JP2003032537A - Imaging device moving apparatus and electronic camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging device moving apparatus that is suitable for making an electronic camera small in size and thin in thickness and can largely shift and imaging device. SOLUTION: The imaging element moving device is provided with the imaging device 11 that images an optical image obtained via a lens system, flexible printed circuit boards 12a, 12b that energize the image pickup device 11 to a fixed position, and piezoelectric actuators 13a, 13b that deliver a generated displacement to the imaging device 11 via the flexible printed circuit boards 12a, 12b to shift the imaging device 11 in an optical axis direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting a focus by moving an image sensor in an electronic camera or the like,
In particular, the present invention relates to an image pickup element moving device suitable for downsizing and thinning.

[0002]

2. Description of the Related Art Electronic cameras such as video cameras and digital still cameras are desired to be further miniaturized and thinned. For example, by incorporating an electronic camera in a mobile phone, PDA (personal digital assistant), etc., not only voice and character data,
There is a desire to send and receive video and images in real time.

As a conventional technique for reducing the size of an electronic camera, for example, there is a "video camera" disclosed in Japanese Unexamined Patent Publication No. 5-48957. In this video camera, instead of moving a focus lens, a piezoelectric actuator moves an image sensor in the optical axis direction to perform focusing. This eliminates the need for a drive mechanism for focusing and reduces the number of parts, which leads to downsizing of the video camera.

[0004]

However, in such a conventional technique, the piezoelectric actuator directly
Since the image pickup device is moved, there is a problem that the image pickup device is moved only by the amount of displacement generated by the piezoelectric actuator, and the moving distance is not sufficient. Therefore, the focusing ability is limited, the type of applicable lens (range of focal length) is limited, and the application of the electronic camera is also limited.

Therefore, the present invention has been made in view of such problems, and is an image pickup device moving apparatus suitable for downsizing and thinning, in which the image pickup device is directly moved by a piezoelectric actuator. An object of the present invention is to provide an image pickup element moving device that can move a larger distance.

[0006]

In order to achieve the above object, an image pickup device moving apparatus according to the present invention includes an image pickup device for picking up an optical image obtained through a lens system and a wiring member for the image pickup device. A flexible circuit board that is connected and urges the image sensor to a fixed position, and transfers the generated displacement to the image sensor via the flexible circuit board to move the image sensor in the optical axis direction. A piezoelectric actuator is provided.

A part of the piezoelectric actuator is fixed to the flexible circuit board, and the flexible circuit board is deformed as a flexible plate to move the image pickup device.

The piezoelectric actuator is composed of a group of two or more independent partial piezoelectric actuators,
The image pickup device moving device further includes a direction sensor that detects a direction of an image pickup surface of the image pickup device with respect to an optical axis, and a signal from the direction sensor so that the image pickup surface of the image pickup device is orthogonal to the optical axis. And a drive control circuit for generating a signal for independently driving each of the two or more partial piezoelectric actuators.

Further, according to the present invention, the image pickup device moving device, a drive circuit for generating a signal for driving a piezoelectric actuator of the image pickup device moving device, a shutter button,
After the signal is generated from the drive circuit so that the image sensor of the image sensor moving device moves to the in-focus position when the shutter button is pressed, an optical image formed on the image sensor is displayed. It may be realized as an electronic camera having a control circuit for reading.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows the first of the present invention.
3 is an external view of the image pickup element moving device 10 according to the embodiment of FIG. The image pickup device moving apparatus 10 is a small size device (for example, about 1) that performs focus adjustment over a wide range by indirectly moving the image pickup device by a piezoelectric actuator.
1 cm, the image pickup device 11 such as a CCD or a CMOS image receiving device (image sensor), its flexible printed board 12a for electrical connection, and the like are shown in the perspective view of FIG. 12b, piezoelectric actuators 13a and 13b that are driving bodies that move the image pickup device 11 in the optical axis direction, sliding members 14a and 14b that transmit displacement of the piezoelectric actuators 13a and 13b to the flexible printed boards 12a and 12b, and flexible -The printed circuit boards 12a and 12b are attached to the sliding member 14
Presser plate 1 for pressing and fixing to a and 14b
7a and 17b, and piezoelectric actuators 13a and 13
Projection 15 as a mounting table for fixing the center position of b
And base substrates 16a and 16b.

