KR20110024463A - Lens actuating module - Google Patents

Abstract

PURPOSE: A lens actuating module is provided to have a simple structure and reduce material costs. CONSTITUTION: A housing(200) includes a receiving space. A lens barrel(300) is included in the receiving space and integrated with a barrel friction unit. A piezoelectric unit(400) is integrated with a piezoelectric friction unit and is mounted on one side of the housing. The piezoelectric unit supplies a driving force to the lens barrel.

Description

Lens actuating module

The present invention relates to a lens drive module.

In general, personal mobile phone terminals such as electronic devices, mobile phones, PDAs, and the like additional functions are added in addition to the main function, these days, many electronic devices are gaining popularity among consumers by adding a camera function. Therefore, the market of camera modules mounted therein is also expanding.

In response to the demands of the market, camera modules are evolving to include not only fixed focus, but also simple functions as well as additional functions such as auto focus, optical zoom, and optical image stabilization (OIS).

In particular, the lens transfer module using an actuator capable of transferring the lens is essential in order for the camera module to implement autofocus, optical zoom, or OIS.

The actuator of the lens transfer module, which is widely applied to a camera module, is classified into a step motor method, a voice coil motor (VCM) method, a piezo method, and the like. The step motor method is mainly adopted in a general DSC, Piezo methods are generally applied to miniaturization equipment.

Currently, according to the trend of multi-function complex and miniaturization of personal mobile phone terminals, the applied camera module also adopts a piezo method having strengths of miniaturization and reliability.

However, the lens transfer module implemented by employing the piezo actuator has not only a complicated structure but also a high unit cost (particularly, a material cost) of the parts, which ultimately increases the unit price of the product.

The present invention has been made in order to solve the above problems, the friction portion for vertically driving the lens barrel in contact with each other is formed integrally with the lens barrel and the piezoelectric unit, the structure is simple, driving the lens can reduce the material cost To provide a module.

The lens driving module according to the preferred embodiment of the present invention includes a housing having a receiving space, a lens barrel housed in the receiving space, and having a barrel friction portion integrally formed on an outer circumferential surface thereof, and a piezoelectric friction portion contacting the barrel friction portion. And a piezoelectric unit mounted on one side of the housing to provide a driving force to the lens barrel.

Here, the one side of the housing is characterized in that the piezoelectric friction portion is provided with a through portion in which the piezoelectric unit is mounted so as to face the receiving space of the housing.

In addition, the barrel friction portion is formed integrally with the outer circumferential surface of the lens barrel so as to match the driving direction of the lens barrel, the piezoelectric friction portion is formed integrally horizontally with the piezoelectric unit so as to be perpendicular to the driving direction of the lens barrel. It is characterized by.

In addition, a first guide portion is formed on one side of the housing to protrude into the receiving space, the second guide portion is coupled to the first guide portion on the outer circumferential surface of the lens barrel to guide the insertion and vertical drive of the lens barrel. Characterized in that provided.

In addition, the piezoelectric unit may be coupled to an outer circumferential surface of the housing and surface mounted on a circuit board for applying power to the piezoelectric unit.

In addition, the outer side of the housing is characterized in that the elastic member for pressing the piezoelectric unit so that the piezoelectric unit is in close contact with the lens barrel.

In addition, a rotating member is interposed between the lens barrel and the housing, and an inner circumferential surface of the housing includes a first rotating member guide part rotatably guiding the rotating member, and faces the first rotating member guide part. The outer circumferential surface of the lens barrel is characterized in that it comprises a second rotating member guide portion for rotatably guiding the rotating member.

In addition, the first rotating member guide portion is characterized in that it is provided on the other side of the housing facing one side of the housing on which the piezoelectric unit is mounted.

In addition, the rotating member has a structure in which the ball member is coupled to the symmetrical to a pair of vertical support, the first and second rotating member guide portion and the uneven surface rotatably supporting the ball member It is characterized by having a structure.

In addition, the rotating member is composed of a ball member, the first rotating member guide portion is formed on the inner peripheral surface of the housing to have a guiding groove for guiding the rotating member, the second rotating member guide portion for receiving the rotating member It is characterized in that it is formed to protrude on the outer peripheral surface of the lens barrel to have a seating groove.

In addition, the rotating member is composed of a ball member, the first rotating member guide portion is formed to protrude on the inner peripheral surface of the housing to have a seating groove for receiving the rotating member, the second rotating member guide portion to the rotating member It is characterized in that formed on the outer peripheral surface of the lens barrel to have a guiding groove to guide.

