JPS5878169A - Optical imaging device - Google Patents

Optical imaging device

Info

Publication number
JPS5878169A
JPS5878169A JP56176722A JP17672281A JPS5878169A JP S5878169 A JPS5878169 A JP S5878169A JP 56176722 A JP56176722 A JP 56176722A JP 17672281 A JP17672281 A JP 17672281A JP S5878169 A JPS5878169 A JP S5878169A
Authority
JP
Japan
Prior art keywords
liquid crystal
copying
optical signal
toner
printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56176722A
Other languages
Japanese (ja)
Inventor
Kenji Aoki
健二 青木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP56176722A priority Critical patent/JPS5878169A/en
Publication of JPS5878169A publication Critical patent/JPS5878169A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
    • G03G15/047—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas for discharging non-image areas

Abstract

PURPOSE:To eliminate sticking of toner to an unnecessary part, by erasing an electric charge at an unnecessary part of a photoreceptor by the output of an optical signal generating part using a liquid crystal microshutter array in case of copying on narrow paper in the width to be copied to the maximum. CONSTITUTION:A copy process is exactly the same as that of conventional original moving types and a charge 9, a light source 22 for original, an optical system 10 for image formation, a quick imaging device 11 and a transferring device 12 are set around a photoreceptor 6. An optical signal generating part 18 has a liquid crystal microshutter array as a luminous intensity tone element and is added with a printing function. At the time of copying, a latent image of a part 5 as expressed by figure is erased by impinging a printing optical signal only on the part 5 of paper and a toner is not stuck entirely to an unncessary part.

Description

【発明の詳細な説明】 本発明は複写機能の他、外部信号によりて印刷をも行う
機能を備えた複写機に関わる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine having not only a copying function but also a printing function based on an external signal.

従来、複写機で、Ａ４　、Ｂａ等種★のサイズの用紙に
複写を行う際、第１図に示す如く、今感光体の巾４が、
Ｂ４サイズとすれば、Ａ−サイ゛ズ３の巾だけで儂露光
后、トナー現儂を行うと、Ａ４サイズ分の面積１中の文
学部分２の他、５のような不用部分にベッタリトナーが
付着するため、クリーナの負荷が大変大きくなる他、用
紙に転写する際、少しずれると、用紙の端部にトナーが
転写され、第２図の如゛くなりてしまり九シした・本発
明はかかる欠点を除去し、光信号発生部を使用し、簡便
な解決法を見出すことを目的とするｃ本発明の構成は例
えば第５図に示す如く基本的に複写プロセスは従来の原
稿移動型のそれと全く同一で、感光体６０周辺に、チャ
ーシア９、原稿照明用光源２２、結像用光学系１０、現
偉器１１、転写器１２がセットされ、さらに用紙をフィ
ードする紐輪送部１４、定着部１５から構成され、その
上に移動型原稿台１５がのっている。Conventionally, when copying on paper of size ★ such as A4 or Ba with a copying machine, the width 4 of the photoreceptor is as shown in Fig. 1.
If it is B4 size, if I perform toner application after exposure with only the width of A-size 3, I will apply solid toner to the unnecessary areas such as 5 in addition to the literature part 2 of the A4 size area 1. As the toner adheres to the toner, the load on the cleaner becomes very large.In addition, if there is a slight deviation when transferring the toner to the paper, the toner will be transferred to the edge of the paper, resulting in the result as shown in Figure 2. The purpose of the present invention is to eliminate such drawbacks and find a simple solution by using an optical signal generator.The structure of the present invention is as shown in FIG. This is exactly the same as that of the photoconductor 60, in which a chartrear 9, a document illumination light source 22, an imaging optical system 10, a developing device 11, and a transfer device 12 are set, and a string feeding section 14 that feeds paper is further provided. , and a fixing section 15, on which a movable document table 15 is placed.

光信号発生部１８は、光変調素子として液晶マイクロシ
ャッターアレーを有しており、印刷機能を付加している
。The optical signal generating section 18 has a liquid crystal micro-shutter array as a light modulation element, and has an additional printing function.

