JPH0685221B2 - Optical head position detector - Google Patents
Optical head position detectorInfo
- Publication number
- JPH0685221B2 JPH0685221B2 JP1046486A JP1046486A JPH0685221B2 JP H0685221 B2 JPH0685221 B2 JP H0685221B2 JP 1046486 A JP1046486 A JP 1046486A JP 1046486 A JP1046486 A JP 1046486A JP H0685221 B2 JPH0685221 B2 JP H0685221B2
- Authority
- JP
- Japan
- Prior art keywords
- optical head
- position detector
- interrupt
- detecting
- head position
- 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 - Lifetime
Links
- 230000003287 optical effect Effects 0.000 title claims description 33
- 230000005693 optoelectronics Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光学式記録再生装置において、光学ヘツドの
位置を電気信号として検出する光学ヘツド位置検出器に
関する。The present invention relates to an optical head position detector for detecting the position of an optical head as an electric signal in an optical recording / reproducing apparatus.
〔発明の概要〕 本発明は、光学式記録再生装置の光学ヘツドの位置検出
手段において、反射光電型のインタラプトセンサを２個
対向させて設け、光学ヘツドに固定したこう配を有する
反射板で２個のインタラプトセンサのギヤツプ変化を検
出することにより、非接触で小型かつ安価で、差動検出
のために温度変化、ノイズの影響を受けにくい光学ヘツ
ドの位置検出を可能とした。SUMMARY OF THE INVENTION According to the present invention, in a position detecting means of an optical head of an optical recording / reproducing apparatus, two reflective photoelectric interrupt sensors are provided so as to face each other, and two reflective plates having a gradient are fixed to the optical head. By detecting the gear change of the interrupt sensor, it is possible to detect the position of the optical head which is non-contact, small and inexpensive, and which is less susceptible to temperature change and noise due to differential detection.
従来、光学ヘツドのアクセス制御を実現するために光学
ヘツドの位置検出には、ポテンシヨメータ，エンコー
ダ，イメージセンサ等が用いられており、特開昭57−53
8380に開示された方法などがある。Conventionally, a potentiometer, an encoder, an image sensor, etc. have been used to detect the position of the optical head in order to realize the access control of the optical head.
For example, the method disclosed in 8380.
しかし、ポテンシヨメータは接触形のために寿命、信頼
性の点で問題があり、エンコーダ，イメージセンサを用
いると装置のコストアップが避けられない。また、位置
検出器を設けずにアクセスを行なう場合は、アクセスタ
イムが遅くなることが問題となる。However, since the potentiometer is a contact type, it has a problem in terms of life and reliability, and if an encoder or an image sensor is used, the cost of the device is inevitably increased. Further, when the access is performed without providing the position detector, there is a problem that the access time is delayed.
そこで本発明はこのような問題点を解決するもので、そ
の目的とするところは、寿命、信頼性の面から非接触で
光学ヘツドの位置検出を行い、小型、安価で光学式記録
再生装置のコストアツプを避け、かつ差動検出とするこ
とで温度変化、ノイズにも強い光学ヘツド位置検出器を
提供し、光学ヘツドの高速アクセスを可能とするところ
にある。Therefore, the present invention solves such a problem, and an object of the present invention is to detect the position of an optical head in a non-contact manner in terms of life and reliability, and to provide a compact, inexpensive optical recording / reproducing apparatus. By avoiding cost-up and performing differential detection, we provide an optical head position detector that is strong against temperature changes and noise, enabling high-speed access to the optical head.
本発明の光学ヘツド位置検出器は、光学式記録再生装置
の位置を検出する手段において、固定フレームに設けら
れた２個の対向する光電型のインタラプトセンサと、前
記光学ヘツドに固定され、こう配を有する反射板を前記
インタラプトセンサ間に配し、前記反射板と、前記イン
タラプトセンサとのギヤツプ変化を差動検出することに
よつて前記光学ヘツドの位置検出を行うことを特徴とす
る。The optical head position detector of the present invention comprises, in the means for detecting the position of the optical recording / reproducing apparatus, two optoelectronic interrupt sensors facing each other provided on a fixed frame and fixed on the optical head. A position of the optical head is detected by arranging a reflection plate provided between the interrupt sensors and differentially detecting a gear change between the reflection plate and the interrupt sensor.
