Aperture blade

Abstract

The present invention relates to an aperture blade which includes an anti-reflection layer on a surface thereof and is thus capable of controlling the amount of light incident onto a lens and preventing surface damage due to foreign substances. The features according to a preferred embodiment comprise: a base layer having an upper surface and a lower surface facing each other; a first light-reflection-preventing layer provided on the upper surface of the base layer; a first protective layer provided on the upper surface of the first light-reflection-preventing layer; a second light-reflection-preventing layer provided on the lower surface of the base layer; and a second protective layer provided on the lower surface of the second light-reflection-preventing layer, wherein reflectivity may be improved by coating a high-refractive-index / low-refractive-index thin film on the blade, and by using deposition or fine coating technology, frictional force may be improved and adsorption of foreign substances may be prevented, and generation of static electricity due to friction caused by frequent operations may be prevented.

Description

Aperture blade

[0001] The present invention relates to an aperture blade, and more particularly, to an aperture blade that includes an anti-reflection layer on the surface to control the amount of light incident on a lens and prevent surface damage caused by foreign substances.

[0002] Since the introduction of camera modules in portable devices like mobile phones and PDAs, continuous research and development has been conducted to improve their performance, leading to dramatic improvements in camera module performance. Mobile phones are now equipped with high-resolution, high-performance camera modules, incorporating technologies such as high-performance autofocus, mechanical shutters, irises, and neutral density filters (ND filters).

[0003] The aperture may be composed of multiple shading blades. When the multiple shading blades overlap and operate, light may pass between each shading blade and be reflected from the side of the transparent resin, and the reflected light may enter the photosensitive material or image sensor. This reflection may cause flare and ghosting phenomena.

[0004] Mechanical shutters, apertures, and ND filters still have inherent instability, such as intermittent interruptions during operation. The primary cause of mechanical shutter and aperture failure is static electricity generated by friction with other nearby components during operation.

[0005] Therefore, an aperture blade is required that can prevent flare and ghosting through complete shading and prevent friction that causes static electricity.

[0006] The present invention aims to provide an aperture blade capable of improving friction, preventing foreign substances from adhering to a surface, and improving reflectivity.

[0007] Another object of the present invention is to provide an aperture blade that can operate stably by preventing operation stoppage and malfunction due to a charging phenomenon.

[0008] In order to achieve this purpose, an aperture blade according to one embodiment of the present invention comprises a substrate layer having an upper surface and a lower surface facing each other; and a first anti-reflection layer provided on the upper surface of the substrate layer.

[0009] An aperture blade according to a preferred embodiment of the present invention further includes a first protective layer provided on an upper surface of the first anti-reflection layer.

[0010] An aperture blade according to a preferred embodiment of the present invention further comprises a second anti-reflection layer provided on the lower surface of the substrate layer; and a second protective layer provided on the lower surface of the second anti-reflection layer.

[0011] In the aperture blade according to the present invention, the first anti-reflection layer and the second anti-reflection layer include at least one low-refractive-index thin film layer and at least one high-refractive-index thin film layer that are alternately laminated.

[0012] In the aperture blade according to the present invention, the low-refractive-index thin film layer can be formed closer to the substrate layer than the high-refractive-index thin film layer.

[0013] In the aperture blade according to the present invention, the low-refractive-index thin film layer may include SiO2, and the high-refractive-index thin film layer may include TiO2.

[0014] In the aperture blade according to the present invention, the first protective layer and the second protective layer may be formed by including a fluorine-based material.

[0015] In the aperture blade according to the present invention, the substrate layer may be formed in the form of a film including at least one material selected from polyethylene terephthalate (PET), polyethylene naphthalate, polyimide, aramid, polyphenylene sulfide, and polyether sulfone.

[0016] In the aperture blade according to the present invention, the substrate layer may have a thickness of 5 μm to 200 μm.

[0017] According to another embodiment of the present invention, an aperture blade includes a substrate layer having upper and lower surfaces facing each other; and a first light-shielding layer provided on the upper surface of the substrate layer, wherein the first light-shielding layer may include black carbon and a filler having a relatively smaller particle size than the black carbon.

[0018] An aperture blade according to another embodiment of the present invention may further include a second light-shielding layer provided on a lower surface of the substrate layer.

[0019] In another embodiment of the present invention, the filler in the aperture blade may include at least one of Si, F, O, and C.

[0020] In another embodiment of the present invention, the first shading layer and the second shading layer in the aperture blade may have a surface with irregular unevenness and a short period.

[0021] An antistatic layer may be formed on the upper surface of the first light-shielding layer of the aperture blade according to another embodiment of the present invention.

[0022] The aperture blade according to the present invention can exhibit the effect of improving reflectivity by coating a high-refractive index / low-refractive index thin film on the blade, and improving friction and preventing foreign substances from adsorbing by using deposition or micro-coating technology.

[0023] In addition, the aperture according to the present invention can prevent static electricity from being generated due to friction resulting from frequent operation.

[0024] FIG. 1 is an exemplary drawing showing a cross-section of an aperture blade according to a first embodiment of the present invention.

[0025] FIG. 2 is an exemplary drawing showing a cross-section of an aperture blade according to a second embodiment of the present invention.

[0026] FIG. 3 is an exemplary drawing showing a cross-section of an aperture blade according to a third embodiment of the present invention.

[0027] FIG. 4 is an exemplary diagram showing a cross-section of an aperture blade according to a fourth embodiment of the present invention.

[0028] FIG. 5a and FIG. 5b are exemplary views showing a cross-section of an aperture blade according to a fifth embodiment of the present invention.

[0029] Figure 6 is an exemplary drawing showing a cross-section of an aperture blade according to a sixth embodiment of the present invention.

[0030] With respect to the embodiments of the present invention disclosed in the text, specific structural and functional descriptions are merely exemplified for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described in the text.

[0031] The present invention is susceptible to various modifications and takes various forms. Specific embodiments are illustrated in the drawings and described in detail herein. However, this is not intended to limit the present invention to specific disclosed forms, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0032] While terms like "first" and "second" may be used to describe various components, these components are not limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0033] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but there may also be other components in between. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between. Other expressions that describe the relationship between components, such as "between" and "directly between" or "adjacent to" and "directly adjacent to", should be interpreted similarly. Similarly, "disposed on" can mean disposed directly on the surface of another component or disposed above the surface by a distance.

[0034] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprises" or "has" indicate the presence of a disclosed feature, number, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0035] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and shall not be construed in an idealized or overly formal sense unless explicitly defined herein.

[0036] Meanwhile, if a particular embodiment can be implemented differently, the functions or operations specified within a particular block may occur in a different order than specified in the flowchart. For example, two consecutive blocks may actually be performed substantially simultaneously, or, depending on the related functions or operations, the blocks may be performed in reverse order.

[0037] Hereinafter, an aperture blade according to the present invention will be described with reference to the attached drawings.

[0038] Fig. 1 is an exemplary cross-sectional view of an aperture blade according to a first embodiment of the present invention. Referring to Fig. 1, the aperture blade according to the present invention may be formed of a relatively lightweight material in the form of a thin plate. The aperture blade has a first anti-reflection layer (210) applied to an upper portion of a substrate layer (100). The substrate layer (100) may be in the form of a film having an upper surface (100US) and a lower surface (100LS) facing each other.

[0039] The above substrate layer (100) may include at least one material selected from polyethylene terephthalate (PET), polyethylene naphthalate, polyimide, aramid, polyphenylene sulfide, and polyether sulfone.

[0040] Among these, the substrate layer (100) made of polyethylene terephthalate (PET) is widely used because of its low specific gravity, and polyethylene naphthalate exhibits heat resistance at about 200°C, so it can be used in an environment of 155°C to 200°C, and because it is inexpensive, it can be used as a useful industrial material.

[0041] Polyimide, aramid, polyphenylene sulfide, or polyether sulfone also exhibit heat resistance of over 200°C, and thus can be used in environments above 200°C. In particular, polyimide exhibits the highest heat resistance of over 300°C, making it the most desirable. However, the present invention is not limited to this, and any resin material is sufficient, and it can also be composed of a transparent resin or a colored resin mixed with pigments.

[0042] The above substrate layer (100) may have a thickness of 5 μm to 200 μm. If the thickness is less than 5 μm, the substrate may be susceptible to surface defects such as scratches or folds, and if the thickness is greater than 200 μm, it may be difficult to mount multiple light shielding blades on the iris aperture in terms of volume simplification.

[0043] The first anti-reflection layer (210) formed on the upper surface (100US) of the above-mentioned substrate layer (100) may be formed by alternately stacking low-refractive-index thin film layers and high-refractive-index thin film layers. The first anti-reflection layer (210) may have a structure in which a high-refractive-index thin film layer, titanium dioxide (TiO2), is stacked on top of a low-refractive-index thin film layer, silicon dioxide (SiO2). At this time, at least two low-refractive-index thin film layers and two high-refractive-index thin film layers may be alternately stacked.

[0044] This example diagram shows that a first high-refractive-index thin film layer (212a) is laminated on a first low-refractive-index thin film layer (211a), a second low-refractive-index thin film layer (211b) is laminated on the first high-refractive-index thin film layer (212a), and a second high-refractive-index thin film layer (212b) is laminated on the second low-refractive-index thin film layer (211b). However, this does not mean that the aperture blade according to the present invention is limited to this configuration.

