Multipurpose globe model and map projection device

Abstract

The utility model relates to a multipurpose globe model and a map projection device. The multipurpose globe model comprises a semicircular flat plate, an arched flat plate, a circular flat plate, a stabilizing plate and a spherical shell sleeve, a long groove and a short groove are formed in the edge of the circular flat plate and are arranged in the diameter direction of the circular flat plate, a long clamping groove and a short clamping groove are formed in the linear edge of the semicircular flat plate and are both perpendicular to the linear edge of the semicircular flat plate, the long clamping groove coincides with the circle center of the semicircular flat plate, and the short clamping groove coincides with the circle center of the semicircular flat plate. The number of the clamping short grooves is two, the two clamping short grooves are symmetrical about the center of the clamping long groove, the semicircular flat plate and the arched flat plate are clamped on the circular flat plate to form a sphere, the spherical shell sleeve covers the surface of the sphere, and the spherical shell sleeve can achieve state conversion from a plane to a three-dimensional state and from the three-dimensional state to the plane state, so that corresponding knowledge is mastered. The sphere can be converted from a plane component to a three-dimensional component and from the three-dimensional component to the plane component.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of globe, especially to a multipurpose globe model and map projection device. BACKGROUND

[0002] In the teaching and learning of middle school geography, there are many teaching difficulties that need to be assisted by teaching aids and learning aids to solve. For example, the content of longitude and latitude network, spherical surface converted into planar map projection, earth movement, climate type distribution and cause, three circle circulation, etc. are difficult for students to understand and for teachers to teach.

[0003] Although there are many teaching aids and learning aids on the market, few of them can really help students solve thinking points in learning, focus attention, solve pain points, produce happiness and mobilize internal drive in the process of brain and hand operation. Among them, the learning aids for spherical surface and planar surface and map projection are not popular, such as longitude and latitude network and three circle circulation, which are more difficult to understand.

[0004] As for the knowledge point of converting the three-dimensional spherical surface map of the globe into the planar map on the book, students need to use their imagination. On the one hand, it is easy for students to give up and lose interest, and on the other hand, the globe on the market cannot help students convert in the spherical surface, especially from three-dimensional to two-dimensional and from three-dimensional to planar, which is easy to confuse the knowledge point. SUMMARY

[0005] The utility model solves the technical problem that the existing technology lacks three-dimensional to two-dimensional thinking training learning aids and lacks projection learning aids, and provides a multipurpose globe model and map projection device.

[0006] The utility model solves the technical problem by adopting the technical scheme of a multipurpose globe model, a map projection device and a projection learning method, which comprises a semicircular flat plate, an arcuate flat plate, a circular flat plate, a stable plate and a spherical shell cover. The edge of the circular flat plate has a long groove and a short groove, and the long groove and the short groove are arranged along the diameter direction of the circular flat plate. The straight edge of the semicircular flat plate has a clamping long groove and a clamping short groove, and the clamping long groove and the clamping short groove are perpendicular to the straight edge of the semicircular flat plate. The clamping long groove is coincident with the center of the semicircular flat plate, and the clamping short groove is provided with two clamping short grooves which are symmetric about the center of the clamping long groove.

[0007] The semicircle plates and the arc plates are provided in plurality, the long grooves and the short grooves are provided in plurality and uniformly distributed on the circular plate, one short groove is arranged between two long grooves, and one long groove is arranged between two short grooves, the semicircle plates correspond to the long grooves in one-to-one manner, and the arc plates correspond to the short grooves in one-to-one manner;

[0008] The long grooves and the clamping long grooves are engaged with each other, the arc plates are clamped in the short grooves, the stabilizing plates are provided in two and clamped in two clamping short grooves of the semicircle plates at the same time, the upper and lower ends of the arc plates abut against the stabilizing plates when the arc plates are clamped in the short grooves, the semicircle plates and the arc plates are clamped on the circular plate to form a sphere, and the spherical shell is covered on the surface of the sphere.

[0009] Further, U-shaped grooves are arranged on the arc edges of the semicircle plates and the arc plates, and elastic ropes are sleeved on the U-shaped grooves.

