EP0016234A1 - Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition - Google Patents
Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition Download PDFInfo
- Publication number
- EP0016234A1 EP0016234A1 EP19780101472 EP78101472A EP0016234A1 EP 0016234 A1 EP0016234 A1 EP 0016234A1 EP 19780101472 EP19780101472 EP 19780101472 EP 78101472 A EP78101472 A EP 78101472A EP 0016234 A1 EP0016234 A1 EP 0016234A1
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- EP
- European Patent Office
- Prior art keywords
- cathode ray
- ray tube
- reproduction quality
- printed matter
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/02—Sensitometric processes, e.g. determining sensitivity, colour sensitivity, gradation, graininess, density; Making sensitometric wedges
Definitions
- the invention relates to a device and a method for visually checking the reproduction quality of drawing elements which can be exposed to light-sensitive photo material by means of a cathode ray tube.
- one group contains errors in the mechanical adjustment and positioning of individual letters and entire lines.
- a second group includes errors in the optical transmission, that is in the exposure and development of the text columns. This group mainly includes the blackening or density, the line thickness change and the font sharpness.
- a change in the weight of the lines manifests itself in the fact that individual lines or entire text groups appear bolder or leaner than the surrounding text. This is perceived as unattractive by graphic specialists and also by non-specialists, since it makes the overall impression of a printed matter appear restless and neglected. In addition, the legibility of such a text is reduced, since the reader believes that when he finds a bold line, he will find an intended emphasis on the text.
- the blackening or density on photographic paper should be like this be so high that there is such a high contrast between the drawing elements and the paper white that it enables a photographic recording on a graphic film.
- Line thickness change and density are two characteristics that run largely parallel, which means that a change in the line thickness can also be expected to change the density.
- the measuring microscopic method a microscope is used, which is equipped with an eyepiece screw micrometer. After finding a suitable measuring point, the line width can be read on the scale division in the eyepiece.
- this method is subject to a certain degree of uncertainty when determining the effective line thickness.
- the densitometric method With the densitometric method, the area coverage of a grid field exposed on the photo setting machine is measured to control the change in line thickness. If the individual points or lines of the grid widen, the area coverage increases, the field appears darker optically and a higher measured value can be determined with the densitometer. With the microdensitometric method, the density is measured across the entire width of the line to be measured with a measuring gap opening of 0.5 to 5 continuously sampled and recorded in function of the location coordinate for this at a reasonable sc hlossenen writing instrument. The line thickness and the density can then be measured or read from the recorded density profile.
- the outlined goal is achieved with the invention outlined below.
- This is characterized in that a device is built into the photo setting machine, which consists of 3 different halftone dots and that a method is used to suitably combine the 3 halftone dots and allows a control field to be exposed and developed.
- the control field is exposed like the normal text at the beginning or at the end of a text column. If conditions occur during the exposure or development process which result in a change in density and line thickness, the terms "overexposed” or “underexposed” can be recognized or read in the control field, depending on whether it is an increase in density - and line weight values or a reduction thereof. If there is no change in density and line thickness, the control field appears as a neutral gray area, which in turn can be determined very easily and with the naked eye.
- the control device is characterized by the creation of 3 surface elements, so-called raster points, which differ in their reaction to changed processing conditions.
- a surface element was constructed for each of the 3 processing areas; which takes advantage of the special circumstances of the area in question.
- This behavior can be achieved by incorporating latent reinforcements in the positive element and latent weak points in the negative element. These positions can be described as latent because their effectiveness is not in the normal range.
- the normal element changes only slightly within the entire processing range (FIG. 1).
- the positive element changes in the negative area very similarly to the normal element, but shows a clear tendency to enlarge its area in the positive area (FIG. 2).
- the negative element also changes very similarly to the normal element in the positive region, but shows a clear tendency in the negative region to reduce its area (FIG. 3).
- FIG. 4 shows the tonal value behavior of the 3 elements to one another within a large processing range.
- FIG. 6 A control field was realized in FIG. 6, which reveals the terms +++ OVER-EXPOSED +++ and --- UNDER-EXPOSURE ---, depending on whether the text column was exposed with too high or too low intensity. If, on the other hand, the exposure corresponds to the usual values that the photosetting manufacturer has designated as correct, the control field appears as a neutral gray area.
Abstract
Description
Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur visuellen Kontrolle der Wiedergabequalität von Zeichnungselementen, welche mittels einer Kathodenstrahlröhre auf lichtempfindliches Fotomaterial belichtet werden können.The invention relates to a device and a method for visually checking the reproduction quality of drawing elements which can be exposed to light-sensitive photo material by means of a cathode ray tube.
Die Verwendung einer Kathodenstrahlröhre für die Herstellung von Druckvorlagen findet man heute auf zwei Gebieten, nämlich
- - bei der Herstellung von Filmsatz und
- - bei der Faksimile-Fernübertragung von Druckvorlagen, z.B. Zeitungsseiten über Telefonleitungen.
- - in the production of film typesetting and
- - for the facsimile remote transmission of print templates, eg newspaper pages via telephone lines.
In naher Zukunft dürfte auch die Ganzseitenbelichtung von Zeitungssatz auf Fotopapier oder gar direkt auf Druckplatten ein weiteres Anwendungsgebiet der Kathodenstrahlröhre werden. Die vorliegende Patentbeschreibung entstand aufgrund der praktischen Verwirklichung des Kontrollverfahrens bei der Herstellung von Schriftsatz auf Fotopapier.In the near future, full-page exposure of newspaper sets on photo paper or even directly on printing plates is likely to become another area of application for the cathode ray tube. The present patent description was created on the basis of the practical implementation of the control process in the production of typesetting on photographic paper.
Die Herstellung von Schriftsatz auf fotografischem Wege findet in der grafischen Branche eine immer grössere Verbreitung und Bedeutung. Es darf heute angenommen werden, dass der Bleisatz sukzessive durch den Filmsatz abgelöst werden wird. Neben den wirtschaftlichen und technologischen Vorteilen des Filmsatzes ist dieser jedoch mit dem Problem der Qualitätssicherung behaftet.The production of typesetting by photographic means is becoming increasingly widespread and important in the graphics industry. Today it can be assumed that the lead type will be successively replaced by the film type. In addition to the economic and technological Advantages of the film set, however, is associated with the problem of quality assurance.
Beim Kathodenstrahlfotosatz wird heute mit den folgenden Elementen gearbeitet:
- - Schriftspeicher auf Magnetkern- oder Halbleiterbasis zum Abspeichern der Bildinformation.
- - Lichtquelle in Form einer Kathodenstrahlröhre mit extrem feiner Auflösungsdichte.
- - Optisches Element, welches das auf der Kathodenstrahlröhre projizierte Zeichen auf das Fotomaterial abbildet.
- - Einer oder zwei Kassetten zur Aufnahme von Film oder Fotopapier.
- - Magnetic-core or semiconductor-based font memory for storing the image information.
- - Light source in the form of a cathode ray tube with extremely fine resolution density.
- - Optical element which maps the character projected onto the cathode ray tube onto the photographic material.
- - One or two cassettes to hold film or photo paper.
Unter den qualitätsbestimmenden Merkmalen der Schriftwiedergabe findet man zwei Gruppen von Mängeln: eine Gruppe beinhaltet Fehler in der mechanischen Justierung und Positionierung von einzelnen Buchstaben und ganzen Zeilen. Eine zweite Gruppe umfasst Fehler bei der optischen Uebertragung, also bei der Belichtung und Entwicklung der Textspalten. Zu dieser Gruppe zählen hauptsächlich die Schwärzung oder Dichte, die Strichstärkenänderung und die Schriftschärfe.There are two groups of deficiencies among the quality-determining features of font rendering: one group contains errors in the mechanical adjustment and positioning of individual letters and entire lines. A second group includes errors in the optical transmission, that is in the exposure and development of the text columns. This group mainly includes the blackening or density, the line thickness change and the font sharpness.
Eine Strichstärkenänderung äussert sich darin, dass einzelne Zeilen oder ganze Textgruppen fetter oder magerer erscheinen als der umliegende Text. Dies wird von grafischen Fachleuten und auch von Nichtfachleuten als unschön empfunden, da dadurch das Gesamtbild einer Drucksache unruhig und ungepflegt wirkt. Ausserdem wird die Lesbarkeit eines solchen Textes herabgesetzt, da der Leser beim Auffinden einer fetteren Zeile im ersten Moment glaubt, eine beabsichtigte Hervorhebung des Textes vorzufinden.A change in the weight of the lines manifests itself in the fact that individual lines or entire text groups appear bolder or leaner than the surrounding text. This is perceived as unattractive by graphic specialists and also by non-specialists, since it makes the overall impression of a printed matter appear restless and neglected. In addition, the legibility of such a text is reduced, since the reader believes that when he finds a bold line, he will find an intended emphasis on the text.
Die Schwärzung oder Dichte auf Fotosatzpapier sollte so hoch sein, dass zwischen den Zeichnungselementen und dem Papierweiss ein so hoher Kontrast entsteht, dass damit eine fotografische Aufnahme auf einen grafischen Film ermöglicht wird.The blackening or density on photographic paper should be like this be so high that there is such a high contrast between the drawing elements and the paper white that it enables a photographic recording on a graphic film.
Strichstärkenänderung und Dichte sind zwei Merkmale die weitgehend parallel verlaufen, was bedeutet, dass bei einer Veränderung der Strichstärke auch eine Veränderung der Dichte erwartet werden kann.Line thickness change and density are two characteristics that run largely parallel, which means that a change in the line thickness can also be expected to change the density.
Für die Kontrolle der genannten Merkmale sind bisher drei Methoden bekannt:
- l. Die messmikroskopische Methode für die Kontrolle der Strichstärkenänderung.
- 2. Die densitometrische Methode für die Kontrolle der Dichte und der Strichstärkenänderung.
- 3. Die mikrodensitometrische Methode für die Kontrolle der Dichte und der Strichstärkenänderung.
- l. The measuring microscopic method for checking the line thickness change.
- 2. The densitometric method for the control of the density and the change of line thickness.
- 3. The microdensitometric method for the control of the density and the line thickness change.
Bei der messmikroskopischen Methode wird ein Mikroskop verwendet, welches mit einem Okular-Schraubenmikrometer ausgerüstet ist. Nach Auffinden einer geeigneten Messstelle kann die Strichstärke auf der Skalaeinteilung im Okular abgelesen werden. Da aber Anfang und Ende des zu messenden Strichs auf der Papierspalte durch die mangelnde Randschärfe nicht genau eruiert werden können, unterliegt diese Methode einer gewissen Unsicherheit beim Festlegen der effektiven Strichstärke.In the measuring microscopic method, a microscope is used, which is equipped with an eyepiece screw micrometer. After finding a suitable measuring point, the line width can be read on the scale division in the eyepiece. However, since the beginning and end of the line to be measured on the paper column cannot be determined exactly due to the lack of edge sharpness, this method is subject to a certain degree of uncertainty when determining the effective line thickness.
Bei der densitcmetrischen Methode wird für die Kontrolle der Strichstärkenänderung der Flächenbedeckungsgrad eines auf der Fotosetzmaschine belichteten Rasterfeldes gemessen. Verbreitern sich die einzelnen Punkte oder Linien des Rasterfeldes, so erhöht sich der Flächenbedeckungsgrad, das Feld erscheint optisch dunkler und es kann mit dem Densitometer ein höherer Messwert ermittelt werden. Bei der mikrodensitometrischen Methode wird die Dichte über die ganze Breite des zu messenden Strichs mit einer Messspaltöffnung von 0,5 bis 5
Alle der drei beschriebenen Methoden haben den Vorteil dass exakte Messwerte vorliegen, die nicht der Subjektivität des menschlichen Auges unterworfen sind. Für die Kontrolle sind jedoch teure und kompliziert zu handhabende Messge- räte erforderlich, für deren fachgerechte Bedienung das grafische Personal nicht ausgebildet ist. Ein weiterer Nachteil, insbesondere bei der erst- und letztgenannten Methode ist der enorme Zeitaufwand, der für den Messvorgang benötigt wird.All of the three methods described have the advantage that there are exact measurement values that are not subject to the subjectivity of the human eye. But are expensive to control and difficult to handle Messge- r Aete required, the graphical staff is not trained in their proper use. Another disadvantage, especially with the first and the last-mentioned method, is the enormous amount of time that is required for the measuring process.
Stellt man sich die zukünftige technische und personelle Organisation in einer Zeitungssetzerei vor, wo die Satzspalten nicht mehr ausschliesslich von typografisch ge- schulten Fachleuten produziert werden und wo in einer Minute mehrere Textspalten belichtet und entwickelt werden können, so drängt sich ein Kontrollverfahren auf, welches durch folgende Merkmale gekennzeichnet ist:
- 1. Für die Kontrolle werden keine Messgeräte benötigt.
- 2. Das Kontrollergebnis kann auf einen einzigen Blick, ohne jegliche Kenntnisse von Vorschriften, welche das Kontrollsystem betreffen und ohne jegliche fachlichen Kenntnisse festgestellt werden.
- 3. Das Feststellen des Kontrollergebnisses bedarf keiner weiteren Hilfsmittel wie Fadenzähler oder Lupe,
sondern kann aus normalem Betrachtungsabstand und -winkel erfolgen.If you imagine the future technical and human resources organization present in a Zeitungssetzerei where the set columns overall not only of typographically s are chulten professionals produced and where exposed in a minute, several columns of text, and can be developed as a control method arises as to which is characterized by the following features:
- 1. No measuring devices are required for the control.
- 2nd The control result can be determined at a single glance, without any knowledge of regulations that affect the control system and without any specialist knowledge.
- 3rd The determination of the control result does not require any additional aids such as thread counters or magnifying glasses,
but can be done from a normal viewing distance and angle.
Das umrissene Ziel wird mit der nachstehend umschriebenen Erfindung erreicht. Diese ist dadurch gekennzeichnet, dass der Fotosetzmaschine eine Vorrichtung eingebaut wird, welche aus 3 verschiedenen Rasterpunkten besteht und dass ein Verfahren zur geeigneten Kombination der 3 Rasterpunkte angewendet wird und erlaubt, ein Kontrollfeld zu belichten und zu entwickeln. Das Kontrollfeld wird wie der normale Text am Anfang oder am Ende einer Textspalte mitbelichtet. Treten während dem Belichtungs- oder Entwicklungsvorgang Bedingungen ein, die eine Dichte- und Strichstärkenänderung zur Folge haben, so können im Kontrollfeld die Begriffe "Ueberbelichtet" oder "Unterbelichtet" erkannt, bzw. gelesen werden, je nachdem ob es sich um eine Erhöhung der Dichte-und Strichstärkenwerte oder um eine Verringerung derselben handelt. Tritt keine Dichte- und Strichstärkenveränderung ein, so erscheint das Kontrollfeld als neutral graue Fläche, was wiederum sehr einfach und von blossem Auge festgestellt werden kann.The outlined goal is achieved with the invention outlined below. This is characterized in that a device is built into the photo setting machine, which consists of 3 different halftone dots and that a method is used to suitably combine the 3 halftone dots and allows a control field to be exposed and developed. The control field is exposed like the normal text at the beginning or at the end of a text column. If conditions occur during the exposure or development process which result in a change in density and line thickness, the terms "overexposed" or "underexposed" can be recognized or read in the control field, depending on whether it is an increase in density - and line weight values or a reduction thereof. If there is no change in density and line thickness, the control field appears as a neutral gray area, which in turn can be determined very easily and with the naked eye.
Die nachfolgende Beschreibung soll die Funktionsweise der Kontrollvorrichtung erläutern.The following description is intended to explain the functioning of the control device.
