Shake correction device

Abstract

Provided is a shake correction device that can be made lighter and lower in cost. This shake correction device drives an imaging element (210) via a drive mechanism and performs shake correction. The shake correction device comprises: a fixed part (102) provided with magnets (113b, 115b, 117b), a first yoke (103), and a second yoke (105), which together constitute a drive mechanism (voice coil motor); and a movable part (101) having a holding member (104) for holding the imaging element (210) and coils (113a, 115a, 117a) that constitute a drive mechanism, the movable part (101) movably supporting the holding member (104). The imaging element (210) and the holding member (104) are bonded by first adhesives (150a, 150b).

Description

Image stabilization device

[0001] The present invention relates to a vibration reduction device, and more particularly to a vibration reduction device that corrects image blur by driving an image sensor.

[0002] Conventional image stabilization devices of this type have been proposed in Japanese Patent Application Laid-Open Nos. 2003-222999 and 2003-222999.

[0003] The image stabilization mechanism described in Patent Document 1 uses a piezoelectric actuator as a drive mechanism for the image sensor, and performs image stabilization by moving the image sensor in directions perpendicular to the optical axis on a plane perpendicular to the optical axis. In particular, the image stabilization mechanism described in Patent Document 1 is characterized by having a heat dissipation mechanism that dissipates heat from the image sensor into the gas phase from the back surface of the image sensor.

[0004] Although Patent Document 1 describes that the imaging element (a substrate having the imaging element) is held by an imaging element holder, it does not describe a method for fixing the imaging element to the imaging element holder.

[0005] The image stabilization device described in Patent Document 2 is characterized by including a base portion, a movable portion that holds an imaging element, a support ball that is disposed between the movable portion and the base portion and that movably supports the movable portion relative to the base portion and is made of a magnetic material, a drive portion that includes a coil and a magnet and that moves the movable portion relative to the base portion by electromagnetic force, and a shield portion that is made of a magnetic material and surrounds the outside of the rolling range of the support ball and covers more than half of the support ball in the optical axis direction when viewed from a direction perpendicular to the optical axis.By surrounding the outside of the rolling range of the support ball made of a magnetic material with the shield portion made of a magnetic material, the image stabilization device described in Patent Document 2 reduces or eliminates the effect of magnetic force acting on the support ball, even when a support ball made of a magnetic material is used, making it possible to easily and accurately control the position of the movable portion.

[0006] Incidentally, the movable part described in Patent Document 2 is described as being made up of an imaging element holding part that holds the imaging element and an approximately L-shaped holder that holds the coil, and is fixed with screws and adhesive, but does not describe a method for fixing the imaging element and the coil.

[0007] JP 2008-64863 A JP 2011-4075 A

[0008] One embodiment of the technique of the present disclosure provides a vibration reduction device that can be made lighter and less expensive.

[0009] A first aspect of the invention is a vibration reduction device that performs vibration reduction by driving an imaging element with a drive mechanism, the vibration reduction device comprising: a fixed part that includes a magnet and a yoke that constitute the drive mechanism; and a movable part that has a holding member that holds the imaging element and a coil that constitutes the drive mechanism and movably supports the holding member, wherein the imaging element and the holding member are bonded together with a first adhesive.

[0010] A second aspect of the present invention provides the image stabilizer of the first aspect, wherein the drive mechanism is a voice coil motor.

[0011] A third aspect of the present invention provides the image stabilizer of the first aspect, wherein the movable portion supports the holding member movably relative to the fixed portion within a plane parallel to the imaging surface of the imaging element.

[0012] A fourth aspect of the present invention provides the image stabilizer of the first aspect, wherein the holding member is preferably a resin member molded from a highly thermally conductive resin.

[0013] A fifth aspect of the present invention provides the image stabilizer of the fourth aspect, wherein the thermal conductivity of the highly thermally conductive resin is 2 (W / m / K) or more.

[0014] A sixth aspect of the present invention provides the image stabilizer of the fourth aspect, wherein the thermal conductivity of the highly thermally conductive resin is preferably 3 (W / m / K) or more.

[0015] A seventh aspect of the present invention provides the image stabilizer of the fourth aspect, wherein the highly thermally conductive resin is preferably a resin containing a fibrous filler.

[0016] An eighth aspect of the present invention provides the image stabilizer of the seventh aspect, wherein the holding member is preferably molded in a frame shape, and the fibrous filler in the holding member is oriented in a direction that follows the frame shape.

[0017] A ninth aspect of the present invention provides the image stabilizer of the first aspect, wherein the holding member is preferably a resin member molded from a conductive resin.

[0018] A tenth aspect of the present invention provides the image stabilizer of the fourth aspect, wherein the holding member is preferably a resin member molded from a conductive resin.

[0019] A vibration reduction device according to an eleventh aspect of the present invention is based on any one of the first to tenth aspects, and it is preferable that the holding member has a shape that increases the bonding area of ​​the first adhesive.

[0020] A twelfth aspect of the present invention provides the image stabilizer of the eleventh aspect, wherein a first adhesive is applied to the shape.

[0021] A thirteenth aspect of the present invention provides the image stabilizer of the eleventh aspect, wherein the shape is preferably an uneven shape.

[0022] A fourteenth aspect of the present invention provides the image stabilizer of the thirteenth aspect, wherein the holding member preferably has a plurality of concave and convex shapes.

[0023] A fifteenth aspect of the present invention provides the image stabilizer of the fourteenth aspect, wherein the holding member is formed in a frame shape, and preferably has a plurality of concave and convex shapes on at least two sides of the frame shape.

[0024] In the image stabilization device according to the sixteenth aspect of the present invention, in the first aspect, the holding member preferably includes a restricting member that restricts the range of movement of the movable part by abutting against the fixed part, and the first adhesive is preferably applied between the image sensor and the holding member, the image sensor being spaced a first distance or more from the restricting member.

[0025] A seventeenth aspect of the present invention relates to a vibration reduction device in the sixteenth aspect, wherein the holding member has a shape that increases the adhesion area of ​​the first adhesive, and the shape that increases the adhesion area of ​​the first adhesive is preferably spaced a first distance or more from the regulating member.

[0026] In the image stabilizer according to an eighteenth aspect of the present invention, in the first aspect, it is preferable that the first adhesive is an ultraviolet curing adhesive.

[0027] A vibration reduction device according to a nineteenth aspect of the present invention is the sixteenth aspect, wherein a second adhesive having a lower hardness than the first adhesive is applied to a location different from the location to which the first adhesive is applied.

[0028] A twentieth aspect of the present invention provides a vibration reduction device according to the nineteenth aspect, wherein the holding member has a shape that increases the bonding area of ​​the first adhesive, and the different locations are locations excluding the shape that increases the bonding area of ​​the first adhesive.

[0029] A twenty-first aspect of the present invention provides a vibration reduction device according to any one of the fourth to tenth aspects, wherein the screw hole formed in the holding member is preferably a non-through hole that is deeper than the length of the male screw.

[0030] A twenty-second aspect of the image stabilization device of the present invention is any one of the first to tenth aspects, wherein the holding member has a second opening in which the coil is disposed, outside the first opening in which the imaging element is disposed, and a first adhesive is filled between the coil and the inner peripheral surface of the second opening.

[0031] A twenty-third aspect of the present invention is directed to a motion compensation device according to the twenty-second aspect, wherein the second opening has a first opening shape in which the periphery of the second opening is closed, or a second opening shape in which part of the periphery of the second opening is open.

[0032] FIG. 1 is a perspective view of an imaging device to which a vibration reduction device according to the present invention is applied, as seen from an oblique front. FIG. 2 is a block diagram showing an embodiment of the internal configuration of the imaging device shown in FIG. 1. FIG. 3 is a front perspective view of the vibration reduction device. FIG. 4 is a rear perspective view of the vibration reduction device. FIG. 5 is a front perspective view of a fixed portion of the vibration reduction device. FIG. 6 is a rear perspective view of a movable portion of the vibration reduction device. FIG. 7 is a rear view of a holding member constituting the movable portion. FIG. 8 is a front view of a holding member constituting the movable portion. FIG. 9 is a graph showing an example of the raw materials of the holding member and the temperature rise of an imaging element (CMOS) versus usage time. FIG. 10 is a rear view of a holding member to which an imaging element is adhesively fixed. FIG. 11 is a rear view of a holding member to which an imaging element is adhesively fixed, particularly showing the area around the imaging element and the area close to a restricting member. FIG. 12 is a perspective view of a portion of the holding member shown in FIG. 10. FIG. 13 is a schematic diagram showing another embodiment of the movable portion. FIG. 14 is a cross-sectional view of a main portion of the holding member, including cross sections of screw holes formed in the holding member. FIG. 15 is a diagram showing a configuration for fastening a flexible printed circuit board connected to the rear side of the imaging element to the holding member.

[0033] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the image stabilization device according to the present invention will now be described with reference to the accompanying drawings.

[0034] [Image Capture Apparatus] <External Appearance of Image Capture Apparatus> FIG. 1 is a perspective view of an image capture apparatus including a motion compensation device according to the present invention, as seen obliquely from the front.

[0035] As shown in FIG. 1, the imaging device 10 is a mirrorless digital single-lens camera that includes an interchangeable lens 12 and a camera body 200 to which the interchangeable lens 12 is detachable.

[0036] 1, a body mount 262 to which the interchangeable lens 12 is attached is provided on the front of the camera body 200, and the top surface of the camera body 200 is mainly provided with a shutter release button 22, a shutter speed dial 23, an exposure compensation dial 24, and a power lever 25. Reference numeral 262A denotes a contact point connected to the interchangeable lens 12.

[0037] Furthermore, on the back surface (not shown) of the camera body 200, an LCD (liquid crystal display) 290 (FIG. 2), a MENU / OK key, a cross key, a playback button, and the like are provided.

[0038] The LCD 290 displays a live view image in the shooting mode, plays back and displays a captured image in the playback mode, and also functions as a display that displays various menu screens.

[0039] Furthermore, a shake detection sensor 270 is provided on the camera body 200 .

[0040] The shake detection sensor 270 is composed of a gyro sensor (angular velocity sensor) and an acceleration sensor. As shown in FIG. 1, if the left-right direction of the camera body 200 is the X-axis, the up-down direction of the camera body 200 is the Y-axis, and the optical axis direction is the Z-axis, the angular velocity sensor detects the angular velocity around the X-axis (tilt direction), the angular velocity around the Y-axis (pan direction), and the angular velocity around the Z-axis (roll direction), and the acceleration sensor detects the acceleration in the X-axis direction and the Y-axis direction.

[0041] <Internal Configuration of Imaging Apparatus> FIG. 2 is a block diagram showing an embodiment of the internal configuration of the imaging apparatus shown in FIG.

[0042] 2, camera body 200 constituting imaging device 10 includes an image sensor 210, image stabilization device 100 according to the present invention, an AFE (Analog Front End) 220, a shake control unit 230, a processor 240, a display driver 250, a memory 260, a shake detection sensor 270, an operation unit 280, and an LCD 290.

[0043] The imaging element 210 is configured by a CMOS (Complementary Metal-Oxide Semiconductor) color image sensor. Note that the imaging element 210 is not limited to a CMOS type, and may be a CCD (Charge Coupled Device) type image sensor.

[0044] The image sensor 210 has red (R), green (G), and blue (B) color filters arranged in a periodic color array (e.g., Bayer array, X-Trans (registered trademark), etc.) on a plurality of pixels composed of photoelectric conversion elements (photodiodes) arranged two-dimensionally in the x direction (horizontal direction) and y direction (vertical direction), and a microlens is arranged on each photodiode.

[0045] An optical image of a subject formed on the light receiving surface of the image sensor 210 by the imaging optical system of the interchangeable lens 12 is converted into an electrical signal by the image sensor 210. Charges corresponding to the amount of incident light are accumulated in each pixel of the image sensor 210, and an electrical signal corresponding to the amount of charge (signal charge) accumulated in each pixel is read out from the image sensor 210 as an image signal.

[0046] Image stabilization device 100 drives image sensor 210 with a drive mechanism to perform image stabilization, and corrects image blur caused by blur in five directions, namely, pan, tilt, roll, up / down, and left / right, of camera body 200. The detailed configuration of image stabilization device 100 will be described later.

[0047] The shake control unit 230 receives as input shake detection signals that indicate angular velocities about the X-axis, Y-axis, and Z-axis, and accelerations in each direction of the X-axis and Y-axis, which are detected by the shake detection sensor 270 while an image (still image, video) is being captured, as well as position detection signals from a plurality of position detection sensors (Hall sensors) that detect the position of the movable part (movable part that holds the image sensor 210) relative to the fixed part of the image stabilization device 100, and based on these shake detection signals and position detection signals, controls the magnitude and direction of the current flowing in each coil of the drive mechanism (in this example, a voice coil motor) of the image stabilization device 100, and moves the image sensor 210 so as to cancel out the shake.

[0048] The processor 240 is composed of a CPU (Central Processing Unit) and the like, and controls all the components of the camera body 200 in accordance with user operations using the operation unit 280, and performs various types of processing.

[0049] The operation unit 280 includes the shutter release button 22, shutter speed dial 23, exposure compensation dial 24, and power lever 25 shown in FIG. 1, as well as a MENU / OK key, a cross key, a playback button, and the like (not shown).

[0050] The memory 260 includes a flash memory, a read-only memory (ROM), a random access memory (RAM), etc. The memory 260 also includes a memory card that is detachable from the camera body 200. The flash memory and ROM are non-volatile memories that store firmware and other programs, and the flash memory stores captured images (still images, videos), etc.

[0051] The RAM functions as a work area for processing by the processor 240, and also temporarily stores firmware and other programs stored in the non-volatile memory. Note that the processor 240 may have part of the memory 260 (RAM) built in.

[0052] An image sensor driving unit (not shown) of the image sensor 210 controls the reading of image signals from the image sensor 210 in accordance with commands from the processor 240. The image sensor driving unit also has an electronic shutter function that, in response to an electronic shutter control signal from the processor 240, discharges (resets) the electric charges accumulated in each pixel of the image sensor 210 and starts exposure.

[0053] The AFE 220 performs various analog signal processing on an analog image signal obtained by capturing an image of a subject with the image sensor 210, and converts the processed image signal into a digital image signal. The analog processing in the AFE 220 includes, for example, color separation processing and AGC (Automatic Gain Control). The AGC functions as a sensitivity adjustment unit that adjusts the sensitivity (ISO sensitivity (ISO: International Organization for Standardization)) during shooting, and adjusts the gain of an amplifier that amplifies the input image signal so that the signal level of the image signal falls within an appropriate range.

[0054] When capturing a still image or a video, image data for each RGB pixel (mosaic image data) output via the image sensor 210 and the AFE 220 is input to and temporarily stored in the memory 260. Note that when the image sensor 210 is a CMOS image sensor, the AFE 220 is often built into the image sensor 210.

[0055] The processor 240 also functions as a digital signal processing unit that performs various types of digital signal processing on image data temporarily stored in the memory 260. That is, the processor 240 performs digital signal processing such as offset processing, gain control processing including sensitivity correction, gamma correction processing, demosaicing processing (also called demosaicing processing or synchronization processing), and RGB / YCrCb conversion processing on the image data input via the AFE 220, and stores the image data after digital signal processing back in the memory 260. Note that, for example, in the case of the image sensor 210 having RGB three-color filters, the demosaicing processing is a process of calculating all RGB color information for each pixel from a mosaic image made up of RGB, and generating synchronized RGB three-plane image data from the mosaic data (dot-sequential RGB data).

[0056] The RGB / YCrCb conversion process is a process for converting the synchronized RGB data into luminance data (Y) and color difference data (Cr, Cb).

[0057] Furthermore, when recording still images or moving images, the processor 240 performs a compression process on the uncompressed luminance data Y and color difference data Cb, Cr temporarily stored in the RAM of the memory 260. In the case of still images, the data is compressed in, for example, JPEG (Joint Photographic Coding Experts Group) format, and in the case of moving images, the data is compressed in, for example, H.264 format. The compressed image data is recorded in the flash memory of the memory 260. In addition, in playback mode, the processor 240 reads the compressed image data from the flash memory of the memory 260, performs an expansion process on the read image data, generates uncompressed image data, and displays it on the LCD 290 or the like via the display driver 250.

[0058] When displaying a live view image on the LCD 290, the processor 240 outputs digital image signals that have been captured at a predetermined frame rate (e.g., 30 fps or 60 fps) and digitally processed to the display driver 250. The display driver 250 converts the input time-series digital image signals into a signal format for display and outputs them sequentially to the LCD 290. As a result, the captured image is displayed on the LCD 290 in real time.

[0059] The shutter release button 22 is a shooting instruction unit for inputting instructions to shoot still images and videos, and is configured as a two-stage stroke switch consisting of a so-called "half-press" (S1 press) and a "full press" (S2 press).

[0060] When the shutter release button 22 is "half-pressed," an S1_ON signal is output, and when the shutter release button 22 is further pressed from the "half-press" position to the "full press," an S2_ON signal is output. In the still image shooting mode, when the S1_ON signal is output, the processor 240 executes shooting preparation processes such as AF control (automatic focus adjustment) and AE control (automatic exposure control), and when the S2_ON signal is output, it executes still image shooting and recording processes.

[0061] When performing AF control, the processor 240 calculates values ​​necessary for AF control based on the digital image signal. In the case of so-called contrast AF, for example, the processor 240 calculates an integrated value (focus evaluation value) of the high-frequency components of the G signal within a predetermined AF area. The processor 240 moves the focus lens included in the lens group of the interchangeable lens 12 to a position where the focus evaluation value is maximized (i.e., the position where the contrast is maximized) during AF control. Note that the AF is not limited to contrast AF. For example, phase difference AF may be performed, in which the amount of defocus is detected based on pixel data from phase difference detection pixels provided in the image sensor, and the focus lens is moved so that this defocus amount becomes zero.

[0062] When performing AE control, the processor 240 detects the brightness of the subject (subject luminance) and calculates a numerical value (exposure value (EV value)) necessary for AE control corresponding to the subject luminance. The processor 240 can determine the F-number, shutter speed, and ISO sensitivity from a predetermined program diagram based on the calculated EV value, and perform AE control.

[0063] It goes without saying that AF control and AE control are performed automatically when the auto mode is set by the operation unit 280, and that AF control and AE control are not performed when the manual mode is set.

[0064] In addition, in the video shooting mode, when the shutter release button 22 is fully pressed and an S2_ON signal is output, the camera body 200 enters a video recording mode in which video recording begins, and performs image processing and recording processing of the video. After that, when the shutter release button 22 is fully pressed again and an S2_ON signal is output, the camera body 200 enters a standby state and temporarily suspends the video recording processing.

[0065] [Shake Reduction Device] Next, the shake reduction device 100 will be described.

[0066] Figures 3, 4, 5, and 6 are diagrams showing image stabilization device 100 mounted on imaging device 10. Figure 3 is a front perspective view of image stabilization device 100, Figure 4 is a rear perspective view of image stabilization device 100, Figure 5 is a front perspective view of fixed section 102 of image stabilization device 100, and Figure 6 is a rear perspective view of movable section 101 of image stabilization device 100.

[0067] The image stabilization device 100 is mainly composed of a movable part 101 on which an image sensor 210 is mounted, a fixed part 102 fixed to the camera body 200, and a drive mechanism (in this example, three voice coil motors 113, 115, and 117) that moves (drives) the movable part 101 relative to the fixed part 102.

[0068] The holding member 104 constituting the movable part 101 holds the imaging element 210 and also holds three coils 113a, 115a, and 117a.

[0069] The movable part 101 abuts against the fixed part 102 via three balls 131. The movable part 101 is biased against the fixed part 102 by the attraction force of a magnet (not shown) or the elastic force of a spring, and the three balls 131 are sandwiched between the movable part 101 and the fixed part 102.

[0070] The movable section 101 can move (translate and rotate) within a plane (the XY plane in the drawing) perpendicular to the optical axis (Z axis). That is, the movable section 101 supports the holding member 104 so that the holding member 104 can move relative to the fixed section 102 within a plane parallel to the imaging surface of the imaging element 210.

[0071] The three voice coil motors 113, 115, and 117 are composed of three coils 113a, 115a, and 117a (see Figure 6), magnets 113b, 115b, and 117b (see Figure 5), and a first yoke 103 and a second yoke 105 that are common to the three voice coil motors 113, 115, and 117.

[0072] The portion of the second yoke 105 constituting the fixed portion 102 where the magnets 113b, 115b, and 117b are arranged functions as the second yoke 105. The first yoke 103 is disposed at a distance from the second yoke 105 via three shafts 121, 123, and 125.

[0073] The magnets 113b, 115b, and 117b are arranged in pairs with their magnetic poles facing in opposite directions. Three magnetic circuits corresponding to the three voice coil motors 113, 115, and 117 are formed by the respective pairs of magnets 113b, 115b, and 117b, the first yoke 103, and the second yoke 105.

[0074] On the other hand, the holding member 104 constituting the movable part 101 holds the imaging element 210 and also holds the three coils 113a, 115a, and 117a. The structure of the holding member 104 and the method of fixing the imaging element 210 and the coils 113a, 115a, and 117a to the holding member 104 will be described in detail later.

[0075] When the movable part 101 is arranged to be movable relative to the fixed part 102, the coils 113a, 115a, and 117a are arranged so as to cross three magnetic circuits each.

[0076] Therefore, the voice coil motor 113 moves the movable part 101 up and down (Y direction) depending on the direction and magnitude of the current flowing through the coil 113a, and the voice coil motors 115 and 117 move the movable part 101 left and right (X direction) depending on the direction and magnitude of the current flowing through the coils 115a and 117a. Also, by differentiating the direction and / or magnitude of the current flowing through the coil 115a of the voice coil motor 115 and the coil 117a of the voice coil motor 117, the movable part 101 can be rotated within the X-Y plane.

[0077] Additionally, three Hall elements corresponding to the three Hall sensors are disposed on the movable part 101. Two of the three Hall elements, Hall elements 157a and 157b, are disposed in the center of the coils 115a and 117a. The Hall elements 157a and 157b and the two magnetic circuits corresponding to the voice coil motors 115 and 117 respectively constitute two Hall sensors that detect the position of the movable part 101 in the X direction.

[0078] Meanwhile, a pair of magnets 119 that form a magnetic circuit for the remaining one of the three Hall sensors are disposed on the second yoke 105 of the fixed part 102 (FIG. 5). A Hall element (not shown) corresponding to the remaining one of the three Hall sensors is disposed on the movable part 101 at a position facing the pair of magnets 119, and this Hall sensor detects the position of the movable part 101 in the Y direction.

