JP2014102416A - Lens device, lens device manufacturing method, and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device that enables a position adjustment between a main body member holding a lens and an exterior member to be performed without requiring a special tool.SOLUTION: A lens device is configured to enable a main body member 1005 holding a lens and an exterior member 1002 to adjust a relative position around an optical axis via an attachment member 1029 for mounting the exterior member in an optical direction to the main body member. The lens device has: the main body member 1005; a scale member 1027 that rotates in a direction around the optical axis in conjunction with a movement of a focus adjustment lens; and the exterior member 1002 that is mounted into the main body member, and provided with a window part 1026 making a distance scale viewable and an index 1027a indicative of a focus distance. The exterior member and the main body member have an adjustment structure 1028 that enables a position adjustment in the direction around the optical axis of the exterior member to the main body member for adjusting a position of the index to the distance scale in a state where the exterior member is semi-mounted to the main body member by the attachment member 1029.

Description

  The present invention relates to a lens device having a lens that moves in an optical axis direction, a manufacturing method thereof, and an imaging device.

  The mechanism for moving the focus adjustment lens in the optical axis direction in the lens device includes a guide cylinder having a straight groove extending in the optical axis direction and a cam engaged with a cam follower provided in a lens holding member for holding the focus adjustment lens Some have a groove and a cam cylinder that rotates around the optical axis. A scale member having a distance scale for displaying an in-focus distance, which is a distance to the in-focus subject, is attached to the cam cylinder or a member that rotates together with the cam cylinder.

  On the other hand, the lens device requires an adjustment mechanism for performing optical adjustment after assembly in the manufacturing process. However, considering the ease of manufacturing the lens device, the number of adjustment mechanisms is small and the configuration is simple. It is desirable that

  In Patent Document 1, the lens device is assembled (without disassembly), and the optical axis direction is determined by the focusing distance displayed by the scale member and the cam cylinder rotating around the optical axis with respect to the fixed cylinder. An adjustment mechanism is disclosed for matching the in-focus distance obtained by the focus adjustment lens that is moved to the in-focus distance obtained from the output of the encoder that detects the rotational position of the cam cylinder. An encoder base is attached to the fixed cylinder so that the rotational position in the direction around the optical axis can be adjusted.

  In this adjustment mechanism, the hole formed in the cam cylinder and the through groove formed in the encoder base are aligned with each other in the direction around the optical axis. The first adjustment pin is inserted into the hole and the through groove through the first opening. By operating the first adjustment pin around the optical axis, the cam cylinder and the encoder base rotate integrally around the optical axis, and the focus adjustment lens moves in the optical axis direction. Then, the encoder base is fixed to the fixed cylinder with a screw in a state where the focus adjustment lens is moved to a position where the focus adjustment lens is focused at infinity. Further, the second adjustment pin is inserted into the hole of the scale member through the second opening formed in the focus ring, and the scale member is rotated with respect to the cam cylinder by operating the second adjustment pin around the optical axis. The infinite distance on the scale member is matched with the distance display index provided on the outer cylinder.

JP 2009-42668 A

  However, in the adjustment mechanism of the lens device disclosed in Patent Document 1, even when attention is paid to the position adjustment of the scale member in the direction around the optical axis with respect to the cam cylinder, a special tool (second tool) is used for the position adjustment. An adjustment pin) is required, and an opening (second opening) for inserting the tool into a focus ring as an exterior member must be formed.

  The present invention provides a lens device that can adjust the position of an exterior member and a body member in a temporarily assembled lens device without requiring a special tool.

  A lens apparatus according to an aspect of the present invention includes a main body member that holds a lens, an exterior material that is attached to the main body member, and an attachment member that is attached to the main body member in the optical axis direction. The body member and the exterior member are characterized in that the relative position of the exterior member around the optical axis with respect to the body member can be adjusted via the mounting member.

  A lens apparatus according to another aspect of the present invention is a lens apparatus that performs focus adjustment by moving a focus adjustment lens in the optical axis direction. The lens device is provided with a main body member constituting at least a part of the main body of the lens device and a distance scale for displaying a focusing distance, and rotates around the optical axis in conjunction with the movement of the focus adjustment lens. An exterior member provided with a window portion that is attached to the main body member and enables visual recognition of the distance scale, and an index that indicates the in-focus distance on the distance scale. A member and a mounting member for mounting the exterior member on the main body member, and the exterior member and the main body member are in a semi-mounted state with respect to the main body member of the exterior member by the mounting member, and the position of the index relative to the distance scale It is characterized by having an adjustment structure that enables position adjustment in the direction around the optical axis with respect to the main body member of the exterior member for adjusting the angle.

