CN114772905B - Method for adjusting surface type of aspherical precision mould pressing lens - Google Patents
Method for adjusting surface type of aspherical precision mould pressing lens Download PDFInfo
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- CN114772905B CN114772905B CN202210490027.8A CN202210490027A CN114772905B CN 114772905 B CN114772905 B CN 114772905B CN 202210490027 A CN202210490027 A CN 202210490027A CN 114772905 B CN114772905 B CN 114772905B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The application provides an adjusting method for the surface type of an aspherical precision molded lens, which comprises two conditions of too fast shrinkage and too slow shrinkage of the lens.
Description
Technical Field
The application relates to the field of adjustment of precision molded lens surfaces, in particular to an adjustment method of an aspherical precision molded lens surface.
Background
The chalcogenide glass has two special properties, namely the first property is thermal deformation, the chalcogenide glass is softened after being heated to about 200 ℃, at the moment, the chalcogenide glass can be shaped by applying external force, and the chalcogenide glass can be shaped into a required shape after the temperature is reduced. The second characteristic is thermal expansibility, the glass is heated to have a larger thermal expansion volume, but the glass is reduced in temperature to have a volume shrinkage, so that the shrinkage direction is random, and the aspherical surface type is distinguished from the surface type of the die core surface. The aspheric surface type focusing distance has larger influence, and the surface type difference is too large, so that light can not be converged to a designed focus after passing through the lens, and the imaging of the whole lens module can be influenced. However, in actual molding processes, the lens' face shape typically appears to be out of standard, thus requiring adjustments to the process.
Disclosure of Invention
In view of the problems in the background art, an object of the present disclosure is to provide a method for adjusting the surface profile of an aspherical precision press-molded lens.
In order to achieve the above-mentioned purpose, the present disclosure provides a method for adjusting the surface shape of an aspherical precision molded lens, wherein the method comprises two conditions of too fast shrinkage and too slow shrinkage of the lens, and the molding process comprises three preheating stages, two molding stages and three cooling stages;
when the lens shrinks too fast, its adjusting step includes:
step one: raising the temperature of the first cooling part to 0-5 ℃ which is lower than the temperature of the second molding part, and adjusting the temperature to 0-5 ℃ each time;
step two: when the molded lens has a tendency of smaller pv value, repeating the first step until the pv value of the lens is no longer smaller or even larger, and taking a cooling temperature value when the pv value is no longer smaller at the last time;
step three: when the first cooling temperature is increased in the first step, the pv value is not reduced, the first cooling temperature in the first step is returned, then the second cooling temperature is increased, the second cooling temperature is increased to 5-30 ℃ which is less than the first cooling temperature, and the temperature is adjusted to 0-5 ℃ each time;
step four, if the pv value of the lens after the mold pressing detection is reduced, repeating the temperature adjustment method in the step three until the pv value is no longer changed or even increased, and taking the parameter of the cooling II of which the pv value is no longer changed at the last time;
when the lens is too slow to shrink, its adjustment steps include:
a. cooling the first cooling temperature to 5-30deg.C below the second molding temperature, and adjusting the temperature to 0-5deg.C each time;
b. when the molded lens has a trend of smaller pv value, repeating the step a until the pv value of the lens is not smaller or even larger, and taking the temperature value of the cooling first with the pv value not smaller at the last time;
c. in the step a, when the first cooling temperature is reduced, the pv value is not reduced and increased, the second cooling temperature is reduced to 5-30 ℃ which is less than the first cooling temperature, and the temperature is regulated to 0-5 ℃ each time;
d. if the pv value of the lens after the mold pressing detection is reduced, the temperature adjusting method in the step c is repeated until the pv is not changed or even increased, and then the parameter of the cooling II, of which the pv value is not changed at the last time, is taken.
In some embodiments, in step one, the first cooling temperature is raised to 3-5 ℃ less than the second molding temperature.
In some embodiments, in step one, the temperature is adjusted to 3-5 ℃ each time.
In some embodiments, in step three, the second cooling temperature is increased to 2-5 ℃ less than the first cooling temperature.
In some embodiments, in step three, the temperature is adjusted to 2-5 ℃ each time.
In some embodiments, in step a, the first cooling temperature is reduced to 5-25 ℃ below the second molding temperature, with the temperature being adjusted to 2-5 ℃ each time.
In some embodiments, in step c, the second cooling temperature is reduced to 5-25 ℃ less than the first cooling temperature, with the temperature being adjusted to 2-5 ℃ each time.
The beneficial effects of the present disclosure are as follows:
the present disclosure improves the surface shape of molded lenses by adjusting the process during molding, which process imperfections can be effectively accommodated, with the surface shape generally maximized within the process.
Detailed Description
The following describes in detail the method for adjusting the surface of the aspherical precision press-molded lens of the present application.
The aspheric precision molding process comprises three preheating stages, two molding stages and three cooling stages, wherein the temperature, pressure and time of each stage are adjustable, and four conditions of n and u appear on the convex and concave surface type of the lens. Wherein the concave and convex surfaces contract too fast and contract too slow in the same manner.
The root cause of the too fast shrinkage, which includes the convex u-type and the concave n-type, is the excessive temperature difference of the lens in the cooling stage.
Shrinkage is too slow, including both convex u-type and concave n-type, due to the fact that during cooling of the lens, the temperature difference is too small resulting in the final shrinkage of the lens edge portion too slow resulting in poor surface quality.
The application discloses an adjusting method for the surface type of an aspherical precision mould pressing lens, which comprises two conditions of too fast shrinkage and too slow shrinkage of the lens, wherein the mould pressing process comprises three preheating stages, two forming stages and three cooling stages;
when the lens shrinks too fast, its adjusting step includes:
step one: raising the temperature of the first cooling part to 0-5 ℃ which is lower than the temperature of the second molding part, and adjusting the temperature to 0-5 ℃ each time;
step two: when the molded lens has a tendency of smaller pv value, repeating the first step until the pv value of the lens is no longer smaller or even larger, and taking a cooling temperature value when the pv value is no longer smaller at the last time;
step three: when the first cooling temperature is increased in the first step, the pv value is not reduced and increased, the second cooling temperature is increased to 5-30 ℃ which is less than the first cooling temperature, and the temperature is adjusted to 0-5 ℃ each time;
step four, if the pv value of the lens after the mold pressing detection is reduced, repeating the temperature adjustment method in the step three until the pv value is no longer changed or even increased, and taking the parameter of the cooling II of which the pv value is no longer changed at the last time;
when the lens is too slow to shrink, its adjustment steps include:
a. the first cooling temperature is reduced to be less than the second molding temperature of 5-30 ℃ and the temperature is regulated to be 0-5 ℃ each time:
b. when the molded lens has a trend of smaller pv value, repeating the step a until the pv value of the lens is not smaller or even larger, and taking the temperature value of the cooling first with the pv value not smaller at the last time;
c. in the step a, when the first cooling temperature is reduced, the pv value is not reduced and increased, the second cooling temperature is reduced to 5-30 ℃ which is less than the first cooling temperature, and the temperature is regulated to 0-5 ℃ each time;
d. if the pv value of the lens after the mold pressing detection is reduced, the temperature adjusting method in the step c is repeated until the pv is not changed or even increased, and then the parameter of the cooling II, of which the pv value is not changed at the last time, is taken.
In some embodiments, in step one, the first cooling temperature is raised to 3-5 ℃ less than the second molding temperature.
In some embodiments, in step one, the temperature is adjusted to 3-5 ℃ each time.
In some embodiments, in step three, the second cooling temperature is increased to 2-5 ℃ less than the first cooling temperature.
In some embodiments, in step three, the temperature is adjusted to 2-5 ℃ each time.
In some embodiments, in step a, the first cooling temperature is reduced to 5-25 ℃ below the second molding temperature, with the temperature being adjusted to 2-5 ℃ each time.
In some embodiments, in step c, the second cooling temperature is reduced to 5-25 ℃ less than the first cooling temperature, with the temperature being adjusted to 2-5 ℃ each time.
[ test ]
Example 1
The lens is detected on a Taylor profiler after appearance is observed under a microscope, whether the pv value is within a qualified range or not is checked, the pv value is 0.8422 mu m, the requirement of a customer drawing is below 0.8 mu m, at the moment, the lens surface type is unqualified, the process is required to be adjusted, the reference detection pattern is U-shaped, and the outer edge of the lens is too fast to shrink.
The preparation method comprises the steps of preheating at 150deg.C, molding at 210 deg.C, molding at 220 deg.C, cooling at 190 deg.C, and cooling at 174 deg.C.
When the lens is contracted too fast, the adjusting step comprises the following steps:
step one: raising the temperature of the first cooling step to 194 ℃, and forming the second cooling step to 220 ℃;
step two: when the temperature of the first cooling step is increased, the pv value is not reduced and increased to 0.9 mu m, the temperature of the first cooling step is adjusted back to 190 ℃, and the temperature of the second cooling step is increased to 179 ℃;
and step four, detecting and observing the pv value of the molded lens to be reduced to 0.636 mu m, wherein the molded lens meets the standard.
Example 2
When the lens is too slow to shrink, its adjustment steps include:
the lens is detected on a Taylor profiler after appearance is observed under a microscope, whether the magnitude of the pv value is in a qualified range or not is checked, the pv value is 1.0223 mu m, the requirement of a customer drawing is below 0.8 mu m, at the moment, the lens surface type is unqualified, the process is required to be adjusted, the reference detection convex surface pattern is u-shaped, the concave surface is n-shaped, and the outer edge of the lens is too slow in shrinkage. The adjustment mode is to increase the cooling temperature difference.
The preparation method comprises the steps of preheating at 180deg.C, molding at 230deg.C, molding at 240 deg.C, cooling at 220deg.C, and cooling at 195 deg.C.
a. The cooling one temperature was reduced to 235℃at a pv value of 1.3. Mu.m, so that the phase of influence on the surface profile was not between the two shaping and the one cooling.
b. The cooling temperature was again adjusted to 240℃and the cooling temperature was reduced from 195℃to 190. Mu.m, and the pv value of the rear surface of the molded lens reached 1.056. Mu.m, so that the surface type failure was due to the problem of too small temperature difference between the two cooling stages. At this point, the temperature of the second cooling stage was lowered to 185℃and the pv value of the molded lens was lowered to 0.76. Mu.m, at which point the lens was in compliance.
Claims (7)
1. An adjusting method of aspherical precision mould pressing lens surface, wherein,
the method comprises the two conditions of too fast shrinkage and too slow shrinkage of the lens, and the molding process comprises three preheating stages, two molding stages and three cooling stages;
when the lens shrinks too fast, its adjusting step includes:
step one: raising the temperature of the first cooling part to 0-5 ℃ which is lower than the temperature of the second molding part, and adjusting the temperature to 0-5 ℃ each time;
step two: when the molded lens has a tendency of smaller pv value, repeating the first step until the pv value of the lens is no longer smaller or even larger, and taking a cooling temperature value when the pv value is no longer smaller at the last time;
step three: when the first cooling temperature is increased in the first step, the pv value is not reduced, the first cooling temperature in the first step is returned, then the second cooling temperature is increased, the second cooling temperature is increased to 5-30 ℃ which is less than the first cooling temperature, and the temperature is adjusted to 0-5 ℃ each time;
step four, if the pv value of the lens after the mold pressing detection is reduced, repeating the temperature adjustment method in the step three until the pv value is no longer changed or even increased, and taking the parameter of the cooling II of which the pv value is no longer changed at the last time;
when the lens is too slow to shrink, its adjustment steps include:
a. cooling the first cooling temperature to 5-30deg.C below the second molding temperature, and adjusting the temperature to 0-5deg.C each time;
b. when the molded lens has a trend of smaller pv value, repeating the step a until the pv value of the lens is not smaller or even larger, and taking the temperature value of the cooling first with the pv value not smaller at the last time;
c. in the step a, when the first cooling temperature is reduced, the pv value is not reduced and increased, the second cooling temperature is reduced to 5-30 ℃ which is less than the first cooling temperature, and the temperature is regulated to 0-5 ℃ each time;
d. if the pv value of the lens after the mold pressing detection is reduced, the temperature adjusting method in the step c is repeated until the pv is not changed or even increased, and then the parameter of the cooling II, of which the pv value is not changed at the last time, is taken.
2. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the first step, the cooling first temperature is raised to 3-5 ℃ which is lower than the molding second temperature.
3. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the first step, the temperature is adjusted to 3 to 5 ℃ each time.
4. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the third step, the cooling temperature is raised to 2 to 5 ℃ which is lower than the cooling temperature.
5. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the third step, the temperature is adjusted to 2 to 5 ℃ each time.
6. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the step a, the cooling temperature is lowered to 5 to 25 ℃ below the molding temperature, and the temperature is adjusted to 2 to 5 ℃ each time.
7. The method of adjusting the surface profile of an aspherical precision press-molded lens according to claim 1, wherein in the step c, the cooling two temperatures are reduced to 5-25 ℃ which is less than the cooling one temperature, and the temperature is adjusted to 2-5 ℃ each time.
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| CN202210490027.8A CN114772905B (en) | 2022-04-29 | 2022-04-29 | Method for adjusting surface type of aspherical precision mould pressing lens |
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