Imaging apparatus

Abstract

To suppress enlargement of an apparatus and ensure smooth movement of a movable part and high coolability of an imaging element.SOLUTION: A stationary portion 340 supports a movable portion 330 holding an imaging element 311 to be movable in a direction orthogonal to an optic axis C1. The movable portion 330 is controlled within the scope of +W to -W relative to a neutral position. A heat dissipation member 400 that is flexible is connected to the movable portion 330 by a first connection N1 and is connected to the stationary portion 340 by a second connection N2. At least part of a deformation part 410 of the heat dissipation member 400 is positioned between the movable portion 330 and the stationary portion 340 in the direction of the optic axis C1. Load reduction parts (slide members 336, 345) are provided on the movable portion 330 and the stationary portion 340. The load reduction parts encompass a scope 1 from a position POS4 (first position) to a position POS6 (second position) with reference to an end position A in the movement direction of the movable portion 330.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an imaging device. [Background technology]

[0002] Imaging devices such as digital still cameras and video cameras are equipped with imaging elements such as CMOS sensors and CCD sensors for capturing subject images, as well as electronic elements such as CPUs and ICs mounted on circuit boards, which generate heat. If the temperature of the imaging elements or electronic elements rises excessively, their performance may deteriorate or malfunction, making it impossible to capture good images.

[0003] In recent years, imaging devices that correct shake by moving the image sensor in a direction perpendicular to the optical axis have become popular in order to improve image quality. Even in imaging devices that perform shake correction, sufficient heat dissipation is required because heat generated in the image sensor during operation of the shake correction mechanism, continuous shooting, and video shooting affects image quality. Meanwhile, care must be taken to ensure that the smooth movement of the moving parts is not impeded when controlling their drive.

[0004] Patent Document 1 discloses a device in which the thickness of a bendable heat transfer member connecting a movable part and a fixed part in an image stabilization mechanism is oriented perpendicular to the optical axis, thereby suppressing twisting of the heat transfer member and reducing the load on the image stabilization mechanism.

[0005] Furthermore, Patent Document 2 discloses a device that determines a via position for the movement of a movable part in driving an image blur correction mechanism, and has good controllability even when it has a heat transfer member that is subjected to a load. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] WO2020 / 202811 publication [Patent Document 2] Patent Publication No. 2021-189225 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the technology of Patent Document 1, the thickness of the heat transfer member is set in the direction perpendicular to the optical axis, so in order to increase the amount of heat transfer, it is necessary to increase the number of heat transfer members or widen the width of the heat transfer members, which raises concerns about an increased load on the image stabilization mechanism and an increase in the size of the image stabilization mechanism.

[0008] On the other hand, in the technology of Patent Document 2, since the via position is determined, there is a concern that the responsiveness of the image blur correction mechanism may decrease.

[0009] Therefore, there is room for improvement in terms of suppressing the expansion of the device, smooth movement of the movable parts, and improving the cooling performance of the imaging element.

[0010] The present invention aims to ensure smooth movement of the movable parts and good cooling of the imaging element while suppressing the enlargement of the device. [Means for solving the problem]

[0011] In order to achieve the above object, an imaging device of the present invention includes a movable section that holds an imaging element, a fixed section that holds the movable section so that the movable section is movable in a direction perpendicular to an imaging optical axis, a control means that controls movement of the movable section within a range from +W to -W with respect to a neutral position where the center of the imaging element coincides with the imaging optical axis, and a flexible heat dissipation member that is connected to an end of the movable section in the movement direction of the movable section by a first connection section and is connected to an end of the fixed section in the movement direction by a second connection section, wherein at least a part of a deforming section of the heat dissipation member that is a section from the first connection section to the second connection section is located between the movable section and the fixed section in the imaging optical axis direction, and the deforming section is an arc section having a radius r and starting from the first connection section. a first curved portion including a first connecting portion and a second curved portion including an arc portion of radius r, the second curved portion having a first connecting portion as a starting point and the second connecting portion as a second connecting portion; and an annular portion having a first connecting portion and a second connecting portion as a second connecting portion as a second connecting portion. The first curved portion and the second curved portion have a first connecting portion and a second connecting portion as a second connecting portion. The first curved portion and the second curved portion have a first connecting portion and a second connecting portion as a second connecting portion. The first curved portion and the second curved portion have a first connecting portion and a second connecting portion as second connecting portions. [Effects of the Invention]

[0012] According to the present invention, it is possible to ensure smooth movement of the movable part and good cooling of the imaging element while suppressing the enlargement of the device. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a block diagram of an imaging device system. [Figure 2] FIG. [Figure 3] 2A and 2B are exploded front and rear perspective views of the imaging unit. [Figure 4]FIG. 2 is a schematic diagram of a heat dissipation member and its surrounding area as viewed from the +X side. [Figure 5] 10A and 10B are schematic diagrams showing deformation of the heat dissipation member when the movable part moves in the +Y direction. [Figure 6] FIG. 10 is a conceptual diagram for considering the necessary range of the load reducing unit. [Figure 7] FIG. 10 is a schematic diagram of a heat dissipation member and its surrounding area according to a second embodiment, viewed from the +X side. [Figure 8] 10A and 10B are schematic diagrams showing deformation of the heat dissipation member when the movable part moves in the +Y direction in the modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] (First embodiment) 1 is a block diagram of an imaging device system including an imaging device according to a first embodiment of the present invention. In this embodiment, a digital camera 100 (hereinafter simply referred to as camera 100) is exemplified as the imaging device. The imaging device system is composed of the camera 100 and a photographing lens 10. The photographing lens 10 is detachable (replaceable) from the camera 100. The optical axis C1 of the photographing lens 10 is the imaging optical axis.

[0016] The shutter 200 is a light blocking member, and opening and closing the shutter 200 controls the amount of exposure to the image sensor 311. A light beam incident on the photographic lens 10 is guided via the shutter 200 and forms an optical image on the imaging surface of the image sensor 311.

[0017] The imaging unit 300 includes an imaging element unit 310 and an image stabilization mechanism 320. The imaging element 311 included in the imaging unit 300 converts an optical image into an electrical signal. The image stabilization mechanism 320 performs so-called image element shift type image stabilization, which corrects image shake by driving the imaging element 311 in a plane perpendicular to the optical axis C1 according to the amount of shake detected by the gyroscope 20.

[0018] The system control unit 30 controls the entire camera 100. The system control unit 30 makes decisions and performs control in various operations of the camera 100. For example, the system control unit 30 controls the shutter 200, lens 11, etc. to perform AF processing and AE processing based on the results of calculations performed on image data by the image processing unit 32. The shutter control unit 210 controls the shutter 200 based on instructions from the system control unit 30. The lens control unit 12 controls the lens 11 based on instructions from the system control unit 30. The memory 31 is a device that stores constants, variables, programs, etc. for the operation of the system control unit 30. The memory 31 also stores the holding state of the image sensor unit 310 by the image stabilization mechanism 320.

[0019] The display unit 40 includes a rear display unit 175 and an EVF display unit 176 (FIG. 2), and displays information related to shooting. A thermometer 50 measures the temperature of the image sensor 311 and other heat-generating components. The operation members 60 are made up of various buttons and switches, and are used to select and set various functions when performing shooting, playback, communication, etc., as well as to give instructions related to shooting and playback.

[0020] Gyroscope 20 detects the amount of image blur of camera 100. Power switch (SW) 61 is used to turn the power on and off for camera 100. Power supply control unit 33 is composed of a battery detection circuit, a DC / DC converter, a switch circuit that switches between blocks to which electricity is applied, and the like. Power supply control unit 33 detects the type and remaining charge of battery 80 that serves as the power source for camera 100, and supplies the required voltage to each unit, including recording medium 90, for the required period based on the detection result and instructions from system control unit 30.

[0021] Figure 2 is an exploded perspective view of camera 100. Hereinafter, the directions of each part will be referred to based on the X, Y, and Z coordinate axes shown in Figure 2 and elsewhere. For convenience, the subject side will be referred to as the front in the direction parallel to optical axis C1 (Figure 1). The Z direction is parallel to the optical axis direction. The +Y direction is upward, and the +Z direction is forward. The +X direction is left when viewed from the subject side.

[0022] The camera 100 has a front base 102, a rear cover 104, a top cover 106, a bottom cover 108, and side covers 110 as exterior members.

[0023] The front base 102 is molded from magnesium die-cast or resin. A mount 103 to which the photographic lens 10 is attached is fixed to the front base 102, and a grip portion is provided for the user to hold the camera 100.

[0024] A plurality of operation members 60 and an openable and closable rear display unit 175 are attached to the rear cover 104. Also attached to the rear cover 104 are an EVF display unit 176 and a finder unit 112 through which the user looks into the subject.

[0025] A plurality of operating members 60 are attached to the top cover 106. The bottom cover 108 has a battery chamber that houses a battery 80 (FIG. 1), and is also attached with a tripod mount for fixing the camera 100. The side cover 110 has a terminal cover 111 that protects the external communication terminals 121 of the printed circuit board 120.

[0026] Inside these exterior members, the imaging unit 300, printed circuit board 120, shutter 200, and chassis 118 are arranged. Various electronic components are mounted on the printed circuit board 120, such as electronic elements that mount the system control unit 30 and image processing unit 32 (FIG. 1), and a connector for attaching the recording medium 90 (FIG. 1). The printed circuit board 120 is fixed to the front base 102 and the metal chassis 118 with screws. In addition, an external communication terminal 121 is mounted on the printed circuit board 120.

[0027] The flexible substrate 380 connects the image sensor unit 310 (FIG. 1) and the printed circuit board 120, and an image signal from the image sensor 311 is transmitted to the printed circuit board 120 via the flexible substrate 380.

