JP4775712B2 - Condensation detection sensor - Google Patents

Description

  The present invention relates to a dew condensation detection sensor, and more particularly, to a small and inexpensive dew condensation detection sensor that can detect dew condensation in an environment where a product is installed and grasp the state of dew condensation.

  As shown in FIG. 5, in the conventional dew condensation detection sensor, polyimide moisture sensitive films 112 and 113 are attached to both side surfaces of a main body 111 formed of a rectangular parallelepiped-shaped silicon member, and one of the attached polyimide impressions is sensed. One electrode 114 is provided so as to cover the wet film 112, and the other electrode 115 is attached to the side surface of the other polyimide moisture sensitive film 113. The respective electrodes 114, 115 are connected to the lead 116, and the lead 116 Is mounted on a substrate (not shown).

As described above, the conventional sensor that detects the humidity state by measuring the absolute value of the humidity is used by electrically reading the capacitance change of the polyimide moisture-sensitive films 112 and 113.
In order to use this sensor, a power supply for power supply and a measurement circuit for reading humidity are required, so that the structure is expensive and large.
JP 2003-114209 A (page 3, Fig. 1)

However, the dew condensation detection sensor described in the related art requires a power source or the like when actually used, and has a problem that it cannot be attached to a small product because it is large.
In addition, the conventional dew condensation detection sensor requires a power source or the like when actually used, and is large in size. Therefore, there is a problem that the dew condensation detection sensor cannot simulate a real part shape.
Furthermore, there is a problem that an expensive configuration is required because a power source or the like is required.
In addition, there is a problem that the direction in which condensation proceeds, such as which direction around the sensor tends to cause condensation, cannot be known.

  Therefore, it is possible to make a dew condensation sensor that is small and inexpensive, which can know the dew condensation environment regardless of inside or outside of the product housing, and closer to the state of the parts mounted on the product than the conventional dew condensation detection sensor. Resolved to a structure that can detect the presence or absence of condensation and know the direction of condensation in the surroundings of the condensation detection sensor. Has a problem that must be done.

  In order to solve the above problems, the dew condensation detection sensor of the present invention is configured as follows.

(1) The dew condensation detection sensor includes a humidity sensitive sensor formed of a member having a plane having a predetermined area, and a cover disposed with a minute gap on the plane to generate a capillary condensation phenomenon. Become.
(2) The dew condensation detection sensor according to (1), wherein a minute gap between the plane and the cover is a uniform gap.
(3) The dew condensation detection sensor according to (1), wherein the minute gap between the plane and the cover is an adjustable gap.
(4) The dew condensation detection sensor according to (1), wherein the cover is provided with a display indicating a measurement start time and a direction of an attached label.
(5) The dew condensation detection sensor according to (1), wherein a dew trace is left in the humidity sensitive sensor to determine which dew generation factor has a high influence in which direction.
(6) The dew condensation detection sensor according to (1), wherein the cover is made of a single metal or a combination of a plurality of metals.
(7) The dew condensation detection sensor according to (1), wherein the temperature sensitive sensor is provided with two electrodes, and the electrodes are electrically connected to each other at the time of dew condensation.
(8) The dew condensation detection sensor according to (1), wherein the cover is formed of a transparent member.

The proposed dew condensation detection sensor is composed of a humidity detection sensor having a predetermined plane and a cover arranged with a gap on the plane where a capillary condensation phenomenon occurs. Because there is, it is easy to paste on curved surfaces. Moreover, since it is smaller than the conventional one, there is an effect that even if it is attached to the outside or inside of the product, the specification of the product is not disturbed.
Moreover, since the structure of the sensor itself is simple, it is less expensive than the conventional one. Therefore, there is an effect that the present sensor can be affixed to all shipped products in advance from the time of product shipment.
Further, by looking at the state of the dew condensation detection sensor, it is possible to know in which direction the dew condensation factor having a high influence exists around the dew condensation detection sensor.
In addition, since the capillarity phenomenon is utilized, there is an effect that the state of condensation can be grasped in a form closer to a small component mounted on an actual product than a conventional sensor.

  Next, an embodiment of the dew condensation detection sensor according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, a dew condensation detection sensor 10 of the present invention is partly formed in a flat surface, and in the embodiment, a humidity sensitive sensor 11 formed in a circular shape with a flat plate, and a conical shape centering on a central position The cover 12 formed in a circular shape is arranged on the humidity sensitive sensor 11 so that the minute gap 13 in which the capillary condensation phenomenon occurs in the direction away from the center position can be adjusted.
Thus, since the dew condensation detection sensor 10 of the present invention does not require a power source or the like and has a simple structure, the dew condensation detection sensor 10 itself can be made small and thin, and can be mounted regardless of the inside or outside of the product. It becomes a sensor.

  As described above, the dew condensation 14 generated between the humidity sensitive sensor 11 and the cover 12 formed with a minute gap in which the capillary condensation phenomenon occurs is a dew condensation generated in a so-called component incorporated in an actual product. And condensation can occur under substantially the same conditions.

