Abstract:
A protection structure for an optical lens module includes a female die, a male die, and an ejector plate. The male die includes a plurality of cores and second cavities. Locating rings are provided on the cores or in the second cavities to protect the cores from tearing and wearing so as to extend their lifespan.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a protection structure of an optical lens module, and more particularly to one having locating rings provided between cores and second cavities of a male die so as to protect the cores from being worn easily. 
         [0003]    2. Description of the Related Prior Art 
         [0004]    A conventional module for optical lens, as shown in  FIG. 13 , comprises a male die A and a female die A 5 . The male die A comprises a roller bearing A 1  a core A 2 . Both the roller bearing A 1  and the core A 2  are in post shape and secured in a hole A 3 . The roller bearing A 1  is provided with a number of balls A 4  therein. One side of the roller bearing A 1  engages with the inner wall of the male die A, and the other side of the roller bearing A 1  engages with the outer wall of the core A 2 . One end of the core A 2  has a cutting section A 21  matching with a plane A 31  of the male die A and corresponding to a plane A 52  of a cutting section A 51  of the female die A 5 . The cutting section A 51  and the plane A 52  correspond to the cutting section A 21  and the plane A 31  to form a cavity. 
         [0005]    The balls A 4  of the roller bearing A 1  may be in different sizes during producing procedure. The more balls A 4 , the more differences there will be. If the optical lens are made in oval or any other shapes but round shapes, the shapes of the roller bearings A 1  and the core A 2  have to be changed to accommodate the oval shape of the optical lens. This increases the cost of manufacture. 
       SUMMARY OF THE INVENTION 
       [0006]    According to the present invention, there is provided a protection structure for an optical lens module comprising a female die, the female die having a plurality of first cavities therein, each of the first cavities being provided with a female mold block; a male die, the male die having a plurality of cores and second cavities corresponding in position and in number to the first cavities of the female die, the second cavities being adapted for insertion of the cores; an ejector plate, the ejector plate having holes corresponding in position and in number to the second cavities of the male die, a plurality of guide rods and springs being provided between the male die and the ejector plate; and characterized by that locating rings are provided between the second cavities and the cores of the male die, and a lubricating member is provided on each of the locating rings. 
         [0007]    It is the primary object of the present invention to provide a protection structure for an optical lens module, which eliminates direct contact of the cores with the first cavities and the second cavities, thus extending the lifespan of the module as well as increasing the engagement of the locating rings and the second cavities to make the manufacture more precise. 
         [0008]    It is another object of the present invention to provide a protection structure for an optical lens module, which provides locating rings and lubricating members in accordance with the cores in different size or in different shape. 
         [0009]    It is a further object of the present invention to provide a protection structure for an optical lens module, which provides a lubricating member to minimize friction of the cores. 
         [0010]    It is another further object of the present invention to provide a protection structure for an optical lens module, which provides a supporting unit to sustain the ejector plate so that the cores will not be deformed under the pressure easily, which also maintains the cores in a horizontal status constantly. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is an exploded view of a first embodiment of the present invention; 
           [0012]      FIG. 2  is a perspective view of a core of the first embodiment of the present invention; 
           [0013]      FIG. 3  is a cross-sectional view of the first embodiment of the present invention; 
           [0014]      FIG. 4  is a cross-sectional view of the first embodiment of the present invention in operating stats; 
           [0015]      FIG. 5  is a perspective view of a male die and locating members of a second embodiment of the present invention; 
           [0016]      FIG. 6  is a cross-sectional view of the second embodiment of the present invention; 
           [0017]      FIG. 7  is a perspective view of a core of a third embodiment of the present invention; 
           [0018]      FIG. 8  is a perspective view of a male die provided with inserting blocks of a fourth embodiment of the present invention; 
           [0019]      FIG. 9  is a perspective view of a core of a fifth embodiment of the present invention; 
           [0020]      FIG. 10  is a perspective view of a male die provided with inserting blocks of a sixth embodiment of the present invention; 
           [0021]      FIG. 11  is a side view of the present invention showing a supporting unit; 
           [0022]      FIG. 12  is a side view of the present invention in operating status; and 
           [0023]      FIG. 13  is a cross-sectional view of the prior art. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0024]    As shown in  FIGS. 1 and 3 , a first preferred embodiment of the present invention comprises a female die  1 , a male die  2 , an ejector plate  3 , and locating rings  4 . 
         [0025]    The female die  1  is formed with a plurality of first cavities  11 . Each first cavity  11  is provided with a female mold block  12  therein. 
         [0026]    The male die  2  comprises a movable mode plate  2 A, a retaining plate  2 B and a plurality of cores  22 . The movable mode plate  2 A and the retaining plate  2 B are formed with a plurality of second cavities  21 A and third cavities  21 B corresponding in position and in number to the first cavities  11  of the female die  1 . The second cavities  21 A and the third cavities  21 B are adapted for insertion of the cores  22 . 
