CN212905871U

CN212905871U - Reflective myopia-preventing reader

Info

Publication number: CN212905871U
Application number: CN202021700796.9U
Authority: CN
Inventors: 李成
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-15
Filing date: 2020-08-15
Publication date: 2021-04-06
Anticipated expiration: 2030-08-15

Abstract

Embodiments of the present disclosure provide a reflective myopia-prevention reader. This reflective myopia prevention reader includes: data receiving device, projection device and reflection device. The data receiving device is used for receiving machine coding content of the graphic image; the projection device is connected with the data receiving device, receives the machine coding content from the data receiving device, converts the machine coding content into a visible light graphic image, and projects the visible light graphic image; the reflection device is positioned on the light-emitting side of the projection device and used for receiving the visible light graphic image light projected by the projection device and reflecting the received visible light graphic image. The reflective myopia-preventing reader supplies a reader with a long-distance amplified virtual image, so that the reader can read remotely and avoid using eyes for a long time and a short distance.

Description

Reflective myopia-preventing reader

Technical Field

Embodiments of the present disclosure relate to a reflective myopia prevention reader.

Background

At present, the number of myopia of children and teenagers in China is increased along with the increase of age, the myopia degree is aggravated, and troubles are caused for many families. The long-term short-distance eye use is the main reason of myopia occurrence, and the factors of poor environmental illumination, undersize or fuzzy reading handwriting, overlong continuous reading time, lack of outdoor activities and the like further promote the occurrence and development of myopia. Juvenile myopia has become a social concern.

Currently, the closest technical solution to the present disclosure is to solve this problem by a reader product solution that generates an enlarged remote virtual image through a convex lens imaging technical solution. However, this solution is disadvantageous because the processing of the convex lens requires precise processing of the curved surfaces on both sides, the curved surfaces on both sides need to ensure a high precision position relationship with each other, and a single high-quality convex lens with a large aperture is difficult to manufacture and has a high cost, and is difficult to popularize in the market. Other problems, such as excessive bulk, visual vertigo, and virtual image distortion, are not ideal.

To solve the above problems, the present disclosure provides a reflective myopia prevention reader.

Disclosure of Invention

Embodiments of the present disclosure provide a reflective myopia-prevention reader. The reflective myopia prevention reader comprises: a data receiving device for receiving machine coding content of the graphic image; the projection device is connected with the data receiving device, receives the machine coding content from the data receiving device, converts the machine coding content into a visible light graphic image and projects the visible light graphic image; the reflecting device is positioned on the light-emitting side of the projecting device and used for receiving the visible light graphic image projected by the projecting device and reflecting the received visible light graphic image; the reflecting device comprises a first concave mirror with a reflecting layer, the reflecting device comprises a first concave mirror, the first concave mirror comprises a reflecting layer, the reflectivity of the reflecting layer to visible light is more than 85%, and the transmissivity of the reflecting layer to visible light is less than 10%; the area of the orthographic projection of the first concave mirror on a plane perpendicular to the main optical axis is more than 188 square centimeters; the focal length of the first concave mirror is larger than 150 mm. By using the technology, particularly under the condition of mutual matching, the eyesight refraction and the visual field of a user are well adjusted; under the condition of meeting the technical requirements of the projection area, the focal length matching and the reflecting layer, the visual fatigue of a user can be obviously reduced, and the myopia prevention effect is effectively realized.

In some examples, the first concave mirror further includes a light-transmitting portion located on a side of the reflective layer near a focal point of the first concave mirror, and an overall reflectance of the reflective layer and the light-transmitting portion to visible light is greater than 80%.

In some examples, at least a portion of the projection device is located on a side of the light-transmissive portion remote from the reflective layer.

The orthographic projection of the first concave mirror on a plane perpendicular to the main optical axis is a rectangle, the size of the long side of the rectangle is larger than 14.8 centimeters, and the size of the short side of the rectangle is larger than 10.5 centimeters.

In some examples, the long dimension of the rectangle is greater than 21 centimeters.

