KR100975923B1 - Lens actuating module - Google Patents

Abstract

The present invention relates to a lens drive module.

Lens drive module of the present invention, the base is provided with a lens barrel receiving portion; A lens barrel mounted to the lens barrel accommodating part and having a guide part formed at one side thereof; An actuator coupled to an actuator mounting portion formed at one side of the lens barrel accommodation portion; A holder mounted to an upper surface of the actuator; And a pressing member whose one end is coupled to the edge of the base to be in close contact with the rear of the actuator, and prevents up and down shaking when the actuator is bent and deformed so that an accurate driving force is transmitted to the guide portion of the lens barrel. Accordingly, there is an advantage that the lens barrel can be driven stably.

Base, lens barrel, actuator, holder, bearing, power connection member

Description

Lens actuating module

The present invention relates to a lens driving module, and more particularly, an actuator is mounted on an actuator mounting portion formed on one side of a lens barrel accommodating portion, and a plate-shaped holder for pressing an upper front surface of the actuator is mounted to allow stable driving of the actuator. In addition, the present invention relates to a lens driving module for preventing tilt.

In general, optical devices such as cameras, camcorders, and small camera modules for mobile devices have been transformed into high pixel centers of millions of pixels with the recent development of technology, and various additional functions such as autofocusing and optical zooming. This is changing to a feasible structure.

Such an optical device is adapted to implement a zoom function or an auto focus adjustment by changing a relative distance by vertical transfer of a lens, and includes a lens transfer device for vertically driving a lens or a lens barrel in which the lens is mounted.

Optical mechanisms with such additional functions increase the number of parts embedded in the camera module mainly by lens transfer using an electromagnetic motor, and thus, the overall size of the optical device is larger than a general camera module.

Therefore, when the camera module is mounted in a limited space such as a portable terminal, difficulty in assembling due to a lack of a camera module mounting space in the terminal body has been derived.

Representative examples of optical devices using such an electromagnetic motor are disclosed in US Patent No. 6,268,970 (name of the zoom lens barrel) and Korean Patent Publication No. 2000-55180 (name of the invention: zoom lens mechanism of the camera). .

The former patent is a cam-driven zoom driving method, and since the relative position of each lens is determined by the shape of the cam during the zoom operation, an additional focus lens and a driving unit for focusing at a specific magnification are required. There is a disadvantage that the driving mechanism such as a lens holding structure moving along.

In addition, the latter patent is a zoom lens mechanism using an electromagnetic motor, there is a problem in the generation of electromagnetic waves, which has been pointed out such a problem that the use of a small communication device is limited. In addition, because of the use of an electromagnetic motor, a gear reduction gear is used, and the mechanical structure is complicated. In addition, a problem arises in that the zoom lens and the focus lens must be moved independently to focus.

Recently, in order to overcome such problems and to use a zoom function in a smaller optical device, development of a microscopic optical zoom device has been made. The trend is to use intelligent devices. As such, replacing the conventional motor driving method can simplify the driving structure for driving the lens and realize high efficiency by direct driving.

Such a conventional lens driving module using a piezoelectric element has a structure in which a soft case is wrapped around an outer surface of an actuator for transmitting a driving force to the lens barrel in mounting an actuator composed of a piezoelectric element on one side of the lens barrel. Mobility is ensured by the soft case when driving the actuator in the longitudinal or thickness direction.

However, when the soft case itself surrounding the actuator is mounted on the lens driving module, it is difficult to secure the top view of the actuator. Thus, the tilt of the actuator may occur, and the lens may be caused by the tilt of the actuator. There is a disadvantage that causes incomplete driving of the barrel.

Accordingly, the present invention has been made in order to solve the above-mentioned disadvantages and problems raised in the conventional lens driving module, the actuator is mounted on the actuator mounting portion formed on one side of the lens barrel receiving portion, so that the actuator is pressed by the plate-shaped holder Accordingly, an object of the present invention is to provide a lens driving module which prevents tilt in the guide part during driving of the actuator so that accurate lens driving is performed according to the driving of a stable actuator.

