CN112394432A - Method for processing special-shaped curved surface prism - Google Patents
Method for processing special-shaped curved surface prism Download PDFInfo
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- CN112394432A CN112394432A CN202011247110.XA CN202011247110A CN112394432A CN 112394432 A CN112394432 A CN 112394432A CN 202011247110 A CN202011247110 A CN 202011247110A CN 112394432 A CN112394432 A CN 112394432A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000009434 installation Methods 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 claims description 4
- 238000003754 machining Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000003672 processing method Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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Abstract
The invention discloses a method for processing a special-shaped curved surface prism, which comprises the steps of firstly processing a spherical surface after taking the spherical center of the spherical surface as the origin of a first coordinate system; then, converting the spherical center of the front spherical surface into a second coordinate system according to the included angle between the front spherical surface and the rear spherical surface and the optical axis distance, and processing the front spherical surface by taking the spherical center of the front spherical surface as the origin of the second coordinate system; and then calculating the position of a rotary central shaft of the outline axis according to the size of the optical design clear aperture and the position of an application spherical surface, converting the position into a third coordinate system for outline processing, processing the installation leaning surface of the curved surface prism, and processing the rotary excircle of the curved surface prism by taking the installation leaning surface as a reference and the third coordinate system as a processing coordinate system. The machining datum is unique by one-time installation and coordinate system conversion, and the machining precision is effectively guaranteed. The problems of the structure and the processing of the curved surface prism in the prior art are effectively solved, and various technical indexes of the curved surface prism are guaranteed.
Description
Technical Field
The invention relates to an optical element processing and ultra-precision processing technology, in particular to a method for processing a special-shaped curved surface prism.
Background
In the whole optical design, the space structure is tight, and the traditional curved prism shape generates interference in an optical system, thereby having great difficulty in fixed installation. Therefore, the modern optical design is widely applied to the design of the curved surface prism and the anisotropic curved surface prism, and the corresponding shape structure of the curved surface prism is designed according to the space problem, so that the problems are solved.
In 1911, the curved prism proposed by Ferry.C.H in 1911 based on the Rowland circle principle has two spherical working surfaces, and the two spherical surfaces have larger inclination angles, so that the curved prism has light splitting and imaging capabilities, and when the curved prism is applied to a light splitting element in a spectral system, the curved prism can greatly simplify the structure of the system and reduce the weight of the system. The curved surface prism brings great advantages, and brings great difficulty to processing, and especially has high precision requirements on surface inclination angle and off-axis amount.
The Offer type imaging spectrometer combines imaging and spectrum technologies to obtain a target appearance and a spectrum image, and realizes image spectrum fusion. By comparing images of different wave bands, the identifiability of the target is enhanced, and the method can be widely applied to the fields of ground monitoring, water quality monitoring and biomedicine. The curved prism is a special transmission optical element, the outer profile of which is columnar, the incident surface and the emergent surface of the element are both spherical surfaces, but the rotation symmetry axes of the incident surface and the emergent surface are intersected at a certain angle.
The surface type of the two spherical surfaces is ensured during processing, and then all the structural shapes except the two spherical surfaces are determined according to the used position, the structural space and the structural design scheme.
The method in the prior art is to use a back spherical surface as an axis to make a cylindrical surface for processing and structural installation. The included angle between the spherical surface and the optical axis of some curved surface prisms is very large, the gap between each optical mirror in the optical design is very small, and after the included angle is large, the curved surface prisms can be very large, even the curved surface prisms interfere with other optical mirrors in order to ensure the integrity of the optical design and the stability of the structural design.
In order to meet the requirements of optical design, a new design appearance needs to be designed according to the limitation of space size without influencing the requirements of optical design, so that great difficulty is brought to the processing of the curved surface prism, and various technical indexes of the curved surface prism are difficult to guarantee.
Disclosure of Invention
The invention aims to provide a method for processing a special-shaped curved surface prism.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a processing method of a special-shaped curved surface prism, which is used for processing an opposite hyperboloid prism by converting a cylindrical glass blank into a coordinate system on a processing center, and comprises the following steps:
firstly, taking the sphere center of the later spherical surface as the origin of a first coordinate system, and processing the later spherical surface;
then, converting the front spherical surface into a second coordinate system according to the included angle between the front spherical surface and the rear spherical surface and the optical axis distance, and processing the front spherical surface by taking the spherical center of the front spherical surface as the origin of the second coordinate system;
then, calculating the position of a rotary central shaft of the appearance shaft center according to the size of the optical design clear aperture and the position of an application spherical surface, converting the position into a third coordinate system for appearance processing, and processing the installation leaning surface of the curved surface prism by taking the rotary central shaft of the appearance shaft center as the shaft of the third coordinate system;
and finally, processing the rotary excircle of the curved prism by taking the mounting leaning surface as a reference and taking the third coordinate system as a processing coordinate system.
