JP4934564B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus such as a digital still camera or a digital video camera (hereinafter referred to as “digital camera”) having a camera shake correction function for correcting camera shake during shooting.

  In recent years, in a digital camera that generates a digital image corresponding to a subject image on the basis of an image signal from the image pickup device (CCD or the like) by receiving an image of the subject through a photographing lens system, a camera shake that corrects camera shake at the time of shooting. Digital cameras with a so-called camera shake correction function having a correction function have been put into practical use.

  2. Description of the Related Art Conventionally, as a camera shake correction unit in a digital camera, for example, an imaging element (CCD or the like) is in a plane perpendicular to the optical axis direction of an imaging optical system (XY plane) according to the amount of blur of a subject image caused by camera shake. The structure to which it moves is employ | adopted (for example, refer patent document 1).

The camera shake correction structure as described in Patent Document 1 includes two sliders arranged to be movable in two directions (XY directions) perpendicular to the optical axis direction and orthogonal to each other, and an image sensor on the two sliders. Is moved, and the two sliders are moved in accordance with the amount of blur of the subject image caused by camera shake, thereby moving the image sensor in a plane perpendicular to the optical axis direction to correct camera shake.
JP 2004-274242 A

  In the camera shake correction structure as described above, movement control is performed on the two sliders by energizing driving means (motor, piezoelectric element, etc.) connected to the two sliders. By the way, when the power supply to the driving unit is turned off and the camera shake correction operation is canceled, the center position of the image sensor held on one slider side is shifted from the optical axis due to disturbance such as gravity. A malfunction occurs.

  For this reason, even when the camera shake correction operation is cancelled, it is also possible to control so that the center position of the imaging element held on one slider side is positioned on the optical axis by energizing the driving means. However, power consumption is wasted.

  Accordingly, the inventors of the present application have proposed an image pickup apparatus including an origin position forced holding mechanism that mechanically holds the center position (origin position) of the image sensor on the optical axis when the camera shake correction operation is turned off. (See unpublished Japanese Patent Application No. 2005-305841 (see [0097], FIG. 9, FIG. 12A, etc.) In this imaging apparatus, when the camera shake correction operation is turned off, the origin is A pressing pin (33) fixed to the tip of a forced pressing plate (26) that can reciprocate along the optical axis direction by driving a stepping motor (STM1) of a position forced holding mechanism is fitted in the recess (19a). Thus, it is possible to mechanically fix the center position of the image sensor on the optical axis, thereby turning off the power to the driving means for the camera shake correction operation, thereby reducing power consumption. Can.

  By the way, in the imaging device of the unpublished Japanese Patent Application No. 2005-305841, it is a part of the origin position forced holding mechanism on the side opposite to the object in the optical axis direction (back side of the base member 11) from the imaging element. A forced holding plate is arranged. The forced pressing plate moves in the optical axis direction in a space opposite to the object in the optical axis direction than the image sensor. For this reason, in this imaging device, a space for moving the forced pressing plate to the side opposite to the object in the optical axis direction from the imaging element is required.

  Therefore, the present invention eliminates the need for a space for the forced presser plate (corresponding to the fixed lever of the present invention) to move to the side opposite to the object in the optical axis direction relative to the image sensor in an imaging apparatus equipped with camera shake correction means. An object of the present invention is to provide an imaging apparatus capable of reducing the thickness of the lens barrel in the optical axis direction.

  In order to achieve the above object, the invention according to claim 1 is an image sensor that converts a subject image into an electrical signal by photoelectric conversion, a photographing optical system that forms a subject image on the image sensor, and the photographing optical device. A lens barrel that can be expanded and contracted in the optical axis direction of the imaging optical system, a frame member that holds the image sensor movably in a plane perpendicular to the optical axis, and the frame member An image stabilization apparatus that performs image stabilization by moving in a plane perpendicular to the optical axis, and includes a holding unit that holds the image sensor at a predetermined position. A fixed lever that extends to the vicinity of the frame member, the other end of which is located outside the lens barrel, a shaft member that holds one end of the fixed lever so as to be swingable substantially in the optical axis direction, and one end of the fixed lever Provided on the side and provided on the frame member An engaging member that removably engages with the mating recess and restricts movement of the frame member, and is provided on the other end side of the fixed lever. The shaft member is pivoted to support one end side of the fixed lever. A fixed lever swinging means for swinging substantially in the optical axis direction, and when the lens barrel is extended toward the subject side and a predetermined space is formed between the lens barrel and the frame member, The one end side of the fixed lever is swung substantially in the optical axis direction by the operation of the fixed lever swinging means.

  The invention according to claim 2 is characterized in that the fixed lever swinging means is installed on the outer surface side of the cylindrical member provided with the lens barrel inside.

  The invention according to claim 3 is characterized in that one end side of the engaging member is formed in a spherical shape.

  The invention according to claim 4 is characterized in that the engaging recess is inclined so as to spread from the bottom of the square shape toward the square-shaped opening end on the object side in the optical axis direction.

  The invention according to claim 5 is characterized in that the engaging recess is inclined so as to spread from a circular bottom portion toward a circular opening end on the object side in the optical axis direction.

  According to a sixth aspect of the present invention, a guide hole is provided substantially along the optical axis direction of the fixed lever, and a guide pin that can be inserted into the guide hole is provided on the object side of the base plate in the optical axis direction. It is characterized by providing.

  The invention according to claim 7 is characterized in that a first urging member for urging the object side in the optical axis direction to the base plate side with respect to the shaft member of the fixed lever is provided.

  The invention according to claim 8 is characterized in that a second urging member is provided to urge the vicinity of the guide hole of the fixed lever in a direction orthogonal to the longitudinal direction of the fixed lever. .

  According to a ninth aspect of the present invention, the fixed lever swinging means is held so as to be movable in the optical axis direction, and an operating shaft in which the other end side of the fixed lever is connected to one end side on the base plate side. A cam member loosely inserted on the peripheral surface of the operating shaft so as to be rotatable and movable in the direction of the optical axis, a rotation driving means for rotating the cam member, and a surface on the base plate side of the cam member A cam surface formed on the base plate side and a third urging member for urging the cam surface toward one end of the cam follower, By rotating the cam member forward / reversely by forward / reverse rotation driving, the cam surface is slidably contacted with the cam follower to reciprocate the operating shaft integrally with the cam member, and the other end side is connected. Oscillate the fixed lever. It is a symptom.

  According to a tenth aspect of the present invention, there is provided a thread groove on a circumferential surface of the one end side on the base plate side of the operating shaft, and the other end side of the fixed lever is connected to a lever receiving member engaged with the thread groove. It is characterized by connecting.

  The invention according to claim 11 is characterized in that it has a fourth urging member for urging the base plate side of the operating shaft toward the cam member side.

  According to the first aspect of the present invention, it is not necessary to provide a space for moving the fixing lever (corresponding to the forced pressing plate) on the side opposite to the object in the optical axis direction from the image pickup device. The thickness in the optical axis direction can be reduced.

  According to invention of Claim 2, a fixed lever rocking | fluctuation means can be installed easily.

  According to the invention described in claim 3, since the one end side of the engaging member is formed in a spherical shape, the engaging member can be smoothly engaged with the engaging recess.

  According to invention of Claim 4, 5, an engagement member can be smoothly engaged with an engagement recessed part.

  According to the sixth aspect of the present invention, the guide hole is provided substantially along the optical axis direction of the fixed lever, and the guide pin is inserted through the guide hole so that the guide lever extends in the direction perpendicular to the optical axis of the fixed lever. The backlash can be reduced.

  According to the seventh aspect of the invention, the engaging member can be favorably engaged with the engaging recess by the urging by the first urging member.

  According to the eighth aspect of the present invention, the backlash in the direction perpendicular to the optical axis of the fixed lever can be further reduced by the biasing by the second biasing member.

  According to the ninth aspect of the present invention, the operating shaft can be easily reciprocated with a simple configuration, and the fixed lever to which the other end is connected can be swung.

  According to the tenth aspect of the present invention, since the lever receiving member meshes with the operating shaft, the axial position of the lever receiving member can be easily adjusted, and the fixed lever can be swung accurately. Can do.

  According to the eleventh aspect of the present invention, the operating shaft can be reciprocated without rattling by the urging by the fourth urging member.

Hereinafter, the present invention will be described based on the illustrated embodiments.
<Embodiment 1>

  FIG. 1 is a front view showing an example of a digital camera as an imaging apparatus according to Embodiment 1 of the present invention. The digital camera 1 has a camera shake correction function for correcting camera shake by moving the image sensor in a plane perpendicular to the optical axis direction.

  As shown in FIG. 1, the digital camera 1 is provided with a lens barrel 4 having a photographing lens system 3 attached to the front side of the camera body 2, and the lens barrel 4 has a predetermined retracted position and a predetermined position. It is possible to move along the optical axis of the taking lens system 3 (hereinafter, simply referred to as the optical axis) between the imaging standby position of the camera and the imaging standby position. The taking lens system 3 includes a fixed lens, a zoom lens, a focus lens, and the like (not shown). In addition to the photographing lens system 3, the lens barrel 4 is provided with a shutter unit, a diaphragm unit, and the like.

  As shown in FIG. 2, the lens barrel 4 is installed inside the lens barrel storage cylinder portion 5. The lens barrel storage cylinder 5 is integrally formed on the front side of the base plate 6 installed in the camera body 2. A helicoid cam follower (not shown) formed on the outer peripheral surface of the lens barrel 4 is engaged with a helicoid cam groove (not shown) formed on the inner peripheral surface of the lens barrel housing cylinder 5. The lens barrel 4 moves along the optical axis (Z-axis) direction between a predetermined retracted position and a predetermined imaging standby position by a driving force of a lens barrel driving unit (not shown). FIG. 2 shows a state in which the lens barrel 4 is housed in the retracted position in the lens barrel housing cylinder 5.

  3 is a schematic perspective view showing the front side of the base plate 6, FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3, and FIG. 5 is a lens barrel housing cylinder portion 5 formed integrally with the base plate 6. It is a perspective view which shows the external appearance. 3 to 5, the lens barrel 4 in the lens barrel storage cylinder portion 5 is omitted.

  As shown in FIG. 3, an image sensor holding frame 8 holding an image sensor 7 such as a CCD, and an image sensor holding frame are provided on the surface of a base plate 6 positioned at the center in the lens barrel housing cylinder 5. 8 (image sensor 7) is moved in a plane perpendicular to the optical axis direction to correct camera shake, and the movement of the image sensor holding frame 8 in the direction perpendicular to the optical axis is mechanically restricted and held. A holding mechanism 10 is installed.

