CN108562968A - Method and device for processing acrylic light guide plate - Google Patents

Abstract

The invention discloses a processing method and equipment of an acrylic light guide plate, which solves the problem of tiny scratches on the surface of the acrylic light guide plate in the prior art, and has the advantages of improving the quality of processed scattering dots and improving the optical performance of the light guide plate The effect, the scheme is as follows: a processing method and equipment of an acrylic light guide plate, including a processing method, in the laser processing process of the light guide plate, after laser processing the scattering dots, the processing technology of cleaning the first surface of the light guide plate with dichloromethane is added, Improve the yield of the light guide plate. Processing equipment, including adsorption system, laser system, conveying system and cleaning system, etc. The adsorption system includes the mechanism of adsorption platform, dovetail groove and rolling screw. The laser system includes the laser transmission path device, laser head and laser, etc. The cleaning system includes the cleaning liquid collection chamber and cleaning arm. The invention utilizes the cleaning process of adding dichloromethane to realize the elimination of tiny scratches on the light guide plate, thereby improving the production efficiency and the optical effect of the light guide plate.

Description

A processing method and device for an acrylic light guide plate

technical field

The invention relates to the technical field of light guide plates, in particular to the processing of acrylic light guide plates.

Background technique

Liquid crystal display (LCD) has become the mainstream of flat panel display. As a green lighting method, LED backlight is gradually becoming the standard configuration of LCD. With the development of light and thin, the production demand of light guide plate is increasing.

Performance parameters such as brightness and uniformity of the backlight module directly affect the image quality of a liquid crystal display (LCD). Liquid crystal displays have more and more stringent requirements in terms of brightness and chromaticity, so the requirements for backlight modules are also getting higher and higher. Light-emitting diode (LED) is a solid-state cold light source. It is the fourth generation of new light source after incandescent lamps, fluorescent lamps and high-intensity discharge (LED) lamps (such as high-pressure sodium lamps and metal halide lamps). It has high efficiency and pure light color. , low power consumption, long life, reliable and durable, and no pollution, LED is currently playing an important role in the market as a backlight source. The role of the light guide plate is to guide the scattering direction of light to improve the brightness and control the uniformity of the brightness. Therefore, the design and manufacture of the light guide plate is one of the key technologies of the backlight module. The size and density of the scattering dots in the light guide plate determine the brightness and uniformity of the output light.

At present, the materials used to make the light guide plate include polymethyl methacrylate, methyl methacrylate-styrene copolymer, etc., and then dots are made on the bottom surface of the light guide plate by printing or laser dotting. The manufacturing methods of the scattering dots of the light guide plate include mold forming method, ink printing method and laser processing method. Acrylic is currently the most used material for light guide plates. Acrylic light guide plates have many advantages: 1. The transparent plate is as clear and transparent as crystal, which is 200 times that of glass products, and there is almost no risk of breaking. 2. There are transparent, translucent, milky white and other colors and various surface effects. It is made of new polyester material, which is heat-curved or flat-edged. The metal base has a built-in light source, which has great visual impact. 3. Environmental protection, waste materials can be completely recycled, and recycling is simple and easy. Good light transmission performance, correspondingly reduce light source products, save electricity, and reduce use costs. 4. Excellent surface hardness and scratch resistance, the product has good protection for the built-in light source and prolongs the service life of the light source product. 5. Good chemical resistance, better than most other plastic materials. 6. Easy to clean, maintain, and ensure that the appearance of signboards and light boxes is as new all year round, with rational design, rainproof and moisture-proof, open structure, and easy maintenance. 7. Flame resistance: non-spontaneous combustion and self-extinguishing.

And laser processing is a non-contact processing method, which has the advantages of high energy, good directionality, high coherence, small heat-affected zone, etc., and is favored in the field of industrial processing.

Contents of the invention

The purpose of the present invention is to provide a processing method for an acrylic light guide plate, improve the quality of processed scattering dots, eliminate micro scratches on the surface of the acrylic light guide plate after processing, and improve the optical performance of the light guide plate.

In order to achieve the above object, the present invention provides a processing method of an acrylic light guide plate, which includes:

Provide an acrylic original plate, use a cutting machine and a molding machine to cut and shape the acrylic original plate to achieve the desired size and shape, the acrylic light guide plate has a first surface and a second surface corresponding to the first surface, and the light guide plate Scattering dots are processed on the first surface of the original plate, and the second surface generally has a V structure to enhance the scattering effect of the light guide plate;

Light guide plate dust removal, use a dust collector to remove dust from the light guide plate, after the light guide plate is dedusted, enter the dust-free laser processing workshop;

Processing scattering dots on the first surface of the acrylic light guide plate by means of laser processing;

Screen inspection, manually observe the macroscopic optical effect of the light guide plate through the screen inspection tool and observe whether there are problems such as leaks and scratches;

cleaning the first surface with dichloromethane;

Rinse the first surface of the acrylic light guide plate with a low concentration of ammonium nitrate;

Screen inspection, manual inspection of the dot quality of the light guide plate after cleaning;

Carry out sampling optical inspection on the processed and produced light guide plate;

Film-coated light guide plate;

Combined with the above processing methods, the processing equipment is as follows:

Light guide plate processing equipment includes laser system, adsorption system, conveying system and cleaning system. Among them, the laser system and the adsorption system are basically known. The laser system is mainly composed of laser, reflector and laser head. The adsorption system is mainly composed of adsorption platform, top block and motor.

The overall device is made of 45 steel, and the overall appearance is a cuboid. The laser system is set up on one side of the device. The laser emits laser light, and the light is reflected by the mirror and finally focused by the laser head to realize laser processing.

The laser processing cantilever is set in the middle of the device. The laser head is driven by a linear motor and moves along the laser processing arm. An adsorption platform is set up under the laser processing arm. The adsorption platform realizes the feed movement of the light guide plate through the motor-driven rolling screw, and the adsorption platform is equipped with The dovetail groove ensures the movement accuracy of the adsorption platform.

The other side of the adsorption platform is the transmission system and the cleaning system. The transmission system is composed of six uniformly distributed transmission mechanisms. The cleaning system is mainly composed of a cleaning arm and an inclined platform. The cleaning arm is equipped with uniformly distributed small holes. Chemically clean the light guide plate.

The beneficial effects of the present invention are:

1. Provide a method for processing acrylic light guide plates that can be mass-produced. The production efficiency is high, the quality of the light guide plates produced is high, and the production pass rate is improved compared with traditional processes.

2. This process includes chemical cleaning, which can corrode the recast layer formed by dotting the light guide plate, reduce the crater, and improve the overall optical effect of the light guide plate.

3. Chemical cleaning can remove some tiny scratches and improve the overall quality of the light guide plate, that is, the production qualification rate of the light guide plate is improved.

4. The device is simple, the cost is low, and the qualified rate of finished products of the light guide plate is high, and the quality of the finished product of the light guide plate is significantly improved.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative labor. in:

Fig. 1 is the flow chart of the processing method of a kind of acrylic light guide plate of the present application in one embodiment;

Fig. 2 is the overall appearance drawing of device;

Fig. 3 is the appearance diagram of shelling;

Fig. 4 is a top view of the device;

In Fig. 3, 3-1 inclined plane, 3-2 Y direction moving rod, 3-3 retaining groove, 3-4 Z direction moving rod, 3-5 mechanism support, 3-6 cylindrical roller, 3-7 cylinder, 3- 8 reflection cavity, 3-9 laser head, 3-10 dust removal port

In Fig. 4, 4-1 leakage hole, 4-2 transmission mechanism, 4-3 transmission mechanism, 4-4 cleaning arm, 4-5 adsorption platform, 4-6 top block, 4-7 processing arm, 4-8 motor , 4-9 dovetail groove, 4-10 laser, 4-11 cylinder, 4-12 reflective cavity, 4-13 transmission mechanism, 4-14 transmission mechanism, 4-15 transmission mechanism, 4-16 transmission mechanism.

Detailed ways

In order to make the above objects, features and advantages of the present invention more comprehensible, the invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Referring to FIG. 1 , FIG. 1 is a flow chart of an embodiment of a processing method for an acrylic light guide plate of the present application. The method described in Figure 1 comprises the steps:

Step 1 provides an acrylic original plate, the acrylic original plate has a first surface and a second surface corresponding to the first surface;

Step 2: Cut and shape the original acrylic plate with a cutting and forming machine to achieve the expected shape and size;

Step 3 Dedust the acrylic light guide plate;

Step 4 Draw the dot distribution map of the light guide plate and input it to the laser dotting equipment;

Step 5: Laser dotting the first surface of the acrylic original plate with a laser;

Step 6 cleaning the first surface with dichloromethane;

Step 7 rinsing the first surface with a low concentration of ammonium chloride;

Step 8 picture detection;

Step 9 film-coated packaging;

The equipment combined with the light guide plate processing method includes adsorption system, laser system, transmission system and cleaning system, etc. Figure 3 is the overall appearance of the shell removal device. As shown in the figure, from left to right, there are cleaning system, conveying system, adsorption system and laser system.

