Demonstration device for narrowest plane mirror on wall

Abstract

The invention designs a demonstration device for geometric parameter selection of a narrowest wall plane mirror in a shoulder width visible range, and belongs to the crossing field of architectural optics and ergonomics. The demonstration device based on geometric optical model calculation is designed for solving the problems of low space utilization rate and function conflict of space-limited scenes (elevator cars and medical isolation areas) caused by the fact that traditional mirror width design depends on empirical formulas. The device is composed of a plane mirror, a mirror surface supporting table with scales, a left mirror surface limiting plate, a right mirror surface limiting plate, an objective lens distance control square rod, a shoulder width boundary rod, an adjustable eye distance observation disc and the like. A control variable method can be adopted to execute three groups of experiments, namely single-eye independent observation (experiment a), double-eye complementary compensation observation (experiment b) and double-eye common observation (experiment c), and a model with the narrowest mirror width under the three conditions is effectively verified. The device has the beneficial effects of breaking through empirical formula cognition limitation, converting an optical principle into a demonstration device, providing a standardized demonstration process, and realizing dynamic demonstration and parameter calculation of the minimum width of the plane mirror.

Description

Technical Field

[0001] The present invention belongs to the intersection of architectural optics and ergonomics, and specifically relates to a demonstration device that determines the narrowest width parameter of a shoulder-width visual range that can be clearly observed by a wall plane mirror through geometric optical model calculation and visualization experimental verification. Background Art

[0002] In the field of architectural optical design, the width of wall mirrors is commonly determined by industry empirical values ​​(typically 40-50cm). This reliance on empirical values ​​is further reinforced by the knowledge system within architectural education. Current textbooks only teach empirical formulas for height design (minimum mirror height = body height / 2), leading designers to apply similar proportional relationships to width design, resulting in a simplified principle that the narrowest mirror width is half shoulder width. While these empirical values ​​may meet basic functional requirements in conventional spaces (such as residential bathrooms and shopping mall fitting rooms), they fail to distinguish between the essential optical differences between height and width. Specifically, height design only needs to cover the vertical field of view of a single eye, while width design must address the geometric compatibility of binocular field of view overlap. When the observer looks at the shoulder, the mirror surface must simultaneously receive symmetrical reflected light paths from both eyes to eliminate blind spots. These empirical values ​​ignore the interplay between optical path symmetry and architectural ergonomics, resulting in mirrors occupying redundant wall space in conventional spaces and forcing functional integrity or safety regulations to be compromised in extremely restricted environments.

[0003] While existing technology systems (such as the foldable mirror solution described in patent CN202223476655.5) optimize mechanical storage structures, they fail to overcome the optical computational bottleneck of minimizing mirror width. In conventional space design, there's no scientific basis for a fixed minimum mirror width, which can lead to poor space utilization. In space-constrained scenarios, fixed mirror widths can lead to multiple conflicts. For example, mirrors at handwashing stations in medical isolation areas encroach on wall space required for disinfection equipment, corner mirrors in narrow corridors obscure emergency safety signs due to their excessive width, and mirrors in cabin changing rooms squeeze passageways. These conflicts highlight the systematic failure of empirical data in extreme spaces.

[0004] Technical systems that simplify mirror design into a static geometric problem ignore the dynamic optical interaction between human, mirror, and space. This cognitive limitation has long prevented mirror width design from being a reality within the framework of precise architectural technology. It urgently needs to be addressed through scientific computational models and experimental verification, demonstrating adaptability to dual scenarios. First, it aims to scientifically optimize conventional designs. By analyzing the binocular field of view superposition effect, it demonstrates that the minimum mirror width is determined by the symmetric boundaries of the optical path. This reveals the relationship between optical paths and architectural ergonomics, providing a basis for optimizing standard spatial layouts and avoiding excessive space occupation caused by empirical values. Second, it aims to achieve functional breakthroughs in extreme scenarios. In extremely constrained environments, conventional empirical values, ignoring optical compression mechanisms, result in an excessively high proportion of wall space occupied. The minimum mirror width model, through dynamic boundary calculation, achieves extreme compression of mirror dimensions while ensuring full shoulder observation. For example, in medical isolation areas, this compression frees up space for disinfection equipment, resolving equipment conflicts under infection control requirements.

[0005] This patent transforms the principle of optical path symmetry into a dynamically verifiable demonstration tool. Its parameterized process enables designers to directly observe the quantitative relationship between the binocular field of view superposition effect and the minimum lens width, breaking the empirical cognitive misunderstanding that "the lens width is half the shoulder width." Summary of the Invention

[0006] This patent proposes a method for selecting and demonstrating the geometric parameters of the narrowest plane mirror width that allows shoulder width to be seen. Using a controlled variable method, the method utilizes a device consisting of a plane mirror, a left mirror limiting plate, a right mirror limiting plate, a left eye position observation plate, and a right eye position observation plate to achieve the narrowest plane mirror width required to allow shoulder width to be seen.

[0007] This patented technical solution follows the principles of geometric optics and demonstrates the selection and demonstration of the narrowest plane mirror width parameter by adjusting a simple manual device. The specific process includes device design, experimental operation, and principle analysis.

[0008] The device mainly consists of a rectangular plane mirror, a left mirror limiting plate, a right mirror limiting plate, two rectangular support platforms (with coordinate scale lines), an objective lens distance control square rod (with coordinate scale lines), a rectangular transparent organic glass plate, a shoulder-width left boundary rod, a shoulder-width right boundary rod, a left eye position observation disk, a right eye position observation disk, a T-shaped vertical magnetic strip adsorption straight rod (with coordinate scale lines), and four T-shaped vertical magnetic strip components. In order to facilitate operation, a drive control replacement device for adjusting the distance between the left and right eye position observation disks is added, which mainly includes: a left eye control sliding rack, a right eye control sliding rack, a sliding rack guide tube, a drive gear, a hand-cranked drive handle, a left eye position observation disk, a right eye position observation disk, a control panel a for the left eye position observation disk, a control panel b for the right eye position observation disk, and a drive control replacement device fixing plate (such as the attached Figure 3 ).

[0009] The invention is characterized in that the rectangular plane mirror is a coated plane mirror; the left and right mirror limiting plates are dark rectangular opaque baffles of the same size and rough surface, the upper end of the mirror limiting plate is hook-shaped and the lower end is smooth, which is convenient for it to overlap with the rectangular plane mirror and can slide and position in the slide groove of the rectangular support platform; the table top of the rectangular support platform is horizontal, with a slide groove on the surface and engraved with coordinate scale lines, and a square through hole matching the objective lens distance control square rod is left in the middle of the rectangular support platform; the surface of the objective lens distance control square rod is engraved with coordinate scale lines; the left and right side boundary rods of shoulder width are straight rods, and the top can be fixed on a T-shaped vertical magnetic strip to ensure that the vertical direction of the T-shaped vertical magnetic strip coincides with the center line direction of the left and right side boundary rods of shoulder width; the left and right eye position observation disks are transparent disks of the same size, and there is a cross positioning identification symbol at the center of the circle, and the top of the left and right eye position observation disks can be fixed on the T-shaped vertical magnetic strip to ensure that the vertical direction of the T-shaped magnetic strip passes through the center of the left and right eye position observation disks; The T-shaped vertical magnetic strip adsorption straight rod is a ferromagnetic material used to adsorb the T-shaped vertical magnetic strip. It has coordinate scale lines on its surface and is used in combination with a rectangular support platform to determine the pupil distance and shoulder width. The supplementary drive control replacement device for adjusting the distance between the left and right eye position observation disks is characterized in that the drive control replacement device fixing plate is attached to a rectangular transparent organic glass plate and is fixed vertically in the center on the horizontal rectangular support platform; the tube wall of the sliding rack guide tube with a smooth inner surface is attached to the drive control replacement device fixing plate, and the central axis (busbar) direction of the identical four sliding rack guide tubes are all horizontally parallel, and the bearing of the drive gear is fixed vertically on the drive control replacement device fixing plate; the left and right eye position observation disks are fixed to the left and right eye position observation disks respectively by straight rods whose extension lines pass through the center of the circle. The control panels a and b of the disk are respectively connected to the left and right eye control sliding racks, which are horizontally parallel and located in the same vertical plane. The left and right eye control sliding racks pass through the sliding rack guide tubes, and the outer surfaces of the left and right eye control sliding racks match the inner diameters of the sliding rack guide tubes. The drive gears match the left and right eye control sliding racks. The left and right eye control sliding racks drive the left and right eye position observation disks. The drive gears are controlled to rotate by a hand-cranked drive handle. When the drive gears are rotated counterclockwise, the distance between the control panels a and b of the left and right eye position observation disks increases; otherwise, the distance decreases.

