CN116520564A - Virtual image distance acquisition system and method based on double-reflection type remote instrument - Google Patents

Abstract

The invention relates to a virtual image distance acquisition system and a method based on a double-reflection type remote instrument, wherein the method comprises the following steps: firstly, obtaining the distance between an objective lens and a reading object and marking the distance as a first object distance, and obtaining the distance between an ocular lens and the objective lens and marking the distance as a second object distance; secondly, obtaining the virtual image distance of the ocular according to the first object distance and the second object distance and recording the virtual image distance as a first image distance; finally, the first image distance is displayed to a user through the display module, so that virtual image distance display of the ocular is achieved, the user can directly observe the distance in the actual use process, the use experience is further improved, and convenience is provided for parents to timely know the eye distance of the child.

Description

A virtual image distance acquisition system and method based on a double-reflection telephoto device

technical field

The invention relates to the technical field of myopia prevention, in particular to a virtual image distance acquisition system and method based on a double-reflection telephoto device.

Background technique

There are many people suffering from myopia in modern society. Unhealthy eye use is the main reason. At the same time, there are no good devices and methods for protecting eyesight and preventing myopia in the prior art. Therefore, attention should be paid to protecting eyesight and preventing myopia. The research on the device and method shows that the eyes of the students are in the growth and development period. The students study a lot and use their eyes for a long time. The unhealthy use of the eyes by the students will cause great damage to the eyes of the students. The young age determines to a certain extent that students have insufficient understanding of the importance of protecting eyesight and preventing myopia and lack of initiative and self-consciousness in the behavior of protecting eyesight and preventing myopia. It is best to learn from elementary school students to develop good habits of healthy eye use, starting with the research and promotion of good devices and methods for protecting eyesight and preventing myopia.

Children's long-term sitting posture is not standardized during the learning process, and the unreasonable viewing angle leads to an increasing incidence of myopia and a hunched figure. Therefore, most parents will purchase a special learning device for their children. This learning device Generally, it is composed of two mirrors and a bracket that are set opposite to each other. The eyepiece is a concave mirror and the objective lens is a convex mirror. Through the two reflections of the two mirrors, the distance between the book object and the child's glasses is extended. However, in In the actual use process, since the relative position adjustment of the two mirrors and the reading object is realized by the user according to his own experience, this results in inconsistent distances of the virtual images in the eyepiece after each adjustment, so that the user's eye distance cannot be obtained. Guarantee, therefore, it is necessary to propose a virtual image distance acquisition system and method based on double-reflection telephotometers to solve the above problems.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art, to provide a virtual image distance acquisition system and method based on a double-reflection telephoto device, which can solve the problem well above question.

The technical solution adopted for the present invention to solve the technical problems to achieve the above-mentioned requirements is:

An acquisition method of a virtual image distance acquisition system based on a double-reflection telemeter is provided, and the method includes the following steps:

Obtain the distance between the objective lens and the reading object and record it as the first object distance, obtain the distance between the eyepiece and the objective lens and record it as the second object distance;

Obtain the virtual image distance of the eyepiece according to the first object distance and the second object distance and record it as the first image distance;

The first image distance is displayed to a user.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephoto instrument according to the present invention, wherein the virtual image distance of the eyepiece is acquired according to the first object distance and the second object distance and recorded as the first An image distance includes

According to the eyepiece imaging formula K1: Among them, P ₁ =Y+Q ₂ , solve for Q ₁ ;

According to the objective lens imaging formula K2: Among them, P ₂ =X, solve for Q ₂ ;

Substitute Q ₂ into K1 to solve Q ₁ , where,

Wherein, X and Y are both constants and respectively represent the first object distance and the second object distance, _Q1 represents the first image distance, and _Q2 represents the image distance of the objective lens.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer according to the present invention, wherein the first measurement point is marked on the objective lens, and the linear distance between the first measurement point and the reading object is the first measurement point an object distance;

Wherein, the first measurement point is the center point of the objective lens, and the distance between the first measurement point and the center point of the eyepiece is the second object distance.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer of the present invention, wherein, X is acquired by the following method:

