Table type optical system

Abstract

The utility model belongs to the field of optical display, and particularly relates to a table type optical system, which comprises a first part, a second part and a third part, the first reflecting mirror is arranged opposite to the light source; the second part is arranged opposite to the first part, and the second part comprises a light splitting module which is arranged opposite to the first reflecting mirror; the second reflecting mirror is arranged opposite to the light splitting module, and the second reflecting mirror is provided with a concave surface far away from the light splitting module; light rays emitted by the light source enter the first reflecting mirror, enter the light splitting mirror after being reflected and then are emitted to the second reflecting mirror through reflection of the light splitting module, and the light rays reflected by the second reflecting mirror penetrate through the light splitting module in a transmission mode to form a first image with a preset focal plane depth. The range of the preset focal plane depth is from-infinity mm to-1000 mm and from 1000 mm to + infinity mm. Through the arrangement, interference during watching of the first image is avoided.

Description

Technical Field

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

[0002] With the popularization of electronic devices, the time of using electronic devices is gradually increasing. In addition, people rely heavily on handheld electronic devices in daily life. The distance between the eyes and electronic devices is limited. Long-term close-up viewing can easily lead to excessive fatigue of the accommodation function, increased intraocular pressure or compression of the extraocular muscles. These are all causes of myopia.

[0003] In the prior art, there is a telescopic image display device that can present an image with a certain focal depth, and the image will not change with the distance between the viewer and the viewing window, so as to avoid the image being too close to the eyes. However, in such telescopic image display devices, due to limited space, the freedom of arrangement of optical devices is limited, so that the viewer can see the initial light source by adjusting the viewing angle at the viewing window, and the distance between the initial light source and the eyes is relatively close. Especially for the viewer, when it is difficult to watch an image at a long distance from the eyes or the viewer is distracted and easily disturbed, the image displayed by the initial light source can be directly seen. In addition, the initial light source is close to the observation window, so the viewer is more inclined to directly choose to watch the light source image, which cannot prevent myopia or relieve eye fatigue by watching the telescopic image. That is, it cannot meet the original intention of the user. Utility Model Content

[0004] The utility model is proposed based on the above-mentioned demand of the prior art, and the technical problem to be solved by the utility model is to provide a desktop optical system to avoid viewing interference.

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

[0006] A desktop optical system is provided, comprising: a first part, comprising a light source, providing light; a first reflector, arranged opposite to the light source; a second part, arranged opposite to the first part, the second part comprising a spectroscopic module, arranged opposite to the first reflector; a second reflector, arranged opposite to the spectroscopic module, the second reflector having a surface concave away from the spectroscopic module; light emitted by the light source is incident on the first reflector, and after reflection, is incident on the spectroscopic module, and then is emitted to the second reflector through reflection by the spectroscopic module, and the light reflected by the second reflector passes through the spectroscopic module in a transmission manner to form a first image with a preset focal plane depth, and the preset focal plane depth ranges from -∞mm to -1000mm and 1000mm to +∞mm.

[0007] Through the above-mentioned arrangement, the light source is set at a position far away from the spectroscopic module serving as the viewing window, and the relative position relationship between the two makes it impossible for the viewer to easily see the light source through the viewing window, effectively avoiding interference from the light source during viewing. In addition, the structure can form a long-distance first image, and the distance between the first image and the exit pupil position is 1m to infinity, preventing myopia or eye fatigue caused by long-term close viewing.

[0008] Preferably, the first part further comprises a lens, which is arranged between the light source and the first reflector, and two sides of the lens are respectively opposite to the light source and the first reflector.

[0009] The lens is set to correct the field curvature to ensure the normal presentation of the first image.

[0010] Preferably, the first part is movably arranged relative to the second part, and the first part moves in a direction away from or close to the second part.

[0011] By moving the first part, extending or shortening the distance between the first part and the second part, and thus changing the focal depth of the first image, such a setting can adjust the position of the first part according to the actual eye condition of the viewer until the focal depth of the corresponding first image is adapted to the viewer, and can be personalized to provide the required imaging for different users.

