Pressure transducer
First Claim
1. A pressure transducer comprising:
- a semiconductor diaphragm having a predetermined conductivity and including a strain sensitive region adapted to be elastically deformed by means of pressure applied thereto and a fixing region;
strain sensitive elements insulatingly disposed upon said diaphragm and relative to the crystallographic directions of said diaphragm so as to exhibit high sensitivity and within the vicinity of the central and peripheral portions of said strain sensitive region;
lead portions, for transmitting electrical signals, insulatingly mounted upon said diaphrahm and extending from said strain sensitive region to one side of an end portion in said fixing region for electrically interconnecting said central and peripheral strain sensitive elements in order to form a bridge circuit which includes said central and outer strain sensitive elements and said lead portions;
electrodes respectively provided upon said lead portions within said one side of the end portion in said fixing region;
a supporting member including a supporting portion for supporting said semiconductor diaphragm by means of said fixing region of said diaphragm and a leading portion for conducting said electrical signals therethrough; and
lead wires, connected to said electrodes and to external processing apparatus, disposed within and through said leading portion of said supporting member.whereby said electrical signals detected by means of said strain sensitive elements are conducted to said electrodes by said lead portions and further conducted outwardly of said transducer by said lead wires.
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Accused Products
Abstract
A pressure transducer includes a semiconductor diaphragm of a predetermined conductivity having a strain sensitive region capable of being elastically deformed by means of the external pressure applied thereto, a fixing region having a high degree of rigidity, central and peripheral strain sensitive elements disposed along the crystallographic directions thereof and exhibiting high sensitivity and which are respectively insulatingly disposed within the vicinity of the central and peripheral portions of the strain sensitive region of the diaphragm, lead portions insulatingly disposed upon the diaphragm and extending from the strain sensitive region to one side of an end portion in the fixing region for transmitting electrical signals from the sensitive elements, the leads being connected to the central and peripheral strain sensitive elements at one end thereof in order to collectively form a bridge circuit, and electrodes respectively provided upon the other end portions of the lead portions and within the end portion of the fixing region. A supporting member includes a supporting portion for supporting the semiconductor diaphragm through means of the fixing region of the diaphragm, and a leading portion for conducting the electrical signals therethrough, lead wires being connected to the electrodes of the lead portions and being passed through the leading portion of the supporting member. The pressure transducer transmits the electrical signals detected by means of the strain sensitive elements to the electrodes by means of the lead portions and in turn conducts the electrical signals through the lead wires to the processing apparatus. As the pressure transducer does not require internal space for connecting the lead wires to the strain sensitive elements, the pressure transducer is extremely thin and compact and is suitable for mass-production.
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Citations
20 Claims
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1. A pressure transducer comprising:
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a semiconductor diaphragm having a predetermined conductivity and including a strain sensitive region adapted to be elastically deformed by means of pressure applied thereto and a fixing region; strain sensitive elements insulatingly disposed upon said diaphragm and relative to the crystallographic directions of said diaphragm so as to exhibit high sensitivity and within the vicinity of the central and peripheral portions of said strain sensitive region; lead portions, for transmitting electrical signals, insulatingly mounted upon said diaphrahm and extending from said strain sensitive region to one side of an end portion in said fixing region for electrically interconnecting said central and peripheral strain sensitive elements in order to form a bridge circuit which includes said central and outer strain sensitive elements and said lead portions; electrodes respectively provided upon said lead portions within said one side of the end portion in said fixing region; a supporting member including a supporting portion for supporting said semiconductor diaphragm by means of said fixing region of said diaphragm and a leading portion for conducting said electrical signals therethrough; and lead wires, connected to said electrodes and to external processing apparatus, disposed within and through said leading portion of said supporting member. whereby said electrical signals detected by means of said strain sensitive elements are conducted to said electrodes by said lead portions and further conducted outwardly of said transducer by said lead wires. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification