KR20100106013A - Motor for driving lens - Google Patents

Abstract

PURPOSE: A lens driving motor is provided to improve the reliability of a product by deforming a spring within the range of an elastic limit. CONSTITUTION: A housing(120) is combined with one side of a base(110). A yoke is fixed to the inside of the housing. A bobbin(150) is installed in the inner side of yoke to be elevated. The bobbin is supported to the yoke and combines a body tube with an inner circumference. A spring(185) combines the inner circumference with the bobbin and supports the outer circumference to a housing side. The spring restores the raised bobbin to the initial state by going down the bobbin.

Description

Lens Driving Motor {MOTOR FOR DRIVING LENS}

The present invention relates to a motor for driving a lens.

Today, digital devices with built-in cameras and MP3 players have been developed and used according to the multifunctional trend of digital devices. The lens of the camera built into the digital device is automatically moved and controlled by the lens driving motor.

The lens driving motor has a base and a housing coupled to each other. A bobbin supported by a spring is provided in the housing so as to be liftable, and a barrel is coupled to an inner circumferential surface of the bobbin.

The barrel is screwed to the bobbin. That is, a screw thread is formed on the inner circumferential surface of the bobbin and the outer circumferential surface of the barrel so that the barrel is inserted into the bobbin and rotated to couple the barrel to the bobbin.

When the barrel is inserted into the bobbin and rotated, the bobbin also rotates by torque. By the way, when the bobbin rotates more than a predetermined time, the spring is plastically deformed, so that the bobbin may not function properly.

However, since there is no means for preventing the bobbin from rotating more than a predetermined in the conventional lens driving motor as described above, the spring may be plastically deformed. Therefore, there is a disadvantage that the reliability of the product is lowered.

The present invention has been made to solve the above problems of the prior art, an object of the present invention to provide a lens driving motor that can improve the reliability.

Lens driving motor according to the present invention for achieving the above object, the base; A housing having one surface coupled to the base; A yoke fixed inside the housing; A bobbin mounted to the inside of the yoke so as to be liftable and supported by the yoke to prevent rotation, and having a barrel coupled to an inner circumferential surface thereof; The inner circumferential surface side is coupled to the bobbin and the outer circumferential surface side is supported by the housing side and includes a spring for lowering the raised bobbin to return to the original state.

In the lens driving motor according to the present invention, since one side of the outer circumferential surface of the bobbin is inserted into and supported by the yoke fixed to the housing, the bobbin does not rotate more than a predetermined level. Because of this, the spring supporting the bobbin also does not rotate more than a predetermined, so that the spring deforms only within the range of the elastic limit. Thus, the spring always performs its function, thus improving the reliability of the product.

Hereinafter, a lens driving motor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a lens driving motor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line “AA” of FIG. 1, and FIGS. 3A and 3B are the “P” and “Q” parts of FIG. 2. It is an enlarged view.

As shown, the base 110 and the housing 120 are coupled to each other to form a predetermined space therein.

Hereinafter, in referring to the plane and the direction of other components including the base 110, the plane and the direction toward the vertical direction upward of the base 110 "top and top", the plane and the direction toward the vertical bottom " Lower surface and lower side ".

The housing 120 has a bottom surface coupled to the base 110. At this time, an end surface 111 is formed at the edge of the base 110, and a lower surface of the housing is inserted into the end surface 111. As a result, foreign matter is prevented from entering through the coupling portion of the base 110 and the housing 120.

Through-holes 113 and access holes 123 are formed on the upper surfaces of the base 110 and the housing 120 to face each other.

An inner circumferential surface of the housing 120 includes a rectangular frame-shaped outer wall 131, a ring-shaped inner wall 133 located inside the outer wall 131, and an upper end surface and an inner wall 133 of the outer wall 131. A yoke 130 having a connecting plate 135 connected to the top surface of each other and integrally connecting the outer wall 131 and the inner wall 133 is integrally formed.

The outer wall 131 of the yoke 130 and the connecting plate 135 are integrally formed by being wrapped in the housing 120. At this time, the inner circumferential surface of the housing 120 is formed with a settled groove 125 into which the outer wall 131 of the yoke 130 is inserted. As a result, the yoke 130 is firmly formed in the housing 120.

The magnets 140 are fixed to the inner circumferential surface of the outer side wall 131 of the yoke 130, respectively, and the bobbin 150 is provided on the inner side of the inner wall 133 of the yoke 130 to move up and down. Enter and exit. The barrel 200 is installed on the inner circumferential surface of the bobbin 150, and the coil 160 is wound on the outer circumferential surface.

 The coil 160 faces the magnet 140, and when a current is supplied to the coil 160, the coil 160 rises due to an electromagnetic force formed between the coil 160 and the magnet 140. Then, the bobbin 150 is raised while raising the barrel 200.

The housing 120 is integrally formed with a ring-shaped spacer having elasticity that compensates for tolerances due to dimensional tolerances of components and assembly errors occurring during assembly of the components. The spacer has first and second spacers 171 and 175 which are integrally formed on the bottom and top surfaces of the housing 120, respectively.

The housing 120 is molded by injection, and the yoke 130 and the spacer are integrally formed during the injection of the housing 120.

The bobbin 150 raised by the electromagnetic force is lowered by the springs having the first and second springs 181 and 185 and returned to the original state.

In detail, the inner circumferential surface side of the first spring 181 is integrally formed on the lower circumferential outer surface of the bobbin 150, and the outer circumferential surface side is inserted and supported between the base 110 and the first spacer 171. The inner circumferential surface side of the second spring 185 is coupled to the upper outer circumferential surface of the bobbin 150, and the outer circumferential surface side is inserted between the cover 190 and the second spacer 175 coupled to the upper surface of the housing 120 to be supported. do. Thus, when a current is applied to the coil 160 to raise the bobbin 150, the first and second springs 181 and 185 elastically deform, and when the current applied to the coil 160 is cut off, the first and second springs ( The bobbin 150 is returned to its initial state by the elastic force of 181 and 185.

In order to firmly support the first and second springs 181 and 185, coupling holes 181a and 185a inserted into and coupled to the outer circumferential side of the first and second springs 181 and 185 and the first and second spacers 171 and 175; Coupling protrusions 171a and 175a are formed to correspond.

The cover 190 is coupled to an upper surface of the housing 120 to cover the second spacer 175, thereby preventing foreign matter from entering.

Screw lines are formed on the inner circumferential surface of the bobbin 150 and the outer circumferential surface of the barrel 200, and the barrel 200 is screwed to the bobbin 150. That is, the barrel 200 is inserted into the bobbin 150 and then rotated to couple the barrel 200 to the bobbin 150. Then, the bobbin 150 may be rotated by the torque. When the bobbin 150 is rotated by a predetermined value or more, the first and second springs 181 and 185 may be plastically deformed, thereby failing to function properly.

The lens driving motor according to the present embodiment supports the bobbin 150 to the yoke 130 to prevent the bobbin 150 from being rotated more than a predetermined level, which will be described with reference to FIGS. 2 and 4. 4 is an exploded perspective view illustrating main parts of FIG. 1.

As shown, the outer peripheral surface of the bobbin 150 is formed with a plurality of engaging rails 152 protruding in parallel to the direction of movement of the bobbin 150, the yoke 130 is an opening groove that is engaged with the engaging rail 152 is inserted 130a is formed parallel to the direction of motion of the bobbin 150.

Then, even when the bobbin 150 is rotated by the torque generated when the barrel 200 is coupled to the bobbin 150, the locking rail 152 is caught by the portion of the yoke 130 forming the open groove 130a. The bobbin 150 is prevented from rotating more than a predetermined amount.

The opening groove 130a is formed in communication with a portion of the inner wall 133 and the connecting plate 135 in contact with the inner wall 133.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Of course.

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

FIG. 2 is a cross-sectional view taken along the line “A-A” of FIG. 1.

3A and 3B are enlarged views of a “P” portion and a “Q” portion of FIG. 2.

4 is an exploded perspective view of the main portion of FIG. 1.

Explanation of symbols on the main parts of the drawings

110: base 120: housing

130: York 140: magnet

150: bobbin 160: coil

171,175: First and second spacer 181,185: First and second spring

190: cover

Claims (7)

Base; A housing having one surface coupled to the base; A yoke fixed inside the housing; A bobbin mounted to the inside of the yoke so as to be liftable and supported by the yoke to prevent rotation, and having a barrel coupled to an inner circumferential surface thereof; An inner circumferential surface side is coupled to the bobbin, and an outer circumferential surface side is supported by the housing side and includes a spring for lowering the raised bobbin to return to the original state. The method of claim 1, Lens driving motors formed on the outer circumferential surface of the bobbin and the yoke are respectively provided with a latching rail and an open groove which are engaged with each other in parallel to the direction of movement of the bobbin. The method of claim 2, The yoke is integrally formed with an outer wall fixed to the housing, an inner wall located inside the outer wall, a cross section of the outer wall facing the other surface side of the housing, and a cross section of the inner wall so that the outer wall and the With the connecting plate connecting the inner wall, The opening groove is a lens driving motor formed by communicating the inner wall and the connecting plate. The method of claim 1, Lens driving motors are integrally formed on one surface and the other surface of the housing to compensate for the dimensional and assembly tolerances of the components. The method of claim 4, wherein The spring is provided in pairs, the inner circumferential surface side is coupled to the bobbin and the outer circumferential surface side are respectively supported by the spacer. The method of claim 5, Lens driving motors formed on the outer circumferential surface side of the spacer and the spring, respectively, coupling protrusions and coupling holes which are inserted into and coupled to each other. The method of claim 1, A lens driving motor having a cover coupled to the other surface of the housing.

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