KR20170065951A

KR20170065951A - Dual camera module using united voice coil motor

Info

Publication number: KR20170065951A
Application number: KR1020150172372A
Authority: KR
Inventors: 서정화; 김대현; 김인환; 허남문
Original assignee: 주식회사 나무가
Priority date: 2015-12-04
Filing date: 2015-12-04
Publication date: 2017-06-14

Abstract

The present invention is applied to an AF camera (Auto Focus Camera) technology in which two image sensors and a lens are mounted on one camera. By designing two actuators in one body (body), problems of mechanical error and optical error are improved To a dual camera module to which an integrated VCM (Voice Coil Motor) is applied, and more particularly to a dual camera module to which a first image sensor and a second image sensor are mounted; A first actuator coupled to an upper portion of the PCB with the first image sensor disposed thereunder and a second actuator coupled to an upper portion of the PCB with the second image sensor disposed thereunder; A lens module unit including a first lens module inserted and raised in the first actuator and a second lens module inserted and raised in the second actuator; And an IR filter coupled to a lower portion of the lens transfer unit and positioned between the lens transfer unit and the image sensor, wherein the lens transfer unit is formed as a single body. .

Description

Dual Camera Module with Integrated VCM {DUAL CAMERA MODULE USING UNITED VOICE COIL MOTOR}

The present invention relates to a dual camera module to which a voice coil motor (VCM) applied to a tablet phone, a tablet PC, a mobile device, or the like is applied. More particularly, (VCM) to improve the mechanical error and optical error problem by designing two actuators in a single body (body).

FIG. 1 is an exploded perspective view of a dual camera module to which a conventional VCM is applied, FIG. 2 is a view illustrating a combined state of the dual camera module of FIG. 1, FIG. 3 (a) FIG. 3 (b) conceptually shows the warpage (deformation) phenomenon of the actuator due to the mechanical error occurring in the construction as shown in FIG. 3 (a).

Referring to FIGS. 1 and 2, a conventional AF (Auto Focus) dual camera attaches two image sensors 200 and 300 to a PCB 100 as a printed circuit board, An IR filter 600 is positioned above the IR filter 600 and two actuators 410 and 420 are positioned on top of the IR filter 600 to be coupled to the PCB 100 and each of the actuators 410 and 420 Are coupled to the lens modules 510 and 520, respectively.

However, the two actuators 410 and 420 must be used in combination with two bodies (lens transfer parts). As a result, each component must be divided into two parts to perform the work process, , There was a mechanical error problem in the working process, which led to the optical error problem.

As shown in FIG. 3 (a), one actuator is constituted in one lens transfer part, four magnets 700 are provided in the left and right parts of the inside of the lens transfer part, respectively, and four actuators And a total of eight magnets 700 are arranged by combining two lens transfer parts in the open configuration.

However, when the two actuators 410 and 420 are arranged close to each other, a magnetic interference phenomenon occurs between adjacent magnets 700 among the four magnets 700 mounted inside the actuators 410 and 420.

That is, magnetic field interference is generated by a force of 0.002 N in the X-axis direction and 0.002 N in the Y-axis direction. As a result, a current is applied to the actuators 410 and 420 to cause a tilt phenomenon Auto Focus is not implemented because it can not rise vertically.

3 (b), due to the magnetic interference phenomenon between the magnets 700, the actuators 410 and 420 are deformed (malfunctioned) during operation, Which leads to optical error problems.

As shown in FIG. 2, the actuators 410 and 420 are formed by forming air gaps at regular intervals (about 0.5 mm) between the actuators 410 and 420, but they are not a fundamental solution.

In the past, a mechanical error of +/- 0.1 mm occurred in one actuator, resulting in a mechanical error of +/- 0.2 mm in total, resulting in an optical error of 178 pixels based on the image sensor pixel (1.12 um size) .

Fig. 4 is a photograph showing a photograph area (red display portion) of 178 pixels.

In order to solve this problem, a separate bracket (not shown) has been additionally provided outside the two actuators 410 and 420. However, this has a problem that the installation area and the volume increase, Still remained.

On the other hand, a technique relating to a dual camera module is disclosed in Patent No. 10-1459753.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide an image forming apparatus and a method of manufacturing the same, which can reduce the error range of an image by improving the mechanical error and the optical error problem by configuring two actuators in one body, And a dual camera module to which an integrated VCM is applied.

According to another aspect of the present invention, there is provided a zoom lens comprising: a lens body having a lens body and a plurality of actuators; The present invention provides a dual camera module to which an integrated VCM is applied.

Another object of the present invention is to provide a dual camera module in which an integrated VCM capable of preventing magnetic field interference between coils wound on an actuator is constructed by forming a shielding member between two actuators.

In order to achieve the above object, the dual camera module to which the integrated VCM is applied according to the present invention comprises a voice coil motor (VCM) including a first actuator and a second actuator for transferring the first lens module and the second lens module, Wherein the first actuator and the second actuator are formed on one body.

In addition, the IR filter formed of two electrodes is also manufactured as an integral type.

Further, the magnet is formed only on the front and rear sides of the first actuator and the second actuator, respectively.

Further, a shielding member is provided between the first actuator and the second actuator.

As described above, according to the present invention, the two actuators are configured in one lens transfer body, and the IR filter is also formed as one unit and mounted on the lower portion of the lens transfer unit, the manufacturing process is simplified and the manufacture is easy And it is possible to improve the mechanical error that has occurred in the process and the optical error caused thereby.

Further, by solving the optical error problem, it is possible to satisfy the requirement that the camera is used in the game, the position information, etc. with the measured value by the depth measurement of the present camera.

In addition, when the position error between two lenses is large, the error of each image coordinates becomes large. When two images with large errors are processed by AP (Application Precessor) into one image, there is a problem of quality deterioration of the combined Fusing image One can improve it.

In addition, by providing the magnets only in front and rear, not in the front, back, right, and left sides, in one actuator, magnetic interference phenomenon between adjacent magnets can be reduced.

Also, since the number of magnets can be reduced from 8 to 4 in total, and the number of magnets can be reduced to four, a separate mounting bracket for preventing the tilting phenomenon can be omitted. As well as the overall size of the dual camera module can be compactly configured.

Further, by forming the shielding member between the actuators, it is possible to prevent the magnetic interference phenomenon between the coils wound on the actuator.

1 is an exploded perspective view of a dual camera module to which a conventional VCM is applied,
FIG. 2 is a view for showing a combined state of the dual camera module of FIG. 1,
3 (a) conceptually shows the position of a magnet applied to a conventional dual camera module,
3 (b) conceptually illustrates the warpage (deformation) phenomenon of the actuator due to the mechanical error occurring in the configuration as shown in FIG. 3 (a)
Fig. 4 is a photograph showing a photograph area (red display portion) of 178 pixels,
5 is an exploded perspective view of a dual camera module to which an integrated VCM according to the present invention is applied,
FIG. 6 is an assembled perspective view of FIG. 5,
Fig. 7 (a) conceptually shows the position of a magnet applied to the present invention,
7 (b) is a conceptual view of the problem of deformation of the actuator according to the present invention, compared with FIG. 3 (b)
8 (a) is a plan view of a lens transferring part of a dual camera module to which an integrated VCM according to the present invention is applied,
FIG. 8 (b) is a bottom view of a lens transfer unit incorporating an IR filter of a dual camera module to which an integrated VCM according to the present invention is applied,
Fig. 9 is a photograph showing a photographic area (red display portion) of 70 pixels.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail.

It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms.

The terms used herein are used only for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

First, the actuator according to the present invention includes a carrier for vertically moving a lens module, and a magnet is positioned inside and a coil or the like is wound. However, this structure is well known in the art and is unnecessary in explaining the gist of the present invention And the description will be omitted.

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

FIG. 5 is an exploded perspective view of a dual camera module to which an integrated VCM according to the present invention is applied, and FIG. 6 is an assembled perspective view of FIG.

The structure of a dual camera module to which the integrated VCM of the present invention is applied will be described with reference to FIGS. 5 and 6. FIG.

The present invention relates to a dual camera module to which a voice coil motor (VCM) is applied. In the PCB 100, a first image sensor 200 and a second image sensor 300 are attached to each other with a predetermined distance therebetween.

The first actuator 410 and the second actuator 420 are configured to be symmetrical to the left and right of the lens transfer unit 400 composed of one body.

The lens actuator 400 is coupled to the upper portion of the PCB 100 and the first actuator 410 is positioned on the upper portion of the first image sensor 200 and the second actuator 420 is positioned on the upper portion of the second image sensor 300, As shown in FIG.

The lens module unit 500 includes a first lens module 510 and a second lens module 520. The first lens module 510 is inserted and raised in the first actuator 410, (520) is inserted into the second actuator (420) and ascended and descended.

The first lens module 510 and the second lens module 520 are disposed on the lower part of the lens transfer part 400 and on the upper part of the first image sensor 200 and the second image sensor 300, IR filter 600 of FIG.

Unlike the dual camera module to which the conventional VCM is applied as shown in FIGS. 1 and 2, the lens transfer part 400 is formed as a single body, and the first and second actuators 410 and 420 ).

In this configuration, the problem of mechanical error can be reduced compared with a conventional method in which two separate actuators are used in combination, and the manufacturing process can be further simplified and facilitated, thereby improving work efficiency.

7A is a conceptual view of the position of the magnet 700 applied to the present invention and FIG. 7B is a schematic view of the actuators 410 and 420 ) Of the magnetic field interference phenomenon.

