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Optical apparatus

An optical device and optical system technology, applied in the field of zoom lens, can solve problems such as difficult to smoothly correct the meshing position and meshing range

Inactive Publication Date: 2009-02-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to smoothly correct the engagement position and engagement range of the focus drive cam and the follower provided on the focus lens at each focal length

Method used

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  • Optical apparatus
  • Optical apparatus
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Embodiment Construction

[0017] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0018] Figure 4 The external structure of a single-lens reflex camera (imaging device) including an optical device (lens device) according to an embodiment of the present invention is illustrated. The camera includes a lens device 1 serving as an optical device, and a camera body 2 to which the lens device 1 is detachably attached. The lens device 1 is connected to the camera mount 3 by bringing the base 101 included in the lens device 1 into contact with the camera mount 3 . FIG. 1 illustrates the overall structure of a lens device according to an embodiment of the present invention, and FIG. 2 is an expanded view of a lens driving mechanism of the lens device 1 shown in FIG. 1 at a wide-angle end.

[0019] The lens apparatus 1 according to the present embodiment has a 6-unit structure including 6 lens units L1 to L6. All lens units L1 to L6 move along...

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PUM

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Abstract

An optical device consists of focusing lens unit, the first cam unit rotating around light axle and moving along light axle in multiplying power variation course, focusing cam unit for driving said focusing lens unit, speed variation unit for varying relative rotation speed of said focusing lens unit to the first cam unit in multiplying power variation operation, driving unit being able to rotate around light axle relatively to the first cam unit, speed variation cam unit for varying rotary speed and direction of said focusing lens unit.

Description

technical field [0001] The present invention relates to a zoom lens, and more particularly, the present invention relates to a lens driving apparatus for driving an optical zoom lens called an inner focus zoom lens or a rear focus zoom lens. Background technique [0002] Inner focus (or rear focus) zoom lenses in which a lens unit other than the front lens unit is moved for focusing are known. [0003] In a typical inner focus zoom lens, by reducing the diameter of the front lens unit on the object side, the size of the overall lens apparatus can be reduced. In addition, by reducing the weight of the focus lens, the speed of autofocus (hereinafter referred to as AF) can be increased. In addition, the light-shielding effect and operability of the filter can be improved by using the non-rotating front lens unit. [0004] Generally, in an inner focus zoom lens, it is necessary to change the movement amount of the focus lens in accordance with a change in focal length that occ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/14
Inventor 柏叶圣一
Owner CANON KK