KR20150000180A - Camera module - Google Patents

Abstract

The present invention relates to a camera module capable of implementing at least two of the auto-focusing function, camera-shake correction function, and zooming function. The camera module according to an embodiment of the present invention includes: an image sensor; and first and second reflection members which respectively reflect the light entering through the image sensor once. The reflection surfaces of the first and second reflection members are integrated together and are deformed to take a curved shape when being applied with power to perform at least one of auto-focusing, motion compensating, and zooming functions.

Description

Camera module {Camera module}

This embodiment relates to a camera module.

Generally, a general camera module composed of a plurality of lenses is a refractive optical system, which limits the overall thickness of the optical system and has a chromatic aberration. Also, even if the system is calibrated and assembled based on the resolution of the center portion, the resolution of the peripheral portion can be lowered due to manufacturing tolerances between the lenses.

In order to realize a zoom function in a conventional refractive optical system, a plurality of lenses must be moved along an optical path. Therefore, an optical system having a zoom function has a relatively long optical path, which is contrary to miniaturization of optical system thickness.

Particularly, the additional implementation of the auto focusing function, the camera shake correction function, and the zoom function described above increases the size of the optical system, so that it is difficult to apply the zoom function to a camera module applied to a mobile device.

It is an object of the present invention to provide an ultra-small camera module which can have both an auto focusing function, an image stabilization function, and a zoom function, or a combination of at least two functions.

The camera module according to the present embodiment includes an image sensor; And first and second reflection members that respectively reflect light incident on the image sensor once, wherein the first and second reflection members are formed integrally with the reflection surface, and the reflection surface is curved And performs functions of at least one of auto focus, camera-shake correction, and zoom function.

The sum of the tilted angles of the first and second reflective members may be 0 degrees.

And a lens member that transmits light incident on the first and second reflection members.

In the infinite focus mode, the first reflection member is formed with the reflection surface flat, and the second reflection member can be formed with the reflection surface concave.

In the close-up mode, the first and second reflection members may be concave in both reflection surfaces.

In the zoom mode of less than one magnification, the first reflecting member may be concave and the second reflecting member may be convex.

In the 1x zoom mode, the first and second reflection members may all be formed with flat reflective surfaces.

In the zoom mode of more than 1 time, the first reflection member may be formed so that the reflection surface is convex, and the second reflection member may be formed concave in the reflection surface.

In the camera-shake correction mode, the first and second reflection members may be controlled to rotate together, or may be realized by only one of the first and second reflection members.

The first and second reflection members according to the first embodiment include a plurality of electrodes to which power is applied; And a reflecting surface formed of a mirror membrane deforming corresponding to a power source applied to the electrode.

At this time, the reflection surface formed by the mirror membrane may be formed to have a thickness of less than 0.5 mu m.

The first and second reflection members according to the second embodiment include a plurality of electrodes to which power is applied; A plurality of piezoelectric actuators provided corresponding to the electrodes and extending in the longitudinal direction; And a reflecting surface composed of a mirror plate which is deformed in shape in conjunction with longitudinal stretching of the piezoelectric actuator.

The first and second reflective members according to the third embodiment include a plurality of electrodes to which power is applied; A piezoelectric actuator connected to the electrode so as to be conductive and forming a layer having a predetermined thickness; A reflective surface that forms a curved surface corresponding to the deformation of the piezoelectric actuator; And a ground electrode interposed between the piezo actuator and the reflective surface.

At this time, the piezoelectric actuator, the reflection surface, and the ground electrode may be formed in a laminated manner to form a layer.

It is possible to correct the focal point and the shake of the light including the image input to the image sensor by using a pair of mirror members whose surface shape is changed by an electrical signal, And a high-performance camera module capable of image stabilization can be realized in a small size.

In addition, when a local blur phenomenon occurs due to a decrease in the uniformity of the image at the feature position, it is possible to maintain the uniform resolution in the image sensor by controlling the surface of the mirror member corresponding to the position to be protruded or concaved .

1 and 2 are views schematically showing an optical system of a camera module according to the present embodiment for performing an auto focusing function,
3 to 5 are views schematically showing an optical system of a camera module according to the present embodiment for performing a zoom function,
6 and 7 are views schematically showing an optical system of a camera module according to the present embodiment for performing an image stabilization function,
8 is a view showing a sample image in which a local blur phenomenon occurs,
9 is a view showing a state in which a surface of a mirror member at a corresponding position of an image sensor in which local blurring has occurred is deformed,
10 is a view schematically showing a mirror member according to the first embodiment,
11 is a view schematically showing a mirror member according to the second embodiment, and FIG.
12 is a view schematically showing a mirror member according to the third embodiment.

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

FIGS. 1 and 2 are views schematically showing an optical system of a camera module according to the present embodiment for performing an auto focusing function. FIGS. 3 to 5 show an optical system of the camera module according to the present embodiment for performing a zoom function. FIGS. 6 and 7 are views schematically showing an optical system of a camera module according to the present embodiment for performing an image stabilization function, and FIG. 8 is a view showing a sample image in which local blurring has occurred FIG. 9 is a view showing a state in which a surface of a mirror member at a corresponding position of an image sensor in which local blurring has occurred is deformed. FIG. 10 is a view schematically showing a mirror member according to the first embodiment, 11 schematically shows a mirror member according to the second embodiment, and Fig. 12 is a view schematically showing a mirror member according to the third embodiment.

