KR20060067439A - A reflector type camer a module - Google Patents

Abstract

A reflective camera module is provided.

The reflective camera module of the present invention includes a lens barrel having an internal space of a predetermined size; A first lens group disposed within the lens barrel so as to reciprocate along a vertical optical axis; An image sensor integrally connected to the first lens group via a connecting member; A first reflecting mirror reflecting light projected through the first lens group at 90 degrees; A second lens group projecting the light reflected by the first reflecting mirror; A third lens group disposed behind the second lens group so as to reciprocate along a horizontal optical axis; A second reflecting mirror reflecting light projected through the third lens group by 90 degrees to form an image on the image sensor; First driving means for reciprocating the first lens group and the image sensor; and second driving means for reciprocating the third lens group; It includes.

According to the reflective camera module of the present invention, an effect of miniaturizing the finished product and reducing the driving time is obtained by reducing the variable driving distance between lenses during zoom driving to half level.

Reflective, Camera module, Lens group, Reflective mirror, Image sensor, Driving means

Description

Reflective Camera Module {A REFLECTOR TYPE CAMER A MODULE}             

1 is a block diagram illustrating a camera module provided in a general terminal.

2 is a block diagram illustrating a reflective camera module according to the present invention.

Figure 3 (a) (b) (c) is a state diagram used in the reflective camera module according to the present invention.

Explanation of symbols on the main parts of the drawings

101: lens barrel 102: aperture

111: first lens group 112: second lens group

113: third lens group 120: image sensor

125: connecting member 131: first reflection mirror

132: second reflecting mirror 141: first driving means

142: second drive means H: barrel height

The present invention relates to a reflective camera module, and more particularly, to a reflective camera module capable of miniaturizing a finished product and reducing a zoom driving time by reducing a variable driving distance between lenses during zoom driving in half.

In recent years, due to the development of the electronic communication industry, portable wireless terminals (hereinafter, referred to as terminals) are becoming increasingly thin and small, and their functions are diversifying. For example, the function of the terminal is gradually diversified according to various needs of consumers. Recently, in addition to the basic call function of the terminal, the terminal is used to play games, search the Internet, receive and send e-mails, pay bills, etc. Many of the same features are being added.

In addition, a camera phone terminal in which a camera module is installed in a terminal and a camera function of taking a moving picture and a still picture of a subject and storing the same, and transmitting the same to a counterpart is merged is commercially available.

These devices are not merely a function of taking an object, but additional functions such as a focus function for adjusting the focus of an object to be photographed and a zoom function for making a far object closer or closer to a far object are added. to be.

FIG. 1 is a block diagram illustrating a camera module provided in a general terminal. In the conventional camera module 10, as shown in FIG. A first lens 11 forward and backward and a third lens 13 forward and backward in the optical axis direction with respect to the second lens 12 are provided in the barrel not shown.

In addition, an image sensor 16 is provided at a lower portion (on the drawing) of the barrel that intersects the optical axis of the first, second, third lenses 11, 12, 13 to form an image of a subject to be photographed. The output of the image sensor 16 is transmitted to the display device (not shown) of the terminal through an image processing device (not shown).

In addition, the driving force when the power is applied to the first lens 11 and the third lens 13 such as a stepping motor so as to vary the distance L1 and L2 between the second lens 12 disposed therebetween. Zoom driving means 14 and focusing driving means 15 are provided.

The lens frames provided to the first and third lenses 11 and 13 are screwed to the zoom and focusing screws 17 and 18, respectively, and drive gears 15a of the driving means 15 and 16 respectively. When the 16a is assembled to the driven gears 17a and 18a which are assembled on the upper ends of the screws 17 and 18, the screws 17 and 18 are driven by the driving means 17 and 18. It is rotated in the forward and reverse directions, thereby changing the driving distance L1 (L2) between the first and third lenses 11 and 13 and the second lens 12 to perform a zooming function and a focusing function. Will be.

However, in the conventional camera module 10, since the driving distances L1 and L2 for zooming and focusing are formed along a vertical optical axis, the first, second and third lenses 11, 12 and 13 are formed. There is a limit in reducing the height and length of the lens barrel provided with), which makes it difficult to design for downsizing the camera module 10.

In addition, when the driving distance between the first and third lenses 11 and 13 and the second lens 12 is increased, the lens driving time for the zoom function is long.

Therefore, the present invention is to solve the above-mentioned conventional problems, the object of which is to reduce the height of the barrel and reduce the length of the barrel by reducing the variable driving distance between the lens at the time of zoom driving can be miniaturized the finished product To provide a reflective camera module.

In addition, another object of the present invention is to provide a reflective camera module that can reduce the time required to drive the lens during zoom driving by reducing the variable drive distance between the lenses for zoom driving.

As a technical configuration for achieving the above object, the present invention,

A lens barrel having an internal space of a predetermined size;

A first lens group disposed within the lens barrel so as to reciprocate along a vertical optical axis;

An image sensor integrally connected to the first lens group via a connecting member;

A first reflecting mirror reflecting light projected through the first lens group at 90 degrees;

A second lens group projecting the light reflected by the first reflecting mirror;

A third lens group disposed behind the second lens group so as to reciprocate along a horizontal optical axis;

A second reflecting mirror reflecting light projected through the third lens group by 90 degrees to form an image on the image sensor;

First driving means for reciprocating the first lens group and the image sensor; and

Second driving means for reciprocating the third lens group; It provides a reflective camera module comprising a.

Preferably, the front of the first lens group is provided with a photographing lens for blocking the opening of the lens barrel.

Preferably, the connecting member is disposed in parallel with the horizontal optical axis of the light projected onto the second and third lens groups.

Preferably, the image sensor is provided with a low pass filter and an ultraviolet filter on the front surface corresponding to the first reflection mirror.

Preferably, the second lens group is positioned in the lens barrel.

Preferably, the first lens group is composed of a lens having a negative refractive index as a whole.

Preferably, the second lens group is composed of a lens having a negative refractive index as a whole.

Preferably, the third lens group is composed of a lens having a positive refractive index as a whole.

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

2 is a block diagram illustrating a reflective camera module according to the present invention. Figure 3 (a) (b) (c) is a state diagram used in the reflective camera module according to the present invention.

As shown in FIG. 2, the camera module 100 of the present invention includes a lens barrel 101 having an internal space of a predetermined size, and one side of the lens barrel 101 has light of a subject to be photographed. An opening 102 is formed to penetrate to a predetermined size so as to be incident.

A fixed lens 103 is mounted in the opening 102 to allow light to pass through the lens barrel 101 in the vertical direction on the drawing.

The lens barrel 10 includes a first lens group 111 disposed reciprocally along a vertical optical axis of light passing through the fixed lens 103, and the first lens group 111. It is preferable that the at least one lens is configured to have a negative refractive index in order to diverge the light projected thereto.

In addition, one end of the connecting member 125 having a predetermined length is integrally connected to the lens frame of the first lens group 111, and the other end of the connecting member 125 is integrally provided with the image sensor 120. The front surface of the image sensor 120 in which an image is formed is disposed downward to correspond to each other with the second reflection mirror 132 which will be described later.

In addition, a first reflecting mirror 131 having a reflecting surface inclined at 45 degrees with respect to a horizontal plane is provided under the first lens group 111 so as to reflect the projected light through 90 degrees so as to change the optical axis. .

Accordingly, the light projected through the first lens group 111 is changed at right angles from the vertical optical axis to the horizontal optical axis by the first reflection mirror 131.

In addition, a second lens group 112 is disposed at the rear of the first reflecting mirror 131 so that the light reflected by the first reflecting mirror 131 is diverged and transmitted through the rear, and the second lens group 112 is negative. It is preferred to consist of at least one lens having a refractive index of (-).