し九がりて、複写時に、第１図の例の場合、印刷光信号
を、５の部分にのみあてるようにすれば、第４図に示す
如く、潜儂が消去されるので、トナーは不用部分に全く
つかなくなるので、上述の欠点を容易に除去することが
出る。Furthermore, when copying, in the case of the example shown in Figure 1, if the printing optical signal is applied only to the part 5, as shown in Figure 4, the latent image will be erased, and the toner will be unnecessary. Since it does not stick to the parts at all, the above-mentioned drawbacks can be easily eliminated.

本発明は、システムを小型、低価格に構成出来る液晶パ
ネルを使用した光信号発生方式に着目、実用上申し分な
い印刷速度をも得ているので以下説明する。The present invention focuses on an optical signal generation method using a liquid crystal panel that allows the system to be configured in a small size and at a low cost, and also achieves a printing speed that is satisfactory for practical use, so it will be explained below.

第５図は、本発明に使用した比較的低周波で鱒電緩和を
生じるネマチック液晶の一般的な誘電異方性の周波数特
性を示した図である。交差周波数ｆｃよシ低い周波数ｆ
１で誘電異方性は正であり、高い周波数ｆｈでは負であ
る。ｆｊ、ｆｈに対する誘電異方性をそれぞれΔｔＬ、
ΔｔＨとした。FIG. 5 is a diagram showing the frequency characteristics of the general dielectric anisotropy of the nematic liquid crystal used in the present invention, which undergoes electric relaxation at a relatively low frequency. Frequency f lower than crossover frequency fc
1, the dielectric anisotropy is positive and at high frequencies fh it is negative. The dielectric anisotropy for fj and fh is ΔtL,
It was set as ΔtH.

Δ＊　Ｌ＞Ｏであシ、ΔｔＨ＜Ｑである。このような特
性を持つネマチック液晶を〒Ｎ方式の素子に用いた時、
ｆｌの信号を印加した時、液晶分子の長軸は電界方向に
平行になり、ｆｈの信号を印加し走時、電界方向に垂直
になる。ねじれネマチック配向をしている液晶層の両面
に偏光板を互に偏光面が直交するように配置するとｆｌ
を印加した時光をさえぎり、ｆｈを印加した時光が透過
する〇つまシ液晶ライトパルプの機能としてｆｌの信号
によりオフ、ｆｈの信号によジオンする・第６図に液晶
ライトバルブの液晶パネル構成の一例を示す・５１は信
号電極を備えるガラス基板である。３６．５６−１及び
３６−２は信号電極であり、３６は、配化インジウムあ
るいは配化スズ等の透明電極、５６−１．５６−２はそ
れぞれクロム、金電極である。３２は共通電極を備える
ガラス基板であシ、５７．５７−１及び５７−２は共通
電極である。ｓ７は、透明電極、３７．７１及び３７−
２は金属などの不透明な電極である。Δ*L>O, and ΔtH<Q. When a nematic liquid crystal with such characteristics is used in a 〒N type device,
When the signal fl is applied, the long axis of the liquid crystal molecules becomes parallel to the direction of the electric field, and when the signal fh is applied, the long axis of the liquid crystal molecules becomes perpendicular to the direction of the electric field. When polarizing plates are placed on both sides of a liquid crystal layer with twisted nematic orientation so that the planes of polarization are perpendicular to each other,
The function of the liquid crystal light pulp is that it is turned off by the fl signal and turned on by the fh signal. Figure 6 shows the liquid crystal panel configuration of the liquid crystal light valve. As an example, 51 is a glass substrate provided with a signal electrode. 36.56-1 and 36-2 are signal electrodes, 36 is a transparent electrode such as indium or tin, and 56-1 and 56-2 are chromium and gold electrodes, respectively. 32 is a glass substrate provided with a common electrode, and 57, 57-1 and 57-2 are common electrodes. s7 is a transparent electrode, 37.71 and 37-
2 is an opaque electrode made of metal or the like.

３８は透明な部分である。キ記２枚のガラス基板は５５
のシール剤により固定され５４に液晶組成物が封入され
ている。３５は偏光板である。38 is a transparent part. The two glass substrates are 55
A liquid crystal composition is sealed in 54 with a sealant. 35 is a polarizing plate.

