Reading system

Abstract

The utility model belongs to the field of optical display, and particularly relates to a reading system, which comprises a first image source, a second image source, a third image source and a fourth image source, the first concave reflecting mirror is arranged opposite to the first image source; the spectroscope is arranged opposite to the first concave reflector, the light reflected by the first concave reflector enters the spectroscope and is reflected by the spectroscope to be emitted to the exit pupil, and a first image with a first focal plane depth is formed; the second image source emits light rays and is arranged opposite to the spectroscope, and the light rays emitted by the display enter the spectroscope and are reflected by the spectroscope to be emitted out; the second concave reflector is arranged opposite to the spectroscope, the light reflected by the spectroscope enters the second concave reflector, is reflected by the second concave reflector to enter the spectroscope, and is emitted to the exit pupil through the transmission of the spectroscope to form a second image with a second focal plane depth; the first focal plane depth and the second focal plane depth are both greater than 2m.

Description

Technical Field

[0001] The utility model belongs to the field of optical display, and in particular relates to a reading system. Background Art

[0002] Reading for a long time will cause great eye pressure. When the reading posture is incorrect and the eyes are too close to the reading material, it will cause myopia.

[0003] In addition, the degree of adjustment between the eyes and the reading material is limited. Even if the eyes are as far away from the reading material as possible while being able to see clearly, the adjustable range is not very large. In addition, during the reading process, the posture will not be paid attention to in real time. As time accumulates, the posture will change, and the autonomy to change the posture when the posture changes is also low. Especially for people with myopia, they will unconsciously move closer to the reading material. Utility Model Content

[0004] The present invention is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by the present invention is to provide a reading system to extend the distance between eyes and images to prevent and control myopia.

[0005] In order to solve the above problems, the technical solution provided by the utility model includes:

[0006] A reading system is provided, comprising: a first image source, capable of introducing reflected light into the reading system; a first concave reflector, arranged opposite to the first image source, and ambient light is incident on the first concave reflector based on the light introduced by the first image source; a beam splitter, arranged opposite to the first concave reflector, and the light reflected by the first concave reflector will be incident on the beam splitter, and will be emitted toward an exit pupil after being reflected by the beam splitter, so as to form a first image with a first focal plane depth; a second image source, emitting light, and arranged opposite to the beam splitter, and the light emitted by a display is incident on the beam splitter, and will be emitted after being reflected by the beam splitter; a second concave reflector, arranged opposite to the beam splitter, and the light reflected by the beam splitter will be incident on the second concave reflector, and will be incident on the beam splitter again after being reflected by the second concave reflector, and will be emitted toward the exit pupil through transmission of the beam splitter, so as to form a second image with a second focal plane depth; the first focal plane depth and the second focal plane depth are both greater than 2m.

[0007] Through the above arrangement, the image formed by the first image source and the second image source can be projected into a larger and deeper space, extending the distance between the viewer and the image being viewed, and the distance does not change easily as the viewer approaches or moves away from the image, thereby effectively controlling myopia.

[0008] Preferably, the first image source includes a desktop and a reading material placed on the desktop, and based on the diffuse reflection characteristics of the reading material, the ambient light is reflected onto the first concave reflector.

[0009] Through the above arrangement, it is possible to maintain far vision in the limited space of working at a desk, thereby solving the problem of myopia that is easily caused in working at a desk.

[0010] Preferably, the tabletop, the first concave reflector and the beam splitter form a first subsystem; the display, the beam splitter and the second concave reflector form a second subsystem; the first subsystem and the second subsystem can be used separately.

[0011] By setting up so that the subsystems can be used separately according to needs, more selectivity and freedom are provided.

[0012] Preferably, when the first subsystem and the second subsystem are used simultaneously, the first image and the second image are coupled.

[0013] Through the above settings, the imaging pattern can be adjusted according to needs, and then combined with virtual reality.

[0014] Preferably, the second image source comprises a display, which displays a digital positive defocused image in a display area corresponding to a peripheral field of view at an exit pupil, and the peripheral field of view corresponds to a field of view range of 10° to 15°.

[0015] Through the above arrangement, the second image will fall in front of the viewer's retina, forming myopic peripheral defocus, thereby prompting the retina to move forward and preventing the axial line from moving backward to cause myopia.

[0016] Preferably, the diagonal field of view of the reading system is not less than 30°, and the exit pupil diameter is greater than 100 mm×60 mm.

[0017] The above settings ensure the image size, so that viewers have a good viewing experience.

[0018] Preferably, a coordinate system is established with the center of the exit pupil as the origin, the direction of the exit pupil pointing to the optical element along the horizontal plane as the Z axis, the direction of the horizontal plane perpendicular to the Z axis as the X axis, and the direction perpendicular to the XOZ plane toward the top as the Y axis; the distance range from the center of the desktop to the XOY plane is 100mm~240mm, and the distance range between it and the XOZ plane is 140mm~450mm, and the acute angle range between the plane where the desktop is located and the XOY plane is 75°~90°; the distance range between the center of the display and the XOY plane is 300mm~440mm, and the distance range between it and the XOZ plane is 110mm~240mm, and the acute angle formed by the plane where the display is located and the XOY plane is 60°~85°.

[0019] Preferably, the distance between the center of the first concave reflector and the XOY plane ranges from 200 mm to 350 mm, and the distance between it and the XOZ plane ranges from 100 mm to 200 mm, the acute angle between the tangent surface of the first concave reflector and the XOY plane ranges from 70° to 90°, and compared with the desktop, the distance between the first concave reflector and the exit pupil is farther.

[0020] Preferably, the distance between the center of the beam splitter and the XOY plane ranges from 260 mm to 400 mm, and the distance between the center of the beam splitter and the XOZ plane ranges from 0 to 30 mm. The acute angle between the plane where the beam splitter is located and the XOY plane ranges from 20° to 40°. Compared with the first concave reflector, the distance between the beam splitter and the exit pupil is farther.

[0021] Preferably, the distance between the center of the second concave reflector and the XOY plane ranges from 350 mm to 600 mm, and the distance between it and the XOZ plane ranges from 0 to 30 mm. The acute angle formed between the cut surface of the second concave reflector and the XOY plane ranges from 0° to 5°. Compared with the beam splitter, the distance between the second concave reflector and the exit pupil is farther.

[0022] Compared with the prior art, the solution of the utility model forms two subsystems, namely, a first subsystem imaged by a first image source and a second subsystem imaged by a second image source, and the optical paths of the two subsystems are independent of each other, that is, any one of the subsystems can be used arbitrarily, but at the same time, they have a common optical element to reduce the occupied volume of the system, and the optical paths of the two subsystems can be coupled at the exit pupil. For the first subsystem, the image formed by the reading material can be projected into a farther space, and will not be easily changed due to the approach of the viewer, and the distance between the image of the reading material and the eyes is extended to prevent myopia caused by too close distance. In addition, the second image of the display is presented through another optical path at the same time, and the second image can also be imaged at a distance to ensure the distance between the eyes and the image. In addition, the simultaneous use of the first subsystem and the second subsystem can realize virtual display, and can also adjust the display to display a defocused stimulation image with a certain diopter, which is superimposed on the first image formed by the reading material, so as to form myopic defocus stimulation in the peripheral visual field without affecting the main visual field, so as to effectively inhibit the elongation of the eye axis. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 The structure and optical path diagram of the reading system in the embodiment of the utility model;

[0025] Figure 2 It is another structure and optical path schematic diagram of the reading system in the embodiment of the utility model;

[0026] Figure 3 This is a schematic diagram of the optical path structure of the first subsystem in the embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the optical path structure of the second subsystem in the embodiment of the utility model;

[0028] Figure 5 A schematic diagram of a coordinate system established in a reading system in an embodiment of the present utility model;

[0029] Figure 6 The figure is a schematic diagram of the optical path structure of a reading system corresponding to a feasible implementation scheme in the embodiment of the utility model.

[0030] Reference numerals:

[0031] 1. Exit pupil; 2. Beam splitter; 3. First concave reflector; 4. Desktop; 5. Second concave reflector; 6. Display; 8. First image. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection can be a mechanical connection, or an electrical connection can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0035] To facilitate understanding of the embodiments of the present application, further explanation will be given below with reference to specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present application.

[0036] This embodiment provides a reading system such as Figure 1-Figure 6 shown.

[0037] like Figure 1 and Figure 2 As shown, the reading system includes a first image source, a first concave reflector, a beam splitter 2 , a second image source and a second concave reflector 5 .

[0038] The first image source can guide the reflected light into the reading system, that is, the first image source only needs to have a reflective property.

[0039] Furthermore, the first image source includes a desktop 4 and a reading material carried on the desktop 4. The reading material has a diffuse reflection property, so that it can reflect the ambient light incident thereon.

[0040] The first concave reflector 3 is arranged opposite to the table top 4, and the first concave reflector 3 is arranged above the table top 4. Furthermore, the middle part of the first concave reflector 3 is concave in a direction away from the table top 4. The ambient light diffusely reflected by the table top 4 is incident on the first concave reflector 3, and is reflected by the first concave reflector 3 and emitted.

