Patent US4912975A successfully refreshed from Google Patents.
US4912975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-heated flow measuring apparatus having improved response characteristics
Assignee: Denso Corp
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Filing: 1989-01-25
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Granted: 1990-04-03
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Expires: 2009-01-25
Abstract
Abstract In a direct-heated flow measuring apparatus including a substrate having a film resistance pattern and a supporting member for supporting the substrate, the supporting member has good heat dissipation characteristics. Provided between the substrate and the supporting member is a heat transfer throttling portion.
Inventors
- 👤 Minoru Ohta
- 👤 Kazuhiko Miura
- 👤 Seizi Huzino
- 👤 Kenji Kanehara
- 👤 Tadashi Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/6842; G01F1/688; G01F1/69; G01F1/692
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
371 words
Flow rate measuring apparatus for measuring the flow rate within an intake air passage of an internal combustion engine, comprising: a substrate; a supporting plate, fixed to said intake air passage, for supporting at least one end of said substrate in the longitudinal direction thereof; a film resistance pattern having a first resistance portion having a high resistance located partially on a portion of said substrate apart from said end thereof, and a second resistance portion having a low resistance located on said substrate, said second resistance portion being connected to said first resistance portion and extending to a portion of said substrate near to said end thereof; an adiabatic member, disposed between said substrate and said supporting plate, said adiabatic member being partially in contact with only one part of a surface of said substrate opposing said supporting plate and only one part of a surface of said supporting member opposing said substrate; electric conductive means, provided on said supporting plate and extending to a portion thereof near to said end of said substrate, for leading electric power to said film resistance pattern; at least one electric conductive wire, linked by wire bonding between a portion of said second resistance portion of said film resistance pattern and a portion of said electric conductive means, for electrically connecting said film resistance pattern to said electric conductive means, said electric conductive wire being in contact with only said portion of said second resistance portion and only said portion of said electric conductive means; covering means for covering said portion of said second resistance portion, said portion of said electric conductive means, and said electric conductive wire by sandwiching same between said substrate and said supporting plate, to protect said portion of said second resistance portion, said portion of said electric conductive means, and said electric conductive wire, an air gap being maintained between said covering means and said substrate and said supporting plate to thereby prevent contact between said covering means and said electric conductive wire; and electric power control means, connected via said electric conductive means and said electric conductive wire to said film resistance pattern, for controlling the heat generated by said first resistance portion of said film resistance pattern.
Claim 2
Dependent Claim
371 words
Flow rate measuring apparatus for measuring the flow rate within an intake air passage of an internal combustion engine, comprising: a substrate; a supporting plate, fixed to said intake air passage, for supporting at least one end of said substrate in the longitudinal direction thereof; a film resistance pattern having a first resistance portion having a high resistance located partially on a portion of said substrate apart from said end thereof, and a second resistance portion having a low resistance located on said substrate, said second resistance portion being connected to said first resistance portion and extending to a portion of said substrate near to said end thereof; an adiabatic member, disposed between said substrate and said supporting plate, said adiabatic member being partially in contact with only one part of a surface of said substrate opposing said supporting plate and only one part of a surface of said supporting member opposing said substrate; electric conductive means, provided on said supporting plate and extending to a portion thereof near to said end of said substrate, for leading electric power to said film resistance pattern; at least one electric conductive wire, linked by wire bonding between a portion of said second resistance portion of said film resistance pattern and a portion of said electric conductive means, for electrically connecting said film resistance pattern to said electric conductive means, said electric conductive wire being in contact with only said portion of said second resistance portion and only said portion of said electric conductive means; covering means for covering said portion of said second resistance portion, said portion of said electric conductive means, and said electric conductive wire by sandwiching same between said substrate and said supporting plate, to protect said portion of said second resistance portion, said portion of said electric conductive means, and said electric conductive wire, an air gap being maintained between said covering means and said substrate and said supporting plate to thereby prevent contact between said covering means and said electric conductive wire; and electric power control means, connected via said electric conductive means and said electric conductive wire to said film resistance pattern, for controlling the heat generated by said first resistance portion of said film resistance pattern.
Claim 3
Dependent Claim
24 words
An apparatus as set forth in claim 1, wherein said covering means has at least a curled edge to protect said electric conductive wire.
