Centering device and centering method for aspherical molded lenses

Abstract

This invention discloses a centering device for aspherical molded lenses, including a release platform with a centering auxiliary mold core on the release platform. The centering auxiliary mold core includes a base with an outer diameter identical to that of the mold sleeve to be centered and a cylinder with an outer diameter identical to that of the raw material sphere to be centered. The release platform also includes a fixing seat and a positioning block for positioning the base. The fixing seat has a guide rail, and the guide rail has a slidable centering rod, which can contact the cylinder during sliding. This invention also discloses a centering method using the above-mentioned centering device. This invention abandons the traditional centering device structure that drills holes at the bottom of the auxiliary mold core, enabling the upper mold core to be installed first and then the centering rod to be removed. This effectively avoids the problem of raw material sphere displacement caused by removing the centering device first in the prior art, effectively improving centering accuracy and avoiding the occurrence of uneven centering.

Description

Technical Field

[0001] This invention relates to the field of aspherical molded lens processing, and in particular to a centering device and method for aspherical molded lenses. Background Technology

[0002] Lens molding technology is a high-precision optical component processing technology that enables the one-time molding of precise aspherical optical parts. In the one-time molding process, for lenses with deep aspherical surfaces and distinct aspherical shape characteristics in the lower mold core, such as... Figure 1 As shown, the raw material ball easily rolls automatically onto the center of the aspherical concave surface of the lower mold core, in which case there is no need to center the raw material ball. However, for cases where the aspherical surface of the lower mold core is shallow and the aspherical shape characteristics are not obvious, such as... Figure 2 As shown, the raw material ball cannot roll completely to the center of the lower mold core under its own weight. When this happens, the resulting lens will have an uneven outer diameter, or "softness," directly affecting its performance. To address this issue, existing technologies have proposed several centering devices. One such device uses an auxiliary mold core with the same dimensions as the upper mold core. The bottom of the auxiliary mold core has a hole that matches the shape of the raw material ball. After the assembled mold sleeve, lower mold core, and raw material ball are in place, the auxiliary mold core is installed, and the ball is centered through the hole at its bottom. Then, the auxiliary mold core is removed and replaced with the actual upper mold core. However, this centering device involves removing the auxiliary mold core first and then replacing it with the upper mold core. Removing the auxiliary mold core itself can easily cause the raw material ball to shift. Therefore, when the upper mold core is replaced, the position of the raw material ball may have already shifted relative to its initial centering position, ultimately leading to the "softness" problem again. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a centering device and method for aspherical molded lenses that can effectively improve the centering accuracy of the raw material spheres and prevent the occurrence of unevenness.

[0004] Technical solution: The centering device for aspherical molded lenses of the present invention includes a release platform, on which a centering auxiliary mold core is provided. The centering auxiliary mold core includes a base with an outer diameter the same as that of the mold sleeve to be centered and a column with an outer diameter the same as that of the raw material ball to be centered. The release platform is also provided with a fixed seat and a positioning block for positioning the base. The fixed seat is provided with a guide rail, and the guide rail is provided with a slidable centering rod. The centering rod can contact the column during the sliding process.

[0005] Furthermore, the centering auxiliary mold core is positioned at the center of the release platform. There are two sets of guide rails and centering rods: one set is located on the left side of the centering auxiliary mold core, and the other set is located on the right side. A positioning block is located on the upper side of the centering auxiliary mold core. This arrangement, with one set of guide rails and centering rods on each side, allows for better positioning of the column, thereby further improving centering accuracy.

[0006] Furthermore, the guide rail is equipped with a slider, and the slider has a fixing block, with the centering rod fixed to the fixing block. This eliminates the need for the centering rod to directly contact the guide rail, preventing wear during repeated sliding and effectively extending its service life.

[0007] Furthermore, the guide rail is equipped with a slidable stop, located between the slider and the centering auxiliary mold core, and the stop is equipped with a locking mechanism. Thus, when the centering rod slides to the position of contact with the column, the locking mechanism on the stop can limit the centering rod's position, accurately recording the column's location for more precise subsequent centering of the raw material ball.

[0008] Furthermore, one end of the positioning block has a V-shaped or arc-shaped surface that matches the shape of the base of the centering auxiliary mold core. This allows the base and the positioning block to fit more closely, further improving centering accuracy.

