KR100780237B1 - Device for lens transfer - Google Patents

Abstract

A lens transfer device is provided to have good transfer resolution and to minimize the loss of dynamic power, by obtaining large displacement with low input power. A lens barrel comprises a lens accommodation part(111) arranged with at least one lens and an extended part. An actuator has an output member(121) in a body part and provides external force to transfer the lens barrel, and the output member contacts with the extended part. At least one preload member maintains contact state between the output member and the lens barrel by pressing the actuator toward the lens barrel. A fixing part(140) supports the actuator horizontally. The fixing part comprises at least one supporting body, and the supporting body comprises a top body and a bottom body.

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.

Figure 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 overall perspective view of the lens transport apparatus according to the present invention.

5 is a perspective view illustrating a state in which the actuator is assembled as a fixing part to the lens transfer apparatus according to the present invention.

6 is an exploded perspective view of the lens transport apparatus according to the present invention.

7 is a state diagram in which the actuator is driven from the front of the lens transfer apparatus according to the present invention.

8 is a detailed view showing a contact state between the actuator and the extension provided in the lens transfer apparatus according to the present invention.

Figure 9 (a) (b) is a perspective view and a cross-sectional view showing a bearing member provided in the lens transfer apparatus according to the present invention.

10 is a view showing an actuator employed in the lens transfer apparatus according to the present invention,

(a) is a state in which the piezoelectric body is stretched and deformed in the longitudinal direction,

(b) is a state where the piezoelectric body is bent and deformed in the height direction,

(c) is the front view which synthesize | combined the elastic deformation and the bending deformation of the piezoelectric body.

11A and 11B are conceptual views illustrating internal and external electrodes of an actuator and a vibration mode according to the actuator employed in the lens transfer apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

100: lens transfer device 110: lens barrel

111: lens accommodating part 112: extension part

113: guide 119: reflector

120: actuator 121: output member

122: body portion 125: frictional member

130: preload member 131: free end

132: fixed end 133: embossed portion

140: fixing part 142: upper body

144: lower body 145: arrangement

150: upper case 160: lower base

161: bearing member 170: image sensor

The present invention relates to an apparatus for transferring a lens employed in an optical apparatus, and more particularly, to simplify the structure of the driving mechanism to achieve a compact design, to minimize the power loss consumed by driving the lens, and to more accurately transfer the lens. The present invention relates to a lens transfer apparatus that can be stably performed and can further improve driving characteristics by reducing a difference between a resonance frequency and a feedback frequency without degrading driving characteristics.

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 transferring a lens using a cam.

The US Patent 6,268, 970 is configured to convey 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. In this case, 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 into a linear movement, which has a problem in that the structure becomes complicated.

In addition, the lens conveying apparatus described above is difficult to miniaturize because it is provided with a plurality of reduction gears, and uses a motor of an electromagnetic method, which requires a lot of power, harmful electromagnetic waves to the human body, as well as low resolution for lens transport. have.

On the other hand, Figure 2 shows the zoom lens mechanism of the camera for transferring 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, a transfer lens group 28a is coupled to the lens barrel 28, and the barrel 28 is transferred in the optical axis direction by a guide shaft 29 coupled in the optical axis direction to the inside of the camera body 22. Combined to do that.

Therefore, when the motor 24 is operated, the guide screw 24a rotates, and as the guide screw 24a rotates, the power transmission member 26 moves in the optical axis direction. When the power transmission member 26 is moved in the optical axis direction, the barrel 28 is guided by the guide shaft 29 and is also moved 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 illustrate a driving device 30 of US Pat. No. 6,215,605 for transferring a lens using a piezoelectric element to solve the problems of the aforementioned 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.

Accordingly, the housing is provided with a lens holder having a lens and a guide pin for guiding the same in order to be mounted in a small volume, to have high resolution, and to control precisely, and to obtain sufficient displacement while operating with a small driving force. And a driving means for generating an external force on the lens holder by piezoelectric deformation when one end is fixed to the housing and the other end is in contact with the lens holder and the power is applied. Korean Patent Publication No. 2005-109647 (Nov. 24, 2005) Publication).

However, the structure for fixing the driving means in such a conventional lens transfer device has an image sensor attached to the lower surface of the housing because the housing is provided with a guide pin to which the lens holder is assembled and a driving means for providing piezoelectric driving force. The design must be made in consideration of the interference between the guide pins, which has limited the size of the device.

