Imaging apparatus

Abstract

To obtain sufficient performance to cool an image pick-up device without increasing the drive load on image shake correction.SOLUTION: An imaging apparatus 100 has a stationary part 113, a movable part 114, driving means driving the movable part 114 relative to the stationary part 113, and a heat dissipation member 200 connecting the movable part 114 and the stationary part 113 to each other. The movable part 114 holds an image pick-up device 115, and is movably supported by the stationary part 113 in a plane parallel to an imaging surface of the image pick-up device 115, with a constant gap from the stationary part 113 in an imaging optical axis direction. The heat dissipation member 200 is not in contact with the movable part 114 and the stationary part 113 regardless of the position of the movable part 114 within a drive control range.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an imaging device having an image blur correction mechanism that displaces an imaging element. [Background technology]

[0002] Imaging devices such as digital still cameras and video cameras are commonly equipped with image stabilization mechanisms that correct image shake by displacing (oscillating) an image sensor in a plane perpendicular to the imaging optical axis to improve image quality. Image sensors, such as CMOS sensors, generate heat during operation. Therefore, a cooling mechanism is required to prevent the image sensor from exceeding its guaranteed operating temperature. A cooling mechanism that efficiently cools the image sensor without increasing the drive load during image stabilization drive is needed. In response to this demand, Patent Document 1 discloses a technology that reduces the drive load during image stabilization drive, which displaces a movable part having an image sensor, by orthogonally ... [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 202811 Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned Patent Document 1 does not disclose the relationship between the width and length of the heat transfer member and surrounding components. Therefore, for example, if the shape and placement of the heat transfer member are designed with emphasis on cooling performance, there is a risk that the drive load during image stabilization drive, which displaces the movable part having the image sensor, will become large.

[0005] The present invention has been made in view of the above circumstances, and has as its object to provide an imaging device that can obtain sufficient cooling performance for the imaging element without increasing the driving load of image stabilization. [Means for solving the problem]

[0006] The imaging device of the present invention comprises a fixed part, a movable part that holds an imaging element and is supported on the fixed part so as to be movable within a plane parallel to the imaging surface of the imaging element with a certain gap between it and the fixed part in the imaging optical axis direction, a driving means that drives the movable part relative to the fixed part, and a heat dissipation member that connects the movable part and the fixed part, and is characterized in that the heat dissipation member does not come into contact with the movable part and the fixed part regardless of the position of the movable part within the drive control range of the movable part. [Effects of the Invention]

[0007] According to the present invention, sufficient cooling performance for the image sensor can be obtained without increasing the driving load of image stabilization. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram showing a schematic configuration of an imaging system according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the imaging system. [Figure 3] FIG. [Figure 4] 10 is a cross-sectional view showing a state of the heat dissipation member when the movable part is displaced in the x direction. FIG. [Figure 5] 10 is a cross-sectional view showing the state of the heat dissipation member when the movable part is displaced in the y direction. FIG. [Figure 6] 10A and 10B are cross-sectional views showing modified examples of the arrangement of the heat dissipation member. [Figure 7] FIG. 10 is a perspective view showing a first modified example of the heat dissipation member. [Figure 8] FIG. 10 is a cross-sectional view showing a second modified example of the heat dissipation member. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a block diagram showing a schematic configuration of an imaging system 10 according to an embodiment. The imaging system 10 is generally composed of an imaging device 100 and a lens device 500 that is detachable from the imaging device 100. Specifically, the imaging system 10 is a digital camera that can capture still images and videos. The lens device 500 is a so-called interchangeable lens.

[0010] The imaging device 100 includes a shutter 108, an imaging element 115, a system control unit 150, an A / D converter 151, an image processing unit 152, a memory 153, a memory control unit 154, a nonvolatile memory 155, a system memory 156, and a system timer 157. The imaging device 100 also includes a power supply unit 160, a power supply control unit 161, a camera communication terminal 170, a shake detection unit 172, a storage medium I / F 171, a rear display unit 175, an EVF display unit 176, and an operation unit 180. A storage medium 600 is detachably attached to the imaging device 100. The lens device 500 includes a lens 501, a lens driving unit 502, an aperture 503, an aperture driving unit 504, a lens control unit 505, and a lens communication terminal 506.

[0011] In the imaging device 100, the shutter 108 is a focal plane shutter that controls the exposure time of the image sensor 115, and the operation of the shutter 108 is controlled by the system control unit 150. The image sensor 115 is a CMOS sensor or the like, and photoelectrically converts an object image (optical image) formed by light passing through the lens device 500 to generate an analog image signal and outputs it to the A / D converter 151. The A / D converter 151 converts the analog image signal transmitted from the image sensor 115 into a digital image signal. The digital image signal is transmitted to the image processing unit 152 and written to the memory 153 via the memory control unit 154. The image processing unit 152 performs image processing such as pixel interpolation, resizing, and color conversion on the digital image signal transmitted from the A / D converter 151 or the memory control unit 154 to generate image data. The image processing unit 152 also performs AWB processing and the like based on the results of calculations using the image data.

[0012] The system control unit 150 is a computer (MPU) that includes a processor such as a CPU and circuits, and performs overall control of the imaging system 10 by executing programs stored in a nonvolatile memory 155. The system control unit 150 controls the operations of the image sensor 115 and the shutter 108 in response to imaging instructions from the user, for example, and also performs AF control and AE control based on image data generated by the image processing unit 152.

[0013] The memory 153 temporarily records the digital imaging signal output from the A / D converter 151 and the image data generated by the image processing unit 152. The memory 153 also serves as an image display memory (video memory). The memory control unit 154 controls the exchange of data between the A / D converter 151, the image processing unit 152, and the memory 153. The non-volatile memory 155 is a storage medium such as an EEPROM that can be electrically erased and stored, and stores constants and programs for operating the system control unit 150. The system memory 156 is a storage medium that can be read and written, and stores programs read from the non-volatile memory 155 and constants and variables for operating the system control unit 150.