[0041] The beam splitter 2 is arranged opposite to the first concave reflector 3. The light incident on the beam splitter 2 can be split into two paths, one of which is emitted after being reflected by the beam splitter 2, and the other is emitted after being transmitted by the beam splitter 2. The light incident on the beam splitter 2 is reflected and transmitted in a certain ratio, and the specific reflection and transmission ratio is determined by the splitting ratio of the beam splitter 2 itself. When the splitting ratio is 1:1, 50% of the incident light is transmitted and the other 50% is reflected.

[0042] Beamsplitters include various optical elements that can achieve both reflection and transmission.

[0043] The light reflected and output by the first concave reflector 3 will be incident on the beam splitter 2. The light reflected in the light received by the beam splitter 2 is the effective light, which can be emitted to the exit pupil 1 of the reading system to form a first image 8 with a first focal plane depth, and the first focal plane depth is greater than 2000mm. The light transmitted in the light received by the beam splitter 2 will be emitted from another direction, does not affect the imaging at the exit pupil 1, and is the invalid light.

[0044] like Figure 3As shown, a first optical path is formed based on the above optical elements. The first optical path includes ambient light incident on a reading material and then diffusely reflected. After the diffusely reflected light enters the first concave reflector 3, it is reflected by the first concave reflector 3 and then incident on the beam splitter 2. The beam splitter 2 reflects part of the incident light and emits it toward the exit pupil 1, forming a first image 8.

[0045] The second image source emits light. The second image source is a light source. For example, the second image source is a display 6 that can display an image pattern and emit light. The display 6 is arranged at a certain inclination angle with the horizontal plane.

[0046] The display 6 is arranged opposite to the beam splitter 2 so that the light emitted by the display 6 can be incident on the beam splitter 2. Similarly, based on the beam splitting characteristics of the beam splitter 2, the incident light will be divided into two paths for emission, among which the light output in the form of reflection is effective light, and the light output in the form of transmission is invalid light.

[0047] The second concave reflector 5 is arranged opposite to the beam splitter 2. The second concave reflector 5 is concave in the direction away from the beam splitter 2. The light reflected by the beam splitter 2 is incident on the second concave reflector 5, and the light can be incident on the beam splitter 2 again after being reflected on the second concave reflector 5. The light path formed by the incident light includes a reflection output path and a transmission output path. The light output in the form of transmission is effective light, which will be emitted to the exit pupil 1 to form a second image with a second focal plane depth, and the second focal plane depth is greater than 2000mm. The light output in the form of reflection is invalid light, which will be output from the reading system and will not participate in the formation of the image.

[0048] like Figure 4 As shown, a second optical path is formed based on the display 6, the beam splitter 2 and the second concave reflector 5, including that after the light emitted by the display 6 is incident on the beam splitter 2, part of the light is reflected by the beam splitter 2 and is incident on the second concave reflector 5, and then is incident on the beam splitter 2 after being reflected by the second concave reflector 5, the beam splitter 2 transmits part of the incident light and emits it to the exit pupil 1 to form a second image.

[0049] The first subsystem formed by the first optical path and the second subsystem formed by the second optical path have the same exit pupil 1, so that the first image 8 formed by the reading material through the first subsystem and the second image formed by the display 6 through the second subsystem are coupled in the exit pupil 1 and can enter the viewer's eyes at the same time. Thus, the display 6 can be controlled to display a specific digital defocus pattern in an area corresponding to the viewer's peripheral visual field, and the peripheral visual field corresponds to the field of view range of 10° to 15° of the exit pupil. Without affecting the imaging of the main visual field, the viewer can form peripheral myopia defocus stimulation while watching the reading material, so as to effectively inhibit the elongation of the eye axis and prevent and control myopia.

[0050] Furthermore, the first subsystem and the second subsystem can be used separately. If you want to receive the first image 8 of the reading material alone, you can turn off the display 6 to cut off the light source of the second subsystem; if you want to receive the second image of the display 6 alone, you can remove the reading material placed on the desktop 4 without affecting the presentation of the second image of the light source. The reading system can form three usage modes, namely, the first subsystem is used alone, the second subsystem is used alone, and the first subsystem and the second subsystem are used in combination. Viewers can choose different modes according to their own needs to achieve personalized adaptation.

[0051] In order to conveniently describe the relative position relationship of each component in the reading system, a reference coordinate system is established, such as Figure 5 As shown, the center of the exit pupil 1 is taken as the origin, the direction of the exit pupil 1 pointing to the optical element along the horizontal plane is taken as the Z axis, the direction of the horizontal plane perpendicular to the Z axis is taken as the X axis, and the direction perpendicular to the XOZ plane toward the upper side is taken as the Y axis.

[0052] The distance between the center of the desktop 4 and the XOY plane ranges from 100 mm to 240 mm, and the distance between the desktop 4 and the XOZ plane ranges from 140 mm to 450 mm. The acute angle between the plane where the desktop 4 is located and the XOY plane ranges from 75° to 90°. Preferably, the desktop 4 is parallel to the XOZ plane, that is, perpendicular to the XOY plane.

[0053] The distance between the center of the first concave reflector 3 and the XOY plane ranges from 200 mm to 350 mm, and the distance between the first concave reflector 3 and the XOZ plane ranges from 100 mm to 200 mm. The acute angle between the tangent plane at the center of the first concave reflector 3 and the XOY plane ranges from 70° to 90°. In addition, compared with the tabletop 4, the distance between the first concave reflector 3 and the exit pupil 1 is farther.

[0054] The distance between the center of the beam splitter 2 and the XOY plane ranges from 260 mm to 400 mm, and the distance between the center of the beam splitter 2 and the XOZ plane ranges from 0 to 30 mm. The acute angle between the plane where the beam splitter 2 is located and the XOY plane ranges from 20° to 40°. In addition, compared with the first concave reflector 3, the distance between the beam splitter 2 and the exit pupil 1 is farther.

[0055] The distance between the center of the second concave reflector 5 and the XOY plane ranges from 350 mm to 600 mm, and the distance between it and the XOZ plane ranges from 0 to 30 mm. The acute angle formed between the cut surface at the center of the second concave reflector 5 and the XOY plane ranges from 0° to 5°. In addition, compared with the beam splitter 2, the distance between the second concave reflector 5 and the exit pupil 1 is farther.

[0056] The distance between the center of the display 6 and the XOY plane ranges from 300 mm to 440 mm, and the distance between it and the XOZ plane ranges from 110 mm to 240 mm. The acute angle formed by the plane where the display 6 is located and the XOY plane ranges from 60° to 85°. In addition, compared with the beam splitter 2, the distance between the display 6 and the exit pupil 1 is farther.

[0057] The diagonal field of view of the reading system formed based on the relative position relationship of the above optical elements is not less than 30°; the diameter of the exit pupil 1 is at least greater than 100mm×60mm. The first focal plane depth and the second focal plane depth of the first image 8 and the second image formed by the reading system are both greater than 2000mm

[0058] A feasible implementation scheme in this embodiment is given below. Figure 6 As shown, the formed reading system field of view is 36°, the diameter of the exit pupil 1 is 100 mm×60 mm, the first focal plane depth and the second focal plane depth are both greater than 2000 mm (the values ​​here only indicate the size, without the meaning of positive or negative, the positive value is the real image, and the negative value is the virtual image), Table 1 is the optical parameters of the first subsystem, and Table 2 is the optical parameters of the second subsystem. Based on the thickness of the first image 8 in Table 1 and the thickness of the second image in Table 2, it can be seen that the first image 8 and the second image overlap in the figure (therefore, the second image is not marked in the figure).

[0059] The front surface of the beam splitter 2 is a side of the beam splitter 2 close to the exit pupil 1 , and the rear surface of the spectrometer is a side of the beam splitter 2 away from the exit pupil 1 .

[0060] Table 1 Optical parameters of the first subsystem

[0061]

[0062] Table 2 Optical parameters of the second subsystem

[0063] Optical Surface Surface type Radius of curvature thickness Surface properties Eccentric type α Tilt Second Image Spherical unlimited -10000 refraction / / Exit pupil Spherical unlimited 280 refraction / / Beamsplitter front surface Spherical unlimited -120 reflection Eccentricity and bending -35 First concave reflector Free-form surface 314.11 270 reflection Eccentricity and bending -21.55 desktop Spherical unlimited 0 refraction / /

[0064] Among the optical surfaces mentioned above, the surface constituting the spherical surface satisfies the equation: c is the inverse of the radius of curvature, and r is the radial distance of a point on the surface. The surface constituting the free-form surface satisfies the equation: c is the inverse of the radius of curvature, r is the radial distance of a point on the surface, k is the quadratic constant, C i are the coefficients of the higher-order terms.

