KR20060088615A - Device for lens transfer - Google Patents

Abstract

The present invention relates to a lens transfer apparatus capable of obtaining sufficient lens transfer displacement by amplifying the displacement of the piezoelectric actuator two or more times.

The lens transfer device is a frame fixed to the base plate; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; The first displacement amplifier to amplify the displacement of the piezoelectric actuator while rotating by the expansion and contraction of the piezoelectric actuator, and further amplifies the displacement amplified in the first displacement amplifier by rotating in accordance with the rotation of the first displacement amplifier member A displacement expanding part including a second displacement amplifying member and a coupler member connecting the first displacement amplifying member and the second displacement amplifying member to be rotatable; And a lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein. And amplifying the displacement of the piezoelectric driver through the displacement enlargement unit to transfer the lens barrel by the amplified displacement.

According to the present invention, it is possible to obtain a sufficient displacement necessary for the transfer of the lens, it is possible to obtain the effect that the lens can be reduced in size.

Piezoelectric Driver, Lens Transport, Displacement Amplification, Lens Barrel

Description

Device Transfer Lens             

1 is a cross-sectional view of a conventional lens transfer apparatus using a cam.

2 is a cross-sectional view of a conventional lens transfer apparatus using a screw.

3 shows a conventional lens transfer apparatus using a piezoelectric element,

   (a) is the overall plan view,

   (b) is a partially exploded perspective view.

4 is an explanatory diagram for explaining the operation of the driving unit and the displacement expanding unit according to the present invention;

   (a) is the state before operation,

   (b) shows the state after operation.

5 is a perspective view of the lens transfer apparatus according to the present invention;

   (a) is an overall perspective view,

   (b) is a perspective view which shows the state in which some components of the displacement expansion part were removed.

6 is a schematic view of a first embodiment of a drive unit and a displacement expanding unit according to the present invention.

FIG. 7 is an explanatory diagram for explaining the operation of the displacement expanding unit of FIG. 6;

   (a) is the state before operation,

   (b) shows the state after operation.

8 is a perspective view of a second embodiment of a drive unit and a displacement expanding unit according to the present invention;

   (a) is an overall perspective view,

   (b) is a perspective view of some parts removed.

9 is a schematic view of another embodiment of the drive unit and the displacement expanding unit according to the present invention.

10 is a graph showing the displacement of the piezoelectric actuator with respect to the input voltage according to the present invention.

Explanation of symbols on the main parts of the drawings

100 ... lens feed 110 ... base plate

120 ... image sensor 150,150a, 150b ... drive

200,200a, 200b ... Displacement Magnifier 210 ... Frame

220 ... Piezoelectric actuator 230,230a, 230b ... First displacement amplifier

240 ... coupler member 250,250a, 250b ... second displacement amplifier

260 ... elastic member 300 ... lens barrel

310 ... Lens 320 ... Projection

330 ... guide part 335 ... elastic means

The present invention relates to a lens transfer device of an optical device having a lens, such as a camera, and more particularly, to a sufficient lens transfer displacement by amplifying the displacement of the piezoelectric actuator at least two times in order to implement a variable focal length and zoom function. It relates to a lens transfer device that can be obtained and can be applied to small optical devices.

In general, the optical apparatus includes a lens transfer device for transferring a lens using a cam, a screw, or a piezoelectric element. In this case, the lens transfer apparatus uses a motor or piezoelectric elements as a means for generating power, and uses a cam or screw as a means for transmitting power.

Therefore, the lens transfer apparatus is configured to implement a zooming function or a focusing function by changing the relative distance of the lens by transferring the lens by the driving force.

1 shows a zoom lens barrel 10 of US Pat. No. 6,268,970 for moving a lens using a cam.

US Patent 6,268, 970 is configured to move each lens group 12a, 14a, 16a along a cam curve formed in the barrel 12, 14, 16 to maintain a relative distance that fits the zoom or focal length.

In this structure, the relative position of each lens group 12a, 14a, 16a is easily determined by the shape of the cam curve during operation, and uses an electromagnetic motor as its driving source. At this time, the zoom lens barrel 10 is provided with a plurality of reduction gears, and is configured to convert the rotational movement of the barrel moving along the cam curve to a linear movement has a problem that the structure is complicated.

In addition, the lens conveying apparatus described above has a problem in that it is difficult to miniaturize because a plurality of reduction gears are provided, and a large amount of power is required because of the use of an electromagnetic type motor, and the resolution for lens conveyance is low.

On the other hand, Figure 2 shows the zoom lens mechanism of the camera to move the lens using a screw.

That is, the fixed lens group 22a is coupled to the camera body 22 on the subject side, and a storage space is formed therein. An electromagnetic motor 24 is provided in this storage space, and a guide screw 24a is coupled to the shaft portion of the motor 24.

A power transmission member 26 is coupled to an outer circumference of the guide screw 24a, and a lens barrel 28 is coupled to one side of the power transmission member 26.

In addition, the lens barrel 28 is coupled to the moving lens group 28a, the barrel 28 is moved in the optical axis direction by the guide shaft 29 coupled in the optical axis direction inside the camera body 22 Are combined so that

Therefore, when the motor 24 operates, the power transmission member 26 moves in the optical axis direction as the guide screw 24a rotates and the guide screw 24a rotates. When the power transmission member 26 moves in the optical axis direction, the barrel 28 is guided by the guide shaft 29 and also moves in the optical axis direction to implement a zoom function.

However, since the zoom lens mechanism 20 of the camera also uses an electromagnetic motor, a plurality of reduction gears are required, which makes it difficult to miniaturize. In addition, the generation of electromagnetic waves generated from the motor may not be eliminated, and the resolution of the transport may be low, thereby causing difficulty in precise control.

3A and 3B show a driving device 30 of US Pat. No. 6,215,605 for moving a lens using a piezoelectric element to solve the problems of the above-described schemes.

In other words, the piezoelectric element 32 is fixed to the base block 34 and the displacement is transferred to the driving round bar 36 so that the preload generated in the slide part 38a and the inertia force and acceleration effect of the lens frame 38 are the lens L1. , L2, L3, L4). In addition, according to the waveform of the input voltage, the lens frame 38 is moved together with the driving round bar 36, or by the relative movement that is sliding, it is possible to transfer in both directions.

On the other hand, since the drive device 30 does not use an electromagnetic type of motor, its electromagnetic wave does not occur structurally, and since it does not use a longitudinal reduction gear or the like as a power transmission means, its structure can be simplified.

However, since the driving rod 36 is fixed and the barrel length cannot be changed, there is a limitation in miniaturization and the driving circuit is complicated because the driving signal writes an asymmetric waveform rather than a sinusoidal signal.

In addition, since the displacement caused by the driving of the piezoelectric element is extremely small, there is a problem in that sufficient displacement necessary for conveying the lens cannot be obtained.

Therefore, there is a need for a lens transfer apparatus that can be mounted in a small volume, has a high resolution of transfer, enables precise control, and can obtain a sufficient transfer displacement while operating with a small driving force.

The present invention is to solve the above-mentioned conventional problems, to provide a compact lens transfer apparatus that can obtain a sufficient displacement required to perform the zoom function or the auto focus function by amplifying the displacement generated in the piezoelectric actuator two or more times. For the purpose of

In addition, a large displacement can be obtained with only a small driving force as compared with the prior art, and an object of the present invention is to provide a lens transfer device having excellent transfer resolution.

The present invention to achieve the above object, the frame fixed to the base plate; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; The first displacement amplification member rotates by the expansion and contraction of the piezoelectric actuator and amplifies the displacement amplified in the first displacement amplification member by rotating according to the rotation of the first displacement amplification member. The displacement expanding unit includes a second displacement amplifying member and a coupler member for rotatably connecting the first displacement amplifying member and the second displacement amplifying member; And a lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein. And amplifying the displacement of the piezoelectric driver through the displacement enlargement unit to transfer the lens barrel by the amplified displacement.

In this case, the second displacement amplifier member preferably includes a body extending from the rotational shaft connected to the coupler member to further amplify the displacement amplified in the first displacement amplifier member, the extended body is the piezoelectric actuator More preferably, it is bent from a rotational shaft connected with the coupler member to amplify the displacement in the other direction.

Also preferably, the first displacement amplifying member may be in point contact or line contact with the piezoelectric driver, and the displacement expanding part may further include an elastic member for elastically supporting the second displacement amplifying member.

Preferably, the lens barrel may be provided with a guide for guiding the transport in the optical axis direction.

The lens transfer apparatus may further include elastic means installed between the lens barrel and the base plate to elastically support the lens barrel.

On the other hand, the outer circumferential surface of the lens barrel is formed with a projection to contact the output end of the displacement expansion portion, the displacement expansion portion is preferably in contact with the inner surface or the outer surface of the projection portion to convey the lens barrel.

As another aspect, the present invention, the frame fixed to the base plate; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; The first displacement amplifier to amplify the displacement of the piezoelectric actuator while rotating by the expansion and contraction of the piezoelectric actuator, and further amplifies the displacement amplified in the first displacement amplifier by rotating in contact with the output terminal of the first displacement amplifier Displacement expansion unit having a second displacement amplifying member to make; And a lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein. And amplifying the displacement of the piezoelectric driver through the displacement enlargement unit to transfer the lens barrel by the amplified displacement.

In this case, the first displacement amplification member and the second displacement amplification member is rotated about each of the hinge axis installed in the frame, it is preferable to have a body which is bent and extended to amplify the displacement of the piezoelectric actuator in a different direction. Do.

As another aspect, the present invention, the frame; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; A displacement enlargement unit which is in contact with one side of the piezoelectric actuator and has at least two displacement amplification members rotating around each hinge axis to amplify the displacement of the piezoelectric actuator; And a lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein. And amplifying the displacement in the longitudinal direction of the piezoelectric actuator at least two times to convey the lens barrel.

Preferably, the displacement expanding portion amplifies the displacement in a direction different from the displacement of the piezoelectric actuator.

In this case, the displacement expanding unit rotates in contact with one side of the piezoelectric actuator to amplify the displacement of the piezoelectric actuator and the first displacement amplifying member rotates as the first displacement amplifying member rotates. A second displacement amplifier member for additionally amplifying the amplified displacement, and a coupler member for rotatably connecting the first displacement amplifier member and the second displacement amplifier member.

The first displacement amplifier includes a first displacement amplifying member which rotates in contact with one side of the piezoelectric actuator to amplify the displacement of the piezoelectric actuator, and a first displacement amplifying member that rotates in contact with an output end of the first displacement amplifying member. It may be provided with a second displacement amplifier for further amplifying the displacement amplified by.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

4 is an explanatory view illustrating the operation of the displacement expanding unit according to the present invention, FIG. 5A is an overall perspective view of the lens conveying apparatus, FIG. 5B is a perspective view of the first displacement amplifying member and the coupler member removed, and FIG. 6 FIG. 7 is a schematic diagram of a first embodiment of a drive unit according to the present invention, and FIG. 7 is an explanatory diagram for explaining the operation of the drive unit of FIG. 8 is a perspective view of a second embodiment of the drive unit according to the present invention, FIG. 9 is a schematic view of another embodiment of the drive unit according to the present invention, and FIG. 10 shows a displacement of the piezoelectric actuator with respect to an input voltage according to the present invention. One graph.

As shown in FIG. 5, the lens transport apparatus 100 according to the present invention includes a frame 210 fixed to the base plate 110, a piezoelectric driver 220 mounted on the frame 210, and the piezoelectric driver ( A displacement expanding unit 200 for amplifying the displacement of the 220, and a lens barrel 300 is brought into contact with the displacement expanding unit 200.

The base plate 110 corresponds to the lower surface of the housing of the optical device having the lens. In this case, the base plate 110 is provided with an image sensor 120 for detecting an image formed from the lens.

As shown in Figure 5, the frame 210 is fixed to the base plate 110 through a known coupling means.

The piezoelectric driver 220 is mounted on the frame 210 and expands and contracts according to the applied voltage to generate driving force necessary for the transfer of the lens barrel 300.

In addition, the displacement expanding unit 200 amplifies the displacement of the piezoelectric actuator 220 at least two times to transfer the lens barrel 300.

As shown in FIG. 5B, in which the first displacement amplifier member 230 and the coupler member 240 are removed from the lens transport apparatus 100 of FIG. 5A, the lens barrel 300 has at least one lens therein. 310 is mounted, and is transferred in the optical axis direction of the lens 310 by the displacement amplified by the displacement expanding unit 200.

In this case, the lens barrel 300 may further include a guide part 330 for guiding the lens barrel 300 to be transferred in the optical axis direction.

The guide unit 330 may be provided in the form of a guide pin fixed to the frame 110 and a guide hole formed through the outside of the lens barrel 300, as shown in Figure 5, the lens barrel 300 is an optical axis Any guide structure can be used if it can be conveyed in the direction.

On the other hand, the outer circumferential surface of the lens barrel 300 is formed with a protrusion 320 to contact the output end 253 of the displacement expansion unit 200, the displacement expansion portion on the inner surface or the outer surface of the protrusion 320 The output end 253 of the 200 is in contact with each other to transport the lens barrel 300.

That is, as shown in FIG. 5, the output end 253 of the displacement expanding unit 200 may be in contact with the upper surface of the protrusion 320, but according to the design of the displacement expanding unit 200, It may be in contact with the lower surface, it may be in contact with the inner surface of the groove formed in the interior of the protrusion 320. In addition, by fixing the output end 253 and the protrusion 320 of the displacement expansion unit 200 in contact with each other, the lens barrel 300 may be configured to be transferred according to the transfer of the output end 253.

Preferably, the lens transfer apparatus 100 further includes elastic means 335 for elastically supporting the lens barrel 300 between an upper surface of the base plate 110 and a lower surface of the lens barrel 300. You may.

At this time, the elastic means 335 provides the elastic force required to return the conveyed lens barrel 300 to its original position, and by adjusting its elastic coefficient to adjust the feed force generated in the piezoelectric actuator 220. It may be.

The elastic means 335 may be provided in the form of a coil spring on the outer circumferential surface of the guide portion 330 as shown in FIG. 5, but is not limited thereto, and the lens barrel 300 may be elastically supported. It may be installed in any space between the 300 and the base plate 110.

Referring to Figure 4, it looks at in more detail with respect to the action of the displacement expanding unit according to the present invention.

The present invention is characterized by providing a lens transfer apparatus capable of obtaining a sufficient displacement necessary for transfer by amplifying the displacement of the piezoelectric actuator that is stretched in the longitudinal direction according to the applied voltage at least two times through the displacement enlargement portion.

As shown in FIG. 4, when a voltage is applied to the piezoelectric driver P to expand and contract in the longitudinal direction, the piezoelectric driver rotates the first lever L1. At this time, the first lever L1 rotating through the hinge shaft H1 amplifies the displacement of the piezoelectric actuator P by b / a times based on the principle of the lever.

In addition, when the first lever L1 rotates, the second lever L2 in contact with the first lever L1 rotates around the hinge axis H2, and the end of the second lever L2 is rotated. The displacement of is amplified by d / c times the displacement of the first lever L1.

As a result, the displacement amplified by two displacement amplifications becomes (b / a) × (d / c) of the displacement of the piezoelectric actuator P, so if b / a is 12 and d / c is 15, for example Displacement of the end of the second lever (L2) has a displacement amplified by 180 times than the displacement of the piezoelectric actuator (P).

As an example, when the piezoelectric actuator is changed while forming a hysteresis loop as shown in FIG. 10 according to the voltage to which the displacement is applied, the difference in displacement between −20 volts and 80 volts becomes 430 μm, thereby transferring the lens through two displacement amplifications. Sufficient displacement is achieved.

As such, when the piezoelectric driver is used, the driving force required for the transfer is smaller than that in the case of the conventional electromagnetic motor, and the electromagnetic wave is not generated, and the lens transfer apparatus having excellent resolution of the transfer can be obtained. In addition, there is an advantage that a sufficient lens feed displacement can be obtained by amplifying the displacement at least twice using the principle of lever.

6 and 7 will be described in more detail with respect to the first embodiment of the displacement expanding unit according to the present invention.

The driving unit 150 illustrated in FIG. 6 includes a frame 210 fixed to the base plate, a piezoelectric driver 220 having a longitudinal displacement and a displacement in accordance with the voltage mounted and applied to the frame 210, and the displacement. It is configured to include an enlarged portion 200.

At this time, the piezoelectric actuator 220 needs to adjust the mechanical tolerances during assembly and keep the preload constant. To this end, it is preferable that the preload adjusting means 221 for adjusting the mechanical tolerance and preload of the piezoelectric actuator 220 is installed.

As an example, the preload adjusting means 221 may be mounted in a screw form on one side of the frame 210 to press one side of the piezoelectric actuator 220 as shown in FIG. 6, but is not limited thereto. It may be installed to contact the upper surface of 220.

On the other hand, the displacement expanding unit 200 is rotated by the expansion and contraction of the piezoelectric actuator 220, the first displacement amplifier 230 to amplify the displacement of the piezoelectric actuator 220 and the first displacement amplifier ( A second displacement amplifying member 250 which additionally amplifies the displacement amplified by the first displacement amplifying member 230 by rotating in accordance with the rotation of the 230, and the first displacement amplifying member 230 and the second displacement amplifying member. And a coupler member 240 for rotatably connecting the 250.

In this case, the output end 253 of the second displacement amplifying member 250 contacts the protrusion 320 of the lens barrel 300 to transfer the lens barrel 300 by the displacement amplified in the optical axis direction as shown in FIG. 5. .

As shown in FIG. 6, one side of the first displacement amplification member 230 is rotatably installed around the first hinge shaft 231 installed on the frame 210, and the other side is the coupler member 240 and the first side. It is rotatably installed through the rotating shaft 232.

In addition, one side of the second displacement amplifier member 250 is rotatably installed around the second hinge shaft 251 installed on the frame 210, the other side of the second rotation shaft 252 of the coupler member 240 It is rotatably installed through.

As shown in FIG. 6B, when a voltage is applied to the piezoelectric driver 220 to extend and have a longitudinal displacement, the first displacement amplifier member 230 contacting the piezoelectric driver 220 through the protrusion 233 may be formed. The first hinge shaft 231 rotates around the coupler, and thus the coupler member 240 rotates.

As a result, the second displacement amplifier member 250 connected to the coupler member 240 through the second rotation shaft 251 rotates about the second hinge shaft 251.

At this time, in order to increase the effect of the displacement amplification, as shown in FIG. 6, the distance L1 between the first hinge axis 231 and the first rotation axis 232 is the second hinge axis 251 and the second rotation axis 252. It is preferable that it is larger than the distance L2 between them.

In addition, the second displacement amplification member 250 extends from the second rotation shaft 252 connected to the coupler member 240 to further amplify the displacement amplified by the first displacement amplification member 230. Is preferably provided.

The extended body 258 may extend in a straight line from the body 257 between the second hinge shaft 251 and the hinge shaft connecting the second rotation shaft 252, but the driving unit 150 and the displacement expanding unit In order to reduce the size of the 200, it is preferable to be formed in a bent shape as shown in FIG. 6.

As such, the lens barrel 300 can be transferred in a direction different from the displacement of the piezoelectric actuator 220 through the extended body 258 of the bent shape, thereby increasing the degree of freedom of design and the efficiency of space utilization. This has the advantage that it is more advantageous for miniaturization.

Through the displacement expanding unit 200, the displacement of the piezoelectric actuator 220 is amplified by the first displacement amplifying member 230, and the displacement amplified by the first displacement amplifying member 230 is additionally a second displacement. Since it is amplified through the amplification member 250, there is an advantage that a sufficient transfer displacement necessary for the transfer of the lens can be obtained.

On the other hand, it is preferable that the first displacement amplifier member includes a protrusion 233 to make point contact or line contact with the piezoelectric driver. As such, when the protrusion 233 making line contact or point contact makes contact with the piezoelectric actuator 220, the operating point of the piezoelectric actuator 220 in contact with the first displacement amplifier member can be made constant, thereby controlling the amount of displacement amplification. It becomes easy.

In addition, the displacement expanding unit 200 may further include an elastic member 260 that elastically supports the second displacement amplifying member 250. For example, the elastic member 260 may be mounted on the insertion rod 254 formed in the extended body 258 to provide an elastic force between the second displacement amplifier member 250 and the piezoelectric driver 220. The mounting position is not limited as long as the second displacement amplifier can elastically support the second displacement amplifier and provide the elastic force when the second displacement amplifier is returned.

Next, a second embodiment of the displacement expanding unit according to the present invention will be described with reference to FIG. 8.

FIG. 8A is an overall perspective view of the displacement expanding unit, and FIG. 8B is a perspective view showing an internal structure of a part of the frame 210a removed.

In order to avoid unnecessary duplication, descriptions of the same or similar parts as those of the displacement expanding unit of FIGS. 6 and 7 will be omitted.

