EP4669031A1 - Lamp for heating and light source unit - Google Patents

Lamp for heating and light source unit

Info

Publication number
EP4669031A1
EP4669031A1 EP24871476.8A EP24871476A EP4669031A1 EP 4669031 A1 EP4669031 A1 EP 4669031A1 EP 24871476 A EP24871476 A EP 24871476A EP 4669031 A1 EP4669031 A1 EP 4669031A1
Authority
EP
European Patent Office
Prior art keywords
light
coating layer
tube body
lamp
heating
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.)
Pending
Application number
EP24871476.8A
Other languages
German (de)
French (fr)
Inventor
Hitoshi Nakabayashi
Tadakazu Kawamura
Yoshihiro Kanahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ushio Denki KK
Original Assignee
Ushio Denki KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ushio Denki KK filed Critical Ushio Denki KK
Publication of EP4669031A1 publication Critical patent/EP4669031A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
    • 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
    • B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves

Definitions

  • the present invention relates to a lamp for heating and a light source unit, and in particular, a lamp for heating and a light source unit that emit light for drying ink that has been applied to a workpiece.
  • a method for irradiating the ink with light for heating (hereinafter referred to as "heating light") that is emitted from a lamp has been employed.
  • a method for drying ink by irradiating a workpiece with light is a method performed in a non-contact manner, and has advantages such as no possibility of staining a workpiece or easy control of attained temperature or a temperature rising rate in comparison with a method for disposing a heat source in the vicinity of a workpiece.
  • a halogen lamp in which a filament is housed in a tube body having a straight tube shape is known.
  • a halogen lamp in which a filament is housed in a tube body having a straight tube shape is known.
  • half of light to be emitted is emitted toward a side opposite to a workpiece, and therefore, in many cases, a reflective film that reflects, toward the workpiece, the light emitted toward the side opposite to the workpiece is formed.
  • Patent Document 1 below discloses a halogen lamp in which a reflective film is formed on an outer surface of a tube body in order to improve the efficiency of power for lighting.
  • Patent Document 1 JP-A-2008-078065
  • the present inventors have earnestly considered a method for irradiating a surface of a workpiece with heating light to dry applied ink, and have found that there are the following problems.
  • the intensity peak of the intensity spectrum of light emitted from a halogen lamp is approximately near a wavelength of 1 ⁇ m, although there is some variation depending on the type, concentration, or the like of halogen gas sealed in a tube body as a light-emitting gas (see Fig. 9 ).
  • a wavelength band in which an absorption rate is relatively high is different from a wavelength band in which a light intensity is relatively high in an emission spectrum of the halogen lamp.
  • the present inventors have conducted an earnest study, and have found that a wavelength band of light in which ink used for printing exhibits a relatively high absorption rate is often present on a longer wavelength side in comparison with a wavelength at which an intensity is relatively high in a spectrum of light emitted from the halogen lamp.
  • the ink is not easily heated, and it takes a long time in drying treatment.
  • the present inventors have conducted a further study, and have inferred that a situation where a wavelength band in which the absorption rate is high is different from a wavelength band in which the intensity is high can occur not only in ink used for printing but also in, for example, an organic solvent, cleaning solution for glass substrates, or the like.
  • an object of the present invention is to provide a lamp for heating and a light source unit that are capable of efficiently drying a solvent, paint, or the like that adheres to a workpiece, and prevent uneven drying from occurring.
  • a lamp for heating of the present invention includes:
  • the lamp for heating having the configuration described above can irradiate the surface of the workpiece with light having a peak wavelength in a spectrum that is closer to a peak wavelength in an absorption spectrum of a solvent than a peak wavelength of the first light.
  • the first coating layer may be a white coating layer
  • the second coating layer may be a black coating layer
  • the white coating layer exhibits a relatively high reflectance with respect to the first light.
  • the black coating layer exhibits a relatively high absorption rate with respect to the first light.
  • the lamp for heating having the configuration described above can more efficiently reflect, toward the workpiece, the first light traveling toward a side different from the workpiece, and can more efficiently generate the second light. Stated another way, the lamp for heating having the configuration described above can more efficiently dry a solvent, paint, or the like that adheres to the workpiece.
  • the first coating layer and the second coating layer may be formed from one end to another end of the main tube body in a direction along the tube axis of the main tube body.
  • the first coating layer may be provided over the entirety of the first portion, and the second coating layer may be provided over the entirety of the second portion.
  • a periodic pattern may be formed in a direction along the tube axis of the main tube body in at least part of the second portion.
  • the lamp for heating is disposed to have a tube axis that is orthogonal to a conveying direction of the workpiece with respect to a plane parallel to a surface of the workpiece in such a way that the surface of the workpiece can be uniformly irradiated with light. Therefore, by employing the configuration described above, the first light and the second light that are emitted from the lamp for heating have relatively uniform illuminance in a direction along the tube axis. Stated another way, the lamp for heating having the configuration described above can irradiate the entirety of the workpiece with the first light and the second light that have more uniform illuminance.
  • an actual second coating layer does not absorb all of the first light, but slightly transmits the first light.
  • the transmittance of the second coating layer with respect to the first light can be controlled according to the thickness of the second coating layer to be formed. Accordingly, even in a case where the second coating layer is provided over the entirety of the second portion and the second portion is disposed on a side of the workpiece, the surface of the workpiece is irradiated with the first light and the second light.
  • the lamp for heating may further include:
  • the third coating layer may be a white coating layer.
  • the lamp for heating may further include:
  • the lamp for heating may further include a third coating layer that reflects part of the third light emitted from the main light emitter, and transmits another part of the third light, the third coating layer being provided in at least part of a third portion of the wall surface of the auxiliary tube body, the third portion corresponding to a position of the first portion relative to the tube axis of the main tube body.
  • the lamp for heating having the configuration described above can control the spectrum of light to be applied to a solvent that adheres to the surface of the workpiece, by adjusting the intensity spectrum of each of the third light and the fourth light in addition to the first light and the second light applied to the surface of the workpiece.
  • a light source unit of the present invention includes:
  • the light source unit having the configuration described above can reflect, toward the workpiece, the first light transmitted through the first coating layer and traveling to a side opposite to the workpiece. In other words, a solvent that adheres to the surface of the workpiece can be dried more efficiently. Note that this functional effect is similarly applied to the third light transmitted through the third coating layer.
  • the present invention achieves a lamp for heating and a light source unit that are capable of efficiently drying a solvent, paint, or the like that adheres to a workpiece, and prevent uneven drying from occurring.
  • Fig. 1 is a general perspective view schematically illustrating an embodiment of a light irradiation device 1.
  • the light irradiation device 1 includes a light source unit 10 and a base 3.
  • a plane parallel to an irradiation surface 2a that is irradiated with light of a workpiece 2 is an XY plane, and a direction that is orthogonal to the XY plane is a Z direction, as illustrated in Fig. 1 .
  • a direction in which the workpiece 2 is conveyed is a Y direction, and a direction that is orthogonal to the Y direction is an X direction (a first direction).
  • the light irradiation device 1 irradiates, with heating light (L1, L2), the irradiation surface 2a including a printing region 2b that ink has been applied to of the workpiece 2 to be conveyed in the Y direction.
  • the workpiece 2 is described as a film-shaped member in which ink has been applied to the printing region 2b on the irradiation surface 2a, but an object serving as the workpiece 2 is not limited thereto.
  • Conceivable examples include printing paper, a plate material, and the like that ink has been applied to.
  • an object to be dried is not limited to ink, and conceivable examples include an organic solvent, cleaning solution, and the like.
  • the base 3 is a member that includes a support column 3a that is configured to support the light source unit 10.
  • the presence or absence of the base 3 and the configuration of the base 3 are arbitrary.
  • Fig. 2 is an A-A sectional view of the light source unit 10 of Fig. 1
  • Fig. 3 is a B-B sectional view of the light source unit 10 of Fig. 1
  • the light source unit 10 includes a cover member 11, a reflecting member 12, and a lamp for heating 20, as illustrated in Figs. 2 and 3 .
  • the cover member 11 is provided with the reflecting member 12 on a side of an inner wall surface that faces the lamp for heating 20, as illustrated in Fig. 3 .
  • the reflecting member 12 is disposed in such a way that a reflecting surface 12a reflects light that has been emitted from the lamp for heating 20 and travels toward a +Z side to cause the light to travel toward a -Z side.
  • the reflecting surface 12a of the reflecting member 12 has a curved surface shape, but the shape of the reflecting surface 12a is arbitrarily adjusted depending on how the workpiece 2 is irradiated with heating light L.
  • Fig. 4 is a view of the lamp for heating 20 when viewed from the +Z side
  • Fig. 5 is a view of the lamp for heating 20 when viewed from the -Z side
  • Fig. 6 is a view of a main tube body 21 included in the lamp for heating 20, when viewed in the Y direction
  • Fig. 7 is a view of an auxiliary tube body 31 included in the lamp for heating 20, when viewed in the Y direction
  • Fig. 8 is a view of the main tube body 21 from which a first coating layer 23 and a second coating layer 24 have been removed, when viewed in the Y direction.
  • auxiliary tube body 31 according to the present embodiment from which a third coating layer 33 and a fourth coating layer 34 have been removed has a configuration that is similar to a configuration of the main tube body 21 illustrated in Fig. 8 , and therefore in Fig. 8 , reference signs that correspond to the configuration of the auxiliary tube body 31 are also illustrated in parentheses.
  • the lamp for heating 20 includes the main tube body 21, the auxiliary tube body 31, and a pair of power supply parts (40, 40) to which power is supplied, as illustrated in Figs. 4 and 5 .
  • the lamp for heating 20 according to the present embodiment is configured in such a way that the supply of power to the pair of power supply parts (40, 40) causes light to be emitted from both the main tube body 21 and the auxiliary tube body 31, but the power supply parts may be provided individually to the main tube body 21 and the auxiliary tube body 31.
  • the main tube body 21 is a tubular tube body that is transmissive with respect to at least light belonging to a near-infrared region and extends in the X direction, and as illustrated in Fig. 8 , a filament 22 that extends along a tube axis 21c in the X direction and corresponds to a main light emitter is housed in the main tube body 21. Furthermore, halogen gas is sealed in a space in which the filament 22 of the main tube body 21 is housed.
  • Fig. 9 is a graph illustrating an example of the spectrum of first light L1 and third light L3
  • Fig. 10 is a graph illustrating an example of the spectrum of second light L2 and fourth light L4.
  • a vertical axis indicates a relative intensity in a case where a peak intensity is assumed to be 1.0
  • a horizontal axis indicates a wavelength.
  • the first coating layer 23 that reflects part of the first light L1 emitted from the filament 22 and transmits another part of the first light L1 is formed from one end 21p to another end 21q.
  • the second coating layer 24 that is irradiated with the first light L1 and generates heat to emit the second light L2 is formed from the one end 21p to the other end 21q.
  • the first coating layer 23 according to the present embodiment is a white coating layer, and specifically, a white sintered film mainly containing silica particles.
  • the first coating layer 23 is not particularly limited as long as a layer has a characteristic of reflecting part of the first light L1 and transmitting another part of the first light L1.
  • a reflectance be 30% to 80% and a transmittance be 20% to 70%, and it is more preferable that the reflectance be 50% to 80% and the transmittance be 20% to 50%.
  • the first coating layer 23 is not necessarily white as long as the first coating layer 23 has a characteristic of reflecting part of the first light L1 and transmitting another part of the first light L1, and for example, boron nitride, barium nitrate, zirconium oxide, titanium oxide, aluminum oxide, or the like can be employed in addition to the sintered film mainly containing silica particles.
  • the second coating layer 24 is a black coating layer, and specifically, a chromium-containing coating.
  • the second coating layer 24 having this configuration is irradiated with the first light L1 to generate heat, and therefore the second coating layer 24 emits the second light L2 that has a spectrum having a peak wavelength of 2.4 ⁇ m, as illustrated in Fig. 10 .
  • the second coating layer 24 is not necessarily black as long as the second coating layer 24 has a characteristic of being irradiated with the first light L1 and generating heat to emit light belonging to a wavelength band on a longer wavelength side in comparison with the peak wavelength of the first light L1, and for example, titanium, aluminum oxide, or the like can be employed in addition to the chromium-containing coating.
  • first coating layer 23 may be formed in the second portion 21b, and the second coating layer 24 may be formed in the first portion 21a.