The laser system mainly includes 3-7 cylinders, 3-8 reflective cavities, 3-9 laser heads in Figure 3, 4-10 lasers, 4-11 cylinders, 4-12 reflective cavities in Figure 4, and 4-12 reflective cavities in Figure 4. 10 The laser emits laser light through the 4-11 cylinder and is reflected by the reflector in the 4-12 reflection cavity, and the light path changes. It passes through the 3-7 cylinder in Figure 3 and is reflected by the 3-8 reflection cavity, and finally at the 3-9 laser head Focusing realizes laser processing.

The adsorption system mainly includes 4-5 adsorption platforms in Figure 4, 4-6 top blocks, 4-8 motors, and 4-9 dovetail grooves. The 4-8 motor drives the rolling screw to cooperate with the bottom side of the adsorption platform, and drives the adsorption platform to move along the 4-9 dovetail groove, wherein the 4-6 top block can realize the rise and fall of the light guide plate.

The transmission system mainly includes six transmission mechanisms, which are respectively 4-2, 4-3, 4-13, 4-14, 4-15, and 4-16 in Figure 4. The 4-2 transmission mechanism in Figure 4 realizes the guide The lifting of one side of the light plate, the 4-3 transmission mechanism realizes the transmission of the light guide plate. 4-2 The structure of the transmission mechanism is mainly composed of the 3-2Y moving rod in Figure 3, the 3-3 top block, the 3-4Z moving rod, and the 3-5 mechanism bracket. The movement of the moving rod is realized by a linear motor, as shown in Figure 4 The 4-3 transmission mechanism is basically the same as the 4-2 transmission mechanism, the only difference is that the 3-3 top block in Figure 3 in the 4-3 transmission mechanism is replaced by a 3-6 cylindrical roller, and the cylindrical roller is driven by a motor Rotate, when in contact with the light guide plate, realize the transmission of the light guide plate. And as shown in Figure 4. The other side of the device corresponding to the 4-2 mechanism is equipped with a 4-16 transmission mechanism that is exactly the same as the 4-2 mechanism, and the mechanism that is exactly the same as the 4-3 mechanism is provided with three 4-13, 4- 14, 4-15.

The cleaning system mainly includes the 3-1 inclined plane in Figure 3 and the 4-1 round hole in Figure 4, the 4-4 cleaning arm, and the 4-1 round hole is set at the lowest position of the 3-1 inclined plane. When the light guide plate is transported to the designated position, the evenly distributed small holes on the cleaning arm spray out the cleaning liquid to realize the cleaning of the light guide plate. After cleaning, the liquid flows through the slope 1 to the lowest position of the slope. At this time, the liquid flows through the slope 4 in Figure 4. -1 small hole flows to the inner cavity of the device, and the collected liquid can be reused.

Further, the acrylic original plate is selected, the acrylic original plate has a first surface and a second surface corresponding to the first surface, the acrylic original plate is an acrylic plate with a certain thickness, and the first surface is a smooth surface, The second surface generally has a V structure to better realize the refraction of light by the light guide plate.

Further, a laser is used to make dots on the first surface of the acrylic original plate. Since the method of using the laser is known, it will not be repeated here. Through step 5, the dot depth on the acrylic original board can be adjusted and controlled during laser dotting according to production requirements.

Further, clean the first surface of the acrylic light guide plate with dichloromethane, prepare dichloromethane, the mass concentration of the dichloromethane is 15% (make sure the mass concentration of dichloromethane is between 5%-25%) ). Dichloromethane reacts with the recast layer of the crater to reduce the height of the crater, improve the dot quality, and further improve the overall optical performance of the light guide plate, and cleaning can remove some tiny scratches to improve the quality of the light guide plate.

Further, the dichloromethane on the surface of the acrylic light guide plate is washed away with low-concentration ammonium chloride, so as to prevent the continued chemical reaction between the dichloromethane and the light guide plate, corrode the light guide plate, and affect its optical performance.

The specific processing process of the device is as follows: the original light guide plate is placed on the 4-5 adsorption platform in Figure 4, the 4-8 motor starts to drive the rolling screw to rotate, the 4-5 adsorption platform moves and the rolling screw cooperates to realize the adsorption platform At this time, the laser system starts, and the laser head 3-9 in Figure 3 is driven by a linear motor to reciprocate to realize the processing of the light guide plate. After the processing is completed, the top block 4-6 in Figure 4 rises to hold up the light guide plate, and the four transmission mechanisms 4-3, 4-13, 4-14, and 4-15 in the transmission system close to the adsorption platform are activated, and the transmission mechanism The movement of the Y-direction moving rod of the transmission mechanism drives the four cylindrical rollers of the transmission mechanism to move to the bottom side of the light guide plate, and moves to a suitable position. The rollers rotate to drive the light guide plate to move to the cleaning system. When one side of the light guide plate touches the top block of the 4-2 transmission mechanism, all the transmission mechanisms stop, and the four transmission mechanisms 4-2, 4-3, 4-15 and 4-16 move the Z-direction rod downwards, making the light guide plate tilt to one side. At this time, the cleaning system is turned on, and the cleaning liquid is sprayed on the cleaning arm. The cleaning liquid cleans the light guide plate and finally flows into the collection box. After cleaning, remove the light guide plate.

Example:

The processing method of the light guide plate combined with the processing of the equipment includes the following steps:

Step 1 provides an acrylic original plate, the acrylic original plate has a first surface and a second surface corresponding to the first surface;

Step 2: Cut and shape the original acrylic plate with a cutting and forming machine to achieve the expected shape and size;

Step 3 Dedust the acrylic light guide plate;

Step 4 Draw the dot distribution map of the light guide plate and input it to the laser dotting equipment;

Step 5 Place the light guide plate on the adsorption platform, turn on the laser, and start laser processing;

Step 6: After the laser processing is completed, the processed light guide plate is transferred to the cleaning system by the transfer system;

In step 7, the cleaning system cleans the first surface with dichloromethane;

In step 8, the light guide plate is removed, and the operator rinses the first surface with low-concentration ammonium chloride;

Step 9 picture detection;

Step 10 film-coated packaging;

Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the present invention can be Modifications or equivalent replacements of the technical solutions without departing from the reviewed scope of the technical solutions of the present invention shall be covered by the scope of the claims of the present invention.

Claims (9)

1. a kind of processing method and equipment of acrylic light guide plate, which is characterized in that including:Scattering netted dot technique is laser machined, Light guide plate raw sheet is provided first, light guide plate raw sheet is processed to desired size by cutting and forming machine, laser adds after light guide plate dedusting The first surface of work light guide plate machines and carries out image quality inspection, then carries out dichloromethane and cleans first surface, then First surface is rinsed with low concentration ammonium nitrate, overlay film is packed after being examined eventually by picture；The equipment of scattering netted dot is laser machined, It is characterised in that it includes light guide plate, light guide plate adsorption locating device, laser-processing system and cleaning system three are built in successively In rack.

2. a kind of processing method of acrylic light guide plate according to claim 1, which is characterized in that in processing technology, swash After light processing scattering netted dot light guide plate first surface is cleaned with dichloromethane.

3. a kind of process unit of acrylic light guide plate according to claim 1, which is characterized in that the light guide plate absorption Device includes vacuum absorbing platform and dovetail groove transmission mechanism, and oat tail groove structure ensures absorption platform kinematic accuracy.

4. a kind of process unit of acrylic light guide plate according to claim 1, which is characterized in that the laser processing system System includes laser, laser emission path and process arm.

5. a kind of process unit of acrylic light guide plate according to claim 4, which is characterized in that the laser transmits road Change laser emission path using mirror-reflection in diameter.

6. a kind of process unit of acrylic light guide plate according to claim 4, which is characterized in that the laser processing arm It is equipped with blowing mouth, removes the residue generated when light guide plate processing.

7. a kind of process unit of acrylic light guide plate according to claim 1, which is characterized in that the cleaning system packet Cleaning solution collecting chamber, cleaning arm and transmission device are included, has aperture, cleaning solution to be flowed out from aperture on cleaning arm, cleans light guide plate.

8. a kind of process unit of acrylic light guide plate according to claim 7, which is characterized in that the card cleans sloping platform It is equipped with aperture, wash liquid stream is finally collected through aperture in cleaning solution collecting chamber.

9. a kind of processing technology of acrylic light guide plate according to claim 1 and the application method of equipment, feature exist In including the following steps：

1）Acrylic raw sheet is provided, the acrylic raw sheet has first surface and the second table corresponding with the first surface Face；

2）By cutting, molding machine acrylic master is carried out to cut molding, reach intended form size；

3）Acrylic light guide plate dedusting；

4）Light guide plate mesh point distribution map is drawn, laser dotting equipment is input to；

5）Light guide plate is placed on absorption platform, laser is opened, starts to laser machine；

6）Laser processing completes that the light guide plate after processing is sent to cleaning system by conveyer system；

7）Cleaning system cleans the first surface with dichloromethane；

8）Light guide plate is removed, operator rinses the first surface with low concentration ammonium chloride；

9）Picture detects；

10）Overlay film is packed.