As shown in FIG. 8, the driving unit 150a according to the second embodiment includes a frame 210a, a piezoelectric driver 220a, and a displacement expanding unit 200a fixed to the base plate.

The displacement expanding unit 200a includes a first displacement amplifying member 230a for amplifying the displacement of the piezoelectric driver 220a while being rotated by the expansion and contraction of the piezoelectric driver 220a, and the first displacement amplifying member 230a. And a second displacement amplifying member 250a for further amplifying the displacement amplified by the first displacement amplifying member 230a by rotating in contact with the output terminal 235a.

At this time, the first displacement amplifier member 230a is rotated around the first hinge shaft 231a installed in the frame 210a when the piezoelectric actuator 220a is stretched to push the protrusion 233a. In addition, when the output end 235a of the first displacement amplifying member 230a and the input end 255a are in contact with each other, the second displacement amplifying member 230a may contact the second hinge shaft 251a installed in the frame 210a. Rotate to the center.

As such, the displacement amplified through the first displacement amplifier 230a and the second displacement amplifier 250a is transmitted to the lens barrel 300 through the output end 253a, whereby the lens barrel 300 is amplified. It is transferred as much as the displacement.

In addition, as shown in FIG. 8B, the first displacement amplifying member 230a may include a body 238a that is bent and extended to amplify the displacement of the piezoelectric actuator 220a in another direction. On the contrary, the second displacement amplifying member 250a may be bent to extend.

Meanwhile, an elastic member 260a may be provided between the frame 210a and the second displacement amplifying member 250a to provide the elastic force required to return the lens barrel 300 to its original position.

In addition, in order to adjust the mechanical tolerance and the preload of the piezoelectric actuator 220a, it is preferable that a preload adjusting means 221a mounted in a screw form on one side of the frame 210a is installed.

FIG. 9 illustrates another embodiment of the driving unit 150b and the displacement expanding unit 200b, and the output end 235b of the first displacement amplifier 230b and the input end 255b of the second displacement amplifier 250b. It is the same as the displacement expansion part 200a of FIG. 8 except that this contact form is not a protrusion.

5 and 7, look at the operation of the lens transfer apparatus 100 according to the present invention.

When a voltage is applied to extend the piezoelectric driver 220, the piezoelectric driver 220 extends in the longitudinal direction to rotate the first displacement amplifier member 230, and the coupler member 240 rotates accordingly. In addition, as the coupler member 240 rotates, the second displacement amplifying member 250 rotates. That is, the displacement of the piezoelectric actuator 220 is amplified twice by the first displacement amplifying member 230 and the second displacement amplifying member 250, thereby providing sufficient displacement for the lens transfer, and the second displacement amplifying amplifier. The body 258 extending from the member 250 may transfer the lens barrel 300 in a direction perpendicular to the displacement of the piezoelectric actuator 240.

On the contrary, when a voltage is applied to reduce the piezoelectric driver 220, the piezoelectric driver 220 is shortened to its original state, and the lens barrel 300 is elastically in contact with the second displacement amplifier 250. The elastic force of the elastic means 335 mounted below the member 260 or the lens barrel 300 returns to its original position. On the other hand, even if the elastic member 260 or the elastic means 335 is not provided, the lens transfer apparatus 100 may be configured to return to its original position by the weight of the lens barrel 300.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I want to make it clear.

As described above, according to the present invention, the displacement generated in the piezoelectric actuator is amplified two or more times through the displacement enlargement unit to obtain sufficient displacement required for the lens transfer, and the advantageous effect of the excellent resolution of the transfer can be obtained.

In addition, since there is no fear of generating electromagnetic waves since there is no use of an electromagnetic motor and no screw or gear device is required, the structure is simple and can be miniaturized, and a large displacement can be obtained with only a small driving force.

Moreover, the amplification of the displacement of the piezoelectric actuator in a different direction has the effect that it is possible to implement a lens conveying apparatus that can efficiently use the freedom of design and space.

Claims (20)

A frame fixed to the base plate; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; The first displacement amplifier to amplify the displacement of the piezoelectric actuator while rotating by the expansion and contraction of the piezoelectric actuator, and further amplifies the displacement amplified in the first displacement amplifier by rotating in accordance with the rotation of the first displacement amplifier member A displacement expanding part including a second displacement amplifying member and a coupler member connecting the first displacement amplifying member and the second displacement amplifying member to be rotatable; And A lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein; Including; And amplifying the displacement of the piezoelectric actuator through the displacement enlargement unit to transfer the lens barrel by the amplified displacement. The method of claim 1, And the second displacement amplifying member has a body extending from a rotational shaft connected with the coupler member to further amplify the displacement amplified by the first displacement amplifying member. The method of claim 2, And the extended body is bent from a rotational shaft connected with the coupler member to amplify the displacement of the piezoelectric actuator in a different direction. The method of claim 1, The displacement expanding unit further comprises an elastic member for elastically supporting the second displacement amplifying member. The method of claim 1, The lens barrel of claim 1, wherein the lens barrel comprises a guide for guiding the transfer in the optical axis direction. The method of claim 1, Protruding portion is formed on the outer circumferential surface of the lens barrel to contact the output end of the displacement expanding portion, And the displacement expanding part transfers the lens barrel in contact with an inner surface or an outer surface of the protrusion. The method of claim 1, Preload adjusting means for adjusting the tolerance of the piezoelectric driver or the preload acting on the piezoelectric driver; Lens transfer device further comprising a. A frame fixed to the base plate; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; The first displacement amplifier to amplify the displacement of the piezoelectric actuator while rotating by the expansion and contraction of the piezoelectric actuator, and further amplifies the displacement amplified in the first displacement amplifier by rotating in contact with the output terminal of the first displacement amplifier Displacement expansion unit having a second displacement amplifying member to make; And A lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein; Including; And amplifying the displacement of the piezoelectric actuator through the displacement enlargement unit to transfer the lens barrel by the amplified displacement. The method of claim 8, And the first displacement amplifying member and the second displacement amplifying member rotate about the respective hinge axes of the frame. The method of claim 8, And the first displacement amplifying member or the second displacement amplifying member has a body which is bent and extended to amplify the displacement of the piezoelectric actuator in another direction. The method of claim 8, The first displacement amplifier member is in point contact or line contact with the piezoelectric driver, And the input end of the second displacement amplifier member is in point contact or line contact with the output end of the first displacement amplifier. The method of claim 8, The displacement expanding unit further comprises an elastic member for elastically supporting the second displacement amplifying member. The method of claim 8, The lens barrel of claim 1, wherein the lens barrel comprises a guide for guiding the transfer in the optical axis direction. The method of claim 8, Elastic means installed between the lens barrel and the base plate to elastically support the lens barrel; Lens transfer device further comprising a. The method of claim 8, Protruding portion is formed on the outer circumferential surface of the lens barrel to contact the output end of the displacement expanding portion, And the displacement expanding part transfers the lens barrel in contact with an inner surface or an outer surface of the protrusion. The method of claim 8, Preload adjusting means for adjusting the tolerance of the piezoelectric driver or the preload acting on the piezoelectric driver; Lens transfer device further comprising a. frame; A piezoelectric driver that is stretched in accordance with the voltage applied to the frame and has a displacement in the longitudinal direction; A displacement enlargement unit which is in contact with one side of the piezoelectric actuator and has at least two displacement amplification members rotating around each hinge axis to amplify the displacement of the piezoelectric actuator; And A lens barrel in contact with an output end of the displacement expanding unit and being transferred in an optical axis direction of a lens mounted therein; Including; And amplifying the displacement in the longitudinal direction of the piezoelectric actuator at least two times to convey the lens barrel. The method of claim 17, And the displacement expanding unit amplifies the displacement in a direction different from that of the piezoelectric actuator. The method of claim 18, The displacement expanding unit rotates in contact with one side of the piezoelectric actuator to amplify the displacement of the piezoelectric actuator and the first displacement amplifier amplified by the first displacement amplifier by rotating as the first displacement amplifying member rotates. And a second displacement amplifier member for amplifying the displacement further, and a coupler member for rotatably connecting the first displacement amplifier member and the second displacement amplifier member. The method of claim 18, The displacement expanding part rotates in contact with one side of the piezoelectric actuator to amplify the displacement of the piezoelectric actuator, and the first displacement amplifier to rotate in contact with the output end of the first displacement amplifying member. And a second displacement amplifier for further amplifying the amplified displacement.

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