JP3353341B2 - Electronic depth gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic depth gauge suitable for use in diving by sucking so-called compressed air composed of oxygen and inert gas (including nitrogen gas).

[0002]

2. Description of the Related Art Conventionally, a decompression table prepared by the United States Navy or the like is used to calculate a decompression depth based on a maximum water depth and a dive time. , The depth when maintaining a certain depth) and decompression stop time (time during which ascent stops and stays at the above decompression depth)
Electronic depth gauges that digitally display these are being put to practical use. Furthermore, from the maximum water depth and dive time,
An electronic depth gauge with the function of obtaining and displaying the remaining time that can ascend without decompression (remain at a predetermined depth to avoid a rapid decrease in water pressure), that is, the no-decompression limit remaining time, is also proposed. Have been.

[0003] Generally, when a diver wants to ascend without decompression when diving, he or she recognizes the no-decompression limit remaining time using the above-mentioned electronic depth gauge, and determines the no-decompression limit remaining time. Ascending before reaching 0, on the other hand, even when the no-decompression limit remaining time has become 0, when ascending, it ascends at the specified decompression depth based on the data indicated by the electronic depth gauge as described above. Is stopped and depressurization is performed by staying for the decompression stop time at the decompression depth.

[0004] By the way, in the above-mentioned electronic depth gauge,
The dive limit is becoming narrower than necessary, as it seeks decompression data assuming maximum safety and staying at the maximum depth during the dive period. In view of this point, a multi-level electronic depth gauge that calculates the amount of nitrogen at each tissue site in the human body in real time and obtains and displays data for proper decompression based on the calculated amount has been announced. I have. That is, the multi-level electronic depth gauge measures the half-saturation time (that is, 50% of the saturation amount) in consideration of the fact that the speed at which nitrogen dissolves and the speed at which nitrogen is discharged differ depending on each tissue site in the human body. ), And the amount of each nitrogen is calculated in real time using the data such as the above half-saturation time. For this type of device, some devices of this type display the shortest non-decompression limit remaining time among the non-decompression limit remaining times of each tissue.

[0005]

However, in the above-mentioned electronic water depth gauge, that is, an electronic water depth gauge of a multi-level system that displays only the shortest non-decompression limit remaining time, the current situation (water depth) is the non-decompression limit remaining. Are you lengthening the time?
It is not possible to immediately know whether the time is shortened, and it is inconvenient to wait for a while and determine whether or not the no-decompression limit remaining time actually increases or decreases. The present invention has been made in view of the above-described circumstances, and provides an electronic water depth gauge that can immediately recognize whether the current situation (water depth) is lengthening or shortening the no-decompression limit remaining time. With the goal.

[0006]

In order to achieve the above object, the present invention provides a display means for displaying whether the tissue having the shortest no-reduced pressure remaining time is absorbing or discharging inert gas. Was.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments shown in the drawings. In this embodiment, the present invention is applied to an electronic depth gauge for diving performed by sucking compressed air containing nitrogen as an inert gas. FIG. 1 shows a circuit configuration of the present embodiment. That is, in this embodiment,
Other circuit units are connected to the CPU 1 and the like. The CPU 1 is a circuit unit that processes and processes the transmitted data, sends the data, sends signals to each circuit unit, and controls them.

The oscillating circuit 2 is a circuit that constantly sends out a signal of a constant frequency. The frequency dividing circuit 3 is a circuit section that divides the frequency of the signal from the oscillation circuit 2 to a predetermined frequency and sends the frequency to the clock circuit 4 and the AND gate 6. The clock counting circuit 4 counts the signal from the frequency dividing circuit 3 to obtain the current time, sends this to the CPU 1, and outputs a three-second signal, which is a measurement timing signal such as water pressure, every three seconds. This is a circuit for sending to the CPU 1.

The RS flip-flop 5 is a circuit that receives a set signal or a reset signal from the CPU 1, enters a set state or a reset state, and sends out an output Q in the set state. The AND gate 6 is opened by the output Q from the RS flip-flop 5 to
Is a circuit for supplying a signal of a predetermined frequency from the to the dive time counting circuit 7. The dive time counting circuit 7 counts the signal of the predetermined frequency transmitted through the AND gate 6, measures the elapsed time, and uses the measured elapsed time as the dive time.
This is a circuit section that sends the signal to PU1 and clears the elapsed time measured when receiving a clear signal from CPU1.

[0010] The RAM 8 has a configuration described below.
A circuit unit that stores data from the CPU 1 and sends the stored data to the CPU 1 under the control of U1. FIG. 2 shows the configuration of the RAM 8. The mode register M is a register for specifying a mode.
When 0 is set, the clock mode when this electronic depth gauge is used as a clock is specified. When 1 is set, the water depth when this electronic depth gauge is used as a depth gauge is specified. Specify the metering mode. Diving flag S
F is a flag that is set to 1 when the water depth is 1.5 m or more, that is, when a substantial dive is being performed. The organization designation register i is the organization number 1 of the human body
6 is a register for designating any of the tissues of the human body given. For example, when the tissue number 2 is set, the tissue of the tissue number 2 is designated. The tissues of the human body are classified according to the half-saturation time, as described later. The nitrogen partial pressure registers Q1 to Q6 are registers in which the nitrogen partial pressures of the tissues of tissue numbers 1 to 6, respectively, are set. The no-decompression limit remaining time register MT is a register in which the no-decompression limit remaining time of each tissue is sequentially set.
The shortest non-decompression limit remaining time register TA is a register in which the shortest of the six non-decompression limit remaining times of the tissues is set. The non-decompression diving attention tissue register X is a register in which the tissue number of the tissue having the shortest non-decompression limit remaining time, that is, the tissue to which the most attention is required in diving that does not require decompression is set. The decompression depth register GS is a register in which the decompression depth of each tissue is sequentially set. The decompression stop time register GT is a register in which the decompression stop time of each tissue is sequentially set. The deepest decompression depth register SM is a register in which the deepest decompression depth is set. The deepest decompression depth stop time register TM is a register in which the decompression stop time at the deepest decompression depth (when there are two or more tissues having the deepest decompression depth, the longest decompression stop time is set). The depressurized dive caution tissue register Y stores a tissue to be the most cautious for avoiding decompression sickness, that is, a tissue with the deepest decompression depth (the decompression depth is the lowest) when a decompression diving (a dive requiring decompression during ascent) is performed. When there are two or more deep tissues, this is a register in which the tissue number of the tissue having the longest decompression stop time is set.

The ROM 9 stores a program for various processes as an electronic depth gauge, a fixed safety allowable amount of nitrogen during ascent, and the like, and sends them to the CPU 1 under the control of the CPU 1. Department. For example, a decompression table of the United States Navy is stored as the allowable safety amount of nitrogen stored in the ROM 9, and the decompression table is classified by the half-saturation time, for example, as shown in FIG. M value is stored for each tissue of the human body
In the figure, for example, the organization of organization number 2 is displayed as M-2). Here, the M value is a permissible partial pressure of nitrogen that indicates whether or not nitrogen is dissolved in each tissue of the human body to the extent that it is safe to ascend within a prescribed ascent speed. The value at every 10 feet of water depth is stored. (M value is pressure unit b
ar, and in the figure, for example, the M value at a water depth of 10 feet is indicated as M (10)). In other words, if the nitrogen partial pressure of a certain tissue exceeds the M value at a predetermined water depth of the tissue due to diving, it must stay at that depth until the nitrogen partial pressure falls below the M value.

