US-12625343-B2 - Lens apparatus and image pickup apparatus having the same

US12625343B2US 12625343 B2US12625343 B2US 12625343B2US-12625343-B2

Abstract

The lens apparatus comprises a second lens barrel configured to hold a lens, a first guide bar configured to guide the second lens barrel in an optical axis direction, a bar holding member that holds one end side of the first guide bar, a cam follower engaged with the bar holding member and including a portion eccentric with respect to a rotation axis, and a first fixing member configured to hold the bar holding member via the cam follower. A position on of the one end side of the first guide bar in a plane perpendicular to the optical axis is adjustable by rotating the cam follower with respect to the fixing member from a direction orthogonal to a direction along the optical axis of the lens.

Inventors

Katsuhiro Inoue

Assignees

CANON KABUSHIKI KAISHA

Dates

Publication Date: 20260512
Application Date: 20230501
Priority Date: 20220516

Claims (11)

1 . A lens apparatus comprising: a holding frame configured to hold a lens; a guide member configured to guide the holding frame in an optical axis direction; a first holding member configured to hold one end side of the guide member; a first engaging member configured to engage with the first holding member; and a first fixing member configured to hold the first holding member via the operating first engaging member, wherein the first engaging member includes a first cylindrical portion, a second cylindrical portion, and a third cylindrical portion, wherein axes of the first cylindrical portion and the second cylindrical portion are eccentric, and axes of the first cylindrical portion and the third cylindrical portion are coaxial, wherein the first fixing member includes a first regulating portion that engages with the first cylindrical portion and a first groove portion that engages with the second cylindrical portion, wherein the first regulating portion regulates movement of the first engaging member in the optical axis direction, wherein the first groove portion penetrates the first fixing member from an outer periphery to an inner periphery of the first fixing member, and wherein a position of the one end side of the guide member in a direction perpendicular to an optical axis is adjustable by rotating the first engaging member with respect to the first fixing member.
2 . The lens apparatus according to claim 1 , wherein the first holding member includes a second regulating portion, a third regulating portion, and an engaging portion that engages with the third cylindrical portion, wherein the first fixing member has a fourth regulating portion which engages with the second regulating portion to regulate the movement of the first holding member in the optical axis direction, and a first guide portion which engages with the third regulating portion and is parallel to the optical axis, wherein the first regulating portion, the first groove portion, the fourth regulating portion, and the first guide portion are provided at different angular positions around the axis of the guide member, and wherein, when a plane orthogonal to the optical axis is divided into four quadrants by a horizontal line segment passing through the optical axis and a vertical line segment passing through the optical axis, the fourth regulating portion and the first guide portion are located in a quadrant including the first regulating portion and the first groove portion.
3 . The lens apparatus according to claim 1 , further comprising a fastening member for fastening the first engaging member to the first holding member, wherein the first engaging member is fastened to the first holding member by the fastening member after the adjustment of the first holding member.
4 . The lens apparatus according to claim 1 , wherein the first engaging member is provided with a cutout portion to be engaged with a tool for rotating the first engaging member, and wherein a direction in which the cutout portion extends is a mark for distinguishing a direction in which the second cylindrical portion is decentered.
5 . The lens apparatus according to claim 1 , further comprising a biasing member, wherein the first holding member receives a rotational force around an axis of the guide member and a biasing force in the optical axis direction from the biasing member.
6 . The lens apparatus according to claim 1 , further comprising: a second holding member configured to hold an opposite end side of the guide member; a second engaging member configured to engage with the second holding member, and a second fixing member configured to hold the second holding member via the second engaging member, wherein a position of the other end side of the guide member in a direction perpendicular to the optical axis is adjustable by rotating the second engaging member with respect to the second fixing member.
7 . The lens apparatus according to claim 6 , wherein the second fixing member includes a fifth regulating portion that engages with the second regulating portion of the second holding member to regulate movement of the second holding member in the optical axis direction, a second guide portion that engages with the third regulating portion of the second holding member and is parallel to the optical axis, a sixth regulating portion that engages with the first cylindrical portion of the second engaging member, and a second groove portion that engages with the second cylindrical portion of the second engaging member and is inserted from the outer periphery to the inner periphery of the second fixing member.
8 . An image pickup apparatus comprising: the lens apparatus according to claim 1 ; and an image pickup element configured to capture an image formed by the lens apparatus.
9 . The image pickup apparatus according to claim 8 , wherein the lens apparatus is detachable from the image pickup apparatus.