The base substrates 16a and 16b are electrical insulators such as epoxy resin, and terminals for electrical connection are printed on the back surface of the base substrate 16b, as shown in FIG. 1 (b). These terminals are the base substrate 16
Via the through holes formed in b, the wirings in the flexible printed boards 12a and 12b and the wiring cables to the piezoelectric actuators 13a and 13b are connected.

The image pickup device 11 has two flexible printed circuit boards 12 which are divided into left and right parts and lead out wiring.
It is held in a fixed position by the biasing forces of a and 12b.
The two flexible printed boards 12a and 12b extending left and right from the image pickup element 11 are bent so as to be folded back, and the end portions thereof are sandwiched between the two base boards 16a and 16b to be pressure-bonded and fixed, and the wiring of Along the way, pressing plates 17a and 17b and sliding members 14a and 1b
It is sandwiched and fixed to 4b.

Two piezoelectric actuators 13a and 13
Reference numeral b denotes a laminated piezoelectric ceramic or the like, which is displaced in the laminating direction when a voltage is applied. Each of the piezoelectric actuators 13a and 13b has a recess at the center thereof that meshes with the protrusion 15 fixed to the base substrate 16a.
Both ends thereof are fixed to the side surfaces of the sliding members 14a and 14b with an adhesive or the like.

The sliding members 14a and 14b are columnar bodies made of plastic or the like, and are fixed to the end portions of the piezoelectric actuators 13a and 13b on the inner side surfaces thereof, and the flexible printed boards 12a and 1b on the upper surface thereof.
2b, but not on the bottom surface thereof, with the base substrate 16a. Therefore, the sliding members 14a and 14b are connected to the piezoelectric actuators 13a and 1a.
Interlocking with the expansion and contraction movement of 3b, it slides on the upper surface of the base substrate 16a so as to slide.

FIG. 2 is a diagram for explaining the operation of focus adjustment by the image pickup device moving apparatus 10 having such a configuration. FIG. 2A shows the piezoelectric actuators 13a and 13a.
2B is a front view of the image pickup device moving apparatus 10 in an idle state in which a voltage is not applied to b, and FIG. 2B is a diagram in which a voltage is applied to the piezoelectric actuators 13a and 13b and the piezoelectric actuators 13a and 13b are displaced in a contracting direction. It is a front view of the image pick-up element moving device 10 when it occurs.

As shown in FIG. 2B, when a voltage is applied and the piezoelectric actuators 13a and 13b contract in the stacking direction, the piezoelectric actuators 13a and 13b.
Since the central portion of b is fixed by the projection 15, the sliding members 14a and 14b fixed to both ends of the piezoelectric actuators 13a and 13b slide and move toward the central portion (projection 15) by an equal amount. To do. When the two sliding members 14a and 14b move so as to approach each other, the flexible printed circuit boards 12a and 12b bend, and the image pickup device 11 is pushed upward (approaching the lens system in the optical axis direction).

That is, since the sliding members 14a and 14b press the flexible printed boards 12a and 12b so as to compress them in the longitudinal direction, the flexible printed boards 12a and 12b are pushed out in the optical axis direction orthogonal to the longitudinal direction. The displacement amount is amplified. As a result, the minute displacements caused by the piezoelectric actuators 13a and 13b are amplified to move the image sensor 11, and the lens having a focal length that changes over a wider range than the conventional technique in which the piezoelectric actuator moves the image sensor directly. It is possible to adjust the focus according to the system.

FIG. 3 is a view showing the arrangement and electrical connection of the two piezoelectric actuators 13a and 13b of the image pickup device moving apparatus 10. Two piezoelectric actuators 1
3a and 13b are ceramic plates polarized in the thickness direction, which are stacked and integrated, and the adjacent ceramic plates have polarization directions different from each other by 180 degrees. The ceramic plates are electrically connected in parallel, and the displacement (for example, several tens of μm) generated in the stacking axis direction is used.

