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A multi-point type weighing equipment and a manufacturing method for the same

A manufacturing method and multi-point technology, applied to measuring devices, instruments, weighing, etc., can solve problems such as resistance value differences

Active Publication Date: 2009-12-16
TANITA CORP
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, even if the design values ​​of the resistance values ​​of the four strain gauges 54 to 57 are exactly the same, the resistance values ​​actually differ.

Method used

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  • A multi-point type weighing equipment and a manufacturing method for the same
  • A multi-point type weighing equipment and a manufacturing method for the same
  • A multi-point type weighing equipment and a manufacturing method for the same

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Embodiment Construction

[0044]Hereinafter, a multi-point scale using four pressure sensors 10, 20, 30, 40 will be described as the best mode required for carrying out the present invention. Each pressure sensor has the same specification, and four strain gauges are provided on each pressure sensor. The warping body on each pressure sensor is strained by the load applied to each pressure sensor, and thus the resistance values ​​of the four strain gauges fluctuate. Therefore, if a Wheatstone bridge circuit composed of these four strain gauges (resistors) is formed, the zero balance of the Wheatstone bridge circuit will be unbalanced due to the fluctuation of the resistance value, and an output voltage will be obtained.

[0045] The cross-sectional structure of each pressure sensor and Figure 4 Same as shown. That is to say, each pressure sensor is equipped with a crooked body, a platform, and a base of the same shape, such as Figure 4 As shown, there are 4 strain gauges on each crooked body. Here, ...

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Abstract

The invention relates to a multi-point type weighing equipment and a manufacturing method of the same. The time and cost which requires the adjustment of a load cell in case of manufacturing the multi-point type weighing equipment using a plurality of load cells are fully reduced. Four strain gauges comprise a Wheatstone bridge circuit for every load cell, and it has composition that these were connected in parallel. When all the load cells are not loaded, in order to make small the variation of the load cell of the output voltage depending on temperature between CD in case of input voltage being applied between AB as much as possible, temperature compensator (182) which is the first resistance for adjustment is provided in the Wheatstone bridge circuit corresponding to load cell (10). Also, when all the load cells are not loaded, in order to make minimum the absolute value of the output voltage between CD in case of input voltage being applied between AB as much as possible, zero balance adjustment resistance (183), which is the second resistance for adjustment, is also provided in this Wheatstone bridge circuit.

Description

technical field [0001] The invention relates to a multi-point balance, which is composed of a plurality of pressure sensors that can convert the strain generated by load bearing into electrical signals. In addition, it also relates to a manufacturing method of the multi-point scale. Background technique [0002] There are various types of scales (weighers) that measure the weight of various objects. In particular, scales using pressure sensors are widely used because of their high accuracy and the ability to obtain electrical outputs. [0003] Figure 4 Shown is an example of a cross-sectional structure of a pressure sensor 50 used in a scale. exist Figure 4 A lifter 53 is fixed between the platform 51 and the base 52 of the shape shown in (a), and strain gauges 54 to 57 of uniform specifications are joined at four points on the surface of the lifter 53 . In the strain gauges 54 to 57, the resistance value thereof fluctuates due to strain. To the platform 51, base 52 al...

Claims

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Application Information

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IPC IPC(8): G01G3/13G01G3/14G01G3/18
CPCG01G3/1418G01G3/1404
Inventor 本田晃久
Owner TANITA CORP
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