TWI856075B - Camera module - Google Patents

Abstract

A camera module is disclosed. The camera module includes a lens unit including a liquid lens including a conductive liquid and a non-conductive liquid, a printed circuit board on which an image sensor aligned with the optical axis of the lens unit is disposed, a driving circuit disposed on the printed circuit board and configured to control the interface formed between the conductive liquid and the non-conductive liquid of the liquid lens, a gyro sensor disposed on the printed circuit board and configured to sense movement of the camera module, and a conductive driving signal line disposed on the printed circuit board and configured to transmit a signal output from the driving circuit to control the interface of the liquid lens. The conductive driving signal line is disposed so as not to overlap the gyro sensor in the vertical direction parallel to the optical axis.

Description

Photography module

Multiple embodiments of a photography module.

Users of portable devices require optical devices to have high resolution, be small, and have diverse camera functions. For example, the diverse camera functions may include an optical zoom function, an AF function, or at least one of a hand shake compensation function or an OIS function.

In conventional photographic modules, the aforementioned photographic function is achieved by combining multiple lenses and directly moving the combined lenses. However, this increase in the number of lenses can increase the size of the optical device.

The AF function and the OIS function are performed by tilting or moving a plurality of lenses, which are fixed to a lens holder and aligned with the optical axis in the direction of the optical axis or in a direction perpendicular to the optical axis. For this purpose, a separate lens drive device is used to drive the lens assembly composed of a plurality of lenses. However, this separate lens drive device consumes a lot of power, and in order to protect this drive device, it is necessary to additionally provide a cover glass independent of the photographic module, resulting in an increase in the overall size of the conventional photographic module. Therefore, research on a liquid lens that electrically adjusts the curvature of the interface between two liquids in order to perform the AF function and the OIS function has been carried out.

Conventional camera modules use a gyroscopic sensor to perform OIS. However, gyroscopic sensors are sensitive to noise.

An embodiment may provide a camera module in which a rotation sensor is less affected by noise.

However, the objectives achieved by this disclosure are not limited to the objectives set forth above, and other objectives not mentioned in this article can be easily understood by those familiar with this technology from the following description.

According to an embodiment, a photographic module may include: a lens unit, which includes a liquid lens, wherein the liquid lens includes a conductive liquid and a non-conductive liquid; a printed circuit board, on which an image sensor is mounted, wherein the image sensor is aligned with an optical axis of the lens unit; a driving circuit, which is disposed on the printed circuit board and is used to control an interface formed between the conductive liquid and the non-conductive liquid of the liquid lens; A rotary sensor is disposed on the printed circuit board, and the rotary sensor is used to sense the movement of the camera module; and a conductive drive signal circuit is disposed on the printed circuit board, and the conductive drive signal circuit is used to transmit a signal output by the drive circuit to control the interface of the liquid lens, and the conductive drive signal circuit is arranged so as not to overlap with the rotary sensor in a vertical direction parallel to the optical axis.

For example, the photographic module may further include a connecting portion for electrically connecting the liquid lens to the conductive drive signal circuit.

For example, on the printed circuit board, the driving circuit is arranged in the driving circuit area, and the driving circuit area can be arranged between the image area in which the image sensor is arranged and the rotating area in which the rotating sensor is arranged. Alternatively, on the printed circuit board, the rotating sensor is arranged in the rotating area, and the rotating area is arranged between the driving circuit area in which the driving circuit is arranged and the sensing area in which the image sensor is arranged.

For example, the liquid lens may include a common electrode electrically connected to the conductive liquid, and a plurality of individual electrodes electrically isolated from the common electrode, and the liquid lens is driven by the difference between a common voltage applied to the common electrode and individual voltages applied to the individual electrodes.

For example, the image region may include a central region in which the image sensor is disposed, a first terminal region in which a plurality of first terminals connected to a plurality of the individual electrodes are disposed, the first terminal region being positioned on one side of the central region, a second terminal region in which a plurality of second terminals connected to the remaining plurality of the individual electrodes are disposed, the second terminal region being positioned on an opposite side of the central region, and a third terminal region in which a third terminal connected to the common electrode is disposed.

For example, the driving circuit area may be arranged between the image area and the rotation area in a horizontal direction intersecting the vertical direction, and the driving circuit area may include a first side, in which the fourth to sixth terminals are arranged, the first side facing the image area, and a second side, forming an opposite side to the first side, the second side facing the rotation area, and wherein the conductive driving signal line may include a first connecting wire, electrically connecting some of the individual voltages provided by the fourth terminal to the first terminal, a second connecting wire, electrically connecting the remaining individual voltages provided by the fifth terminal to the second terminal, and a third connecting wire, electrically connecting the common voltage provided by the sixth terminal to the third terminal.

For example, the turning area may be disposed between the image area and the driving circuit area in a horizontal direction intersecting the vertical direction, and the conductive driving signal line may have a planar pattern such that the conductive driving signal line surrounds the turning area.

For example, the rotation area may include a first side facing the image area, a second side facing the drive circuit area and arranged relative to the first side, a third side disposed between the first side and the second side, and a fourth side arranged relative to the third side. The drive circuit area may include a first side in which the fourth to sixth terminals are arranged, the first side facing the first side of the rotation area, and the fourth to sixth terminals are arranged relative to the third side. On both sides, the conductive drive signal line may include a first connecting wire that electrically connects some of the individual voltages provided by the fourth terminal to the first terminal, a second connecting wire that electrically connects the remaining individual voltages provided by the fifth terminal to the second terminal; and a third connecting wire that electrically connects the common voltage provided by the six terminals to the third terminal.

For example, the first connecting wire may have a planar pattern such that the first connecting wire is separated from the third side of the turning area, and the second connecting wire may have a planar pattern such that the second connecting wire is separated from the fourth side of the turning area.

For example, the third connecting wire may have a planar pattern such that the third connecting wire is disposed adjacent to the first connecting wire or the second connecting wire.

The above overview and the detailed description of the contents disclosed in this case below are examples and explanations, and are intended to provide further explanation of the contents advocated.

