JP2007101626A - Camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact camera module having a plurality of optical members equipped, with lenses having different optical characteristics and being displaced freely in three-dimensional directions, which has a mode changing function, and prevents the respective optical members from interfering with other members. <P>SOLUTION: An operation member 18 for displacing the plurality of optical members 4 and 5 independently to an optical axis position, corresponding to an optical axis and a retreat position deviated from the optical axis is a cam member equipped with cam parts 19 and 28, corresponding to the respective optical members 4 and 5. The cam parts 19 and 28 are formed around the support shaft 18a of the cam member 18 and are equipped with a first cam surface 20 formed on a plane along the support shaft 18a in order to make the optical members 4 and 5 retreat to the retreating position; a second cam surface 22, formed on a plane crossing with the support shaft 18a, in order to focus the optical members 4 and 5 at the optical axis position; and a third cam surface 36, formed on a plane crossing the support shaft 18a around the first cam surface 20, in order to positionally regulate the optical members 4 and 5, in a direction along a support shaft 14 at the retreating position. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera module mounted on a portable terminal or the like.

2. Description of the Related Art Conventionally, a camera module is known in which a magnification is changed using a single lens by switching the lens between a position on the optical axis and a position off the optical axis (for example, Patent Document 1). . A camera module is also known in which a magnification is changed by selectively switching a plurality of lenses having different focal lengths (for example, Patent Document 2).
JP-A-6-102572 Japanese Patent No. 2657104

  Recently, so-called mobile terminals such as mobile phones have also been equipped with camera modules that allow easy shooting, but respond to demands for diversified shooting modes, advanced shooting technology, and higher functionality. For this reason, for example, a mode conversion function has been pursued so that magnification change and focus adjustment can be appropriately selected. However, the conventional camera modules (Patent Documents 1, 2, etc.) do not have a focus adjustment function.

  In order to enable focus adjustment in addition to changing the magnification, a plurality of optical members each having a lens having different optical characteristics can be displaced in a direction along the optical axis and in a direction intersecting the optical axis. Each must be supported independently. When such a configuration is realized in a limited space in the camera module, not only miniaturization and simplification are required, but also an accurate operation is required, which cannot be easily realized. In particular, when displacing each optical member in the direction intersecting the optical axis, it is necessary to regulate the operation in the direction along the optical axis, but this is not easy to perform in a limited space.

  The present invention has been made in view of such circumstances, has a plurality of optical members that are displaceable in a three-dimensional direction with lenses having different optical characteristics, has a mode conversion function, and uses the optical members as light. An object of the present invention is to provide a camera module capable of restricting the movement in the direction along the optical axis when displacing in the direction intersecting the axis.

  (1) A camera module according to the present invention includes a plurality of optical members that are provided with lenses having different optical characteristics and are movably supported in a direction along the optical axis and in a direction intersecting the optical axis. The operation member that is independently displaced to the optical axis position corresponding to and the retracted position deviated from the optical axis is driven by a single driving means, and the operation member is A cam member having a cam portion corresponding to each optical member, wherein the cam portion is formed around a support shaft of the cam member and is in-plane along the support shaft so as to retract the optical member to the retracted position. A first cam surface formed on the surface, a second cam surface formed in a plane intersecting the support shaft to adjust the focus of the optical member at the optical axis position, and the optical member at the retracted position. Direction along the spindle A third cam surface formed on the intersecting pivot plane around said first cam surface for regulating the position, characterized in that it comprises a.

  According to the camera module having the above configuration, the cam portion is formed around the support shaft of the cam member, and the first cam surface for retracting the optical member to the retracted position and the optical member at the optical axis position are focus-adjusted. And a second cam surface for moving the operation member by a single drive means, thereby displacing each optical member so that a lens having a different characteristic is retracted and retracted with respect to the optical axis. The magnification can be changed by moving the lens on the optical axis, and the optical member can be displaced along the optical axis to adjust the focus.

