JPH035901Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a humidity sensor with an improved exterior structure.

[Technical background of the invention and its problems] In general, a humidity sensor using a porous ceramic sintered body has external parts on both the front and back sides of a humidity sensing element 21 formed and sintered into a disk shape, as shown in FIG. Apply electrode material paste leaving the periphery 22 and bake it to form the electrode 23.
An extremely thin platinum wire 24 is attached to an arbitrary location on the surface of the electrode 23, and the platinum wire 24 and an external terminal 26 integrally fixed to the stem 25 are connected. The moisture sensing element 21 is housed in an exterior case 28 provided with a pore 27, and the stem 2
5 is fitted and locked into the opening of the exterior case 28, and then the gap in the opening is filled with sealing resin 29 and sealed.

In the humidity sensor configured as described above, the platinum wire 24 led out from the humidity sensing element 21 is connected to the external terminal 26 which is integrally fixed to the stem 25, and the stem 25 is fitted and locked into the opening of the outer case 28. However, since the structure is such that the moisture sensing element 21 is fixed in the outer case 28 by filling the gap of the opening with the sealing resin 29, the process is completed by fitting and locking the stem 25 and further filling the sealing resin 29. This required a large number of parts, not only in terms of work, but also in the number of parts, which was an impediment to the market demand for lower prices, and at the same time it was an impediment to the market demand for miniaturization.

[Purpose of the invention] The present invention was made in view of the above points, and by improving the outer case structure, the number of parts is reduced and the process is simplified, thereby providing a small and inexpensive humidity sensor. The purpose is to

[Summary of the invention] The humidity sensor of the invention uses a vertically divided two-part fit-in type exterior case configured to sandwich a humidity sensing element, and the humidity sensing element is provided on one side of the exterior case. Leading out an external terminal incorporated into the mounting groove and connected to a leader wire drawn out from the electrodes formed on both surfaces of the moisture-sensitive element through a terminal lead-out groove provided so as to be continuous to the outside in connection with the element mounting groove, It is characterized in that the other side of the vertically divided two-part fitting type exterior case is fitted.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings. That is, as shown in FIG. 2, a diagonal shaped part 1 consisting of a circular concave part is provided at the four corners of the periphery, a part is made into a ventilation hole part 2, and a plurality of element supporting protrusions 3 are provided around the ventilation hole part 2. 4, and the groove 4
As shown in FIG. 3, a disk of ceramic powder is applied to the element installation groove 4 on one side 6 of the vertically divided two-part fit-in type exterior case, which has two parallel lead-out terminal lead-out grooves 5 connected to the outside and connected to the outside. A lead wire 10 is attached to the electrode 8 of a moisture sensing element 9 made of porous ceramic which is formed and sintered to form an electrode 8 with an outer periphery 7 left on both sides, and a lead terminal is attached to the lead wire 10. 11 is connected, as shown in FIG. 1, the moisture sensing element 9 is assembled, and at the same time, the lead terminal 11 is pulled out through the lead terminal lead-out groove 5, and then, as shown in FIG. A shaped part 12 consisting of a circular convex part that matches the shaped part 1 is provided on one side 6 of the vertically divided two-part fit-in type exterior case, and a part is made into a ventilation hole part 13. The shaped part 12 of the other side 15 of the vertically divided two-part fitting type exterior case provided with the element support protrusion 14 is aligned with the hollow part 1, and the one side 1 of the vertically divided two-part fitting type external case It is formed by fitting the other side 15 of a vertically divided two-part fit-in type exterior case into one body.

According to the humidity sensor configured as described above, the humidity sensing element 9 is simply inserted between the vertically divided two-part fitting type exterior case 6 on one side and the vertically dividing two-part fitting type external case 15 on the other side. It is possible to fix the moisture sensitive element 9 with a simple structure, and the number of parts can be reduced without using a stem and sealing resin as in the conventional structure, making it possible not only to downsize but also to simplify the process. This allows cost reduction.

In the above embodiment, the outer case shape is exemplified as a rectangular one, but the shape is not limited to this, and it may be circular, for example, and the shape of the moisture sensing element is also limited to that exemplified in the above embodiment. Needless to say, a square plate-like one may be used instead of a square plate. In addition, in the above embodiment, the frame part is provided on one side of the outer case, and the shaped part is provided on the other side of the outer case. The same effect can be achieved even in a configuration in which the nime-shaped portions and the o-shaped portions are provided alternately.

[Effects of the invention] According to the invention, it is possible to provide a humidity sensor with high practical value that can meet market demands by reducing the number of parts, making it compact, simplifying the process, and significantly contributing to cost reduction.

[Brief explanation of drawings]

Figures 1 to 4 relate to one embodiment of the present invention, with Figure 1 being a half-sectional perspective view showing a humidity sensor, and Figure 2 being one side of the vertically divided two-part fit-in type exterior case that constitutes Figure 1. FIG. 3 is a front view showing the state in which the pull-out terminal is connected to the moisture-sensing element shown in FIG. 1, and FIG. FIG. 5 is a front sectional view showing a conventional humidity sensor. 1... Female-shaped part, 2, 13... Ventilation hole part, 4...
Element installation groove, 5...Output terminal lead-out groove, 6...One side of vertically divided two-part fit-in type exterior case, 8...Electrode, 9...Moisture sensing element, 10...Leader wire, 11...
Output terminal, 12...Form part, 15...The other side of the vertically divided two-part fit-in type exterior case.

Claims (1)

[Scope of utility model registration request] A vertical groove is provided with a hole-shaped part or a round part around the periphery, a part of which is used as a ventilation hole, an element installation groove is provided around the ventilation hole, and two parallel lead-out terminal lead-out grooves connected to the groove and connected to the outside are provided. A split two-part fitting type exterior case on one side, a plate-shaped moisture sensing element provided with a pair of electrodes incorporated in the element installation groove, a leader wire attached to the electrode, and the leader wire. An external terminal that is connected and pulled out to the outside through the lead-out terminal lead-out groove, and a vertically divided into two parts with a shaped part or a shaped part that matches the shaped part or shaped part on the periphery and a part as a ventilation hole. and a fitting-type outer case on the other side, and the shaped part or the oval part on the other side of the outer case and the oval part or the oval part on the one side of the outer case are matched and integrated. humidity sensor.