20: Printed circuit board

22: Lens set

24: Control circuit

26: Image sensor

100: Photography module

144: First connecting substrate

146: Second connecting substrate

148: Insulation layer

150:Joint components

150: Board support feet

200: Photography module

200A: Photography module

200B: Photography module

210: Control circuit

220: Rotation sensor

230:Drive circuit

232: Controller

234: Voltage drive circuit

250: Lens set

260: Liquid lens unit

270: Driving voltage supply unit

280:Liquid lens

302: First terminal

304: First terminal

306: Second terminal

308: Second terminal

310: The third terminal

410: Pressurized state

420: Inactive state

510: Continuous pressure state

520: Inactive state

BO: Interface

CA: Cavity

CEA: Central Area

CL11: First connecting wire

CL12: First connecting wire

CL21: Second connecting wire

CL22: Second connecting wire

CL3: Third connecting wire

DA: Drive circuit area

E1: First electrode

E2: Second electrode

GA: Rotation Area

GS: Rotary sensor

i: Side wall

IA: Image area

LQ1: First Liquid

LQ2: Second liquid

LX: Optical axis

O1: First opening

O2: Second opening

P1: First plate

P2: Second board

P3: The third plate

S1: First side

S2: Second side

SS1: First side

SS2: Second side

SS3: Third side

SS4: Fourth side

T1: First terminal area

T2: Second terminal area

T4: The fourth terminal area

T5: Fifth terminal area

T41: The fourth one ends

T42: The fourth of the two ends

T51: The End of the Fifth

T52: The Fifth Second End

T6: Sixth terminal area

For those who are generally familiar with this technology, the above and other objects, features and advantages of the present invention will become more apparent by referring to the attached drawings which describe in detail the exemplary embodiments of the present invention, among which:

Figure 1 is a cross-sectional schematic diagram of a photographic module according to an embodiment;

Figure 2 is a cross-sectional view of a liquid lens unit according to an embodiment;

Figure 3 is a block diagram of a photography module according to an embodiment;

Figure 4 is a plan view of a photographic module according to an embodiment;

Figure 5 is a plan view of a photographic module according to another embodiment;

Figures 6A and 6B are waveform diagrams of a signal output by a rotary sensor in a photographic module according to a comparative example and an embodiment.

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

However, the technical spirit of the present invention is not limited to some exemplary embodiments disclosed below, but can be implemented in various different forms. Without departing from the technical spirit of the present invention, one or more of the components can be selectively combined and replaced for use between exemplary embodiments.

Furthermore, unless otherwise defined, the terms (including technical and scientific terms) used herein may be interpreted as having the same meaning as that generally understood by those skilled in the art to which the present invention belongs. General terms such as those defined in the dictionary may be interpreted in consideration of the contextual meaning of the relevant art.

In addition, the terms used herein are intended to illustrate exemplary embodiments, but are not intended to limit the present invention. In this specification, unless otherwise specified, terms in the singular may include plural forms. When expressing "at least one (or one or more) of A, B, and C", it may include one or more of all possible combinations of A, B, and C.

In addition, terms such as "first", "second", "A", "B", "(a)", and "(b)" may be used herein to describe components of exemplary embodiments of the present invention. Each of these terms is not intended to define the nature, order, or sequence of the corresponding component, but is only used to distinguish the corresponding component from other components.

Where a component is described as being "connected", "coupled" or "joined" to another component, this description includes both a component being "connected", "coupled" or "joined" directly to another component and a component being "connected", "coupled" or "joined" to another component with another component interposed therebetween.

Where any component is described as being formed or disposed "on (or below)" another component, this description includes both a situation where the two components are formed in direct contact with each other and a situation where the two components are in indirect contact with each other such that one or more other components are interposed between the two components. In addition, where a component is described as being formed "on (or below)" another component, this description may include a situation where one component is formed above or below the other component.

The variable lens may be a zoom lens. In addition, the variable lens may be a lens whose focal length can be adjusted. The variable lens may be at least one of a liquid lens, a polymer lens, a liquid crystal lens, a voice coil motor (VCM) type, or a shape memory alloy (SMA) type. The liquid lens may include a liquid lens containing a liquid and a liquid lens containing two liquids. The liquid lens containing a liquid can change the focal length by adjusting a diaphragm disposed at a position relative to the liquid, for example, by pressing the diaphragm using an electromagnetic force between a magnet and a coil. The liquid lens including two liquids may include a conductive liquid and/or a non-conductive liquid, and the interface formed between the conductive liquid and the non-conductive liquid may be adjusted using a voltage applied to the liquid lens. The polymer lens may change the focal length by controlling the polymer using a driving unit such as a piezoelectric actuator. The liquid crystal lens may change the focal length by controlling the liquid crystal using an electromagnetic force. The voice coil motor (VCM) type may change the focal length by using an electromagnetic force between a magnet and a coil to adjust a solid lens or a lens group including a solid lens. The shape memory alloy (SMA) type may change the focal length by using a shape memory alloy to control a solid lens or a lens group including a solid lens.

In the following, the photographic module according to the embodiment will be described with a variable lens including a liquid lens. However, the disclosure is not limited thereto. That is to say, the following description of the photographic module according to the embodiment can also be applied to a photographic module including any variable lens other than a liquid lens.

Hereinafter, the photographic modules 100, 200, 200A and 200B according to the embodiments will be described using a Cartesian coordinate system. However, the disclosure is not limited thereto. That is, although the X-axis, Y-axis and Z-axis of the Cartesian coordinate system are shown as being perpendicular to each other in the figure, the disclosure is not limited thereto. The X-axis, Y-axis and Z-axis may intersect each other instead of being perpendicular to each other.

FIG1 is a cross-sectional schematic diagram of a camera module 100 according to an embodiment.

Referring to FIG. 1 , the photographic module 100 may include a lens assembly 22, a control circuit 24 and an image sensor 26.

The lens assembly 22 may include at least one lens unit. The at least one lens unit may include a first lens, a second lens and a liquid lens unit (or a liquid lens module).

The control circuit 24 is used to control the lens unit (such as a liquid lens unit) and supply a driving voltage (or operating voltage) to drive the liquid lens unit. The control circuit 24 can be implemented in the form of an integrated circuit.

The image sensor 26 can be operated to convert light that has passed through at least one lens unit (such as a first lens, a liquid lens unit, and a second lens) into image data. More specifically, the image sensor 26 can convert light into an analog signal through a pixel array including a plurality of pixels, and can synthesize a digital signal corresponding to the analog signal to generate image data.

The control circuit 24 and the image sensor 26 mentioned above can be placed on a single printed circuit board. However, this is only an example, and the disclosed invention is not limited thereto.

When the photographic module 100 according to the embodiment is applied to an optical device (or optical instrument), the configuration of the control circuit 24 can be designed differently according to the specifications required by the optical device. Specifically, the control circuit 24 can be implemented as a single chip in the form of an integrated circuit.

