CN223986355U - Projection teaching aid of semitransparent screen - Google Patents

Abstract

The utility model discloses a projection teaching aid of a semitransparent screen, which comprises a light source with adjustable height and a projection device with the semitransparent screen. The height-adjustable light source consists of a strong light flashlight and an X-shaped height-adjusting bracket, and the height of the strong light flashlight can be adjusted by adjusting the X-shaped bracket. The projection device with the semitransparent screen consists of a base, a side view screen, a main view screen, an L-shaped support and a transparent display support, wherein space models such as points, lines, planes and bodies for teaching are placed on the transparent display support, the screens of the side view screen and the main view screen are made of semitransparent materials for displaying projection, the screens are fixed by the movable L-shaped support, the side view screen and the main view screen are connected with the base by hinges, and the projection device can be placed on the base when not used. The projection is generated on the semitransparent screen when the light of the strong light flashlight passes through the space model, and the clear outline of the space model can be seen on the back surfaces of the side view screen and the main view screen.

Description

Projection teaching aid of semitransparent screen

Technical Field

The utility model relates to a teaching aid for teaching or training fields of solid geometry and mechanical drawing, which is used for showing the outline of a space model to students through projection in teaching.

Background

Due to the imagination of the student's brain in spatial locations, special training is required to be able to mature. In the teaching of high-school solid geometry and university mechanical drawing, when a teacher speaks the spatial relative relation among geometric elements such as points, lines, planes, bodies and the like to students, the students can hardly understand due to the immaturity of the spatial imagination capability, and a small number of students feel more pain in learning the course. Therefore, the three-dimensional projection teaching aid is provided, the relative positions of the geometric elements are directly displayed on the projection screen, students can see actual images, and the three-dimensional projection teaching aid is necessary for understanding the shape and the spatial position relation of the geometric elements.

The existing geometrical projection teaching aids in the market are relatively backward, no light source is used for projection, and only the outline of a fixed space model is drawn on a main view projection plane, a side view projection plane and a overlook projection plane, so that the shape and the position of the space model cannot be changed. The disadvantage is obvious because a new geometrical projection teaching aid is needed for changing the space model.

Disclosure of Invention

Therefore, the utility model provides a projection teaching aid with a light source and a semitransparent screen, which utilizes the projection principle of shadow play and can display the projection of a space model in real time, intuitively and dynamically or statically. The teacher is at the time of teaching. The space model with any shape can be adopted for dynamic projection display in real time, any angle is adopted for being placed on the transparent display frame, and light rays project the outer outline of the space model on the main view projection plane, the side view projection plane and the overlook projection plane in real time. If the space model adopts a frame structure, the inner frame wire and the frame wire on the back of the space model can be projected.

The projection teaching aid is shown in fig. 1, and comprises a height-adjustable light source and a projection device with a semitransparent screen, wherein the relative positions of the height-adjustable light source and the projection device can be adjusted according to teaching requirements. The height-adjustable light source consists of a strong light flashlight 7 and an X-shaped bracket 6, and the projection device with a semitransparent screen consists of a base 1, a main view projection surface 2, a side view projection surface 3, an L-shaped bracket 4 and a transparent display bracket 5, and the structures of the two are described one by one.

The projection device with a semitransparent screen is shown in fig. 2, and consists of a base 1, a main view projection surface 2, a side view projection surface 3, an L-shaped bracket 4 and a transparent display bracket 5.

In fig. 2, the transparent display bracket 5 is made of transparent plastic or glass, is in an inverted U shape, and is not fixed on the base 1. On the transparent display bracket 5, various spatial models such as points, lines, planes, bodies and the like are placed according to teaching requirements, and the position of the spatial model must be ensured to be within the irradiation range of the strong light flashlight.

The material structure of the base 1 is shown in a figure 4, and the base consists of a flat plate 11 and a foot pad 12. The flat plate 11 is made of a wood plate or a plastic plate, and 4 foot pads 12 made of rubber materials are fixed at the bottom by screws. The side and bottom of the plate 11 may be perforated and the hinges 24 on the side view screen 2 and the main view screen 3 may be fixed with nails or screws.

The structure of the side view screen 2 and the main view screen 3 in fig. 2 are identical, with only a small difference in size, and only the structure of the side view screen 2 will be described here, the structure of the side view screen 2 being seen in the figure 3.