         [0027]    The ejector plate  3  is formed with a plurality of holes  31  corresponding in position and in number to the second cavities  21 A and third cavities  21 B of the male die  2  for securing the cores  22 . The ejector plate  3  further comprises guide rods  32  and springs  33  located between the male die  2  and the ejector plate  3 . 
         [0028]    Each of the locating rings  4  is disposed between the second cavity  21 A and the third cavity  21 B of the male die  2  and the core  22 . 
         [0029]    As shown in  FIGS. 2 and 3 , the locating ring  4  is disposed on the core  22 , corresponding in position to the second cavity  21 A and the third cavity  21 B of the male die  2 . The locating ring  4  has an outer diameter slightly larger than that of the core  22  and is tightly attached on the core  22 . A lubricating member  5  is provided on the locating ring  4 . 
         [0030]    A supporting unit  6  is externally provided on the male die  2  and the ejector plate  3 . 
         [0031]    As shown in  FIG. 3  the male die  2  remains a distance with the ejector plate  3 , and the cores  22  remains a distance from the first cavities  11  of the female die  1 . To operate the present invention, pour raw material A into the module, and then push the ejector plate  3  towards the male die  2 , which links the guiding rods  32 , the cores  22  towards the first cavities  11  of the female die  1  and compresses the springs  33 . The raw material A will then be forged to the shape by the cores  22 . 
         [0032]      FIGS. 5 and 6  show a second embodiment of the present invention. The second cavities  21 A and the third cavities  21 B of the male die  2  are formed with recesses  211 , respectively. A locating ring  4 A is provided in each of the recesses  211  of the second cavities  21 A and the third cavities  21 B of the male die  2 . The locating ring  4 A has an inner diameter slightly smaller than those of the second cavity  21 A and the third cavity  21 B. The locating ring  4 A is tightly secured in the recess  211 . The lubricating member  5  is provided in the locating ring  4 A. 
         [0033]      FIG. 7  shows a third embodiment of the present invention. A core  22 B is provided with a plurality of inserting blocks  7  thereon corresponding in position to the second cavity  21 A and the third cavity  21 B. Each of the inserting blocks  7  has an outer diameter slightly larger than that of the core  22 B. The lubricating member  5  is provided on each of the inserting blocks  7 . 
         [0034]      FIG. 8  shows a fourth embodiment of the present invention. Inserting blocks  7 A are provided around inner walls of the second cavities  21 A and the third cavities  21 B. The lubricating member  5  is provided on each of the inserting blocks  7 A. 
         [0035]      FIGS. 9 and 10  show a fifth embodiment and a sixth embodiment of the present invention. The first cavities  11 , the second cavities  21 A, the third cavities  21 B, and the cores  22 C are all made in oval-like shape. The shape of the core  22 C is not limited. The inserting blocks  7 A are provided on the core  22 C corresponding in position to the second cavity  21 A and the third cavity  21 B, or the inserting blocks  7 A are provided in each of the second cavities  21 A and the third cavities  21 B of the male die  2 . The lubricating member  5  is provided on each of the inserting blocks  7  and  7 A. 
         [0036]    The lubricating member  5  on the locating rings  4 ,  4 A and the inserting blocks  7 ,  7 A is made of either Graphite or polytetrafluoroethylene (PTFE) material. The lubricating member  5  bulges out slightly from the locating rings  4 ,  4 A, and the inserting blocks  7 ,  7 A and can be contact with the first cavity  11  of the female die  1 , the second cavity  21 A and the third cavity  21 B of the male die  2  when operating, producing lubricating effect. 
         [0037]    The cores  22 ,  22 A,  22 B and  22 C may be either with or without the lubricating member  5 , extending their service life. However, with the lubricating member  5 , the lifespan may be even longer. The locating rings  4 ,  4 A and the inserting blocks  7 ,  7 A is made of polytetrafluoroethylene (PTFE) material, providing a wearable character and lubricating effect. 
         [0038]    Furthermore, during installation, the welding process may cause the locating rings  4 ,  4 A and the inserting blocks  7  and  7 A to deform and their sizes may be larger than they are designed. For instance, the locating ring  4  is composed of two halves secured on the core  22  and welded together. After the weld, the outer diameter of the locating ring  4  is larger than the inner diameters of the second cavity  21 A and the third cavity  21 B of the male die  2 , but a modification on the locating ring  4  will shrink the diameter until the size of the locating ring  4  conforms to the most desirable measurement. 
         [0039]    As shown in  FIGS. 11 and 12 , the supporting unit  6  externally provided on the male die  2  and the ejector plate  3  provides a supporting effect and facilitates the reciprocation of the cores  22 ,  22 A,  22 B, ad  22 C without producing noise and extending the service life.