JP2600012B2 - Manufacturing method of print head heat sink - Google Patents

Abstract

PURPOSE:To stabilize the warpage value of a heat release board and reduce the number of processes in assembling a print head by a method wherein a material of heat release boards is extruded and machined into a warped planar material using a die having a warped open part shaped to have a cross section of a heat release board along a print head printing element alignment direction, and the planar material is cut at a surface vertical to the extrusion direction into heat release boards. CONSTITUTION:An open part 6a of a die 6 is so shaped as to have a cross section in a direction D along a printing element alignment of a print head heat release board and a warpage (v). A dimension (t) is corresponding to the thickness of the heat release board. A dimension (l) is corresponding to the length of the heat release board in a printing element alignment direction (longitudinal direction) D. An aluminum alloy (billet) 7 as a material of the heat release boards is contained in a cylindrical container 11 and pressed by a ram 8. The die 6 is fixed to the container 11 with a presser member 10. The billet 7 is extruded from the open part 6a to be machined to a shield-form planar material 9. The extruded and machined planar material 9 is cut along a surface vertical to an extrusion direction E at predetermined intervals (b) into separate heat release boards 1.

Description

The present invention relates to a method for manufacturing a radiator plate applied to a thermal print head, an LED print head, and the like.

(B) Conventional technology A print head, for example, a thermal print head,
As shown in FIG. 4, a rectangular narrow ceramic substrate 2 and a flexible substrate 3 connected to pattern electrodes of the ceramic substrate 2 are placed on an auxiliary substrate 5 on the upper surface of a rectangular heat dissipation plate 1 made of an aluminum alloy. The heat sink 1 is pressed and fixed to the heat sink 1 by the pressing cover 4 from above.

The flexible substrate 3 is electrically connected to an external control circuit via a connector (not shown), and generates heat by applying a voltage to the selected low heat antibody in the low heat antibody row on the ceramic substrate 2. The resistor generates heat. Then, printing is performed by causing dots to be colored on the thermosensitive recording paper fed between the heat-generating low antibody row and the opposing platen roller.

In the thermal print head, printing is performed by the heat generated by the heating resistor as described above. Therefore, the frequency of use or long-time use increases the overall temperature. However, among the constituent members of the thermal print head, the aluminum alloy radiator plate 1 has a high coefficient of thermal expansion, while the ceramic substrate 2 hardly thermally expands. The ceramic substrate 2
Since the central portion is adhered to the heat sink 1 and pressed down by the cover 4 to be integrated, if it is flat at normal temperature, when the temperature rises, the thermal print head becomes as shown in FIG. In a concave shape. Such a concave shape causes a gap between the platen and the row of heating resistors at the center of the thermal print head, resulting in poor print quality.

Therefore, in anticipation of concave warpage due to temperature rise, the sixth
As shown in the figure, the thermal print head is assembled so as to be convex at normal temperature. In this case, it is necessary to warp the heat sink 1 before assembling.

Conventionally, as shown in FIG. 7, the heat radiating plate 1 is extruded using a die 6 ′ having an opening having a cross-sectional shape orthogonal to the exothermic low antibody array (the direction D of the exothermic resistor array and the extruding direction). E matches). The extruded material is a long bar-shaped plate material 9 ', which is cut in accordance with a required printing width. At this stage, since the heat radiating plate 1 is flat, it is applied to a leveler, and a force is applied to a central portion to give a required value of warping as shown in FIG.

(C) Problems to be Solved by the Invention As a material of the heat sink of the print head, an aluminum alloy is often used as described above. However, since the aluminum alloy is easily deformed, the above method has a problem that the warpage value varies and is not stable. Also,
There is also a problem that a step of giving a warp to the heat sink is required, and the number of steps of assembling the print head is increased.

The present invention has been made in view of the above, and has a stable warpage value and can reduce the number of print head assembly steps.
It is an object of the present invention to provide a method of manufacturing a print head heat sink. (D) Means and Action for Solving the Problems In order to solve the above problems, a method of manufacturing a print head heat sink according to the present invention comprises: Extrusion of the heat sink material using a die with a cross-sectional shape along the heat sink and an opening with a warped shape,
It is continuously formed into a long plate having a warp, and this plate is cut along a plane perpendicular to the extrusion direction to form a heat sink.

In the method of manufacturing a heat radiating plate for a print head according to the present invention, the warpage is given at the stage of the extrusion process, so that the warpage value is stabilized. Further, since it is not necessary to separately provide the heat sink with a warp, the number of print head assembling steps can be reduced.

(E) Embodiment One embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows a die 6 applied to this embodiment. The shape of the opening 6a of the die 6 is a cross section in the direction D along the print element row of the print head heat sink, and has a shape with a warp v.

t corresponds to the thickness of the heat sink, and l corresponds to the length of the heat sink in the printing element row direction (longitudinal direction) D. For example, if t is 5 to 10 mm and l is 200 to 300 mm, v is 0.05 to 0.1 m
It is set to about m.

FIG. 2 shows an extrusion process using the die 6. An aluminum alloy (billet) 7 as a material of the heat radiating plate is put in a cylindrical container 11 and pressed by a ram 8 from the left side of FIG. The container 11 has a holding member 10
As a result, the die 6 is fixed, and the billet 7 is extruded from the opening 6a to be processed into a shield-shaped plate material 9 as shown in FIG. In addition to the extrusion, a pulling force may be applied to the tip of the plate material 9 in the right direction on the paper of FIG.

The extruded plate material 9 is cut along a plane perpendicular to the extrusion direction E with a predetermined width b as shown in FIG.

A print head can be assembled using the radiator plate 1 thus formed. In the case of a thermal print head, a ceramic substrate is bonded to the convex surface 1a of the radiator plate 1 after screw hole processing, and an auxiliary substrate and a flexible substrate are mounted. And attach the cover.

(F) Effects of the Invention As described above, in the method of manufacturing a print head heat sink of the present invention, the die having the cross-sectional shape of the heat sink along the print head print element row direction and having a warped shape opening. By extruding the heatsink plate material and continuously forming it into a long plate with warpage, this plate is cut along a plane perpendicular to the extrusion direction to form a heatsink. This has the advantage that the warpage value of the plate is stabilized and the number of steps for assembling the print head can be reduced.

[Brief description of the drawings]

1 to 3 are views for explaining an embodiment of the present invention. FIG. 1 is a view showing a die applied to this embodiment, and FIG. 2 is an extrusion using the same. FIG. 3 is a diagram for explaining processing, FIG. 3 is a diagram for explaining cutting of a plate material obtained by this extrusion, FIG. 4 is an external perspective view of a general thermal print head, and FIG. FIG. 6 illustrates a state in which the head is curved in a concave shape, and FIG.
FIG. 7 is a diagram illustrating a state in which the thermal print head is provided with a convex curve, FIG. 7 is a perspective view illustrating extrusion processing of a conventional heat sink, and FIG. 8 is a state in which a conventional heat sink is warped. FIG. 1: heat sink, 6: die, 6a: die opening, 9: plate material, E: extrusion direction, D: printing element row direction, v: warpage value.

Claims (1)

(57) [Claims] 1. A heat sink material is extruded by using a dice having a cross-sectional shape of a heat sink along a print head printing element row direction and having an opening having a warped shape, and a long shape having a sled is formed. A method for manufacturing a print head radiator plate which is continuously formed on a plate member, and the plate member is cut along a plane perpendicular to the extrusion direction to form a heat sink.