KR101870559B1 - A direct solar radiation meter - Google Patents

Abstract

The present invention relates to a pyrheliometer, and the objective of the present invention is to enhance convenience in manufacturing and assembly due to simplicity of configuration with respect to components of a housing, first and second scattering housings, first and second focus filters, first and second sockets, and first and second covers, so as to reinforce product competitiveness due to reduction of manufacturing costs. To this end, the pyrheliometer comprises: the housing (10); the first scattering housing (20) with a predetermined length disposed on the inner front side of the housing (10); the second scattering housing (30) with a predetermined length disposed on the inner rear side of the housing (10); the first focus filter (40) disposed between the first and second scattering housings (20, 30) to shield sunlight at a predetermined size; the second focus filter (50) formed at the rear end of the second scattering housing (30) and inputting the sunlight into only a first measurement incident hole (56) formed on one side; the first cover (60) fixed in the front side of the housing (10) to apply shield power to the housing (10); the first socket (70) formed between the first cover (60) and the first scattering housing (20) to support the first scattering housing (20) in order to maintain a state of being stably fixed in the housing (10); the second cover (80) fixed in the rear side of the housing (10) to apply shield power to the housing (10) and having a thermopile sensor (4) formed therein; and the second socket (90) having the second focus sensor (50) formed on one end.

Description

A direct solar radiation meter

The present invention relates to a direct sunlight, and more particularly, to a direct sunlight system that includes a housing, first and second scattering housings, first and second focus filters, first and second sockets, The present invention relates to a direct sunlight which enhances the competitiveness of a product by lowering the manufacturing cost by improving the simplicity of manufacture and assembly by simplifying the configuration of the components.

In general, the energy emitted from the sun toward the earth is called 'solar radiation', which plays a very important role in the measurement of radiant energy or radiant energy of meteorological observations. Radiation energy measurement is a fundamental observation In addition to meteorological and agricultural fields, solar radiation is one of the most important environmental factors that have a profound influence on global environment and plant growth.

Such a mechanism for measuring the intensity of solar energy, that is, solar radiation, is generally referred to as a "solar system," which is largely divided into four seasons and a direct sun system.

The quadrangular pyramid is divided into four phases using a thermocouple and a bimetal, which measures the solar radiation and the scattered light of the whole sky through a horizontally placed light receiving surface.

The direct sunlight is a collective term of a radiometer for measuring the direct sunlight intensity. The direct sunlight ray is provided with an induction device for measuring the intensity of direct sunlight coming from the sun in the lower part of the cylinder. It is an open circle.

This direct sunlight is classified into types according to the sensitive device, and it is a black calorimetric system. It shows the radiant energy intensity by measuring the temperature of the water which is absorbed by the water when the sun is exposed.

Or, the blackened heat capacity of a large plate, which means that when the direct sunlight reaches the plate in a time shorter than the thermal time constant, the temperature of the plate rises with the intensity of the light reaching the plate.

Or, as a pair of plates, the plate is painted black, and the rest is reflected in successive incoming sunlight, and the temperature difference between the two plates is proportional to the strength of the sunlight.

In other words, the direct sunlight is to measure the amount of solar radiation directly reaching from the sun by an induction action by a thermoelectric sensor provided inside, while the light receiving surface is always set perpendicular to the sunlight. In this case, the general solar system uses a one-minute average value at intervals of 1 second, and the energy industry uses a cumulative value of one hour or one day.

On the other hand, the thermoelectric sensor applied to the solar system has a wavelength range of 300 to 3,000 nm according to the WMO regulations, and has a regulation on the cosine performance and the response speed in the angle slope, and more importantly, Therefore, the energy for solar heat is converted into W / m2 by outputting an electromotive force, which is commonly referred to as a thermocouple thermometer, that is, a thermocouple or a summer module . Such a thermocouple is widely applied to a variety of solar systems such as Korean Registered Patent No. 1307908 (a device for calculating the solar radiation reaching the surface of the earth).

This direct sun system 1 requires a scattering housing 2 for direct sunlight guidance to measure only direct sunlight and to remove scattered sunlight as shown in Figure 1 and also requires efficient scattering photovoltaic removal The focus filter 3 is composed of several black tubes having different hole sizes.

In addition, a thermoelectric sensor 4 is formed at one end of the direct sunlight 1. The thermoelectric sensor 4 is a thermoelectric element in which several tens to several hundreds of thermocouples are connected in series. When two kinds of metals having different characteristics are connected in series and heat is applied, an electromotive force is generated due to the temperature difference between the two metals. And the sensor value is obtained by the difference of the thermal conductivity and the electromotive force depending on the metal material. In addition, the thermoelectric sensor may be coated with carbon or graphite in order to maximize the solar absorption rate.

Also, as shown in Fig. 2, the direct sunlight 1 is mounted on the sun tracking device 5 so that the sunlight is always irradiated on the straight line.

However, in the conventional direct sunlight system, there is a difference in direct mail efficiency according to a method of setting a reference point for maintaining a straight line state with the sun, and a configuration is required so that such reference point setting can be performed easily and effectively .

Korean Patent Publication No. 1307908 (published on September 26, 2013) Korean Patent Publication No. 1607438 (published on Apr. 11, 2016)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and it is an object of the present invention to provide an optical scanning device, which comprises a housing, first and second scattering housings, first and second focus filters, first and second sockets, And the simplicity of the configuration of the components of the second cover improves the simplicity of manufacture and assembly, thereby reducing the manufacturing cost and enhancing the competitiveness of the product.

According to an aspect of the present invention, there is provided a portable terminal comprising: a pipe-shaped housing having an interior perforated therein; A first scattering housing having a predetermined length located on an inner front side of the housing; A second scattering housing having a predetermined length located on an inner rear side of the housing; A first focus filter positioned between the first and second scattering housings to shield sunlight to a predetermined size; A second focus filter disposed at a rear end of the second scattering housing so as to be incident only on a first measurement incident hole formed on one side; A first cover fixed to the front of the housing to apply a sealing force to the housing; A first socket formed between the first cover and the first scattering housing to support the first scattering housing so as to be stably fixed to the housing; A second cover fixed to the rear of the housing to apply a sealing force to the housing and having a heat transfer sensor inside; And a second measurement incidence hole is formed on a straight line with the first measurement incidence of the second focus filter while the second focus filter is configured at one end and the second scattering housing is stably held in the housing, And a second socket for supporting the thermally conductive sensor incorporated in the second cover so that measurement can be stably performed.

In the present invention, the first focus filter includes first and second incident holes; The first incident hole is formed to have a predetermined size; The second incident hole may be formed to have a shape that is expanded from one end to the other end of the first incident hole so as to prevent the incident light from being retroreflected according to the positional movement.

In the present invention, a coupling hole is formed in the rear inner side of the housing; Wherein the coupling hole includes at least one alignment groove formed in a predetermined length; And a second coupling protrusion inserted into a coupling hole of the housing at one side of the second socket; Wherein the second engaging protrusion has a predetermined depth and is aligned by the interaction with the alignment groove of the engaging hole so as to stably acquire the sensor value in the thermally conductive sensor built in the second cover And an alignment groove.

In the present invention, the second cover may be provided with a fastening hole for allowing the accommodating space, in which the thermoelectric sensor is housed, to communicate with the outside; And a connector portion for supporting the thermoelectric sensor so as to be connected to the outside; Preferably, the fastening hole includes a moisture-proofing cover on the inner side and a moisture-proofing socket on one end thereof, so that the moisture-proofing cover is fixed to the inside of the housing as well as the receiving space of the first cover.

In the present invention, the housing includes a raised portion formed at each of both ends at a predetermined length; And a sighting space formed on the ridge portion at a same center line and formed with a predetermined size and depth so that a certain amount of sunlight is incident; The first cover and the second cover, which are fixed to both ends of the housing, are provided on the same coaxial line with the boresight space to discriminate whether a through hole having a size smaller than the boresight space is formed and coincided with the sun .

According to the present invention there is provided a method of designing a filter for a filter, comprising a housing, first and second scattering housings, first and second focus filters, first and second sockets, By improving the simplicity of manufacturing and assembling, the manufacturing cost is lowered, thereby enhancing the competitiveness of the product.

In addition, by providing a positioning hole in each of the housing and the second socket and a roughness in each of the first and second covers, it is possible to improve accuracy between components and obtain a more accurate sensor value.

