CN107295225B - Camera module - Google Patents
Camera module Download PDFInfo
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- CN107295225B CN107295225B CN201710242537.2A CN201710242537A CN107295225B CN 107295225 B CN107295225 B CN 107295225B CN 201710242537 A CN201710242537 A CN 201710242537A CN 107295225 B CN107295225 B CN 107295225B
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- lens module
- image sensor
- lens
- module
- optical axis
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/51—Housings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Devices (AREA)
- Adjustment Of Camera Lenses (AREA)
Abstract
The camera module according to an embodiment of the present invention may arrange two lens modules in one housing equipped with two moving spaces, thereby improving reliability against external impact and the like, and may form a distance between optical centers of the two lens modules to be smaller than a width of the housing, thereby achieving miniaturization of size while employing the two lens modules.
Description
Technical Field
The present invention relates to a camera module.
Background
The camera module is basically used in mobile communication terminals such as smart phones, tablet PCs, and notebook computers.
Further, recently, a dual camera (dual camera) mounted with two camera modules has been disclosed, and such a dual camera is only designed in a form of simply grouping two independent camera modules in parallel.
This method causes the camera module to be large in size and weak against post-deformation and the like, and thus has a problem that additional reinforcement by a reinforcement member is required.
Disclosure of Invention
It is an object of an embodiment of the present invention to provide a camera module including: two lens modules can be used, reliability against external impact and the like can be improved, and the size can be reduced.
A camera module according to an embodiment of the present invention includes: a first lens module and a second lens module configured to independently photograph a subject; a housing provided with an inner space to accommodate the first lens module and the second lens module; wherein a shortest distance between an optical axis of the first lens module and an optical axis of the second lens module is smaller than a width of the housing.
A camera module according to another embodiment of the present invention includes: a first lens module and a second lens module configured to be independently movable in three directions perpendicular to each other; a housing provided with an inner space to accommodate the first lens module and the second lens module; the angle of view of the first lens module and the angle of view of the second lens module are configured to be different from each other, and a shortest distance between an optical axis of the first lens module and an optical axis of the second lens module is smaller than a width of the housing.
The camera module according to an embodiment of the present invention may arrange two lens modules in one housing equipped with two moving spaces, thereby improving reliability against external impact and the like, and may form a distance between optical centers of the two lens modules to be smaller than a width of the housing, thereby achieving miniaturization of size while employing the two lens modules.
The camera module according to an embodiment of the present invention can improve reliability against external impact and the like while employing two lens modules, and can be downsized.
Drawings
Fig. 1 is a partially exploded perspective view of a camera module according to an embodiment of the present invention.
Fig. 2 is a plan view of fig. 1.
Fig. 3a and 3b are perspective views illustrating a coupling structure of a printed circuit substrate and a case in a camera module according to an embodiment of the present invention.
Fig. 4 is a perspective view illustrating a case where two image sensors respectively have different sizes from each other in a camera module according to an embodiment of the present invention.
Fig. 5 is a perspective view illustrating a shape of a bonding pad of each image sensor in a camera module according to an embodiment of the present invention.
Fig. 6a and 6b are perspective views illustrating a modification of the image sensor in the camera module according to an embodiment of the present invention.
Fig. 7 is a perspective view showing a modification of the infrared filter in the camera module according to an embodiment of the present invention.
Fig. 8a and 8b are perspective views illustrating a configuration of a first actuator that moves each lens module in an optical axis direction in a camera module according to an embodiment of the present invention.
Fig. 9a and 9b are exploded perspective views of camera modules including second actuators for moving the respective lens modules in the optical axis direction and a direction perpendicular to the optical axis direction.
Fig. 10 is an exploded perspective view of a second actuator in a camera module according to an embodiment of the present invention.
Fig. 11 is a perspective view illustrating a case where two lens modules are fixed focus lens modules that do not move in the optical axis direction in a camera module according to an embodiment of the present invention.
Description of the symbols
100: the housing 210: first lens module
230: the second lens module 300: first actuator
400: image sensor module 410: first image sensor
430: second image sensor 450: printed circuit board
600: second actuator
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The inventive idea is not, however, limited to the presented embodiments.
For example, those skilled in the art who understand the idea of the present invention can propose other embodiments included in the idea of the present invention by addition, modification, or deletion of the constituent elements, and this is also included in the idea of the present invention.
The same reference numerals are used to describe functionally equivalent constituent elements within the same concept shown in the drawings of the respective embodiments.
Fig. 1 is a partially exploded perspective view of a camera module according to an embodiment of the present invention, and fig. 2 is a plan view of fig. 1.
Referring to fig. 1 and 2, a camera module according to an embodiment of the present invention includes a first lens module 210, a second lens module 230, a case 100 for housing the first and second lens modules 210 and 230, and an image sensor module 400 for converting light incident through the first and second lens modules 210 and 230 into an electrical signal.
The first lens module 210 and the second lens module 230 respectively include barrels 210a and 230a that accommodate a plurality of lenses, and bobbins (bobbins) 210b and 230b (see fig. 6b) that are fixedly coupled to the barrels 210a and 230 a.
At least one of the first and second lens modules 210 and 230 is movably received inside the housing 100 to achieve focusing or anti-shake.
In the case where both the first lens module 210 and the second lens module 230 are movably configured, the first lens module 210 and the second lens module 230 are independently movably configured, respectively.
In addition, the first and second lens modules 210 and 230 are configured to have different angles of view from each other.
For example, an angle of view of one of the first and second lens modules 210 and 230 may be configured to be relatively wide (wide-angle lens), and an angle of view of the other lens may be configured to be relatively narrow (telephoto lens).
As described above, it is designed that the two lens modules have different angles of view from each other, so that images of a subject can be captured at various depths.
Further, by using two images for one subject (for example, combining), a high-resolution image or a bright image can be generated, and further, an image of the subject can be clearly captured even in a low-illuminance environment.
Further, a 3D image can be realized with a plurality of images, and a zoom function can be realized.
The housing 10 accommodates all of the first and second lens modules 210 and 230, and two movement spaces are formed inside the housing 100 so that the first and second lens modules 210 and 23 can move independently from each other.
The case 100 includes a first case 110 and a second case 120 combined with the first case 110.
The first housing 110 accommodates a first lens module 210 and a second lens module 230. The first housing 110 has two receiving spaces for receiving the first lens module 210 and the second lens module 230.
The second housing 120 is combined with the first housing 100 and functions to protect internal constituent components of the camera module.
The image sensor module 400 is a device that converts light passing through the first and second lens modules 210 and 230 into an electrical signal.
In one example, the image sensor module 400 may include: a printed circuit substrate 450; a first image sensor 410 and a second image sensor 430 connected to a printed circuit substrate 450; two infrared filters 470a, 470b (see fig. 6 b).
The respective image sensors 410 and 430 convert light incident through the respective lens modules 210 and 230 into electrical signals. In one example, each image sensor 410, 430 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS).
Either one of the first image sensor 410 and the second image sensor 430 may be a color (RGB) sensor, and the other may be a black-and-white (BW) sensor.
In an example, the first image sensor 410 may be a color (RGB) sensor and the second image sensor 430 may be a Black and White (BW) sensor. In this case, Fno (F number, a numerical value indicating brightness of a lens or a numerical value indicating an amount of light transmitted by a lens) of the lens of the first lens module 210 corresponding to the first image sensor 410 may be relatively large, and Fno (F number) of the lens of the second lens module 230 corresponding to the second image sensor 430 may be relatively small.
Accordingly, an image having a deep focal depth may be captured by the first lens module 210 and the first image sensor 410, and a bright image may be captured by the second lens module 230 and the second image sensor 430, and thus, an image having a deep focal depth and a bright image may be generated by combining the two images.
In addition, the diagonal length of each image sensor 410, 430 may be 1/2.5 "or less.
Also, the ratio of the length of the long side to the length of the short side of each image sensor 410, 430 may be 4:3 or 16: 9.
The infrared filters 470a, 470b are disposed at positions corresponding to the respective image sensors 410, 430, thereby functioning to block light of an infrared region from light incident through the respective lens modules 210, 230.
The infrared filters 470a and 470b may be attached to a lower portion of the first housing 110.
The printed circuit substrate 450 is combined with the first housing 110. The printed circuit board 450 is one printed circuit board 450 corresponding to the size of the first housing 110, and two image sensors 410 and 430 are mounted on the one printed circuit board 450.
Referring to fig. 2, a distance D1 between the optical center of the first lens module 210 and the optical center of the second lens module 230 is formed to be smaller than a width D2 of the housing 100.
Also, the shortest distance D1 between the optical axis of the first lens module 210 and the optical axis of the second lens module 230 is formed to be smaller than the width D2 of the housing 100.
Here, the optical center indicates a point where light intersects the optical axis of each lens module 210, 230, and the width indicates the length of the side of the shorter side among the sides of the housing 100 with reference to fig. 2.
In order to generate a high-resolution image or a bright image using two images captured by two lens modules, it is preferable to design the distance between the optical centers of the two lens modules to be short.
In an example, in a case where the distance between the optical centers of two lens modules is designed to be long, two images for one object may be photographed to be different from each other, and thus it may be difficult to generate a high-resolution image or a bright image.
Thus, in the camera module according to an embodiment of the present invention, it may be designed that the distance D1 between the optical center of the first lens module 210 and the optical center of the second lens module 230 is smaller than the width D2 of the housing 100, so that diverse images can be generated with two images for one object.
Fig. 3a and 3b are perspective views illustrating a coupling structure of a printed circuit substrate and a case in a camera module according to an embodiment of the present invention.
Referring to fig. 3a and 3b, the printed circuit substrate 450 may be inserted into the first housing 110.
In one example, the printed circuit substrate 450 is inserted into the first housing 110 such that the side surface thereof contacts the inner surface of the first housing 110.
The printed circuit board 450 may be a Rigid Flexible printed circuit board (a "Rigid Flexible PCB"), and in the camera module according to an embodiment of the present invention, the two image sensors 410 and 430 are mounted on the printed circuit board 450, so that the size of the printed circuit board 450 becomes larger than that of a case where one image sensor is mounted.
Therefore, deformation or the like may occur in the printed circuit substrate 450 due to external impact or the like, and similarly, it may be difficult to ensure reliability due to external impact or the like.
However, in the camera module according to an embodiment of the present invention, the printed circuit substrate 450 may be inserted and disposed inside the first housing 110, thereby preventing deformation from occurring at the printed circuit substrate 450 due to external impact or the like.
Also, a bonding surface between the printed circuit substrate 450 and the first case 110 may be coated with an adhesive to improve a bonding force between the printed circuit substrate 450 and the first case 110.
Fig. 4 is a perspective view illustrating a case where two image sensors respectively have different sizes from each other in a camera module according to an embodiment of the present invention.
Referring to fig. 4, diagonal lengths of two image sensors 410, 430 equipped in a camera module according to an embodiment of the present invention may be different from each other.
It is possible to design that the diagonal length of one of the two image sensors 410, 430 is shorter, thereby reducing the size of the image sensor and accordingly the overall size of the camera module can be reduced.
In addition, the Pixel sizes (Pixel sizes) of the two image sensors 410, 430 may be different from each other. In one example, when the first image sensor 410 is a color (RGB) sensor and the second image sensor 430 is a Black and White (BW) sensor, the pixel size of the second image sensor 430 is smaller than the pixel size of the first image sensor 410.
In this case, the lens of the first lens module 210 corresponding to the first image sensor 410 is configured to have a relatively large Fno (a numerical value indicating the brightness of the lens), and the lens of the second lens module 230 corresponding to the second image sensor 430 is configured to have a relatively small Fno.
Since the Fno of the lens of the second lens module 230 is relatively small, a bright image can be photographed, and thus, even if the pixel size of the second image sensor 430 is configured to be relatively small, a bright image can be photographed.
Therefore, the two images can be combined to generate an image having a deep and bright focal depth, and the entire size of the camera module can be reduced.
Fig. 5 is a perspective view illustrating a shape of a bonding sheet of each image sensor in a camera module according to an embodiment of the present invention.
The two image sensors 410, 430 equipped in the camera module according to an embodiment of the present invention are electrically connected to the printed circuit substrate 450 by means of bonding wires.
A bonding pad P connected to the bonding wire is formed at each of the image sensors 410 and 430, and the bonding pad P is disposed at an edge position of each of the image sensors 410 and 430.
In an example, the bond sheet P may be arranged at an edge position of a long side or a short side among edge positions of the respective image sensors 410, 430.
In either one of the two image sensors 410, 430, the bonding sheet P may be arranged at the long side; in another image sensor, the bonding sheet P may be disposed at the short side.
In the camera module according to an embodiment of the present invention, the bonding pads P may not be disposed on all four sides of the image sensor, but may be disposed on a long side or a short side, thereby reducing a space occupied by the bonding wires. Accordingly, the overall size of the camera module can be reduced.
Fig. 6a and 6b are perspective views illustrating a modification of the image sensor in the camera module according to an embodiment of the present invention.
Unlike the above-described embodiments, the image sensor 420 of the embodiment of fig. 6a and 6b may be provided as one image sensor 420 having two effective photographing regions 410', 430' corresponding to the two lens modules 210, 230.
In the present embodiment, one image sensor 420 forms a dummy area 420a between two effective photographing areas 410', 430', and the bonding sheet P may be arranged perpendicular to the length direction of the dummy area 420 a.
Fig. 7 is a perspective view showing a modification of the infrared filter in the camera module according to an embodiment of the present invention.
Unlike the above-described embodiment, the infrared filter 470 of the embodiment of fig. 7 may be provided as one infrared filter 470 to correspond to all of the one image sensor 420 (or the two image sensors 410, 430) having the two effective photographing regions 410', 430'.
One infrared filter 470 may be provided to correspond to all of the one image sensor 420 (or the two image sensors 410, 430) having the two effective photographing regions 410', 430', thereby reducing the number of processes and improving productivity.
Fig. 8a and 8b are perspective views illustrating a configuration of a first actuator that moves each lens module in an optical axis direction in a camera module according to an embodiment of the present invention.