In some examples, the short dimension of the rectangle is greater than 15 centimeters.

In some examples, the light-transmissive portion is an injection-molded or compression-molded resin lens.

In some examples, the material of the resin lens includes PMMA.

In some examples, the projection device includes: at least one second concave mirror, wherein the second concave mirror comprises a reflecting layer, and the second concave mirror is positioned on one side, away from the reflecting layer of the first concave mirror, of the light-transmitting part of the first concave mirror; and the display device is positioned on one side where the focus of the second concave mirror is positioned. The focal length of the second concave mirror is smaller than that of the first concave mirror.

In some examples, the projection device includes: the optical lens group consists of a reflector and at least one convex lens; and the display device is positioned on one side of the at least one convex lens far away from the reflecting mirror and positioned within one-time focal length of the at least one convex lens, and the focal length of the at least one convex lens is smaller than that of the first concave mirror.

In some examples, the reflective myopia prevention reader comprises a controller and a camera connected to the controller and configured to capture a sitting posture of a reader and transmit the sitting posture information to the controller; the controller is configured to determine whether the sitting posture is correct and, in the event that the sitting posture is incorrect, prompt the reader to correct the sitting posture.

In some examples, the reflective myopia prevention reader further includes a first distance adjustment device configured to adjust a light transmission distance between the projection device and the first concave mirror. Thereby adjusting the distance between the virtual image and the eyes and relieving the eye fatigue.

In some examples, the reflective myopia-prevention reader further includes an angle adjustment device configured to adjust a deflection angle of the projection device relative to a main optical axis of the first concave mirror, so that an image projected by the projection device is incident on a substantially middle position of the first concave mirror.

In some examples, the area of the orthographic projection of the first concave mirror on a plane perpendicular to the main optical axis is greater than 312 square centimeters.

The reflective myopia-preventing reader comprises an image acquisition device, wherein the image acquisition device is configured to transmit acquired image information to a data receiving device.

In some examples, the focal length of the first concave mirror is greater than or equal to 500 mm.

In some examples, the reflective myopia prevention reader further comprises a second distance adjustment device configured to adjust a light transmission distance between the display device and the first concave mirror.

In some examples, an area of a forward projection of the first concave mirror on a plane perpendicular to a main optical axis is greater than 624 square centimeters.

In some examples, the reflective myopia prevention reader further comprises a light sensing device configured to automatically adjust the projected light intensity or to alert the user that the light intensity is not appropriate when the light darkness exceeds a threshold.

In some examples, the reflective anti-myopia reader further comprises a timer configured to remind a user to rest when the user watches the image for more than a set length of time.

In some examples, the reflective myopia prevention reader further comprises a speaker configured to audibly alert a user and to audibly broadcast reading material.

In some examples, the data receiving device is configured to receive image data from an external device and transmit to the projecting device. The external equipment comprises a computer, a mobile phone or a television.

The reflective myopia-preventing reader disclosed by the invention can achieve a good myopia-preventing effect by the technology; compared with the technical scheme of the convex lens, the processing difficulty is greatly reduced, the manufacturing cost is low, and high precision is easy to realize; the mirror reflection imaging effect is more suitable for human senses, and the discomfort such as dizziness and the like can not be caused just like daily mirror looking. The reflective myopia-preventing reader supplies a reader with a remote virtual image, so that the reader can read remotely and avoid using eyes for a long time and a short distance.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

FIG. 1 is a simplified block diagram of a reflective myopia prevention reader provided in accordance with an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a reflective myopia prevention reader with two concave reflectors and distance adjustment functions according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a reflective anti-myopia reader according to an embodiment of the present disclosure, which has a convex lens structure and distance adjustment functions;

FIG. 4 is a schematic diagram of a reflective myopia prevention reader with two concave reflectors according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a reflective anti-myopia reader with a convex lens according to an embodiment of the disclosure;

FIG. 6 is a schematic structural diagram of a first concave mirror of a reflective myopia-prevention reader according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of a projection of a first concave mirror of a reflective myopia-prevention reader on a plane perpendicular to a main optical axis according to an embodiment of the present disclosure.

Reference numerals:

1-a second camera; 2-a first camera; 3-a controller; 4-a projection device;

5-a display device; 6-a data receiving device; 7-a reflecting device;

8-a fourth distance adjustment device; 9-a first distance adjustment device; 10-angle adjusting means;

11-convex lens; 12-a fifth distance adjustment device; 13-a second concave mirror;

14-a sound box; 15-a photosensitive device; 16-a timer; 17-a mirror;

18-a second distance adjustment device; 19-third distance adjustment means; 20-a transparent lens;

21-a reflective layer; 22-main optical axis; 23-a first concave mirror; 24-plane.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

An embodiment of the present disclosure provides a reflective myopia-prevention reader. Fig. 1 is a simplified structural schematic diagram of a reflective myopia prevention reader according to an embodiment of the present disclosure, and fig. 2 is another structural schematic diagram of the reflective myopia prevention reader according to an embodiment of the present disclosure.

As shown in fig. 2, in the embodiment of the present disclosure, the reflective myopia prevention reader includes a first camera 2 facing the desktop, and captures the contents of the pages on the desktop or other reading materials, and transmits the data of the captured image to the data receiving device 6, and then the data receiving device 6 transmits the machine-coded contents of the image to the projecting device 4, for example, the machine-coded contents of the image are transmitted in binary codes. It should be noted that fig. 2 is a schematic structural diagram of the reflective myopia-prevention reader, and the specific structure is not limited thereto.

The data receiving device 6 receives the machine-encoded content of the graphic image transmitted from another device. The means for sending the graphic image content to the data receiving means 6 may be the own means of a reflective anti-myopia reader, such as a camera; or an external device, such as a computer host, or a mobile phone. The data receiving device 6 receives machine-encoded data of a graphic image instead of the graphic image of visible light; for example, the machine-encoded data is binary data content. The data receiving device 6 then transmits the machine-coded content to the projection device 4. The projection means 4 comprise a device for converting machine code into a visible light graphic image, for example a liquid crystal display.

The data receiving device 6 and the projecting device 4 can also be integrated on a single PCB board to form a module group to realize two functions of receiving machine coded data and projecting images. In its simplest form, the data receiving means 6 is a data receiving module such as a USB module or a bluetooth module. It is also possible for the developer to place the data receiving device, i.e., such a data receiving module, on the liquid crystal display. The two functions are only required to be included as long as the functions of receiving the machine coded data and converting the machine coded data into the graphic image of the visible light are included, and the two devices are in a separated form or a bound form, so that the embodiment of the disclosure is not limited.

The data receiving means 6 receives machine coding, e.g. binary coded content, of the graphical image, rather than the visible light form of the graphical image.

The projection device 4 comprises a device for converting machine code into visible light graphic images, such as a liquid crystal display, or a laser imaging device based on galvanometers or rotating mirrors.

As shown in fig. 1, the projection device 4 is a display screen that projects visible light rays of a graphic image. Reflecting means 7 is a first concave mirror 23, that is to say, in the embodiment of fig. 1, reflecting means 7 and first concave mirror 23 are one and the same. The reflecting device 7 is located on the light-emitting side of the projecting device 4, and the visible light rays emitted by the projecting device 4 (display screen) are projected onto the reflecting surface of the first concave mirror 23 and then reflected to the human eye.

