Patent Publication Number: US-2019179100-A1

Title: Camera lens

Description:
FIELD OF THE PRESENT DISCLOSURE 
     The present disclosure relates to a lens module for capturing image, and more particularly to a lens module having a configuration enabling high efficient assembly. 
     DESCRIPTION OF RELATED ART 
     With development of technology, besides digital cameras, more and more portable electronic devices are equipped with image capturing functions. To achieve the image capturing function, a camera module is needed. Generally, a camera module includes a camera lens for collecting light reflected from an object, a sensor for receiving the light and converting the light to electrical signals, and processor for calculating the signals and outputting digital images. 
     Such a camera lens includes a lens holder, a plurality of lens units positioned in the lens holder, a plurality of shading plates located between two adjacent lens units, and a pressing ring located between a last lens unit and the lens holder for positioning the lens units. Typically, the pressing ring is attached to the lens holder by adhering. In the related camera lens, however, the lens holder is made from a single kind of material, and the aperture for letting light enter the camera lens is fixed, which makes it difficult or inflexible to assemble the lens units. 
     Therefore, it is desired that an improved camera lens can be developed to overcome the disadvantages mentioned above. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the exemplary embodiments can be better understood with reference to the following drawings. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. 
         FIG. 1  is an illustrative cross-sectional view of a camera lens in accordance with a first exemplary embodiment of the present invention. 
         FIG. 2  is an exploded view of the camera lens in  FIG. 1 . 
         FIG. 3  is an illustrative cross-sectional view of a camera lens in accordance with a second exemplary embodiment of the present invention. 
         FIG. 4  is an exploded view of the camera lens in  FIG. 3 . 
         FIG. 5  is an illustrative cross-sectional view of a camera lens in accordance with a third exemplary embodiment of the present invention. 
         FIG. 6  is an exploded view of the camera lens in  FIG. 5 . 
         FIG. 7  is an illustrative cross-sectional view of a camera lens in accordance with a fourth exemplary embodiment of the present invention. 
         FIG. 8  is an illustrative cross-sectional view of a camera lens in accordance with a fifth exemplary embodiment of the present invention, showing a first form of an engagement of a first holder and a second holder. 
         FIG. 9  is an exploded view of the camera lens in  FIG. 8 . 
         FIG. 10  is an illustrative cross-sectional view of the camera lens in accordance with the fifth exemplary embodiment, showing a second form of the engagement of the first holder and the second holder. 
         FIG. 11  is an illustrative cross-sectional view of the camera lens in accordance with the fifth exemplary embodiment, showing a third form of the engagement of the first holder and the second holder. 
         FIG. 12  is an illustrative cross-sectional view of the camera lens in accordance with the fifth exemplary embodiment, showing a fourth form of the engagement of the first holder and the second holder. 
         FIG. 13  is an illustrative cross-sectional view of a camera lens in accordance with a sixth exemplary embodiment of the present invention, showing a first form of an engagement of a first holder and a second holder. 
         FIG. 14  is an illustrative cross-sectional view of the camera lens in accordance with the sixth exemplary embodiment, showing a second form of the engagement of the first holder and the second holder. 
         FIG. 15  is an illustrative cross-sectional view of the camera lens in accordance with the sixth exemplary embodiment, showing a third form of the engagement of the first holder and the second holder. 
         FIG. 16  is an illustrative cross-sectional view of the camera lens in accordance with the sixth exemplary embodiment, showing a fourth form of the engagement of the first holder and the second holder. 
         FIG. 17  is an illustrative cross-sectional view of a camera lens in accordance with a seventh exemplary embodiment of the present invention, showing a first form of an engagement of a first holder and a second holder. 
         FIG. 18  is an exploded view of the camera lens in  FIG. 17 . 
         FIG. 19  is an illustrative cross-sectional view of the camera lens in accordance with the seventh exemplary embodiment, showing a second form of the engagement of the first holder and the second holder. 
         FIG. 20  is an illustrative cross-sectional view of the camera lens in accordance with the seventh exemplary embodiment, showing a third form of the engagement of the first holder and the second holder. 
