JP3381276B2 - Electronic depth gauge - Google Patents

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention provides information for avoiding decompression sickness caused by the ascending mode after diving performed by inhaling so-called compressed air composed of oxygen and inert gas (including nitrogen gas). Electronic depth gauge for easy display.

[0002]

2. Description of the Related Art Conventionally, a decompression table created by the US Navy has been used to determine the decompression depth from the maximum water depth and the dive time (in order to avoid a sudden decrease in water pressure during ascent, the ascent is temporarily stopped. , Depth when maintaining a certain depth) and decompression stop time (time when levitation is stopped and stays at the above decompression depth)
An electronic water depth gauge that digitally displays these values has been put into practical use. Furthermore, from the maximum water depth and dive time,
Also proposed an electronic depth gauge with a function to display the remaining time that can be ascended without depressurizing (staying at a predetermined depth to avoid a sudden decrease in water pressure), that is, the non-decompression limit remaining time. Has been done.

Generally, when a diver wants to ascend without decompressing when diving, he or she recognizes the no-decompression limit remaining time by using the electronic depth gauge as described above, and the no-decompression limit remaining time. Ascend before reaching 0, but on the other hand, when the remaining time for no decompression limit becomes 0, the ascent will be ascended at the specified decompression depth based on the data indicated by the electronic depth gauge as described above. Is stopped for a decompression stop time at the decompression depth, and decompression is performed.

By the way, in the electronic depth gauge as described above,
The maximum diving limit is required because the decompression data is sought because it is expected to be at maximum safety and is stagnation 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 in each tissue part in the human body in real time and obtains and displays data for proper decompression based on it is also announced. There is. That is, this multi-level electronic water depth meter has a 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 part in the human body. The human body tissue part is classified into a plurality of parts according to the time until it becomes), and the nitrogen amount of each is calculated in real time using the data such as the half-saturation time, and the appropriate decompression is made from this nitrogen amount and the safety limit nitrogen amount. However, some devices of this type display the shortest non-decompression limit remaining time of the non-decompression limit remaining time of each tissue.

[0005]

In the electronic depth gauge as described above, that is, in the multi-level type electronic depth gauge that displays only the shortest non-decompression limit remaining time, the non-decompression limit remaining for a tissue having a short half-saturation time is used. If only the time is reduced and the no-decompression limit remaining time for the tissue with a long half-saturation time is still significantly large, it is possible to lengthen the no-decompression limit remaining time for the tissue with a short half-saturation time by slightly ascending. , It does not require so much caution, but it should be noted that it is extremely dangerous when the non-decompression limit remaining time for all tissues is reduced.
That is, in the conventional multi-level electronic water depth gauge as described above, even if it is not necessary to pay much attention to it, or if it requires extreme caution, only the shortest no-decompression limit remaining time is displayed and these two cases are taken. It did not make it possible to recognize in which case. The present invention has been made in view of the circumstances as described above, and whether only the non-decompression limit remaining time of a specific tissue among a plurality of tissues is shortened, or the non-decompression limit remaining time of other tissues is also reduced. It is an object of the present invention to provide a multi-level electronic water depth gauge that makes it easy to recognize whether the water depth is becoming shorter.

[0006]

In order to achieve the above object, the present invention provides not only the non-decompression limit remaining time of a tissue related to the shortest half-saturation time but also the no-decompression of a plurality of tissues classified by the half-saturation time. The limit remaining time is displayed as a graph at the same time.

[0007]

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 the circuit configuration of this embodiment. That is, in this embodiment,
The CPU 1 is mainly connected to other circuit parts. The CPU 1 is a circuit unit that processes and processes the sent data, sends the processed data, sends a signal to each circuit unit, and controls them.

The oscillating circuit 2 is a circuit which constantly sends a signal of a constant frequency. The frequency dividing circuit 3 is a circuit unit that divides the signal from the oscillation circuit 2 to a predetermined frequency and sends it to the clock counting 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 the current time to the CPU 1, and outputs a 3 second signal, which is a measurement timing signal such as water pressure, every 3 seconds. This is a circuit for sending to the CPU 1.