次に液晶ライトバルブに要求される特性について述べる
。Next, we will discuss the characteristics required of a liquid crystal light valve.

（１）くり返し周波数が大きく、かつ履歴効果がないこ
と・ （？）開口時における光透過率が大きいこと。(1) High repetition frequency and no hysteresis effect (?) High light transmittance when open.

以上２項目が重畳な特性である・〈シ返し周波数の逆数
が一辺の書き込み時間である。The above two items are superimposed characteristics.The reciprocal of the repeat frequency is the writing time for one side.

履歴効果がないことは大変重要な要素である。The absence of history effects is a very important factor.

従来から液晶のダイナミックドライブは、液晶の履歴効
果である累積応答効果を用いており、これは通常のねじ
れネマチック素子、あるいは２、周波法ダイナミックド
ライブ方式に限らずこの効果を用いている。しかしなが
ら本発明のごとく高速の液晶ライトバルブにおいては上
記効果は有害であり、できる限り排除しなければなら表
い。この観点で、−回の書き込み時間中に必すｆｊの信
号を加えて液晶内部のポテンシャルレベルヲ常に一定レ
ベルにそろ゛えて後、次の書込み時間に入るように駆動
することによって上記効果、を低減することができる・
・ 第７図を用いて液晶ライトバルブの光透過応答１性につ
いて説明する。第９図（ｂ）の信号を液晶ライトバルブ
に印加する時、 〒１の書き込み時間は、Ｔ２の開口時間と〒３の閉口時
間、あるいは！２゛　の非開口時間と！３の閉口時間で
構成される。〒２の間は、基本的にはｆｈの信号を印加
する。ただしｆｈの信号だけでなく液晶ライトバルブが
開口する信号（例えばｆｈＫｆＪ声重畳されている形で
あってもｆｈの効果が大きく液晶ライトバルブが開けば
良い）であれば良い。〒３の間は基本的にはｆ、ｌの信
号を印加する。九だしｆｌの信号だけでなく液晶ライト
バルブが閉口する一信号（例えばｆＪＫｆｈが重畳され
ている形でありてもｆｊの効果が大きく液晶うイトバル
プカｉ閉じれば良い）であればよい。Dynamic drive of liquid crystals has conventionally used the cumulative response effect, which is the hysteresis effect of liquid crystals, and this effect is used not only in ordinary twisted nematic elements, but also in frequency method dynamic drive systems. However, in a high-speed liquid crystal light valve like the present invention, the above-mentioned effect is harmful and must be eliminated as much as possible. From this point of view, the above effect can be achieved by applying the necessary fj signal during the - times writing time to keep the potential level inside the liquid crystal at a constant level, and then driving the liquid crystal so that the next writing time starts. can be reduced.
- The light transmission response uniformity of a liquid crystal light valve will be explained using FIG. When applying the signal shown in FIG. 9(b) to the liquid crystal light valve, the writing time of 〒1 is equal to the opening time of T2 and the closing time of 〒3, or! 2゛ non-opening time! It consists of 3 closing times. During 〒2, basically the fh signal is applied. However, in addition to the fh signal, any signal that causes the liquid crystal light valve to open may be used (for example, even if the fhKfJ voice is superimposed, the effect of fh is large enough to open the liquid crystal light valve). During the period 〒3, basically signals of f and l are applied. In addition to the nine-point fl signal, any signal that causes the liquid crystal light valve to close (for example, even if fJKfh is superimposed, the effect of fj is large enough to close the liquid crystal light valve i) may be used.

Ｔ２°の間は　Ｔ２１　　において液晶ライトパルプが
開口しない信号を印加する。つｔｂ−ｔ−の信号は、液
晶ライトパルプを開口させる信号であっても、応答が遅
いため１２′の関そは開口しない信号であればよい。During T2°, a signal is applied that does not cause the liquid crystal light pulp to open at T21. Even if the signal tb-t- is a signal that opens the liquid crystal light pulp, it may be a signal that does not open the gate 12' because the response is slow.

次に、液晶材料としては、鉤電緩和を生じるネマチック
液晶に光学活性物質を添加し、籾電緩和を生じるコレス
テリック液晶となしたものを使用し、上述の如くシャッ
ターを連続して開く場合においても、一度閉じてから開
専直すことつまりｆｈの信号の印加時間は〒２で一定で
あることと、−回の書き込み時間Ｔ１のうちＴＳはｆｌ
の信号が印加される駆動するのが最大の特徴である１、
実際の例を次に述べる。Next, as a liquid crystal material, we use a nematic liquid crystal that causes cholesteric relaxation, which is made by adding an optically active substance to create a cholesteric liquid crystal that causes cholesteric relaxation, even when the shutters are opened continuously as described above. , once closed and then reopened, that is, the application time of the fh signal is constant at 〒2, and TS is fl in the - writing time T1.
The biggest feature is that it is driven by applying a signal of 1.
An actual example is given below.

第８図は、本発明による液晶ライトパルプの光透過応答
特性である。夛定条件は、液晶層厚５−１温度３５℃、
ｆ　ｊ　Ｈ２Ｋ　Ｈｚ　＊　ｆ　ｈ：　１　！Ｉ　Ｏ”
　”２、〒１；２１１１秒、？２ｉ１−秒、Ｖ１；３０
Ｖである。液晶材料は、メルク社製ネマチック液晶（１
０８５）に、光学活性物質４−（２−メチルブチル）−
４″　−シアノビフヱニルを５重量％添加した長周期コ
レステリック液晶である０上記レスポンスは、１ｏ　ｄ
ｏｔ／ａｓの分解能で、−ライン（ラインピッチ１００
μ−）　２　ｓ　ｓｅｃで書き込めることを示しており
、Ａ４巾を６秒で印刷出来る能力を有することを、意味
し、従来の液晶パネルによる光信号発生装置に比較して
格段（数１０倍）高速になっており、実用上充分な速度
を寮現している。FIG. 8 shows the light transmission response characteristics of the liquid crystal light pulp according to the present invention. The experimental conditions were: liquid crystal layer thickness: 5-1; temperature: 35°C;
f j H2K Hz * f h: 1! IO”
``2, 〒1; 2111 seconds, ?2i1-seconds, V1; 30
It is V. The liquid crystal material is nematic liquid crystal (1
085), optically active substance 4-(2-methylbutyl)-
4'' - long period cholesteric liquid crystal containing 5% by weight of cyano biphenyl The above response is 1 o d
-line (line pitch 100
μ-) 2 s sec, meaning that it has the ability to print an A4 sheet in 6 seconds, which is significantly (several 10 times more) than a conventional optical signal generator using a liquid crystal panel. The speed is high enough for practical use.

以上、鎮々述べて来たように、本発明によれば、小型、
安価で、速度は充分であり、従来の複写機をはとんどそ
のまま共通に使用することが出来る複写機能と、印刷機
能を有し、かつ、複写時の、不用部分へのトナー付着〜
対策も簡便に実施出来る光印写装置を提供出来る。As described above, according to the present invention, small size,
It is inexpensive, has sufficient speed, has copying and printing functions that can be used in common with conventional copying machines, and prevents toner from adhering to unnecessary areas when copying.
It is possible to provide an optical printing device in which countermeasures can be easily implemented.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の方式によるトナー現偉后のトナー分巾 第２図状、従来の方式によってトナー現儂后、転写した
もの 第３図は、本発明の構成 第４図は、本発明によりて、処理層トナー現像したもの 第５図は、液晶組成物の誘電異方性の周波特性を示す。 第６図は、液晶マイクロシャッターアレーの断面図。 第７図は、駆動方式、第８図は実際の光応答を示す。 １８は、光信号発生部、４は最大複写可能中を示す。 以上 出願人　株式会社−訪精工舎 代理人　弁理士　最上　　務 り ；１ｓ　１　図 第２図 ｌ り：Ｓ　４　Ｌ、。 第５　Ｆ、・ｉ Ｆ 第６図FIG. 1 is a second diagram showing the toner width after the toner is transferred by the conventional method, and the toner image is transferred by the conventional method. FIG. 3 is the structure of the present invention. FIG. 5 shows the frequency characteristics of the dielectric anisotropy of the liquid crystal composition. FIG. 6 is a cross-sectional view of the liquid crystal micro-shutter array. FIG. 7 shows the driving method, and FIG. 8 shows the actual optical response. Reference numeral 18 indicates an optical signal generator, and 4 indicates a maximum copying capacity. Applicant: Hoseikosha Co., Ltd. Patent attorney: Tsutomu Mogami; 1s 1 Figure 2: S 4 L. 5th F,・i F Figure 6

Claims (2)

【特許請求の範囲】[Claims] （１）液晶マイクロシャッターアレーを有する光信号発
生部を備えた複写装置であって、該液晶マイクロシャッ
ターアレーの印刷可能中と最大複写可能中は＃１！は同
じであり、最大複写可能中より狭い用紙に複写を行う場
合は、感光体上の不豐部分の帯電を、該液晶マイクルシ
ャッターアレーによる光信号発生部出力によつ讐消去す
ることを％像とする光印写装置(1) A copying apparatus equipped with an optical signal generating section having a liquid crystal micro-shutter array, in which the liquid crystal micro-shutter array is #1 when printing is possible and when maximum copying is possible. are the same, and when copying on paper that is narrower than the maximum copying capacity, it is necessary to eliminate the static charge on the non-conducting portion of the photoconductor by using the output of the optical signal generator by the liquid crystal microshutter array. Optical printing device that produces images （２）液晶マイクロシャッターアレーは、透明電極を有
する２枚のガラス基板を対向させ、その間に誘電異方性
がゼ四になる交差周波数（以下ｆ”　ｊと略す）が常温
で１００１１ｚ’以下であるネマチック液晶に光学活性
物質を添加してなる液晶組成物を封入してなる液晶パネ
ルの両側に２枚の偏光板を備え、さらに該透明電極間に
、ｆｅよシ高い周波数ｃ以下ｔｂと略す）の信号と、ｆ
ｃよシ低い周波数（以下′ｆ４と略す）の信号を切り換
え七印加する液晶駆動回路を有することを特徴とする特
許請求の範囲第１項記載の光印写装置。(2) A liquid crystal micro-shutter array consists of two glass substrates with transparent electrodes facing each other, and a cross-over frequency (hereinafter abbreviated as f''j) at which the dielectric anisotropy becomes 4 at room temperature of 10011z' or less. A liquid crystal panel is formed by enclosing a liquid crystal composition made by adding an optically active substance to a certain nematic liquid crystal, and two polarizing plates are provided on both sides of the panel. ) and f
2. The optical printing apparatus according to claim 1, further comprising a liquid crystal drive circuit for switching and applying a signal of a lower frequency than f4 (hereinafter abbreviated as 'f4).
JP56176722A 1981-11-04 1981-11-04 Optical imaging device Pending JPS5878169A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56176722A JPS5878169A (en) 1981-11-04 1981-11-04 Optical imaging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56176722A JPS5878169A (en) 1981-11-04 1981-11-04 Optical imaging device

Publications (1)

Publication Number Publication Date
JPS5878169A true JPS5878169A (en) 1983-05-11

Family

ID=16018628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56176722A Pending JPS5878169A (en) 1981-11-04 1981-11-04 Optical imaging device

Country Status (1)

Country Link
JP (1) JPS5878169A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6088978A (en) * 1983-10-20 1985-05-18 Konishiroku Photo Ind Co Ltd Electrostatic copying machine
US4529294A (en) * 1984-03-16 1985-07-16 Xerox Corporation Document scanning drum and flash exposure copier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52119943A (en) * 1976-04-02 1977-10-07 Canon Inc Electrophotographic process and apparatus
JPS5492261A (en) * 1977-12-29 1979-07-21 Konishiroku Photo Ind Co Ltd Destaticizing device in electrophotographic copier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52119943A (en) * 1976-04-02 1977-10-07 Canon Inc Electrophotographic process and apparatus
JPS5492261A (en) * 1977-12-29 1979-07-21 Konishiroku Photo Ind Co Ltd Destaticizing device in electrophotographic copier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6088978A (en) * 1983-10-20 1985-05-18 Konishiroku Photo Ind Co Ltd Electrostatic copying machine
US4529294A (en) * 1984-03-16 1985-07-16 Xerox Corporation Document scanning drum and flash exposure copier

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