KR100774560B1 - An small zoom image photographing device - Google Patents

Abstract

A compact zoom camera apparatus capable of zoom adjustment is disclosed. The disclosed camera apparatus includes a first lens for fixing to a case, a first driving lens unit including a compensation lens group, and a first magnet and a first magnet for driving the first driving lens unit in an optical axis direction under the magnetic flux of the first magnet. The optical axis of the first coil, the first position detecting unit for detecting the position of the first driving lens unit, the second driving lens unit including the displacement lens group, and the second driving lens unit under the magnetic flux of the second magnet and the second magnet. A second coil for driving in a direction, a second position sensing unit for sensing a position of the second driving lens unit, a control unit for driving the first coil and the second coil, a compensation lens group and the displacement lens group It has an image sensor for capturing an image of a subject. Such a camera device uses a small coil and a magnet to drive two movable lens units to form a zooming method, thereby miniaturizing the size of the camera device so that zooming is possible even in a small communication device such as a mobile phone. Possible camera devices can be applied.

Communication device, zoom, camera

Description

Mini Zoom Camera Unit {AN SMALL ZOOM IMAGE PHOTOGRAPHING DEVICE}

1 is a schematic view of a general camera device;

FIG. 2 is a view of a zooming state in FIG. 1;

3 is a view showing a movement trajectory of the lens group shown in FIG. 1;

4 is a perspective view showing an example of a conventional compact zoom camera device;

5 is a schematic top view of a compact zoom camera device according to an embodiment of the present invention;

6 is a left longitudinal cross-sectional view of the camera device shown in FIG. 5;

FIG. 7 is a right longitudinal cross-sectional view of the camera device shown in FIG. 5.

<Explanation of symbols for main parts of drawing>

100: case 110: fixed lens group

120: first driving lens portion 122: first closed holder portion

124: first open type holder portion 130: magnet

132: York 140: first coil

150: first hall sensor 160: second driving lens unit

170: second coil 180: second hall sensor

190: image sensor 192: infrared cut filter

200: first main shaft 202: first sub shaft

210: second main shaft 212: second sub shaft

The present invention relates to a small zoom camera device, and more particularly, by configuring a camera device in which a two-sized lens unit is used to adjust the magnification by using a small coil and a magnet, thereby miniaturizing the size of the camera device. It is to apply a camera device that can zoom in a small communication device such as a mobile phone.

1 is a schematic configuration diagram of a general small zoom camera device, and FIG.

The compact zoom camera device is configured to display an image passing through a compensation lens group 10 for compensating focus, a displacement lens group 20 for changing a magnification, and a compensation lens group 10 and a displacement lens group 20. It is composed of an image sensor 30 for picking up and converting into an electrical signal.

In order to change the zoom ratio, the compensation lens group 10 and the displacement lens group 20 must be interlocked in accordance with the zoom trajectory coming from the design data of the lens optical system.

The position of the compensation lens group 10 and the displacement lens group 20 with respect to the position of the sensor 30 depends on the design of the lens. In this example, the side closer to the sensor 30 is designed as the displacement lens group 20. It became.

2 shows a movement trajectory of the lens group in which the zoom is performed in such a small zoom camera device.

While the second movement trajectory 22 of the displacement lens group 20 has a large displacement, the first movement trajectory 12 of the compensation lens group 10 has only a fine displacement.

On the other hand, the cam structure is typically used to implement the zoom trajectory linkage of the compensation lens group 10 and the displacement lens group 20.

4 is an embodiment of a conventional zoom camera apparatus.

The compensation lens group 10 is mounted on the first barrel 40, and the displacement lens group 20 is mounted on the second barrel 44. The first driving pin 42 formed on the first barrel 40 moves along the first movement trajectory 12 in the rotary barrel 50 located at the outer circumference of the first barrel 40 and the second barrel 44. A first cam groove 54 for guiding the second cam groove 54 is formed, and the second cam groove 56 for guiding the second driving pin 46 formed in the second barrel 44 to move along the second movement trajectory 22. Is formed. The rotary shaft 50 is formed with a gear tooth 52 for receiving power from the drive gear 72 of the drive motor 70.

As the drive motor 70 rotates, the drive gear 72 rotates the gear tooth 52 so that the rotating barrel 50 rotates.

And the fixing barrel 60 is installed on the outer circumference of the rotating barrel 50, the fixing barrel 60 is a slot for guiding the first driving pin 42 and the second driving pin 46 to move in the optical axis direction ( 62) is formed.

When the drive motor 70 rotates and the drive gear 72 rotates the gear tooth 52, the rotating barrel 50 and the first cam groove 54 and the second cam groove 56 formed thereon rotate. The first driving pin 42 and the second driving pin 46 are prevented from rotating by the slot 62, so that a change in height occurs. That is, the first driving pin 42 and the second driving pin 46 are zoomed as shown in FIG. 2.

