JP2007010943A - Vane drive device for camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent erroneous operation of a barrier vane caused by impact force, in a drive device used for the barrier vane etc. <P>SOLUTION: The vane drive device includes: a substrate 10 having an opening 10a; a barrier vane 20 supported on the substrate 10 so as to be freely moved between the position facing the opening 10a and the position retracting from the opening 10a; stoppers 11 disposed on the substrate 10 in order to position the barrier vane 20 in the position facing the opening and the position retracting from the opening; and an electromagnetic drive source 40 that drives the barrier vane 20. The barrier vane 20 is provided with a ferromagnetic body in order that the barrier vane 20 is held in the position facing the opening or the retracting position by electromagnetic attraction produced in the directions of its end faces 23 and 24 without contact. The substrate 10 is provided with a permanent magnet 30. Thus, even in the event that the device is subject to impact force, for example, as a result of falling while mounted in a digital camera or the like, the barrier vane is prevented from being freely moved but held in the predetermined position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera blade driving device that drives and positions a blade member such as a barrier blade, a shutter blade, or a diaphragm blade disposed in an opening of a digital camera or the like.

As a conventional camera blade driving device, a substrate having an opening for exposure, a position that is supported rotatably with respect to the substrate (closed position), and a retracted position that is out of the opening (open position) A pair of shutter blades moving between and a motor having a drive pin and a rotor inserted in a hole formed in the shutter blade and driving the shutter blade, and the pair of shutter blades are located at the retracted position A rotor is held at its angular position by a magnetic attraction force, that is, a detent torque, and a shutter blade is held at a retracted position (see, for example, Patent Document 1).
However, in the holding method using the detent torque of the rotor, the shutter blades may move to the closed position because the detent torque is relatively small when an impact force is applied from the outside by dropping the digital camera or the like. There is.

Further, as a conventional camera blade driving device, there are a substrate having an opening for exposure, a diaphragm position that is supported so as to be linearly reciprocable with respect to the substrate, and a retracted position that is out of the opening. A pair of aperture blades that move between them, a drive pin that is inserted into a hole formed in the aperture blades, a motor that has a rotor and drives the aperture blades, and a ferromagnetic plate that is affixed to each of the main surfaces of the pair of aperture blades A permanent magnet or the like that is attached to a lid that covers the substrate and exerts a magnetic attractive force with a predetermined gap from the ferromagnetic plate of the diaphragm blades, and urges the pair of diaphragm blades in one direction at all times. There is known a method for performing a shift (see, for example, Patent Document 2).
However, with this urging method, the diaphragm blade cannot be held at the position facing the opening or the retracted position, and the ferromagnetic plate affixed to the diaphragm blade and the permanent magnet affixed to the lid are: Since the magnetic attractive force is exerted on each other not in the end face of the diaphragm blade but in the main surface direction, the range in which the magnetic attractive force is applied is relatively wide, and there is a problem that the driving load when driving the diaphragm blade is increased.

JP 2001-75145 A JP 2000-314905 A

  The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a blade member even if an impact force is applied due to dropping or the like while simplifying the structure and downsizing the apparatus. An object of the present invention is to provide a blade driving device for a camera that can be reliably held at a position facing the opening or a retracted position deviating from the opening.

A camera blade drive device according to the present invention includes a substrate having an opening, a blade member supported movably between a position facing the opening with respect to the substrate and a retracted position deviating from the opening, and the blade member A blade drive device for a camera, comprising: a stopper provided on the substrate for positioning at a position facing or retracted; and an electromagnetic drive source for driving the blade member, wherein the blade member is not contacted in the end surface direction The blade member is provided with one of a permanent magnet and a ferromagnetic material, and the substrate is provided with the other of the permanent magnet and the ferromagnetic material so as to be held at a position facing or retracted by a magnetic attraction force generated in It is provided.
According to this configuration, when the blade member is driven by the electromagnetic drive source and is in the position facing the opening or in the retracted position deviating from the opening, the blade member is abutted against the stopper and positioned. The blade member is caused by a magnetic attraction force generated in the end face direction of the blade member in a non-contact manner between one of the provided permanent magnet and the ferromagnetic material and the other of the permanent magnet and the ferromagnetic material provided on the substrate. Is securely held at the position facing the opening or the retracted position. Therefore, even if this device is mounted on a digital camera or the like and receives an impact force due to dropping or the like, the blade member does not move arbitrarily but is held in a predetermined position (for example, a state of standby for shooting) ) Can be secured.

The said structure WHEREIN: The structure provided in the vicinity of a stopper can employ | adopt the other of a permanent magnet and a ferromagnetic material.
According to this configuration, since the magnetic attraction force for holding the blade member acts in the vicinity of the blade member abutting against the stopper, the blade member is reliably positioned with a strong holding force at the position facing the opening or the retracted position. Can be held in.

In the above configuration, a configuration in which a permanent magnet is provided on the substrate and the blade member is formed of a ferromagnetic material can be adopted.
According to this configuration, when the blade member is formed of a thin plate-like metal plate or the like, it is only necessary to provide a permanent magnet on the substrate, so that the structure is simplified, and the manufacturing cost and component management cost can be reduced. The cost of the entire apparatus can be reduced.

In the above configuration, it is possible to adopt a configuration in which one of the permanent magnet and the ferromagnetic material is provided on the substrate, and the blade member is formed of a resin material in which the other of the permanent magnet and the ferromagnetic material is mixed or embedded. .
According to this configuration, the weight of the blade member is reduced, and the other of the permanent magnet and the ferromagnetic material is mixed or embedded in the resin material. Therefore, compared to the case where the other of the permanent magnet and the ferromagnetic material is retrofitted. The manufacturing cost and the part management cost can be reduced, and the cost of the entire apparatus can be reduced.

In the above configuration, the blade member includes a link member that transmits the driving force of the electromagnetic drive source. The link member is provided with one of a permanent magnet and a ferromagnetic material, and the other of the permanent magnet and the ferromagnetic material is provided on the substrate. The provided configuration can be adopted.
According to this configuration, since the blade member is indirectly held by holding the link member with a magnetic attraction force, the degree of freedom in design of the blade member (for example, it can be formed entirely of a resin material, or a permanent magnet or The shape can be freely set without considering the position where the ferromagnetic material is provided, etc.), or the degree of freedom of the arrangement of the electromagnetic drive source is increased, and the configuration can be set in accordance with various requirements.

In the above configuration, a configuration in which the permanent magnet or the ferromagnetic body provided on the substrate is adjustable in the mounting position with respect to the substrate can be adopted.
According to this configuration, since the magnetic attractive force generated between the permanent magnet and the ferromagnetic material can be adjusted to a desired strength, the blade member can be adjusted while adjusting the holding force of the blade member to an appropriate size. It can be operated smoothly.

In the above configuration, the blade member may be a barrier blade that opens and closes the opening, a shutter blade that opens and closes the opening, or a diaphragm blade that narrows the opening to a predetermined aperture.
According to this configuration, when the blade member is a barrier blade or a shutter blade, it is possible to prevent the barrier blade or the shutter blade from freely closing the opening when receiving an impact force or the like in a shooting standby state. When the blade member is a diaphragm blade, it is possible to prevent the diaphragm blade from squeezing the opening without permission when receiving an impact force or the like in a standby state for photographing.

  According to the blade drive device for a camera having the above-described configuration, even when the device is mounted on a digital camera or the like and receives an impact force due to dropping or the like, the blade member faces the opening or is retracted away from the opening. It can be securely held in position. That is, a highly accurate operation that does not cause a malfunction with respect to an impact force or the like received by a drop or the like can be obtained while achieving simplification of the structure, downsizing of the apparatus, and the like.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings.
1 to 4 show an embodiment of a camera blade driving device according to the present invention. FIG. 1 is a plan view showing a state in which the blade member faces the opening, and FIG. 2 shows the blade member. FIG. 3 is a cross-sectional view of the apparatus, and FIG. 4 is a partial view showing the inside of the apparatus viewed from the back side of the lens 1 with the cover removed. .

  As shown in FIGS. 1 to 3, this apparatus includes a substrate 10 having a circular opening 10 a, a position supported so as to be swingable with respect to the substrate 10, a position facing the opening 10 a, and a retracted position away from the opening 10 a. A pair of stoppers 11 provided on the substrate 10 for positioning the barrier blades 20 as blade members supported so as to freely move (swing) between the two and the barrier blades 20 at a position facing the retracted position. Rotation drive for driving the pair of permanent magnets 30 and the barrier blades 20 provided at positions where gaps are formed between end surfaces 23 and 24 of the barrier blades 20 to be described later with the barrier blades 20 in contact with each other. An electromagnetic drive source 40 that generates force, a cover 50 that covers the barrier blades 20, a position sensor 60, and the like are provided.

  As shown in FIGS. 1 to 4, the substrate 10 is formed of a resin material so that the outline is substantially rectangular, and a flat surface on which a circular opening 10 a opened at the center and the barrier blade 20 slide. 10b, two stoppers 11 for positioning the barrier blades 20 in contact with each other, a support shaft 12 for swingably supporting the barrier blades 20, a fan-shaped through hole 13 for passing a drive pin 41a of the rotor 41 described later, and the like. Yes.

As shown in FIGS. 1 to 4, the barrier blade 20 is formed of a metal plate that is a ferromagnetic material, and has a circular hole 21 through which the support shaft 12 passes, a long hole 22 through which the drive pin 41a passes, and an opening 10a. An end face 23 that comes into contact with the stopper 11 at the facing position, an end face 24 that comes into contact with the stopper 11 at a position away from the opening 10a, and the like are provided.
As shown in FIGS. 1 and 2, the barrier blade 20 is supported by the circular shaft 21 through the support shaft 12 so as to be swingable, and a drive pin 41 a is inserted into the elongated hole 22. When the rotor 41 is rotated, the barrier blade 20 is opened and closed.
Thus, since the barrier blade 20 is formed of a metal plate made of a ferromagnetic material, it is possible to generate a magnetic attractive force by simply providing the permanent magnet 30 on the substrate 10, and the structure is simplified. Manufacturing costs and component management costs can be reduced, and the cost of the entire apparatus can be reduced.

The pair of permanent magnets 30 is formed in a substantially cylindrical shape and is implanted in the vicinity of each stopper 11 formed on the substrate 10, and the barrier blade 20 is in contact with the stopper 11 while the barrier blade 20 is in contact with the stopper 11. The end faces 23 and 24 and the permanent magnet 30 are formed so as not to contact each other.
Thus, since the permanent magnet 30 is provided in the vicinity of the stopper 11, the magnetic attraction force that holds the barrier blade 20 acts in the vicinity of the barrier blade 20 coming into contact with the stopper 11. Can be securely held at the position facing the opening 10a or the retracted position with a strong holding force.

  That is, one of the permanent magnets 30 is magnetically attracted in a non-contact manner in the direction of the end face 24 of the barrier blade 20 when the barrier blade 20 moves to the retracted position away from the opening 10a and contacts the stopper 11. The barrier blade 20 is securely held in the retracted position by the force. On the other hand, when the other permanent magnet 30 moves to a position where the barrier blade 20 faces the opening 10a and comes into contact with the stopper 11, the magnetic force generated by non-contact in the direction of the end face 23 of the barrier blade 20 is caused. The barrier blade 20 is securely held at the position facing it.

The electromagnetic drive source 40 is a moving magnet type motor, and includes a rotor 41 having two magnetic poles in the circumferential direction and rotating within a predetermined angle range, a drive pin 41 a integrally formed with the rotor 41, and the rotor 41. , A coil 41 for excitation, a cylindrical yoke 43 that forms a magnetic path, an iron pin 44, and the like, and are fixed to the substrate 10 with screws or the like. .
When the coil 42 is energized in one direction, the rotor 41 rotates clockwise, the barrier blade 20 moves to a position facing the opening 10a, and the coil 42 is energized in the other direction. The rotor 41 rotates counterclockwise, and the barrier blade 20 moves to a retracted position that is out of the opening 10a.

  The cover 50 is attached to the substrate 10 at a predetermined interval to cover the barrier blade 20, and as shown in FIGS. 1 to 3, a circular shape provided at a position corresponding to the opening 10 a of the substrate 10. , An opening 51 through which the screw B passes, a long hole 52 through which the tip of the drive pin 41a passes, and a plurality of positioning holes or escape holes.

  The position sensor 60 is a photo interrupter including a light emitting element and a light receiving element, and detects whether or not the barrier blade 20 is in the retracted position by detecting the presence or absence of the detected piece 41b of the rotor 41. .

Next, an operation when this apparatus is mounted on a digital camera will be described with reference to FIGS.
First, in the stowed state where the digital camera is not photographed, as shown in FIG. 1, the barrier blade 20 is positioned at the position facing the opening 10a, and the opening 10a is closed to protect the internal lens optical system. It is in. The electromagnetic drive source 40 generates a detent torque due to a magnetic attractive force generated between the iron pin 44 and the rotor 41 in a non-energized state. Further, the permanent magnet 30 is attracted by exerting a magnetic attraction force in a non-contact state with respect to the end face 23 region of the barrier blade 20 to hold the barrier blade 20 in this position.

From this state, when the operator turns on the switch for shooting standby state, the electromagnetic drive source 40 is activated and the rotor 41 (drive pin 41a) rotates by a predetermined angle, and the barrier blade 20 is shown in FIG. As shown, it moves to a retracted position that is out of the opening 10a.
Then, the barrier blade 20 abuts against the stopper 11, and the end magnet 24 is attracted and held by the permanent magnet 30 by the magnetic attractive force. Thereby, the barrier blade | wing 20 is reliably hold | maintained in this retracted position. Therefore, even if an impact force or the like is received from the outside in this state, the barrier blade 20 is not moved without permission but is kept at the retracted position, and the photographing standby state is maintained.

  In this embodiment, the permanent magnet 30 is provided on the substrate 10 and the barrier blade 20 is provided with a ferromagnetic material. Conversely, the substrate 10 is provided with a metal ferromagnetic material and the end face 23 of the barrier blade 20 is provided. , 24 may be configured to attach permanent magnets.

FIG. 5 is a view seen in the same manner as FIG. 4 and shows another embodiment of the camera blade driving device according to the present invention. The material of the barrier blade 20 ′ and the shape of the permanent magnet 30 ′ are changed. Except for the above, the configuration is basically the same as that of the above-described embodiment. Therefore, the same components are denoted by the same reference numerals and description thereof is omitted.
In this apparatus, the barrier blade 20 'is molded using a resin material mixed with a ferromagnetic material such as metal powder. In particular, when the barrier blade 20 ′ is at the position facing the opening 10 a or at the retracted position, it is formed so as to include a ferromagnetic material in the region of the end faces 23 and 24 located near the permanent magnet 30 ′.
Further, the permanent magnet 30 'is formed so as to have a substantially rectangular cross section, that is, an area facing the end faces 23, 24 of the barrier blade 20' is increased.

  Thus, since the barrier blade 20 'is formed of a resin material mixed with ferromagnetic powder, the barrier blade 20' can be reduced in weight as compared with the case where all of the barrier blade 20 'is formed of a metal material. Since the magnetic substance powder is mixed in the resin material, the manufacturing cost and the part management cost can be reduced compared with the case where a ferromagnetic substance is retrofitted, and the cost of the entire apparatus can be reduced.

In this embodiment, the case where the ferromagnetic powder is mixed into the resin material forming the barrier blade 20 ′ has been shown, but the metal piece made of the ferromagnetic material is positioned in the region of the end faces 23 and 24. It may be embedded locally in the resin material.
In this embodiment, the permanent magnet 30 'is provided on the substrate 10 and the ferromagnetic material is mixed into the barrier blade 20'. Conversely, the ferromagnetic material is provided on the substrate 10 and the barrier blade is provided. Alternatively, it may be formed of a resin material in which a permanent magnet is mixed or embedded.

FIG. 6 is a view viewed in the same manner as FIG. 4 and shows still another embodiment of the camera blade driving device according to the present invention. The above-described implementation is performed except that the permanent magnet 30 ″ is changed. Since it is basically the same as the form, the same reference numerals are assigned to the same components, and descriptions thereof are omitted.
In this apparatus, the attachment position (attachment angle) of the permanent magnet 30 ″ provided on the substrate 10 with respect to the substrate 10 can be adjusted.
According to this, when the barrier blade 20 is at a position facing the opening 10a, the permanent magnet 30 ″ attached to the eccentric shaft is rotated to adjust the separation distance between the permanent magnet 30 ″ and the end surface 23. The strength of the magnetic attractive force generated between the two can be adjusted as appropriate. As a result, it is possible to smoothly operate the barrier blade 20 while adjusting the holding force of the barrier blade 20 to an appropriate size.

  In this embodiment, in the configuration in which the permanent magnet 30 ″ is provided on the substrate 10 and the ferromagnetic material is provided on the barrier blade 20, the mounting position of the permanent magnet 30 ″ is adjustable. In the configuration in which the ferromagnetic material is provided on the barrier blade and the permanent magnet is provided on the barrier blade, the position of the ferromagnetic material may be adjusted.

  FIG. 7 is a view seen in the same manner as FIG. 4 and shows still another embodiment of the camera blade driving device according to the present invention. The link member 25 is adopted as a part of the barrier blade 20 ″. Then, the permanent magnet 30 ″ ″ is provided on the link member 25, and the ferromagnetic material is placed at a position where a gap is provided between the permanent magnet 30 ″ ″ and the barrier blade 20 in contact with the stopper 11 on the substrate 10. Since the metal piece 70 is basically the same as the above-described embodiment except that the metal piece 70 is implanted, the same components are denoted by the same reference numerals and description thereof is omitted.

In this apparatus, all the barrier blades 20 ″ are made of a resin material. The link member 25 is swingably supported by the support shaft 12 with respect to the substrate 10 and is connected to the drive pin 41a and the barrier blade 20 ″. When the drive pin 41a reciprocates, the link member 25 swings, and the barrier blade 20 ″ opens and closes the opening 10a.
Here, since the barrier blade 20 ″ is indirectly held via the link member 25, the degree of freedom in design of the barrier blade 20 ″ (for example, all of them can be formed of a resin material, or permanent magnet or ferromagnetic). The shape can be freely set without considering the position where the body is provided), or the degree of freedom of arrangement of the electromagnetic drive source 40 can be increased, and the required form can be set.
A metal piece made of a ferromagnetic material may be provided on the link member, and a permanent magnet may be provided on the substrate.

In the embodiment described above, the case where the barrier blades 20, 20 ′, 20 ″ are employed as the blade members is shown, but the present invention is not limited to this, and the shutter blades that open and close the opening 10a, or A diaphragm blade that narrows the opening 10a to a predetermined diameter may be employed.
Even in the case of these shutter blades or diaphragm blades, the shutter blades or diaphragm blades can be prevented from freely closing or narrowing the aperture when receiving an impact force or the like in a shooting standby state.
Furthermore, although one barrier blade 20, 20 ′, 20 ″ is shown as the blade member, the present invention is not limited to this, and a pair or a plurality of barrier blades, shutter blades, aperture blades, You may employ | adopt this invention in the structure provided with an ND filter blade | wing, an infrared-light cut filter blade | wing, etc.

In the above embodiment, the case where the permanent magnets 30, 30 ′, 30 ″ provided on the substrate 10 are arranged in the vicinity of the stopper 11 is shown, but the present invention is not limited to this. It may be provided in the region. For example, the permanent magnets 30, 30 ′, 30 ″ may be embedded on the back side of the illustrated substrate 10 so as to face the ferromagnetic material.
In the said embodiment, although the case where this invention was applied about the case where a blade member rock | fluctuates was shown, it is not limited to this, It can apply also to the blade member which reciprocates linearly.

In the above embodiment, the case where this apparatus is mounted on a digital camera has been described. However, the present invention is not limited to this, and the present invention is also applied to a silver salt film type camera and other cameras. Also good.
In the above embodiment, the case where the iron pin 44 is provided in the electromagnetic drive source 40 has been shown. However, the present invention may be adopted in a configuration in which the iron pin 44 is not provided and detent torque is not generated.

  As described above, the camera blade driving device according to the present invention reliably achieves the structure where the blade member faces the opening or the retracted position away from the opening while achieving simplification of the structure and size reduction of the device. Since it can be held, it can be mounted on a small, portable digital camera, etc., and it can be portable if it can receive a shocking force from the outside and cause the blade member to malfunction. It is useful not only for fixed cameras.

1 is a plan view showing a state in which a barrier blade is in a position facing an opening, showing an embodiment of a camera blade driving device according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a camera blade driving device according to an embodiment of the present invention, in a state where a barrier blade is at a position deviated from an opening. It is sectional drawing of the apparatus shown in FIG.1 and FIG.2. FIG. 2 is a partial view showing a part of the inside of the apparatus shown in FIG. 1. It is the fragmentary figure which shows other embodiment of the blade drive device for cameras which concerns on this invention. FIG. 6 is a partial view showing still another embodiment of a camera blade driving device according to the present invention. FIG. 6 is a partial view showing still another embodiment of a camera blade driving device according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Board | substrate 10a Opening part 10b Flat surface 11 Stopper 12 Support shaft 13 Through-hole 20, 20 ', 20''Barrier blade | wing (blade member)
21 circular hole 22 long hole 23, 24 end face 25 link member 30, 30 ′, 30 ″, 30 ″ ″ permanent magnet 40 electromagnetic drive source 41 rotor 41a drive pin 42 coil 43 yoke 50 cover 60 position sensor 70 metal piece ( Ferromagnetic)

Claims (7)

A substrate having an opening, a blade member supported movably between a position facing the opening with respect to the substrate and a retracted position outside the opening, and a position or retracting the blade member A blade drive device for a camera, comprising: a stopper provided on the substrate for positioning at a position; and an electromagnetic drive source for driving the blade member,
The blade member is provided with one of a permanent magnet and a ferromagnetic material to hold the blade member at the facing position or the retracted position by a magnetic attractive force generated in a non-contact manner in the end face direction of the blade member. Is provided with the other of a permanent magnet and a ferromagnetic material,
A blade drive device for a camera. The other of the permanent magnet and the ferromagnetic material is provided in the vicinity of the stopper.
The camera blade driving device according to claim 1. The substrate is provided with the permanent magnet,
The blade member is formed of the ferromagnetic material.
The camera blade driving device according to claim 1, wherein the camera blade driving device is provided. The substrate is provided with one of the permanent magnet and the ferromagnetic material,
The blade member is formed of a resin material in which the other of the permanent magnet and the ferromagnetic material is mixed or embedded,
The camera blade driving device according to claim 1, wherein the camera blade driving device is provided. The blade member includes a link member that transmits a driving force of the electromagnetic drive source,
The link member is provided with one of the permanent magnet and the ferromagnetic material,
The substrate is provided with the other of the permanent magnet and the ferromagnetic material.
The camera blade driving device according to claim 1, wherein the camera blade driving device is provided. The permanent magnet or the ferromagnetic material provided on the substrate has an adjustable mounting position with respect to the substrate.
6. A blade driving device for a camera according to claim 1, wherein The blade member is a barrier blade that opens and closes the opening, a shutter blade that opens and closes the opening, or a diaphragm blade that restricts the opening to a predetermined aperture.
The camera blade driving device according to claim 1, wherein the camera blade driving device is a camera blade driving device.

Images