WO2004036281A1 - レンズ駆動装置 - Google Patents
レンズ駆動装置 Download PDFInfo
- Publication number
- WO2004036281A1 WO2004036281A1 PCT/JP2003/013369 JP0313369W WO2004036281A1 WO 2004036281 A1 WO2004036281 A1 WO 2004036281A1 JP 0313369 W JP0313369 W JP 0313369W WO 2004036281 A1 WO2004036281 A1 WO 2004036281A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lens
- lens support
- lens group
- support member
- driving device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
- G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
Definitions
- the present invention relates to a lens driving device that moves a lens to perform optical zoom and focus, and a lens drive device that moves a lens to perform optical zoom, macro and focus operations, and is particularly applied to a micro camera. Therefore, the present invention relates to improvement of driving operation in a lens having a simplified lens configuration.
- Such an optical zoom function is usually performed by appropriately moving two or more lens groups in the optical axis direction, thereby obtaining a desired zoom and performing focusing (focusing) according to the zoom.
- an independent actuator for each of two lenses.
- Another method is disclosed in
- Patent Document 2 JP-A-5-22209 (Patent Document 2), a cam is used to control the positional relationship between two lenses (lens groups) for one actuator motor. The zoom and focus are realized in two movements.
- the movement of the lens to achieve optical zoom is complicated, not only in one direction
- lens diameter an optically effective lens diameter
- the position accuracy of the lens will also be strict, requiring high-precision positioning and advanced control.
- Patent Document 3 As a driving device having a zoom function to be mounted on a mobile phone, as disclosed in Japanese Patent Application Laid-Open No. 2002-290523 (Patent Document 3), one actuator (motor) is used. In contrast, some cameras use a cam to control the positional relationship between the two front and rear lenses (group lenses) to achieve zoom.
- the invention disclosed in the above publication is a double-cylinder cam mechanism in which a fixed cylinder for a straight guide slot is arranged around a lens and a force cylinder for transmitting a driving force is arranged outside the fixed cylinder. However, since these are accommodated in the cylindrical main body, there is a problem that the outer size becomes large.
- a desired macro focus can be obtained by appropriately moving the front and rear two group lenses in the optical axis direction, but in this case, the front and rear group lenses and the image sensor Since the relative positional relationship is different from the zoom operation, it is necessary to move each group lens independently to make them compatible. However, if each group lens is moved independently by two factories, the main body becomes large, and it becomes difficult to miniaturize. Also, in order to obtain zoom and macro operation using a cam mechanism, the configuration becomes complicated, and it is also difficult to miniaturize.
- the present invention has been made in view of the above background, and has as its object to solve the above-mentioned problems and to eliminate the need for a complicated mechanism cam, advanced control and a complicated mechanism, and to provide a zoom magnification.
- the object of the present invention is to provide a simple, small, and inexpensive lens driving device by limiting the number of lens driving devices. Still another object is that a single actuator can be used to perform optical zoom, macro, and focus operations to achieve ultra-small external dimensions, and a lens drive device that can be incorporated into mobile phones that are becoming thinner and smaller. Is to provide.
- a lens driving device for moving a lens in a lens unit having an optical zoom function for a micro camera using a lens having a lens diameter of 7 mm or less.
- the first and second lens support members are provided with first and second lens support members disposed in front and rear, respectively, and each of the first and second lens support members holds a predetermined number of lenses.
- the first lens support member is fixed, and the second lens support member is configured to be movable in the front-rear direction and stopped at two desired positions in the front-rear direction.
- the configuration is such that two types of zoom magnifications can be switched.
- the first lens support member is configured to be movable in the front-rear direction and to be stopped at two desired positions in the front-rear direction.
- the two lens support members are configured to be movable in the front-rear direction and to stop at desired two positions in the front-rear direction, and two types are provided by controlling stop positions of the first and second lens support members. You may be able to switch the zoom magnification of.
- the movement of the first lens support member and the second lens support member uses at least one of a solenoid, a relay, and a permanent magnet as an actuator.
- the two types of relative positional relationship may be switched and controlled by moving the two lens support members in conjunction with each other.
- switching control can be realized with a simpler configuration.
- the first lens support member is configured to be movable in the front-rear direction and to be stopped at two desired positions in the front-rear direction
- the second lens support member is configured to be movable in the front-rear direction and to be stopped at three desired positions in the front-rear direction, and to control the stop positions of the first and second lens support members. Is to be able to switch between three types of zoom magnification.
- the second lens support member moves forward and backward by receiving the output of the stepping motor, and the first lens support member moves by the urging force from the second lens support member. It is possible to stop at two positions, the first position in a state where the urging force is not received and the second position moved by the urging force, so that one actuator and a simple power transmission mechanism can be used. You can switch between different zoom factors.
- the present invention is realized, for example, by the thirteenth embodiment.
- the movement with respect to at least one of the first lens support member and the second lens support member can be performed based on an output of a stepping motor.
- the first lens support member is a member that supports the front lens group (the front group support 40, the front group movable body 3, 40 ′, the front lens support 53, the front lens group
- the second lens supporting member is a member that supports the rear lens group (the rear group movable members 4, 30, the rear lens supporting member 54, and the rear lens member).
- the present invention is not limited to this, and may be applied in reverse depending on the operating characteristics indicating the correlation between the zoom magnification and the lens position.
- the number of stop points is limited to two or three. As a result, positioning can be easily performed with a simple and small mechanism, and different zoom magnifications can be exhibited by appropriately setting the stop position according to the operation characteristics.
- the diameter of the lens to be applied is set to 7 mm or less is as follows.
- the area of the camera module is within 13 mm square even at a fixed focal point, and this level has become the upper limit of adoption. Therefore, in order to fix the lens, it is necessary to provide a fixing frame of at least about 1 mm, and the size of the lens module is “lens diameter + 2 mm J.
- the lens diameter must be reduced to 7 mm or less in order to reduce the total size to 13 mm or less.
- ⁇ 7 mm is the upper limit, and preferably ⁇ 5 mm or less. It is not limited to telephones.
- a lens driving device includes a lens for moving a lens in a lens unit having an optical zoom function for a micro camera using a lens having a lens diameter of 7 mm or less.
- a driving device comprising first and second lens support members arranged in front and back, wherein each of the first and second lens support members holds a predetermined number of lenses. Then, the first lens support member is fixed, the second lens support member is movable in the front-rear direction, and stops at two front and rear fixed positions, and a minute distance is set at the corresponding fixed position.
- the optical zoom and focus operation can be performed by configuring to perform the moving drive. It was configured to be able to.
- the first lens support member corresponds to a member that supports the front lens group (the frame 3, the front group support 40), and the second lens support member is, in the embodiment, This corresponds to the members (the frame 4 and the rear group movable body 30) that support the rear group lens, but the present invention is not limited to this.
- the present invention is not limited to this.
- the operation characteristics indicating the correlation between the zoom magnification and the lens position The opposite is also possible.
- the stop points are limited to two fixed positions and a position moved a small distance based on the fixed positions.
- the positioning can be easily performed with a simple and small mechanism, and different zoom magnifications can be exhibited by appropriately setting the stop position according to the operation characteristics. Therefore, even when only one of the second lens support members is driven, binary zoom operation can be performed.
- the focus can be adjusted and the focusing operation can be performed.
- moving the microscopic distance causes the zoom focal point to gradually move out of focus, and the focus at the very close position will be in focus, enabling macro operation.
- the micro-movement at the fixed position should be performed at every feed pitch of 50 m or less at least in the section of 500 ⁇ m before and after the macro that exists at a very close position. Focus is readily available. When the feed pitch of the fine movement is set to several meters or less, the focus operation becomes easy.
- the driving means uses a stepping motor as a driving source, provides a lead screw on the output shaft, and provides a lead nut at a position corresponding to the support member of the rear lens, and performs a linear operation by coordination between the two.
- a stepping motor since the stepping motor is used, it can be driven in an open loop, and a position detection sensor or the like is not required.
- the stepping motor is a flat type in which a stator is disposed on the left and right sides of a rotor.
- the driving source becomes flat, the thickness of the lens driving device can be significantly reduced, which is advantageous in terms of miniaturization.
- FIG. 1 is a schematic configuration diagram illustrating the concept of each embodiment of the present invention.
- FIG. 2 is an operation characteristic diagram showing a positional relationship between a zoom magnification and a lens group.
