JPH0330511B2 - - Google Patents
Info
- Publication number
- JPH0330511B2 JPH0330511B2 JP56007037A JP703781A JPH0330511B2 JP H0330511 B2 JPH0330511 B2 JP H0330511B2 JP 56007037 A JP56007037 A JP 56007037A JP 703781 A JP703781 A JP 703781A JP H0330511 B2 JPH0330511 B2 JP H0330511B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- light valve
- light source
- signal
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000004973 liquid crystal related substance Substances 0.000 claims description 85
- 210000002858 crystal cell Anatomy 0.000 claims description 14
- 230000004044 response Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 6
- 108091008695 photoreceptors Proteins 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000004298 light response Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/465—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using masks, e.g. light-switching masks
Description
【発明の詳細な説明】
本発明の印写装置、より詳しくは液晶セルを用
いた印写装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing apparatus, and more particularly to a printing apparatus using a liquid crystal cell.
近来、CPUやメモリ等の低価格化が進み、マ
イコンやオフコンが普及するにつれて、その出力
装置であるプリンタに漢字や図形を印写するため
の高解像力・高速印写性を要求する様になつてい
る。このためのプリンタとして、液晶ライトバル
ブを備えた液晶プリンタ（液晶シヤツタープリン
タ、LCS（Liquid Crystal Shutter）プリンタと
称することもある）（特願昭55−141085）が出願
されている。第１図には、その液晶プリンタの構
成を示す。液晶プリンタに於て毎分10枚の高速印
写を行なうためには、光源１１、集光光学系１
２、液晶ライトバルブを備えた液晶セル１３、結
像光学系１４、感光体１５からなる光書き込み静
電潜像形成部の光エネルギーを充分に供給するこ
とが必要であり、結像光学系に明るいレンズ、高
感度感光体を用いることは勿論のこと、光源から
発生する光エネルギーを充分に得ることが必要で
ある。 In recent years, as the prices of CPUs, memory, etc. have become lower, and microcomputers and office computers have become more widespread, printers, which are their output devices, are required to have high resolution and high-speed printing capabilities to print kanji and figures. ing. As a printer for this purpose, a liquid crystal printer (sometimes referred to as a liquid crystal shutter printer or LCS (Liquid Crystal Shutter) printer) equipped with a liquid crystal light valve (Japanese Patent Application No. 141,085/1982) has been filed. FIG. 1 shows the configuration of the liquid crystal printer. In order to perform high-speed printing of 10 sheets per minute in a liquid crystal printer, a light source 11 and a condensing optical system 1 are required.
2. It is necessary to supply sufficient light energy to the optical writing electrostatic latent image forming section, which consists of a liquid crystal cell 13 equipped with a liquid crystal light valve, an imaging optical system 14, and a photoreceptor 15. It is necessary not only to use a bright lens and a highly sensitive photoreceptor, but also to obtain sufficient light energy generated from a light source.
なお、図中、１５−１は帯電器、１５−２は現
像器、１５−３は転写器１５−４はクリーナー、
１５−５は定着器であり、１６は液晶セル１３を
駆動する駆動回路である。 In the figure, 15-1 is a charger, 15-2 is a developer, 15-3 is a transfer device, 15-4 is a cleaner,
15-5 is a fixing device, and 16 is a drive circuit for driving the liquid crystal cell 13.