The pressure sensor 10, the amplification circuit 11, and the A /
The D conversion circuit 12 is a circuit unit that starts upon receiving a start signal from the CPU 1, and the pressure sensor 10 sends an analog electric signal of a level corresponding to the environmental pressure (pressure obtained by adding water pressure to atmospheric pressure) to the amplifier circuit 11. Then, the amplifier circuit 11 amplifies the analog electric signal and supplies the amplified analog electric signal to the A / D conversion circuit 12.
The D conversion circuit 12 converts the amplified analog electric signal into a digital electric signal and provides the digital electric signal to the CPU 1. The switch unit 13 includes various switches, and when any one of these switches is operated, a corresponding switch input is sent to the CPU.
1 is a circuit section to be sent out.

The display drive circuit 14 is a circuit section for driving the display section 15 and displaying various data sent from the CPU 1 thereon. The display unit 15 includes a digital display unit 15a for digitally displaying the water depth and the like, and a graph display unit 15b for graphically displaying the no-decompression limit remaining time and the like, as shown in FIG. Display 1
5b is provided with bar graph displays 16a to 16b, and below them, the half-saturation time of the tissue whose tissue number is set in the non-decompression diving attention tissue register X or the decompression diving attention tissue register Y is displayed. Half-saturation time display 1
6d, and time scales 5, 10, 20,..., 100 in units of minutes and scales 0, 20 in units of minutes along the vertical axis of the bar graph on the left and right sides of the graph display section 15b. , 40... 100 are printed and displayed.

The operation of the embodiment constructed as described above will be described below. FIG. 4 is a general flowchart showing an outline of the operation of the present embodiment. That is, in step S1, it is determined whether any switch of the switch unit 13 has been operated and a switch input has been sent. If no switch input has been sent, the process directly proceeds to step S8, but the switch input is not sent. If yes, the process proceeds to step S2, and it is determined whether the mode switch SM has been operated. And what is operated is the mode switch S
If it is determined that it is not M, the process proceeds to step S7 to execute a switch process according to the transmitted switch input, and then proceeds to step S8. On the other hand, in step S2, the operated switch is the mode switch SM.
If it is determined that the clock mode has been reached, the process proceeds to step S3, where it is determined whether the value of the mode register M is 0 and the watch mode is set. If the watch mode is set, the process proceeds to step S4 and the value of the mode register M is set to 1 Then, the process proceeds to step S8. When it is determined in step S3 that the value of the mode register M is not 0 but 1 and that the mode is the depth gauge mode, the process proceeds to step S5, and whether the diving flag SF is 0, that is, the dive is performed. It is checked whether the vehicle is not diving. If the vehicle is not diving, the mode register M is set to 0 in step S6 to set the clock mode, and then the process proceeds to step S8. If it is determined in step 1 that the vehicle is diving, the process directly proceeds from step S5 to step S5.
Proceed to 8.

In step S8, it is checked whether or not the value of the mode register M is 1 and the mode is the depth gauge mode. If the mode is the depth gauge mode, the flow proceeds to step S9 to execute a measuring process described later. When the measurement process in step S9 is completed, or when it is determined in step S8 that the value of the mode register M is 0 instead of 1 and the watch mode is set, the process proceeds to step S10, and various data are displayed on the display unit 15. Then, the process returns to step S1.

FIG. 5 is a flowchart showing in detail the measurement processing in step S9 in FIG. That is, in the measuring process, first, in step S15, the clock counting circuits 4 to 3
It is determined whether the 3-second signal transmitted every second has been transmitted. If the 3-second signal has not been transmitted, the measurement process ends. If the 3-second signal has been transmitted, the process proceeds to step S16. Proceed to. In this step S16, the pressure sensor 1
0, a start signal is sent to the amplification circuit 11 and the A / D conversion circuit 12, and the pressure is detected. Then, in step S17, the water depth is calculated from the detected pressure. The calculation of the water depth in this case is based on a calculation method conventionally performed by a water depth gauge.

