JPS5931776B2 - optical reader - Google Patents
optical readerInfo
- Publication number
- JPS5931776B2 JPS5931776B2 JP51047616A JP4761676A JPS5931776B2 JP S5931776 B2 JPS5931776 B2 JP S5931776B2 JP 51047616 A JP51047616 A JP 51047616A JP 4761676 A JP4761676 A JP 4761676A JP S5931776 B2 JPS5931776 B2 JP S5931776B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- displacement
- reading
- data carrier
- optical reading
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Description
【発明の詳細な説明】
本発明は円板またはテープのような可動データ担体上の
トラツク中に記録された情報を光学的に読取る装置、特
に光学的焦点を用いた読取装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for optically reading information recorded in tracks on a movable data carrier, such as a disk or a tape, and in particular to a reading device using an optical focus.
高密度で記録された情報の光学的読取は非常に小さな寸
法の点により照明されることを要する上記トラツク上に
光ビームの正確な焦点を結ばせる点に問題があつた。Optical reading of densely recorded information has been problematic in accurately focusing a light beam onto the track, which requires illumination by a point of very small size.
上記焦点の上下方向への変位と関連せしめられ、上記焦
点と上記トラツクとの間の上下方向の距離を表わす誤差
信号を受けて上記光学的読取装置の１要素を変位せしめ
ることはよく知られている。It is well known to displace an element of the optical reading device in response to an error signal associated with a vertical displacement of the focal point and representative of the vertical distance between the focal point and the track. There is.
この種の光学的読取装置は上記焦点の変位を上記誤差の
緩やかな変化に従つて制御することを可能にするか上記
誤差が急速に変化する場合上記焦点の誤差を補償するた
めにはこれら装置の速度は余りに遅かつた。本発明によ
り、可動担体により支持されるトラツクに溢つて記録さ
れたデータを読取るに適した光学的読取装置が設けられ
、この光学的読取装置は共通の光軸をもちこの光軸に溢
つて変位される第１および第２の光学要素よりなる光学
的読取ヘツドを含み、上記読取ヘツドは読取用輻射線を
上記トラツク上に投射し上記第１および第２の光学要素
の変位により上記輻射線の焦点位置を変位せしめ、上記
光学的読取装置はさらに上記データ担体から得られる読
取輻射線を検出し、かつ上記焦点と上記トラック間の距
離に相当する誤差信号を送出するに適する検出装置と、
この誤差信号を受けてある制限周波数よりも低い周波数
および高い周波数をもつた第１および第２の制御信号を
供給するに適したフイルタ装置と、上記第１および第２
の制御信号をそれぞれ受けて上記第１および第２の光学
要素の変位をそれぞれ制御するに適した第１および第２
の変位装置を含んでいる。Optical reading devices of this kind make it possible to control the displacement of the focus according to gradual changes in the error, or to compensate for the error in the focus if the error changes rapidly. The speed was too slow. According to the invention, an optical reading device is provided which is suitable for reading data recorded over a track supported by a movable carrier, which optical reading device has a common optical axis and is displaced over this optical axis. an optical read head comprising first and second optical elements, the read head projecting read radiation onto the track, and displacing the first and second optical elements, the read head comprising a first and a second optical element; a detection device suitable for displacing the focal point position, the optical reading device further detecting the reading radiation obtained from the data carrier and emitting an error signal corresponding to the distance between the focal point and the track;
a filter device suitable for receiving the error signal and supplying first and second control signals having frequencies lower and higher than a certain limit frequency;
first and second optical elements suitable for respectively receiving control signals and controlling displacements of said first and second optical elements, respectively;
displacement device.
以下添付の図面により本発明の実施例を詳細に説明する
。Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
読取用光ビームによりデータ担体上のトラツクからデー
タを読取る本発明による反射光学的データ読取装置を示
す第１図において、コピーラットな光源から得られる光
ビーム１は光ビーム１の光学軸上にその中心を有する鏡
２により受取られる。In FIG. 1, which shows a reflective optical data reading device according to the invention for reading data from a track on a data carrier by means of a reading light beam, a light beam 1 obtained from a copylat light source is located on the optical axis of the light beam 1. It is received by a mirror 2 having a center.
