JPH10133090A - Lens driving mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately move a lens in an optical axis direction with a small number of parts, besides, without necessitating the highly accurate assemblage. SOLUTION: As for a motor main body 50, a male screw is formed on the rotor shaft 51, and a nut member 53 with which the rotor shaft 51 is engaged is fixed in a motor casing. The rotor shaft 51 is moved back and forth with rotation. To one end part 51a of the rotor shaft 51, the other end part 61b of a flexible wire 61 is connected through a connector 62. The wire 61 is stored in a guide tube 63 for guiding the wire 61 so as to be moved on a previously defined course. The other end part 61b of the wire 61 projects from the guide tube 63 and the end part 61b comes into contact with a lens frame 3a which is guided by a guide shaft 2 so as to be moved in the optical axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens driving mechanism for moving a lens in the direction of its optical axis.

[0002]

2. Description of the Related Art As a conventional lens driving mechanism, for example, there is one as shown in FIG. The lens driving mechanism includes a lens frame 3 for holding a lens 4, a guide shaft 2 for guiding the lens frame 3 movably in the optical axis direction of the lens 4,
A motor 5 having a rotating output shaft; and a feed screw 59 extending in a direction parallel to the optical axis C and having a male screw formed on the outer periphery.
And a nut member 58 formed with a female screw to be screwed with the feed screw 59, and the fixed cylinder 1 covering these nut members. The nut member 58 is embedded in the lens frame 3 and moves integrally with the lens 4 and the lens frame 3. When the feed screw 59 is rotated by the drive of the motor 5, the nut member 5 is rotated.
8 moves in a direction parallel to the optical axis C, and accordingly, the lens frame 3 and the lens 4 move in the optical axis direction.

[0003]

However, in the prior art, a nut member 58 and a feed screw 59 are required to move the lens 4 in the optical axis direction, and the number of parts increases. Further, since the lens frame 3 is firmly guided by the guide shaft 2 so as to be able to move accurately only in the optical axis direction, unless the feed screw 59 is arranged exactly in parallel with the optical axis C, the nut member 58 is not provided. As a result, the rotation of the feed screw 59 becomes tight and a large load is applied to the motor 5. That is, unless the relative positional relationship between the nut member 58, the feed screw 59, and the motor 5 is extremely high,
Unnecessary binding force is generated, and a large load is applied to the motor 5. As described above, the conventional technique has a problem that the number of parts is increased and high assembling accuracy is required, so that the number of assembling steps is extremely increased. Further, since it is necessary to dispose the motor on the axis of the feed screw 59 and near the object to be driven (lens frame), the degree of freedom in design is restricted. There are also problems such as easy transmission to objects.

The present invention has been made in view of such conventional problems, and has a small number of parts, a small number of parts, and a lens having an optical axis without assembling with high accuracy. It is an object of the present invention to provide a lens driving mechanism that can be moved in the direction, and as a result, the number of assembling steps can be reduced.

[0005]

A lens driving mechanism for achieving the above object comprises a lens frame for holding a lens, guide means for guiding the lens frame movably in the direction of the optical axis of the lens, and An actuator for moving the lens in the optical axis direction together with the lens frame, wherein the actuator has an actuator body having an operating part that reciprocates in a fixed direction, and has flexibility, and one end has
The other end is in contact with the lens frame, or directly or indirectly connected to the lens frame in a direction parallel to the optical axis so as to be relatively immovable, and the other end is in contact with the operating portion of the actuator body. Or a wire that is directly or indirectly connected to the operating unit so as to be relatively immovable in the predetermined direction, and a guide member that guides the wire so as to be movable on a predetermined path. It is characterized by doing.

Here, the actuator body extends in the predetermined direction, and has a male screw formed on a part of the outer periphery thereof. A rotor attached to the rotor shaft so as to be relatively movable in a direction in which the rotor shaft extends, a stator arranged on the outer periphery of the rotor and rotating the rotor, and a casing covering the rotor and the stator. And a nut member fixed to the casing and formed with a female screw with which the male screw of the rotor shaft is screwed.

