JP6063754B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel used in an imaging apparatus such as a still camera, a video camera, or a portable information terminal with a camera.

  2. Description of the Related Art Conventionally, as a collapsible lens barrel used in an imaging apparatus, a part of a lens group constituting a photographing optical system is retracted from the photographing optical path when retracted in order to shorten the length in the optical axis direction in the retracted state. Such a lens barrel is known (for example, see Patent Document 1).

  In the lens barrel disclosed in Patent Document 1, in the retracted state, the retractable lens frame that holds the retractable lens is rotated with respect to the rectilinear frame that is the holding member, and a part of the retractable lens frame is formed in the rectilinear frame. The retraction opening is retracted from the photographing optical path. Here, the rectilinear frame is disposed so as to be fitted to the inner surface of the rotatable cam frame and to advance and retreat as the cam frame rotates. In the retracted state, the retractable lens frame retracts so that a portion protruding from the retracting opening of the rectilinear frame is positioned in the cam frame.

JP 2012-18325 A

  By the way, in an imaging device, it is desired to use a bright lens having a small F value as a photographing optical system. However, when the lens is brightened, the lens diameter increases. Therefore, as disclosed in Patent Document 1, in the configuration in which the retracting opening of the retractable lens frame is formed only on the retaining member of the retractable lens frame, there is a limit to increasing the retractable lens. As a result, when the retractable lens is made larger, the diameter of the entire lens barrel must be increased, leading to an increase in the size of the lens barrel.

  Accordingly, an object of the present invention made in view of such a viewpoint is to provide a lens barrel capable of increasing the diameter of the retractable lens without causing an increase in the diameter of the lens barrel.

The invention of the lens barrel that achieves the above object is as follows.
Multiple lenses,
A plurality of annular members loosely fitted so as to be relatively displaceable and supporting the plurality of lenses so as to be relatively movable in the optical axis direction;
An imaging state in which the plurality of lenses are arranged on the optical axis, and a retractable lens that is a part of the plurality of lenses is retracted from the optical axis and is more in the optical axis direction than the imaging state. In the retracted state whose length is shortened, and in a lens barrel that can be expanded and contracted,
A retractable lens frame for holding the retractable lens;
A predetermined annular member of the plurality of annular members is provided, and the retractable lens frame can be rotated and displaced in a plane orthogonal to the optical axis between a photographing position in the photographing state and a retracted position in the retracted state. A retractable lens frame support to support;
One annular member of the plurality of annular members is composed of a rotating ring rotatably arranged on the outer peripheral side of the predetermined annular member, and the rotating ring penetrates in a radial direction and a part thereof is cut away. A retractable lens frame accommodating portion in which at least a part of the retractable lens frame is accommodated in the notch, wherein the notch is formed , rotates in a plane perpendicular to the optical axis in accordance with the transition to the retracted state , and ,
It is characterized in that comprising the.

  According to the present invention, in a telescopic lens barrel, the diameter of the retractable lens can be increased without increasing the diameter of the barrel.

It is a disassembled perspective view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. FIG. 4 is a development view of a third rotating ring illustrated in FIG. 1. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 1st Embodiment. It is a fragmentary perspective view of the 3 group lens ring part group shown in FIG. FIG. 4 is a partial perspective view of a third group lens ring assembly including a third rotating ring shown in FIG. 1. It is the top view which looked at the object side from the 3 group lens ring set about the lens barrel concerning a 1st embodiment. It is the perspective view which looked at the 4 group lens ring set shown in Drawing 1 from the image side. It is sectional drawing which shows the standard imaging state of the lens-barrel which concerns on 1st Embodiment. It is sectional drawing which shows the tele imaging | photography state of the lens barrel which concerns on 1st Embodiment. It is sectional drawing which shows the wide imaging | photography state of the lens-barrel which concerns on 1st Embodiment. It is sectional drawing which shows the retracted state of the lens-barrel which concerns on 1st Embodiment. It is a disassembled perspective view of the lens barrel which concerns on 2nd Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 2nd Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 2nd Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 2nd Embodiment. It is a fragmentary sectional view of the lens barrel which concerns on 2nd Embodiment. It is the top view which looked at the object side from the 3 group lens ring set about the lens barrel concerning a 2nd embodiment. It is sectional drawing which shows the retracted state of the lens-barrel which concerns on 2nd Embodiment.

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

(First embodiment)
1 to 20 show a lens barrel according to the first embodiment. The lens barrel 1 according to the present embodiment is of an interchangeable lens type that is detachably attached to a housing of an imaging device such as an electronic camera, and has a photographing optical system composed of a plurality of lenses having a four-group configuration. In the following description, the optical axis of the photographing optical system in the lens barrel 1 is represented by the symbol O. Further, in the direction along the optical axis O (optical axis direction), the subject side (object side) is the front, and the direction in which each annular member in the lens barrel 1 heads forward is the feeding direction. On the other hand, in the optical axis direction, the imaging side (image side) is the rear, and the direction when each annular member is moving backward is referred to as the retraction direction. In addition, the rotation direction of each constituent member in the lens barrel 1 is represented by the rotation direction viewed from the front side.

  The lens barrel 1 is not subjected to a shooting operation in a shooting state including a mode in which a shooting operation can be performed by extending in the optical axis direction, that is, a mode waiting for the shooting operation, and a shortening from the shooting state in the optical axis direction. The entire length is configured to be stretchable between the retracted state of the form. In addition, the lens barrel 1 in the photographing state is operated by changing or moving a plurality of annular members between the short focal position (wide photographing state) and the long focal position (tele photographing state). Zooming) is possible.

  As shown in an exploded perspective view in FIG. 1, the lens barrel 1 includes a first group lens ring set 11, a second group lens ring set 12, a third group lens ring set 13, a fourth group lens ring set 14, A rotary ring 15, a second rotary ring 16, a third rotary ring 17, a first linear movement ring 18, a second linear movement ring 19, a fixed ring 20, a zoom operation ring 21, first to third exterior rings 22 to 24, and The lens mount 25 is provided. The lens barrel 1 is detachably attached to the housing of the imaging device via the lens mount 25.

  First, the schematic configuration and fitting relationship of these annular members will be described.

  As shown in the partial cross-sectional view of FIG. 2, the first group lens ring unit set 11 holds a first group lens ring 11 a formed in a cylindrical shape, and a first group lens 31 having a positive refractive power inside the first group lens ring 11 a. A first group lens holding frame 11b and the like are provided. In the present embodiment, the first lens group 31 is composed of three lenses. The first group lens ring unit 11 is loosely fitted to the inner diameter of the second rotary ring 16, the second straight movement ring 19 is loosely fitted to the inner diameter of the first group lens ring 11a, and the third straight movement ring 19 is thirdly fitted to the inner diameter of the second straight movement ring 19. The rotating ring 17 is loosely fitted.

  The second group lens ring set 12 is a second group lens holding frame 12a that holds the second group lens 32 having negative refractive power, and protrudes outwardly spaced apart from the outer periphery of the second group lens holding frame 12a. A plurality of (for example, three) guide protrusions 12b are provided. In the present embodiment, the second group lens 32 is composed of four lenses. The second group lens ring set 12 is loosely fitted to the inner diameter of the third rotating ring 17.

  The third group lens ring portion group 13 includes a third group lens ring 13a formed in a cylindrical shape, a numerical aperture (brightness) adjusting diaphragm 35 supported by the third group lens ring 13a, and a three-group lens ring having positive refractive power. The third group lens frame 13b holding the group lens 33 and the third group lens frame 13b are displaced to the photographing position on the image side of the diaphragm 35 on the optical axis O in the photographing state, and to the retracted position separated from the optical axis O in the retracted state. A retractable lens frame support portion 36 (see FIG. 13) that is supported by the third group lens ring 13a is provided. In other words, in the present embodiment, the third group lens 33 constitutes a retractable lens and is composed of four lenses. The third group lens frame 13b constitutes a retractable lens frame. The third group lens ring set 13 is loosely fitted to the inner diameter of the third rotating ring 17. The detailed configuration of the third lens group ring assembly 13 will be described later.

  The second rotating ring 16 is loosely fitted to the inner diameter of the first linear moving ring 18. The first rectilinear moving ring 18 is loosely fitted to the inner diameter of the first rotating ring 15. The first rotating ring 15 is loosely fitted to the inner diameter of the fixed ring 20. The zoom operation ring 21 is loosely fitted to the outer diameter of the fixed ring 20 so as to be rotatable. The first outer ring 22 is fixed to the object side end of the fixed ring 20, and the second and third outer rings 23 and 24 are fixed to the outer periphery of the fixed ring 20. The lens mount 25 is fixed to the image side end of the fixed ring 20 with screws or the like.

  The fourth group lens ring set 14 includes a fourth group lens ring 14a fixed to the image side end of the first rectilinear moving ring 18 by screws or the like, and a fourth group lens holding a fourth group lens 34 having a positive refractive power. The frame 14b, the support unit 37 that supports the fourth group lens frame 14b on the fourth group lens ring 14a so as to be displaceable in the optical axis direction, the electromagnetic drive unit 38 that moves the fourth group lens frame 14b in the optical axis direction (see FIG. 16), etc. Is provided. In the present embodiment, the fourth group lens 34 is composed of two lenses. The detailed configuration of the fourth group lens ring assembly 14 will be described later.

  Next, the detailed structure and engagement relationship of each annular member described above will be described. 2 and FIGS. 4 to 12 referred to in the following description show different radial cross-sections in order to clearly show the engagement relationship between the annular members.

  As shown in a development view in FIG. 3, the third rotating ring 17 includes a plurality of (for example, three) two-group lens cam grooves 17 a penetrating and advancing the two-group lens ring group 12, and three A plurality of (for example, three) three-group lens cam grooves 17b through which the group lens ring assembly 13 is advanced and retracted are formed to be spaced apart from each other in the circumferential direction. That is, the second group lens cam groove 17a constitutes an object side lens cam groove, and the third group lens cam groove 17b constitutes a retracting lens cam groove.

  Further, the outer peripheral surface of the image side end portion of the third rotating ring 17 is spaced apart in the circumferential direction, and has a bottom for restricting and rotating the third rotating ring 17 with respect to the second rectilinear moving ring 19. A plurality of (for example, two) rotating grooves 17c are formed. Further, as shown in FIG. 1, on the inner peripheral surface of the second rectilinear moving ring 19 in which the third rotating ring 17 is loosely fitted to the inner diameter, it extends in the direction of the optical axis, and the two-group lens ring set 12 In addition, a plurality of bottomed rectilinear grooves 19a for restricting the rotation of the third group lens ring set 13 and moving it straight in the optical axis direction are formed.

  As shown in FIG. 1, the second lens group ring assembly 12 includes a plurality of (for example, three) pins 12 c that are press-fitted into the tip of the guide protrusion 12 b. As shown in FIG. 2, the pin 12 c passes through the corresponding second group lens cam groove 17 a of the third rotating ring 17 and engages with the corresponding rectilinear groove 19 a of the second rectilinear moving ring 19. The third group lens ring part group 13 has a plurality of (for example, three) pins 13c that are press-fitted to the outer peripheral surface of the third group lens ring 13a so as to be spaced apart in the circumferential direction. The pin 13 c passes through the corresponding third group lens cam groove 17 b of the third rotating ring 17 and engages with the corresponding rectilinear groove 19 a of the second rectilinear moving ring 19. As shown in the partial cross-sectional view of FIG. 4, the second rectilinear moving ring 19 includes a plurality of (for example, two) pins 19b that are press-fitted to the inner peripheral surface of the image side end portion in the circumferential direction. . The pin 19b is engaged with the corresponding rotation groove 17c of the third rotation ring 17.

  Therefore, the third rotary ring 17 rotates in a state where the forward / backward movement in the optical axis direction is restricted with respect to the second straight movement ring 19. When the third rotary ring 17 rotates, the second group lens ring set 12 and the third group lens ring set 13 rotate in the state where the rotation is restricted by the second rectilinear moving ring 19. It moves forward and backward in the optical axis direction according to the direction.

  As shown in FIG. 1, a plurality of bottomed (for example, 3) bottoms for advancing and retreating the first group lens ring set 11 are formed on the inner peripheral surface of the second rotary ring 16 in which the first group lens ring set 11 is loosely fitted to the inner diameter. Pieces of cam grooves 16a are formed apart from each other in the circumferential direction. On the outer peripheral surface of the second rectilinear moving ring 19 that is loosely fitted to the inner diameter of the first group lens ring 11a, a bottomed bottom is provided that extends in the optical axis direction to restrict the rotation of the first group lens ring part set 11 to advance and retreat. A plurality of (for example, three) rectilinear grooves 19c are formed spaced apart in the circumferential direction. Further, a plurality of (for example, three) pins 11c penetrating the first group lens ring 11a and projecting inward and outward are press-fitted to the image side end portion of the first group lens ring 11a so as to be spaced apart in the circumferential direction. As shown in the partial cross-sectional view of FIG. 5, the pin 11c protrudes outside the first group lens ring 11a into a corresponding cam groove 16a of the second rotary ring 16 and protrudes inside the first group lens ring 11a. The portion to be engaged with the corresponding rectilinear groove 19 c of the second rectilinear moving ring 19.

  Therefore, when the second rotating ring 16 rotates, the first group lens ring unit set 11 advances and retracts in the optical axis direction according to the rotation direction of the second rotating ring 16 in a state where the rotation is restricted by the second rectilinear moving ring 19. Moving.

  As shown in FIG. 1, the image side end of the second rectilinear moving ring 19 has a plurality of (for example, two) penetrating holes for restricting the forward and backward movement of the third rotating ring 17 relative to the second rectilinear moving ring 19. The rotation guide groove 19d is formed so as to be separated in the circumferential direction. A plurality of (for example, two) pins 17d are press-fitted on the outer peripheral surface of the image side end of the third rotating ring 17 so as to be spaced apart from each other in the circumferential direction. Further, as shown in a partial cross-sectional view in FIG. 6, a plurality of (for example, two) through holes 16 b for rotating the third rotating ring 17 are provided in the circumferential direction at the image side end of the second rotating ring 16. They are spaced apart. The pin 17 d of the third rotating ring 17 passes through the corresponding rotation guide groove 19 d of the second rectilinear moving ring 19 and is fitted in the corresponding through hole 16 b of the second rotating ring 16.

  Therefore, when the second rotating ring 16 rotates, the third rotating ring 17 rotates integrally with the second rotating ring 16.

  As shown in a partial cross-sectional view in FIG. 7, a bottomed rotation guide groove 15 a is formed on the inner peripheral surface of the image side end portion of the first rotation ring 15. A plurality of (for example, three) pins 18a are formed on the outer peripheral surface of the image side end of the first rectilinear moving ring 18 loosely fitted to the inner diameter of the first rotating ring 15 so as to be spaced apart in the circumferential direction. Yes. The pin 18 a is engaged with the rotation guide groove 15 a of the first rotation ring 15.

  Therefore, the first rotating ring 15 can only rotate with respect to the first rectilinear moving ring 18 without moving in the optical axis direction.

  As shown in FIG. 1, a plurality of (for example, three) rectilinear grooves 15 b extending in the optical axis direction are formed on the inner peripheral surface of the first rotating ring 15 so as to be separated in the circumferential direction. The first rectilinearly moving ring 18 is formed with a plurality of (for example, three) through-cam grooves 18b for moving the second rotating ring 16 forward and backward, spaced apart in the circumferential direction. A plurality of (for example, three) pins 16 c are formed on the outer peripheral surface of the image side end of the second rotating ring 16 so as to be spaced apart from each other in the circumferential direction. As shown in a partial cross-sectional view in FIG. 8, the pin 16 c penetrates the corresponding through cam groove 18 b of the first rectilinear moving ring 18 and engages with the corresponding rectilinear groove 15 b of the first rotating ring 15. .

  Therefore, when the first rotating ring 15 rotates, the second rotating ring 16 moves forward and backward in the optical axis direction according to the through cam groove 18 b of the first rectilinear moving ring 18 while rotating together with the first rotating ring 15.

  As shown in FIG. 1, the second rectilinear moving ring 19 has a flange portion 19e at the image side end portion. A plurality of (for example, three) protrusions 19f are formed on the outer peripheral surface of the flange portion 19e so as to be spaced apart from each other in the circumferential direction. Further, as shown in a partial sectional view in FIG. 9, a plurality of (for example, three) rectilinear grooves 18c along the optical axis direction are formed on the inner peripheral surface of the first rectilinear moving ring 18 so as to be separated in the circumferential direction. ing. A corresponding protrusion 19f formed on the flange portion 19e of the second rectilinear moving ring 19 is engaged with the rectilinear groove 18c.

  Therefore, the second rectilinear moving ring 19 is movable in the optical axis direction without rotating with respect to the first rectilinear moving ring 18.

  As shown in FIG. 1, the fixed ring 20 has a plurality of (for example, three) bottomed cam grooves 20a spaced apart in the circumferential direction on the inner peripheral surface. A plurality of (for example, three) pins 15 c are press-fitted on the outer peripheral surface of the image-side end portion of the first rotating ring 15 loosely fitted to the inner diameter of the fixed ring 20 in a circumferential direction. The pin 15c is engaged with the corresponding cam groove 20a of the fixed ring 20, as shown in a partial cross-sectional view in FIG.

  Therefore, the first rotating ring 15 can rotate with respect to the fixed ring 20 and can move back and forth in the optical axis direction.

  As shown in FIG. 1, the first rectilinear moving ring 18 has a flange portion 18d at the image side end portion. A plurality of (for example, three) protrusions 18e are formed on the outer peripheral surface of the flange portion 18d so as to be spaced apart from each other in the circumferential direction. Further, a plurality of (for example, three) rectilinear grooves 20b having a bottom are provided on the inner peripheral surface of the fixed ring 20 so as to extend in the optical axis direction and restrict the rotation of the first rectilinear moving ring 18 to advance and retract. They are formed spaced apart in the circumferential direction. As shown in the partial sectional view of FIG. 11, a corresponding protrusion 18e formed on the flange portion 18d of the first rectilinear moving ring 18 is engaged with the rectilinear groove 20b.

  Accordingly, the first rectilinear moving ring 18 can move back and forth in the optical axis direction with respect to the fixed ring 20.

  As shown in FIG. 1, the zoom operation ring 21 is provided with a key member 21 a that is screwed to the image side end surface and extends in the optical axis direction on the inner surface side. A key groove 15d is formed on the inner surface of the first rotating ring 15 so as to extend in the optical axis direction. As shown in the partial sectional view of FIG. 12, a key member 21a attached to the zoom operation ring 21 is engaged with the key groove 15d. Note that a rotation guide groove 20 c through which the key member 21 a passes through the rotation range of the zoom operation ring 21 is formed at the image side end of the fixed ring 20.

  Therefore, when the zoom operation ring 21 is rotated, the rotation is transmitted to the first rotation ring 15, and the first rotation ring 15 rotates integrally with the zoom operation ring 21.

  Next, a detailed configuration of the third lens group ring assembly 13 will be described with reference to FIGS.

  FIG. 13 is a partial perspective view of the third lens group ring assembly 13. FIG. 14 is a partial perspective view of the third group lens ring assembly 13 including the third rotating ring 17. FIG. 15 is a plan view of the object side as viewed from the third group lens ring assembly 13. As described above, the third group lens ring portion group 13 includes the diaphragm portion 35 and the retractable lens frame support portion 36 supported by the third group lens ring 13a. The diaphragm part 35 is rotatably supported between two substantially circular plate members 35a each having an opening in the central part and two plate members 35a to control the central opening (for example, six sheets). The diaphragm blades 35b, the diaphragm actuator 35c (see FIGS. 10 and 12) for rotating the diaphragm blades 35b, and the like are held. The aperture actuator 35c is based on an aperture control signal input from the imaging device through a contact (not shown) provided on the lens mount 25 in a state where the lens barrel 1 is mounted on the housing of the imaging device. The aperture blade 35b is rotated to control the numerical aperture of the photographing optical system. The image-side plate member 35a is provided with a stopper member 35d (see FIG. 14) for positioning the third group lens frame 13b at the photographing position.

  The retractable lens frame support portion 36 has a support shaft 36a that is attached at an eccentric position inside the third group lens ring 13a so as to extend in the optical axis direction toward the image side. An arm 36b is rotatably supported on the support shaft 36a and is slidable in the axial direction. The third group lens frame 13b is integrally formed at one end of the arm 36b. That is, the third group lens frame 13b is supported so as to be rotatable with respect to the support shaft 36a in a plane orthogonal to the optical axis O and capable of moving back and forth in the optical axis direction. At the image side end of the support shaft 36a, a flange portion 36c for positioning the position of the third group lens frame 13b on the optical axis with respect to the diaphragm portion 35 in the photographing state is formed.

  The arm 36b is urged by a spring 36d wound around the support shaft 36a, for example, in the clockwise direction, that is, the third group lens frame 13b is rotated and biased in the direction from the retracted position toward the photographing position, and at the image side in the optical axis direction. It is energized to move straight ahead. In the photographing state, the rotational biasing force applied to the arm 36b by the spring 36d is restricted by the third group lens frame 13b coming into contact with the stopper member 35d provided on the plate member 35a of the diaphragm 35. Further, in the photographing state, the urging force of the arm 36b moving forward by the spring 36d is restricted by the image side end surface of the arm 36b coming into contact with the flange portion 36c of the support shaft 36a. Thereby, in the photographing state, the third group lens frame 13b is positioned at the photographing position on the optical axis O and at a position on the predetermined optical axis with respect to the diaphragm 35. A cam portion 36e is formed at the other end of the arm 36b.

  On the other hand, as shown in FIGS. 14 and 15, the image-side end portion of the third rotating ring 17 protrudes inward and can be selectively contacted with the cam portion 36e at the other end portion of the arm 36b. 17e is formed. The contact portion 17e contacts the cam portion 36e of the arm 36b by the counterclockwise rotation of the third rotating ring 17 when the lens barrel 1 is retracted, and the arm 36b is counterclockwise around the support shaft 36a. Rotate in the direction. Thereby, the third group lens frame 13b is retracted from the optical axis O to the retracted position.

  Thus, in the present embodiment, the third group lens frame 13b is rotatably supported by the third group lens ring 13a via the arm 36b, and the third rotation that displaces the third group lens ring 13a in the optical axis direction. As the ring 17 rotates, the arm 36b is rotated to retract the third group lens frame 13b to the retracted position. Therefore, the retracting mechanism for the third group lens frame 13b can be easily configured.

  In the retracted state, the lens barrel 1 according to the present embodiment is an annular member that is sequentially positioned on the outer peripheral side from the third group lens ring 13a that supports the third group lens frame 13b, as shown in FIG. The retraction lens is connected to the three-rotation ring 17, the second rectilinear movement ring 19, the first group lens ring 11a, the second rotation ring 16, the first rectilinear movement ring 18, and the first rotation ring 15, and is located on the image side of the lens barrel 1. A frame housing portion 40 is formed. Then, at least a part of the third group lens frame 13b is accommodated in the retractable lens frame accommodating portion 40 at the retracted position.

  Here, the retractable lens frame housing portion 40 is formed by a notch formed in each annular member. Therefore, as shown in FIG. 1, a notch 17f is formed at the image side end of the third rotating ring 17, and a notch 19g is formed at the image side end of the second rectilinear moving ring 19. A notch 11d is formed at the image side end of 11a. Further, a notch 16 d is formed at the image side end of the second rotating ring 16, a notch 18 f is formed at the image side end of the first rectilinearly moving ring 18, and an image side end of the first rotating ring 15 is formed. A notch 15e is formed. For the third group lens ring 13a that supports the third group lens frame 13b, the third group lens ring 13a is disposed only on the object side so that the diaphragm 35 and the retractable lens frame support unit 36 are exposed from the third group lens ring 13a. By arranging, the entire circumference on the image side is cut out. The notches 17f, 19g, 11d, 16d, 18f, and 15e communicate with the radial direction of the lens barrel 1 to form the retractable lens frame housing portion 40 when the third group lens frame 13b is retracted to the retracted position.

  Next, the detailed configuration of the fourth group lens ring assembly 14 will be described with reference to FIG.

  FIG. 16 is a perspective view of the fourth group lens ring assembly 14 as viewed from the image side. As described above, the fourth group lens ring unit set 14 includes the fourth group lens ring 14a, the fourth group lens frame 14b, the support unit 37, and the electromagnetic drive unit 38. The fourth group lens ring 14a has a diameter larger than that of the fourth group lens frame 14b at the center, and an opening through which the third group lens frame 13b and the retractable lens frame support 36 of the third group lens ring set 13 can enter in the photographing state. A cylindrical portion 14c (see FIG. 2 for example) having a flange and a flange portion 14d formed on the outer periphery thereof. In the fourth group lens ring 14a, the flange portion 14d is fixed to the image side end portion of the first rectilinear moving ring 18 by screwing or the like. The flange portion 14d is formed with a concave portion 14e that protrudes toward the image side and into which the image side lens of the third lens group 33 can enter in the retracted state.

  The flange portion 14d has a minimum diameter smaller than the inner diameter of the third group lens ring 13a that supports the third group lens frame 13b, and a maximum diameter of the first rotation ring 15 on the outermost periphery side that forms the retractable lens frame housing portion 40. It is formed larger than the outer diameter. This prevents undesired stray light from the notches forming the retractable lens frame housing portion 40 from entering the imaging apparatus in the photographing state. That is, the flange portion 14d of the fourth group lens ring 14a also functions as a light blocking member that blocks unwanted light. Therefore, since it is not necessary to provide a dedicated light shielding member, the configuration can be simplified.

  The support portion 37 includes three leg portions 37a, 37b, and 37c that extend in the radial direction from the fourth group lens frame 14b. At the free end of the leg portion 37a, as shown in FIG. 7, for example, a sleeve 37d is provided extending in the optical axis direction. The sleeve 37d is loosely fitted to a guide shaft 37e extending in the optical axis direction and fixed to the fourth group lens ring 14a so as to be movable in the axial direction. A U-shaped groove 37f is formed at the free end of the leg portion 37b. The U-shaped groove 37f is engaged with an anti-rotation shaft 37g that extends and is fixed to the fourth group lens ring 14a in the optical axis direction so as to be movable in the axial direction. The guide shaft 37e and the rotation stop shaft 37g are respectively fixed to the image side of the flange portion 14d via a lid member 37h. Therefore, the fourth group lens frame 14b is displaceable in the optical axis direction along the guide shaft 37e and the rotation stop shaft 37g in a state where the rotation around the optical axis is prevented by the U-shaped groove 37f and the rotation stop shaft 37g. It is supported by the group lens ring 14a.

  The electromagnetic drive unit 38 includes a coil 38a and two magnetic circuit units 38b. The coil 38a is positioned so as to be wound around the inner periphery of the cylindrical portion 14c, and is fixedly bonded to the leg portions 37a to 37c. Therefore, the coil 38a is supported by the fourth group lens ring 14a so as to be displaceable in the optical axis direction integrally with the fourth group lens frame 14b. Further, as shown in FIG. 8, for example, the magnetic circuit portion 38b includes a yoke 38c having a U-shaped cross section fixed to the fourth lens group lens ring 14a so as to straddle the winding side of the coil 38a, and a coil And a permanent magnet 38d attached to the yoke 38c so as to cause a magnetic flux intersecting with the winding side of 38a to act.

  A focus adjustment signal is input to the coil 38a through a contact point (not shown) provided on the lens mount 25 from the imaging device in a state where the lens barrel 1 is mounted on the housing of the imaging device. Thereby, the fourth group lens frame 14b is displaced in the optical axis direction by the electromagnetic action of the current flowing through the coil 38a and the magnetic flux of the permanent magnet 38d acting on the coil 38a, and the focusing adjustment of the photographing optical system is performed.

  According to the lens barrel 1 according to the present embodiment, for example, when the zoom operation ring 21 is rotated clockwise as viewed from the front side of the lens barrel 1, the first rotation ring 15 is moved along with the rotation. While being rotated in the direction, the first linear moving ring 18 is fed out integrally. When the first rotating ring 15 rotates in the clockwise direction, the second rotating ring 16 and the third rotating ring 17 integrally rotate in the clockwise direction along with the rotation. Then, the second rotating ring 16 is drawn out while rotating, and the first group lens ring unit set 11 is rotated and regulated by the second linear moving ring 19 along with the rotation. When the second rotating ring 16 is extended, the third rotating ring 17 and the second rectilinear moving ring 19 are also extended integrally. Further, the clockwise rotation of the third rotating ring 17 causes the second group lens ring part group 12 and the third group lens ring part group 13 to be extended or retracted along with the rotation.

  As a result, the lens barrel 1 can be photographed in any one of the standard photographing state, the tele photographing state, and the wide photographing state. Here, the second group lens 32 and the third group lens 33 are arranged as shown in FIG. 17 in the standard photographing state, as shown in FIG. 18 in the tele photographing state, and as shown in FIG. 19 in the wide photographing state. Be placed.

  As apparent from FIGS. 17 to 19, the second group lens 32 is most advanced in the optical axis direction from the retracted state to the wide photographing state, and is retracted from the wide photographing state to the tele photographing state, so that the lens in the wide photographing state. It is farthest from the mount 25 and is closest to the lens mount 25 in the telephoto state. The third group lens 33 is closest to the lens mount 25 in the wide shooting state, and is farthest from the lens mount 25 in the tele shooting state. The movement amount of the third group lens 33 is smaller than the movement amount of the second group lens 32. Further, a part of the third group lens frame 13b and the retractable lens frame support part 36 enter the cylindrical part 14c of the fourth group lens ring 14a in each photographing state. The partial cross-sectional views shown in FIGS. 2 and 4 to 12 show different radial cross-sections in the wide photographing state.

  As described above, the lens barrel 1 according to the present embodiment is configured such that the first rotation ring 15 is extended, the second rotation ring 16 is extended, and the first group lens ring assembly is set by the clockwise rotation of the zoom operation ring 21. This is a so-called three-stage payout of 11 payouts.

  Further, when the zoom operation ring 21 is rotated counterclockwise from the photographing state, the so-called 3 of the retraction of the first rotation ring 15, the retraction of the second rotation ring 16, and the retraction of the first group lens ring assembly 11 is performed. The structure is stepped down.

  Here, when the lens barrel 1 is retracted, the third group lens frame 13b is moved by the rotation of the third rotating ring 17 with the retractable lens frame housing portion 40 formed, as shown in FIG. Rotates and starts to retract, and retracts integrally with the third lens group ring 13a. When the third group lens frame 13b is retracted to a predetermined retracted position, as shown in FIG. 20, the image side lens of the third group lens 33 enters the recess 14e formed in the flange portion 14d of the fourth group lens ring 14a, and The group lens frame 13b comes into contact with the flange portion 14d around the recess 14e, and the subsequent retraction of the third group lens frame 13b is restricted by the flange portion 14d. When the third rotation ring 17 is further rotated by the rotation of the zoom operation ring 21 and retracts to a predetermined position, the movement of the third group lens frame 13b in the optical axis direction is restricted and the third group lens ring is restricted. 13a and the throttle portion 35 are retracted to a predetermined position against the elastic force of the spring 36d.

  Thereby, in the retracted state shown in FIG. 20, the object side end faces of the first outer ring 22, the first rotating ring 15, the first rectilinear moving ring 18, the second rotating ring 16, and the first group lens ring 11a are substantially on the same plane. The dimension of the lens barrel 1 in the optical axis direction is the shortest.

  Further, a part of the third group lens frame 13b is accommodated in the retractable lens frame accommodating portion 40 and retracts to a predetermined retracted position. Here, as shown in FIG. 15, the retractable lens frame housing portion 40 is a third rotating ring 17 which is an annular member sequentially positioned on the outer peripheral side from the third group lens ring 13a that supports the third group lens frame 13b. The second rectilinear moving ring 19, the first group lens ring 11a, the second rotating ring 16, the first rectilinear moving ring 18 and the first rotating ring 15 are formed. Therefore, since a relatively large space can be secured as the retractable lens frame housing portion 40, a bright lens having a large diameter can be used as the third lens group 33 that is the retractable lens without causing an increase in the diameter of the lens barrel 1. it can.

  In the retracted state, the retractable lens frame housing portion 40 is formed on the outer peripheral side of the aperture portion 35. The third group lens frame 13b is retracted to a position where the shortest distance between the outer peripheral surface and the optical axis O is equal to or larger than the outer diameter of the diaphragm 35, and a part thereof is accommodated in the retractable lens frame accommodating portion 40. . Thus, in the retracted state, the distance from the object side lens surface (first surface) of the first group lens 31 to the image side lens surface (final surface) of the fourth group lens 34 can be reduced, so that the lens barrel 1 in the retracted state can be reduced. The dimension in the optical axis direction can be further shortened. Further, if the third group lens frame 13b is retracted to the outer peripheral side of the aperture portion 35, a sufficient retract space can be secured on the outer peripheral side of the aperture portion 35 in the optical axis direction and the direction orthogonal thereto. . Accordingly, a bright lens having a large thickness and a large diameter can be used as the third lens group 33 without causing an increase in the diameter of the lens barrel 1, and the lens design is free from aberrations and the like. The degree can be increased.

  The retractable lens frame housing portion 40 is formed by notches formed in a plurality of annular members sequentially positioned on the outer peripheral side from the third group lens ring 13a that supports the third group lens frame 13b. Therefore, the retractable lens frame housing part 40 can be easily formed.

  In particular, the lens barrel 1 according to the present embodiment has a zoom function, and includes a third group lens 33 that is a retractable lens and a second group lens 32 that is located on the object side, and a common third rotating ring 17. To advance and retract in the optical axis direction. As shown in FIGS. 17 to 19, the second group lens 32 is most advanced in the optical axis direction from the retracted state to the wide photographing state, and is retracted from the wide photographing state to the tele photographing state, so that the wide photographing state is reached. Thus, it is farthest from the lens mount 25 and is closest to the lens mount 25 in the telephoto state. The third group lens 33 is closest to the lens mount 25 in the wide shooting state, and is farthest from the lens mount 25 in the tele shooting state.

  Therefore, as shown in FIG. 3, the third-group lens cam groove 17b of the third rotating ring 17 is formed to be concave on the object side (convex on the image side) when in the wide shooting state. Yes. The second group lens cam groove 17a is convex on the object side when in the wide shooting state, and the convex hem portion is on the object side of the third group lens cam groove 17b when in the tele shooting state. It is formed so as to be located in the vicinity of the recess. As a result, a sufficient space can be secured for forming the notch 17 f for the retractable lens frame housing portion 40 at the image side end of the third rotating ring 17.

  In the retracted state shown in FIG. 20, for example, when the zoom operation ring 21 is rotated clockwise as viewed from the front side of the lens barrel 1, the third rotation ring 17 is rotated clockwise in synchronization with the rotation. Rotate to. As a result, the third group lens ring 13a is extended, and the arm 36b of the retractable lens frame support portion 36 that supports the third group lens frame 13b contacts the flange portion 36c of the support shaft 36a by the elastic force of the spring 36d. When the contact portion 17e of the third rotating ring 17 is disengaged from the cam portion 36e at the other end of the arm 36b at the beginning of the rotation of the third rotating ring 17, the third group lens frame 13b is elasticized by the spring 36d. Accordingly, the support shaft 36a is rotated clockwise. As a result, the third group lens frame 13b is positioned at a predetermined shooting position on the image side of the diaphragm 35, and the lens barrel 1 enters a shooting state.

  In this way, the retractable lens frame support portion 36 displaces the retractable lens frame 13b from the retracted position to the capturing position at the initial stage of transition from the retracted state to the capturing state. Therefore, since the lens barrel 1 can be quickly shifted from the retracted state to the photographing state, it is possible to quickly cope with the shutter chance.

(Second Embodiment)
21 to 27 show a lens barrel according to the second embodiment. The lens barrel 100 according to the present embodiment has a configuration in which the second rotating ring 16 is omitted and the two-stage retracted in the configuration of the lens barrel 1 according to the first embodiment. Hereinafter, as in the case of the first embodiment, the object side (object side) is defined as the front in the direction along the optical axis O of the photographing optical system in the lens barrel 100 (optical axis direction). The direction when each annular member heads forward is referred to as a feeding direction. Further, in the optical axis direction, the image forming side (image side) is set as the rear, and the direction when each annular member moves rearward is referred to as the retraction direction. In addition, the rotation direction of each constituent member in the lens barrel 100 is represented by the rotation direction viewed from the front side.

  As shown in an exploded perspective view in FIG. 21, the lens barrel 100 includes a first group lens ring set 111, a second group lens ring set 112, a third group lens ring set 113, a fourth group lens ring set 114, A rotation ring 115, a second rotation ring 117, a first straight movement ring 118, a second straight movement ring 119, a fixed ring 120, a zoom operation ring 121, first to third exterior rings 122 to 124, and a lens mount 125 are provided. . The lens barrel 100 is detachably attached to the housing of the imaging device via the lens mount 125.

  First, the schematic configuration and fitting relationship of these annular members will be described.

  As shown in the partial cross-sectional view of FIG. 22, the first group lens ring set 111 is similar to the first group lens ring set 11 of the first embodiment, and the first group lens holding frame that holds the first group lens ring 111 a and the first group lens 131. 111b and the like. The first group lens ring unit 111 is loosely fitted to the inner diameter of the first straight movement ring 118, the second straight movement ring 119 is loosely fitted to the inner diameter of the first group lens ring 111a, and the second straight movement ring 119 is further fitted to the inner diameter of the second straight movement ring 119. A two-rotation ring 117 is loosely fitted.

  The second group lens ring set 112 is a plurality of (for example, two group lens holding frames 112a that hold the second group lens 132, and a plurality of (for example, two) lens groups that are provided on the outer peripheral portion of the second group lens holding frame 112a. 3) guide protrusions 112b and the like, and is configured in the same manner as the two-group lens ring set 12 of the first embodiment. The second group lens ring part set 112 is loosely fitted to the inner diameter of the second rotating ring 117.

  The third group lens ring unit 113 includes a third group lens ring 113a, a diaphragm 135, a third group lens frame 113b that holds the third group lens 133 that is a retractable lens, and the third group lens frame 113b that is displaced between the photographing position and the retracted position. A retractable lens frame support portion 136 (see FIG. 21) and the like that can be supported are provided, and the configuration is the same as that of the third group lens ring portion set 13 of the first embodiment shown in FIGS. The third group lens ring set 113 is loosely fitted to the inner diameter of the second rotating ring 117.

  The first rectilinear moving ring 118 is loosely fitted to the inner diameter of the first rotating ring 115. The first rotating ring 115 is loosely fitted to the inner diameter of the fixed ring 120. The zoom operation ring 121 is loosely fitted to the outer diameter of the fixed ring 120 so as to be rotatable. The first outer ring 122 is fixed to the object side end of the stationary ring 120, and the second and third outer rings 123 and 124 are fixed to the outer periphery of the stationary ring 120. The lens mount 125 is fixed to the image side end of the fixed ring 120 with screws or the like.

  The fourth group lens ring unit set 114 is a support that supports the fourth group lens ring 114a, the fourth group lens frame 114b that holds the fourth group lens 134, and the fourth group lens frame 114b that is displaceable in the optical axis direction. 137, an electromagnetic drive unit 138 (see FIG. 24) that moves the fourth group lens frame 114b in the optical axis direction, and the like, and is configured in the same manner as the fourth group lens ring assembly 14 of the first embodiment. In the fourth group lens ring portion set 114, the fourth group lens ring 114a is fixed to the image side end portion of the first rectilinear moving ring 118 by screws or the like.

  Next, the detailed structure and engagement relationship of each annular member described above will be described. Note that the partial cross-sectional views of FIGS. 22 to 25 show different radial cross-sections in order to clearly show the engagement relationship between the annular members.

  Similarly to the third rotating ring 17 of the first embodiment, the second rotating ring 117 includes a plurality of (for example, three) two-group lens cam grooves penetrating therethrough for advancing and retracting the second group lens ring set 112. 117a and a plurality of (for example, three) three-group lens cam grooves 117b penetrating the advancing / retreating of the third-group lens ring set 113 are formed apart from each other in the circumferential direction. Further, on the inner peripheral surface of the second rectilinear moving ring 119 in which the second rotary ring 117 is loosely fitted to the inner diameter, the second group lens ring set 112 and the third group lens ring set are extended in the optical axis direction. A plurality of bottomed rectilinear grooves 119a for restricting the rotation of 113 and moving it straight in the optical axis direction are formed.

  In the second group lens ring assembly 112, a plurality of (for example, three) pins 112c press-fitted into the tip of the guide projection 112b correspond to the second group lens cam corresponding to the second rotary ring 117 as shown in FIG. The groove 117a passes through and engages with the corresponding rectilinear groove 119a of the second rectilinear moving ring 119. In the third group lens ring unit 113, a plurality of (for example, three) pins 113c press-fitted in the circumferential direction on the outer peripheral surface of the third group lens ring 113a are for the corresponding third group lens of the second rotary ring 117. The cam groove 117b passes through and engages with the corresponding rectilinear groove 119a of the second rectilinear moving ring 119.

  As shown in FIG. 21, at the image side end of the second rectilinear moving ring 119, a plurality of (for example, two) penetrating holes for restricting the advancing and retreating movement of the second rotating ring 117 relative to the second rectilinear moving ring 119 are provided. Rotation guide grooves 119d are formed spaced apart in the circumferential direction. A plurality of (for example, two) pins 117d are press-fitted on the outer peripheral surface of the image side end of the second rotating ring 117 so as to be spaced apart from each other in the circumferential direction. Further, as shown in FIG. 23, a plurality of bottomed (for example, two) cam grooves 111e for rotating and advancing and retreating the second rotary ring 117 are spaced apart in the circumferential direction on the inner peripheral surface of the first group lens ring 111a. Is formed. The pin 117d of the second rotation ring 117 passes through the corresponding rotation guide groove 119d of the second rectilinear movement ring 119 and is fitted in the corresponding cam groove 111e of the first group lens ring 111a.

  As shown in FIG. 21, a plurality of (for example, three) rectilinear grooves 115b extending in the optical axis direction are formed on the inner peripheral surface of the first rotating ring 115 so as to be spaced apart from each other in the circumferential direction. The first rectilinear moving ring 118 is formed with a plurality (for example, three) of penetrating cam grooves 118b for advancing and retracting the first group lens ring 111a so as to be spaced apart in the circumferential direction. A plurality of (for example, three) pins 111c are formed on the outer peripheral surface of the image side end portion of the first lens group ring 111a so as to be spaced apart from each other in the circumferential direction. As shown in FIG. 24, the pin 111c passes through the corresponding through cam groove 118b of the first rectilinear moving ring 118 and engages with the corresponding rectilinear groove 115b of the first rotating ring 115.

  As shown in FIG. 21, the second rectilinear moving ring 119 has a flange portion 119e at the image side end portion. A plurality of (for example, three) protrusions 119f are formed on the outer peripheral surface of the flange portion 119e so as to be spaced apart from each other in the circumferential direction. Further, as shown in FIG. 25, a plurality of (for example, three) rectilinear grooves 118c along the optical axis direction are formed on the inner peripheral surface of the first rectilinear moving ring 118 so as to be separated in the circumferential direction. A corresponding protrusion 119f formed on the flange portion 119e of the second rectilinear moving ring 119 is engaged with the rectilinear groove 118c.

  Since the other configuration is the same as that of the first embodiment, components similar to those of the first embodiment are denoted by reference numerals obtained by adding “100” to the reference numerals shown in the first embodiment. Detailed description will be omitted.

  According to the lens barrel 100 according to the present embodiment, for example, when the zoom operation ring 121 is rotated in the clockwise direction when viewed from the front side of the lens barrel 100, the first rotation ring 115 is rotated along with the rotation. The first straight moving ring 118 is fed out integrally with rotating in the direction. When the first rotating ring 15 rotates in the clockwise direction, the first lens group ring 111a is drawn out while rotating. In other words, the zoom operation ring 121 is rotated in the clockwise direction so that the first rotation ring 115 is extended and the first lens group ring unit 111 is extended so-called two-stage extension.

  Then, when the first group lens ring 111a rotates, the second rotating ring 117 and the second rectilinear moving ring 119 move forward and backward integrally while rotating clockwise according to the rotation. Further, as the second rotating ring 117 rotates in the clockwise direction, the second group lens ring part group 112 and the third group lens ring part group 113 are extended or retracted along with the rotation.

  As a result, the lens barrel 100 can shoot in one of the standard shooting state, the tele shooting state, or the wide shooting state, as shown in FIGS.

  22 to 25, when the zoom operation ring 121 is rotated counterclockwise from the photographing state in which the third lens group frame 113b is positioned on the optical axis O, the first rotation ring 15 The so-called two-stage retraction of the retraction and retraction of the first group lens ring set 111 is performed.

  Here, when the lens barrel 100 is retracted, as shown in FIG. 26, a first annular member is sequentially positioned on the outer peripheral side from the cutout portion of the third group lens ring 113a that supports the third group lens frame 113b. Notches 117f, 119g, 111d, 118f, and 115e formed in the two-rotation ring 117, the second rectilinear movement ring 119, the first group lens ring 111a, the first rectilinear movement ring 118, and the first rotation ring 115 communicate with each other. A lens frame housing part 140 is formed. The third group lens frame 113b is retracted from the optical axis O to the retracted position so that at least a part of the third group lens frame 113b is accommodated in the retractable lens frame accommodating portion 140, as in the case of the first embodiment. FIG. 26 is a plan view of the object side as viewed from the third group lens ring assembly 113.

  As a result, as shown in the sectional view of the retracted state in FIG. 27, the third group lens frame 13 b is retracted to the outer peripheral side of the diaphragm 35, and the first exterior ring 22, the first rotating ring 115, and the first rectilinear moving ring 118. In addition, the object-side end surfaces of the first group lens ring 111a are substantially flush with each other, and the dimension of the lens barrel 1 in the optical axis direction is the shortest.

  Therefore, according to the present embodiment, the same effect as in the case of the first embodiment can be obtained. Further, since the number of parts of the annular member constituting the lens barrel 100 can be reduced as compared with the first embodiment, the diameter can be shortened.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, the number of retracted / collapsed stages of the lens barrel is not limited to three or two, and may be four or more. In addition, the diaphragm unit is not limited to a rotary type that rotates the diaphragm blades, but may have a known configuration such as a method of sliding the diaphragm blades. Further, the aperture part may be omitted.

  In the above-described embodiment, the photographing optical system has a four-group configuration in which the first lens group includes three lenses, the second lens group includes four lenses, the third lens group includes four lenses, and the fourth lens group includes two lenses. The system was illustrated. However, in the case of a four-group imaging optical system, the first group lens has positive refractive power, the second group lens has negative refractive power, the third group lens has positive refractive power, and the fourth group lens has positive refractive power. For example, the number of lenses in each group can be variously changed. Further, the photographing optical system is not limited to a four-group configuration, and can be configured by a plurality of arbitrary plural groups. Further, the zoom mechanism may be omitted.

DESCRIPTION OF SYMBOLS 1 Lens barrel 11 1st group lens ring set 11a 1st group lens ring 11d Notch 12 2nd group lens ring set 13 3rd group lens ring set 13a 3rd group lens ring 13b 3rd group lens frame (retractable lens frame)
14 Four-group lens ring assembly 14d Flange (light shielding member)
15 1st rotation ring 15e Notch 16 2nd rotation ring 16d Notch 17 3rd rotation ring 17a Cam groove for 2 group lenses (object side lens cam groove)
17b Cam groove for third group lens (retracting lens cam groove)
17e Contact part 17f Notch 18 1st rectilinear movement ring 18f Notch 19 2nd rectilinear movement ring 19g Notch 20 Fixed ring 21 Zoom operation ring 22 1st exterior ring 23 2nd exterior ring 24 3rd exterior ring 25 Lens mount 31 First lens group 32 Second lens group 33 Third lens group (withdrawal lens)
34 Four-group lens 35 Diaphragm part 36 Retraction lens frame support part 36b Arm 36e Cam part 37 Support part 38 Electromagnetic drive part 40 Retraction lens frame accommodating part 100 Lens barrel 111 First group lens ring part set 111a First group lens ring 111d Notch 112 Two Group lens ring assembly 113 Third lens group ring assembly 113a Third lens group ring 113b Third lens group frame 114 Fourth lens group ring assembly 14d Flange (light shielding member)
115 First rotating ring 115e Notch 117 Second rotating ring 117a Cam groove for second lens group (object-side lens cam groove)
117b Cam groove for third lens group (retractable lens cam groove)
117e Abutting portion 117f Notch 118 First straight moving ring 118f Notch 119 Second straight moving ring 119g Notch 120 Fixed ring 121 Zoom operation ring 122 First exterior ring 123 Second exterior ring 124 Third exterior ring 125 Lens mount 131 First group lens 132 Second group lens 133 Third group lens 134 Fourth group lens 135 Aperture part 136 Retractable lens frame support part 136b Arm 136e Cam part 137 Support part 138 Electromagnetic drive part 140 Retractable lens frame housing part

Claims (9)

Multiple lenses,
A plurality of annular members loosely fitted so as to be relatively displaceable and supporting the plurality of lenses so as to be relatively movable in the optical axis direction;
An imaging state in which the plurality of lenses are arranged on the optical axis, and a retractable lens that is a part of the plurality of lenses is retracted from the optical axis and is more in the optical axis direction than the imaging state. In the retracted state whose length is shortened, and in a lens barrel that can be expanded and contracted,
A retractable lens frame for holding the retractable lens;
A predetermined annular member of the plurality of annular members is provided, and the retractable lens frame can be rotated and displaced in a plane orthogonal to the optical axis between a photographing position in the photographing state and a retracted position in the retracted state. A retractable lens frame support to support;
One annular member of the plurality of annular members is composed of a rotating ring rotatably arranged on the outer peripheral side of the predetermined annular member, and the rotating ring penetrates in a radial direction and a part thereof is cut away. A retractable lens frame accommodating portion in which at least a part of the retractable lens frame is accommodated in the notch, wherein the notch is formed , rotates in a plane perpendicular to the optical axis in accordance with the transition to the retracted state , and ,
A lens barrel characterized by comprising a.   2. The lens barrel according to claim 1, wherein the retractable lens frame support portion displaces the retractable lens frame from the retracted position to the image capturing position in an initial stage of transition from the retracted state to the image capturing state. In the shooting state, having a diaphragm portion located on the object side of the retractable lens,
The lens barrel according to claim 1, wherein the retractable lens frame support portion is formed on an outer peripheral side of the diaphragm portion in the retracted state.   The retractable lens frame housing portion is formed in each of the at least two annular members, and has a notch communicating in a radial direction when the retractable lens frame is retracted to the retracted position. The lens barrel according to one item.   A light shielding member having an outer diameter larger than the outer diameter of the outermost annular member of the at least two annular members and having an inner diameter smaller than the inner diameter of the predetermined annular member on the image side of the retractable lens The lens barrel according to any one of claims 1 to 4, further comprising:   The lens barrel according to claim 5, wherein the light shielding member supports a lens positioned on an image side of the retractable lens in the photographing state, and constitutes one annular member of the plurality of annular members. Wherein the plurality of lenses have a zoom function,
The rotating ring includes a retractable lens cam groove that moves the retractable lens in the optical axis direction in the photographing state, and an object-side lens cam groove that moves a lens located on the object side of the retractable lens in the optical axis direction. Have
The retractable lens cam groove has a shape that becomes a concave portion on the object side when the plurality of lenses are in a wide photographing state,
The object-side lens cam groove has a shape that becomes a convex portion on the object side when the plurality of lenses are in a wide photographing state, and the hem portion of the convex portion is in the tele-photographing state. Sometimes located near the recess of the retractable lens cam groove,
The lens according to any one of claims 1 to 6, wherein the retractable lens frame housing portion that communicates with the predetermined annular member in the retracted state is formed in a part of an image side end portion of the rotating ring. A lens barrel. The retractable lens frame support portion includes an arm that supports the retractable lens frame at one end portion thereof and rotatably supports the retractable lens frame within a plane orthogonal to the optical axis.
One annular member of the plurality of annular members is composed of a rotating ring that is rotatably arranged on an outer peripheral side of the predetermined annular member,
The rotating ring has a contact portion that selectively contacts the cam portion of the other end portion of the arm by rotation to rotate the arm,
The lens barrel according to any one of claims 1 to 7, wherein the arm is rotated by rotation of the rotating ring to retract the retractable lens to the retracted position. The plurality of lenses are, in order from the object side, a first group lens having a positive refractive power, a second group lens having a negative refractive power, a third group lens having a positive refractive power, and a fourth group having a positive refractive power. Consisting of lenses,
The lens barrel according to claim 1, wherein the third group lens is retracted to the retracted position in the retracted state as the retractable lens.

Images