KR101586244B1 - Camera module with zoom function - Google Patents

Abstract

The present invention relates to a camera module, and more particularly, to a camera module including a first lens unit having at least one lens for converting light incident from a subject into a specific magnification; A movable part fixing the first lens part; A fixing part for receiving the movable part; An autofocus driver installed in the movable part and the fixed part such that the movable part is driven in the optical axis direction; An infrared filter mounted on a lower end of the first lens unit; A displacement detecting sensor for sensing that the fixing portion is moving in a direction orthogonal to the optical axis; A reflecting unit positioned at a lower end of the fixing unit in an optical axis direction and reflecting the light incident from the first lens unit in a direction perpendicular to the optical axis; A second lens unit arranged along the optical path direction refracted from the reflection unit and arranged in the optical path direction; A motor unit for driving the second lens unit to perform a zoom function; A circuit board portion provided with an image sensor positioned opposite to a direction in which light reflected from the mirror portion at a right angle passes through the second lens portion; And an actuator for driving the circuit board portion in a direction orthogonal to a direction axis of the reflected light, wherein the actuator receives information of the displacement sensor, and the fixing portion moves in a direction orthogonal to the optical axis The camera module is provided with a zoom function.

Description

Camera module with zoom function "

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera module mounted on an electronic device for capturing an image, and more particularly, to a camera module structure capable of miniaturizing while having an auto focus function and a camera shake function.

The zoom has a varialble-focal length, and mainly has a front lens having a positive power and a rear lens having a negative power, and by their relative movement, In order to achieve zooming by adjusting the distance between the lenses, a zoom lens is generally used in a camera or the like to change the focal length of the lens to convert the lens into a wide-angle lens or a telephoto lens, As shown in Fig.

Such a zoom can largely be divided into an optical zoom and a digital zoom. The optical zoom is a zoom that uses an optical lens and relatively moves the optical lens to enlarge the subject by a variable focal length. The digital zoom is, for example, It is a zoom that enlarges an image from a CCD (Charge-Coupled Device) apart from an optical lens, such as enlarging an image in a graph program such as a photo shovel or ACDSee. Since the digital zoom expands the image from the CCD with the optical zoom, there is no space required for the focal length change such as the optical zoom, which is advantageous for the small size and the small size. However, Has a disadvantage in that a space according to a focal length change is required because the zoom is realized by changing the focal distance, which is larger than the required space rather than the digital zoom. On the other hand, a sharp resolution can be realized at zooming. In general, optical zoom capable of realizing high resolution is preferred to digital zoom, and the present invention also relates to optical zoom.

On the other hand, mobile terminals such as a mobile phone or a PDA having a camera as a medium for transmitting moving picture information have been developed and popularized. In order to satisfy various needs of consumers, such a portable terminal is used to enlarge a subject It has a zoom function that can be used. However, the portable terminal which has been developed so far has a digital zoom which can be manufactured in a smaller size due to the lack of space due to the change of the focal distance in accordance with the trend of small size and thinness, But does not utilize optical zoom that requires more space.

In order to solve the above problems, Korean Unexamined Patent Publication No. 2003-0091176 relates to a zoom lens device, which discloses a zoom lens device which can be coupled to an image pickup device and can be coupled to a portable communication device, an electronic device or the like. However, the above technique is not suitable for the camera module technology market, which has been recently downsized because the size of the camera module is increased by arranging all the lens barrels in a line.

Korea Patent Publication No. 2003-0091176

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a camera module capable of changing a light path by using a reflector to enable a small optical zoom.

In order to solve the above problems, the present invention has been completed by providing a camera module with a small optical zoom function by changing an optical path using a reflecting portion.

The present invention relates to a zoom lens comprising: a first lens unit having at least one lens for converting light incident from a subject into a specific magnification; A movable part fixing the first lens part; A fixing part for receiving the movable part; An autofocus driver installed in the movable part and the fixed part such that the movable part is driven in the optical axis direction; An infrared filter mounted on a lower end of the first lens unit; A displacement detecting sensor for sensing that the fixing portion is moving in a direction orthogonal to the optical axis; A reflecting unit positioned at a lower end of the fixing unit in an optical axis direction and reflecting the light incident from the first lens unit in a direction perpendicular to the optical axis; A second lens unit arranged along the optical path direction refracted from the reflection unit and arranged in the optical path direction; A motor unit for driving the second lens unit to perform a zoom function; A circuit board portion provided with an image sensor positioned opposite to a direction in which light reflected from the mirror portion at a right angle passes through the second lens portion; And an actuator for driving the circuit board part in a direction orthogonal to a direction axis of the reflected light, wherein the actuator receives information of the displacement sensor, and the fixing part moves in a direction orthogonal to the optical axis The camera module is provided with a zoom function.

The present invention also provides a camera module with a zoom function, wherein the reflector is a focus variable mirror or a prism.

The present invention also provides a camera module with a zoom function, which is a magnet, a voice coil, a piezoelectric element, or a shape memory alloy.

