jig inserted in the hole 30a. In this case, since the hole 30a is closed by the columnar jig, it is possible to further prevent the uncured adhesive 44 from entering the hole 30a. Further, in this case, the magnet 30 can be positioned in the radial direction by the cylindrical jig. Further, for example, the light-shielding blade 10 may be assembled by an assembly robot.

The present invention is not limited to the above-described embodiment, 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 do not have to penetrate the magnet. 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 protruding portion may be a separate member from the magnet body. The outer diameter of the protrusion may be substantially the same as the inner diameter of the through hole. In this case, the radial outer surface of the protrusion may come into contact with the radial inner surface of the through hole. The lower end of the protruding portion may protrude below the through hole, or may be located above the supported surface of the blade body.

The structure of the adhesive is not particularly limited as long as the magnet body can be fixed to the fixing surface. The adhesive may not have any one or two of the first adhesive portion, the second adhesive portion, and the third adhesive portion. When the adhesive does not have a first adhesive portion, for example, the lower surface of the magnet body is in direct contact with the fixed surface. In this case, when the magnet is fixed to the blade body, the lower surface of the magnet body and the fixing surface can be brought into contact with each other without using an uncured adhesive, so that the magnet can be accurately positioned with respect to the blade body. 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.

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. 5 is an example of an infrared camera. The image pickup device 3 shown in FIG. 6 is an example of a digital camera. The image pickup device 4 shown in FIG. 7 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 above-described embodiment. 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 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 ... Shading blade, 20 ... Blade body, 21a ... Fixed surface, 21c ... Through hole, 30 ... Magnet, 30a ... Hole, 31 ... Magnet body, 32 ... Protruding part, 40, 44 ... Adhesive, 41 ... First adhesive part, 42 ... Second adhesive part, 50 ... Support pin, 60 ... Drive part, J ... Central axis

Claims (7)

A light-shielding blade for an image pickup device, the blade body having a magnet having a hole arranged along a central axis extending in one direction and a fixing surface facing one side in the axial direction, is provided on the fixed surface. The magnet is fixed on one side of the blade body in the axial direction, the blade body has a through hole that penetrates the blade body in the axial direction, and the inner diameter of the through hole is larger than the inner diameter of the hole. Also large, when viewed along the axial direction, the through hole surrounds the radial outside of the hole portion, and the magnet has a magnet body fixed to the fixing surface by an adhesive and an axial direction from the magnet body. It has a protrusion that projects to the other side, and at least a part of the protrusion is arranged radially inside the through hole, and the hole is located at the end of the protrusion on the other side in the axial direction. A light-shielding blade that opens. The light-shielding blade according to claim 1, wherein a portion of the protruding portion arranged inside the through hole in the radial direction is arranged at a position radially away from the radial inner side surface of the through hole. The light-shielding blade according to claim 1 or 2, wherein the end of the protrusion on the other side in the axial direction is arranged inside the through hole in the radial direction. The adhesive is a first adhesive portion that adheres the peripheral edge portion of the through hole and the other end portion of the magnet body on the axial direction of the blade body on one side in the axial direction, and the through hole. Any one of claims 1 to 3, having a second adhesive portion that is exposed inward in the radial direction and adheres the radial inner surface of the through hole and the end portion on the other side in the axial direction of the magnet body. The light-shielding blade described in. The light-shielding blade according to any one of claims 1 to 4, wherein the hole portion penetrates the magnet in the axial direction. A light-shielding blade according to any one of claims 1 to 5, 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 comprising the light-shielding blade according to any one of claims 1 to 5 or the blade driving device according to claim 6.

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