KR100736610B1 - camera lens module - Google Patents

Abstract

A camera lens module for a mobile terminal, comprising: a lens group in which a plurality of lenses having a predetermined refractive index are arranged, and spaced apart from the lens group by a predetermined distance, and the curved surface is changed differently according to an external electrical signal. And a sensor for sensing an autofocused image from the variable focus mirror.

Varifocal mirror, lens group, sensor, curved surface, focusing

Description

Camera lens module

1A to 1E are cross-sectional views illustrating a camera lens module according to the first to fifth embodiments of the present invention.

2A is a side view of a variable focus mirror in accordance with the present invention

2b is a plan view of a variable focus mirror according to the present invention;

Explanation of symbols for main parts of the drawings

1: lens group 2: varifocal mirror

3: sensor 4: light splitter

5-7: 1st-3rd lens 8: Aperture

The present invention relates to a camera lens module, and more particularly to a camera lens module for a portable terminal.

Recently, the trend of distributing portable terminal products in which cameras are integrated into portable terminals such as mobile phones and PDAs to consumers has formed a mainstream.

Such cameras are configured to attach a lens to an imaging device such as a CCD or a CMOS to photograph a subject, and to record the photographed subject data through a predetermined recording medium.

In general, in the camera lens module, since the camera lens is a means for focusing, a driving means for moving the lens is required.

Therefore, conventionally, as a moving means, a DC motor, a step motor, a piezo motor, a voice coil motor (VCM), and the like have been used.

That is, the existing camera lens is moved by the moving means and is automatically focused by adjusting the distance interval.

However, since the conventional camera lens module needs to move and focus the lens, a moving means for moving the lens is required and a distance and a space for moving the lens must be secured.

Therefore, the existing camera lens module has a problem that is difficult to apply to downsizing the lens module.

In addition, in the conventional camera lens module, as a moving means used, the VCM has a problem of power waste because the power must be continuously supplied while the lens is focused, the piezo motor has a problem of difficult temperature and position control, DC motor Has a problem of low precision and large size, and the stepper motor has a big noise.

As described above, the camera lens module having the moving means generates a tilt or the like due to a mechanism and assembly tolerances when the lens module moves, and has a weak problem in dropping impact.

In particular, VCM is a structure that uses a leaf spring, so deformation may occur due to drop impact.

In the conventional camera lens module, since the lens moves, the focusing speed is different from the electronic or electrical control speed because the focusing speed varies depending on the characteristics of each device.

SUMMARY OF THE INVENTION An object of the present invention is to solve such problems, and to provide a camera lens module that can be downsized by configuring a camera lens module in a new form without a moving means for moving the lens.

Another object of the present invention is to provide a camera lens module that can improve reliability and reduce power consumption by performing a focusing function without moving the lens.

The camera lens module according to the present invention is a lens group in which a plurality of lenses having a predetermined refractive index are arranged, and is spaced apart from the lens group by a predetermined distance, and is different from the lens group by changing a value of a curved surface according to an external electrical signal. And a sensor for sensing an autofocused image from the variable focus mirror.

Herein, the lens group includes a first lens having both sides negative, a second lens disposed at a predetermined distance from the first lens, one side of the both sides being negative, and the other side being positive; A third lens disposed spaced apart from the two lenses at a predetermined interval and one side of the two surfaces being positive and the other surface negative, and an aperture disposed at a predetermined distance in front of the first lens or disposed between the first lens and the second lens. It can be configured to include.

In addition, the lens group includes a first lens having both sides negative, a second lens disposed at a predetermined distance apart from the first lens, and having a positive surface on both sides, and a second lens disposed at a predetermined interval spaced apart from the second lens. One side may be configured to include a third lens that is positive and the other surface is negative, and an aperture disposed between the second lens and the third lens.

The lens group includes a first lens having both surfaces positive, a second lens disposed at a predetermined distance from the first lens, one of which is positive and one of which is negative, and a first lens and a second lens. It may be configured to include an aperture disposed between.

The present invention may further include a light splitter disposed between the lens group and the variable focus mirror to transmit light incident from the lens group and reflect light incident from the variable focus mirror.

Here, the light splitter may be a beam splitter or a prism, and the surface of the variable focus mirror may be perpendicular to the optical axis incident from the light splitter.

The surface of the variable focus mirror has a free curved surface by an electrical signal, and the free curved surface may be manufactured to be symmetrical in the X-axis direction and asymmetrical in the Y-axis direction, and may be rotatable by an electrical signal.

In addition, the surface of the variable focus mirror may have a predetermined inclination with respect to the optical axis incident from the lens group, and the sensor is located in a direction perpendicular to the optical axis reflected from the variable focus mirror or faces the variable focus mirror. It can be located in the direction.

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, By the technical spirit of the present invention described above and its core configuration and operation is not limited.

The concept of the present invention is to provide a camera lens module that can focus the image without moving the lens group by arranging a variable focus mirror that performs a focusing function between the lens group and the sensor.

1A is a cross-sectional view illustrating a camera lens module according to a first embodiment of the present invention.

First, as shown in FIG. 1A, the first embodiment of the present invention is largely composed of a lens group 1, a variable focus mirror 2, and a sensor 3.

Here, the lens group 1 may be composed of a plurality of lenses having a predetermined refractive index, and the lens group 1 may have at least one aspherical surface.

The lens group 1 of the present invention is composed of at least one lens and one aperture. The lens group 1 of the first embodiment includes a first lens 5, a second lens 6, and a third lens. (7), and the aperture (8).

Both surfaces of the first lens 5 are negative, and the second lens 6 is spaced apart from the first lens 5 by a predetermined interval, one side of the both surfaces is negative, and the other side of the first lens 5 is negative. positive.

Here, the negative surface of the second lens 6 is arranged to be adjacent to the first lens 5.

The third lens 7 is disposed spaced apart from the second lens 6 by a predetermined interval, and one surface of both surfaces is positive and the other surface is negative.

Here, the positive face of the third lens 7 is arranged to be adjacent to the positive face of the second lens 6.

At this time, it is preferable that the focal length of the first lens 5 and the third lens 7 is greater than zero, and the focal length of the first lens 5 is larger than the focal length of the third lens 7.

In addition, the diaphragm 8 is disposed between the first lens 5 and the second lens 6 to interrupt the light.

The variable focus mirror 2 is disposed spaced apart from the lens group 1 by a predetermined interval, and performs a function of automatically focusing an image refracted from the lens group 1 according to an external electrical signal.

Here, the surface of the variable focus mirror 2 has a free curved surface by an electrical signal, which is symmetrical in the X-axis direction and asymmetrical in the Y-axis direction of the mirror surface.

2A is a side view of the variable focus mirror according to the present invention, and FIG. 2B is a plan view of the variable focus mirror according to the present invention.

As shown in Figs. 2A and 2B, the free curved surface of the variable focus mirror 2 should not have a symmetrical structure in the Y-axis direction, but should have a symmetrical structure in the X-axis direction.

That is, the free curved surface is line symmetrical about the Y axis.

In some cases, the variable focus mirror 2 is rotatable by an electrical signal.

The variable focus mirror 2 may be arranged to have a predetermined inclination with respect to the optical axis incident from the lens group 1, and in some cases, may be disposed perpendicularly to the incident optical axis.

In addition, the variable focus mirror 2 can deform the curved surface according to a design value by an electrical signal.

Therefore, the variable focus mirror 2 changes the electrical signal for focusing to change the value of the curved surface, thereby changing the curvature radius of the lens to perform the focusing.

As such, the variable focus mirror 2 can perform focusing only by micron-deformation without any mechanical element, thereby ensuring reliability, low power consumption, and miniaturization.

On the other hand, the sensor 3 is located in a direction perpendicular to the optical axis reflected from the variable focus mirror 2 or in a direction facing the variable focus mirror 2, so that the sensor 3 is automatically moved from the variable focus mirror 2. It senses the focused image.

Thus, the present invention constituted is operated as follows.

As shown in FIG. 1A, first, the lens group 1 collects light to form an external image, and corrects chromatic aberration, distortion, spherical aberration, coma, and the like with respect to the light.

Subsequently, when light is incident from the lens group 1, the variable focus mirror 2 changes a curved surface by an electrical signal to perform a focusing function.

The sensor 3 then senses the focused image.

As described above, the camera lens module operating according to the present invention can perform the auto focusing function by the variable focus mirror without moving the lens as in the prior art, thereby ensuring reliability, low power consumption, and miniaturization.

1B is a cross-sectional view illustrating a camera lens module according to a second exemplary embodiment of the present invention.

The second embodiment of the present invention has the same structure as the first embodiment of the present invention, and only the position of the diaphragm 8 is different.

As shown in FIG. 1B, the lens group 1 is disposed with a first lens 5 having both sides negative and a predetermined distance spaced apart from the first lens 5, and one side of both surfaces is negative. And a second lens 6, the other one of which is positive, and a third lens 7, which is disposed spaced apart from the second lens 6 by a predetermined distance, one of which is positive and the other of which is negative; 1 is composed of a diaphragm (8) spaced at a predetermined interval in front of the lens (5).

When the diaphragm 8 is positioned in front of the first lens 5, the length of the optical path is longer than that of the first embodiment of the present invention, and other performances and effects are the same as those of the first embodiment of the present invention.

1C is a cross-sectional view illustrating a camera lens module according to a third exemplary embodiment of the present invention.

As shown in FIG. 1C, the lens group 1 includes a first lens 5 having both sides negative and a first lens 5 disposed at a predetermined distance from the first lens 5 and having both sides positive. A second lens 6, a third lens 7 which is disposed spaced apart from the second lens 6 by a predetermined interval, and one surface of the both surfaces is positive and the other surface is negative, and the second lens 6 and the third lens ( 7) the diaphragm 8 is arranged between.

Here, the positive surface of the third lens 7 is arranged to be adjacent to the second lens 6.

