JP2019049671A - Blade drive device, imaging device and portable electronic apparatus - Google Patents

Abstract

To provide a blade drive device in which the thickness in the direction of the optical axis is reduced.SOLUTION: Provided is a blade drive device, comprising: a base member for holding a blade member that is movable so as to shield at least a portion of an opening centering around the optical axis; a lens barrel provided with a slit into which the blade member is insertable and attached to the base member; and an actuator for driving the blade member into an open state or a closed state. At least a portion of the opening is shielded by the blade member when the blade member is in a closed state and the opening is not shielded by the blade member and the tip of the blade member is inserted into the slit when the blade member is in an open state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a blade drive device for driving a blade, and the like.

  2. Description of the Related Art A diaphragm device, a shutter, a filter switching device, and the like are conventionally known which adjust the size of an exposure opening or control the opening and closing of the exposure opening by driving a blade. An example of the background art related to such a device is disclosed in Patent Document 1. In the lens device of Patent Document 1, the diaphragm device is inserted into two insertion holes provided on the side surface of the barrel body.

JP 2004-348030 A

  However, when such a lens barrel is used in a camera module for a cellular phone, the thickness (length) in the optical axis direction of the lens barrel becomes a problem. Even if the distance between the diaphragm mechanism and the lens is narrowed, for example, the thickness in the optical axis direction of the entire lens barrel is increased due to the thickness in the optical axis direction of the diaphragm mechanism.

  The present invention adopts the following means in order to solve the above problems. In the following description, in order to facilitate understanding of the invention, reference numerals and the like in the drawings are appended in parentheses, but each component of the present invention is not limited to the appended ones. It should be interpreted broadly to the extent that the vendor can understand technically.

One means of the present invention is
A base member (12, 50) holding a movable blade member (24, 60) so as to shield at least a part of the opening centered on the optical axis;
A lens barrel (28) provided with a slit (38) into which the blade member can be inserted and attached to the base member;
An actuator (16, 22) for driving the blade member into an open state or a closed state;
When the blade member is in a closed state, at least a portion of the opening is shielded by the blade member,
When the blade member is in the open state, the opening is not shielded by the blade member, and the tip of the blade member is inserted into the slit.
It is a blade drive device.

  In the blade drive device having the above configuration, the blade member can reliably move in the lens barrel without using a member that supports the blade member leading to an increase in the thickness of the blade drive device in the optical axis direction. As a result, compared to the configuration using the member that supports the blade members, it is possible to configure a relatively small blade drive device having a small thickness in the optical axis direction (short in the optical axis direction).

In the above blade driving device, preferably
A lever member (14) coupled to the blade member;
And a holding member (18) for holding the lever member pivotably to the base,
The actuator is
A magnet (16) held by the lever member (14);
And a coil (22) wound around the holding member so as to surround the magnet and the lever member.

  According to the above-mentioned blade drive device, the lever member holds the magnet, and the coil is surrounded by the periphery, so that the magnet and the coil constituting the electromagnetic actuator are disposed at completely different parts from the lever member. As compared to the case, the magnet, the coil and the lever member can be arranged relative to the base member relatively compactly.

In the above blade driving device, preferably
A connecting portion (14b, 24a) connecting the blade member and the lever member;
It further has a connection holding member (26) which holds the connection between the blade member and the lever member by the connection portion.

  According to the above blade drive device, by forming the lever member and the blade member as separate members, it is possible to attach the blade member after winding the coil around the base member, thus facilitating the assembly of the blade drive portion. Can.

In the above blade driving device, preferably
The blade member includes an operation surface (24b) and a step surface (24c) one step lower than the operation surface in the optical axis direction,
In the connection holding member, one surface in the optical axis direction faces the step surface, and the other surface in the optical axis direction is positioned rearward of the working surface in the optical axis direction.

  According to the above blade drive device, the connection holding member for holding the connection between the lever member and the blade member can be provided on the base member without jumping out from the working surface in the optical axis direction.

