KR102399097B1 - Camera module - Google Patents

Abstract

The present invention relates to a camera module, a cover can having a hole formed therein to allow light to pass through, and an inner space having an open lower portion, a base coupled to the lower side of the cover can, and an FPCB positioned in the inner space (Flexible Printed Circuit Board) and a ground portion provided on the FPCB and electrically contacting the cover can.
In the present invention, since the FPCB and the cover can are grounded, EMI shielding is possible, and the position of the hall sensor that detects the position of the bobbin can be visually determined through the grounding part exposed to the outside of the cover can.

Description

Camera Module {CAMERA MODULE}

The present invention relates to a camera module, and more particularly, to a camera module used in a mobile device or the like.

In general, various mobile communication terminals such as a cellular phone, a CDMA phone, and a PDA have network transmission and multimedia functions of daily information. In that regard, as image transmission becomes popular, photography is gradually becoming a part of mobile communication terminals. The advantage of using a palm-sized device with a built-in digital camera, such as PDAs and cellular phones, is that you can take pictures or send images at any time. Accordingly, the demand for mobile communication terminals in which the camera module is included is greatly increasing.

On the other hand, the general power frequency has a large effect on bioenergy, and thermal action is accompanied by a microwave-based mobile communication terminal or microwave oven. X-rays or gamma rays with very high frequencies have strong penetrating power and can cause fatal disturbances. Electromagnetic waves are a kind of electromagnetic energy generated from the flow of electricity and magnetism. In other words, when electricity flows, an electric field and a magnetic field are generated simultaneously around it, and they are periodically changed to create a wave. In particular, since the camera module is mounted on a portable terminal or a laptop computer that generates a lot of electromagnetic waves, and may cause malfunction due to electromagnetic waves, various research and development of technologies are being attempted to reduce the electromagnetic interference. In order to shield such electromagnetic interference (EMI), EMI shielding is being attempted through methods such as conductive inorganic materials, conductive polymers, organic/inorganic composites, and magnetic shielding.

However, the EMI shielding method as described above may increase the size of the camera module by adding a separate configuration, and by adding a separate manufacturing process, there is a problem in that the manufacturing cost of the camera module increases.
(Prior Document 1) KR10-2013-0047350 (2013.05.08)
(Prior Document 2) KR10-2012-0026186 (2012.03.19)
(Prior Document 3) KR10-2012-0029819 (2012.03.27)

The present invention is to solve the conventional problems as described above, and an object of the present invention is to provide a camera module that enables EMI shielding by grounding an FPCB and a cover can.

In order to achieve the object of the present invention as described above, the camera module according to the first embodiment of the present invention has a cover can having a hole formed therein to allow light to pass therethrough and an inner space having an open lower portion; and a base coupled to a lower side of the cover can; FPCB (Flexible Printed Circuit Board) located in the inner space; and a grounding unit provided on the FPCB and in electrical contact with the cover can.

In the camera module according to the first embodiment of the present invention, the ground portion may include one or more protrusions protruding outward from one side of the FPCB.

In the camera module according to the first embodiment of the present invention, the protrusion is a first protrusion located on one side of the FPCB; and a second protrusion positioned on the other side of the FPCB.

In the camera module according to the first embodiment of the present invention, the cover can may include an insertion groove into which the protrusion is inserted at one side.

In the camera module according to the first embodiment of the present invention, the protrusion may be press-fitted into the insertion groove.

In the camera module according to the first embodiment of the present invention, the protrusion may be inserted into the insertion groove and electrically connected to the cover can through conductive epoxy or soldering.

In the camera module according to the first embodiment of the present invention, the FPCB may be formed with an extension extending on one side to transmit an electrical signal to the outside.

In the camera module according to the first embodiment of the present invention, the printed circuit board disposed below the base; The FPCB may further include a terminal part electrically connected to the printed circuit board on one side.

In a camera module according to a first embodiment of the present invention, the camera module comprising: a cover can having a hole formed in the upper portion to allow light to pass through, and including an inner space having an open lower portion; a base coupled to a lower side of the cover can; and an FPCB located in the inner space, wherein the cover can and the FPCB may be grounded through mutual electrical contact.

In order to achieve the object of the present invention as described above, a camera module according to a second embodiment of the present invention includes: a cover can having a hole formed thereon so that light passes, and an inner space having an open lower portion; a base coupled to a lower side of the cover can; FPCB located in the inner space; and a grounding part provided on the cover can and contacting the FPCB, wherein the grounding part may electrically connect the FPCB and the cover can.

