Small hole imaging teaching aid

Abstract

The utility model discloses a small hole imaging teaching aid, including the casing, the inner wall fixedly connected with the observation seat of casing, the observation seat outer wall fixedly connected with the one side of casing inner wall has the light screen. The utility model relates to teaching aid technical field, this small hole imaging teaching aid, through the cooperation of sealing plate, limit slot, rotary hole disc, light hole, limit block and connecting column, has realized the replacement of different shape small hole according to the teaching need, has effectively solved the limitation that traditional teaching aid can only provide single circular small hole, makes the student to be able to personally verify the core principle of small hole imaging to avoid cognitive partiality, and every time switches light hole, can accurate alignment optical axis, need not repeatedly adjust, saves the classroom teaching time, avoids the experimental error caused by small hole deviation, improves the teaching efficiency, and simultaneously various light hole shapes can also fully stimulate the curiosity of students, significantly improve the participation enthusiasm of students.

Description

Technical Field

[0001] This utility model relates to the field of teaching aids technology, specifically a pinhole imaging teaching aid. Background Technology

[0002] When a plate with a small hole is placed between a screen and an object, an inverted image of the object will be formed on the screen. This phenomenon is called pinhole imaging.

[0003] In traditional pinhole imaging teaching aids, instructors explain the principle of pinhole imaging to students by using a combination of a light source, a pinhole, and a screen. However, in actual teaching, traditional pinhole imaging teaching aids are mostly equipped with only a single-sized circular pinhole in their structural design, and the pinhole components are mostly fixed and non-replaceable. Although they can meet basic teaching needs, they have significant functional limitations in actual teaching scenarios. On the one hand, they cannot verify the core principle that "the shape of the pinhole does not affect the shape of the image," which may lead to a one-sided understanding among students. On the other hand, the traditional plug-in card design is very time-consuming when changing the pinhole, and it is difficult to ensure that the new pinhole is precisely aligned with the optical axis during the plugging and unplugging process, which may cause problems such as offset and blurring, thus interfering with the experimental results. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pinhole imaging teaching aid. It solves the problem that traditional pinhole imaging teaching aids, in practical teaching, mostly only feature a single-sized circular pinhole, and the pinhole components are often fixed and non-replaceable. While these methods can meet basic teaching needs, they have significant functional limitations in actual teaching scenarios. Firstly, they cannot verify the core principle that "the shape of the pinhole does not affect the image shape," potentially leading to a one-sided understanding among students. Secondly, the traditional plug-and-play card design is time-consuming to replace, and it's difficult to ensure precise alignment of the new pinhole with the optical axis during insertion and removal, potentially causing misalignment, blurring, and other problems that interfere with the experimental results. To achieve the above objectives, this utility model provides the following technical solution: a pinhole imaging teaching aid, comprising a housing, an observation seat fixedly connected to the inner wall of the housing, a light screen fixedly connected to the outer wall of the observation seat near the inner wall of the housing, the outer wall of the light screen fitting against the inner wall of the housing, an adjustment seat fixedly connected to the inner wall of the housing away from the light screen, a pattern plate disposed inside the adjustment seat, and a pinhole changing mechanism disposed between the pattern plate and the light screen; the pinhole changing mechanism includes a sealing plate, a limiting groove, a rotating hole plate, a light-transmitting hole, and a limiting block. The sealing plate is disposed between the light screen and the pattern plate. The sealing plate is fixedly connected to the inner wall of the housing. A limiting groove is formed on the outer wall of the sealing plate near the light screen. A rotating perforated plate is disposed between the sealing plate and the light screen. A light-transmitting hole is formed on the outer wall of the rotating perforated plate. A limiting block is fixedly connected to the outer wall of the rotating perforated plate near the sealing plate. The limiting block is inserted into the inner wall of the limiting groove. A connecting column is rotatably connected to the inner wall of the rotating perforated plate through a sealing bearing. The connecting column is fixedly connected between the inner wall of the housing and the sealing plate.

[0005] Preferably, the adjusting seat is provided with an adjusting mechanism; the adjusting mechanism includes an adjusting column, an adjusting ring, a power module, and a mounting base; the outer wall of the adjusting column is threadedly connected to the inner wall of the adjusting seat, the inner wall of the adjusting seat is fitted with the adjusting ring, the inner wall of the adjusting ring is rotatably connected to the outer wall of the adjusting column through a sealed bearing, the side of the outer wall of the adjusting ring away from the adjusting column is fixedly connected to the power module, the outer wall of the power module is fitted with the inner wall of the adjusting seat, the side of the outer wall of the power module away from the adjusting ring is fitted with the mounting base, and the mounting base is sleeved on the outer wall of the pattern plate.

[0006] Preferably, the inner wall of the adjustment seat is provided with a sliding groove, and a slider is slidably connected to the inner wall of the sliding groove. The slider is fixedly connected to the outer wall of the power module.

[0007] Preferably, a fixing clip is fixedly connected to the outer wall of the mounting base near the power module, and a fixing groove is engaged on the outer wall of the fixing clip, which is fixedly connected to the outer wall of the power module.

[0008] Preferably, the bottom of the housing is provided with a through groove, and the inner wall of the through groove is fitted onto the outer wall of the rotating disk.

[0009] Beneficial effects This invention provides a pinhole imaging teaching aid. It offers the following advantages: Through the cooperation of a sealing plate, limiting groove, rotating aperture plate, light-transmitting hole, limiting block, and connecting post, this pinhole imaging teaching aid allows for the replacement of different shaped pinholes according to teaching needs. This effectively overcomes the limitation of traditional teaching aids that can only provide a single circular pinhole, enabling students to personally verify the core principle of pinhole imaging, thus avoiding one-sided understanding. Furthermore, each time the light-transmitting hole is switched, it can be precisely aligned with the optical axis without repeated adjustments, saving classroom teaching time and avoiding experimental errors caused by pinhole misalignment, thereby improving teaching efficiency. At the same time, the diverse shapes of the light-transmitting holes can fully stimulate students' curiosity and significantly increase their participation.

[0010] By coordinating the adjusting column, adjusting ring, power module, and mounting base, the position of the pattern board can be moved to meet various changes in object distance during teaching, thereby improving the exploratory function and teaching adaptability of the teaching aid. This allows students to skillfully apply the "control variable method" during operation, laying a solid foundation for their thinking in subsequent learning of other physics experiments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the appearance of the present utility model; Figure 2 for Figure 1 A sectional view; Figure 3 for Figure 1 Exploded view in the image; Figure 4 for Figure 3 A schematic diagram of the structure of the middle adjustment seat, pattern plate and adjustment column.

[0012] In the diagram: 1. Housing; 2. Observation seat; 3. Light screen; 4. Adjustment seat; 5. Pattern plate; 6. Sealing plate; 7. Limiting groove; 8. Rotating plate; 9. Light-transmitting hole; 10. Limiting block; 11. Connecting column; 12. Adjusting column; 13. Adjusting ring; 14. Power module; 15. Mounting seat; 16. Slide groove; 17. Sliding block; 18. Fixing clip; 19. Fixing groove; 20. Through groove. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] In actual teaching, traditional pinhole imaging teaching aids are mostly equipped with only a single-sized circular pinhole in their structural design, and the pinhole components are mostly fixed and non-replaceable. Although they can meet basic teaching needs, they have significant functional limitations in actual teaching scenarios. On the one hand, they cannot verify the core principle that "the shape of the pinhole does not affect the shape of the image," which may lead to a one-sided understanding among students. On the other hand, the traditional plug-in card design is very time-consuming when changing the pinhole, and it is difficult to ensure that the new pinhole is precisely aligned with the optical axis during the plugging and unplugging process, which may cause problems such as offset and blurring, thus interfering with the experimental results.

[0015] In view of this, the present invention provides a pinhole imaging teaching aid. This pinhole imaging teaching aid, through the cooperation of a sealing plate, a limiting groove, a rotating hole plate, a light-transmitting hole, a limiting block, and a connecting column, enables the replacement of different shaped pinholes according to teaching needs. This effectively solves the limitation of traditional teaching aids that can only provide a single circular pinhole, allowing students to verify the core principle of pinhole imaging by hand, thereby avoiding one-sided cognition. Moreover, each time the light-transmitting hole is switched, it can be accurately aligned with the optical axis without repeated adjustments, saving classroom teaching time and avoiding experimental errors caused by pinhole misalignment, thus improving teaching efficiency. At the same time, the diverse shapes of the light-transmitting holes can fully stimulate students' curiosity and significantly improve their participation.

[0016] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0017] Example 1, by Figure 1-4 It is known that a pinhole imaging teaching aid includes a housing 1, an observation seat 2 fixedly connected to the inner wall of the housing 1, a screen 3 fixedly connected to the outer wall of the observation seat 2 near the inner wall of the housing 1, the outer wall of the screen 3 adhering to the inner wall of the housing 1, and an adjustment seat 4 fixedly connected to the inner wall of the housing 1 away from the screen 3. A pattern plate 5 is provided inside the adjustment seat 4, and a pinhole changing mechanism is provided between the pattern plate 5 and the screen 3. The pinhole changing mechanism includes a sealing plate 6, a limiting groove 7, a rotating hole plate 8, a light-transmitting hole 9, a limiting block 10, and a connecting post 11. The sealing plate 6 is provided with... A sealing plate 6 is fixedly connected to the inner wall of the housing 1 and placed between the light screen 3 and the pattern plate 5. A limiting groove 7 is opened on the outer wall of the sealing plate 6 near the light screen 3. A rotating hole plate 8 is provided between the sealing plate 6 and the light screen 3. A light-transmitting hole 9 is opened on the outer wall of the rotating hole plate 8. A limiting block 10 is fixedly connected to the outer wall of the rotating hole plate 8 near the sealing plate 6. The limiting block 10 is inserted into the inner wall of the limiting groove 7. A connecting column 11 is rotatably connected to the inner wall of the rotating hole plate 8 through a sealing bearing. The connecting column 11 is fixedly connected between the inner wall of the housing 1 and the sealing plate 6. In the specific implementation process, it is worth noting that the shell 1 is composed of two identical parts, both resembling a combination of a quadrangular prism and a cylinder. The overall cross-section of shell 1 is similar to a cross, with internal threads machined on both sides of its inner wall. One half of the shell 1 has a square annular cross-section resembling an L-shaped groove on its outer wall, while the other half has a square annular cross-section resembling an L-shaped protrusion on its outer wall. The two parts can be interlocked and fixed together. The shell 1 can be made of ABS engineering plastic. The observation base 2 is generally similar to a cylinder, with external threads machined on its outer wall and a circular through-hole machined in its center. The user can observe the screen 3 inside the shell 1 through the through-hole. The screen 3 is... The body is circular, employing a double-layer composite structure. The base layer is a white PET plastic sheet with a matte finish, while the outer layer is a peelable, semi-transparent tracing paper, which is electrostatically attached to the PET sheet surface and can be quickly peeled off for transmission observation, adapting to various teaching scenarios. The adjustment seat 4 is tubular in shape and can be made of ABS engineering plastic. Its outer wall is also machined with external threads, and its side walls have threaded holes. The pattern plate 5 is square in shape and can be made of transparent plastic. The patterned parts are completely transparent, while the rest are frosted to be semi-transparent. The sealing plate 6 is square in shape and can be made of black ABS plastic. It has a circular through-hole in the center and multiple limiting grooves at the bottom. The limiting groove 7 is generally similar to a cylindrical groove, and the rotating hole plate 8 is generally similar to a circular plate. Its material can be black PC plastic. A large circular through-hole is machined in its center for connecting the sealing bearing. Multiple light-transmitting holes 9 are arranged around this circular through-hole. The light-transmitting holes 9 include two circles of different diameters, one triangle, and one quadrilateral. The specific shape and number of the light-transmitting holes 9 are not limited, as long as they meet the operational requirements. Multiple limiting blocks 10 are machined, and their number can be set according to the number of limiting grooves 7, as long as they meet the operational requirements. Their material is TPR elastic plastic. The connecting column 11 supports and fixes the rotating hole plate 8. Its material can be black ABS plastic. In actual teaching, when it is necessary to change the light-transmitting holes required for imaging... At 9 o'clock, the user holds the outer shell of the housing 1 with one hand and supports the rotating aperture plate 8 with the other hand. Using the observation direction as a reference, the user pushes the rotating aperture plate 8 along the direction. The rotating aperture plate 8 drives the light-transmitting hole 9 to rotate, and at the same time drives the limiting block 10 to rotate. Under the action of force, the limiting block 10 leaves the initial limiting groove 7 and follows the rotating aperture plate 8 to rotate until it enters the next limiting groove 7. At this time, the user will hear a 'click' sound, that is, the rotating aperture plate 8 rotates one position. At this time, the shape of the light-transmitting hole 9 located in front of the central through hole of the sealing plate 6 changes. The user can observe the situation inside the housing 1 through the observation hole on the observation seat 2, thereby achieving the purpose of control experiment and improving the adjustment accuracy and adjustment efficiency of the pinhole imaging teaching tool. Furthermore, the adjustment seat 4 is provided with an adjustment mechanism inside; the adjustment mechanism includes an adjustment column 12, an adjustment ring 13, a power module 14 and a mounting seat 15; the outer wall of the adjustment column 12 is threadedly connected to the inner wall of the adjustment seat 4, the inner wall of the adjustment seat 4 is fitted with the adjustment ring 13, the inner wall of the adjustment ring 13 is rotatably connected to the outer wall of the adjustment column 12 through a sealed bearing, the side of the outer wall of the adjustment ring 13 away from the adjustment column 12 is fixedly connected to the power module 14, the outer wall of the power module 14 is fitted with the inner wall of the adjustment seat 4, the side of the outer wall of the power module 14 away from the adjustment ring 13 is fitted with the mounting seat 15, and the mounting seat 15 is sleeved on the outer wall of the pattern plate 5; In the specific implementation process, it is worth noting that the cross-section of the adjusting column 12 is similar to a 'T' shape, and the whole is similar to a cylinder. Its outer wall is machined with external threads, and its end outer wall is machined with anti-slip texture. Its material can be PA66 nylon. The adjusting ring 13 is ring-shaped and its material can be ABS plastic. Its inner wall is equipped with a sealed bearing, which is rotatably connected to the adjusting column 12. The power module 14 consists of a battery holder (BH-CR2032-W model), a button battery (lithium manganese button battery CR2032 model), and an LED bulb (SMD-0805-W model), which provides a stable light source for the pinhole imaging teaching aid. The side of its outer wall closest to the pattern plate 5 is the output port, and the LED bulb is installed in the port. The mounting base 15 is shaped like a cross, with a groove in the center to fix the pattern plate 5. The front and rear sides of the pattern plate 5 are aligned with the LED bulb and the central through hole of the sealing plate 6, respectively. In actual teaching, when the position of the pattern plate 5 needs to be adjusted, the user holds the outer wall of the housing 1 with one hand and the adjusting column 12 with the other, and rotates the adjusting column 12 clockwise. The adjusting column 12 drives the adjusting ring 13 to move through the sealed bearing. The adjusting ring 13 drives the power module 14 to move. The power module 14 drives the mounting base 15 to move. The mounting base 15 drives the pattern plate 5 to move. The pattern plate 5 gradually moves closer to the sealing plate 6. After reaching the designated position, the rotation of the adjusting column 12 is stopped, and the object distance adjustment is completed. This improves the teaching adaptability of the pinhole imaging teaching aid. Furthermore, the inner wall of the adjustment seat 4 is provided with a sliding groove 16, and a slider 17 is slidably connected to the inner wall of the sliding groove 16. The slider 17 is fixedly connected to the outer wall of the power module 14. In the specific implementation process, it is worth noting that there are two slides 16, which are symmetrically arranged and have a cross-section similar to a square. There are two sliders 17, which are generally similar to rectangular rods. The material of the sliders 16 can be ABS plastic. When the power module 14 moves, the cooperation of the slides 16 and sliders 17 limits the power module 14 and ensures that the output port of the power module 14 is aligned with the pattern plate 5, thereby improving the imaging stability of the pinhole imaging teaching aid. Example 2, by Figure 1-4It can be seen that a fixing clip 18 is fixedly connected to the outer wall of the mounting base 15 near the power module 14, and a fixing groove 19 is snapped into the outer wall of the fixing clip 18, which is fixedly connected to the outer wall of the power module 14. In the specific implementation process, it is worth noting that the cross-section of the fixing card 18 is similar to the shape of the number '7', and there are two of them, which are symmetrically arranged. The material of the fixing card 18 can be TPR elastic plastic. There are two fixing slots 19, which are located on both sides of the outer wall of the output port of the power module 14. The fixing slot 19 is similar to a quadrangular prism, and the material of the fixing slot 19 can be engineering plastic. The inner wall of the fixing slot 19 has a groove similar to the number '7'. In actual installation, after the user inserts the pattern plate 5 into the inner wall of the mounting base 15, he aligns the two fixing cards 18 on the mounting base 15 with the two fixing slots 19 on the outer wall of the power module 14, and moves the fixing cards 18 closer to the fixing slots 19 until the fixing cards 18 are fully engaged with the inner wall of the fixing slots 19. At this time, the mounting base 15 is fixed in front of the power module 14, which improves the structural stability and installation convenience of the pinhole imaging teaching aid. Furthermore, a through groove 20 is provided at the bottom of the housing 1, and the inner wall of the through groove 20 is fitted onto the outer wall of the rotating disk 8. In the specific implementation process, it is worth noting that the through groove 20 is opened at the bottom of the housing 1, and each half of the housing 1 is opened in two parts. The whole is similar to a rectangular through hole, and a sealing gasket is fixedly connected to its inner wall. The sealing gasket is also composed of two parts. The material of the sealing gasket can be rubber. The sealing gasket increases the friction for the rotation of the rotating hole plate 8, making it easier for the user to rotate. In addition, the sealing gasket can also fill the gap between the rotating hole plate 8 and the through groove 20, preventing interference light from entering the interior of the housing 1, thereby improving the imaging effect of the pinhole imaging teaching aid. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pinhole imaging teaching aid, comprising a housing (1), characterized in that: An observation seat (2) is fixedly connected to the inner wall of the housing (1). A light screen (3) is fixedly connected to the outer wall of the observation seat (2) on the side close to the inner wall of the housing (1). The outer wall of the light screen (3) is attached to the inner wall of the housing (1). An adjustment seat (4) is fixedly connected to the inner wall of the housing (1) on the side away from the light screen (3). A pattern plate (5) is provided inside the adjustment seat (4). A hole-changing mechanism is provided between the pattern plate (5) and the light screen (3). The hole-changing mechanism includes a sealing plate (6), a limiting groove (7), a rotating hole plate (8), a light-transmitting hole (9), a limiting block (10), and a connecting column (11). The sealing plate (6) is disposed between the light screen (3) and the pattern plate (5). The sealing plate (6) is fixedly connected to the inner wall of the housing (1). A limiting groove (7) is opened on the outer wall of the sealing plate (6) near the light screen (3). A rotating hole disk (8) is disposed between the sealing plate (6) and the light screen (3). A light-transmitting hole (9) is opened on the outer wall of the rotating hole disk (8). A limiting block (10) is fixedly connected on the outer wall of the rotating hole disk (8) near the sealing plate (6). The limiting block (10) is inserted into the inner wall of the limiting groove (7). A connecting column (11) is rotatably connected to the inner wall of the rotating hole disk (8) through a sealing bearing. The connecting column (11) is fixedly connected between the inner wall of the housing (1) and the sealing plate (6).