Accordingly, the vertical optical axis between the first lens group 111 and the first reflection mirror 131 is converted into a vertical optical axis by the first reflection mirror 131 to pass through the second lens group 112. It is projected backwards.

In addition, a rear side of the second lens group 112 is provided with a third lens group 113 to move back and forth along a horizontal optical axis, and the third lens group 113 has the light projecting it backwards. It is preferable that the lens is composed of at least one lens having a positive refractive index so as to be converged and imaged in the image sensor 120.

In addition, between the third lens group 113 and the image sensor 120 with respect to the horizontal plane to reflect the light projected backward through the third lens group 113 by 90 degrees to change the optical axis back to the vertical direction A second reflecting mirror 132 having a reflecting surface inclined at 45 degrees is provided.

In addition, the first driving means 141 generates a driving force for simultaneously driving the first lens group 111 and the image sensor 120 up and down in the vertical optical axis direction, and the first lens group 111 and the first lens group 111. By transmitting to the image sensor 120, the driving distance between the first lens group 111 and the second lens group 112 and the driving distance between the image sensor 120 and the second lens group 112 at the same time variable It is disposed in the inner space of the lens barrel 101 to enlarge or reduce the image formed in the support sensor 120 according to the variable amount of the drive distance.

The first driving means 141 is preferably configured to be connected to the connecting member 125 for integrally connecting the first lens group 111 and the image sensor 120 so as to drive them simultaneously.

In addition, the second driving means 142 transmits a driving force for driving the third lens group 113 back and forth in the horizontal optical axis direction alone to the third lens group 113, thereby providing the second lens group ( The focus distance of the light is focused so that the image is accurately formed on the image sensor 120 by varying the driving distance between the 112 and the third lens group 113.

The second driving means 142 is preferably connected to the lens frame of the third lens group 113 so as to drive the third lens group 113 alone.

As shown in FIG. 2, the first and second driving means 141 and 142 employ a gear member and a screw member to convert rotational driving force of a motor member such as a stepping motor and an ultrasonic motor into a linear reciprocating motion. Although not limited thereto, an actuator capable of generating a reciprocating driving force in a vertical or horizontal direction such as a piezo, a solenoid, a relay, and a magnet may be selectively employed without limitation.

Then, the power transmission structure between the first driving means 141 and the connecting member 125 and the second driving means 142 and the third according to the type of the first and second driving means (141, 142). The power transmission structure between the lens group 113 is changed.

An operation of enlarging or reducing an object to be photographed by performing a zooming operation using the camera module having the above-described configuration is performed so that the inclined surface inclined at an inclination of 45 degrees corresponds to that shown in FIG. A second lens group 112 having an overall negative refractive index and a third lens group 113 having an overall positive refractive index are disposed between the first and second reflecting mirrors 131 and 132, and the first reflection A first lens group 111 having a negative refractive index is disposed in front of the mirror 131.

In this state, the light is projected backward through the first lens group 111 and diverged, so that the optical axis is switched from the vertical direction to the horizontal direction by the first reflection mirror 131, and the light converted to the horizontal direction is The light projected to the third lens group 113 while being projected backward through the second lens group 112 and diverged, the light projected to the third lens group 113 converges backward, and the first lens group An image is formed on the image sensor 120 which is integrally connected through the 111 and the connecting member 125.

In this case, since the second reflecting mirror 142 is provided between the third lens group 113 and the image sensor 120, the light projected onto the third lens group 113 is reflected by the second reflecting mirror. By (! 42) it is changed from the horizontal optical axis to the vertical optical axis to obtain a zoom ratio of 1 to the image sensor 120.

Subsequently, when zooming in to zoom in on a subject to be photographed, power is supplied to the first driving means 141 to directly and downwardly connect the connecting member 125 as shown in FIG. 3 (b) (c). By gradually moving downward by a predetermined distance, the distance between the image sensor 120 and the second reflection mirror 142 is gradually stepped while narrowing the distance between the first lens group 111 and the first reflection mirror 141 step by step. And the subjects projected to the first, second, and third lens groups 111, 112, and 113 are applied to the image sensor 120 according to the stepwise stop positions of the first lens group 111. The image is enlarged at a zoom factor of 2 or 3 times.

