JP2006184459A - Motor-driven diaphragm device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive motor-driven diaphragm device which can be small-sized. <P>SOLUTION: The motor-driven diaphragm device is equipped with a bottom board 1 having an aperture part 1a forming an optical path, a diaphragm blade 20 turning along the surface of the bottom board so as to switch a diaphragm opening degree for the optical path to be large or small, and a driving mechanism 50 selectively switching the diaphragm blade to a position where the diaphragm opening degree is large or a position where the diaphragm opening degree is small. The driving mechanism is constituted of a turning type movable piece 12, a spring 14 energizing the movable piece to a 1st position, and an electromagnet 20 arranged to be opposed to the side surface of the movable piece and attracting the movable piece 12 to a 2nd position against a spring. The movable piece and the diaphragm blade are directly connected, and the diaphragm blade opens the aperture part of the bottom board when the movable piece is displaced to the 1st position, and the diaphragm blade covers over the aperture part of the bottom board when the movable piece is displaced to the 2nd position. <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, and more particularly to an electric diaphragm device of a fixed diaphragm type. The motorized aperture device of the present invention also includes a shutter device that switches the optical path between the closed and open positions.

  In a conventional motorized diaphragm device, a rotor type that rotates a predetermined angle range is often used as an actuator (drive mechanism) that drives a diaphragm blade. 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 Generally, it is configured by an exciting coil and a yoke or the like fitted on the outer periphery of the frame member (see, for example, Patent Document 1).

  In the electric throttle device provided with this type of drive mechanism, since the coil is wound so as to surround the rotor, the coil tends to be large, and as a result, the entire throttle device tends to be large.

  Recently, cameras mounted on personal computers and mobile phones have been downsized, and the lenses used therefor have also become smaller, so there is an increasing demand for downsizing the mounted aperture device. In addition, cost reduction has been strongly demanded.

JP 2002-165432 A

  However, no matter how small each part is with the conventional structure, there is a limit to downsizing, and when considering parts production and assembly, etc., the cost will be high and it will be offered at the price requested by the market Was impossible.

  In consideration of the above circumstances, an object of the present invention is to provide an electric diaphragm device that can be reduced in size at low cost.

  An electric diaphragm device according to a first aspect of the present invention includes a base plate having an opening that forms an optical path, and a diaphragm blade that switches the aperture opening degree of the optical path between large and small by being moved along the plate surface of the base plate. And a drive mechanism that selectively moves the aperture blade to a position with a large aperture opening or a position with a small aperture, wherein the drive mechanism is located between two positions around a rotation fulcrum. A movable piece that is rotatably supported, a biasing means that biases the movable piece to one side of the two positions, and a coil that is arranged to face the side surface of the movable piece and energizes the coil. And an electromagnet that applies a suction force to the movable piece and displaces the movable piece to the other side of the two positions against the biasing force of the biasing means. A diaphragm blade displaces the movable piece to one of the two positions. When the aperture blade moves to one of the positions of the aperture opening large or small, and the movable piece is displaced to the other of the two positions, the aperture blade is It is connected so that it may move to one of the other small positions.

  The invention according to claim 2 is the electric throttle device according to claim 1, wherein a base end of the movable piece is rotatably supported by a pin as the rotation fulcrum, and the movable piece is supported by the movable piece. One aperture blade is directly connected so as to extend to the tip side of the lens.

  The invention of claim 3 is the electric throttle device according to claim 2, wherein the electromagnet is wound around the outer periphery of the iron core and different magnetic poles are generated at the front end and the rear end of the iron core by energization. And a yoke that is magnetically coupled to the rear end of the iron core and has its tip extended along the side of the coil to a position close to the front end of the iron core, The front end and the front end of the yoke are opposed to the side surface of the movable piece, and the pin is disposed at a position farthest from the central axis of the iron core and almost within the horizontal width range of the electromagnet. .

  According to a fourth aspect of the present invention, there is provided the electric throttle device according to the third aspect, wherein a bracket for supporting at least one end of the pin is integrally formed on the yoke.

  The invention according to claim 5 is the electric diaphragm device according to claim 4, wherein the bracket that supports the pin and the movable surface that is rotatably attached to the bracket by the pin, The base end portion of the aperture blade is sandwiched as a sliding material.

  A sixth aspect of the present invention is the electric throttle device according to the fifth aspect, wherein the pin is passed through a first mounting hole formed in a base end portion of the diaphragm blade, and the first attachment of the diaphragm blade is performed. The aperture blade and the movable piece are connected so as to rotate integrally by fitting a protrusion protruding on the end face of the movable piece into a second mounting hole formed at a position away from the hole. It is characterized by that.

  The invention of claim 7 is the electric diaphragm device according to any one of claims 2 to 6, wherein a straight line connecting the center of the opening of the ground plane and the center of the pin and the center axis of the electromagnet are provided. When the movable piece is attracted by the electromagnet, the diaphragm blades that are directly connected to the movable piece cover the opening of the base plate, and the attraction is released and the biasing means is set to be orthogonal to each other. The diaphragm blade is configured to open the opening of the main plate when the movable piece is displaced by the force of.

  The invention according to claim 8 is the electric diaphragm device according to claim 7, wherein the movable piece is displaced by the force of the urging means when the adsorption by the electromagnet is released, and the diaphragm blades are When the opening is opened, a stopper for defining a rotation limit of the movable piece is provided so as to limit the opening position to the side close to the center of the opening.

  According to the first aspect of the present invention, the driving mechanism for driving the diaphragm blades includes a rotary movable piece connected to the diaphragm blades, a biasing means for biasing the movable piece to one side, and a movable piece. It consists of an electromagnet that rotates to the other side against the force, and the electromagnet is placed at a position facing the side of the movable piece and the movable part is placed outside the electromagnet. Can be formed as small as possible, and the entire drive mechanism including the movable piece and the urging means can be miniaturized. Further, since the structure is simple and the number of parts and the number of assembly steps can be reduced, the cost can be reduced. Therefore, it can be used as a fixed aperture device or a shutter for small devices such as mobile phones. In addition, the combination of the electromagnet and the movable piece attracted by the electromagnet can reduce the operating area (swing angle) of the movable piece, so that the diaphragm blade can be directly attached to the movable piece for use. Further simplification of the structure can be achieved. If it is desired to increase the deflection angle of the diaphragm blades, a displacement magnifying mechanism that increases the amount of displacement of the movable piece and transmits it to the diaphragm blades may be provided between them.

  According to the second aspect of the present invention, the base end of the movable piece is rotatably supported by the pin, and is extended to the distal end side of the movable piece so that one diaphragm blade is directly connected to the movable piece 12, so that the structure is simple. However, a large displacement can be given to the diaphragm blade by a small displacement of the movable piece.

  According to the invention of claim 3, since the movable piece can be attracted with a strong force by the front end of the iron core of the electromagnet and the tip of the yoke adjacent thereto, the coil can be downsized accordingly. In addition, the pin that supports the base end of the movable piece is located at a position that is farthest from the center axis of the iron core and almost within the horizontal width range of the electromagnet. It can be transmitted to the movable piece as much as possible.

  According to the invention of claim 4, since the bracket for supporting the pin is integrally provided on the yoke, a simple structure with a small number of parts and easy assembly can be realized.

  According to the invention of claim 5, since both are made of metal, the base end portion of the diaphragm blade is sandwiched between the movable piece and the opposing surface of the bracket, which are likely to cause friction, as a sliding material. The operation of the movable piece and the aperture blade can be facilitated.

  According to the sixth aspect of the present invention, the diaphragm blade can be connected to the movable piece simply by fitting the two mounting holes provided in the diaphragm blade to the pin and the protrusion, so that accurate assembly can be easily performed. it can.

  According to the seventh aspect of the present invention, the straight line connecting the center of the opening of the base plate and the center of the pin and the central axis of the electromagnet are set in a relationship orthogonal to each other, and when the movable piece is adsorbed by the electromagnet, the diaphragm blade Covers the opening of the base plate, and when the suction is released, the diaphragm blades open the opening of the base plate, which can contribute to the compactness of the diaphragm device.

  According to invention of Claim 8, the stopper which prescribes | regulates the rotation limit of a movable piece in order to restrict | limit the open position when an aperture blade opens the opening part of a ground plane to the side as close as possible to the center of the opening part of a ground plane. Therefore, it is possible to contribute to downsizing of the diaphragm device while protecting the diaphragm blade from interference with other parts.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B are plan views showing the principle configuration of the drive mechanism of the electric diaphragm device of the embodiment, in which FIG. 1A is a diagram showing a state when the diaphragm is opened (the diaphragm opening is large), and FIG. It is a figure which shows the state at the time of small degree. 2 is a perspective view showing a specific configuration of the drive mechanism, FIG. 3 is a plan view showing the overall configuration of the electric diaphragm device, FIG. 4 is a cross-sectional view taken along arrows IV-IV in FIG. 3, and FIG. It is a VV arrow directional view of FIG.

  As shown in FIG. 3 to FIG. 5, the electric diaphragm device is configured to reduce the aperture of the optical path by rotating along the ground plane 1 having the opening 1 a that forms the optical path and the plate surface of the ground plane 1. One diaphragm blade 10 made of a resin film that is switched between large and small, and a drive mechanism 50 that selectively switches the diaphragm blade 10 to a position where the aperture is large or small.

  As shown in FIG. 4, the diaphragm blade 10 is accommodated in a recess 1 b on the upper surface of the base plate 1, and slides on a protrusion 5 that protrudes along the arcuate path on the bottom surface of the recess 1 b. It is equipped to do it. Then, after setting the diaphragm blade 10, the diaphragm blade protection cover 9 having an opening 9 a corresponding to the opening 1 a of the base plate 1 is mounted on the base plate 1.

  As easily shown in FIGS. 1 and 2, the driving mechanism 50 of the diaphragm blade 10 includes a movable piece 12 made of magnetic metal, a spring 14 (shown only in FIG. 1) as an urging means, and an electromagnet 20. It is configured. The movable piece 12 is supported so as to be rotatable between a first position shown in FIG. 1A and a second position shown in FIG. The pin 13 is disposed at the proximal end of the movable piece 12, and the diaphragm blade 10 is directly connected to the upper end surface of the movable piece 12 on the proximal end side so as to extend in the distal direction of the movable piece 12.

  As shown in FIG. 2, the diaphragm blade 10 is fixed to the movable piece 12 by passing a pin 13 for supporting the movable piece 12 through a first mounting hole 10 b formed at the base end of the diaphragm blade 10, and the diaphragm blade. This is done by fitting a projection 15 projecting from the upper end surface of the movable piece 12 into a second mounting hole 10c formed at a position away from the first mounting hole 10b in the distal direction.

  When the movable piece 12 is displaced to the first position shown in FIG. 1A by directly connecting the movable piece 12 and the diaphragm blade 10 in this way, the diaphragm blade 10 is opened to the opening 1a of the base plate 1. When the movable piece 12 is displaced to the second position shown in FIG. 1B, the aperture blade 10 covers the opening 1 a of the main plate 1. This diaphragm blade 10 is for a fixed diaphragm, and is located at the center of the opening 1a of the main plate 1 when the movable piece 12 and the diaphragm blade 10 are moved to the second position shown in FIG. Thus, it has the aperture 10a which consists of a small circular hole. Therefore, when the aperture blade 10 is in the first position (a), the aperture opening is large (fully open), and when the aperture blade 10 is in the second position (b), the aperture opening is small (fixed). Aperture).

  For example, the spring 14 shown for convenience in FIG. 1 is attached to the outer periphery of the pin 13 to urge the movable piece 12 in the direction of arrow A toward the first position. One electromagnet 20 is disposed so as to face the side surface of the movable piece 12, and applies an attractive force to the movable piece 12 by energizing the coil 21, thereby causing the movable piece 12 to resist the biasing force of the spring. It is provided so as to be rotated in the B direction and displaced to the second position (fixed aperture position) shown in FIG.

  The electromagnet 20 is magnetically coupled to the columnar iron core 22, the coil 21 wound around the outer circumference of the iron core 22 to generate different magnetic poles at the front end 22 a and the rear end 22 b of the iron core, and the rear end of the iron core 22. The front end 22a of the iron core 22 is extended along the side of the coil 21 to a position close to the front end 22a of the iron core 22, and the front end 22a of the iron core 22 and the front end 23a of the yoke 23 are Opposite the side.

  Further, as shown in FIG. 1, the pin 13 that supports the movable piece 12 is farthest from the central axis L <b> 1 of the iron core 22 (in the direction away from the opening of the ground plane 1) and within the range of the lateral width dimension D of the electromagnet 20. It is arranged at a position that almost enters. As shown in FIGS. 2 to 5, the yoke 23 disposed outside the coil 21 is integrally formed with a bracket 23 f that supports at least one end of the pin 13, and the pin hole formed in the bracket 23 f The end of the pin 13 is fitted. Similarly, the base end portion of the diaphragm blade 10 in which the first mounting hole 10 b is fitted to the pin 13 is sandwiched between the facing surfaces of the bracket 23 f and the movable piece 12 as a sliding material. The other end of the pin 13 is fitted in the recess 1h (see FIG. 5) on the ground plane 1 side.