The first lens may be disposed on the lens group 22, and may be an area on which light is incident from outside the lens group 22. The first lens may be implemented as a single lens, or may be implemented as two or more lenses, which are aligned with a central axis to form an optical system. Here, the central axis may be an optical axis LX in an optical system formed by the first lens, the liquid lens unit, and the second lens included in the photographic module 100, or may be an axis parallel to the optical axis LX. The optical axis LX may correspond to the optical axis of the image sensor 26. That is, the first lens, the liquid lens unit, the second lens, and the image sensor 26 may be arranged so as to be aligned with the optical axis LX through active alignment. Here, active alignment may be an operation of aligning the optical axis of each of the first lens, the second lens, and the liquid lens unit with the optical axis of the image sensor 26.

The second lens can be placed below the liquid lens unit. The second lens can be separated from the first lens in the optical axis direction (such as the Z axis direction).

Light incident on the first lens from outside the photographic module 100 can pass through the liquid lens unit and can be incident on the second lens. The second lens can be implemented as a single lens, or can be implemented as two or more lenses that are aligned with the central axis to form an optical system.

Different from the liquid lens unit, each of the first lens and the second lens may be a solid lens and may be formed of plastic. However, the present invention is not limited to a specific material of each of the first lens and the second lens.

FIG2 is a cross-sectional view of a liquid lens unit according to an embodiment.

The liquid lens unit shown in FIG. 2 may include a first connection substrate 144 (or a separate electrode connection substrate), a liquid lens (or a liquid lens) and a second connection substrate 146 (or a common electrode connection substrate). The connection portion of the liquid lens unit may be used to electrically connect a printed circuit board to the liquid lens, and may include first and second connection substrates 144 and 146.

The liquid lens may include a plurality of different types of liquids (LQ1, LQ2), first to third plate portions (P1, P2, P3), first and second electrodes (E1, E2) and an insulating layer 148.

The liquids (LQ1, LQ2) may be contained in the cavity CA and may include a conductive first liquid LQ1 (also referred to as a "conductive liquid") and a non-conductive second liquid LQ2 (also referred to as an "insulating liquid" or "non-conductive liquid"). The first liquid LQ1 and the second liquid LQ2 may not mix, and an interface BO may be formed at the contact portion between the first liquid LQ1 and the second liquid LQ2. For example, the first liquid LQ1 may be placed on the second liquid LQ2, but the disclosure is not limited thereto.

The inner surface of the first plate portion P1 may constitute the side wall i of the cavity CA. The first plate portion P1 may include upper and lower openings having a predetermined inclined surface. That is, the cavity CA may be defined as an area surrounded by the inclined surface i of the first plate portion P1, the first opening contacting the second plate portion P2, and the second opening contacting the third plate portion P3.

The larger opening diameter of the first opening and the second opening may be different according to the required field of view (FOV) of the liquid lens or the role of the liquid lens in the imaging module 100. According to this embodiment, the size (area or width) of the first opening O1 may be larger than the size (area or width) of the second opening O2. Here, the size of each of the first opening and the second opening may be the cross-sectional area in the horizontal direction (such as the X-axis and the Y-axis). For example, when each of the first opening and the second opening has a circular cross-section, its size may be the radius, and when each of the first opening and the second opening has a square cross-section, its size may be the diagonal length.

Each of the first opening and the second opening may have a hole shape with a circular cross section. The interface BO formed between the two liquids may be moved along the inclined surface i of the cavity CA by applying a driving voltage to the liquid lens.

The first liquid LQ1 and the second liquid LQ2 may be filled, contained or placed in the cavity CA in the first plate portion P1. In addition, the cavity CA is a portion through which the light that has passed through the first lens passes. Therefore, the first plate portion P1 may be formed of a transparent material, or may include impurities so that light does not easily penetrate.

The electrodes can be disposed on one and another surface of the first plate portion P1, respectively. The plurality of first electrodes E1 can be separated from the second electrode E2 and can be disposed on one surface (such as the bottom surface, the side surface and the top surface) of the first plate portion P1. The second electrode E2 can be disposed on at least a portion of another surface (such as the top surface) of the first plate portion P1 and can directly contact the first liquid LQ1.

In addition, the first electrode E1 can be implemented as a plurality of electrodes (hereinafter referred to as "individual electrodes"), and the second electrode E2 can be implemented as a single electrode (hereinafter referred to as "common electrode").

A portion of the second electrode E2 disposed on another surface of the first plate portion P1 can be exposed to the first liquid LQ1, which is conductive.

Each of the first and second electrodes E1 and E2 may be formed of a conductive material.

In addition, the second plate portion P2 can be disposed on one surface of the second electrode E2. That is, the second plate portion P2 can be disposed on the first plate portion P1. Specifically, the second plate portion P2 can be disposed on the top surface of the second electrode E2 and the cavity CA.

The liquid lens unit in FIG. 2 may further include a bonding member (or adhesive) 150. The bonding member 150 may be disposed between the first plate portion P1 and the second plate portion P2, and may function to bond the first plate portion P1 and the second plate portion P2 to each other.

Alternatively, the liquid lens unit in FIG. 2 may further include a plate support 150 instead of the joint member 150. The plate support 150 is disposed between the first plate portion P1 and the second plate portion P2 and is used to support the second plate portion P2. Here, the plate support 150 may be made of the same material as the second plate portion P2 and may be formed integrally therewith.

The third plate portion P3 may be disposed on one surface of the first electrode E1. That is, the third plate portion P3 may be disposed below the first plate portion P1. Specifically, the third plate portion P3 may be disposed on the bottom surface of the first electrode E1 and below the cavity CA.

The second plate portion P2 and the third plate portion P3 may be arranged opposite to each other, with the first plate portion P1 inserted therebetween. At least one of the second plate portion P2 or the third plate portion P3 may be omitted.

At least one of the second plate portion P2 or the third plate portion P3 may have a rectangular flat plate shape. Each of the second and third plate portions P2 and P3 may be a region through which light passes, and may be made of a light-transmitting material. For example, each of the second and third plate portions P2 and P3 may be made of glass. For the convenience of the manufacturing process, each of the second and third plate portions P2 and P3 may be made of the same material as each other.

