Imaging apparatus

Abstract

To provide an imaging apparatus that does not inhibit drive controllability of a movable part while sufficiently cooling the heat from an image pick-up device.SOLUTION: An imaging apparatus has a movable part 114 for holding an image pick-up device, and a stationary part 113 for fixing the movable part 114 movably in a direction perpendicular to an optical axis direction. The imaging apparatus comprises a heat dissipation member 200 connecting the movable part 114 and the stationary part to each other, a first holding plate (301) held integrally with the heat dissipation member 200, and a second holding plate (311) held integrally with the heat dissipation member 200. The first holding plate is fixed to the movable part 114 and the second holding plate is fixed to the stationary part. The fixation of the first holding plate and the second holding plate is performed in the optical axis direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an imaging device that is equipped with an image stabilization mechanism and has a heat dissipation function. [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 difficult to capture good images. In addition, imaging devices that perform "image stabilization" by moving the imaging element in a direction perpendicular to the optical axis to improve image quality have become widespread in recent years.

[0003] Even in imaging devices that perform this type of image stabilization, sufficient heat dissipation must be ensured because heat generated in the image sensor when the image stabilization mechanism is operating, during continuous shooting, and during video shooting affects image quality. Patent Document 1 discloses a device that reduces the load on the image stabilization mechanism by orienting the thickness of a bendable heat dissipation member that connects the movable and fixed parts of the image stabilization mechanism in a direction perpendicular to the optical axis. Patent Document 2 also discloses an imaging device that dissipates heat by connecting a heat dissipation member to the metal plate on the bottom of the device. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2020 / 202811 publication [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-28940 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the conventional technology disclosed in Patent Document 1 mentioned above does not disclose the fixing position of the heat dissipation member, and if the repulsive force of the heat dissipation member differs from the fixing direction of the heat dissipation member, there is a problem that it is difficult to fix the heat dissipation member during device assembly. Also, in the conventional technology disclosed in Patent Document 2, the heat dissipation member is thermally connected to the back surface of the image sensor with a small bending radius, and there is a problem that when applied to an image stabilization mechanism, the control load increases.

[0006] The present invention has been made in view of the above-mentioned problems, and has as its object to provide an imaging device that is easy to assemble, does not impair the drive controllability of the movable part, and sufficiently cools the heat from the imaging element. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, one aspect of the present invention is an imaging device having a movable part that holds an imaging element and a fixed part that fixes the movable part so that it can move in a direction perpendicular to the optical axis direction, and is characterized in that it is equipped with a heat dissipation member that connects the movable part and the fixed part, a first holding plate that is held integrally with the heat dissipation member, and a second holding plate that is held integrally with the heat dissipation member and is different from the first holding plate, wherein the first holding plate is fixed to the movable part and the second holding plate is fixed to the fixed part, and the fixing of the first holding plate and the second holding plate is performed in the optical axis direction. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an imaging device that can be easily assembled, while sufficiently cooling the heat from the imaging element and without impairing the drive controllability of the movable part. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram of a digital camera. [Figure 2] FIG. 2 is an exploded perspective view of the digital camera. [Figure 3] FIG. [Figure 4]1A and 1B are perspective and cross-sectional views of a main part of a digital camera. [Figure 5] FIG. 2 is an exploded perspective view of the main part of the digital camera. [Figure 6] 1A and 1B are a perspective view and a cross-sectional view of Modification 1. [Figure 7] 10A and 10B are a perspective view, a cross-sectional perspective view, and a cross-sectional view of Modification 2. [Figure 8] FIG. 10 is a cross-sectional view of Modified Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the configurations described in the following embodiments are merely examples, and the scope of the present invention is not limited to the configurations described in the embodiments. Note that in the following embodiments, a digital camera 100 will be used as an example of an imaging device, but imaging devices are not limited to this.

[0011] (Figure 1: Block diagram of digital camera 100) (Lens unit 500: Lens 501) FIG. 1 shows the configuration of a digital camera (hereinafter also referred to as "camera") 100, which is one form of an imaging device according to a first embodiment of the present invention. A lens unit 500 having a lens 501 is attached to the camera 100 in a detachable (replaceable) manner. For simplicity's sake, FIG. 1 shows only one lens 501, but multiple lenses may be provided. The lens unit 500 has an aperture 503, an aperture drive circuit 504 that drives the aperture 503, a lens drive circuit 502 that drives the lens 501, a lens control unit 505, and a lens communication terminal 170.

[0012] (Aperture 503: aperture drive circuit 504: lens drive circuit 502: lens control unit 505; lens communication terminal 170) The lens communication terminal 506 is a communication terminal through which the lens unit 500 communicates with the digital camera 100. Upon receiving a control instruction from the camera system control unit 150 via communication, the lens control unit 505 controls the position (aperture value) of the aperture 503 and the focus of the lens 501 via the aperture drive circuit 504 and the lens drive circuit 502.

[0013] (shutter 108: imaging unit 106: imaging element 115: A / D converter 151) The shutter 108, the imaging unit 106, and the A / D converter 151 are arranged downstream of the lens unit 500. The shutter 108 is a focal plane shutter or the like that controls the exposure time of the imaging element 115, which will be described later, and its operation is controlled by the camera system control unit 150, which will be described later. The imaging element 115 is composed of a CCD sensor, a CMOS sensor, or the like, and performs photoelectric conversion (captures) of a subject image (optical image) formed by light that has passed through the lens 501, and outputs an imaging signal (analog signal). The imaging element 115, not shown in the example of FIG. 1, is built into the imaging unit 106. The A / D converter 151 performs analog-to-digital conversion of the analog imaging signal output from the imaging element 115 into a digital imaging signal.

[0014] (Image processing unit 152; memory 153; memory control unit 154) The digital imaging signal is stored in the memory 153 via the image processing unit 152 and memory control unit 154, or via the memory control unit 154. 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 memory 153 temporarily stores the digital imaging signal output from the A / D converter 151 and the image data generated by the image processing unit 152. The image processing unit 152 generates image data by performing image processing such as pixel interpolation, resizing, and color conversion on the digital imaging signal from the A / D converter 151 and the memory control unit 154. Furthermore, the image processing unit 152 also performs auto white balance processing and the like based on the results of calculations using the image data.

[0015] (Camera system control unit 150: Non-volatile memory 155) The camera system control unit 150 is configured by a computer including a processor such as a CPU and circuits, and controls the camera 100 and lens unit 500 by executing programs stored in nonvolatile memory 155. For example, the camera system control unit 150 controls the image sensor 115 and shutter 108 in response to an image capture instruction from a user, and also performs autofocus control and aperture control based on image data generated by the image processing unit 152. The nonvolatile memory 155 is an electrically erasable and storable read-only memory device, and stores constants, programs, etc. for the operation of the camera system control unit 150. The camera system control unit 150 executes the programs stored in the nonvolatile memory 155, thereby realizing various functions required for the operation of the camera 100.

[0016] (Shake detection unit 172: System timer 157: System memory 156) Multiple types of electronic devices are connected to the camera system control unit 150. For example, a shake detection unit 172, a system timer 157, and a system memory 156 are connected. The system memory 156 is a readable and writable memory device that stores constants, variables, programs read from the non-volatile memory 155, and other data for the operation of the camera system control unit 150. The system timer 157 measures the time of no operation until the camera 100 enters an auto power-off state, which places the camera 100 in a power-saving state to prevent battery consumption if the user is not operating the camera 100, and the exposure time of the image sensor 115 by the shutter 108. The shake detection unit 172 is implemented by a gyro sensor or the like, and outputs a signal corresponding to the shake of the camera 100 due to hand shake or the like (hereinafter also referred to as "camera shake").

[0017] (power supply unit 160: power supply control unit 161: lens communication terminal 170) The power supply unit 160 is composed of 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 battery installed, and detects the remaining battery power, and supplies the required voltage to the destination at the required timing. In addition, the lens communication terminal 170 is electrically connected to a lens communication terminal 506 provided in the lens unit 500, and communicates between the camera system control unit 150 and a lens control unit 505 in the lens unit 500.

[0018] (Recording medium I / F 171: Recording medium 600) The recording medium I / F 171 is an interface with a recording medium 600 that is detachably attached to the camera 100. The recording medium 600 is a memory card, a flash memory, a USB memory, a hard disk, etc., and records image data (still images, moving images) generated by the image processing unit 152.

[0019] (Mounting of electronic elements on main board 107) A plurality of electronic elements such as a CPU, ICs, memory chips, etc. that constitute the A / D converter 151, image processing unit 152, camera system control unit 150, memory 153, memory control unit 154, etc., described above, are mounted on a main board 107, which will be described later. Similarly, a plurality of electronic elements such as a CPU, ICs, memory chips, etc. that constitute the nonvolatile memory 155, system memory 156, system timer 157, power supply control unit 161, etc., described above, are mounted on the main board 107. In addition, a recording medium I / F 171 and a shake detection unit 172 are also mounted on the main board 107.

[0020] (Rear display section 175: EVF display section 176) The above-mentioned memory 153 also serves as a memory for image display (video memory). The digital imaging signal and image data written to the memory 153 are displayed as a live view image or an image capture confirmation image on a rear display unit 175 provided on the rear surface of the camera 100 or on an EVF display unit 176 located in the viewfinder via a memory control unit 154. The rear display unit 175 and the EVF display unit 176 are realized by display devices such as a liquid crystal panel or an organic EL panel.

[0021] (Operation unit 180) The operation unit 180 is an input unit that accepts operations by the user and outputs a signal corresponding to the accepted operation to the camera system control unit 150. The operation unit 180 is configured to include various operation members such as a mode changeover switch 181, a first shutter switch 183 and a second shutter switch 184 that are linked to a shutter button 182, a touch panel 185, a power switch 186, etc.

[0022] (Mode switch 181: Shutter button 182: Second shutter switch 184) The mode selector switch 181 is an operating member for switching between imaging modes such as still image capture and video capture. The shutter button 182 is an operating member for the user to issue imaging preparation instructions and imaging instructions. The first shutter switch 183 is turned "ON" when the shutter button 182 is pressed halfway, and outputs an "SW1 signal" to the camera system control unit 150. The second shutter switch 184 is turned "ON" when the shutter button 182 is pressed all the way, and outputs an "SW2 signal" to the camera system control unit 150. The camera system control unit 150 executes imaging preparation operations (autofocus, auto exposure, auto white balance, etc.) in response to receiving the "SW1 signal," and executes imaging processing of a still image for recording in response to receiving the "SW2 signal."