  It should be noted that the imaging device and other optical devices also constitute another aspect of the present invention that the lens device is detachable or integrally provided.

  Furthermore, a method for manufacturing a lens device according to another aspect of the present invention includes a step of attaching an exterior member to a body member holding a lens, a step of attaching the exterior member to the body member via the attachment member, and a body member And a step of adjusting the relative position by rotating the relative position between the outer member and the exterior member around the optical axis.

  According to the present invention, there is no need for a special tool, and therefore there is no need to form an opening for inserting the tool in the exterior member, and in the temporarily assembled (semi-mounted state) lens device, Can be easily aligned (position adjustment) in the direction around the optical axis.

1 is a cross-sectional view of an interchangeable lens that is Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a rotation transmission ring and a scale member in the interchangeable lens of Example 1. FIG. 6 is a diagram illustrating a state in which the index of the exterior ring is displaced with respect to the scale member in the interchangeable lens of Example 1. FIG. 6 is a diagram illustrating a state in which the index of the exterior ring is aligned with the scale member in the interchangeable lens of Example 1. FIG. 3 is an enlarged view showing an adjustment mechanism in the interchangeable lens of Example 1. The disassembled perspective view of the said adjustment mechanism.

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

  A configuration of an interchangeable lens as a lens apparatus that is Embodiment 1 of the present invention will be described with reference to FIGS. In the following description, the object side and the image side of the interchangeable lens are also referred to as a front side and a rear side, respectively, and a portion between the front side and the rear side is also referred to as an intermediate portion. Further, the optical axis of the photographing optical system in the interchangeable lens is simply referred to as an optical axis, and the direction in which the optical axis extends (the direction extending in the object side and the image side) is referred to as the optical axis direction. Furthermore, a direction orthogonal to the optical axis (optical axis direction) is also referred to as a radial direction, and a circumferential direction around the optical axis is also referred to as a direction around the optical axis.

  The mount 1001 shown in FIGS. 1 and 6 is detachably attached to a camera body (an imaging device as an optical apparatus) (not shown). The camera body is provided with an image sensor composed of a CMOS sensor, a CCD sensor, or the like that photoelectrically converts a subject image formed by a photographing optical system described later.

  As shown in FIG. 1, the outer peripheral portion of the mount 1001 is fitted with an inner peripheral portion of a rear end of an outer tube (exterior member) 1002 constituting the outer appearance of the interchangeable lens in the radial direction. The rear surface 1003 of the rear end portion 1002a of the outer tube 1002 is in contact with the front end surface of the mount 1001 in the optical axis direction, so that the outer tube 1002 and the mount 1001 are relatively positioned in the optical axis direction. The

  In addition, an outer peripheral portion of a main body cylinder 1005 as a main body member constituting at least a part of the interchangeable lens main body (lens apparatus main body) is fitted in the intermediate inner peripheral portion of the outer cylinder 1002 in the radial direction. The exterior cylinder 1002 is attached to the main body cylinder 1005 so as to cover the outer periphery of the main body cylinder 1005. The interchangeable lens main body is configured by a main body cylinder 1005 and a member (for example, a guide cylinder 1007) described later that is attached to the main body cylinder 1005.

  The rear surface 1004 of the rear end portion 1005a of the main body cylinder 1005 is in contact with the front surface (the surface opposite to the rear surface 1003) of the rear end portion 1002a of the outer casing cylinder 1002, and thus the main body cylinder 1005 and the outer casing cylinder 1002 ( Furthermore, the mount 1001) is relatively positioned in the optical axis direction. The outer cylinder 1002 and the mount 1001 are coupled (jointly fastened) to the main body cylinder 1005 from the rear side with a screw 1029 as a mounting member. By attaching the mount 1001 to the mount of the camera body (not shown), the imaging position on the image sensor is determined, and the thickness in the optical axis direction of the mount 1001, the exterior cylinder 1002, and the body cylinder 1005 determines the imaging position. .