According to one embodiment, light from the first lens may be incident on the second plate portion P2. That is, in the cavity CA, the area of the first opening oriented in the direction of light incidence may be larger than the area of the second opening oriented in the opposite direction. To this end, the second plate portion P2 may have a configuration that allows light to travel through the cavity CA. The third plate portion P3 may have a configuration that allows light that has passed through the cavity CA in the first plate portion P1 to travel toward the second lens.

According to another embodiment, light may be incident from the first lens onto the third plate portion P3. That is, in the cavity CA, the area of the second opening oriented in the direction of light incidence may be smaller than the area of the first opening oriented in the opposite direction. To this end, the third plate portion P3 may have a configuration that allows light to travel through the cavity CA. The third plate portion P3 may have a configuration that allows light that has passed through the cavity CA in the first plate portion P1 to travel toward the second lens. The second plate portion P2 may have a configuration that allows light that has passed through the cavity CA in the first plate portion P1 to travel toward the second lens.

The second plate portion P2 can directly contact the first liquid LQ1.

The insulating layer 148 may be disposed so as to cover a portion of the top surface of the third plate portion P3 below the cavity CA. That is, the insulating layer 148 may be disposed between the second liquid LQ2 and the third plate portion P3.

In addition, the insulating layer 148 may be arranged to cover a portion of the first electrode E1 constituting the side wall of the cavity CA. In addition, the insulating layer 148 may be arranged to cover a portion of the second electrode E2, the first plate portion P1, and the first electrode E1 on the top surface of the first plate portion P1. Therefore, the insulating layer 148 can prevent the contact between the first electrode E1 and the first liquid LQ1 and the contact between the first electrode E1 and the second liquid LQ2.

The insulating layer 148 may cover one of the first and second electrodes E1 and E2 (such as the first electrode E1), and may expose a portion of the other (such as the second electrode E2), and electrical energy may be applied to the conductive first liquid LQ1.

The first connecting substrate 144 can electrically connect the plurality of first electrodes E1 included in the liquid lens to the motherboard (not shown). The second connecting substrate 146 can electrically connect the second electrode E2 of the liquid lens to the motherboard. To this end, the first connecting substrate 144 can be implemented as a flexible circuit board, and the second connecting substrate 146 can be implemented as a flexible circuit board or a single metal substrate (or a conductive metal plate).

The first connection substrate 144 can be electrically connected to the electrode pads formed on the motherboard by being electrically connected to the connection pads of each of the plurality of first electrodes E1.

The second connection substrate 146 can be electrically connected to the electrode pad formed on the motherboard by being electrically connected to the connection pad of the second electrode E2.

The motherboard may include a recess and a circuit element (not shown), and the recess may be used to mount, seat, closely set, fix, temporarily fix, support, couple or accommodate the image sensor 26. The circuit element of the motherboard may constitute a control module, which controls the liquid lens unit and the image sensor. Here, the control module may be described later with reference to FIG. 3. The circuit element may include at least one of a passive element or an active element, and may have various areas and heights.

The motherboard may be implemented as a rigid-flexible circuit board (RFPCB) including a flexible circuit board. The flexible circuit board may be bent according to the space required for installing the camera module 100.

The driving of the liquid lens configured as described above will be described in detail below.

The first connection substrate 144 and the second connection substrate 146 function to supply a driving voltage for driving the liquid lens to the first and second electrodes E1 and E2, respectively. When the driving voltage is applied to the first and second electrodes E1 and E2 through the first connection substrate 144 and the second connection substrate 146, the interface BO between the first liquid LQ1 and the second liquid LQ2 can be deformed, and at least one of the shape (such as curvature), focal length or tilt angle of the liquid lens can be changed (or adjusted). For example, the focal length of the liquid lens can be adjusted as the interface BO formed in the liquid lens changes according to at least one of the bending or tilting of the driving voltage. In this way, when the deformation, curvature radius and tilt angle of the interface BO are controlled, the photography module 100 including the liquid lens can perform the AF function and the hand shake compensation or OIS function.

For example, the first connection substrate 144 can transmit four different individual voltages, namely the first to fourth individual voltages to the liquid lens, and the second connection substrate 146 can transmit a common voltage to the liquid lens. The common voltage may include a direct current (DC) voltage or an alternating current (AC) voltage. When the common voltage is applied in the form of a pulse, the width of the pulse or its duty cycle may be constant.

The liquid lens can be driven by the difference between a common voltage applied to a common electrode and a plurality of individual voltages applied to a plurality of individual electrodes.

Multiple individual voltages supplied through the first connection substrate 144 can be applied to a plurality of first electrodes E1 exposed at respective corners of the liquid lens.

Although not shown, the conductive epoxy resin may be disposed between the first connection substrate 144 and the plurality of first electrodes E1 so that the first connection substrate 144 and the plurality of first electrodes E1 may be in contact, coupled and electrically connected to each other. In addition, the conductive epoxy resin may be disposed between the second connection substrate 146 and the second electrode E2 so that the second connection substrate 146 and the second electrode E2 may be in contact, coupled and electrically connected to each other. .

In the following, the control process of the photographic module 200 according to an embodiment will be described.

FIG3 is a block diagram of a photographic module 200 according to an embodiment.

Referring to FIG. 3 , the photographic module 200 may include a control circuit 210 and a lens group 250. The control circuit 210 may correspond to the control circuit 24 of FIG. 1 , and the lens group 250 may correspond to the lens group 22 of FIG. 1 . Specifically, the control circuit 210 corresponds to the control module mentioned above.

The control circuit 210 may control the operation of the liquid lens unit including the liquid lens 280. To this end, the control circuit 210 may include a rotary sensor 220 and a drive circuit 230. The control circuit 210 may have a configuration for performing AF and OIS functions, and may control the liquid lens 280 included in the lens group 250 based on user demand or sensing results (such as a dynamic signal of the rotary sensor 220). Here, the liquid lens 280 may correspond to the liquid lens shown in FIG. 2.

The rotation sensor 220 may be an independent component not included in the control circuit 210, or may be included in the control circuit 210.

The rotation sensor 220 can sense the rotational angular velocity moving in two directions (i.e., the yaw-axis direction and the pitch-axis direction) to compensate for the movement of the camera module 100 or 200 or the optical device including the camera module 100 or 200 in the up-down direction and the left-right direction (i.e., shaking or hand shaking). The rotation sensor 220 can generate a dynamic signal corresponding to the sensed rotational angular velocity, and can provide the dynamic signal to the driving circuit 230.

The driving circuit 230 can be used to control the interface BO formed between the two liquids LQ1 and LQ2, and can include a controller 232 and a voltage driving circuit 234.

