JP2007010934A - Optical module and camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an optical module which is compact, thin, satisfactory in movement accuracy, superior in assemblability and low cost. <P>SOLUTION: In the optical module, a stepping motor 26 and a lens barrel 27 moved by a moving means 28 are positionally deviated from each other, and arranged on one surface of a base plate 23 so that the optical axis of the lens barrel is parallel to the axial line of a rotor 37, and further, a reduction gear train 29 interlocking the rotor with the moving means is arranged on the same surface. A guide shaft 46 and a rotation-preventing shaft 49 are supported in cantilever structure perpendicularly to the reference surface of the base plate jointed to a circuit board 22. The rotation-preventing shaft is molded integrally with the base plate, and a coil block 35 and a yoke 36 integrated by welding and having a positioning reference hole are arranged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical module provided with an optical component moved for focus adjustment, zooming, and the like, and in particular, an optical module suitable for mounting on a thin electronic device such as a card-type digital camera or a camera-equipped mobile phone. It is related with the camera module provided with.

Conventionally, a camera module including a small and thin optical module is mounted on a small and thin mobile terminal such as a mobile phone. Solid-state imaging devices such as CCD-type image sensors and CMOS-type image sensors used in these camera modules are increasing in pixel count, and higher quality images are required. Therefore, autofocus, optical zoom, Functions such as macro shooting have been added.
Moreover, the structure which moves an optical component with a stepping motor as an autofocus function is disclosed (for example, refer patent document 1).
A configuration having both an autofocus function and a zoom function is also disclosed (for example, see Non-Patent Document 1).
JP 2005-148197 A http://www.sharp.co.jp/corporate/news/040916-a.htm

The camera module equipped with the optical module having the autofocus function described above has both the guide shaft necessary for moving the optical system support in the optical axis direction held up and down by the guide holes formed in the base plate and the cover, respectively. Has a holding structure. In the case of this structure, in order to ensure the perpendicularity of the guide shaft with respect to the image sensor, the upper and lower guide holes holding the guide shaft are required to have high precision in both component processing and assembly.
Next, a photo interrupter (hereinafter referred to as PI) for detecting the origin of movement of the optical system support is required to be connected to the circuit board, so that the assembly workability is poor and a general use of an adhesive is required. In the PI fixing method, problems such as fluctuations in the origin position due to softening of the adhesive also occur during reliability tests such as high temperature and high humidity.

  Also, parts necessary for moving an optical system support such as a guide shaft and a drive unit in the optical axis direction are held between the base plate and the cover. To hold these parts, the base plate and cover are joined with screws, but in the case of resin base plates, measures such as driving in and screwing metal parts are necessary to secure the screw tightening torque. Is also required. Furthermore, in order to prevent a decrease in screw tightening torque due to creep deformation, many man-hours are required for assembly, such as taking measures to prevent loosening by applying an adhesive to the screw.

  In view of the above problems, the present invention secures a squareness of the guide shaft with respect to the image pickup device, makes PI integration easy and highly accurate, and performs base plate and cover joining with a screw other than screws, so that the assembly is compact. It is an object to obtain an optical module and a camera module.

In order to achieve the above object, a first aspect of the present invention is directed to a base plate, a moving unit, an optical component guided and moved by a guide shaft arranged in the optical axis direction by the moving unit, and driving the optical component And a magnetic path component having three or more magnetic pole ends, and two or more wound respectively along the core portion. An excitation coil, a stepping motor provided with a rotor having an axis arranged in a direction twisted in the direction of the core, a gear train for interlocking the power output from the stepping motor with the moving means, and the origin of the moving means A detection unit for detecting a position is incorporated, and the optical module is configured by joining the base plate and the cover.
In the first aspect, it is possible to obtain an optical module that is small and thin and can be adjusted in focus according to the subject distance, which is suitable for incorporating a portable terminal.

