KR100649756B1 - Device for lens transfer - Google Patents

Abstract

Provide a lens transfer device.

The present invention provides a lens barrel comprising at least one lens; An actuator having a body portion generating a driving force when power is applied, and an output member outputting a driving force to one end of the body portion; A preload member which contacts one end of the free elastic end to the other end of the body to provide an elastic force to press the actuator toward the output member; A reciprocating member having a square cross section in contact with one side of the output member and connected to the lens barrel and reciprocating in an optical axis direction by a driving force of the actuator; And a guide part which is rolled around the other side of the reciprocating member so as to guide the linear movement of the reciprocating member.

According to the present invention, it is possible to obtain a high lens transfer speed and a large lens transfer driving force with a low input power by minimizing frictional force during lens transfer to improve driving efficiency and minimizing power transmission loss.

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.

FIG. 5 is a front view as seen in direction A of FIG. 4.

FIG. 6 is a front view as viewed in the direction B of FIG. 4.

7 is a state diagram showing the operation of the guide shaft in the lens transfer apparatus according to the present invention.

Explanation of symbols on the main parts of the drawings

110: lens barrel 115: barrel frame

116: actuator frame 117: guide frame

120: actuator 121: body

122: output member 130: preload member

131: free elastic end 133: elastic piece

135: fixed end 140: reciprocating member

150: guide portion 151: roller

152: roller shaft 153: guide roller

The present invention relates to a device for transferring a lens that is employed in the optical mechanism, and more particularly, to improve the driving efficiency by minimizing the friction force during lens transfer, and to minimize the power transmission loss, fast lens transfer speed and large The present invention relates to a lens transfer device that can obtain a lens transfer displacement, and to improve the miniaturization of an optical device by simplifying a guide mechanism.

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 device 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.

In addition, due to the sliding friction generated between the driving round bar 36 and the slide portion 36a during the transfer of the lenses L1, L2, L3, and L4, the driving efficiency is greatly reduced, and the power loss is not only very large, but also the driving. There was a drawback that the characteristics of excessive wear of the round bar 36 and the slide portion 36a may change.

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 conventional problems as described above, the object is to minimize the frictional force during lens transfer to improve the driving efficiency, to minimize the power transmission loss fast lens feed speed and large lens transfer displacement with low input power In order to provide a lens transfer device capable of miniaturizing the optical device by simplifying the guide mechanism.

The present invention to achieve the above object,

A lens barrel including at least one lens;

An actuator having a body portion generating a driving force when power is applied, and an output member outputting a driving force to one end of the body portion;

A preload member which contacts one end of the free elastic end to the other end of the body to provide an elastic force to press the actuator toward the output member;

A reciprocating member having a square cross section in contact with one side of the output member and connected to the lens barrel and reciprocating in an optical axis direction by a driving force of the actuator; And

It provides a lens conveying apparatus comprising a; guide portion to be rotated in the outer rotation with the other side surface of the reciprocating member to guide the linear movement of the reciprocating member.

Preferably, the actuator is a piezoelectric utlasonic motor having a rectangular parallelepiped body portion in which a plurality of piezoelectric bodies are laminated.

Preferably, the output member is a friction member made of alumina.

Preferably, the preload member extends from a free elastic end bent at right angles to contact the rear end of the actuator, an elastic piece extending in the longitudinal direction of the actuator from an upper end of the free elastic carbon, and a tip of the elastic piece. The actuator is provided with a fixed end bent to be assembled on one side of the actuator frame is disposed.

More preferably, the free elastic end is provided to be curved toward the rear end side of the actuator so that the center of the length is in partial contact with the body portion of the actuator.

More preferably, the elastic piece is provided to be curved toward the upper surface side of the actuator so that the center of the length is in partial contact with the body portion of the actuator.

Preferably, the preload member is provided longer than the length of the actuator.

Preferably, the guide portion comprises a guide roller having a roller that is external to the other side surface of the reciprocating member, and a roller shaft assembled to the center of the roller.

More preferably, the guide roller is provided with at least two or more at regular intervals parallel to the optical axis.

Preferably, the guide portion includes a bearing that is external to the other side of the reciprocating member.

More preferably, the bearing is provided with at least two at regular intervals parallel to the optical axis.

Preferably, the lens barrel further comprises a barrel frame having an inner diameter that is assembled to guide the movement in the optical axis direction, the actuator is in the pressing direction provided by the preload member only in the actuator frame extending from one side of the barrel frame Arranged to be movable, the reciprocating member is assembled to be transportable to the guide frame extending from one side of the barrel frame.