The object of the present invention is an actuator coupled to a base having a lens barrel receiving portion, a lens barrel mounted to the lens barrel receiving portion, a guide portion formed at one side, and an actuator mounting portion formed at one side of the lens barrel receiving portion of the base. And, it is achieved by providing a lens driving module including a holder which is in close contact with the upper surface of the actuator and a pressing member whose one end is coupled to the edge of the base and the other end is in close contact with one surface of the actuator.

The lens driving module may further include a power connection member surrounding the outside of the base and having one side extension electrically connected to the actuator.

The lens driving module further includes a guide member contacting the guide part extending to one side of the lens barrel to guide the vertical driving path of the lens barrel.

The base is provided with a lens barrel accommodating portion of a circular groove, an actuator mounting portion is formed on one side of the lens barrel accommodating portion, and a guide member coupling hole is provided on one side of the actuator mounting portion.

The lens barrel mounted to the lens barrel accommodating part has a cylindrical shape in which at least one or more lenses are stacked and coupled in multiple stages, and a guide part in which the guide member and the inner surface are in contact with one side thereof is extended.

At this time, a bearing is inserted into the guide portion of the lens barrel in contact with the guide member so that the lens barrel is vertically driven in the lens barrel receiving portion by the rolling drive of the bearing.

In addition, the actuator mounted on the actuator mounting portion is composed of a piezoelectric element that generates a driving force by the vibration in the longitudinal direction and the bending deformation in the thickness direction, the friction member is mounted on the end surface of the actuator.

The friction member mounted on the actuator is in contact with the driving member coupled to the rear of the guide unit so that the driving force of the actuator is transmitted to the guide portion of the lens barrel.

At this time, the actuator is fixed by a holder that is crimped and supported on the upper surface.

The holder is a pair of support protrusions formed on both sides to be in close contact with the actuator upper surface to prevent the tilt (tilt) in the up and down direction when driving by the vibration and bending deformation of the actuator.

On the other hand, the actuator is fixed in the actuator mounting portion by one end of the pressing member is fixed to the corner of the base, the other end of the pressing member is in close contact with the back of the actuator so that the appropriate preload is transmitted to the actuator.

In addition, the power connection member is equipped with an IC chip including a plurality of passive elements on the inner side, the pad is provided at any point in the upper portion is formed an extension to which the power can be applied is electrically connected to the actuator.

As described above, the lens driving module of the present invention is uniformly supported by the holder formed with a pair of support protrusions to transfer the driving force to the lens barrel, thereby preventing up and down shaking when the actuator is bent deformation. As the accurate driving force is transmitted to the guide portion of the lens barrel, there is an advantage that the lens barrel can be stably driven.

In addition, the lens drive module of the present invention has an effect that can reduce the manufacturing cost as the mass production is increased as the holder is composed of a flat-shaped injection molding that can support the upper surface of the actuator uniformly.

Matters relating to the operational effects including the technical configuration for the above object of the lens driving module according to the present invention will be clearly understood by the following detailed description with reference to the drawings in which preferred embodiments of the present invention are shown.

First, FIG. 1 is a perspective view of a lens driving module according to the present invention, FIG. 2 is an assembled perspective view of a lens driving module according to the present invention, FIG. 3 is a sectional view of a lens driving module according to the present invention, and FIG. Is a perspective view in which a power connection member is employed in the lens driving module according to the invention.

As shown, the lens driving module 100 according to the embodiment of the present invention includes a base 110 having a lens barrel accommodating portion 111 and a lens barrel 120 mounted to the lens barrel accommodating portion 111. And, it is composed of an actuator 130 for transmitting a vertical driving force to the lens barrel 120 and a holder 140 for supporting the actuator 130.

The base 110 has a lens barrel accommodating portion 111 having a circular groove shape at one side thereof, and an actuator mounting portion 112 is provided adjacent to the lens barrel accommodating portion 111. In addition, a guide member coupling hole 113 is formed at a corner of the base 110 at one side of the actuator mounting part 112.

A plurality of lenses L are stacked and coupled to the lens barrel accommodating part 111 to insert a cylindrical lens barrel 120 in which a guide part 121 is extended to one side.

The guide portion 121 of the lens barrel 120 is formed to extend to the guide member coupling hole 113 forming portion provided on the edge side of the base 110, is formed bent in the 'c' shape is irregularities on the inner surface Bearing contact portion 121a is provided, and a cylindrical driving member 122 is mounted on an outer surface thereof.

The lens barrel 120 is driven up and down in the lens barrel accommodating part 111 by the vertical driving force transmitted to the guide part 121 extending to one side, and the vertical driving force transmitted to the guide part 121 is The lens barrel accommodating part 111 is generated through an actuator 130 mounted on one side.

The actuator 130 is inserted into the actuator mounting part 112 formed at one side of the lens barrel accommodating part 111, and the front of the actuator 130 is in contact with the rear surface of the guide part 121 of the lens barrel 120. .

The actuator 130 mainly consists of a piezoelectric element, and is a hexahedral piezoelectric ultrasonic motor in which a plurality of piezoelectric elements are stacked, and a plurality of power supply electrode terminals (not shown) are provided at arbitrary external points, thereby providing the electrode terminal. The vibration mode in the longitudinal direction and the bending deformation mode in the thickness direction are generated by the power applied through the battery.

At this time, the driving force due to the displacement caused by the bending deformation caused by the longitudinal vibration and the vibration in the thickness direction of the actuator 130 is transmitted to the guide portion 121 in contact with the front surface of the actuator 130 is the guide portion ( The vertical driving of the lens barrel 120 is formed integrally extending 121.

In addition, the actuator 130, the friction member 131 is coupled to the central portion of the front, the driving member 122 in contact with the friction member 131 is mounted on the rear of the guide portion 121.

Preferably, the friction member 131 and the driving member 122 are made of a ceramic or metal material having a relatively large friction coefficient, and the driving member 122 is preferably configured in the same shape as the friction member 131, but the cylindrical shape It is not limited and is configured in the shape of a semi-circular or hexahedron or the like, in which frictional force can be generated.

Here, the friction member 131 and the driving member 122 are positioned in a direction perpendicular to each other so that the driving force of the actuator 130 can be accurately transmitted to the guide portion 121 by the point contact.

On the other hand, the guide portion 121 of the lens barrel 120 is formed with a concave-convex surface on the inner surface to form a bearing contact portion 121a to which the bearing 150 is coupled, and a bearing mounted on the bearing contact portion 121a ( 150 is in close contact with the cylindrical guide member 160 vertically coupled to the guide member coupling hole 113 of the corner of the base 110.

The bearing 150 mainly consists of a ball bearing to reduce the friction between the guide portion 121 and the guide member 160 so that the driving force of the actuator 130 can be transmitted to the lens barrel 120 through the guide portion 121. When the lens barrel 120 is carried smoothly.

In addition, the bearing 150 is a structure in which a plurality of balls 152 are coupled to each other by symmetry on a pair of vertical supports 151, when the lens barrel 120 is vertically transferred by the ball 152 rolling. As it serves to be driven only in a straight line through the vertical support 151, it serves to prevent the lens barrel 120 from tilting.

On the other hand, the actuator 130 is driven in the longitudinal direction and the thickness direction in the actuator mounting portion 112, so as to be driven by the holder 140 so as to prevent the tilt (tilt) due to shaking in the up and down direction when driving. It is fixed.

The holder 140 is formed in a plate shape and a pair of support protrusions 141 protrude from both sides and the support protrusions 141 support both sides of the upper surface of the actuator 130.

The holder 140 inserts the actuator 130 into the actuator mounting unit 112 when the lens driving module is assembled, and then fixes the upper portion of the actuator 130 through a jig to bond the four sides of the holder 140. The process is fixed to the upper part of the actuator mounting part 112 of the upper part of the actuator 130.

As such, when the actuator 130 is driven by the holder 140 fixed on the actuator mounting part 112, tilting of the upper and lower directions is prevented, and the holder 140 has a tolerance through injection molding. Since the support protrusion 141 is in close contact with the upper surface of the actuator 130 so that only the drive in the longitudinal direction and the thickness direction is possible and the actuator 130 itself moves up or down, or shakes. This is to be prevented.

At this time, the both sides of the upper surface of the actuator 130 to be in point contact by the support protrusion 141 so that the driving of the actuator 130 is not disturbed as much as possible, and the lower surface of the actuator 130 is similar to the upper surface in the base 110 It is preferable to make point contact through the protruding support protrusion 114.

In addition, the actuator 130 is inserted into the actuator mounting portion 112 so that the upper surface is vertically supported by the holder 140, and the back thereof is elastically supported by the pressing member 170.

The pressing member 170 is composed of a leaf spring, one end is coupled to the corner side opposite to the corner to which the guide member 160 is coupled, and the other end thereof is elastically supported by the rear of the actuator 130, The actuator 130 is in close contact with the guide portion 121 of the lens barrel 120 to transmit an appropriate preload in which a driving force may be generated by the driving displacement.

In the lens driving module 100 of the present invention assembled as described above, the power connection member 200 is coupled to the outer circumferential surface of the base 110, and the power connection member 200 may be bent along the edge of the base 110. The electronic component 210 such as an IC chip including a passive element is mounted at any point on the inner surface.

The power connection member 200 wraps the outside of the base 110, and the IC chip including the passive element is electrically connected to serve to fix the base 110, and at the same time, the extension part 220 extending upward. Electrically connected to the electrode terminal (not shown) formed in the 130, so that the power for driving the actuator 130 is applied.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It will be possible, but such substitutions, changes and the like should be regarded as belonging to the following claims.

1 is a perspective view of a lens drive module according to the present invention.

Figure 2 is an assembled perspective view of the lens drive module according to the present invention.

3 is a sectional view of a lens driving module according to the present invention;

Figure 4 is a perspective view of the power supply member is employed in the lens drive module according to the present invention.

<Explanation of symbols for the main parts of the drawings>

110. Base 111. Lens barrel housing

120. Lens Barrel 121. Guide Section

130. Actuator 140. Holder

141. Supporting protrusions 150. Bearings

160. Guide member 170. Pressure member

200. Power connection member 220. Extension part

Claims (10)

A base having a lens barrel receiving portion; A lens barrel mounted to the lens barrel accommodating part and having a guide part formed at one side thereof; An actuator coupled to an actuator mounting portion formed at one side of the lens barrel accommodation portion; A holder mounted to an upper surface of the actuator; And One end is coupled to the edge of the base and the other end is in close contact with the back of the actuator; Lens driving module comprising a. The method of claim 1, The lens driving module further includes a power connection member surrounding the outside of the base and extending from the upper portion to be electrically connected to the actuator. The method of claim 1, The lens driving module further comprises a guide member which is in contact with the guide portion extending to one side of the lens barrel to guide the vertical driving path of the lens barrel. The method of claim 3, The guide member, the lens driving module vertically coupled to the guide member coupling hole provided on one side of the actuator mounting portion. The method of claim 3, A lens driving module having a bearing inside the guide portion of the lens barrel is interposed in contact with the guide member and the other side in contact with the inner surface of the guide portion. The method of claim 1, The actuator is composed of a hexahedral piezoelectric ultrasonic motor that generates a driving force by vibration in the longitudinal direction and bending deformation in the thickness direction, the lens driving module coupled to the front end surface. The method of claim 1, The holder has a support protrusion of one phase formed on both lower surfaces of the holder is in close contact with the upper surface of the actuator. The method of claim 1, The pressing member is a lens driving module consisting of a leaf spring bent one end. The method of claim 8, One end of the pressing member is fixed to the corner portion of the base, the other end is a lens driving module in close contact with the back of the actuator. The method of claim 6, The actuator is a lens driving module which is in close contact with the lower surface of the support protrusion protruding from the base.

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