CN112034543A - Compression molding method for infrared diffraction surface optical element - Google Patents
Compression molding method for infrared diffraction surface optical element Download PDFInfo
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- CN112034543A CN112034543A CN202010902957.0A CN202010902957A CN112034543A CN 112034543 A CN112034543 A CN 112034543A CN 202010902957 A CN202010902957 A CN 202010902957A CN 112034543 A CN112034543 A CN 112034543A
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Abstract
The invention discloses a compression molding method of an infrared diffraction surface optical element, and belongs to the technical field of compression molding of optical elements. The single-point diamond turning machine mainly solves the problems that the traditional single-point diamond turning machining is low in machining efficiency, large in turning tool loss and not suitable for batch production. The method is mainly characterized by comprising the following steps: (1) adopting a die with the same shape as the optical element of the infrared diffraction surface; (2) manufacturing an infrared glass substrate which is made of the same material as the infrared diffraction surface optical element; (3) manufacturing a low-temperature material surface layer lower than the softening temperature of the infrared diffraction surface optical element; (4) and putting the infrared glass substrate and the upper and lower low-temperature material surface layers into a mould of a mould press, heating and pressurizing, and deforming the infrared glass substrate and the low-temperature material surface layers to obtain the infrared diffraction surface optical element. The invention has the characteristics of high production efficiency, less equipment investment and suitability for batch production of various infrared diffraction surface optical elements, and is mainly used for batch production of various infrared diffraction surface optical elements.
Description
Technical Field
The invention belongs to the technical field of compression molding of optical elements. The method comprises the steps of putting a low-temperature material and an infrared substrate glass material into a mould pressing die, heating and pressurizing to press the infrared diffraction surface optical element, and is suitable for batch production of the diffraction surface optical element.
Background
In recent years, with rapid development in the fields of infrared security and monitoring, the infrared diffractive surface optical element is favored by optical designers under the condition that the market demands for lighter and smaller products.
The traditional infrared diffraction surface optical element is produced by turning with a single-point diamond lathe, so that the processing efficiency is low, the loss of a turning tool is large, the turning tool is not suitable for batch production, and the investment of equipment required by mass production is large.
Disclosure of Invention
The invention aims to provide a compression molding method of an infrared diffraction surface optical element aiming at the defects, which can realize the compression molding production of the optical glass diffraction surface optical element by simultaneously molding the surface layer of a low-temperature material and an infrared glass substrate.
The technical solution of the invention is as follows: a compression molding method of an infrared diffraction surface optical element is characterized by comprising the following steps:
(1) adopting a die with the same shape as the optical element of the infrared diffraction surface;
(2) manufacturing an infrared glass substrate which has the same diameter and material as the infrared diffraction surface optical element;
(3) manufacturing a low-temperature material surface layer which has the same diameter with the infrared diffraction surface optical element and is lower than the softening temperature of the infrared diffraction surface optical element;
(4) and putting the infrared glass substrate and the upper and lower low-temperature material surface layers into a mould of a mould press, heating and pressurizing, and deforming the infrared glass substrate and the low-temperature material surface layers to obtain the infrared diffraction surface optical element.
In the step (3) of the technical solution of the present invention, the surface layer of the low temperature material is made of an infrared transmitting material.
In the step (3) of the technical solution of the present invention, the infrared transmitting material is a resin material.
In the step (2) of the technical solution of the present invention, the infrared glass substrate is infrared optical glass or infrared crystal.
In the step (1) of the technical solution of the present invention, the mold is made of aluminum or copper.
In the step (1) of the technical solution of the present invention, the material of the mold is cemented carbide or ceramic material.
In the step (3) of the technical solution of the present invention, the softening temperature of the surface layer of the low-temperature material is 100 ℃ or higher lower than the softening temperature of the infrared diffraction surface optical element.
In the step (4) of the technical scheme, the temperature is increased to enable the temperature of the molding press to be 5-20 ℃ above the softening temperature of the surface layer of the low-temperature material, and the temperature is kept for 1-10 minutes; the pressurization is to apply a pressure of 100 to 200kgf to the mold.
In the steps (1), (2) and (3) of the technical solution of the present invention, the edges of the low temperature material surface layer and the infrared glass substrate are cylindrical, the contact surface between the low temperature material surface layer and the infrared glass substrate is a plane or a curved surface with the same curvature radius, and the contact surface between the low temperature material surface layer and the mold is spherical or near-spherical.
In the technical scheme of the invention, in the step (3), the thickness of the surface layer of the low-temperature material is 0.05-0.2 mm in a cylindrical shape.
