JP2003110919A - Image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a miniaturized image pickup device in which an imaging device is arranged movably. SOLUTION: In the image pickup device in which an imaging device 16 and a substrate 80 packaged with the imaging device are arranged movably in a plane vertical to an optical axis, an image pickup device 3 is provided with a main body of mirror barrel, a base plate 12 for holding a first actuator 28 extended in a first direction and fixing it on a mirror barrel, a first slider 14 to be engaged movably with the first actuator 28 and to be moved in the first direction in respect to the base plate 12, and a second slider 13 to be engaged movably with the first slider 14 and to be moved in a second direction orthogonal to the first direction while holding a second actuator 56 extended in the second direction, and the imaging device 16 is fixed on the second slider 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital still camera, a digital video camera, or the like, and an image pickup apparatus having an image pickup element that is swingably arranged with respect to a lens barrel for camera shake correction and optical axis alignment.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 9-116910 discloses an image pickup device which limits high frequency components of a subject image before spatial sampling by an image pickup element.

This image pickup apparatus obtains a two-dimensional spatial frequency characteristic by changing the relative position between the image pickup element and a subject imaged on the image pickup element during the exposure period of the image pickup apparatus, and changes the characteristic. In order to reduce the aliasing distortion and reduce the moire, the position of the image pickup device can be changed relative to the image forming means. In order to change the position of the image pickup device in FIG. Is disclosed.

In this driving mechanism, the image pickup device is arranged in a space surrounded by an L-shaped holding member, and one side of the holding member and one side of the image pickup device are formed by a piezoelectric element so that the image pickup device can swing in the X direction. Link. Then, in order to swing the holding member itself connected to the image pickup element in the Y direction orthogonal to the X direction, the other side of the holding member and the base are connected by a piezoelectric element. Then, by applying a voltage having a waveform represented by a trigonometric function to each piezoelectric element, each piezoelectric element expands and contracts, the respective movements are superimposed, and the imaging element swings in a circular or elliptical shape.

However, in the drive mechanism in which the image pickup device and the piezoelectric element are directly connected in this way, the moving range of the image pickup device is extremely narrow, and for example, the image pickup device is arranged so as to correct the deviation of the optical axis for camera shake correction. It cannot be used as a mechanism for large movement. Then, in order to increase the movement width of the image pickup element in this way, the drive mechanism must be increased in size, and as a result, the image pickup apparatus itself is increased in size.

[0006]

Therefore, a technical problem to be solved by the present invention is to provide a small-sized image pickup apparatus in which an image pickup element is movably arranged.

[0007]

In order to solve the above technical problems, the present invention provides an image pickup apparatus having the following configuration.

In the image pickup device, the image pickup element and the substrate on which the image pickup element is mounted are movable in a plane perpendicular to the optical axis.
It is placed at one end of the lens barrel. A driving means for moving the image pickup device is mounted around the image pickup device and in a space between the substrate and the lens barrel.

In the above structure, the image pickup device is fixed to the substrate, and the image pickup device and the substrate are integrally arranged so that incident light is imaged on one end of the lens barrel on the image pickup surface of the image pickup device. It The driving means for moving the image pickup device and the substrate is mounted around the image pickup device and between the substrate and the lens barrel.

In a lens barrel used in an image pickup device using an image pickup element, the higher the image pickup element having a larger number of pixels, the smaller the pitch between the pixels, so that the performance required of the lens barrel becomes higher. Therefore, in order to improve the optical performance per area, it is necessary to use a lens having a large diameter, which tends to increase the lens barrel diameter. In addition, a lens from a standard angle of view to a telephoto lens that requires camera shake correction tends to have a particularly large lens barrel diameter. Therefore, the area around the image pickup device becomes large, and the drive means for driving the image pickup device is mounted in this space. By arranging the driving means in this way, the substrate on which the image pickup element is mounted can be of a size that covers the image pickup element and the driving means, and a processing circuit for the output signal from the image pickup element, etc. Elements other than the image sensor may be arranged separately.

According to the above arrangement, the space around the image pickup element can be effectively utilized, and the image pickup apparatus can be made compact.

The image pickup apparatus of the present invention can be constructed in various modes as follows.

