DE1816200C - Facsimile machine - Google Patents

Description

1 2

The invention relates to a facsimile machine in which nisses eliminated because the proportionality factor an original by means of a scanning spot and one between the rotational and axial movement of the this surrounding area of at least the drum on the one hand and the corresponding elec-

zwa; _t times as large diameter is scanned tronenstrahlablenkungen in the X or K-direction

and from the light coming from the original 5 can easily be changed in that

radiate from the scanning spot and the surrounding area - only the amplification of the X and Y deflection

trical scanning spot signals and ambient signals generated levels for the tube adjusted accordingly,

and in which the scanning spotsionale with the help of US Pat.

the environmental signals to increase ('.s playback simil device with a device for generating

contrasts are modified and the reproduction io color separations are described, in which by mechanical

signals of an exposure arrangement for exposure niche movement a scanning pattern or raster for

of a reproduction material. an original is created that is compatible with both jinem

Electronic devices for obtaining points of light as well as with one of these surrounding color extracts from a colored original are all surrounding area is scanned. From this point of light, commonly known as "scanners" or "scanning devices". i ₅ and the scanning of the surroundings become separate electrical devices. With conventional scanning devices, the colored signals are derived. With the original slide from the surface scanning or the "copy" in front of a stationary derived signal, the image signals derived from the light point WViRlichtsirahl are attached to a drum, the scanning modified so that rotated und! - is moved axially at the same time, so that the i _{n of} the resulting reproduction of the light beam between the copy abtust rasteiförmig. ¹ !, Where it is ₂ o a local tone detail and the tone values in the contrast seleksitiitsitiitsmodulated through the different tone values of the copy inten- environment of this detail. The modulated white beam is tive compared to the contrast value, which is broken down into three primary color beams without dilution, of which a reversal of the surface scanning signal would result in three electrical color components. These teachings can be derived for generating a signal. These signals are treated mechanically in area scanning are each computer which, among other things, is not applicable to -ibiast devices in which the original in addition to the three chromatic color components is scanned with a cathode ray tube, generating a black signal . Furthermore, in US Pat. No. 3,128,333

These four signals are used to intensively control the display of a printed color reproduction using an electronic caution for speaking stationary image exposure rays. whose j. each. one of four sensitive writings, which are exposed from a colored original image to photographic film sheets, which is provided. The caution contains an optically on the same drum; : Bred are like the output arrangement, which signals c, in. y and / 1 copy, so that the one / one exposure rays (on derives, represent the areas of colored halftone dots due to the rotation and the axial movement of the 35, which in each proportional area of the Drum) the colored reproduction can be printed on the corresponding film sheets. The signals write the same raster as the scanning light beam on <·, m, y and / 1 are then used to generate the original copy. In this way, on the len Ci. Mi, Yi Bi, Gi, Ri and t nerzugeh -. 'I. which four sheets of three chromatic color separation images and individually assessed proportions of the printed black / white excerpts from the originals exposed 40 th color components in each proportion area of the and recorded. Display the playback picture. These individually

It is often necessary that the separated images are then sent to further processing.

have a different size than the original image. In the case of processing circuit supplied where they correspond to the

a standard scanner in which the scan is used for color matching relations between corresponding

of the original on the mechanical 45 printed color components described above and the primary color

As this is done, difficulties arise from media components of the image reduction device.

Nisclier and optical in nature, if you combine a light generated by 1: 1 direction. Which

wishing to achieve a divergent enlargement ratio. The resulting signals R, G and B are then

These difficulties are even greater when the image display device is supplied and colored

this ratio is reproduced for various image frames / cycles 51. The ones reproduced in this way

or processes should be different and consequently signals R, G and B are set in each proportion

this must be taken care of. that the operator area of the reproduced image to the respective

change the enlargement ratio as desired, the same color together as they are due to the combination

can. tion of the corresponding proportions of the

It has therefore been proposed that the original copy 55 be produced as a printed reproduction. One

stationary, d. H. stationary in front of a cathode ray tube simultaneous generation of a scanning spot and a

to attach and with one of the electron beam of the environment through the cathode ray tube and the

Tube generated light spot or light point atiszii- subsequent separation of the corresponding signals

light up and thereby the electron beam does not occur synchronously there.

with the rotation and axial movement of the drum 60 According to US Pat. No. 2,691,696

In addition to this, in a grid-like manner (i.e. in different mechanical arrangements)

other orthogonal AS and K direction) to either scan a transparent original

so that the written by the scanning light point at the same time or one after the other with a scanning spot

Grid has the same shape as the grid used with and a blurred surrounding area. Dei

the photographic sheets on the drum are 65 diameter of the surrounding area according to column 7,

be cleared. By such a cathode ray lines 5 to 10, about 1.5 to 5 times as large as dei

scanning the original becomes the difficulty of a diameter of the sharp Abiastfleckes. The dori

Selective adjustability of the magnification ratio- applied mechanical scanning methods allow

³ I ⁴

does not rely on the use of a cathode ray F i g. 4 is a block diagram showing the details of a

transfer tube. Device according to Fig. I for spiral area scanning

From the German patent specification 1 164 462 it is illustrated,

the modulation of a cathode ray in focussing Fig. 5 the mode of operation of the device according to approximation and defocusing intervals known, but 5 Fig. 4 illustrative diagrams,
this patent describes the digitization of FIG. 6 ς ^ Block diagram of a part of the video signals, the scanning raster of the periodic advises according to Fig. 1, the area scanning being carried out by focused and defocused beam for defocusing,

effect of two auxiliary scanning functions is changed. 7a and 7b show the defocusing process in FIG

The io obtained with the aid of the auxiliary scanning functions of the device according to FIG. 6 illustrative

Signab are used for gain control for control positions,

tion of the threshold value setting of a digitization Fig. 8 is the block diagram of part of the circuit. Depending on the amplitude of the advice of Fig. 1, the area scanning below Gain control signals speaks the digitization use of interference or noise signals occurs, Switching to analog signals, softer focus- 15 Fi g. 9a and 9b show the area scanning process in FIG Scanning sampling intervals for generating digital visualizing pulses of the device according to FIG. 8 be derived. The presence or positions

The absence of a digital pulse indicates whether F i and! () The block diagram of a fimrunet is the letter of the scanned original in the form of the device according to FIG. 1, the areas or not. ₂₀ scanning using a; / white-ray catho-

The invention is therefore based on the object. the beam tube takes place, and

an image scanner / u sound, in which there-. Original Fig. 11 the block diagram of a Auslülmings-

image with a form "of the device according to FIG. 1 generated by a cathode ray tube, in which the reproduction

th beam spot in a main path or main passage ducti.-n through a pull-out mask and scanning

is scanned and from this main passage scanning 25 of this mask with an additional cathode ray

one or more reproduction or training tubes is affected.

The original shown in Fig. 1 contains a film value content by one or more auxiliary signals. the exposure unit with a drum 21, which is on a is fixed by a further scanning process in the cathode shaft 22, which zaptenden beam tube in bearings 23. 24 are obtained, are modified. 30 is mounted and by a motor 25 ar a support-preferably is supposed to work with an auxiliary signal gear rack 26 which also hold the bearings 23, 24 which is rotated by cathode ray scanning constant speed. On the support frame 26 is is obtained with the help of an extract mask. opposite the drum 21 on guides 28

This task is arranged in a facsimile machine, with Schuldem slidable parallel to the axis of the drum 21, an original by means of a scanning spot and ₃₅ th 27. The slide 27 is displaced to the left by at least twenty times as large a diameter for each of the surrounding areas of the drum as it is at least one full revolution. This advance is scanned and from the carriage coming from the template is carried out by a drive mechanism - light beams of the scanning spot and the environment n: us 29 of, for example, the type described in the U.S. patent electrical scanning spot signals and enveloping signals written in 2 778 232 .
The carriage 27 carries four axially spaced glow aids for the ambient signals to increase the re-lamp 35a to 35d . hereinafter referred to as gabekontrastes modified and the re-yellow, magenta, cyan and black lamp. These output signals of an exposure arrangement for Beiich- four incandescent lamps generate the corresponding exposure direction of a reproduction material, 45 light rays 36 "to 36", each of which is achieved according to the invention in a way that is bright as a scanning spot on a corresponding one of four senin per se known manner the raster-shaped sensitized photographic film sheets 37 "bis directed luminous point serves a cathode ray tube, 37 d focussed, which are attached at an axial distance on the cathode drum 21 that produces the luminous spot, so that it modulates the beam together is. that, in addition to the Ablastfleek 50, it circulates with it. The individual left shifts, including the area around the periphery of the cathubic steps of the carriage 27, are temporally generated in such a way that the light continues to shine. that they always take place when the converter tube 21, which converts electrical signals into electrical signals, adopts an angular position controlled by the cathode ray modulator in which the exposure beams are directed to the signal separation circuit for deriving the scanning spot drum surface instead of to the films 37 "to 37 </ signals and the surrounding signals from which these two impinge. Du - h the output signals of the combined stepwise axial advance of the Schiit converter, which contain information about the drum rotation, are connected downstream. At least 27 is therefore achieved that the beam spots the

In the following, the invention is scanned in a grid-like manner using the film sheets in question.

