TWI449979B - Focus lens module - Google Patents

Description

Focus lens module

The present invention relates to the field of optical systems, and more particularly to a manual focus lens module.

With the rapid development of multimedia technology, digital cameras, camcorders and mobile phones with cameras are increasingly favored by consumers. At the same time, people put more demands on the image quality of digital cameras, camcorders and mobile phone cameras. Demand for products such as cameras, camcorders and mobile phones with cameras has also increased. In a camera such as a digital camera, a video camera, and a mobile phone camera, the lens module is an indispensable component.

The camera module usually includes a lens barrel, a lens holder, an optical component, and an image sensor. The optical component is received in the lens barrel, the image sensor is disposed on the lens holder, and the optical component and the image sensor are optically coupled by a cooperation between the lens barrel and the lens holder. As people's imaging quality requirements for camera modules are increasing, focusing functions have become one of the most common features of camera modules. The existing focus camera module utilizes a drive motor or a voice coil motor to drive the lens barrel or the lens holder to shift, thereby changing the distance between the lens barrel of the camera module and the lens holder to achieve focusing. However, the camera module is not only costly, but also Due to the existence of the drive motor or the voice coil motor, the entire lens module is large in size and complicated in structure, which cannot meet the demand for the lightness and thinness of the camera module.

In view of this, it is necessary to provide a focus lens module which is low in cost, simple in structure, and small in space.

A focusing lens module includes a lens holder, a lens barrel, a cover body and an elastic component. The mirror mount has a plurality of protrusions, each of which has a cam path surface. The lens barrel is received in the lens holder, and has a plurality of protrusions corresponding to the plurality of protrusions of the lens holder and an operation rod extending away from the lens holder along the axis of the lens barrel, and the plurality of protrusions are used for the plurality of protrusions Sliding along the cam path surface of the protrusion to cause displacement of the lens barrel along the axial direction of the lens holder relative to the lens holder, the operation rod is used for the operator to hold and move, thereby driving the lens barrel to rotate relative to the lens holder . The cover is fixed to one end of the lens holder housing barrel. The elastic element is disposed between the cover body and the lens barrel for providing elastic deformation and elastic recovery along the axial direction of the lens holder.

The focus lens module of the technical solution realizes the change of the relative position between the lens barrel and the lens holder by using the protrusion between the protrusion of the lens holder and the protrusion of the lens barrel. Since the protrusion has a cam path surface, the lens barrel is in focus. The process can slide smoothly relative to the lens holder. The elastic element prevents relative displacement of the lens barrel and the lens holder when it is out of focus. The focus lens module of the technical solution has the advantages of simple structure, small occupied space, suitable for miniaturization of the current lens module, and low cost, and is particularly suitable for electronic products such as mobile phones.

10‧‧‧focus lens module

11‧‧‧Mirror seat

12‧‧‧Mirror tube

13‧‧‧ Cover

14‧‧‧Flexible components

15‧‧‧Stainless glass

110‧‧‧ first body

111‧‧‧Second body

112‧‧‧First inner surface

113‧‧‧First outer surface

114‧‧‧First containment chamber

115‧‧‧First external thread

116‧‧‧First mating surface

117‧‧ ‧ prominence

118‧‧‧ cam path surface

119‧‧‧ bearing surface

120‧‧‧Inner cylinder

121‧‧‧Outer cylinder

1200‧‧‧Second external thread

1210‧‧‧First cylinder

1211‧‧‧Second cylinder

1212‧‧‧Second internal thread

1213‧‧‧ first end face

1214‧‧‧Operation lever

1215‧‧‧Second outer surface

1216‧‧‧second mating surface

1217‧‧‧second end face

1218‧‧‧Bumps

1219‧‧ plane

1220‧‧‧ protruding surface

130‧‧‧ side wall

131‧‧‧ bottom wall

132‧‧‧First internal thread

133‧‧‧through hole

140‧‧‧ frame

141‧‧‧Flexible arm

142‧‧‧Connected end

143‧‧‧Extension

150‧‧‧ Track

151‧‧‧First end

152‧‧‧ second end

FIG. 1 is an exploded view of a focus lens module according to an embodiment of the present technical solution.

2 is an exploded view of another perspective view of the focus lens module provided by the embodiment of the present technical solution.

FIG. 3 is an assembled view of a focus lens module provided by an embodiment of the present technical solution.

