JPS60205321A - Electrostatic capacity type electronic scale - Google Patents

Abstract

PURPOSE:To inspect the scaling of a body during manufacture through the assembled part of the lower case of the electrostatic scale and rationalize the assembly by providing the lower case with an electrode part, electronic circuit, display part, etc. CONSTITUTION:The electronic scale is constituted separately as an upper case B and the lower case C. A fixed frame 11 is fixed to the lower case C and a movable frame 12 is provided oppositely to the fixed frame 11 and fixed with leaf springs 13 and 14. Further, a fixed electrode 18 is fitted to the fixed frame 11, and a movable electrode 19 is fitted to the movable frame 12. Then, when a body is placed on a sample table 35, the movable frame 12 moves down to increase the gap between the fixed electrode 18 and movable electrode 19, and the electrostatic capacity between both electrodes varies. This electrostatic capacity is converted into an electric signal by the electronic circuit of a printed wiring board 28 and displayed on a display part 29. Therefore, respective parts are assembled in the lower case C and the covered with the upper case after the body scaling is inspected, so the assembling operation is rationalized and the number of the parts is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a capacitive electronic scale for weighing objects.

Configuration of conventional example and its problems As shown in FIG. 1, this type of conventional electronic scale has a main printed wiring board 1 equipped with an electronic circuit for displaying weight on a display section (not shown). An on/off switch 4 is attached to the upper case 3 that is fixed to the lower case 2 and covers the lower case 2.
At the same time, a switch operation section 6 is installed so as to cover the on/off switch 4.
Since the main printed wiring board 1 and the sub printed wiring board 6 are connected by the cord 7, the configuration becomes very complicated. Since it is necessary to connect both printed wiring boards 1 and 5 with cord 7 after installing them separately, it is extremely unreasonable, and it is difficult to check whether the weight is displayed on the display section. This method also has various problems, such as the need to connect the main printed wiring board 1 and the sub printed wiring board 6 with the cord 7.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is an electrostatic electrostatic device that can be assembled rationally and that allows inspection of whether or not the weight is displayed on the display section using only a single printed wiring board. The purpose is to provide a capacitive electronic scale.

Structure of the Invention In order to achieve the above object, the present invention fixes to the lower case a printed wiring board equipped with a display section, an electronic circuit for displaying the weight of the object on the display section, and an on/off switch. In addition, a switch operation section for operating the on/off switch via a spring member is provided in the upper case that covers the lower case. According to this configuration, the display section and the display section are provided on the printed wiring board. Since it is equipped with an electronic circuit to display the weight and an on/off switch, the main printed wiring board and the secondary printed wiring board are provided separately as in the past, and the two are connected by a cord. The number of parts has been reduced compared to previous models, and as a result, assembly work can be done rationally, and inspection of whether or not the electric switch is displayed on the display can be done by simply turning the printed wiring board on and off. By being equipped with a switch, this can be done extremely easily using only a printed wiring board.

DESCRIPTION OF EMBODIMENTS Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 7. In the figure, the 11th fixed frame is a fixed frame, and the fixed frame 11 is a movable frame having a substantially C-shape.The movable frame 12 is also substantially C-shaped. Further, plate springs 13 and 14 are suspended and fixed to the upper and lower ends of the fixed frame 11 and the movable frame 12 using screws or the like. Reference numeral 16 denotes an L-shaped support plate on the left side, and the fixed frame 1 is located inside the vertical surface of this support plate 16.
Reference numeral 016 to which the movable frame 12 is fixed with screws or the like is an L-shaped support plate on the right side, and the movable frame 12 is fixed to the vertical surface of this support plate 16 with screws or the like. Seventeenth, a fixed electrode plate fixed to the lower side of the horizontal surface of the support plate 16 via an insulating plate 18 with rivets, etc., and the fixed electrode plate 17 is located below the leaf spring 14 at the lower end. Reference numeral 19 denotes a movable electrode plate fixed to the upper side of the horizontal surface of the support plate 16 with an insulating plate 2o through an insulating plate 2o, and the movable electrode plate 19 faces the fixed electrode plate 17 and is substantially parallel to the movable electrode plate 19. 02
Reference numeral 1 denotes an upper plate stand fixed to the vertical surface of the L-shaped support plate 16 on the right side with screws or the like, and this upper plate stand 21 is located above the leaf spring 13 at the upper end.

Reference numeral 22 denotes a fixed shielding plate fixed to the upper side of the horizontal surface of the L-shaped support plate 16 on the left side with the fixed electrode plate 17 using screws, etc., and 23 is the lower side of the horizontal surface of the L-shaped support plate 16 on the right side. The movable shielding plate 23 is fixed together with the movable electrode plate 19 with screws or the like, and the movable shielding plate 23 and the fixed shielding plate 22 shield the fixed electrode plate 17 and the movable electrode plate 19 in the vertical direction. The leaf springs 13 and 14, the fixed electrode plate 17, the movable electrode plate 19, the upper plate stand 21, the fixed shielding plate 22, and the movable shielding plate 23 are attached so as to be substantially parallel to each other. Still fixed electrode plate 17, movable electrode plate 1
9 and the fixed shielding plate 22 are connected to the electric control unit by a cord 24°25.26.027 is a lower case to which the fixed frame 11 is fixed, and to this lower case 27, a printed wiring board 28 is fixed. There is. And this printed wiring board 28
As shown in FIGS. 4 and 6, there is a display section 29, an electronic circuit (not shown) for displaying the weight on the display section 29, an on switch 30a, and an off switch 3ob. Equipped with I7. 1. The lower case 271C
forms a battery case 31 that houses a power supply battery. 32 is a case detachably attached to the lower case 27 so as to cover the lower case 27, and the upper case 32 has the on switch 30a and the off switch 3ob.
Switch operating parts 33a, 33b are provided at positions facing opposite to the switch operating parts 33a, 33b, and spring members 34a, 34b are provided to control the on switch 30a and the off switch 3ob by operating the switch operating parts 33a, 33b. It is installed. The spring members 34a and 34b are made of synthetic resin, rubber, plate springs, etc., and are shown in FIGS. 4 and 6.
It is constructed in the shapes shown in Figures 6 and 7, ♂, b, c, and d. Note that 36 is an upper plate attached to the upper plate stand 21.

The operation will be explained in the following configuration. When an object to be weighed is placed on the top [1136] attached to the top table 21, the plate springs 13, 14 are deformed via the support plate 16 and the movable frame 12, and the support plate 16 moves to move the movable electrode integrated therewith. Board 1
9 also moves. As a result, the fixed electrode plate 17 and the movable electrode plate 19
Since the gap between the two electrodes changes, the capacitance between the two electrodes changes. This amount of change is converted into an electric signal by an electronic circuit installed on the printed wiring board 28, and the weight of the object to be weighed is displayed on the display section 29.

To operate the switches 30a and 30b, press one of the switch operating parts 33a, the spring member 34a will go down, and lightly press the on switch 30a to turn the switch on. When the object to be weighed is placed on the pan 36, the weight of the object to be weighed is displayed on the display section 29 by the above-described operation. After this measurement, remove the object to be weighed placed on the upper part 35 and press the other operation part 33b, the spring part 34b will go down and lightly press the off switch 3ob to turn it off. Make it.

Effects of the Invention As described above, according to the present invention, the lower case includes a display section,
The electronic circuit that displays the weight on this display and the on/off
A printed wiring board equipped with an off switch is fixed, and a switch operating section for operating the on/off switch via a spring member is provided in the upper case that covers the lower case. Compared to a system in which the board and sub-printed wiring board are provided separately and the two are connected by a cord, the number of parts can be reduced, and as a result, assembly work can be carried out rationally.
By equipping the printed wiring board with an on/off switch, we can test whether the weight is displayed on the display.
This can be easily done using only a printed wiring board.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view showing a conventional capacitance type electronic scale, Fig. 2 is a side sectional view of a capacitance type electronic scale showing an embodiment of the present invention, and Fig. 3 is the same electronic scale. A top view with the upper case removed, Figure 4 is a view taken in the direction of arrow A in Figure 2, Figure 6 is a view of the
6 is a side sectional view showing the configuration of the switch section of the electronic scale, FIG. 7 is a spring member of the switch section, δ is a top view, and b is a front view, C is a bottom view, and d is a sectional view. 11... Fixed frame, 12...°/° Movable frame, 1
3.14...Plate spring, 17...Fixed electrode plate, 1B...Insulating plate, 19...Movable electrode plate, 20...・Insulating board, 21...Top plate stand, 27...Lower case, 28...Printed wiring board, 29...Display section, 30a, 30
b...On, off switch, 32...
Upper case, 33a. 33b...Switch operation section, 34a, 34b.
...Spring member. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (1)

[Claims] A fixed frame, a movable frame, a plate spring suspended and fixed to the upper and lower ends of the movable frame and the fixed frame, and a plate spring attached to the fixed frame side through an insulating plate so as to be substantially parallel to the plate spring. a fixed electrode plate, a movable electrode plate mounted on the movable frame side through an insulating plate so as to face the fixed electrode plate and be substantially parallel to each other, and a movable electrode plate located above the leaf spring at the upper end. The lower case is equipped with an upper plate stand attached to the movable frame side, a lower case to which the fixed frame is fixed, and an upper case that covers the lower case. A static electronic circuit comprising: a printed wiring board equipped with an electronic circuit for displaying the on/off switch and an on/off switch; Capacitive electronic scale.