CN101126825A - A New Method of Aspherical Grating Replication - Google Patents

Abstract

The utility model relates to a new method of non-spherical grating copy, belonging to a method of non-spherical grating copy in the spectrum technical field. The technical problem to be solved is providing a new method of non-spherical grating copy. The utility model adopts the technical proposal with following steps: firstly, selection of a non-spherical grating mother version; second, selection of a copying base; third, fabrication of a first copy version; fourth, fabrication of a second copy version. The utility model has the advantages of novel method, low cost and easy implementation. The fabrication cycle is shortened, and various lower cost non-spherical gratings can be made using the method. The method can bed used for mass production of non-spherical grating.

Description

The new method that a kind of aspheric grating duplicates

One, technical field

The invention belongs to the new method that a kind of aspheric grating of relating in the spectral technique field duplicates.

Two, background technology

Concave grating has the self-focusing characteristic, does not need collimating optical system and Focused Optical system can form spectral line when imaging.Aspheric grating is used for spectrometer system to have than concave grating superior characteristic more, can utilize the grating face shape of aspheric grating to adjust the aberration of spectrometer system.

Use aspheric grating can reduce the aberration of optical system, the size of dwindling spectral instrument reduces the amount of parts of forming, and improves image quality, resolving power and the measuring accuracy of spectral instrument.Therefore, aspheric grating becomes the indispensable optical element of development spectral technique.

The making of mother matrix aspheric grating has the processing technology complexity, fabrication cycle is long, production efficiency is low, processing cost is high and shortcoming such as repeatable difference.Adopting the epoxide-resin glue reproduction technology to produce aspheric grating can dwindle fabrication cycle, enhances productivity, reduce cost.Because the face shape of mother matrix is an aspheric surface, so require very strictness for the face shape of copy substrates, if copy substrates adopts aspheric surface can increase the cost of replica grating, the radius-of-curvature for substrate when adopting the sphere copy substrates requires very strict.The substrate curvature radius is excessive, can cause the epoxide-resin glue of core between motherboard aspheric grating and the copy substrates blocked up, separates the back because Temperature Influence causes cracked easily; The substrate curvature radius is too small, can cause that core contacts between motherboard aspheric grating and the copy substrates, and the epoxide-resin glue at edge is blocked up, equally can be because Temperature Influence cause crackedly, and the edge epoxide-resin glue flows out easily.So it is very important that selection has the copy substrates of suitable radius-of-curvature.

Three, summary of the invention

In order to overcome the defective that above-mentioned prior art exists, the objective of the invention is to propose a kind of new, cheaply, the aspheric grating that is easy to the realize new method of duplicating.

The technical problem to be solved in the present invention is: the new method that provides a kind of aspheric grating to duplicate.The technical scheme of technical solution problem is: the selection of the first step, mother matrix aspheric grating; Any once duplicate the mother matrix aspheric grating of all wanting selective light gate technique parameter to satisfy design, request for utilization because the performance of the aspheric grating that the mother matrix aspheric grating that is used for duplicating is decision after duplicating and the basic foundation of quality; The surface quality of mother matrix aspheric grating will be got well, and any defect on surface all can embody on the aspheric grating after duplicating; The selection of second step, copy substrates comprises the selection of copy substrates and secondary copy substrates; The mother matrix aspheric grating is a concave surface, one time copy substrates should be selected protruding sphere, and the protruding sphere of a copy substrates and the male and fomale(M﹠F) of mother matrix aspheric grating are during relative the coupling, contact around two face shapes, center section separates, and can make the epoxide-resin glue between grating and the substrate can retain like this; According to aspheric surface equation y ²+ z ²=2Rx-(1-e ²) x ², solve the concavo-convex sphere curvature radius that is complementary.In the formula, R represents vertex curvature radius, e ²The expression secondry constants; Peak-valley after being in contact with one another according to the substrate of mother matrix aspheric grating and a copy substrates is minimum principle, accurately solve protruding spherical radius with the most approaching relatively sphere of mother matrix aspherical concave grating by aspheric surface equation The numerical example, this is the radius of a copy substrates just; When selecting the secondary copy substrates, regard the mother matrix aspheric grating as convex surface, the secondary copy substrates should be selected concave surface, and at the face shape of mother matrix convex aspheric surface grating and secondary copy substrates concave spherical surface during relative the coupling, two faces contact around being, center section separates, help the middle epoxide-resin glue of two minute surfaces so not to outflow, peak-valley after being in contact with one another according to the substrate of mother matrix aspheric grating and secondary copy substrates is minimum principle, accurately solve the concave spherical surface radius of the most approaching relatively sphere of mother matrix aspheric grating by aspheric surface equation The numerical example, this is the radius of secondary copy substrates just; The making of the 3rd step, a duplicate plate, as shown in Figure 1, at first mother matrix aspheric grating 1 is put into vacuum coating equipment and plated separation oil film 2 and aluminium film 3 respectively, after the taking-up epoxide-resin glue is coated on the aluminium film 3 of mother matrix aspheric grating 1, form epoxy glue layer 4, then with copy substrates 5 with have mother matrix aspheric grating 1 bonding of separating oil film 2, aluminium film 3 and epoxide-resin glue 4, putting into drying box then solidifies, separate at last and cleaning, can obtain face shape is a duplicate plate 6 of protruding sphere; The making of the 4th step, secondary duplicate plate, as shown in Figure 2, a duplicate plate 6 is put into vacuum coating equipment plate separation oil film 7, aluminium film 8 respectively, after the taking-up epoxide-resin glue 9 is coated on the aluminium film 8 of a duplicate plate 6, then with secondary copy substrates 10 with have a duplicate plate 6 bondings of separating oil film 7, aluminium film 8 and epoxide-resin glue 9, putting into baking oven then solidifies, separate at last and cleaning, can obtain secondary duplicate plate 11, this edition is and the identical duplicated aspheric grating of 1 shape of mother matrix aspheric grating.

Principle of work explanation of the present invention: the peak-valley of utilization aspheric grating substrate and copy substrates should be minimum principle and selects suitable copy substrates, take the method for vacuum evaporation separation oil film and aluminium film, the glue bond of use epoxy resin, the aspheric grating that is not easy to make is made with the method for duplicating.Step 1 is selected the mother matrix aspheric grating.Step 2 is selected one time copy substrates.Step 3, the making of a duplicate plate.Step 4 is selected the secondary copy substrates.Step 5, the making of secondary duplicate plate, this edition is and the identical duplicated aspheric grating of 1 shape of mother matrix aspheric grating.

Good effect of the present invention is: the new method that aspheric grating of the present invention duplicates be novel, cheaply, be easy to realize, save cost widely, shortened fabrication cycle, utilize the inventive method can produce lower-cost all kinds of aspheric grating, this method can be used to produce in batches aspheric grating.

Four, description of drawings

Fig. 1 is the manufacturing process synoptic diagram of a duplicate plate among the present invention.Fig. 2 is the manufacturing process synoptic diagram of secondary duplicate plate among the present invention.

Five, embodiment

The present invention implements by technical scheme making step illustrated in figures 1 and 2, and is specific as follows:

1, option table and do not have flaw, the measured mother matrix aspheric grating of face shape matter, what we adopted is concave grating;

2, the peak-valley according to a substrate of mother matrix aspheric grating and a copy substrates should be minimum principle, by aspheric surface equation y ²+ z ²=2Rx-(1-e ²) x ², The numerical example accurately solves the most approaching relatively radius of sphere of mother matrix aspheric grating, and this is the radius of a copy substrates just;

3, the mother matrix aspheric grating is put into vacuum coating equipment plating separating oil and aluminium film;

4, use epoxide-resin glue with copy substrates and mother matrix aspheric grating bonding, carry out in the drying box that is operated in 60 ℃ that bonds;

5, the mother matrix aspheric grating that bonds together and a copy substrates are put into drying box and solidify, solidification temperature is about 65 ℃, 4-5 hour set time;

6, with blade scrape off accumulate in around and the epoxide-resin glue that has cured of Chamfer Edge place, a copy substrates after solidifying is separated with the cohesive body of mother matrix aspheric grating, carry out cleaning then with blowing up a balloon;

7, the method in the utilization step 2 is calculated the radius of secondary copy substrates;

8, the method in the utilization step 3,4,5 is made the secondary duplicate plate.

Claims (1)

1. A new method for aspheric grating replication, characterized in that: the first step, the selection of the master aspheric grating; any replication will select the master aspheric grating whose grating technical parameters meet design and service requirements, Because the master aspheric grating used for replication is the basic basis for determining the performance and quality of the replicated aspheric grating; the surface quality of the master aspheric grating is better, and any defects on the surface will be on the replicated aspheric grating Reflected; the second step, the selection of the copy base, including the selection of the first copy base and the second copy base; the master is aspherical and the grating is concave, the first copy base should choose a convex spherical surface, and the convex spherical surface of the first copy base is the same as When the concave and convex surfaces of the master aspheric grating are relatively matched, the two surfaces are in contact with each other, and the middle part is separated, so that the epoxy resin glue between the grating and the substrate can be retained; according to the aspheric surface equation y ² +z ² ＝2Rx-(1-e ² )x ² , to find out the radius of curvature of the spherical surface matching the concavo-convex. In the formula, R represents the radius of curvature of the apex, and ^e2 represents the quadratic constant; according to the principle that the peak-to-valley value of the master aspheric grating substrate and the primary copy substrate are in contact with each other, the aspheric surface equation is accurately solved through a numerical example. The closest comparison with the master aspherical concave grating is the convex spherical radius of the sphere, which is the radius of the first copy base; when selecting the second copy base, the master aspheric grating is regarded as a convex surface, and the second copy base should choose a concave surface , and when the surface shape of the master convex aspheric grating is relatively matched with the concave spherical surface of the secondary replication base, the two surfaces are in contact with each other, and the middle part is separated, which is conducive to the epoxy resin in the middle of the two mirrors. Outflow, according to the principle that the peak-to-valley value of the master aspheric grating substrate and the secondary copy substrate are in contact with each other, the concave spherical surface closest to the comparison spherical surface of the master aspheric grating is accurately solved through numerical examples of the aspheric surface equation Radius, which is the radius of the secondary copy substrate; the third step, the production of a copy plate, first put the master aspheric grating (1) into the vacuum coating machine to coat the separated oil film (2) and aluminum film (3 ), after taking it out, apply epoxy resin glue on the aluminum film (3) of the master plate aspheric grating (1) to form an epoxy resin glue layer (4), and then apply the primary replication base (5) and the aluminum film (3) with the separation oil film (2), the aluminum film (3) and the master aspheric grating (1) of the epoxy resin glue (4) are bonded, and then placed in a drying oven to cure, and finally separated and cleaned, the surface shape can be obtained. The primary replica (6) of the spherical surface; the fourth step, the production of the secondary replica, put the primary replica (6) into the vacuum coating machine to coat the separated oil film (7) and aluminum film (8) respectively, and put the Epoxy resin glue (9) is coated on the aluminum film (8) of primary replication plate (6), and then the secondary replication base (10) is mixed with separation oil film (7), aluminum film (8) and epoxy resin The primary copy (6) of the glue (9) is bonded, then put into an oven for curing, and finally separated and cleaned to obtain the second copy (11), which is the same as the master aspheric grating (1) A copied aspheric grating with the same surface shape.

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