JP2008216570A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus equipped with a shake correction mechanism having resistance to electric noise with compact and simple constitution. <P>SOLUTION: An X-axis gyro 350x and a Y-axis gyro 350y are arranged near an X-axis vibrator 320x and a Y-axis vibrator 320y and on the side of a left lower angle part at which a base and a left-hand side of an imaging range 400 along which the X-axis vibrator 320x and the Y-axis vibrator 320y are arranged cross each other, and electrically connected to a drive substrate 402 through a flexible printed board 410, whereby the wiring length of the flexible printed board 410 to the drive substrate 402 is made the shortest. Thus, influence of the electric noise on the X-axis gyro 350x and the Y-axis gyro 350y is restrained to the minimum with the compact and simple constitution. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image pickup apparatus such as a digital camera that moves a photographic optical system or an image pickup element in accordance with a signal from a shake detection unit and performs shake correction.

  2. Description of the Related Art Conventionally, for example, there is a camera as an imaging apparatus having a blur correction function. As a camera shake correction function provided in the camera, a camera shake vibration in the camera pitch direction and camera shake vibration in the camera yaw direction are detected using a shake detection means such as an angular velocity sensor, and the shake is canceled in a direction based on the detected shake signal. Camera shake correction that corrects image blur on the imaging surface of the imaging device by shifting a part of the imaging optical system or the imaging device independently in the horizontal and vertical directions in a plane perpendicular to the imaging optical axis. The function is known.

  In a camera shake correction mechanism that realizes such a camera shake correction function, a camera shake detector must be provided in the imaging device in order to detect camera shake. Further, driving means for moving the image sensor itself in the horizontal direction and the vertical direction within a plane orthogonal to the photographing optical axis is used. These shake detectors and driving means are electrically connected to the same circuit board that performs camera shake correction control. The electric signal detected by the shake detector is weak, and is extremely susceptible to noise generated by other circuits, and noise resistance is required. On the other hand, the driving means is likely to generate electric noise and is supplied with a large amount of electric power, so that an electric shield and a large electric power supply are required. At the same time, the blur detector needs to detect only the blurring of the image by interrupting the vibration generated from the driving mechanism or other mechanisms such as a shutter or a mirror during imaging.

  In response to such a request, in Patent Document 1, a vibration gyro, which is a shake detector, attached to a printed circuit board having an electric shield layer is attached to a reinforcing plate, and the front of a film cartridge chamber of a camera (film camera). It is fixed to the side via a rubber bush. In Patent Document 2, a shake detection sensor mounted on a sensor substrate is held in a sensor case from three directions via an elastic sheet.

Japanese Patent Laid-Open No. 2002-311487 JP-A-7-270847

  However, in the shake detector shown in Patent Document 1, when the image pickup device is driven to correct the shake, there is a drive mechanism around the image pickup device, and the shake correction control circuit is provided with either the drive mechanism or the shake detector. When placed close to each other, it is necessary to provide a long wiring with respect to the other, and the structure becomes complicated for wiring to the main body. For example, when the wiring of the blur detector is lengthened, it is necessary to shield the external noise from getting on the wiring. Further, when the wiring of the driving mechanism is lengthened, it is necessary to shield the wiring in order to prevent noise generated by the driving mechanism. In any case, it is difficult to extend the shield over a long distance, which increases the size and weight. In particular, the electrical connection to the shake correction control circuit is made via a flexible printed circuit board, but it is difficult to shield the wiring on the flexible printed circuit board. Furthermore, it is necessary to write the intrinsic value of the shake detector to the shake correction control circuit, and this writing operation must be performed in a state close to the finished product in terms of camera assembly, but the shake detector is separated from the shake correction control circuit. In the case of being arranged at a different location, the degree of freedom in the assembly process is reduced.

  On the other hand, with respect to vibration isolation of the shake detector having such a structure, since the elastic sheet is not directly disposed on the shake detector portion, the reinforcing plate itself resonates, and it is difficult to block vibration. Therefore, Patent Document 2 shows that the shake detector is sandwiched between elastic sheets from three directions, but no consideration is given to vibration suppression on the sensor substrate side.

  The present invention has been made in view of the above, and an object of the present invention is to provide an imaging apparatus including a shake correction mechanism that is resistant to electrical noise and noise caused by mechanical vibration generated around the imaging apparatus with a small and simple configuration. And

  In order to solve the above-described problems and achieve the object, an imaging apparatus according to the present invention includes a first direction orthogonal to the imaging optical axis, and a second direction orthogonal to the imaging optical axis and the first direction. An image pickup apparatus including a camera shake correction device that displaces an image pickup device in a direction holds a fixed member, a first moving body that can move relative to the fixed member in the first direction, and the image pickup device. A second movable body that is movable relative to the first movable body in the second direction, a first drive source for driving the first movable body, and the second A second drive source for driving the movable body, and a shake detection means for detecting a shake, wherein the shake detection means includes the first drive source and the second drive source. It is arranged in the vicinity.

  In the image pickup apparatus according to the present invention, in the above invention, the image pickup apparatus includes a drive board attached to the fixing member and having a drive circuit for driving the first and second drive sources, And electrically connected to the driving substrate.

  In the imaging device according to the present invention, in the above invention, the imaging element has a substantially rectangular imaging range, and the first and second drive sources are along the sides of the imaging range that intersect each other. The blur detecting means is arranged on a corner portion side where the sides arranged so that the first and second driving sources are along each other.

  In the image pickup apparatus according to the present invention, in the above invention, the drive substrate includes the first and second drive sources arranged on a plane parallel to the image pickup surface of the image pickup element with the shooting optical axis as a center. It is arranged close to the side.

  The image pickup apparatus according to the present invention is the image pickup apparatus according to the above invention, wherein the blur detecting unit is located at a position outside the projection range in the direction of the photographing optical axis of the imaging substrate for the image pickup element arranged around the photographing optical axis. It is electrically connected to the driving substrate.

  In the image pickup apparatus according to the present invention as set forth in the invention described above, the blur detection unit is attached to the fixing member via a vibration isolating member.

  Moreover, in the imaging device according to the present invention, in the above invention, the blur detection unit is an angular velocity sensor or an acceleration sensor mounted on a flexible printed circuit board, and the flexible printed circuit board is fixed to the first holding member, The first holding member is held by a second holding member via the vibration isolating member, and the second holding member is fixed to the fixing member.

  Moreover, the imaging device according to the present invention is characterized in that, in the above-described invention, the imaging device includes a second vibration isolating member that is disposed on a surface side of the angular velocity sensor or the acceleration sensor and is sandwiched by being pressed by a pressing plate.

  The image pickup apparatus according to the present invention is characterized in that, in the above invention, the blur detecting means is attached to a main body of the image pickup apparatus via a vibration isolating member.

  Moreover, in the imaging device according to the present invention, in the above invention, the blur detection unit is an angular velocity sensor or an acceleration sensor mounted on a flexible printed circuit board, and the flexible printed circuit board is fixed to the first holding member, The first holding member is held by a second holding member via the vibration isolation member, and the second holding member is fixed to the main body.

  Moreover, the imaging device according to the present invention is characterized in that, in the above-described invention, the imaging device includes a second vibration isolating member that is disposed on a surface side of the angular velocity sensor or the acceleration sensor and is sandwiched by being pressed by a pressing plate.

  In the imaging device according to the present invention, in the above invention, the second holding member is fixed to the main body in a state where the third vibration-proof member is pressed and contacted by the exterior member of the imaging device. It is characterized by.

  According to the image pickup apparatus of the present invention, by arranging the shake detection means in the vicinity of the first drive source and the second drive source, the wiring length for the drive board having the drive circuit for shake control is minimized. Thus, it is possible to reduce the influence of electrical noise received by the shake detection means to a minimum with a small and simple configuration.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a best mode for carrying out a driving device and an imaging device according to the invention will be described with reference to the drawings. The imaging apparatus according to the present embodiment is equipped with a driving device for performing camera shake correction of an imaging unit including an imaging element that obtains an image signal by photoelectric conversion. An application example to a flex-type electronic camera (digital camera) will be described.

  First, a system configuration example of the camera according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram schematically showing mainly an electrical system configuration of the camera of the present embodiment. The camera according to the present embodiment is configured by a system including a body unit 100 as a camera body and a lens unit 10 as an interchangeable lens that is one of accessory devices.

  The lens unit 10 is detachable through a lens mount (not shown) provided on the front surface of the body unit 100. The lens unit 10 is controlled by its own lens control microcomputer (hereinafter referred to as “Lucom”) 5. The body unit 100 is controlled by a body control microcomputer (hereinafter referred to as “Bucom”) 50. These Lucom 5 and Bucom 50 are electrically connected via the communication connector 6 in a state where the lens unit 10 is mounted on the body unit 100. As a camera system, the Lucom 5 is configured to operate in cooperation with the Bucom 50 in a dependent manner.

  The lens unit 10 includes a photographing lens 1 and a diaphragm 3. The taking lens 1 is driven by a DC motor (not shown) provided in the lens driving mechanism 2. The diaphragm 3 is driven by a stepping motor (not shown) provided in the diaphragm driving mechanism 4. Lucom 5 controls each of these motors based on a command from Bucom 50.

  In the body unit 100, the following components are arranged as shown in the figure. For example, a single-lens reflex component (penta prism 12, quick return mirror 11, eyepiece lens 13, submirror 11a) as an optical system, a focal plane shutter 15 on the photographing optical axis, and a reflected light beam from the submirror 11a In response, an AF sensor unit 16 for detecting the defocus amount is provided.

  Also, an AF sensor driving circuit 17 for driving and controlling the AF sensor unit 16, a mirror driving circuit 18 for driving and controlling the quick return mirror 11, and a shutter charging mechanism 19 for charging a spring for driving the front curtain and the rear curtain of the shutter 15. A shutter control circuit 20 that controls the movement of the front and rear curtains, and a photometric circuit 21 that performs photometric processing based on a photometric sensor 21a that detects the light flux from the pentaprism 12 are provided.

  An imaging unit 30 for photoelectrically converting a subject image that has passed through the optical system is provided on the photographing optical axis. The image pickup unit 30 is formed by integrating a CCD 31 that is an image pickup element, an optical low-pass filter (LPF) 32 and a dustproof filter 33 disposed on the front surface thereof as a unit. A piezoelectric element 34 is attached to the periphery of the dust filter 33. The piezoelectric element 34 has two electrodes, and the dust-proof filter 33 is vibrated by vibrating the piezoelectric element 34 at a predetermined frequency by the dust-proof filter control circuit 48 to remove dust attached to the filter surface. Configured to get. An anti-vibration unit for camera shake correction, which will be described later, is added to the imaging unit 30.

  The camera system of the present embodiment also includes a CCD interface circuit 23 connected to the CCD 31, a liquid crystal monitor 24, an SDRAM 25 that functions as a storage area, a flash ROM 26, and an image processing controller 28 that performs image processing. The electronic recording display function can be provided together with the electronic imaging function. Here, the recording medium 27 is an external recording medium such as various memory cards or an external HDD, and is mounted so as to be communicable with the camera body via a communication connector and exchangeable. Then, image data obtained by photographing is recorded on the recording medium 27. As the other storage area, a non-volatile memory 29 made of, for example, an EEPROM for storing predetermined control parameters necessary for camera control is provided so as to be accessible from the Bucom 50.

  The Bucom 50 is provided with an operation display LCD 51 and an operation display LED 51a for notifying the user of the operation state of the camera by display output, and a camera operation SW52. The camera operation SW 52 is a switch group including operation buttons necessary for operating the camera, such as a release SW, a mode change SW, and a power SW. Furthermore, a battery 54 as a power source and a power circuit 53 that converts and supplies the voltage of the battery 54 to a voltage required by each circuit unit constituting the camera system are provided, and current is supplied from an external power source via a jack. A voltage detection circuit for detecting a voltage change when supplied is also provided.

  Each part of the camera system configured as described above generally operates as follows. First, the image processing controller 28 takes in image data from the CCD 31 by controlling the CCD interface circuit 23 in accordance with an instruction from the Bucom 50. This image data is converted into a video signal by the image processing controller 28 and output and displayed on the liquid crystal monitor 24. The user can confirm the captured image from the display image on the liquid crystal monitor 24.

  The SDRAM 25 is a memory for temporarily storing image data, and is used as a work area when image data is converted. The image data is stored in the recording medium 27 after being converted into JPEG data.

  The mirror drive mechanism 18 is a mechanism for driving the quick return mirror 11 to the up position and the down position. When the quick return mirror 11 is in the down position, the light flux from the photographing lens 1 is on the AF sensor unit 16 side. The light is divided and guided to the pentaprism 12 side. The output from the AF sensor in the AF sensor unit 16 is transmitted to the Bucom 50 via the AF sensor driving circuit 17 and a known distance measurement process is performed. On the other hand, a part of the light beam that has passed through the pentaprism 12 is guided to a photometric sensor 21a in the photometric circuit 21, and a known photometric process is performed based on the amount of light detected here.

  Next, the imaging unit 30 including the CCD 31 will be described with reference to FIG. FIG. 2 is a longitudinal side view illustrating a configuration example of the imaging unit 30. The imaging unit 30 is disposed on the side of the photoelectric conversion surface of the CCD 31 and a CCD 31 as an imaging device that obtains an image signal corresponding to the light that is transmitted through the imaging optical system and irradiated on its own photoelectric conversion surface. An optical low-pass filter (LPF) 32 that removes a high-frequency component from a subject light beam that is transmitted through the filter, a dust-proof filter 33 that is opposed to the optical LPF 32 at a predetermined interval on the front side, and a periphery of the dust-proof filter 33 And a piezoelectric element 34 which is disposed in the part and applies predetermined vibration to the dustproof filter 33.

  Here, the CCD chip 31a of the CCD 31 is directly mounted on the flexible substrate 31b disposed on the fixed plate 35, and the connection portions 31c and 31d extending from both ends of the flexible substrate 31b are connected to the main circuit substrate (imaging substrate) 36. It is connected to the main circuit board 36 side through the provided connectors 36a and 36b. The protective glass 31e of the CCD 31 is fixed on the flexible substrate 31b via a spacer 31f.

  A filter receiving member 37 made of an elastic member or the like is disposed between the CCD 31 and the optical LPF 32. The filter receiving member 37 is disposed at a position that avoids the effective range of the photoelectric conversion surface at the peripheral edge of the front surface of the CCD 31, and is in contact with the vicinity of the peripheral edge of the optical LPF 32 so that the CCD 31 and the optical LPF 32 It is comprised so that substantially airtightness may be maintained between. A holder 38 that covers the CCD 31 and the optical LPF 32 in an airtight manner is disposed. The holder 38 has a rectangular opening 38a at a substantially central portion around the photographing optical axis, and a step portion 38b having a substantially L-shaped cross section is formed on the inner peripheral edge of the opening 38a on the dustproof filter 33 side. The optical LPF 32 and the CCD 31 are disposed from the rear side of the opening 38a. Here, the optical LPF 32 is positioned so that the front side peripheral edge of the optical LPF 32 is in substantially airtight contact with the stepped portion 38b, whereby the position of the optical LPF 32 in the photographing optical axis direction is regulated by the stepped portion 38b. The front side is secured from the inside.

  On the other hand, a dust-proof filter receiving portion that protrudes to the front side of the step portion 38b around the step portion 38b in order to hold the dust-proof filter 33 on the front surface of the optical LPF 32 at a predetermined interval at the peripheral portion on the front side of the holder 38. 38c is formed over the entire circumference. The dustproof filter 33 formed in a circular or polygonal plate shape as a whole is formed of an elastic body such as a leaf spring and is pressed by a pressing member 40 fixed to the dustproof filter receiving portion 38c with a screw 39. It is supported by the part 38c. Here, an annular seal 41 is interposed between the piezoelectric element 34 portion disposed on the outer peripheral edge portion on the back side of the dustproof filter 33 and the dustproof filter receiving portion 38c, thereby ensuring an airtight state. The imaging unit 30 is configured in an airtight structure including the holder 38 formed in a desired size for mounting the CCD 31 in this way.