Referring to fig. 8a and 8b, a camera module according to an embodiment of the present invention includes a first actuator 300 that moves each lens module 210, 230 in an optical axis direction (Z direction).
The first actuator 300 may move the first lens module 210 and the second lens module 230 in the optical axis direction (Z direction), respectively, independently.
The focal length can be adjusted by moving the first and second lens modules 210 and 230 in the optical axis direction (Z direction), respectively, by means of the first actuator 300.
The first actuator includes coils 310a, 330a and magnets 310b, 330b, and can move the first and second lens modules 210 and 230 in the optical axis direction (Z direction) by means of electromagnetic influence between the coils 310a, 330a and the magnets 310b, 330 b.
The two coils 310a and 330a are fixed to the case 100 via the substrate 350.
The substrate 350 is provided as one substrate 350 provided with the two coils 310a, 330a, and the one substrate 350 is fixed to a longer-length face among the side faces of the case 100.
The two coils 310a and 330a are provided on one surface of the substrate 350.
Two magnets 310b, 330b are fixedly disposed at one side of each lens module 210, 230, and each magnet 310b, 330b is disposed to face each coil 310a, 330a in a direction perpendicular to the optical axis direction (Z direction).
Between the two yokes 360a, 360b and the two magnets 310b, 330b, there is an attractive force in a direction perpendicular to the optical axis direction (Z direction).
Accordingly, a ball member 510, which will be described later, can maintain a contact state with the first and second lens modules 210 and 230 and the housing 100 by means of an attractive force between the two yokes 360a and 360b and the two magnets 310b and 330 b.
The yokes 360a and 360b also serve to concentrate the magnetic force of the magnets 310b and 330 b. In one example, the two yokes 360a and 360b and the two magnets 310b and 330b may correspond to each other one-to-one to form a magnetic circuit (magneticc). Accordingly, magnetic leakage can be prevented from occurring, and magnetic fields formed by the respective magnets 310b, 330b can be prevented from interfering with each other.
At this time, it is preferable that the length of each yoke 360a, 360b in the optical axis direction (Z direction) is longer than the length of each magnet 310b, 330b in the optical axis direction (Z direction).
If the optical axis direction (Z direction) length of the yokes 360a and 360b is shorter than the optical axis direction length of the magnets 310b and 330b, the attractive force acting so that the centers of the magnets 310b and 330b face the centers of the yokes 360a and 360b when the magnets 310b and 330b move in the optical axis direction (Z direction) becomes large.
Therefore, the restoring force to return the magnets 310b, 330b to the original positions acts stronger, so that the amount of current required to move the magnets 310b, 330b increases, thereby increasing power consumption.
However, as the camera module according to the embodiment of the present invention, if the optical axis direction (Z direction) length of the yokes 360a and 360b is longer than the optical axis direction (Z direction) length of the magnets 310b and 330b, the attractive force acting to direct the centers of the magnets 310b and 330b toward the centers of the yokes 360a and 360b becomes relatively small, and thus power consumption can be relatively reduced.
In addition, although not shown in the drawings, the two coils 310a, 330a may be arranged symmetrically to each other at facing sides of the case 100. In this case, two substrates may be provided corresponding to the two coils 310a, 330a, and each substrate may be provided with one coil and fixed to the case 100, respectively.
A plurality of ball members 510 are arranged between the housing 100 and the respective lens modules 210, 230 to guide movement in the optical axis direction (Z direction) of the respective lens modules 210, 230.
The plurality of ball members 510 are arranged in the optical axis direction (Z direction) and contact the housing 100 and the respective lens modules 210 and 230, thereby guiding the movement of the respective lens modules 210 and 230.
Here, as shown in fig. 8a, the lens barrels 210a, 230a and the bobbin 210b, 230b may be provided as separate parts and coupled to each other to constitute the respective lens modules 210, 230, but as shown in fig. 8b, the lens barrels 210a, 230a and the bobbin 210b, 230b may also be provided as one part integrally formed and constitute the respective lens modules 210, 230.
In the configuration shown in fig. 8a, if the lens barrels 210a, 230a are broken in a state where the lens barrels 210a, 230a are coupled to the coil bobbins 210b, 230b, the lens barrels 210a, 230a can be separated from the coil bobbins 210b, 230b, and thus the repair of the camera module can be facilitated.
Further, in the configuration shown in fig. 8b, since it is not necessary to perform a process of coupling the barrels 210a and 230a and the bobbins 210b and 230b to each other, it is possible to reduce the number of working processes and thus improve productivity.
In addition, although fig. 8a and 8b show a configuration in which both the lens modules 210 and 230 can move in the optical axis direction (Z direction), only one of the two lens modules 210 and 230 may be configured to be movable in the optical axis direction (Z direction) and the remaining one may be fixed to the housing 100 without moving in the optical axis direction (Z direction).
Fig. 9a and 9b are exploded perspective views of camera modules including second actuators for moving the respective lens modules in the optical axis direction and a direction perpendicular to the optical axis direction.
Also, fig. 10 is an exploded perspective view of a second actuator in a camera module according to an embodiment of the present invention.
First, referring to fig. 9a and 9b, the camera module according to an embodiment of the present invention includes a second actuator 600 for moving each of the lens modules 210 and 230 in three directions (X, Y, Z directions) perpendicular to each other.
The second actuator 600 moves each lens module 210, 230 in the optical axis direction (Z direction), a first direction (X direction) perpendicular to the optical axis direction (Z direction), and a second direction (Y direction). Wherein the first direction (X direction) and the second direction (Y direction) are directions perpendicular to each other.
The second actuator 600 may move the first lens module 210 and the second lens module 230 in the optical axis direction (Z direction), the first direction (X direction), and the second direction (Y direction), respectively and independently.
The first lens module 210 and the second lens module 230 can be moved in the optical axis direction (Z direction) by the second actuator 600 to adjust the focal length, respectively, and can be moved in the first direction (X direction) and the second direction (Y direction) to correct hand shake or the like.
The second actuator 600 includes a coil 610a and a magnet 610b for focus (hereinafter, AF) and a coil 620a and a magnet 620b for shake correction (hereinafter, OIS).
In the embodiment of fig. 9a and 9b, in order to move the respective lens modules 210 and 230 along three directions perpendicular to each other, the embodiment includes: a first frame 240 and a second frame 250 that move along the optical axis direction (Z direction) together with the lens modules 210 and 230; the first guide member 260 and the second guide member 270 guide the lens modules 210 and 230 to move in the first direction (X direction) and the second direction (Y direction).
The first lens module 210 and the first guide member 260 are accommodated in the first frame 240, and the first lens module 210, the first guide member 260, and the first frame 240 move together along the optical axis direction (Z direction) when focusing is performed.
The second lens module 230 and the second guide member 270 are accommodated in the second frame 250, and the second lens module 230, the second guide member 270, and the second frame 250 move together along the optical axis direction (Z direction) when focusing is performed.
In the shake correction, the first lens module 210 and the first guide member 260 move in the first frame 240 in a direction perpendicular to the optical axis direction (Z direction), and the second lens module 230 and the second guide member 270 move in the second frame 250 in a direction perpendicular to the optical axis direction (Z direction).
In addition, in order to prevent the first lens module 210 and the first guide member 260 from being separated from the first frame 240 or the second lens module 230 and the second guide member 270 from being separated from the second frame 250 due to external impact, etc., stoppers 280 and 290 are provided.
The stoppers 280 and 290 are coupled to the first and second frames 240 and 250 in a manner of covering at least a portion of the upper surfaces of the first and second lens modules 210 and 230.
The stoppers 280 and 290 may be provided with buffer members 280a and 290 a. The buffer members 280a, 290a function to buffer noise, impact, and the like generated when the first frame 240 and the second frame 250 collide with the housing 100 while moving in the optical axis direction (Z direction).
The buffer members 280a and 290a may be configured to buffer noise, impact, and the like generated when the first lens module 210 disposed in the first frame 240 and the second lens module 240 disposed in the second frame 250 collide with the stoppers 280 and 290.
For example, the buffer members 280a, 290a may protrude from one surface (e.g., an upper surface) and the other surface (e.g., a lower surface) of the stoppers 280, 290, and may be made of an elastic material.
The buffer members 280a and 290a protruding from one surface of the stoppers 280 and 290 can buffer noise, impact, and the like with respect to the housing 100, and the buffer members 280a and 290a protruding from the other surface of the stoppers 280 and 290 can buffer noise, impact, and the like with respect to the first and second lens modules 210 and 230.
In addition, as shown in fig. 9a and 9b, the lens barrel and the bobbin may be provided as one integrally formed component, thereby constituting the respective lens modules 210, 230.
In the above-described structure, a process of coupling the lens barrel and the bobbin to each other is not required, and thus the number of working processes can be reduced, and productivity can be improved accordingly.
Although not shown in the drawings, the lens barrel and the bobbin may be provided as separate parts to be coupled to each other, thereby constituting the respective lens modules 210, 230.
In the above configuration, if the lens barrel is broken in a state where the lens barrel and the bobbin are coupled, the lens barrel can be separated from the bobbin, and therefore, repair of the camera module can be facilitated.
The structure of the second actuator 600 and the moving manner of the lens modules 210 and 230 will be described with reference to fig. 10.
For reference, although the first lens module 210 is described as a reference in fig. 10 for convenience of description, the second lens module 230 is moved in the same manner as the first lens module 210.
The first lens module 210 is moved in the optical axis direction (Z direction) by the second actuator 600 for focusing.
