JPH0321962Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a thermal print head.

Since thermal print heads generate heat during use, they are usually used while being attached to a heat sink such as an aluminum plate.

FIG. 1 is an explanatory diagram showing a state in which a conventional thermal print head is attached to a heat dissipation plate, and FIG. 1A is a perspective view thereof, and FIG. 1B is a partial sectional view.
In Fig. 1, reference numeral 1 denotes a head body of a thermal print head, and this head body 1 has a heating element (not shown) and its wiring formed on a rectangular ceramic substrate by printing, and its surface is covered with the exception of external connection terminals. covered with a protective film. 2 is a heat sink made of, for example, a surface-treated aluminum plate;
The head body 1 is adhered and fixed to the heat radiation plate 2 with, for example, an epoxy adhesive 3.

However, in the case of the conventional heat sink, when the head body 1 is attached as described above, excess adhesive is squeezed out and a raised portion 3' is formed on the side of the head body 1 as shown in FIG. 1B. occurs. The raised part 3' of this adhesive is the surface of the head body 1 (especially the heating element).
This prevents good adhesion between the paper and the thermal paper (not shown), resulting in poor printing. Therefore, since such raised portion 3' must be removed, the conventional heat sink has the disadvantage of complicating the manufacture of the thermal printer.

Furthermore, the conventional heat sink 2 has the disadvantage that it is difficult to position the head body 1 because it does not have a positioning means for attaching the head body 1, and therefore the attachment position of the head body 1 is likely to vary. ing.

The present invention has been devised to eliminate the above-mentioned drawbacks, and its object is to provide a thermal print head in which excess adhesive does not ooze out when the head body is attached.

Another object of the present invention is to provide a thermal print head that allows easy, quick, and accurate positioning of the head body when it is attached.

To this end, the thermal print head according to the present invention has a recess formed in the longitudinal direction of the surface of the heat dissipation plate with a width larger than the width of the head main body and a depth shallower than the thickness of the head main body, and the bottom surface of the recess The device is characterized in that a thin groove with a U-shaped cross section is formed on both sides and extends parallel to the surfaces on both sides, and the head main body is adhered to the bottom surface of the recess via an adhesive.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an explanatory view of the thermal print head of this embodiment, in which A is a perspective view and B is a partial sectional view thereof.

In FIG. 2, reference numeral 1 denotes a head body, which is the same as the head body shown in the conventional example of FIG. Reference numeral 4 denotes a heat sink, which is made of, for example, a surface-treated aluminum plate. Reference numeral 5 denotes a recess provided on the surface of the heat dissipation plate 4 in its length direction, and this recess is formed to have a width slightly larger than the width of the head main body 1 and a depth shallower than the thickness of the head main body 1. A narrow groove 6 having a U-shaped cross section is provided on both sides of the bottom surface of the recess 5 and extending parallel to both surfaces. The head body 1 is adhered to the bottom surface of a recess 5 provided in the heat sink 4 with an adhesive 3 interposed therebetween.

Next, the operation of this embodiment will be explained. The head body 1 is fitted into the recess 5 of the heat sink 4 and positioned quickly and accurately, and an adhesive 3 is applied to the bottom of the recess 5.
It is pasted with. Then, the excess adhesive 3 is removed from the narrow groove 6.
and accumulates in the narrow groove 6. For example, if the narrow groove 6 is formed longer than the length of the head body 1,
Even if there is an extremely large amount of excess adhesive 3, it can be sufficiently accommodated within this narrow groove 6.

Therefore, in the thermal print head of the present invention, excess adhesive does not protrude and create adhesive bulges on the sides of the head body.
Further, since the head body is positioned by fitting the head body into the recess of the heat sink, the head body can be positioned quickly and accurately.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a state in which a conventional thermal print head is attached to a heat dissipation plate, and FIG. 1A is a perspective view thereof, and FIG. 1B is a partial sectional view.
FIG. 2 is an explanatory view of the thermal print head of this embodiment, in which A is a perspective view and B is a partial sectional view thereof. 1... Head main body, 3... Adhesive, 4... Heat sink, 5... Recess, 6... Thin groove.

Claims (1)

[Scope of utility model registration request] A recess provided on the surface of the heat dissipation plate along its length, the width of the recess being slightly larger than the width of the head body attached to the bottom of the recess, and the depth of the recess being is shallower than the thickness of the head body, and is further provided on both sides of the bottom surface in the width direction of the recessed portion with a U-shaped cross section extending parallel to both surfaces, and an adhesive is applied to the bottom surface of the recessed portion. A thermal print head, characterized in that the head body is attached to the head body.