KR20150088044A - Camera Lens Assembly - Google Patents

Abstract

Provided is a camera lens assembly. The camera lens assembly of the present invention includes: a lens barrel comprising at least one lens; a barrel housing which has a cover part which has a penetrating exposure hole exposing the lens barrel and is assembled at one open side, and accommodates the lens barrel internally; a main substrate which is assembled to another open side of the barrel housing as being mounted with an image sensor corresponding to the lens barrel; a guide supporting part which supports the lens barrel as guiding the lens barrel along an optical axis by being assembled to the open one side of the barrel housing; a driving part which drives the lens barrel along the optical axis by mutual interaction between an electric field of the coil comprised at one side of the guide supporting part and a magnetic field of a magnet comprised in the lens barrel; and a pattern circuit part which applies an external power to the coil by comprising at least one conductive via hole penetrating through the guide supporting part in order to connect an internal pattern connected to the coil electrically by being comprised in an inner side of the guide supporting part and an external pattern connected to the main substrate electrically by being comprised in the outer circumference of the guide supporting part. At least one cutting part, which is cut to expose the conductive via hole to the outside, is comprised at an outer edge of a yoke comprised on the outer circumference of the guide supporting part. And at least one magnetic field inducing part extended to the outside in order to induce the magnetic field generated in the magnet to the coil is comprised in the outer circumference of the guide supporting part.

Description

Camera Lens Assembly}

The present invention relates to a camera lens assembly, and more particularly, to a camera lens assembly capable of increasing a magnetic field induced from a magnetic body to a coil side by changing the shape of a yoke to increase driving efficiency by interaction with an electric field of the coil, And more particularly, to a camera lens assembly capable of eliminating a component assembly process and reducing the number of components, thereby improving work productivity and cost competitiveness.

Background Art [0002] With the recent development of digital camera manufacturing technology, mobile communication terminals equipped with a compact and lightweight camera lens assembly are gradually infiltrating the compact digital camera market. 2. Description of the Related Art [0002] Attaching camera lens assemblies to mobile communication terminals is becoming common and efforts are being made to improve the performance of such camera lens assemblies.

For example, although the automatic focus adjustment function for correcting the focus error caused by the shooting distance of the subject in the image shooting has been installed in an expensive mobile communication terminal, it is gradually being installed in a power supply terminal.

In addition, although the performance of the camera lens assembly and the precision of the manufacturing technology are improved and the mobile communication terminal gradually encapsulates the compact digital camera market, the main functions of the mobile communication terminal, that is, The performance of the camera lens assembly mounted on the mobile communication terminal is limited to the same level as the performance of the digital camera.

That is, even a general compact digital camera basically includes an optical zoom function and an auto focus function. In addition, although the digital camera has a camera shake correction function depending on the product, the mobile communication terminal needs to consider the portability while making the communication function a main function. Therefore, even if the camera lens assembly is mounted, the optical zoom function, It is difficult to install the camera shake correction function.

The optical zoom function and the camera shake correction function in the camera lens assembly mounted on the mobile communication terminal are employed in an extremely limited manner due to difficulty in realizing spatial constraints and performance. However, in comparison with the optical zoom function and the shake correction function, An easy auto focus adjustment function is often installed in a camera lens assembly built in a mobile communication terminal.

However, the conventional camera lens assembly incorporating the auto focus adjustment function can not flexibly cope with the technological evolution of miniaturization of the mobile communication terminal.

Also, in the performance implementation, it is practically impossible to check whether the lens has moved to the target position by using the open loop control method for moving the lens according to the intensity of the current applied from the image sensor assembly. There is a phenomenon of skipping a section, which has a limitation in providing a clear image to the user.

In addition, as the camera lens assembly has a high resolution and high performance, an actuator mounted thereon has a high resolution and a high accuracy, and an auto focus control area corresponding to a high pixel is expanded, so that a need for a product capable of shortening an auto focus adjustment time is increased have.

In addition, there is a demand for a product that can contribute to reduction of defects of an auto focus actuator and improvement of a yield of a camera lens assembly, considering that a terminal product equipped with a camera lens assembly of more than 8 million pixels is expensive.

On the other hand, in Korean Patent Registration No. 10-1041473 (Jun. 6, 2011), there is disclosed a lens assembly comprising a magnetic body disposed on a lens assembly, a coil disposed on the main frame and facing the magnetic body to generate an electric field when power is applied, A portion of the yoke is bent and extended so as to surround the coil in a driving unit assembly including a yoke which is disposed so as to face the magnetic body with the coil interposed therebetween. When no power is applied to the coil, The lens assembly moves close to the image sensor by the attraction force, but interferes with a part of the main frame and stops at a predetermined position.

However, in such a conventional camera lens assembly, it is necessary to provide a side substrate on which the coil is mounted and to be electrically connected, and to fix the yoke to the driving assembly so as to face the magnetic body, and the input / The process of fixing the side substrate and the yoke to the driving unit assembly is complicated and the manufacturing cost is increased.

Further, when the yoke is embedded in the drive assembly, which is an injection molded body, to integrally mold the yoke and the coil, the focusing of the magnetic flux generated in the coil to the yoke is deteriorated , Which has been a factor for lowering the driving efficiency of the lens assembly due to the interaction between the electric field of the coil and the magnetic field of the magnetic body.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to increase the magnetic field induced from the magnetic body to the coil side by changing the shape of the yoke to increase the driving efficiency by the interaction with the electric field of the coil And a side substrate, and to reduce the number of component parts, thereby improving work productivity and cost competitiveness.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

In order to achieve the above object, the present invention provides a lens barrel comprising at least one lens; A barrel housing assembled to an open side of the cover portion formed through the exposure hole exposing the lens barrel and internally accommodating the lens barrel; A main board mounted with the image sensor corresponding to the lens barrel mounted on the opened side of the barrel housing; A guide supporter assembled on an open side of the barrel housing and guiding the lens barrel in the optical axis direction; A driving unit for driving the lens barrel in an optical axis direction by an interaction between an electric field of a coil provided on one side of the guide support unit and a magnetic force of a magnetic body provided on the lens barrel; And an inner pattern provided on an inner surface of the guide support portion and electrically connected to the coil and an outer pattern provided on an outer surface of the guide support portion and electrically connected to the main substrate, And at least one conductive via hole penetratingly formed on the outer circumferential surface of the conductive support hole to apply external power to the coil, And at least one magnetic field inducing part extending outward to guide the magnetic field generated by the magnetic body to the coil side.

Preferably, the magnetic field inducing portion includes protruding pieces extending a predetermined length from the upper outer rim of the yoke.

More preferably, the magnetic induction portion further includes auxiliary protrusions extending a predetermined length from the lower outer edge of the yoke to the lower portion.

More preferably, the projecting piece or the auxiliary projecting piece is bent at an angle inclined to the coil side.

More preferably, the projecting piece or the auxiliary projecting piece has a groove formed outwardly in a boundary region with the upper outer rim or the lower outer rim of the yoke.

Preferably, the magnetic induction portion further includes a bent piece bent from one of the left and right ends of the yoke to the coil side.

Preferably, the yoke is integrally inserted into the yoke arranging portion formed in the yoke arranging portion formed at a certain depth on the outer surface of the guide supporting portion on which the external pattern is formed, or integrally formed in the molding of the separating wall made of resin.

More preferably, the yoke arranging portion includes a fixing jaw to which a groove cut outwardly in a boundary region between the outer rim of the yoke and the magnetic field inducing portion is fixedly coupled and fixed.

The present invention as described above has the following effects.

(1) By providing a magnetic field inducing portion that extends outward so that a magnetic field generated by the magnetic body can be guided to the coil side without loss at the outer edge of the yoke mounted on the outer surface of the guide support portion, the magnetic field induced in the coil- It is possible to increase the driving efficiency due to the interaction between the increased magnetic field and the electric field of the coil while increasing the coupling force with the guide support portion, thereby enhancing the product reliability.

(2) a pattern circuit part for forming an electrically conductive via hole for connecting between inner and outer patterns provided on inner and outer surfaces of the guide support part and applying external power to the coil, so that a separate side substrate is provided on one side of the guide support part It is possible to eliminate the process of assembling or fixing on the side surface, reducing the number of constituent parts, increasing work productivity and reducing manufacturing cost.

1 is an exploded perspective view illustrating a camera lens assembly according to a preferred embodiment of the present invention.
2 is an exploded perspective view of a camera lens assembly according to a preferred embodiment of the present invention.
FIG. 3 is a view illustrating a coupling state between a guide support portion and a yoke, which is employed in a camera lens assembly according to a preferred embodiment of the present invention,
(a) is an exploded perspective view,
(b) is a combined perspective view.
4A through 4C are perspective views illustrating various types of yokes used in a camera lens assembly according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to include an element does not exclude other elements unless specifically stated otherwise, but may also include other elements.

1 to 3B, the camera lens assembly 100 according to the preferred embodiment of the present invention includes a lens barrel 110, a barrel housing 120, a cover portion 130, a main substrate 140, A guide supporting portion 150, a driving portion 160, and a pattern circuit portion 170.

The lens barrel 110 includes a substantially hollow cylindrical barrel structure having at least one lens in the direction of the optical axis in the inner space.

On the upper surface of the lens barrel 110, a lens hole 112 is formed so as to expose a built-in lens, and a magnetic body 162, which is a permanent magnet in a substantially rectangular cross section, Fix it.

The magnetic body 162 is provided on a planar surface 114 facing the side surface of the barrel housing 120 at regular intervals.

The left and right sides of the lens barrel 110 are provided with guide projections 116 and 116 that are substantially perpendicular to guide the movement of the lens barrel 110 in the optical axis direction corresponding to the guide support part 150.

The barrel housing 120 may be a substantially rectangular box structure having an internal space of a predetermined size to accommodate the lens barrel 110 movably in the optical axis direction.

The upper and lower portions of the barrel housing 120 are respectively opened to expose the lens hole 112 of the lens barrel 110 to the outside while sealing the upper portion of the opened side of the barrel housing 120 And a cover part 130 which is a lid member of a substantially rectangular plate shape formed by passing the exposure hole 132 in a substantially central area.

In the opened lower portion of the barrel housing 120, an image sensor 142 for detecting an image of an object incident through a lens on an upper surface corresponding to the lens barrel 110 and converting an electrical signal is mounted. The substrate 140 is disposed.

The main board 140 includes a printed circuit board member that is assembled to the lower end of the barrel housing 120 to seal the lower open end of the barrel housing 120.

The guide support unit 150 includes a pair of guide protrusions 154 and 154 facing the pair of guide protrusions 116 and 116 formed on the lens barrel 110 to guide the lens barrel 110 in the optical axis direction.

The pair of guiding protrusions 154 and 154 can be detachably mounted to cover or open the one open side 125 of the barrel housing 120 corresponding to the magnetic body 162 provided on one side of the lens barrel 110 And may be provided on both inner ends of the separating wall 151 that is assembled to be assembled.

At least one friction such as a steel ball is provided between the guide protrusions 116 and 116 formed at the left and right sides of the lens barrel 110 and the guide grooves 154a and 154a formed at the guide protrusions 154 and 154 of the separation wall 151 The reducing members 156 and 156 are disposed.

The upper ends of the guide jaws 154 and 154 interfere with the upper ends of the guide protrusions 116 and 116 formed on the lens barrel 110 to restrict the upward movement of the lens barrel and prevent the contact with the cover 130. [ It is preferable to provide jaws 154b and 154b.

Accordingly, separation of the guide supporter 150, which is a fixing member fixed to the barrel housing 120 by the friction reducing members 156 and 156 interposed between the guide protrusions 116 and 116 and the guide grooves 154a and 154a, The frictional resistance and the frictional force generated when the lens barrel 110, which is the moving member, move in the optical axis direction with respect to the wall 151 can be minimized.

The barrel housing 120 has an engaging groove 124 formed at an inner surface of the barrel housing 120 so that both ends of the separating wall 151 are inserted and assembled, The separating wall 151 can be slidably assembled to the coupling groove 124 to open the opening 125 of the barrel housing 120 or to form a wall.

The guide supporting part 150 including the guide protrusions 154 and 154 and the guide grooves 154a and 154a formed therein has a separating wall 151 for opening and closing an opening 125 formed at one side of the barrel housing 120, However, the present invention is not limited thereto and may be provided on one inner wall surface extending perpendicularly from the bottom surface of the barrel housing 120 and facing the magnetic body 162.

