JP2010048967A - Lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens barrel which can secure an enough room to store the flexible circuit board which is made long (large) as the distance of contraction/extension movement of the movable components becomes large, without increasing the components, without complicating the mechanism, and also without causing discontinued wiring. <P>SOLUTION: The collapsible zoom lens barrel has a 2-group unit consisting of a 2-group lens barrel 202 and a 2-group holder 203, a moving cam cylinder 302, a fixed cam cylinder 303, a CCD105, a CCD holder 205, and a vibration-proof diaphragm/shutter drive FPC306. The fixed cam cylinder 303 has an FPC guide groove 303c to guide the vibration-proof diaphragm/shutter drive FPC306 extended from the 2-group unit, and an FPC escape hole 303d to guide the vibration-proof diaphragm/shutter drive FPC306 to the outside of the lens barrel. The FPC escape hole 303d has a width larger than the FPC guide groove 303c in the direction crossing the wiring direction of the vibration-proof diaphragm/shutter drive FPC306. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens barrel on which a flexible printed circuit board is mounted.

  2. Description of the Related Art Conventionally, there is a retractable lens barrel provided with a lens group feeding mechanism that stores a lens group in a camera body when not in a shooting state, and extends the lens group outward from the camera body to a predetermined position in a shooting state. There is also a zoom lens barrel that can change the focal length of the photographing lens by moving a plurality of lens groups in the optical axis direction. Furthermore, there is a retractable zoom lens barrel that has both functions of a retractable lens barrel and a zoom lens barrel.

  In the lens barrel having the above function, an aperture or a shutter that can be driven by an electromagnetic mechanism is configured to move on the optical axis integrally with a lens group that moves in the optical axis direction. There is a lens barrel. In this case, it is necessary to electrically connect an electromagnetic drive unit (such as a motor) that moves in the optical axis direction and a power supply terminal of the camera body that does not move in the optical axis direction. Therefore, the electromagnetic drive unit and the power terminal of the camera body are connected using a flexible printed circuit board. With respect to the displacement of the electromagnetic drive unit, the bending of the flexible printed circuit board is used so that the electromagnetic drive unit is always electrically connected regardless of the position of the electromagnetic drive unit.

  In addition to the lens barrels described above, there are various lens barrels. That is, in addition to a mechanism for moving the aperture and shutter, there is a vibration-proof lens barrel provided with an actuator that displaces the lens in a plane perpendicular to the optical axis so as to cancel camera shake. There is also a lens barrel in which a sensor for measuring the temperature in the lens barrel is integrally formed with the displacing optical group in the lens barrel. Also in this type of lens barrel, a flexible printed circuit board is used to connect an actuator or sensor to the camera terminal of the camera body.

  Incidentally, in recent years, with the increase in zoom lens magnification, multistage collapsible zoom lens barrels made up of a plurality of lens barrel members have been frequently used. In addition, in the lens barrel mounting type camera in which the components are electrically connected by FPC as described above, the amount of flexure of the flexible printed circuit board accompanying the operation from the extended state of the lens barrel to the retracted state is large. It has become to. An example of a conventional retractable zoom lens barrel is shown below.

  FIG. 11 is a cross-sectional view showing wiring (hereinafter referred to as scooping) of a flexible printed circuit board in a retracted state of a retractable zoom lens barrel according to a conventional example.

  In FIG. 11, the retractable zoom lens barrel includes a first group barrel 1021 that holds lenses L1 and 1011 and lenses L2 and 1012, a second group barrel 1022 that holds lenses L3 and 1013, and lenses L4 and 1014. A third group lens barrel 1023 is provided. The first group barrel 1021, the second group barrel 1022, and the third group barrel 1023 can move on the optical axis by the zoom operation of the retractable zoom lens barrel.

  The lens groups held by the first group lens barrel 1021 and the second group lens barrel 1022 are variable magnification lens groups, respectively, and the lens group held by the third group lens barrel 1023 is a focus lens group for focusing on a subject. It is. The second group barrel 1022 includes a shutter unit (not shown). Power is supplied to the shutter unit via a flexible printed circuit (FPC) 1031 connected to a terminal (not shown).

  The retractable zoom lens barrel shown in FIG. 11 is in a shooting standby state, and the first group barrel 1021 and the second group barrel 1022 are stored. The scooping of the FPC 1031 in the shooting standby state will be briefly described. The FPC 1031 passes from the shutter unit (not shown) in the second group barrel 1022 between the second group barrel 1022 and the straight barrel 1032, and between the fixed cam barrel 1034 and the movable cam barrel 1035 from the cutout of the CCD holder 1033. Pass through. Further, the FPC 1031 is led out of the lens barrel from the discharge holes of the fixed cam barrel 1034, the drive ring 1036 and the fixed barrel 1037.

  The first group barrel 1021 and the second group barrel 1022 are each provided with a cam pin that engages with a cam formed on the movable cam barrel 1035. When the zoom operation of the camera equipped with the retractable zoom lens barrel is started, the first lens barrel 1021 and the second lens barrel 1022 start to move in the optical axis direction by the rotation operation of the movable cam barrel 1035.

  In recent years, the retractable zoom lens barrel has a large amount of movement in the optical axis direction of the second group lens barrel 1022, and accordingly, the length of the FPC 1031 is also increased. Therefore, the above-described conventional FPC 1031 scooping configuration in the retractable zoom lens barrel has a problem in that it cannot fully absorb the long (large) deflection of the FPC 1031.

  Thus, the following flexible substrate housing structure has been proposed for the above problem (see, for example, Patent Document 1). The flexible substrate storage structure has one end connected to the electrical connection portion of the fixed member, and the other end is movable in a contracted manner with respect to the fixed member and is positioned in a direction perpendicular to the fixed member in the contracted state. Connected to the electrical connection of the member. And it can stretch with the expansion-contraction movement of a moving member.

In the flexible substrate housing structure, the fixed member and the moving member are provided with a substrate guide portion that serves as a bending guide for the flexible substrate and relatively moves in the expansion / contraction direction as the movement member expands and contracts. When the moving member is in a shortened state, the flexible substrate is overlapped in the orthogonal direction in the space between the fixed member and the moving member by the fixed member and the substrate guide portion of the moving member in a three-fold or more overlapping state. Bend and fold. Thereby, the necessary storage amount of the flexible substrate that is increased as the amount of expansion / contraction movement of the moving member increases is sufficiently ensured without adding the number of parts to the conventional structure.
JP 2001-264609 A

  However, in the method described in Patent Document 1, the flexible substrate is overlapped in the orthogonal direction in the space between the fixed member and the moving member by the fixed member and the substrate guide portion of the moving member. It has a structure that can be bent and folded. Therefore, as the moving member moves, the flexible substrate may be disconnected due to friction caused by sliding between the moving member and the flexible substrate.

  An object of the present invention is necessary for a flexible substrate that is configured to be longer (larger) as the amount of expansion and contraction movement of the moving member increases without increasing the number of parts, making the mechanism complicated, and without causing disconnection. An object of the present invention is to provide a lens barrel that can secure a sufficient amount of storage.

  In order to achieve the above-described object, the present invention provides a method for capturing an optical image of a subject in a lens barrel that includes an imaging element that is disposed at an end opposite to the subject side in the optical axis direction and captures the subject. A holding member that holds a lens that forms an image on the element and in which an electrical component is arranged, and is arranged concentrically outside the holding member and is movable in the optical axis direction. A moving member that moves in a direction, and is concentrically disposed outside the moving member and fixed to a base that holds the imaging element, and engages the moving member so that the moving member can move in the optical axis direction. A fixing member having a cam groove; and wiring from the holding member along at least a part of each of the base, the moving member, and the fixing member that holds the imaging device, and the electrical component and the lens mirror A flexible printed circuit board electrically connected to an external control means, and the fixing member further guides the flexible printed circuit board extended from the holding member, and guides by the guide groove A discharge hole for discharging the flexible printed circuit board to the outside of the lens barrel, and the discharge hole of the fixing member is larger than the guide groove in a direction intersecting the wiring direction of the flexible printed circuit board It has a width.

  According to the present invention, the discharge hole for discharging the flexible printed circuit board to the outside of the lens barrel has a larger width than the guide groove in the direction intersecting the wiring direction of the flexible printed circuit board. This does not increase the number of parts, does not complicate the mechanism, and does not cause disconnection, and the storage capacity required for a flexible board that is configured to be long (large) as the amount of expansion / contraction movement of the moving member increases. Can be sufficiently secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the dimensions, shapes, relative arrangements, and the like of the components exemplified in the embodiments of the present invention should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. It is not limited to those examples.

  FIG. 1 is a cross-sectional view showing a retracted configuration of a retractable zoom lens barrel as a lens barrel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the retractable zoom lens barrel in the TELESCOPE (telephoto shooting) state.

  1 and 2, the retractable zoom lens barrel has a three-group lens configuration including a first group lens, a second group lens, and a third group lens that form an optical image of a subject on an imaging device. A lens barrel 201, a second group unit, and a third group lens barrel 204 are provided. The second group unit includes a second group barrel 202 and a second group holder 203. The first group lens barrel 201 holds the first group lens 101 and the first group lens 102. The second group lens barrel 202 includes an aperture / shutter. The second group holder 203 holds the second group lens 103. The third group lens barrel 204 holds the third group lens 104.

  The first group barrel 201, the second group holder 203, the second group unit, and the third group barrel 204 can move on the optical axis by a zoom operation of a retractable zoom lens barrel mounted on an imaging device (not shown). It is configured to be possible. The first group lenses 101 and 102 held by the first group barrel 201 and the second group lens 103 held by the second group holder 203 of the second group unit are variable power lens groups. The third group lens 104 held by the third group barrel 204 is a focus lens group for focusing on a subject.

  Further, the retractable zoom lens barrel includes a linear guide barrel 301, a movable cam barrel 302 (moving member), a fixed cam barrel 303 (fixed member), a drive ring 304, a barrel cover 305, an aperture / shutter / anti-vibration drive. A flexible printed circuit board 306 is provided. The moving cam cylinder 302 is concentrically disposed outside the linear guide cylinder 301. The fixed cam cylinder 303 is disposed concentrically outside the movable cam cylinder 302. The drive ring 304 is disposed concentrically outside the fixed cam cylinder 303. The lens barrel cover 305 is disposed concentrically outside the drive ring 304. Details of each part will be described later.

  Next, the configuration of the second group unit will be described with reference to FIG.

  FIG. 3 is an exploded perspective view showing a configuration when the second group unit of the retractable zoom lens barrel is viewed from the subject side.

  In FIG. 3, the second group unit (holding member) includes the second group holder 203 that holds the second group lens 103 and the second group barrel 202 that includes an aperture / shutter, as described above. In the second group lens barrel 202, a stepping motor 207 (electric part), a stepping motor 208 (electric part), an anti-vibration driving ball 209, and a coil 211 are arranged. The stepping motor 207 is a drive source for changing the aperture diameter. The stepping motor 208 is a drive source that drives the shutter.

  A sensor holder 210 is disposed on the outer periphery of the second group holder 203. The second group holder 203 is an anti-vibration lens holder. Based on the movement of the second group holder 203, it is possible to correct blurring of the subject on the side of the imaging apparatus to which the retractable zoom lens barrel is attached. The second group holder 203 is placed on the anti-vibration driving balls 209 disposed at three positions of the second group barrel 202, and is urged by three tension springs (not shown). It is held by the second group barrel 202. By detecting blurring of the subject on the side of the image pickup apparatus to which the retractable zoom lens barrel is mounted, the second group holder 203 is placed on the anti-vibration driving balls 209 disposed at three positions of the second group lens barrel 202. Can be driven in a direction perpendicular to the optical axis within a certain range.

  Next, the vibration isolation mechanism will be described with reference to FIG. In the second group barrel 202, coils 211 are arranged at two locations. In the second group holder 203, magnets (not shown) are arranged at two positions that are opposed to the two coils of the second group lens barrel 202 in the optical axis direction. The sensor holder 210 disposed on the outer periphery of the second group holder 203 includes hall elements (electrical parts) (not shown) at positions facing the two magnets of the second group holder 203 in the optical axis direction. Yes.

  Further, a diaphragm / shutter / anti-vibration driving flexible printed circuit board (hereinafter, diaphragm / shutter / anti-vibration FPC) 306 is arranged in the sensor holder 210. An aperture / shutter / anti-vibration FPC 306 includes stepping motors 207 and 208 and Hall elements (electrical parts) included in the aperture / shutter / anti-vibration unit inside the lens barrel, and a controller (control means) (not shown) outside the lens barrel. It is FPC for electrically connecting.

  The aperture / shutter / anti-vibration FPC 306 is wired from the second group unit along at least a part of each of the CCD holder 205, the movable cam barrel 302, and the fixed cam barrel 303. The details of the wiring of the aperture / shutter / anti-vibration FPC 306 will be described later with reference to FIGS. Ends inside the lens barrel of the aperture / shutter / anti-vibration FPC 306 are soldered to the stepping motors 207 and 208 and the Hall element. The sensor holder 210 positions the hall element.

  In the retractable zoom lens barrel, the sensor holder 210, the second group holder 203, and the second group barrel 202 are integrated as a second group unit by the FPC holding plate 206. With this configuration, the second group unit changes the aperture opening, opens and closes the shutter, and also performs an operation for correcting blurring of the subject.

  Next, driving of the third group barrel 204 that holds the third group lens 104 that is the focus lens group will be described.

  FIG. 4 is a perspective view showing the configuration of the third group barrel 204 of the retractable zoom lens barrel.

  FIG. 4 shows a third group barrel 204 that holds a third group lens 104 that is a focus lens group, and a CCD holder unit that holds a CCD 105 (FIG. 1) that is an image sensor. The CCD holder unit includes a CCD 105 and a CCD holder 205 that holds the CCD 105. The CCD 105 is disposed at the end opposite to the subject side in the optical axis direction of the retractable zoom lens barrel, and performs imaging to convert the optical image of the imaged subject into an electrical signal. The focus lens unit includes a third group lens 104, a third group lens barrel 204, a stepping motor 501, a lead screw 502, a nut 503, a guide bar 504, and a tension spring 505.

  The third group barrel 204 holds the third group lens 104 having a function of focusing on the subject. The stepping motor 501 drives the third group barrel 204. The lead screw 502 is configured integrally with the stepping motor 501 and moves the third group barrel 204 in parallel with the optical axis. The nut 503 engages with the third group barrel 204 and is screwed into the lead screw 502, so that the third group barrel 204 can be moved by the rotation of the lead screw 502.