[0028] The image sensor 311 consumes particularly large amounts of power compared to other components of the camera 100, and is therefore prone to temperature increases. However, if the temperature of the image sensor 311 rises above a certain level, it will affect the captured image, so it is necessary to keep the temperature of the image sensor 311 below a certain level. The imaging unit 300 including the image sensor 311 is fixed to the front base 102 with screws, and heat from the imaging unit 300 is transferred to the front base 102.

[0029] 3(a) and 3(b) are respectively an exploded front perspective view and an exploded rear perspective view of the imaging unit 300. The image stabilization mechanism 320 in the imaging unit 300 will be mainly described.

[0030] The imaging unit 300 has a movable part 330 and a fixed part 340. The fixed part 340 includes a front plate 341 and a rear plate 342. The front plate 341 and the rear plate 342 are both metal plates. The rear plate 342 is fixed to the front base 102 (FIG. 2) with screws, thereby fixing the imaging unit 300 to the camera 100.

[0031] The movable part 330 includes an imaging element unit 310 including an imaging element 311, and an imaging element holder 331 that holds the imaging element unit 310. The movable part 330 is disposed between a front plate 341 and a rear plate 342 of the fixed part 340 in the optical axis direction (optical axis C1 direction).

[0032] The imaging element holder 331 has ball holding portions 331a provided at three locations around the imaging element 311. Balls 335 are arranged between the ball holding portions 331a and a rear plate 342 of the fixed portion 340. As the balls 335 roll freely, the movable portion 330 is held between the front plate 341 and rear plate 342 of the fixed portion 340 so as to be movable in directions (X and Y directions) perpendicular to the optical axis C1.

[0033] A plurality of magnets 343 are arranged on the rear plate 342. The magnets 343 are sandwiched between the rear plate 342 and a plurality of fixing plates 344, and are thereby stably held within the fixing portion 340.

[0034] In the movable part 330, a plurality of coils 332 are held by an imaging element holder 331 so as to face a magnet 343. Power is supplied to the coils 332 by a flexible substrate 333 provided in the movable part 330. The driving control of the movable part 330 is performed by utilizing the magnetic field generated in the coils 332 to which power is supplied and the repulsive and attractive forces between the coils 332 and the magnet 343.

[0035] During normal times when there is no image shake, image stabilization mechanism 320 is controlled so that the center (center of gravity) of movable part 330 is maintained at a position that coincides with optical axis C1. During shooting, image stabilization mechanism 320 controls so that movable part 330 moves in a direction that cancels out image shake of camera 100 caused by the photographer.

[0036] In the movable part 330, a plurality of metal plates 334 are arranged so as to face the coil 332 from the +Z side. The metal plates 334 and the magnet 343 are attracted to each other by magnetic force, so that the image sensor holder 331 and the back plate 342 come into contact with each other with the ball 335 sandwiched therebetween. As a result, the movable part 330 including the image sensor 311 is positioned at a specified flange back position within the camera 100.

[0037] Heat dissipation member 400 is a flexible, sheet-like, low-friction member, and is made of, for example, a graphite sheet laminated with a PET sheet. Heat dissipation member 400 is arranged to connect imaging element holder 331 and rear plate 342. Heat generated by imaging element 311 is transferred to rear plate 342 via imaging element holder 331, which holds imaging element 311, and heat dissipation member 400. The heat is further transferred from rear plate 342 to front base 102, whereby the heat generated by imaging element 311 is dissipated. Slits 400a are formed in heat dissipation member 400, which are parallel to the extension direction (FIG. 2).

[0038] FIG. 4 is a schematic diagram of the heat dissipation member 400 and its surrounding area as viewed from the +X side.

[0039] Since heat dissipation member 400 is disposed on the +Y side, the movement direction of movable part 330 will be described with a focus on the Y direction. Note that one or more members having the same configuration as heat dissipation member 400 may also be provided on the +X side or the -X side. For heat dissipation members provided on the +X side or the -X side, the movement direction of movable part 330 of interest can be understood by replacing the Y direction with the X direction.

[0040] The system control unit 30, which serves as a control means, controls the movement of the movable unit 330 in the Y direction within a range of +W to -W relative to the neutral position. The unit of the distance W is not important, but is "mm" as an example. Here, the "neutral position" is the position where the center of the image sensor 311 (or the center of gravity of the movable unit 330) coincides with the center of the movable range (optical axis C1). Figure 4 shows the movable unit 330 in the neutral position.

[0041] Heat dissipation member 400 is disposed so as to connect movable portion 330 and fixed portion 340, and is fixed to movable portion 330 and fixed portion 340 by an adhesive member (not shown). The end portion on the +Y side of movable portion 330 in the Y direction and the end portion on the +Y side of fixed portion 340 are defined as ends 401c and 401d, respectively.