1 is a schematic diagram schematically showing a configuration of a general direct sunlight system.
FIG. 2 is a schematic view showing a general direct sunlight mounted on a solar tracking device. FIG.
3 is an assembled perspective view of a direct sunlight according to the present invention.
4 is an exploded perspective view of a direct sunlight according to the present invention.
5 is an assembled sectional view of a direct sunlight according to the present invention.
6 is a sectional view of a first cover and a first socket according to the present invention.
7 is an exploded cross-sectional view of the first and second scattering housings according to the present invention.
8 is an exploded cross-sectional view of a housing and a second socket according to the present invention.
9 is a sectional view of a second cover and a moisture-proof cover according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. (The same reference numerals are used for the same components as the conventional ones, and a detailed description thereof will be omitted).

The direct sunlight of the present invention includes a housing (10).

The housing 10 includes first and second scattering housings 20 and 30 and first and second focus filters 40 and 50 sequentially with reference to the incidence direction of sunlight.

A first cover 60 and a first socket 70 are formed at one end of the housing 10, that is, at an end of the housing 10 where sunlight is initially incident. A second cover 80 is disposed at the other end of the housing 10, And a second socket 90 are formed.

The first cover 60 is formed with a light shielding plate 100 and the second cover 80 is formed with a moisture-proof cover 110.

The housing 10 is generally cylindrical in shape and supports the components.

The housing 10 includes a ridge 12 having a predetermined width and a predetermined length at both ends. In this case, as shown in the figure, the raised portion 12 is formed in a smooth shape in such a manner that it is enlarged to a predetermined size through an inclined surface having a predetermined angle inclination at the center.

In addition, a sighting space 14 is formed at one side of the ridge 12 to support the sunlight so that it can be seen whether the sunlight is incident on the sunlight. In this case, the aiming space 14 is formed so as to coincide with the horizontal center line on the raised portions 12 formed at the opposite ends of the housing 10.

The first and second covers 60 and 80 can be easily assembled to both ends of the housing 10, that is, the end of the protrusion 12.

In addition, an O-ring insertion groove 16 into which an O-ring is inserted is formed at an end of the protrusion 12.

In addition, the housing 10 is formed with an insertion space through which the components are inserted.

The end of the second socket 90 is inserted into the end of the housing 10, that is, the rear end of the housing 10 with respect to the incidence direction. In this case, at least one positioning groove 19 for aligning the engagement position of the second socket 90 is formed in the coupling hole 18.

Further, the housing 10 is formed of a glossy white alumite. Of course, the present invention is not limited thereto, and the housing 10 can be used as long as it can maintain physical characteristics such as durability or abrasion resistance because it forms an outer frame.

The first scattering housing 20 is inserted into the housing 10. The first scattering housing 20 is formed with an incidence space 22 through which solar light is incident. . In this case, the first fastening part 24 is configured to fasten the first focus filter 40.

The second scattering housing 30 is inserted into the housing 10 in the same manner as the first scattering housing 20 to induce smooth incidence of light. The second scattering housing 30 includes an incidence space 32 And a second fastening portion 34 having a certain depth is formed at one end. In this case, a first focus filter 40 is fixed between the first and second scattering housings 20 and 30 by the first and second fastening portions 22 and 32.

A third fastening part 36 is formed at the other end of the second scattering housing 30 so that a part of the second socket 90 having a predetermined depth is fastened and fixed.

Meanwhile, the first and second scattering housings 20 and 30 are formed of black alumite.

The first focus filter 40 is constructed and fixed between the first and second scattering housings 20 and 30 and is a means for primarily adjusting the amount of incident light.

The first focus filter 40 is threaded on the outer periphery so as to be fastened to the first and second fastening portions 22 and 32 of the first and second scattering housings 20 and 30.

In addition, the first and second incident holes 42 and 44 are formed in the first focus filter 40 along the incident direction so that the first incident amount is adjusted.

In this case, the first incident hole 42 has a diameter reduced by 40 to 60% of the diameter of the incident spaces 22 and 32 of the first and second scattering housings 20 and 30, . For example, when the incident light amount is less than 40%, the incident light amount is sharply reduced, and when the incident light amount is more than 60%, the light scattering interference is increased due to a large amount of incident light.

In addition, the second incident hole 44 is formed at the end of the first incident hole 42 with a slope of a certain angle in the form of a fall pipe. This causes the incident light through the first incident hole 42 to cancel out the retroreflection due to the continuous flowing (moving) operation.

