KR20200060201A - Camera module - Google Patents

Abstract

Disclosed is a camera module installed on a small digital device, capable of performing rapid and accurate capturing. The disclosed camera module includes: a case; a base disposed on one end of the case, and on which an image sensor is mounted; a fixed lens barrel disposed at an opposite end of the case, and having a first lens; a plurality of guide pins arranged in parallel with each other, and having both ends connected to the base and the fixed lens barrel, respectively; first and second movable lens barrels movably disposed between the base and the fixed lens barrel along a plurality of guide pins, and having second and third lenses, respectively; first and second driving units for driving the first and second movable lens barrels, respectively; and first and second position sensing units for sensing positions of the first and second movable lens barrels, respectively, wherein the first position detection unit includes a first hall sensor fixed to the case and a first magnet coupled to the first movable lens barrel such that a distance between the first magnet and the first hall sensor varies according to a movement of the first movable lens barrel, and the second position sensing unit includes a second hall sensor fixed to the case and a second magnet coupled to the second movable lens barrel such that a distance between the second magnet and the second hall sensor varies according to a movement of the second movable lens barrel.

Description

Camera module {CAMERA MODULE}

The present invention relates to a camera module, and more particularly, to a camera module that is installed in a small digital device such as a smartphone and has an optical zoom and auto focus adjustment function.

2. Description of the Related Art Recently, with the development of miniaturization and weight reduction technology for digital cameras, mobile communication terminals equipped with optical lenses and camera elements have become common.

Here, the camera module mounted on the mobile communication terminal is manufactured in a compact form so that the size of the portable device is not increased, and various functions such as an optical zoom function, an automatic focus adjustment function, an image stabilization function, and a light amount adjustment function are applied.

As described above, the camera module is provided with a lens barrel in which a plurality of lenses are accommodated, a carrier in which a lens barrel is inserted and movable in the optical axis direction, a base coupled to a carrier to support the carrier, and a carrier installed on the base to base the carrier It consists of an actuator or the like to move from one side to the other side.

However, as the above-described conventional camera module needs to perform optical zoom and auto focus adjustment functions using a single lens barrel, the travel time of the carrier is long, and as a result, implementation of each function takes a long time. There is a problem in that the probability of occurrence of a malfunction or a functional error increases due to frequent movement. In addition, when any one of the plurality of lenses needs to be replaced, there is a problem in that the lens barrel must be replaced integrally.

In addition, the conventional camera module has a problem in that due to manufacturing tolerances between the carrier and the base supporting the carrier, a flow occurs in the carrier, and thus, the direction of the lens is distorted or automatic focus adjustment cannot be performed.

An object of the present invention is to provide an optical zoom and auto focus control function individually through a plurality of independently driveable carriers, thereby providing a camera module capable of quick and accurate shooting.

In addition, another object of the present invention is to accurately detect and control the movable lens barrel moving a short distance by inclining the magnet disposed on the movable lens barrel sensed by the Hall sensor, thereby minimizing the length of the camera module. It is to provide a camera module that can be limited to manufacture compact.

In order to achieve the above object, the present invention, the case; A base disposed on one end of the case and mounted with an image sensor; A fixed lens barrel disposed at the other end of the case and having a first lens; A plurality of guide pins, both ends of which are connected to the base and the fixed lens barrel and arranged in parallel; First and second movable lens barrels disposed movably along the plurality of guide pins between the base and the fixed lens barrel, each having second and third lenses; First and second driving units for driving the first and second movable lens barrels, respectively; And first and second position sensing units for sensing the positions of the first and second movable lens barrels, respectively. The first position sensing unit includes a first Hall sensor fixed to the case. And, including a first magnet coupled to the first movable lens barrel so that the distance from the first Hall sensor is variable according to the movement of the first movable lens barrel, the second position detecting unit, the case It characterized in that it comprises a fixed second Hall sensor (Hall sensor), and a second magnet coupled to the second movable lens barrel so that the distance between the second Hall sensor is variable according to the movement of the second movable lens barrel. Camera module.

