Foreign matter-preventing adhesive tape for camera module capable of capturing foreign matters

Abstract

The present invention relates to an anti-foreign-matter adhesive tape for a camera module, which prevents an installed lens from being contaminated by effectively capturing a foreign matter that may exist in a device such as a VCM camera module that does not contain a foreign matter. The present invention relates to an adhesive tape for preventing foreign matter from flowing into a camera module, the adhesive tape preventing foreign matter from flowing into the camera module by sealing an opening part of a camera module body to which a camera lens is mounted from an external environment, the opening part exposing the camera lens, the adhesive tape comprising: a base film; and an adhesive coating layer formed on one surface of the base film and including an adhesive pattern formed on the surface thereof. The adhesive tape is attached in a manner of sealing the opening part of the camera module body, and is attached in a manner that the bonding pattern faces the inner surface of the camera module body. Therefore, floating foreign matters in the closed space can be effectively removed through the adhesive coating layers formed on the two surfaces of the foreign matter prevention adhesive tape for capturing the foreign matters, thereby having the advantage that the performance of a lens arranged in the camera module can be improved.

Description

Technical Field

[0001] This invention relates to a foreign object protection tape for camera modules that prevents the installed lens from being contaminated by effectively capturing foreign objects that may be present in devices such as VCM camera modules that cannot contain foreign objects. Background Technology

[0002] Typically, lenses installed in mobile phones, PDAs, digital cameras, and other devices that are capable of precisely capturing images should meet the requirements of high pixel count and high image quality. Such devices require a mechanism for autofocusing, such as an actuator that uses a voice coil motor (VCM) for accurate focusing.

[0003] On the other hand, if foreign objects penetrate (capture) into the lens during the process of installing the camera module with the lens into the product, it will cause fatal defects to the product. Therefore, in order to prevent foreign objects from penetrating into the inserted lens, anti-foreign object tape should be applied to the opening of the exposed part of the module before the product assembly process is carried out.

[0004] However, after the foreign object protection tape is applied, the floating objects that have flowed into the sealed space between the tape and the lens are trapped in the sealed space. During the floating process, they will adhere to the surface of the lens and cause lens malfunctions.

[0005] Existing technical documents

[0006] Patent documents

[0007] Korean Patent Publication No. 10-2010-0066809 Summary of the Invention

[0008] Technical issues

[0009] The object of the present invention is to provide a foreign object trapping tape for a camera module, which forms an adhesive coating on at least the portion of the tape exposed in the enclosed space in a manner that has adhesive force capable of trapping foreign objects floating in the enclosed space inside the camera module body.

[0010] Furthermore, another object of the present invention is to provide a foreign object protection tape for a camera module in which the adhesive coating formed on the foreign object protection tape is configured with an uneven shape to expand the surface area capable of capturing floating objects.

[0011] Furthermore, other objects of the present invention can be achieved by referring to the detailed description of the invention with reference to the accompanying drawings.

[0012] Technical solution

[0013] To achieve the above objectives, the present invention provides a foreign object prevention tape for a camera module, which prevents foreign matter from entering by sealing the opening of the camera lens mounted on the camera module body from the external environment. The tape comprises: a base film; and an adhesive coating formed on one side of the base film, including an adhesive pattern formed on the surface. The tape is attached in a manner that seals the opening of the camera module body, and the adhesive pattern is attached towards the inner surface of the camera module body.

[0014] Furthermore, as another embodiment of the present invention, the adhesive pattern of the camera module anti-foreign object tape of the present invention may include a plurality of raised and recessed patterns.

[0015] Furthermore, as another embodiment of the present invention, the embossed pattern of the adhesive coating of the camera module anti-foreign object tape of the present invention can be an engraved shape.

[0016] Furthermore, as another embodiment of the present invention, the method for preparing the anti-foreign object tape for camera modules of the present invention includes the following steps: forming a three-dimensional patterned layer on a support film; preparing an intermediate by forming a release layer on the surface of the three-dimensional patterned layer; forming an adhesive coating on the release layer surface of the intermediate; attaching a base film to the surface of the adhesive coating; and separating the intermediate from the adhesive coating. The three-dimensional patterned layer is formed by the following steps: applying a photocurable resin to the pattern space formed by the support film and the rigid mold forming the pattern in close contact with each other for a first ultraviolet curing; and after the intermediate cured material formed by the first ultraviolet curing is detached from the rigid mold, a second ultraviolet curing is performed.

[0017] The effects of the invention

[0018] According to the camera module anti-foreign object tape of the present invention as described above, foreign objects floating in a confined space can be effectively removed by the adhesive coatings formed on both sides of the anti-foreign object tape for capturing foreign objects, thereby having the advantage of improving the performance of the lens installed in the camera module. Attached Figure Description

[0019] Figure 1 This invention illustrates an embodiment of a camera module anti-foreign object tape.

[0020] Figure 2 This illustrates the application of the tape of the present invention to the camera module body.

[0021] Figure 3 The process of preparing the three-dimensional patterned layer for the camera module anti-foreign object tape of the present invention is shown.

[0022] Figure 4 This invention illustrates a method for preparing anti-foreign object tape for camera modules according to an embodiment of the present invention.

[0023] Figure 5 Part (a) shows the camera module body with the tape attached according to the embodiment. Figure 5 Part (b) shows the camera module body with the base film of the comparative example attached.

[0024] Figure 6 Part (a) is a cross-sectional view of the tape camera module body of the attached embodiment. Figure 6 Part (b) is a cross-sectional view of the camera module body with the base film of the comparative example attached.

[0025] Figure 7 Part (a) is a cross-sectional view of the tape from the embodiment where the camera module body is separated. Figure 7 Part (b) is a cross-sectional view of the base film of the comparative example separated from the camera module body.

[0026] Explanation of reference numerals in the attached figures

[0027] 10: Base film; 20: Adhesive coating

[0028] 100: Tape 110: Camera module body

[0029] 200: Light-curable resin injection section Detailed Implementation

[0030] One embodiment of the present invention relates to a foreign object protection tape for a camera module capable of capturing foreign objects.

[0031] The camera module anti-foreign object tape of the present invention is used as an anti-foreign object tape for sealing the opening of the module body, the tape including an adhesive coating formed on a base film and one side of the base film.

[0032] Figure 1 An anti-foreign object tape (or adhesive tape) for a camera module according to an embodiment of the present invention is shown. Referring to the... Figure 1 The tape 100 includes a base film 10 and an adhesive coating 20 formed on one side of the base film 10.

[0033] Figure 2 This illustrates the case where the tape of the present invention is applied to the camera module body. Referring to the description... Figure 2 The tape 100 of the present invention is attached in such a way as to seal the opening of the camera module body 110, and is attached in such a way that the adhesive pattern of the adhesive coating 20 faces the inner surface (closed space S) of the camera module body.

[0034] In one embodiment, the tape includes a base film and an adhesive coating formed on one side of the base film.

[0035] In one embodiment, the base film may comprise polyethylene terephthalate (PET). When the base film is included, it can exhibit excellent transparency and durability, as well as excellent adhesion to the adhesive coating.

[0036] In one embodiment, the thickness of the base film can be 5–200 μm. Under these conditions, excellent durability can be achieved. For example, the thickness of the base film can be 30–500 μm, 50–500 μm, 60–500 μm, or 80–500 μm.

[0037] In one embodiment, the adhesive coating can be formed by photocuring a photocurable adhesive composition. When the adhesive coating is formed by photocuring the adhesive composition, it exhibits excellent durability and adhesion stability, adheres easily to the module, prevents lifting, prevents external impurities from entering the sealed space of the module, and allows for easy removal of foreign objects present inside the sealed space.

[0038] In one embodiment, the adhesive composition may comprise a (meth)acrylic acid copolymer, an acrylic acid oligomer, and a photoinitiator. In this invention, (meth)acrylic acid may represent acrylic acid and / or methacrylic acid.