- FIG. 3 is an operation characteristic diagram (part 1) showing a positional relationship between a zoom magnification and a lens group for explaining the operation principle of the present invention.
- FIG. 4 is an operation characteristic diagram (part 2) showing a positional relationship between a zoom magnification and a lens group for explaining the operation principle of the present invention.
- FIG. 5 is an operation characteristic diagram (part 3) showing a positional relationship between a zoom magnification and a lens group for explaining the operation principle of the present invention.
- FIG. 6 is an operation characteristic diagram (part 4) showing the positional relationship between the zoom magnification and the lens group for explaining the operation principle of the present invention.
- FIG. 7 is an operation characteristic diagram (part 5) showing the positional relationship between the zoom magnification and the lens group for explaining the operation principle of the present invention.
- FIG. 8 is an exploded perspective view showing the first embodiment of the present invention.
- FIG. 9 is a perspective view showing the first embodiment of the present invention.
- FIG. 10 is a cross-sectional view showing a second embodiment of the present invention.
- FIG. 11 is a cross-sectional view showing a third embodiment of the present invention.
- FIG. 12 is a cross-sectional view showing a fourth embodiment of the present invention.
- FIG. 13 is a cross-sectional view showing a fifth embodiment of the present invention.
- FIG. 14 is a cross-sectional view showing a sixth embodiment of the present invention.
- FIG. 15 is a diagram showing a modification of the coil.
- FIG. 16 is a sectional view showing a seventh embodiment of the present invention.
- FIG. 17 is a sectional view showing a seventh embodiment of the present invention.
- FIG. 18 is a cross-sectional view showing an eighth embodiment of the present invention.
- FIG. 19 is a sectional view showing a ninth embodiment of the present invention.
- FIG. 20 is a sectional view showing a tenth embodiment of the present invention.
- FIG. 21 is a sectional view showing an eleventh embodiment of the present invention.
- FIG. 22 is a diagram showing a 12th embodiment of the present invention.
- FIG. 23 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 24 is a view showing a modification of the 12th embodiment of the present invention.
- FIG. 25 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 26 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 27 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 28 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 29 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 30 is a diagram showing a modification of the 12th embodiment of the present invention.
- FIG. 31 is a view for explaining an example of a driving mechanism of the movable piece in the 12th embodiment of the present invention.
- FIG. 32 is a view for explaining an example of a driving mechanism of the movable piece in the 12th embodiment of the present invention.
- FIG. 33 is a view for explaining an example of a driving mechanism of the movable piece in the 12th embodiment of the present invention.
- FIG. 34 is a view for explaining an example of a driving mechanism of the movable piece in the 12th embodiment of the present invention.
- FIG. 35 is a view for explaining an example of a drive mechanism of the movable piece in the 12th embodiment of the present invention.
- FIG. 36 is a diagram showing a thirteenth embodiment of the present invention.
- FIG. 37 is a diagram showing a thirteenth embodiment of the present invention.
- FIG. 38 is a diagram showing a thirteenth embodiment of the present invention.
- FIG. 39 is a side view for explaining the concept in the 14th embodiment of the present invention.
- FIG. 40 is a characteristic diagram showing a lens position with respect to a zoom magnification in the fourteenth embodiment of the present invention.
- FIG. 41 is a characteristic diagram showing a lens position serving as a macro operation in the fourteenth embodiment of the present invention.
- FIG. 1 is a diagram for explaining the concept of a preferred embodiment of the present invention.
- a front lens group 1 and a rear lens group 2 are arranged along the optical axis L.
- Front lens group 1 with a diameter of about 5 mm and rear lens group The lens group 2 is held in the cylinder 5 via the front group movable body 3 and the rear group movable body 4, respectively.
- both the front lens group 1 and the rear lens group 2 can move in the front-back direction in the cylindrical body 5 because they are movable bodies.
- the front lens group 1 and the rear lens group 2 are inserted and arranged in the cylindrical body 5 for convenience of illustration, but the cylindrical body is not necessarily required depending on the drive mechanism of the front group movable body 3 and the rear group movable body 4. Needless to say, the configuration is appropriate.
- an imaging element 6 such as a CCD is disposed at a predetermined position behind the cylinder 5.
- the imaging device 6 such as a CCD and the like at a desired zoom magnification.
- An image can be formed.
- the output of the image sensor 6 such as the CCD is input to a predetermined image processing device, but the description of the body of the ultra-small camera is omitted since it is not related to the present invention.
- FIG. 1 (a) shows a state where the zoom magnification is 1 ⁇ .
- the relationship between the positions of the two lens groups 1 and 2 and the zoom magnification (in focus) in this micro camera is as shown in FIG. That is, as shown by the solid line in the movement trajectory of the front lens group 1, the zoom magnification is reduced from 1 to (3 ⁇ 4 (for example, 1.5)), and then gradually moved forward. (For example, 2 times) ⁇ ⁇ y times (for example, 2.5 times) In this case, the movement locus of the rear lens group 2 is to increase the zoom magnification from 1 time as shown by the broken line. Gradually move forward.
- FIG. 2 The positional relationship between the front lens group 1 and the rear lens group 2 when the zoom magnification is ⁇ times, ⁇ times, and ⁇ times from the 1 ⁇ standard state shown in FIG. 1 (a) is shown in FIG. ) To (d). Note that the characteristic diagram shown in FIG. 2 is variously changed depending on the lens and other mechanisms used.
- the movement trajectory of the front lens group 1 from the zoom magnification of 1 to ⁇ times moves forward and backward after moving backward.
- the front lens group 1 is fixed (the front group movable body 3 is merely a holder), and the position of the rear lens group 2 is set as a reference (1).
- a lens driving device for micro cameras that can obtain multiple zoom magnifications as follows is realized. can do.
- the front lens group 1 is reciprocated so as to stop at the two positions of the reference position A and the retreat position B, and the rear lens group 2 stops at the two positions of the reference position (1) and the front position (2).
- the reference position (FIG. 1 (a)) where the zoom magnification is 1 and the zoom magnification are ⁇ times (FIG. 1 (b)) )
- a mechanism for driving each of the front lens group 1 and the rear lens group 2 is required, but since it is only necessary to reciprocally move the two positions together, each drive mechanism can be simplified and control is also simplified. It can be miniaturized, and can be used as a lens drive device for micro cameras.
- the front lens group 1 is reciprocated so as to stop at the two positions of the reference position A and the advance position C, and the rear lens group 2 is moved to the two positions of the reference position (1) and the foremost position (4).
- a lens driving device that takes In this example as well, a mechanism for driving each of the front lens group 1 and the rear lens group 2 is required, but it is only necessary to reciprocate the two positions for both, so that each drive mechanism can be simplified and the control can be performed.
- the front lens group 1 is reciprocated so as to stop at two positions, the reference position A and the retreat position B, and the rear lens group 2 is moved between the reference position (1) and the two front positions (2) and (3). Move to stop at a total of three positions.
- the reference position (Fig. 1 (a)) where the zoom magnification is 1 and the zoom magnification ⁇ times (Fig. 1 (b))
- a lens driving device having three types of zoom magnifications of 3 times (FIG. 1 (c)) can be realized.
- the front lens group 1 reciprocates so that the front lens group 1 stops at the two positions of the reference position A and the advance position C, and the rear lens group 2 moves to the reference position (1) and the two front positions. Move so that it stops at a total of three positions, positions (3) and (4).
- the reference position (FIG. 1 (a)) where the zoom magnification is 1 and the zoom magnification are doubled (FIG. 1 (c.)).
- a lens drive device with three zoom magnifications, ⁇ times Fig. 1 (d)).
- FIG. 8 and FIG. 9 show the first embodiment.
- the front lens group is fixed, and a motor is used as an actuator.
- FIG. 8 is a split perspective view
- FIG. 9 (a) is a perspective view showing a basic posture (zoom magnification is 1)
- FIG. 9 (b) is a state where the zoom magnification is double (2 times).
- FIG. 8 is a split perspective view
- FIG. 9 (a) is a perspective view showing a basic posture (zoom magnification is 1)
- FIG. 9 (b) is a state where the zoom magnification is double (2 times).