[0010] Further, the semicircle plates and the arc plates are provided in 12, the U-shaped grooves are provided in 9, the elastic ropes are sleeved in the U-shaped grooves and correspond to the North Pole, North Latitude 60°, North Latitude 30°, Tropic of Cancer, Equator (0° Latitude), Tropic of Capricorn, South Latitude 30°, South Latitude 60°, South Pole in sequence, and the semicircle plates and the arc plates represent meridians.

[0011] Further, the spherical shell includes a chart layer and a coated paper layer, the chart layer is pasted on the surface of the coated paper layer, the coated paper layer is a polygon, and the chart layer is a plane picture of a semispherical shape after being cut, and the plane picture includes a meridian and latitude grid picture or a globe picture or a climate and ocean current picture.

[0012] Further, when the chart layer is pasted on the coated paper layer, the coated paper layer has an uncovered blank area, the spherical shell is bent in a direction, and the blank area is folded or recessed in the bending direction, the spherical shell is changed from a two-dimensional plane to a three-dimensional semispherical shape and can be covered on the sphere.

[0013] Further, a stand, a column and a support are further included, the stand is perpendicular and penetrates through the circular plate and the stabilizing plate, the column has a through hole and is connected at two ends of the stand, and the column is located in the sphere, and the support has a protrusion, and the sphere is detachably connected on the support through the through hole of the column.

[0014] The utility model further solves its technical problem and adopts the technical scheme that a kind of map projection device of multipurpose globe model, including luminous body, projection circuit and projection piece, the projection circuit includes power supply and switch, the circle center of the circular flat has mounting hole, the luminous body is installed on the mounting hole;The projection piece is conical body, cylinder and rectangular plane, and conical body, cylinder and rectangular plane board are composed of transparent flexible material and nylon buckle, and conical body is formed by crimping by plane sector and the nylon buckle of the side of plane sector, and cylinder is formed by crimping by plane rectangle and the nylon buckle of the side of plane sector.

[0015] Further, it is characterized in that it further comprises a support and an erasable pen, the support is provided with a luminous body, and the luminous body is connected with the projection circuit, and the erasable pen can draw on the transparent flexible material of the conical body, the cylindrical body and the rectangular plane board.

[0016] In summary, the utility model has the following beneficial technical effects:

[0017] 1. The spherical shell cover can realize state conversion from a plane to a solid and from a solid to a plane, and when the student draws on the projection piece and then unfolds it, the student can clearly see the image drawn by himself and compare it with the unfolded spherical shell cover, so as to clearly understand the shortcomings in drawing and master the corresponding knowledge.

[0018] 2. The spherical body can realize state conversion from a plane component to a solid assembly and from a solid assembly to a plane component, and can project the spherical body in combination with the luminous body, so that the drawing on the projection piece is more stereoscopic whether for teaching or comparison, and can be converted from three-dimensional to two-dimensional.

[0019] 3. The spherical body can realize state conversion from a plane component to a solid assembly and from a solid assembly to a plane component, and can project the spherical body in combination with the luminous body, so that the drawing on the projection piece is more stereoscopic whether for teaching or comparison, and can be converted from three-dimensional to two-dimensional. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a half-circular flat schematic diagram of an embodiment of the utility model of a multipurpose globe model;

[0021] Figure 2 is an arcuate flat schematic diagram of an embodiment of the utility model of a multipurpose globe model;

[0022] Figure 3 is a circular flat schematic diagram of an embodiment of the utility model of a multipurpose globe model;

[0023] Figure 4 is a splicing schematic diagram of an embodiment of the utility model of a multipurpose globe model;

[0024] Figure 5is a schematic view of assembling the globe of the multipurpose globe model embodiment of the utility model;

[0025] Figure 6 is a schematic view of unfolding the spherical shell cover of the multipurpose globe model embodiment of the utility model;

[0026] Figure 7 is a schematic view of the spherical shell cover being shrunk into a hemisphere and being sleeved on the globe of the multipurpose globe model embodiment of the utility model;

[0027] Figure 8 is a schematic view of the conical projection of the map projection device embodiment of the multipurpose globe model of the utility model;

[0028] Figure 9 is a schematic view of the cylindrical projection of the map projection device embodiment of the multipurpose globe model of the utility model;

[0029] Figure 10 is a schematic view of the rectangular plane board projection of the map projection device embodiment of the multipurpose globe model of the utility model.

[0030] Mark explanation:

[0031] 1, semicircle flat plate; 101, clamping long groove; 102, clamping short groove; 2, arc flat plate; 3, circular flat plate; 301, long recess; 302, short recess; 4, stable plate; 5, spherical shell cover; 501, chart layer; 502, wrapping paper layer; 503, blank area; 6, U-shaped groove; 7, elastic rope; 8, vertical rod; 9, stand; 10, support; 11, luminous body; 12, projection circuit; 13, projection piece; 131, transparent flexible material; 132, nylon buckle; 14, support. Specific implementation

[0032] The utility model will be further explained in detail in combination with the drawings and embodiments.

[0033] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , the multipurpose globe model of this embodiment includes semicircle flat plate 1, arc flat plate 2, circular flat plate 3, stable plate 4, spherical shell cover 5, vertical rod 8, stand 9 and support 10, wherein semicircle flat plate 1, arc flat plate 2, circular flat plate 3 and stable plate 4 are assembled into a globe, spherical shell cover 5 is covered on the globe, and vertical rod 8 and stand 9 install the globe on support 10.

[0034] Refer to Figure 3 and Figure 4, the circular flat plate 3 is taken as the plug-in base of the sphere, and the edge thereof is provided with long grooves 301 and short grooves 302 arranged along the diameter direction of the circular flat plate 3, the semicircular flat plate 1 is spliced with the circular flat plate 3 through the long grooves 301, and the arc flat plate 2 is spliced with the circular flat plate 3 through the short grooves 302; the long grooves 301 and the short grooves 302 are both provided with 12, and the long grooves 301 and the short grooves 302 are evenly distributed around the center of the circular flat plate 3; the long grooves 301 and the short grooves 302 are alternately arranged in sequence, that is, there is a short groove 302 between two adjacent long grooves 301, and there is a long groove 301 between two adjacent short grooves 302, and the included angle between the long grooves 301 and the short grooves 302 is the same, so that the circular flat plate 3 is equally divided into 24 parts by the long grooves 301 and the short grooves 302, and the included angle between the long grooves 301 and the short grooves 302 is 15°.

[0035] With reference to Figure 1 , Figure 2 and Figure 4 , the straight edge of the semicircular flat plate 1 is provided with a clamping long groove 101 and a clamping short groove 102, and the clamping long groove 101 and the clamping short groove 102 are both perpendicular to the straight edge of the semicircular flat plate 1, wherein the clamping long groove 101 coincides with the radius line of the semicircular flat plate 1 to equally divide the semicircular flat plate 1, the clamping short groove 102 has two symmetrical ones, and the clamping short groove 102 is symmetric about the center of the clamping long groove 101; the clamping long groove 101 of the semicircular flat plate 1 and the long groove 301 of the circular flat plate 3 are mutually engaged to realize the splicing of the two, and the arc flat plate 2 is spliced with the short groove 302 through the flat plate itself to realize the splicing of the two.

[0036] With reference to Figure 4 , Figure 5 , the semicircular flat plate 1 and the arc flat plate 2 are both provided with 12, and are spliced on the long grooves 301 and the short grooves 302 one by one, and then spliced into a sphere; and the arc edge of each semicircular flat plate 1 and arc flat plate 2 is provided with 9 U-shaped grooves 6, and the 9 U-shaped grooves 6 are dispersed on the arc edge and correspond to the positions of the Arctic Circle, the North Latitude 60°, the North Latitude 30°, the Tropic of Cancer, the Equator (0-degree latitude), the Tropic of Capricorn, the South Latitude 60°, the South Latitude 30°, and the Antarctic Circle respectively, and after splicing, there are 24 U-shaped grooves 6 taking the position of the Equator as an example, one elastic rope 7 is sleeved on the 24 U-shaped grooves 6 to represent the Equator (0-degree latitude), and the other 8 positions are also sleeved with elastic ropes 7 to represent different latitudes, and the 12 semicircular flat plates 1 and arc flat plates 2 represent the meridians of the Earth after splicing. In addition, the color of the elastic rope 7 has two kinds, the elastic rope 7 representing the 0-degree, 30-degree, and 60-degree latitudes is one color, the elastic rope 7 representing the 23-point 5-degree and 66-point 5-degree latitudes is another color, and the elastic rope 7 representing the 23-point 5-degree and 66-point 5-degree latitudes is dotted, which represents a dashed line.

[0037] Referring to Figure 4 , the stabilizing plate 4 is provided with two, when 12 half circle plates 1 are assembled on the circular plate 3, the stabilizing plate 4 is then clamped on the clamping short groove 102, and one stabilizing plate 4 is clamped in the clamping short groove 102 of the upper half of the 12 half circle plates 1, and the other stabilizing plate 4 is clamped in the clamping short groove 102 of the lower half; the upper and lower ends of the inner side of the arc plate 2 have recessed portions, the depth and width of which are the same as the clamping short groove 102, so that when the arc plate 2 is inserted on the circular plate 3, the recessed portions can be in abutment with the stabilizing plate 4, thereby reducing the possibility of shaking of the arc plate 2 after assembly, and the elastic rope 7 has the function of binding the half circle plate 1 and the arc plate 2 in addition to representing the weft.

[0038] In this embodiment, the half circle plate 1 is not actually a complete semicircle, but is approximately semicircular, with a central angle of 160° to 180°, and the arc plate 2 is also approximately arc-shaped, with a central angle the same as that of the half circle plate 1, and in addition, the diameters of the half circle plate 1, the arc plate 2 and the circular plate 3 are the same.

[0039] After the half circle plate 1 and the arc plate 2 are assembled on the circular plate 3 to form a sphere, since the central angles of the half circle plate 1 and the arc plate 2 are not 180°, the assembled sphere has a hollow portion. The stand 8 and the column 9 are installed in this portion, the stand 8 simultaneously penetrates the stabilizing plate 4 and the circular plate 3, the column 9 has a through hole and is detachably installed on the stand 8, and the column 9 is in abutment with the stabilizing plate 4 so as to close the two ends of the sphere. The bracket 10 has a protrusion matching the through hole of the column 9, so that the sphere can be detachably connected to the bracket 10 and can rotate. In addition, after the half circle plate 1 and the arc plate 2 are assembled on the circular plate 3, the upper and lower ends form a hollow circular hole for placing the column 9, the diameter of the circular hole is slightly smaller than that of the column 9, so that when the column 9 is placed in the hollow circular hole, the outer circumferential surface of the column 9 is in abutment with the half circle plate 1 and the arc plate 2 and generates outward pressure, and the elastic rope 7 in the U-shaped groove 6 is slightly stretched and generates inward elastic force, thereby ensuring that the elastic rope 7 is as stable as possible in the U-shaped groove 6, and the stability of the sphere is also ensured under the action of the outward pressure and the inward elastic force, that is, the column 9 also has the function of balancing the extrusion from the elastic rope 7, so that the elastic rope 7 in the U-shaped groove 6 is in a stable state, and the sphere is more stable.

[0040] Referring to Figure 6 and Figure 7The spherical shell cover 5 comprises a chart layer 501 and a wrapping paper layer 502, the chart layer 501 is pasted on the surface of the wrapping paper layer 502, wherein the chart layer 501 is a semi-spherical plane picture, the plane picture comprises a longitude and latitude net picture or a globe picture or a climate and ocean current picture, and the plane picture is an irregular shape; the wrapping paper layer 502 is approximately a polygon, and is a twenty-four-sided polygon; when the chart layer 501 is pasted on the wrapping paper layer 502, the wrapping paper layer 502 has an uncovered blank area 503; the spherical shell cover 5 is bent towards a direction, and the blank area 503 is folded or recessed towards the bending direction; the spherical shell cover 5 is changed from a two-dimensional plane into a three-dimensional semi-sphere, and can be just covered on the sphere. In addition, the wrapping paper layer 502 is an aluminum foil tin paper or other materials with elastic shrinkage or elastic memory.

[0041] The map projection device of the multipurpose globe model comprises a light-emitting body 11, a projection circuit 12 and a projection piece 13, a support 14 and an erasable pen, wherein the light-emitting body 11 is installed in the sphere or the support 14, the upper and lower edges of the opening of the clamping long groove 101 of the semicircular plate 1 are each provided with a 1 / 4 circular opening, the center of the circular plate 3 is provided with a mounting hole, the 1 / 4 circular openings of the plurality of semicircular plates 1 leave space in the sphere to install the light-emitting body 11, and the light-emitting body 11 is electrically connected with the projection circuit 12. The projection piece 13 is composed of transparent flexible material 131 and nylon buckle 132, and has three shapes, namely a circular cone, a circular cylinder and a rectangular plane, wherein the circular cone is formed by curling the plane sector and the nylon buckle 132 arranged on the side of the plane sector, the circular cylinder is formed by curling the plane rectangle and the nylon buckle 132 arranged on the side of the plane sector, and the erasable pen can repeatedly draw pictures on the transparent flexible material 131. In addition, the nylon buckle 132 is not necessarily present on the projection piece 13 of the rectangular plane, and the nylon buckle 132 is usually used when it is necessary to be rolled up for convenient storage.

[0042] The projection circuit 12 comprises a power supply, a switch and a wire, the power supply is a 12-volt battery or a rechargeable battery, the switch comprises but is not limited to a common key switch, an electromagnetic relay and a photoelectric switch; in addition, the light-emitting body 11 is an LED lamp and a handheld flashlight (not shown in the figure), the LED lamp is placed in the sphere or the support 14, the support 14 has a pit for placing the sphere, and the sphere can be completely vertically placed without an inclined angle when placed on the support 14, so that students can draw lines on the circular cone, the circular cylinder and the rectangular plane for projection. The handheld flashlight can irradiate from any direction when the sphere is placed on the support 14, which can help students clearly see the content on the cover on the surface of the sphere, and the handheld flashlight can be used to simulate the sun, the handheld flashlight is separated from the sphere by a distance, and the rotation of the earth, the revolution of the earth, the orthographic projection and the spherical projection can be displayed.

[0043] Referring to Figure 8 , Figure 9 and Figure 10 , the projection learning method of the multipurpose globe model map projection device is:

[0044] S1, the semicircular plate 1, the arc plate 2, the circular plate 3, the stable plate 4, the spherical shell sleeve 5 and the luminous body 11 are assembled, the luminous body 11 is connected to the power supply of the projection circuit 12 and powered on to form a luminous sphere;

[0045] S2, the projection piece 13 is covered on the luminous sphere, and the patterns and lines on the spherical shell sleeve 5 are drawn with an erasable pen; when the projection piece 13 adopts a cone, the luminous sphere is lit, the cone is sleeved on the southern hemisphere or the northern hemisphere, the student can draw the lines near the Tropic of Cancer or the Tropic of Capricorn on the globe or the ocean current line on the cone sleeve with an erasable pen, and after drawing, the cone is unfolded into a plane, and the lines near the Tropic of Cancer or the Tropic of Capricorn are converted from a spherical surface to a plane; when the projection piece 13 adopts a cylinder, the luminous sphere is lit, the cylinder is sleeved on the equator (0 degree latitude), the student can draw the lines near the equator on the globe or the ocean current line on the cylinder sleeve with an erasable pen, and after drawing, the cylinder is unfolded into a plane, and the lines near the equator are converted from a spherical surface to a plane; when the projection piece 13 adopts a rectangular plane plate, the luminous sphere is lit, the rectangular plane plate is sleeved on the South Pole or the North Pole, the student can draw the lines near the South Pole or the North Pole on the globe or the ocean current line on the rectangular plane plate with an erasable pen, and after drawing, the lines near the South Pole or the North Pole can be converted from a spherical surface to a plane;

[0046] S3, the nylon buckle 132 is disengaged, and the projection piece 13 is unfolded.

[0047] The above are preferred embodiments of the utility model, and do not limit the protection scope of the utility model. Among them, the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "in" and "out" refer to the directions towards or away from the geometric center of a particular component. Therefore: all equivalent changes made according to the structure, shape and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. A multi-purpose globe model, characterized by, It includes semicircle flat plate (1), arc flat plate (2), circular flat plate (3), stable plate (4) and spherical shell cover (5), the circular flat plate (3) has long recess (301) and short recess (302) at the edge, and the long recess (301) and the short recess (302) are arranged along the diameter direction of the circular flat plate (3), the linear edge of the semicircle flat plate (1) has the clamping long slot (101) and the clamping short slot (102), and the clamping long slot (101) and the clamping short slot (102) are perpendicular to the linear edge of the semicircle flat plate (1), the clamping long slot (101) coincides with the center of the semicircle flat plate (1), the clamping short slot (102) is provided with two, and two clamping short slots (102) are about the clamping long slot (101) center symmetry; The semicircle flat plate (1) and the arc flat plate (2) are provided with multiple, the long recess (301) and the short recess (302) are provided with multiple and are uniformly distributed on the circular flat plate (3), two long recesses (301) are separated by one short recess (302), two short recesses (302) are separated by one long recess (301), the semicircle flat plate (1) corresponds to the number of long recesses (301), and the arc flat plate (2) corresponds to the number of short recesses (302). The long recess (301) and the clamping long slot (101) are engaged with each other, the arc flat plate (2) is clamped in the short recess (302), the stable plate (4) is provided with two, and is clamped in two clamping short slots (102) of multiple semicircle flat plates (1) at the same time, when the arc flat plate (2) is clamped in the short recess (302), the upper and lower ends of the arc flat plate (2) are abutted on the stable plate (4) at the same time, the semicircle flat plate (1) and the arc flat plate (2) are clamped on the circular flat plate (3) to form a sphere, and the spherical shell cover (5) covers the surface of the sphere.

2. A multipurpose globe model as claimed in claim 1, wherein The semicircle flat plate (1) and the arc flat plate (2) are provided with U-shaped grooves (6) on the arc-shaped edges, and the U-shaped grooves (6) are provided with elastic ropes (7).

3. A multi-purpose globe model as claimed in claim 2, wherein, The semicircle flat plate (1) and the arc flat plate (2) are provided with 12, the U-shaped grooves (6) have 9, the elastic ropes (7) are sequentially corresponding to the north pole, north latitude 60°, north latitude 30°, north equator, equator, south equator, south latitude 30°, south latitude 60° and south pole, the semicircle flat plate (1) and the arc flat plate (2) represent the meridian, the elastic ropes (7) have two different colors, the elastic ropes (7) on the south, north 60° and 30° latitude and the equator are the same color, and the elastic ropes (7) on the south, north pole and the equator are the same color.

4. The multipurpose globe model of claim 1, wherein, The spherical shell cover (5) comprises a chart layer (501) and a wrapping paper layer (502), the chart layer (501) is pasted on the surface of the wrapping paper layer (502), the wrapping paper layer (502) is a polygon, and the chart layer (501) is a semi-spherical plane picture cut from a plane picture, which comprises a latitude and longitude grid picture or a globe picture or a climate and ocean current picture.

5. A multi-purpose globe model as claimed in claim 4, wherein, When the chart layer (501) is pasted on the wrapping paper layer (502), the wrapping paper layer (502) has an uncovered blank area (503), the spherical shell cover (5) is bent in a direction, and the blank area (503) is folded or recessed inward in the bending direction, so that the spherical shell cover (5) is changed from a two-dimensional plane to a three-dimensional semi-sphere and can be covered on a sphere.

6. The multipurpose globe model of claim 1, wherein, The stand (8) is vertical and penetrates through the circular plate (3) and the stable plate (4), the column (9) has a through hole and is connected at both ends of the stand (8), and the column (9) is located in the sphere, and the bracket (10) has a protrusion, and the sphere is detachably connected to the bracket (10) through the through hole of the column (9).

7. A map projection device using the multi-purpose globe model according to any one of claims 1 to 6, characterized by The illuminator (11), the projection circuit (12) and the projection piece (13) are included, the projection circuit (12) comprises a power supply and a switch, the circular plate (3) has a mounting hole at the center, and the illuminator (11) is mounted on the mounting hole; the projection piece (13) is a cone, a cylinder and a rectangular plane, the cone, the cylinder and the rectangular plane are composed of transparent flexible material (131) and nylon buckle (132), the cone is formed by winding a plane sector and nylon buckle (132) arranged on the side of the plane sector, and the cylinder is formed by winding a plane rectangle and nylon buckle (132) arranged on the side of the plane sector.

8. A multi-purpose globe model map projection device according to claim 7, characterized in that, The support (14) and the erasable pen are further included, the illuminator (11) is mounted in the support (14) and connected with the projection circuit (12), and the erasable pen can draw on the transparent flexible material (131) of the cone, the cylinder and the rectangular plane.

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