このための従来の一般的な光源として、ハロゲ
ンランプは高エネルギーを放射するが、消費電力
が大きすぎ、小型低電力動作の装置には不向きで
ある。このため、これを類似した状況にある複写
機に於ては、原稿照射のために蛍光灯を用いてい
る。複写機に於ては原稿面照度を高めるために第
２図に構造を示す蛍光灯を使用し、管球ガラス２
４内に設けた水銀発光スペクトルにより励起され
る蛍光体層２１から生ずる光を反射層２２により
反射集光し、管壁の一部の透明窓（アパーチヤ
ー）２３より放出し、約90度の広いアパーチヤー
角により高い光束発散性能を有している。これに
対して、液晶プリンタに於ては、静電潜像を形成
するための液晶セルの光のスイツチング用ドツト
を構成する各液晶ライトバルブが約100μｍと小
さく、かつ結像レンズと共に有効な光の入射角度
が小さいことから、光源には高光束発散性能では
なく、高密度光エネルギー放出特性即ち高輝度特
性が必要となる。このため、蛍光灯光源において
アパーチヤー角度を狭くして、高輝度点灯するこ
とも考えられるが、このようにすると光源が高温
となり液晶セルを温度に高温にして液晶セルを劣
化させる蛍光燈を光源として使用することによる
悪影響をより助長するばかりでなく、蛍光体や反
射層を急速に劣化させ短時間で輝度低下を招いて
しまう。 As a conventional and common light source for this purpose, halogen lamps emit high energy, but consume too much power, making them unsuitable for small, low-power operating devices. For this reason, copying machines in a similar situation use fluorescent lamps to illuminate documents. Copying machines use fluorescent lamps, the structure of which is shown in Figure 2, to increase the illuminance on the document surface, and the tube glass 2
Light emitted from the phosphor layer 21 excited by the mercury emission spectrum provided in the tube wall is reflected and focused by the reflective layer 22, and emitted from a transparent window (aperture) 23 in a part of the tube wall, forming a wide window of about 90 degrees. It has high luminous flux divergence performance due to its aperture angle. On the other hand, in a liquid crystal printer, each liquid crystal light valve that constitutes the light switching dot of the liquid crystal cell to form an electrostatic latent image is as small as approximately 100 μm, and together with the imaging lens, it is necessary to Because the incident angle of the light source is small, the light source is required to have high-density light energy emission characteristics, that is, high brightness characteristics, rather than high luminous flux divergence performance. For this reason, it is conceivable to narrow the aperture angle of a fluorescent lamp light source and turn it on at high brightness, but if you do this, the light source will become hot and the temperature of the liquid crystal cell will rise to a high temperature, causing the liquid crystal cell to deteriorate. Not only does its use further exacerbate the negative effects, but it also rapidly deteriorates the phosphor and reflective layer, leading to a reduction in brightness in a short period of time.
本発明はかかる欠点を除去し、蛍光燈のように
高温になりやすい光源を使用した場合でも、温度
上昇をおさえることができ、しかも明るい照射光
により鮮明な印写を行なうことのできる印写装置
を提供できることを目的とする。 The present invention eliminates such drawbacks and is capable of suppressing temperature rise even when using a light source that tends to reach high temperatures, such as a fluorescent light, and is capable of producing clear prints using bright irradiation light. The purpose is to provide the following.
かかる目的に鑑み、本発明の印写装置は、光源
と、前記光源から出射される光を選択透過する液
晶ライトバルブを設けた液晶セルと、前記液晶ラ
イトバルブの開閉を制御する液晶ライトバルブ駆
動回路とを備えた印写装置において、
前記液晶ライトバルブ駆動回路の前記液晶ライ
トバルブ駆動信号と同期をとつて遅延させ前記液
晶ライトバルブの光透過応答特性に対応させて遅
延させて前記光源を駆動する前記光源駆動手段を
備えたことを特徴とする。 In view of this object, the printing apparatus of the present invention includes a light source, a liquid crystal cell provided with a liquid crystal light valve that selectively transmits light emitted from the light source, and a liquid crystal light valve drive that controls opening and closing of the liquid crystal light valve. and driving the light source in synchronization with and delaying the liquid crystal light valve drive signal of the liquid crystal light valve drive circuit and delaying the signal in accordance with the light transmission response characteristic of the liquid crystal light valve. The present invention is characterized by comprising the light source driving means.