  The guide bar 504 guides the third group barrel 204 so that it can move parallel to the optical axis when the third group barrel 204 moves on the optical axis by the rotation of the lead screw 502. The tension spring 505 urges the third group barrel 204 and has a function of removing backlash in the optical axis direction when the third group barrel 204 moves on the optical axis by the rotation of the lead screw 502.

  Here, in order to prevent the nut 503 from rotating together with the rotation of the lead screw 502 when the nut 503 is screwed into the lead screw 502, the nut 503 has a U-shaped groove (not shown). Is formed. When the U-shaped groove-shaped portion of the nut 503 is fitted into an engaging portion (shaft-shaped portion) (not shown) with the nut 503 in the third group barrel 204, the nut 503 rotates together with the lead screw 502. Is preventing.

  The drive source (stepping motor 501) and the guide bar 504 are attached to the CCD holder 205. Accordingly, it is possible to ensure the feeding accuracy when the third group barrel 204 is moved in the optical axis direction by preventing the positioning of the drive source and the tilting of the guide bar 504.

  A tension spring 505 that biases the third group barrel 204 is attached between the third group barrel 204 and the CCD holder 205 and is always biased toward the CCD 105 in the optical axis direction.

  The steady rest that prevents the third group barrel 204 from rotating together with the rotation of the lead screw 502 when moving the optical axis is formed integrally with the CCD holder 205. The steady stop and the U-shaped hole-shaped portion (not shown) of the third group barrel 204 prevent the third group barrel 204 from rotating together with the rotation of the lead screw 502.

  The CCD holder 205 is equipped with a photo interrupter 506 that detects the reference position of the third group barrel 204. In an imaging device (not shown) equipped with a retractable zoom lens barrel, position information of the third group barrel 204 is obtained based on a detection signal from the photo interrupter 506 when the power is turned on. Further, in the imaging apparatus, the third group barrel 204 is driven by driving the stepping motor 501 while counting the number of pulses with the reference position of the third group barrel 204 detected by the photo interrupter 506 as a reset position (collapse standby position). To pay out. Thereby, the focusing operation for the subject is performed.

  Next, a first group barrel 201 that holds a zoom lens group (first group lenses 101 and 102), a second group holder 203 that holds a zoom lens group (second group lens 103), and a second group mirror. The driving of the second group unit composed of the cylinder 202 will be described.

  FIG. 5 is a configuration diagram showing a state in which the outer cover of the retractable zoom lens barrel is removed.

  FIG. 5 shows a configuration of a drive mechanism including a zoom motor in a state where an outer cover of the retractable zoom lens barrel is removed. The retractable zoom lens barrel includes a zoom motor 401, gear trains 402, 403, 404, 405, 406, and a drive ring 304. The force generated by the zoom motor 401 is transmitted from the zoom motor 401 to the drive ring 304 while being decelerated through the gear trains 402 to 406.

  A gear-shaped portion 304 c for receiving force transmitted from the gear trains 402 to 406 is formed on the outer peripheral portion of the drive ring 304. When the force is transmitted from the zoom motor 401 to the drive ring 304 via the gear trains 402 to 406 and the gear shape portion 304c, the drive ring 304 starts to rotate.

  As shown in FIG. 1, the drive ring 304 is shaken in the optical axis direction by a fixed cam barrel 303 disposed inside the drive ring 304 and a lens barrel cover 305 disposed outside the drive ring 304. Is regulated. As a result, the drive ring 304 rotates without moving in the optical axis direction. Further, as shown in FIG. 8 to be described later, on the inner peripheral portion of the drive ring 304, straight key grooves 304a extending in the optical axis direction are formed at three positions spaced by 120 degrees in the inner peripheral direction. .

  FIG. 6 is an inner development view showing the shape of the inner peripheral portion of the fixed cam barrel 303 of the retractable zoom lens barrel.

  In FIG. 6, the inner periphery of the fixed cam cylinder 303 arranged inside the drive ring 304 (FIG. 1) has the same shape and groove shape at three positions spaced every 120 degrees in the inner peripheral direction. A cam groove 303a is formed. The cam groove 303 a (cam) of the fixed cam barrel 303 has a function of moving the second group unit (holding member) composed of the second group barrel 202 and the second group holder 203 in the optical axis direction via the movable cam barrel 302. . The fixed cam cylinder 303 is formed with through cam holes 303b having the same shape and a hole shape penetrating the inner peripheral portion and the outer peripheral portion at three positions spaced every 120 degrees in the circumferential direction. .

  The inner periphery of the drive ring 304 and the outer periphery of the fixed cam cylinder 303 are in a fitted state. As a result, even when a force from the zoom motor 401 is transmitted to the drive ring 304, the drive ring 304 can rotate without rattling in the circumferential direction. Further, since the fixed cam barrel 303 is fastened (fixed) to the CCD holder 205 (base of the lens barrel) by screws (not shown), the light can be emitted even when the zoom motor 401 is driven, like the drive ring 304. There is no movement in the axial direction.