According to a second aspect of the present invention, in the first aspect, the reference surface of the base plate in which the guide shaft and the rotation prevention shaft disposed at a position symmetrical to the guide shaft with the optical axis as the center are joined to the circuit board. The optical module is supported by a cantilever structure perpendicular to the optical module.
In the second aspect, since the squareness of the guide shaft with respect to the base plate reference surface can be secured with the processing accuracy of the base plate, the assembly of the base plate and the cover becomes easy, and the contact surface between the circuit board and the base plate is used as a reference. Thus, the inclination of the optical axis with respect to the image sensor can be restricted, and adjustment during assembly of the base plate and the circuit board can be made unnecessary.

According to a third aspect of the present invention, in the optical module according to the second aspect, the rotation prevention shaft is integrally formed with a base plate.
In the third aspect, by integrating the rotation prevention shaft with the base plate, the number of parts can be reduced, the number of sub-assembly steps can be reduced, and the cost can be reduced.

  According to a fourth aspect of the present invention, in the first aspect, the stepping motor is a positioning in which a yoke having a rotor through hole and a coil block formed of an iron core and an exciting coil are integrated by sub-assembly by welding. The optical module includes a stator having a reference hole and a rotor.

  In the fourth aspect, since the force for closely contacting the yoke and the iron core necessary for forming the magnetic path of the stator composed of the yoke and the coil block can be secured by welding, the method for joining the cover and the base plate is simplified. Can do.

  According to a fifth aspect of the present invention, in the first aspect, the stepping motor is configured such that a yoke having a rotor through hole and a coil block composed of an iron core and an exciting coil are subsidized by a metal caulking pin having a positioning reference portion. An optical module comprising a stator integrated by assembly and a rotor.

  In the fifth aspect, since the force for tightly contacting the yoke and the iron core necessary for forming the magnetic path of the stator composed of the yoke and the coil block can be secured by caulking, the method for joining the cover and the base plate is simplified. Can do.

According to a sixth aspect of the present invention, in the first aspect, the detection unit is mounted in advance on a drawer substrate of the detection unit that is positioned by a positioning pin of the base plate and is incorporated into the base plate from above the base plate, and has elasticity. The optical module is pressed against a base plate by a cover via a detection unit.
In the sixth aspect, for example, PI can be incorporated as the detection unit from the same direction as other parts, so that the assemblability is improved. In addition, the structure is pressed against the base plate by the PI presser, so that the origin position does not change and the reliability can be improved.

According to a seventh aspect of the present invention, in the first aspect, the positioning pin protruding from the base plate and the cover having a guide hole corresponding to the positioning pin are joined by thermal deformation of the positioning pin. In the optical module.
In the seventh aspect, since the plurality of positioning pins can be deformed by heat at the same time and the base plate and the cover can be joined, the number of assembling steps can be reduced. Further, since no joining parts such as screws are required, the number of parts can be reduced and the cost can be reduced.

According to an eighth aspect of the present invention, in the first aspect, the base plate and the cover are joined by a boss formed on a side surface of the base plate and a cover fixing plate having a notch corresponding to the boss and having elasticity. The optical module is characterized by the following.
In the eighth aspect, since the base plate and the cover can be joined by the cover fixing plate, the number of assembling steps can be reduced.

According to a ninth aspect of the present invention, there is provided a camera including the optical module according to any one of the first to ninth aspects, an image sensor that converts an optical image into an electrical signal, and a control unit that controls the operation of the image sensor. In the module.
In the ninth aspect, the optical axis of the guide shaft with respect to the image sensor is secured, the PI is easily and highly accurately integrated, and the base plate and the cover are joined by means other than screws, so that a small optical module with good assemblability is obtained. And a camera module.

  ADVANTAGE OF THE INVENTION According to this invention, the optical module and camera module which are suitable for the built-in of a portable terminal, and are used for the imaging device which can adjust a focus according to a to-be-photographed object distance are thin.

  A first embodiment of the present invention will be described with reference to FIGS.