[0014] The system timer 157 measures the time of no operation until the automatic power-off state, which puts the imaging system 10 into a power-saving state to prevent battery consumption when the imaging system 10 is not operated by the user, and the exposure time of the imaging element 115 by the shutter 108. The power supply unit 160 is configured with a primary battery, a secondary battery, or an AC adapter. The power supply control unit 161 determines whether a battery is installed in the power supply unit 160, determines the type of installed battery, and detects the remaining battery power, and supplies the required voltage to various components at the required timing.

[0015] The camera communication terminal 170 is electrically connected to a lens communication terminal 506 of the lens device 500, thereby enabling two-way communication between the system control unit 150 and a lens control unit 505 of the lens device 500. The storage medium I / F 171 is an interface that enables communication between the system control unit 150 and a storage medium 600 attached to the imaging device 100. The storage medium 600 is a memory card, flash memory, hard disk, etc. that is attachable to and detachable from the imaging device 100, and stores (preserves) image data of still images and videos generated by the image processing unit 152. The shake detection unit 172 is configured with a gyro sensor or the like, and outputs a signal corresponding to shake (shake, vibration) occurring in the imaging system 10 due to camera shake or the like.

[0016] The rear display unit 175 provided on the rear of the imaging device 100 and the EVF display unit 176 located in the viewfinder each have an LCD panel, an organic EL panel, or the like, and display live view images, images for confirming imaging, menu screens for making various settings for the imaging system 10, and the like.

[0017] The operation unit 180 accepts user operations and outputs a signal corresponding to the accepted operation to the system control unit 150. The operation unit 180 includes, for example, a mode selector switch 181, a first shutter switch 183 and a second shutter switch 184 linked to a release button 182, a touch panel 185, and a power switch 186. The mode selector switch 181 is an operation member for switching between still image capture and video capture. The release button 182 is an operation member with which the user issues a shooting preparation instruction and a shooting instruction. The first shutter switch 183 is turned on when the release button 182 is half-pressed, and outputs an SW1 signal to the system control unit 150. The second shutter switch 184 is turned on when the release button 182 is fully pressed, and outputs an SW2 signal to the system control unit 150. When the system control unit 150 receives the SW1 signal, it executes shooting preparation operations (AF processing, AE processing, AWB processing, etc.), and when it receives the SW2 signal, it executes shooting of an image for recording. The touch panel 185 is provided on the rear display unit 175, and outputs a signal to the system control unit 150 for executing an operation in response to a touch operation on an icon or the like displayed on the rear display unit 175. The power switch 186 is an operating member for switching the power of the imaging system 10 on / off.

[0018] In the lens device 500, only one lens 501 is shown in FIG. 1 for simplicity, but in reality, the lens device 500 is made up of multiple lenses such as a focus lens, a zoom lens, and an image stabilization lens. A lens driver 502 drives the lens 501 in response to a command from a lens controller 505. An aperture 503 adjusts the amount of light incident on the imaging device 100. An aperture driver 504 drives the aperture 502 in response to a command from the lens controller 505. A lens communication terminal 506 is electrically connected to the camera communication terminal 170, thereby enabling two-way communication between the system controller 150 and the lens controller 505. The lens controller 505 controls the driving of the lens driver 502 and the aperture driver 504 based on a control signal transmitted from the system controller 150.

[0019] 2 is an exploded perspective view of the imaging device 100. The imaging device 100 has, as exterior members, a front base 102, a rear cover 101, a top cover 103, a bottom cover 104, and a side cover 105. Inside the imaging device 100, which is made up of these exterior members, there are arranged an imaging unit 106 having an image sensor 115 (see FIG. 3) and an image stabilization mechanism, a main board 107, a shutter 108, and a chassis 110.

[0020] The front base 102 is formed of magnesium die-cast or resin and includes a mount 102a to which the lens device 500 is attached. The front base 102 also includes a grip portion through which a user grips the imaging device 100. The rear cover 101 is attached with a vari-angle rear monitor 190 having a rear display unit 175 and multiple operating members operable by the user. The rear cover 101 is also attached with a viewfinder unit 109. The user can check the display content of the EVF display unit 176 by bringing their eye 700 (see FIG. 1 ) close to the viewfinder unit 109. The top cover 103 is provided with multiple operating members operable by the user (such as a mode selector switch 181, a release button 182, and a power switch 186). The bottom cover 104 includes a battery cover that covers the opening of a battery chamber that constitutes the power supply unit 160, and also includes an opening for exposing a tripod mount provided on the bottom surface of the front base 102. The side cover 105 is provided with a terminal cover 105 a for protecting an external communication terminal 107 c mounted on the main board 107 .

[0021] The main board 107 is configured by mounting multiple circuit elements (electronic and electrical components) on both sides of a multilayer board. The circuit elements mounted on the main board 107 include an A / D converter 151, an image processing unit 152, a system control unit 150 (MPU 107a), a memory 153, a memory control unit 154, a nonvolatile memory 155, and a system memory 156. The main board 107 also mounts a system timer 157, a power control unit 161, a storage medium I / F 171, and a vibration detection unit 172. The main board 107 also mounts a storage medium connector 107b connected to the storage medium 600 and an external communication terminal 107c for connecting a cable used to connect to an external device. The main board 107 is fixed to the front base 102 and a metal chassis 110 with screws.

