JP2002175600A - Sea route end line display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sea route end line display system which irradiates a position as close to the sea surface as possible with laser light without coming into contact with the sea surface, scatters the laser light by effectively using fine splashes of sea water from the sea surface, and accurately and visually displays a sea route end line with the track of the laser light. SOLUTION: An irradiation position adjustment base 3 is composed of a mean sea surface height following body 11 which moves up and down following up the mean water level of the sea surface and a maximum wave height following body 13 which moves up and down the maximum height of waves, and a laser emission device 5 is installed on the irradiation position adjustment base 3 to hold the position of the laser light 8 as close to the sea surface as possible without coming into contact with the sea surface. The laser light 8 can be scattered by effectively using fine splashes of sea water from the sea surface, so the track of the laser light 8, i.e., the sea route end line can easily be viewed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel route end line display system that irradiates a laser beam along the sea surface and scatters it in the atmosphere to visually display the route end line.

[0002]

2. Description of the Related Art As a navigation support system for a ship using a laser beam, for example, a system using a laser distance measuring device and an arithmetic system as disclosed in Japanese Patent Application Laid-Open No. 3-54493 is generally used. At present, a route end line display system for directly displaying the route end line by directly utilizing the scattering of laser light is only in an experimental stage.

[0003]

The reason that it is difficult to commercialize a route end line display system that visually displays a route end line by directly utilizing the scattering of laser light is that scattering of laser light by atmospheric molecules themselves is insufficient. Therefore, it is difficult to visually recognize the trajectory of the laser beam.

[0004] The applicants have thought that in order to solve such a problem, laser light is scattered by using fine droplets of seawater rolled up from the sea surface.

[0005] Splashes of seawater are more nearer to the sea surface. Therefore, if the laser light is propagated to the sea surface, it is possible to clearly and visually display the route end line by the strong scattered light of the laser. Therefore, it is better to irradiate the laser light as close to the sea surface as possible, but if this irradiation position is set too close to the sea surface, there is a concern that the laser light will be cut off by the wave front and the function of the navigation system will be impaired. is there.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to irradiate a laser beam at a position as close to the sea surface as possible without contacting the sea surface, and to effectively utilize the fine droplets of seawater rolled up from the sea surface. It is an object of the present invention to provide a route end line display system which can scatter light and accurately and visually display the route end line by the trajectory of a laser beam.

[0007]

SUMMARY OF THE INVENTION The present invention is a route end line display system for irradiating a laser beam along the sea surface and scattering it in the atmosphere to visually display the line end line. In particular, an irradiation position adjustment table is provided which moves up and down at a position higher than the sea surface by a predetermined amount in accordance with the height of the sea surface. A configuration is provided in which a unit is installed.

According to such a configuration, the irradiation position adjusting table moves up and down at a position higher than the sea surface by a predetermined amount, following the height of the sea surface. Since the final output part of the laser emitting device that irradiates laser light is installed on the irradiation position adjustment table,
The laser beam which moves up and down together with the irradiation position adjusting table and is irradiated from the final output section is always irradiated at a predetermined distance (about 50 cm to 2 m) from the sea surface. As a result, the laser light is always scattered at a position slightly higher than the sea surface, making effective use of fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser light, that is, the route end line, is easily observed. Will be able to

Here, the irradiation position adjusting table can be constituted by an average sea level follower having buoyancy, which is movably provided in a vertically installed pipe body in communication with the sea.

According to such a configuration, the seawater inside the pipe moves up and down in response to a change in the level of the seawater, for example, the ebb and flow of the tide. Therefore, the buoyant average sea level follower disposed inside the tube also moves up and down according to the fluctuation of the sea level, and is irradiated from the final output section of the laser emitting device installed in the average sea level follower. The relationship between the laser beam and the height of the sea surface is always kept constant irrespective of the fluctuation of the sea level due to ebb and flow of the tide. As a result, the laser light is always scattered at a position slightly higher than the sea surface, making effective use of fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser light, that is, the route end line, is easily observed. Will be able to

Also, an average sea level follower having buoyancy disposed vertically movably inside a pipe installed vertically in communication with the sea, and provided vertically inside the average sea level follower, An irradiation position adjustment table is constituted by a maximum wave height follower which is vertically movably disposed inside the extending seawater storage tank, and a water conduit for connecting the seawater storage tank to the sea is provided on the average sea level follower. You may. In this case, the final output section of the laser emitting device is installed on the maximum wave height follower.

When such a configuration is applied, fluctuations in the level of seawater can be dealt with in the same manner as described above. Further, when there is a partial rise in the sea level due to the waves, the seawater enters the seawater storage tank inside the mean sea level follower through the headrace provided in the mean sea level follower, and the seawater storage tank The maximum wave-height follower in the area is pushed upward relatively with respect to the average sea-level follower. As a result, even when there is a partial rise in the sea level due to the waves, the relationship between the laser light emitted from the final output section of the laser emitting device and the height of the sea level (wave crest) is always constant regardless of the size of the waves. It is kept in a certain state. Therefore, the laser light is always scattered at a position slightly higher than the wave front, making effective use of fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser light, that is, the route end line can be easily visually observed. become able to.

In the case where the irradiation position adjusting table is configured by using the average sea level follower and the maximum wave height follower, the waterway of the average sea level follower is compared with the speed at which seawater enters the seawater storage tank from the sea. It is desirable to provide a delay valve to slow the rate of discharge of seawater from the seawater reservoir to the sea.

By extending the time during which the seawater in the seawater storage tank flows into the sea by the delay valve, the position (height) of the maximum wave height follower can be latched for a predetermined time according to the height of the wave crest. Become. Therefore, even when the sea surface has severe wave irregularities, the relationship between the laser light emitted from the final output portion of the laser emitting device and the height of the wave front can be always kept constant, The laser light is always scattered at a position slightly higher than the wave front, making effective use of fine droplets of seawater rolled up from the sea surface, so that the trajectory of the laser light, that is, the route end line, can be easily viewed. become.

Here, when the headrace is constituted by the first headrace with a large diameter and the second headrace with a small diameter, the above-mentioned delay valve permits the entry of seawater in the first headrace. It can be constituted by a one-way valve that opens only in one direction.

If such a structure is applied, when the waves come, the seawater will suddenly flow into the seawater storage tank via the first waterway and the second waterway, delaying the generation of waves. It is possible to raise the maximum wave height follower. Further, when seawater flows out of the seawater storage tank into the sea due to the arrival of the wave trough, the discharge of seawater from the first water conduit is prohibited by the operation of the one-way valve, and the second water conduit having a small diameter is provided. Since only discharge of seawater from the water channel is permitted, the descending speed of the maximum wave height follower can be reduced. As a result, the position of the maximum wave height follower is maintained almost stably according to the height of the wave front. Therefore, the laser light is always scattered at a position slightly higher than the wave front, making effective use of the fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser light, that is, the route end line can be easily observed. it can.

Further, when the headrace is constituted by a single headrace, the headrace may be provided with a one-way valve provided with a small hole and opened only in a direction allowing seawater to enter. I just need.

When such a configuration is applied, when a wave comes in, a one-way valve opens and seawater rapidly flows into the seawater storage tank from the headrace to raise the maximum wave height follower without delaying generation of the wave. be able to. Also, when seawater flows into the sea from the seawater storage tank caused by the arrival of the wave trough, the one-way valve is closed, and the seawater is gradually discharged through small holes provided in the one-way valve. Thus, the descending speed of the maximum wave height follower can be reduced.

Further, a wave height measuring means for measuring the maximum wave height at every predetermined period, and an irradiation position adjusting table is moved at every predetermined period to a position offset by a predetermined amount above the height measured by the wave height measuring means. It is also possible to adopt a configuration in which an adjustment table elevating means for performing the adjustment is provided.

According to such a configuration, the maximum wave height within a predetermined period is measured by the wave height measuring means, and the position is offset by a predetermined amount above the height measured by the wave height measuring means during the next predetermined period. The irradiation position adjustment table is held at the position. The position (height) of the irradiation position adjustment table is adjusted according to the height of the wave front, so that the laser beam is always at a position slightly higher than the wave front, and always enables the fine droplets of seawater rolled up from the sea surface to be effective The laser light is scattered by use, and the trajectory of the laser light, that is, the route end line, can be easily viewed.

