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JP4055697B2 - Infrared light source - Google Patents
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JP4055697B2 - Infrared light source - Google Patents

Infrared light source Download PDF

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JP4055697B2
JP4055697B2 JP2003376072A JP2003376072A JP4055697B2 JP 4055697 B2 JP4055697 B2 JP 4055697B2 JP 2003376072 A JP2003376072 A JP 2003376072A JP 2003376072 A JP2003376072 A JP 2003376072A JP 4055697 B2 JP4055697 B2 JP 4055697B2
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resistor
light source
film
infrared light
substrate
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JP2005140594A (en
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久則 与倉
貴彦 吉田
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Denso Corp
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02Details
    • G01J3/10Arrangements of light sources specially adapted for spectrometry or colorimetry
    • G01J3/108Arrangements of light sources specially adapted for spectrometry or colorimetry for measurement in the infrared range
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/20Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater
    • H05B3/22Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible
    • H05B3/26Heating elements having extended surface area substantially in a two-dimensional [2D] plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10NELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N15/00Thermoelectric devices without a junction of dissimilar materials; Thermomagnetic devices, e.g. using the Nernst-Ettingshausen effect
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/011Heaters using laterally extending conductive material as connecting means
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/013Heaters using resistive films or coatings
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017Manufacturing methods or apparatus for heaters
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/032Heaters specially adapted for heating by radiation heating

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

本発明は、基板にメンブレンとしての薄膜部を備え、当該薄膜部に形成された抵抗体を通電して発熱させることにより、赤外線を発光させる赤外線光源に関するものである。   The present invention relates to an infrared light source that includes a thin film portion as a membrane on a substrate and emits infrared light by energizing a resistor formed in the thin film portion to generate heat.

従来、赤外線光源と、当該赤外線光源より発せられた赤外線を検出する赤外線検出素子とにより構成され、特定波長の赤外線吸収量により被測定ガスの種類と濃度を測定するガスセンサが知られている。   2. Description of the Related Art Conventionally, a gas sensor is known that includes an infrared light source and an infrared detection element that detects infrared light emitted from the infrared light source, and measures the type and concentration of a gas to be measured based on the amount of infrared absorption at a specific wavelength.

このようなガスセンサにおいては、赤外線光源から放射される赤外線のエネルギーが大きいほど、赤外線検出素子の出力変化が大きくなり、ガスセンサのセンサ感度が向上する。そこで、良好なセンサ感度を確保するために必要な、所定の赤外線エネルギーを放射する赤外線光源として、例えば特許文献1に開示される光源が知られている。   In such a gas sensor, the greater the infrared energy emitted from the infrared light source, the greater the change in output of the infrared detection element, and the sensor sensitivity of the gas sensor is improved. Therefore, for example, a light source disclosed in Patent Document 1 is known as an infrared light source that emits predetermined infrared energy necessary for ensuring good sensor sensitivity.

この赤外線光源は、基板にマイクロブリッジ状に形成されたフィラメント(抵抗体)を有しており、当該抵抗体の表面に、発光される赤外線波長帯域によらず赤外線放射率を安定化させる放射率安定化部材(例えばシリコニット)を有している。   This infrared light source has a filament (resistor) formed in the shape of a microbridge on a substrate, and the emissivity that stabilizes the infrared emissivity on the surface of the resistor regardless of the wavelength band of emitted infrared light. It has a stabilizing member (for example, siliconit).

従って、通電して抵抗体を発熱させることにより赤外線を放射する際に、放射率安定化部材を介することで、波長依存性が低く、安定した強度の赤外線を放射することができる。
特開2001−221689号公報
Therefore, when the infrared rays are emitted by energizing the resistor to generate heat, the infrared rays having a low wavelength dependency and a stable intensity can be emitted through the emissivity stabilizing member.
Japanese Patent Application Laid-Open No. 2001-221689

しかしながら、特許文献1に示す赤外線光源において、抵抗体は、ブリッジ状に形成されており、基板(シリコン基板)に形成された堀上の中空部位だけでなく、その一部が直接シリコン基板と接触する構造となっている。さらに、放射率安定化部材も、抵抗体の表面に設けられ、その一部がシリコン基板と接する構造となっている。   However, in the infrared light source shown in Patent Document 1, the resistor is formed in a bridge shape, and not only the hollow portion on the moat formed in the substrate (silicon substrate) but also a part thereof directly contacts the silicon substrate. It has a structure. Furthermore, the emissivity stabilizing member is also provided on the surface of the resistor, and a part thereof is in contact with the silicon substrate.

従って、本来であれば赤外線検出素子に向けて放射される赤外線エネルギーの一部が、抵抗体及び放射率安定化部材を介して基板側に伝達される。すなわち、赤外線の放射効率が低下するという問題がある。   Therefore, a part of the infrared energy radiated toward the infrared detecting element is transmitted to the substrate side through the resistor and the emissivity stabilizing member. That is, there is a problem that the radiation efficiency of infrared rays decreases.

本発明は上記問題点に鑑み、赤外線の放射効率を向上した赤外線光源を提供することを目的としている。   In view of the above problems, an object of the present invention is to provide an infrared light source with improved infrared radiation efficiency.

上記目的を達成する為に請求項1に記載の赤外線光源は、基板に設けられたメンブレンとしての薄膜部と、薄膜部に設けられ、通電により発熱する抵抗体と、薄膜部上に設けられ、抵抗体の赤外線放射率以上の赤外線放射率を有し、抵抗体からの熱を受けて赤外線を発光する高放射性膜とを備え、抵抗体及び高放射性膜が、薄膜部の形成領域内のみに設けられ、高放射性膜は、薄膜部の形成領域端に対して所定の間隙をもって設けられると共に、少なくとも抵抗体の形成領域上に設けられていることを特徴とする。 In order to achieve the above object, the infrared light source according to claim 1 is provided on a thin film part as a membrane provided on a substrate, a resistor provided on the thin film part and generating heat by energization, and the thin film part, It has an infrared emissivity that is equal to or higher than the infrared emissivity of the resistor, and has a high-radiation film that emits infrared rays by receiving heat from the resistor. The high-radiation film is provided with a predetermined gap with respect to the end of the thin film portion forming region and is provided at least on the resistor forming region .

