JPH048639Y2 - - Google Patents
Info
- Publication number
- JPH048639Y2 JPH048639Y2 JP1987195583U JP19558387U JPH048639Y2 JP H048639 Y2 JPH048639 Y2 JP H048639Y2 JP 1987195583 U JP1987195583 U JP 1987195583U JP 19558387 U JP19558387 U JP 19558387U JP H048639 Y2 JPH048639 Y2 JP H048639Y2
- Authority
- JP
- Japan
- Prior art keywords
- air
- ceramic layer
- electric heater
- heater
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002184 metal Substances 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 26
- 239000000919 ceramic Substances 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 description 11
- 239000000853 adhesive Substances 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000006071 cream Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 238000005323 electroforming Methods 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、はんだのリフロー、樹脂のキユア
ー、さらには食品の乾燥、木材、塗装面の加熱、
あるいは医療用の加熱等の処理に使用される赤外
線ヒータ、特に、波長領域が４〜25μmの遠赤外
線を放射する赤外線ヒータに関する。[Detailed description of the invention] (Industrial application field) This invention is useful for solder reflow, resin curing, food drying, heating of wood and painted surfaces,
The present invention also relates to an infrared heater used for medical heating and other treatments, particularly an infrared heater that emits far infrared rays in a wavelength range of 4 to 25 μm.
（従来の技術）
近時の電子機器では軽量・小型化の傾向から小
さな面積に多数の電子部品を搭載したプリント基
板（以下「高密度実装基板」という）が用いられ
るようになつてきた。従つて高密度実装基板にお
いて電子部品をクリームはんだで接合したり、或
いはこれらを接着材で接合する時には、クリーム
はんだを溶解させ、また接着材を硬化させるため
の熱を電子部品の間隙に十分に侵入させなければ
ならない。このときの加熱装置としてはトンネル
内の上下に赤外線ヒータを設置したリフロー炉が
用いられる。リフロー炉の赤外線ヒータはシース
ヒータだけを設置したり、或いは鉄板にヒータを
取付けたもので、その放射波長は3μm以下のもの
であつた。(Prior Art) In recent years, electronic devices have come to use printed circuit boards (hereinafter referred to as "high-density mounting boards") on which a large number of electronic components are mounted on a small area due to the trend towards lighter weight and smaller size. Therefore, when bonding electronic components with cream solder or adhesive on a high-density mounting board, it is necessary to provide enough heat to melt the cream solder and harden the adhesive into the gaps between the electronic components. must be penetrated. As a heating device at this time, a reflow oven with infrared heaters installed above and below inside the tunnel is used. Infrared heaters in reflow ovens have been installed with only a sheathed heater or with a heater attached to an iron plate, and the radiation wavelength has been 3 μm or less.
（考案が解決しようとする問題点）
ところで赤外線は直進するため、高密度実装基
板では電子部品が邪魔となつて、クリームはんだ
や接着剤が塗布された箇所にまで十分に赤外線が
到達しないことがあつた。それ故、クリームはん
だでのはんだ付けは、はんだ付け不良を起こした
り、また接着剤での接合では接着剤が完全に硬化
せず剥離してしまうということがあつた。(Problem that the invention aims to solve) By the way, infrared rays travel in a straight line, so on high-density mounting boards, electronic components may get in the way and the infrared rays may not fully reach the areas where cream solder or adhesive is applied. It was hot. Therefore, soldering using cream solder may result in poor soldering, and joining using adhesive may result in the adhesive not being completely cured and peeling off.
また、従来の赤外線ヒータは波長領域が3μm以
下であるが、該波長域の赤外線は白色のものへの
吸収、特にはんだのような金属への吸収があまり
良くなく、従つてリフロー炉でクリームはんだを
完全に溶解させるためには、シースヒータへの電
流を多く流して発熱量を多くしなければならなか
つた。しかるに3μm以下のは波長の赤外線は黒色
のものによく吸収されるため、黒色をした電子部
品ばかりが加熱されることになる。しかも、クリ
ームはんだや接着剤への加熱を目的として温度を
上げると電子部品はさらに加熱され、ついには熱
損傷により機能劣化を起こしたり、全く使用不可
能な状態になつてしまうものがあつた。 In addition, conventional infrared heaters have a wavelength range of 3 μm or less, but infrared rays in this wavelength range are not well absorbed by white objects, especially metals such as solder. In order to completely melt the liquid, it was necessary to increase the amount of heat generated by passing a large amount of current to the sheath heater. However, infrared rays with a wavelength of 3 μm or less are well absorbed by black objects, so only black electronic components are heated. Moreover, when the temperature is raised to heat the cream solder or adhesive, the electronic components are heated even more, and some of them end up suffering functional deterioration due to heat damage, or become completely unusable.
よつて、本考案の目的は、高密度実装基板にお
いて搭載部品の間隙をも十分に加熱するばかりで
なく、クリームはんだや接着剤への熱吸収のよい
赤外線を放射する赤外線ヒータを提供することに
ある。 Therefore, the purpose of the present invention is to provide an infrared heater that not only sufficiently heats the gaps between mounted components on a high-density mounting board, but also emits infrared rays that have good heat absorption into cream solder and adhesive. be.
（問題点を解決するための手段）
上記目的を達成すべく、本考案者が種々検討を
重ねたところ、赤外線ヒータの熱源自体を熱源と
した熱風を吹き出させること、赤外線照射源とし
てセラミツクス層を用いることにより効率的に加
熱が可能となること、および通気性セラミツクス
層を利用することにより両者を機能的に結合で
き、その相乗的作用効果が効果的に発揮されるこ
とを知り、本考案を完成した。(Means for Solving the Problems) In order to achieve the above object, the inventor of the present invention has conducted various studies and found that the heat source of the infrared heater itself is used as a heat source to blow out hot air, and that a ceramic layer is used as the infrared irradiation source. We discovered that by using a breathable ceramic layer, it is possible to heat efficiently, and that by using a breathable ceramic layer, the two can be functionally combined, and their synergistic effect can be effectively demonstrated. completed.
本考案の要旨とするところは、空胴体内に電熱
ヒータを設置するとともに、加熱されて赤外線を
放射する通気性セラミツクス層を備えた三次元網
状金属体または多孔質金属焼結体から成る通気性
加熱面を前記電熱ヒータ上に設置し、さらに前記
空胴内であつて前記電熱ヒータの背後に送風装置
を設け前記通気性加熱面を経て加熱気体を吹き出
させるべく構成したことを特徴とする赤外線ヒー
タである。 The gist of the present invention is to install an electric heater inside the air body, and to create a breathable body made of a three-dimensional mesh metal body or porous metal sintered body equipped with a breathable ceramic layer that emits infrared rays when heated. A heating surface is installed on the electric heater, and an air blower is provided in the cavity behind the electric heater to blow out heated gas through the air-permeable heating surface. It's a heater.
本考案において使用する加熱により赤外線を放
射するセラミツクスとしては、Ａ203、Ti02、
Cr203、Mg0、Zr02、Si02等であり、これらは例
えば電鋳により製造される三次元網状構造を有す
る多孔質金属板、つまり三次元網状金属体（商品
名”セルメツト”（住友電工製）または通気性を
有する多孔質焼結金属支持体に焼付けたり、溶射
することにより設置される。 Ceramics that emit infrared rays when heated to be used in the present invention include A 2 0 3 , Ti0 2 ,
Cr 2 0 3 , Mg 0 , Zr 0 2 , Si0 2 , etc., and these are, for example, porous metal plates with a three-dimensional network structure manufactured by electroforming, that is, three-dimensional network metal bodies (product name "Celmet" (Sumitomo Co., Ltd.)). (manufactured by Electric Works) or by baking or thermal spraying onto a porous sintered metal support with air permeability.
本考案において使用する送風装置は、代表的に
は回転フアンであつて、回転翼によつて強制的に
送風を行う形式のものであれば、具体的構造は特
に制限されない。空洞体内にあつて電熱ヒータの
背後に設置することから、可及的に小形かつ強力
な送風装置が好ましい。 The blowing device used in the present invention is typically a rotating fan, and its specific structure is not particularly limited as long as it is of a type that forcibly blows air using rotary blades. Since it is installed inside the hollow body and behind the electric heater, it is preferable to use a blower device that is as small and powerful as possible.
かくして、本考案によれば、セラミツクス層の
支持体として金属支持体を使用していることか
ら、セラミツクス単独の場合と比較して強度的に
もはるかに優れ、しかも金属体の熱伝導がよいこ
とからセラミツクス層が設けられた加熱面の隅々
まで均一に加熱され、したがつて遠赤外線放射率
が全体的に均一化され全体の放射効率も改善され
る。 Thus, according to the present invention, since a metal support is used as a support for the ceramic layer, the strength is far superior to that of ceramics alone, and the metal body has good thermal conductivity. The ceramic layer is heated uniformly to every corner of the heating surface provided with the ceramic layer, thereby making the far-infrared emissivity uniform throughout and improving the overall radiation efficiency.