  Further, the cam groove 303a and the through cam hole 303b of the fixed cam cylinder 303 will be described. As described above, the three cam grooves 303 a of the fixed cam cylinder 303 are formed at equal intervals of 120 degrees in the inner peripheral direction of the inner peripheral portion of the fixed cam cylinder 303. In addition, the through cam holes 303b of the fixed cam cylinder 303 are also formed at equal intervals of 120 degrees in the circumferential direction of the fixed cam cylinder 303, similarly to the cam groove 303a. The through cam hole 303b of the fixed cam cylinder 303 forms the same locus as the cam groove 303a.

  FIG. 7 is an inner development view showing the shape of the inner periphery of the movable cam barrel 302 of the retractable zoom lens barrel. FIG. 8 is an exploded perspective view showing the configuration of the movable cam barrel 302, the fixed cam barrel 303, the drive ring 304, and the barrel cover 305 on which the aperture / shutter / anti-vibration FPC 306 of the retractable zoom lens barrel is mounted.

  7 and 8, a movable cam barrel 302 for driving (moving) the first group barrel 201 and the second group barrel 202 in the optical axis direction is disposed inside the fixed cam barrel 303 (FIG. 1). ing. A cam 302a for driving (moving) the first group barrel 201 in the optical axis direction at three positions spaced by 120 degrees in the inner circumferential direction is provided on the inner circumferential portion of the movable cam barrel 302, and the second group. Cams 302b for driving the lens barrel 202 in the optical axis direction are formed.

  On the outer peripheral portion of the moving cam barrel 302, driving pins 302d are integrally formed at three locations spaced every 120 degrees in the outer peripheral direction. The drive pin 302d of the movable cam barrel 302 passes through the through cam hole 303b (FIG. 6) of the fixed cam barrel 303 and comes out to a position overlapping the inner periphery of the drive ring 304. It engages with a straight keyway 304a formed in the peripheral portion.

  In addition, cam pins 302c are integrally formed on the outer peripheral portion of the movable cam barrel 302 at three locations spaced every 120 degrees in the outer peripheral direction. The cam pin 302c of the movable cam barrel 302 engages with the cam groove 303a (FIG. 6) of the fixed cam barrel 303, so that the movable cam barrel 302 can be moved in the optical axis direction.

  When the drive ring 304 starts to rotate by the driving force transmitted from the zoom motor 401 via the deceleration system gear trains 402 to 406 (FIG. 5), the movable cam barrel 302 also starts to rotate. That is, since the rectilinear key groove 304 a formed on the inner peripheral portion of the drive ring 304 and the driving pin 302 d formed on the outer peripheral portion of the moving cam barrel 302 are engaged, the moving cam is rotated according to the rotation of the drive ring 304. The cylinder 302 also starts to rotate.

  When the movable cam barrel 302 starts to rotate, the drive pin 302d of the movable cam barrel 302 rotates along the through cam 303b of the fixed cam barrel 303 disposed outside the movable cam barrel 302. Along with this, the cam pin 302 c disposed outside the movable cam cylinder 302 starts moving in the optical axis direction while engaging with the cam groove 303 a of the fixed cam cylinder 303.

  As the moving cam barrel 302 rotates, the first group barrel 201 and the second group barrel 202 also start to move in the optical axis direction. On the outer peripheral portion of the first group barrel 201, metal pins (not shown) are arranged at three locations spaced every 120 degrees in the outer peripheral direction with a configuration (separate) from the first group barrel 201. Yes. The metal pins disposed at three locations on the outer peripheral portion of the first group barrel 201 are engaged with cams 302a formed at equal intervals at three locations on the inner peripheral portion of the movable cam barrel 302, whereby the first group mirror The cylinder 201 starts to move in the optical axis direction.

  Further, as shown in FIG. 1, a rectilinear guide cylinder 301 is arranged inside the first group barrel 201 so that the first group barrel 201 does not rotate together with the movable cam barrel 302 (see the lower part of FIG. 1). ). Even when the movable cam barrel 302 rotates, the first-group lens barrel 201 moves straight in the optical axis direction without rotating in the optical axis direction while rotating by the straight guide tube 301. The same applies to the second group unit.

  Further, on the outer peripheral portion of the second group barrel 202, metal pins (not shown) are arranged in three locations spaced apart every 120 degrees in the outer peripheral direction (separately) from the second group barrel 202. Has been. Metal pins arranged at three locations on the outer peripheral portion of the second group barrel 202 are engaged with cams 302b formed at equal intervals at three locations on the inner peripheral portion of the movable cam barrel 302, whereby the second group mirror The second group unit including the cylinder 202 and the second group holder 203 starts to move in the optical axis direction.

  Further, as shown in FIG. 1, a rectilinear guide cylinder 301 that guides the rectilinear movement of the first group barrel 201 is arranged outside the second group unit so that the second group unit does not rotate together with the movable cam barrel 302. ing. When the movable cam barrel 302 is rotated, as in the case of the first group barrel 201, the second group unit moves straight in the optical axis direction without rotating in the optical axis direction while rotating by the straight guide tube 301. It is.

  Next, the connection between the aperture / shutter / anti-vibration FPC 306 mounted on the retractable zoom lens barrel and the lens barrel FPC outside the lens barrel will be described with reference to FIG.

  As shown in FIG. 8, an FPC hole 303 e for inserting the aperture / shutter / anti-vibration FPC 306 is formed in the side surface (peripheral wall) of the fixed cam cylinder 303. The aperture / shutter / anti-vibration FPC 306 is an FPC for electrically connecting the stepping motors 207 and 208 inside the retractable zoom lens barrel and the Hall element to the outside of the barrel as described above.

  An FPC slit 304 b is formed on the side surface (peripheral wall) of the drive ring 304. The FPC slit 304 b of the drive ring 304 is configured to overlap the FPC hole 303 e of the fixed cam cylinder 303 in a state where the drive ring 304 is incorporated in the fixed cam cylinder 303. The drive ring 304 rotates, but the diaphragm / shutter / anti-vibration FPC 306 integrated with the second group holder 203 does not rotate. Therefore, the FPC slit 304b of the drive ring 304 is formed in a long hole shape extending in the circumferential direction.

  An FPC hole 305 a configured to overlap with the FPC hole 303 e of the fixed cam cylinder 303 is formed on a side surface (peripheral wall) of the lens barrel cover 305.

  As described above, the FPC hole 303e of the fixed cam barrel 303, the FPC slit 304b of the drive ring 304, and the FPC hole 305a of the lens barrel cover 305 are configured to overlap each other. With this configuration, from the inside of the retractable zoom lens barrel, the aperture / shutter / anti-vibration FPC 306 is formed in the order of the FPC hole 303e of the fixed cam barrel 303, the FPC slit 304b of the drive ring 304, and the FPC hole 305a of the barrel cover 305. Insert. Thereby, as shown in FIG. 1, the aperture / shutter / anti-vibration FPC 306 can be led to the outside of the retractable zoom lens barrel.

  Next, FIGS. 1, 2, and 8 show the relationship among the aperture / shutter / anti-vibration FPC 306, the FPC hole 303e of the fixed cam cylinder 303, the FPC slit 304b of the drive ring 304, and the FPC hole 305a of the lens barrel cover 305. This will be described with reference to FIGS.

  FIG. 9 is a cross-sectional view showing the direction of the force applied to the aperture / shutter / anti-vibration FPC 306 when the retractable zoom lens barrel is changed from the TELESCOPE state to the retracted state. FIG. 10 is a cross-sectional view showing the state in which the aperture / shutter / anti-vibration FPC 306 is turned and the direction of the force applied to the aperture / shutter / anti-vibration FPC 306.

  In the retracted state of the retractable zoom lens barrel (FIG. 1), the aperture / shutter / anti-vibration FPC 306 is extended from the stepping motors 207 and 208 and the Hall elements arranged in the second group unit inside the lens barrel. The aperture / shutter / anti-vibration FPC 306 passes through a gap between the second group barrel 202 and the straight guide cylinder 301 constituting the second group unit.

  Further, the aperture / shutter / anti-vibration FPC 306 passes through the gap between the bottom surface of the rectilinear guide tube 301 and the CCD holder 205 in the direction perpendicular to the optical axis, and the FPC guide groove 303c (see FIG. 9)) in the direction of the optical axis. The FPC guide groove 303c (guide groove) of the fixed cam cylinder 303 has a function of guiding the aperture / shutter / anti-vibration FPC 306.

  Further, the aperture / shutter / anti-vibration FPC 306 is led out of the lens barrel through the FPC hole 303e of the fixed cam barrel 303, the FPC slit 304b of the drive ring 304, and the FPC hole 305a (see FIG. 8) of the lens barrel cover 305. . The diaphragm / shutter / anti-vibration FPC 306 is connected to a connector (not shown) provided on the FPC outside the lens barrel.

  In this case, the FPC guide groove 303c of the fixed cam barrel 303 has a minimum clearance with respect to the width of the aperture / shutter / anti-vibration FPC 306 so that the aperture / shutter / anti-vibration FPC 306 is led out of the lens barrel without being caught. It is set to a width that takes As a result, the diaphragm / shutter anti-vibration FPC 306 can be led out of the lens barrel without being caught.

  In the retracted state of the retractable zoom lens barrel, there is not enough storage space for the aperture / shutter / anti-vibration FPC 306 inside the barrel. Therefore, an amount that cannot be stored inside the lens barrel of the aperture / shutter / anti-vibration FPC 306 escapes from the FPC escape hole 303d (discharge hole) of the fixed cam cylinder 303 to the outside of the lens barrel. The shape of the FPC escape hole 303d of the fixed cam cylinder 303 will be described later.

  When the retractable zoom lens barrel is extended from the retracted state (FIG. 1), the retractable zoom lens barrel is in the TELESCOPE state (FIG. 2). In the telescopic state, the retractable zoom lens barrel has the second group unit that is made up of the second group barrel 202 and the second group holder 203 extended most.

  In the TELESCOPE state of the retractable zoom lens barrel (FIG. 2), the aperture / shutter / anti-vibration FPC 306 is extended from the stepping motors 207 and 208 and the hall elements arranged in the second group unit inside the barrel. The aperture / shutter / anti-vibration FPC 306 passes through a gap between the second group barrel 202 and the straight guide cylinder 301 constituting the second group unit.

  Further, the aperture / shutter / anti-vibration FPC 306 is led out of the lens barrel through the FPC hole 303e of the fixed cam barrel 303, the FPC slit 304b of the drive ring 304, and the FPC hole 305a (see FIG. 8) of the lens barrel cover 305. . The diaphragm / shutter / anti-vibration FPC 306 is connected to a connector (not shown) provided on the FPC outside the lens barrel.

  In the TELESCOPE state, the length of the aperture / shutter / anti-vibration FPC 306 is set so as not to be excessive or insufficient. Therefore, in the TELESCOPE state, the aperture / shutter / anti-vibration FPC 306 is led out of the lens barrel without letting the aperture / shutter / anti-vibration FPC 306 escape from the FPC escape hole 303d of the fixed cam barrel 303 to the outside of the lens barrel. be able to.

  Next, how the aperture / shutter / anti-vibration FPC 306 moves when the retractable zoom lens barrel changes from the TELESCOPE state to the retracted state will be described with reference to FIGS.

  As described above, in the retracted state of the retractable zoom lens barrel, there is not enough storage space for the aperture / shutter / anti-vibration FPC 306 inside the barrel. Therefore, the portion that cannot be stored inside the lens barrel of the aperture / shutter / anti-vibration FPC 306 escapes from the FPC escape hole 303d of the fixed cam barrel 303 to the outside of the barrel. The direction of the force applied to the diaphragm / shutter / anti-vibration FPC 306 when the diaphragm / shutter / anti-vibration FPC 306 is released to the outside of the lens barrel is the direction of arrow A in FIG.

  As the retractable zoom lens barrel changes from the TELESCOPE state to the retracted state, the second group unit moves from the extended state to the retracted state and is retracted into the lens barrel. Thus, the aperture / shutter / anti-vibration FPC 306 is released from the FPC escape hole 303d of the fixed cam barrel 303 to the outside of the lens barrel.

  Further, when the aperture / shutter / anti-vibration FPC 306 is released to the outside of the lens barrel, the aperture / shutter / anti-vibration FPC 306 is swung in the direction of arrow B in FIG. Will be missed.

  In order to suppress the shake of the aperture / shutter / anti-vibration FPC 306, the fixed cam cylinder 303 is formed with an FPC guide groove 303c for guiding the aperture / shutter / anti-vibration FPC 306. As shown in FIG. 10, the FPC guide groove 303c of the fixed cam cylinder 303 is formed from the FPC hole 303e of the fixed cam cylinder 303 toward the FPC escape hole 303d arranged on the CCD side in the optical axis direction.

  Further, the FPC guide groove 303c of the fixed cam cylinder 303 is formed to have a narrow width so that the movement of the diaphragm / shutter / anti-vibration FPC 306 is not caught in order to suppress the above-described shake of the diaphragm / shutter / anti-vibration FPC 306 as much as possible. Has been. Further, the width of the FPC guide groove 303c of the fixed cam cylinder 303 is formed so as to keep a constant width along the optical axis direction.

  Further, as shown in FIG. 10, the FPC escape hole 303d of the fixed cam cylinder 303 has a width larger than the FPC guide groove 303c from the end of the FPC guide groove 303c of the fixed cam cylinder 303 toward the CCD holder in the optical axis direction. Is formed. In other words, the FPC escape hole 303d of the fixed cam barrel 303 has a width larger than that of the FPC guide groove 303c in a direction orthogonal (crossing) to the wiring direction of the aperture / shutter / vibration-proof FPC 306.

  By forming the FPC relief hole 303d of the fixed cam cylinder 303 in the shape as described above, the following operational effects are obtained. Even when the aperture / shutter / anti-vibration FPC 306 is swung in the direction of arrow B in FIG. 10 when the retractable zoom lens barrel is driven, the aperture / shutter / anti-vibration FPC 306 is inserted into the FPC escape hole 303 d of the fixed cam barrel 303. This makes it possible to prevent being caught.

  As described above, according to the present embodiment, the retractable zoom lens barrel has the following configuration. The fixed cam barrel 303 has an FPC guide groove 303c for guiding the diaphragm / shutter / anti-vibration driving FPC 306 extended from the second group unit, and an FPC escape hole 303d for guiding the diaphragm / shutter / anti-vibration driving FPC 306 to the outside of the lens barrel. Have. The FPC escape hole 303d has a width larger than that of the FPC guide groove 303c in a direction orthogonal (crossing) to the wiring direction of the diaphragm / shutter / anti-vibration driving FPC 306.

