JP2004334039A - Electromagnetic driving device and light quantity adjusting device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic driving device where a coil frame incorporating a magnet rotor is easily worked, and mechanical loss such as friction is hardly caused in the bearing part of the rotary shaft of the rotor and which obtains smooth motion. <P>SOLUTION: The coil frame 1 inside which the magnet rotor 3 is incorporated and whose outer periphery a coil 4 is wound round is constituted of half-cut coil frames 1a and 1b divided right and left through the rotary shaft 7 of the rotor 3, and a bearing recessed part 10 supporting one end of the rotary shaft 7 of the rotor 3 is provided on either coil frame 1b, and a bearing recessed part 11 supporting the other end of the rotary shaft is provided on the other half-cut coil frame 1a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic drive device that rotatably accommodates a magnet rotor made of a permanent magnet in a coil frame having a coil wound around its outer periphery, and rotates the magnet rotor by applying a DC current to the coil, and this magnet rotor. The present invention relates to a light amount adjusting device that adjusts the light amount of an optical imaging device with a rotational force generated in the optical device.
[0002]
[Prior art]
[Patent Document 1] Japanese Utility Model Registration No. 2606159 Generally, an optical imaging device such as a video camera or a still camera has a shutter blade that blocks light in a lens barrel in which an imaging lens is incorporated, or a diaphragm that adjusts the amount of imaged light. The amount of light is controlled by arranging the blades. These blade members are rotatably or slidably incorporated in the imaging optical axis in the lens barrel, and are driven and controlled by an electromagnetic driving device.
[0003]
In this electromagnetic drive device, a magnet rotor is rotatably housed in a coil frame around which a conductive coil is wound on the outer periphery, and the rotation of the magnet rotor is transmitted to a blade member to open / close the imaging optical axis or to increase or decrease the opening diameter. Adjustments are made. In other words, a structure is widely adopted in which a magnet rotor is magnetized with N-S2 poles and a rotor is rotated by a magnetic field generated in the coil by passing a DC current through a coil wound therearound.
[0004]
Therefore, this electromagnetic drive device manufactures a hollow cylindrical coil frame from resin or the like, and rotatably supports and houses a magnet rotor integrally provided with a rotating shaft inside the coil frame, and a blade member from the rotating shaft. The transmission arm is configured to transmit the torque.
Therefore, the coil frame is divided into two parts so as to incorporate the magnet rotor therein. After the rotor is housed inside, the two are united and the coil is wound around the outer periphery.
The coil frame may be divided into two parts vertically divided into left and right via the rotation axis of the magnet rotor, and two parts divided vertically and horizontally into the direction perpendicular to the rotation axis to Sakai. ing.
[0005]
In the former vertically split structure, even if the diameter of the coil frame is reduced due to the miniaturization of the device, the two half-cut coil frames are combined (coupled) in the vertical direction, which is usually the longitudinal direction. And the magnet rotor can be easily incorporated into the interior.
However, when the rotating shaft of such a magnet rotor is vertically divided into left and right sides in Sakai, there is a problem in molding the bearing portion.
Conventionally, as proposed in the above-mentioned Patent Document 1, a bearing recess is formed in each of the half-cut coil frames, and the two are united to support the rotary shaft as a bearing.
[0006]
[Problems to be solved by the invention]
As described above, the recesses for bearings are formed in each of the half-cut coil frames, and when the two coil frames are combined to support the rotating shaft of the magnet rotor, a positional deviation occurs when the two recesses are combined with the processing accuracy of the two recesses. Occurs, smooth movement of the magnet rotor cannot be obtained.
In particular, with the recent miniaturization of the equipment, the rotating shaft of the rotor has a diameter of about 1 mm, and the bearing needs to be finely machined. Also, due to power consumption, the bearing of the rotating shaft suffers from mechanical loss such as frictional force. Less structure is required.
[0007]
SUMMARY OF THE INVENTION Accordingly, it is a main object of the present invention to provide an electromagnetic drive device that can easily process a coil frame having a built-in magnet rotor and that can produce smooth motion with little mechanical loss in a bearing portion of a rotating shaft.