  Since the cam portion forms a third cam surface around the first cam surface for restricting the position of the optical member at the retracted position, each optical member moves from the second cam surface to the third cam surface and the first cam surface. If it shifts to one cam surface, it becomes possible to shift from the focus adjustment mode to a retreat mode with position restriction, and to restrict the position of the optical member in the direction along the support shaft at the retreat position.

  (2) In such a camera module, as a configuration of the cam portion of the operation member functioning as a cam, the first cam surface has a small-diameter relief portion and is formed to have a large diameter and an outer peripheral surface of the large diameter portion. The second cam surface has an inclined portion that is spaced apart from the relief portion radially outward of the support shaft and is inclined along a circumferential direction in a plane that intersects the support shaft, The third cam surface has a small-diameter relief portion that has a small-diameter relief portion that is formed in a flat shape so as to extend radially outward from a portion of the relief portion near the support shaft and surround the outer periphery of the large-diameter portion. You may make it form. In this way, the three cam surfaces that perform the surface magnification change mode, the focus adjustment mode, and the retraction mode with position restriction can be formed in a single operation member, thereby reducing the number of parts and the configuration. It can be simplified.

  (3) A cam follower in contact with the third cam surface and a cam follower in contact with the third cam surface, and a cam follower in contact with the third cam surface. A predetermined drop is set between the surface and the contact surface of the cam follower that contacts the second cam surface, and the third cam surface faces the second cam surface across the support shaft. In addition, a head corresponding to the predetermined head may be set between the third cam surface and the second cam surface at the opposite location. In this way, since the cam follower that contacts the third cam surface and the cam follower that contacts the second cam surface are provided separately, the correspondence between the cam surface and the cam follower is clarified in the configuration. As a result, accurate operation can be ensured.

  (4) A cam follower in contact with the third cam surface and a cam follower in contact with the third cam surface, and a cam follower in contact with the third cam surface. A predetermined drop is set between the surface and the contact surface of the cam follower that contacts the second cam surface, and the third cam surface faces the second cam surface across the support shaft. And at the opposite portion, between the third cam surface and the second cam surface, at the transition from the second cam surface to the third cam surface, the predetermined drop A smaller head may be set, and a head larger than the predetermined head may be set at the transition portion from the third cam surface to the second cam surface. If it does in this way, in addition to the effect | action and effect of said (3), a cam follower will be able to change now smoothly between a 2nd cam surface and a 3rd cam surface.

  (5) The contact surface of the cam follower that contacts the second cam surface and the contact surface of the cam follower that contacts the third cam surface may be formed in a curved surface shape. In this way, a smooth sliding contact operation of the cam follower is obtained, and the contact resistance with respect to the cam surface is reduced.

  According to the camera module of the present invention, in addition to the magnification change mode and the focus adjustment mode, the three cam surfaces that realize the retraction mode with position restriction in the direction along the optical axis of each optical member are formed as a single operation member. Since it is formed, a camera module advantageous for downsizing can be provided without increasing the number of parts.

  A camera module according to an embodiment of the present invention will be described in detail with reference to the drawings.

  1A to 1C are perspective views of the operation member, FIG. 2 is a perspective view of the optical member, FIGS. 3A and 3B are plan views showing the correspondence between the operation member and the optical member, and FIG. FIGS. 5A and 5B are perspective views showing the correspondence between the operation member and the optical member, FIG. 5 is a perspective view showing the internal configuration of the camera module in a state where the optical member is in the retracted position, and FIG. It is a perspective view which shows the structure inside the camera module in the state in an optical axis position.

  First, the overall configuration of this camera module will be described. As shown in FIGS. 5 and 6, the camera module includes an imaging device 1, optical members 4 and 9 having lenses 5 and 10 having different optical characteristics, and operations for operating the optical members 4 and 9. A member 18 and a driving means 32 for driving the operation member 18 are provided, and are housed in a housing 33 (see FIG. 7). External light is passed through the lenses 5 and 10 to the housing 33 and the imaging element. 1 is formed on the front side of one lens 5.

