JP2011158725A - Lens barrel and optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the breakage of a flexible printed circuit board while suppressing an increase of the number of components, and to prevent an adverse effect of noise on electrical components. <P>SOLUTION: A lens barrel includes: a barrel member for housing a lens; the flexible printed circuit board arranged outside the barrel member; a shield member having conductivity which is arranged so as to cover at least a part of the flexible printed circuit board at the opposite side of the barrel member of the flexible printed circuit board; the electrical components arranged at a side opposite to the flexible printed circuit board in the shield member; and a moving member that moves with respect to the barrel member at the side opposite to the flexible printed circuit board in the shield member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present case relates to a lens barrel and an optical apparatus.

  Conventionally, in an electronic device, wiring, a flexible printed circuit board, etc. are used in order to electrically connect between electrical components (refer to patent documents 1 etc.). In patent document 1, while providing a reinforcement member between a display panel and the flexible printed circuit board connected to the said display panel, while preventing damage to a display panel, sandwiching a flexible printed circuit board with a metal frame, A technique for making a flexible printed circuit board resistant to noise and unwanted radiation has been proposed.

JP 2007-279768 A

  However, in the technique disclosed in Patent Document 1, for example, when there is a member that moves in the electronic device, the flexible printed circuit board may be damaged due to mechanical interference between the moving member and the flexible printed circuit board. Moreover, if a member for preventing the breakage is added, the number of parts increases, and there is a possibility that the device becomes complicated and heavy.

  Accordingly, the present invention has been made in view of the above problems, and a lens barrel capable of reducing the damage of the flexible printed circuit board while suppressing the increase in the number of components and suppressing the influence of noise on the electrical components. The purpose is to provide. It is another object of the present invention to provide an optical apparatus that can perform high-precision control and can suppress the occurrence of a failure.

  The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although it attaches | subjects and demonstrates the code | symbol corresponding to drawing which shows one Embodiment of this invention, it is not limited to this.

  The lens barrel of the present invention includes a cylindrical member that houses a lens therein, a flexible printed circuit board provided outside the cylindrical member, and the flexible printed circuit board on a side opposite to the cylindrical member of the flexible printed circuit board. A conductive shielding member provided so as to cover at least a part thereof, an electrical component provided on the opposite side of the shielding member from the flexible printed circuit board, and the flexible printed circuit board of the shielding member. And a moving member that moves on the opposite side with respect to the tube member.

  In this case, a through-hole through which the flexible printed board passes is formed in the peripheral wall of the cylindrical member, and the shield member is partially engaged with the through-hole, and at least the flexible printed board It may be fixed to the cylinder member so as to cover a portion in the vicinity of the through hole. In this case, the flexible printed circuit board is inserted into the through hole from the outer peripheral side of the cylindrical member, and is folded back in the vicinity of the through hole, and the moving member is in the vicinity of the through hole with respect to the cylindrical member. It may be moved.

  In the present invention, the electrical component can be at least one of a magnetic sensor and an angular velocity sensor. The flexible printed circuit board may be connected to at least one of a camera shake correction unit, an aperture unit, a focus unit, and a zoom unit, at least a part of which is provided inside the cylindrical member. Moreover, the said shield member can be connected to the part which has the electroconductivity of the said cylindrical member.

  The optical apparatus of the present invention includes the lens barrel of the present invention.

  The lens barrel according to the present invention has the effect of reducing the damage of the flexible printed circuit board while suppressing the increase in the number of components and suppressing the influence of noise on the electrical components. In addition, the optical apparatus according to the present invention has an effect that high-precision control is possible and occurrence of failure can be suppressed.

It is a figure showing roughly the composition of the imaging device concerning one embodiment. It is a partial sectional view of a lens barrel. It is the figure which looked at the shield member vicinity from the + Z direction. It is a perspective view which shows a shield member, an interlocking ring, and the focus key vicinity. It is a figure which shows a modification.

  Hereinafter, an embodiment of a lens barrel and an optical device will be described in detail with reference to FIGS. FIG. 1 schematically shows an imaging apparatus 200 according to the present embodiment. The imaging apparatus 200 of the present embodiment is a single-lens reflex digital camera, and includes an imaging apparatus body 100 and a lens barrel 10. In the following, the optical axis direction of the lens included in the lens barrel 10 is defined as the Y-axis direction, and the directions orthogonal to the Y-axis direction are defined as the X-axis direction and the Z-axis direction.

  The imaging apparatus main body 100 captures an image connected by a lens included in the lens barrel 10. Note that the internal configuration of the imaging apparatus main body 100 is the same as that of a known single-lens reflex digital camera, and a detailed description thereof will be omitted.

  FIG. 2 is a partial cross-sectional view of the lens barrel 10. As shown in FIG. 2, the lens barrel 10 has a first group lens L1, a second group lens L2, a third group lens L3, a fourth group lens L4, and a fifth group lens L5 arranged on a common optical axis AX. . The lens barrel 10 includes a fixed barrel 30, a first group lens sliding cylinder 11 that holds the first group lens L1, a second group lens sliding cylinder 12 that holds the second group lens L2, a third group lens L3, and A third and fifth group lens sliding cylinder 13 holding the fifth group lens L5 and a fourth group lens sliding cylinder 14 holding the fourth group lens L4 are provided.

  The fixed cylinder 30 includes an outer fixed cylinder 30a and an inner fixed cylinder 30b. The inner fixed cylinder 30 b is formed of a conductive material (metal) and is fixed to the outer fixed cylinder 30 a and the mount 31 with screws 39. The mount 31 and the screw 39 are also made of a conductive material. A main board 54 is provided between the outer fixed cylinder 30a and the inner fixed cylinder 30b.

  The first group lens sliding cylinder 11 is connected to a zoom drive cylinder 16 provided inside the first group lens sliding cylinder 11 so as to be interlocked. The zoom driving cylinder 16 rotates in conjunction with the rotation of the zoom operation ring 18 located on the outermost peripheral portion of the lens barrel 10, and the rotation of the first lens group sliding cylinder 11 in the front-rear direction (in the optical axis AX). (Direction along). The zoom operation ring 18 is rotated by the user during zooming.

  The second group lens sliding cylinder 12 is connected to an interlocking ring 32 provided outside the second group lens sliding cylinder 12 so as to be interlocked. A focus key 52 is engaged with a part of the interlocking ring 32 (see FIG. 4). The focus key 52 moves in the rotation direction around the optical axis AX by the rotation of the focus ring 37 located on the outermost peripheral portion of the lens barrel 10 or the rotation of the built-in motor. In conjunction with the movement of the focus key 52, the interlocking ring 32 moves in the front-rear direction while rotating around the optical axis AX. In conjunction with the movement of the interlocking ring 32, the second lens group sliding cylinder 12 and the second lens group L2 move in the front-rear direction without rotating. The interlocking ring 32 also moves in the front-rear direction when receiving a rotational force when the zoom operation ring 18 is rotated by the user. That is, the second group lens sliding cylinder 12 and the second group lens L2 move in the front-rear direction without rotating even when the zoom operation ring 18 is rotated.

  The third and fifth group lens sliding cylinders 13 hold the third group lens L3 and the fifth group lens L5 at a predetermined interval in the optical axis AX direction. A diaphragm mechanism 35 is provided at the + Y end of the third and fifth group lens sliding cylinder 13.

  The fourth group lens sliding cylinder 14 is provided in the internal space of the third and fifth group lens sliding cylinder 13. The fourth group lens sliding cylinder 14 holds the fourth group lens L4 via three voice coil motors 33 constituting a part of the camera shake correction unit. The fourth group lens L4 is driven in the XZ plane by the voice coil motor 33.