4 is a cross-sectional view of a focus lens module according to an embodiment of the present technical solution.

FIG. 5 is a cross-sectional view showing a focus state of a focus lens module according to an embodiment of the present technical solution. intention.

The technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 to FIG. 4 , which is a focusing lens module 10 according to an embodiment of the present disclosure, which includes a lens holder 11 , a lens barrel 12 , a cover 13 , an elastic member 14 , and a glass sheet 15 .

The lens holder 11 includes a first seat body 110 and a second seat body 111 that are connected to each other. The first base body 110 and the second base body 111 are both hollow cylindrical and coaxially disposed. The outer diameter of the second base body 111 is larger than the outer diameter of the first base body 110. The first base body 110 has a first inner surface 112 and a first outer surface 113. The first inner surface 112 encloses a first receiving cavity 114 for receiving the lens barrel 12. The first outer surface 113 has a first outer thread 115. The second base 111 can be used to receive an image sensor having a first mating surface 116 adjacent to the first base 110. The first mating surface 116 is perpendicular to the first inner surface 112. The first mating face 116 has at least two protrusions 117. The at least two protrusions 117 are adjacent to each other and have a gradual height in a direction parallel to the central axis of the lens holder 11. In this embodiment, the number of the protrusions 117 is three, and both are substantially arc-shaped strips. Each protrusion 117 has a cam path surface 118 and a bearing surface 119 that are connected. The cam path surface 118 is coupled to the first mating surface 116 that is parallel to the first mating surface 116. The three-stage cam path surface 118 is equiangularly distributed around the central axis of the lens holder 11, and the path lengths of the starting point to the end point of each of the cam path surfaces 118 are equal, the path surface bending amplitude is the same, and each of the cam path surfaces 118 is spaced from the The radial distances of the central axes of the mirror base 11 are all equal. The path of each segment of the cam path surface 118 has an inclination relative to the first mating surface 116, that is, at each position from the start point to the end point of each segment of the cam path surface 118. The height of the first mating surface 116 is different. In the present embodiment, the three-stage cam path surface 118 is inclined upward in the same direction, and as seen from Fig. 1, it is inclined upward in the counterclockwise direction. The slope of the path of each of the three cam path faces 118 relative to the first mating face 116 may be set according to accuracy requirements. In this embodiment, the three-stage cam path surfaces 118 are equally spaced on the first mating surface 116.

The lens barrel 12 is received in the lens holder 11 and includes an inner cylinder 120 and an outer cylinder 121 fixed together. The inner cylinder 120 is for receiving an optical component such as a lens or a spacer ring, and has a second external thread 1200. The outer cylinder 121 is sleeved outside the inner cylinder 120 and includes a first cylinder 1210 and a second cylinder 1211 connected thereto. The first cylinder 1210 has a hollow cylindrical shape, which is located away from one side of the lens holder 11 and has a second internal thread 1212 matched with the second external thread 1200, and the inner cylinder 120 is second The engagement between the thread 1200 and the second internal thread 1212 is thereby fixed to the first cylinder 1210 of the outer cylinder 121. The first cylinder 1210 has a first end surface 1213 which is located on the side of the lens barrel 12 farthest from the lens holder 11 and parallel to the first mating surface 116. The first cylinder 1210 extends perpendicularly from the first end surface 1213 along the axial direction of the lens barrel 12 to the columnar operating rod 1214. The operating lever 1214 is for the operator to hold and move, so that the lens barrel 12 can be rotated relative to the lens holder 11.

The second cylinder 1211 is also hollow cylindrical, and is disposed coaxially with the first cylinder 1210 and has a diameter larger than the diameter of the first cylinder 1210. The second cylinder 1211 is received in the first receiving cavity 114 of the first base 110 and has a second outer surface 1215 , a second mating surface 1216 and a second end surface 1217 . The second end surface 1217 is parallel to the first end surface 1213. The second mating face 1216 is parallel to the second end face 1217 and is parallel to the first mating face 116. The second outer surface 1215 is connected between the second mating surface 1216 and the second end surface 1217 for the first inner surface 112 of the first base 110 of the lens holder 11 contact. The second cylinder 1211 extends at least two protrusions 1218 perpendicularly from the second mating surface 1216 in the axial direction of the lens barrel 12 toward the lens holder 11 . The number and position of the at least two bumps 1218 correspond to at least two protrusions 117 of the lens holder 11 which are slidable along the cam path surface 118 of the protrusion 117 such that the lens barrel 12 is edged relative to the lens holder 11. The mirror base 11 is axially displaced. Each of the bumps 1218 has a connecting plane 1219 and a protruding surface 1220. The plane 1219 is parallel to the second mating face 1216. The convex surface 1220 is a curved surface that protrudes toward the first mating surface 116 and is located at the cam path surface 118 of the bump 1218 near the protrusion 117. In this embodiment, the bumps 1218 are also substantially arcuate strips, and the convex surfaces 1220 are hemispherical surfaces. Of course, the bumps 1218 may also be hemispherical or other irregular shapes, and only need to have a convex surface 1220 protruding toward the first mating surface 116.