1 to 7, the optical system of the camera module according to the present embodiment may include the image sensor 10 and the first and second reflection members 20 and 30, The lens member 40 may be provided.

The image sensor 10 receives light including the image transmitted through the optical path, and outputs the received light to an unshown control unit as an electrical signal.

According to the present embodiment, the first and second reflection members 20 and 30 may be disposed between the lens member 40 and the image sensor 10 so as to face each other. The first and second reflection members 20 can reflect light incident through the lens member 40 twice and transmit the reflection light to the image sensor 10.

This embodiment modifies the shape of the first and second reflecting members 20 and 30 to perform the auto focusing function as shown in Figs. 1 and 2, or to perform zooming as shown in Figs. 3 to 5 Function, or may perform the camera-shake correction function as shown in Figs. 6 and 7. Particularly, the first and second reflecting members 20 and 30 of the present embodiment are continuous type mirrors, and the reflective surfaces are integrally formed, so that no loss of reflected light occurs.

1 is a view showing a case where an optical system is formed with an infinite focus in the optical system according to the present embodiment.

In order to form an infinite focus, as shown in the figure, the first reflecting member 20 is configured to flatten the reflecting surface 20a (see FIGS. 10 to 12) so that the incident light can be reflected as it is, The member 30 can concave the reflective surface. The second reflection member 30 functions to image an image reflected by the first reflection member 20 at a focus position of the image sensor 10. [

2 is a view showing a case where an optical system capable of photographing in a close-up mode is formed in the optical system according to the present embodiment.

As shown in the figure, both the reflective surface of the first reflective member 20 and the reflective surface of the second reflective member 30, which reflect light passing through the lens member 40, are concave, As shown in FIG.

3 is a view showing a case where an optical system capable of performing a zoom function of 0.5 times is formed in the optical system according to the present embodiment.

As shown in the figure, the reflecting surface of the first reflecting member 20, which reflects light passing through the lens member 40, can be formed concavely, and the reflecting surface of the second reflecting member 30 is convex , And 0.5-fold zoom mode.

4 is a view showing a case where an optical system capable of performing a 1x zoom function is formed in the optical system according to the present embodiment.

The reflecting surface of the first reflecting member 20 and the reflecting surface of the second reflecting member 30 that reflect light passing through the lens member 40 may all be formed to be flat, The light passing through the lens member 40 can be transmitted to the image sensor 10 without being enlarged or reduced.

5 is a view showing a case where an optical system capable of performing a 2.0x zoom function is formed in the optical system according to the present embodiment.

As shown in the figure, the reflecting surface of the first reflecting member 20, which reflects light passing through the lens member 40, can be convexly formed, and the reflecting surface of the second reflecting member 30 is formed concave , It is possible to form an image in a 2.0x zoom mode.

Meanwhile, in order to operate in the zoom mode of 0.5 to 2.0 times, the surfaces of the first and second reflection members 20 and 30 may be deformed into a convex or concave shape as described above. Can be increased or decreased through an image image formed on the image sensor. If it is necessary to zoom more than 2.0 times or less than 0.5 times, it is possible to increase or decrease the deformation size of the first and second reflection members 20 and 30.

6 and 7 are views showing a case where an optical system capable of performing an image stabilization function is formed in the optical system according to the present embodiment.

6, the first reflection member 20 is tilted and controlled in the direction of the arrow A, so that the reflection of the image (X-tilt compensation) that controls the focus position by moving the optical axis of the light beam as shown by a dotted line.

7, the first reflection member 20 is fixed and the second reflection member 30 is tilted in the direction of the arrow B, so that the optical axis of the reflected light is shifted to the focus position of the image sensor 10 Y-tilt compensation can be performed.

Alternatively, although not shown, it is also possible to use only one of the first and second reflecting members 20 and 30 to reflect the light from the reflecting member 20 disposed on the light path of the first and second reflecting members 20 and 30 It is also possible to perform camera shake correction through tilting control.

10 to 12 are schematic views illustrating the first reflecting member 20 as an example for explaining the principle of deformation of the first and second reflecting members 20 and 30 according to the present embodiment. Although not shown, the second reflection member 30 may be formed in the same shape as the first reflection member 20. [

The first reflection member 20 according to the first embodiment may include a reflection surface 20a and a plurality of electrodes 20b that reflect incident light, as shown in FIG.

As shown in the figure, when a DC power source is applied to the electrode 20b, a power applied to the electrode 20b is applied to a mirror membrane forming a reflecting surface 20a according to electrostatic attraction, So that a curved line of the reflecting surface 20a required by the control unit can be formed.

At this time, the mirror membrane forming the reflection surface 20a is formed in the form of a thin film, and can move toward the electrode 20b by the electrostatic force to form a curved line of the reflection surface 20a. At this time, the electrode 20b can perform the operation of pulling the reflecting surface 20a when power is applied. The mirror membrane forming the reflective surface 20a may be formed by a silicon fabrication method, and the thickness of the mirror membrane may not exceed 0.5 占 퐉.