- the flat rectangular base 10 has a high step portion 11 on the front surface obtained by raising the area of about 1 Z 4 including one corner, and a low step of the remaining area. Part 12 is formed. Small holes 13 are formed in three of the four corners of the high step portion 11, and a large diameter through hole 14 is formed in the center. The center of the through hole 14 is the optical axis, and although not shown, an image sensor such as a CCD is disposed at a predetermined position behind the through hole 14.
- a small stepping motor 20 is provided on the upper surface of the low step portion 12.
- the stepping motor 20 has a case main body 21 that is substantially arcuately curved so as to follow the planar shape of the low step portion 12, and has an output shaft 22 protruding to the outside at the center thereof.
- a rotor is arranged in the center of the case
- a force shaft 22 is inserted into the center of the rotor and integrated.
- stators are arranged on both sides of the case body 21 which are spread left and right.
- the stepping motor having such a configuration for example, those disclosed in Japanese Patent Application Laid-Open No. HEI 6-1055882 and Japanese Patent Application Laid-Open No. H6-192658 can be used. .
- the small-sized stepping motor is not limited to the one having such a configuration, and it is needless to say that various types of motors can be used.
- the distal end of the output shaft 22 is threaded to form a lead screw.
- the rear group movable body 30 is movably inserted into the guide pin 15.
- the rear group movable body 30 has substantially the same planar shape as the base 10, and has a guide hole 31 penetrating therethrough at a position facing the hole 13 of the base 10, and a through hole of the base 10.
- a through hole 32 is provided at a position facing 14.
- the guide bin 15 is inserted and arranged in the guide hole 31, whereby the rear group movable body 30 supported by the three guide bins 15 moves along the guide bin 15 in a stable posture. It is possible to move forward and backward. Further, a rear lens group (not shown) (not shown) is mounted in the through hole 32.
- the rear lens group also moves forward and backward with the forward and backward movement of the rear group movable body 30.
- the stepping motor 20 is sandwiched between the rear movable group 30 and the base 10.
- a through hole 34 is formed in a portion of the rear group movable body 30 facing the output shaft 22 of the stepping motor 20, and a through hole 34 on the front side of the rear group movable body 30 is formed.
- a rectangular recess 35 is formed around the periphery.
- the lead nut 36 is inserted and fixed in the recess 35.
- the lead nut 36 engages with the lead screw provided on the output shaft 22 of the stepping motor 20, and the lead nut 36, and consequently, the rear group movable body 30 moves forward and backward with the forward and reverse rotation of the output shaft 22.
- a front group supporter 40 for supporting the front lens group is attached to the tip of each guide bin 15.
- a through hole 41 is provided at the center of the front group support body 40, that is, at a position facing the through holes 14 and 32 provided in the base 10 and the rear group movable body 30.
- the front lens group is inserted and arranged in the through hole 41.
- a spacer 43 is inserted and arranged in each guide pin 15.
- the thickness of the spacer 43 is such that the distance between the front lens group and the rear lens group when the front group support body 40 and the rear group movable body 30 are in contact via the spacer 43 is:
- the distance dl (see FIG. 3) between the reference position A of the front lens group and the forward position (3) of the rear lens group is set.
- the rear lens group is adjusted to be located at the reference position (1) in a state where the output shaft 22 of the stepping motor 20 is rotated in the reverse direction to move the rear group movable body 30 most backward. I have.
- the length of the guide bin 15 is adjusted so that the position of the front lens group is also at the reference position A.
- the base 10 is 1 lmm square.
- the inner diameter of the through holes 32, 41 that is, the diameter of the rear lens group and the front lens group, is 5 mm.
- the height of the entire apparatus (the distance from the bottom surface of the base 10 to the front surface of the front group support 40) is set to about 11 mm. As a result, it can be sufficiently mounted on a mobile phone.
- the area of the camera module is within 13 mm square even with a fixed focus. If this level is the upper limit of adoption, it will be possible to use a slightly larger lens.
- the total size (planar shape of the base 10) is less than 13 mm square up to a lens diameter of about 7 mm. Can be suppressed. Of course, using smaller lenses does not prevent further miniaturization as a whole.
- the zoom magnification can be set to 1x.
- the output shaft 22 of the stepping motor 20 is rotated forward to move the rear group movable body 30 forward, and as shown in FIG. 9 (b), the front surface of the rear group movable body 30 is
- the zoom magnification can be increased by 3 times (for example, 2 times) by touching the laser 43. Since the stepping motor 20 is used as the actuator, the position of the rear group movable body 30 can be accurately controlled by controlling the number of steps. However, in the present embodiment, the rear group movable body 30 is It is only necessary to stop at two positions, a position that contacts the base 10 and a position that contacts the spacer 43. Since both stop positions contact other members, the rotation speed (step Positioning can be performed accurately even if the control in (2) is relatively rough.
- FIG. 10 shows a second embodiment of the present invention.
- a solenoid is used as an actuator.
- a front lens group 51 and a rear lens group 52 are respectively provided in a pobin 50 serving as a cylindrical body with a front lens support 53 and a rear lens support 54. Attached so that it can move in the axial direction via.
- the inner surface of the bobbin 5 ⁇ was processed with Teflon (registered trademark), the pobin 50 was formed using a resin with a low coefficient of friction, or another cylinder with at least the inner surface mirror-finished was inserted.
- Teflon registered trademark
- the coefficient of friction between the outer surface of the front lens support 53 and the outer surface of the rear lens support 54 may be reduced so as to smoothly move forward and backward.
- the front lens support 53 and the rear lens support 54 have a compression coil panel 55 inserted between them, and are constantly urged away from each other by the elastic restoring force of the compression coil spring 55. Is done.
- positioning stoppers 56 that allow the front lens support 53 and the rear lens support 54 to come into contact are mounted.
- the front lens support 53 and the rear lens support 54 urged by the compression coil spring 55 come into contact with the corresponding positioning stoppers 56 and stop (see FIG. 10 (a)).
- the CCD is arranged at a predetermined position behind the pobin 50 (on the side of the rear lens support 54). At this time, the dimensions are set so that the zoom magnification becomes 1. ing.
- the front lens support 53 and the rear lens support 54 are each manufactured by a permanent magnet (the magnetization direction is leftward in the figure), and the positioning stopper 56 is formed of a non-magnetic material. To be manufactured. Furthermore, a center positioning stopper 57 made of a magnetic material is arranged at an intermediate position inside the bobbin 50, and a coil 58 is mounted on the outer periphery of the bobbin 50. The axial length of the center positioning stopper 57 is determined by the distance d 2 (FIG. 4) between the retreat position B of the front lens group and the forward position (2) of the rear lens group. See).
- the zoom magnification can be set to 1.
- the zoom magnification can be doubled (for example, 1.5 times).
- the electromagnetic force generated by energizing the coil 58 is set so as to exert a force exceeding the elastic restoring force of the compression coil spring 55.
- the front lens support 53 and the rear lens support 54 are composed of permanent magnets, and are attracted to the center positioning stopper 57 made of a magnetic material. Therefore, even if the power is turned off, the state is maintained.
- the electromagnetic force generated by the current is reversed, and the front lens support 53 and the rear lens are synergistically generated with the elastic restoring force of the compression coil panel 55. Acts in the direction to separate the support 54, and returns to the basic posture where the zoom magnification is 1 as shown in FIG. 10 (a).
- the solenoid is used as the actuator, it can be made compact and simple, and the two positions where the zoom magnification is 1 and ⁇ times can be precisely performed by the positioning stopper 56 and the center positioning stopper 57.
- FIG. 11 shows a third embodiment of the present invention.
- This embodiment is based on the above-described second embodiment, and is different in that the center positioning stopper 57 'is made of a permanent magnet.
- the direction of magnetization of this permanent magnet (the direction of the arrow in the figure) is leftward in the figure, and coincides with the direction of magnetization of the permanent magnets forming the front lens support 53 and the rear lens support 54.
- the other configuration is the same as that of the second embodiment.
- Fig. 11 (a) As described above, the front lens support 53 and the rear lens support 54 are respectively urged in the separating directions by the elastic restoring force of the compression coil spring 55, and the basic posture in contact with the positioning stopper 56 installed outside. It becomes.