このように、本発明の赤外線光源によると、メンブレンとしての薄膜部の形成領域内のみに抵抗体及び高放射性膜が設けられている。すなわち、抵抗体及び高放射性膜は基板に対して熱分離されており、基板側に逃げる熱量が減少する。また、高放射性膜は抵抗体以上の赤外線放射率を有しており、抵抗体からの熱を受けて効率良く赤外線を放射する。従って、従来よりも赤外線光源の赤外線放射効率が向上される。さらには、高放射性膜の形成領域は、少なくとも抵抗体の形成領域上に設けられていることが好ましく、薄膜部の形成領域端に対して所定の間隙をもって設けられていることが好ましい。高放射性膜が、薄膜部の形成領域端まで設けられた場合、積層方向において、基板と高放射性膜とが接する位置関係となる。従って、高放射性膜は、基板側に逃げる熱量を低減するために、薄膜部の形成領域端に対して、所定の間隙をもって設けられることが好ましい。 As described above, according to the infrared light source of the present invention, the resistor and the highly radioactive film are provided only in the formation region of the thin film portion as the membrane. That is, the resistor and the highly radioactive film are thermally separated from the substrate, and the amount of heat escaping to the substrate side is reduced. Further, the high emissivity film has an infrared emissivity higher than that of the resistor, and efficiently radiates infrared rays by receiving heat from the resistor. Therefore, the infrared radiation efficiency of the infrared light source is improved as compared with the conventional case. Furthermore, the high-radiation film formation region is preferably provided at least on the resistor formation region, and is preferably provided with a predetermined gap with respect to the thin film portion formation region end. When the highly radioactive film is provided up to the end of the thin film portion forming region, the substrate and the highly radioactive film are in a positional relationship in the stacking direction. Therefore, in order to reduce the amount of heat that escapes to the substrate side, the high-radiation film is preferably provided with a predetermined gap with respect to the end of the thin film portion formation region.

請求項に記載のように、抵抗体形成領域を覆いつつ、抵抗体形成領域よりも広い領域に設けられていることがより好ましい。 As described in claim 2 , it is more preferable that the resistor is formed in a region wider than the resistor forming region while covering the resistor forming region.

このように高放射性膜が設けられると、高放射性膜は、基板に対して熱分離された構造を保ちつつ、抵抗体から発せられたより多くの熱を効率良く吸収することができる。すなわち、その温度に対応した赤外線を効率良く放射することができる。   When the highly radioactive film is provided in this way, the highly radioactive film can efficiently absorb more heat generated from the resistor while maintaining a structure that is thermally separated from the substrate. That is, infrared rays corresponding to the temperature can be efficiently emitted.

より具体的には、請求項に記載のように、基板上に、電極としてのパッド部を有する配線部がさらに設けられ、配線部が薄膜部まで伸延し、抵抗体と電気的に接続されていると、薄膜部のみに抵抗体を有する赤外線光源の構成を実現することができる。 More specifically, as described in claim 3 , a wiring portion having a pad portion as an electrode is further provided on the substrate, and the wiring portion extends to the thin film portion and is electrically connected to the resistor. In this case, the configuration of an infrared light source having a resistor only in the thin film portion can be realized.

高放射性膜としては、例えば請求項に記載のように、カーボンブラック、金、白金、クロム、及び炭化珪素の少なくともいずれかを材料として形成されたものを適用することができる。 As the highly radioactive film, for example, a film formed using at least one of carbon black, gold, platinum, chromium, and silicon carbide as described in claim 4 can be applied.

なかでも、カーボンブラック、及び黒化処理された金(金黒)若しくは白金(白金黒)は、赤外線放射率が高いので好ましい。   Among these, carbon black, and blackened gold (gold black) or platinum (platinum black) are preferable because of high infrared emissivity.

ここで、薄膜部を構成する基板の構造として、請求項に記載のように、基板は薄膜部の形成面側のみに開口していても良いし、請求項に記載のように、薄膜部の形成面側のみでなく、薄膜部の形成面の裏面側にも開口していても良い。 Here, as the structure of the substrate constituting the thin film portion, as described in claim 5 , the substrate may be opened only on the formation surface side of the thin film portion, or as described in claim 6 , the thin film portion The opening may be provided not only on the surface where the film is formed but also on the back surface side of the surface where the thin film part is formed.

また、高放射性膜は、基板の開口部位に対峙する薄膜部表面に設けられても良いが、この場合、放射された赤外線の一部が開口部位周囲の基板に吸収されてしまう。従って、請求項に記載のように、基板の開口部位に対峙する薄膜部表面の裏面に高放射性膜を備えると良い。 In addition, the highly radioactive film may be provided on the surface of the thin film portion facing the opening portion of the substrate, but in this case, part of the emitted infrared light is absorbed by the substrate around the opening portion. Therefore, as described in claim 7, it is preferable to provide a highly radioactive film on the back surface of the surface of the thin film portion facing the opening portion of the substrate.

請求項に記載のように、基板が半導体基板であれば、従来の半導体製造技術である選択エッチング技術を利用して、請求項1〜のいずれかに記載の赤外線光源を安価に製造することができる。 If the substrate is a semiconductor substrate as described in claim 8 , the infrared light source according to any one of claims 1 to 7 is manufactured at low cost using a selective etching technique that is a conventional semiconductor manufacturing technique. be able to.

尚、請求項1〜のいずれかに記載の赤外線光源は、請求項に記載のように、特定波長の赤外線吸収量により被測定ガスの種類および濃度を測定する、赤外線検知式ガスセンサの光源として好適である。 In addition, the infrared light source in any one of Claims 1-8 is a light source of the infrared detection type gas sensor which measures the kind and density | concentration of to-be-measured gas with the infrared absorption amount of a specific wavelength, as described in Claim 9. It is suitable as.

以下、本発明の実施の形態を、図に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(第1の実施形態)
図1は、本実施形態における赤外線光源の概略構成を示す図であり、(a)は平面図、(b)は(a)のA−A断面における断面図である。尚、図1(a)においては、便宜上、抵抗体、抵抗体と電極とを接続する配線部、及び基板上面における上面開口部を破線にて図示している。
(First embodiment)
1A and 1B are diagrams illustrating a schematic configuration of an infrared light source in the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along a line AA in FIG. In FIG. 1A, for convenience, a resistor, a wiring portion that connects the resistor and the electrode, and an upper surface opening on the upper surface of the substrate are illustrated by broken lines.

図1(b)に示すように、赤外線光源100は、基板10と、当該基板10に設けられ、抵抗体を含むメンブレンとしての薄膜部20と、当該薄膜部20表面に設けられた高放射性膜30とにより構成される。   As shown in FIG. 1B, the infrared light source 100 includes a substrate 10, a thin film portion 20 as a membrane including a resistor provided on the substrate 10, and a highly radioactive film provided on the surface of the thin film portion 20. 30.