[0065] The surface type of the first concave reflecting mirror 3 is a free-form surface, and the corresponding free-form surface coefficients are shown in Table 3.

[0066] Table 3 Free surface coefficients of the first concave reflecting mirror 3

[0067]

[0068] Through the above settings, the images presented by the first image source and the second image source can be projected into a distant space, and will not change easily as the viewer approaches or moves away, thereby effectively preventing and controlling myopia. When the first subsystem and the second subsystem are used at the same time, the display of the second image source can be changed and debugged according to needs, which can realize the combination of virtual reality and myopia defocus stimulation.

[0069] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only the specific implementation method of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A reading system, characterized in that: include: a first image source capable of directing reflected light into the reading system; A first concave reflector is arranged opposite to the first image source, and the ambient light based on the light introduced by the first image source is incident on the first concave reflector; A beam splitter is arranged opposite to the first concave reflector, and the light reflected by the first concave reflector is incident on the beam splitter and is reflected by the beam splitter and emitted toward the exit pupil to form a first image with a first focal plane depth; A second image source emits light and is disposed opposite to the beam splitter, the light emitted by the display is incident on the beam splitter and is reflected by the beam splitter and emitted; A second concave reflector is arranged opposite to the beam splitter, the light reflected by the beam splitter will be incident on the second concave reflector, will be incident on the beam splitter again after being reflected by the second concave reflector, will be emitted to the exit pupil through transmission of the beam splitter, and will form a second image with a second focal plane depth; The first focal plane depth and the second focal plane depth are both greater than 2m.

2. The reading system according to claim 1, characterized in that: The first image source includes a desktop and a reading material placed on the desktop, and based on the diffuse reflection characteristics of the reading material, the ambient light is reflected onto the first concave reflector.

3. The reading system according to claim 2, characterized in that: The tabletop, the first concave reflector and the beam splitter form a first subsystem; the display, the beam splitter and the second concave reflector form a second subsystem; the first subsystem and the second subsystem can be used separately.

4. The reading system according to claim 3, characterized in that: When the first subsystem and the second subsystem are used simultaneously, the first image and the second image are coupled, and at this time, the focal plane depths of the two subsystems are the same.

5. The reading system according to claim 4, characterized in that: The second image source comprises a display, wherein the display displays a digital positive defocused image in a display area corresponding to a peripheral field of view at an exit pupil, wherein the peripheral field of view corresponds to a field of view range of 10° to 15°.

6. The reading system according to claim 1, characterized in that: The diagonal field of view of the reading system is not less than 30°, and the exit pupil diameter is greater than 100 mm×60 mm.

7. The reading system according to claim 2, characterized in that: A coordinate system is established with the center of the exit pupil as the origin, the direction of the exit pupil pointing to the optical element along the horizontal plane as the Z axis, the direction of the horizontal plane perpendicular to the Z axis as the X axis, and the direction perpendicular to the XOZ plane pointing upward as the Y axis; The distance between the center of the desktop and the XOY plane ranges from 100mm to 240mm, and the distance between it and the XOZ plane ranges from 140mm to 450mm. The acute angle between the desktop plane and the XOY plane ranges from 75° to 90°. The distance between the center of the display and the XOY plane ranges from 300 mm to 440 mm, and the distance between it and the XOZ plane ranges from 110 mm to 240 mm, and the acute angle formed by the plane where the display is located and the XOY plane ranges from 60° to 85°.

8. The reading system according to claim 7, characterized in that: The distance between the center of the first concave reflector and the XOY plane ranges from 200 mm to 350 mm, and the distance between it and the XOZ plane ranges from 100 mm to 200 mm. The acute angle between the cut surface at the center of the first concave reflector and the XOY plane ranges from 70° to 90°, and compared with the desktop, the distance between the first concave reflector and the exit pupil is farther.

9. The reading system according to claim 8, characterized in that: The distance between the center of the beam splitter and the XOY plane ranges from 260 mm to 400 mm, and the distance between it and the XOZ plane ranges from 0 to 30 mm. The acute angle between the plane where the beam splitter is located and the XOY plane ranges from 20° to 40°. Compared with the first concave reflector, the distance between the beam splitter and the exit pupil is farther.

10. The reading system according to claim 9, characterized in that: The distance between the center of the second concave reflector and the XOY plane ranges from 350 mm to 600 mm, and the distance between it and the XOZ plane ranges from 0 to 30 mm. The acute angle formed between the cut surface at the center of the second concave reflector and the XOY plane ranges from 0° to 5°. Compared with the beam splitter, the distance between the second concave reflector and the exit pupil is farther.

Images