WO2014118856A1 - 電子回路装置および電子回路装置の製造方法 - Google Patents
電子回路装置および電子回路装置の製造方法 Download PDFInfo
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- WO2014118856A1 WO2014118856A1 PCT/JP2013/007348 JP2013007348W WO2014118856A1 WO 2014118856 A1 WO2014118856 A1 WO 2014118856A1 JP 2013007348 W JP2013007348 W JP 2013007348W WO 2014118856 A1 WO2014118856 A1 WO 2014118856A1
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- WIPO (PCT)
- Prior art keywords
- case
- electronic circuit
- circuit device
- height
- cylindrical portion
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 title description 11
- 229920005989 resin Polymers 0.000 claims abstract description 71
- 239000011347 resin Substances 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 description 16
- 230000004048 modification Effects 0.000 description 16
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V15/00—Protecting lighting devices from damage
- F21V15/01—Housings, e.g. material or assembling of housing parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
- F21V19/003—Fastening of light source holders, e.g. of circuit boards or substrates holding light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V33/00—Structural combinations of lighting devices with other articles, not otherwise provided for
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/03—Constructional details, e.g. casings, housings
- H04B1/034—Portable transmitters
-
- 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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
- H05K3/284—Applying non-metallic protective coatings for encapsulating mounted components
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10106—Light emitting diode [LED]
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/20—Details of printed circuits not provided for in H05K2201/01 - H05K2201/10
- H05K2201/2018—Presence of a frame in a printed circuit or printed circuit assembly
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49147—Assembling terminal to base
Definitions
- the present invention relates to an electronic circuit device in which an electronic component including a light emitting element on a circuit board is sealed with a transparent resin, and more particularly to an electronic key used in a remote control system for opening and closing a door.
- an electronic key used for a smart keyless entry a part of a case is formed of a transparent resin, and light emitted from an LED indicating an operation state of the electronic key is transmitted through the resin (for example, see Patent Document 1).
- electronic keys are required to be thin in addition to impact resistance and water resistance, and a card type in which a circuit board is sealed with a thermosetting resin has been developed (for example, Patent Document 2). See).
- JP 2004-153526 A Japanese Patent Laid-Open No. 2005-179942
- the amount of the poured resin varies depending on the product due to manufacturing errors. For this reason, the height of the translucent resin existing in the irradiation range of the light emitting element varies depending on the product, and there is a possibility that the luminance quality cannot be maintained.
- An object of the present invention is to provide an electronic circuit device that keeps the height of a translucent resin sealed in the irradiation direction of a light emitting element uniform regardless of the product and maintains the quality of the light emitting element.
- An electronic circuit device includes an upper case and a lower case constituting a housing, a circuit board placed on the lower case, and a hollow frame surrounding the circuit board.
- An electronic component having an inner case for sealing the inside by bonding an upper surface and a lower surface to the upper case and the lower case, and a light emitting element that emits light to the outside at least on the surface opposite to the mounting surface of the circuit board
- a translucent resin that is injected into the frame of the inner case to seal the electronic component and transmits the light emitted from the light emitting element to the outside, and the inner case has a light emitting element inside the frame.
- a cylindrical portion surrounding the cylindrical portion is provided, and the translucent resin injected into the cylindrical portion is higher than the translucent resin injected outside the cylindrical portion.
- the translucent resin poured from the tubular portion overflows from the tubular portion and is sealed at the height of the upper end of the tubular portion until the electronic component on the circuit board is sealed. Since it becomes constant, the quality of the light emitting element does not vary depending on the product and can be kept constant.
- the perspective view of the inner case of the electronic key in this embodiment Sectional view when the electronic key before resin injection is viewed from the direction of arrow B along the line AA in FIG.
- Sectional view when the electronic key after resin injection is viewed from the direction of arrow B in the section along line AA in FIG.
- the perspective view of the inner case in the modification 1 of the same FIG. Sectional drawing of the electronic key in the modification 1 of the same FIG. Enlarged perspective view of the cylindrical portion of FIG. Sectional drawing of the electronic key in the modification 2 of the same FIG.
- FIG. 1 is a perspective view of an inner case of an electronic key in the present embodiment.
- the inner case 10 is provided in the casing of the electronic key.
- the inner case 10 has a hollow frame 11 that is open at the top and bottom.
- a circuit board on which an electronic circuit is mounted is disposed inside the frame body 11.
- a thermosetting translucent resin is poured into the frame 11, and the circuit board is sealed with the resin.
- the inner case 10 has a hollow cylindrical portion 12 that surrounds the light emitting element.
- the cylindrical portion 12 is reinforced by a rib portion 13 extending from the side wall of the frame body 11.
- FIG. 2 is a cross-sectional view of the electronic key before resin injection when viewed from the direction of arrow B along the line AA in FIG.
- the inner case 10 is sealed by a lower case 20 and an upper case 30 that form a casing. That is, the lower surface of the frame body 11 is bonded to the C1 portion of the lower case 20, and the upper surface of the frame body 11 is bonded to the D portion of the upper case 30. For this reason, even if resin is injected into the frame 11, the resin does not leak out of the frame 11 from the C1 part and the D part.
- Positioning pins 21 are provided on the upper surface of the lower case 20.
- the frame 11 is disposed outside the positioning pin 21.
- the circuit board 40 is disposed inside the positioning pin 21.
- Various electronic components including the light emitting element 50 are mounted on the circuit board 40.
- the light emitting element 50 is configured by, for example, an LED.
- the lower surface of the circuit board 40 is placed on the upper surface of the lower case 20.
- the cylindrical portion 12 is configured to have a convex shape and includes a cylindrical body 121 and a protruding portion 122.
- the cylinder 121 has a mounting surface 123 that protrudes inward from the upper end of the cylinder 121.
- the height of the mounting surface 123 is equal to the height of the frame 11.
- the lower surface of the peripheral edge of the opening provided in the upper case 30 is mounted.
- the protrusion 122 protrudes upward from the inner end of the placement surface 123.
- the translucent resin is injected into the injection port 124 of the protrusion 122 from the X direction in FIG.
- the light emitting element 50 is surrounded by the cylindrical portion 12.
- the lower surface of the cylinder 121 is bonded to the C2 portion of the circuit board 40. For this reason, the resin injected into the cylindrical portion 12 does not leak out of the cylindrical portion 12 from the C2 portion.
- the resin When the resin is poured into the cylindrical portion 12 from the X direction in FIG. 2, the resin is accumulated in the space of the cylindrical body 121, and further, the resin is accumulated in the space of the injection port 124. The resin reaches the upper end of the protrusion 122. Further, when the resin injection is continued, the resin overflows from the upper end of the protruding portion 122 to the mounting surface 123 as shown in the Y direction. Then, the resin oozes out from the gap between the mounting surface 123 and the upper case 30, and the resin flows in the Z direction along the outer wall surface of the cylindrical body 121. For this reason, when the injection of the resin in the X direction is continued, the resin is gradually accumulated in the frame 11 of the inner case 10 from the lower case 20 side. And the electronic circuit on the circuit board 40 is sealed by the accumulated resin.
- Resin injection may be performed at least to the extent that this electronic circuit is sealed.
- the distance between the upper end of the electronic circuit on the circuit board 40 and the upper case 30 is designed to be as short as possible. This is almost synonymous with injecting the resin until it is almost satisfied.
- the electronic key as described above is manufactured in the following steps.
- the translucent resin is filled in the frame 11 of the inner case 10 by injecting the translucent resin into the cylindrical portion 12 in the X direction, and includes the light emitting element 50 of the circuit board 40. The process of sealing the component.
- the filling degree of the translucent resin can be injected while visually checking with a visual camera or a monitoring camera. can do.
- the step (2) may be omitted by applying an adhesive to the lower surface side of the frame body 11. Moreover, you may abbreviate
- the electronic key after resin injection is created by the above process.
- FIG. 3 is a cross-sectional view of the electronic key after resin injection when viewed from the direction of arrow B along the line AA in FIG.
- the tubular portion 12 is sealed with a translucent resin 60 up to the upper end of the projecting portion 122 and into the inner space of the frame 11 outside the tubular portion 12 up to the substantially upper end of the frame 11. It has been stopped.
- a translucent resin 60 is used for the translucent resin 60.
- the translucent resin 60 may be transparent or translucent. It is sufficient that at least the light emitted from the light emitting element 50 has a transmittance that is visible from the outside. The light emitted from the light emitting element 50 passes through the translucent resin 60 inside the cylindrical portion 12 and is irradiated to the outside.
- the height of the translucent resin 60 filled in the cylindrical portion 12 is constant up to the upper end of the protruding portion 122.
- the optical characteristics of the translucent resin 60 as a thin film do not vary depending on the product, so that the irradiation performance quality to the outside of the light emitting element 50 can be kept constant.
- the height of the translucent resin 60 filled in the cylindrical portion 12 is higher than the height of the translucent resin 60 filled outside the cylindrical portion 12.
- FIG. 4 is a perspective view of the inner case in Modification 1 of FIG.
- FIG. 5 is a cross-sectional view of the electronic key in the modification of FIG.
- FIG. 6 is an enlarged perspective view of the cylindrical portion of FIG.
