JPH07105265B2 - Method for manufacturing heat radiation fin and electric heater with heat radiation fin - Google Patents
Method for manufacturing heat radiation fin and electric heater with heat radiation finInfo
- Publication number
- JPH07105265B2 JPH07105265B2 JP11751690A JP11751690A JPH07105265B2 JP H07105265 B2 JPH07105265 B2 JP H07105265B2 JP 11751690 A JP11751690 A JP 11751690A JP 11751690 A JP11751690 A JP 11751690A JP H07105265 B2 JPH07105265 B2 JP H07105265B2
- Authority
- JP
- Japan
- Prior art keywords
- heat
- portions
- radiating
- fins
- heater
- 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 - Lifetime
Links
Landscapes
- Motor Or Generator Frames (AREA)
- Surface Heating Bodies (AREA)
- Resistance Heating (AREA)
- Electric Stoves And Ranges (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、電気暖房器等に使用する放熱フィンの製造方
法及び放熱フィン付き電気ヒータに関するものである。Description: TECHNICAL FIELD The present invention relates to a method of manufacturing a radiation fin used in an electric heater or the like, and an electric heater with a radiation fin.
［従来の技術］ 第６図（ａ）は一部を断面で示した従来の放熱フィン付
き電気ヒータの斜視図、（ｂ）はそのヒータ部分の斜視
図である。図において、（21）はヒータで、平板状のマ
イカよりなる心マイカにヒータ線（22）を巻回してその
両面を絶縁板で狭持し、さらに金属板からなる第１の保
持板（23）と第２の保持板（24）により保持し、第１の
保持板（23）の両側を折曲げてこれらを一体に結合した
ものである。（25），（25a）はヒータ線（22）に給電
するためのリード線で、ヒータ（21）の両側又は一端に
設けられている。[Prior Art] FIG. 6A is a perspective view of a conventional electric heater with a radiation fin, a part of which is shown in cross section, and FIG. 6B is a perspective view of the heater portion. In the figure, (21) is a heater, in which a heater wire (22) is wound around a core mica made of a plate-shaped mica, and both sides thereof are sandwiched by insulating plates, and further, a first holding plate (23) made of a metal plate. ) And the second holding plate (24), and both sides of the first holding plate (23) are bent to integrally join them. Lead wires (25) and (25a) for supplying power to the heater wire (22) are provided on both sides or one end of the heater (21).
（26）はアルミニウム板等からなる複数の放熱フィン
で、中央部にはヒータ（21）に圧入される押出部（27）
と、リード線（25）又は（25a）を逃げる切欠部（28）
とが設けられている。この放熱フィン（26）はその押出
部（27）がヒータ（21）の一端より１枚ずつ順次圧入さ
れ、ほぼ等しいピッチでヒータ（21）に固定したもので
ある。Reference numeral (26) is a plurality of heat radiation fins made of an aluminum plate or the like, and an extruding portion (27) which is press-fitted into the heater (21) in the central portion.
And the notch (28) that escapes the lead wire (25) or (25a)
And are provided. The radiating fins (26) are such that the extruded portions (27) are sequentially press-fitted one by one from one end of the heater (21) and fixed to the heater (21) at substantially equal pitches.
［発明が解決しようとする課題］ 上記のように構成した従来の放熱フィン付き電気ヒータ
は、次のような問題があった。[Problems to be Solved by the Invention] The conventional electric heater with heat dissipation fins configured as described above has the following problems.
（１）ヒータ線（22）で発生した熱は、第1,第２の保持
板（23），（24）を介して放熱フィン（26）に伝えられ
るため、熱伝導ロスが生じて有効な放熱が行なわれな
い。(1) The heat generated in the heater wire (22) is transferred to the heat radiation fins (26) via the first and second holding plates (23) and (24), so that heat conduction loss occurs and it is effective. No heat is dissipated.
（２）放熱フィン（26）は薄板で製作されることが多
く、押出部（27）の高さ（ａ）をあまり大きくすること
ができない。このためヒータ（21）の長手方向から１枚
ずつ押入する際、放熱フィン（26）に倒れを生ずること
があり、圧入作業が面倒である。(2) Since the heat radiation fins (26) are often made of a thin plate, the height (a) of the extruded portion (27) cannot be increased so much. Therefore, when the heaters (21) are pushed in one by one from the longitudinal direction, the heat radiation fins (26) may fall down, which makes the press-fitting operation troublesome.
（３）上述のように放熱フィン（26）の高さ（ａ）が小
さく、その上リード線（25）を逃げるための切欠部（2
8）が設けられているので、ヒータ（21）に対する放熱
フィン（26）の接触面が少ない。また、長期間使用して
いるとヒータ（21）と放熱フィン（26）の押出部（27）
との間に熱膨脹の差による間隙が生じることがあり、何
れもヒータ（１）の熱を放熱フィン（26）に有効に伝導
できない。(3) As described above, the height (a) of the heat radiation fin (26) is small, and the notch (2) for escaping the lead wire (25) is provided thereon.
8) is provided, the contact surface of the heat radiation fin (26) to the heater (21) is small. When used for a long time, the heater (21) and the radiating fin (26) push out section (27).
There may be a gap due to the difference in thermal expansion between the two, and neither of them can effectively conduct the heat of the heater (1) to the radiation fin (26).
（４）さらに、ヒータ（１）に対して放熱フィン（26）
を１枚ずつ圧入するための装置が複雑になり、しかも作
業に時間がかかるためコスト高になる。(4) Further, the radiation fins (26) for the heater (1)
The device for press-fitting one by one becomes complicated, and moreover, the work takes time, resulting in high cost.
本発明は上記の課題を解決すべくなされたもので、製作
が容易で放熱効率が高く、しかもコストを低減できる放
熱フィンの製造方法及び放熱フィン付き電気ヒータを得
ることを目的としたものである。The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for manufacturing a radiation fin and an electric heater with a radiation fin that are easy to manufacture, have high radiation efficiency, and can reduce cost. .
［課題を解決するための手段］ 本発明に係る放熱フィンの製造方法は、熱伝導の良好な
金属板にミシン目を設け、このミシン目に沿って折曲げ
加工して平坦な受熱部とこれから突出した放熱部とを交
互にかつ連続して形成し、前期放熱部を保持板のスリッ
ト穴に圧入したものである。[Means for Solving the Problems] In the method for manufacturing a heat dissipation fin according to the present invention, a metal plate having good heat conduction is provided with perforations, and a flat heat receiving portion is formed by bending along the perforations and a flat heat receiving part. The projecting heat radiating portions are formed alternately and continuously, and the heat radiating portions are pressed into the slit holes of the holding plate.
また、熱伝導の良好な金属材料によりほぼＬ字状に形成
して平坦な受熱部とこれから突出した放熱部を設けると
共に、受熱部の上下に凸部と凹部を設けて単位フィンを
構成し、この単位フィンの凸部を隣接する単位フィンの
凹部に順次嵌合して連続した放熱フィンを構成し、この
放熱フィンの放熱部を保持板のスリット穴に圧入したも
のである。Further, a flat heat-receiving portion and a heat-dissipating portion protruding from the flat heat-receiving portion formed of a metal material having good heat conductivity are provided, and convex and concave portions are provided above and below the heat-receiving portion to form a unit fin. The projections of the unit fins are sequentially fitted into the recesses of the adjacent unit fins to form a continuous radiation fin, and the radiation portion of the radiation fin is press-fitted into the slit hole of the holding plate.
さらに、本発明に係る放熱フィン付き電気ヒータは、ヒ
ータと、平坦な受熱部とこれから突出した放熱部とが交
互に形成された放熱フィンと、放熱フィンの放熱部が圧
入されるスリット穴が設けられた一対の保持板とを有
し、これら保持板のスリット穴に放熱フィンの放熱部を
圧入し、放熱フィンの受熱部でヒータを狭持してこれら
を一体に結合したものである。Furthermore, the electric heater with a radiation fin according to the present invention is provided with a heater, a radiation fin in which a flat heat receiving portion and a radiation portion protruding from this are alternately formed, and a slit hole into which the radiation portion of the radiation fin is press fitted. And a pair of holding plates provided therein, the heat radiating portions of the heat radiating fins are press-fitted into the slit holes of these holding plates, and the heater is sandwiched between the heat receiving portions of the heat radiating fins to integrally join them.
［作 用］ 本発明に係る放熱フィン付き電気ヒータにおいては、ヒ
ータからの熱はほぼ全面がヒータの表面に接触する放熱
フィンの受熱部を経て放熱部に伝導し、放熱部から効率
よく放熱される。[Operation] In the electric heater with radiating fins according to the present invention, the heat from the heater is conducted to the radiating portion through the heat receiving portion of the radiating fin where almost the entire surface is in contact with the surface of the heater, and is efficiently radiated from the radiating portion. It
［発明の実施例］ 第１は一部を切除して示した本発明実施例の斜視図、第
２図はその分解斜視図、第３図は保持板と放熱フィンと
の関係を示す断面図、第４図（ａ）は放熱フィンの加工
前の状態を示す平面図、（ｂ）は加工後の状態を示す斜
視図である。[Embodiment of the Invention] First, a perspective view of an embodiment of the present invention with a part cut away, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a cross-sectional view showing the relationship between a holding plate and a radiation fin. FIG. 4 (a) is a plan view showing a state before processing of the radiation fin, and FIG. 4 (b) is a perspective view showing a state after processing.
図において、（１）は平板状のヒータで、心マイカ
（２）に発熱線（３）を巻付けて両面に絶縁マイカ
（４），（4a）を圧着したものである。（６）はアルミ
ニウム板等からなる放熱フィンであり、ヒータ等の熱減
からの熱を受ける受熱部（７）と放熱部（８）とからな
り、放熱部（８）のつけ根部の寸法l1は、第３図、第４
図に示すように後述の保持板（10），（12）に設けたス
リット穴（13）の寸法l3に対して圧着関係となるように
設定されている。また、放熱部（８）の先端部の寸法l2
はスリット穴（13）に挿入し易いように上記l3より若干
小さく選ばれている。In the figure, (1) is a plate-shaped heater, in which a heating wire (3) is wound around a core mica (2) and insulating mica (4), (4a) is pressure-bonded on both sides. (6) is a radiating fin made of an aluminum plate or the like, which is composed of a heat receiving part (7) that receives heat from the heat loss of the heater and the like and a heat radiating part (8), and the dimension l of the base of the heat radiating part (8). 1 is shown in FIGS. 3 and 4
As shown in the figure, it is set so as to have a crimping relationship with the dimension l 3 of the slit holes (13) provided in the holding plates (10) and (12) described later. Also, the dimension l 2 of the tip of the heat dissipation part (8)
Is selected to be slightly smaller than the above l 3 so that it can be easily inserted into the slit hole (13).
この放熱フィン（６）は、第４図（ａ）に示すように幅
l1のアルミニウム等の素材平板（6a）に、放熱部（８）
の先端部の山折部、受熱部（７）の谷折部にそれぞれ折
曲げに必要なミシン目（6b），（6c）を設け、このミシ
ン目（6b），（6c）に沿って折曲げ成型して構成したも
のである。なお、この素材平板（6a）に放熱部（８）の
先端部寸法をl2とするための、角度αの切欠を設けてお
けば、折曲げ加工後先端部の寸法が自動的にl2になるの
で、加工が容易である。This heat radiation fin (6) has a width as shown in FIG. 4 (a).
the material flat plate such as aluminum of l 1 (6a), the heat radiating portion (8)
The perforations (6b) and (6c) required for folding are provided in the mountain folds at the tip of the and the valley folds of the heat receiving part (7), and are bent along these perforations (6b) and (6c). It is formed by molding. If the material flat plate (6a) is provided with a notch with an angle α to make the tip size of the heat dissipation part (8) l 2 , the tip size will automatically be l 2 after bending. Therefore, processing is easy.
（10）はアルミメッキ鋼板等からなる第１の保持板で、
放熱フィン（６）の放熱部（８）のピッチと同じピッチ
で長手寸法l3の複数のスリット穴（13）が設けられてお
り、その上下は内側に折曲げられて折曲部（11），（11
a）が形成されている。（12）はアルミメッキ鋼板等か
らなる第２の保持板で、同様にスリット穴（13）が設け
られている。(10) is the first holding plate made of aluminum plated steel plate,
A plurality of slit holes (13) having a longitudinal dimension of l 3 are provided at the same pitch as that of the heat radiating portions (8) of the heat radiating fins (6), and the upper and lower parts of the slit holes are bent inward to form bent portions (11). , (11
a) has been formed. Reference numeral (12) is a second holding plate made of an aluminum-plated steel plate or the like and similarly provided with a slit hole (13).
次に、上記のように構成した本発明の組立手順の一例を
説明する。先ず、素材平板（6a）を折曲げ成型した放熱
フィン（６）の放熱部（８）を、第１の保持板（10）と
第２の保持板（12）のスリット穴（13）にそれぞれ挿入
し、受熱部（７）を加圧して放熱部（８）をスリット穴
（13）にそれぞれ圧入し、第１の保持板（10）と放熱フ
ィン（６）及び第２の保持板（12）と放熱フィン（６）
とをそれぞれ一体的に結合する。次に、両放熱フィン
（６），（６）の受熱部（７），（７）でヒータ（１）
を狭持し、第１の保持板（10）の折曲部（11），（11
a）を折曲げてかしめることにより、ヒータ（１）、第
１の保持板（10）と結合された放熱フィン（６）及び第
２の保持板（12）と結合された放熱フィン（６）は一体
的に結合され、電気ヒータの組立が完了する。Next, an example of the assembling procedure of the present invention configured as described above will be described. First, the heat dissipating portion (8) of the heat dissipating fin (6) formed by bending the material flat plate (6a) into the slit holes (13) of the first holding plate (10) and the second holding plate (12), respectively. Then, the heat receiving portion (7) is pressed and the heat radiating portion (8) is pressed into the slit holes (13) respectively, and the first holding plate (10), the radiation fins (6) and the second holding plate (12) are inserted. ) And radiating fins (6)
And are integrally combined. Next, in the heat receiving parts (7) and (7) of both the radiation fins (6) and (6), the heater (1)
The first holding plate (10) and the bent parts (11), (11
By bending and caulking a), the heat radiation fins (6) connected to the heater (1), the first holding plate (10) and the heat radiation fins (6) connected to the second holding plate (12). ) Are joined together to complete the assembly of the electric heater.
第５図は放熱フィンの別の実施例を示す斜視図である。
本実施例は比較的厚い例えばアルミニウム板をＬ字状に
折曲げて受熱部（7a）と放熱部（8a）を構成すると共
に、受熱部（7a）の上下に凸部（17）と凹部（18）を設
けて複数の単位フィン（16）を構成し、凸部（17）を隣
接する単位フィン（16）の凹部（18）にそれぞれ結合し
て連続した放熱フィン（６）を構成したものである。FIG. 5 is a perspective view showing another embodiment of the radiation fin.
In this embodiment, a relatively thick aluminum plate, for example, is bent in an L shape to form a heat receiving portion (7a) and a heat radiating portion (8a), and a convex portion (17) and a concave portion (above and below) of the heat receiving portion (7a) are formed. 18) is provided to form a plurality of unit fins (16), and the protrusions (17) are respectively coupled to the recesses (18) of the adjacent unit fins (16) to form a continuous heat dissipation fin (6). Is.
このように構成した放熱フィン（６）とヒータ（１）と
の組立手順は、前述した第１の実施例の場合と同様であ
る。The procedure for assembling the heat dissipation fin (6) and the heater (1) thus configured is the same as in the case of the first embodiment described above.
なお、上記の実施例ではアルミニウム板をＬ字状に折曲
げて単位フィン（16）を構成した場合を説明したが、例
えばダイカスト鋳造により単位フィンを構成してもよ
い。Although the unit fins (16) are formed by bending an aluminum plate into an L shape in the above embodiment, the unit fins may be formed by die casting, for example.
上記の説明では第１の保持板（10）に設けた折曲部（1
1），（11a）により、ヒータ（１）及び放熱フィン
（６）が結合された第２の保持板（12）を一体的に結合
した場合を示したが、第１の保持板（10）も第２の保持
板（12）に同様に平板状に形成し、別に設けたかしめ金
具によりこれらを一体的に結合してもよい。In the above description, the bending portion (1) provided on the first holding plate (10)
The case where the second holding plate (12) to which the heater (1) and the heat radiation fins (6) are joined is integrally joined by 1) and (11a) has been shown. Similarly, the second holding plate (12) may be similarly formed in a flat plate shape, and they may be integrally connected by a separately provided caulking metal fitting.
［発明の効果］ 本発明に係る放熱フィンの製造方法は、平坦部からなる
受熱部と、これから突出した放熱部を交互にかつ連続し
て形成した一連の複数個の放熱フィンをあらかじめ加工
しておき、この放熱フィンの放熱部を保持板に設けたス
リット穴に一度に圧入して一体化するようにしたので、
製造時間が短縮され、製造のための装置も簡便化されて
コストを低減することができる。[Advantages of the Invention] In the method of manufacturing a heat radiation fin according to the present invention, a series of a plurality of heat radiation fins in which a heat receiving portion formed of a flat portion and a heat radiation portion protruding therefrom are alternately and continuously formed are processed in advance. Then, the heat dissipation part of this heat dissipation fin was press-fitted into the slit hole provided in the holding plate at one time to integrate it.
The manufacturing time can be shortened, the apparatus for manufacturing can be simplified, and the cost can be reduced.
また、本発明に係る放熱フィン付き電気ヒータは、上記
の放熱フィンの受熱部によりヒータを狭持してこれらを
一体に結合するようにしたので、放熱フィンの受熱部が
直接ヒータに圧着されるため、熱源からの熱を効率よく
放熱部に伝導することができる。また、長期間使用して
もヒータと放熱フィンの受熱部との間にすき間を生じる
ようなことはないので、長期にわたって安定した放熱効
果を得ることができる。さらに、放熱フィンの製造及び
ヒータへの取付けが容易で製造のための装置も簡便化で
きるので、コストを低減することができる。Further, in the electric heater with radiating fins according to the present invention, the heater is sandwiched by the heat receiving portions of the radiating fins so that they are integrally connected, so that the heat receiving portions of the radiating fins are directly pressed to the heater. Therefore, the heat from the heat source can be efficiently conducted to the heat dissipation portion. Further, even if it is used for a long period of time, there is no gap between the heater and the heat receiving portion of the heat radiation fin, so that a stable heat radiation effect can be obtained for a long period of time. Further, since the radiation fin can be easily manufactured and attached to the heater, and the manufacturing device can be simplified, the cost can be reduced.
第１図は一部を断面で示した本発明実施例の斜視図、第
２図はその分解斜視図、第３図は保持板と放熱フィンと
の関係を示す断面図、第４図（ａ）は放熱フィンの加工
前の状態を示す平面図、（ｂ）は加工後の状態を示す要
部斜視図、第５図は放熱フィンの他の実施例の斜視図、
第６図は（ａ）は一部を断面で示した従来の放熱フィン
付き電気ヒータの一例の斜視図、（ｂ）はそのヒータ部
分の斜視図である。 図において、（１）はヒータ、（４），（4a）は絶縁マ
イカ、（６）は放熱フィン、（6a）は素材平板、（6
b），（6c）はミシン目、（７）は受熱部、（８）は放
熱部、（10），（12）は保持板、（13）はスリット穴で
ある。 なお、図中同一符号は同一、又は相当部分を示す。FIG. 1 is a perspective view of an embodiment of the present invention partially shown in cross section, FIG. 2 is its exploded perspective view, FIG. 3 is a cross sectional view showing the relationship between a holding plate and a radiation fin, and FIG. ) Is a plan view showing a state before processing of the radiation fin, (b) is a perspective view of a main part showing a state after processing, and FIG. 5 is a perspective view of another example of the radiation fin,
FIG. 6A is a perspective view of an example of a conventional electric heater with a heat radiation fin, a part of which is shown in cross section, and FIG. 6B is a perspective view of the heater portion. In the figure, (1) is a heater, (4) and (4a) are insulating mica, (6) is a radiating fin, (6a) is a flat plate, and (6)
b) and (6c) are perforations, (7) is a heat receiving part, (8) is a heat radiating part, (10) and (12) are holding plates, and (13) is a slit hole. The same reference numerals in the drawings indicate the same or corresponding parts.