  Moreover, in this diaphragm | throttle device, as shown in FIG. 1, the straight line L2 which connected the center 1c of the opening part 1a of the ground plane 1 and the center of the pin 13 and the center axis line L1 of the electromagnet 20 are set to the mutually orthogonal relationship. When the movable piece 12 is attracted by the electromagnet 20 and displaced to the second position as shown in FIG. 1B, the diaphragm blade 10 directly connected to the movable piece 12 opens the opening 1a of the base plate 1. When the cover 12 is released and the suction is released and the movable piece 12 is displaced to the first position by the force of the spring 14 as shown in FIG. 1A, the aperture blade 10 fully opens the opening 1a of the base plate 1. It has become.

  Further, as shown in FIG. 3, the base plate 1 is provided with a stopper 17 that defines a rotation limit of the movable piece 12 in the arrow A direction. This stopper 17 is released when the movable piece 12 is displaced in the direction of arrow A by the force of the spring 14 by releasing the attraction by the electromagnet 20 and the aperture blade 10 opens the opening 1 a of the base plate 1. Is limited to the side as close as possible to the center 1c of the opening 1a.

Next, the operation will be described.
In this electric diaphragm device, the drive mechanism 50 for driving the diaphragm blade 10 biases the movable movable piece 12 connected to the diaphragm blade 10 and the movable piece 12 to the first position (the diaphragm opening position). The spring 14 and the electromagnet 20 that rotates the movable piece 12 to the second position (fixed aperture setting position) against the urging force of the spring 14, and the electromagnet 20 is opposed to the side surface of the movable piece 12. Since the movable part is arranged outside the electromagnet 20, the coil 21 of the electromagnet 20 can be formed as small as possible unlike the conventional rotor type, and the movable piece 12 and the spring 14 are included. The entire drive mechanism 50 can be reduced in size.

  Further, since the structure can be simplified as compared with the rotor type, the number of parts and the number of assembling steps can be reduced to reduce the cost. Therefore, it is suitable for application as a fixed aperture device for small devices such as mobile phones. If the aperture 10a is eliminated, it can be used as a shutter device.

  Moreover, since it is a combination of the electromagnet 20 and the movable piece 12 attracted to the electromagnet 20, the operating area (swing angle) of the movable piece 12 can be reduced. For this reason, like this embodiment, the aperture blade 10 can be directly attached to the movable piece 12, and the structure can be further simplified. In order to increase the deflection angle of the diaphragm blade 10, a displacement magnifying mechanism that increases the amount of displacement of the movable piece 12 and transmits it to the diaphragm blade 10 may be provided between them.

  In addition, since the base end of the movable piece 12 is rotatably supported by the pin 13 and extends to the distal end side of the movable piece 12 so that one diaphragm blade 10 is directly connected to the movable piece 12, a simple structure. However, a large displacement can be given to the diaphragm blade 10 by a small displacement of the movable piece 12.

  Further, since the movable piece 12 can be attracted with a strong force by the front end 22a of the iron core 22 of the electromagnet 20 and the tip 23a of the yoke 23 adjacent thereto, the coil 21 can be downsized accordingly. Further, since the pin 13 that supports the base end of the movable piece 12 is arranged at a position that is farthest from the central axis L1 of the iron core 22 and substantially falls within the range of the lateral width dimension D of the electromagnet 20, the diaphragm device can be made compact. The attraction force of the electromagnet 20 can be transmitted to the movable piece 12 as much as possible.

  Further, since the bracket 23f for supporting the pin 13 is integrally provided on the yoke 23, a simple structure with a small number of parts and easy assembly can be realized.

  In addition, since both are made of metal, the base end portion of the diaphragm blade 10 is sandwiched between the opposed surfaces of the movable piece 12 and the bracket 23f, which are likely to cause friction, so that friction can be prevented. 12 and the diaphragm blades 10 can be operated smoothly.

  Further, since the diaphragm blade 10 can be directly connected to the movable piece 12 simply by fitting the two mounting holes 10b and 10c provided in the diaphragm blade 10 to the pin 13 and the protrusion 15, the assembly with high accuracy is easily performed. be able to.

  Further, a straight line L2 connecting the center 1c of the opening 1a of the base plate 1 and the center of the pin 13 and the central axis L1 of the iron core 22 of the electromagnet 20 are set to be orthogonal to each other, and the movable piece 12 is attracted by the electromagnet 20 The aperture blade 10 covers the opening 1a of the base plate 1 when it is released, and the aperture blade 10 opens the opening 1a of the base plate 1 when the suction is released, which contributes to the compactness of the aperture device. It ’s big.

  Further, a stopper that defines the rotation limit of the movable piece 12 so as to limit the opening position when the diaphragm blade 10 opens the opening 1a of the base plate 1 to the side as close as possible to the center 1c of the opening 1a of the base plate 1. Since 17 is provided, it is possible to contribute to downsizing the diaphragm device while protecting the diaphragm blade 10 from interference with other components.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a principle configuration of a drive mechanism of an electric diaphragm device according to an embodiment of the present invention, in which (a) is a diagram showing a state when a diaphragm is opened (a diaphragm opening is large), and (b) is a fixed diaphragm setting (a diaphragm opening). It is a figure which shows the state at the time of small degree. It is a perspective view which shows the specific structure of the drive mechanism of the aperture blade. It is a top view of the electric diaphragm apparatus of an embodiment. FIG. 4 is a cross-sectional view taken along arrow IV-IV in FIG. 3. FIG. 5 is a VV arrow view of FIG. 3 showing a part in cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ground plane 1a Opening part 1c Center of opening 10 Diaphragm blade 10b 1st attachment hole 10c 2nd attachment hole 12 Movable piece 13 Pin (rotation fulcrum)
14 Spring (biasing means)
17 Stopper 20 Electromagnet 21 Coil 22 Iron Core 22a Front End 22b Rear End 23 Yoke 23a Front End 23f Bracket 50 Drive Mechanism L1 Center Axis of Electromagnet (Center Axis of Iron Core)
L2 Straight line connecting the center of the opening of the main plate and the center of the pin

Claims (8)

A ground plane having an opening that forms an optical path;
A diaphragm blade that switches the aperture opening of the optical path to large or small by being moved along the plate surface of the base plate,
A drive mechanism that selectively moves the diaphragm blades to a position of a large aperture opening or a small position;
The drive mechanism is
A movable piece rotatably supported between two positions around a rotation fulcrum;
Biasing means for biasing the movable piece to one of the two positions;
The movable piece is disposed so as to face the side surface of the movable piece, and energizes the coil to apply a suction force to the movable piece. An electromagnet displaced to the other side;
With
When the movable piece and the diaphragm blade displace the movable piece to any one of the two positions, the diaphragm blade moves to either one of the aperture opening degree large or small, and An electric diaphragm characterized in that when the movable piece is displaced to one of the two positions, the diaphragm blades are connected so as to move to the other position of the large or small diaphragm opening. apparatus. The electric diaphragm device according to claim 1,
A base end of the movable piece is rotatably supported by a pin as the rotation fulcrum, and one diaphragm blade is directly connected to the movable piece so as to extend to a distal end side of the movable piece. Electric throttle device. The electric throttle device according to claim 2,
The electromagnet includes a columnar iron core, a coil that is wound around the outer circumference of the iron core and generates different magnetic poles at the front end and the rear end of the iron core when energized, and is magnetically coupled to the rear end of the iron core and has its tip A yoke extending along the side of the coil to a position close to the front end of the iron core,
The front end of the iron core and the tip of the yoke are opposed to the side surface of the movable piece,
The electric throttle device according to claim 1, wherein the pin is disposed at a position farthest from the central axis of the iron core and substantially within a width range of the electromagnet. The electric diaphragm device according to claim 3,
An electric throttle device, wherein a bracket for supporting at least one end of the pin is formed integrally with the yoke. The electric throttle device according to claim 4,
An electric motor characterized in that a base end portion of the diaphragm blade is sandwiched as a sliding material between opposing surfaces of a bracket supporting the pin and the movable piece rotatably attached to the bracket by the pin. Aperture device. The electric diaphragm device according to claim 5,
The pin is passed through the first mounting hole formed at the base end of the diaphragm blade, and the end surface of the movable piece is inserted into the second mounting hole formed at a position away from the first mounting hole of the diaphragm blade. An electric diaphragm device characterized in that the diaphragm blade and the movable piece are connected so as to rotate integrally by fitting a projection protruding upward. The electric throttle device according to any one of claims 2 to 6,
The straight line connecting the center of the opening of the ground plane and the center of the pin and the central axis of the electromagnet are set to be orthogonal to each other, and when the movable piece is attracted by the electromagnet, it is directly connected to the movable piece. Further, the aperture blade covers the opening of the ground plate, and the aperture blade opens the opening of the ground plate when the suction is released and the movable piece is displaced by the force of the urging means. An electric diaphragm device characterized by being made. The electric diaphragm device according to claim 7,
When the movable piece is displaced by the force of the biasing means by releasing the attraction by the electromagnet, and the aperture blade opens the opening of the main plate, the opening position is closer to the center of the opening. An electric aperture device characterized in that a stopper is provided to limit the rotation limit of the movable piece for limiting.

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