         FIG. 21  is an illustrative cross-sectional view of the camera lens in accordance with the seventh exemplary embodiment, showing a fourth form of the engagement of the first holder and the second holder. 
         FIG. 22  is an illustrative cross-sectional view of a camera lens in accordance with an eighth exemplary embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS 
     The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby are only to explain the disclosure, not intended to limit the disclosure. 
     A camera lens in accordance with an embodiment of the present invention includes a lens holder and a lens group accommodated in the lens holder. The lens group includes a first lens unit. The lens holder includes a first holder and a second holder covering the first lens holder and having a light aperture. The first and second holders form an accommodation space for receiving the first lens unit therein. The first lens unit includes an object side surface adjacent to the light aperture, and the first holder or the second holder abuts against the object side surface of the first lens unit. The first holder includes a first complementary configuration, and the second holder includes a second complementary configuration for engaging with the first complementary configuration. The first complementary configuration is engaged with the second complementary configuration by buckles or by screws/threads. In case of buckles, the first complementary configuration serves as a first buckle, and the second complementary configuration serves as a second buckle. In case of threads, the first complementary configuration serves as a first thread portion, and the second complementary configuration serves as a second thread portion. In the first, second, third, and four embodiments, the second holder abuts against the object side surface of the first lens unit; in the fifth, sixth, seventh, and eighth embodiments, the first holder abuts against the object side surface of the first lens unit. 
     First Embodiment 
     Referring to  FIGS. 1-2 , a camera lens  1100  includes a lens holder  11  and a lens group  12  accommodated in the lens holder  11 . 
     The lens holder  11  includes a first holder  111  and a second holder  112  covering and engaging with the first holder  111 . The second holder  112  forms a light aperture  114  penetrating therethrough. The first holder  111  and the second holder  112  cooperatively form an accommodation space  113 . The lens group  12  accommodates in the accommodation space  113 . The lens group  12  includes an object side surface adjacent to the light aperture  114 , and the second holder  112  abuts against the object side surface of the lens group  12 . The first holder  111  includes a first complementary configuration  11141 , and the second holder  112  includes a second complementary configuration  11221  for engaging with the first complementary configuration  11141 . Thereby, the lens holder  11  is configured to be a two-piece structure, which makes it convenient and high efficient to assemble the camera lens. 
     In the embodiment, the first complementary configuration  11141  is a ring-shaped slot, and the second complementary configuration  11221  is a protrusion engaging with the ring-shaped slot; or, the first complementary configuration  11141  is a protrusion, and the second complementary configuration  11221  is a ring-shaped slot engaging with the protrusion. 
     The lens group  12  is located in the accommodation space  113 . The lens group  12  is configured to be concentric with the light aperture  114 . In the embodiment, the lens group  12  includes at least a first lens unit  121  adjacent to the second holder  112 . 
     The first holder  111  includes a bottom surface  1111 , a top surface  1112  opposite to the bottom surface  1111 , and a side surface  1113  connecting the bottom surface  1111  and the top surface  1112 . Further, from the top surface  1112  toward the bottom surface  1111 , a recess  1114  (referring to  FIG. 2 ) is formed and a first buckle  11141  is formed in the recess  1114 . 
     The second holder  112  includes a main side  1121  and an auxiliary side  1122  extending perpendicularly from the main side  1121 . The light aperture  114  is formed in the main side  1121 . The auxiliary side  1122  includes a second buckle  11221  engaging with the first buckle  11141 . The second holder  112  covers the top surface  1112  of the first holder  111  and positions the auxiliary side  1122  in the recess  1114  by virtue of the engagement of the first buckle  11141  and the second buckle  11221 , which assembles the first holder  111  with the second holder  112 . By the two-piece structure, the first and second holders  111 ,  112  can made from different materials. For example, the second holder  112  can be made from materials with high light absorptivity for reducing stray light and further for improving optical performance. 
     In the embodiment, the first buckle  11141  is ring-shaped, and the accordingly, the second buckle  11221  is also ring-shaped. A cross-sectional view of the first buckle or the second buckle is substantially semicircle, trapezoid, or rectangular. The recess  1114  is formed by a first wall  11142  connecting with the top surface  1112 , a second wall  11143  extending from the first wall perpendicularly. The second wall  11143  connects with the side surface  1113 . In  FIG. 2 , the first wall  11142  is a vertical wall, and the second wall  11143  is a horizontal wall. 
