Camera module and operation method therefor

Abstract

To provide a camera module.SOLUTION: A camera module comprises: a lens assembly; a lens driving unit for moving the lens assembly in the direction of the optical axis; a position sensor unit for detecting the position of the lens assembly; and a control unit for, on the basis of the position of the lens assembly detected through the position sensor unit, outputting, to the lens driving unit, a drive signal for moving the lens assembly to a target position, where the position sensor unit comprises a plurality of sensor units which have at least one output terminal connected with each other, an amplifier which is commonly connected with the plurality of sensor units, and an analog-digital converter which is connected to the amplifier.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a camera module and a method of operation thereof. [Background technology]

[0002] Camera modules capture images of objects and store them as images or videos, and are installed in mobile terminals such as mobile phones, laptops, drones, vehicles, and the like.

[0003] Meanwhile, ultra-compact camera modules are built into portable devices such as smartphones, tablet PCs, and laptops, and these camera modules can perform an auto focus (AF) function that automatically adjusts the distance between the image sensor and the lens to align the focal length of the lens.

[0004] The autofocus function is an essential function for taking clear still or video images in a camera module. The autofocus function detects the position of a lens barrel equipped with a magnet using a position sensor, and when a driving signal is provided to a driving unit based on the detected lens barrel position and an input target position, a driving force is generated between a coil of the driving unit and a magnet equipped in the lens barrel, and the lens barrel moves to a focal position, thereby performing the autofocus function. However, the position sensor provided for providing the autofocus function provides a sensing signal including surrounding noise, etc., and therefore, the position of the lens barrel is not adjusted to a precise position.

[0005] In addition, in the case of a camera module installed in a portable device, electromagnetic components are in close contact with the camera module components, which causes high-frequency noise characteristics, so low-noise technology is essential. In addition, in the case of conventional position sensors, noise characteristics are improved by signal processing in the driving unit, but there is a limit to how much the noise characteristics can be improved by signal processing alone. DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a camera module and an operating method thereof that detects the position of a lens barrel based on differential signals from a plurality of position sensors, thereby increasing the range of position detection.

[0007] Another object of the present invention is to provide a camera module and an operating method thereof that can obtain a differential value at the front-end stage of the sensor.

[0008] The present invention is not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the proposed embodiments belong from the following description. [Means for solving the problem]

[0009] The camera module according to the present invention includes a lens assembly, a lens driving unit which moves the lens assembly in an optical axis direction, a position sensor unit which detects the position of the lens assembly, and a control unit which outputs a driving signal to the lens driving unit for moving the lens assembly to a target position based on the position of the lens assembly detected via the position sensor unit, and the position sensor unit includes a plurality of sensor units having at least one output terminal interconnected, an amplifier commonly connected to the plurality of sensor units, and an analog-to-digital converter connected to the amplifier.

[0010] The amplifier includes an inverting terminal and a non-inverting terminal, and the inverting terminal of the amplifier is connected to a first output terminal of a first sensor unit among the plurality of sensor units, and is connected to a second output terminal of a second sensor unit among the plurality of sensor units, the second sensor unit being different from the first sensor unit.

[0011] The first sensor unit is a sensor unit that is arranged first among the plurality of sensor units, and the second sensor unit is a sensor unit that is arranged last among the plurality of sensor units.

[0012] The first sensor unit is a first Hall sensor, the second sensor unit is a second Hall sensor, the first output terminal is a positive output terminal of the first Hall sensor, and the second output terminal is a negative output terminal of the second Hall sensor.

[0013] The negative output terminal of the first Hall sensor is connected to the positive output terminal of the second Hall sensor.

[0014] The first sensor unit is a first induction coil, the second sensor unit is a second coil, the first output terminal is one end of the first induction coil, the second output terminal is the other end of the second induction coil, and the other end of the first induction coil is connected to one end of the second induction coil.

[0015] Further, the multiple sensor units include a third Hall sensor disposed between the first and second Hall sensors, the positive output terminal of the third Hall sensor being connected to the negative output terminal of the first Hall sensor, and the negative output terminal of the third Hall sensor being connected to the positive output terminal of the second Hall sensor.

[0016] The inverter further includes a switch having one end connected to the inverting terminal of the amplifier and the other end selectively connected to either the negative output terminal of the first Hall sensor or the negative output terminal of the second Hall sensor.

[0017] The lens assembly includes a first lens assembly including a zoom lens group and a second lens assembly including a focus lens group, and the position sensor unit includes a first position sensor unit that detects a position of the first lens assembly and a second position sensor unit that detects a position of the second lens assembly.

[0018] In addition, an operating method of a camera module according to the present invention includes the steps of determining sensing conditions of a position sensor unit, controlling a switch according to the determined sensing conditions so that an inverting terminal of an amplifier is connected to one of an output terminal of a first positioned sensing unit and an output terminal of a last positioned sensing unit among a plurality of sensing units, detecting a position of a lens assembly corresponding to a detection signal input to the amplifier by controlling the switch, and moving the lens assembly to a target position according to the detected position, wherein the detecting step includes the steps of receiving an output signal of the first positioned sensing unit as the inverting terminal is connected to the output terminal of the first positioned sensing unit, and receiving a differential signal based on a combination of the plurality of sensing units as the inverting terminal is connected to the output terminal of the last positioned sensing unit.

[0019] Each of the plurality of sensing units includes a plurality of output terminals, at least one of the plurality of output terminals of each of the sensing units being connected to an output terminal of another adjacent sensing unit. Effect of the Invention

[0020] According to the present invention, a plurality of position sensors are interconnected, so that only the output terminals of the outermost position sensors are connected to an amplifier, whereby differential signals for the plurality of position sensors are input to the input terminals of the amplifier.

[0021] According to this, the present invention can provide a differential sensing method having a wider detection range than a single sensing method. Also, the present invention can minimize the effect of offset noise on the path to the signal processing unit of the driving unit by inputting a differential signal resulting from the combination of the plurality of position sensors to the input terminal of the amplifier.

[0022] In addition, in the present invention, differential signals for the multiple position sensors are output in a sensing unit consisting of multiple position sensors, an amplifier, and an analog-to-digital converter, so that the number of patterns and pins connected to a printed circuit board in a driving unit can be minimized, thereby saving space on the printed circuit board.

[0023] Furthermore, in the present invention, by determining the difference values ​​for the plurality of position sensors with respect to common mode noise, it is possible to have excellent characteristics not only against internal noise but also against external noise.

[0024] In addition, in the present invention, depending on the usage environment of the camera module, only the detection signal of a specific position sensor is transmitted to the amplifier stage, or differential signals for multiple position sensors are transmitted, so that the present invention can obtain optimal detection signals in environments where high detection sensitivity and wide detection range are required. [Brief description of the drawings]

[0025] [Figure 1] 1 is a perspective view of a camera module according to the present invention; [Diagram 2] 2 is a perspective view of the camera module in FIG. 1 with a cover removed. [Figure 3a] FIG. 3 is a perspective view of a mount in the camera module of FIG. 2. [Figure 3b] FIG. 3 is a perspective view of the camera module of FIG. 2 with the mount removed. [Figure 4a]3 is a perspective view of a first lens assembly in the camera module of FIG. 2. [Figure 4b] 3 is a perspective view of a second lens assembly in the camera module of FIG. 2. [Figure 4c] 3 is a perspective view of a second lens assembly in the camera module of FIG. 2. [Figure 5a] FIG. 3c is a conceptual diagram of a first magnetization method for the magnet in the camera module of FIG. 3b. [Figure 5b] FIG. 3b is a conceptual diagram of a second magnetization method for the magnet in the camera module of FIG. 3a. [Figure 6] FIG. 3 is a plan view of the camera module in FIG. 2. [Figure 7a] 7 is a cross-sectional view of the camera module taken along line A1-A1' in FIG. 6. [Figure 7b] 7 is a cross-sectional view of the camera module taken along line A2-A2' in FIG. 6. [Figure 7c] 7 is a cross-sectional view of the camera module taken along line A3-A3' in FIG. 6. [Figure 8] 1 is a block diagram showing an internal configuration of a camera module according to the present invention; [Figure 9] 9 is a block diagram showing a detailed configuration of a position sensor unit in FIG. 8. [Figure 10a] 10 is a diagram for explaining the connection relationship of the sensor unit in FIG. 9. [Figure 10b] 10 is a diagram for explaining the connection relationship of the sensor unit in FIG. 9. [Figure 10c] 10 is a diagram for explaining the connection relationship of the sensor unit in FIG. 9. [Figure 10d] 10 is a diagram for explaining the connection relationship of the sensor unit in FIG. 9. [Figure 11] FIG. 11 is a diagram comparing the connection relationship between a sensor unit according to a comparative example and a sensor unit of the present invention. [Figure 12] FIG. 11 is a diagram for explaining a connection relationship of a sensor unit according to another embodiment of the present invention. [Figure 13]FIG. 13 is a diagram showing a detection range of a position sensor unit according to a comparative example. [Figure 14] FIG. 4 is a diagram showing a detection range of a position sensor unit according to the embodiment of the present invention. [Figure 15] FIG. 13 is a block diagram showing a detailed configuration of a position sensor unit according to another embodiment of the present invention. [Figure 16] 4 is a flowchart illustrating steps of an operating method of a camera module according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The following detailed description will be given with reference to the accompanying drawings.

[0027] Meanwhile, in describing the embodiments, when it is stated that an element is formed "above / below" an element, "above / below" includes both cases where two elements are in direct contact with each other, and where one or more other elements are indirectly disposed between the two elements. In addition, when it is expressed as "above / below", it can include not only the upward direction but also the downward direction based on one element.

[0028] Additionally, as used hereinafter, relational terms such as "above / upper" and "lower / lower" are used to distinguish one component or element from another component or element, without requiring or implying any physical or logical relationship or order between such components or elements.

[0029] Furthermore, in the description of the embodiments, terms such as "first" and "second" are used to describe various components, but these terms are used for the purpose of distinguishing one component from another. Furthermore, terms that are specifically defined in consideration of the configuration and operation of the embodiments are merely for describing the embodiments, and do not limit the scope of the embodiments.

[0030] FIG. 1 is a perspective view of a camera module 100 according to the present invention, and FIG. 2 is a perspective view of the camera module 100 in FIG. 1 with a cover 10 removed.

[0031] 1, the camera module 100 according to the present invention has various optical systems coupled to a given mount 20 (see FIG. 2). For example, a prism 140 and a lens group are disposed on the mount 20, and a cover 10 is coupled to the mount 20 via a hook 20H.

[0032] The cover 10 is coupled to the mount 20. The cover 10 covers the components housed in the mount 20, thereby protecting the components of the camera module. The mount 20 is also called a base.

[0033] The lid 10 is coupled to the mount 20 by fitting. The lid 10 is also coupled to the mount 20 by an adhesive. For example, a hook 20H is protruded from the side of the mount 20, and the lid 10 has a hole at a position corresponding to the hook (H), and the hook of the mount 20 is fitted into the hole of the lid 10 to couple the lid 10 and the mount 20 together. The lid 10 is also stably coupled to the mount 20 by using an adhesive.

[0034] In addition, a circuit board 107 is disposed below the mount 20. The circuit board 107 is electrically connected to a lens driving unit disposed within the mount 20.

[0035] 2, in the camera module 100 according to the present invention, an optical system and a lens driving unit are disposed on a mount 20. For example, the camera module 100 includes at least one of a first lens assembly 110, a second lens assembly 120, a third lens group 130, a prism 140, a first driving unit 310, a second driving unit 320, a rod 50, and an image sensor unit 210.

[0036] The first lens assembly 110, the second lens assembly 120, the third lens group 130, the prism 140, the image sensor unit 210, etc. are classified as an optical system.

[0037] In addition, the first actuator 310, the second actuator 320, the rod 50, etc. are classified as a lens actuator, and the first lens assembly 110 and the second lens assembly 120 can also function as a lens actuator. The first actuator 310 and the second actuator 320 are coil actuators, but are not limited thereto.

[0038] The rod 50 serves as a guide for the lens assembly to be moved, and may be provided in one or more rods 50. For example, the rod 50 may include, but is not limited to, a first rod 51 and a second rod 52.

[0039] 2, the Z axis means the optical axis direction or a direction parallel thereto, the Y axis means a direction perpendicular to the Z axis on the paper surface (YZ plane), and the X axis means a direction perpendicular to the paper surface.

[0040] In the present invention, the prism 140 converts the incident light into a parallel light. For example, the prism 140 converts the light path of the incident light into a parallel optical axis (Z) parallel to the central axis of the lens group, thereby converting the incident light into a parallel light. The parallel light then passes through the third lens group 130, the first lens assembly 110, and the second lens assembly 120, and enters the image sensor unit 210, where an image is captured.

[0041] In the following description of the present invention, the moving lens group is described as having two moving lens groups, but the present invention is not limited to this, and the moving lens group may have three, four, five or more moving lens groups. In addition, the optical axis direction (Z) means a direction that is the same as or parallel to the alignment direction of the lens group.

[0042] The camera module according to the present invention can perform a zooming function. For example, the first lens assembly 110 and the second lens assembly 120 are moving lenses that move via the first driving unit 310, the second driving unit 320, and the rod 50, and the third lens group 130 is a fixed lens.

[0043] For example, the first lens assembly 110, the second lens assembly 120 include moving lens groups, and the third lens group 130 includes a fixed lens group.

[0044] The third lens group 130 functions as a focuser that focuses the parallel light onto a specific position.

[0045] In addition, the first lens assembly 110 functions as a variator that re-images an image formed by the third lens group 130, which is a condenser, at another location. Meanwhile, in the first lens assembly 110, the distance to the subject or the image distance changes significantly, causing a large change in magnification, and the first lens assembly 110, which is a variator, plays an important role in changing the focal length or magnification of the optical system.

[0046] On the other hand, the image points formed by the first lens assembly 110, which is a magnification variable element, may differ slightly depending on the position.

[0047] As a result, the second lens assembly 120 performs a position compensation function for the image formed by the magnification variable element. For example, the second lens assembly 120 performs a function of a compensator that functions to correctly image an image point formed by the first lens assembly 110, which is a magnification variable element, at the position of the image sensor unit 210.

