JP2002071471A - Electronic clinical thermometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost for fixing a battery spring. SOLUTION: Three spring presser parts 13b, 13c, and 13d are formed on the bottom surface of a battery cap 13. The battery spring 14 is almost cross shape in top view, with a battery spring terminal 14a as well as three U-shape spring fixing part 14b, 14c, and 14d orthogonal to it formed. When the battery spring 14 is attached to the battery cap 13, the three spring presser part formed at the battery cap 13 cooperate to pressurize, from above and below, the three U-shape spring fixing parts formed at the battery spring 14. Meanwhile, two protruded band parts 11b are formed at a battery cap housing bottom-surface 11a of a case main body part. When the battery cap with the battery spring is built in the case main body part, a pressurizing part 11c at the tip of the protruded band part 11b pressurizes the side surface of the battery spring 14 to hold the side surface of the battery spring 14. The battery spring 14 is vertically/horizontally held by the battery cap 13 and the case main body part for sure fixing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic thermometer, and more particularly to a structure for fixing a battery spring.

[0002]

2. Description of the Related Art In recent years, small electronic thermometers using thermistors and the like have been marketed at low cost, and the disadvantages of conventional mercury thermometers, such as fragile, harmful, and difficult to read, have been improved and spread. ing.

FIG. 8A is a sectional view showing a structure in which a battery is slid from a side into a battery cap in a conventional electronic thermometer, and FIG. 8B is a fixing structure by caulking.
FIG. 8C shows a fixing structure using a double-sided tape or an adhesive.

In FIG. 8, reference numeral 1 denotes a circuit board on which electric elements such as ICs are mounted. Reference numeral 2 denotes a switch rubber, which performs switching by conducting a switch pattern on the circuit board 1 by a push operation. 3 is thermistor, 4
Is a liquid crystal display, 5 is a battery, and 6 is a case, which is integrally formed on the front side 6A and the back side 6B. Reference numeral 7 denotes a battery cap, 8 denotes a sensor cap made of a metal member such as Al or Sus, and 9 denotes a back cover. The sensor cap 8 is connected to the case 6 by an adhesive or the like, and the thermistor 3 is connected to the circuit board 1 by a lead wire 3a. The shape of the case 6 is a thin rod-shaped temperature measuring probe portion 10 communicating with the thermistor 3 (temperature measuring portion), the circuit board 1, and the liquid crystal display 4.
And a substantially oblong case body part 1 for storing the battery 5 and the like
1.

The battery cap 7 and the case 6 are both manufactured by injection molding of a synthetic resin. The battery cap 7 has a battery storage portion 7a for storing two batteries 5, and a hook 7b is formed at a free end. On the other hand, a slit 6a that engages with a hook 7b formed on the battery cap 7 is formed at the end of the back side 6B.
The hook 7b is engaged with the slit 6a on the back surface 6B when the battery cap 7 is slidably mounted on the case 6, and the battery cap 7 is fixed to the case 6.

The shape of the battery spring 12 provided on the bottom surface of the battery housing portion of the battery cap 7 has a substantially cruciform planar shape, and has a battery spring terminal 12a that rises in a bowl shape in the cap sliding direction. A spring fixing portion 12b extending perpendicular to the battery spring terminal 12a is formed.

The structure for fixing the battery spring 12 is shown in FIG.
As shown in the caulking method of (a), after a caulking boss 7c protruding from the bottom surface of the battery cap 7 and a caulking hole 12c provided in the fixing portion 12b of the battery spring 12,
It is caulked and fixed using a caulking machine.

FIG. 8 (b) shows a fixing portion 12b of the battery spring 12 fixed to the bottom surface of the battery cap 7 by a double-sided tape or an adhesive with a double-sided tape or an adhesive.

[0009]

However, the above-mentioned structure for fixing the battery spring of the electronic thermometer has the following problems. That is, in the fixing method by caulking, a caulking device is required, and the equipment cost is high, and at the same time, man-hours are required for the caulking operation. In addition, in the bonding method, a double-sided tape or an adhesive must be purchased, which requires a material cost, and the bonding work requires a lot of man-hours, which leads to problems such as an increase in cost.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an inexpensive battery spring fixing structure in which a battery spring is securely fixed to a battery cap.

[0011]

To achieve the above object, an electronic thermometer according to the present invention comprises a rod-shaped case having a thermoelectric conversion element covered with a sensor cap at one end, and a second end of the case. A detachable battery cap provided in, a lead wire from the thermoelectric conversion element is connected to the case body portion, an electronic circuit for calculating body temperature, and a display means for displaying the body temperature by a signal from the electronic circuit, In an electronic thermometer for housing a battery for driving the electronic circuit in the battery cap, the battery cap has three spring pressing portions extending in a cap sliding direction on a bottom surface of the battery housing portion. The battery spring disposed on the bottom has a substantially cross-shaped planar shape, and has a battery spring terminal that rises in a bowl shape in the cap sliding direction,
Three U-shaped spring fixing portions extending in the shape of a crank orthogonal to that are formed, and the battery cap terminal is inserted into the battery cap so that the battery spring terminal of the battery spring is in the cap sliding direction. The three spring holding portions are formed so as to cooperate with each other to press down three U-shaped spring fixing portions formed on the battery spring from above and below to prevent the battery spring from coming off in the vertical direction. On the bottom surface of the battery cap, there are formed two convex strips that protrude from the bottom surface and extend in the cap sliding direction, and the battery cap is mounted on the case body with the battery spring mounted on the battery cap. The tip pressing portion of the formed convex portion presses the side surface of the battery spring to prevent the battery spring from coming off in the lateral direction. It is characterized in that the fixed holding the spring in the longitudinal and lateral directions.

[0012] Of the three spring holding portions formed on the battery cap, two at both ends hold the U-shaped spring fixing portion of the battery spring from above, and one at the center of the battery spring has a U-shaped spring fixing portion. The U-shaped spring fixing portion is configured to be pressed from the lower surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic thermometer according to the present invention will be described below with reference to the drawings. 1 to 3 show an electronic thermometer according to an embodiment of the present invention. FIG. 1A is a plan view showing a state before a battery cap is assembled, and FIG.
2B is a plan view of a state before the battery spring is mounted on the battery cap, FIG. 2A is a transparent plan view of a state after the battery cap is assembled, and FIG. 2B is FIG. 2A. A-A
FIG. 2C is a cross-sectional view of the battery spring. In the figure, the same members as those of the prior art are denoted by the same reference numerals.

In FIG. 1 and FIG.
Is a circuit board on which electric elements such as ICs are mounted. 2
The switch performs switching by conducting a switch pattern on the circuit board 1 by a push operation using a switch rubber. 3 is a thermistor, 4 is a liquid crystal display, 5 is a battery, 6 is a case, 8 is a sensor cap made of a metal member such as Al or Sus, and the sensor cap 8 is a case 6
Thermistor 3 is connected to circuit board 1 by lead wire 3a. Reference numeral 13 denotes a battery cap described later. The shape of the case 6 is composed of a thin rod-shaped temperature measuring probe portion 10 communicating with the thermistor 3 (temperature measuring portion) and a substantially elliptical case body portion 11 containing the circuit board 1, the liquid crystal display 4, the battery 5, and the like. It is configured.

The bottom surface 11a of the battery cap housing of the case body portion 11 is formed with two convex bands 11b projecting from the bottom surface and extending in the cap sliding direction as shown by oblique lines. A pressing portion 11c that presses a side surface of a battery spring 14, which will be described later, at a tip end surface of the band portion 11b.
It is.

The battery cap 13 and the case 6 are both manufactured by injection molding of a synthetic resin. Battery cap 1
3 has three spring holding portions 13b, 13c, 13d extending in the cap sliding direction on the bottom surface of the battery housing portion 13a.

As in the prior art, the battery cap 13 and the case 6 are snap-fitted such that a hook (not shown) of the battery cap 13 is engaged with a slit of the case 6 and fixed when the battery cap 13 is slid onto the case 6. It has a fit structure.

FIG. 3 shows a battery spring, FIG. 3 (a) is a plan view of the battery spring, FIG. 3 (b) is a front view of FIG. 3 (a), and FIG.
FIG. 3C is a sectional view taken along line BB of FIG. In FIG. 3, the shape of the battery spring 14 has a substantially cross-shaped planar shape, has a battery spring terminal 14 a that rises in a bowl shape in the cap sliding direction (the direction of the arrow CC), and extends perpendicular to the terminal. Three U-shaped spring fixing portions 14 in a crank shape
b, 14c and 14d are formed. The battery spring 14 can be easily manufactured by pressing a metal plate having a spring property, such as phosphor bronze, by a press and performing a bending process.

The operation of fixing the battery spring with the above configuration will be described. FIG. 4 shows the case body, FIG. 5 shows the battery cap before the battery spring is mounted, FIG. 6 shows the battery cap after the battery spring is mounted, and FIG. It is a partial plan view.

As described above, in FIG. 4, the battery cap housing bottom surface 11a of the case main body portion 11 is formed with two convex belt portions 11b projecting from the bottom surface and extending in the cap sliding direction as shown by oblique lines. Have been. The length L of the protruding band portion 11b is such that the end face (pressing portion) 11c of the protruding band portion 11b is attached to the battery cap 13 when the battery cap 13 is assembled into the case body portion 11.
The length is set so as to be in contact with the side surface of No. 4.

3C, 5 and 6, a battery spring terminal 14a of a battery spring 14 is attached to the battery cap 13.
Is inserted in the cap sliding direction, the three spring holding portions 13 formed on the battery cap 13 are inserted.
b, 13c, 13d, the long spring holding portion 13 at the center
b of the three U-shaped spring fixing portions 14b, 14c and 14d formed on the battery spring 14 presses the central spring pressing portion 14b from below, and the spring pressing portions 1 on both sides.
3c and 13d are spring fixing portions 1 on both sides of the battery spring 14.
By pressing the 4c and 14d from above, the three U-shaped spring fixing portions formed on the battery spring 14 are pressed from above and below to prevent the vertical (longitudinal) removal.