[0009] Furthermore, the other end of the positioning block has a U-shaped groove, a central positioning hole in the middle, a left positioning hole on the left, and a right positioning hole on the right. These central, left, and right positioning holes allow the positioning block to more accurately locate its position, while the U-shaped groove avoids the screw holes on the detachment platform.

[0010] Furthermore, one end of the centering rod has an arc-shaped surface that matches the cylindrical shape of the centering auxiliary mold core. This allows the cylinder and the centering rod to fit more closely, further improving centering accuracy.

[0011] Furthermore, the mounting base is provided with a U-shaped groove, and the bottom of the U-shaped groove has a plurality of screw holes on the detachment platform. Since the mounting base is used to install the guide rail, the guide rail and the mounting base can be translated along the direction of the U-shaped groove through the U-shaped groove and the screw holes on the bottom detachment platform, which facilitates fine adjustment of the guide rail position.

[0012] The centering method using the centering device for the aspherical molded lens includes the following steps:

[0013] a. Move the centering auxiliary mold core on the release platform so that its base fits into the positioning block;

[0014] b. Slide the centering rod until one end contacts the cylinder of the centering auxiliary mold core;

[0015] c. Remove the centering auxiliary mold core, and place the assembled mold sleeve, lower mold core, and raw material ball combination in the original position of the centering auxiliary mold core, so that the mold sleeve fits with the positioning block and the raw material ball contacts one end of the centering rod.

[0016] d. Install the upper mold core and press down the raw material ball;

[0017] e. Slide the centering rod outward to move it out.

[0018] The centering method using the centering device for the aspherical molded lens includes the following steps:

[0019] a. Move the centering auxiliary mold core on the release platform so that its base fits into the positioning block;

[0020] b. Slide the centering rods on the left and right sides so that one end of each centering rod contacts the cylinder of the centering auxiliary mold core;

[0021] c. Slide the right stop block to the position where it contacts the right slider, lock the locking mechanism in the right stop block, and limit the right centering rod;

[0022] 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 in the original position of the centering auxiliary mold core, so that the mold sleeve fits with the positioning block. Then slide the left centering rod inward so that the raw material ball contacts both centering rods.

[0023] e. Install the upper mold core and press down the raw material ball;

[0024] f. Slide the two centering rods outward to move them out.

[0025] Beneficial effects: This invention discloses a centering device and method for aspherical molded lenses, which has the following beneficial effects compared with the prior art:

[0026] 1. The centering device of the present invention is designed with 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 that of the mold sleeve, and the outer diameter of the column is set to be the same as that of the raw material ball. The base is positioned by a positioning block, and the column is positioned by a centering rod that can slide on the guide rail. This abandons the traditional centering device structure of drilling holes at the bottom of the auxiliary mold core. It can realize the installation of the upper mold core first and then the removal of the centering rod, thereby effectively avoiding the problem of raw material ball displacement caused by removing the centering device first in the prior art, effectively improving the centering accuracy and avoiding the occurrence of uneven filling.

[0027] 2. The centering device of the present invention provides a stop block with a locking mechanism between the slider and the centering auxiliary mold core. When the centering rod slides to the position of contacting the column, the locking mechanism on the stop block can limit the centering rod, which can accurately record the position of the column so as to perform more precise centering of the raw material ball in the future.

[0028] 3. The centering device of the present invention has a V-shaped or arc-shaped surface at one end of the positioning block, which is adapted to the shape of the base of the centering auxiliary mold core; and an arc-shaped surface at one end of the centering rod, which is adapted to the cylindrical shape of the centering auxiliary mold core. This allows the base and the positioning block to fit more closely, and the cylindrical body and the centering rod to fit more closely, effectively improving the centering accuracy.

[0029] 4. The centering device of the present invention provides a U-shaped long groove on the fixed seat and provides several screw holes on the detachment platform at the bottom of the U-shaped long groove, so that the fixed seat and the guide rail can be translated along the direction of the U-shaped long groove, which facilitates fine adjustment of the position of the guide rail.

[0030] 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 the raw material ball shifting caused by removing the centering device first in the prior art, effectively improve the centering accuracy, and avoid the occurrence of uneven material. Attached Figure Description

[0031] Figure 1 This is a structural diagram of a mold with a deep and distinct aspherical surface in the lower mold core, as described in the prior art.

[0032] Figure 2 This is a mold structure diagram for a mold core in the prior art where the aspherical surface of the lower mold core is shallow and the aspherical shape features are not obvious.

[0033] Figure 3 This is a perspective view of the centering device in a specific embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of the centering device in a specific embodiment of the present invention;

[0035] Figure 5 This is a top view of the centering device in a specific embodiment of the present invention;

[0036] Figure 6 This is a structural diagram of the detachment platform in a specific embodiment of the present invention;

[0037] Figure 7 This is a structural diagram of the fixing base in a specific embodiment of the present invention. Detailed Implementation

[0038] In the molding process of a one-piece molded lens, for cases where the aspherical surface of the lower mold core is deep and has obvious aspherical shape characteristics, such as... Figure 1 As shown, the raw material ball easily rolls automatically onto the center of the aspherical concave surface of the lower mold core, in which case there is no need to center the raw material ball. However, for cases where the aspherical surface of the lower mold core is shallow and the aspherical shape characteristics are not obvious, such as... Figure 2 As shown, the raw material ball cannot roll completely into the center of the lower mold core by its own weight. If this happens and the lens is molded, the outer diameter of the finished lens will be uneven, that is, it will be too thick, which will directly affect the performance of the lens.

[0039] To improve the centering accuracy of the raw material spheres and solve the problem of unevenness, this specific embodiment discloses a centering device for aspherical molded lenses. For example... Figure 3-5 As shown, the centering device includes a detachment platform 1. (As indicated...) Figure 6 As shown, the center of the detachment platform 1 has an air intake hole 12, and three screw holes 11 are provided around it. Figure 3 As shown, the release table 1 is provided with a centering auxiliary mold core 2, which includes a base 21 with the same outer diameter as the sleeve 83 to be centered and a column 22 with the same outer diameter as the raw material ball 85 to be centered. The release table 1 is also provided with a fixing seat 5 and a positioning block 3 for positioning the base 21.

[0040] like Figure 7 As shown, the fixing base 5 includes a fixing part 52, one end of which is provided with several positioning holes 53, and the other end is provided with a U-shaped elongated groove 51. Figure 6 As shown, the detachment platform 1 at the bottom of the U-shaped long groove 51 is provided with several screw holes. Figure 3 As shown, the guide rail 4 is provided with several guide rail positioning holes 41. 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 fixed base 5, which facilitates the installation of the guide rail 4 on the fixed base 5. Figure 3-4 As shown, the fixed base 5 is provided with a guide rail 4, the guide rail 4 is provided with a slider 42, the slider 42 is provided with a fixing block 6, and the fixing block 6 is fixed with a centering rod 7, which passes through a hole 61 on the side wall of the fixing block 6. Alternatively, the centering rod 7 can be directly set on the guide rail 4. One end of the centering rod 7 is provided with an arc-shaped surface, which is adapted to the shape of the column 22 of the centering auxiliary mold core 2, so as to facilitate the positioning of the column 22.

[0041] like Figure 3-5As shown, the guide rail 4 is also equipped with a sliding stop 43, which is located between the slider 42 and the centering auxiliary mold core 2. The stop 43 is equipped with a locking mechanism. Common locking mechanisms can be screw holes and screws. In this way, when the centering rod 7 slides to the position of contacting the column 22, the locking mechanism on the stop 43 can be used to limit the centering rod 7, which can accurately record the position of the column 22, so as to perform more precise centering of the raw material ball 85 in the future.

[0042] 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 shape. This surface is adapted to the shape of the base 21 of the centering auxiliary mold core 2, facilitating the positioning of the base 21. The other end of the positioning block 3 has a U-shaped groove 34 to avoid the screw holes on the release platform 1. The positioning block 3 has a central positioning hole 33 in the middle, a left positioning hole 31 on the left, and a right positioning hole 32 on the right, which allows the positioning block 3 to be positioned more accurately.

[0043] To improve 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 located on the left side of the centering auxiliary mold core 2, and the other set of guide rails 4 and centering rods 7 is located on the right side of the centering auxiliary mold core 2, such as... Figure 3-4 As shown. The positioning block 3 is located on the upper side of the centering auxiliary 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 with them.

[0044] Molds awaiting finalization, such as Figure 4 As shown, it includes an upper mold core 81 and a lower mold core 82 disposed within the mold sleeve 83, and a raw material ball 85 disposed between the two mold cores. In addition, it may also include a mold ring 84 to control the overflow of the lens outer diameter.