In the present invention, EMI shielding is possible because the FPCB and the cover can are grounded, and the FPCB is grounded to the printed circuit board to receive current.

In addition, the position of the hall sensor that detects the position of the bobbin can be visually determined through the grounding part exposed to the outside of the cover can.

1 is an exploded perspective view of a camera module according to a first embodiment of the present invention;
2 is a perspective view of a camera module according to a first embodiment of the present invention;
3 is a plan view of a camera module according to a first embodiment of the present invention.
4 is a perspective view showing the FPCB of the camera module according to the first embodiment of the present invention.
5 is a front view showing a state in which the grounding part and the cover can of the camera module according to the first embodiment of the present invention are grounded.
6 is a perspective view of a camera module according to a second embodiment of the present invention.

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

<First embodiment>

Referring to FIG. 1 , the lens driving motor according to the present embodiment may largely include a bobbin 100 , an AF coil 200 , a magnet 300 , and a housing 400 , and a stator 500 and first to first to It may further include a second elastic member (600, 610), an OIS spring (620), a base (700), a cover can (800). In addition, although not shown, the lens driving motor according to the present embodiment may further include a printed circuit board, an IR filter, an image sensor, and the like to configure the camera module.

The bobbin 100 may have a columnar shape with open top and bottom, and a hollow columnar shape is formed. In the hollow formed in the bobbin 100, a lens part (not shown) which is composed of one or more lenses and through which light passes is accommodated and screwed.

The AF coil (Auto Focusing Coil) 200 is wound on the outside of the bobbin 100 .

A plurality of magnets 300 may be disposed to face the AF coil 200 wound on the outside of the bobbin 100 . In addition, when a plurality of magnets 300 are arranged, a distance between the magnets 300 adjacent to each other may be arranged at equal intervals. When a current flows in the AF coil 200 , a magnetic field is formed in the AF coil 200 , and the magnet 300 raises and lowers the bobbin 100 up and down through electromagnetic interaction with the AF coil 200 .

The housing 400 is hollow and has upper and lower openings. The housing 400 accommodates the bobbin 100 , and the bobbin 100 may move up and down inside the housing 400 . The housing 400 includes plate-shaped ribs (not shown in the drawings) extending diagonally from one surface to the other adjacent surface on the inside of the corner. The space inside the edge of the housing 400 is divided into an upper portion and a lower portion by ribs. A magnet accommodating part is provided below the rib, and the magnet 300 is accommodated so that the lower surface of the rib and the upper surface of the magnet 300 contact each other. Although not shown in the drawings, the upper surface of the rib may be disposed to face the lower surface of the stopper formed from the outer surface of the bobbin 100 toward the outside.

The elastic member may be divided into a first elastic member 600 and a second elastic member 610 .

The first elastic member 600 is formed of a plate spring and disposed below the housing 400 . The first elastic member 600 has a hole through which light passes through the lens unit. The upper surface around the hole of the first elastic member 600 comes into contact with the lower side of the bobbin 100 to elastically support the bobbin 100 from the housing 400 .

The second elastic member 610 is disposed on the upper side of the housing 400 . The second elastic member 610 has a hole through which light passes through the lens unit. The lower surface around the hole of the second elastic member 610 comes into contact with the upper side of the bobbin 100 to elastically support the bobbin 100 from the housing 400 .

Since the first and second elastic members 600 and 610 elastically support the bobbin 100 that is raised and lowered by the magnet 300, the bobbin 100 moved along the optical axis direction can be returned to its original state. . Meanwhile, in the first embodiment, although the arrangement of the first and second elastic members 600 and 610 has been mentioned, the arrangement is not limited thereto and may be variously arranged according to a user's selection.

The base 700 has pillars 710 formed at each corner, the housing 400 is disposed inside the pillars 710, and the base 700 has an OIS spring 620 to move the housing 400 . support and support through Since the housing 400 supported by the base 700 has a gap with the pillar 710, it is possible to move horizontally by the gap distance. A hole through which light passing through the lens unit can pass is formed in the base 700 . A stator 500 and a first elastic member 600 are disposed between the base 700 and the housing 400, and the stator 500 may be an Optical Image Stabilization Coil (OIS) 510 and an FPCB 520. there is.

The OIS coil 510 is disposed below the first elastic member 600 . The OIS coil 510 is formed in a plate body, and a hole through which light passes through the lens unit is formed. A first elastic member 600 is disposed between the OIS coil 510 and the housing 400 . The OIS coil 510 faces the lower surface of the magnet 300 accommodated in the housing 400 with the through hole formed in the first elastic member 600 interposed therebetween. The OIS coil 510 performs a function of correcting a user's hand shake by horizontally moving the bobbin 100 and the housing 400 having the lens unit mounted thereon with respect to an image sensor to be described later. That is, when a current flows in the OIS coil 510, a magnetic field is formed in the OIS coil 510, and the housing 400 and the bobbin 100 accommodated in the housing 400 due to electromagnetic interaction with the magnet 300. move horizontally.