[0022] An imaging signal FPC 111 and an imaging power supply FPC 112 are connected to the main board 107. The imaging signal FPC 111 connects the main board 107 and the imaging unit 106, and transmits imaging signals output from the imaging element 115 and control signals required to drive the imaging element 115 between the system control unit 150 and the imaging element 115. The imaging power supply FPC 112 supplies power for driving the imaging element 115 from a power supply control unit 161 on the main board 107 to the imaging element 115.

[0023] FIG. 3 is an exploded perspective view of the imaging unit 106, and the viewing direction of the imaging unit 106 is reversed in FIG. 3(a) and FIG. 3(b). The imaging unit 106 is roughly composed of a movable part 114 and a fixed part 113. As shown in FIGS. 3(a) and 3(b), mutually orthogonal x, y, and z axes are defined. The z axis is parallel to the imaging optical axis direction, and when the z axis and x axis are parallel to the horizontal direction, the y axis is parallel to the vertical direction. In other words, the z direction is the front-to-rear direction of the imaging device 100, the x direction is the width direction of the imaging device 100, and the y direction is the height direction of the imaging device 100.

[0024] The movable section 114 is made up of an imaging element 115 and a sensor holder 117 that holds the imaging element 115. The imaging element 115 is made up of a sensor chip having a plurality of pixels adhesively fixed to an imaging substrate 115a, and electrodes of the sensor chip are electrically connected to a circuit provided on the imaging substrate 115a by wire bonding. Circuit components 115b, such as capacitors, resistors, and regulators, that make up the circuit of the imaging substrate 115a are mounted on the surface of the imaging substrate 115a opposite to the surface to which the sensor chip is attached.

[0025] The movable section 114 is supported with a certain gap relative to the fixed section 113 so as to be displaceable (movable) within a plane perpendicular to the imaging optical axis (the optical axis of the lens device 500). The fixed section 113 is a support member that supports the movable section 114 so as to be displaceable, and is fixed to the front base 102 of the imaging device 100.

[0026] The positioning of movable part 114 relative to fixed part 113 in the optical axis direction is achieved by the following configuration. That is, three coils 116 are fixed to sensor holder 117, and three magnets 118 are fixed to fixed part 113 at positions facing the three coils 116 in the imaging optical axis direction. Furthermore, ball holding parts 117a are provided in three places on the surface of sensor holder 117 facing fixed part 113, and rolling balls (not shown) are disposed in each of the three ball holding parts 117a. Movable part 114 is attracted and held toward fixed part 113 by the magnetic force of magnets 118, and is thereby positioned relative to fixed part 113 in the imaging optical axis direction.

[0027] The imaging unit 106 controls the energization of the three coils 116 to control the Lorentz force generated between the three coils 116 and the three magnets 118. This allows the movable unit 114 to oscillate (displace) via the rolling balls in a plane perpendicular to the imaging optical axis, in other words, in a plane parallel to the imaging surface of the imaging element 115. The system control unit 150 performs image shake correction drive, which controls the energization of the coils 116 so that the movable unit 114 displaces in a direction that reduces image shake caused by camera shake, depending on the direction and magnitude of camera shake or the like detected by the shake detection unit 172.

[0028] Next, a heat dissipation configuration from the image sensor 115 to the outside will be described. The image sensor 115 consumes particularly large amounts of power among the components of the imaging device 100, and therefore generates a large amount of heat, making it prone to temperature rise. The imaging time available for the imaging system 10 is limited by the guaranteed operating temperature of the image sensor 115 when there is sufficient battery power remaining. Therefore, in order to maximize the imaging time available, it is necessary to cool the image sensor 115 so that the temperature of the image sensor 115 does not exceed the guaranteed operating temperature.

[0029] In the imaging device 100, three heat dissipation members 200 are arranged between the movable part 114 and the fixed part 113 so as to connect them. The heat dissipation members 200 are sheet-shaped and made of a graphite sheet or the like laminated with a PET sheet or the like. Heat generated by the imaging element 115 is transferred to the fixed part 113 via the imaging board 115a and sensor holder 117 that hold the imaging element 115, and the heat dissipation members 200, and then from the fixed part 113 to the front base 102 that is fixed with screws or the like, and is finally dissipated into the outside air. In this way, by dissipating the heat generated by the imaging element 115 into the outside air, it is possible to suppress a rise in temperature of the imaging element 115.

[0030] A heat dissipation structure using the heat dissipation member 200 is required to have the function of suppressing a temperature rise in the image sensor 115, as well as the characteristic of not increasing the load of the image stabilization drive or keeping the increase in load to a minimum. While a configuration in which three heat dissipation members 200 are arranged is shown in FIG. 3, each of the heat dissipation members 200 is required to have equivalent characteristics. Therefore, next, we will focus on one of the two heat dissipation members 200 arranged at the ends of the image sensor 106 in the x direction, and explain its relationship with the image stabilization drive.

[0031] FIG. 4 is a cross-sectional view showing an example of the heat dissipation member 200 relative to the movable portion 114 and the fixed portion 113. As shown in FIG.

[0032] FIG. 4(a) shows a state in which the movable part 114 is in a reference position (a position where the center of the image sensor 115 and the imaging optical axis coincide). FIG. 4(b) shows a state in which the movable part 114 has been displaced to the -x-direction end of its horizontal control range. FIG. 4(c) adds a definition of the distance between predetermined positions to FIG. 4(b). Note that although the movable part 114, fixed part 113, and heat dissipation member 200 are all shown in cross section in FIGS. 4(a) to 4(c), the hatching indicating that they are cross sections has been omitted.

[0033] Heat dissipation member 200 straddles movable portion 114 and fixed portion 113 in the z direction and is fixed to movable portion 114 and fixed portion 113 with an adhesive. Except for the adhesive portions (fixed regions) for movable portion 114 and fixed portion 113, heat dissipation member 200 forms deforming portion 201 that deforms according to the position of movable portion 114. Note that the adhesive portions in heat dissipation member 200 are portions that contact movable portion 114 and fixed portion 113 in a plane perpendicular to the z direction. In addition, in heat dissipation member 200, the width of the adhesive portions and the width of deforming portion 201 are the same.