  The imaging device 1 is a well-known device such as a CCD or C-MOS, and has an imaging surface 2 on the inside, and the periphery of the imaging surface 2 is surrounded by a wall 3.

  One optical member 4 is disposed on the subject side, and the other optical member 9 is disposed on the image sensor 1 side. The optical members 4 and 9 are pivotally supported on a common support shaft 14 so as to be independently rotatable and axially displaceable. The support shaft 14 is provided in a direction along the optical axis, and the optical members 4 and 9 rotate in a plane substantially perpendicular to the support shaft 14, that is, in a plane orthogonal to the optical axis. The optical axis position corresponding to the optical axis and the retracted position deviating from the optical axis are displaced. Between the optical members 4 and 9, a light shielding plate 15 having an opening hole and a shutter 16 driven by an actuator such as an electromagnet are interposed.

  The optical member 4 has a long focal length tele lens 5 having a circular periphery, a frame portion 6 provided so as to surround the periphery of the tele lens 5, an arm portion 7 extending from a part of the frame portion 6, and The operation member 18 includes a follower portion 8 along a cam portion described later. As shown in FIG. 2 which is a perspective view of the optical member 4 not fitted with a lens as viewed from the back side, two cam followers 8a and 8b having curved contact surfaces are provided on the follower portion 8 with a predetermined drop g. As will be described later, one cam follower 8a is in urging contact with the second cam surface 22, and the other cam follower 8b is in urging contact with the third cam surface 36 (see FIG. 3 (A) (B)). The shooting hole 34 formed in the housing 33 is formed to have a larger diameter than the frame portion 6. The arm portion 7 is formed to have a smaller axial dimension than the frame portion 6. The arm portion 7 is formed with shaft holes 7 a and 7 b through which the support shaft 14 is inserted. The arm portion 7 allows the optical member 4 to rotate around the support shaft 14 and in the axial direction of the support shaft 14. It is supported so that it can be displaced.

  The other optical member 9 includes a wide lens 10 having a short focal length, and includes a frame portion 11, an arm portion 12, and a follower portion 13, similar to the optical member 4. Although not shown in the figure, the follower portion 13 is provided with two cam followers (not shown) having a predetermined drop g as in the follower portion 8 of the optical member 4. Note that the wall portion 3 surrounding the periphery of the imaging surface of the imaging element 1 is formed to have a larger diameter than the frame portion 11. The arm portion 12 is formed to have a smaller axial dimension than the frame portion 11. The arm portion 12 is formed with a shaft hole through which the support shaft 14 is inserted, and the arm portion 12 allows the optical member 9 to rotate around the support shaft 14 and to be displaced in the axial direction of the support shaft 14. Supported.

  The optical members 4 and 9 are connected by a known elastic member 17 such as a spring, and are urged so that the optical members 4 and 9 approach each other along the axial direction of the support shaft 14.

  In the present embodiment, as described below, the position of the optical members 4 and 9 is regulated in the direction along the support shaft 14 by the operation member 18.

  The operating member 18 is a cam member that is rotationally driven by the driving means 32, and the cam member 18 has two cam portions (corresponding to the optical members 4 and 9) on the upper and lower sides in the direction along the support shaft 14. Upper cam portion and lower cam portion) 19, 28. Accordingly, the two optical members 4 and 9 can be operated by the single cam member 18. That is, the followers 8 and 13 of the optical members 4 and 9 are in contact with the cams 19 and 28, respectively.