  Inside the main body cylinder 1005, the cam cylinder 1006 is disposed on the outer peripheral surface of the guide cylinder 1007 and is bayonet-coupled with the guide cylinder 1007, so that the cam cylinder 1006 rotates in the direction around the optical axis at a fixed position in the optical axis direction. Is rotatably supported. The guide tube 1007 is formed with a rectilinear groove portion 1007a extending in the optical axis direction. Further, the cam cylinder 1006 is formed with three sets of cam groove portions 1006a, each set including a plurality of cam groove portions. In these three sets of cam groove portions, a second lens holding frame (lens holding member) 1008 for holding the second lens group II, a third lens holding frame 1009 for holding the third lens group III, and a fourth lens group IV, respectively. Are engaged with cam followers (not shown) provided at a plurality of locations in the circumferential direction on the outer periphery of the fourth lens holding frame 1010. For this reason, when the cam cylinder 1006 rotates, each lens holding frame together with each cam follower is guided in the optical axis direction by the rectilinear groove portion 1007a (while rotation in the direction around the optical axis is prevented), and the cam lift in each cam groove portion. Is moved in the direction of the optical axis. Since the second lens group II, the third lens group III, and the fourth lens group IV are focus adjustment lenses, focus adjustment (autofocus and manual focus) is performed by moving these in the optical axis direction. The fourth lens holding frame 1010 is optically adjusted within the third lens holding frame 1009.

  The first lens group I is held by a first lens holding frame 1011. The first lens group I, the second lens group II, the third lens group III, and the fourth lens group IV constitute an imaging optical system. The positioning surface 1012 provided at the rear portion of the first lens holding frame 1011 contacts the front end surface of the guide tube 1007, so that the first lens holding frame 1011 and the guide tube 1007 are relatively positioned in the optical axis direction. The Further, the outer peripheral surface of the rear end portion 1013 of the first lens holding frame 1011 and the inner peripheral surface of the front end portion of the guide tube 1007 are fitted in the radial direction.

  An actuator 1014 is disposed between the inner peripheral surface of the main body cylinder 1005 and the outer peripheral surface of the cam cylinder 1006. The actuator 1014 is attached to the guide tube 1007 while leaving a space for disposing the cam tube 1006 between the actuator 1014 and the guide tube 1007. The guide key 1015 is fitted into a circumferential groove portion 1017 formed so that a convex portion formed so as to extend in the circumferential direction on the inner circumferential side thereof extends in the circumferential direction on the outer peripheral surface of the front end portion of the cam cylinder 1006. The cam cylinder 1006 is attached by a screw 1030. A focus key 1018 that is a rotation output portion of the actuator 1014 is engaged with the guide key 1015 in the direction around the optical axis. For this reason, the rotation output from the actuator 1014 is transmitted to the cam cylinder 1006 via the focus key 1018 and the guide key 1015, and rotates around the optical axis.

  The rotation of the actuator 1014 is controlled by the camera body that has performed the focus detection operation, whereby autofocus is performed.

  Before the guide key 1015 is attached to the cam cylinder 1006 with the screw 1030, the cam cylinder 1006 in which the circumferential groove portion 1017 is engaged with the convex portion of the guide key 1015 is rotated in the direction around the optical axis to adjust the focus. Optical adjustment is performed by changing the range in which each cam follower moves within each cam groove.

  The filter frame 1019 is positioned in the optical axis direction by the rear surface of the middle portion thereof coming into contact with the front end surface of the actuator 1014, and the filter frame 1019 is rotated around the optical axis by a filter frame mounting screw (not shown). It is mounted to prevent rotation in the direction.

  A focus ring attached between the rear end portion of the filter frame 1019 and the front end portion of the outer tube 1002 on the outer peripheral surface of the focus connecting ring 1020 so as to be integrally rotatable with the focus connecting ring 1020 in the direction around the optical axis. 1016 is arranged. When the user rotates the focus ring 1016 for manual focus, this rotation is transmitted to the cam barrel 1006 via the focus key 1018 and the guide key 1015, and rotates around the optical axis.

  The decorative plate 1021 is attached to the front surface of the filter frame 1019. In addition, a seal member 1022 that prevents entry of dust and dirt is disposed between the filter frame 1019 and the first lens holding member 1011 in a compressed state.