Es ist aus der Silbersalzfotografie bekannt, dass ein sichtbares Silberbild nur durch die Kombination der beiden Prozesse Belichtung und Entwicklung entstehen kann, wobei beide Prozesse in ihrer Intensität aufeinander und auf das Fotomaterial abgestimmt sein müssen und jede Intensitätsveränderung einer der beiden Prozesse ein verändertes Resultat hervorbringt. Vor allem unterschiedliche Belichtungsintensitäten verursachen beim Fotosatz Dichte- und Strichstärkenänderungen, das heisst, die Buchstaben erscheinen fetter und dunkler bei erhöhter Intensität und werden grau und magerer bei geringerer Belichtungsintensität. Es gibt daher für die Herstellung der Fotosatz-Textspalten einen Verarbeitungsbereich, in welchem ein Optimum an Schriftqualität erreicht werden kann. Dieser Bereich sei im folgenden Normalbereich genannt. Im weiteren gibt es einen Bereich, in welchem eine Strichverbreiterung stattfindet und einen Bereich in welchem eine Strichverschmälerung stattfindet. Diese Bereiche seien im folgenden Positivbereich und Negativbereich genannt.It is known from silver salt photography that a visible silver image can only be created by combining the two processes of exposure and development, whereby the intensity of both processes must be matched to each other and to the photographic material, and each change in intensity of one of the two processes produces a different result. Above all, different exposure intensities cause density and line thickness changes in the photo set, which means that the letters appear fatter and darker with increased intensity and turn gray and leaner with lower exposure intensity. There is therefore a processing area for the production of photo typesetting columns in which the optimum in font quality can be achieved. This range is called the normal range in the following. Furthermore, there is an area in which a line broadening takes place and an area in which a line narrowing takes place. These areas are referred to below as positive areas and negative areas.
Die Kontrollvorrichtung ist erfindungsgemäss gekennzeichnet durch die Schaffung von 3 Flächenelementen, sog. Rasterpunkten, die sich in ihrer Reaktion auf veränderte Verarbeitsbedingungen unterscheiden. Für jeden der 3 Verarbeitungsbereiche wurde ein Flächenelement konstruiert; welches sich die speziellen Gegebenheiten des betreffenden Bereichs zunutze macht. Diese Verhaltensweise ist dadurch zu erreichen, indem beim Positivelement latente Verstärkungen und beim Negativelement latente Schwachstellen eingebaut werden. Diese Stellen können deshalb als latent bezeichnet werden, weil deren Wirksamkeit im Normalbereich ausbleibt. Das Normalelement verändert sich innerhalb des ganzen Verarbeitungsbereichs nur geringfügig (Figur 1). Das Positivelement verändert sich im Negativbereich sehr ähnlich wie das Normalelement, zeigt jedoch im Positivbereich eine eindeutige Tendenz zur Vergrösserung seiner Fläche (Figur 2). Das Negativelement verändert sich im Positivbereich ebenfalls sehr ähnlich wie das Normalelement, zeigt aber im Negativbereich eine eindeutige Tendenz zur Verkleinerung seiner Fläche (Figur 3). Figur 4 zeigt das Tonwertverhalten der 3 Elemente zueinander innerhalb eines grossen Verarbeitungsbereichs.According to the invention, the control device is characterized by the creation of 3 surface elements, so-called raster points, which differ in their reaction to changed processing conditions. A surface element was constructed for each of the 3 processing areas; which takes advantage of the special circumstances of the area in question. This behavior can be achieved by incorporating latent reinforcements in the positive element and latent weak points in the negative element. These positions can be described as latent because their effectiveness is not in the normal range. The normal element changes only slightly within the entire processing range (FIG. 1). The positive element changes in the negative area very similarly to the normal element, but shows a clear tendency to enlarge its area in the positive area (FIG. 2). The negative element also changes very similarly to the normal element in the positive region, but shows a clear tendency in the negative region to reduce its area (FIG. 3). FIG. 4 shows the tonal value behavior of the 3 elements to one another within a large processing range.
Im Normalbereich besitzen alle 3 Elemente die gleiche Flache und weisen daher den selben Tonwert auf, wodurch sie visuell nicht voneinander zu unterscheiden sind (Figur.5 ). Werden nun entweder Positivelemente oder Negativelemente mit Normalelementen gemischt und erfolgt die Mischung in dieser Weise, dass die sich stärker verändernden Elemente innerhalb der sich schwach verändernden Elemente (Normalelement) die Form eines speziellen Zeichens, einer Figur, eines Buchstabens oder eines ganzen Textes einnehmen, so kann damit sehr einfach geprüft werden, in welchem Verarbeitungsbereich die betreffende Textspalte pro- duziert wurde, bzw. ob eine Dichte- und Strichstärkenänderung stattgefunden hat.In the normal range, all 3 elements have the same area and therefore have the same tonal value, making them indistinguishable from each other visually (Figure 5). If either positive elements or negative elements are mixed with normal elements, the mixture is mixed in such a way that the more strongly changing elements within the weakly changing elements (normal element) take the form of a special character, a figure, a letter or an entire text can thus be easily checked in which processing area the text column in question was pro- uziert d, or whether a density and line thickness change has occurred.
In Figur 6 wurde ein Kontrollfeld realisiert, welches die Begriffe +++UEBERBELICHTET+++ und ---UNTERBELICHTET--- erkennen lässt, je nachdem ob die Textspalte mit zu hoher oder mit zu geringer Intensität belichtet wurde. Entspricht die Belichtung hingegen den üblichen und vom Fotosatzhersteller als richtig bezeichneten Werten, so erscheint das Kontrollfeld als neutral graue Fläche.A control field was realized in FIG. 6, which reveals the terms +++ OVER-EXPOSED +++ and --- UNDER-EXPOSURE ---, depending on whether the text column was exposed with too high or too low intensity. If, on the other hand, the exposure corresponds to the usual values that the photosetting manufacturer has designated as correct, the control field appears as a neutral gray area.
Claims (5)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7878101472T DE2862298D1 (en) | 1978-11-29 | 1978-11-29 | Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition |
| EP19780101472 EP0016234B1 (en) | 1978-11-29 | 1978-11-29 | Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19780101472 EP0016234B1 (en) | 1978-11-29 | 1978-11-29 | Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0016234A1 true EP0016234A1 (en) | 1980-10-01 |
| EP0016234B1 EP0016234B1 (en) | 1983-07-20 |
Family
ID=8185942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19780101472 Expired EP0016234B1 (en) | 1978-11-29 | 1978-11-29 | Method for visually testing the reproduction quality of printed matter obtained by cathode ray tube composition |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0016234B1 (en) |
| DE (1) | DE2862298D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715363A1 (en) * | 1987-05-08 | 1988-11-24 | Jens Rauch | Copier (copying device) which is equipped with a display unit which can be controlled by a computer and can be copied |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH554751A (en) * | 1973-03-08 | 1974-10-15 | Brunner Felix | DEVICE FOR CONTROLLING THE IMAGE QUALITY OF AN IMAGE TO BE PROCESSED IN A REPRODUCTION PROCESS. |
| US3998639A (en) * | 1974-11-19 | 1976-12-21 | Bell Telephone Laboratories, Incorporated | Methods for determining feature-size accuracy of circuit patterns |
| US4004923A (en) * | 1973-11-02 | 1977-01-25 | American Hoechst Corporation | Method of using a test film to measure developer activity |
| EP0000202A1 (en) * | 1977-06-30 | 1979-01-10 | Felix Brunner | Device for controlling the line width variation of characters produced by a photographic composing apparatus |
-
1978
- 1978-11-29 DE DE7878101472T patent/DE2862298D1/en not_active Expired
- 1978-11-29 EP EP19780101472 patent/EP0016234B1/en not_active Expired
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH554751A (en) * | 1973-03-08 | 1974-10-15 | Brunner Felix | DEVICE FOR CONTROLLING THE IMAGE QUALITY OF AN IMAGE TO BE PROCESSED IN A REPRODUCTION PROCESS. |
| US4004923A (en) * | 1973-11-02 | 1977-01-25 | American Hoechst Corporation | Method of using a test film to measure developer activity |
| US3998639A (en) * | 1974-11-19 | 1976-12-21 | Bell Telephone Laboratories, Incorporated | Methods for determining feature-size accuracy of circuit patterns |
| EP0000202A1 (en) * | 1977-06-30 | 1979-01-10 | Felix Brunner | Device for controlling the line width variation of characters produced by a photographic composing apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3715363A1 (en) * | 1987-05-08 | 1988-11-24 | Jens Rauch | Copier (copying device) which is equipped with a display unit which can be controlled by a computer and can be copied |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0016234B1 (en) | 1983-07-20 |
| DE2862298D1 (en) | 1983-08-25 |
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