As shown in fig. 6, the first concave mirror 23 is a concave mirror having the reflection layer 21, and the reflection layer 21 has a reflectance of more than 85% with respect to visible light and a transmittance of less than 10% with respect to visible light of the reflection layer 21. As shown in fig. 6, first concave mirror 23 further includes a light-transmitting portion 20, and light-transmitting portion 20 may be a transparent lens 20. The focal point of the first concave mirror 23 is located at the right side of the first concave mirror 23, and the left surface of the transparent lens 20 is a curved surface protruding to the left, which may be a spherical surface or a surface with other shapes, which is not limited in the present disclosure. The right surface of the transparent lens 20 may be a curved surface protruding to the left or a flat surface. The reflective layer 21 is disposed on the left side (i.e., the side away from the focal point) of the transparent lens 20. The total reflectance of reflection layer 21 and light-transmitting portion 20 with respect to visible light is greater than 80%, that is, the total reflectance of first concave mirror 23 with respect to visible light is greater than 80%. As shown in fig. 1 and 6, the first concave mirror 23 and the projection device 4 are located in such a manner that the right side of the first concave mirror 23 faces the projection device 4; that is, the transparent lens 20 of the first concave mirror 23 is on the side toward the projection device 4, and the reflective layer 21 of the first concave mirror 23 is on the side away from the projection device 4. The bonding surface of reflective layer 21 and transparent mirror 20 (i.e., the left side surface of the light-transmitting portion) forms the reflecting surface of first concave mirror 23. For example, the area of the orthographic projection of first concave mirror 23 on plane 24 perpendicular to main optical axis 22 is greater than 188 square centimeters. For example, the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is a rectangle. As shown in FIG. 7, the dimension of the long side L1 of the rectangle is 22 cm, and the dimension of the short side L2 is 16 cm. The focal length of the first concave mirror 23 is greater than 150 mm, for example, the focal length of the first concave mirror 23 is 200 mm in this embodiment. The transparent lens 20 is an injection molded resin lens, and the material is PMMA.

For example, the reflective layer 21 may be a coating film or a reflective coating layer, as long as the reflective function required by the present disclosure is achieved, and the material and form of the reflective layer 21 are not limited.

It should be noted that in some cases, for example, the concave surface of the concave mirror is not a perfect sphere due to the aberration, and the focal length of the concave mirror is not a value, but a range. In this case, the concave mirror focal length means the maximum value of the range, that is, the focal length of the first concave mirror 23 being greater than 150 mm means the upper limit of the range of the focal length being greater than 150 mm. All references to focal lengths in embodiments of the present disclosure are intended to mean the maximum value of the focal length range, i.e., the upper limit of the focal length range, if the focal length is not unique.

The transmittance of the reflective layer 21 for background light is less than 10%. The side of first concave mirror 23 away from the user's eyes is defined as the background side, that is, the side of first concave mirror 23 is the human eye and the other side of first concave mirror 23 is the background. The background light is transmitted to the side of the human eye through the reflection layer 21 of the first concave mirror 23 with a transmittance of less than 10%. Under this condition, reading is facilitated.

The reflective myopia-preventing reader is finally projected to human eyes after being reflected by the first concave mirror 23 in the form of a visible light image. All the graphic images related to the present disclosure are used to describe the visible light image, and the content may be a text or a picture, without limitation to the content.

The reflectivity of the reflecting layer 21 to visible light is more than 85%, and the asthenopia can be relieved under the condition. The area of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is more than 188 square centimeters, which is helpful for relieving astigmatism and myopia caused by ametropia; the focal length of the first concave mirror 23 is larger than 150 mm, so that the effect of being suitable for relaxing eye muscles can be better matched with other technologies.

The concept of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is explained below. As shown in fig. 6, the first concave mirror 23 has a main optical axis 22, and the plane 24 is perpendicular to the main optical axis 22. The first concave mirror 23 is coated with a reflective layer 21 on the left side surface. The first concave mirror 23 makes a projection on the plane 24 in the direction of the main optical axis 22, and the area of this projection is then larger than 188 square centimeters. The plane 24 is an auxiliary plane constructed to better explain the technical solution, and is a virtual plane. This method is the same as the auxiliary line theory constructed in the academic geometric proof. The forward projection of the first concave mirror 23 onto this plane 24 is rectangular.

