KR101204587B1 - Image photographing device having function for compensation hand vibration - Google Patents

Abstract

The present invention relates to an image pickup apparatus equipped with a camera shake correction function.
Image stabilization apparatus equipped with a camera shake correction function of the present invention is an optical unit; A magnet coupled to an outer circumferential surface of the optical unit; A housing in which the optical unit and the magnet are inserted and the coil is disposed at a position corresponding to the magnet; A hall sensor installed under the magnet in the housing to recognize a movement position of the magnet; A suspension wire disposed at four corners of the optical unit and having an upper end and a lower end coupled to the optical unit and the housing, respectively, for supporting the optical unit in a lifted state from a bottom of the housing; A flexible printed circuit board surrounding an outer circumferential surface of the housing and applying a current to the coil; And a substrate mounted on an upper surface thereof and coupled to a lower portion of the housing.

Description

Imaging device with image stabilization {IMAGE PHOTOGRAPHING DEVICE HAVING FUNCTION FOR COMPENSATION HAND VIBRATION}

The present invention relates to an image photographing apparatus having an image stabilization function. More particularly, the present invention relates to an image photographing apparatus having a image stabilization function in which a hall sensor for measuring a moving position of an optical unit is disposed below a magnet. .

In recent years, the adoption of ultra-compact camera modules for mobile devices has been gradually expanded to mobile devices such as mobile phones, laptops, and tablet PCs. Higher functions such as a zoom function and auto focus are required.

In general, a camera module employed in a mobile device includes an optical system including a lens, a lens driving unit for adjusting focus by moving the optical system in an optical axis direction, and an image sensor for capturing light flowing through the optical system and converting the light into an image signal. Can be.

The camera module configured as described above has a smaller pixel size as the high pixels and higher functions are implemented, and the sensitivity of the light captured by the image sensor becomes more sensitive as the number of components passing through the light becomes more sensitive. Since the focus of the image picked up by the image sensor is distorted even at the slightest shake when operating, there is a problem that the image quality is deteriorated and a clear picture cannot be obtained.

In order to prevent such deterioration of image quality due to camera shake, the light passing through the lens of the optical system is generated by distorting the optical axis of the lens, so that the lens is moved in a direction perpendicular to the optical axis to match the optical axis of the lens with the incident path of the light. In addition, the image sensor is moved in a direction perpendicular to the optical axis to match the incident path of the light received by the optical axis and the image sensor so that image stabilization is performed.

That is, image stabilization may be performed by applying a relative displacement to the lens or the image sensor in a direction perpendicular to the optical axis, respectively.

In this way, the camera shake correction is provided by applying a relative displacement of the lens or image sensor so that the lens is installed in a T-shape or L-shape to support the lens. As it is driven by the movement in the relative direction of the drive displacement generated by the hand shake is made of the hand shake correction.

At this time, the correction performance may be degraded by friction between the biaxial guide and the lens when the lens is moved along the biaxial guide, and the noise may be caused by friction between the biaxial guide and the lens or other components when the biaxial guide is driven. It is pointed out that the problem that foreign matter can occur.

In addition, since the two-axis guide is supported around the lens, the size of the camera module is inevitably increased as much as the space in which the two-axis guide is installed.

On the other hand, in order to reduce noise or foreign matter, a method in which the optical unit is supported through the suspension wire and is supported and driven in a direction perpendicular to the optical axis may be employed, and the optical unit is supported by the suspension wire. Is moved in the relative direction of the drive displacement generated by the hand shake by the electromagnetic force is to perform a hand shake correction.

In this manner, the image stabilization device has no operating noise as the friction between the optical unit and other components is not generated while the optical unit is being driven, and the deterioration of performance can be minimized due to no foreign matter caused by the friction. .

Accordingly, the present invention has been made in order to solve the above-mentioned disadvantages and problems raised in the conventional image pickup apparatus equipped with the image stabilization function, by placing one or more Hall sensors in the lower portion of the magnet of the optical unit with a magnet SUMMARY OF THE INVENTION An object of the present invention is to provide an image capturing apparatus equipped with a camera shake correction function such that the camera shake correction can be performed accurately as the movement position can be easily measured.