[0010] The component is composed of two parts, the observation end and the observed end, which are vertically connected in the middle by the objective lens distance control square rod. To prevent the objective lens distance control square rod from falling off during use, there are through holes at both ends of the objective lens distance control square rod for passing anti-falling pins. Manual external force can change the distance between the observation end and the observed end. The observation end is fixed vertically and centered on the horizontal rectangular support platform by a rectangular transparent organic glass plate, and the T-shaped vertical magnetic strip adsorption straight rod is fixed in the center on the upper edge of the rectangular transparent organic glass plate; the left and right pupil position observation disks and the left and right side boundary rods of the shoulder width are respectively adsorbed on the T-shaped vertical magnetic strip adsorption straight rod by T-shaped vertical magnetic strips, and are close to the rectangular transparent organic glass plate, and are symmetrically distributed on both sides of the objective lens distance control square rod (their positions correspond to the attached Figure 1 (A, B, C, and D) The vertical extensions of the T-shaped vertical magnetic strips align with the center of the left and right eye observation disks and the center lines of the left and right shoulder-width boundary rods, respectively. The observed end is fixed vertically and centered on the horizontal rectangular support platform by a rectangular plane mirror, ensuring that it is parallel to the rectangular transparent plexiglass plate at the observation end. The objective lens spacing control rod is perpendicular to the vertically placed rectangular plane mirror and rectangular transparent plexiglass plate. The upper ends of the left and right mirror limit plates are hung on the rectangular plane mirror, and the lower ends are located in the slide slots on the rectangular support platform. A drive control replacement device for adjusting the spacing between the left and right eye observation disks can be added to the observation end.

[0011] During the demonstration, adjust the distance between the observation end and the observed end to a distance where the object can be seen clearly, ensuring that the distance between the two cuboid support platforms remains unchanged. Manually or with the help of the drive control replacement device that controls the distance between the left and right eye position observation disks, adjust the center position of the left and right eye position observation disks to the position of the observer's left and right pupils (see the attached figure). Figure 1 Similarly, adjust the position of the left and right boundary bars of the shoulder width on the rectangular transparent organic glass plate so that they coincide with the left and right boundaries of the observer's shoulder width (see Appendix). Figure 1 The distance between points C and D in the figure is the shoulder width of the human body. On this basis, the following three groups of experiments were carried out according to the characteristics of single and binocular observation.

[0012] Experiment a) Use one eye to look at the rectangular plane mirror and adjust the left and right mirror limit plates so that you can see the left and right boundary rod positions (corresponding to the attached Figure 1 The images of C and D in the middle (the image width edges correspond to the attached Figure 1 C1, D1); read and record the position coordinates of the inner sides of the left and right mirror limiting plates on the rectangular plane mirror (left eye observation corresponds to the attached Figure 1 A1 and A2 in the middle; the right eye corresponds to coordinates B1 and B2).

[0013] Experiment b) The left and right eyes simultaneously observe the rectangular plane mirror, and adjust the left and right mirror limit plates to ensure that the left eye can observe the right shoulder edge image, and the right eye can observe the left shoulder edge image. Through binocular compensation, the two eyes can just see the left and right boundary rod positions (corresponding to the attached Figure 1 The images of C and D in the figure (corresponding to the attached Figure 1 Read and record the position coordinates of the inner sides of the left and right mirror limiting plates on the rectangular plane mirror (corresponding to the attached Figure 1 B1 and A2 in the middle).

[0014] Experiment c) The left and right eyes simultaneously viewed the rectangular plane mirror, and adjusted the left and right mirror limit plates to ensure that each eye could independently view the left and right boundary rod positions at shoulder width (corresponding to the attached Figure 1 The image of C, D) (corresponding to the attached Figure 1 Read and record the position coordinates of the inner sides of the left and right mirror limiting plates on the rectangular plane mirror (corresponding to the attached Figure 1 A1 and B2); verify the measured data with theoretical deduction.

