JPH088826Y2 - Long thermal head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a thermal head used in a facsimile, a printer, etc., and more particularly to a long thermal head having a plurality of resistor substrates arranged and fixed in the longitudinal direction. is there.

(Prior Art) For example, when a long thermal head of A4 size or B4 size is formed on one long substrate by a thin film process, the manufacturing yield decreases as the substrate size increases, and the thermal head becomes expensive. It becomes a thing.
Therefore, in order to improve the yield, there has been adopted a method of connecting short resistor substrates in the longitudinal direction to form a long thermal head.

(Problems to be solved by the invention) When a short resistor substrate having a heating resistor formed on its surface is arranged and fixed in the longitudinal direction on a support plate, the resistor substrate is bonded at the joint between the resistor substrates. A step is generated due to a difference in thickness and a difference in height adjustment when fixing the support plate. This step is
Usually, it is difficult to suppress the thickness to 5 μm or less.

If a step is formed at the joint between the resistor substrates, there is a difference in contact pressure with the thermal recording paper or thermal transfer paper at the step, and there is a problem that print quality is deteriorated.

An object of the present invention is to provide a long thermal head having a mechanism for reducing a step difference at a joint portion of a long thermal head in which a plurality of resistor substrates are arranged and fixed in a longitudinal direction on a support plate. Is.

(Means for Solving the Problems) In the present invention, the resistor substrate joint portion of the support plate penetrates from the front surface of the support plate to the back surface, extends from one end of the support plate to the middle in the width direction, and is connected under the resistor substrate joint. A groove having at least a slit portion to be positioned was provided, and the fixing plate was provided with a mechanism for adjusting the height of the support plate for each unit partitioned by the slit portion at a position sandwiching the slit portion.

(Operation) After assembling the thermal head by fixing the resistor board and the support plate, and between the support plate and the fixed plate, while measuring the step of the joint part of the resistor board with a measuring instrument or printing, The support mechanism is displaced in the groove portion by the adjusting mechanism to reduce the step difference at the joint portion of the resistor substrate.

(Embodiment) FIG. 1 shows a support plate in one embodiment.

A groove 2 is provided in the support plate 1 at a position where a joint portion of a resistor substrate which is adhered and fixed thereon is located.
The groove 2 is a groove that penetrates from the front surface to the back surface of the support plate 1,
It has a character shape. Reference numeral 2a is a slit portion of the groove 2, and the slit portion 2a extends from one end of the support plate 1 partway in the width direction. One end of the slit portion 2a is connected to the groove portion 2b extending in the longitudinal direction of the support plate 1.

With this groove 2, the portions 3a and 3b sandwiching the slit portion 2a can be displaced in a direction perpendicular to the surface of the support plate 1.

FIG. 2 shows a state in which two resistor substrates 4a and 4b are adhered and fixed on the support plate 1.

The resistor substrates 4a and 4b and the support plate 1 are positioned so that the joints 5 at the end sides of the two resistor substrates 4a and 4b are on the slits 2a of the groove 2.

 FIG. 3 is a front view of the main part of FIG.

There is a difference in thickness between the resistor substrate 4a and the resistor substrate 4b, and for example, the resistor substrate 4b is thicker. In the state where the resistor substrates 4a and 4b are adhered to the support plate 1, a step due to the difference in thickness of the resistor substrates 4a and 4b occurs at the joint portion 5.

FIG. 4 shows a state in which the support plate 1 to which the resistor substrates 4a and 4b are adhered is fixed to the fixing plate 6 with a fixing screw (not shown), and the height of the surface of the resistor substrates 4a and 4b is adjusted. There is.

The fixed plate 6 is provided with screw holes 7a and 7b at positions where it sandwiches the slit portion 2a of the groove of the support plate 1. Adjustment screws 8a and 8b for height adjustment are respectively screwed into the screw holes 7a and 7b from the lower side of the fixed plate 6, and the tips of the adjustment screws 8a and 8b are the portions 3a of the support plate 1.
By making contact with 3b, the height of the surfaces of the resistor substrates 4a, 4b can be adjusted. Screw hole 7
The a and 7b and the adjusting screws 8a and 8b form a height adjusting mechanism.

The height of the surfaces of the resistor substrates 4a and 4b is determined by adhesively fixing the resistor substrates 4a and 4b and the supporting plate 1 and fixing the supporting plate 1 and the fixing plate 6 with a fixing screw. Adjust while measuring the surface of 4a, 4b with a surface roughness meter, or while performing printing operation.

5 and 6 show examples of other shapes of the groove 2 of the support plate 1.

FIG. 5 shows that the groove 2 has only a slit portion, and FIG. 6 shows that the circular hole is provided at one end of the slit portion. Since the height adjustment at the joint is very small, such as several μm, the purpose can be achieved even with the groove 2 shown in FIG. 5 or FIG.

As an example of the material of each member, an aluminum plate or a stainless plate can be used as the support plate 1, alumina ceramics or the like can be used as the resistor substrates 4a and 4b, and the fixing plate 6 can be used. Can be an aluminum plate or a stainless plate.

The embodiment of FIG. 2 shows an example of a thermal head in which two resistor substrates 4a and 4b are joined together, but the same is true when three or more resistor substrates are joined together. The groove 2 as shown in FIG. 1, FIG. 5 and FIG. 6 is provided in the resistor substrate joint, and the adjusting screws 8a and 8b are attached with the slit portion of each groove 2 sandwiched between the resistor substrate surface. The height may be adjusted for each joint.

(Effect of the Invention) In the thermal head of the present invention, the support plate penetrates from the front surface of the support plate to the back surface of the support plate, extends from one end of the support plate to the middle in the width direction, and under the resistance substrate connection. A groove having at least a slit portion located is provided, and a fixing plate is provided with a mechanism for adjusting the height of the support plate for each unit partitioned by the slit portion at a position sandwiching the slit portion, and Since the surface height at the joint can be adjusted, it becomes easy to adjust the step amount to 5 μm or less.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a support plate of one embodiment, FIG. 2 is a perspective view showing a state where two resistor substrates are bonded on the support plate in one embodiment, and FIG. 2 is a front view of an essential part of FIG. 2, FIG. 4 is a cross-sectional view of the essential part of one embodiment, and FIGS. 5 and 6 are plan views of the essential parts showing the groove shapes of the supporting plate in another embodiment. 1 ... Support plate, 2 ... Groove, 2a ... Slit part, 4a, 4b ...
... resistor substrate, 5 ... joint, 6 ... fixing plate, 7a, 7b ...
… Screw holes, 8a, 8b …… Adjusting screws.

Claims (1)

[Scope of utility model registration request] 1. A long thermal head comprising a support plate fixed to a fixed plate, and a plurality of resistor substrates having heating resistors formed on the surface thereof arranged in the longitudinal direction and fixed, wherein: The resistor substrate joint portion is provided with a groove penetrating from the front surface to the back surface of the support plate, extending from one end of the support plate to the middle in the width direction, and having at least a slit portion located below the resistor substrate joint portion, and the fixing. The plate is provided with a mechanism for adjusting the height of the support plate for each unit partitioned by the slit portion at a position sandwiching the slit portion.