The first magnet may be inclined along the direction in which the first magnet moves, and the second magnet may be inclined in the direction in which the second magnet moves.

The first magnet may be inclined toward the fixed lens barrel, and the second magnet may be arranged inclined toward the base.

One end of the first magnet may protrude toward the second movable lens barrel, and one end of the second magnet may protrude toward the first movable lens barrel.

The first magnet and the second magnet may be disposed at positions rotated by a predetermined angle in opposite directions to a virtual vertical line perpendicular to the optical axis so as not to interfere with each other.

The first and second driving units may be disposed on opposite sides of the first and second position sensing units, respectively.

The plurality of guide pins include: a pair of first guide pins slidably supporting one upper end of the first and second movable lens barrels; And a pair of second guide pins slidably supporting the lower ends of the other sides of the first and second movable lens barrels.

A plurality of bearings may be disposed between the first and second movable lens barrels and the pair of first guide pins, and between the first and second movable lens barrels and the pair of second guide pins, respectively. .

The plurality of bearings may include a pair of first bearings rotatably disposed at an upper end of one side of the first movable lens barrel; A pair of second bearings rotatably arranged at the lower end of the other side of the first movable lens barrel; A pair of third bearings rotatably arranged at an upper end of one side of the second movable lens barrel; And a pair of fourth bearings rotatably disposed at the lower end of the other side of the second movable lens barrel.

The pair of first and second bearings are respectively inserted into V-shaped grooves formed in the first movable lens barrel, and provided with a pair of shaft protrusions which are rotation centers on both sides, and the pair of third and third bearings Each of the four bearings is inserted into a V-shaped groove formed in the second movable lens barrel, and a pair of shaft protrusions serving as rotation centers on both sides may be provided.

According to the above-described embodiment of the present invention, while maintaining the compact size of the camera module, there is an advantage that it is possible to precisely control a plurality of lens barrels moving within a short movement distance in order to implement optical zoom.

1 is a perspective view showing a camera module according to an embodiment of the present invention.
2 and 3 are perspective views, respectively, showing the camera module in a state in which the case is removed in FIG. 1.
4 is a bottom view of the camera module in a state in which the first and second coils are omitted in FIG. 2.
FIG. 5 is a side view showing the camera module in a state in which the case is removed in FIG. 1.
6 is a cross-sectional view taken along line AA shown in FIG. 5.
7 is an exploded perspective view showing an example in which a first magnet is coupled to an upper portion of the first movable lens barrel.
FIG. 8 is a cross-sectional view taken along the line BB shown in FIG. 6, and is a schematic view showing the distance from the hall sensor when the magnet moves in the C1 and C2 directions.

Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings. The embodiments described herein can be variously modified. Certain embodiments are depicted in the drawings and may be described in detail in the detailed description. However, the specific embodiments disclosed in the accompanying drawings are only for easy understanding of various embodiments. Therefore, it is to be understood that the technical spirit is not limited by the specific embodiments disclosed in the accompanying drawings, and includes all equivalents or substitutes included in the spirit and technical scope of the invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but these components are not limited by the above-described terms. The above-mentioned terms are used only for the purpose of distinguishing one component from other components.

In this specification, the terms "comprises" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described in the specification, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance. When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

In addition, in describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof are abbreviated or omitted.

The camera module according to an embodiment of the present invention may be installed in a small digital device such as a smart phone, and may be formed in a compact size.

A configuration of a camera module according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.

The camera module 1 according to an embodiment of the present invention includes a base 10, a fixed lens barrel 20 disposed at a predetermined distance to the base 10, and a base 10 and a fixed lens barrel 20 Between the first and second movable lens barrels 40 and 60 arranged linearly and reciprocally along the optical axis direction, and a first position detecting unit 50 for sensing the position of the first movable lens barrel 40 , The second position detection unit 70 for sensing the position of the second movable lens barrel 60, the first driving unit 80 for driving the first movable lens barrel 40, and the second movable lens barrel A second driving unit 90 for driving the 60 may be included.

An image sensor (not shown) and an infrared cut filter 11 may be disposed on the base 10. The infrared cut filter 11 is disposed in front of the image sensor to filter infrared rays from light incident through the first to third lenses L1, L2, and L3.

The fixed lens barrel 20 is spaced apart from the base 10 so that the first and second movable lens barrels 40 and 60 can move linearly by a predetermined distance between the base 10 and the fixed lens barrel 20. Is placed.

The fixed lens barrel 20 may be connected to the base 10 at regular intervals from the base 10 by a plurality of first and second guide pins 31 and 33 formed in a straight shape.

The first lens L1 is coupled to the fixed lens barrel 20. The first lens L1 may be disposed on the optical axis together with the second lens L2 of the first movable lens barrel 40 and the third lens L3 of the second movable lens barrel 60.

The pair of first guide pins 31 and the pair of second guide pins 33 are arranged in parallel with each other, and both ends have one surface of the base 10 (a surface facing the second movable lens barrel 60). And one surface of the fixed lens barrel 20 (a surface opposite to the first movable lens barrel 40).

In addition, the pair of first guide pins 31 are disposed adjacent to one lower end of the first and second movable lens barrels 40 and 60, and the pair of second guide pins 33 are first and first 2 The movable lens barrels 40 and 60 are disposed adjacent to the upper end of the other side.

A plurality of first bearings 32a may be disposed between the first movable lens barrel 40 and the pair of first guide pins 31. The first movable lens barrel 40 can be slidably moved to a pair of first guide pins 31 by a plurality of first bearings 32a.

Referring to FIG. 6, it is described that a plurality of first bearings 32a are provided with a pair in this embodiment. Each of the first bearing 32a is formed in a ball type, the shaft protrusion 32c protrudes from both sides, and is rotatably inserted into a V-shaped groove 40a formed on one side lower portion of the first movable lens barrel 40. The pair of shaft protrusions 32c are rotatably inserted into a pair of insertion grooves 40b extending to both sides of the V-shaped groove 40a, respectively. In addition, the first movable lens barrel 40 and the second guide A plurality of second bearings 34a may be disposed between the pins 33. The first movable lens barrel 40 can be slidably reciprocated to a pair of second guide pins 33 by a plurality of second bearings 34a.

Referring to FIG. 6, it is described that a plurality of second bearings 34a are provided with a pair in this embodiment. Each of the second bearings 34a is formed in a ball type, the axial projections 34c protrude from both sides, and is rotatably inserted into the V-shaped grooves 40c formed on the other side of the first movable lens barrel 40. The pair of shaft protrusions 34c are rotatably inserted into a pair of insertion grooves 40d extending to both sides of the V-shaped groove 40c.

Accordingly, the first movable lens barrel 40 is slidable in the optical axis direction along a pair of first and second guide pins 31 and 33 by a plurality of first and second bearings 32a and 34a. Can move.

A plurality of third bearings 32b may be disposed between the second movable lens barrel 60 and the first guide pin 31. The second movable lens barrel 60 is slidably moved to a pair of first guide pins 31 by a plurality of third bearings 32b.

In addition, a plurality of fourth bearings 34b may be disposed between the second movable lens barrel 60 and the second guide pin 33. The second movable lens barrel 60 can be slidably linearly reciprocated to a pair of second guide pins 33 by a plurality of fourth bearings 34b.

Although not shown in the drawing, a V-shaped groove in which a plurality of first and second bearings 32a and 34a are slidably inserted is formed at one lower portion and the other upper portion of the second movable lens barrel 60, respectively, On both sides, insertion grooves into which the axial projections 32c and 34c of the bearings 32a and 34a are rotatably inserted are respectively extended.