[0015] Principle analysis: as attached Figure 1 Middle, shoulder width is the distance between C and D , the eye width is (d is the measured interpupillary distance), according to the principle of geometric optics, the shoulder width (object) is equal to the image width of the shoulder width (The image points corresponding to the left and right endpoints C and D of the shoulder width are C1 and D1 respectively).

[0016] The light rays of images C1 and D1 seen by A's eye correspond to points A1 and A2 on the mirror respectively. That is, the distance between points A1 and A2 is equal to 1 / 2 of the distance between images C1 and D1. (In this case, the conclusion is based on one eye).

[0017] The light rays of images C1 and D1 seen by B's eye correspond to points B1 and B2 on the mirror respectively. That is, the distance between points B1 and B2 is equal to 1 / 2 of the distance between images C1 and D1. , , .

[0018] The theoretical basis for selecting the geometric parameters for processing the width of a plane mirror under different conditions (geometric parameter formula) is discussed.

[0019] (1) When observing with one eye, the narrowest lens width required is the distance from point A1 to point A2 (left eye observation), or the distance from point B1 to point B2 (right eye observation), which is half the shoulder width. .

[0020] (2) When observing with both eyes, ensure that the left eye can observe the image of the right shoulder edge, and the right eye can observe the image of the left shoulder edge. Through binocular complementary compensation, the width of the mirror is the distance from point B1 to point A2, set as d1, and because + , that is, the narrowest mirror width is half the difference between the shoulder width and the distance between the pupils of the two eyes, that is, .

[0021] (3) When observing with both eyes, to ensure that each eye can see the image of the entire shoulder width independently, the narrowest mirror width required is the distance from point A1 to point B2, which is half the sum of the shoulder width and the interpupillary distance between the two eyes (d is the measured interpupillary distance between the two eyes). .

[0022] In short, if one eye views a full shoulder-width image, the narrowest plane mirror width is half the shoulder width. If binocular complementarity is considered, the width of the narrowest plane mirror should not be less than If both eyes need to be able to observe clearly independently, the width of the narrowest plane mirror is .

[0023] The beneficial effects of the present invention are as follows: (1) In theory, based on the binocular field superposition principle, a geometric parameter selection model for the narrowest lens width under three conditions is established ( 、 and ); (2) In terms of methods, it provides reproducible parameter calculation and demonstration processes, uses simple devices and standardized operations to transform optical principles into intuitive interactive deduction processes, and provides a meaningful demonstration method for teaching and scientific research of related content; (3) In terms of resources, the narrowest mirror width design significantly reduces material redundancy and improves space utilization efficiency (especially in extreme scenarios such as elevator cabins and medical isolation areas); (4) In terms of teaching, it uses low-cost and quantifiable experimental tools to promote the transformation of architectural optical education from experience-based teaching to scientific verification; (5) In terms of industry, it balances the contradiction between functional integrity and spatial constraints and provides a new paradigm for mirror design for green buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 This is a schematic diagram of the principle behind this patent. A and B are the pupil positions of the left and right eyes, respectively. C and D are the left and right boundary points of shoulder width, respectively. C1 and D1 are the image points of the corresponding left and right boundary points C and D in the plane mirror. A1 and A2 are the locations where the optical path intersects the plane mirror when the left eye A views image points C1 and D1. Similarly, B1 and B2 are the locations where the optical path intersects the plane mirror when the right eye B views image points C1 and D1.

[0025] Attachment Figure 2This is a schematic diagram of the overall device structure adjusted by the T-shaped vertical magnetic strip in this patent. It specifically includes: 1. Rectangular plane mirror (with coordinate scale lines), 2-1. Left mirror limit plate, 2-2. Right mirror limit plate, 3. Rectangular support platform (with coordinate scale lines), 4. Objective lens distance control square rod (with coordinate scale lines), 5. Rectangular transparent plexiglass plate, 6-1. Shoulder-width left boundary rod, 6-2. Shoulder-width right boundary rod, 7-1. Left eye position observation disk, 7-2. Right eye position observation disk, 8. T-shaped vertical magnetic strip adsorption straight rod (with coordinate scale lines), 9. T-shaped vertical magnetic strip.