In addition, when a guide pin, a lens holder and a driving means are assembled on the upper surface of the housing, and foreign matter is generated during the image inspection of the image sensor while the image sensor is assembled on the lower surface of the housing, All the parts to be assembled must be discarded, which contributed to the increase of manufacturing cost.

The present invention is to solve the above-mentioned conventional problems, the object is to provide a lens transfer apparatus that can be miniaturized by simplifying the structure as compared to the conventional electromagnetic drive mechanism.

Another object of the present invention is to provide a lens transfer device that can obtain a large displacement even with a low input power compared to the prior art has excellent resolution of the transfer, and can minimize the loss of power required to drive.

Still another object of the present invention is to provide a lens transfer apparatus capable of improving driving characteristics by reducing a difference between a resonance frequency and a feedback frequency without degrading driving characteristics.

As a technical means for achieving the above object, the present invention is a lens barrel comprising a lens receiving portion is disposed at least one lens, and an extension extending outward from the outer surface; An actuator having an output member in contact with the extension part at the tip of the body part to provide an external force for conveying the lens barrel by being stretched and bent when the power is applied; At least one preload member for pressing the actuator toward the lens barrel to maintain a contact state between the output member and the lens barrel; And a fixing part having an upper end assembled to an upper case in which the lens barrel is disposed, and a lower end assembled to a lower base on which the image sensor is disposed, to horizontally support the actuator. It includes, the fixing portion is composed of at least one support, the support is assembled with the upper body is assembled with the upper assembly groove formed in the upper case, the lower assembly groove formed in the lower base and the body portion of the actuator is inserted It provides a lens conveying apparatus, characterized in that consisting of a lower body through-formed the arrangement to be disposed.

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More preferably, at least one bearing member is provided between the extension part and the upper case, and the bearing member is disposed between the guide groove formed on the guide surface of the extension part and the guide protrusion formed on the inner surface of the upper case.

More preferably, the extension part includes a vertical surface formed with a fixing groove so that the frictional member generating frictional force in contact with the output member is disposed, and a guide surface having a guide groove formed so that the bearing member is disposed.

More preferably, there is a guide hole between the lens receiving portion and the extension portion is assembled with a guide pin.

Preferably, the actuator is a piezoelectric ultrasonic motor having a plurality of piezoelectric layers and having two or more vibration regions through internal and external electrode structures.

Preferably, the preload member is provided with a leaf spring that one side free end is in contact with the rear end of the body portion, the other end is fixed to the upper case to elastically support the actuator to the extension side.

Preferably, the preload member is provided with a leaf spring that one side free end is in contact with the rear end of the body portion, the other fixed end is fixed to the lower base to support the actuator to the extension portion side.

More preferably, the preload member has an embossed portion in point contact with the rear end of the body portion at the free end.

More preferably, the preload member has a fixed end bent toward the lens barrel side.

Preferably, the fixing portion is composed of a rubber material.

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More preferably, the placement portion is provided in the same cross section as the body portion of the actuator.

More preferably, the placement portion overlaps with the nodal point of the actuator.

Preferably, the upper case includes a sensor fixing part having a position sensor on an upper surface thereof, and a reflecting portion detected by the position sensor on one side of the lens barrel.

More preferably, the position sensor and the reflector are disposed on the same vertical axis.

Preferably, the upper case is provided with a shield can on the outer surface to prevent the external radiation of harmful electromagnetic waves generated during the operation of the actuator.

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

Figure 4 is a perspective view of the entire lens transfer apparatus according to the present invention, Figure 5 is a perspective view showing a state of assembling the actuator to the lens transfer apparatus according to the present invention, Figure 5 is a lens transfer apparatus according to the present invention 7 is an exploded perspective view of a state in which the actuator is driven from the front of the lens transfer apparatus according to the present invention.

As shown in FIGS. 4 to 7, the lens transfer device 100 according to the present invention may improve driving characteristics by reducing a difference between a resonance frequency and a feedback frequency without reducing vibration generated during driving. It is configured to include a lens barrel 110, the actuator 120, the preload member 130 and the fixing part 140.

The lens barrel 110 is an injection molded product including a lens accommodating part 111 and an extension part 112, and the lens accommodating part 111 has a predetermined size so that at least one lens L is arranged along an optical axis. It is a hollow-cylindrical receptor with space.

