KR100795210B1 - A small zoom camera device - Google Patents

Abstract

A compact zoom camera apparatus is disclosed. Such a camera device includes a barrel having a first female threaded portion and a second female threaded portion formed on an inner circumferential surface thereof, a first lens holder having a first male threaded portion fixed to a second lens group and coupled to the first female threaded portion to be screw-rotated; A second lens holder having a second male screw portion coupled to the second female screw portion and screwed to the second female screw portion, and a first magnet fixed to the first lens holder and having a plurality of polarities divided radially in the optical axis; A first electronic part fixed to the second magnet to generate a magnetic force for rotating the first magnet, a second magnet fixed to the second lens holder and divided into several polarities in the radial direction of the optical axis, and fixed to the barrel and mounted to the second magnet. It has a second electromagnetic field for generating a magnetic force for rotating. Such a camera apparatus drives the lens holder in a rotational manner, thereby preventing failure and reducing power consumption.

Equipment, Screw, Rotating, Coil, Magnet

Description

Mini Zoom Camera Unit {A SMALL ZOOM CAMERA DEVICE}

1 is an exploded perspective view of a camera device implemented according to an embodiment of the present invention;

2 is an exploded perspective view of the electromagnetic unit illustrated in FIG. 1;

3 is an exploded perspective view illustrating the first and second lens holders illustrated in FIG. 1;

4 is a cross-sectional view of the coupled state of the camera device shown in FIG.

<Explanation of symbols for main parts of drawing>

100: barrel 102: first female threaded portion

104: 2nd female thread part 110: 1st lens group

120: first electronic base 140: second lens group

150: first magnet 160: first lens holder

162: first male thread portion 170: third lens group

180: second magnet 190: second lens holder

200: second electronic donation 220: image sensor

230: base 300: York

310: first coil 320: second coil

330: first pole piece 332: second pole piece

340: third pole piece 342: fourth pole piece

The present invention relates to a small zoom camera device, in particular to miniaturize the size to be used in a communication device such as a mobile phone or a small photographing device, and to prevent failure and reduce power consumption by driving the lens holder in a rotating manner will be.

In recent years, as mobile phones equipped with small cameras have become more common, users can conveniently capture images of a subject without having a digital camera, so that users own a mobile phone equipped with a small camera comparable to that of a digital camera. Was done.

However, in order to implement the performance of the existing digital camera, a small camera for a portable terminal has technical limitations.

In order to improve the quality of the image captured by capturing the image of the subject, the focal length between the lens module where the image of the subject is projected and the point where the image is captured must be exactly matched. Since all the subjects cannot be imaged with clear image quality, the point where the image is captured and the focal length formed by the lens module should be flexible.

However, the conventional general camera or digital camera adopts a camera device of a method of driving the barrel in which the lens module is coupled with complicated gears, so that its volume is large and its length in the optical axis direction becomes long.

Therefore, such a large size camera device cannot be applied as it is to a portable terminal requiring miniaturization, and a new type of miniaturized camera device is needed.

Recently, a so-called VCM compact camera apparatus has been disclosed in which a lens is directly driven in an optical axis direction by using a coil and a magnet, whereby a focus and magnification are adjusted.

In the VCM method, a lens holder with a coil or magnet is directly driven in an optical axis direction by using an electromagnetic force generated between a current flowing coil and a magnetic flux of a magnet.

Therefore, the structure was simple and it was possible to implement a compact camera device.

However, such a VCM camera device has some problems as follows.

First, in order to guide the lens holder to be precisely driven in the optical axis direction, there is a structure in which the shaft hole is formed in the lens holder and the guide shaft is fixed to the fixing part so that the lens holder is guided in the optical axis direction. Since friction occurs between the shafts, there was a problem that the driving speed of the lens holder is lowered.

Secondly, in order to improve the first problem, there is a structure in which the lens holder is supported by a thin plate spring fixed to the fixing part. In this method, the plate spring is deformed when the camera device is subjected to an impact, thereby preventing the camera device from driving normally. There was a problem.

Third, power must be continuously supplied to the coil in a state where the lens holder is driven to perform focusing or zoom change, and thus the lens holder is maintained in a supported state, thereby increasing power loss. A communication device driven by a battery, such as a mobile phone, has a problem inconvenient for the user because it requires frequent replacement of the battery when consuming too much power from the camera device.

Accordingly, an object of the present invention is to solve the above problems, by driving the lens holder in a rotational manner, to prevent failure and reduce power consumption.

