Centering device and centering method for aspheric molded lens

Abstract

The invention discloses a centering device for an aspheric molded lens, which comprises a falling table, a centering auxiliary mold core is arranged on the falling table, and the centering auxiliary mold core comprises a base with the outer diameter being the same as that of a to-be-centered mold sleeve and a cylinder with the outer diameter being the same as that of a to-be-centered raw material small ball; a fixing seat and a positioning block for positioning the base are further arranged on the falling-off table, a guide rail is arranged on the fixing seat, a slidable centering rod is arranged on the guide rail, and the centering rod can make contact with the column body in the sliding process. The invention further discloses a centering method adopting the centering device. A traditional centering device structure for punching the bottom of the auxiliary mold core is abandoned, the upper mold core can be installed firstly, then the centering rod is removed, and therefore the problem that in the prior art, due to the fact that the centering device is removed firstly, raw material small balls deviate is effectively solved, the centering accuracy is effectively improved, and the deviation phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the field of aspheric molded lens processing, and in particular to a centering device and a centering method for an aspheric molded lens. Background Art

[0002] Lens molding technology is a high-precision optical component processing technology that can press and mold precise aspheric optical parts in one go. During the molding process of one-shot molding lenses, if the aspheric surface of the lower mold core is deep and the aspheric shape features are obvious, such as Figure 1 As shown in the figure, the raw material ball can easily roll down to the center of the aspheric concave surface of the lower die core, and there is no need to center the raw material ball. Figure 2 As shown, it is difficult for the raw material ball to completely roll down to the center of the lower mold core by its own weight. If this happens, after the molding is carried out, the processed lens will have an uneven outer diameter, that is, the flesh is biased, which will directly affect the performance of the lens. In order to solve the flesh bias problem, the prior art also proposes some centering devices. The centering device in the prior art is to use an auxiliary mold core with the same outer dimensions as the upper mold core, and to open a hole at the bottom of the auxiliary mold core that matches the shape of the raw material ball. After the assembled mold sleeve, lower mold core, raw material ball, etc. are placed, the auxiliary mold core is installed, and the raw material ball is centered through the hole at the bottom, and then the auxiliary mold core is removed and replaced with the real upper mold core. Since this centering device removes the auxiliary mold core first and then replaces the upper mold core, and the removal of the auxiliary mold core itself is likely to cause the raw material ball to move, so when the upper mold core is replaced, the position of the raw material ball may have shifted relative to the centering, and it is still easy to cause the flesh bias phenomenon in the end. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a centering device and a centering method for aspheric molded lenses that can effectively improve the centering accuracy of the original ball and prevent the occurrence of meat deviation.

[0004] Technical solution: The centering device for the aspheric molded lens described in the present invention includes a drop-off platform, on which is provided an auxiliary centering mold core, the auxiliary centering mold core includes a base with an outer diameter the same as that of the mold sleeve to be centered and a cylinder with an outer diameter the same as that of the original ball to be centered; the drop-off platform is also provided with a fixed seat and a positioning block for providing positioning for the base, the fixed seat is provided with a guide rail, the guide rail is provided with a slidable centering rod, and the centering rod can contact the column during the sliding process.

[0005] Furthermore, the centering auxiliary mold core is arranged at the center of the falling platform, and there are two groups of guide rails and centering rods, one of which is arranged on the left side of the centering auxiliary mold core, and the other is arranged on the right side of the centering auxiliary mold core, and the positioning block is arranged on the upper side of the centering auxiliary mold core. In this way, there is a group of guide rails and centering rods on each side, which can better locate the position of the column, thereby further improving the centering accuracy.

[0006] Furthermore, the guide rail is provided with a slider, the slider is provided with a fixing block, and the centering rod is fixed on the fixing block. In this way, the centering rod does not need to directly contact the guide rail, and will not be worn during repeated sliding, which can effectively improve the service life.

[0007] Furthermore, a slidable stopper is provided on the guide rail, the stopper is located between the slide block and the auxiliary centering mold core, and a locking mechanism is provided on the stopper. Thus, when the centering rod slides to a position in contact with the column, the locking mechanism on the stopper can be locked to limit the centering rod, and the position of the column can be accurately recorded, so as to perform more accurate centering of the raw material pellets later.

