JP3794399B2 - Information processing equipment for divers - Google Patents

Description

ここで、ｋは実験的に求められる定数である。
【００４７】
次に比較部６６により、呼吸気窒素分圧記憶部６３の結果であるＰＩＮ２（ｔ）と体内窒素分圧部５の結果であるＰＧＴ（ｔ）を比較し、その結果、半飽和時間選択部６７によって、体内窒素分圧計算部６４で用いられる半飽和時間ＴＨを可変とする。
たとえば、ｔ＝ｔ０時の呼吸気窒素分圧ＰＩＮ２（ｔ０）、体内窒素分圧ＰＧＴ（ｔ０）が、それぞれ呼吸気窒素分圧記憶部６３と体内窒素分圧記憶部６５に記憶されているとすると、比較部６６はこのＰＩＮ２（ｔ０）とＰＧＴ（ｔ０）を比較する。
【００４８】
そして、体内窒素分圧計算部６４は、半飽和時間選択部６７により、次のように制御され、ｔ＝ｔＥの時の体内窒素分圧ＰＧＴ（ｔＥ）が計算される。
【００４９】

ここで、上記２式では、ｋは定数、ＴＨ２＜ＴＨ１と計算される。
【００５０】
なお、ＰＧＴ（ｔ０）＝ＰＩＮ２（ｔ０）のときは、半飽和時間ＴＨ＝（ＴＨ２＋ＴＨ１）／２として計算するのが好ましい。また、これらの時間（ｔ０や、ｔＥについての計測）は、図３の計時部６８によって管理される。
ここでＰＧＴ（ｔ０）＞ＰＩＮ２（ｔ０）のときは、体内から窒素が排出される場合であり、ＰＧＴ（ｔ０）＜ＰＩＮ２（ｔ０）のときは、体内へ窒素が吸収される場合である。これらの時に半飽和時間を可変するということは、窒素が排出される場合は、半飽和時間が長く、排出に時間がかかることを意味し、逆に窒素が吸収される場合は半飽和時間が短く、呼吸にかかる時間は排出にかかる時間と比較すると短いことになる。このようにすれば、体内窒素量のシミュレーションをより厳密に行うことができるので、体内窒素量の上限値を設定すれば、現在の体内窒素量からみて無減圧潜水可能な時間や水面に上がった以降、体内窒素量が通常の状態に戻るまでの時間などを求めることができる。それ故、これらの情報をダイバーに報知すれば、潜水の安全性を高めることができる。
【００５１】
［各モードの説明］
このように構成した情報処理装置１は、図５を参照して以下に説明する各モード（時刻モードＳＴ１、サーフェスモードＳＴ２，プランニングモードＳＴ３、設定モードＳＴ４，ダイビングモードＳＴ５，ログモードＳＴ６）での使用が可能である。なお、図５には、液晶表示パネル１１の表示領域のうち、表示領域１１Ａに表示される項目のみを表してある。
【００５２】
（時刻モードＳＴ１ ）
時刻モードＳＴ１は、スイッチ操作を行わず、かつ、体内窒素が平衡状態時、陸上で携帯するときの機能であり、液晶表示パネル１１には現在月日１００，現在時刻１０１、高度ランク１０２（図１を参照。／高度ランクがランクの０の場合にはマークが表示されない。）が表示される。高度ランク１０２は、現在の場所の高度を自動的に計測し、３つのランクで表示するようになっている。現在時刻１０１はコロンが点滅することによって、この表示が現在時刻１０１である旨を知らせる。たとえば、図５、６に示す状態では、現在１２月５日の１０時０６分であると表示されている。
【００５３】
また、海抜の高い所、低い所を上下したときも気圧が変化し、過去のダイビングの有無にかかわらず、体内への窒素の溶け込みや窒素の排出が起きる。そこで、本形態の情報処理装置１では、時刻モードＳＴ１であってもこのような高度変化があったときには減圧計算を自動的に開始し、表示が変わる。すなわち、図示を省略するが、高度が変わってからの時間、体内窒素が平衡状態になるまでの時間、現在から平衡状態になるまで排出または溶け込む窒素量が表示される。
【００５４】
この時刻モードＳＴ１では、スイッチＡを押すとプランニングモードＳＴ３に直接、移行し、スイッチＢを押すとログモードＳＴ６に直接、移行する。また、スイッチＡを押した後、スイッチＡを押したままスイッチＢを５秒間押し続けると、設定モードＳＴ４に移行する。
【００５５】
（サーフェスモードＳＴ２）
情報処理装置１は、ダイビングの終了後、導通していた潜水動作監視スイッチ３０が絶縁状態になると自動的にサーフェスモードＳＴ２に移行する。このサーフェスモードＳＴ２は、前回のダイビングから４８時間経過するまで、陸上で携帯するときの機能である。このサーフェスモードＳＴ２では、時刻モードＳＴ１で表示するデータは図６にあるように（現在月日１００，現在時刻１０１，高度ランク）の他に、ダイビング終了後の体内窒素量の変化の目安などを表示する。すなわち、体内に溶け込んだ過剰な窒素が排出され、平衡状態になるまでの時間が体内窒素排出時間２０１として表示される。この体内窒素排出時間２０１は、平衡状態になるまでの時間をカウントダウンする。体内窒素排出時間２０１が０時間００分になった以降は、無表示となる。また、潜水後の経過時間が水面休止時間２０２として表示され、この水面休止時間２０２は、ダイビングモードＳＴ５において水深が１．５ｍよりも浅くなった時点をダイビングの終了として計時が開始され、４８時間まで計測した後、無表示となる。従って、情報処理装置１において、ダイビング終了後、４８時間が経過するまではは陸上においてこのサーフェスモードＳＴ２となり、それ以降は時刻モードＳＴ１である。なお、図５に示す状態では、現在、１２月５日の１１時５８分であり、ダイビング終了後、１時間１３分経過していると表示されている。また、これまで行ったダイビングにより体内に溶け込んだ窒素量が体内窒素グラフ２０３の４個分に相当することが表示され、この状態から体内の過剰な窒素が排出されて平衡状態になるまでの時間（体内窒素排出時間２０１）が、たとえば１０時間５５分であると表示されている。
【００５６】
このサーフェスモードＳＴ２では、スイッチＡを押すとプランニングモードＳＴ３に直接移行し、スイッチＢを押すとログモードＳＴ６に直接移行する。また、スイッチ押した後、スイッチＡを押したままスイッチＢを５秒間押し続けると、設定モードＳＴ４に移行する。
【００５７】
（プランニングモードＳＴ３）
プランニングモードＳＴ３では、次に行うダイビングの最大水深と潜水時間の目安を入力することが可能なモードである。このモードでは、図７に示すように、水深ランク３０１，無減圧潜水可能時間３０２、セーフティレベル、高度ランク、水面休止時間２０２、体内窒素グラフ２０３が表示される。水深ランク３０１のランクは、低ランクから高ランクへと順次、表示が変わっていくとともに、各水深ランク３０１は、９ｍ、１２ｍ、１５ｍ、１８ｍ、２１ｍ、２４ｍ、２７ｍ、３０ｍ、３３ｍ、３６ｍ、３９ｍ、４２ｍ、４５ｍ、４８ｍの順に５ 秒毎に切り変わる。このとき、時刻モードＳＴ１からプランニングモードＳＴ３に移行したのであれば、過去の潜水によって体内に過剰な窒素蓄積がない初回潜水の計画であるため、体内窒素グラフ２０３ が０ であり、水深が１５ｍ のときに無減圧潜水可能時間３０２が６６分と表示される。それ故、水深１２ｍ以上、１５ｍ以下のところで６６ 分未満まで無減圧潜水が可能であることがわかる。これに対して、サーフェスモードＳＴ２からプランニングモードＳＴ３に移行したのであれば、過去の潜水によって体内に過剰の窒素蓄積がある反復潜水の計画であるため、体内窒素グラフ２０３が４つ分であり、最大水深が１５ｍのときであれば、無減圧潜水可能時間３０２は４９分と表示される。それ故、水深１２ｍ以上、１５ｍ以下のところで４９分未満まで無減圧潜水が可能であることがわかる。
【００５８】
このプランニングモードＳＴ３では、水深ランク３０１が４８ｍと表示されるまでの間にスイッチＡを２秒以上押し続けると、サーフェスモードＳＴ２に直接、移行する。また、水深ランク３０１が４８ｍと表示された後には、時刻モードＳＴ１またはサーフェスモードＳＴ２に自動的に移行する。さらに、所定の期間スイッチ操作がないときにはサーフェスモードＳＴ２または時刻モードＳＴ１に自動的に移行するので、その都度スイッチ操作を行う必要がない分、便利である。これに対してスイッチＢ を押すとログモードＳＴ６に直接移行する。
【００５９】
（設定モードＳＴ４）
設定モードＳＴ４は、図８に示すように月日１００，現在時刻１０１の設定の他に、警告アラームのＯＮ／ＯＦＦ設定、セーフティレベルの設定をも行うための機能である。この設定モードＳＴ４では、現在月日１００，年１０６，現在時刻１０１，セーフティレベル（図示せず）、アラームのＯＮ／ＯＦＦ （図示せず）、高度ランクが表示され、これらの項目のうち、セーフティレベルは、通常の減圧計算を行うレベルと、ダイビング後に１ ランク高い高度ランクの場所へ移動することを前提とした減圧計算を行うレベルの２つのレベルに設定できる。アラームのＯＮ／ＯＦＦは、報音装置３７から各種警告のアラームを鳴らすか否かを設定するための設定であり、アラームをＯＦＦに設定しておけば、アラームが鳴らない。従ってダイバーズ用情報処理装置１のように電池切れが特に致命的である装置では、アラームのために消費される電力を削除でき、都合がよい。
【００６０】
この設定モードＳＴ４では、スイッチＡ を押す度に設定項目が時、秒、分、年、月、日、セーフティレベル、アラームＯＮ／ＯＦＦの順に切り替わり、それに相当する部分の表示が点滅する。このとき、スイッチＢ を押すと設定項目の数値または文字が変わり、押し続けると数値や文字が早く変わる。アラームのＯＮ／ＯＦＦが点滅しているときにスイッチＡを押すと、サーフェスモードＳＴ２または時刻モードＳＴ１に戻る。また、スイッチＡ、Ｂのいずれもが１分〜２分間押さなければ、サーフェスモードＳＴ２または時刻モードＳＴ１に自動的に戻る。
【００６１】
（ログモードＳＴ６）
時刻モードＳＴ１またはサーフェスモードＳＴ２ においてスイッチＢを押すと、ログモードＳＴ６に直接移行する。ログモードＳＴ６は、３分以上、ダイビングモードＳＴ５ に入った状態で水深１．５ｍよりも深く潜水したときの各種データを記憶、表示する機能である。このようなダイビングのデータは、ログデータとして潜水毎に順次記憶され、最大１０本のログデータが記憶、保持され、それ以上潜水した場合には古いデータから順に削除され、常に最新の１０本分のダイビングが記憶される。
このログモードＳＴ６において、ログデータは４秒毎に切り替わる２つの画面で表示される。図１０に示すように、第１の画面ＳＴ６１では、潜水月日６０１，平均水深５０９，潜水開始時刻６０３，潜水終了時刻６０４，高度ランク、潜水を終了したときの体内窒素グラフ２０３が表示される。第２の画面ＳＴ６２では、その日での潜水ナンバーであるログナンバー６０５，最大水深６０８，潜水時間６０６，最大水深時の水温６０７，高度ランク、潜水を終了したときの体内窒素グラフ２０３が表示される。たとえば、図１０に示す状態では、高度ランクが０のところで、１２月５日の２本目のダイビングは潜水が１０時０７分に開始された以降、１０時４５分で終了し、３８分間の潜水であった旨が表示されている。このときのダイビングでは、平均水深が１４．６ｍ、最大水深が２６．０ｍ、最大水深時の水温が２３℃であり、ダイビング終了後、体内窒素グラフ２０３が４つ分の窒素が体内に溶け込んだ旨を表示している。このように、ログモードＳＴ６では２画面を自動的に切り換えながら各種の情報を表示するので、表示面が小さくても表示できる情報量が多い。
【００６２】
さらに、ログモードＳＴ６では、今回表示しているダイビング中に前記の速度違反警告が２回以上あったときには、その旨を、たとえば液晶表示パネル１１の第７の表示領域１１７において「ＳＬＯＷ」と表示する。
このログモードＳＴ６では、スイッチＢ を押す度に、新しいデータから占いデータに切り換わり、最も占いデータが表示された後は、時刻モードＳＴ１またはサーフェスモードＳＴ２に移行する。その途中にスイッチＢを２秒以上押し続けた場合も時刻モードＳＴ１またはサーフェスモードＳＴ２に移行する。さらに、スイッチＡ，Ｂのいずれもが１分〜２分間押されない場合も、サーフェスモードＳＴ２または時刻モードＳＴ１に自動的に戻るので、その都度、スイッチ操作を行う必要がない分、便利である。これに対してスイッチＡを押すと、プランニングモードＳＴ３に直接移行する。
【００６３】
（ダイビングモードＳＴ５）
ダイビングモードＳＴ５とは、潜水時のモードであり、図９に示すように、無減圧潜水モードＳＴ５１では、現在水深５０１，潜水時間５０２，最大水深５０３，無減圧潜水可能時間３０２，体内窒素グラフ２０３，高度ランクなど、ダイビングに必要な情報が表示される機能である。たとえば、図５に示す状態では、ダイビングを開始してから１２分経過し、水深が１６．８ｍのところにおり、この水深ではあと４２分間無減圧潜水を続けることができる旨が表示されている。また、現在までの最大水深は２０．０ｍである旨が表示され、さらに現在の体内窒素量は体内窒素グラフ２０３のマークが４つ点灯しているレベルである旨が表示される。
このダイビングモードＳＴ５では、圧力減少率監視機能として前記したとおり、急激な浮上は減圧症や肺の過膨張傷害の原因となることから、常に圧力減少率導出部７５１によって現在の圧力減少率を求め、その圧力減少率がダイバーが把握できるように圧力減少率報知部７７１によってダイバーに伝達される。
【００６４】
ここで、圧力減少率とは
圧力減少率＝（Ｐ（ｔ）−Ｐ（０））／ｔ・・・・・・式（１）
の式で表され、Ｐ（０）は現時点での圧力値、Ｐ（ｔ）はｔ秒（分）前の圧力値、ｔは圧力が変化するためにかかった時間を表す。
【００６５】
この式の圧力値とは気圧と水圧の和である絶対圧である。図３に示すように、水面の気圧情報を圧力計測部６１によって直接計測するか、もしくは気圧情報を操作部５によって入力し、水面の気圧情報を得た後に、その気圧に応じ圧力減少率上限値設定部７６によって圧力減少率上限値が選択され、設定される。一方、圧力減少率上限値の設定に、現在の圧力値より単位時間あたりの圧力変化率を用いれば、気圧毎の圧力減少率上限値の設定が省略でき、処理を簡略化できる。ここで圧力変化率とは、
圧力変化率＝Ｐ（ｔ）／Ｐ（０）・・・・・・式（２）
の式で表され、ここで、Ｐ（ｔ）はｔ秒（分）後の圧力値で、Ｐ（０）は現在の圧力値である。例えば、１分あたりの圧力変化率が０．５倍以下にならないように設定しておけば、常に気圧情報や水深情報を考慮することなく、１分以内に現在の圧力Ｐ（０）の半分の値にならないように圧力減少率上限値を設定すればよい。このことは要するに、圧力値が半分に減らないようにするということは逆に言えば、体内の空気の膨張が２ 倍にならないようにすることと同じことである。また、そもそもダイビング中に急な浮上を行わせないようにする予防が重要であり、現実的にはある危険な圧力減少率上限値を超えてしまってからでは遅い場合もある。そこで、ｔ秒（分）後の圧力減少率を予測するために以下の式を用いる。
【００６６】
ｄＰ（ｔ）＝ｄＰ（０）＋（ｄＰ（０）−ｄＰ（ｔ‘））／ｔ’×ｔ
ここで、ｄｐ（ｔ）はｔ秒（分）後の圧力減少率、ｄＰ（０）は現在の圧力減少率、ｄＰ（ｔ‘）はｔ’秒（分）前の圧力減少率である。これによってｔ秒（分）後の圧力減少率を予測することができる。また、この式を変形し、現時点の圧力減少率の変化率から、圧力減少率上限値を越えるまでの時間を算出することも可能である。その式は、
ｔ＝（ｄＰｍａｘ−ｄＰ（０））×ｔ‘／（ｄＰ（０）−ｄＰ（ｔ’））
であり、ここで、ｄＰ_ｍａｘは圧力減少率上限値、ｄＰ（０）は現在の圧力減少率、ｄｐ（ｔ‘）はｔ’秒（分）前の圧力減少率である。
【００６７】
また、ダイビング協会の１つＮＡＵＩ（Ｎａｔｉｏｎａｌ Ａｓｓｏｃｉａｔｉｏｎ ｏｆ Ｕｎｄｅｒｗａｔｅｒ Ｉｎｓｔｒｕｃｔｏｒｓ）では、浮上速度は絶対に１分あたり１８ｍを超えてはならないと指導おり、さらに安全を考慮すればできるだけ１分あたり１０ｍを越えないスピードで浮上するように指導している。この浮上速度を例に考えてみると、たとえば高度３２００ｍの高所潜水を考えた場合、水面の気圧は以下の式で算出され、
Ｐ（０）＝１０×ｅｘｐ（−Ｈ／８０００）
ここで、水面の気圧Ｐ（０）、水面の高度Ｈであり、ここでＨ＝３２００を代入し、具体的に水面の気圧を算出すると６．７ｍｓｗ となり、通常海抜０ｍの地点でダイビングを行うときは水面の気圧が１０ｍｓｗとなるため、３．３ｍｓｗほど３２００ｍの高地では気圧が低くなる。ここで、圧力の単位はｍｓｗを用いているが、ダイビングでは、海水のメートルが圧力の度量衡単位になることが多い。
【００６８】
さて、海抜０ｍ地点でダイビングを行った場合、仮に水深１０ｍから水面まで１分間に浮上してきた場合、その圧力減少率は式（１）より（２０−１０）／１＝１０ｍｓｗ／ｍｉｎで、その圧力変化率は式（２）より１０／（１０＋１０）＝０．５倍に減少する。一方、標高３２００ｍ地点で、この圧力変化率０．５と同等の変化率で水面まで浮上を行う場合は、１分間の間に深さ６．７ｍ（圧力値は１３．４ｍｓｗから水面（圧力値は６．７ｍｓｗ）までの浮上となる。すなわち、海抜０ｍ地点で１分あたりの圧力減少率上限値が１０ｍだったものが、標高３２００ｍでは６．７ｍになり、厳しい値となる。ダイビングを行うポイントの標高をある一定間隔ごとに分類し、そのときの圧力減少率上限値をまとめると一例として以下のようになる。
【００６９】
標高 圧力減少率上限値
０ｍ １０．０ｍｓｗ／分
０〜８００ｍ ９．０５ｍｓｗ／分
８００〜１６００ｍ ８．１９ｍｓｗ／分
１６００〜２４００ｍ ７．４１ｍｓｗ／分
２４００〜３２００ｍ ６．７０ｍｓｗ／分
このように圧力計測部６１もしくは操作部５によって得られた気圧情報に基づき、圧力減少率上限値設定部７６によって圧力減少率上限値が設定される。
【００７０】
ここで、この圧力減少率上限値を超えないようにダイバーに知らせるために、以下のようにアラームの鳴鐘周波数を変えたり、振動アラームと組み合わせてもよい。以下は１例として、２４００ｍ〜３２００ｍの高所ダイビングを行うときの設定である。
【００７１】
圧力減少率（ｍｓｗ／分） アラーム音周波数（Ｈｚ）
４．７〜５．７ ５００
５．７〜６．７ １０００
６．７〜７．７ １５００（振動アラームＯＮ）
７．７〜９．７ ２０００
９．７〜 ４０００
本実施例では気圧に応じた圧力減少率上限値の定義をおこなっているが、さらには水深を考慮し、各気圧毎の各水深毎の圧力減少率上限値を設定してもよい。また、この設定条件が増えてくると複雑になるため、圧力変化率を設定しておき、この圧力変化率より圧力減少率上限値を設定してもよい。これならば、水面の気圧情報や水深の情報ごとの圧力減少率上限値をあらかじめ設定しておく必要がなく、処理が簡素化できる。
また、圧力減少率の変化は表示によってもダイバーに伝達され、図１の表示部１１８で圧力減少率が表示される。これによって仮に複数のダイバーが同一のダイバーズ用情報処理装置を使用していて、同様な浮上を行い、複数のダイバーズ用情報処理装置で鳴鐘があった場合の混乱を避けることができる。
【００７２】
なお、ダイビングモードＳＴ５では、スイッチＡを押すと、それが押し続けられている間だけ、現在時刻表示モードＳＴ５２として、現在時刻１０１と現在水温５０４が表示される。図９に示す状態では、現在、時刻が１０時１８分であり、水温が２３℃であると表示されている。このように、ダイビングモードＳＴ５においてその旨のスイッチ操作があったときには所定の期間だけ現在時刻１０１や現在水温の表示を行うため、小さな表示面内で常時はダイビングに必要なデータだけを表示するように構成したとしても（無減圧潜水モードＳＴ５１）、現在時刻１０１などを必要に応じて表示できるので（現在時刻表示モードＳＴ５２）、便利である。しかも、このようにダイビングモードＳＴ５においても、表示の切り換えにスイッチ操作を用いたので、ダイバーが知りたい情報を適正なタイミングで表示できる。
【００７３】
このダイビングモードＳＴ５の間に、水深が１．５ｍより浅いところにまで浮上したときには、ダイビングが終了したものとして処理され、導通していた潜水動作監視スイッチ３０が絶縁状態になった時点でサーフェスモードＳＴ２に自動的に移行する。この間、図３に示した潜水結果記録部７８は、水深が１．５ｍ以深になったときから１．５ｍ以浅になったときまでを１回の潜水動作としてこの間の潜水結果（ダイビングの日付、潜水時間、最大水深などの様々なデータ）をＲＡＭ５４に記憶、保持しておく。併せて、今回のダイビング中に前記の圧力減少率違反警告が連続して２回以上あったときには、その旨も潜水結果として記録する。
本形態の情報処理装置１は、あくまで無減圧潜水を前提に構成されているものであるが、万が一、減圧潜水の状態になったときには、その旨のアラーム音でダイバーに報知するとともに、以下の減圧潜水表示モードＳＴ５３に切り変わる。
【００７４】
すなわち、減圧潜水表示モードＳＴ５３では、現在水深５０１，潜水時間５０２，体内窒素グラフ２０３，高度ランク、減圧停止深度５０５、減圧停止時間５０６、総浮上時間５０７が表示される。図９に示す状態では、潜水開始から２４分経過し、水深が２９．５ｍのところにいる旨が表示されている。また、体内窒素量が最大許容値を越え、危険であるため、安全な圧力減少率を守りながら、水深３ｍの所まで浮上し、そこで１ 分間の減圧停止をするようにとの指示が表示される。また、安全な圧力減少率として水面までには最低でも５ 分かけるようにとの指示が表示される。さらに、現在、体内窒素量が増大傾向にある旨が上向きの矢印で表示される。そこで、ダイバーは上記の表示内容に基づいて減圧停止した後、浮上するが、この減圧を行っている間、体内窒素量が減少傾向にある旨が下向きの矢印５０９で表示される。産業上の利用可能性本発明のダイバーズ用情報処理装置は、ダイバーが浮上時に、危険な圧力減少率にならないように、現在の圧力減少率を確認、警告および予測する手段を備え、低所潜水と同じ浮上速度でも圧力変化率の大きくなる高所潜水などにおけるダイバーの減圧症および肺の過膨張傷害にかかる危険性を低減させることができる。
【図面の簡単な説明】
【図１】 本発明を適用したダイバーズ用情報処理装置の装置本体、および腕バンドの一部を示す平面図である。
【図２】 本発明を適用したダイバーズ用情報処理装置の全体ブロック図である。
【図３】 本発明を適用したダイバーズ用情報処理装置において、圧力減少率違反警告を行うためのブロック図である。
【図４】 本発明を適用したダイバーズ用情報処理装置において、体内窒素量を計算するためのブロック図である。
【図５】 本発明を適用したダイバーズ用情報処理装置が有する各機能を示すフローチャートである。
【図６】 タイムモードおよびサーフェスモードの表示に関する説明図である。
【図７】 プランモードの表示に関する説明図である。
【図８】 設定モードの表示に関する説明図である。
【図９】 ダイブモードの表示に関する説明図である。
【図１０】 ログモードの表示に関する説明図である。
【図１１】 報音装置の説明図である。
【図１２】 振動発生装置の説明図である。
【図１３】 振動発生装置の動作説明図である。
【図１４】 振動発生装置のステータに関する説明図である。[0001]
【Technical field】
The present invention relates to an information processing apparatus for divers, and in particular, notifies the diver of the pressure decrease rate when the diver ascends during diving, and diving divers' decompression sickness and lung overload at high places where the rate of pressure change tends to be large. It relates to reducing the risk of inflating injury.