After calculating the water depth, the process proceeds to step S18, and it is determined whether the calculated water depth is 1.5 m or more. When the water depth is 1.5 m or more, it is determined that a full-scale dive is being performed, and step S1 is performed.
The program proceeds to 9 where it is determined whether the value of the dive flag SF is 0. If the value is 0, the start of the dive is stored with the value of the dive flag SF set to 1 in step S20. Next, in step S21, a set signal is sent to the RS flip-flop 5, the set signal is set, the AND gate 6 is opened, a signal of a predetermined frequency from the frequency dividing circuit 3 is sent to the dive time counting circuit 7, and the dive time counting circuit is sent. The measurement of the dive time by 7 is started. When the process in step S21 is completed, or in step S19, the value of the diving flag SF is not 0, but 1
If it is determined that the data has been set, the process proceeds to step S22, where an initial setting process for clearing a register in which unnecessary data is set is executed, and in step S23, 1 is set in the organization designation register i, and The organization of the organization number 1 (that is, the organization indicated as M-1 in FIG. 3) is designated.

After designating the tissue of the tissue number 1 as described above, the process proceeds to step S24, and the nitrogen of the tissue designated by the tissue designation register i (in this case, the tissue of the tissue number 1 as described above) Calculate the partial pressure. in this case,
The calculation is performed by the following equation. Qi = Pi + (N-Pi) (1-0.5 ^{(T / Hi)} ) (1) where i is the value of the organization specifying register i, and the value of the organization specified by the organization specifying register i Although it is shown that these are various data, in this embodiment, i = 1, 2,.
... takes values up to 6. That is, Qi is the current nitrogen partial pressure (bar) of the tissue of the tissue number i, Pi is the nitrogen partial pressure (bar) before T time (minute) of the tissue of the tissue number i, and N is the respiratory gas pressure at the current environmental pressure. Nitrogen partial pressure (bar), Hi is the half-saturation time (minute) of the tissue of tissue number i. As described above, since the measurement is performed every three seconds upon receiving the three-second signal (see step S15), Pi is the nitrogen partial pressure of the tissue three seconds before. Further, the nitrogen partial pressure N at the current environmental pressure is obtained by multiplying the environmental pressure (atmospheric pressure + water pressure) by the ratio of nitrogen in the absorption gas.

After the process of step S24 is completed, the process proceeds to step S25, in which the tissue number 1 calculated in step S24 is stored in the nitrogen partial pressure register designated by the tissue designation register i, ie, in this case, the nitrogen partial pressure register Q1. Set the partial pressure of nitrogen in the tissue. Next, step S26
Then, it is checked whether the nitrogen partial pressure of the tissue of the tissue number 1 set in the nitrogen partial pressure register Q1 is larger than the M value of the tissue of the tissue number 1 at a depth of 10 feet, that is, 3.606 bar (see FIG. 3). Then, when it is determined that the nitrogen partial pressure of the tissue of tissue number 1 set in the nitrogen partial pressure register Q1 is not larger, the process proceeds to step 31 and executes the below-described pressure reduction unnecessary process. Proceed to S29. On the other hand, when it is determined in step S26 that the nitrogen partial pressure of the tissue of the tissue number 1 is higher, the process proceeds to step S27, where the diving type flag MF
Is set to 1 to memorize that the decompression is necessary for at least one tissue. Then step S
In step 28, a pressure reduction necessity process described later is executed, and thereafter, the process proceeds to step S29. In step S29, it is determined whether the value of the organization designation register i is 6. In this case, the value of the organization designation register i is 1 and is not 6, so the process proceeds to step S30, and the organization designation register i Is set to 2 which is larger by 1 and then returns to step S24. Hereinafter, the processing of steps S24 to S30 is repeated, and the same processing is performed for each organization of organization numbers 2 to 6. Then, when the processing for the organization with the organization number 6 is completed, the fact is detected in step S29 because the value of the organization designation register i is 6, and the measurement processing is completed and the display processing (FIG. 4) Proceed to step S10).

On the other hand, at step S18 in FIG.
If it is determined that it is not more than 5 m, it is determined that the surface has reached the surface of the water, and it is determined in step S33 whether the value of the dive flag SF is 1, that is, whether or not the dive has been performed until then.
In step S34, the value of the dive flag SF is set to 0 in step S34, a reset signal is sent to the RS flip-flop 5 in step S35, and the dive time counting circuit 7 stops counting the dive time in the RS flip-flop 5 in a reset state. I do.

