バックランプのＬＥＤ化（その１１）－３Ｗ ＬＥＤのヒートシンクを加工② ― 2010/06/15 22:23
いろいろと試してみると、案外簡単な方法が見つかるものです。
手間と時間と、忍耐力が必要と思われたヒートシンクの加工ですが、思ったよりも簡単に済みました。
済んだといっても、”だいたいの加工が済んだ”ということで、もう少しづつ削って調整しないと、２０ｍｍには収まりません。
しかし、最終調整をする前に、放熱の具合を見て（感じて）おきたくなります。
ＬＥＤに着けると、こんな感じです。
手間と時間と、忍耐力が必要と思われたヒートシンクの加工ですが、思ったよりも簡単に済みました。
済んだといっても、”だいたいの加工が済んだ”ということで、もう少しづつ削って調整しないと、２０ｍｍには収まりません。
しかし、最終調整をする前に、放熱の具合を見て（感じて）おきたくなります。
ＬＥＤに着けると、こんな感じです。
だいぶ小さくなりました。
見るからに、放熱し無さそうです。
そして、前回同様、ヒートシンクの熱さを感じてみました。
（点灯後の時間[分:秒]、カッコの時間は加工前の結果)見るからに、放熱し無さそうです。
そして、前回同様、ヒートシンクの熱さを感じてみました。
0:45(1:30) 裏側中央がほんのり暖かくなる
1:10(3:00)
放射状の先端部もほんのり暖かくなる
1:30(2:00) 裏側中央が熱くなる（触れない程ではない）
2:00(4:00) 放射状の先端部も熱くなる（触れる）1:30(2:00) 裏側中央が熱くなる（触れない程ではない）
2:15(7:00) 全体的に更に熱さが増している
（終了）
かなり、”感覚的”な話ですが、だいぶ時間が短くなっていることが分かります。
注目すべき点が一つ。
上記の測定点の２番目と３番目が、加工前と加工後で入れ替わっていることです。
加工前は、放射状の「羽」が長かったので、まず裏側中央が熱くなってから、羽の先端へ熱が伝わっています。これは、羽の途中でかなり放熱しているといえます。
逆に、加工後では、羽の先端に熱が伝わってから、裏側中央が熱くなっています。羽が短いので、先端まで速く熱が伝わり、且つ、放熱が足りていないといえます。
加工前、７分で終了していますが、まだ余裕がある感じだったのに対し、加工後に終了した２分１５秒では、あまり余裕が感じられませんでした。
加工前が１０分を謳うならば、加工後は２分３０秒といったところでしょうか。
あくまでも、加工前との相対的な変化を、感覚的に判断した主観的な結果であって、科学的、論理的な根拠は一切ありません。
一言で言うと、「勘」というやつです。
目標の３分には、ちょっと届かない感じですが、どうしても使えないという程では無さそうなので、引き続き、加工をして、車に装着できるようにしてみましょう。
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