Obtain the first horizontal distance between the objective lens and the reading object as the first vertical side of the right triangle, and denote it as G;

Obtain the first vertical distance between the objective lens and the horizontal plane where the reading object is located as the second vertical side of the right triangle, and denote it as H ₂ ;

Find X according to G and H ₂ ;

Wherein, Y is a constant and its value range is 5-35, and the unit is centimeter.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer according to the present invention, wherein, the value of Y is 15 or 17.8,

When the value of Y is 15, the eyepiece and the objective lens are used to watch a mobile phone or a notebook computer;

When the value of Y is 17.8, the eyepiece and the objective lens are used for viewing books.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer according to the present invention, wherein the second measurement point is marked on the eyepiece, the second measurement point is located at the lower end of the eyepiece, and the The vertical distance between the second measurement point and the horizontal plane where the reading object is located is H ₀ ;

When Y takes a value of 15, H ₂ =H ₀ +0.2, then Substituting X into K2 to solve Q ₂ , substituting Q ₂ into K1 to solve Q ₁

And display _Q1 to the user through the display screen;

When the value of Y is 17.8, at this time, the upper end of the objective lens is tilted forward by 15 degrees, H ₂ =H ₀ -0.4, then Substitute X into K2 to solve Q ₂ , and substitute Q ₂ into K1 to solve Q ₁ ;

And display _Q1 to the user.

In addition, the present invention also provides a virtual image distance acquisition system based on a double-reflective telemeter, which includes

The objective lens, whose reflective surface is convex, is used to reflect the object image of the reading material on the desktop;

The eyepiece, whose reflective surface is concave, is used to reflect the virtual image of the objective lens into the human eye;

The distance acquisition module acquires the first object distance of the objective lens according to the distance between the objective lens and the reading object, and generates first distance information corresponding to the first object distance;

The first control module calculates the first image distance according to the imaging formula of the objective lens and the eyepiece and the first distance information;

The display module is used to display the first image distance to the user.

The virtual image distance acquisition system based on double-reflection telephotometer according to the present invention, wherein the distance acquisition module includes

The first ranging module is used to obtain the vertical distance between the objective lens and the horizontal plane where the reading material is located, and is also used to obtain the horizontal distance between the objective lens and the reading material;

The second control module acquires the first object distance of the objective lens according to the vertical distance and the horizontal distance, generates the first distance information corresponding to the first object distance, and sends it to the first control module.

The virtual image distance acquisition system based on double-reflection telephotometer according to the present invention, wherein the system also includes

The mobile terminal is used for the user to view the first image distance.

The virtual image distance acquisition system based on double-reflection telephotometer according to the present invention, wherein the system also includes

The second distance measuring module is used to obtain the vertical distance between the eyepiece and the horizontal plane where the reading object is located.

The beneficial effect of the present invention is: first obtain the distance between the objective lens and the reading object and record it as the first object distance, obtain the distance between the eyepiece and the objective lens and record it as the second object distance, and secondly according to the first object distance and the second object distance The object distance obtains the virtual image distance of the eyepiece and records it as the first image distance, and finally displays the first image distance to the user through the display module, thereby realizing the display of the virtual image distance of the eyepiece, so that the user can directly monitor the distance during actual use. Observation further improves the user experience and provides convenience for parents to know the child's eye distance in a timely manner, and each time it is used, it can directly compare the displayed value with the actual adjusted position in real time, avoiding the traditional only The use of adjusting the eye distance based on experience ensures a higher consistency of the eye distance for each use, and further promotes the user to develop good eye habits.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below in conjunction with the drawings and embodiments. The drawings in the following description are only part of the embodiments of the present invention. Ordinary technicians can also obtain other drawings based on these drawings without paying creative work:

Fig. 1 is a flow chart of the acquisition method of the virtual image distance acquisition system based on the double-reflection telephoto instrument of the present invention.

Fig. 2 is a schematic diagram of the structure and optical path of the virtual image distance acquisition system based on the double-reflection telephoto device of the present invention.

FIG. 3 is a schematic diagram of the system structure of the virtual image distance acquisition system based on the double-reflection telephoto device of the present invention.

Detailed ways

The terms "first", "second", "third" and "fourth" in the description and claims of the present invention and the drawings are used to distinguish different objects, rather than to describe a specific order . Furthermore, the terms "include" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

"Multiple" means two or more. "And/or" describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently. The character "/" generally indicates that the contextual objects are an "or" relationship.

Moreover, the terms "up, down, left, right, upper end, lower end, longitudinal direction" etc. representing orientation all refer to the posture position of the device or equipment described in this solution during normal use.

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be made below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, and Not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The acquisition method of the virtual image distance acquisition system based on the double-reflection telephoto instrument of the preferred embodiment of the present invention, as shown in Figure 1, the method includes the following steps:

Step S10: First, obtain the distance between the objective lens and the reading object 100 and record it as the first object distance, obtain the distance between the eyepiece and the objective lens and record it as the second object distance, wherein the objective lens is located at the front and bottom of the eyepiece, and the user Located on the front side of the eyepiece, when in use, the reading object is placed behind the eyepiece and reflected into the eyepiece through the objective lens, and then reflected into the human eye again;

Step S20: Secondly, obtain the virtual image distance of the eyepiece according to the first object distance and the second object distance and record it as the first image distance;

Step S30: Finally, display the first image distance to the user through the display module;

In turn, the display of the virtual image distance of the eyepiece can be realized, so that the user can directly observe the distance in the actual use process, which further improves the user experience, and provides convenience for parents to know the child's eye distance in time. When it is used, it can directly compare the displayed value with the actual adjusted position in real time, avoiding the traditional use of adjusting the eye distance based on experience, and ensuring that the eye distance used each time achieves a higher consistency. It promotes users to develop good eye habits and effectively reduces the incidence of myopia.

Wherein, step S20 specifically includes:

According to the imaging formula K1 of the eyepiece: Among them, P ₁ =Y+Q ₂ , solve for Q ₁ ;

According to the imaging formula K2 of the objective lens: Among them, P ₂ =X, solve for Q ₂ ;

Substituting Q ₂ into formula K1 to solve Q ₁ , we get

Wherein, X and Y are both constants and respectively represent the first object distance and the second object distance, _Q1 represents the first image distance, _Q2 represents the image distance of the objective lens, _f1 and _f2 represent the focal lengths of the eyepiece and the objective lens respectively, It can be seen that the size of Q ₁ can be known indirectly only by knowing the values of f ₁ , f ₂ , X and Y. In practice, the values of f ₁ and f ₂ are the built-in parameters of the eyepiece and objective lens, which are already Known value, while the distance Y between the objective lens and the objective lens of the learning instrument is fixed in the state of use, which is also a known value, and the only unknown value is X. At this time, X can be obtained through direct measurement by the user, or It is known from the direct measurement of the ranging sensor, so far, the relationship All the parameters in are known, and then the virtual image distance value _Q1 of the eyepiece can be calculated, and then it can be displayed to the user, and the user can adjust the position of the learning instrument or himself according to the displayed _Q1 value. It can be adjusted with reference to the sitting posture and other conditions of the user, avoiding the situation that the adjustment result is not ideal due to the adjustment based on the user's own experience.

Further, mark the first measurement point A1 on the objective lens, the linear distance between the first measurement point A1 and the reading object is the first object distance, wherein the first measurement point A1 is the center point of the objective lens, and the first measurement point A1 and the eyepiece The distance between the center point of the object is the second object distance, so as to avoid the fluctuation of the data caused by the difference in the positions of the two measurement points for measuring the distance in a large range, and finally affect the accuracy of the value of _Q1 , so as to ensure the accuracy of the final result.

Preferably, when using the learning instrument, the objective lens is positioned above the desktop 200 placed for reading (that is, the horizontal plane that is located), and the reading object is positioned behind the objective lens, as shown in Figure 2, therefore, the reading object and the objective lens are located at a right angle The two ends of the hypotenuse of the triangle, therefore, only need to calculate the two right-angled sides of the right-angled triangle to know the size of X, at this time, the two right-angled sides of the triangle can be obtained by manual measurement, or directly through the sensor Probe acquisition, therefore, X can be obtained through the following methods:

Obtain the first horizontal distance between the first measurement point A1 on the objective lens and the reading object as the first vertical side of the right triangle, and denote it as G;

Obtain the first vertical distance between the first measurement point A1 of the objective lens and the horizontal plane where the reading object is located as the second vertical side of the right triangle, and record it as H ₂ ;

Then according to G and H ₂ according to the Pythagorean theorem to calculate X, and then the value of Q ₁ can be known.

Preferably, Y is a constant with a value range of 5-35, and the unit is centimeter.

In practice, Y can take the value of 15 or 17.8;

When the Y value is 15, the eyepiece and objective lens are suitable for viewing mobile phones or laptops;

When the Y value is 17.8, the eyepiece and objective lens are suitable for viewing books.

Further, in order to reduce the impact of measurement errors on the final value of _Q1 caused by multiple measurement positions, mark the second measurement point A2 on the eyepiece, the second measurement point A2 is located at the lower end of the eyepiece, and record the distance from the second measurement point A2 to the reading object. The vertical distance of the horizontal plane is H ₀ , taking H0 as the reference and adding the error correction value to replace H2;

When the value of Y is 15, that is, when the user is watching electronic devices such as mobile phones or notebook computers, H ₂ =H ₀ +0.2, then according to the Pythagorean theorem, Substitute X into K2 to solve Q ₂ , and further substitute Q ₂ into K1 to solve Q ₁ ;

And display _Q1 to the user through the display screen;

And when the value of Y is 17.8, at this moment, the upper end of the objective lens is tilted 15 degrees forward, H ₂ =H ₀ -0.4, then Substitute X into K2 to solve Q ₂ , and substitute Q ₂ into K1 to solve Q ₁ ;

And display _Q1 to the user.

The virtual image distance acquisition system based on double-reflection telephotometer in a preferred embodiment of the present invention is used to realize the above-mentioned acquisition method, as shown in Figures 2 and 3, the system includes:

Objective lens 1, its reflection surface is a convex surface, is used for reflecting the object image of the reading material on the desktop, and wherein, the focal length of objective lens is half of the radius of the spherical surface where its reflection surface is;

Eyepiece 2, its reflective surface is a concave surface, which is used to reflect the virtual image of the objective lens into the human eye, wherein the focal length of the eyepiece is half the radius of the spherical surface where its reflective surface is located;

The distance acquisition module 3 acquires the first object distance of the objective lens according to the distance between the objective lens and the reading object, and generates first distance information corresponding to the first object distance;

The first control module 7 calculates the value of the first image distance according to the imaging formula of the objective lens and the eyepiece and the first distance information;

The display module 4 is configured to display the first image distance _Q1 to the user.

Preferably, the distance acquisition module 3 includes:

The first distance measuring module 31 is installed at the position of the first measurement point A1 on the objective lens, and is used to obtain the vertical distance between the objective lens and the horizontal plane where the reading object is located, and is also used to obtain the horizontal distance between the objective lens and the reading object;

The second control module 32 acquires the first object distance of the objective lens according to the vertical distance and the horizontal distance, generates first distance information corresponding to the first object distance, and sends it to the first control module.

Preferably, the system also includes:

The mobile terminal 5, specifically electronic equipment such as a mobile phone or a tablet computer, is loaded with a corresponding app for the user to view the first image distance, or to facilitate the user to input the value of X or Y to the second control module, thereby reducing the first image distance. Configuration of the ranging module.

Preferably, the system also includes:

The second ranging module 6 is installed at the position of the second measurement point A2 on the eyepiece, and is used to obtain the vertical distance between the eyepiece and the horizontal plane where the reading object is located.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

Claims (10)

