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Variable resistor

A resistor and variable technology, used in adjustable resistors, resistors, resistor components, etc., can solve problems such as improper bonding and poor sealing, to prevent incorrect bonding or removal, and ensure performance effect

Inactive Publication Date: 2004-06-16
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If assembly is performed with the O-ring slipped in place, the O-ring will not engage properly at that point, resulting in a poor seal

Method used

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  • Variable resistor
  • Variable resistor
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Figure 1 to Figure 8 A variable resistor according to a first embodiment of the present invention is shown. The variable resistor 1 includes a case 2 ; sliders 9 , 10 and 11 ; lead terminals 15 , 16 and 17 ; a rotor 18 ; a resistor substrate 24 ;

[0037] Through polyamide-type thermoplastic resins such as 46 nylon with high heat resistance, polybenzene sulfide, polybutylene terephthalate, liquid crystal polymer, or thermal insulation such as epoxy resin, hexadiene titanate, etc. The cured resin forms the housing 2 which is stable in high temperature environments and resistant to heat during welding. A bottom recess 3 having a circular cross section as an example of an accommodation space is formed in the housing 2 and is designed so that the rotor 18 accommodated in the recess 3 can freely rotate. A tapered guide surface 3 a for guiding the O-ring 28 is formed at the upper edge of the recess 3 of the housing 2 . Engagement holes 4 for engagement with engaging claws...

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PUM

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Abstract

A variable resistor includes sliders fixed to the bottom of the concavity of a case, a rotor having an engaging portion for engagement with a tool, a resistor substrate having a resistor and an electrode on the underside thereof, capable of being sliding-contacted with the slider, and attached to the underside of the rotor, and an o ring performing the seal between the inner peripheral surface of the concavity of the case and the outer peripheral surface of the rotor. The rotor has a step portion formed in the outer peripheral surface on the underside thereof with the lower-side portion of the step portion having a short diameter. The resistance board is so formed into a disc which is larger in diameter than the small-diameter part of the step part of the rotor, by fixing the resistance board to the lower end surface of the rotor for preventing the O-ring from dropping out.

Description

technical field [0001] The present invention relates to a sealing structure suitable for variable resistors, in particular to a small-sized variable resistor used in measuring instruments, communication equipment, sensors and other industrial devices or equipment. Background technique [0002] In recent years, there is a general trend that devices or equipment are being miniaturized and downsized. Miniaturized production of variable resistors, which are internal components of devices or equipment, has been accelerated. In some cases, devices or equipment are used in high humidity environments. Correspondingly, for the variable resistor, it is required to have a waterproof and moisture-proof structure. [0003] Generally, a variable resistor includes a case having a concave portion, a resistor substrate having a resistor formed on its surface, which is provided on the bottom surface of the concave portion of the case, and a rotor with a rotor fixed therebelow and rotates. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C10/32H01C10/00H01C10/34
CPCH01C10/34
Inventor 大西克博上田幸宪
Owner MURATA MFG CO LTD
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