[0045] For cases 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:

[0046] a. Move the centering auxiliary mold core 2 on the movable release table 1 so that its base 21 fits into the positioning block 3;

[0047] b. Slide the centering rod 7 so that one end of it contacts the cylinder 22 of the centering auxiliary mold core 2;

[0048] c. Remove the centering auxiliary mold core 2, and place the assembled mold sleeve 83, lower mold core 82, and raw material ball 85 in the original position of the centering auxiliary mold core 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.

[0049] d. Install the upper mold core 81 to press down the raw material ball 85;

[0050] e. Slide the centering rod 7 outward to move it out.

[0051] For cases where there are two sets 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:

[0052] a. Move the centering auxiliary mold core 2 on the movable release table 1 so that its base 21 fits into the positioning block 3;

[0053] 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 core 2;

[0054] c. Slide the right stop block 43 to the position where it contacts the right slider 42, lock the locking mechanism in the right stop block 43, and limit the right centering rod 7;

[0055] d. Slide the left centering rod 7 outward, remove the centering auxiliary mold core 2, and place the assembled mold sleeve 83, lower mold core 82, and raw material ball 85 in the original position of the centering auxiliary mold core 2, so that the mold sleeve 83 fits with the positioning block 3. Then slide the left centering rod 7 inward so that the raw material ball 85 contacts both centering rods 7.

[0056] e. Install the upper mold core 81 to press down the raw material ball 85;

[0057] f. Slide the two centering rods 7 outwards to move them out.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A centering device for an aspherical molded lens, characterized in that: The system includes a release platform (1), on which a centering auxiliary mold core (2) is provided. The centering auxiliary mold core (2) includes a base (21) with an outer diameter identical to that of the sleeve (83) to be centered, and a cylinder (22) with an outer diameter identical to that of the raw material ball (85) to be centered. The release platform (1) is also provided with a fixed seat (5) and a positioning block (3) for positioning the base (21). The fixed seat (5) is provided with a guide rail (4), and the guide rail (4) is provided with a sliding centering rod (7). The centering rod (7) can slide during the sliding process. Contact with the column (22); the centering auxiliary mold core (2) is located at the center position on the release platform (1), and there are two sets of guide rails (4) and centering rods (7). One set of guide rails (4) and centering rods (7) is located on the left side of the centering auxiliary mold core (2), and the other set of guide rails (4) and centering rods (7) is located on the right side of the centering auxiliary mold core (2). The positioning block (3) is located on the upper side of the centering auxiliary mold core (2); one end of the centering rod (7) is provided with an arc-shaped surface, which is adapted to the shape of the column (22) of the centering auxiliary mold core (2).

2. The centering device for aspherical molded lenses according to claim 1, characterized in that: The guide rail (4) is provided with a slider (42), the slider (42) is provided with a fixing block (6), and the centering rod (7) is fixed on the fixing block (6).

3. The centering device for aspherical molded lenses according to claim 2, characterized in that: The guide rail (4) is provided with a sliding stop (43), which is located between the slider (42) and the centering auxiliary mold core (2). The stop (43) is provided with a locking mechanism.

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

5. The centering device for aspherical molded lenses according to claim 4, characterized in that: The other end of the positioning block (3) has a U-shaped groove (34), the middle of the positioning block (3) has a middle positioning hole (33), the left side has a left positioning hole (31), and the right side has a right positioning hole (32).

6. The centering device for aspherical molded lenses according to claim 1, characterized in that: The fixed base (5) is provided with a U-shaped long groove (51), and the detachment platform (1) at the bottom of the U-shaped long groove (51) is provided with several screw holes.

7. A centering method using the centering device for aspherical molded lenses as described in claim 3, characterized in that: Includes the following steps: a. Move the centering auxiliary mold core (2) on the moving release table (1) so that its base (21) fits into 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 core (2); c. Slide the right stop (43) to the position where it contacts the right slider (42), lock the locking mechanism in the right stop (43), and limit the right centering rod (7); d. Slide the left centering rod (7) outward, remove the centering auxiliary mold core (2), and place the assembled mold sleeve (83), lower mold core (82), and raw material ball (85) in the original position of the centering auxiliary mold core (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) contacts both centering rods (7); e. Install the upper mold core (81) and press down the raw material ball (85). f. Slide the two centering rods (7) outward to move the two centering rods (7) out.

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