  The cover 12 can describe the measurement start time 16 and the sensor mounting direction 17. By describing the time of dew condensation that has occurred and the sensor direction, it is possible to know in which direction many dew marks are occurring, and the circuit board layout and air conditioning-related conditions inside the product The air flow direction and the like can be ascertained, which can contribute to product life and failure countermeasures.

  Further, by changing the inclination gradient of the cover 12, the minute gap is adjusted, and the dew point temperature due to capillary condensation can be adjusted.

  Then, as shown in FIG. 2, by removing the cover 12 and checking the state of the humidity sensitive sensor 11, the presence or absence of the condensation 14 and the state thereof can be known. In the figure, the dew condensation trace 15 remains on the plane of the humidity sensitive sensor 11, and it is possible to understand in which direction the dew condensation trace 15 is generated and the dew condensation is intense. For this reason, the position where actual humidity is likely to be generated is found, so that measures against humidity can be taken.

  Since the dew condensation detection sensor 10 is small in size, as shown in FIG. 3, it is possible to attach a double-sided tape or the like on the back surface and attach it to the printed circuit board 18 or the surface of the product housing 19.

  As the humidity sensitive sensor 11, a paper having a grid pattern printed on paper with aquatic ink may be used so that the trace state of condensation can be clearly grasped.

  Furthermore, by providing two metal electrodes on the dew condensation detection sensor 10 and applying a current between the two electrodes, migration occurs at the time of dew condensation, and it can also be used as a migration sensor.

Further, the material of the cover 12 constituting the dew condensation detection sensor can be changed to metal or the like as shown in FIG.
When the metal of the cover 12 is used, the sensitivity of corrosion may be changed by combining a plurality of types of metals 21A, 21B, 21C, 21D, 21E, 21F, 21G, and 21H for each portion of the cover 12.

Furthermore, by attaching a timer 22 to a part of the cover 12 made of metal, it is possible to observe the state of corrosion and condensation at the time of sensor observation along with the passage of time from the start of observation.
Here, it is needless to say that the shape of the cover 12 may not be circular or conical as long as a minute gap can be formed.

  As described above, by removing the cover 12 constituting the dew condensation detection sensor 10 and confirming the state of the humidity sensitive sensor 11, the presence / absence of dew condensation and its progress are known, and in which direction around the sensor, dew condensation occurs. It is possible to grasp whether there is a dew generation factor that has a high influence of.

  Further, by using a large number of the dew condensation detection sensors 10 side by side, it is possible to clarify the dew condensation start path in the product and to clarify the direction in which the dew condensation generation factor exists.

  By sticking such a dew condensation detection sensor 10 to all shipped products at the time of factory shipment or the like, all product users can recognize that the humidity is abnormal.

  Further, the cover 12 constituting the dew condensation detection sensor 10 is made transparent, and the dew condensation detection sensor 10 is pasted on the outside of the product so that it can be seen. For example, the product is used in a humidity environment outside the specification. The product user can recognize this. It is also possible to prevent the product user from intentionally using the product in a humidity environment outside the specifications.

  Since it is a dew condensation detection sensor composed of a humidity detection sensor having a predetermined plane and a cover arranged with a gap on which the capillary condensation phenomenon occurs, the product is a compact and thin structure. Provided is a dew condensation detection sensor that can be affixed to the outside or the inside of the machine.

The configuration of the dew condensation detection sensor of the present invention is shown schematically, showing the state of dew condensation during humidity measurement, wherein (A) is a plan view and (B) is a cross-sectional view. Similarly, the cover at the time of humidity observation is removed to show the state of condensation marks on the humidity sensitive sensor, (A) is a plan view and (B) is a cross-sectional view. It is explanatory drawing which showed the usage example of the dew condensation detection sensor. It is explanatory drawing which showed a mode when a cover was formed with the metal members similarly. It is explanatory drawing which showed the humidity detection sensor in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Condensation detection sensor 11 Humidity sensitive sensor 12 Cover 13 Micro gap 14 Condensation 15 Condensation trace 16 Measurement start time 17 Sensor mounting direction 18 Printed circuit board 19 Case 21A Metal 21B Metal 21C Metal 21D Metal 21E Metal 21F Metal 21G Metal 21H Metal 22 Timer .

Claims (8)

A humidity sensitive sensor formed of a member having a plane of a predetermined area;
A cover that is arranged with a minute gap such that a capillary condensation phenomenon occurs on the plane;
Condensation detection sensor comprising:   The dew condensation detection sensor according to claim 1, wherein a minute gap between the flat surface and the cover is a uniform gap.   The dew condensation detection sensor according to claim 1, wherein the minute gap between the flat surface and the cover is an adjustable gap.   The dew condensation detection sensor according to claim 1, wherein the cover is provided with a display indicating a measurement start time and a direction of an attached label.   The dew condensation detection sensor according to claim 1, wherein the humidity sensitive sensor leaves a dew mark for grasping in which direction there is a dew generation factor having a high influence.   2. The dew condensation detection sensor according to claim 1, wherein the cover is made of one kind of metal or a combination of a plurality of kinds of metals.   The dew condensation detection sensor according to claim 1, wherein the temperature sensitive sensor is provided with two electrodes, and the electrodes are electrically connected when dew condensation occurs. The dew condensation detection sensor according to claim 1, wherein the cover is formed of a transparent member.

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