例えば、光源として狭角アパーチヤー型蛍光燈
を使用し、この光源を液晶セルの液晶ライトバル
ブの駆動周波数と同期させて、光源の駆動周波数
と同じ駆動周波数で駆動させ、光源の駆動信号を
液晶ライトバルブの光透過応答特性に対応させて
遅延させた信号により液晶ライトバルブを駆動さ
せる。光源をこのように駆動させて、液晶ライト
バルブを駆動させ、液晶ライトバルブの開時に光
源を明るく点灯させ、立ち下がり（閉）時に光源
たる蛍光燈を低輝度点灯、あるいは非点灯状態と
することにより、鮮明な印写を可能とすると共
に、蛍光燈の点灯デユーテイを低下させることに
より光源たる蛍光燈の高温発熱や、急速な劣化を
防ぐことができる。 For example, a narrow-angle aperture type fluorescent lamp is used as a light source, and this light source is synchronized with the driving frequency of the liquid crystal light valve of the liquid crystal cell, and is driven at the same driving frequency as the driving frequency of the light source. The liquid crystal light valve is driven by a signal delayed in accordance with the light transmission response characteristics of the valve. By driving the light source in this way, the liquid crystal light valve is driven, and when the liquid crystal light valve opens, the light source lights up brightly, and when the liquid crystal light valve falls (closed), the fluorescent lamp, which is the light source, lights up at low brightness or is not lit. This enables clear printing, and by reducing the lighting duty of the fluorescent lamp, it is possible to prevent the fluorescent lamp as a light source from generating high temperature heat and from rapid deterioration.
また、他の印写装置の例としては、光源、液晶
セル、液晶駆動回路を有する光信号発生部、感光
部、現像部、定着部を含む光印写装置を構成し、
該液晶セルは、少なくとも１本の共通信号電極を
備えるガラス基板と複数個の選択信号電極を備え
るガラス基板を対向させその間に液晶組成物を封
入して成る液晶パネルの両側に２枚の偏光板を備
え、かつ上記液晶組成物は誘電異方性がゼロにな
る交差周波数が常温で100KHz以下であるネマチ
ツク液晶に光学活性物質を添加してなる液晶組成
物であり、さらに上記共通信号電極と上記選択信
号電極の間に、交交周波数より高い周波数の信号
と交差周波数より低い周波数の信号を印加するこ
とにより上記液晶セルのライトバルブを開閉する
駆動回路を備え、さらに液晶ライトバルブの駆動
回路より出力される液晶ライトバルブの駆動信号
の遅延信号により、液晶ライトバルブの光学応答
と同期させ光源を点灯させる光源駆動回路を備え
たものがある。 Further, as an example of another printing device, an optical printing device including a light source, a liquid crystal cell, an optical signal generating section having a liquid crystal driving circuit, a photosensitive section, a developing section, and a fixing section,
The liquid crystal cell includes two polarizing plates on both sides of a liquid crystal panel consisting of a glass substrate with at least one common signal electrode and a glass substrate with a plurality of selection signal electrodes facing each other and a liquid crystal composition sealed between them. , and the liquid crystal composition is a liquid crystal composition obtained by adding an optically active substance to a nematic liquid crystal whose crossover frequency at which the dielectric anisotropy becomes zero is 100 KHz or less at room temperature, and further includes the common signal electrode and the above. A drive circuit is provided between the selection signal electrodes to open and close the light valve of the liquid crystal cell by applying a signal with a frequency higher than the cross frequency and a signal with a frequency lower than the cross frequency, and further output from the drive circuit of the liquid crystal light valve. Some devices are equipped with a light source drive circuit that lights up the light source in synchronization with the optical response of the liquid crystal light valve using a delay signal of the drive signal of the liquid crystal light valve.
実施例
本発明の印写装置は、前述した第１図に示す印
写装置たる液晶プリンタをさらに改良せんとする
ものであり、光源駆動部を除いては第１図と同様
の構成をとる。Embodiment The printing apparatus of the present invention is intended to further improve the liquid crystal printer, which is the printing apparatus shown in FIG.
本発明の印写装置は、液晶ライトバルブの駆動
と、光源の駆動とが密接な関係を有する。 In the printing apparatus of the present invention, the driving of the liquid crystal light valve and the driving of the light source are closely related.
このため、第３図の液晶ライトバルブの駆動回
路図と、第４図の液晶ライトバルブの光透過率応
答特性及び駆動波形説明図及び第５図の光源駆動
回路を使つて説明する。液晶ライトバルブの駆動
回路は第３図ａに示す構成をとり、その駆動信号
はｂに示すものである。文字等のパターン発生回
路３０１からシフトレジスタ３０２に文字等の印
写情報が送られるが、このタイミングは制御信号
発生器３０４で制御される。この信号が３０８に
示したシフト信号である。シフトレジスタ３０２
からラツチ回路３０３に情報が送られるラツチさ
れるが、このラツチ信号は制御信号発生器３０４
から出された３０９の信号である。制御信号発生
器はシフトレジスタ３０２やラツチ回路３０３を
制御するが、この制御信号発生器３０４からに示
す液晶駆動クロツク信号Ｃ３１０を受けて、これ
と同期をとつて液晶ライトバルブ開閉信号発生器
３０５が作動する。そして、液晶は３１１に示す
信号で駆動される。３１１に示す信号波形は液晶
ライトバルブ“開”信号である。なお、液晶ライ
トバルブ“閉”信号は312に示すような信号であ
る。 For this reason, explanation will be given using the drive circuit diagram of the liquid crystal light valve shown in FIG. 3, the light transmittance response characteristic and drive waveform explanatory diagram of the liquid crystal light valve shown in FIG. 4, and the light source drive circuit shown in FIG. The driving circuit for the liquid crystal light valve has the configuration shown in FIG. 3a, and its driving signal is shown in FIG. 3b. Print information such as characters is sent from a character pattern generation circuit 301 to a shift register 302, and the timing of this is controlled by a control signal generator 304. This signal is the shift signal shown at 308. shift register 302
The latch signal is sent to the latch circuit 303 from the control signal generator 304.
This is the 309 signal issued from. The control signal generator controls the shift register 302 and the latch circuit 303, and upon receiving the liquid crystal drive clock signal C310 shown in the figure from the control signal generator 304, the liquid crystal light valve opening/closing signal generator 305 operates in synchronization with this signal. Operate. Then, the liquid crystal is driven by a signal shown at 311. The signal waveform shown at 311 is a liquid crystal light valve "open" signal. Note that the liquid crystal light valve "close" signal is a signal as shown at 312.
この信号により液晶ライトバルブが駆動される
様子を示したものが第４図ａ，ｂである。第４図
ｂは液晶ライトバルブの駆動波形であるが、１周
期T1で駆動される。最初のT2間に高周波数が印
加されると液晶ライトバルブは開き、低周波が印
加されると閉じる。図では高周波が印加されバル
ブが開いている。また、T3間では必ず低周波駆
動信号が印加され、液晶の累積的、蓄積的な応答
不良を防止する。第４図ａはこの駆動波形に対応
した液晶ライトバルブの透過応答特性を示す。こ
れから明らかなように、駆動波形に対して、透過
応答特性は液晶の物理変化による時間的な遅れが
あり、更に立ち上がり、立ち下がりの時間的遅れ
を有する。この立ち上がり、立ち下がりに於て
は、光の透過率が全開の時に比して少ないため、
光源は常時高輝度点灯するよりも、透過率応答に
応じて光源に輝度変調をかけ、光源光エネルギー
の最適効率化をはかることができる。つまり、液
晶ライトバルブの駆動信号と同期させて、これを
遅延させ、液晶ライトバルブの光学的応答を同期
をとるように遅延させた信号により光源を駆動点
灯させることにより、液晶のライトバルブの照明
を低消費電力で効率的に行なうことができる。 Figures 4a and 4b show how the liquid crystal light valve is driven by this signal. FIG. 4b shows the driving waveform of the liquid crystal light valve, which is driven in one period T1 . The liquid crystal light valve opens when a high frequency is applied during the first T 2 and closes when a low frequency is applied. In the figure, high frequency is applied and the valve is open. Additionally, a low frequency drive signal is always applied between T3 to prevent cumulative and accumulative poor response of the liquid crystal. FIG. 4a shows the transmission response characteristics of the liquid crystal light valve corresponding to this driving waveform. As is clear from this, the transmission response characteristic has a time delay with respect to the drive waveform due to physical changes in the liquid crystal, and also has a time delay in rising and falling. During this rise and fall, the light transmittance is lower than when it is fully opened, so
Rather than constantly turning on the light source at high brightness, the light source can be modulated in brightness according to the transmittance response to optimize the efficiency of the light source light energy. In other words, by synchronizing and delaying the driving signal of the liquid crystal light valve, and driving and lighting the light source with the delayed signal to synchronize the optical response of the liquid crystal light valve, the liquid crystal light valve is illuminated. can be performed efficiently with low power consumption.
このための、蛍光燈光源の駆動回路を第５図に
示す。これは、蛍光燈光源の駆動回路の点灯非点
灯駆動信号を液晶ライトバルブの光応答特性と同
期させるべき、蛍光燈光源駆動回路の入力信号と
して、第３図の印写装置駆動回路の印写（書き込
み）の制御信号発生器３０４の出力である液晶ラ
イトバルブ開閉制御信号Ｃ３１０を用い、この信
号を遅延する遅延回路５１により液晶ライトバル
ブの光応答の遅延と同期をとり、これを駆動デユ
ーテイ変換回路（ワンシヨツトマルチバイブレー
タを使用）５２によつて光源たる蛍光燈を適当な
駆動デユーテイで駆動する変号に変換し、アンプ
５３で増幅し、昇圧回路５４で昇圧し、光源たる
蛍光燈５５駆動に必要な電圧にして光源点灯をお
こなう。なお、遅延回路５１は、いわゆる遅延素
子やシフトレジスタ等、周知のものでよい。 A driving circuit for the fluorescent lamp light source for this purpose is shown in FIG. This is used as the input signal for the fluorescent light source drive circuit, which should synchronize the on/off drive signal of the fluorescent light source drive circuit with the light response characteristics of the liquid crystal light valve. Using the liquid crystal light valve opening/closing control signal C310, which is the output of the (writing) control signal generator 304, the delay circuit 51 that delays this signal synchronizes with the delay in the light response of the liquid crystal light valve, and converts this into a driving duty. A circuit (using a one-shot multivibrator) 52 converts a fluorescent lamp as a light source into a decoded signal driven with an appropriate drive duty, amplifies it in an amplifier 53, boosts the voltage in a booster circuit 54, and drives the fluorescent lamp 55 as a light source. The light source is turned on with the voltage required. Note that the delay circuit 51 may be a well-known one such as a so-called delay element or a shift register.
このような回路により、液晶ライトバルブの駆
動周波数を500Hzとして、感度4Lux・secのSe感
光体に光書き込みを行なつた。光源としては、開
口部が約２mmの線状である狭角アパーチヤーによ
るアルミン酸塩蛍光燈を用い、液晶ライトバルブ
の駆動周波数と同じ500Hz、点灯デユーテイ50％
（１未満の駆動デユーテイ）で駆動した。蛍光燈
の点灯輝度は15×104Cd／m2であり、鮮明な印写
に十分であつた。そして、感光体上に５cm／sec
の光書き込み速度で書き込みを行なつても、鮮明
な印写が可能な静電潜像を得た。これは、A4判
紙毎分10枚の記録速度を有するもので、従来の普
及タイプのメカニカルプリンタの約10倍の光束印
写性能を有するものである。 Using such a circuit, optical writing was performed on the Se photoreceptor with a sensitivity of 4 Lux·sec while the driving frequency of the liquid crystal light valve was 500 Hz. The light source is an aluminate fluorescent lamp with a linear narrow-angle aperture of about 2 mm, and the driving frequency is 500 Hz, which is the same as the driving frequency of the liquid crystal light valve, and the lighting duty is 50%.
(drive duty less than 1). The lighting brightness of the fluorescent light was 15×10 4 Cd/m 2 , which was sufficient for clear printing. Then, 5cm/sec on the photoreceptor.
Even when writing was performed at an optical writing speed of 1, an electrostatic latent image that could be clearly printed was obtained. This printer has a recording speed of 10 sheets per minute of A4 size paper, and has approximately 10 times the luminous flux printing performance of conventional, popular mechanical printers.
なお、このように、光源（蛍光燈）の駆動波形
は、液晶ライトバルブの駆動と同期させて、その
周波数500Hzと同じ500Hzの短形波で駆動させても
よいが、この光源（蛍光燈）駆動用点灯波形を更
に高周波変調することで更に点灯輝度を高めるこ
ともできる。 In this way, the driving waveform of the light source (fluorescent lamp) may be synchronized with the driving of the liquid crystal light valve and driven with a rectangular wave of 500 Hz, which is the same frequency as that of the liquid crystal light valve, but this light source (fluorescent lamp) The lighting brightness can be further increased by further modulating the driving lighting waveform at a higher frequency.
以上述べた本発明の印写装置によれば、蛍光燈
のような高温になりやすい光源を使用した場合で
も温度上昇をおさえることができ、しかも明るい
照射光により鮮明な印写をおこなうことができ
る。また、狭角アパーチヤー型蛍光燈のように高
輝度発光するが急速に劣化しやすい光源を使用し
た場合であつても発光輝度の劣化が防止できる。
また液晶分子の物理的変化を利用するため、電気
的変化に対して応答速度の遅い液晶ライトバルブ
により光の書き込みを行なう場合であつても、液
晶駆動と同期をとり、かつ遅延をさせて光源駆動
をおこなうことにより、液晶ライトバルブの光透
過率が最大になつたときに光照射をおこなうこと
ができ、光書き込みの光選択透過率をきわめて高
めることもできる。 According to the above-described printing apparatus of the present invention, even when using a light source that tends to reach high temperatures, such as a fluorescent light, temperature rise can be suppressed, and clear printing can be performed using bright irradiation light. . Further, even when using a light source such as a narrow-angle aperture type fluorescent lamp that emits high-intensity light but easily deteriorates rapidly, it is possible to prevent the luminance from deteriorating.
In addition, since physical changes in liquid crystal molecules are used, even when writing light with a liquid crystal light valve that has a slow response speed to electrical changes, the light source can be synchronized with the liquid crystal drive and delayed. By driving, light irradiation can be performed when the light transmittance of the liquid crystal light valve reaches its maximum, and the light selective transmittance of optical writing can be extremely increased.