[0048] For example, the first lens assembly 110 is a zoom lens assembly that performs a zooming function, and the second lens assembly 120 is a focus lens assembly that performs a focusing function.

[0049] The features of the camera module according to the embodiment will now be described in detail with reference to Figs. 3a to 5d.

[0050] First, Fig. 3a is a perspective view of the mount 20 in the camera module of Fig. 2. The mount 20 has a rectangular parallelepiped shape and includes four side surfaces and a bottom surface 20e. For example, the mount 20 includes first to fourth side surfaces 20a, 20b, 20c, and 20d, and the first side surface 20a and the second side surface 20b, and the third side surface 20c and the fourth side surface 20d face each other. The mount 20 has a hook 20H on at least one side thereof, which is connected to a hole in the cover 10.

[0051] Further, a first guide groove 112G in which the first lens assembly 110, the second lens assembly 120, and the third lens group 130 are positioned is provided in the optical axis (Z) direction on the bottom surface 20e of the mount 20. The first guide groove 112G has a shape that is recessed downward along the outer peripheral shape of the lens, but is not limited to this.

[0052] Further, a first opening 23a and a second opening 23b in which a first driving unit 310 and a second driving unit 320 are disposed are provided on a first side surface 20a and a second side surface 20b of the mount 20. Further, a third opening 22 in which an image sensor unit 210 is disposed is provided on a third side surface 20c of the mount 20.

[0053] Furthermore, the bottom surface of the mount 20 is provided with one or more fourth openings 27 through which the circuit board 107 is exposed.

[0054] Further, a single or multiple coupling holes 25 to which the rod 50 is coupled are provided on the third side surface 20c and the opposing fourth side surface 20d of the mount 20. For example, a first coupling hole 25a, a second coupling hole 25b, a third coupling hole 25c, and a fourth coupling hole 25d are provided on the third side surface 20c and the fourth side surface 20d of the mount 20, and a first rod 51, a second rod 52, a third rod 53, and a fourth rod 54 are coupled thereto, respectively.

[0055] Furthermore, on the inner side of the fourth side surface 20d of the mount 20, a prism mounting portion 24 for disposing a prism 140 thereon is provided.

[0056] The mount 20 is made of one or more of the following materials: plastic, glass-based epoxy, polycarbonate, metal, or composite material.

[0057] Next, FIG. 3b is a perspective view of the camera module of FIG. 2 with the mount 20 removed, showing the optical system and the lens drive section.

[0058] In the present invention, the lens driving device includes a mover and a fixed part. The mover is a concept corresponding to the fixed part and is also called a moving part. For example, the mover means a lens assembly that is moved by the rolling motion of a wheel. In contrast, the fixed part means a mount, a rod, etc. that does not move.

[0059] The camera module according to the present invention includes an optical system, such as a prism 140, a first lens assembly 110, a second lens assembly 120, a third lens group 130, and an image sensor unit 210, on a mount 20. The camera module also includes lens driving units, such as a first driving unit 310, a second driving unit 320, and a rod 50. The first lens assembly 110 and the second lens assembly 120 can also perform a lens driving function.

[0060] The rod 50 includes first to fourth rods 51, 52, 53, and 54, which are coupled to first to fourth coupling holes 25a, 25b, 25c, and 25d (see FIG. 3a), respectively, and function as movement guides for the first lens assembly 110 and the second lens assembly 120. The rod 50 is made of one or more of plastic, glass-based epoxy, polycarbonate, metal, or composite material.

[0061] The first driving unit 310 is a coil driving unit having a first coil 314 wound around a first core 312 such as an iron core. The second driving unit 320 is also a coil driving unit having a second coil 324 wound around a second core 322 such as an iron core.

[0062] First, the prism 140 changes the optical path of the incident light to an optical axis parallel to the central axis (Z) of the lens group, thereby converting the incident light into a parallel light. Then, the parallel light passes through the third lens group 130, the first lens assembly 110, and the second lens assembly 120, and is imaged by the image sensor unit 210.

[0063] The prism 140 is an optical member having a triangular prism shape. On the other hand, instead of the prism 140, a reflecting plate or a reflecting mirror can be used.

[0064] Furthermore, when the image sensor unit 210 is not disposed in a direction perpendicular to the optical axis, a prism (not shown) may be further provided since light passing through the lens group is imaged by the image sensor unit 210.

[0065] In the present invention, the image sensor unit 210 is disposed perpendicular to the optical axis direction of the parallel light. The image sensor unit 210 includes a solid-state imaging element 214 disposed on a second circuit board 212. For example, the image sensor unit 210 includes a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal-Oxide-Semiconductor) image sensor.

[0066] With reference to Figures 4a and 4b, the first lens assembly 110 and the second lens assembly 120 will now be described in more detail.

[0067] 4a is a perspective view of a first lens assembly 110 in the camera module of FIG. 2, and FIG. 4b is a perspective view of a second lens assembly 120 in the camera module of FIG.

[0068] As shown in FIG. 4a, the first lens assembly 110 includes one or more of a first housing 112, a first lens group 114, a first wheel 117, a third drive unit 116, and a first position sensor 118.

[0069] Also, as shown in FIG. 4b, the second lens assembly 120 includes one or more of a second housing 122, a second lens group 124, a second wheel 127, a fourth drive unit 126, and a second position sensor 128.

[0070] The following description will focus on the first lens assembly 110.

[0071] The first housing 112 of the first lens assembly 110 includes a first lens housing 112a and a first drive housing 112b. The first lens housing 112a functions as a lens barrel and has a first lens group 114 attached thereto. The first lens group 114 is a moving lens group and may include a single lens or multiple lenses. The second housing 122 of the second lens assembly 120 also includes a second lens housing 122a and a second drive housing 122b.

[0072] Here, a first guide groove 112G is provided on the lower side of one end of a first lens housing 112a of the first lens assembly 110. The first lens assembly 110 is guided by the first guide groove 112G and moves linearly in the optical axis direction while in sliding contact with a second rod 52. In addition, a second guide groove 122G is also provided on the lower side of one end of a second lens housing 122a of the second lens assembly 120.

[0073] In addition, the first housing 112 is configured to move in the optical axis direction due to sliding contact between the second rod 52 and the first guide groove 112G, thereby realizing a camera module that performs efficient autofocusing and zoom functions.

[0074] Furthermore, since the second housing 122 is configured to move in the optical axis direction due to the sliding contact between the first rod 51 and the second guide groove 122G, a camera module that performs efficient autofocusing and zoom functions can be realized.

[0075] Next, a third driving unit 116, a first wheel 117, and a first position sensor 118 are disposed in the first driving unit housing 112b of the first lens assembly 110. The first wheel 117 includes a plurality of wheels, including a 1-1 wheel 117a and a 1-2 wheel 117b.

[0076] Further, a fourth drive unit 126, a second wheel 127, and a second position sensor 128 are disposed in the second drive unit housing 122b of the second lens assembly 120. The second wheel 127 includes a plurality of wheels, including a 2-1 wheel 127a and a 2-2 wheel 127b.

[0077] The third actuator 116 of the first lens assembly 110 is a magnet actuator, but is not limited thereto. For example, the third actuator 116 may include a first magnet, which is a permanent magnet. Also, the fourth actuator 126 of the second lens assembly 120 is a magnet actuator, but is not limited thereto.

[0078] For example, FIG. 5a is a conceptual diagram of a first magnetization method of the first magnet in the third driving unit 116 of the first lens assembly 110, in which the N pole of the permanent magnet is arranged opposite the first driving unit 310, and the S pole is located on the opposite side of the first driving unit 310.

[0079] In this case, according to Fleming's left-hand rule, the direction of the electromagnetic force becomes horizontal to the optical axis direction, and the first lens assembly 110 is driven.

[0080] In particular, in the present invention, as shown in FIG. 4a, the first lens assembly 110 is provided with a first wheel 117, which is a rolling drive unit, and moves on the rod 50, thereby minimizing the generation of friction torque.

[0081] As a result, the lens assembly, lens driving device, and camera module including the same according to the present invention can improve driving force by minimizing friction torque between the lens assembly and the guide rod that moves during zooming. Therefore, according to the present invention, it is possible to reduce power consumption during zooming of the camera module and improve control characteristics.

[0082] Meanwhile, FIG. 5b is a conceptual diagram of a second magnetization method for the magnet that is the first driving unit 116B in the camera module according to the present invention.

[0083] In Fig. 5a, the first driving section 310 has a shape in which a first coil 314 is wound around a bar-shaped first core 312 (see Fig. 3b). In contrast, the 1-2 driving section 310B shown in Fig. 5b has a shape in which a coil is wound around a donut-shaped core.

[0084] As a result, in the first driving section 310 of FIG. 5a, the direction of current in the region facing the third driving section 116 is unidirectional.

[0085] On the other hand, the direction of the current in the area facing the third driving unit 116 in the 1-2 driving unit 310B in Figure 5b is not the same, and therefore, both the north pole and the south pole of the permanent magnet that is the 3-2 driving unit 116B are positioned opposite the 1-2 driving unit 310B.

[0086] 4a again, a first position sensor 118 is disposed in the first actuator housing 112b of the first lens assembly, thereby enabling position sensing and position control of the first lens assembly 110. For example, the first position sensor 118 disposed in the first actuator housing 112b is disposed opposite a first sensing magnet (not shown) disposed on the bottom surface of the mount 20.

[0087] Also, as shown in FIG. 4b, a second position sensor 128 is disposed in a second actuator housing 122b of the second lens assembly, so that the position of the second lens assembly 120 can be sensed and controlled.

[0088] Next, Fig. 6 is a plan view of the camera module in Fig. 2. Fig. 7a is a cross-sectional view taken along line A1-A1' of the camera module in Fig. 6, viewed from the Y-axis direction. Fig. 7b is a cross-sectional view taken along line A2-A2' of the camera module in Fig. 6, viewed from the Z-axis direction. Fig. 7c is a cross-sectional view taken along line A3-A3' of the camera module in Fig. 6, viewed from the Z-axis direction.

[0089] First, in FIG. 7a, the second actuator housing 122 and the fourth actuator 126 of the second lens assembly 120 are in an undisconnected state.

[0090] 7a, a first lens group 114 is attached to a first lens housing 112a of the first lens assembly 110. The first lens group 114 is attached to a first lens barrel 114b.

[0091] Further, a second lens group 124 is attached to the second lens housing 122a of the second lens assembly 120. The second lens group 124 is attached to a second lens barrel 124b.

[0092] The third lens group 130 also includes a third lens 134 mounted on a third lens barrel 1132 .

[0093] Each of the first to third lens groups 114, 124, and 134 may include one or more lenses.

[0094] In the camera module according to the present invention, the centers of prism 140, third lens group 130, first lens group 114, and second lens group 124 are arranged in the optical axis (Z) direction.

[0095] The third lens group 130 is disposed opposite to the prism 140, and the light emitted from the prism 140 is incident on the third lens group 130.

[0096] At least one of the first lens group 114, the second lens group 124, and the third lens group 134 is a fixed lens. For example, the third lens group 130 is fixedly disposed in the camera module and does not move in the optical axis direction, but is not limited to this.

[0097] For example, the mount 20 includes a mounting portion (not shown) to which the third lens group 130 is fixedly coupled. The third lens group 130 is seated in the mounting portion and fixed to the mounting portion by an adhesive.

[0098] The second lens group 124 is disposed apart from the third lens group 130 in the optical axis direction and moves in the optical axis direction. The third lens group 130 is disposed apart from the second lens group 124 in the optical axis direction and moves in the optical axis direction.

[0099] The light emitted from the third lens group 130 is incident on the image sensor unit 210 disposed behind the third lens group 130 .

[0100] By moving the first lens group 114 and the second lens group 124 in the optical axis direction, the distance between the first lens group 114 and the third lens group 130, and the distance between the first lens group 114 and the second lens group 124 are adjusted, thereby enabling the camera module to have a zooming function.

[0101] Next, Figure 7b is a cross-section along line A2-A2' of the camera module in Figure 6, viewed from the Z-axis direction, showing the state in which the 1-1 ring 117a and the 1-3 ring 117c are cut in the first lens assembly 110, and the state in which the 2-1 ring 127a and the 2-3 ring 127c are cut in the second lens assembly 120.

[0102] In the present invention, the first lens assembly 110 is equipped with the 1-1st wheel 117a and the 1-3rd wheel 117c which are rolling drive units, and the second lens assembly 120 is also equipped with the 2-1st wheel 127a and the 2-3rd wheel 127c which are rolling drive units, thereby having the effect of minimizing the generation of frictional torque by rolling on the first rod 51, the third rod 53, the second rod 52, and the fourth rod 54, respectively, by electromagnetic force.

[0103] As a result, the lens assembly, lens driving device, and camera module including the same according to the present invention can improve driving force by minimizing the generation of friction torque between the wheel, which is a rolling driving part of the lens assembly that moves in the optical axis (Z) direction, and the guide rod 50 during zooming. In addition, according to the present invention, the generation of friction resistance between the wheel and rod 50 of the lens assembly can be minimized, thereby reducing power consumption during zooming of the camera module and improving control characteristics.

[0104] Next, Figure 7c is a cross-section along line A3-A3' of the camera module in Figure 6, viewed from the Z-axis direction, and shows the state in which the 1-2 ring 117b and the 1-4 ring 117d are cut in the first lens assembly 110, and the state in which the 2-2 ring 127b, the 2-4 ring 127d, the second lens housing 122a, and the second lens group 124 are cut in the second lens assembly 120.

[0105] In the present invention, the first lens assembly 110 is equipped with the 1-2 wheel 117b and the 1-4 wheel 117d which are rolling drive units, and the second lens assembly 120 is also equipped with the 2-2 wheel 127b and the 2-4 wheel 127d which are rolling drive units, thereby rolling on the first rod 51, the third rod 53, the second rod 52, and the fourth rod 54, respectively, thereby obtaining the effect of minimizing the generation of friction torque.

[0106] As a result, according to the present invention, the generation of friction torque between the ring of the lens assembly and the rod 50 during zooming can be minimized, improving the driving force, thereby achieving the combined effects of reducing power consumption and improving control characteristics.

[0107] FIG. 8 is a block diagram showing the internal configuration of the camera module of the present invention.