These two piezoelectric actuators 13a and 13b are arranged so as to be parallel to the stacking axis direction, and an independent drive signal (voltage) is applied to each of them. This is because it is possible to control the inclination (parallelism) of the image sensor 11 by making the generated displacements of the piezoelectric actuators 13a and 13b independent so that the image plane of the image sensor 11 is orthogonal to the optical axis. Is.

FIG. 4 is an external view of the image pickup device moving device 20 according to the second embodiment of the present invention. The image pickup device moving device 20 is similar to the image pickup device moving device 10 according to the first embodiment shown in FIG. 1 except that a shaft mechanism (two shafts 22a and 22b, four shaft support portions 21a) is provided.
.About.21d) is added. This shaft mechanism fixes the moving shaft when the sliding members 14a and 14b slide on the base substrate 16a, and does not move the movable parts (the piezoelectric actuators 13a and 13b, the sliding members) that are not fixed to the base substrate 16a. The members 14a and 14b, etc.) are prevented from rising from the base substrate 16a when they expand and contract.

The two shafts 22a and 22b are rods made of plastic or the like, and penetrate the sliding members 14a and 14b (through with play), and both ends of the shafts 21a, 21c and 21b. The shaft is supported by a recess provided on the inner surface of 21d.

FIG. 5 (a) is a front view of the image pickup device moving device 20 shown in FIG. 4, and FIG. 5 (b) is a plan view.
5C is a plan view of the sliding member 14a (14b), FIG.
(D) is a side view of the sliding member 14a (14b).
The through hole of the sliding member 14a (14b) is shown in FIG.
As shown in (d), the two piezoelectric actuators 1 are not in close contact with the shafts 22a and 22b.
Considering that the sliding members 14a and 14b are inclined when 3a and 13b generate different displacements, the base substrate 16
It has a play in a direction parallel to a.

FIG. 6 is an external view of an image pickup device moving device 30 according to the third embodiment of the present invention. The image pickup device moving device 30 is the same as the image pickup device moving device 20 of the second embodiment shown in FIG.
This corresponds to the one to which a kind of sensor (a sensor that measures the parallelism and the movement amount of the image sensor 11) is added. The parallelism of the image pickup device 11 means the degree to which the image pickup surface of the image pickup device 11 is orthogonal to the optical axis, and the moving amount of the image pickup device 11 means the moving amount of the image pickup device 11 on the optical axis. .

The transfer board 31 is an electrically insulating board made of epoxy resin or the like, and is flexible printed boards 12a and 1a.
2b penetrates a gap space between the image sensor 11 and the piezoelectric actuators 13a and 13b in a direction (Y-axis direction shown) orthogonal to the longitudinal direction of 2b (X-axis direction shown), and bends both ends thereof at a right angle. And the base substrate 16
It is fixed to the side surfaces of a and 16b with an adhesive or the like.

FIG. 7A is a sectional view taken along the line AA of the image pickup device moving device 30 shown in FIG. 6 (a plane that passes through the optical axis and is parallel to the Y axis). In addition, in this cross-sectional view, the illustration of components below the bridge plate 31 is omitted.

The back surface of the image pickup element 11 (or the back surface of the flexible print board when the bottom surface of the image pickup element 11 is attached to the flexible print board) and the upper surface of the transfer plate 31 are respectively provided at three locations. , Electrodes such as copper foil are attached facing each other.
Three capacitors 32a to 32c arranged at equal intervals in the axial direction
Are formed.

The three capacitors 32a to 32c function as a distance (position) sensor that utilizes the change in capacitance depending on the distance between the electrodes. Specifically, the capacitors 32a and 32c serve as a sensor that detects the parallelism of the image sensor 11 in the Y-axis direction, while the capacitor 32b functions as a sensor.
1 plays the role of a sensor that detects the amount of displacement in the optical axis direction.

