DE1810076A1 - Electrostatic writing device - Google Patents

Description

Electrostatic writing device

The invention "relates to an electrostatic Sohreibvorriohtung, that works with corona discharge.

An electrostatic writing process is already known, daa can be referred to as a corona template. In this procedure, a corona cloud or corona cloud is formed Ions selectively generated and directed against a suitable dielectric recording medium. This is on its opposite to the corona source with a counter-

t ■

Electrode provided - which is polarized such that ions one be3timr.iten polarity. Between the record carrier and the ICorona source is a conductive © * Stencil or mask arranged with character-shaped Openings is provided. The Quersclinitt of the one of these openings directs the recording medium

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The corona curvature corresponds to the characters shown in each case opening. Me in i'omi of an ao auagebildeneu corona flow attracted ions are deposited on eggs of the recording medium, creating a latent electrostatic charge pattern results, because of the usual xerographical development and axing processes are visible. and made permanent "can be»

The template used can be of different shapes v / ie e.g. the oines endless_Bandeg, a rotating one l'romiiiel or a slice. Since the ncliriftzeiohenfönuigen openings are fixed in their position, can I also get the corresponding writings. to come to terms. If other symbols are used, see below a new template must be made and inserted into the appropriate device,

Φ _ _.._ ■ i ^.: ■■■ ■. ' . ■; ■. ■ ■;

Also for recording digital facsimile information another device must be used.

The object of the invention is therefore * the electrostatic To improve recording by corona discharge in such a way that that without "delay or major changes any kind of characters or symbols can be written. So an electrostatic visual display should be

riohtung be created, ie with the alphanumeric aov ^/: · "- · atifgezeiohnetwerden and digital #aksimiifinfprmationen '

• iöitti / 1536 BAD-OftlÖINAL

and which is simple and compact ^{4 at} the same time.

The Lösmv: this task ordered in an electrostatic Üdj rubbing device, d. '. E see according to the invention by at least one straight electrode that is at a distance a ü-egen-eielctrode assigned 13t, through one with at least one an Ivoronaeiitladunf: eri-Ögliclienden opening with at least εν ei lead parallel to each other that are transverse to Lingary to the electrode, provided egg loosely aielektrisciies JJand that with a transport device between electrode and counter-electrode .beviegt v; ird, and by a t> ii, iialgeber, dei * with the electrodes electrically ■;.; Eko-ppolt and a corona discharge through the opening of the tape through.

3) the coronaeiitludunccKouelle kcj.111 a number. -lit. , 'l ^ iclien ÄbiJ-taitQ zueinanler c.:.i _o ^- eci * diietex' contain conductors that are selectively connected in pulse form and a corona discharge: ü: i XiLiIUU zv.'isclieii den -electrodes utid de— jevieils controlled Head of bev / irkeii. In doing so, the opening of the bay is moved in one direction parallel to the ladder.

Din ..besseres 7-firsti-indnis of the Brx'indunj so; ie their further v / esensz ^ ce and '/ orteile results from the following detailed description of an example Land of the ÄJiirai. 130 soaps:

909828/1536 ^Construction ORiginai

Pig. 1 is a perspective view of an electroutatic writing device designed according to the invention. or direction,. .

Pig, 2 shows a cross section of the recording area of the writing device according to the invention,

Pig. 5 the type of recording of alphanumeric information according to the invention,

! '' ig. 4 shows the block diagram of a switching device that can be used to control the writing device according to the invention. tung and

Pig. 5A-0 typical control impulses with. the one in Pig. 4 can be generated.

In Pig. 1 and 2 the writing device according to the invention is shown. A dielectric tape 2 is fed through a recording area over two idle rollers 4 in a direction indicated by the arrow. This tape 2 is stretched and can be moved step by step, for example with a motor and a coupling device In the invention, it is only essential that such a drive combination keeps the belt in rest position during a friction process and carries out a step movement between the friction processes a period t takes place which is slightly longer than the time required for a write operation, '' ι -./-. \. ■■: .. - _;: ./; '. '■'.

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¹ '' iTHijöF ι! ■ ,; ":!«! I !!! J | j: ii! (! ["If i '" 5 ¹ I ^ ^{l] m}

1810078

Aufzeiohjumgsband 2 can do the usual xerogrufflachen Developing and fusing devices go through which the Just in Pig. 1 not shown oind and do not form a specific ϊβϋ of the invention.

The dielectric belt 2 can si oh in contact with a ($ Jegeiielektrode are _t Oine Greiiafluohe a corona "· entludungoraumoe at the Aufzeiclinungoateile forms. The ■! 'Other Orenafläoh" is a number iurpulsmüßig Toggle ·' geoteuerter Blekfcroden formed above, which run parallel to one another in one plane. The electrodes 8 are embedded in the surface of a non-conductive block 10!

The electrodes θ v / ground as pulsed beaeiph net in order to distinguish them from the electrode 6. As will be described later, voltage pulses can be selected selectively are applied to selected electrodes 8 »while the G-opposite electrode 6 is maintained at a predetermined constant reference voltage.

The dielectric constant of the insulating block IO forming substance is such that any discharge between Ginander adjacent electrodes 8 is prevented *

In your corona discharge room at the recording point. j int -furthermore, a dielectric diaphragm in the form of an endless one

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■ - 6 -

Belt 12 is provided * daa is driven by a motor 16 via lobes 14 (in the direction of the arrows shown). This is "coupled to de» rollers via a drive belt 10 and Oine Aohae 20 bar motor operates _g that the tape 12 is moved at a constant speed. Dar tataUchliphe Koronaentladungöraum is determined by a number of slots 22 in the belt 12 of the egg _t oh av / iaohen gtßteuerten the electrodes and the Qegeneloktrode is · servant slot have voraugeweise in height mid Bayeito gleichmadig ausgebildet.tind Itann Hechteokform, @o that its longer dimension somewhat larger than the diameter of the insulating block 10 is that in the plane of the electrodes B transversely to the SOhIi 12; runs. Me minimum lung corresponds to; the distance between the outer edges of the outermost electrodes 8.

In an ätonliohor way, the dimensions of the electrode should preferably correspond to those of the expensive electrode combination, so that a uniform corona discharge space is formed in both parts of the recording element · ..:.: ■ ^: "." ^: .'- ■ - '■ "'_s;

As can be seen from FIG. 2, the dielectric tape can 10 in touch mi,% of the controlled sheet metal array move » to that an air gap between him and the electrifuge fled Volume 2 is formed. Since the belt 12 is dielectrically is »it does not short-circuit the controlled electrodes 8.

In the block diagram shown in FIG. 4, the circuit shown in FIG. Writing device shown as block 26 and provided with seven inputs 28 via which a control of a corresponding number of amplifiers 30 is carried out. As from Fi;.;. 2, each input 28 is associated with one of the controllable electrodes connected.

The amplifiers serve to amplify impulses which are generated on the reading lines of a conventional magnetic core device 32. The character of the matrix wires .are connected to the outputs of a conventional decoding circuit 34 which decodes the respective example in .einem buffer memory '■ j6 contained code characters. A typical example of a decoder and. The core matrix associated with the fixture is described in patent specification 3,012,839. The block circuit shown in FIG. 4 generates, for example in the case of the letter "E", a number of parallel voltage pulses φ of the curves shown in FIGS. 5A-G. To simplify the description, run the lateral axis shown in FIG. 5 from right to left and corresponds to the subsequent movement of the slot 22 in the direction shown by an arrow in FIG. 3. The position of the slot 22 shown in FIG. 3 is such that a pulse is present at each input 28 of the writing device 26, as a result of which a corona discharge is generated between each of the electrodes 8 and the G-energy electrode 6. Due to the presence of the dielectric tape 12 in the Entladmigszogkö. however, an actual discharge will me

909828/1536

long a straight line that is perpendicular to the plane the controlled Jllektroden 8 runs and the respective Electrode 8 connects to the counter electrode. This line must also through the Üohlits 22 at the recording location run, since only at this point is the generated field strong enough for a corona discharge.

Due to the laterally harvested impulses at the electrodes 8 and the associated corona discharge become charges of a Polarity on the surface of the dielectric tape 2 generated in a configuration that one or more points of intersection of the Hchlitses 22 with one or more Electrodes 8 depending on the control ■ corresponds to »

Immediately thereafter, the slot 22 is moved near the left (FIG. 5), and the second pulses in the diagrams shown in FIGS. 5A, D and G reach their associated electrodes 8 in parallel, so that further indications in a corresponding configuration the dielectric tape 2 are generated. These charges also result from a corona discharge in the electrode fields, which are represented by the dashed rectangles 3 & .

The corona discharge described above continues, until the entire letter "E" is present on the dielectric tape 2 as a latent electrostatic charge pattern. Then another letter in a similar V; can be

909828/1536 .... BAD ORIGINAL

_t ; he, a be rejected,

ΪΓ-ο Be \ / egunga /; eschwindi _i i; keit de; j Johlitses 22 is synchronized with the reading process on the IZernuiatrix, for which known circuits can be used.