[0045] That is, an aperture blade having a configuration in which one high-refractive-index thin film layer (212a) is laminated on one low-refractive-index thin film layer (211a) is also possible. In addition, a structure in which a third low-refractive-index thin film layer (not shown) is laminated on a second high-refractive-index thin film layer, and a third high-refractive-index thin film layer (not shown) is laminated on a third low-refractive-index thin film layer, may be possible. That is, the anti-reflection layer (210) may be formed of at least two layers including a low-refractive-index thin film layer and a high-refractive-index thin film layer, and may be formed in various forms.

[0046] In addition, although the example of applying a low-refractive-index thin film layer on top of the substrate layer (100) and then applying a high-refractive-index thin film layer is shown, the lamination order may be shown differently as needed. By forming the first anti-reflection layer (210) on the upper surface (100US) of the substrate layer (100) in this way, the reflectivity can be improved. That is, since the light-shielding blade accurately blocks the amount of incident light entering the lens, the occurrence of flare or ghost phenomena caused by unnecessary diffuse reflection of light can be prevented.

[0047] Fig. 2 is an exemplary cross-sectional view of an aperture blade according to a second embodiment of the present invention. The aperture blade according to the second embodiment of the present invention has a configuration in which a protective layer (300) is formed on the upper part of the second high-refractive-index thin film layer (212b) disposed at the uppermost part of the aperture blade according to the first embodiment. The protective layer (300) is formed on the surface of the second high-refractive-index thin film layer (212b) using a deposition or micro-coating technique. The protective layer (300) implements a function of preventing foreign substances from entering from the outside and improving friction. The protective layer (300) may include a fluorine-based material.

[0048] Fig. 3 is an exemplary diagram showing a cross-section of an aperture blade according to a third embodiment of the present invention. As shown, it comprises a first anti-reflection layer (210) disposed on an upper surface (100US) of a substrate layer (100), a first protective layer (310) disposed on an upper surface of the first anti-reflection layer (210), a second anti-reflection layer (220) disposed on a lower surface (100LS) of the substrate layer (100), and a second protective layer (320) disposed on a lower surface of the second anti-reflection layer (220).

[0049] The first anti-reflection layer (210) and the second anti-reflection layer (220) have a configuration that is symmetrical with respect to the substrate layer (100). That is, the first anti-reflection layer (210) is laminated in the order of a first low-refractive-index thin film layer (211a), a first high-refractive-index thin film layer (212a), a second low-refractive-index thin film layer (211b), and a second high-refractive-index thin film layer (212b) on the upper side of the substrate layer (100), and the second anti-reflection layer (220) is laminated in the order of a third low-refractive-index thin film layer (221a), a third high-refractive-index thin film layer (222a), a fourth low-refractive-index thin film layer (221b), and a fourth high-refractive-index thin film layer (222b) on the lower side of the substrate layer (100). At this time, the first low-refractive-index thin film layer, the second low-refractive-index thin film layer, the third low-refractive-index thin film layer, and the fourth low-refractive-index thin film layer may all be formed of the same material and have the same thickness. If necessary, the thicknesses of the first low-refractive-index thin film layer (211a) and the second low-refractive-index thin film layer (211b) arranged on the upper side of the substrate layer (100) may be different from each other, or the thicknesses of the third low-refractive-index thin film layer (221a) and the fourth low-refractive-index thin film layer (221b) arranged on the lower side of the substrate layer (100) may be different from each other. In addition, in some cases, the thicknesses of the first low-refractive-index thin film layer (211a) arranged on the upper side of the substrate layer (100) and the third low-refractive-index thin film layer (221a) arranged on the lower side of the substrate layer (100) may be different from each other. The correlation between the first high-refractive-index thin film layer (212a), the second high-refractive-index thin film layer (212b), the third high-refractive-index thin film layer (222a), and the fourth high-refractive-index thin film layer (222b) may also be similar.

[0050] A first protective layer (310) may be disposed on the upper portion of the first anti-reflection layer (210), and a second protective layer (320) may be disposed on the lower portion of the second anti-reflection layer (220). The first protective layer (310) and the second protective layer (320) may both be formed of the same material and have the same thickness. In some cases, the first protective layer (310) and the second protective layer (320) may be disposed with different thicknesses.

[0051] Fig. 4 is an exemplary cross-sectional view of an aperture blade according to a fourth embodiment of the present invention. As illustrated in Fig. 4, the aperture blade according to the present invention may include an upper light-shielding layer (U210A) disposed on an upper surface of a substrate layer (100A) and a lower light-shielding layer (L210A) disposed on a lower surface of the substrate layer (100A).

[0052] The upper shading layer (U210A) and the lower shading layer (L210A) may be formed of the same material. The upper shading layer (U210A) and the lower shading layer (L210A) may be formed of different materials. The upper shading layer (U210A) and the lower shading layer (L210A) may have the same thickness. If necessary, the upper shading layer (U210A) and the lower shading layer (L210A) may be formed of different thicknesses.

[0053] The upper shading layer (U210A) and the lower shading layer (L210A) may be formed by printing functional ink on the upper and lower surfaces of the substrate layer (100A).

[0054] The upper shading layer (U210A) and the lower shading layer (L210A) may have surfaces with irregular irregularities and short periods. There is no particular limitation on the material as long as it is a material (or material) that can prevent the transmission of light incident on the upper and lower surfaces of the substrate layer (100A). However, when a plurality of shading blades overlap and operate, it may be preferable to blacken the surface of the first shading layer (U210A) and the second shading layer (L210A) to have a low surface reflectance (i.e., to increase the blackness or blackness) in order to prevent light from leaking (or passing) between the shading blades. Here, the blackening can absorb light to lower the surface reflectance.

[0055] FIGS. 5A and 5B are exemplary cross-sectional views of an aperture blade according to a fifth embodiment of the present invention. As illustrated, the aperture blade according to the fifth embodiment includes a substrate layer (100B) having upper and lower surfaces facing each other, and a light-shielding layer (200B) provided on an upper surface of the substrate layer (100B). The light-shielding layer (200B) may include black carbon (210B) and a filler (220B) having a relatively smaller particle size than the black carbon (210B). An antistatic layer (230B) may be applied to an upper portion of the light-shielding layer (200B). At this time, the filler (220B) may be formed by including at least one of Si, F, O, and C.

[0056] Fig. 6 is an exemplary cross-sectional view of an aperture blade according to a sixth embodiment of the present invention. A first shading layer (U200C) is disposed on an upper portion of a substrate layer (100C), and a first antistatic layer (U230C) is disposed on an upper surface of the first shading layer (U200C). A second shading layer (L200C) is disposed on a lower portion of the substrate layer (100C), and a second antistatic layer (L230C) is disposed on a lower surface of the second shading layer (L200C). By disposing the first antistatic layer (U230C) and the second antistatic layer (L230C) on the uppermost and lowermost surfaces of the blade, respectively, the generation of static electricity can be minimized even when the blade is operated frequently.

[0057] As described above, the aperture blade according to the present invention can improve reflectivity and prevent the inflow of foreign substances by forming an antireflection layer and a protective layer composed of multiple layers of high-refractive index and low-refractive index thin films on the upper and lower portions of the substrate layer. In addition, an antistatic layer can be formed on the upper portion of the substrate layer to suppress the generation of static electricity during blade operation.

[0058] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0059] The mode for carrying out the invention has been sufficiently described in the above-mentioned “Best mode for carrying out the invention.”

[0060] The aperture blade according to the embodiment can be used in a portable terminal such as a mobile phone or PDA.

Claims

1. A substrate layer having upper and lower surfaces facing each other; and An aperture blade including a first anti-reflection layer provided on the upper surface of the above substrate layer.

2. An aperture blade according to claim 1, further comprising a first protective layer disposed on the upper surface of the first anti-reflection layer.

3. In paragraph 2, A second anti-reflection layer disposed on the lower surface of the above substrate layer; and An aperture blade including a second protective layer disposed on the lower surface of the second anti-reflection layer.

4. In the third paragraph, the first anti-reflection layer and the second anti-reflection layer are an aperture blade including at least one low-refractive-index thin film layer and at least one high-refractive-index thin film layer alternately laminated.

5. An aperture blade in the fourth paragraph, wherein the low-refractive-index thin film layer is formed closer to the substrate layer than the high-refractive-index thin film layer.

6. An aperture blade in the fifth paragraph, wherein the low-refractive-index thin film layer comprises SiO2, and the high-refractive-index thin film layer comprises TiO2.

7. In the third paragraph, the first protective layer and the second protective layer are aperture blades containing a fluorine-based material.

8. An aperture blade in the first paragraph, wherein the substrate layer is in the form of a film containing at least one material selected from polyethylene terephthalate (PET), polyethylene naphthalate, polyimide, aramid, polyphenylene sulfide, and polyether sulfone.

9. In the 8th paragraph, the substrate layer has a thickness of 5 ㎛ to 200 ㎛.

10. A substrate layer having upper and lower surfaces facing each other; and Including a first light-shielding layer disposed on the upper surface of the above-mentioned substrate layer, An aperture blade wherein the first shading layer comprises black carbon and a filler having a relatively smaller particle size than the black carbon.

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