WO2020057447A1 - Machine optique de projection pour supprimer des interférences électromagnétiques - Google Patents

Machine optique de projection pour supprimer des interférences électromagnétiques Download PDF

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Publication number
WO2020057447A1
WO2020057447A1 PCT/CN2019/105789 CN2019105789W WO2020057447A1 WO 2020057447 A1 WO2020057447 A1 WO 2020057447A1 CN 2019105789 W CN2019105789 W CN 2019105789W WO 2020057447 A1 WO2020057447 A1 WO 2020057447A1
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WO
WIPO (PCT)
Prior art keywords
magnetic ring
electromagnetic interference
heat pipe
heat
heating element
Prior art date
Application number
PCT/CN2019/105789
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English (en)
Chinese (zh)
Inventor
陈斯伟
张坤
Original Assignee
晶晨半导体(上海)股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 晶晨半导体(上海)股份有限公司 filed Critical 晶晨半导体(上海)股份有限公司
Publication of WO2020057447A1 publication Critical patent/WO2020057447A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

  • the present invention relates to the technical field of optoelectronic instruments, and in particular, to a projection optical machine that suppresses electromagnetic interference (Electromagnetic Interference, EMI for short).
  • electromagnetic Interference Electromagnetic Interference
  • the heat dissipation structure of the projection light machine directly conducts electrical signals and electromagnetic signals with a material with a low thermal conductivity.
  • the power of the LED lamp in the projection light machine is provided by DC-DC.
  • the low-frequency radiation of DC-DC will pass through the copper material and aluminum.
  • the material's heat dissipation structure forms an antenna effect that amplifies radiation in space, causing the low frequency to seriously exceed the standard.
  • spraying conductive paint, wrapping conductive cloth, and wrapping copper foil paper are mainly used to suppress electromagnetic interference.
  • the sprayed conductive paint is not easy to drop. The above three methods need to be wrapped with conductive cotton. duration.
  • a light projector for suppressing electromagnetic interference includes a heating element, a heat conducting tube, and a radiator.
  • the heat conducting tube is connected between the heating element and the radiator, and is configured to conduct heat generated by the heating element to
  • the radiator further includes:
  • a magnetic ring is sleeved on the periphery of the heat pipe, and the ratio of the length of the magnetic ring to the exposed length of the heat pipe is 1:10.
  • the exposed length of the heat-conducting pipe is a length where the circumference of the heat-conducting pipe is completely exposed in the air.
  • the magnetic ring is made of a ferromanganese alloy or a zinc-iron alloy.
  • the thickness between the inner wall and the outer wall of the magnetic ring is between 1 mm and 4 mm.
  • the ratio of the diameter of the inner wall of the magnetic ring to the diameter of the heat pipe is 1: 1.1.
  • the heating element is a digital light processing unit.
  • the heating element is an LED light source.
  • the heat pipe is made of a copper material or an aluminum material.
  • the magnetic ring sleeve is placed on a side of the heat pipe adjacent to the heating element.
  • the assembly steps can be simplified and the time is short and the efficiency is high; the ratio of the length of the magnetic ring to the exposed length of the heat pipe is 1:10, which can be used on the basis of the smallest space It can effectively suppress electromagnetic interference caused by low-frequency radiation during the operation of the projector.
  • FIG. 1 is a schematic diagram of an embodiment of a projector light suppressing electromagnetic interference according to the present invention
  • FIG. 2 is an electromagnetic interference curve diagram of a magnetic ring projection optical machine without adding
  • FIG. 3 is an electromagnetic interference curve diagram of a projection light machine that suppresses electromagnetic interference according to the present invention.
  • the present invention provides a projector that suppresses electromagnetic interference, and includes a heating element 1, a heat conducting tube 3, and a heat sink 4.
  • the heat conducting tube 3 is connected to the heating element 1 and the heat sink. 4 for transmitting the heat generated by the heating element 1 to the heat sink 4 further including:
  • the magnetic ring 2 is sleeved on the periphery of the heat pipe 3, and the ratio of the length of the magnetic ring 2 to the exposed length of the heat pipe 3 is 1:10.
  • the magnetic ring 2 may be made of a ferromanganese alloy or a zinc-iron alloy.
  • the exposed length of the heat transfer tube 3 is the length of the circumference of the heat transfer tube 3 completely exposed in the air.
  • the magnetic ring 2 is located on the heat pipe 3 on the side adjacent to the heating element 1 so as to suppress electromagnetic interference.
  • the ability of the magnetic ring 2 to absorb interference is characterized by its impedance characteristics. It presents a very low inductive impedance value in the low frequency band and does not affect the transmission of useful signals on the data line or signal line.
  • the impedance increases, and its inductive and reactive components remain small, but the resistive weight increases rapidly, absorbing and dissipating high-frequency EMI interference energy in the form of thermal energy.
  • two keypoint frequencies are used: 25MHz and 100MHz, and the absorption characteristics of the EMI absorbing magnetic ring 2 are calibrated by resistance values at the keypoint frequencies.
  • the assembling steps can be simplified and the use time is short and the efficiency is high; the ratio of the length of the magnetic ring 2 to the exposed length of the heat pipe 3 can be 1:10.
  • the ratio of the length of the magnetic ring 2 to the exposed length of the heat pipe 3 can be 1:10.
  • the thickness between the inner wall and the outer wall of the magnetic ring 2 is between 1 mm and 4 mm.
  • the ratio of the diameter of the inner wall of the magnetic ring 2 to the diameter of the heat pipe 3 is 1: 1.1. This ratio is convenient for the magnetic ring 2 to fit into the periphery of the heat conducting tube 3, for example, when the diameter of the heat conducting tube 3 is 5 mm, the diameter of the inner wall of the magnetic ring 2 may be 5.5 mm.
  • the heating element 1 is a digital light processing unit.
  • the digital light processing unit uses a DMD (Digital Micromirror Device) chip, and the heat generated by the DMD chip can be introduced to the heat sink 4 through the heat pipe 3.
  • DMD Digital Micromirror Device
  • the heating element 1 is an LED light source.
  • the heat pipe 3 may be made of a copper material or an aluminum material.
  • both the copper material and the aluminum material have good electrical and thermal conductivity, and have good corrosion resistance.
  • the heat generated by the heating element 1 can be effectively conducted to the heat sink 4 to improve heat dissipation efficiency.
  • EN55032 is an EMC (Electromagnetic Compatibility) standard applicable to multimedia equipment with AC or DC rated voltage not exceeding 600V
  • the multimedia equipment is information equipment, audio equipment, video equipment, broadcast receiving equipment, entertainment light control equipment or A combination of the above equipment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Projection Apparatus (AREA)

Abstract

L'invention concerne une machine optique de projection destinée à supprimer des interférences électromagnétiques, comprenant un corps chauffant (1), un tuyau de conduction de chaleur (3) et un dispositif de dissipation de chaleur (4), le tuyau de conduction de chaleur (3) étant connecté entre le corps chauffant (1) et le dispositif de dissipation de chaleur (4) et utilisé pour conduire la chaleur produite par le corps chauffant (1) au dispositif de dissipation de chaleur (4) ; comprenant en outre : un anneau magnétique (2) prévu sur la périphérie externe du tuyau de conduction de chaleur (3) de manière lisse et un rapport entre la longueur de l'anneau magnétique (2) et la longueur exposée du tuyau de conduction de chaleur (3) est de 1: 10. La bague magnétique (2) est prévue sur la périphérie externe du tuyau de conduction de chaleur (3), de sorte que l'étape d'assemblage puisse être simplifiée, que la consommation de temps soit faible et que l'efficacité soit élevée. Le rapport entre la longueur de l'anneau magnétique (2) et la longueur exposée du tuyau de conduction de chaleur (3) est de 1:10, ce qui peut efficacement supprimer les interférences électromagnétiques provoquées par le rayonnement basse fréquence dans un processus de travail de la machine optique de projection sur la base de la minimisation d'un espace d'occupation.
PCT/CN2019/105789 2018-09-18 2019-09-12 Machine optique de projection pour supprimer des interférences électromagnétiques WO2020057447A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201811089864.XA CN109100906A (zh) 2018-09-18 2018-09-18 抑制电磁干扰的投影光机
CN201811089864.X 2018-09-18

Publications (1)

Publication Number Publication Date
WO2020057447A1 true WO2020057447A1 (fr) 2020-03-26

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PCT/CN2019/105789 WO2020057447A1 (fr) 2018-09-18 2019-09-12 Machine optique de projection pour supprimer des interférences électromagnétiques

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CN (1) CN109100906A (fr)
WO (1) WO2020057447A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109100906A (zh) * 2018-09-18 2018-12-28 晶晨半导体(上海)股份有限公司 抑制电磁干扰的投影光机

Citations (7)

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JP2007114405A (ja) * 2005-10-19 2007-05-10 Seiko Epson Corp 光学絞り装置、およびプロジェクタ
CN107316850A (zh) * 2017-08-15 2017-11-03 镇江巍华电子有限公司 一种电子散热器
CN207146811U (zh) * 2017-08-24 2018-03-27 广东美的制冷设备有限公司 空调器和用于其的电控装置
CN207181931U (zh) * 2017-08-31 2018-04-03 青岛小帅智能科技股份有限公司 投影仪和投影设备
CN207264093U (zh) * 2017-09-13 2018-04-20 深圳创维数字技术有限公司 散热组件和投影仪
CN207283510U (zh) * 2017-09-15 2018-04-27 深圳拓邦股份有限公司 一种滤波系统、具有滤波系统的电器及电磁炉
CN109100906A (zh) * 2018-09-18 2018-12-28 晶晨半导体(上海)股份有限公司 抑制电磁干扰的投影光机

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CN1609700A (zh) * 2003-10-20 2005-04-27 台达电子工业股份有限公司 投影机及用于投影机的遮光散热罩
JP2006251584A (ja) * 2005-03-14 2006-09-21 Funai Electric Co Ltd プロジェクタエンジン部構造
KR101266874B1 (ko) * 2008-05-20 2013-05-23 삼성전자주식회사 영상투사장치
CN206222541U (zh) * 2016-11-09 2017-06-06 广东美的制冷设备有限公司 空调室外机及具有其的空调器

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007114405A (ja) * 2005-10-19 2007-05-10 Seiko Epson Corp 光学絞り装置、およびプロジェクタ
CN107316850A (zh) * 2017-08-15 2017-11-03 镇江巍华电子有限公司 一种电子散热器
CN207146811U (zh) * 2017-08-24 2018-03-27 广东美的制冷设备有限公司 空调器和用于其的电控装置
CN207181931U (zh) * 2017-08-31 2018-04-03 青岛小帅智能科技股份有限公司 投影仪和投影设备
CN207264093U (zh) * 2017-09-13 2018-04-20 深圳创维数字技术有限公司 散热组件和投影仪
CN207283510U (zh) * 2017-09-15 2018-04-27 深圳拓邦股份有限公司 一种滤波系统、具有滤波系统的电器及电磁炉
CN109100906A (zh) * 2018-09-18 2018-12-28 晶晨半导体(上海)股份有限公司 抑制电磁干扰的投影光机

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