[0079] Based on the detected positions of these three Hall sensors, the position on the XY plane and the rotation angle of the movable part 101 can be detected.

[0080] Three ball receiving sections 107, 109, and 111 are formed in the holding member 104 of the movable section 101, and a ball 131 is received in each of the ball receiving sections 107, 109, and 111 (FIG. 6). Metal plates 107a, 109a, and 111a that serve as ball receiving surfaces are disposed on the bottom surfaces of the ball receiving sections 107, 109, and 111.

[0081] Each of the balls 131 housed in the ball housing portions 107, 109, and 111 can roll within the ball housing portions 107, 109, and 111. Therefore, the movable portion 101 can move freely on a plane perpendicular to the optical axis.

[0082] Furthermore, two regulating members (movable end regulating shafts) 133, 135 are implanted in the holding member 104 at approximately diagonal positions (FIG. 6), and these regulating members 133, 135 are loosely inserted into two regulating openings 141, 143 formed in the second yoke 105 of the fixed part 102. As a result, the regulating members 133, 135 abut against the regulating openings 141, 143 of the movable part 101 (holding member 104), mechanically restricting the movable range of the movable part 101.

[0083] <Holding Member> Next, the holding member that constitutes the movable portion will be described.

[0084] FIG. 7 is a rear view of the holding member that constitutes the movable portion, and FIG. 8 is a front view of the holding member that constitutes the movable portion.

[0085] The holding member 104 constituting the movable part 101 is a resin member molded from resin in order to reduce the weight and cost of the movable part 101 .

[0086] The holding member 104 is formed in a frame shape and has a first opening 104a in which the imaging element 210 is arranged, and second openings 104c, 104d, and 104e outside the first opening 104a in which the coils 113a, 115a, and 117a are arranged, respectively.

[0087] The holding member 104 that holds the image sensor 210 is preferably made of a highly thermally conductive resin, in order to prevent the temperature of the image sensor 210 from rising.

[0088] FIG. 9 is a graph showing an example of the temperature rise with respect to the raw materials of the holding member and the use time of the imaging element (CMOS).

[0089] The temperature judgment value of the image pickup device was set to 77°C, and the time until the temperature reached 77°C was measured.

[0090] In the case of a holding member made from a general resin with a thermal conductivity λ of 0.2 (W / m / K), the temperature reached the temperature judgment value of 77°C 18 minutes after the start of use.

[0091] In addition, in the case of a holding member made of magnesium alloy die-cast (AZ91D) with a thermal conductivity λ of 60 (W / m / K), the temperature reached the temperature judgment value of 77° C. 30 minutes after the start of use.

[0092] On the other hand, in the case of a holding member made from a highly thermally conductive resin with a thermal conductivity λ of 3 (W / m / K), the temperature reached the temperature judgment value of 77° C. 22 minutes after the start of use.

[0093] Therefore, the resin used to mold the holding member 104 is a highly thermally conductive resin with a thermal conductivity of 2 (W / m / K) or more, and preferably a highly thermally conductive resin with a thermal conductivity of 3 (W / m / K) or more.

[0094] Furthermore, a resin containing carbon fiber can be used as the highly thermally conductive resin.

[0095] 7, reference numeral 170 denotes a gate position into which resin flows when the holding member 104 is injection molded. The resin that flows in from the gate position 170 branches to the left and right in FIG.

[0096] The carbon fibers contained in the resin are oriented in a direction parallel to the flow direction of the resin (the direction indicated by arrow 174), and the thermal conductivity is highest in the direction of the carbon fibers (i.e., the direction of arrow 174 along the frame shape).

[0097] Therefore, in the case of a holding member 104 made from a highly thermally conductive resin containing carbon fiber, it is preferable that the carbon fibers contained in the holding member 104 be oriented in a direction that follows the frame shape of the holding member 104. This makes it possible for the heat generated by the image sensor 210 to be transferred to the holding member 104, which is molded from a highly thermally conductive resin, and to be efficiently diffused along the frame shape of the holding member 104.

[0098] The resin containing the highly thermally conductive filler is not limited to a resin containing carbon fiber, but may also contain a metal-based or metal oxide-based fibrous filler.

[0099] Furthermore, the holding member 104 that holds the coils 113 a, 115 a, and 117 a is preferably made of conductive resin. When the movable part 101 is driven, a large current flows through the coils 113 a, 115 a, and 117 a, which generates electromagnetic waves near the coils 113 a, 115 a, and 117 a, and the coils 113 a, 115 a, and 117 a become noise sources for the image sensor 210.

[0100] By arranging the coils 113a, 115a, and 117a in the second openings 104c, 104d, and 104e of the holding member 104 made of conductive resin, the outer peripheries of the coils 113a, 115a, and 117a (particularly on the imaging element 210 side) can be surrounded by conductive resin, thereby obtaining the effect of reducing the influence of noise on the imaging element 210.

[0101] The highly thermally conductive resin containing carbon fiber is also a conductive resin, and is therefore suitable as a raw material for the holding member 104 .

[0102] <Method of Fixing Image Pickup Element> Next, a method of fixing the image pickup element 210 to the holding member 104 will be described.

[0103] 7 and 8, two positioning holes 104g and 104h are formed in the holding member 104. The positioning hole 104g is circular, and the positioning hole 104h is an elongated hole.

[0104] First, the holding member 104 is positioned on the jig by inserting two positioning pins of the jig (not shown) into the two positioning holes 104g and 104h of the holding member 104, respectively.

[0105] Next, the imaging element 210 is held and the position and attitude of the imaging element 210 is adjusted using a device capable of adjusting the three-dimensional position and attitude of the imaging element 210 so that the imaging element 210 is in a pre-designed reference position and attitude relative to the holding member 104 positioned on the jig.

[0106] When the image pickup element 210 is positioned relative to the holding member 104 as described above, a gap is left between the holding member 104 and the image pickup element 210 .

[0107] 10 and 11 are rear views of the holding member to which the imaging element is adhesively fixed.

[0108] The imaging element 210 is fixed to the holding member 104 using adhesive (first adhesives 150a, 150b, 150c and second adhesives 152a, 152b), but before the adhesive is applied (spread, filled), there is a gap between the holding member 104 and the imaging element 210.

[0109] 11 indicates the four sides of the outline of the imaging element 210. In Fig. 11, there is a gap between the side surfaces of the imaging element 210 corresponding to the three sides of the outline of the imaging element 210, namely the top, bottom, and right sides, and the inner circumferential surface of the first opening 104a of the holding member 104 in which the imaging element 210 is disposed, and there is also a gap between the left frame of the holding member 104 and the substrate 211 of the imaging element 210 that faces the left frame.

[0110] After positioning the imaging element 210 relative to the holding member 104, the first adhesives 150a, 150b, 150c and second adhesives 152a, 152b for fixing are filled into the gap and allowed to solidify, thereby fixing the imaging element 210 to the holding member 104.

[0111] Before positioning the imaging element 210, the first adhesive 150c and the second adhesive 152b may be applied to the left frame of the holding member 104 (the back side of the left frame in Figure 10), and when the imaging element 210 is positioned, the first adhesive 150c and the second adhesive 152b may be filled into the gap between the left frame and the substrate 211 of the imaging element 210 facing the left frame.

[0112] Of the first adhesives 150a, 150b, and 150c and the second adhesives 152a and 152b for fixing, the first adhesives 150a, 150b, and 150c have a higher hardness than the second adhesives 152a and 152b. Conversely, the second adhesives 152a and 152b have a lower hardness than the first adhesives 150a, 150b, and 150c.

[0113] The first adhesives 150a, 150b, and 150c for fixing, which have at least high hardness, refer to those used to determine the relative position between the holding member 104 and the imaging element 210, and do not include elastic adhesives that are intended to improve thermal conduction.

[0114] In this example, the first adhesives 150a, 150b, and 150c are ultraviolet-curable adhesives, which can be applied and then cured in a short time by irradiating with ultraviolet light, and the solidification of the first adhesives 150a, 150b, and 150c leaves the relative positions of the holding member 104 and the image sensor 210 unchanged.

[0115] Furthermore, it is preferable that the first adhesives 150a, 150b, and 150c are not applied to gaps close to the restricting members 133 and 135, but are applied between the image sensor 210 and the holding member 104, which are spaced apart by the first distance or more from the restricting members 133 and 135. For example, the first adhesive is not applied to gaps within a circle 145 close to the restricting members 133 and 135 shown in FIG.

[0116] In this example, the first adhesives 150a and 150b are filled in the gap between the holding member 104 and the side surfaces of the imaging element 210 that correspond to the upper and lower edges of the outer shape of the imaging element 210, respectively, and are sufficiently spaced apart from the restricting members 133 and 135. The first adhesive 150c is also sufficiently spaced apart from the restricting member 133.

[0117] The reason why the first adhesives 150a, 150b, and 150c are applied between the image pickup element 210 and the holding member 104, which are spaced apart from the regulating members 133 and 135 by the first distance or more, is as follows.

[0118] The movable range of the movable part 101 is mechanically restricted by the restricting members 133, 135 and the restricting openings 141, 143, so when an impact is applied to the imaging device 10 due to being dropped or the like, the restricting members 133, 135 collide with the restricting openings 141, 143, and a force that tends to deform the holding member 104 is applied near the restricting members 133, 135.

[0119] If the holding member 104 is made of a strong metal material, deformation can be minimized, but if it is made of resin, a large instantaneous displacement occurs. This instantaneous deformation acts as a force that pulls the adhesive material apart, and if the force exceeds the holding strength of the adhesive material, peeling occurs at the interface.

[0120] If peeling occurs at the adhesive interface, the peeling spreads in a direction away from the holding member 104, causing a large deviation in the relative positions of the image sensor 210 and the holding member 104.

[0121] On the other hand, in areas other than the vicinity of the restricting members 133 and 135 (at least the first distance), the impact is small and the adhesive does not peel off, so the restricting members 133 and 135 can be firmly fixed.

[0122] In this example, first adhesives 150a, 150b, and 150c and second adhesives 152a and 152b are applied, and the second adhesives 152a and 152b are applied to locations different from the locations to which the first adhesives 150a, 150b, and 150c are applied, and are also applied to gaps within a circle 145 close to the restricting members 133 and 135, as shown in Fig. 11. The locations to which the second adhesives 152a and 152b are applied include locations excluding shapes that increase the adhesive area of ​​the first adhesives 150a and 150b.

[0123] When the restricting members 133, 135 collide with the restricting openings 141, 143 and the holding member 104 is slightly deformed, the second adhesives 152a, 152b are also slightly deformed. The second adhesives 152a, 152b preferably have a hardness (elasticity) that prevents peeling at the interface with such slight deformation. Note that the second adhesives 152a, 152b do not necessarily need to be applied.

[0124] Since the adhesive strength is greater when the adhesive area with the component is larger, the holding member 104 has a shape that increases the adhesive area of ​​the first adhesives 150 a, 150 b. The holding member 104 of this example has a plurality of uneven shapes 104 b, as shown in Figures 6 and 7, which increase the adhesive area.

