JPH0130438B2 - - Google Patents
Info
- Publication number
- JPH0130438B2 JPH0130438B2 JP56187636A JP18763681A JPH0130438B2 JP H0130438 B2 JPH0130438 B2 JP H0130438B2 JP 56187636 A JP56187636 A JP 56187636A JP 18763681 A JP18763681 A JP 18763681A JP H0130438 B2 JPH0130438 B2 JP H0130438B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- frost
- case
- frost detection
- light emitting
- 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
- 238000001514 detection method Methods 0.000 claims description 16
- 230000003595 spectral effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 6
- 229920003002 synthetic resin Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000010257 thawing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
- G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
Landscapes
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
【発明の詳細な説明】
本発明は冷蔵庫の冷却器等に使用する霜検出装
置に関するもので、発光、受光素子を被うケース
を前記発光素子の分光分布と近似した光透過特性
を有する樹脂で成形し、このケースによつて可視
光は遮蔽し発光素子の光のみを透過するようにし
たものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frost detection device used in a refrigerator cooler, etc., in which a case covering a light-emitting and light-receiving element is made of a resin having light transmission characteristics similar to the spectral distribution of the light-emitting element. This case blocks visible light and allows only the light from the light emitting element to pass through.
一般に冷蔵庫等冷凍機の蒸発器に付着した霜の
除去は、圧縮機運転時間積算により一定時間毎に
除霜したり、あるいは冷蔵室及び冷凍室扉開閉回
数を計数して一定回数に達すると除霜を行うもの
であつた。ところが冷蔵庫等の蒸発器への着霜は
冷蔵庫本体外気温や湿度、冷蔵室及び冷凍室扉開
閉頻度、又冷蔵庫内に貯蔵される内容物に大きく
左右され、上述の如き方法では除霜の不必要時に
除霜を行つたり、蒸発器に多量に着霜し冷凍能力
が低下しているにもかかわらず除霜が行われない
等の欠点があつた。 Generally, frost adhering to the evaporator of refrigerators and other freezers can be removed by defrosting at fixed intervals by integrating the operating hours of the compressor, or by counting the number of openings and closings of the refrigerator and freezer compartment doors and removing the frost when a fixed number of times is reached. It was meant to cause frost. However, the formation of frost on the evaporator of a refrigerator, etc. is greatly affected by the outside temperature and humidity of the refrigerator, the frequency of opening and closing of the refrigerator and freezer compartment doors, and the contents stored in the refrigerator. There were disadvantages such as defrosting was not carried out when necessary, and defrosting was not carried out even though a large amount of frost formed on the evaporator and the refrigeration capacity was reduced.
そこで、この様な欠点を解消するために、着霜
を直接検知する手段として発光ダイオード等の発
光素子とヘトトランジスタ等の受光素子を用いた
霜検出装置が種々提案されているが、いずれも発
光素子、受光素子は該素子の光を通過せしめる開
口を有するケース、あるいはこの開口にレンズ等
を備えたケースに収納しており、該ケースの開口
又は開口に備えたレンズ等に霜や水滴が付着しや
すく誤動作の恐れがあつた。また発光素子、受光
素子は外部の雰囲気、特に水分と冷熱サイクルの
影響で特性が変化しやすいことから、外部の雰囲
気としや断した構造を持つ霜検出装置が望まれて
いた。 In order to overcome these drawbacks, various frost detection devices have been proposed that use light-emitting elements such as light-emitting diodes and light-receiving elements such as hetotransistors as a means of directly detecting frost formation. The element and light-receiving element are housed in a case that has an aperture that allows the light from the element to pass through, or a case that has a lens, etc. in this aperture, and frost or water droplets may adhere to the aperture of the case or the lens, etc. provided in the aperture. It was easy to do so, and there was a risk of malfunction. Furthermore, since the characteristics of the light-emitting element and the light-receiving element are likely to change due to the influence of the external atmosphere, particularly moisture and cooling/heating cycles, there has been a desire for a frost detection device that has a structure that is disconnected from the external atmosphere.
本発明はかかる欠点を除去することを目的とし
たものであり、以下その一実施例を添付図面によ
り説明する。 The present invention aims to eliminate such drawbacks, and one embodiment thereof will be described below with reference to the accompanying drawings.
第1図および第2図において、1は冷蔵庫等冷
凍機の蒸発器であり、2は冷媒の通るパイプ、3
はこのパイプ2に直交して配設されたフインプレ
ート、4はフインプレート3に設けた霜検知孔、
5は前記霜検知孔4を介してお互いに相対向して
設けられた霜検出装置である。前記霜検出装置5
は可視光を遮蔽し発光素子光のみを優先的に透過
するポリカーボネイト等の可視カツト樹脂で成形
したコ字状の密閉ケース6、発光素子としての発
光ダイオード7、受光素子としてのフオトトラン
ジスタ8、これら発光ダイオード7、フオトトラ
ンジスタ8を固定する取付板9、取付板9をケー
ス6内に封止する封止樹脂10から構成されてい
る。前記ケース6は前記両素子7,8を収納する
一対の収納部6aと前記両素子を固定した取付板
9を配置する固定部6bより成る。第3図にケー
ス6の光透過特性の一例を示す。この図でAはケ
ース6の成形樹脂として厚さ1mmの透明ナイロン
を用いた場合の透過特性、Bは厚さ1mmのポリカ
ーボネイトを用いた場合の光透過特性である。ま
た第4図は発光ダイオードの分光分布とフオトト
ランジスタの分光感度分布の一例を示している。 In Figures 1 and 2, 1 is an evaporator of a refrigerator or other refrigerator, 2 is a pipe through which refrigerant passes, and 3
is a fin plate arranged perpendicular to this pipe 2, 4 is a frost detection hole provided in the fin plate 3,
Reference numeral 5 denotes frost detection devices that are provided facing each other through the frost detection hole 4. The frost detection device 5
A U-shaped sealed case 6 made of a visible cut resin such as polycarbonate that blocks visible light and preferentially transmits only light emitting element light, a light emitting diode 7 as a light emitting element, and a phototransistor 8 as a light receiving element. It is composed of a mounting plate 9 for fixing the light emitting diode 7 and the phototransistor 8, and a sealing resin 10 for sealing the mounting plate 9 inside the case 6. The case 6 consists of a pair of storage parts 6a for storing both the elements 7 and 8, and a fixing part 6b for arranging a mounting plate 9 to which both the elements are fixed. FIG. 3 shows an example of the light transmission characteristics of the case 6. In this figure, A is the transmission characteristic when 1 mm thick transparent nylon is used as the molding resin for the case 6, and B is the light transmission characteristic when 1 mm thick polycarbonate is used. Further, FIG. 4 shows an example of the spectral distribution of a light emitting diode and the spectral sensitivity distribution of a phototransistor.
すなわち、このグラフから明らかなように、透
明ナイロンAでは発光ダイオード7の分光分布よ
り広範囲の波長の光を透過してしまうが、ポリカ
ーボネイトBでは透過する光の波長が制限され、
発光ダイオード7の分光分布に近似した波長の光
しか透過させない。つまり可視光領域の波長の光
を透過させないことで光に対する感知精度が非常
に向上するものである。よつて、上記構成におい
て、霜検出装置5のケース6に可視カツト樹脂を
使用しているため、可視光は殆んど遮蔽して発光
ダイオード7の光のみを優先的に透過させるの
で、発光ダイオード7とフオトトランジスタ8間
で外乱光の影響を受けずに光の授受が可能にな
る。そして従来のようにハウジングケースに光を
透過させる開口部を必要としないので外部雰囲気
としや断した完全密閉構造が可能になつた。 That is, as is clear from this graph, transparent nylon A transmits light with a wider range of wavelengths than the spectral distribution of the light emitting diode 7, but polycarbonate B limits the wavelength of light that can be transmitted.
Only light having a wavelength close to the spectral distribution of the light emitting diode 7 is transmitted. In other words, by not transmitting light with wavelengths in the visible light range, the accuracy of light sensing is greatly improved. Therefore, in the above configuration, since visible cut resin is used for the case 6 of the frost detection device 5, most of the visible light is blocked and only the light from the light emitting diode 7 is preferentially transmitted. Light can be exchanged between the phototransistor 7 and the phototransistor 8 without being affected by disturbance light. Since there is no need for an opening in the housing case that allows light to pass through, unlike in the past, it has become possible to create a completely sealed structure that is cut off from the external atmosphere.
上記内容をさらにまとめると、外乱光の影響を
受けないことから、霜検知孔4が霜で閉じて発光
ダイオード7からの光が遮蔽されているにもかか
わらずフオトトランジスタ8が外乱光を感知して
着霜検知に至らないというような状態は生じな
い。また霜検出装置の使用周囲条件は、除霜時に
は高温多湿であり冷却運転時には極めて低温とな
る過酷な条件であるが、前述の如くケースが完全
密閉構造となつているので水分の影響は受けず耐
冷熱サイクル性も向上する。 To further summarize the above, since it is not affected by ambient light, the phototransistor 8 senses the ambient light even though the frost detection hole 4 is closed by frost and the light from the light emitting diode 7 is blocked. There is no such situation where frost formation is not detected. In addition, the surrounding conditions in which the frost detection device is used are harsh, with high temperature and humidity during defrosting and extremely low temperatures during cooling operation, but as mentioned above, the case is completely sealed, so it is not affected by moisture. Cold and heat cycle resistance is also improved.
以上の説明からも明らかなように、本発明の霜
検出装置は蒸発器に設けた霜検知孔に相対向して
発光ダイオード等の発光素子とホトトランジスタ
等の受光素子を配置し、前記両素子収納する一対
の収納部と前記両素子を固定した取付板を配置す
る固定部より成る密閉ケースを前記発光素子の光
を透過する可視光カツト合成樹脂にて一体に形成
したものであるから、耐水耐湿性、耐冷熱サイク
ル性が向上し外乱光による誤動作も生じないとい
う優れた効果がある。 As is clear from the above description, the frost detection device of the present invention has a light emitting element such as a light emitting diode and a light receiving element such as a phototransistor arranged opposite to a frost detection hole provided in an evaporator, and both of the elements The sealed case, which consists of a pair of storage parts for storing the elements and a fixing part for arranging the mounting plate to which both the elements are fixed, is integrally formed of a visible light cut synthetic resin that transmits the light from the light emitting element, so it is water resistant. It has the excellent effect of improving moisture resistance and cold/heat cycle resistance, and preventing malfunctions caused by ambient light.
第1図は本発明一実施例の霜検出装置を有する
蒸発器一部の平面図、第2図は同装置の斜視図、
第3図はケースの光透過特性図、第4図は発光ダ
イオードおよびフオトトランジスタの分光分布図
である。
4……霜検知孔、7……発光ダイオード発光素
子、8……フオトトランジスタ受光素子、6……
ケース、6a……収納部、6b……固定部、9…
…取付板。
FIG. 1 is a plan view of a part of an evaporator having a frost detection device according to an embodiment of the present invention, and FIG. 2 is a perspective view of the same device.
FIG. 3 is a light transmission characteristic diagram of the case, and FIG. 4 is a spectral distribution diagram of the light emitting diode and phototransistor. 4...Frost detection hole, 7...Light emitting diode light emitting element, 8...Phototransistor light receiving element, 6...
Case, 6a... Storage section, 6b... Fixed section, 9...
...Mounting plate.
Claims (1)
た発光素子及び受光素子と、前記両素子を密閉状
態に収納する一対の収納部と前記両素子を固定し
た取付板を配置する固定部より成る密閉ケースと
を備え、前記密閉ケースは前記発光素子の分光分
布と近似した光透過特性を有する可視光カツト合
成樹脂にて形成した霜検出装置。1. A light-emitting element and a light-receiving element arranged opposite to each other in a frost detection hole provided in the evaporator, a pair of storage parts for storing the two elements in a sealed state, and a fixing part for arranging the mounting plate to which the two elements are fixed. 1. A frost detection device comprising: a sealed case made of a visible light-cutting synthetic resin having light transmission characteristics similar to the spectral distribution of the light emitting element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56187636A JPS5888687A (en) | 1981-11-20 | 1981-11-20 | Frost detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56187636A JPS5888687A (en) | 1981-11-20 | 1981-11-20 | Frost detector |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5888687A JPS5888687A (en) | 1983-05-26 |
JPH0130438B2 true JPH0130438B2 (en) | 1989-06-20 |
Family
ID=16209575
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56187636A Granted JPS5888687A (en) | 1981-11-20 | 1981-11-20 | Frost detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5888687A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04171869A (en) * | 1990-11-05 | 1992-06-19 | Toshiba Corp | Object detector |
JP4767053B2 (en) * | 2006-03-24 | 2011-09-07 | 三菱電機株式会社 | Refrigeration air conditioner |
JP5874276B2 (en) * | 2011-09-29 | 2016-03-02 | セイコーエプソン株式会社 | Cartridge, printing device |
KR102387389B1 (en) * | 2021-09-15 | 2022-04-15 | 아브라텍 주식회사 | Auto defrosting apparatus for removing frost of refrigerator |
-
1981
- 1981-11-20 JP JP56187636A patent/JPS5888687A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS5888687A (en) | 1983-05-26 |
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