WO2010117105A1

WO2010117105A1 - Filter change assembly for camera module which uses electromagnetic rotating device, and operating method thereof

Info

Publication number: WO2010117105A1
Application number: PCT/KR2009/002432
Authority: WO
Inventors: 이영수
Original assignee: (주)씨프로
Priority date: 2009-04-07
Filing date: 2009-05-08
Publication date: 2010-10-14
Also published as: KR20100111479A; KR100996470B1

Abstract

The present invention relates to a filter change assembly for camera module which uses an electromagnetic rotating device, and more specifically to a filter change assembly which: excludes an unnecessary operation from the filter change assembly by driving an electromagnetic rotating device after detecting the environment through a camera module; and does not veil a screen by shortening an operation time thereof. The filter change assembly disclosed in the invention comprises: an assembly base that supports an electromagnet rotation inducing member; the electromagnetic rotation inducing member that forms an electronic field for rotating the electromagnetic rotating device; the electromagnetic rotating device that rotates by an electromagnetic force when electricity flows into the electromagnet rotation inducing member to form the electric field; a plate that comprises a hollow portion for changing the rotation into linear motion of the electromagnetic rotating device and transferring the light passing through a lens to a CCD; and a filter holder slide that has a glass filter and an infrared ray removing filter inserted into an internal hollow portion thereof and performs linear motion through the guidance of the plate.

Description

[Correction according to Rule 26.07.2009] Filter change assembly for camera module using electromagnet rotating device and its operation method

The present invention relates to a filter change assembly for a camera module using an electromagnet rotating device, and more particularly, after the environment is recognized by the camera module, the electromagnet rotating device is driven to exclude unnecessary operation and reduce the operation time to cover the screen. It relates to a filter change assembly for a camera module using an electromagnet rotating device.

The present applicant has proposed a technology for automatically converting the daytime filter and the nighttime filter according to the ambient light in the application No. 10-2002-0026385 filed on May 14, 2002 (filter change assembly for the camera module). , Application No. 10-2005-0036710 filed on May 2, 2005 (filter change assembly for the camera module and its operating method) has filed an improved invention. However, the filter change assembly of the application No. 10-2002-0026385 filed on May 14, 2002 (filter change assembly for the camera module) is less efficient in operation due to the complexity of the gear bite, such as rack gears, When malfunction occurs in the gear bite, there is a problem of dropping the overall performance of the camera. In application No. 10-2005-0036710 filed May 2, 2005 (filter change assembly for camera module and its operation method), when the solenoid is used, the structure of the filter is slid by sliding the holder of the filter by the flipping method, Although the element could be removed, the power was supplied once every 0.1 seconds to operate, and thus the acceleration and deceleration could not be given, and the rotation angle could not be arbitrarily made.

Therefore, the present applicant is to give the acceleration and deceleration of the speed using a stepping motor and to control the rotation angle using a dedicated drive, the applicant is March 16, 2006 Application No. 10-2006-0024189 (for the camera module using a stepping motor The filter change assembly and its operation method were filed and registered on January 23, 2008 (Registration No. 10-0799281). However, using a stepping motor consumes unnecessary current on the first run because of the problem of having to go to HOME the first time it runs on the control. In addition, since the stepping motor rotates slowly, there is a problem of covering the screen by passing the mechanism of the filter change in the middle of driving.

In order to solve the above problems, the present invention eliminates unnecessary operation by driving the electromagnet rotating apparatus after the environment is recognized by the camera module, and the current consumption when driving the electromagnet rotating apparatus shortens the power-on time. It is an object of the present invention to provide a filter change assembly for a camera module using an electromagnet rotating device that does not obscure a screen by shortening an operation time, and an operation method thereof.

In order to achieve the above object, the present invention provides a filter change assembly for a camera module using an electromagnet rotating apparatus as a first aspect, comprising: an assembly base for supporting an electromagnet rotating conductor; An electromagnet rotating conductor forming an electric field for rotating the electromagnet rotating device; An electromagnet rotating device that rotates by electromagnetic force when electricity flows through the electromagnet rotating conductor; A plate having a hollow part for changing the rotational motion of the electromagnet rotating device into a linear motion and for transmitting the light passing through the lens to the CCD; A filter change assembly for a camera module using an electromagnet rotating device is provided in which the hollow part has a glass filter and an infrared ray elimination filter inserted therein and includes a filter holder slide which linearly moves by the guide of the plate.