(Configuration of the image stabilization mechanism 9)
The camera shake correction mechanism 9 includes a slide frame 11 that movably holds the image sensor holding frame 8, and the slide frame 11 is provided on a base plate 6 in the lens barrel storage cylinder portion 5. Is held movably inside. The image sensor holding frame 8 is inserted through a pair of guide bars 13a and 13b provided on the slide frame 11 and is held so as to be movable in the X-axis direction (vertical direction in FIG. 3). The slide frame 11 is inserted through a pair of guide rods 14a and 14b provided on the slide holding frame 12, and is held movably in the Y-axis direction (left and right direction in FIG. 3).

  Magnets 15a and 15b are arranged on the surface of the slide holding frame 12 so as to be adjacent to the Y axis direction and the X axis direction of the slide frame 11, respectively. Further, the coils 16a and 16b are arranged on the back side of the magnets 15a and 15b so as to face each other. The coil 16a is fixed to a protruding portion (not shown) provided on the slide frame 11, and the coil 16b is fixed to a protruding portion (not shown) provided on the image sensor holding frame 8.

  By controlling the current applied to each of the coils 16a and 16b, the image sensor holding frame 8 is moved in the X-axis direction and the slide frame 11 is moved by the attraction repulsion due to the magnetic field generated between the coils 16a and 16b and the magnets 15a and 15b. Each can be moved in the Y-axis direction.

  The image sensor holding frame 8 and the slide frame 11 are provided with position detection elements (not shown) such as Hall elements for detecting the positions of the image sensor holding frame 8 and the slide frame 11.

  The camera shake correction mechanism 9 controls applied currents to the coils 16a and 16b based on camera shake detection information detected by a gyro sensor (not shown) in the camera body 2 when camera shake occurs during shooting. By this control, attraction repulsion due to a magnetic field is generated between the coils 16a and 16b and the magnets 15a and 15b. Due to the attractive repulsion by the magnetic field, the image sensor holding frame 8 is moved in the X-axis direction and the slide frame 11 is moved in the Y-axis direction so as to cancel the camera shake. Thereby, camera shake correction can be performed.

  Further, as shown in FIG. 6, a fixing pin 23 (see FIGS. 2 to 4) provided at the tip of a fixing lever 22 described later is provided on the surface side of the image sensor holding frame 8 (surface side of the image sensor 7). An engagement hole 19 having a square opening end that is detachably engaged is formed. The engagement hole 19 has an inclined surface that widens from the square bottom in the engagement hole 19 toward the square opening end on the object side in the optical axis direction.

  In addition to this, as shown in FIG. 7, for example, the shape of the engagement hole 19 is an opening end formed in a circular shape on the object side in the optical axis direction from the circular bottom in the engagement hole 19. An inclined surface that spreads toward the surface may be used.

(Configuration of holding mechanism 10)
The holding mechanism 10 includes a drive motor 20, a reciprocating mechanism 21 that converts the rotational motion of the drive motor 20 into a linear reciprocating motion, and a thin plate-like fixed lever 22 that swings by the reciprocating motion of the reciprocating motion mechanism 21 (the forced presser). ), A fixing pin 23 that is detachably engaged with the engagement hole 19 and provided at the tip of the fixing lever 22, and a tip end side (fixing pin 23 side) of the fixing lever 22 is urged to the base plate 6. And a leaf spring member 24 (see FIG. 3).

  A drive motor 20 such as a stepping motor is held by a motor flange 25 that is integrally formed on the outer peripheral surface of the lens barrel housing cylinder 5. A reciprocating mechanism 21 is connected to the output gear 26 fixed to the motor shaft (output shaft) of the drive motor 20.

  2, 4, 5, and 8, the reciprocating mechanism 21 moves in the optical axis direction in a gear portion 28 having a rotation transmission gear 27 that meshes with the output gear 26, and in the shaft hole of the gear portion 28. An operating shaft 29 that is freely inserted, an urging spring 30 provided on the outer peripheral surface of the operating shaft 29, and a cam follower 31 (see FIG. 8) are provided. The operation shaft 29 is disposed along the optical axis direction (Z direction in FIG. 2). One end side (drive motor 20 side) of the operating shaft 29 is held by the motor flange 25 so as to be movable in the optical axis direction, and the other end side (fixed lever 22 side) of the operating shaft 29 is held in the lens barrel housing cylinder portion 5. Is held by a shaft holding plate 32 integrally formed on the outer peripheral surface thereof so as to be movable in the optical axis direction.

  As shown in FIGS. 9A and 9B, a cam surface 33 is formed inside the rotation transmission gear 27, and a cam follower 31 fixed to the motor flange 25 is in contact with the cam surface 33. . The rotation transmission gear 27 is restricted in relative movement with respect to the operation shaft 29 in the optical axis direction by a gear receiving portion 34 provided on the shaft holding plate 32 side of the operation shaft 29, and between the shaft holding plate 32 and the gear receiving portion 34. It is urged toward the motor flange 25 by the urging spring 30 provided on the motor. Thereby, the cam follower 31 is always in contact with the cam surface 33 in the rotation transmission gear 27.