Preferably, the drive means holds a first actuator extending in a first direction and is fixed to the lens barrel, and a base plate movably engaged with the first actuator. A first slider that moves in the first direction, and a second actuator that movably engages the first slider and extends in a second direction orthogonal to the first direction. A second slider that holds and moves in the second direction is provided, and the imaging element is fixed to the second slider.

Also, preferably, the drive means is the first
A base plate that holds a first actuator that extends in the direction of, and that is movably engaged with the first actuator and that moves in the first direction with respect to the base plate, and A first slider for holding a second actuator extending in a second direction orthogonal to the first direction; and a first slider movably engaged with the second actuator and moving in the second direction. Two sliders are provided, and the image pickup device is fixed to the second slider.

In each of the above constructions, the first slider that engages the second slider is engaged with the base plate so as to be movable in the first direction, and the second slider fixes the image pickup element. It moves in the second direction with respect to the first slider. That is, it is possible to compactly and easily configure a drive mechanism that can move an image sensor two-dimensionally by a combination of first and second sliders that move in the first direction and the second direction, respectively. Further, since the movement of the image pickup device is performed by the movement of at least the second slider that fixes the image pickup device, the size of the board on which the image pickup device is mounted can be made larger than at least the second slider.

In each of the above constructions, the base plate, the first slider and the second slider each have an annular shape, and the second slider is inserted and arranged in the ring of the first slider and the ring of the base plate, respectively. To be done.

In the above structure, the second slider located at the center among the members formed in an annular shape, preferably a square annular shape is inserted and arranged in the ring of the first slider and the ring of the base plate, respectively. The size in the height direction can be reduced, and the first and second actuators can be arranged around the lateral side of the image sensor.

Preferably, the first and second actuators are piezoelectric actuators.

In the above structure, by using the piezoelectric actuator, the actuator can be made compact and the accuracy of drive control can be improved.

[0020]

DETAILED DESCRIPTION OF THE INVENTION An image pickup apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the image pickup device is used by being mounted on the digital camera 1. Digital camera 1
Is composed of a camera body 2 and an imaging device 3. The imaging device 3 includes a lens barrel body 7 that is an optical system including a lens 4 and the like.
And a driving device 10 for movably disposing the image pickup device at one end of the lens barrel body 7. The imaging device 10 is attached to the end of the lens barrel body 7. As will be described later, the driving device 10 provided in the image pickup device 3 is provided with an image pickup device such as a CCD. Then, as shown by arrow 5 in FIG. 1, when the digital camera 1 shakes during shooting and the optical axis L entering the lens barrel body 7 is displaced, the image sensor is moved as shown by arrow 6. Correct the deviation of the optical axis.

FIG. 2 is an exploded perspective view of a drive unit used in the image pickup apparatus of FIG. FIG. 3 is an enlarged cross-sectional view of the main part of the imaging device taken along the line I-I in the state where the drive device of FIG. 2 is fixed to the lens barrel body. FIG. 4 shows an enlarged cross-sectional view of the main part of the imaging device taken along the line II-II in the state where the drive device of FIG. 2 is fixed to the lens barrel body. The drive device 10 includes a base plate 12 as a base, a first slider 14 that moves in a horizontal direction (hereinafter, referred to as an X-axis direction) with respect to the base plate 12, and a moving direction of the first slider. On the other hand, a second slider that moves in a vertical direction (hereinafter, referred to as a Y-axis direction), and an image sensor 1 fixed to the second slider.
6 and 6.

As shown in FIGS. 3 and 4, the base plate 12 is fixed to the lens barrel body 7 by adjusting its position (inclination and lens back) with the lens barrel body 7, and is fixed to the screw 98 and the spring 1.
00, the distance between the lens barrel body 7 and the drive unit 10 can be adjusted. The base plate 12 is composed of an annular metal frame 19 that is orthogonal to the optical path direction (hereinafter, referred to as the Z-axis direction) and has a large hole 20 in the center.

From the base plate 12, various arms to be described later (pressing spring hook 21, substrate holding arm 22, floating preventing claw 24, positioning arm 31, rod supporting arm 36) are arranged in the optical axis direction (Z axis direction). It is growing. Also, the metal frame 19
The piezoelectric element 32, the vibration transmission rod 34 and the weight 3
The first linear actuator 28 sandwiched by 0s is fixed in the X-axis direction.

