CN1868950A - Glass lens preform and its preparation method - Google Patents

Abstract

The invention relates to a glass lens pre-product, which comprises: a glass lens blank and a protective film uniformly coated on the surface of the glass lens blank, and the material of the protective film is an easily soluble organic material. The invention also provides a preparation method of the glass lens pre-product.

Description

Glass lens preform and its preparation method

【Technical field】

The invention relates to a glass lens preform and a preparation method thereof.

【Background technique】

With the popularity of high-tech products such as digital cameras in the market, the optical glass lens processing industry has also developed rapidly in recent years. Cleaning operation is an important part of the optical glass lens processing and production process.

Glass lenses can be divided into spherical lenses and aspheric lenses according to their external shape. The so-called aspheric surface generally refers to a sphere that is not a perfect circle. The curvature of the spherical lens is constant, while the curvature of the aspheric lens is designed to be a predetermined variable. Therefore, the light rays passing through the spherical lens converge at different points on the optical axis, forming aberrations, while the light passing through the aspheric lens converges at the same point on the optical axis. , which can better eliminate aberrations. Aberrations cause wavefront loss and affect coupling efficiency. Therefore, designing aspheric lenses is one of the necessary means to eliminate aberrations. Because aspheric lenses can eliminate aberrations well and transmit light energy with high coupling efficiency, aspheric lens-related technologies develop rapidly and are widely used in digital cameras and camera phones.

At present, the lens processing technology commonly used by optical glass processing manufacturers in the industry is roughly as follows: glass blank-cleaning-molding-grinding core-cleaning-coating-cleaning. Among them, centering, also known as core seeking or edge grinding, refers to the process selected to obtain the specified radius and core accuracy. This process is carried out in the centering machine, and its function is to grind the edge of the glass lens blank to correct the optical accuracy of its center point, so as to avoid optical errors caused by installing it into the module after coating. In order to increase the smoothness of its grinding, cutting oil (also known as edging oil and core oil) is continuously sprayed on the surface of the glass lens blank during grinding.

For glass lenses, the coating process after centering and cleaning has very strict requirements on the cleanliness of the lens, so the cleaning process after centering is particularly important. However, in the cleaning process after centering, the main pollutants are cutting oil, fingerprints and dust, etc., because the surface of the glass lens is exposed before centering, and after centering, cutting oil and other pollution often occur on the upper and lower surfaces of the contacted glass lens. The case of a sphere and both sides of the surface. Moreover, during the grinding process, the amount of abrasives and glass particles produced by grinding sticks to the surface of the glass lens is too much, which will also cause cleaning difficulties. At present, the process of cleaning glass lenses generally needs to go through several processes such as lotion tank, tap water tank, pure water tank, isopropanol tank, isopropanol steam tank and oven. This kind of cleaning process is complicated and requires a large amount of cleaning materials, so The recycling cost is high, and industrial waste liquid is produced, causing serious pollution.

In view of this, it is necessary to provide a glass lens preform that can protect the glass lens from oil pollution and is easy to clean and a preparation method thereof.

【Content of invention】

Hereinafter, a glass lens pre-product will be described with an example.

And a method for preparing a glass lens preform is illustrated by an example.

In order to achieve the above, a glass lens pre-product is provided, which includes: a glass lens blank and a protective film uniformly coated on the surface of the glass lens blank, and the material of the protective film includes a soluble organic material.

The thickness of the protective film ranges from a micron (μm) level to a millimeter (mm) level.

The easily soluble organic material includes polymer material and wax.

The polymer material includes polyvinyl chloride (Polyvinyl Chloride, PVC), polyvinyl alcohol (Polyvinyl Alcohol, PVA) and other common engineering plastics.

The glass lens blanks include aspherical glass lens blanks, spherical glass lens blanks and other glass lens blanks.

And, provide a kind of glass lens preform preparation method, it comprises the following steps:

providing a coating solution comprising a soluble organic material;

Soaking a glass lens blank in the coating solution to form a protective film on the surface of the glass lens blank;

The coated glass lens blank is dried to form a glass lens preform.

The easily soluble organic material is a polymer material.

The polymer material includes polyvinyl chloride (Polyvinyl Chloride, PVC), polyvinyl alcohol (Polyvinyl Alcohol, PVA) and other common engineering plastics.

The coating solution is an easily soluble organic material solution with a predetermined concentration.

The predetermined concentration is 0.5% to 10%.

Preferably, the predetermined concentration is 2% to 5%.

The easily soluble organic material is wax.

The coating liquid is a molten liquid of easily soluble organic materials.

The thickness of the protective film ranges from micrometers to millimeters.

Compared with the prior art, in the glass lens preform and its preparation method provided by this embodiment, the protective film uses general engineering plastics as raw materials and the dosage is small, easy to select materials and low in cost, and the protective film can be used later During the centering process, avoid oil and other stains from contaminating the glass lens blank. Due to the weak bonding between the protective film made of polymer or wax and the glass lens blank, after the core is fixed, the protective film can be easily removed by ultrasonic cleaning, which can simplify the cleaning process, and the required cleaning materials It can greatly reduce and reduce the amount of pollution.

【Description of drawings】

Fig. 1 is a schematic diagram of a glass lens preform in an embodiment of the technical solution.

Fig. 2 is a flowchart of the preparation of a glass lens preform in the embodiment of the technical solution.

【Detailed ways】

The technical solution will be further described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, the present embodiment provides a glass lens pre-product 10, which includes a glass lens blank 11 and a protective film 12 evenly coated on the surface of the glass lens blank 11, the material of the protective film 12 is Easily soluble organic material.

The thickness of the protection film 12 ranges from micrometers to millimeters.

The easily soluble organic material includes polymer material and wax.

The polymer material includes polyvinyl chloride (Polyvinyl Chloride, PVC), polyvinyl alcohol (Polyvinyl Alcohol, PVA) and other common engineering plastics.

The glass lens blank 11 includes an aspherical glass lens blank, a spherical glass lens blank and other glass lens blanks.

The glass lens pre-product 10 provided in this embodiment can be used in the process of making various glass lenses. When the glass lens blank 11 is centered, the protective film 12 formed on the surface of the glass lens preform 10 can effectively protect the glass lens blank 11 from cutting oil and other pollution; The bonding force with the glass lens blank 11 is weak, and after the centering process is completed, the protective film 12 on the surface of the glass lens preform 10 can be easily removed to obtain the desired lens.

Please refer to FIG. 1 and FIG. 2 together. This technical solution also provides a method for preparing a glass lens preform 10, which includes the following steps:

providing a coating solution comprising a soluble organic material;

Soaking a glass lens blank 11 in the coating solution to form a protective film 12 on the lens;

The coated glass lens blank 11 is dried to form a glass lens preform 10 .

In this technical solution, the preparation method of the glass lens pre-product 10 is described in detail in combination with examples.

providing a coating solution comprising a soluble organic material;

A glass lens blank 11 is placed in the polymer solution, and a layer of protective film 12 is formed on the glass lens blank 11 by soaking;

Place the glass lens blank 11 soaked and coated in the air extraction system, and take it out after two hours.

The macromolecule solution that the present embodiment adopts can be selected following two kinds for use: one is the solution that polyvinyl chloride (PolyvinylChloride, PVC) polymer is dissolved in ethanol solution and is made into, and its two is polyvinyl alcohol (Polyvinyl Alcohol, PVA) A solution made of polymers dissolved in pure water. The protective film plated by the two solutions is easier to remove in the last step of removing the protective film. The concentration of the prepared solution is 0.5% to 10%, and the optimal range is 2% to 5%, so as to ensure that the thickness of the protective film is above the micron level.

In order to increase the dissolution rate of PVC and PVA, it can be stirred and heated while dissolving. Since the solvent volatilizes during heating, attention must be paid to supplementing the amount of solvent.

In this embodiment, in order to effectively protect the glass lens blank 11 from pollution such as cutting oil, the coating thickness of the protective film 12 must be at least in the order of microns or even in the order of millimeters, and it must be fully and evenly coated. In addition, After the film is covered, it must be easy to remove.

In order to detect whether the thickness of the protective film 12 obtained after soaking meets the above requirements, the thickness Y of the protective film 12 can also be measured after it is taken out from the air extraction system. The instrument used to measure is a Fourier transform infrared (FT-IR) instrument, by the following relationship:

$\frac{\mathrm{<span\; class="notranslate">\; Y</span>}}{\mathrm{<span\; class="notranslate">\; x</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}}{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}$

Wherein, A is the surface detection thickness of the coating polymer protective film, which is the absorption value of a certain strong absorption peak of detection FT-IR. A ₀ is the surface detection thickness of a standard known polymer film, which is the absorption value of the same strong absorption peak detected in FT-IR. Y is the thickness of the coated polymer protective film, and X is the thickness of the standard known polymer film.

Deduce the thickness Y of protective film 12 as:

$\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; A</span>}}{{\mathrm{<span\; class="notranslate">\; A</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; x</span>}$

Of course, in order to eliminate the accidental error of the experiment, it is necessary to find the optimal thickness through multiple measurements of the experiment.

Because the protective film 12 of the glass lens preform 10 cannot be directly placed in the detection cell of the FT-IR instrument to be detected by the penetrating method, we made a simple mirror assembly to detect by the reflection and absorption method. The lens group includes two flat glass lenses and a jig for placing the lenses. Manually adjust the incident infrared light to hit the surface of the glass lens blank 11, and then reflect to another lens and then to the FT-IR detector.

Through the deduced thickness Y value of the protective film 12 , it can be judged whether the step of soaking to obtain the protective film 12 is successful.

After the centering process is completed, the protective film 12 of the glass lens pre-product 10 needs to be removed. This process can utilize ultrasonic cleaning technology, utilize the principle of similar miscibility, soak the glass lens pre-product 10 in the used solvent of preparation solution and add ultrasonic cleaning. Soak in pure water for ultrasonic cleaning. Cleaning can be followed by a further simple cleaning process.

In other embodiments, solutions of other engineering plastic polymers can also be used, or melted wax can be used as the coating liquid, such as soaking the glass lens blank 11 in melted wax for 1 minute to coat a layer of wax film protective film 12. Forming a glass lens pre-product 10. It can also play a role in preventing oil pollution during the core setting process.

The embodiment of the present invention is: respectively preparing PVC ethanol solutions with concentrations of 0.1%, 0.5%, 2%, 4%, 5%, 6%, 8%, 10%, 12% and 15%. Put the glass lens blank 11 into the jig, put the whole jig into the prepared PVC ethanol solution, soak it horizontally for 1 minute, then slowly move it out horizontally at a speed of 5 mm/s, remove the jig, and the whole jig Put it on the hot air conveyor belt and send it to the core fixing area. The temperature on the hot air conveyor belt is kept at 50-60 ° C, and the time for the jig to be on it lasts for about 30 minutes. Depending on the type of polymer selected, the temperature also varies.

Experiments have found that a solution with a concentration of 2% to 5% has a better coating effect, and a solution with a concentration higher than 10% or lower than 0.5% has a poor coating effect.

The method for preparing a glass lens preform in this embodiment can be used for aspheric glass lens blanks, spherical glass lens blanks and other glass lens blanks.

Compared with the prior art, in the glass lens preform and its preparation method provided by this embodiment, the protective film uses general engineering plastics as raw materials and the dosage is small, easy to select materials and low in cost, and the protective film can be used later During the centering process, avoid oil and other stains from contaminating the glass lens blank. Due to the weak bonding between the protective film made of polymer or wax and the glass lens blank, after the core is fixed, the protective film can be easily removed by ultrasonic cleaning, which can simplify the cleaning process, and the required cleaning materials Can be greatly reduced, reducing the amount of pollution.

It can be understood that, for those skilled in the art, various other corresponding changes and modifications can be made according to the technical scheme and technical concept of the present invention, and all these changes and modifications should belong to the claims of the present invention. protected range.

Claims (15)

1. glass lens semifinished product, it comprises: a glass mirror blank and is uniformly coated on the protective membrane on described glass mirror blank surface, it is characterized in that, and described protective membrane material is the processable organic materials.

2. glass lens semifinished product as claimed in claim 1 is characterized in that, the thickness range of described protective membrane is that micron order is to the millimeter level.

3. glass lens semifinished product as claimed in claim 1 is characterized in that, described processable organic materials comprises macromolecular material, wax.

4. glass lens semifinished product as claimed in claim 3 is characterized in that described macromolecular material comprises polyvinyl chloride, polyvinyl alcohol.

5. as any described glass lens semifinished product in the claim 1 to 4, it is characterized in that described glass mirror blank comprises spheric glass blank, aspherical lens blank.

6. glass lens semifinished product preparation method, it comprises the steps:

The one overlay film liquid that comprises the processable organic materials is provided;

One glass mirror blank is immersed in the described overlay film liquid, makes described glass mirror blank surface form layer protecting film;

The glass mirror blank of dry overlay film forms glass lens semifinished product.

7. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that, described processable organic materials is a macromolecular material.

8. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that described macromolecular material comprises polyvinyl chloride, polyvinyl alcohol.

9. glass lens semifinished product preparation method as claimed in claim 7 is characterized in that, described overlay film liquid is the processable organic material solution with predetermined concentration.

10. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that, described predetermined concentration is 0.5% to 10%.

11. glass lens semifinished product preparation method as claimed in claim 10 is characterized in that, described predetermined concentration is 2% to 5%.

12. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that, described processable organic materials is a wax.

13. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that, described overlay film liquid is the fused solution of processable organic materials.

14. glass lens semifinished product preparation method as claimed in claim 6 is characterized in that, the thickness range of described protective membrane is that micron order is to the millimeter level.

15., it is characterized in that described glass mirror blank comprises spheric glass blank, aspherical lens blank as any described glass lens semifinished product preparation method in the claim 6 to 14.