[0002]
[Background]
For a calculation method of decompression conditions after diving performed in an information processing apparatus for divers also called a so-called dive computer, see KEN LOYST et al. "DIVE COMPUTERS A CONSUMER'S GUIDE TO HISTORY, THEORY & PERFORMANCE '" by Watersports Publishing Inc. (1991). The literature on the theory includes A. A. "Decompression-Decompression Sickness" by Buhlmann, Springer, Berlin (1984), pp. The calculation method described in 14 is also studied.
[0003]
Therefore, in the information processing device for divers, the absorption and discharge of inert gas in the body during and after diving is calculated based on the above theory, the amount of inert gas in the body is constantly grasped, and the risk of divers' decompression sickness can be determined. Reduced.
[0004]
Also, from the viewpoint of preventing decompression sickness, if the ascent rate is too fast, inert gas such as nitrogen dissolved in the body will become bubbles and cause decompression sickness, so it is also possible to protect the ascent rate to the water surface. is important. Therefore, in the conventional information processing apparatus for divers, the ascent speed is monitored, and when the ascent speed is higher than one preset ascent speed upper limit value, a warning that the ascent speed is violated is issued to inform the diver. Some are configured.
[0005]
The ascent rate is not the change in the water pressure value at the time of ascent, but the magnitude of the water pressure ratio before and after the ascent in the unit time, and the ascent rate is set according to the water depth and the ascent rate is monitored. There is also an information processing device for divers.
[0006]
However, they have a problem that no consideration is given to the atmospheric pressure of the water surface where diving is performed. For example, if you dive in a high place with a low pressure on the surface of the water and if you dive in a low place with a high pressure on the surface of the water, However, the pressure change rate obtained by dividing the pressure after the movement by the pressure before the start of movement is smaller when diving at a high place, and conversely, the air in the lung is in inverse proportion to the pressure change rate and expands more than the low place diving. The risk of decompression sickness and lung hyperinflation injury is great.
[0007]
However, some of the conventional divers' information processing devices were set with the upper limit of the ascent rate for ascent according to the water depth. The value was set and no consideration was given to the water pressure. Therefore, from the viewpoint of emphasizing safety, the upper limit of the ascent rate is set to be considerably small. As a result, in diving in a low place where the water pressure is high, a warning that the ascent rate is violated is frequently issued even though there is a surplus in the ascent rate, and information deviating from the current state is provided. On the other hand, if the upper limit of the ascent rate is set to a large value to prevent the warning from being issued erroneously, it is difficult to reliably prevent decompression sickness.
[0008]
In view of the above problems, in the present invention, the upper limit of the pressure decrease rate at the time of ascent is set based on the atmospheric pressure of the water surface where diving is performed, and the appropriate ascent is also achieved in diving at a high place where the air pressure is low. An object of the present invention is to provide an information processing apparatus for divers capable of monitoring speed.
[0009]
DISCLOSURE OF THE INVENTION
In order to achieve the above object, an information processing apparatus for divers according to the present invention comprises a pressure measuring means for measuring water depth and atmospheric pressure, a diving time timing means for measuring diving time, and a pressure measured by the pressure measuring means. The pressure reduction rate deriving means for deriving the pressure reduction rate during ascent based on the time measuring means, the pressure reduction rate upper limit setting means for setting the pressure reduction rate upper limit value, and the pressure upper limit value setting means. A pressure reduction rate comparison means for comparing the pressure reduction rate upper limit value and the current pressure reduction rate derived by the pressure reduction rate deriving means, and the pressure reduction rate upper limit value setting means performs diving. Based on the atmospheric pressure information on the water surface and the sea level above the water level, the upper limit value of the pressure decrease rate at the time of ascent during diving is set, and the upper limit value of the pressure decrease rate is higher than the sea level of the water surface. Characterized in that it is set smaller.
[0010]
In the present invention, when monitoring whether or not the pressure decrease rate that occurs when diving rises is appropriate, a predetermined pressure decrease rate upper limit value is set for each atmospheric pressure on the water surface. This pressure reduction rate is a value obtained by dividing the difference in absolute pressure t seconds (minutes) before the current absolute pressure by the time t 1, and is compared with the upper limit value of the pressure reduction rate corresponding to the current atmospheric pressure. Do. For example, the pressure reduction rate upper limit value is set to a small value in high altitude diving where the water pressure is low. This is because the change in absolute pressure at the time of ascent per unit time is larger in high altitude diving with a low water pressure than in low diving with a high water pressure. That is, the magnitude of the absolute pressure ratio before and after ascending per unit time is an important problem rather than the rate of decrease in the water pressure value when ascending during diving. In Japanese Patent Laid-Open No. 10-250683, the upper limit of the ascent rate is determined according to the current depth of water. Some are set to values. In addition, since the focus is on the magnitude of the absolute pressure ratio before and after the ascent, the safety at the time of ascent is monitored by the pressure value without simply using the ascent rate. This is because, for example, when the density of water is different, such as fresh water and seawater, the change in pressure is different even at the same ascent rate. Therefore, in the present invention, the upper limit of the pressure reduction rate is allowed so that a relatively large pressure reduction rate is allowed in low altitude diving with a high water pressure and only a relatively small pressure reduction rate is allowed in high altitude diving with a low water pressure. By setting a value, it is possible to determine appropriate safety when ascending.
[0011]
The information processing apparatus for divers according to claim 2 predicts a subsequent pressure reduction rate from the pressure reduction rate previously derived by the pressure reduction rate deriving means and the rate of change of the current pressure reduction rate. A pressure reduction rate prediction means is provided.
[0012]
If you ascend abruptly when diving, the risk of decompression sickness increases, and there is a risk that the air in the lungs expands and the lungs burst due to the decompression associated with a sudden ascent. In order to prevent this, it is dangerous to give a warning after reaching a dangerous speed, and a notification method is required so that the dangerous speed is not reached. For that purpose, it is important to examine the rate of change of the pressure decrease rate and predict from that rate of change that the dangerous ascent rate will not be reached. Can provide great safety.
[0013]
Therefore, it is preferable that the pressure reduction rate prediction means is configured to predict the pressure reduction rate from the previously derived pressure reduction rate and the change rate of the currently derived pressure reduction rate until the end of the dive. It is more preferable that the pressure decrease rate after a few seconds can be sequentially predicted.
[0014]
According to a third aspect of the present invention, there is provided the information processing apparatus for divers according to the first aspect, wherein the pressure reduction rate upper limit value setting unit is configured to perform a diving operation based on the pressure value measured by the pressure measurement unit and a preset pressure change rate. The upper limit value of the pressure decrease rate at the time of ascent is set.
[0015]
Here, the pressure change rate is a value obtained by dividing the absolute pressure value after t seconds (minutes) by the current absolute pressure. By using this pressure change rate, the pressure decrease rate upper limit value can be set only from the current pressure value, so that the process of setting the pressure decrease rate upper limit value based on the atmospheric pressure information on the water surface and the current water depth can be saved and processed. Has the effect of decreasing.
[0016]
The divers information processing apparatus according to claim 4 is the information processing apparatus according to any one of claims 1 to 3, wherein the current pressure reduction rate is notified or the upper limit value of the pressure reduction rate is compared with the current pressure reduction rate. And when the present pressure reduction rate is larger than the said pressure reduction rate upper limit, it has the pressure reduction rate alerting means which gives a warning, It is characterized by the above-mentioned.
[0017]
In this way, when the pressure reduction rate is continuously changed by the notification means by the notification means, it is possible to grasp sensuously whether the pressure decrease rate is increasing or decreasing at present, and dangerous pressure decrease It has the effect of making it easier to communicate the danger to the diver before the rate is reached.
[0018]
By continuously changing the notification level according to the level of the alarm sound frequency, it is possible to express the continuous change by transmitting the pressure decrease rate, and whether the pressure decrease rate is increasing or decreasing at present. It can be grasped sensuously and there is an effect that it becomes easy to transmit the danger to the diver before reaching the dangerous pressure reduction rate. In particular, if the frequency is increased when a dangerous pressure reduction rate is approached, it is easy to intuitively recognize that the danger is imminent.
[0019]
In addition, by continuously changing the notification level according to the tempo of the alarm sound, it is possible to express a continuous change by transmitting the pressure decrease rate, and the pressure decrease rate tends to increase intuitively at the present time. Whether or not there is a tendency to decrease can be grasped, and it is easy to transmit the danger to the diver before reaching the dangerous pressure reduction rate. In particular, if the tempo is increased when a dangerous pressure reduction rate is approached, it will be intuitively recognized that humans are in danger so that their heart rate will increase when they are in danger. It has the effect that it is easy to do.
[0020]
Furthermore, by continuously changing the notification level according to the volume of the alarm sound, the pressure decrease rate can be reported to express a continuous change, and the pressure decrease rate is increasing or decreasing at the present time. It is possible to grasp sensuously whether or not there is an effect, and it is easy to notify the diver of the danger before reaching the dangerous pressure reduction rate. In particular, if the volume is increased when a dangerous pressure reduction rate is approached, there is an effect that the danger can be recognized more easily and the diver's attention can be easily drawn.
[0021]
Further, the notification level may be continuously changed depending on the amplitude of the vibration alarm and the speed of the vibration alarm. If you use vibration alarms like this, you won't be confused by your own warnings or other people's warnings as in the case of an alarm sound, so the information on the pressure reduction rate is directed at you This can be recognized early and has an effect of preventing the pressure reduction rate from reaching a dangerous value. In particular, if the tempo is increased when a dangerous pressure reduction rate is approached, it is easy to recognize that you are in danger so that your heart rate will increase when you are in danger. It has the effect.
[0022]
The divers information processing device according to claim 5 is the pressure reduction rate upper limit value display means for displaying the tolerance of the pressure reduction rate with respect to the pressure reduction rate upper limit value according to any one of claims 1 to 4. It is characterized by having. Using the display unit in this way is also effective as a means for notifying the diver of the danger of the pressure reduction rate. If this display unit is used in combination with the notification means described in claims 1 to 5, there is an effect that the transmission of the danger to the diver becomes easier.
[0023]
It should be noted that claims 1 to 5 may be used in any combination, and it is only necessary to inform the diver of danger in an easy-to-understand manner.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
[overall structure]
FIG. 1 is a plan view showing an apparatus main body and part of an arm band of an information processing apparatus for divers according to the present embodiment. FIG. 2 is a block diagram thereof.
In FIG. 1, the information processing apparatus 1 of this embodiment is also called a so-called dive computer, calculates the depth position and diving time of divers during diving, displays them, and accumulates them in the body during diving. The amount of inert gas (mainly nitrogen amount) is measured, and from this measurement result, the time for the nitrogen accumulated in the body to be exhausted after being on land after diving is displayed.
In this information processing apparatus 1, arm bands 3 and 4 are connected to a circular apparatus body 2 on the 6 o'clock side and 12 o'clock side of a wristwatch, respectively. Can be used by attaching to. In the apparatus main body 2, an upper case and a lower case are fixed by a method such as screwing in a completely watertight state, and a substrate (not shown) on which various electronic components and the like are mounted is accommodated therein.
[0026]
The display unit 10 using the liquid crystal display panel 11 is configured on the upper surface side of the apparatus main body 2, and switches A and B including two push buttons are configured on the 6 o'clock side of the wristwatch. Here, the switches A and B are the operation unit 5 for selecting and switching each mode performed in the information processing apparatus 1.
A diving operation switch 30 using a moisture detection sensor for monitoring whether or not diving is started is configured on the 9 o'clock side of the wristwatch among the upper surface side of the apparatus main body 2. The diving operation monitoring switch 30 includes two electrodes 31 and 32 exposed on the upper surface of the apparatus main body, and these electrodes 31 and 32 are conducted with seawater or the like, and the resistance value between the electrodes 31 and 32 is reduced. Sometimes it is determined that diving has started. However, the diving operation monitoring switch 30 is only used to detect that water has entered and shifts to the diving mode, and does not detect that one dive has started. That is, the arm on which the information processing apparatus 1 is mounted may be just immersed in seawater, and in such a case, it should not be treated as having started diving. Therefore, in the information processing apparatus 1 of the present embodiment, diving is started when the water depth (water pressure) exceeds a certain level by the pressure sensor built in the apparatus main body, for example, when the water depth value is deeper than 1.5 m in the present embodiment. It is considered that the dive has been completed when it becomes shallower than this depth value.
[0027]
As shown in FIG. 2, the information processing apparatus 1 according to the present embodiment performs processing in each mode and a liquid crystal display panel 11 for displaying various types of information, a liquid crystal driver 12 that drives the liquid crystal display panel 11, and in each mode. The display unit 10 is configured by the control unit 50 that causes the liquid crystal display panel 11 to perform the corresponding display. An output from the diving operation monitoring switch 30 using the switches A and B and the water detection sensor is input to the control unit 50.
Since the divers information processing apparatus 1 measures the normal time and monitors the dive time, the clock output from the oscillation circuit 31 is input to the control unit 50 via the frequency dividing circuit 32, and the time The counter 33 constitutes a time measuring unit 68 for measuring time in units of 1 second.
[0028]
Further, the divers information processing apparatus 1 measures and displays the water depth and measures the amount of nitrogen gas (inert gas) accumulated in the body from the water depth (water pressure) and the diving time. A sensor 34 (semiconductor pressure sensor), an amplification circuit 35 for the output signal of the pressure sensor 34, and an A / D conversion circuit 36 that converts an analog signal output from the amplification circuit 35 into a digital signal and outputs it to the control unit 50. The pressure measurement part 61 provided with is comprised. Further, the information processing apparatus 1 includes a notification device 37 and a vibration generation device 38, which can transmit a warning or the like to the diver as an alarm sound or vibration. In the pressure measurement, both the water depth measurement and the atmospheric pressure measurement may be measured by one sensor, or the water depth measurement and the atmospheric pressure measurement may be measured using separate sensors.
[0029]
In the present embodiment, the control unit 50 includes a CPU 51 that controls the entire apparatus, and a control circuit 52 that controls the liquid crystal driver 12 and the time counter 33 under the control of the CPU 51, and is stored in the ROM 53. Each mode, which will be described later, is realized by each process performed by the CPU 51 on the basis of the program.
The divers information processing apparatus 1 is configured to monitor a diver's pressure reduction rate during a diving mode to be described later, and this function is realized as the following configuration using functions of the CPU 51, ROM 53, RAM 54, and the like. .
[0030]
That is, as shown in FIG. 3, in the divers information processing apparatus 1, the pressure reduction rate deriving unit that measures the pressure reduction rate during ascent based on the measurement result of the time measuring unit 68 and the measurement result of the pressure measuring unit 61. 751 and the pressure reduction rate upper limit setting unit based on the atmospheric pressure information of the water surface before the start of diving measured by the pressure measurement unit 61 or based on the atmospheric pressure information of the water surface before the start of diving input by the operation unit 5 The pressure reduction rate comparison unit 791 that compares the pressure reduction rate upper limit set by 76 with the pressure reduction rate derived by the pressure reduction rate deriving unit 751 described above, and the pressure previously derived by the pressure reduction rate deriving unit 751 The difference between the rate of decrease and the current rate of decrease in pressure is taken, the rate of change in the rate of decrease in pressure divided by the previous time and the current time is obtained, and the rate of decrease in pressure predicting unit 75 predicts the rate of decrease in pressure after a few seconds. If the pressure reduction rate at the present or several seconds later is greater than the upper limit of the pressure reduction rate, a warning is given that the pressure reduction rate is violated, and the current or several seconds later pressure reduction rate is reported directly, or the current or several seconds The pressure reduction rate notification unit 771 is configured to notify how much the subsequent pressure reduction rate corresponds to the upper limit value of the pressure reduction rate. Here, the pressure reduction rate may be reported by converting it to a floating speed considering the density of the seawater or fresh water so that the diver can easily recognize it. Further, the pressure reduction rate upper limit setting unit 76 may set the pressure reduction rate upper limit using the pressure change rate from the current pressure value. The pressure reduction rate deriving unit 751 is realized as the calculation function of the CPU 51, ROM 53, and RAM 54 shown in FIG. 2, while the pressure reduction rate notifying unit 771 is the CPU 51, ROM 53, RAM 54, notification device 37, vibration shown in FIG. This is realized as a function of display on the generator 38 and the liquid crystal panel 11.
[0031]
In this embodiment, the pressure reduction rate notification unit 771 compares the current pressure reduction rate with the pressure reduction rate upper limit value for each water pressure range set by the pressure reduction rate upper limit setting unit 76 and stored in the ROM 53. When the current pressure reduction rate is larger than the pressure reduction rate upper limit value corresponding to the current water surface pressure, the display on the liquid crystal display panel 11, the generation of an alarm sound from the sound report device 37, A warning of violation of the pressure reduction rate is issued by a method such as transmission of vibration from the vibration generator 38 to the diver, and the warning of violation of the pressure reduction rate is stopped when the state returns to a state later than the upper limit value of the pressure reduction rate.
[0032]
In this embodiment, the pressure reduction rate notification unit 771 uses the information on the pressure reduction rate obtained by the pressure reduction rate deriving unit 751 as the frequency of the alarm sound from the reporting device 37 as the pressure reduction rate increases. Communicate by changing to be higher. Not only the frequency of the alarm sound but also the tempo of the alarm sound or the volume of the alarm sound may be changed. Further, the pressure reduction rate notification unit 771 may use the vibration generator 38, and may be the amplitude of vibration, the tempo of vibration, or the like. In addition, the pressure reduction rate notification unit 771 may use the display 11 from the pressure reduction rate obtained by the pressure reduction rate deriving unit 751 and the pressure reduction rate upper limit set by the pressure reduction rate upper limit setting unit 76. The pressure reduction rate tolerance at the present time with respect to the upper limit value of the pressure reduction rate is derived by the pressure reduction rate comparison unit 791, and the derived result is displayed on the display 11. As a display method, it may be displayed graphically as a bar graph 118 in FIG.
[0033]
Further, the pressure reduction rate notification unit 771 may combine the sound reporting device 37, the vibration generating device 38, and the display 11.
[0034]
Further, in the information processing apparatus 1 for divers, from the time when the water depth value measured by the pressure measuring unit 61 becomes deeper than 1.5 m (water depth value for diving start determination), from 1.5 m (water depth value for diving end determination). A diving result recording unit 78 is configured to store and hold the diving result (various data such as diving date, diving time, maximum water depth, etc.) in the RAM 54 as a single diving operation until it becomes shallow. ing. The diving result recording unit 78 is also realized as a function of the CPU 51, the ROM 53, and the RAM 54 shown in FIG. Here, the diving result recording unit 78 indicates that there is a violation of the pressure reduction rate when the pressure reduction rate notification unit 771 issues a plurality of warnings continuously, for example, two or more warnings in a single dive. Is recorded as a diving result, and when a past diving result is reproduced and displayed in a log mode, which will be described later, it is also reproduced and displayed that a pressure decrease rate violation occurred during diving. The diving result recording unit 78 is shallower than 1.5 m (water diving end determination water depth value) after the water depth value measured by the pressure measuring unit 61 becomes deeper than 1.5 m (water diving start determination water depth value). Until then, the diving time is measured based on the measurement result of the time measuring unit 68. If the diving time is less than 3 minutes, the diving during this time is not treated as a single dive, and the diving result during that time is recorded. do not do. In the diving result recording unit 78, the diving result is recorded and held as a maximum of 10 log data, and when diving further, the old data is deleted in order, so when a short dive such as a simple dive is also recorded, This is because important diving results are deleted.
[0035]
[Description of sound generation circuit]
Here, the report sound generation circuit will be described with reference to FIG.
As shown in FIG. 11, the sound generation circuit includes a booster coil 371, a piezoelectric element buzzer 372, an IC 373, a transistor 374, and a buzzer driving power source 375. Electricity is supplied from the buzzer driving power source 375 to the booster coil 371 to boost the voltage. As a result, an AC voltage is applied to the piezoelectric element buzzer 372, and a report sound (alarm sound) is generated.
[0036]
[Description of vibration generator]
Next, a vibration generator is demonstrated using FIG.12, FIG.13, FIG.14.
An eccentric weight 384 is provided in a step motor as shown in FIG. 12, and it is continuously rotated to transmit vibration and transmit a vibration alarm.
The vibration alarm step motor has a rotor 385, a stator 382a, a stator 382b, a magnetic core 387, and a single-phase drive coil 381.
Further, a permanent magnet 389 and an eccentric weight 384 are coaxially attached to the rotor 385 on the rotary shaft 382.
The permanent magnet 289 is mainly made of a rare material, and is preferably made of, for example, samarium cobalt and is magnetized to at least two poles.
The eccentric weight 384 is preferably made of heavy metal in order to enhance the notification effect due to vibration, and for example, a gold alloy, a tungsten alloy, or the like is used.
The rotor 385 is disposed so as to be surrounded by two pieces of stators 382a and 382b.
[0037]
FIG. 14 shows an enlarged view of the vicinity of the stator.
The two pieces of stators 382a and 382b are opposed to each other at eccentric positions, and are fixed with screws 380 to form a magnetic circuit with the magnetic core 387.
Further, the stators 382a and 382b and the magnetic core 387 are preferably made of a high magnetic permeability member such as a permalloy alloy in order to increase the magnetic permeability. In addition, a single-phase drive coil is wound around the magnetic core 387.
As shown in FIG. 12, the drive circuit of the vibration alarm step motor includes a CPU 51, a steering circuit 386, and a driver circuit 388. The CPU 51 generates a driving pulse P1 and sends a signal to the steering circuit 386.
[0038]
The driver circuit 388 includes a PMOS transistor Tr1, a PMOS transistor Tr4, an NMOS transistor Tr2, and an NMOS transistor Tr3.
Among the control signals C1 to C4 of the steering circuit 386, the control signal C1 is input to the gate of the PMOS transistor Tr1, the control signal C2 is input to the NMOS transistor Tr2, and the control signal C3 is input to the NMOS transistor Tr3. A control signal C4 is input to the gate of the PMOS transistor Tr4.
One terminal of the drive coil 381 is connected to the drains of the PMOS transistor Tr1 and the NMOS transistor Tr2. The other terminal of the drive coil 381 is connected to the drains of the NMOS transistor Tr3 and the PMOS transistor Tr4.
[0039]
Next, the operation of the vibration alarm generation circuit will be described with reference to FIGS.
During the period when the drive pulse P1 is not output from the CPU 51, the control signals C1 to C4 from the steering circuit 386 are all at the “L” level, and the PMOS transistor Tr1 and the PMOS transistor Tr4 are in the ON state. The high potential side power supply voltage Vdd is applied.
Thereafter, when the drive pulse P1 is output, the steering circuit 386 sets the control signal C1 and the control signal C2 as a group, the control signal C3 and the control signal C4 as another group in synchronization with the drive pulse P1, and for each group. Alternately “H” level.
[0040]
As a result, when the control signal C1 and the control signal C2 become “H” level, the PMOS transistor Tr1 is turned off, the NMOS transistor Tr2 is turned on, the NMOS transistor Tr3 is turned off, and the PMOS transistor Tr4 is turned on.
Therefore, the current flows in the order of high potential side power supply Vdd → PMOS transistor Tr4 → drive coil 381 → NMOS transistor Tr2 → low potential side power supply Vss, and the rotor 385 rotates by magnetizing the stator 382 in the first direction. Become.
[0041]
Subsequently, the next drive pulse P1 is generated, and the control signals C3 and C4 are set to the “H” level and the control signals C1 and C2 are set to the “L” level.
Accordingly, the PMOS transistor Tr1 is turned on, the NMOS transistor Tr2 is turned off, the NMOS transistor Tr3 is turned on, and the PMOS transistor Tr4 is turned off.
Therefore, the current flows in the order of high potential side power source Vdd → PMOS transistor Tr1 → drive coil 381 → NMOS transistor Tr3 → low potential side power source Vss, and the stator 382 is magnetized in the second direction opposite to the first direction. As a result, the rotor 385 rotates.
Thereafter, by repeating the above operation, a continuous operation is performed and a warning of a pressure decrease rate violation is notified.
[0042]
[Description of display section]
Referring again to FIG. 1, the display surface of the liquid crystal display panel 11 is composed of nine display areas. These nine display areas are divided into a display area 11A located in the center and an annular display area 11B located on the outer peripheral side thereof. Separated. In this embodiment, the display area 11A and the annular display area 11B positioned outside the display area 11A are circular. However, the display area 11A is not limited to a circle, and may be an ellipse, a track, or a polygon.
Of the display areas 11A, the first display area 111 located on the 12 o'clock side of the wristwatch is the largest among the display areas, and includes a diving mode, a surface mode (time mode), and planning, which will be described later. In the mode and log mode, the current water depth, current date, water depth rank, and diving date (log number) are displayed. The second display area 112 located at 3 o'clock from the first display area 111 has a dive time, a current time, and no decompression in diving mode, surface mode (time mode), planning mode, and log mode, respectively. The dive time and dive start time (dive time) are displayed. The third display area 113 located on the 6 o'clock side from the first display area 111 has a maximum water depth and a body nitrogen discharge time in the diving mode, surface mode (time mode), planning mode, and log mode, respectively. , Safety level, maximum water depth (average water depth) are displayed. The fourth display area 114 located on the 3 o'clock side from the third display area 113 has a no-decompression dive time and a water surface pause in diving mode, surface mode (time mode), planning mode, and log mode, respectively. The time, temperature, and dive end time (maximum depth water temperature) are displayed. In the fifth display area 115 located at the 6 o'clock side from the third display area 113, a power capacity capacity warning 104 and a high place rank 103 are displayed. The amount of nitrogen in the body is displayed in a graph in the sixth display area 116 located on the most 6 o'clock side of the liquid crystal display panel 11. In addition, in the seventh display area 117 located on the 3 o'clock side from the sixth display area 116, is nitrogen (inert gas) tending to be absorbed when a reduced pressure diving state is entered in the diving mode? An area that indicates whether or not there is a tendency to discharge, an area that displays “SLOW” as one of the pressure reduction rate violation warnings that the pressure reduction rate is too high, and a “ An area for displaying “DECO” is configured. In addition, in the eighth display area 118 located on the 6 o'clock side from the seventh display area 117, the pressure decrease rate that changes during the ascent in the diving mode is displayed in a graph.
[0043]
[Explanation of how to calculate the amount of nitrogen in the body]
FIG. 4 is a functional block diagram for explaining a configuration example for calculating the in-vivo nitrogen partial pressure (in-body inert gas amount) in the information processing apparatus for divers 1 of the present embodiment. The calculation of the amount of nitrogen in the body shown here is merely an example, and various methods can be used. Therefore, the configuration for that purpose will be briefly described here. For the calculation method of the decompression condition after diving performed in the information processing apparatus for divers of the present embodiment, see KEN LOYST et al. "DIVE COMPUTERS A CONSUMER'S GUIDE TO HISTORY, THEORY & PERFORMANCE '" by Watersports Publishing Inc. (1991). The literature on the theory includes A. A. For more information on "Decompression-Decompression Sickness" by Buhlmann, Springer, Berlin (1984). Both of these documents suggest that the inert gas dissolved in the body by diving causes decompression sickness. Here, from the viewpoint of more reliably preventing decompression sickness, A. A. "Decompression-Decompression Sickness" by Buhlmann, Springer, Berlin (1984), pp. The calculation method described in 14 is also studied.
[0044]
In the divers information processing apparatus 1 of the present embodiment, as shown in FIG. 4, the pressure sensor 34, the amplifier circuit 35, and the A / D conversion circuit 36 shown in FIG. A pressure measuring unit 61 that measures the water depth (water pressure) and atmospheric pressure used, a CPU 51, a ROM 53, and a RAM 54 shown in FIG. 2, which are realized as functions of the respiratory air nitrogen partial pressure calculating unit 62, and a RAM 54 shown in FIG. Respiratory nitrogen partial pressure storage unit 63, internal nitrogen partial pressure calculation unit 64 realized as a function of CPU 51, ROM 53, and RAM 54 shown in FIG. 2, internal nitrogen partial pressure storage unit 65 using RAM 54 shown in FIG. 2 is realized as a function of the time counting unit 68 using the time counter 33 shown in FIG. 2, the CPU 51, the ROM 53, and the RAM 54 shown in FIG. Comparing unit 66 for performing data comparison stored in the pressure storage unit 65, half-saturation time selecting section 67 is configured to be implemented as a function of the CPU 51, ROM 53, RAM 54 shown in FIG. Among these components, the respiratory nitrogen partial pressure calculation unit 62, the in-vivo nitrogen partial pressure calculation unit 64, the comparison unit 66, and the half-saturation selection unit 67 are realized as software by the CPU 51, the ROM 53, and the RAM 54 of FIG. Although it is possible, it can be realized by using only a logic circuit that is hardware, or a combination of a logic circuit and a processing circuit including a CPU and software.
[0045]
In this configuration example, the pressure measuring unit 61 calculates and outputs the water pressure P (t) corresponding to the time t.
The respiratory air nitrogen partial pressure calculation unit 62 calculates and outputs the respiratory air nitrogen partial pressure PIN2 (t) based on the water pressure p (t) output from the pressure measurement unit 61. Respiratory nitrogen partial pressure PIN2 (t) is calculated from the water pressure P (t)
PIN2 (t) = 0.79 × P [bar]
Can be obtained by calculation.
The respiratory air nitrogen partial pressure storage unit 63 stores the value of PIN2 (t) calculated by the respiratory air nitrogen partial pressure calculation unit 62 as shown in the above equation.
The body nitrogen partial pressure calculation unit 64 calculates the body nitrogen partial pressure PGT (t) for each tissue having different nitrogen absorption / extraction rates. Taking one organization as an example, the in-vivo nitrogen partial pressure PGT (tE) absorbed / extracted from the dive time t = t0 to tE is stored as the in-vivo nitrogen partial pressure PGT (tE) at t0. Stored in unit 65. The calculation formula for this is as follows.
[0046]

Here, k is a constant obtained experimentally.
[0047]
Next, the comparison unit 66 compares PIN2 (t), which is the result of the respiratory nitrogen partial pressure storage unit 63, with PGT (t), which is the result of the body nitrogen partial pressure unit 5, and as a result, a half-saturation time selection unit 67, the half-saturation time TH used in the in-vivo nitrogen partial pressure calculation unit 64 is made variable.
For example, when the respiratory air nitrogen partial pressure PIN2 (t0) and the in-vivo nitrogen partial pressure PGT (t0) at t = t0 are stored in the respiratory air nitrogen partial pressure storage unit 63 and the in-vivo nitrogen partial pressure storage unit 65, respectively. Then, the comparison unit 66 compares PIN2 (t0) with PGT (t0).
[0048]
The body nitrogen partial pressure calculation unit 64 is controlled by the half-saturation time selection unit 67 as follows to calculate the body nitrogen partial pressure PGT (tE) when t = tE.
[0049]

Here, in the above two equations, k is calculated as a constant, TH2 <TH1.
[0050]
When PGT (t0) = PIN2 (t0), it is preferable to calculate as half saturation time TH = (TH2 + TH1) / 2. Further, these times (measurements for t0 and tE) are managed by the time measuring unit 68 of FIG.
Here, when PGT (t0)> PIN2 (t0), nitrogen is discharged from the body, and when PGT (t0) <PIN2 (t0), nitrogen is absorbed into the body. Changing the half-saturation time at these times means that when nitrogen is discharged, the half-saturation time is long and it takes time to discharge, and conversely, when nitrogen is absorbed, the half-saturation time is long. It is short and the time taken for breathing is short compared to the time taken for excretion. In this way, the simulation of the amount of nitrogen in the body can be performed more strictly, so if the upper limit value of the amount of nitrogen in the body is set, the time allowed for no decompression diving and the surface of the water increased from the current amount of nitrogen in the body Thereafter, the time until the amount of nitrogen in the body returns to the normal state can be obtained. Therefore, if such information is notified to the diver, the safety of diving can be improved.
[0051]
[Description of each mode]
The information processing apparatus 1 configured as described above is in each mode (time mode ST1, surface mode ST2, planning mode ST3, setting mode ST4, diving mode ST5, log mode ST6) described below with reference to FIG. Can be used. FIG. 5 shows only items displayed in the display area 11 </ b> A among the display areas of the liquid crystal display panel 11.
[0052]
(Time mode ST1)
The time mode ST1 is a function when the switch is not operated and when the body nitrogen is in an equilibrium state and is carried on land. The liquid crystal display panel 11 has a current date 100, current time 101, altitude rank 102 (see FIG. Refer to 1. / If the altitude rank is 0, the mark is not displayed.) Is displayed. The altitude rank 102 automatically measures the altitude of the current location and displays it in three ranks. The current time 101 informs that this display is the current time 101 by blinking a colon. For example, in the state shown in FIGS. 5 and 6, it is displayed that the current time is 10:06 on December 5th.
[0053]
In addition, when you go up and down above and below the sea level, the air pressure changes, and nitrogen melts and discharges into the body regardless of whether you have dived in the past. Therefore, in the information processing apparatus 1 according to the present embodiment, the decompression calculation is automatically started when the altitude change occurs even in the time mode ST1, and the display changes. That is, although illustration is omitted, the time after the altitude changes, the time until the body nitrogen reaches an equilibrium state, and the amount of nitrogen discharged or dissolved from the present until the equilibrium state is displayed.
[0054]
In this time mode ST1, when the switch A is pressed, the mode directly shifts to the planning mode ST3, and when the switch B is pressed, the mode directly shifts to the log mode ST6. If the switch A is pressed and then the switch B is kept pressed for 5 seconds while the switch A is being pressed, the mode shifts to the setting mode ST4.
