JP7180898B2 - Optical lens, optical lens mold and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to an optical lens, an optical lens molding die, and a manufacturing method thereof.

Optical fiber communication has advantages such as good transmission efficiency, resistance to electromagnetic interference, and high stability. Optical fibers can be divided into single-mode optical fibers and multi-mode optical fibers according to transmission methods. Here, since the diameter of the multimode optical fiber is much larger than the wavelength of the luminous flux, luminous fluxes of different wavelengths and phases can be continuously reflected and transmitted along the peripheral wall of the optical fiber. When transmitted over a long distance, there will be a difference in transmission speed between different modes, causing the problems of modal dispersion and too high luminous flux in the center of the optical fiber, limiting the transmission distance.

To solve the above problems, a helical phase plate is generally used to transform the passing light beam into a spiral light beam, avoiding the light intensity being concentrated in the central portion of the optical fiber. However, the spiral phase plate is difficult to manufacture, and the conventional optical communication module requires assembling a plurality of optical elements to complete the arrangement of the optical path. It greatly affects the transmission path, is difficult to align accurately, is difficult to process, has uneven quality, and has poor transmission effect.

Therefore, in order to solve the above problems, it is necessary to provide a novel and inventive optical lens, an optical lens molding die and a manufacturing method thereof.

SUMMARY OF THE INVENTION The main object of the present invention is to provide an optical lens, an optical lens molding die, and a method for manufacturing the same, which has a simple structure, a simple manufacturing process, a uniform distribution of light flux, high processing accuracy, and is useful for miniaturization. That is.

To achieve the above objects, the present invention provides an optical lens, comprising a helical surface extending helically around an axial direction and an intermediate structure encircled by the helical surface, the intermediate structure comprising the helical Extending axially to one side with respect to the plane, the helical plane is wound to form a step.

In order to achieve the above objects, the present invention further provides a molding die for manufacturing the above optical lens, comprising a helical surface extending helically around an axial direction and a mold encircled by the helical surface. The intermediate structure of the molding die extends axially to one side with respect to the helical surface of the molding die, and the helical surface of the molding die goes around to form a step. , the helical surface, the intermediate structure and the step of the mold are relatively complementary to the helical surface, the intermediate structure and the step of the optical lens respectively.

In order to achieve the above objects, the present invention further provides a manufacturing method for manufacturing the molding die as described above, comprising the steps of providing a substrate including a working surface; forming the helical surface of the mold, the intermediate structure and the steps.

1 is a perspective view of a molding die of a preferred embodiment of the present invention; FIG. 1 is a partially enlarged view of a molding die of a preferred embodiment of the present invention; FIG. 1 is a schematic diagram of a cutter according to a preferred embodiment of the present invention; FIG. FIG. 4 is a partially enlarged view of the cutter of the preferred embodiment of the present invention; FIG. 4 is a schematic diagram of manufacturing the molding die according to a preferred embodiment of the present invention; 1 is a schematic diagram of an optical lens according to a preferred embodiment of the present invention; FIG. FIG. 2 is a partially enlarged view of an optical lens of a preferred embodiment of the present invention; FIG. 4 is a schematic diagram of the vortex effect of uniform distribution of the light flux produced by the optical lens of the preferred embodiment of the present invention;

In the following, possible embodiments of the present invention will be described with the help of examples, which are not intended to limit the scope of protection of the present invention in advance.

1 to 5 show a molding die 2 for manufacturing an optical lens as follows in a preferred embodiment of the invention. The molding die 2 includes a helical surface 22 spirally extending around an axial direction 21 and an intermediate structure 23 encircled by the helical surface 22 , the intermediate structure 23 of the molding die 2 The spiral surface 22 of the molding die 2 extends axially to one side with respect to the spiral surface 22 of the mold 2, and the spiral surface 22 of the molding die 2 is wound to form a step 24. As shown in FIG.

In this embodiment, the intermediate structure 23 of the molding die 2 is a boss, and the diameter of the end surface of the boss is 0.001 mm or more and 0.02 mm or less. A circular arc guide surface 25 is provided between the intermediate structure 23 of the mold 2 and the spiral surface 22 of the mold 2, and the arc radius of the arc guide surface 25 of the mold 2 is 0.001 mm or more. 0.02 mm or less. The step 24 of the molding die 2 is 5 μm or more and 20 μm or less.
The intermediate structure 23 of the molding die 2 includes a peripheral wall 231 , and the peripheral wall 231 of the molding die 2 has an inclination angle θ4 of 1 degree or more and 20 degrees or less with respect to the axial direction 21 of the molding die 2 . A reference plane P2 perpendicular to the axial direction 21 of the molding die 2 is defined, a tangential direction T3 of the outer edge of the arc guide surface 25 of the molding die 2 defines a first included angle θ5 with the reference plane P2, and A tangential direction T4 of the outer edge of the spiral surface 22 of the mold 2 defines a second included angle θ6 with the reference plane P2. The first included angle θ5 of the molding die 2 is larger than the second included angle θ6 of the molding die 2, the first included angle θ5 of the molding die 2 is 17.0 degrees or more, and the molding die 2 is greater than or equal to 0.70 degrees, preferably said first included angle .theta.5 is about 17.2 degrees and said second included angle .theta.6 is about 0.72 degrees.