また、本考案によれば、通気性加熱面を構成す
るのは、多孔質金属焼結体または三次元網状金属
体であつて、いわゆるパンチ孔板と比較して、セ
ラミツクス層の加熱が金属伝導によるばかりでな
く気体の対流による直接的加熱が行われるためか
なり改善される。 Furthermore, according to the present invention, the air-permeable heating surface is composed of a porous metal sintered body or a three-dimensional mesh metal body, and compared to a so-called punched hole plate, heating of the ceramic layer is performed by metal conduction. This is a considerable improvement because direct heating is performed not only by gas convection but also by gas convection.
このように本考案によれば、空胴体内および通
気性加熱面を通過する時に加熱された気体は上記
通気性加熱面を通つて被加熱体に吹き付けられ、
赤外線が到達しないような狭い間隙でも容易に侵
入し、また通気性加熱面を構成する加熱されたセ
ラミツクス層からは金属や白色物への吸収の良好
な４〜25μmの赤外線が放射される。このように
熱風と赤外線を共用することによりその相乗作用
で高密度実装基板に対しクリームはんだや接着剤
の熱処理をさらに効率的に行うことができる。 As described above, according to the present invention, the gas heated while passing through the air body and the air permeable heating surface is blown onto the object to be heated through the air air heating surface,
Infrared rays can easily penetrate into narrow gaps where infrared rays cannot reach, and the heated ceramic layer that makes up the air-permeable heating surface emits infrared rays with a wavelength of 4 to 25 μm, which is well absorbed by metals and white objects. By using hot air and infrared rays in common in this way, the synergistic effect of the hot air and infrared rays makes it possible to more efficiently heat-treat cream solder and adhesive on high-density mounting boards.
（実施例）
本考案にかかる赤外線ヒータは、添付図面にも
示すように、箱状空胴体１、電熱ヒータ２、通気
性セラミツクス層３および送風装置８から構成さ
れている。(Example) The infrared heater according to the present invention is composed of a box-shaped hollow body 1, an electric heater 2, a breathable ceramic layer 3, and a blower device 8, as shown in the accompanying drawings.
第１図は本考案の１実施例を一部破壊して示す
斜視図および第２図は第１図のＡ−Ａ線に沿つた
断面図である。 FIG. 1 is a partially exploded perspective view of one embodiment of the present invention, and FIG. 2 is a sectional view taken along line A--A in FIG. 1.
箱状空胴体１内にはシースの電熱ヒータ２が蛇
行状態で水平に設置されている。該電熱ヒータの
上には通気性のある金属支持体５を介して通気性
セラミツクス層３が設置されている。通気性のあ
る金属支持体とは、金属粉を粗状に焼結した多孔
質焼結金属板、或いは金属を電解液で電鋳した三
次元金属網状体（商品名：セルメツト）であり、
セラミツクス層３の支持体としての機能、要求さ
れる通気性等を考慮すれば、電鋳により得られる
三次元金属網状体が好ましいものである。 Inside the box-shaped hollow body 1, a sheathed electric heater 2 is installed horizontally in a meandering manner. A breathable ceramic layer 3 is placed on the electric heater with a breathable metal support 5 interposed therebetween. The breathable metal support is a porous sintered metal plate made by coarsely sintering metal powder, or a three-dimensional metal network (product name: Celmet) made by electroforming metal with an electrolyte.
Considering the function of the ceramic layer 3 as a support, the required air permeability, etc., a three-dimensional metal network obtained by electroforming is preferable.
また通気性セラミツクス層は後述する送風装置
から送風される気体を容易に通過させるもので、
通気性金属支持体上に設置する場合はセラミツク
ス質を焼付けたり、溶射することにより通気状態
にすることができる。 In addition, the breathable ceramic layer allows gas blown from the blower, which will be described later, to pass through easily.
When installed on an air-permeable metal support, the air-permeable state can be achieved by baking or spraying ceramic material.
箱状空洞体１にあつて電熱ヒータ２の背後には
送風装置８が設けられている。図示例では回転翼
９を備えたフアンである。駆動軸１０は電動機１
１に接続されている。この送風装置８の取付けは
適宜行うことができる。 A blower device 8 is provided behind the electric heater 2 in the box-shaped hollow body 1. In the illustrated example, it is a fan equipped with rotary blades 9. The drive shaft 10 is an electric motor 1
Connected to 1. This blower device 8 can be attached as appropriate.
本考案にかかる赤外線ヒータはリフロー炉のト
ンネル内に上下に設置して使用するのに特に適し
ているが、それにのみ制限されるものではない。 The infrared heater according to the present invention is particularly suitable for use by being installed vertically in the tunnel of a reflow oven, but is not limited thereto.
