JPS5849851B2 - Sosa Senhenkan Houshiki - Google Patents
Sosa Senhenkan HoushikiInfo
- Publication number
- JPS5849851B2 JPS5849851B2 JP48047466A JP4746673A JPS5849851B2 JP S5849851 B2 JPS5849851 B2 JP S5849851B2 JP 48047466 A JP48047466 A JP 48047466A JP 4746673 A JP4746673 A JP 4746673A JP S5849851 B2 JPS5849851 B2 JP S5849851B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- scanning
- deflection angle
- angle correction
- receiving surface
- 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
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- Mechanical Optical Scanning Systems (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Holo Graphy (AREA)
Description
【発明の詳細な説明】
レーザー光線の如き単色光線を変調および走査せしめて
画像を形成し、前記画像を投影してデイスプレイする装
置や感光材料に照射して記録する装置が開発されている
。DETAILED DESCRIPTION OF THE INVENTION Devices have been developed that modulate and scan a monochromatic light beam such as a laser beam to form an image, project the image for display, and record the image by irradiating it onto a photosensitive material.
単色光線を直線走査せしめる方法として電気光学効果を
用いるもの、音響光学効果を用いるもの、回転多面体鏡
を用いるものおよびガルバノメーターの如き電磁式振動
鏡を用いるものなどが考えられているが、回転多面体鏡
を用いるもの以外は未だ実用になり難《、画像形成の偏
向器として回転多面体鏡を用いるものも光偏向角が一般
に大きいので等速走査を行なわしめようとすると高価な
レンズ系が必要になったりする。Methods of linearly scanning a monochromatic light beam include methods using electro-optic effects, methods using acousto-optic effects, methods using rotating polyhedral mirrors, and methods using electromagnetic vibrating mirrors such as galvanometers. It is still difficult to put anything other than mirrors into practical use (although those that use a rotating polygon mirror as a deflector for image formation generally have a large optical deflection angle, so if you want to perform constant-velocity scanning, you will need an expensive lens system. or
電気光学効果や音響光学効果を利用する光偏向器は高価
であるばかりでなく光偏向角が大きく取りにくい欠点も
あり、特に高速度の走査を要求される場合には光点分解
能が低下するという問題が生じてくる。Optical deflectors that utilize the electro-optic effect or acousto-optic effect are not only expensive, but also have the disadvantage that it is difficult to obtain a large optical deflection angle, and particularly when high-speed scanning is required, the light spot resolution decreases. Problems arise.
またガルバノメーターの如き電磁式振動鏡を用いるもの
は安価に入手できるが、高速度の走査が要求される場合
にきわめて微小な振動鏡が必要となったり、多数の振動
鏡が必要になったりして実用性に欠ける。Furthermore, galvanometers that use electromagnetic vibrating mirrors are available at low cost, but when high-speed scanning is required, extremely small vibrating mirrors or a large number of vibrating mirrors are required. It lacks practicality.
これまでに述べた光偏向器のさらに大きな欠点は、光偏
向器の駆動電源としてのこぎり波電圧または三角波電圧
または位相変調電圧などを発生せしめる装置を使用する
必要があるので、広帯域特性が重要となり、複雑なこと
である。An even bigger drawback of the optical deflectors mentioned above is that it is necessary to use a device that generates a sawtooth wave voltage, a triangular wave voltage, or a phase modulation voltage as a driving power source for the optical deflector, so broadband characteristics are important. It's complicated.
本発明は、光偏向素子により円走査を行なわしめるよう
に偏向作用を受けた単色光線を、三光束式ホログラム作
成法によって作られ、入射する円走査光の回折光を直線
走査するように偏向させる偏向角補正用ホログラム板を
通して受光面に指向せしめ、その回折光を受光面上で等
速直線走査せしめることを特徴とする走査線変換方式を
提供するものである。In the present invention, a monochromatic light beam is deflected to perform circular scanning by an optical deflection element, and is created by a three-beam hologram creation method, and the diffracted light of the incident circular scanning light is deflected to perform linear scanning. The present invention provides a scanning line conversion system characterized in that the diffracted light is directed to a light receiving surface through a hologram plate for correcting the deflection angle, and the diffracted light is linearly scanned at a constant speed on the light receiving surface.
本発明において円走査を行なわしめる方法としては、通
常の電動機の軸を斜めに切り落として鏡面となしたもの
あるいは通常の電動機の軸に多面プリズムを取り付けた
ものでよく、正弦波交流電圧によって駆動されることが
可能であり、高性能でしかも安価に実現できる。In the present invention, circular scanning may be performed by cutting off the shaft of an ordinary electric motor diagonally to create a mirror surface, or by attaching a multifaceted prism to the axis of an ordinary electric motor, which is driven by a sinusoidal AC voltage. It is possible to achieve high performance and low cost.
