KR20060049349A - Barrel actuating device and lens actuating module and camera module - Google Patents

Abstract

Providing a camera module which can suppress magnetic interference between adjacent stepping motors while securing a space around the barrel, on one surface of the base 32 to which the barrel 12 capable of focusing and zooming is attached, A focus actuator 41 and a zoom actuator 71 for operating the barrel 12 are attached. Each actuator 41 and 71 is provided with stepping motors 42 and 72 and reduction gear trains (transmission mechanisms) 43 and 73 which connect the barrel 12 to this motor. The height of each actuator 41 and 71 is made lower than the height of the barrel 12 which referred to the said one surface. These actuators 41 and 71 are spaced apart in the circumferential direction of the barrel 12 to be deployed along the one surface of the base 32.

Description

Barrel drive device and lens drive module and camera module {BARREL ACTUATING DEVICE AND LENS ACTUATING MODULE AND CAMERA MODULE}

1 is a perspective view illustrating a camera module according to an embodiment of the present invention.

FIG. 2 is a plan view showing the camera module of FIG. 1 with the cover of the casing removed. FIG.

3 is a cross-sectional view illustrating a configuration of a focus actuator of the camera module of FIG. 1.

4 is a cross-sectional view illustrating a configuration of a zoom actuator of the camera module of FIG. 1.

5 is a cross-sectional view showing a relationship between a barrel of the camera module of FIG. 1 and a final gear of each actuator. FIG.

FIG. 6 is a cross-sectional view around the detection unit of the camera module of FIG. 1. FIG.

FIG. 7 is a block diagram showing a configuration of the camera module of FIG. 1. FIG.

FIG. 8 is a perspective view illustrating a configuration of a stepping motor included in each actuator of the camera module of FIG. 1. FIG.

9 is a perspective view showing the attachment state of the barrel 12 of the camera module of FIG.

10 is a cross-sectional view of a state in which the barrel 12 of the camera module of FIG. 1 is attached.

11 is a plan view of a camera module according to another embodiment of the present invention.

FIG. 12 is a view seen from line A-A in FIG. 11; FIG.

FIG. 13 is a view seen from the line B-B in FIG. 11; FIG.

<Explanation of symbols for the main parts of the drawings>

11: camera module 12: barrel

13: barrel drive device 14: circuit block

15 sensor (detector) 16 imaging device

23: focus lens 24: zoom lens

25: Lens driving device for focus 26: Lens driving device for zoom

31 casing 32 base

33: cover 34: barrel passage (barrel arrangement)

35: barrel support plate (barrel arrangement) 41: focus actuator

42: stepping motor 43: reduction gear train (transmission mechanism)

44: coil block 45: yoke

45a: yoke path 45b, 45c: end of yoke

45d: yoke through hole (axial passage) 46: rotor

47: iron core 47a: core portion of the iron core

47b, 47c: yoke connection 48: excitation coil

49: rotor passage hole 51: void

53: drive gear 54: rotating shaft

61: first reduction gear (transmission gear) 62: second reduction gear (transmission gear)

63: third reduction gear (transmission gear) 64: fourth reduction gear (transmission gear)

71: zoom actuator 72: stepping motor

73: reduction gear train (transmission mechanism) 74: coil block

75: York 75a: York part of the ruler

75b, 75c: end of yoke 75d: through hole of yoke (axial passage)

76: rotor 77: iron core

77a: core part of iron core 77b, 77c: yoke connection part

78: excitation coil 79: rotor through hole

81: void 83: drive gear

84: rotation shaft 91: first reduction gear (transmission gear)

92: second reduction gear (transmission gear) 93: third reduction gear (transmission gear)

94: fourth reduction gear (transmission gear) S: space

201: screw hole 202: guide pin hole

203: guide pin 204: screw hole

205: fixing screw 206: fixing screw hole

208: Mirror frame 211: Second fixed lens group

212: first fixed lens group 213: first feed screw shaft

214: second feed screw shaft 215: threaded portion

216: first movable lens holder 217: screw portion

218: Second movable lens holder 219: First movable lens group

220: second movable lens group 221: first guide shaft

222: second guide shaft 223: compression coil spring

224: first shield 225: first detector

226: second shield 227: second detector

228: intermediate gear 229: transmission gear

230: input gear 233: screw

234: coil lead substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrel drive device mounted on a portable electronic device such as a card type digital camera, a mobile phone with a camera, and the like, which is used for focusing or zooming a barrel, and a camera module including the device.

In addition, the present invention is mounted on a portable electronic device such as a card-type digital camera, a mobile phone with a camera, and the like, and is provided with a lens driving module and a lens driving module used for focusing, zooming, and the like of a lens group. It is about a module.

Conventionally, a plurality of actuators for exerting a barrel focusing function, a zooming function, an iris function, and the like are provided, and these actuators are viewed along the two surfaces that form the corners of the camera by looking at the optical axis of the barrel. The lens barrel and the camera of the structure which can be arrange | positioned so that it may be arrange | positioned according to the corner part of a camera so that a plurality of actuators and barrels may be provided so that it may become L shape by planar view (for example, refer patent document 1) ).

Although the structure of each actuator is not mentioned in this patent document 1, since each actuator shown by FIGS. 1-3 of patent document 1 is a cylindrical form, each actuator uses the cylindrical stepping motor generally used as a drive source. It can be judged as And these cylindrical actuators are provided in parallel with the optical axis direction of a barrel, the some actuator therein has substantially the same length as a barrel, and the other actuator protrudes in the optical axis direction rather than the one end surface of a barrel.

<Patent Document 1> Japanese Patent No. 353295 (Paragraph 0012-0017, and FIGS. 1-7)

As described above, in the configuration of Patent Document 1 in which a plurality of cylindrical actuators are provided around the barrel, the length of each cylindrical actuator extending in the optical axis direction of the barrel is in the thickness direction of the lens barrel (barrel drive device). At the same time, some of the actuators protruding from one end surface of the barrel can not increase the thickness of the entire lens barrel (the barrel drive device), so that space around the barrel cannot be secured.

In general, the rotor of the cylindrical stepping motor included in each cylindrical actuator is magnetized to a multipole, and the cylindrical stator that accommodates the rotor inwards has a large number of magnetic poles projecting from the inner circumferential surface toward the rotor. With each of these poles, the excitation coil is wound. The configuration of the cylindrical stepping motor is advantageous in that magnetic shielding is possible with a motor case accommodating a stator or the like. However, since the relationship of disposing the rotor in the cylindrical stator cannot be broken, there is no degree of freedom in the shape of the stepping motor. Accordingly, since there is no degree of freedom in the shape design of the lens barrel (barrel drive device) provided with the cylindrical stepping motor, the lens barrel (barrel drive device) of Reference 1 is suitable for a limited combination space of a thin portable electronic device, for example. It is not morphologically suitable for assembly.

An object of the present invention is to provide a barrel drive device and a camera module which can suppress magnetic interference between adjacent stepping motors while securing a space around the barrel.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the barrel drive apparatus of this invention is a barrel drive apparatus which provided the some actuator which exhibits the several lens function which a barrel has separately, on one surface of a base, and each said actuator is a stepping motor and The motor is provided with a transmission mechanism for interlocking the barrel, and the height of these actuators is formed to be lower than the height of the barrel relative to the one surface, and the respective actuators are disposed around the barrel arrangement where the barrel is disposed. It is spaced apart from each other and deployed to be deployed along one surface of the base.

In the present invention and the following inventions, the plurality of lens functions refer to at least two of, for example, a focusing function for adjusting focus, a zooming function for gradually expanding and reducing an image, and an iris function for adjusting aperture. In the present invention and the following inventions, deploying and arranging each actuator along one surface of the base indicates that at least a part of each actuator is arranged so as not to overlap in the thickness direction thereof. For example, when two actuators are used, It may be provided in the arrangement of a symmetrical shape with this barrel arrangement | positioning part arrange | positioned between, or the case where two actuators are provided in the arrangement | positioning of the rectangular shape centering on the barrel arrangement part in which a barrel is arrange | positioned is also included.

In the present invention, since a plurality of actuators formed to be lower than the height of protrusion of the barrel relative to the base is expanded and spaced along one surface of the base and spaced apart in the circumferential direction of the barrel arranging portion where the barrel is disposed, the thickness of the actuator and the base around the barrel It is possible to secure a space according to the difference in the height of the projecting barrel. At the same time, a plurality of actuators including a stepping motor can be blocked by a barrel, and magnetic interference between the stepping motors of adjacent actuators can be suppressed using the barrel.

Moreover, in order to solve the said subject, the barrel drive apparatus of this invention is equipped with the base, the stepping motor, and the transmission mechanism which connects the barrel which has a focusing function and a zooming function to this motor, and is formed thinner than the said barrel, A focusing actuator provided on one side of the base, a stepping motor, and a transmission mechanism for interlocking the barrel on the motor, which is thinner than the barrel, and has a zoom actuator provided on the one surface, the focusing actuator and the zoom actuator, It is mutually spaced around the barrel arrangement | positioning part in which the said barrel is arrange | positioned, and it deploys along the one surface of the said base.

In the present invention, the focus actuator and the zoom actuator formed to be lower than the height of the barrel projecting relative to the base are deployed along one side of the base and spaced apart from each other around the barrel arranging portion where the barrel is disposed, and thus the focus actuator around the barrel. And a space according to a difference between the thickness of the zoom actuator and the height of protrusion of the barrel to the base. In addition, since the focus actuator including the stepping motor and the zoom actuator are blocked by the barrel, magnetic interference between the stepping motors of adjacent actuators can be suppressed using the barrel.

Moreover, in the preferable aspect of the barrel drive apparatus of this invention, the stepping motor with which the said focus actuator and a zoom actuator are equipped is arrange | positioned in the symmetrical shape across the said barrel arrangement part. In the form of this invention and the following invention, the arrangement of a symmetrical shape is the arrangement which becomes substantially line symmetry with the radial line which can be drawn through the optical axis of a barrel as an origin, or the said optical axis as an origin, Points to an arrangement that is point symmetrical. In this preferred embodiment, the rotor of the focusing actuator and the zooming actuator of the zooming actuator can be separated by more than the diameter of the barrel, so that the magnetic interference between the focusing actuator and the zooming actuator of the stepping motor can be further suppressed. Do.

Moreover, in the preferable form of the barrel drive apparatus of this invention, a barrel passage part is provided in the cover with said each actuator between the said bases. In this preferred embodiment, in mounting the barrel drive device of the present invention to a portable electronic device or the like, when the component is placed in the space around the barrel to increase the density of the component arrangement, the components and actuators arranged in the space are Mechanical interference can be prevented with a cover, and it is preferable to pass a barrel through the barrel passage portion so that a single cover can be used that spans a plurality of actuators.

Moreover, in the preferable aspect of the barrel drive apparatus of this invention, the said stepping motor is a coil block arrange | positioned along the one surface of the said base with the iron core in which the yoke connection part was integrally installed in the end of a core part, and the exciting coil wound around the said core part, A part of a path other than the end connected to the yoke connecting portion is provided so as not to overlap the coil block, and the path includes a yoke having a rotor passage hole and a rotor disposed in the rotor passage hole.

In the stepping motor according to this preferred embodiment, the excitation coil generating the magnetic flux by excitation and the rotor passage hole in which the rotor is disposed are shifted along one surface of the base, and the magnetic flux generated by the application (excitation) of the driving pulse passes through the rotor into the rotor. Guide the ball to rotate the rotor. The stepping motor is not a cylindrical shape but has a coil block having an excitation coil arranged along a base, a yoke provided with a portion other than the end connected to the block so that the portion does not overlap the coil block, and the yoke has a rotor through hole. By providing the arranged rotor, it can form in flat shape. As a result, although the rotor axis is parallel to the optical axis of the barrel, the actuator is thinner than the actuator used by arranging the cylindrical stepping motor in the direction of the optical axis of the barrel, so the space around the barrel is suitable for securing a space around the barrel. It is preferable at the point.

Moreover, in the preferable form of the barrel drive apparatus of this invention, the said rotor and the said transmission mechanism are arrange | positioned with respect to the said coil block along the said one surface. In this preferred embodiment, it is possible to arrange the rotor and the transmission mechanism between the coil block and the barrel, and in this case, it is preferable in that the amount of yoke is small and the entire barrel drive device can be made lightweight.

Moreover, in the preferable form of the barrel drive apparatus of this invention, the said transmission mechanism consists of a reduction gear train, and the gear shaft of this gear train is arrange | positioned in the projection area of the said stepping motor. Moreover, in the preferable form of the barrel drive apparatus of this invention, the said passage part has the shaft passage part which consists of a passage hole or notch, and this gear passage part makes the said gear shaft pass. Moreover, in the preferable form of the barrel drive apparatus of this invention, the space | gap is formed between the said magnetic path part and the said coil block, and the said gear shaft is made to pass through this space | gap.

According to these aspects, since at least a part of the gears fixed to the gear shaft arranged in the projection area are arranged overlapping with the stepping motor, the gear installation space required between the stepping motor and the barrel can be reduced, It is possible to make the barrel drive device small.

Moreover, in order to solve the said subject, the camera module of this invention is a camera module which provided the some actuator which exhibits the several lens function which a barrel has on the one surface of a base separately, Each said actuator is a stepping motor and this In addition to the transmission mechanism for communicating the barrel to the motor, the height of these actuators is formed to be lower than the height of the barrel relative to the one surface, and the actuators are separated in the circumferential direction of the barrel to provide I deploy and arrange along one side.

In the present invention, since a plurality of actuators formed to be lower than the height of projecting of the barrel relative to the base is deployed along one side of the base and spaced apart in the circumferential direction of the barrel, the thickness of the actuator and projecting of the barrel relative to the base around the barrel. The space according to the difference with the height can be secured. In addition, a plurality of actuators having a stepping motor are blocked by the barrel, and magnetic interference between the stepping motors of adjacent actuators can be suppressed using the barrel.

In addition, in order to solve the above problems, the camera module of the present invention has a base, a barrel having a focusing function and a zooming function, a stepping motor and a transmission mechanism for linking the barrel to the motor, and is formed thinner than the barrel. And a focus actuator provided on one surface of the base, a stepping motor, and a transmission mechanism for interlocking the barrel to the motor, wherein the focus actuator is formed thinner than the barrel, and includes a zoom actuator provided on the one surface, and the focus actuator and the zoom actuator. Is spaced apart in the circumferential direction of the barrel to be deployed along one surface of the base.

In the present invention, since the focus actuator and the zoom actuator formed to be lower than the height of the barrel protruding from the barrel are developed and spaced apart along the one surface of the base and separated in the circumferential direction of the barrel, the thickness of the focus actuator and the zoom actuator around the barrel is The space according to the difference with the height of protrusion of the barrel to the base can be secured. In addition, since the focus actuator including the stepping motor and the zoom actuator are blocked by the barrel, magnetic interference between the stepping motors of adjacent actuators can be suppressed using the barrel.

Moreover, in the preferable aspect of the camera module of this invention, the stepping motor with which the said focus actuator and the zoom actuator are equipped is arrange | positioned in the symmetrical shape across the said barrel. In this preferred embodiment, the rotors of the focus actuator and the stepping motor of the zoom actuator are separated by more than the diameter of the barrel, and are preferable in that magnetic interference between the stepping motors of the focus actuator and the zoom actuator can be further suppressed. .

Moreover, in the preferable aspect of the camera module of this invention, the barrel passage part is formed in the cover with said each actuator between the said bases. In this preferred embodiment, in mounting the camera module of the present invention to a portable electronic device or the like, when the component is placed in a space around the barrel to increase the density of the component arrangement, the component disposed in the space and the actuator Mechanical interference can be prevented with a cover, and it is preferable to pass a barrel through the barrel passage portion, so that a single cover that spans a plurality of actuators can be used.

Moreover, in the preferable aspect of the camera module of this invention, the said stepping motor is the coil block arrange | positioned along one surface of the said base with the iron core and yoke coil wound around the said core part integrally provided with the yoke connection part in the core part, the said A part of a path other than the end connected to the yoke connecting portion is provided so as not to overlap the coil block, and the path includes a yoke having a rotor passage hole and a rotor disposed in the rotor passage hole.

In the stepping motor of this preferred embodiment, the magnetic coil generated by the excitation and the rotor through-hole in which the rotor is disposed are shifted along one surface of the base, and the magnetic flux generated by the application (excitation) of the driving pulse is changed into the yoke. Guide the rotor through the hole and rotate the rotor. The stepping motor is not a cylindrical shape but has a coil block having an excitation coil arranged along a base, a yoke provided with a portion other than the end connected to the block so that the portion does not overlap the coil block, and the yoke has a rotor through hole. By providing the arranged rotor, it can form in flat shape. Accordingly, although the rotor axis is parallel to the optical axis of the barrel, the actuator is thinner than the actuator used by arranging the cylindrical stepping motor along the optical axis direction of the barrel, so that the space around the barrel is adequate for securing the space around the barrel. It is preferable at the point.

Moreover, in the preferable aspect of the camera module of this invention, the said rotor and the said transmission mechanism are arrange | positioned between the said coil block and the said barrel. This preferable aspect is preferable in that the amount of yoke used is small and the whole camera module can be made light in weight.

Moreover, in the preferable aspect of the camera module of this invention, the said transmission mechanism consists of a reduction gear train, and the gear shaft of this gear train is arrange | positioned in the projection area | region of the said stepping motor. Moreover, in the preferable aspect of the camera module of this invention, the said gyro part has the shaft passage part which consists of a passage hole or notch, and this gear passage part makes the said gear shaft pass. Moreover, in the preferable aspect of the camera module of this invention, a space | gap is formed between the said magnetic path part and the said coil block, and the said gear shaft is made to pass through this space | gap.

According to these aspects, since at least a part of the gears fixed to the gear shaft arranged in the projection area are arranged overlapping with the stepping motor, the gear installation space required between the stepping motor and the barrel can be reduced. It is possible to miniaturize the camera module.

In a preferred embodiment of the barrel drive device of the present invention, a plurality of fixing screw through-holes are formed at the rear end of the barrel, and guide pins for fitting the sensor substrate are provided. By inserting a set screw from the sensor board side and penetrating the set screw through hole in the state where the board is inserted into the guide pin, the sensor board and the barrel are tightened together and fixed to the unit body.

In this embodiment, it is not necessary to provide the fixing part in the barrel on the rotating side, so that the entire module can be prevented from being enlarged.

Moreover, the preferable aspect of the camera module of this invention is characterized by including the imaging element in the barrel drive apparatus.

The lens drive module of the present invention for solving the above problems comprises at least two groups of lenses, at least one stepping motor formed in a width narrower than the movable range of the lens group, and at least one group of lens groups in the optical axis direction. A feed screw shaft for reciprocating and a gear train for transmitting the output of the stepping motor to the feed screw shaft.

In a preferred embodiment of the lens drive module of the present invention, the stepping motor includes a core block having an iron core and an excitation coil wound around the core portion integrally provided at the end of the core portion, and a coil block disposed along one surface of the base, and a gyro portion. A yoke having a rotor through hole and a rotor disposed in the rotor through hole to form an output portion.

Moreover, the preferable aspect of the lens drive module of this invention is a position detection means which detects the position of a lens group, rotation control means which only permits reciprocating movement of a lens group, and elastically pressurizes a lens group to one direction of an optical axis direction. Elastic pressing means was provided.

According to these aspects, the actuator formed lower than the height of the movement range of the lens group with respect to the base is provided along the one surface of the base and provided around the lens group, and has a feed screw shaft for reciprocating the lens group in the optical axis direction. Therefore, the space according to the difference between the thickness of the actuator and the height of the movement range of the lens group with respect to the base can be secured around the movement range of the lens group, and the space in the radial direction of the lens group can be secured. have.

A preferable embodiment of the camera module of the present invention is characterized in that the lens driving module described above is provided with an imaging element.

An embodiment of the present invention will be described with reference to FIGS. 1 to 8.

Reference numeral 11 in FIGS. 1 and 7 denotes a camera module. The camera module 11 is mounted on a printed wiring board in a body of a thin portable electronic device such as a card type digital camera or a mobile phone with a camera, for example. The camera module 11 includes a barrel 12, a barrel drive device 13, a circuit block 14, a sensor 15 constituting a detection unit, and an imaging device 16.

The barrel 12 incorporates the focus lens 23 and the zoom lens 24 shown in FIG. 7 in the outer cylinder 22 supporting the fixed lens 21 shown in FIGS. 1 and 2, respectively. And lens driving devices 25 and 26 shown in FIG. One lens driving device 25 has a first lens function, for example, a focusing function together with the focus lens 23, and has a focus ring 25a rotatable by a predetermined angle of the barrel 12 (see FIGS. 3 and 5). Has) An engaging gear 25b (see FIG. 2) is formed in the focus ring 25a that extends in the circumferential direction over a predetermined range of its outer circumference. The rotation of the focus ring 25a causes the focus lens 23 to move in the optical axis direction of the barrel 12 to perform focusing (focusing operation).

The other lens driving mechanism 26 is in charge of the second lens function, for example, the zooming function together with the zoom lens 24, and rotates the zoom ring 26a at a predetermined angle of the barrel 12 (FIGS. 4 and FIG. 4). 5). The zoom ring 26a is formed with an engagement gear 26b (see FIG. 2) extending in the circumferential direction over a predetermined range of its outer circumference. The zoom lens 24 is moved in the optical axis direction of the barrel 12 by the rotation of the zoom ring 26a, and zooming is performed. The engagement gears 25b and 26b protrude from an end portion on the opposite side to one end of the outer cylinder 22 to which the fixed lens 21 is fixed.

As shown in FIG. 2 and the like, the barrel drive device 13 is formed by housing a focus actuator 41 for driving the barrel 12 and a zoom actuator 71 in the casing 31.

As shown in FIG. 1, the casing 31 is formed into a rectangular parallelepiped shape (including a cubic shape) by connecting the base 32 and the cover 33, and, for example, in the central portion of the cover 33. A barrel passage portion 34 formed of a circular passage hole is provided. Since the barrel drive device 13 including the rectangular parallelepiped casing 31 can be used for positioning the side surface of the casing 31 when positioning the camera module 11 at a predetermined position. great.

The barrel 12 which passes through the barrel passage part 34 and the most part protruded out of the casing 31 has the outer cylinder 22 of the barrel passage part 34 as shown to FIGS. It is fixed to the casing 31 by being supported by the edge part and being fixed to the base 32 with the screw 36 (refer FIG. 2). Therefore, the barrel support part 35 which formed the ring shape of the barrel passage part 34 and the base 32, and these peripheries are used as a barrel arrangement part. The barrel support part 35 which forms a part of the base 32 is fixed to the base 32 with the barrel 12.

The focus actuator 41 and the zoom actuator 71 formed thinner than the barrel 12 by the configuration described below are spaced apart in the circumferential direction of the barrel 12 as shown in FIG. 2 (the cover of the base 32). And (33) facing each other), and in this embodiment, they are arranged in a symmetrical shape with the barrel 12 interposed therebetween as a preferred example. Space based on the difference of the thickness and the height of the barrel 12 around the barrel 12 which protruded higher than the thickness (height) of the focus actuator 41 and the zoom actuator 71 with respect to the base 32. (S) (refer FIG. 1) is formed.

2 and 3, the focus actuator 41 is formed with a stepping motor 42 and a transmission mechanism, for example, a reduction gear train 43, and at the same time the base 32 and the cover ( 33) are provided between them using gear support, respectively.

As shown in FIG. 2, FIG. 3, and FIG. 8, the stepping motor 42 is a 2-pole motor with a 180 degree step angle, for example, the coil block 44, the yoke 45, and the rotor ( 46). The coil block 44 and the yoke 45 form a stator.

The coil block 44 has an iron core 47 and an exciting coil 48. The iron core 47 is formed by integrally installing yoke connecting portions 47b and 47c at both ends in the longitudinal direction of the core portion 47a, respectively. As a preferable example, a pair of coil block 44 is provided so that the rotational speed at the time of forward rotation and the reverse rotation of the rotor 46 becomes equal. In particular, in this embodiment, since the yoke connection part 47c is shared in order to integrate these coil blocks 44, the yoke connection part 47b is provided in the both sides of this connection part 47c via the core part 47a, respectively. do. The exciting coil 48 is wound around the core part 47a, respectively.

The yoke 45 for guiding the magnetic flux generated by the excitation of the excitation coil 48 has a flat plate shape and has end portions 45b and 45c connected to the yoke connecting portions 47b and 47c. The pair of ends 45b are respectively connected to the yoke connector 47b, and the other end 45c positioned between the pair of ends 45b is connected to the yoke connector 47c. The magnetic path part 45a except the edge parts 45b and 45c of the yoke 45 does not overlap with the coil block 44 but protrudes to the side of the coil block 44. The rotor passage hole 49 is formed in this magnetic path part 45a.

A gap 51 is formed between the magnetic path portion 45a and the coil block 44. At least a portion of the side of the excitation coil 48 faces the gap 51. In FIG.2 and FIG.8, the code | symbol 52 shows the recessed part of the gyro part 45a provided around the rotor passage hole 49. As shown in FIG. Both the concave portion 52 and the rotor passage hole 49 and the gap 51 and the rotor passage hole 49 are both self-saturated with very small cross-sectional area and are very easily self-saturated. For this reason, the inner circumferential surface of the rotor passage hole 49 is substantially divided into portions having a very small cross section. Each of these divided regions functions as a magnetic pole stage, so that an S pole or an N pole appears at the pole stage whenever a driving pulse is applied to the excitation coil 48.

The rotor 46 is disposed in the rotor passage hole 49. The outer circumferential portion of the rotor 46 is magnetized to different polarities for each of predetermined regions adjacent to the circumferential direction. Therefore, whenever the driving pulse is applied to the excitation coil 48 via the motor driver 102 (see FIG. 7) described later, the stepping motor 42 is provided between the magnetic pole and the magnetic pole of the rotor 46. It rotates at a step angle of 180 ° by the magnetic action of. The drive gear 53 is connected or integrally formed in the rotor 46. Both ends of the rotating shaft 54 of the rotor 46 are rotatably supported by the base 32 and the cover 33.

This stepping motor 42 is arrange | positioned along the edge of the base 32. As shown in FIG. Specifically, as shown in FIG. 2, the coil block 44 is disposed along the one end 32a in the longitudinal direction of the base 32. The stepping motor 42 arranged in this way is fixed to the base 32 via the screw 55 shown in FIG. In this case, the screw 55 is screwed through the yoke connecting portion 47b and the end portion 45b of the yoke 45 connected thereto. The yoke 45 of the fixed stepping motor 42 is along one surface of the base 32. The optical axis of the barrel 12 is parallel to the axis of the rotor 46 of the stepping motor 42 disposed as described above on one side of the barrel 12.

Reference numeral 58 in Figs. 2 and 6 denotes an origin projection for focus integrally provided on the outer circumferential surface of the focusing ring 25a. The sensor 15 is attached to a part of the outer circumferential side of the barrel support plate 35. A photo interrupter or the like for detecting the origin projection 58 is used for this sensor 15. The sensor 15 and the origin projection 58 constitute an origin detection means for detecting the origin position which is a reference for this operation every time the focusing operation, and the focusing operation is performed based on the detected origin.

The focus lens driver 25 and the barrel 12 are connected via a reduction gear train 43 arranged on one surface of the base 32. As shown in FIG. 2 and FIG. 3, the reduction gear train 43 has a plurality of, for example, first to fourth reduction gears (transmission gears) 61 to 64 made of flat gears.

The first reduction gear 61 has a larger diameter than the drive gear 53 of the rotor 46 and has a smaller diameter than the transmission gear 61a meshed with the drive gear 53 and the transmission gear 61a. It has a transmission gear 61b which rotates integrally with the transmission gear 61a. The gear shaft of this 1st reduction gear 61 is supported by the base 32 and the cover 33 so that both ends may rotate freely. The second reduction gear 62 has a transmission gear 62a meshed with the transmission gear 61b with a diameter larger than that of the transmission gear 61b, and a transmission gear 62a with a diameter smaller than the transmission gear 62a. It has a transmission gear 62b which rotates integrally. The gear shaft of the second reduction gear 62 is rotatably supported by the base 32 and the cover 33 at both ends.

The third reduction gear 63 has a transmission gear 63a meshed with the transmission gear 62b with a diameter larger than that of the transmission gear 62b, and a transmission gear 63a with a diameter smaller than the transmission gear 63a. It has a transmission gear 63b which rotates integrally. The gear shaft of this third reduction gear 63 is rotatably supported by the base 32 and the cover 33 at both ends. The fourth reduction gear 64 is engaged with the transmission gear 63b with a diameter larger than that of the transmission gear 63b, and the gear shaft is rotatably supported by the base 32 and the cover 33 at both ends. This final fourth reduction gear 64 is used as a focus ring drive vehicle and is engaged with the engagement gear 25b of the focus ring 25a. Therefore, when the stepping motor 42 is driven and the rotor 46 is rotated forward or reversely, the rotation is decelerated by the reduction gear train 43 and given to the lens drive mechanism 25.

Most of the rotor 46 and the reduction gear train 43 are shifted along the one surface of the base 32 with respect to the coil block 44, and are disposed between the coil block 44 and the barrel 12. have. As a result, since the magnetic path portion 45a of the yoke 45 is disposed in a shape corresponding to the space between the coil block 44 and the barrel 12, the amount of the magnetic material forming the yoke 45 is small and light. In addition, the cost can be reduced.