The second actuator 600 includes a magnet 610b and a coil 610a that generate a driving force for focusing.
The magnet 610b is mounted to the first frame 240. In one example, the magnet 610b may be mounted to one side of the first frame 240.
The coil 610a is mounted to the housing 100 so as to face the magnet 610 b. In one example, the coil 610a may be mounted to the case 100 via a substrate 610 c. The substrate 610c is mounted on the case 100, and the coil 610a is provided on one surface of the substrate 610 c.
The magnet 610b is a moving member attached to the first frame 240 and moving in the optical axis direction (Z direction) together with the first frame 240, and the coil 610a is a fixed member fixed to the housing 100.
When power is applied to the coil 610a, the first frame 240 may be moved in the optical axis direction (Z direction) by an electromagnetic influence between the magnet 610b and the coil 610 a.
Since the first lens module 210 is accommodated in the first frame 240, the first lens module 210 also moves in the optical axis direction (Z direction) in accordance with the movement of the first frame 240
A ball member 510' is disposed between the first frame 240 and the housing 100 in order to reduce friction between the first frame 240 and the housing 100 when the first frame 240 moves.
Ball members 510' are disposed on both sides of the magnet 610 b.
The present invention adopts a closed-loop control method of sensing the position of the first lens module 210 for feedback.
Thus, the position sensor 610d is required for closed loop control. The position sensor 610d may be a hall sensor, and may sense the position of the first lens module 210 through a change in magnetic flux of the magnet 610b mounted to the first lens module 210.
The position sensor 610d is disposed inside or outside the coil 610a, and may be mounted to a substrate 610c on which the coil 610a is mounted.
During focusing, the first lens module 210 can advance and retreat (i.e., can move in both directions) in the optical axis direction (Z direction).
The first lens module 210 is moved in the first direction (X direction) and the second direction (Y direction) by the second actuator 600 for shake correction.
For example, if a shake occurs at the time of photographing an image due to a hand shake of a user or the like, the second actuator 600 imparts a relative displacement corresponding to the shake to the first lens module 210 to compensate for the shake.
The first guide member 260 is accommodated in the first frame 240, and the first guide member 260 functions to guide the movement of the first lens module 210.
The first guide member 260 and the first lens module 210 are inserted into the first frame 240. The first guide member 260 and the first lens module 210 are configured to be movable together in a first direction (X direction) within the first frame 240, and the first lens module 210 is configured to be movable in a second direction (Y direction) with respect to the first guide member 260.
The second actuator 600 includes a plurality of magnets 620b and a plurality of coils 620a that generate driving force for shake correction.
Among the plurality of magnets 620b and the plurality of coils 620a, a portion is arranged to face in the first direction (X direction) to generate a driving force in the first direction (X direction), and the rest is arranged to face in the second direction (Y direction) to generate a driving force in the second direction (Y direction).
The plurality of magnets 620b are mounted to the first lens module 210, and the plurality of coils 620a facing the plurality of magnets 620b are mounted to the housing 100 via the substrate 620 c.
The plurality of magnets 620b are moving members that move in the first direction (X direction) and the second direction (Y direction) together with the first lens module 210, and the plurality of coils 620a are fixed members that are fixed to the housing 100.
In addition, the present invention provides a plurality of ball members supporting the first guide member 260 and the first lens module 210. The plurality of ball members play a role of guiding the first guide member 260 and the first lens module 210 in the shake correction process. Further, the first frame 240, the first guide member 260, and the first lens module 210 also function to maintain the distance in the optical axis direction (Z direction).
The plurality of ball members includes a first ball member 520 and a second ball member 530.
The first ball member 520 is disposed between the first frame 240 and the first guide member 260, and the second ball member 530 is disposed between the first guide member 260 and the first lens module 210.
The first ball member 520 guides the movement of the first guide member 260 and the first lens module 210 in the first direction (X direction), and the second ball member 530 guides the movement of the first lens module 210 in the second direction (Y direction).
In one example, in the case where the driving force in the first direction (X direction) is generated, the first ball member 520 makes a rolling motion in the first direction (X direction). Accordingly, the first ball member 520 guides the movement of the first guide member 260 and the first lens module 210 in the first direction (X direction).
Also, in the case where the driving force is generated in the second direction (Y direction), the second ball member 530 makes a rolling motion in the second direction (Y direction). Accordingly, the second ball member 530 guides the movement of the first lens module 210 in the second direction (Y direction).
First guide groove portions 520a that accommodate the respective first ball members 520 are formed on the surfaces of the first frame 240 and the first guide member 260 that face each other in the optical axis direction (Z direction).
The first ball member 520 is received in the first guide groove portion 520a and inserted between the first frame 240 and the first guide member 260.