  The fixed lever 22 is formed linearly when viewed from above (the photographing lens system 3 side), and the base plate 6 and the slide holding frame 12 are passed through an opening 5 a formed on the base end side of the lens barrel housing cylinder portion 5. Are arranged along the surface. The vicinity of the intermediate portion of the fixed lever 22 is swingably held by a swing shaft 36 (see FIG. 3) that is pivotally supported by the bearing member 35. The bearing member 35 is provided on the base plate 6. 2 and 4, the swing shaft 36 (bearing member 35) and the leaf spring member 24 are not shown.

  One end of the fixing lever 22 extends to the vicinity of the engagement hole 19 of the image sensor holding frame 8 via the stepped portion 22a, and the one end of the fixing lever 22 is detachably engaged with the engagement hole 19. The fixing pin 23 is fixed. One end side of the fixing pin 23 is formed in a substantially spherical shape. Further, the other end side of the fixing lever 22 is in contact with the distal end portion of the operating shaft 29.

  The upper surface of the fixed lever 22 that is slightly distal to the pivot shaft 36 is urged toward the back side of the base plate 6 (the side opposite to the lens barrel 3) by the leaf spring member 24. The other end side of the leaf spring member 24 is fixed on the base plate 6. Further, a guide hole 22b is formed slightly on the front end side of the step portion 22a of the fixed lever 22, and a guide pin 37 is provided on the base plate 6 so as to be detachably fitted in the guide hole 22b. .

  Next, the operation of the holding mechanism 10 that restricts and holds the movement of the image sensor holding frame 8 will be described.

  When the power switch (not shown) of the digital camera 1 (see FIG. 1) is OFF (the camera shake correction switch (not shown) for operating the camera shake correction mechanism 9 is also OFF), as shown in FIG. The barrel 4 is in the retracted position in the lens barrel storage cylinder portion 5. At this time, the rotation transmission gear 27 meshing with the output gear 26 is rotated counterclockwise by the clockwise driving of the drive motor 20, and the tip of the cam follower 31 is the deep portion of the cam surface 33 (FIG. 9B). It is controlled to be in a sliding contact state.

  Thus, the operating shaft 29 is moved to the motor flange 25 side by a predetermined distance integrally with the rotation transmission gear 27 (gear portion 28) by the biasing force of the biasing spring 30. The upper surface on the other end side is not pressed.

  Therefore, as shown in FIG. 2, one end side of the fixing lever 22 is urged toward the base plate 6 side (lower side in FIG. 2) by the urging force of the leaf spring member 24, so that the fixing pin 23 is imaged. It engages with an engagement hole 19 formed in the element holding frame 8. Thereby, the movement of the image sensor holding frame 8 is restricted, and the image sensor holding frame 8 is mechanically held in a state where the center of the image sensor 7 is located on the optical axis.

  When the power switch (not shown) of the digital camera 1 (see FIG. 1) is turned on, as shown in FIG. 10, the lens barrel 4 is in the retracted position (FIG. 2) in the lens barrel storage cylinder portion 5. To the imaging standby position on the front side (left side in FIG. 10) by the drive mechanism (not shown), and the photographing is ready. Thereby, a predetermined space is obtained between the bottom surface side of the lens barrel 4 and the object side (image sensor 7 side) in the optical axis direction of the image sensor holding frame 8 in the lens barrel housing cylinder 5.

  When a camera shake correction switch (not shown) is turned on, the rotation transmission gear 27 meshed with the output gear 26 is rotated clockwise by the counterclockwise rotation drive of the drive motor 20, and the tip of the cam follower 31 is camped. Control is performed so that the surface 33 is in sliding contact with the shallow portion (FIG. 9B). As a result, the operating shaft 29 moves to the shaft holding plate 32 side by a predetermined distance integrally with the rotation transmission gear 27 (gear portion 28) against the urging force of the urging spring 30, and the tip of the operating shaft 29 is fixed. The upper surface on the other end side of the lever 22 is pressed.

  Therefore, one end of the fixed lever 22 swings to the lens barrel 4 side (left side in FIG. 10) against the urging force of the leaf spring member 24 with the swing shaft 36 (see FIG. 3) as a swing fulcrum. When the fixing pin 23 is disengaged from the engagement hole 19 formed in the image sensor holding frame 8, the mechanical fixing of the image sensor holding frame 8 is released. As a result, the camera shake correction mechanism 9 becomes operable.

  When the camera shake correction switch (not shown) is OFF even when the power switch (not shown) of the digital camera 1 is in the ON state, it is fixed as in the case where the power switch (not shown) shown in FIG. 2 is OFF. The pin 23 is engaged with an engagement hole 19 formed in the image sensor holding frame 8, and the image sensor holding frame 8 is mechanically fixed.

  Thus, according to the digital camera 1 (imaging device) according to the present embodiment, the lens barrel 4 is extended to the subject side, and a predetermined space is provided between the lens barrel 4 and the image sensor holding frame 8. When formed, the fixed lever 22 is positioned on the side opposite to the object in the optical axis direction relative to the image sensor 7 by the structure in which the one end side of the fixed lever 22 is swung substantially in the optical axis direction by the operation of the reciprocating mechanism 21. Space for moving is unnecessary. Thereby, the thickness of the lens barrel 4 in the optical axis direction can be reduced.