[0008]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION In order to solve the above-described problems, the present invention is configured such that when forming a coil frame by combining two half-cut coil frames, a bearing recess supporting one end of a rotating shaft of a magnet rotor is provided on one of the half-cut coil frames. This is based on the knowledge that a bearing recess for supporting the other end of the rotating shaft is provided in the other half of the coil frame.
[0009]
The invention according to claim 1 is a hollow cylindrical coil frame, a cylindrical magnet rotor rotatably built in the coil frame and having a rotation axis at the center, and a rotation of the magnet rotor attached to the rotation axis. A transmission member for outputting to the outside of the coil frame, and a coil wound around the outer periphery of the coil frame, wherein the cylindrical coil frame is divided into left and right parts in the vertical direction via the rotation shaft of the magnet rotor. A bearing recess for supporting one end of the rotary shaft on one side of the half-shaped coil frame, and a bearing recess for supporting the other end of the rotary shaft on the other side of the half-shaped coil frame. The configuration of the electromagnetic drive device formed respectively,
As a result, when the two half-cut coil frames are connected, they can be combined without displacement at the cylindrical connecting surface in the axial direction, and the rotating shaft of the magnet rotor is manufactured separately for each half-cut coil frame. The biting phenomenon caused by joining the two bearing recesses is eliminated. Thus, it is easy to manufacture a small device.
[0010]
According to a second aspect of the present invention, in the configuration of the first aspect, the bearing concave portion of the half-cut coil frame is formed so as to bulge toward the other half-cut coil frame to be joined. It is easy to locate the bearing recess at the center of the coil frame. In particular, when the coil frame is manufactured in a cylindrical shape having the same diameter, the position of the bearing recess can be determined at the center thereof based on the outer dimensions, which facilitates manufacture.
[0011]
According to a third aspect of the present invention, in the configuration of the first aspect, both ends of the rotating shaft are formed in a sharpened shape, and the bearing concave portion is constituted by a pivot bearing, so that the magnet rotor is supported in a pivotal shape and smoothly. Movement is possible, and at the same time, the pivot-shaped bearing recess is formed separately in the two half-cut coil frames, so that the machining is easy.
[0012]
According to a fourth aspect of the present invention, in the configuration of the first to third aspects, the coil is wound in a direction intersecting a coupling surface between upper and lower end surfaces of the two coil frames. Thus, the coil frame formed by joining the two half-cut coil frames has a groove formed by the coupling surface, whereas the coil is wound in a direction crossing the coupling surface (groove) to break the coil wire. Can be prevented.
[0013]
According to a fifth aspect of the present invention, there is provided a substantially hollow cylindrical coil frame, a cylindrical magnet rotor having a rotation axis at the center, and a pair of opposed magnets provided in the coil frame to rotatably support the rotation axis. A bearing recess groove, a transmission member attached to the rotation shaft and transmitting the rotation of the magnet rotor to the outside of the coil frame;
An electromagnetic drive device comprising: a coil wound around the outer periphery of the coil frame;
The cylindrical coil frame is formed by joining two half-cut coil frames divided into left and right in the vertical direction via the rotation shaft of the magnet rotor, and the transmission member is provided on a joint surface of the two half-cut coil frames. A pivot bearing for forming an opening projecting out of the coil frame and for supporting one end of the rotary shaft on one of the half-shaped coil frames and a pivot bearing for the other end of the rotary shaft on the other of the half-shaped coil frames; With the configuration of the electromagnetic drive device in which the bearings are formed, it is possible to obtain the same result as the first aspect of the present invention.
