A light shielding film structure

Abstract

The utility model relates to keyboard module technical field especially relates to a light shielding film structure, including the PET film as the printing carrier, PET film surface is provided with the window area and non -window area, the window area is formed with white oil layer one on the printing processing, the window area is provided with the dot on the position of white oil layer one outside area position, the non -window area is formed with black oil layer on the printing processing, PET film back surface and white oil layer one and black oil layer corresponding position department are formed with white oil layer two on the printing processing, this light shielding film structure can avoid the problem that light transmits in the invalid overflow of PET film non -window area transmission process and the light absorption influence of surrounding dim environment and the brightness decline, the light is guided to the window area utmost, improves the brightness of window area, and then increases the luminous intensity of keyboard, ensures that the key backlight is clearer and brighter.

Description

Technical Field

[0001] This utility model relates to the field of keyboard module technology, specifically to a light-shielding film structure. Background Technology

[0002] As laptops become more portable and high-performance, user demands for keyboard experience continue to rise. Especially in complex environments with low light or dim lighting (such as nighttime work or outdoor low-light scenarios), backlit keyboards have become mainstream. The core requirement is to ensure clear and bright light in the areas corresponding to the keys, while avoiding unnecessary light loss in unnecessarily, thus balancing ease of operation and visual comfort. Against this backdrop, the light-shielding film, as a key optical control component of backlit keyboards, directly determines the light utilization rate and light emission effect of the backlight system through its structural design, making it one of the core factors affecting keyboard backlight performance.

[0003] To achieve directional light guidance, current laptop keyboards generally use a light-shielding film to constrain the light propagation path. Theoretically, this structure should concentrate the light generated by the backlight module towards the viewing area, reducing light leakage from non-viewing areas. However, in practical applications, existing light-shielding film structures have significant technical flaws, making it difficult to meet users' high-quality requirements for brightness and uniformity. Firstly, the lack of an effective light-blocking structure in the non-viewing area causes some of the light emitted by the backlight module to leak out ineffectively from the non-viewing area, resulting in wasted light. Furthermore, the back of the light-blocking film is usually in direct or indirect contact with dark components such as iron plates and metal brackets inside the keyboard. The surfaces of these metal components tend to absorb light, further weakening the light intensity transmitted to the viewing area. Ultimately, this results in insufficient overall keyboard brightness and dim lighting in the viewing area, making it difficult to meet the user's need for clear identification in low-light environments.

[0004] Secondly, in the viewing area of ​​the light-shielding film (i.e. the light-transmitting area corresponding to the key characters or key outlines), existing designs mostly rely on a single dot structure to diffuse light. However, the dot processing is prone to inconsistencies in shape due to differences in process precision, which in turn causes uneven brightness distribution in the viewing area from different viewing angles. This seriously affects the user's visual experience at different usage angles and fails to meet the high-quality requirements for backlight uniformity. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a light-blocking film structure that solves the technical problems of traditional light-blocking films failing to form an effective light-blocking structure and uneven brightness distribution in the viewing window area.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a light-shielding film structure, comprising a PET film as a printing carrier, wherein the surface of the PET film is provided with a viewing area and a non-viewing area, a white oil layer I is formed on the viewing area by printing, halftone dots are provided on the viewing area at the position outside the white oil layer I, a black oil layer is formed on the non-viewing area by printing, and a white oil layer II is formed on the back of the PET film at the position corresponding to the white oil layer I and the black oil layer.

[0007] Preferably, the thickness of the PET film is 0.025 mm.

[0008] Preferably, the viewing area is provided in several groups, and each viewing area is set to correspond one-to-one with the position of the keyboard backlight and the position of the hole in the keyboard keycap plate.

[0009] Preferably, both the first white oil layer and the second white oil layer are printed planar surfaces, and the thickness of the first white oil layer and the second white oil layer is 0.01 mm.

[0010] By employing the above technical solution, this utility model provides a light-shielding film structure, which has at least the following beneficial effects: 1. This utility model avoids the problem of ineffective light leakage during light transmission in the non-viewing window area and the back area of ​​the PET film by printing a black oil layer and a white oil layer on the non-viewing window area and the back area of ​​the PET film respectively. This avoids the problem of brightness reduction caused by light absorption by the surrounding dark environment (iron plate / metal plate surface). The light is guided to the viewing window area to the extreme, which improves the brightness of the viewing window area and thus increases the backlight brightness of the keyboard, ensuring that the key backlight is clearer and brighter.