The reflection type myopia prevention reader is compared with a myopia prevention reader adopting a convex lens imaging technical scheme, and the reflection type myopia prevention reader is better in imaging quality and reduces the vertigo of a user. Secondly, the imaging function of the reflector can be realized by controlling the curvature of a curved surface, so that the production is easier to reduce the image deformation caused by the curved surface problem; meanwhile, the production cost can be reduced. When the reflectance of the reflective layer 21 to visible light is greater than 85%, adverse effects of background stray light on image formation, for example, interference of background light incident from the left side of the first concave mirror 23 on image formation, can be effectively reduced. The area of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is larger than 188 square centimeters, the focal length of the first concave mirror 23 is larger than 150 millimeters, the two sizes are optimized photopic vision numerical values obtained by theoretical combination practice, particularly, under the condition that the sizes of the first concave mirror and the second concave mirror are matched with each other, the eyesight refraction and the visual field of a user are well adjusted, and experimental tests also show that the matching of the projection area and the focal length meeting the requirements can obviously reduce visual fatigue, so that the effect of preventing myopia is effectively achieved.

The technology can relieve the asthenopia of users and effectively prevent the myopia from further deepening. Preferably, when the area of the orthogonal projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is larger than 312 square centimeters, the long side of the rectangular projection is larger than 21 centimeters, the short side of the rectangular projection is larger than 15 centimeters, and the focal length of the first concave mirror 23 is larger than 500 millimeters, the reasonable collocation can build more suitable visual field and image distance, not only can prevent myopia from deepening, but also can make slight symptoms such as pseudomyopia turn to recovery.

In other embodiments, as shown in fig. 4, the projection device 4 comprises the second concave mirror 13 and the display device 5, wherein the display device 5 is a display screen. Second concave mirror 13 is located on the right side of first concave mirror 23 (reflection device 7) (the side of light-transmitting portion 20 of first concave mirror 23 away from reflection layer 21 of first concave mirror 23), and the shape of second concave mirror 13 is similar to the shape and structure of first concave mirror 23. For example, second concave mirror 13 also has a reflective layer, and the reflective layer of second concave mirror 13 is located on the right side of second concave mirror 13. The display device 5 is arranged within one focal length of the second concave mirror 13, and an enlarged virtual image is formed on the side of the second concave mirror 13 far away from the display device 5. The display device 5 sends out image light, transmits to the second concave mirror 13, and is transmitted to the reflecting device 7 through the reflection and amplification of the second concave mirror 13, and then is transmitted to the eyes of the user through reflection, and the user sees a virtual image amplified through two times of concave reflection. By arranging the second concave mirror 13, the length of the optical path can be increased, the curvature of the first concave mirror 23 can be reduced, the manufacturing difficulty can be reduced, and the problems of aberration and the like can be eliminated in a combined manner.

In other embodiments, the display device 5 may be replaced by a laser projection device, or other device for projecting images. The display device 5 is not limited to a display screen.

In other embodiments, as shown in fig. 5, the projection device comprises a display device 5, a convex lens 11 and a mirror 17, for example, the mirror 17 may be a plane mirror; the display device 5 is a display screen. The display screen of the display device 5 is arranged in one focal length of the convex lens 11, an enlarged virtual image is formed at one side, away from the display device 5, of the convex lens 11 at a position close to the focal point, the enlarged virtual image is reflected by the reflecting mirror 17 and sent to the projection device 7, and the projection device 7 is a first concave mirror 23. The virtual image of the display device 5 is within one focal length of the first concave mirror 23 so that the image of the display device 5 is magnified a second time and then delivered to the user's eyes. Similar with the technical effect of second concave mirror, through setting up convex lens, can increase optical path length, reduce the camber of first concave mirror to reduce the preparation degree of difficulty, can also make up and eliminate the aberration scheduling problem.

In other embodiments, as shown in fig. 1 and 6 and fig. 7, the area of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is greater than 624 square centimeters. The area of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 in the present embodiment is 625 square centimeters. A reader with an orthographic projection area larger than 624 square centimeters no longer has an interfering influence on the visual field of a user, and is the best reader. However, the first concave mirror 23 of this size is expensive to manufacture and the production and processing reject rate is not easily controlled.

In the embodiment of the present disclosure, as shown in fig. 2 and 4 in combination, the reflective myopia prevention reader further includes a third distance adjusting device 19 configured to adjust a light transmission distance between the second concave mirror 13 and the display device 5.

