JPS5933423A - Scanning system - Google Patents
Scanning systemInfo
- Publication number
- JPS5933423A JPS5933423A JP57142865A JP14286582A JPS5933423A JP S5933423 A JPS5933423 A JP S5933423A JP 57142865 A JP57142865 A JP 57142865A JP 14286582 A JP14286582 A JP 14286582A JP S5933423 A JPS5933423 A JP S5933423A
- Authority
- JP
- Japan
- Prior art keywords
- scanning
- constant
- laser
- hologram
- face
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/106—Scanning systems having diffraction gratings as scanning elements, e.g. holographic scanners
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
- Fax Reproducing Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
（Ｒ） 発明の技術分野
本発明はホログラムスキャナーを使ったレーザプリンタ
の走直において、ホログラムの走査軌ｐＪ・の１ｈυβ
性を損わずに、一定の漂化周波牧と一定のつＹ、エネル
ギーで走査を行い、光軸付近と走査面周辺の走査速度の
違いによる画素の密度ムラを補正し、印字品質を向上さ
せる走査方式に関する。Detailed Description of the Invention (R) Technical Field of the Invention The present invention is directed to the scanning trajectory pJ of a hologram, which is 1hυβ, in a laser printer using a hologram scanner.
Scanning is performed with a constant drifting frequency and constant Y and energy without sacrificing performance, correcting uneven pixel density due to differences in scanning speed near the optical axis and around the scanning surface, and improving print quality. Regarding the scanning method used.
（１））従来技術と問題点
従来レーザ光を使った高速プリンタは、例えば第１図に
示すようにレーザ発振器１からＣ）レーザビームが光学
系２により小さくして変調器３に入射し、変調周波数帯
域が広くとれるようＶこしている。印字信号に従い弾度
変調されたビームは結像レンズ４で一県速したときのス
ボシト径が小さくナルように、ビームエキスノくンダ５
で拡大する０走査機には回転多面鏡６を用いている。回
転多面鏡６の前後にあるシリンドリカルレンズ７、トロ
イダルレンズ８は回転多面鐘６の名反９１而の倒れ誤差
による走査線のピッチムラを補正するＯ走査されたビー
ムはｆθレレンで集速され、ドラム状の感光体９上に照
射す６゜
ｆθレレン４は走査面を千訂１にする必要上回転多面鏡
６の後方に配昭される０通兇のレンズと異る点は、第２
図（イ）（ロ）に示すように走査面上のう１１１からの
像高ｙ（走査幅Ａ＝２１＞とビームの偏向角θとの関係
が焦点Ｗμ＃ｆとすればｙ＝ｆθで与えらＪする（一般
のレンズでは障Ｍｙｐ＝ｆｔａｎθ）０走査速度が光１
１４ｈ ｆ”ｌ近と走査面の周辺とでは走査速度が異る
ブこめ画素密度にムラが生ずる点をｆθレレン４で走査
速度を一定にしてＭ’Ｆ消している。(1)) Prior Art and Problems In a conventional high-speed printer using a laser beam, for example, as shown in FIG. V is used to widen the modulation frequency band. The beam whose elasticity is modulated in accordance with the print signal is transmitted through the imaging lens 4 so that the diameter of the beam is small and narrow when it is sped up by the imaging lens 4.
A rotating polygon mirror 6 is used for the 0-scanning machine that magnifies the image. The cylindrical lens 7 and toroidal lens 8 located before and after the rotating polygon mirror 6 correct the pitch unevenness of the scanning line due to the tilting error of the rotating polygon mirror 6. The 6° fθ lens 4 that irradiates onto the shaped photoreceptor 9 is different from the 0x lens placed behind the rotating polygon mirror 6 because it is necessary to make the scanning surface 100%.
As shown in Figures (A) and (B), if the relationship between the image height y (scanning width A = 21) and the beam deflection angle θ from the top 111 on the scanning plane is the focal point Wμ#f, then y = fθ. given J (in general lenses, the obstacle Myp=ftanθ) 0 scanning speed is light 1
14h The scanning speed is different near f''l and at the periphery of the scanning plane.The point where the pixel density is uneven is eliminated by M'F by keeping the scanning speed constant using the f.theta.
