KR20060095623A - Shutter apparatus for camera - Google Patents

Abstract

According to the present invention, a shutter device for a camera is disclosed. The shutter device for the camera is a camera shutter device including at least two or more shutter blades for opening and closing the shutter opening and an actuator for driving the shutter blades, the actuator being wound on a part of the yoke and the yoke formed of a magnetic material, and optionally a current At least one coil and the yoke is in communication with the permanent magnet disposed opposite to one end is fixed to one end and the other end is a rotation center, the swing member for performing a swing movement by the electromagnetic force acting between the opposing permanent magnet and the yoke do. According to the disclosed camera shutter device, the structure can be reduced in size and the manufacturing cost can be reduced, and the manufacturing cost of the camera can be drastically reduced by combining the function of the shutter and the aperture by using one driving source.

Description

Shutter apparatus for cameras

1 is an exploded perspective view showing an actuator of a shutter device for a camera according to the prior art,

2 is an exploded perspective view showing an actuator of a shutter device for a camera according to a first embodiment of the present invention;

3a to 3c show the operation of the actuator shown in FIG. 2, respectively,

4a to 4c are views showing the opening and closing state of the shutter blades according to the actuator operation shown in Figs. 3a to 3c,

5 and 6 are views showing examples of different driving signals and exposure operations applicable to the shutter apparatus of the present invention, respectively;

7a to 7c are views showing a modification of the shutter blades shown in Figs. 4a to 4c,

8 is an exploded perspective view showing a modified example of the actuator shown in FIG.

9 is an exploded perspective view showing the actuator of the shutter device according to the second embodiment of the present invention;

10a to 10c are views showing an operating state of the actuator shown in FIG. 9,

11 and 12 are exploded perspective views showing a modification of the actuator shown in FIG.

<Description of Symbols for Major Parts of Drawings>

110,210,310,410,510,610: Shutter board

120,220,320,420,520,620: York

121,221,321,421,521,621: first stimulus

122,222,322,422,522,622: second stimulus

123,223,323,423,523,623: third stimulus

150,250,350,450,550,650: rocking member

152,252,352,452,552,652: drive pins

155,355,455,555,655: Permanent magnet

The present invention relates to a shutter device for a camera, and more particularly, to a miniaturization and a reduction in manufacturing cost through a simplified structure, and to a shutter device for a camera that performs a function of a shutter and an aperture together as a driving source. will be.

The aperture provided in the camera adjusts the amount of light flowing into the camera lens, and the shutter adjusts the time that light passes through the light sensing means. More specifically, in the case of a digital camera, Adjust the time for light to pass through a charge-coupled device (CCD).

1 shows an actuator of a camera shutter disclosed in Japanese Patent Laid-Open No. 2000-352739. The illustrated actuator includes a movable member 50 that rotates about the shaft portion 15, and a permanent magnet 55 formed on the movable member 50 to have a polarity in a vertical direction, and the permanent magnet 55. The first coil pairs 31a and 31b and the second coil pairs 32a and 32b which are formed in the vertical direction with each other) are included therebetween. In addition, the yoke 20a, 20b is disposed up and down to contact the coil pairs 31a, 31b, 32a, and 32b. Here, when current flows between the first coil pairs 31a and 31b and the second coil pairs 32a and 32b, the first coil pairs 31a and 31b and the second coil pairs 32a and 32b and between them. The movable member is rotated by the electromagnetic force acting between the permanent magnet 55 of the, more specifically, the movable member 50 is inserted into the shaft portion 15 in the through hole 51 formed at one end. Thus, the rotational movement is performed around the shaft portion 15. Accordingly, the pair of shutter blades (not shown) coupled with the movable member 50 via the operation pin 52 formed at the other end of the movable member 50 opens or closes the shutter opening (not shown).

However, according to the related art, the thickness of the shutter increases due to the arrangement of the coil pairs 31a, 31b, 32a, and 32b above and below the movable member 50, and the required number of coils increases, thereby increasing the manufacturing cost. There is a problem that increases. In particular, according to the prior art described above, since the actuator operates in an open-closed two-stage structure, the shutter operation and the aperture operation have to be performed by separate actuators, which causes the camera manufacturing cost to increase.

An object of the present invention is to provide a shutter device for a camera capable of reducing the number of components, reducing the size and manufacturing cost in order to solve the above problems and other problems.

Another object of the present invention is to provide a shutter device for a camera which performs a function of a shutter and an aperture together as one driving source.

In order to achieve the above and other objects, the shutter device for a camera of the present invention is a shutter device for a camera including at least two or more shutter blades for opening and closing the shutter opening, and an actuator for driving the shutter blades. Actuator is a yoke formed of a magnetic body, at least one coil wound around a part of the yoke, and a permanent magnet disposed opposite to the yoke and the other end is fixed to one end and the other end is the center of rotation is opposite to each other, the current is selectively communicated with each other, It includes a rocking member for performing a swing movement by the electromagnetic force acting between the permanent magnet and the yoke.

In the present invention, preferably, the shutter blades are formed with a guide slot, the permanent magnet is formed with a drive pin inserted into the guide slot, the drive pin is sliding along the guide slot, each shutter blade is It is rotated about an axis of rotation to open and close the shutter opening.

Preferably, the shutter blades adjust the shutter opening in three stages of opening, half-opening and closing, and the swinging members for driving the shutter blades have three different rotation angles respectively corresponding to the three stages. Intermittent swing.

Each coil wound around the yoke is preferably placed in a positive current application state communicated in one direction, a negative current application state communicated in the opposite direction, and a non-energized state in which no current is communicated.

The permanent magnet is preferably formed in a flat plate shape.

The yoke is preferably formed in an E shape including a first magnetic pole and a second magnetic pole formed on both outer sides with a third magnetic pole in the center and the third magnetic pole interposed therebetween.

In one embodiment of the present invention, the first coil and the second coil are wound around the first coil and the second coil, respectively. In another embodiment, a coil is wound around the third magnetic pole, and the swinging member is elastically biased to pivot at a predetermined rotational angle by an elastic member providing a rotational elastic force.

Next, embodiments of the shutter device for a camera of the present invention will be described in detail with reference to the accompanying drawings. The shutter device for a camera of the present invention includes at least two or more shutter blades for opening and closing a shutter opening, and an actuator for driving the shutter blades. 2 shows an actuator applied to a shutter device for a camera according to a first embodiment of the present invention. The illustrated actuator includes an approximately E-shaped yoke 120 and coils 131 and 132 wound around the yoke 120 and swings by an electromagnetic force generated in the yoke 120. The rotating shaft 151 is formed, the other end includes a rocking member 150 is a permanent magnet 155 is fixed.

The rocking member 150 is hinged to the mounting groove 115 formed on the base plate 160, one end of the rotating shaft 151, is rotatably mounted on the plate 160. A flat permanent magnet 155 is fixed to the other end of the rocking member 150. The yoke 120 facing the permanent magnet 155 is formed in an approximately E shape, and a third magnetic pole 123 is formed at the center of the yoke 120, and the first magnetic pole 121 and the second magnetic poles are formed on both sides thereof. 2 magnetic poles 122 are formed. The yoke 120 is formed of a magnetic material, and the first coil 131 and the second coil 132 are wound around the first magnetic pole 121 and the second magnetic pole 122 on both sides of the yoke 120, respectively. By applying current to the 131 and 132, an electromagnetic force is generated in the yoke 120, thereby driving the swinging member 150. The driving pin 152 is formed on the upper side of the permanent magnet 155. On the other hand, a shutter substrate 110 is disposed above the swinging member 150, and the driving pin 152 protrudes upward through a through hole 110 ′ formed in the shutter substrate 110.

Hereinafter, the driving of the actuator shown in FIG. 2 will be described with reference to FIGS. 3A to 3C. FIG. 3A illustrates a case in which a current is applied to the first coil 131 in the (+) direction and a current is not applied to the second coil 132 (non-energized state). In this case, the first magnetic pole 121 In the S polarity, the second magnetic pole 122 and the third magnetic pole 123, respectively, the N polarity is generated, and the permanent magnet 155 having the N polarity is opposed to the attraction of the first magnetic pole 121 and the second magnetic pole It rotates toward the 1st magnetic pole 121 by the repulsive force of the 122 and the 3rd magnetic pole 123. As shown in FIG. In this state, the first magnetic pole 121 of the rocking member 150 is attracted by the attraction force between the yoke 120 and the permanent magnet 155 of the magnetic material even when the magnetic flux is lost by cutting off the current communicating with the first coil 131. The turn to) remains the same.

FIG. 3B illustrates a case in which a current is applied to both the first coil 131 and the second coil 132 in the negative direction, and in this state, the first magnetic pole 121 and the second magnetic pole 122 are both N. FIG. The polarity, the S polarity is generated in the third magnetic pole 123, the permanent magnet 155 is located in the center of the yoke 120. In this state, the rocking member 150 may be caused by an attraction force between the yoke 120 and the permanent magnet 155 which are opposed to each other even when the currents communicating with the first magnetic pole 121 and the second magnetic pole 122 are blocked. Maintains the turning state to the third magnetic pole 123.

3C illustrates a case in which a current is not applied to the first coil 131 (non-energized state) and a current is applied to the second coil 132 in a positive direction. In this state, the first magnetic pole 121 is applied. And the third magnetic pole 123 has an N polarity, the second magnetic pole 122 has an S polarity, and the permanent magnet 155 has a repulsive force and a second force of the first magnetic pole 121 and the third magnetic pole 123. In response to the attraction of the magnetic pole 122, the magnetic pole 122 is turned in the direction of the second magnetic pole 122. Even in this state, even if the current of the second coil 132 is cut off, the swinging member 150 is maintained by the attraction between the yoke 120 and the permanent magnet 155 to the second magnetic pole 122.

As described above, the actuator of the present invention operates in a three-stage structure, whereby the shutter blades linked by the actuator adjust the shutter opening in three stages of opening, half-opening and closing.

4A to 4C show the operation of the shutter blades corresponding to FIGS. 3A to 3C, respectively. The driving pins 152 fixed to the permanent magnet and driven in three steps with the shutter blades 181 and 182 are respectively shown. The shutter blades 181 and 182 on both sides are driven while sliding along the guide slots 181 ″ and 182 ″ formed in the grooves, thereby adjusting the aperture ratio of the shutter opening 110 ″ formed in the shutter substrate 110. .

More specifically, as shown in FIG. 4A, when the drive pin 152 pivots in the direction of the first magnetic pole 121 (FIG. 3A), the drive pin 152 is guide slots 181 ″ and 182 ″. It will stop at one end of the slots 181``, 182 '' as it moves along. As a result, the shutter blades 181, 182 fully open the shutter opening 110 ″ while interlocking in a direction away from each other by the drive pin 152.

As shown in FIG. 4B, when the drive pin 152 pivots toward the third magnetic pole 123 of the yoke (FIG. 3B), the drive pin 152 is centered in the guide slots 181 ″ and 182 ″. The shutter blades 181 and 182 are thus interlocked toward each other such that the shutter opening 110 ″ is partially closed by the shutter blades 181 and 182, and the shutter blades 181 and 182 are closed. A part thereof is opened by the inlets 181 ', 182' formed on the opposing surface, and the shutter opening 110 'becomes half-open.

As shown in FIG. 4C, when the drive pin 152 pivots in the direction of the second magnetic pole 122 (FIG. 3C), the drive pin 152 moves to one end of the guide slots 181 ″ and 182 ″. Thus, the shutter blades 181 and 182 are interlocked toward each other while the shutter opening 110 ″ is completely closed by the shutter blades 181 and 182.

Hereinafter, an exposure operation of the shutter device will be described with reference to FIG. 5. Here, (A) and (B) are timing diagrams of the drive signals applied to the first coil and the second coil, respectively, and (C) is a timing diagram showing the opening / closing state of the shutter opening corresponding to the drive signal. The shutter device is kept in the initial half open state, and then the shutter opening is shifted from the half open state to the developed state by a positive pulse signal having a width of T1 in the first coil. When the positive pulse signal having the width of T3 is applied to the second coil after the initial exposure time T2 in the developed state, the shutter opening transitions from the developed state to the fully closed state. Thus, after the one-time photographing operation is completed and the T4 time has elapsed in the fully closed state, and the negative pulse signal having the width of T5 is applied to the first coil and the second coil, the shutter opening is initially released from the fully closed state. It will return to the set half state.

FIG. 6 shows a modification of the exposure operation shown in FIG. 5, wherein (A) and (B) are timing diagrams of driving signals applied to the first coil and the second coil, respectively, and (C) is driving. It is a timing chart of the opening / closing state of the shutter opening corresponding to a signal. When the shutter opening is initially set in a half-open state, and after a period of initial exposure time T1 ', T2' has elapsed, and a positive pulse signal having a width of T3 'is applied to the second coil, the shutter opening is turned off. Thus, one shooting operation is completed. After the time T4 'has elapsed in the fully closed state, if a negative pulse signal having a width T5' is applied to the first coil and the second coil, the shutter opening is returned to the half-open state.

7A to 7C illustrate modifications of the shutter blades illustrated in FIGS. 4A to 4C. As the driving pins 252 move to the first magnetic poles 221, the driving pins 252 are guide slots. Sliding to one end of 281``, 282 '', the shutter opening 210 '' formed on the substrate 210 is opened by the shutter vanes 281,282. As the drive pin 252 moves to the third magnetic pole 223 of the yoke, the drive pin 252 moves to the center of the guide slots 281, 282, and the shutter vanes 281, 282 overlap each other. The shutter opening 210 `` is blocked by interlocking in the losing direction. When the drive pin 252 pivots with the second magnetic pole 222, the drive pin 252 moves to one end of the guide slots 281 `` and 282 ``, and the shutter vanes 281 and 282 interlock so as to cross each other. The shutter opening 210 ″ is partially opened by the half opening 282 ′ formed in one shutter vane 282. In this way, by changing the shape of the shutter blades 281 and 282, the opening and closing states of the shutter opening 210 ″ according to the swing of the swinging member 250 can be made to correspond differently. That is, even if the drive pin 250 of the actuator is disposed at the same position on the guide slots 281 ″ and 282 ″, the shutter opening 210 ″ may be opened or closed depending on the specific shape of the shutter vanes 281 and 282. Can be.

FIG. 8 illustrates a modification of the actuator illustrated in FIG. 2. In this modification, the yoke 320 is not disposed in the horizontal direction but is disposed upright in the vertical direction. Permanent magnet 355 formed at one end is also disposed to have a magnet in the vertical direction opposite to the yoke (320). The arrangement structure of the yoke 320 may be made according to a design change in the space in which the actuator is mounted. In addition, the rotating shaft 351 is formed at one end, the permanent magnet 355 and the driving pin 352 is fixed to the other end of the matter about the rocking member 350, and the third magnetic pole 323 and both sides of the center Matters regarding the first magnetic pole 321 in which the first coil 331 and the second coil 332 are wound, the yoke 320 in which the second magnetic pole 322 is formed, and the base plate 360 and the through hole ( Matters for the shutter substrate 310 and the like on which the 310 'is formed are substantially the same as those described in the first embodiment. In addition, since the operation structure of the actuator shown in the same figure is substantially the same as what was demonstrated with reference to FIGS. 3A-3C, it abbreviate | omits here.

9 shows an actuator applicable to the shutter device according to the second embodiment of the present invention. The illustrated actuator includes a rocking member 450 mounted in the mounting groove 415 of the base plate 460 so as to be pivotable about the rotation shaft 451, and a plate-shaped permanent member fixed to one end of the rocking member 450. A magnet 455 and an E-shaped yoke 420 disposed to face the permanent magnet 455 are provided. Here, the first magnetic pole 421 and the second magnetic pole 422 are formed at both sides of the yoke 420, and the coil 433 is wound around the third magnetic pole 423 at the center of the yoke 420. A driving pin 452 is formed on the permanent magnet 455, and the driving pin 452 protrudes through a through hole 410 ′ formed in the shutter substrate 410.

In the present embodiment, the elastic member 475 is interposed between the rocking member 450 and the shutter substrate 410, wherein the elastic member 475, for example, the coil spring, is a rotation shaft 451 of the rocking member 450. Winding), the fixing pin 472 and the pressing pin 471 are disposed together between the elastic member 475 both open shafts. Here, the fixing pin 472 is fixed to the lower side of the shutter substrate 410 regardless of the swinging state of the rocking member 450, the pressing pin 471 is formed on the rocking member 450 is a rocking member ( 450).

10A to 10C show an operating state of the actuator shown in FIG. 9. As shown in FIG. 10A, when a positive current is passed through the coil 433, the N pole is generated at the third pole 423 and the S pole is formed at the first pole 421 and the second pole 422. Thus, the swinging member pivots in the direction of the first magnetic pole 421. As shown in FIG. 10B, when the coil 433 is kept energized without applying current, the rocking member is moved by the elastic member 475 which tends to arrange the fixing pins 472 and the pressing pins 471 in a row. 450 pivots to the center of yoke 420. As shown in FIG. 10C, when a negative current flows through the coil 433, S polarity is applied to the third magnetic pole 423, and N polarity is applied to the remaining first magnetic poles 421 and the second magnetic pole 422. As a result, the swinging member 450 pivots toward the second magnetic pole 422.

As a result, the swinging member 450 is driven in a two-stage structure by electromagnetic force, and the swinging member 450 is driven in a three-stage structure by including an elastic member 475 for positioning the swinging member 450 at the center of the yoke 420. do.

FIG. 11 shows a first modification of the actuator shown in FIG. 9. The illustrated actuator is formed such that the third magnetic pole 523 at the center of the yoke 520 and the first and second magnetic poles 521 and 522 on both sides thereof protrude upwards, and thus the permanent magnet of one end of the swinging member 520 ( 555 is also disposed directly above the yoke 520. That is, in FIG. 9, the permanent magnet is disposed to face the front side of the yoke, whereas in the present modification, the permanent magnet 555 is disposed to face the yoke 520. 12 shows a second modification of the actuator shown in FIG. 9. In the actuator shown in FIG. 9, the yoke 650 is vertically disposed in the vertical direction, and the plate-shaped permanent magnet 655 is disposed directly above the yoke 650 to face the yoke 650. As shown in Figs. 11 and 12, the structure and arrangement of the opposing yokes and permanent magnets can be changed according to the specific design of the space in which the actuator is mounted.

In addition, the rotation shaft (551, 651) is formed at one end shown in Figure 11 and 12, the permanent magnets (555, 655) and the driving pins (552, 652) fixed to the other end of the matters related to the first magnetic pole ( For yokes 520 and 620, including 521 and 621 and second poles 522 and 622, and third poles 523 and 623 with coils 533 and 633 wound therebetween, between the elastic members 575 and 675 and the elastic members 575 and 675. Matters relating to the fixing pins 572 and 672 and the pressure pins 571 and 671 disposed on the base plate, and the base plates 560 and 660 in which the mounting grooves 515 and 615 are formed, and the shutter substrates 510 and 610 in which the through holes 510 'and 610' are formed. And the like are substantially the same as described with reference to FIG. 9.

According to the shutter device for cameras of the present invention, the following effects can be achieved.

First, it is possible to reduce the size and manufacturing cost of the camera including the shutter device. Compared to the shutter apparatus according to the prior art, the shutter apparatus of the present invention reduces the number of components such as coils for inducing electromagnetic force, thereby making it possible to reduce the size of the shutter apparatus and to reduce manufacturing costs, and to increase the utilization space inside the camera. The function can be improved. In particular, since the shutter device of the present invention includes a flat permanent magnet that is relatively easy to manufacture, for example, the manufacturing cost of the shutter device can be reduced as compared with a conventional shutter device in which a circular permanent magnet is used.

Second, by performing the functions of the conventional shutter and the aperture with one actuator, the manufacturing cost of the camera is drastically reduced. The shutter device for a camera according to the prior art is driven in two stages of opening and closing of a shutter opening, so that a driving source of a shutter and an aperture is separately required. In the three-stage drive shutter device of the present invention, by performing both the shutter and the aperture function as a single drive source, the manufacturing cost of the shutter device and the camera including the same can be significantly reduced.

Third, by using the yoke of the magnetic material, even if the current is cut off by the coil wound around the yoke, the rocking member maintains its previous state. This means that the opening ratio is maintained even if the power supply is cut off while the shutter opening is open, half-open or closed, and it means that power consumption can be reduced without requiring a separate self-holding means.

Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (8)

A shutter device for a camera comprising at least two shutter blades for opening and closing a shutter opening, and an actuator for driving the shutter blades. The actuator is Yoke formed of magnetic material; At least one coil wound around a portion of the yoke and optionally in which current is communicated; And And a rocking member having a permanent magnet disposed opposite to the yoke at one end thereof and fixed to the other end thereof as a center of rotation, and swinging by an electromagnetic force acting between the opposing permanent magnet and the yoke. The method of claim 1, Guide slots are formed in the shutter blades, respectively, and drive pins are inserted in the guide slots in the permanent magnets, and the shutter pins are rotated about the rotation axis while the drive pins slide along the guide slots. The shutter device for a camera, which opens and closes a shutter opening. The method of claim 1, The shutter blades adjust the shutter opening in three stages of opening, half-opening and closing, and the swinging member for driving the shutter blades performs an intermittent swing at three different rotation angles respectively corresponding to the three stages. The shutter device for a camera characterized by the above-mentioned. The method of claim 1, Each coil wound around the yoke is for a camera, characterized in that it is placed in a positive current applied state to communicate in one direction, a negative current applied state to communicate in the opposite direction, and a non-energized state in which no current is communicated. Shutter device. The method of claim 1, The permanent magnet is a camera shutter device, characterized in that formed in a flat shape. The method of claim 1, The yoke is a camera shutter device, characterized in that formed in the E-shape including a first magnetic pole and a second magnetic pole formed on both sides of the third magnetic pole and the third magnetic pole in between. The method of claim 6, And a first coil and a second coil wound around the first magnetic pole and the second magnetic pole, respectively. The method of claim 6, A coil is wound around the third magnetic pole, and the swinging member is elastically biased to swing at a predetermined rotational angle by an elastic member providing a rotational elastic force.

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