  • the auxiliary tube body 31 is a tubular tube body that is transmissive with respect to at least light belonging to a near-infrared region and extends in the X direction, and as illustrated in Fig. 8 , a filament 32 that extends along a tube axis 31c in the X direction and corresponds to an auxiliary light emitter is housed in the auxiliary tube body 31. Furthermore, halogen gas is sealed in a space in which the filament 32 of the auxiliary tube body 31 is housed, similarly to the main tube body 21.
  • the third coating layer 33 that reflects part of the third light L3 emitted from the filament 32 and transmits another part of the third light L3 is formed from one end 31p to another end 31q.
  • a fourth portion 31b that faces the third portion 31a in the radial direction is located on the -Z side of the outer wall surface of the auxiliary tube body 31, the third coating layer 33 and the fourth coating layer 34 that is irradiated with the third light L3 and generates heat to emit the fourth light L4 are formed from the one end 31p to the other end 31q, as illustrated in Fig. 7 .
  • the third coating layer 33 is not particularly limited as long as a layer has a characteristic of reflecting part of the third light L3 and transmitting another part of the third light L3.
  • a reflectance be 30% to 80% and a transmittance be 20% to 70%, and it is preferable that the reflectance be 50% to 80% and the transmittance be 20% to 50%.
  • the fourth coating layer 34 is a black coating layer, and specifically, a chromium-containing coating.
  • the fourth coating layer 34 having this configuration is irradiated with the third light L3 to generate heat, and therefore the fourth coating layer 34 emits the fourth light L4 that has a spectrum having a peak wavelength of 2.4 ⁇ m, as illustrated in Fig. 10 .
  • the fourth coating layer 34 is not necessarily black as long as the fourth coating layer 34 has a characteristic of being irradiated with the third light L3 and generating heat to emit light belonging to a wavelength band on a longer wavelength side in comparison with the peak wavelength of the third light L3, and for example, titanium, aluminum oxide, or the like can be employed in addition to the chromium-containing coating.
  • the third coating layer 33 may be formed in the fourth portion 31b, and the fourth coating layer 34 may be formed in the third portion 31a.
  • Fig. 11 is a graph illustrating an example of a spectrum of light that has been measured in a position of irradiation with both the first light L1 and the second light L2.
  • a vertical axis indicates a relative intensity in a case where a peak intensity in the spectrum of light measured in a region of irradiation with the first light L1 and the second light L2 is assumed to be 1.0
  • a horizontal axis indicates a wavelength.
  • the spectrum of light measured in a position of irradiation with both the third light L3 and the fourth light L4 is not illustrated, but it is obvious that a wavelength at which an intensity peak appears is present between the peak wavelength of the third light L3 and the peak wavelength of the fourth light L4, similarly to Fig. 11 .
  • the spectrum of light measured in a region of irradiation with all of the first light L1, the second light L2, the third light L3, and the fourth light L4 roughly coincides with the graph indicated with a solid line in Fig. 11 .
  • the spectrum of light measured in a position of irradiation with the first light L1 and the second light L2 may be different from the spectrum of light measured in a position of irradiation with both the third light L3 and the fourth light L4.
  • the shapes of the respective coating layers (23, 24) formed in the main tube body 21 are different from the shapes of the respective coating layers (33, 34) formed in the auxiliary tube body 31, but each of the shapes is arbitrary.
  • simultaneous irradiation of the irradiation surface 2a of the workpiece 2 with the first light L1 and the second light L2 can be achieved by only using the main tube body 21, and therefore in the auxiliary tube body 31, only one of the third coating layer 33 and the fourth coating layer 34 may be formed for spectrum adjustment.
  • the wall surfaces of the main tube body 21 and the auxiliary tube body 31 may include a region where none of the coating layers (23, 24, 33, 34) is formed.
  • a periodic pattern that is formed by the second coating layer 24 and the light transmissive portion 25 may be formed in a circumferential direction of the main tube body 21.
  • both of the periodic patterns of the second coating layer 24 and the light transmissive portion 25 that are formed in the X direction and the circumferential direction of the main tube body 21 can be formed by the first coating layer 23 and the second coating layer 24.
  • the second coating layer 24 may be formed from the one end 21p to the other end 21q in part of the second portion 21b.
  • the patterns that can be employed in the main tube body 21, as illustrated in Figs. 12A to 12C can be employed similarly in the auxiliary tube body 31.
  • the third coating layer 33, the fourth coating layer 34, and a light transmissive portion 35 in the auxiliary tube body 31 may form a pattern that is the same as the pattern formed by the first coating layer 23, the second coating layer 24, and the light transmissive portion 25 in the main tube body 21, or may form a different pattern.
  • a pattern formed by each of the coating layers (23, 24, 33, 34) and the light transmissive portion (25, 35) is appropriately adjusted according to characteristics required for the heating light L (see Fig. 1 ) with which the irradiation surface 2a of the workpiece 2 is irradiated.
  • Figs. 13A to 13C are schematic views of another embodiment of the lamp for heating 20, Fig. 13A is a view when viewed from the +Z side, Fig. 13B is a view when viewed from the -Z side, and Fig. 13C is a view when viewed from the +Y side.
  • the lamp for heating 20 may be a light source that only includes the main tube body 21, as illustrated in Figs. 13A to 13C .
  • the light irradiation device 1 may be mounted with a plurality of lamps for heating 20 that each includes the main tube body 21 and the auxiliary tube body 31. Moreover, instead of the plurality of lamps for heating 20 that each includes the main tube body 21 and the auxiliary tube body 31, as illustrated in Fig. 3 , a plurality of lamps for heating 20 that each only includes the main tube body 21 may be mounted.
  • the shapes of the first coating layer 23 and the second coating layer 24 formed on the wall surface of the main tube body 21 may be the same as each other or may be different from each other.
  • Fig. 14A is a schematic view of another embodiment of the light source unit 10 when viewed from the -Z side
  • Fig. 14B is a sectional view of the light source unit 10 of Fig. 14A when viewed from the -Z side.
  • the light source unit 10 may be configured in such a way that a plurality of a plurality of lamps for heating 20 that each only includes the main tube body 21 is mounted, the main tube bodies 21 of the respective lamps for heating 20 are disposed to be mutually rotated about the tube axes 21c, and at least a partial region on the irradiation surface 2a of the workpiece 2 is irradiated with the first light L1 and the second light L2.
  • Figs. 14A and 14B illustrate the light source unit 10 that includes the lamps for heating 20 in which the first coating layer 23 and the second coating layer 24 are formed on the wall surface of the main tube body 21 in a similar manner, but each of the coating layers (23, 24), the lamps for heating 20 may be different in shape from each other. Moreover, as illustrated in Fig. 14B , the cover member 11 and the reflecting member 12 may be omitted from the light source unit 10.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Ink Jet (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