On the other hand, since the degree of focus on the sensor 80 changes according to the distance of the subject, a good image can be obtained only by refocusing according to the distance of the subject. To this end, a sensor 80 for capturing an image of a subject passing through the compensation lens group 10 and the displacement lens group 20 is installed on the attachment plate 82. And the adjustment motor 90 which rotates the lead screw 92 for adjusting the position of the attachment plate 82 is installed.

When the adjustment motor 90 rotates the lead screw 92, the mounting plate 82 and the sensor 80 is driven in the optical axis direction, so that the sensor is in the optimum focus position when taking the image.

However, such a conventional zoom camera device uses a drive source consisting of two bulky motors and a plurality of gears as a power transmission structure, so that the volume of the camera device becomes large so that it can be applied to a small sized communication device. There was a difficult problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to configure a camera device in which a magnification is adjusted by driving two movable lens units using a small coil and a magnet, thereby providing a size of the camera device. It is to apply a camera device capable of zooming in a small communication device such as a mobile phone by miniaturizing the size.

The present invention for achieving the above object,

case;

A fixed lens group fixed to the case;

A first driving lens unit including a compensation lens group in which the fixed lens group and the optical axis are aligned;

A first magnet fixed to one side of the first driving lens unit and the case;

One of the first driving lens unit and the case is fixed to a side where the first magnet is not fixed, and when power is applied, generates an electromagnetic force for driving the first driving lens unit in the optical axis direction by receiving the magnetic flux of the first magnet. A first coil wound to make;

A first position detecting unit fixed to the case to sense a position where the first driving lens unit is moved in the optical axis direction;

A second driving lens unit including the fixed lens group and a displacement lens group in which the compensation lens group and the optical axis are aligned;

A second magnet fixed to one side of the second driving lens unit and the case;

The second magnet is fixed to a side where the second magnet is not fixed among the second driving lens unit and the case, and when electric power is applied, generates an electromagnetic force for driving the second driving lens unit in the optical axis direction by receiving the magnetic flux of the second magnet. A second coil wound to make;

A second position detecting unit fixed to the case to sense a position where the second driving lens unit is moved in the optical axis direction;

The first coil is driven to receive the information of the first position detection unit and moves the compensation lens group to a magnification change position, and the first to receive the information of the second position detection unit and moves the displacement lens group to a magnification change position. A control unit for driving two coils; And

It provides a compact zoom camera device comprising an image sensor for picking up the image of the subject passing through the compensation lens group and the displacement lens group.

The first magnet and the second magnet are integrally formed.

The case is provided with a yoke for focusing the magnetic flux of the first magnet and the second magnet in the vicinity of the first coil and the second coil.

The first driving lens unit is guided to drive in the optical axis direction by a first shaft fixed to the case. The first shaft may be slidably coupled to a first main shaft that is slidably coupled to a first closed holder part formed on the first driving lens part, and to a first open holder part formed on the first driving lens part. It consists of a first sub shaft coupled to.

The second driving lens unit is guided to drive in the optical axis direction by a second shaft fixed to the case. The second shaft is slidable to a second main shaft slidably coupled to a second closed holder portion formed on the second driving lens portion, and to a second open holder portion formed on the second driving lens portion. It consists of a second sub shaft that is coupled securely.

The first position detecting unit includes a first hall sensor fixed to one side of the first driving lens unit and the case, and a first hall sensor fixed to the other side and having a first magnet for magnetic generation. The second position detecting unit includes a second detecting unit fixed to one side of the second driving lens unit and the case, and a second hall sensor fixed to the other side and having a second magnetic generating magnet.

The controller receives the information of the image sensor and performs a focusing operation to finely drive the first coil and the second coil when the image quality of the subject captured by the image sensor is blurred.

Hereinafter, a preferred embodiment of a compact zoom camera device according to the present invention will be described in detail with reference to the accompanying drawings.

5 is a schematic plan view of a compact zoom camera device according to an embodiment of the present invention, FIG. 6 is a left longitudinal cross-sectional view of the camera device shown in FIG. 5, and FIG. 7 is a right longitudinal cross-sectional view of the camera device shown in FIG. 5. to be.

