TWI400557B - Lens module - Google Patents

Description

Lens module

The invention relates to a lens module, in particular to a lens module built in a driving device.

When the 35mm photographic device with autofocus appeared in 1985, it provided a way to get clear photos quickly. (See "Revolution of Autofocus", Science and Technology News, SCIENTIFIC & TECHNICAL TRENDS ABROAD, 1997, 08) Today, lens modules with autofocus function are widely used in the field of imaging to adjust the lens of the imaging lens. The distance and image distance, especially in digital camera devices, are more widely used. The lens module generally includes a lens barrel for accommodating the lens group, a fixing seat for accommodating the lens, and a driving device for driving the movement of the lens barrel.

In a lens module with an autofocus function, a conventional driving device such as a stepping motor is generally disposed outside the fixing base, and a transmission component connection is required to indirectly drive the lens barrel to move along its axial direction. Moreover, since the driving device and the transmission component thereof are generally located on one side of the lens barrel, the lens module is asymmetric in structure when actually assembled, and the force of the lens barrel is unevenly distributed during use, thereby driving the lens barrel along the same It is easy to yaw when moving axially.

In view of this, it is necessary to provide a lens module with a built-in driving device and a symmetrical structure.

A lens module includes a fixing base, a driving device and a lens barrel received in the fixing seat. The driving device is used to drive the lens barrel along the same Axial movement. The drive device includes a toroidal coil stator and a rotor having at least one magnetic ring. The outer wall of the barrel has an external thread. The driving device is disposed between the lens barrel and the fixing base. The annular coil stator is fixed to the inner wall of the fixing base, and has a receiving space. The rotor is accommodated in the receiving space. The drive device still further includes a retaining ring extending from the inner annular surface of the toroidal coil stator. The rotor is slidably coupled to the inner annulus of the retaining ring, and the inner wall of the rotor further has an internal thread that engages the external thread.

Compared with the prior art, the driving device in the lens module of the present invention is disposed on the inner wall of the fixing base of the lens module, and can drive the lens barrel to move along the axial direction without an additional transmission component. Moreover, the force of the lens barrel is uniform in all directions, so that it is less prone to yaw when moving in the axial direction.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , a lens module 100 according to an embodiment of the invention includes a lens barrel 10 , a fixing base 20 and a driving device 30 . The lens barrel 10 is received in the fixing base 20 , and the driving device 30 is received between the lens barrel 10 and the fixing base 20 . The lens barrel 10 is movably coupled to the driving device 30. The driving device 30 is used to drive the lens barrel 10 to move axially.

The lens barrel 10 is a hollow cylinder. The outer wall of one end of the lens barrel 10 is provided with an external thread 11 , and the other end of the lens barrel 10 is recessed with at least one limiting chute 12 . The lens barrel 10 is provided with one end of the limiting chute 12, and further includes a light-passing hole 13 for external light entering the lens module 100 along the axial direction of the lens barrel 10. In the present embodiment, the number of the limit chutes 12 is three, evenly distributed on the outer wall of the lens barrel 10.

The holder 20 is used to fix the lens barrel 10. The fixing base 20 includes a The body 21 and an upper cover 22. The upper cover 22 extends at least one flange 221 corresponding to the limiting sliding slot 12, and the number of the flanges 221 is less than or equal to the number of the limiting sliding slots 12. In the present embodiment, the number of the flanges 221 is equal to the number of the limit chutes 12, and is also three. The flange 221 is received in the limiting slot 12 of the lens barrel 10 to limit the rotation of the lens barrel 10.

The driving device 30 includes a toroidal coil stator 31, a fixing ring 32 and a rotor 33.

The toroidal coil stator 31 is fixed to the inner wall of the fixing base 20, and has a receiving space 311, and the inner annular surface has a plurality of pole teeth.

The retaining ring 32 extends from the inner annular surface of the toroidal coil stator 31. In the present embodiment, the fixing ring 32 is located at a middle position of the inner annular surface of the toroidal coil stator 31.

The rotor 33 is received in the receiving space 311 of the toroidal coil stator 31, and includes a rotating ring 331 slidably coupled to the inner wall of the fixing ring 32 and two opposite end faces fixed to the rotating ring 331. The magnetic ring 332 has the same structure and is symmetrically disposed with respect to the fixed ring 32. The inner wall of the rotating ring 331 has an internal thread 3311 that meshes with the external thread 11. The end of the magnetic ring 332 adjacent to the rotating ring 331 further abuts against the two end faces of the fixing ring 32. Thereby the axial movement of the rotating ring 331 is restricted.

In operation, the toroidal coil stator 31 in the lens module 100 generates magnetism, and the magnetic ring 332 in the rotor 33 is rotated by the toroidal coil stator 31 to rotate around the optical axis of the lens group, thereby driving the rotor 33 and rotating The ring 331 rotates. It will be appreciated that the rotor 33 now forms a sliding bearing with the retaining ring 32 which rotates relative to the retaining ring 32. The rotating ring 331 is fixed The fixed seat 20 limits the rotational movement of the lens barrel 10 to be screwed, so that the lens barrel 10 can be moved axially, thereby achieving focusing of the lens module 100.

Compared with the prior art, the driving device in the lens module of the present invention is disposed on the inner wall of the fixing base of the lens module, and can drive the lens barrel to move along the axial direction without an additional transmission component. Moreover, the force of the lens barrel is uniform in all directions, so that it is less prone to yaw when moving in the axial direction.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Lens module ‧‧100

Mirror ‧‧10

Fixed seat ‧ ‧ 20

Drive ‧‧30

External thread ‧‧11

Limit chute ‧‧12

Light hole ‧‧13

Ontology ‧‧21

Cover ‧‧22

Flange ‧ ‧ 221

Ring coil stator ‧‧31

Fixed ring ‧‧32

Rotor ‧‧33

Capacity ‧‧‧311

Rotating ring ‧ ‧ 331

Magnetic ring ‧ ‧ 332

Internal thread ‧‧3833

FIG. 1 is a perspective view of a lens module provided by the present invention.

FIG. 2 is a perspective exploded view of FIG. 1. FIG.

Figure 3 is a cross-sectional view taken along the line III-III of Figure 1 .

Lens module ‧‧100

Mirror ‧‧10

Fixed seat ‧ ‧ 20

Drive ‧‧30

External thread ‧‧11

Limit chute ‧‧12

Light hole ‧‧13

Ontology ‧‧21

Cover ‧‧22

Flange ‧ ‧ 221

Ring coil stator ‧‧31

Fixed ring ‧‧32

Rotor ‧‧33

Rotating ring ‧ ‧ 331

Magnetic ring ‧ ‧ 332

Internal thread ‧‧3833

Claims (7)

A lens module includes a fixing base, a driving device and a lens barrel received in the fixing seat, wherein the driving device is configured to drive the lens barrel to move along the axial direction thereof, and the driving device comprises a loop coil stator And at least one magnetic ring rotor, the improvement is that the outer wall of the lens barrel has an external thread, the driving device is received between the lens barrel and the fixing seat, and the annular coil stator is fixed on the inner wall of the fixing seat, The driving device further includes a fixing ring extending from the inner annular surface of the toroidal coil stator, and the rotor is slidably connected with the inner annular surface of the fixing ring. The inner wall of the rotor also has an internal thread that meshes with the external thread. The lens module of claim 1, wherein the rotor comprises a rotating ring slidably coupled to the inner annular surface of the retaining ring and two symmetrical arms respectively fixed to the two end faces of the rotating ring A magnetic ring having an inner wall with an internal thread that meshes with the external thread. The lens module of claim 1, wherein the lens barrel is a hollow cylinder, the outer wall of one end of the barrel is provided with an external thread, and the other end of the barrel is recessed At least one limit chute. The lens module of claim 3, wherein the fixing base protrudes from at least one flange corresponding to the limiting sliding slot, the flange is received in the limiting slot of the lens barrel and the The number of flanges is less than or equal to the number of the limit chutes. The lens module of claim 4, wherein the number of the flanges is equal to the number of the limit chutes. The lens module of claim 1, wherein the fixing The ring is located in the middle of the inner annular surface of the toroidal coil stator. The lens module of claim 2, wherein the two magnetic rings abut the end faces of the rotating ring and abut against the two end faces of the fixing ring.