Provided are a lamp for heating and a light source unit that are capable of efficiently drying a solvent, paint, or the like that adheres to a workpiece, and prevent uneven drying from occurring. The lamp for heating includes: a main tube body that extends in a first direction; a main light emitter that is housed in the main tube body, and emits first light having a peak wavelength within a near-infrared region; a first coating layer that reflects part of the first light, and transmits another part of the first light, the first coating layer being provided in at least part of a first portion from among the first portion and a second portion of a tube wall of the main tube body, the first portion and the second portion facing each other in a radial direction of the main tube body with a tube axis of the main tube body interposed between the first portion and the second portion; and a second coating layer that is irradiated with the first light to emit second light having a peak wavelength that belongs to a wavelength band on a longer wavelength side in comparison with a peak wavelength of the first light, the second coating layer being provided in at least part of the second portion.

Description

    TECHNICAL FIELD
  • The present invention relates to a lamp for heating and a light source unit, and in particular, a lamp for heating and a light source unit that emit light for drying ink that has been applied to a workpiece.
    • BACKGROUND ART
  • Conventionally, as an example of a method for drying ink that has been applied to a surface of a workpiece such as an object or a film material, a method for irradiating the ink with light for heating (hereinafter referred to as "heating light") that is emitted from a lamp has been employed. A method for drying ink by irradiating a workpiece with light is a method performed in a non-contact manner, and has advantages such as no possibility of staining a workpiece or easy control of attained temperature or a temperature rising rate in comparison with a method for disposing a heat source in the vicinity of a workpiece.
  • As an example of a light source for heating, a halogen lamp in which a filament is housed in a tube body having a straight tube shape is known. In such a halogen lamp, half of light to be emitted is emitted toward a side opposite to a workpiece, and therefore, in many cases, a reflective film that reflects, toward the workpiece, the light emitted toward the side opposite to the workpiece is formed. For example, Patent Document 1 below discloses a halogen lamp in which a reflective film is formed on an outer surface of a tube body in order to improve the efficiency of power for lighting.
    • PRIOR ART DOCUMENTS PATENT DOCUMENT
  • Patent Document 1: JP-A-2008-078065
    • SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION
  • The present inventors have earnestly considered a method for irradiating a surface of a workpiece with heating light to dry applied ink, and have found that there are the following problems.
  • The intensity peak of the intensity spectrum of light emitted from a halogen lamp is approximately near a wavelength of 1 µm, although there is some variation depending on the type, concentration, or the like of halogen gas sealed in a tube body as a light-emitting gas (see Fig. 9).
  • However, in many cases, in an absorption spectrum relative to light of ink that has been applied to the workpiece, and that is irradiated with light and is heated in order to dry the ink, a wavelength band in which an absorption rate is relatively high is different from a wavelength band in which a light intensity is relatively high in an emission spectrum of the halogen lamp.
  • Here, the present inventors have conducted an earnest study, and have found that a wavelength band of light in which ink used for printing exhibits a relatively high absorption rate is often present on a longer wavelength side in comparison with a wavelength at which an intensity is relatively high in a spectrum of light emitted from the halogen lamp.
  • Therefore, in the case of using the halogen lamp as described in Patent Document 1 above, when an attempt is made to irradiate ink applied to the surface of the workpiece with heating light emitted from the halogen lamp to dry the ink, it takes a long time to sufficiently dry the ink in some cases, and uneven drying occurs depending on the type of the workpiece or the type of the applied ink in other cases. In particular, there is a possibility that the uneven drying of the ink will partially shrink the workpiece, and this will cause unintended deformation, such as wrinkles and waviness, in the workpiece, in particular, such as paper or a film.
  • Furthermore, in a case where a wavelength at which the intensity is relatively high in the spectrum of light emitted from the halogen lamp significantly deviates from a wavelength at which the absorption rate is relatively high in the absorption spectrum of the ink applied to the workpiece, the ink is not easily heated, and it takes a long time in drying treatment.
  • In addition, the present inventors have conducted a further study, and have inferred that a situation where a wavelength band in which the absorption rate is high is different from a wavelength band in which the intensity is high can occur not only in ink used for printing but also in, for example, an organic solvent, cleaning solution for glass substrates, or the like.
  • In view of the problems described above, an object of the present invention is to provide a lamp for heating and a light source unit that are capable of efficiently drying a solvent, paint, or the like that adheres to a workpiece, and prevent uneven drying from occurring.
    • MEANS FOR SOLVING THE PROBLEMS
  • A lamp for heating of the present invention includes:
    • a main tube body that extends in a first direction;
    • a main light emitter that is housed in the main tube body, and emits first light having a peak wavelength within a near-infrared region;
    • a first coating layer that reflects part of the first light, and transmits another part of the first light, the first coating layer being provided in at least part of a first portion from among the first portion and a second portion of a tube wall of the main tube body, the first portion and the second portion facing each other in a radial direction of the main tube body with a tube axis of the main tube body interposed between the first portion and the second portion; and
    • a second coating layer that is irradiated with the first light to emit second light having a peak wavelength that belongs to a wavelength band on a longer wavelength side in comparison with a peak wavelength of the first light, the second coating layer being provided in at least part of the second portion.
  • The first light is emitted in such a way that at least part of the first light travels toward a specified region, although the intensity of the first light varies in each portion depending on the shapes of the first coating layer and the second coating layer. In addition, the second light is emitted in such a way that at least part of the second light travels from the second coating layer toward a specified region irradiated with the first light. In other words, the lamp for heating having the configuration described above can simultaneously irradiate an identical region of the surface of a workpiece with the first light and the second light, by adjusting a position or an orientation of disposition of the lamp for heating.
  • Accordingly, the lamp for heating having the configuration described above can irradiate the surface of the workpiece with light in which the first light and the second light are superimposed onto each other, that is, light having a peak intensity that has substantially been shifted to a longer wavelength side in comparison with the peak intensity of the first light emitted from a halogen lamp (see Fig. 11).
  • More specifically, the lamp for heating having the configuration described above can irradiate the surface of the workpiece with light having a peak wavelength in a spectrum that is closer to a peak wavelength in an absorption spectrum of a solvent than a peak wavelength of the first light.
  • Note that the first coating layer may be formed in the second portion of the tube wall of the main tube body, and the second coating layer may be formed in the first portion of the tube wall of the main tube body.
  • In the lamp for heating, the first coating layer may be a white coating layer, and the second coating layer may be a black coating layer.
  • The white coating layer exhibits a relatively high reflectance with respect to the first light. The black coating layer exhibits a relatively high absorption rate with respect to the first light.
  • In other words, the lamp for heating having the configuration described above can more efficiently reflect, toward the workpiece, the first light traveling toward a side different from the workpiece, and can more efficiently generate the second light. Stated another way, the lamp for heating having the configuration described above can more efficiently dry a solvent, paint, or the like that adheres to the workpiece.
  • In the lamp for heating, the first coating layer and the second coating layer may be formed from one end to another end of the main tube body in a direction along the tube axis of the main tube body.