[0008] Furthermore, one end of the positioning block has a V-shaped or arc-shaped surface, which is adapted to the shape of the base of the centering auxiliary mold core, so that the base and the positioning block can be more closely fitted, and the centering accuracy can be further improved.

[0009] Furthermore, the other end of the positioning block has a U-shaped groove, a middle positioning hole is provided in the middle of the positioning block, a left positioning hole is provided on the left, and a right positioning hole is provided on the right. In this way, the positioning block can be more accurately positioned through the middle positioning hole, the left positioning hole and the right positioning hole, and the U-shaped groove is to avoid the screw hole on the shedding table.

[0010] Furthermore, one end of the centering rod is provided with an arc-shaped surface, which is adapted to the cylindrical shape of the centering auxiliary mold core, so that the cylindrical body and the centering rod can be more closely fitted, and the centering accuracy can be further improved.

[0011] Furthermore, the fixing seat is provided with a U-shaped long groove, and a plurality of screw holes are provided on the drop-off platform at the bottom of the U-shaped long groove. Since the fixing seat is used to install the guide rail, the guide rail and the fixing seat can be translated along the direction of the U-shaped long groove through the screw holes on the U-shaped long groove and the bottom drop-off platform, so as to facilitate fine adjustment of the position of the guide rail.

[0012] The centering method using the centering device of the aspheric molded lens comprises the following steps: a. Move the centering auxiliary mold core on the shedding table so that its base fits the positioning block; b. Slide the centering rod so that one end of it contacts the column of the centering auxiliary mold core; c. Remove the auxiliary centering mold core, and place the assembled mold sleeve, lower mold core, and raw material ball combination at the original location of the auxiliary centering mold core, so that the mold sleeve fits the positioning block and the raw material ball contacts one end of the centering rod; d. Install the upper mold core to press down the raw material ball; e. Slide the centering rod outward to remove it.

[0013] The centering method using the centering device of the aspheric molded lens comprises the following steps: a. Move the centering auxiliary mold core on the shedding table so that its base fits the positioning block; b. Slide the centering rods on the left and right sides so that one end of the two centering rods are in contact with the column of the centering auxiliary mold core; c. Slide the right stopper to the position where it contacts the right slider, lock the locking mechanism in the right stopper, and limit the right centering rod; d. Slide the left centering rod outward, remove the centering auxiliary mold core, and place the assembled mold sleeve, lower mold core, and raw material ball combination at the original location of the centering auxiliary mold core, so that the mold sleeve fits the positioning block, and then slide the left centering rod inward so that the raw material ball contacts the centering rods on both sides; e. Install the upper mold core to press down the raw material ball; f. Slide the centering rods on both sides outward to remove them.