The present invention for achieving the above object is a base;

An image sensor fixed to the base and photographing a subject;

A barrel fixed to the base and having a first female screw portion and a second female screw portion formed on an inner circumferential surface thereof;

A first lens group through which an image of the subject is passed and fixed to the barrel;

A second lens group in which the first lens group and the optical axis are aligned;

A first lens holder fixing the second lens group and having a first male screw portion coupled to the first female screw portion to be screwed;

A third lens group in which optical axes are aligned with the first lens group and the second lens group;

A second lens holder fixing the third lens group and having a second male screw portion coupled to the second female screw portion to be screwed;

A first magnet which is fixed to the first lens holder and whose polarity is divided into several radially of the optical axis;

A first electronic part fixed to the barrel and generating a magnetic force for rotating the first magnet;

A second magnet which is fixed to the second lens holder and whose polarity is divided into several radially of the optical axis;

A second electronic part fixed to the barrel and generating a magnetic force for rotating the second magnet; And

Receives focusing error and magnification information of the captured image from the image sensor, drives the first electronic unit and the second electronic unit to drive the first lens holder and the second lens holder to capture the image on the image sensor It provides a compact zoom camera device comprising a; control unit for performing the focusing adjustment and the zoom magnification adjustment of the image.

The first electronic base and the second electronic base,

A yoke coupled to an outer side surface of the barrel and provided with annular space portions up and down in the optical axis direction;

First and second coils respectively inserted into the respective space parts and wound in an annular shape to receive power from the controller;

A plurality of first pole pieces and second pole pieces divided to have a polarity corresponding to each of the divided polarities of the first magnet or the second magnet when current flows in the first coil; And

It includes a plurality of third pole pieces and fourth pole pieces divided to have a polarity corresponding to each of the divided polarity of the first magnet or the second magnet when the current flows in the second coil.

The controller controls the focusing of the image of the subject captured by the image sensor by driving the first electronic unit or the second electronic unit to drive the first lens holder or the second lens holder finely. do.

The controller may be configured to drive the first electronic unit or the second electronic unit based on a previously input movement ratio of the second lens group and the third lens group, so that the first lens holder or the first lens may be driven. By largely driving the two lens holders, zooming of the image of the subject captured by the image sensor is performed.

The small zoom camera device includes a sensor for detecting a position of the first magnet and the first magnet and transmitting the detected position to the controller.

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.

1 is an exploded perspective view of a camera device implemented according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the electromagnetic portion shown in FIG. 3 is an exploded perspective view of the first and second lens holders shown in FIG. 1, and FIG. 4 is a cross-sectional view of the coupled state of the camera apparatus shown in FIG.

The camera device includes a base 230; An image sensor 220 fixed to the base 230 and photographing a subject; A barrel 100 fixed to the base 230 and having a first female threaded portion 102 and a second female threaded portion 104 formed on an inner circumferential surface thereof; An image of the subject passing through the first lens group 110 fixed to the barrel 100; A second lens group 140 in which the first lens group 110 and the optical axis are aligned; A first lens holder 160 fixed to the second lens group 140 and having a first male screw portion 162 coupled to the first female screw portion 102 and screwed; A third lens group 170 in which optical axes are aligned with the first lens group 110 and the second lens group 140; A second lens holder 190 fixed to the third lens group 170 and having a second male screw portion coupled to the second female screw portion 104 to be screwed; A first magnet (150) fixed to the first lens holder (160), the polarity of which is divided into several radially of the optical axis; A first electronic part 120 fixed to the barrel 100 to generate a magnetic force for rotating the first magnet 150; A second magnet (180) fixed to the second lens holder (190), the polarity of which is divided into several in the radial direction of the optical axis; A second electronic part 200 fixed to the barrel 100 to generate a magnetic force for rotating the second magnet 180; And receiving focusing error and magnification information of the captured image from the image sensor 220 and driving the first electronic unit 120 and the second electronic unit 200 to drive the first lens holder 160 and the second. The lens holder 190 is driven to control the focusing and zoom magnification of the image captured by the image sensor 220.

The first electronic part 120 and the second electronic part 200 have the same configuration. These are yoke 300 coupled to the outer surface of the barrel 100, the annular space portion is provided in the optical axis direction up and down respectively; A first coil 310 and a second coil 320 respectively inserted into the respective space parts and wound in an annular shape to receive power from the controller; When the current flows in the first coil 310, the plurality of first pole pieces 330 and the plurality of first pole pieces divided to have polarities corresponding to the divided polarities of the first magnets 150 or the second magnets 180, respectively. Two pole pieces 332; And a plurality of third pole pieces 340 divided to have a polarity corresponding to each of the divided polarities of the first magnet 150 or the second magnet 180 when current flows in the second coil 320; The fourth pole piece 342 is formed.

For the detailed configuration and operation of the second electronic base 200 and the second electronic base 200, Korean Patent Application No. 1999-23952 (Stepping Motor), Korean Patent Application No. 2000-52512 (Step Motor Control Method ), Korean Utility Model Registration Application No. 2000-27071 (step motor) describes the configuration and driving principle in detail. The driving principle of the second electronic part 200 and the second electronic part 200 is similar to the driving principle of these inventions.

The controller controls the first electronics 120 or the second electronics 200 to drive the first lens holder 160 or the second lens holder 190 finely, thereby capturing the image on the image sensor 220. Focusing adjustment is performed on the image of the subject.

The controller may drive the first electronic unit 120 or the second electronic unit 200 based on the movement ratio of the second lens group 140 and the movement ratio of the third lens group 170 previously input. By largely driving the first lens holder 160 or the second lens holder 190, zoom adjustment is performed on an image of a subject captured by the image sensor 220.

