JPWO2016114289A1 - Thermal print head - Google Patents

Thermal print head Download PDF

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Publication number
JPWO2016114289A1
JPWO2016114289A1 JP2016050792A JP2016569472A JPWO2016114289A1 JP WO2016114289 A1 JPWO2016114289 A1 JP WO2016114289A1 JP 2016050792 A JP2016050792 A JP 2016050792A JP 2016569472 A JP2016569472 A JP 2016569472A JP WO2016114289 A1 JPWO2016114289 A1 JP WO2016114289A1
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Prior art keywords
print head
thermal print
layer
substrate
connector
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Granted
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JP2016050792A
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JP6618932B2 (en
Inventor
雅寿 中西
雅寿 中西
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ローム株式会社
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Priority to PCT/JP2016/050792 priority patent/WO2016114289A1/en
Publication of JPWO2016114289A1 publication Critical patent/JPWO2016114289A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters 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
    • B41J2/32Typewriters 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
    • B41J2/335Structure of thermal heads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters 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
    • B41J2/32Typewriters 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
    • B41J2/345Typewriters 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

Abstract

A thermal print head according to the present invention includes a printed circuit board having a plurality of heat generating portions arranged in the main scanning direction, a heat radiating member, and a connector board provided with a main connector for connection to the outside of the apparatus. Prepare. The printed circuit board is detachable from the heat radiating member, and includes a position defining unit that defines a position of the printed circuit board in the sub-scanning direction with respect to the heat radiating member.

Description

  The present invention relates to a thermal print head.

  The thermal print head is a main component device of a thermal printer that prints on thermal paper or the like. Patent Document 1 discloses an example of a conventional thermal print head. In the thermal print head disclosed in this document, a resistor layer and an electrode layer are laminated on a substrate. By patterning these resistor layers and electrode layers, a plurality of heat generating portions arranged in the main scanning direction are constituted by the resistor layers. The resistor layer and the electrode layer are covered with an insulating protective layer. The protective layer is for avoiding damage to the electrode layer and the resistor layer due to friction with thermal paper or the like.

  When the thermal print head is used, the plurality of heat generating portions and the periphery thereof rub against thermal paper or the like. For this reason, among the thermal print heads, the plurality of heat generating portions and the periphery thereof are selectively deteriorated. However, when these parts reach the expected life, it is forced to remove the entire thermal print head from the thermal printer and install the new thermal print head. This leads to an increase in the disposal burden.

JP 2013-248756 A

  The present invention has been conceived under the circumstances described above, and an object of the present invention is to provide a thermal print head capable of reducing the disposal burden.

  A thermal print head provided by the present invention includes a printed circuit board having a plurality of heat generating portions arranged in the main scanning direction, a heat radiating member, and a connector board provided with a main connector for connection to the outside of the apparatus. The print substrate is detachable from the heat radiating member, and includes a position defining means for defining a position of the print substrate in the sub-scanning direction with respect to the heat radiating member.

  In a preferred embodiment of the present invention, a driver IC mounted on the print board is provided.

  In a preferred embodiment of the present invention, a sub-connector for conducting the print substrate and the connector substrate is provided.

  In a preferred embodiment of the present invention, the position defining means includes a contact surface provided on the heat radiating member and located on the downstream side in the sub-scanning direction with respect to the print substrate.

  In a preferred embodiment of the present invention, the contact surface is inclined so as to cover the downstream end surface of the print substrate in the main scanning direction in plan view.

  In a preferred embodiment of the present invention, the downstream end surface of the print substrate in the main scanning direction is parallel to the contact surface.

  In a preferred embodiment of the present invention, the position defining means includes an urging mechanism that urges a pressing force that abuts the print substrate against the abutment surface.

  In a preferred embodiment of the present invention, the position defining means includes a connector board elastic member for attaching the connector board to the heat radiating member.

  In a preferred embodiment of the present invention, the elastic member for a connector board urges the pressing force through the connector board.

  In a preferred embodiment of the present invention, the biasing mechanism includes an intermediate elastic member interposed between the print board and the connector board.

  In a preferred embodiment of the present invention, the position defining means includes a positioning recess provided in the print substrate, and a positioning protrusion provided in the heat dissipation member and entering the positioning recess.

  In a preferred embodiment of the present invention, the position defining means includes a plurality of positioning concave portions and a plurality of positioning convex portions.

  In a preferred embodiment of the present invention, the plurality of positioning concave portions and the plurality of positioning convex portions include those spaced apart from each other in the main scanning direction.

  In a preferred embodiment of the present invention, the plurality of positioning concave portions and the plurality of positioning convex portions include those that are separated from each other in the sub-scanning direction.

  In a preferred embodiment of the present invention, the positioning recess is recessed in the thickness direction of the print substrate, and the positioning protrusion protrudes in the thickness direction of the print substrate.