In the first linear actuator 28, the tip and the end (on the side of the piezoelectric element 32) of the vibration transmitting rod 34 are fitted to two rod supporting arms provided on the base plate, and the positioning arm 31 of the base plate 12 is fitted. While the weight 30 is in contact with the base 30, the two fitting portions with the rod supporting arm 36 and the weight 30 are bonded to the base plate 12. For the adhesion between the rod support arm 30 and the vibration transmission rod 34, an adhesive that remains elastic even after curing, such as a silicone adhesive, and for the adhesion between the positioning arm 31 and the weight 30, a soft rubber or silicone. The contained adhesive is preferably used.

Projections 38 extending in the Z-axis direction are provided on the upper surfaces of the two rod supporting arms 36 of the base plate 12. The protrusion 38 is fitted into the movement restriction hole 79 of the first slider 14 during assembly, as described later.

The first slider 14 is located on the image plane side with respect to the base plate 12 in the optical axis direction (Z-axis direction), and has an opening 68 for accommodating the second slider 13 in substantially the same plane. And an annular frame 66 made of aluminum. The first slider 14 includes a first rod contact portion 74 that contacts the vibration transmission rod 34 of the actuator 28 fixed to the base plate 12, and a vibration transmission rod 60 of the actuator 56 fixed to the second slider, which will be described later. A pressing spring hook 72 for locking the pressing spring 70 between the abutting second rod contact portion 76 and the pressing spring hook 21 of the base plate 12, and a movement limiting hole 79.
With.

The first slider 14 is, as shown in FIG.
At the time of assembling, the base plate 12 and the first slider 14 are biased toward the base plate 12 by the pressing springs 70 provided on the pressing spring hooks 72 respectively provided on the first slider 14 and the vibration transmitting rod 3 of the first slider 14.
Rotation around 4 is prevented.

A groove having a V-shaped cross section (see FIG. 3) is provided in the first rod contact portion, and the groove is formed by the actuator 2
8 is in contact with the vibration transmission rod 34 of the cap 4
By sandwiching the vibration transmission rod 34 with 0, frictional coupling is performed slidably along the vibration transmission rod 34. A holding spring 42 is used to fix the first rod contact portion and the cap 40. The first slider 14 is shown in FIG.
FIG. 3 is a structural diagram of the first actuator 28 in which is frictionally engaged. As described above, the actuator 28 is the piezoelectric element 3
2 is sandwiched between the vibration transmitting rod 34 and the weight 30, and is fitted to the rod supporting arm 36 and the positioning arm 31 of the base plate 12 and fixed by the adhesive 33 to fix the fitting backlash. .

The actuator 28 and the base plate 12
As a modified example of fixing between and, a plate spring as shown in FIG. 6 may be used. That is, the leaf spring 35 bent in an L shape is fixed on the base plate 12 so as to be positioned at the tip of the vibration transmitting rod 34, and the tip portion 39 attached to the leaf spring 35 has the tip end of the vibration transmitting rod 34. Try to pierce into The leaf spring constantly urges the vibration transmitting rod 34 toward the piezoelectric element by an elastic force, which prevents the rattling of the rod 34 from being fitted, and at the time of vibration, the rod 34 vibrates by virtue of overcoming the elastic force. Can be able to

Vibration transmission rod 34 of actuator 28
As described above, the first slider 14 is arranged in the.
The first slider 14 sandwiches the vibration transmission rod 34 between the first rod contact portion 74 and the cap 40 and frictionally couples the vibration transmission rod 34. To fix the first rod contact portion 74 and the cap 40,
The holding spring 42 is used. One end of the cap 40 is locked to the first rod abutting portion 74, the central portion abuts on the vibration transmitting rod 34, and the other end is pulled by the holding spring 42. The contact pressure between the cap 40 and the vibration transmission rod 34 is about twice the biasing force of the holding spring 42 used. The holding spring 42 has an oval shape, and both ends thereof come to the center of one straight line portion.
The holding spring 42 fixes the both ends by bridging the end portion and the center of the linear portion between the hook of the cap 40 and the spring hook of the first rod contact portion 74 of the first slider.