Accordingly, the second movable lens barrel 60, like the first movable lens barrel 40 described above, has a pair of first and second guide pins by a plurality of first and second bearings 32a and 34a ( 31,33) can be slidably moved in the optical axis direction.

The first movable lens barrel 40 is disposed between the fixed lens barrel 20 and the second movable lens barrel 60. As the second lens L2 is coupled to the first movable lens barrel 40, the second lens L2 may linearly reciprocate with the first movable lens barrel 40. Accordingly, the distance between the second lens L2 and the first lens L1 and the distance between the second lens L2 and the third lens L3 may be changed.

The second movable lens barrel 60 is disposed between the base 10 and the first movable lens barrel 40. As the third lens L3 is coupled to the second movable lens barrel 60, the third lens L3 may linearly reciprocate along with the second movable lens barrel 60. Accordingly, the distance between the third lens L3 and the image sensor of the base 10 and the distance between the third lens L3 and the second lens L2 may be changed.

In this case, the first and second movable lens barrels 40 and 60 may move simultaneously or only one of them along the optical axis. The camera module 1 according to an embodiment of the present invention adopts a structure in which the first and second movable lens barrels 40 and 60 individually linearly reciprocate along the optical axis as described above, and thus, the optical zoom function and automatic The focus adjustment function can be performed individually.

The first movable lens barrel 40 is sensed in real time by the first position detecting unit 50 during a stationary or moving state. Accordingly, the control unit (not shown) provided in the camera module 1 recognizes the position of the first movable lens barrel 40 in real time, and the first driving unit 80 for driving the first movable lens barrel 40. By controlling the driving, the position of the first movable lens barrel 40 can be accurately controlled.

The first position detecting unit 50 may include a first magnet 51 coupled to the first movable lens barrel 40 and a first Hall sensor 53 sensing movement of the first magnet 51. have.

The first magnet 51 is mounted to the coupling groove 43 formed on one side 41 of the first movable lens barrel 40.

The coupling groove 43 may be arranged to incline to one side based on the virtual vertical line 110 passing through the center of the second lens L2 as shown in FIG. 6. In this case, the first magnet 51 and the first hall sensor 53 are rotated by a first angle (α1, the first angle may be an acute angle) from one side of the virtual vertical line 110 to the second lens. It may be located on the virtual first straight line 120 passing through the center of (L2). Preferably, the center of the first magnet 51 and the center of the first Hall sensor 53 may be located on the virtual first straight line 120.

Referring to FIG. 5, the first magnet 51 has a rear end projecting a predetermined length from the rear end of the first movable lens barrel 40 toward the second movable lens barrel 60. In addition, the second magnet 71, which will be described later, also protrudes a predetermined length from the tip of the second movable lens barrel 60 toward the first movable lens barrel 40.

As described above, when the first and second movable lens barrels 40 and 60 are movable in a linear direction with each other while the first and second magnets 51 and 71 protrude from each other, the second magnet 71 is simulated. It is preferable that the first and second magnets 51 and 71 do not interfere with each other by arranging to be inclined to the other side based on the vertical line 110.

The first hall sensor 53 may be fixed to a portion (not shown) inside the case 30 so as to be disposed adjacent to the first magnet 51.

Referring to FIG. 8, the first magnet 51 coupled to the coupling groove 43 may be disposed to be inclined by a second angle α2 because the rear end is positioned higher than the front end. As such, as the first magnet 51 is inclined at a second angle α2 along the direction in which the first magnet 51 moves, the distance from the first Hall sensor 53 gradually changes when the first magnet 51 moves.

That is, when the first movable lens barrel 40 moves in one direction and the reverse direction, the interval between the first magnet 51 and the first Hall sensor 53 is the first interval d1 and the first interval d1 ), And a second interval d2 different from that of FIG.