The camera device shown in this figure includes a case 100; A fixed lens group 110 fixed to the case 100; A first driving lens unit 120 including a fixed lens group 110 and a compensation lens group in which optical axes are aligned; A magnet 130 fixed to the case 100; It is fixed to the first driving lens unit 120, the first winding wound to generate an electromagnetic force for driving the first driving lens unit 120 in the optical axis direction by receiving the magnetic flux of the first magnet 130 when power is applied Coil 140; A first position detecting unit fixed to the case 100 to sense a position where the first driving lens unit 120 is moved in the optical axis direction; A second driving lens unit 160 including a fixed lens group 110 and a displacement lens group in which the compensation lens group and the optical axis are aligned; The second coil fixed to the second driving lens unit 160 and wound to generate an electromagnetic force for driving the second driving lens unit 160 in the optical axis direction by receiving the magnetic flux of the magnet 130 when power is applied ( 170); A second position detecting unit fixed to the case 100 to detect a position where the second driving lens unit 160 moves in the optical axis direction; The first coil 140 is driven to receive the information of the first position detection unit and moves the compensation lens group to the magnification change position, and the second coil (receives information of the second position detection unit and moves the displacement lens group to the magnification change position). A controller (not shown) for driving 170; And an image sensor 190 for capturing an image of the subject passing through the compensation lens group and the displacement lens group.

The first magnet 130 and the second magnet 130 are integrally formed.

The case 100 is provided with a yoke 132 for focusing the magnetic flux of the first magnet 130 and the second magnet 130 in the vicinity of the first coil 140 and the second coil 170. The yoke 132 has a shape passing through the rear surface of the magnet 130 and the insides of the first coil 140 and the second coil 170 wound.

The first driving lens unit 120 is guided to drive in the optical axis direction by the first shaft fixed to the case 100. The first shaft is formed on the first main shaft 200 and the first driving lens unit 120 to be slidably coupled to the first closed holder part 122 formed on the first driving lens unit 120. It consists of a first sub-shaft 202 slidably coupled to the first open holder portion 124 to be. Coupling the first sub shaft 202 to the first open holder portion 124 formed in the open direction is to reduce the friction force.

The second driving lens unit 160 is guided to drive in the optical axis direction by a second shaft fixed to the case 100. The second shaft is formed on the second main shaft 210 and the second driving lens unit 160 slidably coupled to the second closed holder part 162 formed on the second driving lens unit 160. It consists of a second sub-shaft 212 slidably coupled to the second open holder portion 164 to be. Coupling the second sub shaft 212 to the second open holder portion 164 formed in the open direction is to reduce the friction force.

The first position detecting unit includes a first detecting unit 152 fixed to the first driving lens unit 120 and a first hall sensor 150 fixed to the case 100 and having a first magnetic generating magnet. The second position detecting unit includes a second detecting unit 182 fixed to the second driving lens unit 160 and a second hall sensor 180 fixed to the case 100 and having a second magnet for generating magnetism. .

An infrared cut filter 192 is disposed above the image sensor 190.

On the other hand, the controller receives the information of the image sensor 190, and if the image quality of the subject captured by the image sensor 190 is blurred, the first coil 140 and the second coil 170 is finely driven to sharpen the image quality. To perform the focusing operation.

The communication device is provided with an operation button for applying power to the camera device, a shooting button for shooting, and a zoom button for adjusting the zoom. When the operation button is pressed, the controller drives the first coil 140 and the second coil 170 to perform a focusing operation. When the zoom button is pressed, the controller drives the first coil 140 and the second coil 170. Change the zoom factor. When the photographing button is pressed, the controller operates the image sensor 190 to capture an image of the subject.

Hereinafter, the operation of the embodiment having the configuration as described above will be described.

When the user presses an operation button of the communication device, the controller controls the first coil 140 and the second coil 170 to supply fine power for performing the focusing adjustment when the image of the subject captured by the image sensor 190 is not clear. To apply.

When a current is applied to the first coil 140 and the second coil 170, the first driving lens is caused by the magnetic field generated in the first coil 140 and the second coil 170 and the repulsive force of the magnetic flux of the magnet 130. A driving force for raising or lowering the unit 120 and the second driving lens unit 160 in the optical axis direction is generated. By this driving force, the position of the compensation lens group or the displacement lens group is minutely changed to make the image captured by the image sensor 190 clear.

When the user presses the photographing button through the keypad installed in the communication device, the controller drives the image sensor 190 to capture an image of the subject passing through the fixed lens group 110, the compensation lens group, and the displacement lens group. The image sensor 190 converts the captured image into an electrical signal and transmits the converted image to a controller in the main body through a flexible PC.

On the other hand, when the zoom button is pressed through the keypad installed in the communication device, the controller drives the first coil 140 and the second coil 170 to execute a zoom mode for changing the positions of the compensation lens group and the displacement lens group.

When a large current is applied to the first coil 140 and the second coil 170 from the controller, the magnetic field generated in the first coil 140 and the second coil 170 and the repulsive force of the magnetic flux of the magnet 130 are generated. The first driving lens unit 120 and the second driving lens unit 160 are moved to the zoom change position.

