WO2020082422A1 - Hard disk fixing apparatus having electromagnetic interference shielding function - Google Patents

Hard disk fixing apparatus having electromagnetic interference shielding function Download PDF

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Publication number
WO2020082422A1
WO2020082422A1 PCT/CN2018/114264 CN2018114264W WO2020082422A1 WO 2020082422 A1 WO2020082422 A1 WO 2020082422A1 CN 2018114264 W CN2018114264 W CN 2018114264W WO 2020082422 A1 WO2020082422 A1 WO 2020082422A1
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parts
hard disk
box body
electromagnetic shielding
shielding function
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PCT/CN2018/114264
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French (fr)
Chinese (zh)
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顾俊兰
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苏州市英酷莱德信息科技有限公司
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Publication of WO2020082422A1 publication Critical patent/WO2020082422A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/18—Packaging or power distribution
    • G06F1/183—Internal mounting support structures, e.g. for printed circuit boards, internal connecting means
    • G06F1/187—Mounting of fixed and removable disk drives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/346—Clay
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0091—Complexes with metal-heteroatom-bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/10—Esters; Ether-esters
    • C08K5/101—Esters; Ether-esters of monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C08K5/19—Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/41—Compounds containing sulfur bound to oxygen
    • C08K5/42—Sulfonic acids; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
    • G11B33/1493—Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds
    • C08K2003/164—Aluminum halide, e.g. aluminium chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/321—Phosphates
    • C08K2003/324—Alkali metal phosphate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/32—Phosphorus-containing compounds
    • C08K2003/329—Phosphorus containing acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/02—Flame or fire retardant/resistant
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation

Definitions

  • the invention relates to a hard disk fixing device with electromagnetic shielding function.
  • the hard disk is one of the main storage media of the computer. It is composed of one or more aluminum or glass discs, and the discs are covered with ferromagnetic materials.
  • the object of the present invention is to provide a hard disk fixing device with an electromagnetic shielding function.
  • the box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body further includes an outer protective layer, which has corrosion resistance , Anti-oxidation, flame retardant, thermal insulation performance, can play a very good role in protecting the electromagnetic shielding layer.
  • the technical solution of the present invention is to design a hard disk fixing device with an electromagnetic shielding function, including: a cabinet, a flat hard disk installed inside the cabinet, and a flat rectangular fixing frame set on the hard disk;
  • the fixing frame is fixed to the inner wall of the box body through a connecting piece;
  • the box body includes: an insulating layer, an electromagnetic shielding layer and an outer protective layer that are erected in order from inside to outside;
  • the outer protective layer is composed of the following components:
  • the fixing frame is an insulating fixing frame.
  • the connecting piece is an insulating connecting piece.
  • a hard disk fixing device with an electromagnetic shielding function is provided.
  • the box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body further includes an outer protective layer
  • the layer has anti-corrosion, anti-oxidation, flame retardant and thermal insulation properties, and can play a very good role in protecting the electromagnetic shielding layer.
  • a hard disk fixing device with electromagnetic shielding function includes: a box body, a flat hard disk set inside the box body, and a flat rectangular fixing frame set on the hard disk;
  • the fixing frame is fixed to the inner wall of the box body through a connecting piece;
  • the box body includes: an insulating layer, an electromagnetic shielding layer and an outer protective layer that are erected in order from inside to outside;
  • the outer protective layer is composed of the following components:
  • the fixing frame is an insulating fixing frame.
  • the connecting piece is an insulating connecting piece.
  • the box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body also includes an outer protective layer, which has corrosion resistance, oxidation resistance and flame retardancy 3. Heat insulation performance, can play a very good role in protecting the electromagnetic shielding layer.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Dispersion Chemistry (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Casings For Electric Apparatus (AREA)

Abstract

Disclosed in the present invention is a hard disk fixing apparatus having an electromagnetic interference shielding function, comprising: a box body, a horizontally-arranged hard disk provided inside the box body, and a horizontally-arranged rectangular fixing frame sleeved on the hard disk. The fixing frame is fixed to an inner wall of the box body by means of a connecting part. The box body comprises, vertically arranged sequentially from inside to outside: an insulating layer, an electromagnetic interference shielding layer, and an outer protection layer. In the hard disk fixing apparatus having an electromagnetic interference shielding function of the present invention, the box body comprises an electromagnetic interference shielding layer capable of reducing the impact of external electromagnetic radiation on the hard disk, and the box body further comprises an outer protection layer, said layer having corrosion resistance, anti-oxidization, flame retardant, and thermal insulation capabilities, thus being capable of protecting the electromagnetic interference shielding layer well.

