Focus on challenging optical components

Optical plastic lens and its injection molding method

by:ChangHui     2020-07-27
【 Patent abstract 】 The invention discloses a kind of optical plastic lenses, and by injection molding method, the relationship of the contain in concentric circles a optical effective area and the border region a week. The lens in the weekly border region has a building blocks, and by the inner section of the reduction and adjacent to the outer of the weekly line extension of the outside of the border region without inner shrinkage for space. For the space to allow the lens burrs generated in injection molding to accommodate at among them, so that they don't affect the lens assembly by. The invention adopts a exhaust duct with mould, wherein the mould in connected with the exhaust duct it has a configuration, through the inside shrink configuration transfer out of the optical plastic lenses in the shrink section. The invention implementation example of optical plastic lenses and injection molding method, can reduce processing time and cost. 【 Patent description 】 Optical plastic lenses and injection molding method ( Technology 】 ( 0001] The invention relates to an optical plastic lens and the method of injection molding, and particularly with regard to a kind of local inner shrinkage configuration of optical plastic lenses and injection molding method. 【 Technical background 】 ( 0002] Plastic lenses in injection molding, the mold closed completely after the molten plastic inside through the gate into the mold cavity, the volume of the mold cavity is still dominated by air, if not the air completely out of the mold cavity, and the remnant of the air will fever due to compression, and form the high temperature so that on the finished product produce scorch and burn skin surface defects; Moreover, even if have not reached the degree of high temperature status inside the mold cavity, also can produce the molten plastic in the mold cavity filling the situation of insufficient, and not conducive to finished product forming the shape of the transfer. Higher requirements on precision of portable mobile devices with the application of camera lens, forming the improvement of exhaust, are also important, in order to prevent the defect occurs, usually in the mold parting surface, PL) Setting the exhaust duct, its shallow groove connected to mold in the shape of the external, can make originally exist in the mold cavity air to escape, but easily due to the flow of the molten plastic burrs in the exhaust crossing. Japan's first JP2008 - patent To reveal an exhaust means is 126611 a will exhaust duct as forming part of the shape, as shown in figure 1 is shown in figure 1 a and b, is the first JP2008 - the Japanese patent Proposed in 126611 a number of existing optical plastic lenses 1, the existing plastic lenses I has an optical Ib and the border region a week If effective area, and the two concentric circles; Among them, the weekly If border region with a gate Ig and located at the border gate opposite the Ig, protrude the weekly If the burrs of 15. 15 out because of the burrs in the border region If affect the existing plastic lens assembly, depend, I need to will the burrs in machining way 15 resection, and thus increase the processing cost. 【 The invention content 】 ( 0003] The present invention provides a manufacturing optical plastic lenses in injection molding way, the relationship between lens consists in concentric circles of a optical effective area and the border region a week, in the border region has one inside shrink section, inside the building section has a segment outer edge, and the building section and adjacent to the outer of the weekly border no inner shrinkage outer extension line into one for space, the burrs generated by the lens injection molding process will form in the shrink section edge and accommodate in the for space, and the burr does not exceed the weekly border line extension of the outside of the building, in order to make the flash will not affect the lens later assembly, to rely on. ( 0004] The present invention provides a manufacturing injection molding method of the optical plastic lens, the exhaust duct of a mold, and the mold inside the exhaust duct connecting the place has a shrinkage configuration to transfer out of the optical plastic lenses within the section. ( 0005] The invention implementation example of optical plastic lenses and injection molding method, can reduce processing time and cost. ( 0032] The invention of the optical plastic lenses first concrete implementation example, refer to schematic diagram to figure 2 c, 2 A, respectively is the top view of the optical plastic lenses and A - A 'line and B - Section B 'line. In the first concrete implementation case, the optical plastic lens 2 contains an optical zone 21 and one for bearing assembly on peripheral area of the optical plastic lens 2 22. The optical plastic lenses in its surrounding area 22 has a 2 section, inside the building section has a segment outer edge, and the building section and adjacent to the outer border of the weekly 22 no inner shrinkage outer extension of line in a space for 22 a, und 22 outer border region with another gate 22 b relative to the building blocks. According to the invention of plastic injection molding method, the plastic optical lens in the process of injection molding products of 2 burrs will form in the shrink section 23 of the outside of the flange and the surrounding area within 22 no shrinkage between the extension lines within the space for 22 a, and the burr 22 23 size does not exceed the weekly border line extension of the outside of the building. In this example, the lens diameter of 2 to 3 Y. 54cm ; The outer building section contains a arc R1, Rl and the arc centering with the optical plastic lens 2 the same circle, and the configuration of the space for 22 a, as shown in figure 2 a shows, by the curvature radius of 1. 7 cm adjacent no inner arc Rl and shrinkage of the weekly surrounded by 22 extended lines of the outside of the border region, and the space for 22 a D at the center of the width of 0. 8 cm, the width of the centre D is defined as A - A 'line 22 A flange and the space for the weekly 22 no border region within the outer edge of the distance between the extension lines. Figure 2 and figure 2 c b of the lens delay A - 2 respectively A 'line and B - B 'line section, as shown, only figure 2 B have the space for 22 a and the gate 22 B. ( 0033] In the first concrete implementation example of the present invention, the optical plastic lens 2 in injection molding, the exhaust duct is constructed with A has A 30 mold 3, refer to figure 3 A and 3 b, its are used by the example of the top view of the mould 3 and A minus A 'line profile. 30 for ruling out the exhaust air in the cavity of the mould 3 to improve the precision of the finished product molding shape the transcription, as shown in figure 3 b, the exhaust duct 30 better land is located in the mold the parting surface of 3 PL. In the injection molding process, into the mold cavity of 3 in the flow of the molten plastic makes in the exhaust duct optical plastic lenses, connect to the outer edge 30 form the burrs 23, due to the mold 3 connected to the exhaust duct 30 within the outer edge of a configuration, the building configuration within the direct transfer of the lens 2 sections, the flash will hold in the shrink section 23 of the 22 a, for the space and the burrs 23 shall not exceed the for 22 a outer space. In addition, the mold 3 has a gate in relative to the configuration. Therefore, the use of the present invention FIG. 3 a Figure 3 b mould 3 made the optical plastic lens 2, as shown in figure 2 a - As shown in figure 2 b the burrs 23 will not affect the lens 2 later assembly, depend, without additional process to remove the burrs 23, this advantage can reduce processing time and cost.
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