The first hall sensor 150 and the second hall sensor 180 detect the positions of the first driving lens unit 120 and the second driving lens unit 160 and transmit them to the controller.

The yoke 132 circulates the magnetic flux of the magnet 130 so that an efficient driving force is generated in the first coil 140 and the second coil 170.

The controller detects the positions of the first driving lens unit 120 and the second driving lens unit 160 from the information of the first hall sensor 150 and the second hall sensor 180, and then continues with the first coil 140. ) And the second coil 170 to supply power to move the first driving lens unit 120 and the second driving lens unit 160 to a position corresponding to a desired zoom magnification.

In this manner, a zoom mode is performed in which the image of the subject captured by the sensor is enlarged through the fixed lens group 110, the compensation lens group, and the displacement lens group.

At this time, if the image captured by the image sensor 190 is not clear, the control unit applies a fine power to perform the focusing adjustment to the first coil 140 and the second coil 170 to perform the focusing operation to sharpen the image. Perform.

In this state, when the user presses the photographing button, the image sensor 190 converts the image captured in the zoom mode into an electrical signal and transmits it to the controller in the main body through the flexible PC.

In this way, zoom photography is performed.

As described above, the compact zoom camera apparatus of the present invention uses a small coil and a magnet to drive two movable lens units, respectively, to form a camera apparatus in which the magnification is adjusted, thereby miniaturizing the size of the camera apparatus. Even a small communication device such as a mobile phone has an effect that can be applied to a zoomable camera device.

In the above, the present invention has been described as an embodiment, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments, and has a general knowledge in the field to which the present invention pertains without departing from the gist of the present invention. Anyone who grows up will be able to make various variations.

Claims (9)

case; A fixed lens group fixed to the case; A first driving lens unit including a compensation lens group in which the fixed lens group and the optical axis are aligned; A first magnet fixed to one side of the first driving lens unit and the case; One of the first driving lens unit and the case is fixed to a side where the first magnet is not fixed, and when power is applied, generates an electromagnetic force for driving the first driving lens unit in the optical axis direction by receiving the magnetic flux of the first magnet. A first coil wound to make; A first position detecting unit fixed to the case to sense a position where the first driving lens unit is moved in the optical axis direction; A second driving lens unit including the fixed lens group and a displacement lens group in which the compensation lens group and the optical axis are aligned; A second magnet fixed to one side of the second driving lens unit and the case; The second magnet is fixed to a side where the second magnet is not fixed among the second driving lens unit and the case, and when electric power is applied, generates an electromagnetic force for driving the second driving lens unit in the optical axis direction by receiving magnetic flux of the second magnet. A second coil wound to make; A second position detecting unit fixed to the case to sense a position where the second driving lens unit is moved in the optical axis direction; An image sensor for capturing an image of a subject passing through the compensation lens group and the displacement lens group; And The first coil is driven to receive the information of the first position detection unit and moves the compensation lens group to a magnification change position, and the first to receive the information of the second position detection unit and moves the displacement lens group to a magnification change position. Driving two coils, and when the image quality of the subject photographed by the image sensor is blurred by receiving the information of the image sensor, finely driving the first coil and the second coil to perform a focusing operation to sharpen the image quality. Including a control unit, The first position detecting unit includes a first hall sensor fixed to one side of the first driving lens unit and the case, and a first hall sensor fixed to the other side and having a first magnetic generating magnet, The second position detecting unit may include a second hall sensor fixed to one side of the second driving lens unit and the case, and a second hall sensor fixed to the other side and having a second magnet for generating magnetism. Zoom camera device. The compact zoom camera device of claim 1, wherein the first magnet and the second magnet are integrally formed. The method according to claim 1, wherein the case, And a yoke for focusing the magnetic flux of the first magnet and the second magnet to the vicinity of the first coil and the second coil. The method of claim 1, wherein the first driving lens unit, Small zoom camera device, characterized in that guided to drive in the optical axis direction by a first shaft fixed to the case. The method of claim 4, wherein the first shaft is a first main shaft slidably coupled to a first closed holder portion formed in the first driving lens portion, and a first open type formed in the first driving lens portion Small zoom camera device, characterized in that consisting of a first sub-shaft slidably coupled to the holder. The method of claim 1, wherein the second driving lens unit, Small zoom camera device, characterized in that guided to drive in the optical axis direction by a second shaft fixed to the case. The method of claim 6, wherein the second shaft is a second main shaft slidably coupled to a second closed holder portion formed in the second driving lens portion, and a second open type formed in the second driving lens portion Small zoom camera device, characterized in that consisting of a second sub-shaft slidably coupled to the holder. delete delete

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