KR100867530B1 - Auto focusing camera module - Google Patents

Abstract

Provides an auto focusing camera module.

The present invention provides a lens barrel comprising at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. An actuator providing a driving force; The upper plate and the lower plate are made of a silicon material, and the lower surface of the upper plate and the upper surface of the lower plate corresponding to each other are doped with an electrolytic material having positive (+) polarity or negative (-) polarity when voltage is applied thereto. It is characterized by.

According to the present invention, the focusing adjustment for moving the lens barrel in the optical axis direction is easy, and the module size can be reduced to reduce the size of the product.

Auto Focusing, Camera Module, Lens Barrel, Image Sensor, Electric Field, Actuator

Description

AUTO FOCUSING CAMERA MODULE}

1 is an assembled perspective view of a conventional autofocusing camera module.

2 is a cross-sectional view showing a conventional auto focusing camera module.

3 is an exploded perspective view showing an auto focusing camera module according to the present invention.

4 is a cross-sectional view showing an auto focusing camera module according to the present invention.

5 is a cross-sectional view showing another embodiment of an auto focusing camera module according to the present invention.

Explanation of symbols on the main parts of the drawings

110: lens barrel 112: lens

120: housing 130: image sensor

140: substrate 150: actuator

151: top plate 152: bottom plate

151a, 152a: support portion 153,154: uneven surface

155,156 through-hole 159: elastic member

The present invention relates to a camera module that can be freely adjusted focus, and more particularly, to an auto focusing camera module that can easily adjust focusing to move a lens barrel in an optical axis direction and to reduce a module size.

Recently, with the introduction of mega pixel cameras on most mobile communication terminals, the rapid growth of the camera-mounted mobile phone market and the demand for higher resolution and higher resolution of video including still images The demand is increasing.

Accordingly, in addition to the basic shooting functions of the camera mounted on the mobile phone, a multifunctional mobile phone capable of implementing a combination of an auto focusing function, a macro and an optical zoom function has been developed, and the camera module has been gradually miniaturized. It was rather difficult to develop a product that can satisfy various needs of consumers by making a mobile phone equipped with a focusing device assembled by a lens driving method.

In the conventional focusing apparatus, by using a plurality of longitudinal reduction gears in the DC motor, the volume is increased and the driving noise of the motor is generated. When the DC motor is used, the start time and the stop time are long, making it difficult to control the position. Therefore, the problem that the vertical transfer efficiency of the lens assembly is significantly reduced has been pointed out.

In addition, the method using a piezoelectric actuator requires a high voltage of several tens of volts and a high frequency power of several tens of kilowatts, which complicates the driving circuit and is driven by the power transmission friction driving, which provides only less than 20% efficiency. There are disadvantages.

In order to solve such a problem, an actuator commonly referred to as VCA (Voice Coil Actuator) has been mainly used, and the lens barrel is driven up and down by an electromagnetic field generated between the coil and the permanent magnet included in the VCA. A brief technical configuration of a conventional VCM-type autofocus camera module is as follows.

1 is an assembled perspective view showing a conventional autofocusing camera module, Figure 2 is a cross-sectional view showing a conventional auto focusing camera module, as shown, the conventional camera module 1, the casing (2) of the subject An image capturing unit 3 for capturing an image, a lens group 4 composed of a plurality of lenses 5 for projecting an image of a subject to the image capturing unit 3, and the lens group ( 4) The lens barrel 6 for aligning each lens forming the optical axis direction, and the function to drive the lens barrel 6 in the optical axis direction to change the magnification formed by the lens group (4) and the image pickup unit As a control unit for controlling the drive unit 7 for performing a function to sharpen the image to be cleared, the initial position fixing unit for fixing the lens barrel 6 to the initial position with a predetermined braking force and the drive unit 7 Is done.

The image capturing unit 3 includes an image sensor 3a for converting an optical signal of a subject through the lens group 4 into an electrical signal, a protective glass protecting the image sensor 3a, and the image sensor ( 3a) is comprised of the board | substrate 8 mounted electrically via the wire 3b.

The red barrel 6 is equipped with an infrared cut filter for blocking the infrared rays passing through the lens group (4).

In addition, the driving unit 7 is wound around the lens barrel 6 and fixed to the coil 9 and the casing 2 to which a current is applied from the outside, and a magnetic flux passes through a horizontal portion of the coil 9. It consists of a permanent magnet 10 is polarized so that.

A yoke 11 is installed between the permanent magnet 10 and the lens barrel 6 to circulate magnetic flux of the permanent magnet 10.

In addition, a driving circuit C and a plurality of passive elements R, etc. are mounted on the upper surface of the printed circuit board 8, and the coil 9 of the driving unit 7 is a high current. It is controlled by a driving circuit that generates.

