CN107738462A - Fly-eye lens array forming device - Google Patents

Abstract

A fly-eye lens array forming device includes a hot-press forming system, a cold-press forming system, a fly-eye lens array forming combined mold, a mold moving device, a high-pressure air injection system and an electrical control system. The hot pressing forming system is equipped with a platen mechanism capable of hot pressing, maintaining pressure and heat preservation in sections; the cold pressing forming system is equipped with a refrigeration circulating water system, which can quickly cool down the combined mold in the pressing plate; the combined mold is equipped with a positioning device and a handle, It has the characteristics of easy disassembly and assembly; the mold moving device is equipped with brackets and rollers to facilitate the push/translation/extraction of the combined mold; the equipment and devices set in the high-pressure air injection system can provide clean and dry high-pressure gas; the electrical control system is used for setting The time and temperature of the upper and lower platen clamping, pressure holding and demoulding of the fixed molding system. The invention can obtain a fly-eye lens array product with a uniform spherical surface and a mirror surface standard.

Description

A fly-eye lens array forming device

technical field

The invention belongs to the technical field of optical equipment, and relates to a fly-eye lens array forming device.

Background technique

In the projection display lighting system, a lens array composed of a series of identical small convex lenses shaped like fly eyes is used to obtain lighting with high utilization rate of light energy and high uniformity, thereby improving the overall optical performance of the system. The specific embodiment is that the lamp is placed on the focus of the parabolic reflective bowl, and the light emitted by the lamp, that is, the wide beam, is reflected by the parabola and is similar to parallel light projected on the first group of fly-eye lens arrays. A plurality of filament images, i.e. thin beams, are formed on the second group of fly-eye lens arrays, and the condenser behind it superimposes the plurality of filament image beams and evenly illuminates the liquid crystal panel. Since the entire wide beam is divided into multiple thin beams for illumination, the uniformity of each thin beam must be greater than the uniformity within the entire wide beam range. At this time, the thin beams at symmetrical positions are superimposed on each other, making the fine unevenness of the thin beams Therefore, the use of two fly-eye lens arrays in the lighting system can improve the uniformity of lighting. It can be seen that the small lenses in the array split the wide beam into thin beams, which determines that the number cannot be too small, and the diameter cannot be too large. Therefore, the fly-eye lens array has a large number of small lenses, large dimensions, complex structure, and difficult processing. And other characteristics, the existing processing technology is technically difficult to realize.

At present, there are three main methods of optical lens processing technology: the first is optical cold processing method, optical glass materials are processed through key processes such as rough grinding, fine grinding, and polishing. This method cannot process complex structures densely packed with small lenses. The second is the glass forming method, which is to put the molten glass in a special precision mold, and go through the upper mold, heating, pressurizing, cooling, lower mold and other processing processes. This kind of method has harsh process conditions and complicated process steps, especially It is the contact between the surface of the mold and the high-temperature molten glass, which will greatly affect the precision and life of the lens. For the processing of larger-sized fly-eye lens arrays, technical defects still cannot be overcome. The third is the injection molding method. The molten optical plastic is injected into the mold through the nozzle of the molding machine, and the fly-eye lens array can be realized through the processes of mold closing, heating, pressurization, pressure maintaining, mold opening, and demoulding. Precision machining, but due to the limitation of the process, the size of the molding machine and the mold is restricted, and the molding quality requirements cannot solve the problem of forming a large-sized fly-eye lens array.

Contents of the invention

The technical problem to be solved by the present invention is: the fly-eye lens array has the characteristics of a large number of small lenses, large external dimensions, and complex structure, and the existing processing technology cannot meet the processing requirements of the fly-eye lens array.

The technical solution of the present invention is: a fly eye lens array forming device, including a hot press forming system, a cold press forming system, a fly eye lens array combined mold, a mold moving device, a high-pressure air injection device and an electrical control system, and a hot press forming system , cold press molding system and high-pressure air injection device are arranged next to the mold moving device in turn, and the fly-eye lens array combined mold moves through the mold moving device. Push into the hot-press forming system or cold-press forming system for press-molding, pull out the hot-press forming system or cold-press forming system after forming, and continue to move through the mold moving device, the electrical control system is used to Temperature, pressure and time signals of molding system and high-pressure air injection device.

The hot pressing forming system includes a hot pressing device, an electric heating device and a temperature measuring device. The hot pressing device includes a hot pressing upper platen, a hot pressing guide column, a hot pressing lower pressing plate, a hot pressing hydraulic control system and a hot pressing base. The upper platen is fixed on the hot-pressing base through the hot-pressing guide column, and the hot-pressing lower platen is sleeved on the hot-pressing guide post. There is a space for hot-pressing forming between the upper and lower pressing plates. The pressing plate rises and falls at a constant speed along the hot-pressing guide column, and the lower pressing plate is provided with a limit device, which is used to limit the stroke of the lower pressing plate; The temperature measuring device, the electric heating device and the temperature measuring device are respectively connected with the electrical control system.

The cold press forming system includes a cold press device, a cooling device and a temperature measuring device. The cold press device includes a cold press upper press plate, a cold press guide post, a cold press lower press plate, a cold press hydraulic control system and a cold press base. The pressing plate is fixed on the cold pressing base through the cold pressing guide column, and the cold pressing lower pressing plate is sleeved on the cold pressing guide column. There is a cold pressing forming space between the cold pressing upper and lower pressing plates, and the cold pressing hydraulic control system drives the cold pressing lower pressing plate. Rising and descending at a constant speed along the cold pressing guide column, the lower pressing plate of cold pressing is provided with a limit device, which is used to limit the stroke of the lower pressing plate of cold pressing; the upper pressing plate of cold pressing and the lower pressing plate of cold pressing are respectively equipped with cooling device and temperature measurement device, the cooling device is a cold water pipe, and the temperature measuring device is connected with the electrical control system.

Further, the cold water pipes in the upper and lower platens of the cold press respectively include a water inlet pipe and a water outlet pipe, the water inlet pipe is connected with the water outlet pipe of the refrigerator, the water outlet pipe is connected with the water inlet pipe of the refrigerator, and the refrigerator is connected with the cold water pipe Form a closed water circulation system.

The fly-eye lens array combination mold is sequentially composed of a lower supporting plate, a diffusion plate, a lower template, an upper template, a diffuser plate and an upper cover plate from bottom to top, the fly-eye lens array material is filled between the lower template and the upper template, and the bottom A mold positioning device and a handle are arranged on the outside of the supporting plate, the positioning device is used to limit the position where the fly-eye lens array combination mold is pushed into the hot-press forming system or the cold-press forming system, and the handle is used to push and pull the fly-eye lens array combination mold; the upper template 1. The contact surface between the lower template and the fly-eye lens array material meets the requirement of a mirror surface, the contact surface of the upper template adopts a plane polishing process, the contact surface of the lower template adopts a spherical polishing process, and the polished surface of the template is plated with nickel, and the fly-eye lens array material is optical plastic.

As a preferred manner, the mold moving device is an unpowered roller conveyor belt.

Described high-pressure air injection device comprises air compressor, air storage tank, air filter system, air injection device and pipeline, and air filter system comprises air drier and air filter, air compressor, air storage tank, air filter system and air injection device Connected by tubing.

The invention provides a fly-eye lens array molding device, which places a polymer plate with good light transmission performance, such as polymethyl methacrylate, in a fly-eye lens array composite mold, and the composite mold passes through a moving device in a hot press molding system and After being formed separately in the cold press forming system, it is moved to the high-pressure air injection system to be demolded with the assistance of clean high-pressure gas, and finally the fly-eye lens array product is obtained.

The fly-eye lens array forming device of the present invention has the functions of hot pressing and cold pressing the optical plastic polymer plate, and the optical plastic is sequentially hot pressed, cold pressed, and demolded in the mold to obtain a uniform spherical surface that reaches the mirror surface standard. Fly's Eye Lens Array Products. Under the control signal of the electrical control system, the hot pressing forming system of the device of the present invention can realize hot pressing, pressure maintaining and heat preservation in different temperature sections, and can meet the requirements for hot pressing forming of optical plastic plates, the set pressure, temperature and time A reasonable solution can be selected according to actual needs; the cold press forming system is equipped with a structure that quickly cools down the combined mold in the press plate through refrigerated circulating water, which meets the requirements of optical plastics being solidified to the glass state after hot pressing; fly-eye lens array combined mold The structure of the lens ensures the accuracy of the lens, and the mold moving device can conveniently carry out the moving operation of the mold. The structure of the fly-eye lens array combination mold also has the characteristics of easy decomposition and easy assembly; the high-pressure air injection system of the device of the present invention is used to provide clean and dry High-pressure gas assists the fly-eye lens array product to be taken out of the fly-eye lens array combination mold, and the high-pressure gas assists the fly-eye lens to detach from the mold, which can greatly reduce the probability of damage to the lens. The above process has no restrictions on the size of the hot press forming system and the cold press forming system, and the size of the mold. The mold setting meets the precision requirements. The device of the present invention is suitable for the production of fly-eye lens array products with relatively large specifications and high precision requirements. The production efficiency is high, the operation is convenient, the process is stable, the consistency of the product quality is good, and the beneficial technical effect can be produced to meet the user's scientific research and production needs.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the device of the present invention.

