JP2009300090A - Irreversible temperature sensitive and moisture sensitive sensor - Google Patents

Abstract

It is highly probable that a precision electronic device such as a mobile phone will fail if it exceeds a limit temperature or humidity, and is left on a dashboard of a car under hot weather, submerged, or submerged. It is strictly forbidden to bring it into the sauna bath, but when a failure occurs due to these actions, the cause could not be clearly identified, and there were many cases where it was subject to complaint repair or not. However, there were no compact sensors that could detect these simultaneously.
[Constitution] A temperature sensing body made of a thermosensitive material that is opaque at room temperature, which is a mixture of a powdery wax that melts at a preset temperature and a thickener, and when a preset relative humidity is exceeded. An irreversible temperature-sensitive moisture sensor was constructed by arranging a moisture-sensitive body that irreversibly displays the fact on the same substrate.
[Selection] Figure 2

Description

  The present invention relates to a temperature-sensitive sensor, and more particularly to a seal-like sensor that can irreversibly display both the fact that a set temperature is exceeded and the fact that a set relative humidity is exceeded.

  The irreversible temperature sensor in the form of a seal can be easily applied to the desired part of various devices, can be applied to a narrow space, and does not require a power source. Widely used in the field.

  In addition, the irreversible humidity sensor with a seal that irreversibly displays the fact that the preset relative humidity has been exceeded is used in various industrial fields for humidity management of various devices such as humidity management during transportation by ship. Widely used.

  On the other hand, in precision electronic equipment such as mobile phones, if exposed to high temperatures exceeding the limits and high humidity exceeding the limits, it is unavoidable that a serious failure will occur in the function, and the dash of a car under hot weather is inevitable. As is well known, it is strictly prohibited to bring on board or in a hot and humid sauna bath. Needless to say, even when submerged or submerged, a serious failure occurs in the function.

  And in the case of these devices, when a failure occurs, there are cases where the manufacturer must be responsible for repairs as a subject of claims, and cases where the manufacturer is exempted as a result of incorrect use. In some cases, there was a dispute between the manufacturer and the user.

In the case of a failure due to an impact at the time of dropping, there are often traces left outside of these devices, and it is easy to identify the responsibility, but failure when exposed to a high temperature atmosphere, that is, high temperature failure or high Failure due to exposure to humidity, that is, high-humidity failure, hardly changes in appearance, making it difficult to find the cause, making it difficult to find the responsibility for the failure, and overcoming the burden of repair. It was easy to get into trouble.
JP2002-111833 JP 2006-29945 A None

  For this reason, a humidity sensor that irreversibly displays the fact that the preset relative humidity has been exceeded, or a temperature sensor that irreversibly displays the fact that the preset temperature has been exceeded, is also an inconspicuous part inside these devices. If they are pre-installed and checked at the time of repair request, the cause of the failure can be clearly identified and the responsibility clarified, so some attempts have been made to install these sensors.

  However, the humidity sensor detects the atmospheric humidity of these devices, so it naturally has hygroscopicity, whereas the temperature sensor is often sensitive to humidity and humidity. It was actually quite difficult to work in parallel.

  Many conventional temperature sensors in the form of seals use the thermal melting action of wax and chemical substances, which are melted by heat and penetrated into masking material such as Japanese paper, making the masking material transparent. By making the chromatic surface located below visible, the fact that the set temperature has been exceeded is visually displayed.The masking material is vulnerable to moisture, and when exposed to high humidity, the masking material In some cases, moisture was sucked in and transparent, resulting in erroneous color development.

  On the other hand, many sheet-type moisture sensors fix a deliquescent substance colored on a hygroscopic sheet-like base material, and the substance liquefies and exudes to the surroundings when the set temperature is exceeded. Therefore, the fact that the set humidity is exceeded is displayed visually and irreversibly, and it is indispensable for the base material to have hygroscopicity. Therefore, if the temperature sensor using the heat melting phenomenon of the above-mentioned wax or chemical substance is fixed adjacent to the substrate of the moisture sensor where moisture absorption is indispensable, the temperature sensor may be mistaken for humidity. There is a high possibility of causing the operation, and in the conventional one, it has been said that it is actually difficult to achieve both.

  As a result of research conducted by the present inventors to install a moisture sensor and a temperature sensor on the same base material so that they can be mounted inside a precision electronic device such as a mobile phone having only a small mounting space. The present inventors have succeeded in developing an irreversible temperature and humidity sensor that can realize this, and propose it as the present invention.

  A thermosensitive material made of a thermosensitive material that is opaque at room temperature, which is a mixture of powdery wax that melts at a preset temperature and a thickener, and the fact that the preset relative humidity is exceeded is irreversible. The above-described problems have been solved by arranging an irreversible temperature-sensitive moisture sensor by arranging a moisture-sensitive body to be displayed on the same substrate.

  A pressure-sensitive adhesive layer and an adhesive layer are provided on the back surface of the base material, and are fixed in advance to an inconspicuous part inside various devices such as a mobile phone. The temperature sensor formed on the base material is When the preset limit temperature is exceeded, the powdery wax melts and becomes transparent, and the color surface that has been hidden under it until now can be seen through from above. It appears as if it had developed color, thereby displaying the fact that the limit temperature has been exceeded. After that, even if the temperature drops, once the wax becomes transparent, the fact that it exceeds the limit temperature continues to be displayed irreversibly because it does not return to opaque. On the other hand, when the limit humidity is exceeded, the moisture sensitive body formed on the base material liquefies, and a circular mark appears by oozing out into the base material around the moisture sensitive body. This will visually display the fact that the limit humidity has been exceeded. Since this circular mark does not disappear or shrink even if the humidity subsequently decreases, the fact that the limit humidity has been exceeded continues to be displayed irreversibly.

  The temperature sensing element in this invention uses the heat melting action of powdered wax that is opaque at room temperature. Like conventional wax-based temperature sensing elements, the phenomenon of wax soaking into masking materials such as Japanese paper Because it is not used, even if it is strong in water, exposed to high humidity, or submerged, the temperature sensing element does not cause a false color operation and can continue to operate normally.

  In this way, in this irreversible temperature and humidity sensor, the temperature sensor formed on the sensor is resistant to moisture, so it is possible to have both the temperature sensor and the humidity sensor on the same substrate. Therefore, it can be securely installed inside a precision electronic device such as a mobile phone that has only a small installation space. If it is left on the dashboard of a car under hot weather, submerged, or brought into a sauna bath. In such cases, it is possible to clearly identify the cause of failure that the user must take responsibility for, and to effectively carry out product management and after-sales service.

  The greatest feature exists in that a temperature sensitive body utilizing the heat melting action of powdered wax is formed on a common substrate together with a moisture sensitive body.

  1 is an enlarged perspective view of Example 1 of an irreversible temperature / humidity sensor according to the present invention, FIG. 2 is an enlarged cross-sectional view thereof, and FIG. 3 exceeds a set temperature and a set humidity. FIG. 4 is an enlarged perspective view showing the situation when the fact is detected, and FIG. 4 is a front view of the mobile phone attached.

  In the figure, reference numeral 1 denotes a sheet-like base material made of hygroscopic paper or the like. A colored paper 2 having an arbitrary planar shape is fixed on the base material 1 with the color surface 3 facing upward, and a wax that melts at an arbitrary preset temperature is powdered thereon. A temperature-sensitive material 4 made of a pulverized product and an appropriate amount of a thickening agent and coated with an opaque temperature-sensitive material 4 at room temperature is coated with a transparent film 5 to form a temperature-sensitive body 6. The temperature sensing element 6 is exactly the same as that proposed by the present applicant as Japanese Patent Application No. 2004-208311 (Japanese Patent Laid-Open No. 2006-29945). Alternatively, the temperature sensitive body 6 may be formed by partially coloring the base material 1 without using the colored paper 2 and superposing the temperature sensitive material 4 thereon.