  Further, according to the digital camera 1 (imaging device) according to the present embodiment, the lens barrel 4 is extended to the subject side, and a predetermined space is formed between the lens barrel 4 and the image sensor holding frame 8. Even when a digital camera is mounted with high density due to downsizing, thinning, etc., the structure in which one end side of the fixed lever 22 is swung substantially in the optical axis direction by the operation of the reciprocating mechanism 21. The movable fixing lever 22 can be installed without interfering with surrounding parts and wiring.

  Furthermore, in this embodiment, when the power switch (not shown) of the digital camera 1 is ON and the camera shake correction switch (not shown) is OFF, the fixing pin 23 provided on one end side of the fixing lever 22 holds the image sensor. The image sensor holding frame 8 is mechanically fixed by engaging with an engagement hole 19 formed in the frame 8. As a result, the energization of the coils 16a, 16b and the like of the camera shake correction mechanism 9 can be turned off, so that power consumption can be reduced.

  In the above embodiment, the one end side of the fixing lever 22 is urged only to the base plate 6 side by the leaf spring member 24. However, as shown in FIGS. You may form the 1 leaf | plate spring part 24a and the 2nd leaf | plate spring part 24b.

  The first leaf spring portion 24 a of the leaf spring member 24 abuts the upper surface of the fixed lever 22 slightly toward the tip end side than the swinging shaft 36 and biases one end side of the fixed lever 22 toward the base plate 6.

  The second leaf spring portion 24b of the leaf spring member 24 abuts on the side surface of the step portion 22a of the fixed lever 22 and urges the fixed lever 22 in a direction perpendicular to the optical axis. Accordingly, even when there is a predetermined gap or more between the guide hole 22b and the guide pin 37, the guide pin 37 is biased to one side of the guide hole 22b (the side opposite to the second leaf spring portion 24b). As a result, rattling in the direction perpendicular to the optical axis of the fixed lever 22 can be prevented.

<Embodiment 2>
FIG. 13 is a front view showing the lens barrel housing tube portion side on the base plate of the digital camera according to Embodiment 2 of the present invention, and FIG. 14 is a cross-sectional view taken along the line BB of FIG. Note that members having the same functions as those of the first embodiment will be described with the same reference numerals (different reference numerals for some members).

  Also in the present embodiment, as shown in FIGS. 13 and 15, an image pickup device holding an image pickup device 7 such as a CCD on the surface of the base plate 6 located at the center in the lens barrel housing tube portion 5. A holding frame 8, a camera shake correction mechanism 9 a that corrects camera shake by moving the image sensor holding frame 8 (image sensor 7) in a plane perpendicular to the optical axis direction, and a direction perpendicular to the optical axis of the image sensor holding frame 8. A holding mechanism 10a that mechanically restricts and holds the movement is installed.

(Configuration of the image stabilization mechanism 9a)
The camera shake correction mechanism 9 a includes a slide frame 11 that movably holds the image sensor holding frame 8. The slide frame 11 is provided on the base plate 6 in the lens barrel storage cylinder portion 5. Is held movably inside. The image sensor holding frame 8 is inserted through a guide bar 13 provided on the slide frame 11 and is held movably in the X-axis direction (vertical direction in FIG. 13). Note that the opposite side of the image sensor holding frame 8 from the guide rod 13 is also movably held by a guide rod (not shown).

  The slide frame 11 is inserted through a guide rod 14 provided on the slide holding frame 12 and is held so as to be movable in the Y-axis direction (left-right direction in FIG. 13). Note that the side of the slide frame 11 opposite to the guide bar 14 is also movably held by a guide bar (not shown).

  Magnets on which the yokes 15a and 15b are integrally formed are arranged on the surface of the slide holding frame 12 so as to be adjacent to each other in the Y axis direction and the X axis direction of the slide frame 11. Further, the coils 16a and 16b are arranged so as to face each other on the back side of each magnet in which the yokes 15a and 15b are integrally formed. The coil 16a is fixed to a protruding portion (not shown) provided on the slide frame 11, and the coil 16b is fixed to a protruding portion (not shown) provided on the image sensor holding frame 8.

  By controlling the current applied to each of the coils 16a and 16b, the image sensor holding frame 8 is moved to X by attraction and repulsion by a magnetic field generated between the coils 16a and 16b and the magnets integrally formed with the yokes 15a and 15b. The slide frame 11 can be moved in the Y-axis direction in the axial direction.

  The image sensor holding frame 8 and the slide frame 11 are provided with position detection elements (not shown) such as Hall elements for detecting the positions of the image sensor holding frame 8 and the slide frame 11.

  The camera shake correction mechanism 9a controls the current applied to the coils 16a and 16b based on camera shake detection information detected by a gyro sensor (not shown) or the like when camera shake occurs during shooting. By this control, attraction repulsion due to a magnetic field is generated between the coils 16a and 16b and the magnets integrally formed with the yokes 15a and 15b. Due to the attractive repulsion by the magnetic field, the image sensor holding frame 8 is moved in the X-axis direction and the slide frame 11 is moved in the Y-axis direction so as to cancel the camera shake. Thereby, camera shake correction can be performed.

  Further, on the surface side of the image sensor holding frame 8 (the surface side of the image sensor 7), an engagement hole 19 (see FIG. 14) in which a fixing pin 23 provided at the tip of a fixing lever 22 described later is detachably engaged. Is formed. As shown in FIG. 6, the engagement hole 19 has an inclined surface that widens from the square bottom in the engagement hole 19 toward the square opening end on the object side in the optical axis direction. .