さらに円走査を行なわしめる別の方法としては電気光学
効果あるいは音響光学効果を利用した光偏向器あるいは
電磁共振式振動鏡の如き光偏向器を2個用いて円形のり
サージュ図形を描くように一段目の光偏向器と二段目の
光偏向器に、振幅と周波数は等しく位相が90°異なる
電圧をそれぞれ加えて円走査を行なわしめるものでもよ
く、さらにピエゾ物質に細い軸を取り付けその軸の先端
に小さい鏡を設けて電圧によって皿まわし運動を行なわ
しめるようにして円走査を行なわしめるものでもよいこ
とはもちろんである。Another method for performing circular scanning is to use two optical deflectors such as electro-optic or acousto-optic effects or electromagnetic resonant vibrating mirrors to create a circular beam pattern in the first stage. It is also possible to perform circular scanning by applying voltages with the same amplitude and frequency and a phase difference of 90° to the optical deflector of the first stage and the second stage optical deflector, respectively.Furthermore, a thin shaft is attached to the piezo material and a thin shaft is attached to the tip of the shaft. It goes without saying that circular scanning may be performed by providing a small mirror in the mirror and rotating the plate by applying a voltage.
本発明において使用する単色光線は、レーザー光源から
発する単色光線、あるいは白熱電球、放電灯および発光
ダイオードなどの比較的発光スペクトルの広い光源に狭
帯域の光学フィルターを装着して単色とした光源からの
光線をいう。The monochromatic light used in the present invention is the monochromatic light emitted from a laser light source, or the light source made monochromatic by attaching a narrow band optical filter to a light source with a relatively wide emission spectrum, such as an incandescent bulb, discharge lamp, or light emitting diode. A ray of light.
二光束式ホログラム作成法を用いて作られた偏向角補正
板と(も互いにある有限の角度をなした2本の光束の干
渉像を記録したホログラム、あるいはこれと等価な干渉
像を電子計算機によって計算せしめ、その出力をプロッ
トさせたものを写真撮影によって縮小したいわゆる計算
機ボログラムであって、円走査するように偏向された前
記単色光線束の偏向角を補正して受光面で等速直線走査
を行なわしめるものをいう。A deflection angle correction plate made using the two-beam hologram creation method (also known as a hologram that records the interference image of two beams that form a finite angle with each other, or an equivalent interference image that is created using an electronic computer) This is a so-called computer-generated bologram, which is a computer-generated bologram in which the output is plotted and scaled down by photography, and the deflection angle of the monochromatic light beam, which is deflected in a circular manner, is corrected to cause a constant-velocity linear scan on the light-receiving surface. Refers to something that is done.
受光面は、一例として画像を投影してディスフレイする
装置に本発明を応用する際にはスクリーンの置かれるべ
き面を指し、また別の例として感光材料に照射して記録
する装置に本発明を応用する際には感光材料の置かれる
べき面を指し、さらに別の例として飛点走査装置に本発
明を応用する際には読み取られるべき原稿の置かれるべ
き面を指す。For example, the light-receiving surface refers to the surface on which a screen is placed when the present invention is applied to a device that projects and displays an image, and as another example, the light-receiving surface refers to the surface on which a screen is placed when the present invention is applied to a device that projects and displays an image. When the present invention is applied to a flying spot scanning device, it refers to the surface on which a photosensitive material is placed, and as another example, when the present invention is applied to a flying spot scanning device, it refers to the surface on which a document to be read is placed.
さらに受光面における画像を拡大または縮小するときに
用いられるレンズ系の置かれるべき位置を示す場合もあ
ることはいうまでもない。It goes without saying that it may also indicate the position of a lens system used to enlarge or reduce an image on the light receiving surface.
本発明の目的は高性能に実現することのできる円走査偏
向器を利用して等速直線走査を実現する方法を提供する
ことにある。An object of the present invention is to provide a method for realizing uniform linear scanning using a circular scanning deflector that can be realized with high performance.
本発明の別の目的は、安価に簡単な装置で実現すること
のできる円走査偏向器を利用して等速直線走査を実現す
る方法を提供することにある。Another object of the present invention is to provide a method for realizing uniform linear scanning using a circular scanning deflector that can be realized at low cost and with a simple device.
本発明のさらに別の目的は等速直線走査が行なわれるべ
き画面の大きさを容易に望みの大きさにする方法を提供
することにある。Still another object of the present invention is to provide a method for easily adjusting the size of the screen on which uniform linear scanning is to be performed to a desired size.
以下図面に従って本発明の説明を行なう。The present invention will be explained below with reference to the drawings.
第1図は磁気テープに貯えられた画像情報を感光材料上
に記録するシステムに本発明を応用した一例を示す図で
ある。FIG. 1 is a diagram showing an example in which the present invention is applied to a system for recording image information stored on a magnetic tape onto a photosensitive material.
第1図においてレーザー光源1がら発した光線束2は光
変調電源3によって与えられる映像信号によって動作す
る光変調器4で輝度変調され逆望遠レンズ系5に入射す
る。In FIG. 1, a beam 2 emitted from a laser light source 1 is intensity-modulated by a light modulator 4 operated by a video signal provided by a light modulation power source 3, and enters an inverted telephoto lens system 5.
一方、正弦状交流電圧発生器6によって駆動される電動
機7の軸を斜めに切り落として鏡面となされた光偏向素
子8は、前記逆望遠レンズ系5によって光束系を小さく
補正され反射鏡9及び10によって前記電動機Iの回転
軸の方向にそって指向された平行なレーザー光線束11
を、偏向角補正液120面において円走査せしめる。On the other hand, the optical deflection element 8, which is made into a mirror surface by obliquely cutting off the axis of the electric motor 7 driven by the sinusoidal AC voltage generator 6, has its light beam system corrected to a small value by the inverse telephoto lens system 5, and the reflecting mirrors 9 and 10 parallel laser beam bundle 11 directed along the direction of the rotation axis of the electric motor I by
is circularly scanned on the surface of the deflection angle correction liquid 120.
偏向角補正板12を通過した光線束13は感光材料14
の面において収束されると同時に感光材料140面上に
おげる一走査期中の各走査点の飛点走査速度が互に等速
でその走査線は直線となっている。The light beam 13 that has passed through the deflection angle correction plate 12 is transferred to the photosensitive material 14
At the same time, the scanning speed of each scanning point during one scanning period on the surface of the photosensitive material 140 is constant, and the scanning line is a straight line.
また偏向角補正板12はすでに説明した如く三光束式ホ
ログラム作成技術によって作られたものであるから、偏
向角補正板12を通過した光線束は画像情報を感光材料
上に記録するために必要な光線束13のほかに、いわゆ
る零次回折光線束15をも発生するため、遮光板16を
偏向角補正板12と感光材料14の間に置く必要がある
。In addition, since the deflection angle correction plate 12 is made by the three-beam hologram creation technology as described above, the beam of light passing through the deflection angle correction plate 12 is used for recording image information on the photosensitive material. In addition to the beam 13, a so-called zero-order diffracted beam 15 is also generated, so it is necessary to place a light shielding plate 16 between the deflection angle correction plate 12 and the photosensitive material 14.
第1図に示した記録システムは磁気テープ装置17から
発する影像信号が光変調電源3に与えられ、磁気テープ
装置17から発する水平同期信号が正弦状交流電圧発生
器6に与えられ、且つ同期電動機18で感光材料14が
光線束13の走査方向とほg直角に移動せしめられるこ
とで、感光材料14上に画像記録することができる。In the recording system shown in FIG. 1, an image signal generated from a magnetic tape device 17 is applied to an optical modulation power source 3, a horizontal synchronization signal generated from the magnetic tape device 17 is applied to a sinusoidal AC voltage generator 6, and a synchronous motor At step 18, the photosensitive material 14 is moved perpendicular to the scanning direction of the light beam 13, so that an image can be recorded on the photosensitive material 14.
なお電動機7としてパルスモーターを用いるときは正弦
状交流電圧発生器6の代りに、パルス電源を用いればよ
いことはいうまでもない。It goes without saying that when a pulse motor is used as the electric motor 7, a pulse power source may be used instead of the sinusoidal AC voltage generator 6.
さらに画像情報を感光材料14の上に記録するのには不
要な光線束15を光検出器19で検出し、磁気テープ装
置17の動作を制御することも可能である。Furthermore, it is also possible to detect the light beam 15 unnecessary for recording image information on the photosensitive material 14 with the photodetector 19 and to control the operation of the magnetic tape device 17.
第2図は第1図に示した光偏向素子8による円走査の態
様を説明するための図である。FIG. 2 is a diagram for explaining a mode of circular scanning by the optical deflection element 8 shown in FIG. 1.
第2図aは斜祝図、同bは側面図である。Figure 2a is a perspective view, and Figure 2b is a side view.
小さい光束径をもつ光線束11が電動機の回転軸の中心
線20にそって光偏向素子8に指向される。A beam 11 having a small beam diameter is directed toward the optical deflection element 8 along the center line 20 of the rotating shaft of the motor.
電動機の軸がθの角角で切りおとされその面を鏡面とな
しておけば、光線束11は2θの角度だけ偏向されて光
線束21となり、電動機の軸の回転に従ってこの軸に垂
直におかれる偏向角補正板120面で円走査を行なう。If the shaft of the motor is cut at an angle of θ and its surface is made a mirror surface, the beam of light 11 will be deflected by an angle of 2θ to become a beam of light 21, and as the shaft of the motor rotates, it will become a beam of light perpendicular to this axis. Circular scanning is performed on the surface of the deflection angle correction plate 120 placed thereon.
この円走査の半径rは、鏡面が回転軸の中心線20と交
わる点22と偏向角補正板12との間の距離をlとすれ
ばr−l−tan(2θ]である。The radius r of this circular scan is r-l-tan (2θ), where l is the distance between the point 22 where the mirror surface intersects the center line 20 of the rotation axis and the deflection angle correction plate 12.
第2図に説明した通常の電動機の軸を斜めに切り落して
鏡面となした円走査偏向器は構造が簡単であり、従って
製造が容易で高精度のものが得やすい。The circular scanning deflector shown in FIG. 2, in which the shaft of an ordinary electric motor is cut off diagonally to form a mirror surface, has a simple structure, and is therefore easy to manufacture and can easily be manufactured with high precision.
鏡面をつくる方法としてはその面を光学研摩してもよい
し、さらに通常の反射鏡の如くにアルミニウムやクロム
の薄膜を蒸着によって装着せしめてもよい。The mirror surface may be created by optically polishing the surface, or by attaching a thin film of aluminum or chromium by vapor deposition as in a normal reflecting mirror.
しかし、円形走査を行なう光偏向素子としては第2図に
説明したものに限定されることはない。However, the optical deflection element for performing circular scanning is not limited to that described in FIG. 2.
たとえば第3図および第4図に示される如きものがその
例である。For example, those shown in FIGS. 3 and 4 are examples.
第3図は電動機の軸8を垂直に切り落して鏡面23をつ
くり、その上に面24をもったプリズム25を装着した
ものである。In FIG. 3, the shaft 8 of the electric motor is vertically cut off to create a mirror surface 23, and a prism 25 having a surface 24 is mounted on the mirror surface 23.
第3図aは斜視図、同bは側面図である。FIG. 3a is a perspective view, and FIG. 3b is a side view.
電動機の回転軸の中心線20にそって指向された光線束
11はプリズムの面24で屈折し、鏡面23で反射され
た後再びプリズムの面24で屈折し偏向された光線束2
1となる。A bundle of rays 11 directed along the center line 20 of the rotation axis of the electric motor is refracted by a surface 24 of the prism, reflected by a mirror surface 23, and then refracted again by the surface 24 of the prism, resulting in a deflected bundle of rays 2.
It becomes 1.
この光線束21は電動機の軸の回転に従ってこの軸に垂
直に置かれる偏向角補正板12の面で円走査を行なう。As the shaft of the electric motor rotates, this beam of light 21 performs circular scanning on the surface of the deflection angle correction plate 12 placed perpendicular to this shaft.
第4図は電動機の軸8に歯車26を装着し、歯車26と
かみ合う別の歯車27の中央をくりぬいてここにプリズ
ム28を装着したものである。In FIG. 4, a gear 26 is mounted on the shaft 8 of an electric motor, and another gear 27 meshing with the gear 26 is hollowed out in the center and a prism 28 is mounted therein.
同aは斜視図、同bは側面図である。FIG. 1A is a perspective view, and FIG. 1B is a side view.
プリズムの回転軸29に沿って指向された光線束11は
プリズムによって屈折し、偏向された光線束21となる
。A bundle of rays 11 directed along the axis of rotation 29 of the prism is refracted by the prism and becomes a bundle of deflected rays 21 .
この光線束21は電動機の軸の回転に従い、プリズムの
回転軸29に垂直に置かれた偏向角補正板12の面で円
走査を行なう。This light beam 21 performs circular scanning on the surface of the deflection angle correction plate 12 placed perpendicularly to the rotation axis 29 of the prism as the axis of the electric motor rotates.
この場合には光線束11の偏向角補正板を透過した光が
円走査することはもちろんである。In this case, it goes without saying that the light that has passed through the deflection angle correction plate of the light beam 11 performs circular scanning.
第4図に説明した円走査偏向素子は、歯車26の歯数を
N1、歯車27の歯数をN2 としたときNt/N2
の比で電動機の回転速度を変換して円走査を行わしめる
ことができ、高速走査が容易になるという利点をもつ。The circular scanning deflection element explained in FIG.
Circular scanning can be performed by converting the rotational speed of the electric motor at the ratio of , which has the advantage of facilitating high-speed scanning.
円形走査を行なう光偏向素子として第2図ないし第4図
によって説明したものはいずれも構造が簡単で、また製
造が容易であり、従って高精度のものが得やすい。All of the optical deflection elements for performing circular scanning described with reference to FIGS. 2 to 4 have a simple structure and are easy to manufacture, so it is easy to obtain highly accurate ones.
しかしさらに円走査を行なわしめる別の方法としては電
気光学効果あるいは音響光学効果を利用した光偏向器を
2個用いて円形のりサージュ図形を描くように一段目の
光偏向器と二段目の光偏向器に、振幅と周波数が等しく
位相が900異なる電圧をそれぞれ加えて円走査を行な
わしめるものでもよく、さらにピエゾ物質に細い軸を取
り付け、その軸の先端に小さい鏡を設けて電圧によって
皿まわし運動を行なわしめるようにして円走査を行なわ
しめるものでもよい。However, another method for further circular scanning is to use two optical deflectors that utilize the electro-optic effect or the acousto-optic effect, so that the first-stage optical deflector and the second-stage optical It is also possible to perform circular scanning by applying voltages with the same amplitude and frequency and a phase difference of 900 degrees to the deflector.Furthermore, a thin shaft is attached to the piezo material, and a small mirror is attached to the tip of the shaft, so that the voltage causes a countersunk movement. It may also be possible to perform circular scanning by performing .
第5図は第1図における偏向角補正板12に要求される
偏向角補正の態様を説明する図である。FIG. 5 is a diagram illustrating a mode of deflection angle correction required of the deflection angle correction plate 12 in FIG. 1.
点30は微小な光束径をもった光線束が円走査を行なう
際の原点であり、円走査のために第2図に示した光偏向
素子を用いる場合には鏡面と電動機の回転軸の中心線2
0との交点22になる。Point 30 is the origin when a beam of light with a minute beam diameter performs circular scanning, and when using the optical deflection element shown in Figure 2 for circular scanning, the point 30 is the origin of the mirror surface and the center of the rotation axis of the electric motor. line 2
It becomes the intersection point 22 with 0.
偏向角補正板120面において走査により光点がたどる
円31を2N個に分割し、その分割点をAH 2A2
,A3 ,・・・・・・,An,・・・・・・AN
,・・・・・・,A2 N −1 ,A2 N とし、
偏向角補正板上のこれら2N個の分割点のまわりの微小
面積に2N個の微小ホログラム(要素ホログラム)が記
録されている。The circle 31 traced by the light spot by scanning on the deflection angle correction plate 120 is divided into 2N parts, and the dividing points are AH 2A2
,A3 ,...,An,...AN
,...,A2 N -1 ,A2 N ,
2N minute holograms (element holograms) are recorded in a minute area around these 2N dividing points on the deflection angle correction plate.
二光束式ホログラム作成法によって作られた微小ホログ
ラムの配列から或る偏向角補正板120面に光線束32
が入射すると、偏向角補正板を透過する光線束は零次回
折光線束15と1次回折光線束13とに分かれる。A beam of light 32 is generated on a certain deflection angle correction plate 120 surface from an array of minute holograms created by a two-beam hologram creation method.
When the beam is incident, the beam of light passing through the deflection angle correction plate is divided into a beam of zero-order diffracted beams 15 and a beam of first-order diffracted beams 13.
偏向角補正板に要求される偏向角補正の態様は、光線束
32が点列Al 2A2,・・・・・・5 An 2
・・・・・・tA2Nを順次に円走査するときに1次回
折光線束13が受光面14上の等速直線走査線を得たい
直線33上のそれぞれ対応する等間隔の点列B1, B
2 ,・・・・・・, Bn ,・・・・・・,B2N
の位置に収束されることである。The mode of deflection angle correction required of the deflection angle correction plate is such that the light beam 32 is a dot array Al 2A2,...5 An 2
When sequentially circularly scanning tA2N, the first-order diffracted light ray bundle 13 forms a corresponding equally spaced point array B1, B on the straight line 33 to obtain a uniform linear scanning line on the light receiving surface 14.
2 ,..., Bn ,..., B2N
It is to be converged at the position of .
このような偏向角補正板は二光束式ホログラム作成技術
によって可能である。Such a deflection angle correction plate is possible using a two-beam hologram creation technique.
一本の走査線の分割点2Nは一本の走査線上で要求され
る分解点の数に対応するので、例えば商用テレビジョン
と同程度の解像度を得ようとすれば2N=700程度に
選ぶ必要がある。The dividing point 2N of one scanning line corresponds to the number of decomposition points required on one scanning line, so if you want to obtain the same resolution as commercial television, for example, you need to select 2N = 700. There is.
二光束式ホログラムから再生される光線束は一般には、
実質上回折をうけない零次回折光線束(第5図において
、受光面14とA’l ,A′2 ,・・・・・・A贅
,・・・・・・t A2 N +]’に交わる)と、±
1次回折光線束、±2次回折光線束、・・・・・・が各
々互に異なる方向に生ずるのであるが、実像を再生した
い場合には再生用照明光線束としてホログラムを記録し
たときに用いた参照光と共役の光線束を用いて+1次の
実像を生せしめる方法が収差を最小にし、また回折光線
束の明るさをも大きくする。The light beam reproduced from a two-beam hologram is generally
A zero-order diffracted ray bundle that undergoes no substantial refraction (in Fig. 5, the light receiving surface 14 and A'l , A'2 , . . . A, . . . t A2 N +]' ) and ±
The 1st-order diffracted ray bundle, the ±2nd-order diffracted ray bundle, etc. are generated in different directions, but if you want to reproduce a real image, when a hologram is recorded as a reproduction illumination ray bundle, The method of producing a +1st-order real image using a beam conjugate to the reference beam used minimizes aberrations and also increases the brightness of the diffracted beam.
この好ましい条件の下で偏向角補正を実現するホログラ
ムの作成は第6図に示すごとき手段によって実現される
。The creation of a hologram that realizes deflection angle correction under these preferable conditions is realized by the means shown in FIG.
第6図において、二光束式ホログラム作成法によって作
られる偏向角補正板12上の第n番目の分割点Anのま
わりの微小面積に記載される微小ホログラムは、使用状
態においては円走査光偏向器8から指向される光線束3
2によって照明され、光線束32の1次回折光線束が受
光面14上の点An’の位置に零次回折光線束を、受光
面上の等速直線走査線を得たい直線上の点Bnの位置に
1次回折光線束を生ずる必要がある。In FIG. 6, the minute hologram written in the minute area around the n-th division point An on the deflection angle correction plate 12, which is created by the two-beam hologram creation method, is a circular scanning optical deflector in use. ray bundle 3 directed from 8
2, the first-order diffracted ray bundle of the ray bundle 32 produces a zero-order diffracted ray bundle at the position An' on the light-receiving surface 14, and a point Bn on the straight line where you want to obtain a constant velocity linear scanning line on the light-receiving surface 14. It is necessary to generate a first-order diffracted ray bundle at the position.
このような回折を生じるためのホログラムは受光面14
上の点An’から偏向角補正板120面上の点Anに指
向される平行光線束15′を参照光とし、受光面14上
の点Bnから偏向角補正板12の面上の点Anに指向さ
れる発散光線束13′を物体光として点Anのまわりの
微小面積にそれらの干渉パターンを記録することをよっ
て作られる。The hologram for causing such diffraction is the light receiving surface 14.
The parallel light beam 15' directed from the upper point An' to the point An on the surface of the deflection angle correction plate 120 is used as a reference beam, and from the point Bn on the light receiving surface 14 to the point An on the surface of the deflection angle correction plate 12. It is created by using the directed divergent light beam 13' as object light and recording their interference pattern in a minute area around the point An.
この過程は偏向角補正板12上の2N個の点列A1 t
A2 )・・・・・・An ,・・・・・・,A2N
のまわりの2N個の微小面積に対して、それぞれA1′
、A2’、・・・・・・、An’ ・・・・・・A2
N’点からの平行光線束とB1、B2、曲・・、Bn、
・・・・・・、B2N点からの発散光線束を指向させ、
干渉ハターンを記録することにより2N回<り返される
。This process consists of a sequence of 2N points A1 t on the deflection angle correction plate 12.
A2)...An,...,A2N
For 2N small areas around A1'
,A2',...,An'...A2
Parallel ray bundle from point N' and B1, B2, curve..., Bn,
・・・・・・Direct the divergent ray bundle from point B2N,
It is repeated 2N times by recording the interference pattern.
さらにまた本発明の基本的概念により、偏向角補正板1
2上での1回の円走査によって受光面14上で複数個の
直線走査線を得ることが可能である。Furthermore, according to the basic concept of the present invention, the deflection angle correction plate 1
It is possible to obtain a plurality of linear scanning lines on the light-receiving surface 14 by one circular scan on the light-receiving surface 14.
第7図は一例として偏向角補正板上での1回の円走査に
より受光面上で2本の直線走査線を得ようとする場合に
要求される偏向角補正の態様を説明するための図である
。FIG. 7 is a diagram for explaining, as an example, the mode of deflection angle correction required when attempting to obtain two straight scanning lines on the light receiving surface by one circular scan on the deflection angle correction plate. It is.
第7図において点3oを原点として偏向角補正板12上
の円31の上を円走査する光線束32は、前記円周31
上の等間隔の2N個の分割点A1A2 ,A3 ,””
” + An 7 ”””AN −1 ,AN +AN
+1 5 AN 一F−2 t AN +s
t ””” t AN + n ,・・
・・・・” 2 N−1t A2 N を順次通過する
。In FIG. 7, the beam 32 circularly scans the circle 31 on the deflection angle correction plate 12 with the point 3o as the origin.
2N equally spaced dividing points A1A2 , A3 ,"" on the top
” + An 7 ”””AN -1 , AN +AN
+1 5 AN -F-2 t AN +s
t ””” t AN + n,...
..." 2 N-1t A2 N are passed in sequence.
これら2N個の分割点のまわりの微小面積にそれぞれ2
N個の微小ホログラム(要素ホログラム)を記録してお
く。Each minute area around these 2N division points has 2
N minute holograms (element holograms) are recorded.