Description

具有电磁屏蔽功能的硬盘固定装置Hard disk fixing device with electromagnetic shielding function 技术领域Technical field
本发明涉及具有电磁屏蔽功能的硬盘固定装置。The invention relates to a hard disk fixing device with electromagnetic shielding function.
背景技术Background technique
硬盘是电脑主要的存储媒介之一，由一个或者多个铝制或者玻璃制的碟片组成，碟片外覆盖有铁磁性材料。The hard disk is one of the main storage media of the computer. It is composed of one or more aluminum or glass discs, and the discs are covered with ferromagnetic materials.
为了保证硬盘的可靠工作，需要避免或减少外部电磁辐射对硬盘的影响。In order to ensure the reliable operation of the hard disk, the influence of external electromagnetic radiation on the hard disk needs to be avoided or reduced.
发明内容Summary of the invention
本发明的目的在于提供一种具有电磁屏蔽功能的硬盘固定装置，其箱体包括电磁屏蔽层，能减少外部电磁辐射对硬盘的影响，且箱体还包括外护层，外护层具有耐腐蚀、抗氧化、阻燃、隔热性能，能对电磁屏蔽层起到很好的保护作用。The object of the present invention is to provide a hard disk fixing device with an electromagnetic shielding function. The box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body further includes an outer protective layer, which has corrosion resistance , Anti-oxidation, flame retardant, thermal insulation performance, can play a very good role in protecting the electromagnetic shielding layer.
为实现上述目的，本发明的技术方案是设计一种具有电磁屏蔽功能的硬盘固定装置，包括：箱体，设于箱体内部的平置硬盘，以及套装于硬盘上的平置矩形固定框；In order to achieve the above object, the technical solution of the present invention is to design a hard disk fixing device with an electromagnetic shielding function, including: a cabinet, a flat hard disk installed inside the cabinet, and a flat rectangular fixing frame set on the hard disk;
所述固定框通过连接件与箱体内壁固定；The fixing frame is fixed to the inner wall of the box body through a connecting piece;
所述箱体包括由内至外依次竖置的：绝缘层、电磁屏蔽层和外护层；The box body includes: an insulating layer, an electromagnetic shielding layer and an outer protective layer that are erected in order from inside to outside;
按重量份计，所述外护层由以下组分组成：In terms of parts by weight, the outer protective layer is composed of the following components:
2.6 份肌醇六磷酸酯，2.6 parts phytate,
1.4 份丙二醇苯醚，1.4 parts propylene glycol phenyl ether,
0.8 份磷酸氢二钠，0.8 parts disodium hydrogen phosphate,
1.3 份二月桂酸二丁基锡，1.3 servings of dibutyltin dilaurate,
3.6 份甲氧基酯酸丙酯，3.6 parts propyl methoxyester,
8.9 份聚四氟乙烯，8.9 parts PTFE,
2.2 份二乙二醇单丁醚，2.2 parts of diethylene glycol monobutyl ether,
0.4 份六偏磷酸钠，0.4 parts sodium hexametaphosphate,
0.6 份聚合氯化铝，0.6 parts of polyaluminium chloride,
1.2 份聚烷基三烷基氯化铵，1.2 parts polyalkyltrialkylammonium chloride,
0.9 份亚硫酸钾，0.9 parts potassium sulfite,
0.4 份钠基膨润土，0.4 parts sodium-based bentonite,
1.8 份磺基琥珀酸二异辛脂钠。1.8 parts sodium diisooctylsulfosuccinate.
优选的，所述固定框为绝缘固定框。Preferably, the fixing frame is an insulating fixing frame.
优选的，所述连接件为绝缘连接件。Preferably, the connecting piece is an insulating connecting piece.
本发明的优点和有益效果在于：提供一种具有电磁屏蔽功能的硬盘固定装置，其箱体包括电磁屏蔽层，能减少外部电磁辐射对硬盘的影响，且箱体还包括外护层，外护层具有耐腐蚀、抗氧化、阻燃、隔热性能，能对电磁屏蔽层起到很好的保护作用。The advantages and beneficial effects of the present invention are as follows: a hard disk fixing device with an electromagnetic shielding function is provided. The box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body further includes an outer protective layer The layer has anti-corrosion, anti-oxidation, flame retardant and thermal insulation properties, and can play a very good role in protecting the electromagnetic shielding layer.
具体实施方式detailed description
下面结合实施例，对本发明的具体实施方式作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The specific implementation of the present invention will be further described below in conjunction with examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.
本发明具体实施的技术方案是：The technical solutions of the specific implementation of the present invention are:
一种具有电磁屏蔽功能的硬盘固定装置，包括：箱体，设于箱体内部的平置硬盘，以及套装于硬盘上的平置矩形固定框；A hard disk fixing device with electromagnetic shielding function includes: a box body, a flat hard disk set inside the box body, and a flat rectangular fixing frame set on the hard disk;
所述固定框通过连接件与箱体内壁固定；The fixing frame is fixed to the inner wall of the box body through a connecting piece;
所述箱体包括由内至外依次竖置的：绝缘层、电磁屏蔽层和外护层；The box body includes: an insulating layer, an electromagnetic shielding layer and an outer protective layer that are erected in order from inside to outside;
按重量份计，所述外护层由以下组分组成：In terms of parts by weight, the outer protective layer is composed of the following components:
2.6 份肌醇六磷酸酯，2.6 parts phytate,
1.4 份丙二醇苯醚，1.4 parts propylene glycol phenyl ether,
0.8 份磷酸氢二钠，0.8 parts disodium hydrogen phosphate,
1.3 份二月桂酸二丁基锡，1.3 servings of dibutyltin dilaurate,
3.6 份甲氧基酯酸丙酯，3.6 parts propyl methoxyester,
8.9 份聚四氟乙烯，8.9 parts PTFE,
2.2 份二乙二醇单丁醚，2.2 parts of diethylene glycol monobutyl ether,
0.4 份六偏磷酸钠，0.4 parts sodium hexametaphosphate,
0.6 份聚合氯化铝，0.6 parts of polyaluminium chloride,
1.2 份聚烷基三烷基氯化铵，1.2 parts polyalkyltrialkylammonium chloride,
0.9 份亚硫酸钾，0.9 parts potassium sulfite,
0.4 份钠基膨润土，0.4 parts sodium-based bentonite,
1.8 份磺基琥珀酸二异辛脂钠。1.8 parts sodium diisooctylsulfosuccinate.
优选的，所述固定框为绝缘固定框。Preferably, the fixing frame is an insulating fixing frame.
优选的，所述连接件为绝缘连接件。Preferably, the connecting piece is an insulating connecting piece.
本发明具有电磁屏蔽功能的硬盘固定装置，其箱体包括电磁屏蔽层，能减少外部电 磁辐射对硬盘的影响，且箱体还包括外护层，外护层具有耐腐蚀、抗氧化、阻燃、隔热性能，能对电磁屏蔽层起到很好的保护作用。The hard disk fixing device with electromagnetic shielding function of the present invention, the box body includes an electromagnetic shielding layer, which can reduce the influence of external electromagnetic radiation on the hard disk, and the box body also includes an outer protective layer, which has corrosion resistance, oxidation resistance and flame retardancy 3. Heat insulation performance, can play a very good role in protecting the electromagnetic shielding layer.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principles of the present invention, several improvements and retouches can be made. It should also be regarded as the protection scope of the present invention.

Claims (3)

  1. 具有电磁屏蔽功能的硬盘固定装置，其特征在于，包括：箱体，设于箱体内部的平置硬盘，以及套装于硬盘上的平置矩形固定框；The hard disk fixing device with electromagnetic shielding function is characterized by comprising: a box body, a flat hard disk set inside the box body, and a flat rectangular fixing frame set on the hard disk;
    所述固定框通过连接件与箱体内壁固定；The fixing frame is fixed to the inner wall of the box body through a connecting piece;
    所述箱体包括由内至外依次竖置的：绝缘层、电磁屏蔽层和外护层；The box body includes: an insulating layer, an electromagnetic shielding layer and an outer protective layer that are erected in order from inside to outside;
    按重量份计，所述外护层由以下组分组成：In terms of parts by weight, the outer protective layer is composed of the following components:
    2.6份肌醇六磷酸酯，2.6 parts phytate,
    1.4份丙二醇苯醚，1.4 parts propylene glycol phenyl ether,
    0.8份磷酸氢二钠，0.8 parts disodium hydrogen phosphate,
    1.3份二月桂酸二丁基锡，1.3 parts of dibutyltin dilaurate,
    3.6份甲氧基酯酸丙酯，3.6 parts propyl methoxyester,
    8.9份聚四氟乙烯，8.9 parts PTFE,
    2.2份二乙二醇单丁醚，2.2 parts of diethylene glycol monobutyl ether,
    0.4份六偏磷酸钠，0.4 parts sodium hexametaphosphate,
    0.6份聚合氯化铝，0.6 parts of polyaluminium chloride,
    1.2份聚烷基三烷基氯化铵，1.2 parts polyalkyltrialkylammonium chloride,
    0.9份亚硫酸钾，0.9 parts potassium sulfite,
    0.4份钠基膨润土，0.4 parts sodium base bentonite,
    1.8份磺基琥珀酸二异辛脂钠。1.8 parts of sodium diisooctylsulfosuccinate.
  2. 根据权利要求1所述的具有电磁屏蔽功能的硬盘固定装置，其特征在于，所述固定框为绝缘固定框。The hard disk fixing device with an electromagnetic shielding function according to claim 1, wherein the fixing frame is an insulating fixing frame.
  3. 根据权利要求1所述的具有电磁屏蔽功能的硬盘固定装置，其特征在于，所述连接件为绝缘连接件。The hard disk fixing device with an electromagnetic shielding function according to claim 1, wherein the connecting member is an insulating connecting member.
PCT/CN2018/114264 2018-10-25 2018-11-07 Hard disk fixing apparatus having electromagnetic interference shielding function WO2020082422A1 (en)

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Application Number Priority Date Filing Date Title
CN201811247592.1 2018-10-25
CN201811247592.1A CN109407778A (en) 2018-10-25 2018-10-25 Device for fixing hard disk with electro-magnetic screen function

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WO2020082422A1 true WO2020082422A1 (en) 2020-04-30

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PCT/CN2018/114264 WO2020082422A1 (en) 2018-10-25 2018-11-07 Hard disk fixing apparatus having electromagnetic interference shielding function

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LU101879B1 (en) 2020-07-13
CN109407778A (en) 2019-03-01

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