In order to realize the OIS function, the controller 232 can remove high-frequency noise from the dynamic signal using a low-pass filter (LPF) to extract only the components in the desired band, and can use the dynamic signal with noise removed to calculate the total hand shake, and can calculate the driving voltage corresponding to the shape that the liquid lens 280 of the liquid lens module 260 needs to have to compensate for the calculated total hand shake.

The controller 232 can receive information (information about the distance to the object) for performing the AF function from inside the optical device or the photographic module 100 or 200 (such as the image sensor 26) or outside thereof (such as the distance sensor or the application processor), and can use the distance information to calculate the driving voltage corresponding to the shape that the liquid lens 280 needs to have according to the focal length of the focusing lens on the object.

The controller 232 can store a driving voltage table, which graphically displays the driving voltage and the driving voltage code that causes the voltage driving circuit 234 to generate the driving voltage. The driving voltage code corresponding to the calculated driving voltage can be obtained by referring to the driving voltage table, and the obtained driving voltage code can be output to the voltage driving circuit 234.

The voltage driving circuit 234 can receive a digital driving voltage code from the controller 232, generate an analog driving voltage corresponding to the received driving voltage code, and provide the analog driving voltage to the lens assembly 250.

The voltage driving circuit 234 may include a booster for receiving a supply voltage (such as a voltage supplied by an independent voltage supply circuit) and increasing the voltage level, a voltage regulator for stabilizing the output power of the booster, and a switching unit for selectively supplying the output power of the booster to respective terminals of the liquid lens 280.

Here, the switching unit may include a circuit called an H bridge. The high voltage output power from the booster is applied to the switching unit as a supply voltage. The switching unit may selectively cross the two ends of the liquid lens 280 to supply the applied supply voltage and the ground voltage. Here, as described above, the liquid lens 280 may include four first electrodes E1, a first connecting substrate 144, a second electrode E2 and a second connecting substrate 146 to achieve driving. The two ends of the liquid lens 280 may be any one of the plurality of first electrodes E1 and the second electrode E2. Alternatively, the two ends of the liquid lens 280 may be any one of the four first electrodes E1 and the second electrode E2.

A pulse voltage with a predetermined width may be applied to each electrode of the liquid lens 280, and the driving voltage applied to the liquid lens 280 may be the difference between the voltage applied to each first electrode E1 and the voltage applied to the second electrode E2.

In addition, in order for the voltage driving circuit 234 to control the driving voltage applied to the liquid lens 280 according to the digital driving voltage code provided by the controller 232, the booster controls the increase of the voltage level, and the switching unit controls the phase of the pulse voltage applied to the common electrode and multiple individual electrodes, thereby outputting an analog driving voltage corresponding to the driving voltage code.

That is, the control circuit 210 can control the voltage applied to the first electrode E1 and each second electrode E2. In addition, the control circuit 210 can further include a connector (not shown) that performs a communication or interface function of the control circuit 210. For example, the connector can perform a communication protocol conversion to achieve communication between the control circuit 210 (using an integrated circuit bus I ² C transmission system) and the lens assembly 250 (using a mobile industry processor interface (MIPI) transmission system).

The lens assembly 250 may include a liquid lens unit 260, and the liquid lens unit 260 may include a driving voltage supply unit 270 and a liquid lens 280. Here, the liquid lens unit may correspond to the liquid lens unit shown in FIG. 2 described above.

The driving voltage supply unit 270 can receive the driving voltage from the voltage driving circuit 234 and supply the driving voltage to the liquid lens 280. Here, the driving voltage can be an analog driving voltage applied to any one of a plurality of individual electrodes and a common electrode.

The driving voltage supply unit 270 may include a noise removal circuit (not shown) or a voltage modulation circuit (not shown) to compensate for the loss caused by the terminal connection between the control circuit 210 and the lens assembly 250, or to shunt the voltage supplied by the voltage driving circuit 234 to the liquid lens 280.

The liquid lens 280 can perform at least one of the AF and OIS functions by deforming the interface BO between the first liquid LQ1 and the second liquid LQ2 according to the driving voltage.

The rotation sensor 220 shown in FIG. 3 may be sensitive to noise.

In the following, various configurations of the photographic module according to the embodiment will be described with reference to FIG. 4 and FIG. 5 .

FIG. 4 is a plan view of a photographic module 200A according to one embodiment, and FIG. 5 is a plan view of a photographic module 200B according to another embodiment.

Although the camera modules 200A and 200B shown in FIG. 4 and FIG. 5 are described in accordance with the embodiments corresponding to the camera modules 100 and 200 shown in FIG. 1 and FIG. 3 , the disclosed embodiments are not limited thereto. That is, according to other embodiments, the camera modules 200A and 200B shown in FIG. 4 and FIG. 5 may also be applied to camera modules having configurations different from the camera modules 100 and 200 shown in FIG. 1 and FIG. 3 .

Each of the photographic modules 200A and 200B shown in FIG. 4 and FIG. 5 may include a printed circuit board 20, a lens unit including a liquid lens 280, a driving circuit, a rotary sensor GS, and a conductive driving signal line.

The printed circuit board 20, the liquid lens 280, the rotary sensor GS and the image sensor 26 are described in each of FIG. 4 and FIG. 5 as having a rectangular flat plate shape, but the disclosure is not limited thereto. That is, the printed circuit board 20, the liquid lens 280, the rotary sensor GS and the image sensor 26 can have any variety of flat plate shapes.

In addition, the image sensor 26 is described in each of FIG. 4 and FIG. 5 as having a larger plane area than the liquid lens 280, but the disclosure is not limited thereto. That is, according to other embodiments, the plane area of the image sensor 26 may be equal to or smaller than the plane area of the liquid lens 280.

In addition, although the liquid lens 280 is not disposed on the printed circuit board 20, the liquid lens 280 is depicted using dashed lines in each of FIG. 4 and FIG. 5 to provide a better understanding of the disclosed invention.

The printed circuit board 20 shown in each of FIG. 4 and FIG. 5 may correspond to the mainboard described above, and the image sensor 26, the drive circuit, the rotary sensor GS and the conductive drive signal line may be arranged on the printed circuit board 20.

The printed circuit board 20 may include an image area IA, a rotation area GA and a drive circuit area DA.