- the inner case 10 according to the present modification has a different arrangement of the rib portions 14 compared to FIG. 1. That is, although the rib part 13 of FIG. 1 was set to the same height as the mounting surface 123, the height of the rib part 14 is lower than the mounting surface 123 in this modification. According to this modification, the effect is enhanced when the cylindrical portion 12 is provided with a notch. That is, as shown in FIGS. 5 and 6, a notch 125 is provided on the upper surface (the mounting surface 123 and the outer wall of the cylinder 121) of the cylinder 121 of the cylindrical part 12.
- region which can provide the notch part 125 can be made into the whole mounting surface 123 because the height of the rib part 14 becomes lower than the mounting surface 123 like this modification. For this reason, the freedom degree of design improves, for example, when providing the some notch part 125, or when providing two or more so that the mutually adjacent angle may become equal.
- FIG. 7 is a cross-sectional view of the electronic key in the modification of FIG.
- the cylindrical portion 15 has a convex shape inside, and includes a cylindrical body 131 and a protruding portion 132.
- the protruding portion 132 has a mounting surface 123 at the upper end, and the space between the cylindrical body 131 and the mounting surface 123 is tapered.
- the height of the cylindrical part 13 is comprised lower than the cylindrical part 12 of the said embodiment and the modification 1. FIG. Thereby, the quantity of the translucent resin 60 can be reduced.
- the upper case 70 is formed of, for example, a translucent resin 60 and is placed on the placement surface 123. For this reason, it is not necessary to provide an opening in the upper case 70, and the number of steps for providing the opening can be reduced.
- the translucent resin 60 poured from the cylindrical portions 12 and 15 overflows from the cylindrical portions 12 and 15 and is on the circuit board 40.
- the quality of the light emitting element 50 is kept constant without variation depending on the product because the height of the upper ends of the cylindrical portions 12 and 15 is constant before the electronic components are sealed. Can do.
- the electronic key is used as an example of the electronic circuit device of the present invention.
- the present invention can be applied to an electronic circuit device that emits light to the outside using the light emitting element 50.
- the electronic circuit device according to the present invention is useful for an electronic circuit device that notifies the state of the electronic circuit to the outside using a light emitting element such as a smart keyless electronic key.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Push-Button Switches (AREA)
- Led Device Packages (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
Description
(1)位置決めピン21を利用して下ケース20上に回路基板40を載置する工程。
(2)下ケース20のC1部分に接着剤を塗布する工程。
(3)インナーケース10をC1部分に載置して接着し、枠体11と下ケース20の隙間(C1部分の隙間)を密閉する工程。
(4)筒状部12に対してX方向に透光性樹脂を注入することで、インナーケース10の枠体11内に透光性樹脂を充填し、回路基板40の発光素子50を含む電子部品を封止する工程。
(5)インナーケース10の枠体11の上面のD部分に接着剤を塗布する工程。
(6)上ケース30をD部分に載置して接着し、枠体11と上ケース30の隙間(D部分の隙間)を密閉する工程。
(7)電子キーに熱を加え、注入した透光性樹脂を熱硬化する工程。
次に、本実施の形態の変形例1について図面を用いて説明する。
次に、本実施の形態の変形例2について図面を用いて説明する。
11 枠体
12、15 筒状部
13、14 リブ部
20 下ケース
21 位置決めピン
30、70 上ケース
40 回路基板
50 発光素子
60 透光性樹脂
121、131 筒体
122、132 突出部
123 載置面
124 注入口
125 切り欠き部
Claims (8)
- 筐体を構成する上ケースおよび下ケースと、
前記下ケースに載置された回路基板と、
前記回路基板を取り囲む中空状の枠体を有し、この枠体の上面と下面を前記上ケースと下ケースにそれぞれ接着して内部を密閉するインナーケースと、
前記回路基板の載置面と反対側の面に設けられ、少なくとも外部に発光する発光素子を有する電子部品と、
前記インナーケースの枠体内に注入されて前記電子部品を封止し、前記発光素子の照射光を外部に透過する透光性樹脂と、を備え、
前記インナーケースは、枠体内に前記発光素子を取り囲む筒状部を設け、前記筒状部外部に注入された前記透光性樹脂の高さより前記筒状部内部に注入された前記透光性樹脂の高さの方が高いことを特徴とする電子回路装置。 - 前記透光性樹脂の高さは前記筒状部の上端までの高さであることを特徴とする請求項1に記載の電子回路装置。
- 前記筒状部は、筒体とこの筒体の上面から突出する突出部とからなる凸状に形成され、前記筒体の上面に前記上ケースに設けた開口の周縁部が載置されることを特徴とする請求項2に記載の電子回路装置。
- 前記筒体には、前記インナーケースの内部空間と外部空間とを連結する切り欠き部が設けられたことを特徴とする請求項3に記載の電子回路装置。
- 前記インナーケースは、前記筒状部を補強するリブ部をさらに設けたことを特徴とする請求項1に記載の電子回路装置。
- 前記リブ部の上面の高さは、前記筒状部の筒体の高さよりも低いことを特徴とする請求項5に記載の電子回路装置。
- 前記リブ部の上面の高さは、前記筒状部の筒体の高さと等しいことを特徴とする請求項5に記載の電子回路装置。
- 筐体を構成する下ケースに回路基板を載置する工程と、
前記下ケースにインナーケースの枠体を載置して前記回路基板を取り囲み、前記回路基板の上面側に設けた発光素子を前記インナーケースに設けた筒状部で覆うとともに、前記枠体および筒状部の下面と前記下ケースの上面とを接着する工程と、
前記枠体の上面よりも高い位置に突出した筒状部の注入口から透光性樹脂を注入して前記発光素子を含む前記回路基板の電子回路を浸す工程と、
前記筐体を構成する上ケースを前記枠体の上面および筒状部の筒体上面に載置して前記枠体の上面と前記上ケースの下面とを接着する工程と、
前記透光性樹脂を熱硬化する工程と、
を備えたことを特徴とする電子回路装置の製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US14/759,334 US9568169B2 (en) | 2013-01-31 | 2013-12-13 | Electronic circuit device and method for manufacturing electronic circuit device |
JP2014559365A JP6253028B2 (ja) | 2013-01-31 | 2013-12-13 | 電子回路装置 |
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JP2013-016587 | 2013-01-31 | ||
JP2013016587 | 2013-01-31 |
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JPS5469063A (en) * | 1977-11-11 | 1979-06-02 | Omron Tateisi Electronics Co | Manufacture of electronic device |
JP2004153526A (ja) * | 2002-10-30 | 2004-05-27 | Denso Corp | 携帯機のケース |
JP2005179942A (ja) * | 2003-12-17 | 2005-07-07 | Denso Corp | 自動車用ワイヤレス送受信機 |
JP2012195371A (ja) * | 2011-03-15 | 2012-10-11 | Omron Corp | 光半導体パッケージおよび光半導体モジュールならびにこれらの製造方法 |
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KR100752586B1 (ko) * | 2004-06-28 | 2007-08-29 | 쿄세라 코포레이션 | 발광장치 및 조명장치 |
KR100580753B1 (ko) * | 2004-12-17 | 2006-05-15 | 엘지이노텍 주식회사 | 발광소자 패키지 |
KR100665262B1 (ko) * | 2005-10-20 | 2007-01-09 | 삼성전기주식회사 | 발광다이오드 패키지 |
US7808004B2 (en) * | 2006-03-17 | 2010-10-05 | Edison Opto Corporation | Light emitting diode package structure and method of manufacturing the same |
US7889421B2 (en) * | 2006-11-17 | 2011-02-15 | Rensselaer Polytechnic Institute | High-power white LEDs and manufacturing method thereof |
US8525213B2 (en) * | 2010-03-30 | 2013-09-03 | Lg Innotek Co., Ltd. | Light emitting device having multiple cavities and light unit having the same |
KR101901610B1 (ko) * | 2011-11-03 | 2018-09-28 | 엘지전자 주식회사 | 이동 단말기 |
JP5465288B2 (ja) * | 2012-08-08 | 2014-04-09 | Necトーキン株式会社 | 赤外線センサ |
-
2013
- 2013-12-13 WO PCT/JP2013/007348 patent/WO2014118856A1/ja active Application Filing
- 2013-12-13 JP JP2014559365A patent/JP6253028B2/ja not_active Expired - Fee Related
- 2013-12-13 US US14/759,334 patent/US9568169B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5469063A (en) * | 1977-11-11 | 1979-06-02 | Omron Tateisi Electronics Co | Manufacture of electronic device |
JP2004153526A (ja) * | 2002-10-30 | 2004-05-27 | Denso Corp | 携帯機のケース |
JP2005179942A (ja) * | 2003-12-17 | 2005-07-07 | Denso Corp | 自動車用ワイヤレス送受信機 |
JP2012195371A (ja) * | 2011-03-15 | 2012-10-11 | Omron Corp | 光半導体パッケージおよび光半導体モジュールならびにこれらの製造方法 |
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Publication number | Publication date |
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US20150338067A1 (en) | 2015-11-26 |
JP6253028B2 (ja) | 2017-12-27 |
JPWO2014118856A1 (ja) | 2017-01-26 |
US9568169B2 (en) | 2017-02-14 |
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