JPS58219573A - Printing device - Google Patents

Printing device

Info

Publication number
JPS58219573A
JPS58219573A JP57101360A JP10136082A JPS58219573A JP S58219573 A JPS58219573 A JP S58219573A JP 57101360 A JP57101360 A JP 57101360A JP 10136082 A JP10136082 A JP 10136082A JP S58219573 A JPS58219573 A JP S58219573A
Authority
JP
Japan
Prior art keywords
light
image
photosensitive drum
heat
photoreceptor
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
JP57101360A
Other languages
Japanese (ja)
Inventor
Minoru Isobe
稔 磯部
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP57101360A priority Critical patent/JPS58219573A/en
Publication of JPS58219573A publication Critical patent/JPS58219573A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/04Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/04009Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material by forming an intermediate temporary image projected one or more times

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

PURPOSE:To obtain a printing device small in size and low in cost with a simple constitution, by bringing a thermosensitive film capable of transmitting light by heating, into contact with a photoreceptor, forming a light transmitting image with a thermal head, and forming a latent image on the photoreceptor by light projection. CONSTITUTION:A belt-shaped thermosensitive sheet 18 transmitting no light at normal temp., but capable of transmitting light when heated, and returning to the initial state when cooled is arranged along a photosensitive drum 1, and a thermal head 22, a light source 23, etc. are disposed at prescribed positions. The traveling sheet 18 is heated selectively with the head 22 in accordance with electric signals to form transparent parts 18a, and they are successively formed to obtain a transparent image. The surface of the drum 1 is exposed to light emitted from the source 23 through this transparent image to form a latent image, and it is developed with a toner, thus permitting formation of an inexpensive printing device having a simple constitution.

Description

【発明の詳細な説明】 本発明は電子写真方式による印刷装置に関する。[Detailed description of the invention] The present invention relates to an electrophotographic printing apparatus.

感光ドラムまたは感光シート等の感光体の表面に光照射
によって光潜像を形成し、この光潜像を可視像に現像し
た後、記録紙(普通紙)に転写し、定着させる印刷方式
は電子写真方式として広く知られている。
A printing method that forms a latent optical image on the surface of a photoreceptor such as a photosensitive drum or photosensitive sheet by irradiating it with light, develops this latent image into a visible image, and then transfers it to recording paper (plain paper) and fixes it. It is widely known as an electrophotographic method.

第1図〜第3図はこのような電子写真方式による従来の
印刷装置の代表例を示す概略的な側面図であり、その構
成及び動作を説明する0第1図において1は感光ドラム
で、この感光ドラム1の周囲には帯電器2、トナー3を
収容した現像器4、転写器5、イレーズランプ6、クリ
ーナI及び定着器8が各々所定の位置に配置されている
c9は記録紙で、この記録紙9はスタッカ10内に多数
枚収容されて装置にセットされている011はレーザ光
発生器、12はレーザ光発生器11からの光を走査する
反射ミラーである。
1 to 3 are schematic side views showing a typical example of a conventional printing apparatus using such an electrophotographic method, and the structure and operation thereof will be explained. In FIG. 1, 1 is a photosensitive drum; Around this photosensitive drum 1, a charger 2, a developer 4 containing toner 3, a transfer device 5, an erase lamp 6, a cleaner I, and a fixing device 8 are arranged at predetermined positions. A large number of recording sheets 9 are stored in a stacker 10 and set in the apparatus. 011 is a laser beam generator, and 12 is a reflecting mirror that scans the light from the laser beam generator 11.

この装置は、周知のように感光ドラム1を定速で回転さ
せながらその表面を帯電器2により帯電させ、次いでレ
ーザ光発生器11からの光を図示しない回転手段によっ
て回転する反射ミラー12により走査して感光ドラム1
の表面に光潜像を形成した後、この光潜像に現像器4で
トナー3を付着させて可視像にする0そして更に、この
可視像を図示しない手段によりスタッカ10内から繰出
された記録紙9に転写器5によって転写した後、転写し
た可視像を定着器8により記録紙9に定着させて印刷を
行うもので、可視像転写後感光ドラム1の表面はイレー
ズランプ6により除電され、クリーナ1により残留トナ
ーが取除かれて、次の印刷に備える。
As is well known, this device rotates a photosensitive drum 1 at a constant speed while charging its surface with a charger 2, and then scans light from a laser beam generator 11 with a reflecting mirror 12 rotated by a rotating means (not shown). photosensitive drum 1
After forming an optical latent image on the surface of the optical latent image, toner 3 is applied to this optical latent image by a developing device 4 to form a visible image.Then, this visible image is further fed out from the stacker 10 by means not shown. After the transferred visible image is transferred onto a recording paper 9 by a transfer device 5, the transferred visible image is fixed onto the recording paper 9 by a fixing device 8 to perform printing. The charge is removed by the cleaner 1, and the residual toner is removed by the cleaner 1 in preparation for the next printing.

一方、第2図に示す印刷装置は、感光ドラム1の表面に
光潜像を形成するための光学系として、前記レーザ光発
生器11及び反射ミラー12等の代り、にLEDアレイ
13とセルホックレンズ14等を用いたもので、他は第
1図の場合と同様であるO また、第3図の印刷装置は、光学系として光源15と液
晶(EL) 16とセルホックレンズ11等を用い、液
晶16を光シャッタとして利用して感光ドラム1の表面
に光潜像を形成するもので、他は第1図の場合と同様で
ある。
On the other hand, the printing apparatus shown in FIG. 2 uses an LED array 13 and a cell hook as an optical system for forming an optical latent image on the surface of the photosensitive drum 1, instead of the laser beam generator 11, reflecting mirror 12, etc. The printing device shown in FIG. 3 uses a light source 15, a liquid crystal (EL) 16, a cell-hoc lens 11, etc. as an optical system, and the other parts are the same as those shown in FIG. 1. , the liquid crystal 16 is used as an optical shutter to form an optical latent image on the surface of the photosensitive drum 1, and the other aspects are the same as in the case of FIG.

しかしながらこれら従来の印刷装置は、いずれも感光ド
ラムの表面に光潜像を形成するための光学系が大損りな
ものとなり、しかもレーザ光発生器またはLEDアレイ
、セルホックレンズ等ヲ用いるため高価になZという欠
点があった。
However, in all of these conventional printing devices, the optical system for forming a latent optical image on the surface of the photosensitive drum is a major drawback, and furthermore, they are expensive because they use laser light generators, LED arrays, cell-hoc lenses, etc. There was a drawback called Z.

また、これらの印刷装置は瞬時の光照射により誘導され
る電荷によって感光ドラム表面に光潜像が形成されてか
ら、トナーによる可視像が記録紙に転写されるまでの間
に、前記電荷が拡散して減衰するため、現像時にトナー
が充分に付着しなかったり、現像器の位置から転写器の
位置まで回転する間にトナーが感光ドラムから剥れ落ち
たり、あるいは良好な転写を行うことができなくなる等
の問題があり、これを解消するために感光ドラムに非常
に高い電荷を誘導する必要があると共に、高品質の感光
ドラムを使用しなければならないという欠点もあった。
Furthermore, in these printing devices, the electric charge is generated between the time when a latent optical image is formed on the surface of the photosensitive drum due to the electric charge induced by instantaneous light irradiation and the time when the visible image formed by the toner is transferred to the recording paper. Due to diffusion and attenuation, toner may not adhere sufficiently during development, toner may peel off from the photosensitive drum while rotating from the developing device position to the transfer device position, or it may not be possible to perform good transfer. In order to solve this problem, it is necessary to induce a very high charge on the photosensitive drum, and there is also the disadvantage that a high quality photosensitive drum must be used.

更に上述した各印刷装置では、同一画像を連続的にコピ
ーする場合、1枚毎にデータをレーザ光発生器、LED
アレイまたは液晶を駆動する回路に転送しなければなら
ないという欠点があった。
Furthermore, in each of the above-mentioned printing apparatuses, when copying the same image continuously, the data is sent to a laser light generator or LED for each copy.
The drawback is that it must be transferred to the array or the circuit that drives the liquid crystal.

本発明はこれらの欠点を解決することを目的と1〜、そ
のため、常温では光不透過性であり所定温度以−Lの熱
を加えると光透過性に変化する性質を有しかつ熱可逆性
のある感熱シートと、この感熱シートを局部的に加熱し
て光透過性の画像を形成するサーマルヘッドと、この光
透過性の画像を介して感光ドラムの表面に光を照射する
光源とを使用して光潜像を形成するようにしたことを特
徴とする。
The present invention aims to solve these drawbacks. Therefore, it has the property of being light-opaque at room temperature and changing to light-transmitting when heated above a certain temperature, and thermoreversible. This method uses a heat-sensitive sheet, a thermal head that locally heats the heat-sensitive sheet to form a light-transmitting image, and a light source that irradiates light onto the surface of the photosensitive drum through the light-transparent image. It is characterized in that it forms an optical latent image.

以下図面により説明すると、第4図は本発明の一実施例
を示す概略的な側面図、第5図は第4図の要部拡大図で
、図において1は感光ドラム、2は帯電器、3はトナー
、4は現像器、5は転写器、6はイレーズランプ、1は
クリーナ、8は定着器、9は記鍔紙、10はスタッカで
あり、これらは第1図〜第3図のものと同一である。
To explain the following with reference to the drawings, FIG. 4 is a schematic side view showing one embodiment of the present invention, and FIG. 5 is an enlarged view of the main parts of FIG. 4, in which 1 is a photosensitive drum, 2 is a charger, 3 is a toner, 4 is a developing device, 5 is a transfer device, 6 is an erase lamp, 1 is a cleaner, 8 is a fixing device, 9 is a recording paper, 10 is a stacker, and these are shown in FIGS. 1 to 3. It is the same as the thing.

18はサーモテープと呼ばれる感熱シートで、常温では
光不透過性であり所定温度以上の熱を加えると光透過性
に変化する性質を有し、かつ冷却すると再び元の光不透
過性に戻る熱可逆性のものである。この感熱シート18
はここではエンドレスベルト状に形成されていて、感光
ドラム1に沿っである間隔で配置されたローラ19,2
0と、とのローラ19.20から一定距離だけ離れて配
置された冷却ローラ(イレーズローラ)21に巻掛けら
れており、前記ローラ19と20との間で感光ドラム1
と接触している。
18 is a heat-sensitive sheet called thermo tape, which has the property of being light-opaque at room temperature, changing to light-transmitting when heated above a certain temperature, and returning to its original light-opaque state when cooled. It is reversible. This heat-sensitive sheet 18
is formed here in the form of an endless belt, and rollers 19 and 2 are arranged at certain intervals along the photosensitive drum 1.
The photosensitive drum 1 is wound around a cooling roller (erase roller) 21 that is placed a certain distance away from the rollers 19 and 20 of the photosensitive drum 1.
is in contact with.

22は一ライン型のサーマルヘッドで、前記感熱シート
18に所定の位置で接触するように設けられている。
Reference numeral 22 denotes a one-line type thermal head, which is provided so as to be in contact with the heat-sensitive sheet 18 at a predetermined position.

23は螢光灯等の光源で、感熱シート18の内側に配置
され、ローラ19,20間の感熱シート18を介して感
光ドラム1と対向している。
Reference numeral 23 denotes a light source such as a fluorescent lamp, which is disposed inside the heat-sensitive sheet 18 and faces the photosensitive drum 1 via the heat-sensitive sheet 18 between rollers 19 and 20.

次に上述した構成の動作について説萌すると、まず図示
しない駆動手段により感熱シート18を矢印入方向に移
動させると共に、電気信号によりサーマルヘッド22の
発熱素子を選択的に発熱させて局部的に感熱シート1B
を加熱する。感熱シート18は上述したように常温で光
不透過性すなわち不透明であり、所定以上の熱を加える
と光透過性すなわち透明となるので、前記の如く兄熱素
子によ′:)z 1JJll熱1−7た部分のみが透明
部18aとなり、他の部分は不透明部18bとして残る
。従ってサーマルヘッド22により順次透明部18aを
作り、この透明部18aによる光透過性の画像を形成す
る。
Next, to explain the operation of the above-mentioned configuration, first, the heat-sensitive sheet 18 is moved in the direction of the arrow by a drive means (not shown), and the heating element of the thermal head 22 is selectively heated by an electric signal to locally sense the heat. Seat 1B
heat up. As described above, the heat-sensitive sheet 18 is light-impermeable, that is, opaque, at room temperature, and becomes light-transmissive, that is, transparent, when heat is applied to a predetermined level or more. -7 portion becomes the transparent portion 18a, and the other portion remains as the opaque portion 18b. Therefore, transparent portions 18a are sequentially formed by the thermal head 22, and a light-transmissive image is formed by the transparent portions 18a.

この画像は感熱シート18の移動に伴ってローラ19,
20間に送られ、ここで感光ドラム1と接触する〇 一方、感光ドラム1は感熱シート18に同期をとって、
または所定の制御により矢印B方向に回転し、その表面
は帯電器2により帯電させである。
This image is created by the roller 19 as the heat-sensitive sheet 18 moves.
20, where it comes into contact with the photosensitive drum 1〇Meanwhile, the photosensitive drum 1 is synchronized with the heat-sensitive sheet 18,
Alternatively, it is rotated in the direction of arrow B under predetermined control, and its surface is charged by the charger 2.

そこで前記画像がロー219,20間を通過する際、光
源23からの光が画像を通して感光ドラム1の表面を照
射し、これにより感光ドラム1の表面に前記画像と同一
の光潜像を形成する。
Therefore, when the image passes between the rows 219 and 20, light from the light source 23 illuminates the surface of the photosensitive drum 1 through the image, thereby forming a latent optical image on the surface of the photosensitive drum 1, which is the same as the image. .

この光潜像は現像器4でトナー3が付着されることによ
り可視像となり、この可視像は転写器5によって記録紙
9に転写された後、定着器8で記録紙9に定着される。
This optical latent image becomes a visible image by adhering toner 3 in the developing device 4, and this visible image is transferred onto the recording paper 9 by the transfer device 5, and then fixed on the recording paper 9 by the fixing device 8. Ru.

