Simple embossing device for convex grating

Abstract

The utility model discloses a simple embossing device for a convex grating. The simple embossing device comprises a transfer printing mold, a grating mother set, a fixing clamp and a demolding device, the transfer printing mold is provided with a concave surface matched with the convex surface of the grating mother set, and the convex surface and the concave surface are attached and connected through ultraviolet curing; the transfer printing mold is detachably installed on the fixing clamp, a demolding auxiliary plate is installed on the top end face of the grating mother set, and the demolding device is located outside the demolding auxiliary plate and connected with the demolding auxiliary plate in a clamped mode. According to the scheme, the demolding device is matched with the demolding auxiliary plate, separation of the grating mother set and the transfer mold is achieved, damage to the grating mother set is avoided, and a grating mother set pattern is smoothly transferred to the transfer mold. The pattern on the transfer printing mold can be perfectly transferred to a convex surface substrate (product substrate) to be imprinted through repeated operation, and the pattern and the convex surface substrate are separated through the demolding device again. And high repeatability and high quality of the convex grating master mask and the secondary master mask can be well guaranteed by utilizing hard-to-hard conversion.

Description

Technical Field

[0001] This utility model relates to the field of embossing devices, and more specifically, to a simple embossing device for convex gratings. Background Technology

[0002] Grating master printing, as a core process in grating manufacturing, can not only improve the efficiency and scale of grating manufacturing, but also significantly reduce manufacturing costs, and has the core advantages of high efficiency, low cost and high precision.

[0003] Currently, the two most commonly used methods for planar substrates are thermal nanoimprinting (HE-NIL) and ultraviolet-cured nanoimprinting (UV-NIL), which have different curing methods. HE-NIL has the advantages of being suitable for fabricating structures with high aspect ratios and requiring relatively simple equipment; however, it requires high temperatures and pressures, which may cause template deformation or damage, and its production efficiency is relatively low. UV-NIL, on the other hand, does not require high temperatures and pressures, making it suitable for temperature-sensitive materials; it also offers faster production speeds, making it suitable for large-scale production.

[0004] Curved substrates, due to their unique grating surfaces to be replicated, require higher precision and accuracy in imprinting methods and equipment. Currently, the most commonly used method for imprinting curved gratings is soft mold imprinting. The main steps are as follows: First, a liquid UV-curable resist is spin-coated onto the curved substrate at room temperature; then, a soft mold with grooves is pressed into the resist on the substrate, and the waveform or curvature of the substrate is adjusted until complete conformal contact is achieved with the soft mold; after the soft mold completely fills the cavities or grooves, it is cured by ultraviolet light; finally, the soft mold is detached from the curved substrate, leaving the cured grating grooves on the curved substrate.

[0005] While this technology can avoid stress cracking and resolution loss caused by bending and bonding of gratings, the shear stress generated during the separation of the soft mold from the substrate can cause structural deformation, especially at the edges of curved surfaces, thus forming grating periodic distortion. At the same time, for high aspect ratio gratings, it is easy to leave colloid residue, which affects subsequent transfer printing and secondary master copying. Utility Model Content

[0006] The purpose of this invention is to provide a simple embossing device for convex gratings to solve the technical problems existing in the background art.

[0007] This utility model provides a simple embossing device for convex gratings, including a transfer mold, a grating master plate, a fixing fixture, and a demolding device;

[0008] The transfer mold is provided with a concave surface that matches the convex surface of the grating master plate, and the convex surface and the concave surface are in contact and connected by ultraviolet curing; the transfer mold is detachably installed on the fixing fixture, a demolding auxiliary plate is installed on the top end face of the grating master plate, and the demolding device is located outside the demolding auxiliary plate and is engaged with the demolding auxiliary plate.

[0009] In a preferred embodiment, the demolding auxiliary plate includes a glass plate with a diameter larger than that of the grating master plate, and the glass plate is detachably connected to the grating master plate.

[0010] In a preferred embodiment, the fixing clamp has an opening on one side, and two fastening blocks are provided at the opening, the two fastening blocks being fixed by bolts.

[0011] In a preferred embodiment, a plurality of recessed slots are symmetrically distributed within the clamping area of ​​the fixing clamp.