The side view screen 2 in fig. 3 consists of 1 translucent screen 21, 4 plastic ferrules 22, 1 rectangular wire 23, 2 hinges 24. The rectangular iron wire 23 is made of one iron wire by bending, and the joint is welded to form a closed rectangle. The semitransparent screen 21 is made of semitransparent cloth or plastic film, the transmittance of the material is between 30 and 70 percent, the periphery of the semitransparent screen 21 is sewn or glued on 4 edges of the rectangular iron wires 23, the upper edge of the semitransparent screen 21 is fixed with two ends of the stitching line of the rectangular iron wires 23 by adopting a plastic cutting sleeve 22, and the plastic cutting sleeve 22 and the rectangular iron wires 23 are in interference fit for preventing the cloth from sliding. The lower edge of the semitransparent screen 21 and two ends of the suture of the rectangular iron wire 23 are fixed by a plastic cutting sleeve 22 and a hinge 24.

The hinge 24 of the side view screen 2 in fig. 3 is fixed to the side and bottom of the base 1 by nails or screws, and the side view screen 2 can be laid down on the base 1 when not in use. When not in use, the main screen 3 is laid down on the base 1 in the same manner.

The side view screen 2 and the main view screen 3 are fixed on the side view screen 2 and the main view screen 3 through a movable L-shaped support 4, the structure of the L-shaped support 4 is shown in fig. 5, the side view screen 2 and the main view screen 3 are formed by 2 mutually perpendicular semicircular groove-shaped straight bars, when the side view screen is used, the semicircular groove-shaped straight bars 1 are elastically clamped on a plastic clamping sleeve 22 of the side view screen 2 and the main view screen 3, when the side view screen is not used, the L-shaped support 4 is forcefully taken out of the plastic clamping sleeve 22, and the side view screen 2 and the main view screen 3 can be respectively placed on a base 1.

The strong light flashlight 7 is directly a strong light flashlight sold in the market, and is formed by a circular flashlight and a handle, and is arranged above the X-shaped adjusting bracket 6. According to the difference of the displayed space model heights, the X-shaped bracket 6 rotates around the central line by adjusting the rope length of the lower part of the X-shaped bracket 6, so that the height of the strong light flashlight can be adjusted, light can be opposite to the displayed space model, and the whole outline of the strong light flashlight is projected.

The X-shaped bracket 6 is shown in figure 6 and consists of 2 left side brackets 62, 2 right side brackets 61, 2 pins 63, 2 lower cross bars 64, lower ropes 68, upper semicircular rings 65 and 66 and 4 plastic clamping sleeves 67.

The middle parts of the left bracket 62 and the right bracket 61 in fig. 6 are connected by a pin 63 to rotate around the center line of the pin 63, thereby changing the height of the bracket.

The lower portions of the 2 left brackets 62 in fig. 6 are connected by a rail 64, the lower portions of the 2 right brackets 62 are also connected by another rail 64, the middle portions of the 2 rails 64 are provided with holes, and the ropes 68 are passed through the 2 holes, and the distance between the 2 rails 64 is changed by adjusting the lengths of the ropes 68, thereby adjusting the height of the entire bracket.

In fig. 6, the upper parts of the 2 left side brackets 62 are connected through a semicircular ring 65, and two ends of the semicircular ring 65 are respectively in interference fit by 2 plastic clamping sleeves 67, so that the left side brackets 62 and the semicircular ring 65 are prevented from falling off. The upper parts of the 2 right side brackets 61 are also connected through a semicircular ring 66, and two ends of the semicircular ring 66 are respectively in interference fit by 2 plastic clamping sleeves 67, so that the right side brackets 62 and the semicircular ring 66 are prevented from falling off. The radius of the semi-circular ring 65 and the semi-circular ring 66 are adapted to the outer circular image of the strong light flashlight 7, and are used for placing the strong light flashlight 7.

Drawings

FIG. 1 is a schematic diagram of the whole structure of the utility model, wherein the schematic diagram comprises a base 1, a side view screen 2, a main view screen 3, a L-shaped fixing strip 4, a transparent showing stand 5, an X-shaped bracket 6 and a strong light flashlight 7.

Fig. 2 is a schematic view of a projection device of the translucent screen of the present utility model, and the reference numerals are the same as those of fig. 1.

FIG. 3 is a schematic diagram of a side view screen of the present utility model, wherein 1, the translucent screen 21, 2, the plastic ferrule 22, 3, the rectangular iron wire 23, 4 and the hinge 24.

FIG. 4 is a schematic view of the structure of the base of the present utility model, wherein 1, flat plate 11, 2 and foot pad 12 are shown.

Fig. 5 is a schematic structural view of an L-shaped fixing strip according to the present utility model.

FIG. 6 is a schematic view of the X-shaped bracket of the utility model, wherein 1, a left side bracket 62, 2, a right side bracket 61, 3, a pin 63, 4, a cross bar 64, 5, a rope 68, 6, a semicircle 65, 7, a semicircle 66, 8 and a plastic clamping sleeve 67.

Detailed Description

The utility model is the same as the shadow play principle, when in use, a teacher puts the space model adopted by himself on the transparent showing stand 5 according to the teaching requirement, and the angle and the position of projection are well arranged according to the requirement.

When the space model is required to be projected on the main screen, the strong light flashlight 7 is placed on the X-shaped bracket 6, and the strong light flashlight and the X-shaped bracket are opposite to the space model teaching aid and the main projection screen 3. Then the height of the X-shaped bracket is adjusted, so that the light of the strong light flashlight 7 passes through the space model teaching aid, projection is generated on the semitransparent screen of the main projection screen 3, and students can see the clear outline of the space model teaching aid on the back surface of the main projection screen 3.

If teaching needs to project the outline of the space model on the side view screen 2 and the main view screen projection 3 at the same time, 2 sets of strong light flashlights 7 and X-shaped brackets 6 are needed to respectively face the side view screen 2 and the main view screen projection 3, and projection is performed at the same time.

If teaching requires simultaneous projection of the outline of the spatial model on the main screen projection 3 and projection of the top-view outline of the spatial model on the base 1 (this is less the case), using 1 set of strong-light flashlights 7 and X-shaped brackets 6 to create projection on the main screen projection 3, the teacher holds another strong-light flashlights 7 to direct downward projection of the base 1 over the spatial model, the spatial model outline appears on the base 1, and the student can see the projected outline through the transparent display shelf 5.

By analogy, if projections are to be produced simultaneously in front view, side view, top view, 3 high-intensity flashlights 7 and 2X-shaped holders 6 are required.

If the space model adopts a framework structure (sold in the market), the inner wire and the rear wire of the space model can be projected.

After the teaching is completed, the projection device is required to be folded, the L-shaped fixing strip 4 is forcibly removed, and the side view screen 2 and the main view screen projection 3 are sequentially laid down so that the side view screen 2 and the main view screen projection 3 are overlapped on the base 1. Thus, the side view screen 2 and the main view screen projection 3 are folded to facilitate movement and storage.

Claims (3)

1. The utility model provides a projection teaching aid of semitransparent screen, by base (1), main view projection face (2), look sideways at projection face (3), L shape support (4), transparent show support (5), X shape support (6), highlight flashlight (7) constitute jointly, its characterized in that, main view projection face (2) and look sideways at the screen of projection face (3) and adopted semitransparent material, including cloth and plastic film, the transmittance of material is between 30~ 70%.

2. The projection teaching aid of a semitransparent screen according to claim 1, characterized in that the main view projection surface (2) and the side view projection surface (3) are connected with the base (1) through hinges, when projection is needed, the base (1), the main view projection surface (2) and the side view projection surface (3) are kept at mutually perpendicular positions, and when projection is not used, the main view projection surface (2) and the side view projection surface (3) can be folded and placed on the base (1) in sequence, so that movement and storage are facilitated.

3. The projection teaching aid for the semitransparent screen according to claim 2 is characterized in that when projection is used, the front view projection surface (2) and the side view projection surface (3) are perpendicular to the base (1) in a turned position from the folded position, 2 sides of the L-shaped support (4) are respectively and elastically clamped on the upper parts of the front view projection surface (2) and the side view projection surface (3) to fix the positions of the front view projection surface (2) and the side view projection surface (3), when projection is not used, the L-shaped support (4) can be pulled out from the upper parts of the front view projection surface (2) and the side view projection surface (3) forcefully, and the front view projection surface (2) and the side view projection surface (3) can be folded in sequence.