[0014] Beneficial effects: The present invention discloses a centering device and a centering method for an aspheric molded lens, which have the following beneficial effects compared with the prior art: 1. The centering device of the present invention designs a centering auxiliary mold core according to the size of the mold sleeve to be centered and the raw material ball, that is, the outer diameter of the base of the centering auxiliary mold core is set to be the same as the mold sleeve, and the outer diameter of the column is set to be the same as the raw material ball, and the base is positioned by a positioning block, and the column is positioned by a centering rod that can slide on a guide rail, abandoning the traditional centering device structure of drilling holes at the bottom of the auxiliary mold core, and can achieve the installation of the mold core first and then remove the centering rod, thereby effectively avoiding the problem of raw material ball deviation caused by first removing the centering device in the prior art, effectively improving the centering accuracy, and avoiding the occurrence of meat deviation; 2. The centering device of the present invention provides a stopper with a locking mechanism between the slider and the auxiliary centering mold core, so that when the centering rod slides to a position in contact with the column, the locking mechanism on the stopper can be locked to limit the centering rod, and the position of the column can be accurately recorded, so as to perform more accurate centering of the raw material pellets later; 3. The centering device of the present invention sets a V-shaped or arc-shaped surface at one end of the positioning block to match the base shape of the centering auxiliary mold core; sets an arc-shaped surface at one end of the centering rod to match the column shape of the centering auxiliary mold core. This can make the base and the positioning block fit better, and the column and the centering rod fit better, which can effectively improve the centering accuracy. 4. The centering device of the present invention is provided with a U-shaped long groove on the fixing seat, and a plurality of screw holes are provided on the shedding platform at the bottom of the U-shaped long groove, so that the fixing seat and the guide rail can be translated along the direction of the U-shaped long groove, which is convenient for fine-tuning the position of the guide rail; 5. The centering method of the present invention creatively changes the order of installing the upper mold core and removing the centering device in the prior art. That is, the present invention first installs the upper mold core and then removes the centering rod. This can effectively avoid the problem of small ball deviation of the raw material caused by first removing the centering device in the prior art, effectively improve the centering accuracy, and avoid the occurrence of meat deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a mold in the prior art in which the aspheric surface of the lower mold core is deep and the aspheric shape features are obvious; Figure 2 This is a mold structure diagram in the prior art where the aspheric surface of the lower mold core is shallow and the aspheric shape features are not obvious; Figure 3 A three-dimensional diagram of a centering device in a specific embodiment of the present invention; Figure 4 A cross-sectional view of a centering device in a specific embodiment of the present invention; Figure 5 A top view of a centering device in a specific embodiment of the present invention; Figure 6 It is a structural diagram of a shedding platform in a specific embodiment of the present invention; Figure 7 It is a structural diagram of a fixing base in a specific implementation manner of the present invention. DETAILED DESCRIPTION

[0016] During the molding process of the one-shot lens, if the aspheric surface of the lower mold core is deep and the aspheric shape features are obvious, such as Figure 1 As shown in the figure, the raw material ball can easily roll down to the center of the aspheric concave surface of the lower die core, and there is no need to center the raw material ball. Figure 2 As shown, it is difficult for the small ball of raw material to completely roll down to the center of the lower mold core by its own weight. If this happens and the lens is pressed into shape, the outer diameter of the processed lens will be uneven, that is, it will be fleshy, which will directly affect the performance of the lens.

[0017] In order to improve the centering accuracy of the raw material ball and solve the problem of meat deviation, this specific embodiment discloses a centering device for aspheric molded lenses. Figure 3-5 As shown, the centering device includes a shedding platform 1. Figure 6 As shown, the center of the shedding platform 1 is provided with an air suction hole 12, and three screw holes 11 are provided around it. Figure 3 As shown, the fall-off platform 1 is provided with a centering auxiliary mold core 2, which includes a base 21 with the same outer diameter as the mold sleeve 83 to be centered and a column 22 with the same outer diameter as the raw material ball 85 to be centered. The fall-off platform 1 is also provided with a fixed seat 5 and a positioning block 3 for positioning the base 21.

[0018] like Figure 7 As shown, the fixing seat 5 includes a fixing portion 52, one end of which is provided with a plurality of positioning holes 53, and the other end of which is provided with a U-shaped long groove 51. Figure 6 As shown, a plurality of screw holes are provided on the shedding platform 1 at the bottom of the U-shaped long groove 51. Figure 3 As shown, the guide rail 4 is provided with a plurality of guide rail positioning holes 41, and the size of the guide rail positioning holes 41 and the distance between two adjacent guide rail positioning holes 41 are the same as the positioning holes 53 on the fixing seat 5, so that the guide rail 4 is easily installed on the fixing seat 5. Figure 3-4 As shown, a guide rail 4 is provided on the fixing seat 5, a slider 42 is provided on the guide rail 4, a fixing block 6 is provided on the slider 42, a centering rod 7 is fixedly provided on the fixing block 6, and the centering rod 7 passes through a hole 61 on the side wall of the fixing block 6. The centering rod 7 can also be directly set on the guide rail 4. An arc-shaped surface is provided at one end of the centering rod 7, which is adapted to the shape of the column 22 of the centering auxiliary mold core 2, so as to facilitate positioning of the column 22.