The RS flip-flop 5 is a circuit which receives a set signal or a reset signal from the CPU 1 to enter a set state or a reset state, and outputs an output Q in the set state. The AND gate 6 is opened by the output Q from the RS flip-flop 5 to generate the frequency dividing circuit 3
Is a circuit for giving a signal of a predetermined frequency from the dive time counting circuit 7. The dive time counting circuit 7 counts the signal of the predetermined frequency sent through the AND gate 6 to measure the elapsed time, and the measured elapsed time is used as the dive time C
It is a circuit unit that clears the measured elapsed time when it receives the clear signal from the CPU 1 while sending it to the PU 1.

The RAM 8 has the structure described below and has a CP
Under control of U1, it is a circuit unit that stores data from the CPU1 and sends the stored data to the CPU1. FIG. 2 shows the configuration of the RAM 8. The mode register R is a register for designating a mode,
When 0 is set, it specifies the clock mode when this electronic water depth gauge is used as a clock, and when 1 is set, the water depth when this electronic water depth gauge is used as a water depth gauge. Specify the measurement mode. Dive flag S
F is a flag that is set to 1 when the water depth is 1.5 m or more, that is, when substantial diving is being performed. The organization designation register i is a register for designating any of the tissues of the human body to which the organization numbers 1 to 6 are given. For example, when the organization number 2 is set, the organization number 2 is designated. The tissues of the human body are classified by the half-saturation time as described later. The shortest no-decompression limit remaining time register TA is a register to which the shortest one of the above-mentioned six tissues is set. The decompression depth register GS is a register in which the decompression depth of the tissue designated by the tissue designation register i is set. Caution: The tissue register X is used for decompression diving (diving that requires decompression when ascending).
The tissue number of the tissue that is most important for avoiding decompression sickness, that is, the tissue having the deepest decompression depth (the tissue having the longest decompression stop time when there are two or more tissues having the deepest decompression depth) is the tissue number. This is the register that is set. The deepest decompression depth register SM is a register in which the deepest decompression depth, that is, the decompression depth of the tissue designated by the tissue number of the attention tissue register X is set. The deepest decompression depth stop time register TM is a register in which the longest decompression stop time at the deepest decompression depth, that is, the decompression stop time of the tissue designated by the tissue number of the attention tissue register X is set.

The data storage section DM consists of four rows to which row addresses 1 to 4 are given. The row of row address 1 is provided with nitrogen partial pressure memories Q1 to Q6 for storing the nitrogen partial pressures of the tissues of tissue numbers 1 to 6, respectively, and the row of row address 2 contains the current diving. Diving species flags MF1 to MF6 are provided for each of the above-mentioned organizations to store whether they are non-decompression dives (dives that do not require decompression when ascending) or decompression dives (in the case of non-decompression dives, respectively). Is 0, and 1 is stored for decompression diving). In addition, the row of row address 3 is provided with non-decompression-limit remaining time memories MT1 to MT6 for storing the non-decompression-limit remaining time when the non-decompression diving is performed on each tissue. In the row of row address 4, the decompression time memories GT1 to GT1 respectively store the decompression time when decompression diving is performed on each tissue.
GT6 is provided.

The ROM 9 is a circuit for fixedly storing programs for various processes as an electronic water depth gauge, a safety allowable limit amount of nitrogen at the time of ascent, and sending these to the CPU 1 under the control of the CPU 1. It is a department. As the safety allowable limit amount of nitrogen stored in the ROM 9, for example, a decompression table of the US Navy is stored, and this decompression table is classified according to the half-saturation time as shown in a part of it in FIG. The M value is stored for each tissue of the human body (
In the figure, for example, the organization of organization number 2 is indicated as M-2). Here, the M value is an allowable nitrogen partial pressure indicating that it is safe within the specified ascent rate, regardless of how much nitrogen is dissolved in each tissue of the human body, and the value for every 10 feet of water depth is stored. (In the figure, for example, a water depth of 10
The M value in feet is displayed as M (10)). That is,
When the nitrogen partial pressure of a certain tissue exceeds the M value of a predetermined water depth of the tissue due to diving, the nitrogen partial pressure is M at that depth.
It will have to stay below the value.

Pressure sensor 10, amplifier circuit 11 and A /
The D conversion circuit 12 is a circuit unit that is activated by receiving an activation signal from the CPU 1, and the pressure sensor 10 supplies to the amplification circuit 11 an analog electric signal of a level corresponding to environmental pressure (pressure obtained by adding water pressure to atmospheric pressure). The amplifier circuit 11 sends the amplified analog electric signal to the A / D conversion circuit 12 and amplifies the analog electric signal.
The / D conversion circuit 12 converts the amplified analog electric signal into a digital electric signal and gives it to the CPU 1. The switch unit 13 includes various switches, and when any of these switches is operated, the corresponding switch input is CP
It is a circuit unit for sending to U1.

