KR20090084494A - Tilt driving apparatus for vibration correction in image photographing apparatus - Google Patents

Abstract

A tilt driving device for compensating the hand swaying of an image photographing device is provided to prevent the lowering of image quality which is caused by the hand swaying. An upper fixing unit(191) adheres a driving mirror for reflecting an image of a photographed subject to an upper portion. A yoke(193) installs a permanent magnet(192) on an upper surface which is divided into 4 equal areas. A coil(194) receives a control signal for tilting the driving mirror. By connecting the upper fixing unit to square edges of the yoke, a spring(195) elastically supports the tilted fixing unit by the electromagnetic action between the permanent magnet and coil.

Description

Tilt driving apparatus for vibration correction in image photographing apparatus

The present invention relates to a tilt drive device.

More specifically, when vibration occurs due to the shaking of the user when a predetermined subject is taken by the image capturing apparatus, the tilt of the image capturing apparatus to prevent image deterioration by tilting the mirror in a direction to cancel the vibration. It relates to a drive device.

Recently, with the rapid development of multimedia-related technology, the general public's demand for high-definition video, photos, etc. is increasing, and accordingly, the multi-million-pixel high-performance video recording device equipped with the auto focus function and the optical zoom function is gradually becoming common. .

In addition, the image capturing device manufacturer has added an image stabilization function to the image capturing device having such a high function as an additional function to improve the image quality degradation caused by the user's hand shake phenomenon. Accordingly, the image quality can be obtained even when camera shake occurs when a user shakes the image capturing device.

FIG. 1 is a view for schematically explaining a configuration of an image photographing apparatus equipped with a conventional image stabilization function as described above.

As shown, a conventional image photographing apparatus equipped with a camera shake correction function includes a lens group 3 for forming an image of a subject on a camera CPU 1, an image capturing device 2, and an image capturing device 2. The lens driving control unit 5 and the lens driving control unit 5 processing the signals detected by the shaking detection sensor 4 and the shaking detection sensor 4 to generate a control signal for image stabilization to be applied to the lens driving unit 6. Lens drivers 6 for driving hand shake correction by driving some of the lenses constituting the lens group 3 in a direction perpendicular to the optical axis of the image pickup device 2 according to the control signal for image stabilization of 5). It consists of a general mechanism, an optical member, etc. which are provided in the image photographing apparatus.

Referring to the operation of the image recording device configured as described above are as follows.

First, if the entire image recording apparatus is shaken by a hand shake of the user who is holding the image recording apparatus, the image recording apparatus is relatively moved with respect to the subject during shooting. This will occur.

The vibration detection sensor 4 generates a signal proportional to the amount of vibration of the image photographing apparatus and outputs the signal to the lens driving controller 5, and the lens driving controller 5 calculates the actual amount of shaking and then cancels the lens. It calculates the driving degree of and provides it to the lens driver (6).

Then, the lens driving unit 6 causes vertical driving of the lens group 3 according to the control signal for image stabilization input from the lens driving control unit 5 so that the image formed on the image pickup device 2 is fixed without shaking.

However, since the image stabilization function of the conventional image capturing apparatus as described above is a direct movement method of the lens, there is a problem inevitably accompanied by deterioration in image quality. In other words, since the lens is corrected by driving a specific lens in the lens group perpendicular to the optical axis and canceling the camera shake, part of the lens group may deviate from the optical axis. Degradation of the image quality occurs compared to the optical system optimum image quality.

In addition, the conventional image photographing apparatus equipped with the image stabilization function has a problem that it is difficult to make the image photographing apparatus small because the lens driver is installed in the outer portion of the lens group.

An object of the present invention is to prevent the degradation of the image quality by tilting the mirror in the direction to cancel the vibration when the vibration caused by the user's hand when the user shoots a predetermined subject with the image photographing device to solve the above problems The present invention provides a tilt driving device for camera shake correction.

Another object of the present invention is to provide a tilt driving apparatus for image stabilization of an image photographing apparatus capable of performing image stabilization by two-axis tilt driving a mirror located in a light traveling direction from a subject.

It is still another object of the present invention to provide a tilt drive for image stabilization of an image photographing apparatus for tilt driving using an electromagnetic force using a magnet and a coil when driving a mirror in a direction of light travel from a subject. To provide a device.

A tilt driving device for image stabilization of the image photographing apparatus of the present invention for achieving the above object comprises: an upper fixing portion having a movable mirror attached to the upper portion to reflect an image of a subject to be photographed; A permanent magnet formed in a flat shape and magnetized in a vertical direction with a flat surface, and having an N pole, a magnetization polarization line, and an S pole sequentially formed from top to bottom; Permanent magnets are installed on each of the four equally divided upper surface, the lower surface is fixed to the housing in the image pickup device and yoke to efficiently operate the direction of the magnetic force; It is wound to have the same shape as the magnetization area of the permanent magnet on the lower surface of the upper fixing part, which is a position corresponding to the magnetization area affecting the force generation of the four permanent magnets provided on the upper surface of the yoke, and tilting the movable mirror. A coil into which a control signal is inputted; And a spring connecting the upper fixing part and the square of the yoke so as to elastically support the upper fixing part so that the position is not released when the upper fixing part is tilted by the electromagnetic action of the permanent magnet and the coil.

The yoke described above is formed with grooves identical to the shape of the permanent magnets on each of the four equally divided upper surfaces, and a permanent magnet is inserted into the grooves so that the upper surface of the permanent magnets is in line with the upper surface of the yoke. It is desirable to.

In addition, it is preferable that the above-described yoke is fixed by placing a permanent magnet on each of the four equally divided upper surfaces.

The coil described above uses two coils to connect each of the surfaces facing each other in a diagonal direction, forms a voltage terminal at an end thereof, and alternately provides a control signal for tilting the movable mirror by each voltage terminal. It is preferable to receive an input.

When the coils are wound in diagonal directions facing each other, the coils are wound in one clockwise direction and the other in a counterclockwise direction so that the generated forces are opposite to each other so that two-axis tilt driving is performed. desirable.

As described above, according to the tilt driving apparatus for image stabilization of the image capturing apparatus of the present invention, when a hand shake of a user photographing a predetermined subject occurs with the image capturing apparatus, the lens is not directly moved as in the prior art. By performing two-axis tilt driving of the movable mirror located in the light traveling direction from the subject by electromagnetic force, image stabilization is reduced by the camera shake.

Hereinafter, with reference to the accompanying drawings will be described in detail a tilt driving device for the camera shake correction of the present invention.

2 is a view schematically showing the configuration of an embodiment of an image photographing apparatus to which the tilt driving device for image stabilization according to the present invention is applied.

As illustrated, the image photographing apparatus to which the tilt driving apparatus of the present invention is applied includes a printed circuit board 110, an imaging device 120, a lens barrel 130, a lens barrel mechanism 140, and a movable mirror 150. ), A detection light splitting mirror 160, a shake detection sensor 170, a tilt control unit 180, a tilt driving unit 190, and the like.

The imaging device 120 is installed on a substrate 110 composed of various circuit elements for controlling driving of an image photographing apparatus. The imaging device 120 captures an image of a subject to be captured according to a user's operation and converts the image into a predetermined image signal. Output

The lens barrel 130 includes one or more lenses for forming an image of a subject in the image pickup device.

In this case, one or more lens barrels 130 may be selectively used according to the design of the lens. When divided into three as shown in FIG. 2, the first lens barrel 130a is the front of the movable mirror 150 and the second lens barrel. Reference numeral 130b may be provided between the movable mirror 150 and the detection light branch mirror 160, and the third lens barrel 130c may be installed between the detection light branch mirror 160 and the imaging device 120, respectively.

The lens barrel mechanism 140 is a part that performs an auto focus function, a zoom function, and the like of the image photographing apparatus.

In this case, the lens barrel mechanism 140 has been described as an example provided in the first lens barrel 130a in front of the movable mirror 150 in the drawings, but is not limited thereto. In addition, the second lens barrel 130b, The lens can be selectively positioned on the lens barrel 130c.

The movable mirror 150 reflects the image of the subject to be photographed and outputs the light toward the detection light branch mirror 160.

The detection light splitting mirror 160 has an optical coating surface for splitting the incident light so that the reflected light and the transmitted light have predetermined characteristics, and is formed in the direction of light travel from the subject, and the image pickup device captures most of the visible light reflected by the movable mirror 150. Reflecting in the direction (120), and some visible light including the infrared region reflected from the movable mirror 150 is output to the shake detection sensor 170 of the back.

The shake detection sensor 170 is installed at the rear of the detection light branch mirror 160, and after detecting the image of the subject branched by the detection light branch mirror 160, the image of the detected subject is transferred to the tilt control unit 180. Output

The tilt controller 180 detects a motion according to a user's hand movement based on a detection signal input from the shake detection sensor 170, and provides a control signal for tilting the movable mirror 150 in a direction in which vibration caused by the hand shake is canceled. It generates and outputs to the tilt driver 190.

The tilt driver 190 is installed at the rear side of the movable mirror 150, and tilts the movable mirror 150 in a direction in which vibration caused by hand shake is canceled in accordance with a control signal input from the tilt controller 180. The image formed on 120 is fixed.

Meanwhile, the image photographing apparatus to which the tilt driving apparatus of the present invention is applied may be configured as shown in FIG. 3 in addition to the configuration of FIG. 2 described above.

That is, compared with the configuration of FIG. 2, only the configuration of the detection light splitting mirror 160a, the shake detection sensor 170a, and the tilt control unit 180a, which are components of the hand shake detection, is different. It is configured. Here, only the differences between the components will be described, and other components will be omitted.

The detection light splitting mirror 160a is optically coated on the light traveling direction surface from the subject to reflect and branch most of the visible light reflected from the movable mirror 150 in the direction of the image pickup device 120, and the movable mirror 150. The infrared region reflected from the branch is rearward to prevent the infrared component from entering the imaging device 120.

The vibration detection sensor 170a is installed in the image photographing apparatus using an acceleration sensor or a gyro sensor, and detects a motion state such as acceleration and vibration of the image photographing apparatus itself according to a user's operation, and detects a detection signal by the tilt control unit 180a. )

The tilt control unit 180a detects a motion according to the user's hand movement based on the motion state information of the image photographing device itself detected by the shake detection sensor 170a, and tilts the movable mirror in a direction in which vibration caused by the hand shake is canceled. The control signal is generated, and the control signal is output to the tilt driver 190 to tilt the movable mirror 150 in a direction in which the vibration caused by the hand shake is canceled in the tilt driver 190 so that the image formed on the imaging device 120 is fixed. Be sure to

4 and 5 are an exploded perspective view and a combined perspective view of the tilt driver 190 of FIG. 2, respectively.

As illustrated, the tilt driver 190 includes an upper fixing part 191, a permanent magnet 192, a yoke 193, a coil 194, a spring 195, and the like.

The upper fixing part 191 is movable mirror 150 is attached to the upper surface, the coil 194 is attached to the lower surface.

The permanent magnet 192 is formed in a flat plate shape and magnetized in a vertical direction with a flat surface. N poles, magnetization polarization lines, and S poles are sequentially formed from top to bottom.

The yoke 193 is provided with permanent magnets 192 on each of the four equally divided upper surfaces to increase the magnetic efficiency of the permanent magnets 192. The lower surface is fixed to a housing in the image photographing apparatus to efficiently operate the direction of magnetic force. Make.

The coil 194 is formed on the lower surface of the upper fixing part 191 at a position corresponding to the magnetization region that affects the force generation of the four permanent magnets 193 provided on the yoke 193. It is wound to have the same shape as the magnetization region, and a control signal (ie, V + and V- voltages) for tilting the movable mirror 150 is input from the tilt controller 180 through each voltage terminal 196 at the end thereof. do.

At this time, the coil facing in the diagonal direction is connected to one coil to form one voltage terminal, a total of two voltage terminals (for example, X terminal, Y terminal) is formed.

In addition, while winding the coil 194 in a diagonal direction facing each other, the winding so that the generated force is in the opposite direction to each other. That is, if one coil is wound in the clockwise direction, the diagonal coil is wound in the counterclockwise direction, and thus the permanent magnet 192 and the coil 194 are used in accordance with the control signal input from the tilt controller 180. The movable mirror 150 is biaxially tilted by the electromagnetic force.

The spring 195 connects the upper fixing part 191 and the yoke 193, and according to the control of the tilt controller 180, the upper fixing part 191 by the electromagnetic action of the permanent magnet 192 and the coil 194. Is elastically supported so that the position does not deviate when is tilted.

6 is a cross-sectional view illustrating the structure of the yoke 193 of FIG. 4, and FIG. 6A shows a groove in the form of a permanent magnet 192 on the upper portion of the yoke 193, and the groove of the permanent magnet 192 in the groove. The upper surface of the permanent magnet 192 is inserted into the upper surface of the yoke 193 and inserted into a structure, and FIG. 6B illustrates a structure in which the permanent magnet 192 is placed and fixed on top of the yoke 193. It is shown.

At this time, the structure of Figure 6a so that the upper surface of the permanent magnet 192 coincides with the upper surface of the yoke 193, compared to the structure of Figure 6b in which the permanent magnet 192 is mounted on the upper portion of the yoke 193 as it is. 192) efficiency can be maximized.

Next, an operation process of the tilt driver for image stabilization of the image photographing apparatus of the present invention configured as described above will be described with reference to FIGS. 7 to 10.

FIG. 7 is a diagram illustrating a relative movement of a subject caused by hand shaking in the process of using the image capturing apparatus of FIG. 2, and FIG. 8 is a diagram illustrating a hand shake correction by tilting the movable mirror of FIG. 2. 9 is a view for explaining the force generation principle of the tilt driver of FIG. 2, and FIG. 10 is a view for explaining the actual force generation driving example of the tilt driver of FIG.

First, when a user who uses an image photographing apparatus performs normal photographing, an image of a subject is reflected by the movable mirror 150 and outputted toward the detection light branch mirror 160, and the detection light branch mirror 160 includes the movable mirror ( The image of the subject reflected by 150 is reflected in the direction of the image pickup device 120, and the image pickup device 120 captures the image of the image of the subject to be photographed according to a user's manipulation and converts the image of the subject into a predetermined image signal.

When the user's hand shake occurs in the photographing process, the subject moves relatively, as shown in FIG. 7, and the position of the subject formed on the imaging device 120 is changed to deteriorate the photographing quality. At the same time, the image shift of the subject detected by the shake detection sensor 170 is also the same as that of the image formed on the image pickup device 120.

As described above, the image change of the subject due to the shaking of the user is detected by the shake detection sensor 170 installed at the rear of the detection light branch mirror 160, and the tilt control unit 180 is based on the image detected by the shake detection sensor 170. The degree of shaking is detected, and a control signal for tilting the movable mirror 150 in the direction of canceling the detected hand shake is generated and output to the tilt driver 190.

The degree of shaking performed by the tilt control unit 180 is a motion detection technique that can be generally implemented by those skilled in the security and object recognition field, and various methods are known, and the present invention uses any one of the methods. To implement it.

The tilt driver 190 installed on the rear surface of the movable mirror 150 lowers the inclination of the movable mirror 150 in a direction in which vibration caused by hand shake is canceled as shown in FIG. 8 according to a control signal input from the tilt controller 180. The camera shake correction is performed by performing a tilt operation.

However, when the direction of the hand shake is generated in a direction opposite to that shown in FIG. 8, the tilt driver 190 corrects the hand shake by outputting a control signal for increasing the tilt of the movable mirror 150 to the tilt controller 180. .

As described above, the tilt operation for the camera shake correction performed by the tilt driver 190 operates according to the principle shown in FIG. 9.

That is, as shown in FIG. 9, the magnetic force line has a direction perpendicular to the surface of the permanent magnet 192 at the upper surface of the permanent magnet 192, but is bent downward at the end of the permanent magnet 192. A line of magnetic force parallel to the surface of the permanent magnet 192 and directed outward (ie, a magnetic component that affects the generation of force) is caused to interact electromagnetically with the current flowing through the coil 194, thereby providing an effect of the current applied to the coil 194. According to the direction is a force is generated in a direction perpendicular to the permanent magnet 192 plane.

At this time, the upper fixing part 191 and the yoke 193 is because the rectangular portion is elastically supported by the spring 195, the upper fixing part 191 is tilted by the electromagnetic action of the permanent magnet 192 and the coil 194. When the position is not released, and the electromagnetic action disappears, it is returned to its normal state by the elastic force of the spring 195.

For example, as shown in FIG. 10A, the tilt controller 180 compensates for the positive voltage V + (that is, vibration caused by the camera shake) to the X terminal or the Y terminal of the tilt driver 190 for the camera shake correction. When a control signal for tilting the movable mirror 150 is applied, an electric current flows along the coil 194 and interacts with a magnetic field line of the permanent magnet 192 to the surface of the coil 194 by a known left-hand law of Fleming. Force is generated in the vertical direction.

At this time, since the two coils 194 facing each other in a diagonal direction are wound so that the direction of the generated force is opposite to each other, the upper fixing part 191 having the movable mirror 150 is tilted ( The left side is driven downwards, the right side is driven upwards), and thus the camera shake is corrected to prevent deterioration of image quality.

In addition, in order to compensate for hand shake in the opposite direction, as shown in FIG. 10B, when the tilt control unit 180 applies a negative voltage V- to the X terminal or the Y terminal of the tilt driver 190 to correct the hand shake. Due to the electromagnetic action of the permanent magnet 192 and the coil 194, the upper fixing part 191 provided with the movable mirror 150 in a direction opposite to that of FIG. 10A is tilted (left is driven upward, and right is downward). Drive) to thereby correct the user's hand shake to prevent deterioration of image quality.

Meanwhile, unlike the description of the operation process of the configuration of FIG. 2 described above, the operation process of the configuration of FIG. 3 having a difference in the hand shake detection method will be described below.

When a user who uses an image photographing apparatus performs normal photographing, an image of a subject is reflected by the movable mirror 150 to be output toward the detection light branch mirror 160a, and the detection light branch mirror 160a by the movable mirror 150. Reflects the image of the subject reflected in the direction of the image pickup device 120, the image capturing device 120 captures the image of the subject to be captured in accordance with the user's operation to convert into a predetermined image signal.

When the user's hand shake occurs in the photographing process, the position of the image formed on the image pickup device 120 is changed to reduce the image quality.

The image change of the subject due to the shaking of the user is detected through the vibration detection sensor 170a which is an acceleration sensor or a gyro sensor, and is based on the motion state information of the image photographing device itself detected by the vibration detection sensor 170a. The controller 180a detects a motion according to the shaking of the user, and generates a control signal for tilting the movable mirror 150 in a direction to cancel the detected shaking, and outputs it to the tilt driver 190.

Then, the tilt driver 190 installed on the rear surface of the movable mirror 150 tilts the tilt of the movable mirror 150 in order to cancel or increase the inclination of the movable mirror 150 in a direction in which vibration caused by hand shake is canceled in accordance with a control signal input from the tilt control 180a. The camera shake correction is performed by performing an operation (the operation process of the tilt driver 190 is the same as the operation process of the configuration of FIG. 2 described above).

Herein, while the present invention has been described with reference to the preferred embodiments, those skilled in the art will variously modify the present invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be changed.

1 is a view for schematically explaining the configuration of a conventional image pickup device for image stabilization;

FIG. 2 is a view schematically showing the configuration of an embodiment of an image photographing apparatus to which a tilt driving device for image stabilization according to the present invention is applied; FIG.

3 is a view schematically showing the configuration of another embodiment of an image photographing apparatus to which the tilt driving device for image stabilization according to the present invention is applied;

4 is an exploded perspective view of the tilt driver of FIG. 2;

5 is a perspective view of the tilt driving unit of FIG.

6 is a cross-sectional view for explaining the structure of the yoke of FIG. 4;

FIG. 7 is a view for explaining a relative movement of a subject caused by hand shaking in the process of using the image photographing apparatus of FIG. 2; FIG.

8 is a view for explaining the correction of hand shake by tilting the movable mirror of FIG.

9 is a view for explaining the force generation principle of the tilt driver of FIG.

FIG. 10 is a diagram for describing an actual force generation driving example of the tilt driver of FIG. 2.

Explanation of symbols on the main parts of the drawings

110 substrate 120 imaging device

130: lens barrel 140: lens barrel mechanism

150: movable mirror 160, 160a: detection light branch mirror

170, 170a: Shake detection sensor 180, 180a: Tilt control unit

190: tilt driving unit 191: upper fixing unit

192: permanent magnet 193: yoke

194: Coil 195: Spring

Claims (5)

An upper fixing part to which a movable mirror for reflecting an image of a subject to be photographed is attached; A permanent magnet formed in a flat shape and magnetized in a vertical direction with a flat surface, and having an N pole, a magnetization polarization line, and an S pole sequentially formed from top to bottom; The permanent magnet is installed on each of the four equally divided upper surface, the lower surface is fixed to the housing in the image pickup device yoke to efficiently operate the direction of the magnetic force; The movable mirror is wound on the lower surface of the upper fixing part, which is a position corresponding to the magnetization area affecting the force generation of the four permanent magnets provided on the upper surface of the yoke, to have the same shape as the magnetization area of the permanent magnet, and a movable mirror. A coil to which a control signal for tilting is input; And And a spring connecting the upper fixing part and the square of the yoke to elastically support the upper fixing part so that the upper fixing part is not separated when the upper fixing part is tilted by the electromagnetic action of the permanent magnet and the coil. Tilt drive for camera shake correction. The method of claim 1, wherein the yoke, On each of the four equally divided upper surface is formed the same groove as the shape of the permanent magnet, the permanent magnet is inserted into the groove so that the upper surface of the permanent magnet is in line with the upper surface of the yoke Tilt driving device for image stabilization of the image recording device. The method of claim 1, wherein the yoke, Tilt driving device for image stabilization of the image recording device, characterized in that the permanent magnet is placed on each of the four equally divided upper surface and fixed. The method of claim 1, wherein the coil, Using two coils to connect each of the faces facing each other in a diagonal direction, forming a voltage terminal at the end, and receives a control signal for tilting the movable mirror alternately with each voltage terminal Tilt drive for image stabilization. According to claim 4, When winding the coils in opposite directions facing each other, one side of the winding in the clockwise direction and the other side is wound in the counterclockwise direction so that the generated forces are opposite to each other to achieve a two-axis tilt drive Tilt driving device for image stabilization of the image recording device, characterized in that.

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