JP2019124720A - Lens device - Google Patents

Abstract

To provide a lens device that allows the adjustment of brushes to be easily performed and is excellent in impact resistance.SOLUTION: A lens device includes: a stationary member 102; a holder member 105 fixed relative to the stationary member 102; an operation ring 119 rotatably held relative to the holder member 105; a base member 109 held relative to the holder member 105 in a constant position rotatable manner; transmission means 121 for transmitting rotation of the operation ring 119 to the base member 109; and rotation detection means for detecting an amount of the rotation of the operation ring 119 by detecting rotation of the base member 109.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a lens apparatus capable of changing the lens position of a focus lens or the like by manual operation.

  2. Description of the Related Art Conventionally, in an imaging apparatus such as a digital camera or a video camera, a configuration is known in which the lens position of a focus lens or zoom lens of a lens barrel is changed according to rotation of an operation member by an electronic manual. Patent Document 1 has a brush attached to an operation member and an annular substrate attached to a fixing member, and the operation is performed based on a pulse signal acquired by sliding the brush on the annular substrate. A lens drive device is disclosed that detects the amount of rotation of a member. In Patent Document 2, a brush fixed to a focus connecting ring which is integrally rotated with an operation member and rotatably supported by a holding cylinder, and a flexible printed circuit board affixed to an encoder base fixed to the holding cylinder And a lens barrel is disclosed.

Unexamined-Japanese-Patent No. 10-82944 JP, 2013-228515, A

  In the lens driving device of Patent Document 1, since the brush is attached to the operation member, when an impact is applied to the operation member, the impact is directly transmitted to the brush, which may affect the pulse signal. In addition, since the pulse signal can not be obtained unless the operation member is rotated, the operation check can not be performed unless the operation member to which the brush is attached and the fixing member to which the annular substrate is attached are assembled. If there is a defect in the operation check, the assembled device has to be disassembled, and the number of assembling steps increases.

  In the lens barrel of Patent Document 2, when an impact is applied to the operation member, the brush receives no force in the angular direction, but receives a force in the optical axis direction. Moreover, although it can carry out in the state which the operation member is not assembled | attached regarding operation confirmation, since the brush is being fixed to the movable member side, adjustment work is difficult.

  An object of the present invention is to provide a lens apparatus which can easily carry out brush adjustment and is excellent in impact resistance.

  A lens device according to one aspect of the present invention includes a fixing member, a holder member fixed to the fixing member, an operation ring rotatably held with respect to the holder member, and the holder member. The rotation amount of the operation ring is detected by detecting the rotation of the base member, which is held against the fixed position rotatably, the transmission means for transmitting the rotation of the operation ring to the base member, and the rotation of the base member And rotation detection means.

  According to the present invention, it is possible to provide a lens apparatus which can easily carry out the adjustment of the brush and is excellent in impact resistance.

It is the schematic of an imaging device provided with the lens apparatus which concerns on embodiment of this invention. 1 is a cross-sectional view of an interchangeable lens that is an example of a lens apparatus according to an embodiment of the present invention. It is a sectional view of a rotation detecting device. It is an enlarged view of the broken line part of FIG. It is a perspective view of a rotation detector. It is a figure which shows the pattern of a cyclic | annular board | substrate. It is a figure which shows the state which the 1st brush and the 2nd brush contact the cyclic | annular board | substrate. It is a sectional view of a lens barrel. It is an enlarged view of the broken line part of FIG. It is a perspective view of a lens barrel.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same members are denoted by the same reference numerals, and redundant description will be omitted.

  FIG. 1 is a schematic view of an imaging device IA provided with a lens device LB according to an embodiment of the present invention. The lens device LB holds the imaging optical system IOS. The camera body CB holds an imaging element IE that receives subject light. The lens apparatus LB may be configured integrally with the camera body CB, or may be configured to be detachably attached to the camera body CB.

  FIG. 2 is a cross-sectional view of an interchangeable lens 10 which is an example of a lens apparatus according to an embodiment of the present invention. The interchangeable lens 10 is fitted to the lens barrel 101 and the lens holding frame (fixing member) 102 of the lens barrel 101, and is fixed to the focus unit 20, the fixed barrel 30, and the mount unit mounted to the camera body. And 40. When the interchangeable lens 10 is mounted on a camera body (not shown), lens driving is performed according to the mode in which autofocus is possible, the mode in which manual focusing is possible, and the mode in which autofocus is possible and the operation ring is operated. Is set to one of the following modes.

  The focus unit 20 includes a guide cylinder 21, a cam ring 22, an ultrasonic motor unit 23 for rotating the cam ring 22, a focus lens LF, and an aperture unit 24. When the cam ring 22 is rotated relative to the guide cylinder 21 by the ultrasonic motor unit 23, the focus lens LF is driven in a straight line to perform focus adjustment. Although the diaphragm unit 24 is included in the focusing unit 20 in this embodiment, the position is not limited to this because it depends on the interchangeable lens.

  The fixed barrel 30 has a shake correction unit 31, a fourth lens holding frame 37 for holding the fourth lens unit L4, and a substrate (rotation detection means) 38. The shake correction unit 31 drives the shift lens group LS held by the shift lens barrel 32 by the voice coil motor unit 33 configured of the drive magnet 34, the coil 35, and the yoke 36 to perform shake correction. The substrate 38 is connected to a flexible substrate and lead wires from various actuators and is connected to the contact unit 42, and exchanges signals with the camera body and supplies power.

  The mount unit 40 includes a mount 41 mounted on the camera body, a contact unit 42 incorporated in the mount 41, and a fixed outer ring 43 fitted in the lens holding frame 102 and fixing the mount 41. Have.

  FIG. 3 is a cross-sectional view of the lens barrel 101 (hereinafter referred to as the rotation detection device 100) before the operation ring 119 is incorporated. FIG. 4 is an enlarged view of a broken line in FIG. FIG. 5 is a perspective view of the rotation detection device 100. FIG.

  The rotation detection apparatus 100 has a lens holding frame 102 for holding the first lens unit L1, the second lens unit L2, and the third lens unit L3. The pressing rings 103a, 103b, and 103c are screwed with the surfaces of the first lens unit L1, the second lens unit L2, and the third lens unit L3, respectively, and the unshown screw portions provided on the lens holding frame 102. And a threaded portion. The first lens group L 1, the second lens group L 2, and the third lens group L 3 are fixed to the lens holding frame 102 by tightening the pressing rings 103 a, 103 b and 103 c in the lens holding frame 102.

  The outer ring 104 has a plurality of screw holes (not shown) extending along the optical axis, and holds the lens by screw fastening via a plurality of through holes (not shown) provided in the lens holding frame 102 It is fixed to the frame 102.

  The ring holder (holder member) 105 has a through hole 105a, and the ring holder locking screw 106 is fastened via the through hole 105a and a screw hole 102b extending along the optical axis provided in the lens holding frame 102. It is fixed to the lens holding frame 102 by this. That is, the ring holder 105 is radially fitted to the lens holding frame 102.

  The annular substrate unit 107 has an annular substrate 108 and an annular substrate base (base member) 109. As shown in FIG. 6, the conductive portion 108 a and the non-conductive portion 108 b are patterned on the annular substrate 108. The annular substrate 108 is fixed to the annular substrate base 109 by adhesion, for example. The fixed position rotation roller 110 is inserted into a roller hole 105 b provided in the ring holder 105, and engages with a circumferential groove 109 a provided in the annular substrate base 109. Thus, the annular substrate unit 107 is held rotatably relative to the ring holder 105 at a fixed position.

  The first brush unit 111 is configured by insert-molding the first brush 112 of the conductor on the first brush holding member 113 made of a resin material. The second brush unit 114 is configured by insert-molding the second brush 115 of the conductor on the second brush holding member 116 made of a resin material. The first brush 112 and the second brush 115 are connected to the flexible printed circuit board 117. The flexible printed circuit board 117 is connected to the board 38. The flexible printed circuit board 117 is connected to the unit inspection board at the time of inspection. In a state where the first brush unit 111 and the second brush unit 114 are connected to the flexible printed circuit board 117, the unfixed screw holes provided in the lens holding frame 102 are screwed with a brush set screw 118. Be done. Thereby, the first brush 112 and the second brush 115 contact the annular substrate 108 as shown in FIG.

  When the annular substrate unit 107 is rotated in place, the divided tips of the first brush 112 and the second brush 115 slide on the respective patterns formed on the annular substrate 108. The substrate 38 detects the amount of rotation of the annular substrate base 109 based on signals obtained by sliding the first brush 112 and the second brush 115 on the respective patterns formed on the annular substrate 108. . Since the annular substrate base 109 rotates integrally with the operation ring 119 when the operation ring 119 is operated as described later, the substrate 38 detects the amount of rotation of the annular substrate base 109 so as to rotate the operation ring 119. The amount can also be detected.

  In the present embodiment, when checking the signal output from the annular substrate 108, it is necessary to adjust the relative positional relationship between the brushes. When the relative position adjustment is performed, the annular substrate unit 107 is rotated at a fixed position. The fixed position rotation of the annular substrate unit 107 is performed by moving a tool pin inserted into the elongated hole 109 b provided in the annular substrate base 109. The tool pin may be moved manually or may be moved electrically by a tool. The fixed position rotation of the annular substrate unit 107 may be performed by grasping other places. When the annular substrate unit 107 is rotated in place, the divided tips of the first brush 112 and the second brush 115 slide on the respective patterns formed on the annular substrate 108. Relative position adjustment is performed based on signals obtained by sliding the first brush 112 and the second brush 115 on the respective patterns formed on the annular substrate 108.

  The first brush holding member 113 and the second brush holding member 116 are respectively disposed on flat portions 102 d and 102 e provided on the lens holding frame 102. The second brush holding member 116 has a projection (not shown) engaged with a guide groove 102 c provided in the lens holding frame 102. In the present embodiment, an adjustment mechanism capable of adjusting the relative position is configured by the guide groove portion 102 c and the protruding portion of the second brush holding member 116. By adjusting the position of the protrusion of the second brush holding member 116 with respect to the guide groove 102c, the position of the second brush unit 114 can be moved on the flat portion 102d. Thereby, the second brush unit 114 can be adjusted relative to the first brush unit 111. When the relative position adjustment is performed, the second brush unit 114 is preferably moved in a direction (first direction) orthogonal to the optical axis and the axial direction of an axial screw 121 described later. Also, in the present embodiment, the second brush unit 114 is moved relative to the first brush unit 111, but the first brush unit 111 is relatively moved to the second brush unit 114. You may move it. That is, relative position adjustment may be performed by moving at least one of the first brush unit 111 and the second brush unit 114 on a flat portion provided on the lens holding frame 102.

  The lens barrel 101 will be described with reference to FIGS. 8 to 10. FIG. 8 is a cross-sectional view of the lens barrel 101. As shown in FIG. FIG. 9 is an enlarged view of a broken line in FIG. FIG. 10 is a perspective view of the lens barrel 101. FIG.

  The rotation detection device 100 is incorporated into the operation ring 119 after the relative position adjustment described above. The focus roller 120 is inserted into the operation ring 119. The focusing roller 120 is in a slidable relationship along the operation ring circumferential groove 105 c provided in the ring holder 105. Thereby, the operation ring 119 can rotate in the fixed position with respect to the ring holder 105.

  The shaft screw (transmission means) 121 is screwed into a screw hole 119 a provided in the operation ring 119. An axial screw tip 121 a of the axial screw 121 is inserted into a long hole 109 b provided in the annular substrate base 109. Thus, when the operation ring 119 is rotated, the rotational force is transmitted to the annular substrate base 109 via the shaft screw 121, and the operation ring 119 and the annular substrate unit 107 integrally rotate. In the present embodiment, the elongated hole 109b into which the shaft screw tip 121a is inserted extends along the optical axis. Therefore, the shaft screw tip portion 121a can be inserted into the long hole 109b even if some variation occurs due to a manufacturing error or the like. Further, since the operating ring 119 does not extend in the rotational direction, the rotational force is transmitted to the annular substrate base 109 without delay. In the present embodiment, the ring holder 105 for holding the annular substrate unit 107 is fitted to the lens holding frame 102 in diameter. Therefore, only the force in the rotational direction of the operation ring 119 is transmitted to the annular substrate unit 107. Therefore, assembly of the interchangeable lens 10 can be performed with high accuracy. Further, in the present embodiment, since the rotational force is transmitted by only one shaft screw 121, the cost can be suppressed.

  As described above, according to the configuration of the present embodiment, since the second brush unit 114 can be adjusted with respect to the first brush unit 111 without attaching the operation ring 119, high workability can be obtained. . Further, even when the operation ring 119 receives an impact from the outside, the energy transmitted from the operation ring 119 to the annular substrate 108 is only in the rotational direction, so the relative position of the second brush unit 114 to the first brush unit 111 There is no influence of Therefore, the present invention can provide a lens apparatus which can easily carry out the adjustment of the brush and is excellent in impact resistance.

  As mentioned above, although the preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

10 Interchangeable Lens (Lens Device)
38 Substrate (rotation detection means)
101 Lens Barrel 102 Lens Holding Frame (Fixing Member)
105 Ring holder (holder member)
119 Operation ring 121 Shaft screw (transmission means)

Claims (11)

A fixing member,
A holder member fixed to the fixing member;
An operation ring rotatably held relative to the holder member;
A base member rotatably held in place relative to the holder member;
Transmission means for transmitting the rotation of the operation ring to the base member;
And a rotation detection unit configured to detect a rotation amount of the operation ring by detecting a rotation of the base member.   The said rotation detection means performs rotation detection based on the signal acquired by sliding a brush with respect to the cyclic | annular board | substrate with which the conduction part and the non-conduction part are patterned, It is characterized by the above-mentioned. Lens device. The annular substrate is fixed to the base member,
The lens apparatus according to claim 2, wherein the brush is fixed to the fixing member.   The lens apparatus according to claim 2 or 3, wherein two brushes are provided.   5. The lens apparatus according to claim 4, further comprising an adjustment mechanism capable of adjusting the relative position of the two brushes.   6. The lens apparatus according to claim 5, wherein the adjustment mechanism is capable of moving at least one of the two brushes. The transmission means is a shaft screw,
The lens according to claim 5 or 6, wherein the adjusting mechanism is capable of moving at least one of the two brushes in a first direction orthogonal to an optical axis and an axial direction of the transmission means. apparatus. The apparatus further comprises two holding members for holding the two brushes, respectively.
The fixing member is provided with a flat portion extending in the first direction,
The lens apparatus according to claim 7, wherein the adjustment mechanism moves at least one of the two holding members on the flat portion. The holder member is radially fitted to the fixing member,
The lens apparatus according to any one of claims 1 to 8, wherein the transmission means is a single axial screw. The shaft screw is inserted into a hole formed in the base member,
The lens apparatus according to claim 9, wherein the hole is an elongated hole extending along an optical axis. A lens apparatus according to any one of claims 1 to 10;
And a camera body for holding an image pickup device for receiving subject light from the lens device.