A part of the reduction gear train 43, specifically, the first reduction gear 61 and the second reduction gear 62 are disposed in the projection area of the stepping motor 42. In order to realize this arrangement, an example of the shaft passage portion in which the gear shaft of the first reduction gear 61 passes through the cavity 51 and the gear shaft of the second reduction gear 62 is provided in the yoke 45 is shown. For example, it passes through the passage hole 45d. It is also possible to form the shaft passage portion by notching instead of the passage hole 45d. Since the speed reduction gear train 43 is arrange | positioned on the stepping motor 42 by overlapping by this, the gear installation space required between the stepping motor 42 and the barrel 12 can be reduced, and the barrel drive is by that much. It is possible to make the device 13 compact.

2 and 4, the zoom actuator 71 is formed with a stepping motor 72 and a transmission mechanism, for example, a reduction gear train 73, and the base 32 and the cover 33. ) Are respectively supported and used to arrange them. As the stepping motor 72 of the zoom actuator 71, at least the same motor as the stepping motor 42 of the focus actuator 41 is used, so that the parts can be shared. In addition, in the case of this embodiment, the reduction gear train 73 also uses the same gear train as the reduction gear train 43 of the focus actuator 41, and components common use is achieved.

In detail, as shown in FIG.2 and FIG.4, the stepping motor 72 is a 2-pole motor with a 180 degree step angle, for example, the coil block 74, the yoke 75, and the rotor. 76 is provided. The coil block 74 and the yoke 75 form a stator.

The coil block 74 has an iron core 77 and an exciting coil 78. The iron core 77 is integrally provided with yoke connecting portions 77b and 77c at both ends in the longitudinal direction of the core portion 77a, respectively. As a preferable example, a pair of coil block 74 is provided so that the rotational speed at the time of forward rotation and the reverse rotation of the rotor 76 becomes the same. In particular, in this embodiment, since the yoke connection part 77c is shared in order to integrate these coil blocks 74, the yoke connection part 77b is provided in the both sides of this connection part 77c via the core part 77a, respectively. do. The exciting coil 78 is wound around the core 77a, respectively.

The yoke 75 which guides the magnetic flux generated by the excitation of the excitation coil 78 has a flat plate shape and has end portions 75b and 75c connected to the yoke connecting portions 77b and 77c. The pair of ends 75b are respectively connected to the yoke connection 77b, and the other end 75c positioned between the pair of the ends 75b is connected to the yoke connection 77c. The magnetic path portions 75a except for the end portions 75b and 75c of the yoke 75 do not overlap the coil block 74, but protrude to the side of the coil block 74. The rotor passage hole 79 is formed in this magnetic path part 75a.

A space 81 is formed between the magnetic path portion 75a and the coil block 74. At least a portion of the side of the excitation coil 78 faces the gap 81. In FIG.2 and FIG.8, the code | symbol 82 has shown the recessed part of the gyro part 75a formed around the rotor passage hole 79. As shown in FIG. Both the concave portion 82 and the rotor passage hole 79, and the space 81 and the rotor passage hole 79 all have very small cross-sectional areas and self saturate very easily. For this reason, the inner circumferential surface of the rotor passage hole 79 is substantially divided into portions having a very small cross section. Each of these divided regions functions as a magnetic pole stage, and an S pole or an N pole appears at the magnetic pole stage whenever a driving pulse is applied to the excitation coil 78.

The rotor 76 is disposed in the rotor through hole 79. The outer circumferential portion of the rotor 76 is magnetized with different polarities for every predetermined region adjacent to the circumferential direction. Therefore, whenever the driving pulse is applied to the excitation coil 78 via the motor driver 103 (see FIG. 7) described later, the stepping motor 72 is connected between the magnetic pole and the magnetic pole of the rotor 76. It rotates at a step angle of 180 ° by the magnetic action of. The drive gear 83 is connected or integrally formed in the rotor 76. Both ends of the rotating shaft 84 of the rotor 76 are rotatably supported by the base 32 and the cover 33.

This stepping motor 72 is arrange | positioned along the edge of the base 32. As shown in FIG. Specifically, as shown in FIG. 2, the coil block 74 is disposed along the other end edge 32b in the longitudinal direction of the base 32. The stepping motor 72 arranged in this way is fixed to the base 32 via the screw 85 shown in FIG. In this case, the screw 85 is screwed through the yoke connecting portion 77b and the end 75b of the yoke 75 connected thereto. The yoke 75 of the fixed stepping motor 72 is along one surface of the base 32. It is parallel to the optical axis of the barrel 12 and the axis line of the rotor 76 of the stepping motor 72 arranged as described above on the opposite side to the lens drive mechanism 25 with the barrel 12 interposed therebetween.

The lens driving device 26 for zooming and the barrel 12 are connected via a reduction gear train 73 disposed on one surface of the base 32. As shown in FIG. 2 and FIG. 4, the reduction gear train 73 has a plurality of spur gears, for example, first to fourth reduction gears (transmission gears) 91 to 94.

The first reduction gear 91 has a diameter larger than that of the drive gear 83 of the rotor 76 and has a diameter smaller than that of the transmission gear 91a meshed with the drive gear 83 and the transmission gear 91a. It has a transmission gear 91b which rotates integrally with the transmission gear 91a. The gear shaft of this first reduction gear 91 is rotatably supported by the base 32 and the cover 33 at both ends. The second reduction gear 92 has a transmission gear 92a meshed with the transmission gear 91b with a diameter larger than that of the transmission gear 91b, and a transmission gear 92a with a diameter smaller than the transmission gear 92a. It has the transmission gear 92b which rotates integrally. The gear shaft of the second reduction gear 92 is supported by the base 32 and the cover 33 so as to be rotatable at both ends.

The third reduction gear 93 has a transmission gear 93a meshed with the transmission gear 92b with a diameter larger than that of the transmission gear 92b and the transmission gear 93a with a diameter smaller than the transmission gear 93a. And a transmission gear 93b which rotates integrally with the. The gear shaft of the third reduction gear 93 is rotatably supported at both ends by the base 32 and the cover 33. The fourth reduction gear 94 is engaged with the transmission gear 93b with a diameter larger than that of the transmission gear 93b, and the gear shaft is rotatably supported by the base 32 and the cover 33 at both ends. This final fourth reduction gear 94 is used as a zoom ring drive car and is engaged with the engagement gear 26b of the zoom ring 26a. Therefore, when the stepping motor 72 is driven and the rotor 76 is rotated forward or reversely, the rotation is decelerated by the reduction gear train 73 and is given to the lens driving device 26.

Most of the rotor 76 and the reduction gear train 73 are shifted along one surface of the base 32 with respect to the coil block 74, and are disposed between the coil block 74 and the barrel 12. have. As a result, the magnetic path portion 75a of the yoke 75 is disposed in a shape corresponding to the space between the coil block 74 and the barrel 12, so that the amount of magnetic material forming the yoke 75 is small. The weight can be reduced and the cost can be reduced.

A part of the reduction gear train 73, specifically, the first reduction gear 91 and the second reduction gear 92 are disposed in the projection area of the stepping motor 72. In order to realize this arrangement, an example of the shaft passage portion in which the gear shaft of the first reduction gear 91 passes through the cavity 81 and the gear shaft of the second reduction gear 92 is provided in the yoke 75 is shown. For example, it passes through the pass hole 75d. It is also possible to form the shaft passage portion by notching instead of the passage hole 75d. Since the reduction gear train 73 is arrange | positioned on the stepping motor 72 by this, the gear installation space required between the stepping motor 72 and the barrel 12 can be reduced, and the barrel drive device by that much It is possible to make (13) small.