次に、本考案の赤外線ヒータの使用状態につい
て図面にもとずいて説明する。 Next, the usage state of the infrared heater of the present invention will be explained based on the drawings.
先ず電熱ヒータ２に通電を行う。電熱ヒータ２
が加熱されると、その上に置かれた通気性加熱面
を構成する金属支持体５およびセラミツクス層３
が加熱され、さらには電熱ヒータ２の置かれた箱
状空胴体１内も加熱されることになる。斯様に全
てが十分加熱されたならば、電熱ヒータ２の背後
に設けられた、図示例では回転フアンである送風
装置を起動させて背後から強制的に送風する。必
要により、箱状空洞体１を気密に構成するととも
に気体流入口を設け、そこから気体（空気または
N2、CO2、Ar，He等の不活性ガス）を箱状空胴
体１内に導入するように構成してもよい。かかる
送風手段によつて気体は熱い箱状空胴体１内で加
熱され、さらに熱い通気性金属支持体５、セラミ
ツクス層３を通過する時に加熱されて熱風となつ
て出てくる。つまり、本考案の赤外線ヒータでは
加熱されたセラミツクスから波長４〜25μmの遠
赤外線が放射されるとともにセラミツクス層の通
気孔からは熱風が吹出してくるものである。 First, the electric heater 2 is energized. electric heater 2
is heated, the metal support 5 and the ceramic layer 3 which constitute the air-permeable heating surface placed thereon
is heated, and furthermore, the inside of the box-shaped hollow body 1 in which the electric heater 2 is placed is also heated. Once everything has been sufficiently heated in this way, a blower device, which is a rotating fan in the illustrated example, which is provided behind the electric heater 2, is activated to forcibly blow air from behind. If necessary, the box-shaped hollow body 1 is made airtight and a gas inlet is provided, through which gas (air or
An inert gas such as N 2 , CO 2 , Ar, He, etc.) may be introduced into the box-shaped hollow body 1 . The gas is heated in the hot box-shaped hollow body 1 by the blowing means, and when it passes through the hot air-permeable metal support 5 and the ceramic layer 3, it is heated and comes out as hot air. That is, in the infrared heater of the present invention, far infrared rays with a wavelength of 4 to 25 μm are emitted from the heated ceramics, and hot air is blown out from the vents in the ceramic layer.
（考案の効果）
本考案にかかる赤外線ヒータをリフロー炉に設
置してクリームはんだや接着剤を塗布した高密度
実装基板の加熱を行つた場合、セラミツクス層か
らは金属や樹脂によく吸収される４〜25μmの遠
赤外線が放射されるため、クリームはんだや接着
剤が効率よく加熱され、またセラミツクス層の通
気孔から吹き出る熱風は高密度実装基板の各部分
間に侵入して赤外線が届きにくい箇所を加熱す
る。従つて、本考案の赤外線ヒータは遠赤外線と
熱風の長所を十分に発揮するとともに、この相乗
作用でクリームはんだ付けや接着剤での接合を完
全なものにするという優れた効果を有している。(Effect of the invention) When the infrared heater according to the invention is installed in a reflow oven and heats a high-density mounting board coated with cream solder or adhesive, the ceramic layer is well absorbed by metals and resins. Far-infrared rays of ~25μm are emitted, which efficiently heats cream solder and adhesives, and the hot air blown out from the vents in the ceramic layer penetrates between each part of the high-density mounting board, reaching areas that are difficult for infrared rays to reach. Heat. Therefore, the infrared heater of the present invention fully demonstrates the advantages of far infrared rays and hot air, and has the excellent effect of perfecting cream soldering and adhesive bonding through this synergistic effect. .
なお、以上の説明はリフロー炉に本考案にかか
る赤外線ヒータを使用した例にもとずいている
が、すでに述べたように本考案は加熱処理一般に
適用可能であることは、理解されよう。 Although the above explanation is based on an example in which the infrared heater according to the present invention is used in a reflow oven, it will be understood that the present invention is applicable to heat processing in general, as already stated.
第１図は、本考案の実施例の一部破壊斜視図；
および第２図は、第１図のＡ−Ａ線に沿つた断面
図である。
１……箱状空胴体、２……電熱ヒータ、３……
通気性セラミツクス層、８……送風装置、５……
通気性金属支持体。
FIG. 1 is a partially exploded perspective view of an embodiment of the present invention;
and FIG. 2 is a sectional view taken along line A-A in FIG. 1. 1... Box-shaped empty body, 2... Electric heater, 3...
Breathable ceramic layer, 8...Blower device, 5...
Breathable metal support.
Claims (1)
加熱されて赤外線を放射する通気性セラミツク
ス層を備えた三次元網状金属体または多孔質金
属焼結体から成る通気性加熱面を前記電熱ヒー
タ上に設置し、さらに前記空胴内であつて前記
電熱ヒータの背後に送風装置を設け前記通気性
加熱面を経て加熱気体を吹き出させるべく構成
したことを特徴とする赤外線ヒータ。 (2) 前記送風手段が回転フアンである、実用新案
登録請求の範囲第１項に記載の赤外線ヒータ。[Scope of claim for utility model registration] (1) In addition to installing an electric heater in the air fuselage,
A gas permeable heating surface made of a three-dimensional mesh metal body or a porous metal sintered body having a gas permeable ceramic layer that emits infrared rays when heated is installed on the electric heater; An infrared heater characterized in that an air blower is provided behind the electric heater to blow out heated gas through the air-permeable heating surface. (2) The infrared heater according to claim 1, wherein the blowing means is a rotating fan.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987195583U JPH048639Y2 (en) | 1987-12-23 | 1987-12-23 | |
| DE3804704A DE3804704A1 (en) | 1987-02-17 | 1988-02-15 | INFRARED HEATING DEVICE |
| GB8803597A GB2201320B (en) | 1987-02-17 | 1988-02-17 | Infrared heater |
| US07/352,227 US5058196A (en) | 1987-02-17 | 1989-05-15 | Electric infrared heater having a gas permeable electroformed porous metallic panel coated with a porous ceramic far-infrared radiating layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987195583U JPH048639Y2 (en) | 1987-12-23 | 1987-12-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0198494U JPH0198494U (en) | 1989-06-30 |
| JPH048639Y2 true JPH048639Y2 (en) | 1992-03-04 |
Family
ID=31486256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987195583U Expired JPH048639Y2 (en) | 1987-02-17 | 1987-12-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH048639Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0726050Y2 (en) * | 1990-11-27 | 1995-06-14 | 株式会社今井製作所 | Automatic soldering machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026192B2 (en) * | 1977-10-03 | 1985-06-22 | セイコーエプソン株式会社 | Electronic circuit for watches |
| JPS60198079A (en) * | 1983-12-12 | 1985-10-07 | アシノフ | Electric infrared ray generator |
| JPS6232962B2 (en) * | 1982-06-18 | 1987-07-17 | Donaldson Co Inc |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026192U (en) * | 1983-07-28 | 1985-02-22 | 日本碍子株式会社 | Plate infrared heater |
| JPH035821Y2 (en) * | 1985-08-15 | 1991-02-14 | ||
| JPH0315928Y2 (en) * | 1986-03-14 | 1991-04-05 |
-
1987
- 1987-12-23 JP JP1987195583U patent/JPH048639Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6026192B2 (en) * | 1977-10-03 | 1985-06-22 | セイコーエプソン株式会社 | Electronic circuit for watches |
| JPS6232962B2 (en) * | 1982-06-18 | 1987-07-17 | Donaldson Co Inc | |
| JPS60198079A (en) * | 1983-12-12 | 1985-10-07 | アシノフ | Electric infrared ray generator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0198494U (en) | 1989-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0625919Y2 (en) | Infrared heater | |
| US5058196A (en) | Electric infrared heater having a gas permeable electroformed porous metallic panel coated with a porous ceramic far-infrared radiating layer | |
| JP2003338360A5 (en) | ||
| JPH048639Y2 (en) | ||
| CN101648304A (en) | Return air device for reflow soldering | |
| JP2010078244A (en) | Heating cooker | |
| JPH048638Y2 (en) | ||
| TW200526099A (en) | Dual stage pre-heater | |
| JPH0440603Y2 (en) | ||
| JP2509779Y2 (en) | Infrared heater | |
| JPH11118158A (en) | Heating cooker | |
| JP2001326060A (en) | Flat heater | |
| JPH0195227A (en) | Heat generating element for microwave oven | |
| KR20080005014U (en) | Cooking Device | |
| JP3645080B2 (en) | Heating device and soldering device using the same | |
| JP3495205B2 (en) | Heating equipment | |
| JP3095831U (en) | Far infrared heating element unit | |
| JPH01158684U (en) | ||
| JP3059869U (en) | Dryer structure with far infrared rays | |
| JPS6261849B2 (en) | ||
| JPH0538691Y2 (en) | ||
| JPH04339561A (en) | Preheater for automatic soldering apparatus | |
| JPS5813212Y2 (en) | microwave oven | |
| JPS5926162Y2 (en) | High frequency heating device | |
| KR200184320Y1 (en) | Convection assembly of microwave oven |