1. an acquisition method of a virtual image distance acquisition system based on a double-reflection telemeter, it is characterized in that the method may further comprise the steps: Obtain the distance between the objective lens and the reading object and record it as the first object distance, obtain the distance between the eyepiece and the objective lens and record it as the second object distance; Obtain the virtual image distance of the eyepiece according to the first object distance and the second object distance and record it as the first image distance; The first image distance is displayed to a user. 2. the acquisition method of the virtual image distance acquisition system based on double-reflection telephotometer according to claim 1, characterized in that, the acquisition of the eyepiece distance according to the first object distance and the second object distance The virtual image distance and denoted as the first image distance include According to the eyepiece imaging formula K1: Among them, P ₁ =Y+Q ₂ , solve for Q ₁ ; According to the objective lens imaging formula K2: Among them, P ₂ =X, solve for Q ₂ ; Substitute Q ₂ into K1 to solve Q ₁ , where, Wherein, X and Y are constants and respectively represent the first object distance and the second object distance, Q ₁ represents the first image distance, Q ₂ represents the image distance of the objective lens, f ₁ and f ₂ represent the focal lengths of the eyepiece and the objective lens, respectively. 3. the acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer according to claim 2, wherein the first measurement point is marked on the objective lens, and the distance between the first measurement point and the reading object is marked on the objective lens. The linear distance is the first object distance; Wherein, the first measurement point is the center point of the objective lens, and the distance between the first measurement point and the center point of the eyepiece is the second object distance. 4. the acquisition method of the virtual image distance acquisition system based on double-reflective telephotometer according to claim 3, is characterized in that, X is acquired by the following methods: Obtain the first horizontal distance between the objective lens and the reading object as the first vertical side of the right triangle, and denote it as G; Obtain the first vertical distance between the objective lens and the horizontal plane where the reading object is located as the second vertical side of the right triangle, and denote it as H ₂ ; Find X according to G and H ₂ ; Wherein, Y is a constant and its value range is 5-35, and the unit is centimeter. 5. the virtual image distance acquisition system based on double-reflection telephotometer according to claim 4, characterized in that, the value of Y is 15 or 17.8, When the value of Y is 15, the eyepiece and the objective lens are used to watch a mobile phone or a notebook computer; When the value of Y is 17.8, the eyepiece and the objective lens are used for viewing books. 6. The acquisition method of the virtual image distance acquisition system based on the double-reflection telephotometer according to claim 5, wherein a second measurement point is marked on the eyepiece, and the second measurement point is located at the eyepiece The lower end of the lower end, remember that the vertical distance between the second measurement point and the horizontal plane where the reading material is located is H ₀ ; When Y takes a value of 15, H ₂ =H ₀ +0.2, then Substitute X into K2 to solve Q ₂ , and substitute Q ₂ into K1 to solve Q ₁ ; And display _Q1 to the user through the display screen; When the value of Y is 17.8, at this time, the upper end of the objective lens is tilted forward by 15 degrees, H ₂ =H ₀ -0.4, then Substitute X into K2 to solve Q ₂ , and substitute Q ₂ into K1 to solve Q ₁ ; And display _Q1 to the user. 7. A virtual image distance acquisition system based on a double-reflection telemeter, characterized in that the system includes The objective lens, whose reflective surface is convex, is used to reflect the object image of the reading material on the desktop; The eyepiece, whose reflective surface is concave, is used to reflect the virtual image of the objective lens into the human eye; The distance acquisition module acquires the first object distance of the objective lens according to the distance between the objective lens and the reading object, and generates first distance information corresponding to the first object distance; The first control module calculates the first image distance according to the imaging formula of the objective lens and the eyepiece and the first distance information; The display module is used to display the first image distance to the user. 8. The virtual image distance acquisition system based on double-reflection telephotometer according to claim 7, wherein the distance acquisition module includes The first distance measuring module is installed at the position of the first measurement point, and is used to obtain the vertical distance between the objective lens and the horizontal plane where the reading object is located, and is also used to obtain the horizontal distance between the objective lens and the reading object; The second control module acquires the first object distance of the objective lens according to the vertical distance and the horizontal distance, generates the first distance information corresponding to the first object distance, and sends it to the first control module. 9. the virtual image distance acquisition system based on double-reflection telephotometer according to claim 7, characterized in that, the system also includes The mobile terminal is used for the user to view the first image distance. 10. The virtual image distance acquisition system based on double-reflection telephotometer according to claim 7, characterized in that, the system also includes The second distance measuring module is installed at the second measuring point, and is used to obtain the vertical distance between the eyepiece and the horizontal plane where the reading object is located.