In the above blade driving device, preferably
The blade member is integrally formed with the lever member.

  According to the above blade drive device, by integrally forming the lever member on the blade member, the base member can stably hold the blade member without using the above-described connection holding portion. Thereby, the number of parts of the blade driving member can be reduced, and the material cost and the like can be reduced.

In the above blade driving device, preferably
The thickness of the blade member in the optical axis direction is 20% or more and 95% or less of the width of the slit.

  According to the blade drive device, the blade member can be appropriately driven without using a member for supporting the blade member, and the thickness of the blade drive device in the optical axis direction can be reduced.

  Moreover, the present invention includes an imaging device provided with the above-mentioned blade drive device.

  According to the imaging device, by adopting the blade driving device which is thinned in the optical axis direction, it is possible to achieve thinning and downsizing of the imaging device in the optical axis direction.

  Further, the present invention includes a portable electronic device provided with the above-mentioned blade driving device.

  According to the above-mentioned imaging device, by adopting a blade driving device which is thinned in the optical axis direction, it is possible to achieve thinning and downsizing of the portable electronic device in the optical axis direction.

FIG. 1 is an exploded perspective view of a blade driving device according to an embodiment of the present invention. FIG. 2 is a plan view of the blade driving unit shown in FIG. FIG. 3 is another plan view of the blade driving unit shown in FIG. FIG. 4 is another plan view of the blade driving unit shown in FIG. FIG. 5 is a cross-sectional view of the blade driving unit shown in FIG. 4 at a position A-A. 6 is another plan view of the blade driving unit shown in FIG. FIG. 7 is another plan view of the blade driving unit shown in FIG. FIG. 8 is a perspective view of the lens barrel shown in FIG. FIG. 9 is a plan view of the blade driving device shown in FIG. FIG. 10 is another plan view of the blade driving device shown in FIG. FIG. 11 is a side view of the blade driving device shown in FIG. FIG. 12 is a cross-sectional view of the blade driving device shown in FIG. 9 at a position B-B. FIG. 13 is another plan view of the blade driving device shown in FIG. FIG. 14 is a cross-sectional view of the blade driving device shown in FIG. 13 at a position C-C. FIG. 15 is an exploded perspective view of a blade driving device according to another embodiment of the present invention. FIG. 16 is a plan view of the blade driving unit shown in FIG. FIG. 17 is another plan view of the blade driving unit shown in FIG. FIG. 18 is another plan view of the blade driving unit shown in FIG. FIG. 19 is a plan view of the blade driving device shown in FIG. FIG. 20 is another plan view of the blade driving device shown in FIG. FIG. 21 is a view showing an example of an imaging device and a portable electronic device provided with the blade driving device shown in FIG. 1 or 15.

Embodiments according to the present invention will be specifically described with reference to the drawings according to the following configuration. However, the embodiments described below are merely examples of the present invention, and the technical scope of the present invention is not to be interpreted in a limited manner. In the drawings, the same components are denoted by the same reference numerals, and the description thereof may be omitted.
1. Embodiment 1
2. Embodiment 2
3. Supplementary items

<1. Embodiment 1>
In the blade driving device 10 of the present embodiment, the blade member 24 is moved so as to block at least a part of the opening centered on the optical axis. In the blade drive device 10, the lens barrel 28 is attached to the base member 12 holding the blade member 24, and the blade member 24 is driven to an open state or a closed state by an electromagnetic actuator. In the closed state, at least a part of the opening is shielded by the blade member 24. On the other hand, in the open state, one of the features is that the opening is not shielded by the blade member 24 but is opened and the tip of the blade member is inserted into the slit 38 of the lens barrel 28. Hereinafter, the blade drive device 10 of the present embodiment will be specifically described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a blade drive device 10 of the present embodiment.