[0012] In a preferred embodiment, the demolding device includes a demolding puller, a demolding cover plate, a ball head screw, and a locating pin;

[0013] The demolding base is provided with an annular groove that is engaged below the demolding auxiliary plate. The demolding cover plate covers the demolding auxiliary plate and is fixed to the demolding pull base by bolts. The positioning pin passes through the demolding pull base and the fixing fixture. The ball head screw passes through the demolding pull base and contacts the upper end face of the fixing fixture.

[0014] In a preferred embodiment, the locating pins are arranged in two groups on the same side; the ball head screws are arranged in three groups, one group being arranged on the same side as the locating pins and located between the two groups of locating pins, and the other two groups being distributed on the other side of the demolding cover plate.

[0015] The beneficial effects of this utility model's technical solution are:

[0016] The demolding device in this solution works in conjunction with a demolding auxiliary plate to separate the lenticular master plate from the transfer mold, avoiding damage to the lenticular master plate and allowing the lenticular master plate pattern to be smoothly transferred to the transfer film. Repeated operation can perfectly transfer the pattern from the transfer film to the convex substrate (product substrate) to be imprinted, and then the two are separated again by the demolding device. Utilizing hard-to-hard transfer effectively achieves high repeatability and high-quality assurance for convex lenticular master plates and secondary master plates. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is an exploded view of the structure of this utility model.

[0019] Figure 3 This is a cross-sectional view of the present invention.

[0020] Figure 4 This is another schematic diagram of the overall structure of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Transfer mold, 2. Lattice master plate, 3. Demolding auxiliary plate, 4. Fixing clamp, 5. Fastening block, 6. Demolding device, 7. Demolding pull base, 8. Demolding cover plate, 9. Ball head screw, 10. Positioning pin, 11. Annular groove, 12. Recessed groove. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0023] like Figures 1-3 As shown, the present invention provides a simple embossing device for convex gratings, including a transfer mold 1, a grating master plate 2, a fixing fixture 4, and a demolding device 6; the transfer mold 1 is provided with a concave surface that matches the convex surface of the grating master plate 2, and the convex surface and the concave surface are in contact and connected by ultraviolet curing; the transfer mold 1 is detachably mounted on the fixing fixture 4, a demolding auxiliary plate 3 is mounted on the top end face of the grating master plate 2, and the demolding device 6 is located outside the demolding auxiliary plate 3 and is engaged with the demolding auxiliary plate 3.

[0024] In the above scheme, the concave surface of the transfer mold 1 is fitted with the convex surface of the lenticular master plate 2, and the two have the same curvature. A release agent is uniformly coated on the lenticular master plate, and the two are bonded together by ultraviolet curing to form the basic structure for pattern transfer. The fixing fixture 4 fixes the bonded transfer mold 1. The demolding device 6 cooperates with the demolding auxiliary plate 3 to separate the lenticular master plate 2 from the transfer mold 1, so that the lenticular master plate pattern is transferred to the transfer film. Repeated operation can perfectly transfer the pattern on the transfer film to the convex substrate (product substrate) to be imprinted, and the two are separated again by the demolding device 6. The hard-to-hard transfer method can effectively achieve high repeatability and high quality assurance for the convex lenticular master plate 2 and the secondary master plate.

[0025] The fixing clamp 4 has an opening on one side, and two fastening blocks 5 are provided at the opening. The two fastening blocks 5 are fixed by bolts. Several recessed slots 12 are symmetrically distributed within the clamping area of ​​the fixing clamp 4. During installation, the transfer mold 1 is placed into the clamping area of ​​the fixing clamp 4, and the bolts are tightened to clamp the mold with the two fastening blocks 5; the recessed slots 12 undergo elastic deformation during clamping, tightly wrapping the curved surface of the mold.

[0026] The demolding auxiliary plate 3 includes a glass plate with a diameter larger than that of the grating master plate 2, and the glass plate is detachably connected to the grating master plate 2. During installation, hot melt adhesive is applied to the bottom surface of the glass plate and it is attached to the top surface of the quasi-grating master plate 2. After the adhesive cures, a "master plate-glass plate" connection is formed. During demolding, the demolding device 6 pulls the glass plate, indirectly causing the master plate to detach from the transfer mold 1. The hot melt adhesive connection facilitates subsequent heating and separation, and the glass plate, as an intermediate medium, prevents the demolding device 6 from directly acting on the edge of the master plate, preventing edge wear due to tension, protecting the precision of the grating master plate 2, and supporting recycling.