The guide support part 150 is provided with a friction reducing member 156 between the guide protrusions 116 and 116 and the guide grooves 154a and 154a to guide and support the lens barrel 110 in the direction of the optical axis However, the present invention is not limited thereto. The guide bar may be provided with a guide groove formed in the lens barrel, a guide bar assembled to be guided thereby, or a guide vertical shaft provided in the lens barrel and a guide hole assembled to the guide bar.

The driving unit 160 includes a coil 164 provided in a separation wall 151 forming a magnetic field generated from a magnetic body 162 provided at one side of the lens barrel 110 and an inner wall of one side of the barrel housing 120, So that an external force is generated to drive the lens housing 120 in the optical axis direction.

 The coil 164 is mounted on the inner surface of the separating wall 151 of the guide supporting part 150 corresponding to the magnetic body 162 and is electrically connected to the main board 140 via the pattern circuit part 170. [ .

An electronic part 166 such as a Hall sensor, a driving driver, and a capacitor is provided on the separation wall 151 constituting the guide support part 150 to sense and control the position of the lens barrel 110 moving in the optical axis direction. .

The pattern circuit part 170 includes an inner pattern 171 patterned on the inner surface of the separation wall 151 of the guide support part 150 facing the magnetic body so as to be electrically connected to the coil 164, And an outer pattern 173 patterned on the outer surface of the separation wall 151 of the guide support 150 so as to be electrically connected to the main board 140 connected to the main board 140. The inner pattern and the outer pattern are electrically And at least one conductive via hole (172) connecting the conductive via hole (172).

Here, the inner pattern 171 and the outer pattern 173 are formed by selectively forming a predetermined pattern on the outer surface of the separating wall 151, which is injection-molded by the resin injected into the cavity of the mold, (Molded Interconnect Device) method in which a conductive pattern is formed secondarily using electroless plating.

The conductive via hole 172 is filled in a through hole formed in the wall surface of the separating wall 1751 so as to be electrically connected to the inner pattern 171 and the outer pattern 173, Respectively.

The connection terminals 144 provided on the surface of the main board 140 at the time of assembling the barrel housing 120 and the main board 140 are soldered to the lower ends of the inner and outer surfaces of the separating wall 151, 173a extending from the inner and outer patterns 171, 173 so that the connection pads 171a, 173a can be connected to each other.

The yoke 163 is made of a metal plate so that the magnetic field generated by the magnetic body 162 can be guided to the coil side. And at least one cut-out portion 167 cut on the rim so as to be exposed to the outside without being in contact with the conductive via hole 172.

The cutout portion 167 may be formed as a substantially U-shaped cutout opening formed outwardly on the outer edge of the yoke 163 corresponding to the conductive via hole 172.

The yoke 163 has at least one magnetic field guiding part 165 which extends a certain length outward so as to increase a magnetic field induced by inducing a magnetic field generated by the magnetic body 162 to the coil 164 side, do.

The magnetic induction unit 165 includes a protruding piece 165a extending from the upper end of the upper end of the yoke 163 to a predetermined length and disposed in the fixing groove 158a of the separating wall 151, It is preferable that the coil 165a is formed so as to be inclined at a predetermined angle to the coil 164 so as to increase the overall length and increase the induction efficiency of inducing the magnetic field generated by the magnetic body 162 to the coil side.

Here, the protruding piece 165a may be bent to a predetermined angle inclined toward the coil 164 to facilitate the bending process, while preventing the stress concentration occurring in the bending process, It is preferable to have a groove 166a cut outwardly in the region.

The magnetic induction unit 165 is formed on one side of the left and right ends of the yoke 163 to bend toward the coil 164 so that the magnetic field generated by the magnetic body 162, The bending piece 165b may be provided so as to further enhance the induction efficiency of guiding the bending portion 165b.

The yoke 163 is inserted or arranged in a yoke arrangement part 158 which is recessed at a predetermined depth on the outer surface of the separation wall 151 of the guide support part 150 in which the external pattern 173 is formed, And may be integrally fixed to the separating wall 151 formed of water.

The yoke arranging portion 158 is provided with a fixing jaw 158b to which a groove 166a cut out in the boundary region between the upper outer edge of the yoke 163 and the protruding piece 165a is fixedly coupled .

Accordingly, the protrusions 165a and the bent pieces 165b of the magnetic induction unit 165 provided in the yoke 163 minimize the loss in the process of inducing the magnetic field generated by the magnetic body 162 to the coil side, The driving efficiency of driving the lens barrel 110 in the direction of the optical axis can be enhanced by the interaction between the increased magnetic field and the electric field of the coil 164 so as to increase the magnetic field.

4B, the magnetic induction portion 165 extends from the lower edge of the yoke 163 to a lower portion of the yoke 163 and extends to a lower portion of the yoke 163 for a predetermined length. The magnetic induction portion 165 is an electric field generated in the magnetic body, It is preferable that the auxiliary projecting piece 165c is provided.

4C, the magnetic induction portion 165 is extended from the lower edge of the yoke 163 to a lower portion by a predetermined length and bent at a predetermined angle to the coil side, It is preferable to provide another auxiliary protruding piece 165d so as to increase the electric field induced in the coil side.

The auxiliary protrusions 165d and the yoke 163 are cut outwardly in a boundary region between the outer edge of the lower end of the yoke 163 and the yoke 163 to facilitate the bending process, (166b).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

110: lens barrel
112: Lens ball
114:
120: barrel housing
125: opening
130:
140: main substrate
150:
151: separating wall
154: guide chin
154a: guide groove
156: Friction reducing member
158: yoke arrangement part
160:
162: magnetic body
163: York
164: coil
165:
165a:
165b:
165c, 165d: auxiliary protruding pieces
170: pattern circuit part
171: Internal pattern
172: conductive via hole
173: External pattern
171a, 173a: connection pad

Claims (8)

A lens barrel having at least one lens;
A barrel housing assembled to an open side of the cover portion formed through the exposure hole exposing the lens barrel and internally accommodating the lens barrel;
A main board mounted with the image sensor corresponding to the lens barrel mounted on the opened side of the barrel housing;
A guide supporter assembled on an open side of the barrel housing and guiding the lens barrel in the optical axis direction;
A driving unit for driving the lens barrel in an optical axis direction by an interaction between an electric field of a coil provided on one side of the guide support unit and a magnetic force of a magnetic body provided on the lens barrel; And
An inner pattern provided on an inner surface of the guide support portion and electrically connected to the coil and an outer pattern provided on an outer surface of the guide support portion and electrically connected to the main substrate, And a pattern circuit portion having at least one conductive via hole formed therein to apply external power to the coil,
At least one cut-out portion that is cut out to externally expose the conductive via hole is formed on the outer edge of the yoke provided on the outer surface of the guide support portion, and at least one outwardly extending magnetic field is generated to guide the magnetic field generated from the magnetic body to the coil side And a magnetic field guiding part. The method according to claim 1,
Wherein the magnetic field inducing portion includes protruding pieces extending a predetermined length from the upper outer edge of the yoke. 3. The method of claim 2,
Wherein the magnetic induction portion further comprises auxiliary protruding pieces extending a predetermined length from a lower outer edge of the yoke to a lower portion thereof. The method of claim 3,
Wherein the protruding piece or the auxiliary protruding piece is bent at a predetermined angle to the coil side. The method of claim 3,
Wherein the protruding piece or the auxiliary protruding piece has a groove formed outwardly in a boundary region with an upper outer rim or a lower outer rim of the yoke. 6. The method according to any one of claims 1 to 5,
Wherein the magnetic induction portion further includes a bent piece bent from one side of the left and right ends of the yoke to the coil side. 6. The method according to any one of claims 1 to 5,
Wherein the yoke is integrally inserted into the yoke arranging part formed in a recessed depth on the outer surface of the guide supporting part on which the external pattern is formed or integrally formed with the molding part of the resin wall. . 8. The method of claim 7,
Wherein the yoke arranging portion includes a fixing jaw to which a groove cut outwardly in a boundary region between the outer rim of the yoke and the magnetic field inducing portion is coupled and fixed.

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