In the state of being accommodated in the first guide groove portion 520a, the first ball member 520 is restricted from moving in the optical axis direction (Z direction) and the second direction (Y direction) and is movable only in the first direction (X direction). In one example, the first ball member 520 can only roll in the first direction (X direction).
For this, the planar shape of the first guide groove part 520a may be a rectangle having a length in the first direction (X direction) greater than a width in the second direction (Y direction).
Second guide groove portions 530a for accommodating the respective second ball members 530 are formed on surfaces of the first guide member 260 and the first lens module 210 facing each other in the optical axis direction (Z direction).
The second ball member 530 is received by the second guide groove portion 530a and inserted between the first guide member 260 and the first lens module 210.
In the state of being accommodated in the second guide groove portion 530a, the second ball member 530 is restricted from moving in the optical axis direction (Z direction) and the first direction (X direction) and is movable only in the second direction (Y direction). In one example, the second ball member 530 can only perform a rolling motion in the second direction (Y direction).
For this, the planar shape of the second guide groove part 530a may be a rectangle having a length in the second direction (Y direction) greater than a width in the first direction (X direction).
When a driving force is generated in the first direction (X direction), the first guide member 260 and the first lens module 210 move together in the first direction (X direction).
Wherein the first ball member 520 performs a rolling motion along the first direction (X direction). At this time, the movement of the second ball member 530 is restricted.
And, when the driving force is generated in the second direction (Y direction), the first lens module 210 moves in the second direction (Y direction).
Here, the second ball member 530 performs a rolling motion in the second direction (Y direction). At this time, the movement of the first ball member 520 is restricted.
As described above, in the shake correction process, the first lens module 210 can be moved in both the first direction (X direction) and the second direction (Y direction) by restricting the movement of the ball member.
In the shake correction process, the present invention adopts a closed-loop control method of sensing the position of the first lens module 210 for feedback.
Accordingly, a position sensor 620d for closed-loop control is provided, and the position sensor 620d may be arranged inside the plurality of coils 620 a.
The position sensor 620d may be a hall sensor, and the position sensor 620d may sense the position of the first lens module 210 through a change in magnetic flux of the plurality of magnets 620 b.
Also, the present invention provides a yoke portion 240a that generates an optical axis direction (Z direction) attractive force to the plurality of magnets 620b for shake correction. The yoke part 240a may be a magnetic body.
The yoke part 240a is fixed to the first frame 240, and faces the plurality of magnets 620b for shake correction in the optical axis direction (Z direction).
Therefore, an attractive force is generated between the yoke portion 240a and the plurality of magnets 620b along the optical axis direction (Z direction).
The first lens module 210 is pressurized in a direction toward the yoke part 240a by an attractive force between the yoke part 240a and the plurality of magnets 620b, and thus the first lens module 210, the first guide member 260, and the first frame 240 may maintain a contact state with the first ball member 520 and the second ball member 530.
For example, the first lens module 210 is pressurized toward the first guide member 260 by the attractive force between the yoke part 240a and the plurality of magnets 620b, whereby the first guide member 260 is pressurized toward the first frame 240.
Fig. 11 is a perspective view illustrating a case where two lens modules are fixed focus lens modules that do not move in the optical axis direction in a camera module according to an embodiment of the present invention.
Referring to fig. 11, in a camera module according to an embodiment of the present invention, two lens modules 210', 230' may be provided in a state in which a focal length is fixed.
In the embodiment of fig. 11, the Fno (F number, a numerical value indicating the brightness (amount of light transmitted) of the lens) values of the two lens modules 210', 230' may be designed to be large so that the subject depth (distance range in which clear photographing is possible) becomes large.
In general, when the Fno value is large, the brightness of the lens becomes dark, and it is difficult to capture a clear image in a low-illuminance environment.
However, in the camera module according to an embodiment of the present invention, since a clear one image can be generated using the images photographed by the two lens modules 210 'and 230', a clear image can be obtained in a low illuminance environment even if the Fno value is made large.
In addition, in the above configuration, since an actuator for moving each of the lens modules 210 'and 230' is not required, the camera module can be miniaturized.
While the configuration and features of the present invention have been described above with reference to the embodiments according to the present invention, the present invention is not limited thereto, and those skilled in the art to which the present invention pertains will clearly understand that various changes and modifications can be made within the spirit and scope of the present invention, and therefore, the above changes and modifications fall within the scope of the claims.