FIG. 7B shows these capacitors 32a.
It is an example of a circuit which measures the parallelism and the amount of displacement of the image sensor 11 by sensing .about.32c. Here, by configuring the two capacitance-voltage converters 33a and 33c and the adder 34 using a constant current source and a differential amplifier, a voltage corresponding to the capacitance difference between the two capacitors 32a and 32c is output as a direction signal, That is, it is output as a signal indicating the parallelism of the image sensor 11 in the Y-axis direction. Similarly, by using one capacitance-voltage converter 33b, a voltage corresponding to the capacitance of the capacitor 32b is output as a displacement signal, that is, a signal indicating the position of the image sensor 11 in the optical axis direction.

Two piezoelectric actuators 13a and 13a are provided depending on the magnitude of the direction signal thus obtained.
By determining the voltage to be applied to each b, the image sensor 11 can be held parallel to the Y-axis direction.

FIG. 8A is an external view of the image pickup device moving device 40 according to the fourth embodiment of the present invention. The image pickup device moving device 40 is a device capable of adjusting the tilt of the image pickup device 11 not only in the Y-axis direction but also in the X-axis direction, and is divided into four sides from four sides of the image pickup device 11 (dots). (Symmetrically) Four flexible printed circuit boards 12a to 12d that draw out wiring, and four fixed and sandwiched between these flexible printed circuit boards 12a to 12d.
Set of sliding members 41a to 41d and pressing plates 42a to 42
d and so on.

FIG. 8B shows the image pickup device moving device 40.
2 is a plan view (here, the image pickup element 11 and the flexible printed boards 12a to 12d are omitted). A protrusion portion 44 of a regular square pole is fixed to the central portion of the base substrate 16a. One end of the laminated piezoelectric actuators 43a to 43d is fixed to the four side surfaces of the protrusion 44, and the sliding members 41a to 41d are fixed to the other ends (tips) of the piezoelectric actuators 43a to 43d. .

Four piezoelectric actuators 43a to 43d
Are provided with independent wirings so that they are driven by respective separate drive signals. With this, by independently driving the four piezoelectric actuators 43a to 43d, it is possible to control the inclination of the image pickup device 11 in two dimensions in the X-axis direction and the Y-axis direction to maintain more complete parallelism. Becomes

The four independent piezoelectric actuators are not limited to the laminated type, but may be the bimorph type. FIG. 9 shows four bimorph type piezoelectric actuators 55a and 55b, 56a and 56.
The structural example of the image pick-up element moving device 50 provided with b, 57a and 57b, 58a and 58b is shown. FIG. 9A is a plan view of the image pickup device moving device 50 (here, the image pickup device 1).
1 is omitted), and FIG. 9B is a cross-sectional view taken along the line BB of the image pickup device moving device 50 shown in FIG. 9A, showing four sets of piezoelectric actuators. 55a
When no voltage is applied to ~ 58b, FIG.
FIG. 6 is a cross-sectional view when a voltage is applied to the four sets of piezoelectric actuators 55a to 58b and the image pickup device 11 is lifted.

Four sets of piezoelectric actuators 55a and 55
b, 56a and 56b, 57a and 57b, 58a and 58b have one end fixed to the protrusion 53 and the other end (tip).
Serves as a free end (cantilever) to support the image pickup element 11, and is arranged in a swastika shape. This is a limited space
This is for accommodating four pairs of bimorph type piezoelectric actuators having a long stroke, and it is possible to generate a large displacement (for example, an amplified displacement of 100 μm or the like) while having a small size (volume).

It should be noted that, as shown in FIG. 9C, the straight line portion forming each stroke of these piezoelectric actuators extends in the longitudinal direction so as to bend in an S-shape when a voltage is applied. Piezoelectric ceramics having different polarization directions are connected to each other at an intermediate position. By such an S-shaped drive, the tip of each stroke of the piezoelectric actuator is prevented from being twisted when a voltage is applied, and the imaging element 11 is lifted upward while maintaining its parallelism.