The Erfindimg v is in the same / ice and digital recording Paksitiileinf ormation depending suitable because gleicluaaßig ■ strong iunkte line by line can be eceiclmet on ^ · For dl ο cj era Zv / eck are the anlzounenden ilijn & xle eiuer first electrode S fiir line scanning 2Oii; afLilirt, after which they au- öine bonachbarto - ^ l lectrodo xu-v the niichate line scanning:.; uiuge switches et v / ground, läcj repeats itself until all K electrodes are activated, after which the method can be recovered after s.ohrittv / eiaer "time without the band 2 v / i ed

Even after each scanning line has been recorded, the tape can continue to earth, oo that only one of the K electrodes 8 is activated, not affecting the others

kicked. · ■. ■ ·

Zv; eclaaaßig the mask or the band 12 can have any number of üciilitze, as long as the distance between them is somewhat greater than or equal to the width of the recording area for the dielectric band Z in relation to the movement of the slot

id c- , 1 / t ■ -

ORIGINAL BATHROOM 909828/1536 -

- ίο -

The following should be a one · "", nlain,:; he £ intatn / - \ j writing device according hincriehtlioh whose dimensions represent, they v / ground merely as examples to Verwirk-Ii chung well he In ζ eichnunga erg cbni ε s e mentioned:

Slot width = 0.13 mm

Protective cover a 5> 2 miu

Voltage of the counter electrode = -13üü volts Voltage of the controlled electrodes = + 7Ό0 volts Tape thickness (Mylar) = 0.11 mn

Width of the controlled electrodes = 0 ^ 025 ima length of the controlled electrodes = 15 cm Distance of the controlled EI jictrodes = 0.4 mm Pulse duration = 120 Milcroaelainden

Eo aei denotes that the parai ^ oter in radio! Oiieller "v / eoi.3elu β drawing to each other and for optimal recording Y / ahlv / sise can be changed.

The invention was started! Found an Auaflüiran ^ oforiu besohi is not limited to these ". Without deviating from its basic principle ainä further execution forms laögliöh. Example sy / ei se v / uxdan the electrodes 6 ala controlled in a pulsed manner describedV- while the öeganelectrode 6 a konötantö Related SpamitOig leads »These relationships can also reversed so that the counter electrode is controlled and selected electrodes 8 depending on "Character-. Signals are connected to a reference voltage,

BADORfÖiWAL

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can also choose other types of impulse erseti ^ erii- .. ^; eiceii / di control of the writing device use; will.

The belt 12 does not necessarily have to be in contact with the controlled ones Electrodes have, or duroh, an air gap from the dielectric Aufseichnungsband 2 be separated.

909828/1536

Claims (5)

a t ο Ii t a a s β back 1. Electrostatic boiiroi uvorri clitimg, characterized chiroli at least one straight electrode (o) _f the in one. Alj ο tana a counter electrode (6) assigned ict, provided by an opening (22) with at least one opening (22) which enables a corona discharge and with at least two mutually parallel sides, ux lying transversely to the longitudinal direction of the electrode (U); endless dielectric belt (12), which is moved with an i'rannportvorrichtung (16, 16, 20) between electrode (8) and u-e ₍ ^r ; cii ~ electrode (6) ", and by a signal generator (Pi. ' j. 4), which is electrically coupled to the electrodes and a corona discharge acts through the opening (22) of the band α (12). 2 ... writing device according to .aiiijpru.ch 1, thereby gekemisoichnet, a. that a number of straight lines running parallel to one another. Electrodes (b) in a · '_; em ο inc anon plane is arranged parallel to the counter electrode (6) and because ^r : the opening (22) runs over all these electrodes (b). ι 3. A writing apparatus according ^ icpruch 1 or 2, characterized zeiclinet gokemij that represents Jignalgeber (fq) connected to said jegenoioktrode '' (6) Bezugasp-iinnungctriielle .and a RRIT the signal generation connected to linear electrodes (G):?,! - . tung uiofaJjt, which causes the generation of a corona discharge through the opening (22) as it moves between ^: _-: r -., - 9: 09828/1536 BAD ORIGINAL " the counter electrode, (6) and one or more linear Electrodes (ö) causes. 4 · Writing device according to one of claims 1 "to 3» da- durc2i i; elcennzeicliaeb _r dai) the endloue 13and (12) the line- ^: · aren electrodes (O) touched * 5. TiclireibvorriohtuiiG according to one of the proposals 1 bio 4> da— w by fjekennzeiolino-t that a Yorric] itiin £ j (4) to the · J α toil place on iUiurclnung a iUii'aoichnun / j'atruiierö jav / iüchen The opening electrode (b) and the endless band (12) are provided lot » Blank page