The focal length of the first lens 5 and the third lens 7 is preferably greater than zero, and the focal length of the first lens 5 is larger than the focal length of the third lens 7.

The third embodiment of the present invention is characterized in that the first lens 5 is larger than the other lenses.

1D is a cross-sectional view illustrating a camera lens module according to a fourth exemplary embodiment of the present invention.

As shown in FIG. 1D, the lens group 1 is disposed to be spaced apart from the first lens 5 having a positive surface on both sides by a predetermined distance from the first lens 5, and one side of the lens group is positive and the other surface. Is composed of a negative second lens 6 and an aperture 8 disposed between the first lens 5 and the second lens 6.

Here, the positive surface of the second lens 6 is arranged to be adjacent to the first lens 5.

The fourth embodiment of the present invention is characterized by using only two lenses.

1E is a cross-sectional view illustrating a camera lens module according to a fifth exemplary embodiment of the present invention.

As shown in Fig. 1E, the fifth embodiment of the present invention is characterized in that the light splitting portion 4 is disposed between the lens group 1 and the variable focus mirror 2.

Here, the light splitter 4 may use a beam splitter, a panel splitter, a TIR prism, or the like.

The light splitter 4 transmits the light incident from the lens group 1 and reflects the light incident from the variable focus mirror 2 to the sensor 3.

In this case, the surface of the variable focus mirror 2 is characterized in that it is disposed perpendicular to the optical axis incident from the light splitting section 4.

As such, the camera lens module according to the present invention, which is configured in various forms, can be easily applied even in an environment having a small space, such as a mobile phone, since it is possible to miniaturize and reduce the weight because no mechanical device for moving the lens is required for focusing. have.

As described above, the camera lens module according to the present invention performs a focusing function using a varifocal mirror, so that the size and size of the camera lens can be reduced, and can be applied to portable devices such as a mobile phone. It is possible to design a wide range of applications.

In addition, since the present invention performs a focusing function without moving the lens, the reliability is improved and power consumption is reduced.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

Claims (18)

A lens group in which a plurality of lenses having a predetermined refractive index are arranged; A variable focus mirror disposed at a predetermined interval from the lens group and automatically focusing an image refracted from the lens group by changing a value of a curved surface according to an external electrical signal; And, And a sensor for sensing an autofocused image from the varifocal mirror. The camera lens module of claim 1, wherein the lens group has at least one aspherical surface. The camera lens module of claim 1, wherein the lens group includes at least one lens and one aperture. The method of claim 1, wherein the lens group A first lens having both sides negative; A second lens disposed spaced apart from the first lens by a predetermined distance, one side of which is negative and the other side being positive; A third lens disposed spaced apart from the second lens by a predetermined distance, one surface of which is positive and the other surface of which is negative; The camera lens module, characterized in that comprises a stop disposed in front of the first lens at a predetermined interval, or disposed between the first lens and the second lens. The camera lens module of claim 4, wherein the negative surface of the second lens is a surface adjacent to the first lens, and the positive surface of the third lens is a surface adjacent to the positive surface of the second lens. The camera lens module of claim 4, wherein a focal length of the first lens and a third lens is greater than zero, and a focal length of the first lens is larger than a focal length of the third lens. The method of claim 1, wherein the lens group A first lens having both sides negative; A second lens disposed to be spaced apart from the first lens by a predetermined interval, and having both surfaces positive; A third lens disposed spaced apart from the second lens by a predetermined distance, one surface of which is positive and the other surface of which is negative; And a stop disposed between the second lens and the third lens. The camera lens module of claim 7, wherein the positive surface of the third lens is a surface adjacent to the second lens. The camera lens module of claim 7, wherein a focal length of the first lens and a third lens is greater than 0, and a focal length of the first lens is larger than a focal length of the third lens. The method of claim 1, wherein the lens group A first lens having both surfaces positive; A second lens disposed spaced apart from the first lens by a predetermined interval, one surface of which is positive and the other surface of which is negative; And a diaphragm disposed between the first lens and the second lens. The camera lens module of claim 10, wherein the positive surface of the second lens is a surface adjacent to the first lens. The light emitting device of claim 1, further comprising a light splitter disposed between the lens group and the variable focus mirror to transmit light incident from the lens group and to reflect light incident from the variable focus mirror. Camera lens module characterized in that. The camera lens module of claim 12, wherein the light splitter is a beam splitter or a prism. The camera lens module of claim 13, wherein a surface of the variable focus mirror is perpendicular to an optical axis incident from the light splitter. The camera lens module of claim 1, wherein a surface of the variable focus mirror has a free curved surface by an electrical signal, and the free curved surface is symmetrical in the X-axis direction and asymmetrical in the Y-axis direction of the surface. . The camera lens module of claim 1, wherein the variable focus mirror is rotatable by an electrical signal. The camera lens module of claim 1, wherein a surface of the variable focus mirror has a predetermined inclination with respect to an optical axis incident from the lens group. The camera lens module of claim 1, wherein the sensor is positioned in a direction perpendicular to the optical axis reflected from the variable focus mirror or in a direction facing the variable focus mirror.

Images