On the other hand, the lens barrel (6) inserted into the casing (2) is provided with a screw portion (6a) on the outer peripheral surface is inserted into the casing (2) and coupled by the rotation of the lens barrel (6) and at the same time the lens barrel (6) The focus adjustment for the lens group 4 in the barrel 6 is made by adjusting the height of the?

Such a conventional auto focus camera module is configured in a magnetic field method including a coil 9 and a permanent magnet 10 for driving the lens barrel 6 up and down, so that the coil 9 and It is pointed out that the technical configuration for forming the electromagnetic force between the permanent magnet 10 is not only complicated but also difficult to control the strength of the electromagnetic force generated between the coil 9 and the permanent magnet 10.

In addition, since a high current voltage is inevitably applied to the driving circuit in which the bulb 7 for generating electromagnetic force between the coil 9 and the permanent magnet 10 is controlled, an image mounted at a position adjacent to the driving circuit. There is a disadvantage that the effect of the electromagnetic waves due to the high current is emitted to the sensor (3a).

Therefore, the present invention has been made to solve the above-mentioned conventional problems, the purpose of which is to easily adjust the focusing to move the lens barrel in the optical axis direction, and to reduce the module size to reduce the size of the auto To provide a focusing camera module.

In order to achieve the above object, the present invention, a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. An actuator providing a driving force; The upper plate and the lower plate are made of a silicon material, and the lower surface of the upper plate and the upper surface of the lower plate corresponding to each other are doped with an electrolytic material having positive (+) polarity or negative (-) polarity when voltage is applied thereto. An auto focusing camera module is provided.

In addition, the present invention includes a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. An actuator providing a driving force; It includes, the top plate and the bottom plate provides an auto focusing camera module characterized in that the surface corresponding to each other having an uneven surface.

Preferably, the uneven surface is provided in a triangular or square-shaped cross section.

In addition, the present invention includes a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. An actuator providing a driving force; It includes, and between the upper plate and the lower plate provides an auto focusing camera module characterized in that it comprises a plurality of elastic members for supporting the upper plate to the upper portion elastically.

Preferably, the elastic member is directly supported from one side end of the upper plate and the opposite side edge facing the lower portion and a length extending directly below, from one side end of the lower plate and the opposite side edge facing the support plate of the upper plate. It is provided between the support portion extending a certain length to the top.

Preferably, the upper plate or the lower plate includes a driving circuit for applying (+) pole and (-) to the upper plate and the lower plate, respectively.

Preferably, the upper or lower plate includes an ISP for processing an image signal formed by the image sensor.

Preferably, the upper or lower plate includes a passive element such as a capacitor and a resistor.

In addition, the present invention includes a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. And an actuator providing a driving force, wherein a flexible board is further included between the upper plate and the lower plate, and an upper end of the flexible board is connected to a terminal portion formed on one side of the upper plate, and a lower end of the flexible board is It provides an auto focusing camera module characterized in that it is connected to the terminal portion formed on one side.

In addition, the present invention includes a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. And an actuator providing a driving force, wherein the upper plate and the lower plate each have a light receiving through-hole in a central area.

In addition, the present invention includes a lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And an upper plate fixed to the lower end of the lens barrel and a lower plate disposed at a predetermined interval to apply voltage to the upper and lower plates, respectively, to transfer the lens barrel in the optical axis direction by adjusting the gap between the upper and lower plates. And an actuator providing a driving force, wherein the lower plate is electrically connected to an upper surface of the substrate.

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Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view showing an auto focusing camera module according to the present invention, Figure 4 is a cross-sectional view showing an auto focusing camera module according to the present invention.

As shown in FIG. 3, the camera module package 100 of the present invention includes a lens barrel 110, a housing 120, an image sensor 130, a substrate 140, and an actuator 150.

The lens barrel 110 accommodates at least one lens 112 and is a hollow lens-shaped lens accommodating part through which an incident hole 114 of a predetermined size through which light is incident is formed in the central region of the upper surface.

The lens 112 in the lens barrel 110 maintains a gap between the adjacent lens and the spacer 116 and press-fits to fix the position of the lens 112 at the lower end of the lens barrel 110. Ring 118.

The housing 120 is a barrel receiving member in which the lens barrel 110 is assembled to be reciprocated upward in the optical axis direction. The body contacting the outer surface of the lens barrel 110 is provided in a hollow cylinder shape, and the substrate The body in contact with 140 is provided in a square.

The housing 120 may include an infrared cut filter to block infrared rays included in light incident to the image sensor 130 through the lens 112.

The image sensor 130 is an image pickup device that is disposed directly below the housing 120 and has an image imaging area formed on an upper surface thereof to form an object passing through a lens.