  An optical module, for example, a lens driving device indicated by reference numeral 21 in FIGS. 1 to 7 is mounted on a thin electronic device such as a card-type digital camera or a camera-equipped mobile phone. The lens driving device 21 includes a base plate 23, a cover 25, a stepping motor 26, optical components such as a lens barrel 27, a moving unit 28, and a reduction gear train 29 as a gear train.

  The circuit board 22 is a hard board, and an image pickup device 30 such as a CCD or a CMOS is mounted on one surface thereof. A base plate 23 is attached to the one surface of the circuit board 22. The base plate 23 is, for example, rectangular, and has a hole 23e for accommodating the imaging element 30 and allowing the lens barrel 27 to be disposed at one end portion in the longitudinal direction. The cover 25 having the positioning guide holes 25b is disposed on the base plate 23 provided with positioning pins 23g at positions facing the guide holes 25b. The cover 25 has a window hole 25 a that faces the incident surface of the lens barrel 27.

  The cover 25 also serves as a member that supports and fixes the stepping motor 26 and the reduction gear train 29 with the base plate 23 interposed therebetween. This cover 25 is joined and fixed by arranging the cover 25 while being positioned by a plurality of, for example, four positioning pins 23g provided on the base plate 23, and thermally deforming the positioning pins 23g with a caulking device or the like.

  The stepping motor 26 is a two-pole motor having a step angle of 180 °, for example, and includes a coil block 35, a yoke 36, and a rotor 37 as shown in FIGS. The coil block 35 and the yoke 36 form a stator.

  The coil block 35 has an iron core 38 and an excitation coil 39. The iron core 38 is integrally formed with yoke connecting portions 38b and 38c at both ends in the longitudinal direction of the core portion 38a (see FIG. 7). As a preferred example, the pair of coil blocks 35 are provided so that the rotational speed when the rotor 37 is rotated forward and when the rotor 37 is rotated backward is the same. In particular, in the present embodiment, since the yoke connecting portions 38c are shared in order to integrate these coil blocks 35, the yoke connecting portions 38b are respectively provided on both sides of the mounting portion 38c via the core portions 38a. Yes. The exciting coils 39 are respectively wound around the core portion 38a.

  The yoke 36 for guiding the magnetic flux generated by the excitation of the exciting coil 39 has a flat plate shape and has end portions 36b and 36c connected to the yoke connecting portions 38b and 38c. The pair of end portions 36b are respectively connected to the yoke connecting portion 38b, and the other one end portion 36c located between the pair of end portions 36b is connected to the yoke connecting portion 38c. The magnetic path portion 36 a excluding the end portions 36 b and 36 c of the yoke 36 protrudes to the side of the coil block 35 without overlapping the coil block 35. A rotor through hole 40 is formed in the magnetic path portion 36a.

  A gap 41 is formed between the magnetic path portion 36 a and the coil block 35. At least part of the side surface of the exciting coil 39 faces the gap 41. 3 and 6, reference numeral 42 indicates a recess in the magnetic path portion 36 a provided around the rotor through hole 40. Between the recess 42 and the rotor through hole 40 and between the air gap 41 and the rotor through hole 40, the magnetic path cross-sectional area is extremely small, and magnetic saturation is very easily performed. For this reason, the inner peripheral surface of the rotor through-hole 40 is substantially divided at a portion where the magnetic path cross-sectional area is minimal. Each of the divided areas functions as a magnetic pole tip, and an S pole or an N pole appears at the magnetic pole tip every time a drive pulse is applied to the exciting coil 39. Here, the magnetic pole end has three magnetic pole ends, and the magnetic pole end and the end of the excitation coil 39 are magnetically connected in order to propagate the magnetic lines of force generated in the excitation coil 39 to each magnetic pole end. Of the three magnetic pole ends, one is magnetically connected to the ends of the two exciting coils.

  A rotor 37 is disposed in the rotor through hole 40. The outer peripheral portion of the rotor 37 is magnetized with different polarities for each predetermined region adjacent in the circumferential direction. Therefore, the stepping motor 26 has a step angle of 180 ° by the magnetic action between the magnetic pole end and the magnetic pole of the rotor 37 every time a driving pulse is applied to the exciting coil 39 via a motor driver (not shown). It is rotated. A drive gear 43 is connected to or integrally formed with the rotor 37. Both ends of the rotation shaft 44 of the rotor 37 are rotatably supported by the base plate 23 and the cover 25.

  The stepping motor 26 is disposed along the edge of the base plate 23. Specifically, as shown in FIG. 3, the coil block 35 is disposed along the edge 23 a of the other end portion in the longitudinal direction of the base plate 23. The coil block 35 and the yoke 36 form a magnetic path at the yoke connecting portion 38b and the end portion 36b of the yoke 36 connected thereto, or the end surface of the yoke connecting portion 38c and the end portion 36c of the yoke 36 connected thereto. The yoke 36 and the iron core 38 necessary for this are integrated and fixed by being joined by welding at least one place. The stepping motor 26 is supported by positioning pins 23g provided in the base plate 23 with positioning holes 36d of the yoke connecting portion 38b of the iron core and the yoke end 36b, and can be fixed with the stepping motor 26 sandwiched between the cover 25 and the stepping motor 26. With this fixing, as shown in FIG. 3, the peripheral surface of the exciting coil 39 is disposed along the base plate 23, and the magnetic path portion is disposed along one surface of the base plate 23. Further, a coil lead board to which an end of the exciting coil is connected to the iron core 38 so as to protrude from the edge 23 a of the base plate 23 in the planar direction at the central portion 38 c of the iron core 38.

  The lens barrel 27 has a plurality of lenses 27a housed therein. A lens barrel holder 45 is attached to the outer periphery of the lens barrel 27. A plurality of, for example, a pair of sliding portions 45a and a rotation preventing portion 45b are preferably provided on the outer periphery of the lens barrel holder 45 so as to substantially correspond to the radial direction, and these sliding portions 45a are formed of through holes or concave grooves. It has a shaft sliding element. Alternatively, the lens barrel holder 27 and the lens barrel 45 may be integrated by attaching a plurality of lenses 27 a directly to the lens barrel holder 45. Around the lens barrel 27, a guide shaft 46 that is supported in a cantilever structure perpendicularly to the reference surface 23 f of the base plate 23 is attached at least at one location across the base plate 23 and the cover 25. Is passed through the shaft sliding element.

  On the side opposite to the guide shaft 46, a rotation prevention shaft 49 is provided in parallel with the optical axis O of the lens barrel 27 and the guide shaft 46 in order to prevent the lens barrel 27 supported and fixed to the base plate 23 from rotating in the plane direction. It has been. Further, the rotation preventing shaft 49 can also serve as a rotation preventing function as a shaft integrally formed with the base plate 23. As a result, the lens barrel 27 faces the image sensor 30 and is supported so as to be movable along at least one guide shaft 46 in the direction of contact with and away from the image sensor 30. Since it is supported by the rotation prevention shaft 49, it moves parallel to the optical axis O. By this movement, the focusing operation of the lens barrel 27 with respect to the image sensor 30 is performed.

  The lens barrel 27 supported as described above is shifted from the stepping motor 26 toward one end in the longitudinal direction of the base plate 23, and its optical axis O is parallel to the axis A of the rotor 37. A coil spring 47 is disposed on the guide shaft support portion 23 c of the base plate 23 that holds the guide shaft 46 close to the stepping motor 26. The coil spring 47 is sandwiched between the sliding portion 45 a through which the guide shaft 46 penetrates and the base plate 23, and biases the lens barrel 27 in a direction away from the image sensor 30 via the lens barrel holder 45.

  An outward projecting portion 48 projects from the outer periphery of the lens barrel holder 45. For example, the outward projecting portion 48 projects to the stepping motor 26 side and is continuous with the sliding portion 45a. The outward projecting portion 48 and the sliding portion 45a may not be continuous.

  The moving means 28 includes a feed screw 51 and a nut member 52. As shown in FIG. 4, the feed screw 51 forms a part of the gear shaft 53. The gear shaft 53 is supported by the cover 25 and the nut member 52 of the outward projecting portion 48 facing in the vicinity thereof, and one end portion of the gear shaft 53 is supported by the cover 25. The nut member 52 is fixed to the outward projecting portion 48, and the feed screw 51 is engaged with the nut member 52. Therefore, when the gear shaft 53 is rotated, the rotation is converted by the moving means 28 into a movement that moves the lens barrel holder 45 along the axial direction of the feed screw 51. Therefore, the lens barrel 27 is moved along the optical axis O.

  The moving means 28 and the rotor 37 are connected via a reduction gear train 29 arranged on one surface side of the base plate 23. As shown in FIGS. 3 and 4, the reduction gear train 29 has a plurality of, for example, first to third reduction gears 55 to 57 made of spur gears. The first reduction gear 55 is engaged with the drive gear 43 of the rotor 37, and the second reduction gear 56 rotated together with the first reduction gear 55 is engaged with the third reduction gear 57. The third reduction gear 57 is attached to the gear shaft 53. Both ends of a gear shaft 58 that supports the first reduction gear 55 and the second reduction gear 56 are rotatably supported by the base plate 23 and the cover 25. Therefore, when the stepping motor 26 is driven and the rotor 37 is rotated, the rotation is decelerated by the reduction gear train 29 and given to the moving means 28.

  As a detection unit for detecting the origin of the lens barrel 27 that moves along the guide shaft 46, a photo interrupter 71 is disposed in the recess notch of the base plate 23, and a protrusion is formed on a part of the outer periphery of the lens barrel holder 45. The movement of the protrusion is detected by a cross-sectional movement that does not overlap with the photointerrupter 71 provided. A guide hole 73a of the PI lead-out board 73 connected in advance to the PI terminal 71a of the photo interrupter 71 by soldering or the like is supported by positioning pins 23g of the base plate 23. The PI retainer 72 disposed on the upper surface of the PI 71 has one end sandwiched between the base plate 23 and the iron core 38, the other end sandwiched between the base plate 23 and the cover 25, and an elastic force generated by a step between the base plate 23 and the PI 71. Is pressed against the base plate 23 and fixed. Since the PI lead-out board 73 protrudes from the edge 23a of the base plate 23, the connection to the circuit board 22 is facilitated by a connection board (not shown).

  A PI drawer substrate 73 that is positioned by the positioning pins 23 h of the base plate 23 is mounted in advance on the PI 71. The PI 71 is incorporated from above the base plate 23 and is pressed against the base plate 23 by the cover 25 via the elastic PI retainer 72 supported by the positioning pins 23g of the base plate 23, so that the origin position does not vary and the reliability is improved. . Furthermore, since the PI 71 can be assembled from the same direction as other parts, the assemblability is improved.

  As described above, the lens driving device 21 in which the stepping motor 26, the lens barrel 27, the moving means 28, and the reduction gear train 29 are arranged on one surface of the base plate 23 is arranged as shown in FIG. 46 and an anti-rotation shaft 49 disposed at a position symmetrical to the guide shaft 46 with the optical axis O as the center are supported in a cantilever structure at right angles to the reference surface 23f of the base plate 23 joined to the circuit board 22. As a result, the squareness of the guide shaft 46 with respect to the reference surface 23f of the base plate 23 can be ensured with the processing accuracy of the base plate 23, so that the base plate 23 and the cover 25 can be easily assembled. By using the contact surface as a reference, the inclination of the optical axis O with respect to the image sensor 30 can be regulated, and the base plate 23 and the circuit board can be regulated. 22 is adjusted at the time of assembling the unnecessary.

  In addition, as shown in FIG. 5, the rotation prevention shaft 49 is integrally formed with the base plate 23, so that the rotation prevention shaft 49 is integrated with the base plate 23 by using resin, thereby reducing the number of parts and sub-assembly. Man-hours can be reduced and costs are reduced.

  Further, as shown in FIGS. 6 and 7, the stator is formed by integrating a yoke 36 having a rotor through hole 40 and a coil block 35 including an iron core 38 and an exciting coil 39 by sub-assembly by welding. Since the force for bringing the yoke 36 and the iron core 38 into close contact with each other to form the magnetic path of the stator can be secured by welding, it can be easily assembled into the base plate, and the method for joining the cover 25 and the base plate 23 can be improved. It can be simplified.

By joining the positioning pin 23g protruding from the base plate 23 and the cover 25 having the guide hole 25b corresponding to the positioning pin 23g, the positioning pin 23g is thermally deformed by an apparatus or the like, thereby obtaining a plurality of positioning pins 23g. At the same time, the base plate 23 and the cover 25 can be joined by being deformed by heat, so that the number of assembling steps can be reduced. Further, since no joining parts such as screws are required, the number of parts can be reduced and the cost can be reduced.
As described above, it is possible to obtain a small and thin optical module suitable for incorporation in a mobile terminal.

  8 and 9 show a second embodiment of the present invention. Since this embodiment is basically the same as the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, the differences from the first embodiment are described. explain.

In the second embodiment, the coil block 35 and the yoke 36 are composed of an iron yoke connecting portion 38b and an end portion 36b of the yoke 36 connected thereto, and an iron yoke connecting portion 38c and an end portion of the yoke 36 connected thereto. 36c, and a metal caulking pin that forms the positioning portion 75b, the collar 75c, and the caulking portion 75a in the stator in which the positioning holes 36d are disposed at one or more places in a position including a position substantially at the center of the end 36b and the end 36c 75 is disposed in the positioning hole 36d of the coil block 35 and the yoke 36 from below. The caulking portion 75a (after caulking in the figure) of the caulking pin 75 is deformed by pressure from above with an apparatus, a jig or the like after the metal caulking pin is arranged, and the coil block 35 and the yoke 36 are closely attached and fixed. In addition, when applying pressure, a cradle for receiving by the collar 75c of the metal caulking pin 75 is used. Further, the positioning portion 75b and the collar 75c of the metal caulking pin 75 for supporting the stator are provided with holes or grooves for positioning at least two locations, and the stator is supported and fixed by the metal caulking pin 75. Further, a recess relief shape is provided in the vicinity of the caulking portion 75 a of the cover 25. The stator is supported and fixed so as to be sandwiched between the cover 25 and the base plate 23.
The configuration other than the points described above is the same as that of the first embodiment.

  Therefore, the stator integrates the yoke 36 having the rotor through-hole 40 and the coil block 35 composed of the iron core 38 and the exciting coil 39 by sub-assembly by the metal caulking pin 75 having the positioning portion 75b, and the magnetic path is integrated. The metal caulking pin 75 can secure the force required to make the yoke 36 and the iron core 38 in close contact with each other, so that it can be easily incorporated into the base plate and the method for joining the cover 25 and the base plate 23 can be simplified.

  12 and 13 show a third embodiment of the present invention. Since this embodiment is basically the same as the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Hereinafter, the differences from the first embodiment are described. explain.

In the third embodiment, the cover fixing plate 50 having elasticity having notches 50a at positions corresponding to the bosses 23i formed on the side surface of the base plate 23 and the bosses 23i arranged on the upper surface of the cover 25 is provided. Be placed. Further, in the vicinity of the upper end portion of the cover 25, a slope 23j is provided along the shape of the cover fixing plate 50. The cover fixing plate 50 is elastically moved downward near the inclined surface 23j of the cover 25 so that the boss 23i and the notch 50a are engaged, and the base plate 23 and the cover 25 are joined. The configuration other than the points described above is the same as that of the first embodiment.
With the above configuration, the base plate 23 and the cover 25 are joined by the boss 23i formed on the side surface of the base plate 23 and the cover fixing plate 50 having the notch 50a corresponding to the boss 23i and having elasticity. Thus, since the base plate 23 and the cover 25 can be simply joined, the number of assembling steps can be reduced.
The configuration other than the points described above is the same as that of the first embodiment.