[0019] like Figure 3-5 As shown, the guide rail 4 is also provided with a slidable stopper 43, which is located between the slider 42 and the auxiliary centering mold core 2, and a locking mechanism is provided on the stopper 43. Common locking mechanisms may be screw holes and screws. In this way, when the centering rod 7 slides to a position in contact with the column 22, the locking mechanism on the stopper 43 can be locked to limit the centering rod 7, so that the position of the column 22 can be accurately recorded, so that the raw material ball 85 can be more accurately centered later.

[0020] like Figure 3 and Figure 5 As shown, one end of the positioning block 3 has a V-shaped surface, which can also be an arc-shaped surface, which is compatible with the shape of the base 21 of the centering auxiliary mold core 2, so as to facilitate positioning of the base 21. The other end of the positioning block 3 has a U-shaped groove 34 to avoid the screw hole on the shedding platform 1. The middle of the positioning block 3 is provided with a middle positioning hole 33, the left side is provided with a left positioning hole 31, and the right side is provided with a right positioning hole 32, so that the positioning block 3 can find the position more accurately.

[0021] In order to improve the centering accuracy, there can be two sets of guide rails 4 and centering rods 7, one set of guide rails 4 and centering rods 7 is arranged on the left side of the centering auxiliary mold core 2, and the other set of guide rails 4 and centering rods 7 is arranged on the right side of the centering auxiliary mold core 2, such as Figure 3-4 The positioning block 3 is arranged on the upper side of the auxiliary centering mold core 2. When there are two sets of guide rails 4 and centering rods 7, similarly, there are also two sets of fixed seats 5, sliders 42 and fixed blocks 6 that cooperate therewith.

[0022] The mold to be centered is as follows Figure 4 As shown, it includes an upper mold core 81 and a lower mold core 82 arranged in a mold sleeve 83, and a raw material ball 85 arranged between the two mold cores. In addition, a mold ring 84 can also be included to control the overflow of the outer diameter of the lens.

[0023] For the case where there is one set of guide rail 4 and centering rod 7, this specific embodiment discloses a centering method using the above-mentioned centering device, including the following steps: a. Move the centering auxiliary mold core 2 on the shedding table 1 so that the base 21 fits with the positioning block 3; b. Slide the centering rod 7 so that one end of it contacts the column 22 of the centering auxiliary mold core 2; c. Remove the auxiliary centering mold 2, and place the assembled sleeve 83, the lower mold 82, and the raw material ball 85 in the original position of the auxiliary centering mold 2, so that the sleeve 83 fits the positioning block 3, and the raw material ball 85 contacts one end of the centering rod 7; d. Install the upper mold core 81 to press the raw material ball 85; e. Slide the centering rod 7 outwards to remove it.

[0024] For the case where there are two groups of guide rails 4 and centering rods 7, this specific embodiment discloses a centering method using the above-mentioned centering device, including the following steps: a. Move the centering auxiliary mold core 2 on the shedding table 1 so that the base 21 fits with the positioning block 3; b. Slide the centering rods 7 on the left and right sides so that one end of each centering rod 7 is in contact with the column 22 of the centering auxiliary mold core 2; c. Slide the right stopper 43 to a position where it contacts the right slider 42, lock the locking mechanism in the right stopper 43, and limit the right centering rod 7; d. Slide the left centering rod 7 outward, remove the centering auxiliary mold 2, and place the assembled mold sleeve 83, lower mold 82, and raw material ball 85 in the original position of the centering auxiliary mold 2, so that the mold sleeve 83 fits the positioning block 3, and then slide the left centering rod 7 inward, so that the raw material ball 85 is in contact with the centering rods 7 on both sides; e. Install the upper mold core 81 to press the raw material ball 85; f. Slide the centering rods 7 on both sides outward to remove them.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A centering device for an aspheric molded lens, characterized in that: The invention comprises a drop-off platform (1), on which a centering auxiliary mold core (2) is provided, and the centering auxiliary mold core (2) comprises a base (21) having an outer diameter identical to that of a mold sleeve (83) to be centered, and a column (22) having an outer diameter identical to that of a raw material ball (85) to be centered; the drop-off platform (1) is also provided with a fixed seat (5) and a positioning block (3) for providing positioning for the base (21), a guide rail (4) is provided on the fixed seat (5), and a slidable centering rod (7) is provided on the guide rail (4), and the centering rod (7) can contact the column (22) during the sliding process.

2. The centering device for the aspheric molded lens according to claim 1, characterized in that: The centering auxiliary mold core (2) is arranged at the center position of the falling platform (1), and there are two groups of guide rails (4) and centering rods (7), one group of guide rails (4) and centering rods (7) is arranged on the left side of the centering auxiliary mold core (2), and the other group of guide rails (4) and centering rods (7) is arranged on the right side of the centering auxiliary mold core (2), and the positioning block (3) is arranged on the upper side of the centering auxiliary mold core (2).

3. The centering device for the aspheric molded lens according to claim 2, characterized in that: The guide rail (4) is provided with a sliding block (42), the sliding block (42) is provided with a fixing block (6), and the centering rod (7) is fixed on the fixing block (6).

4. The centering device for the aspheric molded lens according to claim 3, characterized in that: The guide rail (4) is provided with a slidable stopper (43), the stopper (43) is located between the slide block (42) and the auxiliary centering mold core (2), and a locking mechanism is provided on the stopper (43).

5. The centering device for the aspheric molded lens according to claim 1, characterized in that: One end of the positioning block (3) has a V-shaped or arc-shaped surface, which is matched with the shape of the base (21) of the centering auxiliary mold core (2).

6. The centering device for the aspheric molded lens according to claim 5, characterized in that: The other end of the positioning block (3) has a U-shaped groove (34), a middle positioning hole (33) is provided in the middle of the positioning block (3), a left positioning hole (31) is provided on the left, and a right positioning hole (32) is provided on the right.

7. The centering device for the aspheric molded lens according to claim 1, characterized in that: One end of the centering rod (7) is provided with an arc-shaped surface, which is matched with the shape of the column (22) of the centering auxiliary mold core (2).

8. The centering device for the aspheric molded lens according to claim 1, characterized in that: The fixing seat (5) is provided with a U-shaped long groove (51), and a plurality of screw holes are provided on the falling platform (1) at the bottom of the U-shaped long groove (51).

9. A centering method using the centering device for the aspheric molded lens according to claim 1, characterized in that: The following steps are involved: a. Move the centering auxiliary mold (2) on the shedding table (1) so that the base (21) fits with the positioning block (3); b. Slide the centering rod (7) so that one end of the rod contacts the column (22) of the centering auxiliary mold (2); c. Remove the auxiliary centering mold (2), and place the assembled mold sleeve (83), the lower mold (82), and the raw material ball (85) at the original position of the auxiliary centering mold (2), so that the mold sleeve (83) fits with the positioning block (3), and the raw material ball (85) contacts one end of the centering rod (7); d. Install the upper mold core (81) to press the raw material ball (85); e. Slide the centering rod (7) outward to remove it.

10. A centering method using the centering device for the aspheric molded lens according to claim 4, characterized in that: The following steps are involved: a. Move the centering auxiliary mold (2) on the shedding table (1) so that the base (21) fits with the positioning block (3); b. Slide the centering rods (7) on the left and right sides so that one end of each centering rod (7) contacts the column (22) of the centering auxiliary mold (2); c. Slide the right stopper (43) to a position where it contacts the right slider (42), lock the locking mechanism in the right stopper (43), and limit the right centering rod (7); d. Slide the left centering rod (7) outward, remove the centering auxiliary mold (2), and place the assembled mold sleeve (83), lower mold (82), and raw material ball (85) at the original position of the centering auxiliary mold (2), so that the mold sleeve (83) fits with the positioning block (3), and then slide the left centering rod (7) inward so that the raw material ball (85) is in contact with both sides of the centering rod (7); e. Install the upper mold core (81) to press the raw material ball (85); f. Slide the centering rods (7) on both sides outward to remove them.

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