One end of the fixing tool is inserted into the first focus filter 40 and fixed to the first focus filter 40 so that screw tightening can be stably performed between the first and second scattering housings 20 and 30. A plurality of fixing grooves are formed.

The second focus filter 50 includes a third incidence hole 52 formed at a predetermined depth along the incidence direction, a first incidence recess 54 formed to the end of the third incidence hole 52, And a first measurement incident hole 56 formed at a spaced apart position.

The third incident hole (52) is expanded in the form of a fall tube to cancel the retroreflection of light. In this case, the size of the third incident hole 52 is reduced by 40 to 60% of the diameter of the first incident hole 42.

In addition, the first insertion groove 54 is extended from the third incident hole 52 to support the second socket 90 so as to be fitted thereto.

The first measurement incident hole 56 is a means for allowing a part of the light filtered through the first focus filter 40 to be incident on the thermoelectric sensor 4 at one end to perform the sensing action. In this case, the first measurement incident hole 56 is formed within the range between the third incident hole 52 and the first insertion groove 54.

In addition, the first measurement incident hole 56 is formed to have a size enough to acquire a sensor value through the action of the heat transfer sensor 4.

The first cover 60 is fastened and fixed to one end of the housing 10, that is, at the front end with respect to the incidence direction. The first cover 60 closes the first end of the housing 10 and has a first scattering housing 20 Is a means for providing a clamping force to support.

The first cover 60 includes a flange portion 62 formed at one end of the housing 10 and having a plurality of fastening holes for fastening and fastening by fastening means and protruding to a predetermined size.

A rough surface 64 is formed at one side of the flange portion 62 so as to aim the straight line of sun directly on the sun.

In addition, a lens 66 is provided at the front end of the first cover 60 to prevent sunlight from easily entering and penetration of foreign matter into the interior.

In addition, a work space 68 such as a circuit board PCB is formed inside the first cover 60 at a predetermined depth from the rear end of the first cover 60.

In addition, the work space 68 is formed with a fourth fastening part 69 formed to have a predetermined depth and to fasten a part of the first socket 70.

One end of the first cover 70 is inserted into the working space 68 of the first cover 60 and the first scattering housing 20 is inserted into the other end of the first cover 60, And the first scattering housing 20 is stably held in the housing 10 by supporting the first scattering housing 20 between the housings 20.

A through hole having a predetermined size is formed in the first socket 70 so that light passes through the center of the first socket 70 and a female screw is formed on the outer periphery of the first socket 70 to be fastened and fixed to the fourth fastening portion 69 of the first cover 60.

The protrusion 72 protrudes by a predetermined length and supports the first scattering housing 20 as the inside of the first scattering housing 20 is inserted into the rear of the first socket 70.

The first socket (70) includes at least one work hole (74) configured to allow a work line or the like extending from a circuit board formed in the first cover (60) to be drawn out.

The second cover 80 is a means for closing one end of the housing 10, that is, a portion located on the rear side with respect to the incidence direction.

The second cover 80 includes a flange portion 82 formed at one end of the housing 10 and having a plurality of fastening holes for fastening and fastening by fastening means and protruding with a predetermined size.

A roughing hole 84 is formed on one side of the flange portion 82 so as to aim the straight line of sun directly on the sun.

That is, when the roughnesses 64 and 84 formed in the first and second covers 60 and 80 coincide with the sun, it is determined that the sun coincides with the fact that no image is formed at any portion do.

In addition, the second cover 80 includes a receiving space 86 in which the thermoelectric sensor 4 is embedded.

The second cover 80 includes a fastening hole 88 to which a moisture-proof cover 110 for preventing moisture is fastened to the thermally conductive sensor 4 housed in the rear of the second cover 80.

The other side of the second cover 80 includes a connector 89 for connection of a work line or the like to be electrically connected to the thermally conductive sensor 4 housed therein.

The second socket 90 is a means for supporting the second scattering housing 30 and the second focus filter 50 built in the housing 10 so as to stably maintain the fixed state.

The second socket 90 has a threaded portion 92 which is fastened and fixed to the third fastening portion 36 of the second scattering housing 30 on one side.

The first engaging protrusion 94 protrudes a predetermined length forward of the threaded portion 92 so that the first inserting groove 54 of the second focusing filter 50 is inserted and fixed.

The second engaging protrusion 96 is inserted into the engaging hole 18 of the housing 10 to maintain the engaged state.

At least one positioning groove 98 having a predetermined depth is formed at one side of the second engaging projection 96.

In this case, when the alignment grooves 19 and 98 formed in the housing and the second engagement protrusions 10 and 96 coincide with each other, the engagement position of the second socket 90 is fixed to the housing 10 Position.

A second measurement incidence hole 91 is formed at one side of the second socket 90 so as to penetrate the first measurement incidence 56 of the second focus filter 50 and the second measurement incidence 91 at a position coincident with the center line.

At least one suction hole 93 is formed in the other side of the second socket 90 so as to prevent moisture from being generated therein through the moisture-proof cover 110.

The light shielding plate 100 is fixed to one end of the first cover 60 through a fastening means such as a setscrew so that light incidence is uniformly maintained.

The moisture-proof cover 110 is fixed to one end of the second cover 80 to prevent moisture from being generated therein.

The moisture-proof cover 110 has a storage space for storing a moisture-proof material such as silica gel inside.

In addition, the moisture-proof cover 110 is threaded to be fastened and fixed to the air intake hole 93 of the second socket 90.

A moisture-proof socket 112 is formed at the other end of the moisture-proof cover 110 to prevent the moisture-proof material stored in the storage space from being arbitrarily dislodged.

In addition, the moisture-proofing socket 112 is formed with a plurality of through-holes for allowing the moisture-proofing cover 110 to easily perform the moisture-proofing function.

In the direct sunlight having the above-described structure, a portion initially incident on the housing 10 is referred to as a forward portion, and a portion opposed thereto is referred to as a rear portion.

A first focus filter 40 is fastened and fixed between the first and second scattering housings 20 and 30 and a first socket 70 is provided on the front side (or front side) of the first scattering housing 20, The protrusions 72 are inserted and coupled to the inside.

Next, a second focus filter (50) and a second socket (90) are assembled to the rear of the second scattering housing (30). At this time, the first measurement incidence hole 56 of the second focus filter 50 and the second measurement incidence hole 91 of the second socket 90 are assembled so as to coincide with the center line. In this case, the second measurement input hole 91 and the intake hole 93 of the second socket 90 are formed to have the same size, so that any one of them is aligned with the first measurement input hole 56 .

The assembled inner penetration is inserted into the housing 10.

At this time, the second engaging protrusion 96 of the second socket 90 rearward of the inner penetration inserted into the housing 10 is inserted into the engaging hole 18 of the housing 10. In this case, the positioning hole 19 of the coupling hole 18 and the positioning hole 98 of the second engaging projection 96 are assembled together.

Thereafter, the second cover (80) is fastened and fixed to the rear of the housing (10). At this time, a thermoelectric sensor 4 is formed inside the second cover 80, and a moisture-proof cover 110 having a moisture-proof material inside and a moisture-proof socket 112 coupled to the fastening hole 88 formed at one end And a connector 89 for electrically connecting the thermoelectric sensor 4 to the other end.

Also, the first cover 60 is fastened and fixed to the front of the housing 10, and the shield plate 100 is fixed to the front of the first cover 60, thereby completing the assembly of the direct sunlight. Of course, the above-described process is merely an example, and various assembling methods can be performed depending on the user.

The operation state of the direct sunlight having the above-described structure will be described below.

First, the direct sunlight is fixed to one side of the sun tracking device 5.

Then, the sun tracking device 5 moves to a position where a straight line with the sun is located.

After the movement, the direct sunlight fixed to one side of the sun tracking device 5 is adjusted so as to be in line with the sun and finally fixed. That is, it is confirmed whether or not the sun and the direct sunlight coincide with each other by confirming whether or not the image is formed on the first and second covers 60 and 80 formed on the first and second covers 60 and 80 of the direct sunlight system .

When the sunlight is incident on the direct sunlight, the first cover 60 is moved through the lens 66 (see FIG. 2) Light is concentrated while passing through the first sockets 70 and the first scattering housing 20 and the first focus filter 40 and the second scattering housing 30 and the second focus filter 50 and the second The sensor value is obtained from the heat transfer sensor 4 through the light incident on the first and second measurement incident holes 56 and 91 of the socket 90.

Therefore, the simplification of the structure improves the simplicity of manufacturing and assembling, thereby reducing the manufacturing cost, and improving the accuracy between the components through the alignment grooves and the rough surface, thereby obtaining more accurate sensor values.

The present invention is not limited to the above-described embodiments, but is merely one embodiment for implementing direct sunlight. It will be understood by those skilled in the art that various changes may be made without departing from the spirit of the invention.

10: housing 12:
14: Aiming space 16: O-ring insertion groove
18: engaging hole 19: positioning alignment groove
20: first scattering housing 22: incidence space
24: first fastening part 30: second scattering housing
32: incidence space 34: second fastening part
36: third fastening part 40: first focus filter
42: First incident ball 44: Second incident ball
50: second focus filter 52: third incidence hole
54: first insertion groove 56: first measurement incidence hole
60: first cover 62: flange portion
64: Working Completion 66: Lens
68: work space 69: fourth fastening portion
70: first socket 72: protrusion
74: work ball 80: second cover
82: Flange 84: Construction completed
86: accommodation space 88: fastening hole
89: connector portion 90: second socket
91: second measurement incident hole 92: thread portion
93: air intake hole 94: first engaging projection
96: second engaging projection 98: positioning slot
100: shading plate 110: moisture-proof cover
112: moisture-proof socket

Claims (5)

A pipe-shaped housing (10) penetrating the inside thereof;
A first scattering housing 20 having a predetermined length located on the inner front side of the housing 10;
A second scattering housing 30 having a predetermined length and positioned on the inner rear side of the housing 10;
A first focus filter (40) positioned between the first and second scattering housings (20, 30) to shield the sunlight to a predetermined size;
A second focus filter 50 formed at the rear end of the second scattering housing 30 so as to be incident only on the first measurement incident hole 56 formed on one side;
A first cover (60) fixed to the front of the housing (10) to apply a sealing force to the housing (10);
A first socket 70 formed between the first cover 60 and the first scattering housing 20 and supporting the first scattering housing 20 to stably hold the housing 10 in a fixed state;
A second cover (80) fixed to the housing (10) to apply a sealing force to the housing (10) and having a heat transfer sensor (4) inside; And
The second focus filter 50 is disposed at one end and supports the second scattering housing 30 to be stably fixed to the housing 10, A second socket 90 for holding a measurement in a stable manner in the thermoelectric sensor 4 built in the second cover 80 by forming a second measurement incidence hole 91 in a straight line with the second measurement socket 56;
And a second light source.
The method according to claim 1,
The first focus filter 40 includes first and second incident holes 42 and 44;
The first incident hole 42 is formed to have a predetermined size;
The second incident hole (44) is formed in a shape that is expanded from one end to the other end of the first incident hole (42) so as to prevent the incident light from being retroreflected according to the positional movement.
A direct sunlight characterized by the fact that.
The method according to claim 1,
A coupling hole 18 is formed in the rear inner side of the housing 10;
The coupling hole (18) includes at least one positioning groove (19) formed to have a predetermined length;
And a second engaging projection (96) inserted into a coupling hole (18) of the housing (10) at one side of the second socket (90);
The second engaging protrusion 96 is formed at a predetermined depth and is aligned by the interaction with the alignment groove 19 of the engaging hole 18, 4) at least one positioning groove 98 for stably obtaining the sensor value;
And a second light source.
[2] The apparatus according to claim 1, wherein the second cover (80)
A fastening hole 88 for allowing the housing space 86 in which the thermoelectric sensor 4 is housed to communicate with the outside; And
And a connector portion (89) for supporting the thermoelectric sensor (4) so as to be connected to the outside;
A moisture-proofing material is installed inside the fastening hole 88 and a moisture-proof socket 112 is formed at one end so that the moisture-proofing action is performed not only in the receiving space 86 of the second cover 80 but also inside the housing 10 (110);
And a second light source.
The method according to any one of claims 1 to 4,
The housing (10) includes a raised portion (12) formed at each end at a predetermined length;
The protruding portion 12 includes a sighting space 14 formed on the same center line and formed with a predetermined size and depth so that a certain amount of sunlight is incident;
The first and second covers 60 and 80 fixed to the both ends of the housing 10 are provided on the same center line with the aiming space 14 and have holes smaller than the aiming space 14 (64) (84) for discriminating whether or not it is formed and coincident with the sun;
And a second light source.

Images