WO2005033792A1

WO2005033792A1 - A shutter apparatus of camera

Info

Publication number: WO2005033792A1
Application number: PCT/KR2004/002549
Authority: WO
Inventors: Heon-Ju Jang; Sang-Hwa Cho; Hwa-Sup Yoon
Original assignee: Ct Electronics Co., Ltd.
Priority date: 2003-10-07
Filing date: 2004-10-06
Publication date: 2005-04-14

Abstract

A shutter apparatus of camera are disclosed. The shutter apparatus of camera installed at a mobile phone includes coils to which the external supplied power is provided, a magnet disposed within the field of magnet, and a rotor for rotating shutter plates by the coil and magnet. The shutter further includes a yoke installed at the center of coil for inducting the field of magnet. Hence, the shutter of camera can be compacted.

Description

A SHUTTER APPARATUS OF CAMERA

FIELD OF THE INVENTION

The present invention relates to a shutter apparatus of camera, and more particularly to a shutter apparatus of a camera which enables a shutter apparatus for camera installed in a telecommunication terminal to have simple structure and small

size .

BACKGROUND OF THE INVENTION

Generally, in a camera having an electronic shutter, an automatic focus adjusting process for controlling exposure of

a lens according to the distance between a user and a subject in order to focus the subject, and an automatic exposing process for controlling the size of an opening of aperture according

to the brightness of the subject are conducted sequentially and

automatically. The technology of a camera appliedwith the above electronic shutter is disclosed inU.S. Patent No.4, 918,480 (Oct.27, 1998) , U.S. Patent No. 4,634,254 (Jun. 20, 1985), U.S. Patent No. 5,111,230 (Aug.28, 1990) , Japanese Laid-open Patent Publication No. Sho 61-9632, Korean Patent Application No. 1997-0038300, and Korean Patent No. 261,600. A lens barrel in the conventional camera like the above is actuated by power supplied from a power source, and a shutter is actuated by the actuation of the lens barrel. Hence, since the power of the power source is supplied to the lens barrel, a camera is worked by one power source. However, the shutter apparatus of the conventional camera required complex structure of transmitting power and many mechanism parts for supplying the power to each apparatus. Thus, the complex structure hindered the shutter apparatus of the conventional camera from being installed in a portable telecommunication terminal. Accordingly, in order to reduce the size of a camera installed in the portable terminal, a power source for actuating a lens barrel and another power source for actuating a shutter were required to be equipped in the camera separately. Also, when photographing an immobile screen by using the above camera, it was necessary to adjust the brightness introduced from a subj ect . The quality of the photographed image was determined by the speed of shutter plates which are opened and closed in a twinkling. However, in the shutter apparatus disclosed in the above patents and application, power is conveyed by a number of gears, which makes the response speed to get slow.

Hence, at the time of photographing an immobile image, the quality of image became deteriorated. SUMMARY OF THE INVENTION

Hence, the object of the present invention is to provide a shutter apparatus of a camera which has enhanced response speed and can photograph an image with high quality. In order to achieve the above object, the shutter apparatus of a camera according to a first point of view of the present invention comprises: a base section having a light penetrating hole which passes light through a number of lenses installed in a lens barrel; a shutter unit established at the base section for opening/closing the light penetrating hole; a first actuating part established at the base section for actuating the shutter unit according to the magnetic field of

a coil, which is generated by the power source supplied from the outside in order to open/close the light penetrating hole, and according to the polarity of a magnet; an aperture unit established at the base section for adjusting the brightness which passes through the light penetrating hole; and a second actuating part established at the base section

for actuating the aperture unit according to the magnetic field of a coil, which is generated by the power source supplied from the outside, and according to the polarity of magnet. Herein, the base section comprises a first base and a second base. A first light penetrating hole is formed at the first base, which passes light through the plurality of lens. The first and the second actuating parts are placed at the first base. Also, the second base is established at the surface opposite to the first base. The second base includes a plane which is actuated by the shutter unit and the aperture unit, at which the light penetrating hole is formed. The second light penetrating hole is formed at the position opposite to the first light penetrating hole of the first base. In addition, a protruded surface is formed on the plane, at the position along which the shutter unit and the aperture unit move and at the periphery of the second light penetrating hole. The protruded surface reduces friction among the shutter unit, the aperture unit and the second base. The shutter unit is formed at the first base of the base section, and comprises shutter plates. The shutter plates are coupled to be rotatable to the hinge shaft, and open/close the first light penetrating hole and the second light penetrating hole by rotation. A pair of shutter plates are respectively placed at the positions opposite to each other around the first light penetrating hole and the second light penetrating hole. At the pair of shutter plates, a first arc hole is formed.

Also, a first actuating shaft of the first actuating part is coupled to the first arc hole. When the first actuating shaft conducts circular motion, the pair of shutter plates open/close the first and the second light penetrating holes simultaneously. The first actuating part comprises a first coil which is wound several times and supplied with power source from the outside; a first magnet established within the position where the magnetic field formed by the first coil covers; and a first rotor in which the first magnet is installed and which is supported by the first actuating shaft . In other words , if no power source supplied from the outside is applied to the first coil, the first polarity of the first magnet approaches the first coil. Otherwise, if the power source is applied to the first coil, the magnetic field formed by the first coil is exposed to the second polarity of the first magnet, and the first actuating shaft rotates . Then, the rotational force of the first actuating

shaft is conveyed to the shutter unit. In addition, the first actuating part additionally comprises a first yoke which is coupled to the center of the first coil, and magnetized when power source is supplied to the

first coil to induce the magnetic field generated from the first coil . Further, the first actuating part comprises a first elastic member. The first elastic member restores the first rotor as

it was if power source is cut off while the power source is being supplied to the first coil, and the first rotor is rotating. In other words, the first elastic means comprises a first torsion spring. The center of the first torsion spring is fixed to the rotation center shaft of the first rotor, one end of the first torsion spring is supported by the first base, and the other end of the first torsion spring is supported by the first rotor. The aperture unit comprises a brightness adjusting hole and an aperture plate. The brightness adjusting hole adjusts the amount of light which passes the light penetrating hole, and the aperture plate is coupled to a hinge shaft formed at the first base . According to the rotation motion of the aperture plate, the light penetrating hole is opened/closed. A second arc hole is formed at the aperture plate disposed at the first base, and coupled to a second actuating shaft of the second actuating part. When the second actuating shaft conducts circular motion, the aperture plate opens/ closes the light penetrating hole as much as the radius of the second arc hole . The second actuating part comprises a second coil which is wound several times and supplied with power source from the outside; a second magnet placed within the position where the magnetic field formed by the second coil covers; and a second rotor which is installed in the secondmagnet . If no power source is applied to the second coil, the second rotor makes the first polarity of the second magnet to approach the second coil. Otherwise, if the power source is applied to the second coil, the second rotor makes the aperture unit disposed at the second base to rotate by the second polarity of the second magnet and the magnetic field generated from the second coil. In addition, the second actuating part additionally

"comprises a second yoke which is coupled to the center of the second coil, and magnetized when power source is supplied to the second coil to induce the magnetic field generated from the second coil. Further, the second actuating part comprises a second elastic member. The second elastic member restores the second rotor as it was if power source is cut off while the power source is being supplied to the second coil, and the second rotor is rotating. In other words, the second elastic means comprises a second torsion spring . The center of the second torsion spring is fixed to the rotation center shaft of the second rotor, one end of the second torsion spring is supported by the first base, and the other end of the second torsion spring is supported by the second rotor. Also, a separation plate is positioned between the shutter unit and the aperture unit. The separation plate prevents collision between the shutter plate and the aperture plate while they are rotating. A cover for covering the shutter unit, the first actuating part, the aperture unit and the second actuating part is coupled to the base section. A third light penetrating hole is formed at the cover at the position corresponding to the first and the second light penetrating holes. Meanwhile, the present invention provides an actuating apparatus comprising a coil which is wound several times and supplied with power source from the outside; amagnet established within the position where the magnetic field of the coil is exposed; and a rotor in which the magnet is installed, which is supported by the shaft of the base, which makes the first polarity of the magnet to approach the coil if no power source is applied to the coil, and which conveys the second polarity of the magnet and the rotational force occurred by the magnetic field of the coil to the outside if the power source is applied to the coil . In addition, the actuating part additionally comprises a yoke which is coupled to the center of the coil, and magnetized when power source is supplied to the coil to induce the magnetic field generated from the coil. According to apreferred embodiment of the present invention, rotational force is created by the magnetic field generated from the first coil and the first yoke and by the first and the second polarities of the first magnet; the rotational force is conveyed to the first actuating shaft through the first rotor; the first actuating shaft rotates according to the first and the second polarities of the first magnet; and the shutter plates rotate after receiving the rotational force of the first actuating shaft . Meanwhile, rotational force is created by the magnetic field generated from the second coil and the second yoke, and created by the first and the second polarities of the second magnet; the rotational force is conveyed to the second actuating shaft through the second rotor; the second actuating shaft rotates according to the first and the second polarities of the second magnet; and the aperture plate rotates after receiving the rotational force of the second actuating shaft . In other words, a power source for actuating the shutter plates and another power source for actuating the aperture plate are separately prepared with simple structure and small size, so.that the response speed, which cuts off the brightness introduced from a subject momentarily, can be rapidly controlled. Therefore, the image quality can be improved when photographing an immobile image.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a perspective view showing the constitution of

a camera according to one embodiment of the present invention. Figs. 2-4 are perspective views showing the constitution of a shutter apparatus of Fig. 1.

Fig. 5 is a top plane view showing the constitution of a first actuating part of Fig. 4.

Fig. 6 is a top plane view showing the constitution of a second actuating part of Fig. 4. Fig. 1 is a perspective view showing the constitution of a shutter apparatus of a camera according to another embodiment of the present invention. Fig. 8 is a perspective view showing the constitution of a first actuating part of Fig. 7. Figs. 9-10 are perspective views showing the operational condition of the first actuating part of Fig. 7. Fig. 11 is a perspective view showing the disassembled condition of the first actuating part of Fig. 7. Fig. 12 is a top plane view showing the first actuating part of Fig. 11. Fig. 13 is a perspective view showing the constitution of

a shutter apparatus according to yet another embodiment of the present invention. Fig. 14 is a perspective view showing the constitution of a base section of Fig. 13. Fig. 15 is a perspective view showing the constitution of a first actuating part of Fig. 13.

Fig. 16 is a cross-sectional view showing the constitution of the first actuating part of Fig. 15.

Fig. 17 is a perspective view showing the constitution of a second actuating part of Fig. 15. Fig. 18 is a cross-sectional view showing the constitution of the second actuating part of Fig. 15. Fig. 19 is a perspective view showing the shutter unit and the aperture unit of Fig. 13. Figs.20-22 are perspective views showing the operational condition of the shutter unit and the aperture unit of Fig. 13.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Hereinafter, we would like to explain specifically the preferred embodiments of the present invention by referring to the drawings attached hereto.