The compact zoom camera device includes a sensor for detecting a position of the first magnet 150 and the first magnet 150 and transmitting the detected position to the controller. Hall sensors, optical sensors, etc. are suitable as such sensors. Since the sensor has a variety of shapes and installation locations, the illustration in the drawings is omitted, but it is safe to install in the barrel (100).

Hereinafter, the operation of the camera device having the above configuration will be described.

When the first lens holder 160 and the second lens holder 190 do not rotate, the distance between the first lens group 110, the second lens group 140, and the third lens group 170 is determined by the magnification of general photography. Keep it.

If a focusing error occurs in an image captured by the image sensor 220 through the first lens group 110, the second lens group 140, and the third lens group 170, the controller may include the first electronic component 120. Or by slightly driving the second electronic unit 200 to finely drive the first lens holder 160 or the second lens holder 190, thereby adjusting the focusing adjustment of the image of the subject captured by the image sensor 220. Conduct.

When the user instructs the zoom adjustment through the control unit, the control unit may control the first electronic base 120 and the second electronic device 120 based on the movement ratio of the second lens group 140 and the movement ratio of the third lens group 170 previously input. The second electronic component 200 is driven.

When the first electronic part 120 and the second electronic part 200 are driven, the first pole piece 330, the second pole piece, the third pole piece 340, and the fourth pole piece 342 are the first magnets. 150 and the second magnet 180 is rotated. Accordingly, the first male thread part 162 and the second male thread part of the first lens holder 160 and the second lens holder 190 are the first female thread part 102 and the second female thread part 104 of the barrel 100. The first lens holder 160 and the second lens holder 190 are largely moved in the optical axis direction by rotating from. Accordingly, the distance between the first lens group 110, the second lens group 140, the third lens group 170, and the image sensor is changed to adjust zoom of an image of a subject captured by the image sensor.

When the focusing adjustment or the zoom adjustment is made as described above, even if the power supplied to the first electronic part 120 or the second electronic part 200 is cut off, the first lens holder 160 and the first The position of the two lens holder 190 is hardly changed. Thus, power can be saved.

In addition, even when an impact is applied to the camera device from the outside, the first lens holder 160 and the second lens holder 190 fixed in position by the screw coupling relationship and other parts for driving them are not affected by the impact.

While specific embodiments of the present invention have been described and illustrated above, it will be apparent that the present invention may be embodied in various modifications by those skilled in the art. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

As described above, the present invention has the effect of preventing the failure and reducing the power consumption by driving the lens holder in a rotational manner.

Claims (5)

Base; An image sensor fixed to the base and photographing a subject; A barrel fixed to the base and having a first female screw portion and a second female screw portion formed on an inner circumferential surface thereof; A first lens group through which an image of the subject is passed and fixed to the barrel; A second lens group in which the first lens group and the optical axis are aligned; A first lens holder fixing the second lens group and having a first male screw portion coupled to the first female screw portion to be screwed; A third lens group in which optical axes are aligned with the first lens group and the second lens group; A second lens holder fixing the third lens group and having a second male screw portion coupled to the second female screw portion to be screwed; A first magnet which is fixed to the first lens holder and whose polarity is divided into several radially of the optical axis; A first electronic part fixed to the barrel and generating a magnetic force for rotating the first magnet; A second magnet which is fixed to the second lens holder and whose polarity is divided into several radially of the optical axis; A second electronic part fixed to the barrel and generating a magnetic force for rotating the second magnet; And Receives focusing error and magnification information of the captured image from the image sensor, drives the first electronic unit and the second electronic unit to drive the first lens holder and the second lens holder to capture the image on the image sensor And a control unit which performs focusing adjustment and zoom magnification adjustment of the image to be made. The first electronic base and the second electronic base, A yoke coupled to an outer side surface of the barrel and provided with annular space portions up and down in the optical axis direction; First and second coils respectively inserted into the respective space parts and wound in an annular shape to receive power from the controller; A plurality of first pole pieces and second pole pieces divided to have a polarity corresponding to each of the divided polarities of the first magnet or the second magnet when current flows in the first coil; And A small zoom including a plurality of third pole pieces and a fourth pole piece divided to have a polarity corresponding to each of the divided polarities of the first magnet or the second magnet when current flows in the second coil Camera device. delete The image of the subject captured by the image sensor of claim 1, wherein the controller is configured to slightly drive the first electronic part or the second electronic part to drive the first lens holder or the second lens holder finely. Small zoom camera device characterized in that for performing the focusing adjustment for. The display apparatus of claim 1, wherein the controller is further configured to drive the first electronic unit or the second electronic unit based on a previously input movement ratio of the second lens group and the third lens group. A zoom camera apparatus, characterized in that zooming is performed on an image of a subject captured by the image sensor by driving a lens holder or the second lens holder largely. The method of claim 1, wherein the small zoom camera device, the small zoom camera device characterized in that the sensor for detecting the position of the first magnet and the first magnet and transmits to the controller.

Images