The movement restricting hole 79 is provided in the base plate 12 described above.
Loosely fits with a projection 38 provided on the upper surface of the rod support arm 36. The movement limiting hole 79 is a long hole having a length of the movable width of the first slider 14 and extending in the moving direction of the first slider 14, that is, the extending direction of the vibration transmitting rod 34 (X-axis direction), and is a base plate. The rod 12 is fitted with the protrusion 38 on the upper surface of the rod support arm 36, and restricts the first slider 14 from moving (falling off) in the short side direction (Y-axis direction) of the movement restriction hole.

FIG. 7 shows a modification of the fitting of the rod support arm and the first slider. In this modification, a strip-shaped protrusion 77 extending in the moving direction of the first slider, that is, the extending direction of the vibration transmission rod 34 (X-axis direction) is provided on the surface of the first slider 14 facing the base plate. . The rod support arm 36 is provided with a fork portion including a recess 39 provided between the projections 38 so as to sandwich the projections 38 provided at both ends of the upper surface thereof and the strip projections 77 of the first slider. .
When the first rod abutting portion 74 of the first slider 14 is frictionally coupled to the vibration transmitting rod 34 by the cap 40, the recess 39 of the fork portion fits into the strip-shaped protrusion 77 of the first slider 14. To be done.

The second slider 13 has an opening 48 in the bottom wall 44.
Is a resin-made box body having an image pickup element 16 and a heat sink 1.
8 and the low pass filter 17 and the second actuator 56 are held. The heat radiating plate 18 is in contact with the rear surface side of the image pickup device 16 where the image pickup surface is not attached, and the heat sink 18 is attached to the peripheral wall 4 of the second slider.
It is fixed to the second slider by a screw 62 penetrating the screw fixing hole 64 so as to cover the space defined by 6. As shown in FIGS.
A substrate 80 is provided, and the image pickup device 16 is provided on this substrate. The back side of the first substrate 80 is shown in FIGS.
The infrared LED 94 for detecting the position of the second slider, the image sensor driver, the preamplifier and the color separation circuit for processing the photoelectric signal from the image sensor, the white balance adjustment circuit, the analog processing circuit, etc. Part of the element 81 relating to the image signal reading of the image pickup element is mounted.

The low-pass filter 17 is closely attached so as to cover the effective image pickup surface of the image pickup device, and is fitted into the opening 48 of the second slider. At this time, the contact spring arranged around the opening 48 presses the back surface of the image sensor 16 into close contact with the heat dissipation plate 18.

The second actuator 56 held by the second slider 13 is adhesively held by the rod supporting arm 50 provided on the side of the peripheral wall. The tip and the end (the piezoelectric element 59 side) of the vibration transmission rod 60 are respectively connected to the second slider 1
No. 3 is fitted to the two rod supporting arms, and the two fitting points and the weight 58 are bonded to the second slider 13 while the weight 58 is also in contact with the positioning surface 57 of the second slider. . Similar to the bonding of the first actuator described above, the vibration transmitting rod 60 is bonded by an adhesive such as a silicone adhesive that remains elastic even after curing, and a weight 5.
A soft rubber-based or silicone-containing adhesive is preferably used for the contact of 8 with each other.

Second actuator second actuator 56
Is sandwiched between the second rod contact portion 76 of the first slider 13 and the cap 75, and the first slider 14 is frictionally coupled to the second slider 13. A holding spring 78 is used to fix the second rod contact portion 76 and the cap. One end of the cap is locked by the second rod abutting portion 76, the central portion abuts on the vibration transmitting rod 60, and the other end is pulled by the holding spring 78. Cap and vibration transmission rod 60
The contact pressure with is about twice as high as that of the clamping spring 78 used. The holding spring 78 has an elliptical shape similar to that used for the first actuator, and both ends thereof come to the center of one straight line portion. The sandwiching spring 78 fixes the both by hooking the end portion and the center of the linear portion between the hook of the cap and the spring hook of the second rod contact portion 76 of the first slider.

The directional reference plates 52 attached to the opposing peripheral walls 44 of the second actuator of the second slider are provided with concave hard sphere receivers 54 for holding the hard spheres 15 on the front and back thereof.
In a state in which the hard sphere 15 is loosely fitted in the hard sphere receiver 54, it is fixed so as to be sandwiched between the first slider 14 and the base plate 12 via the hard sphere 15. Since the pressing spring 70 is applied between the first slider 14 and the base plate 12 as described above, the second slider 13 is prevented from rotating around the vibration transmission rod 60 of the second actuator.

When the base plate 12 and the first slider 14 are assembled together, the first slider 14 is arranged so as to fit within the area surrounded by the four substrate holding arms 22 provided on the base plate 12 to prevent the floating. Therefore, the upper end thereof is locked by the anti-floating locking claw 24. On the other hand, the box portion of the second slider 13 has the opening 6 of the first slider 14.
8 is incorporated into the first slider 14 so as to fit in 8,
The second slider 13 is integrally configured so as to hang from the first slider 14. As described above, the first slider 14 can slide along the first actuator in the X-axis direction, and at this time, the second slider 13 moves integrally with the movement of the first slider 14, Slider 1
The image sensor 16 fixed to 3 also moves in the X-axis direction. On the other hand, the second slider 13 can move independently in the Y-axis direction with respect to the first slider 14, and since the first slider is fixed to the base plate 12, it does not move with respect to the base plate 12. , Can be moved in the Y-axis direction. Therefore, the image sensor 16 fixed to the second slider 13 also moves in the Y-axis direction.

In the state where the first and second sliders 14 and 13 are incorporated, the substrate holding arm 22 of the base plate 12 has a second
The substrate 82 is fixed. As described above, the first substrate 80 is
Since they are fixed to the second slider 13, they are arranged so as to overlap each other in the optical axis direction, and the movement of the second slider causes the first substrate 80 to move in parallel to the second substrate 82. Both are connected by a flexible substrate 84,
It is possible to send and receive signals. Flexible board 8
4 is bent in the optical axis direction (Z-axis direction) immediately after leaving the first substrate 80 in the horizontal direction, and is connected to the second substrate 82.

On the second substrate 82, a circuit 83 for processing a signal from the image pickup device 16 (first substrate 80) such as an AD converter and a memory controller, and a position detection device 88 (for detecting the position of the second slider 13). (Hereinafter referred to as PSD), and a movement control circuit for two linear actuators based on the PSD position signal and the angular velocity signal from the gyro circuit 86. The PSD is covered with a cover 92 having a slit in order to prevent a detection error, and the light receiving element 90 that receives light from the infrared LED provided on the first substrate 80 detects the position. Angular velocity signals in orthogonal detection directions (X axis, Y axis) are input to the second substrate 82 from the gyro element 86. Further, the linear actuator control signal and the processed image signal are output from the second substrate 82.

The base plate 12, the first slider 14, and the second slider 13, which are mechanisms for supporting and swinging the image pickup device 16, are assembled so as to be fitted into each other, and are attached to the image pickup device 16 and the image pickup device 16. It is located around the first substrate 80 that is directly connected and on the upstream side in the optical axis direction. Therefore, as shown in FIGS.
When 0 is attached to the lens barrel body 7, the mechanism for supporting and swinging the image sensor is the lens barrel body 7 and the image sensor 1
It is possible to reduce the size of an optical unit including a mechanism for supporting and swinging the image pickup device, which is arranged so as to fill the excess space with respect to the contour of the member required for the optical system including the six.

Next, the operation of the image pickup apparatus according to this embodiment will be described. FIG. 8 is a block diagram showing the electrical structure of the drive control circuit of the image pickup apparatus according to this embodiment.

The control circuit detects the positions of the gyro element 86 and the second slider 13 (imaging element 16) for detecting the blur 5 of the optical axis L incident on the camera body, that is, the lens barrel body 7 and outputting an angular velocity signal. A PSD circuit 90 for detection, a microcomputer 102 that performs comprehensive control of the circuit and calculates a movement amount and a position of existence based on an input signal, and a drive pulse of a predetermined frequency based on a drive signal from the microcomputer And a drive circuit 104 for driving the drive circuit. The drive pulse generated from the drive circuit is output to the first and second actuators 28 and 56, and the first drive pulse is output along the actuator.
And the second sliders 14 and 13 move.

The gyro element 86 is fixed to the lens barrel body 7 as shown in FIG. 4, and when the camera body shakes as shown by the arrow 5, the angular velocity in the two axis directions (X axis direction, Y axis direction) is increased. It is detected and output to the microcomputer 102.

