WO2017051919A1 - サーマルヘッドおよびサーマルプリンタ - Google Patents
サーマルヘッドおよびサーマルプリンタ Download PDFInfo
- Publication number
- WO2017051919A1 WO2017051919A1 PCT/JP2016/078171 JP2016078171W WO2017051919A1 WO 2017051919 A1 WO2017051919 A1 WO 2017051919A1 JP 2016078171 W JP2016078171 W JP 2016078171W WO 2017051919 A1 WO2017051919 A1 WO 2017051919A1
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- WO
- WIPO (PCT)
- Prior art keywords
- gap
- drive
- thermal head
- driving
- covering member
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/335—Structure of thermal heads
- B41J2/33505—Constructional details
- B41J2/3352—Integrated circuits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/335—Structure of thermal heads
- B41J2/33505—Constructional details
- B41J2/3351—Electrode layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/335—Structure of thermal heads
- B41J2/33505—Constructional details
- B41J2/33515—Heater layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/335—Structure of thermal heads
- B41J2/3354—Structure of thermal heads characterised by geometry
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/335—Structure of thermal heads
- B41J2/33555—Structure of thermal heads characterised by type
- B41J2/3357—Surface type resistors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
- B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
- B41J2/345—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads characterised by the arrangement of resistors or conductors
Definitions
- the present invention relates to a thermal head and a thermal printer.
- thermal heads have been proposed as printing devices such as facsimiles or video printers.
- a thermal head including a substrate, a heat generating unit provided on the substrate, a drive IC provided on the substrate for controlling driving of the heat generating unit, and a covering member that covers the plurality of drive ICs is known. (See Patent Document 1).
- a thermal head includes a substrate, a heat generating unit provided on the substrate, a plurality of driving ICs provided on the substrate for controlling driving of the heat generating unit, and a plurality of the driving ICs.
- a covering member for covering is provided.
- the covering member includes a first part extending vertically between the drive ICs provided between the adjacent drive ICs, a second part provided below the drive ICs, and an upper part of the drive ICs. And a third portion provided in the. The first portion has a first gap.
- a thermal printer includes the thermal head described above, a transport mechanism that transports a recording medium onto the heat generating portion, and a platen roller that presses the recording medium onto the heat generating portion.
- FIG. 3 is a sectional view taken along line III-III shown in FIG. 2.
- FIGS. 2A and 2B show the thermal head shown in FIG. 1, wherein FIG. 4A is a schematic plan view, and FIG. 4B is a sectional view taken along line IVb-IVb shown in FIG. 1 is a schematic diagram illustrating a thermal printer according to a first embodiment.
- FIG. 7 shows a thermal head according to a second embodiment, where (a) is a schematic plan view and (b) is a sectional view taken along line VIb-VIb shown in FIG. 6 (a).
- FIG. 1 schematically shows the configuration of the thermal head X1.
- FIG. 2 shows the protective layer 25, the covering layer 27, and the sealing member 12 with a one-dot chain line.
- FIG. 4A shows only the drive IC 11 and the covering member 29 among the members provided on the substrate 7.
- the thermal head X ⁇ b> 1 includes a head base 3, a connector 31, a sealing member 12, a heat radiating plate 1, and an adhesive layer 14.
- the head substrate 3 is placed on the heat radiating plate 1 via the adhesive layer 14.
- the head base 3 is configured by providing a heat generating portion 9 on a substrate 7 and heats the heat generating portion 9 when an external voltage is applied to print on a recording medium (not shown).
- the connector 31 electrically connects the outside and the head base 3.
- the sealing member 12 joins the connector 31 and the head base 3.
- the heat radiating plate 1 is provided to radiate the heat of the head base 3.
- the adhesive layer 14 bonds the head base 3 and the heat sink 1.
- the heat sink 1 has a rectangular parallelepiped shape, and a substrate 7 is placed on the heat sink 1.
- the heat sink 1 is made of a metal material such as copper, iron, or aluminum, for example.
- the heat radiating plate 1 radiates heat that does not contribute to printing out of heat generated in the heat generating portion 9 of the head base 3.
- the head base 3 is formed in a rectangular shape in plan view.
- the head base 3 is provided with each member constituting the thermal head X1 on the substrate 7.
- the head base 3 performs printing on a recording medium (not shown) according to an electric signal supplied from the outside.