60 Simultaneously with the film scanning, the four

tert. It shows exposure rays through four of the incandescent lamps 35 η

F i g. 1 shows the block diagram of an according to the invention to 35 « ¹ supplied via lines 38« to 38 «"

Ben facsimile machine, signals intensity modulated. The signals in the line

Fi g. 2 is a block diagram showing the details of a device 38 «to 38 r /, the extraction of which will be given later

Device according to Fig. 1 for radial area scanning 65 is explained in detail, represent the yellow,

illustrates the magenta, cyan and black components of the

3 shows the method of operation of the device according to scanned tone values of a colored original slide 40

Fig. 2 is illustrative diagrams, and cause the rays of the incandescent lamps on

the corresponding Filinbliiltem 37ί / '37 />, 37c, 37 d, yellow, magenta, cyan and black color separation images of the original image exposed. With the help of the resulting color prints (which "can either be positive or negative), a reproduction of the original copy 40 is made in a known manner, for example in the form of a halftone color print of the original or a color slide, which corresponds to the original.

The rotary movement of the drum 21 and the axial movement are used to scan the original 40 of the carriage 27 via corresponding mechanical couplings, represented by the dashed lines 51 and 52, transferred to a synchronizing unit 50. In the liinhcit 50 the rotary movement is on dc.i Schleiler 53 of a rotary potentiometer 54 with a resistance winding 55 transferred while the axial movement on the wiper 56 of a Lincar potentiometer 57 with an opposing winding SK over will carry. The two windings 55 and 58 are each with a linden to ground and with the other sources at a source of constant DC voltage.

The potentiometer 55 works as follows. During each full revolution of the drum 21, the grinder 53 sweeps over the winding 55 once at a constant speed while a sawtooth signal is added which is repeated periodically. The falling trailing edge of this sawtooth signal is shorter than the rising leading edge. The entire increase is linear from zero. so that the leading edge of the saw tooth rises in a straight line. The trailing edge or "return" initially drops almost instantly to zero ah. to then stay at zero until the beginning of the next sawtooth. The angular arrangement of the grinder 53 with respect to the films 37 a to 37 d on the drum 21 is chosen so that the beginning of the sawtooth rise from zero occurs at or before the time when the rays 36a to 3 ft </ just begin to touch the films 37 "to 37 d. The winding 55 has such an angular length that the beginning of the return line of the individual saw teeth occurs at or after the point in time when the rays 36 "to 36 d have just arrived at the hand of a line scan on the film.

In the case of the linear potentiometer 57, the wiper 56 is adjusted in relation to the carriage 27 in such a way that it picks up the grounded end of the winding 58 when the beams 36a to 36 d move to the right of the (Fig. 1) right edge of the film sheet 37 σ to 37 a " When the slide 27 advances step-by-step to the left, the wiper 56 also moves step by step over the winding 58 to the left, as a result of which a sawtooth signal is generated on the wiper, the leading edge of which rises in the shape of a trumpet from zero is. that the rays 36o to 36d reach the left edge of the film sheets 37a to 37rf, the carriage 27 is transported back to the starting position on the right, with the grinder 56 also being guided to the right, generating the "return portion" of the sawtooth signal will.

The signals generated at the wipers 56 and 53 pass via the lines 59, 60 (for the wiper 53) and the lines 61, 62 (for the wiper 56) to the Y deflection terminal 63 and the y deflection terminal 64 of a cathode ray tube 65 which is equipped with the usual gain control buttons 68 and 69 for the X and K deflection, respectively. The tube 65 forms a component part of the electronic part 45 of the device according to FIG. 1, which reveals both optical and ironic structural units. The terminals 63 and 64 of the tube 65 are connected to conventional deflection units for the grid-shaped beam deflection in the, Y and V directions. The electron beam of the tube generates in the usual way at the point of impact

ίο a sirahl spot or point of light 67 of intense, expediently polychromatic light on the fluorescent screen of the tube (a suitable phosphor is one with J. II. DBC TypP-24 spectral characteristics). ^u Crnci contains the tube 65 conventional means for blanking the Strahlflccks 67 during retrace after full deflection by the signal from the grinder 53 and the signal from the grinder 56th

As can be seen, it is under control of the rectilinear ascending and the staircase ascending Sawtooth signal at terminal 63 or terminal 64 of the beam spot 67 in the V direction in a series of lines deflected over the tube screen, which are successively offset in the Y-direction

2 $ are, so ¹ MB is a raster scan. The Hrzcugung of the sampling grid is / / synchronized with the F.rzeugung the sampling pattern of the exposure beams 36 'to 36 (on the Filmblältern 37' to 37c. The dimensions of the Strahlflcckabtnstrastcrs Ka'hodenstrahiröhre in the X and the Y direction correspond to and are proportional to the dimensions of the film scanning raster generated by the rotary movement of the drum 21 or the axial movement of the carriage 27, so that the beam spot scanning raster has the same shape as the film scanning raster Adjustment of the X- and V-angle controls 68 resp.

69 to change. In the present apparatus, therefore, the magnification ratio between the size of generated by the Röhrcnstrahllleck 67 sampling grid, and the size of the d-written by the exposure beams 36a to 36r / on the films 37a to 37 raster optionally or as desired is variable.

The light beam generated by the beam leak 67

70 is through optics 71 (in Fig. 1 schematically represented by a lens) to a white light point 75 bundled, which is the original color slide 40 in

Scanning a grid that matches the one on the screen Tube 65 generated by the Sirahlfleck 67 scanning raster corresponds in shape and proportional in size is. In the beam path between the tube 6f and the slide 40 is a small fraction of the light; from the beam spot 67 from a beam monitoring device 76 (to be described later) the output of which appears on line 77, from being caught.

When passing through the color slide 40, the white light of the light point 75 is modulated in the color content and ii the intensity according to the tone values of the slide. After exiting the slide 40, the modulated light beam 76 reached a color analyzer 80. The analyzer 80 derives three different color signals from the light beam 76, which are transmitted to the outside 8! α, 81 b and 81 <appear and in it the respective instantaneous amplitudes of the blue components, green components, and red components of the respective

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Farhionwcrlc of the slide 40 detected by the light point 75 correspond. Although the signals at the outputs 81 «, 81 Λ and 81 r are directly related to the blue, green and As is known, signals of this type are usually referred to as Gell ·, Magcnla or Cyan signals. This signal · ,; are to lines 82 «, 82 /; and 82 c of a common channel 83 supplied.

From channel 83, these signals reach a signal separation run 85 (to be described later) and from there into a yellow channel 86 ", a magnetic channel 86 /" and a cyan channel 86 f form a signal channel 87. After exiting the signal channel 87, the signals are in a computer 90 processed, which among other things generates a black component signal, its momentary amplitude values represent the black and white or achromatic content of the tone values of the slide 40. the treated yellow, magenta and cyan signals (i.e., the chromatic color component signals) and the Black signal (i.e. the achromatic color component signal) are given as electrical output variables of the computer 90 in the lines 38 «to 38 (/. These signals control the incandescent lamps 35 "to 35f / for the purpose of exposing the films 37" to 37 "" Yellow, magenta, cyan and black figurines of the original color image on the color slide 40.