2. The pinhole imaging teaching aid according to claim 1, characterized in that: The adjusting seat (4) is provided with an adjusting mechanism inside; The adjustment mechanism includes an adjustment column (12), an adjustment ring (13), a power module (14), and a mounting base (15); The outer wall of the adjusting column (12) is threaded to the inner wall of the adjusting seat (4). The inner wall of the adjusting seat (4) is fitted with an adjusting ring (13). The inner wall of the adjusting ring (13) is rotatably connected to the outer wall of the adjusting column (12) through a sealed bearing. A power module (14) is fixedly connected to the side of the outer wall of the adjusting ring (13) away from the adjusting column (12). The outer wall of the power module (14) is fitted to the inner wall of the adjusting seat (4). A mounting seat (15) is fitted to the side of the outer wall of the power module (14) away from the adjusting ring (13). The mounting seat (15) is sleeved on the outer wall of the pattern plate (5).

3. The pinhole imaging teaching aid according to claim 2, characterized in that: The inner wall of the adjustment seat (4) is provided with a sliding groove (16), and a slider (17) is slidably connected to the inner wall of the sliding groove (16). The slider (17) is fixedly connected to the outer wall of the power module (14).

4. The pinhole imaging teaching aid according to claim 2, characterized in that: A fixing clip (18) is fixedly connected to the outer wall of the mounting base (15) near the power module (14). The outer wall of the fixing clip (18) is fitted with a fixing groove (19), which is fixedly connected to the outer wall of the power module (14).

5. The pinhole imaging teaching aid according to claim 1, characterized in that: The bottom of the housing (1) is provided with a through groove (20), and the inner wall of the through groove (20) is fitted onto the outer wall of the rotating hole disk (8).

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