CN114603762A - Optical lens molding device and molding method - Google Patents
Optical lens molding device and molding method Download PDFInfo
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- CN114603762A CN114603762A CN202210317736.6A CN202210317736A CN114603762A CN 114603762 A CN114603762 A CN 114603762A CN 202210317736 A CN202210317736 A CN 202210317736A CN 114603762 A CN114603762 A CN 114603762A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 75
- 238000000465 moulding Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 35
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 136
- 239000011521 glass Substances 0.000 claims abstract description 104
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 68
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 68
- 238000003825 pressing Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 230000008569 process Effects 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 18
- 238000007723 die pressing method Methods 0.000 description 13
- 239000000463 material Substances 0.000 description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000003491 array Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910021419 crystalline silicon Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/52—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0016—Lenses
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Abstract
The invention discloses an optical lens molding forming device, which comprises a molding die and a carbon dioxide laser, wherein the surface of a glass preform in contact with a forming surface is locally and rapidly heated and softened by the carbon dioxide laser to form a softening layer, and then the softening layer is molded, so that the rapid molding forming of the glass preform is facilitated. The invention does not need to heat and anneal the glass preform and the die for a long time in the process of die forming of the optical lens, thereby solving the problems that the appearance precision and the lower residual stress of the prior optical lens are ensured after the die forming, the production efficiency is improved and the service life of the die is prolonged. The invention also provides a method for molding the optical lens, which comprises the steps of firstly utilizing carbon dioxide laser to rapidly heat the local contact position of the glass preform and the molding surface, and then rapidly molding the glass preform by mold, so as to realize the rapid molding of the optical lens.
Description
Technical Field
The invention belongs to the field of precision optics and micro-nano manufacturing, relates to an optical lens processing technology, and particularly relates to an optical lens mould pressing forming device and a forming method.
Background
With the development of modern precision optics and micro-nano manufacturing technology, microlens arrays are widely applied to the fields of optical calculation, photoelectric communication, chip manufacturing, three-dimensional imaging and the like, and meanwhile, a die forming method has important research value as an important method for manufacturing the microlens arrays in batches at low cost.
At present, the die pressing of the microlens array adopts an integral heating die pressing method, namely, a die and a glass preform are integrally heated, the die and the glass preform are integrally heated to reach the die pressing forming temperature, the die pressing forming is carried out after the glass preform is integrally softened, and then the die and the formed microlens array are integrally cooled, so that each component of the die and the microlens array are cooled to the normal temperature state.
The existing integral heating and compression molding method still has defects. Because the thermal conductivity of glass material itself is relatively poor, consequently need carry out the heating of longer time and keep warm a period of time to glass preform and mould whole in the heat-softening stage, so that each subassembly of mould and glass preform all reach softening temperature inside and outside, this process required time is longer, simultaneously because glass cools off inequality or cooling rate too fast can produce great residual stress, residual stress can make the microlens array cracked on the one hand, on the other hand still can make the refractive index change of microlens array itself, and then make actual light deviate from original design direction, produce the aberration, reduce the imaging. Therefore, a long time is required for slow cooling in the dwell annealing stage of the microlens array to reduce the residual stress of the microlens array. In order to ensure the forming quality of the microlens array and reduce the residual stress, long time is needed in the heating and softening stage of the glass preform and the pressure maintaining and cooling stage of the formed microlens array, so that the production period of the microlens array is greatly prolonged by the integral heating and pressure forming method, and the service life of the microlens array mold is also seriously reduced under the action of high temperature and high pressure for a long time.
Therefore, there is a need for a novel optical lens molding apparatus and a novel optical lens molding method, so as to overcome the problems of ensuring the shape accuracy and lower residual stress after the molding of the microlens array, and improving the production efficiency and the mold life.
Disclosure of Invention
The invention aims to provide an optical lens die-pressing forming device and a forming method, which realize the rapid die-pressing forming of a glass preform by utilizing a carbon dioxide laser to emit laser to locally and rapidly heat the glass preform so as to solve the problems that the shape precision and lower residual stress of a micro-lens array are ensured after the die-pressing forming, the production efficiency is improved and the service life of a die is prolonged.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an optical lens molding device, comprising:
the mould pressing die comprises an upper die and a lower die, and the lower die is used for placing the glass preform; the lower end face of the upper die and/or the upper end face of the lower die are/is provided with forming surfaces which can be matched with the shape of the finished optical lens, and the upper die and/or the lower die are/is of a transparent structure;
and the carbon dioxide laser can emit carbon dioxide laser towards the glass preform so as to heat and soften the surface of the glass preform, which is in contact with the forming surface, to form a softening layer.
Optionally, the lower mold includes:
the upper end surface of the lower mold core is used for placing the glass preform; the lower end of the lower mold core extends to the outer periphery to form a step;
the inner sleeve is sleeved on the periphery of the lower mold core and positioned on the step; the upper end surface of the inner sleeve is higher than the upper end surface of the lower mold core, the part of the inner sleeve higher than the lower mold core and the upper end surface of the lower mold core enclose to form a first accommodating cavity, and the glass preform is placed in the first accommodating cavity;
the outer sleeve, the outer sleeve cover is located the inner skleeve and the periphery of step, just the lower terminal surface of outer sleeve with the lower terminal surface parallel and level of step, the up end of outer sleeve is higher than the up end of inner skleeve, the outer sleeve is higher than the part of inner skleeve the up end of inner skleeve and the upper surface of glass preform encloses and closes formation second holding chamber, second holding intracavity is used for placing go up the mould.
Optionally, the lower end surface of the upper die is a plane, and the upper end surface of the lower die is provided with the forming surface; the upper die is a transparent upper die, and the carbon dioxide laser is arranged above the upper die and can emit the carbon dioxide laser to the lower surface of the glass preform.
Optionally, the forming surfaces are arranged on both the lower end surface of the upper die and the upper end surface of the lower die; the upper die and the lower die are both of transparent structures. The carbon dioxide lasers are arranged above the upper die and below the lower die.
Optionally, the upper end surface of the lower die is a plane, and the lower end surface of the upper die is provided with the forming surface; the lower die is a transparent lower die, and the carbon dioxide laser is arranged below the lower die and can emit the carbon dioxide laser to the upper surface of the glass preform.
Optionally, the transparent lower die and the transparent upper die are made of materials with low carbon dioxide laser absorption rate, high carbon dioxide laser transmittance, high melting point, high strength and high hardness. Such as a transparent quartz glass material or crystalline silicon carbide.
Optionally, the glass preform further comprises a laser adjusting mechanism, wherein the carbon dioxide laser is mounted on the laser adjusting mechanism, so that the carbon dioxide laser is ensured to be focused on the lower surface of the glass preform by adjusting the distance between the carbon dioxide laser and the upper die.
Optionally, the finished optical lens is a microlens array, and the forming surface is an array of microlens concave surfaces capable of matching the shape of the microlens array.
Optionally, the finished optical lens is a fresnel lens, and the forming surface is a concentric concave array capable of matching the shape of the fresnel lens.
Optionally, the optical lens finished product is a micro-cylindrical mirror array, and the forming surface is an array of concave surfaces of the micro-cylindrical mirror, the concave surfaces of the micro-cylindrical mirror being capable of matching the shape of the micro-cylindrical mirror array.
Optionally, the lower die is stationary, and the upper die is connected with a die pressing drive; the mould pressing drive is used for driving the upper mould to be close to or far away from the lower mould.
Meanwhile, the invention provides a die pressing forming method of the optical lens, which comprises the following steps:
s1, emitting a carbon dioxide laser beam to a contact position between the glass preform and the forming surface to heat and raise the temperature of the forming surface and soften the surface of the glass preform in contact with the forming surface;
and S2, making the upper die and the lower die close to each other to press-mold the glass preform.
In addition, the invention also provides another optical lens die forming method which is completed based on the optical lens die forming device and is characterized by comprising the following steps:
s1, emitting carbon dioxide laser between the lower surface of the glass preform and the forming surface of the lower die to heat and raise the temperature of the forming surface and soften the lower surface of the glass preform;
and S2, making the upper die and the lower die close to each other to press-mold the glass preform and form the finished optical lens.
Compared with the prior art, the invention has the following technical effects:
the optical lens die-pressing forming device provided by the invention has a novel and reasonable structure, and utilizes the carbon dioxide laser to emit carbon dioxide laser towards the glass preform so as to locally and rapidly heat and soften the surface of the glass preform, which is in contact with the forming surface, to form a softening layer, and then carries out die pressing on the softening layer, thereby being beneficial to rapid die-pressing forming of the glass preform. The optical lens mould pressing forming device does not need to heat and maintain pressure and anneal the whole body of the glass preform and the mould for a long time in the optical lens mould pressing forming process, the local rapid heating of the contact position of the glass preform and the forming surface is carried out by utilizing laser, and then the mould pressing forming is carried out rapidly, so that the problems that the appearance precision and the lower residual stress are ensured after the current optical lens is mould pressed and formed, the production efficiency is improved, and the service life of the mould is prolonged are solved.
In addition, the optical lens mould pressing forming method provided by the invention firstly utilizes carbon dioxide laser to quickly heat the local contact position of the glass preform and the forming surface, and then quickly mould pressing forming is carried out, so that the quick mould pressing forming of the optical lens is realized, and the technical problems of low mould pressing forming efficiency, long production period and overlarge residual stress of the existing optical lens are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an optical lens molding apparatus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a molding apparatus for molding an optical lens according to an embodiment of the present invention.
Wherein the reference numerals are: 1. molding a die; 11. an upper die; 12. a lower die; 121. a lower mold core; 122. an inner sleeve; 123. an outer sleeve; 124. a step; 2. a glass preform; 3. a forming surface; 4. a carbon dioxide laser; 5. a softening layer; 6. and (5) finishing the optical lens.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
One of the objectives of the present invention is to provide an optical lens molding device, which uses a carbon dioxide laser to emit laser to locally and rapidly heat a glass preform, so as to achieve rapid molding of the glass preform, thereby solving the problems of ensuring the shape accuracy and lower residual stress of a microlens array after molding, and improving the production efficiency and the mold life.
Another objective of the present invention is to provide a method for press molding an optical lens, which uses a carbon dioxide laser to emit laser to locally and rapidly heat a glass preform, so as to achieve rapid press molding of the glass preform, thereby solving the problems of ensuring the shape accuracy and low residual stress of a microlens array after press molding, and improving the production efficiency and the mold life.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1 and 2, the present embodiment provides an optical lens press-forming apparatus, comprising a press mold 1 and a carbon dioxide laser 4, wherein the press mold 1 comprises an upper mold 11 and a lower mold 12, and the lower mold 12 is used for placing a glass preform 2 thereon; a forming surface 3 which can be matched with the shape of the optical lens finished product 6 is arranged on the lower end surface of the upper die 11 and/or the upper end surface of the lower die 12, and the upper die 11 and/or the lower die 12 are of a transparent structure (namely the upper die 11 is a transparent upper die and/or the lower die 12 is a transparent lower die); the carbon dioxide laser 4 can emit carbon dioxide laser toward the glass preform 2 to heat and soften the surface of the glass preform 2 in contact with the molding surface 3 to form the softened layer 5, which is a basis for the subsequent press molding.
In this embodiment, as shown in fig. 1, the lower mold 12 includes a lower mold core 121, an inner sleeve 122, and an outer sleeve 123, and the upper end surface of the lower mold core 121 is used for placing the glass preform 2; the lower end of the lower mold core 121 extends to the outer periphery to form a step 124; the inner sleeve 122 is sleeved on the periphery of the lower mold core 121 and is positioned on the step 124; the upper end surface of the inner sleeve 122 is higher than the upper end surface of the lower mold core 121, the part of the inner sleeve 122 higher than the lower mold core 121 and the upper end surface of the lower mold core 121 enclose to form a first accommodating cavity, and the glass preform 2 is placed in the first accommodating cavity; the outer sleeve 123 is sleeved on the outer peripheries of the inner sleeve 122 and the step 124, the lower end surface of the outer sleeve 123 is flush with the lower end surface of the step 124, the upper end surface of the outer sleeve 123 is higher than the upper end surface of the inner sleeve 122, a part of the outer sleeve 123 higher than the inner sleeve 122, the upper end surface of the inner sleeve 122 and the upper surface of the glass preform 2 enclose to form a second accommodating cavity, and the second accommodating cavity is used for placing the upper die 11. In the absence of the glass preform 2, the first and second receiving cavities are connected and form a "T" shaped cavity.
In the present embodiment, as shown in fig. 1, the lower end surface of the upper die 11 is a flat surface, and the upper end surface of the lower die 12 is provided with the molding surface 3; the upper mold 11 is a transparent upper mold 11, and the carbon dioxide laser 4 is provided above the upper mold 11 and can emit carbon dioxide laser light to the lower surface of the glass preform 2.
In this embodiment, the forming surface 3 may be provided on both the lower end surface of the upper die 11 and the upper end surface of the lower die 12; the upper die 11 and the lower die 12 are both arranged in a transparent structure (i.e., the upper die 11 is a transparent upper die, and the lower die 12 is a transparent lower die). Carbon dioxide lasers 4 are arranged above the upper die 11 and below the lower die 12. Two sets of carbon dioxide lasers 4 may also be placed on the same side of the molding die 1 (above the upper die 11 or below the lower die 12). Similarly, in actual operation, the upper end surface of the lower die 12 may be a plane, and the lower end surface of the upper die 11 may be provided with the forming surface 3; the lower mold 12 is a transparent lower mold 12, and the carbon dioxide laser 4 is provided below the lower mold 12 and can emit carbon dioxide laser light to the upper surface of the glass preform 2.
In this embodiment, the transparent lower mold or the transparent upper mold is made of a material having a low carbon dioxide laser absorption rate, a high carbon dioxide laser transmittance, a high melting point, a high strength, and a high hardness. Such as a transparent quartz glass material or crystalline silicon carbide. When only one of the upper mold 11 and the lower mold 12 needs to transmit light, only the upper mold 11 or the lower mold 12 that needs to be penetrated by the carbon dioxide laser is made of a transparent quartz glass material, crystalline silicon carbide, or the like.
Further, the present embodiment further includes a laser adjusting mechanism, the carbon dioxide laser 4 is mounted on the laser adjusting mechanism, so as to ensure that when the glass preform 2 with different thicknesses is formed, the carbon dioxide laser emitted by the carbon dioxide laser 4 can be focused on the lower surface of the glass preform 2 by adjusting the distance between the carbon dioxide laser 4 and the upper mold 11, and the forming surface (the surface in contact with the forming surface 3) of the glass preform 2 can be rapidly softened by heating in combination with the parameters such as the refractive index of the glass material itself and the like and by assisting in adjusting the emission power of the carbon dioxide laser 4. Above-mentioned laser instrument adjustment mechanism preferably adopts an existing adjustment mechanism, for example cylinder, electric telescopic handle and lead screw slider mechanism etc. under general condition, go up mould 11 level and arrange, the interval between 2 and the last mould 11 of carbon dioxide laser is the interval of vertical direction, so the interval between 2 and the last mould 11 of carbon dioxide laser is adjusted and can be called "vertical" and is adjusted, can realize that the mechanism that laser instrument adjustment mechanism "vertical" was adjusted is all applicable in this technical scheme of adaptability.
In this embodiment, the optical lens product 6 is a microlens array, and the forming surface 3 is an array of microlens concave surfaces that can match the shape of the microlens array. The microlens array is a conventional lens structure, and the detailed shape structure and operation principle thereof are not described herein.
In this embodiment, it is preferable that the lower mold 12 is stationary and the upper mold 11 is connected to a molding drive; the molding drive is used to drive the upper mold 11 toward or away from the lower mold 12. The molding drive may be a slider in an existing molding press, and drives the upper mold 11 toward or away from the lower mold 12.
The following describes the optical lens press molding method based on the above optical lens press molding apparatus, and specifically describes the method of molding a microlens array as an example. .
The first step is as follows: an upper die 11 and a lower die 12 are designed, firstly, the upper die 11 is a planar die core made of transparent quartz glass or crystal silicon carbide and the like, and the material of the upper die 12 has to meet the requirements of high melting point, high hardness and strength, high transparency and low carbon dioxide laser absorption rate; meanwhile, the lower die 12, especially the lower die core 121, should have good processability, the forming surface 3 on the upper end surface of the lower die can satisfy the concave surface shape (i.e. the concave surface array of the micro-lens) required by the micro-lens array forming, and the material does not react with glass and carbon dioxide laser. Carbon dioxide laser 4 is located above upper die 12.
The second step is that: the method comprises assembling transparent upper mold 11, glass preform 2, and lower mold 12 with microlens concave array (i.e. molding surface 3) together, then a carbon dioxide laser 4 is utilized to emit carbon dioxide laser from top to bottom, the carbon dioxide laser sequentially passes through the transparent upper die 11 and the upper layer part of the glass preform 2 and then is focused on the lower layer part of the glass preform 2, i.e., focused on the side of the glass preform 2 contacting the lower mold core 121, since the glass preform 2 is directly contacted with the lower mold core 121, the carbon dioxide laser can rapidly heat the entire lower surface of the glass preform 2 and the upper surface of the lower mold core 121, so that the upper surface of the lower mold core 121 and the lower surface of the glass preform 2 reach the press molding temperature, and the lower surface of the glass preform 2 is heated and softened into the softening layer 5; then, downward pressure is applied to the upper mold 11, the softened layer 5 of the glass preform 2 gradually fills the forming surface 3 on the upper end surface of the lower mold core 121 under the action of the pressure, the microlens concave array of the forming surface 3 is completely copied to the lower surface of the glass preform 2, and the glass preform 2 is molded to form the optical lens finished product 6. Finally, the carbon dioxide laser 4 is turned off, and the optical lens finished product 6 and the lower mold core 121 are rapidly cooled to the normal temperature state.
Because the unit depth of the micro-lens array is generally from several micrometers to hundreds of micrometers, the thickness of the glass preform 2 is from several millimeters to tens of millimeters, and the poor heat transfer performance of the glass material is considered, the local rapid heating of the press molding area of the glass preform 2 by the carbon dioxide laser effectively reduces the glass heating and softening time, meanwhile, the glass preform 2 and the molding surface 3 are rapidly pressurized after being heated to the softening temperature, the micro-lens array can be rapidly molded under the pressure, because the micro-lens array molding area (namely the unit depth) is very small and is only from tens of micrometers to hundreds of micrometers thick, the residual stress generated by the whole micro-lens array is very small and can be ignored and the change of the refractive index can be ignored during cooling, in summary, compared with the conventional integral heating and pressing forming method, the local rapid heating and pressing forming method provided by the embodiment has the advantages of high shape precision, low residual stress and high processing efficiency, is more suitable for ultra-precise pressing forming of the microlens array, can also be used for manufacturing other micro-nano optical lenses, such as fresnel lenses, micro-cylindrical lens arrays and the like, and is a forming device and a forming method with high precision and wide applicability.
It should be noted that the above-mentioned "finished optical lens product 6" is formed after the press molding process of the present embodiment, namely, referred to as "finished optical lens product 6", in order to distinguish the state from the glass preform 2, and is not a finished lens in the conventional sense. And after the optical lens finished product 6 is cooled, cutting the lower surface according to the thickness (different from several micrometers to several hundred micrometers) of the preset lens finished product to obtain a final micro-lens array finished product.
Example two
The present embodiment discloses another optical lens molding device, which is different from the first embodiment only in that the optical lens product 6 is a fresnel lens, and the molding surface 3 is an array of concentric concave surfaces capable of matching the shape of the fresnel lens. The fresnel lens is an existing lens structure, and the specific shape structure and the working principle are not described herein again.
EXAMPLE III
The present embodiment discloses another optical lens molding device, which is different from the first embodiment only in that the optical lens finished product 6 is a micro-cylindrical mirror array, and the molding surface 3 is an array of concave surfaces of the micro-cylindrical mirror that can match the shape of the micro-cylindrical mirror array. The micro cylindrical mirror array is an existing lens structure, and the specific shape structure and the working principle are not described herein again.
Example four
The embodiment provides a method for molding an optical lens, in particular to a method for realizing rapid molding of an optical lens by locally and rapidly heating carbon dioxide laser, which comprises the steps of emitting carbon dioxide laser to the contact position of a glass preform 2 and a molding surface 3 by utilizing the penetrability of the carbon dioxide laser, so that the molding surface 3 is heated and heated, and simultaneously heating and softening the surface of the glass preform 2, which is in contact with the molding surface 3, to form a softening layer 5; thereafter, the upper mold 11 and the lower mold 12 are brought close to each other, and the glass preform 2 is press-molded.
The molding surface 3 may be provided on the upper mold 11 or the lower mold 12, and one-side molding (a surface contacting the molding surface 3) of the glass preform 2 can be realized when the upper mold 11 and the lower mold 12 are brought close to each other. The forming surface 3 may be provided on both the upper mold 11 and the lower mold 12, and the glass preform 2 may be formed on both sides (both sides are in contact with the forming surface 3) in the process of the upper mold 11 and the lower mold 12 approaching each other.
In general, taking the press-molding of a microlens array as an example, since the depth of the unit of the microlens array is generally from several micrometers to several hundred micrometers, and the thickness of the glass preform 2 is from several millimeters to several tens of millimeters, considering the poor heat transfer performance of the glass material itself, the local rapid heating of the press-molding region of the glass preform 2 by the carbon dioxide laser effectively reduces the glass heat softening time, and the microlens array can be rapidly molded under pressure by rapidly pressurizing the glass preform 2 and the molding surface 3 after heating to the softening temperature, since the microlens array molding region (i.e., the aforementioned depth of the unit) is small and is only from several tens to several hundreds of micrometers thick, the residual stress generated by the entire microlens array is small because only the softening region generates the residual stress during cooling, and the residual stress generated by the other regions of the microlens array does not generate any residual stress, in conclusion, compared with the traditional integral heating and pressing forming method, the local rapid heating and pressing forming method provided by the embodiment has the advantages of high appearance precision, low residual stress and high processing efficiency, is more suitable for ultra-precise pressing forming of the micro-lens array, can also be used for manufacturing other micro-nano optical lenses, such as Fresnel lenses, micro-cylindrical lens arrays and the like, and is a high-precision and wide-applicability method.
Therefore, the optical lens mould pressing forming device provided by the technical scheme has a novel and reasonable structure, and utilizes the carbon dioxide laser to emit carbon dioxide laser towards the glass preform so as to locally and rapidly heat and soften the surface of the glass preform, which is in contact with the forming surface, to form a softening layer, and then mould pressing is carried out on the softening layer, so that the rapid mould pressing forming of the glass preform is facilitated. The optical lens mould pressing forming device does not need to heat and maintain pressure and anneal the whole body of the glass preform and the mould for a long time in the optical lens mould pressing forming process, the local rapid heating of the contact position of the glass preform and the forming surface is carried out by utilizing laser, and then the mould pressing forming is carried out rapidly, so that the problems that the appearance precision and the lower residual stress are ensured after the current optical lens is mould pressed and formed, the production efficiency is improved, and the service life of the mould is prolonged are solved.
In addition, according to the optical lens die forming method provided by the technical scheme, the contact position of the glass preform and the forming surface is locally and quickly heated by using carbon dioxide laser, and then the glass preform and the forming surface are quickly formed by die pressing, so that the quick die forming of the optical lens is realized, and the technical problems of low die forming efficiency, long production period and overlarge residual stress of the conventional optical lens are solved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An optical lens molding apparatus, comprising:
the mould pressing die comprises an upper die and a lower die, and the lower die is used for placing the glass preform; the lower end face of the upper die and/or the upper end face of the lower die are/is provided with forming surfaces which can be matched with the shape of the finished optical lens, and the upper die and/or the lower die are/is of a transparent structure;
and the carbon dioxide laser can emit carbon dioxide laser towards the glass preform so as to heat and soften the surface of the glass preform, which is in contact with the forming surface, to form a softening layer.
2. The optical lens molding apparatus according to claim 1, wherein said lower mold comprises:
the upper end surface of the lower mold core is used for placing the glass preform; the lower end of the lower mold core extends to the outer periphery to form a step;
the inner sleeve is sleeved on the periphery of the lower mold core and positioned on the step; the upper end surface of the inner sleeve is higher than the upper end surface of the lower mold core, the part of the inner sleeve higher than the lower mold core and the upper end surface of the lower mold core enclose to form a first accommodating cavity, and the glass preform is placed in the first accommodating cavity;
the outer sleeve, the outer sleeve cover is located the inner skleeve and the periphery of step, just the lower terminal surface of outer sleeve with the lower terminal surface parallel and level of step, the up end of outer sleeve is higher than the up end of inner skleeve, the outer sleeve is higher than the part of inner skleeve the up end of inner skleeve and the upper surface of glass preform encloses and closes formation second holding chamber, second holding intracavity is used for placing go up the mould.
3. The optical lens molding apparatus according to claim 1, wherein the lower end surface of said upper mold is a flat surface, and the upper end surface of said lower mold is provided with said molding surface; the upper die is a transparent upper die, and the carbon dioxide laser is arranged above the upper die and can emit the carbon dioxide laser to the lower surface of the glass preform.
4. The optical lens molding apparatus of claim 3, further comprising a laser adjustment mechanism on which said carbon dioxide laser is mounted to ensure focusing of said carbon dioxide laser on the lower surface of said glass preform by adjusting the spacing between said carbon dioxide laser and said upper mold.
5. An optical lens molding apparatus according to any one of claims 1 to 4, wherein the optical lens product is a microlens array, and the molding surface is an array of microlens concave surfaces that can match the shape of the microlens array.
6. The optical lens molding device according to any one of claims 1 to 4, wherein the optical lens is a Fresnel lens, and the molding surface is an array of concentric concave surfaces capable of matching the shape of the Fresnel lens.
7. The molding device for optical lenses according to any one of claims 1 to 4, wherein the finished optical lens is a micro-cylindrical mirror array, and the molding surface is an array of concave surfaces of the micro-cylindrical mirror array that can match the shape of the micro-cylindrical mirror array.
8. The optical lens molding apparatus according to claim 1, wherein said lower mold is stationary and said upper mold is connected to a molding drive; the mould pressing drive is used for driving the upper mould to be close to or far away from the lower mould.
9. A method for molding an optical lens, comprising the steps of:
s1, emitting a carbon dioxide laser beam to a contact position between the glass preform and the forming surface to heat and raise the temperature of the forming surface and soften the surface of the glass preform in contact with the forming surface;
and S2, making the upper die and the lower die close to each other to press-mold the glass preform.
10. An optical lens press-forming method completed based on the optical lens press-forming apparatus of claim 3, characterized by comprising the steps of:
s1, emitting carbon dioxide laser between the lower surface of the glass preform and the forming surface of the lower die to heat and raise the temperature of the forming surface and soften the lower surface of the glass preform;
and S2, making the upper die and the lower die close to each other to mold the glass preform and form the finished optical lens.
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| CN202210317736.6A CN114603762A (en) | 2022-03-29 | 2022-03-29 | Optical lens molding device and molding method |
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| CN202210317736.6A CN114603762A (en) | 2022-03-29 | 2022-03-29 | Optical lens molding device and molding method |
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