The display drive circuit 14 is a circuit unit that drives the display unit 15 and displays various data sent from the CPU 1 on the display unit 15. As shown in FIG. 9 for explaining the display process, the display unit 15 includes a digital display unit 15a that digitally displays the water depth and the like, and a graph display unit 15b that graphically displays the non-decompression limit remaining time and the like. The bar graph display section 15b is provided with six bar graph display bodies, and below them, M-1, M-2, ...
And a number of time scales 5, 10, 20, ..., 100 in units of minutes are printed and displayed along the vertical axis of the bar graph on the left side of the graph display portion 15b. .

The operation of the present embodiment constructed as described above will be described below. FIG. 4 is a general flowchart showing the outline of the operation of this 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 a switch input has not been sent, the process directly proceeds to step S8, but is sent. If so, the process proceeds to step S2, and it is determined whether the mode switch SM was operated. And it is the mode switch S that has been operated.
When it is determined that the value is not M, the process proceeds to step S7, the switch process according to the switch input sent is executed, and then the process proceeds to step S8. On the other hand, in step S2, the operated switch is the mode switch SM.
When it is determined that the value of the mode register R is 0 and the watch mode is set, the process proceeds to step S4, and the value of the mode register R is set to 1 when the watch mode is set. Then, the water depth meter mode is set, and then the process proceeds to step S8. When it is determined in step S3 that the value of the mode register R is 1 instead of 0 and the water depth meter mode is set, the process proceeds to step S5, and the diving flag SF is 0, that is, the dive is performed. If it is not diving, if it is not diving, the mode register M is set to 0 in step S6 to set the clock mode, and the process proceeds to step S8. However, in step S5, the value of the diving flag SF is When it is determined that the diving is performed in step 1, the process directly proceeds from step S5 to step S5.
Go to 8.

In step S8, it is checked whether the value of the mode register R is 1 and the water depth meter mode is set. If it is in the water depth meter mode, the flow advances to step S9 to execute the measurement process described later. When the measurement process of step S9 is completed or when it is determined that the value of the mode register R is 0 instead of 1 in the clock mode in step S8, the process proceeds to step S10 and various data is displayed on the display unit 15. Display processing is performed, and then the process returns to step S1.

FIG. 5 is a flow chart showing in detail the measurement process of step S9 of FIG. That is, in the measurement process, first in step S15, the total clock number circuits 4 to 3
It is determined whether or not the 3 second signal sent every second is sent. If not, the measurement process is ended, but if the 3 second signal is sent, step S16 is performed. Proceed to. In this step S16, the pressure sensor 1
0, an amplifier circuit 11, and an A / D conversion circuit 12 are sent a start signal to detect the pressure, and 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 the calculation method that has been conventionally performed with 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 diving is being performed, the process proceeds to step S19, and it is determined whether the value of the diving flag SF is 0. If it is 0, the diving is performed in step S20. The value of the medium flag SF is set to 1 and the start of diving is stored. Next, in step S21, RS
A set signal is sent to the flip-flop 5, the AND gate 6 is opened by setting it, and a signal of a predetermined frequency from the frequency dividing circuit 3 is sent to the dive time counting circuit 7 so that the dive time counting circuit 7 Start measurement. When the processing of this step S21 is completed, or the above-mentioned step S21
When it is determined in 19 that the value of the diving flag SF is already 1 instead of 0, the process proceeds to step S22 and R
AM8 shortest no-decompression limit remaining time register TA, deepest decompression depth register SM, deepest decompression depth stop time register T
An initial setting process for clearing M and the diving type flags MF1 to MF6 and the like is executed, and in step S23, 1 is set in the tissue designation register i, and first, the organization of organization number 1 (that is, M-1 in the graph display unit 15). Organization displayed as
Is specified.