6-7 show the optical lens 1 of the preferred embodiment of the invention. The optical lens 1 includes a helical surface 12 extending helically around an axial direction 11 and an intermediate structure 13 encircled by the helical surface 12 , the intermediate structure 13 being on one side of the helical surface 12 . Extending in the axial direction, the helical surface 12 is wound to form a step 14 . Here, the helical surface 22, intermediate structure 23 and step 24 of the mold 2 are relatively complementary to the helical surface 12, intermediate structure 13 and step 14 of the optical lens 1 respectively.

In this embodiment, the intermediate structure 13 is a hole (blind hole or through hole), and the diameter of the hole bottom edge of the hole is 0.001 mm or more and 0.02 mm or less. A circular guide surface 15 is provided between the intermediate structure 13 and the spiral surface 12, and the circular arc radius of the circular guide surface 15 is 0.001 mm or more and 0.02 mm or less. The step 14 is 5 microns (μm) or more and 20 μm or less. The intermediate structure 13 includes a peripheral wall 131 that forms an inclination angle θ1 of 1 degree or more and 20 degrees or less with respect to the axial direction 11 of the optical lens 1 .
A reference plane P1 perpendicular to the axial direction 11 of the optical lens 1 is defined, a tangential direction T1 of the outer edge of the arcuate guide surface 15 defines a first included angle A tangential direction T2 defines a second included angle θ3 with the reference plane P1, wherein the first included angle θ2 is greater than the second included angle θ3, the first included angle θ2 is 17.0 degrees or more, and the second included angle θ3 is greater than or equal to 0.70 degrees, preferably the first included angle θ2 is about 17.2 degrees and the second included angle θ3 is about 0.72 degrees.

The optical lens 1 is structurally complementary to the mold 2 . For example, the intermediate structure 13 of the optical lens 1 is a hole, the intermediate structure 23 of the mold 2 is a boss, and as is understood, if the intermediate structure 13 of the optical lens 1 is a boss, the The intermediate structures 23 of the molding die 2 are holes.

Please refer to FIGS. The present invention further provides a manufacturing method for manufacturing the molding die 2 as described above, comprising the steps of: providing a substrate 3 including a working surface 31; , forming the intermediate structure 23 and the step 24 . If desired, multiple mold cavities can be formed in the substrate 3 for manufacturing multiple optical lenses at one time. Preferably, the gap between any two adjacent molding cavities is 0.01 mm or less, so that the spiral beams of each manufactured optical lens do not interfere.

In this embodiment, the cutter 4 cuts the processing surface 31 to form the spiral surface 22, the intermediate structure 23 and the steps 24 of the molding die 2, and the cutter 4 cuts the opposing cutting paths S in the base 3. extends spirally around the axial direction 32 of the base body 3 . During cutting, the cutter 4 may be fixed and the base 3 may be rotated, or the base 3 may be fixed and the cutter 4 may be rotated, or the cutter 4 and the base 3 may be rotated at the same time. good. The point is that the machined surface 31 can be cut along a preset cutting path S. Specifically, each cutting path S of the cutter 4 circulates from a relatively high position on the base 3 in the axial direction of the base 3 from shallow to deep, and further from a relatively low position on the base 3 . 3 extends back to a relatively high position.
The cutter 4 spirally cuts the processing surface 31 from outside to inside (or from inside to outside) around the axial direction of the base 3 . Here, a cutter 4 with different arc angles 41, 42 on opposite sides of the cutter blade is selected, and the cutter blade of the cutter 4 is arranged with one side facing inward with a relatively smaller arc angle 41. The machining surface 31 is cut by a method. Preferably, the arc angles 41, 42 on both sides of the cutter edge of the selected cutter 4 each have an arc angle radius less than or equal to 1 μm and an arc angle radius greater than 1 μm and less than or equal to 5 μm.

It should be noted that the dimensional conditions for each of the above structures are advantageous for uniform dispersion of the vortex of the luminous flux, and the mold for molding the optical lens must be processed with optimum precision (for example, using a diamond cutter). ), the mold is easy to process and manufacture, and the die-cutting is smooth (due to the tilt angle). In the embodiment in which the mold for molding the optical lens is processed by a diamond cutter, considering that there is a processing limit when processing to a position close to the center of the mold, the center of the mold of the diamond cutter is The side closer to the edge is configured to have a smaller arc angle radius of the cutter blade than the opposite side, so that the natural arc angle radius due to machining can be reduced to 1 μm or less, which contributes to machining accuracy and miniaturization of products. Advantageous. The holes in the mold are formed by, for example, laser processing, but may be formed by other processing methods.

FIG. 8 shows the swirl effect of uniform dispersion of the light flux produced by the optical lens of the present invention. As can be seen from FIG. 8, the action of the spiral surface of the optical lens causes the rays to be helically and uniformly dispersed, and the action of the intermediate structures (such as holes or bosses) of the optical lens causes the rays to be evenly dispersed. It surrounds the intermediate structure to avoid the luminous flux from being too concentrated in the central part, effectively solving the problem of modal dispersion and the luminous flux in the center of the optical fiber being too high to limit the transmission distance. Here, different optical effects can be obtained by combining different numerical values of conditions such as the diameter of the spiral lens, the angle of the spiral surface, the size of the intermediate structure, the size of the step, and the like.

REFERENCE SIGNS LIST 1 optical lens 2 molding die 3 substrate 4 cutter 11, 21 axial direction 12, 22 spiral surface 13, 23 intermediate structure 131, 231 peripheral wall 14, 24 step 15, 25 arc guide surface 31 processing surface 32 axial direction 41, 42 arc Angle P1 Reference plane P2 Reference plane S Cutting path T1, T2, T3, T4 Tangential direction θ1, θ4 Tilt angle θ2, θ5 First included angle θ3, θ6 Second included angle

Claims (13)

an optical lens,
a helical surface extending helically around an axial direction and an intermediate structure encircled by the helical surface;
the intermediate structure extends axially to one side with respect to the helical plane;
A step is formed around the spiral surface,
A circular arc guide surface is provided between the intermediate structure and the spiral surface, and the arc radius of the arc guide surface from the intermediate structure to the spiral surface is 0.001 mm or more and 0.02 mm or less,
the intermediate structure includes a peripheral wall, the peripheral wall having an inclination angle of 1 degree or more and 20 degrees or less with respect to the axial direction of the optical lens;
said intermediate structure is a hole;
The diameter of the hole bottom edge of the hole is 0.001 mm or more and 0.02 mm or less .
optical lens. 2. The optical lens according to claim 1, wherein the step is 5 microns ([mu]m) or more and 20 [mu]m or less. defining a reference plane perpendicular to the axial direction of the optical lens, a tangential direction of the outer edge of the arc guiding surface defining a first included angle with the reference plane, and a tangential direction of the outer edge of the spiral surface being the reference plane and a first included angle; 2. The optical lens of claim 1, defining two included angles, said first included angle being greater than said second included angle. 4. The optical lens of claim 3 , wherein the first included angle is 17.0 degrees or more and the second included angle is 0.70 degrees or more. A molding die for manufacturing the optical lens according to any one of claims 1 to 4 ,
a helical surface extending helically around an axial direction and an intermediate structure encircled by the helical surface;
the intermediate structure of the mold extends axially to one side with respect to the helical surface of the mold;
The helical surface of the molding die is circulated to form a step,
the helical surface, intermediate structure and steps of the mold are relatively complementary to the helical surface, intermediate structure and steps of the optical lens, respectively;
The intermediate structure of the molding die includes a peripheral wall, and the peripheral wall of the molding die has an inclination angle of 1 degree or more and 20 degrees or less with respect to the axial direction of the molding die,
the intermediate structure of the molding die is a boss,
The diameter of the end surface of the boss is 0.001 mm or more and 0.02 mm or less .
molding die. An arc guide surface is provided between the intermediate structure of the molding die and the spiral surface of the molding die, and the arc radius of the arc guide surface from the intermediate structure of the molding die to the spiral surface is 0.5. 6. The molding die according to claim 5 , which is 001 mm or more and 0.02 mm or less. The molding die according to claim 5 , wherein the step of the molding die is 5 µm or more and 20 µm or less. defining a reference plane perpendicular to the axial direction of the molding die, a tangential direction of the outer edge of the arc guide surface of the molding die defining a first included angle with the reference plane, and the outer edge of the spiral surface of the molding die defines a second included angle with the reference plane, the first included angle of the mold being greater than the second included angle of the mold. The molding die according to claim 8 , wherein the first included angle of the molding die is 17.0 degrees or more, and the second included angle of the molding die is 0.70 degrees or more. A manufacturing method for manufacturing the molding die according to claim 5 ,
providing a substrate including a working surface;
forming a spiral surface, an intermediate structure and a step of the mold on the working surface;
cutting the processing surface with a cutter to form a spiral surface, an intermediate structure and a step of the molding die;
the arc angles on both sides of the cutter blade of the selected cutter each have an arc angle radius of 1 μm or less and an arc angle radius of greater than 1 μm and less than or equal to 5 μm;
selecting a cutter with different arc angles on opposite sides of the cutter blade;
The cutter blade of the cutter cuts the machining surface with one side facing inward with a relatively small arc angle.
Production method. 11. The manufacturing method according to claim 10 , wherein the opposing cutting paths in the base extend spirally around the axial direction of the base. 12. The manufacturing method according to claim 11 , wherein each cutting path of the cutter spirally cuts the processing surface from outside to inside around the axial direction of the base. Each cutting path of the cutter circumnavigates from a relatively high position on the base body from shallow to deep in an axial direction of the base body, and then returns from a relatively low position on the base body to a relatively high position on the base body. 12. The method of manufacturing according to claim 11 , wherein the groove extends in a direction of .

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