In a second aspect, in the method of operating a filter change assembly for a camera module using an electromagnet rotating device, a +,-current is sent to a cable to move the +,-current to the left and right electromagnet coils, and the movement of the current causes the A first step in which an S pole is formed at the left electromagnet coil and an N pole is formed at the right electromagnet coil, and the electromagnet rotates clockwise around the electromagnet axis; A second step in which the clockwise rotational movement of the electromagnet shaft is changed into a linear motion by a filter holder slide to move the filter holder slide from left to right; Stopping the power supply after stopping the movement of the filter holder slide at a suitable position; and maintaining the stopped direction in response to the electromagnet fixture by the magnetic force of the electromagnet; -, + Current is sent to the left and right electromagnet coils by the cable,-, + current is moved and the N pole is formed on the left electromagnet coil and the S pole is formed on the right electromagnet coil by the movement of the current. 4 steps of rotating in the counterclockwise direction around the electromagnet axis; A fifth step in which the counterclockwise rotational movement of the electromagnet shaft is changed into a linear motion by the filter holder slide to move the filter holder slide from right to left; When the movement of the filter holder slide stops at a suitable position to stop the power supply and the power supply is stopped by the magnetic force of the electromagnet by the magnetic force of the electromagnet is characterized in that it comprises a sixth step of continuously maintaining the stopped direction A method of operating a filter change assembly for a camera module using an electromagnet rotating device is provided.

The number of electronic parts for controlling the electromagnet rotating device can be significantly reduced, and the simple structure has an effect of driving the electromagnet rotating device by applying instantaneous power.

The current consumption when driving the electromagnet rotating device has the effect of eliminating the problem of consuming unnecessary current during the initial driving by shortening the power-on time, and shortening the operating time so that the screen is not blocked by the mechanism of the filter change in the middle of driving. There is.

1 is a filter changer for a camera module using the electromagnet rotating apparatus of the present invention

An exploded perspective view of the assembly.

2 is a filter change assembly for a camera module using an electromagnet rotating device.

It is a system diagram of the electromagnet rotating conductor 200.

3, 4, and 5 show that the filter holder slide 500 is converted to linear motion by the rotation of the electromagnet rotating device 300, and moves from left to right to replace the filter.

6, 7 and 8 illustrate that the filter holder slide 500 is converted into a linear motion by the rotation of the electromagnet rotating device 300 to move from right to left to replace the filter.

9 illustrates a method of operating a filter change assembly for a camera module using an electromagnet rotating apparatus.

100: assembly base 110: electromagnet rotating conductor support

200: electromagnet rotating conductor 210: electromagnet coil

220: electromagnet fixing body 230: electromagnet coil support

240: PCB 250: connector

300: electromagnet rotating device 310: electromagnet shaft

311: filter holder slide moving part 312: filter holder slide fixing hole coupling protrusion

320: electromagnet 400: plate

410: filter holder slide guide 500: filter holder slide

510: Glass Filter 520: IR CUT FILTER

530: filter holder slide fixing hole 600: filter base

700: CCD correction filter

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the embodiment of the present invention.

1 is an exploded perspective view of a filter change assembly for a camera module using the electromagnet rotating apparatus of the present invention. The filter change assembly for the camera module using the electromagnet rotating device is positioned between the lens and the CCD in the camera and serves to replace the glass filter and the infrared ray removing filter. The CCD converts light passing through the lens into an electrical analog signal.

As shown in FIG. 1, the filter change assembly for the camera module using the electromagnet rotating device includes an assembly base 100, an electromagnet rotating conductor 200, an electromagnet rotating device 300, a plate 400, and a filter holder slide 500. ), Filter base 600 and filter 700. The assembly base 100 has a rectangular hollow portion 120 is formed in the center, the electromagnet rotating conductor support 110 for supporting the electromagnet rotating conductor 200 is formed on one side.

