KR970002281Y1 - Circuit for fan failure detecting of refrigerator's storage room - Google Patents

Circuit for fan failure detecting of refrigerator's storage room Download PDF

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Publication number
KR970002281Y1
KR970002281Y1 KR2019930008629U KR930008629U KR970002281Y1 KR 970002281 Y1 KR970002281 Y1 KR 970002281Y1 KR 2019930008629 U KR2019930008629 U KR 2019930008629U KR 930008629 U KR930008629 U KR 930008629U KR 970002281 Y1 KR970002281 Y1 KR 970002281Y1
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South Korea
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temperature
refrigerator
refrigerator compartment
fan
compartment
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KR2019930008629U
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Korean (ko)
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KR940027259U (en
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고배경
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대우전자주식회사
배순훈
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/067—Evaporator fan units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/36—Visual displays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/121—Sensors measuring the inside temperature of particular compartments

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

내용없음No content

Description

냉장고의 냉장실용 팬 고장검출회로Refrigerator fan detection circuit for refrigerators

제1도는 냉장고의 요부 측단면도.1 is a side cross-sectional view of the main portion of the refrigerator.

제2도는 본 고안이 적용된 회로도.2 is a circuit diagram to which the present invention is applied.

제3도는 본 고안에 의한 플로우 차트.3 is a flow chart according to the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10 : 마이컴 11 : LED 구동부10: microcomputer 11: LED driver

12 : LED 13 : 냉동실 온도감지부12: LED 13: freezer compartment temperature detection unit

14 : 냉기 통로온도 감지부 15 : 냉장실 온도감지부14: cold air passage temperature detection unit 15: cold room temperature detection unit

16 : 냉장실 온도 설정부 19 : 냉장실 팬 구동부16: refrigerator compartment temperature setting unit 19: refrigerator compartment fan drive unit

본 고안은 냉장실의 온도제어를 냉장실에 마련된 별도의 냉장실 전용 팬으로 하는 냉장고에 있어서, 상기 냉장실 전용 팬의 고장을 검출할 수 있도록 한 냉장고의 냉장실용 팬 고장검출회로에 관한 것이다.The present invention relates to a refrigerator failure detection circuit for a refrigerator compartment in which a refrigerator having a temperature control of the refrigerator compartment as a separate refrigerator compartment fan provided in the refrigerator compartment can detect a failure of the refrigerator compartment exclusive fan.

종래, 본 출원인이 선 출원한 국내 특허 제93-1787호 '냉장고의 제상방법 및 장치'는 냉장고의 냉장실을 종래에 사용하던 냉기조절용 댐퍼를 사용하지 않는 대신 냉장실 전용 팬을 마련하여 냉기의 유입을 제어하는 냉장고로서, 이를 제1도를 통하여 알아보면, 도면에서와 같이 냉장실(3)에 냉장실 전용 팬모터(RFM)를 설치하여 그 팬의 구동으로 냉각기(5)에서 형성된 냉기가 냉장실(3)로 투입되도록 하여 냉장실(3)의 온도를 미도시된 온도설정수단을 통해 설정된 온도와 동일하도록 상기 냉장실 전용팬을 제어하는 것이다.Conventionally, Korean Patent No. 93-1787, 'Defrosting Method and Apparatus of Refrigerator', filed by the applicant in advance, provides a refrigerator compartment dedicated fan instead of using a refrigerator control damper that used a refrigerator compartment. As a refrigerator to control, this is illustrated in FIG. 1, by installing a refrigerating chamber dedicated fan motor (RFM) in the refrigerating compartment 3 as shown in the drawing, and the cold air formed in the cooler 5 by driving the fan. The refrigeration chamber dedicated fan is controlled so that the temperature of the refrigerating chamber 3 is equal to the temperature set by the temperature setting means (not shown).

이때 냉장실(3)의 온도는 냉장실 온도센서(TH3)(TH4)에 의해 감지되어지는 것이다.At this time, the temperature of the refrigerating compartment 3 is detected by the refrigerating compartment temperature sensor TH3 (TH4).

따라서, 이와 같은 냉장방식의 냉장고에 있어서, 냉장실 전용 팬의 기능은 대단히 중요하며 냉장고의 효율을 좌우한다.Therefore, in such a refrigerator-type refrigerator, the function of the refrigerator-only fan is very important and determines the efficiency of the refrigerator.

