JPS62141712U - - Google Patents

Info

Publication number
JPS62141712U
JPS62141712U JP2913186U JP2913186U JPS62141712U JP S62141712 U JPS62141712 U JP S62141712U JP 2913186 U JP2913186 U JP 2913186U JP 2913186 U JP2913186 U JP 2913186U JP S62141712 U JPS62141712 U JP S62141712U
Authority
JP
Japan
Prior art keywords
resistor
light
circuit
distance
receiving element
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
JP2913186U
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 JP2913186U priority Critical patent/JPS62141712U/ja
Publication of JPS62141712U publication Critical patent/JPS62141712U/ja
Pending legal-status Critical Current

Links

Description

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

第１図は、本考案の一実施例に係る自動焦点カ
メラの要部回路図、第２図は、第１図における測
距回路の入出力特性を外光輝度ＩＤ対光信号検出
用抵抗端子間電圧Ｖ１で表わした図、第３図は、
従来の測距回路の回路図である。 Ｓ１，Ｓ２，Ｓ３：受光素子、Ｒ１（Ｒ１Ａ，
Ｒ１Ｂ），Ｒ２（Ｒ２Ａ，Ｒ２Ｂ）：光信号検出
用抵抗、Ｑ１〜Ｑ４：トランジスタ、Ａ１，Ａ２
：増幅器、Ｒｇ１〜ｇ４：帰還抵抗、Ｄ１，Ｄ２
：対数圧縮ダイオード、Ａ３：差動増幅器、ＣＰ
１〜ＣＰ６：コンパレータ、ＣＮＴ：コントロー
ラ。 FIG. 1 is a circuit diagram of the main parts of an autofocus camera according to an embodiment of the present invention, and FIG. 2 shows the input/output characteristics of the distance measuring circuit in FIG. Figure 3 shows the voltage V1 between
FIG. 2 is a circuit diagram of a conventional distance measuring circuit. S1, S2, S3: light receiving element, R1 (R 1 A,
R 1 B), R2 (R 2 A, R 2 B): Resistor for optical signal detection, Q1 to Q4: Transistor, A1, A2
: Amplifier, Rg1 to g4: Feedback resistor, D1, D2
: Logarithmic compression diode, A3: Differential amplifier, CP
1 to CP6: Comparator, CNT: Controller.

Claims (1)

【実用新案登録請求の範囲】 １ 測距時測距対象に向けて光を投射する発光素
子と、該測距対象からの反射光を受光する受光素
子と、該受光素子に直列に接続された第１の抵抗
と、該受光素子と第１の抵抗との直列回路に電圧
を印加する同直流電源と、該抵抗に生じる電圧を
検出する測距信号検出回路と、上記測距に先立つ
て上記受光素子の入射光量より外光の輝度を検出
し該検出値に応じて上記第１の抵抗の抵抗値を切
り換える回路とを具備することを特徴とする測距
装置。 ２ 前記抵抗値切換回路が、前記外光輝度検出値
に応じてオンまたはオフするスイツチング素子と
、該スイツチング素子を介して前記第１の抵抗と
直列もしくは並列に接続される第２の抵抗とを具
備する実用新案登録請求の範囲第１項記載の測距
装置。 ３ 前記抵抗値切換回路が、前記第１の抵抗の切
換えと連動して前記測距信号検出回路の利得を切
換える実用新案登録請求範囲第２項記載の測距装
置。[Claims for Utility Model Registration] 1. A light-emitting element that projects light toward a distance-measuring object during distance measurement, a light-receiving element that receives reflected light from the distance-measuring object, and a device connected in series to the light-receiving element. a first resistor, the same DC power supply that applies a voltage to a series circuit of the light receiving element and the first resistor, a ranging signal detection circuit that detects the voltage generated in the resistor, and a distance measuring signal detecting circuit that detects the voltage generated in the resistor; A distance measuring device comprising: a circuit that detects the brightness of external light from the amount of light incident on a light receiving element and switches the resistance value of the first resistor according to the detected value. 2. The resistance value switching circuit includes a switching element that is turned on or off according to the external light brightness detection value, and a second resistor that is connected in series or parallel to the first resistor via the switching element. A distance measuring device according to claim 1 of the utility model registration claim. 3. The ranging device according to claim 2, wherein the resistance value switching circuit switches the gain of the ranging signal detection circuit in conjunction with switching of the first resistor.
JP2913186U 1986-03-03 1986-03-03 Pending JPS62141712U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2913186U JPS62141712U (en) 1986-03-03 1986-03-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2913186U JPS62141712U (en) 1986-03-03 1986-03-03

Publications (1)

Publication Number Publication Date
JPS62141712U true JPS62141712U (en) 1987-09-07

Family

ID=30832740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2913186U Pending JPS62141712U (en) 1986-03-03 1986-03-03

Country Status (1)

Country Link
JP (1) JPS62141712U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11208230B2 (en) 2019-06-27 2021-12-28 Brother Kogyo Kabushiki Kaisha Printing apparatus including optical sensor located at conveying region through which label passes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5263749A (en) * 1975-11-20 1977-05-26 Yanagimoto Seisakusho Co Ltd Method and apparatus for signal processing in automatic air pollution measuring instruments
JPS56170709U (en) * 1980-05-22 1981-12-17
JPS59221607A (en) * 1983-05-31 1984-12-13 Copal Co Ltd Distance measuring device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5263749A (en) * 1975-11-20 1977-05-26 Yanagimoto Seisakusho Co Ltd Method and apparatus for signal processing in automatic air pollution measuring instruments
JPS56170709U (en) * 1980-05-22 1981-12-17
JPS59221607A (en) * 1983-05-31 1984-12-13 Copal Co Ltd Distance measuring device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11208230B2 (en) 2019-06-27 2021-12-28 Brother Kogyo Kabushiki Kaisha Printing apparatus including optical sensor located at conveying region through which label passes

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