JPS6231915Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of a sensor portion of an electronic wristwatch with a thermometer.

[Conventional technology]

Recent advances in electronics have made it possible to realize temperature measurement systems with extremely low power consumption using temperature detection elements such as thermistors, and thermometers are now being added to wristwatches. This allows you to measure temperature, which is closely related to daily life, anywhere, and also has functions such as automatically measuring and storing temperature at a set time, and alerting you with a buzzer etc. when the set temperature matches the measured temperature. This is because it can be easily realized and convenient by combining it with the functions possessed by .

Conventionally, as an electronic wristwatch with a thermometer using a temperature detection element such as a thermistor, for example,
There were those shown in Publication No. 27983 and Japanese Utility Model Application Publication No. 49-3559.

That is, JP-A No. 51-27983 describes a watch with a thermometer in which a temperature detection element is disposed inside a watch case and a wristwatch exterior made of glass, and JP-A No. 49-3559 describes a watch with a thermometer in which a temperature detection element is placed in a through hole provided in a watch case, the lead wire of the temperature detection element is passed through the glass, and the lead wire is connected to a watch module inside the watch case. ing.

[Problem that the invention attempts to solve]

However, when a wristwatch is worn on the wrist, the temperature of the watch itself is different from the air temperature due to the influence of body temperature. Therefore, as shown in Japanese Patent Application Laid-Open No. 51-27983, if a temperature detection element is placed inside the exterior member such as the case body or windshield of a wristwatch,
The temperature inside the watch will be measured, which is affected by body temperature, and the temperature displayed will be different from the temperature outside the watch that is originally intended to be measured.

Therefore, in order to make the measured temperature as close as possible to the temperature outside the watch, as shown in Japanese Utility Model Application Publication No. 49-3559, a through hole is provided in the exterior member such as the case body, so that the temperature detection part can be detected by the air outside the watch. The electrical connection lead of the temperature detection element is fixed to the through hole so as to touch the temperature detection element, and the temperature detection element has a converter for converting the output of the temperature detection element into a digital quantity by some means, and a display panel for displaying the converted temperature. A structure in which it is connected to a module can be considered.

Generally, in this structure, a thermistor covered with glass is used as the temperature detection element, but because of its poor shape precision, it is difficult to fix it in the through hole as it is. Clocks are often used to measure underwater temperature;
Since a waterproof structure is usually adopted, the thermistor needs to be further covered with resin or ceramic to make it waterproof, which makes the structure complicated.
It also becomes expensive.

[Purpose of invention]

An object of the present invention is to provide an electronic wristwatch with a thermometer that can accurately and quickly measure the temperature outside the timepiece and has a temperature detection section structure that is also waterproof.

[Means to achieve the purpose]

In order to achieve the above object, the present invention has the following configuration. That is, in an electronic wristwatch with a thermometer configured to detect external temperature by a temperature detection element such as a thermistor disposed in a through hole provided in an exterior member such as a case body or a windshield, the through hole is A temperature sensing member is attached to the hole through a holding member with the recessed portion inside, and the temperature detection element is disposed within the recessed portion of the temperature sensing member and has an elastic body that presses the temperature sensing member so as to come into contact with the temperature sensing member. The holding member is made of a material having a lower thermal conductivity than the exterior member, and the temperature-sensitive member is made of a material having a higher thermal conductivity than the holding member. It is characterized by being composed of.

[Effect]

The details of the present invention will be explained below.

FIG. 1 is a partial cross-sectional view showing the mounting portion of the temperature detection element of the present invention.

In FIG. 1, a temperature sensing plate 2 having a concave portion in which a thermistor 1, which is a temperature sensing element, is to be accommodated has a waterproof gasket 3 inserted into a through hole 4a provided in a windshield 4 fixed to a case body (not shown). has been fixed through.

When the thermistor 1 is in the module state (before being assembled into the exterior), it is fixed at position 1' by soldering or welding one end 1b of the electrical lead wire 1a to the circuit board 5, which is a component of the module. There is. The electrical lead wire 1a made of metal wire has elasticity, and the thermistor 1 is pushed down by the temperature sensitive plate 2 when the module is assembled on the exterior. is pressed against the temperature-sensitive plate 2 and is configured to always come into contact with the temperature-sensitive plate 2.

