JP5677060B2 - Camera blade drive device - Google Patents

Description

  The present invention relates to a technique for reciprocating blade members such as shutter blades and ND filters in a blade chamber.

  In a blade drive device for a camera, a shutter drive device, a diaphragm drive device, an ND filter drive device, and the like are not unitized alone, but two or more drive devices are often configured as a unit. In this case, the blades of each device may be disposed in one blade chamber, or the respective blade chambers may be disposed.

  In many cases, the blades of each device are reciprocated by the respective electromagnetic actuators. For this reason, when two or more blade driving devices are configured as one unit, two or more electromagnetic actuators are provided.

  Thus, the present invention is a camera blade driving device that includes a plurality of electromagnetic actuators, and in which the different blades individually reciprocate.

By the way, in recent years, digital cameras have been increasingly required to be smaller and thinner.
For this reason, in the case of a camera blade drive device including a plurality of electromagnetic actuators as described above, a technique that can reduce the thickness of the electromagnetic actuator is disclosed (Patent Document 1).

JP 2008-8947 A

  However, the method described in Patent Document 1 has a problem that the permanent magnet of the rotor is attracted to the yoke before the frame member is incorporated into the main plate, and the rotor is detached from the main plate, resulting in poor incorporation. In addition, there is a problem that if the rotor is assembled to the frame member in advance and then the rotor is assembled to the main plate, the drive pins of the rotor cannot be successfully assembled into the hole of the main plate.

In order to solve the above problem, the present invention relates to a frame member in which a first bobbin portion that winds a first coil and a second bobbin portion that winds a second coil are integrally formed. The first and second rotors each having a permanent magnet and rotatable with respect to the frame member, each having two legs, and the first and second rotations at the legs. scissors includes a child and clearance, the first, the by energizing the second coil first, first rotating the second rotor, and a second yoke, a a member the frame member is attached A ground plate having an opening for exposure and first and second openings through which the first and second drive pins of the first and second rotors pass, and the first plate penetrating the ground plate. 1, is connected to the second drive pin, and the first, is rotated by the rotation of the second rotor, and before The drive device for a camera vane comprising a plurality of vanes which advance and retreat in opening for exposure of the base plate, and
The frame member is formed with rotation restricting means for restricting rotation of the first and second rotors,
When the first and second rotors are incorporated in the frame member, the rotation restricting means restricts the rotation of the first and second rotors, and the first and second rotors are When incorporated into the main plate, the first and second rotors are separated from the rotation restricting means .

  As described above, according to the present invention, it is possible to achieve an improvement in assemblability in addition to a reduction in thickness and an assembly process.

It is a development perspective view by the side of an actuator of the blade drive device for cameras concerning the embodiment of the present invention. It is a figure explaining the back side of the main plate. It is a figure which shows a mode that the yoke 104a and the yoke 104b were integrated in the frame member 102. FIG. It is a figure which shows a mode that the rotors 103a and 103b are integrated in the frame member 102. FIG. FIG. 3 is a view showing a state in which rotors 103a and 103b are incorporated in a frame member 102. It is a figure which shows that the frame member 102 can be unitized and integrated with respect to the ground plane 101. FIG. It is a figure which shows the state with which the rotors 103a and 103b were integrated in the ground plane 101. FIG. It is a figure which shows the expansion perspective view which looked at a mode that the rotor 103a was integrated in the ground plane 101 from the front. It is a perspective view which shows the mode of the shutter blade | wing and ND blade | wing in an imaging | photography state. It is a perspective view which shows the mode of the shutter blade | wing and ND blade | wing in the state by which electricity supply was cut | disconnected (it does not need a light reduction). It is a perspective view which shows the mode of the shutter blade | wing and ND blade | wing in the state with which electricity supply was cut | disconnected (it needs light reduction).

  DETAILED DESCRIPTION Exemplary embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. However, the dimensions, shapes, relative arrangements, and the like of the components exemplified in the present embodiment should be changed as appropriate according to the configuration of the apparatus to which the present invention is applied and various conditions. It is not limited to. The present embodiment is a camera blade drive device in which a shutter drive mechanism having two shutter blades and an aperture mechanism having one ND blade are configured as one unit.

<Camera blade drive actuator actuator>
First, the configuration of an actuator for driving the blades of this embodiment will be described with reference to FIG.

  A shutter blade and an actuator for driving the ND blade are arranged as shown in FIG. 1 on the front side of the base plate of the blade driving device that is the subject side when incorporated in the camera. The front side of the base plate 101 includes a base plate 101, two rotors 103a and 103b, two yokes 104a and 104b, and a frame member 102 having two bobbin portions around which coils 102a1 and 102b1 are wound.