In other embodiments, as shown in conjunction with fig. 3 and 5, the reflective anti-myopia reader further includes a fourth distance adjustment device 8 configured to adjust a light transmission distance between the convex lens 11 and the display device 5.

In other embodiments, as shown in figure 3, the reflective anti-myopia reader further comprises a fifth distance adjustment device 12 configured to adjust the light transmission distance between the mirror 17 and the convex lens 11 and display device 5 components.

In other embodiments, the method comprises: a data receiving device 6 for receiving the machine-encoded content of the graphics image; the projection device 4 is connected with the data receiving device 6, receives the machine coding content sent by the data receiving device 6, converts the machine coding content into a visible light graphic image and projects the graphic image; the reflecting device 7 is used for receiving the image light projected by the projecting device 4, reflecting the received image light out and projecting the image light to human eyes; the reflecting device 7 comprises a first concave mirror 23 with a reflecting layer 21, the reflecting layer 21 has a reflectivity of more than 85% to visible light, and the area of the orthographic projection of the first concave mirror 23 on a plane 24 vertical to the main optical axis 22 is more than 188 square centimeters; the focal length of the first concave mirror 23 is more than 150 mm; the transmittance of the reflecting layer 21 to background light is less than 10%; the first concave mirror 23 is more than 200 mm from the human eye.

In some examples, the reflectance of visible light by first concave mirror 23 is greater than 80%.

The first concave mirror 23 comprises a reflecting layer 21 and a transparent lens 20, wherein one side of the transparent lens 20 is a concave surface, and the other side is a convex surface; the reflective layer 21 is disposed on the convex surface side of the transparent mirror 20, and the first concave mirror 23 is disposed on the side of the transparent mirror 20 facing the projection device 4.

The orthographic projection of the first concave mirror 23 on a plane 24 perpendicular to the main optical axis 22 is a rectangle, the long side dimension of the rectangle is larger than 14.8 centimeters, and the short side dimension of the rectangle is larger than 10.5 centimeters.

In some examples, the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is a rectangle, and more preferably, the long side dimension of the rectangle is larger than 21 cm.

In some examples, the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is a rectangle, and more preferably, the dimension of the short side of the rectangle is larger than 15 cm.

In some examples, the transparent lens 20 is an injection molded or compression molded resin lens.

In some examples, the material of the resin lens is PMMA.

In some examples, as shown in fig. 1 and 2, the projection device 4 includes: at least one second concave mirror 13, the second concave mirror 13 being a concave reflecting mirror; a display device 5 disposed on the concave side of the second concave mirror 13; the display device 5 projects an image, the image is reflected by the second concave mirror 13 and is projected to the reflecting device 7, and the reflecting device 7 is a first concave mirror 23; the focal length of second concave mirror 13 is smaller than the focal length of first concave mirror 23.

In some examples, as shown in fig. 1 and 3, the projection device 4 includes: an optical lens group, which is composed of a reflector 17 and at least one convex lens 11; a display device 5 disposed within one focal length of the convex lens 11; the display device 5 projects an image, the image is transmitted by the convex lens 11 and then reflected by the reflecting mirror 17, and the image is sent to the reflecting device 7, and the reflecting device 7 is a first concave mirror 23; the focal length of the convex lens 11 is smaller than the focal length of the first concave mirror 23.

In some examples, as shown in fig. 2 and 3, the reflective myopia-preventing reader includes a controller 3 and a second camera 1 facing the reader, the second camera 1 is connected to the controller 3 and configured to capture the sitting posture of the reader and transmit the sitting posture information to the controller 3; the controller 3 is configured to determine whether the sitting posture is correct and, in the event that the sitting posture is incorrect, to remind the reader to correct the sitting posture.

