JPH0481232U - - Google Patents
Info
- Publication number
- JPH0481232U JPH0481232U JP12717290U JP12717290U JPH0481232U JP H0481232 U JPH0481232 U JP H0481232U JP 12717290 U JP12717290 U JP 12717290U JP 12717290 U JP12717290 U JP 12717290U JP H0481232 U JPH0481232 U JP H0481232U
- Authority
- JP
- Japan
- Prior art keywords
- reel
- receiving means
- rotational speed
- light emitting
- reflected light
- 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 10
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案の一実施例であるテープレコー
ダのリール回転速度検出装置に用いられる反射板
を示す平面図、第２図はそのリール回転速度検出
装置の概略的な構成を示すブロツク図図、第３図
はそのリール回転速度検出装置におけるフオトイ
ンタラプタからの検出信号を示す波形図、第４図
はそのリール回転速度検出装置の動作を示すフロ
ーチヤート、第５図は他の実施例における検出信
号を示す波形図、第６図は従来のリール回転速度
検出装置ニ用いられる反射板を示す平面図、第７
図はそのリール回転速度検出装置におけるフオト
インタラプタからの検出信号を示す波形図である
。
１１……反射板、１１Ａ１……幅の広い明領域
、１１Ｂ１……幅の広い暗領域、１１Ａ２……幅
の狭い明領域、１１Ｂ２……幅の狭い暗領域、１
２……リールモータ、１３……リール、１４……
回転軸、１５……リール台、１６……フオトイン
タラプタ、２１……制御回路、２２……モータ駆
動回路、２３ａ，２３ｂ……選択スイツチ、２４
……スタートスイツチ。
FIG. 1 is a plan view showing a reflector used in a reel rotation speed detection device for a tape recorder which is an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of the reel rotation speed detection device. , FIG. 3 is a waveform diagram showing the detection signal from the photo interrupter in the reel rotation speed detection device, FIG. 4 is a flowchart showing the operation of the reel rotation speed detection device, and FIG. 5 is a detection signal in another embodiment. FIG. 6 is a waveform diagram showing signals; FIG. 6 is a plan view showing a reflector used in a conventional reel rotation speed detection device; FIG.
The figure is a waveform diagram showing a detection signal from a photo interrupter in the reel rotation speed detection device. 11...Reflector, 11A1...Wide bright area, 11B1...Wide dark area, 11A2...Narrow bright area, 11B2...Narrow dark area, 1
2... Reel motor, 13... Reel, 14...
Rotating shaft, 15... Reel stand, 16... Photo interrupter, 21... Control circuit, 22... Motor drive circuit, 23a, 23b... Selection switch, 24
...Start switch.
Claims (1)
として放射状に区分された明領域と暗領域とが交
互に並び縞模様を表面に持つ反射板と、リールの
回転時に前記反射板の表面に光を照射し、当該反
射板表面からの反射光を受光して反射光の強度変
化を検出する投受光手段とを含み、当該投受光手
段の検出する反射光の強度変化からリールの回転
速度を検出するようにしたリール回転速度検出装
置において、 前記反射板の縞模様を、リールが所定の高速回
転時にも前記投受光手段によつて検出可能な広い
幅の明領域および暗領域と、これらの領域の途中
に介在し、リールが所定の低速回転時にだけ検出
可能な狭い幅の暗領域または明領域とで構成した
ことを特徴とするをリール回転速度検出装置。[Claims for Utility Model Registration] A reflector plate fixed to the rotation axis of a reel and having a striped pattern on its surface in which bright areas and dark areas are alternately divided radially around the rotation axis, and rotation of the reel. and a light emitting/receiving means for irradiating light onto the surface of the reflecting plate, receiving the reflected light from the reflecting plate surface, and detecting a change in the intensity of the reflected light, the intensity of the reflected light detected by the light emitting/receiving means. In a reel rotational speed detection device that detects the rotational speed of a reel from changes in the rotational speed of the reel, the striped pattern of the reflective plate is a wide bright area that can be detected by the light emitting/receiving means even when the reel rotates at a predetermined high speed. and a dark region, and a narrow dark region or bright region interposed between these regions and detectable only when the reel rotates at a predetermined low speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12717290U JPH0481232U (en) | 1990-11-28 | 1990-11-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12717290U JPH0481232U (en) | 1990-11-28 | 1990-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0481232U true JPH0481232U (en) | 1992-07-15 |
Family
ID=31874685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12717290U Pending JPH0481232U (en) | 1990-11-28 | 1990-11-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0481232U (en) |
-
1990
- 1990-11-28 JP JP12717290U patent/JPH0481232U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0481232U (en) | ||
| JPS5537947A (en) | Method and device for automatic detection of welded part of wheel rim or the like | |
| JPS6127834B2 (en) | ||
| JPH0372314U (en) | ||
| JPS601674U (en) | Steering angle detection device | |
| JPH0361694U (en) | ||
| JPH079207Y2 (en) | Optical pickup tilt adjustment device | |
| JPH03121588U (en) | ||
| JPH0711766B2 (en) | Home return method | |
| JPH0289663U (en) | ||
| JPS5830290Y2 (en) | Record player arm horizontal position control device | |
| JPH0313871Y2 (en) | ||
| JPS5525827A (en) | Player device | |
| JPH02110003U (en) | ||
| JPS59137524U (en) | Rotating body rotation speed and position detection device | |
| JPS6123140U (en) | Opening/closing state detection device for switches, etc. | |
| JPS6082919A (en) | Electromagnetic pickup type detecting device of number of revolution | |
| JPS61161705U (en) | ||
| JPS6359433U (en) | ||
| JPH0435218U (en) | ||
| JPH10124987A (en) | Disk device | |
| JPH0235343U (en) | ||
| JPS644959A (en) | Magnetic disk device | |
| JPS58203677A (en) | Auto tracking device of magnetic disk | |
| JPS63168662U (en) |