  A fourth embodiment of the present invention will be described with reference to FIG. Since the optical module unit in this embodiment is basically the same as that in the first embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Will explain the different points.

The camera module 100 includes an optical module 21, a circuit block 101, and an image sensor 30. The circuit block 101 includes a control unit 111, a motor driver 105, a signal processing unit 113, and the like. The control unit 111 includes a CPU, a memory, and the like, and is responsible for overall control of the optical module 21 of the camera module 100 including control of the operation of the image sensor 30 and the like. The motor driver 105 applies a required number of drive pulses to the stepping motor 26, and the signal processing unit 113 processes the image signal output from the image sensor 30 and supplies it to the control unit 111. All or a part of the electronic components constituting the circuit block 101 and the image sensor 30 are mounted on the circuit board 22 and connected to a circuit pattern provided on the circuit board 22.
Next, the assembly procedure of the optical module 21 will be described.

  A coil spring 47 is placed on the base plate 23 to which the guide shaft 46 is fixed in advance by press fitting or the like, and the lens barrel holder 45 to which the nut member 52 is fixed is placed on the coil spring 47 along the guide shaft 46. Further, the PI 71 is fixed at a predetermined position of the base plate 23, the PI presser 72 is disposed on the positioning pin 23g of the base plate 23 from the upper surface thereof, and the PI lead-out board 73 previously joined to the PI 71 on the positioning pin 23h of the base plate 23 is further provided. Place. A stator in which the coil block 35 and the yoke 36 are integrated is disposed at a predetermined position of the base plate 23. Next, from the upper side, an operation of arranging the reduction gear train 29 such as the rotor 37 for screwing the feed screw 51 into the nut member 52 is performed. Next, the cover 25 is joined from the upper side by thermally deforming the positioning pins 23g of the base plate 23 with an overlapping caulking device or the like. When the feed screw 51 is screwed into the nut member 52, the through hole 61 serves as a guide for the feed screw 51 and is easy to assemble.

  Since all of the series of operations up to this point can be assembled by overlapping the base plate 23 from one direction, the workability is very good.

After these operations, the image sensor 30 and the circuit board 22 on which electronic components are mounted are attached to the base plate 23. In addition, the signal terminal unit from the control unit 111 provided on the circuit board 22 is connected to the PI drawer substrate 73 of the detection unit. Further, the lens barrel 27 is screwed into the lens barrel holder 45.
In this way, the optical module 21 and the camera module 100 can be assembled.

It is a perspective view which shows the external appearance of the camera module of this invention. It is a disassembled perspective view of the camera module of this invention. It is a top view which shows the lens moving apparatus of this invention in the state which removed the cover. It is sectional drawing which shows the lens moving apparatus of this invention along the XX line in FIG. It is sectional drawing of the structure which uses the rotation prevention pin integrated with the baseplate. It is a perspective view of the stator which integrated the coil block and the yoke by welding. It is sectional drawing of the stator which integrated the coil block and the yoke by welding. It is a perspective view of the stator which integrated the coil block and the yoke with the caulking pin. It is sectional drawing of the stator which integrated the coil block and the yoke with the crimping pin. It is a perspective view which shows the state which mounted PI on the PI drawer | drawing-out board | substrate. It is sectional drawing which shows the state which is fixing PI by PI holding | suppressing. It is a perspective view which shows the state which has joined the base plate and the cover with the cover fixing plate. It is sectional drawing which shows the state which has joined the base plate and the cover with the cover fixing plate. It is sectional drawing which shows the state which has joined the base plate and the cover with the screw | thread and the attachment axis | shaft. It is a top view which shows the lens moving apparatus which concerns on a prior art example in the state which removed the cover. It is sectional drawing which shows the lens moving apparatus which concerns on a prior art example. It is a block diagram which shows the camera module which concerns on 4th Embodiment of this invention.

