JP2006098625A - Motor-driven diaphragm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor-driven diaphragm device having reduced thickness and size of a drive mechanism, and where a stable operation is ensured by high drive force exerted on diaphragm vanes, and designing is facilitated by increasing the flexibility in the selection of the direction with which the drive mechanism is mounted. <P>SOLUTION: An actuator 40 for driving the two diaphragm vanes 20A and 20B includes: a needle 60, which is supported so as to freely swing around a swing support point P1 and has a permanent magnet 68 at one swing end P2 apart from the swing support point P1 and a drive pin at the other swing end P3 apart from the swing support point, the permanent magnet 68 having both magnetic poles, in the direction in which the needle 60 swings; a stator 50 which includes a coil for excitation and supplies power to the coil, thereby causing a magnetic force in the permanent magnet, and swinging the needle around the swing support point. The swing support point 1 of the needle 60 and the swing end P3 having the drive pin 63 are disposed outside an area surrounded by the coil, and the swing end P2, having the permanent magnet 68, is disposed inside the area surrounded by the coil 52. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric diaphragm device for a small camera mounted on a notebook computer, a mobile phone or the like. The electric throttle device of the present invention includes a device corresponding to a shutter device that switches the aperture opening degree between two positions of fully closed and fully opened.

  In this type of conventional electric diaphragm device, as an actuator (drive mechanism) for driving the diaphragm blades, a rotor type that rotates a predetermined angle range is often used. This type of actuator has a cylindrical permanent magnet and a drive pin at a position deviated from the center of rotation, a frame member that rotatably supports the rotor, and wound around the outside of the frame member An exciting coil and a yoke or the like fitted around the outer periphery of the frame member are used.

  In this case, the coil is usually wound so as to surround the rotating shaft of the rotor, which increases the size of the rotor in the direction of the rotating shaft. There was a problem that would become thick. Increasing the thickness of the motorized aperture device affects the thinning and miniaturization of the camera on which the motorized iris device is mounted.

Therefore, an actuator capable of reducing the thickness of the electric diaphragm device has been developed and disclosed in Patent Document 1.
7 and 8 show the configuration of the actuator described in Patent Document 1. FIG. This actuator has a permanent magnet 101 mounted in the middle of the free end side, and further includes a mover 100 having a drive pin 102 at its free end side tip, an exciting coil 110 wound around a bobbin 112, and a magnetic path. The actuator includes a stator 120 including a yoke 121 to be formed, and swings the mover 100 by energizing the coil 110 and takes out a driving force by the drive pin 102. The fulcrum 103 is arranged outside the area surrounded by the coil 112.

  According to this configuration, since the mover 100 swings around the swing fulcrum 103 outside the area surrounded by the coil 110, the area surrounded by the coil 110 of the mover 100 is thin and flat. The coil 110 can also be thinly and widely wound. Therefore, the actuator in the axial direction of the swing fulcrum 103 can be made thinner compared to the conventional case where a coil is wound around a rotor.

JP 2002-165432 A

  By the way, the conventional actuator shown in FIGS. 7 and 8 has the swing fulcrum 103 arranged outside the coil 110, so that it can be thinned. However, the permanent magnet 101 is mounted in the coil 110. Since the drive pin 102 is provided further ahead of the same free end inserted, the swing radius R1 of the drive pin 102 is inevitably much larger than the swing radius R2 of the permanent magnet 101, and as a result. There is a problem that the swinging force of the drive pin 102 (that is, the drive force applied to the aperture blade) becomes weak. In the illustrated example, since R1 is about twice as large as R2, the driving force acting on the driving pin 102 is about ½ of the swinging force acting on the permanent magnet 101 portion. Therefore, in some cases, the permanent magnet 101 and the coil 110 have to be increased in size as much as the driving force of the drive pin 102 decreases, and although the thickness can be reduced, the entire apparatus may be increased in size. is there.

  Further, in the conventional actuator, the direction in which the drive pin 102 is provided must be substantially the same as the permanent magnet 101 when viewed from the swing fulcrum 103. It cannot be changed greatly. In other words, the swinging direction of the drive pin 102 is almost the same as the swinging direction of the permanent magnet 101, and it is difficult to set the other direction. Therefore, when applied to an electric diaphragm device, when the swing direction of the drive pin 102 with respect to the blade is determined, the direction of the permanent magnet 101 and the direction of the coil 110 are naturally determined, and the degree of freedom in selecting the mounting direction of the actuator is increased. rare.

  In consideration of the above circumstances, the present invention can reduce the thickness and size of the drive mechanism and can stabilize the operation by exerting a high driving force on the diaphragm blades. An object of the present invention is to provide an electric throttle device that can increase the degree of freedom of selection and can facilitate the design.

According to a first aspect of the present invention, there is provided a ground plane having an opening for forming an optical path, and a ground plane plate disposed on one surface of the ground plane so as to face each other with the opening interposed therebetween Two diaphragm blades that are supported so as to be rotatable along the surface and are symmetrically rotated about the respective axes as fulcrums, thereby adjusting the aperture of the optical path formed by the opening, and the other of the base plate A drive pin that is inserted into both long holes formed in the overlapping portion of the two diaphragm blades through the ground plate and moving the drive pin, thereby moving the optical path A drive mechanism for driving the diaphragm blades to adjust the diaphragm, and an electric diaphragm device comprising:
The drive mechanism is swingably supported around a swing fulcrum, has a permanent magnet having both magnetic poles in the swing direction at one swing end away from the swing fulcrum, and the swing mechanism. A movable element having the drive pin at another oscillating end away from the fulcrum; and a coil for excitation, and energizing the coil to exert a magnetic force on the permanent magnet to A stator that swings around a swing fulcrum,
A region where the swing end of the movable element and the swing pin having the drive pin are arranged outside the region surrounded by the coil, and the swing end having the permanent magnet is surrounded by the coil It is arrange | positioned inside.

  A second aspect of the present invention is the electric throttle device according to the first aspect, wherein the shaft is configured to rotatably support the two diaphragm blades on or near a straight line passing through the drive pin and the swing fulcrum. The distance from the drive pin to each axis is set equal.

  According to a third aspect of the present invention, there is provided the electric throttle device according to the first or second aspect, wherein the drive pin is arranged in a direction intersecting with a straight line connecting the rocking end having the permanent magnet and the rocking fulcrum. The rocking | fluctuation end which has is arranged, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, since the swing fulcrum of the mover constituting the drive mechanism is provided outside the region surrounded by the coil, the apparatus in the axial direction of the swing fulcrum can be thinned. .

  Also, since the drive pin is provided not on the tip on the same oscillating end as the permanent magnet but on another oscillating end outside the coil, the oscillating radius of the driving pin is set to the dimension of the permanent magnet or coil. It can be set to any value without being restricted by. For example, the swing radius of the drive pin can be set smaller than the swing radius of the permanent magnet. Therefore, the swinging force acting on the drive pin can be made larger than the swinging force generated on the permanent magnet, and the swinging stroke of the drive pin becomes small, but the driving force can be set large. As a result, it is possible to reduce the size of the permanent magnet and the coil as much as the driving force can be increased, and it is possible to reduce the thickness and the size of the entire apparatus. Even if the swing stroke of the drive pin is reduced, this type of blade drive is particularly troublesome because it can be covered by the method of setting the distance between the shaft supporting the diaphragm blade and the drive pin. There is no.

  Further, the direction of arrangement of the drive pin (swinging end) with respect to the permanent magnet when viewed from the swinging fulcrum can be freely selected without being restricted by the coil. Therefore, the mounting direction of the drive mechanism can be arbitrarily set at the design stage, and the degree of freedom in design can be increased.

  According to the second aspect of the present invention, the driving force by the driving pin can be utilized to the maximum extent as the rotational force of the diaphragm blades, and transmission of useless force can be eliminated as much as possible. In addition, since the distance to the shafts that support the drive pin and the diaphragm blades is set equal, both diaphragm blades can be driven in good balance under the same conditions, and the blades of substantially the same shape face up and face down. It can also be arranged and used.

