JP5335337B2 - Lens barrel and imaging device - Google Patents

Description

The present invention relates to an imaging apparatus provided with lenses barrel及beauty lenses barrel.

  A conventional zoom lens barrel disclosed in Patent Document 1 is rotatably fitted to a drive ring 1, a fixed cylinder 1, a differential cylinder 3 fitted inside the fixed cylinder 2, and an inner peripheral portion of the differential cylinder 3. A straight guide 4 that is held together is provided. Further, the zoom lens barrel includes a drive pin 5 that passes through the rectilinear groove 1 a of the drive ring 1 and the groove 2 b of the fixed cylinder 2 and is screwed into the screw hole 3 b of the differential cylinder 3.

The zoom lens barrel is provided with a protrusion 5a that engages with the circumferential groove 4a of the linear guide 4 at the screw tip of the drive pin 5 so as to prevent the linear guide 4 from coming off. Yes.
Patent No. 3008741

  However, in the above conventional example, the projecting portion 5a that engages with the circumferential groove 4a of the rectilinear guide 4 is provided at the screw tip portion of the drive pin 5, and the rectilinear guide 4 is prevented from coming off. A radial space is required. Therefore, there has been a problem that the lens barrel diameter becomes large.

An object of the present invention, without increasing the rectilinear barrel radially to provide an optical axis direction Relais lens barrel relative movement can regulate the and the imaging apparatus of the rectilinear barrel and the cam barrel.

To achieve the above object, lenses barrel according to claim 1, wherein the plurality of lens groups, the cam barrel cam groove for moving the plurality of lens groups in the optical axis direction is formed, the A rectilinear cylinder that guides the plurality of lens groups linearly in the optical axis direction. The rectilinear cylinder is disposed on the inner periphery of the cam cylinder so as to be relatively rotatable, and the plurality of lens groups are moved by the rotation of the cam cylinder. in, Relais lens barrel, wherein a flange portion of the rectilinear barrel, the stopper and the member to be engaged is sandwiched engagement portion of the straight barrel and an end face of the cam barrel, the rectilinear barrel and the cam barrel Relative protrusion in the optical axis direction is restricted, and the protrusions extending in the optical axis direction from the retaining member engage with the recesses formed on both sides of the notch formed in the rectilinear cylinder. and wherein that you are.

  An imaging apparatus according to a third aspect includes the zoom lens barrel according to the first aspect.

  According to the zoom lens barrel of the present invention, the relative movement of the rectilinear cylinder and the cam cylinder in the optical axis direction can be restricted without enlarging the rectilinear cylinder in the radial direction.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

1A, 1B, 1 C is an exploded perspective view of a zoom lens barrel according to an embodiment of the present invention, respectively.

  The zoom lens barrel is provided in an imaging apparatus.

(Group 1 component 100)
Figure 2 is a perspective view from FIG. 1 A and the opposite side of the first group component 100 of FIG. 1 A.

The first group component unit 100 includes a first group lens 102 (FIG. 1A ) and a first group cylinder 102 that holds the first group lens 101. In the first group cylinder 102, six rectilinear guide recesses 102a are formed on the inner peripheral side. Six cam pins 103 are fixed to the first group cylinder 102 by 60 ° equally. The front opening member 104 is fixed to the tip of the first group cylinder 102.

(Second group component 200)
The second group component 200 includes a second group cylinder 202 that holds the second group lens 201 and the second group lens 201. In the second group cylinder 202, cam followers 202a are formed at three positions equally divided by 120 °, and rectilinear guide convex portions 202b are formed at three positions equally divided by 120 °.

(3 group component 300)
The third group constituent unit 300 includes a third group holding member 302 that holds the third group lens 301 and the third group lens 301. The third group drive unit 303 is provided with a drive mechanism (a drive mechanism is not shown) for driving the third group holding member 302 in a direction perpendicular to the optical axis by a known technique.

  In the third group drive unit 303, cam followers 303a are formed at three locations at 120 ° equally, and rectilinear guide convex portions 303b are formed at three locations at 120 ° equally. An aperture / shutter unit (drive mechanism not shown) 304 is fixed to the third group drive unit 303.

(Four-group component 400)
Figure 3 is a perspective view from FIG. 1 B and the opposite side of the four-group configuration section 400 in FIG. 1 B.

  The fourth group component 400 includes a fourth group lens 401, a fourth group holding member 402 that holds the fourth group lens 401, and a fourth group cylinder (first rectilinear cylinder) 403.