The electromagnet rotating conductor 200 forms an electric field for rotating the electromagnet rotating device (300). The electromagnet rotating conductor 200 is an electromagnet coil 210, an electromagnet fixing body 220. Electromagnetic coil support 230, the PCB 240, the connector 250 is composed of. The electromagnet coil 210 forms an electric field when electricity flows. The electromagnet fixing body 220 is fixed to the electromagnet rotating apparatus 300 by being in close contact with the electromagnet rotating apparatus 300 when the electric field disappears because electricity does not flow. The electromagnet coil support 230 is wound around the electromagnet coil 210 to support the electromagnet coil. The PCB 240 is a wiring for electricity to flow through the electromagnet coil. The connector 250 receives a voltage from the microcomputer.

The electromagnet rotating device 300 is left and right along the filter holder slide 500 along the filter holder slide guide 410 formed on the upper surface of the plate 400 when electricity flows through the electromagnet rotating conductor 200 to form an electric field. Move it. The electromagnet rotating device 300 is composed of an electromagnet shaft 310, an electromagnet 320. The electromagnet shaft 310 has a cylindrical body and a filter holder slide moving part 311 is elongated on a portion of the cylindrical side, and the filter holder slide 500 is formed on one side of the filter holder slide moving part 311. The filter holder slide fixing hole coupling protrusion 312 is coupled to the filter holder slide fixing hole 530 formed at one side to move the filter holder slide 500 from side to side. The lower surface of the body of the electromagnet shaft 210 is coupled to the hollow portion 321 is formed in the center of the electromagnet 320 is a projection for making the electromagnet shaft 310 integral with the electromagnet 320 Formed. The electromagnet 310 has a cylindrical shape and a hollow portion 321 is formed at the center thereof. When electricity flows through the electromagnet rotating conductor 200, an electric field is formed and rotates according to the electric field.

The plate 400 is in the form of a rectangular flat plate, the filter holder slide guide 410 is formed on the upper portion of the plate 400 for guiding when the filter holder slide 500 is moved left and right. In the center of the plate 400, a hollow part 420 is formed to correspond to the glass filter 510 and the IR cut filter 520 of the filter holder slide 500.

The filter holder slide 500 is in the form of a rectangular plate, the glass filter 510 is inserted into the left hollow portion, the infrared filter 520 is inserted into the right hollow portion. One side of the filter holder slide 500 is formed with a filter holder slide fixing hole 530 for coupling the filter holder slide fixing hole coupling protrusion 312. The filter holder slide 500 linearly moves left and right by the plate 400 according to the rotational movement of the electromagnet rotating device 300. The glass filter 510 and the infrared ray elimination filter 520 are alternately replaced by the linear motion. The glass filter 510 transmits infrared light to the CCD when photographing at night with AR coating glass so that a bright screen can be seen. The infrared filter 520 blocks the infrared light coming through the lens during the day to allow color reproduction.

The filter base supports the CCD correction filter 700. The filter base 700 has a rectangular hollow portion 610 for supporting the CCD correction filter 700 in the center of the rectangular body, the electromagnet rotating conductor support 110 on one side of the rectangular body. Corrugated cover 620 is formed to cover the electromagnet rotating device 300 and the electromagnet rotating inductor 200 in correspondence with the cover), and the other side of the body of the quadrangle is formed to protrude in an arc shape.

The CCD correction filter 700 corrects the CCD mounted on the camera module.

2 is a system diagram of an electromagnet rotating inductor 200 of a filter change assembly for a camera module using an electromagnet rotating device.

A power supply method for the electromagnet rotating conductor 200 will be described with reference to FIG. 2. The microcomputer (ATiny15L: not shown) receives an analog AGC signal necessary to exchange a filter from a DSP (Digital Signal Processor) (not shown). "Driv +" from the micom (not shown) to flow the input analog AGC signal into the electromagnet rotating conductor 200 to drive the electromagnet rotating device 300 by using a comparator in the microcomputer. Produces the output of both terminals. Normally, the output of both terminals should be at GND. When the analog AGC signal input from the DSP becomes 2.5V or more, a constant voltage is applied to the “driving +” terminal of the two terminals from the microcomputer for a short time by applying a constant voltage to the IR removal filter 520 from the left. Moving to the right to replace the glass filter 510.

When the analog AGC signal input from the DSP is 2.5V or less, a reverse voltage is applied to the “driving” terminal of the two terminals from the microcomputer for a short time to turn the glass filter 510 on. Move left to replace the infrared filter 520.