基板10は、シリコンからなる半導体基板であり、薄膜部20の形成領域に対応した開口部11を有している。本実施形態において、開口部11は矩形状の領域をもって開口されており、この開口面積が基板10の上面側へ行くほど縮小され、基板10の上面では、図1(a)に破線にて示されるような矩形状の領域(上面開口部11a)となっている。従って、抵抗体を含む薄膜部20は、基板10に対して上面開口部11a上に浮いた状態に形成されており、赤外線光源100の他の部位と比べて膜厚が薄く形成されているので、基板10と熱分離することができ、抵抗体を効率よく発熱させることができる。   The substrate 10 is a semiconductor substrate made of silicon and has an opening 11 corresponding to the formation region of the thin film portion 20. In this embodiment, the opening 11 is opened with a rectangular region, and the opening area is reduced as it goes to the upper surface side of the substrate 10. The upper surface of the substrate 10 is indicated by a broken line in FIG. This is a rectangular area (upper surface opening 11a). Therefore, the thin film portion 20 including the resistor is formed so as to float on the upper surface opening 11a with respect to the substrate 10, and is formed thinner than other portions of the infrared light source 100. The substrate 10 can be thermally separated from the substrate 10, and the resistor can be efficiently heated.

また、基板10の下面には、窒化シリコン膜12が設けられ、基板10の上面には、絶縁膜13(例えば窒化シリコン膜)が設けられている。そして、当該絶縁膜13上に、酸化シリコン膜14が設けられている。   A silicon nitride film 12 is provided on the lower surface of the substrate 10, and an insulating film 13 (for example, a silicon nitride film) is provided on the upper surface of the substrate 10. A silicon oxide film 14 is provided on the insulating film 13.

酸化シリコン膜14上の薄膜部20の形成領域内には、多結晶シリコン膜からなる抵抗体15が所定形状をもって設けられている。そして、抵抗体15には、BPSG(Boron−doped Phospho−Silicate Glass)からなる層間絶縁膜16を介して、抵抗体15と電極とを電気的に繋ぐ配線部17が接続されている。尚、図1(a),(b)において、符号15aは抵抗体15と配線部17との接続部である。   In the formation region of the thin film portion 20 on the silicon oxide film 14, a resistor 15 made of a polycrystalline silicon film is provided with a predetermined shape. The resistor 15 is connected to a wiring portion 17 that electrically connects the resistor 15 and the electrode via an interlayer insulating film 16 made of BPSG (Boron-doped Phospho-Silicate Glass). In FIGS. 1A and 1B, reference numeral 15 a is a connection portion between the resistor 15 and the wiring portion 17.

また、アルミニウムからなる配線部17は、その端部に電極としてのパッド部17aを有しており、当該パッド部17aを除いた配線部17上に保護膜18(例えば窒化シリコン膜)が設けられている。従って、本実施形態においては、積層方向において、基板10の上面開口部11a上における絶縁膜13、酸化シリコン膜14、抵抗体15、層間絶縁膜16、配線部17、及び保護膜18により薄膜部20が構成されている。   Further, the wiring portion 17 made of aluminum has a pad portion 17a as an electrode at an end thereof, and a protective film 18 (for example, a silicon nitride film) is provided on the wiring portion 17 excluding the pad portion 17a. ing. Therefore, in the present embodiment, the thin film portion is formed by the insulating film 13, the silicon oxide film 14, the resistor 15, the interlayer insulating film 16, the wiring portion 17, and the protective film 18 on the upper surface opening 11 a of the substrate 10 in the stacking direction. 20 is configured.

そして、薄膜部20の形成領域内における保護膜18上に、抵抗体15の赤外線放射率以上の赤外線放射率を有する高放射性膜30が設けられている。これにより、抵抗体15が発熱した際に、抵抗体15周囲にある薄膜部20の構成要素を介して高放射性膜30に熱が伝達され、その温度に応じて高放射性膜30は効率良く赤外線を放射する。   A high emissivity film 30 having an infrared emissivity equal to or higher than the infrared emissivity of the resistor 15 is provided on the protective film 18 in the formation region of the thin film portion 20. As a result, when the resistor 15 generates heat, heat is transmitted to the highly radioactive film 30 via the constituent elements of the thin film portion 20 around the resistor 15, and the highly radioactive film 30 efficiently transmits infrared rays according to the temperature. Radiate.

ここで、高放射性膜30の形成領域は、薄膜部20の表面(本実施形態においては薄膜部20の形成領域内における保護膜18上)であれば、薄膜部20の構成要素を介して抵抗体15の熱が伝達されるので、特に限定されるものではない。   Here, if the formation region of the highly radioactive film 30 is the surface of the thin film portion 20 (on the protective film 18 in the formation region of the thin film portion 20 in the present embodiment), a resistance is provided via a component of the thin film portion 20. Since the heat of the body 15 is transmitted, it is not particularly limited.

しかしながら、高放射性膜30は、少なくともその一部が抵抗体15の形成領域上に設けられていることが好ましく、抵抗体15の形成領域を覆いつつ、抵抗体形成領域よりも広い領域に設けられることがより好ましい。このように高放射性膜30が、積層方向における抵抗体15の直上に設けられると、抵抗体15と高放射性膜30との距離が短いので、抵抗体15の発した熱が高放射性膜30に効率良く伝達される。さらに、高放射性膜30を、基板10に対して熱分離された構造を保ちつつ、薄膜部20の形成領域内においてより広い領域に設けることで、抵抗体15から発せられたより多くの熱を効率良く吸収することができる。   However, it is preferable that at least a part of the highly radioactive film 30 is provided on the formation region of the resistor 15. The high-radiation film 30 covers the formation region of the resistor 15 and is provided in a region wider than the resistor formation region. It is more preferable. When the high radiation film 30 is provided immediately above the resistor 15 in the stacking direction as described above, the distance between the resistor 15 and the high radiation film 30 is short, so that the heat generated by the resistor 15 is applied to the high radiation film 30. It is transmitted efficiently. Furthermore, by providing the high-radiation film 30 in a wider area in the formation area of the thin film portion 20 while maintaining a structure that is thermally separated from the substrate 10, more heat generated from the resistor 15 can be efficiently generated. Can absorb well.

また、高放射性膜30は、薄膜部20の形成領域端(すなわち上面開口部11a端)に対して、所定の間隙をもって設けられていることが好ましい。薄膜部20の形成領域端まで高放射性膜30が設けられた場合、積層方向において、基板10と高放射性膜30とが接する位置関係となる。従って、高放射性膜30は、基板10側に逃げる熱量を低減するために、薄膜部20の形成領域端に対して、所定の間隙をもって設けられることが好ましい。   Moreover, it is preferable that the highly radioactive film 30 is provided with a predetermined gap with respect to the formation region end of the thin film portion 20 (that is, the upper surface opening 11a end). When the highly radioactive film 30 is provided up to the end of the region where the thin film portion 20 is formed, the substrate 10 and the highly radioactive film 30 are in a positional relationship in the stacking direction. Accordingly, it is preferable that the highly radioactive film 30 is provided with a predetermined gap with respect to the end of the thin film portion 20 formation region in order to reduce the amount of heat escaping to the substrate 10 side.

尚、本実施形態においては、図1(a)に示すように、薄膜部20の形成領域端に対して所定の間隙を有しながらも、抵抗体15の形成領域を覆いつつできるだけ広い領域に設けられている。従って、本実施形態における高放射性膜30は、抵抗体15同様、基板10と熱分離され、抵抗体15の発した熱を効率良く吸収し、赤外線として放射することができる。   In the present embodiment, as shown in FIG. 1 (a), while having a predetermined gap with respect to the end of the thin film portion 20 formation region, it covers a region as wide as possible while covering the formation region of the resistor 15. Is provided. Therefore, like the resistor 15, the highly radioactive film 30 in the present embodiment is thermally separated from the substrate 10, and can efficiently absorb the heat generated by the resistor 15 and emit it as infrared rays.

また、本実施形態における高放射性膜30は、良好な熱伝導性も有している。このような高放射性膜30を形成する材料としては、例えばカーボンブラック、金、白金、クロム、及び炭化珪素の少なくともいずれかを用いることができる。なかでも、カーボンブラック、及び黒化処理された金(金黒)若しくは白金(白金黒)は、特に赤外線放射率が高いので好適である。本実施形態における高放射性膜30は、カーボンブラックを材料として形成されている。   Moreover, the high emissivity film | membrane 30 in this embodiment also has favorable heat conductivity. As a material for forming such a highly radioactive film 30, for example, at least one of carbon black, gold, platinum, chromium, and silicon carbide can be used. Among these, carbon black and blackened gold (gold black) or platinum (platinum black) are particularly preferable because of their high infrared emissivity. The highly radioactive film 30 in the present embodiment is formed using carbon black as a material.

このように構成される赤外線光源100は、例えば図2(a),(b)に示すように、赤外線検出素子200とともに赤外線検知式ガスセンサ300(以下ガスセンサ300と示す)に適用される。尚、図2は、本実施形態の赤外線光源100をガスセンサ300に適用した際の概略構成図であり、(a)は赤外線光源100と赤外線検出素子200が対向配置される直線型、(b)は赤外線光源100と赤外線検出素子200が並んで配置される反射型を示す図である。   The infrared light source 100 configured as described above is applied to an infrared detection type gas sensor 300 (hereinafter, referred to as a gas sensor 300) together with the infrared detection element 200 as shown in FIGS. 2A and 2B, for example. FIG. 2 is a schematic configuration diagram when the infrared light source 100 of the present embodiment is applied to the gas sensor 300, (a) is a linear type in which the infrared light source 100 and the infrared detection element 200 are arranged to face each other, (b). These are figures which show the reflection type by which the infrared light source 100 and the infrared detection element 200 are arrange | positioned along with.

図2(a)に示すガスセンサ300は、赤外線光源100と赤外線検出素子200が、赤外線波長選択フィルタ310を介して、円筒状容器320の両端に互いに向き合って配置されている。赤外線光源100によって赤外線検出素子200に向かって照射された赤外線(図中の矢印方向)は、円筒状容器320内に満たされた被測定ガス中を通過する間に特定波長の赤外線が吸収され、赤外線検出素子200に到達する。このとき、被測定ガスの濃度に応じて赤外線検出素子200に到達する赤外線の強度が変わるので、それに応じて赤外線検出素子200の出力が変化し、被測定ガスの濃度が測定される。尚、図2(a)における符号330はガス出入り口である。   In the gas sensor 300 shown in FIG. 2A, the infrared light source 100 and the infrared detection element 200 are arranged to face each other at both ends of the cylindrical container 320 via the infrared wavelength selection filter 310. The infrared ray irradiated in the infrared detection element 200 by the infrared light source 100 (in the direction of the arrow in the figure) absorbs infrared rays having a specific wavelength while passing through the measurement gas filled in the cylindrical container 320, The infrared detection element 200 is reached. At this time, the intensity of the infrared rays reaching the infrared detection element 200 changes according to the concentration of the gas to be measured, so that the output of the infrared detection element 200 changes accordingly and the concentration of the gas to be measured is measured. In addition, the code | symbol 330 in Fig.2 (a) is a gas inlet / outlet.

また、図2(b)に示すガスセンサ300では、赤外線光源100と赤外線検出素子200が、円筒状容器320の一方の端部に並べて配置されている。そして、円筒状容器320のもう一方の端部は凹面鏡340となっており、赤外線光源100から照射された赤外線は、凹面鏡340で反射されて赤外線検出素子200に到達する構成となっている。従って、図2(b)に示すガスセンサ300では、赤外線が被測定ガス中を往復し、その間に特定波長の赤外線が吸収され、上記と同じ原理で被測定ガスの濃度が測定される。   Further, in the gas sensor 300 shown in FIG. 2B, the infrared light source 100 and the infrared detection element 200 are arranged side by side at one end of the cylindrical container 320. The other end of the cylindrical container 320 is a concave mirror 340, and the infrared light emitted from the infrared light source 100 is reflected by the concave mirror 340 and reaches the infrared detection element 200. Therefore, in the gas sensor 300 shown in FIG. 2B, infrared rays reciprocate in the gas to be measured, and infrared rays having a specific wavelength are absorbed during that time, and the concentration of the gas to be measured is measured according to the same principle as described above.

上述のガスセンサ300においては、赤外線光源100から放射される赤外線のエネルギーが大きいほど、赤外線検出素子200の出力変化が大きくなり、ガスセンサ300のセンサ感度が向上する。   In the gas sensor 300 described above, the greater the infrared energy emitted from the infrared light source 100, the greater the change in the output of the infrared detection element 200, and the sensor sensitivity of the gas sensor 300 is improved.

それに対し、本実施形態に示す赤外線光源100は、上述したように、メンブレンとしての薄膜部20の形成領域内に、薄膜部20を構成する抵抗体15と、抵抗体15からの熱を受けて赤外線を放射する高放射性膜30が設けられている。従って、抵抗体15及び高放射性膜30が基板10に対して熱分離されており、基板10及び基板10の開口部11側に逃げる熱量が減少する。また、高放射性膜30は抵抗体15からの熱を受けて、効率良く赤外線を放射する。従って、従来よりも赤外線光源100の赤外線放射効率が向上される。また、当該赤外線光源100を適用するガスセンサ300のセンサ感度が向上される。   On the other hand, the infrared light source 100 shown in the present embodiment receives the heat from the resistor 15 constituting the thin film portion 20 and the resistor 15 in the formation region of the thin film portion 20 as a membrane, as described above. A highly radioactive film 30 that emits infrared rays is provided. Therefore, the resistor 15 and the highly radioactive film 30 are thermally separated from the substrate 10, and the amount of heat that escapes to the opening 11 side of the substrate 10 and the substrate 10 is reduced. The highly radioactive film 30 receives heat from the resistor 15 and radiates infrared rays efficiently. Therefore, the infrared radiation efficiency of the infrared light source 100 is improved as compared with the prior art. Moreover, the sensor sensitivity of the gas sensor 300 to which the infrared light source 100 is applied is improved.

また、高放射性膜30は、薄膜部20の形成領域端に対して所定の間隙を有しながらも、抵抗体15の形成領域を覆いつつ薄膜部20の形成領域内のできるだけ広い領域に設けられている。従って、抵抗体15から発せられた熱が高放射性膜30に効率良く伝達され、高放射性膜30はその温度に応じた赤外線を赤外線検出素子200に向けて効率良く放射することができる。   Further, the highly radioactive film 30 is provided in as wide a region as possible in the formation region of the thin film portion 20 while covering the formation region of the resistor 15 while having a predetermined gap with respect to the end of the formation region of the thin film portion 20. ing. Therefore, the heat generated from the resistor 15 is efficiently transmitted to the highly radioactive film 30, and the highly radioactive film 30 can efficiently radiate infrared rays corresponding to the temperature toward the infrared detecting element 200.

また、本実施形態における高放射性膜30は良好な熱伝導性も有している。この場合、高放射性膜30は、抵抗体15から発せられ、抵抗体15の周囲にある薄膜部20の構成要素(層間絶縁膜16等)に伝達された熱を、高放射性膜30内に効率良く取り込むことができる。従って、基板10及び基板10の開口部11側に逃げる熱量がさらに減少するので、赤外線光源100の赤外線放射効率が向上される。   Further, the high emissivity film 30 in the present embodiment also has good thermal conductivity. In this case, the highly radioactive film 30 efficiently generates heat generated from the resistor 15 and transferred to the constituent elements (such as the interlayer insulating film 16) of the thin film portion 20 around the resistor 15 in the highly radioactive film 30. You can capture well. Accordingly, since the amount of heat escaping to the substrate 10 and the opening 11 side of the substrate 10 is further reduced, the infrared radiation efficiency of the infrared light source 100 is improved.

また、この場合、抵抗体15からの熱が、高放射性膜30の全体に効率良く行き渡るので、高放射性膜30の全面において温度がほぼ均一となる。従って、高放射性膜30は、その表面のどの点からも、赤外線検出素子200が安定して検出できる強度の赤外線を等方的に放射することができる。特に、本実施形態に示すように、高放射性膜30が、抵抗体15の形成領域よりも広く、且つ、薄膜部20の形成領域端と接しない範囲(すなわち薄膜部20の形成領域内においてできるだけ広い領域)に設けられる場合、赤外線光源100や赤外線検出素子200を円筒状容器320に取付ける際に、多少の取付け誤差が生じても、赤外線検出素子200は所定強度の赤外線を検出することができる。   Further, in this case, the heat from the resistor 15 spreads efficiently over the entire highly radioactive film 30, so that the temperature becomes substantially uniform over the entire surface of the highly radioactive film 30. Accordingly, the highly radioactive film 30 isotropically radiates infrared rays having an intensity that can be stably detected by the infrared detection element 200 from any point on the surface thereof. In particular, as shown in the present embodiment, the highly radioactive film 30 is wider than the region where the resistor 15 is formed and is not in contact with the end of the thin film portion 20 (that is, within the region where the thin film portion 20 is formed) When the infrared light source 100 and the infrared detection element 200 are attached to the cylindrical container 320, the infrared detection element 200 can detect infrared rays having a predetermined intensity even if some attachment error occurs. .

また、高放射性膜30が良好な熱伝導性を有しているので、抵抗体15の形状、面積によらず、使用環境に応じた任意形状の高放射性膜30を形成することができる。従って、抵抗体15は、温度分布を考慮せず、発熱量のみを設計すれば良いこととなるので、パターン設計が容易となる。   Moreover, since the high radiation film | membrane 30 has favorable thermal conductivity, the high radiation film | membrane 30 of arbitrary shapes according to a use environment can be formed irrespective of the shape and area of the resistor 15. FIG. Therefore, the resistor 15 only needs to be designed for the amount of heat generation without considering the temperature distribution, so that the pattern design becomes easy.

次に、赤外線光源100の製造方法の概略を、図1(b)に基づいて説明する。   Next, the outline of the manufacturing method of the infrared light source 100 is demonstrated based on FIG.1 (b).

先ず、シリコンからなる基板10上に、例えばCVD法により窒化シリコンからなる絶縁膜13を全面に形成する。この絶縁膜13が後述する基板10のエッチングの際に、エッチングストッパとなる。尚、絶縁膜13は、薄膜部20を構成する要素であるため、膜応力を制御して形成することが重要である。このため、必要に応じて例えば窒化シリコン膜と酸化シリコン膜からなる複合膜として形成しても良い。   First, an insulating film 13 made of silicon nitride is formed on the entire surface of the substrate 10 made of silicon by, eg, CVD. The insulating film 13 serves as an etching stopper when the substrate 10 described later is etched. Since the insulating film 13 is an element constituting the thin film portion 20, it is important to form the insulating film 13 by controlling the film stress. For this reason, it may be formed as a composite film composed of, for example, a silicon nitride film and a silicon oxide film, if necessary.

そして、絶縁膜13を覆うように酸化シリコン膜14を、例えばCVD法により形成する。この酸化シリコン膜14は、その直上に形成される多結晶シリコン膜からなる抵抗体15との密着性を高め、所定パターンの抵抗体15をエッチングにより形成する際のエッチングストッパとなる。   Then, a silicon oxide film 14 is formed so as to cover the insulating film 13 by, for example, a CVD method. This silicon oxide film 14 improves the adhesion to the resistor 15 made of a polycrystalline silicon film formed immediately above, and serves as an etching stopper when the resistor 15 having a predetermined pattern is formed by etching.

次に、酸化シリコン膜14上に、例えば多結晶シリコン膜をCVD法により形成し、リン等の不純物を導入して所定の抵抗値が得られるように調整する。そして、フォトリソグラフィー処理によりパターニングして抵抗体15を形成する。その際、図示されないが、熱酸化により、抵抗体15表面に酸化シリコン膜を形成しても良い。尚、抵抗体15の構成材料は多結晶シリコンに限定されるものではなく、それ以外にも不純物が導入された単結晶シリコンや、金属材料である金、白金等を構成材料として形成することもできる。   Next, for example, a polycrystalline silicon film is formed on the silicon oxide film 14 by a CVD method, and an impurity such as phosphorus is introduced and adjusted so as to obtain a predetermined resistance value. Then, the resistor 15 is formed by patterning by photolithography. At that time, although not shown, a silicon oxide film may be formed on the surface of the resistor 15 by thermal oxidation. Note that the constituent material of the resistor 15 is not limited to polycrystalline silicon, but other than that, single crystal silicon into which impurities are introduced, gold, platinum, or the like, which is a metal material, may be formed as a constituent material. it can.

抵抗体15の形成後、抵抗体15を含む酸化シリコン膜14上に、CVD法により層間絶縁膜16であるBPSG膜を形成し、例えば900〜1000℃の温度にて熱処理する。このように、層間絶縁膜16であるBPSG膜を高温で熱処理すると、抵抗体15端部の段差部分においてなだらかな形状となり、段差形状を緩和することができる。従って、配線部17のカバレッジ不足の問題を解消することができる。熱処理後、層間絶縁膜16をフォトリソグラフィー処理し、薄膜部20の形成領域内において、抵抗体15と配線部17とが積層方向において重なる位置に、接続部15a用のコンタクトホールを形成する。尚、層間接続膜16は、BPSG膜に限定されるものではなく、それ以外にも窒化シリコン膜や酸化シリコン膜であっても良いし、酸化シリコン膜と窒化シリコン膜の複合膜であっても良い。   After the formation of the resistor 15, a BPSG film as the interlayer insulating film 16 is formed on the silicon oxide film 14 including the resistor 15 by a CVD method, and heat treatment is performed at a temperature of 900 to 1000 ° C., for example. As described above, when the BPSG film as the interlayer insulating film 16 is heat-treated at a high temperature, the stepped portion at the end of the resistor 15 has a gentle shape, and the stepped shape can be relaxed. Therefore, the problem of insufficient coverage of the wiring part 17 can be solved. After the heat treatment, the interlayer insulating film 16 is subjected to a photolithography process, and a contact hole for the connection portion 15a is formed in the formation region of the thin film portion 20 at a position where the resistor 15 and the wiring portion 17 overlap in the stacking direction. The interlayer connection film 16 is not limited to the BPSG film, but may be a silicon nitride film or a silicon oxide film, or a composite film of a silicon oxide film and a silicon nitride film. good.

そして、上記コンタクトホール内及び層間絶縁膜16上に、低抵抗金属材料であるアルミニウムを成膜し、フォトリソグラフィー処理によりパターニングする。これにより、抵抗体15と接続部15aにて電気的に接続される配線部17が形成される。尚、配線部17の形成とともに、配線部17の端部に電極としてのパッド部17aが形成される。また、配線部17を構成する材料はアルミニウム以外にも、金や銅等の低抵抗金属を用いることができる。   Then, aluminum, which is a low-resistance metal material, is formed in the contact hole and on the interlayer insulating film 16 and patterned by photolithography. Thereby, the wiring part 17 electrically connected by the resistor 15 by the connection part 15a is formed. Along with the formation of the wiring portion 17, a pad portion 17 a as an electrode is formed at the end of the wiring portion 17. Moreover, the material which comprises the wiring part 17 can use low resistance metals, such as gold | metal | money and copper, besides aluminum.

次いで、窒化シリコンからなる保護膜18を例えばCVD法により形成し、フォトリソグラフィー処理によりパターニングしてパッド部17a用の開口部を形成する。これにより、配線部17の端部に設けたパッド部17aが保護膜18から露出される。   Next, a protective film 18 made of silicon nitride is formed by, for example, a CVD method, and patterned by a photolithography process to form an opening for the pad portion 17a. As a result, the pad portion 17 a provided at the end portion of the wiring portion 17 is exposed from the protective film 18.

保護膜18の形成後、保護膜18上の薄膜部20の形成領域内に、カーボンブラックを構成材料とするペーストを用いて、スクリーン印刷により所定形状の高放射性膜30を形成する。その際、高放射性膜30は、抵抗体15の形成領域を覆うように、当該抵抗体15の形成領域よりも広く、且つ、薄膜部20の形成領域端に対して所定の間隙を有するように設けられる。尚、高放射性膜30の形成方法は、スクリーン印刷に限定されるものではない。高放射性膜30を構成する材料に適した種々の方法を用いることができる。例えば、インクジェット印刷により高放射性膜30を形成しても良いし、カーボンブラックや金属材料(金、白金、クロム等)の場合には、スパッタリングや蒸着により高放射性膜30を形成しても良い。また、炭化珪素の場合には、CVD法により成膜し、フォトリソグラフィー処理によりパターニングして高放射性膜30を形成することもできる。   After the formation of the protective film 18, a highly radioactive film 30 having a predetermined shape is formed by screen printing using a paste containing carbon black as a constituent material in the formation region of the thin film portion 20 on the protective film 18. At this time, the highly radioactive film 30 is wider than the region where the resistor 15 is formed so as to cover the region where the resistor 15 is formed, and has a predetermined gap with respect to the end of the region where the thin film portion 20 is formed. Provided. Note that the method for forming the highly radioactive film 30 is not limited to screen printing. Various methods suitable for the material constituting the highly radioactive film 30 can be used. For example, the highly radioactive film 30 may be formed by ink jet printing, or in the case of carbon black or a metal material (gold, platinum, chromium, etc.), the highly radioactive film 30 may be formed by sputtering or vapor deposition. In the case of silicon carbide, the highly radioactive film 30 can also be formed by forming a film by a CVD method and patterning by a photolithography process.

最後に、基板10の下面全面に、例えばプラズマCVD法によりエッチングマスク用の窒化シリコン膜12を形成する。そして、フォトリソグラフィー処理により窒化シリコン膜12に薄膜部20を形成する領域に応じた開口部位を形成し、シリコンからなる基板10を、例えば水酸化カリウム水溶液を用いて異方性エッチング処理によりエッチングする。このエッチングでは、基板10の上面に設けられた絶縁膜13が露出するまで基板10のエッチングがなされ、基板10の上面に薄膜部20の形成領域に対応した上面開口部11aを有する開口部11が形成される。   Finally, a silicon nitride film 12 for an etching mask is formed on the entire lower surface of the substrate 10 by plasma CVD, for example. Then, an opening portion corresponding to a region where the thin film portion 20 is formed is formed in the silicon nitride film 12 by photolithography, and the silicon substrate 10 is etched by anisotropic etching using, for example, a potassium hydroxide aqueous solution. . In this etching, the substrate 10 is etched until the insulating film 13 provided on the upper surface of the substrate 10 is exposed, and an opening 11 having an upper surface opening 11 a corresponding to the formation region of the thin film portion 20 is formed on the upper surface of the substrate 10. It is formed.

以上の工程を経て、基板10に対して上面開口部11a上に浮いた状態の薄膜部20を有する赤外線光源100が形成される。   Through the above steps, the infrared light source 100 having the thin film portion 20 in a state of being floated on the upper surface opening 11a with respect to the substrate 10 is formed.

上記の製造方法は、一般的な半導体装置の製造技術を用いるものであり、特別な製造工程を必要としない。従って、図1(a),(b)に示す赤外線光源100を、安価に製造することができる。   The above manufacturing method uses a general semiconductor device manufacturing technique and does not require a special manufacturing process. Accordingly, the infrared light source 100 shown in FIGS. 1A and 1B can be manufactured at low cost.

尚、高放射性膜30の形成は、保護膜18の形成後ではなく、開口部11の形成後に実行されても良い。   The formation of the highly radioactive film 30 may be performed after the opening 11 is formed, not after the protective film 18 is formed.

また、上記製造工程において、酸化シリコン膜14等、吸湿性を有する膜を形成する際には、吸湿による膜応力の変動を防ぐため、膜形成後に必要に応じて加熱処理しても良い。   In the manufacturing process, when a hygroscopic film such as the silicon oxide film 14 is formed, heat treatment may be performed as necessary after the film is formed in order to prevent fluctuations in film stress due to moisture absorption.

以上本発明の好ましい実施形態について説明したが、本発明は上述の実施形態のみに限定されず、種々変更して実施する事ができる。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made.

本実施形態において、赤外線光源100は、基板10の薄膜部20の形成領域に対応する部位に、基板10の上面及び下面に開口する開口部11を有する例を示した。しかしながら、赤外線光源100は、図3に示すように、基板10の薄膜部20下部に、基板10の上面のみに開口する開口部11を有する構造であっても良い。この場合、先ずフォトリソグラフィー処理により、絶縁膜13、酸化シリコン膜14、層間絶縁膜16、及び保護膜18に、エッチング用の開口部を形成する。そして、保護膜18をエッチングマスクとして、開口部より薄膜部20下部に位置する基板10を選択エッチングすることにより、基板上面側のみに開口する開口部11を形成することができる。しかしながら、この場合、薄膜部20の形成領域内にエッチング用の開口部を形成するため、基板10の下面から選択エッチングして開口部11を形成する場合よりも、高放射性膜30の形状及び面積(平面方向)に制約が生じる。   In this embodiment, the infrared light source 100 has shown the example which has the opening part 11 opened to the upper surface and lower surface of the board | substrate 10 in the site | part corresponding to the formation area of the thin film part 20 of the board | substrate 10. FIG. However, as shown in FIG. 3, the infrared light source 100 may have a structure having an opening 11 that opens only on the upper surface of the substrate 10 below the thin film portion 20 of the substrate 10. In this case, first, etching openings are formed in the insulating film 13, the silicon oxide film 14, the interlayer insulating film 16, and the protective film 18 by photolithography. Then, by using the protective film 18 as an etching mask and selectively etching the substrate 10 positioned below the thin film portion 20 from the opening, the opening 11 opened only on the upper surface side of the substrate can be formed. However, in this case, since the opening for etching is formed in the formation region of the thin film portion 20, the shape and area of the highly radioactive film 30 are larger than when the opening 11 is formed by selective etching from the lower surface of the substrate 10. Restrictions occur in the (plane direction).

また、本実施形態において、赤外線光源100を構成する基板10として、シリコンからなる半導体基板を用いる例を示した。しかしながら、基板10は半導体基板に限定されるものではない。それ以外にも、基板10として例えばガラス基板等を適用することもできる。   Moreover, in this embodiment, the example which uses the semiconductor substrate which consists of silicon | silicone was shown as the board | substrate 10 which comprises the infrared light source 100. However, the substrate 10 is not limited to a semiconductor substrate. Besides, for example, a glass substrate or the like can be applied as the substrate 10.

また、本実施形態において、赤外線光源100を構成する高放射性膜30が、良好な熱伝導性を有する例を示した。しかしながら、高放射性膜30は必ずしも良好な熱伝導性を有さなくても良い。例えば高放射性膜30が、薄膜部20表面における抵抗体15の形成領域内のみに設けられる場合、良好な熱伝導性を有さなくとも高放射性膜30の温度はその全面においてほぼ同等となる。しかしながら、高放射性膜30が良好な熱伝導性を有すると、抵抗体15から発せられ、抵抗体15周囲にある薄膜部20の構成要素(層間絶縁膜16等)に伝達された熱を、高放射性膜30内に効率良く取り込むことができる。従って、基板10及び基板10の開口部11側に逃げる熱量がさらに減少するので、赤外線光源100の赤外線放射効率をさらに向上することができる。   Moreover, in this embodiment, the example in which the high emissivity film | membrane 30 which comprises the infrared light source 100 has favorable thermal conductivity was shown. However, the highly radioactive film 30 does not necessarily have good thermal conductivity. For example, when the highly radioactive film 30 is provided only in the region where the resistor 15 is formed on the surface of the thin film portion 20, the temperature of the highly radioactive film 30 is almost the same over the entire surface without having good thermal conductivity. However, if the highly radioactive film 30 has good thermal conductivity, the heat generated from the resistor 15 and transferred to the constituent elements (such as the interlayer insulating film 16) of the thin film portion 20 around the resistor 15 is increased. It can be taken into the radioactive film 30 efficiently. Therefore, since the amount of heat escaping to the substrate 10 and the opening 11 side of the substrate 10 is further reduced, the infrared radiation efficiency of the infrared light source 100 can be further improved.

また、本実施形態において、高放射性膜30は、層間絶縁膜16及び保護膜18を介して抵抗体15上に設けられる例を示した。しかしながら、高放射性膜30は抵抗体15に対して電気的な絶縁状態を確保さえできれば、上記例に限定されるものではない。例えば無機材料である炭化珪素を材料として高放射性膜30が形成される場合には、抵抗体15に接するように設けることも可能である。   In the present embodiment, an example in which the high radioactive film 30 is provided on the resistor 15 via the interlayer insulating film 16 and the protective film 18 is shown. However, the high emissivity film 30 is not limited to the above example as long as an electrical insulation state with respect to the resistor 15 can be secured. For example, when the highly radioactive film 30 is formed using silicon carbide, which is an inorganic material, it can be provided so as to be in contact with the resistor 15.

また、本実施形態において、高放射性膜30は、薄膜部20の基板10に対する面の裏面(保護膜18上)に設けられる例を示した。しかしながら、薄膜部20の基板10に対峙する面に高放射性膜30が設けられる構成であっても良い。しかしながら、この場合、高放射性膜30から放射された赤外線の一部が基板10に吸収されてしまう。従って、高放射性膜30は、本実施形態に示すように、薄膜部20の基板10に対する面の裏面に設けられることが好ましい。   Moreover, in this embodiment, the example in which the highly radioactive film | membrane 30 is provided in the back surface (on the protective film 18) with respect to the board | substrate 10 of the thin film part 20 was shown. However, the high radioactive film 30 may be provided on the surface of the thin film portion 20 that faces the substrate 10. However, in this case, a part of infrared rays emitted from the high emissivity film 30 is absorbed by the substrate 10. Therefore, as shown in the present embodiment, the highly radioactive film 30 is preferably provided on the back surface of the surface of the thin film portion 20 with respect to the substrate 10.

本発明の第1の実施における赤外線光源の概略構成を示す図であり、(a)は平面図、(b)は(a)のA−A断面における断面図である。It is a figure which shows schematic structure of the infrared light source in the 1st implementation of this invention, (a) is a top view, (b) is sectional drawing in the AA cross section of (a). 赤外線光源を赤外線検知式ガスセンサに適用した際の概略構成図であり、(a)は赤外線光源と赤外線検出素子が対向配置される直線型、(b)は赤外線光源と赤外線検出素子が並んで配置される反射型を示す図である。It is a schematic block diagram at the time of applying an infrared light source to an infrared detection type gas sensor. It is a figure which shows the reflection type. 変形例を示す断面図である。It is sectional drawing which shows a modification.

符号の説明Explanation of symbols

10・・・基板
11・・・開口部
11a・・・上面開口部
15・・・抵抗体
20・・・薄膜部(メンブレン)
30・・・高放射性膜
100・・・赤外線光源
200・・・赤外線検出素子
300・・・赤外線検知式ガスセンサ(ガスセンサ)
DESCRIPTION OF SYMBOLS 10 ... Board | substrate 11 ... Opening part 11a ... Upper surface opening part 15 ... Resistor 20 ... Thin film part (membrane)
30 ... Highly radioactive film 100 ... Infrared light source 200 ... Infrared detector 300 ... Infrared detection type gas sensor (gas sensor)

Claims (9)

基板に設けられたメンブレンとしての薄膜部と、
前記薄膜部に設けられ、通電により発熱する抵抗体と、
前記薄膜部上に設けられ、前記抵抗体の赤外線放射率以上の赤外線放射率を有し、前記抵抗体からの熱を受けて赤外線を発光する高放射性膜とを備え、
前記抵抗体及び前記高放射性膜が、前記薄膜部の形成領域内のみに設けられ、
前記高放射性膜は、前記薄膜部の形成領域端に対して所定の間隙をもって設けられると共に、少なくとも前記抵抗体の形成領域上に設けられていることを特徴とする赤外線光源。
A thin film portion as a membrane provided on the substrate;
A resistor provided in the thin film portion and generating heat when energized;
Provided on the thin film portion, having an infrared emissivity equal to or higher than the infrared emissivity of the resistor, and comprising a high emissivity film that emits infrared rays by receiving heat from the resistor,
The resistor and the highly radioactive film are provided only in the formation region of the thin film portion,
The infrared light source, wherein the high-radiation film is provided with a predetermined gap with respect to an end of the thin film portion forming region and at least on the resistor forming region .
前記高放射性膜は、前記抵抗体形成領域を覆いつつ、前記抵抗体形成領域よりも広い領域に設けられていることを特徴とする請求項1に記載の赤外線光源。 2. The infrared light source according to claim 1, wherein the high-radiation film is provided in a region wider than the resistor formation region while covering the resistor formation region . 前記基板上に、電極としてのパッド部を有する配線部がさらに設けられ、当該配線部が前記薄膜部まで伸延し、前記抵抗体と電気的に接続されていることを特徴とする請求項1又は2に記載の赤外線光源。 On the substrate, the wiring portion is further provided with a pad portion of an electrode, according to claim 1 in which the wiring portion and said thin film portion to distract is a resistor electrically connected or infrared light source according to. 前記高放射性膜は、カーボンブラック、金、白金、クロム、及び炭化珪素の少なくともいずれかを材料として形成されたことを特徴とする請求項1〜3のいずれか1項に記載の赤外線光源。 The infrared light source according to any one of claims 1 to 3, wherein the highly radioactive film is formed using at least one of carbon black, gold, platinum, chromium, and silicon carbide . 前記基板は、前記薄膜部形成面側のみに開口していることを特徴とする請求項1〜4いずれか1項に記載の赤外線光源。 The infrared light source according to claim 1 , wherein the substrate is opened only on the thin film portion forming surface side . 前記基板は、前記薄膜部形成面の裏面側にも開口していることを特徴とする請求項5に記載の赤外線光源。 The substrate includes an infrared light source according to claim 5, characterized in Rukoto yet open to the rear surface side of the thin portion forming plane. 前記高放射性膜は、前記基板の開口部位に対峙する前記薄膜部表面の裏面に設けられていることを特徴とする請求項5又は請求項6に記載の赤外線光源。 The infrared light source according to claim 5, wherein the highly radioactive film is provided on a back surface of the surface of the thin film portion facing an opening portion of the substrate . 前記基板は、半導体基板であることを特徴とする請求項1〜7いずれか1項に記載の赤外線光源。 The substrate includes an infrared light source according to any one of claims 1 to 7, wherein the semiconductor substrate der Rukoto. 前記赤外線光源は、特定波長の赤外線吸収量により被測定ガスの種類および濃度を測定する、赤外線検知式ガスセンサの光源として用いられることを特徴とする請求項1〜いずれか1項に記載の赤外線光源。 The infrared light source, measures the type and concentration of the gas to be measured by the infrared absorption of a specific wavelength, according to any one of claims 1-8, characterized in Rukoto used as an infrared detection type gas sensor of the light source Infrared light source.
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