More preferably, the preload member is assembled such that a fixed end is fixed to one side of the actuator frame.

More preferably, the guide frame is provided integrally with the actuator frame.

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

4 is an overall perspective view of the lens transport apparatus according to the present invention, FIG. 5 is a front view as viewed from the direction A of FIG. 4, FIG. 6 is a front view as viewed from the direction B of FIG. 4, and FIG. 7 is according to the present invention. This is a state diagram showing the operation of the guide shaft in the lens feeder.

4 to 7, the lens conveying apparatus 100 of the present invention includes at least one lens barrel 110 in which at least one lens is accommodated therein, an actuator 120 providing a driving force for transferring the lens barrel, and the actuator. It includes a preload member 130 for pressing the 120 to one side, a reciprocating member 140 extending from the lens barrel 110 and a guide portion 150 for guiding the transfer of the reciprocating member 140. .

That is, the lens barrel 110 is a receptor having a predetermined size of internal space such that at least one lens (not shown) is arranged along the optical axis, as shown in FIGS. 4 and 5.

The lens barrel 110 is assembled to move in the optical axis direction to the inner diameter portion 112 of the barrel frame 115 is disposed to be fixed on the fixed base 190.

 On the upper surface of the lens barrel 110, an incident hole 113 coinciding with the optical axis is formed through a predetermined size.

In addition, the actuator 120 is a piezoelectric ultrasonic motor (piezoelectric utlasonic motor) consisting of a body portion 121 and the output member 122, as shown in Figure 7, the body portion 121 is an outer surface A plurality of electrode terminals (not shown) to which an external power source is applied are provided, and a plurality of piezoelectric elements are stacked to be stretched in the longitudinal direction and bent in the vertical direction by a power source applied through the electrode terminal.

The output member 122 is a cylindrical friction member integrally mounted to the front end of the body portion 121 to be in contact with one side of the reciprocating member 140, it is preferably made of alumina of ceramic material.

The actuator 120 is assembled to the actuator frame 116 provided on one side of the barrel frame 115, the actuator frame 116 may be provided integrally with the barrel frame 115, but is not limited thereto. It may be provided as a separate member to be fixed on the fixed base 190.

Here, the actuator frame 116 has a bottom surface in contact with the bottom surface of the body portion 121 and the left and right sides of the body portion 121 so that the body portion 121 on the rectangular parallelepiped is disposed from the top. It should be provided to have left and right sides in contact.

The actuator 120 should be disposed on the actuator frame 116 so as to be movable only in the pressing direction.

As shown in FIG. 7, the output member 122 may be provided in a semicircular cross section or an elliptical cross section to form point contact with one side of the reciprocating member 140, but is not limited thereto. It may be provided in a variety of cross-section to form a surface contact.

In addition, the preload member 130 has a free elastic end 131 in contact with a rear end (right side in the drawing) of the body portion 121 of the actuator 120 as shown in FIGS. 4, 6, and 7. It is a spring member that provides an elastic force so that the contact pressure is generated at the contact portion between the output member 122 and the reciprocating member 140 by pressing the portion 121 to the output member 122 at a predetermined strength.

The preload member 130 is assembled with the other side fixing end 135 to the actuator frame 116 is arranged and fixed to the actuator 120.

Accordingly, the preload member 130 extends in the longitudinal direction of the actuator 120 from the upper end of the free elastic end 131 and the free elastic end is bent at right angles to contact the rear end of the actuator 120. The elastic piece 133 is extended from the front end of the elastic piece 133 is provided with a fixed end 135 is bent to be assembled on one side of the actuator frame 116 is fixedly arranged is an elastic force It is preferable to be provided with a leaf spring to provide.

Here, the free elastic end 131 is provided to be curved toward the rear end side of the actuator 120 so that the center of the length is in partial contact with the body portion 121 of the actuator 120, the elastic piece 133 also It is preferable that the center of the length is bent to the upper surface side of the actuator 120 to be in partial contact with the body portion 121 of the actuator 120.

The fixed end 135 has a structure that is inserted into the fixing groove 116a formed on one side of the actuator frame 116 to be fixed.

The preload member 130 is preferably provided longer than the length of the actuator 120 to obtain a suitable preload pressure that can be adjusted in the design.

In addition, the reciprocating member 140 has one side surface corresponding to the actuator 120 in contact with the output member 122 and is connected to the lens barrel 110 to drive the output member (120) when the actuator 120 is driven. 122 is a predetermined length of operation member reciprocated in the optical axis direction by the vibration having an elliptical trajectory transmitted from.