  A scale member 1023 shown in FIGS. 1, 2 and 6 is an annular member provided with a distance scale for displaying a focus distance, which is a distance to a subject in focus of the photographing optical system, by printing or the like. . As shown in FIGS. 1 and 2, the scale member 1023 is attached to the outer peripheral surface of a rotation transmission ring (coloring) 1024 that rotates in the direction around the optical axis when the rotational force from the actuator 1014 is transmitted. For this reason, the scale member 1023 rotates in the direction around the optical axis in conjunction with the movement of the second to fourth lens holding frames 1008 to 1010 in the optical axis direction (that is, focus adjustment) by the rotation of the cam cylinder 1006.

  As shown in FIG. 1 and FIG. 2, at one place in the circumferential direction of the rotation transmission ring 1024, a sticking positioning convex portion 1025 indicating the sticking position of the scale member 1023 is provided, and the scale member 1023 is connected to this convex portion. By aligning and affixing to 1025, the displacement of the scale member 1023 with respect to the rotation transmission ring 1024 is prevented.

  The exterior cylinder 1002 is provided with a distance display window portion 1026 that is an opening for allowing the user to visually recognize the distance scale of the scale member 1023 from the outside of the exterior cylinder 1002. In addition, an index member 1027 including an index indicating a distance scale corresponding to the in-focus distance among the distance scales of the scale member 1023 that rotates in accordance with the focus adjustment is provided around the distance display window portion 1026 on the outer peripheral surface of the exterior cylinder 1002. Is attached.

  In the interchangeable lens configured in this way, at the end of assembly, the outer ring 1002, the main body tube 1005, and the mount 1001 are fastened together with the screw 1029, so that these are completely fixed (coupled). However, it is necessary to adjust the position of the outer ring 1002 in the direction around the optical axis with respect to the main body cylinder 1005 in a semi-fixed state (semi-bonded state or temporarily assembled state) before the fastening with the screw 1029 is completed.

  For example, when assembly is performed in a state where the second to fourth lens holding frames 1008 to 101 are arranged at positions where they are focused at infinity, the scale member 1023 has L as shown in FIG. This is because a deviation S in the direction around the optical axis may occur between the infinite distance scale indicated by the letter and the index 1027a on the index member 1027 provided on the exterior ring 1002. In such a case, the position of the exterior ring 1002 in the direction around the optical axis with respect to the main body cylinder 1005 is adjusted, and the infinite distance scale of the scale member 1023 and the index 1027a on the exterior ring 1002 side are obtained as shown in FIG. It is necessary to make it completely fixed after matching.

  For this reason, in this embodiment, the following adjustment structure is provided so that the position of the exterior ring 1002 in the direction around the optical axis with respect to the main body tube 1005 can be adjusted. That is, as shown in FIGS. 5 and 6, a long hole provided in the rear end 1002 a of the exterior ring 1002 and extending in a direction around the optical axis through a hole into which a screw 1029 as a mounting member (fastening member) is inserted. 1028. On the other hand, the rear end portion 1005a of the main body cylinder 1005 is formed with a female screw hole portion 1051 as a pilot hole portion that holds the screw 1029 fixedly by tightening the screw 1029. Thus, in the semi-fixed state in which the screw 1029 inserted into the long hole portion 1028 is tightened to some extent with respect to the female screw hole portion 1051, the position of the outer ring 1002 in the direction around the optical axis with respect to the main body tube 1005 is the long hole portion 1028. It can be adjusted in the length range.

  The elongated hole portion in the adjustment structure may be provided in the fastening portion of the outer cylinder 1002, the actuator 1014, and the guide cylinder 1007. Further, the structure in which the outer ring 1002 is mounted and fixed to the main body cylinder 1005 is shown, but the focus ring rotates at the position of the outer ring, the outer cylinder is fixed to the front end portion of the main body cylinder, and the long hole portion is the main body cylinder. It may be provided on the front side. In addition, the scale and the index member are provided around the optical axis of either the outer cylinder or the main body cylinder, and the relative position around the optical axis in the state where the outer cylinder and the main body cylinder are connected to each other. It suffices if it can be adjusted via this.

By providing such an adjustment structure, at the final stage of assembly of the interchangeable lens (a joint tightening stage with the outer ring 1002, the main body cylinder 1005, and the screw 1029 of the mount 1001), the replacement that has been assembled and optically adjusted so far. Without disassembling the lens again, it is possible to adjust the index 1027a on the exterior tube 1002 side to coincide with the in-focus distance to be displayed by the scale member 1023. In addition, this adjustment can be performed simply by manually rotating the outer cylinder 1002 in a semi-fixed state in which the screw 1029 is tightened halfway, and the lens can be manufactured by a simple manufacturing method that does not require a special tool. The device can be manufactured. Therefore, a special tool is not required, and an opening for inserting the tool into the outer cylinder 1002 is not required, and the distance scale of the scale member 1027 and the index on the outer cylinder 1002 side in the almost assembled lens. Positioning (position adjustment) in the direction around the optical axis with 1027a can be easily performed.

  The lens apparatus according to the present embodiment includes a step of attaching the outer tube 1002 to the main body tube 1005 holding the lens, a step of attaching (mounting) the outer tube 1002 to the main body tube 1005 via the screw 1029, a main body tube 1005, It is manufactured through a process of adjusting the relative position with the outer casing 1002 by rotating it around the optical axis. Thereafter, the main body cylinder 1005 and the exterior cylinder 1002 are fixed so as not to move via the screw 1029.

  In the embodiment described above, the case where the elongated hole portion is formed in the exterior member and the prepared hole portion is formed in the main body member has been described. However, the elongated hole portion is provided in one of the exterior member and the main body member. What is necessary is just to provide a pilot hole part in the remaining other member.

  In the above-described embodiment, the interchangeable lens that can be attached to and detached from the camera body has been described. It can also be applied. Further, an adjustment structure similar to that of the above-described embodiment is provided with an integral or interchangeable projection lens of an image projection apparatus (optical apparatus) such as a liquid crystal projector, and a lens barrel (lens apparatus) of an observation optical apparatus such as binoculars and a telescope. ) Is also possible.

  The embodiments described above are merely representative examples, and various modifications and changes can be made to the above-described embodiments when implementing the present invention.

  It is possible to improve the quality and performance of lens devices used in various optical devices.

1001 Mount 1002 Exterior cylinder 1005 Main body cylinder 1006 Cam cylinder 1007 Guide cylinder 1008 to 1011 Lens holding frame 1014 Actuator 1016 Focus ring 1023 Scale member 1024 Rotation transmission ring 1027 Indicator member 1028 Slot 1029 Screw

Claims (8)

A body member holding the lens;
An exterior member attached to the body member;
A mounting member for mounting the exterior member on the main body member in the optical axis direction;
The lens device, wherein the body member and the exterior member can adjust relative positions of the exterior member around the optical axis with respect to the body member via the mounting member.   The lens device according to claim 1, wherein the exterior member represents a relative position between the main body member and the exterior member. A lens device that performs focus adjustment by moving a focus adjustment lens in the optical axis direction,
A body member constituting at least a part of the body of the lens device;
A distance scale for displaying the in-focus distance is provided, and a scale member that rotates around the optical axis in conjunction with the movement of the focus adjustment lens;
A member constituting the external appearance of the lens device, the exterior member being provided on the main body member and provided with a window portion that allows the distance scale to be visually recognized and an index that indicates the in-focus distance on the distance scale When,
A mounting member for mounting the exterior member to the body member;
The exterior member and the body member are optical axes with respect to the body member of the exterior member for adjusting the position of the index with respect to the distance scale in a half-mounted state of the exterior member with respect to the body member by the mounting member. A lens apparatus having an adjustment structure that enables position adjustment in a rotating direction.   The adjustment structure is formed in one member of the exterior member and the main body member so as to extend in the direction around the optical axis, and in the other member of the exterior member and the main body member. The lens device according to claim 3, further comprising a pilot hole portion that holds the mounting member inserted into the elongated hole portion.   The lens apparatus according to claim 3, wherein the mounting member is attached to the exterior member and the main body member from the image side in the optical axis direction. The lens device is an interchangeable lens having a mount that is detachably attached to an optical device,
The lens device according to claim 1, wherein the mounting member mounts the mount and the exterior member on the main body member.   An optical apparatus, wherein the lens device according to any one of claims 1 to 6 is detachable or integrally provided. Attaching the exterior member to the body member holding the lens;
Attaching the exterior member to the body member via a mounting member;
And a step of adjusting the relative position by rotating the relative position between the main body member and the exterior member around the optical axis.