  In the fourth group cylinder 403, cam followers 403a are formed at three locations at 120 ° equally, and rectilinear guide recesses 403b are formed at three locations at 120 ° equally on the outer peripheral side surface.

  The fourth group cylinder 403 has a flange portion 403c formed on the outer peripheral side. On the outer peripheral side of the flange portion 403c, three main straight key portions 403d are formed at 120 ° equally in the circumferential direction, and three sub straight key portions 403e having different key widths are formed in the circumferential direction. A drive mechanism (focus group drive mechanism) for the fourth group holding member 402 is provided on the inner peripheral side of the fourth group cylinder 403.

  Here, the configuration of this drive mechanism will be described.

Figure 4 is an exploded perspective view of a four-group configuration section 400 in FIG. 1 B.

The main guide member 404 is fitted with the main guide portion 402 a of the fourth group holding member 402. A screw 405 a is formed on the rotating shaft of the stepping motor 405. In the fourth group cylinder 403, a flange portion 403f is formed on the inner peripheral side, and the stepping motor 405 and the main guide member 404 are fixed.

  The fourth group cylinder 403 is formed with a sub guide convex portion 403g, and the sub guide portion 402c of the fourth group holding member 402 is fitted therein. The nut member 406 is held by the nut holding portion 402b of the fourth group holding member 402 and meshes with the screw 405a.

  The spring member 407 is hung on the hook portion 402 d of the fourth group holding member 402 and the hook portion 403 h of the fourth group cylinder 403.

  With this configuration, when the stepping motor 405 is energized and the screw 405a rotates, the nut member 406 and the fourth group holding member 402 are moved in the optical axis direction.

(Zoom component 500)
In the zoom component 500, the cam cylinder 501 is formed with cam grooves 501a for engaging the six cam pins 103 fixed to the first group cylinder 102 on the outer peripheral side, equally divided by 60 °.

  On the inner peripheral side of the cam cylinder 501, a cam groove 501b for engaging the cam follower 202a of the second group cylinder 202 and a cam groove 501c for engaging the cam follower 303a of the third group drive unit 303 are equally divided by 120 °. Is formed. Similarly, a cam groove 501d for engaging the cam follower 403a of the fourth group cylinder 403 is formed on the inner peripheral side of the cam cylinder 501 at an equal interval of 120 °.

  The cam cylinder 501 is formed with three cam followers 501e at 120 ° equally, and three driving pins 501f and claw portions 501g at 120 ° equally on the outer peripheral side.

Figure 5 is a developed view of the cam cylinder 501 in FIG. 1 B, a (a) the outer surface development view, (b) the inner surface development view.

  As shown in FIG. 5, the cam grooves 501b and 501c are formed continuously.

  When assembling, first, the third group drive unit 303 is introduced from the introduction portion 501h, rotated by 120 °, and then the second group cylinder 202 is introduced.

  The rectilinear cylinder (second rectilinear cylinder) 502 is disposed on the inner peripheral side of the cam cylinder 501. The rectilinear cylinder 502 has three rectilinear guide protrusions 502a equally divided by 120 ° on the inner peripheral side thereof, and engages with the rectilinear guide recess 403b of the fourth group cylinder 403 (first rectilinear cylinder). You will be guided straight ahead.

  Further, the straight tube 502 is formed with a flange portion 502b, and six first group straight guide convex portions 502c that engage with the straight guide concave portion 102a of the first group tube 102 are provided in the circumferential direction, and the outer peripheral side of the flange portion 502b. Is formed.

  Further, in the rectilinear cylinder 502, rectilinear grooves 502d and 502e that engage with the rectilinear guide protrusions 202b of the second group cylinder 202 and the rectilinear guide protrusions 303b of the third group driving unit 303 are formed in three portions at 120 ° equally. Has been.

Figure 6 is an exploded perspective view showing the relationship between the first group cylinder 102,4 group barrel 403 in a state where the rectilinear barrel 502 2 group barrel 202,3 group drive unit 303 is assembled in FIG 1 B. Figure 7 is a rectilinear tube 502 inside of the cam barrel 501 is assembled in FIG. 1 B, is a perspective view showing a state where the stopper member 503 is attached omission. Figure 8 is a rectilinear tube 502 inside of the cam barrel 501 is assembled in FIG. 1 B, a cross-sectional view showing a state where the stopper member 503 is attached omission. Figure 9 is a inner surface development view of the fixed barrel 505 in FIG 1 C. FIG. 10 is a perspective view showing the relationship between the fixed cylinder 505, the fourth group cylinder 404, and the cam cylinder 501 in FIGS. 1B and 1C .

