JPH0322569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a portable electronic thermometer.

[Prior art]

Recently, in the thermometer market, electronic thermometers that digitally display temperature results have been seen here and there among mercury thermometers.

This type of electronic thermometer is available in Utility Model Publication No. 57-32827
As described in the publication, a temperature sensing part is provided at the elongated tip of the main body case, and the temperature measurement result is digitally displayed by connecting the output signal line of this temperature sensing part to the circuit board inside the main body case. is configured to do so.

However, in order to connect the temperature-sensing part at the tip to the circuit board inside the main body case, it is difficult to assemble it because the tip part is elongated. The temperature sensing part and circuit board are assembled in the case in advance, the output signal lines are connected by soldering, the circuit constants are calibrated, and after completion, the other case is placed over the case and the upper and lower cases are screwed together.

[Problem that the invention seeks to solve]

For this reason, there is a level difference between the upper and lower cases in the main body case, and this level difference tends to cause discomfort when used in the armpit or inside the oral cavity, and there is a risk of damaging the soft lips, so this is not desirable. It wasn't something.

Furthermore, because of the two-part case structure, the mechanical strength is weak and the case is easily distorted, which may cause the constants of circuit components that require precision to fluctuate, leading to the possibility of incorrect temperature readings being displayed.

As a countermeasure to this problem, it is possible to make the main body case integrally cylindrical and enclose the circuit board, thereby eliminating the mating step and improving the case strength. However, in this case, it is not only difficult to calibrate, but also difficult to disassemble in the event of a failure. Parts would become impossible to replace.

[Means for solving problems]

The present invention has been made in view of the above circumstances, and provides an electronic thermometer comprising a body case, a temperature-sensing section provided at the front end of the body case, a temperature-measuring circuit section including a circuit board, a body temperature measurement value display, and a power supply section. The main body case has a flat cylindrical shape consisting of a wide upper and lower surface and a narrow side surface, and when a circuit board is stored in this main case, an opening for adjusting the circuit board is located at a position corresponding to the circuit board on the wide lower surface of the main case. This opening is covered with a lid member.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained based on the ground. 1 is an external front view of an electronic thermometer according to an embodiment of the present invention, FIG. 2 is a front sectional view of the electronic thermometer shown in FIG. 1, and FIG. 3 is a plan sectional view of the electronic thermometer shown in FIG. 1.

In Fig. 1, 2 is a long main body case made of plastic and has a flat cylindrical shape consisting of a wide upper and lower surface and both narrow side surfaces, and 1 is provided at the front end of the main body case 2 to protect the thermistor and this. A thermosensing section consisting of an aluminum cap, 6 a display that displays body temperature measurements using a liquid crystal, and 9 a temperature measurement operation switch that is operated at the start of temperature measurement. In addition, main body case 2
The outer diameter of the tip to which the temperature sensing part 1 is attached is approximately 4 to 5 mm.
It forms a hollow shaft shape. In addition, the flat main body case 2
The front surface has openings 21 and 22 for installing the display 6 and the temperature measurement operation switch 9 on its wide upper surface side, and is formed so that the shape of the display 6 and temperature measurement operation switch 9 can be enlarged. As will be described later, there is an opening 23 for adjusting the circuit board at a position corresponding to the circuit board 3 when the circuit board 3 is housed inside the main body case 2, as will be described later.
and has an opening 24 for the battery case at the rear end (9
(c will be described later).

In Figures 2 and 3, 3 is a circuit board made of an elastic glass cloth-based epoxy resin plate with a thickness of 0.6 mm, and 8a to 8f are external circuit components soldered to the back side of the circuit board 3. , 8f is a circuit adjustment trimmer, and 5 is a temperature measurement IC that intermittently samples the temperature of the temperature sensing section 1 and displays it on the display 6 (FIG. 3). This IC 5 is a chip that is wire-bonded directly to the circuit board 3 and sealed, and its interior is manufactured using a low power consumption C-MOS process. In addition, the driving voltage of IC5 is
1.5V, the switch signal generated by operating the power switch 9 enters the temperature measurement mode, and after maintaining the temperature measurement mode according to predetermined conditions, the display 6 is turned off and the measurement standby state occurs. Since these are not directly related to the present invention, they will be omitted.
The temperature measurement circuit section 19 is constituted by the above-mentioned components, that is, the circuit board 3, the external circuit components 8a to 8f, and the IC 5.

4 is provided on the front inner wall of the main body case 2,
These ribs form grooves for holding the circuit board 3. Note that the ribs 4 are not held over the entire length of the circuit board 3, but are provided up to point A as shown in the figure, and hold approximately half of the front of the circuit board 3. Further, the inner diameter dimension W of the main body case 2 to which the circuit board 3 is attached is not constant over the entire length of the circuit board 3, but increases as it approaches the rear end from the front. This is because when the main body case 2 is molded from plastic, a mold cutting scent is applied when the mold is removed. Therefore, when the mounted circuit board 3 is inserted from the open rear end of the main case 2, it is held by the groove formed between the ribs 4 formed on the inner wall of the main case 2, and the ribs 4 hold the circuit board 3 in place. Movement in the direction perpendicular to the surface is restricted, but since the inner diameter W of the main body case 2 is larger than the width of the circuit board 3, if force is applied, it will move perpendicular to the surface within the elastic limit of the circuit board 3. can be displaced in the direction.

The temperature measuring operation switch 9 of the present invention is a push button switch, and in this embodiment, as shown in the figure, it is made of insulating rubber 9a and conductive rubber 9b, and is fixed to the circuit board 3. This is not limited to the one in this embodiment, and may be any push button switch that sends out a signal when pressed. In addition, with this circuit board 3 housed in the main body case 2, an opening is provided on the wide side of the main body case 2 corresponding to the temperature measurement operation switch 9 to expose the temperature measurement operation switch, and in this exposed state, The pressing operation surface of the temperature measurement operation switch 9 is approximately at the same height as the wide upper surface of the main body case 2, and 9c (FIG. 1) is an opening 22 provided in the main body case 2 for the temperature measurement switch 9. It is a concave opening inclined surface on the circumferential surface.

The operation surface of the temperature measurement operation switch 9 is made elongated in the direction orthogonal to the long axis direction of the elongated main body case 2, as shown in FIG. 1, to prevent erroneous operation when the switch is picked with a fingertip. .

A display holder 7 fixes the display 6 to the circuit board 3.

10 is a battery for power supply, for example, a silver oxide battery, 1
1 is a battery case detachably provided at the rear end of the main body case 2; 11a is a tongue part integrally provided at the end of the battery case 11 and inserted into the main body case 2; 12 is a tongue part provided under the battery case 11; In addition, a terminal 14 corresponding to the negative pole of the battery 10 is attached to the circuit board 3 and is a terminal corresponding to the positive pole of the battery 10, and a power supply unit 20 is constituted by these parts.

Note that the thickness B of the tongue portion 11a is equal to the distance between the back surface of the circuit board 3 held by the ribs 4 of the main body case 2 when it is not elastically deformed and the inner wall of the main body case 2 facing thereto. Thereby, when the temperature measuring operation switch 9 is pushed in the direction of the arrow C, the pressing force is received by the tongue portion 11a itself without causing deformation of the circuit board 3.

12a (Fig. 3) is a convex portion provided integrally with the terminal 12 near the tongue portion 11a of the terminal 12;
It sticks out a little more than that. Reference numeral 13 denotes a hole provided at the rear end of the circuit board 3, which engages with the convex portion 12a.

In FIG. 3, 15 is a lid member that covers the opening 23 provided on the back side of the main body case 2, that is, the wide lower surface on the opposite side from the display 6, in order to adjust each part of the side temperature circuit section 19, and 16 is a lid member. 15 is inserted into and engaged with the main body case 2 by means of locking claws provided integrally at both ends thereof. Reference numeral 17 indicates a boss for positioning the circuit board 3, which is integrally provided inside the lid member 15, and reference numeral 18 indicates a hole provided in the circuit board 3 that engages with the boss 17.

Next, the assembly order of the electronic thermometer of this embodiment configured as described above will be explained.

First, insert the lead wire of temperature sensing part 1, which is made by putting a thermistor into an aluminum cap and fixing it with silicone type adhesive, into the hollow shaft at the tip of main body case 2, and connect temperature sensing part 1 and main case 2. Glue and fix. Next, external circuit components 8a to 8f are attached to the back side of the circuit board 3 to which the IC 5 is wire-bonded.
After soldering the positive terminal 14, a liquid crystal display 6 is attached to the surface of the circuit board 3 via a display holder 7, and a temperature measuring operation switch 9 is bonded. The above component-mounted circuit board 3 is inserted into the main body case 2 through the opening 24 of the battery case 11 at the rear end of the main body case 2. Furthermore, at this time,
As mentioned above, the circuit board 3 has ribs 4 only on its front side.
Therefore, even if the temperature detection operation switch 9 protrudes and is fixed on the circuit board 3, the elastic switch 9 remains until the convex part of the temperature detection operation switch 9 enters the corresponding opening 22 of the main body case 2. The circuit board 3 can be pressed and bent and mounted in a predetermined position.

