JPH02105180U - - Google Patents

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Publication number
JPH02105180U
JPH02105180U JP1316989U JP1316989U JPH02105180U JP H02105180 U JPH02105180 U JP H02105180U JP 1316989 U JP1316989 U JP 1316989U JP 1316989 U JP1316989 U JP 1316989U JP H02105180 U JPH02105180 U JP H02105180U
Authority
JP
Japan
Prior art keywords
light
signal
frequency
pll
outputs
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
Application number
JP1316989U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP1316989U priority Critical patent/JPH02105180U/ja
Publication of JPH02105180U publication Critical patent/JPH02105180U/ja
Pending legal-status Critical Current

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  • Optical Communication System (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

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

第１図は本考案の実施例構成図；第２図は第１
図の動作を示した信号波形図である。 １０：投光器、１２：受光器、１４：パルス発
生器、１６：キヤリアパルス発振器、１８：ゲー
ト回路、２０：発光部、２２：受光部、２４：狭
帯域増幅器、２６：ＰＬＬトーンデコーダ、２８
：信号処理回路。 Figure 1 is a configuration diagram of an embodiment of the present invention; Figure 2 is a diagram of the first embodiment of the present invention;
FIG. 3 is a signal waveform diagram showing the operation shown in FIG. 10: Emitter, 12: Light receiver, 14: Pulse generator, 16: Carrier pulse oscillator, 18: Gate circuit, 20: Light emitting section, 22: Light receiving section, 24: Narrowband amplifier, 26: PLL tone decoder, 28
: Signal processing circuit.

Claims (1)

【実用新案登録請求の範囲】 投光器と受光器を対向状態で分離配置し、高周
波と低周波により２重に振幅変調された前記投光
器からの赤外線変調光を前記受光器で受光する光
遮断式検出器に於いて、 前記受光器に、 前記投光器からの赤外線変調光を受光して電気
信号に変換する受光部と； 該受光部の受光信号からの前記変調高周波の周
波数を中心とした狭帯域の周波数成分のみを抽出
して増幅する狭帯域増幅器と； 該狭帯域増幅器で抽出増幅された高周波信号の
周波数及び位相に、ループ内の発振周波数及び位
相を追従させるＰＬＬループを備え、該ＰＬＬル
ープのロツク状態を検出して判別信号を出力する
ＰＬＬトーンデコーダと； 該ＰＬＬトーンデコーダの判別出力が所定時間
以上断たれた時に異常検出信号を出力する信号処
理回路と； を備えたことを特徴とする光遮断式検出器。[Claims for Utility Model Registration] A light-interrupting detection method in which a light emitter and a light receiver are arranged separately and facing each other, and the receiver receives infrared modulated light from the light emitter that is doubly amplitude-modulated by high and low frequencies. In the device, the light receiver includes a light receiving section that receives the infrared modulated light from the light projector and converts it into an electrical signal; a narrowband amplifier that extracts and amplifies only frequency components; a PLL loop that makes the oscillation frequency and phase within the loop follow the frequency and phase of the high frequency signal extracted and amplified by the narrowband amplifier; A PLL tone decoder that detects a lock state and outputs a discrimination signal; and a signal processing circuit that outputs an abnormality detection signal when the discrimination output of the PLL tone decoder is cut off for a predetermined time or more. Light-blocking detector.
JP1316989U 1989-02-07 1989-02-07 Pending JPH02105180U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1316989U JPH02105180U (en) 1989-02-07 1989-02-07

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1316989U JPH02105180U (en) 1989-02-07 1989-02-07

Publications (1)

Publication Number Publication Date
JPH02105180U true JPH02105180U (en) 1990-08-21

Family

ID=31223263

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1316989U Pending JPH02105180U (en) 1989-02-07 1989-02-07

Country Status (1)

Country Link
JP (1) JPH02105180U (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921132A (en) * 1982-07-27 1984-02-03 Matsushita Electric Ind Co Ltd Interphone device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921132A (en) * 1982-07-27 1984-02-03 Matsushita Electric Ind Co Ltd Interphone device

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