[0023] (Touch panel 185: Power switch 186) The operation unit 180 also includes a touch panel 185 provided on the rear display unit 175. A power switch 186 is a switch that is operated to turn on / off the power of the camera 100. Note that reference numeral 700 denotes the eye 700 of a user observing the EVF display unit 176.

[0024] (FIG. 2: Exploded perspective view of digital camera 100) (exterior materials) 2 is an exploded perspective view of camera 100 as seen obliquely from the rear. Digital camera 100 has exterior components such as a front base 102, a rear cover 101, a top cover 103, a bottom cover 104, and a side cover 105. These exterior components form the exterior surface of camera 100.

[0025] (Front base 102: Rear cover 101) The front base 102 is made of magnesium die-cast and resin, and has a mount 102a to which the lens unit 500 is attached, as well as a grip portion (not shown) that allows the user to hold the camera 100. The rear cover 101 is equipped with a plurality of operating members that can be operated by the user, and an openable and closable rear display portion 175. The rear cover 101 is also equipped with an EVF display portion 176 and a finder unit 109 (see the upper center of FIG. 2) that the user brings close to the eye 700 of the user observing the EVF display portion 176, as shown in FIG. 1.

[0026] (Top cover 103: Bottom cover 104: Side cover 105) The top cover 103 is fitted with a number of operating members (such as a mode selector switch 181, a shutter button 182, and a power switch 186 in FIG. 1) that can be operated by the user. The bottom cover 104 is formed with a battery cover that closes the opening of a battery chamber that houses a battery, and an opening for exposing a tripod mount that can be attached to the bottom surface of the front base 102. The side cover 105 is fitted with a terminal cover 105a that protects an external communication terminal 107c, which will be described later.

[0027] (chassis 110: main board 107: imaging unit 106) Arranged inside these exterior members, in order from the subject side, are a shutter 108, an imaging unit 106 having an imaging element 115 and an image shake correction mechanism, a chassis 110, and a main board 107. The imaging unit 106 includes a movable part 114 that moves the imaging element 115 orthogonal to the imaging optical axis (optical axis direction) and in two mutually orthogonal directions (yaw direction and pitch direction), and a fixed part (holding part) 113 that holds the movable part 114 so that it can move in the above two directions. In other words, the movable part 114 moves within a plane orthogonal to the optical axis direction. The fixed part 113 and the movable part 114 are not shown in FIG. 2 as they will be described later.

[0028] (Image signal FPC111: Image power supply FPC112) The imaging unit 106 is also provided with an imaging signal FPC 111 and an imaging power supply FPC 112. The imaging signal FPC 111 has wiring for transmitting imaging signals output from the imaging element 115 and control signals required to drive the imaging element 115, and these signals are sent to a camera system control unit 150 mounted on the main board 107. The imaging power supply FPC 112 has wiring for supplying power for driving the imaging element 115 from a power supply control unit 161 to the imaging element 115.

[0029] (Main board 107: recording medium connector 107b: external communication terminal 107c) The main board 107 is a multi-layer board, and various electronic components including the above-mentioned electronic elements are mounted on both sides of the main board 107. The main board 107 is fixed to the front base 102 and a metal chassis 110 with screws or the like. The main board 107 also has mounted thereon a control IC 107a that controls imaging signals, etc., a recording medium connector 107b that accommodates an external recording medium, and an external communication terminal 107c for connecting a cable to an external device.

[0030] (Heat generation from the image sensor 115) Among the components of the camera 100, the image sensor 115 consumes a particularly large amount of power, generates a large amount of heat, and is prone to temperature rise. The image capturing time of the camera 100 is limited by the guaranteed operating temperature of the image sensor 115, excluding the remaining battery charge. In order to maintain the maximum possible image capturing time, it is necessary to cool the image sensor 115 so that its temperature does not exceed the guaranteed operating temperature. For this reason, the image capturing unit 106 is fixed to the front base 102 with screws, and heat from the image capturing unit 106 is transferred to the front base 102 and cooled.

[0031] (FIG. 3: Exploded perspective view of the imaging unit 106) (Fixed part 113: Movable part 114: Sensor holder 117) 3(a) and 3(b) are exploded perspective views of the imaging unit 106 as seen from the diagonal front and diagonal rear, respectively. The imaging unit 106 has a fixed part 113 and a movable part 114. The movable part 114 is made up of an imaging element 115 and a sensor holder 117 that holds the imaging element 115. Specifically, the imaging element 115 is adhesively fixed to the center of the sensor holder 117.