光線束32が前記円周31上のA1A2 + A3 ,
””・・+ An + ”””AN −1 J ANの
N個の点を順次走査する際、Anの点を通過する際の1
次回折光線束35が受光面14上の所定の直線36上の
所定の点Bnに指向されること、及び光線束32が前記
円周31上のAN +1 ,AN +2 2AN−4−
3+−゜“t AN −4− n+−゜゛+ A2 N
] ツA2N のN個の点を順次走査する際、A2
N −1− Hの点を通過する際の1次回折光線束3
7が受光面14土の所定の直線38上の所定の点BN+
nに指向されることが偏向角補正板12に要求される偏
向角補正の態様である。The light beam 32 is A1A2 + A3 on the circumference 31,
""...+ An + """AN -1 J When sequentially scanning N points of AN, 1 when passing the point of An
The second-order diffracted light beam 35 is directed to a predetermined point Bn on a predetermined straight line 36 on the light receiving surface 14, and the light beam 32 is directed to a predetermined point Bn on the circumference 31.
3+-゜"t AN -4- n+-゜゛+ A2 N
] When sequentially scanning N points of A2N,
First-order diffracted ray bundle 3 when passing through the point N -1-H
7 is a predetermined point BN+ on a predetermined straight line 38 on the light receiving surface 14
This is a mode of deflection angle correction that requires the deflection angle correction plate 12 to be directed in the direction n.
この際直線36上のN個の点B1,B2,B3,・・・
・・・,Bn1・・・・・・,BN−1 ,BNおよび
直線38上のN個の点BN +17 BN+22BN
+3 t ””” tBN +n >曲゜゜クB2N−
12B2Nは互に等間隔に位置設定される。At this time, N points B1, B2, B3, . . . on the straight line 36
..., Bn1..., BN-1, BN and N points BN on the straight line 38 BN +17 BN+22BN
+3 t ””” tBN +n > Song゜゜ku B2N-
12B2N are positioned equidistantly from each other.
こうして偏向角補正板12上の円周31に沿う1回の円
走査中に受光面14上では2本の等速直線走査線36及
び38が得られる。In this way, two uniform linear scanning lines 36 and 38 are obtained on the light receiving surface 14 during one circular scan along the circumference 31 on the deflection angle correction plate 12.
この場合、1本の直線走査線上での分解点数はNとなり
、第5図で説明した場合の分解点数2Nの半分になる。In this case, the number of decomposition points on one straight scanning line is N, which is half of the number of decomposition points, 2N, in the case described with reference to FIG.
また特別な場合として第7′図における2本の直線36
及び38を一致させてもよい。In addition, as a special case, the two straight lines 36 in Fig. 7'
and 38 may be matched.
即ち一回の円走査によって二回の直線走査を行わせるこ
ともできる。That is, it is also possible to perform two linear scans with one circular scan.
この場合1回の円走査期間中に2本の直線走査線が同一
場所に生じるので、第1図に示した如きシステムで応用
する際には感光材料14の送り速度を2倍にしてやれば
よい。In this case, two linear scanning lines occur at the same location during one circular scanning period, so when applied to a system such as the one shown in FIG. 1, the feeding speed of the photosensitive material 14 can be doubled. .
以上は1回の円走査期間中に2本の直線走査線を得る場
合を述べたのであるが、もっと多数の3本以上の直線走
査線を得ることも可能であることは明白である。Although the case where two linear scanning lines are obtained during one circular scanning period has been described above, it is obvious that it is also possible to obtain a larger number of linear scanning lines, ie, three or more.
なお第1図、第5図および第7図では受光面14上での
等速直線走査線が零次回折光線束15の受光面14上の
軌跡34の内部に存在する場合を描いてあるが、偏向角
補正板12を二光束式ボログラム作成技術によって記録
する際に点光源列B1, B2 , B3,・・・・・
・7B2Nの位置と間隔を選ぶことにより、直線走査線
を任意の位置に、任意の長さで生せしめることが可能で
あり、従って画面のサイズを任意の大きさにとることも
可能である。Note that FIGS. 1, 5, and 7 depict the case where the constant velocity linear scanning line on the light receiving surface 14 exists within the locus 34 of the zero-order diffracted ray bundle 15 on the light receiving surface 14. , when recording the deflection angle correction plate 12 using the two-beam bologram creation technique, point light source arrays B1, B2, B3, . . .
- By selecting the position and spacing of 7B2N, it is possible to generate a straight scanning line at any position and at any length, and therefore it is also possible to set the screen size to any size.
本発明は、円走査された単色光線の等しい回転角度毎に
要素ホログラムを形威し、この要素ホログラムは受光面
上で直線的に等間隔に光点を結ぶごとく作成されるので
、円周上に配列された要素ホログラム群を等速で円走査
する単色光線は受光面上で等速直線走査をする。In the present invention, an element hologram is formed at each equal rotation angle of a circularly scanned monochromatic light beam, and this element hologram is created by connecting light points at equal intervals in a straight line on the light receiving surface. The monochromatic light beam that circularly scans the element hologram group arranged at a constant speed performs a linear scan at a constant speed on the light-receiving surface.
本発明によれば次に述べるような各種の効果が得られる
。According to the present invention, various effects as described below can be obtained.
まず安価で小型な円走査手段を用いることができるので
、安価で小型な等速直線走査装置を実現することができ
る。First, since an inexpensive and compact circular scanning means can be used, an inexpensive and compact constant velocity linear scanning device can be realized.
円走査手段は等速円運動をする装置を用いればよく、そ
の等速性は高性能であるので、高性能な等速直線走査を
することができる。As the circular scanning means, a device that performs uniform circular motion may be used, and since the uniform velocity is high performance, high performance uniform velocity linear scanning can be performed.
また回転多面鏡を使用しないので面だおれによる走査線
のゆれもなくかつ高価なレンズを使用としない。Furthermore, since a rotating polygonal mirror is not used, there is no fluctuation in the scanning line due to surface sagging, and no expensive lenses are used.
さらに直線走査でありながらデューティ・サイクル(有
効時間率)を100%とすることができて走査の効果を
高めることができる。Furthermore, even though it is a linear scan, the duty cycle (effective time rate) can be set to 100%, thereby increasing the scanning effect.
さらに一回の円走査に対して複数回の直線走査をするこ
とができる。Furthermore, multiple linear scans can be performed for one circular scan.
第1図は本発明の走査線変換方式を応用した記録装置の
概略斜視図、第2図ないし第4図は単色光線を円走査に
偏向させる装置例の斜視図及び側面図、第5図及び第7
図は円走査を直線走査に変換する偏向角補正板の働らき
を説明するための光路の斜祝図、第6図は偏向角補正板
の製作法を説明するための光路の側面図である。
1・・・・・・レーザ光源、2・・・・・・光線束、3
・・・・・・光変調電源、4・・・・・・光変調器、5
・・・・・・レンズ系、6・・・・・・交流電圧発生器
、7・・・・・・電動機、8・・・・・・光偏向素子、
9及び10・・・・・・反射鏡、12・・・・・・偏向
角補正板、13・・・・・・1次回折光線束、14・・
・・・・感光材料、15・・・・・・零次回折光線束、
16・・・・・・遮光板、18・・・・・・モータ。FIG. 1 is a schematic perspective view of a recording apparatus to which the scanning line conversion method of the present invention is applied, FIGS. 7th
The figure is a perspective view of the optical path to explain the function of the deflection angle correction plate that converts circular scanning into linear scanning, and Figure 6 is a side view of the optical path to explain the manufacturing method of the deflection angle correction plate. . 1... Laser light source, 2... Ray flux, 3
. . . Optical modulation power supply, 4 . . . Optical modulator, 5
... Lens system, 6 ... AC voltage generator, 7 ... Electric motor, 8 ... Light deflection element,
9 and 10...Reflecting mirror, 12...Deflection angle correction plate, 13...First-order diffracted ray bundle, 14...
...Photosensitive material, 15...0th order diffraction ray bundle,
16... Light shielding plate, 18... Motor.
Claims (1)
作用を受けた単色光線を、受光面上で等速走査を行なわ
しめるための二光束式ホログラム作成法によって作られ
た偏向角補正用要素ホログラム板に該二光束式ホログラ
ム作成時の参照光と同一な方向から指向せしめ、その回
折光を受光面上で等速直線走査せしめることを特徴とす
る走査線変換方式。1. Elemental hologram plate for deflection angle correction made by a two-beam hologram creation method for uniformly scanning a monochromatic light beam deflected by an optical deflection element so as to perform circular scanning on a light receiving surface. A scanning line conversion method characterized in that the diffracted light is directed from the same direction as the reference light when creating the two-beam hologram, and the diffracted light is caused to linearly scan at a constant speed on the light receiving surface.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48047466A JPS5849851B2 (en) | 1973-04-25 | 1973-04-25 | Sosa Senhenkan Houshiki |
US05/461,328 US3951509A (en) | 1973-04-17 | 1974-04-16 | Apparatus for deflecting light and scanning line conversion system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48047466A JPS5849851B2 (en) | 1973-04-25 | 1973-04-25 | Sosa Senhenkan Houshiki |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS49134343A JPS49134343A (en) | 1974-12-24 |
JPS5849851B2 true JPS5849851B2 (en) | 1983-11-07 |
Family
ID=12775915
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP48047466A Expired JPS5849851B2 (en) | 1973-04-17 | 1973-04-25 | Sosa Senhenkan Houshiki |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5849851B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2532049B2 (en) * | 1983-06-30 | 1996-09-11 | 富士通株式会社 | Optical beam scanning device |
JPS6125119A (en) * | 1984-07-14 | 1986-02-04 | Fujitsu Ltd | Laser scanner |
-
1973
- 1973-04-25 JP JP48047466A patent/JPS5849851B2/en not_active Expired
Non-Patent Citations (2)
Title |
---|
IBM TECHNICAL DISCLOSURE BULLETIN#V10#N3=1967 * |
IBM TECHNICAL DISCLOSURE BULLETIN#V10#N8=1968 * |
Also Published As
Publication number | Publication date |
---|---|
JPS49134343A (en) | 1974-12-24 |
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