In the power supply, as shown in FIG. 2, when the power of ① is applied, current flows through the PCB 240 so that the left side of the electromagnet 320 has a positive pole and the right side has a negative pole, and the left electromagnet coil 210 has an N pole. Is formed, and the S pole is formed on the right electromagnet coil (210). The magnetic field thus formed acts on the electromagnet 320 in the center to exert the same poles and to attach the other poles to the magnetic force. After the plate 400 is moved in one direction and then the power is cut off, the electromagnet fixing body 220 made of pure iron embedded in the center of the electromagnet coil 210 is attached to the electromagnet 320 of the electromagnet 320. The movement is fixed.

On the contrary, when the power source of ② is inserted, an S pole is formed in the left electromagnet coil 210, and an N pole is formed in the right electromagnet coil 210. The magnetic force acting on the electromagnet 320 by the magnetic field formed as opposed to the previous action is reversed so that the electromagnet 300 in the center rotates in the opposite direction. After moving to another direction after the power is cut off again, the direction of the electromagnet 320 is fixed under the influence of the electromagnet fixing body 220 made of pure iron embedded in the center of the electromagnet coil 210.

As shown in FIG. 3, + and − currents are sent to the cable CABEL to move the + and − currents from the PCB 240 to the left and right electromagnet coils 210, respectively, so that the left electromagnet coil 210 is moved. The S pole is formed on the right side, and the N pole is formed on the right electromagnet coil 210. As a result, the N pole and the S pole in the center is affected by the electromagnet 320 is divided up and down so that the electromagnet 320 starts to rotate clockwise around the electromagnet axis (310).

Referring to FIG. 4, the electromagnet 320 rotates about the electromagnet axis 310 due to a property in which the same poles are formed in the direction in which the electromagnet coil 210 and the electromagnet 320 face each other and push each other. As a result, the clockwise rotation of the electromagnet shaft 310 is changed into a linear motion by the filter holder slide 500 connected to the electromagnet shaft 310 and inserted into the filter holder slide 500. The glass filter 510 and the infrared ray elimination filter 520 are simultaneously moved from left to right.

Referring to Figure 5, the electromagnet 320 is close to the other poles of the magnet is strong enough to stick to the filter is moved to the rightmost, the continuous movement is stopped on the appropriate position to stop the jaw. Then, when the power supply is stopped, the magnetic force of the electromagnet 320 keeps the stopped direction in response to the electromagnet fixing body 220 formed of pure iron wrapped in the center of the electromagnet coil 210.

Referring to FIG. 6, when moving in the opposite direction to the above direction, the power supply is reversed from the beginning to reverse the electromagnetic force acting on the electromagnet 320 and the electromagnet coil 210. That is,-, + current is sent to the cable (CABEL) to the electromagnet coil 210 of the left and right from the PCB 240,-, + current is moved to the left electromagnet coil 210, the N pole, The S pole is formed on the right electromagnet coil 210. As a result, the N-pole and the S-pole are divided into the upper and lower portions in the center so that the electromagnet 320 starts to rotate counterclockwise about the electromagnet axis 310.

Referring to FIG. 7, the electromagnet 320 rotates about the electromagnet axis 310 due to the property of pushing the same while the same poles are formed in the direction in which the electromagnet coil 210 and the electromagnet 320 face each other. As a result, the counterclockwise rotation of the electromagnet shaft 310 is changed to a linear motion by the filter holder slide 500 connected to the electromagnet shaft 310 to the filter holder slide 500. The inserted glass filter 510 and the infrared ray removing filter 520 simultaneously move from right to left.

Looking at Figure 8, the electromagnet 320 is close to the other poles of the magnet is strong enough to attach the filter is moved to the left most, and the continuous movement is stopped on the appropriate position by stopping the stop. Then, when the power supply is stopped, the magnetic force of the electromagnet 320 keeps the stopped direction in response to the electromagnet fixing body 220 formed of pure iron wrapped in the center of the electromagnet coil 210.

As shown in Figure 9, the filter change assembly operation method for the camera module using the electromagnet rotating device, the + and-current to the cable (CABEL) by sending the electromagnet coil 210 of the left and right in the PCB 240 And +,-one step (S110) to move the current, respectively; A second step (S120) in which an S pole is formed in the left electromagnet coil 210 and an N pole is formed in the right electromagnet coil 210 by the movement of the current; The electromagnet 320 is the electromagnet 310 by affecting the electromagnet 320 in which the N pole and the S pole are divided up and down in the center under the influence of the N pole formed on the electromagnet coil 210 and the S pole. Three steps (S130) to rotate clockwise around the; The clockwise rotation of the electromagnet shaft 310 is changed into a linear motion by the filter holder slide 500 connected to the electromagnet shaft 310 and inserted into the filter holder slide 500. Step 4 and the infrared filter 520 is simultaneously moved from left to right (S140); A step 5 of stopping the movement of the filter holder slide 500 at a suitable position by stopping the jaw (S150); When the power supply is stopped 6 step (S160) to continuously maintain the stopped direction in response to the electromagnet fixing body 220 made of pure iron wrapped in the central portion of the electromagnet coil 210 by the magnetic force of the electromagnet 320 Wow; A seven step (S170) in which a + current is sent to a cable CABEL, and the + current is moved from the PCB 240 to the electromagnet coil 210 on the left and right sides, respectively; 8 steps (S120) in which the N pole is formed in the left electromagnet coil 210 and the S pole is formed in the right electromagnet coil 210 by the movement of the current; The electromagnet 320 is the electromagnet 310 by affecting the electromagnet 320 in which the N pole and the S pole are divided up and down in the center under the influence of the N pole formed on the electromagnet coil 210 and the S pole. 9 steps (S190) to rotate in a counterclockwise direction around the; Counterclockwise rotation of the electromagnet shaft 310 is changed into a linear motion by the filter holder slide 500 connected to the electromagnet shaft 310 and inserted into the filter holder slide 500. 510 and the infrared ray elimination filter 520 simultaneously move from right to left in step 10 (S200); An eleventh step S210 of stopping the movement of the filter holder slide 500 at a suitable position; Stopping the power supply 12 reacts with the electromagnet fixing body 220 made of pure iron wrapped in the central portion of the electromagnet coil 210 by the magnetic force of the electromagnet 320 to continuously maintain the stopped direction (S220) It consists of. Preferably the order of movement from left to right and later from right to left may be reversed.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. You will understand that. Accordingly, the embodiments described above are exemplary in all respects and not restrictive.

In the present invention, the filter change assembly for a camera module using an electromagnet rotating device, Assembly base for supporting the electromagnet rotating inductor; An electromagnet rotating conductor forming an electric field for rotating the electromagnet rotating device; An electromagnet rotating device that rotates by electromagnetic force when electricity flows through the electromagnet rotating conductor; A plate having a hollow part for changing the rotational motion of the electromagnet rotating device into a linear motion and for transmitting the light passing through the lens to the CCD; A filter change assembly for a camera module using an electromagnet rotating device is provided in which the hollow part has a glass filter and an infrared ray elimination filter inserted therein and includes a filter holder slide which linearly moves by the guide of the plate.

Since the intent of the patent system is to promote technology development and ultimately contribute to national industrial development through the protection, promotion and use of the invention, the invention must be industrially feasible. The filter change assembly for a camera module is an invention for an object, and the method for operating a filter change assembly for a camera module using an electromagnet rotating device is a method invention, and thus industrial applicability is recognized.

Claims

In the filter change assembly operation method for a camera module using an electromagnet rotating device,

+,-Current is sent to the left and right electromagnet coils by the cable, and the current moves to the left and right electromagnet coils. The S pole is formed on the left electromagnet coil and the N pole is formed on the right electromagnet coil by the movement of the current. Rotating in a clockwise direction with respect to the first step;

A second step in which the clockwise rotational movement of the electromagnet shaft is changed into a linear motion by a filter holder slide to move the filter holder slide from left to right;

Stopping the power supply after stopping the movement of the filter holder slide at a suitable position; and maintaining the stopped direction in response to the electromagnet fixture by the magnetic force of the electromagnet;

-, + Current is sent to the left and right electromagnet coils by the cable,-, + current is moved and the N pole is formed on the left electromagnet coil and the S pole is formed on the right electromagnet coil by the movement of the current. 4 steps of rotating in the counterclockwise direction around the electromagnet axis;

A fifth step in which the counterclockwise rotational movement of the electromagnet shaft is changed into a linear motion by the filter holder slide to move the filter holder slide from right to left;

When the movement of the filter holder slide stops at a suitable position to stop the power supply and the power supply is stopped by the magnetic force of the electromagnet by the magnetic force of the electromagnet is characterized in that it comprises a sixth step of continuously maintaining the stopped direction Filter change assembly operation method for camera module using electromagnet rotating device.
In the filter change assembly operation method for a camera module using an electromagnet rotating device,

-, + Current is sent to the left and right electromagnet coils by the cable,-, + current is moved and the N pole is formed on the left electromagnet coil and the S pole is formed on the right electromagnet coil by the movement of the current. Step 1-1 to rotate in the counterclockwise direction around the electromagnet axis;

A step 2-1 in which the counterclockwise rotation of the electromagnet shaft is changed into a linear motion by the filter holder slide so that the filter holder slide moves from right to left;

Step 3-1 of stopping the movement of the filter holder slide at a suitable position and stopping the power supply and continuously maintaining the stopped direction in response to the electromagnet fixing body by the magnetic force of the electromagnet;

+,-Current is sent to the left and right electromagnet coils by the cable, and the current moves to the left and right electromagnet coils. The S pole is formed on the left electromagnet coil and the N pole is formed on the right electromagnet coil by the movement of the current. Step 4-1 to rotate clockwise around the;

Step 5-1 in which the clockwise rotational movement of the electromagnet shaft is changed to a linear motion by a filter holder slide so that the filter holder slide is moved from left to right;

And stopping the power supply after the movement of the filter holder slide stops at an appropriate position, thereby maintaining the stopped direction in response to the electromagnet fixing body by the magnetic force of the electromagnet. Filter change assembly operation method for a camera module using an electromagnet rotating device.
The method according to claim 1 or 2,

The filter holder slide is a filter change assembly operation method for a camera module using an electromagnet rotating device, characterized in that it comprises a glass filter and an infrared ray removing filter.
In the filter change assembly for a camera module using an electromagnet rotating device,

An assembly base for supporting the electromagnet rotating conductor;

An electromagnet rotating conductor forming an electric field for rotating the electromagnet rotating device;

An electromagnet rotating device that rotates by electromagnetic force when electricity flows through the electromagnet rotating conductor;

A plate having a hollow part for changing the rotational motion of the electromagnet rotating device into a linear motion and for transmitting the light passing through the lens to the CCD;

A filter change assembly for a camera module using an electromagnet rotating apparatus, characterized in that the hollow portion includes a filter holder slide having a glass filter and an infrared ray removing filter inserted therein and linearly moving by the guide of the plate.
The method according to claim 4,

The filter change assembly for the camera module using the electromagnet rotating device,

A filter base for supporting the CCD correction filter;

The filter change assembly for a camera module using an electromagnet rotating device, characterized in that it further comprises a CCD correction filter for correcting the CCD mounted on the camera module.
The method according to claim 4 or 5,

The electromagnet rotating conductor,

An electromagnet coil which forms an electric field when electricity flows;

An electromagnet stationary body which adheres to the electromagnet rotating device to fix the electromagnet rotating device when the electric field disappears because electricity does not flow;

An electromagnet coil support on which the electromagnet coil is wound and which supports the electromagnet coil;

A PCB which is wired for electricity to flow through the electromagnet coil;

Filter change assembly for a camera module using an electromagnet rotating apparatus comprising a connector for receiving a voltage from the microcomputer.
The method according to claim 4 or 5,

The electromagnet rotating device,

An electromagnet for rotating electric motion by applying electric force by the electric field when electricity flows through the electromagnet rotating conductor;

And an electromagnet shaft integrated with the electromagnet and acting as a rotating shaft of the electromagnet to transfer the rotational movement of the electromagnet to the filter holder slider.
The method according to claim 4 or 5,

The glass filter,

Filter change assembly for a camera module using an electromagnet rotating device, characterized in that the AR coating glass.
The method according to claim 4 or 5,

The infrared removal filter,

Filter change assembly for a camera module using an electromagnet rotating device, characterized in that to reproduce the color by blocking the infrared light entering through the lens.
The method according to claim 6,

The electromagnet fixed body is,

Filter change assembly for a camera module using an electromagnet rotating device, characterized in that consisting of pure iron.