As another example using the bimorph type piezoelectric actuator, a plan view of FIG. 10A (the image pickup device 11 is not shown here) and FIG.
The image pickup device moving device 60 shown in the front view of FIG. The image pickup device moving device 60 includes two stacked piezoelectric actuators 13a and 13b in the image pickup device moving device 10 according to the first embodiment shown in FIG. 1, and two sets of bimorph type piezoelectric actuators 61a and 61b.
b, 62a and 62b. Here, the bimorph type piezoelectric actuators 61a and 61a
The back surfaces of the b, 62a, and 62b are fixed to the protrusion 63, and displacement is generated in the direction orthogonal to the optical axis by the S-shaped drive, and the sliding member 14 is pressed through the pressing members 64a to 64d.
a and 14b are moved, and further the image pickup device 11 is moved in the optical axis direction via the flexible printed boards 12a and 12b.

Further, as another example using a bimorph type piezoelectric actuator, a plan view of FIG. 11A (the image pickup device 11 is not shown here) and FIG.
The image pickup device moving device 70 shown in the front view of FIG. Here, four sets of piezoelectric actuators 71a
And 71b, 72a and 72b, 73a and 73b, 7
4a and 74b are columns 75, 76, 77, respectively.
The flexible printed circuit boards 12a and 12b fixed by being supported by 78 and having the other end serving as a free end (cantilever) generate a displacement to change the degree of bending of the flexible printed boards 12a and 12b fixed by the sandwiching plates 79a to 79d. That is, the piezoelectric actuator 71a
And 71b, 72a and 72b, 73a and 73b, 7
4a and 74b generate a displacement in a direction parallel to the optical axis, and move the image pickup device 11 in the optical axis direction via the flexible printed boards 12a and 12b. At this time, the flexible printed boards 12a and 12b are
The piezoelectric actuators 71a and 71b, 72a and 72b, 73 are stretched from the state of being largely bent in the S shape to the state of being slightly bent (the change in angle is utilized).
The displacements at the tips of a and 73b, 74a and 74b are amplified, and the image pickup device 11 is greatly lifted.

FIG. 12 is a diagram showing an example in which the image pickup device moving apparatuses 10 to 70 according to the present invention as described above are applied to an electronic device. FIG. 12A shows a mobile phone 80 in which an electronic camera equipped with the image sensor moving device according to the present invention is incorporated.
Is an external view of the above, and a lens 81 of an electronic camera for capturing an optical image is provided above the liquid crystal display screen. 12
(B) is an external view of a PDA (Personal Digital Assistant) 90 in which an electronic camera equipped with the image pickup device moving device according to the present invention is incorporated. 91 is provided.

FIG. 13 shows the PDA shown in FIG.
It is a figure which shows the structure of 90 (only the element relevant to an electronic camera). The PDA 90 includes an image pickup device moving device 30, a lens 91, and an LCD 92 according to the third embodiment.
And an electronic camera including a shutter button 93, a drive circuit 94, a control circuit 95, and a memory 96.

The lens 91 is a focus lens or a zoom lens, and the LCD 92 is a liquid crystal display device.
The shutter button 93 is a push button and is used for the memory 9
Reference numeral 6 is a semiconductor memory card or the like for storing image data.

The drive circuit 94 is composed of a D / A converter, a voltage source circuit, etc., and based on an instruction from the control circuit 95, the two piezoelectric actuators 13a of the image pickup device moving device 30.
And 13b output driving signals 1 and 2 respectively to move the image sensor 11 back and forth in the optical axis direction for focus adjustment, and maintain parallelism so that the image sensor 11 is orthogonal to the optical axis. To do

The control circuit 95 is composed of a CPU, a ROM storing a program, an A / D converter, and the like.
Based on the direction signal from 1 (so that the magnitude of the direction signal is zero), the drive circuit 9 outputs an instruction about the balance between the two drive signals 1 and 2 output from the drive circuit 94.
4 or a displacement signal from the image sensor 11 to give an instruction for focusing to the drive circuit 94, or an image formed on the image sensor 11 based on a depression signal from the shutter button 93. Is read as an image signal, converted into image data such as digital RGB and stored in the memory 96, or the image data stored in the memory 96 is read and transferred to the LCD 92.

When the shutter button 93 is pressed halfway down, the control circuit 95 controls the drive circuit 94 to move the image sensor 11 back and forth to adjust the focus, and then the shutter button 93 is completely released. When pressed down, the image signal from the image sensor 11 is captured. As a result, with only one operation of pressing the shutter button 93, it is possible to perform automatic focusing and image capturing.
The two movements can be linked.

As described above, according to the image pickup device moving apparatus of the present invention, the flexible printed circuit board has three functions, namely (i) wiring lead-out from the image pickup device, and (ii)
It plays a role of amplifying the displacement generated by the piezoelectric actuator and transmitting it to the image pickup element, and (iii) a role of a spring member for urging the piezoelectric actuator to a fixed position. As a result, despite the simple structure, the image sensor can be largely moved, the orientation of the image sensor, etc. can be stabilized, and the size is small, and accurate focus adjustment is possible over a wide range. An electronic camera that can be realized is realized.

The image pickup device moving apparatus according to the present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments.

For example, in the image pickup device moving apparatus 10 shown in FIG. 2, the piezoelectric actuator 13 is applied by applying a voltage.
Although a and 13b contract, the image sensor 11 is pushed to the front and moved to a position close to the lens system.
The structure may be moved in the opposite direction. For example, in FIG.
The state shown in (b) is an idle state (state in which no voltage is applied to the piezoelectric actuators 13a and 13b).
2A so that the state shown in FIG. 2A becomes a driving state (state in which voltage is applied to the piezoelectric actuators 13a and 13b).
It is possible to change the attachment state of 12 and 12b, the polarity of the applied voltage, and the like.

Further, by arbitrarily combining the features of the first to fourth embodiments, an image pickup device moving apparatus having a different form can be realized. For example, by adding the transfer plate 31 shown in FIG. 6 to the image pickup device moving device 40 shown in FIG. 8 and providing four capacitors for detecting inclinations of the image pickup device 11 in the X-axis and Y-axis directions. The inclination of the image pickup device 11 can be detected with high accuracy, and control can be performed to maintain more complete parallelism.

Regarding the tilt and movement amount (position) of the image pickup device, not only an electrical detection system using a capacitor as a sensor but also an optical detection system by reflection of light and an image signal from the image pickup device are used. A detection method or the like based on the included frequency component may be adopted. Then, these various sensors may be mounted on the image sensor to further reduce the size.

Also, by forming various detection circuits, drive circuits, control circuits, etc., and mounting memory ICs, etc. in the vacant areas of the flexible printed circuit board and the base substrate, an electronic camera can be obtained. It is also possible to realize a highly functional and compact image pickup device moving device (electronic camera module) that also has necessary functions.

[0050]

As is apparent from the above description, the image pickup device moving apparatus according to the present invention is connected to the image pickup device for picking up an optical image obtained through the lens system and the image pickup device as a wiring member. At the same time, a flexible circuit board for urging the image pickup element to a fixed position, and a piezoelectric actuator for moving the image pickup element in the optical axis direction by transmitting the generated displacement to the image pickup element via the flexible circuit board. It is characterized by including. As a result, the flexible circuit board has both a wiring material and a spring material, and the imaging device moving device can be made compact.

A part of the piezoelectric actuator is fixed to the flexible circuit board, and the flexible circuit board is deformed as a flexible plate to move the image pickup device. As a result, the displacement generated by the piezoelectric actuator is amplified by the flexible circuit board and transmitted to the image pickup device, so that an image pickup device moving device having a high focusing ability is realized.

The piezoelectric actuator comprises a group of two or more independent partial piezoelectric actuators,
The image pickup device moving device further includes a direction sensor that detects a direction of an image pickup surface of the image pickup device with respect to an optical axis, and a signal from the direction sensor so that the image pickup surface of the image pickup device is orthogonal to the optical axis. And a drive control circuit for generating a signal for independently driving each of the two or more partial piezoelectric actuators. This makes it possible to always make the image pickup surface orthogonal to the optical axis regardless of the position of the image pickup element, and to perform focus adjustment with high accuracy.

