JPH0159231U - - Google Patents

Info

Publication number
JPH0159231U
JPH0159231U JP15578087U JP15578087U JPH0159231U JP H0159231 U JPH0159231 U JP H0159231U JP 15578087 U JP15578087 U JP 15578087U JP 15578087 U JP15578087 U JP 15578087U JP H0159231 U JPH0159231 U JP H0159231U
Authority
JP
Japan
Prior art keywords
movable member
light
optical path
state before
pulse
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
JP15578087U
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 JP15578087U priority Critical patent/JPH0159231U/ja
Publication of JPH0159231U publication Critical patent/JPH0159231U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Shutters For Cameras (AREA)

Description

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

第１図は本考案の１実施例にかかる絞り羽根兼
用のシヤツタ羽根を使用したプログラムシヤツタ
の機構を示す平面図、第２図は本考案の１実施例
を示す回路図、第３図は第２図に示す回路の動作
を示すタイムチヤート、第４図は第１図の変形例
を示す平面図、第５図は従来の位置検出装置を絞
り羽根兼用のシヤツタ羽根を使用したプログラム
シヤツタに適用した機構例を示す平面図、第６図
は従来の位置検出装置の回路図、第７図は第６図
に示す位置検出装置における受光レベルの変化と
検出用パルスの変化の関係を示す特性図。 １……シヤツタ羽根、Ｓ０〜Ｓ８……スリツト
、２……フオトインタラプタ、２ａ……発光ダイ
オード、２ｂ……フオトトランジスタ、４……コ
ンパレータ、１０……フリツプフロツプ、１４…
…カウンタ、１５……電流切り換え回路、１６…
…遅延回路、１７……エクスクルースイブオアゲ
ート。 Fig. 1 is a plan view showing the mechanism of a program shutter using shutter blades that also serve as aperture blades according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing an embodiment of the present invention, and Fig. 3 is a Fig. 2 is a time chart showing the operation of the circuit shown in Fig. 4, a plan view showing a modification of Fig. 1, and Fig. 5 is a program shutter in which the conventional position detection device uses a shutter blade that also serves as an aperture blade. Fig. 6 is a circuit diagram of a conventional position detection device, and Fig. 7 shows the relationship between changes in the received light level and changes in the detection pulse in the position detection device shown in Fig. 6. Characteristic diagram. 1...Shutter blade, S0 to S8 ...Slit, 2...Photo interrupter, 2a...Light emitting diode, 2b...Phototransistor, 4...Comparator, 10...Flip-flop, 14...
...Counter, 15...Current switching circuit, 16...
...delay circuit, 17...exclusive eve or gate.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 可動部材に連設されたスリツトにより投光部か
ら受光部に至る光路を開閉して前記受光部に得ら
れる信号レベルを基準レベルと比較して得られる
パルスにより前記可動部材の位置検出を行う様に
した位置検出装置において、前記パルスのアツプ
エツジ及びダウンエツジを検出する手段を設ける
とともに、前記可動部材の作動前の状態において
前記投光部から前記受光部に至る光路が開放され
る様になし、前記可動部材の作動前の状態におけ
る前記受光部から得られる信号レベルが一定のレ
ベルとなる様に前記投光部の駆動電流を制御する
様にしたことを特徴とする位置検出装置。 The position of the movable member is detected by the pulse obtained by opening and closing the optical path from the light emitter to the light receiver using a slit connected to the movable member and comparing the signal level obtained at the light receiver with a reference level. In the position detecting device according to the present invention, a means for detecting an up edge and a down edge of the pulse is provided, and the optical path from the light projecting section to the light receiving section is opened in a state before the movable member is actuated. A position detection device characterized in that a driving current of the light projecting section is controlled so that a signal level obtained from the light receiving section in a state before the movable member is activated is a constant level.
JP15578087U 1987-10-12 1987-10-12 Pending JPH0159231U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15578087U JPH0159231U (en) 1987-10-12 1987-10-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15578087U JPH0159231U (en) 1987-10-12 1987-10-12

Publications (1)

Publication Number Publication Date
JPH0159231U true JPH0159231U (en) 1989-04-13

Family

ID=31433709

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15578087U Pending JPH0159231U (en) 1987-10-12 1987-10-12

Country Status (1)

Country Link
JP (1) JPH0159231U (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59111588A (en) * 1982-12-17 1984-06-27 富士電機株式会社 Maintenance of photosensor accuracy
JPS60119528A (en) * 1983-12-01 1985-06-27 Canon Inc Control signal generator of camera
JPS60210718A (en) * 1984-04-04 1985-10-23 Sumitomo Electric Ind Ltd Light detection method
JPS6314135A (en) * 1986-07-04 1988-01-21 Fuji Photo Optical Co Ltd Shutter controller for camera

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59111588A (en) * 1982-12-17 1984-06-27 富士電機株式会社 Maintenance of photosensor accuracy
JPS60119528A (en) * 1983-12-01 1985-06-27 Canon Inc Control signal generator of camera
JPS60210718A (en) * 1984-04-04 1985-10-23 Sumitomo Electric Ind Ltd Light detection method
JPS6314135A (en) * 1986-07-04 1988-01-21 Fuji Photo Optical Co Ltd Shutter controller for camera

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