[0034] 4(a), the thickness direction of the heat dissipation member 200 in the fixed regions fixed to the movable portion 114 and the fixed portion 113 is parallel to the imaging optical axis of the imaging element 115, i.e., perpendicular to the imaging surface. The deforming portion 201 is defined as having a movable-side end point 201a, a first movable-side bending end 201b, a second movable-side bending end 201d, a movable-side bending vertex 201c, a central movable-side bending end 201e, a central fixed-side bending end 201g, and a central bending vertex 201f. The deforming portion 201 is also defined as having a fixed-side end point 201k, a first fixed-side bending end 201j, a fixed-side bending vertex 201i, and a second fixed-side bending end 201h.

[0035] The deforming portion 201 has three curved portions: near the side surface of the movable portion 114 (around the movable-side bending vertex 201c), near the side surface of the fixed portion 113 (around the fixed-side bending vertex 201i), and at the center of the deforming portion 201 (around the central bending vertex 201f). These curved portions are formed by causing plastic deformation in the heat dissipation member 200 when the heat dissipation member 200 is manufactured or assembled, and the curved shape can be maintained even when the heat dissipation member 200 is in a free state where no external force is applied.

[0036] Of the three curved portions, the curved portion near the movable portion 114 is provided on the outer side of the side surface (-X side) of the movable portion 114. Similarly, the curved portion near the fixed portion 113 is provided on the outer side of the side surface (-X side) of the fixed portion 113. On the other hand, of the three curved portions, the central curved portion is disposed at an approximately central position in the z direction (optical axis direction) of the space sandwiched between the movable portion 114 and the fixed portion 113 in the reference state of FIG. 4(a) in which the imaging unit 106 is held at the center of the optical axis. With this configuration, it is possible to incorporate the heat dissipation member 200 without increasing the size of the imaging device 100 as much as possible.

[0037] The deforming portion 201 deforms in accordance with the movement of the movable portion 114. As an example, when the movable portion 114 is displaced from the reference position to the end in the −x direction, the deforming portion 201 deforms from the shape shown in FIG. 4( a) to the shape shown in FIG. 4( b). At this time, in order to minimize the increase in the driving load of the image stabilization caused by the heat dissipation member 200, it is necessary that the deforming portion 201 does not come into contact with the movable-part facing surface 114a, which is the surface of the movable portion 114 that faces the fixed portion 113. In other words, by configuring the deforming portion 201 so that it does not come into contact with the movable portion 114 even when the deforming portion 201 deforms in accordance with the displacement of the movable portion 114, an increase in the driving load of the image stabilization caused by contact or friction with the heat dissipation member 200 can be prevented, and a deterioration in image stabilization performance can be prevented.

[0038] Whether or not contact occurs between the movable-part facing surface 114a and the deforming part 201 due to displacement of the movable part 114 is synonymous with whether or not the central movable-side bent end 201e of the deforming part 201 contacts the movable-part facing surface 114a. Whether or not the central movable-side bent end 201e contacts the movable-part facing surface 114a depends on the distance Z in the z direction between the movable part 114 and the fixed part 113, the displacement distance X of the movable part 114, and the length of the deforming part 201.

[0039] Because the positions of the central movable-side bending end 201e and the central fixed-side bending end 201g change depending on the position of the movable section 114, a virtual point 201m at the central bending tip is defined. The virtual point 201m is the intersection of a line connecting the second movable-side bending end 201d and the central movable-side bending end 201e and a line connecting the second fixed-side bending end 201h and the central fixed-side bending end 201g. The triangle formed by the second movable-side bending end 201d, the second fixed-side bending end 201h, and the virtual point 201m is an isosceles triangle because the total length of the heat dissipation member 200 is always constant and the heat dissipation member 200 has three curved portions due to plastic deformation. In other words, the length from the second movable-side bending end 201d to the virtual point 201m and the length from the second fixed-side bending end 201h to the virtual point 201m are always equal, and these lengths are defined as the length L of the virtual straight line portion.

[0040] 4(c) shows a state in which the imaginary point 201m is in contact with the movable-part opposing surface 114a. The amount of displacement X of the movable part 114 relative to the fixed part 113 and the distance Z in the z direction between the movable part 114 and the fixed part 113 are defined. The distance r1 in the z direction between the movable-part opposing surface 114a and the movable-side second bent end 201d and the distance r2 in the z direction between the fixed-part opposing surface 113a (the surface of the fixed part 113 that faces the movable part 114) and the fixed-side second bent end 201h are also defined. Here, one of the three bending parts is provided approximately in the center of the deformation part 201 from the viewpoint of drive load controllability, and therefore the distances r1 and r2 have approximately the same value r (r1 = r2 = r).

[0041] Using these values, the x-direction distance L1 from the movable-side second bending end 201d to the imaginary point 201m is expressed by the following formula 1, and the x-direction distance L2 from the fixed-side second bending end 201h to the imaginary point 201m is expressed by the following formula 2. Furthermore, when the imaginary point 201m is in contact with the movable-part facing surface 114a, the z-direction distance from the fixed-side second bending end 201h to the imaginary point 201m is 'Z-r', and therefore the x-direction distance L3 from the fixed-side second bending end 201h to the imaginary point 201m is expressed by the following formula 3. The following formula 5 can be derived from the following formula 4, which shows that the distances L2 and L3 are equal. In order to avoid an increase in the drive load of image stabilization (to prevent the imaginary point 201m from coming into contact with the movable-part facing surface 114a), the heat dissipation member 200 should be designed so that the relationship in the following formula 6 is satisfied. Furthermore, regarding the minimum length L0 of the length L, since the deforming portion 201 needs to deform while having an excess length, it can be designed so that the following relational expression 7 is satisfied based on FIG. 4(c) and Pythagoras' theorem.

[0042]

number

[0043] In this embodiment, the thickness (length in the z direction) of the movable part 114 is smaller than the length in the z direction only of the curved part having the movable-side bending apex 201c. In contrast, if the thickness of the movable part 114 is larger, the heat dissipation member 200 will come into contact with the movable-part opposing surface end 114b (see FIG. 4(a)) in the range from the movable-side second bending end 201d to the central movable-side bending end 201e. This problem can be solved by making the thickness of the movable part 114 locally thinner only in the vicinity of the heat dissipation member 200 than the length in the z direction only of the bending part at the movable-side bending apex 201c.

[0044] When the movable part 114 is displaced to the +x-direction end, the deforming part 201 is deformed so that the curved part having the central bending vertex 201f is displaced toward the fixed part facing surface 113a. At this time, the condition for preventing the imaginary point 201m from contacting the fixed part facing surface 113a can be considered to be the same as when the movable part 114 is displaced to the -x-direction end described above, and therefore a description thereof will be omitted.

[0045] Next, we will explain the movement of the deformation portion 201 in the heat dissipation member 200 when the movable portion 114 is displaced in the y direction, which is the height direction of the imaging device 100, due to image shake correction driving. Here, we will also focus on the heat dissipation member 200 shown in Figure 4, that is, one of the two heat dissipation members 200 arranged at the ends of the imaging unit 106 in the x direction.

[0046] 5(a) is a cross-sectional view of the heat dissipation member 200 and its vicinity when the movable part 114 is displaced to the +y-direction end (the far side of the paper in FIG. 5(a)) of its height-direction control range, as viewed from the -y direction. FIG. 5(b) is a view of the fixed part 113, movable part 114, and heat dissipation member 200 in the state of FIG. 5(a), as viewed from the x direction. Note that in FIG. 5(a), the movable part 114, fixed part 113, and heat dissipation member 200 are all shown in cross section, but the hatching indicating that they are cross sections has been omitted.

[0047] When the movable part 114 is displaced in the y direction, a situation will be considered in which the deformation part 201 comes into contact with the movable part facing surface 114a, similar to the case in which the movable part 114 is displaced in the x direction described above. The state of the deformation part 201 in the reference state in which image stabilization driving is not performed is as shown in Figure 4(a) above.

[0048] 5(b), the width W (width in the y direction) of the heat dissipation member 200, the distance D between the attachment surfaces of the heat dissipation member 200 at the fixed part 113 and the movable part 114, and the distance R in the z direction between the central movable-side bending end 201e and the imaginary point 201m are defined. In addition, the y-direction end of the movable-side first bending end 201b is defined as the movable-side first bending upper end 201by, the y-direction end of the central movable-side bending end 201e is defined as the central movable-side bending upper end 201ey, and the y-direction end of the fixed-side first bending end 201j is defined as the fixed-side first bending upper end 201jy.

[0049] As the movable portion 114 is displaced in the y direction, the movable-side first bent upper end 201b also displaces in the y direction in the same manner as the movable portion 114. Therefore, the deformation portion 201 is generally -1 At this time, the distance between the central movable side bending end 201e and the central movable side bending upper end 201ey is '(W / 2)×sin{tan { -1 (Y / D)} occurs. Assuming that the central movable side bent upper end 201ey comes into contact with the movable part facing surface 114a, the difference in the z direction between the central movable side bent end 201e and the central movable side bent upper end 201ey is equal to '(Z / 2)-R', and therefore the following formula 8 is derived. In order to prevent an increase in the drive load for image blur correction (so that the central movable side bent upper end 201ey does not come into contact with the movable part facing surface 114a), the heat dissipation member 200 should be designed so that the relationship in the following formula 9 is satisfied.

[0050] Note that the case where movable part 114 is displaced in the -y direction is the same as the case where movable part 114 is displaced in the +y direction, and therefore a description thereof will be omitted. Also, because heat dissipation member 200 has a band shape with a uniform width W, width W of heat dissipation member 200 becomes the width of deforming part 201, but it is also possible to use a heat dissipation member in which the width of the adhesive part and the width of the deforming part differ, in which case width W is used as the width of the deforming part.

[0051]

number

[0052] In this way, by using the parameters (Z, D), (X, Y), and (r, R) that respectively indicate the arrangement of the movable part 114 and the fixed part 113, the drive amount of the movable part 114, and the rigidity of the heat dissipation member 200, it is possible to design the configuration (L, W) of the deformation part 201 that does not hinder the image stabilization drive.

[0053] So far, we have described the case where the movable part 114 is displaced to the extreme end of the drive control range for image stabilization. However, the movable range of the movable part 114 is usually wider than the drive control range. Therefore, the action of an external force, such as an impact on the imaging device 100, can cause the movable part 114 to move within the image stabilization range but outside the drive control range. Therefore, it is desirable that the above expressions 6, 7, and 9 be satisfied even when the movable part 114 is displaced within the image stabilization range but outside the drive control range. This prevents the heat dissipation member 200 from coming into contact with the movable part 114 and the fixed part 113 even when the imaging system 10 is powered off, thereby preventing damage to the heat dissipation member 200.

[0054] So far, we have described a configuration in which the fixing positions of heat dissipation member 200 with respect to fixed portion 113 and movable portion 114 are the surfaces opposite fixed portion opposing surface 113a and the surfaces opposite movable portion opposing surface 114a. Next, we will describe a configuration in which the fixing positions of heat dissipation member 200 with respect to fixed portion 113 and movable portion 114 are changed to fixed portion opposing surface 113a and movable portion opposing surface 114a.