<First Embodiment> Fig. 1 is a perspective view showing the constitution of a camera according to one embodiment of the present invention. As shown, reference number 200 represents a lens barrel having a number of lenses; reference number 100 represents an image sensor which is disposed at the upper surface of the lens barrel 200, and transforms the image, which has passed the plurality of lens, into an electric signal; and reference number 300 represents a shutter apparatus which is disposed at the lower surface of the lens barrel 200, and adjusts the brightness introduced through the plurality of lens. Fig. 2 is a perspective view showing the constitution of the shutter apparatus 300 of Fig .1. Fig .3 is a rear perspective view of the shutter apparatus of Fig .1. Fig .4 is a perspective view of the essential parts shown in Fig.3. As shown, the shutter apparatus 300 comprises a base section 310 having a light penetrating hole 312 which is coupled to the lens barrel 200 shown in Fig. 1 to provide light to the plurality of lens of the lens barrel 200; shutter plates 370 which open/close the light penetrating hole 312; a first actuating part 330 which is positioned at the periphery of the light penetrating hole 312, and actuates the shutter plates 370; an aperture plate 460 which adjusts the brightness introduced into the light penetrating hole 312; and a second actuating part 400 which is positioned at the periphery of the light penetrating hole 312, and actuates the aperture plate 460; and a substrate 500 which supplies a power source to the first actuating part 330 and the second actuating part 400. The shutter plates 370, which are coupled to the first actuating shaft 334 disposed at one side of the light penetrating hole 312, receive the rotational force of the first actuating part 330 and rotate to open/close the light penetrating hole 312. In addition, the aperture plate 460 is coupled to the second actuating shaft 412 disposed at one side of the light penetrating hole 312, andhas abrightness adjusting hole 462. Thebrightness adjusting hole 462 is established at the opposite surface to the light penetrating hole 312 of the base section 310. Thus, the aperture plate 460 rotates above the light penetrating hole 312 after receiving the rotational force supplied from the first actuating part 400, thereby the brightness introduced into the light penetrating hole 312 is adjusted by the brightness adjusting hole 462. Fig. 5 is a top plane view showing the constitution of a first actuating part of Fig. 4. As shown in Fig. 5, a first magnet 340 is disposed at the periphery of the light penetrating hole 312 of the base section 310, and coupled to a first actuating shaft 342. The first actuating shaft 342 rotates the shutter plates 370 by the polarity of the first magnet 340, and is disposed at the eccentricity of the rotating shutter plates 370. Then, a first yoke 350 is disposed at the opposite surface of both polarities of the first magnet 340 of the base section 310. A first coil 360, which is wound several times around the first yoke 350, is coupled to the substrate 500. At the periphery of one side of the light penetrating hole

312 of the base section 310, a first housing space part 314 is formed. Also, at the first housing space part 314, the first magnet 340 and the first yoke 350 are formed. Then, at the center of the first magnet 340, a first hinge shaft 320 is formed. The first hinge shaft 320 is coupled to the first shaft hole 374 formed at the shutter plates 370. The first actuating shaft 342 is coupled to a second shaft hole 376

-formed at the shutter plates 370. Herein, the polarity of the first permanent magnet 340 is divided into four sections. The assembly angle of the first actuating shaft 342 is 40°. Fig. 6 is a top plane view showing the constitution of a second actuating part 400 shown in Fig. 4. As shown in Fig. β, a second magnet 410 is disposed at the periphery of the light penetrating hole 312 of the base section 310, and coupled to a second actuating shaft 412. The second actuating shaft 412 is supported by a shaft in order to rotate the aperture plate 410, and disposed at the eccentricity of the rotating aperture plate 410. Then, a second yoke 420 is disposed at the opposite surface of both polarities of the second magnet 410. A second coil 430, which is wound several times aroundthe secondyoke 420, is coupled to the substrate 500. In the base section 310, at the periphery of the light penetrating hole 312, which corresponds to the first housing space part 314 , a second housing space part 316 is formed. Also, at the second housing space part 316, the second magnet 410 and the second yoke 420 are formed. Then, at the center of the second magnet 410, a second hinge shaft 322 is formed. The second hinge shaft 322 is coupled to the third shaft hole 464 formed at the aperture plate 460. The second actuating shaft 412 is coupled to a fourth shaft hole

464 formed at the aperture plate 460. Herein, the polarity of the second permanent magnet 410 is divided into four sections . The assembly angle of the second actuating shaft 412 is 40°. Hereinafter, the operation of the shutter apparatus having the aforesaid constitution will be explained. When photographing a mobile image, the aperture plate 460 and the shutter plates 370 maintain the open condition of the light penetrating hole 312 in the base section 310. Also, when photographing an immobile image clearly, the shutter apparatus 300 cuts off the image momentarily, which passes through the light penetrating hole 312 to be introduced into the lens group. For this process, firstly, if the power source applied to the second actuating part 400 through the substrate 500 is supplied to the second coil 430, the second yoke 420 is magnetized according to the magnetic field generated from the second coil 430 to create actuating force which rotates the second magnet

410, while the second actuating shaft 412 rotates at 40° around the second hinge shaft 322 according to the rotation of the second magnet 410. The aperture plate 460, which is supported by the second hinge shaft 322 and coupled to the second hinge shaft 412, rotates at 40° according to the rotation of the second actuating shaft 412, and is positioned at the front of the light penetrating hole 312. Only small quantity of light, which has passed through the light penetrating hole 312 from the outside, is introduced through the brightness adjusting hole 462 of the aperture plate 460. This light passes through a number of lenses installed in the lens barrel 200, and forms an image at an image

sensor 100. Subsequently, if power source is applied to the first actuating part 330 through the substrate 500, it is supplied to the first coil 360.. Then, the first yoke 350 is magnetized according to the magnetic field generated from the second coil 430 to create actuating force for rotating the first magnet 340, while the first actuating shaft 342 rotates at 40° around the first hinge shaft 320 according to the rotation of the first magnet 340. Accordingly, the shutter plates 370, which is supported by the first hinge shaft 320 and coupled to the first

hinge shaft 342, rotates at 40°, and is positioned at the front of the light penetrating hole 312. Hence, the light, which has been introduced through the light penetrating hole 312 from the

outside, is cut off by the shutter plates 370 from the brightness adjusting hole 462. Since the above operation of the shutter plates 370 is conducted in a moment, a momentary immobile image is formed at

the image sensor 100. Thus, the speed of the operation of the shutter plates 370 is the most important variable that determines the quality of an immobile image. With a simple structure, the shutter apparatus 300 of this

embodiment can not only be applied to a miniature camera, but also can photograph an immobile image clearly with the momentary •speed which can be increased at its maximum.

<Second Embodiment> Fig. 7 is a perspective view showing the constitution of a shutter apparatus of a camera according to another embodiment of the present invention. Fig. 8 is a perspective view showing the constitution of a first actuating part of Fig. 7. Figs. 9-10 are perspective views showing the operational condition of the first actuating part shown in Fig. 7. Fig. 11 is a perspective view showing the disassembled condition of the first actuating part of Fig. 7. Fig. 12 is a top plane view of the first actuating part of Fig. 7. As shown in the drawings, reference number 600 represents a base having a light penetrating hole 602 whichpasses light through a number of lenses . Reference number 610 represents shutter plates which are coupled to the base 100 by a hinge shaft 606 in order to open/close the light penetrating hole 602. Reference number 620 represents a link coupled to the base 600 for actuating the shutter plates 610. Also, reference number 630 represents a magnet coupled to the link 620, and reference number 660 represents a control section •for supplying power source to electromagnetic parts consisting of coils 640 and yokes 650. The shutter plates 610 are coupled to the hinge shaft 606 formed at the base section 600 to be rotatable, and rotates according to the operation of the link 620 to open/close the light penetrating hole 602. A pair of shutter plates are respectively placed at the positions opposite to each other around the light penetrating hole 602, and open/close the light penetrating hole 602 at both sides simultaneously by the operation of the link 620. Both the shutter plates 610 are disposed at the base 600. An elongated hole 614, to which an actuating shaft 624 of the link 620 is coupled, is formed at each of the shutter plates 610. When the actuating shaft 624 conducts linear motion, each of the shutter plates 610 conducts circular motion to open/close the light penetrating hole 602 simultaneously. The link 620 has a shaft holder 622, which is coupled to a center shaft 604 fixed to the base 600 to be rotatable, and an actuating shaft 624 for conveying power to the shutter plates 610. The coils 640 of the electromagnetic parts are wound several times, and supplied with power source from the control section 660. Also, the yokes 650 are coupled to the center of the coils 640, and magnetized when power source is supplied to the coils 640 so as to induce the magnetic field generated from the coils 640. In other words, the coils 640 and the yokes 650 in the electromagnetic parts are disposed at each side of the magnet

630 apart from the magnet 630 as much as a designated distance. The polarity of the magnet 630 is divided toward the yokes 650 at both sides. It becomes the N pole in one of the yokes 650 and becomes the S pole in the other one of the yokes 650. Herein, the polarity of the magnet 630 is divided into six sections. The assembly angle of the shutter plates 610 by the actuating shaft 624 is 30.36°. Hereinafter, the operation of the shutter apparatus having the aforesaid constitution will be explained. In order to photograph an image of a subject in a camera apparatus, the light penetrating hole 602 is opened* entirely, and light reaches an image sensor after passing through a number of lenses, so that the image of the subject can be picked up brightly. In other words, the power source supplied from the control section 660 is not applied to the coils 640, and the pair of shutter plates 610 maintain the light penetrating hole 602 to be opened, as shown in Fig. 9. Meanwhile, when photographing an immobile subj ect, as shown in Fig.10, the light, which is introduced into a number of lenses groups after passing through the light penetrating hole 602, is cut off by the pair of shutter plates 610 momentarily. Specifically, if power source is applied to the coils 640 from the control section 660, a pair of yokes are magnetized to induce magnetic field generated from the coils 640. One of the yokes 650 near the magnet 630 turns into identical polarity with that of the magnet 130 by the magnetic field induced by the pair of yokes 650. Hence, one of the yokes 650 near the magnet 630 pushes the magnet 630. Then, the other one of yokes 650 relatively far from the magnet 630 turns into different polarity from that of the magnet 630, and pulls the magnet 630. By the operation of the magnet 630 and the pair of yokes

650, the link 620 rotates around the center shaft 604. According to the rotation of the link 620, the actuating shaft 624 moves along the elongated hole 614 formed at the pair of shutter plates 610. Accordingly, the pair of shutter plates 610 are gathered simultaneously at both sides of the light penetrating hole 602, and close the light penetrating hole 602. In other words, since the two shutter plates 610 meet simultaneously from both sides of the light penetrating hole 602, the light introduced through the light penetrating hole 602 is cut off at high speed. Since the image quality of an immobile subj ect is determined by the cut-off speed of the shutter plates 610, the shutter apparatus according to this embodiment controls the moving speed of the shutter plates 610 rapidly, so that it can photograph an immobile subject of good quality. Meanwhile, after the photographing of an immobile subject is finished, the control section 660 applies a current to the coils 640 in a reverse direction in order to open the light penetrating hole 602. Accordingly, the pair of yokes 650 is magnetized to counter polarity to the former one, and pull the magnet 630 in a reverse direction to the former one. Then, the link 620 rotates around the center shaft 604 in a reverse direction to the former one. According to the rotation of the link 620, the actuating shaft 624 pulls the elongated hole 614 of the pair of shutter plates 610 in a reverse direction to the former one. Accordingly, the pair of shutter plates 610 opens the light penetrating hole 602. If the light penetrating hole 602 is opened, the control section 660 cuts off the current being applied to the coils 640. In other words, since the coils 640 are wound around each of the two yokes 650, the actuating force of the shutter plates 610 gets increased by two times greater than the case where one coil is wound around one yoke. Therefore, the rotating angle of the shutter plates becomes small, so the moving speed of the shutter plates 610 becomes fast. Hence, the cut-off speed of the light penetrating hole 602 is increased by the shutter plates 610. Since the constitution and the operation of the aperture plate and the second actuating part in the shutter apparatus are the same as those in the first embodiment, detailed explanation thereof is omitted.

<Third Embodiment> Fig. 13 is a perspective view showing the constitution of a shutter apparatus according to yet another embodiment of the present invention. Fig. 14 is a perspective view showing the constitution of a base section shown in Fig. 13. Fig. 15 is a perspective view showing the constitution of a first actuating part shown in Fig. 13. Fig. 16 is a cross-sectional view of the constitution of the first actuating part shown in Fig. 15.

Fig .17 is a perspective view showing the constitution of a second actuating part shown in Fig. 15. Fig. 18 is a cross-sectional view showing the constitution of the second actuating part of

Fig. 15. Fig. 19 is a perspective view showing the constitution of the shutter unit and the aperture unit shown in Fig.13. Figs. 20-22 are perspective views showing the operational condition

of the shutter apparatus of Fig. 13. As shown in Fig. 13, the shutter apparatus of a camera according to the present invention is disposed at a lens barrel of a camera, and comprises a base section having a light penetrating hole which penetrates light through a number of

lenses installed in the lens barrel; a shutter unit established at the base section for opening/closing the light penetrating

hole; a first actuating part established at the base section for actuating the shutter unit to open/close the light

penetrating hole by the base section; an aperture unit established at the base section for adjusting the brightness from the light penetrating hole; and a second actuating part established at the base section for actuating the aperture unit. Herein, the base section comprises a first base and a second base, wherein the first base 700 forms a first penetrating hole

702 which passes light being introduced through a number of lenses , and places the first and the second actuating parts; and the second base 720 is coupled to the first base 700, forms a second light penetrating hole 722 at the position opposite to the first light penetrating hole 702, and provides a plane 724 established at the opposite surface to the first base 700 for actuating the shutter unit and the aperture unit. At the first base 700, a first housing space part 710 disposing the first actuating part and a second housing space part 716 disposing the second actuating part are formed. A protruded surface 726 is formed at the tracing where the shutter unit and the aperture unit move and at the periphery of the second light penetrating hole 722, in order to reduce friction among the shutter unit, the aperture unit and the second base 720. The shutter unit comprises a first shutter plate 750 and a second shutter plate 760. The first shutter plate 750 is coupled to a second hinge shaft 732 formed at the second base 720 to be rotatable. The second light penetrating hole 722 is opened/closed by the rotation of the first shutter plate 750.

Then, the second shutter plate 760 is coupled to a third hinge shaft 734 formed at the second base 720 to be rotatable. The second light penetrating hole 722 is opened/closed according to the rotation of the second shutter plate 760. A pair of the first shutter plate 750 and the second shutter plate 760 are respectively placed at the positions opposite to each other around the second light penetrating hole 722. At the pair of shutter plates, a first arc hole 730 is formed. Also, a first actuating shaft 794 of the first actuating part is coupled to the first arc hole 730. When the first actuating shaft 794 conducts circular motion, the first shutter plate 750 and the second shutter plate 760 open/close the second light penetrating hole 722 simultaneously. Meanwhile, the first actuating part comprises a first coil

780, which receives power source from the outside and generates magnetic field; a firstmagnet 784 positionedwithin themagnetic field of the first coil 780; and a first rotor 790 in which the first magnet 784 is installed. Herein, if power source is not applied to the first coil

780, the first rotor 790 approaches the first coil 780 due to .the first polarity of the first magnet 784. If power source is applied to the first coil 780, the first rotor 790 rotates due to the second polarity of the first magnet 784, and the force following the rotation is conveyed to the shutter unit. In addition, in order to make the magnetic field generated from the first coil 780 to approach the first magnet 784, the first actuating part connects a first yoke 782, which is magnetized when the first coil 780 is supplied with power source, with the center of the first coil 780. The first hinge shaft 792 is formed at the first rotor 790.

Also, a first shaft holder 712 is formed in a first housing space part 710 of the first base 700, and rotates the first hinge shaft

792. In addition, the first actuating part comprises a first elastic means which restores the first rotor 790 as it was if power source supplied to the first coil 780 is cut off while the first rotor 790 is rotatingwhenpower supply is being supplied to the first coil 780. The first elastic means comprises a first torsion spring

800. The center of the first torsion spring 800 is fixed to the first hinge shaft 792 of the first rotor 790, one end thereof is supported by the first base 700, and the other end thereof is supported by the first rotor 790. Meanwhile, the aperture unit is composed of an aperture plate 850 which is coupled to a fifth hinge shaft 738 formed at the first base 700 to be rotatable. The aperture plate 850 forms a brightness adjusting hole 856 for adjusting the light which passes through the second light penetrating hole 722. In other words, according to the rotation motion of the aperture plate 850, the second light penetrating hole 722 is opened/closed. At the aperture plate 850, the first base 700 is disposed, and a second arc hole 736, into which the second actuating shaft 834 of the second actuating part is inserted, is formed. Then, when the second actuating shaft 834 conducts circular motion in the second arc hole 736, the aperture plate 850 opens/closes the second light penetrating hole 722. The second actuating part comprises a second coil 820 which is wound several times and supplied with power source from the outside; a secondmagnet 824 positioned within the position where the magnetic field formed by the second coil 820 covers; and a second rotor 830 in which the second magnet 824 is installed.