Explanation of symbols

21 Lens drive device (optical module)
22 Circuit board
23 Base plate
23a Base plate edge
23b Base plate wall
23c Guide shaft support
23d Anti-rotation pin
23e hole
23f Reference plane
23g Locating pin
23h Positioning pin
23i boss
23j slope
24 Infrared cut filter
25 Cover
25a Window hole
25b Guide hole
26 Stepping motor
27 Lens tube (optical components)
27a Lens group
O Optical axis of lens barrel
28 Means of transportation
29 Reduction gear train
30 Image sensor
31 Mounting shaft
32 screws
35 Coil block
36 York
36a Magnetic part of the yoke
36b Yoke end
36c Yoke end
36d positioning hole
37 rotor
A Rotor axis
38 Iron core
38a Iron core
38b Yoke connecting part of iron core
38c Yoke connecting part of iron core
39 Excitation coil
40 Rotor through hole
41 Air gap
42 dent
43 Drive gear
44 Rotation axis
45 Lens holder
45a Slide part of lens barrel holder
45b Anti-rotation part of lens barrel holder
46 Guide shaft
47 Coil spring
48 Outward protrusion
49 Anti-rotation shaft
50 Cover fixing plate
50a cutout
51 Lead screw
52 Nut member
53 Gear shaft
55 Reduction gear
56 Reduction gear
57 Reduction gear
58 Gear shaft
61 through hole
62 Notch
71 Photointerrupter (PI)
71a PI terminal
72 PI presser
73 PI drawer board
73a Guide hole
75 Caulking pin
75a Caulking section
75b Positioning part
75c collar
100 camera modules
101 circuit block
105 Motor driver
111 Control unit
113 Signal processor

Claims (9)

  A moving means on the base plate, an optical component guided and moved by a guide shaft arranged in the optical axis direction by the moving means, and a direction twisted with respect to the optical axis direction which is a power source for driving the optical component A magnetic path constituent member having a core portion extending to three or more magnetic pole ends, two or more exciting coils wound respectively along the core portion, and an axis line in a direction twisted in the direction of the core portion A stepping motor having a rotor disposed therein, a gear train that interlocks the power output from the stepping motor with the moving means, and a detection unit that detects an origin position of the moving means, and the base plate and the cover are incorporated. An optical module constructed by bonding.   2. The optical module according to claim 1, wherein the guide shaft and an anti-rotation shaft disposed at a position symmetrical to the guide axis with the optical axis as a center are perpendicular to a reference plane of a base plate joined to the circuit board. An optical module that is supported by a holding structure.   The optical module according to claim 2, wherein the rotation prevention shaft is integrally formed with a base plate.   2. The optical module according to claim 1, wherein the stepping motor is a stator having a positioning reference hole in which a yoke having a rotor through hole and a coil block constituted by an iron core and an exciting coil are integrated by welding sub-assembly. An optical module comprising a rotor.   2. The optical module according to claim 1, wherein the stepping motor is a stator in which a yoke having a rotor through hole and a coil block constituted by an iron core and an exciting coil are integrated by subassembly by a metal caulking pin having a positioning reference portion. And an optical module comprising a rotor.   The optical module according to claim 1, wherein the detection unit is mounted in advance on the drawer substrate of the detection unit that is positioned by a positioning pin of the base plate, and is incorporated into the base plate from above the base plate, via the elastic holding unit of the detection unit. The optical module is pressed against the base plate by a cover.   2. The optical module according to claim 1, wherein the positioning pin protruding from the base plate and the cover having a guide hole corresponding to the positioning pin are joined by thermal deformation of the positioning pin.   The optical module according to claim 1, wherein the base plate and the cover are joined by a boss formed on a side surface of the base plate and a cover fixing plate having a notch corresponding to the boss and having elasticity. Optical module.   A camera module comprising: the optical module according to claim 1; an image sensor that converts an optical image into an electrical signal; and a control unit that controls the operation of the image sensor.

Images