10 . A lens apparatus comprising: a holding frame configured to hold a lens; a guide member configured to guide the holding frame in an optical axis direction; a first holding member configured to hold one end side of the guide member; a first engaging member configured to engage with the first holding member; a first fixing member configured to hold the first holding member via the first engaging member; a second holding member configured to hold an opposite end side of the guide member; a second engaging member configured to engage with the second holding member; and a second fixing member configured to hold the second holding member via the second engaging member, wherein a position of the one end side of the guide member in a direction perpendicular to an optical axis is adjustable by rotating the first engaging member with respect to the first fixing member, and wherein a position of the other end side of the guide member in a direction perpendicular to the optical axis is adjustable by rotating the second engaging member with respect to the second fixing member.
11 . An image pickup apparatus comprising: the lens apparatus according to claim 10 ; and an image pickup element configured to capture an image formed by the lens apparatus.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present disclosure relates to a lens apparatus and an image pickup apparatus having the same. Description of the Related Art Description of the Related Art Conventionally, in a lens barrel of an image pickup apparatus such as a digital camera, tilt adjustment or eccentricity adjustment of a lens holding frame that holds a lens is required in order to bring out desired optical performance. Japanese Patent Application Laid-Open No. 2009-150950 discloses an adjustment mechanism in which a bearing member for supporting one end of a guide shaft is composed of a first bearing member and a second bearing member, and the eccentric amount and eccentric direction of the guide shaft can be independently adjusted by adjusting the rotational positions of the first bearing member and the second bearing member. However, in Japanese Patent Application Laid-Open No. 2009-150950, in order to adjust the tilt of the guide shaft, it is necessary to access the first bearing member and the second bearing member incorporated from the optical axis direction by an adjustment tool from one side in the optical axis direction. With this configuration, a space for adjustment is required on the side opposite to the lens frame suspended by the guide shaft, and thus there is a concern that the lens barrel may be increased in size. SUMMARY OF THE INVENTION An aspect of embodiments provides, a lens apparatus advantageous in optical adjustment. According to an embodiment of the present disclosure, a lens apparatus comprising: a holding frame configured to hold a lens; a guide member configured to guide the holding frame in an optical axis direction; a holding member that holds one end side of the guide member; an operating member engaged with the holding member and including a portion eccentric with respect to a rotary axis; and a fixing member configured to hold the holding member via the operating member, wherein a position of the guide member on one end side in a plane perpendicular to an optical axis is adjustable by rotating the operating member with respect to the fixing member from a direction orthogonal to a direction along the optical axis of the lens. Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view of a lens apparatus (100) according to embodiment 1. FIG. 2 is a partial sectional view of the periphery of the bar holding member (108). FIG. 3 is a cross-sectional view showing a state where the cam follower (110) is fastened to the bar holding member (108). FIG. 4 is a side view of the cam follower (110). FIG. 5 is a plan view of the first fixing member (105) as viewed from the Z direction. FIG. 6A is a perspective view of the first adjustment mechanism as viewed from the inside of the first fixing member (105). FIG. 6B is a partial cross-sectional view of a portion in which the bar holding member (108) is accommodated. FIG. 7 is a perspective view of the first adjustment mechanism as viewed from the outside of the first fixing member (105). FIGS. 8A and 8B are both cross-sectional views of the first fixing member (105) including the first adjustment mechanism. FIG. 9 is a view showing a state in which the biasing member (118) is attached. FIG. 10 is a partial cross-sectional view of a second adjustment mechanism of the lens apparatus (200) according to embodiment 2. FIG. 11 is a plan view of the second fixing member (207) as viewed from the Z direction. FIG. 12 is a perspective view of the second adjustment mechanism as viewed from the inside of the second fixing member (207). FIG. 13 is a schematic diagram illustrating a configuration embodiment of an image pickup apparatus. DESCRIPTION OF THE EMBODIMENTS Preferred embodiments of the present invention will now be described in detail in accordance with the accompanying drawings. In drawings, an optical axis direction along an optical axis OA is defined as an X direction, a vertical direction in FIG. 1 orthogonal to the X direction is defined as a Z direction, and a direction orthogonal to both the X direction and the Z direction is defined as a Y direction. Embodiment 1 Hereinafter, a lens apparatus 100 according to a first embodiment of the present disclosure will be described with reference to FIG. 1. FIG. 1 is a schematic cross-sectional view of a lens apparatus 100 according to a first embodiment of the present disclosure. The optical axis direction of the lens apparatus 100 is regulated by the diameter of the mount barrel 102 being fitted to the mount 101, which is detachable from a camera body (not illustrated), and being in contact therewith in the optical axis direction. The mount barrel 102 is diameter-fitted to the exterior barrel 103, and is regulated in the optical axis direction by abutting in the optical axis direction. The mount barrel