[0042] The heat dissipation member 400 is fixed to an attachment surface 401a of the movable part 330 and an attachment surface 401b of the fixed part 340 by an adhesive member (not shown). The attachment surface 401a is a surface on the +Z side near the end 401c in the direction of the optical axis C1, and the attachment surface 401b is a surface on the -Z side near the end 401d in the direction of the optical axis C1. The heat dissipation member 400 is further fixed to the +Y side surface of the end 401c of the movable part 330 and the +Y side surface of the end 401d of the fixed part 340. Therefore, in this embodiment, the heat dissipation member 400 is essentially connected to the end 401c at the first connection part N1 and to the end 401d at the second connection part N2.

[0043] The first connection portion N1 is an end position of the end portion 401c on the side (-Z side) closer to the fixed portion 340 in the direction of the optical axis C1. The second connection portion N2 is an end position of the end portion 401d on the side (+Z side) closer to the movable portion 330 in the direction of the optical axis C1.

[0044] The portion of the heat dissipation member 400 from the first connection portion N1 to the second connection portion N2 is the deforming portion 410. The deforming portion 410 is a portion where no adhesive member is attached, and is a portion that deforms in response to the movement of the movable portion 330.

[0045] The deforming section 410 includes a first curved section 406-1, a second curved section 406-2, and an annular section 403. At least a portion of the deforming section 410 (particularly at least a portion of the annular section 403) is located between the movable section 330 and the fixed section 340 in the direction of the optical axis C1. By arranging in this manner, an increase in the size of the camera 100 in the movement direction of the movable section 330 is suppressed.

[0046] The first curved portion 406-1 is formed starting from the first connecting portion N1 and includes an arc portion of radius r centered at center S1. The second curved portion 406-2 is formed starting from the second connecting portion N2 and includes an arc portion of radius r centered at center S2. The first curved portion 406-1 and the second curved portion 406-2 contact each other at a contact point 405. The annular portion 403 is formed starting from the contact point 405 and includes an arc portion of radius R centered at center P.

[0047] When movable part 330 is in the neutral position, ends 401c and 401d have the same end position, which is defined as end position A. In the Y direction, the distance from end position A to center P when movable part 330 is in the neutral position is defined as L. Furthermore, the tip position on the +Z side of annular shaped part 403 is apex 404-1, and the tip position on the -Z side of annular shaped part 403 is apex 404-2. When movable part 330 is in the neutral position, apexes 404-1, 404-2 and center P are aligned in the Z direction, and are all located a distance L from end position A in the Y direction.

[0048] The deforming portion 410 of the heat dissipation member 400 deforms as the movable portion 330 moves. If the length of the deforming portion 410 is insufficient, the deforming portion 410 may become stiff as the movable portion 330 moves, which may impede the driving of the movable portion 330. Therefore, the deforming portion 410 is required to have a sufficient length. On the other hand, if the apexes 404-1 and 404-2 of the annular portion 403 come into contact with the movable portion 330 or the fixed portion 340, friction may cause the movable portion 330 to move improperly unless some ingenuity is taken. Therefore, in this embodiment, sliding members 336 and 345 made of a sliding material or the like are provided on the opposing sides of the movable portion 330 and the fixed portion 340 as "load reducing portions." That is, the sliding member 336 is disposed on the -Z side surface of the movable portion 330, and the sliding member 345 is disposed on the +Z side surface of the fixed portion 340. The sliding members 336 and 345 are low-friction members for reducing the sliding load with the heat dissipation member 400 .

[0049] In addition, the centers S1 and S2 are respectively located at the same position in the Z direction as the inner surface of the movable part 330 (the -Z side surface including the sliding member 336) and the inner surface of the fixed part 340 (the +Z side surface including the sliding member 345).

[0050] The load reducers need to be positioned so as to encompass the range in which apexes 404-1 and 404-2 can come into contact. For convenience, in order to determine the required range of the load reducers, it is assumed that the arc portions of curved portions 406-1 and 406-2 and annular portion 403 are ideal arc shapes. However, if there is some leeway in the range in which the load reducers are positioned, there is little need to strictly determine the required range of the load reducers, and therefore the arc portions do not need to be perfect arc shapes. This is also true in the second embodiment.

[0051] Because the annular portion 403 is substantially in contact with the movable portion 330 and the fixed portion 340, the center P of the annular portion 403 is located at a midpoint in the Z direction between the movable portion 330 and the fixed portion 340. Therefore, the contact point 405 of the curved portions 406-1 and 406-2 is also located at a midpoint in the Z direction between the movable portion 330 and the fixed portion 340. An imaginary line L1 connecting the center P and the contact point 405 is parallel to the Y direction.

[0052] Fig. 5 is a schematic diagram showing deformation of heat dissipation member 400 when movable part 330 moves from the neutral position in the +Y direction by a distance W, which is within the controlled movable range. The upper diagram in Fig. 5 shows a state in which movable part 330 is in the neutral position, as in Fig. 4, and the lower diagram shows a state in which movable part 330 has moved by the distance W to the +Y side.