[0014]
According to a sixth aspect of the present invention, there is provided a substrate having an optical axis opening, a blade member attached to the substrate for adjusting the light amount of the optical axis opening, a hollow cylindrical coil frame attached to the substrate, and the coil frame. A cylindrical magnet rotor rotatably built in and having a rotation axis at the center, a transmission member attached to the rotation shaft and transmitting the rotation of the magnet rotor to the blade member,
In a light quantity adjusting device including a coil wound around the outer periphery of the coil frame,
One end of the rotating shaft is supported on one of the half-cut coil frames by combining the two half-cut coil frames obtained by dividing the cylindrical coil frame into left and right parts in the vertical direction via the rotation shaft of the magnet rotor. Bearing recess to be formed, the configuration of the light amount adjusting device in which the bearing recess for supporting the other end of the rotary shaft is formed in the other half of the half-shaped coil frame,
As a result, a coil frame having a built-in magnet rotor and a coil wound around the outer periphery is easy to manufacture and can be made more compact, so that a light amount adjusting device using this can be made smaller and less expensive. It becomes possible.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
FIG. 1 is a perspective view of an electromagnetic drive device according to the present invention, FIG. 2 is an exploded view thereof, FIG. 3 is a top and bottom view of a coil frame, and FIG.
[0016]
The electromagnetic drive device of the present invention is wound around a coil frame 1 formed in a hollow shape, a magnet rotor 3 rotatably supported in an internal cavity 2 of the coil frame 1, and an outer periphery of the coil frame 1. It comprises a coil 4, a transmission member 6 attached to the magnet rotor 3 for transmitting the rotation of the magnet rotor 3 to the outside, and a yoke 5 covering the outer periphery of the coil frame 1.
The coil frame 1 is formed by molding a synthetic resin to form a hollow portion 2 in which a magnet rotor 3 described later is built and a winding margin for winding the coil around the outer periphery.
[0017]
The illustrated coil frame 1 is formed by combining two half-cut coil frames 1a and 1b each having a hollow cylindrical shape and divided into left and right directions along an axis (XX).
The two half-cut coil frames 1a and 1b obtained by dividing the coil frame in this manner are intended to facilitate the processing for forming the hollow portion 2 therein and to manufacture the magnet rotor 3 into the hollow portion 2. This is to make it easier.
The reason why the coil frame 1 is divided right and left in the axial direction is to reduce the displacement by connecting the half-cut coil frames 1a and 1b in the longitudinal direction of the axis in order to reduce the radial direction of the coil frame 1 by downsizing the apparatus. .
[0018]
In other words, in order to reduce the lens barrel of a camera device or the like to a small diameter, it is necessary to reduce the size of light quantity adjusting devices such as shutter blades and aperture blades located on the photographing optical axis to a small diameter. The device also needs to be miniaturized so that it does not protrude as much as possible in the radial direction from the photographing optical axis.
The illustrated coil frame 1 is reduced in size to an outer diameter of 4 mm and an axial length of 8 mm. By dividing the coil frame 1 in a half axial direction, the half-cut coil frames 1a and 1b can be combined with a large joining surface. Can be reduced.
[0019]
8a is a joint surface formed by the peripheral edge of the peripheral wall of the half-cut coil frame 1a, and 8b is a joint surface provided on the edge of the upper and lower end surfaces. Similarly, the joint surface formed on the other half-cut coil frame 1b is formed. The surfaces and the illustrations 8a and 9a, 8b and 9b are configured to be joined to each other.
It should be noted that FIG. 13 shows a positioning boss (projection) provided on the joining surface 8a, and a hole adapted to this is provided on the other joining surface 9a, and FIG. 14 shows a positioning hole provided on the joining surface 8a. The surface 9a is provided with a projection adapted to this.
[0020]
The magnet rotor 3 includes a permanent magnet 3a and a rotating shaft 7 provided at the center of the permanent magnet 3a.
The permanent magnet 3a is formed by molding a magnetic material into a cylindrical shape by sintering and magnetizing the NS poles.
As shown in FIG. 2, the magnetizing direction of the permanent magnet 3a is magnetized so that the N-pole and the S-pole oppose each other on the circumferential surface of the column at an interval of 180 degrees, and a through hole is formed in the center. The rotary shaft 7 is press-fitted into this through hole and fixed with an adhesive.
[0021]
The rotating shaft 7 is formed of a synthetic resin rod-shaped member, and both end portions 7a and 7b are supported by bearing recesses (described later) formed in the hollow portion 2 of the coil frame 1.
A transmission member 6 is formed integrally with the rotating shaft 7 in a direction perpendicular to the axial direction, and the transmission member 6 is configured to transmit the rotation of the magnet rotor 3 to the outside.
The transmission member 6 may be formed integrally with the rotating shaft 7 by molding a resin or the like, or may be formed separately and then integrated with an adhesive or a press-fitting method.
[0022]
A pin 6a is implanted in the transmission member 6, and the pin 6a is engaged with a light amount adjusting blade (shutter blade, aperture blade) described later.
The half-cut coil frames 1a and 1b are provided with bearing recesses 10 and 11 for bearing the rotary shaft 7 of the magnet rotor 3 at the same time as the cavity 2 for housing the magnet rotor 3.
In the case where a conventional cylindrical coil frame is divided vertically into left and right via a central axis, U-shaped cutout grooves are respectively provided on the end faces of the left and right coil frames, and both are united to rotate the rotary shaft 7 from both sides. The structure which supports so that it may be pinched is employ | adopted. However, in a recent apparatus in which the diameter of the coil frame is reduced to 5 mm or less, the diameter of the rotating shaft is about 1 mm. Combining and supporting the left and right U-grooves so that the rotary shaft 7 rotates smoothly makes the production of the half-cut coil frames 1a and 1b difficult, especially the dimensional accuracy of each part.
[0023]
In combination with such a problem, if a pivot bearing structure is employed to reduce the mechanical loss of the bearing portion, it becomes impossible to manufacture with a conventional structure.
In other words, when the tip of the rotating shaft is sharpened, for example, at 60 degrees, the bearing recess must be formed in a triangular pyramid shape suitable for this rotating shaft. It is considered impossible to machine the conical shape.
[0024]
Therefore, in the illustrated embodiment, a bearing recess 10 for bearing one end 7a of the rotating shaft 7 is formed on the first half-cut coil frame 1a side, and a bearing recess 11 for bearing the other end 7b of the rotating shaft 7 is formed in a second half-shape. It is formed on the coil frame 1b side.
A swelling portion 10a is formed on the upper end surface of the second half-shaped coil frame 1b, and a bearing recess 10 having a through hole is formed in the swelling portion 10a. On the upper end surface of the other first half-cut coil frame 1a, a concave portion 11 that fits the bulging portion 10a is formed.
One end 7a of the rotating shaft 7 of the magnet rotor 3 is supported by the bearing recess 10 of the second half coil frame 1b.
Similarly, a bulged portion 11a and a bearing recess 11 are formed on the lower end surface of the first half-shaped coil frame 1a, and the bulged portion 11a is formed on the lower end surface of the other second half-shaped coil frame 1b. A matching recess (not shown) has been formed.
[0025]
Thus, the bearing recess 10 supporting one end 7a of the rotating shaft 7 is provided in the second half-cut coil frame 1b, and the bearing recess 11 supporting the other end 7b of the rotating shaft 7 is provided in the other first half-cut coil frame 1a. The reason for this is to facilitate the assembly of the magnet rotor 3 at the same time as the two half-cut coil frames 1a and 1b are combined.
A coil 4 is wound around the coil frame 1 in a direction orthogonal to (not necessarily orthogonal to, but intersecting with) the magnetizing direction (circumferential direction) of the permanent magnet 3a of the magnet rotor 3.
The outer periphery of the coil frame 1 is provided with a concave groove 12 for forming a winding margin of the coil.
[0026]
An opening 15 for projecting the transmission member 6 to the outside is provided on the peripheral side surface of the coil frame 1. The joining surface 9a of the half-cut coil frame 1b is formed by a notched slit-shaped opening 15b.
[0027]
Therefore, according to the present invention, when the coil 4 is wound around the outer periphery of the coil frame 1, a groove 17 shown in FIG. 3 is formed on the surface where the two half-cut coil frames 1 a and 1 b are joined. It is formed in the whole area. Conventionally, the coil is wound so as to avoid the groove generated by this joining so that the coil wire is not broken by the groove.
[0028]
Therefore, conventionally, a coil is individually wound around each of the half-cut coil frames 1a and 1b and one coil is formed by connecting the wire ends of the two coils. Therefore, a band-shaped coil is wound around the center of the coil frame 1. Impossible joints are formed. In order to obtain a predetermined output by this joint portion, the diameter of the coil frame must be configured to be large to secure the winding allowance of the coil, causing an increase in the size of the device.
In the illustrated embodiment, the coil is wound in the direction crossing the linear groove formed by the above-described joining, so that the coil can be wound over the entire area of the coil frame without fear of disconnection.
As a result, a high output can be obtained with the configuration of the coil frame having the same diameter, and the diameter of the coil frame can be made smaller with the device configuration having the same output, thereby achieving downsizing.
[0029]
As described above, the concave groove 12 is provided on the outer periphery of the coil frame 1 in a direction intersecting (in the drawing, perpendicular to) the joining surface of the half-cut coil frames 1a and 1b, and the coil 4 is wound.
In FIG. 5, a yoke is formed in a ring of a soft magnetic material and is fitted to the coil frame 1 so as to cover the outer periphery of the coil frame 1, and shields the magnetic flux leaking from the magnet rotor 3.
[0030]
Next, a light amount adjusting device using the above-described driving device M will be described.
FIG. 6 shows a camera aperture device, and FIG. 7 shows a camera shutter device.
In a photographing device such as a video camera, a still camera, and a digital camera, a shutter device that controls exposure time by opening and closing light from a subject or an aperture that controls exposure amount by regulating the amount of light from the subject. A device is needed.
[0031]
The diaphragm device shown in FIG. 6 is arranged in the photographing optical axis Y-Y of the lens barrel, and diaphragm blades 22 and 23 are incorporated between a pair of substrates 20 and 21, and the blades 22 and 23 are controlled by an electromagnetic driving device M. It has become.
The substrate 20 is formed by resin molding, and has an optical axis opening 24 at the center. The aperture blades 22 and 23 are formed of a synthetic resin film member, and the distal end portion facing the optical axis opening 24 has a constricted shape as shown in the drawing, and slides in the left-right direction in FIG. It is supported as follows. In FIG. 25, a long hole provided in the blade 23 is fitted to a pin (not shown) planted on the substrate 20. Reference numeral 26 denotes an elongated hole provided in the blade 24, which is fitted and supported by a pin of the substrate 20.
[0032]
Therefore, the blades 23 and 24 are slidably supported between the substrate 20 and the substrate 21 by guide ribs (not shown) and pins fitted in the elongated holes 25 and 26.
Then, the leading end 22a of the blade 22 and the leading end 23a of the blade 23 facing the optical axis opening 24 adjust the amount of photographing light.
The driving device M of the blades 22 and 23 is configured such that the transmission member 6 of the magnet rotor 3 is attached to the rotating shaft 7 so that the arm portions 6b protrude to the left and right sides, and each has a transmission pin 6a. Therefore, the transmission member 6 is attached to the rotating shaft 7 in a T-shape, the arm portion 6b of the electric member 6 protrudes from both sides 180 degrees away from the peripheral side surface of the coil frame 1, and an engagement pin 6a is provided at the tip thereof. I have.
[0033]
Therefore, a long hole 27 is provided at the base end of the blade 22, and a long hole 28 is provided at the base end of the blade 23, and the transmission pin 6 a of the transmission member 6 is engaged with the long holes 27 and 28. It has become.
In the electromagnetic driving device M, a rib 19 is provided integrally with the coil frame 1 at an appropriate position on the outer periphery of the coil frame 1, and a mounting groove 29 for fitting the rib 19 is provided in the substrate 20. Accordingly, the driving device M is mounted on the substrate 20 by fitting the rib 19 into the mounting groove 29 of the substrate 20, and the transmission pin 6 a of the transmission member 6 is connected to the elongated hole 27 of the blade 23 through the slit 30 formed in the substrate 20. And the blade 22 is fitted into the long hole 28.
[0034]
The aperture device configured as described above is set so that the magnet rotor 3 is located at the initial position (home position) of the minimum aperture position or the maximum aperture position, and is provided with a position sensor that detects the rotational position of the magnet rotor 3 at the same time. Have been.
For setting to the initial position, a method of always biasing in the closing direction or the opening direction by a spring such as a close spring or a magnetic attraction means is adopted.
In the case of using a spring, a winding spring may be provided between the substrate 20 and the transmission member 6, and in the case of using a magnetic attraction means, a soft magnetic member (for example, an iron pin) is provided near the rotation region of the magnet rotor 3 and always. What is necessary is just to urge the magnet rotor 3 to rotate in one direction.
Further, the position sensor of the magnet rotor 3 may be configured such that a Hall element is incorporated in the cavity 2 of the coil frame 1 so as to detect the magnetic flux of the permanent magnet 3a.
[0035]
Therefore, a current is supplied to the coil 4 upon receiving a setting signal of a predetermined exposure amount from the camera control unit. Then, the magnet rotor rotates by the magnetic field generated in the coil 4, and the transmission member 6 attached to the rotating shaft 7 also rotates. By the rotation of the transmission member 6, the blade 22 and the blade 23 slide in the opposite direction, and the tip portions 22a and 23a of the blade move in the opposite direction to adjust the amount of light passing through the optical axis Y-Y.
The rotation of the magnet rotor 3 is detected by a position sensor such as a Hall element, and the current supplied to the coil 4 is adjusted so that when the magnet rotor 3 rotates to a set position, it is held at that position.
[0036]
Next, the shutter device shown in FIG. 7 will be described.
A pair of substrates 31, 32 are arranged on the photographing optical axis YY similarly to the above-described diaphragm device, and shutter blades 34, 35 and an electromagnetic driving device M2 are incorporated in the substrates 31, 32.
The substrates 31 and 32 are formed of plate members having a small gap, and an optical axis opening 33 is provided around the optical axis Y-Y. The substrate 31 is manufactured by molding a synthetic resin, and the substrate 32 is a thin metal plate attached to the substrate 31 as a holding plate.
[0037]
On the substrate 31, vanes 34 and 35 formed of a plastic film are supported at their base ends by pins 36 implanted in the substrate 31.
The tips of the blades 34 and 35 rotate in opposite directions about the pin 36 so as to open and close the optical axis opening 33.
Elongated slits 37, 38 are provided at the base end portions of the blades 34, 35, and the slits 37, 38 are arranged at inclined and overlapping positions so as to cross each other.
On the other hand, ribs 19 are provided on the coil frame 1 of the driving device M2 at appropriate locations on the outer periphery of the coil frame, and mounting grooves 40 for fitting and fixing the ribs 19 are provided on the substrate 31.
[0038]
In the driving device M2 mounted in the mounting groove 40 of the substrate 31, the transmission pin 6a of the transmission member 6 of the magnet rotor 3 engages with the slits 37, 38 of the blades 34, 35 via the elongated hole 39 of the substrate 31. It has become.
Although not shown, a coil spring is bridged between the transmission member 6 and the substrate 31 and constantly urges the blades 34 and 35 in the closing direction.
Then, when a DC current is applied to the coil 4 in response to a timing signal from the camera control unit, the magnetic field generated in the coil 4 causes the magnet rotor 3 to rotate in a predetermined direction and the transmission member 6 to rotate in the same direction.
The rotation of the transmission member 6 is transmitted to the shutter blades 34 and 35 via the transmission pin 6a, and the blades 34 and 35 rotate around the pin 36 in the opposite direction to open the optical axis opening 33.
Next, when the energization of the coil 4 is cut off in response to a signal from the camera control unit, the blades 34 and 35 are closed by the urging force of the coil spring.
[0039]
【The invention's effect】
The present invention has the above-described configuration, and comprises a coil frame in which a magnet rotor is incorporated and a coil is wound around the outer periphery of the coil frame which is divided into right and left via a rotation shaft of the magnet rotor. By providing a bearing recess for supporting one end of the rotating shaft of the magnet rotor in one of the coil frames, and providing a bearing recess for supporting the other end of the rotating shaft in the other of the half-cut coil frame, the conventional left and right coil frames are provided. As compared with the case where the bearing is formed by the notch formed in each of the above, fine processing is not required for the bearing portion, and the coil frame can be easily formed.
At the same time, no unnecessary frictional load is applied to the rotating shaft of the magnet rotor at the bearing due to the displacement between the two conventional coil frames.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an electromagnetic drive device according to the present invention.
FIG. 2 is an exploded perspective view of the electromagnetic driving device of FIG. 1;
FIG. 3 is an end view of a coil frame of the electromagnetic drive device of FIG. 1;
FIG. 4 is a longitudinal sectional view of the electromagnetic drive device according to the present invention.
FIG. 5 is a partially exploded perspective view showing a light amount adjusting device (aperture device) according to the present invention.
FIG. 6 is a partially exploded perspective view showing a light amount adjusting device (shirt device) according to the present invention.
[Explanation of symbols]
M, M2 Electromagnetic drive device 1 Coil frame 1a, 1b Half-cut coil frame 3 Magnet opening 4 Coil 5 Yoke 6 Transmission arm 7 Rotating shaft 8a, 9a Coupling surface 10, 11 Bearing recess 15 Opening 31, 32 Shut-down device Substrates 20, 21 Substrates 34, 35 of diaphragm device Shuttle blade (blade member)
22, 23 diaphragm blades (blade members)

Claims (6)

A hollow cylindrical coil frame,
A cylindrical magnet rotor rotatably incorporated in the coil frame and having a rotation axis at the center,
A transmission member attached to the rotating shaft and outputting the rotation of the magnet rotor to the outside of the coil frame;
A coil wound around the outer periphery of the coil frame, wherein the cylindrical coil frame is formed by combining two half-cut coil frames divided into left and right in the vertical direction via a rotation shaft of the magnet rotor, An electromagnetic drive, wherein a bearing recess for supporting one end of the rotary shaft is formed on one side of the half-cut coil frame, and a bearing recess for supporting the other end of the rotary shaft is formed on the other side of the half-cut coil frame. apparatus. 2. The electromagnetic drive device according to claim 1, wherein the bearing recess of the half-cut coil frame is formed so as to bulge toward the other half-cut coil frame to be joined. 2. The electromagnetic drive device according to claim 1, wherein both ends of the rotating shaft are formed in a sharp shape, and the bearing recess is formed of a pivot bearing. The electromagnetic drive device according to claim 1, wherein the coil is wound in a direction intersecting a coupling surface between upper and lower end surfaces of the two coil frames. A substantially hollow cylindrical coil frame;
A cylindrical magnet rotor having a rotation axis at the center,
A pair of bearing recessed grooves provided in the coil frame so as to face each other and rotatably supporting the rotating shaft,
A transmission member attached to the rotation shaft and transmitting the rotation of the magnet rotor to the outside of the coil frame;
An electromagnetic drive device comprising: a coil wound around the outer periphery of the coil frame;
The cylindrical coil frame is formed by combining two half-cut coil frames obtained by dividing the cylindrical coil frame into left and right directions in the vertical direction via the rotation shaft of the magnet rotor,
An opening for projecting the transmission member to the outside of the coil frame is formed in a coupling surface of the two half-shaped coil frames,
A pivot bearing portion for bearing one end of the rotary shaft is formed on one of the half-shaped coil frames, and a pivot bearing portion for bearing the other end of the rotary shaft is formed on the other of the half-shaped coil frame. Electromagnetic drive. A substrate having an optical axis opening;
A blade member attached to the substrate for adjusting the light amount of the optical axis opening;
A hollow cylindrical coil frame attached to the substrate,
A cylindrical magnet rotor rotatably incorporated in the coil frame and having a rotation axis at the center,
A transmission member attached to the rotation shaft and transmitting the rotation of the magnet rotor to the blade member;
In a light quantity adjusting device including a coil wound around the outer periphery of the coil frame,
The cylindrical coil frame is formed by combining two half-cut coil frames which are divided into left and right in the vertical direction via the rotation shaft of the magnet rotor,
The light amount adjustment is characterized in that a bearing recess for supporting one end of the rotary shaft is formed on one side of the half-shaped coil frame, and a bearing recess for supporting the other end of the rotary shaft is formed on the other side of the half-shaped coil frame. apparatus.

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