     The first buckle  11141  is formed on the first wall  11142 , and the second buckle  11221  is formed on a side of the second holder adjacent to the first wall  11142 . A direction of the engagement between the first buckle and second buckle is parallel to the second wall  11143 . The auxiliary wall  1122  can keep a distance from the second wall  11143 , or abut against the second wall  11143 . 
     The first lens unit  121  includes an object side surface  1211  adjacent to the light aperture  114  and an image side surface  1212  opposite to the object side surface  1211 . The first lens unit  121  is positioned by the first holder  111  and the object side surface of the first lens unit  121  is nearer the main wall  1121  of the second holder than the top surface  1112  of the first holder  111 . The main wall  1121  abuts against the object side surface  1211  of the first lens unit  121 , and keeps a distance from the top surface  1112  of the first holder  111 . By virtue of such a configuration, the first holder  111  can be easier removed from or assembled with the second holder  112 . And, because the second holder  112  can be removed from the first holder  111 , the second holder can be replaced by another second holder  112  with a bigger light aperture, according to different requirements. In addition, the main wall  1121  abuts against the object side surface  1211  of the first lens unit  121  for serving as a pressing ring for positioning the first lens unit  121  on the first holder  111 . 
     The camera lens  1100  further includes a pressing ring  115  located on the image side surface of the first lens unit. 
     Second Embodiment 
     Referring to  FIGS. 3-4 , the first holder  111 ′ of the lens holder  11 ′ includes a bottom surface  1111 ′, a top surface  1112 ′ opposite to the bottom surface  1111 ′, and a side surface  1113 ′ adjacent to the accommodation space for connecting the top surface  1112 ′ to the bottom surface  1112 ′. The first buckle  11141 ′ is formed on the side surface  1113 ′ near the accommodation space. 
     The second holder  112 ′ includes a main wall  1121 ′ with a light aperture  114 ′ and an auxiliary wall  1122 ′ extending perpendicularly from the main wall  1121 ′. The main wall  1121 ′ covers the top surface  1111 ′ of the first holder  111 ′. The auxiliary wall  1122 ′ abuts against the side surface  1113 ′ adjacent to the accommodation space, and the second buckle  11221 ′ is formed on the auxiliary wall  1122 ′. Therefore, the second embodiment discloses another form of the configuration of the first buckle and the second buckle. Other configurations not mentioned in this embodiment are similar to what have been disclosed in the first embodiment. 
     Third Embodiment 
     Referring to  FIGS. 5-6 , a camera lens  2100  includes a lens holder  21  and a lens group  22  positioned in the lens holder  21 . The lens holder  21  includes a first holder  211  and a second holder  212  covering the first holder  21  for forming an accommodation space  213 . The second holder  212  is formed with a light aperture  214 . The lens group  22  is received in the accommodation space  213  and includes an object side surface adjacent to the light aperture  214 . The second holder  212  abuts against the object side surface of the lens group  22 . The first holder  211  includes a first thread portion  21141 , and correspondingly the second holder  212  includes a second thread portion  21221  engaging with the first thread portion  21141 . By the two-piece structure, the first and second holders  211 ,  212  can made from different materials. For example, the second holder  1212  can be made from materials with high light absorptivity for reducing stray light and further for improving optical performance. 
     The lens group  22  is received in the accommodation space, and is concentric with the light aperture. In this embodiment, the lens group  22  includes a first lens unit  221  adjacent to the light aperture of the second holder  212  and a second lens unit  222  stacked on the first lens unit  221 . 
     The first holder  211  includes a bottom surface  2111 , a top surface  2112  opposite to the bottom surface  2111 , and a side surface  2113  connecting the top surface  2112  to the bottom surface  2111 . A recess  2114  is formed by recessing from the top surface  2111  toward the bottom surface  2112 . The first thread portion  21141  is formed on the side surface  2113  in the recess  2114 . In the embodiment, the first thread portion  21141  is provided with an external thread. 