(Configuration of holding mechanism 10a)
As shown in FIG. 15, the holding mechanism 10 a includes a driving motor 20, a reciprocating mechanism 21 that converts the rotational motion of the driving motor 20 into a linear reciprocating motion, and a thin plate-like shape that swings by the reciprocating motion of the reciprocating mechanism 21. A fixing lever 22 and a fixing pin 23 provided at the distal end of the fixing lever 22 detachably engaged with the engagement hole 19 are provided.

  The drive motor 20 such as a stepping motor is held by a motor holding plate 40 as shown in FIGS. The motor holding plate 40 is fixed to a flange 41 that is integrally formed on the outer peripheral surface of the lens barrel housing tube portion 5. A reciprocating mechanism 21 is connected to an output gear (not shown) fixed to the motor shaft (output shaft) of the drive motor 20.

  As shown in FIGS. 15 and 17, the reciprocating mechanism 21 is integrated with a rotation transmission gear 43 that meshes with an output gear 42 fixed to a motor shaft (output shaft) of the drive motor 20, and the rotation transmission gear 43. A transmission gear 44 formed in common, a cam gear 45 having a cam surface 45a and meshing with the transmission gear 44, an operating shaft 46 inserted through the shaft hole of the cam gear 45, a cam follower 47 contacting the cam surface 45a, and an operation A first coil spring 48 provided on the peripheral surface on one end side (upper side in FIG. 17) of the shaft 46; a second coil spring 49 provided on the peripheral surface on the other end side (lower side in FIG. 17) of the operating shaft 46; It has. The operation shaft 46 is disposed along the optical axis direction (vertical direction in FIG. 17).

  One end side (upper side in FIG. 17) of the operating shaft 46 is held by the flange 41 so as to be movable in the optical axis direction, and the vicinity of the intermediate portion of the operating shaft 46 is held by the motor holding plate 40 so as to be movable in the optical axis direction. . The cam follower 47 is fixed to the motor holding plate 40.

  The cam gear 45 is restricted in relative movement with respect to the operation shaft 46 in the optical axis direction by a gear receiving portion 46 a provided on the motor holding plate 40 side of the operation shaft 46, and has a spring stop member 50 fixed to the operation shaft 46 at one end side as a spring. The first urging spring 48 that is stopped is urged toward the motor holding plate 40. As a result, the cam surface 45 a of the cam gear 45 is always in contact with the cam follower 47.

  A screw groove of the lever receiving member 51 is screwed into a thread groove 46b formed on the peripheral surface of the other end side (lower side in FIG. 17) of the operating shaft 46. The lever receiving member 51 is connected to the motor holding plate 40. Thus, the second coil spring 49, whose one end is spring-loaded, is always urged toward the other end (lower side in FIG. 17) of the operating shaft 46. The urging force of the first coil spring 48 is set to be larger than the urging force of the second coil spring 49.

  As shown in FIGS. 13 and 15, one end side of the fixing lever 22 is disposed along the surface of the slide holding frame 12, and is bent at a right angle along the corner of the slide frame 11, so that the image pickup device holding frame 8. It extends to the vicinity of the engagement hole 19 (see FIG. 14) formed in the. A fixing pin 23 that is detachably engaged with the engagement hole 19 is fixed to the distal end portion of the fixing lever 22. Further, the connecting portion 22 c that opens in an arc shape on the other end side of the fixed lever 22 is fitted to a lever receiving member 51 that is screwed to the operating shaft 46.

  Near the intermediate portion of the fixed lever 22 (near the other end side of the step portion 22a of the fixed lever 22 located on the side surface of the slide holding frame 12) is swingably held by the swing shaft 36 pivotally supported by the bearing member 35. Has been. A guide hole 22b is formed in a corner portion of the fixing lever 22 bent at a right angle, and a guide pin 37 is provided on the slide holding frame 12 so as to be detachably fitted in the guide hole 22b. Yes.

  Next, the operation of the holding mechanism 10a that controls and holds the movement of the image sensor holding frame 8 will be described.

  When the power switch (not shown) of the digital camera 1 (see FIG. 1) is OFF (the camera shake correction switch (not shown) for operating the camera shake correction mechanism 9a is also OFF), as shown in FIG. The barrel 4 is in the retracted position in the lens barrel storage cylinder portion 5. At this time, the rotation transmission gear 43 and the transmission gear 44 meshed with the output gear 42 are rotated counterclockwise by the clockwise rotation drive of the drive motor 20, the cam gear 45 is rotated clockwise, and the tip of the cam follower 47 is rotated. It is controlled so that the portion is in sliding contact with the deep portion (FIG. 9B) of the cam surface 45a.

  Accordingly, the lever shaft 51 is engaged with the cam gear 45 by the urging force of the first urging spring 48 so that the operating shaft 46 is moved to the flange 41 side by a predetermined distance, and the lever receiving member 51 screwed to one end side of the operating shaft 46 is moved. It is moved to the motor holding plate 40 side.

  Therefore, as shown in FIG. 14, one end side of the fixing lever 22 is biased toward the base plate 6 side (right side in FIG. 14), whereby the fixing pin 23 is formed in the engagement hole formed in the image sensor holding frame 8. 19 is engaged. Thereby, the movement of the image sensor holding frame 8 is restricted, and the image sensor holding frame 8 is mechanically held in a state where the center of the image sensor 7 is located on the optical axis.

  When the power switch (not shown) of the digital camera 1 (see FIG. 1) is turned on, as shown in FIG. 18, the lens barrel 4 is in the retracted position (FIG. 14) in the lens barrel storage cylinder portion 5. To the imaging standby position on the front side (left side in FIG. 18) by the drive mechanism (not shown), and the camera is ready to shoot. Thereby, a predetermined space is obtained between the bottom surface side of the lens barrel 4 and the object side (image sensor 7 side) in the optical axis direction of the image sensor holding frame 8 in the lens barrel housing cylinder 5.

  When the camera shake correction switch (not shown) is turned ON, the rotation transmission gear 43 and the transmission gear 44 meshing with the output gear 26 are rotated clockwise by the counterclockwise rotation drive of the drive motor 20, and the cam gear 45 is rotated. Is rotated counterclockwise, and the tip of the cam follower 47 is controlled so as to be in sliding contact with the shallow portion (FIG. 9B) of the cam surface 45a.

  Thus, the lever shaft 51 is engaged with the cam gear 45 by the biasing force of the first coil spring 48 so that the operating shaft 46 is moved to the motor holding plate 40 side by a predetermined distance and is screwed to one end side of the operating shaft 46. Is moved to the opposite side of the motor holding plate 40.

  Therefore, one end side of the fixed lever 22 swings to the lens barrel 4 side (left side in FIG. 18) with the swing shaft 36 as a swing fulcrum, and the fixing pin 23 is an engagement hole 19 formed in the image sensor holding frame 8. The mechanical fixing of the image sensor holding frame 8 is released by detaching from the frame. As a result, the camera shake correction mechanism 9 becomes operable.

  When the camera shake correction switch (not shown) is OFF even when the power switch (not shown) of the digital camera 1 is ON, the fixed pin is the same as when the power switch (not shown) is OFF (FIG. 14). 23 is engaged with an engagement hole 19 formed in the image sensor holding frame 8, and the image sensor holding frame 8 is mechanically fixed.

  As described above, also in this embodiment, when the lens barrel 4 is extended to the subject side and a predetermined space is formed between the lens barrel 4 and the image sensor holding frame 8, the reciprocating mechanism 21. Due to the structure in which one end side of the fixed lever 22 is swung substantially in the optical axis direction by the operation of, the fixed lever 22 (corresponding to the forced pressing plate) moves to the side opposite to the object in the optical axis direction than the image sensor 7. Space is not required. Thereby, the thickness of the lens barrel 4 in the optical axis direction can be reduced.

  Also in this embodiment, when the lens barrel 4 is extended toward the subject side and a predetermined space is formed between the lens barrel 4 and the image sensor holding frame 8, the reciprocating mechanism 21 operates. With the structure in which one end side of the fixing lever 22 is swung substantially in the optical axis direction, even in a digital camera that is mounted with high density by downsizing, thinning, etc., the swiveling fixing lever 22 is connected to surrounding components. And can be installed without interfering with wiring.

  Furthermore, also in this embodiment, when the power switch (not shown) of the digital camera 1 is ON and the camera shake correction switch (not shown) is OFF, the fixing pin 23 provided on one end side of the fixing lever 22 is an image sensor. Engagement with the engagement hole 19 formed in the holding frame 8 to mechanically fix the image sensor holding frame 8, thereby turning off the energization to the coils 16 a and 16 b of the camera shake correction mechanism 9. Can do. Thereby, power consumption can be reduced.

  Even if the position of the fixed lever 22 is slightly shifted due to an assembly error of the fixed lever 22 or the like, the lever receiving member 51 is engaged with the operating shaft 46. Therefore, the lever receiving member can be adjusted by adjusting the engagement position. The position of 51 in the axial direction is changed, and the displacement of the fixing lever 22 is corrected. Thereby, a fixed lever can be rock | fluctuated accurately.

1 is a front view showing an example of a digital camera as an imaging apparatus according to Embodiment 1 of the present invention. Sectional drawing which shows the state in which the lens barrel of the digital camera which concerns on Embodiment 1 of this invention is accommodated in the retracted position in a lens barrel accommodation cylinder part. 1 is a schematic perspective view showing a front side of a base plate of a digital camera according to Embodiment 1 of the present invention. AA line sectional view of Drawing 3. FIG. 3 is a perspective view showing an external appearance of a lens barrel housing cylinder part formed integrally with a base plate of the digital camera according to Embodiment 1 of the present invention. 1 is a perspective view showing an image sensor holding frame of a digital camera according to Embodiment 1 of the present invention. The perspective view which shows the image pick-up element holding frame in the modification of the digital camera which concerns on Embodiment 1 of this invention. The perspective view which shows the rotation transmission gear which has a cam surface. (A) is a top view which shows the rotation transmission gear which has a cam surface, (b) is sectional drawing which shows a part of cam surface in a rotation transmission gear. Sectional drawing which shows the state which the lens barrel of the digital camera which concerns on Embodiment 1 of this invention extended from the lens barrel storage cylinder part. The perspective view which shows the base plate provided with the leaf | plate spring member which urges | biases the front end side of the fixing lever in the modification of Embodiment 1 of this invention to a base plate. The perspective view which shows the leaf | plate spring member in the modification of Embodiment 1 of this invention. The front view which shows the front side of the base board of the digital camera which concerns on Embodiment 2 of this invention. FIG. 14 is a sectional view taken along line BB in FIG. 13. The perspective view which shows the fixing mechanism of the digital camera which concerns on Embodiment 2 of this invention. The perspective view which shows the reciprocation mechanism of the digital camera which concerns on Embodiment 2 of this invention. The side view which shows the reciprocation mechanism of the digital camera which concerns on Embodiment 2 of this invention. Sectional drawing which shows the state from which the lens barrel of the digital camera which concerns on Embodiment 2 of this invention was drawn | fed out from the lens barrel storage cylinder part.

Explanation of symbols

1 Digital camera (imaging device)
3 Shooting lens system (imaging optical system)
4 Lens barrel (lens barrel)
5 Lens barrel storage tube 6 Base plate 7 Image sensor 8 Image sensor holding frame (frame member)
9, 9a Camera shake correction mechanism (camera shake correction means)
10, 10a Holding mechanism (holding means)
11 Slide frame 12 Slide holding frame 19 Engagement hole (engagement recess)
20 drive motor 21 reciprocating mechanism (fixed lever swinging means)
22 Fixing lever 23 Fixing pin (engaging member)
24 Leaf spring member 27, 44 Rotation transmission gear 29 Actuating shaft 31, 47 Cam follower 33, 45a Cam surface 36 Oscillating shaft (shaft member)
37 Guide pin 45 Cam gear 48 First coil spring 49 Second coil spring

Claims (11)

An imaging device that converts a subject image into an electrical signal by photoelectric conversion, a photographing optical system that forms a subject image on the imaging device, and the photographing optical system are provided, and are extendable in the optical axis direction of the photographing optical system A lens barrel, a frame member that holds the image sensor movably in a plane perpendicular to the optical axis, and a camera shake correction by moving the frame member in a plane perpendicular to the optical axis. In an imaging apparatus having a camera shake correction unit to perform,
Holding means for holding the image sensor in a predetermined position;
The holding means has one end side extending to the vicinity of the frame member and the other end side positioned outside the lens barrel;
A shaft member that holds the one end side of the fixed lever so as to be swingable substantially in the optical axis direction;
An engagement member that is provided on one end of the fixed lever and that removably engages with an engagement recess provided in the frame member to restrict movement of the frame member;
A fixed lever oscillating means provided on the other end side of the fixed lever, and configured to oscillate the one end side of the fixed lever substantially in the optical axis direction by oscillating the shaft member;
When the lens barrel is extended to the subject side and a predetermined space is formed between the lens barrel and the frame member, the one end side of the fixed lever is moved substantially to the light by the operation of the fixed lever swinging means. Swing in the axial direction,
An imaging apparatus characterized by that. The fixed lever swinging means was installed on the outer surface side of the cylindrical member provided with the lens barrel inside,
The imaging apparatus according to claim 1. One end side of the engaging member is formed in a spherical shape,
The imaging apparatus according to claim 1, wherein the imaging apparatus is configured as described above. The engagement concave portion is inclined so as to spread from the square-shaped bottom portion toward the square-shaped opening end on the object side in the optical axis direction.
The imaging apparatus according to any one of claims 1 to 3, wherein the imaging apparatus is characterized in that The engaging recess is inclined so as to spread from the circular bottom to the circular opening end on the object side in the optical axis direction.
The imaging apparatus according to any one of claims 1 to 3, wherein the imaging apparatus is characterized in that A guide hole is provided substantially along the optical axis direction of the fixed lever, and a guide pin that can be inserted into the guide hole is provided on the object side of the base plate in the optical axis direction.
The imaging device according to any one of claims 1 to 5, wherein A first urging member for urging one end side of the fixing lever toward the base plate side from the shaft member;
The imaging apparatus according to any one of claims 1 to 6, wherein the imaging apparatus is configured as described above. A second biasing member is provided for biasing the vicinity of the guide hole of the fixed lever in a direction perpendicular to the longitudinal direction of the fixed lever;
The imaging apparatus according to claim 6. The fixed lever swinging means is held movably in the optical axis direction, and has an operating shaft in which the other end side of the fixed lever is connected to one end side on the base plate side, and is rotatable on a peripheral surface of the operating shaft. And a cam member that is loosely inserted so as to be movable in the optical axis direction, a rotation drive means for rotating the cam member, a cam surface formed on a surface of the cam member on the base plate side, and the base plate A cam follower that contacts the cam surface from the side, and a third biasing member that biases the cam surface toward one end of the cam follower,
By rotating the cam member forward / reversely by forward / reverse rotation drive of the rotation drive means, the cam surface is slidably contacted with the cam follower, and the operating shaft is reciprocated integrally with the cam member, and the other end side is Rocking the fixed lever connected,
The imaging apparatus according to any one of claims 1 to 8, wherein the imaging apparatus is characterized. A screw groove on a peripheral surface on one end side of the base plate side of the operating shaft, and connecting the other end side of the fixed lever to a lever receiving member meshing with the screw groove;
The imaging apparatus according to claim 9. A fourth biasing member that biases the base plate side of the operating shaft toward the cam member;
The imaging apparatus according to any one of claims 1 to 10, wherein the imaging apparatus is characterized in that

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