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Camera lens positioning using an electro-active device

A lens positioning and camera technology, applied in the field of cameras, can solve the problem that the device cannot be made sufficiently sophisticated, and achieve the effect of low manufacturing cost

Inactive Publication Date: 2004-11-10
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such devices cannot be made compact enough to be used for camera lens positioning

Method used

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  • Camera lens positioning using an electro-active device
  • Camera lens positioning using an electro-active device
  • Camera lens positioning using an electro-active device

Examples

Experimental program
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Embodiment Construction

[0036] According to the invention, a camera with a moving lens is provided with electrosensitive means for positioning the lens. For clarity, the electro-sensitive device is described first, and the camera as a whole is then described.

[0037] In the following description, electrosensitive devices are described with reference to imaginary minor and major axes, which are nevertheless useful for observing and defining the device.

[0038] figure 1A first electrosensitive device 1 of the invention is shown. The device 1 comprises a structure consisting of a continuous electrosensitive element 2 bent in a helical shape around a minor axis 3 along which the entire structure extends. Minor axis 3 is curved and runs along a plane perpendicular to minor axis 3 that is figure 1 The circular arc curve of the geometric major axis 4 in the outward direction of the middle paper faces. When the curve of the minor axis 3 is a planar curve, the thickness of the device parallel to the maj...

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PUM

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Abstract

A camera (30) uses an electro-active device (11) to position a movable lens. The electro-active device (11) comprises an electro-active structure in the form of a continuous electro-active member (12) curving in a helix around a minor axis (13) which is in itself curved for example in a helix around a major axis (14). The continuous member (12) has a bender construction of a plurality of layers (21 and 22) including at least one layer of electro-active material so that it bends, on activation, around the minor axis (13). Concomitantly with the bending, the electro-active structure twists around the minor axis. Concomitantly with that twisting, relative displacement of the ends (16) of the device (11) occurs due to the combination of the twisting around the minor axis (13) and the fact that the minor axis (13) is curved. This structure of the electro-active device (11) is compact and provides for linear displacement, thereby making it suitable for positioning the lens of the camera (30).

Description

technical field [0001] The invention relates to a camera using electro-sensitive means to position the lens. Background technique [0002] The camera lens needs to be moved to focus and zoom. Otherwise, the camera is limited to obtaining sufficient focusing range by having a lens with a small aperture. Although the position of the lens can be adjusted manually, it is desirable to implement motorized adjustment. [0003] To drive a camera lens, it is known to use electric coil motors. However, such motors are relatively expensive and are generally only used in high-end cameras. Also, electric coil motors are relatively bulky, so the use of electric coil motors limits the miniaturization of the camera. [0004] Recent advances in CCD and CMOS imaging technologies have enabled the development of small and inexpensive digital cameras. However, because existing small lens positioning systems are too expensive relative to cameras, these cameras are rarely equipped with autofo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B3/10G02B7/02G02B7/08G03B13/34G03B17/00G03B17/04H04N5/225
CPCG02B7/023H04N5/2254G03B17/00H04N23/55H04N23/673G03B3/02
Inventor G·麦科维特A·胡利J·阿伦D·H·皮尔斯U·R·勒内尔