JP-7855372-B2 - optical equipment

JP7855372B2JP 7855372 B2JP7855372 B2JP 7855372B2JP-7855372-B2

Inventors

長岡信幸

Assignees

キヤノン株式会社

Dates

Publication Date: 20260508
Application Date: 20220308

Claims (9)

A first movable lens barrel that holds a first optical element, A second movable lens barrel that holds a second optical element, A base member that limits the range of movement of the first movable lens barrel in the optical axis direction, The cushioning material provided in the first movable lens barrel, It comprises first and second guide members that guide the movement of the first and second movable lens barrels in the respective optical axis directions , The first and second movable lens barrels are arranged adjacent to each other in the optical axis direction. The respective ranges of movement of the first and second movable lens barrels in the optical axis direction overlap with each other. The second movable lens barrel and the base member are in contact with the same surface of the cushioning material. An optical device characterized in that, when viewed from the direction of the optical axis, the axes passing through the optical axis and the first and second guide members, respectively, are defined as the first and second axes, and the region in which the angle formed by the first and second axes is 180 degrees or less is defined as the first region, and the contact surfaces of the cushioning material and the base member are arranged in the first region .
The base member is in contact with multiple positions on the cushioning material, The optical instrument according to claim 1, characterized in that, when viewed from the direction of the optical axis, the respective centers of gravity of the first and second movable lens barrels are included in the region connecting the plurality of positions.
The optical device according to claim 1, characterized in that the base member abuts against first and second positions on opposite sides of the optical axis in the cushioning material.
The cushioning material includes the first and second cushioning materials, The optical device according to claim 1, characterized in that the contact surfaces of the first cushioning material and the base member are located near the first axis, and the contact surfaces of the second cushioning material and the base member are located near the second axis.
A first movable lens barrel that holds a first optical element, A second movable lens barrel that holds a second optical element, A base member that limits the range of movement of the first movable lens barrel in the optical axis direction, The first and second cushioning materials provided in the first movable lens barrel, It comprises first and second guide members that guide the movement of the first and second movable lens barrels in the respective optical axis directions , The first and second movable lens barrels are arranged adjacent to each other in the optical axis direction. The respective ranges of movement of the first and second movable lens barrels in the optical axis direction overlap with each other. The second movable lens barrel and the base member are in contact with the same surface of the first and second cushioning materials. An optical instrument characterized in that, when viewed from the direction of the optical axis, the axes passing through the optical axis and the first and second guide members, respectively, are defined as the first and second axes, the contact surface of the first cushioning material and the base member is positioned near the first axis, and the contact surface of the second cushioning material and the base member is positioned near the second axis.
The cushioning material includes the first and second cushioning materials, The first movable lens barrel and the second movable lens barrel have a common third guide portion. When viewed from the direction of the optical axis, the axis passing through the optical axis and the third guide portion is defined as a predetermined axis, The contact surfaces of the first cushioning material and the base member are arranged in the first region between the first axis and the second axis. The optical device according to claim 1 , characterized in that the contact surfaces of the second cushioning material and the base member are arranged near the predetermined axis.
The optical instrument according to any one of claims 1 to 6 , characterized in that it has first and second driving means for driving the first and second movable lens barrels in the direction of the optical axis, respectively.
The optical device according to claim 7 , characterized in that the base member holds the first and second driving means.
The optical instrument according to any one of claims 1 to 8 , characterized in that it is detachable from the imaging device.

Description

This invention relates to optical instruments such as lens barrels. To shorten the minimum focusing distance or improve close-up image quality, techniques are known to move multiple lens groups during focusing. One such technique involves moving each lens group using separate drive mechanisms. This method, known as linear motion, directly moves the lens groups using drive mechanisms such as VCMs or ultrasonic motors. In linear drive systems, the typical configuration involves a guide bar (a fixed part) and guide holes in the lens barrel guiding the movement in a straight line. Furthermore, linearly driven lens barrels, when not energized, can collide with the base component at their moving end, potentially resulting in a significant impact. For example, Patent Document 1 describes a buffer section between the body and the lens barrel. This buffer section is positioned to protrude toward the body on the side of the lens barrel's movement and at both ends of the guide section, thereby mitigating the impact when the lens barrel collides with the mechanical end. Patent Document 2 describes a design in which, in two adjacent movable lens barrels, one of the movable lens barrels is equipped with a biasing member that can be compressed in the optical axis direction when the lens barrels come into contact with each other, thereby mitigating the impact caused by collisions between the lens barrels during rapid zoom operations. Patent No. 5307773Patent No. 4991455 This is a cross-sectional view of the lens barrel of Example 1.Figure 1 is an exploded perspective view of the main part of the lens barrel.This is a diagram of the main part as seen from the X2 direction of the optical axis.This is a diagram of the main parts with the rear group cover and cover members removed.(A) and (B) are cross-sectional views of the main part at the object-side end and the image plane-side end.(A) and (B) are diagrams illustrating the arrangement of the cushioning material.This is an explanatory diagram illustrating the arrangement of the first movable lens barrel and the buffer material as viewed from the optical axis direction.This is an explanatory diagram illustrating the arrangement of the main components as viewed from the X2 direction of the optical axis.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in Example 1.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in a modified example of Example 1.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in Example 2.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in a modified example of Example 2.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in Example 3.This is a schematic diagram of the arrangement of the main components as viewed from the optical axis direction in Example 4. The embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. In each figure, the same reference numeral is used for identical members or elements, and redundant explanations are omitted or simplified.