JP2000352739A - Shutter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height dimension of an electromagnetic actuator while securing the ability of the electromagnetic actuator. SOLUTION: The blade group of a focal-plane shutter 11 is driven by the electromagnetic actuators 4A and 4B. The actuators 4A and 4B have a movable member 6 consisting of a movable frame 8 and a permanent magnet 13, and an actuation piece 10 coupled with the 1st blade group is provided at either end of the frame 8, and a rotary supporting shaft piece 12 pivotally supported to be rocked on the shaft part 7 on a base plate 2 is provided at the other end of the frame 8. The magnet 13 is sandwiched by a lower yoke 16 and an upper yoke 17 in the up-and-down direction, and a pair of 1st upper and lower coils 18a and 18b and a pair of 2nd upper and lower coils 19a and 19b wound nearly in parallel with the plate 2 are juxtaposed to hold the magnet 13 in between on the lower yoke 16 and the upper yoke 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shutter provided with a light-shielding blade member for opening and blocking a photographing opening provided on a substrate.

[0002]

2. Description of the Related Art As a conventional camera shutter, for example, the one disclosed in Japanese Patent Application Laid-Open No. 57-100416 is known. The electromagnetically driven shutter device described in the publication includes a shutter base plate having an exposure window, and the shutter base plate is provided with an electromagnetic actuator. The electromagnetic actuator has a cylindrical permanent magnet fixed to a shutter base plate or a frame in a camera, and an iron core is fitted inside the permanent magnet. A blade drive shaft is rotatably supported by the frame, and the blade is connected to the blade drive shaft via a connecting portion and a blade drive arm. Further, a blade drive coil is fixed to the blade drive shaft. When the blade drive coil is energized, the blade drive shaft rotates, and the blade is driven accordingly.

[0003]

However, in the above prior art, the blade driving coil is wound around the cylindrical permanent magnet, and the frame is arranged outside the blade driving coil. As a result, the height dimension of the electromagnetic actuator becomes large. Here, reducing the size of the permanent magnet makes it possible to reduce the height of the electromagnetic actuator. However, the force for rotating the blade drive shaft, that is, the force of the electromagnetic actuator is reduced, which is not preferable.

An object of the present invention is to provide a camera shutter capable of reducing the height of the electromagnetic actuator while securing the power of the electromagnetic actuator.

[0005]

In order to achieve the above object, the present invention provides a substrate provided with a photographing opening, a light shielding blade member for opening and blocking the photographing opening, and driving the light shielding blade member. An electromagnetic actuator, the electromagnetic actuator having a permanent magnet, a movable member having one end connected to the light-shielding blade member and the other end pivotally supported, and attached to the substrate; It has a yoke member having an upper yoke and a lower yoke arranged so as to sandwich the magnet in the vertical direction, and a coil provided on the yoke member so as to face the permanent magnet and wound substantially parallel to the substrate. A camera shutter is provided.

In the present invention configured as described above,
When the coil is energized, an electromagnetic force is generated in the magnetic field formed by the permanent magnet, and the electromagnetic force causes the movable member to swing, thereby driving the light shielding blade member. The force to swing the movable member at this time (the amount of force of the electromagnetic actuator)
Is determined by the size (volume) of the permanent magnet. As the size of the permanent magnet increases, the force for moving the movable member increases. Here, even if the thickness of the permanent magnet is reduced, the volume of the permanent magnet does not need to be reduced by increasing the lateral dimension of the permanent magnet. So by doing so,
The height dimension of the electromagnetic actuator can be reduced without reducing the force of the electromagnetic actuator.

Further, since the movable member is provided with a permanent magnet and the yoke member is provided with a coil, when the coil is energized, the movable member swings without moving the coil. Disconnection of the connected lead wire is prevented.

Preferably, in the camera shutter, the movable member has a movable frame having one end connected to the light-shielding blade member and the other end pivotally supported so as to be swingable. The permanent magnet is fixed.
Thus, the movable member can be easily and inexpensively manufactured.

In this case, preferably, the permanent magnet is formed with a groove for positioning the movable frame in the permanent magnet, and the permanent magnet is inserted into the groove with the movable frame partially inserted into the groove. Fixed. Thereby, at the time of manufacturing the movable member, the movable frame can be easily positioned with respect to the permanent magnet, and both can be firmly connected.

For example, the other end of the movable member is pivotally supported by the substrate so as to be swingable. In this case, for example, a shaft is erected on the substrate, and the other end of the movable member is pivotally supported on the shaft.

[0011] In this case, preferably, the substrate is provided with a shaft portion which supports the movable member so as to be swingable and which holds the yoke member. Thereby, the number of members for fixing the yoke member to the substrate can be reduced, and the structure of the substrate is simplified.

The other end of the movable member may be pivotally supported by a yoke member. In this case, for example,
A shaft is erected on the lower yoke, and the other end of the movable member is pivotally supported on the shaft.

Preferably, the permanent magnet is vertically magnetized, and the coil comprises a pair of upper and lower first coils respectively provided on an upper yoke and a lower yoke so as to sandwich the permanent magnet. A pair of upper and lower second coils are provided on the upper yoke and the lower yoke so as to sandwich the permanent magnet adjacent to the coil in the swinging direction of the movable member.

In such a configuration, a pair of upper and lower first
When each coil is energized to form an electromagnet having a polarity opposite to each other in the coil, and to form an electromagnet having a polarity opposite to the first coil in the pair of upper and lower second coils, An attractive force is generated between one of the first coil and the second coil and the permanent magnet, and at the same time, a repulsive force is generated between the other of the first coil and the second coil and the permanent magnet. Thereby, the movable member can be smoothly moved in both directions. Further, since the coils are provided on the upper yoke and the lower yoke, the power efficiency of the electromagnetic actuator is improved.

Preferably, the photographing opening has a substantially rectangular shape, the light-shielding blade member comprises a set of two blades for opening and closing the photographing opening, and the electromagnetic actuator comprises:
Each electromagnetic actuator is composed of a set of two for individually driving each blade group, and each of the electromagnetic actuators is arranged side by side on one of four sides forming a photographing opening on the substrate, so that a focal plane shutter is provided. Make up. This allows
The width of the substrate can be reduced.

The photographing opening has a circular shape, and the light-shielding blade member comprises a set of two blades for opening and blocking the photographing opening, and the electromagnetic actuator individually drives each blade group. A pair of two electromagnetic actuators may be arranged on the substrate at substantially point-symmetric positions with respect to the center of the photographing aperture to constitute a lens shutter. As a result, the pair of blade groups are positioned symmetrically with respect to the center of the imaging aperture, so that each blade group can be moved in a well-balanced manner.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a camera shutter according to the present invention will be described below with reference to the drawings.

First, a first embodiment of a camera shutter according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a focal plane shutter which is a camera shutter of the present embodiment. In FIG. 1, a focal plane shutter 1 includes a substrate 2 on which a substantially rectangular imaging opening 2a is formed. The photographing opening 2a is sequentially opened and shielded by a first blade group 3A and a second blade group 3B, which are light-shielding blade members disposed on the back side of the substrate 2. The first blade group 3A and the second blade group 3
B is driven by electromagnetic actuators 4A and 4B via drive arms 5A and 5B, respectively. The electromagnetic actuators 4A and 4B are arranged side by side on one of the four sides forming the photographing opening 2a on the substrate 2 so that the width dimension of the substrate 2 (in the horizontal direction in FIG. 1). Size) can be reduced.

Such an electromagnetic actuator 4A, 4B
2 to 4 are shown in FIGS. Since the structures of the electromagnetic actuators 4A and 4B are exactly the same, only the structure of the electromagnetic actuator 4A will be described below.