[0032] (imaging substrate 115a: sensor electronics 115b: heat dissipation member 200) The imaging element 115 is configured such that a sensor chip having multiple pixels is fixed to an imaging substrate 115a by adhesive, and electrodes of the sensor chip are electrically connected to an imaging circuit on the imaging substrate 115a by wire bonding. Sensor electronic elements 115b such as capacitors, resistors, regulators, etc. that constitute the imaging circuit are mounted on the back surface (rear surface) of the imaging substrate 115a, opposite the surface on which the sensor chip is attached. Three heat dissipation members 200, which will be described later, are arranged so as to connect the movable part 114 and the fixed part 113 in the optical axis direction. Furthermore, the heat dissipation members 200 are flexible, for example, to improve the drive controllability of the movable part 114.

[0033] (sensor holder 117: fixed part 113: movable part 114) The sensor holder 117 is held by the fixed part 113 so as to be movable in two directions (horizontal and vertical directions) that are perpendicular to the imaging optical axis (optical axis direction) and perpendicular to each other. Three coils 116 are fixed to the sensor holder 117. The fixed part 113 is provided with three magnets 118 facing the three coils 116. The movable part 114 is attracted to the rear side in the imaging optical axis direction by the magnetic force of the magnets 118. Balls (not shown) held by ball holding parts 117a provided at multiple locations on the sensor holder 117 are disposed between the movable part 114 and the fixed part 113. As a result, the movable part 114 is positioned relative to the fixed part 113 in the imaging optical axis direction via the balls.

[0034] The imaging unit 106 configured in this manner can move the imaging element 115 in the two directions described above by controlling the energization of the three coils 116. The camera system control unit 150 controls (hereinafter also referred to as "drive control") the energization of the coils 116 so as to move the movable unit 114 in a direction that corrects (reduces) image blur caused by camera shake, in accordance with the camera shake detected by the shake detection unit 172. In other words, the camera 100 is equipped with an "image blur correction mechanism." Furthermore, the imaging unit 106 and the main board 107 are electrically connected using an FPC.

[0035] (heat dissipation member 200) Heat dissipation member 200 is arranged to connect movable portion 114 and fixed portion 113, and is made of a graphite sheet or the like laminated with a PET sheet or the like. Heat generated by imaging element 115 is transferred to fixed portion 113 via movable portion 114, which holds imaging element 115, and heat dissipation member 200. The heat is then transferred from fixed portion 113 to front base 102, which is fixed with screws or the like, thereby dissipating the heat generated by imaging element 115.

[0036] (Fig. 4: Perspective and cross-sectional views of the camera's main components) (Structure of the heat dissipation member 200) Next, referring to Fig. 4, a heat dissipation configuration that can be easily assembled without impeding the drive controllability of the heat dissipation member 200 to the movable part 114 will be described. Fig. 4 shows the heat dissipation member 200 fixed to the fixed part 113 and the movable part 114. Fig. 4(a) is a perspective view of the cross section, and Fig. 4(b) is a cross section. The heat dissipation member 200 is fixed to the movable part 114 by the movable-side holding part 300 (see Fig. 5), and is fixed to the fixed part 113 by the fixed-side holding part 310 (see Fig. 5).

[0037] (Movable side contact part 201: Fixed side contact part 202: Movable side holding part 300) The heat dissipation member 200 has a movable-side contact portion 201 and a fixed-side contact portion 202. The heat dissipation member 200 is in direct contact with the movable portion 114 via the movable-side contact portion 201, and is in direct contact with the fixed portion 113 via the fixed-side contact portion 202. The movable-side holding portion 300 (see FIG. 5, etc.) is made up of a movable-side holding plate 301, a movable-side adhesive member 302, and a movable-side fixed member 303.

[0038] (movable side holding plate 301: movable side adhesive member 302: movable side fixing member 303) The movable-side holding plate 301 is a plate-like member with higher rigidity than the heat dissipation member 200. The movable-side adhesive member 302 fixes the heat dissipation member 200 and the movable-side holding plate 301 relative to each other. In other words, due to the relative fixation, the movable part 114 is movable with respect to the fixed part 113, and the fixed part 113 does not hinder the movement of the movable part 114. The term "relatively fixed" is used instead of simply "fixed" to express that the movable part 114 is not fixed (i.e., the movable part 114 does not move) when viewed from the fixed part 113 (the same concept applies to "relative fixation" below). This makes it possible to grip the movable-side holding plate 301, which has higher rigidity than the heat dissipation member 200, when fixing the heat dissipation member 200 to the movable part 114. During assembly, the repulsive force of the heat dissipation member 200, the attractive force of the magnet 118, or unintended external forces may be applied, but the high rigidity of the gripping part prevents deformation of the movable-side contact part 201, improving assembly workability.

[0039] (Material of the movable side holding plate 301) From the perspective of image stabilization control, the material of the movable-side holding plate 301 is preferably non-magnetized and has excellent thermal conductivity. In this embodiment, aluminum with a thickness of approximately 0.5 mm is used. However, if the heat dissipation performance of the heat dissipation member 200 is sufficient for the amount of heat generated by the image sensor 115, the material of the movable-side holding plate 301 may be a resin such as polycarbonate from the perspective of weight reduction. The movable-side fixing member 303 is a member for fixing the heat dissipation member 200 and the movable-side holding unit 300 to the movable unit 114. In this embodiment, they are fixed with screws, but they may also be fixed by, for example, thermal caulking or UV adhesive, as long as the heat dissipation member 200 and the movable unit 114 are fixed relative to each other.

[0040] (Fixed-side holding portion 310: Fixed-side holding plate 311: Fixed-side adhesive member 312: Fixed-side fixing member 313) 5, the fixed-side holding section 310 has a fixed-side holding plate 311, a fixed-side adhesive member 312, and a fixed-side fixing member 313. The fixed-side holding plate 311 is a plate-shaped member that is more rigid than the heat dissipation member 200, similar to the movable-side holding plate 301. The fixed-side adhesive member 312 fixes the heat dissipation member 200 and the fixed-side holding plate 311 relative to each other. This makes it possible to grip the fixed-side holding plate 311, which has higher rigidity than the heat dissipation member 200, when fixing the heat dissipation member 200 to the fixed section 113. As a result, as with the movable side, unintended deformation of the fixed-side contact section 202 during assembly can be prevented, improving the ease of assembly.

[0041] (Material of fixed side holding plate 311) Like the movable-side holding plate 301, the material of the fixed-side holding plate 311 is preferably a material that is not magnetized and has excellent thermal conductivity, from the perspective of image shake correction control. In this embodiment, it is made of aluminum with a thickness of approximately 0.5 mm. The fixed-side fixing member 313 is a member for fixing the heat dissipation member 200 and the fixed-side holding part 310 to the fixed part 113. In this embodiment, like the movable-side fixing member 303, they are fixed with screws, but as long as the heat dissipation member 200 and the fixed part 113 are sufficiently fastened, they may also be fixed by, for example, thermal caulking or UV adhesive.

[0042] In this embodiment, heat generated by the imaging element 115 is transferred to the movable part 114, spreads from the movable-side contact part 201 to the heat dissipation member 200, and is then diffused and dissipated throughout the entire digital camera 100 via the fixed-side contact part 202 and the fixed part 113. In the configuration of the movable part 114 and the heat dissipation member 200, there is no intervening member between the two members, so heat can be dissipated more efficiently than when another member is interposed, achieving ease of assembly, heat dissipation, and controllability. The same applies to the configuration of the fixed part 113 and the heat dissipation member 200.

[0043] Although one heat dissipation member 200 has been described with reference to Fig. 4, in this embodiment, three heat dissipation members 200 are arranged as shown in Fig. 3, and the remaining two have the same configuration. Also, the movable-side fixing member 303 is attached from the light-receiving surface side of the image sensor 115, and the fixed-side fixing member 313 is attached from the side opposite to the light-receiving surface side.

[0044] (FIG. 5: Exploded perspective view of camera 100) Next, the assembly configuration of the heat dissipation member 200, the movable-side holding part 300, and the fixed-side holding part 310 will be described with reference to Fig. 5. Fig. 5(a) is an exploded perspective view showing the assembled state of the heat dissipation member 200 and the holding parts, and Fig. 5(b) is an exploded perspective view showing the assembled state of the movable part 114, the fixed part 113, and the heat dissipation member 200.

[0045] (Movable side holding plate 301: Movable side adhesive member 302) Three through holes are provided in the movable-side holding plate 301 and the movable-side adhesive member 302. The number of through holes may be four or more. The penetration direction of the three through holes shown in FIG. 5 is perpendicular to the moving direction of the movable part 114. During assembly, screws inserted through the movable-side fixing member 303 and two positioning shapes (protrusions) provided on the movable part 114 are inserted into each through hole, thereby positioning and fixing the movable-side holding part 300 and the movable part 114. The penetration direction of the through holes is the optical axis direction, which is perpendicular to the moving direction of the movable part 114. Therefore, the force applied to the movable-side holding part 300 during assembly and fixing is a force perpendicular to the moving direction.

[0046] As a result, no force is applied to the movable part 114 in the moving direction, so the movable part 114 does not move during assembly and fixing, allowing for stable fixing work. In particular, when the heat dissipation members 200 are arranged on multiple different sides (the upper side and right side of the fixed part 113 in FIG. 3(b)) as shown in FIG. 3, if the movable part 114 moves during assembly and fixing, it becomes difficult to fix the multiple heat dissipation members 200. For this reason, this configuration in which the fixing direction is vertical is effective in improving assembly. In other words, the movable-side holding plate 301 (first holding plate) and the fixed-side holding plate 311 (second holding plate) are fixed in the optical axis direction, improving assembly work.

[0047] For the same reason as the movable side, at least three through holes are provided in the fixed-side holding plate 311 and the fixed-side adhesive member 312. Note that three through holes are shown in Fig. 5. Furthermore, in this embodiment, the heat dissipation member 200 is fixed to the movable-side fixing member 303 and the fixed-side fixing member 313 with screws, which has the advantage of facilitating disassembly and reassembly.

[0048] Also, in FIG. 5(b), the movable side holding part 300 and the fixed side holding part 310 need to be spaced apart to a certain extent. They need to be spaced apart at least by the longer of A and B below. "A" is "(the distance in the optical axis direction between the movable side contact part 201 and the fixed side contact part 202) + (the height of the positioning shape provided on the movable part 114 or the fixed part 113)". "B" is "(the distance in the optical axis direction between the movable side contact part 201 and the fixed side contact part 202) + (the height of the positioning shape provided on the movable part 114 or the fixed part 113)". 2 + (movable distance of movable part 114) 2} 0.5". This prevents the heat dissipation member 200 from being pulled more than necessary and breaking. From the viewpoint of controllability of the image blur correction device, it is preferable that the distance is even longer. As another aspect from the viewpoint of controllability of the image blur correction device, the distance between the movable-side holding plate 301 and the fixed-side holding plate 311 can be made longer than "the distance between the fixed part 113 and the movable part 114 + the movable distance of the movable part 114." Furthermore, the length of the heat dissipation member 200 between the movable-side holding plate 301 (first holding plate) and the fixed-side holding plate 311 (second holding plate) can be made longer than the distance between the movable part 114 and the fixed part 113.

[0049] (Modification 1: Grip member 320) Next, referring to Fig. 6, a configuration in which a gripping member 320 is used at the contact portion between the movable part 114 and the heat dissipation member 200 will be described as Modification 1 of the present invention. Fig. 6(a) is a perspective view of Modification 1, and Figs. 6(b) and 6(c) are cross-sectional views of Modification 1. Modification 1 further includes a gripping member 320. As shown in Fig. 6(a), the gripping member 320 is provided near the movable-side fixing member 303 that is provided so as to cover a portion of the heat dissipation member 200. In other words, the gripping member 320 is provided near the movable-side fixing member 303 that fixes the heat dissipation member 200 and the movable part 114.

[0050] (Cross section of variant 1: movable side) 6(b) is a cross-sectional view of the movable-side holding part 300, the fixed-side holding part 310, etc. in Modification 1. Regarding the movable side, the heat dissipation member 200 is fixed to the movable part 114 by a movable-side fixing member 303 via a movable-side adhesive member 302 and a movable-side holding plate 301.

[0051] (Cross section of variant 1: fixed side) Similarly, on the fixed side, the heat dissipation member 200 is fixed to the fixed portion 113 by the fixed-side fixing member 313 via the fixed-side adhesive member 312 and the fixed-side holding plate 311. As shown in Fig. 6(b) , the fixed-side end of the heat dissipation member 200 is fixed to the fixed portion 113 by the fixed-side adhesive member 312. Here, two fixed-side adhesive members 312 are used, but one large adhesive member may also be used.

[0052] (FIG. 6(c): Configuration of the gripping member 320) The configuration of the gripping member 320 will be described with reference to Figure 6(c). The gripping member 320 has a U-shape and is arranged so as to sandwich a part of the movable part 114 from both sides together with the movable-side contact part 201 (see Figure 4, etc.) of the heat dissipation member 200. This results in a direct thermal connection between the heat dissipation member 200 and the movable part 114. This makes it possible to dissipate heat from the movable part 114 from the movable-side contact part 201 to the heat dissipation member 200.

[0053] The gripping member 320 is configured to be fixed to the movable part 114 while being pushed out from the light receiving surface side of the image sensor 115 (the upper side in FIG. 6(c)). As with the above-described movable-side fixed member 303, the fixing direction is perpendicular to the driving direction of the movable part 114, which makes assembly and fixing easy. Note that, although a metal plate is used for the gripping member 320 in Modification 1, it may be made of resin, rubber, or the like as long as it is capable of gripping the movable part 114 together with the movable-side contact part 201. Note that, compared to the above-described embodiment, Modification 1 allows for a larger bending radius of the heat dissipation member 200, which is advantageous from the viewpoint of controllability of "image shake correction."

[0054] (Modification 2: FIG. 7; second heat dissipation member) Next, a configuration further including a second heat dissipation member will be described with reference to FIG. 7. FIG. 7(a) is a perspective view of Modification 2, FIG. 7(b) is a cross-sectional perspective view of Modification 2, and FIG. 7(c) is a cross-sectional view. In Modification 2, the second heat dissipation member 330 is made of a graphite sheet or the like laminated with a PET sheet or the like, and as shown in FIG. 7(a), the second heat dissipation member 330 is arranged to connect the heat dissipation member 200 and the front base 102. The thermal connection configuration between the movable part 114 and the heat dissipation member 200 in Modification 2 is the same as that shown in FIG. 4. As shown in FIG. 7(b), they are in direct contact via the movable-side contact part 201. However, as in FIG. 6(b), a movable-side holding plate 301 may be arranged between the movable part 114 and the heat dissipation member 200.

[0055] (Second heat dissipation member 330: heat source side connecting portion 331: base side connecting portion 332: heat source side fixing member 333) The second heat dissipation member 330 has a heat-source-side connection portion 331 and a base-side connection portion 332. As shown in FIG. 7( c), the heat-source-side connection portion 331 overlaps the fixed-side contact portion 202, the fixed-side adhesive member 312, the fixed-side holding plate 311, and the fixed portion 113 in that order in the optical axis direction, and is fixed to the fixed portion 113 by a heat-source-side fixing member 333. With this configuration, the heat dissipation member 200 and the second heat dissipation member 330 are in direct contact with each other, so that heat from the image sensor 115 can be more efficiently dissipated to the front base 102. When the heat-source-side connection portion 331 is fixed by the heat-source-side fixing member 333, it may be fixed by a separate holding plate (not shown) to improve assembly workability.