As described above, the focus actuator 41 in which the coil block 44 is aligned with one edge 32a in the longitudinal direction of the base 32 and the other end of the coil block 74 in the longitudinal direction of the base 32 are provided. The zoom actuators 71 provided in accordance with the edges 32b are spaced apart from each other in the circumferential direction of the barrel 12 and are deployed and disposed along one surface of the base 32. In detail, as shown in FIG. It arrange | positions in symmetrical shape with the straight line which passes through the optical axis of the barrel 12 as a reference line across (12).

As shown in FIG. 7, the circuit block 14 includes a control unit 101, motor drivers 102 and 103, a signal processing unit 104, and the like. The control unit 101 has a CPU, a memory, and the like, and is responsible for controlling the overall barrel drive device 13 of the camera module 11 including controlling the operation of the imaging element 16. When the motor driver 102 drives the focus actuator 41, the motor driver 102 applies the required number of driving pulses to the stepping motor 42. Similarly, the motor driver 103 drives the zoom actuator 71. In this case, the required number of drive pulses is applied to the stepping motor 72. The signal processing unit 104 processes the image pickup signal output from the pin-shaped element 16 and supplies it to the control unit 101. As the imaging element 16, a semiconductor device such as a CCD or a CMOS is used. In addition, in FIG. 7, reference numeral 105 denotes a display portion made of an LCD or the like. The display section 105 is provided in a portable electronic device in which the camera module 11 is combined, and displays image information captured by the imaging element 16, memory information of the memory, and the like.

Reference numeral 106 in Figs. 3 to 5 shows a flexible printed wiring board. In this flexible printed wiring board 106, a control unit 101 and a signal processing unit 104 are provided, and motor drivers 102 and 103 and an imaging device 16 are mounted. The intermediate portion of the flexible printed wiring board 106 is adhesively fixed to the rear surface of the barrel support plate 35. Thereby, the wiring board part located inside the barrel support plate 35 is supported so that it may not be shaken, and the imaging element 16 is mounted and mounted on the optical axis of the barrel 12 in this part. 3 and 4, reference numerals 107 and 108 denote the electrical connection of the motor connection ends 106a and 106b having electrical contacts of the flexible printed wiring board 106 to the stepping motors 42 and 72 electrically. Indicates the attachment screw.

As described above, the stepping motors 42 and 72 used in the barrel drive device 13 included in the camera module 11 are not cylindrical but have excitation coils 48 and 78 arranged along one surface of the base 32. Coil blocks 44 and 74 having magnetic pole portions 45a and 75a other than the end portions 45b and 45c or 75b and 75c connected to the coil blocks 44 and 74, respectively. Since the yoke 45 and 75 provided along the base 32 and the rotor 46 and 76 arrange | positioned in the rotor through-holes 49 and 79 of the yoke 45 and 75 do not overlap, it is flat Can be configured. For this reason, the stepping motors 42 and 72 do not become an element which increases the thickness of the barrel drive device 13 of the camera module 11. In addition, since the female coils 48 and 78 of the stepping motors 42 and 72 are provided with their main surfaces horizontally along the base 32, in order to increase the magnetic flux, the core portions of the exciting coils 48 and 78 are increased. Even if the winding length for 47a and 77a is increased, this is not a factor for increasing the thickness of the stepping motors 42 and 72, and furthermore, the thickness of the barrel drive device 13.

In addition, the stepping motors 42 and 72 and the barrel 12 driven through the reduction gear trains 43 and 73 driven by the power of these motors 42 and 72 are provided on one surface of the base 32. The speed reduction gear trains 43 and 73 for interlocking the rotors 46 and 76 and the lens driving devices 25 and 26 are provided at the same time along the longitudinal direction of the base 32. It is a planar arrangement provided between the 42 and 72 and the barrel 12.

Therefore, in spite of the parallel axis of the optical axis of the barrel 12 and the axis of the rotors 46 and 76, the barrel drive device 13 is compared with the barrel drive device which used the cylindrical stepping motor vertically so that the axis might be parallel with the optical axis. ) The overall thickness can be reduced. In other words, the thickness of the focus actuator 41 and the zoom actuator 71 for driving the barrel 12 can be made much thinner than the height of the barrel 12 relative to the base 32. Then, the focus actuator 41 and the zoom actuator 71 formed in such a flat manner are arranged in a symmetrical shape with the barrel 12 interposed therebetween as a preferable example, so that the base actuator 32 is spaced apart in the circumferential direction of the barrel 12. I deploy it along one side of the).

For this reason, the space S according to the difference between the thickness of the focus actuator 41 and the zoom actuator 71 and the protrusion height of the barrel 12 with respect to the base 32 can be secured around the barrel 12. (See FIG. 1). As a result, in the portable electronic device on which the camera module 11 is mounted, the component is arranged in the space around the barrel 12 to increase the density of the component arrangement and contribute to further miniaturization of the portable electronic device. In this case, the mechanical interference between the component disposed in the space S, the focus actuator 41 and the zoom actuator 71 can be prevented by the cover 33. In addition, since the cover 33 has a barrel passage portion 34 through which the barrel 12 passes, it is not necessary to prepare a cover for each of the focus actuator 41 and the zoom actuator 71, and the single cover 33 is provided. Can be used.

In addition, as described above, the focus actuator 41 and the zoom actuator 71 have no special magnetic shielding measures for these yokes 45 and 75 in order to reduce the thickness thereof. Nevertheless, the focus actuator 41 and the zoom actuator 71 are blocked by the barrel 12 by more than the diameter of the barrel 12 as a preferred example, and thus the focus actuator 41 and the zoom actuator 71. Magnetic interference between the rotors 46 and 76 of the stepping motors 42 and 72 and the stepping motors 42 and 72 of the focus actuator 41 or the zoom actuator 71 adjacent thereto can be suppressed. As a result, when the operation timings of the focus actuator 41 and the zoom actuator 71 overlap, there is no fear of generating a driving obstacle due to the influence of the magnetic interference, and the driving of the actuator can be stabilized.

Moreover, the stepping motors 42 and 72 base the excitation coils 48 and 78 which generate | occur | produce magnetic flux by applying a drive pulse to it, and the rotor through-holes 49 and 79 in which the rotors 46 and 76 are arrange | positioned. Comprising on one side of (32), and guides the generated magnetic flux from the gyro portion (45a, 75a) of the yoke (45, 75) to the rotor passage hole (49, 79) to rotate the rotor (46, 76) Since it is a structure, there is no restriction | limiting in particular in the positional relationship of the exciting coil 48, 78 and the rotor 46, 76. As shown in FIG.

For this reason, even if the coil blocks 44 and 74 are arrange | positioned arbitrarily with respect to the rotor 46 and 76, it can function as a motor, and there is no restriction in the arrangement | positioning of the rotor 46 and 76 and the excitation coils 48 and 78. . Therefore, when arranging the coil blocks 44 and 74 to the arbitrary edges of the base 32, the casing 31 which has the base 32 in the shape according to the arrangement | positioning of the exciting coils 48 and 78 is carried out. It is possible to obtain a degree of freedom in designing the shape of the barrel drive device 13, which can change the shape of.

In addition, the barrel drive device 13 of the above configuration transmits rotation from the rotors 46 and 76 of the stepping motors 42 and 72 to the lens drive devices 25 and 26 for driving the barrel 12. As described above, reduction gear trains 43 and 73 made of spur gears are used. Since these reduction gear trains 43 and 73 do not obtain a large reduction ratio at the first stage like worm gears, there is little power loss due to sliding friction, and power consumption of the stepping motors 42 and 72 accompanying them is also small. can do.

The situation in which the barrel 12 is affixed based on FIG. 9, FIG. 10 is demonstrated. FIG. 9 is a perspective view illustrating a state in which the barrel 12 is attached, and FIG. 10 is a cross section of the state in which the barrel 12 is attached.