  The retaining member 503 is locked by the end surface of the cam cylinder 501 and the locking portions 502 f formed at three locations in the circumferential direction of the linear cylinder 502 in a state where the linear cylinder 502 is incorporated inside the cam cylinder 501. The In this locked state, the cam cylinder 501 and the rectilinear cylinder 502 are integrated so as to be relatively rotatable.

  Further, the retaining member 503 has three bent portions 503a and 503b in the optical axis direction in the circumferential direction. The standing bent portions 503a and 503b are engaged with concave portions 502h and 502i provided on both sides of the notch portion 502g formed at three locations in the circumferential direction of the rectilinear cylinder 502, respectively.

  The decorative cylinder 504 is provided with three holes 504a equally divided by 120 ° for engagement with the claw 501g of the cam cylinder 501.

  The fixed cylinder 505 is formed with a cam groove 505a for engaging the cam follower 501e and a through cam hole 505b for penetrating the drive pin 501f.

  The fixed cylinder 505 is formed with three main rectilinear grooves 505c for engaging the main rectilinear key portions 403d of the fourth group cylinder 403 at three equal portions of 120 °. In addition, the fixed cylinder 505 is formed with three sub-straight grooves 505d having different groove widths for engaging the sub-linear keys 403e at three locations in the circumferential direction.

  The main rectilinear groove 505c and the sub rectilinear groove 505d are formed without straddling the cam groove 505a and the through cam hole 505b.

In Figure 1 C, the inner peripheral surface of the drive cylinder 506, the drive pin 501f and the optical axis direction of the driving groove 506a for engagement is formed at three positions at 120 ° equal. A gear portion 506b is formed on the outer periphery.

Further, as shown in FIG. 1 C, the zoom component 500 includes a base member 507, the image pickup device (CCD) 508 which is attached to the base member 507, the gear member 509. The gear member 509 meshes with the gear portion 506b. The cover member 510 is fixed to the base member 507 in such a manner that the fixed cylinder 505 and the drive cylinder 506 are sandwiched between the base members 507.

(Zoom operation)
The operation of the zoom lens barrel configured as described above will be described.

FIG. 11 shows the movement trajectory of the plurality of lens groups and the first to fourth lens groups (101, 201, 301, 401) in the zoom lens barrel of FIGS. 1A to 1C , to the WIDE state and the TELE state. FIG. 12 is a cross-sectional view of the zoom lens barrel of FIGS. 1A to 1C in a stored state. 13 is a cross-sectional view of the zoom lens barrel of FIGS. 1A to 1C in the WIDE state. FIG. 14 is a cross-sectional view of the zoom lens barrel of FIGS. 1A to 1C in the TELE state.

  When the gear 509 is rotated from a drive source (not shown), the drive is transmitted to the gear portion 506b and the drive cylinder 506 is rotated. Then, it is transmitted to the drive pin 501f that penetrates the through cam hole 505b of the fixed cylinder 505 and engages with the drive groove 506a, and the cam cylinder 501 rotates.

  At this time, the cam follower 501e is engaged with the cam groove 505a of the fixed cylinder 505, and the cam cylinder 501 moves in the optical axis direction while rotating along the locus of the cam groove 505a.

  As described above, the rectilinear cylinder 502 on the inner peripheral side of the cam cylinder 501 is integrated with the retaining member 503 being engaged with the engaging portion 502f, and moves in the optical axis direction.

  Here, in the fourth group cylinder 403, the cam follower 403 a is engaged with the cam groove 501 d of the cam cylinder 501. Further, the main rectilinear key portion 403d and the sub rectilinear key portion 403e engage with the main rectilinear groove 505c and the sub rectilinear groove 505d of the fixed cylinder 505, respectively, so that the rotation is restricted. Therefore, the fourth group cylinder 403 moves straight in the optical axis direction along the locus of the cam groove 501d.

  The rectilinear cylinder 502 is restricted in rotation by the rectilinear guide protrusion 502 a engaging with the rectilinear guide recess 403 b of the fourth group cylinder 403, and linearly moves in the optical axis direction by the locus of the cam groove 505 a of the fixed cylinder 505. .

  In the third group drive unit 303, the cam follower 303 a is engaged with the cam groove 501 c of the cam cylinder 501, and the rectilinear guide protrusion 303 b is engaged with the rectilinear guide 502 e of the rectilinear cylinder 502, so that the rotation is restricted. It moves straight in the optical axis direction along the locus of the cam groove 501c.

  In the second group cylinder 202, the cam follower 202 a is engaged with the cam groove 501 b of the cam cylinder 501. Further, the rectilinear guide convex portion 202b is engaged with the rectilinear guide 502d of the rectilinear cylinder 502 and is restricted in rotation, and the second group cylinder 202 moves linearly in the optical axis direction along the locus of the cam groove 501b.

  In the first group cylinder 102, the cam pin 103 is engaged with the cam groove 501 a of the cam cylinder 501. Further, the rectilinear guide recess 102a engages with the first group rectilinear guide convex portion 502c of the rectilinear cylinder 502, and the rotation of the first group cylinder 102 is linearly moved along the locus of the cam groove 501a. .

  As described above, the first to fourth group lenses (101, 201, 301, 401) move along the locus of the solid line in FIG. 11, and are stored (FIG. 12), WIDE (FIG. 13), and TELE (FIG. 14). It becomes.

(Operation within 4 groups)
As described above, the drive mechanism for the fourth group holding member 402 is provided and can be driven independently of the zoom operation described above.

  A solid line a in FIG. 11 is a predetermined locus of the fourth group lens 401. A broken line b in FIG. 11 is a trajectory in which the fourth group lens 401 moves in the above-described zoom operation (combined trajectory of the cam groove 505a of the fixed cylinder 505 and the cam groove 501d of the cam cylinder 501).

  The difference c between the predetermined locus solid line a and the zoom operation locus broken line b is absorbed by moving the fourth group holding member 402 by the driving mechanism of the fourth group holding member 402 described above, and becomes a predetermined locus of the solid line a.

  As described above, the zoom operation of the first to fourth group lenses (101, 201, 301, 401) is performed. Thereafter, the stepping motor 405 is energized as necessary, and the fourth group holding member 402 is moved in the optical axis direction to perform a focusing operation.

  As described above, the rectilinear cylinder 502 (second rectilinear cylinder) which is the rectilinear guide member of the first to fourth group components (100, 200, 300, 400) is replaced with the fourth group cylinder 403 (first rectilinear cylinder). It is configured to guide straight ahead.

  Then, a cam follower 403a is formed in the fourth group cylinder 403 (first straight cylinder) and is engaged with the cam groove 501d of the cam cylinder 501, and the fourth group cylinder 403 is moved in the optical axis direction by the locus of the cam groove 501d. I try to let them.

  Accordingly, the amount of movement of the fourth group cylinder 403 in the optical axis direction is reduced, and the main rectilinear groove 505c and the sub rectilinear groove 505d of the fixed cylinder 505 are formed without straddling the cam groove 505a and the through cam hole 505b. Has been.

  In the fourth group cylinder 403, a flange portion 403c is formed on the outer peripheral side, and a flange portion 403f is formed on the inner peripheral side, so that the rigidity of the fourth group cylinder 403 is improved.

  As a result, the rotation restriction of the fourth group cylinder 403 and the fixed cylinder 505 and the deformation of the fourth group cylinder 403 during the rotation restriction of the rectilinear cylinder 502 and the fourth group cylinder 403 can be suppressed, and a stable zoom operation can be performed. .

  The retaining member 503 is locked to locking portions 502f formed at three locations in the circumferential direction of the rectilinear cylinder 502 in a state where the rectilinear cylinder 502 is incorporated on the inner peripheral side of the cam cylinder 501. Thereby, the cam cylinder 501 and the rectilinear cylinder 502 can be integrated so as to be relatively rotatable without enlarging the lens barrel in the radial direction (the cam cylinder 501 can be prevented from coming off).

  Recessed portions 503a and 503b formed at three locations in the circumferential direction of the retaining member 503 are recessed portions 502h and 502i respectively provided on both sides of the notch portions 502g formed at three locations in the circumferential direction of the rectilinear cylinder 502. Is engaged.

  This prevents deformation of the entire rectilinear cylinder 502 due to the notch 502g formed in the rectilinear cylinder 502 during the zoom operation and maintains rigidity, so that a stable zoom operation is possible.

  The movement of the fourth group lens 401 to an optical predetermined position (solid line a in FIG. 11) is performed by zooming (the combined locus of the cam groove 505a and the cam groove 501d) and 4 provided on the inner peripheral side of the fourth group cylinder 403. This is performed by the driving mechanism of the group holding member 402.

  Therefore, the length in the optical axis direction of the screw 405a can be shortened compared to the case where the drive mechanism for the fourth group holding member 402 is provided on the base member 507, and the space inside the barrel unit is not required.

1 is an exploded perspective view of a zoom lens barrel according to an embodiment of the present invention. 1 is an exploded perspective view of a zoom lens barrel according to an embodiment of the present invention. 1 is an exploded perspective view of a zoom lens barrel according to an embodiment of the present invention. It is a perspective view from the opposite side of the Figure 1 A of the first group component 100 of FIG. 1 A. Is a perspective view from FIG. 1 B and the opposite side of the four-group configuration section 400 in FIG. 1 B. It is an exploded perspective view of a four-group configuration section 400 in FIG. 1 B. Is a developed view of the cam cylinder 501 in FIG. 1 B. Figure 1 is an exploded perspective view showing the relationship between the first group cylinder 102,4 group barrel 403 in a state where the second group cylinders 202,3 group drive unit 303 is assembled to the rectilinear tube 502 in B. Rectilinear tube 502 inside of the cam barrel 501 is assembled in FIG. 1 B, is a perspective view showing a state where the stopper member 503 is attached omission. Rectilinear tube 502 inside of the cam barrel 501 is assembled in FIG. 1 B, a cross-sectional view showing a state where the stopper member 503 is attached omission. A inner surface development view of the fixed barrel 505 in FIG 1 C. It is a perspective view which shows the relationship between the fixed cylinder 505, the 4th group cylinder 40 3 , and the cam cylinder 501 in FIGS. 1B and 1C . FIGS. 1A to 1C are diagrams illustrating movement trajectories of the first to fourth group lenses (101, 201, 301, 401) in the zoom lens barrel of FIGS. 1A to 1C to a storage state, a WIDE state, and a TELE state. 1C is a cross-sectional view of the zoom lens barrel of FIGS. 1C is a cross-sectional view of the zoom lens barrel of FIGS. 1A to 1C in a WIDE state. FIG. 1C is a cross-sectional view of the zoom lens barrel of FIGS. 1A to 1C in a TELE state. FIG.

Explanation of symbols

100 First group component 101 First group lens 200 Second group component 201 Second group lens 300 Third group lens 301 Third group lens 301 Third group lens 400 Fourth group component 401 Fourth group lens 403 Fourth group cylinder (first straight cylinder)
500 zoom component 501 cam cylinder 502 rectilinear cylinder (second rectilinear cylinder)
502b Flange portion 502f Locking portion 502h, 502i Recess 503 Retaining member 503a, 503b Standing bent portion

Claims (4)

A plurality of lens groups;
A cam cylinder formed with a cam groove for moving the plurality of lens groups in the optical axis direction;
A rectilinear cylinder that linearly guides the plurality of lens groups in the optical axis direction,
Wherein said straight barrel to the inner periphery of the cam barrel is relatively rotatably disposed in Relais lens barrel to move said plurality of lens by the rotation of the cam barrel,
The cam cylinder and the rectilinear cylinder are moved relative to each other in the optical axis direction by the flange portion of the rectilinear cylinder, the end surface of the cam cylinder and the retaining member that is sandwiched and locked by the engaging portion of the rectilinear cylinder. Regulated ,
Protrusion extending from said retainer member in the optical axis direction, the fact that engages a recess formed on both sides of the notch formed in the straight cylinder and wherein, Relais lens barrel . A holding cylinder for holding the lens group;
The said holding cylinder is provided with the protrusion part in which the cam follower engaged with the said cam groove was formed, and the protrusion part in which the said cam follower was formed has penetrated into the said notch part. Lens barrel. A holding cylinder for holding the lens group;
The holding cylinder is formed with a rectilinear guide recess, and the rectilinear cylinder is formed with a rectilinear guide protrusion that can be engaged with the rectilinear guide recess at a position different from the notch in the circumferential direction. The lens barrel according to claim 1, wherein: An imaging apparatus comprising: the lens barrel according to claim 1; and an imaging element .

Images