[0026] Attachment Figure 3 This is a schematic diagram of the overall device structure adjusted by the drive control replacement device in this patent. Specifically, it includes: 1. Rectangular plane mirror (with coordinate scale lines), 2-1. Left mirror limit plate, 2-2. Right mirror limit plate, 3. Rectangular support platform (with coordinate scale lines), 4. Objective lens distance control square rod (with coordinate scale lines), 5. Rectangular transparent plexiglass plate, 5-1. Drive control replacement device fixing plate, 6-1. Shoulder-width left boundary rod, 6-2. Shoulder-width right boundary rod, 7-1. Left eye position observation disk, 7-2. Right eye position observation disk, 8. T-shaped vertical magnetic strip attraction rod (with coordinate scale lines), 9. T-shaped vertical magnetic strip, 10-1. Left eye control sliding rack, 10-2. Right eye control sliding rack, 11. Sliding rack guide tube, 12. Drive gear, 13. Hand crank drive handle; 14-1. Control panel a for the left eye position observation disk, 14-2. Control panel b for the right eye position observation disk.

[0027] Attachment Figure 3-1 Schematic diagram of the drive control replacement device for adjusting the distance between the left and right eye position viewing discs. Specifically, it includes: 5-1. Drive control replacement device fixing plate, 7-1. Left eye position viewing disc, 7-2. Right eye position viewing disc, 10-1. Left eye control sliding rack, 10-2. Right eye control sliding rack, 11. Sliding rack guide tube, 12. Drive gear, 13. Hand crank handle; 14-1. Left eye position viewing disc control panel A, 14-2. Right eye position viewing disc control panel B. DETAILED DESCRIPTION

[0028] As attached Figure 2As shown, the device mainly consists of a rectangular plane mirror 1, a left mirror limiting plate 2-1, a right mirror limiting plate 2-1, two rectangular support platforms (with coordinate scale lines) 3, an objective lens distance control square rod (with coordinate scale lines) 4, a rectangular transparent organic glass plate 5, a shoulder-width left boundary rod 6-1, a shoulder-width right boundary rod 6-2, a left eye position observation disk 7-1, a right eye position observation disk 7-2, a T-shaped vertical magnetic strip adsorption straight rod (with coordinate scale lines) 8, and four T-shaped vertical magnetic strips 9. For ease of operation, a drive control replacement device for adjusting the distance between the left and right eye position observation disks is added, as shown in the attached figure. Figure 3 As shown, it mainly includes: a left-eye control sliding rack 10-1, a right-eye control sliding rack 10-2, a sliding rack guide tube 11, a driving gear 12, a hand-cranked driving handle 13, a left-eye position observation disk 7-1, a right-eye position observation disk 7-2, a control panel a 14-1 of the left-eye position observation disk, a control panel b 14-2 of the right-eye position observation disk, and a driving control replacement device fixing plate 5-1.

[0029] As attached Figure 2 As shown, it is characterized in that the rectangular plane mirror 1 is a coated plane mirror; the left and right mirror limiting plates 2-1 and 2-2 are dark rectangular opaque baffles of the same size and rough surface, the upper end of the mirror limiting plate is hook-shaped and the lower end is smooth, which is convenient for it to overlap with the rectangular plane mirror 1 and can slide and position in the slide groove of the rectangular support platform 3; the rectangular support platform 3 has a horizontal surface, a slide groove on the surface, and is engraved with coordinate scale lines, and a square through hole matching the objective lens distance control rod 4 is left in the middle of the rectangular support platform; the surface of the objective lens distance control rod 4 is engraved with Coordinate scale lines; the left and right boundary rods 6-1 and 6-2 of shoulder width are both straight rods, and the top can be fixed on the T-shaped vertical magnetic strip 9 to ensure that the vertical direction of the T-shaped vertical magnetic strip 9 coincides with the center line direction of the left and right boundary rods 6-1 and 6-2 of shoulder width; the left and right eye position observation disks 7-1 and 7-2 are transparent disks of the same size, and there is a cross positioning identification symbol at the center of the circle. The top ends of the left and right eye position observation disks 7-1 and 7-2 can be fixed on the T-shaped vertical magnetic strip 9 to ensure that the T-shaped magnetic strip 9 passes through the center of the left and right eye position observation disks in the vertical direction; the T-shaped vertical magnetic strip adsorption straight rod 8 is a ferromagnetic material, used to adsorb the T-shaped vertical magnetic strip 9, with coordinate scale lines on the surface, and is combined with the rectangular support platform 3 to determine the pupil distance and shoulder width size.