According to the technical scheme provided by the invention, the method for processing the special-shaped curved surface prism provided by the embodiment of the invention has the advantages that the uniqueness of the processing reference is ensured and the processing precision is effectively ensured by once adding and converting the coordinate system.
Drawings
Fig. 1 is a schematic flow chart of a processing method of a special-shaped curved prism according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The invention relates to a method for processing a special-shaped curved surface prism, which has the preferred specific implementation modes that:
a cylindrical glass rough material is processed into an opposite hyperboloid prism through the transformation of a coordinate system on a processing center, and the processing method comprises the following steps:
firstly, taking the sphere center of the later spherical surface as the origin of a first coordinate system, and processing the later spherical surface;
then, converting the front spherical surface into a second coordinate system according to the included angle between the front spherical surface and the rear spherical surface and the optical axis distance, and processing the front spherical surface by taking the spherical center of the front spherical surface as the origin of the second coordinate system;
then, calculating the position of a rotary central shaft of the appearance shaft center according to the size of the optical design clear aperture and the position of an application spherical surface, converting the position into a third coordinate system for appearance processing, and processing the installation leaning surface of the curved surface prism by taking the rotary central shaft of the appearance shaft center as the shaft of the third coordinate system;
and finally, processing the rotary excircle of the curved prism by taking the mounting leaning surface as a reference and taking the third coordinate system as a processing coordinate system.
The method also comprises a detection step, wherein the surface types of the two spherical surfaces of the curved surface prism are detected firstly, and then all the overall dimensions of the curved surface prism are detected.
The processing method of the special-shaped curved surface prism comprises the steps of processing a piece of special-shaped hyperboloid prism by converting a cylindrical glass blank into a coordinate system on a processing center, taking the spherical center of a later spherical surface as a first coordinate origin, and processing the later spherical surface; then, converting the angle between the front spherical surface and the rear spherical surface and the optical axis distance into a second coordinate system, and processing the front spherical surface; calculating the position of a rotary central shaft of the appearance axis according to the size of the optical design clear aperture and the position of an application spherical surface, converting a processing coordinate system into a third coordinate system for appearance processing, and processing the installation leaning surface of the curved surface prism; and processing the rotating excircle of the curved surface prism by taking the leaning surface as a reference and the third coordinate system as a processing coordinate system. The machining datum is unique by one-time installation and coordinate system conversion, and the machining precision is effectively guaranteed.
The invention effectively solves the problems of the structure and the processing of the curved surface prism in the prior art, and ensures various technical indexes of the curved surface prism.
The specific embodiment is as shown in fig. 1:
firstly, processing a front spherical surface and a rear spherical surface of a curved prism by using a blank according to a sample plate, and ensuring that the two spherical surfaces meet the design requirements;
secondly, the sphere center of the rear spherical surface of the curved surface prism is used as a reference, a virtual optical axis in the optical design is used as a processing center in the design software, and then the eccentric distance of the virtual optical axis is found according to the reference.
Clamping the curved surface prism with the machined spherical surface to a machining center, taking the spherical center of the spherical surface as a machining reference center, converting the simulated eccentric distance to the machining center, keeping more than three decimal points of effective precision, machining the cylindrical surface of the curved surface prism firstly, converting a cutter, and machining a vertical plane with the cylindrical surface;
and finally, detecting the surface types of the two spherical surfaces of the curved surface prism, and then detecting the overall dimensions of the curved surface prism.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A method for processing a special-shaped curved prism is characterized in that a cylindrical glass blank is converted into an opposite hyperboloid prism through a coordinate system on a processing center, and comprises the following steps:
firstly, taking the sphere center of the later spherical surface as the origin of a first coordinate system, and processing the later spherical surface;
then, converting the front spherical surface into a second coordinate system according to the included angle between the front spherical surface and the rear spherical surface and the optical axis distance, and processing the front spherical surface by taking the spherical center of the front spherical surface as the origin of the second coordinate system;
then, calculating the position of a rotary central shaft of the appearance shaft center according to the size of the optical design clear aperture and the position of an application spherical surface, converting the position into a third coordinate system for appearance processing, and processing the installation leaning surface of the curved surface prism by taking the rotary central shaft of the appearance shaft center as the shaft of the third coordinate system;
and finally, processing the rotary excircle of the curved prism by taking the mounting leaning surface as a reference and taking the third coordinate system as a processing coordinate system.