A flexible printed circuit board (FPCB) 520 applies power to the OIS coil 510 . The FPCB 520 is disposed below the OIS coil 510 . The FPCB 520 has a hole through which light passes through the lens unit. The FPCB 520 transmits the current supplied through the terminal formed on one side to the OIS coil 510 or an OIS spring 620 to be described later, and the current transmitted to the OIS spring 620 is the second elastic member 610 . It is supplied to the AF coil 200 through the AF coil 200 or the OIS coil 510 to form a magnetic field.

An OIS spring (Optical Image Stabilization Spring) 620 is disposed on the side of the housing 400 . The OIS spring 620 elastically supports the housing 400 with respect to the base 700 . The OIS spring 620 performs a function of returning the bobbin 100 and the housing 400, which have been moved in the horizontal direction with respect to the image sensor to be described later, to their original state by the magnetic field of the OIS coil 510 and the magnet 300 . In addition, although the OIS spring 620 is shown in the drawing as a leaf spring in the first embodiment, a suspension wire may be used as the OIS spring 620, and various selections are possible according to the user's intention, and this is not limited. does not

Although not shown in the drawings, in the camera module according to the present embodiment, a printed circuit board may be disposed below the base 700 . An image sensor that converts light passing through the lens unit into an electrical signal is mounted near the upper center of the printed circuit board. Components for operating the image sensor may be disposed on the printed circuit board, or a plurality of terminal units capable of supplying power and outputting information of the image sensor may be provided. In addition, an infrared cut filter for filtering infrared light before the light passing through the lens unit reaches the image sensor may be installed in the base 700 .

The cover can 800 is disposed outside the housing 400 to cover the above-mentioned components. A hole is formed in the cover can 800 to allow light to pass through the lens unit.

Referring to FIGS. 2 to 3 , an inner space 810 having an open lower portion is formed in the cover can 800 , and referring to FIG. 1 , the base 700 is coupled to the lower side of the cover can 800 .

The FPCB 520 may be located in the inner space 810 formed inside the cover can 800 . That is, the FPCB 520 may be disposed in the inner space 810 formed by the cover can 800 and the base 700 . In addition, as shown in FIG. 4 as an example, the FPCB 520 may include a rectangular main body 521 . However, the shape of the FPCB 520 is not limited thereto, and may be provided in any shape for supplying power to the OIS coil 510 or the AF coil 200 . The FPCB 520 is formed of an insulator, and a circuit through which an electrical signal is transmitted is formed.

As shown in FIG. 4 , the FPCB 520 may include a main body 521 , an extension part 522 , a terminal part 523 , and a ground part 525 .

The main body 521 is a substantially rectangular plate, and a hole through which light can pass is formed in the center.

An extension 522 may be provided to facilitate active alignment during the manufacturing process of the lens driving motor or camera module. The extension 522 extends from one side of the main body 521 and makes electrical contact with an external device, so that an electrical signal (eg, a hall-related signal, etc.) can be transmitted to the outside, and power can be applied to the AF coil. It may include a terminal with The extension 522 is in contact with an external device, so that it is possible to transmit a signal of a hall sensor (not shown in the drawing) that detects the position of the bobbin 100 to the outside. The extension 522 may be removed according to the user's selection.

The terminal part 523 is bent downward from one side of the main body 521 to extend, may be provided in plurality, and may be electrically connected to a printed circuit board disposed below the base 700 . The terminal part 523 is formed of an insulator like the main body 521 and a plurality of metal terminals 524 are formed to be spaced apart by a predetermined interval so as to be electrically connected to the printed circuit board.

The ground part 525 is provided in the FPCB and is in electrical contact with the cover can 800 . In other words, the ground portion 525 may include one or more protrusions 526 and 527 protruding outward from one side of the main body 521 of the FPCB 520 to be grounded with the cover can 800, and the protrusions are It may include a first protrusion 526 and a second protrusion 526 . In this embodiment, the protrusion as the grounding part 525 is illustrated and described as two first protrusions 526 and 526, but the number of the grounding parts 525 is varied according to the user's selection without being limited thereto. can be carried out Also, referring to FIG. 4 , the grounding part 525 is shown to protrude outwardly from the lower surface of the main body 521 in this embodiment, but this is the grounding part 525 according to the user's selection. may protrude outward from the upper surface of the, for example, the ground portion 525 may be electrically connected to the cover can 800 without protruding to the outside of the cover can 800 , and may be electrically connected to the cover can 800 . It can be formed into any possible shape. In addition, the ground portion 525 may be plated with gold plating or a conductive material for electrical connection with the cover can 800 .

