JPS62179958A - Thermal head temperature detector - Google Patents

Abstract

PURPOSE:To obtain a temp. detector correcting mechanism capable of omitting a means for correcting the output of a temp. detector and having a simpler structure, by making the support of the temp. detector longer than the substrate of a thermal head and arranging the temp. detector in the regional area of the substrate of the thermal head. CONSTITUTION:A support 50 is extended to suppress that the effect due to the heat dissipating effect at the end surface thereof is exerted on a temp. detector 42. By this structure, the output 101' of the temp. detector 42 at a terminal point can be made almost equal to the output 100 of a temp. detector 41 not present at the terminal point and the difference 110' between both outputs can be made sufficiently small as compared with difference 110. According to this embodiment, the same heat dissipating characteristic can be provided with respect to the quantity of heat transmitting from the heat generator of a thermal head at all positions of the support 50 and, therefore, there is effect such that it is unnecessary to provide the correction table of the output of the temp. detector at the terminal point and that of the temp. detector not present at the terminal point. Further, a means for making the heat dissipating characteristic the same can be realized by deforming the shape of the support in the periphery of the temp. detector not present at the terminal point or by changing the material quality of the supports in the peripheries of the temp. detectors present at the terminal point and not present at said point.

Description

[Detailed Description of the Invention] [Summary] The present invention has a plurality of temperature detectors placed near the thermal head in order to detect the temperature around the thermal head. In order to eliminate the difference in the detector output between the end point and other points due to the relative size, and to make the heat dissipation effect of the temperature detector support the same, the support of the temperature sensor is attached to a Thermage bed board. By making the structure longer, highly accurate temperature detection is achieved.

[Industrial application field]

The present invention relates to a method for correcting the temperature around a thermal head heating element.

As is well known, a thermal recording device performs recording by applying a predetermined electric signal to a thermal head to generate Joule heat. In an ideal case, it would be desirable to consume all of the heat generated here, but in reality, some of it is transmitted through the thermal head substrate and its support and radiated. Generally, these are larger than thermal heads and store this amount of heat internally. As a result, the ambient temperature of the thermal head recording paper increases, which greatly affects the recording quality.

For this reason, a means for highly accurately detecting the amount of heat stored around the thermal head is required.

[Conventional technology]

FIG. 2 shows a principle diagram of a conventional thermal head temperature detection correction method in which a correction table is provided for each detector position. The heat generated by the thermal head heating element 32 passes through the thermal head substrate 31ft and then reaches the support 14.30ft.
The temperature is detected by temperature detectors 1 to 6 embedded inside. 11-16 converts this detected quantity into an electrical quantity.

Regarding temperature detectors 2 to 5, simply refer to temperature detectors 12 to 1.
5 converts only electrical quantities. In addition, regarding the temperature detection circuit and 6 placed at the end points, after the same conversion, the difference between the heat dissipation effect of the temperature detectors 2 to 5 is calculated using the correction table 21.
, 22.

Here, we will explain the temperature distribution that is subject to correction.
゜ Fig. 3 (a) is a diagram showing the relationship between the conventional temperature sensor and the support 30, and Fig. 3 (bl is a distribution diagram showing the temperature distribution state. The temperature detector output 100 is not an end point. The temperature detector output 101 represents the detected amount from the temperature detector 41, and the temperature detector output 101 represents the detected amount from the temperature detector 42 at the end point. , the temperature sensor output 101 of the temperature sensor 42 is greatly affected by the heat dissipation effect at the end surface of the support body 30, and the temperature sensor output 101 of the temperature sensor 42 is
The temperature is 1 ul lower than the temperature sensor output 100.

[Problem that the invention seeks to solve]

In the conventional thermal correction method, the difference in heat dissipation characteristics between the temperature sensor placed at the end point and other temperature sensors is corrected using a correction tape and, for example, memory, so the temperature detection It is necessary to modify the correction table due to the complexity of the circuit, the difference in the physical shape of the thermal head, etc. [Means for solving the problem] The thermal head temperature detection mechanism of the present invention It consists of a temperature detector support and a temperature detector that have the same heat dissipation characteristics for the amount of heat transmitted from the heating element at every position of the detector support. To achieve this, the temperature detector support is made longer than the thermal head substrate.

[Effect]

Since the influence of heat radiation can be eliminated, differences in heat dissipation effects around individual temperature sensors can be eliminated.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.

In the present invention, the support body 50 in FIG. 3 as a conventional example is replaced by 50
', the temperature sensor 42 is suppressed from being affected by the heat dissipation effect at the end face. With this structure,
The temperature sensor output 101' of the temperature sensor 42 at the end point can be made approximately equal to the direct skin detection output 1flO of the temperature sensor 41 that is not at the end point, and the difference Ill etc. can be expressed as 11 in FIG.
It can be made sufficiently smaller than 0. According to this embodiment, all positions of the support body can have the same heat dissipation characteristics for the amount of heat transmitted from the thermal head heating element, so there is no need to provide a correction table for the end points and the output of the temperature sensor that does not have the end points. There is an effect that there is no.

Further, as means for making the heat dissipation characteristics the same, it can also be realized by changing the shape of the support around the temperature sensor that is not at the end point, or by changing the material of the support around the end point and the temperature sensor that is not at the end point.

〔Effect of the invention〕

According to the present invention, the shape and material of the support of the temperature sensor equalizes the amount of heat transmitted from the heating element to the thermal, so the means for correcting the output of the temperature sensor can be eliminated, resulting in a simpler structure. A temperature sensor correction mechanism with the following is obtained.

[Brief explanation of drawings]

1st! "4 shows one embodiment of the present invention, and FIGS.
The figure shows a conventional example. In the figure, 41.42 and 1 to 6 are temperature detectors, 50.5 (1', , 30 is a support body, 32 is a thermal head heating element, 31 is a thermal head board, and 11 to X6 are temperature detector output conversions. Vessel, 21-2
2 is a correction table; 50. :IO is a support.

Claims (1)

[Claims] In a temperature detector that detects the amount of heat accumulated around the thermal head, a plurality of temperature detectors are provided around the thermal head, and the support body 50 of the temperature detector is attached to the thermal head substrate (31
) A thermal head temperature detector characterized in that the temperature detector is longer than that in the thermal head substrate (31) and the temperature detector is disposed within the area of the thermal head substrate (31).