[0027] The demolding device 6 includes a demolding pull base 7, a demolding cover plate 8, ball head screws 9, and a positioning pin 10. The demolding pull base 7 is provided with an annular groove 11 that engages below the demolding auxiliary plate 3. The demolding cover plate 8 covers the demolding auxiliary plate 3 and is fixed to the demolding pull base 7 by bolts. The positioning pin 10 passes through the demolding pull base 7 and the fixing clamp 4.

[0028] After the connector between the transfer mold 1 and the lenticular master plate 2 is installed on the fixing fixture 4, the demolding puller 7 is installed above the fixing fixture 4 and positioned by the locating pin 10. Simultaneously, the ball head screw 9 passes through the demolding puller 7 and contacts the upper end face of the fixing fixture 4. After these steps are completed, the glass plate is glued and fixed to the top end face of the lenticular master plate 2. Then, the demolding cover plate 8 is fixed above the glass plate. The cover plate prevents the connector between the glass plate and the lenticular master plate 2 from flying out during demolding, ensuring demolding safety.

[0029] The positioning pins 10 are configured in two sets, located on the same side; the ball head screws 9 are configured in three sets, one set being located on the same side as the positioning pins 10 and between the two sets of positioning pins 10, and the other two sets being distributed on the other side of the demolding cover plate 8. During demolding, the ball head screws 9 located on the side of the positioning pins 10 are first turned to apply an upward pulling force to the connector between the glass plate and the grating master plate 2, while simultaneously pulling the positioning pins 10 outward to slowly loosen the connector. Then, the two sets of ball head screws 9 on the other side are turned alternately, and the grating master plate 2 and the glass assembly are gradually pulled out by alternating force from both sides. The positioning pins 10 and the annular groove 11 ensure vertical movement during demolding, avoiding pattern distortion caused by horizontal offset. The ball head screws 9 control the demolding speed and angle by adjusting the tightening force.

[0030] This device enables precise connection and separation between the convex grating master plate 2 and the transfer mold 1, effectively solving problems such as stress deformation and residual adhesive in traditional soft mold printing, and improving the quality and efficiency of grating manufacturing.

[0031] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A simple embossing apparatus for a convex grating, characterized by: Includes transfer mold, lenticular master, fixing fixture and demolding device; The transfer mold is provided with a concave surface that matches the convex surface of the grating master plate, and the convex surface and the concave surface are in contact and connected by ultraviolet curing; the transfer mold is detachably installed on the fixing fixture, a demolding auxiliary plate is installed on the top end face of the grating master plate, and the demolding device is located outside the demolding auxiliary plate and is engaged with the demolding auxiliary plate.

2. A simple embossing device for a convex grating according to claim 1, characterized in that: The demolding auxiliary plate includes a glass plate with a diameter larger than that of the grating master plate, and the glass plate is detachably connected to the grating master plate.

3. A simple embossing device for a convex grating according to claim 1, characterized in that: The fixing clamp has an opening on one side, and two fastening blocks are provided at the opening. The two fastening blocks are fixed by bolts.

4. A simple embossing device for a convex grating according to claim 1, characterized in that: The clamping area of ​​the fixing fixture has several recessed slots symmetrically distributed.

5. A simple embossing device for a convex grating according to claim 1, characterized in that: The demolding device includes a demolding puller, a demolding cover plate, ball head screws, and locating pins; The demolding puller is provided with an annular groove that is engaged below the demolding auxiliary plate. The demolding cover plate covers the demolding auxiliary plate and is fixed to the demolding puller by bolts. The positioning pin passes through the demolding puller and the fixing fixture. The ball head screw passes through the demolding puller and contacts the upper end face of the fixing fixture.

6. A simple embossing device for a convex grating according to claim 5, characterized in that: The locating pins are configured in two sets, and are located on the same side; the ball head screws are configured in three sets, one set being located on the same side as the locating pins and between the two sets of locating pins, and the other two sets being distributed on the other side of the demolding cover plate.

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