[0011] 2. This utility model sets a white oil layer and halftone dots on the viewing area of ​​the PET film. The white oil layer further improves the brightness of the viewing area, fundamentally eliminating the problem of uneven brightness caused by differences in halftone dot shape. This allows the keyboard to present a uniform brightness distribution from different viewing angles, improving the user's visual experience.

[0012] 3. In this utility model, the number and position of the light-blocking white oil window group are set to correspond to the position of the keyboard backlight and the keycap iron plate hole, which can accurately guide the backlight to switch to the surface light source and reduce the diffuse scattering loss of light. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application: Figure 1 This is a schematic diagram of the surface structure of the light-shielding film of this utility model; Figure 2 This is a schematic diagram of the structure of the back of the light-shielding film of this utility model; Figure 3This utility model Figure 1 Enlarged structural diagram at point A; Figure 4 This is a partial structural diagram of the viewing window area of ​​the light-shielding film of this utility model; Figure 5 This is a front view of the light-blocking film product of this utility model; Figure 6 This is a photograph of the reverse side of the light-blocking film product of this utility model; Figure 7 This is a visual representation of the light-blocking film product of this utility model after it has been illuminated. Figure 8 This is a schematic diagram of the printing equipment of this utility model.

[0014] Figure label: 1. PET film; 2. Viewing window area; 21. White oil layer one; 22. Dots; 3. Non-viewing window area; 31. Black oil layer; 32. White oil layer two; 4. Machine body; 5. Feeding shaft; 6. Correction device one; 7. Printing device; 8. Control panel; 9. Oven; 10. Laminating device; 11. Correction device two; 12. Receiving shaft. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Example 1 In existing technologies, traditional light guide films do not form an effective light-blocking structure in non-viewing areas, causing some light emitted by the backlight module to leak ineffectively from these areas, resulting in light waste. Furthermore, the back of the light-blocking film is usually in direct or indirect contact with dark components such as metal plates and supports inside the keyboard. The surfaces of these metal components easily absorb light, further weakening the light intensity transmitted to the viewing area, ultimately leading to insufficient overall keyboard brightness. To address the shortcomings of existing technologies, please refer to [reference needed]. Figures 1-8This embodiment provides a light-shielding film structure, including a PET film 1 as a printing carrier. The thickness of the PET film 1 is 0.025 mm. A viewing area 2 and a non-viewing area 3 are provided on the surface of the PET film 1. A white ink layer 21 is formed on the viewing area 2 through printing. Halftone dots 22 are provided on the viewing area 2 at positions outside the white ink layer 21. A black ink layer 31 is formed on the non-viewing area 3 through printing. A second white ink layer 32 is formed on the back of the PET film 1 at positions corresponding to the white ink layer 21 and the black ink layer 31 through printing. The white ink layer 21 and the white ink layer 32... Layer 32 is a printed flat surface, and the thickness of white oil layer 21 and white oil layer 32 is 0.01mm. By printing black oil layer 31 and white oil layer 32 on the non-viewing area 3 on the surface of PET film 1 and the back area of ​​PET film 1 respectively, the problem of ineffective light leakage in the non-viewing area 3 of PET film 1 and the problem of brightness reduction due to light absorption by the surrounding dark environment (iron plate / metal plate surface) can be avoided. The light is guided to the viewing area 2 to the extreme, which improves the brightness of the viewing area 2, thereby increasing the backlight brightness of the keyboard and ensuring that the key backlight is clearer and brighter.

[0017] The viewing area 2 is set in several groups, and each viewing area 2 is set to correspond one-to-one with the position of the keyboard backlight and the position of the hole in the keyboard keycap plate; this allows the light from each backlight to be efficiently guided to the viewing area 2, greatly reducing the light scattering loss.

