CN111703624B - A lens and its processing method - Google Patents

Abstract

The invention relates to the technical field of lens coating, in particular to a lens and a processing method thereof, wherein the processing method comprises the following steps: (S1), taking the formed plate for standby; (S2) attaching first protective films to the front and back surfaces of the formed plate; (S3) tearing off the first protective film on the front surface of the formed plate, and then sequentially attaching a second protective film and a third protective film on the front surface of the formed plate; (S4) carrying out CNC cutting on the formed plate obtained in the step (S3) to form a plurality of uniformly distributed semi-finished products; (S5), cleaning and drying the semi-finished product, and tearing off the third protective film to obtain the lens. According to the processing method, the second protective film and the third protective film are covered on the front surface of the formed plate firstly, and the formed plate is processed into a plurality of lenses, so that the process of sequentially pasting the lenses one by one is omitted, the protective film after CNC cutting is matched with the front surface of the lenses, the protective film can completely cover the front surface of the lenses, and the yield of the lenses is greatly improved.

Description

A lens and its processing method

technical field

The invention relates to the technical field of lens coating, in particular to a lens and a processing method thereof.

Background technique

Flat lenses are lenses obtained by printing and CNC cutting of PMMA or PC. The main materials are PMMA and PC. If the hardness of the lens surface is not high, the green plate (unreinforced plate) can even be used directly as the material of the flat lens to reduce the cost.

After the traditional flat lens is CNC-cut from the raw material, it is necessary to apply protective films one by one on the front of the lens to meet the factory requirements; however, it is difficult to focus during the film replacement process. Even if the surface area of the protective film used is larger than the front of the lens, the protective film is still prone to appear. If the front side of the lens is not fully covered, the yield rate is reduced, the efficiency is reduced, the amount of protective film is also increased, and the processing cost is increased.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a method for processing a lens, which covers the front surface of the forming sheet with a second protective film and a third protective film before CNC cutting, It is processed into multiple lenses together with the forming sheet, which saves the process of filming the lenses one by one in the later stage, and the protective film after CNC cutting is consistent with the front of the lens, so that the protective film fully covers the front of the lens, which greatly improves the yield of the lens, and It is more efficient than traditional post-filming. The processing method has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production.

Another object of the present invention is to provide a lens. Since the front side of the forming sheet is covered with a second protective film and a third protective film before CNC cutting, the time and number of times the front side of the lens is exposed to the air is reduced. Better dustproof effect, reducing the existence of air bubbles between the lens and the second protective film.

The object of the present invention is achieved through the following technical solutions: a processing method of a lens, comprising the following steps:

(S1), take the forming plate, spare;

(S2), attach the first protective film to both the positive and negative sides of the forming plate;

(S3), tear off the first protective film on the front of the forming plate, and then attach the second protective film and the third protective film on the front of the forming plate in turn;

(S4), carry out CNC cutting to the forming plate of step (S3), form a plurality of evenly distributed semi-finished products;

(S5), after cleaning and drying the semi-finished product, tear off the third protective film to obtain the lens.

In the processing method of the lens of the present invention, the front side of the forming sheet is covered with the second protective film and the third protective film before CNC cutting, and then processed together with the forming sheet to form a plurality of evenly distributed lenses, eliminating the need for filming the lenses one by one in the later stage. The protective film after CNC cutting is consistent with the front of the lens, so that the protective film fully covers the front of the lens, which greatly improves the yield of the lens and is more efficient than the traditional post-filming. Wherein, in step (S2), the front and back sides of the forming plate are attached with a first protective film, so as to avoid the forming plate being scratched due to friction during the conveying process; in step (S3), the front surface of the forming plate is The first protective film is replaced with the second protective film and the third protective film, so that the forming sheet, the second protective film and the third protective film are simultaneously processed into a single lens during the step (S4) CNC cutting process, and in the third Under the blocking action of the protective film, the second protective film on the surface of the semi-finished product is prevented from being scratched. Since the protective film used in the traditional post-coating method is first processed into a finished protective film corresponding to a single lens, and the surface area of the finished protective film used is larger than the front surface area of the lens, its cost is high. Compared with the traditional post-coating film, even if the present invention adopts The second protective film and the third protective film are used, but the total cost of the unprocessed second protective film and the third protective film is also lower than the cost of the traditional finished protective film, and the present invention can fit the second protective film at one time. Membranes are more efficient. In step (S5), cleaning is performed to remove the dust remaining in the CNC cutting process. Since the third protective film is easily scratched during the processing, the third protective film is torn off at this time so as to present the second protective film intact. . Acrylic glue is adhered to the side of the first protective film close to the lens, the side of the second protective film close to the lens, and the side of the third protective film close to the second protective film to facilitate bonding.