The image area IA can be defined as an area in which the lens unit and the image sensor 26 arranged along the optical axis LX are placed. Here, the lens unit may include the liquid lens unit (such as 260) described above with reference to Figures 2 and 3, and may further include the first and second lenses. In particular, the liquid lens 280 may correspond to the liquid lens shown in Figures 2 and 3, but the disclosure is not limited thereto. In addition, the image sensor 26 may be aligned with the optical axis LX of the lens unit including the liquid lens 280, and may correspond to the image sensor 26 shown in Figure 1.

The image area IA may include a central area CEA and first and second terminal areas T1 and T2. The central area CEA may be defined as an area where the image sensor 26 is disposed. The first terminal area T1 may be defined as an area located on one side of the central area CEA (such as a region located above the central area CEA), and wherein a plurality of first terminals (such as 302 and 304) connected to a plurality of electrodes among a plurality of individual electrodes are disposed. In addition, the second terminal area T2 may be defined as an area located on the opposite side of the central area CEA (such as a region located below the central area CEA), and wherein a plurality of second terminals (such as 306 and 308) connected to other electrodes among a plurality of individual electrodes are disposed.

For example, when the plurality of individual electrodes include first to fourth individual electrodes, the first terminal in the first terminal region T1 may be connected to the third and fourth individual electrodes, and the second terminal in the second terminal region T2 may be connected to the first and second individual electrodes.

In addition, the image area IA may further include a third terminal area in which a third terminal is disposed. The third terminal may be connected to a common electrode. Although the third terminal area in FIGS. 4 and 5 is shown as being included in the second terminal area T2, the disclosure is not limited thereto. That is, the third terminal area may be included in the first terminal area T1, or may be provided independently of the first and second terminal areas T1 and T2.

The rotation area GA can be defined as an area where the rotation sensor GS is placed to sense the movement (shake or hand shake) of the camera module 200A or 200B or the optical device including the camera module 200A or 200B. Here, the rotation sensor GS can correspond to the rotation sensor 220 shown in FIG. 3. The rotation area GA, the image area IA and the drive circuit area DA can be arranged on the printed circuit board 20 and separated from each other in a plan view.

A driving circuit (not shown) for controlling and driving a lens unit (such as a liquid lens unit) may be placed in the driving circuit area DA. Here, the driving circuit may correspond to the driving circuit 230 shown in FIG. 3.

In addition, the conductive drive signal line (such as CL11 to CL3) is arranged on the printed circuit board 20, and serves to transmit the signal output from the drive circuit arranged in the drive circuit area DA to control the interface BO of the liquid lens 280. For this purpose, the conductive drive signal line (such as CL11 to CL3) can electrically connect the drive circuit to the lens unit, that is, to the liquid lens 280. In other words, the connection portion (such as the connection substrates 144 and 146 shown in FIG. 2) can electrically connect the liquid lens 280 to the conductive drive signal line (such as CL11 to CL3).

In this case, the conductive drive signal lines (such as CL11 to CL3) can be arranged so as not to overlap with the rotary sensor GS (or the rotary area GA) in a vertical direction (such as the Z-axis direction) parallel to the optical axis LX.

The photographic module 200A according to one embodiment will be described with reference to FIG. 4 .

According to one embodiment, as shown in FIG. 4 , the driving circuit area DA can be disposed between the image area IA and the rotation area GA in a horizontal direction (such as an x-axis direction or a y-axis direction) intersecting a vertical direction (such as a z-axis direction).

The driving circuit area DA may include first and second side portions S1 and S2. The first side portion S1 may face the image area IA, and the fourth to sixth terminals T4 to T6 may be disposed in the first side portion S1. The second side portion S2 may face the turning area GA and may be positioned opposite to the first side portion S1.

The conductive drive signal circuit may include first to third connecting wires.

The first connection wire serves to electrically connect some of the individual voltages provided by the fourth terminal T4 among the plurality of individual voltages to the first terminal in the first terminal area T1. For example, the first connection wire may include first one and first two connection wires CL11 and CL12. Among the plurality of individual voltages (such as the first to fourth individual voltages), the first one connection wire CL11 may electrically connect the fourth individual voltage provided by the fourth one terminal T41 to one terminal 302 among the plurality of first terminals in the first terminal area T1. Among the plurality of individual voltages (such as the first to fourth individual voltages), the first two connecting wires CL12 can electrically connect the third individual voltage provided by the fourth two terminals T42 to another terminal 304 among the plurality of first terminals in the first terminal region T1.

The second connection wire serves to electrically connect other individual voltages among the plurality of individual voltages provided by the fifth terminal T5 to the second terminal in the second terminal area T2. For example, the second connection wire may include second-one and second-two connection wires CL21 and CL22. Among the plurality of individual voltages (such as the first to fourth individual voltages), the second-one connection wire CL21 may electrically connect the second individual voltage provided by the fifth-one terminal T51 to one terminal 306 among the plurality of second terminals in the second terminal area T2. Among the plurality of individual voltages (such as the first to fourth individual voltages), the second second connection wire CL22 can electrically connect the first individual voltage provided by the fifth second terminal T52 to another terminal 308 among the plurality of second terminals in the second terminal region T2.

The third connection wire CL3 can electrically connect the common voltage provided by the sixth terminal T6 to the third terminal. As shown in FIG. 4 , since the third terminal region is included in the second terminal region T2, the third connection wire CL3 can be electrically connected to the third terminal 310 in the second terminal region T2.

The photographic module 200B according to another embodiment will be described with reference to FIG5 .

Different from FIG. 4 , according to another embodiment shown in FIG. 5 , the rotation area GA can be disposed between the image area IA and the drive circuit area DA on the printed circuit board 20 in a horizontal direction (such as the x-axis direction or the Y-axis direction) intersecting the vertical direction (such as the Z-axis direction). Except that the plane configuration of the rotation area GA and the drive circuit area DA is different from that of FIG. 4 , the camera module 200B shown in FIG. 5 is the same as the camera module 200A shown in FIG. 4 .

The turnaround area GA may include first to fourth side sides SS1 to SS4. The first side side SS1 may be defined as a side facing the image area IA, and the second side side SS2 may be defined as a side facing the drive circuit area DA and opposite to the first side side SS1. The third side side SS3 may be defined as a side formed between the first side side SS1 and the second side side SS2, and the fourth side side SS4 may be defined as a side opposite to the third side side SS3.

The driving circuit area DA may include a first side S1. The first side S1 may face the second side SS2 of the turn area GA, and the fourth to sixth terminals T4 to T6 may be disposed in the first side S1.

The conductive drive signal lines CL11 to CL3 shown in FIG. 4 may include first to third connecting wires CL11 to CL3. The configuration of the first to third connecting wires CL11 to CL3 electrically connected to the first to third terminals in the image area IA is the same as described above with reference to FIG. 4.

That is, the first connecting wires CL11 and CL12 electrically connect some of the individual voltages provided by the fourth terminal T4 (T41 and T42) to the first terminals 302 and 304 in the first terminal area T1. The second connecting wires CL21 and CL22 electrically connect other individual voltages provided by the fifth terminal T5 (T51 and T52) to the second terminals 306 and 308 in the first terminal area T2. The third connecting wire CL3 electrically connects the common voltage provided by the sixth terminal T6 to the third terminal 310 in the third terminal area T2.

However, unlike the conductive drive signal lines shown in FIG. 4 , the conductive drive signal lines CL11 to CL22 shown in FIG. 5 have a planar pattern and thus surround the turnaround area GA. This is because, unlike FIG. 4 , the 200B shown in FIG. 5 is configured so that the turnaround area GA is positioned between the drive circuit area DA and the image area IA.

For example, the first connecting wires CL11 and CL12 may have a planar pattern and thus be separated from the third side SS3 of the turning area GA, and the second connecting wires CL21 and CL22 may have a planar pattern and thus be separated from the fourth side SS4 of the turning area GA. In a planar view, the more the spacing between the first connecting wires CL11 and CL12 and the third side SS3 of the turning area GA increases, the less the rotating sensor GS is affected by noise, and the more the spacing between the second connecting wires CL21 and CL22 and the fourth side SS4 of the turning area GA increases, the less the rotating sensor GS is affected by noise.

In addition, the third connecting wire CL3 may have a planar shape and thus be disposed adjacent to the first connecting wires CL11 and CL12 or the second connecting wires CL21 and CL22. For example, as shown in FIGS. 4 and 5 , the third connecting wire CL3 may have a planar shape and thus be disposed adjacent to the second connecting wires CL21 and CL22.

In the following, the photographic module according to the comparative example and the photographic module according to the embodiment will be described with reference to the accompanying drawings.

6A and 6B are waveform diagrams of signals output by the rotary sensor 220 or GS in a photographic module according to a comparative example and an embodiment. In each diagram, the horizontal axis represents time, and the vertical axis represents degree.

Generally, the gyro sensor 220 or GS is very sensitive to electrical and mechanical noises in its surroundings. Therefore, depending on the configuration of the gyro sensor 220 or GS, the image sensor 26, and the drive circuit on the printed circuit board 20, external noise may act on the gyro sensor 220 or GS, and the signal sensed by the gyro sensor 220 or GS may fluctuate, thereby degrading the OIS performance of the camera module. In addition, a high voltage (such as 70 volts) may be applied to the liquid lens through a conductive drive signal line connecting the drive circuit to the liquid lens, and a signal with a high-frequency component may be transmitted to the liquid lens through the conductive drive signal line.

In the case of the photographic module according to the comparative example, the conductive drive signal line overlaps with the rotating area GA (or the rotating sensor) in the vertical direction (such as the Z-axis direction) parallel to the optical axis LX. Therefore, as shown in FIG. 6A, in the state of applying pressure 410 on the liquid lens, that is, in the state of applying the drive voltage to the liquid lens, the rotating sensor GS is affected by noise, and therefore, the signal output from the rotating sensor GS has a swing width that is approximately twice greater than the swing width of the liquid lens in the non-driven inactive state 420.

On the other hand, in the case of the camera module according to the embodiment, the conductive drive signal lines (such as CL11 to CL3) are arranged so as not to overlap the rotation area GA (or the rotation sensor) in the vertical direction (such as the Z-axis direction) parallel to the optical axis LX. That is, as shown in FIG. 4, since the image area IA and the drive circuit area DA are arranged so as to be directly opposite to each other, the conductive drive signal lines (such as CL11 to CL3) do not overlap the rotation area GA (or the rotation sensor) in the vertical direction (such as the Z-axis direction) parallel to the optical axis LX. Alternatively, as shown in FIG. 5 , although the rotation area GA is positioned between the image area IA and the driving circuit area DA, the conductive driving signal lines CL11 to CL22 have a planar pattern and thus surround the rotation area GA, and thus the conductive driving signal lines (such as CL11 to CL3) do not overlap with the rotation area GA (or the rotating sensor) in a vertical direction (such as the Z-axis direction) parallel to the optical axis LX. Therefore, as shown in FIG. 6B , the swing width in the boosted-on state 510 is almost unchanged and is similar to the swing width in the inactive state 520.

Although only a few embodiments are described above, various other embodiments are possible. The technical contents of the embodiments described above can be combined into various forms as long as there is no incompatibility between them, and can be implemented in new embodiments.

The above-described photographic modules 100, 200, 200A and 200B according to the embodiments can be used to implement an optical device (or optical instrument). Here, the optical device may include a device capable of processing or analyzing an optical signal. Examples of such optical devices may include a camera/video camera device, a telescopic device, a microscope device, an interferometer, a photometer, a polarimeter, a spectrometer, a reflectometer, an autocollimator and a focal meter, and the embodiments may be applied to an optical instrument including a lens set.

In addition, the optical device can be implemented on a portable device such as a smart phone, a laptop or a tablet computer. Such an optical device may include a camera module 100, 200, 200A or 200B, a display unit (not shown) for outputting images, a battery pack (not shown) for providing power to the camera module 100, 200, 200A or 200B, and a housing in which the camera module 100, 200, 200A or 200B, the display unit and the battery pack are installed. The optical device may further include a communication module that can communicate with other devices and a memory that can store data. The communication module and the memory may be installed in the housing.

As shown in the above description, since the rotating sensor is less affected by noise, the camera module according to the present disclosure can perform an improved OIS function.

However, the effects achieved through this disclosure are not limited to those described above. For those familiar with the art, other effects not mentioned in this article can be easily understood by those familiar with the art.

The embodiments have been described with reference to many illustrative embodiments thereof, but it will be appreciated that numerous other modifications and embodiments may be devised by those skilled in the art that will fall within the spirit and scope of the principles of the invention. More particularly, there may be various variations and modifications of the components and/or configurations of the subject combination configurations that fall within the scope of the disclosure, drawings, and appended claims. In addition to variations and modifications of the components and/or configurations, alternative uses will also be apparent to those skilled in the art.

22: Lens set

24: Control circuit

26: Image sensor

100: Photography module

Claims (10)

A photographic module comprises: a lens unit comprising a liquid lens, wherein the liquid lens comprises a conductive liquid and a non-conductive liquid; a printed circuit board on which an image sensor is mounted, wherein the image sensor is aligned with an optical axis of the lens unit; a driving circuit for controlling an interface formed between the conductive liquid and the non-conductive liquid of the liquid lens, wherein the driving circuit is mounted on the printed circuit board; a rotary sensor mounted on the printed circuit board; The invention relates to a printed circuit board, wherein the rotary sensor is used to sense the movement of the camera module; and a conductive drive signal circuit is arranged on the printed circuit board, wherein the conductive drive signal circuit is used to transmit a signal output by the drive circuit to control the interface of the liquid lens, wherein the conductive drive signal circuit is arranged so as not to overlap with the rotary sensor in a vertical direction parallel to the optical axis; wherein on the printed circuit board, the drive circuit is arranged in a drive circuit area , the driving circuit area is arranged between an image area in which the image sensor is arranged and a rotation area in which the rotation sensor is arranged; wherein the liquid lens comprises: a common electrode for electrically connecting to the conductive liquid; and a plurality of individual electrodes for electrically isolating from the common electrode, wherein the liquid lens is driven by the difference between the common voltage applied to the common electrode and the individual voltages applied to the individual electrodes; wherein the image area comprises: a central area , in which the image sensor is disposed; a first terminal region, in which a plurality of first terminals connected to a plurality of individual electrodes among the individual electrodes are disposed, the first terminal region being positioned on one side of the central region; a second terminal region, in which a plurality of second terminals connected to the remaining plurality of individual electrodes among the individual electrodes are disposed, the second terminal region being positioned on an opposite side of the central region; and a third terminal region, in which a third terminal connected to the common electrode is disposed. The photographic module as described in Item 1 of the patent application scope comprises: a connecting portion for electrically connecting the liquid lens to the conductive drive signal circuit. A photographic module comprises: a lens unit comprising a liquid lens, the liquid lens comprising a conductive liquid and a non-conductive liquid; a printed circuit board on which an image sensor is mounted, the image sensor being aligned with an optical axis of the lens unit; a driving circuit for controlling an interface formed between the conductive liquid and the non-conductive liquid of the liquid lens, the driving circuit being mounted on the printed circuit board; a rotary sensor mounted on the printed circuit board, the rotary sensor being used to sense the photographic The invention relates to a method for controlling the movement of the module; and a conductive drive signal circuit disposed on the printed circuit board, the conductive drive signal circuit being used to transmit a signal output by the drive circuit to control the interface of the liquid lens, wherein the conductive drive signal circuit is disposed so as not to overlap with the rotary sensor in a vertical direction parallel to the optical axis; wherein, on the printed circuit board, the rotary sensor is disposed in a rotary area, and the rotary area is disposed between a drive circuit area in which the drive circuit is disposed and a drive circuit area in which the image sensor is disposed. wherein, on the printed circuit board, the driving circuit is arranged in a driving circuit area, and the driving circuit area is arranged between an image area in which the image sensor is arranged and a rotation area in which the rotation sensor is arranged; wherein the liquid lens comprises: a common electrode for electrically connecting to the conductive liquid; and a plurality of individual electrodes for electrically isolating from the common electrode, wherein the liquid lens is electrically isolated by the difference between the common voltage applied to the common electrode and the individual voltages applied to the individual electrodes. The image area includes: a central area, in which the image sensor is arranged; a first terminal area, in which a plurality of first terminals connected to a plurality of individual electrodes among the individual electrodes are arranged, and the first terminal area is located on one side of the central area; a second terminal area, in which a plurality of second terminals connected to the remaining individual electrodes among the individual electrodes are arranged, and the second terminal area is located on an opposite side of the central area; and a third terminal area, in which a third terminal connected to the common electrode is arranged. The photographic module as described in item 3 of the patent application scope includes: a connecting portion for electrically connecting the liquid lens to the conductive drive signal circuit. The photographic module as described in item 1 or 3 of the patent application, wherein the driving circuit area is arranged between the image area and the rotation area in a horizontal direction intersecting the vertical direction, wherein the driving circuit area includes: a first side portion, in which a plurality of fourth terminals, a plurality of fifth terminals and a sixth terminal are arranged, the first side portion faces the image area; and a second side portion, formed opposite to the first side portion, the second side portion faces the rotation area, And wherein the conductive drive signal circuit includes: a first connecting wire for electrically connecting some of the individual voltages provided by the fourth terminals to the first terminals; a second connecting wire for electrically connecting the remaining individual voltages provided by the fifth terminals to the second terminals; and a third connecting wire for electrically connecting the common voltage provided by the sixth terminal to the third terminal. A photographic module as described in item 1 or 3 of the patent application, wherein the rotation area is arranged between the image area and the drive circuit area in a horizontal direction intersecting the vertical direction, and wherein the conductive drive signal line has a planar pattern so that the conductive drive signal line surrounds the rotation area. The photographic module as described in item 6 of the patent application, wherein the rotating area includes: a first side facing the image area; a second side facing the driving circuit area, the second side being arranged opposite to the first side; a third side disposed between the first side and the second side; and a fourth side disposed opposite to the third side, wherein the driving circuit area includes a first side in which a plurality of fourth terminals, a plurality of fifth terminals and a sixth terminal are arranged, and the first side The second side of the conductive drive signal circuit is facing the rotation area, and the conductive drive signal circuit includes: a first connecting wire for electrically connecting some of the individual voltages provided by the fourth terminals to the first terminals; a second connecting wire for electrically connecting the remaining individual voltages provided by the fifth terminals to the second terminals; and a third connecting wire for electrically connecting the common voltage provided by the sixth terminal to the third terminal. The photographic module as described in item 7 of the patent application, wherein the first connecting wire has a planar pattern so that the first connecting wire is separated from the third side of the turning area, and wherein the second connecting wire has a planar pattern so that the second connecting wire is separated from the fourth side of the turning area. As described in item 5 of the patent application scope, the third connecting wire has a planar pattern so that the third connecting wire is arranged adjacent to the first connecting wire or the second connecting wire. As described in item 7 of the patent application scope, the third connecting wire has a planar pattern so that the third connecting wire is arranged adjacent to the first connecting wire or the second connecting wire.

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