  According to the invention of claim 3, the swing direction of the drive pin can be changed by 90 degrees at the maximum with respect to the swing direction of the permanent magnet, for example. Therefore, by selecting the direction of the swing end having the drive pin, the arrangement of the drive mechanism combined with the diaphragm blade can be freely selected at the design stage according to the direction of the swing end.

  Hereinafter, an electric diaphragm device according to an embodiment of the present invention will be described. The motorized aperture device shown as this embodiment switches the optical path between two positions, fully open and fully closed, and can also be called a shutter device.

  FIG. 1 is a schematic plan view showing a state in which a blade presser cover is removed from the electric diaphragm device of the embodiment, FIG. 2 is a side sectional view with a blade presser cover attached, and FIG. 3 is a diagram showing a relationship between main parts. FIG. 4 is a plan view of a main plate, a blade, and a blade presser cover which are main parts, and FIG. 5 is a diagram showing a configuration of an actuator (drive mechanism) which is a main part. Is a cross-sectional view, and (b) is a front view as seen from the drive pin side.

  As shown in FIG. 1 to FIG. 4, this electric diaphragm device is schematically composed of a rectangular base plate 10, two diaphragm blades 20 </ b> A and 20 </ b> B made of an extremely thin material, an actuator 50, and a blade presser cover 90. The ground plane 10 has a shallow flat recess 11 for accommodating the diaphragm blades 20A and 20B on one side, and is positioned in the recess 11 to form a circular opening that forms an optical path. 12, a through hole 13 through which a drive pin 63 described later passes, and shafts 15 </ b> A and 15 </ b> B erected to support the diaphragm blades 20 </ b> A and 20 </ b> B. The shafts 15A and 15B are opposed to each other with the through hole 13 interposed therebetween. A hook 19 that engages the blade presser cover 90 is provided on the outer peripheral edge of the main plate 10.

  The diaphragm blades 20A and 20B are arranged in a recess 11 formed on one plate surface of the main plate 10 so as to face each other with the opening 12 interposed therebetween. Both diaphragm blades 20A and 20B have substantially the same shape, and are arranged with one side facing up and the other facing back. Each diaphragm blade 20A, 20B has a semicircular cutout 21 corresponding to the opening 12 of the base plate 10 at the front end side edge, and a circular hole 22 and a long hole 23 at the base end portion. By being fitted to the shafts 15A and 15B provided upright on the shaft 10, the shafts 15A and 15B are supported so as to be rotatable along the plate surface of the base plate 10 with the shafts 15A and 15B as fulcrums.

  The diaphragm blades 20A and 20B are rotated symmetrically with the shafts 15A and 15B as fulcrums, so that the optical path formed by the opening 12 is adjusted. The diaphragm blades 20A and 20B in this case are switched between two positions, a position where the optical path is fully closed and a position where the optical path is fully opened. The solid line in FIGS. 1 and 3 indicates the fully open position, and the two-dot chain line in FIG. 3 indicates the fully closed position. The blade presser cover 90 is engaged with the hook 19 at the periphery, thereby protecting the diaphragm blades 20A and 20B and preventing the blade cover from falling off. The blade pressing cover 90 is also provided with an opening 91 corresponding to the opening 12 of the main plate 10 and an opening 92 corresponding to the peripheral portions of the two shafts 15A and 15B.

  The actuator (drive mechanism) 40 includes a stator 50 and a mover 60, and is attached to a plate surface on the opposite side of the main plate 10. As shown in detail in FIG. 5, the stator 50 is fitted to the outer side of the bobbin 51 having a vertically split structure that also serves as a housing, the exciting coil 52 wound around the concave portion on the outer periphery of the bobbin 51. It consists of a yoke 80 (shown in FIG. 2), and a swinging space 53 of the mover 60 is secured inside the bobbin 51.

  The mover 60 is housed inside the bobbin 51 and is supported by the bobbin 51 so as to be swingable around a support shaft 62 provided as a swing support point P1, and a rectangular shape in which the support shaft 62 projects vertically. It consists of a frame-shaped resin main body 61 and a permanent magnet 68 having one end fitted to the main body 61. On the mover 60, a first oscillating end P2 that is separated from the oscillating fulcrum P1 and another second oscillating end P3 that is also away from the oscillating fulcrum P1 are provided. The permanent magnet 68 having both magnetic poles (N pole and S pole) in the swing direction is provided on the swing end P2, and the drive pin 63 is provided on the second swing end P3. When the coil 52 is energized, an N pole and an S pole are generated in a direction penetrating the bobbin 51 as indicated by arrows A and B in FIG. The mover 60 is swung by applying an electromagnetic force.

  As shown in FIG. 1, the drive pin 63 protrudes on the opposite surface through the through hole 13 of the main plate 10, and is inserted into both the long holes 23 formed in the overlapping portion of the two diaphragm blades 20A and 20B. Has been. Then, when the mover 60 is turned to one side and the drive pin 63 is swung, both the diaphragm blades 20A and 20B are turned relatively in the opening direction with the shafts 15A and 15B as fulcrums, and the mover is moved. When the drive pin 63 swings by rotating the 60 to the other side, the two diaphragm blades 20A and 20B are relatively rotated in the closing direction with the shafts 15A and 15B as fulcrums.

  Here, what is important is that, firstly, the second oscillating end P3 having the oscillating fulcrum P1 and the driving pin 63 of the mover 60 is disposed outside the region surrounded by the coil 52, and That is, the first rocking end P <b> 2 having the permanent magnet 68 is disposed inside the region surrounded by the coil 52.

  Second, shafts 15A and 15B that rotatably support the diaphragm blades 20A and 20B are arranged on or near a straight line passing through the drive pin 63 and the swing fulcrum P1. The distance from each axis 15A, 15B is set equal.

  Third, the drive pin 63 is provided in a direction intersecting with a straight line connecting the first swing end P2 having the permanent magnet 68 and the swing fulcrum P1 (in the direction of approximately 90 ° in this example). That is, the second swing end P3 is arranged.

With the above configuration, the following operational effects can be obtained.
That is, by providing the swing fulcrum P1 of the mover 60 constituting the actuator (drive mechanism) 40 outside the region surrounded by the coil 52, the electric diaphragm device is thin in the axial direction of the swing fulcrum P1. Is possible.

  Further, since the drive pin 63 is provided not on the tip on the same first swing end P2 as the permanent magnet 68 but on another second swing end P3 outside the coil 52, the drive pin 63 The swing radius R 1 of 63 (see FIG. 5A) can be set to an arbitrary value without being restricted by the dimensions of the permanent magnet 68 and the coil 52. For example, as in this example, the swing radius R 1 of the drive pin 63 can be set smaller than the swing radius R 2 of the permanent magnet 68. Therefore, the swinging force acting on the drive pin 63 can be made larger than the swinging force generated on the permanent magnet 68, and the drive force can be set large although the swinging stroke of the drive pin 63 is reduced.

  As a result, the permanent magnet 68 and the coil 52 can be miniaturized as much as the driving force can be increased, and the entire motorized diaphragm device can be miniaturized as well as being thinner. Even if the swing stroke of the drive pin 63 is reduced, in the case of this type of blade drive, the drive pin 63 is sufficiently covered by the way of setting the distance between the shafts 15A and 15B supporting the diaphragm blades 20A and 20B and the drive pin 63. So that it will not be a problem.

  Further, the direction of arrangement of the drive pin 63 (second oscillating end) relative to the permanent magnet 68 when viewed from the oscillating fulcrum P1 can be freely selected without being restricted by the coil 52. Therefore, the mounting direction of the actuator 40 can be arbitrarily set at the design stage. In this example, the swinging direction of the drive pin 63 is converted to approximately 90 degrees with respect to the swinging direction of the permanent magnet 68. Therefore, by selecting the direction of the swing end P3 having the drive pin 63, the arrangement of the actuator 40 combined with the diaphragm blades 20A and 20B can be freely selected at the design stage according to the direction of the swing end P3.

