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Image pickup apparatus having lens barrel

a pickup apparatus and lens barrel technology, applied in the field of image pickup apparatus, can solve the problems of inclination of sliding guide bars, large lens barrel size, and difficult miniaturization of lens barrels, so as to avoid the decentering and inclination of each optical uni

Inactive Publication Date: 2011-03-24
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The design achieves a compact zoom lens barrel that effectively prevents decentering and inclinations of optical units, even with large movement amounts and intervals, maintaining high precision and avoiding the size and rigidity issues associated with long guide bars.

Problems solved by technology

As a result, it becomes difficult to miniaturize the lens barrel.
In addition, in order to secure the rigidity of the cantilever guide bar, it is necessary to make large the support configured to cantilever the guide bar and to increase a diameter of the guide bar itself, causing a large size of the lens barrel.
Moreover, when the sliding guide bar is used, the number of components used to hold the guide bar increases, the sliding guide bar and the optical unit guided by the sliding guide bar may incline due to scattering manufacturing errors of the components.

Method used

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  • Image pickup apparatus having lens barrel
  • Image pickup apparatus having lens barrel
  • Image pickup apparatus having lens barrel

Examples

Experimental program
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Effect test

first embodiment

[0024]FIG. 1 illustrates an exploded multistage (two-stage) retractable lens barrel for a digital still camera (image pickup apparatus) according to a first embodiment of the present invention. FIGS. 2, 3, and 4 illustrate sections of a retraction state, a wide-angle end state, and a telephoto end state of the lens barrel, respectively. In FIGS. 2 and 3, reference numeral 100 denotes a camera body (image pickup apparatus body), and reference numeral 101 denotes an image pickup device configured to photoelectrically convert an object image formed by an image pickup optical system in the lens barrel.

[0025]In FIG. 1, L1 denotes a first lens unit, and L2 denotes a second lens unit. L3 denotes a third lens unit that serves as an image stabilization optical system configured to shift in a plane orthogonal to the optical axis and for an image stabilization correction. L4 denotes a fourth lens unit, and L5 denotes a fifth lens unit configured to move in the optical axis direction for focusi...

second embodiment

[0077]Referring now to FIG. 11, a description will be given of a holding method of the guide bars 14a to 14d different from a holding method of the first embodiment.

[0078]As illustrated in FIG. 11, the key ring 12 that serves as a second bar holder has bar receivers 12b to 12e, and these bar receivers 12b to 12e hold one ends of the guide bars 14a to 14d as rod-shaped guide members. In addition, the bar holder 10 that serves as a first bar holder has bar receivers 10b to 10e, and these bar receivers 10b to 10e hold the other ends of the guide bars 14a to 14d.

[0079]Each of the key ring 12 and the bar holder 10 is a separate member from the linear movement guidance cylinder 9 but fixed integrally with the linear movement guidance cylinder 9. Therefore, the key 12a and the bar receivers 10b to 10e, 12b to 12e can be considered to be provided to the linear movement guidance cylinder 9, and the guide bars 14a to 14d may be considered to be held by the linear movement guidance cylinder 9...

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PUM

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Abstract

An image pickup apparatus includes a lens barrel. The lens barrel is configured to move first and second optical units in an optical axis direction for zooming. The lens barrel includes a linear movement cylinder that includes a key configured to guide the first optical unit, a rotation cylinder that includes an outer circumferential cam and an inner circumferential cam, the rotation cylinder being configured to rotate around an optical axis so as to move the first optical unit in the optical axis direction through the outer circumferential cam and so as to move the second optical unit in the optical axis direction through the inner circumferential cam, and a guide bar held by the linear movement cylinder and configured to guide the second optical unit in the optical axis direction.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image pickup apparatus that includes a multistage retractable lens barrel.[0003]2. Description of the Related Art[0004]An image pickup apparatus, such as a digital still camera and a video camera, needs a high magnification of an image pickup lens and a miniaturization of a lens barrel configured to house the image pickup lens is required.[0005]However, along with the high magnification of the image pickup lens, the number of optical units, such as a lens unit of the image pickup lens, and a moving amount of the optical unit are likely to increase and the sensitivity to the decentering or inclination of each optical unit becomes higher. As a result, it becomes difficult to miniaturize the lens barrel.[0006]Japanese Patent No. 3898827 discloses a retractable lens barrel configured to guide the optical unit in the optical axis direction using a cantilever guide bar. In the lens barrel o...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B7/04
CPCG02B7/102
Inventor KATO, YUICHIRO
Owner CANON KK