上記鏡２は軽量に作られかつピエゾ電気要素上に取付け
られ、この要素が高周波の交番電気信号による制御の下
に振動せしめられる時上記鏡２は数１０ミクロン以下の
小振幅で振動せしめられる。鏡２上に受取られた光線は
上記入射ビーム１を通過せしめる円形の窓をもつた鏡４
に向け反射される。鏡４は光ビーム１の光軸上にその中
心をもつている。鏡２および４の曲率半径は、鏡４から
の上記反射光線が静止状態において入射ビーム１の光軸
上の１点０に収束するよう選らばれている。トラツク７
を支持するデータ和体６は当初の時点で上記点０が上記
トラツク上に位置するよう配置されている。上記鏡４は
支持具５上に取付けられる。トラツク７により回折され
かつ担体６を透過した輻射線はその一方が上記光軸のト
ラツクの進行方向に関して前方にその他方が同じく後方
に上記光学系の光軸に関して対称に配置された２個の光
電検知器８および９により検出される。これらの検知器
から得られる電気信号からよく知られた装置を用いてビ
ームの焦点０と読取られるべきトラツクとの間の距離を
示す誤差信号を得ることができ、このような装置として
例えば位相比較器１０が用いられる。上記焦点誤差信号
はフイルタ１１および１２に加えられ、前者は遮断周波
数Ｆ。The mirror 2 is made lightweight and mounted on a piezoelectric element, and when this element is oscillated under the control of high-frequency alternating electrical signals, the mirror 2 is oscillated with a small amplitude of less than a few tens of microns. The light beam received on mirror 2 is passed through mirror 4, which has a circular window through which the incident beam 1 passes.
reflected towards. The mirror 4 has its center on the optical axis of the light beam 1. The radii of curvature of the mirrors 2 and 4 are chosen such that the reflected ray from mirror 4 converges at a point 0 on the optical axis of the incident beam 1 in the stationary state. Truck 7
The data summation 6 supporting the is initially arranged so that the point 0 is located on the track. The mirror 4 is mounted on a support 5. The radiation diffracted by the track 7 and transmitted through the carrier 6 is transmitted to two photoelectrons arranged symmetrically with respect to the optical axis of the optical system, one of which is in front with respect to the traveling direction of the track of the optical axis and the other with respect to the rear. Detected by detectors 8 and 9. From the electrical signals obtained from these detectors an error signal indicating the distance between the focus 0 of the beam and the track to be read can be obtained using well-known devices, such as e.g. A container 10 is used. The focus error signal is applied to filters 11 and 12, the former having a cutoff frequency F.
の低域沢波器であり、後者は同じく遮断周波数Ｆ。をも
つた高域沢波器である。従つて低域沢波器１１からの出
力信号は焦点誤差の緩やかな変化に対応し一方高域沢波
器１２からの出力信号はその急速な変化に対応する。前
者の出力信号は電気力学的コイル１３に加えられ後者の
出力はピエゾ電気結晶３に加えられる。２つの沢波器１
１および１２の通過帯域を規定する上記共通の周波数Ｆ
。This is a low-frequency wave generator, and the latter also has a cut-off frequency of F. It is a high frequency wave device with Therefore, the output signal from the low frequency waveform generator 11 corresponds to gradual changes in the focus error, while the output signal from the high frequency waveform generator 12 corresponds to its rapid changes. The output signal of the former is applied to the electrodynamic coil 13 and the output of the latter is applied to the piezoelectric crystal 3. Two sawnami devices 1
The above common frequency F defining passbands 1 and 12
.
は上記低速装置の動作帯域およびこの周波数での上記装
置の位相変化によつて定められ、例えば１５０Ｈｚ程度
であつてもよい。第１の制御範囲はその中に飽和領域を
含まないよう慎重に制限され、このため制御信号の振幅
が本装置の吸引範囲に達する時上記制御は急速に作用す
る。is determined by the operating band of the low-speed device and the phase change of the device at this frequency, and may be, for example, on the order of 150 Hz. The first control range is carefully limited to include no saturation region within it, so that the control acts rapidly when the amplitude of the control signal reaches the suction range of the device.
高周波数で生じる焦点の変位に対してはそれが相当な加
速に相当するため軽量の光学要素のみが変位せしめられ
る。For focal displacements occurring at high frequencies, only light optical elements are displaced, since this corresponds to a considerable acceleration.
本装置はまた可聴周波数範囲内で相当な容積の変位によ
り発生される騒音の量を減少せしめることができる。The device is also capable of reducing the amount of noise generated by significant volume displacements within the audio frequency range.
この光学装置は後述される装置と同様によく規定された
一対の物体および像位置に対し設計されており、本装置
の１あるいはそれ以上の要素の変位は種々の収差を生じ
て読取用のスポツトを劣化せしめる。This optical device, like the devices described below, is designed for a well-defined pair of object and image positions, and displacement of one or more elements of the device produces various aberrations that change the reading spot. cause deterioration.
本装置は従つて高性能のものでなければならず、かつ回
折によつて制限される。変位は常に１０分の数ミリメー
トルよりも少いがこれにより収差の導入は回折スポツト
の中心における輻射線強度を減少せしめ回折リングの強
度を増加する効果をもつている。上記スポツトの中心に
おける強度の低下が最大強度の２０％以下であれば収差
による回折スポツトの変形は少ないものと仮定して支障
がない。本光学装置の各要素は従つてデータ担***置の
上下方向変化およびデータ担体上のトラツクの変形によ
り定められる範囲内で良質の焦点がえられるよう定めら
れる。The device must therefore be of high performance and is limited by diffraction. The displacement is always less than a few tenths of a millimeter, so that the introduction of aberrations has the effect of reducing the radiation intensity at the center of the diffraction spot and increasing the intensity of the diffraction ring. If the decrease in intensity at the center of the spot is 20% or less of the maximum intensity, it is assumed that the deformation of the diffraction spot due to aberration is small and there is no problem. Each element of the optical device is thus defined in such a way that a good focus is obtained within the range defined by the vertical variation of the data carrier position and the deformation of the tracks on the data carrier.
実施に当つて沢波器１１および１２から得られる出力信
号は増幅され、電気力学的コイルおよびピエゾ電気要素
にそれぞれ加えられる電圧は上記誤差信号による偏差を
補償した焦点の変位を与える。In practice, the output signals obtained from waveforms 11 and 12 are amplified and the voltages applied to the electrodynamic coil and piezoelectric element, respectively, provide a focal displacement that compensates for deviations due to the error signals.
かくてピエゾ電気要素に加えられる電圧は数ミクロンの
変位に対し数百ボルトの程度である。第２図は本発明に
よる屈折光学的読取装置の光学部分を示す。光ビーム１
は収束レンズ１４、第２の収束レンズ１５、収束メニス
カスレンズ１６、および第２のメニスカスレンズ１７よ
りなる読取ヘツドを用いてデータ担体６に支持されるト
ラツク７上の点０に収束せしめられる。The voltage applied to the piezoelectric element is thus on the order of a few hundred volts for a displacement of a few microns. FIG. 2 shows the optical part of a refractive optical reader according to the invention. light beam 1
is focused to point 0 on the track 7 carried on the data carrier 6 using a reading head consisting of a converging lens 14, a second converging lens 15, a converging meniscus lens 16 and a second meniscus lens 17.
要素１４，１６、および１７は第１図に示されたと同様
な電気力学的装置により本光学系の光軸に平行に低周波
数で変位せしめられる枠１８に取付けられている。Elements 14, 16 and 17 are attached to a frame 18 which is displaced at low frequency parallel to the optical axis of the optical system by an electrodynamic device similar to that shown in FIG.
収束レンズ１５はまた支持部１８により支持されると共
にこの支持部１８に対して系の光軸に平行に変位せしめ
られる。The converging lens 15 is also supported by a support 18 and is displaced relative to this support 18 parallel to the optical axis of the system.
このために環状のピエゾ電気要素１９がレンズ１５に固
定され、この要素１９に電気信号が加えられるときレン
ズ１５を上記ピエゾ電気要素１９の運動に追従せしめる
。枠およびレンズ１５が同時に変位せしめられるとき焦
点に関する限りその変位は枠の変位とレンズ１５の変位
とによる変位量に等しい。ｐ
横方向の拡大率がＧ−[メiここでｐはレンズ中心より物
体までの距離、ｐ▼は同じく像までの距離）である光学
装置に対しては１対の物体および像位置に対する軸方向
拡大率はＧ２に等しい。For this purpose, an annular piezoelectric element 19 is fixed to the lens 15, causing the lens 15 to follow the movement of said piezoelectric element 19 when an electrical signal is applied to said element 19. When the frame and the lens 15 are simultaneously displaced, the displacement is equal to the displacement of the frame and the lens 15 as far as the focal point is concerned. p For an optical device whose lateral magnification is G-[Mei, where p is the distance from the lens center to the object, and p▼ is the distance to the image, there is a pair of axes for the object and image positions. The directional magnification factor is equal to G2.
輻射線源は固定されている故この光学装置が光軸方向△
Ｘだけ移動せしめられるとこれに応じる像位置の変位は
△Ｘ−△Ｘ／Ｇ２に等しい。上述の光学装置組立体は２
つの要素に分割し得、その第１のものは大きな拡大率Ｇ
を有し、軽量の要素１５を除いた読取ヘツドの組立体に
より構成され、それによる像位置はＩであり、その第２
の要素は１より小さな拡大率ＧＶをもつたレンズ１５に
より構成される。Since the radiation source is fixed, this optical device
When the image is moved by X, the corresponding displacement of the image position is equal to △X - △X/G2. The above-mentioned optical device assembly consists of two
can be divided into two elements, the first of which is a large magnification factor G
and consists of an assembly of the reading head excluding the lightweight element 15, the image position being I and its second
The element is constituted by a lens 15 with a magnification GV smaller than 1.
枠１８を△Ｘだけ変位せしめると像位置１は第１の要素
によりｄだけ変位せしめられ、このｄはほ＼△Ｘに等し
い。軽量要素もまたそれが枠１８に取付けられるため△
Ｘだけ変位せしめられ、レンズ１５に対しては物***置
に相当する上記像位置１と上記レンズ１５の中心との間
の距離はレンズ１５の変位がない限り一定である。また
△Ｘ／Ｇ２は無視しうるため上記に応じた焦点の変位は
ほぼ△Ｘに等しい。もしもレンズ１５が上記と同時に△
Ｘｉだけ変位されたとすると、焦点０のそれによる変位
は△Ｘ！が無Ｌ−ΔＡ視しうるため丁百に等しい。When the frame 18 is displaced by ΔX, the image position 1 is displaced by d by the first element, and this d is approximately equal to △X. The lightweight element is also △ since it is attached to the frame 18.
The distance between the image position 1, which corresponds to the object position with respect to the lens 15, and the center of the lens 15 is constant as long as the lens 15 is not displaced. Further, since ΔX/G2 can be ignored, the displacement of the focus according to the above is approximately equal to ΔX. If lens 15 is △ at the same time as above
If it is displaced by Xi, the resulting displacement of focal point 0 is △X! is equal to 100 because it can be seen as having no L-ΔA.
これら２種の変位ハＸによる合計変位ｄ−△Ｘ−一でこ
の場合ＧＷＧ！２は上記変位範囲内では一定と考えられ
る。In this case, GWG is the total displacement d-△X-1 due to these two types of displacements x. 2 is considered to be constant within the above displacement range.
△Ｘはｔ−一Δ１覧１０分の数ミリメートルに達しえら
れ、一方ゝ に！２は上述されたと同様に数１０ミ
クロンに限定され、このため焦点は良質に保たれる。△X can reach several tenths of a millimeter between t-Δ1, and on the other hand! 2 is limited to a few tens of microns as mentioned above, so that the focus remains of good quality.
第３図は本発明による反射屈折光学的読取装置の光学的
部分を示す。FIG. 3 shows the optical part of a catadioptric optical reader according to the invention.
読取用光ビーム１は、光分割板２０、収束レンズ２１．
入射輻反射線を反射して再び上記収率レンズ２１および
光分割板２０を通過せしめる軽量の鏡２２、および上記
光分割板よりなる光学装置によりデータ担体６に支持さ
れるトラツク７上の点０に焦点を結ばせられる。鏡２２
は上記光学系の光軸に治つて小振幅で振動しうるピエゾ
電気要素２４に取付けられる。上記ピエゾ電気要素、レ
ンズ２１、分割板２０、および対物レンズ２３の支持体
は１個の枠２５に組立てられ、この枠２５は例えば第１
図に示されたような電気力学的装置により上記鏡２２に
よる反射光の光軸と平行に低周波数で変位しうるような
されている。The reading light beam 1 is transmitted through a light splitting plate 20, a converging lens 21 .
Point 0 on the track 7 supported on the data carrier 6 by an optical device consisting of a lightweight mirror 22 which reflects the reflected incident radiation and passes it again through the yield lens 21 and the light splitting plate 20, and the light splitting plate. can be focused on. Mirror 22
is attached to a piezoelectric element 24 which is aligned with the optical axis of the optical system and is capable of vibrating with a small amplitude. The piezoelectric element, the lens 21, the dividing plate 20, and the support for the objective lens 23 are assembled into one frame 25, and this frame 25 is, for example, a first
An electrodynamic device as shown in the figure allows the light reflected by the mirror 22 to be displaced at low frequencies parallel to the optical axis.
この枠２５の変位△Ｘは焦点０を同じく△Ｘだけ変位さ
せる。The displacement ΔX of this frame 25 also displaces the focal point 0 by ΔX.
一方平面鏡あるいは球面鏡であつてもよい上記鏡２２の
変位△Ｘ！は焦点０を、レンズ２１および２３の焦点距
離の関係として定められる一定距離だけ変位せしめる。
換言すれば上記鏡の変位は、この鏡上の点で表わされる
仮想物体の上記２つのレンズに対する変位に相当し、こ
の変位はＫ△Ｘｌに等しい（ここでＫは上記２レンズの
焦点距離の関数である１定数である）。従つて上記２種
の変位の結果としてえられる焦点０の変位は△Ｘ＋Ｋ△
Ｘ１で示される。第４図において本発明による光学的読
取装置のさらに他の変形の光学部分が示されており、こ
の場合上記焦点の高周波数変位はこの光学装置の屈折光
学的要素の収束性を変化せしめることにより行われる。On the other hand, the displacement △X! of the mirror 22, which may be a plane mirror or a spherical mirror! causes focal point 0 to be displaced by a fixed distance determined as the relationship between the focal lengths of lenses 21 and 23.
In other words, the displacement of the mirror corresponds to the displacement of the virtual object represented by the point on the mirror with respect to the two lenses, and this displacement is equal to K△Xl (where K is the focal length of the two lenses). (one constant that is a function). Therefore, the displacement of focal point 0 obtained as a result of the above two types of displacement is △X+K△
It is indicated by X1. In FIG. 4, the optical part of a further variant of the optical reading device according to the invention is shown, in which the high-frequency displacement of the focal point is achieved by changing the convergence of the refractive optical elements of the optical device. It will be done.
光ビーム１は２つのレンズ２６，２７と低周波数で変位
せしめられる読取用対物レンズ２８とにより担体６によ
り支持されるトラツク上の点０に焦点を結ばしめられる
。The light beam 1 is focused by two lenses 26, 27 and a reading objective 28 which is displaced at low frequency onto a point 0 on a track supported by the carrier 6.
上記２個のレンズ２６，２７は読取ビームの直径が小さ
い領域中に配置され、それらの間隔ｅはレンズ２７に取
付けられた環状のピエゾ電気要素２９によつて変化され
る。このピエゾ電気要素は焦点誤差信号中の高周波電気
信号により励振される。対物レンズ２８の拡大率が大き
いため、この対物レンズ２８の低周波数変位は上記焦点
をこれとほぼ同様に変位せしめる。２個のレンズ２６，
２７間の間隔の変化△ｅは上記読取用対物レンズ２８に
対する仮想の物***置を変位せしめその系の焦点位置を
△Ｘ１だけ変位させる。The two lenses 26, 27 are arranged in the region of small diameter of the reading beam, and the distance e between them is varied by an annular piezoelectric element 29 attached to the lens 27. This piezoelectric element is excited by a high frequency electrical signal in the focus error signal. Because of the large magnification of objective lens 28, low frequency displacement of objective lens 28 causes the focal point to be displaced in substantially the same way. two lenses 26,
The change Δe in the distance between the reading objective lenses 27 and 27 displaces the virtual object position with respect to the reading objective lens 28, thereby displacing the focal position of the system by ΔX1.
光ビームは比較的小さな角でこの対物レンズ２８上に入
射するにはその軸方向拡大率ｐ←］→２は大きく、従つ
て２個のレンズ間の間隔ｅの僅かの変化は、上記対物レ
ンズ２８上に入射するビームの発生源をなす仮想物***
置を大幅に変化させる。For the light beam to be incident on this objective lens 28 at a relatively small angle, its axial magnification p←]→2 is large, so that a slight change in the spacing e between the two lenses The position of the virtual object that is the source of the beam incident on 28 is significantly changed.
このため焦点位置の変位△Ｘ！ も認めうる程度となる
。本発明は上述された実施例に限定されるものではなく
、上記軽量の要素を変位せしめる高周波数の駆動は上記
のピエゾ電気要素の代りに小型の高速電気力学装置を用
いて達成できる。Therefore, the displacement of the focal position △X! It is also acceptable. The invention is not limited to the embodiments described above; the high-frequency actuation for displacing the lightweight elements can be achieved using compact high-speed electrodynamic devices instead of the piezoelectric elements described above.
さらに緩やかに変位し、かつ速やかに変位し、あるいは
急速変位しうる光学要素がそれに追加された光学要素を
もつた任意の光学的読取ヘツドを本発明による制御され
た可変焦点光学的読取装置中の光学装置として使用しう
ることは明らかである。Furthermore, any optical reading head having a slowly displacing and rapidly displacing optical element or an optical element that can be rapidly displaced may be used in a controlled variable focus optical reading device according to the present invention. It is clear that it can be used as an optical device.
最後に上述された光学的読取装置ぱ光の透過により読取
られるデータ担体の読取に用いられたが、本発明はこれ
らの実施例に限定されることなく、光の反射により読取
られる型のデータ担体の読取りにも用いられることは明
らかである。Finally, although the optical reading device described above was used for reading data carriers which are read by the transmission of light, the invention is not limited to these embodiments, but the present invention is not limited to these embodiments, but also applies to data carriers of the type which are read by reflection of light. It is clear that it can also be used to read .
第１図は本発明による光学的読取装置の一例を示す系統
図、第２図ないし第４図は本発明による光学的読取装置
中に含まれる光学的読取ヘツドの種々の実施例を示す系
統図である。
１・・・・・・光ビーム、２・・・・・・鏡、３・・・
・・・ピエゾ電気要素、４・・・・・・鏡、５・・・・
・・支持具、６・・・・・・担体、７・・・トラツク、
８，９・・・・・・光電検知器、１０・・・・・・比較
器、１１，１２・・・・・・沢波器、１３・・・・・・
コイル、１４，１５，１６・・・・・・レンズ、１７・
・・・・・メニスカス、１８・・・・・・枠、１９・・
・・・・ピエゾ電気要素、２０・・・・・・分割板、２
１・・・・・・レンズ、２２・・・・・・鏡、２３・・
・・・・対物レンズ、２４・・・・・・ピエゾ電気要素
、２５・・・・・・枠、２６，２７・・・・・・レンズ
、２８・・・・・・対物レンズ、２９・・・・・・ピエ
ゾ電気要素。FIG. 1 is a system diagram showing an example of an optical reading device according to the invention, and FIGS. 2 to 4 are system diagrams showing various embodiments of optical reading heads included in the optical reading device according to the invention. It is. 1...Light beam, 2...Mirror, 3...
...Piezoelectric element, 4...Mirror, 5...
...Support, 6...Carrier, 7...Truck,
8, 9...Photoelectric detector, 10...Comparator, 11,12...Sawa wave detector, 13...
Coil, 14, 15, 16... Lens, 17.
・・・Meniscus, 18... Frame, 19...
... Piezoelectric element, 20 ... Division plate, 2
1...Lens, 22...Mirror, 23...
...Objective lens, 24 ... Piezoelectric element, 25 ... Frame, 26, 27 ... Lens, 28 ... Objective lens, 29. ...Piezoelectric element.