  Although not shown, the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 engage with cam grooves formed in cam rings 20 provided outside the sliding cylinders 13 and 14, respectively. is doing. The cam ring 20 receives a rotational force when the zoom drive cylinder 16 is rotated by the rotation of the zoom operation ring 18. Thereby, the cam ring 20 moves in the front-rear direction while rotating. The third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 move in the front-rear direction without rotating in conjunction with the operation of the cam ring 20. The movement amounts of the third and fifth group lens sliding cylinders 13 and the fourth group lens sliding cylinder 14 are different.

  According to the lens barrel 10 described above, during zooming, each of the first to fifth group lenses L1 to L5 has a different distance in the forward direction as the zoom operation ring 18 rotates (however, the lenses L3 and L5 are the same). (Distance). At the time of focusing, only the second group lens L2 moves in the front (rear) direction in accordance with the rotation of the focus ring 37 or the rotation of the built-in motor.

  The main board 54 includes an IC (integrated circuit) and a gyro sensor (angular velocity sensor) 56 that constitutes a part of a camera shake correction unit, and performs various controls in the lens barrel 10. One end of a flexible printed circuit board 58 is connected to the main board 54. The other end side of the flexible printed circuit board 58 is introduced from the outside of the inner fixed cylinder 30b to the inner side of the inner fixed cylinder 30b through a through hole 130 formed in the peripheral wall of the inner fixed cylinder 30b. The other end side of the flexible printed board 58 is connected to a coil (stator) of the voice coil motor 33. The flexible printed board 58 is folded back in the vicinity of the through hole 130. In practice, as shown in the perspective view of FIG. 4, the portion of the flexible printed circuit board 58 that is located outside the inner fixed cylinder 30b is embedded in a concave groove 230 formed on the outer peripheral surface of the inner fixed cylinder 30b. It is in the state.

  Returning to FIG. 2, a conductive shield member 60 is provided on the + Z side of the flexible printed circuit board 58 (on the opposite side to the direction in which the inner fixed cylinder 30 b exists) so as to cover the flexible printed circuit board 58. As can be seen from FIG. 3 showing the state in which the vicinity of the shield member 60 is viewed from the + Z direction, the shield member 60 has a thin plate shape (a shape in which the thickness in the Z axis direction is thin) having the Y axis direction as the longitudinal direction. Yes. The width in the X-axis direction is set wide at the −Y end of the shield member 60 in accordance with the shape of the flexible printed circuit board 58. The main board 54 described above is provided on the + Z side of the flexible printed board 58 as shown in FIG. For this reason, the gyro sensor 56 mounted on the main board 54 is also provided on the + Z side of the flexible printed board 58.

  The shield member 60 has a + Y end inserted into a through-hole 130 formed in the peripheral wall of the inner fixed cylinder 30b, and a -Y end is screwed to the inner fixed cylinder 30b with a screw 62. The inner fixed cylinder 30b is fixed. By this fixing, the shield member 60 can suppress the floating and peeling of the flexible printed circuit board 58. As shown in FIG. 4, in practice, the shield member 60 is provided in a recessed groove 230 formed in the inner fixed cylinder 30b, and the + Z surface of the shield member 60 and the + Z surface of the inner fixed cylinder 30b. The ends are substantially flush.

  Here, the shield member 60, the inner fixed cylinder 30b, the screw 39, and the mount 31 are all formed of a conductive material (metal) as described above. For this reason, in this embodiment, it can be said that the conduction | electrical_connection between the shield member 60 and the mount 31 is taken.

  Next, the operation of the shield member 60 will be described. In the present embodiment, the shield member 60 is interposed between the focus key 52 and the interlocking ring 32 and the flexible printed board 58 as shown in FIG. Thereby, as shown in FIG. 4, even when the focus key 52 and the interlocking ring 32 move on the flexible printed circuit board 58 (+ Z side), the machine between the focus key 52 and the interlocking ring 32 and the flexible printed circuit board 58 Interference is suppressed by the shield member 60. In this case, even when the fourth group lens L4 or the like moves due to zooming or the like and the flexible printed circuit board 58 moves, the shield member 60 substantially covers the + Z surface of the portion located outside the inner fixed cylinder 30b of the flexible printed circuit board 58. Since the entire surface is held down, the floating and peeling of the flexible printed circuit board 58 can be effectively suppressed.

  Further, since the shield member 60 is interposed between the main board 54 (gyro sensor 56) and the flexible printed board 58, the influence of the current flowing through the flexible printed board 58 on the main board 54 (gyro sensor 56) ( Noise) can be suppressed. This is because the shield member 60 is formed of a conductive material (metal), and the shield member 60 is electrically connected to the mount 31 and is grounded (GND) to the imaging device main body 100 side. . As a result, the measurement accuracy of the gyro sensor 56 can be prevented from deteriorating due to noise, so that the camera shake correction can be performed with high accuracy.

  As described above in detail, according to the lens barrel 10 of the present embodiment, the inner fixed tube 30b that accommodates the lenses (L3, L4, L5) therein, and the flexible provided outside the inner fixed tube 30b. Since the printed circuit board 58 and the conductive shield member 60 provided so as to cover at least a part of the flexible printed circuit board 58 on the opposite side of the inner fixed cylinder 30b of the flexible printed circuit board 58 are provided, Even when the moving member (the interlocking ring 32 and the focus key 52) moves relative to the inner fixed cylinder 30b on the side opposite to the flexible printed board 58 of the shield member 60, the damage of the flexible printed board 58 can be reduced. And an electrical component (main board 54) on the opposite side of the shield member 60 from the flexible printed board 58. Even when the gyro sensor 56) is provided, it is possible to suppress the influence of the current flowing through the flexible printed circuit board 58 (noise) to the electrical component. Thus, since the influence of the moving member and the electric component on the flexible substrate can be avoided with one component called the shield member 60, the flexibility of the arrangement of the flexible printed circuit board 58, the moving member and the electric component is improved. As a result, the degree of freedom in designing the lens barrel 10 is increased, and it is possible to reduce the size and the like. Further, since the shield member 60 fixes the flexible printed circuit board 58 so as to be pressed against the inner fixed cylinder 30b, it floats more than when the flexible printed circuit board 58 is fixed to the inner fixed cylinder 30b with a double-sided tape or an adhesive. The occurrence of peeling can be suppressed.

  Moreover, according to the imaging device 200 having the lens barrel 10 as described above, since the breakage of the flexible printed circuit board 58 is reduced, the occurrence of a failure can be suppressed. In addition, since the influence (noise, etc.) of the current flowing through the flexible printed circuit board 58 on the electrical component is suppressed, highly accurate sensing by the gyro sensor 56 is possible, and highly accurate control (for example, camera shake correction) is possible. .

  Further, according to the present embodiment, the through hole 130 through which the flexible printed circuit board 58 is passed is formed in the peripheral wall of the inner fixed cylinder 30b, and a part (+ Y end portion) of the shield member 60 is engaged with the through hole 130. In this state, the flexible printed board is fixed to the inner fixed cylinder 30b so as to cover at least a portion near the through hole 130. In this way, by engaging a part of the shield member 60 with the through-hole 130, the number of screw fixing positions of the shield member 60 can be reduced, so that the shield member 60 can be easily fixed to the inner fixed cylinder 30b. Become.

  In the present embodiment, the flexible printed circuit board 58 is inserted into the through hole 130 from the outer peripheral side of the inner fixed cylinder 30b and is folded back in the vicinity of the through hole 130, and the interlocking ring 32 and the focus key 52 are passed through. It is arranged to move relative to the inner fixed cylinder 30b in the vicinity of the hole 130. In the present embodiment, even when the interlock ring 32 and the focus key 52 move in the vicinity of the portion where the flexible printed circuit board 58 is likely to be lifted, the flexible printed circuit board 58 is damaged by the action of the shield member 60. There is no problem. That is, in the present embodiment, it can be said that the shield member 60 improves the degree of freedom of arrangement of the interlocking ring 32 and the focus key 52.

  In the above embodiment, a gyro sensor (angular velocity sensor) is employed as an electrical component. However, the present invention is not limited thereto, and a magnetic sensor may be employed as the electrical component. In the above-described embodiment, the case where the other end of the flexible printed circuit board 58 is connected to the camera shake correction unit (voice coil motor 33) has been described, but instead of or together with this, a diaphragm unit, a focus unit, And at least one of the zoom units.

  In the above-described embodiment, the case where the flexible printed circuit board 58 is pressed only by the shield member 60 has been described. However, the present invention is not limited to this, and the flexible printed circuit board 58 is covered with the shield member 60 as shown in FIG. Even the tape 70 having the property may cover a part of the flexible printed circuit board 58. The portion covered with the tape 70 is preferably a portion where the interlock ring 32 and the focus key 52 do not move on the + Z side.

  In the above-described embodiment, the case where the concave groove 230 is provided on the outer peripheral surface of the inner fixed cylinder 30b has been described. However, the present invention is not limited thereto, and the concave groove 230 is provided when there is a sufficient space for providing the shield member 60. It is good also as not providing. In the above embodiment, the shield member 60 is fixed to the inner fixed cylinder 30b in a state where the + Y end portion of the shield member 60 is inserted into the through hole 130. However, the present invention is not limited to this. The + Y end portion of the shield member 60 may be fixed to the inner fixed cylinder 30b by screwing or the like without being inserted into the through hole 130.

  The configuration of the lens barrel of the above embodiment is an example, and the present invention can be applied to other various lens barrels.

  Moreover, although the said embodiment demonstrated the case where an imaging device (single-lens reflex digital camera) was employ | adopted as an optical apparatus, it is not restricted to this. As the optical device, for example, a still camera, a video camera, a mobile phone, a telescope, or the like can be employed.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

30b Inner fixed cylinder 32 Interlocking ring 52 Focus key 54 Main board 56 Gyro sensor 58 Flexible printed circuit board 60 Shield member 130 Through hole L3, L4, L5 Lens

Claims (7)

A cylindrical member that houses a lens therein;
A flexible printed circuit board provided outside the cylindrical member;
A conductive shielding member provided on the opposite side of the flexible printed circuit board from the cylindrical member so as to cover at least a part of the flexible printed circuit board;
An electrical component provided on the opposite side of the shield member from the flexible printed circuit board;
A lens barrel, comprising: a moving member that moves relative to the cylindrical member on a side opposite to the flexible printed circuit board of the shield member. A through hole through which the flexible printed circuit board passes is formed in the peripheral wall of the cylindrical member,
The shield member is fixed to the cylindrical member so that a part of the shield member is engaged with the through hole and covers at least a portion near the through hole of the flexible printed circuit board. The lens barrel according to Item 1.   The flexible printed circuit board is inserted into the through hole from the outer peripheral side of the cylindrical member, is folded back in the vicinity of the through hole, and the moving member moves relative to the cylindrical member in the vicinity of the through hole. The lens barrel according to claim 2.   The lens barrel according to claim 1, wherein the electrical component is at least one of a magnetic sensor and an angular velocity sensor.   The flexible printed circuit board is connected to at least one of a camera shake correction unit, an aperture unit, a focus unit, and a zoom unit, at least a part of which is provided inside the cylindrical member. The lens barrel as described in any one of -4.   The lens barrel according to claim 1, wherein the shield member is connected to a conductive portion of the cylindrical member.   An optical apparatus comprising the lens barrel according to any one of claims 1 to 6.

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