As shown in fig. 2 and 3, the reflective myopia-prevention reader further includes a first distance adjustment device 9 configured to adjust a light transmission distance between the projection device 4 and the reflection device 7 (i.e., the first concave mirror 23). According to the description of the above embodiments, the projection device 4 may be the display device 4 as shown in fig. 1, may include the second concave mirror 13 and the display device 5 as shown in fig. 4, and may further include the display device 5, the convex lens 11, and the reflecting mirror 17 as shown in fig. 5.

As shown in fig. 2 and 3, the reflective myopia prevention reader further includes an angle adjusting device 10 configured to adjust a deflection angle of the projection device 4 with respect to the main optical axis 22 so that an image projected by the projection device 4 is incident on a substantially middle position of the reflection device 7 (i.e., the first concave mirror 23).

For example, the area of the orthographic projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is larger than 312 square centimeters.

For example, as shown in fig. 2 and 3, the reflective myopia prevention reader includes an image capturing device, which is a first camera 2, and the first camera 2 transmits captured image information to the data receiving device 6.

For example, the focal length of first concave mirror 23 is 500 mm or more.

For example, as shown in fig. 2 and 3, the reflective myopia-prevention reader further includes a second distance adjustment device 18 configured to adjust a light transmission distance between the display device 5 and the first concave mirror 23. Thereby adjusting the distance between the magnified virtual image generated by the first concave mirror 23 and the human eye and relieving eyestrain.

In some examples, the area of the forward projection of the first concave mirror 23 on the plane 24 perpendicular to the main optical axis 22 is greater than 624 square centimeters.

For example, as shown in fig. 2 and 3, the reflective myopia prevention reader may further include a light sensing device 15, and the light sensing device 15 may automatically adjust the projected light intensity when the dim light exceeds a threshold value, or may give the user a warning that the light intensity is not appropriate. Thus, the eyes of the user can be protected to read under proper illumination.

For example, as shown in fig. 2 and 3, the reflective myopia prevention reader further includes a timer 16, which can remind the user to rest when the user watches the image for a time longer than a set time period.

For example, as shown in fig. 2 and 3, the reflective myopia-preventing reader further includes a sound box 14, which realizes the functions of voice reminding for the user and voice broadcasting for the reading material. Thus, eye use may sometimes be reduced.

For example, in a reflective myopia prevention reader, the data receiving device 6 is connected to the projection device 4, and the data receiving device 6 is configured to receive image data from an external device and transmit the image data to the projection device 4.

For example, the external device includes an electronic display device such as a computer, a mobile phone, or a television.

Besides being used for reading by students, the reflective myopia-preventing reader based on the technology disclosed by the invention can also be used for game machine display screens and display screens of electronic equipment such as computers and the like, and can also effectively prevent myopia.

The reflective myopia-preventing reader disclosed by the invention supplies a reader with a long-distance image, so that the reader can realize long-distance reading and avoid long-term short-distance eye use; the light ray detection function is provided, and poor environment illumination is avoided; providing enlarged reading content to avoid undersize or fuzzy reading handwriting; a reading time reminding function is provided, so that overlong continuous reading time is avoided; the sitting posture reminding function is provided, and the reading sitting posture is corrected. The purpose of preventing myopia can be achieved from multiple aspects through the functions.

The following points need to be explained:

(1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.

(2) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present disclosure, and shall be covered by the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A reflective reading device for preventing myopia is characterized in that it comprises,

a data receiving device for receiving machine coding content of the graphic image;

the projection device is connected with the data receiving device, receives the machine coding content from the data receiving device, converts the machine coding content into a visible light graphic image and projects the visible light graphic image;

the reflecting device is positioned on the light emergent side of the projecting device and used for receiving the visible light graphic image projected by the projecting device and reflecting the received visible light graphic image;

the reflecting device comprises a first concave mirror, the first concave mirror comprises a reflecting layer, the reflectivity of the reflecting layer to visible light is more than 85%, and the transmissivity of the reflecting layer to visible light is less than 10%; the area of the orthographic projection of the first concave mirror on a plane perpendicular to the main optical axis is more than 188 square centimeters; the focal length of the first concave mirror is larger than 150 mm.

