JPH03209652A - magnetic recording and reproducing device - Google Patents
magnetic recording and reproducing deviceInfo
- Publication number
- JPH03209652A JPH03209652A JP2004104A JP410490A JPH03209652A JP H03209652 A JPH03209652 A JP H03209652A JP 2004104 A JP2004104 A JP 2004104A JP 410490 A JP410490 A JP 410490A JP H03209652 A JPH03209652 A JP H03209652A
- Authority
- JP
- Japan
- Prior art keywords
- phototransistor
- light
- light emitting
- magnetic tape
- 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.)
- Pending
Links
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、磁気テープの始終端検出用の発光ダイオード
をカセットの外部に設けた場合でも、始終端検出動作が
可能なＶＴＲに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a VTR capable of detecting the start and end of a magnetic tape even when light emitting diodes for detecting the start and end of the magnetic tape are provided outside the cassette.
従来の技術
民生用ＶＴＲの磁気テープ始終端検出技術について、従
来のＶＨ８及びＶＨ３−ＣフォーマットのＶＴＲを例に
上げ第２図、及び第３図を用いて説明する。2. Description of the Related Art A magnetic tape start/end detection technique for a consumer VTR will be explained using FIGS. 2 and 3 using conventional VH8 and VH3-C format VTRs as examples.
第２図において、ＶＴＲのシャーシに設けられた発光ダ
イオード１０から発した光１０ａはＶＴＲに装着された
標準サイズのＶＨＳカセット２０の内部に設けられた光
導用の管もしくは光の通路２１を通り、磁気テープ２２
に達する。磁気テープ２２の始終端には、磁気材料が塗
布されていない透明なテープ（以下、リーダ部と略称す
る。）がおり、テープが前記リーダ部に達すると、発光
ダイオード１ｏの光１０ａは、フォトトランジスタ１１
によって検出され、ＶＴＲはテープの走行を止める。In FIG. 2, light 10a emitted from a light emitting diode 10 provided on the chassis of the VTR passes through a light guide tube or light path 21 provided inside a standard-sized VHS cassette 20 installed in the VTR. magnetic tape 22
reach. At the beginning and end of the magnetic tape 22, there is a transparent tape (hereinafter referred to as a leader section) on which no magnetic material is coated, and when the tape reaches the leader section, the light 10a of the light emitting diode 1o is converted into a photo. transistor 11
is detected, and the VTR stops running the tape.
次に第３図を用い小形サイズのＶＨ３−Ｃカセットを記
録再生し得るＶＴＲの磁気テープ始終端検出技術につい
て説′明する。ＶＨ３−Ｃカセットは、前記ＶＨＳカセ
ットのような発光ダイオードの出力を導く管２１を有し
ていない。従って発光ダイオード１０は、カセット３ｏ
の外部に位置することになる。発光ダイオード１ｏの出
力光１０ａは第３図のように発散し、その光の一部がテ
ープの前記透明なリーダ部に達した時フォトトランジス
タ１１によって検出される。Next, referring to FIG. 3, a technique for detecting the beginning and end of a magnetic tape for a VTR capable of recording and reproducing information on a small VH3-C cassette will be explained. The VH3-C cassette does not have a tube 21 for conducting the output of the light emitting diode like the VHS cassette. Therefore, the light emitting diode 10 is connected to the cassette 3o.
It will be located outside of. The output light 10a of the light emitting diode 1o is diverged as shown in FIG. 3, and when a part of the light reaches the transparent leader portion of the tape, it is detected by the phototransistor 11.
発明が解決しようとする課題
ところが第３図の構成では１発光ダイオード１０の出力
光１０＆は発散しているので、ＶＴＲ内部の部品１例え
ば回転シリンダ１２等に反射し、磁気テープのリーダ部
がフォトトランジスタ１１の近傍にないにもかかわらず
反射光１ｏｂがフォトトランジスタ１１に達し、誤動作
（テープ走行停止）を生じる。この課題は、フォトトラ
ンジスタ１１の検出出力が反射光１０ｂと、テープがリ
ーダ部に達した時の発光ダイオード１１の出力１０ａと
ではレベルが異なる事から、前記フォトトランジスタ１
１の検出感度を下げる事で反射光１ｏｂに応答しない様
にして解決し得るが、フォ））ランジヌタ１１の検出範
囲が小さくなり、発光ダイオード１ｏや、フォトトラン
ジスタ１１等の光素子の特性のばらつき及び磁気テープ
のリーダ部の光の透過度のばらつきに対する余裕がなく
なり、逆に誤動作が発生しやすくなる事が考えられ量産
を困難にする原因となる。Problems to be Solved by the Invention However, in the configuration shown in FIG. 3, the output light 10& of one light emitting diode 10 is diverging, so it is reflected on parts 1 inside the VTR, such as the rotating cylinder 12, and the leader part of the magnetic tape is exposed to the photo. Although the phototransistor 1ob is not near the transistor 11, the reflected light 1ob reaches the phototransistor 11, causing a malfunction (tape running stops). This problem arises because the level of the detection output of the phototransistor 11 is different between the reflected light 10b and the output 10a of the light emitting diode 11 when the tape reaches the leader section.
This can be solved by lowering the detection sensitivity of light emitting diode 1o and phototransistor 11 so as not to respond to the reflected light 1ob, but f)) the detection range of the range nut 11 becomes smaller, and variations in the characteristics of optical elements such as light emitting diode 1o and phototransistor 11 occur. Moreover, there is no margin for variations in light transmittance in the leader section of the magnetic tape, and malfunctions are more likely to occur, making mass production difficult.
課題を解決するための手段
本発明の磁気記録再生装置は、磁気テープの始終端検出
用の発光ダイオードをカセットの外部に設けたものにお
いて、受光用のフォトトランジスタの前部に、このフォ
トトランジスタのレンズ部と同一形状の穴を有する遮蔽
板を備えたものである。Means for Solving the Problems The magnetic recording/reproducing device of the present invention is one in which a light emitting diode for detecting the start and end of a magnetic tape is provided outside the cassette. It is equipped with a shielding plate having a hole having the same shape as the lens part.
作 用
本発明の磁気記録再生装置は、磁気テープの始終端検出
用のフォ））ランジヌタの前部にそのレンズ部と同一形
状の穴を有する遮蔽板を設ける事により、発光ダイオー
ドの出力光がＶＴＲ内部の部品によって反射し、前記フ
ォトトランジスタに入射する量を大幅に低減させ、磁気
テープのり一ダ部以外で前記部品による反射光によって
誤動作する事を防ぐことができる。Function: The magnetic recording/reproducing device of the present invention is provided with a shielding plate having a hole having the same shape as the lens part in the front part of the lanyard for detecting the beginning and end of the magnetic tape, so that the output light of the light emitting diode is It is possible to significantly reduce the amount of light reflected by internal parts of the VTR and incident on the phototransistor, and to prevent malfunctions caused by light reflected by the parts other than the magnetic tape glue part.
実施例
以下、本発明の一実施例の磁気記録再生装置を図面を参
照して説明する。Embodiment Hereinafter, a magnetic recording/reproducing apparatus according to an embodiment of the present invention will be explained with reference to the drawings.
第１図に示すように、ＶＨＳ−Ｃカ七ソ）３０の外部に
発光ダイオード１０を配置する。又５発光ダイオード１
ｏの出力光１０ａを検出するフォトトランジスタ１１の
前部に前記フォトトランジスタのレンズと同一形状の穴
１４を有する遮蔽板１３を設ける。前記遮蔽板１３は、
ＶＴＲ内部の部品による発光ダイオード１ｏの出力光の
反射光１０ｂがフォトトランジスタ１１に入るのを防ぐ
ため、できる限り大きくした方が良い。又、フォトトラ
ンジスタ１１と遮蔽板１３との距離はできるだけ大きく
とった方が良い。以上の構成により、反射光１０ｂがフ
ォトトランジスタ１１によって検出される量を大幅に低
減できる。As shown in FIG. 1, a light emitting diode 10 is placed outside a VHS-C camera 30. Also 5 light emitting diodes 1
A shielding plate 13 having a hole 14 having the same shape as the lens of the phototransistor is provided in front of the phototransistor 11 that detects the output light 10a of the phototransistor. The shielding plate 13 is
In order to prevent the reflected light 10b of the output light from the light emitting diode 1o from entering the phototransistor 11 by components inside the VTR, it is better to make it as large as possible. Further, it is better to keep the distance between the phototransistor 11 and the shielding plate 13 as large as possible. With the above configuration, the amount of reflected light 10b detected by phototransistor 11 can be significantly reduced.
なお、上記実施例では、磁気テープの供給側についての
み説明したが、本発明の構成は１巻取り側についても適
用し得るものであり、同一の効果を有する。又、本発明
は、Ｖ）（Ｓ−Ｃカセットを記録再生し得るＶＴＲだけ
でなく、ＶＨＳカセットとＶＨＳ−Ｃカセットの両方を
同じメカニズムに装着して記録再生する事が可能なＶＴ
Ｒにおいても同一の効果を発揮するものである。In the above embodiment, only the supply side of the magnetic tape was explained, but the structure of the present invention can also be applied to the one-winding side, and has the same effect. Furthermore, the present invention provides not only a VTR capable of recording and reproducing S-C cassettes, but also a VT capable of recording and reproducing both VHS cassettes and VHS-C cassettes by mounting them on the same mechanism.
The same effect is exhibited in R as well.
発明の効果
以上のように本発明の磁気記録再生装置は、磁気テープ
の始終端検出用のフォトトランジスタの前部にそのレン
ズと同一形状の穴を有する遮蔽板を設けたことによυ、
ＶＴＲ内部の部品による反射光の影響を大幅に低減させ
、フォトトランジスタの検出範囲を広げる事が可能とな
る。従って、発光ダイオードや、フォトトランジスタ等
の光素子の特性のばらつき及び磁気テープのリーダ部の
光の透過度のばらつきに対する余裕が大きくなり、誤動
作の発生を極めて少なくすることができる。Effects of the Invention As described above, the magnetic recording/reproducing apparatus of the present invention has a shielding plate having a hole having the same shape as the lens in front of the phototransistor for detecting the beginning and end of the magnetic tape.
The influence of reflected light from components inside the VTR can be significantly reduced, and the detection range of the phototransistor can be expanded. Therefore, there is greater margin for variations in the characteristics of optical elements such as light emitting diodes and phototransistors, and variations in the light transmittance of the leader section of the magnetic tape, and the occurrence of malfunctions can be extremely reduced.
更にフォトトランジスタの検出レベルを調整する回路や
その作業工程を設ける必要がなく安価に量産が可能とな
るものである。Furthermore, there is no need to provide a circuit for adjusting the detection level of the phototransistor and its work process, making it possible to mass-produce the device at low cost.
【図面の簡単な説明】
第１図は本発明の一実施例を示す上面図、第２図、第３
図は従来の磁気テープ始終端検出方式を説明する上面図
である。
１０・・・・・・発光ダイオード、１１・・・・・・フ
ォトトランジスタ、１３・・・・・・遮蔽板、１４・・
・・・・穴。[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a top view showing one embodiment of the present invention, FIG.
The figure is a top view illustrating a conventional magnetic tape start/end detection method. 10... Light emitting diode, 11... Phototransistor, 13... Shielding plate, 14...
····hole.
Claims (1)
トテープの外部に配し、受光用のフォトトランジスタの
前部に、このフォトトランジスタのレンズ部と同一形状
の穴を有する遮蔽板を備えた事を特徴とする磁気記録再
生装置。Light emitting diodes for detecting the beginning and end of the magnetic tape are arranged outside the cassette tape, and a shielding plate having a hole of the same shape as the lens part of this phototransistor is provided in front of the phototransistor for receiving light. Features of magnetic recording and reproducing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004104A JPH03209652A (en) | 1990-01-11 | 1990-01-11 | magnetic recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004104A JPH03209652A (en) | 1990-01-11 | 1990-01-11 | magnetic recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03209652A true JPH03209652A (en) | 1991-09-12 |
Family
ID=11575485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004104A Pending JPH03209652A (en) | 1990-01-11 | 1990-01-11 | magnetic recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03209652A (en) |
-
1990
- 1990-01-11 JP JP2004104A patent/JPH03209652A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3614453A (en) | Radiation sensitive cassette leader detector | |
| US4616274A (en) | Tape end detecting device for extractable tape type cassette | |
| US3596006A (en) | Cassette tape-strengthening patch and optical opening | |
| JPH03209652A (en) | magnetic recording and reproducing device | |
| JPH03209651A (en) | Magnetic recording and reproducing device | |
| EP0610933B1 (en) | Camera adapted for films provided with magnetic storage portions | |
| JPS60236177A (en) | Tape cassette | |
| JP2976555B2 (en) | Tape end detection mechanism | |
| US6154617A (en) | Camera to reduce effect of magnetic flux emitted from drive motor | |
| JP3002578B2 (en) | Magnetic tape cassette | |
| JP2557126Y2 (en) | Tape cassette | |
| JPS6020220Y2 (en) | magnetic tape cassette | |
| JPS6012822U (en) | Optical recording information reproducing device | |
| JPS6025710Y2 (en) | Tape sensor device | |
| JPH0416258Y2 (en) | ||
| JPH08190748A (en) | Detecting structure of start and end of tape | |
| JPH0437304Y2 (en) | ||
| JPH0454574Y2 (en) | ||
| JPS6319926Y2 (en) | ||
| JPS59185744U (en) | Head and tape position detection device | |
| JPS6154090A (en) | Tape cassette | |
| JPS5956690U (en) | tape cassette | |
| JPH06195937A (en) | Tape cassette | |
| JPS5839749U (en) | Rotation detection device for rotating members in tape recorders, etc. | |
| JPS5977650A (en) | Information recording or information reproducing device |