In addition to the above components, a buoy equipped with a backstop for blocking the laser beam emitted from the final output section of the laser emitting device is installed substantially fixed on the sea surface, and from the final output section. A buoy tracking device for adjusting the direction of the output laser beam to the buoy may be provided in addition to the laser emitting device.

According to such a configuration, the route end line is displayed only in a required section. Therefore, even if a plurality of route end line display systems are installed in the same sea area, the route end line is displayed. Can be prevented from being difficult to see due to overlapping or crossing of the display.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing an outline of a configuration of a route edge line display system according to an embodiment of the present invention in a plan view from above, and FIG. 2 is a schematic view of a configuration of a route edge line display system of the embodiment. FIG. 2 is a conceptual diagram showing a plan view from the side.

As shown in FIG. 1 and FIG. 2, a navigation line end display system 1 according to this embodiment includes a fixed base 2 fixedly installed on land or the sea floor, and an irradiation position attached to the fixed base 2. It is composed of an adjustment table 3, a buoy tracking device 4, a laser emitting device 5, and a buoy 6 installed substantially fixedly on the sea surface. The buoy 6 is anchored to the seabed 7 via a cable 9, and the slack generated in the cable 9 causes the buoy 6 to slightly float on the sea surface, for example, in a section indicated by a two-way arrow shown in FIG. 1.

The buoy tracking device 4 attached to the laser emitting device 5 observes the position of the buoy 6 and
The attitude (rotation angle about the vertical axis) of the laser emitting device 5 is controlled so that the laser beam 8 always hits the buoy 6.
Since the floating range of the buoy 6 is very small,
The change in the attitude of the laser emitting device 5 does not affect the display of the route end line by the laser light 8. The buoy 6 receives the laser beam 8 on its own surface serving as a backstop, and prevents the laser beam 8 from being radiated more than necessary. The laser emitting device 5 has an output and a beam diameter in consideration of eye safety and the like, and generally has a blinking function for ensuring safety and visibility.

Next, the structure of the irradiation position adjusting table 3 which moves up and down following the height of the sea surface will be described in detail. FIG. 3 is a conceptual diagram showing a cross section of the irradiation position adjusting table 3 in a simplified structure.

As shown in FIG. 3, the irradiation position adjusting table 3
Is a pipe 10 supported by the fixed base 2 and vertically installed in communication with the sea, a buoyant average sea level follower 11 disposed vertically movably inside the pipe 10, an average sea level A maximum wave height follower 13 movably arranged vertically inside a seawater storage tank 12 provided inside the high follower 11. A seawater storage tank 12 is provided on the lower surface side of the average sea level follower 11. A water conduit 14 is provided for communicating the water to the sea.

The water conduit 14 is a first water conduit 1 having a large diameter.
The first water conduit 14a is provided with a one-way valve 15 serving as a delay valve.

As shown in FIG. 3, this one-way valve 15 permits only the ingress of seawater from the sea to the seawater storage tank 12 and prohibits the outflow of seawater from the seawater storage tank 12 to the sea. Accordingly, there is a function of delaying the speed of discharging seawater from the seawater storage tank 12 to the sea as compared with the speed of seawater entering the seawater storage tank 12 from the sea.

Among the components of the irradiation position adjusting table 3, the average sea level follower 11 has a function of adjusting the vertical position of the laser emitting device 5 according to the average water level of the sea surface. Has a function of adjusting the vertical position of the laser emitting device 5 according to the maximum height of the wave front on the sea surface.

Next, the function and operation of the irradiation position adjusting table 3 will be described in detail with reference to FIGS. 4 (a) and 4 (b).

First, when there is almost no wave and the average water level on the sea surface fluctuates at a slow pace due to ebb and flow of the tide, for example, as shown in FIG. The average sea level follower 11 having buoyancy moves up and down along the pipe 10 according to the average water level of the sea surface by its own buoyancy while the sea level of the seawater coincides with the average sea level. 13, the height of the laser emitting device 5 installed on the average sea level follower 11 via the irradiation position adjusting stand 3 and the buoy tracking device 4 is at a constant distance from the sea surface, for example, in a range of about 50 cm to 2 m. Preferably, 50
laser emitting device 5 so as to be in the range of about cm to 1 m.
Adjust the position of.