  The cam member 18 is rotationally driven by known driving means 32 such as a step motor via a gear (not shown) provided at the lower end, and the support shaft 18a is provided along the direction of the optical axis. Further, the cam member 18 is driven counterclockwise as viewed from above, but is not limited thereto, and may be driven clockwise, and the rotation direction can be appropriately changed. May be. The cam portions 19 and 28 have substantially the same shape in relation to the follower portions 8 and 13 that abut against the cam portions 19 and 28, and each has a phase that is approximately half a cycle with respect to the support shaft 18a. It is formed at a shifted position. The relationship between the shape and arrangement of the cam portions 19 and 28 can take any form independently depending on the optical design of the tele lens 5 and the wide lens 10.

  The upper cam portion 19 is formed around the support shaft 18a of the cam member 18, and as shown in FIGS. 1A to 1C, the first cam surface 20 for retracting the optical member 4 to the retracted position. A second cam surface 22 for adjusting the focus of the optical member 4 at the optical axis position, and a third cam surface 36 for regulating the position along the support shaft 14 at the retracted position of the optical member 4; The third cam surface 36 has a predetermined drop g with respect to the second cam surface 22 at the transition portion from the second cam surface 22 as shown in FIG. In FIGS. 1A to 1C, reference numeral 18b denotes a shaft hole through which the support shaft 18a is inserted.

  The first cam surface 20 is formed on the outer peripheral surface in the direction along the support shaft 18a of the large-diameter portion 20A having a small-diameter relief portion 21 and having a large diameter with a predetermined curvature radius, and the second cam surface 22 Is formed along the circumferential direction on a plane that is spaced radially outward of the support shaft 18a from the escape portion 21 and intersects the support shaft 18a, and has a flat portion 26, an inclined portion 23, and flat portions 27a and 27b. The third cam surface 36 extends on the plane that intersects the support shaft 18a so as to extend radially outward from the portion of the escape portion 21 near the support shaft 18a and surround the outer periphery of the large-diameter portion 20A. It is formed in a flat shape so as to face the cam surface 22.

  The flat portion 26 of the second cam surface 22 is set to have a constant height in the direction of the support shaft 18a, and its upstream side is connected to a transition portion 36b that falls in a wall shape at the upstream end of the third cam surface 36, The downstream side is connected to the ascending slope 24. The ascending slope 24 is connected to the descending slope 25 via the apex m. The ascending slope 24, the apex m, and the descending slope 25 constitute an inclined portion 23 of the present invention whose height changes in a direction along the support shaft 18a.

  The downstream side of the downward slope 25 is connected to the flat portion 27a, the downstream side of the flat portion 27a is connected to the flat portion 27b via the upward inclined portion n, and the downstream side of the flat portion 27b is the third cam surface. 36 is connected to the introduction side transition portion 36a with a drop g.

  The lower cam portion 28 includes a first cam surface 29, a relief portion 30, a second cam surface 31, and a third cam surface 38, and their positional relationship is the same as that of the upper cam portion 19. Is set to

  In the transition part 36a from the second cam surface 22 to the third cam surface 36, a head smaller than a predetermined head g may be set. Further, a drop larger than a predetermined drop g may be set in the transition portion 36b from the third cam surface 36 to the second cam surface 22. In this way, the follower portion 8 can smoothly transition between the second cam surface 22 and the third cam surface 36.

  3A, 3B, 4A, and 4B show the correspondence between the follower portion 8 of the optical member 4 and the cam member 18, and FIGS. 3A and 4A show the follower. In the state where the portion 8 is in urging contact with the second cam surface 22 and the optical member 4 is at the optical axis position (see FIG. 6), FIG. 3 (B) and FIG. A state in which the optical member 4 is in the retracted position by being urged and brought into contact with the one cam surface 20 and the third cam surface 36 (see FIG. 5) is shown.

  Each optical member 4, 9 rotates in a direction away from the optical axis position, that is, in a retracted position when each follower portion 8, 13 comes into contact with the corresponding first cam surface 20, 29. The follower portions 8 and 13 also come into contact with the third cam surfaces 36 and 38, and the position of the optical members 4 and 9 in the direction along the support shaft 14 is regulated. In short, regardless of whether each optical member 4, 9 is in the optical axis position or in the retracted position, each follower portion 8, 13 is moved to the second cam surface 22, 31 or the third cam surface by the elastic member 17, respectively. Since the optical members 4 and 9 are biased and abutted on 36 and 38, the positions of the optical members 4 and 9 in the direction along the support shaft 14 are maintained.

  Next, the operation of the optical members 4 and 9 by the camera module having such a configuration will be described with reference to FIGS. First, in the state shown in FIG. 7A, the optical member 4 having the tele lens 5 is in the retracted position, and the optical member 9 having the wide lens 10 is in the optical axis position. Next, when the lenses 5 and 10 are switched as an operation for changing the magnification, the state shown in FIG. That is, the optical member 4 is disposed at the optical axis position, and the optical member 9 is disposed at the retracted position.

  Then, as a focus adjustment operation, the optical member 4 having the tele lens 5 is displaced on the optical axis to the subject side, and the state shown in FIG. At this time, as described above, since the frame portion 6 of the optical member 4 has a smaller diameter than the shooting hole 34 and the frame portion 6 protrudes from the arm portion 7, the optical member 4 has the frame portion 6. Can be displaced to a position where it enters the shooting hole 34.

  On the other hand, when the wide lens 10 performs the focus adjustment operation, the optical member 9 having the wide lens 10 is displaced from the state shown in FIG. The state shown in D) is obtained. At this time, as described above, the frame portion 11 of the optical member 9 has a smaller diameter than the wall portion 3 that surrounds the periphery of the imaging surface 2 of the imaging element 1, and the frame portion 11 protrudes from the arm portion 12. Therefore, the optical member 9 can be displaced to a position where the frame portion 11 enters the inside of the wall portion 3.

  Next, the operation of the cam member 18 for operating the optical members 4 and 9 as described above will be described with reference to FIG. 8 showing the development of the cam surface and other drawings. For convenience, the upper cam portion 19 is taken as an example, and the position where the follower portion 8 moves from the first cam surface 20 and the third cam surface 36 to the second cam surface will be described as 0 ° (reference point).

  First, at 0 °, the optical member 4 is at the end of the retracted position, the side portion of the follower portion 8 is urged against the first cam surface 20, and the cam follower 8 b is urged against the third cam surface 36. The position of the optical member 4 in the direction along the support shaft 14 is restricted, and contact interference with other members is prevented (state shown in FIG. 7A).

  When the cam member 18 rotates counterclockwise from the 0 ° position, the side portion of the follower portion 8 is disengaged from the first cam surface 20, and the cam follower 8b is separated from the third cam surface 36, and the cam follower 8a. Comes in contact with the flat portion 26 and the follower portion 8 is displaced radially inward, and accordingly, the tele lens 5 is displaced so as to approach the optical axis. Then, within about 60 ° from the start of rotation of the cam member 18, the follower portion 8 changes its direction, the tele lens 5 is inserted on the optical axis, and the optical member 4 is in the optical axis position (FIG. 7 ( B)).

  When the cam member 18 further rotates counterclockwise, the cam follower 8a reaches the ascending slope 24 of the second cam surface 22 and rises to the top m along the ascending slope 24 over an angle range of about 90 ° (FIG. 7 (C) state). The top is at an angular position of about 150 °.

  Then, the cam follower 8a of the follower portion 8 reaches the steep slope 25 of the second cam surface 22 and descends along the down slope 25 over an angle range of about 30 °, and is a flat portion 27 at an angle position of about 180 °. (The state shown in FIGS. 6 and 7B). The focus adjustment is performed either while the follower unit 8 rises along the uphill slope 24 or while the follower section 8 falls down along the downhill slope 25.

  Further, the cam follower 8a of the follower portion 8 is displaced radially outward on the flat portion 27 over an angular range of about 60 °, and accordingly, the tele lens 5 is displaced so as to be separated from the optical axis. To do. Further, the cam follower 8a of the follower portion 8 is in contact with an end surface that defines the end of the second cam surface 22, and receives a force acting radially outward with the edge of the end surface as a fulcrum.

