JP5236969B2 - LENS DEVICE AND IMAGING DEVICE - Google Patents

Description

  The present invention relates to an inner focus type lens device that focuses by moving a part of lenses in the middle of a lens system back and forth in the optical axis direction, and an imaging device including the lens device.

  Conventionally, there has been a lens device that uses a cam mechanism to move the lens in the optical axis direction. The cam mechanism is provided with a spiral cam groove centered on the optical axis in a lens barrel that holds the lens, a frame inserted in the cam groove is attached to the lens, and the frame is moved by moving the frame along the cam groove. Is movable back and forth in the optical axis direction.

  In the cam mechanism, another barrel with a longitudinal groove with the optical axis direction as the longitudinal direction is provided on the outer peripheral side of the barrel with the cam groove, and the frame is inserted into the longitudinal groove and the cam groove. It is attached to the lens in a state where As a result, the position of the frame can be moved only in the optical axis direction, and the lens can be moved only in the optical axis direction without rotating.

  Such a lens apparatus includes a zoom lens apparatus that performs zoom adjustment and focus adjustment by moving the lens in the optical axis direction, for example. The zoom lens apparatus includes a zoom ring that rotates when performing zoom adjustment and a focus ring that rotates when performing focus adjustment.

  Some inner focus (internal focus, rear focus) zoom lens devices include a lens having both a zoom component and a focus component (hereinafter referred to as a “focus lens”). In such a zoom lens device, the cam mechanism that moves the focus lens includes a cam groove that can be moved during zoom adjustment (zoom operation) and can also be moved during focus adjustment (focus operation).

  In a zoom lens apparatus having such a cam mechanism, a rotation of a lens barrel (hereinafter referred to as a “focus cam cylinder”) that rotates the focus lens when the focus lens is moved in the same direction (for example, the objective side). In some cases, the direction was reversed between zoom operation and focus operation. For example, when the objective side is the front surface, the focus cam cylinder in this zoom lens device rotates clockwise around the optical axis when zooming, and rotates counterclockwise around the optical axis when focusing.

  The rotation direction of the zoom ring and the focus ring is customarily determined for each manufacturer for reasons such as ease of use of the lens device and manufacturer's philosophy. For this reason, conventionally, an idle gear is provided outside the effective diameter of the lens, and the rotation direction of the zoom ring and the focus ring is aligned by switching the rotation direction of the lens barrel holding the combined lens to the direction opposite to the rotation direction of the focus ring. There was a technique as described above (for example, see Patent Document 1 and Patent Document 2 below).

Japanese Patent Laid-Open No. 2004-233402 Japanese Patent Laid-Open No. 9-80294

  However, in the techniques of Patent Document 1 and Patent Document 2 described above, there is a problem in that it is difficult to reduce the size of the lens device because the diameter of the lens device becomes large in order to secure a space for providing an idle gear outside the effective diameter of the lens. there were.

  Whether the rotation direction of the zoom ring and the focus ring is aligned is determined by the model and manufacturer, etc.The successor model of the lens device that aligns the rotation direction of the zoom ring and the focus ring has a rotation direction of the zoom ring and the focus ring. It is aligned.

  The rotation directions of the zoom ring and the focus ring are often constant if, for example, the manufacturers are the same. That is, a manufacturer of a lens apparatus in which the rotation directions of the zoom ring and the focus ring are aligned has a tendency to manufacture a lens apparatus in which the rotation directions of the zoom ring and the focus ring are aligned in the succeeding model.

  If the rotation direction of the zoom ring and the rotation direction of the focus ring are reversed in the successor model, in order to avoid giving a sense of incongruity and difficulty to users familiar with the model with the same rotation direction, There was a background that the rotation direction of the focus ring was uniform for each model or manufacturer.

  An object of the present invention is to provide a lens device and an imaging device that are easy to use without increasing the size, in order to eliminate the above-described problems caused by the prior art.

In order to solve the above-described problems and achieve the object, a lens apparatus according to the present invention is a zoom lens apparatus including a plurality of lenses movable in the optical axis direction between a wide-angle end and a telephoto end, By rotating the zoom ring rotatable around the optical axis and the plurality of cam cylinders holding the plurality of lenses respectively in the same direction as the rotation direction of the zoom ring in accordance with the rotation of the zoom ring, A zoom adjustment mechanism that performs zoom adjustment by moving a plurality of cam cylinders in the optical axis direction, a focus ring that is a separate member from the zoom ring and is rotatable about the optical axis, be linear move in the optical axis direction with a focus cam barrel coupled to any of the cam barrel to rotation of the focus ring of the cam cylinder More, a focus adjustment mechanism which moves the focus lens to the optical axis direction to perform focus adjustment in which the focus cam barrel is held, when the zoom adjustment by the zoom adjustment mechanism, the rotational drive force for moving the focus lens A reverse rotation mechanism that rotates in a direction opposite to the rotation direction of the zoom ring, and the plurality of cam cylinders and the focus cam cylinder include cam grooves that are inclined in substantially the same direction with respect to the optical axis. The reverse rotation mechanism section includes a first interlocking ring having a reversing cam groove inclined in a direction opposite to the cam groove with respect to the optical axis, and a pin inserted into the reversing cam groove. And a second interlocking ring that is connected to the focus cam cylinder and is rotatable relative to the first interlocking ring about the optical axis. When the zoom ring rotates in the same direction as the rotation direction of the focus ring by sliding the pin along the reversing cam groove as the cam barrel moves in the optical axis direction, the focus cam The cylinder is linearly moved in the direction opposite to the direction of movement along with the rotation of the focus ring .

  According to the present invention, the amount of movement of the focus lens with respect to the amount of rotation of the focus ring can be moderated at any position between the wide-angle end and the telephoto end.

An image pickup apparatus according to the present invention includes the lens device described above .

  According to the lens device and the imaging device of the present invention, the rotation direction of the zoom ring and the focus ring for moving the plurality of lenses and the focus lens in the same direction can be made the same direction without increasing the size. There is an effect.

  Exemplary embodiments of a zoom lens apparatus and an imaging apparatus according to the present invention will be explained below in detail with reference to the accompanying drawings.

(Schematic configuration of the lens device)
First, a schematic configuration of a zoom lens device according to an embodiment of the present invention will be described. In this embodiment, focus adjustment is performed by moving a lens (focus lens) for focusing (focus adjustment, focus adjustment) in the optical axis direction between the wide-angle end (wide) and the telephoto end (tele). A zoom lens device will be described.

  1 and 2 are sectional views showing a schematic configuration of a lens device according to an embodiment of the present invention. FIG. 1 is a cross-sectional view through the optical axis of the zoom lens device at the wide-angle end, and FIG. 2 is a cross-sectional view through the optical axis of the zoom lens device at the telephoto end. 3 and 4 are plan views showing a part of the zoom lens device according to the embodiment of the present invention. FIG. 3 shows a state in which a part of the zoom lens device at the wide-angle end is expanded, and FIG. 4 shows a state in which a part of the zoom lens device at the telephoto end is expanded.

  1 to 4, the zoom lens device 100 includes a substantially cylindrical lens barrel 101 having an optical axis as an axis, and the optical axis direction of the lens barrel 101 (left and right direction in FIG. 1 to FIG. 4). It is attached to the main body of the imaging apparatus (not shown) via a mount 102 provided on one end side of the image pickup apparatus. An imaging element is disposed in the main body of the imaging apparatus. The image sensor photoelectrically converts external light received through the zoom lens device 100 and outputs an electrical signal corresponding to the amount of incident light. Specifically, the imaging element is realized by, for example, a CCD.

  The lens barrel 101 includes a zoom ring 103 and a focus ring 104. The zoom ring 103 and the focus ring 104 have an annular shape with the optical axis as the axis, and are provided so as to be rotatable relative to the lens barrel 101 around the optical axis. The zoom ring 103 and the focus ring 104 can rotate independently with respect to the lens barrel 101.

  A longitudinal groove cylinder 105 is provided on the inner peripheral side of the zoom ring 103. The vertical groove cylinder 105 has a substantially cylindrical shape with the optical axis as the axis, and is fixed in position with respect to the lens barrel 101. The vertical groove cylinder 105 includes a vertical groove 105a, a vertical groove 105b, and a vertical groove 105c whose longitudinal direction is the optical axis direction. The vertical grooves 105 a to 105 c penetrate the vertical groove cylinder 105 in the radial direction of the vertical groove cylinder 105.

  A rectilinear cylinder 106 is provided on the outer peripheral side of the vertical groove cylinder 105. The rectilinear cylinder 106 has a substantially cylindrical shape with the optical axis as an axis, and includes a cam groove 106a, a rectilinear groove 106b, and a key groove 106c. The cam groove 106 a and the rectilinear groove 106 b penetrate the rectilinear cylinder 106 in the radial direction of the rectilinear cylinder 106. The cam groove 106a has a longitudinal direction that is inclined with respect to the optical axis direction, and the inclined direction is from the lower left to the upper right in FIGS.

  The rectilinear cylinder 106 is connected to the vertical groove cylinder 105 via a pin 107 provided at an overlapping position between the vertical groove 105a and the key groove 106c. The pin 107 is provided in a state of being inserted into the vertical groove 105a and engaged with the key groove 106c. The position of the pin 107 slides within the overlapping position between the vertical groove 105a and the key groove 106c. As a result, the rectilinear cylinder 106 does not rotate around the optical axis and moves only in the optical axis direction. Specifically, it can be moved only from the left side to the right side or from the right side to the left side in FIGS. .

  A second cam cylinder 108 is provided on the outer peripheral side of the rectilinear cylinder 106. The second cam cylinder 108 has a substantially cylindrical shape with the optical axis as an axis, and is provided to be rotatable relative to the rectilinear cylinder 106 around the optical axis. The second cam cylinder 108 includes a cam groove 108a and a rectilinear groove 108b. The cam groove 108 a and the rectilinear groove 108 b penetrate the rectilinear cylinder 106 in the radial direction of the rectilinear cylinder 106. The cam groove 108a has a longitudinal direction that is inclined with respect to the optical axis direction, and the inclined direction is from the lower left to the upper right in FIGS.

  A first cam cylinder 109 is provided on the inner peripheral side of the longitudinal groove cylinder 105. The first cam cylinder 109 has a substantially cylindrical shape with the optical axis as the axis, and is provided to be rotatable relative to the longitudinal groove cylinder 105 around the optical axis. The rectilinear cylinder 106, the longitudinal groove cylinder 105, and the second cam cylinder 108 are connected via a pin 110.

  One end of the pin 110 is inserted at a position where the rectilinear groove 106b and the cam groove 108a intersect, and the other end is inserted in a groove 111 provided in the vicinity of the end on the objective side of the longitudinal groove tube 105. The groove 111 forms a circle centered on the optical axis on the outer peripheral surface of the vertical groove cylinder 105. For this reason, the pin 110 inserted into the groove 111 can move on the circumference around the optical axis by sliding in the groove 111.

  When the first cam cylinder 109 rotates with respect to the longitudinal groove cylinder 105, the pin 110 inserted into the groove 111 tries to rotate along with the first cam cylinder 109, but the pin 110 is inserted into the rectilinear groove 106b. For this reason, it does not move in the direction intersecting the optical axis, but moves only in the optical axis direction in the rectilinear groove 106b.

  The position of the pin 110 moves from the right side to the left side or from the left side to the right side in FIGS. 1 and 2 according to the rotation direction of the first cam cylinder 109 with respect to the longitudinal groove cylinder 105. Since the pin 110 is also inserted into the cam groove 108a, when the pin 110 moves in the optical axis direction, the crossing position of the rectilinear groove 106b and the cam groove 108a changes along the optical axis. The second cam cylinder 108 rotates around the optical axis.

  A second rectilinear cylinder 112 is provided on the outer peripheral side of the second cam cylinder 108. The second rectilinear cylinder 112 has a substantially cylindrical shape with the optical axis as an axis, and is provided to be rotatable relative to the second cam cylinder 108 around the optical axis. A key groove 112 a is provided on the inner peripheral surface of the second rectilinear cylinder 112. One end of a pin 113 inserted at a crossing position of the cam groove 106a provided in the rectilinear cylinder 106 and the rectilinear groove 108b provided in the second cam cylinder 108 is engaged with the key groove 112a.

  The crossing position of the cam groove 106a and the rectilinear groove 108b, that is, the position of the pin 113 moves from the right side to the left side or the left side to the right side in FIGS. 1 and 2 according to the rotation direction of the second cam cylinder 108 relative to the rectilinear cylinder 106. When the first cam cylinder 109 rotates in the clockwise direction, the pin 113 moves in the rectilinear groove from the right side to the left side in FIGS. 1 and 2, and the first cam cylinder 109 rotates in the counterclockwise direction. In this case, the straight groove moves from the left side to the right side in FIGS.

  The second rectilinear cylinder 112 rotates relative to the second cam cylinder 108 around the optical axis as the pin 113 moves in the optical axis direction, and in the optical axis direction with respect to the rectilinear groove 108b. Move relatively. That is, when the first cam cylinder 109 rotates with respect to the longitudinal groove cylinder 105, the rectilinear cylinder 106 and the second rectilinear cylinder 112 do not rotate with respect to the longitudinal groove cylinder 105, and the optical axis direction with respect to the longitudinal groove cylinder 105 Move relative to.

  A first lens group 114 is provided on the inner peripheral side of the second rectilinear cylinder 112. The first lens group 114 includes a plurality of lenses and a first group sliding frame 114a that holds these lenses. The first group sliding frame 114a has an annular shape with the optical axis as an axis, and supports the outer peripheral portions of the plurality of lenses in the first lens group 114. The first lens group 114 is fixed with respect to the second rectilinear cylinder 112 and moves in the optical axis direction together with the second rectilinear cylinder 112.

  The first cam cylinder 109 is connected to the zoom ring 103 by bayonet fitting on the mount 102 side in the optical axis direction. As a result, the first cam cylinder 109 rotates in the same direction as the rotation direction of the zoom ring 103 as the zoom ring 103 rotates. That is, the first cam barrel 109 rotates clockwise when the zoom ring 103 is rotated clockwise with the zoom lens device 100 viewed from the mount 102 side, and the zoom ring 103 rotates counterclockwise. Rotate counterclockwise when rotated in the direction.

  In addition, the first cam cylinder 109 includes a cam groove 109a, a cam groove 109b, and a cam groove 109c. The cam grooves 109 a to 109 c penetrate the first cam cylinder 109 in the radial direction of the first cam cylinder 109. The cam groove 109a has a shape inclined with respect to the optical axis direction as a longitudinal direction, and is bent so that the inclination direction and the inclination angle with respect to the optical axis direction change in the middle.

  The inclination direction in the cam groove 109a is different across the position where the inclination angle changes. One inclination direction is inclined from the lower left to the upper right direction in FIGS. 3 and 4, and the other inclination direction is in FIGS. 3 and 4. Inclined from upper left to lower right. The cam grooves 109b and 109c have a longitudinal direction that is inclined with respect to the optical axis direction, and the inclined direction is from the lower left to the upper right in FIGS.

  A second lens group 115 is provided on the inner peripheral side of the first cam cylinder 109. The second lens group 115 includes a plurality of lenses and a second group sliding frame 115a that holds these lenses. The second group sliding frame 115a has an annular shape with the optical axis as the axis, and supports the outer peripheral portions of the plurality of lenses in the second lens group 115. The second lens group 115 is fixed to the second group sliding frame 115a at one end of the pin 116 inserted at the intersection of the vertical groove 105b and the cam groove 109a, whereby the vertical groove cylinder 105 and the first cam cylinder 109 are fixed. It is connected to.

  When the first cam cylinder 109 rotates with respect to the vertical groove cylinder 105, the crossing position of the vertical groove 105b and the cam groove 109a, that is, the position of the pin 116 changes along the optical axis. The position of the pin 116 moves from the right side to the left side or from the left side to the right side in FIGS. 1 and 2 according to the rotation direction of the first cam cylinder 109 with respect to the longitudinal groove cylinder 105.

  The position of the pin 116 moves in the longitudinal groove from the left side to the right side in FIGS. 3 and 4 when the first cam cylinder 109 rotates in the clockwise direction. Further, the position of the pin 116 moves in the vertical groove from the right side to the left side in FIGS. 3 and 4 when the first cam cylinder 109 rotates counterclockwise.

  The pin 116 moves in the cam groove 109a from the upper side to the lower side in FIGS. 3 and 4 when the first cam cylinder 109 rotates in the clockwise direction, and the first cam cylinder 109 is counterclockwise. When rotating in the turning direction, the cam groove moves from the lower side to the upper side in FIGS. As the position of the pin 116 moves, the second lens group 115 moves in the first cam barrel 109 in the optical axis direction.

  A third lens group 117 is provided on the inner peripheral side of the first cam cylinder 109. The third lens group 117 includes a plurality of lenses and a third group sliding frame 117a that holds these lenses. The third group sliding frame 117a has an annular shape with the optical axis as an axis, and supports the outer peripheral portions of a plurality of lenses in the third lens group 117. The third lens group 117 has one end of a pin 118 inserted at the intersection of the vertical groove 105c and the cam groove 109b fixed to the third group sliding frame 117a, whereby the vertical groove cylinder 105 and the first cam cylinder 109 are fixed. It is connected to.

  When the first cam cylinder 109 rotates with respect to the vertical groove cylinder 105, the intersection position of the vertical groove 105c and the cam groove 109b, that is, the position of the pin 118 changes along the optical axis. The position of the pin 118 moves from the right side to the left side or from the left side to the right side in FIGS. 1 and 2 according to the rotation direction of the first cam cylinder 109 with respect to the longitudinal groove cylinder 105. When the first cam cylinder 109 rotates in the clockwise direction, the pin 118 moves in the vertical groove 105c from the left side to the right side in FIGS. 3 and 4 so that the first cam cylinder 109 moves in the counterclockwise direction. When rotating, the vertical groove 105c moves from the right side to the left side in FIGS.

  The pin 118 moves in the cam groove 109b from the upper side to the lower side in FIGS. 3 and 4 when the first cam cylinder 109 rotates in the clockwise direction, and the first cam cylinder 109 is counterclockwise. When rotating in the turning direction, the cam groove 109b moves from the lower side to the upper side in FIGS. By moving the position of the pin 118, the third lens group 117 moves in the first cam barrel 109 in the optical axis direction.

  A fourth group sliding frame 119 a that constitutes the fourth lens group 119 is provided on the inner peripheral side of the first cam cylinder 109. The fourth group sliding frame 119a has an annular shape with the optical axis as an axis, and is provided so as to be rotatable relative to the first cam cylinder 109 about the optical axis. The fourth group sliding frame 119a includes a vertical groove 119c.

  The longitudinal groove 119c has the optical axis direction as the longitudinal direction and penetrates the fourth group sliding frame 119a in the radial direction of the fourth group sliding frame 119a. The fourth group sliding frame 119a fixes the vertical groove cylinder 105 and the first cam cylinder by fixing one end of the pin 120 inserted at the intersection of the vertical groove 105a and the cam groove 109c to the fourth group sliding frame 119a. 109.

  When the first cam cylinder 109 rotates with respect to the vertical groove cylinder 105, the intersection position of the vertical groove 105a and the cam groove 109c, that is, the position of the pin 120 changes along the optical axis. The position of the pin 120 moves from the right side to the left side or from the left side to the right side in FIGS. 1 and 2 according to the rotation direction of the first cam cylinder 109 with respect to the longitudinal groove cylinder 105.

  When the first cam cylinder 109 rotates in the clockwise direction, the pin 120 moves in the vertical groove 105a from the left side to the right side in FIGS. 3 and 4 so that the first cam cylinder 109 moves in the counterclockwise direction. When rotating, the vertical groove 105a moves from the right side to the left side in FIGS.

  The pin 120 moves in the cam groove 109c from the upper side to the lower side in FIGS. 3 and 4 when the first cam cylinder 109 rotates in the clockwise direction, and the first cam cylinder 109 is counterclockwise. When rotating in the rotation direction, the cam groove 109c moves from the lower side to the upper side in FIGS. In this way, the fourth group sliding frame 119a moves in the first cam cylinder 109 in the optical axis direction while rotating around the optical axis together with the first cam cylinder 109.

  On the inner peripheral side of the fourth group sliding frame 119a, a plurality of lenses constituting the fourth lens group 119 and a fourth group lens frame 119b for holding these lenses are provided. The fourth group lens frame 119b supports the outer peripheral portions of the plurality of lenses in the fourth lens group 119, and is bayonet-fitted to the fourth group sliding frame 119a. As the position of the pin 120 moves, the fourth lens group 119 moves in the first cam cylinder 109 in the optical axis direction while rotating around the optical axis.

  A third cam cylinder 121 is provided on the outer peripheral side of the fourth group sliding frame 119a. The third cam cylinder 121 has an annular shape with the optical axis as an axis, and is provided to be rotatable relative to the fourth group sliding frame 119a around the optical axis. The third cam cylinder 121 is provided with a key groove 121a and a cam groove 121b.

  The key groove 121a has a longitudinal direction in the optical axis direction, and has a shape recessed in the radial direction of the third cam cylinder 121 from the outer peripheral surface of the third cam cylinder 121 toward the optical axis. A pin 122 attached to the first cam cylinder 109 is engaged with the key groove 121a, whereby the third cam cylinder 121 is rotated in the same direction as the first cam cylinder 109 as the first cam cylinder 109 rotates. Rotate. The cam groove 121b has a longitudinal direction that is inclined with respect to the optical axis direction, and the inclined direction is from the lower left to the upper right in FIGS.

  A focus cam cylinder 123 is provided on the inner peripheral side of the fourth group sliding frame 119a. The focus cam cylinder 123 has one end of a pin 124 inserted at the intersection of the cam groove 121b provided in the third cam cylinder 121 and the vertical groove 119c provided in the fourth group sliding frame 119a. To the third cam cylinder 121 and the fourth group sliding frame 119a.

  The intersection position of the cam groove 121b and the vertical groove 119c, that is, the position of the pin 124, changes along the optical axis when the third cam cylinder 121 rotates with respect to the fourth group sliding frame 119a. Accordingly, when the third cam cylinder 121 rotates with respect to the fourth group sliding frame 119a, the focus cam cylinder 123 moves in the optical axis direction within the fourth group sliding frame 119a as the third cam cylinder 121 rotates. .

  A fifth lens group (focus group) 127 is provided on the inner peripheral side of the focus cam cylinder 123. The fifth lens group 127 includes a plurality of lenses and a fifth group sliding frame 127a that holds these lenses. The fifth group sliding frame 127a has an annular shape with the optical axis as the axis, and supports the outer peripheral portions of a plurality of lenses in the fifth lens group 127.

  The fifth lens group 127 rotates with the rotation of the third cam cylinder 121 and moves in the optical axis direction together with the focus cam cylinder 123 that moves in the optical axis direction. When the fifth lens group 127 rotates as the third cam cylinder 121 rotates, the position of the fifth cam group 127 does not change.

  The focus cam cylinder 123 includes a focus cam 123a. The focus cam 123 a passes through the focus cam cylinder 123 in the radial direction of the focus cam cylinder 123. The focus cam 123a has a longitudinal direction that is inclined with respect to the optical axis direction, and the inclined direction is from the lower left to the upper right in FIGS.

  A second F interlocking ring 125 is provided between the fourth group sliding frame 119 a and the focus cam cylinder 123. The second F interlocking ring 125 is connected to the fourth group sliding frame 119a by bayonet fitting. Accordingly, the second F interlocking ring 125 moves in the first cam cylinder 109 in the optical axis direction as the fourth group sliding frame 119a moves in the optical axis direction, and at the same time as the fourth group sliding frame 119a rotates. Rotate around the optical axis.

  On the inner peripheral surface of the second F interlocking ring 125, a key groove 125a whose longitudinal direction is the optical axis direction is provided. A focus frame 126 is inserted into the keyway 125a. The focus piece 126 is connected to the fifth group sliding frame 127a in the fifth lens group 127 while being inserted into the focus cam 123a, and the other end is inserted into the key groove 125a. In this embodiment, a focus lens is realized by the fifth lens group 127.

  A first F interlocking ring 128 is provided on the outer peripheral side of the second F interlocking ring 125. The first F interlocking ring 128 has a ring shape, and is provided so as to be rotatable relative to the second F interlocking ring 125 around the optical axis. A reversing cam 129 is provided on the inner peripheral surface of the first F interlocking ring 128. The inversion cam 129 has a longitudinal direction that is inclined with respect to the optical axis direction, and the inclination direction is from the upper left to the lower right in FIGS. 3 and 4. The reversing cam 129 is inclined in a direction opposite to the inclination direction of the cam grooves 106a, 108a, 109b, 109c and the focus cam 123a.

  A first F interlocking pin 130 attached to the second F interlocking ring 125 is inserted into the reversing cam 129. The first F interlocking pin 130 can slide within the reversing cam 129. When the second F interlocking ring 125 rotates with the rotation of the fourth group sliding frame 119a, the first F interlocking pin 130 moves along the inversion cam 129 while sliding in the inversion cam 129. At this time, the first F interlocking ring 128 does not rotate.

  An annular member 131 is provided on the outer peripheral side of the first F interlocking ring 128. The annular member 131 has an annular shape in which a flange is provided on one end side, and is connected to the focus ring 104 by fitting the flange portion to the focus ring 104 with a bayonet. As a result, the annular member 131 rotates in the same direction as the focus ring 104 around the optical axis as the focus ring 104 rotates. Both the focus ring 104 and the annular member 131 rotate at a fixed position with respect to the fixed cylinder in the optical axis direction.

  The first F interlocking ring 128 and the annular member 131 are connected by bringing a protrusion provided on the outer peripheral surface of the first F interlocking ring 128 into contact with the inner peripheral surface of the annular member 131. Accordingly, the first F interlocking ring 128 rotates in the same direction as the annular member 131 around the optical axis as the annular member 131 rotates. That is, the first F interlocking ring 128 rotates in the same direction as the focus ring 104 about the optical axis as the focus ring 104 rotates.

  When the focus ring 104 rotates, the annular member 131 and the first F interlocking ring 128 rotate. When the first F interlocking ring 128 rotates, the first F interlocking pin 130 moves along the inversion cam 129 while sliding in the inversion cam 129. Since the first F interlocking pin 130 is attached to the second F interlocking ring 125, when the first F interlocking pin 130 moves along the reversing cam 129, the second F interlocking ring 125 rotates.

  When the second F interlocking ring 125 rotates, the key groove 125a also rotates, so that a rotational force about the optical axis is applied to the focus piece 126 inserted into the key groove 125a. Since the focus piece 126 is inserted into the focus cam 123a, it slides along the focus cam 123a when a rotational force is applied. Thus, the fifth group sliding frame 127a, that is, the fifth lens group 127 moves in the optical axis direction while rotating about the optical axis.

  A ring-type ultrasonic motor 132 is provided on the outer peripheral side of the annular member 131. The ring type ultrasonic motor 132 includes an annular stator and a rotor. The stator includes a piezoelectric element and a plurality of protrusions provided on the circumference of the piezoelectric element so as to protrude toward the rotor. The rotor includes a metal flange-like spring and deforms so as to sink into the wavefront of the stator. There is also an ultrasonic motor using a resin material instead of the flange-shaped spring.

  In the ring type ultrasonic motor 132, when an AC voltage is applied to the piezoelectric element, a plurality of bending traveling waves are excited in the piezoelectric element, and are deformed so as to wave in the circumferential direction and are displaced in the thickness direction. The deformation (displacement) of the piezoelectric element is enlarged by the protrusion and transmitted to the rotor. For example, when a traveling wave in the rightward direction is excited in the stator, an elliptical vibration wave in the leftward direction is generated at the tip of each protrusion.

  A rotor contacts the front-end | tip of the processus | protrusion located in the wave front of the piezoelectric element which deform | transforms so that it may wave in a stator. And a rotor receives the urging | biasing force which moves to the left in a contact position from a protrusion by contacting with the front-end | tip of a protrusion at a wave front. In the ring type ultrasonic motor 132, the rotor can be rotated clockwise or counterclockwise about the optical axis by changing the direction of the AC voltage applied to the piezoelectric element, that is, the stator.

  The ring type ultrasonic motor 132 transmits the rotation of the rotor to the AF interlocking ring 133. The AF interlocking ring 133 is in contact with the rotor in the optical axis direction, and rotates in the same direction as the rotation direction of the rotor as the rotor rotates. The rotation of the AF interlocking ring 133 is transmitted to the shaft 135 supported by the bearing 134 via the bearing 134. The shaft 135 is in contact with the outer peripheral surface of the annular member 131 with the radial direction of the circle centered on the optical axis as the axial direction. The rotational force transmitted from the AF interlocking ring 133 via the bearing 134 is transmitted to the annular member 131.

  In the zoom lens device 100, zoom adjustment is performed by rotating the zoom ring 103 and moving the fifth lens group 127 from the first lens group 114 in the optical axis direction as the zoom ring 103 rotates. When zoom adjustment is performed, when the zoom ring 103 is rotated clockwise with the objective side viewed from the imaging apparatus side along the optical axis, the lens groups 114, 115, 117, 119, and 127 are in the wide-angle positions (FIG. 1). 3) and a telephoto position (see FIGS. 2 and 4). In zoom adjustment, when the zoom ring 103 is rotated counterclockwise while viewing the objective side from the imaging device side along the optical axis, each lens group in the zoom lens device 100 is in the telephoto position (FIG. 2). And from FIG. 4) to a wide-angle position (see FIGS. 1 and 3).

  Here, when zoom adjustment is performed, a plurality of cam cylinders respectively holding a plurality of lens groups 114, 115, 117, 119, and 127 are rotated by the rotation of the zoom ring 103. , A zoom adjustment mechanism for moving a plurality of cam tubes in the optical axis direction is realized.

  During zoom adjustment, an urging force is exerted on the fifth lens group 127 together with the fourth lens group 119 to move in the optical axis direction. Since the fifth lens group 127 is connected to the first F interlocking ring 128 via the second F interlocking ring 125 and the first F interlocking pin 130, an urging force that tends to move in the optical axis direction with respect to the fifth lens group 127. Acts, the first F interlocking pin 130 moves while sliding in the reversing cam 129.

  Accordingly, when the fifth lens group 127 moves in the optical axis direction, the fifth lens group 127 moves along the optical axis direction along with the fourth cam group 119 while rotating along the reversing cam 129. The fifth lens group 127 moves in the optical axis direction together with the focus cam cylinder 123 while rotating around the optical axis without changing the relative position with respect to the focus cam cylinder 123 during zoom adjustment.

  In the zoom lens apparatus 100, the focus adjustment is performed by rotating the focus ring 104 and moving the fifth lens group 127 in the optical axis direction as the focus ring 104 rotates. When focus adjustment is performed, when the focus ring 104 is rotated clockwise with the objective side viewed from the imaging apparatus side along the optical axis, the fifth lens group 127 moves from the mount 102 side to the first lens along the optical axis. Move to the group 114 side. Further, when the focus is adjusted, when the focus ring 104 is rotated counterclockwise with the objective side viewed from the imaging apparatus side along the optical axis, the fifth lens group 127 is aligned with the first lens group along the optical axis. It moves from 114 to the mount 102 side.

  Here, during focus adjustment, the focus cam cylinder connected to an arbitrary one of the plurality of cam cylinders is rotated in the same direction as the focus ring 104 by the rotation of the focus ring 104. The focus adjustment mechanism that moves the fifth lens group 127 held by the focus cam barrel 123 in the optical axis direction by rotating the lens to the right is realized.

  At the time of focus adjustment, the rotational force of the focus ring 104 is applied to the fifth lens group 127. Since the fifth lens group 127 is connected to the first F interlocking ring 128 via the second F interlocking ring 125 and the first F interlocking pin 130, when the focus ring 104 rotates, the rotation direction thereof is the first F interlocking ring 128 and the second F interlocking ring. It is reversed in the reverse direction with the interlocking ring 125. Accordingly, when the focus ring 104 rotates, the second F interlocking ring 125 rotates in the opposite direction (reverse direction) to the focus ring 104.

  Here, the rotation driving force for moving the fifth lens group 127 during zoom adjustment is made the rotation direction of the zoom ring 103 by a series of members that rotate the second F interlocking ring 125 in the direction opposite to the focus ring 104 (reverse direction). A reverse rotation mechanism that rotates in the reverse direction is realized.

  When the second F interlocking ring 125 rotates, a biasing force that rotates the focus top 126 in the same direction as the rotation direction of the second F interlocking ring 125 acts on the focus top 126 engaged with the key groove 125a. Due to this urging force, the focus piece 126 moves along the focus cam 123a, and as a result, the fifth lens group 127 moves in the optical axis direction.

  In the zoom lens device 100 of this embodiment, the user of the zoom lens device 100 automatically adjusts the focus by rotating the focus ring 104 by hand, and automatically uses the ring type ultrasonic motor 132 (user It is also possible to perform focus adjustment (without manually rotating the focus ring 104).

That is, even when the focus ring 104 is not rotating, when the ring type ultrasonic motor 132 is driven and the focus cam cylinder 123 is rotated in the same direction as the rotation direction of the focus ring 104, the focus ring 104 is rotated. The focus adjustment can be performed by linearly moving in the direction opposite to the direction of movement along with the rotation of . Regardless of which method is used for focus adjustment, when the focus ring 104 rotates during focus adjustment, the second F-linked ring 125 rotates in the opposite direction to the focus ring 104.

As described above, according to this embodiment, the rotation direction of the focus ring 104 is the same as the rotation direction of the focus ring 104 with the rotation of the zoom ring 103 without providing a mechanism for reversing the rotation direction of the focus ring 104. When the zoom ring 103 rotates in the direction, the focus cam cylinder 123 can be linearly moved in the direction opposite to the direction in which the focus cam cylinder 123 moves with the rotation of the focus ring 104 . Accordingly, the rotation directions of the zoom ring 103 and the focus ring 104 for moving the plurality of lenses and the focus lens in the same direction can be made the same direction without increasing the size of the zoom lens device 100.

  Then, by making the rotation direction of the zoom ring 103 and the focus ring 104 for moving the plurality of lenses and the focus lens in the same direction, the sensitivity of the focus adjustment by rotating the focus ring 104 is excessively high. Therefore, a focus adjustment mechanism that can perform stable focus adjustment can be configured.

  Further, according to this embodiment, the cam for zoom adjustment and the cam for focus adjustment can be formed in a direction that can be smoothly connected, so at any position between the wide-angle end and the telephoto end. The amount of movement of the focus lens relative to the amount of rotation of the focus ring 104 can be moderated. Thus, the fifth lens group 127 can be smoothly moved over the entire area between the wide-angle end and the telephoto end, and good focus adjustment can be performed regardless of the variable magnification.

Further, according to the imaging apparatus including the lens device of this embodiment, the focus ring 104 can be moved along the rotation direction of the zoom ring 103 without providing a mechanism for reversing the rotation direction of the focus ring 104. When the zoom ring 103 rotates in the same direction as the rotation direction, the focus cam cylinder 123 can be linearly moved in a direction opposite to the direction in which the focus ring 104 moves as the focus ring 104 rotates . Without this, the rotation directions of the zoom ring 103 and the focus ring 104 for moving the plurality of lenses and the fifth lens group 127 in the lens device in the same direction can be made the same direction.

  As described above, according to the present embodiment, the zoom ring 103 and the focus ring 104 for moving the plurality of lenses and the fifth lens group 127 in the same direction without increasing the size of the lens device and the imaging device. The rotation directions of the two can be the same.

  As described above, the lens device and the imaging device according to the present invention are useful for the lens device and the imaging device including the lens device, and in particular, a part of the lens in the middle of the lens system is moved back and forth in the optical axis direction. This is suitable for an inner focus type lens device that focuses by adjusting the focus and an image pickup apparatus including the lens device.

It is sectional drawing (the 1) which shows schematic structure of the lens apparatus of embodiment concerning this invention. It is sectional drawing (the 2) which shows schematic structure of the lens apparatus of embodiment concerning this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view (part 1) illustrating a developed part of a zoom lens device according to an embodiment of the present invention. FIG. 3 is a plan view (part 2) in which a part of the zoom lens device according to the embodiment of the present invention is developed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Zoom lens apparatus 103 Zoom ring 104 Focus ring 123 Focus cam cylinder 123a Focus cam 127 5th lens group 128 1st F interlocking ring 129 Reversing cam 130 1st F interlocking pin

Claims (2)

A zoom lens device comprising a plurality of lenses movable in the optical axis direction between a wide-angle end and a telephoto end,
A zoom ring rotatable about the optical axis;
The plurality of cam cylinders that respectively hold the plurality of lenses are rotated in the same direction as the rotation direction of the zoom ring with the rotation of the zoom ring, thereby moving the plurality of cam cylinders in the optical axis direction. Zoom adjustment mechanism for zoom adjustment with
A focus ring that is a separate member from the zoom ring and is rotatable about the optical axis;
Focus which are connected to any of the cam cylinder of the plurality of the cam cylinder, focusing cam barrel comprising a cam groove inclined in the substantially same direction relative to the optical axis and the cam groove comprises a plurality of cam barrel holds A focus adjustment mechanism for adjusting the focus by moving the lens in the optical axis direction;
A reversing cam groove that is inclined in a direction opposite to the cam groove with respect to the optical axis, and rotates in the same direction as the focus ring about the optical axis as the focus ring rotates. A first interlocking ring that does not rotate with rotation, and a pin inserted into the reversing cam groove, the first interlocking ring being provided so as to be relatively rotatable around the optical axis; A second interlocking ring that moves in the direction of the optical axis as the zoom ring rotates,
When the zoom ring is rotated in the same direction as the rotation direction of the focus ring during zoom adjustment by the zoom adjustment mechanism, the pin inserted into the reversing cam groove slides along the reversing cam groove. Then, the second interlocking ring is rotated by the slide, and the focus lens connected to the first interlocking ring through the second interlocking ring and the pin is moved by the rotation to the focus lens. A reverse rotation mechanism that moves in the direction opposite to the direction of movement in the optical axis direction as the ring rotates ;
Lens apparatus characterized by comprising a.   An imaging apparatus comprising the lens device according to claim 1.

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