Claims (1)
１および第２の光学要素よりなる光学的読取ヘッドを含
み、上記光学的読取ヘッドは読取用輻射線を可動データ
担体上のデータトラック上に投射し、かつこの輻射線を
上記第１および第２の光学要素の変位により変位せしめ
られる点に焦点を結ばしめるに適しており、さらに上記
可動データ担体から送出される読取用輻射線を検知して
上記焦点と上記トラック間の距離を表わす誤差信号を与
えるに適した検知装置と、上記誤差信号を受けてある制
限周波数よりも低い周波数と高い周波数とをそれぞれ有
する第１および第２の制御信号を供給するフィルタ装置
と、上記第１および第２の制御信号をそれぞれ受けて上
記第１および第２の光学要素の上記変位を制御するに適
した第１および第２の変位装置とを含み、上記可動デー
タ担体により担持されるトラックに沿つて記録されたデ
ータを読取る光学的読取装置。 ２ 上記第１の光学要素が上記光学的読取ヘッド自体で
あり、上記第２の光学要素が上記光学的読取ヘッドの軽
量な構成成分をなす特許請求の範囲第１項記載の光学的
読取装置。 ３ 上記第１の光学要素がその構成部分中単独に変位で
きるようになされ、上記第２の光学要素を構成するもの
を除いて上記光学的読取ヘッド自体を構成する特許請求
の範囲第１項記載の光学的読取装置。 ４ 上記第１および第２の変位装置が電気力学装置であ
る特許請求の範囲第１項記載の光学的読取装置。 ５ 上記第１の変位装置が電気力学装置であり、上記第
２の変位装置が上記第２の光学要素の変位を生じるため
上記第２の光学要素に固定されたピエゾ電気要素である
特許請求の範囲第１項記載の光学的読取装置。 ６ 上記フィルタ装置が上記制限周波数に等しい共通の
遮断周波数をもつた２個のフィルタよりなり、その一方
は低域フィルタで上記第１の制御信号を上記第１の変位
装置に供給し、その他方は上記制限周波数よりも高い周
波数を通過せしめるフィルタで上記第２の制御信号を上
記第２の変位装置に供給するようなされた特許請求の範
囲第５項記載の光学的読取装置。 ７ 上記可動データ担体は透過により読取るに適してお
り、上記検知装置が上記可動データ担体を透過した輻射
線を検知するようなされた特許請求の範囲第６項記載の
光学的読取装置。 ８ 上記可動データ担体が反射により読取るに適してお
り、上記検知装置が上記可動データ担体から反射される
輻射線を検知するようなされた特許請求の範囲第６項記
載の光学的読取装置。Claims: 1. An optical reading head comprising first and second optical elements having a common optical axis and displaceable along the optical axis, the optical reading head having a reading radiation. suitable for projecting a radiation onto a data track on a movable data carrier and focusing this radiation at a point displaced by the displacement of said first and second optical elements; a detection device suitable for detecting the reading radiation emitted by the sensor and providing an error signal indicative of the distance between the focal point and the track; a filter device adapted to receive the first and second control signals, respectively, and to control the displacement of the first and second optical elements; 1 and a second displacement device for reading data recorded along a track carried by said movable data carrier. 2. An optical reading device according to claim 1, wherein the first optical element is the optical reading head itself and the second optical element forms a lightweight component of the optical reading head. 3. Claim 1, wherein the first optical element is independently displaceable in its constituent parts and constitutes the optical reading head itself apart from what constitutes the second optical element. optical reader. 4. An optical reading device according to claim 1, wherein the first and second displacement devices are electrodynamic devices. 5. The first displacement device is an electrodynamic device and the second displacement device is a piezoelectric element fixed to the second optical element for producing a displacement of the second optical element. The optical reading device according to scope 1. 6. The filter device comprises two filters with a common cut-off frequency equal to the limiting frequency, one of which is a low-pass filter and supplies the first control signal to the first displacement device, the other of which is a low-pass filter; 6. The optical reading device according to claim 5, wherein said second control signal is supplied to said second displacement device by a filter that allows frequencies higher than said limit frequency to pass. 7. Optical reading device according to claim 6, wherein the movable data carrier is suitable for reading by transmission and the detection device is adapted to detect radiation transmitted through the movable data carrier. 8. Optical reading device according to claim 6, wherein the movable data carrier is suitable for reading by reflection and the sensing device is adapted to detect radiation reflected from the movable data carrier.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7513620A FR2309888A1 (en) | 1975-04-30 | 1975-04-30 | OPTICAL PROJECTION DEVICE AND OPTICAL READER INCLUDING SUCH A DEVICE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS51134604A JPS51134604A (en) | 1976-11-22 |