In addition, the rotating member is composed of a ball member, the first rotating member guide portion has a groove structure for receiving a second rotating member guide portion protruding on the outer circumferential surface of the lens barrel, the seating groove for receiving the rotating member It characterized by having a.

In addition, the first rotating member guide portion and the second rotating member guide portion is characterized in that a plurality is provided.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may appropriately define the concept of a term in order to best describe its invention The present invention should be construed in accordance with the spirit and scope of the present invention.

According to the present invention, since the barrel friction portion and the piezoelectric friction portion are formed integrally with the lens barrel and the piezoelectric unit, respectively, the structure is simple and the material cost can be reduced.

According to the present invention, there is proposed a rotating member having various structures and a rotating member guide part for guiding the same to facilitate the insertion and driving of the lens barrel.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

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

Lens Drive Module-First Example

1 is an exploded perspective view of a lens driving module according to a first embodiment of the present invention. Hereinafter, the lens driving module 100a according to the present embodiment will be described with reference to this.

As shown in FIG. 1, the lens driving module 100a according to the present embodiment vertically drives a housing 200, a lens barrel 300 mounted in the housing 200, and the lens barrel 300. It comprises a piezoelectric unit 400 for making.

The housing 200 is to provide a space for accommodating the lens barrel 300. The housing 200 has an open top structure, and the housing 200 has an outer shape of the lens barrel 300 so as to support the lens barrel 300 in close contact. It has a receiving space 210 of a corresponding shape.

Here, a through part 220 in which the piezoelectric unit 400 is mounted is formed at one edge of the housing 200.

At this time, around the one corner of the housing 200 in which the penetrating part 220 is formed, the lens barrel 300 is guided when the lens barrel 300 is inserted and in the vertical driving, and the lens barrel 300 of the housing 200 is moved. In order to prevent tilt and rotation, the first guide part 230 to which the second guide part 310 of the lens barrel 300 is coupled is preferably provided. For example, the first guide part 230 is formed to be stepped so that the stepped surface serves to guide the second guide part 310. Here, the first guide portion 230 is preferably provided with a plurality so as to prevent inclination and rotation in one direction, for example, one side edge of the housing 200 with the through part 220 therebetween. It is preferable to be provided in both sides.

On the other hand, the other edge of the housing 200 to reduce the friction between the housing 200 and the lens barrel 300, the first for rotatably supporting the rotating member 340a for helping the vertical movement of the lens barrel 300 It is preferable that the rotating member guide part 240a is provided. For example, the first rotating member guide part 240a is provided at one side edge of the housing 200 in which the through part 220 is formed in the other side facing in a diagonal direction, and one side of the first rotating member 340a. It is formed to have a concave-convex surface shape to rotatably support and guide.

The lens barrel 300 is for collecting an external image into the camera module through the lens L, and has a hollow cylindrical lens having a predetermined internal space such that at least one lens L is arranged along the optical axis. It consists of a receptor.

Here, the outer surface of the lens barrel 300 is integrally provided with a barrel friction portion 320 protruding to contact the piezoelectric friction portion 410 of the piezoelectric unit 400. By adopting a structure in which the barrel friction part 320 is integrated with the lens barrel 300, the barrel friction part 320 may be prevented from being separated from the lens barrel 300. In addition, since the lens barrel 300 can be manufactured at a time while manufacturing the lens barrel 300, the friction member is not manufactured and attached to the outer circumferential surface of the lens barrel 300, thereby simplifying the process.

At this time, the barrel friction portion 320 is formed in a semi-cylindrical shape (in the vertical driving direction of the lens barrel) on the outer peripheral surface of the lens barrel 300. However, the shape and arrangement of the barrel friction portion 320 shown in FIG. 1 will be merely illustrative. That is, the barrel friction part 320 may have any shape (for example, a hexahedron shape) in contact with the piezoelectric friction part 410 to generate a friction force, and the driving direction of the piezoelectric unit 400 and the piezoelectric friction part. Considering the arrangement with the 410, any arrangement in which the lens barrel 300 can be vertically driven by the frictional force by contacting with the piezoelectric friction portion 410 (point contact or line contact) may be possible. It is intended to be included within the scope of the invention.

On the other hand, the outer circumferential surface of the lens barrel 300 corresponding to the first guide portion 230 and the first rotating member guide portion 240a of the housing 200, the second guide portion 310 and the second rotating member guide It is preferable that the part 330a is provided.

Here, the second guide portion 310 is coupled to the first guide portion 230 of the housing 200 and slides to assist insertion and vertical driving of the lens barrel 300 and to prevent tilting and rotation. 1 is formed to protrude on the outer circumferential surface of the lens barrel 300 to correspond to the guide portion 310. At this time, it will be obvious that the second guide part 310 is formed at a position where the second guide part 310 is engaged with the first guide part 230 of the housing 200.

In addition, the second rotating member guide part 330a is for rotatably supporting and guiding the other side of the rotating member 340a and is formed to have an uneven surface shape.

In this embodiment, the rotating member 340a has a structure in which a plurality of ball members 344 are coupled to each other by symmetry on a pair of vertical supports 342, for example, and has a concave-convex surface shape. The guide part 240a and the second rotating member guide part 330a are rotatably supported to guide the vertical movement of the lens barrel 300. At this time, the vertical support 342 is provided in pairs spaced apart by a predetermined interval, at least two or more ball members 344 therebetween, two or more contact between the lens barrel 300 and the housing 200 When the mechanical force is transmitted by the lens barrel 300 by the piezoelectric unit 400 by supporting the excited state, the lens barrel 300 can be driven in a straight line without being inclined.

The piezoelectric unit 400 receives an electrical signal and converts it into a mechanical signal by a piezoelectric body to drive the lens barrel 300. The piezoelectric friction unit 410 formed to protrude on one side is integrally formed, and the housing The piezoelectric friction part 410 is mounted to the through part 220 of the 200 to face the inside of the accommodation space 210.

Here, the piezoelectric friction part 410 is formed integrally with the piezoelectric unit 400 like the barrel friction part 320, thereby preventing the piezoelectric friction part 410 from being separated from the piezoelectric unit 400. Rather, the manufacturing process is simplified.

At this time, the piezoelectric friction portion 410 is formed in a semi-cylindrical shape on the side of the piezoelectric unit 400. However, the shape of the piezoelectric friction part 410 shown in FIG. 1 is exemplary, and any shape that may generate frictional force in contact with the barrel friction part 320 may be employed.

In addition, the piezoelectric friction part 410 is formed on one surface of the piezoelectric unit 400 horizontally (direction perpendicular to the vertical driving direction of the lens barrel). That is, the piezoelectric unit 400 pushes the barrel friction part 320 in contact with the piezoelectric friction part 410 in the vertical direction according to the vibration mode in the longitudinal direction and the bending deformation mode in the thickness direction to push the lens barrel 300 in the vertical direction. Will be driven. However, the horizontal arrangement of the barrel friction portion 320 shown in FIG. 1 is merely an example, and the piezoelectric friction portion 410 is vertically formed on one surface of the piezoelectric unit 400 and corresponds to the barrel. It is also possible to form the friction part 320 horizontally on the outer circumferential surface of the lens barrel 300. That is, by considering the driving direction of the piezoelectric unit 400 and the contact position of the barrel friction portion 320 and the piezoelectric friction portion 410, any arrangement capable of vertically driving the lens barrel 300 by its frictional force is also employed. It will be possible.

On the other hand, the piezoelectric unit 400 is preferably mounted directly to the circuit board 500 to which the power is applied by using a surface mounting technique, and accordingly, the piezoelectric unit 400 is disposed between the piezoelectric unit 400 and the circuit board 500. There is no need to use a flexible member made of rubber, and the cost of parts can be reduced. Here, the circuit board 500 is a flexible substrate member is used, bent to surround the housing 200 is mounted on the outside of the housing 200 to fix the piezoelectric unit 400 to one corner of the housing 200 To do the same thing. At this time, the circuit board 500 may be provided with a position sensor 520 for detecting the position of the lens barrel 300 through the opening formed in the housing 200. However, in the present embodiment, the lens barrel 300 is stably provided at a constant speed by providing the guide members 230 and 310 and the rotating member guide parts 240a and 330a to rotatably support the first rotating member 340a. It will also be possible to omit the position sensor 520 because of the transfer.

In addition, the piezoelectric unit 400 is in close contact with the barrel friction portion 320 of the lens barrel 300, the elastic member for pressing the piezoelectric unit 400 to effectively transmit the mechanical force of the piezoelectric friction portion 410. Preferably, 600 is provided at both ends of the housing 200. In this case, the elastic member 600 is fixed to the housing 200 by inserting both ends of the protrusions 250 formed at the upper and lower ends of the housing 200, for example. Here, the elastic member 600 is a function of absorbing the shock generated in the piezoelectric unit 400 by its elastic force, that is to serve as a flexible member of the conventional conductive rubber material at the same time.

Lens drive module-second Example

2 is an exploded perspective view of a lens driving module according to a second embodiment of the present invention. This embodiment is the same as the previous embodiment except for the structure of the rotating member and the rotating member guide portion for supporting the same reference numerals for the same components, and description of the overlapping parts will be omitted. Hereinafter, the lens driving module 100b according to the present embodiment will be described with reference to this.

As shown in FIG. 2, unlike the first embodiment, the lens driving module 100b according to the present embodiment uses a rotating member 340b composed of only a ball member, and the first rotating member guide part 240b includes a housing ( It has a structure in which a guiding groove for guiding the ball member on the inner circumferential surface of the 200, the second rotating member guide portion 330b is formed to protrude on the outer circumferential surface of the lens barrel 300 to have a seating groove for receiving the ball member Have

That is, the present embodiment does not employ the rotating member 340a of the complicated structure according to the first embodiment, and employs the rotating member 340b that is a ball member, thereby simplifying the structure and reducing the manufacturing cost. It is characterized by the proposal. At this time, when the first rotating member guide portion 240a and the second rotating member guide portion 330a have a concave-convex surface shape as in the first embodiment, the rotating member 340b serving as a ball member interposed therebetween is separated. Since the second rotating member guide part 330b is formed in a structure having a seating groove on the outer circumferential surface of the lens barrel 300, a portion of the second rotating member 340b is accommodated in the seating groove so that the rotating part member ( It is possible to prevent the departure of 340b).

Meanwhile, although four ball members are used in FIG. 2, the number of ball members used may be changed as necessary.

Lens drive module-third Example

3 is an exploded perspective view of a lens driving module according to a third embodiment of the present invention. This embodiment is the same as the previous embodiment except for the structure of the rotating member and the rotating member guide portion for supporting the same reference numerals for the same components, and description of the overlapping parts will be omitted. Hereinafter, the lens driving module 100c according to the present embodiment will be described with reference to this.

As shown in FIG. 3, the lens driving module 100c according to the present embodiment employs a rotating member 340c composed of only a ball member, but unlike the lens driving module 100b according to the second embodiment, the first rotation is performed. The member guide part 240c is formed to protrude on the inner circumferential surface of the housing 200 so as to have a seating groove in which the ball member is accommodated, and the second rotating member guide part 330c is the outer circumferential surface of the lens barrel 300 of the housing 200. It has a structure in which a guiding groove for guiding the ball member is formed.

That is, in this embodiment, as opposed to the second embodiment, the first rotating member guide part 240c provided in the housing 200 has a structure having a mounting groove so as to prevent separation of the rotating member 340c. The housing 200 has an advantage in that processing is easier than forming the lens barrel 300 as a seating groove structure because the selection of materials is wider than that of the lens barrel 300 in which the barrel friction part 320 is integrally formed. .

Lens drive module-fourth Example

4 is an exploded perspective view of a lens driving module according to a fourth embodiment of the present invention. This embodiment is the same as the previous embodiment except for the structure of the rotating member and the rotating member guide portion for supporting the same reference numerals for the same components, and description of the overlapping parts will be omitted. Hereinafter, the lens driving module 100d according to the present embodiment will be described with reference to this.

As shown in FIG. 4, the lens driving module 100d according to the present exemplary embodiment has a structure similar to that of the lens driving module 100b according to the second exemplary embodiment, but includes a first rotating member guide part 240-1d. , 240-2d) and a plurality of second rotating member guides 330-1d and 330-2d. For example, the second rotating member guides 330-1d and 330-2d may be spaced apart from each other by about 120 degrees with respect to the lens barrel 300, thereby more stably supporting the lens barrel 300. It becomes possible. Of course, in Figure 4 it is shown that the plurality of rotating member guides (330-1d, 330-2d) are formed spaced apart by approximately 120 degrees, the lens barrel 300 can be transported in a stable supported state Any arrangement would be possible.

Lens Drive Module-Fifth Example

5 is an exploded perspective view of a lens driving module according to a fifth embodiment of the present invention. This embodiment is the same as the previous embodiment except for the structure of the rotating member and the rotating member guide portion for supporting the same reference numerals for the same components, and description of the overlapping parts will be omitted. Hereinafter, the lens driving module 100e according to the present embodiment will be described with reference to this.

As shown in FIG. 5, the lens driving module 100e according to the present exemplary embodiment has a structure similar to that of the lens driving module 100d according to the fourth exemplary embodiment, but includes a first rotating member guide part 240-1e. , 240-2e has a groove structure in which the second rotating member guide parts 330-1e and 330-2e are formed to protrude on the outer circumferential surface of the lens barrel 300, and the rotating member 340e is accommodated therein. The mounting groove 242 has a structure provided.