Here, when a high wave rises and the wave front becomes higher than the average water level on the sea surface, for example, as shown in FIG. 4B, the first headrace 14a and the second headrace 14a connected to the sea are connected. Seawater enters through the water conduit 14b, pushes up the one-way valve 15, and the seawater enters the seawater storage tank 12.

As a result, the average sea level follower 1 reaches a height at which the level of seawater in the seawater storage tank 12 coincides with the height of the crest.
1, the maximum wave height follower 13 is pushed up, and the height of the laser emitting device 5 installed on the maximum wave height follower 13 via the irradiation position adjusting table 3 and the buoy tracking device 4 is constant to the maximum height of the wave front. , For example, in the range of about 50 cm to 2 m, and more desirably, in the range of about 50 cm to 1 m.

At this time, the one-way valve 15 is easily opened without resistance, and the position of the laser emitting device 5 can be raised by the intrusion of seawater without delaying the generation of the wave. There is no worry about sinking.

After that, the high waves pass and the seawater storage tank 1
When the level of seawater in 2 becomes relatively higher than the crest,
The seawater in the seawater storage tank 12 has a small diameter second headrace channel 1
It will be gradually discharged into seawater via 4b,
At this time, since the one-way valve 15 is closed by the weight of the seawater in the seawater storage tank 12, the first water conduit 1 having a large diameter is used.
The seawater in the seawater storage tank 12 is not discharged through 4a, and for some time, the level of the seawater in the seawater storage tank 12 is substantially equal to the maximum height of the crest of the wave generated immediately before. Will be held in the state.

That is, the water level of the seawater in the seawater storage tank 12 does not rise and fall with the wave, but follows only the maximum height of the wave crest generated in the immediately preceding certain time zone.

In this manner, the level of seawater in the seawater storage tank 12 is maintained (latched) in the substantially same state until the next wave arrives. Therefore, even when high waves frequently come, laser emission is performed. There is no worry that the device 5 sinks between the waves.

Then, when the high waves subside, finally,
Over a certain period of time, the seawater in the seawater storage tank 12 flows out to the sea through the small-diameter second water conduit 14b, and again, for example, as shown in FIG. Of the seawater in the sea coincides with the average water level of the sea surface, and the height of the laser emitting device 5 is set at a certain distance from the sea surface, for example, 5
0 cm ~ 2 m range, more preferably 50 cm ~
It is held so as to be within a range of about 1 m. If the diameter of the second water conduit 14b is large, the seawater in the seawater storage tank 12 is drained more quickly than necessary, and the level of the seawater in the seawater storage tank 12 does not match the maximum height of the crest. The diameter of the second conduit 14b needs to be extremely small so that the seawater in the tank 12 is drained slowly.

As described above, the height of the laser emitting device 5 is always kept at a constant distance from the sea surface, for example, 50 cm from the sea surface.
Since it is held so as to be in the range of about 2 m, more preferably in the range of about 50 cm to 1 m, the laser light 8 emitted from the laser emitting device 5 is always at a position slightly higher than the sea surface, The water droplets are effectively scattered by effectively utilizing the fine droplets of seawater that are rolled up from the sea surface.
The upper occupant can easily see the trajectory of the laser beam 8, that is, the route end line.

Also, in the above-described configuration, the second water conduit 1
4b is omitted and only the first water conduit 14a is provided, and the one-way valve 15 is provided with a small hole.
In addition, a delay function for delaying the speed of discharging seawater from the seawater storage tank 12 to the sea as compared with the speed of seawater entering the seawater storage tank 12 from the sea may be provided.

When such a configuration is applied, when seawater enters the seawater storage tank 12 from the sea, as described above,
Since the one-way valve 15 is easily fully opened, the intrusion of seawater is promptly achieved, and when seawater is discharged from the seawater storage tank 12 into the sea, one-way operation is performed due to the weight of the seawater in the seawater storage tank 12. Since the directional valve 15 is closed, the seawater storage tank 12 is closed.
Is slowly discharged through the small hole of the one-way valve 15. The function and effect accompanying this are the same as described above.

