JPS6329428B2 - - Google Patents

Info

Publication number
JPS6329428B2
JPS6329428B2 JP18641183A JP18641183A JPS6329428B2 JP S6329428 B2 JPS6329428 B2 JP S6329428B2 JP 18641183 A JP18641183 A JP 18641183A JP 18641183 A JP18641183 A JP 18641183A JP S6329428 B2 JPS6329428 B2 JP S6329428B2
Authority
JP
Japan
Prior art keywords
phototransistor
region
semiconductor device
optically coupled
base
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
JP18641183A
Other languages
Japanese (ja)
Other versions
JPS5994476A (en
Inventor
Toshibumi Yoshikawa
Hisao Nagao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP58186411A priority Critical patent/JPS5994476A/en
Publication of JPS5994476A publication Critical patent/JPS5994476A/en
Publication of JPS6329428B2 publication Critical patent/JPS6329428B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/12Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Light Receiving Elements (AREA)
  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Description

【発明の詳細な説明】 <技術分野> 本発明は発光ダイオードとホトトランジスタを
1つのパツケージに封入してなる光結合半導体装
置に関する。
DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an optically coupled semiconductor device comprising a light emitting diode and a phototransistor sealed in one package.

<従来技術> 光結合半導体装置において、発光ダイオードと
ホトトランジスタ間に急峻なパルス電圧が掛かる
と、ホトトランジスタが誤動作する現象はよく知
られている。これは、発光ダイオードとホトトラ
ンジスタ間の容量による静電カツプリングによる
ものである。
<Prior Art> It is well known that in an optically coupled semiconductor device, when a steep pulse voltage is applied between a light emitting diode and a phototransistor, the phototransistor malfunctions. This is due to electrostatic coupling due to the capacitance between the light emitting diode and the phototransistor.

第1図に従来のホトトランジスタ側の構造を、
第2図に光結合半導体装置の等価回路を示す。
Figure 1 shows the structure of the conventional phototransistor side.
FIG. 2 shows an equivalent circuit of the optically coupled semiconductor device.

発光ダイオードLEDとホトトランジスタPT間
の容量は、ホトトランジスタのN型コレクタ領域
1の表面積に比例する容量CGPCと、P+型ベース領
域2の表面積に比例する容量CGPBと、N+型エミ
ツタ領域3の表面積に比例する容量CGPEに分離で
きる。容量CGPC、CGPB、CGPEにおいて、最も重要
なものはベース領域2の表面積に比例する容量
CGPBである。なぜならば、容量CGPBに対応する静
電カツプリングがベース電流となり、hFE(一般に
hFEは10〜5000)倍に増幅されるためである。
The capacitance between the light emitting diode LED and the phototransistor PT is a capacitance C GPC proportional to the surface area of the N type collector region 1 of the phototransistor, a capacitance C GPB proportional to the surface area of the P + type base region 2, and an N + type emitter. It can be separated into a capacitance C GPE proportional to the surface area of region 3. The most important capacitance in C GPC , C GPB , and C GPE is the capacitance proportional to the surface area of base region 2.
C GPB . This is because the electrostatic coupling corresponding to the capacitance C GPB becomes the base current, and h FE (generally
This is because h FE is amplified 10 to 5000) times.

<発明の目的> 本発明はこのような容量CGPBを減少して、静電
カツプリングによる誤動作を防止した構造の光結
合半導体装置を提供するものである。
<Object of the Invention> The present invention provides an optically coupled semiconductor device having a structure in which such capacitance C GPB is reduced and malfunctions due to electrostatic coupling are prevented.

<実施例> 第3図に本発明光結合半導体装置のホトトラン
ジスタの構造例を示す。N型コレクタ領域1、
P+型ベース領域2、N+型エミツタ領域3の基本
的構造は、第1図のものと同じである。しかし、
ここではベース領域2の主たる部分を覆うように
該当部にエミツタ領域3を形成している。この結
果、ベース領域2の表面積に比例する容量CGPB
大幅に減少し、これに対応する静電カツプリング
による影響は大幅に低減される。
<Example> FIG. 3 shows an example of the structure of a phototransistor of the optically coupled semiconductor device of the present invention. N-type collector region 1,
The basic structures of the P + type base region 2 and the N + type emitter region 3 are the same as those in FIG. but,
Here, the emitter region 3 is formed in a corresponding portion so as to cover the main portion of the base region 2. As a result, the capacitance C GPB , which is proportional to the surface area of the base region 2, is significantly reduced and the corresponding effects due to electrostatic coupling are significantly reduced.

また図示のように、アルミニウム等の金属層4
を、コレクタ・ベース接合5とエミツタ・ベース
接合6上にそれぞれはみ出すよう形成し、エミツ
タ電極7等を介してエミツタ領域3に接続すると
更に効果的である。この場合、ベース電極8以外
のベース領域2の表面は、すべて実質的にエミツ
タ領域3及び上記金属層4でシールドされること
になる。又、必要ならば、ベース電極8も省略し
てよい。
In addition, as shown in the figure, a metal layer 4 such as aluminum
It is more effective if they are formed so as to protrude over the collector-base junction 5 and the emitter-base junction 6, respectively, and are connected to the emitter region 3 via the emitter electrode 7 or the like. In this case, the entire surface of the base region 2 other than the base electrode 8 is substantially shielded by the emitter region 3 and the metal layer 4. Furthermore, if necessary, the base electrode 8 may also be omitted.

なお、エミツタ領域3は薄く、コレクタ・ベー
ス接合5における光電流生成にはほとんど影響の
ないようにできる。もちろん、エミツタ電極7も
充分小さく、ベース領域3での受光作用に支障は
ない。また、本発明は、NPNP構造を有するホ
トサイリスタ、ホトトライアツクにも適用でき
る。
Note that the emitter region 3 is thin and can be made to have almost no effect on photocurrent generation at the collector-base junction 5. Of course, the emitter electrode 7 is also sufficiently small and does not interfere with the light receiving function in the base region 3. Furthermore, the present invention can also be applied to photothyristors and phototriaxes having an NPNP structure.

<発明の効果> 以上のように本発明によれば、受光部側のホト
トランジスタの電池増幅率hFEより、入出力間の
電流伝達比が大きくとれる光結合半導体装置にあ
つて、構成簡単なシールド構造により、電流増幅
率hFEに従つて顕著に表われる、光結合半導体装
置における静電カツプリングの影響を除去でき、
急峻なパルス電圧印加による誤動作をなくして有
用な光結合半導体装置が提供できる。
<Effects of the Invention> As described above, according to the present invention, an optically coupled semiconductor device in which the current transfer ratio between input and output can be made larger than the cell amplification factor h FE of the phototransistor on the light-receiving part side can be realized with a simple configuration. The shield structure can eliminate the effects of electrostatic coupling in the optically coupled semiconductor device, which becomes noticeable as the current amplification factor h FE increases.
A useful optically coupled semiconductor device can be provided by eliminating malfunctions caused by application of steep pulse voltages.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来のホトトランジスタ側構造を示す
断面図、第2図は光結合半導体装置の静電カツプ
リングを説明する等価回路、第3図は本発明の一
実施例におけるホトトランジスタ側構造を有す断
面図である。 1……コレクタ領域、2……ベース領域、3…
…エミツタ領域、LED……発光ダイオード、PT
……ホトトランジスタ。
FIG. 1 is a sectional view showing a conventional phototransistor side structure, FIG. 2 is an equivalent circuit explaining electrostatic coupling of an optically coupled semiconductor device, and FIG. 3 is a phototransistor side structure in an embodiment of the present invention. FIG. 1... Collector area, 2... Base area, 3...
...Emitter area, LED...Light emitting diode, PT
...Phototransistor.

Claims (1)

【特許請求の範囲】[Claims] 1 発光ダイオードとホトトランジスタを1つの
パツケージに封入してなる光結合半導体装置にお
いて、ホトトランジスタのベース領域の主たる部
分にエミツタ領域を形成するとともに、露出する
ベース領域に絶縁物を介して金属層を形成し、ベ
ース電極以外のベース領域の表面を、前記エミツ
タ領域及び前記金属層によりシールドしてなるこ
とを特徴とする光結合半導体装置。
1. In an optically coupled semiconductor device in which a light emitting diode and a phototransistor are sealed in one package, an emitter region is formed in the main part of the base region of the phototransistor, and a metal layer is formed on the exposed base region via an insulator. an optically coupled semiconductor device, wherein the surface of the base region other than the base electrode is shielded by the emitter region and the metal layer.
JP58186411A 1983-10-03 1983-10-03 Photocoupler Granted JPS5994476A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58186411A JPS5994476A (en) 1983-10-03 1983-10-03 Photocoupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58186411A JPS5994476A (en) 1983-10-03 1983-10-03 Photocoupler

Publications (2)

Publication Number Publication Date
JPS5994476A JPS5994476A (en) 1984-05-31
JPS6329428B2 true JPS6329428B2 (en) 1988-06-14

Family

ID=16187944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58186411A Granted JPS5994476A (en) 1983-10-03 1983-10-03 Photocoupler

Country Status (1)

Country Link
JP (1) JPS5994476A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6195581A (en) * 1984-10-16 1986-05-14 Toshiba Corp Photocoupler
JPH0575159A (en) * 1991-09-18 1993-03-26 Nec Corp Optical semiconductor device
DE59405248D1 (en) * 1993-09-23 1998-03-19 Siemens Ag Optocoupler and method for its production

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4871583A (en) * 1971-12-27 1973-09-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4871583A (en) * 1971-12-27 1973-09-27

Also Published As

Publication number Publication date
JPS5994476A (en) 1984-05-31

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