[0108] As shown in FIG. 8, the camera module includes an image sensor 210, an image signal processing unit 220, a display unit 230, a first lens driving unit 240, a second lens driving unit 250, a first position sensor unit 260, a second position sensor unit 270, a storage unit 280, and a control unit 290.

[0109] As described above, the image sensor 210 processes an optical image of a subject formed by a lens. Therefore, the image sensor 210 can pre-process an image obtained through the lens. The image sensor 210 can also convert the pre-processed image into electrical data and output it.

[0110] The image sensor 210 is a type in which a number of photodetectors are integrated as individual pixels, and converts image information of a subject into electrical data and outputs the electrical data. The image sensor 210 accumulates the amount of light input, and outputs an image captured by the lens according to the accumulated amount of light in accordance with a vertical synchronization signal. Here, image acquisition is performed by the image sensor 210, which converts light reflected from a subject into an electrical signal. Meanwhile, in order to obtain a color image using the image sensor 210, a color filter is required, and for example, a CFA (Color Filter Array) filter is used. The CFA has a structure in which only colors that represent one color pass per pixel, and has a regularly arranged structure, and has various forms depending on the arrangement structure.

[0111] The image signal processing unit 220 processes, in units of frames, an image output via the image sensor 210. Here, the image signal processing unit 220 is also called an ISP (Image Signal Processor).

[0112] Here, the image signal processor 220 includes a lens shading compensation unit (not shown) which is a block for compensating for a lens shading phenomenon that occurs when the amount of light differs between the center and edge regions of an image, and receives a lens shading setting value from the controller 270 (described later) to compensate for the colors of the center and edge regions of an image.

[0113] Furthermore, the lens shading compensation unit may receive shading parameters differently set according to the type of illumination, and process the lens shading of the image according to the received parameters. Thus, the lens shading compensation unit may perform lens shading processing by applying different shading levels according to the type of illumination. Meanwhile, the lens shading compensation unit may receive shading parameters differently set according to an auto exposure weight applied to a specific region of the image in order to prevent a saturation phenomenon occurring in the image, and process the lens shading of the image according to the received parameters. More specifically, the lens shading compensation unit compensates for brightness changes occurring in edge regions of the image signal by applying an auto exposure weight to a central region of the image signal. That is, when saturation of the image signal occurs due to illumination, the light intensity decreases from the center to the periphery in a concentric shape, so the lens shading compensation unit amplifies edge signals of the image signal to compensate for brightness compared to the center.

[0114] Meanwhile, the image signal processor 220 may measure the sharpness of an image acquired through the image sensor 210. That is, the image signal processor 220 measures the sharpness of an image in order to check the focus accuracy of the image acquired through the image sensor 210. The sharpness may be measured for each image acquired according to the position of the focus lens.

[0115] The display unit 230 displays the captured image under the control of the control unit 290, which will be described later, and displays a setting screen required for taking a photograph and a screen for the user to select an operation.

[0116] The first lens driving unit 240 moves a first lens assembly. Preferably, the first lens driving unit 240 moves a first lens group included in the first lens assembly. Preferably, the first lens group is a zoom lens. The first lens driving unit 240 moves the zoom lens in the optical axis direction to adjust the zoom position (or zoom magnification) of the zoom lens.

[0117] The second lens driving unit 250 moves the second lens assembly. Preferably, the second lens driving unit 250 moves a second lens group included in the second lens assembly as described above. Here, the second lens group includes a focus lens. The second lens driving unit 250 moves the focus lens in the optical axis direction to adjust the focus position of the focus lens.

[0118] The first position sensor unit 260 includes the above-mentioned first position sensor 118, thereby detecting the position of the first lens assembly 110. Preferably, the first position sensor unit 260 can sense the position of a third drive unit 116 disposed in the first lens assembly 110. Preferably, the first position sensor unit 260 senses the position of the first lens assembly 110 in order to control the position of the first lens assembly 110.

[0119] In other words, the first position sensor unit 260 provides position data for moving the first lens assembly via the first lens actuator unit 240 .

[0120] The second position sensor unit 270 includes the above-mentioned second position sensor 128, thereby detecting the position of the second lens assembly 120. Preferably, the second position sensor unit 270 can sense the position of a fourth drive unit 126 disposed in the second lens assembly 120. Preferably, the second position sensor unit 270 senses the position of the second lens assembly 120 in order to control the position of the second lens assembly 120.

[0121] In other words, the second position sensor unit 270 provides position data for moving the second lens assembly via the second lens driver unit 250 .

[0122] The storage unit 280 stores data necessary for the operation of the camera module 100. In particular, the storage unit 280 stores information regarding the zoom position and the focus position according to the distance to the subject. That is, the focus position is the position of the focus lens for correctly focusing on the subject. The focus position varies depending on the zoom position of the zoom lens and the distance to the subject. Therefore, the storage unit 280 stores data regarding the zoom position and the focus position corresponding to the zoom position according to the distance.

[0123] The control unit 290 controls the overall operation of the camera module, particularly the first position sensor unit 260 and the second position sensor unit 270 to provide an autofocus function.

[0124] In other words, the control unit 290 controls the position of the first lens assembly to be detected via the first position sensor unit 260. Preferably, the control unit 290 controls the current position of the first lens assembly to be detected via the first position sensor unit 260 in order to move the first lens assembly to a target position.

[0125] Then, when the current position of the first lens assembly is detected via the first position sensor unit 260, the control unit 290 supplies a control signal to the first lens driving unit 240 to move the first lens assembly to a target position based on the current position of the first lens assembly.

[0126] Also, the control unit 290 controls the position of the second lens assembly to be detected via the second position sensor unit 270. Preferably, the control unit 290 controls the current position of the second lens assembly to be detected via the second position sensor unit 270 in order to move the second lens assembly to a target position.

[0127] Then, when the current position of the second lens assembly is detected via the second position sensor unit 270, the control unit 290 supplies a control signal to the second lens driving unit 240 to move the second lens assembly to a target position based on the current position of the second lens assembly.

[0128] Here, the control section 290 receives, via the first position sensor section 260 and the second position sensor section 270, a differential signal of detection signals detected by a plurality of sensor units constituting each sensor section.

[0129] In other words, in the present invention, each of the first position sensor unit 260 and the second position sensor unit 270 includes a plurality of sensor units. The plurality of sensor units perform detection operations at their respective installation positions. In the present invention, the positions of the first lens assembly and the second lens assembly are detected by using differential signals of detection signals acquired via the plurality of sensor units.

[0130] Generally, signals detected by the plurality of sensor units are input to the control unit 290, and the positions of the first lens assembly and the second lens assembly can be detected based on the corresponding differential signals.

[0131] However, in the case of the above structure, an amplifier and an analog-to-digital converter must be disposed in each of the sensor units, and the control unit 290 must be provided with a number of connection terminals connected to the analog-to-digital converters connected to each of the sensor units. In addition, there is a problem that offset noise occurs on the path from each of the sensor units to the control unit 290.

[0132] Therefore, in the present invention, digital data for the differential signals is acquired in the front-end stage, and the acquired digital data is input to the control unit 290 .

[0133] In other words, in the present invention, the digital data is acquired in the first position sensor unit 260 and the second position sensor unit 270, and thus only the acquired digital data is input to the control unit 290.