Although there is a difference depending on various conditions, when the laser beam 8 is propagated in the most desirable height range of 50 cm to 1 m from the wave front, the laser beam 8 is propagated as compared with the case where the laser beam 8 is propagated at several meters. The amount of the scattered light obtained from is several times.

Therefore, if the output of the laser emitting device 5 is made the same as the conventional one, the visibility from the ship 16 is improved several times. Conversely, if the same visibility as the conventional one is sufficient, the laser emission is improved. The output of the device 5 can be lower than that of the conventional product. If the output of the laser emitting device 5 is reduced, power consumption can be reduced. In particular, as in the case where the laser emitting device 5 is mounted on the fixed base 2 fixed to the sea floor, sufficient power is not necessarily provided. The power saving effect is great under the situation where it cannot be obtained. In addition, since the output of the laser emitting device 5 can be reduced in this way, safety for eyes is sufficiently ensured. Further, since the optical path of the laser beam 8 is held at a position where the sea surface is extremely low, there is no danger that the eyes of the crew or passengers of a medium or larger vessel are directly exposed to the laser beam 8, and the small cruiser Even in the case of a crew member or a passenger of a fishing boat or the like, there is almost no concern that the naked eye is directly exposed to the optical path of the laser beam 8. The synergistic effect of the reduction in the output of the laser emitting device 5 and the reduction in the height of the optical path of the laser light 8 makes it possible to reliably guarantee the safety of the crew and passengers of the ship.

In the above-described embodiment, the laser emitting device 5
Was arranged on the irradiation position adjustment table 3,
It is also possible to adopt a configuration in which only the final output portion of the laser emitting device 5, for example, only the reflecting mirror is placed on the irradiation position adjusting table 3, and the laser light from the separately provided laser emitting device 5 is guided to this reflecting mirror. It is.

The main purpose of applying the laser beam 8 to the buoy 6 serving as a backstop is to block the laser beam 8 from going to unnecessary places.
Is completely fixed, or when the laser beam 8 can be blocked by another method, the buoy tracking device 4 becomes unnecessary.

Next, a brief description will be given of an example of another embodiment. FIG. 5 is a wave height measuring means for measuring the maximum wave height for each predetermined period, and a height adjusting means for moving the irradiation position adjusting table to a position offset by a predetermined amount above the height measured by the wave height measuring means; It is the conceptual diagram which simplified the structural example of the route end line display system 17 provided with, and showed it planarly from the side.

In this embodiment, the wave height is measured by the wave height measuring device 18 as the wave height measuring means, and the height control device 19 as the adjusting platform elevating means is controlled accordingly, so that the wave height is kept constant with respect to the wave front. A laser beam 8 is emitted at the height.

The wave height measuring device 18 measures the wave height at a predetermined position, for example, at every sampling period Δt, and determines at least the maximum value of the wave height detected during the predetermined period ΔT (ΔT> Δt). It has a function of storing and holding only during ΔT, and a height control device 1 as an adjusting base elevating means.
9, a position higher than the maximum value of the wave height held by the wave height measuring device 18 at that time by a predetermined amount, for example, 50 cm to
There is a function to move the reflection mirror 21 which is the final output part of the laser emitting device 5 to the most desirable position 1 m higher. The reflecting mirror driving unit 20 in this embodiment includes the reflecting mirror 2
Also serves as an irradiation position adjustment table that supports 1. The refraction mirror 22 is a relay unit for guiding the laser beam from the laser emitting device 5 to the reflection mirror 21.

Route end line display system 17 of this embodiment
Is as follows.

First, the wave height measuring device 18 which measures the instantaneous height of the sea surface by measuring the reciprocating time of the ultrasonic wave, the semiconductor laser light, etc. to the sea surface, measures the time zone, that is, the immediately preceding Δ.
Detect the highest crest height during T.

Next, the periscope-shaped height control device 19 is driven so that the laser beam 8 becomes higher than this position by a certain value, for example, 50 cm to 1 m, which is the most desirable height. The height of the reflection mirror 21 as an output unit is adjusted.

Then, the laser beam from the laser emitting device 5 fixed on the ground is applied to the reflection mirror 21 via the refraction mirror 22.

Further, based on a tracking signal obtained by a buoy tracking device (not shown), a reflector driving unit 2 also serving as an irradiation position adjusting table.
The laser beam 8 is applied to the buoy 6 by controlling the driving of the laser beam 0 to swing the reflection mirror 21 around the vertical axis.

By repeatedly performing the above-described processing operations, the height of the reflecting mirror 21 constituting the final output unit of the laser emitting device 5 is always kept at a constant distance from the sea surface, for example,
The laser light 8 which is held so as to be within the most desirable height range of about 50 cm to 1 m with respect to the sea surface, and which is irradiated from the reflection mirror 21 is always slightly higher than the sea surface, and the seawater always wound up from the sea surface Scattering is achieved by effectively utilizing fine droplets.

Further, in the embodiment shown in FIG.
Since the device is not in contact with the sea surface at all, there is an advantage that it is not necessary to consider the attachment of shellfish and the like that occurs when the device is installed in the sea.

[0057]

The route line display system according to the present invention has the following features.
An irradiation position adjustment table that moves up and down at a position higher than the sea surface by a predetermined amount according to the height of the sea surface is provided, and at least a final output unit of a laser emitting device that irradiates laser light is installed on the irradiation position adjustment table. Therefore, it is possible to always irradiate the laser beam indicating the route end line at a position slightly higher than the sea surface. Therefore, the laser light can be scattered by effectively using the fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser light, that is, the route end line can be easily observed.

The irradiating position adjusting table is constituted by a buoyant average sea level follower having a buoyancy and movably disposed in a vertically installed pipe body connected to the sea. The height of the laser beam with respect to the sea surface can be automatically adjusted according to the fluctuation of the seawater level due to ebb and flow.Furthermore, the average sea level follower is provided with a seawater storage tank and a water channel, and the maximum wave height is tracked. Since the body is installed, the relationship between the laser beam emitted from the final output part of the laser emitting device and the height of the wave crest is always approximately even if the sea level rises partially due to waves. It can be kept in a certain state.

Further, when the irradiation position adjusting table is constituted by using the average sea level follower and the maximum wave height follower, the seawater from the sea to the seawater storage tank enters the waterway of the average sea level follower. A delay valve is provided to delay the speed of discharging seawater from the seawater storage tank to the sea compared to the speed, so the position (height) of the maximum wave height follower can be set for a predetermined time according to the height of the crest. Can be latched. Therefore, even when the sea surface has severe wave irregularities, the relationship between the laser light emitted from the final output portion of the laser emitting device and the height of the wave front can be always kept constant, The laser light is always scattered at a position slightly higher than the wave front by effectively using fine droplets of seawater wound up from the sea surface, and the trajectory of the laser light, that is, the route end line can be easily visually observed. As the distance between the wave front and the propagation path of the laser light is kept almost constant, when the wave is high, there is a concern that the distance between the laser light and the sea surface will increase at places other than the wave front and the scattering rate of the laser light will decrease. However, in a state where the wave height is high and the sea is rough, fine droplets also rise to a high level, so that the rate of scattering of laser light does not decrease. Therefore, in any case, it is possible to provide a route end line display system in which the ratio of scattering of the laser beam is increased.

Further, a wave height measuring means for measuring the maximum wave height every predetermined period, and an irradiation position adjusting table is moved every predetermined period to a position offset by a predetermined amount above the height measured by the wave height measuring unit. In the case where the adjusting table elevating means is provided, the maximum wave height within a predetermined cycle is measured by the wave height measuring means, and is offset by a predetermined amount higher than the height measured by the wave height measuring means during the next predetermined cycle. The laser beam is always scattered at the position slightly higher than the wave front, making effective use of the fine droplets of seawater rolled up from the sea surface, and the trajectory of the laser beam That is, the route end line can be easily observed.

Further, a buoy provided with a backstop for blocking the laser beam emitted from the final output section of the laser emitting device is installed substantially fixed on the sea surface, and the laser beam output from the final output section is provided. Since the buoy tracking device for aligning the direction with the buoy is installed in the laser emitting device, the route end line is displayed only in the required section, and multiple line end line display systems can be installed in the same sea area. Even if it is installed in the route, it is possible to prevent the display of the route end lines from overlapping or intersecting, making it difficult to see.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an outline of the configuration of a route end line display system according to an embodiment to which the present invention is applied in a plan view from above.

FIG. 2 is a conceptual diagram showing a schematic configuration of the route end line display system of the embodiment as viewed from the side in a plan view.

FIG. 3 is a conceptual diagram showing a simplified cross-sectional view of a structure of an irradiation position adjusting table in the navigation terminal display system of the embodiment.

FIG. 4 (a) is an operation principle diagram showing an operation state of the irradiation position adjusting table when the wave is low, and FIG. 4 (b) shows an operation state of the irradiation position adjusting table when the wave is high. FIG.

FIG. 5 is a conceptual diagram schematically showing a configuration of a route end line display system according to another embodiment of the present invention in a plan view from the side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Navigation end line display system 2 Fixed stand 3 Irradiation position adjustment stand 4 Buoy tracking device 5 Laser emitting device 6 Buoy 7 Sea floor 8 Laser light 9 Cable 10 Tube 11 Average sea level follower 12 Seawater storage tank 13 Maximum wave height follower 14 Headrace 14a First headrace 14b Second headrace 15 One-way valve (delay valve) 16 Vessel 17 Navigation end line display system 18 Wave height measuring device (wave height measuring means) 19 Height control device (adjusting platform elevating means) Reference Signs List 20 reflection mirror driving unit 21 reflection mirror (final output unit of laser emitting device) 22 refraction mirror

Claims (8)

[Claims] 1. A route end line display system that irradiates a laser beam along a sea surface and scatters it in the air to visually display a route end line, wherein the system follows a height of the sea surface to be higher than the sea surface. An irradiation position adjusting table that moves up and down at a position higher by a predetermined amount is provided, and on this irradiation position adjusting table, at least a final output unit of a laser emitting device that irradiates the laser beam is installed. system. 2. The irradiating position adjusting table is constituted by a buoyant average sea level follower having a buoyancy and vertically movable inside a pipe installed vertically in communication with the sea. The route end line display system according to claim 1, wherein 3. The irradiating position adjusting table includes a buoyant mean sea level follower disposed vertically inside a pipe vertically connected to the sea, and the mean sea level follower. And a maximum wave height follower which is provided inside and vertically movably disposed inside a vertically extending seawater storage tank.The average sea level follower is connected to the sea through the seawater storage tank. 2. The channel end line display system according to claim 1, wherein the headrace is provided, and a final output section of the laser emitting device is installed on the maximum wave height follower. 4. A delay valve for delaying the speed of discharging seawater from the seawater storage tank to the sea compared to the speed of seawater entering the seawater storage tank from the sea, wherein the waterway is provided with a delay valve. The route end line display system according to claim 3, characterized in that: 5. The water conduit is composed of a first water conduit with a large diameter and a second water conduit with a small diameter, and the delay valve allows seawater to enter the first water conduit. The route end line display system according to claim 4, wherein the system is constituted by a one-way valve that opens only in the direction. 6. The headrace is constituted by a single headrace, and a one-way valve provided with a small hole and opened only in a direction allowing seawater to enter is provided in the headrace. The route end line display system according to claim 4, wherein 7. A wave height measuring means for measuring a maximum wave height every predetermined period, and said irradiation position adjusting table every predetermined period to a position offset by a predetermined amount higher than the height measured by said wave height measuring unit. 2. The route end line display system according to claim 1, further comprising: an adjusting platform elevating means for moving the route. 8. A buoy having a backstop for blocking laser light emitted from the final output section is provided substantially fixedly on the sea surface, and the laser emitting device has an output from the final output section. A buoy tracking device for adjusting the direction of the laser beam to be adjusted to the buoy is provided in combination with the buoy. A route end line display system according to any one of claims 7 to 13.