  With the above configuration, it is possible to prevent the aperture / shutter / anti-vibration FPC 306 from being caught in the FPC escape hole 303d of the fixed cam cylinder 303 or from being disconnected due to sliding friction when the movable cam cylinder 302 is moved. Therefore, without increasing the number of parts, complicating the mechanism, and further causing no disconnection, the diaphragm / shutter / anti-vibration FPC 306 is configured to be longer (larger) as the amount of expansion / contraction movement of the movable cam barrel 302 increases. On the other hand, the necessary storage capacity can be sufficiently secured.

[Other Embodiments]
In the above embodiment, the case where the FPC escape hole 303d of the fixed cam cylinder 303 is formed in a shape having a certain width in the optical axis direction is described as an example, but the present invention is not limited to this. The FPC escape hole 303d of the fixed cam cylinder 303 may be formed in a shape that increases in width as it approaches the CCD holder 205 side in the optical axis direction.

  In the above embodiment, an example is given in which a flexible printed circuit board is used to electrically connect the diaphragm / shutter / vibration prevention unit inside the lens barrel and the controller outside the lens barrel. Absent. The present invention can also be applied to a case where an electrical connection is made between a temperature measurement sensor disposed inside a lens barrel and a controller outside the lens barrel using a flexible printed circuit board. Furthermore, the present invention can also be applied to the case where the flexible printed circuit board is used to electrically connect the actuator for driving the first group lens barrel arranged inside the lens barrel and the controller outside the lens barrel.

It is sectional drawing which shows the structure of the retracted state of the retractable zoom lens barrel as a lens barrel which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the telescope state of a retractable zoom lens barrel. It is a disassembled perspective view which shows the structure at the time of seeing the 2 group unit of a retractable zoom lens barrel from the to-be-photographed object side. It is a perspective view which shows the structure of the 3 group lens barrel of a retractable zoom lens barrel. It is a block diagram which shows the state which removed the outer cover of the retractable zoom lens barrel. It is an inner side developed view which shows the shape of the inner peripheral part of the fixed cam cylinder of a retractable zoom lens barrel. It is an inner side developed view which shows the shape of the inner peripheral part of the movable cam cylinder of a retractable zoom lens barrel. FIG. 3 is an exploded perspective view showing configurations of a movable cam barrel, a fixed cam barrel, a drive ring, and a barrel cover on which a diaphragm / shutter / anti-vibration FPC of a retractable zoom lens barrel is mounted. It is sectional drawing which shows the direction of the force applied to aperture_diaphragm | restriction / shutter / anti-vibration FPC when the retractable zoom lens barrel is changed from the TELESCOPE state to the retracted state. It is sectional drawing which shows the direction of the force applied to a diaphragm, a shutter, and anti-vibration FPC, and the state which the aperture / shutter / anti-vibration FPC is turned. It is sectional drawing which shows scooping of FPC in the retracted state of the retractable zoom lens barrel which concerns on a prior art example.

Explanation of symbols

101, 102 1st group lens 103 2nd group lens 104 3rd group lens 105 CCD
203 2nd group holder 205 CCD holder 302 Moving cam cylinder 303 Fixed cam cylinder 303a Cam groove 303b Through cam hole 303c FPC guide groove 303d FPC escape hole 303e FPC hole 306 FPC for diaphragm / shutter / anti-vibration drive

Claims (3)

In a lens barrel that includes an image pickup element that is disposed at an end opposite to the subject side in the optical axis direction and picks up an image of the subject,
A holding member that holds a lens that forms an optical image of a subject on the image sensor and in which an electrical component is disposed;
A moving member arranged concentrically outside the holding member and configured to be movable in the optical axis direction, and moving the holding member in the optical axis direction;
A fixing member that is concentrically disposed outside the moving member and is fixed to a base portion that holds the imaging element, and has a cam groove that engages the moving member so that the moving member can move in the optical axis direction;
Wired from the holding member along at least a part of each of the base, the moving member, and the fixed member that holds the imaging device, and electrically connects the electric component and a control unit outside the lens barrel. A flexible printed circuit board to be connected,
The fixing member further includes a guide groove for guiding the flexible printed circuit board extended from the holding member, and a discharge hole for discharging the flexible printed circuit board guided by the guide groove to the outside of the lens barrel. Have
The lens barrel according to claim 1, wherein the discharge hole of the fixing member has a width larger than that of the guide groove in a direction intersecting a wiring direction of the flexible printed circuit board.   The lens barrel according to claim 1, wherein the discharge hole of the fixing member is formed in a shape having a certain width in the optical axis direction.   2. The lens barrel according to claim 1, wherein the discharge hole of the fixing member is formed in a shape that increases in width toward the base portion that holds the imaging element in the optical axis direction.

Images