According to this embodiment, the first protrusion 526 is located on one side of the main body 521 of the FPCB 520 , and the second protrusion 527 is located on the other side of the main body 521 of the FPCB 520 . , The first protrusion 526 and the second protrusion 527 are disposed in a diagonal direction to each other. In addition, according to a user's selection or design, the first protrusion 526 and the second protrusion 527 are exposed to the outside of the cover can 800 so that the user can visually estimate the location of the hall sensor.

Referring to FIG. 5 , the cover can 800 has an insertion groove 820 formed at a position corresponding to the ground portion 525 on one side, and the ground portion 525, that is, the first protrusion 526 and the second protrusion ( 527 are respectively inserted into the insertion grooves 820 and are grounded. At this time, the first protrusion 526 and the second protrusion 527 may be press-fitted into the insertion groove 820 , or the first protrusion 526 and the second protrusion 527 are inserted into the insertion groove 820 . The cover can 800 and the FPCB 520 may be electrically connected to each other by applying conductive epoxy or soldering. In addition, the cover can 800 may be provided with an avoidance portion (not denoted by a reference numeral) on one side so that the extension portion 522 of the FPCB 520 is exposed to the outside. Also, the FPCB 520 may be grounded with the printed circuit board of the camera module. That is, the cover can 800 may be grounded with the printed circuit board through the FPCB 520 . That is, on the circuit of the FPCB 520 , the ground unit 525 is electrically connected to the metal terminal 524 .

<Second embodiment>

In the second embodiment of the present invention, the same reference numerals are assigned to the same components as in the first embodiment, and descriptions overlapping those of the first embodiment will be omitted.

Referring to FIG. 6 , in the second embodiment, a ground part 830 is formed on one side of the cover can, and the ground part 830 comes into contact with a part of the terminal part 523 and is electrically connected, which is different from the first embodiment. there is In FIG. 6 , the grounding part 830 protrudes to the inside of the cover can 800 , and the grounding part 830 is grounded to the metal terminal 524 located at one end of the terminal 523 corresponding to the grounding part 830 . Although shown as being, it is possible to arrange various arrangements in which the cover can 800 and the terminal unit 523 can be grounded according to the user's selection.

What has been described above is only an embodiment for implementing the camera module according to the present invention, and the present invention is not limited to the above-described embodiment, and the present invention can be implemented without departing from the gist of the present invention as claimed in the following claims. Anyone with ordinary knowledge in the technical field to which it belongs will say that the technical spirit of the present invention exists to the extent that it can be implemented with various changes.

100: bobbin 200: AF coil
300: magnet 400: housing
500: stator 510: OIS coil
520: FPCB 521: main body
522: extension part 523: terminal part
524: metal terminal 525: grounding part
526: first protrusion 527: second protrusion
600: first elastic member 610: second elastic member
620: OIS spring 700: base
710: pillar 800: cover can
810: inner space 820: insertion groove
830: grounding part

Claims (10)

a cover can comprising a top plate and a side plate extending from the top plate;
a base disposed under the cover can;
FPCB (Flexible Printed Circuit Board) disposed on the upper surface of the base; and
It includes a printed circuit board disposed under the base,
The FPCB includes a terminal part electrically connected to the printed circuit board,
The side plate of the cover can includes a first grounding portion formed inside,
The first ground portion of the cover can is electrically connected to the terminal portion of the FPCB,
The FPCB includes a main body and a second grounding portion protruding outwardly of the main body,
The second ground portion includes a first protrusion disposed on one side of the FPCB and a second protrusion disposed on the other side of the FPCB,
and an insertion groove into which the second grounding part is press-fitted to one side of the cover can,
The second ground portion is exposed to the outside by the insertion groove camera module. According to claim 1,
The terminal part of the FPCB is formed to extend downward from the side of the main body. delete delete According to claim 1,
The second ground portion is inserted into the insertion groove and is electrically connected to the cover can through conductive epoxy or soldering. delete delete According to claim 1,
The FPCB includes an extension formed extending from the side of the main body,
The extension part is a camera module electrically connected to an external device. 9. The method of claim 8,
The cover can is a camera module including a groove formed in the side plate so that the extension is exposed to the outside. A mobile terminal comprising the camera module of claim 1.

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