The reciprocating member 140 is vertically assembled to contact the inner wall surface of the guide frame 117 extending from the barrel frame 115 to which the lens barrel 110 is assembled, and is vertically assembled so that it is difficult to rotate during the transport. It is preferably provided with a square bar having a predetermined length.

Here, the reciprocating member 140 in contact with the guide roller 153 of the guide portion 150 is shown as being provided in a rectangular cross-section so that it is difficult to rotate during the up and down reciprocating motion as shown in FIG. 4, but is not limited thereto. It may also be provided on a polygonal cross section of more than five angles, the shape of the guide frame 117 to be modified according to the cross-sectional shape of the reciprocating member (140).

The guide frame 117 is a part of the front surface corresponding to the output member 122 is opened so that there is no interference between the contact between the reciprocating member 140 and the output member 122 and the rotation of the elliptical trajectory, the reciprocating member ( It is a vertical frame on the square hole cross-section having a left and right inner wall surface to contact the left and right both sides of the 140, it is provided integrally with the actuator frame 116 is disposed the actuator 120. .

In addition, the guide unit 150 receives the elliptical rotational force driving force from the actuator 120 and the reciprocating member which the output member 122 is in contact with the output member 122 to guide the reciprocating member 140 for converting the linear movement thereof in the optical axis direction ( One side of the 140 is rolling in contact with the other side corresponding to the opposite side.

The guide part 150 includes a guide roller 153 having a roller 151 external to the other side surface of the reciprocating member 140 and a roller shaft 152 assembled at the center of the roller 151. At least two guide rollers 153 are provided, and the left and right ends of the roller shaft 152 penetrate the left and right inner wall surfaces of the guide frame 117 to which the reciprocating member 140 is reciprocally assembled. It is rotatably assembled to the shaft hole formed.

At least two guide rollers 153 provided in the guide frame 117 may be disposed at a predetermined interval on a virtual vertical axis parallel to the optical axis direction.

Here, the guide part 150 is shown to be limited to the guide roller 153, but is not limited thereto, and may be a bearing for rolling guide the outer surface and the outer surface of the reciprocating member 140.

In addition, the lens transfer apparatus 100 of the present invention includes a barrel frame 115 assembled with the lens barrel 110 as shown in FIGS. 4 to 7, and has a substrate 180 having an image sensor (not shown). ) Includes a fixed base 180 assembled to the lower surface.

Here, the fixed base 180 is a barrel frame 115 to which the lens barrel 110 is assembled, an actuator frame 116 to which the actuator 120 is assembled, and a guide frame provided with the guide part 150. It is a resin structure for injection molding (117).

In addition, the upper portion of the fixing base 190, the case (so that the lens barrel 110, the actuator 120, the preload member 130, the reciprocating member 140 and the guide portion 150 to protect from the external environment) Not shown).

Such a case is a cover member assembled to an outer edge of the fixed base 190 by forming a through-opening opening (not shown) for exposing the entrance hole 113 of the lens barrel 110 to the upper surface to a predetermined size.

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 an electrode terminal formed in the body portion 121 of the actuator 120. By applying power, the driving force for transferring the lens barrel 110 is generated by the deformation of the body portion 121 in which the piezoelectric body is laminated.

When the actuator 120 has a voltage of about 222 kHz at a resonant frequency band applied to the body portion 121, as shown in FIG. 8A, the body portion 121 has a length along with the output member 122. Direction is stretched in the direction, when the voltage of the resonant frequency band of about 224kHz is applied to the body portion 121, as shown in Figure 8 (b), the body portion 121 is 'S' shaped bending deformation do.

Accordingly, when the voltage of the resonant frequency band of approximately 223 kHz corresponding to the two resonant frequencies is applied to the body portion 121, the body portion 121 is the elastic deformation vibration mode in the longitudinal direction and the bending deformation vibration in the height direction Since the mode is generated at the same time, the output member 122 mounted at the front end of the body portion 121 as shown in Figure 8 (c) by the elastic deformation and bending deformation by the combination of the body portion 121 When viewed from the side to form a vibration trajectory to the elliptic motion, and when looking at the body portion 121 from the front to form a vibration trajectory to perform a linear movement.

In addition, the direction of the elliptic vibration trajectory of the output member 122 is switched in the forward or reverse direction according to the electrode of the voltage applied to the body portion 121.

In this case, the rotational driving force of the output member 122 drawing the elliptical oscillation trajectory when the actuator 120 is driven is transmitted to the reciprocating member 140 in contact with the tip of the output member 122, and the reciprocating member 140. The friction force is generated at the contact portion where the output member 122 contacts each other.

Subsequently, the driving force provided by the actuator 120 is transmitted to the reciprocating member 140 through the output member 122, by the reciprocating member 140 assembled to be guided to the guide frame 117. The vertical movement is converted to vertical movement parallel to the optical axis direction along with the lens barrel (110).

As the reciprocating member 140 is circumscribed with the guide roller 153 rotatably provided at the guide frame 117, the shanghai conveyance of the reciprocating member 140 is at least reduced by the rolling of the guide roller 153. The lens barrel 110 is connected to the reciprocating member 140 while generating a frictional force, and is sent to the optical axis direction from the inner diameter 112 of the barrel frame 115.

In this case, the friction force generated between the output member 122 and the reciprocating member 1140 as a driving force for transporting the lens barrel 110 may smoothly perform the shanghai conveying of the lens barrel 110. The friction force generated between the barrel 110 and the inner diameter of the barrel frame 115 and the friction force generated between the reciprocating member 140 and the guide roller 150 should be greater than the sum.

In addition, the outer diameter portion of the lens barrel 110 and the inner diameter portion of the barrel frame 115 should be designed to minimize the friction force generated between them, the reciprocating member 140 and the guide roller 150 They should also be designed to minimize the frictional forces generated between them.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that the present invention may be modified and modified in various ways 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, by guiding the linear motion of the reciprocating member to be transported by the driving force provided by the actuator by having a guide portion consisting of a guide roller or a bearing rotated outside the reciprocating member, when the reciprocating member Since the friction force generated can be minimized, the driving efficiency of the actuator can be improved, and the service life can be extended by minimizing the power loss that can be generated during power transmission.

In addition, even when the actuator is driven at a lower input power than in the related art, a faster lens transfer speed and a larger lens transfer displacement can be obtained.

In addition, the guide mechanism for guiding the lens barrel is simplified compared with the prior art, and the effect of miniaturizing the optical apparatus is obtained.

Claims (14)

A lens barrel including at least one lens; An actuator having a body portion generating a driving force when power is applied, and an output member outputting a driving force to one end of the body portion; A preload member which contacts one end of the free elastic end to the other end of the body to provide an elastic force to press the actuator toward the output member; A reciprocating member having a square cross section in contact with one side of the output member and connected to the lens barrel and reciprocating in an optical axis direction by a driving force of the actuator; And And a guide part which is rolled around the other side of the reciprocating member so as to guide the linear movement of the reciprocating member. The method of claim 1, And said actuator is a piezoelectric utlasonic motor having a rectangular parallelepiped body portion in which a plurality of piezoelectric bodies are stacked. The method of claim 1, And the output member is a friction member made of alumina. The method of claim 1, The preload member includes a free elastic end that is bent at right angles to contact the rear end of the actuator, an elastic piece extending in the longitudinal direction of the actuator from an upper end of the free elastic carbon, and an end of the elastic piece extending from the tip of the elastic piece. Lens transport apparatus characterized in that it is provided with a fixed end bent to be assembled to one side of the actuator frame. The method of claim 4, wherein The free elastic end is a lens transfer apparatus, characterized in that the center of the length is provided to be curved toward the rear end side of the actuator so that the partial contact with the body portion of the actuator. The method of claim 4, wherein The elastic piece is a lens conveying apparatus, characterized in that the center of the length is provided to be curved toward the upper surface side of the actuator so that the partial contact with the body portion of the actuator. The method of claim 1, The preload member is longer than the length of the actuator is characterized in that the lens transport device. The method of claim 1, And the guide part comprises a guide roller having a roller that is external to the other side of the reciprocating member and a roller shaft assembled to the center of the roller. The method of claim 8, And at least two guide rollers having a predetermined interval on a vertical axis parallel to the optical axis. The method of claim 1, The guide unit lens transport apparatus characterized in that it comprises a bearing external to the other side of the reciprocating member. The method of claim 10, And at least two bearings on the vertical axis parallel to the optical axis. The method of claim 1, The lens barrel further comprises a barrel frame having an inner diameter that is assembled to guide the movement in the optical axis direction, The actuator is disposed in the actuator frame extending from one side of the barrel frame so that it can be moved only in the pressing direction provided from the preload member, The reciprocating member is a lens conveying apparatus, characterized in that assembled to be transported to the guide frame extending from one side of the barrel frame. The method of claim 12, The preload member is a lens transfer apparatus, characterized in that the fixed end is assembled to be fixed to one side of the actuator frame. The method of claim 12, The guide frame is a lens transfer device characterized in that it is provided integrally with the actuator frame.

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