FIG. 6 is a flow chart showing in detail the pressure reduction unnecessary processing (step S31) in the measurement processing (FIG. 5). In this process, first, in step S40
The non-decompression limit remaining time MTi for the tissue designated by the tissue designation register i (the remaining time up to the limit point at which the ascent can be performed directly without the need for decompression as described above.
That is, from that point on, the nitrogen partial pressure of the tissue becomes 10
The M value in feet, i.e. the time to exceed M (10) i) is calculated. In this case, no decompression limit remaining time MTi
Is calculated by the following equation. MTi = −Hi × log {(N−M (10) i) / (N−Qi)} / log2 (2) Equation (2) is substantially the same as equation (1). In the above equation, Qi is set to M (10) i, T is set to MTi, Pi is set to Qi, and MTi is solved.

After calculating the non-decompression limit remaining time MTi in the process of step S40, the process proceeds to step S41.
The calculated no-decompression limit remaining time MTi is stored in the no-decompression limit remaining time register MT of the RAM 8. Next, in step S42, it is determined whether or not the value of the organization designation register i is 1, and if it is 1, the process proceeds to step S43, where the RAM
In the minimum non-decompression limit remaining time register TA of No. 8, the non-decompression limit remaining time stored in the no-decompression limit remaining time register MT in step S41 is set. Then step S
In step 44, the value of the tissue designation register i, that is, the tissue number of the tissue in which the no-decompression limit remaining time is set in the shortest no-decompression limit remaining time register TA is set in the no-decompression dive attention tissue register X. On the other hand, when it is determined in step S42 that the value of the organization designation register i is not 1, the process proceeds to step S45. In step S45, the no-decompression limit remaining time stored in the no-decompression limit remaining time register MT in step S41 is transferred to the shortest no-decompression limit remaining time register TA and stored in the no-decompression limit remaining time (TA). That is, it is determined whether the time is shorter than the non-decompression limit remaining time for other tissues). If it is shorter, the process proceeds to step S43, and the shorter no-decompression limit remaining time, that is, the no-decompression limit remaining time stored in the no-decompression limit remaining time register MT, is stored in the shortest no-decompression limit remaining time register TA. Update time. Thereafter, the process proceeds to step S44, and the value of the tissue designation register i is set in the non-decompression dive caution tissue register X in the same manner as described above. As described above, in the decompression unnecessary processing, the non-decompression limit remaining time is calculated for the tissue that does not require decompression, and the no-decompression limit remaining time is calculated for the tissue that has the shortest time (that is, the remaining time is short). The time is retrieved and set in the shortest non-decompression limit remaining time register TA.

FIG. 7 is a flow chart showing in detail the pressure reduction required processing (step S28) in the measurement processing (FIG. 5). That is, in the depressurization required process, first, the decompression depth is obtained in step S50. In this case, one of the nitrogen partial pressure registers Q1 to Q6 designated by the tissue designation register i, that is, the nitrogen partial pressure stored in the nitrogen partial pressure register Qi, is sequentially converted into an M value at a water depth of 20 feet (ie, M (20) i), the M value at a depth of 30 feet (ie, M (30) i),..., And the largest value that does not exceed the nitrogen partial pressure stored in the nitrogen partial pressure register Qi M values (ie, M (10) i, M (20) i, M (30)
i, M (40) i,...), and the water depth associated with the obtained M value is defined as the decompression depth. Next, in step S51, the depressurized depth register GS of the RAM 8 is stored in the step S51.
The decompression depth obtained in step 50 is set, and in step S52, the decompression stop time GTi at the above-mentioned decompression depth is calculated. In this calculation, the following equation is used. GTi = −Hi × log {(NM (x) i) / (N−Qi)} / log2 (3) This equation (3) is essentially the same as the above equation (2). ,
M (x) i is an M value corresponding to the decompression depth.

After ending the process of step S52, the process proceeds to step S53, where the decompression time register GT stores
The decompression stop time calculated in step S52 is stored,
Next, in step S54, the value of the organization designation register i is 1
Determine if it is. If the value is 1, the process proceeds to step S55, and the reduced pressure depth set in the reduced pressure depth register GS in step S51 is set in the deepest reduced pressure depth register SM. In the next step S56,
The decompression stop time stored in the decompression time register GT in step S53 is changed to the deepest decompression depth stop time register T.
Set to M. In the next step S57, the value of the tissue designation register i, that is, 1 is set in the decompression dive attention tissue register Y, and the decompression stop time set in the deepest decompression depth stop time register TM is the tissue of the tissue number 1 I remember that

On the other hand, if it is determined in step S54 that the value of the organization designation register i is not 1, the process proceeds to step S6.
0, is the decompression depth by the current calculation set in the decompression depth register GS larger (deeper) than the decompression depth of other tissues already calculated and set in the deepest decompression depth register SM? Judge. When the decompression depth set by the current calculation set in the decompression depth register GS is larger, the process proceeds to step S55, and the decompression depth of the deepest decompression depth register SM is updated with the decompression depth of the decompression depth register GS. Further, step S56
Then, the decompression stop time of the deepest decompression depth stop time register TM is updated with the decompression stop time calculated this time stored in the decompression time register GT. In the next step S57, the value of the tissue designation register i at that time is updated. Set in the decompression dive attention tissue register Y. Also, the above step S60
When it is determined that the decompression depth set by the current calculation set in the decompression depth register GS is not larger than the decompression depth of the other tissues set in the deepest decompression depth register SM, step S61 is performed. To determine whether the two decompression depths are equal. When they are equal, it is determined whether the decompression stop time by the present calculation stored in the decompression time register GT is longer than the decompression stop time already calculated and set in the deepest decompression depth stop time register TM, If it is longer, the process proceeds to step S56, and in consideration of safety, the decompression stop time of the deepest decompression depth stop time register TM is updated with the longer decompression stop time stored in the decompression time register GT. In S57, the value of the tissue designation register i at that time is set in the decompression dive caution tissue register Y, and the tissue number of the tissue relating to the longest decompression stop time stored in the deepest decompression depth stop time register TM is stored. As described above, in the decompression required processing, when a tissue requiring decompression is found, the required decompression depth and decompression stop time are obtained for each tissue, and the deepest decompression depth is set in the deepest decompression depth register SM. The decompression stop time at the decompression depth (when the decompression depths are equal for two or more tissues and they are the deepest decompression depths, the longer decompression stop time of the decompression stop times) is set to the deepest decompression time. Depth stop time register TM
And the tissue number of the tissue related to the decompression stop time set in the deepest decompression depth stop time register TM is set in the decompression dive attention tissue register Y.

FIG. 8 shows the display process (step S) of FIG.
It is a flowchart which shows 10) in detail. That is, in this display processing, first, in step S65, it is determined whether the value of the mode register M is 0 and the watch mode is set, and if the watch mode is set, the process proceeds to step S6.
In step 6, the current time from the clock counting circuit 4 is displayed on the digital display unit 15a of the display unit 15. On the other hand, if it is determined in step S65 that the value of the mode register M is not 0 but 1 and the mode is the water depth gauge mode, step S6 is executed.
Going to 7, the diving type flag MF is set to 1,
It is determined whether or not any of the tissues requires decompression, and the value of the diving type flag MF is set to 0 instead of 1.
If the pressure does not need to be reduced for any of the tissues, the process proceeds to step S76. Then, in step S76, the dive time from the dive time counting circuit 7,
The water depth calculated in step S17 of FIG. 5 and the shortest non-decompression limit remaining time set in the shortest non-decompression limit remaining time register TA are digitally displayed using the display of the digital display unit 15a. For example, when the diving time is 20 minutes, the water depth is 19.7 m, and the shortest non-decompression limit remaining time is 3 minutes, the digital display is as shown in the digital display section 15a shown in FIG. Next, in step S77, the half-saturation time of the tissue whose tissue number has been set in the no-decompression diving attention tissue register X, that is, the tissue with the shortest non-decompression limit remaining time is displayed on the half-saturation time display section 16d. Thus, the above organization can be recognized. For example, the half-saturation time is 2
At 0 minutes, this display is as shown in the half-saturation time display section 16d shown in FIG. Next, step S78
Then, the shortest no-decompression limit remaining time set in the shortest no-decompression limit remaining time register TA is displayed on the graph display unit 15.
A graph is displayed using the bar graph display 16a of b. After the process in step S78, the process proceeds to step S71, in which the tissue number is set in the no-decompression dive caution tissue register X (that is, the no-decompression limit remaining time is the shortest, and the safety is the highest). The nitrogen partial pressure of the tissue requiring attention) is divided by the M value at 10 feet of the tissue (M (10) X) and further multiplied by 100 to calculate the percentage of nitrogen in the body (in this case, the decompression is reduced). It is 100% or less because diving is unnecessary.) In step S72, the calculated nitrogen content in the body is graphically displayed using the bar graph display 16c of the graph display unit 15b. Next, in step S73, the nitrogen partial pressure of the respiratory gas at the current environmental pressure is divided by the nitrogen partial pressure of the tissue for which the tissue number is set in the non-decompression diving attention tissue register X and further multiplied by 100. Calculate the environmental pressure (%) (If it is 100% or more, it indicates that nitrogen is absorbed at that depth, that is, the shortest non-decompression limit remaining time is getting shorter, and if it is less than 100%, it is from the body This indicates that nitrogen is being discharged, that is, the time is becoming longer). In step S74, the calculated relative environmental pressure is displayed as a graph using the bar graph display 16b of the graph display unit 15b (in the case of 100% or more, the display of the portion exceeding 100% is performed by blinking). For example, when the no-decompression limit remaining time is 3 minutes, the ratio of nitrogen in the body is 90%, and the relative environmental pressure is 120%, the display of the graph display unit 15b is performed as shown in FIG. It becomes a kimono. FIG. 10B is an enlarged view of the display of the graph display section 15b in this case, and the bar graph display 16b showing the relative environmental pressure is 100%.
The portion indicating% or more is indicated by a thick inclined line, which indicates the blinking display. For example, the non-decompression limit remaining time is 8 minutes, the nitrogen content in the body is 65%, and the relative environmental pressure is 85%.
%, That is, 100% or less, the above graph display is as shown in FIG. 10 (a), and there is no blinking display as in FIG. 10 (b) and the no-decompression limit remaining time is becoming longer. Easy to recognize.

If it is determined in step S67 of FIG. 8 that 1 is set in the diving type flag MF, that is, if it is determined that decompression is required for at least one or more tissues, step S68 is performed. To the diving time from the diving time counting circuit 7, the aforementioned step S in FIG.
The water depth calculated in step 17, the deepest decompression depth of the deepest decompression depth register SM, and the deepest decompression depth stop time of the deepest decompression depth stop time register TM are digitally displayed using the display unit of the digital display unit 15a (the deepest decompression). The depth is displayed after being converted to meters.) Then step S
At 69, the tissue whose tissue number has been set in the decompression dive caution tissue register Y, that is, the tissue with the deepest decompression depth (when two or more tissues have the same decompression depth, and when they are deepest, the stop time is long. The half-saturation time of the other tissue is displayed on the half-saturation time display section 16d. In step S70, the deepest decompression depth stop time of the deepest decompression depth stop time register TM is displayed using the bar graph display body 16a of the graph display unit 15b, and the display of the non-decompression limit remaining time described above (step S78). It is displayed blinking to distinguish it and to indicate that decompression is required. In the next step S71, the nitrogen partial pressure of the tissue whose tissue number is set in the depressurized dive caution tissue register Y, that is, the tissue that requires the most attention from the viewpoint of safety, is set to the M value (M (10) Y) at 10 feet of the tissue. ) And further multiply by 100 to calculate the nitrogen percentage (%) in the body (in this case, it is 100% or more when decompression is required). In the next step S72, the nitrogen content in the body determined by the above calculation is displayed using the bar graph display 16c, and the display of the portion exceeding 100% is performed by blinking. Thereafter, in step S73, the nitrogen partial pressure of the respiratory gas at the current environmental pressure is divided by the nitrogen partial pressure of the above-mentioned tissue whose tissue number is set in the depressurized dive caution tissue register Y to obtain a further 100.
The above-mentioned relative environmental pressure is calculated. And step S
At 74, similarly to the above, the calculated relative environmental pressure is graphically displayed by using the bar graph display 16b of the graph display unit 15b. For example, when the deepest decompression depth stop time is 7 minutes, the nitrogen content in the body is 115%, and the relative environmental pressure is 120% or more, the graph display unit 15 is executed by the above graph display processing.
The graph display of b is as shown in FIG. 10C (also in this figure, the portions of the bar graph display bodies 16a to 16c indicated by the thick inclined lines are blinking display as in the above description).

[0028]

The present invention relates to an electronic depth gauge provided with display means for displaying whether the tissue having the minimum non-decompression limit remaining time is in the state of absorption or discharge of inert gas. It is possible to provide an electronic depth gauge which can immediately recognize whether the current water depth increases or shortens the non-decompression limit remaining time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a circuit configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a RAM in FIG. 1;

FIG. 3 is a view showing a decompression table stored in a ROM in FIG. 1;

FIG. 4 is a general flowchart showing an outline of the operation of the embodiment.

FIG. 5 is a flowchart showing the measurement processing in FIG. 4 in detail;

FIG. 6 is a flowchart showing details of a process when pressure reduction is unnecessary in FIG. 5;

FIG. 7 is a flowchart showing in detail a process when pressure reduction is required in FIG. 5;

FIG. 8 is a flowchart showing the display processing in FIG. 4 in detail;

FIG. 9 is a diagram showing a display example of a display unit during a non-decompression diving.

FIG. 10 is a diagram showing a display example on a graph display unit.

[Explanation of symbols]

 7 Diving time counting circuit 15a Digital display unit 15b Graph display unit 16a to 16c Bar graph display unit 16d Half saturation time display unit M Mode register SF Diving flag i Tissue designation register TA Shortest no-decompression limit remaining time register MF Diving type flag Q1 Q6 Nitrogen partial pressure register MT No decompression limit remaining time register X No decompression dive attention tissue register GS Decompression depth register GT Decompression stop time register SM Deepest decompression depth register TM Deepest decompression depth stop time register Y Decompression diving attention tissue register

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B63C 11/02 B63C 11/32 A61B 10/00

Claims (2)

(57) [Claims] A pressure detecting means for detecting a pressure; a partial pressure calculating means for calculating a current partial pressure of an inert gas in a plurality of tissues of a human body based on the pressure detected by the pressure detecting means; An allowable limit amount storage means for storing an allowable limit amount of an inert gas partial pressure in the tissue that can float without decompression of the plurality of tissues; and an allowable limit amount of the inert gas partial pressure in each of the tissues and an allowance of the plurality of tissues. Non-decompression limit remaining time calculating means for calculating the non-decompression limit remaining time of a plurality of tissues from the limit amount, and the shortest non-decompression limit remaining time of the plurality of tissues calculated by the no-decompression limit remaining time calculation means Display means for displaying the non-decompression limit remaining time in a graph and displaying whether the tissue having the shortest non-decompression limit remaining time is absorbing or discharging inert gas. . 2. The electronic depth gauge according to claim 1, further comprising a tissue display unit for specifying a tissue on which the no-decompression limit remaining time is displayed on the display unit.