The invention adopts a compression molding method of the infrared diffraction surface optical element, which comprises the following steps: (1) the method comprises the steps of (1) adopting a mold with the same shape as an infrared diffraction surface optical element, (2) manufacturing an infrared glass substrate with the same diameter as the infrared diffraction surface optical element and the same material as the infrared diffraction surface optical element, (3) manufacturing a low-temperature material surface layer with the same diameter as the infrared diffraction surface optical element and the softening temperature lower than the infrared diffraction surface optical element, (4) putting the infrared glass substrate and the upper and lower low-temperature material surface layers into a mold of a molding press together, heating and pressurizing, and deforming the low-temperature material surface layer and the infrared glass substrate to obtain the infrared diffraction surface optical element, so that the traditional method for machining the infrared diffraction surface optical element by adopting single-point diamond lathe turning is changed, and the defects of low machining efficiency, large turning tool loss, unsuitability for mass production and large equipment investment in mass production existing in the traditional. In addition, because the surface layer of the low-temperature material is adopted, the forming temperature is far lower than the mould pressing production temperature of the infrared glass substrate material, the energy consumption is greatly saved, and the problem that the infrared glass substrate is easy to generate surface defects due to heating is solved.
The invention has the characteristics of high production efficiency, less equipment investment and suitability for batch production of various infrared diffraction surface optical elements.
The invention is mainly used for the batch production of various infrared diffraction surface optical elements.
Drawings
In order to more clearly illustrate the technical solution in the implementation of the present invention, the drawings used in the embodiments will be briefly described below
FIG. 1 is a schematic view of a compression molding method of an infrared diffraction surface optical element according to the present invention.
In the figure: 1. a low temperature material surface layer; 2. an infrared glass substrate; 3. and (5) molding.
Detailed Description
As shown in fig. 1, one embodiment of a compression molding method for an infrared diffraction surface optical element of the present invention includes the steps of:
(1) a mould 3 with the same shape as the optical element of the infrared diffraction surface is adopted;
(2) the infrared glass substrate 2 which has the same diameter and material as the infrared diffraction surface optical element is manufactured, so that the optical characteristics of the product can be kept;
(3) manufacturing a low-temperature material surface layer 1 which has the same diameter as the infrared diffraction surface optical element and is lower than the softening temperature of the infrared diffraction surface optical element;
(4) and putting the processed infrared glass substrate 2 and the upper and lower low-temperature material surface layers 1 into a mould 3 of a precision mould press, heating and pressurizing, and deforming the infrared glass substrate 2 and the low-temperature material surface layers 1 to obtain the infrared diffraction surface optical element.
In the step (1), the die 3 is made of a soft metal material such as aluminum or copper, which is easy to be turned, or a hard alloy or a ceramic material. From the processing cost, the mold of the Al and Cu materials has low processing difficulty and low overall processing cost, and is the optimal selection of the mold material of the method.
In the step (2), the infrared glass substrate 2 is infrared optical glass or infrared crystal which is the same as the infrared diffraction surface optical element material, and the optical performance of the die pressing diffraction surface optical element is guaranteed to be unchanged. In view of mass production, the edge of the infrared glass substrate 2 is cylindrical. The center thickness of the infrared glass substrate 2 is determined according to the thickness of the infrared diffraction surface optical element.
And (3) selecting an infrared transmitting material on the surface layer 1 of the low-temperature material according to the shape of the infrared diffraction surface optical element, wherein the infrared transmitting material is optimally selected from resin materials, and the resin materials are low in cost, easy to process and produce and optimally selected mainly from the aspects of production cost and manufacturing difficulty. The softening temperature of the surface layer 1 of the low-temperature material is lower than the softening temperature of the infrared diffraction surface optical element by more than 100 ℃. The surface layer 1 of the low-temperature material is in a cylindrical shape with the thickness of 0.05-0.2 mm. In view of mass production, the edge of the surface layer 1 of the low-temperature material is cylindrical. The contact surface between the low-temperature material surface layer 1 and the infrared glass substrate 2 is a plane or a curved surface with the same curvature radius, so that the two materials are completely attached to each other. The contact surface between the low-temperature material surface layer 1 and the mould 3 is spherical or nearly spherical.
In the step (4), the temperature of the molding press is raised to 5-20 ℃ above the softening temperature of the surface layer 1 of the low-temperature material, and the temperature is kept for 1-10 minutes; and pressurizing, namely applying 100-200 kgf of pressure to the mold 3, so that the low-temperature material surface layer 1 deforms and is bonded with the surface of the infrared glass substrate 2 to form a whole, and the low-temperature material surface layer 1 copies the surface form of the mold 3 to obtain the infrared diffraction surface optical element. The combined shape of the low-temperature material surface layer 1 and the infrared glass substrate 2 is similar to the shape of a diffraction surface optical element.
Example 1:
molding chalcogenide diffractive surface optical elements. The chalcogenide infrared glass material is soft, the components volatilize under the high-temperature condition, and the compression molding material volatilizes to generate poor appearance. The diffraction surface optical element made of the biconvex chalcogenide IRG206 material with the diameter of 10mm and the central thickness of 5mm is prepared in the embodiment 1 of the invention. Firstly, two columnar low-temperature material surface layers 1 with the thickness of 0.1mm and the diameter of 10mm are prepared, the low-temperature material surface layers 1 are made of resin materials, then a biconvex IRG206 infrared glass substrate 2 with the center thickness of 4.9mm is processed, the two low-temperature material surface layers 1 are respectively arranged above and below the IR206 infrared glass substrate 2 and are placed into a mold 3, the mold 3 is made of a Cu material, the temperature is raised to be 5-10 ℃ above the softening temperature of the low-temperature material, then the pressure of 100kgf is applied, and finally the needed diffraction surface optical element is obtained.
Example 2:
molding of the germanium diffractive surface optical element. In the embodiment 2 of the invention, the germanium material diffraction surface optical element with the diameter of 20mm, the central thickness of 8mm and the convex-concave shape is prepared. Firstly, two columnar low-temperature material surface layers 1 with the thickness of 0.1mm and the diameter of 20mm are prepared, the low-temperature material surface layers 1 are made of resin materials, a plano-convex germanium infrared glass substrate 2 with the central thickness of 7.9mm is processed, the two low-temperature material surface layers 1 are respectively arranged above and below the germanium infrared glass substrate 2 and are placed into a mold, the mold 3 is made of an Al material, the temperature is raised to the softening temperature of the low-temperature material by 10-20 ℃, then the pressure of 200kgf is applied, and finally the needed diffraction surface optical element is obtained.
Claims (10)
1. A compression molding method of an infrared diffraction surface optical element is characterized by comprising the following steps:
(1) a mould (3) with the same shape as the optical element of the infrared diffraction surface is adopted;
(2) manufacturing an infrared glass substrate (2) which has the same diameter and material as the infrared diffraction surface optical element;
(3) manufacturing a low-temperature material surface layer (1) which has the same diameter with the infrared diffraction surface optical element and is lower than the softening temperature of the infrared diffraction surface optical element;
(4) putting the infrared glass substrate (2) and the upper and lower low-temperature material surface layers (1) into a mould (3) of a mould press, heating and pressurizing, and deforming the low-temperature material surface layer (1) and the infrared glass substrate (2) to obtain the infrared diffraction surface optical element.
2. A press molding method of an infrared diffraction surface optical element as claimed in claim 1, wherein: in the step (3), the low-temperature material surface layer (1) is made of an infrared-transmitting material.
3. A press molding method of an infrared diffraction surface optical element as claimed in claim 2, wherein: in the step (3), the infrared-transmitting material is a resin material.
4. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (2), the infrared glass substrate (2) is infrared optical glass or infrared crystal.
5. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (1), the material of the die (3) is aluminum or copper.
6. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (1), the die (3) is made of hard alloy or ceramic material.
7. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (3), the softening temperature of the low-temperature material surface layer (1) is lower than the softening temperature of the infrared diffraction surface optical element by more than 100 ℃.
8. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (4), the temperature of the mould pressing machine is raised to 5-20 ℃ above the softening temperature of the surface layer (1) of the low-temperature material, and the temperature is kept for 1-10 minutes; the pressurization is to apply a pressure of 100 to 200kgf to the mold (3).
9. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the steps (1), (2) and (3), the edges of the low-temperature material surface layer (1) and the infrared glass substrate (2) are cylindrical, the contact surface between the low-temperature material surface layer (1) and the infrared glass substrate (2) is a plane or a curved surface with the same curvature radius, and the contact surface between the low-temperature material surface layer (1) and the mold (3) is spherical or near-spherical.
10. A press molding method for an infrared diffractive surface optical element according to claim 1, 2 or 3, characterized in that: in the step (3), the thickness of the low-temperature material surface layer (1) is 0.05-0.2 mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5436764A (en) * | 1992-04-21 | 1995-07-25 | Matsushita Electric Industrial Co., Ltd. | Die for forming a micro-optical element, manufacturing method therefor, micro-optical element and manufacturing method therefor |
| TW457190B (en) * | 2000-06-14 | 2001-10-01 | Prodisc Technology Inc | Manufacturing method of optical element |
| WO2007026597A1 (en) * | 2005-08-29 | 2007-03-08 | Matsushita Electric Industrial Co., Ltd. | Diffractive optical element and method for manufacturing same, and imaging apparatus using such diffractive optical element |
| CN103189192A (en) * | 2010-11-09 | 2013-07-03 | 佳能株式会社 | Method of producing composite optical element |
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- 2020-09-01 CN CN202010902957.0A patent/CN112034543B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5436764A (en) * | 1992-04-21 | 1995-07-25 | Matsushita Electric Industrial Co., Ltd. | Die for forming a micro-optical element, manufacturing method therefor, micro-optical element and manufacturing method therefor |
| TW457190B (en) * | 2000-06-14 | 2001-10-01 | Prodisc Technology Inc | Manufacturing method of optical element |
| WO2007026597A1 (en) * | 2005-08-29 | 2007-03-08 | Matsushita Electric Industrial Co., Ltd. | Diffractive optical element and method for manufacturing same, and imaging apparatus using such diffractive optical element |
| CN103189192A (en) * | 2010-11-09 | 2013-07-03 | 佳能株式会社 | Method of producing composite optical element |
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