  The frame member 102 is formed of two substantially B-shaped bobbin portions and a portion connecting the two bobbin portions. The two substantially B-shaped bobbin portions are formed hollow, and coils 102a1 and 102b1 are wound around the outer periphery thereof. Further, the yoke 104a has two leg portions 104a1 and 104a2 and a hole portion 104a3 as shown in the figure. The yoke 104b is similarly configured.

  Then, the two yokes 104 are respectively incorporated in two hollow bobbin portions formed on the frame member 102.

<A state in which the yoke 104 is incorporated in the frame member 102>
FIG. 3 is a view showing a state in which the yoke 104a and the yoke 104b are incorporated in the frame member 102. FIG.
As shown in FIG. 3, the yoke 104a and the yoke 104b are assembled by fitting one leg 104a2 and leg 104b2 into the hollow portion of the bobbin portion. The respective protrusions 104a4 and 104b4 of the yoke 104a and the yoke 104b and the protrusions 102a3 and 102b3 of the frame member 102 play a role of preventing disengagement after assembly. This is because the protrusions 104a4 and 104b4 and the protrusions 102a3 and 102b3 are assembled so as to ride on each other's protrusions while interfering with each other during installation. In this state, the frame member 102 and the yoke 104 are temporarily fixed.

<Incorporation of the two rotors 103 into the frame member 102>
Next, incorporation of the two rotors 103a and 103b into the frame member 102 will be described. FIG. 4 is a view showing how the rotors 103a and 103b are assembled into the frame member 102. FIG. Each of the two rotors 103a and 103b is composed of cylindrical permanent magnets 103a1 and 103b1 magnetized in two radial directions, and synthetic resin arms integrally molded with the permanent magnets 103a1 and 103b1, respectively. It has become. The synthetic resin arm constituting the rotor 103a is composed of two rotating shafts 103a2 and 103a4 coaxial with the permanent magnet and a driving pin 103a3 parallel to the rotating shafts 103a2 and 103a4. The same applies to the rotor 103b. The drive pins 103a3 and 103b3 are pins that are connected to shutter blades 105 and 106 and an ND blade 107, which will be described later, and rotate them to reciprocate. Then, the rotation shafts 103a4 and 103b4 of the two rotors 103a and 103b are assembled so as to fit into the holes 102a4 and 102b4 of the frame member 102, respectively.

<State in which the two rotors 103 are incorporated in the frame member 102>
FIG. 5 shows a state in which the rotors 103a and 103b are incorporated in the frame member 102.

  Each of the yokes 104a has the magnetic pole portions at the tips of the two leg portions 104a1 and 104a2. As a result, the tips of the two leg portions 104a1 and 104a2 are opposed to each other along the peripheral surface of the rotor 103a with the permanent magnet 103a1 of the rotor 103a interposed therebetween. However, the rotor 103a is disposed with a clearance as a gap that does not interfere with the two leg portions 104a1 and 104a2 of the yoke.

  Here, the rotor 103a includes a permanent magnet 103a1, and is magnetized into two poles, an N pole and an S pole. When incorporated in the frame member 102, the permanent magnet 103a1 tends to rotate to a magnetically stable position with the two legs 104a1 and 104a2 of the yoke. This magnetically stable position is the position of the normal B when expressed as a normal to the boundary line between the N pole and the S pole as shown in FIG. Therefore, the convex rotation restricting portion 102a5 is provided at a position corresponding to the outside of the opening 101a1 in the base plate described later. That is, when the rotor 103a rotates to the position of the normal A as shown in FIG. 5, the receiving portion 103a5 made of synthetic resin of the rotor 103a hits the convex rotation restricting portion 102a5 of the frame member 102a. As a result, the rotor 103a is regulated by the frame member 102. This is because the rotor 103a is acting to rotate from the position of the normal line A to the position of the normal line B, which is a magnetically stable position. As a result, while being incorporated in the frame member 102, the position of the rotor 103a is held without shifting from the rotation restricting portion. Similarly, the receiving portion 103b5 of the rotor 103b is also held at a position where it abuts against the convex rotation restricting portion 102b5 of the frame member 102. The rotation restricting portion 102b5 is also provided at a position corresponding to the outside of the opening 101b1 in the base plate described later. The receiving portions 103a5 and 103b5 may not be made of synthetic resin, and may be integrated with the shafts 103a3 and 103b3.

  In this way, the yokes 104a and 104b and the rotors 103a and 103b are incorporated into the frame member 102 to form a single unit, which can be incorporated into the main plate 101 as shown in FIG.

  In the state of FIG. 6, the permanent magnet 103a1 of the rotor 103a is in a magnetically attracting relationship with the yoke 104a. Therefore, the rotor 103a is not detached from the frame member 102 before being incorporated into the main plate 101. The same applies to the rotor 103b.

  The rotation restricting portions 102a5 and 102b5 have different shapes. This is because the rotation angles of shutter blades 105 and 106 described later are different.

<Assembly of unitized actuator into main plate 101>
Next, the incorporation of the frame member 102 into the base plate 101 will be described.

  One hole portion 102f of the frame member 102 and two long hole portions 102a7 and 102b7 are fitted to the three shafts 101c of the main plate 101. Further, the frame member 102 is prevented from floating with respect to the main plate 101. This is because the two anti-floating shapes 102a7, 102b7 and one nail portion 102i of the frame member 102 are fitted to the two nail portions 101da, 101db and one anti-floating shape 101e of the base plate 101. It depends.

  In the yoke 104a, the hole portions 104a3 and 104b3 shown in FIGS. 1, 4, and 5 are fitted to the shaft portion 101c of the main plate 101. Further, the arm portions 104a4 and 104b4 of the yoke shown in FIG. 6 are fixedly held to the base plate 101 by fitting the two surfaces 101ga and 101ha and the surfaces 101gb and 101hb of the base plate 101. The same applies to the yoke 104b.

  The rotating shaft 103a2 of the rotor 103a is penetrated to the back surface of the main plate 101 while being rotatably fitted in the hole 101ia of the main plate. At that time, the drive pin 103 a 3 is also incorporated so as to penetrate through the opening 101 a 1 on the arc formed in the base plate 101 to the back surface of the base plate 101. Similarly, the rotor 103b is incorporated in an opening 101b1 on the arc formed in the ground plate 101, and at this time, the drive pin 103b3 also penetrates to the back surface of the ground plate 101.

<About a state in which the rotors 103a and 103b are incorporated in the main plate 101>
FIG. 7 shows a state in which the rotors 103 a and 103 b are incorporated in the main plate 101. FIG. 8 is an enlarged perspective view of the state in which the rotor 103a is incorporated in the main plate 101 as seen from the front.

  Here, before the rotor 103a is incorporated into the base plate 101, the receiving portion 103a5, which is a synthetic resin member, is restricted by the rotation restricting portion 102a5 of the frame member 102 as described above. However, when the frame member 102 is incorporated into the main plate 101, the receiving portion 103a5 is separated from the rotation restricting portion 102a5 of the frame member 102. This is because the rotor 103a (drive pin 103a3) abuts against the end of the hole 101a1 on the arc of the base plate 101 and is restricted from rotating. Similarly, the rotor 103b (driving pin 103b3) also abuts against the end of the hole 101b1 and is restricted from rotating.

  In other words, the rotors 103 a and 103 b are fixedly maintained at the temporary restricting positions 102 a 5 and 102 b 5 with respect to the frame member 102 before being incorporated into the main plate 101. On the other hand, the position is fixed and maintained at the end portions of the openings 101a1 and 101b1 which are regular rotation restricting positions after being incorporated in the main plate 101. The reason why the rotors 103a and 103b are thus restricted with respect to the main plate 101 is as follows.

  That is, the position accuracy of the shutter blades 105 and 106 and the ND blade 107 when opening and closing is severe, and the position is regulated with respect to the base plate 101 as described above, which leads to an improvement in accuracy.

  Further, this is because the rotors 103 a and 103 b regulate the position with respect to the frame member 102 in advance. This is because the rotors 103a and 103b are incorporated in the frame member 102 in which the yokes 104a and 104b are assembled. Accordingly, the positions of the rotors 103a and 103b do not shift when being incorporated into the main plate 101, and the frame member 102 can be smoothly incorporated into the main plate 101.

  In addition, the front-end | tip part of drive pin 103a5, 103b5 is provided with the taper part so that it can incorporate in the ground plane 101. FIG. The opposing openings 101a1 and 101b1 are also tapered so that the drive pins 103a5 and 103b5 can be easily incorporated.

<About the back side of the base plate 101>
Next, the back side of the main plate 101 will be described with reference to FIG.

  The back side of the base plate 101 that is the imaging side includes two shutter blades 105 and 106, an ND blade 107 with an ND filter 107a attached thereto, and a shutter cover 108.

  A blade chamber in which the shutter blades 105 and 106 and the ND blade 107 operate is formed between the main plate 101 and the shutter cover 108. The base plate 101 includes a circular exposure opening 101a and two holes 101ba and 101bb on the arc. The shutter cover 108 is also provided with a central circular opening 108a and a circular hole 108b having the same shape at positions facing the central circular opening 101a and the circular holes 101ba and 101bb on the base plate. As shown in FIGS. 2 and 7, the shutter cover 108 is formed by fitting a hole 108c and a long hole 108d formed in the shutter cover 108 to two shafts 101ja and 101jb formed on the base plate side. It is fixed.

  By fitting the three floating prevention shapes 108e of the shutter cover 108 and the three claw portions 101k of the base plate, the shutter cover 108 is fixed to the base plate 101 without floating in the optical axis direction. The space remains constant without changing. In the blade chamber, two shutter blades 105 and 106 and one ND blade 107 are arranged with the shutter blades 105 and 106 facing the main plate.

  Each shutter blade is provided with holes 105a and 106a and elongated holes 105b and 106b. Similarly, the ND blade 107 is also formed with a hole 107b and a long hole 107c. The ND blade is formed with two circular openings 107d having the same diameter, and an ND filter 107a is attached to one place as shown in FIG.

  As described above, the rotation shafts 103a2 and 103b2 and the drive pins 103a3 and 103b3 of the two rotors 103a and 103b protrude from the holes 101ia and 101ib of the base plate 101 and the holes 101aa and 101bb on the arc. A rotating shaft 101l is formed on the blade chamber side surface of the base plate 101 as shown in FIG. Then, the hole 105a of the shutter blade 105 is fitted to the rotation shafts 103a2 and 103b2 of the rotors 103a and 103b. Similarly, the hole 106 a of the shutter blade 106 is fitted to the rotating shaft 101 l formed on the base plate 101.

  As a result, the shutter blades 105 and 106, which are a plurality of blades, advance and retract to the exposure opening 101a. The forward and backward movement with respect to the opening 101a for exposure is performed by fitting the elongated holes 105a and 106a of the shutter blades 105 and 106 with the drive pins 103a3 and 103b3 of the rotors 103a and 103b. That is, when the driving pins 103a3 and 103b3 of the rotors 103a and 103b operate, the shutter blades 105 and 106 operate with the rotating shafts 103a2, 103b2 and 101l as fulcrums.

  Here, the hole 107b of the ND blade 107 is fitted to the rotation shafts 103a2 and 103b2 of the other rotors 103a and 103b, and the long hole 107c is fitted to the drive pins 103a3 and 103b3. When the drive pins 103a3 and 103b3 of the rotors 103a and 130b operate, the ND blade 107 operates using the rotation shafts 103a2 and 103b2 of the rotors 103a and 103b as fulcrums.

  At this time, the shutter cover has a rotating shaft formed on the base plate that fits with the shutter blades 105 and 106 and the ND blade 107, the driving shafts 103a2 and 103b2 of the rotor, and the tip of each shaft from the hole of the shutter cover 108 It protrudes outside the feather chamber. This is because similar holes 108b108f to 108h are opened at positions facing the drive pins 103a3 and 103b3.

<Operation of shutter blade and ND blade>
Next, the operation of the shutter blades 105 and 106 and the ND blade 107 in this embodiment will be described with reference to FIGS.

  FIG. 9 shows a photographing standby state, and is a perspective view seen from the front with the shutter cover of the camera blade driving device of the present invention removed. The shutter blades 105 and 106 are completely retracted from the opening 107d formed in the ND blade 107. That is, this is a state in which subject light strikes the image sensor through the opening 101a for exposure.

  At this time, although the coils 102a and 102b are not energized, a rotational force that rotates to a magnetically stable position is working. This is because the rotors 103a and 103b are composed of permanent magnets 103a1 and 103b1, and depend on the positional relationship between the two magnetic pole portions 104a1 and 104a2 and 104b1 and 104b2 of the yokes 104a and 104b. As a result, the two shutter blades 105 and 106 are pressed against the ends of the rotation restricting members 101ba and 101bb, 101n and 101o of the base plate 101 by the drive pins 103a and 103b3, respectively, and are fixed and maintained in this state. It is.

  The ND blade 107 is also pressed against the ends of the rotation restricting members 101ba and 101bb of the base plate 101 and 101p by the drive pins 103a and 103b3 of the rotors 103a and 103b. This is because a rotational force that rotates to a magnetically stable position is exerted by the positional relationship between the permanent magnet 103a of the rotor 103 and the two magnetic pole portions 104a1 and 104a2 and 104b1 and 104b2 of the yoke 104. It is kept fixed in this state.

<When it is determined that there is no need to reduce subject light>
Next, it is determined whether to shoot with subject light reduced by photometric means (not shown). When it is determined that the subject light is not reduced, shooting is started when the release button is pressed. When shooting is started, current is supplied to the shutter driving coils 102a1 and 102b1 by an exposure control means (not shown). When a current is supplied to the shutter driving coils 102a1 and 102b1, a rotating force in the direction opposite to the imaging standby state is applied to the rotors 103a and 103b. By this force, the shutter blades 105 and 106 are rotated by the drive pins 103a3 and 103b3 of the rotors 103a and 103b, and the opening 107d of the ND blade 107 is closed. After the opening 107d is completely closed, the energization of the coils 102a1 and 102b1 is cut off, but is fixed and maintained in the state shown in FIG. As in the imaging standby state, the rotors 103a and 103b have a rotational force that rotates to a magnetically stable position depending on the positional relationship between the two magnetic pole portions 104a1 and 104a2 and 104b1 and 104b2 of the yokes 104a and 104b. Because it is. That is, by this force, the shutter blades 105 and 106 are pressed against the ends of the rotation regulating members 101ba and 101bb of the base plate 101 and 101q by the drive pins 103a3 and 103b3 of the rotors 103a and 103b.

<When it is determined that it is necessary to shoot with reduced subject light>
Next, a case will be described in which it is determined that it is necessary to shoot with the subject light reduced by photometric means (not shown). In that case, first, a current is supplied to the coil 102b for driving the ND blade. When a current is supplied to the coil 102b, a counterclockwise rotational force acts on the rotors 103a and 103b toward the paper surface. By this force, the ND blade 107 is rotated by the drive pins 103a3 and 103b3, and the opening 107d of the ND blade 107 is retracted from the optical axis. Then, the filter portion 107a of the ND blade 107 enters the optical axis. Further, after the filter portion 107a of the ND blade 107 has completely entered the optical axis, the coil 102b is de-energized, but is fixed and maintained in the state shown in FIG. This is because the rotors 103a and 103b have a rotational force that rotates to a magnetically stable position due to the positional relationship between the two magnetic pole portions 104a1 and 104a2 and 104b1 and 104b2 of the yokes 104a and 104b. This is because the ND blade 107 is pressed against the ends of the rotation regulating members 101ba and 101bb of the base plate 101 and 101r by the driving pins 103a3 and 103b3 due to this force. Thereafter, shooting is started. The operation of the shutter blades 105 and 106 at the start of photographing is as described above.

  In the embodiment of the present invention, the rotor is formed of a permanent magnet and a synthetic resin, but the whole may be formed of a permanent magnet. Further, in the present embodiment, the two bobbin portions are shaped like a letter C, but any shape may be used. In this embodiment, the ND filter is used to reduce the subject light, but instead of the ND filter, an opening that is slightly smaller than the opening may be formed.

101 Base plate 102 Frame member 103 Rotor 104 Yoke 105 Shutter blade 106 Shutter blade 107 ND blade

Claims (4)

A first bobbin portion for winding the first coil, a frame member in which the second bobbin portion for winding the second coil is integrally formed, a permanent magnet, and the frame member First and second rotors that can rotate, respectively, each having two legs, and sandwiching the first and second rotors with a gap between the legs, the first and second rotors. wherein the energization of the second coil first, first rotating the second rotor, and a second yoke, a member to which the frame member is attached, the opening and the first exposure, the A ground plate having first and second openings through which the first and second drive pins of the two rotors pass , and connected to the first and second drive pins that penetrate the ground plate , and first, it is rotated by the rotation of the second rotor, and a plurality of vanes which advance and retreat in opening for exposure of said base plate In the driving device for a camera vane comprising,
The frame member is formed with rotation restricting means for restricting rotation of the first and second rotors,
When the first and second rotors are incorporated in the frame member, the rotation restricting means restricts the rotation of the first and second rotors, and the first and second rotors are The drive device according to claim 1, wherein the first and second rotors are separated from the rotation restricting means when incorporated in the main plate . The first, if the second rotor is not combined with the base plate, the camera vanes of the driving device according to claim 1, characterized in that position by the rotation regulating member is regulated. 3. The camera blade driving device according to claim 1 , wherein the first and second rotors have axes on an imaging side and a subject side. 4. Said frame member, said first and second bobbin portion and portions connecting it according to one paragraph to any one of claims 1 to 3, characterized in that it is formed in the shape of upward toward the inner edge 26b thereof Camera blade drive device.

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