The object of the present invention, the optical unit; A magnet coupled to an outer circumferential surface of the optical unit; A housing in which the optical unit and the magnet are inserted and the coil is disposed at a position corresponding to the magnet; A hall sensor installed under the magnet in the housing to recognize a movement position of the magnet; A suspension wire disposed at four corners of the optical unit and having an upper end and a lower end coupled to the optical unit and the housing, respectively, for supporting the optical unit in a lifted state from a bottom of the housing; A flexible printed circuit board surrounding an outer circumferential surface of the housing and applying a current to the coil; And an image sensor mounted on an upper surface thereof and coupled to a lower portion of the housing, thereby providing an image photographing apparatus equipped with a camera shake correction function.

The optical unit includes a lens barrel in which a lens group is mounted, and the lens barrel is mounted in the bobbin so that the lens barrel can be driven up and down by a driving unit in the bobbin. The driving unit may be implemented by a method using a piezo, a method of generating an electromagnetic force using a coil and a magnet, and a method using a shape memory alloy.

In this case, the flexible printed circuit board is electrically connected to the substrate to transfer power applied through the substrate to a coil mounted in the housing.

In addition, the image pickup apparatus with a hand shake correction function of the present invention may further include a yoke coupled to the magnet mounted to the outside of the optical unit, the yoke is such that the magnetic force generated in the magnet is concentrated on the coil Play a role.

In addition, the image capturing apparatus equipped with the image stabilization function of the present invention may further include a shield case coupled to the outside of the housing, wherein the shield case protects an optical unit inserted therein, including the housing, and electromagnetic waves. To block.

The Hall sensor may be installed on the bottom surface of the housing at a position corresponding to the lower portion of the magnet, and in real time the position of the magnet driven together with the optical unit is transferred to a driving driver (drive IC) in the housing. You can track the relative drive amount for the optical unit.

At this time, the Hall sensor is a pair of individually disposed in the lower portion of the magnet disposed at a right angle among the magnets disposed on the four sides of the optical unit is a pair of Hall sensors are respectively in the X, Y axis direction of the optical unit The relative driving amount can be measured.

As described above, the image capturing apparatus equipped with the image stabilization function according to the present invention is a pair of the one or more magnets are arranged at a right angle and the real-time movement amount of the optical unit with a magnet is detected by the Hall sensor By arranging the Hall sensors, the effect of the drive control of the optical unit can be easily performed by allowing the X, Y-axis movements of the optical unit to be individually detected.

1 is an assembled perspective view of an image photographing apparatus equipped with a camera shake correction function according to the present invention.
2 is a cross-sectional view of an image photographing apparatus equipped with a camera shake correction function according to the present invention.
3 and 4 are layout views of the Hall sensor employed in the image pickup apparatus of the present invention,
3 is a perspective view of the arrangement of the magnet and the hall sensor,
4 is a bottom view of the arrangement of the magnet and the hall sensor.
Figure 5 is a block diagram showing the leading edge connection relationship of the Hall sensor employed in the image pickup apparatus according to the present invention.

Matters relating to the operational effects including the technical configuration of the above-described object of the image capturing apparatus equipped with the image stabilization function according to the present invention will be clearly understood by the following detailed description with reference to the drawings showing preferred embodiments of the present invention. .

First, FIG. 1 is an assembled perspective view of an image photographing apparatus equipped with a camera shake correction function according to the present invention, FIG. 2 is a cross-sectional view of an image photographing apparatus equipped with a camera shake correction function according to the present invention, FIGS. FIG. 3 is an arrangement perspective view of a magnet and a hall sensor, and FIG. 4 is an arrangement bottom view of the magnet and the hall sensor.

As shown in the drawing, the image photographing apparatus having the image stabilization function according to the present invention includes a substrate 110 on which the image sensor 111 is mounted, a housing 120 installed on the substrate 110, and the housing 120. The optical unit 130 and the magnet 140, which is inserted into the inside of the), the Hall sensor 122 mounted in the housing 120 of the lower side of the magnet 140, the optical unit 130 in the housing 120 Suspension wire 150 to support and a shield case 160 is covered on the upper portion of the housing 120.