- the substrate 7 is disposed on the heat sink 1 and has a rectangular shape in plan view. Therefore, the substrate 7 has one long side 7a, the other long side 7b, one short side 7c, and the other short side 7d.
- the substrate 7 is formed of, for example, an electrically insulating material such as alumina ceramic or a semiconductor material such as single crystal silicon.
- a heat storage layer 13 is provided on the substrate 7.
- the heat storage layer 13 protrudes upward from the substrate 7.
- the heat storage layer 13 extends in a strip shape along the arrangement direction of the plurality of heat generating portions 9 and has a substantially semi-elliptical cross section.
- the heat storage layer 13 is provided with a height of 15 to 90 ⁇ m from the substrate 7, for example.
- the heat storage layer 13 is made of glass having low thermal conductivity, and temporarily stores part of the heat generated in the heat generating portion 9. Therefore, the thermal head X1 shortens the time required to raise the temperature of the heat generating part 9, and the thermal response is improved.
- the heat storage layer 13 is formed, for example, by applying a predetermined glass paste to the upper surface of the substrate 7 by screen printing or the like known in the art, and baking it.
- the electrical resistance layer 15 is provided on the upper surface of the substrate 7 and the upper surface of the heat storage layer 13. On the electrical resistance layer 15, various electrodes constituting the head substrate 3 are provided. The electric resistance layer 15 is patterned in the same shape as various electrodes constituting the head base 3, and the electric resistance layer 15 is exposed from the common electrode 17 and the individual electrode 19 between the common electrode 17 and the individual electrode 19. It has an exposed area. Each exposed region constitutes a heat generating portion 9 and is arranged in a row on the heat storage layer 13.
- the plurality of heat generating portions 9 are illustrated in a simplified manner in FIG. 2, but are arranged with a density of 100 dpi to 2400 dpi (dot per inch), for example.
- the electric resistance layer 15 is made of a material having a relatively high electric resistance, such as TaN, TaSiO, TaSiNO, TiSiO, TiSiCO, or NbSiO. Therefore, when a voltage is applied to the heat generating portion 9, the heat generating portion 9 generates heat due to Joule heat generation.
- the common electrode 17 electrically connects the plurality of heat generating portions 9 and the connector 31.
- the common electrode 17 includes main wiring portions 17a and 17d, a sub wiring portion 17b, and a lead portion 17c.
- the main wiring portion 17 a extends along one long side 7 a of the substrate 7.
- the sub wiring part 17b extends along one short side 7c and the other short side 7d of the substrate 7, respectively.
- the lead portion 17c extends individually from the main wiring portion 17a toward each heat generating portion 9.
- the main wiring portion 17 d extends along the other long side 7 b of the substrate 7.
- the plurality of individual electrodes 19 are electrically connected between the heat generating portion 9 and the drive IC 11.
- the plurality of heat generating sections 9 are divided into a plurality of groups, and the heat generating sections 9 of each group are electrically connected to the drive IC 11 provided corresponding to each group.
- the plurality of IC-connector connection electrodes 21 are electrically connected between the driving IC 11 and the connector 31.
- the plurality of IC-connector connection electrodes 21 connected to each drive IC 11 are composed of a plurality of wirings having different functions.
- the ground electrode 4 is held at a ground potential of 0 to 1V.
- the ground electrode 4 is surrounded by the individual electrode 19, the IC-connector connection electrode 21, and the main wiring portion 17 d of the common electrode 17.
- connection terminal 2 of the head base 3 connects the common electrode 17, the individual electrode 19, the IC-connector connection electrode 21 and the ground electrode 4 to the connector 31.
- a plurality of connection terminals 2 are provided in the main scanning direction on the other long side 7 b side of the substrate 7.
- the connection terminal 2 is provided corresponding to the connector pin 8 of the connector 31.
- the plurality of IC-IC connection electrodes 26 are electrically connected to adjacent drive ICs 11.
- the plurality of IC-IC connection electrodes 26 are provided so as to correspond to the IC-connector connection electrodes 21, respectively, and transmit various signals to the adjacent drive IC 11.
- the various electrodes constituting the head base 3 can be manufactured as follows, for example.
- the material layers constituting each are sequentially laminated on the heat storage layer 13 and the substrate 7 by a conventionally known thin film forming technique such as sputtering.
- the laminated body is processed into a predetermined pattern by using a conventionally known photoetching or the like to form various electrodes.
- the various electrodes constituting the head base 3 can be formed simultaneously by the same process.
- the drive IC 11 is disposed corresponding to each group of the plurality of heat generating portions 9 as shown in FIG.
- the drive IC 11 is connected to the individual electrode 19 and the IC-connector connection electrode 2 or the ground electrode 4.
- the drive IC 11 has a function of controlling the energization state of each heat generating unit 9.
- the drive IC 11 uses a switching member having a plurality of switching elements therein.
- the drive IC 11 is sealed with a covering member 29 in a state where it is connected to the individual electrode 19, the IC-IC connection electrode 26 and the IC-connector connection electrode 21.
- a protective layer 25 is formed on the heat storage layer 13 to cover the heat generating portion 9, a part of the common electrode 17 and a part of the individual electrode 19.
- the protective layer 25 protects the area covered with the heat generating portion 9, the common electrode 17 and the individual electrode 19 from corrosion due to adhesion of moisture contained in the atmosphere or wear due to contact with the recording medium to be printed. Yes.
- the protective layer 25 can be formed using SiN, SiO 2 , SiON, SiC, diamond-like carbon, or the like.
- the protective layer 25 may be formed of a single layer, or may be formed by stacking these layers. May be.
- Such a protective layer 25 can be produced using a thin film forming technique such as sputtering or a thick film forming technique such as screen printing.
- a coating layer 27 is provided on the substrate 7 to partially cover the common electrode 17, the individual electrode 19, and the IC-connector connection electrode 21.
- the covering layer 27 is formed by oxidizing the region covered with the common electrode 17, the individual electrode 19, the IC-IC connection electrode 26 and the IC-connector connection electrode 21 by contact with the atmosphere or moisture contained in the atmosphere. Protects against corrosion due to adhesion.
- the connector 31 and the head base 3 are fixed by the connector pin 8, the conductive bonding material 23, and the sealing member 12.
- the conductive bonding material 23 is disposed between the connection terminal 2 and the connector pin 8, and the conductive bonding material 23 connects the connection terminal 2 and the connector pin 8. Examples of the conductive bonding material 23 include solder bumps or anisotropic conductive adhesives.
- a plating layer (not shown) made of Ni, Au, or Pd may be provided between the conductive bonding material 23 and the connection terminal 2. Further, the conductive bonding material 23 is not necessarily provided. In this case, the connection terminal 2 and the connector pin 8 may be directly electrically connected using the clip-type connector pin 8.
- the connector 31 has a plurality of connector pins 8 and a housing 10.
- the connector pin 8 is provided on the connection terminal 2 of the head base 3 and electrically connects the connector 31 and the head base 3.
- the housing 10 houses a plurality of connector pins 8.
- a sealing member 12 is provided on the connector pin 8 so that the connector pin 8 is not exposed.
- the sealing member 12 has a first sealing member 12a and a second sealing member 12b.
- the first sealing member 12 a is located on the upper surface of the substrate 7.
- the 1st sealing member 12a is provided so that the connection part of the connector pin 8 and various electrodes may be sealed.
- the second sealing member 12 b is located on the lower surface of the substrate 7.
- the second sealing member 12 b is provided so as to seal the connector pin 8.
- the sealing member 12 is provided so that the connection terminal 2 and the connector pin 8 are not exposed to the outside.
- the sealing member 12 can be formed of, for example, an epoxy thermosetting resin, an ultraviolet curable resin, or a visible light curable resin.
- the 1st sealing member 12a and the 2nd sealing member 12b may be formed with the same material, and may be formed with another material.
- the adhesive layer 14 is disposed on the upper surface of the radiator 1 and joins the head base 3 and the radiator plate 1 together.
- Examples of the adhesive layer 14 include a double-sided tape or a resinous adhesive.
- the covering member 29 and the gap 16 provided inside the covering member 29 will be described in detail with reference to FIG.
- a plurality of drive ICs 11 are arranged in the main scanning direction at intervals.
- a covering member 29 is provided on the plurality of driving ICs 11, and the covering member 29 covers the plurality of driving ICs 11.
- the covering member 29 has a first part 29a, a second part 29b, a third part 29c, and a fourth part 29d.
- the first part 29a is a part obtained by extending the inter-drive IC region 18 provided between the adjacent drive ICs 11 vertically.
- the second part 29b is a part located under the drive IC 11. Specifically, the second portion 29 b is provided between the lower surface of the drive IC 11 and the electrode 4.
- the third part 29c is a part located on the drive IC 11.
- the fourth part 29d is a part located on both sides in the main scanning direction of a group of drive ICs 11 composed of a plurality of drive ICs 11.
- the boundaries of the first part 29a, the second part 29b, the third part 29c, and the fourth part 29d are indicated by two-dot chain lines.
- the first part 29a, the second part 29b, the third part 29c, and the fourth part 29d are provided continuously.
- the covering member 29 can be continuously produced by applying a curable resin with a dispenser so as to straddle the plurality of driving ICs 11.
- the covering member 29 can be formed of a resin such as an epoxy resin or a silicone resin.
- the gap 16 is provided inside the covering member 29.
- the covering member 29 has a first gap 16a and a third gap 16c.
- the first gap 16a is provided in the first portion 29a.
- the third gap 16c is provided in the fourth portion 29d. Further, the first gap 16 a and the third gap 16 c do not communicate with the outside, and are disposed inside the covering member 29.
- the first gap 16a is provided in the first portion 29a, and is arranged in a state of being separated from the head base 3. That is, as shown in FIGS. 4A and 4B, the drive IC 11 has a drive IC 11e at both ends in the main scanning direction and a drive IC 11c between them, and the first gap 16a is the drive IC 11e at the left end.
- the first gap 16a is located above the ground electrode 4 that constitutes the head substrate 3.
- the first gap 16a is located between the first drive IC 11c and the central drive IC 11c.
- the third gap 16c is provided in the fourth portion 29d, and is arranged in a state of being separated from the head base 3.
- the third gap 16c is provided in contact with the drive IC 11e located at the left end in the main scanning direction. That is, as shown in FIG. 4B, the third gap 16c is in contact with the side surface of the drive IC 11e located at the end portion in a state of being separated from the head base 3. In other words, the third gap 16c faces the leftmost drive IC 11e.
- the diameter can be set to 10 to 5000 ⁇ m.
- gap 16c can be calculated
- the first gap 16a and the third gap 16c do not have to be circular.
- the thermal head X1 voltage is supplied from the connector 31 (see FIG. 2) to the drive IC 11, and the drive IC 11 drives the heat generating portion 9 (see FIG. 2) to perform printing.
- the drive IC 11 When the drive IC 11 is driven to process an electrical signal, the drive IC 11 generates heat, and heat is generated in the first part 29a, the second part 29b, the third part 29c, and the fourth part 29d located around the drive IC 11. It is transmitted.
- the first part 29a sandwiched between the second part 29b and the third part 29c is compressed from both sides. As a result, the compressive stress is concentrated on the first part 29a, the first part 29a is damaged, and the sealing performance of the drive IC 11 is deteriorated, so that the drive IC 11 may be defective.
- the first portion 29a has the first gap 16a
- the second portion 29b and the third portion 29c are thermally expanded, and even if a compressive stress is generated in the first portion 29a, By deforming the one gap 16a, the compressive stress acting on the first portion 29a can be relaxed. As a result, the covering member 29 is less likely to be damaged, and the sealing property of the driving IC 11 can be maintained, so that the driving IC 11 is less likely to be defective.
- the heat generation amount of the driving IC 11 is reduced.
- the heat transmitted to the covering member 29 is released to the outside, and the temperature of the covering member 29 gradually decreases.
- the thermally expanded covering member 29 contracts as the temperature decreases.
- the first part 29a sandwiched between the second part 29b and the third part 29c is pulled from both sides, and tensile stress concentrates on the first part 29a, and the first part 29a may be damaged. There is. As a result, the sealing property of the driving IC 11 is lowered, and there is a possibility that the driving IC 11 is defective.
- the first portion 29a has the first gap 16a
- the second portion 29b and the third portion 29c contract and a tensile stress is generated in the first portion 29a
- the first portion 29a By deforming the gap 16a, the tensile stress acting on the first portion 29a can be relaxed. As a result, the covering member 29 is less likely to be damaged, and the sealing property of the driving IC 11 can be maintained, so that the driving IC 11 is less likely to be defective.
- both ends of the covering member 29 located in the inter-driving IC region 18 are fixed by the driving IC 11, when thermally expanded, compressive stress is concentrated from the driving IC 11 to the inter-driving IC region 18, and the cooling member shrinks. When this occurs, tensile stress tends to concentrate. As a result, the covering member 29 in the inter-driving IC region 18 is damaged, the sealing performance of the driving IC 11 is lowered, and the driving IC 11 may be defective.
- the first gap 16a is positioned in the inter-drive IC region 18, the first gap 16a is also generated when the covering member 18 in the inter-drive IC region 18 is thermally expanded or cooled and contracted.
- the compressive stress or the tensile stress can be alleviated, and the covering member 29 is hardly damaged.
- the sealing property of the drive IC 11 can be maintained, so that the drive IC 11 is less likely to be defective.
- the first gap 16a is in contact with the drive IC 11. In other words, the first gap 16a faces the drive IC 11. Thereby, the heat conduction to the first portion 29a is suppressed. As a result, the heat generated in the drive IC 11 is not easily transmitted to the first part 29a, and the first part 29a is hardly expanded by heat. For this reason, the concentration of compressive stress on the first portion 29a can be suppressed, and the covering member is hardly damaged. Therefore, the sealing property of the driving IC 11 can be maintained, and the driving IC 11 is less likely to be defective.
- the covering member 29 has a third gap 16c in a fourth portion 29d provided at the end in the main scanning direction in the drive IC 11 group.
- the third gap 16c is in contact with the drive IC 11.
- the third gap 16c faces the drive IC 11.
- heat conduction to the fourth portion 29d is suppressed.
- the heat generated by the drive IC 11 becomes difficult to be transmitted to the fourth part 29d, and the thermal expansion of the fourth part 29d can be suppressed. Therefore, the compressive stress is prevented from concentrating on the fourth portion 29d, and the covering member 29 is not easily damaged. Therefore, the sealing property of the driving IC 11 is maintained, and the driving IC 11 is less likely to be defective.
- the first gap 16a and the third gap 16c are provided in a state of being separated from the ground electrode 4 of the head base 3, and have a configuration that does not communicate with the outside. Thereby, the possibility that liquid or the like enters from the outside through the first gap 16a and the third gap 16c can be reduced, and the reliability of the thermal head X1 can be improved.
- the third portion 29c does not have the gap 16, the strength of the third portion 29c is difficult to decrease. Therefore, even if the recording medium P and the third portion 29c come into contact with each other, the third portion 29c is hardly damaged, and the possibility that the covering member 29 is damaged can be reduced.
- first gap 16a and the third gap 16c are in contact with the drive IC 11
- it may not be in contact with the drive IC 11.
- the first gap 16a can relieve the stress of the first part 29a, and the third gap 16 can reduce the possibility of heat transfer to the fourth part 29d.
- a plurality of first gaps 16a and third gaps 16c may be provided.
- the gap 16 may be constituted by bubbles. In this case, heat insulation can be enhanced by the air disposed inside the gap 16.
- the thermal head X1 can be manufactured, for example, by the following method.
- the covering member 29 is formed of a two-component thermosetting resin
- the respective viscosities of the main agent and the curing agent are set to a high state, and the main agent and the curing agent are stirred in a state where the viscosity is high.
- the covering member 29 containing 16 can be obtained.
- a foaming agent may be applied to the surface of the driving IC 11 so that the gap 16 is contained in the covering member 29 while being in contact with the driving IC 11.
- the driving IC 11 may be covered with the covering member 29 in a state where an organic solvent having a low boiling point is applied to the surface of the driving IC 11, and the gap 16 may be generated inside the covering member 29 by heating.
- the surface of the drive IC 11 may be processed so that the gap 16 in contact with the drive IC 11 is generated.
- the thermal printer Z1 of the present embodiment includes the thermal head X1, the transport mechanism 40, the platen roller 50, the power supply device 60, and the control device 70 described above.
- the thermal head X1 is attached to an attachment surface 80a of an attachment member 80 provided in a housing (not shown) of the thermal printer Z1.
- the thermal head X1 is attached to the attachment member 80 so as to be along a main scanning direction which is a direction orthogonal to the conveyance direction S of the recording medium P described later.
- the transport mechanism 40 includes a drive unit (not shown) and transport rollers 43, 45, 47, and 49.
- the transport mechanism 40 transports a recording medium P such as thermal paper or image receiving paper onto which ink is transferred in the direction of arrow S in FIG. 5 and on the protective layer 25 positioned on the plurality of heat generating portions 9 of the thermal head X1. It is for carrying.
- the drive unit has a function of driving the transport rollers 43, 45, 47, and 49, and for example, a motor can be used.
- the transport rollers 43, 45, 47, and 49 are formed by, for example, covering cylindrical shaft bodies 43a, 45a, 47a, and 49a made of metal such as stainless steel with elastic members 43b, 45b, 47b, and 49b made of butadiene rubber or the like. Can be configured.
- the recording medium P is an image receiving paper to which ink is transferred
- an ink film is transported together with the recording medium P between the recording medium P and the heat generating portion 9 of the thermal head X1.
- the platen roller 50 has a function of pressing the recording medium P onto the protective film 25 located on the heat generating portion 9 of the thermal head X1.
- the platen roller 50 is disposed so as to extend along a direction orthogonal to the conveyance direction S of the recording medium P, and both ends thereof are supported and fixed so as to be rotatable while the recording medium P is pressed onto the heat generating portion 9. ing.
- the platen roller 50 can be configured by, for example, covering a cylindrical shaft body 50a made of metal such as stainless steel with an elastic member 50b made of butadiene rubber or the like.
- the power supply device 60 has a function of supplying a current for causing the heat generating portion 9 of the thermal head X1 to generate heat and a current for operating the driving IC 11 as described above.
- the control device 70 has a function of supplying a control signal for controlling the operation of the drive IC 11 to the drive IC 11 in order to selectively heat the heat generating portion 9 of the thermal head X1 as described above.
- the thermal printer Z1 presses the recording medium P onto the heat generating part 9 of the thermal head X1 by the platen roller 50, and conveys the recording medium P onto the heat generating part 9 by the conveying mechanism 40.
- the heat generating unit 9 is selectively heated by the power supply device 60 and the control device 70 to perform predetermined printing on the recording medium P.
- the recording medium P is an image receiving paper or the like
- printing is performed on the recording medium P by thermally transferring ink of an ink film (not shown) conveyed together with the recording medium P to the recording medium P.
- the thermal head X2 will be described with reference to FIG.
- the same members as those of the thermal head X1 are denoted by the same reference numerals, and so on.
- the covering member 229 is different from the covering member 29 of the thermal head X1.
- FIG. 6B illustrates a case where the first gap 216a and the second gap 216b are in contact with the drive IC 11c, and a case where the second gap 216b and the third gap 216c communicate with each other. .
- the covering member 229 has a first part 229a, a second part 229b, a third part 229c, and a fourth part 229d.
- the first part 229a is a part obtained by vertically extending the inter-drive IC region 18 provided between adjacent drive ICs, and has a first gap 216a.
- the second part 229b is a part located below the drive IC 11, and has a second gap 216b.
- the third part 229c is a part located on the drive IC 11.
- the fourth portion 229d is a portion located on both sides in the main scanning direction of the drive IC group including the plurality of drive ICs 11, and has a third gap 216c. In FIGS.
- the boundaries of the first part 229a, the second part 229b, the third part 229c, and the fourth part 229d are separated by a two-dot chain line.
- the first part 229a, the second part 229b, the third part 229c, and the fourth part 229d are provided continuously.
- the covering member 229 can be continuously produced by applying a curable resin with a dispenser so as to straddle the plurality of driving ICs 11.
- the first gap 216a is provided in the first part 229a, and is arranged in a state of being separated from the head base 3.
- the first gap 216a is provided in contact with the drive IC 11c. In other words, the first gap 216a faces the drive IC 11c.
- the second gap 216b is provided in the second portion 229b and is arranged in a state of being separated from the head base 3.
- the second gap 216b is provided in contact with the drive IC 11c. In other words, the second gap 216b faces the drive IC 11c.
- the third gap 216c is provided in the fourth portion 229d, and is provided outside the drive IC 11 group in the main scanning direction. Further, the third gap 216c is arranged in a state of being separated from the head base 3. The third gap 216c is disposed in contact with the drive IC 11e located at the end in the main scanning direction. In other words, the third gap 216c faces the drive IC 11e.
- the third gap 216c can have a diameter of 10 to 5000 ⁇ m when it is circular.
- the first gap 216a, the second gap 216b, and the third gap 216c do not have to be circular.
- the covering member 229 when the covering member 229 is cooled after being thermally cured, the covering member 229 contracts, so that the substrate 7 constituting the thermal head X2 may be warped. If a force is applied from the outside to correct the warpage of the substrate 7 and make it flat, the covering member 229 may be damaged.
- the covering member 229 has a second gap 216b in the second portion 229b. Therefore, the contraction in the second portion 229b when the covering member 229 is cured can be relieved by the deformation of the second gap 216b, and the warpage of the substrate 7 can be reduced.
- the second gap 216b is deformed to reduce the concentration of compressive stress, and the covering member 229 is less likely to be damaged. Therefore, the sealing property of the driving IC 11 is maintained, and it is difficult for the driving IC 11 to be defective.
- the driving IC 11 when the driving IC 11 is connected to the electrode by a solder bump, if the compressive stress is applied to the covering member 229 from the outside, the solder bump may be crushed and the crushed solder bump may be short-circuited with other wiring. .
- the covering member 229 has a second gap 216b in the second portion 229b. Therefore, when the compressive stress from the outside is applied, the second gap 216b is deformed, so that the compressive stress applied to the solder bump is reduced and the solder bump is not easily crushed. As a result, a short circuit due to a crushed solder bump is less likely to occur.
- the second gap 216b is in contact with the drive IC 11c.
- the second gap 216b faces the drive IC 11c.
- heat conduction to the second portion 229b is suppressed.
- the heat generated by the drive IC 11 is not easily transmitted to the second part 229b, and the thermal expansion of the second part 229b can be suppressed. Therefore, the compressive stress is prevented from concentrating on the second portion 229b, and the covering member 229 is hardly damaged. Therefore, the sealing property of the driving IC 11 is maintained, and it is difficult for the driving IC 11 to be defective.
- the second gap 216b and the third gap 216c communicate with each other. Therefore, the second portion 229b and the fourth portion 229d can be further deformed. As a result, concentration of compressive stress and tensile stress on the fourth portion 229d can be suppressed, and the covering member 29 is less likely to be damaged.
- the second gap 216b and the third gap 216c communicate with each other, the heat of the heat generating portion located at the end in the main scanning direction is further difficult to be transmitted from the fourth portion 229d to the outside. As a result, heat can be prevented from being radiated to the outside from the fourth portion 229d, and the temperature at the end in the main scanning direction of the thermal head X2 is unlikely to decrease. Therefore, temperature variations in the main scanning direction of the thermal head X2 can be reduced.
- part 229b can further be made possible.
- concentration of compressive stress and tensile stress on the first portion 229a can be suppressed, and the covering member 229 is less likely to be damaged.
- the sealing property of the driving IC 11 can be maintained, and the driving IC 11 is less likely to be defective.
- the gap 216 in which the second gap 216b and the third gap 216c communicate with each other has a length in the main scanning direction (hereinafter referred to as a width) in a cross-sectional view, and a lower width is longer than an upper width. ing. In other words, the gap 216 becomes wider as it goes downward. Thereby, the compressive stress applied to the solder bump can be further reduced.
- gap 216c do not necessarily need to connect.
- the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
- the thermal printer Z1 using the thermal head X1 according to the first embodiment is shown, the present invention is not limited to this, and the thermal head X2 may be used for the thermal printer Z1.
- a plurality of thermal heads X1 and X2 may be combined.
- the thin film head of the heat generating portion 9 is illustrated by forming the electric resistance layer 15 as a thin film, but the present invention is not limited to this.
- the present invention may be used for a thick film head of the heat generating portion 9 by forming a thick film of the electric resistance layer 15 after patterning various electrodes.
- planar head in which the heat generating portion 9 is formed on the main surface of the substrate 7 has been described as an example, but the present invention may be used for an end face head in which the heat generating portion 9 is provided on the end surface of the substrate 7.
- the heat storage layer 13 may be provided over the entire upper surface of the substrate 7.
- the heat generating portion 9 is formed by forming the common electrode 17 and the individual electrode 19 on the heat storage layer 13 and forming the electric resistance layer 15 only in the region between the common electrode 17 and the individual electrode 19. Good.
- the covering member 29 covers all the drive ICs 11 is shown, but the present invention is not limited to this.
- the covering member 29 may be provided so as to cover at least two drive ICs, and may not cover other drive ICs 11 integrally. Even in this case, since the covering member 29 has the first gap 16a in the first portion 29a, the possibility of the covering member 29 being damaged can be reduced.
- the covering member 29 has the first gap 16a in the first portion 16a is shown, but the present invention is not limited to this.
- the covering member 29 only needs to have at least one gap 16, and the first gap 16a is not necessarily provided in the first portion 29a. Even in this case, since the covering member 29 has the second gap 16b in the second portion 29b or the third gap 16c in the fourth portion 29d, the possibility of the covering member 29 being damaged can be reduced.
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Abstract
Description
以下、サーマルヘッドX1について図1~4を参照して説明する。図1は、サーマルヘッドX1の構成を概略的に示している。図2は、保護層25、被覆層27、および封止部材12を一点鎖線にて示している。また、図4(a)では、基板7上に設けられた部材のうち、駆動IC11と被覆部材29のみを示している。
図6を用いてサーマルヘッドX2について説明する。なお、サーマルヘッドX1と同一の部材については同一の符号を付しており、以下同様とする。サーマルヘッドX2は、被覆部材229が、サーマルヘッドX1の被覆部材29と異なっている。また、図6(b)には、第1空隙216aと第2空隙216bが駆動IC11cに接触している場合と、第2空隙216bと第3空隙216cが連通している場合を例示している。
Z1 サーマルプリンタ
1 放熱板
3 ヘッド基体
7 基板
9 発熱部
11 駆動IC
13 蓄熱層
14 接着層
16,216 空隙
16a,216a 第1空隙
16b,216b 第2空隙
16c,216c 第3空隙
29,229 被覆部材
29a,229a 第1部位
29b,229b 第2部位
29c,229c 第3部位
29d,229d 第4部位
31 コネクタ
Claims (10)
- 基板と、
前記基板上に設けられた発熱部と、
前記基板上に設けられ、前記発熱部の駆動を制御するための複数の駆動ICと、
複数の前記駆動ICを被覆する被覆部材と、を備え、
前記被覆部材は、隣り合う前記駆動IC間に設けられた駆動IC間領域を上下に伸ばした第1部位と、前記駆動ICの下に設けられた第2部位と、前記駆動ICの上に設けられた第3部位と、を有しており、
前記第1部位は、第1空隙を有していることを特徴とするサーマルヘッド。 - 前記第1空隙が、前記駆動IC間領域に位置している、請求項1に記載のサーマルヘッド。
- 前記第1空隙は、前記駆動ICと接触している、請求項2に記載のサーマルヘッド。
- 前記被覆部材は、前記第2部位に第2空隙を有している、請求項1から3のいずれか一項に記載のサーマルヘッド。
- 前記第2空隙は、前記駆動ICと接触している、請求項4に記載のサーマルヘッド。
- 前記第1空隙と前記第2空隙とが連通している、請求項4または5に記載のサーマルヘッド。
- 複数の前記駆動ICが主走査方向に所定の間隔をおいて配列されて駆動IC群を構成しており、
前記被覆部材は、前記駆動IC群の主走査方向端に設けられた第4部位を有し、
前記第4部位は、第3空隙を有している、請求項1から6のいずれか一項に記載のサーマルヘッド。 - 前記第3空隙は、前記駆動ICと接触している、請求項7に記載のサーマルヘッド。
- 前記第2空隙と前記第3空隙とが連通している、請求項7または8に記載のサーマルヘッド。
- 請求項1から9のうちいずれか一項に記載のサーマルヘッドと、
前記発熱部上に記録媒体を搬送する搬送機構と、
前記発熱部上に前記記録媒体を押圧するプラテンローラと、を備えることを特徴とするサーマルプリンタ。
Priority Applications (3)
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US15/762,311 US10279596B2 (en) | 2015-09-26 | 2016-09-26 | Thermal head and thermal printer |
JP2017540941A JPWO2017051919A1 (ja) | 2015-09-26 | 2016-09-26 | サーマルヘッドおよびサーマルプリンタ |
CN201680054356.0A CN108025559B (zh) | 2015-09-26 | 2016-09-26 | 热敏头以及热敏式打印机 |
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JP (1) | JPWO2017051919A1 (ja) |
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US10279596B2 (en) | 2019-05-07 |
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CN108025559B (zh) | 2019-09-27 |
US20180281451A1 (en) | 2018-10-04 |
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