JP2003344570A - Information processing unit for divers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide useful information required for a sinking and floating control operation so as to safely perform a diving operation. <P>SOLUTION: A water-pressure and depth-of-water measuring part 10 at an information processing unit for divers detects a water pressure or a depth of water at a predetermined measuring interval. A control and computing part 9 judges the sinking and floating state of a diver, on the basis of a change state of a detection value in a plurality of numbers of times of a measuring timing including a recent measuring timing, so as to acquire and control information regarding the sinking and floating state. Under the control of the part 9, a display part 2 and a notification part 8 notify the information regarding the sinking and floating state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a divers information processing apparatus, a divers information processing apparatus control method, a control program, and a recording medium, and in particular to divers information processing suitable for diving utilizing so-called neutral buoyancy. The present invention relates to an apparatus, a control method for an information processing apparatus for divers, a control program, and a recording medium.

2. Description of the Related Art An information processing device for divers equipped with a conventional pressure sensor (hereinafter referred to as a dive computer).
In the diving mode, which is the operation mode during diving,
Information necessary to secure the diver's safety with a certain algorithm, for example, the current water depth and the amount of inert gas accumulated in the body (N2, etc.) The speed is calculated, and the obtained calculation result is displayed on a display unit such as a liquid crystal display panel (see, for example, Patent Document 1).

By the way, when a rapid dive is performed during diving, or when diving for a long time at a deep water depth, decompression diving must be performed, which may result in nitrogen poisoning or oxygen poisoning. In addition, there is also a problem that decompression sickness is likely to occur when the rapid ascent is performed. Decompression sickness mainly occurs when inert gas accumulated in the body and blood in the body grows as bubbles to grow. When the diver dives, the ambient pressure increases, and the diver inhales higher pressure air. Breathing pressurized air will increase the amount of gas dissolved in tissues and blood. On the other hand, as it floats, the pressure decreases and becomes higher than the pressure of the gas around the body of the gas dissolved in the body. As a result, a supersaturated state may occur and bubbles may be generated, leading to decompression sickness, which may cause a safety problem. In water, it is necessary to maintain neutral buoyancy. It is necessary to prevent it from always rising or sinking underwater, but by maintaining neutral buoyancy, it is possible to maintain the position at the desired water depth and consume unnecessary labor. This is because it is possible not to do it.

[Patent Document 1] Japanese Patent Laid-Open No. 11-23747

[0003]

By the way, if the ascending surface is too fast, the joint diver (hereinafter referred to as "buddy") may be lost or may collide with an overhead obstacle. In the worst case, the lung may be overinflated or have decompression sickness. Having too little buoyancy can also lead to trouble. If you don't stay because you are admired by the beauty of the surroundings, the next time you look at the water depth gauge, you may end up diving 5 to 10 meters more quickly. In addition, in the state of submersion, the result is that you always struggle to go up a little higher, and you consume extra effort. Therefore, the adjustment of ups and downs in water requires practice and is an essential skill for diving. If you want to move underwater relying only on the underwater environment,
You need to set such boundaries yourself. If you don't have a clear goal, underwater,
Since there is no guide board, I get lost quickly. Therefore, during underwater activities, it is necessary to maintain a stagnation state and manage it so that the planned seismic intensity is not exceeded. Ascent rate is 1
Try to stay below 12 meters per minute. For safety, even within the diving range where decompression is not required, 3 in 5 meters
Since it is necessary to perform a safety stop for 5 minutes (5 minutes in Japan and Australia), it is necessary to manage the ups and downs.

In the information for ensuring the safety of divers,
In order to prevent the above-mentioned nitrogen poisoning, oxygen poisoning or decompression sickness, the time, safe ascent rate, current water depth value and time until exhaustion of inert gas excessively accumulated in the body are calculated, and display and notification are given. It has a function to inform the diver. In terms of providing safer diving, the need for float control is mentioned. Therefore, an object of the present invention is to provide an information processing device for divers that can provide useful information necessary for floating / sink management and can perform diving more safely.

[0005]

In order to solve the above-mentioned problems, the information processing apparatus for divers detects water pressure or water depth at a predetermined measurement interval, and detects values at a plurality of measurement timings including the current measurement timing. Of the submersible based on the change state of the submersible to obtain and manage information about the ups and downs status, and an information notification means for notifying the information about the ups and downs. There is. According to the above configuration, the floating / sink management unit detects the water pressure or the water depth at a predetermined measurement interval, and determines the floating / sink state of the diver based on the change state of the detected value at a plurality of measurement timings including the current measurement timing. The information about the ups and downs is obtained by discrimination and managed. Thereby, the information notifying means notifies the information regarding the floating state.

Further, the diver's information processing device detects water pressure or water depth at a predetermined measurement interval or dive time, calculates a difference between the preset water pressure value or water depth value, and dive. Person's ups and downs,
It is characterized in that it is provided with an ups and downs management means for managing, and an information informing means for informing information on the ups and downs of the diving person. According to the above configuration, the floating / sink management unit detects the water pressure or the water depth at the predetermined measurement interval or the diving time, calculates the difference between the preset water pressure value or the water depth value, and the diving person. Detecting the ups and downs of
to manage.

As a result, the information notifying means notifies the information regarding the floating / sinking state of the diver. In this case, the floating / sinking management unit may acquire the floating / sinking direction and the floating / sinking speed as the information on the floating / sinking state. Further, the information notifying means may display by a character, a figure or a number whether the staying state, the submerged state or the floating state. Furthermore, the information notifying means may include notifying means for notifying the staying state or the non-staying state. Furthermore, the floating / sink management means may include a setting means for setting a water depth value for which a staying state is desired to be set as a set staying water depth value. Further, the information notifying means may display information regarding a difference between the set accumulated water depth value and an actual water depth value.

Further, the floating / sinking management means includes a dive pattern calculation means for calculating a dive pattern up to a water depth corresponding to the set accumulated water depth value, and the information notification means displays to notify the dive pattern. You may do it. Furthermore, the floating / sink management means includes a dive time calculation means for calculating a dive time to reach a water depth corresponding to the set accumulated water depth value, and the information notification means displays so as to notify the dive time. You may Further, the floating / sink management means includes a timer for counting the measurement interval and the dive time, and a water pressure /
A water depth measuring unit may be provided. In addition, the control method of the information processing device for divers detects the water pressure or the water depth at a predetermined measurement interval, and based on the change state of the detected value at a plurality of measurement timings including the current measurement timing, the diver's floating / sinking state. It is characterized by including a floating and sinking management process of determining and managing information regarding the floating and sinking state, and an information notifying process of notifying information about the floating and sinking state.

Further, the control method of the information processing apparatus for divers detects water pressure or water depth at a predetermined measurement interval or dive time, and calculates a difference between the preset water pressure value or water depth value. In addition, a floating / sinking management process of detecting and managing the floating / sinking condition of the diver and an information notifying process of displaying information on the floating / sinking condition of the diver are provided. In this case, the floating / sinking management process may acquire a floating / sinking direction and a floating / sinking speed as the information on the floating / sinking state. Further, in the information notifying process, it may be possible to display by a character, a figure or a number whether the staying state, the submerged state or the floating state. Further, a setting process for setting a water depth value for which the retention state is desired to be set as the set retention water depth value may be provided. Furthermore, the floating / sink management process corresponds to the information about the difference between the set accumulated water depth value and the actual water depth value, the information about the diving pattern up to the water depth corresponding to the set accumulated water depth value, and the set accumulated water depth value. Information of at least one of the diving times to reach the water depth may be acquired, and the acquired information may be displayed in the information notification process.

The control program for causing the computer to control the information processing apparatus for divers includes a step of detecting water pressure or water depth at a predetermined measurement interval and a plurality of measurement timings including the current measurement timing. The method is characterized by including a step of determining a floating / sinking state of the diver based on the change state of the detected value, acquiring and managing information on the floating / sinking state, and a step of notifying information on the floating / sinking state. Also,
A control program for causing the computer to control the information processing device for divers, a step of detecting water pressure or water depth at a predetermined measurement interval or diving time, and a preset water pressure value or preset water depth value, It is characterized by including a step of calculating the difference to detect and manage the floating / sinking state of the diver, and a step of displaying information on the floating / sinking state of the diver. It is also possible to record each of the above control programs in a computer-readable recording medium.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described with reference to the drawings. [1] Overall Configuration In this embodiment, a floating and sinking management function is incorporated into a diver's information processing device called a dive computer. First, the overall configuration will be described. Figure 1
FIG. 1 is a schematic block diagram of a dive computer.
The dive computer is roughly divided into a power supply PW and an MPU.
1, a display unit 2, a clock unit 3, a pressure sensor 4, an analog / digital converter (hereinafter, A / D converter) 5,
It has a ROM 6 and a RAM 7. The power supply PW is
Provides electrical energy to the entire dive computer.
The MPU 1 controls the entire dive computer based on the control program stored in the ROM 6. The display unit 2 is composed of a liquid crystal display or the like, and displays various information under the control of the MPU 1. The timekeeping unit 3 measures the dive time, and also determines the dive elapsed time for determining various calculation data in the dive computer, acquiring resting time, various data necessary for storing and displaying the dive time.

The pressure sensor 4 operates when the power switch is turned on, detects the ambient pressure, converts it into a corresponding voltage, and outputs it as a pressure detection signal. The A / D converter 5 is
The pressure detection signal of the pressure sensor 4 is converted from analog to digital and output to the MPU 1 as pressure data. ROM
Reference numeral 6 is a non-volatile read-only memory that stores various control programs in advance. The ROM 6 stores in advance various data necessary for calculation, such as body compartment, half time, maximum allowable nitrogen partial pressure, which are used for planning non-decompression diving. The RAM 7 is a volatile memory that temporarily stores various information. For example, the diving data and the calculation result data of the MPU 1 are stored. FIG. 2 is a detailed configuration block diagram of the dive computer. The dive computer is roughly divided into a display unit 2 and a clock unit 3.
1, a notification unit 8, a control / calculation unit 9, a water pressure / depth measuring unit 10, a switch operating unit 11, and a diving operation monitoring switch 12. The display unit 2 includes a liquid crystal display panel 16 that displays information in each mode, and a liquid crystal driver 15 that drives the display of the liquid crystal display panel 16.

The clock unit 3 outputs an oscillation circuit 20 for outputting a reference clock signal, a frequency divider circuit 19 for dividing the reference clock signal, and a frequency-divided clock signal of the frequency divider circuit 19 for counting every one second. Time counter 1 that keeps time
8 is provided and outputs the time measurement result to the control / arithmetic unit 9. The notification unit 8 includes a notification device 13 for notifying the diver of various notification information via sound, light, etc., and a vibration generator 1 for notifying the diver of various notification information by vibration.
4 and 4 are provided. The control / arithmetic unit 9 includes the MPU 1 and
It includes a ROM 6, a RAM 7, and a control circuit 17 that performs various controls under the control of the MPU 1. The water pressure / depth measuring unit 10 includes a pressure sensor 4, an amplification circuit 21 that amplifies an output signal of the pressure sensor 4, and an A / D converter 5. The switch operation unit 11 includes an operator, and a diver performs various operations. The diving operation monitor switch 12 detects whether or not the dive computer is underwater in order to detect whether or not the dive computer has entered a diving state.

[2] Ascent Rate Monitoring Function FIG. 3 is a functional block diagram for realizing the ascent rate monitoring function. The dive computer is configured to monitor the flying speed of the diver during the dive mode, and this function is realized as the following configuration by using the functions of the MPU 1, ROM 6, RAM 7, and the like. In the dive computer, as shown in FIG. 3, the levitation speed measurement unit 22 that measures the levitation speed during levitation based on the time measurement result of the time measurement unit 3 and the measurement result of the water depth measurement unit 10, and the measurement result of the levitation speed measurement unit 22. And a preset floating speed reference data 23, and a floating speed violation determination unit 24 that issues a floating speed violation warning when the current floating speed is faster than the floating reference speed corresponding to the floating speed reference data 23, A dive result storage unit 25 for storing data relating to various dive such as dive history,
Water temperature measuring unit 26 that measures the water temperature at each predetermined measurement timing
A floating / sink management unit 27 that manages the diver's floating / sinking state and controls warnings, an information display unit 28 that displays various types of information, an alerting unit 29 that alerts various alerts, and various alerts. And a warning display unit 30.

Specifically, in the present embodiment, the levitation speed violation determination unit 24 compares the levitation reference speed for each water depth range stored in the ROM 6 as the levitation speed reference data 23 with the current levitation speed. If the current floating speed is faster than the floating reference speed at the current water depth, the alarm device 1
3) An alarm sound from 3 is generated, blinking of the display, etc., and vibration of the vibration generator 14 is transmitted to the diver to warn of the ascending speed, and the ascending speed becomes less than the ascending reference speed. Stop speeding warnings. In the present embodiment, the following values are set as the floating speed reference data 23 as an example of each water depth range. Water depth range Floating speed standard value less than 1.8m No warning 1.8m-5.9m 8m / min (about 0.8m / 6sec) 6.0m-17.9m 12m / min (about 1.2m / 6sec) 18m or more 16m / min (about 1.6m / 6sec) The reason why the floating speed reference value is set to be larger at a deeper water depth is that the same ascending speed is obtained at a deeper water depth. Since the water pressure ratio before and after ascent per unit time is small even when ascending, decompression sickness can be sufficiently prevented even if a relatively large ascent rate is allowed. On the other hand, when the water depth is shallow, the water pressure ratio before and after levitation per unit time is large even if the levitation speed is the same.
It allows only a relatively low ascent rate.

In this embodiment, the flying speed reference data 23
As a result, the levitation speed value per 6 seconds is stored in the ROM 6. Even if the water depth is measured every 1 second, the movement of the arm wearing the dive computer affects the calculated levitation speed. This is to prevent it. That is, since the floating speed measurement is also performed every 6 seconds for the same reason, the difference between the current water depth measurement value and the previous water depth measurement value 6 seconds ago is calculated,
This difference is compared with the flying reference speed corresponding to the flying speed reference data 23. In the dive result storage unit 25 of the dive computer, the water depth value measured by the water depth measurement unit 10 becomes shallower than 1.5 m again after the dive depth is deeper than 1.5 m (water depth value for judging dive start). Up to the point in time is one dive operation, and the dive result data (dive date / time data, dive management number data, dive time data, maximum dive depth data, water temperature data at the maximum dive depth, etc.) during this period are stored and retained in the RAM 7. . The diving result storage unit 25 also includes the MPU 1, the ROM 6, and the RAM 7 shown in FIG.
It is realized as a function of.

Here, the dive result storage unit 25 is configured such that the ascending velocity violation determination unit 24 warns a plurality of times continuously for one dive,
For example, the configuration is such that the fact that the ascending speed has been violated when two or more warnings are issued consecutively is stored as the diving result. The diving result storage unit 25 is used for the water depth measurement unit 10
The water depth value measured by is measured from the measurement result of the timekeeping unit 3 from the time when it becomes deeper than 1.5m (new water for judging the start of diving) until it becomes shallower than 1.5m, If the dive time is less than 3 minutes, the dive during this period is not treated as one dive, and the dive result during that period is not recorded. This is because an important dive record may be updated due to the memory capacity if all short dives such as a dive are to be stored. As described above, the dive computer according to the embodiment determines that a new dive is started when the water depth is 1.5 m or less and the dive time is 3 minutes or more. When it is less than 5 m, the water depth is treated as 0 m. As a result, when the water depth is slightly deeper than 1.5 m, the dive computer only keeps the ascent speed when the water depth becomes less than 1.5 m by raising the arm, but the ascent speed violation warning is issued. There is a possibility that Therefore, in this case, the ascending speed violation warning is not issued in such a case, and the reliability of the ascending speed violation warning is improved.

[3] Functional Configuration of Nitrogen Amount Calculation of Dive Computer FIG. 4 is a functional configuration block diagram for realizing the nitrogen amount calculation function of the dive computer. Next, a functional configuration for calculating the amount of nitrogen accumulated in the diver in the dive computer will be described with reference to the block diagram of FIG. As shown in FIG. 4, the dive computer has a respiratory air nitrogen partial pressure calculation unit 31, a respiratory air nitrogen partial pressure storage unit 32, a comparison unit 33, and a half-saturation in addition to the time counting unit 3 and the water pressure / water depth measuring unit 10 described above. A time selection unit 34, a body nitrogen partial pressure calculation unit 35, a body nitrogen partial pressure storage unit 36, a body nitrogen partial pressure discharge time deriving unit 37, and a diving possible time deriving unit 38 are provided. These are the components and M shown in FIG.
It can be realized by software executed by PU1, ROM6, and RAM7. However, the present invention is not limited to this, and it is also possible to realize only by a logic circuit which is hardware, or by combining a logic circuit and a processing circuit including an MPU and software. The respiratory gas nitrogen partial pressure measuring unit 31 calculates a respiratory gas nitrogen partial pressure PIN2 (t) described later based on the water pressure P (t) at the current time t, which is the measurement result of the water pressure / water depth measuring unit 10.

As a result, the respiratory air nitrogen partial pressure storage unit 32 is
The nitrogen partial pressure PIN2 (t) of the respiratory air calculated by the respiratory air nitrogen partial pressure calculator 31 is stored. On the other hand, the half-saturation time selection unit 3
4 is the half-saturation time T used when calculating the partial pressure of nitrogen in the body
The H is output to the body nitrogen partial pressure calculation 35. The in-vivo nitrogen partial pressure calculating unit 35 calculates in-vivo nitrogen partial pressure PGT (t), which will be described later, for each tissue site having different nitrogen absorption / exhaustion rates. The internal nitrogen partial pressure storage unit 36 stores the internal nitrogen partial pressure PGT (t) calculated by the internal nitrogen partial pressure calculation unit 35. As a result, the comparison unit 33 compares the respiratory air nitrogen partial pressure PIN2 (t) and the internal nitrogen partial pressure PGT (t), and changes the half-saturation time TH based on the comparison result.

[4] Calculation Method of Nitrogen Partial Pressure in Body Next, a concrete calculation method of nitrogen partial pressure in the body will be described.
The method of calculating the partial pressure of nitrogen in the body performed in the dive computer 1 of the present embodiment is described in, for example, KENLOYST et
al.'s "DIVE COMPUTERS A CONSUMER'S GUIDE TO HIST"
ORY, THEORY & PERFORMANCE '' Watersport Publishing In
c. (1991) and AA Buhlmann's "Decompression-Decomp
ression Sickness "(especially page 14), Springer, Berli
n (1984). The method for calculating the nitrogen partial pressure in the body shown here is merely an example, and various methods other than this can be used. First, the water pressure / water depth measuring unit 10 outputs the water pressure P (t) corresponding to the time t. Here, P (t) means absolute pressure including atmospheric pressure.
The respiratory air nitrogen partial pressure calculation unit calculation 31 is the water pressure / water depth measurement unit 1
Based on the water pressure P (t) output from 0, the respiratory air nitrogen partial pressure PIN2 corresponding to the air being breathed by the diver
Calculate (t) and output. Here, the partial pressure of breathing nitrogen P
IN2 (t) is calculated by the following equation using the water pressure P (t). PIN2 (t) = 0.79 × P (t) [bar] ... (1) Note that “0.79” in the equation (1) is a numerical value indicating the ratio of nitrogen in the air. The respiratory gas nitrogen partial pressure storage unit 32 stores the value of the respiratory gas nitrogen partial pressure PIN2 (t) calculated by the respiratory gas nitrogen partial pressure calculation unit 31 according to the equation (1).

The internal nitrogen partial pressure calculation unit 64 absorbs nitrogen /
The nitrogen partial pressure in the body is calculated for each body tissue having a different discharge rate. For example, taking a certain tissue as an example, the nitrogen partial pressure PGT (tE) in the body absorbed / extracted during the dive time t = t0 to tE is calculated at the start of calculation (= t0).
The internal nitrogen partial pressure PGT (t0) of is calculated by the following equation. PGT (tE) = PGT (t0) + {PIN2 (t0) -PGT (t0)} * {1-exp (-K (tE-t0) / HT)} ... (2) Here, K is experimentally. HT is a constant to be obtained, and HT is a time until nitrogen is dissolved in each tissue to reach half of the saturated state (hereinafter, referred to as half-saturation time), and is a numerical value that differs depending on each tissue. This half-saturation time HT is variable according to the magnitude of PGT (t0) and PIN2 (t0), as will be described later. The measurement of time such as time t0 and time tE is managed by the time counting unit 68 shown in FIG. The body nitrogen amount calculation unit 60 repeatedly executes the above-described calculation of the body nitrogen partial pressure PGT (t) at a predetermined sampling cycle tE. At this time, the internal nitrogen partial pressure PGT (tE) calculated for each sampling cycle by the formula is supplied to the internal nitrogen discharge time deriving unit 37 and the dive time deriving unit 38, and the comparing unit 33 and the internal nitrogen partial pressure. It is supplied to the discharge time deriving unit 37 as PGT (t0). This means that PGT (tE) at the previous sampling is used as PGT (t0) in the equation.

Prior to the above calculation, the comparison unit 33
The respiratory air nitrogen partial pressure PIN2 (t0) stored in the respiratory air nitrogen partial pressure storage unit 32 is compared with PGT (t0) supplied from the internal nitrogen partial pressure storage unit 36, and the comparison result is a half saturation time. Output to the selection unit 74. Half saturation time selection unit 7
Reference numeral 4 stores two types of half-saturation time HT (half-saturation times HT1 and HT2 described later) that the internal nitrogen partial pressure calculation unit 35 should use for partial pressure calculation, and half-saturation is performed according to the comparison result by the comparison unit 34. The time HT1 or HT2 is selected and output to the internal nitrogen partial pressure calculator 35. Internal nitrogen partial pressure calculation unit 35
Uses the half-saturation time HT1 or HT2 selected by the half-saturation time selection unit 34 to calculate the internal nitrogen partial pressure PGT (tE) at the time t = tE by the following formula. (A)
In the case of PGT (t0)> PIN2 (t0) PGT (tE) = PGT (t0) + {PIN2 (t0) -PGT (t0)} * {1-exp (-K (tE-t0) / HT1)} ... (3)

(B) PGT (t0) <PIN2 (t0)
In the case of PGT (tE) = PGT (t0) + {PIN2 (t0) -PGT (t0)} × {1-exp (-K (tE-t0) / HT2)} (3 ') In addition, the above (3') ) And (3 ′), HT2 <HT
It is 1. Note that PGT (t0) = PIN2 (t
In the case of 0), the half-saturation time HT is preferably defined by the following equation. HT = (HT1 + HT2) / 2 (4) where PGT (t0)> PIN2 (t0) and P
The reason why the half-saturation time HT is different between GT (t0) <PIN2 (t0) will be described. First, PGT (t
When 0)> PIN2 (t0), nitrogen is discharged from the body, and conversely PGT (t0) <PIN2 (t0).
In the case of, it is the case where nitrogen is absorbed into the body. That is, since the discharge of nitrogen takes longer than the absorption of nitrogen, the half saturation time HT1 when nitrogen is discharged is set longer than the half saturation time HT2 when nitrogen is absorbed. By using the different half-saturation time HT at the time of discharge and at the time of absorption, the simulation of the amount of nitrogen in the body can be performed more strictly. Therefore, based on the nitrogen partial pressure calculated by the virtual in-vivo nitrogen calculating unit 80, it is possible to calculate a more accurate value when determining the non-decompression diving possible time and the in-vivo nitrogen discharging time, which will be described later. Becomes The body nitrogen amount calculating unit 60 can grasp the latest body nitrogen partial pressure of the diver who is diving by calculating the body nitrogen partial pressure PGT (t) as described above.

[5] Method of calculating non-decompressible dive time and in-vivo nitrogen excretion time In-vivo nitrogen partial pressure PGT (t) obtained as described above
E) and the respiratory gas nitrogen partial pressure PIN2 (tE) at t = tE calculated by the respiratory gas nitrogen partial pressure calculation unit 62, the non-decompression diving possible time and the body nitrogen discharging time are as follows. Is calculated in this way. The non-decompressible dive time is when the PGT (tE) calculated in the formula is Ptol indicating the allowable supersaturated nitrogen amount of each tissue (tE-t0).
It is calculated by obtaining At this time, since the present time is considered to be t0, as the PGT (t0) in the formula, the internal nitrogen partial pressure P determined by the internal nitrogen content calculating unit 60 is calculated.
GT (tE) is used, and the respiratory air nitrogen partial pressure PIN2 (tE) calculated by the respiratory air nitrogen partial pressure calculation unit 62 is used as PIN2 (t0). That is, tE−t0 = −HT × (ln (1-f)) / K (5) where f = (Ptol-PGT (tE)) / (PIN
2 (tE) -PGT (tE)). With this formula, all non-decompression diving possible times in each tissue are calculated, and the smallest value among them is the no-decompression diving possible time to be obtained. The no-decompression dive time calculated in this way is displayed in a diving mode, which will be described later. Next, a method of calculating the in-vivo nitrogen discharging time until the in-vivo nitrogen is discharged after the surface of the water is floated will be described.

To calculate the nitrogen excretion time in the body, the above-mentioned PGT (tE) = PGT (t0) + {PIN2 (t0) -PGT (t0)} * {1-exp (-K (tE-t0) / HT)} (6), it is sufficient to obtain tE such that PGT (tE) = 0, where t0 is when the water surface is floating. However, in the exponential function such as the above equation, if tE does not become infinity, PG
Since T (tE) = 0 does not hold, the following formula is used for convenience to calculate the in-vivo nitrogen excretion time tZ for each tissue. tZ = -HTxln (1-f) / K (7) Here, f = (Pde-PIN2) / (0.79-PIN2). Here, HT is the above-mentioned half-saturation time, and P
de is a nitrogen partial pressure (hereinafter referred to as an allowable nitrogen partial pressure) regarded as residual nitrogen discharge for each tissue, and these are all known values. PIN2 is a partial pressure of nitrogen in each tissue when the surface of the water is floating, and is a value calculated by the body nitrogen amount calculating unit 60. The tZ is calculated for each tissue by the above formula, and the largest value among them is the nitrogen excretion time in the body. The nitrogen excretion time in the body calculated in this way is
It is designed to be displayed in the surface mode as described later.

[6] Operation Next, the operation of the dive computer 1 having the above configuration will be described. FIG. 5 is a diagram schematically showing transitions of display screens in various operation modes of the dive computer. As shown in FIG. 5, the operation modes of the dive computer 1 include a time mode ST1 and a surface mode ST.
2, there are a planning mode ST3, a setting mode ST4, a diving mode ST5, a log mode ST6 and a FO ₂ setting mode ST7. Hereinafter, various operation modes will be described. The processing in these various operation modes is executed by the control / arithmetic unit 9 as described above. [6.1] Time Mode The time mode ST1 is an operation mode when the switch operation is not performed, the partial pressure of nitrogen in the body is in an equilibrium state, and the device is carried on land. In this time mode, as shown in FIG. 5 (see reference numeral ST1), the liquid crystal display panel 11 is
The current date, current time, and altitude rank are displayed. When the altitude rank = 0, the altitude rank is not displayed. Specifically, in FIG. 5, the current date is 1
It is February 5, which means that the current time is 10:06. Especially, the current time is displayed to the user by blinking a colon (:). Let me know.

In this time mode ST1, switch A
When is pressed, as shown in FIG. 9, the planning mode ST3
Move to. Also, if switch B is pressed, log mode ST
Go to 6. Further, if the switch B is kept pressed for a predetermined time (for example, 5 seconds) while the switch A is being pressed, the setting mode ST4 is entered. [6.2] Surface mode Surface mode ST2 is 48 from the last dive.
It is a mode when carrying on land until the time passes,
The dive computer 1 will
When the diving operation monitor switch 30 that was in the conductive state during diving becomes insulated, the surface mode ST is automatically set.
It is designed to move to 2. In the surface mode ST2, in addition to the current month and day, the current time and the altitude rank displayed in the time mode ST1, the body nitrogen excretion time is displayed in a countdown. However, when the time to be displayed as the nitrogen excretion time in the body reaches 0 hour 00 minutes,
After that, it is in a non-display state. Further, in the surface mode ST2, the elapsed time after the end of diving is displayed as the water surface rest time. This surface rest time 202
The water depth is 1.5 in the diving mode described later.
Timing is started with the next point that is shallower than the meter being the end of the dive, and no display is made when 48 hours have elapsed from the end of the dive. Therefore, in the dive computer 1, this surface mode ST2 is set on land until 48 hours have elapsed after the end of the dive, and thereafter, the mode is changed to the time mode ST1.

Specifically, in the surface mode ST2 shown in FIG. 5, it is displayed that the water surface rest time is 1 hour 13 minutes, that is, 1 hour 13 minutes has elapsed after the end of the dive. In addition, it is displayed that the amount of nitrogen absorbed in the body by diving performed so far corresponds to 4 marks in the nitrogen graph in the body, and from this state, excess nitrogen in the body is discharged until equilibrium is reached. It indicates that the time, that is, the nitrogen excretion time in the body is 10 hours and 55 minutes. When switch A is pressed in this surface mode ST2, as shown in FIG.
Move to T3. Further, when the switch B is pressed, the mode shifts to the log mode ST6. Further, if the switch B is kept pressed for a predetermined time (for example, 5 seconds) while the switch A is being pressed, the setting mode ST4 is entered. [6.3] Planning Mode The planning mode ST3 is an operation mode in which the maximum water depth and the dive time guideline for the next diving can be input before the diving. In this planning mode ST3, a water depth rank, a non-decompressible dive time, a water surface dwell time, and a body nitrogen graph are displayed. The display of the water depth rank changes in sequence at predetermined time intervals. Each depth rank 301 is, for example, 9m, 12m, 15m, 18m, 21m, 24m,
27m, 30m, 33m, 36m, 39m, 42m, 4
There are ranks of 5 m and 48 m, and the display is switched every 5 seconds. In this case, if the time mode ST1 shifts to the planning mode ST3, if there is no excessive nitrogen accumulation in the body due to past diving, that is, the planning of the first diving, the display mark of the in-vivo nitrogen graph 3 is 0, specifically, the water depth is 1 as shown in FIG. 5 (see ST4).
In the case of 5 m, the non-decompression dive time = 66 minutes is displayed. This means that no decompression diving is possible up to less than 66 minutes at a water depth of 12 m or more and 15 m or less.