本発明の上記の構成によれば、光学ヘツドの移動によつ
てインタラプトセンサと反射板のギヤツプが変化するた
めに、インタラプトセンサの出力を差動検出することに
よつて光学ヘツドの位置検出が可能である。According to the above configuration of the present invention, since the gap between the interrupt sensor and the reflector changes due to the movement of the optical head, the position of the optical head can be detected by differentially detecting the output of the interrupt sensor. Is.
以下図面を用いて本発明について詳細に説明する。 The present invention will be described in detail below with reference to the drawings.
第１図は本発明の光学ヘツド位置検出器の主要構成図で
ある。光学ヘツド１は、２本の支持シヤフト２によつて
直線運動のみが可能な状態に支持され、その運動方向に
こう配を有する反射板３が２つのインタラプトセンサ４
の間を移動することにより反射板とインタラプトセンサ
のギヤツプが変化し、それを差動検出することによつて
光学ヘツドの位置検出を実現している。FIG. 1 is a main block diagram of the optical head position detector of the present invention. The optical head 1 is supported by the two support shafts 2 in a state where only linear movement is possible, and the reflector 3 having a gradient in the movement direction has two interrupt sensors 4.
The gap between the reflector and the interrupt sensor is changed by moving between them, and the position of the optical head is realized by differentially detecting it.
第２図は、インタラプトセンサ配置図で、２つのギヤツ
プd1,d2は、和が一定の状態で変化する。FIG. 2 is an interrupt sensor layout diagram in which two gears d 1 and d 2 change in a state where the sum is constant.
第３図は、検出回路図で、ここではインタラプトセンサ
にLEDとフオトトランジスタが一体化された構造のもの
を用いている。FIG. 3 is a detection circuit diagram. Here, an interrupt sensor having a structure in which an LED and a phototransistor are integrated is used.
第４図は、ギヤツプd1,d2の変化と、インタラプトセン
サの出力A,B（第３図参照）の変化を示す差動出力特性
図で、変化の様子は模式的に表わしてある。実際には、
直線性の良好な範囲にギヤツプを設定すれば良い。差動
検出の利点としては、たとえば周囲温度の変化によりA,
Bの出力特性が第４図に示した一点鎖線のように変化し
ても差動出力Ｖはほとんど変化せずに第４図のように
Ｖ′が得られる。またノイズの影響を受けにくくなる。FIG. 4 is a differential output characteristic diagram showing changes in the gears d 1 and d 2 and changes in the outputs A and B (see FIG. 3) of the interrupt sensor, and the state of the changes is schematically shown. actually,
It suffices to set the gears in a range with good linearity. The advantage of differential detection is that, for example, when the ambient temperature changes, A,
Even if the output characteristic of B changes as shown by the alternate long and short dash line in FIG. 4, the differential output V hardly changes and V'is obtained as shown in FIG. It also becomes less susceptible to noise.
以上の構成でギヤツプ変化を検出することにより光学ヘ
ツドの位置を検出することが可能となる。With the above configuration, the position of the optical head can be detected by detecting the gear change.
尚、インタラプトセンサは、赤外光タイプを利用すれ
ば、外来可視光の悪影響を減らすことができる。If the interrupt sensor uses an infrared light type, it is possible to reduce the adverse effects of external visible light.
以上述べたように本発明によれば、光学ヘツドの位置検
出を非接触で行うことが可能で、安価で小型な構造で、
差動検出を行つているために温度変化の影響を受けにく
く、ノイズに強い光学ヘツド位置検出器が構成できるた
め、光学ヘツドの高速アクセス可能となる。As described above, according to the present invention, the position of the optical head can be detected in a non-contact manner, with an inexpensive and compact structure,
Since differential detection is performed, the optical head position detector is resistant to the influence of temperature changes and resistant to noise, so that the optical head can be accessed at high speed.
第１図は本発明の光学ヘツド位置検出器の主要構成図。 第２図はインタラプトセンサ配置図。 第３図は検出部回路図。 第４図は差動出力特性図。 ５……差動増幅器 FIG. 1 is a main configuration diagram of an optical head position detector of the present invention. Figure 2 is an interrupt sensor layout. FIG. 3 is a detector circuit diagram. FIG. 4 is a differential output characteristic diagram. 5: Differential amplifier
Claims (1)
ドの位置を検出する手段において、固定フレームに設け
られた２個の対向する光電型のインタラプトセンサと、
前記光学ヘツドに固定され、こう配を有する反射板を前
記インタラプトセンサ間に配し、前記反射板と、前記イ
ンタラプトセンサとのギヤツプ変化を差動検出すること
によつて前記光学ヘツドの位置検出を行うことを特徴と
する光学ヘツド位置検出器。1. A means for detecting the position of an optical head of an optical recording / reproducing apparatus according to the present invention, comprising two optoelectronic interrupt sensors provided on a fixed frame, the photoelectric sensors being opposed to each other.
Positioning of the optical head is performed by arranging a reflector having a gradient fixed to the optical head between the interrupt sensors and differentially detecting a gear change between the reflector and the interrupt sensor. An optical head position detector characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1046486A JPH0685221B2 (en) | 1986-01-21 | 1986-01-21 | Optical head position detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1046486A JPH0685221B2 (en) | 1986-01-21 | 1986-01-21 | Optical head position detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62170029A JPS62170029A (en) | 1987-07-27 |
| JPH0685221B2 true JPH0685221B2 (en) | 1994-10-26 |
Family
ID=11750854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1046486A Expired - Lifetime JPH0685221B2 (en) | 1986-01-21 | 1986-01-21 | Optical head position detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0685221B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6149344B2 (en) * | 2012-04-04 | 2017-06-21 | セイコーエプソン株式会社 | Printing apparatus and printing method |
-
1986
- 1986-01-21 JP JP1046486A patent/JPH0685221B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62170029A (en) | 1987-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5349371A (en) | Electro-optical mouse with means to separately detect the changes in contrast ratio in X and Y directions | |
| US7408654B1 (en) | Method for measuring position, linear velocity and velocity change of an object in two-dimensional motion | |
| US3954339A (en) | Angular sensor | |
| US6020967A (en) | Differential displacement optical sensor | |
| JPH0685221B2 (en) | Optical head position detector | |
| JP2596975B2 (en) | Eyeglass lens frame shape measuring device | |
| JPS63293426A (en) | Pyroelectric infrared detector | |
| CA2303629C (en) | Differential displacement optical sensor - ii | |
| JP2808654B2 (en) | Eyeglass lens left / right discrimination device | |
| SU590598A1 (en) | Device for contacless measuring of transparent plate thickness | |
| JP3042061U (en) | Pyroelectric infrared sensor | |
| JPS62223819A (en) | Optical head position and speed detector | |
| JPH01235822A (en) | Noncontact detector for torque | |
| JPS5917029Y2 (en) | Linear tracking arm stop position control device | |
| JPS62182631A (en) | Load detector | |
| SU894357A1 (en) | Device for measuring lateral dimensions of lengthy articles | |
| JPH04246Y2 (en) | ||
| JPH0710278Y2 (en) | Refractive index measuring device | |
| JPH0452830Y2 (en) | ||
| JPS6246808B2 (en) | ||
| SU1714349A1 (en) | Photoelectric sensor | |
| JPH0458139A (en) | Infrared optical device | |
| JPH02118415A (en) | position detector | |
| SU1073734A1 (en) | Device for registering gravimeter sensing element position | |
| JPH0295210A (en) | Optical encoder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |