JPH0222817Y2 - - Google Patents
Info
- Publication number
- JPH0222817Y2 JPH0222817Y2 JP3581383U JP3581383U JPH0222817Y2 JP H0222817 Y2 JPH0222817 Y2 JP H0222817Y2 JP 3581383 U JP3581383 U JP 3581383U JP 3581383 U JP3581383 U JP 3581383U JP H0222817 Y2 JPH0222817 Y2 JP H0222817Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic tape
- light
- light emitting
- tape section
- emitting diode
- 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.)
- Expired
Links
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Description
【考案の詳細な説明】 本考案は磁気テープの終端検出装置に関する。[Detailed explanation of the idea] The present invention relates to a magnetic tape end detection device.
一般に磁気テープ１は第１図に示すように、磁
気テープ部２と終端（または始端）の透光性リー
ダテープ部３とからなり、従来の光透過式テープ
終端検出装置は、磁気テープ１に対向して発光ダ
イオード４を配置し、この発光ダイオード４に磁
気テープ１を介して対向する位置に受光素子５を
配置し、この受光素子５の磁気テープ部２とリー
ダテープ部３における受光量の差から磁気テープ
１の終端を検出するようにした構成を有する。 Generally, a magnetic tape 1 consists of a magnetic tape section 2 and a translucent leader tape section 3 at the end (or start end) of the magnetic tape 1, as shown in FIG. Light-emitting diodes 4 are arranged facing each other, and a light-receiving element 5 is arranged at a position facing the light-emitting diodes 4 with the magnetic tape 1 in between. It has a configuration in which the end of the magnetic tape 1 is detected from the difference.
そして、従来の磁気テープ１のリーダテープ部
２は無色透明、黄色半透明のものが多く用いら
れ、また、発光ダイオード４としては
たとえば、第２図符号ａで示すように910〜
940nmにピークがある近赤外のGaAs発光素子が
用いられる。これは、発光が直接人間の目に見え
ないためである。 The leader tape section 2 of the conventional magnetic tape 1 is often colorless and transparent or yellow and semitransparent, and the light emitting diode 4 is, for example, 910 to 910 as shown by reference numeral a in FIG.
A near-infrared GaAs light-emitting element with a peak at 940 nm is used. This is because the emitted light is not directly visible to the human eye.
ところが、最近になつて磁気テープ１のリーダ
テープ部３が青色半透明のものが市販されたが、
発光ダイオード４が近赤外発光または赤外発光の
ものでは、この近赤外光または赤外光が青色半透
明のリーダテープ部３を透過する際にほとんど減
衰されて、受光素子５の受光量が著しく低下し
て、磁気テープ２とリーダテープ部３の判別がで
きなかつた。 However, recently, a magnetic tape 1 with a blue translucent leader tape section 3 has been commercially available.
When the light-emitting diode 4 emits near-infrared light or infrared light, most of this near-infrared light or infrared light is attenuated when it passes through the blue translucent leader tape section 3, and the amount of light received by the light-receiving element 5 decreases. The magnetic tape 2 and the leader tape section 3 could not be distinguished.
第３図に数種の磁気テープＡ〜Ｅに対する磁気
テープ部およびリーダテープ部における受光素子
の出力電圧と実測結果を示す。実測結果による
と、青色半透明リーダテープ部を有する磁気テー
プＡでは磁気テープ部、リーダテープ部における
受光素子の出力電圧の電圧差（または変化量）が
−1.1Vと小さく、磁気テープ部とリーダテープ
部の判別が不可能であつた。また、磁気テープ
Ｂ，Ｄにおいても、電圧差（または変化量）が十
分大きくないために、時々誤動差をすることが確
認された。 FIG. 3 shows the output voltages and actual measurement results of the light receiving elements in the magnetic tape section and leader tape section for several types of magnetic tapes A to E. According to the actual measurement results, for magnetic tape A having a blue translucent leader tape section, the voltage difference (or amount of change) in the output voltage of the light receiving element between the magnetic tape section and the leader tape section was as small as -1.1V; It was impossible to distinguish the tape part. Furthermore, it has been confirmed that in magnetic tapes B and D, erroneous differences sometimes occur because the voltage difference (or amount of change) is not large enough.
本考案はこのような従来欠点を改良したもの
で、以下、第１図〜第３図を参照して説明する。 The present invention improves on these conventional drawbacks, and will be described below with reference to FIGS. 1 to 3.
本考案は、発光ダイオード４として、570nmに
ピークがある緑色のGaP発光素子を用いたもので
ある。GaP発光素子の波長−相対発光強度特性の
一例を第２図符号ｂで示す。 In the present invention, a green GaP light emitting element having a peak at 570 nm is used as the light emitting diode 4. An example of the wavelength-relative emission intensity characteristic of a GaP light emitting device is shown by reference numeral b in FIG.
また、このGaP発光素子（緑）を用いた場合
の、磁気テープＡ〜Ｅに対する磁気テープ部およ
びリーダテープ部における受光素子の出力電圧お
よびその電圧差を第３図に示す。 Furthermore, when this GaP light emitting element (green) is used, the output voltages of the light receiving elements in the magnetic tape section and the leader tape section for magnetic tapes A to E and the voltage differences therebetween are shown in FIG.
以上のように、本考案は、発先ダイオード４と
して緑色発光素子を用いた構成を有し、この緑色
光は無色透明、黄色半透明のリーダテープ部のみ
ならず、青色半透明のリーダテープ部をもほとん
ど減衰されることなく透過し、受光素子５に受光
されるので、いかなる色のリーダテープ部を有す
る磁気テープに対しても、リーダテープ部におけ
る受光素子５の出力電圧が十分大きくなり、磁気
テープ部、リーダテープ部における出力電圧の電
圧差（または変化量）が十分大きくなるため、磁
気テープ部とリーダテープ部の判別、すなわち、
磁気テープの終端検出が確実になり、誤動作もな
くなり、かつ、構造も他の部品を追加することも
なく単純である実用的な利点を有する。 As described above, the present invention has a configuration using a green light emitting element as the starting diode 4, and this green light is emitted not only from the colorless transparent and yellow semitransparent leader tape sections but also from the blue semitransparent leader tape section. The light is transmitted with almost no attenuation and is received by the light-receiving element 5, so that the output voltage of the light-receiving element 5 at the leader tape part is sufficiently large for any magnetic tape having a leader tape part of any color. Since the voltage difference (or amount of change) in the output voltage between the magnetic tape section and the leader tape section becomes sufficiently large, it is difficult to distinguish between the magnetic tape section and the leader tape section, i.e.
This method has practical advantages in that the end of the magnetic tape can be detected reliably, malfunctions are eliminated, and the structure is simple without adding any other parts.
第１図は本考案の磁気テープの終端検出装置の
構成を示す図、第２図は同、発光ダイオードの波
長−相対発光強度特性図、第３図は同、数種の磁
気テープに対する受光素子の出力電圧およびその
電圧差を示す図である。
１は磁気テープ、２は磁気テープ部、３はリー
ダテープ部、４は発光ダイオード、５は受光素子
である。
Fig. 1 is a diagram showing the configuration of the magnetic tape end detection device of the present invention, Fig. 2 is a wavelength-relative emission intensity characteristic diagram of a light emitting diode, and Fig. 3 is a photodetector for several types of magnetic tapes. FIG. 3 is a diagram showing the output voltage and the voltage difference thereof. 1 is a magnetic tape, 2 is a magnetic tape section, 3 is a leader tape section, 4 is a light emitting diode, and 5 is a light receiving element.
Claims (1)
らなる磁気テープ１に対向して発光ダイオード４
を配置し、当該発光ダイオード４に上記磁気テー
プ１を介して対向する位置に受光素子５を配置し
た構成において、上記発光ダイオード４として緑
色発光素子を用いたことを特徴とする磁気テープ
の終端検出装置。 A light emitting diode 4 is mounted opposite a magnetic tape 1 consisting of a magnetic tape section 2 and a translucent leader tape section 3.
and a light receiving element 5 is arranged at a position facing the light emitting diode 4 with the magnetic tape 1 interposed therebetween, and a green light emitting element is used as the light emitting diode 4. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581383U JPS59142922U (en) | 1983-03-11 | 1983-03-11 | Magnetic tape end detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3581383U JPS59142922U (en) | 1983-03-11 | 1983-03-11 | Magnetic tape end detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59142922U JPS59142922U (en) | 1984-09-25 |
| JPH0222817Y2 true JPH0222817Y2 (en) | 1990-06-20 |
Family
ID=30166499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3581383U Granted JPS59142922U (en) | 1983-03-11 | 1983-03-11 | Magnetic tape end detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59142922U (en) |
-
1983
- 1983-03-11 JP JP3581383U patent/JPS59142922U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59142922U (en) | 1984-09-25 |
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