Of course, the inner cylinder 120 and the outer cylinder 121 may be integrally formed, or the inner cylinder 120 may be omitted, and the optical component may be directly received in the outer cylinder 121.

The cover 13 is fixed to the lens holder 11 and includes a connecting side wall 130 and a bottom wall 131. The side wall 130 has a first internal thread 132 matched with the first external thread 115 of the lens holder 11 , and the cover 13 is fixed to the lens holder by the cooperation of the first internal thread 132 and the first external thread 115 . The first body 110 of 11. The bottom wall 131 is opposite to the second end surface 1217 of the second cylinder 1211 of the lens barrel 12, and has a through hole 133 for the first cylinder 1210 of the outer cylinder 121 of the lens barrel 12 to pass through. Therefore, the operating rod 1214 of the first cylinder 1210 can also pass through the through hole 133 and move in the through hole 133.

The elastic member 14 is located between the cover 13 and the lens barrel 12 for providing elastic deformation and elastic recovery along the axial direction of the lens holder 11. In this embodiment, the elastic member 14 is a spring piece, which is substantially annular, and includes a circular frame body 140 and at least two elastic arms 141 connected to the frame body 140. The number of the elastic arms 141 is three And angularly distributed around the central axis of the elastic member 14. Each of the elastic arms 141 has a connecting end 142 and an extending end 143 . The connecting end 142 is connected to the frame 140 . The extending end 143 extends from the frame 140 along the axis of the lens holder 11 away from the frame 140 . When the elastic member 14 is in a natural state, each of the elastic arms 141 is at an angle to the plane of the frame 140. The frame 140 of the elastic member 14 is sleeved outside the first cylinder 1210 and bears against the second end surface 1217 of the second cylinder 1211. The extended end 143 of the elastic arm 141 abuts the cover 13 . When the elastic member 14 is compressed, the elastic arm 141 is deformed, and the angle between the elastic member 141 and the plane of the frame 140 is reduced. When the pressure is removed, the angle between the elastic arm 141 and the plane of the frame 140 is restored. The original angle. Of course, the resilient element 14 can also be a spring, an elastomeric pad or other alternative.

The glass sheet 15 is oppositely disposed on one side of the lens barrel 12 away from the lens holder 11 and has a rail 150. The rail 150 is an arcuate through hole formed in the glass sheet 15 for the operating rod 1214 to pass through and limit the angle θ of the operating rod 1214 relative to the central axis of the lens holder 11. The track 150 has opposing first and second ends 151, 152. When the operating lever 1214 is located at the first end 151 of the track 150, the tab 1218 is located at the first mating face 116 and the resilient member 14 is in a natural state. In this embodiment, the center angle θ of the track 150 corresponding to the central axis of the lens holder 11 is 30°. The glass sheet 15 can be bonded to the casing of the camera module by bonding or the like.

Referring to FIG. 1 , FIG. 4 and FIG. 5 , when the operating rod 1214 of the focusing lens module 10 is located at the first end 151 of the rail 150 , the protrusion 1218 is located at the first mating surface 116 . When focusing is performed, the operating lever 1214 can be moved along the rail 150 to the second end portion 152, and the convex surface 1220 of the projection 1218 of the lens barrel 12 interacts with the cam path surface 118 of the projection 117, so that the projection 1218 is along the projection 117. Cam path face 118 rises and compresses the elastic element The elastic arm 141 is deformed until the convex surface 1220 of the bump 1218 reaches and is carried on the bearing surface 119. At this time, the angle between the elastic arm 141 and the plane of the frame 140 is also reduced, and the lens barrel 12 is The relative distance between the lens holders 11 along the axial direction of the lens holder 11 is increased, and the distance between the image sensor and the lens respectively received in the lens holder 11 and the lens barrel 12 is also increased to achieve focusing.