  At that time, when the cam follower 8b of the follower portion 8 comes into urging contact with the transition portion 36a of the third cam surface 36, the follower portion 8 changes its direction, and the follower portion 8 is attached to the first cam surface 20. The cam follower 8b moves to the third cam surface 36 formed on the outer periphery of the large-diameter portion 20A, the tele lens 5 is detached from the optical axis, and the optical member 4 returns to the retracted position (see FIGS. 5 and 5). 7 (A) state).

  At this time, the follower portion 8 is at an angular position of about 240 ° and abuts against the first cam surface 20, and the cam follower 8 b abuts against the third cam surface 36, thereby restricting the position of the optical member 4. After that, the follower portion 8 abuts on the first cam surface 20 and the third cam surface 36 over an angle range of about 120 ° to the 0 ° angle position, and the position of the optical member 4 is regulated. The state moves to the retracted position.

  As described above, since the drop g is set between the third cam surface 36 and the second cam surface 22, the drop g is set between the cam follower 8a and the cam follower 8b. When shifting from the second cam surface 22 to the third cam surface 36 (and the first cam surface 20), the height level of the follower portion 8 in the direction of the support shaft 14 does not change. It should be noted that when the follower portion 8 moves from the second cam surface 22 to the third cam surface 36 (and the first cam surface 20), the height level of the follower portion 8 in the direction of the support shaft 14 is slightly changed. Also good. That is, the drop g between the second cam surface 22 and the third cam surface 36 and the drop between the cam follower 8a and the cam follower 8b may be appropriately changed.

  In addition, since the cam follower 8a that contacts the second cam surface 22 and the cam follower 8b that contacts the third cam surface 36 are provided separately, the correspondence relationship between the cam surface and the cam follower is clarified in terms of configuration. It is possible to prevent the occurrence of confusion (mutual interference) between the surface and the cam follower. If the correspondence between the cam surface and the cam follower can be clarified structurally, the third cam surface 36 is formed flat at the same level as the flat portion 27 of the second cam surface 22 (without providing a drop). May be.

  As described above, the other lower cam portion 28 has the same shape as the upper cam portion 19 with a phase shifted by a half cycle. Therefore, for example, when the optical member 4 is at the optical axis position and the follower portion 8 abuts on the inclined portion 23 of the second cam surface 22, the follower portion 13 of the optical member 9 is the second cam portion 28. It is in contact with one cam surface, that is, the optical member 9 is in the retracted position.

  As described above, according to the camera module according to the present embodiment, in addition to the magnification changing function and the focus adjusting function, the camera module has a retreat function with the position restriction of the optical members 4 and 9, but these functions are integrated. By realizing this driving means, the camera module can be significantly reduced in size.

  Further, since the optical member 4 can be displaced along the optical axis so that a part of the optical member 4 enters the photographing hole 34 in a state where the tele lens 5 is positioned on the optical axis, the focus adjustment is performed. It is possible to reduce the thickness of the housing while securing an effective region in which the optical member 4 can be displaced for the purpose.

  Further, when a part of the optical member 9 enters the inside of the wall portion 3, the space between the wide lens 10 and the imaging surface 2 is surrounded by the frame portion 11 and the wall portion 3, and dust or The disturbance light can be effectively blocked. In addition, since the optical member 9 can be displaced along the optical axis so that a part of the optical member 9 enters the inside of the wall portion 3 in a state where the wide lens 10 is positioned on the optical axis, focus adjustment is performed. Therefore, it is possible to reduce the thickness of the housing while securing an effective region in which the optical member 9 can be displaced for the purpose of the above.