- the zoom magnification can be set to 1. From this state, as shown in FIG. 11 (b), when the coil 58 is energized to the left in the figure, the front lens support 53 and the rear lens support 54 are centered on each other. Then, when it approaches to a certain extent, the magnetic attraction force with the central positioning stopper 57 'made of a permanent magnet also acts, and it is quickly and surely attracted and held to the central positioning stopper 5T. As a result, the zoom magnification can be increased by a times (for example, 1.5 times). Thereafter, even if the energization of the coil 58 is turned off, the front lens support 53 and the rear lens support 54 both become stronger due to the magnetic attraction generated between the center positioning stopper 57 ′. Fixed. Therefore, for example, when mounted on a mobile phone, it is difficult to hold it in a fixed state compared to a digital camera, etc. Therefore, a state where the zoom magnification is ⁇ times can be stably maintained.
- FIG. 11 (a) shows an embodiment of FIG. This embodiment is based on the above-described second embodiment, and the mounting position of the compression coil panel 55 is different. That is, the compression coil springs 55 'are separately attached to the front lens support 53 and the rear lens support 54, respectively.
- the compression coil panel 55 ' is installed outside the bobbin 50, and is set so that the front lens support 53 and the rear lens support 54 are always pushed to the center. That is, in the state shown in FIG. 12 (a), the compression coil panel 55 'is compressed and deformed. Further, contrary to the second embodiment, the positioning stoppers 56 provided at both ends of the pobin 50 are formed of a magnetic material, and the center positioning stopper 57 "is formed of a non-magnetic material.
- the front lens support made of a permanent magnet is provided.
- Each of the rear lens support 53 and the rear lens support 54 has a basic posture of a zoom magnification of 1 in a state where it is magnetically attracted and fixed to a positioning stopper 56 ′ made of a magnetic material.
- the electromagnetic force generated by energization and the elastic restoring force of the compression coil panel 55 ′ make contact with the center positioning stopper 57 ⁇ to be positioned and fixed. This allows the zoom magnification to be set to ⁇ times. Even if the power is turned off in this state, the front lens support 53 and the rear lens support 54 maintain the illustrated state by the elastic restoring force of the compression coil spring 55.
- the front lens support 53 and the rear lens support 54 move away from each other, and as shown in FIG. 12 (a). It returns to the basic posture shown. After this return, even if the power is turned off, the permanent magnets that make up the front lens support 53 and the rear lens support 54 adhere to the positioning stopper 56 ′ made of magnetic material. Hold. Since the other components, arrangements, and operational effects are the same as those of the above-described embodiments, corresponding members are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the outer positioning stopper may be made of a non-magnetic material, and the center positioning stopper may be made of a magnetic material or a permanent magnet.
- the two compression coil springs 5 5 ′ are set so that the front lens support 53 and the rear lens support 54 are always pulled outward.
- two types of zoom magnifications of 1 and ⁇ can be obtained by the same energization processing as in the above-described embodiment.
- the front lens support 53 is fixed to one end of the bobbin 50, and the power is appropriately supplied in a predetermined direction, so that the zoom position as the basic posture is obtained. It goes without saying that a lens driving device capable of switching between two states of magnification of 1 ⁇ and i3 ⁇ can be used.
- FIG. 13 shows a fifth embodiment of the present invention.
- a solenoid is used as an actuator similarly to the second to fourth embodiments described above.
- this lens drive device realizes the operation characteristics shown in Fig. 5 and can take two types of zoom magnifications, 1x and ⁇ x.
- the basic configuration of the device is the same as that of the second embodiment shown in FIG. 10, and the positioning stopper 56 disposed outside the bobbin 50 is made of a non-magnetic material and has a central positioning stopper 5. 7 is made of a magnetic material. Further, the front lens support 53 and the rear lens support 54 are connected to both ends of a compression coil panel 55 disposed so as to be interposed therebetween, and are separated by the elastic restoring force of the compression coil panel 55. Biased in the direction.
- the permanent magnets constituting the front lens support 53 and the rear lens support 54 are arranged such that the magnetizing directions (directions of arrows in the figure) are directed toward the center.
- both the front lens support 53 and the rear lens support 54 move forward (left side in the figure), and as shown in FIG.
- the lens support 54 is magnetically attracted to the center positioning stopper 57, and the front lens support 53 is held against the positioning stopper 56 by the elastic restoring force of the compression coil spring 55.
- the front lens support 53 and the rear lens support 54 can move forward from the reference position shown in FIG. 13 (a), and the amount of movement can be reduced by the center positioning stopper 57.
- the length and installation position of the two they can be the same or different. Therefore, as shown in FIG.
- the zoom magnification can be set to ⁇ times.If the power is turned off, the zoom magnification remains at 0 / times. . When power is supplied in the opposite direction, the zoom position returns to the basic position shown in Fig. 13 (a) with a zoom magnification of 1x. Therefore, in the present embodiment, it is possible to configure a lens driving device that can obtain two kinds of zoom magnifications of 1 ⁇ and ⁇ ⁇ based on the operation characteristics shown in FIG. Since other configurations, functions, and effects are the same as those of the above-described embodiments, corresponding members are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 14 shows a sixth embodiment of the present invention.
- two compression coil panels 55 ' are provided similarly to the fourth embodiment, each of which has a front lens support 53 and a rear lens support 54. Are urged in predetermined directions.
- the central positioning stopper 57 " is made of a non-magnetic material, and the positioning stoppers 56 'on both sides are made of a magnetic material. Further, the front lens support 53 and the rear lens support 54 are formed. The direction of magnetization of the permanent magnet (the direction of the arrow in the figure) is set so as to face forward in the same direction (the direction to the left in the figure) Further, each of the compression coil springs 5 5 ′ has a corresponding lens support 5 3. , 54 are biased toward the center positioning stopper 57 ". However, when the lens supports 53, 54 are magnetically attracted to the positioning stopper 56 ', the elastic restoring force is not strong enough to cancel and separate them. Between the lens supports 53, 54 and the positioning stopper 56 'when the supports 53, 54 are separated from the positioning stopper 56' and abutted against the center positioning stopper, 5 ". It is designed to overcome the generated magnetic attraction.
- the zoom magnification can be set to ⁇ .
- the coils are provided with coils 58a and 58b having different numbers of turns, for example, as shown in Fig. 15 (a), and arranged in the axial direction. Alternatively, as shown in FIG. 15 (b), the number of turns may be changed in the axial direction.
- the position at which the magnetic field is increased is set in consideration of the stop position of the lens support and the like, and is not necessarily at the end.
- FIG. 16 and FIG. 17 show a seventh embodiment of the present invention.
- an electromagnet is used as an actuator. It is of the type (operating characteristics shown in Fig. 4) in which two types of zoom magnification are obtained: 1x and ⁇ x.
- a cylindrical body 63 in which a front lens group 61 and a rear lens group 62 are mounted in a rectangular housing 60 so as to be movable in the axial direction, and an electromagnet 65 are brought close to each other. They are arranged in parallel.
- the inner peripheral surface of the cylindrical body 63 is also formed so as to reduce the frictional force so that the front lens group 61 and the rear lens group 62 can move forward and backward smoothly.
- Cores 65 a are provided at both ends of the electromagnet 65, and the tip of the core 65 a is overlapped with the cylindrical body 63.
- the tip of the core 65a is a portion where the electromagnetic force generated by the electromagnet 65 acts.
- an imaging element 69 such as a CCD is arranged at a rear end portion of the housing 60, and light incident through the front lens group 61 and the rear lens group 62 is incident on the imaging element 69.
- Image image.
- the front lens group 61 and the rear lens group 62 have a configuration including a predetermined number of lenses and a support for supporting the lenses.
- the front lens group 6 1 and the rear lens group 6 2 are always directed toward the center by a compression coil spring 6 4 interposed between spring restraining portions 6 3 a provided at both ends of the cylindrical body 6 3. It is configured to be energized.
- two positioning stoppers 66 and one center positioning stopper 67 are arranged at predetermined positions on a line connecting the ends of the cores 65a provided at both ends of the electromagnet 65, and the front lens group 6 1, Permanent magnets 68 are embedded around the rear lens group 62. More specifically, as shown in FIG.
- the positioning stoppers 66 are formed of a magnetic material and provided at positions close to both cores 65a, respectively.
- the lens group 6 1 and the rear lens group 6 2 stop when they come into contact with each other.
- This state is the basic posture in which each lens group 61 and 62 is located at the reference position, and is set so that the zoom magnification becomes 1.