If no power source is applied to the second coil 820, the second rotor 830 makes the first polarity of the second magnet 824 to approach the second coil 820. Otherwise, if the power source is applied to the second coil 820, the second rotor rotates by the second polarity of the second magnet 820. ^' The rotational force of the second rotor 830 is supplied to the aperture plate 850. In addition, the second actuating part comprises a second yoke 822 coupled to the center of the second coil 820 for magnetic field to approach the secondmagnet 824, wherein the second yoke is magnetized when power source is supplied to the second coil 820. Furthermore, the second actuating part further comprises the second elastic means, wherein the second elastic means restores the second rotor 830 as it was if power source is cut off while the power source is being supplied to the second coil 820 and the second rotor 830 is rotating. The second elastic means comprises a second torsion spring

840. The center of the second torsion spring 840 is fixed to the fourth hinge shaft 832 of the second rotor 830, one end thereof is supported by the first base 700, and the other end thereof is supported by the second rotor 830. The shutter apparatus 300 for a miniature camera according to this embodiment further comprises a cover 810 for covering the shutter unit, the first actuating part, the aperture unit and the second actuating part, wherein the cover 810 is coupled to the second base 720, and forms a third light penetrating hole

^'812 corresponding to the second light penetrating hole 722. Also, the shutter apparatus for aminiature camera according to this embodiment disposes a separation plate 870 for avoiding collision between the shutter unit and the aperture unit. At the separation plate 870, a fourth shaft hole 882 for passing the second hinge shaft 732, a fifth shaft hole 884 for penetrating the third hinge shaft 734 and a third arc hole 880 for passing the first actuating shaft 794. Further, at the separation plate

^'870, a fourth light penetrating hole 872, which conforms to the second light penetrating hole 722, and a sixth shaft hole 892 are formed through which the fifth hinge shaft 738 passes. A fourth arc hole 890 for passing the second actuating part 834 is formed. In addition, a first screw hole 714 is formed at the first base 700, a first light penetrating hole 742 corresponding to the first screw hole 714 is formed at the second base 720, and a second penetrating hole 814 corresponding to the first penetrating hole 742 is formed at the cover 810. Further, the screw passes through the second light penetrating hole 814 and the first light penetrating hole 842, and is coupled to the first screw hole 714, thereby the cover 810 and the second base 820 are coupled to the first base 700. A guide rib 740 is formed at the edges of the second base 7-20 in order to ensure space for the shutter unit to be disposed between the second base 720 and the cover 810. Hereinafter, the operation of the shutter apparatus having the aforesaid constitution will be explained. First, when photographing a mobile image in a camera apparatus, as shown in Fig. 19, the shutter apparatus 300 must open all the light penetrating holes in order to supply enough light introduced through a number of lenses to an image sensor 200. Herein, unless the control section (not shown) applies power source to the first coil 780 and the second coil 820, the first shutter plate 750, the second shutter plate 860, and the aperture plate 850 maintain the second light penetrating hole 722 to be opened. Meanwhile, whenphotographing an immobile subject, as shown in Fig. 20, the shutter apparatus 300 momentarily cuts off the light which is introduced into a number of lenses through the first to third light penetrating holes . In order to carry out this process, if the amount of light introduced into the first to third light penetrating holes is small, the aperture plate 850 does not work, and the first shutter plate 750 and the second shutter plate 760 work, thereby closing the second light penetrating hole 722. Otherwise, if the amount of light introduced into the second light penetrating hole 722 is large, as^' shown in Fig. 21, the aperture plate 850 works earlier than the first shutter plate 750 and the second shutter plate 760 to adjust the amount of light introduced into the second light penetrating hole 722 in advance. Subsequently, as shown in Fig. 22, the first shutter plate 750 and the second shutter plate 760 work to close the second light penetrating hole 722. Then, in case where the amount of light introduced into the second light penetrating hole 722 is small, if power source is applied from the control section to the first coil 780, the first yoke 782 is magnetized by the magnetic field generated from the first coil, so the polarity of the end of the first yoke 782 confronting the first magnet 784 becomes identical with the first polarity of the first magnet 784. Therefore, a force of repulsion is created at the first polarity party of the first magnet 784, which becomes far from the first yoke 782, while a force of attraction is created at -the second polarity part of the first magnet 784, which becomes to approach the first yoke 782. Thus, the first magnet 784 and the first rotor 790 overcome the elasticity of the first torsion spring 800, and rotate around the first hinge shaft 792, which results in the motion of the second polarity of the first magnet 784 toward the position confronting the first yoke 782. During this process, the first rotor 790 rotates, and the first actuating shaft 794 moves as it is coupled to the first shutter plate 750, to the first arc hole 730 of the second shutter plate 760 and to the third arc hole 880. Accordingly, the first shutter plate 750 and the second shutter plate 760 rotate around the second hinge shaft 732 and the third hinge shaft 734 to close the second light penetrating hole 722. Herein, since the first shutter plate 750 and the second shutter plate 760 are gathered simultaneously from both sides of the second light penetrating hole 722, the light introduced into the second light penetrating hole 722 is cut off at high speed. The quality of an immobile image depends on the cut-off speed of the first and the second shutter plates 750, 760. Thus, it is possible to photograph the image of an immobile subject with good quality by maximizing the speed of the first and the second shutter plates 750, 760. Meanwhile, if power source supplied to the first coil 780 is cut off, the magnetic field formed at the first yoke 782 becomes disappeared. Thus, due to the elasticity of the first torsion spring 200 to restore the first rotor 790 as it was, the rotor 790 and the first magnet 784 get restored as they were. In the condition that the first actuating shaft 794 is coupled to the first arc hole 730 and to the third arc hole 880 of the first shutter plate 750 and the second shutter plate 760, the first actuating shaft 794 formed at the first rotor 790 moves reverse to the direction of closing the first and the second shutter plates 750, 760. Accordingly, the first shutter plate 750 and the second shutter plate 760 rotate around the second hinge shaft 732 and the third hinge shaft 734 to open the second light penetrating hole 722. Next, the case where the amount of light introduced into the light penetrating hole is large will be explained below. If power source is applied to the second coil 820 from the control section, the second yoke 822 is magnetized, and the polarity of the end of the second yoke 822 confronting the second magnet 824 becomes identical with the first polarityof the second magnet 824. Therefore, a force of repulsion is created at the first polarity part of the second magnet 824, which becomes far from the second yoke 822, while a force of attraction is created at the second polarity part of the second magnet 824 , which becomes to approach the second yoke 822. Thus, the second magnet 824 and the second rotor 830 overcome the elasticity of the second torsion spring 840, and rotate around the fourth hinge shaft ,832, which results in the motion of the second polarity of the second magnet 824 toward the position confronting the second yoke 822. During this process, as the second rotor 830 rotates, the second actuating shaft 834 moves as it is coupled to the second arc hole 736 and to the fourth arc hole 890 of the aperture plate

850. Accordingly, the aperture plate 850 rotates around the fourth hinge shaft 832, and the second light penetrating hole

722 is closed. Thus, the light supplied from the outside is introduced into a number of lenses through the brightness adjusting hole 856 of the aperture plate 850 and through the second light penetrating hole 722. Due to the rotation of the aperture plate 850, the amount of light introduced into the lens through the second light penetrating hole 722 is reduced. Subsequent to the operation of the aperture plate 850 reducing the amount of light, the first shutter plate 750 and the second shutter plate 760 simultaneously close the second light penetrating hole 722 by the aforementioned operation. In addition, the opening operation of the first shutter plate 750 and the second shutter plate 760 are identical with the aforementioned operation. Meanwhile, if the power source supplied to the second coil

820 is cut off, the magnetic field formed at the second coil

820 and at the second yoke 822 gets disappeared. Thus, due to the elasticity of the second torsion spring 840 forcing the second rotor 830 to rotate as it was, the second rotor 830 and the second magnet 824 become restored as they were. As explained above, in the shutter apparatus of a camera according to the present invention, the power source for actuating the shutter plates and the power source for actuating the aperture plate are made separately to be simple and small.

Therefore, response speed for momentarily cutting off the amount of light introduced from a subject can be controlled rapidly.

Accordingly, the present invention is capable of improving the quality of an image at the time of photographing an immobile image . The present invention is specifically explained by the preferred embodiments, but it is not only confined to the above embodiments. Thus, alternation or improvement of the present invention is still possible within the ordinary knowledge scope of a person skilled in the art.

Claims

WHAT IS CLAIMED IS: 1. A shutter apparatus of camera comprises: a base section disposed at a lens barrel of a camera, having a light penetrating hole which passes light through a number of lenses installed in said lens barrel; a shutter unit established at said base section for

opening/closing said light penetrating hole; and a first actuating part established at said base section for actuating said shutter unit with the magnetic field of a coil, which is generated by the power source supplied from the outside, and with the force generated by the magnetic field of a magnet .

2. The shutter apparatus of camera according to claim 1 comprises: an aperture unit established at said base section for adjusting the exposure of said light penetrating hole; and a second actuating part established at said base section for actuating said aperture unit according to the magnetic field of a coil, which is generated by the power source supplied from the outside, and according to the polarity of a magnet.

3. A shutter apparatus of camera comprises: a base section disposed at a lens barrel of a camera, having a light penetrating hole which passes light through a number of lenses installed in said lens barrel; an aperture unit established at said base section for adjusting the exposure of said light penetrating hole; and a second actuating part established at said base section for actuating said aperture unit with the magnetic field of a 5 coil, which is generated by the power source supplied from the outside, and with the polarity of a magnet.

4. The shutter apparatus of camera according to any one of claims 1-3, characterizedin that saidbase section comprises : a first base forming a first light penetrating hole which

10 passes light through said plurality of lens, and housing said first actuating part and said second actuating part; and a second base coupled to said first base, forming a second light penetrating hole is formed at the corresponding position to said first light penetrating hole, and providing a plane 5 confronting to said first base, on which said shutter unit and said aperture unit move.

5. The shutter apparatus of camera according to claim 4, characterized in that at said plane, a protruded surface for reducing friction among said shutter unit, said aperture unit

!0 and said second base is formed along the trace where said aperture unit moves and along the periphery of said second light penetrating hole.

6. The shutter apparatus of camera according to claim 1 5 or 2, characterized in that said shutter plates are coupled to a hinge shaft formed at said base section to be rotatable, and which rotate by said first actuating part to open/close said light penetrating hole.

7. The shutter apparatus of camera according to claim 6, characterized in that said shutter plates are disposed at the positions confronting each other around said light penetrating hole .

8. The shutter apparatus of camera according to claim 6, characterized in that said shutter plates respectively form a first arc hole to which a first actuating shaft of said first actuating part is coupled, and they are established at said base section to open/close said light penetrating hole simultaneously when said first actuating shaft conducts circular motion.

9. The shutter apparatus of camera according to claim 1 or 2, characterized in that said first actuating part comprises : a first coil which is wound several times, and generates magnetic field by being supplied with power source from the outside; a first magnet positioned within the position where the magnetic field formed by said first coil covers; and a first rotor in which said first magnet is installed, which makes the first polarity of said first magnet to approach said first coil if no power source is applied to said first coil, and which conveys the second polarity of said first magnet and the rotational force generated by the magnetic field of said first coil to said shutter unit established at said base section if power source is applied to said first coil.

10. The shutter apparatus of camera according to claim 9, characterized in that said first actuating part additionally comprises a first yoke which is coupled to the center of said first coil, and magnetized when power source is supplied to said first coil to induce the magnetic field generated from said first coil .

11. The shutter apparatus of camera according to claim 9, characterized in that said first actuating part additionally comprises a first elastic member which restores said first rotor as it was if power source is cut off while the power source is being supplied to said first coil, and said first rotor is rotating.

12. The shutter apparatus of camera according to claim 11, characterized in that said first elastic means is a first torsion spring of which center is fixed to the rotation center shaft of said first rotor, of which one end is supported by said base section, and of which the other end is supported by said first rotor .

13. The shutter apparatus of camera according to claim 2 or 3, characterized in that said aperture unit is composed of an aperture plate which is coupled to be rotatable to a hinge shaft formed at said base section, which forms a brightness adjusting hole for adjusting the amount of light passing through said light penetrating hole, and which rotates by said second actuating part to open/close said light penetrating hole.

14. The shutter apparatus of camera according to claim 13, characterized in that said aperture plate forms a second arc hole to which a second actuating shaft of said second actuating part is coupled, and it is disposed at said base section to open/close saidlight penetratinghole when said second actuating shaft conducts circular motion.

15. The shutter apparatus of camera according to claim 2 or 3, characterized in that said second actuatingpart comprises : a second coil which is wound several times, and supplied with power source from the outside to generate magnetic field; a second magnet positioned within the position where the magnetic field formed by said second coil covers; and a second rotor in which said second magnet is installed, which makes the first polarity of said second magnet to approach said second coil if no power source is applied to said second coil, and which conveys the second polarity of said secondmagnet and the magnetic field generated from said second coil to said aperture unit if power source is applied to said second coil.

16. The shutter apparatus of camera according to claim 15, characterized in that said second actuating part additionally comprises a second yoke which is coupled to the center of said second coil, and which induces the magnetic field generated from said second coil when power source is supplied to said second

coil.

17. The shutter apparatus of camera according to claim 15, characterized in that said second actuating part additionally comprises a second elasticmeans which restores said second rotor as it was if power source is cut off while the power source is being supplied to said second coil, and said second rotor is rotating.

18. The shutter apparatus of camera according to claim 17,

characterized in that said second elastic means is a second torsion spring of which center is fixed to the rotation center shaft of said second rotor, of which one end is supported by said base section, and of which the other end is supported by said second rotor.

19. The shutter apparatus of camera according to claim 2, characterized by additionally comprising a cover for covering said shutter unit, said first actuating part, said aperture unit and said second actuating part, which is coupled to said base section, and at which a third light penetrating hole corresponding to said light penetrating hole is formed.

20. The shutter apparatus of camera according to claim 2, characterized in that a separation plate is positioned between said shutter unit and said aperture unit in order to prevent collision therebetween.

21. The shutter apparatus of camera according to claim 1 or 2, characterized in that said first actuating part comprises : a link established at said base section for actuating said shutter unit; a magnet coupled to said link; and an electromagnetic part established at the base for generating magnetic field to move saidmagnet by the power source supplied from the outside.

22. The shutter apparatus of camera according to claim 1 or 2, characterized in that said shutter unit is composed of shutter plates which are coupled to a hinge shaft formed at said base section to be rotatable, and which open/close said light penetrating hole with the rotation shaft of said first actuating part .

23. The shutter apparatus of camera according to claim 22, characterized in that a pair of said shutter plates are respectively placed at the positions opposite to each other around said light penetrating hole, and they open/close said light penetrating hole simultaneously at both sides by the operation of said link.

24. The shutter apparatus of camera according to claim 23, characterized in that said shutter plates form an elongated hole to which an actuating shaft of said link is coupled, and conduct circular motion to open/close said light penetrating hole simultaneouslywhen said actuating shaft conducts linearmotion.

25. The shutter apparatus of camera according to claim 21, characterized in that said link comprises: a shaft holder which is coupled to be rotatable to a center shaft fixed to said base section; and an actuating shaft for conveying rotational force supplied from said electromagnetic part to said shutter unit.

26. The shutter apparatus of camera according to claim 21, characterized in that said electromagnetic part is disposed at each side of said magnet apart from said magnet as much as a designated distance.

27. A shutter apparatus of camera comprises: a coil which is wound several times, and generates magnetic field by being supplied with power source from the outside; a magnet positioned within the magnetic field generated by said coil covers; and a rotor in which said magnet is installed, which makes the first polarity of said magnet to approach said coil if no power source is applied to said coil, and which conveys^ the second polarity of said magnet and the rotational force generated by said coil to the outside if power source is applied to said coil.

28. The shutter apparatus of camera according to claim 27, characterized by additionally comprising a yoke which is coupled to the center of said coil, and magnetized when power source is supplied to said coil.