[0053] First, consider contact between the movable part 330 and the top part 404-1. When the movable part 330 is in the neutral position, the movable part 330 (including the sliding member 336 when considering the contact position; the same applies below) is in contact with the top part 404-1 at a position that is a distance L from the end position A. When the movable part 330 is driven a distance W in the +Y direction from the neutral position for image blur correction, the top part 404-1 moves W / 2, which is half the distance W, in the +Y direction. As a result, the movable part 330 comes into contact with the top part 404-1 at a position that is a distance L+W / 2 from the end position A of the movable part 330 (end position A' of the movable part 330 after movement). Therefore, focusing on the movable part 330, the movement of the movable part 330 in the +Y direction by the distance W causes the contact position with the top part 404-1 to shift by W / 2 in the -Y direction (the opposite direction to the movement direction).

[0054] Next, let us consider contact between the fixed portion 340 and the top portion 404-2. When the movable portion 330 is in the neutral position, the fixed portion 340 (including the sliding member 345 when considering the contact position; the same applies below) is in contact with the top portion 404-2 at a position that is a distance L from the end position A. When the movable portion 330 is driven a distance W in the +Y direction from the neutral position for image blur correction, the top portion 404-2 moves W / 2, which is half the distance W, in the +Y direction. As a result, the fixed portion 340 comes into contact with the top portion 404-2 at a position that is a distance LW / 2 from the end position A. Therefore, focusing on the fixed portion 340, the movement of the movable portion 330 in the +Y direction by the distance W results in a shift in the contact position between the fixed portion 340 and the top portion 404-2 by W / 2 in the +Y direction (the same direction as the movement direction).

[0055] Although not shown, when movable portion 330 is driven by distance W in the -Y direction from the neutral position, the movement direction of top portions 404-1 and 404-2 is opposite to that shown in the lower part of Fig. 5. Therefore, the direction of change in the contact position between movable portion 330 and top portion 404-1 and the direction of change in the contact position between fixed portion 340 and top portion 404-2 are opposite to those described in Fig. 5.

[0056] FIG. 6 is a conceptual diagram for considering the necessary range of the load reducing section. This embodiment corresponds to "fixed at N1, N2." Note that "fixed at D1, D2" will be described later as a second embodiment. Position POS5 corresponds to the contact position with tops 404-1, 404-2 when movable section 330 is in the neutral position.

[0057] When the movable part 330 moves a distance W in the +Y direction from the neutral position, the movable part 330 comes into contact with the top part 404-1 at a position POS6. When the movable part 330 moves a distance W in the -Y direction from the neutral position, the movable part 330 comes into contact with the top part 404-1 at a position POS4. Therefore, it is sufficient to arrange a load reduction part on the movable part 330 so that it encompasses the range from position POS6 to position POS4, and this range 1 is the required range of the load reduction part.

[0058] On the other hand, when the movable part 330 moves a distance W in the +Y direction from the neutral position, the fixed part 340 comes into contact with the top part 404-2 at a position POS4. When the movable part 330 moves a distance W in the -Y direction from the neutral position, the fixed part 340 comes into contact with the top part 404-2 at a position POS6. Therefore, it is sufficient to arrange a load reducer in the fixed part 340 so that it encompasses the range from position POS6 to position POS4, and this range 1 is the required range of the load reducer (the same range as the movable part 330).

[0059] Next, a method for calculating the positions POS4 to POS6 will be described. Note that in these calculations, the thickness of the heat dissipation member 400 is ignored.

[0060] First, the distance from the end position A to the position POS5 is distance L. Using the Pythagorean theorem and the like with radii r and R, distance L is calculated by Equation 1. L=r+[(r+R)^2-r^2]^0.5···(1)

[0061] As described above, since the centers S1 and S2 are at the same position in the Z direction as the inner surfaces of the movable part 330 and the fixed part 340, the radius r and the radius R are the same (r = R). Therefore, Equation 1 can also be expressed as Equation 2 or Equation 3. L=R+[2R^2-R^2]^0.5 (2) L = R + √3 × R (3)

[0062] Further, the distance PL6 from the end position A to the position POS6 is calculated by the following equation (4). PL6=r+[(r+R)^2-r^2]^0.5+W / 2···(4) If r=R, Equation 4 can also be expressed as Equation 5. PL6=R+3^0.5×R+W / 2 (5) Further, the distance PL4 from the end position A to the position POS4 is calculated by the following equation (6). PL4=r+[(r+R)^2-r^2]^0.5-W / 2···(6)

[0063] Therefore, in the movable part 330 and the fixed part 340, the load reducing part is arranged so as to encompass a range 1 from position POS4 (first position) to position POS6 (second position) with end position A as the reference.

[0064] By arranging sliding members 336 and 345 in range 1, it is possible to achieve a heat dissipation configuration that does not impede drive control. Range 1 is a range that assumes that movable part 330 moves within the controlled movable range. Note that, taking into consideration the case where movable part 330 moves beyond the controlled movable range, a range beyond range 1 may be set as the range for arranging the load reducing part. In this way, even when camera 100 is powered off, it is possible to suppress surface wear and damage to heat dissipation member 400 due to contact between heat dissipation member 400 and movable part 330 and fixed part 340.