The raster-shaped scanning of the original 40 through the beam spot of a cathode ray tube and the synchronization of the Frzeucimp dirsrs Ahinifa ^ tcr "with the production of the scanning raster for the films 37" to 37 (, 'mn the TiOinnni 2i are measures that are not in themselves the subject The present invention belongs to the present invention because, as mentioned, these measures are already known in a scanning device. Furthermore, the device according to FIG For example, the scanning of the films 37 "to 37i / can also be carried out in such a way that the drum 21 is transported stepwise or continuously past the incandescent lamps 35" to 35f /, which in this case are stationary for the synchronization of the discharge laser of the tube 65 with the scanning grids of the color separation films 37 "to 37" ¹ instead of the potentiometers 54 and 57 also use other facilities. Then the grid with which the original 40 is scanned does not necessarily need to be generated fully electronically, ie exclusively by deflecting the electron beam of the cathode ray tube. Rather, one or both deflection directions of this scanning raster can instead be generated by mechanical movement of the original 40 relative to the cathode ray tube 65. Both deflection directions can even be generated by mechanical movement of the original 40 relative to the cathode ray tube 65.

According to the invention, the device according to FIG. 1 provides that the cathode ray tube is under the control of a unit 100 which fulfills the following functions:

First, the unit 100 supplies a signal to the tube clamp 102 via the line 101 , which signal controls the intensity of the tube beam so that the beam is periodically controlled and blanked and its brightness is regulated, as will be described below.

Then the tube control unit 100 delivers via the Line 103 to tube terminal 104 provides a variable voltage that determines the degree of focus of the Röhiensteam controls.

Furthermore, in accordance with a preferred embodiment of the invention, the control unit 100 causes auxiliary deflection signals to be added via lines 105, 106 to the primary sawtooth deflection signals which are fed to the X and y deflection terminals 63 and 64 from the unit 50, respectively. As will be described later, these auxiliary signals c cause the original 40 to be scanned by the cathode ray tube 65.

In order to generally explain the manner in which such an area scan is produced, it should be pointed out that when the original 40 is raster scanned by the light point 75, the latter follows a path most of the time on the original which is exclusively through the clamps 63, 64 of the primary disconnection signal supplied to the synchronizer 50 is determined. This scanning of the original by the light spot 75 is hereinafter referred to as "half-scan" or "main scan". At intermittent intervals, however, the control unit 100 supplies the terminals 63, 64 with the mentioned auxiliary deflection signals, which are thus superimposed on the primary deflection signals. These auxiliary signals have the effect that the deflection movement of the light spot 75 in the main scanning path is superimposed with an additional 3 movement. The form of the two hiifsabiejik signals are matched to one another in such a way that the light spot 75 scans the original 40 in the relevant intervals during its additional movement, in each case over a surface area which is centered with respect to the main scanning path and along it with the speed of movement of the light point 75 in the main scanning path wanders. Preferably, this is at least 2 Fläclienbcreich () times greater in diameter as a light spot s 75!; Very good results are obtained when this area is lOOnially larger in diameter than the point of light.

During each of these intervals the light point 75 only scans a part of the mentioned surface area away. However, the control unit 100 also causes the shapes or courses of the Hilfablcnksignalc are progressively and cyclically changed so that a progressive shift of the parts of the surface area covered by the light point 75 takes place at. thereby the light point 75 within the time span between two successive ones Surface scanning intervals sweeps over the entire surface area. That is, within During this period of time, the point of light 75 samples each of a substantial number of samples Area sectors that together form the entire area. With this passing over of the the light point does not cover every single point of the entire area of the surface area, but only sample parts or sections, which however are numerous enough and so located that a reliable indication of the mean or average tone value of the original 40 is obtained over the entire extent of the surface area. Furthermore, although the Repetition or repetition frequency of the area scanning interval c in harmonic relationship to the repetition frequency of the cyclical change of the waveforms

209652/473

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of the auxiliary flashing signals; however, this is not the case. With reference to FIG. 2, certain figures should now be absolutely necessary. As can be seen, the scanning of the original is described alternately, in which the control relay 40 through the light point 75 between relatively uniform 100 radial scans of the above-mentioned short time intervals, in which the main 5th cheiibcreichs generated. In the Kinhcit 100 after Fi ι ». 2 scanning movement of the light point generates an oscillator and rectangle generator stage siting is superimposed, and relatively long time intervals 130 in the line 131 a running sequence in which only main scanning takes place. The square wave oscillations with a frequency of area scanning and the main scanning correspond to 320 kHz and a period of 3.125 microseconds in intensity fluctuations of the beam 76 m per oscillation. These reverse vibrations are thus claned in so-called "time-shuffling" relationships to a binary counter with four flip-flop stages (time division or time division multiplex) / no-132 "to 132i /, which each time after receiving from another. The color analyzer SO, however, does not distinguish I (S rectangular input vibrations or pulses between beam fluctuations which are erased and reset by the self and a new area display, and those which are started by the main counting cycle. Since each of these vibrations are caused by scanning. At the outputs 81 «, 81 /> has a period of 3,125 microseconds, and 81c of the color analyzer and .in common the duration of a counting cycle or a counting period channel 83 are therefore 50 microseconds from the main scanning of the Ifi counter.
The oscillator square generator 130 and the silent signal fluctuations in spite of their titanities 132 "to 132t / of the binary counter are mixed with one another in a sharing relationship. Diode decoding matrix with three decoders 135 "to

In the signal separation stage 85, 135c are connected under Ausnut. During every 50 microseconds of the time-shifting relationship, the signal fluctuation counting period is supplied by the decoders 135 "to 135" in channel 83 as output signals that are separate from light point signals, shown in FIG. 25 by the signal curves A, B and C. As you can see ¹ , signals are separated from the area scanning it supplies the cathode ray tube 65 with auxiliary while the output signal of the Flcmentcs 135Λ a deflecting signal, also via the line of similar MO, directly following the pulse A, a key control signal ¹ , or switching signal for the signal _3t) pulse and the output signal of the Rlcnicntcs 135 <separating stage 85. The separator 85 is an electronic one single return pulse from a 25 micrometer-kun switch, the normal one wise the signals from the channel with a duration equal to the sum of the duration of the 83 in the light point signal channel 87 transmits, dagc- pulses A and R is.

The pulse A passes through an amplifier 14On during each of the aforementioned intervals

Control by the mentioned sound signal the yellow, 35 to two Gcgcnlaklmodulatoren 150 and 151, the jc-

Magenta and C'yan signals from channel 83 on the wcils an additional input signal on the following

Yellow channel 115 ". received the magenta channel 115Λ or the way.

An oscillator 152 supplies a voltage test via a cyan channel 115c of a surface signal channel Ho. ^{Since the i ':} gnalc from the surface scanning 40 a phase shifter circuit 154, which originates in the known manner of the slide 40 through the light point 75, the i': gnalc occurring in the adjustment potentiometer 153 during the mentioned intervals the sinusoidal input signal are a first sinusoidal output surface, the switching process in signal (Fig. 3, signal curve D), which via a verder isolating pin 85 overall so that the light intensifier 155 is fed to the modulator 150, as well as point signals and the Area signals from one another, a second sinusoidal output signal (FIG. 3, signal separates and each exclusively in the light point 45 ), which is fed to the mode signal channel 87 or the area signal channel 116 generator 151 via an amplifier 156. These two sine waves are ied. output signals are of the same frequency (I ₇ F kHz), however,

The FarbkompoiientLn surface signals in ^r 'en ca by 90 ^ phase-shifted (Fig. 3, signal curves L.

Nals 115 «to 115c are dealt with there and and E).

then an area signal 50 Vereiniguiigsslufe The modulator 150 supplied pulse wire Λ

120 supplied, in which they relate in certain ratios according to the instantaneous amplitude of the

put together to form a surface signal mixture that amplitude-modulates the sinusoidal oscillation. Ebensc

will. The pulse A supplied to the modulator 151 arrives at this signal mixture via the line

device 122 in the computer 90, which also relate to the corresponding to the Momenlan amplitude

Yellow, magenta and cyan light point signals from the 55 amplitude-modulated the sinusoidal input oscillation

Channel 87 is receiving. In the computer 90, the modulator 150 supplies the output accordingly

Yellow, magenta and cyan light point signals through a sequence of amplitude-modulated right sides

the area signal modified so that in the corner pulses with a subsequent period of 50 micro

Films 37a to 37d produced color reproduction of the seconds and a sinusoidal modulation envelope

Contrast between the local tone details and the 60 curve, while the modulator 151 has a similar!

contrasting ambient tone of these details, provides pulse train that differs from the output pulse

compared to the lack of modification drought ¹ sequence of the modulator 150 only differs in this

the contrast resulting from the surface signal is increased in that its modulation envelope is in contrast

will. The way the light spot or is 90 out of phase. The two starting

IMilMcnjle »where the surface signals are modified, the pulse sequence of the modulators 150, 151 are ii

<it ι ..Si ₁ Jii thus achieved in color reproduction Fig. 3 for a short interval through the signal

f -. '. ι -and in detail in the introduction, F and G and durcl for a longer interval

:, '.vv: -C-. ! \ -Patent specification? 194 883 explains the signs K and /. reproduced.

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It should be noted that the signals supplied by the modulators 150 and 151 are not simple "carrier-suppressing" double-sided output signals from the push-pull modulator !! represent. Rather, these signals include a corresponding the modulating sinusoids component that causes the ModulationshüIIkurvc each output pulse train in the same manner as the modulating sine wave above and below zero / erläuft (.

The output signals of the modulator 150 and the modulator 151 are used as a separate Hingangssignalc to a ramp generator 160 and a Rainpengeneiator 161. The generators 160 and 161 are ordinary Sägezahncrz.euger (z. B. / iC-Integricrglicder), the corresponding of each input pulse from the Modulator generate a sawtooth signal with a duration corresponding to the duration of the input pulse. The individual saws / teeth rise linearly from zero in a measure proportional to the size of the input pulse and in a direction (positive or negative) that corresponds to the polarity of the input pulse. This linear rise of the saw teeth is terminated in each case (by the reception of a pulse B from the decoder 135 ft via an amplifier 140 /) . This pulse B generates a saw tooth return corresponding to its duration, as a result of which the generators 160, 161 are set in readiness for the generation of new saw teeth. A sequence of amplitude-modulated saw teeth appears at the outputs of the ramp sensors 160 and 161, shown in Figure. 3 for a short interval through the signal curves H and J and for a longer interval through the signal curves M and N. As can be seen from these latter signal curves, the sawtooth sequences generated by the generators 160, 161 have sinusoidal modulation envelopes that are 9 (T against each other are out of phase.

After amplification in amplifiers 162, 163 and in a deflection unit 165, these two sawtooth signals are fed to the A 'deflection terminal 63 and the y-deflection terminal 64 of the cathode ray tube 65.

As can be seen from the signal curves M and N (Fig. 3), the sawtooth signals, superimposed on the primary deflection signals from the synchronizing unit 50 (Fig. 1) , cause the light spot 75 on the original 40 to be intermittently removed from its main scanning path 170 (Fig. 3) , Diagram O) is deflected in a sequence of radial scans 171, which start from the moving location 172 in the main aisle 170, at which the light point 75 would be in the absence of any auxiliary deflection, and which progressively around the location 172, similar to the PPI scanning known from radar technology, rotate. That is, if one considers the location 172 as a stationary point (FIG. 3, diagram P), the light point 75 migrates from this stationary point outwards in a sequence of temporally separated radial paths 173 which are progressively offset clockwise around the point 172 are. After each such outward hike, the light point 75 returns to the point 72 via the return path 174 shown in dashed lines. Since the point 172 is not actually stationary. but rather moves over the color slide 40, the return paths l74 coincide with the radial outward taps 173 of the light point 75 .

The sequence of radial deflections of the light point 75 around the point 172 causes the light point 75 on the color slide 40 to perform a radial scan in a moving surface area 175 , the circumference of which is 1/6 determined by the outermost points of the radial outward readings of the light point 75 . The diameter of this surface area can desirably be 100 times as large as the diameter of the point of light

ίο 75, typically about 0.025 mm (1 mil) in diameter. Each radial trace followed by return of the light point 75 comprises 6.25 microseconds or one eighth of the 50 microsecond deflection period, the remaining 43.75 microseconds of which are the main scanning gcw.dmcl. If the light point 75 moves in the main aisle 170 over the original 40 with a typical scanning speed of 50.8 cm's, each radial forwards movement followed by a return takes place within a period of time which is shorter than the time it takes for the light point to enter the main aisle 170 Traverse pixel, d. Ii an element on the image 40 which is the shape and size of the light spot 75 itself and thus corresponds to a circular spot with a diameter of 0.025 mm (1 mil). Since the surface scanning covers only a small fraction of the total scanning and since each surface scanning forward and reverse takes place within the time that the light point needs to traverse a bicycle element in the main passage 70, this surface scanning only results in a negligibly small loss of im Main scan of detected information result. Therefore, the accurate conversion of all tonal values is 40 in respective signal values of the color component LicHpunktsignale in passages 86a to 86 c do not appreciably affect the original by the Flächenabtaslvorgang.

The values given above namely that the surface area 175 has a diameter a hundred times smaller than the light point 75 , (I ß the travel-return duration per surface deflection is only one eighth of the subsequent period of the surface scanning and that the travel-return time per surface deflection is smaller than the spot diameter, divided by the main gear scanning speed of the light spot, only beispielswei · · are shown. in any case, however, is preferably the surface area 175 of at least 20mA! larger in diameter than the light spot 75, and preferably, in the present state of the art, the duration of each forward-return of the surface scan, at most 25% of the subsequent period of the surface scan and at most as much as the light spot diameter, divided by the deflection speed of the light spot in the main aisle.

Since the Sinusmodulationshüllkurven the Sägezahnsip.nalfolgen have a frequency of 1.8 kHz, and thus a period of 556 micro-seconds by the control unit 100, the angular velocity of the light spot 75 is about the point 172 in the dialabtastung Ra 360 ° per 556 microseconds. The light point therefore passes through the surface area 175 in successive deflection cycles m ^; t for a subsequent period of 556 microseconds for the full cycle. If the subsequent periods of the area scans were equally divisible into this area deflection sequence period (which may possibly be within the framework of the

2812

Invention may be the case), so were the Superimpose radial scans in successive surface deflections and would that formed thereby Spoke pattern stationary in rotation. However, since the exemplary values of 50 microseconds for the area scan sequence period and 556 microseconds for the area deflection follow-up period for a full cycle the smaller period is not equally divisible into the larger period, the radial scanning spoke pattern precesses more sequentially around point 172 in the course Area deflections. This precision results from assuming that for a given first surface deflection a first radial scan at time zero in a reference angular position zero occurs, ten more consecutive scans during this first deflection (or a total of eleven samples) c.o'gen. The time interval between the first of the first eleven samples and the first of the second eleven samples however, 55 (1 microsecond. i.e., ft microseconds less than the full 556 microsecond deflection period. The first surface deflection therefore ends shortly before the full deflection period, and the radial scans In the spoke pattern of the second Ahlenkng, the radial scans hurry in their clockwise position in the spoke pattern after the first deflection by an angle that is initially equal to one Microsecond delay is then progressive increases. The spoke pattern therefore appears to be 3c during the second and subsequent deflections precess or backwards (rl. i.e. counterclockwise i) to rotate. As the first scan of every surface deflection behind the first scan of the previous surface deflection by 6 microseconds lags, the ers'.c is the scan of the ninth deflection by an angle corresponding to 54 microseconds, d. H. precessed backwards in an angular position, which by only 2 microseconds (in angular measure) from that of the eleventh scan of the first steering assumed angular position is separated. The spoke pattern therefore processes over nine surface deflections of radial scans to a sufficient degree. by essentially the entire extent of the surface area 175 to be detected. In the course of the time required for these nine surface deflections the light point 75 in the main aisle 170 has moved linearly by a distance that is slightly shorter than that Nine times the diameter of a picture element.

As can be seen from diagram P in FIG. comprise the parts of the area 175 traversed by the light point 75 during its radial scans, which is only a small fraction of the total area during a deflection of the area add 175 to the area. However, since every I! 'Lenablcnkung 11 such radial scanning are omitted and these Raciialabtastimgen in the same Angular distances are distributed around point 172 (with the exception of the somewhat larger distance between the first and eleventh scans), form the tonal values of the original recorded in these eleven scans 40 nevertheless a representative sample of all toners of the original 40 in the area 175. The tonal values perceived during such a random sampling of the surface area 175 form hence a reliable measure for the middle one. Tonal value of this entire area. The precision this mean pitch scale is further determined by the precision of the spoke pattern Radial scans increased over successive surface deflections. If namely in the first a sequence of surface deflections randomly any significant tonal values of the surface area * 175 should fall between the spokes of the scanning pattern and thereby be lost, provides the precession rotation of the pattern to ensure that these previously lost tonal values are no later than the ninth surface deflection of this sequence, d. H. are recorded at the latest after the period of time that the Light point 75 required for traversing a distance of nine picture elements in the main aisle 170. There this distance is short compared to the diameter of the surface area 175 and there (as will be described below is) the signals derived from successive area scans are integrated, yields dns Area signal mixture a very good approximation of the mean tone value of the entire area 175. at the expense of a delay university: which in the With regard to the purpose for which this signal mixture serves, namely the increase in the local contrast in the finished reproduction, is insignificant.