- the center positioning stopper 67 is formed of a permanent magnet, and its magnetization direction (the direction of the arrow in the figure) is the same as that of the permanent magnet 68 embedded in the front lens group 61 and the rear lens group 62, respectively. (Forward). Then, as shown in FIG. 17 (b), the length of the center positioning stopper 67 and the installation position are adjusted by the front lens group 61 and the rear lens group 62 approaching each other to the center positioning stopper 67. When they hit each other, they are set to the retreat position B and the forward position (2), respectively.
- the compression coil panel 64 is compressed and deformed, and the front lens group 61 and the rear lens group 62 are respectively disposed outside. It is fixed by the magnetic attraction force from the permanent magnet 68 while in contact with the positioning stopper 66. Therefore, the zoom magnification can be set to 1.
- the electromagnet 65 when the electromagnet 65 is energized in this state, a magnetic field as shown in FIG. 17 (b) is generated, and the generated magnetic field is set in the front lens group 61 and the rear lens group 62.
- the girder permanent magnet 68 magnetically repels, separates from the positioning stopper 66, and moves to the center due to the elastic restoring force of the compression coil spring 64. Then, the front lens group 61 and the rear lens group 62 stop while abutting on the center positioning stopper 67. As a result, the zoom magnification can be increased by ⁇ times.
- the power to the electromagnet 65 is turned off by the magnetic attraction generated between the permanent magnet 68 provided in the front lens group 61 and the rear lens group 62 and the central positioning stopper 67 composed of the permanent magnet. Even so, the state shown in FIG. 17 (b) is maintained.
- FIG. 18 shows an eighth embodiment of the present invention.
- This embodiment is based on the seventh embodiment described above, except that the material of the center positioning stopper 67 'is made of a magnetic material, and the other configurations are the same.
- the zoom magnification can be set to 1 in the basic posture shown in FIG. 18 (a), and when the electromagnet 65 is energized as shown in FIG. 18 (b) from that state.
- the permanent magnets 68 provided in the front lens group 61 and the rear lens group 62 repel the magnetic field generated by the electromagnet 65 and move to the center. Therefore, the zoom magnification can be increased by ⁇ times.
- the state shown in FIG. 18 (b) can be returned to the state shown in FIG.
- FIG. 19 shows a ninth embodiment of the present invention.
- This embodiment is based on the seventh and eighth embodiments described above. The difference is that one compression coil panel 6 4 ′ is provided between the front lens group 61 and the rear lens group 62, and the front lens group 61 and the rear lens group are formed by the elastic restoring force of the compression coil panel 64 ′. The groups 62 are urged away from each other. Further, the positioning stoppers 66 'provided at both ends are formed of a non-magnetic material, and the center positioning stopper 6T is formed of a magnetic material. Cried. Furthermore, the core 65 a provided on the electromagnet 65 was provided at a central portion in the axial direction of the electromagnet 65.
- a position close to the center positioning stopper 67 ' is good.
- the magnetizing directions of the permanent magnets 68 provided in the front lens group 61 and the rear lens group 62 are set to be opposite to each other.
- an image sensor is arranged at a predetermined position behind the housing 60.
- FIG. 20 shows a tenth embodiment of the present invention.
- the operation characteristics shown in FIG. 5 are realized while using an electromagnet as an actuator, and a zoom magnification of 1 ⁇ and ⁇ This is a lens drive device that can take two types of magnification.
- the basic configuration is the same as that of the eighth embodiment.
- the positioning stoppers 66 disposed at both ends of the cylindrical body 63 are made of a magnetic material, and the center positioning stoppers ⁇ are also made of a magnetic material.
- the front lens group 61 and the rear lens group 62 are connected to both ends of a compression coil spring 64 ′ arranged so as to be interposed between them, and the compression It is biased in a direction away by the elastic restoring force of contraction Koirupane 6 4 7.
- What is different is the position of the front lens group 61 in the basic posture where the zoom magnification is 1. That is, as shown in FIG. 20 (a), the front lens group 61 is held in the basic posture by magnetic attraction in contact with the center positioning stopper 67 '.
- the rear lens group 62 is urged rearward by the elastic restoring force of the compression coil panel 6, and is held in a state where the rear lens group 62 is abutted against the positioning hook °° 66. Further, the magnetizing directions of the permanent magnets 68 provided in the front lens group 61 and the rear lens group 62 (directions of arrows in the figure) are directed outward.
- the zoom magnification becomes larger. It can be ⁇ times.
- the zoom magnification is maintained at ⁇ times.
- the zoom position returns to the basic position shown in Fig. 20 (a) with a magnification of 1x. Therefore, in the present embodiment, it is possible to configure a lens driving device that can obtain two types of zoom magnifications of 1 ⁇ and ⁇ ⁇ based on the operation characteristics shown in FIG. Note that the other configurations, functions, and effects are the same as those of the above-described embodiments, and the corresponding members are denoted by the same reference numerals, and detailed description thereof will be omitted.
- FIG. 21 shows an eleventh embodiment of the present invention.
- This embodiment is a type that employs two types of zoom magnifications of 1 and ⁇ , as in the tenth embodiment described above.
- electromagnets 65 are different from those in the tenth embodiment. That is, the core 6 is located at the center of the electromagnet 65. 5 a is provided. In practice, this is realized by sandwiching the core 65 a between two electromagnets 65.
- the configuration of the electromagnet 65 is the same as that of the ninth embodiment shown in FIG.
- the permanent magnets 68 provided in each of the front lens group 61 and the rear lens group 62 have the same magnetization direction (the direction of the arrow in the figure) and are directed backward (to the right in the figure). Further, the positioning stoppers 66 'provided at both ends of the cylindrical body 63 are made of a non-magnetic material.
- FIG. 22 shows a main part of a 12th embodiment of the present invention. That is, in the present embodiment, the slide guide 73 is attached at a predetermined position around the front lens group 71 and the rear lens group 72, and the slide guide 73 is axially moved with respect to the slide shaft 74 via the slide guide 73. It is possible to move freely.
- the front lens group 71 and the rear lens group 72 adopt a configuration in which a lens is mounted in the support, and the optical axes of the lenses are aligned. Then, an image is formed on an image pickup device such as a CCD (not shown) arranged behind the rear lens group 72.
- an image pickup device such as a CCD (not shown) arranged behind the rear lens group 72.
- positioning stoppers 75 are mounted at predetermined positions on both ends of the slide shaft 74, and a center positioning stopper 76 is mounted at an intermediate point of the slide shaft 74.
- the front lens group 71 and the rear lens group 72 can be moved between the center positioning stopper 76 and the positioning stopper 75.
- the distance between the positioning stoppers 75, the length of the center positioning stopper 76, and the mounting position are set so as to obtain the operation characteristics shown in FIG.
- the zoom magnification can be set to 1.
- the drive mechanism for switching the zoom magnification between 1 ⁇ and 1 ⁇ is, for example, to attach a permanent magnet 77 to the front lens group 71 and the rear lens group 72
- the movable piece 78 made of a magnetic material is inserted freely. That is, the opposing surfaces of the permanent magnets 77 have the same polarity and repel each other.
- the movable piece 78 made of a magnetic material is inserted between the permanent magnets 77, the permanent magnets 77 move in a direction away from each other due to magnetic repulsion. Then, the positioning stopper 75 and the slide guide 73 are positioned and fixed in contact with each other.
- the attached permanent magnets 78 a and the permanent magnets 77 provided in the front lens group 71 and the rear lens group 72 are magnetized so as to be attracted.
- the permanent magnet 77 attached to the front lens group 71 and the rear lens group 72 is thin (about half).
- the magnetic body 77a may be arranged on the opposite surface side, and the magnetic body 77a may be arranged on the opposite side (outside). In this way, the amount of expensive permanent magnets used can be reduced, and a cost reduction effect can be expected. Note that the other configuration, operation, and effect are the same as those of the 12th embodiment and the modified example.
- the force of the compression coil spring 79 can be used. That is, based on the first and second embodiments, one end of the compression coil panel 79 is mounted outside the permanent magnets 77 provided in the front lens group 71 and the rear lens group 72. Of course, the position of the other end of the compression coil panel 79 is regulated by a panel suppressor (see reference numeral 63a in FIG. 17).
- the magnetic body 77 ′ is attached to the front lens group 71 and the rear lens group 72 as shown in FIG.
- the movable piece 7 8 made of a magnet is moved in and out between the magnetic bodies 7 7.
- FIG. 26 (a) when the movable piece 78 made of a permanent magnet is detached from the space between the magnetic members 77 ', the elastic member 79'
- the front lens group 7 1 and the rear lens group 7 2 are separated from each other,
- the system magnification can be set to 1, and the slide guide 73 can be positioned by contacting the positioning stopper 75 with the block.
- the magnetic body 77 ′ in the modification shown in FIG. 26 can be a permanent magnet 77.
- the elastic restoring force of the compression coil panel 79 is larger than the suction force, and the zoom magnification is set to 1 as shown.
- a movable piece 78 made of a permanent magnet is inserted between the permanent magnets 77, a large magnetic attraction force is generated between the movable piece 78 'and the permanent magnet 77, as shown in FIG. ),
- the slide guide 73 stops against the center positioning stopper 76. This makes it possible to increase the zoom magnification.
- the other configuration and operation and effect are the same as those of the 12th embodiment and its modified example, and the corresponding members are denoted by the same reference numerals and detailed description thereof will be omitted.
- FIG. 28 shows still another modification.
- the center positioning stopper 76 ' is attached to both surfaces of a movable piece 78 made of a magnetic material.
- the permanent magnets 77 repel each other, and the slide guides 73 contact the positioning stoppers 75 at both ends. The position is fixed.
- the permanent magnets 77 are magnetically attracted to each other with the magnetic material 78, and as shown in FIG. 7 7 comes in contact with the center positioning stopper 7 6 ′ and holds this position.
- FIG. 29 shows still another modification.
- the auxiliary magnet 8 is located near the stop position when the movable piece 78 made of a magnetic material is moved outward (see FIG. 29 (a)) based on the first and second embodiments. 0 is provided.
- the distance between the auxiliary magnets 80 is smaller than the distance between the permanent magnets 77 when the front lens group 71 and the rear lens group 72 are separated from each other, as shown in FIG. 29 (a).
- the distance between the permanent magnet 77 when the front lens group 71 and the rear lens group 72 attract magnetically is longer.
- the distance between the pair of permanent magnets 77 and the distance between the auxiliary magnets 80 is determined by the movable piece 78 made of a magnetic material. In this case, the permanent magnet 77 or the auxiliary magnet 80 exists in the immediate vicinity even if the movable piece 78 is moved to move out of that state.
- both Fig. 31 and Fig. 32 are moved manually. That is, in FIG. 31, an operating lever 82 is provided on a movable piece 78 made of a magnetic material, and the user moves the operating lever 82 to reciprocate linearly, thereby obtaining the configuration shown in FIG. 31 (a).
- the movable piece 78 is in the basic posture (zoom magnification: 1) separated from the space between the permanent magnets 77, and as shown in FIG. It can be inserted between the two to switch between two states with a zoom magnification of ⁇ times.
- the movable piece 78 and the operating lever 82 are made to move linearly.
- the movable piece 78 made of a magnetic material is attached to one end. Connect the lever 8 3 to the rotating shaft 8 3 a, and connect the operating 4 is provided.
- the operating lever 84 rotates forward and backward within a predetermined angle range around the rotating shaft 83a by moving the operating portion 84 substantially up and down (actually moving along an arc-shaped locus). Therefore, as shown in FIG. 32 (a), the movable piece 780 is in the basic posture (zoom magnification is 1) separated from the space between the permanent magnets 77, as shown in FIG. 32 (b).
- the movable piece 78 is inserted between the permanent magnets 77 so that the zoom magnification can be switched between two states of ⁇ times.
- the rotating shaft 83a can be used as the output shaft of the stepping motor 85.
- the movable piece 78 can be automatically put in and out between the permanent magnets 77 by rotating the stepping motor 85 forward and reverse, and the zoom magnification can be switched (FIG. 33 ( a) and (b)).
- a linear actuator 86 can be used as an actuator for automatically moving the movable piece 78. That is, as shown in FIG. 34, when a movable piece 78 is provided at the tip of a linearly reciprocating rod 86a constituting the linear actuator 86, and the rod 86a is pulled back.
- the movable piece 780 takes the basic position (zoom magnification is 1) at which the movable piece 178 is detached from the space between the permanent magnets 177 (see Fig. 34 (a)). It is inserted between the permanent magnets 77 so that the zoom magnification becomes ⁇ times (see Fig. 34 (b)).
- the two zoom magnifications can be switched by operating the linear actuator 86 by a switch operation (not shown).
- FIG. 36 to FIG. 38 show a thirteenth embodiment of the present invention.
- This embodiment is for realizing the operation characteristics shown in FIG. 7, and uses a stepping motor as an actuator for moving a lens group.
- the basic configuration is the same as that of the first embodiment, except that the front lens group is also movable.
- the flat rectangular base 10 has a high step portion 1 1 in which the front surface thereof is raised by about 1/4 including one corner. Then, the low step portion 12 of the remaining region is formed.
- small-diameter holes 13 are provided at three of the four corners of the high step portion 11, and a large-diameter through hole 14 is formed at the center.
- the center of the through hole 14 is the optical axis, and although not shown, an imaging device such as a CCD is disposed at a predetermined position behind the through hole 14.
- a small stepping motor 20 is installed.
- the stepping motor 20 has a case main body 21 that is substantially arcuately curved so as to follow the planar shape of the low step portion 12, and has an output shaft 22 protruding to the outside at the center thereof.
- a rotor is disposed in the center of the inside of the case main body 21, and the output shaft 22 is inserted into the center of the rotor and integrated. Further, stators are arranged on both sides of the case body 21 which are spread left and right.
- the stepping motor having such a configuration for example, those disclosed in Japanese Patent Application Laid-Open No. Hei 6-1055882 and Japanese Patent Application Laid-Open No. Hei 6_293658 can be used.
- the small-sized stepping motor is not limited to the one having such a configuration, and it is needless to say that various types of motors can be used.
- the distal end of the output shaft 22 is threaded and serves as a lead screw.
- the rear group movable body 30 is movably inserted into the guide bins 15a and 15b.
- the rear group movable body 30 has substantially the same planar shape as the base 10, and has a guide hole 31 penetrating at a position facing the hole 13 of the base 10, and a through hole of the base 10.
- a through hole 32 is provided at a position facing 14. The two guide pins 15a and 15b are inserted into the through hole 32, and the rear group movable body supported by the main guide pin 15a and the sub guide bin 15b is thereby inserted.
- a through hole 34 is formed in a portion of the rear group movable body 30 facing the output shaft 22 of the stepping motor 20, and a through hole 34 on the front side of the rear group movable body 30 is formed.
- a rectangular recess 35 is formed around the periphery.
- the lead nut 36 is inserted and fixed in the recess 35.
- the lead nut 36 engages with a lead screw provided on the output shaft 22 of the stepping motor 20, and the lead nut 36, and consequently, the rear group movable body 30 moves forward and backward with the forward and reverse rotation of the output shaft 22.
- the main guide pin 15 a is also provided upright at the corner of the low step 12 of the base 10, and the main guide pin 15 a mounted on the low step 12 Is mounted movably with respect to the rear group movable body 30.
- a front group movable body 40 ′ that supports the front lens group is mounted at the tip of each of the guide bins 15 a and 15 b provided in the high step portion 11.
- the front group movable body 4 is set to be movable by a predetermined distance in the axial direction with respect to each of the guide bins 15a and 15b. More specifically, the main guide pin 15a is inserted in a through state into a hole 44 having an inner diameter substantially matching the outer diameter of the main guide pin 15a.
- a disc-shaped stopper 45 is attached to the tip of each of the two sub guide bins 15b.
- the outer diameter of the stopper 45 is slightly larger than the outer diameter of the sub guide pin 15b.
- the above-described sub guide bin 15b is inserted into the hole 46 formed at a predetermined position of the front group movable body 40 so as to be relatively movable.
- the inner diameter of the hole 46 is substantially the same as the outer diameter of the sub guide bin 15 b at the rear part, and slightly larger than the outer diameter of the sub guide pin 15 b at the front part. However, it is possible to insert and arrange.
- a spring 47 is coaxially mounted on the tip side of the sub guide pin 15b.
- a spacer 43 is inserted and arranged in the sub guide bin 15 b in a fixed state on the rear surface side of the front group movable body 4.
- the thickness of the spacer 43 is, as shown in FIG. 38, the front lens group when the front group movable body 40 ′ and the rear group movable body 30 are both in contact with the spacer 43.
- the distance between the lens group and the rear lens group is set to the distance d3 shown in FIG. 7, that is, the distance between the lenses (C-1 (4)) at which the zoom magnification is ⁇ .
- a through hole 41 is provided at the center of the front group movable body 40 ′, that is, at a position facing the through holes 14 and 32 provided in the base 10 and the rear group movable body 30.
- the front lens group is inserted and arranged in the through hole 41.
- the zoom magnification can be set to 1x.
- the output shaft 22 of the stepping motor 20 is rotated forward to move the rear group movable body 30 forward, and as shown in FIG. 37, a predetermined position (non-contact with the front group movable body 40 ') as shown in FIG. Or a position where it does not bias forward when touched, the zoom magnification can be increased to j8 times (for example, 2 times). Since the stepping motor 20 is used as the actuator, the position of the rear group movable body 30 can be accurately controlled by controlling the number of steps.
- FIG. 39 is a side view for explaining the concept of the fourteenth embodiment of the present invention. In the above embodiments, optical zoom and focus are performed. Also allows you to do macros.
- the lens driving device arranges the front lens group 1 and the rear lens group 2 before and after the optical axis L, fixes the front lens group 1 at a fixed position, and drives the rear lens group 2 by driving means described later. Is moved in the optical axis direction.
- the front and rear group lenses 1 and 2 have a configuration in which the lens groups are fitted and supported in the annular frame bodies 3 and 4, and each lens group has a lens diameter of about 5 mm. Then, a plurality of guide pins 7, 7 are arranged along the optical axis L, and the front and rear frames 3, 4 are aligned in the optical axis direction by fitting holes formed in the outer periphery into the guide bins 7, 7. .
- an image sensor 6 such as a CCD is disposed on the back side of the rear lens group 2. Therefore, at the light receiving position of the image sensor 6, the magnification of the imaging changes according to the positional relationship between the three optical elements aligned with the optical axis L. This change in the zoom magnification is generally shown in FIG. The characteristics are as shown.
- the general optical characteristics of the two front and rear lens configurations are that the front group lens 1 also needs to be moved to properly obtain the zoom magnification from wide-angle (WIDE) to telephoto (TELE).
- the group lens 2 is moved linearly (characteristic b) to the subject side, and the front group lens 1 is moved to the image sensor 6 side and then moved back to the subject side in a curved shape (characteristic f). Will be needed.
- the driving means for moving the front group lens 1 is required separately, and it is impossible to reduce the size. Therefore, in this embodiment, the front group lens 1 is fixed at a fixed position (characteristic c), and only the rear group lens 2 is moved along the optical axis. The rear group lens 2 is stopped at two fixed positions A and B. As a result, the zoom magnification can be set to A at the fixed position A, and the zoom magnification can be set to B at the fixed position B.
- a lens driving device can be realized.
- the zoom magnification is 1; and 4.1.8 mm, the zoom magnification is 2 times.
- the rear lens group 2 is very small at the fixed positions A and B where it is stopped. Drive to move the distance.
- the minute movement at each of the fixed positions A and B is set so that the movement is performed at every feed pitch of 50 ⁇ m or less in the section of at least 600 ⁇ m before and after.
- the macro focus with the object distance of 5 cm was gotten.
- the imaging magnification changes to about A + 0.1, but the macro operation can be performed by driving to move a small distance at the fixed position A.
- the fixed position B on the side close to the front group lens 1 by moving about 100 m toward the image sensor 6, a macro focal point having an object distance of 5 cm was obtained.
- the imaging magnification changes to about B_0.1, but the macro operation can be performed by driving to move a small distance at the fixed position B.
- the focal point is at a position of 30 cm when the distance of small movement at each of the fixed positions A and B is several 10 ⁇ m, and the focal point is at a position of 1 m when the distance is about 10 m.
- the drive of the rear lens group 2 is set so that the feed pitch of the minute movement is set to several meters or less. In this way, by making the feed pitch smaller, it is possible to focus on the fixed position, and the focus operation becomes easier.
- FIGS. 8 and 9 are perspective views showing each part separately, Fig.
- FIG. 9 (a) shows a state in which the zoom magnification is A (basic position), and Fig. 9 (b) shows a state in which the zoom magnification is B. It is a perspective view which shows a double state. Since the mechanical configuration is the same as that of the first embodiment, the description of the same parts will be omitted.
- spacers 43 are inserted and arranged in each guide bin 15. This spacer 43 is adjusted in thickness.
- the moving position of the rear group movable body 30 can be accurately positioned according to the number of steps, and the rear group movable body 30 is moved backward by rotating the output shaft 22 in reverse. As shown in Fig. (A), stop at the fixed position A approaching the front of the base 10, and set the zoom magnification to A times based on this position.
- the rear group movable body 30 moves forward, and stops at a fixed position B approaching the spacer 43 as shown in FIG. 9 (b). Then, set the zoom magnification to B times.
- driving is performed to move a minute distance at each of the fixed positions A and B.
- the stepping motor 20 is a two-phase type with 12 steps and a lead screw with a 0.5 mm pitch is used, a feed of about 42 m per step can be realized with two-phase excitation. It can be switched to macro operation by several steps.
- the feed pitch finer for the focus operation It is necessary to make the feed pitch finer for the focus operation. If the stepping motor 20 has a pitch of 0.25 ⁇ m in 20 steps, for example, a feed rate of 12.5 ⁇ per step is used. Can be performed. Furthermore, if the drive is performed with one-two or two-phase excitation, a feed of 6.25 ⁇ can be performed per step, so that the focus operation can be performed more precisely.
- the rear group movable body 30, that is, the rear group lens can be moved to the fixed positions ⁇ and ⁇ ⁇ ⁇ by driving the stepping motor 20, and the minute movement can be performed at the fixed positions ⁇ and ⁇ . Therefore, a single actuator can be used to perform a binary zoom operation and By performing the operation and setting the feed pitch of the fine movement to several meters or less, the focus can be adjusted at the fixed position, and the focus operation can be easily performed.
- the base 10 is 11 mm square, and the inner diameters of the through holes 32 and 41, that is, the rear lens group and the front lens group.
- the diameter is 5 mm, and the height of the entire device (the distance from the bottom of the base 10 to the front of the front group support 40) is about 11 mm. As a result, it can be sufficiently mounted on a mobile phone.
- the area of the camera module is within 13 mm square even at a fixed focal point. If this level is the upper limit of adoption, it will be possible to use a slightly larger lens, and the total size (planar shape of the base 10) is 13 mm square or less up to a lens diameter of about 7 mm. It can be suppressed. Of course, using smaller lenses does not prevent further miniaturization as a whole. ⁇
- the stop position of the lens support member is limited to a small number such as one, two, or three (the zoom magnification is limited), so that a complicated mechanism is provided.
- the front lens is fixed, and only the rear lens is moved in association with the driving means, and stopped at two fixed positions, while moving a minute distance at those fixed positions.
- a binary zoom operation and a Mac mouth operation for a predetermined distance can be performed.
- the feed pitch of the fine movement can be set to several / less or less, it is possible to focus on the fixed position and to easily perform the focusing operation.