After designating the tissue of organization number 1 as described above, the process proceeds to step S24, and nitrogen of the organization designated by the organization designating register i (in this case, the organization of organization number 1 as described above). Calculate the partial pressure. in this case,
The calculation is performed by the following formula. Qi = Pi + (N-Pi) (1-0.5 ^{(T / Hi)} ) (1) where i is the value of the organization designation register i, and the organization designated by this organization designation register i It is shown that the data are various data, but in the present embodiment, i = 1, 2, ...
... takes values up to 6. That is, Qi is the current nitrogen partial pressure (bar) of the tissue of tissue number i, Pi is the nitrogen partial pressure (bar) of the tissue of tissue number i before T time (minutes), and N is the respiratory gas at the current environmental pressure. Nitrogen partial pressure (bar), Hi is the half saturation time (minute) of the tissue of tissue number i. Note that, as described above, the measurement is performed every 3 seconds after receiving the signal for 3 seconds (see step S15), so Pi becomes the nitrogen partial pressure of the tissue 3 seconds before. Further, the nitrogen partial pressure N in the current environmental pressure is obtained by multiplying the environmental pressure (atmospheric pressure + water pressure) by the ratio of nitrogen in the absorbing gas.

After the processing of step S24 is completed, the process proceeds to step S25, and the nitrogen partial pressure memory designated by the tissue designating register i, that is, the nitrogen partial pressure memory Q1 in this case, is stored in the tissue number 1 calculated in step S24. Set the nitrogen partial pressure of the tissue. Next, in step S26, the nitrogen partial pressure of the tissue having the tissue number 1 set in the nitrogen partial pressure memory Q1 is the tissue number 1 at a water depth of 10 feet.
Check whether the value is larger than the M value of the tissue of 3.06 bar (see Fig. 3). When it is determined that the nitrogen partial pressure of the tissue of the tissue number 1 set in the nitrogen partial pressure memory Q1 is not larger, the process proceeds to step 31 and the below-described depressurization unnecessary process is executed, and then the step is performed. Proceed to S29. On the other hand, when it is determined in step S26 that the nitrogen partial pressure of the tissue of organization number 1 is larger, the process proceeds to step S27, in which the diving species flag designated by the tissue designating register i, that is, the diving species in this case. The flag MF1 is set to 1 and it is stored that the pressure reduction is necessary for at least the tissue of organization number 1. Next, in step S28, a pressure reduction necessary process which will be described later is executed, and then the process proceeds to step S29. In step S29, it is determined whether the value of the organization designation register i is 6, but in this case, the value of the organization designation register i is 1 and not 6, so the process proceeds to step S30 and the organization designation register i The value of is increased by 1 by 2, and after that, step S24
Return to. Hereinafter, the processes of steps S24 to S30 are repeated, and the same processes as described above are performed on the tissues of the tissue numbers 2 to 6. Then, when the process for the organization with the organization number 6 is completed, the fact is detected from the fact that the value of the organization designation register i is 6 in step S29, the measurement processing is completed, and the display processing of FIG. Proceed to step S10). On the other hand, when it is determined in step S18 of FIG. 5 that the water depth is not equal to or more than 1.5 m, it is determined that the water surface has risen, and in step S33 the value of the dive flag SF is 1, that is, whether or not the dive was performed until then. When the value is 1, 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 RS flip-flop 5 is set in the reset state to set the dive time in the dive time counting circuit 7. Stop counting.

FIG. 6 is a flow chart showing the details of the pressure reduction unnecessary process (step S31) in the measurement process (FIG. 5). In this process, first, step S40.
Then, the non-decompression limit remaining time MTi for the tissue designated by the tissue designating register i, (the remaining time until the limit time point at which the tissue can be directly floated without requiring decompression as described above.
That is, from that point, the nitrogen partial pressure of the tissue is 10
Calculate the M value in feet, that is, the time until M (10) i is exceeded. In this case, the non-decompression limit remaining time MTi
Is calculated by the following formula. MTi = −Hi × log {(N−M (10) i) / (N−Qi)} / log2 (2) The expression (2) is substantially the same as the expression (1). In the above, Qi is M (10) i, T is MTi, Pi is Qi, and MTi is solved.

After the non-decompression limit remaining time MTi has been calculated in the processing of step S40, the process proceeds to step S41.
The calculated no-decompression-limit remaining time MTi is stored in the non-decompression-limit remaining time memory MT1 of the RAM 8 which is designated by the tissue designating register i, that is, the no-decompression-limit remaining time memory MTi. Next, in step S42, it is determined whether the value of the organization designation register i is 1, and when it is 1, the process proceeds to step S43 and the RAM 8
In step S41, the shortest no-decompression limit remaining time register TA is set with the no-decompression limit remaining time stored in the no-decompression limit remaining time memory MT1. On the other hand, step S4
When it is determined in 2 that the value of the organization designation register i is not 1, the process proceeds to step S44. And this step S4
In step 4, in step S40, the no-decompression limit remaining time memory M
The no-decompression limit remaining time stored in Ti is shorter than the no-decompression limit remaining time (that is, the no-decompression limit remaining time for other tissues) that has already been transferred to and stored in the shortest no-decompression limit remaining time register TA. Determine if If it is shorter, the process proceeds to step S43, and the shorter non-decompression limit remaining time, that is, the non-decompression limit remaining time stored in the non-decompression limit remaining time memory MTi, is the shortest non-decompression limit remaining time register. Update TA time. As described above, in the depressurization unnecessary process, the no-decompression limit remaining time is calculated for the tissues that do not require decompression, and the no-decompression limit remaining for the tissues having the shortest time (that is, the remaining amount is low) is calculated. The time is retrieved and set in the shortest no-decompression limit remaining time register TA.

FIG. 7 is a flow chart showing in detail the pressure reduction necessary process (step S28) in the measurement process (FIG. 5). That is, in the pressure reduction necessary process, first, in step S50, the pressure reduction depth is obtained, and in this case, the one designated by the tissue designation register i of the nitrogen partial pressure memories Q1 to Q6, that is, the nitrogen partial pressure memory Qi is stored. Compare the nitrogen partial pressure with the M value at a depth of 20 feet (that is, M (20) i), the M value at a depth of 30 feet (that is, M (30) i), ... The largest M value that does not exceed the nitrogen partial pressure stored in the pressure memory Qi (that is, M (10) i, M (20) i, M (30) i, M
(40) i, ...) is obtained, and the water depth related to the obtained M value is defined as the decompression depth. Next, in step S51, RA
The decompression depth obtained in step S50 is set in the decompression depth register GS of M8, and the decompression stop time GTi at the decompression depth is calculated in step S52. The following equation is used for this calculation. GTi = −Hi × log {(N−M (x) i) / (N−Qi)} / log2 (3) This equation (3) is essentially the same as the above equation (2). ,
M (x) i is the M value corresponding to the above-mentioned decompression depth.

After the processing of step S52 is completed, the process proceeds to step S53, and the depressurization time memories GT1 to GT are stored.
The one designated by the tissue designating register i in T6, that is, the decompression time memory GTi stores the decompression stop time calculated in step S52, and then the value of the tissue designating register i becomes 1 in step S54. Determine if. If it is 1, step S55
Then, the decompression depth set in the decompression depth register GS in step S51 is set to the deepest decompression depth register SM.
Set to. In the next step S56, the pressure reduction stop time stored in the pressure reduction time memory GTi, that is, the pressure reduction time memory GT1 in step S53 is set in the deepest pressure reduction depth stop time register TM. Further next step S
In 57, the value of the tissue designating register i, that is, 1 is set in the caution tissue register X, and it is stored that the decompression stop time set in the deepest decompression depth stop time register TM is for the tissue of organization number 1. To do.

On the other hand, when it is determined in step S54 that the value of the organization designation register i is not 1, step S6
0, and is the decompression depth calculated this time set in the decompression depth register GS larger (deeper) than the decompression depths of other tissues that have already been calculated and set in the deepest decompression depth register SM? To judge. When the decompression depth calculated in this time 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 this 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 memory GTi, and in the next step S57, the value of the tissue designation register i at that time is set. Caution Set in organization register X. In step S60, it is determined that the decompression depth calculated in this time set in the decompression depth register GS is not larger than the decompression depths of other tissues set in the deepest decompression depth register SM. In this case, the process proceeds to step S61, and it is determined whether the above both decompression depths are equal. If they are equal, the process proceeds to step S62, and the decompression stop time calculated this time stored in the decompression time memory GTi is longer than the decompression stop time already calculated and set in the deepest decompression depth stop time register TM. If it is long, the process proceeds to step S56, and 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 memory GTi in consideration of safety. Then step S5
At 7, the value of the tissue designation register i at that point is set in the caution tissue register X, 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 this decompression-necessary process, when a tissue that needs decompression is found, the decompression depth and decompression stop time required for each tissue are obtained, and the deepest decompression depth is set in the deepest decompression depth register SM. Then, the decompression stop time at the decompression depth (when the decompression depth is equal for two or more tissues and they are the deepest decompression depth, the longer decompression stop time of those decompression stop times) is used as the deepest decompression. 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 caution tissue register X.

FIG. 8 shows the display process (step S in FIG. 4).
It is a flow chart which shows 10) in detail. That is, in this display process, it is first determined in step S65 whether the value of the mode register R is 0 and the watch mode is set. If the watch mode is set, step S6 is executed.
6, the current time from the total clock circuit 4 is displayed on the liquid crystal display panel 15a of the display unit 15. On the other hand, when it is determined in step S65 that the value of the mode register R is 1 instead of 0, and it is determined that the depth gauge mode is set, step S6
In step 7, it is judged whether all the diving type flags MF1 to MF6 are set to 0, and it is judged that the pressure reduction is not required for any tissue, and the pressure reduction is performed for any tissue. If it is not needed, step S6
Go to 8. Then, in step S68, 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 register T
The shortest non-decompression limit remaining time set in A is digitally displayed using the display body of the digital display unit 15a. For example, the dive time is 20 minutes and the water depth is 19.7.
When m is the shortest non-decompression limit remaining time is 11 minutes, the digital display is as shown in FIG. Next, in step S69, as shown in FIG. 9, the no-decompression limit remaining time of each tissue stored in the no-decompression limit remaining time memory MT1 to MT6 is displayed by using each bar graph display body of the graph display unit 15b. And M-1, M-2, M- arranged below each bar graph display.
3, ... M-6 character display bodies (indicating the organizations of organization numbers 1, 2, 3 ... 6 respectively as described above) are lit and displayed. FIG. 10 is an enlarged view of the display on the graph display unit 15b. This display shows that the no-decompression limit remaining time for the tissues of tissue numbers 1 and 2 is 100 minutes or more, and the no-decompression limit remaining time of the tissues of tissue numbers 3, 4, 5, and 6 is 22 minutes and 10 minutes, respectively. It indicates that it is 12 minutes and 30 minutes.

If it is determined in step S67 of FIG. 8 that the dive type flags MF1 to MF6 are not all set to 0, the process proceeds to step S70 and the dive time from the dive time counting circuit 7 is reached. , The water depth calculated in step S17 of FIG. 5, the deepest decompression depth of the deepest decompression depth register SM, and the deepest decompression depth stop time register T
The deepest decompression depth stop time of M is digitally displayed by using the display body of the digital display unit 15a (the deepest decompression depth is displayed after being converted into meters). For example, when the diving time is 39 minutes, the water depth is 23.1 m, the deepest decompression depth is 12 m, and the stop time at the deepest decompression depth is 5 minutes, the digital display becomes as shown in FIG. Next, in step S71, the diving type flag MF1
It is determined whether all MF6 are set to 1, that is, all tissues need decompression. When all of the diving type flags MF1 to MF6 are not set to 1 and 0 is set to any of them, and it is determined that any tissue does not need decompression,
In step S75, 1 is set in the organization designation register i. In step S76, it is determined whether the value of the diving flag MFi designated by the tissue designating register i, that is, the value of the diving type flag MF1 for the tissue of organization number 1 in this case is 0, and it is 0 and decompression is performed. When it is not necessary, the process proceeds to step S77, the no-decompression limit remaining time of the no-decompression limit remaining time memory MT1 is lit and displayed by using the leftmost bar graph display body of the graph display unit 15b, and M-below it is displayed. The character display 1 is turned on. On the other hand, in step S76, the value of the diving type flag MF1 is not 0 but 1
When the above tissue requires decompression, the process proceeds to step S78, where the decompression time in the decompression time memory GT1 is blinked using the bar graph display on the leftmost side of the graph display unit 15b, and below that. The M-1 character display is turned on. After the processing in step S77 or S78 is completed, it is confirmed in step S79 that the value of the organization designating register i is not 6, that is, the graph display for all the organizations is not completed yet. In step S80, the value of the organization designation register i is set to 1
Then, the value is increased to 2, and the process returns to step S76. Thereafter, the same processing as described above is repeated to graphically display the non-decompression limit remaining time or decompression time for the tissues of organization numbers 2, 3, ... 6 and M-2, M-3 ,. The character display is turned on. Then, when the graph display as described above is finished for all the organizations, the fact is detected in step S79, and the process proceeds to step S73. Step S73
Then, the tissue in which the tissue number is set in the caution tissue register X, that is, decompression is required, and the decompression depth is the deepest (the decompression depths for two or more tissues are equal,
When they are the deepest, the character display bodies (M-1, M-2, etc.) that display the tissue having the longer stop time) are displayed in a blinking manner.

For example, the tissues of tissues Nos. 1, 2, 5, and 6 do not require decompression, and the non-decompression limit remaining time is 7
Minutes, 5 minutes, 7 minutes, 22 minutes, while the tissues of tissue numbers 3 and 4 require decompression and these decompression times are 5
When the time is 3 minutes, the display on the graph display unit 15b is as shown in FIG. 11, but FIG. 12 is an enlarged view of the display (organization numbers 3, 4 in both the above figures). The bar graph display for the tissue is shown as a slanted line, which is a blinking display). In addition,
Although not shown in the above figures, either the M-3 or M-4 character display body, that is, the character display body displaying the tissue having the deeper decompressed water depth, is displayed as a blinking display as described above. To be done.

If it is determined in step S71 of FIG. 8 that the diving species flags MF1 to MF6 are all set to 1, that is, if it is determined that decompression is required for all tissues, the step is executed. Progressing to S72, the decompression time for each tissue stored in the decompression time memories GT1 to GT6 is displayed blinking by using the corresponding bar graph display body of the graph display unit 15b, and M-1, M-2, ...
... The M-6 character display is lit up. Next, in step S73, similarly to the above, only the character display for displaying the tissue having the tissue number set in the attention tissue register X is switched to the blinking display.

[0030]

As described in detail above, the present invention relates to an electronic water depth gauge that simultaneously displays the non-decompression limit remaining time of a plurality of tissues classified by the half-saturation time. A multi-level electronic device that makes it easy to recognize whether the non-decompression limit remaining time of a specific tissue is short or the non-decompression limit remaining time of other tissues is uniformly short. It is possible to provide a water depth meter.

[Brief description of 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 shown in FIG.

3 is a diagram showing a decompression table stored in a ROM shown in FIG.

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

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

FIG. 6 is a flowchart showing in detail the processing when decompression is unnecessary in FIG.

FIG. 7 is a flowchart showing in detail the processing when decompression is necessary in FIG.

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

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

FIG. 10 is an enlarged view showing a display of a graph display unit in FIG.

FIG. 11 is a diagram showing a display example of a display unit during decompression diving.

FIG. 12 is an enlarged view showing a display of a graph display unit in FIG.

[Explanation of symbols]

7 Diving time counting circuit 15a Digital display 15b Graph display R mode register SF diving flag i Organization designation register TA Shortest no-decompression limit remaining time register X attention organization register DM data storage MT1 to MT6 No decompression limit remaining time memory GT1 to GT6 Decompression time memory Q1 to Q6 nitrogen partial pressure memory MF1 to MF6 Diving species flag GS decompression depth register SM deepest decompression depth register TM deepest decompression depth stop time register

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B63C 11/02 A61B 10/00

Claims (3)

(57) [Claims] And 1. A pressure detecting means for detecting an environmental pressure, and partial pressure calculation means for calculating a plurality of tissue each tissue inert gas partial pressure of the human body based on the detected ambient pressure at said pressure detecting means An allowable limit amount storage means for storing an allowable limit amount that can be floated without decompression of a partial pressure of an inert gas in the tissue preset for each of a plurality of tissue parts of a human body at the time of diving; No-decompression limit remaining time calculating means for calculating the no-decompression limit remaining time of each tissue from the inert gas partial pressure and the allowable limit amount of the plurality of tissues, and the plurality of non-decompression limit remaining time calculating means An electronic water depth gauge, which is provided with a graph display means for simultaneously displaying the non-decompression limit remaining time of the tissue of FIG. 2. A pressure reduction is required for each tissue based on the current inert gas partial pressure in each tissue calculated by the partial pressure calculation means and the allowable inert gas partial pressure of each tissue in the allowable limit amount storage means. Decompression detection means to detect whether or not, and calculate the decompression time of the tissue when decompression is detected by the decompression detection means, instead of the non-decompression limit remaining time on the graph display means 2. An electronic water depth gauge according to claim 1, further comprising display control means for displaying the decompression time in a graph different from the non-decompression limit remaining time. 3. The electronic depth gauge according to claim 1, wherein the environmental pressure is a pressure obtained by adding atmospheric pressure and water pressure.