7A, since two actuators 410 and 420 are provided in one lens transfer unit 400, two magnets 700, one for each of the front and rear portions of one actuator, So that a total of four magnets 700 are arranged.

In other words, since the number of the magnets 700 is reduced by half and the magnets 700 are not provided on the right and left sides, the magnetic interference phenomenon between adjacent magnets 700 can be reduced, It is possible to prevent a tilting phenomenon that occurs at the time of the vertical rise.

In the related art, when mounting the two actuators 410 and 420 close to the left and right, a mounting error of +/- 0.08 mm is generated. Therefore, a minimum distance of 0.025 mm is required between the lens transfer parts 400.

Therefore, when two actuators 410 and 420 are used as two bodies as in the prior art, the width becomes at least 17.03 mm.

The first actuator 410 and the second actuator 420 are formed in one lens transfer unit 400 and the first lens module 510 and the second lens module 520 The actuators 410 and 420 can be miniaturized for a dual camera only.

In addition, since the intermediate minimum interval 0.025 mm for mounting the two actuators 410 and 420, which is a disadvantage in the conventional technique, is not required and the size is 16.30 mm, The size can be reduced.

When a dual camera is mounted on a mobile, since the space (area) required for mounting the camera on the mobile is about twice as large as that of a single camera, the place for mounting the components other than the camera on the mobile becomes relatively narrow It is a constraint.

Therefore, if a single lens transfer unit 400 is used to minimize the size of the dual camera, it is possible to secure a minimum space of 0.67 mm for placing other components in a mobile environment.

In addition, since the present invention does not require a separate bracket (not shown), it is possible to further reduce the installation area as well as the volume.

FIG. 8A is a plan view of the lens transferring part 400 of the dual camera module to which the integrated VCM according to the present invention is applied, FIG. 8B is a cross- And the bottom of the lens transfer unit 400 to which the IR filter 600 of the camera module is coupled.

8A, a magnet 700 is formed only on the upper and lower portions of the first actuator 410 and the upper and lower portions of the second actuator 420, which are provided in the lens transfer unit 400.

A shielding member 800 may be provided between the first actuator 410 and the second actuator 420 to prevent a magnetic interference phenomenon between the coils wound around the actuators 410 and 420.

The shielding member 800 may use any one of SPCC (cold rolled steel sheet), permalloy, and megil. Preferably, SPCC is designed to have a thickness of 0.1T in order to prevent interference between the left and right magnets 700 .

8 (b), an IR filter 600 is coupled to the lower part of the lens transfer part 400 and is fastened to the upper part of the PCB 100. As shown in FIG.

Fig. 9 is a photograph showing a photographic area (red display portion) of 70 pixels.

The dual camera is equipped with two sensors and two lenses on a single substrate. The two cameras transmit two images from two sensors and two lenses to AP (Application Processor) such as mobile, tablet PC and tablet. And the image is processed by the image of the image.

However, due to the optical error caused by the mechanical error, the quality of the Fusing image was inferior in the process of processing one image.

However, according to the present invention, the mechanical mounting error can be reduced to +/- 0.08 mm, thereby reducing the optical error to 70 pixels (based on 1.12 um pixel).

The photographed area of 70 pixels is as shown in FIG. 9, and a clear difference is seen in comparison with FIG.

100: PCB 200: 1st image sensor
300: Second image sensor 400: Lens transfer
410: first actuator 420: second actuator
500: lens module part 510: first lens module
520: second lens module 600: IR filter
700: Magnet 800: Shielding member

Claims

A dual camera module to which a voice coil motor (VCM) including a first actuator and a second actuator for transferring the first lens module and the second lens module, respectively,
Wherein the first actuator and the second actuator are formed on a single body.

The present invention relates to a dual camera module to which a voice coil motor (VCM) is applied,
A PCB on which the first image sensor and the second image sensor are mounted;
A first actuator coupled to an upper portion of the PCB with the first image sensor disposed thereunder and a second actuator coupled to an upper portion of the PCB with the second image sensor disposed thereunder;
A lens module unit including a first lens module inserted and raised in the first actuator and a second lens module inserted and raised in the second actuator; And
And an IR filter coupled to the lower portion of the lens transfer portion and positioned between the lens transfer portion and the first and second image sensors,
Wherein the lens transfer unit is formed as one body.

The apparatus of claim 2, wherein the IR filter comprises:
Wherein the VCM is integrated with the dual camera module.

3. The method according to claim 1 or 2,
Wherein the magnet is formed only on the front and rear sides of the first actuator and the second actuator, respectively.

3. The apparatus according to claim 1 or 2, wherein between the first actuator and the second actuator,
And a shielding member is provided on the inner surface of the dual camera module.