It can be understood that if the protrusions 117 are arranged in a stepped structure and the plurality of cam path faces are disposed correspondingly, the multi-stage focusing of the focus lens module 10 can also be achieved.

The focus lens module 10 of the present technical solution realizes the change of the relative position between the lens barrel 12 and the lens holder 11 by the interaction between the protrusion 117 of the lens holder 11 and the bump 1218 of the lens barrel 12, since the protrusion 117 has a cam. The path surface 118 allows the lens barrel 12 to smoothly slide relative to the lens holder 11 during focusing. The elastic member 14 prevents relative displacement of the lens barrel 12 and the lens holder 11 when it is out of focus. The focus lens module 10 of the present technical solution has the advantages of simple structure, small occupied space, suitable for miniaturization of the current lens module, and low cost, and is particularly suitable for use in electronic products such as mobile phones.

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.

10‧‧‧focus lens module

11‧‧‧Mirror seat

12‧‧‧Mirror tube

13‧‧‧ Cover

14‧‧‧Flexible components

15‧‧‧Stainless glass

110‧‧‧ first body

111‧‧‧Second body

112‧‧‧First inner surface

113‧‧‧First outer surface

114‧‧‧First containment chamber

115‧‧‧First external thread

116‧‧‧First mating surface

117‧‧ ‧ prominence

118‧‧‧ cam path surface

119‧‧‧ bearing surface

120‧‧‧Inner cylinder

121‧‧‧Outer cylinder

1200‧‧‧Second external thread

1210‧‧‧First cylinder

1211‧‧‧Second cylinder

1212‧‧‧Second internal thread

1213‧‧‧ first end face

1214‧‧‧Operation lever

1215‧‧‧Second outer surface

1216‧‧‧second mating surface

1217‧‧‧second end face

1218‧‧‧Bumps

1219‧‧ plane

1220‧‧‧ protruding surface

130‧‧‧ side wall

131‧‧‧ bottom wall

133‧‧‧through hole

140‧‧‧ frame

141‧‧‧Flexible arm

142‧‧‧Connected end

143‧‧‧Extension

150‧‧‧ Track

151‧‧‧First end

152‧‧‧ second end

Claims (9)

A focusing lens module includes: a lens holder having a plurality of protrusions each having a cam path surface; a lens barrel received in the lens holder and having a plurality of protrusions corresponding to the plurality of protrusions of the lens holder a block and an operating rod extending along an axis of the lens barrel away from the lens holder, the plurality of bumps for sliding along a cam path surface of the plurality of protrusions to cause a lens barrel to occur along the lens holder axis with respect to the lens holder Displaceing, the operating rod is for the operator to hold and move, thereby driving the lens barrel to rotate relative to the lens holder; the cover body is fixed to one end of the lens holder housing barrel; and the elastic element is disposed Between the cover body and the lens barrel, for providing elastic deformation and elastic recovery along the axial direction of the lens holder. The focus lens module of claim 1, wherein the plurality of cam path faces are equiangularly distributed around a central axis of the mirror mount. The focus lens module of claim 1, wherein the plurality of protrusions are adjacent to each other, and the plurality of protrusions have a gradual height in a direction parallel to a central axis of the mirror holder. The focusing lens module of claim 1, wherein the cover body is provided with a through hole for the lens barrel to pass through and the operating rod to move therein. The focus lens module of claim 4, further comprising a glass piece disposed on a side of the lens barrel away from the lens holder, the glass piece having a curved through hole for the operating rod Move within it. The focus lens module of claim 1, wherein the elastic element comprises a frame body and a plurality of elastic arms connected to the frame body, wherein the plurality of elastic arms are equiangularly distributed around the axis of the lens holder, and each A resilient arm extends from the frame along the axis of the mirror base away from the frame. The focus lens module of claim 6, wherein the frame body is fixed to the lens barrel, and each of the elastic arms abuts against the cover body away from one end of the frame body. The focus lens module of claim 1, wherein the mirror base comprises a first base body and a second base body, the first base body having a first space for receiving the lens barrel The plurality of protrusions are disposed in the second seat and are located in the first receiving cavity. The focus lens module of claim 8, wherein the cover body is screwed to the first base body.