In this case, the flexible printed circuit board 125 is coupled to the outside of the housing 120 and the flexible printed circuit board 125 is electrically connected to the substrate 110 mounted below the housing 120. Can be connected.

The substrate 110 may have an image sensor 111 mounted on a central portion of the upper surface thereof, and may be electrically connected through a connection means such as wire bonding or an adhesive, and may be formed of a printed circuit board or a ceramic substrate.

The housing 120 seated on the substrate 110 is assembled in parallel with the upper surface of the substrate 110 on which the image sensor 111 is mounted. The unit 130 and the magnet 140 may be mounted, and the image sensor 111 may be inserted through the opened bottom surface.

In addition, the housing 120 may be mounted to the coil 121 wound in one direction on four sides of the enclosure type, and the optical unit 130 may be mounted to the inner central portion so as to move horizontally. In this case, the magnet 140 may be inserted into the housing 120 at a predetermined interval to the outside of the optical unit 130, and the magnet 140 may be mounted on the slope of the housing 120. It may be disposed in a position corresponding to the.

The reason for arranging the coil 121 and the magnet 140 in a corresponding position is that the magnet 140 is generated by an electromagnetic field generated by an electric field generated by a current applied to the coil and a magnetic field generated by the magnet 140. In order to achieve a horizontal movement relative to the drive displacement of the optical unit 130 mounted inside.

In this case, the current applied to the coil 121 may be applied through the flexible printed circuit board 125 surrounding the outer circumferential surface of the housing 120.

Meanwhile, the optical unit 130 mounted in the housing 120 so as to be horizontally movable may be mounted in a state in which four corners are supported by the suspension wire 150 and supported in the housing 120. The suspension wire 150 serves to elastically support the optical unit 130 in the housing 120 and at the same time orthogonal to the optical axis of the optical unit 130, that is, in one direction or a plurality of the optical units 130. When driving displacement occurs in the direction of, by allowing the movement amount to be controlled in the X and Y-axis directions on the opposite side relative to the driving displacement, correction for hand shake can be made.

In this case, the suspension wire 150 may be electrically connected to the substrate 110 mounted below the housing 120 when the lower end is coupled to the bottom of the housing 120, and the upper end is coupled to the optical unit 130 to provide optical It may be configured to apply the driving power of the unit 130. In addition, the suspension wire 150 electrically connected to the substrate 110 may be electrically coupled to each other through soldering or conductive adhesive.

The optical unit 130 may include a bobbin 131, a lens barrel 132 mounted in the bobbin 131, and a driver (not shown) for vertically driving the lens barrel 132, and the suspension wire. Power is applied to the driving unit through the 150 to drive the lens barrel 132 mounted in the bobbin 131 up and down so that the auto focus is achieved by adjusting the gap with the image sensor 111 mounted on the substrate 110. can do.

In addition, the driving unit installed in the optical unit 130 is a VCM (Voice Coli Moter) method, which drives the lens barrel 132 up and down by the electromagnetic force generated between the coil and the magnet, the piezoelectric element (Piezo) A method of vertically driving the lens barrel by applying a current to the used ultrasonic motor method and the shape memory alloy may be used to vertically drive the lens barrel 132 in the optical axis direction in the bobbin 131.

The magnet 140 is coupled to the yoke 145 can be inserted into the housing 120, the yoke 145 is configured to surround the outer circumferential surface of the optical unit 130, the magnet (four sides) A protrusion to which the 140 can be easily attached may be formed, and the magnetic force is induced to the coil 121 by inducing a direction of generation of the magnetic force generated in the magnet 140 toward the coil 121 mounted to the housing 120. Be focused.
In this case, the magnet 140 may be installed to have a predetermined length on the outer circumferential surface of the optical unit 130, that is, in four directions, and the magnet 140 in the four directions is N and S poles in the length direction and the width direction, respectively. It may be polarized to be arranged in a position where the N pole and the S pole cross each other.

On the other hand, when the Hall sensor 122 is installed in the housing 120, as shown in Figure 3 and 4 may be installed at a predetermined interval with the magnet 140 on the lower side of the magnet 140, Preferably, it may be installed on the bottom surface of the housing 120 at a position corresponding to the bottom surface of the magnet 140.

The role of the hall sensor 122 is to determine the position of the magnet 140 mounted on the outer slope of the optical unit 130 in real time, and as a result, the magnet 140 is attached in the X, Y axis direction. To facilitate driving control of the optical unit 130 to be driven, as shown in FIG. 3, the magnet 140 is formed below the boundary between the N pole and the S pole of the magnet 140 formed of the N pole and the S pole from the magnet 140. The change in position of the magnet 140 may be measured in real time by recognizing the change in intensity of the generated magnetic field.

In more detail, the Hall sensor 122 installed below the magnet 140 recognizes the strength of the magnetic field generated from the magnet 140 to grasp the position of the magnet 140, and thus the optical unit 130. Is driven in the X and Y directions by the electromagnetic force generated between the magnet 140 and the coil 121, the relative movement is made to the Hall sensor 122 fixed to the bottom of the housing 120, the Hall sensor 122 The magnetic field strength of the magnet 140 sensed by () changes, thereby affecting the charge flowing through the hall sensor 122, thereby changing the position of the optical unit 130 as the signal generated by the hall sensor 122 is changed. Is measured in real time, the position of the optical unit 130 by the measured change signal can be transmitted to a drive driver (drive IC, not shown).

In addition, as shown in FIG. 4, the Hall sensor 122 fixed to the bottom surface of the lower housing 120 of the magnet 140 includes a plurality of magnets 140 disposed on four slopes of the optical unit 130. A pair may be disposed under the one or more magnets 140 disposed in the right angle direction.

That is, the hall sensors 122 respectively disposed under the magnet 140 positioned adjacent to the right angle direction may individually measure the position of the magnet 140 driven in the X or Y axis direction.

The reason why the pair of Hall sensors 122 are individually disposed below the magnet 140 disposed at right angles is that the optical unit 130 is complexly driven with the movement amount of the X-axis or the Y-axis when the shaking occurs. The X-axis or Y-axis movement amount is individually measured through a pair of Hall sensors 122 located under the magnet 140 disposed at right angles, so that one direction of the optical unit 130 is passed through one Hall sensor 122. Only the relative drive amount (X-axis or Y-axis) is measured to facilitate the drive amount calculation.
In addition, the Hall sensor 122 may be disposed in the central portion of the magnetic pole side of any one of the north pole and the south pole polarized in the longitudinal direction of the magnet 140. The arrangement of the Hall sensor 122 is in addition to one direction (X-axis or Y-axis) when the center of the Hall sensor 122 is disposed to be biased toward the magnetic pole side boundary or one side of the N pole and the S pole polarized in the longitudinal direction. Since there is a problem that an additional algorithm is applied because magnet movements in different directions can be detected at the same time, the center of the hall sensor is positioned at the magnetic pole center of either the north pole or the north pole polarized in the longitudinal direction as shown in FIG. Preferably disposed. In this case, only the relative driving amount of one direction (X-axis or Y-axis) of the hall sensor 122 can be accurately measured.

On the other hand, Figure 5 is a block diagram showing the connection of the leading edge of the Hall sensor employed in the image pickup apparatus according to the present invention, as shown in each side of the Hall sensor 122 employed in the image pickup device according to the present invention Four terminals may be provided in order to be electrically connected to the flexible printed circuit board 125 to which power is applied from the substrate 110, respectively.

A magnetic field recognized by the hall sensor 122 by applying a constant current or a constant voltage to the 1 and 3 terminals of the hall sensor 122 shown in FIG. 5 in a general manner and moving the magnet 140 located above the hall sensor 122. When the change is made, the current or voltage output through the 2 and 4 terminals is changed, and the moving amount of the magnet 140 is analyzed through the changed output current or output voltage to measure the driving amount of the optical unit 130 in real time. Can be.

In addition, the shield case 160 is coupled to the outside of the housing 120 in which the optical unit 130 and the magnet 140 are mounted to protect the components in the housing 120 and simultaneously block external electromagnetic waves to form a coil 121. ) And the magnet 140 may not be affected.

In the image photographing apparatus with the image stabilization function of the present invention, as shown in Figure 2, the present invention, when the optical unit 130 is inserted into the housing 120 is mounted on the lower substrate 110, The unit 130 maintains a predetermined distance from the bottom and inner walls of the housing 120 and is supported in a suspended state in the housing 120.

The optical unit 130 is supported by the suspension wire 150 having the lower end fixed to the bottom of the housing, and the housing 120 as the upper end of the suspension wire 150 supports the bobbin 131 constituting the optical unit 130. An elastic flow may be mounted in the horizontal direction through the suspension wire 150 in the inside).

At this time, the distance between the side of the optical unit 130 and the inner wall surface of the housing 120 may be typically formed in about 200㎛, the interval between the bottom surface of the optical unit 130 and the bottom surface of the housing 120 It may be formed at an interval of 50 to 100㎛.

In the image capturing apparatus of the present invention configured as described above, the optical unit 130 supported by the suspension wire 150 in the housing 120 is shaken by an external force that may be applied from the outside of the image capturing apparatus, such as a shutter driving or an impact. When the image photographing device is inclined to one side, the optical axis does not coincide with the light receiving surface of the image sensor due to the posture difference due to the self-weight of the optical unit 130, which may cause blurring of image quality. To solve this problem, the optical unit 130 is driven in the opposite direction in which the drive displacement is generated by the electromagnetic force generated between the coil 121 mounted on the housing 120 and the magnet 140 mounted on the optical unit 130. It is possible to ensure that the optical axis is always coincident with the light receiving surface of the image sensor. Therefore, even if a complex drive displacement occurs due to the shaking of the combined optical unit 130 in the X and Y axis directions, such as hand shaking, the optical unit in the relative direction of the drive displacement by the electromagnetic force between the coil 121 and the magnet 140. In this case, the driving of the optical unit 130 can be elastically controlled by the suspension wire 150.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and various substitutions, modifications, and changes within the scope without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It will be possible, but such substitutions, changes and the like should be regarded as belonging to the following claims.

110. Substrate 111. Image Sensor
120. Housing 121. Coil
122. Hall sensor 130. Optical unit
140. Magnet 145. York
150.Suspension Wire 160.Shield Case

Claims (8)

Optical unit;
A magnet coupled to an outer circumferential surface of the optical unit, the magnet being polarized to the N pole and the S pole in the longitudinal direction or the width direction, respectively, and disposed at a position where the N pole and the S pole cross each other;
A housing in which the optical unit and the magnet are inserted and the coil is disposed at a position corresponding to the magnet;
It is installed under the magnet in the housing to recognize the movement position of the magnet, is installed on the lower boundary line between the north pole and the south pole polarized in the width direction of the magnet, disposed on the slope of the optical unit The pair of magnets are located at the bottom of the plurality of magnets arranged in the right direction to detect the position movement of the magnets, respectively, but is disposed in the central portion of any one pole of the north pole and the north pole and polarized polarized in the longitudinal direction of the magnet Hall sensor;
A suspension wire disposed at four corners of the optical unit and having an upper end and a lower end coupled to the optical unit and the housing, respectively, for supporting the optical unit in a lifted state from a bottom of the housing;
A flexible printed circuit board surrounding an outer circumferential surface of the housing and applying a current to the coil; And
A substrate mounted on an upper surface thereof and coupled to a lower portion of the housing;
Image pickup device having a camera shake correction function comprising a.
The method of claim 1,
And the optical unit includes a bobbin, a lens barrel mounted in the bobbin, and a driving unit for vertically driving the lens barrel.
The method of claim 2,
The driving unit is automatically driven by vertically driving the lens barrel through an ultrasonic motor method using a piezo, a VCM (Voice Coil Motor) method using a coil and a magnet or a shape memory alloy. An imaging device equipped with a camera shake correction function to enable focusing.
The method of claim 1,
And the flexible printed circuit board has an image stabilization function electrically connected to the substrate to transfer power applied through the substrate to a coil mounted in the housing.
The method of claim 1,
And the image photographing apparatus further comprises a yoke to which the magnet mounted to the outside of the optical unit is coupled.
The method of claim 1,
The image photographing apparatus includes an image stabilization function further including a shield case coupled to the outside of the housing.
The method of claim 1,
The hall sensor is an image pickup device having a camera shake correction function to determine the position of the optical unit in real time to transmit to the drive driver.
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