As described above, according to the present invention, it is possible to realize an image pickup device moving device capable of moving an image pickup device largely despite its simple structure. It can be applied to a thin and highly functional electronic camera, and its practical value is extremely large.

[Brief description of drawings]

FIG. 1 is an external view of an image pickup element moving device according to a first embodiment of the present invention.

FIG. 2A is an idle state in which no voltage is applied to the piezoelectric actuator of the image pickup device moving apparatus, and FIG.
Shows the state when a voltage is applied to the piezoelectric actuator to drive it.

FIG. 3 is a diagram showing an arrangement and electrical connection of two piezoelectric actuators of the image pickup device moving apparatus.

FIG. 4 is an external view of an image pickup element moving device according to a second embodiment of the present invention.

FIG. 5A is a front view of the image pickup device moving device,
(B) is a plan view, (c) is a plan view of the sliding member,
(D) is a side view of the sliding member.

FIG. 6 is an external view of an image pickup element moving device according to a third embodiment of the present invention.

7A is a cross-sectional view taken along the line AA in FIG. 6, and FIG. 7B is a circuit diagram for measuring the parallelism and displacement of the image sensor by sensing the capacitor shown in FIG. Here is an example.

FIG. 8A is an external view of an image pickup device moving apparatus according to a fourth embodiment of the present invention, and FIG. 8B is a plan view of the inside thereof.

9A and 9B are configuration examples of an image pickup device moving device including four bimorph type piezoelectric actuators, in which FIG. 9A is a plan view of the inside, and FIG. 9B is a diagram in which a voltage is applied to the four piezoelectric actuators. 6A is a cross-sectional view taken along the line BB in FIG. 7A when the image pickup element is not lifted, and FIG. 8C is a cross-sectional view when the image pickup element is lifted by applying a voltage to four sets of piezoelectric actuators.

10A and 10B are configuration examples of another image pickup element moving device provided with a bimorph type piezoelectric actuator, in which FIG. 10A is a plan view of the inside thereof, and FIG. 10B is a front view thereof.

FIG. 11 is a configuration example of still another image pickup element moving device including a bimorph type piezoelectric actuator,
Is a plan view of the inside thereof, and (b) is a front view thereof.

FIG. 12 shows an application example of the image pickup device moving device according to the present invention to an electronic device, and FIG. 12A is an external view of a mobile phone incorporating an electronic camera including the image pickup device moving device,
(B) is an external view of a PDA (personal digital assistant) incorporating an electronic camera including an image sensor moving device.

FIG. 13 is a diagram showing the configuration of the PDA (only the elements related to the electronic camera).

[Explanation of symbols]

10, 20, 30, 40, 50, 60, 70 Image sensor moving device 11 Image sensor 12, 12a-12d Printed circuit boards 13a, 13b, 43a-43d Laminated piezoelectric actuators 14a, 14b, 41a-41d Sliding member 15, 44, 53, 63 Protrusions 16a, 16b Base substrates 17a, 17b, 42a to 42d Pressing plates 21a to 21d Shaft supporting portions 22a, 21b Shaft 31 Transfer plates 32a to 32c Capacitors 33a to 33c Capacitance voltage converter 34 Adder 55a, 55b, 56a, 56b, 57a, 57b, 5
8a, 58b, 61a, 61b, 62a, 62b, 71
a, 71b, 72a, 72b, 73a, 73b, 74
a, 74b Bimorph type piezoelectric actuators 64a to 64d Pushing members 75 to 78 Struts 79a to 79d Clamp plate 80 Mobile phone 81 Lens 90 PDA 91 Lens 92 LCD 93 Shutter button 94 Drive circuit 95 Control circuit 96 Memory

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 13/36 H01L 27/14 D 5C024 17/02 G02B 7/11 P H01L 27/14 N H04N 5/225 G03B 3/00 A 5/335 3/04 // H04N 101: 00 F term (reference) 2H011 AA03 CA00 CA12 2H051 AA00 EA25 FA02 FA07 FA08 FA19 GB15 2H100 BB06 BB11 4M118 BA10 FA06 HA25 HA27 5C022 AA13 AB44 AB46 AC42 AC54 AC70 AC77 5C024 BX01 CY49 EX22 EX23 EX42 HX01

Claims (19)

[Claims] 1. An image pickup device for picking up an optical image obtained through a lens system, and a flexible circuit board connected to the image pickup device as a wiring member and urging the image pickup device to a fixed position. An image pickup element moving device, comprising: a piezoelectric actuator that moves the image pickup element in the optical axis direction by transmitting displacement to the image pickup element via the flexible circuit board. 2. The piezoelectric actuator according to claim 1, wherein a part of the piezoelectric actuator is fixed to the flexible circuit board, and the image pickup device is moved by deforming the flexible circuit board as a flexible plate. Image sensor moving device. 3. The flexible circuit board comprises first and second flexible circuit boards for drawing out wiring from the image pickup element in two directions different by 180 degrees, and the piezoelectric actuator is a stacked columnar body, 3. The image pickup device moving device according to claim 2, wherein both ends thereof are fixed to the first and second flexible circuit boards, respectively. 4. The image sensor movement according to claim 3, wherein the piezoelectric actuator deforms the first and second flexible circuit boards by generating displacement in a direction orthogonal to an optical axis. apparatus. 5. The image pickup device moving apparatus according to claim 4, wherein the central portion of the piezoelectric actuator in the stacking direction is fixed and both ends of the piezoelectric actuator generate the same displacement. 6. The image pickup device according to claim 1, which is held at a position closest to the lens system by the flexible circuit board when a voltage is not applied to the piezoelectric actuator. Image sensor moving device. 7. The image pickup device according to claim 1, which is held at a position farthest from the lens system by the flexible circuit board when a voltage is not applied to the piezoelectric actuator. Image sensor moving device. 8. The piezoelectric actuator comprises a group of two or more independent partial piezoelectric actuators, and the image pickup device moving device further generates a signal for independently driving each of the two or more partial piezoelectric actuators. The image pickup device moving apparatus according to claim 1, further comprising a drive circuit. 9. The image pickup device moving device according to claim 8, wherein the two or more partial piezoelectric actuators are arranged so as to generate a displacement in a parallel direction. 10. The image pickup device moving apparatus according to claim 1, further comprising a direction sensor for detecting a direction of an image pickup surface of the image pickup device with respect to an optical axis. 11. The piezoelectric actuator comprises a group of two or more independent partial piezoelectric actuators, the image pickup device moving device further includes a direction sensor for detecting a direction of an image pickup surface of the image pickup device with respect to an optical axis, A drive control circuit for generating a signal for independently driving each of the two or more partial piezoelectric actuators based on a signal from the direction sensor so that an image pickup surface of the image pickup element is orthogonal to an optical axis. The image pickup device moving device according to claim 1. 12. The image pickup device moving apparatus according to claim 1, wherein the wiring from the image pickup device is point-symmetrically divided by the flexible circuit board. 13. The image pickup device moving apparatus according to claim 12, wherein the wiring from the image pickup device is divided into four directions on the same plane by the flexible circuit board. 14. The image sensor moving device according to claim 1, wherein the image sensor moving device further includes a displacement sensor that detects a displacement amount of the image sensor in the optical axis direction. 15. The image sensor moving device according to claim 14, wherein the displacement sensor is mounted on the image sensor. 16. The image pickup device moving apparatus according to claim 1, wherein the piezoelectric actuator is made of a bimorph type piezoelectric ceramic. 17. The image pickup device moving apparatus according to claim 1, wherein the image pickup device is a CCD. 18. The image pickup device moving apparatus according to claim 1, wherein the image pickup device is a C-MOS image receiving device. 19. The image pickup device moving device according to claim 1, a drive circuit for generating a signal for driving a piezoelectric actuator of the image pickup device moving device, a shutter button, and the shutter button when the shutter button is pressed. And a control circuit for reading an optical image formed on the image pickup device after generating the signal from the drive circuit so that the image pickup device of the image pickup device moving device moves to a focus position. Electronic camera.