第１図は本発明の印写装置の原理構成を示す
図。第２図は、従来の複写機用蛍光灯を示す図
で、ａは外観図、ｂは断面構造図。第３図は本発
明の印写装置の液晶ライトバルブの駆動回路図及
びタイミングチヤート。第４図ａ，ｂはそれぞれ
本発明の印写装置に用いる液晶ライトバルブの透
過率応答図及び駆動波形図。第５図は本発明の印
写装置に用いる光源（蛍光燈）駆動回路図。
１１……光源、１２……集光レンズ、１３……
液晶セル、１４……結像レンズ、１５……感光ド
ラム、１５−１……帯電器、１５−２……現像
器、１５−３……転写放電器、１５−４……クリ
ーナー、１５−５……定着器、１６……液晶ライ
トバルブ駆動回路、２１……蛍光体、２２……反
射層、２３……透明窓（アパーチヤー）、３０１
……印写パターン発生器、３０２……シフトレジ
スタ、３０３……ラツチ回路、３０４……制御信
号発生器、３０５……ライトバルブ開閉信号発生
器、３０６……ドライバー、３０７……液晶セ
ル、３０８……シフト信号、３０９……ラツチ信
号、３１０……液晶駆動クロツク信号、３１１…
…液晶ライトバルブ“開”信号、３１２……液晶
ライトバルブ“閉”信号、５１……遅延回路、５
２……デユーテイ変更回路、５３……アンプ、５
４……昇圧回路、５５……蛍光灯光源。
FIG. 1 is a diagram showing the basic configuration of a printing apparatus according to the present invention. FIG. 2 is a diagram showing a conventional fluorescent lamp for copying machines, in which a is an external view and b is a cross-sectional structural view. FIG. 3 is a driving circuit diagram and timing chart of the liquid crystal light valve of the printing apparatus of the present invention. FIGS. 4a and 4b are a transmittance response diagram and a drive waveform diagram, respectively, of a liquid crystal light valve used in the printing apparatus of the present invention. FIG. 5 is a light source (fluorescent lamp) drive circuit diagram used in the printing apparatus of the present invention. 11... Light source, 12... Condensing lens, 13...
Liquid crystal cell, 14...imaging lens, 15...photosensitive drum, 15-1...charger, 15-2...developing device, 15-3...transfer discharger, 15-4...cleaner, 15- 5... Fixing device, 16... Liquid crystal light valve drive circuit, 21... Phosphor, 22... Reflective layer, 23... Transparent window (aperture), 301
...Print pattern generator, 302...Shift register, 303...Latch circuit, 304...Control signal generator, 305...Light valve opening/closing signal generator, 306...Driver, 307...Liquid crystal cell, 308 ...Shift signal, 309...Latch signal, 310...Liquid crystal drive clock signal, 311...
...Liquid crystal light valve "open" signal, 312...Liquid crystal light valve "close" signal, 51...Delay circuit, 5
2...Duty change circuit, 53...Amplifier, 5
4...Boost circuit, 55...Fluorescent lamp light source.
Claims (1)
過する液晶ライトバルブを設けた液晶セルと、前
記液晶ライトバルブの開閉を制御する液晶ライト
バルブ駆動回路とを備えた印写装置において、 前記液晶ライトバルブ駆動回路の前記液晶ライ
トバルブ駆動信号と同期をとつて遅延させ前記液
晶ライトバルブの光透過応答特性に対応させて遅
延させて前記光源を駆動する前記光源駆動手段を
備えたことを特徴とする印写装置。[Scope of Claims] 1. A sign comprising a light source, a liquid crystal cell provided with a liquid crystal light valve that selectively transmits light emitted from the light source, and a liquid crystal light valve drive circuit that controls opening and closing of the liquid crystal light valve. In the photographic apparatus, the light source driving means drives the light source in synchronization with the liquid crystal light valve driving signal of the liquid crystal light valve driving circuit, and delays the liquid crystal light valve driving signal in accordance with a light transmission response characteristic of the liquid crystal light valve. A printing device characterized by comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56007037A JPS57120462A (en) | 1981-01-19 | 1981-01-19 | Printer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56007037A JPS57120462A (en) | 1981-01-19 | 1981-01-19 | Printer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57120462A JPS57120462A (en) | 1982-07-27 |
| JPH0330511B2 true JPH0330511B2 (en) | 1991-04-30 |
Family
ID=11654836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56007037A Granted JPS57120462A (en) | 1981-01-19 | 1981-01-19 | Printer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57120462A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017419A (en) * | 1983-07-08 | 1985-01-29 | Canon Inc | Image forming device |
-
1981
- 1981-01-19 JP JP56007037A patent/JPS57120462A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57120462A (en) | 1982-07-27 |
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