  For example, as in another embodiment shown in FIG. 6, the direction of the second oscillating end P3 is set 180 degrees opposite to the first oscillating end P2 including the permanent magnet 68, and the actuator 40 is It is also possible to attach.

  Further, since the shafts 15A and 15B that rotatably support the diaphragm blades 20A and 20B are arranged on or near the straight line passing through the drive pin 63 and the swing fulcrum P1, the drive force by the drive pin 63 is provided. Can be utilized to the maximum as the rotational force of the diaphragm blades 20A and 20B, and transmission of useless force can be eliminated as much as possible. In addition, since the distance between the drive pin 63 and the shafts 15A and 15B supporting the diaphragm blades 20A and 20B is set equal, both the diaphragm blades 20A and 20B can be driven in a balanced manner under the same conditions. Moreover, it is also possible to use blades having substantially the same shape arranged face up and face down.

  In the embodiment described above, the throttle opening is switched to the two positions (fully open and fully closed). However, a magnetic member (biasing member) that exerts a predetermined magnetic biasing force on the mover 60 or a mechanical member is shown. A spring or the like for applying an urging force may be added so that the aperture opening can be adjusted to an intermediate position by the balance between the urging force and the magnetic force. Moreover, it can also comprise so that the needle | mover 60 may be hold | maintained in a fixed position by those energizing means at the time of a non-energization.

It is a schematic plan view which shows the state which removed the blade | wing presser cover of the electrically-driven diaphragm | throttle device of embodiment of this invention. It is a sectional side view in the state where the blade presser cover of the electric diaphragm device was attached. It is sectional drawing seen from the same direction as FIG. 1 which shows the relationship between the main components of the same electric aperture device. It is a top view of the main plate, blade | wing, and blade | wing presser cover which are the main components of the same electric aperture device. It is a figure which shows the structure of the actuator (drive mechanism) which is the main components of the electric aperture device, (a) is sectional drawing, (b) is the front view seen from the drive pin side. It is a schematic plan view of other embodiment of this invention. It is a disassembled perspective view which shows the example of the actuator for the conventional electrically-driven diaphragm | throttle device (shutter apparatus). It is a cross-sectional view of the same actuator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ground plate 12 Opening part 15A, 15B Axis 20A, 20B Diaphragm blade 23 Long hole 40 Actuator (drive mechanism)
50 Stator 52 Coil 60 Movable Element 63 Drive Pin 68 Permanent Magnet P1 Oscillation Support Point P2 First Oscillation End P3 Second Oscillation End

Claims (3)

A ground plane having an opening that forms an optical path;
It is arranged on one plate surface of the main plate so as to be opposed to each other with the opening interposed therebetween, and is supported by a shaft so as to be rotatable along the plate surface of the main plate, and is symmetrical about each of the shafts. And two diaphragm blades that adjust the aperture of the optical path formed by the opening,
A drive pin that is disposed on the other plate surface of the base plate and is inserted into both elongated holes formed in the overlapping portion of the two diaphragm blades through the base plate, and the drive pin is moved; A drive mechanism for driving the diaphragm blades to adjust the aperture of the optical path,
The drive mechanism is
It has a permanent magnet having both magnetic poles in the swinging direction at one swinging end that is supported swingably around the swinging fulcrum and is separated from the swinging fulcrum, and is separated from the swinging fulcrum. A mover having the drive pin at another swing end;
A stator that includes a coil for excitation, and applies a magnetic force to the permanent magnet by energizing the coil to swing the movable element around the swing fulcrum,
A region where the swing end of the movable element and the swing pin having the drive pin are arranged outside the region surrounded by the coil, and the swing end having the permanent magnet is surrounded by the coil An electric aperture device characterized in that it is arranged on the inside of the motor.   The shaft for rotatably supporting the diaphragm blades is arranged on or near a straight line passing through the drive pin and the swing fulcrum, and the distance from the drive pin to each of the shafts is set equal. The motorized throttle device according to claim 1, wherein:   The rocking end having the drive pin is arranged in a direction intersecting with a straight line connecting the rocking end having the permanent magnet and the rocking fulcrum. Electric throttle device.

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