EP0890141B1 - Electro-optical character generator - Google Patents
Electro-optical character generator Download PDFInfo
- Publication number
- EP0890141B1 EP0890141B1 EP97918057A EP97918057A EP0890141B1 EP 0890141 B1 EP0890141 B1 EP 0890141B1 EP 97918057 A EP97918057 A EP 97918057A EP 97918057 A EP97918057 A EP 97918057A EP 0890141 B1 EP0890141 B1 EP 0890141B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- character generator
- heat collector
- electro
- photoconductor
- 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.)
- Expired - Lifetime
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
- B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/377—Cooling or ventilating arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
- B41J2202/01—Embodiments of or processes related to ink-jet heads
- B41J2202/08—Embodiments of or processes related to ink-jet heads dealing with thermal variations, e.g. cooling
Definitions
- the invention relates to an electro-optical character generator for exposing the surface of a photoconductor, in particular a photoconductor in a high-performance printer, with a heat collector, on the support surface facing the photoconductor, a plurality of light-emitting elements arranged in a row for exposing the surface of the photoconductor, which are thermally conductive, are arranged are in connection with the heat collector, and in which a cavity extending in the direction of the line is formed, which is filled with a liquid, the quotient of the amount of heat supplied and the change in temperature per unit volume greater than or equal to 2.5 KJ / dm 3 K and with a cooling device connected to the heat collector for releasing the amount of heat absorbed by the heat collector into the environment.
- Electro-optical character generators are mainly used in copiers and printers used. They generate by exposure on the surface of a photoconductor the later Corresponding latent charge image with toner particles is colored. The colored charge image is then by means of a corona device on a drawing medium transferred and in a fixing device whose surface is fixed.
- Known character generators an extending in the longitudinal direction of the photoconductor, at the same time serving as a carrier heat collector, on the a support surface facing the photoconductor a plurality light-emitting elements in a row next to each other are arranged, as well as one attached to the heat collector optical device that by the light emitting Elements created light spots on the surface of the photoconductor sharp.
- the character generator with control electronics equipped by means of a variety of integrated Circuits (ICs) the individual light emitting elements controlled independently of each other in such a way that each of the amount of light emitted by the elements is adjustable, and various Charge states on the surface of the photoconductor and thus different shades of gray or color when later print image can be realized.
- ICs integrated Circuits
- LEDs Suitable as light-emitting elements, in particular in a pixel density of 600 dpi (dots per inch) and more, light emitting diodes, hereinafter referred to as LEDs, those in groups of, for example, 128 LEDs on a common one Chip, so-called LED arrays, in a line next to each other arranged attached.
- LED arrays those in groups of, for example, 128 LEDs on a common one Chip, so-called LED arrays, in a line next to each other arranged attached.
- the control electronics which may also be fixed with the carrier is connected.
- the light-emitting elements are thermally conductive connected to the heat collector, which of the Elements generated heat absorbs to the surface temperature of the elements below a critical temperature value from which, as explained above, a high quality Exposure of the photoconductor is no longer possible.
- a cooling device connected to the heat collector is the amount of heat stored by the heat collector given the environment.
- the actual heat capacity of the heat collector resulting from the weight-specific heat capacity of the material multiplied by the mass of the used Material results in such a way that of the light-emitting Adapting the amount of heat generated as a power loss to elements, that this can be dissipated quickly to heat accumulation and associated overheating of the light-emitting elements to prevent.
- heat collectors used that of a metal material with high weight specific Heat capacity, such as aluminum, copper or similar, exist. The amount of the actual heat capacity is determined by the mass that the heat collector used Has.
- EP-0 629 508 A2 describes a character generator mit.anderemittenden elements, on the underside Heat collector is attached. There is a U-shaped in the heat collector Channel trained with an external Cooling device is connected and with this one Cooling circuit forms through the water as a cooling liquid flows.
- the problem with this known character generator is that the heat collector be made of one material must, which is able to handle the amount of heat occurring to be able to store it long until it is free of the coolant be transported away.
- the actual heat capacity of the Heat collector results from the weight specific Heat capacity of the material multiplied by the mass of the material used. So that the heat collector a he must have a sufficiently high heat capacity be suitably heavy.
- this has the Disadvantage that the heat collectors due to its bend so heavily that a uniform sharp imaging of the light-emitting elements generated pixels on the Surface of the photoconductor is no longer possible. Further there is the problem that by the coolant water flowing through the channel the heat collector is cooled unevenly.
- a character generator is known from JP-A 63 168 372, on the top is a light-emitting element protective transparent cover is attached. At the Bottom of the character generator is a heat collector attached in which a channel system is formed. The of the cover with the top of the character generator The cavity formed is in the channel system Heat collector in connection. For cooling the light emitting elements flows through the cavity and the canal system consists of water and alcohol Coolant.
- the rigidity of the heat collector is determined by the hollow profile, while the level of the heat capacity of the heat collector depends on the liquid.
- the heat capacity of the heat collector is determined by the volume-specific heat capacity of the liquid, which is defined as the quotient of the heat quantity supplied in kJ and the temperature change in K relative to a unit volume in dm 3 , and the volume of the liquid used.
- the volume of the cavity filled with the liquid, which is enclosed by the thin-walled hollow profile can be minimized.
- suitable liquids such as glycerol, water or the like, whose volume-specific heat capacity is greater than or equal to 2.5 kJ / dm 3 K
- the greater the volume-specific heat capacity of the liquid the smaller the volume of the cavity can be, so that the construction volume of the heat collector decreases accordingly.
- the rigidity of the heat collector is largely dependent on the hollow profile, so that the deflection of the heat collector can be minimized by optimizing the cross-sectional shape and suitable material selection, as a result of which imaging errors due to the deflection of the heat collector are reduced and the character generator works with high image quality.
- the hollow profile preferably has a cross-sectional shape whose Area moment of inertia is so large that the Can only bend the support surface as far as that of the light emitting elements generated light spots still on the surface of the photoconductor, i.e. evenly over its entire Length are shown.
- the hollow profile is designed as a U-profile, which is a base, on its upper side facing the photoconductor, the support surface is formed, and two approximately perpendicular to the Top of the base facing away from the base, at least has legs of approximately the same length.
- the thighs are connected to each other via a base plate, so that the U-profile is closed and which is in the direction of the line extending cavity is formed.
- the cavity is on its two open ends each have an end plate closed.
- the top of the base is on the top of the base approximately in the middle extending towards the row, from the base Raised heel is formed, which forms the support surface.
- the top of the base has enough space for the control electronics free, which makes a particularly compact structure of the Character generator is possible.
- the U-profile can be made by pulling or extrusion be, the base plate in one piece with the legs of the U-profile is formed.
- the base plate in another form of training is the base plate by joining, i.e. through manufacturing processes such as welding, soldering or gluing, liquid-tight connected to the legs of the U-profile.
- Metal materials are suitable for non-ferrous metals, such as aluminum, Copper or the like, and their alloys. It can but also conventional structural steels or alloyed steels for that Hollow profile of the heat collector can be used.
- a liquid for the heat collector As a liquid for the heat collector, a liquid is proposed whose quotient is in a range from 3.0 to 5 kJ / dm 3 K, preferably in a range from 3.5 to 4.5 kJ / dm 3 K, since these liquids have a low density compared to their volume-specific heat capacity, and the weight of the liquid, through which the heat collector additionally bends, is low.
- Glycerol with a volume-specific heat capacity of approximately 3.0 kJ / dm 3 K or water with a volume-specific heat capacity of approximately 4.2 kJ / dm 3 K are proposed as liquids, since the density of this liquid is similar compared to the density of suitable metal materials high volume-specific heat capacities is low.
- cooling grille As a cooling device a cooling grille is proposed, one on the hollow profile has thermally conductively attached support plate, of which the Panel side facing away from the hollow profile, several in parallel The cooling fins are spaced vertically.
- FIG. 1 shows a perspective view of a section one used in a high performance printer Character generator 10.
- the character generator 10 has a as Carrier-serving heat collector 12, which is transverse to the direction of movement a rotating photoconductor drum 14 (shown in broken lines) of the printer.
- the copper heat collector 12 formed as a U-profile 16.
- the U-profile has 16 a base 18 on which the photoconductor drum 14, (not shown), facing top approximately in the middle Longitudinal direction of the U-profile 16 extending from the base 18 raised paragraph 20 is formed. That of the photoconductor drum 14 facing top of paragraph 20 is precision machined and serves as a support surface 22 for light emitting Elements as explained later.
- the longitudinal edges of the Base 18 are bent over in such a way that two of approximately the same length, extending in the longitudinal direction of the U-profile 16 legs 24 and 26 are formed, which are approximately perpendicular to the Bottom of the base 18 facing away from the photoconductor drum 14 protrude.
- the free end of each leg 24 and 26 is bent at right angles to the outside in such a way that at each Legs 24 and 26 are in the longitudinal direction of the U-profile 16 extending, approximately parallel to the top of the base 18th extending fastening edge 28 or 30 is formed.
- each facing away from the photoconductor drum 14 Fastening edge 28 and 30 is machined flat and serves as Contact surface for one of the two legs 24 and 26 with each other connecting, over the entire length of the U-section 16 extending base plate 32.
- the base plate 32 is liquid-tight with the fastening edges 28 and 30 of the U-profile 16 brazed so that one is in the longitudinal direction of the heat collector 12 extending cavity 34 is formed, the its two open ends each have an end plate (not shown) is closed.
- This cavity 34 is as shown in Figure 1, filled with water 36, which as Heat storage serves, as will be explained later.
- each LED array 38 in this embodiment 128 light-emitting diodes (LEDs) carries that side by side are arranged in a row.
- the LED arrays 38 are also arranged side by side so that their LEDs an extending in the longitudinal direction of the heat collector 12 LED line 40 form that for exposing the surface the photoconductor drum 14 is used.
- Above the LED line 40 is also one of the emission areas of the LEDs on the Optical imaging surface of the photoconductor drum 14 Device arranged, but for reasons of clarity is not shown.
- IC integrated circuits
- On both sides of paragraph 20 is in each case an L-shaped cross section, extending in the longitudinal direction of the heat collector 12 extending busbar 46 or 48, which are arranged over an insulation layer 50 or 52 is firmly connected to the top of the U-profile 16.
- each bus bar carries 46 and 48, a printed circuit board 54 connected to them or 56, on each of which conductor tracks (not shown) are formed, which with the individual ICs of the IC series 42nd or 44 are connected via bond connections.
- a cooling grid 58 On the bottom of the heat collector 12 is also a cooling grid 58 attached.
- the cooling grid 58 has one over the entire Width of the base plate 32 extending over the entire Length of the heat collector 12 extending support plate 60, the is thermally connected to the base plate 32 and of whose plate side facing away from the base plate 32 several in Longitudinal direction of the heat collector 12 running, parallel spaced-apart cooling fins 62 perpendicular protrude.
- the printer Activate as soon as the printer starts printing the individual ICs of the IC series 42 and 44 the different ones LEDs of the LED arrays 38, creating the surface of the photoconductor drum 14 is exposed.
- the ICs vary from those of the LEDs emitted amount of light, so that different charge states on the surface of the photoconductor drum 14 and thus different Gray or color tones in the later print image can be realized.
- By constantly switching on and off the LEDs of the LED arrays 38 generate heat which is about the heat collector 12 must be removed.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Abstract
Description
Die Erfindung betrifft einen elektrooptischen Zeichengenerator zum Belichten der Oberfläche eines Fotoleiters, insbesondere eines Fotoleiters in einem Hochleistungsdrucker, mit einem Wärmekollektor, auf dessen dem Fotoleiter zugewandten Trägerfläche eine Vielzahl, in einer Zeile angeordnete lichtemittierende Elemente zum Belichten der Oberfläche des Fotoleiters angeordnet sind, die wärmeleitend mit dem Wärmekollektor in Verbindung stehen, and in dem ein in Richtung der Zeile verlaufender Hohlraum ausgebildet ist, der mit einer Flüssigkeit gefüllt ist, deren Quotient aus zugeführter Wärmemenge und Temperatur änderung pro Volumeneinheit größer oder gleich 2,5 KJ/dm3 K und mit einer mit dem Wärmekollektor verbundenen Kühlvorrichtung zur Abgabe der vom Wärmekollektor aufgenommenen Wärmemenge an die Umgebung.The invention relates to an electro-optical character generator for exposing the surface of a photoconductor, in particular a photoconductor in a high-performance printer, with a heat collector, on the support surface facing the photoconductor, a plurality of light-emitting elements arranged in a row for exposing the surface of the photoconductor, which are thermally conductive, are arranged are in connection with the heat collector, and in which a cavity extending in the direction of the line is formed, which is filled with a liquid, the quotient of the amount of heat supplied and the change in temperature per unit volume greater than or equal to 2.5 KJ / dm 3 K and with a cooling device connected to the heat collector for releasing the amount of heat absorbed by the heat collector into the environment.
Elektrooptische Zeichengeneratoren werden vor allem in Kopiergeräten und Druckern verwendet. Sie erzeugen durch Belichten auf der Oberfläche eines Fotoleiters ein dem späteren Druckbild entsprechendes latentes Ladungsbild, das mit Tonerpartikeln eingefärbt wird. Das eingefärbte Ladungsbild wird anschließend mittels einer Koronaeinrichtung auf einen Zeichnungsträger übertragen und in einer Fixiereinrichtung auf dessen Oberfläche fixiert. Bekannte Zeichengeneratoren haben einen sich in Längsrichtung des Fotoleiters erstreckenden, gleichzeitig als Träger dienenden Wärmekollektor, auf dessen einer, dem Fotoleiter zugewandten Trägerfläche eine Vielzahl lichtemittierender Elemente in einer Zeile nebeneinander angeordnet sind, sowie eine am Wärmekollektor befestigte optische Einrichtung, die die von den lichtemittierenden Elementen erzeugten Lichtpunkte auf der Oberfläche des Fotoleiters scharf abbildet.Electro-optical character generators are mainly used in copiers and printers used. They generate by exposure on the surface of a photoconductor the later Corresponding latent charge image with toner particles is colored. The colored charge image is then by means of a corona device on a drawing medium transferred and in a fixing device whose surface is fixed. Known character generators an extending in the longitudinal direction of the photoconductor, at the same time serving as a carrier heat collector, on the a support surface facing the photoconductor a plurality light-emitting elements in a row next to each other are arranged, as well as one attached to the heat collector optical device that by the light emitting Elements created light spots on the surface of the photoconductor sharp.
Ferner ist der Zeichengenerator mit einer Ansteuerelektronik ausgestattet, die mittels einer Vielzahl von Integrierten Schaltungen (ICs) die einzelnen lichtemittierenden Elemente unabhängig voneinander derart ansteuert, daß die jeweils von den Elementen abgegebene Lichtmenge einstellbar ist, und verschiedene Ladungszustände auf der Oberfläche des Fotoleiters und damit unterschiedliche Grau- bzw. Farbabstufungen beim späteren Druckbild realisiert werden können.Furthermore, the character generator with control electronics equipped by means of a variety of integrated Circuits (ICs) the individual light emitting elements controlled independently of each other in such a way that each of the amount of light emitted by the elements is adjustable, and various Charge states on the surface of the photoconductor and thus different shades of gray or color when later print image can be realized.
Als lichtemittierende Elemente eignen sich, insbesondere bei einer Bildpunktdichte von 600 dpi (dots per inch) und mehr, lichtemittierende Dioden, nachfolgend als LEDs bezeichnet, die in Gruppen von beispielsweise 128 LEDs auf einem gemeinsamen Chip, sogenannten LED-Arrays, in einer Linie nebeneinander angeordnet befestigt sind. Abhängig von der Breite des Fotoleiters werden mehrere solche LED-Arrays nebeneinander auf der in Längsrichtung des Fotoleiters verlaufenden Trägerfläche des Wärmekollektors befestigt und über die Ansteuerungselektronik, die gegebenenfalls auch mit dem Träger fest verbunden ist, angesteuert.Suitable as light-emitting elements, in particular in a pixel density of 600 dpi (dots per inch) and more, light emitting diodes, hereinafter referred to as LEDs, those in groups of, for example, 128 LEDs on a common one Chip, so-called LED arrays, in a line next to each other arranged attached. Depending on the width of the Several such LED arrays are placed side by side on the support surface running in the longitudinal direction of the photoconductor attached to the heat collector and via the control electronics, which may also be fixed with the carrier is connected.
Bei diesen LED-Arrays können Verlustleistungen von bis zu 6 W pro LED-Array auftreten, so daß bei einem Hochleistungsdrucker, der beispielsweise eine Druckbreite von 30 Zoll hat und zum Belichten der Oberfläche des Fotoleiters etwa 140 solche LED-Arrays verwendet, Verlustleistungen von annähernd 850 W entstehen. Die auf diese Weise entstehende Wärmemenge muß abgeführt werden, da die Oberflächentemperatur jedes LEDs bei Betrieb 50° C nicht übersteigen darf. Ist nämlich die Oberflächentemperatur des LEDs höher, nimmt die von den LEDs erzeugte Lichtmenge ab, so daß die Oberfläche des Fotoleiters nicht mehr mit gleichbleibend hoher Qualität durch die LEDs belichtet werden kann.With these LED arrays, power losses of up to 6 W can be achieved occur per LED array, so with a high-performance printer, which has a print width of 30 inches, for example and about 140 to expose the surface of the photoconductor such LED arrays used, power dissipation of approximately 850 W arise. The amount of heat generated in this way must be dissipated because the surface temperature of each LED must not exceed 50 ° C during operation. Because it is Surface temperature of the LEDs is higher, that of the LEDs generated amount of light, so that the surface of the photoconductor no longer with consistently high quality through the LEDs can be exposed.
Aus diesem Grund sind die lichtemittierenden Elemente wärmeleitend mit dem Wärmekollektor verbunden, der die von den Elementen erzeugte Wärmemenge aufnimmt, um die Oberflächentemperatur der Elemente unter einem kritischen Temperaturwert zu halten, ab dem, wie oben erläutert, eine qualitativ hochwertige Belichtung des Fotoleiters nicht mehr möglich ist. Mittels einer mit dem Wärmekollektor verbundenen Kühleinrichtung wird die vom Wärmekollektor gespeicherte Wärmemenge an die Umgebung abgegeben.For this reason, the light-emitting elements are thermally conductive connected to the heat collector, which of the Elements generated heat absorbs to the surface temperature of the elements below a critical temperature value from which, as explained above, a high quality Exposure of the photoconductor is no longer possible. By means of a cooling device connected to the heat collector is the amount of heat stored by the heat collector given the environment.
Es ist bekannt, die tatsächliche Wärmekapazität des Wärmekollektors, die sich aus der gewichtspezifischen Wärmekapazität des Materials multipliziert mit der Masse des eingesetzten Materials ergibt, derart an die von den lichtemittierenden Elementen als Verlustleistung erzeugte Wärmemenge anzupassen, daß diese schnell abgeführt werden kann, um Wärmestaus und damit verbundene Überhitzungen der lichtemittierenden Elemente zu verhindern. Zu diesem Zweck werden Wärmekollektoren verwendet, die aus einem Metallmaterial mit hoher gewichtsspezifischer Wärmekapazität, wie Aluminium, Kupfer oder ähnlichem, bestehen. Die Höhe der tatsächlichen Wärmekapazität wird durch die Masse bestimmt, die der verwendete Wärmekollektor hat.It is known the actual heat capacity of the heat collector, resulting from the weight-specific heat capacity of the material multiplied by the mass of the used Material results in such a way that of the light-emitting Adapting the amount of heat generated as a power loss to elements, that this can be dissipated quickly to heat accumulation and associated overheating of the light-emitting elements to prevent. For this purpose, heat collectors used that of a metal material with high weight specific Heat capacity, such as aluminum, copper or similar, exist. The amount of the actual heat capacity is determined by the mass that the heat collector used Has.
Als Wärmekollektoren werden gezogene oder stranggepreßte Vollprofile aus den entsprechend geeigneten Metallmaterialien eingesetzt, die die erforderliche Masse und damit Wärmekapazität besitzen, um die auftretenden Wärmemengen speichern zu können. Diese Wärmekollektoren haben jedoch den Nachteil, daß sie sich, trotz des hohen Widerstandsmomentes des Vollprofils, aufgrund ihres hohen Eigengewichtes so stark durchbiegen, daß ein gleichmäßiges scharfes Abbilden der von den lichtemittierenden Elementen erzeugten Bildpunkte auf der Oberfläche des Fotoleiters durch die optische Einrichtung nicht mehr möglich ist. Dieses Problem tritt insbesondere bei Hochleistungsdruckern und Kopierern mit breiten Fotoleitern auf. So beträgt die Durchbiegung des Trägers eines Hochleistungsdruckers, der zwei Papierbahnen mit DIN-A4-Format oder Letter-Size-Format gleichzeitig bedrucken kann, etwa 40 bis 50 µm. Die optische Einrichtung erzeugt dadurch beim Abbilden des Bildpunktes, dessen Durchmesser etwa 60 µm beträgt, einen Abbildungsfehler von 3 bis 5 Am, so daß ein Scharfeinstellen der Bildpunkte über die gesamte Breite der Oberfläche des Fotoleiters unmöglich wird. Drawn or extruded are used as heat collectors Full profiles made of the appropriate metal materials used the required mass and thus heat capacity own in order to save the heat that occurs can. However, these heat collectors have the disadvantage that despite the high section modulus of the full profile, bend so much due to its high weight, that uniform sharp imaging of those of the light-emitting elements generated pixels on the Surface of the photoconductor through the optical device is no longer possible. This problem occurs in particular High performance printers and copiers with wide photoconductors on. So the deflection of the carrier of a high-performance printer is of the two paper webs with A4 format or Letter-size format can print at the same time, about 40 to 50 µm. The optical device thereby generates when imaging of the pixel, the diameter of which is approximately 60 µm, one Aberration of 3 to 5 Am, so that focus the pixels over the entire width of the surface of the Photoconductor becomes impossible.
Um die Kühlleistung des Wärmekollektors weiter zu erhöhen, ist es ferner bekannt im Wärmekollektor Kühlkanäle auszubilden, durch die eine die Wärme abführende Flüssigkeit strömt.To further increase the cooling capacity of the heat collector, it is also known in the heat collector cooling channels train through which one dissipates the heat Liquid flows.
So beschreibt die EP-0 629 508 A2 einen Zeichengenerator mit.lichtemittierenden Elementen, an dessen Unterseite ein Wärmekollektor befestigt ist. Im Wärmekollektor ist ein Uförmiger Kanal ausgebildet, der mit einer externen Kühlvorrichtung in Verbindung steht und mit dieser einen Kühlkreislauf bildet, durch den Wasser als Kühlflüssigkeit strömt.For example, EP-0 629 508 A2 describes a character generator mit.lichtemittenden elements, on the underside Heat collector is attached. There is a U-shaped in the heat collector Channel trained with an external Cooling device is connected and with this one Cooling circuit forms through the water as a cooling liquid flows.
Bei diesem bekannten Zeichengenerator besteht das Problem, daß der Wärmekollektor aus einem Material gefertigt sein muß, das in der Lage ist, die auftretenden Wärmemengen so lange speichern zu können, bis sie von der Kühlflüssigkeit abtransportiert werden. Die tatsächliche Wärmekapazität des Wärmekollektors ergibt sich aus der gewichtsspezifischen Wärmekapazität des Materials multipliziert mit der Masse des eingesetzten Materials. Damit der Wärmekollektor eine ausreichend hohe Wärmekapazität besitzen, muß er entsprechend schwer ausgebildet sein. Dies hat jedoch den Nachteil, daß sich die Wärmekollektoren aufgrund seines hohen Eigengewichtes so stark durchbiegen, daß ein gleichmäßiges scharfes Abbilden der von den lichtemittierenden Elementen erzeugten Bildpunkte auf der Oberfläche des Fotoleiters nicht mehr möglich ist. Ferner besteht das Problem, daß durch das als Kühlflüssigkeit durch den Kanal strömende Wasser der Wärmekollektor ungleichmäßig abgekühlt wird. Die nahe der Eintrittsöffnung des Kanals angeordneten lichtemittierenden Elemente werden durch das einströmende kalte Wasser stärker abgekühlt als die am anderen Ende des Wärmekollektors vorgesehenen lichtemittierenden Elemente. Dadurch kommt es zu einer ungleichmäßigen Temperaturverteilung über die Länge des Wärmekollektors, durch die die Druckqualität des Zeichengenerators gemindert wird.The problem with this known character generator is that that the heat collector be made of one material must, which is able to handle the amount of heat occurring to be able to store it long until it is free of the coolant be transported away. The actual heat capacity of the Heat collector results from the weight specific Heat capacity of the material multiplied by the mass of the material used. So that the heat collector a he must have a sufficiently high heat capacity be suitably heavy. However, this has the Disadvantage that the heat collectors due to its bend so heavily that a uniform sharp imaging of the light-emitting elements generated pixels on the Surface of the photoconductor is no longer possible. Further there is the problem that by the coolant water flowing through the channel the heat collector is cooled unevenly. The near the entrance opening of the channel arranged light-emitting elements cooled by the incoming cold water more than those provided at the other end of the heat collector light emitting elements. This leads to a uneven temperature distribution over the length of the Heat collector, through which the print quality of the Character generator is reduced.
Aus der JP-A 63 168 372 ist ein Zeichengenerator bekannt, auf dessen Oberseite eine die lichtemittierenden Elemente schützende transparente Abdeckung befestigt ist. An der Unterseite des Zeichengenerators ist ein Wärmekollektor befestigt, in dem ein Kanalsystem ausgebildet ist. Der von der Abdeckung mit der Oberseite des Zeichengenerators gebildete Hohlraum steht mit dem Kanalsystem im Wärmekollektor in Verbindung. Zum Kühlen der lichtemittierenden Elemente strömt durch den Hohlraum und das Kanalsystem eine aus Wasser und Alkohol bestehende Kühlflüssigkeit.A character generator is known from JP-A 63 168 372, on the top is a light-emitting element protective transparent cover is attached. At the Bottom of the character generator is a heat collector attached in which a channel system is formed. The of the cover with the top of the character generator The cavity formed is in the channel system Heat collector in connection. For cooling the light emitting elements flows through the cavity and the canal system consists of water and alcohol Coolant.
Es ist Aufgabe der Erfindung, einen einfach aufgebauten Zeichengenerator bereitzustellen, der bei geringer Durchbiegung eine gleichmäßige Wärmeverteilung über die gesamte Länge des Zeichengenerators sicherstellt.It is an object of the invention to have a simple structure Provide character generator at low Deflection even heat distribution over the ensures the entire length of the character generator.
Diese Aufgabe wird für einen elektrooptischen Zeichengenerator der eingangs genannten Art dadurch gelöst, daß der Hohlraum im Wärmekollektor durch ein in Richtung der Zeile verlaufendes, geschlossenes dünnwandiges Hohlprofil gebildet ist, das an seinen beiden Enden geschlossen ist. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen. This task is for an electro-optical Character generator of the type mentioned in the introduction solved that the cavity in the heat collector through a towards closed, thin-walled line Hollow profile is formed at both ends closed is. There are advantageous further developments from the subclaims.
Bei der Erfindung wird die Steifigkeit des Wärmekollektors durch das Hohlprofil bestimmt, während die Höhe der Wärmekapazität des Wärmekollektors von der Flüssigkeit abhängt. Die Wärmekapazität des Wärmekollektors wird durch die volumenspezifische Wärmekapazität der Flüssigkeit, die als Quotient aus zugeführter Wärmemenge in kJ und Temperaturänderung in K bezogen auf eine Volumeneinheit in dm3 definiert ist, und das eingesetzte Volumen der Flüssigkeit festgelegt.In the invention, the rigidity of the heat collector is determined by the hollow profile, while the level of the heat capacity of the heat collector depends on the liquid. The heat capacity of the heat collector is determined by the volume-specific heat capacity of the liquid, which is defined as the quotient of the heat quantity supplied in kJ and the temperature change in K relative to a unit volume in dm 3 , and the volume of the liquid used.
Durch Auswahl geeigneter Flüssigkeiten, wie Glycerin, Wasser oder ähnlichem, deren volumenspezifische Wärmekapazität größer oder gleich 2,5 kJ/dm3K ist, kann das Volumen des mit der Flüssigkeit gefüllten Hohlraums, der von dem dünnwandigen Hohlprofil umschlossen ist, minimiert werden. Je größer die volumenspezifische Wärmekapazität der Flüssigkeit ist, desto geringer kann das Volumen des Hohlraumes ausgebildet werden, so daß das Bauvolumen des Wärmekollektors entsprechend abnimmt. Die Steifigkeit des Wärmekollektors ist maßgeblich vom Hohlprofil abhängig, so daß durch Optimieren der Querschnittsform und geeignete Materialauswahl die Durchbiegung des Wärmekollektors minimierbar ist, wodurch Abbildungsfehler aufgrund der Durchbiegung des Wärmekollektors verringert sind und der Zeichengenerator mit hoher Abbildungsqualität arbeitet.By selecting suitable liquids, such as glycerol, water or the like, whose volume-specific heat capacity is greater than or equal to 2.5 kJ / dm 3 K, the volume of the cavity filled with the liquid, which is enclosed by the thin-walled hollow profile, can be minimized. The greater the volume-specific heat capacity of the liquid, the smaller the volume of the cavity can be, so that the construction volume of the heat collector decreases accordingly. The rigidity of the heat collector is largely dependent on the hollow profile, so that the deflection of the heat collector can be minimized by optimizing the cross-sectional shape and suitable material selection, as a result of which imaging errors due to the deflection of the heat collector are reduced and the character generator works with high image quality.
Vorzugsweise hat das Hohlprofil eine Querschnittsform, deren Flächenträgheitsmoment so groß ist, daß sich die Trägerfläche nur soweit durch biegen kann, daß die von den lichtemittierenden Elementen erzeugten Lichtpunkte noch schauf auf der Oberfläche des Fotoleiters, d.h. gleichmäßig über dessen gesamte Länge abgebildet sind.The hollow profile preferably has a cross-sectional shape whose Area moment of inertia is so large that the Can only bend the support surface as far as that of the light emitting elements generated light spots still on the surface of the photoconductor, i.e. evenly over its entire Length are shown.
In einer bevorzugten Ausführungsform des Zeichengenerators ist das Hohlprofil als U-Profil ausgebildet, das eine Basis, auf deren dem Fotoleiter zugewandten Oberseite die Trägerfläche ausgebildet ist, und zwei etwa senkrecht von der der Oberseite abgewandten Unterseite der Basis abstehende, zumindest annähernd gleich lange Schenkel hat. Die Schenkel sind über eine Grundplatte miteinander verbunden, so daß das U-Profil geschlossen ist und der sich in Richtung der Zeile erstreckende Hohlraum ausgebildet wird. Der Hohlraum ist an seinen beiden offenen Enden jeweils über eine Abschlußplatte geschlossen. Durch Ausbildung des Hohlprofils als U-Profil besitzt der Wärmekollektor ein hohes Flächenträgheitsmoment, durch das die Durchbiegung des elektrooptischen Zeichengenerators minimiert ist.In a preferred embodiment of the character generator the hollow profile is designed as a U-profile, which is a base, on its upper side facing the photoconductor, the support surface is formed, and two approximately perpendicular to the Top of the base facing away from the base, at least has legs of approximately the same length. The thighs are connected to each other via a base plate, so that the U-profile is closed and which is in the direction of the line extending cavity is formed. The cavity is on its two open ends each have an end plate closed. By forming the hollow profile as a U-profile the heat collector has a high moment of inertia, through which the deflection of the electro-optical character generator is minimized.
Vorzugsweise ist auf der Oberseite der Basis etwa mittig ein sich in Richtung der Zeile erstreckender, von der Basis erhabener Absatz ausgeformt, der die Trägerfläche bildet. Auf diese Weise bleibt zu beiden Seiten des Absatzes auf der Oberseite der Basis entsprechend Platz für die Ansteuerelektronik frei, wodurch ein besonders kompakter Aufbau des Zeichengenerators möglich ist.Preferably, is on the top of the base approximately in the middle extending towards the row, from the base Raised heel is formed, which forms the support surface. On this way stays on both sides of the paragraph The top of the base has enough space for the control electronics free, which makes a particularly compact structure of the Character generator is possible.
Das U-Profil kann durch Ziehen oder Strangpressen gefertigt werden, wobei die Grundplatte einstückig mit den Schenkeln des U-Profils ausgebildet wird. In einer weiteren Ausbildungsform wird die Grundplatte durch Fügen, d.h. durch Fertigungsverfahren wie Schweißen, Löten oder Kleben, flüssigkeitsdicht mit den Schenkeln des U-Profils verbunden. Als Metallmaterial eignen sich Nichteisenmetalle, wie Aluminium, Kupfer oder ähnliches, sowie deren Legierungen. Es können aber auch herkömmliche Baustähle oder legierte Stähle für das Hohlprofil des Wärmekollektors verwendet werden.The U-profile can be made by pulling or extrusion be, the base plate in one piece with the legs of the U-profile is formed. In another form of training is the base plate by joining, i.e. through manufacturing processes such as welding, soldering or gluing, liquid-tight connected to the legs of the U-profile. As Metal materials are suitable for non-ferrous metals, such as aluminum, Copper or the like, and their alloys. It can but also conventional structural steels or alloyed steels for that Hollow profile of the heat collector can be used.
Als Flüssigkeit für den Wärmekollektor wird eine Flüssigkeit vorgeschlagen, deren genannter Quotient in einem Bereich von 3,0 bis 5 kJ/dm3K, vorzugsweise in einem Bereich von 3,5 bis 4,5 kJ/dm3K liegt, da diese Flüssigkeiten verglichen mit ihrer volumenspezifischen Wärmekapazität eine geringe Dichte besitzen, und das Eigengewicht der Flüssigkeit, durch das sich der Wärmekollektor zusätzlich durchbiegt, gering ist. Als Flüssigkeiten werden Glycerin mit einer volumenspezifischen Wärmekapazität von etwa 3,0 kJ/dm3K oder Wasser mit einer volumenspezifischen Wärmekapazität von etwa 4,2 kJ/dm3K vorgeschlagen, da die Dichte dieser Flüssigkeit, verglichen mit der Dichte geeigneter Metallmaterialien mit ähnlich hohen volumenspezifischen Wärmekapazitäten jedoch gering ist.As a liquid for the heat collector, a liquid is proposed whose quotient is in a range from 3.0 to 5 kJ / dm 3 K, preferably in a range from 3.5 to 4.5 kJ / dm 3 K, since these liquids have a low density compared to their volume-specific heat capacity, and the weight of the liquid, through which the heat collector additionally bends, is low. Glycerol with a volume-specific heat capacity of approximately 3.0 kJ / dm 3 K or water with a volume-specific heat capacity of approximately 4.2 kJ / dm 3 K are proposed as liquids, since the density of this liquid is similar compared to the density of suitable metal materials high volume-specific heat capacities is low.
Als Kühleinrichtung wird ein Kühlgitter vorgeschlagen, das eine am Hohlprofil wärmeleitend befestigte Trägerplatte hat, von deren dem Hohlprofil abgewandten Plattenseite mehrere, parallel mit Abstand zueinander angeordnete Kühlrippen senkrecht abstehen. As a cooling device a cooling grille is proposed, one on the hollow profile has thermally conductively attached support plate, of which the Panel side facing away from the hollow profile, several in parallel The cooling fins are spaced vertically.
Nachfolgend wird die Erfindung anhand der Zeichnung näher erläutert. Darin zeigen:
- Fig. 1
- eine perspektivische Darstellung eines Abschnittes eines Zeichengenerators, und
- Fig. 2
- eine geschnittene Vorderansicht eines im Zeichengenerator nach Figur 1 verwendeten Wärmekollektors.
- Fig. 1
- a perspective view of a portion of a character generator, and
- Fig. 2
- a sectional front view of a heat collector used in the character generator of Figure 1.
Figur 1 zeigt eine perspektivische Darstellung eines Abschnittes
eines in einem Hochleistungsdrucker verwendeten
Zeichengenerators 10. Der Zeichengenerator 10 hat einen als
Träger dienenden Wärmekollektor 12, der sich quer zur Bewegungsrichtung
einer sich drehenden Fotoleitertrommel 14
(gestrichelt dargestellt) des Druckers erstreckt. Wie in
Figur 2 dargestellt, ist der aus Kupfer bestehende Wärmekollektor
12 als U-Profil 16 ausgebildet. Das U-Profil 16 hat
eine Basis 18, auf deren der Fotoleitertrommel 14, (nicht
dargestellt), zugewandten Oberseite etwa mittig ein sich in
Längsrichtung des U-Profils 16 erstreckender, von der Basis
18 erhabener Absatz 20 ausgeformt ist. Die der Fotoleitertrommel
14 zugewandte Oberseite des Absatzes 20 ist feinstbearbeitet
und dient als Trägerfläche 22 für lichtemittierende
Elemente, wie später erläutert wird. Die Längskanten der
Basis 18 sind derart umgebogen, daß zwei etwa gleich lange,
sich in Längsrichtung des U-Profils 16 erstreckende Schenkel
24 und 26 ausgeformt sind, die etwa senkrecht von der der
Fotoleitertrommel 14 abgewandten Unterseite der Basis 18
abstehen. Das jeweils freie Ende jedes Schenkels 24 und 26
ist rechtwinklig nach außen derart umgebogen, daß an jedem
Schenkel 24 und 26 eine sich in Längsrichtung des U-Profils
16 erstreckende, in etwa parallel zur Oberseite der Basis 18
verlaufende Befestigungskante 28 bzw. 30 ausgebildet ist. Die
der Fotoleitertrommel 14 abgewandte untere Fläche jeder
Befestigungskante 28 und 30 ist plan bearbeitet und dient als
Anlagefläche für eine die beiden Schenkel 24 und 26 miteinander
verbindende, sich über die gesamte Länge des U-Profils 16
erstreckende Grundplatte 32. Die Grundplatte 32 ist flüssigkeitsdicht
mit den Befestigungskanten 28 und 30 des U-Profils
16 hart verlötet, so daß ein sich in Längsrichtung des Wärmekollektors
12 erstreckender Hohlraum 34 gebildet ist, der an
seinen beiden offenen Enden jeweils über eine Abschlußplatte
(nicht dargestellt) verschlossen ist. Dieser Hohlraum 34 ist,
wie in Figur 1 dargestellt, mit Wasser 36 gefüllt, das als
Wärmespeicher dient, wie später noch erläutert wird.Figure 1 shows a perspective view of a section
one used in a high performance printer
Character generator 10. The character generator 10 has a as
Carrier-serving
Wie in Figur 1 gezeigt, sind in der Mitte der Trägerfläche 22
mehrere LED-Arrays 38 wärmeleitend mit dem Wärmekollektor 12
verbunden, wobei jeder LED-Array 38 in dieser Ausführungsform
128 lichtemittierende Dioden (LEDs) trägt, die nebeneinanderliegend
in einer Zeile angeordnet sind. Die LED-Arrays 38
sind gleichfalls nebeneinanderliegend angeordnet, so daß ihre
LEDs eine sich in Längsrichtung des Wärmekollektors 12 erstreckende
LED-Zeile 40 bilden, die zum Belichten der Oberfläche
der Fotoleitertrommel 14 dient. Oberhalb der LED-Zeile
40 ist ferner eine die Emissionsflächen der LEDs auf der
Oberfläche der Fotoleitertrommel 14 abbildende optische
Einrichtung angeordnet, die jedoch aus Übersichtlichkeitsgründen
nicht dargestellt ist.As shown in FIG. 1, there are 22 in the middle of the support surface
a plurality of LED arrays 38 are heat-conducting with the
Auf jeder Seite der LED-Zeile 40 ist jeweils eine sich in
Längsrichtung des Wärmekollektors 12 erstreckende IC-Reihe 42
bzw. 44, bestehend aus mehreren ICs (IC = integrierte Schaltungen),
angeordnet, die jeweils elektrisch leitend mit dem
Wärmekollektor 12 fest verbunden sind und die einzelnen LEDs
der LED-Zeile 40 ansteuern. Zu beiden Seiten des Absatzes 20
ist jeweils eine im Querschnitt L-förmige, sich in Längsrichtung
des Wärmekollektors 12 erstreckende Stromschiene 46 bzw.
48 angeordnet, die über eine Isolationsschicht 50 bzw. 52
fest mit der Oberseite des U-Profils 16 verbunden ist. Etwa
auf Höhe der IC-Reihen 42 und 44 trägt jede Stromschiene 46
und 48 eine leitend mit diesen verbundene Flachbaugruppe 54
bzw. 56, auf denen jeweils Leiterbahnen (nicht dargestellt)
ausgebildet sind, die mit den einzelnen ICs der IC-Reihen 42
bzw. 44 über Bond-Verbindungen verbunden sind. Auf der Unterseite
des Wärmekollektors 12 ist ferner ein Kühlgitter 58
befestigt. Das Kühlgitter 58 hat eine sich über die gesamte
Breite der Grundplatte 32 erstreckende, über die gesamte
Länge des Wärmekollektors 12 verlaufende Trägerplatte 60, die
wärmeleitend mit der Grundplatte 32 verbunden ist und von
deren der Grundplatte 32 abgewandten Plattenseite mehrere in
Längsrichtung des Wärmekollektors 12 verlaufende, parallel
mit Abstand zueinander angeordnete Kühlrippen 62 senkrecht
abstehen.There is one on each side of the
Sobald der Drucker mit dem Druckbetrieb beginnt, aktivieren
die einzelnen ICs der IC-Reihen 42 und 44 die verschiedenen
LEDs der LED-Arrays 38, wodurch die Oberfläche der Fotoleitertrommel
14 belichtet wird. Abhängig von den Steuerdaten
der Steuerelektronik variieren die ICs die von den LEDs
abgegebene Lichtmenge, so daß verschiedene Ladungszustände
auf der Oberfläche der Fotoleitertrommel 14 und damit unterschiedliche
Grau- bzw. Farbtöne beim späteren Druckbild
realisiert werden können. Durch das ständige Ein- und Ausschalten
der LEDs der LED-Arrays 38 entsteht Wärme, die über
den Wärmekollektor 12 abgeführt werden muß. Zu diesem Zweck
überträgt das aus Kupfer bestehende U-Profil 16 die von den
LEDs erzeugte Wärme an das im Hohlraum 34 befindliche Wasser
36, das die Wärme speichert und nach und nach über die Grundplatte
32 und die Trägerplatte 60 an die Kühlrippen 62 des
Kühlgitters 58 überträgt, die die Wärme an die Umgebung
abgeben.Activate as soon as the printer starts printing
the individual ICs of the
Claims (8)
- Electro-optical character generator for exposing the surface of a photoconductor, in particular of a photoconductor in a high-performance printer,having a heat collector (12), on the carrier surface (22) of which facing the photoconductor (14), there are arranged a plurality of light-emitting elements, arranged in a row (40), for the exposure of the surface of the photoconductor (14), which elements are connected in heat-conductive fashion with the heat collector (12), and in which is fashioned a hollow space (34) running in the direction of the row (40), which is filled with a liquid (36) whose quotient of supplied quantity of heat and change of temperature per volume unit is greater than or equal to 2.5 kJ/dm3K, andhaving a cooling means (58, 74) connected with the heat collector (12) for giving off the quantity of heat collected by the heat collector (12) to the environment, characterized in thatthe hollow space (34) in the heat collector (12) is fashioned by a closed, thinwalled hollow profile (16, 32) running in the direction of the row (40) and being closed at its two ends.