[0134] The first position sensor unit 260 and the second position sensor unit 270 will be described in detail below.

[0135] FIG. 9 is a block diagram showing a detailed configuration of the position sensor unit in FIG.

[0136] 9 shows one of the first position sensor unit 260 and the second position sensor unit 270. Here, the first position sensor unit 260 and the second position sensor unit 270 may include the same configuration as each other, and may be connected to the control unit 290, respectively.

[0137] As shown in FIG. 9, each of the first position sensor section 260 and the second position sensor section 270 includes a plurality of sensor units 310, an amplifier 320, and an analog-to-digital converter 330.

[0138] The plurality of sensor units 310 includes a sensor for detecting a position. Preferably, the plurality of sensor units 310 includes a plurality of hall sensors. Alternatively, the plurality of sensor units 310 includes a plurality of induction coils.

[0139] Here, the two outermost sensors of the plurality of sensor units 310 are connected to the amplifier 320, and the remaining sensor units are connected to adjacent sensor units, respectively. The connection structure of the plurality of sensor units 310 will be described later.

[0140] That is, as described above, in the present invention, the plurality of sensor units 310 are interconnected, and the output terminal of the outermost sensor unit is connected to the amplifier 320. As a result, a sum signal of the detection signals detected by the respective sensor units is input to the amplifier 320. This is expressed as the sum of the sensing ranges of the respective sensor units, and therefore, the sensing range of the plurality of sensor units 310 input to the amplifier 320 is expanded compared to that of a single sensor unit.

[0141] The amplifier 320 includes a non-inverting terminal (+) and an inverting terminal (-). The amplifier 320 differentially amplifies a signal inputted to the non-inverting terminal (+) and a signal inputted to the inverting terminal (-), and outputs the amplified signal to the analog-to-digital converter 330. That is, the output signal for the plurality of sensor units 310 has a size of several mV, which is a size that does not match the input range of the analog-to-digital converter 330. Therefore, the amplifier 320 differentially amplifies the signal inputted through the non-inverting terminal (+) and the inverting terminal (-) to match the input range of the analog-to-digital converter 330, and outputs the amplified signal.

[0142] The analog-to-digital converter 330 receives an analog signal from the amplifier 320, converts the received analog signal into a digital signal, and outputs the digital signal.

[0143] Preferably, the analog-to-digital converter 330 receives an analog signal from the amplifier 320 and outputs a multi-bit digital signal, where the output signal of the analog-to-digital converter 330 is expressed as a value of 0 or 1.

[0144] Here, the plurality of sensor units 310 in the first aspect of the present invention are composed of a plurality of Hall sensors 310A.

[0145] In the following, when the plurality of sensor units 310 are Hall sensors, the mutual connection relationship of each Hall sensor will be described.

[0146] 10a to 10d are diagrams for explaining the connection relationship of the sensor unit in FIG.

[0147] 10a, the Hall sensor constituting the plurality of sensor units 310 includes four terminals, two of which are input terminals and the remaining two terminals are output terminals.

[0148] The two input terminals are power supply input terminals, and the two output terminals are output terminals for detecting signals.

[0149] Preferably, the Hall sensor includes a first power supply terminal 311, a second power supply terminal 312, a first detection signal output terminal 313, and a second detection signal output terminal 314. The first power supply terminal 311 is a terminal to which a positive (+) polarity power supply is input, and the second power supply terminal 312 is a terminal to which a negative (-) polarity power supply is input. The first detection signal output terminal 313 is a terminal from which a positive polarity detection signal is output, and the second detection signal output terminal 314 is a terminal from which a negative polarity detection signal is output.

[0150] Here, the connection relationship between the two output terminals of the plurality of Hall sensors constituting the plurality of sensor units 310 appears differently depending on the positions where the sensors are arranged on the camera module.

[0151] That is, the first power supply terminal 311 of each of the plurality of Hall sensors is connected to a power supply of positive polarity, and the second power supply terminal 312 is connected to a power supply of negative polarity (or ground).

[0152] The detection signal output terminals of the plurality of Hall sensors may have different connection relationships depending on the arrangement positions of the Hall sensors. Here, the plurality of Hall sensors includes at least two Hall sensors. In other words, the plurality of sensor units includes at least two sensor units.

[0153] Here, a case where the plurality of sensor units are composed of three Hall sensors will be described. When the plurality of sensor units are composed of three Hall sensors, two of the Hall sensors are arranged on the outer periphery, and the remaining one Hall sensor is arranged between the two Hall sensors arranged on the outer periphery. In addition, in one Hall sensor between the two Hall sensors arranged on the outer periphery, the first detection signal output terminal 313 and the second detection signal output terminal 314 are respectively connected to the output terminals of the two Hall sensors arranged on the outer periphery. In addition, in each of the two output terminals of the two Hall sensors arranged on the outer periphery, one output terminal is connected to the amplifier 320, and the other output terminal is connected to the adjacent Hall sensor.

[0154] That is, Fig. 10b shows the connection relationship of the output terminals of the first Hall sensor among the multiple Hall sensors. As shown in Fig. 10b, the first Hall sensor includes the first detection signal output terminal 313 and the second detection signal output terminal 314, where the first detection signal output terminal 313 is connected to the non-inverting terminal (+) of the amplifier 320, and the second detection signal output terminal 314 is connected to the first detection signal output terminal of the adjacent Hall sensor. In other words, the second detection signal output terminal 314 of the first Hall sensor is connected to the first detection signal output terminal of the second Hall sensor.

[0155] Fig. 10c shows the connection relationship of the output terminals of the Hall sensors arranged between the Hall sensors arranged on the outer periphery, i.e. Fig. 10c shows the connection relationship of the output terminals of the remaining Hall sensors excluding the first Hall sensor and the last Hall sensor among the multiple Hall sensors.

[0156] 10c, among the plurality of Hall sensors, the remaining second Hall sensors except the first Hall sensor and the last Hall sensor include the first detection signal output terminal 313 and the second detection signal output terminal 314. And the first detection signal output terminal 313 of the second Hall sensor is connected to the second detection signal output terminal of the previously arranged Hall sensor, and the second detection signal output terminal 314 is connected to the first detection signal output terminal of the next arranged Hall sensor. In other words, the first detection signal output terminal of the second arranged Hall sensor is connected to the second detection signal output terminal of the first arranged Hall sensor, and the second detection signal output terminal of the second arranged Hall sensor is connected to the first detection signal output terminal of the third arranged Hall sensor.

[0157] 10d shows the connection relationship of the output terminals of the last Hall sensor. The last third Hall sensor includes the first detection signal output terminal 313 and the second detection signal output terminal 314. The first detection signal output terminal 313 of the third Hall sensor is connected to the second detection signal output terminal of the previous Hall sensor, and the second detection signal output terminal 314 is connected to the inverting terminal (-) of the amplifier 320.

[0158] As described above, in the present invention, only one of the two output terminals of each of the two Hall sensors arranged on the outer periphery is connected to the amplifier 320, and the remaining terminals are connected to the output terminals of the adjacent Hall sensors. In the case of such a connection structure, a signal corresponding to the sum of the sensing ranges of the plurality of Hall sensors is input to the amplifier 320, which then differentially amplifies and outputs the signal.

[0159] In an embodiment of the present invention, a plurality of position sensors such as Hall sensors are interconnected, so that only the output terminals of the outermost position sensor are connected to an amplifier, thereby allowing differential signals for the plurality of position sensors to be input to the input terminals of the amplifier.

[0160] According to this, the present invention can provide a differential sensing method having a wider detection range than a single sensing method. Also, the present invention can minimize exposure to offset noise in a path of an output signal of the position sensor to the controller by inputting a differential signal resulting from coupling of the plurality of position sensors to an input terminal of the amplifier.

[0161] In addition, in the present invention, differential signals for the multiple position sensors are output within a sensing unit consisting of multiple position sensors, an amplifier, and an analog-to-digital converter, so that the number of patterns and pins connected to a printed circuit board in a driving unit can be minimized, thereby saving space on the printed circuit board.

[0162] Furthermore, in the present invention, by determining the difference values ​​for the plurality of position sensors with respect to common mode noise, it is possible to provide excellent characteristics not only against internal noise but also against external noise.

[0163] In addition, in the present invention, depending on the usage environment of the camera module, only the detection signal of a specific position sensor is transmitted to the amplifier stage, or differential signals for a plurality of position sensors are transmitted, thereby making it possible to obtain optimal detection signals in environments where high detection sensitivity and wide detection range are required.

[0164] FIG. 11 is a diagram comparing the connection relationship between a sensor unit according to a comparative example and a sensor unit according to the present invention.

[0165] That is, in order to increase the sensing range of the position sensor, multiple position sensors can be arranged, and the control unit 290 can calculate and use differential signals for the multiple position sensors.

[0166] In other words, as shown in FIG. 11(a), in the comparative example, the output terminals of the multiple Hall sensors are connected to different amplifiers. Also, the amplifiers connected to the Hall sensors are connected to different analog-to-digital converters. As a result, the control unit must be provided with input pins connected to multiple analog-to-digital converters. Here, each of the analog-to-digital converters outputs a multi-bit digital signal via multiple signal lines, and as the number of the analog-to-digital converters increases, the number of input pins required by the control unit increases proportionately. Also, in the comparative example, the amplifiers and analog-to-digital converters must be provided in the same number as the number of the Hall sensors.

[0167] However, in the present invention, one of two output terminals of the Hall sensor arranged on the outer periphery among the plurality of Hall sensors is connected to the non-inverting terminal (+) and inverting terminal (-) of the amplifier 320, and the output terminal including the remaining Hall sensor is connected to the output terminal of the adjacent Hall sensor. As a result, in the present invention, the number of input pins required in the control unit 290 can be minimized, and the problem of the detection signal being exposed to offset noise on the path to the control unit 290 can be minimized.

[0168] FIG. 12 is a diagram for explaining the connection relationship of a sensor unit according to another embodiment of the present invention.

[0169] Although it has been described above that the plurality of sensor units are each formed of a Hall sensor, in the present invention, the plurality of sensor units may be formed of an induction coil instead of the Hall sensor.

[0170] As shown in Fig. 12, the sensor units include a plurality of induction coils, each of which includes two output terminals, where one of the two output terminals is one end of the induction coil and the other of the two output terminals is the other end of the induction coil.

[0171] The ends of the multiple induction coils are connected to the ends of adjacent induction coils or to the non-inverting terminal (+) or inverting terminal (-) of the amplifier 320 in a manner corresponding to the connection relationship of the Hall sensor.

[0172] That is, the first output terminal of the first induction coil is connected to the non-inverting terminal (+) of the amplifier 320. And the second output terminal of the first induction coil is connected to the first output terminal of the next adjacent induction coil.

[0173] Then, the first output terminal of the secondly placed induction coil is connected to the second output terminal of the previously placed induction coil, and the second output terminal of the secondly placed induction coil is connected to the first output terminal of the next induction coil.

[0174] In addition, the first output terminal of the last placed induction coil is connected to the second output terminal of the previously placed induction coil, and the second output terminal of the last placed induction coil is connected to the inverting terminal (-) of the amplifier 320.

[0175] FIG. 13 is a diagram showing the detection range of a position sensor unit according to a comparative example, and FIG. 14 is a diagram showing the detection range of a position sensor unit according to the present invention.

[0176] As shown in Fig. 13, when the sensor unit constituting the position sensor unit is a single sensor unit, the sensing range of the position sensor unit is quite narrow. That is, the conventional sensing method uses only the output of one sensor, and here, only the linear section (X section) of the output of the one sensor is used.

[0177] In contrast, referring to Fig. 14, in the present invention, the position sensor unit is composed of multiple sensor units, and the sensing range is determined based on the differential signals for the multiple sensor units. Therefore, in the present invention, it is possible to provide a position sensor unit having a wider sensing range than the comparative example shown in Fig. 13.

[0178] FIG. 15 is a block diagram showing a detailed configuration of a position sensor unit according to another embodiment of the present invention.

[0179] Meanwhile, the position sensor unit has a structure in which a plurality of sensor units are interconnected to provide signals to the amplifier 320. In the case of such a connection structure, the sensing range for the detection signals of the plurality of sensor units can be greatly increased, but the sensing sensitivity can be decreased compared to a single sensor type.

[0180] Therefore, in the present invention, depending on the operating conditions of the camera module, detection signals from multiple sensor units connected to the amplifier 320 are supplied, or only detection signals from a specific sensor unit among the multiple sensor units are transmitted to the amplifier 320.

[0181] For this reason, as in FIG. 15, the position sensor portion further includes a switch 340 .

[0182] The switch 340 has one end connected to the inverting terminal (-) of the amplifier 320, and the other end connected to any one of the output terminals of the plurality of sensor units.

[0183] In other words, when the multiple sensor units consist of two Hall sensors, the switch 340 is connected to the second detection signal output terminal of the first arranged Hall sensor or the second detection signal output terminal of the second arranged Hall sensor.

[0184] Here, when the switch 340 is connected to the second detection signal output terminal of the first Hall sensor, only the output signal of the first Hall sensor is input to the amplifier 320. As a result, in the present invention, the amplifier 320 is connected only to the specific Hall sensor, thereby providing optimal sensing sensitivity under conditions where sensing sensitivity is required.

[0185] Also, when the switch 340 is connected to the second detection signal output terminal of the second Hall sensor, a combined signal of the output signals of the first Hall sensor and the second Hall sensor is input to the amplifier 320. Thus, in the present invention, the amplifier 320 is connected to the plurality of Hall sensors, so that an optimal sensing range can be provided under conditions where a sensing range is required.

[0186] In an embodiment of the present invention, a plurality of position sensors such as Hall sensors are interconnected, so that only the output terminals of the outermost position sensor are connected to an amplifier, thereby allowing differential signals for the plurality of position sensors to be input to the input terminals of the amplifier.

[0187] According to this, the present invention can provide a differential sensing method having a wider detection range than a single sensing method. Also, the present invention can minimize exposure to offset noise in a path of an output signal of the position sensor to the controller by inputting a differential signal resulting from coupling of the plurality of position sensors to an input terminal of the amplifier.

