JPH0448737U - - Google Patents

Description

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

第１図乃至第４図は本発明の第１の実施例を示
し、第１図は受光回路の電気的構成図、第２図は
全体構成のブロツク図、第３図ａ，ｂは受光回路
の切換動作時における等価回路図、第４図はＭＯ
ＳＦＥＴの特性を示す作用説明図であり、第５図
ａは第１図相当図、第５図ｂは変形例を示す同図
ａ相当図、第６図ａ乃至ｃ′は種々の変形例を示
す第５図相当図である。 図面中、１は受光回路、３はマイクロコンピユ
ータ、６は投光回路、７は内蔵電池（電源）、８
は電源回路、９はフオトダイオード、１０はトラ
ンジスタ（切換手段）、１４はＭＯＳＦＥＴ（切
換手段）、１５はコンデンサである。 1 to 4 show a first embodiment of the present invention, FIG. 1 is an electrical configuration diagram of a light receiving circuit, FIG. 2 is a block diagram of the overall configuration, and FIGS. 3 a and 3 are a light receiving circuit. The equivalent circuit diagram during the switching operation of MO
FIG. 5A is a diagram corresponding to FIG. 1, FIG. 5B is a diagram corresponding to FIG. 5 is a diagram corresponding to FIG. 5. In the drawing, 1 is a light receiving circuit, 3 is a microcomputer, 6 is a light emitter circuit, 7 is a built-in battery (power supply), 8
9 is a power supply circuit, 9 is a photodiode, 10 is a transistor (switching means), 14 is a MOSFET (switching means), and 15 is a capacitor.

補正 平２．１１．２９ 図面の簡単な説明を次のように補正する。 明細書第１４頁第１５行に記載の「ｃ′」を「
ｆ」と訂正する。Amendment November 29, 1992 The brief description of the drawing is amended as follows. "c'" written on page 14, line 15 of the specification is replaced with "
f” and correct it.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 光信号を受けるフオトダイオードと、このフオ
トダイオードにバイアスを与えるための電源と、
前記フオトダイオードをバイアスを与えた状態で
受光信号を取出す交信モード及び無バイアス状態
で光信号による起電力のみで受光信号を取出す待
機モードの切換えを行なうための切換手段とを具
備し、前記切換手段は、常には前記フオトダイオ
ードに対して前記待機モードに設定し受光信号が
検出されるとこれに基づいて交信モードに切換え
て受信することを特徴とする光通信用受信回路。 a photodiode that receives an optical signal; a power source for biasing the photodiode;
a switching means for switching between a communication mode in which the photodiode is outputted with a bias applied thereto and a standby mode in which the photoreception signal is outputted only by the electromotive force generated by the optical signal in an unbiased state; The receiving circuit for optical communication is characterized in that the photodiode is always set in the standby mode, and when a light reception signal is detected, it is switched to the communication mode based on this and reception is performed.