| JPS5931776B2 true JPS5931776B2 (en) | 1984-08-04 |
Family
ID=9154695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51047616A Expired JPS5931776B2 (en) | 1975-04-30 | 1976-04-26 | optical reader |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5931776B2 (en) |
| CA (1) | CA1071330A (en) |
| DE (1) | DE2619232A1 (en) |
| FR (1) | FR2309888A1 (en) |
| GB (1) | GB1541596A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62163978U (en) * | 1986-04-08 | 1987-10-17 |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4302830A (en) * | 1978-05-10 | 1981-11-24 | Olympus Optical Company Ltd. | Optical information reading-out apparatus |
| NL8003729A (en) * | 1980-06-27 | 1982-01-18 | Philips Nv | DEVICE FOR OPTICAL FOCUSING. |
| NL8004969A (en) * | 1980-09-02 | 1982-04-01 | Philips Nv | DEVICE FOR OPTICAL FOCUSING. |
| DE3039425A1 (en) * | 1980-10-18 | 1982-05-19 | Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar | DEVICE FOR PHOTOELECTRICALLY DETERMINING THE POSITION OF AT LEAST ONE FOCUS OF AN IMAGE |
| JPS59168835U (en) * | 1983-04-27 | 1984-11-12 | パイオニア株式会社 | Optical recording information reading device |
| JPS6022743A (en) * | 1984-04-24 | 1985-02-05 | Olympus Optical Co Ltd | Pickup for disk reproducer containing information recorded optically |
| DE3544771A1 (en) * | 1985-12-18 | 1987-06-19 | Messerschmitt Boelkow Blohm | Method and device for imaging an object on a detector having radiation-sensitive regions separated from one another by dead spaces |
| US4835380A (en) * | 1987-06-11 | 1989-05-30 | U. S. Philips Corporation | Scanning device for an optical recording and/or reproducing apparatus |
| JP2676371B2 (en) * | 1988-07-04 | 1997-11-12 | パイオニア株式会社 | Pickup height adjuster |
| NL8803055A (en) * | 1988-12-13 | 1990-07-02 | Philips Nv | OPTICAL SCANNER, MIRROR-LIKE SUITABLE FOR APPLICATION THEREIN, AND OPTICAL REGISTER AND / OR READER EQUIPPED WITH THIS SCANNER. |
| NL8803048A (en) * | 1988-12-13 | 1990-07-02 | Philips Nv | OPTICAL SCANNING DEVICE, MIRROR-LIKE SUITABLE FOR USE THEREIN, AND OPTICAL ENTRY AND / OR READING EQUIPMENT PROVIDED WITH THE SCANNING DEVICE. |
| DE4213556C2 (en) * | 1992-04-24 | 1994-04-28 | Max Planck Gesellschaft | Device for the optical scanning of a record carrier, in particular a phosphor storage disk |
| CN109782962A (en) * | 2018-12-11 | 2019-05-21 | 中国科学院深圳先进技术研究院 | A kind of projection interactive method, device, system and terminal device |
-
1975
- 1975-04-30 FR FR7513620A patent/FR2309888A1/en active Granted
-
1976
- 1976-04-26 JP JP51047616A patent/JPS5931776B2/en not_active Expired
- 1976-04-27 GB GB1711576A patent/GB1541596A/en not_active Expired
- 1976-04-29 CA CA251,476A patent/CA1071330A/en not_active Expired
- 1976-04-30 DE DE19762619232 patent/DE2619232A1/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62163978U (en) * | 1986-04-08 | 1987-10-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2619232A1 (en) | 1976-11-11 |
| CA1071330A (en) | 1980-02-05 |
| FR2309888B1 (en) | 1977-11-10 |
| GB1541596A (en) | 1979-03-07 |
| JPS51134604A (en) | 1976-11-22 |
| FR2309888A1 (en) | 1976-11-26 |
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