DE1930106C3 - Electrophotographic recording material - Google Patents

Description

4. Recording material according to claim 1 _ao ^, ^ known or proposed in between, characterized in that it is on the electrical _{layers has the} common disadvantage that although they are conductive layer or on the electro-optical properties of the electrophodic substrate, a layer of nickel darau _hischen ^P Strive to improve layers so that

T ^e t ^C ^ \ r ^ ^Zi SJ κ " ^C _t ^{admium and then} against the adhesive strength of the photoconductive layers

the photo e.tfahjge layer contains ^a »on the base disregarded.

5. Recording material according to claim 4, »difficult to solve the question of adhesion, characterized in that the layer of satisfactory. On the one hand, nickel were between 1 and 10 μm, preferably 5 μm, _namely | _{ch exUem} | _{aUe documents} ^ 5 ^ _{um m}

' ¹ Ic-.' .-i UA 1.1 prevent charge carrier lines from spit

6. Recording material according to claim 1, _3o pad in the photoconductive gekennaachnet characterized in that the electrical Ie, - photoconductive selenium take place

Γη μ, ° t ^{TT electnsc} I ¹ ₁ ^conductive and there with the oppositely charged carriers

Layer carrier made of aluminum, an aluminum. ,. . ^ %, ^b . ⁶ ", ° ,. ^.,,. ^6th

1 «« · χλ - cj * Ui ν c XT- 1 1 recombine. Since, for example, in selenium the electrons in

SEÄoESoteSdaJS? '' ^{1 NlCke1} '33 dark about 32 times less mobility than

7 Recording material according to claim 1, "which have holes, is e.g. ^ at pos.Uver charging

characterized in that the ^{photoconductive layer of the} pjoto-conductive layer bevomxgt a wall

Layer consists of selenium. ™ 2 of the holes are made towards the boundary layer.

An electron injection from the interlayer in the photoconductive layer would then have been in the

The invention relates to an electrophotographic ⁴ ° boundary layers even without exposure recom-

Recording material from an insulating bination and thus cancellation of the charge for

Layer support, an electrically conductive layer and sequence. This phenomenon, which leads to the so-called

fine photoconductive coating or an electrical dark decay must of course be prevented or

conductive support and a photoconductive layer are at least kept small, as for the quality

Layer. ^4S electrophotographic charge images a little

As is known, an electrostatic latent La dark decay is also a determining factor.

It made sense, with all previously known interposition and exposure with an activating radiation layer, to avoid substances that create a surface on a photoconductive layer. dung carrier injection into the photoconductive layer This photoconductive layer, which is made of semiconducting ⁵ ° into it, such as in particular substances, such as amorphous selenium, is made up of special alkali or alkaline earth metals, the elec- tron of which is applied to an electrically conductive carrier small, or metals such as copper, usually in the form of a flat plate or a cylindrical nickel, gold, silver, bismuth, tin, aluminum, threshing drum. Zinc and Cadmium, their electron work function

The German Auslegeschrift 55 also makes it comparable to that of selenium.

261 398 became known when using the Re- Furthermore, it has been customary through extreme

flexkopierververfahren the layer support as optically smooth surfaces of the intermediate layers also from

Form grid and between this and the shape of the cargo carrier injection

to keep a thin gold layer from the photoconductive layer as small as possible,
watch. 60 However, since the adhesive strength of amorphous selenium

In order to determine the sensitivity of such systems to such extremely smooth surfaces,

to be increased via activating radiation and the need only slightly and for practical use

It has become known to shorten the clearing time, but it was not previously possible to

between the insulating, photoconductive layer at the same time a slight dark decay with a and a semiconductive layer 65 of high photoconductive layer adhesion strength to the conductive support

to attach, their conduction property of the Lei- connect.

Processing property of the photoconductive layer - insulating interlayers are involved

gives way. Advantage of an exchange of the load carriers between

3 ^W 4

the photoconductive layer and the metal substrate emit electrons from the metal into the selenium against and reduce in this way the waste into it should be possible, nevertheless in the dark neither surface potentials found in the dark, on the other hand less electrons inject.

but also hinder them again after a Beiich- In addition, intermediate layers improve

5 zinc or cadmium with the same roughness depth into the metal substrate and cause the photoconductive layer to become rigid, e.g. the following disadvantages: layer, for example compared to an intermediate layer First, there is a reduction in light plastic or paint. Since the injections from ZmK sensitivity are noticeable, so that an increased or cadmium intermediate layer is very slight, Light intensity is needed to the same wir- io no longer need excessively high requirements effect on the change of the electrical surface - to be placed on the smoothness of the intermediate layer, to achieve charge of the photoconductive layer as The permissibility of a higher roughness ennoglicm without intermediate layer, d. ti, the drop in the surface but again a better interlocking of the photochromic potential during exposure takes place in the case of a light-sensitive layer with the metallically conductive z.wifindlichen systems with an insulating intermediate layer 15 selenium layer and a better adhesive strength than this could reach previous intermediate layers more slowly than with those without insulating intermediate layers. LMe layer intermediate layer according to the invention therefore saves

Second, there is a deterioration in the laborious leveling and smoothing process. electrostatic contrast, since an increased When testing the adhesive strength of the photoconductive

Residual potential occurs. During exposure, the layer falls in the 10 with the aid of the diamond scribing process In general, the potential does not go down to zero, but - the known adhesive strength test according to CI e - only to a small amount different from zero - where the flaking pressure is the benchmark Value that appears as a residual potential. Intermediate residual potential showed that the adhesive strength used is undesirable, as the following improvement in the development of the layer compared to aluminum substrates with a natural image that follows the exposure, the convergence or artificially reinforced oxide layer: trast between the exposed and unexposed

Digits is decreased. Factor 2.6 and for cadmium layers by the t-ats.-

The invention has the object of creating an electrophoto tor 2.4 higher than the chip thickness in aluminum graphic material that has the disadvantages 30 with a natural oxide layer. Compared to A ¹ " ¹ " ¹ " ¹ " / "previously known or proposed intermediate with artificially reinforced oxide layer lay to AD layers and at the same time avoids low dark space pressure of the zinc layers by a factor of 2.4 and high electrostatic contrast due to the Cadmium layers by a factor of 2.2 high, small residual potential with susceptible and satisfactory. At the same time, the electrostatic contrast in

The adhesive strength of the pfcotokit-capable layer 35 is improved in the following way:

connects. Compared to an aluminum underlay with natural

The subject matter of the invention is based on a thin oxide layer, the zinc or cadmium electrophotographic recording material made of intermediate layer an insulating layer support that is 1.1 times higher, an electrically conductive contrast potential, compared to an aluminum-lower layer and a photokitable layer with an artificial layer reinforced oxide layer an electrically conductive layer carrier and a factor of 1.2 higher contrast potential. a photoconductive layer aas and is thereby For the production of the inventive cm-

characterized in that there is between the electrical line layer, the usual electrochemical layer or the electrically conductive layer, deposition process or electrostatic Layer support and the photoküfämgai layer are suitable for spraying. The intermediate layer wira Contains at least one metallic layer with a thickness of 1 to 25 µm, preferably 12

The invention ensures that the electrical bit IS μη applied. It has proven to be advantageous to record material between the cadmium and eggs lower residual potential and thus a higher image zinc layer and the conductive base another one has a contrast, because the charge carriers that apply after about 5 μΐη thick nickel layer, the exposure and increasing the conductivity of the The conductive base consists of metal or of

Photoconductor from the surface through the semiconducting plastic with a metallic coating or from a metaitende layer hm durchwanden, as a surface made conductive plastic and has the uedungen on the upper side of the metal intermediate layer of a flat plate or a cylindrical ten find their image charges for recombination. 55 drum.

The extraordinary effect for the metal of the base or the layer also has an effect

Good transverse conductivity of the metallically conductive plastic is expediently aluminum Selenium layer, which therefore has the disadvantages of insulating or an aluminum alloy or brass or Ending or semi-paving layers vcirmeidct. Spring steel or copper or nickel or molybdenum

According to one embodiment of the invention, Fe or chromium or gold is selected, the metallic intermediate layer is preferably made of. In the case of electrochemical application of the intermediate

Zinc or cadmium. This configuration of the layers, which is particularly recommended, can Invention, there will be a slight dark decay as in the case of various methods to be used, achieved non-metallic intermediate layers. Over- For example, either without chromating Surprisingly, it has been shown that zinc «5 is shiny cadmium or shiny galvanized, or is used and cadmium, whose electron work function min- commercially available baths. The duration of the bath is at least about 0.6 eV shorter than that of selenium and, depending on the layer thickness and type of bath, is 5 to 50%, which can already be seen in the de-energized (fetdliMcn) state.

Claims (3)

1 2 Claims: It has also become known to ._.,,, ... _A,. , lust of electrophotographic systems in the dark, 1 Electrophotographic recording _{wheel so-called} dark decay, to prevent or Tenal a _ren from EIASM insulating substrate _{to verrin} g by an insulating intermediate electrically conductive layer and a photoconductive 5 _{sch {cbt et} ^ _{a made of a} plastic or a lacquer, higen layer or an electrically conductive layer _{between the} photoconductive slide and the conductive Layer support and a photoconductive layer, _the underlay is attached. It is suggested characterized by the fact that _the effect of this isolating intermediate rule of elektnsch conductive layer or _{layers m} and improve their disadvantages by Electronically conductive layer support and the photo ίο _{m prevent it from} getting into the plastic intermediate layer conductive layer at least one metallic _additive _ for example conductive metal like Layer contains titanium - to be embedded. 2. Aufzeichnungsmatenal according to claim 1, Finally, it has been proposed, referred to as Zwidadurch that the metallic _{layers OXYGEN rule} ⁵ _of f. Send together or sulfur-containing zinc or cadmium is. _{15 bind about VOQ} aluminum, molybdenum, WoIf- 3. Recording material according to Claim 1, vanadium, silicon, titanium or tantalum i ££ j & ?? ^ * ^ f _vo ^d "^ eSS ^{6 brin} S ^{en or} Zwi ^ henscachten to ben *** that with luu, viiizugswcibc between _a chromating or phosphating