  Next, the camera shake correction function of the camera according to the present embodiment will be described. In the present embodiment, when the direction of the photographing optical axis is the Z-axis direction, the X-axis direction that is the first direction orthogonal to the XY plane orthogonal to the photographing optical axis and the Y-axis direction that is the second direction. The image pickup device CCD 31 is displaced and moved so as to compensate for blurring. The image stabilization unit including a camera shake correction drive device is subjected to elliptical vibration in the drive unit when a predetermined frequency voltage is applied. The holder 38 on which the CCD 31 in the imaging unit 30 is mounted is configured as a moving object.

  First, an operation principle of a vibrator used as a drive source in the drive device of the present embodiment will be described. FIG. 3 is a schematic diagram showing the operation principle of the vibrator. The vibrator 200 includes a piezoelectric body 201 formed in a rectangular shape with a predetermined size, a pair of drive electrodes 202 and 203 formed so as to be symmetrical with respect to one side of the piezoelectric body 201, and the drive electrode 202. , 203 and drive elements 204, 205 as drive units provided at the surface position of the piezoelectric body 201. When a + voltage is applied to the drive electrode 202, as shown in FIG. 3A, the drive electrode 202 portion is deformed to be extended, while the back surface side piezoelectric body 201 portion is not deformed to be extended. Deforms into an arc. Conversely, when a negative voltage is applied to the drive electrode 202, as shown in FIG. 3C, the drive electrode 202 part is deformed so as to shrink, while the back side piezoelectric body 201 part is not shrunk. It is deformed into an arcuate shape opposite to that in FIG. The same applies to the drive electrode 203 side.

  Therefore, in order to generate elliptical vibrations on the surfaces of the driver elements 204 and 205, a frequency voltage based on a sine wave having a predetermined frequency is applied to one of the polarized drive electrodes 202 of the piezoelectric body 201 and to the other drive electrode 203. A frequency voltage by a sine wave having a phase shift at the same frequency as the frequency voltage applied to the drive electrode 202 is applied. The frequency of the applied frequency voltage is such that the center of the piezoelectric body 201 is a bending vibration node, the driver elements 204 and 205 are antinodes of bending vibration, and the longitudinal vibration node of the piezoelectric body 201 coincides with the bending vibration node. It is set to a predetermined numerical value. Then, the vibrator 200 repeats the bending vibration shown in FIGS. 3A to 3C including the restored state shown in FIG. Elliptical vibrations are generated on the surfaces of the children 204 and 205. Therefore, by placing the movable body to be driven on the driver elements 204 and 205 side of the vibrator 200 while being in pressure contact with each other, the movable body moves according to the direction of the elliptical vibration generated on the surfaces of the driver elements 204 and 205. It becomes.

  At this time, by changing the phase difference of the frequency voltage applied to the drive electrodes 202 and 203, it is possible to change the shape of the elliptical vibration generated on the surfaces of the drive elements 204 and 205, thereby driving the vibrator 200. Thus, the moving speed of the moving moving body can be changed. For example, if the phase difference of the frequency voltage is 0 °, the speed is 0. However, if the phase difference is increased, the speed gradually increases, the maximum speed is reached when the phase difference is 90 °, and the phase difference is increased beyond 90 °. Then, on the contrary, the speed gradually decreases, and when the phase difference is 180 °, the speed becomes zero again. When the phase difference is set to a negative value, the rotational direction of the elliptical vibration generated in the driver elements 204 and 205 is reversed, and the moving body can be driven in the reverse direction. Also in this case, the maximum speed is obtained when the phase difference is −90 °.

  Next, a vibration isolating unit according to the present embodiment using such a vibrator as a drive source will be described with reference to FIGS. FIG. 4 is an exploded perspective view showing a configuration example of the vibration isolation unit of the present embodiment, and FIG. 5 is a schematic bottom view of the vibration isolation unit showing the simplified shape of each part shown in FIG. 6 is a schematic front view showing the X-axis drive mechanism portion extracted in FIG. 5, FIG. 7 is a cross-sectional view taken along the line AA in FIG. 6, and FIG. 8 is the X-axis in FIG. FIG. 9 is a schematic bottom view showing the drive mechanism portion extracted and enlarged, FIG. 9 is a cross-sectional view taken along line BB in FIG. 8, and FIG. 10 shows the Y-axis drive mechanism portion in FIG. 11 is a schematic front view, FIG. 11 is a cross-sectional view taken along the line CC in FIG. 10, and FIG. 12 is a cross-sectional view taken along the line DD in FIG.

  First, the vibration isolation unit 300 of the present embodiment is a final moving object that moves the holder 38 on which the CCD 31 is mounted in the X axis direction and the Y axis direction together with the optical LPF 32, the dust filter 33, and the like. An X frame 301 having a frame shape having a frame portion 301b surrounding an opening 301a around the photographing optical axis and having a desired size so that the holder 38 can be moved in the Y-axis direction, and an opening 302a around the photographing optical axis A frame (fixing member) 302 that has a frame shape having a frame portion 302b that surrounds the X frame 301, is formed in a desired size so as to be movably mounted in the X-axis direction, and is fixed to a camera body (not shown). .

  An X-axis drive mechanism 310x that moves the X frame 301 in the X-axis direction relative to the frame 302 and a Y-axis drive mechanism 310y that moves the holder 38 in the Y-axis direction relative to the X frame 301 are provided. By moving the holder 38 together with the X frame 301 in the X-axis direction relative to the frame 302 and moving the holder 38 in the Y-axis direction relative to the X frame 301, the CCD 31 mounted on the holder 38 can be moved in the XY plane. It is displaced so as to compensate for blurring in the axial direction and the Y-axis direction.