2. The reflective myopia-prevention reader of claim 1 wherein the first concave mirror further comprises a light-transmissive portion, the light-transmissive portion being located on a side of the reflective layer proximate to the focal point of the first concave mirror, the reflective layer and the light-transmissive portion having an overall reflectivity for visible light of greater than 80%.

3. The reflective myopia prevention reader of claim 2 wherein at least a portion of the projecting means is located on a side of the light-transmissive portion remote from the reflective layer.

4. A reflective myopia-prevention reader according to claim 2 wherein the orthographic projection of the first concave mirror onto a plane perpendicular to the primary optical axis is a rectangle having a longer dimension greater than 14.8 cm and a shorter dimension greater than 10.5 cm.

5. A reflective myopia prevention reader according to claim 4 wherein the dimension of the long side of the rectangle is greater than 21 cm.

6. The reflective myopia prevention reader of claim 4, wherein the short dimension of the rectangle is greater than 15 cm.

7. The reflective myopia prevention reader of claim 2 wherein the light-transmissive portion is an injection molded or compression molded resin lens.

8. The reflective myopia prevention reader of claim 7 wherein the material of the resin optic includes PMMA.

9. The reflective myopia prevention reader of claim 2, wherein the projecting means includes,

at least one second concave mirror, wherein the second concave mirror comprises a reflecting layer, and the second concave mirror is positioned on one side, away from the reflecting layer of the first concave mirror, of the light-transmitting part of the first concave mirror;

a display device located on the side where the focus of the second concave mirror is located,

the focal length of the second concave mirror is smaller than that of the first concave mirror.

10. The reflective myopia prevention reader of claim 1, wherein the projecting means comprises,

the optical lens group consists of a reflector and at least one convex lens;

the display device is positioned on one side of the at least one convex lens far away from the reflector and is positioned within one time of the focal length of the at least one convex lens,

the focal length of the at least one convex lens is smaller than that of the first concave mirror.

11. The reflective myopia prevention reader of claim 1, comprising a controller and a camera coupled to the controller and configured to capture a sitting position of the reader and to communicate the sitting position information to the controller; the controller is configured to determine whether the sitting posture is correct and, in the event that the sitting posture is incorrect, prompt the reader to correct the sitting posture.

12. A reflective myopia prevention reader according to claim 1 further including a first distance adjustment means configured to adjust the distance of light transmission between the projection means and the first concave mirror.

13. A reflective myopia prevention reader according to claim 1 further including angle adjustment means arranged to adjust the angle of deflection of the projection means relative to the primary optical axis of the first concave mirror such that the image projected by the projection means is incident substantially midway along the first concave mirror.

14. A reflective myopia prevention reader according to claim 1 wherein the area of the orthographic projection of the first concave mirror on a plane perpendicular to the primary optical axis is greater than 312 square centimetres.

15. The reflective myopia prevention reader of claim 1, including an image capture device configured to transmit captured image information to the data receiving device.

16. A reflective myopia prevention reader according to any one of claims 1 to 15 wherein the focal length of the first concave mirror is 500 mm or greater.

17. A reflective myopia prevention reader according to claim 9 or claim 10 further including second distance adjustment means arranged to adjust the distance of light transmission between the display means and the first concave mirror.

18. A reflective myopia prevention reader according to claim 14 wherein the area of the orthographic projection of the first concave mirror on a plane perpendicular to the primary optical axis is greater than 624 square centimeters.

19. The reflective myopia prevention reader of claim 16, further comprising a light sensing device configured to automatically adjust the projected light intensity or to alert a user to an inappropriate light intensity when the dim light intensity exceeds a threshold value.

20. The reflective myopia prevention reader of claim 16, further comprising a timer configured to alert a user to rest when the user views the image for a time period exceeding a set length of time.

21. The reflective myopia prevention reader of claim 16, further comprising an audio speaker configured to provide voice alerts to a user and voice announcements of reading material.

22. The reflective myopia prevention reader of claim 16 wherein the data receiving means is configured to receive image data from an external device and transmit the image data to the projection means, the external device comprising a computer, a cell phone or a television.