[0056] (FIG. 7(c): Base-side connection part 332) 7(c) shows the state in which the base-side connection portion 332 comes into contact with the front base 102. The base-side connection portion 332 is in contact with and fixed to the front base 102 by a fixing member (not shown). Examples of the fixing member (not shown) include screws, double-sided tape, etc.

[0057] In Modification 2, heat generated from the imaging element 115 is transferred from the movable part 114 to the heat dissipation member 200, and then transferred directly to the second heat dissipation member 330 without passing through the fixed part 113 as described above, and is then diffused to the front base 102. Therefore, the heat from the imaging element 115 can be quickly transferred to the front base 102. As a result, heat can be efficiently diffused inside the camera 100. Furthermore, from the perspective of ease of assembly, the base-side connection part 332 is arranged in an area that does not overlap with the movable part 114 in the optical axis direction.

[0058] In Modification 2, the material of the second heat dissipation member 330 is a graphite sheet, but metal sheeting or the like may be used as long as the heat dissipation performance is sufficient. In this case, by configuring the second heat dissipation member 330 to be pressed against the front base 102, it is possible to eliminate the need for a fixing member (not shown) provided at the contact portion between the base-side connection portion 332 and the front base 102. Furthermore, although the heat-source-side fixing member 333 is a screw, a member such as double-sided tape fixed with an adhesive may be used between the heat-source-side connection portion 331 and the fixed-side holding plate 311 as long as the heat dissipation performance to the front base 102 is sufficient.

[0059] In this way, the optical fiber 100 includes the fixed portion 113 and the second heat dissipation member 330 that is disposed near the fixed portion 113 and connects the front base 102 (base portion). The front base 102 and the second heat dissipation member 330 are thermally connected in a region where the movable portion 114 and the front base 102 do not overlap in the optical axis direction. In addition, the fixed portion 113, the heat dissipation member 200, and the second heat dissipation member 330 can be configured to be thermally connected in at least a part of the region where they overlap in the optical axis direction.

[0060] (Modification 3: FIG. 8: Bent portion 311a: Most convex portion 203) Next, referring to FIG. 8, a case where the fixed-side holding plate 311 of Modification 3 has a bent portion 311a will be described. FIG. 8 is a cross-sectional view of Modification 3. The fixed-side holding plate 311 has a bent portion that bends in the optical axis direction, and a bent portion 311a that extends beyond the bent portion is formed. The bent portion 311a is bent in the direction from the fixed portion 113 toward the movable portion 114. The height of the bent portion 311a (vertical direction in FIG. 8) is configured to be higher than the most convex portion 203, which is the most convex portion of the heat dissipation member 200. In Modification 3, the height position of the bent portion 311a is closer to the movable-side contact portion 201 than the center between the movable-side contact portion 201 and the fixed-side contact portion 202.

[0061] That is, in Modification 3, fixed-side holding plate 311 (second holding plate) has bent portion 311a bent in the optical axis direction. The width of bent portion 311a in the optical axis direction is defined as the "height," and the height of bent portion 311a is greater than the most convex portion of heat dissipation member 200, which is U-shaped.

[0062] Furthermore, the bent portion 311a is always located outside (to the right in FIG. 8) the most convex portion 203. In other words, when the image sensor 115 is located at the center of the optical axis, the gap between the most convex portion 203 and the bent portion 311a is wider than half the drive amount of the movable portion 114. This prevents contact between the heat dissipation member 200 and the bent portion 311a, preventing a decrease in controllability of the "image stabilization mechanism." Furthermore, even if the heat dissipation member 200 moves to the right in FIG. 8 for some reason, such as when the movable portion 114 is being driven and controlled to move, the bent portion 311a acts as a stopper.

[0063] By providing such bent portion 311a, it is possible to prevent heat dissipation member 200 from accidentally coming into contact with surrounding components (such as front base 102) and being damaged during assembly or when camera 100 is turned off.

[0064] The above-described embodiment and modifications are merely representative of the present invention, and various modifications and alterations are possible when implementing the present invention. For example, a configuration may be adopted in which a portion of the heat dissipation member 200 is in direct contact with the movable portion 114.