The actuator body may be a hydraulic cylinder whose output shaft moves forward or backward, or a linear electromagnetic motor whose operating part moves linearly.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS.

First, a lens driving mechanism according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the lens driving mechanism includes a lens frame 3a for holding a lens 4 and a lens frame 3a.
A plurality of guide shafts 2 for movably guiding in the optical axis direction of
, A motor 5a for moving the lens frame 3a in the optical axis direction, and a fixed cylinder 1a for covering these.

The lenses include a first lens 4a, a second lens 4, and a third lens 4b in order from the subject side to the camera body side. Both the first lens 4a and the third lens 4b are connected to a fixed barrel 1a via a lens frame (not shown).
It is fixed to. A moving space 12 for the second lens frame 3a to be moved in the optical axis direction is formed in an intermediate portion of the fixed barrel 1a. The first lens frame moving space 12 extends in a direction perpendicular to the optical axis C and away from the optical axis C.
It is formed of a wall 13 and a second wall 14 and a peripheral wall 15 connecting outer peripheral ends of the first wall 13 and the second wall 14 to each other. On the camera body side of the peripheral wall 15, a motor storage chamber 16 in which the motor 5a is stored is formed. On the camera body side of the fixed cylinder 1a, a mount portion 11 for connecting to the camera body is provided.
Are formed.

Each of the plurality of guide shafts 2, 2,.
It extends in a direction parallel to the optical axis C, and is fixed to the first wall 13 and the second wall 14 of the fixed cylinder 1 at both ends. Lens frame 3
a has a guide groove 31 into which the concave guide shaft 2 is fitted on the inner peripheral side, and a guide shaft insertion hole 32 through which the guide shaft 2 is inserted.
And a driving force acting portion 33 projecting in the outer peripheral direction and acting on the driving force from the motor 5a. In the driving force acting portion 33, a wire contact surface 34 perpendicular to the optical axis C is formed on the camera body side, and a spring contact surface 35 perpendicular to the optical axis C is formed on the subject side. ing.
The spring contact surface 35 of the driving force acting portion 33 and the first
A coil spring (biasing means) 6 for biasing the lens frame 3a toward the camera body is disposed between the wall 13 and the wall.

As shown in FIG. 2, the motor 5a has a motor body 50 having a rotor shaft (moving portion) 51 which rotates and advances and retracts, a flexible wire (wire) 61, a wire 61 and a rotor shaft. A connecting tool 62 for connecting the connecting tool 51 and the wire 61 and a guide tube 63 that covers the connecting tool 62 and defines a moving path of the wire 61 are provided.

The motor body 50 includes a rotor shaft 51 having an external thread formed on one end side, a rotor 52 attached to the rotor shaft 51, and an outer periphery of the rotor 52. Stator 55, a hollow cylindrical casing 56 a covering the rotor 52 and the stator 55, a flange 56 b for closing an opening on one end side of the hollow cylindrical casing 56 a, and a bearing 54 for supporting the rotor shaft 51. And a nut member 53 formed with a female screw into which a male screw of the rotor shaft 51 is screwed. At one end of the rotor shaft 51, a connecting protrusion 51a into which the connecting tool 62 is fitted is formed. At the center of the rotor shaft 51, a key 51c is formed which protrudes in the outer peripheral direction and extends in the direction in which the rotor shaft 51 extends.
As shown in FIG. 3, the rotor 52 has a cylindrical shape, and N poles and S poles are alternately and regularly excited in the direction around the axis. That is, the motor main body 50 is a permanent magnet type (PM type) stepping motor. This rotor 5
2, a through hole 52b through which the rotor shaft 51 is inserted is formed. The inner peripheral surface of the through hole 52b has a through hole 5
2b extends in the direction through which the key 5b of the rotor shaft 51 extends.
A key groove 52c into which 1c can be fitted is formed. Therefore, when the rotor shaft 51 is passed through the through hole 52b of the rotor 52 and the key 51c of the rotor shaft 51 is engaged with the key groove 52c of the rotor 52, the rotor shaft 51
2, the rotor 52 is attached to the rotor 52 so as to be non-rotatable and relatively movable in the direction in which the rotor shaft 51 extends. The stator 55 is fixed to the inner peripheral surface of a hollow cylindrical casing 56 a so as to face the outer peripheral surface of the rotor 52. The stator 55 is a two-phase coil and is excited so that the rotor 52 rotates around the rotor axis. The nut member 53 is fixed to a flange 56b fixed to one end of the casing 56a. The bearing 54 is fixed to the other end of the casing 56a. The bearing 54 supports the other end 51 b of the rotor shaft 51 so as to be rotatable and movable in the direction in which the rotor shaft 51 extends.

The wire 61 has flexibility but very little elastic deformation. That is, the wire 61 is bent, for example, when a longitudinal load is applied to the end of the wire 61, but the amount of elastic deformation in the longitudinal direction is substantially nil. Wire 61
A hemispherical contact end 61a is formed at one end of the wire 61, and a connecting protrusion 61b into which the connecting tool 62 is fitted is formed at the other end of the wire 61. Connector 62
Has a hollow cylindrical shape, in which a connecting projection 51 a formed at one end of the rotor shaft 51 and a wire 61 are formed.
The connection protrusion 61b formed on the other end of the wire is fitted to connect the rotor shaft 51 and the wire 61. As a result, when the rotor shaft 51 rotates, the wire 61
Also rotates, and when the rotor shaft 51 moves in the longitudinal direction, the wire 61 also moves in the longitudinal direction. This wire 61,
The connecting member 62, one end of the rotor shaft 51, and the nut member 63 are covered with a guide tube 63. The guide tube 63 is formed of an elastic resin. Therefore, the guide tube 63 can be bent together with the guide tube 63 even when the wire 61 is passed through the guide tube 63. The guide tube 63 has an inner diameter of the wire 61.
Is formed to be almost the same as or slightly larger than the outside diameter. For this reason, the wire 61 does not bend relatively to the guide tube 63, and the amount of movement of one end 61a of the wire 61 in the longitudinal direction of the wire 61 is made substantially the same as the amount of movement of the rotor shaft 51. can do.
A lubricant is applied between the inner circumference of the guide tube 63 and the outer circumference of the wire 61. At one end of the guide tube 63, a flange 63a for fixing the guide tube 63 to the fixed cylinder 1a is formed.

The motor body 50 is fixed to the camera body in the motor housing 16 of the fixed barrel 1a by a motor mounting member 71. A guide tube insertion hole 14a penetrating in a direction parallel to the optical axis C is formed in the second wall 14 of the fixed cylinder 1a.
Are formed. One end 63a of the guide tube 63 of the motor 5a is fixed to the second wall 14 through a guide tube insertion hole 14a penetrating in a direction parallel to the optical axis C. For this reason, one end 61a of the wire 61
Is the optical axis C from one end 63a of the guide tube 63.
Project in a direction parallel to One end 61a of the wire 61 is in contact with the wire contact surface 34 of the lens frame 3a. As described above, since the lens frame 3a is urged toward the camera body by the coil spring 6, the lens frame 3a may move in any direction along the optical axis. One end 6 of
1a is always in contact with the lens frame, in other words, the lens frame 3
a and one end 61 a of the wire 61 are connected to be immovable relative to each other in a direction parallel to the optical axis C.