Claim 4
Dependent Claim
21 words
An apparatus as set forth in claim 1, further comprising an adiabatic member inserted between said covering means and said substrate.
Claim 5
Dependent Claim
24 words
An apparatus as set forth in claim 1, wherein said adiabatic member is inserted between an edge of said supporting plate and said substrate.
Claim 6
Dependent Claim
57 words
An apparatus as set forth in claim 1, further comprising a temperature-compensating resistor for detecting the temperature of non-heated fluid in the fluid stream, said temperature-compensating resistor being substantially unaffected by the heat generated from said film resistance pattern, said electric power control means controlling the heat generated by said film resistance pattern and said temperature-compensating resistor.
Claim 7
Dependent Claim
33 words
An apparatus as set forth in claim 1, wherein said supporting plate is made of a material having a larger thermal conductivity and a smaller specific heat than those of said adiabatic member.
Claim 8
Dependent Claim
13 words
An apparatus as set forth in claim 6, wherein said material is metal.
Claim 9
Dependent Claim
17 words
An apparatus as set forth in claim 7, wherein said metal is one of aluminum and copper.
Claim 10
Dependent Claim
16 words
An apparatus as set forth in claim 1, wherein said substrate is made of monocrystalline silicon.
Claim 11
Dependent Claim
17 words
An apparatus as set forth in claim 1, wherein said film resistance pattern is made of Pt.
Claim 12
Dependent Claim
48 words
An apparatus as set forth in claim 1, further comprising a mold element provided between said cover means and said supporting plate, for preventing a linkage portion between said electric conductive wire and said conductive means from exposure to air within said passage, to protect said linkage portion.
Claim 13
Dependent Claim
205 words
Flow rate measuring apparatus for measuring the flow rate within an intake air passage of an internal combustion engine, comprising: a substrate; a film resistance pattern formed partially on said substrate; a supporting plate, fixed to said air passage, for supporting said substrate; an adiabatic member, disposed between said substrate and said supporting plate, said adiabatic member being partially in contact with both one part of a surface of said substrate and one part of a surface of said supporting member opposing said substrate; electric conductive means, provided on said supporting plate for leading electric power to said film resistance pattern; at least one electric conductive wire linked by wire bonding between said film resistance pattern and said electric conductive means for electrically connecting said film resistance pattern to said electric conductive means; means for covering said electric conductive wire to protect said electric conductive wire; and electric power control means, connected via said electric conductive means and said electric conductive wire to said film resistance pattern, for controlling the heat generated by said first resistance portion of said film resistance pattern, wherein said adiabatic member is made of a material having a smaller thermal conductivity than those of said supporting plate and said substrate.
Claim 14
Dependent Claim
205 words
Flow rate measuring apparatus for measuring the flow rate within an intake air passage of an internal combustion engine, comprising: a substrate; a film resistance pattern formed partially on said substrate; a supporting plate, fixed to said air passage, for supporting said substrate; an adiabatic member, disposed between said substrate and said supporting plate, said adiabatic member being partially in contact with both one part of a surface of said substrate and one part of a surface of said supporting member opposing said substrate; electric conductive means, provided on said supporting plate for leading electric power to said film resistance pattern; at least one electric conductive wire linked by wire bonding between said film resistance pattern and said electric conductive means for electrically connecting said film resistance pattern to said electric conductive means; means for covering said electric conductive wire to protect said electric conductive wire; and electric power control means, connected via said electric conductive means and said electric conductive wire to said film resistance pattern, for controlling the heat generated by said first resistance portion of said film resistance pattern, wherein said adiabatic member is made of a material having a smaller thermal conductivity than those of said supporting plate and said substrate.
Claim 15
Dependent Claim
20 words
An apparatus as set forth in claim 12, wherein said material is one of polyimid resin, ceramic, glass, and quartz.
Claim 16
Dependent Claim
26 words
An apparatus as set forth in claim 13, wherein said material is polyimid resin, and said polyimid resin has a thickness of 50 to 60 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-02 | 1993-10-02 | 1994-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-02 | 1997-10-02 | 1998-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-02 | 2001-10-02 | 2002-04-03 | $7700.00 | Window Closed / Lapsed |