JPH04123326A - Optical head device - Google Patents
Optical head deviceInfo
- Publication number
- JPH04123326A JPH04123326A JP2244515A JP24451590A JPH04123326A JP H04123326 A JPH04123326 A JP H04123326A JP 2244515 A JP2244515 A JP 2244515A JP 24451590 A JP24451590 A JP 24451590A JP H04123326 A JPH04123326 A JP H04123326A
- Authority
- JP
- Japan
- Prior art keywords
- optical head
- head device
- fuse
- short
- semiconductor laser
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 239000004065 semiconductor Substances 0.000 claims abstract description 9
- 230000006378 damage Effects 0.000 abstract description 17
- 230000005611 electricity Effects 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 241000277269 Oncorhynchus masou Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06825—Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation
Landscapes
- Optical Head (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野１
この発明は、光学式ヘッド装置の半導体レーザ保護装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a semiconductor laser protection device for an optical head device.
［従来の技術１
光学式ヘッド装置に搭載される半導体レーザ（以後ＬＤ
と称す）は、光学式ヘッド装置の輸送時や、駆動装置へ
の取り付は時などに、人体などから発生する静電気によ
って静電破壊を招き、このために光学式ヘッド装置が使
用不能になるという問題があった。この問題を解消する
ために、従来は以下のような構成でＬＤの静電破壊を防
止していた。[Conventional technology 1 A semiconductor laser (hereinafter referred to as LD) mounted on an optical head device
When transporting an optical head device or installing it in a drive device, static electricity generated from the human body can cause electrostatic damage, which can make the optical head device unusable. There was a problem. In order to solve this problem, the following configuration has conventionally been used to prevent electrostatic damage to the LD.
例えば実開平１−１７１０５６号公報では半導体レーザ
駆動用プリント基体に切断可能な突出部を設け、これに
ショートパターンをめぐらせて半導体レーザなショート
させておき、静電破壊が生じないようにしている。その
後、静電破壊の危険性が無くなった時点で前記突出部を
切り取り、ショートを無くし、正常に作動しつるように
していた。しかし、これでは、前記突出部の切り取り作
業、あるいは切り取った突出部の廃棄処理に手間がかか
るのである。For example, in Japanese Utility Model Application Publication No. 1-171056, a cuttable protrusion is provided on a printed substrate for driving a semiconductor laser, and a short pattern is wrapped around this to short the semiconductor laser to prevent electrostatic damage. . Thereafter, when there was no longer any risk of electrostatic damage, the protrusion was cut off to eliminate short circuits and ensure normal operation and hanging. However, this requires time and effort to cut out the protrusion or dispose of the cut protrusion.
更に別の従来の光学式ヘッド装置の保護態様を説明する
ためにその概略斜視図と概略構成図を第７図および第８
図に示す。これら図において（１）はＬＤ、（２）はＬ
Ｄ（１）が搭載される光学式ヘッド装置、（３）は光学
式ヘッド装置（２）とその駆動装置の回路基板（４）と
の接続をするための入出力用電線、（５）はＬＤ静電破
壊防止用のＬＤ短絡用コネクタである。In order to explain the protection aspect of another conventional optical head device, a schematic perspective view and a schematic configuration diagram thereof are shown in FIGS. 7 and 8.
As shown in the figure. In these figures, (1) is LD, (2) is L
D (1) is an optical head device mounted, (3) is an input/output electric wire for connecting the optical head device (2) and the circuit board (4) of its drive device, and (5) is an This is an LD short-circuit connector to prevent LD electrostatic damage.
次に、この従来例の作用について説明する。第７図及び
第８図において、ＬＤ （１）は光学式ヘッド装置（２
）に搭載され、通常ＬＤ （１）の両端即ち、アノード
、カソードが入出力用電線（３）に接続されている。こ
の時、入出力用電線（３）のＬＤ （１）に接続されて
いる電線の両端（ｃｄ）が開放された状態になっている
と、その両端から静電気などが入り込み、ＬＤ （１）
が静電破壊されてしまうため、従来は、入出力用電線（
３）をＬＤ短絡用コネクタ（５）に接続し、このＬＤ短
絡用コネクタの短絡線（５′）によって短絡することに
よってＬＤ （１）への静電気の流入を防ぎ、静電破壊
を防止していた。Next, the operation of this conventional example will be explained. 7 and 8, the LD (1) is an optical head device (2).
), and usually both ends of the LD (1), that is, the anode and cathode, are connected to the input/output wire (3). At this time, if both ends (cd) of the input/output wire (3) connected to LD (1) are open, static electricity etc. will enter from both ends and the LD (1)
Conventionally, input/output wires (
3) to the LD short-circuiting connector (5) and short-circuiting with the shorting wire (5') of this LD short-circuiting connector prevents static electricity from flowing into the LD (1) and prevents electrostatic damage. Ta.
〔発明が解決しようとする課題〕
従来の光学式ヘッド装置（２）は以上のように構成され
ていたので、光学式ヘッド装置（２）を駆動装置の回路
基板（４）などに接続する際に、少なくとも一度は、Ｌ
Ｄ短絡用コネクタ（５）をはずし、ＬＤ （１）の両端
（ｃ、ｄ）が開放されることになりＬＤの静電破壊が起
こる可能性があるため、静電破壊を防止するためのアー
スバンドなどを作業者に装着しなければならず、組立作
業がしにくいなどの問題点があった。[Problems to be Solved by the Invention] Since the conventional optical head device (2) is configured as described above, when connecting the optical head device (2) to the circuit board (4) of the drive device, etc. At least once in L
When the D short connector (5) is removed, both ends (c, d) of the LD (1) will be opened, which may cause electrostatic damage to the LD. Therefore, connect the ground to prevent electrostatic damage. There were problems such as the need for the worker to wear a band or the like, which made assembly work difficult.
この発明は、上記のような問題点を解消するためになさ
れたもので、光学式ヘッド装置（２）の入出力用電線（
３）にＬＤ短絡用コネクタ（５）を装着することな（Ｌ
Ｄ （１）を静電破壊から保護する装置を得るとともに
、ＬＤの保護の解除を簡単にできる装置を持つ光学式ヘ
ッド装置を得ることを目的とする。This invention was made in order to solve the above-mentioned problems, and the input/output electric wire (
3) Do not attach the LD short-circuit connector (5) to the (L
An object of the present invention is to obtain an optical head device having a device that protects the LD (1) from electrostatic damage and also allows easy release of the protection of the LD.
［課題を解決するための手段］
この発明に係る光学式ヘッド装置は、ＬＤの静電破壊を
防止するＬＤ短絡保護手段にヒユーズを用いるようにし
たものである。[Means for Solving the Problems] The optical head device according to the present invention uses a fuse as an LD short-circuit protection means for preventing electrostatic damage to the LD.
［作用］
この発明における光学式ヘッド装置は、光学式ヘッド装
置の輸送時、及び接続時などのＬＤの保護時にはＬＤは
短絡されたままで、ＬＤの駆動時に供給された電流によ
ってヒユーズが溶断されＬＤ保護の解除が行われる。[Function] In the optical head device of the present invention, when the optical head device is transported and when the LD is protected such as when connected, the LD remains short-circuited, and the fuse is blown by the current supplied when driving the LD. Protection is removed.
以下、この発明の一実施例を第１図、第２図および第３
図について説明する。これら図において（１）はＬＤ、
（２）は光学式ヘッド装置、（３）は入出力用電線、（
６）はＬＤ （１）を短絡するヒユーズ、（７）はヒユ
ーズ（６）を光学式ヘッド装置（２）上に固定する基板
、（８）はヒユーズ（６）とＬＤ（１）のそれぞれ両端
を接続する電線、（１ｏ）はＬＤ （１）を駆動す！Ｌ
ＤＬＤ駆動回路る。An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.
The diagram will be explained. In these figures, (1) is LD,
(2) is an optical head device, (3) is an input/output electric wire, (
6) is a fuse that short-circuits LD (1), (7) is a board that fixes fuse (6) on optical head device (2), and (8) is each end of fuse (6) and LD (1). The electric wire connecting the (1o) drives the LD (1)! L
DLD drive circuit.
次に、動作について説明する。第１図において、光学式
ヘッド装置（２）上のＬＤ （１）は、同じく光学式ヘ
ッド装置（２）上のヒユーズ（６）に、それぞれ両端を
電線（８）によって接続されているために、ＬＤ （１
）は短絡され輸送時や、駆動装置の回路基板（４）への
接続時などで発生する静電気によるＬＤ （１）の静電
破壊は防止される。そして、光学式ヘッド装置（２）が
回路基板（４）に接続された後には、以下のようにして
ＬＤ （１）を保護しているヒユーズ（６）を自動的に
遮断する。Next, the operation will be explained. In FIG. 1, the LD (1) on the optical head device (2) is connected to the fuse (6) on the optical head device (2) at both ends by electric wires (8). , LD (1
) are short-circuited to prevent electrostatic damage to the LD (1) due to static electricity generated during transportation or connection to the circuit board (4) of the drive device. After the optical head device (2) is connected to the circuit board (4), the fuse (6) protecting the LD (1) is automatically cut off as follows.
ＬＤ （１）は一般的に第４図のような電流−光出力特
性をもっている。ここで、ＬＤ （１）が発光し始める
電流値をＩｔｈ、ヒユーズ（６）の遮断電流値をＩ
ｃｕｔ、 ＬＤ （１）をＬＤ駆動回路（１０）が駆動
する駆動電流をＩ ＬＤとすると、第３図（ロ）のよ
うにＩ ＬＤ ＜Ｉ ｃｕｔの時はＩ ＬＤがヒ
ユーズ（６）側に殆ど流れ、ＬＤ （１）にはごくわず
かしか流れない。次に、第３図（ハ）のようにＩ ｃ
ｕｔ≦Ｉ ＬＤ≦ｒ ｔｈの時に電流Ｉ ＬＤに
よってヒユーズ（６）が遮断されＬＤ （１）に電流Ｉ
ＬＤが供給される。しかし、この時のＩ ＬＤは
まだＩ ｔｈに達していないためＬＤ （１）は発光
しない。そして、第３図（ニ）のようにＩ ｔｈ≦Ｔ
ＬＤの時に初めてＬＤ （１）が発光な始める。LD (1) generally has current-light output characteristics as shown in FIG. Here, the current value at which the LD (1) starts to emit light is Ith, and the breaking current value of the fuse (6) is I.
cut, LD If the drive current driven by the LD drive circuit (10) for (1) is ILD, when ILD<Icut, ILD is on the fuse (6) side as shown in Figure 3 (b). Most of the current flows, and only a small amount flows into LD (1). Next, as shown in FIG. 3(c), I c
When ut≦I LD≦r th, the fuse (6) is cut off by LD, and the current I flows through LD (1).
LD is supplied. However, since I LD at this time has not yet reached I th , LD (1) does not emit light. Then, as shown in Figure 3 (d), I th≦T
LD (1) starts emitting light for the first time when the LD is turned on.
次に第２の実施例を第５図について説明する。Next, a second embodiment will be described with reference to FIG.
上記第１の実施例では、ＬＤ （１）を短絡するために
ヒユーズ（６）を基板（７）と電線（８）によって取り
付けたが、ＬＤ （１）に接続される入出力用電線（３
）のどこに付けてもよく、第５図に示すように例えば入
出力用電線（３）がＦＰＣ（フレキシブル プリント
サーキット）などの場合には、その線路の間のどこに取
り付けてもよいことは言うまでもない。In the first embodiment, the fuse (6) was attached to the board (7) and the electric wire (8) in order to short-circuit the LD (1), but the input/output electric wire (3) connected to the LD (1) was
), and as shown in Figure 5, for example, input/output wires (3) can be attached to FPC (flexible printed
Needless to say, in cases such as circuits, it can be installed anywhere between the tracks.
次に第３の実施例を第６図について説明する。Next, a third embodiment will be described with reference to FIG.
上記第１．第２の実施例においてＬＤ （１）の両端に
ヒユーズ（６）を直接取り付けたが、第６図に示すよう
にスイッチ（９）と、ヒユーズ（６）を直列に接続した
ものを取り付けてもよく、この場合光学式ヘッド装置（
２）の組立時にはスイッチ（９）をオンしておくことに
よってＬＤ （１）を短絡してＬＤ （１）を静電破壊
から保護し、スイッチ（９）をオフすることによってＬ
Ｄ （１）の短絡を解除して、光学式ヘッド装置（２）
の調整時などにはＬＤ（１）を発光させることが出来る
ようになる。そして、光学式ヘッド装置（２）の調整・
試験完了後、再度スイッチ（９）をオンにすれば上記第
１の実施例と同様の効果を得ることが出来る。Above 1st. In the second embodiment, the fuses (6) were directly attached to both ends of the LD (1), but it is also possible to attach a switch (9) and a fuse (6) connected in series as shown in Fig. 6. Well, in this case an optical head device (
When assembling 2), turn on the switch (9) to short-circuit the LD (1) and protect it from electrostatic damage, and turn off the switch (9) to protect the LD (1) from electrostatic damage.
D Release the short circuit in (1) and remove the optical head device (2).
When adjusting, for example, the LD (1) can be made to emit light. Then, adjust the optical head device (2).
After the test is completed, by turning on the switch (9) again, the same effect as in the first embodiment can be obtained.
［発明の効果］
以上のように、この発明によればＬＤを短絡するために
、ＬＤの発光しきい値電流以下のヒユーズを用いること
により、光学式ヘッド装置が駆動装置に接続される際の
ＬＤの静電破壊を防止できさらに光学式ヘッド装置を使
用する際には、ＬＤを駆動するための電流を用いてヒユ
ーズを溶かすことで、自然に保護手段を解除できる。[Effects of the Invention] As described above, according to the present invention, in order to short-circuit the LD, a fuse having a current lower than the emission threshold current of the LD is used, thereby reducing the time when the optical head device is connected to the drive device. Electrostatic damage to the LD can be prevented, and when an optical head device is used, the protection means can be naturally released by melting the fuse using the current for driving the LD.
また、必要に応じて、保護の状態を解除し、ＬＤを動作
させることができる。Further, if necessary, the protection state can be canceled and the LD can be operated.
第１図および第２図はこの発明の一実施例による光学式
ヘッド装置の概略斜視図および概略構成図、第３図はヒ
ユーズと電流の関係を示す図、第４図はＬＤの電流−光
出力特性図、第５図は本発明の第２の実施例を示す図、
第６図は本発明の第３の実施例を示す図、第７図および
第８図は従来の光学式ヘッド装置の概略斜視図および概
略構成図である。
図において、（１）はＬＤ、（２）は光学式ヘッド装置
、（５）はＬＤ短絡用コネクタ、（６）はヒユーズ、（
９）はスイッチである。
尚、図中、同一符号は同一 または相当部分を示す。
代理人 弁理士 大 岩 増 雄第
図
電
１に
第
図
第
図
０２０て一＝
第
図
コ
９：スイソケ
第
図
ＬＤが４番用コネクタ1 and 2 are a schematic perspective view and a schematic configuration diagram of an optical head device according to an embodiment of the present invention, FIG. 3 is a diagram showing the relationship between fuses and current, and FIG. 4 is a diagram showing the relationship between LD current and light. Output characteristic diagram, FIG. 5 is a diagram showing the second embodiment of the present invention,
FIG. 6 shows a third embodiment of the present invention, and FIGS. 7 and 8 are a schematic perspective view and a schematic configuration diagram of a conventional optical head device. In the figure, (1) is the LD, (2) is the optical head device, (5) is the LD shorting connector, (6) is the fuse, (
9) is a switch. In the figures, the same reference numerals indicate the same or equivalent parts. Agent Patent Attorney Masu Oiwa No. 1 to No. 020 = No. 9: Suisoke No. 4 LD connector
Claims (2)
ーザ光を用いて光学式情報記録媒体に記録・再生を行う
光学式ヘッド装置に於て、 上記半導体レーザの両端はヒューズで短絡され、上記半
導体レーザの駆動電流により上記ヒューズが溶断される
ことを特徴とする光学式ヘッド装置。(1) In an optical head device that uses a semiconductor laser and a laser beam emitted from the semiconductor laser to perform recording and reproduction on an optical information recording medium, both ends of the semiconductor laser are short-circuited with a fuse, and the semiconductor laser is short-circuited with a fuse. An optical head device characterized in that the fuse is blown by a laser drive current.
する請求項第１項記載の光学式ヘッド装置。(2) The optical head device according to claim 1, further comprising a switch provided in series with the fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2244515A JPH04123326A (en) | 1990-09-14 | 1990-09-14 | Optical head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2244515A JPH04123326A (en) | 1990-09-14 | 1990-09-14 | Optical head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04123326A true JPH04123326A (en) | 1992-04-23 |
Family
ID=17119828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2244515A Pending JPH04123326A (en) | 1990-09-14 | 1990-09-14 | Optical head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04123326A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6317443B1 (en) * | 1996-07-09 | 2001-11-13 | Jds Uniphase Corporation | High power, reliable optical fiber pumping system with high redundancy for use in lightwave communication systems |
| JP2006278662A (en) * | 2005-03-29 | 2006-10-12 | Nec Corp | Optical source for optical communication |
| WO2011038708A1 (en) * | 2009-09-30 | 2011-04-07 | Osram Opto Semiconductors Gmbh | Optoelectronic semiconductor chip and method for adapting a contact structure for electrically contacting an optoelectronic semiconductor chip |
-
1990
- 1990-09-14 JP JP2244515A patent/JPH04123326A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6317443B1 (en) * | 1996-07-09 | 2001-11-13 | Jds Uniphase Corporation | High power, reliable optical fiber pumping system with high redundancy for use in lightwave communication systems |
| JP2006278662A (en) * | 2005-03-29 | 2006-10-12 | Nec Corp | Optical source for optical communication |
| WO2011038708A1 (en) * | 2009-09-30 | 2011-04-07 | Osram Opto Semiconductors Gmbh | Optoelectronic semiconductor chip and method for adapting a contact structure for electrically contacting an optoelectronic semiconductor chip |
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