Next, the operation of the lens driving mechanism in this embodiment will be described. When a current flows through the stator 55 of the motor body 50, an electromagnetic force is generated to rotate the rotor 52 around the rotor axis, and the rotor 52 rotates. Since the rotor 52 is attached to the rotor shaft 51 so as not to rotate relatively, when the rotor 52 rotates, the rotor shaft 51 also rotates. Further, since the rotor shaft 51 is screwed to the nut member 53 fixed to the flange 56b, the rotor shaft 51 moves in the direction in which the rotor shaft 51 extends with this rotation. Since the other end 61b of the wire 61 and the one end 51a of the rotor shaft 51 are connected by the connecting tool 62, the wire 61 rotates while the rotor shaft 51 rotates and moves. Move longitudinally. One end of the wire 61 is connected to a guide tube 63.
As a result, since the rotor is guided so as to be parallel to the optical axis C, it moves in a direction parallel to the optical axis C while rotating as the rotor shaft 51 rotates and moves.

As described above, the wire contact surface 34 of the lens frame 3a perpendicular to the optical axis C and the one end 61a of the wire 61 are always in contact with each other. As the lens 61a moves in a direction parallel to the optical axis C, the lens frame 3a also moves in a direction parallel to the optical axis C while being guided by the guide shafts 2, 2,.

As described above, in this embodiment, since the feed screw 59 and the nut member 58 in the prior art are incorporated in the motor 5a, it is necessary to separately prepare the feed screw 59 and the nut member 58. Therefore, the number of parts can be reduced, and it is not necessary to assemble these components with high accuracy, so that the number of assembling steps can be reduced.

Since the lens frame 3a is guided by the guide shaft 2 so as to be movable accurately in a direction parallel to the optical axis C, the driving force on the lens frame 3a produces a component in the direction parallel to the optical axis C. If it acts in the direction including, the lens frame 3a moves accurately in the optical axis direction. For this reason, in this embodiment, one end of the wire 61 for moving the lens frame 3a in the optical axis direction is substantially aligned with the optical axis C by the guide tube 63.
What is necessary is that it is guided in parallel with. Further, the wire 61
Since one end 61a of the lens frame 3 is spherical, the lens frame 3
a of the wire contact surface 34 and one end 61a of the wire 61
Are in point contact with each other, so that it is no longer necessary to make one end of the wire 61 parallel to the optical axis C. Further, the position of one end 61a of the wire 61 in the direction perpendicular to the optical axis C is free as long as it is within the range of contact with the wire contact surface of the lens frame 3a. Further, the position of the motor main body 50 is completely free as long as the wire 61 is within a range where the wire 61 is bent. Therefore, the motor 5a
Without fixing to the fixed cylinder 1a with very high positional accuracy,
The lens frame 3a can be accurately moved in the optical axis direction.

The relationship between the lens frame 3a and one end 61a of the wire 61 is relatively immovable in a direction parallel to the optical axis C, but relatively movable in a direction perpendicular to the optical axis C. Since it is possible, even if the motor 5a is not fixed to the fixed cylinder 1a with high positional accuracy as in the related art,
Unnecessary binding force does not occur. In this embodiment, it is conceivable that one end 61a of the wire 61 whirls. However, even if the one end 61a of the wire 61 whirls, one end 61a of the wire 61 may be swung. Is relatively movable with respect to the lens frame 3a in a direction perpendicular to the optical axis C.
Since one end portion 61a is spherical, unnecessary binding force does not occur.

As described above, in this embodiment, since high mounting accuracy for the motor 5a is not required, it is possible to further reduce the number of assembling steps in combination with the aforementioned reduction in the number of parts.

In this embodiment, if the length of the wire 61 and the amount of bending of the wire 61 are adjusted, the motor body 5
Since the position of 0 is completely free, there is no design restriction on the position of the motor main body 50. Therefore, the distance between the lens frame 3a and the motor main body 50 can be increased, and transmission of heat, vibration, and the like from the motor main body 50 to the lens frame 3a can be attenuated. Further, by placing the motor main body 50 on the camera main body side, the weight of the lens barrel on the subject side is reduced, the moment about the camera main body can be reduced, and the burden required for holding the camera can be reduced. it can.

Next, a lens driving mechanism according to a second embodiment of the present invention will be described with reference to FIG. The lens driving mechanism according to this embodiment is different from the previous embodiment in the engagement relationship between the rotor shaft 51 of the motor 5b and the wire 61, and the other configuration is the same as the previous embodiment.

At one end of the rotor shaft 51 in this embodiment, a hemispherical wire contact portion 51d is formed. The rotor shaft 51 and the wire 61 are connected to a wire contact portion 51d of the rotor shaft 51 and a connecting protrusion 61b of the wire 61.
Is merely in contact with. By the way, as shown in FIG. 1, the lens frame 3a is connected to one end 61 of the wire 61.
The coil spring 6 urged in the direction of contact with the wire a
The other end (connection protrusion) 61b of the first shaft 51 is urged in a direction in which it contacts one end (wire contact portion) 51d of the rotor shaft 51, so that the rotor shaft 51 will move in any direction. The other end 61b of the wire 61 and the one end 51d of the rotor shaft 51 are always in contact with each other. In other words, the other end 61b of the wire 61
And one end 51d of the rotor shaft 51 are connected so as to be relatively immovable in the longitudinal direction.

Accordingly, as in the previous embodiment, the wire 61 also moves with the movement of the rotor shaft 51, and the lens frame 3
a can be moved. However, the other end 61b of the wire 61 and one end 51d of the rotor shaft 51 are
Actually, since the wires 61 are merely in contact with each other, unlike the previous embodiment, the wires 61 move without rotating with respect to the rotation accompanying the movement of the rotor shaft 51. Further, since the other end 61b of the wire 61 and the one end 51d of the rotor shaft 51 are in contact with a flat surface and a spherical surface, they can be bent at this contact surface.

Next, a lens driving mechanism according to a third embodiment of the present invention will be described with reference to FIG. The lens driving mechanism according to this embodiment differs from the first embodiment in the engagement relationship between one end of the wire 61 and the lens frame 3b, and the other configurations are the same as those in the first embodiment. .

The lens frame 3b of this embodiment is provided with a driving force acting portion 33b which protrudes in the outer peripheral direction and to which a driving force from the motor 5a acts. At one end of the wire 61, an engaging member 65 that engages with the driving force acting portion 33b is fixed. The engagement member 65 is a cylindrical middle body 65a.
And disk-shaped flange portions 6 fixed to both ends thereof
5b and 65b. The distance between the two facing flange portions 65b, 65b, that is, the length of the middle body portion 65a is substantially equal to the length of the driving force acting portion 33b in the direction parallel to the optical axis C. The driving operation unit 33b of the lens frame 3b includes:
The engaging member 65 is fitted between the two flange portions 65b, 65b.

Accordingly, one end of the wire 61 and the lens frame 3b cannot move relative to each other in a direction parallel to the optical axis C. As in the first embodiment, the one end of the wire 61 moves with the movement of the wire 61. The lens frame 3b moves in the optical axis direction. Further, since one end of the wire 61 and the lens frame 3b are relatively movable in a direction perpendicular to the optical axis C, the first
As in the first embodiment, unnecessary binding force is not generated unlike the related art.

In this embodiment, the first end of the wire 61 and the lens frame 3b are relatively immovable in the direction parallel to the optical axis C by the engagement member 65, so that the first The coil spring 6 used in the embodiment becomes unnecessary. Since the coil spring 6 acts as a device that resists the thrust of the motor, in this embodiment, the coil spring 6 becomes unnecessary. As a result, the load on the motor can be reduced as compared with the first embodiment, and the size of the motor can be reduced. be able to.

Next, a lens driving mechanism according to a fourth embodiment of the present invention will be described with reference to FIG. In this embodiment, a lens interchangeable camera is provided with a lens driving motor main body on the camera main body side.

In the camera body casing 81, the motor 5a according to the first embodiment is arranged. The camera body 50 is fixed to an inner wall of a camera body casing 81 by a motor mounting tool 71. The wire 61 connected to the rotor shaft of the motor 5a and the guide tube 63 that covers the wire 61 extend from the motor body 50 toward the mount 82 of the camera body 80. Guide tube 63
A flange 63 a formed at one end of the camera body 80 is fixed to a mount 82 of the camera body 80. One end 61 a of the wire 61 projects from the mount 82 of the camera body 80 toward the subject as the motor body 50 is driven.

The mount portion 11 of the fixed barrel 1b is formed with a wire insertion hole 17 so that one end 61a of the camera body side wire 61 can enter the fixed barrel 1b.
In the fixed barrel 1b, a barrel-side wire 66 and a barrel-side guide tube 68 for guiding the position thereof are arranged.
One end 66a of the barrel-side wire 66 is in contact with the wire contact surface 34 of the lens frame 3a, and the other end 66b is
It is in contact with one end 61a of the camera body side wire 61. As in the first embodiment, a hemispherical contact end 61a is formed at one end of the lens barrel side wire 66 in contact with the lens frame 3a. The other end of the lens barrel side wire 66 is connected to one end 6 of the camera body side wire 61.
A disc-shaped wire contact seat 66b is formed to be in contact with 1a. The fixed barrel 1b is provided with a guide frame 18 for guiding the movement direction of the wire contact seat 66b of the lens barrel side wire 66, and a movement limiting plate 19 for limiting the amount of movement of the wire contact seat 66b toward the subject. Have been.

The coil spring 6 for urging the lens frame 3a is
The lens barrel side wire 66 is also urged toward the camera body via the lens frame 3a. Therefore, the lens barrel is connected to the camera body 8.
0, and the camera body side wire 61 enters the fixed barrel 1b, the coil spring 6 connects the other end 66b of the lens barrel side wire 66 to the one end 6 of the camera body side wire 61.
1a, so that the other end 66b of the lens barrel-side wire 66 and the one end 61a of the camera body-side wire 61 are always in contact with each other. Become. Therefore, the camera body casing 8
When the motor main body 50 in 1 is driven and the camera main body side wire 61 moves, the lens barrel side wire 66 moves accordingly, and the lens frame 3a moves in the optical axis direction. In addition,
The other end 66b of the lens barrel side wire 66 and the one end 61a of the camera body side wire 61 are merely in contact with each other. The lens barrel side wire 66 moves without rotating.

In this embodiment, the coil spring 6 is used in order to make the lens barrel side wire 66 and the lens frame 3a relatively immovable in the direction parallel to the optical axis C. The engagement tool 65 described in the embodiment may be used. However, in this case, in order to secure contact between the lens barrel side wire 66 and the camera body side wire 61, the lens barrel side wire 66
It is necessary to take measures such as disposing a coil spring between the wire contact seat 66b and the movement limiting plate 19 of the fixed cylinder 1b.

Although the motor used in each of the above embodiments is a permanent magnet type stepping motor, the present invention is not limited to this. For example, a variable reactance type (VR type) Type (hybrid type)
May be used. The invention is not limited to the stepping motor, and may be a DC motor or an ultrasonic motor, for example, as long as a female screw is formed on the rotor shaft and a nut member screwed to the female screw can be provided. Further, a fluid pressure cylinder in which the output shaft moves in the axial direction, a linear electromagnetic motor in which the operation unit moves linearly, or the like may be used.

[0036]

According to the present invention, there is no need to separately prepare a feed screw or a net member for converting a rotary motion into a linear motion, and the number of parts can be reduced.
Since it is not necessary to assemble these components with high accuracy, the number of assembling steps can be reduced.

Further, the lens frame is guided by the guide means so as to be movable accurately in a direction parallel to the optical axis. If the driving force on the lens frame acts in a direction including a component in a direction parallel to the optical axis. Since the lens frame moves accurately in the optical axis direction, one end of the wire for moving the lens frame in the optical axis direction may be moved substantially parallel to the optical axis. Further, one end of the wire and the lens frame only need to be relatively immovable in a direction parallel to the optical axis. Furthermore, since the wire that transmits the operation of the operation section of the actuator body to the lens frame has flexibility, the position of the actuator body is basically not limited. Therefore, in the present invention, even if the required mounting position accuracy of the actuator having the wire and the actuator main body is reduced, unnecessary binding force is not generated unlike the related art. For this reason, the present invention can further reduce the number of assembling steps together with the reduction in the number of parts.

Further, according to the present invention, the position of the actuator body is not restricted due to the driving of the lens frame, so that the degree of freedom in design can be increased. For this reason,
The distance between the lens frame and the motor body can be easily set, and the transmission of heat, vibration, and the like from the motor body to the lens frame can be attenuated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a lens driving mechanism as a first embodiment according to the present invention.

FIG. 2 is a cross-sectional view of a motor used in a lens driving mechanism according to a first embodiment of the present invention.

FIG. 3 is a perspective view of a rotor of the motor of FIG. 2;

FIG. 4 is a sectional view of a motor used in a lens driving mechanism according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a lens driving mechanism as a third embodiment according to the present invention.

FIG. 6 is a sectional view of a lens driving mechanism according to a fourth embodiment of the present invention.

FIG. 7 is a sectional view of a conventional lens driving mechanism.

[Explanation of symbols]

1, 1a, 1b: fixed cylinder, 2: guide shaft, 3, 3a, 3
b: lens frame, 33, 33b: driving force acting portion, 34: wire contact surface, 4: lens, 5, 5a, 5b: motor, 5
0: motor body, 51: rotor shaft, 52: rotor, 53
... nut member, 55 ... stator, 6 ... coil spring, 61
... wires, camera body side wires, 62 ... connectors, 63 ...
Guide tube, camera body side guide tube, 65 ...
Engagement tool, 66: barrel side wire, 68: barrel side guide tube, 80: camera body, 81: camera body casing.

Claims (5)

[Claims] 1. A lens driving mechanism for moving a lens in the direction of an optical axis, a lens frame for holding the lens, guide means for movably guiding the lens frame in the direction of the optical axis of the lens, and An actuator for moving in the optical axis direction together with the lens frame; wherein the actuator has an actuator body having an operating part that reciprocates in a fixed direction; and has flexibility, and one end is provided with the lens. Touch the frame,
Or directly or indirectly connected to the lens frame in a direction parallel to the optical axis so as not to be relatively movable, and the other end thereof is in contact with the operating unit of the actuator body, or with respect to the operating unit. A wire that is directly or indirectly connected to the fixed direction so as to be relatively immovable, and a guide member that guides the wire so as to be movable on a predetermined path. Lens drive mechanism. 2. The lens drive mechanism according to claim 1, wherein the actuator main body extends in the predetermined direction, and a male screw is formed on a part of an outer periphery thereof; A rotor attached to the rotor shaft so as to be relatively non-rotatable about the rotor shaft and relatively movable in a direction in which the rotor shaft extends, a stator arranged around the rotor and rotating the rotor, A lens drive, comprising: a casing that covers the rotor and the stator; and a nut member fixed to the casing and formed with a female screw into which the male screw of the rotor shaft is screwed. mechanism. 3. The lens driving mechanism according to claim 1, further comprising: urging means for keeping said lens frame in contact with said one end of said wire rod. mechanism. 4. The lens driving mechanism according to claim 1, wherein the guide member is flexible and has a pipe shape in which an insertion hole through which the wire can be inserted is formed. A lens driving mechanism, characterized in that: 5. An actuator having an operating end protruding and retracting, comprising: a rotor shaft extending in a fixed direction and having a male thread formed on a part of an outer periphery; A rotor attached to the rotor shaft so as to be relatively movable in the direction of rotation, a stator arranged on the outer periphery of the rotor and rotating the rotor, a casing covering the rotor and the stator, and fixed to the casing. A nut member formed with a female screw to which the male screw of the rotor shaft is screwed; and a flexible member having one end relatively moved to the end of the rotor shaft in the predetermined direction. And a guide member that guides the wire so as to be movable on a predetermined path, the wire being connected so as to be unable to rotate and the other end forming the operating end. Actuator.