On the other hand, if the transition from the surface mode ST2 to the planning mode ST3 is made, as shown in FIG. 5, it is the planning of repetitive diving in which excessive nitrogen is accumulated in the body due to the past diving, so Four marks are displayed on the nitrogen graph 203. For example, when the water depth is 15 m, it is displayed that the non-decompression diving possible time is 45 minutes. This means that no decompression diving is possible up to 45 minutes at a water depth of 12 m or more and 15 m or less. In addition, as described later, the airplane boarding setting mode ST
If the setting is made to display the dive time in consideration of boarding in 7 above, the dive time for safely boarding the airplane should be displayed instead of the above no-decompression dive display. become. In this planning mode ST3, the water depth rank 301 is from 9m to 48m
When switch A is pressed for 2 seconds or longer while the display is sequentially displayed, the surface mode ST is displayed as shown in FIG.
Move to 2. Further, after the water depth rank 301 is displayed as 48 m, the time mode ST1 or the surface mode ST2 is automatically entered. As described above, when the switch operation is not performed for a predetermined period, the surface mode ST2 or the time mode ST1 is automatically entered, so that it is not necessary to perform the switch operation each time, which is convenient for the diver. When switch B is pressed, log mode ST6
Move to.

[6.4] Setting Mode The setting mode ST4 is an operation mode for performing on / off setting of a warning alarm and setting of a safety level in addition to the setting of the current date and time. In the setting mode ST4, the safety level (not shown), alarm on / off (not shown), and altitude rank (not shown) are displayed in addition to the current month, day, current year, and current time. .
Of these display items, the safety level can be selected from two levels: a level for performing normal decompression calculation and a level for performing decompression calculation on the assumption that you will move to an altitude rank one rank higher after diving. It is possible. In addition, when there is excessive nitrogen accumulation in the body due to past diving, the nitrogen graph in the body is also displayed. The alarm on / off is a function for setting whether or not to sound various warning alarms from the notification device 13, and if the alarm is set to off, the alarm does not sound.
This is because it is convenient for a device such as an information processing device for divers that needs to avoid battery exhaustion as much as possible because it is possible to prevent the battery from being accidentally consumed due to power consumption due to an alarm. The alarm may be turned on when the ascending speed is violated or when decompression diving is performed.

In this setting mode ST4, every time the switch A is pressed, the setting item is changed in the order of hour, second, minute, year, month, day, safety level, alarm on / off, and the display of the setting target portion blinks. Becomes At this time, when the switch B is pressed, the numerical value or the character of the setting item is changed, and when the switch B is kept pressed, the numerical value or the character of the setting item is quickly changed. If switch A is pressed while the alarm on / off is blinking, the mode returns to the surface mode ST2 or the time mode ST1. Further, when the switches A and B are simultaneously pressed while the alarm on / off is blinking, the mode changes to the airplane boarding setting mode ST7. Further, both switches A and B have a predetermined period (for example,
1-2 minutes) If not operated, surface mode ST2
Alternatively, it automatically returns to the time mode ST1.

[6.5] Diving Mode Diving mode ST5 is an operation mode at the time of diving, and there is no decompression diving mode ST51 and current time display mode S.
T52, decompression diving display mode ST53, floating / sink management mode ST54, and stagnant floating / sink management mode ST55. In the no-decompression diving mode ST51, information necessary for diving such as the current water depth, dive time, maximum water depth, no-decompression diving time, internal nitrogen graph, and altitude rank is displayed. Figure 7
(B) is an explanatory view of an example of the display data in the no-decompression diving mode. As the display data, present water depth data, dive time data, maximum water depth data, non-decompressible dive time (NDL) data, body nitrogen content data, body oxygen content data, etc. are required. Specifically, -current water depth data = 10.0 m-diving time data = 12 minutes-maximum water depth data = 20.0 m-no decompression dive time (NDL) data = 42 minutes-internal nitrogen content data = bar graph 4 Individual lighting, internal oxygen content data = 2 bar graphs lighting, etc.

In the case of the above example, in the no-decompression diving mode ST51 shown in FIG.
Two minutes have passed, and now the diver is located at a depth of 15.0 m, which indicates that it is possible to continue non-decompression diving for another 42 minutes. In addition, it is displayed that the maximum water depth to date is 20.0 m, and the current body nitrogen amount is the body nitrogen graph 203.
It is displayed that the four marks in are at the lit level. In this diving mode ST5, the ascending levitation causes decompression sickness, so the levitation speed monitoring means operates. That is, every predetermined time (for example, 6
Every second), the current ascent velocity is calculated, and the calculated ascent velocity and the ascent velocity upper limit value corresponding to the current water depth are compared. If the calculated ascent velocity is faster than the ascent velocity upper limit value, the alarm device An alarm sound (levitation speed violation warning alarm) is emitted at a frequency of 13 to 4 [kHz] for 3 seconds, and "SLOW" and the current water depth are displayed on the liquid crystal display panel 11 so as to reduce the ascent speed. Alternately displayed at a cycle (for example, 1 second cycle) to warn the ascending speed. Further, the vibration generator 38 vibrates to warn the diver that the flying speed is violated. Then, when the ascending speed drops to a normal level, the ascending speed violation warning is stopped.

In the diving mode ST5, when the switch A is pressed, the current time display mode ST52 is entered only while the switch A is continuously pressed, and the current time and the current water temperature are displayed. Specifically, in the current time display mode ST52 shown in FIG. 5, the current time is 10
It is 18 minutes, and it is displayed that the water temperature is currently 23 [° C]. In this way, when there is a switch operation to that effect in the diving mode ST5, the current time and current water temperature are displayed for a predetermined period, so normally only the data necessary for diving is displayed in a small display screen. Even if configured, it is convenient because the current time and the like can be displayed as needed. Moreover, since the switch operation is used to switch the display even in the diving mode ST5 as described above, it is possible to display the information that the diver wants to know at an appropriate timing.

In the diving mode ST5,
When the water depth has risen to a depth lower than 1.5 m, it is considered that the diving has ended, and when the diving operation is conducted and the diving operation monitoring switch 30 is in the insulated state, the surface mode ST2 is automatically set. Transition. It should be noted that the diving results (diving date, dive time, maximum water depth, etc.) during this period are defined as one dive operation from when the water depth becomes 1.5 m or more until when the water depth becomes less than 1.5 m again. Various data) are stored in the RAM 54. In addition, if the above-mentioned ascending speed violation warning is issued twice or more in succession during the current diving, that fact is also recorded in the diving result. The dive computer of the present embodiment is configured on the premise of non-decompression diving. However, when it becomes necessary to perform decompression diving, an alarm to that effect is turned on to notify the diver, and the operation mode is set. The process proceeds to the decompression diving display mode ST53.

In the decompression diving display mode ST53,
The current water depth, dive time, internal nitrogen graph, altitude rank, decompression stop depth, decompression stop time, and total ascent time are displayed. Specifically, in the decompression diving display mode ST53 shown in FIG. 5, 24 minutes have elapsed from the start of diving and the water depth was 29.5 m.
Is displayed. Moreover, since the amount of nitrogen in the body exceeds the maximum permissible value and is dangerous, an instruction is displayed to ascend to a depth of 3 m while maintaining a safe ascent speed, and to stop decompression for 1 minute there. The diver will float after stopping decompression based on the display contents as described above, and while the decompression is being performed, the downward arrow indicates that the amount of nitrogen in the body tends to decrease.

In the floating / sink management mode ST54, the current water depth,
Information necessary for diving, such as dive time, ascent (dive) speed, ascent (dive) direction, and in-vivo nitrogen graph, is displayed.
Specifically, as shown in FIG. 5, the floating / sink management mode ST5
In No. 4, 12 minutes have passed since the dive was started, and it is displayed that the diver is currently located at a depth of 15.0 m. The current ascent (dive) speed is 0.2 m / s, and the ascending (dive) direction is
The downward direction, that is, the direction of diving is displayed, and further, the current amount of nitrogen in the body is displayed at a level at which four marks in the in-vivo nitrogen graph are lit (FIG. 5).
(See reference numeral ST51). This floating control mode ST54
In the above, ascending levitation causes decompression sickness, so the levitation speed monitoring means works. That is, the current levitation speed is calculated every predetermined time (for example, every 6 seconds), the calculated levitation speed is compared with the levitation reference speed corresponding to the current water depth, and the calculated levitation speed is higher than the levitation reference speed. When it is fast, the alarm device 13 issues an alarm sound (levitation speed violation warning alarm) at a frequency of 4 [kHz] for 3 seconds, and the liquid crystal display panel 11 displays “SLOW” so as to reduce the ascent speed. The current water depth display and the current water depth display are alternately displayed at a predetermined cycle (for example, a one-second cycle) to give a floating speed violation warning. Further, the vibration generator 38 vibrates to warn the diver that the flying speed is violated. Then, when the ascending speed drops to a normal level, the ascending speed violation warning is stopped.

In the stay floating / sink management mode ST55, information necessary for diving such as the current water depth, the target water depth, the ascending (dive) speed, the target ascending (dive) direction, the time to reach the target water depth, the internal nitrogen graph, and the altitude rank are displayed. To be done. For example, in the ups and downs management mode ST54 shown in FIG. 5, 12 minutes have passed since the dive was started, the diver is currently located at a depth of 15.0 m, and the target depth is 20.0 m. It is displayed that it is located at the depth. Also, the current ascent (dive) speed is 0.2 m /
s, the target ascending (dive) direction is downward, that is, the dive direction, and it is displayed that the time to reach the target water depth is 20 seconds. Further, the current amount of nitrogen in the body is indicated by mark 4 in the body nitrogen graph. The fact that the level is that the individual is lit is displayed (see reference numeral ST51 in FIG. 5). Even in this floating / sink management mode ST55, the floating / sink management mode ST
As in 54, the ascending speed monitoring means works.

[6.6] Log mode The log mode ST6 is a function of storing and displaying various data when the user dives deeper than 1.5 m for 3 minutes or more in the diving mode ST5. Such dive data is sequentially stored as log data for each dive, and a predetermined number (for example, 10 times) of dive log data is stored and retained. Here, when diving more than the maximum storage number is performed, it means that the latest log data is always stored by deleting the oldest data in order. It should be noted that even when diving more than the maximum number of storages, by setting in advance, it is possible to configure such that a part of the log data is retained without being deleted.

The log mode ST6 is changed to the time mode S
In T1 or surface mode ST2, it is possible to shift by pressing switch B. In the log mode ST6, the log data has two mode screens that switch every predetermined time (for example, 4 seconds). As shown in FIG. 5, the first log mode ST
At 61, the diving date, the average water depth, the diving start time, the diving end time, the altitude rank, and the body nitrogen graph at the time when the diving is finished are displayed. In the second log mode ST62, a log number indicating the number of times of diving on the day of diving, maximum water depth, dive time, water temperature at maximum water depth, altitude rank, and body nitrogen graph when diving is completed Is displayed. Specifically, as shown in FIG. 5 (see reference numeral ST6), in the state of altitude rank = 0, December 5
In the second dive of the day, diving starts at 10:07, ends at 10:45, and indicates that the dive was for 38 minutes. In the diving at this time, the average water depth was 14.6 m, the maximum water depth was 26.0 m, and the water temperature at the maximum water depth was 23 [° C]. After completion of the diving, nitrogen corresponding to four marks on the internal nitrogen graph was turned on. It means that the gas was absorbed in the body.

As described above, the log mode ST6 of this embodiment is used.
In the above, since various kinds of information are displayed while automatically switching between the two mode screens, the amount of information that can be substantially displayed can be increased even if the display screen is small, and visibility is not deteriorated. Further, in the log mode ST6, the display is sequentially switched from the new data to the old data each time the switch B is pressed, and after the oldest log data is displayed, the time mode ST1 or the surface mode S is displayed.
Move to T2. Even when a part of all log data has been displayed, it is possible to shift to the time mode ST1 or the surface mode ST2 by pressing the switch B for 2 seconds or more. Further, even if neither of the switches A and B is operated for a predetermined time (1 to 2 minutes), the operation mode is the surface mode S.
It automatically returns to T2 or time mode ST1. Therefore, the diver does not need to operate the switch, and the usability is improved. When switch A is pressed, the mode is changed to planning mode ST3.

[6.7] FO ₂ setting mode In the FO ₂ setting mode ST7, FO ₂ is displayed blinking at 2 [Hz], and FO ₂ can be set. Setting mode S
It is possible to shift to the FO ₂ mode ST7 from T4 by simultaneously pressing the switches A and B. In the FO ₂ mode ST7, the switch A is pressed to return to the setting mode ST4, and the switch B is pressed to set the FO ₂ . If you continue to press switch B, 8
Fast-forward display of [Hz] is displayed, but if the preset FO ₂ , such as 21 [%] or 32 [%], is reached, the display is fixed until the next key input. .

[7] Floating / Sinking Management Next, the floating / sinking management mode will be described. Ups and downs management unit 27
Determines whether it is in a floating state, a submerged state, or a state in which neither floating nor sinking occurs due to fluctuation per unit time from the pressure value or water depth value obtained by the water pressure / water depth measuring unit 10. Hereinafter, the floating state will be referred to as a positive buoyancy state, the submerged state will be referred to as a negative buoyancy state, and the state in which neither floating nor sinking will be referred to as a neutral buoyancy state. The floating / sink management unit 27 determines whether the positive buoyancy state, the negative buoyancy state, or the negative buoyancy state based on the difference between the previous measurement result and the current measurement result based on the water pressure or the depth value measured by the water pressure / depth measuring unit 10 every second. Make one of the neutral buoyancy decisions. However, since the dive computer is usually attached to the wrist, if you measure every second and update the display at the same time, and try to manage the ups and downs, there will always be a difference between the current water depth value and the water depth up to the previous time, and it will be stable. Since it is not possible to display and control the ups and downs,
Even if the measurement is performed every second, as in the case of ascending speed control,
The display and the float control are not updated. Next, the floating / sink management unit 27 displays to inform the diver of the floating / sinking state. The embodiment shown here is an example in which the floating / sink management function is incorporated and displayed in the dive computer, but it is also possible to equip the equipment (mask, cylinder, etc.) necessary for a diver other than the dive computer with the same function. You may

[7.1] Floating and Sinking Management Process FIG. 6 is a flowchart of the floating and sinking management process. First, the MPU 1 of the dive computer determines which operation mode the input key corresponds to (step M1). Next, the MPU 1 sets an operation mode corresponding to the determined input key and sets a flag for each function (step M2). Next, the CPU makes a mode determination to determine whether or not the diving mode is set (step M3). When it is determined that the mode is the non-diving mode in the determination in step M3 (step M3; No), the display process corresponding to the operation mode is performed (step M), and the process ends. When it is determined that the mode is the diving mode in the determination in step M3 (step M3; Yes), initial processing such as initialization of various data and initial display processing in the diving mode are performed (step M4). Next, the MPU 1 will perform the process in water at each measurement timing (step M5). Specifically, water depth measurement processing, body oxygen content calculation processing, body nitrogen content calculation processing,
Ascending speed warning processing, dive time calculation processing, water temperature measurement processing, etc. will be performed.

Next, the MPU 1 discriminates at every predetermined discrimination timing whether or not a change rate exceeding a predetermined reference change rate for the water depth change is detected (step M).
6). Here, the reference change rate corresponds to the maximum allowable change rate that can be regarded as a neutral buoyancy state. In the determination of step M6, when the rate of change in the water depth change at the predetermined determination timing exceeding the predetermined reference rate of change is not detected (step M6; No), it is determined that the buoyancy is neutral, that is, the state is stagnant. (Step S9),
The process proceeds to the buoyancy management process (step M11). In the determination of step M6, when the change rate exceeding the predetermined reference change rate is detected for the water depth change at the predetermined determination timing (step M6; Yes),
It is determined whether the rate of change is a positive (plus) value or a negative (minus) value (step M7). When the value of the rate of change detected in the determination of step M7 is a positive value (step M7; Yes), it is determined that the buoyancy is positive, that is, the floating state (step S8), and the buoyancy control process is performed (step S8). M11). When the value of the rate of change detected in the determination of step M7 is a negative value (step M7; No), negative buoyancy, that is,
If it is in the submerged state (step S10), the process proceeds to the buoyancy management process (step M11). In the buoyancy management process, the MPU 1 determines whether or not the current diving state (diving, ascending, dwelling) determined in the processes of steps M6 to M10 is an appropriate diving state, and If there is, an instruction for returning to the proper diving state is determined (step M11). This makes M
The PU 1 determines whether or not a warning should be issued (or a warning should be issued) according to the current diving state, and if necessary, notifies the diver of this fact via the notification unit 8 and performs a notification process. Perform (step M12). Further, the current diving state including the floating state is displayed on the information display section 28 (step M13).

FIG. 7A is an explanatory diagram of an example of display data in the floating / sink management mode. As the display data, current water depth data, diving pattern data (floating (descent) velocity data), current diving status data, in-vivo nitrogen content data, in-vivo oxygen content data, etc. are required. Specifically: ・ Current water depth data = 10.0 m ・ Diving pattern data = 0.2 m / s (ascent (dive) speed) ・ Current diving status data = dive status (↓) ・ Internal nitrogen content data = bar graph 4 lights, body oxygen content data = 2 bar graph lights, etc. FIG. 8 is an external view of the mask when the transmissive liquid crystal display device D as the information display unit 28 is mounted in the mask M. Further, FIG. 9 is an explanatory diagram of a display example when the floating / sink management screen is displayed on the transmissive liquid crystal display device D in the mask M. As shown in FIG. 9, on the transmissive liquid crystal display device D in the mask M, the current water depth value is 10.0 m and the diving pattern, that is, the dive speed = 0.2 m / s, is displayed numerically. Furthermore, the diving state and the diving state considering the diving pattern are graphically displayed (indicated by thick arrows in the figure) in association with the current water depth. Next, the retention / floating control process corresponding to the case of setting the desired water depth will be described.

[7.2] Residence Floating / Sinking Management Process FIG. 10 is a processing flowchart of the residence floating / sinking management process. First, the diver who is the user of the dive computer sets a desired stay position (step M14).
For example, the water depth is 15 m. In this case, the stay position can be set either on land or during diving. In this case, the water depth value may be directly input. Further, when it is desired to stay at the current water depth during diving, it is sufficient to give an instruction to select the current water depth. Along with this, MPU1 is based on the current water depth, water temperature, and diving history that affects the current diving (diving pattern including dive time and water depth history, body nitrogen accumulation amount, body oxygen accumulation amount, cylinder remaining amount, etc.). A future diving pattern including a plurality of water depth setting positions (passing target positions) from the current position to the retention position, that is, a ascending (dive) speed is calculated (step M15). Next MPU1
Calculates the direction (vertical direction) and the reaching distance of the current target water depth setting position as a reference (step M16). Further, the MPU 1 calculates the arrival time to reach the water depth setting position which should be the current target based on the arrival distance calculated in step M16 (step M
17). Subsequently, the MPU 1 determines whether the actual dive state is normal or the one that should give an alarm (or the one that should call attention) based on the water depth setting position that is the current target, and it is necessary. In response to this, a notification process is performed to notify the diver of that fact by the warning display unit via the notification unit 8 (step M18).

Further, the current diving state including the floating state is displayed on the information display section 28 (step M19).
FIG. 7C is an explanatory diagram of an example of the display data in the stay floating control mode. As the display data, present water depth data, stay position data, diving pattern data (floating (dive) speed data), direction data, arrival time data, body nitrogen content data, body oxygen content data, and the like are required. Specifically, -current water depth data = 10.0 m-stagnation position data = 15 m-diving pattern data = 0.2 m / s (ascent (dive) speed) -direction data = dive direction (↓) -arrival time data = 20 seconds-Body nitrogen content data = 4 bar graphs lit-Body oxygen content data = 2 bar graphs lit.

FIG. 11 is an explanatory diagram of a display example when the staying floating control screen is displayed on the transmissive liquid crystal display device D in the mask M. In the case of the data shown in FIG. 7 (c), as shown in FIG. 11, the current water depth value is 10.0 m, the dive is 5.0 m further to the retention state position, the arrival time is 25 seconds, and the dive pattern is 0.2 m / s. And the like are displayed on the stay floating control screen of the transmissive liquid crystal display device D in the mask M. Further, on the stay floating / sink management screen of the transmissive liquid crystal display device D, a graphical representation (indicated by a thick arrow in the figure) of the diving state in consideration of the diving situation and diving pattern in association with the current water depth is displayed.

[8] Modified Example [8.1] First Modified Example In the above description, the water pressure value or the water depth value (detected value) at the current measurement timing and the previous measurement timing is used when determining the floating / sinking state. The submersible's ups and downs were determined and managed based on the above, but the submersible's ups and downs should be determined and managed based on the change state of the detected value at multiple measurement timings including this measurement timing. It is also possible to In this case, it is also possible to weight the detection value of each time and increase the weight of the detection value of the current measurement timing.

[8.2] Second Modification In the above embodiment, it is assumed that the programs for performing the various operations described above are stored in the ROM 6 in advance. However, the present invention is not limited to this, and a personal computer or server computer (not shown) and a dive computer are connected via a communication cable or a network,
The program may be downloaded from the personal computer or the server computer to the dive computer. In this case, the program is stored in a rewritable non-volatile memory (not shown) in the dive computer. And M
The PU 1 may read the program from this non-volatile memory and execute it.

[0052]

According to the present invention, by incorporating the floating / sinking control in the water, the user can easily grasp whether the user is in the stagnant state, the submerged state or the floating state, and it is dangerous to see the surrounding scenery. It can be used as a guide when you want to keep the dive in order to prevent continued dive or to reduce the pressure, and you can safely dive. In addition, it is difficult for beginners to wear diving equipment underwater and freely dive, but if you are training to get up and down, exceed the water depth you want to stay, or make a sudden ascent, you will be notified at the same time as the current You can know the diving situation.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a dive computer according to an embodiment of the present invention.

FIG. 2 is a detailed configuration block diagram of a dive computer.

FIG. 3 is a functional block diagram for realizing a flying speed monitoring function.

FIG. 4 is a functional configuration block diagram for realizing a nitrogen amount calculation function of the dive computer.

FIG. 5 is a diagram schematically showing transitions of display screens in various operation modes of the dive computer.

FIG. 6 is a processing flowchart of a floating / sink management process.

FIG. 7 is an explanatory diagram of an example of display data in each mode of a floating / sink management mode, a no-decompression diving mode, and a staying floating / sink management mode.

FIG. 8 is an external view of a mask when a transmissive liquid crystal display device as an information display unit is mounted in the mask.

FIG. 9 is an explanatory diagram of a display example when a floating / sink management screen is displayed on the transmissive liquid crystal display device in the mask.

FIG. 10 is a processing flowchart of stay floating control processing.

FIG. 11 is an explanatory diagram of a display example when a staying floating control screen is displayed on the transmissive liquid crystal display device in the mask.

[Explanation of symbols]

1 ... MPU, 2 ... Display part, 3 ... Timekeeping part, 4 ... Pressure sensor, 5 ... Analog / digital converter, 6 ... ROM, 7
... RAM, 8 ... Notification unit, 9 ... Control / calculation unit, 10 ... Water pressure / water depth measurement unit, 11 ... Switch operation unit, 12 ... Diving operation monitoring switch, 13 ... Notification device, 14 ... Vibration generation device,
15 ... Liquid crystal driver, 16 ... Liquid crystal display panel, 17 ... Control circuit, 18 ... Time counter, 19 ... Dividing circuit, 20
... oscillation circuit, 21 ... amplification circuit, 22 ... levitation speed measurement unit,
23 ... Ascending speed reference data, 24 ... Ascending speed violation determination section, 25 ... Diving result storage section, 26 ... Water temperature measuring section, 27 ...
Floating and sinking management unit, 28 ... Information display unit, 29 ... Notification unit, 30 ...
Warning display unit, 31 ... Respiratory gas nitrogen partial pressure calculation unit, 32 ... Respiratory gas nitrogen partial pressure storage unit, 33 ... Comparison unit, 34 ... Half saturation time selection unit, 35 ... Body nitrogen partial pressure calculation unit, 36 ... Body nitrogen Partial pressure storage unit, 37 ... Body nitrogen partial pressure discharge time deriving unit, 38 ... Divable time deriving unit, PW ... Power supply unit.

Claims (19)

[Claims] 1. A floating / sinking state is determined by detecting a water pressure or a water depth at a predetermined measurement interval, and determining a floating / sinking state of a diver based on a change state of a detected value at a plurality of measuring timings including a current measuring timing. An information processing apparatus for divers, comprising: a floating / sinking management unit for acquiring and managing information; and an information notifying unit for notifying information on the floating / sinking state. 2. A water pressure or a water depth is detected at a predetermined measurement interval or a dive time, and a difference between the water pressure and the water depth is set to detect a floating / sinking state of a diver. An information processing device for divers, comprising: a floating / sink management unit for managing the divers; and an information notification unit for notifying information about the floating / sinking state of the diver. 3. The divers information processing apparatus according to claim 1, wherein the floating / sink management unit acquires a floating / sinking direction and a floating / sinking speed as the information on the floating / sinking state. Processing equipment. 4. The information processing apparatus for divers according to claim 3, wherein the information notifying means displays by a letter, a figure or a number whether the staying state, the submerged state or the floating state. Information processing device for divers. 5. The information processing apparatus for divers according to claim 3, wherein the information notifying means includes notifying means for notifying a staying state or a non-staying state. 6. The information processing apparatus for divers according to claim 3, wherein the floating / sink management unit includes a setting unit that sets a water depth value for which a staying state is desired to be set as a set staying water depth value. An information processing device for divers characterized by the above. 7. The information processing apparatus for divers according to claim 6, wherein the information notifying unit displays information related to a difference between the set accumulated water depth value and an actual water depth value. apparatus. 8. The information processing apparatus for divers according to claim 6 or 7, wherein the floating / sink management unit includes a dive pattern calculation unit that calculates a dive pattern up to a water depth corresponding to the set accumulated water depth value. An information processing apparatus for divers, characterized in that the information notifying means displays to notify the diving pattern. 9. The information processing apparatus for divers according to claim 6, wherein the floating / sink management unit calculates a dive time to reach a water depth corresponding to the set accumulated water depth value. An information processing apparatus for divers, comprising: time calculating means, wherein the information notifying means displays to notify the diving time. 10. The diver's information processing device according to claim 1, wherein the floating / sink management unit counts a measurement interval and a dive time, and a water pressure for measuring a water pressure or a water depth. An information processing device for divers, characterized by comprising a water depth measuring unit. 11. The floating / sinking state is determined by detecting the water pressure or the water depth at a predetermined measurement interval, and determining the floating / sinking state of the diver based on the change state of the detected value at a plurality of measurement timings including the current measurement timing. A method of controlling an information processing device for divers, comprising: a floating / sinking management process of acquiring and managing information; and an information notification process of notifying information on the floating / sinking state. 12. The water pressure or water depth is detected at a predetermined measurement interval or dive time, and the difference is calculated with respect to a preset water pressure value or water depth value to detect the submerged person's ups and downs. A method for controlling an information processing device for divers, comprising: a floating / sinking management process for managing; and an information notifying process for displaying information on the floating / sinking state of the diver. 13. The control method of the information processing apparatus for divers according to claim 1 or 2, wherein the floating / sinking management process acquires a floating / sinking direction and a floating / sinking speed as the information on the floating / sinking state. A method for controlling an information processing device for divers. 14. The method for controlling an information processing apparatus for divers according to claim 13, wherein the information notifying step is to display by a letter, a figure or a number whether the state is a staying state, a submerged state or a floating state. A control method of a characteristic information processing device for divers. 15. The divers information control method according to claim 13 or 14, further comprising a setting process for setting a water depth value for which a retention state is desired to be set as a set retention water depth value. Method for controlling information processing device for personal computer. 16. The control method of the information processing apparatus for divers according to claim 6, wherein the floating / sink management process corresponds to information about a difference between the set accumulated water depth value and an actual water depth value, and the set accumulated water depth value. Information about the diving pattern to reach the water depth, at least one of the information about the diving time to reach the water depth corresponding to the set accumulated water depth value is acquired, and the information notification process displays the acquired information. A control method of a characteristic information processing device for divers. 17. A control program for causing a computer to control an information processing device for divers, the step of detecting water pressure or water depth at a predetermined measurement interval, and a plurality of measurement timings including a current measurement timing. A control including: a step of determining the floating / sinking state of the diver based on the change state of the detected value, acquiring and managing information on the floating / sinking state, and a step of notifying the information on the floating / sinking state. program. 18. A control program for causing a computer to control an information processing device for divers, the step of detecting water pressure or water depth at a predetermined measurement interval or diving time, and a preset water pressure value or setting. A control program comprising: a step of calculating a difference between water depth values to detect and manage a floating / sinking state of a diver; and a step of displaying information on the floating / sinking state of the diver. . 19. A computer-readable recording medium having the control program according to claim 17 or 18 recorded therein.