[0065] <Additional Note> The disclosure of this embodiment includes the following configuration. (Configuration 1) An imaging device having a movable part that holds an imaging element and a fixed part that fixes the movable part so that it can move in a direction perpendicular to the optical axis direction, a heat dissipation member connecting the movable portion and the fixed portion; a first holding plate that is integrally held with the heat dissipation member; a second holding plate that is integrally held with the heat dissipation member and is different from the first holding plate, the first holding plate is fixed to the movable portion and the second holding plate is fixed to the fixed portion, The imaging device is characterized in that the first holding plate and the second holding plate are fixed in the optical axis direction. (Configuration 2) The device further includes a movable-side fixing member that fixes the first holding plate and the movable portion, and a fixed-side fixing member that fixes the second holding plate and the fixed portion, The imaging device according to configuration 1, wherein the movable-side fixed member is attached from the light-receiving surface side of the imaging element, and the fixed-side fixed member is attached from the side opposite to the light-receiving surface side. (Configuration 3) The imaging device described in configuration 1 or 2, characterized in that the distance between the first holding plate and the second holding plate is longer than the distance between the fixed part and the movable part plus the movable distance of the movable part. (Configuration 4) The imaging device according to configuration 1 or 2, wherein the first holding plate and the second holding plate are made of a non-magnetized metal plate. (Configuration 5) The imaging device according to configuration 1 or 2, wherein a plurality of the heat dissipation members are attached. (Configuration 6) The imaging device according to configuration 1 or 2, wherein a part of the heat dissipation member is in direct contact with the movable part. (Configuration 7) A second heat dissipation member is further provided, which connects the fixing portion and a base portion disposed near the fixing portion, 3. The imaging device according to configuration 1 or 2, wherein the base portion and the second heat dissipation member are thermally connected in a region where the movable portion and the base portion do not overlap in the optical axis direction. (Configuration 8) The imaging device according to configuration 7, wherein the fixed portion, the heat dissipation member, and the second heat dissipation member are thermally connected in at least a part of the region where they overlap in the optical axis direction. (Configuration 9) The imaging device according to configuration 1 or 2, further comprising a gripping member in the vicinity of the heat dissipation member and the movable-side fixing member that fixes the movable portion. (Configuration 10) The second holding plate further includes a bent portion bent in the optical axis direction, The imaging device described in configuration 1 or 2, characterized in that the height is defined as the distance in the optical axis direction, and the height of the bent portion is higher than the most convex portion, which is the most convex part of the heat dissipation member, which is U-shaped.

[0066] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0067] 100 digital cameras 101 Rear cover 102 Front Base 103 Top cover 104 bottom cover 105 side cover 106 Imaging unit 108 Shutter 113 Fixed part 114 Moving parts 115 Image sensor 115a Imaging board 115b Sensor electronic elements 116 Coil 118 Magnet 117 Sensor holder 152 Image processing section 153 memory 154 Memory control unit 150 Camera system control unit 155 Non-volatile memory 157 System Timer 156 system memory 172 Shake detection unit 113 Fixed part 200 Heat dissipation material 201 Movable side contact part 202 Fixed side contact part 203 Most convex part 300 Movable side holding part 301 Movable side holding plate 302 Movable side adhesive member 303 Movable side fixed member 301 Movable side holding plate 310 Fixed side holding part 311 Fixed side retaining plate 311a Bending part 312 Fixed side adhesive member 313 Fixed side fixing member 320 Gripping member 330 Second heat dissipation member 331 Heat source side connection 332 Base side connection part 333 Heat source side fixing member 500 lens unit 501 Lens 503 Aperture 504 Aperture drive circuit 502 Lens driver circuit 505 Lens control unit

Claims

1. An imaging device having a movable part that holds an imaging element and a fixed part that fixes the movable part so that the movable part can move in a direction perpendicular to an optical axis direction, a heat dissipation member connecting the movable portion and the fixed portion; a first holding plate that is integrally held with the heat dissipation member; a second holding plate that is integrally held with the heat dissipation member and is different from the first holding plate, the first holding plate is fixed to the movable portion and the second holding plate is fixed to the fixed portion, The imaging device is characterized in that the first holding plate and the second holding plate are fixed in the optical axis direction.

2. the actuator further includes a movable-side fixing member that fixes the first holding plate and the movable portion, and a fixed-side fixing member that fixes the second holding plate and the fixed portion, 2. The imaging device according to claim 1, wherein the movable-side fixed member is attached to the light-receiving surface side of the imaging element, and the fixed-side fixed member is attached to the side opposite to the light-receiving surface side.

3. 3. The imaging device according to claim 1, wherein the distance between the first holding plate and the second holding plate is longer than the sum of the distance between the fixed portion and the movable portion and the movable distance of the movable portion.

4. 3. The imaging device according to claim 1, wherein the first holding plate and the second holding plate are made of a non-magnetized metal plate.

5. 3. The imaging device according to claim 1, wherein a plurality of the heat dissipation members are attached.

6. 3. The imaging device according to claim 1, wherein a part of the heat dissipation member is in direct contact with the movable portion.

7. a second heat dissipation member connecting the fixing portion and a base portion disposed near the fixing portion; 3. The imaging device according to claim 1, wherein the base portion and the second heat dissipation member are thermally connected in a region where the movable portion and the base portion do not overlap in the optical axis direction.

8. 8. The imaging device according to claim 7, wherein the fixed portion, the heat dissipation member, and the second heat dissipation member are thermally connected in at least a part of an area where they overlap in the optical axis direction.

9. 3. The imaging device according to claim 1, further comprising a gripping member disposed near the heat dissipating member and the movable-side fixing member that fixes the movable portion.

10. the second holding plate further includes a bent portion bent in the optical axis direction, The imaging device according to claim 1 or 2, characterized in that the height is defined as the distance in the optical axis direction, and the height of the bent portion is higher than the most convex portion, which is the most convex part of the heat dissipation member, which is U-shaped.

Images