As shown in the figure, the barrel 12 is inserted into the casing 31 as the unit body from the front end side (lower side in the drawing) and fixed to the casing 31 together with the circuit block 14 as the sensor substrate. That is, at the rear end of the barrel 12 (upper side of the drawing), a mirror frame 208 for supporting the rotating portion is provided, and the mirror frame 208 is formed with three screw hole portions 201 which are fixed screw through holes. have. The rear end surface of the mirror frame 208 is provided with a guide pin 203 into which the guide pin hole 202 of the circuit block 14 is fitted, and the circuit block 14 corresponds to the position of the screw hole 201. Three screw holes 204 are formed. The casing 31 is formed with a fixing screw hole 206 to which the fixing screw 205 is tightened. In addition, in the figure, 16 is an imaging element, 21 is a fixed lens, 23 is a focusing lens, and 24 is a zoom lens.

Accordingly, the barrel 12 is inserted into the casing 31 on the front end side, and the guide pin hole 202 of the circuit block 14 is inserted into the guide pin 203 of the mirror frame 208 to be connected to the barrel 12. The circuit block 14 is positioned and integrated. The fixing screw 205 is inserted from the screw hole 204 side of the circuit block 14, and the fixing screw 205 is tightened to the fixing screw hole 206 by passing through the screw hole 201. Accordingly, the circuit block 14 and the barrel 12 are fixed to the casing 31 as they are tightened together.

For this reason, since the screw hole part 201 is formed in the mirror frame 208 side, and it is not necessary to provide a fixing part in the barrel 12 of the rotating side, it can suppress that the whole module is enlarged.

Another embodiment of the present invention will be described with reference to FIGS. 11 to 13. The example shown in the figure is an example of a camera module including an imaging element in the lens driving module.

Fig. 11 shows a plan view of the camera module according to another embodiment of the present invention, Fig. 12 shows what is seen by the arrow A-A in Fig. 11, and Fig. 13 shows what is seen by the arrow B-B in Fig. 11. In addition, the same code | symbol is attached | subjected to the same member as the camera module using the barrel shown in FIGS. 1-10, and the overlapping description is abbreviate | omitted.

As shown in the figure, a base 32 and a cover 33 are attached to the casing 31 constituting the camera module, and a circuit block 14 is attached. The second fixed lens group 211 is provided on the base 32, and the imaging device 16 is provided on the rear surface (lower side in the drawing) of the second fixed lens group 211. In addition, a first fixed lens group 212 is attached to a casing 31 at a position facing the imaging device 16 with the second fixed lens group 211 interposed therebetween.

Inside the casing 31 at both outer sides of the optical path opening of the first fixed lens group 212 and the second fixed lens group 211, the optical axis direction of the lens group over the cover 33 and the base 32. The 1st feed screw shaft 213 and the 2nd feed screw shaft 214 extended in the (up-down direction in drawing) are rotatably supported.

The first movable lens holder 216 is fastened to the threaded portion 215 of the first feed screw shaft 213, and the second movable lens holder 218 is fastened to the screwed portion 217 of the second feed screw shaft 214. have. The first movable lens group 219 is supported by the first movable lens holder 216, and the second movable lens group 220 is supported by the second movable lens holder 218.

That is, by rotating the first feed screw shaft 213 and the second feed screw shaft 214, the first movable lens holder 216 and the second movable lens holder 218 independently move and reciprocate in the vertical direction. The first movable lens group 219 and the second movable lens group 220 are operated at arbitrary positions independently of the first fixed lens group 212 and the second fixed lens group 211. As a result, zooming and focusing can be performed independently.

11 to 12, the first guide shaft 221 and the second guide shaft 222 are provided over the cover 33 and the base 32. Through holes 216a and 216b are formed in the first movable lens holder 216, and through holes 218a and 218b are formed in the second movable lens holder 218. The first guide shaft 221 penetrates the through holes 216a and 218a, and the second guide shaft 222 penetrates the through holes 216b and 218b. That is, the first movable lens holder 216 and the second movable lens holder are formed by the first guide shaft 221, the second guide shaft 222, the through holes 216a and 218a, and the through holes 216b and 218b. The reciprocating movement of only the up-down direction of 218 is allowed and the movement of a rotation direction is regulated (rotation control means).

On the other hand, a compression coil spring 223 as an elastic pressing means is provided between the first movable lens holder 216 and the second movable lens holder 218, and the compression coil spring 223 is the outer periphery of the optical path opening of the lens group. It is located on the side. The first movable lens holder 216 and the second movable lens holder 218 are elastically pressurized in a direction in which they are separated from each other by the compression coil spring 223, and the shaking is suppressed. For this reason, the 1st movable lens holder 216 and the 2nd movable lens holder 218 can be moved with precision. Moreover, by using the compression coil spring 223 of the diameter located in the outer peripheral side of the optical path opening of a lens group, an elastic pressing force acts also in a rotation direction, and the 1st movable lens holder 216 and the 2nd movable lens holder ( The radial shake of 218 can also be suppressed.

As shown in FIG. 11, FIG. 13, the 1st shielding part 224 is attached to the 1st movable lens holder 216, and the 1st detection part which the 1st shielding part 224 passes to the circuit block 14 side passes. 225 (for example, a photo interrupter) is provided. By detecting the first shielding portion 224 at the position of the first detecting portion 225, the predetermined position (for example, the home position) of the first movable lens holder 216 is detected. In addition, a second shielding portion 226 is attached to the second movable lens holder 218, and a second detecting portion 227 (for example, a photo) through which the second shielding portion 226 passes through the circuit block 14 side. Interrupter) is installed. By detecting the second shielding portion 226 at the position of the second detecting portion 227, a predetermined position (for example, the origin position) of the second movable lens holder 218 is detected.

As shown in FIG. 11, the base 32 in the side part of the 1st feed screw shaft 213 and the 2nd feed screw shaft 214 is equipped with the stepping motor 42. As shown in FIG. The stepping motor 42 is provided with the coil block 44, the yoke 45 (stator), the rotor 46, etc., and has the same structure as the stepping motor 42 shown to FIG. 2 and FIG. That is, the rotor 46 is the output side of the stepping motor 42.

The intermediate gear 228 is engaged with the rotor 46, and the transmission gear 229 is provided at the rotation shaft of the intermediate gear 228. Input gears 230 are provided at lower ends of the first feed screw shaft 213 and the second feed screw shaft 214, respectively, and the input gear 230 meshes with the transmission gear 229. Each gear shaft is supported by a cover 33 constituting the casing 31. In the figure, reference numeral 233 denotes a screw for fixing the member on the coil block 44 side, and 234 denotes a coil lead substrate.

That is, in FIG. 11, the driving force is transmitted to the input gear 230 through the rotor 46, the intermediate gear 228, and the transmission gear 229 by the driving of the stepping motor 42 on the left side, and the first transfer. The screw shaft 213 rotates. The first movable lens holder 216 reciprocates along the first guide shaft 221 and the second guide shaft 222 by the rotation of the first feed screw shaft 213, and the first movable lens group 219. It moves to this predetermined position. The movement of the first movable lens holder 216 is controlled by detecting the first shielding portion 224 by the first detecting portion 225.

In addition, in FIG. 11, the rotational force is transmitted to the input gear 230 through the rotor 46, the intermediate gear 228, and the transmission gear 229 by the driving of the stepping motor 42 on the right side, and the second transfer. The screw shaft 214 rotates. The second movable lens holder 218 reciprocates along the first guide shaft 221 and the second guide shaft 222 by the rotation of the second feed screw shaft 214, and the second movable lens group 220. It moves to this predetermined position. The movement of the second movable lens holder 218 is controlled by detecting the second shielding portion 226 by the second detecting portion 227.

