JPS6282758U

JPS6282758U -

Info

Publication number: JPS6282758U
Application number: JP6916285U
Authority: JP
Priority date: 1985-05-10
Filing date: 1985-05-10
Publication date: 1987-05-27

Description

[Brief explanation of the drawing]

第１図は本考案の実施例に係る半導体レーザ警
報装置中の基準レベル発生回路の回路図、第２図
は従来の半導体レーザ警報装置の構成図、第３図
、第４図および第５図は第２図の動作説明図、第
６図、第７図および第８図は第１図の動作説明図
である。１……自動電力制御回路（ＡＰＣ回路）、２…
…ＬＤ駆動回路、３……駆動電流検出回路、４…
…基準レベル発生回路、５……比較回路、１０…
…第１の入力回路、１４……感温素子、２０……
第２の入力回路、２１……可変抵抗、３０……演
算増幅器、３１Ａ……第１の入力端子、３１Ｂ…
…第２の入力端子、３１Ｃ……出力端子、Ｖ１…
…検出倍号、Ｖ２……基準レベル倍号、Ｖ３……
警報倍号。 FIG. 1 is a circuit diagram of a reference level generation circuit in a semiconductor laser alarm device according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional semiconductor laser alarm device, and FIGS. 3, 4, and 5 is an explanatory diagram of the operation in FIG. 2, and FIGS. 6, 7, and 8 are explanatory diagrams of the operation in FIG. 1... automatic power control circuit (APC circuit), 2...
...LD drive circuit, 3... Drive current detection circuit, 4...
...Reference level generation circuit, 5...Comparison circuit, 10...
...First input circuit, 14... Temperature sensing element, 20...
Second input circuit, 21... variable resistor, 30... operational amplifier, 31A... first input terminal, 31B...
...Second input terminal, 31C...Output terminal, V1...
...Detection multiple, V2...Reference level multiple, V3...
Warning double.

補正昭６１．１２．２５図面の簡単な説明を次のように補正する。明細書、第１４頁６行目の「および第８図」を
、「、第８図および第９図」と補正する。Amendment December 25, 1981 The brief description of the drawing is amended as follows. In the specification, page 14, line 6, "and FIG. 8" is amended to read ", FIG. 8 and FIG. 9."

Claims

[Claims for Utility Model Registration] A drive current detection circuit that detects a drive current supplied to a semiconductor laser and outputs a detection signal thereof; a reference level generation circuit that outputs a reference level signal according to temperature change; A semiconductor laser alarm device comprising: a comparison circuit that compares a detection signal with the reference level signal and outputs an alarm signal when the detection signal exceeds the reference level signal; an operational amplifier having a first input terminal supplied with an input voltage, a second input terminal supplied with an input voltage, and an output terminal that outputs a reference level signal according to a difference between the reference voltage and the input voltage; It is characterized by comprising a first input circuit connected to a terminal and whose resistance value changes according to temperature changes, and a second input circuit whose resistance value is variable and connected in parallel with the first input circuit. Semiconductor laser warning device.