ZOOM LENS - BOLYMEDIA HOLDINGS CO LTD

Title:

ZOOM LENS

Document Type and Number:

WIPO Patent Application WO/2015/180121

Kind Code:

A1

Abstract:

A zoom lens comprises a focus driving mechanism and a zoom driving mechanism and corresponding lens groups. The zoom driving mechanism is sleeved outside the focus driving mechanism. The focus driving mechanism is a voice coil motor and comprises a focus stator assembly (7a1) and a focus rotor assembly (7a2) that are connected by means of an elastic connection member (7a3). One of a focus stator sleeve (7a11) in the focus stator assembly and a focus rotor sleeve (7a21) in the focus rotor assembly is a permanent magnet sleeve, and the other of the focus stator sleeve (7a11) and the focus rotor sleeve (7a21) is a non-magnet sleeve, and the assembly to which the non-magnet sleeve belongs further comprises a preliminary magnetic member (7a22) and a driving coil (7a23). Due to the magnetic force pre-existing between the preliminary magnetic member and the permanent magnet sleeve, the elastic connection member is in a force balanced state without electrification, so that a smaller electromagnetic force is required for driving the elastic connection member, and accordingly the driving current and power consumption are reduced. Moreover, because the zoom driving mechanism is sleeved outside the focus driving mechanism, a large aperture can be easily realized, and installation and implementation are easier.

Inventors:

HU XIAOPING (CN)

Application Number:

PCT/CN2014/078898

Publication Date:

December 03, 2015

Filing Date:

May 30, 2014

Export Citation:

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Assignee:

BOLYMEDIA HOLDINGS CO LTD (US)
HU XIAOPING (CN)

International Classes:

G02B7/04; H02K33/00

Foreign References:

CN101951467A	2011-01-19
CN102820759A	2012-12-12
CN201063067Y	2008-05-21
CN103529534A	2014-01-22
CN103777305A	2014-05-07
CN102590979A	2012-07-18
JP2009100595A	2009-05-07
US20080024016A1	2008-01-31

Other References: