DE2209598B2 - Electrostatic copier forming charge pattern on drum - has set of probes close to drum following immediately after optical projector - Google Patents

Abstract

The image reproduction device or copier includes an optical projection system (3) which produces an image on a drum, and an electrostatic charge pattern corresponding to the projected image. The drum (1) has associated with it an additional recording head (10) and sensor probes (11, 12). The recording head produces an electrostatic charge pattern on the drum (1) in accordance with received signals. The sensor probes serve to transmit the pattern so produced on the information carrier material. The image produced is transferred to roll material (8) which is passed through a developer (5), followed by a fixer (9). There is a transmission device (6) at the point of contact of the roll (8) and the drum (1).

Description

or simultaneously of two or three betreib- ng ^ n ware _{e. kömmiichen Fa] B qThe}

3'Serai according to one of claims 1 to 2, since transmission systems had to

characterized by that the recording medium ^^^ S ^ S (13) Ilhh Ftde

3Serai according to one of claims 1 to, ^^ J ^ SS

characterized by that the recording medium ^^^ S ^ S ^^^ SS ^

ger (13) a layer of insulation a photowjde - Fjm ^ rSä & se dfnn with the utmost care

Stand layer and an electrically conductive sub-arranged uuu ^UI "Wal» p AnfoeynoTn w _P r

l fid Blihtkö it d that 30 a ^^ JH ASS SSSESS:

Stand layer and an electrically conductive g

position having exposure body and that 30 is a ^^ for generating charge images !! a primary den. uaraus charging device as well as devices for the form in the BMdbeMuung at the same time final charging (! 4 ^^ «

" S2ÄÄ one of the claims

characterized in that the scanning device 40 advises for information to be transmitted

nes in electrophotographic copiers

common photosensitive recording media

50 gers generates an electrostatic charge image corresponding to any information, whereupon the in

The invention relates to an apparatus for image transmission contained electric charges charge image are sampled at the means of an optical Projektionsein- by means of a scanning device and transferred to the direction on a recording medium a a transmission, graphic template corresponding electrostatic ₅₅ Optionally, the electrostatic L ^ charge image is generated, which is also developed by means of a development image and the developed image processing device can be developed and transferred to information, as in the case of facsimile transmission under version carriers. turning a light source and a photo tube away

One such device is from the "Electronics World" that can be touched. Furthermore, from the transmitted July 1965, known. The known device makes a copy of the 60 information as a specimen copy common xerography processes. They become.

This reference is also a transmission system It can be used in the combined information

system known in which a graphic template is scanned by means of a processing device recording medium of a cathode ray tube, which is transmitted from a scanned for electrophotographic Verfahr ™ information, processed in the receiver 6 _S common inorganic or organic photos and fed to a cathode ray tube, resistance material in the form a rotatable drum which is formed on a recording medium by a graphical or a revolving endless belt template corresponding electrostatic sheet.

The electrophotographic process used in the present invention can be either a direct process in which the image is copied and fixed directly onto a photosensitive sheet material or an indirect or transfer process the image on a transfer recording material is fixed. However, a method (of the latter type) is preferably used Use in the context of the invention is the most suitable electrophotographic copying process the Carlsonian method described in U.S. Patent 2221776, in which an electrically conductive substrate and a layer of photoresistive material applied thereon Exposure body charged evenly on its surface and then used to form an electrostatic charge image is exposed imagewise. The charge image is then generated by means of a particulate toner developed and fixed with the application of heat or solvents or to fix on paper or the like. Transferred. Another useful electrophotographic transfer method is described in Applicant's U.S. Patent 3438706. In it becomes a one Photoresistive layer and a recording medium covering this insulating layer uniformly charged on its surface formed by the insulating layer and then one imagewise exposure with simultaneous charging with opposite polarity or by means of alternating current corona discharge subject, with a light-dark pattern corresponding to the template forms an electrostatic charge image on the surface. To enhance the contrast of the electrostatic Image, the surface can then be subjected to a total exposure, whereupon the charge image then developed, transferred, and fixed to produce the finished copy. Different other electrophotographic processes are also useful in connection with the invention.

The device according to the invention offers the considerable advantage that information can be obtained through simple Transfer and duplicate application of templates containing them to the template holder permit. The information to be processed by means of the device is not like the conventional information Facsimile technology is limited to certain forms or the like, but can also be three-dimensional Use templates such as books or other objects. Furthermore, the device is in the Able to evaluate electrostatic charge images and convert them into the information to be transmitted Convert signals. There is no special optical system for conveying information required, since the existing system for copying can be used immediately for this, whereby the entire apparatus can be given a compact and simplified structure. Another The advantage is that the conversion of optical images into electrical signals is avoided and the electrical output signals can be generated directly, whereby the occurring in the transmission Let errors be reduced.

With the device according to the invention, incoming information can be copied or reproduced and, if necessary be forwarded immediately. Yet another advantage of the invention is that the outgoing information using the same electrostatic charge image on transfer paper can be transferred, so that you can have a specimen copy for access to the transmitted Information or even several copies of the same he or she keeps.

Embodiments of the invention are in

the following explained with reference to the figures. Show in it Fig. 1 is a schematic representation of a first

Embodiment of a combined device according to

ίο the invention and

Fig. 2 is a schematic representation of a second embodiment of the device, which after another than the electrophotographic process shown in FIG.

The combined image transmission device shown in FIG. 1 contains a rotatable intermediate image carrier Drum 1, furthermore a charger 2. an original holder 3 for projecting a Image of an original through an objective 4 onto the surface of the drum 1, a developing device 5, transmission devices 6, cleaning devices 7, feed devices 8 for Transfer recording paper and a fixing device 9. Furthermore, the device contains a recording

tion device in the form of a recording head 10 for externally received information, a Transmission device for information in the form of a scanning head 11 for scanning the electrostatic Charge image and a scanning and transmission

processing device 12 for the transmission of developed images, and optionally an unloading device.

The combined device can be used for the following purposes:

1. For copying of graphic originals placed on the holder 3 with the process steps of charging, imagewise exposure, developing, Transferring, fixing and cleaning.

2. To record information received via the recording head 10 with the Process steps discharging, recording of a charge image by means of the recording head, developing, transferring, fixing and cleaning, and

3. To transmit the image of a shark Option 3 presented template with the procedural steps

a) Generating the electrostatic charge image, scanning and transmitting the electrostatic charge Charge image, developing, transferring, fixing and cleaning, or

b) Generating the electrostatic charge image, developing, scanning and transmitting the developed toner image, transferring, fixing and cleaning.

The recording of information received and the copying of an original, if necessary also The transmission of information has little to do with the process steps of developing and transmitting Fixing and cleaning together. For the recording of received information there is either; an exposing recording head, for example with a light emitting diode or a cathode ray tube or an electrostatic recorder application. An example of the latter is given below described.

In the electrostatic recording method, depending on how the Ver

step unloading certain mutual Effective relationships between the individual process steps.

Unloading can be done in two different ways, namely once using the method used when copying an original and the other using one of the copying method independent procedural step. For unloading in the first-mentioned way one leads as with the copying process, the charging and exposure are carried out, but with an original for exposure reflective surface is used, so that there is the same effect as a total exposure. Such a reflective surface is usually in the form of a white cover for originals available.

The following process variants are possible for unloading in the latter way:

1. total exposure,

2. Charging with subsequent total exposure or

3. Charging with simultaneous total exposure. The total exposure can be done with an exclusively

additional light source provided for this purpose and charging by means of a special charging device. For simultaneous charging and total exposure are special Facilities required.

In these three variants, the exposure used when copying an original coincides with the light source to illuminate the original, while in variants 1. and 3. also when copying used charging device is not used.

The scanning head used when transmitting information to scan the electrostatic charge image is, for example, an electrometer or the like, which measures the electrostatic charge image electrical outgoing on the surface of the photosensitive recording medium Catches lines of force and the charge image is felt on the basis of the resulting changes in capacity. The probe tip of the head preferably has a diameter of less than 50 μm and is with less than 50 μπι distance from the recording medium arranged.

The above-described arrangement has the following effect in detail: For copying The photosensitive drum 1 is charged from an original by means of the charging device 2. Then the image becomes a template for generating an electrostatic charge image through the lens 4 is projected onto the surface of the drum 1. The charge image is created by means of the developing device 5 made visible and the resulting toner image then from the drum surface to the Surface of a supplied via the supply device 8 Transfer paper web. After fixing the image by means of the fixing device 9 on the The finished copy can be removed from transfer paper. Finally, the recording medium, so the Drum 1, cleaned in preparation for the next copy job.

For making multiple copies of an original the method described above is repeated correspondingly frequently, but in the second and in the following passes, charging and exposure can be omitted, so that only developing takes place and transferring the image without destroying the electrostatic charge image on the drum surface repeated. Cleaning does not need to be done with every run either, but only at the last to be done.

For recording information received from outside, this can be done when copying a Exposure required for the template via the optical devices, that is to say the objective 4, is omitted. at

ίο Use of an electrostatic recording head instead of an exposing head, for example A luminescent diode or a cathode ray tube does not need to be charged either. The direct one Generation of an electrostatic charge image using an electrostatic recording head is described below using an example.

First, residual charges on the drum surface are removed using one of the removed from the following facilities:

l. the charger and

Image exposure devices (2 or 4)
2. the charging device 2 and an additional light source (not shown), or

3. a device (not shown) for

simultaneous exposure and charging.
Subsequently, by means of the recording head 10, an electrostatic charge pattern determined by the information received, for example an image transmitted by telegram, is generated directly on the surface of the rotatable drum 1. For the outgoing transmission of information, either the charge image can be scanned in the copying process before development or, as in conventional processes, the visible image after development. Both the incoming and outgoing information can then be used to produce a specimen copy or multiple copies by developing and transferring the image onto the transfer paper that is also used for copying. After an image has been transferred to the transfer paper, it can be cut to size by means of a cutting device (not shown) depending on the type of image transferred or the amount of information.

the. In the case of transmission devices for images of a predetermined size or for predetermined amounts of information the transfer paper can be used in sheet form instead of in roll form.

As long as the amount of information transmitted in a unit is not greater than the length of the Drum 1 corresponds to, as in the copying process, by repeating the development and the dei Transfer multiple copies in quick succession

be made.

Such a copier, recording and transmission device, in which the copying process for templates and the recording process for received information the essential process rens steps have in common, has the advantage that copies of constant quality can be made on ei ner common transfer paper web can produce and that there is the possibility of detailed! or to quickly duplicate outgoing image information.

The second embodiment of the invention shown in Fig. 2 is based on a different electrophotography look like procedures. The device shown contains

an intermediate image carrier in the form of a rotatable Drum 13, a primary charger 14, a fin device 15 for simultaneous exposure and charging, optionally a total exposure device 17, transmission devices 18, a fixing device 19 and a cleaning device 20. The device also has a recording device 21 for incoming information, a scanning device 22 for scanning the electrostatic Charge image and a scanning device 23 for scanning developed images as well as optionally Unloading devices.

As in the first embodiment, here are the copying method, the recording method and the transmitting method different depending on whether a discharge process is switched on or not feasible, with differences in the recording method only due to of differences in the type of discharge. An essential feature of this embodiment consists in the use of a three-layer recording medium 13. The outermost one The layer of the recording or intermediate image carrier is formed from a highly dielectric material, which has a particularly good holding capacity for electrostatic charges and is therefore special suitable for electrostatic recordings.

In this embodiment of the electrophotographic apparatus, copying involves copying from an original the process steps primary charging, image exposure with simultaneous secondary charging with opposite Polarity or AC corona discharge, total exposure, developing, transferring, Fixing and, if necessary, cleaning of the intermediate image carrier.

The recording of incoming information comprises the process steps of unloading and recording by means of the recording head, developing, transferring. Fixing and, if necessary, cleaning the Intermediate image carrier, and thus proceeds in the same way as in the first embodiment.

The removal of the charge required for the recording of incoming information can be optional be carried out by one of the combinations of process steps listed below.

1. By primary charging with subsequent alternating voltage secondary charging at simultaneous total exposure using a uniform white document cover,

2. By primary charging with subsequent alternating voltage secondary charging at simultaneous total exposure using one in addition to that used when copying existing light source in the optical system,

3. By primary charging, subsequent AC voltage secondary charging with simultaneous image exposure and subsequent AC voltage charging with simultaneous total exposure,

4. Through total exposure with simultaneous alternating voltage discharge, or

5. By alternating voltage discharge with simultaneous or previous image exposure.

Find in the above combinations 1. to 3. the procedural steps that can also be used for copying. It is in the combinations

2. and 3. an additional one not used for copying Light source is present in the optical system or an AC voltage discharge device is used an auxiliary light source is provided. In the 4th and 5th combinations, the primary charger remains Out of service.

There are also other combinations of process steps for removing the charge, such as e.g. B. Primary charging with subsequent secondary charging with opposite polarity and simultaneous Total exposure, which does not need to be described further here. It is enough to hold on that before information is recorded by means of the recording head, the charge in various Combinations of process steps are removed from the intermediate image carrier got to.

In the one described above, after the electrophotographic The copying and recording device operating in a method is, for example, the recording head in the form of an arrangement of recording needles that is customary in facsimile transmission and the like, or it is provided by means of a cable pull movable recording head use.

The combined device is automatic or manual between the different operating modes, so Copy templates, record incoming information or transmit outgoing information Information switchable. Only the necessary facilities are then available when the switch is made of the device in operation while the others are shut down.

When a copy switch is operated, the supply line to the recording device is interrupted, while a connection to the recording devices is established when a recording switch is operated is manufactured to by a facsimile transmission facility or an electronic Data processing system or the like. Incoming information on the recording medium or intermediate image medium to record. Actuation of a record-copy switch enables instantaneous Making copies of the recorded input information. Accordingly, the Pressing a transmission switch, the transmission and, if necessary, the production of copies of the outgoing information. In this way, information can be automatically received, recorded, transmitted and / or copied or reproduced.

Furthermore, the combined copier and recording device can be set to a "priority recording" mode of operation. set at which it is immediately at the beginning of the receipt or reception of information automatically switches to »recording« even during a copying process, to when finished of the recording process to resume copying in response to a signal indicating this. In the same way, the device can also be switched to "Copy priority". the The possibility of such »priority switching« represents a further advantage of the combined device for the processing of information.

It is also possible to copy and record and / or copy and transmit information combine with each other in such a way that a certain processing or processing of the Information results. In this way, outgoing information

609519/470

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tion can be given a title or consecutively numbered depending on the recipient's wishes, and next to When incoming information is recorded, response information can be transmitted and copied at the same time or be reproduced.

The exemplary embodiments of the device shown in the drawing each have the copying devices as well as the receiving and transmitting devices common paper feeding device

10

gen on. However, for any given purpose, the copier and receiver devices or paper feed devices common to the copier and transmission devices are sufficient be. However, a description of such arrangements is not required here, as they are by simply omitting the receiving or transmitting devices in FIGS. 1 and 2 of self surrender.

For this purpose 2 sheets of drawings

Claims (1)

ι 2 dTsbderuTA.gtPatentschrift 3479451_ is an information patent claims: mationsübergangssystera known in which the loading • ~ ι nodding an information carrier (paper) of two 1. Device for image transmission, from which is seen by means of iSi. For this purpose, two of a projection optical system on a * e £ "* _{he ra} present, wherein on a recording medium a a graphical pre Auize> * _{r a} ieroberseite _{for the} p _ap coverings corresponding electrostatic charge image JjUiwi S _tros f * _ated charge image and on which it is generated, the buffing means of a development facilities _{"a FTIR the Papiemnter} direction developable. and electrostatic a information ^Ε" ^ η ■ _tes charge image is ertionsträger transferable, characterized ge ISIN serte ^ _generating records of these charge images that in addition a recording head ^. ^ cathode ray tube _in connection with mirror (10,21) and / or scanning device (11, 12; 22, ^ ™ ^ and deflection circuits. 23) are provided, the recording & ™ ° ™ ™ & ™ _{Hcn Auslegeschrift} 1900635 is a head em corresponding to a received signal- ^ V ^ ßildabtast- und Bildaufnahmvorrichtes electrostatic charge image on the recording ¹ S KomDuiiciic Drawing carrier (1 13) generated and the scanning "^" ^^ the processing and transmission device that _{has mation} on the record carrier J% X ^e au a combination! existing Bdd for the purpose of transfer; _b £ ⁿ ^ _n ^ _{erm entities} covered receivers rSät according to claim!, characterized - ^ SrSSSSSS ^^ indicates that the projection device (4, 15), getunaen, unu u J> transmission and