JPH0547368Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is designed to display water depth using a pointer driven by a so-called reversible motor that can be driven in both forward and reverse directions. The present invention relates to a water depth display device configured as follows.

[Prior art and its problems]

A digital water depth display device configured to convert a water pressure detection value by a water pressure detection sensor into a digital water depth value and display the water depth value using an electro-optical display device is disclosed, for example, in Japanese Patent Laid-Open No. 56-19480. This has already been proposed in the past, as disclosed in publications and Japanese Patent Laid-Open No. 193466/1983.

However, in the above-mentioned digital depth display device, when a liquid crystal display device with low power consumption is used as an electro-optical display device, there is a drawback that the display is dark and difficult to see underwater where outside light cannot reach easily. Furthermore, when a self-luminous display element such as an LED is used, a disadvantage arises in that power consumption becomes extremely large.

On the other hand, electro-optical display devices for digital display such as steam liquid crystal display devices and LED devices generally have a monotonous display format.For example, when adding a water depth display device to a diver's watch, etc. The reality is that in order to maintain a sense of luxury and uniformity, it is desired that water depth be indicated using a guideline. However, when attempting to display the water depth using a pointer, the problem is how to make the indicated position of the display member follow the position corresponding to the water depth data. In other words, when using a drive method such as the pointer in a well-known voltmeter, it is necessary to keep current flowing through the pointer control coil in order to maintain the water depth display state, and the power consumption for display is reduced. This makes it difficult to use it in portable water depth display devices that use small batteries as an energy source. Furthermore, even if an attempt is made to control the pointer for water depth display using an intermittent drive type electromechanical converter such as a step motor, in the past, it has not been possible to use an appropriate The reality is that there were no means of control. In addition, when the power supply battery reaches the end of its lifespan and needs to be replaced, or when the characteristics of the water pressure detection sensor change over time, the initial display position of the display member may change.
In other words, there may be a shift in the position corresponding to the zero point, but there is no established method to correct the shift in such a case, that is, to adjust the zero point, and in the end, the system was configured to measure water depth using electronic technology. In water depth display devices, it has not yet been possible to display water depth using a pointer.

[Purpose of invention]

An object of the present invention is to realize a water depth display device configured to control a water depth display pointer via a step motor.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show a diver's wristwatch equipped with a pointer type water depth display device according to an embodiment of the present invention.

First of all, Figure 2 is a plan view showing its appearance.
The watch of this embodiment has a rear cover 1 and a push-pull button 2 as external operating members.
The display members include a time display pointer 3 consisting of a clock, a minute hand, and a second hand, and a water depth display pointer 4. However, the illustration of a sensor for detecting water depth, a mounting part for the sensor, etc. is omitted.

The reuse 1 is configured to be rotatable in the right direction R and the left direction L, and can be set to a one-step pull position 1b and a two-step pull position 1c in addition to the normal position 1a. Push position 2a
and the pull-out position 2b. In the watch of this embodiment, when the reuse 1 is set to the two-step pull position 1c and rotated in the right direction R or left direction L, the time display pointer 3 advances in the same direction as in the case of a conventional watch. Alternatively, correction in the direction of delay is possible. Regarding the button 2, when set to the pushed-in position 2a, the water depth display device is controlled to be in an ON state, and when set to the pulled out position 2b, the water depth display device is controlled to be set to an OFF state. Note that the button 2 is in the pressed position 2a.
When the watch is set to

Next, FIG. 3 is a block diagram showing the configuration of the water depth display device.

The water depth display device of this embodiment has a configuration in the form of a so-called microcomputer, where 5 is a clock signal forming circuit, 6 is a CPU, 7 is a ROM that stores programs, etc., 8 is a RAN, and 9 is an input. Port 10 is an output port.

The CPU 6, ROM 7, RAM 8, input port (hereinafter referred to as I port) 9, and output port (hereinafter referred to as O port) 10 are connected to each other by a bus line 11 consisting of a data bus, an address bus, and a control bus as necessary. connected.

Of the switches connected to I port 9, _S1 is a switch configured to be ON only when Reuse 1 is set to 1st pull position 1b, and switch _S2 is This switch is configured to be turned on when the push-pull button 2 is set to the push-in position 2a. Further, the switches S _R and S _L are switches configured to be intermittently turned on when the reuse 1 is rotated in the right direction R and the left direction L, respectively.

Further, the input section I of the I port 9 is configured to receive water pressure detection sampling data from the water pressure detection device 12 at every predetermined sampling period. The water pressure detection device 12 includes a water pressure detection section 13 including a water pressure detection sensor, an amplifier 14 for amplifying an output signal from the water pressure detection section 13, and an analog output signal from the amplifier 14 into a digital signal. It is composed of an A/D conversion circuit 15 for conversion. Note that the water pressure detection section 13
is configured to perform a water pressure detection sampling operation in response to a sampling signal of a predetermined period from the clock signal forming circuit 5.
Clock signal forming circuit 5 for water pressure detection section 13
The supply lines for clock signals and sampling signals from the circuit are omitted from illustration for the purpose of simplifying the drawing.

On the other hand, output terminals O ₁ and O ₂ of O port 10 are
They are connected to a forward rotation drive signal forming circuit 18 and a reverse rotation drive signal forming circuit 19 via one shot circuits 16 and 17, respectively. Further, the output signals from the forward rotation drive signal forming circuit 18 and the reverse rotation drive signal forming circuit 19 are input to the motor drive circuit 20 to drive the step motor 21 in the forward rotation direction or the reverse rotation direction. , is configured to drive the water depth display pointer 4 described above in the forward rotation direction or reverse rotation direction via the wheel train 22.

The motor 21 is a so-called reversible step motor, and the structure of such a reversible step motor and its forward rotation drive signal, reverse rotation drive signal, etc., is disclosed in, for example, Japanese Patent Application Laid-Open No. 1983-1999.
It is possible to use the same type of reversible step motor for watches as disclosed in No. 80063 and the like.

Further, in FIG. 3, the supply lines for each clock signal sent from the clock signal forming circuit 5 to the one-shot circuits 16, 17, the forward rotation drive signal formation circuit 18, the reverse rotation drive signal formation circuit 19, etc. are also shown. The illustration is omitted for the sake of simplicity.

Next, FIG. 1 is a flowchart of a program written in the ROM 7 for controlling the operation of the water depth display device.

The operation of the water depth display device of this embodiment will be explained below with reference to the drawings. However, in FIGS. 1 and 3, parts related to control such as driving of the time display pointer 3 are omitted because they are not directly related to the gist of the present invention.

First, in the watch of this embodiment, when button 2 is pressed to position 2a, switch S ₂ is turned ON.
Since the water depth display device is in this state, the water depth display device is turned on, and the operation program of the water depth display device shown in FIG. 1 starts. However, button 2 is
If a push or pull operation is applied underwater, there is a risk that moisture will enter the inside of the watch, so the depth display device will start operating on land.

Therefore, in the watch of this embodiment, when the water depth display device starts operating, it is still on land and no water pressure is applied to the water pressure detection sensor of the water pressure detection section 13. In this state, if the water depth display pointer 4 does not indicate zero, it is necessary to adjust the initial position of the water depth display pointer 4, that is, zero point adjustment, before actually diving into the water. Therefore, first, we will explain the operation of this zero point adjustment.

If it is necessary to carry out the above-mentioned zero point adjustment, the lid 1 is set to the first pull position 1b while the button 2 remains set to the push-in position 2a. As a result, switch _S1 is turned on, so the first
In the program shown in the figure, the program advances from step A-1 to step A-2, where a switch is input by rotating the crown 1. That is, the switch _S1 serves as a mode setting external operation switch that sets an adjustment mode for adjusting the initial position of the water depth display pointer 4 in accordance with the set position of the reuse 1 in the axial direction.

Here, if the switch input due to the rotational operation of the reuse 1 is due to rotation in the right direction, that is, if it is an input from the switch S _R (step A-3), the output of the O port 10 is One pulse signal is output from terminal _O1 (step A
-4) and then supplied to the forward rotation drive signal forming circuit 18. As a result, the forward rotation drive signal forming circuit 1
Reference numeral 8 supplies a normal rotation adjustment drive signal for driving the step motor 21 by one step in the normal rotation direction to a motor drive circuit. That is, in this case, the motor 21 is driven in the forward direction by one step, and the water depth display pointer 4 is also rotated in the forward direction by one step.

Contrary to the above, if the switch input due to the rotational operation of Reuse 1 is due to rotation to the left, that is, if the input is from switch S _L , the output terminal O ₂ of O port 10 1 more
pulse signals are output (step A-5),
The signal is supplied to the reverse drive signal forming circuit 19. In response, the reverse drive signal forming circuit 19 forms a reverse adjustment drive signal for driving the step motor 21 in the reverse direction by one step and supplies it to the motor drive circuit. ,
The motor 21 is driven in the reverse direction by one step, and the water depth display pointer 4 is also rotated in the reverse direction by one step.

In any of the above cases, after the processing at step A-4 or step A-5, the process returns to step A-2, where the process waits for a switch input by rotating the crown 1. Also, step A-2
If there is no switch input for a predetermined time width (for example, 0.5 seconds) or more during the stage of waiting for a switch input due to the rotation of Reuse 1, check whether switch _S1 is still in the ON state in Step A-6. The process advances to the confirmation stage, and if it is in the ON state, the process returns to the stage of waiting for input of the reuse rotary switch in step A-2. Also Switch S ₁
is already in the OFF state, in step A-7, the contents (Do) of the old data storage section in RAM 8, which will be described later, are reset to zero, and then the process returns to the initial start stage. I will do it.

Therefore, when adjusting the zero point of the water depth display pointer 4, set the watch 1 to the 1st pull position 1b, and then rotate the watch 1 to the right or left as necessary. Accordingly, the water depth display pointer 4 may be driven in the forward direction or in the reverse direction to move it to the position indicating zero. That is, the switches S _R and S _L , which are operated in response to the rotational operation of the reuse 1, serve as adjustment execution external operation switches that are provided with an adjustment execution control function only in the above-mentioned adjustment mode setting state.

Next, when you set the button 2 to the push-in position 2a on land and turn on the water depth display device, if the water depth display pointer 4 indicates the zero point and there is no need to adjust the zero point, or if the water depth display pointer 4 indicates the zero point, or Guideline 4
The following describes the actual operation of the water depth display device after the zero point adjustment has already been completed.

In this case, the reuse 1 is in the normal position 1a.
Since the switch _S1 is in the OFF state, the process proceeds from step A-1 to the step of waiting for water pressure data to be input to the input section I of the I port 9 (step B-1).

Here, when water pressure data is given from the water pressure detection device 12 that performs a water pressure detection operation at a predetermined sampling period, the water pressure data is converted to pointer display data (for the water depth display pointer 4 to display the water depth). The process proceeds to the step of converting the display data (display data indicating the position to be indicated) into _Do (step B-2).

In this embodiment, when the motor 21 is driven one step, the water depth display pointer 4 moves by an amount equivalent to 1 m on the water depth display dial, so the CPU 6 ends up measuring the water pressure. When converting the data into pointer display data D _o , a water depth value rounded to the nearest meter is calculated.

Furthermore, the latest pointer display data (hereinafter simply referred to as new data) _Do is stored in the new data storage section of RAM8 (Step B-3), and this new data _Do is transferred to the old data storage section of RAM8. Difference _P (i.e. water depth display pointer 4
(equivalent to the number of moving steps of the motor 21 or the number of driving steps of the motor 21) (Step B-
4), and the process proceeds to the step of comparing the magnitude relationship between the new data D _o and the old data D _p (step B-5).

Here, when D _o - D _p = 0, that is, when P = 0 and the new data D _o is equal to the old data D _p , there is no change in the water depth display value, and therefore it is necessary to move the water depth display pointer 4. Since there is no such thing, you will immediately return to the starting stage.

In addition, when D _o −D _p > 0, that is, when P is positive and the new data D _o is larger than the old data D _p ,
Since the displayed value of the water depth has changed in the direction larger than that during the previous water pressure detection sampling operation, the process moves to the step of outputting one pulse signal from the output terminal _O1 of the O port 10 (step B-6). move on. As a result, the step motor 21 is driven by one step in the forward direction, and the water depth display pointer 4 is also rotated by one step in the forward direction. After this, there is a further step of counting down the value of P stored in the RAM 8 by 1 (step B).
-7), the process proceeds to the step (step B-8) of checking whether this P has become zero. Here, if the value of P has not yet become zero, the process returns to the step of outputting one pulse signal from the output terminal O1 of the O port ₁₀ (step B-6),
The same process as above will be repeated. In addition, if the above P has become zero, the water depth display pointer 4
has already been rotated in the normal direction to the indicated position indicating the new data D _o , the driving of the step motor 21 is terminated, and the contents of the old data (D _p ) storage section of the RAM 8 are transferred to the new data mentioned above. (D _p ) After proceeding to the step of re-memorizing the latest pointer display data _Do in the current water pressure detection sampling operation in the storage section (step B-12), the process returns to the start step again.

On the other hand, at the stage of comparing the new data D _o and the old data D _p mentioned above (step B-5),
When D _o −D _p < 0, that is, P is negative and new data
If D _o is smaller than the old data D _p , the water depth display value has changed to a smaller value than the previous water pressure detection sampling operation, so O port 1
The process then proceeds to a step (step B-9) in which one pulse signal is output from the zero output terminal _O2 . As a result,
The step motor 21 is driven by one step in the reverse direction, and accordingly, the water depth display pointer 4 is also rotationally moved by one step in the reverse direction. After this, the P
After the step of counting up the value of P by 1 (step B-10), the process advances to the step of checking whether the value of P has become zero (step B-11). Here, if the value of P has not yet become zero, the process returns to the step of outputting one pulse signal from the output terminal _O2 of the O port 10 (step B-9), and the same process as above is performed. will be repeated.
Furthermore, if P is zero, this indicates that the water depth display pointer 4 has already been reversely moved to the indicated position indicating the new data D _o , so the drive of the step motor 21 is terminated and the RAM 8 After the step (step B-12) of rewriting the contents of the old data (D _p ) storage section with the above-mentioned new data D _o , the process returns to the starting stage.

In any case, after returning to the start stage, the next water pressure detection sampling operation will be performed and the water pressure will be A stage of waiting for water pressure detection data to be input from the detection device 12 to the input part I of the I port 9 (step B)
-1) and repeats the same process as described above. In other words, while the water depth display operation is maintained, the steps from step B-1 to step B described above are performed.
-12 continues to be performed every sampling period.

Note that the water pressure detection device 12 is configured to output water pressure detection data at every predetermined sampling period, but when the sampling period is set relatively large, the above-mentioned push-pull
If the configuration is such that the first sampling operation is performed immediately after the button 2 is set to the pressed position 2a, it becomes possible to immediately check whether or not the above-mentioned zero point adjustment needs to be performed.

[Effect of idea]

As described above, according to the present invention, while using a step motor which is an intermittent drive type electromechanical converter, the pointer for water depth display can easily indicate the water depth data to be displayed for each water depth detection sampling operation. In order to be able to follow the position,
It is possible to reduce power consumption for driving the pointer. Furthermore, the direction of rotation of the pointer is determined for each water depth detection sampling operation according to the direction of change in water depth data since the previous sampling operation, so the movement of the pointer itself is extremely smooth. Become. Furthermore, in the present invention, even if the initial display position of the display member deviates for some reason, the positional deviation can be corrected very easily without requiring disassembly of the device. Furthermore, in the present invention, the adjustment execution external operation switch is normally given the adjustment execution control function only when the initial position adjustment mode is set by operating the mode setting external operation switch. Even if the adjustment execution external operation switch is accidentally operated incorrectly during use, accidents such as the display position being shifted can be prevented.

In the above-mentioned embodiment, the pointer for water depth display is configured to rotate completely once, but the pointer may also be configured to rotate only within a predetermined angular range (for example, within a range of 180 degrees). It is possible.

[Brief explanation of the drawing]

1 to 3 are diagrams showing a diver's wristwatch equipped with a water pressure display device according to an embodiment of the present invention, and FIG. 1 is a flowchart of a program for controlling the operation of the water depth display device, and FIG. The figure is a plan view showing the external appearance, and FIG. 3 is a block diagram showing the configuration of the water depth display device. 1... Reuse, 1a... Normal position, 1b...
1st pull position, 2...push pull button,
2a... Push-in position, 2b... Pull-out position,
4...Water depth display pointer, 5...Clock signal forming circuit, 6...CPU, 7...ROM, 8...RAM,
9... Input port, 10... Output port, 11... Bus line, 12... Water pressure detection device, 18... Forward rotation drive signal forming circuit, 19...
... Reverse drive signal forming circuit, 20 ... Motor drive circuit, 21 ... Step motor, 22 ... Wheel train.

Claims (1)

[Scope of utility model registration request] A pointer that displays the water depth, a reversible step motor for driving the pointer, a water pressure detection means that outputs water pressure detection sampling data at a predetermined sampling period, and a display of the sampling data from the water pressure detection means. a determining means for determining the direction in which the motor should be driven by comparing the previous display data and the current display data; a calculation means for calculating the drive amount of the motor based on the difference with the current display data; a motor drive control means for forming a motor drive signal for driving the motor in the direction; and a zero point adjustment means for adjusting the zero point position of the pointer; an external operation switch for mode setting, an external operation switch for execution of adjustment that is given an adjustment execution control function only when the zero point adjustment mode is set, and an external operation switch for execution of adjustment. and an adjustment drive signal forming means for forming an adjustment drive signal in response to an input from the motor, and the zero point position of the pointer is adjusted by supplying the adjustment drive signal to the motor. Features a water depth display device.