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Retractable lens barrel with high shock resistance

A technology of a lens barrel and a barrel member, which is applied in the field of retractable lens barrels, can solve problems such as obstructing the optical equipment of the lens barrel, and achieve the effect of improving impact resistance.

Inactive Publication Date: 2011-03-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, according to the technology described in Japanese Patent Application Laid-Open (Kokai) No. 2005-128188, the movable cam ring is long in the optical axis direction, so this prevents the lens barrel and the optical device having the lens barrel, such as the miniaturization

Method used

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  • Retractable lens barrel with high shock resistance
  • Retractable lens barrel with high shock resistance
  • Retractable lens barrel with high shock resistance

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Embodiment Construction

[0018] The present invention will now be described in detail with reference to the accompanying drawings showing embodiments of the invention.

[0019] Figure 1A with Figure 1B is an external perspective view showing a digital camera having a retractable lens barrel according to an embodiment of the present invention, wherein, Figure 1A shows the retracted state of the retractable lens barrel, while Figure 1B The extended state of the retractable lens barrel is shown.

[0020] refer to Figure 1A with Figure 1B , an auxiliary light window 33A, a viewfinder window 34A, a flash window 35A, and a retractable lens barrel 36 are mounted on the front of the digital camera 100 .

[0021] During photometry and distance measurement, auxiliary light is emitted to the subject from the auxiliary light window 33A. An optical image of a subject is taken into the camera from a viewfinder window 34A, and the image of the subject can be viewed through a viewfinder eyepiece 34B provided...

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PUM

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Abstract

A retractable lens barrel that improves shock resistance without obstructing miniaturization. In the retractable lens barrel, pins formed in the lens barrel are engaged with grooves formed in a cam ring, and the lens barrel is caused to move in a direction of an optical axis by rotation of the cam ring. The pins include a cam pin for moving the lens barrel, and a slip-off preventive pin for preventing the cam pin from slipping off the groove. The grooves include a cam groove with which the cam pin is engaged, and a slip-off preventive groove with which the slip-off preventive pin is engaged. In an area close to a retracted position of the lens barrel, the cam groove and the slip-off preventive groove overlap to be shared grooves with which the cam pin and the slip-off preventive pin are engaged.

Description

technical field [0001] The invention relates to a retractable lens barrel, in particular to a zoom mechanism in which a cam pin is engaged with a cam groove. Background technique [0002] Conventionally, an optical device such as a digital camera having a retractable zoom lens barrel (hereinafter referred to as a retractable lens barrel) has been widely used. As a zoom lens extension mechanism in a retractable lens barrel, there is known a drive mechanism that engages a cam pin formed in the lens barrel with a cam groove formed in a movable cam ring and rotatably drives the movable cam ring. The cam ring moves the lens barrel back and forth in the direction of the optical axis along the cam groove. In such a zoom lens extension mechanism in which the cam pin engages with the cam groove, it is necessary to prevent the cam pin from slipping off from the cam groove when an external force is applied so that the lens barrel cannot move back and forth. [0003] For example, Japa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/04G02B7/02
CPCG03B3/00G02B7/023G02B7/04G02B7/026G03B17/04
Inventor 大屋贵弘
Owner CANON KK
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