As shown in FIG. 4, the image sensor 130 may be wire-bonded through a plurality of wire members 135 having one end bonded to a terminal formed on the upper surface of the substrate 140.

In addition, as illustrated in FIG. 5, the image sensor 130a may be flip chip bonded through a bump ball 145 having a terminal formed on a lower surface of the substrate 140.

In this case, a window portion 141 having a predetermined size is formed through the substrate 140 corresponding to the image imaging region of the image sensor 130.

One end of the substrate 140 coupled to the lower end of the housing 120 electrically mounts the image sensor 130, and the other end includes a connector not shown to be electrically connected to the main board.

The actuator 150 is configured to include an upper plate 151 integrally fixed to the lower end of the lens barrel 110, and a lower plate 152 disposed at regular intervals from the upper plate 151 to the lower portion.

The actuator 150 applies a voltage to the upper plate and the lower plate, respectively, to widen or narrow the upper and lower intervals between the upper plate 151 and the lower plate 152 so as to be movable in the housing 120. The focusing operation of varying the focal length between the lens 112 and the image sensor 130 in the lens barrel 110 is performed by moving the 110 in the optical axis direction.

The upper plate 151 is provided with a support portion 151a extending a predetermined length to one side end and the opposite side edge border opposite thereto, and the lower plate 152 similarly corresponds to the support portion 151a of the upper plate 151. It has a support portion 152a extending a predetermined length to the upper portion on one side end and the opposite side edge border thereof, and a plurality of elastic members 159 elastically supporting the upper plate to the upper portion between the support portions 151a and 152a. ).

Here, the elastic member 159 may be provided with a compressed metal spring or made of a synthetic resin material having elasticity.

In addition, the upper plate 151 and the lower plate 152 is made of a silicon material, the lower surface of the upper plate 151 and the upper surface of the lower plate 152 corresponding to each other (+) polarity or (- Each of the electrolytic materials having polarity is doped.

The upper plate 151 and the lower plate 152 facing each other are preferably provided with uneven surfaces 153 and 154 so that the electric field generated when the voltage is applied to each other more smoothly to increase the amount of charge movement. The uneven surfaces 153 and 154 are provided on a triangular toothed cross section or a rectangular toothed cross section.

That is, when different voltages are applied to the upper plate 151 and the lower plate 152, the electric field is increased at each corner of the uneven surface of the uneven surface 153 and 154, and the uneven surface 153 Reference numeral 154 denotes that the upper plate 151 and the lower plate 152 have positive and negative electrodes, respectively, by doping an electrolytic material such as silicon having different polarities, and applying a predetermined voltage. It is configured to enable electrical connection with the driving circuit.

The driving plate for applying the positive and negative poles to the upper plate 151 or the lower plate 152 so as to generate attraction force by the movement of the positive and negative charges on the surfaces corresponding to each other. Furnace 161.

The upper plate 151 or the lower plate 152 may include an ISP 162 for processing an image signal formed by the image sensor 130 or may include a passive element 163 such as a capacitor or a resistor.

The driving circuit 161, the ISP 162, and the passive element 163 set in advance a place to be doped with a mask on the silicon wafers constituting the upper and lower plates 151 and 152, and only impurity vapor It is implemented by a semiconductor process that diffuses.

The light receiving penetrating penetrates a predetermined size so that light passing through the lens of the lens barrel 110 passes through the central region of the plate-shaped upper plate 151 and the lower plate 152 provided with the support parts 151a and 152a. Balls 155 and 156 are each formed.

In addition, the upper plate 151 and the lower plate 152 is electrically connected via a flexible substrate 165, the upper end of the flexible substrate 165 and the terminal portion formed on one side outer surface of the upper plate 151 and The lower surface of the flexible substrate 165 is connected to the other terminal portion formed on one outer surface of the lower plate 152, and the lower plate 152 is electrically mounted on the upper surface of the substrate 140.

Accordingly, the voltage and the signal supplied through the substrate 140 may be respectively supplied to the lower plate 152 and the upper plate 151 connected thereto via the flexible substrate 165.

On the other hand, the actuator 150 is applied to the upper plate 151 and the lower plate 152 by applying a predetermined voltage (approximately about 2.8v) to the positive and negative poles having different polarities through the driving circuit 161. When the upper plate 151 and the lower plate 152, the attraction force (pulling force) is generated to attract the corresponding surface to each other.

Therefore, the upper plate 151 is moved directly to the lower portion with respect to the lower plate 152 fixed in the lower portion, the gap between the upper and lower plates 151, 152 is narrowed, the lens barrel assembled with the upper plate 151 110 is lowered along the inner surface of the housing 120.

At this time, the elastic member 159 interposed between the upper and lower plates 151 and 152 is compressed as much as the gap between the upper and lower plates 151 and 152 is narrowed to generate elastic restoring force.

In this case, the focal length between the lens barrel 110 coupled to the upper plate 151 of the actuator 150 and the image sensor 130 exposed outside through the through hole 156 of the lower plate 152 is variable. The focus adjustment is automatically performed by adjusting the gap between the upper and lower plates flowing in accordance with the generated strength of the electric field generated with respect to the voltage applied to the upper plate 151 and the lower plate 152.

The strength of the electric field generated between the upper plate 151 and the lower plate 152 of the actuator 150 depends on the concentration of the electrolytic material doped on the corresponding surfaces of the upper and lower plates 151 and 152 made of silicon. To be adjusted accordingly.

On the other hand, when the application of the voltage through the driving circuit 161 electrically connected to the pair of upper plate 151 and the lower plate 152 is interrupted, the electric field formed in the actuator 150 is released and at the same time, Since it is the attraction between the lower plate 151, 152, the upper plate 151 is moved to the upper position by the elastic restoring force of the elastic member 159 is in place.

The auto focusing camera module 100 of the present invention having such a technical configuration includes a digital camera device including a mobile phone in which the driving circuit 161 provided in the actuator 130 in the housing 120 includes the camera module 100. When the shutter is pressed, the auto focusing (AF) adjustment is performed when the user presses the shutter, as the operation of the shutter functions as an on / off function of the switch installed in the driving circuit 161. It is done.

While the invention has been shown and described in connection with specific embodiments, it is to be understood that various changes and modifications can be made in the art without departing from the spirit or the scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

As described above, according to the present invention, the upper plate fixed to the lower end of the lens barrel and the lower plate provided on the substrate are arranged with a predetermined distance from each other, and the upper plate and the lower plate by applying a voltage to each having a different polarity It is equipped with an actuator to adjust the distance between the lower plate by the electric field method to provide a driving force for transferring the lens barrel in the optical axis direction to the image sensor, it is easy to adjust the electric field strength of the actuator by applying a voltage through the drive circuit camera module Auto focusing can be performed more easily.

In addition, by integrating the driving circuit for providing the voltage to the actuator, the ISP for processing the image signal, and the passive device, respectively, on the upper and lower plates, the size of the camera module can be miniaturized as compared with the conventional one. By deleting, work productivity can be improved.

Claims (12)

delete A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; The upper plate and the lower plate are made of a silicon material, and the lower surface of the upper plate and the upper surface of the lower plate corresponding to each other are doped with an electrolytic material having positive (+) polarity or negative (-) polarity when voltage is applied. Auto focusing camera module. A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; The upper plate and the lower plate is an auto focusing camera module, characterized in that provided with a surface corresponding to each other uneven. The auto focusing camera module of claim 3, wherein the uneven surface is provided in a triangular or quadrangular cross section. A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; An auto focusing camera module comprising a plurality of elastic members between the upper plate and the lower plate to elastically support the upper plate to the upper portion. According to claim 5, The elastic member is one side end of the upper plate and the opposite side edge facing the opposite end of the support portion extending a certain length to the lower portion, the one side end of the lower plate corresponding to the support portion of the upper plate and the opposite side end facing this Auto focusing camera module, characterized in that provided between the support portion extending a certain length to the upper portion from the rim. The method according to claim 2 or 3 or 5, The top plate or the bottom plate auto-focusing camera module, characterized in that it comprises a driving circuit for applying a (+) pole and (-) respectively to the top plate and the bottom plate. The method according to claim 2 or 3 or 5, The upper or lower plate is an auto focusing camera module, characterized in that it comprises an ISP for processing the image signal formed in the image sensor. The method according to claim 2 or 3 or 5, The upper or lower plate auto focusing camera module, characterized in that it comprises a passive element such as a capacitor, a resistor. A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; A flexible board is further included between the upper plate and the lower plate, and an upper end of the flexible board is connected to a terminal part formed on one side of the upper plate, and a lower end of the flexible board is connected to a terminal part formed on one side of the lower plate. Auto focusing camera module. A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; The upper plate and the lower plate are auto focusing camera module, characterized in that each having a light receiving through-hole in the center area. A lens barrel having at least one lens; A housing in which the lens barrel is assembled to be movable in the optical axis direction; A substrate having an image sensor electrically mounted to form an image of light passing through the lens; And The upper plate is fixed to the lower end of the lens barrel and the lower plate disposed at a predetermined interval there is a driving force for transferring the lens barrel in the optical axis direction by applying a voltage to the upper and lower plates, respectively, by adjusting the gap between the upper and lower plates Actuator to provide; Including; And the lower plate is electrically connected to an upper surface of the substrate.

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