  As shown in FIGS. 1 to 5 and the like, the blade drive device 10 according to the present embodiment includes the base member 12, the lever member 14, the magnet 16, the holding member 18, the magnetic body 20, the coil 22, the blade member 24, and connection holding. The member 26 and the lens barrel 28 are configured. In the present specification, in the blade drive device 10, the base member 12, the lever member 14, the magnet 16, the holding member 18, the magnetic body 20, the coil 22, the blade member 24 and the connection holding member 26 except the lens barrel 28 are It may be collectively called a blade drive part.

  The base member 12 is made of resin and holds the blade member 24 movably. The base member 12 includes a first fitting hole 12a into which the rotation pin 14a of the lever member 14 is fitted, an elongated hole 12b through which the connecting pin 24a of the blade member 24 passes, and a part of the coil 22 It comprises 1 winding part 12c etc.

  The lever member 14 is made of resin and is a member for driving the blade member 24. The lever member 14 includes two rotation pins 14 a serving as a rotation center of the lever member 14, a connection portion 14 b connected to the connection pin 24 a of the blade member 24, and a housing portion 14 c for holding the magnet 16. .

  The magnet 16 is magnetized to two poles of an S pole and an N pole, and constitutes an electromagnetic actuator together with a coil 22 described later.

  The holding member 18 is made of resin, and holds the lever member 14 so as to be able to pivot, and the coil 22 is wound. The holding member 18 includes a second fitting hole 18a into which the rotation pin 14a of the lever member 14 is fitted, and a second winding portion 18b around which another part of the coil 22 is wound.

  The magnetic body 20 is formed of, for example, a magnetic body such as metal, and is used to hold the lever member 14 in the initial position. The magnetic body 20 is configured to include two ridges 20 a that are bent so as to cover the first winding portion 12 c and the second winding portion 18 b.

  The coil 22 is formed by winding a conductive wire around the first winding portion 12 c of the base member 12 and the second winding portion 18 b of the holding member 18. The coil 22 constitutes an electromagnetic actuator together with the magnet 16 described above, and drives the blade member 24 via the lever member 14.

  The wing member 24 is formed of a member that shields light, and is used to shield at least a part of the opening centered on the optical axis. Such a blade member 24 includes a connection pin 24a, an operation surface 24b, a step surface 24c, and a throttle opening 24d. The connecting pin 24 a is connected to the lever member 14. The operating surface 24 b shields at least a part of the opening. The step surface 24c is provided between the connecting pin 24a and the actuating surface 24b, and is lowered by one step rearward in the optical axis direction with respect to the actuating surface 24b. The aperture 24d is provided on the operating surface 24b.

  In addition, since the blade member 24 has a diaphragm opening 24d and functions as a diaphragm in an imaging device on which the blade drive device 10 is mounted, it may be referred to as a diaphragm blade. Further, the connection pin 24a may be referred to as a drive pin because the driving force of the electromagnetic actuator is transmitted. Further, the blade member 24 of the other embodiment may be a shutter blade covering the entire exposure opening, or a filter blade using an IR cut filter or the like.

  The connection holding member 26 is a member for holding the connection between the lever member 14 and the blade member 24. Further, in the connection holding member 26, one surface in the optical axis direction faces the step surface 24c, and the other surface in the optical axis direction is positioned rearward of the actuating surface 24b in the optical axis direction.

  Here, the procedure for assembling the blade driving unit will be described. First, as shown in FIGS. 1 to 5, the magnet 16 is disposed in the housing portion 14 c of the lever member 14. Next, the rotation pin 14 a on one side of the lever member 14 holding the magnet 16 is fitted into the first fitting hole 12 a of the base member 12. Subsequently, the holding member 18 is attached to the base member 12 so that the rotation pin 14 a on the other side is fitted with the second fitting hole 18 a of the holding member 18. As a result, the lever member 14 (magnet 16) is sandwiched between the base member 12 and the holding member 18. The magnet 16 and the coil 22 may be collectively referred to as an electromagnetic actuator.

  As described above, when the lever member 14 holds the magnet 16 and the coil 22 surrounds the periphery of the magnet 16, the magnet and the coil that constitute the electromagnetic actuator are disposed at portions different from the lever member. In comparison, the magnet 16, the coil 22 and the lever member 14 can be arranged relatively compactly with respect to the base member 12.

  Subsequently, the wire of the coil 22 is wound around the first winding portion 12 c of the base member 12 and the second winding portion 18 b of the holding member 18. Thus, by providing the coil 22, the holding member 18 can be more reliably fixed to the base member 12. And the magnetic body 20 is attached so that a part of coil 22 provided in this way may be covered.

  Next, in the blade member 24, the connection pin 24 a is fitted in the hole formed in the connection portion 14 b of the lever member 14 through the long hole 12 b of the base member 12. The connection holding member 26 is attached to the base member 12 in order to maintain the connection between the lever member 14 and the blade member 24.

  As described above, by forming the lever member 14 and the blade member 24 as separate members, the blade member 24 can be attached after the coil 22 is wound around the base member 12, so that the assembly of the blade drive unit is facilitated. be able to.

  As described above, in the state where the blade driving unit is assembled, a magnetic attraction force is generated between the magnet 16 provided on the lever member 14 and the magnetic body 20, and the magnet 16 is attracted to the magnetic body 20. Since the magnet 16 is held by the lever member 14, the lever member 14 is moved by the magnetic attraction between the magnet 16 and the magnetic body 20. Specifically, the lever member 14 is stopped in a state where each end of the magnet 16 is in close proximity to the two ridges 20 a of the magnetic body 20. As shown in FIGS. 2 and 3, the position at which the lever member 14 stops in this manner is the initial position of the lever member 14.

  Further, when power is supplied to the coil 22, the coil 22 has a magnetic force, and the interaction between the magnetic force and the magnetic force of the magnet 16 drives and rotates the lever member 14. When the lever member 14 is driven, the blade member 24 connected to the lever member 14 is driven. For example, when the blade member 24 moves from the initial position, the state shown in FIGS. 6 and 7 is obtained. On the other hand, when the coil 22 is energized in the reverse direction to the above and the blade member 24 is driven in the reverse direction to the above, the state shown in FIGS. 2 and 3 is obtained.

  The magnet 16 and the coil 22 of the present embodiment function as a voice coil motor (hereinafter referred to as "VCM"). Then, the driving force is given to the lever member 14 by the VCM.

  In addition, since the blade member 24 has a predetermined thickness in the optical axis direction to the extent that it does not bend during operation, it can operate without having a support member that supports its own operation.

  The lens barrel 28 includes a first lens holding portion 32, a second lens holding portion 34, a connecting portion 36, and a barrel base portion 40. The first lens holding unit 32 holds the first lens group. The second lens holding unit 34 holds the second lens group. The connecting portion 36 connects the first lens holding portion and the second lens holding portion. The barrel base 40 fixes the lens barrel 28 to the base member 12. Further, a slit 38 is formed between the first lens holding portion 32 and the second lens holding portion 34 in the optical axis direction. The opening provided in the first lens holding unit 32 is the exposure opening in the blade driving device 10 of this embodiment.

  The first lens holding unit 32 and the second lens holding unit 34 respectively hold a lens group configured by at least one lens. When the blade member 24 is inserted into the slit 38, the blade member 24 is placed between the two lens groups.

  As shown in FIGS. 9 and 10, when the lens barrel 28 is fixed to the blade drive portion with the lever member 14 at the initial position, the blade drive device 10 is in the open state. In the open state, the opening is not blocked by the blade member 24 and is fully open, and the tip of the blade member 24 is inserted into the inside of the lens barrel 28.

  Here, as shown in FIGS. 11 and 12, the actuating surface 24b of the blade member 24 is lower than the slit-side surface of the first lens holding portion 32 in the optical axis direction (located rearward in the optical axis direction Yes). The step surface 24c is made to be lower than such a working surface 24b in the optical axis direction (and to be positioned rearward in the optical axis direction). By doing this, the connection holding member 26 for holding the connection between the lever member 14 and the blade member 24 can be provided on the base member 12 without jumping out from the operation surface 24 b in the optical axis direction.

  As shown in FIG. 13, when the blade member 24 moves, a part of the opening of the lens barrel 28 is covered by the blade member 24 to be in a small aperture state. The small aperture state of the blade drive device 10 may be referred to as a closed state.

  Further, as shown in FIG. 14, the thickness of the blade member 24 in the optical axis direction is designed to have a relationship of 20% or more and 95% or less with respect to the width of the slit 38. By designing in this manner, the blade member 24 can be appropriately driven without using a member that supports the blade member 24, and the thickness of the blade drive device 10 in the optical axis direction can be reduced.

  As can be understood from the above description, according to the configuration of the present embodiment, the blade member 24 is a lens barrel 28 without using a member for supporting the blade member 24 leading to an increase in the thickness of the blade drive device 10 in the optical axis direction. You can make it work inside.

<2. Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to the drawings. The blade drive device 10 according to the second embodiment is different from the blade drive device 10 according to the first embodiment in that the blade member and the lever member are integrally formed, and the other configurations are the same. . In the following description, the points in which the other embodiments are different from the first embodiment will be described, and the description of the same configuration and the like as the first embodiment will be omitted.

  As shown in FIGS. 15 to 17 and the like, the blade driving unit of the second embodiment includes the base member 50, the magnet 16, the holding member 18, the magnetic body 20, the coil 22, and the blade member 60.

  Similar to the base member 12 of the first embodiment, the base member 50 includes the third fitting hole 50a and the third winding portion 50c, and an operation portion 50b in which a connecting shaft 60c of the wing member 60 described later can be arbitrarily moved. including. The operating portion 50b points to a portion where the base member 50 is recessed in the Y-axis direction.

  The blade member 60 is obtained by integrating the lever member 14 and the blade member 24 of the first embodiment. Therefore, the blade member 60 includes the same rotation pin 60a and housing portion 60b as the lever member 14 of the first embodiment, and has the same operating surface 60d and throttle opening 60e as the blade member 24 of the first embodiment. And the blade member 60 of Embodiment 2 has the connecting shaft 60c which connects the part corresponded to a blade member, and the part corresponded to a lever member. The connecting shaft 60c is in the shape of a rod extending in the optical axis direction, and a portion corresponding to the blade member is connected to one end, and a portion corresponding to the lever member is connected to the other end.

  Subsequently, a procedure for assembling the blade driving unit of the second embodiment will be described. As shown in FIGS. 15 to 18 and the like, the magnet 16 is held by the housing portion 60b of the blade member 60, and the rotation pin 60a of the blade member 60 is fitted into the third fitting hole 50a of the base member 50. At this time, the rotary pin 60a can be fitted into the third fitting hole 50a by inserting the connecting shaft 60c from the lower side of the actuating portion 50b of the base member 50. Further, as in the first embodiment, after attaching the holding member 18 to the base member 50, the wire of the coil 22 is wound around the second winding portion 18b of the holding member 18 and the third winding portion 50c of the base member 50. Be done. At this time, as shown in FIG. 17, the blade member 60 is retracted from the winding position of the wire in the coil 22 so that the blade member 60 does not get in the way when the wire of the coil 22 is wound. Make it easy to turn.

  Then, when the VCM operates in the blade drive unit of the second embodiment assembled in this manner, the blade member 60 is in the state of FIG. 16 or FIG. Furthermore, when the VCM is driven in a state where the lens barrel 28 is attached to the blade driving unit, the open state shown in FIG. 19 or the closed state shown in FIG.

  As can be understood from the above description, in the blade driving device 10 of the present embodiment, the lever member is integrally formed with the blade member 60, so that the base member 50 can be used without using the connection holding member 26 used in the first embodiment. The blade member 60 can be stably held. Thereby, the number of parts of the blade drive member 10 can be reduced, and the material cost and the like can be reduced.

  <3. Additional Notes>

  The specific description of the embodiment of the present invention has been described above. In the above description, the description is merely an embodiment, and the scope of the present invention is not limited to the one embodiment, and can be broadly interpreted to a range that can be grasped by those skilled in the art.

  In addition, the blade drive device 10 which drives the blade member 24 which has an aperture opening may be called an aperture device. Further, the blade drive device 10 for driving the shutter blade is sometimes referred to as a shutter, and the blade drive device 10 for driving the filter blade may be referred to as a filter switching device. That is, it can be said that the blade drive device 10 of the present invention is a generic term for an aperture device, a shutter, or a filter switching device.

  Further, instead of the VCM, another actuator such as a motor having a shape in which the magnet rotor is sandwiched by a U-shaped yoke may be used as the blade drive source.

  The above-described blade drive device 10 may be used as a component constituting an imaging device 80 for a portable information device 90 such as a so-called smartphone, a so-called feature phone, or a tablet device as shown in FIG. 21, for example.

  The present invention is effectively utilized as a blade driving device for driving a blade member in particular.

DESCRIPTION OF SYMBOLS 10 ... Feather drive device 12 ... Base member 12a ... 1st fitting hole 12b ... Long hole 12c ... 1st winding part 14 ... Lever member 14a ... Rotation pin 14b ... Connecting part 14c ... Accommodation part 16 ... Magnet 18 ... Holding member 18a: second fitting hole 18b: second winding portion 20: magnetic body 20a: ridge portion 22: coil 24: blade member 24a: connecting pin 24b: working surface 24c: step surface 24d: aperture opening 26: connecting holding member 28 ... lens barrel 32 ... first lens holding section 34 ... second lens holding section 36 ... connecting section 38 ... slit 40 ... lens base section 50 ... base member 50a ... third fitting hole 50b ... operating section 50c ... third volume Rotating part 60 ... vane member 60a ... rotating pin 60b ... accommodation part 60c ... connecting shaft 60d ... working surface 60e ... Ri opening

Claims (8)

A base member holding a movable blade member so as to shield at least a part of the opening centered on the optical axis;
A lens barrel provided with a slit into which the blade member can be inserted and attached to the base member;
An actuator for driving the blade member to an open state or a closed state;
When the blade member is in a closed state, at least a portion of the opening is shielded by the blade member,
When the blade member is in the open state, the opening is not shielded by the blade member, and the tip of the blade member is inserted into the slit.
Blade drive. A lever member connected to the blade member;
And a holding member for holding the lever member on the base so as to be able to pivot.
The actuator is
A magnet held by the lever member;
And a coil wound around the holding member so as to surround the magnet and the lever member.
The blade drive device according to claim 1. A connecting portion connecting the blade member and the lever member;
And a connection holding member for holding the connection between the blade member and the lever member by the connection portion.
The blade drive device according to claim 1 or 2. The blade member includes an operation surface and a step surface which is lower by one step rearward in the optical axis direction than the operation surface.
In the connection holding member, one surface in the optical axis direction faces the step surface, and the other surface in the optical axis direction is positioned rearward of the working surface in the optical axis direction.
The blade drive device according to claim 3. The blade member is integrally formed with the lever member.
The blade drive device according to claim 1 or 2. The thickness of the blade member in the optical axis direction is 20% or more and 95% or less of the width of the slit.
The blade drive device according to any one of claims 1 to 5.   An imaging device provided with the blade drive device according to any one of claims 1 to 6.   A portable electronic device comprising the blade driving device according to any one of claims 1 to 6.

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