  • Moreover, in the lamp for heating, the first coating layer may be provided over the entirety of the first portion, and the second coating layer may be provided over the entirety of the second portion.
  • Furthermore, in the lamp for heating, in the second coating layer, a periodic pattern may be formed in a direction along the tube axis of the main tube body in at least part of the second portion.
  • In general, the lamp for heating is disposed to have a tube axis that is orthogonal to a conveying direction of the workpiece with respect to a plane parallel to a surface of the workpiece in such a way that the surface of the workpiece can be uniformly irradiated with light. Therefore, by employing the configuration described above, the first light and the second light that are emitted from the lamp for heating have relatively uniform illuminance in a direction along the tube axis. Stated another way, the lamp for heating having the configuration described above can irradiate the entirety of the workpiece with the first light and the second light that have more uniform illuminance.
  • Note that an actual second coating layer does not absorb all of the first light, but slightly transmits the first light. Specifically, the transmittance of the second coating layer with respect to the first light can be controlled according to the thickness of the second coating layer to be formed. Accordingly, even in a case where the second coating layer is provided over the entirety of the second portion and the second portion is disposed on a side of the workpiece, the surface of the workpiece is irradiated with the first light and the second light.
  • The lamp for heating may further include:
    • an auxiliary tube body that is disposed close to the main tube body, and extends in the first direction;
    • an auxiliary light emitter that is housed in the auxiliary tube body, and emits third light having a peak wavelength within the near-infrared region; and
    • a third coating layer that reflects part of the third light emitted from the main light emitter, and transmits another part of the third light, the third coating layer being provided in at least part of a third portion of a wall surface of the auxiliary tube body, the third portion corresponding to a position of the first portion relative to the tube axis of the main tube body.
  • Moreover, in the lamp for heating, the third coating layer may be a white coating layer.
  • Furthermore, the lamp for heating may further include:
    • an auxiliary tube body that is disposed close to the main tube body, and extends in the first direction;
    • an auxiliary light emitter that is housed in the auxiliary tube body, and emits third light having a peak wavelength within the near-infrared region; and
    • a fourth coating layer that is irradiated with the third light to emit fourth light having a peak wavelength that belongs to a wavelength band on a longer wavelength side in comparison with a peak wavelength of the third light, the fourth coating layer being provided in at least part of a fourth portion of a wall surface of the auxiliary tube body, the fourth portion corresponding to a position of the second portion relative to the tube axis of the main tube body.
  • Moreover, the lamp for heating may further include a third coating layer that reflects part of the third light emitted from the main light emitter, and transmits another part of the third light, the third coating layer being provided in at least part of a third portion of the wall surface of the auxiliary tube body, the third portion corresponding to a position of the first portion relative to the tube axis of the main tube body.
  • Moreover, in the lamp for heating, the fourth coating layer may be a black coating layer.
  • The lamp for heating having the configuration described above can control the spectrum of light to be applied to a solvent that adheres to the surface of the workpiece, by adjusting the intensity spectrum of each of the third light and the fourth light in addition to the first light and the second light applied to the surface of the workpiece.
  • A light source unit of the present invention includes:
    • the lamp for heating according to any one of claims 1 to 8; and
    • a reflecting member that is disposed on a side of the first portion of the main tube body, and reflects, toward the lamp for heating, at least part of light emitted from the first portion of the main tube body.
  • The light source unit having the configuration described above can reflect, toward the workpiece, the first light transmitted through the first coating layer and traveling to a side opposite to the workpiece. In other words, a solvent that adheres to the surface of the workpiece can be dried more efficiently. Note that this functional effect is similarly applied to the third light transmitted through the third coating layer.
    • EFFECT OF THE INVENTION
  • The present invention achieves a lamp for heating and a light source unit that are capable of efficiently drying a solvent, paint, or the like that adheres to a workpiece, and prevent uneven drying from occurring.
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • Fig. 1 is a general perspective view schematically illustrating an embodiment of a light irradiation device.
    • Fig. 2 is an A-A sectional view of the light source unit of Fig. 1.
    • Fig. 3 is a B-B sectional view of the light source unit of Fig. 1.
    • Fig. 4 is a view of a lamp for heating when viewed from a +Z side.
    • Fig. 5 is a view of the lamp for heating when viewed from a -Z side.
    • Fig. 6 is a view of a main tube body included in the lamp for heating, when viewed in a Y direction.
    • Fig. 7 is a view of an auxiliary tube body included in the lamp for heating, when viewed in the Y direction.
    • Fig. 8 is a view of the main tube body from which a first coating layer and a second coating layer have been removed, when viewed in the Y direction.
    • Fig. 9 is a graph illustrating an example of a spectrum of first light and third light.
    • Fig. 10 is a graph illustrating an example of a spectrum of second light and fourth light.
    • Fig. 11 is a graph illustrating an example of a spectrum of light that has been measured in a position of irradiation with both the first light and the second light.
    • Fig. 12A is a schematic view of another embodiment of the lamp for heating when viewed from the -Z side.
    • Fig. 12B is a schematic view of the other embodiment of the lamp for heating when viewed from the -Z side.
    • Fig. 12C is a schematic view of the other embodiment of the lamp for heating when viewed from the -Z side.
    • Fig. 13A is a schematic view of another embodiment of the lamp for heating when viewed from the +Z side.
    • Fig. 13B is a schematic view of the other embodiment of the lamp for heating when viewed from the -Z side.
    • Fig. 13C is a schematic view of the other embodiment of the lamp for heating when viewed from a +Y side.
    • Fig. 14A is a schematic view of another embodiment of the light source unit when viewed from the -Z side.
    • Fig. 14B is a sectional view of the light source unit of Fig. 14A when viewed from a -X side.
    MODE FOR CARRYING OUT THE INVENTION
  • A lamp for heating and a light source unit of the present invention will be described below with reference to the drawings. Note that all of the drawings described below relating to the lamp for heating and the light source unit are schematic illustrations, and the dimensional ratios and the numbers of parts on the drawings do not necessarily coincide with the actual dimensional ratios and the actual numbers of parts.
    • [Light irradiation device 1]
  • Fig. 1 is a general perspective view schematically illustrating an embodiment of a light irradiation device 1. As illustrated in Fig. 1, the light irradiation device 1 according to the present embodiment includes a light source unit 10 and a base 3.
  • In the description below, it is assumed that a plane parallel to an irradiation surface 2a that is irradiated with light of a workpiece 2 is an XY plane, and a direction that is orthogonal to the XY plane is a Z direction, as illustrated in Fig. 1. Furthermore, with respect to the XY plane, it is assumed that a direction in which the workpiece 2 is conveyed (a direction illustrated as an alternating long and short dashed line arrow in Fig. 1) is a Y direction, and a direction that is orthogonal to the Y direction is an X direction (a first direction).
  • In addition, in the description below as well, in a case where positive and negative directions are distinguished from each other in expressing directions, the directions are expressed with positive and negative signs added, as expressed as a "+Z direction" and a "-Z direction", and in a case where directions are expressed without distinguishing the positive and negative directions, the expression "Z direction" is simply used.
  • As illustrated in Fig. 1, the light irradiation device 1 irradiates, with heating light (L1, L2), the irradiation surface 2a including a printing region 2b that ink has been applied to of the workpiece 2 to be conveyed in the Y direction. In the description below, the workpiece 2 is described as a film-shaped member in which ink has been applied to the printing region 2b on the irradiation surface 2a, but an object serving as the workpiece 2 is not limited thereto. Conceivable examples include printing paper, a plate material, and the like that ink has been applied to. Furthermore, an object to be dried is not limited to ink, and conceivable examples include an organic solvent, cleaning solution, and the like.
  • The base 3 is a member that includes a support column 3a that is configured to support the light source unit 10. The presence or absence of the base 3 and the configuration of the base 3 are arbitrary.
    • [Light source unit 10]
  • Fig. 2 is an A-A sectional view of the light source unit 10 of Fig. 1, and Fig. 3 is a B-B sectional view of the light source unit 10 of Fig. 1. The light source unit 10 includes a cover member 11, a reflecting member 12, and a lamp for heating 20, as illustrated in Figs. 2 and 3.
  • The cover member 11 is provided with the reflecting member 12 on a side of an inner wall surface that faces the lamp for heating 20, as illustrated in Fig. 3.
  • The reflecting member 12 is disposed in such a way that a reflecting surface 12a reflects light that has been emitted from the lamp for heating 20 and travels toward a +Z side to cause the light to travel toward a -Z side.
  • In the present embodiment, as illustrated in Fig. 3, the reflecting surface 12a of the reflecting member 12 has a curved surface shape, but the shape of the reflecting surface 12a is arbitrarily adjusted depending on how the workpiece 2 is irradiated with heating light L.
    • [Lamp for heating 20]
  • Fig. 4 is a view of the lamp for heating 20 when viewed from the +Z side, and Fig. 5 is a view of the lamp for heating 20 when viewed from the -Z side. Fig. 6 is a view of a main tube body 21 included in the lamp for heating 20, when viewed in the Y direction, and Fig. 7 is a view of an auxiliary tube body 31 included in the lamp for heating 20, when viewed in the Y direction. Fig. 8 is a view of the main tube body 21 from which a first coating layer 23 and a second coating layer 24 have been removed, when viewed in the Y direction.
  • Note that the auxiliary tube body 31 according to the present embodiment from which a third coating layer 33 and a fourth coating layer 34 have been removed has a configuration that is similar to a configuration of the main tube body 21 illustrated in Fig. 8, and therefore in Fig. 8, reference signs that correspond to the configuration of the auxiliary tube body 31 are also illustrated in parentheses.
  • The lamp for heating 20 includes the main tube body 21, the auxiliary tube body 31, and a pair of power supply parts (40, 40) to which power is supplied, as illustrated in Figs. 4 and 5. The lamp for heating 20 according to the present embodiment is configured in such a way that the supply of power to the pair of power supply parts (40, 40) causes light to be emitted from both the main tube body 21 and the auxiliary tube body 31, but the power supply parts may be provided individually to the main tube body 21 and the auxiliary tube body 31.
  • The main tube body 21 is a tubular tube body that is transmissive with respect to at least light belonging to a near-infrared region and extends in the X direction, and as illustrated in Fig. 8, a filament 22 that extends along a tube axis 21c in the X direction and corresponds to a main light emitter is housed in the main tube body 21. Furthermore, halogen gas is sealed in a space in which the filament 22 of the main tube body 21 is housed.
  • Fig. 9 is a graph illustrating an example of the spectrum of first light L1 and third light L3, and Fig. 10 is a graph illustrating an example of the spectrum of second light L2 and fourth light L4. In Figs. 9 and 10, a vertical axis indicates a relative intensity in a case where a peak intensity is assumed to be 1.0, and a horizontal axis indicates a wavelength. When power has been supplied between the pair of electrodes (40, 40), the filament 22 according to the present embodiment emits the first light L1 that has a spectrum having a peak wavelength of 1.2 µm, as illustrated in Fig. 9.
  • In a first portion 21a located on the +Z side of an outer wall surface of the main tube body 21, the first coating layer 23 that reflects part of the first light L1 emitted from the filament 22 and transmits another part of the first light L1 is formed from one end 21p to another end 21q.
  • In a second portion 21b that faces the first portion 21a in a radial direction, and stated another way, is located on the -Z side of the outer wall surface of the main tube body 21, the second coating layer 24 that is irradiated with the first light L1 and generates heat to emit the second light L2 is formed from the one end 21p to the other end 21q.
  • The first coating layer 23 according to the present embodiment is a white coating layer, and specifically, a white sintered film mainly containing silica particles.
  • The first coating layer 23 is not particularly limited as long as a layer has a characteristic of reflecting part of the first light L1 and transmitting another part of the first light L1. However, from the viewpoint of heating efficiency, it is preferable that, with respect to the first light L1, a reflectance be 30% to 80% and a transmittance be 20% to 70%, and it is more preferable that the reflectance be 50% to 80% and the transmittance be 20% to 50%.
  • Note that the first coating layer 23 is not necessarily white as long as the first coating layer 23 has a characteristic of reflecting part of the first light L1 and transmitting another part of the first light L1, and for example, boron nitride, barium nitrate, zirconium oxide, titanium oxide, aluminum oxide, or the like can be employed in addition to the sintered film mainly containing silica particles.
  • The second coating layer 24 according to the present embodiment is a black coating layer, and specifically, a chromium-containing coating. The second coating layer 24 having this configuration is irradiated with the first light L1 to generate heat, and therefore the second coating layer 24 emits the second light L2 that has a spectrum having a peak wavelength of 2.4 µm, as illustrated in Fig. 10.
  • Note that the second coating layer 24 is not necessarily black as long as the second coating layer 24 has a characteristic of being irradiated with the first light L1 and generating heat to emit light belonging to a wavelength band on a longer wavelength side in comparison with the peak wavelength of the first light L1, and for example, titanium, aluminum oxide, or the like can be employed in addition to the chromium-containing coating.
  • Furthermore, the first coating layer 23 may be formed in the second portion 21b, and the second coating layer 24 may be formed in the first portion 21a.
  • The auxiliary tube body 31 is a tubular tube body that is transmissive with respect to at least light belonging to a near-infrared region and extends in the X direction, and as illustrated in Fig. 8, a filament 32 that extends along a tube axis 31c in the X direction and corresponds to an auxiliary light emitter is housed in the auxiliary tube body 31. Furthermore, halogen gas is sealed in a space in which the filament 32 of the auxiliary tube body 31 is housed, similarly to the main tube body 21.
  • In a third portion 31a located on the +Z side of an outer wall surface of the auxiliary tube body 31, the third coating layer 33 that reflects part of the third light L3 emitted from the filament 32 and transmits another part of the third light L3 is formed from one end 31p to another end 31q.
  • In a fourth portion 31b that faces the third portion 31a in the radial direction, and stated another way, is located on the -Z side of the outer wall surface of the auxiliary tube body 31, the third coating layer 33 and the fourth coating layer 34 that is irradiated with the third light L3 and generates heat to emit the fourth light L4 are formed from the one end 31p to the other end 31q, as illustrated in Fig. 7.
  • The third coating layer 33 according to the present embodiment is a white coating layer, and specifically, a white sintered film mainly containing silica particles.
  • The third coating layer 33 is not particularly limited as long as a layer has a characteristic of reflecting part of the third light L3 and transmitting another part of the third light L3. However, from the viewpoint of heating efficiency, it is preferable that, with respect to the third light L3, a reflectance be 30% to 80% and a transmittance be 20% to 70%, and it is preferable that the reflectance be 50% to 80% and the transmittance be 20% to 50%.
  • Note that the third coating layer 33 is not necessarily white as long as the third coating layer 33 has a characteristic of reflecting part of the third light L3 and transmitting another part of the third light L3, and for example, boron nitride, barium nitrate, zirconium oxide, titanium oxide, aluminum oxide, or the like can be employed in addition to the sintered film mainly containing silica particles.
  • The fourth coating layer 34 according to the present embodiment is a black coating layer, and specifically, a chromium-containing coating. The fourth coating layer 34 having this configuration is irradiated with the third light L3 to generate heat, and therefore the fourth coating layer 34 emits the fourth light L4 that has a spectrum having a peak wavelength of 2.4 µm, as illustrated in Fig. 10.
  • Note that the fourth coating layer 34 is not necessarily black as long as the fourth coating layer 34 has a characteristic of being irradiated with the third light L3 and generating heat to emit light belonging to a wavelength band on a longer wavelength side in comparison with the peak wavelength of the third light L3, and for example, titanium, aluminum oxide, or the like can be employed in addition to the chromium-containing coating.
  • Furthermore, the third coating layer 33 may be formed in the fourth portion 31b, and the fourth coating layer 34 may be formed in the third portion 31a.
  • Fig. 11 is a graph illustrating an example of a spectrum of light that has been measured in a position of irradiation with both the first light L1 and the second light L2. In Fig. 11, a vertical axis indicates a relative intensity in a case where a peak intensity in the spectrum of light measured in a region of irradiation with the first light L1 and the second light L2 is assumed to be 1.0, and a horizontal axis indicates a wavelength.
  • Note that the spectrum of light measured in a position of irradiation with both the third light L3 and the fourth light L4 is not illustrated, but it is obvious that a wavelength at which an intensity peak appears is present between the peak wavelength of the third light L3 and the peak wavelength of the fourth light L4, similarly to Fig. 11. In other words, in the present embodiment, the spectrum of light measured in a region of irradiation with all of the first light L1, the second light L2, the third light L3, and the fourth light L4 roughly coincides with the graph indicated with a solid line in Fig. 11. However, the spectrum of light measured in a position of irradiation with the first light L1 and the second light L2 may be different from the spectrum of light measured in a position of irradiation with both the third light L3 and the fourth light L4.
  • The irradiation surface 2a of the workpiece 2 is irradiated with the heating light L emitted from the light source unit 10, as illustrated in Fig. 1. As the heating light L, rays of heating light (L1, L2, L3, L4) are applied, and therefore light having a spectrum as illustrated in Fig. 11 is substantially applied.
  • As described above, the light irradiation device 1, the light source unit 10, and the lamp for heating 20 that have the configurations described above can irradiate the irradiation surface 2a of the workpiece 2 with light in which the emission spectrum of the first light L1 and the emission spectrum of the second light L2 are superimposed onto each other and a peak intensity has substantially been shifted to a longer wavelength side in comparison with the peak intensity of the first light L1, as illustrated in Fig. 11.
  • In the embodiment described above, as illustrated in Figs. 5 and 7, the shapes of the respective coating layers (23, 24) formed in the main tube body 21 are different from the shapes of the respective coating layers (33, 34) formed in the auxiliary tube body 31, but each of the shapes is arbitrary.
  • Furthermore, simultaneous irradiation of the irradiation surface 2a of the workpiece 2 with the first light L1 and the second light L2 can be achieved by only using the main tube body 21, and therefore in the auxiliary tube body 31, only one of the third coating layer 33 and the fourth coating layer 34 may be formed for spectrum adjustment.
  • Moreover, from the viewpoint of enhancing the efficiency of extracting the first light L1 and the third light L3, the viewpoint of enabling visual confirmation as to whether or not the filaments (22, 32) emit light without any problems, or the like, the wall surfaces of the main tube body 21 and the auxiliary tube body 31 may include a region where none of the coating layers (23, 24, 33, 34) is formed.
    • [Other embodiments]
  • Other embodiments will be described below.
    • <1> Figs. 12A to 12C are schematic views of another embodiment of the lamp for heating 20 when viewed from the -Z side. As illustrated in Fig. 12A, the main tube body 21 may have a periodic pattern that is formed by the second coating layer 24 and a light transmissive portion 25 in which no coating layers (23, 24) are formed, in a direction along the tube axis 21c (the X direction).
  • Furthermore, as illustrated in Fig. 12B, a periodic pattern that is formed by the second coating layer 24 and the light transmissive portion 25 may be formed in a circumferential direction of the main tube body 21.
  • Note that both of the periodic patterns of the second coating layer 24 and the light transmissive portion 25 that are formed in the X direction and the circumferential direction of the main tube body 21 can be formed by the first coating layer 23 and the second coating layer 24.
  • As illustrated in Fig. 12C, in the main tube body 21, the second coating layer 24 may be formed from the one end 21p to the other end 21q in part of the second portion 21b.
  • Here, the patterns that can be employed in the main tube body 21, as illustrated in Figs. 12A to 12C, can be employed similarly in the auxiliary tube body 31. In addition, as illustrated in Figs. 12A to 12C, the third coating layer 33, the fourth coating layer 34, and a light transmissive portion 35 in the auxiliary tube body 31 may form a pattern that is the same as the pattern formed by the first coating layer 23, the second coating layer 24, and the light transmissive portion 25 in the main tube body 21, or may form a different pattern.
  • In the main tube body 21 and the auxiliary tube body 31, a pattern formed by each of the coating layers (23, 24, 33, 34) and the light transmissive portion (25, 35) is appropriately adjusted according to characteristics required for the heating light L (see Fig. 1) with which the irradiation surface 2a of the workpiece 2 is irradiated.
  • Figs. 13A to 13C are schematic views of another embodiment of the lamp for heating 20, Fig. 13A is a view when viewed from the +Z side, Fig. 13B is a view when viewed from the -Z side, and Fig. 13C is a view when viewed from the +Y side. The lamp for heating 20 may be a light source that only includes the main tube body 21, as illustrated in Figs. 13A to 13C.
  • Furthermore, the light irradiation device 1 may be mounted with a plurality of lamps for heating 20 that each includes the main tube body 21 and the auxiliary tube body 31. Moreover, instead of the plurality of lamps for heating 20 that each includes the main tube body 21 and the auxiliary tube body 31, as illustrated in Fig. 3, a plurality of lamps for heating 20 that each only includes the main tube body 21 may be mounted.
  • In a case where the plurality of lamps for heating 20 that each only includes the main tube body 21 is mounted on the light irradiation device 1, the shapes of the first coating layer 23 and the second coating layer 24 formed on the wall surface of the main tube body 21 may be the same as each other or may be different from each other.
  • Fig. 14A is a schematic view of another embodiment of the light source unit 10 when viewed from the -Z side, and Fig. 14B is a sectional view of the light source unit 10 of Fig. 14A when viewed from the -Z side. As illustrated in Fig. 14, the light source unit 10 may be configured in such a way that a plurality of a plurality of lamps for heating 20 that each only includes the main tube body 21 is mounted, the main tube bodies 21 of the respective lamps for heating 20 are disposed to be mutually rotated about the tube axes 21c, and at least a partial region on the irradiation surface 2a of the workpiece 2 is irradiated with the first light L1 and the second light L2.
  • Note that Figs. 14A and 14B illustrate the light source unit 10 that includes the lamps for heating 20 in which the first coating layer 23 and the second coating layer 24 are formed on the wall surface of the main tube body 21 in a similar manner, but each of the coating layers (23, 24), the lamps for heating 20 may be different in shape from each other. Moreover, as illustrated in Fig. 14B, the cover member 11 and the reflecting member 12 may be omitted from the light source unit 10.
  • <2> The configurations of the light irradiation device 1, the light source unit 10, and the lamp for heating 20 that have been described above are merely examples, and the present invention is not limited to each of the illustrated configurations.
    • DESCRIPTION OF REFERENCE SIGNS
    • 1
    Light irradiation device
    2
    Workpiece
    2a
    Irradiation surface
    2b
    Printing region
    3
    Base
    3a
    Support column
    10
    Light source unit
    11
    Cover member
    12
    Reflecting member
    12a
    Reflecting surface
    20
    Lamp for heating
    21
    Main tube body
    21a
    First portion
    21b
    Second portion
    21c
    Tube axis
    21p
    One end
    21q
    Another end
    22
    Filament
    23
    First coating layer
    24
    Second coating layer
    25
    Light transmissive portion
    31
    Auxiliary tube body
    31a
    Third portion
    31b
    Fourth portion
    31c
    Tube axis
    31p
    One end
    31q
    Another end
    32
    Filament
    33
    Third coating layer
    34
    Fourth coating layer
    35
    Light transmissive portion
    L
    Heating light
    L1
    First light
    L2
    Second light
    L3
    Third light
    L4
    Fourth light

Claims (11)

  1. A lamp for heating comprising:
    a main tube body that extends in a first direction;
    a main light emitter that is housed in the main tube body, and emits first light having a peak wavelength within a near-infrared region;
    a first coating layer that reflects part of the first light, and transmits another part of the first light, the first coating layer being provided in at least part of a first portion from among the first portion and a second portion of a tube wall of the main tube body, the first portion and the second portion facing each other in a radial direction of the main tube body with a tube axis of the main tube body interposed between the first portion and the second portion; and
    a second coating layer that is irradiated with the first light to emit second light having a peak wavelength that belongs to a wavelength band on a longer wavelength side in comparison with a peak wavelength of the first light, the second coating layer being provided in at least part of the second portion.
  2. The lamp for heating according to claim 1, wherein the first coating layer is a white coating layer, and the second coating layer is a black coating layer.
  3. The lamp for heating according to claim 1, wherein the first coating layer and the second coating layer are formed from one end to another end of the main tube body in a direction along the tube axis of the main tube body.
  4. The lamp for heating according to claim 3, wherein the first coating layer is provided over an entirety of the first portion, and the second coating layer is provided over an entirety of the second portion.
  5. The lamp for heating according to claim 1, wherein in the second coating layer, a periodic pattern is formed in a direction along the tube axis of the main tube body in at least part of the second portion.
  6. The lamp for heating according to claim 1, further comprising:
    an auxiliary tube body that is disposed close to the main tube body, and extends in the first direction;
    an auxiliary light emitter that is housed in the auxiliary tube body, and emits third light having a peak wavelength within the near-infrared region; and
    a third coating layer that reflects part of the third light emitted from the main light emitter, and transmits another part of the third light, the third coating layer being provided in at least part of a third portion of a wall surface of the auxiliary tube body, the third portion corresponding to a position of the first portion relative to the tube axis of the main tube body.
  7. The lamp for heating according to claim 6, wherein the third coating layer is a white coating layer.
  8. The lamp for heating according to claim 1, further comprising:
    an auxiliary tube body that is disposed close to the main tube body, and extends in the first direction;
    an auxiliary light emitter that is housed in the auxiliary tube body, and emits third light having a peak wavelength within the near-infrared region; and
    a fourth coating layer that is irradiated with the third light to emit fourth light having a peak wavelength that belongs to a wavelength band on a longer wavelength side in comparison with a peak wavelength of the third light, the fourth coating layer being provided in at least part of a fourth portion of a wall surface of the auxiliary tube body, the fourth portion corresponding to a position of the second portion relative to the tube axis of the main tube body.
  9. The lamp for heating according to claim 8, further comprising a third coating layer that reflects part of the third light emitted from the main light emitter, and transmits another part of the third light, the third coating layer being provided in at least part of a third portion of the wall surface of the auxiliary tube body, the third portion corresponding to a position of the first portion relative to the tube axis of the main tube body.
  10. The lamp for heating according to claim 8, wherein the fourth coating layer is a black coating layer.
  11. A light source unit comprising:
    the lamp for heating according to any one of claims 1 to 10; and
    a reflecting member that is disposed on a side of the first portion of the main tube body, and reflects, toward the lamp for heating, at least part of light emitted from the first portion of the main tube body.
EP24871476.8A 2023-09-27 2024-07-23 Lamp for heating and light source unit Pending EP4669031A1 (en)

Applications Claiming Priority (2)

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JP2023165288A JP2025055875A (en) 2023-09-27 2023-09-27 Heating lamps, light source units
PCT/JP2024/026317 WO2025069674A1 (en) 2023-09-27 2024-07-23 Lamp for heating and light source unit

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EP4669031A1 true EP4669031A1 (en) 2025-12-24

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EP (1) EP4669031A1 (en)
JP (1) JP2025055875A (en)
CN (1) CN121400060A (en)
WO (1) WO2025069674A1 (en)

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