[0030] As attached Figure 3As shown, the supplementary drive control replacement device for adjusting the distance between the left and right eye position observation disks is characterized in that the drive control replacement device fixing plate 5-1 is attached to the rectangular transparent organic glass plate 5 and is fixed vertically in the center on the horizontal rectangular support platform 3; the tube wall of the sliding rack guide tube 11 with a smooth inner surface is attached to the drive control replacement device fixing plate 5-1, the central axis (busbar) direction of the same four sliding rack guide tubes 11 is horizontally parallel, and the bearing of the driving gear 12 is fixed vertically on the drive control replacement device fixing plate 5-1; the left and right eye position observation disks 7-1 and 7-2 are respectively fixed to the control board a 14-1 and control board b of the left and right eye position observation disks by straight rods whose extension lines pass through the center of the circle. 14-2, respectively connected to the left and right eye control sliding racks 10-1 and 10-2 which are horizontally parallel and located in the same vertical plane; the left and right eye control sliding racks 10-1 and 10-2 pass through the sliding rack guide tube 11, and the outer surfaces of the left and right eye control sliding racks 10-1 and 10-2 match the inner diameter of the sliding rack guide tube 11; the driving gear 12 matches the left and right eye control sliding racks 10-1 and 10-2; the left and right eye control sliding racks 10-1 and 10-2 drive the left and right eye position observation disks 7-1 and 7-2; the driving gear 12 is controlled to rotate by the hand-cranked driving handle 13. When it rotates counterclockwise, the distance between the control panel a 14-1 and the control panel b 14-2 of the left and right eye position observation disks increases; otherwise, the distance decreases.

[0031] The component is composed of an observation end and an observed end, which are vertically connected in the middle by an objective lens distance control square rod 4. To prevent the objective lens distance control square rod 4 from falling off during use, through holes are provided at both ends of the objective lens distance control square rod 4 for passing anti-falling pins. Manual external force can change the distance between the observation end and the observed end. The observation end is fixed vertically and centered on the horizontal rectangular support platform 3 by a rectangular transparent organic glass plate 5. The T-shaped vertical magnetic strip 9 is fixed to the center of the upper edge of the rectangular transparent organic glass plate 5 by an adsorption straight rod; the left and right pupil position observation disks 7-1 and 7-2 and the left and right shoulder width boundary rods 6-1 and 6-2 are respectively adsorbed on the T-shaped vertical magnetic strip adsorption straight rod 8 by the T-shaped vertical magnetic strip 9, and are tightly attached to the rectangular transparent organic glass plate 5, and symmetrically distributed on both sides of the objective lens distance control square rod 4 (their positions correspond to the attached Figure 1 A, B, C, D), the vertical extension lines of the T-shaped vertical magnetic strips 9 are aligned with the centers of the left and right eye observation disks 7-1, 7-2 and the center lines of the left and right boundary rods 6-1, 6-2 of the shoulder width respectively; the observed end is vertically centered on the horizontal rectangular support platform 3 by the rectangular plane mirror 1, and ensured to be parallel to the rectangular transparent organic glass plate 5 of the observation end, the objective lens spacing control square rod 4 is perpendicular to the vertically placed rectangular plane mirror 1 and the rectangular transparent organic glass plate 5; the upper ends of the left and right mirror limiting plates 2-1, 2-2 are hung on the rectangular plane mirror 1, and the lower ends are located in the slide groove on the rectangular support platform 3.

[0032] A drive control replacement device for adjusting the distance between the left and right eye position observation disks 7-1 and 7-2 can be additionally placed at the observation end.

[0033] During demonstration, adjust the distance between the observation end and the observed end to a distance where the object can be seen clearly, ensuring that the distance between the rectangular support platforms 3 at both ends remains unchanged. Manually or with the help of the drive control replacement device that controls the distance between the left and right eye position observation disks, adjust the center positions of the left and right eye position observation disks 7-1 and 7-2 to the positions of the observer's left and right pupils (see attached). Figure 1 Similarly, adjust the positions of the left and right boundary rods 6-1 and 6-2 of the shoulder width on the rectangular transparent organic glass plate 5 so that they coincide with the left and right boundaries of the observer's shoulder width (see Appendix). Figure 1 The distance between points C and D in the figure is the shoulder width of the human body. On this basis, the following three groups of experiments were carried out according to the characteristics of single and binocular observation.

[0034] Experiment a) Use one eye to look at the rectangular plane mirror 1 and adjust the left and right mirror limiting plates 2-1 and 2-2 so that the left and right boundary rods 6-1 and 6-2 at shoulder width can be seen (corresponding to the attached Figure 1 The images of C and D in the middle (the image width edges correspond to the attached Figure 1 C1, D1); read and record the position coordinates of the inner sides of the left and right mirror limiting plates on the rectangular plane mirror (left eye observation corresponds to the attached Figure 1 A1 and A2 in the middle; the right eye corresponds to coordinates B1 and B2).

[0035] Experiment b) The left and right eyes simultaneously observe the rectangular plane mirror 1, and adjust the left and right mirror limit plates 2-1 and 2-2 to ensure that the left eye can observe the image of the right shoulder edge, and the right eye can observe the image of the left shoulder edge. Through binocular compensation, both eyes can just see the full shoulder width of the left and right boundary rods 6-1 and 6-2 (corresponding to the attached Figure 1 The images of C and D in the figure (corresponding to the attached Figure 1 C1, D1), read and record the position coordinates of the inner sides of the left mirror limiting plate 2-1 and the right mirror limiting plate 2-2 on the rectangular plane mirror 1 (corresponding to the attached Figure 1 B1 and A2 in the middle).

[0036] Experiment c) The left and right eyes simultaneously watch the rectangular plane mirror 1, and adjust the left and right mirror limit plates 2-1 and 2-2 to ensure that each eye can independently watch the left and right boundary rods 6-1 and 6-2 at shoulder width (corresponding to the attached Figure 1 The image of C, D) (corresponding to the attached Figure 1 Read and record the position coordinates of the inner sides of the left and right mirror limiting plates on the rectangular plane mirror 1 (corresponding to the attached Figure 1 A1 and B2); verify the measured data with theoretical deduction.

Claims

1. A geometric parameter demonstration device for the narrowest plane mirror on a wall, the device mainly comprises a rectangular plane mirror (1), a left mirror limiting plate (2-1), a right mirror limiting plate (2-1), two rectangular support platforms with coordinate scales (3), an objective lens distance control square rod with coordinate scales (4), a rectangular transparent organic glass plate (5), a shoulder width left boundary rod (6-1), a shoulder width right boundary rod (6-2), a left eye position observation plate (7-1), a right eye position observation plate (7-2), a T-shaped vertical magnetic strip adsorption straight rod with coordinate scales (8), The invention is composed of four T-shaped vertical magnetic strips (9); for the convenience of operation, a drive control replacement device for adjusting the distance between the left and right eye position observation disks is added, which mainly includes: a left eye control sliding rack (10-1), a right eye control sliding rack (10-2), a sliding rack guide tube (11), a drive gear (12), a hand-cranked drive handle (13), a left eye position observation disk (7-1), a right eye position observation disk (7-2), a control panel a (14-1) for the left eye position observation disk, a control panel b (14-2) for the right eye position observation disk, and a drive control replacement device fixing plate (5-1); Its characteristics are The rectangular plane mirror (1) is a coated plane mirror; the left and right mirror limiting plates (2-1) and (2-2) are dark rectangular opaque baffles of the same size and rough surface, the upper end of the mirror limiting plate is hook-shaped and the lower end is smooth, so that it is easy to overlap with the rectangular plane mirror (1) and can slide and position in the slide groove of the rectangular support platform (3); the rectangular support platform (3) has a horizontal table top, a slide groove on the surface, and is engraved with coordinate scale lines, and a square through hole matching the objective lens distance control square rod (4) is left in the middle of the rectangular support platform; the surface of the objective lens distance control square rod (4) is engraved with coordinate scale lines; the left and right sides of the shoulder width are The boundary rods (6-1) and (6-2) are straight rods, and the upper part can be fixed on the T-shaped vertical magnetic strip (9) to ensure that the vertical direction of the T-shaped vertical magnetic strip (9) coincides with the center line direction of the left and right boundary rods (6-1) and (6-2) of the shoulder width; the left and right eye position observation disks (7-1) and (7-2) are transparent disks of the same size, and the centers of the circles have cross positioning identification symbols. The top ends of the left and right eye position observation disks (7-1) and (7-2) can be fixed on the T-shaped vertical magnetic strip (9) to ensure that the T-shaped magnetic strip (9) vertically passes through the centers of the left and right eye position observation disks (7-1) and (7-2); the T-shaped vertical magnetic strip adsorption straight rod (8) is made of ferromagnetic material and is used to adsorb the T-shaped vertical magnetic strip (9). The surface has coordinate scale lines and is combined with the rectangular support platform (3) to determine the pupil distance and shoulder width size; The supplementary drive control replacement device for adjusting the distance between the left and right eye position observation disks is characterized in that the drive control replacement device fixing plate (5-1) is attached to the rectangular transparent organic glass plate (5) and is fixed vertically in the center on the horizontal rectangular support platform (3); the tube wall of the sliding rack guide tube (11) with a smooth inner surface is attached to the drive control replacement device fixing plate (5-1), the central axis generatrix directions of the same four sliding rack guide tubes (11) are all horizontally parallel, and the bearing of the driving gear (12) is fixed vertically on the drive control replacement device fixing plate (5-1); the left and right eye position observation disks (7-1) and (7-2) are fixed to the control plate a (14-1) and control plate b (14-2) of the left and right eye position observation disks respectively by straight rods whose extension lines pass through the center of the circle, and are respectively located in the same vertical plane. Parallel left and right eye control sliding racks (10-1) and (10-2) are connected; the left and right eye control sliding racks (10-1) and (10-2) pass through the sliding rack guide tube (11), and the outer surfaces of the left and right eye control sliding racks (10-1) and (10-2) match the inner diameter of the sliding rack guide tube (11); the driving gear (12) matches the left and right eye control sliding racks (10-1) and (10-2); the left and right eye control sliding racks (10-1) and (10-2) drive the left and right eye position observation disks (7-1) and (7-2); the driving gear (12) is controlled to rotate by a hand-cranked driving handle (13), and when it rotates counterclockwise, the distance between the control plate a (14-1) and the control plate b (14-2) of the left and right eye position observation disks increases; otherwise, the distance decreases; The component is composed of an observation end and an observed end, which are vertically connected in the middle by an objective lens distance control square rod (4). In order to prevent the objective lens distance control square rod (4) from falling off during use, through holes are provided at both ends of the objective lens distance control square rod (4) for passing anti-falling pins, and manual external force can change the distance between the observation end and the observed end; the observation end is fixed on the horizontal rectangular parallelepiped support platform (3) vertically and centrally by a rectangular transparent organic glass plate (5), and a T-shaped vertical magnetic strip (9) adsorbs a straight rod centrally fixed on the upper edge of the rectangular transparent organic glass plate (5); the left and right pupil position observation disks (7-1), (7-2) and the left and right side boundary rods (6-1), (6-2) of the shoulder width are respectively adsorbed on the T-shaped vertical magnetic strip adsorption straight rod (8) by the T-shaped vertical magnetic strip (9), and Closely attached to the rectangular transparent organic glass plate (5), symmetrically distributed on both sides of the objective lens spacing control square rod (4), the vertical extension lines of the T-shaped vertical magnetic strips (9) are aligned with the center of the left and right eye observation disks (7-1), (7-2) and the center lines of the left and right shoulder width boundary rods (6-1), (6-2); the observed end is fixed vertically and centered on the horizontal rectangular support platform (3) by the rectangular plane mirror (1), and ensured to be parallel to the rectangular transparent organic glass plate (5) at the observation end, and the objective lens spacing control square rod (4) is perpendicular to the vertically placed rectangular plane mirror (1) and the rectangular transparent organic glass plate (5); the upper ends of the left and right mirror limiting plates (2-1), (2-2) are hung on the rectangular plane mirror (1), and the lower ends are located in the slide groove on the rectangular support platform (3); A drive control replacement device for adjusting the distance between the left and right eye position observation disks (7-1) and (7-2) can be additionally placed at the observation end.

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