The sawtooth vibrations. which effect the scanning of the face region 175, respectively (3. waveforms Λ / N and Fig.) of a retrace portion 177 have produced substantially the same duration as the trace portion 178 of the radial Auswärtsublcnkungen of the light spot 75 miles. These sawtooth oscillations therefore differ in their shape from the conventional sawtooth signals, the return interval of which is very short. The use of sawtooth oscillations with a relatively long return interval in the device according to FIG. 2 is advantageous because such long return intervals reduce the high frequency components of the sawtooth signals and thereby facilitate the distortion-free transmission of the signals to the corresponding deflection points in the tube 65. This is especially true when working with electromagnetic beam deflection, in which case the high frequency components of the sawtooth signals are influenced by the high inductive resistance of the deflection coils.

With radial scanning of the surface area 175 by the light point 75 in the described manner is the mean point-by-point illumination of the surface area by the light point over a Deflection cycle "Gaussian" in the sense that the mean intensity of the surface bulging is progressive decreases from the center 172 to the perimeter 176 of the surface area. This is the case because, during each radial scan 173 in the area 175 has constant width as well as constant illumination over its length, through this scanning path halved angle vector of the surface area from the center point 172 in the direction of the circumference 176 constant increases. Hence, if at any given radial distance from point 172 the light is in each Abiastweg 173 as across the width of the corresponding angle sector of the area in this Absland is considered to be distributed in such a way that there is a mean illumination intensity of the entire area results in this distance, this minimized bulge intensity increases monotonously radially outwards away. This is advantageous because it causes an overemphasis on one of the wandering light point 75 and the associated migratory area

15 16

175 hn original scanned tone composition edge area a photoelectron multiplier 204 a, 2046

are directed in the finished reproduction of the original 40 or 204c. By dichroic filters

is avoided. 205 to 208 are the partial rays 203 a, 2036 and

Except for the generation of the surface scans 203 c in the corresponding beam path in a blue effect Hüfsablenksignale for the tube 65 emitted, a green ray or a red ray poured over the control unit 100 further converts the following. The dichroic filters 205 through 208 are in ren functions: their wavelength passband by changing

The control unit generates the angle of incidence of the jet by means of the potentiometer meters 180 a focusing voltage that can be changed by the grinder adjusting the filter. The optical Sy-181 of the potentiometer via line 103 the io system thus enables a selectively variable Focusing control terminals 183 of the tube 65 pull control over the wavelength ranges of the individual leads is in the facility according to Fig. 2, these rays 203 a to 203 c.

Focusing voltage kept constant; however, it can take the output from the photoelectron multipliers 204a,

by selective adjustment of the wiper 181 of the 2046 and 204 c from the corresponding beams he potentiometer winding 184 between the scanning 15 generated yellow, magenta and cyan signal · *

cycles can also be adjusted. after reinforcement in appropriate amplifiers

'Since the radial scans 173 of the light point 75, 209a, 2096 or 209c are assigned to the signal separation stage 85

done at high speed, it is desirable- directs. There these signals reach the inputs

worth, the point of light during the individual outward movement of the corresponding gates 215a, 2156 and 215c To lighten up the intervals of the surface scans, whereof as well as to the inputs of the corresponding gates

however, during returns 174 to mid-216a. 2166 and 216c. The individual gates of the stage

point 172 the light point 75 preferably deleted 85 receive the pulse C as a key signal (Fig. 3)

or should be darkened. Furthermore, the decoder 135c via the amplifier 140c and

During a scanning cycle of the original 40, the intensity of the line 217. Each pulse C spans the act of the light point preferably for a constant duration of a pulse A (ie a radial scanning

th middle brightness value held. outward) and the duration of the immediately following

To this end, the intensity of the beam 70 pulse B (ie the return after the previous is monitored by a device 76 in which the previous path). Furthermore, the individual loads a pellicle or skin 190 a sample of the Lieh pulse C the gates 215a to 215c in the blocked beam via a focusing lens 191, while the gates 216a to 216c are fed into the open photoelectron multiplier 192. The electronic state. The separation stage 85 then works as a tric output signal of this phoioelectron switch, in the following way,
In many cases, it is amplified in the amplifier 193 and connected to the main corridor 170. The light point 75 in the main corridor 170 then runs via the line 77 as a brightness control (Fig. 3, diagram O) , the gates 215a are a signal of a conventional blanking mixer 194 in the 35 to 215 c opened so that the yellow, magenta and unit 100 are fed. This stage 194 receives cyan signals from the color analyzer 80 into which light also passes the pulses A and B from the amplifiers point signal channels 86a to 86c, while 140a and 1406. In the stage 194, the signals are blocked with the gates 216a to 216c. When mixed with an output signal which, on the other hand, receives a pulse C via the line 85, evaluation 101 of the beam intensity control terminal 102 of the 40 to which the gate 215a tube 65 is fed for the duration of this pulse. This output signal has blocked in to 215c and the gates 216a to 216c in a known manner such that it opens the electron so that the yellow, magenta and cyan signals tron beam of the tube 65 controls so that the light from the color analyzer 80 into the surface signal channels point 75 during the radial scans 173 recorded 115 a to 115 c are passed. Since the duration of each one brightens, extinguished during the returns 174 and coincides in pulse C with the duration of a radial trace and the intermediate intervals during its movement of the immediately following return ue point of light in the main aisle 170 set to normal brightness 75, consequently the separating stage 85 causes . Further, the amplitude of the output signal is determined by the signals from the color analyzer 80 in light of stage 194 by the brightness control signal from the dot signals. which are regulated from the main passage scanning of the photoelectron multiplier 192 so that 50 originals originate and the mean brightness of the scanning light point 75 is passed exclusively into the channels via 86 a to 86 c, and area signals that keep a scanning cycle of the original 40 constant by the area scanning of the original 40 will come. and only in channels 115 a to 115 c

The optical system of the color analyzer 80 is one of conductors to be disconnected.

although not the subject of the present invention, 55 contain the light point signal channels 86a to 86c

however, due to its special properties (Fig. 2), an amplifier 220 and a mo-

tion for the device according to the invention short dulator 221, where the variable DC voltage

explained. signals of the relevant channel to an RF carrier

This system receives the modulation as an input variable. Although not shown in Figure 2,

Beam 76, which is deflected in a grid pattern, and through the 60 lead the separate channels for the color components.

Tone values of the original 40 tcn light point signals detected during the scan are passed on by the computer 90,

is intensity modulated. In the color analyzer 80 occurs in which these signals an additional treatment

the beam 76 initially through a condenser lens, for example a tonal value range compression

200, which directs the beam to 5 ° divergence from the sion, color masking, under color removal, etc.

Normal, d. H. 5 ° larger than when the 65 was stationary.

Beam, collimated. Then the beam 76 is contained by the area signal channels 115a-115c

low-absorption beam splitters 201 and 202 in three each a low-pass filter 225, in which the original

Partial beams 203a, 2036 and 203c split up, each borrowed intermittent color components surface

17 '18

signals through integration in continuous signals with a period of 250 microseconds. The impulses are converted. This integration effect sequence is fed to a sawtooth generator 255 and can also extend intermittently over successive scans for the generation of the respective light point 75, so that each cone resets a new sawtooth. This saw-continuous surface signal (with regard to its coloring tooth generator (which is a constant input component) can be the function amplifier that integrates the variable detected in surface area 175 ] mean tonal value over not just one, but multiple, therefore generates a sequence of saw teeth (FIG. 5 , rere samples represented. Signal curve FF) each with a relatively long

The linear outward and a relatively short return pass from the channels 115 a to 115 c

Color component area signals for union and with a period of 250 microseconds.

Stage 120, which includes a mixer circuit 230 , in The Sawtooth Vibrations from Generator 255

which these separate signals come to a surface signal as additional input variables to the

mix appearing on output line 231 , modulators 242 and 243, which also use the

can be added. The mixing circuit 230 is in over 320 kHz sinusoidal oscillation AA or the opposite

Licher way z. B. made up of three potentiometers, 15 via 90 "phase shifted 320 kHz sinusoidal

receive the corresponding surface oscillation BB on their windings. In the modulators 242

Signal voltages are applied and their sliders and 243 are the relevant HF sinusoidal

are connected in common to output 231 . with the corresponding sawtooth vibrations

In this way, amplitude-modulated (by individual verges) so that at the outputs

position of the corresponding wiper) the percent of the two modulators each have an amplitude

tual anieile of the three color component areas of 320 kHz sinusoidal oscillation appears

signals in the resulting surface signal mixture according to the modulation envelope take the form of a sequence of

Desire to be changed. Saw teeth with a period of 250 micro-

That appears in the line 231 has area seconds, the modulation envelopes of the

signal mixture is a variable DC voltage 35 both output oscillations in phase, on the other hand

signal. that in modulator 235 has its sine components phase-shifted by 90 to the same

HF carrier is modulated, with which they are.

Light point signals are modulated. After the up this Auseangssignale of the modulators 242 and modulation f. *! Depends the surface of composite signal 243 are 252 121 where it is supplied to the normally locked gates the line to the computer 90, as area 30 and 253. In each case when a masking signal is received in the manner described in the USA patent pulse of the pulse train EE , these gates 252 are used. 4 and 253, however, are opened so that they each show the circuit diagram of an embodiment of the control pass which can be used for the device according to the period of the relevant modulator output signal FIG. The gate 252 thus provides a sequence unit 100 in which a spiral surface 35 of amplitude-modulated single-period sinusoidal scanning in the form shown in FIG. 5 is generated in detail illustrative oscillation trains with sawtooth modulation enveloping manner. curve (Fig. 5, signal curve t "G). Correspondingly

In Fig. 4 controls a 320 kHz oscillator 240 and a sequence of appears at the output of gate 253

Phase shifter 241, which generates a first 320 kHz sinusoidal amplitude-modulated single-period sinusoidal

oscillation (Fig. 5. waveform AA) and a 40 movement trains (Fig. 5, waveform HH), the temporal

second 320 kHz sinusoidal oscillation (Fig. 5, signal - coincident with the oscillation trains of the sequence GG -

course BB), which phase dicrene against each other by 90, but with regard to the points of the beginning

are shifted, generated. The signal BB comes to and the end of the individual sine periods by 90 °

a push-pull modulator 242. The signal AA is shifted. Since the consecutive

another push-pull modulator 243 and a tenth pulse of the sequence DD, which generate the

Rectangular shaping circuit 422 supplied, which initiate the modulating saw teeth from this supply, except

Signa! a 320 kHz square wave (Fig. f, phase with the ΓΕ pulses that are mil

Signal course CC) in phase with the oscillation AA the sinusoidal oscillation trains from the gates 252

generated. > and 253 coincide, the return of the incoming

This square wave passes from stage 50 individual saw teeth in the interval between 244 to a circuit 250 with an 8-fold binary two consecutive sinusoidal waveforms, counter (pulse counter with partial ratio 8: 1) and one phase-shifted with respect to these. The diode decoding matrix, which follow a first pulse train (FIG. 5, supplied by a 10-fold signal binary counter 251 supplied by the gates 252 and 253 , are therefore free of high-frequency component waveform DD) and a second pulse train 55 which they contain If the or (Fig. 5, signal curve EE) were running; i, the two gates - some of the sinusoidal waveforms of this signal followeri stages 252 and 253, the saw teeth that are normally blocked during the return transition intervals of the modulating gates for the output signals of the modulator 242 occurred.
or the modulator 243 work, is supplied. In these two pulse trains supplied by the gates 252 and 253 , the width of each 60 series of sinusoidal oscillation trains is 3.125 microseconds after each pulse and the Im amplification in the amplifiers 162, 163, 165 over a pulse train period of 25 microseconds. The pulses of the lines 105 and 106 of the Z-deflection terminal 63 of both sequences are temporally supplied by 12.5 microseconds or to the Y-deflection terminal 64 of the cathode rays compared to the pulses of the other tube 65 (FIG. 1). There cause the sine sequence offset. 65 vibration trains a sample scan of the

The 10-fold counter 251 removes nine at a time from originals 40 in surface area 175 through the light

ten pulses each of the sequence DD. The output pulse point 75 in the following way:

The sequence of the counter 251 therefore has a pulse sequence as shown in the diagrams / 'and JJ in FIG.

19th

Obviously, the first oscillation train 260a causes 20% of the total scanning time, that the or 261a of the sequences GG and HH, that the individual light runs and returns of the surface point 75 are terminated almost instantaneously from the main scan when or before the Local gang 170 in a deflection path 262a radially after the light spot 75 in the main scanning path 170 which jumps outside. Then the light point scans 5 a distance of a picture element, and then 75 the original 40 in a ring sector 265 α , the central point-by-point illumination of the concentric to the center 172 of the wandering surface area 175 radially outward progressively the surface area 175 runs. At the end of the decreases, since the linear scanning or deflection oscillation trains 260 a, 261a , the light point speed of the light point 75 with the radius 75 jumps almost instantaneously over a radial backward io of the progressively smaller ring sectors progressive run-off path 263 a, which in the angular position essentially takes. In addition, the ring sector surface coincides with the outward path 262 a , but scanning has the advantage that the time required for this is shorter than this to return to the main aisle 170. Since switching arrangements are relatively simple. Since the wave forms 260 a, is composed by the sawing 261a against "a disadvantage of the ring sector area tooth FF are amplitude-modulated, the ring i ₅ is scanning that the Hilfsablenksignale GG and sector 265 a is not a sector, but an HH for the nearly instantaneous Away Since, furthermore, the oscillation trains 260 «, warming up of the light point 75 over the H'ni- 261α occur when the instantaneous amplitude of the travel and return paths 262α and 263.7 relatively high of the sawtooth FF is greater than any other frequency components must, the vibrations occurring under this sawtooth, ₂ o circumstances can be weakened before the ring sector 265a assumes the radially outermost position in the sense of a deflection of the electron beam dot relative to the center point 172 , so that it is effective in the cathode ray tube that is, on the circumference 176 of the scanned surface area, the radial surface scanning is generally forward 17 5 is located. draw.

The then following ring sector scans 265 /), 25 In the embodiment of 265 c etc. shown in FIG. 6, the output trains that occur during the period of the signal of the oscillator square wave generator stage 130 saw tooth FF are generated by the following sine wave device according to the invention. Since the instantaneous amplitude (FIG. 2) decreases progressively directly to the S-fold counter 250 (FIG. 4) of the sawtooth FF between the individual oscillation trains for the purpose of generating the pulse sequence EF (FIG. 5), they are added. The pulses of this sequence pass through the other ring sectors in their middle line 217 to the signal separating stage 85 (FIG. 2) and the radius is progressively smaller so that they progressively move to the mixer stage 194. In addition, the pulses are shifted radially inward. This process follows EE of the focusing control terminal 183 of the continues until the tenth or smallest tube 65 is fed, where a 5-beam defocusing spiral scan is reached. Then is caused by 35 for the duration of each pulse ^: During a pulse derived from the sequence DD the earth defocusing, the beam is simultaneously initiated by generating a new modulation sawtooth for the intensity control start of a new area scanning cycle by the mixer 194, Terminal 102 of the tube supplied signal is brightened, in which, as before, a sequence of progressively smaller ones is scanned by the simultaneous defocusing and up-spiral ring sectors in the surface area 175. The beam illuminates. Light point 75 over the entire surface area

During the ring sector scans, the 175 is switched during intermittent intervals that start with

Point of light 75 is brightened by applying the pulses EE at the intervals of the linear movement of the focused

Via line 266 of mixer 194 for the purpose of light point 75 in main scanning path 170 (Fig. 7a)

Lighter control or intensification of the electron 45 alternate. Because of this lighting up or

The beam of the tube 65 for the duration of each surface appearance thus becomes the entire in each case

scanning are fed. The pulses EE are surface area 175 due to the defocused light

Also detected via line 217 of the signal separation stage point. The one from the color analyzer

85 (Fig. 1 and 2) where they cause 80 (Fig. 1 and 2) from the light spot 75 during

(as already described) the in.- the main aisle 50 of the focused main aisle scanning and the de-

scanning of the original 40 originating light point-focused area scans derived signals

signals and those originating from the area scanning are in the signal separation stage 85 ^ F i g. 2) sub

the surface signals on different channels over control by the over the line 217 (Fig. 6)

will wear. On the other hand, the pushbutton signal supplied to the device occurs separately,

according to Fig. 4, in contrast to the F.inrichtung 55 The method of defocusing surface scanning

according to Fig. 2, no blanking of the electron beam according to FIG. 6 offers the same advantages as that

after each area scan and no Beauf method according to FIG. 4, and it also results in unity

Impact of the Treiinstufe 85 with a key signal medium point-by-point illumination of the area

over an interval representing the duration of the lightening and area 175, progressively from the midpoint 17]

the duration of the blanking of the electron beam 60 to the outer circumference 176 decreases (FIG. 7b). Eir

overstretched. Disadvantage of the method according to FIG. 6 ordered in it

The ring sector surface scanning in the device that it is difficult to determine the surface of the de

4 offers, similar to the radially focused light point 75 concentric to the nominal

surface scanning in the device according to FIG. 2, position of the moving focused point of light

the advantages of keeping the scanned area 65 in the main aisle 170.

at least 20 times, preferably 100 times or more. The device according to FIG. 8 differs

is larger in diameter than the light point 75, of which according to FIG. 6 in so far as the pulses El

that the duration of the area scan is less than (Fig. 5) instead of the focus control terminal

Tube 65 are fed as key signals to the gates 252, 253 (as in FIG. 4). This normally locked gates are respectively opened by the pulses EE, so that in each case the x- and y-Ablenkklcmmcn the tube are fed 65 Rauschsignalc for the duration of the pulses of separate, coupled to the Signalcingänge of the gates 252 and 253 noise generators 272 or 273 can be generated. As a result, during the intermittent intervals of the occurrence of the pulses EE, the light point 75 is deflected from the main aisle 170 in such a way that it arbitrarily over- scans a surface approximating the area 175 on the original 40 (FIG. 9a). This arbitrary scanning results in a mean point-by-point concavity of the recorded area, which decreases progressively radially outward from its center point (FIG. 9b).

The device according to FIG. 10 operates with a two-beam cathode ray tube 280, the two electron beams of which are hereinafter referred to as the left-hand beam and the right-hand beam. The deflection of the left-hand beam is controlled only by the primary deflection signals supplied by the synchronizer 50 (FIG. 1) via the lines 59 and 61. This beam thus generates a focused light point 281 on the original 40 , which only scans the original in the main aisle in the form of a raster. The right-hand beam deflected by the same primary deflection signals generates a light point 282 on the original 40 which, for the sake of clarity, is shown as ncln-ii located at the light point 28i , but in reality lies in its nominal position concentric to the light point 281. The tube 280 can somehow be controlled in the manner already described (according to FIGS. 2, 4, ft or 8) by signals from a suitable control unit 100 so that the light point 282 the original 40 in a surface area centered on the main scanning path of the light point 281 scans. Preferably, however, the area scanning by the light point 282 takes place continuously instead of intermittently in time.

In the case of continuous area scanning of the original, the light point signals originating from the main aisle scanning by the light point 281 and the area signals originating from the area scanning by the light point 282 appear simultaneously in the color analyzer 80 downstream in the common channel 83. These light point and area signals can therefore not be based the time-share relationship will be severed. In order to enable separation of these signals, the intensity control voltage for the left beam of the tube 280 is modulated in the modulator 290 by a sinusoidal oscillation of the frequency / generated by an oscillator 291, while the intensity control voltage for the right beam in the modulator 292 is modulated by an oscillator 293 Sinusoidal oscillation is modulated, the frequency / j of which deviates significantly from the frequency /. As a result, the intensities of the left-hand beam and the right-hand beam are modulated with the frequencies /, or f _s , so that the light point signals and the surface signals appear in channel 83 as modulation of two carriers with the frequencies /, or f. ₂ . Those of the mixed light point and area signals which correspond to yellow, magenta and cyan are fed from a separating stage 295 and there to a bandpass filter pair 300, 301, a bandpass filter pair 302, 303 and a bandpass filter pair 304, 305 , respectively. Of these six band-pass filters in stage 295 , the even-numbered 300, 302 and 304 are permeable for signals with a center frequency of /, while they block signals with a center frequency that differs significantly from this. Thus, the yellow, magenta and cyan light point signals pass through the filters 300, 302 and 304 into the

ίο channels 86a, 86ft and 86r (Fig. 1), while the surface signals are blocked by these filters. In contrast, the odd-numbered filters 301, 303 and 305 are permeable to signals with the center frequency /., While they block signals with a center frequency that differs significantly from /. It pass through these latter Bandpaßfiller the yellow, magenta and cyan Flächcnsignale into the channels 115a to 115r (Fig. 1), while the light spot signals from these channels locked wcrden After separation in step 295, the light point and Flächcnsignale demodulated and then used in the color separation exposure system in the manner described in connection with FIG.

Instead of the two-beam tube 280 , two single-beam cathode ray tubes can, if desired, also be used in the device according to FIG 40 keys.

The device according to FIG. 11 is

an expansion of the device according to Fig. I,

in which a so-called pull-out or »knock-out mask« is used. In Fig. II

For example, the primary deflection signals are fed from the synchronization unit 50 via the lines 310 and 311 to an additional single-beam cathode ray tube 315 , which generates a light spot 317 on the mask 316. The light point 317 scans over the mask synchronously with the scanning of the original 40 (FIG. 1) by the light point 75 and with the scanning of the films 37a to 37d by the rays 36a to 36 </, in a grid that the has the same shape as the scanning grid for the original

40 and films 37a to 37 d. By means of gain control buttons 318 and 319 attached to the tube 315 for the X and X deflection, the size of the scanning raster of the mask 316 can be adjusted. In this way, the ratio between the scanned area of the mask 316 and the scanned area of the original 40 and / or the size of the color separation images exposed on the films 37a to 37rf (FIG. 1) can be changed as desired by adjusting the controls 318 and 319 .

The knock-out mask 316 consists of colored lettering or other details on one more transparent subsurface. As disclosed in U.S. Patent Application Serial No. 649 621 (filed on June 28, 1967) by the same applicant,

details in different parts of the mask 316 correspond to different shades of color (including black) so that different color codings can be obtained.

The hue values detected by scanning the mask 316 by the light point 317 are shown in FIG a color analyzer 320 similar to analyzer 80 (Fig. 1) is analyzed. The color analyzer forms from the perceived hue values

12th

Yellow, magenta, and cyan signals which are provided on lines 321, 322, and 323 to an ink selector 324 (described in detail in the aforementioned U.S. patent application). Whenever a detail on mask 316 is scanned, selector 324 provides signals to gates 325a through 32Si / which block the flow of yellow, magenta, cyan and black image signals from processing unit 45 to film recorder 20. At the same time, the selector 324 is controlled by the relative intensities of the signals in the lines 321 to 323 so that it selects one from a plurality of selectable color sources 326 to 329, which then the film imagesetter 20 with a fixed voltage substitute signal for each which supplies four image signals normally fed to the user 20 by the processing unit 45. This imagesetter supplied to a selected color replacement source signals cause the exposure of the Bildtcilen FiImRn 37a to 37 d so that in the final reproduction of a ao self- or inherent color is formed of the sampled just on the mask 316 colored details. Since any one of the color sources 326 to 329 can be set to generate a set of substitute signals, each of which is selectively adjustable in value as, and since each of these sources is represented by a corresponding one of the four colors in which individual details on the mask 316 are toned , any detail on the mask can be reproduced in any of four different colors (by corresponding color coding) and, from the color standpoint, does not need a specific relationship between the color in which the detail is coded and the color, in which this detail is reproduced.

The invention is equally applicable to black and white reproductions as to color reproductions. Further, if the diameter of the scaled area is reduced to about three times of the diameter of the scanning light point, the method according to the invention of area scanning and area signal generation can be used to produce unsharp masking signals and / or edge enhancement signals to accentuate the tone density edges scanned by the light spot. Even if the scanned surface area is much larger in diameter than the point of light, can be used for extraction a surface masking signal simultaneous un sharp masking and lifting signals with the help of suitable Data separation processes are generated.

Claims (33)

Claims: 55 1. Facsimile apparatus in which an original is made by means of a scanning spot and a surrounding area Surrounding area of at least twenty times the diameter is scanned and off the light rays of the scanning spot and the surrounding area coming from the original Scanning spot signals and environment signals are generated and in which the scanning spot signals with The help of the surrounding signals to increase the display contrast can be modified and the Playback signals fed to an exposure arrangement for exposing a reproduction material are, characterized in that as a scanning spot in known per se Way, the grid-shaped deflected luminous point of a cathode ray tube (65) serves that further the cathode ray generating the luminous spot is modulated in such a way that it is outside the scanning spot also creates the surrounding area on the screen of the cathode ray tube that continues to the a converter converting the light beams into electrical signals through the cathode ray modulator controlled signal separation circuit (85) for deriving the scanning spot signals and the Environment signals from the output signals of the converter containing these two pieces of information is refilled. 2. Facsimile apparatus according to claim 1, wherein the relative movement of the exposure arrangement with respect to the reproduction material drawn on a rotatable drum with the movement the scanning of the original is synchronized, characterized in that a synchronizer (54, 57) for converting from the rotational movement of the drum (21) with the reproduction material and the longitudinal movement of the exposure assembly (carriage 27) derived movement signals into horizontal and vertical deflection signals is provided for the cathode ray. 3. Facsimile apparatus according to claim 1, characterized in that the cathode ray is modulated is that the brightness of the on the screen the cathode ray tube appearing environment area decreases progressively towards the outside. 4. Facsimile apparatus according to claim 1, characterized in that the scanning spot scanning and the surrounding area scanning of the original takes place alternately. 5. Facsimile apparatus according to claim 3, characterized in that the duration of a Umfelu area scan between two successive scanning spot scans at most equal to the diameter of the scanning spot by its scanning speed over the original. 6. Facsimile apparatus according to claim 4, characterized in that the duration of a surrounding area scan between two successive scanning spot scans is at most equal to 25% of the total time of scanning the original is. 7. Facsimilege.it according to claim 4, characterized in that the cathode ray modulator a source of clock signals containing separate time intervals for the peripheral area scan set in such a way that the scanning spot and the environment signals in the common processing channel (83) are nested in time; and that the signal separation circuit (85] includes a switch arrangement that synchronizes with the time-division multiplex relationship of the signals Scanning spot and environment signals on a scanning spot signal channel (87) or an environment signal channel (116) switches. 8. Facsimile apparatus according to claim 7, characterized in * that during each environment area scanning interval the original is scanned in the entire surrounding area (175). 9. Facsimile machine according to spoke 8, dadurcl 209 652/47: 2812 characterized in that the scanning spot scanning at focused beam and that the cathode ray modulator contains an arrangement which under control of the clock signals the beam during each environmental area scan interval defocused. 10. Fakshnilgerät according to claim 8, characterized characterized in that the cathode ray modulator includes an arrangement which is under control by the individual clock signals the beam in orthogonal directions by noise signal c distracts. 11. Facsimile apparatus according to claim 7, characterized characterized in that the original during successive surrounding area scans in different, non-overlapping parts of the surrounding area is scanned. 12. Facsimile apparatus according to claim 11, characterized characterized in that the cathode ray modulator has an arrangement for generating a first and a second beam deflection signal during each of said intervals, an array for the amplitude modulation of these two beam deflection signals, such that one in each signal Change in amplitude over a period of time spanning a sequence of said intervals is generated, as well as an arrangement for supplying the two modulated beam deflection signals an contains two corresponding orthogonal beam deflection assemblies. ij. Facsimile machine according to claim 12, daduiLM characterized in that the two beam deflection signals sawtooth signals, each with a corresponding by two 90 'phase-shifted sinusoidal signals are modulated and with their Period span a sequence of said intervals such that the modulated signals emitting the point of light in the surrounding area radially from the center of the surrounding area and deflect angular progressively offset paths. 14. Facsimile device according to claim 12, characterized in that the two beam deflection signals are 90 ° phase-shifted sinusoidal signals, each marked by a Period of time are monotonically modulated in the amplitude changing signal, such that by the modulated signals of the point of light in progressive radial from the center of the surrounding area offset ring sectors is deflected. 15. Facsimile device according to claim 4, characterized in that the beam during the ambient area scanning intervals is brightened more than during the scan spot scan intervals. 16. Facsimile apparatus according to claim 1, characterized in that the Kaihodenstrahlröhre two beams for scanning the scanning spot on the one hand and scanning the surrounding area on the other generated. 17. Facsimile device according to claim 16, characterized in that the scans for the Scanning spot and the surrounding area take place simultaneously. 18. Facsimile apparatus according to claim 16, characterized in that the cathode ray modulator an arrangement for the intensity modulation of the two beams with two different frequencies and that the signal separation circuit has selective filters which the scanning spot signals the one and the environmental signals of the other two frequencies from the common Routing the processing channel into the corresponding separate channels for these signals. 19. Facsimile apparatus according to claim 1 and 2, characterized in that the scanning spot scanning by deflecting a beam of the cathode ray tube in at least one direction it follows that the electrical output signal an exposure arrangement for exposing an in a first direction mechanically moved photosensitive image recording arrangement relative to this energized and that an arrangement for synchronizing the beam deflection in one direction is provided with the relative movement of the image pickup arrangement in the first direction. 20. Facsimile apparatus according to claim 19, characterized in that the scanning spot scanning by deflecting the beam in two mutually perpendicular directions with raster-shaped original scanning takes place that the drum (21) by mechanical means relative to the exposure arrangement (35a to 35c /) is moved in two mutually perpendicular directions, and that the Synchronizer (54, 57) deflecting the beam in the second direction with the relative movement the drum (21) is synchronized in the second direction. 21. Facsimile apparatus according to claim 1, for scanning a color image, characterized by a color analyzer (80) known per se for deriving several different color components Scan spot signals from the scan square scan of the original. 22. Facsimile apparatus according to claim 21, characterized in that the color analyzer (80) from the environment area scan derives several different color component environment signals. 23. Facsimile device according to claim 22, characterized in that the color component environment signals in a known manner are combined to form an environmental signal mixture and that this environmental signal mixture then with each of the different color components - Abtas'.rlecksignale combined to corresponding output signals will. 24. Facsimile device according to claim 1, characterized in that individual in the surrounding area Samples specific parts of it during a series of intervals to produce a Cycle of scans in the entire surrounding area in a sequence encompassing the interval Period of time with progressive shifting of the individual scans. 25. Facsimile apparatus according to claim 24, characterized in that the surrounding area scanning is carried out with the aid of sawtooth signals which are supplied to two arrangements which deflect the beam of the cathode ray tube arrangement in orthogonal directions, in such a way that a radial scanning takes place from the center of the surrounding area during each of said intervals ; and that the progressive shifting of the scans takes place with the aid of two ^{sinusoidal signals phase-shifted by 90 "1} with respect to one another, each with a period comprising the said interval sequence, which the two sawtooth signals 2812 giialc amplitude modulated in such a way that the Radial scanning are progressively angularly shifted around the center of the surrounding area. 26. Facsimile apparatus according to claim 25, characterized in that the time-separated sawtooth signals Have a triangular shape with kinlauf and return of approximately the same duration. 27. Faksirnilgerät according to claim 26, characterized in that the beam during each The sawtooth is brightened in the forward and blanked in the reverse. 28. Facsimile device according to claim 24, characterized in that the environment area scanning is carried out with the aid of two sinusoidal signals phase-shifted by 90 ° with respect to one another with a period comprising at most one of said intervals, which arrangements for deflecting the beam in mutually orthogonal directions are supplied during these intervals that during each of the intervals a waste _ao sampling is performed in a ring sector to the center of the Umfeldbercichs, and in that the progressive displacement by means of a in its amplitude monotonically over a said interval sequence comprehensive time-varying signal as occurs which modulates the two sinusoidal signals , in such a way that the individual ring sector scans are shifted progressively in a direction radially towards the center of the circumferential area. 29. Facsimile apparatus according to claim 28, characterized in that the monotonically changing Signal is formed by the edge of a sawtooth signal, such that the ring sector scans spiral. 30. Faskimilgerät according to claim 29, characterized in that the return of the sawtooth signals is short compared to the edge forming the trailing edge and that the phase of the sawtooth signals is set with respect to the Ring SektorabtasüVervalle so that the return takes place between two consecutive of the intervals mentioned. 31. Facsimile apparatus according to claim 24, characterized in that the second electrical signal is integrated so that this signal is continuous between the intermittent intervals runs. 32. Facsimile device according to one of the preceding claims for scanning colored Images, characterized by a per se known color analyzer (80) for deriving several various color component light spot signals from the scanning spot scanning as well as several different color component surrounding signals from the surrounding area scanning de? Image, wherein the treatment of the different color component signals takes place according to claim 23. 33. Facsimile device according to one of claims 1 to 32, characterized in that the order Field area scanning in each case samples of the surrounding area are recorded. For this purpose 3 sheets of drawings 2812