[0055] FIG. 6 is a cross-sectional view showing a modified arrangement of the heat dissipation member 200. FIG. 6(a) shows a state in which the movable part 114 is in a reference position, as in FIG. 4(a), and FIG. 6(b) shows a state in which the movable part 114 has been displaced in the x-direction within the horizontal control range. FIG. 6(c) adds a definition of the distance between predetermined positions to FIG. 6(b). Note that although the movable part 114, fixed part 113, and heat dissipation member 200 are all shown in cross section in FIGS. 6(a) to 6(c), the hatching indicating that they are cross sections has been omitted.

[0056] The heat dissipation member 200 is fixed to the movable portion facing surface 114a and the fixed portion facing surface 113a. In this case, as shown in Fig. 6(a), the movable-side end point 201a and the movable-side first bent end 201b are the same point, and the fixed-side end point 201k and the fixed-side first bent end 201j are the same point, and the other points of the deformation portion 201 can be defined in the same way as in Fig. 4(a).

[0057] The deformation portion 201 deforms as shown in FIG. 6(b) in accordance with the displacement of the movable portion 114, and the distance relationship between each point of the deformation portion 201 at this time is as shown in FIG. 6(c).

[0058] The condition for preventing the imaginary point 201m from contacting the movable-part facing surface 114a, which is a condition for suppressing an increase in the drive load during image blur correction, is the same as the above-mentioned formula 6 explained with reference to Fig. 4(c). Note that Figs. 6(b) and 6(c) show a state in which the imaginary point 201m is not in contact with the movable-part facing surface 114a, but in a state in which the imaginary point 201m is in contact with the movable-part facing surface 114a, the distances r1 and r2 shown in Fig. 6(c) have approximately the same value r.

[0059] 5(c) above, the width W of the heat dissipation member 200 is the same as when 'D=Z' is set. Therefore, by setting 'D=Z' in the above relational expression 9, the condition of the following relational expression 10 is satisfied, and it is possible to prevent the central movable-side bent upper end 201ey from contacting the movable-part opposing surface 114a.

[0060]

number

[0061] Next, heat dissipation member 200A as a first modified example of heat dissipation member 200 will be described. FIG. 7 is a perspective view showing a state in which heat dissipation member 200A is attached to fixed portion 113 and movable portion 114. Heat dissipation member 200A has a laminated structure made of multiple resin sheets (e.g., PET sheets) and graphite sheets, and does not have a signal line. Deformation portion 201A of heat dissipation member 200A corresponding to deformation portion 201 of heat dissipation member 200 has multiple slits 202 formed in the longitudinal direction of heat dissipation member 200A to reduce the load on heat dissipation member 200A due to the displacement (swing) of movable portion 114. The portion of deformation portion 201A other than multiple slits 202 is a strip-shaped portion 203 including graphite sheets, and the graphite sheets stacked in strip-shaped portion 203 can each be deformed independently.

[0062] The width of the slit 202 is set to a value that prevents adjacent strip portions 203 from contacting each other even when the movable portion 114 is displaced to the extreme end of its drive control range, so that the drive load during image stabilization does not increase due to contact between the strip portions 203. Note that the multiple strip portions 203 do not all need to have the same length and width, but from the perspective of controllability during image stabilization, it is desirable that none of the multiple strip portions 203 contact the movable portion facing surface 114a and the fixed portion facing surface 113a. In other words, the length and width of each of the multiple strip portions 203 must satisfy the above formula 6 and formula 9 (or formula 10).

[0063] Next, a heat dissipation member 200B as a second modified example of the heat dissipation member 200 will be described. FIG. 8 is a cross-sectional view, similar to FIG. 4(a), showing the arrangement of the heat dissipation member 200B relative to the movable portion 114 and the fixed portion 113 with the movable portion 114 in a state where the movable portion 114 is in a reference position. The heat dissipation member 200B has five curved portions that are plastically deformed. Specifically, in addition to the three curved portions of the heat dissipation member 200 that are plastically deformed, the heat dissipation member 200B has a fourth curved portion 201p that bends from the end of the movable portion 114 to follow the side surface thereof, and a fifth curved portion 201q that bends from the end of the fixed portion 113 to follow the side surface thereof. The fourth curved portion 201p and the fifth curved portion 201q enable the x-direction dimension of the deformed portion 201B of the heat dissipation member 200B to be reduced, thereby enabling the imaging device 100 to be miniaturized.

[0064] 8, when the deformation end, bending start end, bending most convex part, bending end end, and imaginary point are defined for the deformation portion 201B in the same way as for the deformation portion 201 of the heat dissipation member 200, the relationships among these are the same as for the deformation portion 201. Therefore, also for the heat dissipation member 200B, the condition for the imaginary point 201m not to come into contact with the movable-part facing surface 114a in order to prevent an increase in the drive load during image blur correction is expressed by the above formula 6. Similarly, for the width of the heat dissipation member 200B, the condition for the central movable-side bending upper end 201ey (not shown in FIG. 8, see FIG. 5(b)) not to come into contact with the movable-part facing surface 114a is expressed by the above formula 9.

[0065] While the present invention has been described in detail above based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the gist of the present invention are also included in the present invention. Furthermore, each of the above-described embodiments merely represents one embodiment of the present invention, and each embodiment can be combined as appropriate.