The electromagnetic actuator 4A has a movable member 6, and the movable member 6 has a movable frame 8 which can swing around a shaft 7 provided on one end of the substrate 2. . The movable frame 8 has a connecting portion 9 having a rectangular cross section extending in one direction, and an operating piece 10 is attached to one end of the connecting portion 9.
Is provided. A driving pin 1 is provided at the tip of the operating piece 10.
The drive pins 11 are connected to the first blade group 3A through through holes (not shown) formed in the substrate 2. The other end of the connecting portion 9 is provided with a rotating shaft piece 12. A through-hole 12a is formed in the rotating shaft piece 12, and the shaft 7 is inserted into the through-hole 12a, whereby the movable frame 8 is pivotally supported by the shaft 7. When the shutter 1 (see FIG. 1) is installed in a camera (not shown), the upper end of the shaft 7 comes into contact with other members in the camera so that the movable frame 8 does not come off the shaft 7. Has become.

A plate-like permanent magnet 13 for generating a magnetic field is fixed to the movable frame 8. On the back surface 13a of the permanent magnet 13, a groove 14 having a rectangular cross section for positioning the movable frame is formed.
The movable frame 8 is fixed to the movable frame 8 by bonding or the like with the coupling portion 9 of the movable frame 8 inserted into the groove portion 14. When the movable frame 8 and the permanent magnet 13 are coupled, the non-coupling surface 9a of the coupling portion 9 is
It is almost flush with a. Since the movable member 6 is composed of the movable frame 8 and the permanent magnet 13 as described above, the movable member 6 can be easily and inexpensively manufactured. Further, since the connecting portion 9 of the movable frame 8 is inserted into the groove portion 14 of the permanent magnet 13 and connected thereto, the movable frame 8 can be easily positioned with respect to the permanent magnet 13 when the movable member 6 is manufactured. Can be firmly bonded.

Further, the permanent magnet 13 is formed thin enough to secure a size (volume) that can obtain a magnetic force enough to move the movable member 6 smoothly. As described above, a force for smoothly driving the movable member 6 can be obtained while making the permanent magnet 13 thin, so that the electromagnetic actuator 4A
It is possible to reduce the height of the electromagnetic actuator 4A while securing the desired force. The permanent magnet 13 is magnetized so as to have a polarity in the vertical direction.

The permanent magnet 13 of the movable member 6 as described above
Are covered by the yoke member 15. Yoke member 15
Is attached to the substrate 2 and has a lower yoke 16 having a U-shaped cross section with a bottom plate portion 16a formed in a substantially arc shape, and is connected to the upper end of the lower yoke 16 and formed in a substantially arc shape like the bottom plate portion 16a. The upper yoke 17 includes a bottom plate 16 a of the lower yoke 16 and the upper yoke 17.
3 are vertically sandwiched. Here, the bottom plate portion 16a of the lower yoke 16 and the upper yoke 17 are formed to have a substantially arc shape because the permanent magnet 13 is always moved when the movable member 6 swings.
Is to be covered by the yoke member 15.

A pair of upper and lower first coils 18a, 18b wound substantially parallel to the substrate 2 and facing each other are provided on the upper surface of the bottom plate portion 16a of the lower yoke 16 and the lower surface of the upper yoke 17.
A pair of upper and lower second coils 19a and 19b are arranged side by side in the swinging direction of the movable member 6 so as to sandwich the permanent magnet 13. A current supply source (not shown) is connected to these coils 18a to 19b via lead wires (not shown). Then, the coils 18a to 19b are energized by the current supply source via the lead wires.

In such a configuration, for example, the permanent magnet 13 is magnetized so that the upper side has an N pole and the lower side has an S pole. Each of the coils 18a to 18a
A current in a predetermined direction is applied to the first coil 19b to generate an S pole above the first coil 18a and below the second coil 19b.
An N pole is generated below the coil 18b and above the second coil 19a. In this case, a repulsive force is generated between the permanent magnet 13 and the first coils 18a, 18b, and an attractive force is generated between the permanent magnet 13 and the second coils 19a, 19b. As a result, each movable member 6 swings clockwise about the shaft portion 7. On the other hand, when a current in the opposite direction is applied to each of the coils 18a to 19b by the current supply source to generate the opposite polarity to each of the coils 18a to 19b, the distance between the permanent magnet 13 and the first coils 18a and 18b is increased. At the same time, a repulsive force is generated between the permanent magnet 13 and the second coils 19a and 19b. As a result, each movable member 6 swings counterclockwise about the shaft 7. Move. The movable member 6 smoothly moves in both directions due to the attraction and repulsion generated between the permanent magnet 13 and each of the coils 18a to 19b. Also,
At this time, since the coils 18a to 19b are provided on the upper surface of the bottom plate 16a of the lower yoke 16 and the lower surface of the upper yoke 17, respectively, the power efficiency is good.

In the focal plane shutter 1 configured as described above, in the state shown in FIG. 1 in which the first blade group 3A is at the position where the opening window is shielded and the second blade group 3B is at the open position, When the energization of the coils 18a to 19b of the coils 4A and 4B is started, the movable members 6 start swinging clockwise around the shaft 7 by the magnetic force. As a result, the first blade group 3A connected to the movable member 6 of the electromagnetic actuator 4A via the drive arm 5A acts as a leading blade and opens the photographing opening 2a from top to bottom as viewed in FIG. While traveling, the second blade group 3B connected to the movable member 6 of the electromagnetic actuator 4B via the drive arm 5B acts as a rear blade and travels so as to cover the photographing opening 2a. The exposure ends (see FIG. 5).

Next, the coils 18a to 19b of the electromagnetic actuator 4B are energized in the direction opposite to the previous direction. Then, the movable member 6 is moved to the shaft portion 7 by the magnetic force acting in the opposite direction.
Swings counterclockwise around the second blade group 3B,
As the leading blade, the vehicle travels upward while opening the photographing opening 2a from below as viewed in FIG. Subsequently, the coils 18a to 19b of the electromagnetic actuator 4A are provided with a predetermined time difference.
Is reversely energized. Then, similarly to the above, the movable member 6
Swings counterclockwise, and the first blade group 3A travels as the rear blade so as to cover the photographing opening 2a. The second exposure is completed by the end of the traveling, and the state returns to the state shown in FIG.

Here, the permanent magnet 13 has a volume sufficient to move the movable member 6 smoothly, and when the coils 18a to 19b are energized, the permanent magnet 13
The movable member 6 swings stably in both directions since an attractive force and a repulsive force are generated between the movable member 6 and the coils 18a to 19b.

The first blade group 3A and the second blade group 3B
However, since both of them can alternately play the role of the leading blade and the trailing blade, the conventional charging operation becomes unnecessary, and the photographing interval during continuous photographing can be shortened. Further, since the traveling patterns of the first blade group 3A and the second blade group 3B can be respectively controlled only by the electromagnetic actuators 4A and 4B, the control program of the electromagnetic actuators 4A and 4B is changed when double shading is required. Only with this, it is possible to obtain a double-light-shielded shutter without mechanical remodeling / change.

In the present embodiment, the number of coils is four in total, and two coils are arranged in parallel on the upper surface of the bottom plate 16a of the lower yoke 16 and on the lower surface of the upper yoke 17, respectively. The number of coils may be two in total, and the coils may be juxtaposed only on one of the upper surface of the bottom plate 16 a of the lower yoke 16 and the lower surface of the upper yoke 17.
FIG. 6 shows two coils 18a and 19a as an example.
Shows the electromagnetic actuator 25 arranged in parallel on the upper surface of the bottom plate 16a of the lower yoke 16.

Further, the shaft 7 is erected on the substrate 2 and
A through hole 12a is formed in the rotating shaft piece 12 of the movable member 6,
Although the movable member 6 is pivotally supported by the shaft portion 7, a drive pin is provided on a rotation support shaft piece of the movable member 6, and a through-hole in which the drive pin is inserted is formed in the substrate 2. Such a configuration may be adopted.

Next, a second embodiment of the camera shutter according to the present invention will be described with reference to FIG. In the figure, the first
The same reference numerals are given to the same or equivalent members as those of the embodiment, and the description is omitted.

The camera shutter of the present embodiment has an electromagnetic actuator 31 shown in FIG. 7, and this electromagnetic actuator 31 has a movable member 32. The movable member 32 includes a movable frame 33 and a permanent magnet 13 fixed to the movable frame 33, similar to the first embodiment. The movable frame 33 is larger than the rotary shaft piece 12 in the first embodiment. It has a rotating shaft piece 34 with a small height dimension. Other configurations of the movable frame 33 are the same as those of the movable frame 8 in the first embodiment described above.

The permanent magnet 13 of the movable member 32 is covered by a yoke member 35. This yoke member 3
Reference numeral 5 includes a lower yoke 36 having a U-shaped cross section in which the bottom plate portion 36a is formed in a substantially arc shape, and a plate-shaped upper yoke 37 formed in a substantially arc shape in accordance with the bottom plate portion 36a. On the upper surface of the bottom plate portion 36a of the lower yoke 36, the same coils 18a, 19a as those in the first embodiment are arranged in parallel, and on the lower surface of the upper yoke 37, the same coils 18b, 19b as those in the first embodiment are arranged. I have.

A holding portion 38 protrudes from one side of the bottom plate portion 36a of the lower yoke 36. The holding portion 38 has a through hole 34a formed in the rotary shaft piece 34 of the movable frame 33.
A through hole 38a having a larger diameter than that is formed. A holding portion 39 protrudes from a portion of the upper yoke 37 corresponding to the holding portion 38, and a through hole 39 a having a smaller diameter than the through hole 34 a of the rotating shaft piece 34 is formed in the holding portion 39. .

Such a yoke member 35 is attached to the substrate 2 while being held by a shaft 40 erected on the substrate 2. The shaft portion 40 is formed in a stepped shape, and is provided with a lower step portion 40a, a middle step portion 40b, and an upper step portion 40c whose diameter decreases in order from the bottom. The bottom portion 36a of the lower yoke 36 is fixed to the substrate 2 with the lower portion 40a inserted into the through hole 38a of the holding portion 38 of the lower yoke 36, and in this state, the middle portion 40b is In the through hole 34a. Then, in a state where the upper portion 40c is inserted into the through hole 39a of the holding portion 39 of the upper yoke 37,
An upper yoke 37 is connected to an upper end of the lower yoke 36.

As described above, the movable member 3 is
2 and the function of holding the yoke member 35 are also used.
The number of members for holding the substrate 2 can be reduced, and the structure of the substrate 2 can be simplified.

Next, a third embodiment of the camera shutter according to the present invention will be described with reference to FIGS. In the drawing, the same or equivalent members as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. The camera shutter according to the present embodiment includes an electromagnetic actuator 51 shown in FIGS. 8 and 9, and the electromagnetic actuator 51 includes a movable member 52.
have. The movable member 52 includes a movable frame 53,
A permanent magnet 13 similar to that of the first embodiment is fixed to the movable frame 53. Movable frame 53
Has a connecting portion 9 and an operating piece 10 similar to those of the first embodiment described above, and a rotary shaft having a through hole 54a formed at an end of the connecting portion 9 opposite to the operating piece 10. A piece 54 is provided. Such a movable member 52 is rotatably supported by a yoke member 55. The yoke member 55
A lower yoke 57 having a U-shaped cross section having a bottom plate portion 56 attached to the substrate 2 and a plate-like upper yoke 58 connected to the upper end of the lower yoke 57 include a bottom plate portion 56 and an upper yoke 58. Thereby, the permanent magnet 13 of the movable member 52 is vertically sandwiched.

The bottom plate portion 56 is provided in the coil disposition region 5 where the same coils 18a and 19a as those in the first embodiment are provided on the upper surface.
6a and a support region 5 in which an upwardly extending shaft portion 59 is erected.
6b. The shaft portion 59 penetrates through the through hole 54 a of the rotation shaft piece 54, whereby the movable member 52 is pivotally supported by the shaft portion 59 so as to be swingable. The shaft 59
Has a protrusion 59a at the upper end. Upper yoke 58
The coil arrangement area 58a in which the same coils 18b and 19b are provided on the lower surface as in the first embodiment, and the support area 58b in which the through hole 60 forming the bearing of the shaft 59 is provided
It consists of The protrusion 59 of the shaft portion 59 is provided in the through hole 60.
a is inserted, and the upper yoke 58 is received on the edge surface of the shaft portion 59. Thereby, the positions of the upper yoke 58 and the lower yoke 57 can be effectively regulated in the thrust direction.

Next, a fourth embodiment of the camera shutter according to the present invention will be described with reference to FIGS. In the drawing, the same or equivalent members as those of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 10, the camera shutter 71 of the present embodiment is a lens shutter, and the lens shutter 71 has a substantially circular substrate 72.
Is formed with a circular photographing opening 72a at the center. The photographing opening 72a is opened and shielded by a first blade group 73A and a second blade group 73B composed of two blades arranged on the back side of the substrate 72. First blade group 73A
The second blade group 73B is driven by the same electromagnetic actuators 4A and 4B as in the first embodiment.

The electromagnetic actuators 4A and 4B are
2 is disposed at a position substantially symmetrical with respect to the center of the photographing opening 72a, whereby the first blade group 73A
And the second blade group 73B are driven symmetrically with respect to the center of the photographing opening 72a.

In such a lens shutter 71,
In a state shown in FIG. 10 in which the first blade group 73A and the second blade group 73B are both open, the electromagnetic actuators 4A and 4B
When the coil of each movable member 6 is energized, each movable member 6 swings clockwise around the shaft 74 erected on the substrate 72 by magnetic force, and the first blade group 73A and the second blade The group 74B is closed together, and the photographing opening 72a is shielded (see FIG. 11). At this time, the first blade group 73A and the second blade group 73B swing symmetrically with respect to the center of the imaging opening 72a, so that the balance efficiency is good.

Although several embodiments of the camera shutter according to the present invention have been described above, it goes without saying that the present invention is not limited to the above embodiments. For example, although the movable frame and the permanent magnet of the movable member are configured as separate members, they may be integrally formed of plastic. In the fourth embodiment, the electromagnetic actuator according to the first embodiment is applied to a lens shutter. However, the electromagnetic actuator according to the second and third embodiments may be applied to a lens shutter.
In addition, it goes without saying that the present invention can be variously modified without departing from the spirit thereof.

[0045]

According to the present invention, the permanent magnet can be made thin without reducing the volume of the permanent magnet, so that the height of the electromagnetic actuator can be reduced while securing the power of the electromagnetic actuator. . Further, when the light-shielding blade member is constituted by a set of two blades and each blade group is individually driven by a different electromagnetic actuator, the charging operation is not required and the photographing interval during continuous photographing is shortened. Is done. Further, a double-shielded shutter can be obtained only by changing the control program without mechanically modifying or changing each electromagnetic actuator.

[Brief description of the drawings]

FIG. 1 is a plan view showing a focal plane shutter which is a first embodiment of a camera shutter according to the present invention.

FIG. 2 is an exploded perspective view of the electromagnetic actuator shown in FIG.

FIG. 3 is a plan view of the electromagnetic actuator shown in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an operation explanatory view of the electromagnetic actuator shown in FIG. 1;

FIG. 6 is an exploded perspective view showing a modification of the electromagnetic actuator shown in FIG.

FIG. 7 is an exploded perspective view of an electromagnetic actuator in a camera shutter according to a second embodiment of the present invention.

FIG. 8 is a plan view of an electromagnetic actuator in a camera shutter according to a third embodiment of the present invention.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

FIG. 10 is a plan view showing a lens shutter which is a fourth embodiment of the camera shutter according to the present invention.

FIG. 11 is an operation explanatory view of the electromagnetic actuator shown in FIG. 10;

[Explanation of symbols]

1: Focal plane shutter (shutter for camera),
Reference numeral 2 denotes a substrate, 2a denotes a photographing aperture, 3A denotes a first blade group (light-shielding blade member), 3B denotes a second blade group (light-shielding blade member), 4A and 4B denotes an electromagnetic actuator, 5A and 5B denotes a drive arm, and 6 denotes a movable member. Reference numeral 7: Shaft portion 8: Movable frame, 9: Coupling portion 10: Actuating piece, 11: Drive pin 12: Rotating support shaft piece, 13: Permanent magnet 14: Groove for positioning the movable frame, 15: Yoke member 16: Bottom Yoke, 17 Upper yoke 18a, 18b First coil, 19a, 19b
... Second coil 25 ... Electromagnetic actuator 31 ... Electromagnetic actuator 32 ... Movable member 33 ... Movable frame 34 ... Rotating shaft piece 35 ... Yoke member 36 ... Lower yoke 37 ... Upper yoke 38 ... Holder 39 ... Holder Reference numeral 40: Shaft 51: Electromagnetic actuator 52: Movable member 53: Movable frame 54: Rotating support piece 55: Yoke member 57: Lower yoke 58: Upper yoke 59: Shaft 71: Lens shutter (for camera) Shutter 72) substrate, 72a photographing aperture 73A first blade group (light shielding blade member) 73B second blade group (light shielding blade member) 74 shaft part

Claims (9)

[Claims] 1. A substrate provided with a photographing opening, a light-shielding blade member for opening and blocking the photographing opening, and an electromagnetic actuator for driving the light-shielding blade member, wherein the electromagnetic actuator includes a permanent magnet. A movable member, one end of which is connected to the light-shielding blade member and the other end of which is pivotally supported, and attached to the substrate, and arranged so as to vertically sandwich the permanent magnet. A yoke member having an upper yoke and a lower yoke, and a coil provided on the yoke member so as to face the permanent magnet and wound substantially parallel to the substrate. Shutter. 2. The movable member includes a movable frame having one end connected to the light-shielding blade member and the other end pivotally supported on the movable frame. 2. The camera shutter according to claim 1, wherein the shutter is fixed. 3. A groove for positioning a movable frame is formed in the permanent magnet, and the permanent magnet is fixed to the movable frame with a part of the movable frame inserted into the groove. The camera shutter according to claim 2, wherein: 4. The apparatus according to claim 1, wherein the other end of the movable member is pivotally supported by the substrate.
The camera shutter according to any one of claims 1 to 3. 5. A camera shutter according to claim 4, wherein said substrate has an upright shaft portion for pivotally supporting said movable member and holding said yoke member. 6. The camera shutter according to claim 1, wherein the other end of the movable member is pivotally supported by the yoke member. 7. The permanent magnet is vertically magnetized, and the coil includes a pair of upper and lower first coils respectively provided on the upper yoke and the lower yoke so as to sandwich the permanent magnet. A pair of upper and lower second coils respectively provided on the upper yoke and the lower yoke so as to sandwich the permanent magnet adjacent to the first coil in the swinging direction of the movable member. A camera shutter according to any one of claims 1 to 6. 8. The photographing opening has a substantially rectangular shape.
The light shielding blade member opens and shields the photographing opening 2
The electromagnetic actuator is composed of a set of individual blades,
Each of the electromagnetic actuators comprises a set of two for individually driving each of the blade groups, and each of the electromagnetic actuators is arranged side by side on one of four sides forming the imaging opening on the substrate, The camera shutter according to any one of claims 1 to 7, further comprising a focal plane shutter. 9. The imaging aperture has a circular shape, the light-shielding blade member includes a set of two blades for opening and shielding the imaging aperture, and the electromagnetic actuator includes: , Each of which is individually driven, and each of the electromagnetic actuators is disposed on the substrate at a position substantially point-symmetric with respect to the center of the photographing aperture, thereby forming a lens shutter. The camera shutter according to any one of claims 1 to 7, wherein: