WO2004054810A1 - インクジェットプリンタ - Google Patents
インクジェットプリンタ Download PDFInfo
- Publication number
- WO2004054810A1 WO2004054810A1 PCT/JP2003/015979 JP0315979W WO2004054810A1 WO 2004054810 A1 WO2004054810 A1 WO 2004054810A1 JP 0315979 W JP0315979 W JP 0315979W WO 2004054810 A1 WO2004054810 A1 WO 2004054810A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ultraviolet
- ultraviolet light
- ink
- ink jet
- jet printer
- Prior art date
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Classifications
-
- 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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00218—Constructional details of the irradiation means, e.g. radiation source attached to reciprocating print head assembly or shutter means provided on the radiation source
Definitions
- the present invention relates to an ink jet printer, and more particularly to an ink jet printer that forms an image by curing ink by irradiating ultraviolet rays.
- an ink jet printer having a recording head provided with a nozzle for discharging ink which is cured by irradiating ultraviolet rays and an ultraviolet irradiating device for irradiating ultraviolet rays for curing ink has been developed. Used.
- Patent Document 1 Japanese Unexamined Patent Publication No. Sho 60-1332767, hereinafter referred to as “Patent Document 1”).
- Patent Document 1 a part of the ultraviolet light emitted from the ultraviolet light source is reflected by the inner surface of the cover member covering the light source, the surface of the recording medium, etc., and reaches the recording head. Had been lost.
- the ultraviolet light emitted from the ultraviolet light source 15 and reflected on the surface of the cover member 16 perpendicular to the recording medium 17 has an incident angle R on the surface of the recording medium 17. Is large and the reflection angle r on the surface of the recording medium 17 is large, so that the light easily passes through the space between the cover member 16 and the recording medium 1 ⁇ and enters the recording head 6.
- the ink adhering to the nozzle surface of the recording head where the nozzle of the recording head is provided is irradiated with ultraviolet light to the ink in the nozzle, whereby the ink becomes viscous or hardened, and the ink is cured.
- ultraviolet light there is a problem that discharge failure occurs.
- UV Radical polymerizable inks and cationic polymerizable inks are known as inks that cure by curing, but among these, cationic polymerizable inks are not susceptible to polymerization inhibition by oxygen like radical polymerizable inks. Therefore, it has high sensitivity to ultraviolet light, and has the property that acid, which is an active species, stores light energy.
- the present invention reduces the amount of ultraviolet light that reaches the nozzle surface by reflection while securing the necessary and sufficient amount of ultraviolet light to cure the ink that has landed on the recording medium, and prevents the ink from thickening and curing to form the ink.
- An object of the present invention is to provide an ink jet printer capable of performing stable ejection.
- a recording head provided with a nozzle that ejects ink that cures by irradiating ultraviolet light, and an ultraviolet light source that generates ultraviolet light that cures the ink are provided.
- An ultraviolet ray irradiating device provided, the ink ejected from the nozzle is landed on a recording medium, and the recording medium is irradiated with ultraviolet rays by the ultraviolet ray irradiating device to cure the ink to form an image.
- the ultraviolet irradiation device includes a cover member that covers the ultraviolet light source, and a surface of the cover member that reflects ultraviolet light emitted from the ultraviolet light source to the recording head has an ultraviolet reflectance of another surface. It is lower than the UV reflectance of the surface.
- the ultraviolet reflectance of the inner surface of the cover member that reflects ultraviolet light emitted from the ultraviolet light source to the recording head is higher than the ultraviolet reflectance of the other surfaces. Is also getting lower. Therefore, the ultraviolet light reflected on the inner surface of the cover member that reflects the ultraviolet light emitted from the ultraviolet light source to the recording head becomes ultraviolet light of reduced energy and reaches the recording head.
- the ultraviolet light reflected from the inner surface of the cover member other than the surface that reflects the ultraviolet light emitted from the ultraviolet light source to the recording head is directed to the recording head. Irradiates the surface of the recording medium with higher energy than the ultraviolet light reflected by the reflecting surface. This makes it possible to reduce the amount of ultraviolet light that reaches the nozzle surface by reflection while securing the amount of ultraviolet light necessary and sufficient to cure the ink that has landed on the recording medium, and to prevent the ink from hardening viscously. Ink can be stably ejected.
- a reflective member that reflects ultraviolet light may be provided on an inner surface of the cover member that is perpendicular to the recording medium and that is close to the recording head.
- the reflecting member that reflects ultraviolet light is provided on the inner surface of the surface of the cover member that is perpendicular to the recording medium and that is close to the recording head.
- the ultraviolet rays are reflected by the reflecting member and are effectively irradiated on the surface of the recording medium.
- the ultraviolet rays incident on the surface of the recording medium are reflected on the surface of the recording medium, the ultraviolet rays are reflected by the recording head. Does not reach the recording head as it is in the opposite direction.
- An ultraviolet absorbing member that absorbs ultraviolet light may be provided on an inner surface of the cover member that is perpendicular to the recording medium and that is apart from the recording head.
- an ultraviolet absorbing member that absorbs ultraviolet light is provided on the inner surface of the cover member that is perpendicular to the recording medium and that is remote from the recording head.
- the ultraviolet light incident on this surface is absorbed by the ultraviolet absorbing member, and the energy is reduced.
- the ultraviolet rays that are reflected and incident on the recording head are absorbed by the ultraviolet absorbing member and the energy is reduced, but the ultraviolet rays that are not incident on the recording head even when reflected are irradiated on the surface of the recording medium with high energy. Is done.
- the cover member may be provided with a partition member that partitions the inside of the cover member. According to the present invention, if there is no partition member, a part of the ultraviolet rays reflected by the cover member and reaching the recording head can be blocked by the partition member. Is reduced.
- an ultraviolet absorbing member that absorbs ultraviolet light is provided on a surface of the partition member perpendicular to the recording medium and on a surface on the recording head side, and the surface of the partition member is perpendicular to the recording medium. It is preferable to provide a reflecting member that reflects ultraviolet light on a surface remote from the recording head.
- the ultraviolet light incident on the surface provided with the ultraviolet absorbing member is absorbed by the ultraviolet absorbing member, and the energy is reduced.
- the ultraviolet light incident on the surface on which the reflection member is provided is reflected by the reflection member and is effectively irradiated on the surface of the recording medium. Therefore, it is possible to reduce the amount of ultraviolet light that reaches the nozzle surface by reflection while securing a sufficient amount of ultraviolet light necessary to cure the ink that has landed on the recording medium. Can be stably discharged.
- the ultraviolet irradiation device may be provided with a plurality of the ultraviolet light sources.
- the amount of ultraviolet light applied to the recording medium increases, and the ink that has landed on the recording medium is cured in a short time. Therefore, a good image can be formed.
- the ultraviolet light source is preferably one of a high-pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, and an LED.
- the ultraviolet light source includes one of a high-pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, and an LED.
- the UV reflectance of the inner surface of the cover member that reflects ultraviolet light emitted from the ultraviolet light source to the recording head becomes lower than the UV reflectance of the other surfaces. Therefore, the ultraviolet light reflected on the inner surface of the cover member, which reflects the ultraviolet light emitted from the ultraviolet light source to the recording head, has reduced energy.
- -UV rays reach the recording head. That is, it is possible to reduce the amount of ultraviolet light that reaches the nozzle surface due to reflection.
- the ink is preferably a cation-curable ink.
- the ultraviolet reflectance of the inner surface of the cover member that reflects ultraviolet light emitted from the ultraviolet light source to the recording head is lower than the ultraviolet reflectance of the other surfaces. Therefore, the ultraviolet light reflected on the inner surface of the cover member that reflects the ultraviolet light emitted from the ultraviolet light source to the recording head becomes ultraviolet light of reduced energy and reaches the recording head. Therefore, even if the ink is a cation-curing type ink, the reaction with the ultraviolet light on the nozzle surface and the discharge port thereof is prevented, and the amount of accumulated ultraviolet energy is reduced.
- the ink that has landed on the recording medium can be cured in a short time by irradiating the ink with ultraviolet rays, thereby forming an image of good image quality. be able to.
- the recording head is of a serial head type, and the ultraviolet irradiation device may be provided on at least one of both sides of the recording head in the main scanning direction.
- the recording head and the ultraviolet irradiation device reciprocate, so that the recording head is reciprocated.
- the ultraviolet curable ink ejected from the nozzle and landed on the recording medium is irradiated with ultraviolet rays.
- the ultraviolet reflectance of the inner surface of the cover member that reflects ultraviolet rays to the recording head is lower than the ultraviolet reflectance of the other surfaces, the inner surface of the cover member has The ultraviolet light reflected from the surface that reflects the ultraviolet light to the recording head reaches the recording head as ultraviolet light having reduced energy. Therefore, it is possible to prevent the ink from being hardened by viscous hardening and to discharge the ink stably.
- the recording head is of a line head type, and the ultraviolet irradiation device may be provided on the downstream side in the direction in which the recording medium of the recording head is transported.
- the ultraviolet irradiation device since the ultraviolet irradiation device is provided on the downstream side in the direction in which the recording medium of the recording head is conveyed, the recording medium is ejected from the recording head and moved to the recording medium by moving the recording medium. Ultraviolet rays are applied to the landed ultraviolet curing ink. At this time, since the ultraviolet reflectance of the inner surface of the cover member of the ultraviolet irradiation device that reflects ultraviolet rays to the recording head is lower than the ultraviolet reflectance of the other surfaces, the cover member The ultraviolet light reflected on the inner surface of the surface, which reflects ultraviolet light to the recording head, becomes ultraviolet light having reduced energy and reaches the recording head.
- the ink can be stably ejected by preventing the ink from increasing or hardening.
- a recording head that discharges an ink that is cured by irradiating ultraviolet rays from a discharge port of a nozzle toward a recording medium, and a recording head that discharges an ink that is cured on the recording medium.
- an ultraviolet irradiation device that irradiates ultraviolet light from an ultraviolet light source.
- the ultraviolet irradiation device includes a cover member that covers the ultraviolet light source,
- the cover member is open toward the recording surface side of the recording medium, and includes an orthogonal surface portion substantially orthogonal to the recording surface, and an opposing surface portion having at least an area facing the recording surface.
- the UV reflectance of the orthogonal surface portion is lower than the UV reflectance of the facing surface portion.
- the ultraviolet reflectance of the orthogonal surface portion substantially orthogonal to the recording surface of the cover member is the ultraviolet reflectance of the facing surface portion having at least a region facing the recording surface of the cover member.
- the angle of incidence of the ultraviolet light reflected on the orthogonal surface portion on the recording surface is larger than the angle of incidence of the ultraviolet light reflected on the opposite surface portion on the recording surface. Therefore, the ultraviolet light reflected on the orthogonal surface portion easily passes between the cover member and the recording surface as compared with the ultraviolet light reflected on the opposite surface portion, and is incident on the nozzle surface where the discharge port of the recording head is located. It's getting easier.
- the ultraviolet reflectance of the orthogonal surface portion is lower than the ultraviolet reflectance of the opposite surface portion, the amount of the ultraviolet light incident on the inner surface of the orthogonal surface portion reflected on the inner surface of the orthogonal surface portion is smaller than that of the opposite surface portion. It is reduced as compared with the surface portion. This makes it possible to reduce the amount of ultraviolet light reflected on the orthogonal plane and incident on the recording surface, so that the amount of ultraviolet light reflected on the recording surface and traveling toward the recording head can be reduced. In other words, from the UV irradiation device The amount of incident ultraviolet light on the nozzle surface can be reduced.
- the ultraviolet light reflected on the facing surface has a smaller angle of incidence on the recording surface than the ultraviolet light reflected on the orthogonal surface and is less likely to be incident on the recording head side, so that the ultraviolet reflectance can be higher than that on the orthogonal surface.
- the ultraviolet reflectance can be higher than that on the orthogonal surface.
- the angle of incidence on the recording surface refers to the angle at which ultraviolet rays enter a line segment perpendicular to the recording surface.
- the opposing surface portion may be provided with a reflecting member that reflects ultraviolet light emitted from the ultraviolet light source toward the recording surface of the recording medium.
- the reflecting member that reflects the ultraviolet light emitted from the ultraviolet light source toward the recording surface of the recording medium is provided on the facing surface portion, the reflecting member effectively transmits the ultraviolet light toward the recording surface. Can be reflected. That is, by providing the reflecting member on the opposing surface portion, the irradiation amount of the ultraviolet light from the ultraviolet irradiation device can be increased to a predetermined amount necessary for hardening the ink. Further, in this case, even if the ultraviolet light emitted from the ultraviolet light source is reflected on the orthogonal surface portion, the ultraviolet light reflectance of the orthogonal surface portion is lower than the ultraviolet reflectance of the opposite surface portion, so that the light enters the nozzle surface. The amount of UV light will be reduced.
- the orthogonal surface portion may be provided with an ultraviolet absorbing member including a material that absorbs ultraviolet light emitted from the ultraviolet light source.
- the ultraviolet absorbing member absorbs ultraviolet rays at a predetermined ratio, and the ratio can be arbitrarily set within a design range.
- absorbing ultraviolet light has substantially the same meaning as reducing the amount of reflected ultraviolet light. That is, as the ultraviolet ray absorption rate increases, the ultraviolet ray reflectance decreases.
- the orthogonal surface portion is provided with the ultraviolet absorbing member including the material that absorbs the ultraviolet light emitted from the ultraviolet light source, the ultraviolet light incident on the orthogonal surface portion is absorbed, and the recording surface is The amount of ultraviolet light reflected toward the light can be effectively reduced. Therefore, by being reflected on the orthogonal surface and then incident on the recording surface and reflected on this recording surface, the amount of ultraviolet light that passes between the cover member and the recording surface and enters the nozzle surface of the recording head Can be reduced.
- the ultraviolet absorbing member and the recording head can be arranged closer to each other, which can contribute to downsizing of the ink jet printer.
- a plurality of the ultraviolet light sources may be provided.
- the amount of ultraviolet light emitted from these ultraviolet light sources and incident on the orthogonal plane increases, but the ultraviolet reflectance of the orthogonal plane is higher than the ultraviolet reflectance of the opposing plane. , The amount of ultraviolet light incident on the nozzle surface can be effectively reduced.
- the orthogonal plane part includes a middle orthogonal plane part arranged between regions where a plurality of ultraviolet light sources are arranged.
- between the regions where a plurality of ultraviolet light sources are disposed means between line segments passing through the centers of the ultraviolet light sources along a direction substantially perpendicular to the recording surface.
- the angle of incidence of the ultraviolet light reflected on the orthogonal plane on the recording surface is defined by the angle of reflection of the ultraviolet light on the orthogonal plane, and the angle of reflection is defined by the angle of incidence of the ultraviolet light on the orthogonal plane.
- the smaller the angle of incidence of the ultraviolet light on the orthogonal surface, that is, the larger the angle of incidence of the ultraviolet light on the recording surface the more easily the ultraviolet light reflected on the recording surface passes between the recording surface and the cover member. This makes it easy to enter the nozzle surface of the recording head.
- the middle orthogonal plane portion is disposed between the regions where the plurality of ultraviolet light sources are provided, so that the middle orthogonal surface portion and By shortening the distance of the ultraviolet light 1 with respect to the orthogonal plane part, it is possible to increase the angle of incidence of the ultraviolet light emitted from the ultraviolet light source on the medium orthogonal plane part and the orthogonal plane part.
- the angle of incidence of the ultraviolet light reflected on the middle orthogonal surface portion and the orthogonal surface portion on the recording surface can be reduced, so that the amount of ultraviolet light passing between the recording surface and the force bar member can be reduced, Similarly to the invention described in claim 11, it is possible to reduce the amount of ultraviolet light incident on the lip surface. This makes it possible to dispose the ultraviolet irradiation device and the recording head even closer to each other, which can contribute to downsizing of the ink jet printer.