[0039] In one embodiment, the (meth)acrylate copolymer may comprise a copolymer of a light-curable (ultraviolet (UV) acrylate monomer and acrylic acid. The light-curable (meth)acrylate monomer may comprise methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, sec-butyl methacrylate, tert-butyl methacrylate, 2-ethylhexyl methacrylate, and dodecyl methacrylate. One or more of the following: tridecyl methacrylate, stearate methacrylate, cyclohexyl methacrylate, benzyl methacrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl 2-hydroxypropyl methacrylate, 2-methoxyethyl methacrylate, 2-ethoxyethyl methacrylate, 2-butoxyethyl methacrylate, 2-phenoxyethyl methacrylate, allyl methacrylate, glycidyl methacrylate, and dimethylaminoethyl methacrylate.

[0040] In one embodiment, the weight-average molecular weight of the (meth)acrylic acid copolymer can be 5000–50000 g / mol. Under these conditions, the composition exhibits excellent miscibility and dispersibility, while the adhesive layer also demonstrates excellent durability and mechanical properties.

[0041] In one embodiment, the acrylic oligomer may comprise one or more of polyurethane acrylate oligomers, epoxy acrylate oligomers, and silicone acrylate oligomers.

[0042] The photoinitiator may comprise one or more of 2-hydroxy-2-methyl-1-phenylpropane-1-benzophenone, 1-hydroxycyclohexylphenyl ketone, benzophenone, 1-(4-isopropylphenyl)-2-hydroxy-2-methyl-1-one, 1-[4-(2-hydroxyethoxy)phenyl]-2-hydroxy-2-methylpropane-1-one, α,α-diethoxyacetophenone, 2,2-diethoxy-1-phenylacetophenone, and bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide.

[0043] In one embodiment, the composition may further comprise a solvent. In one embodiment, the solvent may comprise one or more of water, alcohol solvents, ketone solvents, amide solvents, and ether solvents.

[0044] The alcohol solvent may include one or more of methanol, ethanol, isopropanol, and butanol. The ketone solvent may include one or more of acetone, methyl ethyl ketone, and methyl isobutyl ketone. The amide solvent may include one or more of N-methyl-2-pyrrolidone (NMP), dimethylacetamide (DMAC), and dimethylformamide (DMF). The ether solvent may include one or more of a cellosolver, cellosolver acetate, and butyl cellosolver.

[0045] When the adhesive composition includes the conditions described above, the adhesive coating exhibits excellent chemical resistance, transparency, and adhesion, is easy to adhere to the module and prevents lifting, and is easy to adhere to the adhesive layer to remove foreign matter present inside the enclosed space.

[0046] In one embodiment, the thickness of the adhesive coating can be 20–200 μm. Under these conditions, it exhibits excellent adhesion to the module and facilitates the removal of foreign matter within the module's enclosed space. For example, the thickness of the adhesive coating can be 30–200 μm, 50–200 μm, 60–200 μm, or 80–200 μm.

[0047] Furthermore, as another embodiment of the present invention, the adhesive coating of the camera module anti-foreign object tape of the present invention may include multiple embossed patterns. Under these conditions, the adhesion to the module is excellent, thereby preventing external impurities from inserting into the sealed space of the module. The increased surface area of ​​the adhesive coating also effectively removes foreign objects present inside the sealed space of the module. For example, the adhesive coating may be densely and continuously formed with multiple embossed shapes.

[0048] Furthermore, as another embodiment of the present invention, the raised and recessed pattern of the adhesive coating of the camera module anti-foreign object tape of the present invention can be an engraved shape. Under these conditions, the effect of increasing the surface area of ​​the adhesive coating is excellent, thereby easily removing foreign objects present inside the sealed space of the module to which the adhesive coating adheres. When subjected to external impact, impurities are trapped in the grooves of the engraved pattern and are not separated, thereby achieving excellent removal efficiency.

[0049] Referring to the above Figure 1 The height H of the embossed pattern relative to the bottom surface can be 20–200 μm. Under these conditions, it exhibits excellent adhesion to the module, preventing external impurities from inserting into the module's enclosed space. It can easily remove foreign objects present within the module's enclosed space. When subjected to external impact, impurities are trapped within the grooves of the embossed pattern and do not separate, thus achieving excellent removal efficiency. For example, the height H of the embossed pattern relative to the bottom surface can be 30–200 μm, 50–200 μm, 60–200 μm, or 80–200 μm.

[0050] In one embodiment, the convex-concave cross-section can be a semi-circular shape. Under these conditions, it exhibits excellent adhesion to the module, preventing external impurities from inserting into the module's enclosed space. It can easily remove foreign objects present within the module's enclosed space. When subjected to external impact, impurities are trapped in the grooves of the etched pattern and not separated, thus achieving excellent removal efficiency. For example, the convex-concave pattern can be a concave mirror shape with a semi-circular cross-section.

[0051] Referring to the above Figure 1 The width W of the unevenness can be 5–500 μm. Under these conditions, the effect of increasing the surface area of ​​the adhesive coating is excellent, preventing external impurities from inserting into the sealed space of the module, and easily removing foreign objects present inside the sealed space of the module by adhering to the adhesive coating. For example, it can be 5–500 μm, 20–500 μm, 50–500 μm, or 90–500 μm.

[0052] Another embodiment of the present invention provides a method for preparing an anti-foreign object tape for a camera module. The method includes: step S10, forming a three-dimensional patterned layer on a support film; step S20, preparing an intermediate by forming a release layer on the surface of the three-dimensional patterned layer; step S30, forming an adhesive coating on the release layer surface of the intermediate; step S40, attaching a base film to the surface of the adhesive coating; and step S50, separating the intermediate from the adhesive coating.

[0053] In step S10, the three-dimensional pattern layer is formed by the following steps: step S11, applying a photocurable resin to the pattern space formed by the support film and the rigid mold forming the pattern to perform a first UV curing; and step S12, after removing the intermediate cured material formed by the first UV curing from the rigid mold, performing a second UV curing.

[0054] The following Figure 3 The process of preparing the three-dimensional patterned layer for the anti-foreign object tape used in the camera module of the present invention is shown. Figure 4 This invention illustrates a method for preparing anti-foreign object tape for a camera module according to an embodiment of the present invention.

[0055] Reference Figure 3 A PET film is provided as a support film. A photocurable acrylic resin composition is supplied to the pattern space formed by the support film and the rigid mold forming the pattern through the photocurable resin supply section 200, and a first ultraviolet curing process is performed. After the intermediate cured material that has been cured for the first time on the surface of the support film is separated from the rigid mold, a second ultraviolet curing can be performed to form a three-dimensional pattern layer.

[0056] Referring to the above Figure 3 The support film 101 can be supplied in one direction by the first supply roller 1. Furthermore, a photocurable resin can be coated in the pattern space formed by the support film 101 and the rigid mold 2 being tightly attached to each other.

[0057] In one embodiment, the photocurable resin may comprise a photocurable acrylic resin composition, but is not limited thereto. The acrylic resin composition may comprise (meth)acrylic copolymers, acrylic oligomers, photoinitiators, and solvents, but is not limited thereto.

[0058] As described Figure 3 As shown, the rigid mold 2 can form a pattern corresponding to the concave and convex shape on its outer peripheral surface. For example, the rigid mold can be a roller shape with a pattern corresponding to the concave and convex shape formed on its outer peripheral surface.

[0059] Referring to the above Figure 4 Part (a) can form a three-dimensional pattern layer 102 on the support film 101 as a concave-convex pattern corresponding to the pattern space between the rigid mold and the support film.

[0060] As described Figure 3 and Figure 4As shown in part (a), after the photocurable resin is coated in the pattern space, the first ultraviolet curing is performed by the first ultraviolet irradiation section 3. After the intermediate cured material of the first curing is removed from the rigid mold, it is cured for the second time by the second ultraviolet irradiation section 4, thereby forming a three-dimensional pattern layer 102 including multiple concave and convex patterns.

[0061] The first UV curing step can be performed by irradiating the patterned space with UV light in the first UV irradiation section 3 after applying a photocurable resin. During this first UV curing, the intermediate cured product is easily formed, exhibiting excellent durability and dimensional stability. For example, as described... Figure 3 As shown, this can be implemented in the first ultraviolet irradiation unit 3 by irradiating the pattern space with ultraviolet light.

[0062] The second UV curing step can be performed by irradiating the intermediate cured material from the first curing stage into the second UV irradiation section 4 with ultraviolet light after the material has been removed from the rigid mold. During this second UV irradiation, the three-dimensional patterned layer is easily formed, resulting in excellent durability and dimensional stability. For example, as... Figure 3 As shown, this can be implemented in the second ultraviolet irradiation section 4 by irradiating the first-cured intermediate curing material with ultraviolet light.

[0063] The surface of the three-dimensional pattern layer 102 can be formed with a pattern corresponding to the adhesive coating of the present invention. For example, the surface of the three-dimensional pattern layer 102 can be formed with a relief pattern corresponding to the adhesive coating 20.

[0064] Referring to the above Figure 4 In part (b) of step S20, a release agent is applied to the surface of the stereographic layer 102 to form a release layer 103, thereby preparing an intermediate 104. For example, the release layer 103 can be formed using a silicone-based release agent. When the release layer 103 is formed, the stereographic layer 102 is easily separated from the adhesive coating 20 described later, thereby easily preparing an anti-foreign matter tape.

[0065] Release layer 103 can be formed by applying the silicone-based release agent to a gravure roller via microgravure coating, followed by drying and curing.

[0066] Referring to the above Figure 4 In part (c), in step S30, the adhesive coating 20 can be formed by curing after the adhesive composition is applied to the surface of the release layer 103 of the intermediate 104. In one embodiment, the adhesive composition may comprise a photocurable adhesive composition.

[0067] In one embodiment, the adhesive composition may comprise a (meth)acrylic copolymer, an acrylic oligomer, and a photoinitiator. The adhesive composition may contain the same components as described above. Curing may be performed by ultraviolet curing.

[0068] For example, the adhesive composition can be applied using rod coating, comma coating, roller coating, flow coating, dip coating, blade coating, doctor blade coating, etc., followed by drying and curing.

[0069] Referring to the above Figure 4 In part (d), during step S40, a base film 10 may be attached to the surface of the adhesive coating 20. The base film may be the same as described above.

[0070] Referring to the above Figure 4 In part (e), in step S50, the anti-foreign object tape can be prepared by separating the intermediate 104 from the adhesive coating 20.

[0071] According to the present invention, the anti-foreign object tape for camera modules can effectively remove floating foreign objects in a confined space by means of the foreign object-catching adhesive coating formed on both sides of the anti-foreign object tape, thereby having the advantage of improving the performance of the lens installed in the camera module.

[0072] The structure and function of the present invention will be described in more detail below through preferred embodiments. However, these are merely examples of preferred embodiments of the present invention and should not be construed as limiting the present invention in any way. Content that can be deduced by analogy by those skilled in the art to which this invention pertains will be omitted herein.

[0073] Example

[0074] like Figure 3 As shown, a support film (PET) 101 is supplied in one direction by a first supply roller 1, and a photocurable resin is coated in the pattern space formed by the support film 101 and the rigid mold 2 being tightly attached to each other.

[0075] As described Figure 3 As shown, after the photocurable acrylic resin composition is supplied to the pattern space through the photocurable resin injection section 200, an intermediate cured product is prepared by performing a first ultraviolet curing process through the first ultraviolet irradiation section 3. After the intermediate cured product is detached from the rigid mold, a second ultraviolet curing process is performed through the second ultraviolet irradiation section 4, as follows. Figure 4 As shown in part (a), a three-dimensional pattern layer 102 comprising a plurality of raised and recessed patterns is formed on one side of the support film 101.

[0076] Then, as Figure 4As shown in part (b), an intermediate 104 is prepared by forming a release layer 103 using microgravure printing on the surface of the stereoscopic pattern layer 102 with a silicone-based release agent. Then, as... Figure 4 As shown in section (c), after the adhesive composition is applied in a comma pattern to the surface of the release layer 103 of intermediate 104, an adhesive coating 20 is formed by photocuring. The adhesive composition comprises a (meth)acrylic copolymer, an acrylic oligomer, a photoinitiator, and a solvent.

[0077] Then, as Figure 4 As shown in part (d), after the base film 10 is attached to the surface of the adhesive coating 20, as Figure 4 As shown in section (e), the anti-foreign matter tape is prepared by separating the intermediate 104 from the adhesive coating 20. In this case, as... Figure 1 As shown, the adhesive pattern of the adhesive coating 20 is formed as a plurality of concave and convex patterns (concave mirror shape with a semi-circular cross section) with an engraved shape having a height H of 90 μm and a width W of 90 to 500 μm.

[0078] Then, as Figure 2 As shown, the tape 100 is attached to seal the opening of the camera module body 110, with the textured surface of the adhesive coating 20 facing the inner surface (sealed space S) of the camera module body.

[0079] Comparative example

[0080] The opening of the camera module body is sealed using only the base film (PET) of the embodiment described above. The base film is applied after a known adhesive is coated on the portion that contacts the outer peripheral surface of the opening.

[0081] The following Figure 5 Part (a) shows the camera module body with the tape attached according to the embodiment. Figure 5 Part (b) shows the camera module body with the base film of the comparative example attached.

[0082] The following Figure 6 Part (a) is a cross-sectional view of the tape camera module body of the attached embodiment. Figure 6 Part (b) is a cross-sectional view of the camera module body with the base film of the comparative example attached. Figure 7 Part (a) is a cross-sectional view of the tape from the embodiment where the camera module body is separated. Figure 7 Part (b) is a cross-sectional view of the base film of the comparative example separated from the camera module.

[0083] Referring to the above Figure 6 and Figure 7As a result, the camera module body of the tape in the embodiment can easily remove foreign objects by combining them with the adhesive pattern in the enclosed space formed inside. When subjected to external impact, the foreign objects are trapped in the grooves of the engraved pattern and are not separated, thus having excellent removal efficiency. However, in the comparative example, it can be seen that no foreign objects can be removed in the enclosed space.

[0084] Simple variations and modifications of the present invention can be easily implemented by those skilled in the art to which this invention pertains, and such variations or modifications should be considered to be included within the scope of the present invention.

Claims

1. A foreign object prevention tape for a camera module, used to prevent foreign objects from entering through the opening of the exposed camera lens of the camera module body on which the camera lens is mounted, thereby sealing it from the external environment; characterized in that... The tape includes: Base film; and An adhesive coating, formed on one side of the base film, includes an adhesive pattern formed on the surface. The tape is attached in a manner that seals the opening of the camera module body, with the adhesive pattern facing the inner surface of the camera module body.

2. The anti-foreign object tape for camera modules according to claim 1, characterized in that, The bonding pattern includes multiple raised and recessed patterns.

3. The anti-foreign object tape for camera modules according to claim 2, characterized in that, The raised and recessed patterns are engraved shapes.

4. A method for preparing an anti-foreign object tape for a camera module, characterized in that, Includes the following steps: A three-dimensional patterned layer is formed on the support film; The intermediate is prepared by forming a release layer on the surface of the three-dimensional patterned layer; An adhesive coating is formed on the release layer surface of the intermediate; A base film is attached to the surface of the adhesive coating; as well as Separate the intermediate from the adhesive coating. The three-dimensional pattern layer is formed through the following steps: A photocurable resin is applied to the pattern space formed by the close contact between the support film and the rigid mold forming the pattern for the first ultraviolet curing; and After the intermediate cured material formed by the first UV curing is removed from the rigid mold, a second UV curing is performed.

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