11, the first reflecting member 20 according to the second embodiment includes a reflecting surface 20a formed of a mirror plate that reflects incident light, a plurality of electrodes 20b, and a plurality of electrodes 20b And a piezoelectric actuator 20c that is formed to correspond to the piezoelectric actuator 20a and can be stretched in the longitudinal direction. At this time, the electrode 20b and the piezo actuator 20c are provided in a pair, and they can be extended in the longitudinal direction by constituting a laminated driving device formed by a plurality of the electrodes.

Accordingly, when power is applied to the electrode 20b, the piezo actuator 20c can be deformed by pushing the thin reflective surface 20a in conjunction with the power application. At this time, when the electrode 20b and the piezoelectric actuator 20c are dispersedly arranged over a certain area, the curve of the entire reflective surface 20a can be deformed.

12, the first reflecting member 20 according to the third embodiment has a reflecting surface 20a, an electrode 20b, a piezo actuator 20c, a reflecting surface 20a and a piezo actuator 20c, And a ground electrode 20d interposed between them.

Such a structure is a bimorph type. When a voltage is applied, the piezoelectric actuator 20c, which is provided in a layer shape, expands and induces a bending moment, so that the layered structure can be bent. Therefore, the reflective surface 20a, which forms a passive mirror layer, can be deformed in a shape corresponding to the piezo actuator 20c by applying a voltage to a portion of the piezo actuator 20c to induce local bending. can do.

The structure of the first reflection member 20 according to the first to third embodiments may be implemented in the same manner as the second reflection member 30, or a combination thereof.

The angle of the first and second reflecting members 20 and 30 is set to be +/- 45 degrees, and the incident light can be reflected by changing the angle of 90 degrees. However, the present invention is not limited thereto. The sum of the tilted angles of the first and second reflection members 20 and 30 may be appropriately varied so as to be zero degrees.

According to the present embodiment as described above, it is possible to realize the above-described functions even if the optical system is formed by constituting a plurality of lenses and the complex moving mechanism for implementing the auto focus, It is possible to provide a high-performance and compact camera module.

According to the above configuration, it is possible to easily configure a combination of at least two functions among the auto focusing function, the camera-shake correction function, and the zoom function with a very simple configuration.

In addition, since it can operate at a very low power, it is possible to provide a camera module which can be used in a low-power environment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the true scope of protection of the present embodiment should be defined by the following claims.

10; An image sensor 20; The first reflective member
20a; Reflective surface 20b; electrode
20c; Piezo actuator 20d; Ground electrode
30; A second reflective member 40; Lens member

Claims (14)

Image sensor; And
And first and second reflection members for respectively reflecting light incident on the image sensor once,
Wherein the first and second reflecting members are integrally formed with reflecting surfaces and are deformed to have curved surfaces according to power application, thereby performing at least one of auto focusing, camera shake correction, and zooming.
The method according to claim 1,
Wherein the sum of the tilted angles of the first and second reflection members is 0 degrees.
The method according to claim 1,
And a lens member that transmits light incident on the first and second reflection members.
The method according to claim 1,
In the infinity focus mode, the first reflection member is formed with the reflection surface flat, and the second reflection member is formed with the reflection surface concave.
The method according to claim 1,
In the macro mode, the first and second reflection members are formed such that both reflection surfaces are concave.
The method according to claim 1,
Wherein the first reflecting member is concave in the reflective surface and the second reflective member is convex in the zoom mode of less than one magnification.
The method according to claim 1,
In the 1x zoom mode, the first and second reflection members are all formed with flat reflective surfaces.
The method according to claim 1,
Wherein the first reflection member has a reflective surface formed in a convex shape and the second reflective member has a reflective surface formed concave in a zoom mode of more than 1 time.
The method according to claim 1,
And the first and second reflection members rotate together in the camera-shake correction mode.
The light emitting device according to claim 1, wherein the first and second reflecting members
A plurality of electrodes to which power is applied; And
And a reflecting surface formed of a mirror membrane deforming corresponding to a power source applied to the electrode.
11. The method of claim 10,
Wherein the reflecting surface formed of the mirror membrane has a thickness of less than 0.5 mu m.
The light emitting device according to claim 1, wherein the first and second reflecting members
A plurality of electrodes to which power is applied;
A plurality of piezoelectric actuators provided corresponding to the electrodes and extending in the longitudinal direction; And
And a mirror plate that is deformed in a shape interlocked with longitudinal extension of the piezoelectric actuator.
The light emitting device according to claim 1, wherein the first and second reflecting members
A plurality of electrodes to which power is applied;
A piezoelectric actuator connected to the electrode so as to be conductive and forming a layer having a predetermined thickness;
A reflective surface that forms a curved surface corresponding to the deformation of the piezoelectric actuator; And
And a ground electrode interposed between the piezo actuator and the reflective surface.
14. The method of claim 13,
Wherein the piezoelectric actuator, the reflection surface, and the ground electrode are laminated in a corresponding area to form a layer.

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