[0066] The disclosure of this embodiment includes the following configuration. (Configuration 1) An imaging device comprising: a fixed portion; a movable portion that holds an imaging element and is supported on the fixed portion so as to be movable within a plane parallel to the imaging surface of the imaging element with a certain gap between it and the fixed portion in the imaging optical axis direction; a driving means that drives the movable portion relative to the fixed portion; and a sheet-like heat dissipation member that connects the movable portion and the fixed portion, wherein the thickness direction of the heat dissipation member in fixed areas that are fixed to the movable portion and the fixed portion respectively is parallel to the imaging optical axis, and the deformable portion of the heat dissipation member excluding the fixed area does not come into contact with the movable portion and the fixed portion regardless of the position of the movable portion within the drive control range of the movable portion. (Configuration 2) The imaging device described in Configuration 1, characterized in that the movable part is movable within a movable range wider than the drive control range, and the deformation part does not come into contact with the movable part and the fixed part regardless of the position of the movable part within the movable range. (Configuration 3) An imaging device according to configuration 1 or 2, characterized in that the deformation portion is provided with at least one slit extending in the longitudinal direction of the heat dissipation member, and the band-shaped portions facing each other across the slit in the deformation portion do not come into contact with each other regardless of the position of the movable portion within the drive control range. (Configuration 4) An imaging device described in any one of configurations 1 to 3, characterized in that the heat dissipation member has at least three curved portions that maintain a curved shape in a free state, and one of the three curved portions is positioned at approximately the middle position in the imaging optical axis direction in the gap when the imaging element is held at the center of the optical axis. (Configuration 5) An imaging device described in any one of configurations 1 to 4, characterized in that the heat dissipation member is fixed to a surface of the movable part opposite to a surface facing the fixed part, and a surface of the fixed part opposite to a surface facing the movable part. (Configuration 6) An imaging device described in any one of configurations 1 to 4, characterized in that the heat dissipation member is fixed to a surface of the movable part facing the fixed part and a surface of the fixed part facing the movable part. (Configuration 7) Two other curved portions of the three curved portions are arranged near the side surfaces of the movable portion and the fixed portion, and a driving amount of the movable portion in a first direction on the plane is represented by X, a driving amount of the movable portion in a second direction on the plane perpendicular to the first direction is represented by Y, a distance in the imaging optical axis direction between a surface to which the heat dissipation member is fixed on the movable portion and a surface to which the heat dissipation member is fixed on the fixed portion is represented by Z, a distance between an end point on the movable portion side of the curved portion provided near the side surface of the fixed portion and a surface of the fixed portion facing the movable portion is represented by r, and a distance between a fixing region of the heat dissipation member relative to the movable portion and a fixing region of the fixed portion is represented by A first relational expression is given by: D is the distance in the imaging optical axis direction of the fixed region of the heat dissipation member relative to the movable portion; an imaginary point is the intersection of a line connecting an end point of the curved portion arranged in the gap on the movable portion side and an end point of the curved portion arranged near the side surface of the movable portion on the fixed portion side with a line connecting an end point of the curved portion arranged in the gap on the fixed portion side and an end point of the curved portion arranged near the side surface of the fixed portion on the movable portion side; L is the length from the end point of the curved portion arranged near the side surface of the fixed portion on the movable portion side to the imaginary point; and W is the width of the portion of the heat dissipation member connecting the other two curved portions. 2 / 2X)-(Zr / X)} 2 +r 2 ] 0.5 , and the second relation: W<(Z-2R) / sin{(tan -1 (Y / D)} is satisfied. (Configuration 8) The minimum length from the end point of the curved portion disposed near the side surface of the fixed portion on the movable portion side to the virtual point is L0, and the third relational expression: L0>(Z 2 +X 2 ) 0.5 8. The imaging device according to claim 7, wherein the following condition is satisfied: (Configuration 9) An imaging device as described in Configuration 7 or 8, characterized in that the heat dissipation member has a plurality of slits extending in the longitudinal direction of the heat dissipation member, and adjacent strip-shaped portions between the plurality of slits in the heat dissipation member do not come into contact with each other regardless of the position of the movable part within the drive control range. (Configuration 10) The imaging device according to configuration 9, wherein the strip portion sandwiched between the slits satisfies the first relational expression and the second relational expression. (Configuration 11) The imaging device according to any one of configurations 1 to 10, wherein the heat dissipation member has a laminated structure made up of a plurality of resin sheets and graphite sheets, and does not have a signal line. (Configuration 12) An imaging device comprising: a fixed section; a movable section that holds an imaging element and is supported by the fixed section so as to be movable within a plane parallel to an imaging surface of the imaging element with a certain gap between it and the fixed section in the imaging optical axis direction; and a heat dissipation member that connects the movable section and the fixed section, wherein the heat dissipation member has a first curved section, a second curved section, and a third curved section that maintain a curved shape in a free state, the first curved section is disposed at an approximately middle position in the imaging optical axis direction in the gap when the imaging element is held at the center of the optical axis, the second curved section is disposed near a side surface of the movable section, and the third curved section is disposed near a side surface of the fixed section, and a driving amount of the movable section in a first direction in the plane is represented by X, a driving amount of the movable section in a second direction in the plane perpendicular to the first direction is represented by Y, and A first relational expression: L<[{(X / 2)+(Z 2 / 2X)-(Zr / X)} 2 +r 2 ] 0.5 , and the second relation: W<(Z-2R) / sin{(tan -1 (Y / D)} is satisfied. [Explanation of symbols]

[0067] 10. Imaging System 100 Imaging device 106 Imaging unit 113 Fixed part 113a Fixed part facing surface 114 Moving parts 114a Moving part facing surface 115 Image sensor 200, 200A, 200B heat dissipation material 201,201A Deformed part 202 Slit 203 Belt

Claims

1. A fixed portion; a movable section that holds an imaging element and is supported by the fixed section with a certain gap between it and the fixed section in the imaging optical axis direction so as to be movable within a plane parallel to an imaging surface of the imaging element; a driving means for driving the movable portion relative to the fixed portion; an imaging device including a sheet-like heat dissipation member connecting the movable portion and the fixed portion, a thickness direction of the heat dissipation member in a fixed region where the heat dissipation member is fixed to the movable portion and the fixed portion is parallel to the imaging optical axis; An imaging device characterized in that the deformable portion of the heat dissipation member excluding the fixed region does not come into contact with the movable portion and the fixed portion regardless of the position of the movable portion within the drive control range of the movable portion.

2. the movable part is movable within a movable range wider than the drive control range, 2. The imaging device according to claim 1, wherein the deformable portion does not come into contact with the movable portion and the fixed portion no matter where the movable portion is located within the movable range.

3. At least one slit extending in the longitudinal direction of the heat dissipation member is provided in the deformation portion, 3. The imaging device according to claim 1, wherein the band-shaped portions facing each other across the slit in the deformation portion do not come into contact with each other regardless of the position of the movable portion within the drive control range.

4. the heat dissipation member has at least three curved portions that maintain a curved shape in a free state; 2. The imaging device according to claim 1, wherein one of the three curved portions is positioned at approximately the middle position in the imaging optical axis direction in the gap when the imaging element is held at the center of the optical axis.

5. The imaging device according to claim 4, characterized in that the heat dissipation member is fixed to a surface of the movable portion opposite to a surface facing the fixed portion, and to a surface of the fixed portion opposite to a surface facing the movable portion.

6. 5. The imaging device according to claim 4, wherein the heat dissipation member is fixed to a surface of the movable portion facing the fixed portion and a surface of the fixed portion facing the movable portion.

7. two other curved portions of the three curved portions are disposed near the side surfaces of the movable portion and the fixed portion, respectively; the driving amount of the movable part in the first direction on the plane is X, a driving amount of the movable part in a second direction perpendicular to the first direction on the plane, Y; a distance in the imaging optical axis direction between a surface to which the heat dissipation member is fixed in the movable portion and a surface to which the heat dissipation member is fixed in the fixed portion; The distance between the end point of the curved portion provided near the side surface of the fixed portion on the movable portion side and the surface of the fixed portion facing the movable portion is r, A distance in the imaging optical axis direction between a fixing region of the heat dissipation member relative to the movable portion and a fixing region of the heat dissipation member relative to the fixed portion is D, The intersection of a line connecting the end point of the curved portion disposed in the gap on the movable unit side and the end point of the curved portion disposed near the side surface of the movable unit on the fixed unit side with a line connecting the end point of the curved portion disposed in the gap on the fixed unit side and the end point of the curved portion disposed near the side surface of the fixed unit on the movable unit side is defined as an imaginary point, and the length from the end point of the curved portion disposed near the side surface of the fixed unit on the movable unit side to the imaginary point is defined as L, The width of the portion of the heat dissipation member connecting the other two curved portions is defined as W, First relation: L<[{(X / 2)+(Z ２ / 2X)-(Zr / X)} ２ +r ２ ] ０．５ , and the second relation: W<(Z-2R) / sin{(tan －１ 7. The imaging device according to claim 5, wherein the following relation is satisfied: (Y / D)

8. The minimum length from the end point on the movable part side of the curved part arranged near the side surface of the fixed part to the virtual point is L ０ As, Third relation: L ０ >(Z ２ +X ２ ) ０．５ 8. The imaging device according to claim 7, wherein the following relation is satisfied:

9. the heat dissipation member has a plurality of slits extending in a longitudinal direction of the heat dissipation member, 9. The imaging device according to claim 8, wherein adjacent strip-shaped portions between the plurality of slits in the heat dissipation member do not come into contact with each other no matter where the movable portion is located within the drive control range.

10. The imaging device according to claim 9 , wherein the strip portion sandwiched between the slits satisfies the first relational expression and the second relational expression.

11. 3. The imaging device according to claim 1, wherein the heat dissipation member has a laminated structure made up of a plurality of resin sheets and graphite sheets, and does not have a signal line.

12. A fixed portion; a movable section that holds an imaging element and is supported by the fixed section with a certain gap between it and the fixed section in the imaging optical axis direction so as to be movable within a plane parallel to an imaging surface of the imaging element; a heat dissipation member connecting the movable portion and the fixed portion, the heat dissipation member has a first curved portion, a second curved portion, and a third curved portion that maintain a curved shape in a free state; the first curved portion is disposed at a substantially middle position in the gap in the direction of the imaging optical axis when the imaging element is held at the center of the optical axis, the second curved portion is disposed near a side surface of the movable portion, and the third curved portion is disposed near a side surface of the fixed portion; the driving amount of the movable part in the first direction on the plane is X, a driving amount of the movable part in a second direction perpendicular to the first direction on the plane, Y; The distance between the fixed position of the heat dissipation member in the movable portion and the fixed position of the fixed portion in the imaging optical axis direction is Z, a distance between an end point of the third curved portion on the movable portion side and a surface of the fixed portion facing the movable portion, r; The distance between the fixed position of the heat dissipation member at the movable portion and the fixed position of the heat dissipation member at the fixed portion in the imaging optical axis direction is D, an intersection of a straight line connecting an end point of the first bending portion on the movable unit side and an end point of the second bending portion on the fixed unit side with a straight line connecting an end point of the first bending portion on the fixed unit side and an end point of the third bending portion on the movable unit side as a virtual point, and a length from the end point of the second bending portion on the fixed unit side to the virtual point as L; The width of the portion of the heat dissipation member connecting the second curved portion and the third curved portion is defined as W, First relation: L<[{(X / 2)+(Z ２ / 2X)-(Zr / X)} ２ +r ２ ] ０．５ , and the second relation: W<(Z-2R) / sin{(tan －１ (Y / D)} is satisfied.

Images