Claims (3)
成する谷折部と該受熱部から突出した放熱部を形成する
山折部とにミシン目を設け、該ミシン目に沿って折曲げ
成型して受熱部と放熱部とを交互にかつ連続して形成
し、前記放熱部を保持板に設けたスリット穴に圧入した
ことを特徴とする放熱フィンの製造方法。1. A perforation is provided in a valley fold forming a flat heat receiving portion and a mountain fold forming a heat radiating portion protruding from the heat receiving portion on a metal plate having good heat conduction, and along the perforation. A method for manufacturing a radiation fin, comprising bending and forming heat receiving portions and heat radiation portions alternately and continuously, and press-fitting the heat radiation portions into slit holes provided in a holding plate.
に形成して平坦な受熱部とこれから突出した放熱部を設
けると共に、前記受熱部の上下に凸部と凹部とを設けて
単位フィンを構成し、該単位フィンの凸部を隣接する単
位フィンの凹部に順次嵌合して連続した放熱フィンを構
成し、該放熱フィンの放熱部を保持板に設けたスリット
穴に圧入したことを特徴とする放熱フィンの製造方法。2. A unit formed by forming a substantially L-shaped metal material having good heat conduction into a flat heat receiving portion and a heat radiating portion protruding from the flat heat receiving portion, and providing a convex portion and a concave portion above and below the heat receiving portion. The fins are formed, and the convex portions of the unit fins are sequentially fitted into the concave portions of the adjacent unit fins to form a continuous radiating fin, and the radiating portion of the radiating fin is press-fitted into the slit hole provided in the holding plate. A method for manufacturing a heat radiation fin, comprising:
導の良好な金属材料からなり、平坦な受熱部と該受熱部
から突出した放熱部とが交互に形成された放熱フィン
と、 該放熱フィンの放熱部が圧入されるスリット穴が設けら
れた一対の保持板とを有し、 該一対の保持板のスリット穴に前記放熱フィンの放熱部
をそれぞれ圧入し、前記放熱フィンの受熱部により前記
ヒータを狭持してこれらを一体に結合したことを特徴と
する放熱フィン付き電気ヒータ。3. A heater having insulating plates disposed on both sides thereof, and a radiation fin made of a metal material having good heat conduction, wherein flat heat receiving portions and heat radiating portions protruding from the heat receiving portions are alternately formed. And a pair of holding plates provided with slit holes into which the heat radiating portions of the heat radiating fins are press-fitted, and the heat radiating portions of the heat radiating fins are press-fitted into the slit holes of the pair of holding plates, respectively. An electric heater with radiating fins, characterized in that the heater is sandwiched by a heat receiving portion and these are integrally joined.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11751690A JPH07105265B2 (en) | 1990-05-09 | 1990-05-09 | Method for manufacturing heat radiation fin and electric heater with heat radiation fin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11751690A JPH07105265B2 (en) | 1990-05-09 | 1990-05-09 | Method for manufacturing heat radiation fin and electric heater with heat radiation fin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0417546A JPH0417546A (en) | 1992-01-22 |
| JPH07105265B2 true JPH07105265B2 (en) | 1995-11-13 |
Family
ID=14713703
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11751690A Expired - Lifetime JPH07105265B2 (en) | 1990-05-09 | 1990-05-09 | Method for manufacturing heat radiation fin and electric heater with heat radiation fin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07105265B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5989044B2 (en) * | 2014-08-12 | 2016-09-07 | 三菱電機株式会社 | Positive temperature coefficient thermistor device |
| CN107655060B (en) * | 2017-09-30 | 2020-10-30 | 广东美的环境电器制造有限公司 | Heating device |
-
1990
- 1990-05-09 JP JP11751690A patent/JPH07105265B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0417546A (en) | 1992-01-22 |
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