- the outer shape can be made ultra-small, and it can be preferably incorporated in mobile phones and the like that are becoming thinner and smaller.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03754191A EP1560053A1 (en) | 2002-10-21 | 2003-10-20 | Lens driver |
US10/531,854 US20060109565A1 (en) | 2002-10-21 | 2003-10-20 | Lens driver |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-306420 | 2002-10-21 | ||
JP2002306420A JP2004144795A (ja) | 2002-10-21 | 2002-10-21 | レンズ駆動装置 |
JP2003046010A JP2004258111A (ja) | 2003-02-24 | 2003-02-24 | レンズ駆動装置 |
JP2003-46010 | 2003-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004036281A1 true WO2004036281A1 (ja) | 2004-04-29 |
Family
ID=32109494
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/013369 WO2004036281A1 (ja) | 2002-10-21 | 2003-10-20 | レンズ駆動装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20060109565A1 (ja) |
EP (1) | EP1560053A1 (ja) |
WO (1) | WO2004036281A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1630582A1 (en) * | 2004-08-23 | 2006-03-01 | Samsung Electronics Co., Ltd. | Optical zoom apparatus and portable communication apparatus using the same |
EP1729170A2 (en) * | 2005-06-03 | 2006-12-06 | ASUSTeK Computer Inc. | Camera module and lens moving control device thereof |
US11119307B2 (en) | 2018-01-25 | 2021-09-14 | Olympus Corporation | Optical unit and endoscope |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI274223B (en) * | 2005-05-27 | 2007-02-21 | Asustek Comp Inc | Camera module and lens motion restoring device thereof |
US20070065131A1 (en) * | 2005-09-20 | 2007-03-22 | Chengping Wei | Auto-focusing and Zooming Systems and Method of Operating Same |
US7667905B2 (en) * | 2006-08-23 | 2010-02-23 | Nokia Corporation | Ultra compact zoom camera concept |
US7634189B2 (en) * | 2006-11-17 | 2009-12-15 | Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. | Two-step auto-focusing camera |
EP1944639A1 (en) * | 2007-01-11 | 2008-07-16 | STMicroelectronics (Research & Development) Limited | Focussing apparatus |
US8287195B2 (en) * | 2009-11-10 | 2012-10-16 | Dezeeuw Paul | Motor controlled macro rail for close-up focus-stacking photography |
JP6289009B2 (ja) * | 2013-10-07 | 2018-03-07 | オリンパス株式会社 | 電磁アクチュエータ |
JP6444765B2 (ja) * | 2015-02-24 | 2018-12-26 | オリンパス株式会社 | 撮像装置および内視鏡 |
JP7023674B2 (ja) * | 2017-11-06 | 2022-02-22 | キヤノン株式会社 | 光学装置 |
US11573391B2 (en) | 2019-04-30 | 2023-02-07 | Samsung Electro-Mechanics Co., Ltd. | Camera module |
CN112305729A (zh) * | 2019-08-02 | 2021-02-02 | Oppo广东移动通信有限公司 | 变焦镜头、相机模组和电子装置 |
CN111175952A (zh) * | 2019-12-31 | 2020-05-19 | Oppo广东移动通信有限公司 | 变焦镜头、相机模组和电子装置 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63236006A (ja) * | 1987-03-25 | 1988-09-30 | Canon Inc | 2焦点対物レンズ |
JPH06296358A (ja) * | 1993-04-06 | 1994-10-21 | Canon Electron Inc | ステッピングモータ |
JPH0739129A (ja) * | 1993-07-26 | 1995-02-07 | Matsushita Electric Ind Co Ltd | リニアアクチュエータ |
JPH07333501A (ja) * | 1994-06-14 | 1995-12-22 | Fuji Photo Optical Co Ltd | 2焦点切替レンズ系 |
JPH07333500A (ja) * | 1994-06-14 | 1995-12-22 | Fuji Photo Optical Co Ltd | 2群構成のズームレンズ |
JPH09329745A (ja) * | 1996-06-10 | 1997-12-22 | Nikon Corp | 切替え式変倍光学系 |
JP2000193877A (ja) * | 1998-12-28 | 2000-07-14 | Canon Inc | 位置制御装置、焦点調節装置及びカメラ |
JP2002131611A (ja) * | 2000-10-30 | 2002-05-09 | Minolta Co Ltd | レンズ駆動機構 |
JP2003098443A (ja) * | 2001-09-26 | 2003-04-03 | Olympus Optical Co Ltd | 光学装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1484414A (en) * | 1974-05-28 | 1977-09-01 | Schneider Co Optische Werke | Adjusting device for variable-focus lenses |
JPH116960A (ja) * | 1997-06-16 | 1999-01-12 | Olympus Optical Co Ltd | レンズ系および撮像装置 |
JPH11237549A (ja) * | 1998-02-19 | 1999-08-31 | Fuji Photo Optical Co Ltd | 簡易広角ズームレンズ |
TW573129B (en) * | 2001-11-16 | 2004-01-21 | Ind Tech Res Inst | Adjustable lens set device |
JP2004191453A (ja) * | 2002-12-09 | 2004-07-08 | Sony Corp | レンズ駆動装置および撮像装置 |
-
2003
- 2003-10-20 WO PCT/JP2003/013369 patent/WO2004036281A1/ja not_active Application Discontinuation
- 2003-10-20 US US10/531,854 patent/US20060109565A1/en not_active Abandoned
- 2003-10-20 EP EP03754191A patent/EP1560053A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63236006A (ja) * | 1987-03-25 | 1988-09-30 | Canon Inc | 2焦点対物レンズ |
JPH06296358A (ja) * | 1993-04-06 | 1994-10-21 | Canon Electron Inc | ステッピングモータ |
JPH0739129A (ja) * | 1993-07-26 | 1995-02-07 | Matsushita Electric Ind Co Ltd | リニアアクチュエータ |
JPH07333501A (ja) * | 1994-06-14 | 1995-12-22 | Fuji Photo Optical Co Ltd | 2焦点切替レンズ系 |
JPH07333500A (ja) * | 1994-06-14 | 1995-12-22 | Fuji Photo Optical Co Ltd | 2群構成のズームレンズ |
JPH09329745A (ja) * | 1996-06-10 | 1997-12-22 | Nikon Corp | 切替え式変倍光学系 |
JP2000193877A (ja) * | 1998-12-28 | 2000-07-14 | Canon Inc | 位置制御装置、焦点調節装置及びカメラ |
JP2002131611A (ja) * | 2000-10-30 | 2002-05-09 | Minolta Co Ltd | レンズ駆動機構 |
JP2003098443A (ja) * | 2001-09-26 | 2003-04-03 | Olympus Optical Co Ltd | 光学装置 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1630582A1 (en) * | 2004-08-23 | 2006-03-01 | Samsung Electronics Co., Ltd. | Optical zoom apparatus and portable communication apparatus using the same |
CN100399100C (zh) * | 2004-08-23 | 2008-07-02 | 三星电子株式会社 | 光学变焦距装置以及使用该装置的便携式通信装置 |
EP1729170A2 (en) * | 2005-06-03 | 2006-12-06 | ASUSTeK Computer Inc. | Camera module and lens moving control device thereof |
EP1729170A3 (en) * | 2005-06-03 | 2007-04-11 | ASUSTeK Computer Inc. | Camera module and lens moving control device thereof |
US11119307B2 (en) | 2018-01-25 | 2021-09-14 | Olympus Corporation | Optical unit and endoscope |
Also Published As
Publication number | Publication date |
---|---|
EP1560053A1 (en) | 2005-08-03 |
US20060109565A1 (en) | 2006-05-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11366333B2 (en) | Camera device having hand-shake correction function | |
JP2004144795A (ja) | レンズ駆動装置 | |
WO2004036281A1 (ja) | レンズ駆動装置 | |
US7391579B2 (en) | Minature zoom lens | |
US7440201B2 (en) | Lens driving device and portable equipment with camera | |
JP4250409B2 (ja) | レンズ駆動装置 | |
US7679225B2 (en) | Voice coil motors and pre-compression generation devices thereof | |
US8004779B2 (en) | Lens drive device | |
US20210041763A1 (en) | Blade driving device | |
JP2005037865A (ja) | レンズ駆動装置およびカメラ付き携帯機器 | |
KR100833152B1 (ko) | 액츄에이터 구조 및 그를 이용한 액츄에이터 블록, 및전자기기 | |
WO2005066681A1 (ja) | レンズ駆動装置 | |
US7215489B2 (en) | Optical apparatus | |
KR20170123615A (ko) | 날개 구동 장치 | |
JP2009265617A (ja) | レンズ駆動装置 | |
JP2017187694A (ja) | 駆動装置およびレンズユニット | |
JP2006098600A (ja) | カメラモジュール及びこのカメラモジュールを備えた携帯端末 | |
US7990463B2 (en) | Multi-stage lens driving device | |
EP3531542B1 (en) | Linear actuator | |
JP2006308704A (ja) | レンズ駆動装置 | |
JP4623714B2 (ja) | カメラモジュール及びこのカメラモジュールを用いた携帯端末 | |
TWI437795B (zh) | 音圈馬達 | |
CN213957720U (zh) | 驱动装置、光学部件驱动装置以及电子设备 | |
TWI337666B (en) | Dual regions focusing device | |
KR100684039B1 (ko) | 렌즈 구동기구 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2003754191 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2003754191 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2006109565 Country of ref document: US Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10531854 Country of ref document: US |
|
WWP | Wipo information: published in national office |
Ref document number: 10531854 Country of ref document: US |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 2003754191 Country of ref document: EP |