2. The method of claim 1, further comprising a step of inspecting the surface shapes of the two spherical surfaces of the curved prism and inspecting the dimensions of the curved prism.
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| CN202011247110.XA CN112394432A (en) | 2020-11-10 | 2020-11-10 | Method for processing special-shaped curved surface prism |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770766A (en) * | 2022-05-12 | 2022-07-22 | 北京创思工贸有限公司 | Method and process for improving cemented lens machining process based on centering turning |
| CN117124483A (en) * | 2023-07-13 | 2023-11-28 | 同济大学 | Free-form surface prism high-precision compensation processing method based on online and offline detection |
Citations (8)
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|---|---|---|---|---|
| JPH11337824A (en) * | 1998-05-27 | 1999-12-10 | Olympus Optical Co Ltd | Prism optical system and device using it |
| TW201003343A (en) * | 2008-07-11 | 2010-01-16 | Hon Hai Prec Ind Co Ltd | Method for processing an aspheric lens mold |
| CN102139376A (en) * | 2011-01-20 | 2011-08-03 | 天津大学 | Method for processing free-form surface prism |
| CN105538085A (en) * | 2015-12-03 | 2016-05-04 | 中国航空工业集团公司洛阳电光设备研究所 | Special-shaped lens machining method based on computer aided manufacturing (CAM) |
| CN106392821A (en) * | 2016-11-04 | 2017-02-15 | 中国航空工业集团公司北京航空精密机械研究所 | Free curved prism machining method |
| EP3226067A1 (en) * | 2016-03-29 | 2017-10-04 | Essilor International | Method for processing an unfinished optical lens member |
| CN110614382A (en) * | 2019-09-03 | 2019-12-27 | 同济大学 | Processing method for turning free-form surface prism in ultra-precision manner |
| CN110744389A (en) * | 2019-10-22 | 2020-02-04 | 西安应用光学研究所 | Positioning design and processing method of free-form surface prism |
-
2020
- 2020-11-10 CN CN202011247110.XA patent/CN112394432A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11337824A (en) * | 1998-05-27 | 1999-12-10 | Olympus Optical Co Ltd | Prism optical system and device using it |
| TW201003343A (en) * | 2008-07-11 | 2010-01-16 | Hon Hai Prec Ind Co Ltd | Method for processing an aspheric lens mold |
| CN102139376A (en) * | 2011-01-20 | 2011-08-03 | 天津大学 | Method for processing free-form surface prism |
| CN105538085A (en) * | 2015-12-03 | 2016-05-04 | 中国航空工业集团公司洛阳电光设备研究所 | Special-shaped lens machining method based on computer aided manufacturing (CAM) |
| EP3226067A1 (en) * | 2016-03-29 | 2017-10-04 | Essilor International | Method for processing an unfinished optical lens member |
| CN106392821A (en) * | 2016-11-04 | 2017-02-15 | 中国航空工业集团公司北京航空精密机械研究所 | Free curved prism machining method |
| CN110614382A (en) * | 2019-09-03 | 2019-12-27 | 同济大学 | Processing method for turning free-form surface prism in ultra-precision manner |
| CN110744389A (en) * | 2019-10-22 | 2020-02-04 | 西安应用光学研究所 | Positioning design and processing method of free-form surface prism |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114770766A (en) * | 2022-05-12 | 2022-07-22 | 北京创思工贸有限公司 | Method and process for improving cemented lens machining process based on centering turning |
| CN117124483A (en) * | 2023-07-13 | 2023-11-28 | 同济大学 | Free-form surface prism high-precision compensation processing method based on online and offline detection |
| CN117124483B (en) * | 2023-07-13 | 2024-03-08 | 同济大学 | Free-form surface prism high-precision compensation processing method based on online and offline detection |
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Application publication date: 20210223 |