In addition, there is a waterproof gasket 3 made of a rubber material having a lower thermal conductivity than the temperature sensitive plate 2 made of aluminum, the windshield 4 which is an exterior member, and the thermistor 1.
acts not only as a holding member for airtightly holding the temperature sensitive plate 2 to the windshield 4, but also as a heat insulating material between the temperature sensitive plate 2 or thermistor 1 and the windshield 4, As mentioned above, thermistor 1
is in contact with the temperature sensing plate 2, so most of the temperature outside the watch, where the surface 2a of the temperature sensing plate 2 is in contact, is transmitted to the thermistor 1 through the temperature sensing plate 2, so the temperature of the thermistor 1 is The temperature becomes very close to the temperature of the surface 2a of the temperature sensitive plate 2. In addition, since the tip of the thermistor 1 is always in pressure contact with the temperature sensing plate 2, the temperature sensing plate 2
The heat conduction from the to the thermistor 1 is always stable, and the responsiveness of heat conduction is also improved.

Note that electronic components including a converter for displaying the temperature of the output of the thermistor 1 are mounted on the circuit board 5, and correction of variations in the characteristics of the thermistor 1 can be made in a modular state.

〔Example〕

The example shown in FIG. 1 above shows an example in which an electric lead wire is used as the elastic body and the temperature sensing element is pressed by the elasticity so as to come into contact with the temperature sensing member. It is shown in Figure 2.

FIG. 2 shows a second embodiment in which the outside temperature and the temperature of the thermistor 1 are brought closer to each other, and the configurations of the temperature sensitive plate 2, waterproof gasket 3, and windshield glass 4 are the same as in the first embodiment. The electrical connection lead 1a of the thermistor 1 is made of a thin metal wire that can be deformed with a very small force, and one end 1b of the lead 1a is connected to the circuit board 5 by welding.

In addition, after assembling the spacer 7 and circuit board 5, which are components of the module, the holes 7a of the spacer 7 are filled with foaming resin and foamed to form an elastic heat-insulating cushion 8, which can be used as an elastic body. There is. This heat insulating cushion 8 is formed so as not to cover the upper part of the thermistor 1.

In this embodiment as well, the thermistor 1 is configured to be at the 1' position in the module state, and when the module is assembled on the exterior,
The thermistor 1 is pushed down by a temperature sensitive plate 2 filled with grease 6 mixed with powder of magnesia or the like, which is an electrical insulator with good thermal conductivity.

In this case, since the heat insulating cushion 8 is made of a foam material, the head of the thermistor 1 breaks through the grease 6 due to its elasticity at the same time as the cushion 8 deforms, resulting in contact between the thermistor 1 and the temperature sensitive plate 2. It is configured so that it is maintained.

That is, in this embodiment, since the space is filled with grease 6 having good thermal conductivity, the temperature is further improved compared to the embodiment of FIG. From temperature sensing plate 2 to thermistor 1
The efficiency of heat conduction to the module is increased, and since the electrical connection lead 1a is thin, the escape of heat to the module is also reduced.Furthermore, the heat insulating cushion 8 reduces the influence of heat from the module due to convection, resulting in higher precision. Good temperature measurements are now possible.

Since the thermosensitive plate 2 is made of aluminum, coining processing such as forming unevenness on the surface 2a is easy, and by engraving letters, patterns, etc., it improves the design and at the same time prevents external air from entering. By increasing the contact area, it is possible to further improve the efficiency of heat conduction.

Furthermore, although the surface is alumite-treated for corrosion resistance, it is also possible to improve the design by performing multi-colored alumite treatment.

[Effect of idea]

As described above, according to the present invention, the temperature outside the watch can be measured accurately and quickly using the temperature-sensitive member having a recessed part, and since the temperature-sensitive member is firmly attached with the holding member, the part to which it is attached can be easily measured. It is possible to provide an electronic wristwatch with a thermometer that can maintain waterproofness and has better temperature detection performance and waterproof performance than conventional ones.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view of the temperature detection element mounting portion of the present invention. FIG. 2 is a partial cross-sectional view of an embodiment of the present invention. 1... Thermistor, 2... Temperature sensitive plate, 3... Waterproof packing, 4... Windshield glass, 5... Circuit board,
6... Grease, 7... Spacer, 8... Insulating cushion.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A device configured to detect external temperature using a temperature detection element such as a thermistor placed in a through hole provided in an exterior member such as the case body or windshield. In the electronic wristwatch with a thermometer, a temperature sensing member is attached to the through hole through a holding member with the recessed portion inside, the temperature detection element is disposed within the recessed portion of the temperature sensing member, and the temperature sensing member It is fixed to a part of the watch module via an elastic body that is pressed into contact with the watch module.
Moreover, the holding member is made of a material having a lower thermal conductivity than the exterior member, and the temperature sensing member is made of a material having a higher thermal conductivity than the holding member. electronic watch. (2) The electronic wristwatch with a thermometer according to claim 1, wherein the holding member also serves as a waterproof gasket for maintaining airtightness between the temperature-sensitive member and the exterior member.