[0125] As described above, the holding member 104 is formed in a frame shape, and the uneven shape 104b is formed on at least two sides of the frame shape. In this example, the uneven shape 104b is formed on the top and bottom sides of the first opening 104a of the holding member 104 in which the image sensor 210 is disposed, as shown in Figure 7.

[0126] 12 is a perspective view showing a part of the holding member shown in FIG. 10. FIG.

[0127] As shown in FIGS. 6, 7 and 12, a plurality of concave and convex shapes 104b are formed on the inner peripheral surface of the first opening 104a of the holding member 104, in which the imaging element 210 is disposed.

[0128] In addition, the adhesive strength may be further strengthened by providing fine irregularities such as embossing to the portion of the holding member 104 where the irregular shape 104b is formed, instead of or in addition to the irregular shape 104b.

[0129] <Method of Fixing Coils> Next, a method of fixing the coils 113a, 115a, and 117a to the holding member 104 will be described.

[0130] The coils 113 a , 115 a , and 117 a can be fixed to the holding member 104 in the same manner as the imaging element 210 is fixed to the holding member 104 .

[0131] That is, after the holding member 104 is positioned on the jig, the coil 113a is held, and the position and posture of the coil 113a are adjusted using a device capable of adjusting the three-dimensional position and posture of the coil 113a so that the coil 113a is in a pre-designed reference position and posture relative to the holding member 104 positioned on the jig.

[0132] When the coil 113a is positioned relative to the holding member 104, a gap is formed between the inner circumferential surface of the second opening 104c of the holding member 104 and the coil 113a.

[0133] As shown in FIG. 6, a first adhesive 154a is filled into the gap between the inner circumferential surface of the second opening 104c of the holding member 104 and the coil 113a, and the first adhesive 154a is allowed to harden, thereby fixing the coil 113a to the holding member 104.

[0134] Similarly, the positions and postures of the other coils 115a and 117a are adjusted relative to the holding member 104 positioned on the jig so that the coils 115a and 117a are in the pre-designed reference position and posture, and first adhesives 154b and 154c are filled into the gaps between the inner surfaces of the second openings 104d and 104e of the holding member 104 and the coils 113a and 117a, respectively, and allowed to solidify, thereby fixing the coils 115a and 117a to the holding member 104.

[0135] The first adhesives 154a, 154b, and 154c are ultraviolet curable adhesives, and therefore can be hardened in a short time by irradiating them with ultraviolet light after filling.

[0136] <Another embodiment of the movable portion> FIG. 13 is a schematic diagram showing another embodiment of the movable portion.

[0137] 13 has second openings 104-1a, 104-1b, and 104-1c to which three coils 156a, 156b, and 156c are respectively fixed. These second openings 104-1a, 104-1b, and 104-1c have a first opening shape with the inner periphery of the opening closed.

[0138] The holding member 104 shown in FIG. 7 has second openings 104c, 104d, and 104e to which the three coils 113a, 115a, and 117a are respectively fixed. However, these second openings 104c, 104d, and 104e have second opening shapes in which a portion of the inner periphery of each opening is open, and therefore the shapes of these second openings 104c, 104d, and 104e differ from those of the holding member 104-1.

[0139] Because the second openings 104-1a, 104-1b, and 104-1c of the holding member 104-1 have a first opening shape in which the inner peripheries of the openings are closed, the holding member 104-1 can surround the entire periphery of the coils 156a, 156b, and 156c. As a result, if the holding member 104-1 is molded from a conductive resin, the influence of electromagnetic waves generated near the coils 156a, 156b, and 156c on the imaging element 210 can be reduced more than with the holding member 104 shown in Fig. 7. On the other hand, because the holding member 104 shown in Fig. 7 has a second opening shape in which part of the inner periphery of the second openings 104c, 104d, and 104e is open (missing), the holding member 104 can be made more compact than the holding member 104-1.

[0140] <Shape of Screw Holes Formed in Holding Member> Next, the shape of the screw holes formed in the holding member 104 will be described.

[0141] As shown in FIG. 8, the holding member 104 is formed with three screw holes 104f.

[0142] As shown in FIG. 3, three male screws 213, 214, and 215 are fastened to these three screw holes 104f via a metal member 212 that covers the outer periphery of the front side of the image pickup element 210.

[0143] FIG. 14 is a cross-sectional view of a main part of the holding member, including a cross section of a screw hole formed in the holding member.

[0144] 14, the holding member 104 is molded from a resin material, and therefore the screw holes 104f are not pre-threaded. The male screws 213 are turned into the screw holes 104f to form threads (self-tapping).

[0145] Resins containing carbon fibers have the problem of generating more dust when screwed in than other resin materials.

[0146] The screw holes 104f formed in the holding member 104 in this example are not through holes, but are blind holes that are deeper than the length (screw depth) of the male screws 213. As a result, dust generated by screwing is collected in the space 104j between the tip of the male screws 213 and the bottom of the screw holes 104f, and is not dispersed to the outside, which makes it possible to prevent dust from adhering to the image sensor 210 or the interchangeable lens 12.

[0147] 15A and 15B are diagrams showing a configuration for fastening a flexible printed circuit (FPC) connected to the rear side of the imaging element to a holding member. Fig. 15A is a perspective view of the essential parts showing a state in which the FPC 160 is fastened to the holding member 104 by a male screw 216, and Fig. 15B is a cross-sectional view of the essential parts of the holding member 104 including cross sections of the male screw 216 and the screw hole 104m.

[0148] 15(B), the screw hole 104m is a blind hole that is deeper than the depth to which the male screw 216 is screwed in. As a result, as in the case shown in FIG. 14, dust generated by screwing is collected in the space 104n between the tip of the male screw 216 and the bottom of the screw hole 104m, and is not dispersed to the outside.

[0149] Furthermore, since carbon fiber resin formed in a mold does not have electrical conductivity on the molded surface, it is not possible to make it electrically conductive by attaching conductive cloth or the like.

[0150] 15B, by screwing the male screw 216 into the screw hole 104m and fastening it while self-tapping, the insulating layer on the surface of the screw hole 104m is destroyed, and electrical continuity is established between the male screw 216 and the screw hole 104m. In addition, the head of the male screw 216 is structured to press against the conductive land 162 of the FPC 160, and electrical continuity is established between the male screw 216 and the conductive land 162.

[0151] That is, the conductive lands 162 of the FPC 160 and the holding member 104 can be electrically connected via the male threads 216 .

[0152] [Others] The image stabilization device according to the present invention is not limited to applications in mirrorless digital single-lens cameras, but can also be applied to various cameras such as digital single-lens reflex cameras, compact cameras with integrated lenses, and cameras built into smartphones and the like.

[0153] Furthermore, the holding member is not limited to the shape shown in FIG. 7 or 13, but various shapes are possible, and the configuration of the voice coil motor is not limited to that of this embodiment.

[0154] Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

[0155] 10...imaging device 12...interchangeable lens 22...shutter release button 23...shutter speed dial 24...exposure compensation dial 25...power lever 100...image stabilizer 101, 101-1...moving part 102...fixed part 103...first yoke 104, 104-1...holding member 104a...first opening 104b...concave and convex shape 104c, 104d, 104e, 104-1a, 104-1b, 104-1c...second opening 104f, 104m...screw hole 104g, 104h...positioning hole 104j, 104n...space 105...second yoke 107, 109, 111...ball accommodating part 107a, 109a, 111a...metal plate 113, 115, 117...voice coil motor 113a, 115a, 117a, 156a, 156b, 156c... Coils 113b, 115b, 117b, 119... Magnets 121, 123, 125... Shafts 131... Balls 133, 135... Restricting members 141, 143... Restricting openings 145... Circles 150a, 150b, 150c, 154a, 154b, 154c... First adhesive 152a, 152b... Second adhesive 157a, 157b... Hall elements 160... FPC 162... Conductive lands 170... Gate positions 172, 174... Arrows 200... Camera body 210... Image pickup element 210a... Frame line 211... Substrate 212... Metal member 213, 214, 215, 216... Male screws 230... Shake control unit 240... Processor 250... Display driver 260... Memory 262... Body mount 270... Shake detection sensor 280... Operation unit 290... LCD

Claims

1. In a blur correction device that performs blur correction by driving an image sensor by a driving mechanism, a fixed portion including a magnet and a yoke that constitute the driving mechanism; a movable section having a holding member that holds a coil constituting the driving mechanism and the imaging element, and movably supporting the holding member, The imaging element and the holding member are bonded with a first adhesive and a second adhesive different from the first adhesive, and the second adhesive is applied to a location different from a location where the first adhesive is applied. Image stabilization device.

2. The driving mechanism is a voice coil motor. The image stabilization device according to claim 1 .

3. the movable portion supports the holding member movably relative to the fixed portion within a plane parallel to an imaging surface of the imaging element; The image stabilization device according to claim 1 .

4. The holding member is a resin member molded from a highly thermally conductive resin. The image stabilization device according to claim 1 .

5. The thermal conductivity of the highly thermally conductive resin is 2 (W / m / K) or more. The image stabilization device according to claim 4.

6. The thermal conductivity of the highly thermally conductive resin is preferably 3 (W / m / K) or more. The image stabilization device according to claim 4.

7. The highly thermally conductive resin is a resin containing a fibrous filler. The image stabilization device according to claim 4.

8. The holding member is formed in a frame shape, The direction of the fibrous filler in the holding member is oriented in a direction along the frame shape. The image stabilization device according to claim 7.

9. The holding member is a resin member molded from a conductive resin. The image stabilization device according to claim 1 .

10. The holding member is a resin member molded from a conductive resin. The image stabilization device according to claim 4.

11. The holding member has a shape that increases an adhesion area of ​​the first adhesive. The image stabilization device according to claim 1 .

12. The first adhesive is applied to the shape. The image stabilization device according to claim 11.

13. The shape is an uneven shape. The image stabilization device according to claim 11.

14. The holding member has a plurality of the uneven shapes. The image stabilization device according to claim 13.

15. The holding member is formed in a frame shape and has a plurality of the concave and convex shapes on at least two sides of the frame shape. The image stabilization device according to claim 14.

16. The first adhesive is an ultraviolet curing adhesive. The image stabilization device according to claim 1 .

17. The second adhesive is composed of an adhesive having a lower hardness than the first adhesive. The image stabilization device according to claim 1 .

18. the holding member includes a restricting member that restricts a movable range of the movable portion by contacting the fixed portion, the first adhesive is applied between the imaging element and the holding member, the imaging element being spaced a first distance or more from the restricting member; The image stabilization device according to claim 17.

19. the holding member has a shape that increases an adhesion area of ​​the first adhesive, The shape for increasing the adhesion area of ​​the first adhesive is spaced from the regulating member by at least the first distance. The image stabilization device according to claim 18.

20. the holding member has a shape that increases an adhesion area of ​​the first adhesive, The different portion is a portion other than a shape that increases an adhesion area of ​​the first adhesive. The image stabilization device according to claim 18.

21. The screw hole formed in the holding member is a non-through hole that is deeper than the length of the male screw. The image stabilization device according to claim 4 .

22. the holding member has a second opening in which the coil is disposed, the second opening being located outside a first opening in which the imaging element is disposed; The first adhesive is filled between the coil and an inner circumferential surface of the second opening. The image stabilization device according to claim 1 .

23. The second opening has a first opening shape in which the periphery of the second opening is closed, or a second opening shape in which a part of the periphery of the second opening is open. The image stabilization device according to claim 22.