When the angular velocity signal is input from the gyro element 86, the microcomputer 102 calculates the amount of movement and the moving speed of the image due to the blur on the image sensor (on the image plane) from the focal length signal of the optical system. The calculated moving speed and the second slider 13
The supply voltage of a predetermined frequency applied to the two linear actuators is determined from the position of (imaging device 16). That is, the microcomputer 102 calculates the position where the second slider 13 (imaging device 16) is presently calculated based on the signal input from the PSD circuit 90 and the gyro element 8
Image sensor 16 based on the angular velocity signal input from
Calculates the position that should be the original position, compares the difference with the current position, and performs feedback control to move the slider so that the image sensor returns to the desired position.

The drive circuit 104 receives a signal from the microcomputer 102 and outputs a drive pulse having a frequency of about 70% of the resonance frequency of the actuators 28 and 56. The drive pulse is applied to the piezoelectric elements 32 and 59 and causes the first and second sliders to move to the vibration transmission rod 3 according to the following principle.
Move along 4, 60.

When a sawtooth wave drive pulse having a gentle rising edge 110 and a sharp falling edge 112 as shown in FIG. 9A is applied to the piezoelectric elements 32 and 59, (b)
As shown in 2), at the gently rising portion 110 of the drive pulse, the piezoelectric elements 32 and 59 are gradually expanded and displaced in the thickness direction, and the vibration transmission rods 34 and 60 fixed to the piezoelectric elements are gently axially moved. Is displaced to. At this time, the slider 1 frictionally coupled to the vibration transmission rods 34 and 60
3 and 14 move together with the vibration transmitting rods 34 and 60 by frictional force.

On the other hand, the steep falling portion 11 of the drive pulse
2, the piezoelectric elements 32 and 59 are rapidly contracted and displaced in the thickness direction and coupled to the piezoelectric elements 32 and 59.
4, 60 are also rapidly displaced in the axial direction. At this time, (b
As shown in 3), the sliders 13 and 14 frictionally coupled to the vibration transmission rods 34 and 60 overcome the friction coupling force by the inertial force and substantially stay at that position and do not move. As a result, the slider moves to the right along the vibration transmission rod from the initial state shown in (b1). Piezoelectric elements 32, 5
By continuously applying the sawtooth wave drive pulse to the slider 9, the sliders 13 and 14 can be continuously moved in the axial direction. It is to be noted that the phrase "substantially staying at that position and not moving" means that the slider 1 is expanded and contracted when the vibration transmission rods 34 and 60 are expanded and contracted in the positive and negative directions.
Although the sliders move while slipping between the vibration transmission rods 3 and 14 and the vibration transmission rods 34 and 60, the movement amounts are not symmetrical, so that the sliders 13 and 14 may be moved in either arbitrary position direction as a whole. Including.

In order to move the sliders 13 and 14 to the left, the waveform of the sawtooth wave applied to the piezoelectric elements 32 and 59 is changed and a drive pulse having a rapid rise and a gentle fall is applied. For example, this can be achieved by the reverse action of the above. The drive pulse is
Square waves and other waveforms can also be applied.

When a drive pulse is applied to the piezoelectric element of the first actuator held by the base plate, the piezoelectric element 32 repeatedly expands and contracts as described above. Expansion and contraction of the piezoelectric element 32 is transmitted to the weight 30 and the vibration transmission rod 34. Due to the difference in inertial mass between the weight 30 and the vibration transmission rod 34, the weight 30 hardly moves, and the expansion and contraction is transmitted only to the vibration transmission rod 34. Although the vibration transmission rod 34 is bonded to the rod support arm 36 as described above, the expansion and contraction of the vibration transmission rod 34 is not hindered because the adhesive 33 elastically bends.
As described above, the first slider 14 frictionally coupled to the vibration transmitting rod 3 due to the speed difference between the left and right movements of the rod.
4 along the X axis. Along with the acceleration / deceleration of the first slider 14, a force acts on the first actuator 28 to move within the fitting backlash, but since the vibration transmission rod 34 and the rod support arm 36 are adhered, no movement occurs. It is possible to prevent not only the correction performance but also the optical performance deterioration due to the focus movement.