  By the way, in the camera module, a plurality of optical systems having different focal lengths can be configured on the optical axis by one lens or a combination of a plurality of lenses positioned on the optical axis, and optical magnifications are discretely different. A plurality of images can be obtained, but by using the digital zoom together, an image having a continuously changing magnification can be obtained based on the image obtained by the optical system.

  Specifically, when the region of the enlarged image obtained by processing the reference image by the short focal length side optical system is equivalent to the region of the reference image by the long focal length side optical system, the long focal length side optical Position control of the optical member is performed so that the system is in a state of being interposed on the optical axis. Each optical system may be composed of a single lens or may be composed of a combination of a plurality of lenses. In this case, the focal length of the optical system is the combined focal length of each lens.

  Below, based on FIG. 9, a camera including a tele lens 5 having an optical magnification of 2.5 as an optical system on the long focal length side and a wide lens 10 having an optical magnification of 1 as an optical system on the short focal length side. In the module, a zoom operation for continuously increasing the magnification is performed, and an image is provided by continuously enlarging the image from 1 × which is the optical magnification of the wide lens 10 to 5 × which is larger than the optical magnification of the tele lens 5. To do. The digital processing and the lens switching processing are performed by an arbitrary arithmetic processing device.

  First, a wide lens 10 is interposed on the optical axis, and a first reference image by the wide lens 10 is obtained. Then, in response to an operation for increasing the magnification, the first reference image is enlarged by digital processing to provide an enlarged image. At this time, the image quality of the provided image has a relationship that decreases as the magnification increases. When the magnification is increased to 2.5, an operation of switching the lens interposed on the optical axis from the wide lens 10 to the tele lens 5 is performed.

  When the second reference image obtained by the tele lens 5 is obtained, the enlarged image enlarged up to 2.5 times is replaced with the second reference image. By this processing, the image quality of the provided image becomes comparable to that of the first reference image. At this time, the image providing area of the enlarged image and the area of the second reference image are the same. When an operation for further increasing the magnification is performed, the second reference image is enlarged by digital processing to provide an enlarged image. At this time, as before, the image quality of the provided image has a relationship of decreasing as the magnification increases.

  In this way, when the zoom operation is performed, the image quality can be improved by changing the optical system when the magnification required for the zoom operation becomes the magnification of the optical system on the long focal length side. Thus, it is possible to provide an image with an arbitrary magnification while suitably maintaining the image quality over a wide magnification range. The camera module according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, as shown in FIG. 10, the imaging element 1 may have a configuration in which the imaging surface 2 is closed by a fixing member 35 having a transparent portion disposed at least on the optical axis. In this way, dust and disturbance light can be effectively blocked. In this case, the fixing member 35 is a member including a lens, and particularly preferably a member including a standard lens or a wide-angle lens.

  In the above embodiment, the cam member 18 has been described as having the two cam portions 19 and 28 formed at positions where the phase is shifted by a half cycle. However, the degree of shifting the phase and the cam portion provided. The number and the shape of the cam portion are not limited to this. And the cam member which a camera module has is not limited to one, A plurality may be sufficient as long as it is each rotationally driven by one drive means. In the present invention, the camera module has two optical members. However, the camera module may have only one optical member.

  The camera module according to the present invention has a magnification change function and a focus adjustment function, and can achieve downsizing, and the occurrence of troubles such as contact interference of optical members is reduced, so the mode conversion function is sound. It is suitable for the field of mobile terminal devices such as mobile phones and PDAs.

(A), (B), and (C) are perspective views of an operation member of a camera module according to an embodiment of the present invention. Perspective view of the optical member (A) is a plane corresponding view of the optical member and the operating member at the same optical axis position, (B) is a plane corresponding view of the optical member and the operating member at the same retracted position. (A) is a perspective view corresponding to the optical member and the operation member at the same optical axis position, (B) is a perspective view corresponding to the optical member and the operation member at the same retracted position. The perspective view which shows the internal structure of the camera module in the state which has the optical member in a retracted position The perspective view which shows the internal structure of the camera module in the state in which the optical member exists in an optical axis position FIG. 2 is a schematic cross-sectional view illustrating the operation of the camera module according to the embodiment, in which (A) is a cross-sectional view illustrating a state in which the optical member on the imaging element side is in the retracted position and the optical member on the subject side is in the optical axis position; (B) is a cross-sectional view showing a state in which the optical member on the imaging element side is at the optical axis position and the optical member on the subject side is in the retracted position, and (C) is a state in which the optical member on the imaging element side is at the optical axis position. Sectional drawing which shows the state in which a part of optical member has entered into the hole for imaging | photography, (D) is a to-be-photographed object's optical member in an optical axis position, and a part of this optical member has entered the inside of a wall part Sectional view showing the condition Operation explanatory diagram of the optical member of the camera module according to the embodiment Relationship diagram between image quality and magnification of an image shot using the camera module according to the embodiment 2A and 2B are schematic cross-sectional views of the camera module according to the embodiment, in which FIG. 1A is a cross-sectional view illustrating a camera module including a fixing member that closes an imaging surface and two optical members that can be displaced, and FIG. Sectional drawing of a camera module provided with the fixing member which obstruct | occludes, and one optical member which can be displaced

Explanation of symbols

5, 10 ... lenses 4, 9 ... optical members 8a, 8b ... cam followers 14, 18a ... support shaft 18 ... operating members 19, 28 ... cam portion 20 ... first cam surface 20A ... large diameter portion 21 ... relief portion 22 ... Second cam surface 32 ... Driving means 36 ... Third cam surfaces 36a, 36b ... Transition part g ... Drop

Claims (5)

A plurality of optical members which are provided with lenses having different optical characteristics and are supported so as to be displaceable in a direction along the optical axis and in a direction crossing the optical axis, from the optical axis position corresponding to the optical axis and the optical axis. A camera module in which the operation members that are displaced independently from each other in the retracted retraction position are driven by a single drive means,
The operating member is configured to adjust the focus of the optical member at the optical axis position and a first cam surface formed in a plane along the support shaft of the operating member to retract the optical member to the retracted position. And a second cam surface formed in a plane intersecting the support shaft, and the support around the first cam surface for restricting the optical member in a direction along the support shaft at the retracted position. And a third cam surface formed in a plane intersecting the axis.   The first cam surface is formed on an outer peripheral surface of a large-diameter portion having a small-diameter relief portion and formed into a large diameter, and the second cam surface is radially outward of the support shaft from the relief portion. And the third cam surface extends radially outward from a portion of the relief portion near the support shaft in a circumferential direction in a plane intersecting the support shaft. The camera module according to claim 1, wherein the camera module is formed flat so as to surround an outer periphery of the large-diameter portion. A cam follower that contacts the third cam surface and a cam follower that contacts the second cam surface are provided on each of the optical members, and the contact surface of the cam follower that contacts the third cam surface and the A predetermined head is set between the contact surface of the cam follower that contacts the second cam surface,
The third cam surface is disposed so as to face the second cam surface across the support shaft, and between the third cam surface and the second cam surface at the facing portion. The camera module according to claim 1, wherein a head corresponding to the predetermined head is set. A cam follower that contacts the third cam surface and a cam follower that contacts the second cam surface are provided on each of the optical members, and the contact surface of the cam follower that contacts the third cam surface and the A predetermined head is set between the contact surface of the cam follower that contacts the second cam surface,
The third cam surface is disposed so as to face the second cam surface across the support shaft, and between the third cam surface and the second cam surface at the facing portion. In the transition portion from the second cam surface to the third cam surface, a head smaller than the predetermined head is set, and in the transition portion from the third cam surface to the second cam surface, the predetermined head The camera module according to claim 1, wherein a larger head is set. 5. The camera module according to claim 3, wherein a contact surface of the cam follower that contacts the second cam surface and a contact surface of the cam follower that contacts the third cam surface are formed in a curved shape. .

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