JPS61145343U - - Google Patents
Info
- Publication number
- JPS61145343U JPS61145343U JP2614285U JP2614285U JPS61145343U JP S61145343 U JPS61145343 U JP S61145343U JP 2614285 U JP2614285 U JP 2614285U JP 2614285 U JP2614285 U JP 2614285U JP S61145343 U JPS61145343 U JP S61145343U
- Authority
- JP
- Japan
- Prior art keywords
- light
- tape
- emitting element
- beginning
- current flowing
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002834 transmittance Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
Description
第１図は本考案における一実施例のテープ始終
端検出回路の要部回路結線図、第２図は第１図の
各要部の波形図、第３図は従来のテープ始終端検
出回路を示す回路結線図、第４図は第３図の各要
部の波形図である。
１……テープ、４……電圧比較器、１０……ス
イツチ回路、１４……第２の電圧比較器。
Fig. 1 is a circuit diagram of the main parts of a tape start/end detection circuit according to an embodiment of the present invention, Fig. 2 is a waveform diagram of each main part of Fig. 1, and Fig. 3 is a circuit diagram of a conventional tape start/end detection circuit. The circuit connection diagram shown in FIG. 4 is a waveform diagram of each main part of FIG. 3. DESCRIPTION OF SYMBOLS 1... Tape, 4... Voltage comparator, 10... Switch circuit, 14... Second voltage comparator.
Claims (1)
磁気テープとの光透過率の差異を利用してテープ
始終端を検出すべく構成され、発光素子と、この
発光素子から発せられた光をテープを透過して受
光するように設けられた受光素子と、前記発光素
子に流す電流を立上り及び立下りに時定数をもた
せてパルス駆動させる手段を備えることを特徴と
するテープ始終端検出回路。 (2) 発光素子に流れる電流が基準値よりも多く
流れている期間のみ受光素子の受光レベルを判定
するようにしたことを特徴とする実用新案登録請
求の範囲第１項記載のテープ始終端検出回路。[Claims for Utility Model Registration] (1) It is configured to detect the beginning and end of the tape by utilizing the difference in light transmittance between the transparent tape and the magnetic tape provided at the beginning and end of the tape, and includes a light emitting element and the magnetic tape. A light-receiving element provided to transmit light emitted from the light-emitting element through the tape and receiving the light, and a means for pulse-driving the current flowing through the light-emitting element with a time constant at rise and fall. Tape start/end detection circuit. (2) Tape start/end detection according to claim 1 of the utility model registration, characterized in that the light reception level of the light receiving element is determined only during a period when the current flowing through the light emitting element is greater than a reference value. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2614285U JPS61145343U (en) | 1985-02-25 | 1985-02-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2614285U JPS61145343U (en) | 1985-02-25 | 1985-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61145343U true JPS61145343U (en) | 1986-09-08 |
Family
ID=30521874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2614285U Pending JPS61145343U (en) | 1985-02-25 | 1985-02-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61145343U (en) |
-
1985
- 1985-02-25 JP JP2614285U patent/JPS61145343U/ja active Pending