JP5053754B2 - Lens barrel and optical equipment - Google Patents

Description

  The present invention relates to a lens barrel and an optical apparatus that is a camera equipped with the lens barrel.

  In an interchangeable lens system of a single-lens reflex camera in recent years, autofocusing has progressed, and devices having a lens driving actuator and a control electric circuit inside a lens barrel have become common.

  Further, it is common to arrange an electrical contact in the vicinity of a mount, which is a mounting portion of a camera and a lens for supplying power for driving a control signal from the camera and an actuator in the lens.

  In addition, the above-described control electric circuit generally uses a hard printed circuit board formed in an annular shape so as to avoid an optical system from the viewpoint of space efficiency inside the lens barrel, cost, and the like. And it is fixed in the vicinity of the mount as an electric component mounting board on which an electric circuit is mounted, and is electrically connected to the electric contact.

  As a fixing method, a method of screwing the printed circuit board positioned with respect to the fixing portion is generally used.

  Recently, a system for preventing camera shake applied to the camera has been studied, and there is a printed circuit board on which a sensor for detecting camera vibration is mounted.

  As a conventional example of the fixing method, Patent Document 1 discloses a configuration in which a printed circuit board on which a shake detection unit is mounted is screwed to a shake prevention mechanism unit via a cushioning material. .

  This is to prevent minute vibrations of the shake prevention mechanism from being transmitted to the shake detection means.

  Further, Patent Document 2 discloses a configuration in which the shake detection unit is covered with a case filled with a vibration absorber, and the case is screwed to the printed circuit board and the fixed portion via an elastic member.

This is to prevent not only mechanical vibration but also air vibration from being transmitted to the vibration detecting means.
Japanese Patent Application Laid-Open No. 07-159834 JP-A-11-231205

  However, the configurations of Patent Document 1 and Patent Document 2 require further improvement due to recent demands for downsizing and cost reduction of lens barrels. For example, there are cases where even the holes necessary for screwing cannot be installed, or where the printed circuit board cannot be held only by the elastic force due to deformation of the elastic member.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a lens barrel that is space-efficient and can hold a printed circuit board more reliably with a simple configuration.

In this invention, the 1st cylindrical member in which several protrusion was formed, the elastic member which has a hole part which has three flange parts and engages with the said protrusion, and adjoins among these three flange parts A printed circuit board engaged and held between the first flange portion and the second flange portion, and a first member that is fixed to the first tubular member and presses the elastic member in a direction along the protrusion. And the length of the hole in the direction along the protrusion is longer than the length of the protrusion, and the elastic member is formed of the three flange portions in the direction along the protrusion. A deformation absorbing portion provided between an adjacent second flange portion and a third flange portion pressed against the second cylindrical member and formed to be constricted with respect to a peripheral portion ; The end is closer to the third flange than the printed circuit board. It is located in front of the deformation absorbing portion .

  In the lens barrel and the optical apparatus of the present invention, space efficiency is achieved, and the printed circuit board can be more reliably held with a simple configuration.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing an internal structure of an interchangeable lens (optical apparatus) for a single-lens reflex camera having a printed circuit board according to an embodiment of the present invention.

  FIG. 2 is an exploded perspective view of the interchangeable lens of FIG.

  This interchangeable lens is a four-configuration lens having first to fourth lens groups L1 to L4 in order from the object side. All the lenses L1 to L4 move in the optical axis direction by a zoom operation, and the first lens by a focus operation. The first group lens L1 moves in the optical axis direction. Further, during the zoom operation, the second group lens L2 and the fourth group lens L4 move together. In addition to the movement in the optical axis direction, the second a-group lens L2a, which is a group on the object side of the second group lens L2, moves in the optical axis orthogonal direction in order to perform an image blur correction operation.

  Reference numeral 100 denotes a camera body having an image sensor 100a.

  Reference numeral 101 denotes a mount as a second cylindrical member. The mount 101 has a bayonet portion 101a for attachment to the camera body 100, and is fixed to a fixed cylinder 102 as a first cylindrical member with screws.

  An SW panel 103 is attached to the outer periphery of the fixed cylinder 102 as the first cylindrical member. By operating SW knobs 104 and 105 provided on the SW panel 103, it is possible to select whether or not to use functions such as autofocus and image blur correction.

  A zoom operation ring 106 is fitted on the outer periphery of the cylindrical portion 102 a of the fixed cylinder 102. A roller 107 attached to the outer periphery of the cylindrical portion 102a with a screw (not shown) is fitted in a circumferential groove 106a provided in the zoom operation ring 106. As a result, the zoom operation ring 106 cannot advance or retract in the optical axis direction, and only a fixed position rotation is allowed.

  A female helicoid ring 108 is provided with a convex cam 108 a that engages with a cam follower 106 b provided on the inner periphery of the zoom operation ring 106 on the outer periphery. Further, a protrusion 108b is provided that engages with a rotation restricting groove 102b provided on the inner periphery of the cylindrical portion 102a of the fixed cylinder 102. The convex cam 108a, the cam follower 106b, the protrusion 108b, and the rotation restricting groove 102b are provided at three locations equally at 120 °.

  Reference numeral 109 denotes a male helicoid ring, which has a male helicoid 109a that is screwed into a female helicoid 108c provided on the inner periphery of the female helicoid ring 108.

  A first lens holding frame 110 holds the first lens unit L1 and is screwed to the male helicoid ring 109.

  A name plate 111 is printed with specifications such as a focal length and a filter diameter, and plays a role of hiding screws and the like.

  Reference numeral 112 denotes a fourth lens holding frame that holds the fourth lens unit L4 and includes an arm portion 112b that extends radially from the outer periphery of the cylindrical portion 112a. The arm portion 112 b is engaged with a rectilinear groove 102 c provided in the fixed cylinder 102. A roller 113 is fixed to the tip of the arm portion 112b with a screw or the like.

  The roller 113 is engaged with a concave cam 106c provided on the inner periphery of the zoom operation ring 106. If the roller 113 is a known eccentric roller, the roller 113 is rotated through the hole 106d, thereby rotating the fourth lens holding frame 112. It is possible to adjust the amount of tilt with respect to the optical axis.

  Reference numeral 114 denotes a third lens holding frame which holds the third lens unit L3 and is provided with a cam follower 114a on the outer periphery. The cam follower 114 a is engaged with a convex cam 112 c provided on the inner periphery of the cylindrical portion 112 a of the fourth lens holding frame 112.

  Reference numeral 115 denotes a third group key, which is fixed to the inner periphery of the zoom operation ring 106 with screws. The third group key 115 has a guide portion 115 a extending in the optical axis direction. The guide portion 115 a is engaged with a guide receiving member 116 fixed to the third lens holding frame 114.

  Reference numeral 117 denotes a compression spring that urges the third lens holding frame 114 in the optical axis direction with respect to the fourth lens holding frame 112.

  Reference numeral 118 denotes a second lens group holding unit that holds the second lens group L2. An electromagnetic diaphragm 119 is fixed to the image plane side with a screw or the like. The second lens holding unit 118 itself is a cylinder of the fourth lens holding frame 112. It is fixed to the tip of the portion 112a.

  A focus unit 120 transmits the rotation of the DC motor 121 serving as a drive source to the male helicoid ring 109 via a gear train.

  Reference numeral 122 denotes a printed circuit board that is electrically connected to the second lens group unit 118, the electromagnetic diaphragm 119, the focus unit 120, and the like via a flexible printed circuit board (not shown) to perform various controls.

  Further, the printed circuit board 122 is provided with a plurality of notches 122a on the outer periphery as shown in FIG. The elastic member 123 is inserted into the cutout portion 122a while being elastically deformed.

  As shown in FIG. 4, the elastic member 123 is provided with a plurality of flange portions 123 a, and the flange portions 123 a are configured to sandwich the printed circuit board 122.

  The elastic member 123 is provided with a hole 123b at the center thereof, and the printed board 122 is positioned in the rotational direction by being inserted into the protrusion 102d provided in the fixed cylinder 102.

  Further, as shown in FIGS. 4 to 5, the mount 101 as the second cylindrical member is attached to the fixed cylinder 102 as the first cylindrical member, so that the mount 101 compresses and holds the elastic member 123 ( ), And the printed circuit board 122 is positioned in the optical axis direction.

  A contact terminal block 124 is fixed to the mount 101 and is connected to the printed circuit board 122 via a flexible printed circuit board, and is provided for communication with the camera body and power supply. .

  Reference numeral 125 denotes a zoom rubber ring, which is attached to the outer periphery of the zoom operation ring 106 to improve the operation feeling and also has an effect of closing the circumferential groove 106a and the hole 106d.

  126 is an adjustment washer that selectively uses washers having different thicknesses by back focus adjustment. The adjustment washer 126 is sandwiched between the mount 101 and the fixed cylinder 102 and is clamped by screwing the mount 101 to the fixed cylinder 102.

  Back focus adjustment is an operation that corrects the infinite focus position deviation caused by manufacturing errors of the lens and lens barrel parts, that is, the deviation from a predetermined surface of the lens barrel when focusing on an object at infinity. is there.

  At this time, by selectively using the thickness of the adjustment washer 126, the distance between the printed board 122 and the mount 101 in the optical axis direction is different. That is, the deformation amount of the elastic member 123 also changes.

  The length of the elastic member 123 in the direction of the optical axis is set so as to come into contact with the mount so that the adjustment washer 126 has a maximum thickness that can be assumed, so that an effect as a retaining is exhibited. ing.

  On the other hand, when the adjustment washer 126 is assumed to be the thinnest thickness, that is, when the adjustment washer 126 is not present, the elastic force due to the deformation of the elastic member 123 is maximized. At this time, the elastic member 123 is provided with a deformation absorbing portion 123c so that the elastic force due to the deformation of the elastic member 123 does not become an excessive force with respect to the mount 101, the fixed cylinder 102, and the printed circuit board 122.

  Next, the zoom operation in the above configuration will be described.

  When the zoom operation ring 106 is rotated, the female helicoid ring 108 advances and retreats in the optical axis direction without rotation by the interaction of the cam follower 106b, the convex cam 108a, the rotation restricting groove 102b, and the protrusion 108b. Thereby, the male helicoid ring 109 and the first lens holding frame 109 advance and retract in the optical axis direction. Similarly, due to the interaction of the roller 113, the concave cam 106c, the arm 112b, and the rectilinear groove 102c, the fourth lens holding frame 112 and the second lens holding unit 118 fixed thereto advance and retreat in the optical axis direction without rotation. . Then, the third lens holding frame 114 is rotated by the third group key 115 fixed to the zoom operation ring 106, and moves forward and backward in the optical axis direction by the interaction between the convex cam 112c and the cam follower 114a.

  As for the focusing operation, as described above, the rotation of the DC motor 121 is transmitted to the male helicoid ring 109 via the gear train, whereby the first lens holding frame is advanced and retracted in the optical axis direction while rotating by the helicoid. .

  Next, the configuration of the second lens holding unit 118 will be described with reference to FIGS. 6 and 7.

  FIG. 6 is an exploded perspective view of the second lens holding unit 118.

  FIG. 7 is a cross-sectional view of the second lens holding unit 118 with the electromagnetic diaphragm 119 attached.

  Reference numeral 225 denotes a second-a lens holding frame that holds the second-a lens unit L2a. A light-shielding plate 226 for preventing light leakage is attached to the object side.

  Reference numeral 127 denotes a permanent magnet, which is provided in each of the pitch direction and the yaw direction, and is fixed to the second-a lens holding frame 125 via a yoke 128 by caulking or the like.

  Reference numeral 129 denotes a second b lens holding frame which holds the second b lens group L2b and has a flange portion 129a for fixing to the fourth lens holding frame 112.

  A coil unit 130 is fixed to the second b lens holding frame 129 so as to face the permanent magnet 127 so as to maintain a predetermined clearance with the permanent magnet 127.

  The coil unit 130 includes a coil 131, a bobbin 132, and a terminal pin 133. The terminal pin 133 is fixed to the bobbin 132 so as to protrude to the electromagnetic restrictor 119 side on the side opposite to the permanent magnet 127. Yes.

  When the coil unit 130 is attached to the second b lens holding frame 129, the terminal pin 133 is fixed in a state of being exposed to the electromagnetic diaphragm 119 side through the through hole 129b.

  A rolling ball 134 is disposed so as to be sandwiched between the 2a lens holding frame 225 and the 2b lens holding frame 129, and restricts the permanent magnet 127 and the coil 131 to have a predetermined clearance.

  Further, when the coil 131 is energized, when the second-a lens holding frame 225 is moved in a direction orthogonal to the optical axis by a known magnetic circuit, rolling friction is generated, and the frictional resistance is greatly reduced.

  Reference numeral 135 denotes a tension spring, which is attached so that the hook portion at one end is hooked on the convex portion 225a of the second-a lens holding frame 225 and the hook on the other end is hooked on the convex portion 129c of the second-b lens holding frame 129.

  The tension springs 135 are arranged at three locations at equal 120 ° degrees, and the second-a lens holding frame 225 is held substantially at the center of the optical axis by the interaction.

  Further, the positions of the convex portion 225a and the convex portion 129c in the optical axis direction are made different so that the second-a lens holding frame 225 is urged against the second-b lens holding frame 129. This prevents the rolling ball 134 from falling off.

  Reference numeral 136 denotes a sheet member which is disposed in the hole 129d of the second b lens holding frame 129.

  For example, a vibration damping member such as gel is disposed in the hole 129d, and the protrusion 225b of the second-a lens holding frame 225 is inserted into the vibration damping member.

  Thereby, the oscillation of the 2a lens holding frame 225 by the tension spring 135 is suppressed.

  Reference numeral 137 denotes a light-shielding ring that is fixed to the second b lens holding frame 129 and hides the yoke 128 and the tension spring 135 to improve the interior appearance from the object side.

  Next, the electrical connection and assembly of the terminal pin 133 of the second lens holding unit 118 and the terminal 138 of the electromagnetic diaphragm 119 will be described with reference to FIGS. 8a and 8b.

  As described above, as shown in FIG. 8a, the terminal pin 133 is configured to protrude through the through hole 129b. Then, by arranging the second lens holding unit 118 and the electromagnetic diaphragm 119 side by side, the flexible printed circuit board 139 is soldered to the terminal 138 and the terminal pin 133, so that electrical connection can be easily performed. In addition, since the above structure is used, an inexpensive single-sided flexible printed circuit board is sufficient, and thus there is a cost reduction effect. Further, by connecting the flexible printed circuit board 139 to the printed circuit board 122, the movement of the electromagnetic diaphragm 119 and the second-a lens holding frame 225 in the direction perpendicular to the optical axis can be controlled.

  Further, as shown in FIG. 8b from the state of FIG. 8a, the electromagnetic diaphragm 119 is rotated, the flexible printed circuit board 139 is folded, and the electromagnetic diaphragm 119 is overlapped with the second b lens holding frame 129 so as to be screwed. To fix. As a result, it is possible to reduce the size of the moving magnet type image blur correction device and to provide a lens barrel that is easy to work and inexpensive even when the electromagnetic diaphragm is disposed adjacently. It becomes.

  In the embodiment described above, by attaching the mount 101 as the second cylindrical member to the fixed cylinder 102 as the first cylindrical member, the elastic member attached to the fixed cylinder 102 is pressed and deformed, The printed circuit board is held by the deformation.

  As a result, it is possible to provide a lens barrel having a printed circuit board that is not only capable of stably holding the printed circuit board but also can be further reduced in size and has good assembling workability. It becomes.

  In the above-described embodiment, the second cylindrical member is a lens mount, and the elastic member is provided with a deformation absorbing portion.

  As a result, the relative distance between the fixed cylinder and the lens mount, that is, the relative distance between the lens mount and the printed board changes due to the back focus adjustment.

  At this time, the elastic force of the elastic member against the printed board changes, but by providing the deformation absorbing portion, excessive elastic force is not applied, so that the printed board that can prevent the possibility of breakage or the like is provided. It is possible to provide a lens barrel having the same.

It is sectional drawing of the interchangeable lens barrel for single-lens reflex cameras which is the 1st Embodiment of this invention. It is a disassembled perspective view of the said interchangeable lens barrel. It is a partial exploded perspective view of the periphery of the printed circuit board in the interchangeable lens barrel. It is a fragmentary sectional view of the decomposition | disassembly state around the printed circuit board in the said interchangeable lens barrel. It is a fragmentary sectional view of the assembly state around the printed circuit board in the interchangeable lens barrel. It is a principal part disassembled perspective view of the image blur correction device in the interchangeable lens barrel. It is principal part sectional drawing of the image blur correction apparatus in the said interchangeable lens barrel. It is a principal part perspective view of the image blur correction apparatus in the said interchangeable lens barrel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Camera body 101 Mount 102 Fixed cylinder 102d Protrusion 122 Printed circuit board 123 Elastic member 123a Flange part

Claims (5)

A first tubular member formed with a plurality of protrusions;
An elastic member having three flange portions and a hole portion engaged with the protrusion;
A printed circuit board engaged and held between the first flange portion and the second flange portion adjacent to each other among the three flange portions;
A second cylindrical member fixed to the first cylindrical member and pressing the elastic member in a direction along the protrusion;
The length of the hole in the direction along the protrusion is longer than the length of the protrusion,
The elastic member is provided between a second flange portion adjacent to the three flange portions and a third flange portion pressed by the second cylindrical member in the direction along the protrusion, and a peripheral portion. A deformation absorbing portion formed so as to be constricted with respect to the protrusion, and an end portion of the protrusion is located on the third flange portion side of the printed circuit board and in front of the deformation absorbing portion. Characteristic lens barrel. The first flange portion before SL includes a surface in contact with the one surface of the printed circuit board, the second flange portion includes a surface in contact with the other surface of the printed circuit board,
The surface in contact with the first cylindrical member, the surface in contact with one surface of the printed circuit board, and the surface in contact with the other surface of the printed circuit board are orthogonal to the direction along the protrusion. ,
The lens barrel according to claim 1, wherein the printed circuit board has a notch that engages with the elastic member.   3. The lens barrel according to claim 1, wherein the printed circuit board is held at a portion where the protrusion and the hole are engaged in a direction along the protrusion. 4.   The lens barrel according to claim 1, wherein the hole is a through-hole that penetrates the elastic member. The lens barrel according to any one of claims 1 to 4,
An optical apparatus comprising: a camera body on which the lens barrel is mounted.

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