WO2009009949A1

WO2009009949A1 - Magnetic controlled zoom lens module

Info

Publication number: WO2009009949A1
Application number: PCT/CN2008/001092
Authority: WO
Inventors: Pao-Chyuan Chen
Original assignee: New Ken Technologies Co., Ltd.
Priority date: 2007-07-13
Filing date: 2008-06-04
Publication date: 2009-01-22
Also published as: CN101344634A

Abstract

A magnetic controlled zoom lens module comprises a lens assembly (21), a base (22), a lens base (23), a cam mechanism (24), and at least one magnetic control unit (25). The lens assembly has an optical axis (OA). The base is provided with a received recess (221) extending along the optical axis. The lens base is disposed within a received recess and can rotate about the optical axis, and the lens assembly is disposed within the lens base along the optical axis. A cam mechanism is disposed at the interface surface between the lens base and the base, in order that while the lens base rotates relative to the base, it simultaneously moves along the optical axis relative to the base. The magnetic control unit comprises a magnet (251) disposed on the lens base and an electromagnetic coil (252) disposed on the base. The magnet is subjected to the magnetic force of the electromagnetic coil and drives the lens base to rotate about the optical axis within the received recess. When the lens base along with the lens assembly is rotating, they move along the optical axis relative to the base via the cam mechanism.

Description

Controlled zoom lens module

The present invention relates to a lens module, and more particularly to a lens module that uses a magnetic force to control a lens group to move for zooming. Background technique

Lens modules used in information electronics, such as lens modules for mobile phones or PDAs, are often used in digital cameras due to factors such as overall product size and cost, and are driven by stepping motors with gears to drive the mirrors. The auto zoom device is manually adjusted to adjust the lens movement for zooming.

However, for the user, manual zooming is of course not an ideal operation. Therefore, how to design a small-sized and cost-effective automatic zoom lens module for use in information electronics has become a relevant The direction that the industry is actively developing. Summary of the invention

It is an object of the present invention to provide a magnetron zoom lens module that is small in size and cost-effective. The magnetron zoom lens module of the present invention comprises: a mirror group, a base, a mirror base, a cam mechanism, and at least one magnetic control unit; the mirror group has an optical axis; and the base forms an axial axis along the optical axis An extending accommodating groove; the lens holder is axially rotatably disposed around the optical axis in the accommodating groove and is disposed axially about the optical axis; the cam mechanism is disposed adjacent to the pedestal and the pedestal for the mirror When the base rotates relative to the base, the lens holder can simultaneously move axially relative to the base along the optical axis; the magnetron unit has a magnet disposed on the lens holder and an electromagnetic coil disposed on the base, and the iron is substantially along the electromagnetic coil The magnetic force in the radial direction of the optical axis drives the lens holder to rotate axially around the optical axis in the accommodating groove.

The invention has the beneficial effects that: by the cooperation of the cam mechanism and the magnetic control unit, the lens holder can move axially relative to the base along the optical axis while rotating relative to the base. DRAWINGS

1 is an exploded perspective view of a preferred embodiment of a magnetron zoom lens module of the present invention;

Figure 2 is a perspective assembled view of the preferred embodiment;

Figure 3 is a perspective view of the base of the preferred embodiment;

Figure 4 is a perspective view of the lens holder of the preferred embodiment;

Figure 5 is a schematic view of the preferred embodiment illustrating the relative movement of the base and the lens holder;

Figure 6 is a schematic view of the preferred embodiment. detailed description

The present invention will be described in detail below with reference to the accompanying drawings and embodiments:

As shown in FIG. 1 and FIG. 2, a preferred embodiment of the magnetron zoom lens module of the present invention comprises a lens assembly 21, a base 22, a lens holder 23, a cam mechanism 24, two magnetic control units 25, and a 3⁄4 cover 26, and an elastic member 27.

The lens assembly 21 houses at least one focusing lens in a barrel, and the lens barrel is generally cylindrical in axial direction extending along the optical axis OA of the lens. A thread 211 is formed on the outer peripheral wall of the lens barrel.

As shown in FIG. 1 and FIG. 3, the susceptor 22 defines a receiving groove 221. The accommodating groove 221 generally defines a cylindrical space extending axially along the optical axis OA, and has two radial extensions along the optical axis OA. The scallop 222.

The lens holder 23 is substantially in the shape of an annular shape extending along the optical axis OA and having an inner circumferential wall and a shape of the lens assembly 21, and is rotatably disposed in the accommodating groove 221 of the base 22 along the optical axis OA. A thread 231 is formed on the inner peripheral wall of the lens 23, and the thread 211 of the lens group 21 is fitted to be axially screwed therein along the optical axis OA, and the lens holder 23 has two oppositely radiated radially along the optical axis to the two sectors. The ear portion 232 in the 222 can be axially rotated about the optical axis OA in the space defined by the scallop 222.

As shown in FIG. 3 and FIG. 4, the cam mechanism 24 is disposed at a position where the lens holder 23 and the base 22 abut each other, and each has three formed on the lens holder 23 and axially rotated about the optical axis OA and obliquely facing the base. The extended first inclined surface portion 241, and the second inclined surface portion 242 formed on the base 22 and axially rotated about the optical axis OA and obliquely extending toward the lens holder 23.