このｆθレレン４は大きな負の歪収差を持つレンズであ
り、非水に高師であり、又多数の光学部品を用いている
ので５．ｉｌ￥整もむずかしい等問題があった０
（ｃ） 発明の目的
本発明の目的はｆθレレンなしで、ホログラムの走査軌
跡の直線を損うことなく、一定の標本化周波数と一定の
光エネルギーで走査を行い走査面の画素密度ムラを補正
し均一にする走五方式を提供することにある。This f-theta lens 4 is a lens with a large negative distortion aberration, is extremely sophisticated, and uses a large number of optical components, so 5. (c) Purpose of the Invention The purpose of the present invention is to obtain a hologram with a constant sampling frequency and a constant light energy without using an fθ lens and without damaging the straight line of the scanning trajectory of the hologram. It is an object of the present invention to provide a scanning method that performs scanning to correct uneven pixel density on a scanning surface and make it uniform.
（ｄ） 発明の構成
そしてこの目的は、本発明によれば、ホログラム板を一
定角速度または線速度で移動させる機構を備え、半導体
レーザ等より発光したレーザを前記ホログラム板に透過
し、その透過位置によってビーム出力の進行方向を変え
て走査面上を走査する方法において、前記走査面上で一
定でない線速度のレーザビームを、該レーザビームの変
ｆｌ’Ｍ周波数を可変中（蒙に二〇可変して、走査向上
での標本化周波数を一定にさせるとともに、該走査面Ｈ
の各標本点ＩＶの尤エネルギーを同一１（する手段によ
り補正して走査することを！持テ１ｔとする走査方式を
提供することによって達成される。(d) Structure and object of the invention: According to the present invention, a mechanism is provided for moving a hologram plate at a constant angular velocity or linear velocity, and a laser emitted from a semiconductor laser or the like is transmitted through the hologram plate, and the transmission position is determined. In the method of scanning a scanning surface by changing the traveling direction of the beam output, a laser beam having a linear velocity that is not constant on the scanning surface is applied while the variable fl'M frequency of the laser beam is being varied (20 variable frequency). In this way, the sampling frequency in scanning enhancement is made constant, and the scanning plane H
This is achieved by providing a scanning method that corrects the likelihood energy of each sample point IV by the same means.
（ｅ） 発明の実施例 以下本発明の実施例を図面によって詳述する。(e) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.
第３図（イ）は本発明の詳細な説明するための平面図で
、ホログラム板１０が一定速度で回転している。光走査
（スキャン）するとき、角度が一定に動き平面上に投影
されるので、走査面ａまでの距１１１１Ｇは（の周辺で
は長くなり、走査面ａを走るビーム速度は第３図（ロ）
に示すように走査面ａの周辺Ｃでは光軸側近すより速度
が速くなる。従ってレーザ出力が一定のために、速く走
査されるところは光景が少く、露光エネルギーが不足す
る。FIG. 3(a) is a plan view for explaining the present invention in detail, in which the hologram plate 10 is rotating at a constant speed. When scanning, the angle remains constant and is projected onto a plane, so the distance 1111G to the scanning plane a becomes longer around (), and the beam speed running on the scanning plane a is as shown in Figure 3 (b).
As shown in , the speed is faster at the periphery C of the scanning plane a than near the optical axis. Therefore, since the laser output is constant, the scene that is scanned quickly is small and the exposure energy is insufficient.
そこで、ホログラムスキャナの露光エネルギー補正につ
いて、ホロクラムスキャナの特性改善のために、走査の
等速度性を犠牲にして第４図（イ）に示す走査面上の等
速度走査の軌跡ｄより実際の走査軌跡Ｘ （ｔｌである
ようにした場合、即ちレーザ出力を一定とし、かつ走査
面（ドラム面）上でのドツトピッチが一定となるように
、ドツトの時間間隔を補正すると、ドラム面の露光エネ
ルギーが一定でなくなる。Therefore, regarding the exposure energy correction of the hologram scanner, in order to improve the characteristics of the hologram scanner, we sacrificed the uniform velocity of the scan to make the actual trajectory d of the uniform velocity scan on the scanning surface shown in Fig. 4 (a). When the scanning trajectory is no longer constant.
このため、下記方法でレーザ出力を制御して露光エネル
ギーが一定になるように補正する必要がある。Therefore, it is necessary to correct the exposure energy by controlling the laser output using the method described below.
（１） ホログラムスキャナの透過効率を、走査角に
従って変える。この方法は走査面の両端で、所定のホロ
グラムの透過効率を、真中ではそれを下げて行うので、
光学効率上問題がある０（２） ドツト毎に、レーザ
の駆動電流を変える。(1) Change the transmission efficiency of the hologram scanner according to the scanning angle. This method reduces the transmission efficiency of a given hologram at both ends of the scanning plane, and lowers it in the middle.
0 (2), which has a problem in terms of optical efficiency.The laser drive current is changed for each dot.
この方法は走査面の両端で、所定のし′−ザ出力を、真
中ではその出力を減らして行うので、所所のレーザ出力
が出力されない点に問題がある。This method has a problem in that certain laser outputs are not output because a predetermined laser output is applied at both ends of the scanning plane and the output is reduced at the center.
（３） ドツト毎に、レーザの駆動デユーティ比を変え
る。この方法は例えばデユーティ比（後コホのｔｎ／Ｔ
ｎ）５０チで等しい軍、力を１１）るためにはピーク電
１γｒ、値がイｉスになり、レーザ寿命に問題がある。(3) Change the laser drive duty ratio for each dot. This method uses, for example, the duty ratio (tn/T of the rear
n) In order to make the force equal to 50 cm and the power 11), the peak current is 1γr, and the value becomes I, which poses a problem in the laser life.
レーザ出力を制律ルて露光エネルギーを一定にするには
、上記のような問題点がある。そこで、本発明では上記
補正方法の問題を改善したレーザ出力の制御を行うよう
にした０
以下、露光エネルギーが一定になるようなレーザ出力の
制御１を考える０
第４図（ロ）はレーザの駆りＩｌ市流を示し、第ｎ番目
の駆動電流Ｉｎ＋ｎ番の駆ＩＩＩ電流が印加される時Ｏ
Ｎ、ＯＦＦ両方含めたそのドツトの割り撮られた時１Ｘ
ｊｊ Ｔｎとする。There are the above-mentioned problems in controlling the laser output to make the exposure energy constant. Therefore, in the present invention, the problem of the above-mentioned correction method is improved by controlling the laser output. Below, we will consider control 1 of the laser output so that the exposure energy is constant. Figure 4 (b) shows the laser output. When the n-th driving current In+the n-th driving current is applied, O
1X when that dot is captured, including both N and OFF.
jj Tn.
ットの）平均走査速度
ｎ
とする。この間にレーザが発光する元パワーＰｎは第ｎ
）’クトと１１Ｃ照射さＪｌているドラム上の単位時間
当りのｍ１棺Ｓｎは
匠ってＭｎドツトのドラム上の元エネルギー ＥｎはＥ
ｎ−Ｙ＊ ＠Ｐｎ／Ｓｎ 但し、Ｙｔは光学系の効率
、ビームが鋭く紋れていｉｔ ｒＪ： 、デユーディ比
で割りでもよいが、現実的にはビームが広がっていて、
隣りと連がっている場合が多い０この場合ビームの強度
分布は上知１分布に近いが、すそ野がふれ合って加算さ
れ、連がってしまう０するとデユーディ比は大きくは効
かなくなり、近イ秋的に第ｎドツトとして照射されるド
ラム上のｎ′１位１１１間当りの而［ＳｎキＰａｌ・Ｖ
ｎと考えて良い。このｔｈｅのドラム上の光エネルギー
Ｅｎ 。Let n be the average scanning speed (of the cut). During this period, the original power Pn at which the laser emits light is the nth
)' m1 per unit time on the drum that is irradiated with 11C and Sn is the original energy on the drum of Mn dots.En is E
n-Y* @Pn/Sn However, Yt is the efficiency of the optical system, the beam is sharply curved, it rJ:, and can be divided by the duty ratio, but in reality, the beam is spread out,
In this case, the intensity distribution of the beam is close to the Kochi 1 distribution, but when the bases touch and are added together, the duty ratio does not have a large effect and the beam intensity distribution is The n'1 point on the drum that is irradiated as the nth dot in the fall [SnK Pal V
You can think of it as n. The light energy En on the drum of this.
今、前述の（３）のドツト毎にレーザの１駆動デ５．−
ティ比を変えて同じ電力を１尋る神止方しノＰを考える
と、Ｉｎ＝：１＝ｃｎｎｓｔの時、Ｅｎ ＝ ｅ ＝
ｃｏｎｓｔとすれば、前述の０式より
Ｖｎ ＝”−！” ” −’−＝ ｃｏｎｓｔＰｓ
ｅ
これは等速度走査の時しか不可能である。ビームの主走
査方向の径を犬きくした場合は、前述の０式が成立する
という現実を利用して、ｌｎ＝１＝ｃｏｎｓｔの時、Ｅ
ｎ ＝ ｅ ＝ ｃｏｎｓｔの条件苓−考える。Now, for each dot in (3) mentioned above, 5. −
Considering the method of stopping power by changing the tee ratio and using the same power by 1, when In=:1=cnnst, En=e=
If it is const, then from the above formula 0, Vn = "-!" ” -'-= constPs
e This is only possible when scanning at constant speed. When the diameter of the beam in the main scanning direction is increased, the above-mentioned formula 0 holds true, and when ln=1=const, E
Consider the condition of n = e = const.
主走査ピッチをＰｍとすると、Ｐｍ＝Ｖｎ・Ｔｎであり
、これを前述の０式に代入して
となるようにｌ１ｉｌｊ御すればよい。If the main scanning pitch is Pm, then Pm=Vn·Tn, which can be substituted into the above-mentioned equation 0 and controlled as follows.
第５図は本発明の走査方式の一実施例を示す制御ブロッ
ク図を示す。FIG. 5 shows a control block diagram showing an embodiment of the scanning method of the present invention.
図において、モータ１１によりホログラム板１２は一定
回転していて、ファンクションジェネレータ１３により
発生したホログラムスキャナーの特性改善のための信号
Ｐを周波数発振器（ＶＦＯ）１４によりモジュレータ１
５へ周波数発振する。In the figure, a hologram plate 12 is constantly rotated by a motor 11, and a signal P generated by a function generator 13 for improving the characteristics of the hologram scanner is transmitted to a modulator 1 by a frequency oscillator (VFO) 14.
The frequency oscillates to 5.
該モジュレータ１５はν−ザダイオード（レーザ′り゛
イオードとコリメニタレンズユニットは一体にある）１
６をＯＮし、ホログラム板１２によりモータ１Ｂにより
回転されているドラム１９上をビーームスキャン１７す
る。又モジ−レータｉ ５ （ｔｉマルチバイブレータ
２０よりの一定時間ｔｎ信号によりレーザダイオード１
６をＯＦＦする。The modulator 15 is a ν-the diode (the laser diode and the collimator lens unit are integrated) 1
6 is turned on, and the hologram plate 12 performs a beam scan 17 on the drum 19 being rotated by the motor 1B. In addition, the laser diode 1 is activated by the constant time tn signal from the modulator i 5 (ti multivibrator 20).
6 is turned off.
上記のように、ホログラムスキャナーの特性改善のため
の信号Ｐにより変調された変ｉＩ！！（周波数によりド
ラム上の標本化ピッチ（主走介ピッチＰｍ）が一定にな
るようにドツト間隔を変化させているが、レーザダイオ
ード１６の点灯時間ｔｎは一定としているので、ドラム
１９上の露光エネルギーは一定になる・０
又別の実施例として、第６Ｍ（イ）に斤すようにホログ
ラム板１２を一定回転させていて、第６し１（ロ）に示
すようにホログラムＡｌｉ １２の透過ギＹ、か走査面
の両唱で旨くシておけば、前夫より同様のことが言える
。As mentioned above, the variable iI! modulated by the signal P for improving the characteristics of the hologram scanner! ! (The dot spacing is changed depending on the frequency so that the sampling pitch (main running pitch Pm) on the drum is constant, but since the lighting time tn of the laser diode 16 is constant, the exposure energy on the drum 19 is As another example, the hologram plate 12 is rotated at a constant rate as shown in No. 6M (a), and the transmission gear of the hologram Ali 12 is fixed as shown in No. 6M (b). I can say the same thing about my ex-husband if I do a good job with both Y and scanning.