  In preferable embodiment of this invention, the flexible wiring board which connects the said subconnector and the said connector board is provided.

  In a preferred embodiment of the present invention, the printing substrate includes a base material, a glaze layer supported by the base material, and a wiring layer formed in the glaze layer, and the wiring layer includes the plurality of wiring layers. It includes a resistor layer that constitutes the heat generating portion and an electrode layer that conducts to the resistor layer.

  In a preferred embodiment of the present invention, the wiring layer is formed by a thin film forming method, and the resistor layer is interposed between the wiring layer and the glaze layer.

  In a preferred embodiment of the present invention, the wiring layer is formed by baking a thick-film printed paste, and the resistor layer has a strip shape extending long in the main scanning direction.

  In a preferred embodiment of the present invention, the printed circuit board comprises a semiconductor substrate, an insulating layer formed on the substrate, an electrode layer formed on the insulating layer, and a wiring layer formed of a resistor layer. And the resistor layer constitutes the plurality of heat generating portions.

  In a preferred embodiment of the present invention, the semiconductor is made of a material selected from any of Si, SiC, AlN, GaP, GaAs, InP, and GaN.

In a preferred embodiment of the present invention, the insulating layer is made of SiO 2 or SiAlO 2 .

In a preferred embodiment of the present invention, the resistor layer is made of at least one of polysilicon, TaSiO 2 , and TiON.

  In a preferred embodiment of the present invention, the electrode layer is made of at least one of Au, Ag, Cu, Cr, Al—Si, and Ti.

  According to the present invention, the position defining means defines the position of the print substrate in the sub-scanning direction. The print substrate is provided with the plurality of heat generating portions. During printing, thermal paper or the like is pressed against the thermal print head by, for example, a platen roller provided in the thermal printer. The more accurate the positions of the plurality of heat generating portions in the sub-scanning direction, the more effectively the thermal paper or the like is pressed by the platen roller. This contributes to printing accuracy and clarity. In the thermal print head, the print substrate can be detached from the heat radiating member. For this reason, when the heat generating portion and the protective layer are to be replaced due to deterioration due to use or the like, it is possible to remove the print substrate from the heat radiating member and replace it with a new print substrate. Therefore, the thermal print head according to the present invention can reduce the disposal burden.

  Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.

It is a top view which shows the thermal print head based on 1st Embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is a principal part expanded sectional view which shows the thermal print head of FIG. FIG. 3 is a cross-sectional view showing an assembly process of the thermal print head of FIG. 1. FIG. 3 is a cross-sectional view showing an assembly process of the thermal print head of FIG. 1. FIG. 6 is an enlarged plan view of a main part showing a modification of the thermal print head in FIG. 1. It is a principal part expanded sectional view which follows the VII-VII line of FIG. FIG. 10 is an enlarged cross-sectional view of a main part showing another modification of the thermal print head of FIG. It is sectional drawing which shows the thermal print head based on 2nd Embodiment of this invention. FIG. 10 is a cross-sectional view showing an assembly process of the thermal print head of FIG. 9. It is sectional drawing which shows the thermal print head based on 3rd Embodiment of this invention. It is sectional drawing which shows the thermal print head based on 4th Embodiment of this invention. FIG. 13 is a cross-sectional view showing an assembly process of the thermal print head of FIG. 12. It is a top view which shows the thermal print head based on 5th Embodiment of this invention. It is sectional drawing which follows the XV-XV line | wire of FIG.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  1 to 3 show a thermal print head according to a first embodiment of the present invention. The thermal print head A <b> 1 of the present embodiment includes a print substrate 1, a connector substrate elastic member 41, a connector substrate 6, and a heat dissipation member 7.

  FIG. 1 is a plan view showing the thermal print head A1. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a main part. In these drawings, the main scanning direction is the x direction, and the sub scanning direction is the y direction. With respect to the y direction, the lower side in the drawing of FIG. 1 and the right side in the drawing in FIG. 2 are the upstream side to which the thermal paper or the like is sent, and the upper side in the drawing in FIG. This is the downstream side where thermal paper is discharged. Moreover, in FIG. 1, the protective layer 3 mentioned later is abbreviate | omitted for convenience of understanding.

  The printed circuit board 1 includes a base material 10, a wiring layer 2, a protective layer 3, a driver IC 5, and a sub connector 62.

  The base material 10 serves as a base of the thermal print head A1, and the surface preferably exhibits insulating properties. Although the material of the base material 10 is not specifically limited, In this embodiment, the case where it consists of ceramics, such as an alumina, is demonstrated to an example. The substrate 10 has a long rectangular shape that extends long in the x direction. The base material 10 has a main surface 11 and a back surface 12 that face each other in the z direction. A glaze layer 13 is formed on the main surface 11 of the substrate 10. The glaze layer 13 is made of a glass material such as amorphous glass. The glaze layer 13 covers the front surface of the main surface 11 and has a belt-like portion that extends long in the x direction and has a cross section in the yz plane that slightly bulges in the z direction. Note that the glaze layer 13 may be formed on a part of the main surface 11 of the substrate 10. Further, the base material 10 has an end face 14. The end surface 14 is an end surface located on the downstream side in the y direction.

  The wiring layer 2 constitutes a path through which current flows in the thermal print head A1, and is formed on the glaze layer 13 of the main surface 11 of the substrate 10 in this embodiment. The wiring layer 2 may have a portion formed in a portion other than the main surface 11 of the substrate 10. The wiring layer 2 includes a resistor layer 21 and an electrode layer 22. In the present embodiment, the resistor layer 21 and the electrode layer 22 will be described by taking, as an example, a configuration formed by a thin film forming technique such as sputtering described later, but is not limited thereto.

The resistor layer 21 is formed on the glaze layer 13 of the main surface 11 of the substrate 10. The resistor layer 21 has a plurality of heat generating portions 211. The plurality of heat generating portions 211 are arranged in a row in the x direction on the glaze layer 13. Heat generated by current flowing through these heat generating portions 211 becomes a heat source for printing by the thermal print head A1. Examples of the material of the resistor layer 21 include TaSiO 2 and TaN. Further, the thickness of the resistor layer 21 is not particularly limited, but an example thereof is, for example, about 0.05 μm to 0.2 μm.

  The electrode layer 22 is formed on the resistor layer 21 and is made of a material having a resistance value smaller than that of the resistor layer 21. Examples of such a material of the electrode layer 22 include Al, but are not limited thereto. For example, Cu or Au may be used. The thickness of the electrode layer 22 is not particularly limited, but an example thereof is, for example, about 0.5 μm to 2.0 μm.

  In the present embodiment, the resistor layer 21 exists in the entire region where the wiring layer 2 is formed. On the other hand, the electrode layer 22 exposes part of the resistor layer 21 as appropriate. Specifically, the electrode layer 22 has a plurality of individual electrodes 221 and a common electrode 222. Each of the plurality of individual electrodes 221 has a strip shape extending along the y direction, and extends to the plurality of heat generating portions 211. The common electrode 222 has a plurality of comb teeth 223 and a detour (not shown). Each of the plurality of comb-tooth portions 223 is disposed to face the individual electrode 221 with the heat generating portion 211 interposed therebetween in the y direction. That is, portions of the resistor layer 21 that are exposed from the electrode layer 22 between the plurality of individual electrodes 221 and the plurality of comb-tooth portions 223 are the plurality of heat generating portions 211. The bypass portion is connected to a plurality of comb teeth portions 223, and has, for example, a portion extending in the x direction on the main surface 11 of the substrate 10 and a portion extending in the y direction from this end portion.

The protective layer 3 is for protecting the wiring layer 2. The protective layer 3 covers at least the plurality of heat generating portions 211, and covers almost all of the wiring layer 2 in this embodiment. The protective layer 3 is a layer in contact with the heat generating part 211 and is made of an insulating material. Such an insulating material is not particularly limited, and an example thereof is SiO 2 .

  The driver IC 5 controls the heat generation distribution and the heat generation timing in the plurality of heat generating portions 211 by selectively energizing the plurality of heat generating portions 211. As shown in FIG. 1, in the present embodiment, a plurality of driver ICs 5 are disposed on the upper portion of the base material 10 in the y direction. As shown in FIG. 3, a plurality of wires 52 are bonded to a plurality of electrodes provided on the upper surface of the driver IC 5. Some of these wires 52 are bonded to a plurality of pad portions connected to the plurality of individual electrodes 221 of the wiring layer 2. The other part of the plurality of wires 52 is joined to the other part of the electrode layer 22.

  As shown in FIG. 2, the driver IC 5 is covered with a sealing member 51. The sealing member 51 is, for example, a black insulating resin, is for protecting the driver IC 5, and covers the driver IC 5.

  The sub connector 62 is for electrically connecting the printed board 1 and the connector board 6. The sub connector 62 is joined to an appropriate position of the electrode layer 22 of the wiring layer 2 through, for example, solder. Further, the sub connector 62 is electrically connected to the driver IC 5 through the electrode layer 22 of the wiring layer 2. In the present embodiment, the sub-connector 62 is disposed in the vicinity of the upstream end of the base material 10 in the y direction.

  The connector substrate 6 is disposed adjacent to the print substrate 1 on the upstream side in the y direction. The connector board 6 includes a main connector 61 and a sub connector 62. The main connector 61 is used to connect the thermal print head A1 to, for example, a thermal printer outside the apparatus. The sub connector 62 is used for connection with the sub connector 62 of the printed circuit board 1. The main connector 61 is disposed in the vicinity of the upstream end of the connector substrate 6 in the y direction. The sub connector 62 is disposed in the vicinity of the downstream end of the connector substrate 6 in the y direction. In the connector substrate 6, a base material that supports the main connector 61 and the sub connector 62 is employed. This base material consists of glass epoxy resins, for example. In addition, a wiring pattern for appropriately connecting the main connector 61 and the sub connector 62 is formed on the base material.

  The heat radiating member 7 is for radiating the heat generated from the printed circuit board 1 during printing to the outside. In the present embodiment, the heat radiating member 7 has a support surface 71, a contact surface 72, and a recess 73, and has a shape that extends long in the x direction. The support surface 71 is a surface facing upward in the z-direction diagram, and supports the print substrate 1 and the connector substrate 6. The contact surface 72 is a surface facing the upstream side in the y direction on the downstream side in the y direction. In the present embodiment, the contact surface 72 is connected to the support surface 71. The recess 73 is provided in a portion of the heat dissipation member 7 that is located on the opposite side of the support surface 71 in the z direction. Further, the recess 73 is provided in the upstream portion of the heat radiating member 7 in the y direction. The recess 73 is recessed upward in the z direction. The heat radiating member 7 is preferably made of metal, for example, aluminum. Moreover, it is preferable that the heat radiating member 7 is formed by extrusion molding of aluminum. In this case, the cross section shown in FIG. 2 is constant in the x direction.

  The connector board elastic member 41 is an example of a position defining means for defining a position of the printed board 1 in the y direction with respect to the heat radiating member 7. Furthermore, in the present embodiment, the connector board elastic member 41 is an example of an urging mechanism that urges a pressing force that abuts the printed board 1 against the abutting surface 72 of the heat radiating member 7.

  The connector board elastic member 41 is formed by cutting and bending a plate material made of, for example, spring steel. One end of the connector board elastic member 41 is fixed to the lower surface of the connector board 6 in the z-direction view, for example, with a bolt or the like. A plurality of illustrated bent portions are formed between one end and the other end of the connector board elastic member 41. These bent portions are provided with an elastic force that acts so as to sandwich the heat radiating member 7 in the z direction together with the connector substrate 6 when the other end of the connector board elastic member 41 is fitted in the recess 73 of the heat radiating member 7. It is formed to be energized. Further, the plurality of bent portions are arranged so that the end surface 14 of the printed board 1 is connected to the heat radiating member 7 via the connector board 6 when the other end of the connector board elastic member 41 is fitted in the concave portion 73 of the heat radiating member 7. An elastic force that presses against the contact surface 72 is biased.

  Next, an example of the assembly process of the thermal print head A1 will be described below with reference to FIGS.

  First, as shown in FIG. 4, a printed board 1 and a heat radiating member 7 are prepared. As described above, the printed circuit board 1 is in a state in which the wiring layer 2, the protective layer 3, the driver IC 5, and the sub connector 62 are provided on the base material 10. Then, the print substrate 1 is placed on the support surface 71 of the heat dissipation member 7. At this time, an adhesive or the like for fixing the base material 10 may be applied to the support surface 71 of the heat radiating member 7. However, it is preferable that the adhesive does not immediately fix the placed base material 10 to the support surface 71 but is solidified at an intended timing. As an adhesive capable of realizing solidification at an intended timing, an adhesive having a solidification time significantly longer than the time required for mounting the connector board 6 described later, or an adhesive that solidifies at a desired timing by infrared rays, heating, etc. Is mentioned. In addition, the adhesive should be able to be removed from the heat radiating member 7 according to the intentions of users and manufacturers.

  Next, as shown in FIG. 5, the connector board 6 is approached from the upstream side of the print board 1 in the y direction. At this time, by pushing down the other end of the connector board elastic member 41 downward in the z direction, the heat radiation member 7 can enter between the other end of the connector board elastic member 41 and the connector board 6. Then, the heat radiating member 7 is advanced downstream in the y direction, and the other end portion of the connector board elastic member 41 is fitted into the recess 73 of the heat radiating member 7. At substantially the same time, the connector substrate 6 abuts on the print substrate 1 and the sub connector 62 of the print substrate 1 and the sub connector 62 of the connector substrate 6 are coupled. As a result, the connector substrate 6 is attached to the heat radiating member 7, and the print substrate 1 and the connector substrate 6 are connected. Further, the printed circuit board 1 is pushed downstream in the y direction from the heat radiating member 7 by the elastic force urged by the connector board elastic member 41, so that the end surface 14 of the base material 10 contacts the abutting surface 72 of the heat radiating member 7. Abut. Thereafter, the thermal print head A1 is completed by solidifying the above-described adhesive or the like.

  Next, the operation of the thermal print head A1 will be described.

  According to the present embodiment, the position of the printed board 1 in the y direction is defined by the connector board elastic member 41. The print substrate 1 is provided with a plurality of heat generating portions 211. During printing, thermal paper or the like is pressed against the thermal print head A1 by, for example, a platen roller provided in the thermal printer. The more accurate the positions of the plurality of heat generating portions 211 in the y direction, the more effectively the thermal paper or the like is pressed by the platen roller. This contributes to printing accuracy and clarity. In the thermal print head A 1, the print substrate 1 can be detached from the heat radiating member 7. For this reason, when the heat generating part 211 and the protective layer 3 are to be replaced due to deterioration due to use or the like, it is possible to remove the printed circuit board 1 from the heat radiating member 7 and replace it with a new printed circuit board 1. . Therefore, according to the thermal print head A1, the disposal burden can be reduced.

  By providing the heat dissipation member 7 with the contact surface 72, the position of the print substrate 1 in the y direction can be more accurately defined.

  The connector board elastic member 41 urges an elastic force for fixing the connector board 6 to the heat radiating member 7 and an elastic force for pressing the print board 1 against the contact surface 72 of the heat radiating member 7. Thereby, fixation of the heat radiating member 7 and position regulation of the printed circuit board 1 can be achieved reasonably.

  6 to 15 show modifications and other embodiments of the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.

  6 and 7 show a modification of the thermal print head A1. This modification particularly shows a modification of the print substrate 1 of the thermal print head A1.

  FIG. 6 is a plan view of an essential part showing this modification. FIG. 7 is an enlarged cross-sectional view of a main part taken along line VII-VII in FIG.

Substrate 10 is made of, for example, ceramics such as Al 2 O 3, for example, its thickness is about 0.6 to 1.0 mm. The base material 10 has a long rectangular shape that extends long in the x direction. Or the structure which consists of glass epoxy resins may be sufficient as the base material 10, for example.

  The glaze layer 13 is formed on the substrate 10 and is made of a glass material such as amorphous glass. The softening point of this glass material is, for example, 800 to 850 ° C. The band-like portion that bulges upward in the glaze layer 13 is formed by firing a glass paste after thick film printing.

  The wiring layer 2 has a resistor layer 21 and an electrode layer 22.

  The electrode layer 22 is for forming a path for energizing the resistor layer 21 and is made of, for example, a conductor mainly composed of Ag. The electrode layer 22 is formed, for example, by printing and baking an Ag paste for thick film printing.

  As shown in FIG. 6, the electrode layer 22 includes a common electrode 222 and a plurality of individual electrodes 221. The common electrode 222 has a plurality of comb-tooth portions 223 and a detour portion 224. The detour portion 224 is disposed near the downstream end of the base material 10 in the y direction, and has a strip shape extending in the x direction. Each of the plurality of comb teeth portions 223 extends from the bypass portion 224 to the upstream side in the y direction, and is arranged at an equal pitch in the x direction.

  The plurality of individual electrodes 221 are for partially energizing the resistor layer 21 and are portions having a reverse polarity with respect to the common electrode 222. The individual electrode 221 extends from the resistor layer 21 toward the driver IC 5. The plurality of individual electrodes 221 are connected to the driver IC 5 by a plurality of wires 52.

  The resistor layer 21 is made of, for example, ruthenium oxide having a resistivity higher than that of the material constituting the electrode layer 22, and is formed in a strip shape extending in the x direction. In this modification, the resistor layer 21 is formed by printing and baking a thick film printing paste containing ruthenium oxide or the like. The resistor layer 21 intersects the plurality of comb teeth 223 of the common electrode 222 and the plurality of individual electrodes 221. A portion of the resistor layer 21 sandwiched between each comb-tooth portion 223 and each individual electrode 221 is a heat generating portion 211 that generates heat when being partially energized by the electrode layer 22. It is formed.

  The protective layer 3 is for protecting the resistor layer 21 and the electrode layer 22. The protective layer 3 is made of amorphous glass, for example.

  FIG. 8 shows another modification of the thermal print head A1. This modification particularly shows a modification of the print substrate 1 of the thermal print head A1.

  FIG. 8 is an enlarged cross-sectional view of a main part showing the thermal print head A1.

  In this modification, the printed circuit board 1 is different from the above-described example in the configuration of the base material 10, the insulating layer 15, the wiring layer 2, and the protective layer 3.

  The substrate 10 has a plate shape. In this modification, the base material 10 is made of a semiconductor material. Examples of the semiconductor material constituting the substrate 10 include Si, SiC, AlN, GaP, GaAs, InP, and GaN. The thickness of the base material 10 is, for example, 0.625 to 0.720 mm. The base material 10 has a flat plate shape that extends long in the x direction. The width | variety (dimension in ay direction) of the base material 10 is 3-20 mm, for example. The dimension in the x direction of the base material 10 is, for example, 10 to 300 mm.

The insulating layer 15 is formed on the main surface 11 of the substrate 10. The insulating layer 15 covers the entire main surface 11 of the substrate 10. The insulating layer 15 is for storing heat generated in the heat generating portion 211. The thickness of the insulating layer 15 is 3 μm or more, for example. The insulating layer 15 is made of, for example, SiO 2 or SiAlO 2 .

  The wiring layer 2 includes a resistor layer 21 and an electrode layer 22. The electrode layer 22 is formed on the main surface 11 of the substrate 10. Specifically, the electrode layer 22 in FIG. 3 is laminated on the insulating layer 15. The electrode layer 22 is laminated on the resistor layer 21. In this modification, a resistor layer 21 is interposed between the electrode layer 22 and the insulating layer 15. The electrode layer 22 is electrically connected to the resistor layer 21. The electrode layer 22 constitutes a path for energizing the resistor layer 21. Examples of the material constituting the electrode layer 22 include Au, Ag, Cu, Cr, Al—Si, and Ti. Unlike this modification, the electrode layer 22 may be interposed between the insulating layer 15 and the resistor layer 21.

  Also in this modification, the electrode layer 22 has a plurality of heat generating portions 211 and a common electrode 222. The common electrode 222 has a plurality of comb teeth 223. Each individual electrode 221 and each comb-tooth portion 223 are opposed to each other in the y direction with the heat generating portion 211 of the resistor layer 21 interposed therebetween.

The resistor layer 21 is formed on the base material 10. In the present modification, the resistor layer 21 is formed directly on the insulating layer 15. The resistor layer 21 generates heat as a plurality of heat generating portions 211 in the portion where the current from the electrode layer 22 flows. Print dots are formed by generating heat in this way. The resistor layer 21 is made of a material having a higher resistivity than the material constituting the electrode layer 22. Examples of the material constituting the resistor layer 21 include polysilicon, TaSiO 2 , and TiON. In the present embodiment, the resistor layer 21 is doped with ions (for example, boron) for adjusting the resistance value. The thickness of the resistor layer 21 is, for example, 0.2 μm to 1 μm.

The protective layer 3 is made of an insulating material, for example, SiO 2 and SiAlO 2 .

  The modifications described above can be appropriately employed in the embodiments described below.

  FIG. 9 shows a thermal print head according to the second embodiment of the present invention. The thermal print head A2 of this embodiment is mainly different from the above-described embodiment in the configuration of the connector board 6.

  In the present embodiment, a flexible wiring board 63 is attached to the connector board 6. The flexible wiring board 63 is formed by laminating a flexible insulating resin film and a wiring pattern layer. The flexible wiring board 63 is freely bendable by a user or the like and constitutes a conduction path. One end of the flexible wiring board 63 is connected to the sub connector 62, and the other end is connected to a wiring pattern (not shown) of the connector board 6.

  FIG. 10 shows an assembly process of the thermal print head A2. In the present embodiment, until the printed board 1 and the connector board 6 are fixed to the heat radiating member 7 by the elastic force urged by the connector board elastic member 41, The sub-connector 62 of the connector board 6 is not connected. In the process of attaching the printed circuit board 1 and the connector board 6, the sub-connector 62 of the connector board 6 is retracted using the flexibility of the flexible wiring board 63. Then, after the attachment of the printed board 1 and the connector board 6 to the heat dissipation member 7 is completed, the sub-connectors 62 are connected to each other.

  Also according to such an embodiment, the disposal burden due to the thermal print head A2 can be reduced. Further, by providing the flexible wiring board 63, the sub-connectors 62 can be connected to each other after the printed board 1 and the connector board 6 are fixed to the heat radiating member 7.

  FIG. 11 shows a thermal print head according to a third embodiment of the present invention. The thermal print head A3 of the present embodiment is different from the above-described embodiments in the configuration of the base material 10 and the heat dissipation member 7 of the print substrate 1.

  The contact surface 72 of the heat radiating member 7 is inclined with respect to the x direction and the z direction. That is, the contact surface 72 is inclined so as to cover a part of the end surface 14 of the substrate 10 in the z-direction view. In other words, the abutting surface 72 is inclined so as to be positioned upstream of the support surface 71 in the y direction as it goes upward in the z direction.

  The end surface 14 of the substrate 10 is parallel to the contact surface 72 of the heat dissipation member 7. That is, the end surface 14 is inclined so as to be located upstream in the y direction as it goes upward in the z direction from the back surface 12.

  Also according to such an embodiment, the disposal burden due to the thermal print head A3 can be reduced. Further, the support surface 71 and the end surface 14 are the inclined surfaces described above. For this reason, when the end surface 14 of the printed circuit board 1 is pressed against the contact surface 72 of the heat radiating member 7 by the elastic force of the connector board elastic member 41, the component force to press the printed circuit board 1 against the support surface 71 of the heat radiating member 7 is increased. Arise. Thereby, the printed circuit board 1 can be more reliably fixed to the heat radiating member 7.

  FIG. 12 shows a thermal print head according to the fourth embodiment of the present invention. The thermal print head A4 of this embodiment is different from the above-described embodiment in the configuration of an urging mechanism that is a position defining means in the present invention.

  In the present embodiment, an intermediate elastic member 42 is provided as an urging mechanism which is a position defining means referred to in the present invention. The intermediate elastic member 42 includes a rod-shaped member that protrudes downstream in the y direction of the connector substrate 6 and a spring that surrounds the rod-shaped member. In the illustrated state, the spring is compressed from its natural length, and an elastic force that pushes the rod-like member downstream in the y direction is urged. Due to this elastic force, the end surface 14 of the printed circuit board 1 is pressed against the contact surface 72 of the heat radiating member 7. The connector substrate 6 is fixed to the heat radiating member 7 with, for example, an adhesive tape.

  FIG. 13 shows an assembly process of the thermal print head A4. In the figure, first, the heat radiating member 7 is fixed to the printed circuit board 1. At this time, the spring of the intermediate elastic member 42 has a natural length, and the rod-like member protrudes greatly downstream in the y direction. The spring is contracted so that the rod-shaped member is retracted upstream in the y direction. Next, the printed board 1 is placed between the contact surface 72 of the heat radiating member 7 and the connector board 6. At this time, the compression of the spring is released, and the intercept member moves forward in the y direction downstream side. Then, when the rod-shaped member comes into contact with the print substrate 1, the elastic force of the spring is transmitted to the print substrate 1. As a result, the end surface 14 of the print substrate 1 is pressed against the contact surface 72 of the heat dissipation member 7.

  Also according to such an embodiment, the disposal burden due to the thermal print head A4 can be reduced.

  14 and 15 show a thermal print head according to a fifth embodiment of the present invention. The thermal print head A5 of the present embodiment is different from the above-described embodiment in the configuration of the position defining means referred to in the present invention.

  In the present embodiment, a plurality of positioning convex portions 74 and a plurality of positioning concave portions 17 are provided as position defining means. The plurality of positioning protrusions 74 are a part of the heat dissipation member 7. The positioning projection 74 protrudes from the support surface 71 of the heat dissipation member 7. More specifically, the positioning convex part 74 protrudes along the z direction, and the z-direction view shape is, for example, a circular shape.

  The plurality of positioning recesses 17 are formed in the base material 10 of the print substrate 1. The positioning recess 17 is recessed from the back surface 12 of the substrate 10. More specifically, the positioning recess 17 is recessed along the z direction, and the shape viewed in the z direction is, for example, a circular shape. Each positioning convex part 74 has entered into each positioning concave part 17, and is more preferably fitted.

  In the present embodiment, the plurality of positioning protrusions 74 and the plurality of positioning recesses 17 include ones that are spaced apart in the x direction. Further, the plurality of positioning convex portions 74 and the plurality of positioning concave portions 17 include ones that are spaced apart in the y direction. In the illustrated example, four positioning convex portions 74 and four positioning concave portions 17 are arranged at the four corners when viewed in the z direction. In the present embodiment, the illustrated bonding layer 75 may be used as means for bonding the base material 10 to the heat dissipation member 7. The bonding layer 75 is an adhesive, an adhesive tape, or the like, and one that can be peeled by the user or manufacturer should be selected.

  Also according to such an embodiment, the disposal burden due to the thermal print head A5 can be reduced.

  The thermal print head according to the present invention is not limited to the above-described embodiment. The specific configuration of each part of the thermal print head according to the present invention can be varied in design in various ways.

Claims (24)

  1. A printed circuit board having a plurality of heating portions arranged in the main scanning direction;
    A heat dissipating member;
    A connector board provided with a main connector for connection to the outside of the machine,
    The printed circuit board is removable with respect to the heat dissipation member,
    A thermal print head comprising position defining means for defining a position of the print substrate in a sub-scanning direction with respect to the heat radiating member.
  2.   The thermal print head according to claim 1, further comprising a driver IC mounted on the print substrate.
  3.   The thermal print head of Claim 2 provided with the subconnector which conducts the said printed circuit board and the said connector board | substrate.
  4.   4. The thermal print head according to claim 3, wherein the position defining means includes a contact surface provided on the heat radiating member and located downstream of the print substrate in a sub-scanning direction.
  5.   The thermal print head according to claim 4, wherein the contact surface is inclined so as to cover a downstream end surface in a main scanning direction of the print substrate in a plan view.
  6.   The thermal print head according to claim 5, wherein the downstream end surface of the print substrate in the main scanning direction is parallel to the contact surface.
  7.   The thermal print head according to claim 4, wherein the position defining means includes a biasing mechanism that biases a pressing force that causes the print substrate to abut against the abutting surface.
  8.   8. The thermal print head according to claim 4, wherein the position defining means includes a connector board elastic member for attaching the connector board to the heat radiating member. 9.
  9.   The thermal print head according to claim 8, wherein the connector board elastic member biases the pressing force through the connector board.
  10.   The thermal print head according to claim 7, wherein the urging mechanism includes an intermediate elastic member interposed between the print substrate and the connector substrate.
  11.   The said position prescription | regulation means is a positioning recessed part provided in the said printed circuit board, and the positioning convex part provided in the said heat radiating member, and approaching into the said positioning recessed part, The one in any one of Claim 4 thru | or 6 Thermal print head.
  12.   The thermal print head according to claim 11, wherein the position defining means includes a plurality of positioning concave portions and a plurality of positioning convex portions.
  13.   The thermal print head according to claim 12, wherein the plurality of positioning concave portions and the plurality of positioning convex portions include those that are separated from each other in the main scanning direction.
  14.   The thermal print head according to claim 12 or 13, wherein the plurality of positioning concave portions and the plurality of positioning convex portions include ones that are separated from each other in the sub-scanning direction.
  15.   The thermal print head according to claim 11, wherein the positioning recess is recessed in the thickness direction of the print substrate, and the positioning protrusion protrudes in the thickness direction of the print substrate.
  16. The thermal print head according to claim 3, further comprising a flexible wiring board that connects the sub-connector and the connector board.
  17. The printed circuit board includes a base material, a glaze layer supported by the base material, and a wiring layer formed on the glaze layer.
    17. The thermal print head according to claim 1, wherein the wiring layer includes a resistor layer constituting the plurality of heat generating portions and an electrode layer conducting to the resistor layer.
  18. The wiring layer is formed by a thin film forming method,
    The thermal print head according to claim 17, wherein the resistor layer is interposed between the wiring layer and the glaze layer.
  19. The wiring layer is formed by firing a thick-film printed paste,
    The thermal print head according to claim 17, wherein the resistor layer has a strip shape extending long in the main scanning direction.
  20.   The printed circuit board includes a substrate made of a semiconductor, an insulating layer formed on the substrate, an electrode layer formed on the insulating layer, and a wiring layer made of a resistor layer, and the resistor layer includes the plurality of resistor layers. The thermal print head in any one of Claims 1 thru | or 16 which comprises these heat-emitting parts.
  21.   21. The thermal print head according to claim 20, wherein the semiconductor is made of a material selected from any one of Si, SiC, AlN, GaP, GaAs, InP, and GaN.
  22. The thermal print head according to claim 20 or 21, wherein the insulating layer is made of SiO 2 or SiAlO 2 .
  23. 23. The thermal print head according to claim 20, wherein the resistor layer is made of at least one of polysilicon, TaSiO 2 , and TiON.
  24.   The thermal print head according to any one of claims 20 to 23, wherein the electrode layer is made of at least one of Au, Ag, Cu, Cr, Al-Si, and Ti.
JP2016569472A 2015-01-16 2016-01-13 Thermal print head Active JP6618932B2 (en)

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JP2015006580 2015-01-16
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JPS6067934U (en) * 1983-10-15 1985-05-14
JP2538778Y2 (en) * 1990-08-31 1997-06-18 京セラ株式会社 Image forming device
JP3228974B2 (en) * 1990-12-19 2001-11-12 ローム株式会社 Line type thermal print head
JP2989024B2 (en) * 1991-03-13 1999-12-13 株式会社リコー Thermal head unit
JP3101394B2 (en) * 1992-01-31 2000-10-23 ローム株式会社 Printer unit and thermal head including the same
CN1050805C (en) * 1992-01-31 2000-03-29 罗姆股份有限公司 Printing head and printer imorporating the same
JPH05212886A (en) * 1992-02-04 1993-08-24 Seiko Epson Corp Thermal recorder
JPH07205463A (en) * 1994-01-18 1995-08-08 Rohm Co Ltd Method for sticking head substrate in thermal print head
CN1076287C (en) * 1995-08-09 2001-12-19 罗姆股份有限公司 Thermal print head
JPH09207367A (en) * 1996-02-02 1997-08-12 Graphtec Corp Thermal head
JP2000238306A (en) * 1999-02-22 2000-09-05 Graphtec Corp Thermal head
JP2008023939A (en) * 2006-07-25 2008-02-07 Toshiba Hokuto Electronics Corp Thermal head
JP6178669B2 (en) * 2012-08-29 2017-08-09 ローム株式会社 Thermal print head and thermal printer
JP5955979B2 (en) * 2012-11-20 2016-07-20 京セラ株式会社 Thermal head and thermal printer equipped with the same

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JP6618932B2 (en) 2019-12-11
WO2016114289A1 (en) 2016-07-21
CN107107625A (en) 2017-08-29

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