As shown in FIG. 5, the first and second inclined surface portions 241, 242 are disposed in cooperative contact with each other, so that when the lens holder 23 is rotated relative to the base 22, the relative movement of the first inclined surface portion 241 and the second inclined surface portion 242 is mirrored. The seat ²³ is simultaneously movable relative to the base 22 in the axial direction of the optical axis (upward direction in the drawing). The inclined surface contacting the first and second inclined surface portions 241 and 242 may be a curved surface with a fixed slope and a curved surface corresponding to the slope.

Further, it should be noted that a wide variety of cam mechanisms for generally changing the rotation to a linear movement can be used instead of the cam mechanism 24 in the present embodiment, and is not limited to the manner disclosed in the embodiment.

As shown in FIG. 1, the base 22 is provided with a winding groove 223 at each of the two outer sides corresponding to the sector 222. The magnetron units 25 each have a magnet 251 disposed in an ear portion 232 of the lens holder 23 and an electromagnetic coil 252 disposed around a winding groove 223.

As shown in FIGS. 1 and 6, the NS magnetic poles of the magnet 251 are disposed along a plane perpendicular to the optical axis OA, and the electromagnetic coil 252 is driven by a power source to emit a magnetic force 3 substantially extending radially along the optical axis OA. When the electromagnetic coil 252 emits a magnetic force B substantially in the radial direction of the optical axis OA as shown in FIG. 6, it will drive the N pole of the magnet 251 toward the direction of the magnetic force B, and drive the S pole of the magnet 251 away from the direction of action of the magnetic force B. , the mirror base 23 can be driven to rotate counterclockwise about the optical axis OA in the receiving groove 221 of the base 22, and vice versa, when the electromagnetic coil 252 is opposite to the optical axis OA as shown in FIG. When the magnetic force B is applied, the lens holder 23 is driven to rotate clockwise around the optical axis OA in the accommodating groove 221 of the susceptor 22. Also, the two stop points in which the ears 232 are rotated clockwise and counterclockwise are respectively defined by the opposite boundaries of the scallops 222.

As shown in FIG. 1 and FIG. 2, the cover 26 is cooperatively covered on the base 22 and is passed through by the lens assembly 21. The elastic member 27 is disposed between the cover 26 and the lens holder 23 for providing the elastic force of the lens holder 23 to be pressed downward in the direction of the base 22, so that the first inclined surface portion 241 of the cam mechanism 24 is surely contacted with the second inclined surface portion 242. on. In the present embodiment, the elastic member 27 is exemplified by a metal elastic gasket. In practice, it may be replaced by a metal spring or a mat made of an elastic rubber such as rubber or silicone.

In summary, the present invention provides the magnet mechanism 251 to the electromagnetic coil by providing the cam mechanism 24 at the abutment of the lens holder 23 and the base 22, and by disposing the magnet 251 on the lens holder 23 and the electromagnetic coil 252 on the base 22. The magnetic force of 252 causes the mirror base 23 to rotate axially about the optical axis OA in the receiving groove 221 of the base 22, and simultaneously drives the mirror group 21 to move axially along the optical axis, without the need for additional stepping motors and gears. The volume can be reduced and the cost can be reduced, and the efficacy of the present invention can be achieved.

Claims

Claim

1. A magnetron zoom lens module comprising:

a mirror group having an optical axis;

a pedestal forming a receiving groove extending axially along the optical axis;

a lens holder that is axially rotatably disposed about the optical axis and disposed in the axial direction of the optical axis;

The lens module further includes: a cam mechanism disposed at a position adjacent to the base of the lens holder for rotating the lens holder relative to the base, wherein the lens holder can simultaneously The base moves axially along the optical axis; and

At least one magnetic control unit having a magnet disposed on the lens holder and an electromagnetic coil disposed on the base, the iron being magnetized by the electromagnetic coil substantially along a radial direction of the optical axis, The mirror holder is driven to rotate axially around the optical axis in the accommodating groove.

2. The magnetron zoom lens module as claimed in claim 1, wherein the receiving groove of the base substantially defines a cylindrical space, and the lens holder is substantially annular.

3. The magnetron zoom lens module according to claim 1, wherein the receiving groove of the base has at least one scallop extending radially along the optical axis, and the lens holder has at least one An ear portion extending into the scallop and provided for the magnet, the ear portion being axially rotatable about the optical axis in a space defined by the scallop.

The magnetron zoom lens module according to claim 3, wherein the base is provided with a winding groove provided around the electromagnetic coil at an outer side surface corresponding to the scallop.

The magnetron zoom lens module according to claim 1 , wherein the cam mechanism has at least one formed on the lens holder and axially rotated about the optical axis and obliquely facing a slanted surface extending from the pedestal, and at least one second inclined surface formed on the pedestal and axially rotating about the optical axis and obliquely extending toward the lens holder, The second inclined surface is disposed in cooperatively with each other, so that when the lens holder is rotated relative to the base, the mirror holder can simultaneously move relative to the base by the relative movement of the first and second inclined surfaces The optical axis moves axially.

The magnetron zoom lens module according to claim 5, wherein the inclined surfaces in contact with the first and second inclined surfaces are curved surfaces that match and have a non-linear change in slope.

The magnetron zoom lens module of claim 1 , wherein the lens module further comprises a cover that is cooperatively disposed on the base for the lens barrel to pass through.

8. The magnetron zoom lens module of claim 7, wherein the lens module further comprises an elastic member disposed between the cover and the lens holder.

9. The magnetron zoom lens module according to claim 8, wherein the elastic member is an elastic metal washer.

The magnetron zoom lens module according to claim 8, wherein the elastic member is a gasket made of an elastic rubber material such as rubber or silicone.