さらに、別の実施例として第７図（イ）に示すようにホ
ログラム板１２を一定回転させておいて、第７図（ロ）
に示すようにレーザ“ダイオード１６の駆動回流ｉを変
化されば、前夫より同様のことが言えるＯ
上記実施例のようにホログラム板１２に等速Ｉｆｆ走査
の機能を持たせておい−Ｃ１ホログラノ、の走査軌跡の
直線性を４ハうことなく、ドラム１９上の神木化ピッチ
Ｐｍが一定となるように変調周波り９．を変化させると
ともに、一定の光エネルギーで走査するためにダイメー
トの点灯時間ｔｎを一定にするとか、或いは走査面（ド
ラム面）の両端と真中とで、ホログラムの透過率を変え
るとか、又はレーザの駆動電流を変えるとかして、レー
ザビームを走査することにより、従来のようにｆθレレ
ンを用いることなく、走査面（ドラム面）の露光エネル
ギーが一定になり、画素密度ムラのない印字が得られる
。又ｆθレレンの高価な部品を必要とせず安価である。Furthermore, as another embodiment, the hologram plate 12 is rotated at a constant rate as shown in FIG.
If the drive circulation i of the laser diode 16 is changed as shown in the figure, the same thing can be said as in the previous example.If the hologram plate 12 is provided with a constant velocity Iff scanning function as in the above embodiment, the C1 hologram, The modulation frequency 9. is changed so that the sacred pitch Pm on the drum 19 is constant without changing the linearity of the scanning locus, and the lighting time of the dymate is changed in order to scan with a constant light energy. By scanning the laser beam by keeping tn constant, or by changing the transmittance of the hologram at both ends and the center of the scanning surface (drum surface), or by changing the laser drive current, The exposure energy on the scanning surface (drum surface) becomes constant without using an f.theta.-relen, and printing without uneven pixel density can be obtained.Furthermore, it is inexpensive because it does not require expensive parts of the f.theta.-relen.
（ｆ） 発明の効果
以上、詳細に説明したように、本発明の走査方式はホロ
グラムの走査軌跡の直線性を損うことなく、一定の標本
化周波数と一定の光エネルギーで走査を行うことにより
従来のｆθレレンを用いることなく、ドラム上の露光エ
ネルギーが一定し、面素＠度ムラのない印字が安価に得
られる。(f) Effects of the Invention As explained in detail above, the scanning method of the present invention is capable of scanning at a constant sampling frequency and constant optical energy without impairing the linearity of the scanning trajectory of the hologram. The exposure energy on the drum is constant without using the conventional f-theta lens, and printing with uniform surface density can be obtained at low cost.
第１図は従来のレーザプリンタの概略を説明するための
断面図、第２図はｆθレレンを説明するためのＶで、（
イ）は平面図、（ロ）は側面図、第３図は本発明の詳細
な説明するだめの図で、（イ）は平面図、（イ）はドラ
ム上のホログラムの走査軸１跡を示す図、第４図（ロ）
はレーザの駆り１電流を示す図、第５図は本発明の走査
方式の一実施例を示す制御ブロック図、第６図（イ）（
ロ）は本発明の別の実施例を示すグラフ、第７図（イ）
（ロ）は本発明の他の実施例を示すグラフを示す。
図において、１０．１２はホログラム板、１１はモータ
、１３はファンクションジェネレータ、１４は周′ｅ数
発振器、１５はモジ−レータ、１６はレーザダイオード
、１７はビームスキャン、１８はモータ、１９はドラム
である。
簗 １ ロ
ー」
華 ２ 口
＝１３
菓 ４ 口
（イノ
Ｃ口）
雷Fig. 1 is a cross-sectional view for explaining the outline of a conventional laser printer, and Fig. 2 is a V for explaining the fθ relen.
A) is a plan view, (B) is a side view, and FIG. 3 is a diagram for explaining the present invention in detail. Figure 4 (b)
5 is a control block diagram showing an embodiment of the scanning method of the present invention, and FIG.
B) is a graph showing another embodiment of the present invention, FIG. 7(A)
(b) shows a graph showing another example of the present invention. In the figure, 10.12 is a hologram plate, 11 is a motor, 13 is a function generator, 14 is a frequency oscillator, 15 is a modulator, 16 is a laser diode, 17 is a beam scan, 18 is a motor, and 19 is a drum. It is. Yan 1 low” Hana 2 mouth = 13 Ka 4 mouth (Inno C mouth) Thunder
Claims (1)
構を（ｌｆｔｔえ、半導体レーザ等より発光したレーザ
を前記ホログラム板に透過し、その透過位置によってビ
ーム出力の進行方向を変えて走査面上を走査する方法に
おいて、前記走査面上でない線速度のレーザビームを、
該レーザビームの変調周波数をｎ、（変手段によりｎ１
変して、走査面上での標本化層＃ｐを一定にさせるとと
もに、該走査面上の各欅木点イσの光エネルギーを１７
５１−にする手段により補正して走査することを特徴と
する走査方式。A mechanism for moving the hologram plate forward at a constant speed or speed is used. Laser emitted from a semiconductor laser or the like is transmitted through the hologram plate, and the traveling direction of the beam output is changed depending on the transmission position, so that the beam output is directed onto the scanning surface. In the method of scanning a laser beam at a linear velocity that is not on the scanning surface,
The modulation frequency of the laser beam is n, (n1 by the changing means
By changing the sampling layer #p on the scanning plane to be constant, the light energy of each zelkova point σ on the scanning plane is set to 17
51- A scanning method characterized in that scanning is performed with correction by a means for making a correction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57142865A JPH081492B2 (en) | 1982-08-18 | 1982-08-18 | Scanning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57142865A JPH081492B2 (en) | 1982-08-18 | 1982-08-18 | Scanning method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5933423A true JPS5933423A (en) | 1984-02-23 |
| JPH081492B2 JPH081492B2 (en) | 1996-01-10 |
Family
ID=15325399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57142865A Expired - Lifetime JPH081492B2 (en) | 1982-08-18 | 1982-08-18 | Scanning method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH081492B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157522A (en) * | 1991-04-01 | 1992-10-20 | Eastman Kodak Company | Method and apparatus for providing correction of hologon transmission efficiency variations |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3550487A1 (en) | 2018-04-06 | 2019-10-09 | Illinois Tool Works Inc. | Secure access locker banks |
| GB201914526D0 (en) | 2019-10-08 | 2019-11-20 | Illinois Tool Works | Secure access locker banks |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624310A (en) * | 1979-08-02 | 1981-03-07 | Ricoh Co Ltd | Hologram for hologram scanner and its production |
| JPS56102821A (en) * | 1980-01-18 | 1981-08-17 | Dainippon Screen Mfg Co Ltd | Correction method for ununiformity of scanning line interval in light beam scanning |
| JPS56109313A (en) * | 1980-02-05 | 1981-08-29 | Canon Inc | Light beam scanner |
| JPS57138266A (en) * | 1981-02-19 | 1982-08-26 | Yokogawa Hokushin Electric Corp | Photoscanner |
-
1982
- 1982-08-18 JP JP57142865A patent/JPH081492B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5624310A (en) * | 1979-08-02 | 1981-03-07 | Ricoh Co Ltd | Hologram for hologram scanner and its production |
| JPS56102821A (en) * | 1980-01-18 | 1981-08-17 | Dainippon Screen Mfg Co Ltd | Correction method for ununiformity of scanning line interval in light beam scanning |
| JPS56109313A (en) * | 1980-02-05 | 1981-08-29 | Canon Inc | Light beam scanner |
| JPS57138266A (en) * | 1981-02-19 | 1982-08-26 | Yokogawa Hokushin Electric Corp | Photoscanner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5157522A (en) * | 1991-04-01 | 1992-10-20 | Eastman Kodak Company | Method and apparatus for providing correction of hologon transmission efficiency variations |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH081492B2 (en) | 1996-01-10 |
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