The present invention also provides a camera module with a zoom function, wherein the actuator is a magnet, a voice coil, a piezoelectric element, or a shape memory alloy.

The present invention also provides a zoom-function-equipped camera module in which the motor unit slides and drives the second lens unit.

The present invention also provides a camera module having a zoom function, which is a stepping motor, a voice coil motor, or a piezoelectric element actuator.

The present invention has the effect of enhancing the marketability in the camera module market which is miniaturized by changing the optical path using the reflection part, enabling the small optical zoom and reducing the camera thickness.

1 is a schematic diagram of a camera module having a zoom function.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Prior to the detailed description of the present invention, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

Here, in the entire drawings for explaining the embodiments of the present application, those having the same functions are denoted by the same reference numerals, and a detailed description thereof will be omitted.

In one aspect of the present invention, the present invention includes a first lens unit 10 having at least one lens for converting light incident from a subject into a specific magnification, as shown in FIG. 1; A movable part 20 fixing the first lens part 10; A fixing part (30) for receiving the movable part (20); An autofocus driving unit 70 installed in the movable unit 20 and the fixing unit 30 so that the movable unit 20 is driven in the direction of the optical axis 1; An infrared filter 40 mounted on the lower end of the first lens unit 10; A displacement detection sensor 50 for sensing that the fixing portion 30 is moving in a direction orthogonal to the optical axis 1; A reflector 60 positioned at a lower end of the fixing unit 30 in the direction of the optical axis 1 and reflecting light incident from the first lens unit 10 in a direction perpendicular to the optical axis 1; A second lens unit (11) arranged along the optical path direction refracted from the reflection unit (60) and arranged in the optical path direction; A motor unit (71) for driving the second lens unit to perform a zoom function; A circuit board portion provided with an image sensor (80) positioned opposite to a direction in which light reflected from the mirror portion at a right angle passes through the second lens portion (11); And an actuator (72) for driving the circuit board portion in a direction orthogonal to a direction axis of the reflected light. The actuator (72) receives information of the displacement sensor (50) Is a camera module with a zoom function that is driven to compensate for displacement caused by the movement of the section (30) in a direction orthogonal to the optical axis (1).

At least one or more lenses may be sequentially disposed on the first lens unit 10, and optical elements such as a shutter and a diaphragm may be interposed between the lenses. The infrared filter is attached to the lower end of the lens unit and is necessary for realistic color expression.

In one embodiment of the present invention, the reflector 60 includes a focus variable mirror or a prism. The focus variable mirror is a diffractive element composed of a plurality of mirrors and is a device for varying the focus of incident light by controlling each of a plurality of mirrors. The prism is an optical device for refracting and dispersing light, and is a device for changing the direction of light emitted from a light source. The prism and focus variable mirror in the present invention change the light passing through the first lens unit 10 in the vertical direction (y-axis direction in the figure). The reflector 60 is located at a lower end of the fixing unit 30 in the direction of the optical axis 1 and reflects light incident from the first lens unit 10 in a direction perpendicular to the first lens unit 10, So that an image is formed on the image sensor 80.

The autofocus driver 70 includes a magnet and a voice coil, a piezoelectric element, or a shape memory alloy.

Unlike general cameras, the method using the voice coil is mainly used for a camera module for a mobile phone having a limited size. An electromagnetic force acting between the magnet and the coil moves the bobbin up and down. As the lens fixed on the bobbin moves up and down Auto focus adjustment, auto zoom adjustment, and anti-shake functions are performed. In addition, it is a kind of moving coil type linear actuator, and its structure is simple, generating force is linearly generated in proportion to electric current, and control is simple, and environmental resistance and durability are excellent. Also, As shown in Fig.

The piezoelectric element method is a piezoelectric ceramic method in which an ultrasonic precision motor is manufactured and then the motor is driven using ultrasonic waves. However, the piezoelectric element method has a merit that the volume is smaller than that of the conventional stepping motor method, but the hysteresis and the friction portion are worn out quickly There are disadvantages. Various types of piezoelectric ceramic motors have been developed, but there are not many official methods. The recently developed piezoelectric element motor can make the piezoelectric ceramic material into a helical shape, thereby increasing the length of the piezoelectric ceramic material to a sufficiently large amount of deformation with respect to the unit voltage.

In the present invention, a shape memory alloy may have a martensite phase at a certain transition temperature or lower and may cause shape deformation. However, after such deformation, the shape memory alloy may have a transition temperature Is a material having a property that a phase change occurs in austenite phase when the temperature rises and returns to the previous shape. When the shape memory alloy is used to manufacture an actuator, it is advantageous in that it is light in weight, cheap, and has no noise, thus replacing solenoids and motors in various parts.

Further, in one embodiment of the present invention, the actuator 72 includes a magnet and a voice coil, a piezoelectric element, or a shape memory alloy. The actuator 72 is mounted on the circuit board portion 90 located on the side of the first lens portion 10, the movable portion 20 and the auto focus driving portion 70 and does not affect the thickness of the camera, This is in line with the trend of recent cameras that are lightweight. Also, since the weight of the lens unit driven by the auto-focus driving unit 70 is not affected, the amount of current consumed in driving the lens unit up and down may not be affected.

The motor unit 71 includes a second lens unit 11 disposed along the optical path 2 refracted from the reflecting unit 60 and arranged in the optical path 2, And the zoom function is driven by sliding movement. The motor unit 71 includes a stepping motor, a voice coil motor, or a piezoelectric element actuator. The stepping motor is a motor that rotates at a constant angle according to inputting an external DC voltage or current to each terminal of the motor in a switching manner. Therefore, it is a kind of digital control type device and is suitable for digital pulse type control rather than general analog power supply. One digital pulse makes precise rotational motion by the rotation angle corresponding to one step, and continuous motion is performed in proportion to the number of input pulses and the pulse input speed per unit time. In addition, the open-loop control is possible by rotating the input pulse with a large starting torque, and does not return to the initial point after the applied voltage is removed, so there is no power consumption for maintaining the position and the manufacturing cost is low.

Voice coil motors are widely used for small electronic devices and precision control applications because they can be operated with low power consumption with fast response, linearity, small size, etc. Voice coil motors are generally made of soft steel and permanent magnets, It is a structure that places a coil in an airgap in a magnetic circuit. The operation of the voice coil motor is operated by the Lorentz force generated when a current flows through the coil in the magnetic field formed by the magnet. At this time, the direction of the force is determined by Fleming's left hand rule. Thus, the voice coil motor is small in size, light in weight, and simple in operation. Since the reduction gear is not used, there is an advantage that the backlash does not occur and the initial setting is facilitated by returning to the initial point when power is removed.

Piezoelectric actuators have high torque at low speed, high output density, little influence of inertia, and good starting and stopping characteristics. In addition, various shapes of actuators can be manufactured depending on the shape of the stator, and electromagnetic induction is not generated because electromagnetic waves are not generated.

The image sensor is mounted on the upper surface of the circuit board unit 90 and receives the information of the displacement sensor 50. The displacement of the fixing unit 30 in the direction orthogonal to the optical axis 1 And an actuator 72 driven to compensate.

The displacement sensor 50 is provided with a displacement sensor (X axis) 51 for detecting the X axis change and a displacement sensor (Y axis) 52 for sensing the Y axis change so as to face each other Resistive, capacitive, magnetic (magnetic), as well as a resistive detector that provides a voltage output corresponding to a change in resistance proportional to the movement of the fixture 30, ), A hall sensor, and the like are all applicable to the present invention.

While the present invention has been described in connection with what is presently considered to be the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, .

All technical terms used in the present invention are used in the sense that they are generally understood by those of ordinary skill in the relevant field of the present invention unless otherwise defined. The contents of all publications referred to herein are incorporated herein by reference.

1. Optical axis
2. Light path
10. The first lens unit
11. Second lens unit
20. Movable part
30. Fixed Government
40. Infrared filter
50. Displacement sensor
51. Displacement sensor (X axis)
52. Displacement sensor (Y axis)
60. Reflective portion
70. Automatic focus drive unit
71. Motor section
72. Actuator
80. Image sensor
90. Circuit board part

Claims (6)

A first lens unit having at least one lens for converting light incident from a subject into a specific magnification;
A movable part fixing the first lens part;
A fixing part for receiving the movable part;
An autofocus driver installed in the movable part and the fixed part such that the movable part is driven in the optical axis direction;
An infrared filter mounted on a lower end of the first lens unit;
A displacement detecting sensor for sensing that the fixing portion is moving in a direction orthogonal to the optical axis;
A reflecting unit positioned at a lower end of the fixing unit in an optical axis direction and reflecting the light incident from the first lens unit in a direction perpendicular to the optical axis;
A second lens unit arranged along the optical path direction refracted from the reflection unit and arranged in the optical path direction;
A motor unit for driving the second lens unit to perform a zoom function;
A circuit board portion provided with an image sensor positioned opposite to a direction in which light reflected from the mirror portion at a right angle passes through the second lens portion; And
And an actuator for driving the circuit board portion in a direction orthogonal to a direction axis of the reflected light,
Wherein the actuator receives information of the displacement sensor and is driven to compensate displacement caused by movement of the fixed portion in a direction orthogonal to the optical axis,
Wherein the autofocus driver is a magnet, a voice coil, a piezoelectric element, or a shape memory alloy,
Wherein the motor unit is driven by sliding the second lens unit,
Camera module with zoom function.
The method according to claim 1,
Wherein the reflective portion is a focal point varying mirror or prism,
Camera module with zoom function.
delete The method according to claim 1,
The actuator may be a magnet and a voice coil, a piezoelectric element or a shape memory alloy,
Camera module with zoom function.
delete The method according to claim 1,
Wherein the motor unit is a stepping motor, a voice coil motor, or a piezoelectric element actuator,
Camera module with zoom function.

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