- Electro-optical character generator according to claim 1, characterized in that the hollow profile is fashioned as U-profile (16) that has a base (18) on the upper side of which facing the photoconductor (14) the carrier surface (22) is fashioned, and that has two limbs (24, 26) that are at least approximately equal in length and that protrude from the lower side of the base (18), which side faces away from the upper side, and in that the U-profile (16) is closed via a base plate (32) connecting the limbs (24, 26) with one another, in such a way that the hollow space (34) extending in the direction of the row (40) is fashioned, which hollow space is respectively closed at each of its two open ends by a terminating plate.
- Electro-optical character generator according to claim 2, characterized in that a projection (20), raised from the base (18) and extending in the direction of the row (40) is formed essentially in the center of the upper side of the base (18), which projection forms the carrier surface (22).
- Electro-optical character generator according to claim 2 or 3, characterized in that the base plate (32) is fashioned in one piece with the limbs (24, 26) of the U-profile (16).
- Electro-optical character generator according to claim 2 or 3, characterized in that the base plate (32) is connected in liquid-tight fashion with the limbs (24, 26) of the U-profile (16) by means of joining, preferably by hard soldering.
- Electro-optical character generator according to one of the preceding claims, characterized in that the quotient of the liquid lies within a range from 3.0 kJ/dm3K to 4.5 kJ/dm3K.
- Electro-optical character generator according to one of the preceding claims, characterized in that the liquid is water.
- Electro-optical character generator according to one of the preceding claims, characterized in that the cooling means is a cooling grid (58) with a carrier plate (60) fastened in heat-conducting fashion to the hollow profile (16, 32), from the plate side of which facing away from the hollow profile (16, 32) there protrude in perpendicular fashion several cooling ribs (62) arranged in parallel with a spacing from one another.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19612174 | 1996-03-27 | ||
| DE19612174A DE19612174C2 (en) | 1996-03-27 | 1996-03-27 | Electro-optical character generator |
| PCT/DE1997/000641 WO1997036212A1 (en) | 1996-03-27 | 1997-03-26 | Electro-optical character generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0890141A1 EP0890141A1 (en) | 1999-01-13 |
| EP0890141B1 true EP0890141B1 (en) | 2002-01-30 |
Family
ID=7789629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97918057A Expired - Lifetime EP0890141B1 (en) | 1996-03-27 | 1997-03-26 | Electro-optical character generator |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6121995A (en) |
| EP (1) | EP0890141B1 (en) |
| DE (2) | DE19612174C2 (en) |
| WO (1) | WO1997036212A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0011916D0 (en) | 2000-05-17 | 2000-07-05 | Cambridge Consultants | Printing |
| DE10051128C2 (en) * | 2000-10-16 | 2002-11-21 | Oce Printing Systems Gmbh | Device and method for the liquid-tight sealing of a cooling hole in an electro-optical printer |
| NL1018243C2 (en) * | 2001-06-08 | 2002-12-10 | Oce Tech Bv | Printhead for an image-forming device and image-forming device provided with such a printhead. |
| JP4305896B2 (en) * | 2002-11-15 | 2009-07-29 | シチズン電子株式会社 | High brightness light emitting device and manufacturing method thereof |
| JP4085963B2 (en) * | 2002-12-05 | 2008-05-14 | 松下電器産業株式会社 | Image forming apparatus |
| DE10319526A1 (en) * | 2003-04-30 | 2004-07-29 | OCé PRINTING SYSTEMS GMBH | Cooling device for character generator in electrophotographic printer or copier, has cooling tube plastically deformed to be in close thermal contact with heat collector. |
| CN103392243A (en) | 2010-12-21 | 2013-11-13 | 安东尼·德罗斯 | Fluid cooled lighting element |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63168372A (en) * | 1987-01-05 | 1988-07-12 | Alps Electric Co Ltd | Light-emitting diode printing head |
| US4894709A (en) * | 1988-03-09 | 1990-01-16 | Massachusetts Institute Of Technology | Forced-convection, liquid-cooled, microchannel heat sinks |
| US4875057A (en) * | 1988-09-01 | 1989-10-17 | Eastman Kodak Company | Modular optical printhead for hard copy printers |
| JPH03221473A (en) * | 1990-01-26 | 1991-09-30 | Hitachi Koki Co Ltd | Led printer |
| EP0575666B1 (en) * | 1992-06-23 | 1997-03-19 | Océ-Nederland B.V. | Electro-optical head assembly |
| DE4221949C2 (en) * | 1992-07-02 | 1996-07-25 | Siemens Ag | Optical print head |
| US5323292A (en) * | 1992-10-06 | 1994-06-21 | Hewlett-Packard Company | Integrated multi-chip module having a conformal chip/heat exchanger interface |
| EP0629508B1 (en) * | 1993-06-18 | 1996-10-09 | Xeikon Nv | Temperature controlled LED recording head |
| JPH07169889A (en) * | 1993-12-15 | 1995-07-04 | Hitachi Cable Ltd | Heat sink |
-
1996
- 1996-03-27 DE DE19612174A patent/DE19612174C2/en not_active Expired - Fee Related
-
1997
- 1997-03-26 DE DE59706240T patent/DE59706240D1/en not_active Expired - Lifetime
- 1997-03-26 WO PCT/DE1997/000641 patent/WO1997036212A1/en active IP Right Grant
- 1997-03-26 US US09/155,428 patent/US6121995A/en not_active Expired - Lifetime
- 1997-03-26 EP EP97918057A patent/EP0890141B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19612174A1 (en) | 1997-10-02 |
| US6121995A (en) | 2000-09-19 |
| EP0890141A1 (en) | 1999-01-13 |
| WO1997036212A1 (en) | 1997-10-02 |
| DE59706240D1 (en) | 2002-03-14 |
| DE19612174C2 (en) | 1998-04-09 |
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