Since the front side of the forming sheet is covered with the second protective film and the third protective film before CNC cutting, the time and number of times the front side of the lens is exposed to air is reduced, so it has a better dustproof effect and reduces the number of lenses and the first There are air bubbles between the two protective films.

Preferably, the forming plate is formed by ink printing on the raw material plate according to the layout design, and then drying;

Wherein, the raw material sheet is PMMA sheet or PC sheet;

With the above technical solutions, PMMA sheet or PC sheet is suitable for phablet phone lenses/camera lenses. Compared with PMMA, PC has better impact toughness, but there is still a gap between it and PMMA in other indicators, especially the surface hardness. After surface hardening treatment, the hardness is only about HB level, and the lens is more likely to be scratched during use. Compared with PC, PMMA has high light transmittance, up to 92%, good weather resistance, not easy to be oxidized and cracked, and the surface hardness can reach H level or above without hardening. After hardening, the hardness can reach 4H level or above. Ink printing is performed on the raw material sheet according to the layout design, so as to divide a plurality of lens patterns on the raw material sheet.

Preferably, the first protective film is a PE protective film, an AR protective film, a PP protective film, an OPP protective film, a PVC protective film or a PET protective film.

By adopting the above technical scheme, the forming plate is prevented from being scratched due to friction during the conveying process.

Preferably, in the step (S4), before the CNC cutting the raw material plate in the step (S3), the method further includes: drilling positioning holes on both sides of the raw material plate in the step (S3).

By adopting the above technical solution, it is convenient to position the raw material plate during the CNC cutting process, and realize high-precision cutting.

Preferably, the second protective film is a PET protective film; the third protective film is a PE protective film.

Using the above technical solution, the hardness of the PET protective film is higher than that of the PE protective film, and the surface roughness of the lens is lower, while the surface roughness of the PET protective film and the surface roughness of the PE protective film are lower than those of the lens, and the PET protective film has a lower surface roughness than that of the lens. The adhesion effect between the film and the lens is much better than the adhesion effect between the PET protective film and the PE protective film, which ensures the adhesion stability between the front of the lens and the second protective film, and avoids tearing off the third protective film. During the filming process, tear off the second protective film together.

Preferably, the peeling force between the raw material sheet and the second protective film is greater than the peeling force between the second protective film and the third protective film.

By adopting the above technical solution, the adhesion stability of the front surface of the lens and the second protective film is ensured, and the tearing off together with the second protective film is avoided in the process of tearing off the third protective film.

Preferably, the step (S6) further includes: after tearing off the third protective film, and then attaching the handle portion to the surface of the second protective film.

With the above technical solution, the user can tear off the handle directly together with the second protective film, which is convenient for the user to tear off the second protective film.

Preferably, the peeling force between the handle portion and the second protective film is greater than the peeling force between the raw material sheet and the second protective film.

With the above technical solution, it is more beneficial for the user to tear off the second protective film by means of the handle. Specifically, the handle portion includes a primer layer and a PET film bonded to the primer layer, the PET film protrudes out of the second protective film, and the primer layer is sandwiched between the PET film and the second protective film. Between two protective films; the primer layer is a silica gel adhesive layer, and silica gel has better thermal stability and higher bonding strength than other adhesives.

Another object of the present invention is achieved through the following technical solutions: a lens, prepared by the above-mentioned lens processing method.

Specifically, the lens includes a lens body, a first protective film attached to the back of the lens body, and a second protective film attached to the front of the lens body, the second protective film attached to the handle. Further, the handle part includes a primer layer and a PET film bonded to the primer layer, the PET film protrudes out of the second protective film, and the primer layer is sandwiched between the PET film and the second protective film. between the two protective films. Acrylic glue is adhered to the side of the first protective film close to the lens body and the side of the second protective film close to the lens body to facilitate bonding.

The beneficial effects of the present invention are: the processing method of the lens of the present invention, the processing method covers the front surface of the forming plate with the second protective film and the third protective film before CNC cutting, and processes the forming plate together into a plurality of lenses, The process of filming the lenses one by one in the later stage is omitted, and the protective film after CNC cutting is consistent with the front of the lens, so that the protective film can fully cover the front of the lens, which greatly improves the lens yield and is more efficient than traditional post-filming. The processing method has the advantages of simple operation, convenient control, high production efficiency and low production cost, and can be used for large-scale production.

The lens of the present invention has a better dustproof effect because the second protective film and the third protective film are covered on the front of the forming plate before CNC cutting, which reduces the time and number of times the front of the lens is exposed to the air. The existence of air bubbles between the lens and the second protective film is reduced.

Description of drawings

Fig. 1 is the structure schematic diagram of the lens without handle part of the present invention;

Fig. 2 is the sectional view of A-A in Fig. 1;

Fig. 3 is the structure schematic diagram of the lens with handle part of the present invention;

Fig. 4 is the sectional view of B-B in Fig. 3;

5 is a schematic structural diagram of the forming plate according to the present invention after positioning holes are punched;

Fig. 6 is the product schematic diagram of embodiment 4 of the present invention;

FIG. 7 is a schematic diagram of the product of Comparative Example 1. FIG.

The reference numerals are: 1, forming plate; 2, first protective film; 3, second protective film; 4, positioning hole; 5, lens body; 6, handle part; 61, primer layer; 62, PET film.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the embodiments and the accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

Example 1

As shown in Figures 1-2, a lens includes a lens body 5, a first protective film 2 attached to the back of the lens body 5, and a second protective film 3 attached to the front of the lens body 5. The first protective film 3 Acrylic glue is adhered to the side of the protective film 2 close to the lens body 5 and the side of the second protective film 3 close to the lens body 5 .

Example 2

The difference between this embodiment and Embodiment 1 is:

As shown in FIGS. 3-4 , the second protective film 3 is attached with a handle portion 6 .

The handle portion 6 includes a primer layer 61 and a PET film 62 adhered to the primer layer 61 . The PET film 62 protrudes from the second protective film 3 , and the primer layer 61 is sandwiched between the second protective film 3 . between the PET film 62 and the second protective film 3 .

Example 3

As shown in Figures 1, 2, and 5, a method for processing a lens includes the following steps:

(S1), take forming plate 1, standby;

(S2), attach the first protective film 2 to the front and back sides of the forming plate 1;

(S3), tear off the first protective film 2 on the front of the forming plate 1, and then attach the second protective film 3 and the third protective film on the front of the forming plate 1 in turn;

(S4), punch positioning holes 4 on both sides of the raw material sheet in step (S3), and then perform CNC cutting on the forming sheet 1 in step (S3) to form a plurality of evenly distributed semi-finished products;

(S5), after cleaning and drying the semi-finished product, tear off the third protective film to obtain the lens.

The forming plate 1 is formed by ink printing on the raw material plate according to the layout design, and then drying;

Wherein, the raw material sheet is a PMMA sheet.

The first protective film 2 is a PE protective film.

The second protective film 3 is a PET protective film; the third protective film is a PE protective film.

The peeling force between the raw material sheet and the second protective film 3 is greater than the peeling force between the second protective film 3 and the third protective film.

Example 4

The difference between this embodiment and Embodiment 3 is:

As shown in FIGS. 3-4 , the step ( S6 ) further includes: after the third protective film is torn off, the handle portion 6 is attached to the surface of the second protective film 3 .

The peeling force between the handle portion 6 and the second protective film 3 is greater than the peeling force between the raw material sheet and the second protective film 3 .

The handle portion 6 includes a primer layer 61 and a PET film 62 adhered to the primer layer 61 . The PET film 62 protrudes from the second protective film 3 , and the primer layer 61 is sandwiched between the second protective film 3 . between the PET film 62 and the second protective film 3 .

Example 5

The difference between this embodiment and Embodiment 4 is:

The raw material sheet is a PC sheet;

The first protective film 2 is a PP protective film.

Comparative Example 1

The difference between this embodiment and Embodiment 3 is:

The lens is prepared by the following lens processing method, which specifically includes the following steps:

(S1), take forming plate 1, standby;

(S2), attach the first protective film 2 to the front and back sides of the forming plate 1;

(S3), punch positioning holes 4 on both sides of the forming plate 1 in step (S2), and perform CNC cutting on the forming plate 1 in step (S2) to form a plurality of independent semi-finished products;

(S4), after cleaning and drying, tear off the first protective film 2 on the front of the semi-finished product one by one, and then attach the second protective film 3 on the front of the semi-finished product one by one to obtain a lens.

The forming plate 1 is formed by ink printing on the raw material plate according to the layout design, and then drying;

Wherein, the raw material sheet is a PMMA sheet.

The first protective film 2 is a PE protective film.

The second protective film 3 is a PET protective film.

Example 6

Production conditions: In the production workshop, PM2.5 meets the secondary standard requirements of "Ambient Air Quality Standard" (GB3095-2012).

Under the premise of the above production conditions, the lens was produced according to the embodiment of Example 4, and the result is shown in Figure 6; under the premise of the above production conditions, the lens was produced according to the embodiment of Comparative Example 1, and the result was shown in Figure 7; the observation lens bubbles on the surface.

6 and 7, it can be seen that the surface of the lens obtained by the processing method of the lens of the present invention is smooth without bubbles, while the surface of the lens obtained by the comparative example 1 has obvious bubbles; it shows that the processing method of the lens of the present invention has better dust-proof properties. This effect reduces the existence of air bubbles between the lens and the second protective film.

The above-mentioned embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims (2)

1. A lens processing method is characterized by comprising the following steps:

(S1), taking the formed plate for standby;

(S2) attaching first protective films to the front and back surfaces of the formed plate;

(S3) tearing off the first protective film on the front surface of the formed plate, and then sequentially attaching a second protective film and a third protective film on the front surface of the formed plate;

(S4) carrying out CNC cutting on the formed plate obtained in the step (S3) to form a plurality of uniformly distributed semi-finished products;

(S5), after cleaning and drying the semi-finished product, tearing off the third protective film to obtain the lens;

the forming plate is formed by printing ink on a raw material plate according to layout design and then drying;

the raw material plate is a PMMA plate or a PC plate;

the first protective film is a PE protective film, an AR protective film, a PP protective film, an OPP protective film, a PVC protective film or a PET protective film;

in the step (S4), before performing CNC cutting on the raw material plate obtained in the step (S3), the method further includes:

punching positioning holes on two sides of the raw material plate in the step (S3);

the second protective film is a PET protective film; the third protective film is a PE protective film;

the peeling force between the raw material plate and the second protective film is larger than that between the second protective film and the third protective film;

the step (S6) further includes: after the third protective film is torn off, a handle part is attached to the surface of the second protective film;

the peeling force between the handle part and the second protective film is larger than that between the raw material plate and the second protective film;

the handle portion comprises a bottom glue layer and a PET film adhered to the bottom glue layer, the PET film protrudes out of the second protective film, and the bottom glue layer is clamped between the PET film and the second protective film.

2. An ophthalmic lens, characterized by: the lens of claim 1.

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