  On the other hand, a colored deliquescent material that liquefies at a preset relative humidity is applied in a spot form on the substrate 1 with a slight gap from the temperature sensing body 6. It has become. In Example 1, the set humidity was detected by utilizing the liquefaction phenomenon of the deliquescent substance, but anhydrous salts such as cobalt dichloride, nickel chloride, and cobalt bromide whose color changes due to moisture absorption. The set humidity may be detected by changing the color tone using a compound.

  This embodiment has the structure as described above, and is provided with a pressure-sensitive adhesive layer or an adhesive layer on the surface of the base material 1 and inside various devices such as a mobile phone 8 as shown in FIG. The temperature-sensitive body 6 formed on the substrate 1 is fixed in advance to an inconspicuous part, and when the preset limit temperature is exceeded, the powdery wax melts and becomes transparent. As shown in Fig. 3, the colored surface 3 that has been hidden under it until now can be seen through from above, and the color of that part appears as if it has developed color, thereby exceeding the limit temperature. Will show the facts. After that, even if the temperature drops, once the wax becomes transparent, the fact that it exceeds the limit temperature continues to be displayed irreversibly because it does not return to opaque.

  On the other hand, when the limit humidity is exceeded, the moisture sensitive body 7 formed on the base material 1 is liquefied and oozes into the base material 1 around the moisture sensitive body 7 as shown in FIG. Then, a circular mark 8 appears, thereby visually displaying the fact that the limit humidity has been exceeded. Since this circular mark 8 does not disappear or shrink even if the humidity subsequently decreases, the fact that the limit humidity has been exceeded continues to be displayed irreversibly.

  Note that the temperature sensing element 6 in the present invention utilizes the melting action of powdered wax that is opaque at room temperature, and like the conventional wax-based temperature sensing element, the phenomenon of wax soaking into a masking material such as Japanese paper. Therefore, even if the thermosensitive body 6 is exposed to high humidity or submerged, the temperature sensing element 6 does not cause a false color operation and can continue to operate normally.

  In this manner, in this irreversible temperature-sensitive moisture sensor, since the temperature-sensitive body 6 formed thereon is resistant to moisture, the temperature-sensitive body 6 and the moisture-sensitive body 7 coexist on the same substrate. It can be installed inside a precision electronic device such as a mobile phone that has only a small installation space, and if it is left on the dashboard of a car under hot weather, submerged, or into a sauna bath It has the effect of clearly identifying the cause of failure that the user must take responsibility for, such as when brought in, and more effectively implementing product management and after-sales service. Further, it can be used for managing the temperature and humidity during transportation and storage of various products, and is particularly effective for product management during transportation by ship.

  It can be used to manage not only precision electronic devices such as mobile phones, but also any precision devices that are sensitive to heat and humidity.

The expansion perspective view of Example 1 of the irreversible temperature-sensitive moisture sensor which concerns on this invention. Similarly, the enlarged sectional view. Similarly, the front view which showed the state when a temperature sensing body and a humidity sensing body each detected the fact that preset temperature and preset humidity were exceeded. Similarly, as an example, a front view of a situation where the mobile phone is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base material 2 Colored paper 3 Colored surface 4 Humidity sensitive substance 5 Transparent film 6 Temperature sensing body 7 Humidity sensing body 8 Mobile phone

Claims (1)

A thermosensitive material made of a thermosensitive material that is opaque at room temperature, which is a mixture of powdery wax that melts at a preset temperature and a thickener, and the fact that the preset relative humidity is exceeded is irreversible. An irreversible temperature-sensitive moisture sensor, wherein a moisture-sensitive body to be displayed is disposed on the same substrate.

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