At the same time, power is supplied to the second driving means 141 to move the third lens group 113 disposed at the rear of the second lens group 112 forward by a predetermined distance step by step, thereby providing the second lens group. The aberration correction is performed while the distance between the 112 and the third lens group 113 is narrowed, and the light reflected by the second reflecting mirror 142 is focused on the image sensor 120.

In this case, the focal length from the first lens group 111 to the image sensor 120 is varied by the movement of the first lens group 111, in addition to the vertical movement of the first lens group 111. Since the image sensor 120 is also moved in the same direction, a zoom factor of 2 or 3 times can be accurately obtained even if the length of the first lens group is substantially driven in the vertical optical axis direction for the zooming operation as described above. It can be.

That is, when the distance between the first lens group and the second lens group is maximized, it is in a state in which there is no zoom function of 1 times, and the distance between the first lens group 111 and the second lens group 112 is increased. If minimized, this will have the maximum zoom factor. However, this embodiment is not limited to the present invention, and if the lens is changed, the zoom ratio may be implemented in a case opposite to that described above.

When the driving distance with respect to the vertical optical axis of the first lens group 111 is reduced by half, the lens barrel 101 into which the first, second, and third lens groups 111, 112, and 113 are embedded. The barrel height H in the vertical optical axis direction can be lowered accordingly to reduce the size.

In addition, the focal length from the first lens group 111 to the image sensor 120 is a vertical length related to the first lens group 111 and a horizontal length related to the second and third lens groups 112 and 113. And another vertical length related to the image sensor 120, so that the first, second, and third lens groups 111, 112, and 113 may include a lens barrel in a horizontal optical axis direction. The length L can also be shortened and designed accordingly.

In addition, when the driving distance of the first lens group 111 for the 2x or 3x zoom factor is reduced by half, the time for driving the first lens group 111 is also reduced, thereby shortening the zooming time. It can be.

According to the present invention having the above-described configuration, by integrating the first lens group and the image sensor with each other, and simultaneously moving the first lens group and the image sensor in the vertical direction at the time of zoom driving, the driving distance between the lenses can be reduced by half Therefore, it is possible to reduce the height of the barrel and reduce the length of the barrel to further miniaturize the finished product.

In addition, since the driving time required to drive the lens during zoom driving can be reduced, the zooming time can be shortened.

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.

Claims (8)

A lens barrel having an internal space of a predetermined size; A first lens group disposed within the lens barrel so as to reciprocate along a vertical optical axis; An image sensor integrally connected to the first lens group via a connecting member; A first reflecting mirror reflecting light projected through the first lens group at 90 degrees; A second lens group projecting the light reflected by the first reflecting mirror; A third lens group disposed behind the second lens group so as to reciprocate along a horizontal optical axis; A second reflecting mirror reflecting light projected through the third lens group by 90 degrees to form an image on the image sensor; First driving means for reciprocating the first lens group and the image sensor; and Second driving means for reciprocating the third lens group; Reflective camera module comprising a. The method of claim 1, Reflective camera module, characterized in that the front of the first lens group is provided with a photographing lens for blocking the opening of the lens barrel. The method of claim 1, And the connection member is disposed in parallel with a horizontal optical axis of light projected on the second and third lens groups. The method of claim 1, The image sensor is a reflective camera module, characterized in that the low pass filter and the ultraviolet filter is provided on the front surface corresponding to the first reflecting mirror. The method of claim 1, And the second lens group is fixed in the lens barrel. The method of claim 1, The first lens group is composed of a lens having a negative refractive index as a whole. The method of claim 1, The second lens group is composed of a lens having a negative refractive index as a whole. The method of claim 1, The third lens group is a reflective camera module, characterized in that consisting of a lens having a positive refractive index as a whole.

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