When the first slider 14 moves in the X-axis direction, the second slider 13 connected to the first slider also moves in the X-axis direction at the same time. The second slider 13 has less resistance and does not fluctuate in the optical axis direction due to the pressing spring 70 applied between the first slider 14 and the base plate 12 and the hard sphere 15 between the second slider 13 and the base plate 12. Moving. At this time, the first and second substrates 80, 82
The flexible substrate 84 for connecting the first slider absorbs the movement of the first slider as the bent opening angle changes.

On the other hand, the second slider held by the second slider 13
When a drive pulse is applied to the piezoelectric element 59 of the actuator, the piezoelectric element 59 repeatedly expands and contracts as described above. Expansion and contraction of the piezoelectric element 59 is transmitted to the weight 58 and the vibration transmission rod 60. Weight 58 and vibration transmission rod 60
The weight 58 hardly moves due to the difference in inertial mass of
The expansion and contraction is transmitted only to the vibration transmission rod 60. Although the vibration transmission rod 60 is bonded to the rod support arm 50 of the second slider 13 as described above, the expansion and contraction of the vibration transmission rod 60 is not hindered because the adhesive elastically bends. As described above, the second slider 13 moves to the first
The vibration transmitting rod 60 moves (self-propels) relative to the slider 14 in the extending direction (Y-axis direction). Along with the acceleration / deceleration of the second slider 13, a force to move within the fitting backlash acts on the second actuator 56, but since the vibration transmission rod 60 and the rod support arm 50 are adhered, no movement occurs. It is possible to prevent not only the correction performance but also the optical performance deterioration due to the focus movement.

When the drive pulse is applied to the second actuator in this manner, the second actuator is driven independently of the first slider.
Only the slider moves (self-propels) in the Y-axis direction. The second slider 13 has a small resistance due to the pressing spring 70 applied between the first slider 14 and the base plate 12 and the hard sphere 15 between the second slider 13 and the first slider, and has a small fluctuation in the optical axis direction. Move without waking. At this time, the flexible substrate 84 that connects the first and second substrates 80 and 82 absorbs the movement of the second slider due to the bent bent portion.

As described above, the image pickup apparatus according to the present embodiment drives the first and second actuators so as to correct the blur of the camera body detected by the gyro element 86, and It can be moved in the X-axis direction and the Y-axis direction, respectively.

Further, since the substrate for processing the signal of the image pickup device 16 is divided into two parts and the role of processing is divided, the size of the first substrate on which the image pickup device is arranged is the same. Can be made smaller. Therefore, the space accompanying the movement of the image sensor can be reduced, and the size of the entire apparatus can be reduced. Since the image sensor and the substrate for processing the signal are directly connected, noise can be reduced.

Further, since the both are arranged so as to overlap each other in the optical axis direction, the movement of the first substrate, that is, the image pickup device is changed to the second.
It can be easily guided by using the relative position with respect to the substrate, and by disposing the position detection element for that purpose directly on the first and second substrates, it is possible to further reduce the size of the device and to save necessary members in a space. It can be arranged efficiently.

Further, since the substrate movable with the movement of the image pickup device can be constructed by distributing the load of the substrate to the fixed second substrate, the circuit scale and the weight can be reduced. it can. Therefore, the weight of the movable part can be reduced, and the resonance frequency of the device can be kept high. Therefore, the movement control of the image pickup device by the image pickup device by the actuator using the piezoelectric element can be facilitated.

The present invention is not limited to the above embodiment, but can be implemented in various other modes.

For example, in the above embodiment, the second actuator is mounted on the second slider, and the second slider is of a self-propelled type. However, the second actuator is fixed to the first slider, and the second slider is fixed. May be moved. Even with such a configuration, the same operation can be realized. In this case, the first slider is provided with the rod support arm, and the second slider is provided with the second rod contact portion.

Further, in the above embodiment, the substrate is divided so that the second substrate 82 and the first substrate 80 substantially overlap,
Although they are arranged so as to face each other, they may be configured so that only a part thereof overlaps by changing the size of the first substrate and the second substrate or changing the arrangement position.

Further, in the above embodiment, the gyro element 86 is attached to the lens barrel body 7, and the first and second gyro elements are attached.
Although it is configured to transmit the angular velocity signal to the substrates 80 and 82, it may be directly attached to the facing surfaces of the facing first and second substrates 80 and 82. At this time, the microcomputer 102 controls to drive the first and second actuators so that the angular velocity signal from the gyro element becomes zero.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a digital camera equipped with an imaging device of the present invention.

2A is an exploded perspective view of a drive unit used in the image pickup apparatus of FIG. 1, and FIG. 2B is a first perspective view of FIG.
It is a detailed view of an actuator portion.

3 is an enlarged cross-sectional view of an essential part of the imaging device taken along the line I-I in the state where the drive device of FIG. 2 is fixed to the lens barrel body.

FIG. 4 shows a state in which the driving device of FIG. 2 is fixed to the lens barrel body.
FIG. 3 is an enlarged cross-sectional view of a main part of the image pickup device taken along the line II-II.

FIG. 5 is a structural diagram of a first actuator in which a first slider is frictionally engaged.

FIG. 6 is a view showing a modified example of the fixing structure of the first actuator.

FIG. 7 is a view showing a modified example of fitting the rod support arm and the first slider. (A) is a perspective view showing a structure of a rod supporting arm, and (b) is a sectional view showing a fitted state.

8 is a block diagram showing an electrical structure of a drive control circuit of the image pickup apparatus of FIG.

FIG. 9 is a diagram for explaining the driving principle of the actuator. (A) is an example of the waveform of the drive pulse applied to the piezoelectric element. (B) is a figure explaining movement of an actuator.

[Explanation of symbols]

1 digital camera 2 body 3 Imaging device 4 lenses 7 Body 10 Drive 12 base plate 13 Second slider 14 First slider 15 hard sphere 16 Image sensor 17 Low-pass filter 18 Heat sink 19 frames 20 large holes 21,72 Pressing spring hook 22 Board holding arm 24 Lifting prevention locking claw 26 Positioning arm 28 First linear actuator 30 weights 32 Piezoelectric element 34 Drive shaft 36 Rod support arm 38 Projection 40 cap 42,78 clamping spring 44 Bottom plate 46 Peripheral wall 48 openings 50 Rod support arm 52 direction reference plate 54 Hard Ball Receiver 56 Second linear actuator 57 Positioning surface 58 weight 60 drive shaft 62 screws 64 through holes 66 frames 68 openings 70 Pressing spring 74 First rod contact part 76 Second rod contact portion 79 Movement restriction hole 80 First substrate 82 Second substrate 84 Flexible substrate 86 Gyro element

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/225 H04N 5/225 D // H04N 101: 00 101: 00 F term (reference) 2H044 AJ06 2H100 BB06 BB11 CC07 EE00 5C022 AA13 AB46 AC42 AC74 5H680 AA19 BB03 BB13 BB15 BC01 CC06 DD02 DD23 DD66 DD73 DD83 FF24 FF30

Claims (5)

[Claims] 1. An image pickup device in which an image pickup device and a substrate on which the image pickup device is mounted are arranged at one end of a lens barrel so as to be movable in a plane perpendicular to an optical axis, and the image pickup device is moved. An image pickup device, characterized in that a driving means for driving the image pickup device is mounted around the image pickup element and in a space between the substrate and the lens barrel. 2. The driving means holds a first actuator extending in a first direction and is fixed to the lens barrel, and a base plate movably engaged with the first actuator. And a second actuator that moves in the first direction, and a second actuator that movably engages with the first slider and extends in a second direction orthogonal to the first direction. The image pickup device according to claim 1, further comprising a second slider that moves in the second direction, wherein the image pickup element is fixed to the second slider. 3. The drive means holds a first actuator extending in a first direction and is fixed to the lens barrel; and a base plate movably engaged with the first actuator. A first slider that holds a second actuator that moves in the first direction and extends in a second direction that is orthogonal to the first direction; and movably associated with the second actuator. And the second
2. The image pickup apparatus according to claim 1, further comprising a second slider that moves in the direction of, wherein the image pickup element is fixed to the second slider. 4. The base plate, the first slider, and the second slider each have an annular shape, and the second slider is arranged by being inserted into the ring of the first slider and the ring of the base plate, respectively. The image pickup apparatus according to claim 2 or 3, characterized in that. 5. The image pickup apparatus according to claim 2, wherein the first and second actuators are piezoelectric actuators.