尚、感熱シート18に形成した画像は冷却ローラ21で
感熱シート18を一定温度以下に冷却することにより消
去することが可能であり、消去後書ヒサーマルヘッド2
2によって新たな画像を形成することができる0 また、同一画像を複数枚連続的にコピーする場合は、感
熱シート18に一度画像を形成した後・図示しない保温
手段で感熱シート18を一定の温度に保っておくことに
より画像をそのまま保持できるため、感熱シート18の
移動と光源23の光の照射を続けるのみで、感光ドラム
1の表面に繰返し同一の光潜像を形成することができる
0以上説明した実施例によると、加熱によって光透過性
に変わる感熱シートと、この感熱シートに光透過性の画
像を形成するだめのサーマルヘッドと、光透過性の画像
が形成された感熱シートを光7ヤツタとして感光ドラム
の表面を照射する光源とを用いて、感光ドラムの表面に
光潜像を形成するようにしているため、構成を簡素化で
きると共に製造も容易となり、かつ感熱シート、サーマ
ルヘッド及び光源は安価なものであるため従来の装置に
比べて製作価格を大幅に低減でき、しかも従来のような
セルホックレンズを用いず、感光ドラムに沿ってこれと
接触する感熱シートを介して光を照射するため、鮮明な
光潜像を形成できるという効果が得られる。
It should be noted that the image formed on the heat-sensitive sheet 18 can be erased by cooling the heat-sensitive sheet 18 to a certain temperature or less with the cooling roller 21, and the image formed on the heat-sensitive sheet 18 can be erased by cooling the heat-sensitive sheet 18 to a certain temperature or lower.
A new image can be formed by 2.0 In addition, when copying multiple copies of the same image continuously, after forming the image once on the heat-sensitive sheet 18, the heat-sensitive sheet 18 is kept at a constant temperature using a heat-retaining means (not shown). Since the image can be maintained as it is by keeping the temperature at 0 or more, the same latent image can be repeatedly formed on the surface of the photosensitive drum 1 by simply continuing to move the heat-sensitive sheet 18 and irradiate the light from the light source 23. According to the described embodiment, a heat-sensitive sheet that becomes light-transmissive by heating, a thermal head for forming a light-transparent image on the heat-sensitive sheet, and a heat-sensitive sheet on which a light-transparent image is formed are exposed to light. A light source that irradiates the surface of the photosensitive drum is used to form a latent optical image on the surface of the photosensitive drum, which simplifies the configuration and facilitates manufacturing. Since the light source is inexpensive, the manufacturing cost can be significantly reduced compared to conventional equipment.Moreover, the light source is transmitted through a heat-sensitive sheet that runs along the photosensitive drum and comes into contact with it, without using a conventional cell-hoc lens. Because of the irradiation, it is possible to form a clear optical latent image.

また、上述した実施例では、感熱シートに形成された光
透過性の画像が1定時間感光ドラムに接触し、この間続
けて光源からの光が前記画像を介して感光ドラムの表面
に照射されるため、光照射時間が長くなり、感光ドラム
表面に誘導された電荷の減衰を少なくすることができる
0そのため感光ドラムの表面に電荷を有効に保持するこ
とかで2 き、これにより良好な現1象、転写を行うこ
とができるので品質の高い印刷を実現できると共に、ラ
フで安価な感光ドラムの使用が可能になるという効果が
得られる。
Furthermore, in the above embodiment, the light-transmissive image formed on the heat-sensitive sheet is in contact with the photosensitive drum for a certain period of time, and during this period, light from the light source is continuously irradiated onto the surface of the photosensitive drum through the image. Therefore, the light irradiation time becomes longer and the attenuation of the charges induced on the photosensitive drum surface can be reduced. Therefore, it is possible to effectively retain the charges on the surface of the photosensitive drum, which results in a good image quality. Since image transfer can be performed, high-quality printing can be achieved, and a rough and inexpensive photosensitive drum can be used.

更に、同一画像を複数枚連続的にコピーする場合、感熱
シートに一度画像を形成すれば、あとは感熱シートの移
動と光源の光の照射を続けるだけで感光ドラム上に繰返
し光潜像を形成できるため、省エネルギでかつ簡易な電
気制御による連続的なコピー印刷が可能になるという効
果が得られるO尚、上述した実施例は感光体が感光ドラ
ム1である場合を1例として述べたものであるが、本発
明は無端状で回転可能に支持された感光シートあるいは
回転ドラムに取外し可能に巻付けられた感光シートを感
光体として用いる装置にも適用できることはいうまでも
ない。
Furthermore, when copying multiple copies of the same image in succession, once the image is formed on the heat-sensitive sheet, a latent photoimage can be repeatedly formed on the photosensitive drum by simply continuing to move the heat-sensitive sheet and irradiating the light from the light source. As a result, it is possible to save energy and perform continuous copy printing using simple electrical control.The above-mentioned embodiment is based on the case where the photoconductor is the photoconductor drum 1 as an example. However, it goes without saying that the present invention can also be applied to an apparatus using an endless rotatably supported photosensitive sheet or a photosensitive sheet removably wound around a rotating drum as a photoreceptor.