본 고안은 상기한 배경아래서 안출된 것으로, 전술한 냉장실 전용 팬모터가 고장 또는 불량을 일으켰을 경우, 이를 하드웨어(HARDWARE)적인 추가회로없이 기존회로를 적용하여 불량을 검출할 수 있도록 함으로써 추가의 원가상승이 불필요하도록 한 냉장실 전용 팬 불량 검출회로를 제공함에 본 고안의 목적이 있다.The present invention is conceived under the above-mentioned background, and if the above-mentioned dedicated refrigerator motor fan failure or failure, additional cost increase by allowing the existing circuit can be detected by applying the existing circuit without additional hardware (HARDWARE) It is an object of the present invention to provide a refrigerator failure detection circuit dedicated to a refrigerating compartment, which makes this unnecessary.

이와 같은 목적을 달성하기 위한 본 고안은 상기 냉장실 팬을 일정시간 구동하여 냉기를 냉장실로 투입했음에도 냉장실 온도센서를 통해 감지된 냉장실의 온도가 떨어지지 않았을 경우, 이를 냉장실 팬의 불량으로 판단하도록 하는 것을 특징으로 한다.The present invention for achieving the above object is characterized in that if the temperature of the refrigerator compartment detected by the refrigerator compartment temperature sensor does not fall even though the refrigerator compartment fan is driven for a predetermined time and the cold air is introduced into the refrigerator compartment. It is done.

이하 첨부된 도면에 의거하여 본 고안을 설명한다.Hereinafter, the present invention will be described based on the accompanying drawings.

제1도는 본 고안을 적용한 냉장고(1)의 요부 측단면도를 나타낸 것으로, 냉동실(2)의 한측면에는 냉각기(5) 및 냉장실용 팬모터(RFM)가 마련되어, 이 팬모터(RFM)의 회전으로 냉각기(5)의 냉기가 냉동실(2)로 투입되며, 이때 투입된 냉기는 냉기통로(6)를 통해 다시 냉각기(5)로 순환한다. 또한, 냉동실(2)에는 온도센서(TH1)가 설치되어 냉동실(2)의 온도를 감지한다.1 is a cross-sectional side view of the main part of the refrigerator 1 to which the present invention is applied, and on one side of the freezer compartment 2, a cooler 5 and a refrigerator motor fan motor (RFM) are provided, and the rotation of the fan motor (RFM) is performed. As a result, the cool air of the cooler 5 is introduced into the freezing chamber 2, and the injected cool air is circulated back to the cooler 5 through the cool air passage 6. In addition, the freezing chamber 2 is installed with a temperature sensor TH1 to sense the temperature of the freezing chamber 2.

한편, 냉장실(3)에도 별도의 냉장실용 팬모터(RFM)를 마련하고 그 팬의 구동으로 냉각기(5)로 부터의 냉기가 냉장실(3)로 투입되며, 이때 투입된 냉기는 냉장실(3)의 식품을 냉각한 뒤 냉기통로(7)를 통해 다시 냉각기(5)로 순환한다.Meanwhile, in the refrigerating compartment 3, a separate refrigerating compartment fan motor (RFM) is also provided, and cold air from the cooler 5 is introduced into the refrigerating compartment 3 by driving the fan. The food is cooled and then circulated back to the cooler 5 through the cold air passage 7.

또한, 온도센서(TH4)가 마련되어 냉장실(3)의 온도를 감지하며, 상기 냉기통로(7)에도 온도센서(TH3)가 설치되어 그곳의 온도를 감지한다. 4는 역류방지 고무판으로 냉장실(3)에서 냉기통로(7)로 흐르는 냉기는 통과시키나 냉기통로(7)로부터 냉각기(5)로 흐르는 냉기는 차단함으로써, 냉기의 역류현상을 방지하여 주게 된다.In addition, the temperature sensor TH4 is provided to sense the temperature of the refrigerating chamber 3, and the temperature sensor TH3 is also installed in the cold passage 7 to sense the temperature there. 4 is a backflow prevention rubber plate to prevent the cold air flowing from the cold compartment 3 to the cold air passage 7 but to prevent the cold air flowing from the cold air passage 7 to the cooler 5, thereby preventing the back flow of cold air.

또한, 냉기통로(7)에는 제상용 히터(H1)(H2)가 설치되어 제상시에 통전되는데, 본 고안이 적용된 냉장고의 제상시스템을 대략 설명하면 우선, 제상시기가 도래하면 냉장실 팬모터(RFM)를 구동하여 냉장실(3)에 존재하던 비교적 상온인 냉기가 냉기통로(7)를 통해 냉각기(5)로 전해지도록하여 자연제상을 시도한다. 이때 온도센서(TH3)를 통해 감지되는 온도가 제상에 필요한 적정온도 이하로 떨어지면 상기 히터(H1)(H2)를 구동하여 강제제상을 행한다. 차후 강제제상의 여파로 냉장실(3)의 온도(온도센서(TH4)로 검출)가 소정온도(자연제상 가능온도)로 상승하면 상기 히터(H1)(H2)의 구동을 중지시키고 전술한 자연제상을 시도한후, 냉각기(5)에 취부된 온도센서(TH2)를 통해 제상완료 온도가 검출되면, 제상작업을 완료시킨다.In addition, the defrost heater (H1) (H2) is installed in the cold air passage (7) and is energized at the time of defrost. When the defrosting system of the refrigerator to which the present invention is applied is roughly described, first of all, when the defrost time arrives, a refrigerator motor fan (RFM) ) And attempts a natural defrosting by allowing the relatively cold air present in the refrigerating chamber 3 to be delivered to the cooler 5 through the cold air passage 7. At this time, if the temperature sensed by the temperature sensor TH3 falls below the appropriate temperature required for defrosting, the heaters H1 and H2 are driven to perform forced defrosting. When the temperature of the refrigerating chamber 3 (detected by the temperature sensor TH4) rises to a predetermined temperature (natural defrostable temperature) in the aftermath of the forced defrost, the driving of the heaters H1 and H2 is stopped and the aforementioned natural defrosting is performed. After attempting, if the defrosting completion temperature is detected through the temperature sensor TH2 attached to the cooler 5, the defrosting operation is completed.

따라서, 온도센서(TH3)(TH4)는 제상시와 냉장실(3) 온도제어시 중요한 역할을 하게 된다.Therefore, the temperature sensors TH3 and TH4 play an important role in defrosting and controlling the temperature of the refrigerating chamber 3.

제2도는 상기와 같은 냉장고(1)의 제어회로도를 도시한 것으로, 본 고안에 따른 일정프로그램을 내장한 원칩 마이컴(10)(MICOM : MICRO-COMPUTER)과, 상기 마이컴(10)의 출력포트군(群)(POn)에 접속되고, 숫자표시용LED(12)(발광다이오드)를 구동하는 LED구동부(11)와, 온도센서(TH1), 저항(R1)(R2), 콘덴서(C1)(C2)로 구성되고 냉동실(2)의 온도를 감지하여 마이컴(10)의 입력포트(PI1)로 그에 따른 일정신호를 입력하여 주는 냉동실 온도감지부(13)와, 온도센서(TH13), 저항(R3)(R4), 콘덴서(C3)(C4)로 이루어지고 마이컴(10)의 입력포트(PI2)에 접속되어 냉기통로(7)의 온도를 감지하는 냉기통로 온도감지부(14)와, 온도센서(TH4), 저항(R5)(R6), 콘덴서(C5)(C6)로 이루어지고, 마이컴(10)의 입력포트(PI3)에 접속되어 냉장실(3)의 온도를 감지하는 냉장실 온도감지부(15)와, 「강」 온도 설정스위치(S1), 「중」 온도 설정스위치(S2), 「약」 온도 설정스위치(S3). 저항(R7∼R12)으로 이루어지고, 마이컴(10)의 입력포트(PI4∼PI6)에 접속되어 상기 스위치(S1∼S3)의 입력신호로 냉장실(3)의 온도가 설정되어 이 설정된 온도를 기준으로 냉장실 팬을 구동할 수 있는 근거를 마련하여 주는 냉장실 온도 설정부(16)와, 인버터(TV1), 다이오드(D1), 릴레이(RY1) 및 압축기(CP)로 이루어지고 마이컴(10)의 출력포트(PO1)에 접속되어 마이컴(10)이 이 출력포트(PO1)로 하이신호를 출력하면 인버터(TV1)를 통해 반전되고 릴레이(RY1)가 도통되어 압축기(CP)가 구동되는 압축기 구동부(17)와, 인버터(TV2), 다이오드(D2), 릴레이(RY2) 및 냉동실 전용 팬모터(RFM)로 이루어지고 마이컴(10)의 출력포트(PO2)에 접속되어 상기 마이컴(10)의 하이신호 출력으로 냉장실 팬모터(RFM)를 구동시키는 냉장실 팬 구동부(18)와, 인버터(TV3), 다이오드(D3), 릴레이(RY3) 및 냉장실 팬모터(RFM)로 이루어지고 마이컴(10)의 출력포트(PO3)에 접속되어 마이컴(10)의 하이신호 출력으로 냉장실 팬모터(RFM)를 구동시키는 냉장실 팬 구동부(19)로 본 고안은 구성되어 있다.2 is a control circuit diagram of the refrigerator 1 as described above. The one-chip microcomputer 10 (MICOM: MICRO-COMPUTER) incorporating a schedule program according to the present invention and the output port group of the microcomputer 10 are shown. (I) an LED driver 11 connected to POn and driving the LED 12 (light emitting diode) for display of numbers, a temperature sensor TH1, a resistor R1 (R2), and a capacitor C1 ( C2) and a freezer compartment temperature sensing unit 13 for sensing a temperature of the freezer compartment 2 and inputting a predetermined signal according to the input port PI1 of the microcomputer 10, a temperature sensor TH13, and a resistance ( A cold air passage temperature sensing unit 14 consisting of R3, R4 and condenser C3 and C4 and connected to the input port PI2 of the microcomputer 10 to sense the temperature of the cold air passage 7, The refrigerator compartment temperature sensing unit comprising a sensor TH4, resistors R5, R6, and capacitors C5, C6 and connected to an input port PI3 of the microcomputer 10 to sense the temperature of the refrigerator compartment 3 (15) and "strong" temperature setting switch ( S1), the "medium" temperature setting switch S2, and the "weak" temperature setting switch S3. Comprising resistors R7 to R12, connected to the input ports PI4 to PI6 of the microcomputer 10, the temperature of the refrigerating chamber 3 is set as an input signal of the switches S1 to S3, and is referred to the set temperature. The refrigerator compartment temperature setting unit 16, which provides the basis for driving the refrigerator compartment fan, and the inverter TV1, the diode D1, the relay RY1, and the compressor CP, and the output of the microcomputer 10 When the microcomputer 10 is connected to the port PO1 and outputs a high signal to the output port PO1, the compressor driver 17 inverts through the inverter TV1 and conducts the relay RY1 so that the compressor CP is driven. ), An inverter (TV2), a diode (D2), a relay (RY2), and a freezer compartment fan motor (RFM), connected to the output port PO2 of the microcomputer 10 to output a high signal of the microcomputer 10. The refrigerator compartment fan drive unit 18 for driving the refrigerator compartment fan motor RFM with an inverter, the inverter TV3, the diode D3, the relay RY3 and the refrigerator compartment The present invention consists of a refrigerating compartment fan drive unit 19 which is composed of a fan motor (RFM) and connected to an output port PO3 of the microcomputer 10 to drive a refrigerating chamber fan motor RFM with a high signal output of the microcomputer 10. It is.

상기와 같이 구성시켜서된 본 고안의 작용 및 효과를 제3도의 작동 플로우챠트를 통하여 설명한다.The operation and effects of the present invention constructed as described above will be described with reference to the operation flowchart of FIG.

먼저 본 고안에 따른 회로에 전원(AC)(Vcc)이 인가되면, 마이컴(10)은 냉장실 온도 설정부(16)를 통해 현재 설정된 냉장실의 온도를 검출한다.First, when a power source (AC) (Vcc) is applied to the circuit according to the present invention, the microcomputer 10 detects the temperature of the refrigerator compartment currently set through the refrigerator compartment temperature setting unit 16.

이때 「강」스위치(S1)가 입력되어 「강」 온도(냉장실 온도를 0oC∼-2oC로 유지)가 설정되면 마이컴(10)은 냉장실 팬 구동부(19)로 하이신호를 출력하여 냉장실 팬모터(RFM)를 구동시킴으로서, 냉기를 냉장실(3)로 불어 놓어 주게된다. 따라서 냉장실(3)의 온도는 하강하게 되고 냉장실 온도센서(TH4)를 통해 냉장실(3)의 온도를 감지하되, 냉장실 팬 구동 오프온도(-2oC)가 검출되면 냉장실 팬을 오프시키나, 상기 냉장실 팬이 구동한 뒤 일정시간(예 : 1시간)이 경과하도록 냉장실 핀 구동 오프온도(-2oC)로 떨어지지 않으면, 이를 냉장실 팬의 고장으로 기인된 현상으로 판단하고, LED구동부(11)로 냉장실 팬을 고장에 따른 특정 에러코드(ERROR CODE) 신호를 출력하여 LED(12)에 그 코드가 디스플레이 되어 외부에서 고장상태를 인식하게 된다.At this time, a "strong" when the switch (S1) are input to a "High" temperature (keeping the temperature in the refrigerator compartment 0 o C~-2 o C) setting the microcomputer 10 is the refrigerator compartment fan driver 19 to output a high signal By driving the refrigerator compartment fan motor (RFM), the cold air is blown into the refrigerator compartment (3). Therefore, the temperature of the refrigerating compartment 3 decreases and detects the temperature of the refrigerating compartment 3 through the refrigerating compartment temperature sensor TH4, but turns off the refrigerating compartment fan when the refrigerating compartment fan driving off temperature (-2 o C) is detected. If the refrigerator compartment fan does not fall to the fridge drive off temperature (-2 o C) after a certain time (eg 1 hour) after the refrigerator is driven, it is determined to be a phenomenon caused by the failure of the refrigerator compartment fan, and the LED driver 11 By outputting a specific error code (ERROR CODE) signal according to the failure of the refrigerator compartment fan, the code is displayed on the LED 12 to recognize the failure state from the outside.

또한 상기 1시간 이내에 냉장실(3)의 온도가 팬 오프 온도로 떨어지면 냉장실 팬모터(RFM)의 구동은 정상적으로 제어된다.In addition, when the temperature of the refrigerating compartment 3 drops to the fan-off temperature within the one hour, the driving of the refrigerating compartment fan motor RFM is normally controlled.

상기는 냉장실 온도가「강」으로 설정되었을 경우를 일례로 들었으나, 냉장실 온도가「중」 온도(예 : 0∼1∼oC) 또는「약」 온도(예 : 1∼3oC)로 설정되었을 경우에도 작용은 동일하다.The above is an example of the case where the refrigerating chamber temperature is set to "strong", but the refrigerating chamber temperature is set to "medium" temperature (for example, 0 to 1 to o C) or "weak" temperature (for example to 1 to 3 o C). Even if set, the behavior is the same.

이상에서와 같이 본 고안은 다른 부품을 사용하지 않고 기존부품만으로 냉장실 팬의 불량을 감지할 수 있으므로 원가절감의 효과가 있다.As described above, the present invention can reduce the cost of the refrigerator compartment fan by detecting only the existing parts without using other parts.

Claims (1)

냉장실 전용 팬을 구비하여 냉장실(3)의 온도를 제어하는 냉장고(1)에 있어서, 냉장실의 온도를 검출하는 냉장실 온도 감지부(15)와, 냉장실(3)의 온도를 일정 키입력으로 설정하여 주는 냉장실 온도 설정부(16)와, 냉장실에 마련된 전용 팬을 구동하는 냉장실 팬 구동부(19)와, 상기 냉장실 온도 설정부(16)에서 설정된 온도를 기준으로 냉장실 팬의 구동을 제어하되, 일정시간 동안 냉장실(3)의 온도가 설정온도를 하강하지 아니하면 LED구동부(11)에 냉장실 팬의 구동고장에 따른 일정코드신호를 출력하는 마이컴(10)과, 상기 LED구동부(11)의 출력으로 냉장실 팬의 고장에 대한 일정코드를 표기하는 LED(12)로 구성한 것을 특징으로 하는 냉장고의 냉장실용 팬 고장 검출회로.In the refrigerator 1 having a refrigerator compartment dedicated fan to control the temperature of the refrigerator compartment 3, the refrigerator compartment temperature sensing unit 15 for detecting the temperature of the refrigerator compartment and the temperature of the refrigerator compartment 3 are set by a predetermined key input. The main unit controls the driving of the refrigerator compartment fan based on the temperature set by the refrigerator compartment temperature setting unit 16, the refrigerator compartment fan driving unit 19 driving the dedicated fan provided in the refrigerator compartment, and the refrigerator compartment temperature setting unit 16, for a predetermined time. If the temperature of the refrigerating compartment (3) does not fall during the set temperature during the microcomputer 10 to output a constant code signal according to the driving failure of the refrigerating chamber fan to the LED driver 11, the refrigerating compartment by the output of the LED driver 11 A refrigerator failure detection circuit for a refrigerator compartment, characterized in that the refrigerator (12) indicates a constant code for a failure of the fan.
KR2019930008629U 1993-05-21 1993-05-21 Circuit for fan failure detecting of refrigerator's storage room KR970002281Y1 (en)

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KR2019930008629U KR970002281Y1 (en) 1993-05-21 1993-05-21 Circuit for fan failure detecting of refrigerator's storage room

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Application Number Priority Date Filing Date Title
KR2019930008629U KR970002281Y1 (en) 1993-05-21 1993-05-21 Circuit for fan failure detecting of refrigerator's storage room

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KR940027259U KR940027259U (en) 1994-12-09
KR970002281Y1 true KR970002281Y1 (en) 1997-03-21

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