DE2020794C3 - Electrophotographic copier - Google Patents

Description

The invention relates to an electrophotographic copier for performing a method

rens, in which before the uniform charging takes place to generate a charge image photoconductive recording material a primary charge and simultaneous total exposure and / or after the generation of the charge image by image-mimicking

♦ The above exposure is a total exposure.

An electrophotographic copier using this method is disclosed in the United States patent 3438706 known. This becomes a photoconductive one Recording material for electrostatic

♦ 5 see charging either in the light or in the dark exposed to a primary corona discharge and then under to eliminate that charge simultaneous imagewise exposure of an alternating current or direct current corona charge.

So sets. The recording material is then used to achieve a high-contrast electrostatic Charge image totally exposed.

This electrophotographic copier uses various lamps such as a lamp for

the simultaneous total exposure for primary charging and a lamp for total exposure after the imagewise exposure, as well as the corresponding shields. These lamps with their shields result in a complicated structure of the

Device, cause a greater susceptibility to failure and relatively high manufacturing accounts.

The object of the invention is the number of required Lamps and shields for the devices for primary charging and for total exposure

to keep it as low as possible, to simplify the construction of the device and to increase the temperature in the device together with the resulting fogging on the photoconductive "" recording material

According to a first embodiment, this is achieved by the fact that in the immediate vicinity and in the sense of a continuous movement direction of the fptolcit-capable recording material * before / or after the Belicbtungsstatlon for the Bildroä tt BeÄng stations for total exposure are on, that the lighting devices for J _e are formed from eSung the template for imaging S dafAufzeichnungsmaterial in conjunction with the optical imaging system so that a part of the aeunc Hehlesder illumination device without Beaufcrh the copy master in the direction of the AbdStik is faded out, and that the Abbildas

Mpiff set i ₌ ^ fish copier is set up so that drawing materials 1 and em to copy 2 are moved synchronously in the directions through ^^. In doing so, voltage material 1 w & trough one under a charging device 3

During the passage »^ »Direction 3 is the autoi | * nung ^ ri possibly by a good elect [° each 5 m illuminated by means of a lamp 4 arranged above the charging device. Subsequently, the exp

^1S Ä

, - s? Sii

tune the recording material at the electrostahl-S Piäfldestation and for the following tables Ss

kept low wild. ■

According to another embodiment of the invention the electrophotographic copier ? t from the fact that in the immediate vicinity 3 <> and.meses of a pass-through movement direction of the photoconductive recording material as before and / or after the exposure station for the image-sized coating Stations for the total exposure are arranged that the lighting equipment for the illumination the master copy for mapping onto the recording material in connection with the AbM-dungsoptik are designed so that part of the Liehtes of the lighting equipment without exposure

Like from FiT

35

Äft ^ Aisc ^ n ^ v ^^^^ Suahlengang of the imaging optics in the direction of ^ des Recording material opposite the stations for

shields total exposure.

In this embodiment, the imaging optics are bypassed by the light reaching the stations A "rf β"". As a result, a larger proportion of the total light reaches the two states - so it is shown in greater detail in the drawing of the exemplary embodiments shown. In detail, "hp" shows

1 is a schematic side view of a known electrophotographic copier,

Fig. 2 is a schematic side view of an inventive electrophotographic copier

ISsÄ

shows, this requires electrical | * "° ät not only institutions like

5f ^% ^e i * ^e jStolie of the lamps to be copied 6 to ^ A ^ lighting ^ P ^ _-

Against ""! "^ Sond ^ > κ ^^ ^Γ \ _{ο with the} shields we d ^ e lamps _{chß first} .

mungeniU and iz luj ™ _{Di {uds 2U to one}

^^^? _η ΤΑ manufacturing costs

frequent malfunctions during operation, g _{arrangement of the L m} .

_the surface to be exposed itself execution of the shields J ^^^ given that stray light falls on the ieUch ^ F ^ e in the image generated on this

^^ iJJ _bBch i _n "ung" i 11,12 ver ^ £ _Stfc , _{le sees the} invention one

JnoSnune before, in which part of the by the lam- ^Α " ^ο ^"" ^η | °, ' _{htng of} the counter to be copied

Disadvantages according to the A and the

_%% . 3 to 6 each a schematic sectional view of different embodiments of an optical system for use in the device according to Fi g.

«Wrmuneen 11,12 simple facilities for stra»> ^ Guilds ^ ^^ . ^. ^ ^ _By

Reflecting a portion of the erzeug- by the lamps 6 ^ ^e _n ^fl ™ _s ^ei _"u ^en _en" stations A and B direct ^^^ runjibeispiel the invention, in which

right after

7 shows a schematic side view of another electrophotographic copier with an optical system according to the invention, in which a Projector lens and electrostatic secondary charging devices at the two ends of a shielding

_{Device t} . ^ _{Bt m}

Execution includes a pair

ΐηίΑΪ »the primary _charging station ψ * £ ngss station B is steered,

is 6 show other exemplary embodiments

of the invention, in which, by means of the following, FIG. 7 shows a further exemplary embodiment of the

written devices a part of the invention, in which in place of the shield 13 a

Lamps 6 generated light to stations A and generally cylindrical shield 17 is used,

B is steered, Fig. 3 to 5 each show only the the edge of the Lince 8 with the side walls

left half of an arrangement according to the invention; 5 of the secondary charger 9 connects and so-

the other half is delimited with a beam path 18 for reasons of clarity. On a couple

omitted. Reflector _{screens 7 6} openings 19 are formed,

In the case of the reflector screen 7 ₂ (FIG. 3), the upper one through which it is part of the screen used by the lamps 6

Edge angled inwards, so that together with generated light directly bypassing the lens 8

the (not shown) reflector screen 7 ₂ a pair io to the electrostatic primary charging station A and

Reflector surfaces 7 _{r is} formed. Part of that falls through total exposure station B. With this arrangement

The light generated by the lamps 6 is reached by this cleaning, a larger part of the light generated by the lamps 6

reflector surfaces T ₁ . reflected and through a lens 8 outgoing light the stations A and B.

through to the primary charging station A or the To- Thus, in the invention, according to the

Valley warning station B steered. ¹ S foregoing description, a part of by a

In the embodiment according to FIG. 4, the light source is used to illuminate a to be copied

light generated by the lamps 5 from a glass surface object for illuminating the light

before the CC of the slide table or of an electrostatic primary charging station and the total

Pair of reflectors 15 arranged on this partially exposure station, so that none for these stations

reflected, while in the embodiment * ° to provide special lamps and shields

According to Fig. 5, part of the light from a couple are sideways. The invention thereby creates a compact one

Hch of the lamps 6 arranged reflectors 16 and economical electrophotographic copying

is thrown back. In all of these designs, the simplest structure and the greatest operational reliability

becomes the security reflected by the respective institutions.

Part of the light through a lens 8 according to FIG. 5 Although the invention is to this effect above

Primary charging station A and the total exposure status is described that stations A and B of the device

tion B steered. to be illuminated or illuminated, is nonetheless

In a further embodiment (Fig. 6) the lighting of only one of these stations is possible,

Part of the light generated by the lamps 6 at the stations A and B, even when illuminated

lower margin 7 ₅ . of reflector _{screens 7 5} back-3o dependent on each other to generate a latent image

thrown. des contribute, u'ie. primary electrostatic charging

In the embodiments of the invention according to Fi g. 3 tion A encompasses the area immediately below from to 6, the light generated by a pair of lamps 6, charging devices 3 and the up and down adjoining parts in the direction of movement by means of corresponding reflector devices are effectively reflected and through a lens 8 to form 35 moderately equivalent areas. Therefore, the light generated by the primary electrostatic charging station A and the lamp 6 is directed to at least one of the total processing station B. In contrast, these areas are additionally steered. f

1 sheet of drawings

Claims (7)

Claims; 1. Efffektcfotografisches copier for carrying out a method in which a primary charge and simultaneous total exposure and / or after the generation of the charge image by imagewise exposure a total exposure takes place before the uniform charging of a photoconductive recording material that takes place to generate a charge image, characterized in that in immediate Neighborhood and in the sense of a continuous direction of movement of the photoconductive recording material (1) before and / or after the exposure station for the imagewise exposure stations (A, B) for the total exposure are arranged that the lighting devices (6) for the illumination of the master copy (2 ) to the , Mapping on the recording material in connection with the imaging optics (8) are designed so that part of the light 6 from the lighting device without acting on the master copy in the direction of the imaging optics can be hidden, and that the imaging optics is designed so that they Tel; of light in Area maps at least one of the stations for the total exposure. 2. Electrophotographic copier according to claim 1, characterized in that by each one in a part of each reflector screen associated with the lighting devices (6) (7,) formed opening (14) through a part of the generated light via the imaging optics (8) to the area or areas for total exposure of the recording material (1) is steerable. 3. Electrophotographic copier for carrying out a method in which a primary charge and simultaneous total exposure and / or after the generation of the charge image by imagewise exposure takes place a total exposure before the uniform charging of a photoconductive recording material that takes place to generate a charge image, characterized in that in the immediate vicinity and in the sense of a throughput direction of movement of the photoconductive recording material (1) before and / or after the exposure station for the imagewise exposure stations (A, B) for the total exposure are arranged that the lighting devices (6) for the illumination of the master copy (2) for imaging on the recording material in connection with the Abbüdungsopiik (S) are designed so that part of the light of the lighting devices without impacting the original in the direction of at least one of the stations (A, B) for the total exposure g can be faded out by bypassing the imaging optics (8), and that a screen (17) is present which screens the beam path of the imaging optics in the direction of the recording material from the stations for each total exposure. 4. Electrophotographic copier according to at least one of claims 1 to 3, characterized in that that to hide part of the generated by the lighting devices (6). Light in the direction of the stations for sealing the recording material "(!) Each KeilektoHcMnn (7,) on its upper edge has a reflecting surface (I _x ) at a predetermined angle, 5. Electrophotographic copier after at least one of claims 1 to 3, characterized in that to hide part of the from the lighting devices (6) generated light in the direction of the stations for the total exposure of the recording material (1 die Underside of a table or support (C-C) for the master copy (2) or a special one on it arranged part (15) a reflective surface forms, ... 6 electrophotographic copier according to at least one of claims 1 to 3, characterized by a reflector (16) arranged to the side of the lighting devices (6) for masking out part of the generated light in the direction of the stations for total exposure of the recording material (1). 7 electrophotographic copier according to claim 6, characterized in that the reflector arranged for masking is in each case formed by an edge (7 ₅ ,) of each reflector (I ₅ ) which forms a reflective surface.