[0065] According to this embodiment, at least a portion of the deforming portion 410 of the heat dissipation member 400 is located between the movable portion 330 and the fixed portion 340 in the direction of the optical axis C1, thereby suppressing the enlargement of the device. Furthermore, the fixed portion 340 and the movable portion 330 are thermally connected by the heat dissipation member 400, thereby ensuring heat dissipation from the imaging element 311. Furthermore, the heat dissipation member 400 is flexible, and the load reducing portions (sliding members 336, 345) encompass a range 1 from position POS4 (first position) to position POS6 (second position) relative to the end position A, thereby ensuring smooth movement of the movable portion 330. Therefore, smooth movement of the movable portion 330 and good cooling of the imaging element 311 can be ensured while suppressing the enlargement of the device.

[0066] (Second embodiment) 7 is a schematic diagram of a heat dissipation member 400 and its surrounding area according to a second embodiment of the present invention, viewed from the +X side. This embodiment differs from the first embodiment in the fixed position of the heat dissipation member 400 relative to the fixed part 340 and the movable part 330. The same reference numerals are used for parts common to the first embodiment.

[0067] Heat dissipation member 400 is fixed to attachment surface 401a of movable portion 330 and attachment surface 401b of fixed portion 340 by an adhesive member (not shown). On the other hand, heat dissipation member 400 is not fixed to the +Y side surface of end 401c of movable portion 330 or the +Y side surface of end 401d of fixed portion 340. Therefore, heat dissipation member 400 is essentially connected to end 401c at first connection portion D1 and to end 401d at second connection portion D2.

[0068] The first connection portion D1 is an end position of the end portion 401c on the side (+Z side) farther from the fixed portion 340 in the direction of the optical axis C1. The second connection portion D2 is an end position of the end portion 401d on the side (-Z side) farther from the movable portion 330 in the direction of the optical axis C1.

[0069] The portion of the heat dissipation member 400 from the first connection portion D1 to the second connection portion D2 is the deforming portion 410. The deforming portion 410 is a portion where no adhesive member is attached, and is a portion that deforms in response to the movement of the movable portion 330.

[0070] The deforming section 410 includes a first curved section 402-1, a second curved section 402-2, and an annular section 403. At least a portion of the deforming section 410 (particularly at least a portion of the annular section 403) is located between the movable section 330 and the fixed section 340 in the direction of the optical axis C1. By arranging in this manner, an increase in the size of the camera 100 in the movement direction of the movable section 330 is suppressed.

[0071] The first curved portion 402-1 is formed starting from the first connecting portion D1 and includes an arc portion of radius r centered at center Q1. The second curved portion 402-2 is formed starting from the second connecting portion D2 and includes an arc portion of radius r centered at center Q2. The first curved portion 402-1 and the second curved portion 402-2 contact each other at a contact point 405. The annular portion 403 is formed starting from the contact point 405 and includes an arc portion of radius R centered at center P. Note that the values ​​of radius r, R, and distance L do not have to be the same as those shown in the first embodiment.

[0072] As shown in FIG. 7, when the movable portion 330 is in the neutral position, the centers Q1 and Q2 are at the same position as the end position A in the Y direction.

[0073] The transition of contact between the movable portion 330 and the top portion 404-1 and the fixed portion 340 and the top portion 404-2 in response to the movement of the movable portion 330 in the Y direction is the same as in the first embodiment.

[0074] In FIG. 6, position POS2 corresponds to the contact position with the tops 404-1 and 404-2 when the movable portion 330 is in the neutral position.

[0075] 6, when the movable part 330 moves a distance W in the +Y direction from the neutral position, the movable part 330 comes into contact with the top part 404-1 at a position POS3. When the movable part 330 moves a distance W in the -Y direction from the neutral position, the movable part 330 comes into contact with the top part 404-1 at a position POS1. Therefore, it is sufficient to arrange a load reduction part on the movable part 330 so that it encompasses the range from position POS3 to position POS1, and this range 2 is the required range of the load reduction part.

[0076] On the other hand, when the movable part 330 moves a distance W in the +Y direction from the neutral position, the fixed part 340 comes into contact with the top part 404-2 at position POS1. When the movable part 330 moves a distance W in the -Y direction from the neutral position, the fixed part 340 comes into contact with the top part 404-2 at position POS3. Therefore, it is sufficient to arrange a load reducer in the fixed part 340 so that it encompasses the range from position POS3 to position POS1, and this range 2 is the required range of the load reducer (the same range as the movable part 330).

[0077] Next, a method for calculating the positions POS1 to POS3 will be described. Note that in these calculations, the thickness of the heat dissipation member 400 is ignored.

[0078] First, the distance from the end position A to the position POS2 is distance L. Using the Pythagorean theorem and the radius r and R, distance L is calculated by Equation 7. L = [(r + R)^2 - r^2]^0.5 (7) Further, the distance PL1 from the end position A to the position POS1 is calculated by the formula (8). PL1=[(r+R)^2-r^2]^0.5-W / 2···(8) Further, the distance PL3 from the end position A to the position POS3 is calculated by Equation 9. PL3=[(r+R)^2-r^2]^0.5+W / 2···(9)

[0079] Therefore, in the movable part 330 and the fixed part 340, the load reducing part is arranged so as to encompass a range 2 from position POS1 (first position) to position POS3 (second position) with end position A as the reference.

[0080] By arranging the sliding members 336 and 345 in this range 2, it is possible to achieve a heat dissipation configuration that does not impede drive control. Note that, in consideration of the case where the movable part 330 moves beyond the controlled movable range, a range beyond range 2 may be set as the arrangement range of the load reducing part.

[0081] According to this embodiment, the load reducing parts (sliding members 336, 345) encompass a range 2 from position POS1 (first position) to position POS3 (second position) with end position A as the reference, thereby ensuring smooth movement of the movable part 330. Therefore, it is possible to achieve the same effects as in the first embodiment in terms of ensuring smooth movement of the movable part 330 and good cooling of the image sensor 311 while suppressing the enlargement of the device.

[0082] It is also possible that the first and second connection parts connected to the respective ends of the movable part 330 and the fixed part 340 are not clearly at the N1, N2 positions (first embodiment) or the D1, D2 positions (second embodiment). Even if the first connection part is within the range from the N1 position to the D1 position and the second connection part is within the range from the N2 position to the D2 position, the required ranges may be set as follows to ensure that the tops 404-1 and 404-2 come into contact with the load reducing parts.

[0083] That is, in the movable part 330 and the fixed part 340, the load reducing part may be arranged so as to encompass a range 3 from position POS1 (first position) to position POS6 (second position) based on the end position A shown in Figure 6.

[0084] 6, position POS4 is farther from end position A than position POS3, but the positional relationship between positions POS3 and POS4 may be reversed. That is, range 1 and range 2 may have an overlapping area.

[0085] (Variation) 8 is a schematic diagram showing deformation of the heat dissipation member 400 when the movable part 330 moves in the +Y direction in the modified example. In the first and second embodiments, the load reducing part is configured by a member that reduces the sliding load with the heat dissipation member 400. In contrast, the modified example employs relief parts 330b, 340b to avoid contact with the heat dissipation member 400.

[0086] The upper diagram in FIG. 8 shows a state in which the movable part 330 is in a neutral position, and the lower diagram shows a state in which the movable part 330 has moved by a distance W to the +Y side.

[0087] Relief portions 330b, 340b are formed, for example, by cutting out a portion or by forming a through hole in movable portion 330 and fixed portion 340. The formation range of relief portions 330b, 340b is a range that includes range 1, as in the first embodiment. Providing relief portions 330b, 340b makes it possible to avoid contact between movable portion 330, fixed portion 340 and deformation portion 410, thereby realizing a heat dissipation configuration that does not impede drive control.

[0088] 8 shows a representative example in which the recesses are applied to a configuration including the heat dissipation member 400 of the first embodiment. However, the recesses 330b and 340b may also be applied to a configuration including the heat dissipation member 400 of the second embodiment.

[0089] In this modified example, when the movable section 330 moves for image blur correction, the annular section 403 of the deformation section 410 moves in a direction rotating in the YZ plane, starting from the connection sections N1 and N2, in accordance with the movement of the movable section 330. At that time, when the movable section 330 moves in the Y direction, the annular section 403 moves toward the +Y side. Furthermore, the greater the amount of movement of the annular section 403 toward the +Y side, the greater the amount of movement in the Z direction.

[0090] Therefore, the recesses 330b, 340b are formed deeper in the Z direction as they approach the end position A. This makes it possible to efficiently avoid contact between the movable part 330, the fixed part 340 and the deformation part 410 without making the recesses 330b, 340b excessively deep.

[0091] The camera 100 may be an integrated lens type. The imaging device to which the present invention is applied may be a video camera or the like.

[0092] The disclosure of this embodiment includes the following configuration. (Configuration 1) a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range from +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deformation portion includes a first curved portion having an origin at the first connection portion and including an arc portion of radius r, a second curved portion having an origin at the second connection portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction; the first position is [(r+R)^2-r^2]^0.5-W / 2, An imaging device, wherein the second position is r+[(r+R)^2-r^2]^0.5+W / 2. (Configuration 2) a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range from +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deformation portion includes a first curved portion having an origin at the first connection portion and including an arc portion of radius r, a second curved portion having an origin at the second connection portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction; the first connection portion is an end position of the end portion of the movable portion that is closer to the fixed portion in the imaging optical axis direction, the second connection portion is an end position of the end portion of the fixed portion that is closer to the movable portion in the imaging optical axis direction, the first position is r+[(r+R)^2-r^2]^0.5-W / 2; An imaging device, wherein the second position is R+3^0.5×R+W / 2. (Configuration 3) a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range from +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deformation portion includes a first curved portion having an origin at the first connection portion and including an arc portion of radius r, a second curved portion having an origin at the second connection portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction; the first connection portion is an end position of the end portion of the movable portion that is farther from the fixed portion in the imaging optical axis direction, the second connection portion is an end position of the end portion of the fixed portion that is farther from the movable portion in the imaging optical axis direction, the first position is [(r+R)^2-r^2]^0.5-W / 2, An imaging device, wherein the second position is [(r+R)^2-r^2]^0.5+W / 2. (Configuration 4) 4. The imaging device according to any one of configurations 1 to 3, wherein at least a portion of the annular portion is located between the movable portion and the fixed portion in the imaging optical axis direction. (Configuration 5) 5. The imaging device according to any one of configurations 1 to 4, wherein the load reducing portion is a low-friction member provided on each of the movable portion and the fixed portion. (Configuration 6) 4. The imaging device according to any one of configurations 1 to 3, wherein the load reducing portion is a relief portion formed in each of the movable portion and the fixed portion. (Configuration 7) The imaging device described in configuration 6, wherein the recess of the movable part is formed deeper as it approaches the end of the movable part, and the recess of the fixed part is formed deeper as it approaches the end of the fixed part. (Configuration 8) 8. The imaging device according to any one of configurations 1 to 7, wherein at least a portion of the deformation portion has a slit that is parallel to the extension direction from the first connection portion to the second connection portion. [Explanation of symbols]

[0093] 330 Moving parts 340 Fixed part 336, 345 Sliding members 400 Heat dissipation material 403 Annular shaped part 410 Deformed part 406-1, 401-2 First curved portion 406-2, 402-2 second curved portion N1, D1 First connection N2, D2 Second connection

Claims

1. a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range of +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deforming portion includes a first curved portion having an origin at the first connecting portion and including an arc portion of radius r, a second curved portion having an origin at the second connecting portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction, the first position is [(r+R)^2-r^2]^0.5-W / 2; The imaging device, wherein the second position is r+[(r+R)^2-r^2]^0.5+W / 2.

2. a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range of +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deforming portion includes a first curved portion having an origin at the first connecting portion and including an arc portion of radius r, a second curved portion having an origin at the second connecting portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction, the first connection portion is an end position of the end portion of the movable portion that is closer to the fixed portion in the imaging optical axis direction, the second connection portion is an end position of the end portion of the fixed portion that is closer to the movable portion in the imaging optical axis direction, the first position is r + [(r + R)^2 - r^2]^0.5 - W / 2; The imaging device, wherein the second position is R+3^0.5×R+W / 2.

3. a movable part that holds an imaging element; a fixed portion that holds the movable portion so that the movable portion is movable in a direction perpendicular to the imaging optical axis; a control means for controlling the movement of the movable part within a range of +W to −W with respect to a neutral position where the center of the image sensor coincides with the image pickup optical axis; a flexible heat dissipation member connected to an end of the movable part in a movement direction of the movable part by a first connection part and connected to an end of the fixed part in the movement direction by a second connection part, at least a part of a deformation portion of the heat dissipation member that is a portion from the first connection portion to the second connection portion is located between the movable portion and the fixed portion in the imaging optical axis direction, the deforming portion includes a first curved portion having an origin at the first connecting portion and including an arc portion of radius r, a second curved portion having an origin at the second connecting portion and including an arc portion of radius r, and an annular portion having an origin at a contact point between the first curved portion and the second curved portion and including an arc portion of radius R, a load reducing portion is provided on each of the opposing sides of the movable portion and the fixed portion to reduce a sliding load with the heat dissipation member or to avoid contact with the heat dissipation member; the load reducing portion encompasses a range from a first position to a second position based on end positions of the ends of the movable portion and the fixed portion in the movement direction, the first connection portion is an end position of the end portion of the movable portion that is farther from the fixed portion in the imaging optical axis direction, the second connection portion is an end position of the end portion of the fixed portion that is farther from the movable portion in the imaging optical axis direction, the first position is [(r+R)^2-r^2]^0.5-W / 2; The imaging device, wherein the second position is [(r+R)^2-r^2]^0.5+W / 2.

4. 4. The imaging device according to claim 1, wherein at least a part of the annular portion is located between the movable portion and the fixed portion in the imaging optical axis direction.

5. 4. The imaging device according to claim 1, wherein the load reducing portion is a low-friction member provided on each of the movable portion and the fixed portion.

6. 4. The imaging device according to claim 1, wherein the load reducing portion is a relief portion formed in each of the movable portion and the fixed portion.

7. 7. The imaging device according to claim 6, wherein the recess of the movable part is formed deeper as it approaches the end of the movable part, and the recess of the fixed part is formed deeper as it approaches the end of the fixed part.

8. 4. The imaging device according to claim 1, wherein at least a part of the deformation portion is provided with a slit that is parallel to the extension direction from the first connection portion to the second connection portion.

Images