The extension part 112 is a structure extending a predetermined length toward the output member 121 to contact the output member 121 of the actuator 120 from the outer surface of the lens receiving portion 111.

The extension part 112 is a vertical groove (112a) formed with a fixing groove so that the friction member 125 to generate friction force in contact with the output member 121 and the guide groove so that the bearing member 161 is disposed It is provided with the guide surface 112b which formed this.

In the boundary region between the lens accommodating part 111 and the extension part 112, a guide hole 113 coupled to the guide pin 152 having an upper end fixed to the upper case 150 to be described later is formed.

Here, the vertical surface (112a) is provided on one side of the extension portion 112 facing the output member 121 of the actuator 120, the guide surface (112b) of the opposite side of the extension portion 112 It is provided on the other side.

On the other hand, the extension portion 112 of the lens barrel 110 may be provided integrally with the lens receiving portion 111 during the injection molding of the lens barrel 110, but is not limited thereto, and the hollow-cylindrical cylinder that is injection-molded It may be separately injection molded to have a structure that is assembled and coupled to the lens receiving portion 111 of the image.

Through the opening 151 of the upper case 150 and the upper surface of the lens receiving portion 111 corresponding to the through hole formed in a predetermined size through the incident hole coinciding with the optical axis and the center of the lens (L).

The actuator 120 is a piezoelectric ultrasonic motor having a rectangular parallelepiped consisting of an output member 121 and a body portion 122 provided at the tip thereof.

The output member 121 has a body portion such that one side of the extension part 112 extending from the lens barrel 110 is in contact with the vertical surface 112a to be in contact with the frictional member 125 provided thereto. It is provided in the front-end | tip of 122.

The output member 121 is preferably made of a ceramic or metal material having excellent wear resistance and a relatively high coefficient of friction. The shape of the output member 121 is not limited to a cylindrical shape as illustrated, and transmits a friction force to a counterpart such as a semicircle or a cube. It may be composed of a friction member having a shape capable of.

 The body portion 122 has a plurality of electrode terminals provided on the outer surface electrically connected to an external power source via a power cable, and the elastic deformation mode and the thickness direction of the longitudinal direction by the power applied through the electrode terminal A plurality of piezoelectric elements in which a plurality of piezoelectric bodies having specific internal electrodes are stacked therein so that a bending deformation mode may be synthesized and excited.

8 is a detailed view illustrating a contact state between an actuator and an extension part provided in the lens transfer device according to the present invention. As illustrated, the output member 121 and the extension part 112 of the actuator 120 are shown. The frictional member 125 provided in contact with each other while crossing at right angles to each other, the frictional member 125 is provided perpendicular to the vertical surface (112a) of the extension (112).

Like the output member 121, the frictional member 125 is preferably made of a material such as ceramic or metal having excellent abrasion resistance and a relatively large coefficient of friction, and the shape is limited to a cylinder as illustrated. If it is a shape that can receive the frictional force of the opponent, such as semi-circular, hexahedral shape can be used as the friction member 135.

In the vertical surface 112a of the extension part 112 facing the output member 121, a recess on a semi-circular cross section may be recessed so as to more firmly fix the friction member 125 disposed thereon.

The output member 121 and the frictional member 125 are separately jig (not shown) to be fixed to the front end 112 of the body portion 122 and the extension portion 112 of the actuator 120, respectively. Determine the mounting position while applying a constant preload by using, and then apply a thermosetting resin adhesive in a pressurized state to be mounted on the body portion 122 and the vertical surface (112a), respectively.

In addition, at least one bearing member 161 is provided between the extension part 112 and the upper case 150, and the bearing member 161 is recessed in the guide surface 112b of the extension part 112. It is disposed between the guide groove 115 and the guide protrusion 155 protruding from the vertical inner surface of the upper case 150.

Accordingly, when the lens barrel 110 is driven by the driving force provided therefrom during the operation of the actuator 120, the guide pin 152 and the bearing member 161 of the guide pin 152 are assembled. By the guiding action, the guiding operation in the optical axis direction can be more stably performed.

The bearing member 161 disposed between the guide surface 112a of the extension part 112 and the guide protrusion 155 of the upper case 150 is as shown in FIG. 9 (a) (b). A plurality of left and right pairs of ball members 161a contacting the outer surface of the groove 115 and the outer surface of the guide protrusion 155 and a plurality of ball receiving grooves 161b in which the ball members 161a are rotatably disposed. It is comprised by the retainer 161c provided.