     The second holder  212  includes a main wall  2121  and an auxiliary wall  2122  extending perpendicularly from the main wall  2121 . A light aperture  214  is formed in the main wall  2121 . The auxiliary wall  2122  is provided with a second thread portion  21221  having an internal thread. The second holder  212  covers the top surface  2112  of the first holder  211  and the auxiliary wall  2122  is at least partially received in the recess  2114 . The first thread portion and the second thread portion  21141 ,  21221  engage with each other for assembling the first holder  211  with the second holder  212 . 
     Specifically, the recess  2114  is formed by a first wall  21142  connecting the top surface  21142 , and a second wall  21143  connecting the side surface  2113 . As shown in  FIG. 5 , the first wall  21142  is a parallel wall and the second wall  21143  is a horizontal wall. The first thread portion  21141  is formed on the first wall  21142 , and the second thread portion  21221  is formed on a side of the second holder adjacent to the first wall  21142 . A direction of the engagement between the first thread and second thread is parallel to the second wall  21143 . The auxiliary wall  2122  can keep a distance from the second wall  21143 , or abut against the second wall  21143 . 
     The first lens unit  221  includes an object side surface  2211  adjacent to the light aperture  214  and an image side surface  2212  opposite to the object side surface  2211 . The first lens unit  221  is positioned by the first holder  211  and the object side surface of the first lens unit  221  is nearer the main wall  2121  of the second holder than the top surface  2112  of the first holder  211 . The main wall  2121  abuts against the object side surface  2211  of the first lens unit  221 , and keeps a distance from the top surface  2112  of the first holder  211 . By virtue of such a configuration, the first holder  211  can be easier removed from or assembled with the second holder  212 . And, because the second holder  212  can be removed from the first holder  211 , the second holder can be replaced by another second holder  212  with a bigger light aperture, according to different requirements. In addition, the main wall  2121  abuts against the object side surface  2211  of the first lens unit  221  for serving as a pressing ring for positioning the first lens unit  221  on the first holder  211 . The camera lens  2100  further includes a pressing ring  215  located on the image side surface of the first lens unit. 
     Fourth Embodiment 
     Referring to  FIG. 7 , the first holder  11 ′ of the lens holder  1 ′ includes a bottom surface  111 ′, a top surface  112 ′ opposite to the bottom surface  111 ′, and a side surface  113 ′ adjacent to the accommodation space for connecting the top surface  112 ′ to the bottom surface  112 ′. The first thread portion  1141 ′ is formed on the side surface  113 ′ near the accommodation space. The first thread portion  1141 ′ here is provided with an internal thread. 
     The second holder  12 ′ includes a main wall  121 ′ with a light aperture  14 ′ and an auxiliary wall  122 ′ extending perpendicularly from the main wall  121 ′. The main wall  121 ′ covers the top surface  111 ′ of the first holder  11 ′. The auxiliary wall  122 ′ abuts against the side surface  113 ′ adjacent to the accommodation space, and the second thread portion  1221 ′ is formed on the auxiliary wall  122 ′. The second thread portion  1221 ′ here is provided with an external thread. Therefore, the second embodiment discloses another form of the configuration of the first thread portion and the second thread portion. Other configurations not mentioned in this embodiment are similar to what have been disclosed in the first embodiment. 
     Fifth Embodiment 
     Referring to  FIGS. 8-9 , a camera lens  3100  includes a lens holder  31  and a lens group  32  accommodated in the lens holder  31 . 
     The lens holder  31  includes a first holder  311  and a second holder  312  covering and engaging with the first holder  311 . The second holder  312  forms a light aperture  314  penetrating therethrough. The first holder  311  and the second holder  312  cooperatively form an accommodation space  313 . The lens group  32  accommodates in the accommodation space  313 . The lens group  32  includes an object side surface adjacent to the light aperture  314 , and the first holder  311  abuts against the object side surface of the lens group  32 . The first holder  311  includes a first complementary configuration  31141 , and the second holder  312  includes a second complementary configuration  31221  for engaging with the first complementary configuration  31141 . Thereby, the lens holder  31  is configured to be a two-piece structure, which makes it convenient and high efficient to assemble the camera lens. 
     In the embodiment, the first complementary configuration  31141  is a ring-shaped slot, and the second complementary configuration  31221  is a protrusion engaging with the ring-shaped slot; or, the first complementary configuration  31141  is a protrusion, and the second complementary configuration  31221  is a ring-shaped slot engaging with the protrusion. 
     The lens group  32  is located in the accommodation space  313 . The lens group  32  is configured to be concentric with the light aperture  314 . In the embodiment, the lens group  32  includes at least a first lens unit  321  adjacent to the second holder  312 . 
     The first holder  311  includes a bottom surface  3111 , a top surface  3112  opposite to the bottom surface  3111 , and a side surface  3113  connecting the bottom surface  3111  and the top surface  3112 . Further, from the top surface  3112  toward the bottom surface  3111 , a recess  3114  (referring to  FIG. 9 ) is formed and a first buckle  31141  is formed in the recess  3114 . The first holder  311  further includes a pressing wall  3115  extending from the top surface  3112  toward a central axis of the first holder  311 . The pressing wall  3115  abuts against the first lens unit  321 . 
     The second holder  312  includes a main side  3121  and an auxiliary side  3122  extending perpendicularly from the main side  3121 . The light aperture  314  is formed in the main side  3121 . The auxiliary side  1122  includes a second buckle  31221  engaging with the first buckle  31141 . The second holder  312  covers the top surface  3112  of the first holder  311  and positions the auxiliary side  3122  in the recess  3114  by virtue of the engagement of the first buckle  31141  and the second buckle  31221 , which assembles the first holder  111  with the second holder  112 . By the two-piece structure, the first and second holders  111 ,  112  can made from different materials. For example, the second holder  112  can be made from materials with high light absorptivity for reducing stray light and further for improving optical performance. 
     In the camera lens  3100 , the lens unit  32  includes a first lens unit  321 , a second lens unit  322 , a third lens unit  323 , a fourth lens unit  324 , a fifth lens unit  325 , and a sixth lens unit  326 . The pressing wall  3115  presses on the first lens unit for serving as a pressing ring to position the lens group. 
     In the embodiment, the first buckle  31141  is ring-shaped, and the accordingly, the second buckle  31221  is also ring-shaped. A cross-sectional view of the first buckle or the second buckle is substantially semicircle, trapezoid, or rectangular. The recess  3114  is formed by a first wall  31142  connecting with the top surface  3112 , a second wall  31143  extending from the first wall perpendicularly. The second wall  31143  connects with the side surface  3113 . In  FIG. 9 , the first wall  31142  is a vertical wall, and the second wall  31143  is a horizontal wall. 
     The first buckle  31141  is formed on the first wall  31142 , and the second buckle  31221  is formed on a side of the second holder adjacent to the first wall  31142 . A direction of the engagement between the first buckle and second buckle is parallel to the second wall  31143 . The auxiliary wall  3122  can keep a distance from the second wall  31143 , or abut against the second wall  31143 . 
     In this embodiment, four forms, as shown in  FIGS. 8, 10, 11, and 12 , are presented to indicate the engagement between the first holder  311  and the second holder  312 . 
     Form 1 
     As shown in  FIG. 8 , the main side  3121  of the second holder  312  abuts against the pressing wall  3115  of the first holder  311 , and the auxiliary side  3122  of the second holder  312  abuts against the second wall  31143  of the recess  3114 . 
     Form 2 
     As shown in  FIG. 10 , the main side  3121  of the second holder  312  abuts against the pressing wall  3115  of the first holder  311 , and the auxiliary side  3122  of the second holder  312  keeps a distance from the second wall  31143  of the recess  3114 . 
     Form 3 
     As shown in  FIG. 11 , the main side  3121  of the second holder  312  covers and keeps a distance from the pressing wall  3115  of the first holder  311 , and the auxiliary side  3122  of the second holder  312  abuts against the second wall  31143  of the recess  3114 . 
     Form 4 
     As shown in  FIG. 12 , the main side  3121  of the second holder  312  covers and keeps a distance from the pressing wall  3115  of the first holder  311 , and the auxiliary side  3122  of the second holder  312  keeps a distance from the second wall  31143  of the recess  3114 . 
     The camera lens  3100  further includes a pressing ring  315  located on the image side surface of the first lens unit. 
     Sixth Embodiment 
     Referring to  FIG. 13 , the first holder  311 ′ of the lens holder  31 ′ includes a bottom surface  3111 ′, a top surface  3112 ′ opposite to the bottom surface  3111 ′, a side surface  3113 ′ adjacent to the accommodation space for connecting the top surface  3112 ′ to the bottom surface  3112 ′, and a pressing wall  3115 ′ extending from the side surface  3113 ′ for pressing on the first lens unit  321 ′. The first buckle  31141 ′ is formed on the side surface  3113 ′ near the accommodation space. 
     The second holder  312 ′ includes a main wall  3121 ′ with a light aperture  314 ′ and an auxiliary wall  3122 ′ extending perpendicularly from the main wall  3121 ′. The main wall  3121 ′ covers the top surface  3111 ′ of the first holder  311 ′. The auxiliary wall  3122 ′ abuts against the side surface  3113 ′ adjacent to the accommodation space, and the second buckle  31221 ′ is formed on the auxiliary wall  3122 ′. 
     In this embodiment, four forms, as shown in  FIGS. 13-16 , are presented to indicate the engagement between the first holder  311 ′ and the second holder  312 ′. 
     Form 1 
     As shown in  FIG. 13 , the auxiliary wall  3122 ′ of the second holder  312 ′ abuts against the pressing wall  3115 ′ of the first holder  311 ′. At the same time, the main wall  3121 ′ of the second holder  312 ′ abuts against the top surface  3112 ′ of the first holder  311 ′. 
     Form 2 
     As shown in  FIG. 14 , the auxiliary wall  3122 ′ of the second holder  312 ′ abuts against the pressing wall  3115 ′ of the first holder  311 ′. At the same time, the main wall  3121 ′ of the second holder  312 ′ keeps a distance from the top surface  3112 ′ of the first holder  311 ′. 
     Form 3 
     As shown in  FIG. 15 , the auxiliary wall  3122 ′ of the second holder  312 ′ keeps a distance from the pressing wall  3115 ′ of the first holder  311 ′. At the same time, the main wall  3121 ′ of the second holder  312 ′ abuts against the top surface  3112 ′ of the first holder  311 ′. 
     Form 4 
     As shown in  FIG. 16 , the auxiliary wall  3122 ′ of the second holder  312 ′ keeps a distance from the pressing wall  3115 ′ of the first holder  311 ′. At the same time, the main wall  3121 ′ of the second holder  312 ′ keeps a distance from the top surface  3112 ′ of the first holder  311 ′. 
     Seventh Embodiment 
     Referring to  FIGS. 17-21 , a camera lens  4100  includes a lens holder  41  and a lens group  42  positioned in the lens holder  41 . The lens holder  41  includes a first holder  411  and a second holder  412  covering the first holder  41  for forming an accommodation space  413 . The second holder  412  is formed with a light aperture  414 . The lens group  42  is received in the accommodation space  413  and includes an object side surface adjacent to the light aperture  414 . The first holder  411  abuts against the object side surface of the lens group  42 . The first holder  411  includes a first thread portion  41141 , and correspondingly the second holder  412  includes a second thread portion  41221  engaging with the first thread portion  41141 . By the two-piece structure, the first and second holders  411 ,  412  can made from different materials. For example, the second holder  4212  can be made from materials with high light absorptivity for reducing stray light and further for improving optical performance. 
     The lens group  42  is received in the accommodation space, and is concentric with the light aperture. In this embodiment, the lens group  42  includes a first lens unit  421  adjacent to the light aperture of the second holder  412  and a second lens unit  422  stacked on the first lens unit  221 . Further, the lens group  42  includes a third lens unit  423 , a fourth lens unit  424 , a fifth lens unit  425 , and a sixth lens unit  426 . 
     The first holder  411  includes a bottom surface  4111 , a top surface  4112  opposite to the bottom surface  4111 , a side surface  4113  connecting the top surface  4112  to the bottom surface  4111 , and a pressing wall  4115  pressing on the first lens unit  421 . A recess  4114  is formed by recessing from the top surface  4111  toward the bottom surface  4112 . The first thread portion  41141  is formed on the side surface  4113  in the recess  4114 . In the embodiment, the first thread portion  41141  is provided with an external thread. 