[0055]
(Surface mode ST2)
The information processing apparatus 1 automatically shifts to the surface mode ST2 when the diving operation monitoring switch 30 that has been conducted is in an insulated state after the diving is finished. This surface mode ST2 is a function for carrying on land until 48 hours have passed since the last dive. In the surface mode ST2, the data displayed in the time mode ST1 is as shown in FIG. 6 (current date 100, current time 101, altitude rank), as well as a guideline for changes in the body nitrogen after diving. indicate. That is, the time until the excess nitrogen dissolved in the body is discharged and the equilibrium state is reached is displayed as the body nitrogen discharging time 201. This in-vivo nitrogen excretion time 201 counts down the time until equilibrium is reached. No display is made after the body nitrogen excretion time 201 has reached 0:00. Further, the elapsed time after diving is displayed as a water surface pause time 202. This water surface pause time 202 is started at the time when the water depth becomes shallower than 1.5 m in the diving mode ST5, and time measurement is started for 48 hours. After measuring up to no display. Accordingly, in the information processing apparatus 1, the surface mode ST2 is set on land until 48 hours have elapsed after the diving is completed, and thereafter, the time mode ST1 is set. In the state shown in FIG. 5, it is currently displayed as 11:58 on December 5 and 1 hour and 13 minutes have passed since the end of the dive. In addition, it is displayed that the amount of nitrogen dissolved in the body by the diving performed so far corresponds to four in the in-vivo nitrogen graph 203, and the time from this state to the exhaust of excess nitrogen in the body to the equilibrium state (Natural nitrogen excretion time 201) is displayed as 10 hours 55 minutes, for example.
[0056]
In the surface mode ST2, when the switch A is pressed, the mode directly shifts to the planning mode ST3, and when the switch B is pressed, the mode directly shifts to the log mode ST6. If the switch B is pressed for 5 seconds while the switch A is pressed after the switch is pressed, the mode shifts to the setting mode ST4.
[0057]
(Planning mode ST3)
The planning mode ST3 is a mode in which the maximum depth of the next dive to be performed and a guide for the dive time can be input. In this mode, as shown in FIG. 7, a water depth rank 301, a no-decompression diving possible time 302, a safety level, an altitude rank, a water surface pause time 202, and a body nitrogen graph 203 are displayed. The display of the rank of the water depth rank 301 is sequentially changed from the low rank to the high rank, and each water depth rank 301 is 9 m, 12 m, 15 m, 18 m, 21 m, 24 m, 27 m, 30 m, 33 m, 36 m, 39 m. , 42m, 45m, 48m in order of 5 seconds. At this time, if the mode is shifted from the time mode ST1 to the planning mode ST3, it is a plan for the first diving in which there is no excessive nitrogen accumulation in the body due to past diving, so the body nitrogen graph 203 is 0 and the water depth is 15 m. Sometimes the no-decompression dive possible time 302 is displayed as 66 minutes. Therefore, it can be seen that decompression diving is possible up to less than 66 minutes at a depth of 12 m or more and 15 m or less. On the other hand, if the transition is made from the surface mode ST2 to the planning mode ST3, it is a plan for repeated diving with excessive nitrogen accumulation in the body due to past diving, so the in-body nitrogen graph 203 is for four, If the maximum water depth is 15 m, the no-decompression diving possible time 302 is displayed as 49 minutes. Therefore, it can be seen that no-decompression diving is possible up to less than 49 minutes at a depth of 12 m or more and 15 m or less.
[0058]
In the planning mode ST3, if the switch A is kept pressed for 2 seconds or more until the water depth rank 301 is displayed as 48 m, the mode is directly shifted to the surface mode ST2. Further, after the water depth rank 301 is displayed as 48 m, the mode automatically shifts to the time mode ST1 or the surface mode ST2. Furthermore, since the mode is automatically shifted to the surface mode ST2 or the time mode ST1 when there is no switch operation for a predetermined period, it is convenient because there is no need to perform the switch operation each time. On the other hand, when the switch B is pressed, the mode directly shifts to the log mode ST6.
[0059]
(Setting mode ST4)
The setting mode ST4 is a function for setting ON / OFF of a warning alarm and setting of a safety level in addition to the setting of the month and day 100 and the current time 101 as shown in FIG. In this setting mode ST4, the current date 100, year 106, current time 101, safety level (not shown), alarm ON / OFF (not shown), and altitude rank are displayed. The level can be set to two levels: a level at which normal decompression calculation is performed and a level at which decompression calculation is performed on the premise that the vehicle moves to an altitude rank place one rank higher after diving. Alarm ON / OFF is a setting for setting whether or not various warning alarms are sounded from the sound report device 37. If the alarm is set to OFF, the alarm does not sound. Therefore, in a device such as the information processing device 1 for divers that is particularly fatal, the power consumed for the alarm can be deleted, which is convenient.
[0060]
In this setting mode ST4, each time the switch A is pressed, the setting item is switched in the order of hour, second, minute, year, month, day, safety level, alarm ON / OFF, and the display of the corresponding portion flashes. At this time, when the switch B is pressed, the numerical value or character of the setting item changes, and when the switch B is kept pressed, the numerical value or character changes quickly. When the switch A is pressed while the alarm ON / OFF is blinking, the mode returns to the surface mode ST2 or the time mode ST1. If neither switch A or B is pressed for 1 to 2 minutes, the mode automatically returns to the surface mode ST2 or the time mode ST1.
[0061]
(Log mode ST6)
When the switch B is pressed in the time mode ST1 or the surface mode ST2, the mode directly shifts to the log mode ST6. The log mode ST6 is a function for storing and displaying various data when diving deeper than a water depth of 1.5 m in the diving mode ST5 for 3 minutes or more. Such diving data is sequentially stored as log data for each dive, and a maximum of 10 log data is stored and retained. When diving further, older data is deleted in order, and the latest 10 data are always stored. The diving is memorized.
In this log mode ST6, the log data is displayed on two screens that switch every 4 seconds. As shown in FIG. 10, on the first screen ST61, the diving date 601, the average water depth 509, the diving start time 603, the diving end time 604, the altitude rank, and the in-body nitrogen graph 203 when the diving is finished are displayed. . On the second screen ST62, the log number 605, the maximum water depth 608, the diving time 606, the water temperature 607 at the maximum water depth, the altitude rank, and the body nitrogen graph 203 when the diving is completed are displayed. . For example, in the state shown in FIG. 10, when the altitude rank is 0, the second dive on December 5 starts at 10:07 and ends at 10:45, followed by 38 minutes of diving. Is displayed. In this diving, the average water depth is 14.6m, the maximum water depth is 26.0m, and the water temperature at the maximum water depth is 23 ° C. Is displayed. In this way, in the log mode ST6, various information is displayed while automatically switching between the two screens, so that a large amount of information can be displayed even if the display surface is small.
[0062]
Further, in the log mode ST6, when the speed violation warning has occurred twice or more during the currently displayed diving, “SLOW” is displayed in the seventh display area 117 of the liquid crystal display panel 11, for example. To do.
In the log mode ST6, every time the switch B is pressed, the new data is switched to fortune-telling data, and after the most fortune-telling data is displayed, the mode is shifted to the time mode ST1 or the surface mode ST2. Even when the switch B is continuously pressed for 2 seconds or more in the middle, the mode shifts to the time mode ST1 or the surface mode ST2. Further, even when neither of the switches A and B is pressed for 1 to 2 minutes, the mode automatically returns to the surface mode ST2 or the time mode ST1, so that it is convenient because there is no need to perform the switch operation each time. On the other hand, when the switch A is pressed, the mode directly shifts to the planning mode ST3.
[0063]
(Diving mode ST5)
The diving mode ST5 is a diving mode. As shown in FIG. 9, in the no-decompression diving mode ST51, the current water depth 501, the diving time 502, the maximum water depth 503, the no-decompression diving possible time 302, and the in-body nitrogen graph 203 This is a function that displays information necessary for diving, such as altitude rank. For example, in the state shown in FIG. 5, 12 minutes have passed since the start of diving and the water depth is 16.8 m, and it is displayed that no further decompression diving can be continued for 42 minutes at this water depth. . In addition, it is displayed that the maximum water depth up to the present is 20.0 m, and further, it is displayed that the current amount of nitrogen in the body is at a level where four marks of the body nitrogen graph 203 are lit.
In this diving mode ST5, as described above as the pressure reduction rate monitoring function, rapid ascenting causes decompression sickness and lung overexpansion injury, so the pressure reduction rate deriving unit 751 always obtains the current pressure reduction rate. The pressure reduction rate notification unit 771 transmits the pressure reduction rate to the diver so that the diver can grasp the pressure reduction rate.
[0064]
Here, the pressure reduction rate
Pressure reduction rate = (P (t) −P (0)) / t (1)
P (0) is a pressure value at the present time, P (t) is a pressure value before t seconds (minutes), and t is a time taken for the pressure to change.
[0065]
The pressure value in this equation is an absolute pressure that is the sum of atmospheric pressure and water pressure. As shown in FIG. 3, the pressure information on the water surface is directly measured by the pressure measuring unit 61 or the pressure information is input by the operation unit 5 to obtain the water pressure information on the water surface. The value setting unit 76 selects and sets the pressure decrease rate upper limit value. On the other hand, if the pressure change rate per unit time is used from the current pressure value for setting the pressure decrease rate upper limit value, the setting of the pressure decrease rate upper limit value for each atmospheric pressure can be omitted, and the process can be simplified. Here, the rate of pressure change is
Pressure change rate = P (t) / P (0) ··· Equation (2)
Where P (t) is the pressure value after t seconds (minutes) and P (0) is the current pressure value. For example, if the pressure change rate per minute is set not to be 0.5 times or less, it is always half of the current pressure P (0) within one minute without considering the atmospheric pressure information and the water depth information. The upper limit value of the pressure reduction rate may be set so as not to be a value of. In short, keeping the pressure value from halving is the same as keeping the body air inflation from doubling. In addition, it is important to prevent sudden ascent during dive in the first place, and in reality, it may be slow after a certain dangerous pressure reduction rate upper limit is exceeded. Therefore, the following equation is used to predict the pressure decrease rate after t seconds (minutes).
[0066]
dP (t) = dP (0) + (dP (0) −dP (t ′)) / t ′ × t
Here, dp (t) is the pressure decrease rate after t seconds (minutes), dP (0) is the current pressure decrease rate, and dP (t ′) is the pressure decrease rate before t ′ seconds (minute). This makes it possible to predict the pressure decrease rate after t seconds (minutes). It is also possible to calculate the time until the pressure reduction rate upper limit is exceeded from the change rate of the current pressure reduction rate by modifying this equation. The formula is
t = (dPmax−dP (0)) × t ′ / (dP (0) −dP (t ′))
Where dP _max Is a pressure reduction rate upper limit value, dP (0) is the current pressure reduction rate, and dp (t ′) is a pressure reduction rate before t ′ seconds (minutes).
[0067]
In addition, NAUI (National Association of Underwater Instructors), one of the diving associations, teaches that the ascent rate should never exceed 18m per minute, and if considering safety, it should not exceed 10m per minute as much as possible. Instructed to emerge at. Taking this ascent speed as an example, for example, when considering altitude diving at an altitude of 3200 m, the air pressure on the water surface is calculated by the following formula:
P (0) = 10 × exp (−H / 8000)
Here, the water pressure P (0) and the water surface altitude H, where H = 3200 is substituted, and when the water pressure is specifically calculated, it becomes 6.7 msw, and diving is normally performed at a point of 0 m above sea level. Sometimes the water pressure is 10 msw, so 3.3 msw is about 3200 m high and the air pressure is low. Here, msw is used as the unit of pressure, but in diving, a meter of seawater is often a unit of measure for pressure.
[0068]
Now, when diving at a point of 0 m above sea level, if the surface rises from the depth of 10 m to the surface in 1 minute, the rate of pressure decrease is (20-10) / 1 = 10 msw / min from equation (1). The rate of change in pressure is reduced to 10 / (10 + 10) = 0.5 times from equation (2). On the other hand, when ascending to the water surface at an altitude of 3200 m at a rate of change equivalent to this pressure change rate of 0.5, the depth is 6.7 m in 1 minute (the pressure value is 13.4 msw to the water level (pressure value In other words, the upper limit of the pressure decrease rate per minute at a point of 0 m above sea level is 10 m, but it becomes 6.7 m at an altitude of 3200 m, which is a severe value. The altitude of points is classified at certain intervals, and the pressure reduction rate upper limit at that time is summarized as an example as follows.
[0069]
Altitude Pressure reduction rate upper limit
0m 10.0msw / min
0-800m 9.05msw / min
800-1600m 8.19msw / min
1600-2400m 7.41msw / min
2400-3200m 6.70msw / min
Thus, based on the atmospheric pressure information obtained by the pressure measuring unit 61 or the operation unit 5, the pressure reduction rate upper limit value is set by the pressure reduction rate upper limit value setting unit 76.
[0070]
Here, in order to notify the diver not to exceed the pressure decrease rate upper limit value, the alarm ringing frequency may be changed or combined with a vibration alarm as follows. The following is an example when setting a high altitude dive of 2400 m to 3200 m.
[0071]
Pressure decrease rate (msw / min) Alarm sound frequency (Hz)
4.7 to 5.7 500
5.7 to 6.7 1000
6.7 to 7.7 1500 (vibration alarm ON)
7.7 to 9.7 2000
9.7-4000
In this embodiment, the pressure decrease rate upper limit value is defined in accordance with the atmospheric pressure, but the pressure decrease rate upper limit value for each water depth may be set for each atmospheric pressure in consideration of the water depth. In addition, since this setting condition increases, it becomes complicated, so the pressure change rate may be set in advance, and the pressure decrease rate upper limit value may be set from this pressure change rate. If this is the case, there is no need to set in advance a pressure reduction rate upper limit value for each water surface pressure information and water depth information, and the processing can be simplified.
The change in the pressure reduction rate is also transmitted to the diver by display, and the pressure reduction rate is displayed on the display unit 118 in FIG. This makes it possible to avoid confusion when a plurality of divers use the same divers information processing apparatus and perform similar levitation to cause a ringing in the plurality of divers information processing apparatuses.
[0072]
In the diving mode ST5, when the switch A is pressed, the current time 101 and the current water temperature 504 are displayed as the current time display mode ST52 only while the switch A is pressed. In the state shown in FIG. 9, it is currently displayed that the time is 10:18 and the water temperature is 23 ° C. As described above, when the switch operation to that effect is performed in the diving mode ST5, the current time 101 and the current water temperature are displayed only for a predetermined period, so that only data necessary for diving is always displayed within a small display surface. Even if configured (non-decompression diving mode ST51), the present time 101 and the like can be displayed as needed (current time display mode ST52), which is convenient. Moreover, even in the diving mode ST5 as described above, since the switch operation is used to switch the display, information that the diver wants to know can be displayed at an appropriate timing.
[0073]
During the diving mode ST5, when the water surface ascends to a depth of less than 1.5 m, the surface mode is entered when the diving operation monitoring switch 30 that has been diverted and is in an insulated state is treated as having finished diving. Automatically shifts to ST2. During this time, the diving result recording unit 78 shown in FIG. 3 performs a single dive operation from the time when the water depth becomes 1.5 m or more to the time when the water depth becomes 1.5 m or less (diving date, Various data such as diving time and maximum water depth) are stored and held in the RAM 54. At the same time, if there are two or more consecutive warnings about the pressure reduction rate violation during the current dive, that fact is also recorded as a diving result.
The information processing apparatus 1 of the present embodiment is configured on the premise of non-decompression diving, but in the unlikely event of being in a decompression diving state, it notifies the diver with an alarm sound to that effect, and the following Switch to decompression diving display mode ST53.
[0074]
That is, in the decompression diving display mode ST53, the current water depth 501, the diving time 502, the body nitrogen graph 203, the altitude rank, the decompression stop depth 505, the decompression stop time 506, and the total ascent time 507 are displayed. In the state shown in FIG. 9, it is displayed that 24 minutes have passed since the start of diving and the water depth is 29.5 m. In addition, since the amount of nitrogen in the body exceeds the maximum allowable value and is dangerous, an instruction is displayed to ascend to a depth of 3 m and to stop decompression for 1 minute while protecting the safe pressure reduction rate. The In addition, an instruction to allow at least 5 minutes to reach the water surface as a safe pressure reduction rate is displayed. Furthermore, an upward arrow indicates that the amount of nitrogen in the body is currently increasing. Therefore, the diver is lifted after stopping the decompression based on the above-described display contents, and while the decompression is being performed, the downward arrow 509 indicates that the amount of nitrogen in the body is decreasing. INDUSTRIAL APPLICABILITY The information processing apparatus for divers of the present invention comprises means for confirming, warning and predicting the current pressure reduction rate so that the diver does not reach a dangerous pressure reduction rate when ascending. The risk of diver decompression and lung overexpansion injury in high altitude diving where the rate of pressure change is large even at the same ascending speed can be reduced.
[Brief description of the drawings]
FIG. 1 is a plan view showing an apparatus main body and a part of an arm band of an information processing apparatus for divers to which the present invention is applied.
FIG. 2 is an overall block diagram of an information processing apparatus for divers to which the present invention is applied.
FIG. 3 is a block diagram for performing a pressure reduction rate violation warning in the information processing apparatus for divers to which the present invention is applied.
FIG. 4 is a block diagram for calculating the amount of nitrogen in the body in the information processing apparatus for divers to which the present invention is applied.
FIG. 5 is a flowchart showing each function of the information processing apparatus for divers to which the present invention is applied.
FIG. 6 is an explanatory diagram regarding display in a time mode and a surface mode.
FIG. 7 is an explanatory diagram regarding display of a plan mode.
FIG. 8 is an explanatory diagram regarding display of a setting mode.
FIG. 9 is an explanatory diagram relating to dive mode display;
FIG. 10 is an explanatory diagram relating to display in a log mode.
FIG. 11 is an explanatory diagram of a sound reporting device.
FIG. 12 is an explanatory diagram of a vibration generator.
FIG. 13 is an operation explanatory diagram of the vibration generating device.
FIG. 14 is an explanatory diagram relating to a stator of a vibration generator.

Claims (5)

  Pressure measuring means for measuring water depth and atmospheric pressure, diving time timing means for measuring diving time, pressure measured by the pressure measuring means, and pressure for deriving a pressure decrease rate during ascent based on the timing means Decrease rate deriving means, pressure decrease rate upper limit setting means for setting the pressure decrease rate upper limit value, pressure decrease rate upper limit value set by the pressure upper limit value setting means, and current value derived by the pressure decrease rate deriving means A pressure reduction rate comparison means for comparing the pressure reduction rate, and the pressure reduction rate upper limit setting means is based on the atmospheric pressure information of the water surface where diving is performed and the sea level of the water surface, The pressure reduction rate upper limit value is set, and the pressure reduction rate upper limit value is set smaller as the sea level of the water surface becomes higher.   The pressure reduction rate prediction means for predicting a subsequent pressure reduction rate from the pressure reduction rate previously derived by the pressure reduction rate deriving unit and the change rate of the pressure reduction rate currently derived according to claim 1 is provided. Divers processing equipment.   2. The pressure reduction rate upper limit value setting unit according to claim 1, wherein the pressure reduction rate upper limit value setting unit sets the pressure reduction rate upper limit value during ascent during diving from a pressure value measured by the pressure measuring unit and a preset pressure change rate. Divers information processing apparatus characterized by the above.   4. The pressure reduction rate according to claim 1, wherein the current pressure reduction rate is notified, or the current pressure reduction rate is compared with the pressure reduction rate upper limit value and the current pressure reduction rate. An information processing apparatus for divers comprising pressure reduction rate notification means for giving a warning when the upper limit value is exceeded.   5. The divers information processing apparatus according to claim 1, further comprising pressure reduction rate upper limit value display means for displaying an allowance with respect to the pressure reduction rate upper limit value. 6.

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