- the angle of incidence on the orthogonal plane and the angle of reflection on the orthogonal plane refer to the angle of incidence and reflection of ultraviolet rays on a line segment orthogonal to the orthogonal plane.
- An optical trap may be provided between the recording head and the ultraviolet irradiation device to capture ultraviolet light emitted from the ultraviolet irradiation device.
- the amount of ultraviolet rays incident on the nozzle surface can be further increased by capturing the ultraviolet light emitted from the ultraviolet irradiation device and reflected on the recording surface toward the recording head by the optical trap. Can be reduced.
- the ultraviolet light source is preferably one of a low pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, and an LED.
- the ultraviolet light source is one of a high-pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, and an LED. Even in this case, since the ultraviolet reflectance of the orthogonal surface portion is made lower than the ultraviolet reflectance of the opposing surface portion, it is possible to surely reduce the amount of ultraviolet light irradiated from the ultraviolet irradiation device on the nozzle surface. it can.
- the ink is preferably a cation-curable ink.
- the cation-curable ink has a higher sensitivity to ultraviolet light than the radical-curable ink and also has a higher light energy of an acid as an active species. Due to the nature of accumulation, the recording head nozzle surface is more susceptible to ultraviolet light.However, even with such a cation-curable ink, the ultraviolet reflectance of the orthogonal surface part is lower than that of the opposite surface part. By making the reflectance lower than the ultraviolet reflectance, it is possible to reliably reduce the amount of ultraviolet light emitted from the ultraviolet irradiation device to the nozzle surface. Therefore, it is possible to prevent the force thione curing type ink from being thickened or cured on the nozzle surface and its discharge port.
- the recording method is preferably a serial method or a line method.
- the serial system means that the recording head is reciprocated in the scanning direction while the ink is transferred from the recording head to the recording medium whose conveyance in the direction perpendicular to the scanning direction of the recording head is stopped.
- the line method is a method in which a recording head is provided in the width direction of the recording medium (a direction orthogonal to the conveying direction of the recording medium) and an image is recorded based on the conveyance of the recording medium.
- the ultraviolet reflectance of the orthogonal surface portion is made lower than the ultraviolet reflectance of the opposing surface portion, so that the ultraviolet light irradiated from the ultraviolet irradiation device is irradiated.
- the amount of incidence on the nozzle surface can be reliably reduced.
- FIG. 1 is a diagram showing a configuration of a first embodiment of an ink jet printer according to the present invention.
- FIG. 2A is a perspective view of the inside of the carriage of the ink jet printer according to the present invention
- FIG. 2B is a perspective view of the inside of the carriage of the ink jet printer according to the present invention as viewed from below.
- FIG. 3A is a perspective view of the ultraviolet irradiation device of the ink jet printer according to the present invention
- FIG. 3B is a sectional view taken along line AA of FIG. 3A.
- FIG. 4 is an explanatory diagram schematically showing reflection of ultraviolet rays in the ultraviolet irradiation device of the ink jet printer according to the present invention.
- FIG. 5A is a perspective view of an ultraviolet irradiation device of the ink jet printer according to the present invention, and
- FIG. 5B is a sectional view taken along line BB of FIG. 5A.
- FIG. 6A is a perspective view of an ultraviolet irradiation device of the ink jet printer according to the second embodiment
- FIG. 6B is a cross-sectional view taken along line C-C of FIG. 6A.
- FIG. 7A and 7B are explanatory views schematically showing reflection of ultraviolet rays in the ultraviolet irradiation device of the ink jet printer according to the second embodiment.
- FIG. 8A is a perspective view of an ultraviolet irradiation device of the ink jet printer according to the second embodiment
- FIG. 8B is a cross-sectional view taken along line DD of FIG. 8A.
- FIG. 9A is a perspective view of a support of the ink jet printer according to the third embodiment
- FIG. 9B is a perspective view of the support of the inkjet printer according to the third embodiment when viewed from below.
- FIG. 10 is a front view of a support base of the ink jet printer according to the third embodiment.
- FIG. 11 is a diagram schematically showing reflection of ultraviolet light emitted from an ultraviolet light source of the ultraviolet irradiation device of the inkjet printer according to the fourth embodiment.
- FIG. 12A and FIG. 12B are diagrams showing an ultraviolet irradiation device that does not include an ultraviolet absorbing member on the inner surface of the reflecting member.
- FIG. 13A is a perspective view schematically showing an ultraviolet irradiation device of the ink jet printer according to the fifth embodiment
- FIG. 13B is a sectional view taken along line EE of FIG. 13A
- FIG. 14 is a diagram schematically showing the reflection of ultraviolet light emitted from the ultraviolet light source of the ultraviolet irradiation device in FIG. 13A.
- FIG. 15A is a perspective view schematically showing an ultraviolet irradiation device of the ink jet printer according to the sixth embodiment
- FIG. 15B is a sectional view taken along line FF of FIG. 15A
- FIG. 16 is a diagram schematically showing a head portion provided in the ink jet printer according to the seventh embodiment when viewed from the side.
- FIG. 17 is a view schematically showing reflection of ultraviolet rays in a conventional ultraviolet irradiation device of an ink jet printer.
- BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 16.
- the ink jet printer according to the first embodiment is a serial head type ink jet printer, and includes a printer main body 1 and a support base 2 for supporting the printer main body 1, as shown in FIG.
- the printer body 1 is provided with a bar-shaped guide rail 3, and a carriage 4 is supported on the guide rail 3.
- the carriage 4 reciprocates in the main scanning direction X along the guide rail 3 by a drive mechanism (not shown).
- the carriage 4 is provided with a nozzle 5 for discharging inks of yellow (Y), magenta ( ⁇ ), cyan (C), and black (K).
- the recording head 6 is mounted.
- the carriage 4 is indicated by a broken line, and a state in which the carriage 4 is seen through is illustrated.
- the recording head 6 consists of one recording unit with each color of yellow (Y), magenta ( ⁇ ), cyan (C), and black (K), and two recording units arranged in the main scanning direction X. ⁇ They are arranged so as to be shifted in the sub-scanning direction Y orthogonal to the direction X.
- An intermediate tank 7 for storing ink of each color is connected to each recording head 6 via an ink supply pipe 8.
- an ultraviolet irradiation device 9 for irradiating the ink ejected from the nozzle 5 onto the recording medium 17 with ultraviolet light is provided. Have been. Further, between the ultraviolet irradiation device 9 and the recording head 6, an optical trap 10 for capturing ultraviolet rays incident on the recording head 6 side is provided.
- the optical trap 10 is a long member extending in the sub-scanning direction Y, and the length is at least equal to the length of the ultraviolet irradiation device 9 in the sub-scanning direction Y.
- the optical trap 10 is a concave member that opens toward the recording medium 17, and is arranged, for example, so that the opened edge is substantially parallel to the recording medium 17.
- the shape of the optical trap 10 may be any shape as long as ultraviolet rays can enter the inside of the optical trap 10 and the incident ultraviolet rays are repeatedly reflected on the inner surface of the optical trap 10.
- an ultraviolet absorbing member (not shown) made of a material having a high ultraviolet absorptivity may be provided on the inner surface of the optical trap 10. In this case, ultraviolet light incident on the inner surface of the optical trap 10 can be reliably absorbed.
- the method of providing the ultraviolet absorbing member on the inner surface of the optical trap 10 and the material of the ultraviolet absorbing member may be the same as the method and the material of providing the ultraviolet absorbing member 19 on the inner surface of the reflecting member 18 described later. good.
- the center of the movable range of the carriage 4 is a recording area for recording on the recording medium 1, as shown in FIG.
- An ink supply unit 12 that supplies ink to an intermediate tank 7 mounted on the carriage 4 via an ink supply path (not shown) is provided at one end outside the recording area within the movable range of the carriage 4.
- a maintenance unit 13 for cleaning the recording head 6 is provided at the other end of the carriage 4 within the movable range and outside the recording area.
- the printer body 1 is provided with a transport mechanism (not shown) for feeding the recording medium 17 in the sub-scanning direction Y.
- the transport mechanism includes, for example, a transport motor and a transport roller (not shown), and transports the recording medium 17 in the sub-scanning direction Y by rotating the transport roller by driving the transport motor. .
- the transport mechanism intermittently transports the recording medium 17 by repeatedly transporting and stopping the recording medium 17 in accordance with the operation of the carriage 4 during image recording.
- a platen 14 that supports the recording medium 17 from a non-recording surface is provided in a recording area below the carriage 4.
- the platen 14 is formed of a plate-like member.
- the ultraviolet irradiation device 9 has a box-shaped cover member 16 that opens toward the recording medium 17 side. Inside the cover member 16, a linear shape along the sub scanning direction Y is provided. A plurality of ultraviolet light sources 15 are arranged in the main scanning direction X.
- the ultraviolet light source 15 has a length equal to the sum of the lengths of the two recording units in the sub-scanning direction Y.
- the ultraviolet light source 15 includes a high-pressure mercury lamp, a metal halide lamp, At least one of hot cathode tube, cathode tube, and LED is applied.
- a reflecting member 18 On the entire inner surface of the cover member 16, there is provided a reflecting member 18 that reflects ultraviolet light diffused and irradiated from the ultraviolet light source 15.
- a high-purity aluminum reflection plate that efficiently reflects ultraviolet rays over the entire wavelength range is applied.
- a cold mirror glass molded plate in which a thin film of a metal compound mainly containing aluminum is vapor-deposited on the glass surface, while efficiently reflecting ultraviolet light, emits visible light and infrared light that does not contribute to the curing of ink, behind the mirror.
- a decrease in luminous efficiency due to heat generation of the light source can be suppressed, which is preferable.
- the inner surface of the separation vertical surface which is a surface perpendicular to the recording medium 17 of the cover member 16 and a surface separated from the recording head 6, is covered with a reflecting member 18 so as to be an ultraviolet absorbing member.
- a reflecting member 18 so as to be an ultraviolet absorbing member.
- an ultraviolet absorbing member 19 is not provided on the inner surface of the cover member 16 which is perpendicular to the recording medium 17 and is close to the recording head 6, and the ultraviolet absorbing member 19 is not provided. 18 is exposed.
- the reflectance of the separated vertical plane is lower than that of the near vertical plane.
- Examples of the method of providing the ultraviolet absorbing member 19 include a method of plating, vapor-depositing, or sputtering a material having a high ultraviolet absorption rate, and a method of applying a material having a high ultraviolet absorption rate.
- the high UV absorbency material such as carbon black, titanium oxide formed into an ultra-particles, zinc oxide, iron oxide (shed _ F e 2 0 3, F e 3 0 4) free of powder such as Organic materials such as organic compounds, benzotriazole-based compounds, and aromatic compounds, and the like, and the ultraviolet absorbing member 19 is formed of these materials.
- the ink used in the present embodiment will be described.
- the photocuring system (No. 1), which is described in “Photocuring Technology—Selection of Resin and Initiator and Measurement and Evaluation of Compounding Conditions and Degree of Curing— (Technical Association Information)” (Chapter 4) ”,“ Curing system using photoacid / base generator (Section 1) ”,“ Light-induced alternating copolymerization (Section 2) ”, etc. It may be cured by radical polymerization.
- the ink used in the present embodiment is used for irradiation with ultraviolet light as light. It is a photo-curable ink having more curable properties, and contains at least a polymerizable compound (including a known polymerizable compound), a photoinitiator, and a coloring material as main components.
- a polymerizable compound including a known polymerizable compound
- a photoinitiator e.g., a known polymerizable compound
- a coloring material e.g., a known polymerizable compound
- the photoinitiator may be excluded.
- the photocurable inks are roughly classified into radical polymerizable inks containing a radical polymerizable compound and cationic polymerizable inks containing a cationic polymerizable compound as polymerizable compounds.
- Each of the inks can be applied as an ink used in the embodiment, and a hybrid type ink in which a radical polymerization ink and a cationic polymerization ink are combined may be applied as the ink used in the present embodiment.
- cationic polymerization inks having less or no effect of inhibiting the polymerization reaction due to oxygen are more excellent in functionality and versatility, and therefore, in the present embodiment, in particular, cationic polymerization inks are used.
- the cationic polymerization ink used in the present embodiment is, specifically, a mixture containing at least a cationic polymerizable compound such as an oxetane compound, an epoxy compound, a vinyl ether compound, a light-powered thione initiator, and a coloring material.
- a cationic polymerizable compound such as an oxetane compound, an epoxy compound, a vinyl ether compound, a light-powered thione initiator, and a coloring material.
- a cationic polymerizable compound such as an oxetane compound, an epoxy compound, a vinyl ether compound, a light-powered thione initiator, and a coloring material.
- a cationic polymerizable compound such as an oxetane compound, an epoxy compound, a vinyl ether compound, a light-powered thione initiator, and a coloring material.
- the inks used in the present embodiment are, as described above, cured by irradiation with ultraviolet rays, but not necessarily. Is not limited, and may be cured by irradiation with light other than ultraviolet light.
- the term “light” as used herein refers to light in a broad sense and includes electromagnetic waves such as ultraviolet rays, electron beams, X-rays, visible rays, and infrared rays.
- the ink used in the present embodiment includes a polymerizable compound that is polymerized and cured by light other than ultraviolet light, and a photoinitiator that initiates a polymerization reaction between the polymerizable compounds by light other than ultraviolet light. You can do it.
- a photo-curable ink that cures with light other than ultraviolet light a light source that irradiates the light must be used instead of the ultraviolet light source 15.
- the recording medium 17 used in the present embodiment will be described.
- the recording medium 17 used in the present embodiment includes a normal ink jet printing
- Various types of paper such as plain paper, recycled paper, glossy paper, etc., various types of fabrics, various types of nonwoven fabrics, lumber, metal, glass, and other recording media 17 applicable to the media are applicable.
- a long resin film wound in a roll shape is used as the recording medium 17.
- a transparent or opaque non-absorbent resin film used for so-called soft packaging can be applied.
- resin for the resin film include polyethylene terephthalate, polyester, polyolefin, polyamide, polyesteramide, polyether, polyimide, polyamideimide, polystyrene, polycarbonate, and poly-p-phenylene sulfide.
- Polyetherester, polychlorinated vinylpoly (meth) acrylate, polyethylene, polypropylene, nylon, etc. are also applicable. Further, copolymers of these resins, mixtures of these resins, and cross-linking of these resins What is done is also applicable.
- the choice of stretched polyethylene terephthalate, polystyrene, polypropylene, or nylon as the resin type of the resin film is due to the transparency, dimensional stability, rigidity, environmental load, cost, etc. of the resin film. It is preferable to use a resin film having a thickness of 2 to 100 / m (preferably 6 to 50 ⁇ ). Further, the surface of the resin film support may be subjected to a surface treatment such as a corona discharge treatment and an easy adhesion treatment.
- known opaque recording media 17 such as various papers coated with a resin, a film containing a pigment, and a foamed film can be applied.
- the drive mechanism of the carriage 4 When forming an image on the recording medium 17, the drive mechanism of the carriage 4 operates to cause the carriage 4 to reciprocate above the recording medium 17 in the main scanning direction X, and based on predetermined image information.
- An ink of a predetermined color is ejected from the nozzle 5 of the recording head 6.
- the ejected ink sequentially lands on the recording medium 17.
- the ultraviolet light constituting the ultraviolet irradiation device 9 provided in the carriage 4 is Ultraviolet light is sequentially irradiated by the external light source 15, and the ink is cured on the recording medium 17.
- the image is recorded on the recording medium 17 by the transport mechanism operating and the recording medium 17 being transported in the sub-scanning direction Y.
- the recording head 6 When ink adheres to the nozzle surface, the recording head 6 is appropriately cleaned by the maintenance unit 13.
- the reflection and absorption of the ultraviolet light emitted from the ultraviolet light source 15 on the inner surface of the ultraviolet irradiation device 9 and the surface of the recording medium 17 will be described.
- the ultraviolet light applied to the ultraviolet absorbing member 19 is absorbed by the ultraviolet absorbing member 19 and becomes low energy ultraviolet light.
- the light is reflected and irradiated on the surface of the recording medium 17.
- the ultraviolet rays having the reduced energy are absorbed and reflected on the surface of the recording medium 17, become ultraviolet rays having a lower energy, and are irradiated to the nozzle surface of the recording medium 17.
- the ultraviolet light applied to the reflecting member 18 is reflected by the ultraviolet reflectance of the reflecting member 18, and the energy of the recording medium 17 is increased by high energy. Irradiated on the surface. Then, the high energy ultraviolet rays are absorbed and reflected on the surface of the recording medium 17, but at this time, they are reflected in a direction opposite to the recording head 6 and inside the cover member 16, It does not reach the nozzle surface of recording head 6.
- the ultraviolet light emitted perpendicular to the recording medium 17 is irradiated onto the surface of the recording medium 17 with the same energy as the emitted ultraviolet light. This high-energy ultraviolet light does not reach the nozzle surface of the recording head 6 as it is.
- the ultraviolet light that is incident on the recording head 6 by reflection becomes low-energy ultraviolet light and reaches the lip surface of the recording medium 17.
- ultraviolet rays which are not incident on the recording head 6 even when reflected are radiated to the surface of the recording medium 17 with high energy. Therefore, the ink that has landed on the recording medium 17 is cured. UV light reaching the nozzle surface by reflection can be reduced while ensuring a sufficient amount of ultraviolet light necessary for the ink to be reflected, and the ink can be discharged stably by preventing the ink from viscous hardening. .
- the ultraviolet irradiation device 9 and the recording head 6 can be arranged close to each other, and the inkjet printer can be downsized. is there.
- two recording units each including recording heads 6 of yellow (Y), magenta ( ⁇ ), cyan (C), and black (K) are provided, and one recording unit is provided for each recording unit.
- the ultraviolet irradiation devices 9 are provided one by one.However, the present invention is not limited to this. If the ultraviolet irradiation devices 9 are provided on at least one of both sides of the recording head 6 in the main scanning direction X, the recording is performed. The number and arrangement of the heads 6 and the ultraviolet irradiation devices 9 are arbitrary.
- a reflecting member 18 that reflects ultraviolet light is provided on the entire inner surface of the cover member 16, and an ultraviolet absorbing member is provided on the inner surface of the separated vertical surface so as to cover the reflecting member 18.
- the UV reflectance of the separated vertical surface is not limited to this as long as it is lower than the UV reflectance of other surfaces.
- the cover member may be made of a reflective material without providing the reflective member 18, and the ultraviolet absorbing member 19 may be provided on the separated vertical surface, or the cover member may be provided without the ultraviolet absorbing member.
- 16 may be made of an ultraviolet absorbing material, and a reflection member may be provided on a surface other than the vertical separation surface.
- the cover member 16 has a box shape that opens toward the recording medium 17 side, but is not limited to this. As shown in FIGS. 5A and 5B, It may have an arched shape that opens toward the recording medium 17 side.
- the reflecting member 118 is provided on the entire inner surface of the cover member 116, and the cover member 116 is a surface perpendicular to the recording medium 17 and the recording head 106.
- the ultraviolet absorbing member 119 may be provided on the surface far from the surface so as to cover the reflecting member 118. In this way, by making the cover member 116 arch-shaped, the width of the ultraviolet irradiation device 109 in the main scanning direction X can be made smaller than that of a box-shaped cover member. The size can be reduced without reducing the number. Accordingly, the size of the carriage 4 can be reduced, and the size of the entire inkjet printer can be reduced. [Second embodiment]
- the inkjet printer according to the second embodiment has the same configuration as that of the inkjet printer according to the first embodiment except for the configuration of the ultraviolet irradiation device 209. 09 will be described. Further, the components denoted by the same reference numerals as those in the first embodiment are the same as those in the first embodiment, and thus the description thereof will be omitted.
- the ultraviolet irradiation device 209 has a box-shaped cover member 216 opening toward the recording medium 17, and inside the cover member 216, along the sub-scanning direction Y.
- a plurality of linear ultraviolet light sources 15 are arranged in the main scanning direction X.
- a plate-like partition member 21 that partitions the inside of the cover member 21 into three sections is provided perpendicular to the recording medium 17.
- a reflecting member 218 that reflects the ultraviolet rays diffused and irradiated from the ultraviolet light source 15.
- a reflective member 218 is provided on the inner surface of the separation vertical surface of the cover member 216 and a surface of the partition member 221 which is perpendicular to the recording medium 217 and is on the recording head 306 side.
- An ultraviolet absorbing member 219 is provided so as to cover.
- an ultraviolet absorbing member is provided on the inner surface of the close vertical surface of the cover member 2 16 and on the surface of the partition member 21 perpendicular to the recording medium 17 and away from the recording head 6. It is not installed, and the reflection member 218 is exposed.
- the surface of the cover member 2 16 that reflects ultraviolet light emitted from the ultraviolet light source 15 to the recording head 6 has a lower ultraviolet reflectance than the other surfaces. ing.
- the inside and outside of the ultraviolet irradiation device 209 for the ultraviolet light irradiated from the ultraviolet light source 15 The reflection and absorption effects on the surface of the recording medium 17 will be described with reference to FIGS. 7A and 7B.
- the ultraviolet light emitted to the ultraviolet absorbing member 219 provided on the partition member 21 is the ultraviolet absorbing member 2 19.
- the ultraviolet light is absorbed by the light-absorbing member 19 and becomes ultraviolet light of reduced energy, is reflected by the reflecting member 218 provided below the ultraviolet-absorbing member 219, and is irradiated on the surface of the recording medium 17. Thereafter, the ultraviolet light having the reduced energy is absorbed and reflected on the surface of the recording medium 17, becomes an ultraviolet light having a lower energy, and is emitted to the lip surface of the recording medium 17.
- the ultraviolet light emitted from the ultraviolet light source 15 the ultraviolet light emitted to the reflecting member 218 provided on the cover member 216 is reflected at the ultraviolet reflectance of the reflecting member 218. Then, the surface of the recording medium 17 is irradiated with high energy. Thereafter, the high-energy ultraviolet rays are absorbed and reflected on the surface of the recording medium 17, but are reflected in the opposite direction to the recording head 6 at this time. None reach.
- the ultraviolet light emitted perpendicular to the recording medium 17 is irradiated onto the surface of the recording medium 17 with the same energy as the emitted ultraviolet light. This high-energy ultraviolet light does not reach the nozzle surface of the recording head 6 as it is.
- the ultraviolet rays reflected in the cover member 2 16 and reached the recording head 6 (in FIG. 7B, schematically shown by a dotted line). )), Some of them have a small incident angle on the surface of the recording medium 17 and a small reflection angle, so that the recording medium 17 is reflected and illuminated into the cover member 2 16. Fired. A part of the light is reflected by the partition member 21 and is irradiated directly into the cover member 2 16. Therefore, the ultraviolet dose reaching the recording head 6 as a whole is reduced. Further, if there is no partition member 21, part of the ultraviolet light reflected on the surface of the recording medium 17 and reaching the recording head 6 is reflected by the partition member 21, and the recording head 6 Therefore, the amount of ultraviolet rays reaching the recording head 6 is significantly reduced.
- the ultraviolet rays that enter the recording head 6 by reflection become ultraviolet rays of reduced energy and reach the nozzle surface of the recording medium 17.
- ultraviolet rays that are not incident on the recording head 6 even if reflected are radiated to the surface of the recording medium 17 with high energy. Therefore, the amount of ultraviolet light that reaches the nozzle surface by reflection can be reduced while securing a sufficient amount of ultraviolet light necessary to harden the ink that has landed on the recording medium 17, thereby reducing the viscosity of the ink. This prevents the ink from being discharged stably.
- the ultraviolet irradiation device 209 and the recording head 6 can be arranged close to each other, and the ink jet printer can be downsized. It is possible.
- the ultraviolet absorbing member 219 is provided on all of the vertical surface on the recording head side of the partition member 21 and the separated vertical surface of the cover member 216.
- the cover member 2 16 has a box-like shape that opens toward the recording medium 17 side, but is not limited to this. As in the case of the device 309, an arched shape that opens toward the recording medium 17 may be used.
- the partition member 321 has the same height as the portion of the cover member 316 perpendicular to the recording medium 17.
- the reflecting member 318 is provided on the inner surface of the cover member 316 and the surface of the partition member 321 and the cover member 316 is separated.
- An ultraviolet absorbing member 319 may be provided so as to cover the reflecting member 318 on the inner surface of the separated vertical surface and the surface of the partition member 321 on the recording head 6 side.
- FIG. 9A a third embodiment of the ink jet printer according to the present invention will be described with reference to FIG. 9A, FIG. 9B and FIG.
- the components denoted by the same reference numerals as those in the first embodiment are the same as those in the first embodiment, and thus description thereof will be omitted.
- the ink jet printer according to the third embodiment is a line head type ink jet printer, and a flat support member 22 is fixed at a predetermined position in a printer main body (not shown).
- the member 22 has a nozzle that discharges ink of each color of yellow (Y), magenta ( ⁇ ), cyan (C), and black (K).
- the recording head 6 is formed. These recording heads 6 have a length covering substantially the entire width of the recording medium 17 and are provided so as to be orthogonal to the transport direction Z of the recording medium 17.
- an ultraviolet irradiation device 9 for irradiating the ink ejected from the nozzle 5 to the recording medium 17 with ultraviolet light is provided.
- the ultraviolet irradiation device 9 includes an ultraviolet light source 15 and a cover member 16 that covers the ultraviolet light source 15.
- a reflection member 18 that reflects ultraviolet light is provided on the entire inner surface of the cover member 16.
- an ultraviolet absorbing member 19 is provided on the inner surface of the separated vertical surface of the cover member 16. Since the ultraviolet irradiation device 9 has the same configuration as the ultraviolet irradiation device 9 in the ultraviolet irradiation device 9 in the first embodiment, detailed description will be omitted.
- a platen (not shown) made of a plate-like member and supporting the recording medium 17 from the non-recording surface.
- a transport mechanism (not shown) for transporting the recording medium 17 to the platen and unloading the recording medium 17 on which an image is formed on the platen from the platen is provided.
- the transport mechanism operates to transport the recording medium 17, and ink of a predetermined color is ejected from the nozzles 5 of the recording head 6 mounted on the support member 22 based on predetermined image information. .
- the ejected ink lands on the recording medium 17 sequentially.
- the ink that has landed on the recording medium 17 is sequentially irradiated with ultraviolet light by an ultraviolet light source 15 constituting an ultraviolet irradiation device 9 provided on the support member 22, and the ink is cured on the recording medium 17. .
- an image is formed on the recording medium 17 as the recording medium 17 is transported by the transport mechanism.
- the ultraviolet light emitted to the ultraviolet absorbing member 19 is absorbed by the ultraviolet absorbing member 19 and becomes ultraviolet light of reduced energy, The light is reflected by the reflecting member 18 provided below the ultraviolet absorbing member 19 and is irradiated on the surface of the recording medium 17. Thereafter, the ultraviolet rays having the reduced energy are absorbed and reflected on the surface of the recording medium 17, become ultraviolet rays having a lower energy, and are emitted to the nozzle surface of the recording medium 17.
- the ultraviolet light emitted from the ultraviolet light source 15 the ultraviolet light emitted to the reflecting member is reflected at the ultraviolet reflectance of the reflecting member 18, and the recording medium 17 has a lower energy. The surface is irradiated. After that, the high-energy ultraviolet rays are absorbed and reflected on the surface of the recording medium 17, but are not reflected on the surface of the recording head 6, and thus do not reach the nozzle surface.
- the ultraviolet light incident on the recording head 6 by reflection becomes low energy ultraviolet light and reaches the nozzle surface of the recording medium 17.
- ultraviolet rays which are not incident on the recording head 6 even when reflected are radiated to the surface of the recording medium 17 with high energy. Therefore, it is possible to reduce the ultraviolet dose reaching the nozzle surface by reflection while securing the necessary and sufficient amount of ultraviolet light to cure the ink that has landed on the recording medium 17, and to reduce the viscosity of the ink. It is possible to discharge the ink stably by preventing the discharge.
- the ultraviolet irradiation device 9 and the recording head 6 can be arranged close to each other, and the inkjet printer can be downsized. is there. [Fourth embodiment]
- FIG. 11 a fourth embodiment according to the present invention will be described with reference to FIG. 11, FIG. 12A and FIG. 12B.
- the parts other than the parts specific to this embodiment are the same as those of the above-described embodiment. I do.
- FIG. 11 is a diagram schematically showing reflection of ultraviolet light emitted from the ultraviolet light source 15 provided in the ultraviolet irradiation device 409.
- FIG. 12A is a diagram showing a cross-sectional portion along the longitudinal direction of an ultraviolet irradiation device 809 having no ultraviolet absorbing member 419 on the inner surface of the orthogonal plane portion 2 23.
- FIG. 2B is a diagram schematically showing the reflection of ultraviolet rays in the ultraviolet irradiation device 809.
- the inside of the orthogonal surface portion 223 Ultraviolet light is reflected at the ultraviolet reflectance of the reflecting member 418 provided on the surface.
- the orthogonal surface portion 223 12A can be reduced as compared with those shown in FIGS. 12A and 12B.
- the UV reflectance of the inner surface of each of the upper surface portion 211 and the curved surface portions 222, 222 is higher than the UV reflectance of the inner surface of the orthogonal surface portions 222, 222. It is now. Therefore, as shown in Fig. 11, the amount of reduction in the amount of ultraviolet light reflected on the inner surface of the upper surface portion 211 and the inner surface of the curved surface portion 222, 222 is smaller than that of the orthogonal surface portion 222, 223. Is smaller than the amount of UV light reflected on the recording surface, The radiation amount can be suitably secured.
- the reflection member 418 and the recording medium 17 disposed on the inner surface of the cover member 416 correspond to the reflection member 418 and the recording medium in FIG. It is assumed that the medium has the same ultraviolet reflectance as that of the medium 17.
- the line width of the arrow U is schematically represented as the amount of ultraviolet rays, and the larger the line width, the greater the amount of ultraviolet rays.
- the ultraviolet light reflected on the inner surface of the orthogonal plane portion 23 and incident on the nozzle surface 62 is the ultraviolet light arranged at the right end along the main scanning direction X.
- the ultraviolet light (arrow U) emitted from the fourth ultraviolet light source 15 to the left from the light source 15 is illustrated.
- An optical trap 10 is provided between the ultraviolet irradiation device 409 and the recording head 6 adjacent to each of the ultraviolet irradiation devices 409.
- the inkjet printer of the fourth embodiment it is easy to pass between the recording surface and the lower end of the orthogonal surface portion 223, and the amount of ultraviolet light reflected on the orthogonal surface portion 223 is reduced. Therefore, the amount of ultraviolet rays emitted from the ultraviolet irradiation device 409 to the lower surface of the recording head 6, particularly, the nose surface 62 can be reduced.
- the amount of ultraviolet light incident on the orthogonal plane part 23 is also increased. With the provision of 19, it is possible to absorb ultraviolet light incident on the orthogonal plane portion 2 23 and effectively reduce the amount of ultraviolet light reflected toward the recording surface. Further, the light trap 10 irradiates the ultraviolet light from the ultraviolet irradiation device 409 and reflects the ultraviolet light reflected from the recording surface to the recording head 6 side. The amount of ultraviolet light reflected by the frame (not shown) for fixing the 409 to the carriage 4 and reflected toward the recording head 6 can be reduced. The amount of incident ultraviolet light can be reduced.
- the ink is prevented from viscous hardening, and the nozzle is ejected. Defects can be made less likely to occur.
- the ultraviolet reflectance of the orthogonal surface portion 2 By making the UV reflectance lower than the UV reflectance of the upper surface portion 222, it is possible to reduce the amount of UV light incident on the nose surface 62 of the recording head 6, and the nozzle surface 62 and its discharge It is possible to prevent the cationically curable ink at the outlet from being thickened or cured.
- the ultraviolet light source 15 is any one of a high-pressure mercury lamp, a metal halide lamp, a hot cathode tube, a cold cathode tube, and an LED
- the surface of the ultraviolet light emitted from the ultraviolet irradiation device 409 is also used. It is possible to reliably reduce the amount of incident light to 62.
- the reflecting member 418 since the reflecting member 418 is provided on the curved surface portions 222, 222 and the upper surface portion 221 so that the reflecting member 418 is exposed, the reflecting member 418 effectively applies ultraviolet light to the recording surface. Can be reflected toward That is, by providing the reflecting member 418, the amount of ultraviolet irradiation from the ultraviolet irradiation device 409 can be increased without increasing the number of ultraviolet light sources 15 provided in the ultraviolet irradiation device 409. The amount can be a predetermined amount necessary for ink curing.
- the ultraviolet light reflected on the inner surface of the orthogonal surface portion 223 is incident on the recording surface (the incident angle (recording surface)).
- the ultraviolet irradiation device 409 is provided on both of the recording units.
- the present invention is not limited to this.
- An ultraviolet irradiation device 409 may be provided between one (Y) recording head 6 and the black (K) recording head 6 of the left recording unit.
- each recording unit one ultraviolet irradiation device 409 is provided for each of the four recording heads 6,..., but the present invention is not limited to this.
- the number and arrangement position of the ultraviolet irradiation devices 409 are arbitrary as long as they are arranged at least downstream of the recording head 6 in the main scanning direction X.
- one ultraviolet irradiation device 409 may be provided for one recording head 6, or one ultraviolet irradiation device 409 may be provided for two recording heads 6 and 6 arranged adjacent to each other.
- An ultraviolet irradiation device 409 may be provided, or one ultraviolet irradiation device 409 may be provided for three recording heads 6 arranged continuously.
- the ultraviolet irradiation apparatus according to the fifth embodiment is the same as the above-described embodiment except for the parts unique to this embodiment. Therefore, the same parts as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Omitted.
- FIG. 13A is a perspective view schematically showing the ultraviolet irradiation device 509
- FIG. 13B is a cross-sectional view showing an EE portion of FIG. 13A
- FIG. 14 is a diagram schematically showing reflection of ultraviolet light emitted from the ultraviolet light source 15 of the ultraviolet irradiation device 509.
- the ultraviolet irradiation device 509 of the fifth embodiment includes a first and a second middle orthogonal plane portion 2 disposed between the ultraviolet light sources 15 and 15.
- a cover member 5 16 having 24, 25 is provided.
- the cover member 5 16 is formed substantially perpendicular to the recording surface at a position where the distance between the two orthogonal plane portions 2 2 3 and 2 2 3 of the inner surface of the upper surface portion 2 21 is approximately equal to three.
- the first First and second connecting portions 2 connecting the first and second middle orthogonal surfaces 2 2 4 and 2 25 to the first and second middle orthogonal surfaces 2 2 4 and 2 25 and the upper surface 2 2 1 inner surface. 2 6 and 2 2 7 are provided.
- Two ultraviolet light sources 15 arranged in the main scanning direction X are provided between the two ultraviolet light sources 15 and 22.
- first and second middle orthogonal plane portions 224 and 225 are arranged between the regions where the plurality of ultraviolet light sources 15 are arranged.
- the height of the lower end of the first and second middle orthogonal plane portions 224, 225 is substantially equal to the height of the lower end of the orthogonal surface portions 223, 223.
- first and second connecting portions 2 26 and 2 27 have an upper surface 2 2 larger than the width in the main scanning direction X of the portion connected to the first and second middle orthogonal surfaces 2 2 4 and 2 25.
- the portion connected to 1 is curved so that the width in the main scanning direction X becomes gradually larger.
- the inner surfaces of the first and second connecting portions 226 and 227 have substantially the same shape as the inner surfaces of the curved portions 222 and 222.
- first and second connection portions 226 and 227 constitute a facing surface portion having at least a region facing the recording surface.
- the member 5 18 a is disposed, and the first middle orthogonal surface portion 2 2 4, the first connection portion 2 2 6, the upper surface portion 2 21, the second connection portion 2 2 7, and the second middle orthogonal surface portion 2 2
- the second reflecting member 5 18 b is disposed along the inner surface formed so as to be continuous by 5, and further, the second middle orthogonal surface portion 2 25, the second connecting portion 2 27, and the upper surface portion 2 2 1
- a third reflecting member 518c is provided along an inner surface formed to be continuous by the curved surface portion 222 and the orthogonal surface portion 222.
- An ultraviolet absorbing member 519 is provided along the inner surface so as to cover the first to third reflecting members 518a to 518c. Therefore, as shown in FIG. 14, ultraviolet light incident on the inner surfaces of the two orthogonal plane portions 2 23, 2 23 and the first and second middle orthogonal surface portions 2 24, 25 The amount of ultraviolet light that is absorbed and reflected by the ultraviolet absorbing member 519 disposed through the first to third reflecting members 518a to 518c on the inside is reduced.
- the inner surface of the orthogonal plane portions 2 2 3 and 2 2 3 and the first and second middle orthogonal surface portions 2 2 4 and 2 25 Ultraviolet reflectance, UV on the inner surface of the curved surface 2 2 2, 2 2 2, top surface 2 2 1, 1st and 2nd connection 2 2 6, 2 27! ⁇ ⁇ ⁇ Lower than the reflectance Therefore, it is possible to reduce the incident amount of the ultraviolet light irradiated from the ultraviolet irradiation device 509 to the nozzle surface 62.
- the orthogonal plane portions 2 2 3 (second The angle of incidence on the inner surface (hereinafter referred to as the “inner surface”) of the first and second middle orthogonal plane portions 2 2 4 and 2 25 (including the line segment L 2 orthogonal to the orthogonal plane portion 2 23)
- the angle of incidence R1 on the recording surface can be reduced by increasing R2. That is, the incident angle R1 of the ultraviolet light reflected on the inner surface of the orthogonal surface portion 2 23 to the recording surface is defined by the reflection angle R3 of the ultraviolet light on the inner surface, and the reflection angle R3 is It is defined by the angle of incidence R 2 on the inner surface.
- the recording head 6 can easily pass through the space between the lower end of the orthogonal plane portion 223 and the nozzle surface 62 of the recording head 6.
- the first and second middle orthogonal plane portions 2 2 4 and 2 25 are arranged so as to divide the ultraviolet light sources 15,. Therefore, it is possible to shorten the distance of the ultraviolet light source 15 with respect to the orthogonal plane portion 2 23 and to increase the incident angle R 2 of the ultraviolet light emitted from the ultraviolet light source 15 on the inner surface of the orthogonal plane portion 2 23. .
- the angle of incidence R1 on the recording surface of the ultraviolet light reflected on the inner side surface of the middle orthogonal plane portion 2 23 can be reduced, so that the light passes between the recording surface and the lower end of the orthogonal plane portion 2 23.
- the amount of ultraviolet light that escapes can be reduced, and the amount of ultraviolet light incident on the nozzle surface 62 can be reduced.
- the ultraviolet irradiation device 509 and the recording head 6 can be arranged closer to each other, which can contribute to downsizing of the ink jet printer.
- FIG. 14 the reflection of the ultraviolet rays (arrow U) emitted from the ultraviolet light source 15 disposed closest to the recording head 6 on the inner side surface of the first middle orthogonal plane portion 222 is illustrated. ing.
- FIGS. 15A and 15B Next, a sixth embodiment according to the present invention will be described with reference to FIGS. 15A and 15B.
- FIG. 15A is a perspective view schematically showing an ultraviolet irradiation device 609 of the ink jet printer according to the sixth embodiment
- FIG. 15B is a FF section of FIG. 15A. It is sectional drawing which showed the minute.
- the ultraviolet irradiation device 609 of the sixth embodiment at least one set of ultraviolet light sources 15 among the ultraviolet light sources 15 arranged adjacent to each other is used.
- the linear light sources 15 and 15 are arranged inside the cover member 616 so that the distances to the recording surface are different.
- the cover member 6 16 is formed in an arch shape that opens toward the recording medium 17, and the cover member 6 16 is formed on the orthogonal plane portions 2 2 3 and 2 2 3. It is disposed at a position that divides the distance between the arc-shaped portion 2 238 curved so as to draw a substantially semicircle from the end toward the inside and the two orthogonal surface portions 2 2 3, 2 3 approximately 3 equally, There are third and fourth middle orthogonal surfaces 229 and 220 formed substantially orthogonal to the recording surface.
- the arc-shaped portion 228 constitutes a facing surface portion having at least a region facing the recording surface.
- both ends along the longitudinal direction of the third and fourth middle orthogonal plane portions 229 and 220 are provided at both ends along the longitudinal direction (the same direction as the sub-scanning direction) of the cover member 616. Are fixed to the attached face plates 22a and 22b.
- a reflecting member 618 is provided.
- a plurality of ultraviolet light sources 15,... are arranged along the inner surface of the reflecting member 618 arranged in the arc-shaped portion 228. Accordingly, the central axis of one adjacent ultraviolet light source 15 and the central axis of another ultraviolet light source 15 are closer to each other along the main scanning direction X.
- the incident amount of the ultraviolet light emitted from the ultraviolet irradiation device 609 to the nozzle surface 62 is reduced. be able to.
- FIG. 16 is a diagram schematically showing the head unit 700 provided in the ink jet printer of the seventh embodiment when viewed from the side.
- the ink jet printer of the seventh embodiment is the same as the above-described embodiment and the ultraviolet irradiation device except for the parts that are unique to this embodiment. Description is omitted.
- the ink jet printer according to the seventh embodiment includes a line head 706 extending in the width direction of the recording medium 17 (a direction orthogonal to the conveying direction Z of the recording medium 17), and is used for conveying the recording medium 17.
- the image is recorded by a line method for forming an image based on the image.
- each of the line heads 706 is disposed in the head portion 704 along the transport direction Z of the recording medium 17 so that the longitudinal directions thereof are parallel to each other.
- each of the ultraviolet irradiation devices 709 is disposed in the head portion 700 so as to be located downstream of the corresponding line head 706 in the transport direction Z of the recording medium 1 ⁇ . Have been.
- the ultraviolet irradiation device 709 is a member substantially equivalent to the ultraviolet irradiation device 409 exemplified in the fourth embodiment. That is, the ultraviolet absorbing member 419 is disposed on the inner surface of the orthogonal surface portions 222, 223 of the cover member 416 via the reflecting member 418, whereby the ultraviolet absorbing member 419 is provided. , The UV reflectance of the inner surface of the orthogonal surface portions 2 2 3 and 2 23 is lower than the UV reflectance of the inner surface of the curved surface portions 2 2, 2 2 2 and the upper surface portion 2 21 .
- the length of the ultraviolet irradiation device 709 along the same direction as the length direction of the line head 706 is longer than at least the length of the row of line heads 706.
- Each of the reflection members 418 may be made of a material having the following. Whether or not a reflection member is provided on the inner surface of the cover member 416 is optional. For example, the reflection member 418 is not provided on the orthogonal surface portion 223, and the ultraviolet reflection of the orthogonal surface portion 223 itself is not performed. A reflecting member having a higher ultraviolet reflectance than the reflectance may be provided on the facing surface. Furthermore, for example, without providing the reflecting member 418 on the facing surface portion, an ultraviolet absorbing member having a lower ultraviolet reflectance (higher ultraviolet absorbing ratio) than the facing surface portion itself is provided on the orthogonal surface portion 223. You may do it.
- the cover member may be made of a material having a high ultraviolet reflectance, and the orthogonal surface portion 223 may be provided with the ultraviolet absorbing member 419. , Of course.
- the ultraviolet absorbing members 51 9 are provided on both surfaces along the main running direction X (or the transport direction Z in the case of the line head type inkjet printer) of the middle orthogonal plane portions 224, 225, 229, 220. , 619b, 619c (419), but is not limited to this.
- at least the surface of the middle orthogonal plane portions 224, 225, 229, and 220 facing the recording head 6 has an ultraviolet absorbing member. Should be provided.
- a high-purity aluminum reflection plate that efficiently reflects ultraviolet rays in the entire wavelength range is applied, preferably, A cold mirror (glass molded plate) in which a thin film of a metal compound containing mainly aluminum is deposited on the glass surface is applied.
- the cold mirror efficiently reflects ultraviolet rays, while transmitting visible light and infrared rays that do not contribute to curing of the ink to the rear of the mirror, thereby suppressing a decrease in luminous efficiency due to heat generation of the light source.
- each recording head 6 or line heads 706 are provided so as to correspond to four color inks.
- the present invention is not limited to this, and the recording head 6 and the line head 706 are provided.
- the number of 706 is arbitrary.
- the end of the ultraviolet light source 15 corresponding to the downstream side in the transport direction of the recording medium 17 (the same direction as the sub-scanning direction Y) is located at the end of the nozzle row in the transport direction. It is preferable that the recording medium 17 be located sufficiently downstream along the transport direction of the recording medium 17 with respect to the end corresponding to the downstream side.
- the portion of the light source 15 on the downstream side in the transport direction passes therethrough, and the ultraviolet light emitted from the ultraviolet light source 15 enters the ink in the first predetermined area. This makes it possible to apply irradiation energy sufficient to cure the ink to the ink in the first predetermined area.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/537,712 US7370955B2 (en) | 2002-12-13 | 2003-12-12 | Inkjet printer |
EP03778901A EP1579995B1 (en) | 2002-12-13 | 2003-12-12 | Inkjet printer |
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Application Number | Priority Date | Filing Date | Title |
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JP2002-362760 | 2002-12-13 | ||
JP2002362760A JP3864903B2 (ja) | 2002-12-13 | 2002-12-13 | インクジェットプリンタ |
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WO2004054810A1 true WO2004054810A1 (ja) | 2004-07-01 |
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PCT/JP2003/015979 WO2004054810A1 (ja) | 2002-12-13 | 2003-12-12 | インクジェットプリンタ |
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US (1) | US7370955B2 (ja) |
EP (1) | EP1579995B1 (ja) |
JP (1) | JP3864903B2 (ja) |
WO (1) | WO2004054810A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1498274A1 (en) * | 2003-07-15 | 2005-01-19 | Konica Minolta Medical & Graphic Inc. | Inkjet printer using ultraviolet cure ink |
DE102013217659A1 (de) * | 2013-09-04 | 2015-03-05 | Krones Ag | Behälterbehandlungsmaschine zur Bedruckung von Behältern |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4028525B2 (ja) | 2004-06-25 | 2007-12-26 | 日本航空電子工業株式会社 | コネクタ |
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Also Published As
Publication number | Publication date |
---|---|
EP1579995B1 (en) | 2012-02-29 |
JP2004188923A (ja) | 2004-07-08 |
EP1579995A1 (en) | 2005-09-28 |
JP3864903B2 (ja) | 2007-01-10 |
US20060023045A1 (en) | 2006-02-02 |
EP1579995A4 (en) | 2009-08-05 |
US7370955B2 (en) | 2008-05-13 |
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