     The second holder  412  includes a main wall  4121  and an auxiliary wall  4122  extending perpendicularly from the main wall  4121 . A light aperture  414  is formed in the main wall  4121 . The auxiliary wall  4122  is provided with a second thread portion  41221  having an internal thread. The second holder  412  covers the top surface  4112  of the first holder  411  and the auxiliary wall  4122  is at least partially received in the recess  4114 . The first thread portion and the second thread portion  41141 ,  41221  engage with each other for assembling the first holder  411  with the second holder  412 . 
     Specifically, the recess  4114  is formed by a first wall  41142  connecting the top surface  41142 , and a second wall  41143  connecting the side surface  4113 . The first wall  41142  is a parallel wall and the second wall  41143  is a horizontal wall. The first thread portion  41141  is formed on the first wall  41142 , and the second thread portion  41221  is formed on a side of the second holder adjacent to the first wall  41142 . A direction of the engagement between the first thread and second thread is parallel to the second wall  41143 . The auxiliary wall  4122  can keep a distance from the second wall  41143 , or abut against the second wall  41143 . 
     By virtue of such a configuration, the first holder  411  can be easier removed from or assembled with the second holder  412 . And, because the second holder  412  can be removed from the first holder  411 , the second holder can be replaced by another second holder  412  with a bigger light aperture, according to different requirements. In addition, the pressing wall  4115  abuts against the object side surface of the first lens unit  421  for serving as a pressing ring for positioning the first lens unit  421  on the first holder  411 . The camera lens  4100  further includes a pressing ring  415  located on the image side surface of the first lens unit. 
     In this embodiment, four forms, as shown in  FIGS. 17, 19-21 , are presented to indicate the engagement between the first holder  411  and the second holder  412 . 
     Form 1 
     As shown in  FIG. 17 , the main wall  4121  of the second holder  412  abuts against the pressing wall  4115  of the first holder  411 , while, the auxiliary wall  4122  of the second holder  412  abuts against the second wall  41143  of the recess  4114 . 
     Form 2 
     As shown in  FIG. 19 , the main wall  4121  of the second holder  412  abuts against the pressing wall  4115  of the first holder  411 , while, the auxiliary wall  4122  of the second holder  412  keeps a distance from the second wall  41143  of the recess  4114 . 
     Form 3 
     As shown in  FIG. 20 , the main wall  4121  of the second holder  412  keeps a distance from the pressing wall  4115  of the first holder  411 , while, the auxiliary wall  4122  of the second holder  412  abuts against the second wall  41143  of the recess  4114 . 
     Form 4 
     As shown in  FIG. 21 , the main wall  4121  of the second holder  412  keeps a distance from the pressing wall  4115  of the first holder  411 , while, the auxiliary wall  4122  of the second holder  412  keeps a distance from the second wall  41143  of the recess  4114 . 
     Eighth Embodiment 
     Referring to  FIG. 22 , the first holder  411 ′ of the lens holder  41 ′ includes a bottom surface  4111 ′, a top surface  4112 ′ opposite to the bottom surface  4111 ′, a side surface  4113 ′ adjacent to the accommodation space for connecting the top surface  4112 ′ to the bottom surface  4112 ′, and a pressing wall  4115 ′ extending from the side surface  4113 ′ for pressing on the first lens unit  421 ′. The first thread portion  41141 ′ is formed on the side surface  4113 ′ near the accommodation space. The first thread portion  41141 ′ is provided with an internal thread. 
     The second holder  412 ′ includes a main wall  4121 ′ with a light aperture  414 ′ and an auxiliary wall  4122 ′ extending perpendicularly from the main wall  4121 ′. The main wall  4121 ′ covers the top surface  4111 ′ of the first holder  411 ′. The auxiliary wall  4122 ′ abuts against the side surface  4113 ′ adjacent to the accommodation space, and the second thread portion  41221 ′ is formed on the auxiliary wall  4122 ′. The second thread portion  41221 ′ is provided with an external thread. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms where the appended claims are expressed.