  Here, the configuration of the X-axis drive mechanism 310x will be described. The X-axis drive mechanism unit 310x includes an X-axis vibrator (first vibrator) 320x and a moving body (first moving body) 311x that is fixed to the X frame 301 and is driven together with the X frame 301. A sliding body 330x to be configured and a pressing mechanism 340x for biasing the X-axis vibrator 320x toward the sliding body 330x (moving body 311x) are provided.

  The X-axis vibrator 320x is a rectangular piezoelectric body having drivers (drive units) 321x and 322x that generate elliptical vibration when a predetermined frequency voltage is applied in accordance with the operating principle of the vibrator 200 described in FIG. Provided on one side of 323x. The X-axis vibrator 320x has a vibrator holder 324x at the center position on the side opposite to the driver elements 321x and 322x of the piezoelectric body 323x, and the protrusion 325x formed on the vibrator holder 324x is shown in FIGS. As shown, the X-axis vibrator 320x is positioned and held so as to be restricted from moving in the X-axis direction by fitting in the groove 342x (holding portion) of the frame 302. With such a configuration, the driving force due to elliptical vibration generated in the driver elements 321x and 322x acts in the X-axis direction.

  The sliding body 330x is formed by fixing a sliding plate 332x on a bearing 331x. The bearing 331x is fixed so as to be integrated with a part of the X frame 301 by, for example, a screw at a position where the driving elements 321x and 322x of the X-axis vibrator 320x are pressed to contact the sliding plate 332x. . Note that the fixing of the sliding body 330x to the X frame 301 is not limited to screwing, but may be bonding or the like, and the fixing method is not particularly limited. Here, as is apparent from FIG. 4, the sliding body 330x is formed with a size smaller than the X frame 301 formed in a desired size (a size corresponding to the X-axis vibrator 320x). Is. Further, the X frame 301 is formed of a resin material having low rigidity, aluminum, or the like, whereas the sliding plate 332x is formed of a material such as ceramic having high wear resistance and high rigidity, and a bearing 331x. Is obtained by quenching a quenchable material such as ferritic stainless steel to increase rigidity.

  In addition, the frame 302 includes a bearing (guide portion) 304x that is disposed at an opening-shaped attachment portion formed in the frame 302 and is fixed with a screw 303x so as to face the bearing 331x of the sliding body 330x. As shown in FIG. 9, a V-groove 305x along the X-axis direction is formed on the bearing 304x by adhering a V-groove plate 306x for preventing wear. As shown in FIG. 9, the bearing 331x is formed with a V-groove 334x (V-groove plate 337x) facing the V-groove 305x (V-groove plate 306x) of the bearing 304x. Here, by inserting the two balls 336x positioned by the retainer 335x between the V-grooves 305x and 334x, the bearings 304x and 331x have two balls 336x arranged in one row along the X-axis direction. It is set as the structure which has. As shown in FIG. 6 and the like, the two balls 336x are positioned in the vicinity of the positions immediately below the driver elements 321x and 322x, and the movement in the X-axis direction is restricted by the retainer 335x. The rolling elements are not limited to balls, and may be rollers.

  The pressing mechanism 340x has one end fixed to the frame 302 by a screw 344x through a spacer 343x and holding the X-axis vibrator 320x, and a screw 345x that fixes the other end of the pressing plate 341x to the frame 302. A pressing spring 347x is provided around the spacer 346x and biases the pressing plate 341x so that the driver elements 321x and 322x of the X-axis vibrator 320x are pressed against the sliding plate 332x. The pressing force by the pressing mechanism 340x is set to a very large force of about 15N (Newton).

  The bearing 331x passes through the center of the ball 336x and can rotate around an axis parallel to the V-groove 334x. However, the bearing 331x is integrated with the X frame 301 and is separated from the bearing 331x in a direction different from the X-axis direction. One ball 307x (rolling element) is disposed between the frame 302 and the X frame 301 at the same position (position distant from the two balls 336x at an equal distance as shown in FIGS. 6 to 8). . As shown in FIG. 7, the ball 307x is maintained in a state of being held in the recess by the urging force of the spring 308x locked between the frame 302 and the X frame 301 in the vicinity of the ball 307x. Are positioned so as to maintain an interval in the photographic optical axis (Z-axis) direction. Here, the urging force of the spring 308x only needs to maintain the clamping state of the ball 307x, and is set to be several steps weaker than the urging force of the pressing spring 347x. Accordingly, the moving body 311x including the X frame 301 and the sliding body 330x can move with respect to the frame 302 by three-point support with the two balls 336x and the one ball 307x. Also, as shown in FIGS. 6 to 8, the ball 307x is disposed on the opposite side of the ball 336x with the photographing optical axis and the opening 301a interposed therebetween, thereby separating the distance between the ball 307x and the ball 336x. Therefore, a stable three-point support structure can be obtained. As described above, according to the present embodiment, the three balls (rolling bodies) can guide the moving direction of the moving body 311x and can also regulate the inclination, thereby enabling stable driving.

  On the other hand, the basic structure of the Y-axis drive mechanism unit 310y is the same as that of the X-axis drive mechanism unit 310x, and the same or corresponding parts are denoted by the same reference numerals with the suffix y, and description thereof is omitted. The Y-axis drive mechanism 310y uses the X frame 301 as a fixing member instead of the frame 302, and uses the holder 38 as a moving object instead of the X frame 301. 38 is provided with a sliding body 330y constituting a moving body (second moving body) 311y to be driven.

  Further, the vibration isolating unit 300 of the present embodiment includes an X-axis gyro (blur detecting means) 350x including an angular velocity sensor that detects a blur (pitch in the pitch direction) around the X axis of the body unit 100, and a Y of the body unit 100. A Y-axis gyro (blur detecting means) 350y including an angular velocity sensor that detects a blur around the axis (blur in the yaw direction) is disposed on the frame 302. As the shake detection means, an acceleration sensor may be used instead of the angular velocity sensor. In addition, a position detection sensor 353 including a Hall element 351 disposed on the frame 302 and a magnet 352 disposed on a part of the holder 38 so as to face the Hall element 351 is provided. Then, an anti-vibration control circuit 355 that controls the vibrator drive circuit 354 for the X-axis vibrator 320x and the Y-axis vibrator 320y based on signals from the X-axis gyro 350x, the Y-axis gyro 350y, and the position detection sensor 353 is provided. The image stabilization control circuit 355 executes a control operation in accordance with an instruction from the Bucom 50.

  Here, a configuration example near the X-axis gyro 350x and the Y-axis gyro 350y will be described with reference to FIGS. 13 is a schematic rear view showing a part of the internal structure of the camera, FIG. 14 is a schematic side view showing a part of the internal structure of the camera, and FIG. 15 is an exploded view showing components around the gyro. It is a perspective view. First, the CCD 31 has a substantially rectangular imaging range 400 centered on the photographic optical axis, and is electrically connected to the main circuit board 36 disposed around the photographic optical axis. In the body unit 100, a drive board 402 having a vibrator drive circuit 354 for driving the X-axis vibrator 320x and the Y-axis vibrator 320y is arranged in parallel with the main circuit board 36.

  The X-axis vibrator 320x and the Y-axis vibrator 320y are arranged along the mutually intersecting sides of the imaging range 400, for example, the bottom side and the left side, and also to the drive board 402 via the flexible printed boards 403x and 403y. Thus, the connection is made near the end of the bottom side of the drive substrate 402 and the end of the left side. Here, the center of the drive substrate 402 does not coincide with the imaging optical axis, and as shown in FIG. 13, the X axis is on a plane parallel to the imaging surface (main circuit board 36) of the CCD 31 with the imaging optical axis as the center. The vibrator 320x and the Y-axis vibrator 320y are arranged so as to be offset toward the side (lower left side).

  Here, the reason why the drive substrate 402 is arranged so as to be offset toward the X-axis vibrator 320x and the Y-axis vibrator 320y is to connect the X-axis vibrator 320x and the Y-axis vibrator 320y to the drive board 402. This is because the flexible printed circuit boards 403x and 403y can be shortened. Further, by arranging in this way, the connecting portion of the X-axis vibrator 320x, the Y-axis vibrator 320y and the drive board 402 can be positioned so as not to overlap the main circuit board 36 in the photographing optical axis direction. It is possible to effectively prevent electrical noise from affecting the main circuit board 36 when driving the X-axis vibrator 320x and the Y-axis vibrator 320y.

  On the other hand, as shown in FIG. 13, the X-axis gyro 350x and the Y-axis gyro 350y are in the vicinity of the X-axis vibrator 320x and the Y-axis vibrator 320y. It is arranged on the lower left corner side where the bottom side and the left side of the imaging range 400 arranged along the line intersect, and is electrically connected to the drive board 402 via the flexible printed board 410. The flexible printed circuit board 410 is connected in the vicinity of the lower left end of the drive circuit board 402 that is located as far as possible outside the projection range of the main circuit board 36 in the photographing optical axis direction.

  Here, the flexible printed circuit board 410 on which the X-axis gyro 350x and the Y-axis gyro 350y are mounted is a metal holding base (first holding member) such as stainless steel that is bent at a right angle and formed into an L shape. By being fixed to 411 with an adhesive member such as a double-sided tape, an arrangement in which the blur detection directions of the X-axis gyro 350x and the Y-axis gyro 350y are orthogonal to each other is secured. The holding base 411 is a base (second holding member) with an adhesive member such as a double-sided tape via plate-like vibration isolating members 412x and 412y at positions on the back side corresponding to the X-axis gyro 350x and the Y-axis gyro 350y, respectively. 413. The anti-vibration members 412x and 412y are made of an elastic member having high vibration damping properties such as sponge rubber or gel silicon rubber. The base 413 is fixed to the frame 302 with screws or the like through the attachment holes 413a.

  In such a configuration, the X-axis gyro 350x detects a blur around the X-axis of the body unit 100, and the Y-axis gyro 350y detects a blur around the Y-axis of the body unit 100 and is driven via the flexible printed circuit board 410. Output to the vibrator driving circuit 354 on the substrate 402. In such a detection operation, a signal that is detected by the X-axis gyro 350x and the Y-axis gyro 350y and transmitted on the flexible printed circuit board 410 is weak and easily affected by electrical noise. Since the axial gyro 350x and the Y-axis gyro 350y are arranged in the vicinity of the X-axis vibrator 320x and the Y-axis vibrator 320y, the wiring length of the flexible printed board 410 with respect to the drive board 402 can be minimized. Therefore, it is possible to minimize the influence of electrical noise on the X-axis gyro 350x, the Y-axis gyro 350y, and the flexible printed circuit board 410 with a small and simple configuration.

  In particular, the X-axis gyro 350x and the Y-axis gyro 350y are arranged on the lower left corner where the bottom and left sides of the imaging range 400 arranged so that the X-axis vibrator 320x and the Y-axis vibrator 320y are aligned. Thus, the influence of electrical noise accompanying the driving of the X-axis vibrator 320x and the Y-axis vibrator 320y can also be suppressed. Furthermore, the connection location of the flexible printed circuit board 410 with respect to the drive board 402 is set near the lower left end of the drive board 402 at a position as far as possible outside the projection range in the imaging optical axis direction of the main circuit board 36. Therefore, the influence of electrical noise from the main circuit board 36 that performs high-speed reading of analog signals can also be suppressed.

  In addition, since the X-axis gyro 350x and the Y-axis gyro 350y are attached to the frame 302, the shake correction mechanism including the control circuit can be configured as a vibration-proof unit 300 in the unit form, and the X-axis gyro 350x In addition, the reference voltage adjustment of the voltage signal output corresponding to the shake that must be performed by the Y-axis gyro 350y can be performed in a unit form in advance, and the assemblability is improved.

  Next, the operation of the X-axis drive mechanism 310x will be described. When a predetermined frequency voltage is applied to the X-axis vibrator 320x to generate elliptical vibrations in the driver elements 321x and 322x, the driver elements 321x and 322x of the X-axis vibrator 320x are slid by the strong biasing force of the pressing mechanism 340x. Since it is in pressure contact with 332x, the sliding body 330x is driven in the rotational direction of the elliptical vibration of the driver elements 321x and 322x.

  At this time, since the pressing force applied to the X-axis vibrator 320x is strong, if the rigidity of the sliding plate 332x and the bearing 331x constituting the sliding body 330x is weak, as shown by the phantom line in FIG. The sliding plate 332x and the bearing 331x are bent by the pressing force, and the driving elements 321x, 322x and the sliding plate 332x come into contact with each other, and the operation becomes unstable or stops operating.

  In this respect, in the present embodiment, since the sliding plate 332x and the bearing 331x constituting the sliding body 330x have high rigidity, the pressing contact state between the driver 321x, 322x and the sliding plate 332x is stabilized, and elliptical vibration is caused. The accompanying driving force is reliably transmitted to the sliding plate 332x, and can be driven in the rotational direction of elliptical vibration with high efficiency. At this time, the sliding body 330x side having the sliding plate 332x is not in surface contact with the frame 302 but is in contact with the rolling method by the balls 336x at the bearings 331x and 304x portions, so even if the pressing force is strong. The sliding body 330x moves reliably with little friction with respect to the frame 302. Since the bearings 331x and 304x have a single-row ball bearing structure along the X-axis direction, the sliding body 330x moves only in the X-axis direction when driven by the X-axis vibrator 320x. When the sliding body 330x moves in this way, the X frame 301 to which the sliding body 330x is fixed also moves in the X-axis direction integrally with the sliding body 330x. In other words, the moving direction of the X frame 301 is also guided by the engagement between the bearings 331x and 304x having a ball bearing structure of one row along the X axis direction.

  In such an operation, the bearing 331x passes through the center of the ball 336x and can rotate around an axis parallel to the V-groove 334x. However, the bearing 331x is integrated with the X frame 301, and the X-axis direction from the bearing 331x is One ball 307x is disposed between the frame 302 and the X frame 301 at different positions in different directions, and the moving body 311x composed of the X frame 301 and the sliding body 330x has two balls with respect to the frame 302. 336x and one ball 307x are supported at three points at a distance from each other, so that the frame 302 can be stably moved in the X-axis direction without causing a rotation due to rotation around an axis parallel to the V-groove 334x. Moving. Therefore, the guide support mechanism for the strong pressing portion with respect to the X-axis vibrator 320x may be a single-row ball bearing bearing structure along the X-axis direction by the bearings 331x and 304x, and the size and structure can be simplified.

  The Y-axis drive mechanism 310y operates in the same manner as the X-axis drive mechanism 310x.

  When the X-axis vibrator 320x and the Y-axis vibrator 320y vibrate in this way, the vibration is also transmitted to the X-axis gyro 350x and the Y-axis gyro 350y attached to the frame 302, which may be erroneously detected as shake. In this regard, in the present embodiment, the holding base 411 to which the flexible printed circuit board 410 mounted with the X-axis gyro 350x and the Y-axis gyro 350y is fixed is attached to the frame 302 via the vibration isolation members 412x and 412y and the base 413. Therefore, vibration generated by driving the X-axis vibrator 320x and the Y-axis vibrator 320y can be suppressed from being transmitted to the X-axis gyro 350x and the Y-axis gyro 350y, and an appropriate shake detection operation can be performed.

  As shown in FIG. 17, vibration isolating members (second vibration isolating members) 414x and 414b similar to the anti-vibration members 412x and 412y are arranged on the surface side of the X-axis gyro 350x and the Y-axis gyro 350y, It may be sandwiched between the X-axis gyro 350x and the Y-axis gyro 350y by pressing with a gyro presser (presser plate) 415 from the outside. The gyro presser 415 is fixed to the table 413 by screwing a screw (not shown) into the screw hole 413b of the table 413 through the hole 415a. Reference numeral 413c denotes a protrusion for positioning when the notch 415v of the gyro presser 415 is engaged. According to this, the anti-vibration effect for the X-axis gyro 350x and the Y-axis gyro 350y is improved.

  In this embodiment, the X-axis gyro 350x and the Y-axis gyro 350y are attached to the frame 302 via the base 413. However, as shown in FIG. You may make it attach to 420. FIG. Here, since the main body 420 is not mounted with a shake correction drive source such as the X-axis vibrator 320x and the Y-axis vibrator 320y, the X-axis vibrator 320x and the Y-axis vibrator are more than attached to the frame 302. The vibration accompanying the driving of 320y becomes difficult to be transmitted to the X-axis gyro 350x and the Y-axis gyro 350y, and the vibration isolation effect is improved.

  Here, as shown in FIG. 14, the quick return mirror 11 and the shutter 15 are attached to the main body 420, and mechanical vibration can be transmitted to the main body 420 at the time of photographing operation or the like. Such mechanical vibrations are also not related to camera shake and are not preferably transmitted to the X-axis gyro 350x and the Y-axis gyro 350y. Therefore, as shown in FIG. 18, the base 413 is fixed to the main body 420 in a state where the anti-vibration member (third anti-vibration member) 421 is pressed and contacted by the exterior member 422 in the body unit 100. Thus, the vibration isolation effect can be enhanced and unnecessary vibrations with respect to the X-axis gyro 350x and the Y-axis gyro 350y can be blocked.

It is a block diagram which shows roughly the electric system structure mainly of the camera of this Embodiment. It is a vertical side view which shows the structural example of an imaging unit. It is a schematic diagram which shows the operation principle of a vibrator. It is a disassembled perspective view which shows the structural example of the vibration isolator of this Embodiment. It is a schematic bottom view of the vibration isolator which shows the shape of each part shown in FIG. 4 in a simplified manner. It is a schematic front view which extracts and shows the X-axis drive mechanism part in FIG. It is the sectional view on the AA line in FIG. FIG. 6 is a schematic bottom view showing an X-axis drive mechanism portion in FIG. 5 extracted and enlarged. It is the BB sectional view taken on the line in FIG. It is a schematic front view which extracts and shows the Y-axis drive mechanism part in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is a schematic back view which shows a part of internal structure of a camera. It is a schematic side view which shows a part of internal structure of a camera. It is a disassembled perspective view which shows the component parts around a gyro. It is explanatory drawing which shows a mode that bending arises with the pressing force with respect to a vibrator | oscillator. It is a disassembled perspective view which shows the component of the modified example around a gyro. It is a schematic side view which expands and shows the principal part which shows another modification.

Explanation of symbols

31 CCD
36 main circuit board 301 X frame 302 frame 320x X-axis vibrator 320y Y-axis vibrator 350x X-axis gyro 350y Y-axis gyro 354 vibrator drive circuit 400 imaging range 402 drive board 410 flexible printed board 411 holding base 412x, 412y anti-vibration Member 413 Stand 414 Vibration isolation member 415 Gyro presser 420 Main body 421 Vibration isolation member 422 Exterior member

Claims (12)

In an imaging apparatus including a camera shake correction apparatus that displaces an imaging element in a first direction orthogonal to the imaging optical axis and a second direction orthogonal to the imaging optical axis and the first direction,
A fixing member;
A first moving body movable relative to the fixing member in the first direction;
A second moving body that holds the image sensor and is movable relative to the first moving body in the second direction;
A first drive source for driving the first moving body;
A second drive source for driving the second moving body;
Blur detection means for detecting blur;
Comprising
The image pickup apparatus, wherein the blur detection unit is arranged in the vicinity of the first drive source and the second drive source. A driving board attached to the fixing member and having a driving circuit for driving the first and second driving sources;
The imaging apparatus according to claim 1, wherein the blur detection unit is electrically connected to the drive substrate. The imaging element has a substantially rectangular imaging range,
The first and second drive sources are arranged along the sides of the imaging range that intersect each other,
3. The imaging apparatus according to claim 1, wherein the blur detection unit is arranged on a corner portion side where the sides arranged so that the first and second driving sources are along each other. 4.   The drive board is arranged close to a side where the first and second drive sources are arranged on a plane parallel to the imaging surface of the imaging element with the imaging optical axis as a center. Item 4. The imaging device according to Item 2 or 3.   The blur detection means is electrically connected to the drive substrate at a position outside the projection range in the imaging optical axis direction of the imaging substrate for the imaging element arranged around the imaging optical axis. The imaging device according to claim 4.   The imaging apparatus according to claim 1, wherein the blur detection unit is attached to the fixing member via a vibration isolation member. The blur detection means is an angular velocity sensor or an acceleration sensor mounted on a flexible printed circuit board,
The flexible printed circuit board is fixed to a first holding member, the first holding member is held by a second holding member via the vibration isolation member, and the second holding member is fixed to the fixing member. The imaging apparatus according to claim 6, wherein the imaging apparatus is configured.   The imaging apparatus according to claim 7, further comprising a second vibration isolation member that is disposed on a surface side of the angular velocity sensor or the acceleration sensor and is sandwiched by being pressed by a pressing plate.   The imaging apparatus according to claim 1, wherein the blur detection unit is attached to a main body of the imaging apparatus via a vibration isolation member. The blur detection means is an angular velocity sensor or an acceleration sensor mounted on a flexible printed circuit board,
The flexible printed circuit board is fixed to a first holding member, the first holding member is held by a second holding member via the vibration isolation member, and the second holding member is fixed to the main body. The imaging apparatus according to claim 9.   The image pickup apparatus according to claim 10, further comprising a second vibration isolation member that is disposed on a surface side of the angular velocity sensor or the acceleration sensor and is sandwiched by being pressed by a pressing plate.   12. The imaging apparatus according to claim 10, wherein the second holding member is fixed to the main body in a state in which a third vibration isolation member is pressed and contacted by an exterior member of the imaging apparatus. .

Images