Claims (11)
1. A camera module, comprising:
a first lens module and a second lens module configured to independently photograph a subject;
a housing having an inner space to accommodate the first lens module and the second lens module;
an image sensor module configured to convert light passing through the first and second lens modules into an electrical signal and to be coupled to the housing,
the image sensor module includes: a first image sensor corresponding to the first lens module; a second image sensor corresponding to the second lens module; a printed circuit board on which the first image sensor and the second image sensor are mounted,
alternatively, the image sensor module includes: an image sensor having a first photographing region corresponding to the first lens module and a second photographing region corresponding to the second lens module; a printed circuit board on which the image sensor is mounted,
a shortest distance between an optical axis of the first lens module and an optical axis of the second lens module is smaller than a width of the housing,
the first image sensor or the first photographing region is a color sensor, the second image sensor or the second photographing region is a black-and-white sensor,
assuming that a numerical value representing luminance of lenses constituting the first lens module and the second lens module is Fno, the Fno of the first lens module is configured to be larger than the Fno of the second lens module,
the pixel size of the second image sensor or the second photographing region is smaller than the pixel size of the first image sensor or the first photographing region.
2. The camera module of claim 1,
the diagonal length of the first image sensor and the diagonal length of the second image sensor are configured to be different from each other.
3. The camera module of claim 1, further comprising:
a first actuator generating a driving force to move the first and second lens modules in an optical axis direction, respectively, and including magnets attached to the first and second lens modules, respectively, and coils arranged to face the magnets.
4. The camera module of claim 3,
the first actuator includes a substrate fixed to a longest-length surface among side surfaces of the case, and the coil is provided on the substrate.
5. The camera module of claim 1, further comprising:
a second actuator generating a driving force to move the first and second lens modules in first and second directions perpendicular to an optical axis direction, respectively, and including a plurality of magnets attached to the first and second lens modules and a plurality of coils arranged to face the plurality of magnets.
6. The camera module of claim 5, further comprising:
a first frame configured to accommodate the first lens module and movable in the optical axis direction together with the first lens module in the housing;
a first guide member arranged in the first frame and movable in the optical axis direction together with the first frame;
the first lens module and the first guide member are configured to be movable in the first direction within the first frame,
the first lens module is configured to be movable in the second direction with respect to the first guide member.
7. The camera module of claim 6,
a plurality of ball members are disposed between the first frame and the first guide member, and between the first guide member and the first lens module.
8. The camera module of claim 5, further comprising:
a second frame configured to accommodate the second lens module and movable in the optical axis direction together with the second lens module in the housing;
a second guide member arranged in the second frame and movable in the optical axis direction together with the second frame;
the second lens module and the second guide member are configured to be movable in the first direction within the second frame,
the second lens module is configured to be movable in the second direction with respect to the second guide member.
9. The camera module of claim 8,
a plurality of ball members are disposed between the second frame and the second guide member, and between the second guide member and the second lens module.
10. The camera module of claim 1,
the printed circuit board is inserted and fixed in the shell.
11. A camera module, comprising:
a first lens module and a second lens module configured to be independently movable in three directions perpendicular to each other;
a housing provided with an inner space to accommodate the first lens module and the second lens module;
an image sensor module configured to convert light passing through the first and second lens modules into an electrical signal and to be coupled to the housing,
the image sensor module includes: a first image sensor corresponding to the first lens module; a second image sensor corresponding to the second lens module; a printed circuit board on which the first image sensor and the second image sensor are mounted,
alternatively, the image sensor module includes: an image sensor having a first photographing region corresponding to the first lens module and a second photographing region corresponding to the second lens module; a printed circuit board on which the image sensor is mounted,
an angle of view of the first lens module and an angle of view of the second lens module are configured to be different from each other,
a shortest distance between an optical axis of the first lens module and an optical axis of the second lens module is smaller than a width of the housing,
the first image sensor or the first photographing region is a color sensor, the second image sensor or the second photographing region is a black-and-white sensor,
assuming that a numerical value representing luminance of lenses constituting the first lens module and the second lens module is Fno, the Fno of the first lens module is configured to be larger than the Fno of the second lens module,
the pixel size of the second image sensor or the second photographing region is smaller than the pixel size of the first image sensor or the first photographing region.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2016-0045076 | 2016-04-12 | ||
| KR20160045076 | 2016-04-12 | ||
| KR1020160106216A KR101813393B1 (en) | 2016-04-12 | 2016-08-22 | Camera module |
| KR10-2016-0106216 | 2016-08-22 |
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| Publication Number | Publication Date |
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| CN107295225A CN107295225A (en) | 2017-10-24 |
| CN107295225B true CN107295225B (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710242537.2A Active CN107295225B (en) | 2016-04-12 | 2017-04-12 | Camera module |
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| CN111885294B (en) * | 2018-03-26 | 2022-04-22 | 华为技术有限公司 | Shooting method, device and equipment |
| CN114928688B (en) * | 2018-05-08 | 2024-06-11 | 宁波舜宇光电信息有限公司 | Array camera module, electronic equipment with array camera module and image processing method |
| TWI771811B (en) * | 2020-09-18 | 2022-07-21 | 大立光電股份有限公司 | Electronic device |
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| CN107295225A (en) | 2017-10-24 |
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