[0018] The light-shielding film structure of this embodiment has significant advantages. It uses a PET film 1 with a thickness of only 0.025mm as the printing carrier, and is paired with white oil layer 1 31 and white oil layer 2 32 with a thickness of 0.01mm. It is both thin and light enough to fit the compact internal space of the laptop keyboard, and the black oil layer 31 on the non-viewing area 3 of the PET film 1 surface blocks the ineffective leakage of light, and the white oil layer 2 32 on the back avoids the decrease in brightness caused by the light absorption of the surrounding dark iron plate / metal plate. At the same time, the design of white oil layer 21 and halftone dots 22 in the viewing area 2, combined with the one-to-one correspondence between each viewing area 2 and the keyboard backlight and the keycap iron plate hole, can efficiently guide the light of each backlight, greatly reduce the light scattering loss, and ultimately maximize the brightness of the viewing area 2 and the overall keyboard, ensuring that the key backlight is clearer and brighter.

[0019] Example 2 Based on Example 1, this example proposes a white oil printing process for preparing a light-shielding film structure, including the following steps: S1: Design the light-shielding white varnish file using CAD software, where the white varnish is a printable flat surface with a thickness of 0.01mm; S2: The screen is screen-processed. The screen-processed screen can accurately carry the white ink and transfer it to the PET film 1 according to the design pattern, ensuring the positioning accuracy and uniformity of the white ink printing, and avoiding problems such as printing offset and uneven white ink distribution caused by the unprocessed screen. S3: The processed screen is installed in the printing equipment. Through the printing process, white ink is printed onto the viewing area of ​​PET film 1 and the back of PET film 1, forming white ink layer 1 21 and white ink layer 2 32 on PET film 1. Then, black ink is printed onto the non-viewing area 3 on the surface of PET film 1, forming black ink layer 31 on PET film 1, thus obtaining a light-blocking film structure. Automated printing is achieved with the help of printing equipment, which can improve production efficiency and meet the needs of mass production.

[0020] In step S3, the printing temperature of the printing process is 90℃. This temperature provides the best conditions for the bonding of white oil and PET film 1. It will not cause the PET film 1 to deform or melt due to excessive temperature, nor will it cause the white oil to have poor fluidity and weak adhesion due to excessive temperature. This effectively ensures the stability of printing quality and reduces the differences in finished product performance caused by temperature fluctuations.

[0021] Example 3 Based on Examples 1 and 2, please refer to Figure 6 This embodiment proposes a printing device for implementing white oil printing process, including a machine body 4 as the main body of the device. One end of the machine body 4 is equipped with a feeding shaft 5 for placing roll PET film 1. A correction device 6 installed on the machine body 4 is arranged on the discharge path of the feeding shaft 5. A printing device 7 and an operation panel 8 are arranged sequentially at intervals on one side of the correction device 6. A screen for printing light-blocking white oil window assembly 3 on the transparent layer 2 of PET film 1 is installed on the printing device 7.

[0022] It also includes an oven 9 located on one side of the machine body 4. The oven 9 is equipped with a laminating device 10 for laminating the printed PET film 1 and a correction device 2 11 for correcting the conveying position of the PET film 1. Above the correction device 2 11 is a take-up shaft 12 for winding and forming a light-shielding film structure.

[0023] The printing equipment provided in this embodiment is compatible with the light-shielding film structure proposed in Embodiment 1 and the white oil printing process proposed in Embodiment 2. The designed light-shielding film structure can be applied to the white oil printing process, so that white oil layer 21 and white oil layer 32 are formed on the light-shielding film, thereby improving optical brightness and increasing product yield, while saving finished product losses and reducing defect rate.

[0024] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A light-shielding film structure, comprising a PET film (1) as a printing carrier, characterized in that, The PET film (1) has a viewing area (2) and a non-viewing area (3) on its surface. A white oil layer (21) is formed on the viewing area (2) by printing. Halftone dots (22) are set on the viewing area (2) at the position outside the white oil layer (21). A black oil layer (31) is formed on the non-viewing area (3) by printing. A white oil layer (32) is formed on the back of the PET film (1) at the position corresponding to the white oil layer (21) and the black oil layer (31).

2. The light-shielding film structure according to claim 1, characterized in that, The thickness of the PET film (1) is 0.025 mm.

3. The light-shielding film structure according to claim 1, characterized in that, The viewing area (2) is provided in several groups, and each viewing area (2) is set to correspond one-to-one with the position of the keyboard backlight and the position of the hole in the keyboard keycap plate.

4. The light-shielding film structure according to claim 1, characterized in that, Both white oil layer one (21) and white oil layer two (32) are printed planar bodies, and the thickness of white oil layer one (21) and white oil layer two (32) is 0.01mm.

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