Fig. 2 is a schematic diagram of the hot press forming system and the cold press forming system of the device of the present invention.

Fig. 3 is a schematic cross-sectional view of the combined mold of the fly-eye lens array of the device of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the overall structure of a fly-eye lens array forming device of the present invention, and Fig. 2 is a schematic diagram of a hot-press forming system and a cold-press forming system in the device. The device of the present invention includes a hot press forming system 10, a cold press forming system 20, a fly-eye lens array combined mold 50, a mold moving device, a high-pressure air injection device and an electrical control system, a hot press forming system 10, a cold press forming system 20 and a high-pressure air injection system. The devices are arranged next to the mold moving device in turn, and the fly-eye lens array combined mold 50 is moved by the mold moving device, and when passing through the hot-press forming system 10 or the cold-press forming system 20 during the movement, the fly-eye lens array combined mold 50 is pushed into the hot press The forming system 10 or the cold pressing forming system 20 performs press molding, and after forming, the hot pressing forming system 10 or the cold pressing forming system 20 is pulled out, and continues to move through the mold moving device. Temperature, pressure and time signals of molding system and high-pressure air injection device.

The movement of the mold moving device is an unpowered roller conveyor belt. In this embodiment, the mold moving device includes a mold moving bracket 301, on which the mold moving bracket 301 is equipped with rollers 302, and each roller 302 is made of a stainless steel tube, 2 bearings and 1 shaft. The parts form a roller type roller, and the two ends of the roller 302 shaft pass through the round holes in the guide rails on both sides of the mold moving support 301 and are fixed with nuts to obtain a non-powered roller conveyor belt.

The high-pressure air injection system includes an air compressor 401, an air storage tank 402, an air filter system 403, an air injection device 404 and pipelines. The air filter system 403 includes an air dryer and an air filter. road connection.

Fig. 2 shows an embodiment of a thermocompression forming system 10, including a thermocompression device, an electric heating device and a temperature measuring device. The hot pressing device is composed of hot pressing upper platen 101, hot pressing guide column 102, hot pressing lower pressing plate 103, hot pressing hydraulic pressure control system 104, hot pressing base 105 and limit device. The hot-press upper platen 101 is fixed, and the hot-press lower platen 103 is set on four hot-press guide columns 102 and connected with the hot-press hydraulic control system 104. The hot-press lower platen 103 rises at a constant speed under the action of the hot-press hydraulic control system and down, the space between the hot pressing upper and lower pressing plates is the hot pressing forming space. The stroke of the hot pressing lower platen 103 is controlled by the photoelectric sensor in the limit device, specifically: the photoelectric sensor is connected to the hot pressing hydraulic control system 104, and controls whether the hydraulic control system stops driving the hot pressing lower pressing plate according to the induction signal. The hot-pressed upper platen 101 and the hot-pressed lower platen 103 are made of alloy steel materials with good heat transfer performance and high hardness, such as A3 and A5 alloy steels. The hot-pressed upper platen 101 and the hot-pressed lower platen 103 are respectively equipped with 7 electric heaters Rods 106 and temperature measuring devices, seven electric heating rods 106 are connected in parallel to the electrical control system, the temperature measuring devices are connected to the electrical control system, and the electrical control system can precisely control the temperature of the pressing plate through the electric heating rods 106 .

When the hot press forming system is working, the combined mold is placed on the lower platen, and the hydraulic control system is activated to make the lower platen rise at a constant speed. The combined mold bears the set pressure between the upper and lower platens. The heating function realizes the heating and heat preservation of the upper and lower platens, and achieves the effect of precisely controlling the temperature of the combined mold.

Fig. 2 also shows an embodiment of a cold press forming system 20, which includes a pressure device, a cooling device and a temperature measuring device. The cold pressing device is composed of a cold pressing upper platen 201, a cold pressing guide column 202, a cold pressing lower pressing plate 203, a cold pressing hydraulic control system 204, a cold pressing base 205 and a limit device. The structure, material and working principle of the cold press device of the cold press forming system are the same as those of the hot press device of the above hot press forming system. The cold-press upper platen 201 and the cold-press lower platen 203 are respectively equipped with 7-way cold water pipes 206 with a diameter of 12 mm and uniformly arranged, and the upper and lower plates are equipped with temperature measuring devices, and the 7-way cold water pipes 206 in each plate are connected end to end , the water inlet pipe is connected to the water outlet pipe of the refrigerator 21, and the water outlet pipe is connected to the water inlet pipe of the refrigerator 21. The refrigerating circulating water of machine 21 quickly reduces the temperature of the upper and lower platens in a relatively short period of time, and then quickly cools down the combined mold between the platens. The precise measurement of the temperature of the upper and lower platens is completed by the temperature measuring device installed in the plate. The measuring device is connected with the electrical control system.

The combined mold 50 for the fly-eye lens array is pushed and pulled out on the pressing plate 103 under hot pressing or the pressing plate 203 under cold pressing. Therefore, the overall installation standard of the mold moving bracket is that the highest point of the outer circle of the roller is flush with the upper surface of the lower platen in the pressure device of the hot-press forming system and the cold-roll forming system, so that the combined mold can be pushed in/translated/drawn smoothly without any problems. any purpose of hindrance.

Fig. 3 has shown the mold 50 of fly-eye lens array of the device of the present invention, comprises lower supporting plate 501, diffusion plate 502, lower formwork 503, upper formwork 504, diffusion plate 502 and upper cover plate 505, lower formwork 503 and upper formwork 504 Between them is a fly-eye lens array plate 601 . In order to prevent the upper and lower platens of the molding system from being in direct contact with the upper and lower templates of the core parts in the composite mold, a diffuser plate and an upper cover plate with high conductivity are added between the template and the presser plate to ensure the molding of the template and the fly-eye lens array sheet uniform temperature and pressure. As a preferred embodiment, the lower supporting plate 501 of the composite mold is provided with a positioning device and a handle, the lower supporting plate 501 and the upper cover plate 505 are made of stainless steel, and the material of the diffusion plate 502 has high temperature resistance, excellent uniform conductivity and elasticity , such as carbon fiber composite materials, the material of the lower template 503 and the upper template 504 is carbon tool steel or alloy tool steel, and the polished surface that they contact with the fly-eye lens array plate 601 must meet the requirements of the mirror surface. The upper template 504 adopts a flat polishing process, and the lower The template 503 adopts multiple sets of concave spherical polishing processes, and the polished surface of the template is plated with nickel. The fly-eye lens array plate 601 is a polymer plate with good light transmission performance, such as polymethyl methacrylate, and the finished product obtained by the final mold has a light-transmitting plane on one side and an array of multiple sets of identical small convex lenses on the other side.

The electrical control system includes a hydraulic control unit, a forming system platen temperature control unit, and a time control unit. The hydraulic control unit is used to set the clamping pressure of the forming system platen in sections; the platen temperature control unit is used to set the temperature of the upper and lower platens. , and realize the heat preservation function according to the feedback of the temperature measuring device; the time control unit is used to set the clamping, holding and demoulding time of the pressing plate of the molding system. In the invention, the segmental pressure, temperature, pressure holding and demoulding time of the upper and lower pressing plates in the hot pressing and cold pressing forming system are set through the electric control system.

The present invention adopts the combination mode of the fly-eye lens array mold, and a mold positioning device is arranged on the lower supporting plate, and the diffusion plate, the lower mold plate, the fly-eye lens array plate, the upper mold plate, the diffusion plate and the upper cover plate are placed in sequence. On the lower pallet, it is easy to decompose and easy to assemble; use the handle of the lower pallet to push the combined mold from the rollers on the mold moving bracket to the lower platen of the thermocompression forming system, and the lower platen and combined mold rise at a constant speed under the action of the hydraulic control system , until the lower platen and upper platen pressurize the combined mold in sections. At this time, the temperature of the upper and lower platens is raised by the electric heating device. Descend to the starting position, the combined mold is pulled out from the lower platen, and translates to the cold forming system on the rollers, pushes the combined mold into the lower platen of the cold forming system and then rises at a constant speed until the lower platen and the upper platen meet the mold Segmented pressurization, since the water pipes inside the upper and lower platens and the external refrigerator form a closed water circulation cooling system, when the temperature of the combined mold drops to room temperature, the lower platen drops to the starting position at a uniform speed, and the combined mold is pulled out and translated to high pressure The position of the air injection system, the air compressor of the high pressure air injection system produces 0.75Pa high-pressure gas, which is stabilized by the air storage tank, dehumidified, degreased, and impurity removed by the air filtration system. board, upper template and fly-eye lens array products, and then put the new fly-eye lens array board on the lower template, and then place them layer by layer to complete the new mold combination, and repeat the above process for the cyclic production of the next product.

The invention provides a fly-eye lens array forming device, which can obtain a fly-eye lens array product with a uniform spherical surface and a mirror surface standard.

Claims (7)

1. A fly-eye lens array forming device, characterized in that it comprises a hot-press forming system, a cold-press forming system, a fly-eye lens array combination mold, a mold moving device, a high-pressure jet device and an electrical control system, a hot-press forming system, a cold press The compression molding system and the high-pressure air injection device are arranged next to the mold moving device in turn, and the fly-eye lens array combined mold is moved by the mold moving device. The hot press forming system or cold press forming system is used for press molding. After forming, the hot press forming system or cold press forming system is drawn out and continues to move through the mold moving device. And the temperature, pressure, and time signals of the high-pressure jet device. 2. A kind of fly-eye lens array molding device according to claim 1, characterized in that said thermocompression molding system includes a thermocompression device, an electric heating device and a temperature measuring device, and the thermocompression device includes a thermocompression upper platen, a thermal Pressing guide column, hot pressing lower platen, hot pressing hydraulic control system and hot pressing base, the hot pressing upper platen is fixed on the hot pressing base through the hot pressing guide post, the hot pressing lower pressing plate is sleeved on the hot pressing guide post, and the hot pressing Between the upper and lower platen is the space for hot-press forming. The hot-press hydraulic control system drives the hot-press lower platen to rise and fall at a constant speed along the hot-press guide column. There is a limit device on the hot-press lower platen. The stroke of the lower platen; the electric heating device and the temperature measuring device are respectively arranged in the hot pressing upper pressing plate and the hot pressing lower pressing plate, and the electric heating device and the temperature measuring device are respectively connected with the electric control system. 3. A kind of fly-eye lens array forming device according to claim 1, characterized in that said cold press forming system comprises a cold press device, a cooling device and a temperature measuring device, and the cold press device comprises a cold press upper platen, a cold press The guide post, the cold pressing lower platen, the cold pressing hydraulic control system and the cold pressing base, the cold pressing upper pressing plate is fixed on the cold pressing base through the cold pressing guide post, the cold pressing lower pressing plate is sleeved on the cold pressing guide post, the cold pressing upper pressing plate is , Between the lower platen is the cold-press forming space. The cold-press hydraulic control system drives the cold-press lower platen to rise and fall at a constant speed along the cold-press guide column. The cold-press lower platen is equipped with a limit device, which is used to limit the The stroke of the pressing plate; the cold pressing upper pressing plate and the cold pressing lower pressing plate are provided with a cooling device and a temperature measuring device respectively, the cooling device is a cold water pipe, and the temperature measuring device is connected with the electrical control system. 4. A forming device for a fly-eye lens array according to claim 3, wherein the cold water pipes in the upper and lower pressing plates of the cold press respectively comprise a water inlet pipe and a water outlet pipe, and the water inlet pipe is connected to the water outlet pipe of the refrigerator. The outlet pipe is connected to the water inlet pipe of the refrigerator, and the refrigerator and the cold water pipe form a closed water circulation system. 5. A forming device for fly-eye lens array according to claim 1, characterized in that the combined mold of fly-eye lens array from bottom to top is a lower supporting plate, a diffuser plate, a lower die plate, an upper die plate, a diffuser plate and an upper cover The board, the lower template and the upper template are used to fill the fly-eye lens array material, and the mold positioning device and handle are arranged on the outside of the lower supporting plate, and the positioning device is used to limit the fly-eye lens array. The position of the molding system, the handle is used to push and pull the fly-eye lens array combination mold; the contact surfaces of the upper template, the lower template and the fly-eye lens array material meet the requirements of the mirror surface, the contact surface of the upper template adopts a flat polishing process, and the contact surface of the lower template adopts a spherical surface Polishing process, and the polished surface of the template is nickel-plated, and the material of the fly-eye lens array is optical plastic. 6. A fly-eye lens array molding device according to claim 1, characterized in that the mold moving device is a non-powered roller conveyor. 7. A kind of fly-eye lens array forming device according to claim 1, characterized in that the high-pressure air injection device includes an air compressor, an air storage tank, an air filter system, an air injection device and pipelines, and the air filter system includes an air dryer And air filter, air compressor, air storage tank, air filtration system and air injection device are connected through pipelines.