Accordingly, even if the first magnet 51 moves a short distance in one direction and the reverse direction together with the first movable lens barrel 40, the intensity change of the magnetic field can be detected by the first Hall sensor 53, Even if the size (for example, length) of the camera module is not increased, the control of the first magnet 51 is possible.

The position of the second movable lens barrel 60 is sensed in real time by the second position detecting unit 70 during a stationary or moving state. Accordingly, the control unit determines the position of the second movable lens barrel 60 in real time and controls the driving of the second driving unit 90 for driving the second movable lens barrel 60, thereby controlling the second movable lens barrel 60. The position of can be accurately controlled.

The second position detecting unit 70 detects the movement of the second magnet 71 and the second magnet 71 mounted in the coupling groove 63 formed in one side 61 of the second movable lens barrel 60. It may include a second Hall sensor (73).

The defect groove 63 may be arranged to incline to the other side based on the virtual vertical line 110 as shown in FIG. 6. In this case, the second magnet 71 and the second Hall sensor 73 are rotated by a third angle (α3, the third angle may be an acute angle) from the virtual vertical line 110 to the other side. It may be located on the virtual second straight line 130 passing through the center of (L3). Preferably, the center of the second magnet 71 and the center of the second hall sensor 73 may be located on the virtual second straight line 130.

The second hall sensor 73 may be fixed to another part (not shown) inside the case 30 so as to be disposed adjacent to the second magnet 71.

Referring to FIG. 5, the second magnet 71 coupled to the coupling groove 63 may be disposed to be inclined by a fourth angle α4 because the tip is positioned higher than the rear end. As described above, as the second magnet 71 is inclined at a fourth angle α4 along the direction in which the second magnet 71 is moved, the distance from the second hall sensor 73 gradually changes when the second magnet 71 is moved.

That is, when the second movable lens barrel 60 moves in one direction and the reverse direction, the interval between the second magnet 71 and the second Hall sensor 73 is the third interval and the fourth interval different from the third interval Can be

When the second magnet 71 is inclined at a fourth angle α4 as described above, even if the second magnet 71 moves a short distance in one direction and the reverse direction with the second movable lens barrel 60, the second magnet 71 is removed. 2 Since the intensity change of the magnetic field can be detected by the hall sensor 73, it is possible to control the second magnet 71 without increasing the size (for example, length) of the camera module.

The first driving unit 80 may be disposed substantially opposite to the position of the first position sensing unit 50. The first driving unit 80 is applied to the first coil 81 when the current is applied to the first coil 81 and the first coil 81, which are disposed at predetermined intervals on the other side of the first movable lens barrel 40. It may include a first driving magnet 85 in response to the magnetic field to be formed.

The first coil 81 is fixed inside the case 30 while being wound on the first yoke 83.

The first driving magnet 85 is linearly moved together with the first movable lens barrel 40 as it is coupled to the other side of the first movable lens barrel 40 so as to face the first coil 81. The first driving magnet 85 is surrounded by the first shielding member 87 except for the surface facing the first coil 81.

The second driving unit 90 may be disposed substantially opposite to the position of the second position sensing unit 70. The second driving unit 90 is applied to the second coil 91 when the current is applied to the second coil 91 and the second coil 91 disposed at a predetermined interval on the other side of the second movable lens barrel 60. It may include a second driving magnet 95 that reacts to the magnetic field to be formed.

The second coil 91 is fixed to the inside of the case 30 while being wound on the second yoke 93.

The second driving magnet 95 is linearly moved together with the second movable lens barrel 60 as it is coupled to the other side of the second movable lens barrel 60 to face the second coil 91. The second driving magnet 95 is surrounded by the second shielding member 97 except for the surface facing the second coil 91.

The present invention configured as described above can implement a zoom function and a variable focus adjustment function in the following manner.

That is, when the first movable lens barrel 40 is moved in one direction and in the opposite direction by the first driving unit 80, the control unit changes the first movable lens barrel 40 through the first position sensing unit 50 in real time. ), It is possible to accurately move the first movable lens barrel 40 to a desired position by receiving the detection signal for the position and controlling the first driving unit 80 based on the detection signal.

Likewise, when the second movable lens barrel 60 is moved in one direction and the opposite direction by the second driving unit 90, the control unit may change the second movable lens barrel 60 through the second position sensing unit 70 in real time. ), It is possible to accurately move the second movable lens barrel 60 to a desired position by receiving the detection signal for the position and controlling the second driving unit 90 based on the detection signal.

1: Camera module 10: Base
11: Infrared cut filter 20: Fixed lens barrel
31,33: guide pins 32a, 32b, 34a, 34b: bearings
40: first movable lens barrel 50: first position detection unit
60: second movable lens barrel 70: second position detection unit
80: first drive unit 90: second drive unit
L1: First lens L2: Second lens
L3: third lens

Claims (10)

case;
A base disposed on one end of the case and mounted with an image sensor;
A fixed lens barrel disposed at the other end of the case and having a first lens;
A plurality of guide pins, both ends of which are connected to the base and the fixed lens barrel and arranged in parallel;
First and second movable lens barrels disposed movably along the plurality of guide pins between the base and the fixed lens barrel, each having second and third lenses;
First and second driving units for driving the first and second movable lens barrels, respectively; And
It includes; first and second position detection unit for sensing the position of the first and second movable lens barrel, respectively;
The first position sensing unit, the first Hall sensor fixed to the case, the first movable lens barrel coupled to the first movable lens barrel so that the distance between the first Hall sensor according to the movement of the variable 1 magnet,
The second position sensing unit, the second hole sensor fixed to the case, the second movable lens barrel coupled to the second movable lens barrel so that the distance between the second Hall sensor is variable according to the movement of the A camera module comprising a magnet. According to claim 1,
The first magnet is inclined along the direction in which the first magnet moves,
The second magnet is a camera module, characterized in that disposed in an inclined direction along the direction in which the second magnet moves. According to claim 2,
The first magnet is disposed to be inclined toward the fixed lens barrel,
The second magnet is a camera module, characterized in that disposed inclined toward the base. According to claim 3,
One end of the first magnet protrudes toward the second movable lens barrel,
The second magnet is a camera module, characterized in that one end protrudes toward the first movable lens barrel. According to claim 2,
The first magnet and the second magnet is a camera module, characterized in that arranged at a position rotated by a predetermined angle in the opposite direction to each other with respect to the virtual vertical line perpendicular to the optical axis so as not to interfere with each other. The method of claim 5,
The first and second driving units are respectively disposed on opposite sides of the first and second position sensing units, a camera module. The method of claim 6,
The plurality of guide pins,
A pair of first guide pins slidably supporting one upper end of the first and second movable lens barrels; And
And a pair of second guide pins slidably supporting the lower ends of the other side of the first and second movable lens barrels. The method of claim 7,
It characterized in that a plurality of bearings are disposed between the first and second movable lens barrels and the pair of first guide pins and between the first and second movable lens barrels and the pair of second guide pins, respectively. Camera module. The method of claim 8,
The plurality of bearings,
A pair of first bearings rotatably disposed at an upper end of one side of the first movable lens barrel;
A pair of second bearings rotatably arranged at the lower end of the other side of the first movable lens barrel;
A pair of third bearings rotatably arranged at an upper end of one side of the second movable lens barrel; And
And a pair of fourth bearings rotatably disposed at the lower end of the other side of the second movable lens barrel. The method of claim 9,
The pair of first and second bearings are respectively inserted into V-shaped grooves formed in the first movable lens barrel, and provided with a pair of shaft protrusions which are rotation centers on both sides,
The pair of third and fourth bearings are respectively inserted into a V-shaped groove formed in the second movable lens barrel, and a camera module, characterized in that a pair of shaft protrusions provided as rotation centers on both sides is provided.

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