The recesses 161d and 161e are recessed to prevent contact between the protrusions formed between the guide grooves 115 provided in a pair of left and right on the front and rear surfaces of the retainer 161c and the guide protrusion 155. Form.

Here, the left and right pair of ball members 161a and the guide protrusions 155 are disposed at positions corresponding to the vertices of the triangle so as to stably contact each other on the plane and prevent the twist.

In addition, the center of the guide protrusion 155 is located on the same virtual horizontal axis as the contact position where the output member 121 of the actuator 120 and the frictional member 125 of the extension part 112 are in contact with each other. Preferably, the contact point at which the output member 121 and the frictional member 125 contact each other is the same as the contact point at which the free end 131 of the preload member 130 and the actuator 120 contact each other. It is preferably arranged on the horizontal axis.

Accordingly, the driving force provided therefrom during the operation of the actuator 120 is transferred to the frictional member 125 through the output member 121 without loss of power, thereby reciprocating the lens barrel 110 in the optical axis direction. It acts as an external force to minimize unnecessary power loss during round trip.

As shown in FIGS. 4 and 6, the preload member 130 has one free end at a rear end of the body portion 122 of the actuator 120 corresponding to the opposite side of the tip provided with the output member 121. 131 is in contact with the other fixing end 132 is assembled in a fixing groove (not shown) of the upper case 150 so as to press the actuator 120 to the extension portion 112 with a certain strength of the elastic force. It is an elastic body in the form of a leaf spring.

A fixed end (not shown) of the preload member 130 may be fitted into a fixing groove provided on the upper surface of the lower base 160 to be fixed.

 Fixing grooves selectively formed in the upper case 150 or the lower base 160 are integrally provided therein when injection molding the upper case 150 or the lower base 160.

One side of the free end 131 of the preload member 130 is in contact with the rear end of the body portion 122 of the actuator 120 to project the embossed portion 133 so as to concentrate and transmit the elastic force to the actuator 120 side. do.

The other fixed end 142 of the preload member 130 is bent at an angle to the lens barrel 110 to increase the elastic force of the preload member 130 to the upper case 150 or the lower base 160. It is preferable to be disposed and fixed at the edge of the).

At this time, the preload member 130 provided in the form of a leaf spring is preferably provided longer than the length of the actuator 130 to obtain an adjustable preload in design.

The upper case 150 corresponding to the lower base 160 is formed of a rectangular parallelepiped box structure through which an opening 151 of a predetermined size is formed in the central region of the upper surface and opened downward.

The upper case 150 includes at least one guide pin 152 coupled to the guide hole 113 of the lens barrel 110 to guide the lens barrel 110 in the optical axis direction. The upper end of the guide pin 152 is fitted into the pin holder 153 formed on the inner surface of the upper case 150 while being fixed, while the lower end is provided as a free end.

In addition, the lower base 160 is assembled as the upper case 150 and the at least one fastening member 165 or bonded and bonded together as a bonding agent, so that the lens barrel and the actuator are disposed therebetween. It is a structure that provides space.

An image sensor 170 is disposed on a lower surface of the lower base 160, and an opening 163 through which an image forming area of the image sensor 170 is disposed is formed in a central region of the upper surface of the lower base 160. do.

On the other hand, the fixing part 140 is between the upper case 150 and the lower base 160 to horizontally support the actuator 130 that provides a driving force for transferring the lens barrel 110 in the optical axis direction when the power is applied. At the top and bottom will be assembled respectively.

The fixing part 140 is preferably made of a rubber material excellent in elastic deformation and return force by the external force.

The fixing part 140 is composed of at least one support to support the actuator 120, the support is the upper body 142 is assembled with the upper assembly groove 158 formed in the upper case 150 ) And a lower body 144 that is assembled with a lower assembly groove 168 formed in the lower base 160 and penetrates an arrangement portion 145 into which the body portion 122 of the actuator 120 is inserted. It is configured to include.

The lower body 144 extends a predetermined length directly from the lower surface of the upper body 142 to a lower end so that the lower end is in contact with the lower assembly groove 168 of the lower base 160.

In addition, the arrangement portion 145 into which the body portion 122 of the actuator 120 is inserted and disposed is provided as a through hole into which the body portion 122 is inserted.

Accordingly, the outer surface of the body portion 122 is supported in interview with the inner surface of the placement portion 145.

In addition, the placement unit 145 overlaps with a nodal point formed on the body portion 122 so as to minimize the external force transmitted to the fixed portion during the piezoelectric drive of the actuator 120.

That is, such a nodal point is a portion in which the piezoelectric bulb of the actuator 120 has no vibration, so that the placement unit 145 corresponds to the nodal point of the actuator 120 to support the actuator without disturbing the vibration of the actuator. It is preferable to be arranged.

In addition, the outer surface of the upper case 150 is provided with a shield can 180 to prevent harmful electromagnetic waves generated during operation of the actuator 120 fixed to the fixing part 140 to the outside.

The shield can 180 penetrates through the upper surface the assembly hole 181 that is elastically inserted into the first assembly jaw 159 formed in the upper case 150, the second assembly jaw (formed in the lower base ( Another assembly hole 182 elastically inserted into the 169 is a metal plate formed through the vertical surface.

In addition, one side surface of the lens barrel 110 is provided with a reflecting portion 119 extending to the outside, the upper portion of the reflecting portion 119 is conveyed in the vertical direction during the operation of the actuator 120 In order to detect a change in the position of the lens barrel 110, a position sensor 190 is detected to detect a conveyance distance of the lens barrel by detecting a moving position of the reflector 119.

The position sensor 190 is fixed to the sensor fixing portion 154 formed on the upper surface of the upper case 150 corresponding to the reflection portion 119 in a vertical direction, the power is applied to one side, the signal Is provided with a plurality of terminals to be transmitted and received.

The position sensor 190 and the reflector 119 provided in the sensor fixing part 154 should be positioned on the same vertical axis.

In the process of assembling the lens transfer device 100 having the above configuration, the upper end of the guide pin 152 having a predetermined length is the pin of the upper case 150 in a state in which the opened upper end of the upper case 150 is lowered. Insert into the holder 153 and fix it.

The preload member 130 is fixed to the fixing end 132 in the fixing groove formed in the inner surface of the upper case 150, the free end 131 is located in the space in which the actuator 120 is disposed.

The upper case 150 in which the guide pin 152 and the preload member 130 are assembled includes a lens barrel 110 including a lens accommodating portion 111 and an extension portion 112, and the lens barrel ( By combining the guide hole 113 formed in the 110 and the guide pin 152, along the guide pin 152, the upper end of which is fixed to the upper case 150, the lens barrel 110 assembled thereon may be sent to the shanghai. It is.

The frictional member 125 is mounted on the vertical surface 112a of the extension 112 of the lens barrel 110 so as to face and face the output member 121 of the actuator 120.

Subsequently, the operation of assembling the actuator 120 including the output member 121 and the body portion 122 to the upper case 150 in which the lens barrel 110 is assembled is a lower body constituting the fixing portion 140. The actuator 120 is inserted into the placement portion 145 of 144 to fix the position by inserting the body portion 122 of the actuator 120 into the placement portion 145. At this time, since the fixing part 140 including the upper and lower bodies 142 and 144 is made of a rubber material, the operation of inserting the body part 122 of the actuator 120 into the placement part 145 is performed. It can be done smoothly.

Subsequently, the upper body 142 integrally provided at the upper end of the lower body 144 is assembled by pushing the upper assembly groove 158 formed in the upper case 150 in a horizontal direction, and the lower body 144. The lower end of the lower base 160 is inserted into the lower assembly groove 168 is disposed.

In this case, the body portion 122 of the actuator 120 is fitted to the placement portion of the fixing portion 140 is assembled to the upper case 150 in a cantilever form, the top end of the body portion 122 The output member 121 provided in contact with the friction member 125 provided on the vertical surface of the extension portion 112 at right angles.

At the same time, the rear end of the body portion 122 comes into contact with the free end 131 of the preload member 130 that is already assembled in the upper case 150, thereby pressing the actuator 120 toward the extension portion 112. Thus, the preloaded state between the output member 121 and the frictional member 125 is maintained.

Subsequently, the lower base 160 is fitted into the opened lower portion of the upper case 150 to be pre-assembled with the upper case 150 in an inner space between the upper case 150 and the lower base 160. The lens barrel 110 and the actuator 120 are disposed.

When the assembly between the upper case 150 and the lower base 150 is completed, a part of the actuator 120 and the preload member 130 are externally opened through a cutout opened in the outer surface of the upper case 150. Since it is exposed to, assembling the shield can 180 to protect these parts and to prevent harmful electromagnetic waves generated during the operation of the actuator 120 to the outside.

In addition, when the assembling of the shield can 180 is completed, the lower base (through the screw hole of the upper case 150) can be more firmly coupled between the upper case 150 and the lower base 160. At least one fastening member 165 assembled on the screw is screwed.

In addition, the sensor fixing part 154 formed on the upper surface of the upper case 150 is assembled with a position sensor 190 for detecting the position of the reflector 119 extending outward from the lens barrel 110. Accordingly, the transfer distance can be detected by detecting a change in the position of the lens barrel 110 which is transferred in the vertical direction when the actuator 120 is operated.

Subsequently, the lower surface of the lower base 160 is assembled with an image sensor 170 including an IR filter 171 on an upper surface having an imaging area and a connector 172 connected to a main substrate (not shown). By doing so, the lens transfer device 100 is manufactured.

In the lens transfer apparatus 100 of the present invention, the operation of reciprocating the lens barrel 110 in which the at least one lens is built in the optical axis direction is performed through a power cable connected to the body portion 122 of the actuator 120. By applying power, the driving force for transferring the lens barrel 110 is generated by the length and bending deformation of the body portion 122 in which the piezoelectric body is laminated.

That is, the actuator 120 has the body portion 122 such that the adjacent length deformation mode and the bending deformation mode are simultaneously excited at the resonance frequency of the ultrasonic region of 20 kHz or more as shown in FIGS. 9 (a) (b) (c). An elliptical trajectory is generated from the output member 121 attached to one end.

The direction of movement of the elliptical trajectory is determined in accordance with the excitation area determined by the external electrode in the body portion 122, thereby changing the conveying direction of the lens. The conceptual diagram of the internal and external electrodes and thus the vibration mode is shown in FIGS.

That is, when the power is selectively applied through the channel 1 or the channel 2, the body portion 122 stacked in a multi-layer is formed at the same time as the length deformation mode and the bending deformation mode, and the output member 121 provided at one end thereof is upward or downward. It will be a linear motion.

At this time, the vibration direction of the bending deformation mode is the same as the stacking direction of the body portion 122, which corresponds to the optical axis direction of the AF module provided in the present invention. In the present invention, a resonant frequency of about 300 kHz is used, which can be changed depending on the length, width, and thickness of the actuator.

Here, the body portion 122 of the actuator 120 in which the length deformation mode and the bending deformation mode are synthesized by the resonance frequency applied through the channel is made of a rubber material, and thus the lower body of the fixing part 140 which is easily elastically deformed ( Since it is fixed to 144, it is possible to reduce the difference between the resonant frequency and the feedback frequency without reducing the vibration generated during the operation of the actuator 120.

In addition, since the output member 121 is allowed only up and down linear movement, the direction of the vibration trajectory is switched up or down according to the electrode of the voltage applied to the body portion 122.

Therefore, the output member 121 forming only the vibration trajectory in the vertical direction transmits the driving force through the frictional member 125 provided in the extension part 112 of the lens barrel 110 which is the object to be transferred. The lens barrel 110 is raised or lowered in the optical axis direction along the guide pin 152.

The frictional force generated between the output member 121 and the frictional member 125 is disposed between the frictional force between the guide pin 152 and the guide hole 113 and between the extension 112 and the upper case 150. Since the friction force of the bearing member 161 is greater, the shanghai song of the lens barrel 110 may be stably achieved.

In addition, the contact state in which the output member 121 and the frictional member 125 are in contact with each other is always due to the elastic force of the preload member 130 provided to elastically press the actuator 120 toward the extension portion 112 side. Stays constant.

In addition, since the contact point where the output member 121 and the frictional member 125 contact each other is located on the same horizontal line as the center of the guide protrusion 155 contacting the bearing member 161, the contact portion 112 is located toward the extension 112. The elastic force of the preload member 130 is applied to the extension portion 112 without loss to maximize the performance of the actuator 120.

Meanwhile, the shanghai song of the lens barrel 110 by the driving force provided by the actuator 120 may include a guide pin 152 assembled to the upper case 150, a guide surface 112b of the extension part 112, and the like. It is made by a bearing member 161 provided between the guide protrusion 155 of the upper case 150.

In addition, the position of the reflective portion 119 protruding from the outer surface of the lens barrel 110 is the distance of the conveying distance of the lens barrel 110 which is conveyed along the guide pin 152 and the bearing member 161. The external force that causes the lens barrel 110 to be moved by the driving force of the actuator 120 is appropriately controlled by the sensor 190 based on the detected quantity of shanghai.

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.

According to the present invention as described above, the rubber part is provided with an actuator which is in point contact with the extension part extending in the radial direction from the lens barrel and pressed by the preload member toward the extension part, and the fixing part for supporting the actuator with a cantilever on the upper case. In addition, since the linear driving mechanism that transmits the driving force of the actuator to the lens barrel side can be reduced, the difference between the resonant frequency and the feedback frequency can be reduced without reducing the vibration when the actuator is driven. Compared with the driving mechanism, the structure can be simplified to make the optical device more compact, and the driving characteristics of the device can be improved.

In addition, since the piezoelectric linear driving mechanism minimizes the loss of the driving force transmitted to the lens barrel, which is the object to be conveyed, the loss due to the frictional force during the transfer can be obtained, and thus a large displacement can be obtained even at a low input power compared to the conventional technology. An effect that can increase driving efficiency is obtained.

Claims (17)

A lens barrel having a lens receiving portion in which at least one lens is disposed, and an extension portion extending outwardly from the outer surface thereof; An actuator having an output member in contact with the extension part at the tip of the body part to provide an external force for conveying the lens barrel by being stretched and bent when the power is applied; At least one preload member for pressing the actuator toward the lens barrel to maintain a contact state between the output member and the lens barrel; And An upper part of the upper case in which the lens barrel is disposed, and a lower part of the lower base in which the image sensor is disposed, the fixing part supporting the actuator horizontally; Including, The fixing part is composed of at least one support, the support is an upper body to be assembled with the upper assembly groove formed in the upper case, the lower assembly groove formed in the lower base and the arrangement portion in which the body portion of the actuator is inserted Lens conveying device, characterized in that consisting of the lower body formed through. delete The method of claim 1, At least one bearing member is provided between the extension part and the upper case, and the bearing member is disposed between the guide groove formed on the guide surface of the extension part and the guide protrusion formed on the inner surface of the upper case. Device. The method of claim 1, The extension part has a vertical surface formed with a fixing groove so that the frictional member generating friction force in contact with the output member is disposed, and a guide surface formed with a guide groove so that the bearing member is disposed, respectively. The method of claim 1, Lens transport apparatus characterized in that it comprises a guide hole for guiding the pin is assembled between the lens receiving portion and the extension. The method of claim 1, The actuator is a piezoelectric ultrasonic motor (piezoelectric ultrasonic motor) characterized in that a plurality of piezoelectric laminated and having two or more vibration regions through the internal and external electrode structure. The method of claim 1, The preload member is a lens conveying apparatus, characterized in that the free end is in contact with the rear end of the body portion, the other end is fixed to the upper case is provided with a leaf spring to elastically support the actuator to the extension side. The method of claim 1, The preload member is a lens transfer device, characterized in that the free end is in contact with the rear end of the body portion, the other fixed end is fixed to the lower base is provided with a leaf spring to support the actuator to the extension side. The method of claim 8, The preload member is a lens transfer apparatus characterized in that the free end has an embossed portion in point contact with the rear end of the body portion. The method of claim 8, The preload member is a lens transfer apparatus, characterized in that the fixed end is bent to the lens barrel side. The method of claim 1, Lens fixing device characterized in that the fixing portion is composed of a rubber material. delete The method of claim 1, The disposition unit is a lens transfer apparatus, characterized in that provided on the same cross-section and the body portion of the actuator. The method of claim 1, And the disposition unit overlaps the nodal point of the actuator. The method of claim 1, The upper case has a sensor fixing portion having a position sensor on the upper surface, and the lens conveying apparatus, characterized in that on one side of the lens barrel is provided with a reflecting portion detected by the position sensor. The method of claim 15, And the position sensor and the reflector are disposed on the same vertical axis. The method of claim 1, The upper case is a lens transfer device, characterized in that the outer surface is provided with a shield can to prevent the external radiation of harmful electromagnetic waves generated during operation of the actuator.

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