In FIG. 7, when the battery cap 13 with the battery spring 14 is assembled into the case main body 11, the end face (pressing portion) 11c of the convex band portion 11b comes into contact with the side surface of the battery spring 14 mounted on the battery cap 13. By holding the battery spring 14 in contact with it, the battery spring 14 acts to prevent the battery spring 14 from coming off in the horizontal direction (lateral direction).

As described above, in the structure for fixing the battery spring, the battery spring is mounted on the battery cap by using the caulking method or the bonding method on the battery cap as in the related art without increasing the cost. Only by the operation of incorporating the cap into the case main body portion, the spring holding portion of the battery cap and the end surface (pressing portion) of the convex band portion of the case main body portion cooperate to hold the battery spring from above and below and from the side surface, so that the battery spring is It can be fixed securely. Also, since the spring fixing structure does not use the caulking method or the adhesive method, it is extremely easy to attach and detach the battery spring by replacement or the like.

[0024]

According to the above-described structure for fixing the battery spring of the electronic thermometer of the present invention, after the battery spring formed by press working is mounted on the battery cap, the operation of simply incorporating the battery cap into the case body is performed. It is possible to fix securely. Further, the conventional caulking device for caulking and the double-sided tape and adhesive required for the adhesive fixing are not required at all, and the cost can be greatly reduced.

[Brief description of the drawings]

FIG. 1A is a plan view showing a state before a battery cap is incorporated, and FIG. 1B is a plan view showing a state before a battery spring is mounted on the battery cap, according to the electronic thermometer according to the embodiment of the present invention. It is a top view of a state.

FIG. 2 (a) is a transparent plan view of the electronic thermometer of FIG. 1 in a state after a battery cap is assembled, and FIG. 2 (b).
2A is an enlarged sectional view taken along line AA of FIG. 2A, and FIG. 2C is a sectional view of the battery spring.

3 (a) is a plan view of a battery spring, FIG. 3 (b) is a front view of FIG. 3 (a), and FIG. 3 (c) is BB of FIG. 3 (a).
It is a line sectional view.

FIG. 4 is a plan view of a main part in the vicinity of a battery cap accommodating portion of a case main body in FIG. 1;

FIG. 5 is a plan view of a battery cap before a battery spring is mounted.

FIG. 6 is a plan view of a battery cap after a battery spring is mounted.

FIG. 7 is a plan view showing a state in which a battery cap with a battery spring is incorporated in a case body.

FIG. 8A is a cross-sectional view showing a structure in which a battery is slid from a side into a battery cap in a conventional electronic thermometer, and FIG. 8B is a structure in which a battery spring is fixed to the battery cap; Plan view showing a fixing structure according to FIG. 8,
(C) is a plan view showing a fixing structure using a double-sided tape or an adhesive.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Switch rubber 3 Thermistor 4 Liquid crystal display 5 Battery 6 Case 8 Sensor cap 10 Temperature measuring probe part 11 Case main body part 11a Battery cap storage bottom part 11b Convex belt part 11c Pressing part 13 Battery cap 13b, 13c, 13d Spring holding Part 14 Battery spring 14a Battery spring terminal 14b, 14c, 14d Spring fixing part

Claims (2)

[Claims] 1. A rod-shaped case provided with a thermoelectric conversion element covered with a sensor cap at one end, a detachable battery cap provided at the other end of the case, and the thermoelectric conversion element provided on a case body. An electronic circuit to which a lead wire is connected to calculate a body temperature, display means for displaying the body temperature by a signal from the electronic circuit, and an electronic thermometer that stores a battery that drives the electronic circuit in the battery cap, The battery cap has three spring pressing portions extending in the cap sliding direction on the bottom surface of the battery storage portion, and the battery spring disposed on the bottom surface of the battery storage portion has a substantially cross-shaped planar shape. A battery spring terminal rising in a bowl shape in a cap sliding direction, and three U-shaped spring fixing portions extending in a crank shape perpendicular to the battery spring terminal are formed; By inserting the battery spring terminals of the battery spring into the cap sliding direction, the three spring holding portions formed on the battery cap cooperate with each other to form three U-shapes formed on the battery spring. The vertical spring fixing portion is pressed down from above and below to prevent the battery from being pulled out in the vertical direction, while the bottom surface of the battery cap housing of the case main body protrudes from the bottom surface and extends in the cap sliding direction.
The convex band portion of the book is formed, and the battery cap is assembled into the case body with the battery spring attached to the battery cap, so that the tip pressing portion of the convex band portion formed on the case body presses the side surface of the battery spring, An electronic thermometer, wherein the battery spring is configured to prevent the spring from coming off in the horizontal direction, and the battery spring is held and fixed in the vertical and horizontal directions by the battery cap and the case body. 2. Of the three spring pressing portions formed on the battery cap, two at both ends press the U-shaped spring fixing portion of the battery spring from above, and one at the center of the battery spring is The electronic thermometer according to claim 1, wherein the U-shaped spring fixing portion is configured to be pressed from below.