Therefore, the stepping motor 42 which moves the 1st movable lens holder 216 (1st movable lens group 219) and the 2nd movable lens holder 218 (second movable lens group 220), respectively is provided. Therefore, one lens group can be moved by one motor, and the zoom and the focus and focus are driven independently, thereby enabling optimal zooming and focusing. Then, the first movable lens holder 216 (first movable lens group 219) and the second movable lens holder 218 (the first feed screw shaft 213 and the second feed screw shaft 214) are formed. 2 movable lens group 220, the space according to the difference between the thickness of the actuator and the height of the moving range of the lens group with respect to the base can be secured around the moving range of the lens group. Space in the radial direction can be secured.

In addition, the above-described embodiment has described an example in which two groups of fixed lens groups are provided, two groups of moving lens groups are provided, and two motors for operating the moving lens groups are provided. It can be applied as long as the fixed lens group and the moving lens group are combined to have at least two or more lens groups, and have at least one motor to move the moving lens group.

Industrial availability

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention is in the industrial field of a barrel drive device mounted on a portable electronic device such as a card type digital camera or a mobile phone with a camera and used for focusing, zooming, etc. of a barrel, and a camera module including the device. It is available.

In addition, the present invention is mounted on a portable electronic device such as a card-type digital camera, a mobile phone with a camera, and the like, and is provided with a lens driving module and a lens driving module used for focusing, zooming, and the like of a lens group. It can be used in the industry of modules.

According to the present invention, it is possible to provide a barrel drive device and a camera module which can suppress magnetic interference between adjacent stepping motors while securing a space around the barrel.

Moreover, according to this invention, even when a lens group (barrel) is moved using a feed screw, it becomes a lens drive module and a camera module which can reduce the plane space of the whole module.

Claims (24)

As a barrel drive device provided with a plurality of actuators on one surface of the base to individually exhibit a plurality of lens functions of the barrel, Each of the actuators includes a stepping motor and a transmission mechanism for linking the barrel to the motor, and the height of these actuators is lower than the height of the barrel relative to the one surface, and the actuators are connected to the barrel. The barrel drive device which mutually spaced apart around this barrel arrangement | positioning part arrange | positioned and developed and arrange | positioned along one surface of the said base. Bass, A focus actuator provided with a stepping motor and a transmission mechanism for interlocking a barrel having a focusing function and a zooming function to the motor and formed thinner than the barrel, and provided on one surface of the base; A stepping motor and a transmission mechanism for interlocking the barrel are provided on the motor, and are formed thinner than the barrel, and provided with a zoom actuator provided on the one surface. A barrel drive device in which the focus actuator and the zoom actuator are spaced apart from each other around a barrel arranging portion where the barrel is disposed, and deployed along one surface of the base. 3. The barrel drive device according to claim 2, wherein the stepping motor provided by the focus actuator and the zoom actuator is arranged in a symmetrical shape with the barrel arrangement portion interposed therebetween. The barrel drive device according to any one of claims 1 to 3, wherein a barrel passage portion is provided in a cover with each of the actuators between the base and the base. The coil block according to any one of claims 1 to 4, wherein the stepping motor has an iron core integrally provided with a yoke connection portion at the end of the core portion and an excitation coil wound around the core portion, the coil block disposed along one surface of the base. And a yoke portion other than the end connected to the yoke connecting portion without overlapping the coil block, the yoke having a rotor passage hole in the jar portion and a rotor disposed in the rotor passage hole. The barrel drive device according to any one of claims 1 to 5, wherein the rotor and the transmission mechanism are disposed to be offset from the coil block along the one surface. 7. The barrel drive device according to claim 6, wherein the transmission mechanism is formed of a reduction gear train, and the gear shaft of the gear train is arranged in the projection area of the stepping motor. 8. The barrel drive device according to claim 7, wherein said magnetic path portion has a shaft passage portion formed of a passage hole or a notch, and the gear shaft portion has passed through the shaft passage portion. 8. The barrel drive device according to claim 7, wherein a gap is formed between the magnetic path portion and the coil block, and the gear shaft is passed through the gap. A camera module provided with a plurality of actuators on one surface of the base to individually display a plurality of lens functions of the barrel, Each of the actuators includes a stepping motor and a transmission mechanism for linking the barrel to the motor, and the height of these actuators is lower than the height of the barrel relative to the one surface, and the actuators are connected to the barrel. The camera module spaced apart in the circumferential direction of and deployed along one surface of the base. Bass, A barrel having a focusing function and a zooming function, A focus actuator provided with a stepping motor and a transmission mechanism for interlocking the barrel with the motor, and formed thinner than the barrel, and provided on one surface of the base; A stepping motor and a transmission mechanism for interlocking the barrel with the motor, wherein the zoom actuator is formed thinner than the barrel, and is provided on the one surface; A camera module, wherein the focus actuator and the zoom actuator are separated from each other in the circumferential direction of the barrel and deployed along one surface of the base. The camera module according to claim 11, wherein the stepping motor provided by the focus actuator and the zoom actuator is arranged in a symmetrical shape with the barrel interposed therebetween. The method according to any one of claims 10 to 12, A camera module provided with a barrel passage portion in a cover to which the actuators are attached to the base. The method according to any one of claims 10 to 13, The stepping motor includes a coil block disposed along one surface of the base having an iron core integrally provided with a yoke connection portion at the end of the core portion and an excitation coil wound around the core portion, and a portion other than an end connected to the yoke connection portion. A camera module provided so as not to overlap with a block, the yoke having a rotor passage hole in the passage portion and a rotor disposed in the rotor passage hole. The method according to any one of claims 10 to 14, The camera module which arrange | positioned the said rotor and the said transmission mechanism between the said coil block and the said barrel. The camera module according to claim 15, wherein the transmission mechanism comprises a reduction gear train, and the gear shaft of the gear train is arranged in the projection area of the stepping motor. The camera module according to claim 16, wherein the magnetic path portion has a shaft passage portion formed of a passage hole or a cutout, and the gear shaft passes the shaft portion through the shaft passage portion. The camera module according to claim 16, wherein a gap is formed between the magnetic path portion and the coil block, and the gear shaft is passed through the gap. The method according to any one of claims 1 to 9, At the rear end of the barrel, a plurality of fixing screw through-holes are formed and a guide pin into which the sensor substrate is fitted is inserted. A barrel drive device which is fixed to a unit main body by inserting a screw and penetrating a fixing screw through hole to tighten a sensor substrate and a barrel together. The camera module of any one of Claims 1-9 or 19 provided with the imaging element in the barrel drive apparatus. At least two or more lens groups, At least one stepping motor formed with a width narrower than the movable range of the lens group, A feed screw shaft for reciprocating the at least one group of lens groups in the optical axis direction; Lens drive module having a gear train for transmitting the output of the stepping motor to the feed screw shaft. The method of claim 21, wherein the stepping motor, A coil block disposed along one side of the base with an iron core and an excitation coil wound around the core portion integrally provided with the yoke connection portion at the end of the core portion; Lens drive module consisting of a rotor is formed. The method of claim 21 or 22, Position detecting means for detecting the position of the lens group; A rotation control means allowing only the reciprocating movement of the lens group; A lens driving module comprising elastic pressing means for elastically pressing the lens group in one direction of the optical axis direction. A camera module comprising an imaging device in the lens driving module according to any one of claims 21 to 23.

Images