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Lens barrel and imaging device

A technology of lens barrel and cam, applied in installation, optics, instruments, etc., can solve the problems of increased sliding resistance between cam pins and cam grooves, increased cam pin size, etc., and achieve the effect of ensuring strength

Active Publication Date: 2014-08-06
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, when a large external force is applied to the lens barrel, the cam pin may be damaged, so the size of the cam pin may be increased in consideration of the damage.
[0007] However, if the size of the cam pin is increased, the contact area between the cam pin and the cam groove increases, and the sliding resistance generated between the cam pin and the cam groove increases.

Method used

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  • Lens barrel and imaging device
  • Lens barrel and imaging device
  • Lens barrel and imaging device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0058] (1: Structure of digital camera)

[0059] like figure 1 As shown, a lens barrel 1 is mounted on a digital camera 2 (an example of an imaging device). The lens barrel 1 includes various lenses such as a varifocal lens and a focus lens, an imaging element that converts incident light into an electrical signal and outputs it, and the like. In addition, the digital camera 2 is a digital still camera and is an example of an imaging device. As the imaging device, in addition to digital still cameras, optical devices such as digital video cameras and mobile phones with cameras are also conceivable.

[0060] like figure 2 and image 3 As shown, the lens barrel 1 has an optical system (not shown), an imaging element (not shown), a motor unit 70, a fixed frame 10 (an example of a first support frame), a drive frame 20 (an example of a second support frame) ), straight into frame 30 (refer to image 3 ), the first lens group unit 40, the second lens group unit 50 (refer to ...

no. 2 approach

[0107] In the first embodiment, the cam follower 22 has the first cam portion 22a, the second cam portion 22b, and the connection portion 22c, but Figure 9 (A)~ Figure 9 The cam follower shown in (C) can also reduce sliding resistance.

[0108] like Figure 9 (B) and Figure 9As shown in (C), the drive frame 120 has the drive frame main body 24 and the cam follower 122 described in the first embodiment. The cam follower 122 (an example of a cam member) is made of metal, and is embedded in the drive frame main body 24, for example. The cam follower 122 has an embedding portion 122a, a washer 122b, a sliding portion 122c, and a step portion 122d. The embedded portion 122 a is embedded in the drive frame main body 24 . The sliding portion 122c and the stepped portion 122d are inserted into the cam groove 112 (an example of a cam guide groove). The sliding portion 122c is arranged to be slidable with the cam groove 112 . The stepped portion 122d is arranged with a gap G3 ...

no. 3 approach

[0113] and, Figure 10 (B) and Figure 10 The cam follower 222 shown in (C) can also reduce sliding resistance.

[0114] like Figure 10 (B) and Figure 10 As shown in (C), the drive frame 220 has the drive frame main body 24 and the cam follower 222 described in the first embodiment. The cam follower 222 (an example of a cam member) has a base portion 222a, a slide portion 222b, and a step portion 222c. The cam follower 222 is integrally formed with the drive frame main body 24 made of resin. The cam follower 222 is inserted into the cam groove 212 (an example of a cam guide groove). The sliding portion 222b is arranged to be slidable with the cam groove 212 . The stepped portion 222c is arranged with a gap G4 between the cam groove 112 and the cam groove 112 .

[0115] Specifically, the stepped portion 222c has a base portion 222e protruding outward in the radial direction from the drive frame main body 24, and an intermediate portion 222f connecting the base portion ...

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Abstract

The present invention provides a lens barrel capable of ensuring smooth movement while ensuring strength. The lens barrel (1) includes a fixed frame (10) and a drive frame (20), and the fixed frame (10) has a cam groove (12). The driving frame (20) has an annular driving frame main body (24) and a cam follower (22) protruding radially from the driving frame (24) and inserted into the cam groove (12). The cam follower (22) has a first cam portion (22a), a second cam portion (22b) and a connecting portion (22c). The first cam portion (22a) is configured to be slidable with the cam groove (12). The second cam portion (22b) is arranged to be slidable with the cam groove (12). The connecting portion (22c) connects the first cam portion (22a) and the second cam portion (22b), and is spaced apart from the cam groove (12).

Description

technical field [0001] The technology disclosed in the present invention relates to a lens barrel that can be mounted on imaging devices such as digital still cameras, digital video cameras, and mobile phones with cameras. Background technique [0002] An imaging device such as a digital still camera includes, for example, a camera body and a lens barrel supported by the camera body. As the lens barrel, there is known a so-called sinker type (sink type) lens barrel. The sunken lens barrel accommodates an optical system including a varifocal lens, and is disposed so as to be transportable in the direction of the optical axis with respect to the camera body. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2003-315660 [0004] For example, the lens barrel described in Patent Document 1 includes a holding frame that holds a lens, and a cam ring that supports the holding frame so as to be movable. The cam ring 3 has three cam grooves, and the holding frame has three ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B7/04G03B17/12
CPCG02B15/14G02B7/102G02B7/10
Inventor 科野文男宇野哲哉平林晃一郎小西章雄
Owner PANASONIC CORP
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