[0188] In addition, in the present invention, differential signals for the multiple position sensors are output in a sensing unit consisting of multiple position sensors, an amplifier, and an analog-to-digital converter, so that the number of patterns and pins connected to a printed circuit board in the driving unit can be minimized, thereby saving space on the printed circuit board.

[0189] Furthermore, in the present invention, by determining the difference values ​​for the plurality of position sensors with respect to common mode noise, it is possible to have excellent characteristics not only against internal noise but also against external noise.

[0190] In addition, in the present invention, depending on the usage environment of the camera module, only the detection signal of a specific position sensor is transmitted to the amplifier stage, or differential signals for a plurality of position sensors are transmitted, so that the present invention can obtain optimal detection signals in environments where high detection sensitivity and wide detection range are required.

[0191] FIG. 16 is a flow chart for explaining the steps of an operation method of the camera module according to the present invention.

[0192] First, the control unit 290 determines position sensing conditions for the first and second lens assemblies of the camera module (S110). Here, the determination of the position sensing conditions determines whether the current operating conditions are conditions that require sensing sensitivity or sensing range in acquiring position data. For example, since the movement range of the lens assembly is large, the wide detection range is required for correct position sensing. On the other hand, if the movement range of the lens assembly is small and there is a minute movement, the correct detection sensitivity is required rather than the wide detection range. Thus, the control unit can determine the position sensing conditions. Then, the control unit 290 controls the switching operation of the switch 340 according to the determined position sensing condition (S120).

[0193] Next, the control unit 290 receives a differential signal of the plurality of interconnected sensor units or a detection signal of a specific sensor unit through the operation of the switch 340 (S130).

[0194] Then, the control unit 290 calculates the current position of the first or second lens assembly based on the received signal (S140).

[0195] Furthermore, when the current position is calculated, the control unit 290 outputs a control signal to the first lens driving unit 240 or the second lens driving unit 250 according to the difference between the calculated current position and the target position (S150).

[0196] The features, structures, effects, etc. described above are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person having ordinary skill in the art to which the present invention belongs. Therefore, the contents related to such combinations and modifications should be analyzed as being included in the scope of the present invention.

[0197] Although the above description has focused on the embodiments, these are merely illustrative and do not limit the present invention, and a person having ordinary skill in the art to which the present invention pertains will understand that multiple modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present invention. For example, each component specifically shown in the present invention can be modified and implemented. Differences regarding such modifications and applications should be interpreted as being included in the scope of the present invention as defined in the appended claims.

Claims

1. A moving part; A drive unit that drives the moving unit; A plurality of sensor units for detecting a position of the moving part; an input unit connected to the plurality of sensor units; Including, the plurality of sensor units includes a first sensor unit and a second sensor unit, the input unit is connected to the first sensor unit and the second sensor unit, the first sensor unit includes a first detection signal output terminal and a second detection signal output terminal; the second sensor unit includes a third detection signal output terminal and a fourth detection signal output terminal; The second detection signal output terminal is directly connected to the third detection signal output terminal.

2. The camera module of claim 1 , wherein the second detection signal output terminal and the third detection signal output terminal are connected in series.

3. The camera module of claim 1 , wherein the first detection signal output terminal and the fourth detection signal output terminal are directly connected to the input portion.

4. The camera module of claim 3 , wherein the input unit includes a first input terminal directly connected to the first detection signal output terminal and a second input terminal directly connected to the fourth detection signal output terminal.

5. the first input terminal is one of a non-inverting terminal and an inverting terminal; The camera module according to claim 4 , wherein the second input terminal is one of a non-inverting terminal and an inverting terminal, which is different from the first input terminal.

6. the plurality of sensor units further includes a third sensor unit; the third sensor unit includes a fifth detection signal output terminal and a sixth detection signal output terminal; The camera module of claim 1 , wherein the fifth detection signal output terminal is directly connected to one of the first detection signal output terminal and the fourth detection signal output terminal.

7. the second sensor unit is disposed between the first sensor unit and the third sensor unit; The camera module of claim 6 , wherein the fifth detection signal output terminal is connected in series with the fourth detection signal output terminal.

8. the input unit includes a first input terminal and a second input terminal; the first input terminal is directly connected to the first detection signal output terminal; The camera module of claim 7 , wherein the second input terminal is directly connected to the sixth detection signal output terminal.

9. The camera module according to claim 1 , wherein the input section receives a differential signal of a first detection signal of the first sensor unit and a second detection signal of the second sensor unit.

10. A drive control unit that controls the drive unit, The driving unit includes a coil. The camera module according to claim 9 , wherein the drive control unit controls a current applied to the coil based on the differential signal received by the input unit.

11. The camera module according to claim 1 , wherein the input section includes an amplifier section coupled to the first and second sensor units, and an analog-to-digital converter section coupled to the amplifier section.

12. The camera module of claim 1 , wherein each of the first and second sensor units includes a Hall sensor.

13. The camera module according to claim 1 , wherein each of the first and second sensor units detects a magnetic force that changes depending on a moving position of the moving part.

14. A moving part; A drive unit that drives the moving unit; A plurality of sensor units for detecting a position of the moving part; an input unit coupled to the plurality of sensor units; Including, the plurality of sensor units includes a first sensor unit and a second sensor unit, the input unit includes a first input terminal and a second input terminal, the first sensor unit includes a first detection signal output terminal and a second detection signal output terminal; the second sensor unit includes a third detection signal output terminal and a fourth detection signal output terminal; the second detection signal output terminal is directly connected to the third detection signal output terminal; the first detection signal output terminal is connected to the first input terminal of the input unit, The fourth detection signal output terminal is connected to the second input terminal of the input unit.

15. The camera module of claim 14 , wherein the second detection signal output terminal and the third detection signal output terminal are connected in series.

16. the first input terminal is one of a non-inverting terminal and an inverting terminal; The camera module according to claim 14 , wherein the second input terminal is one of a non-inverting terminal and an inverting terminal, which is different from the first input terminal.

17. A moving part; A drive unit that drives the moving unit; A plurality of sensor units for detecting a position of the moving part; an input unit coupled to the plurality of sensor units; Including, the plurality of sensor units includes a first sensor unit and a second sensor unit, the input unit is connected to the first sensor unit and the second sensor unit, the first and second sensor units are electrically connected in series; The input unit includes a first input terminal connected to the first sensor unit and a second input terminal connected to the second sensor unit.

18. The driving unit includes a coil. The camera module according to claim 17 , wherein the input section controls a current applied to the coil based on detection signals of the first and second sensor units.

19. the plurality of sensor units further includes a third sensor unit disposed between the first sensor unit and the second sensor unit; the third sensor unit is directly connected to each of the first sensor unit and the second sensor unit; The camera module of claim 17 , wherein the second sensor unit is electrically connected in series with the first sensor unit via the third sensor unit.

20. A moving part; A drive unit that drives the moving unit; A plurality of sensor units for detecting a position of the moving part; an amplifier coupled to the plurality of sensor units; Including, the plurality of sensor units includes a first sensor unit and a second sensor unit, the amplifier is connected to the first sensor unit and the second sensor unit; the first sensor unit includes a first detection signal output terminal and a second detection signal output terminal; the second sensor unit includes a third detection signal output terminal and a fourth detection signal output terminal; The second detection signal output terminal is directly connected to the third detection signal output terminal.

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