また、感熱シート1Bは必ずしもエンドレスに形成した
ものに限られるものではなく、帯状または適当な大きさ
の方形としてマスタシートのように用いるようにしても
上述した実施例と同様の効果を得ることができる。
Further, the heat-sensitive sheet 1B is not necessarily limited to being formed endlessly, and the same effect as in the above-mentioned embodiment can be obtained even if it is used as a master sheet in the form of a strip or a rectangle of an appropriate size. can.

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

第1図〜第3図は従来の印刷装置の代表例を示す概略的
な側面図、第4図は本発明の一実施例を示す概略的な側
面図、第5図は第4図の要部拡大図である。 1・・・感光ドラム 2・・・帯電器 3・・・トナー
4・・・現像器 5・・転写器 8・・・一定着器18
・・・感熱シー)  18a・・・透明部 18b・・
・不透明部 21・・・冷却ローラ 22・・・サーマ
ルヘッド 23・・・光源 特 許 出 願 人  沖覗気工業株式会社代理人  
 弁理士  金 倉 喬  二車10 姻2四
1 to 3 are schematic side views showing a typical example of a conventional printing device, FIG. 4 is a schematic side view showing an embodiment of the present invention, and FIG. 5 is a summary of FIG. It is an enlarged view of the part. 1... Photosensitive drum 2... Charger 3... Toner 4... Developing device 5... Transfer device 8... Constant deposition device 18
...Heat-sensitive sea) 18a...Transparent part 18b...
- Opaque part 21... Cooling roller 22... Thermal head 23... Light source patent applicant Agent: Oki Nozoke Kogyo Co., Ltd.
Patent attorney Takashi Kanakura 10 years old, 24 years old

Claims (1)

【特許請求の範囲】[Claims] l 感光体への光照射によシ感光体の表面に光潜−像を
形成する印刷装置において、常温では光不透過性であり
所定温度以上の熱を加えると光透過性に変化する性質を
有しかつ熱可逆性のある感熱シートと、サーマルヘッド
と、光源とを備え、前記サーマルヘッドにより感熱シー
トを局部的に加熱して光透過性の画像を形成し、この感
熱シートを光シャッタとして感光体に接触させると共に
、前記光源からの光を前記画像を介して感光体の表面に
照射して光潜像を形成することを特徴とする印刷装置0
l In a printing device that forms a latent photoimage on the surface of a photoreceptor by irradiating the photoreceptor with light, it has the property of being light-opaque at room temperature and changing to light-transparent when heated above a predetermined temperature. a thermal head and a light source, the thermal head locally heats the thermal sheet to form a light-transmissive image, and the thermal sheet is used as a light shutter. A printing apparatus 0 characterized in that the printing apparatus 0 is brought into contact with a photoreceptor and irradiates the surface of the photoreceptor with light from the light source via the image to form an optical latent image.
JP57101360A 1982-06-15 1982-06-15 Printing device Pending JPS58219573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57101360A JPS58219573A (en) 1982-06-15 1982-06-15 Printing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57101360A JPS58219573A (en) 1982-06-15 1982-06-15 Printing device

Publications (1)

Publication Number Publication Date
JPS58219573A true JPS58219573A (en) 1983-12-21

Family

ID=14298661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57101360A Pending JPS58219573A (en) 1982-06-15 1982-06-15 Printing device

Country Status (1)

Country Link
JP (1) JPS58219573A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5157011A (en) * 1989-11-17 1992-10-20 Oki Electric Industry Co., Ltd. Thermoreversible recording medium, apparatus utilizing the same and method for fabricating the same
US5237368A (en) * 1989-04-25 1993-08-17 Oki Electric Industry Co., Ltd. Method and apparatus for forming an image with a reversible thermosensitive medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5237368A (en) * 1989-04-25 1993-08-17 Oki Electric Industry Co., Ltd. Method and apparatus for forming an image with a reversible thermosensitive medium
US5157011A (en) * 1989-11-17 1992-10-20 Oki Electric Industry Co., Ltd. Thermoreversible recording medium, apparatus utilizing the same and method for fabricating the same

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