Next, a soldering iron is inserted through the circuit adjustment opening 23 covered by the lid member 15 of the main body case 2, and the lead wires of the temperature sensing section 1 are connected to the corresponding locations on the circuit board 3.

Next, put the negative terminal 12 under the battery case 11, and use the soldering iron to
A part of the terminal 12 is thermally deformed to fix the terminal 12 so that it does not fall off.

Furthermore, a battery case 1 containing a silver oxide battery 10
1 into the opening 23 at the rear end of the main body case 2. Here, terminal 1 provided in this battery case 11
After the convex portion 12a of the battery 2 pushes up the circuit board 3, it enters the hole 13 of the circuit board 3, giving the user who is replacing the battery a "click" sensation, and the battery case 11 is held in a predetermined position. This allows you to confirm that it is installed in the correct position.

After that, put the temperature sensing part 1 attached to the main body case 2 into a constant temperature water bath for adjustment, and use the adjustment trimmer from the opening 23 on the wide bottom surface of the main body case 2 so that the displayed value on the display 6 becomes the predetermined temperature. Adjust 8c.

Next, after verifying the measurement accuracy of the product, when the lid member 15 is pushed into the wide lower opening 23 of the main body case 2, the positioning boss 17 inside the lid member 15 fits into the hole 18 of the circuit board 3 and is positioned. At the same time, the claws 16 at both ends of the lid member 15 engage with the case, the lid member 15 is attached, and the assembly of the electronic thermometer is completed.

Next, the operation of the electronic thermometer of this embodiment when used will be explained.

That is, when the user uses this electronic thermometer to measure the temperature, first, open the inclined opening 9 of the main body case 2.
When the temperature measurement operation switch 9 is pressed so that the finger touches c, the circuit board 3 receives a downward force from the pressed conductive rubber 9b, but this force is supported by the tongue portion 11a of the battery case 11 as described above. Therefore, the circuit board 3 is not deformed in a direction perpendicular to its surface, and therefore is not damaged.

In addition, by using this electronic thermometer,
When replacing the battery 10 because the battery 10 has been exhausted and the voltage has decreased, the battery case 11 is pulled out from the main body case 2 rearward and a new battery 10 is installed there. Here, when pulling out the battery case 11, the circuit board 3 is connected to the negative terminal 12.
Due to the engagement between the protrusion 12a and the hole 13, the battery case 11 is pulled out to the rear along with the battery case 11.
Back cover 15 fixed to main body case 2 with claws 16
Since the boss 17 of the circuit board 3 is fitted into the hole 18 of the circuit board 3, the circuit board 3 does not move, so that the lead wire connected to the temperature sensing part 1 is stretched and disconnected. The temperature detection operation switch 9 is prevented from being mechanically damaged.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, an electronic thermometer includes a main body case, a temperature sensing section provided at the front end of the body case, a temperature sensing circuit section including a circuit board, a body temperature measurement value display, and a power supply section. In this case, the main body case has a flat cylindrical shape consisting of a wide upper and lower surface and a narrow side surface, and with a circuit board stored in this main case, an opening for adjusting the circuit board is provided at a position corresponding to the circuit board on the wide lower surface of the main body case. By providing a section and covering this opening with a lid member, the case can be made into an integral cylindrical shape without having to be divided into two parts, increasing the strength of the case. Adjustments, such as connecting the thermosensor to the circuit board and calibrating the measured temperature values, can be performed through the opening for adjusting the circuit board.Furthermore, by forming this opening on the wide bottom surface, the opening window area can be reduced. It can be made relatively large and can be easily adjusted.

After adjustment or maintenance or replacement, this opening is covered with the lid, so the user does not notice it directly, making it easier to use.

[Brief explanation of the drawing]

1 is an external front view of an electronic thermometer according to an embodiment of the present invention, FIG. 2 is a front sectional view of the electronic thermometer shown in FIG. 1, and FIG. 3 is a plan sectional view of the electronic thermometer shown in FIG. 1. 1...Temperature sensing section, 2...Main case, 3...Circuit board, 6...Display unit, 9...Temperature measurement operation switch,
DESCRIPTION OF SYMBOLS 10... Battery, 15... Lid member, 19... Temperature measurement circuit part, 20... Power supply part, 23... Opening part.

Claims (1)

[Claims] 1. In an electronic thermometer that includes a main body case, a temperature-sensing section provided at the front end of the body case, a temperature-measuring circuit section including a circuit board, a body temperature measurement value display, and a power supply section, the main body case is separated from the wide upper and lower surfaces and the narrow side surfaces. With the circuit board stored in the main case, an opening for adjusting the circuit board is provided at a position corresponding to the circuit board on the wide lower surface of the main case, and this opening is covered with a lid member. An electronic thermometer featuring