At this time, the rotating member 340e is rotatably supported in a state in which a part is accommodated in the seating groove 242, and the remaining part is supported by the first rotating member guides 240-1e and 240-2e of the lens barrel 300. By being supported, the driving of the lens barrel 300 is assisted.

Although the present invention has been described in detail through specific embodiments, this is for explaining the present invention in detail, and the lens driving module according to the present invention is not limited thereto, and the general knowledge in the art within the technical spirit of the present invention. It is obvious that modifications and improvements are possible by those who have them.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

1 is an exploded perspective view of a lens driving module according to a first embodiment of the present invention.

2 is an exploded perspective view of a lens driving module according to a second embodiment of the present invention.

3 is an exploded perspective view of a lens driving module according to a third embodiment of the present invention.

4 is an exploded perspective view of a lens driving module according to a fourth embodiment of the present invention.

5 is an exploded perspective view of a lens driving module according to a fifth embodiment of the present invention.

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

100a, 100b, 100c, 100d, 100e: lens driving module

200: housing

210: accommodation space

220: through part

230: first guide portion

240a, 240b, 240c, 240-1d, 240-2d, 240-1e, 240-2e: first rotating member guide portion

300: lens barrel

310: second guide part

320: barrel friction part

330a, 330b, 330c, 330-1d, 330-2d, 330-1e and 330-2e: second rotating member guide portion

340a, 340b, 340c, 340d, 330e: rotating member

400: piezoelectric unit

410: piezoelectric friction portion

500: circuit board

600: elastic member

Claims (13)

A housing having a receiving space; A lens barrel accommodated in the accommodation space and having a barrel friction portion integrally formed on an outer circumferential surface thereof; And A piezoelectric friction unit which is in contact with the barrel friction portion is integrally formed, mounted on one side of the housing to provide a driving force to the lens barrel Lens drive module comprising a. The method according to claim 1, Lens drive module, characterized in that the one side of the housing is provided with a through portion is mounted the piezoelectric unit so that the piezoelectric friction portion facing the housing space of the housing. The method according to claim 1, The barrel friction portion is integrally formed perpendicular to the outer circumferential surface of the lens barrel so as to coincide with the driving direction of the lens barrel. And the piezoelectric friction part is integrally formed horizontally with the piezoelectric unit so as to be perpendicular to the driving direction of the lens barrel. The method according to claim 1, One side of the housing is formed with a first guide portion protruding into the receiving space, Lens driving module, characterized in that the outer circumferential surface of the lens barrel is coupled to the first guide portion to guide the insertion and vertical drive of the lens barrel. The method according to claim 1, The piezoelectric unit is coupled to the outer peripheral surface of the housing lens driving module, characterized in that the surface mounted on a circuit board for applying power to the piezoelectric unit. The method according to claim 1, Lens driving module, characterized in that the outer side of the housing is provided with an elastic member for pressing the piezoelectric unit such that the piezoelectric unit is in close contact with the lens barrel. The method according to claim 1, A rotating member is interposed between the lens barrel and the housing, An inner circumferential surface of the housing is provided with a first rotating member guide part rotatably guiding the rotating member, And a second rotating member guide portion rotatably guiding the rotating member on an outer circumferential surface of the lens barrel facing the first rotating member guide portion. The method of claim 7, And the first rotating member guide part is provided on the other side of the housing facing one side of the housing on which the piezoelectric unit is mounted. The method of claim 7, The rotating member is symmetrical to the pair of vertical support has a structure in which the ball member is coupled, And the first rotating member guide portion and the second rotating member guide portion have an uneven surface structure to rotatably support the ball member. The method of claim 7, The rotating member is composed of a ball member, The first rotating member guide portion is formed on the inner circumferential surface of the housing to have a guiding groove for guiding the rotating member, and the second rotating member guide portion protrudes on the outer circumferential surface of the lens barrel to have a seating groove for receiving the rotating member. Lens driving module, characterized in that formed. The method of claim 7, The rotating member is composed of a ball member, The first rotating member guide portion is formed to protrude on the inner circumferential surface of the housing to have a seating groove for receiving the rotating member, the second rotating member guide portion is formed on the outer circumferential surface of the lens barrel to have a guiding groove for guiding the rotating member. Lens driving module, characterized in that formed. The method of claim 7, The rotating member is composed of a ball member, The first rotating member guide part has a groove part structure in which a second rotating member guide part is formed to protrude from the outer circumferential surface of the lens barrel, and has a seating groove for receiving the rotating member. The method of claim 7, The lens driving module, characterized in that a plurality of the first rotating member guide portion and the second rotating member guide portion is provided.

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