[0012] Preferably, the first part and the second part are integrally arranged.

[0013] Preferably, the first portion is located above the second portion.

[0014] This arrangement facilitates the adjustment of the first part, facilitates the spatial layout of the first part and the second part, makes the whole more stable, and also makes it difficult for viewers to easily see the content directly displayed by the light source.

[0015] Preferably, a local coordinate system is formed with the exit pupil position as the center, the direction from the exit pupil position toward the midpoint of the spectroscopic module as the Z axis, the direction above the Z axis as the Y axis, and the direction perpendicular to the YOZ plane as the X axis, the light source surface is parallel to the XOY plane, and the acute angle formed by the first reflector and the XOZ plane is in the range of 40° to 50°.

[0016] Preferably, the acute angle between the light splitting module and the XOZ plane ranges from 40° to 50°.

[0017] Preferably, the length of the desktop optical system in the Z-axis direction ranges from 130 mm to 170 mm.

[0018] Preferably, the length of the desktop optical system in the Y-axis direction ranges from 260 mm to 400 mm.

[0019] Preferably, the distance between the exit pupil center of the desktop optical system and the center of the light splitting module ranges from 180 mm to 245 mm.

[0020] Preferably, the desktop optical system has a horizontal exit pupil size greater than 100 mm, and a vertical exit pupil size greater than 60 mm.

[0021] Preferably, the focal length range of the desktop optical system is 280 mm to 400 mm.

[0022] Preferably, the desktop optical system displays a light path with a diagonal field of view greater than 30°.

[0023] Preferably, the first part and the second part are arranged separately, and the space where the first part is located is smaller than the space where the second part is located.

[0024] Compared with the prior art, the optical system observation window formed by the utility model is tilted downward, and the light source is arranged above the observation window. When the viewer is watching in the prescribed manner, the image displayed by the light source cannot be seen. Only when the viewer bends down and looks up can the light source be directly seen. This viewing position is uncomfortable and difficult to watch, thereby effectively avoiding the viewer from choosing this angle for viewing, that is, the first image formed by the optical system can only be formed at a prescribed position. The first image has a focal plane depth greater than or equal to 1m, and does not change with the approach or distance of the viewer, which can effectively prevent myopia or eye fatigue caused by watching the first image at a close distance for a long time. In addition, the first part and the second part can be relatively close or far away, so as to adjust the focal plane depth of the first image. According to the different eye conditions of different viewers, the distance between the first part and the second part is adjusted, so that the focal plane depth of the first image is adapted to the viewer, thereby providing a good user experience for the viewer. In addition, the first part and the second part are arranged up and down to provide design space for the design of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a schematic diagram of the structure of optical elements of the desktop optical system in the utility model;

[0027] Figure 2 It is a structural schematic diagram of the movement process of the first part of the desktop optical system in the utility model;

[0028] Figure 3 A schematic diagram of the coordinate system of the desktop optical system of the utility model;

[0029] Figure 4 It is a schematic diagram of the optical path structure when the first part of an implementation scheme of the desktop optical system of the utility model is located at a certain position;

[0030] Figure 5 This is a schematic diagram of the optical path structure when the first part of an implementation scheme of the desktop optical system of the utility model is located at another position.

[0031] Reference numerals:

[0032] 1. The first part; 2. The second part; 3. The second reflector; 4. The first reflector; 5. The lens; 6. The light source; 7. The spectrometer module; 8. The exit pupil; 9. The first image. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] This embodiment provides a desktop optical system, such as Figure 1-Figure 5 shown.

[0038] The desktop optical system comprises a first part 1 and a second part 2 arranged relatively to each other. Figure 1 The first part 1 includes a light source 6 and a first reflector 4. The second part 2 includes a light splitting module 7 and a second reflector 3.

[0039] like Figure 3 As shown, in order to conveniently show the relative positional relationship of each optical device, the formed desktop optical system takes the center of the exit pupil 8 as the origin O, the direction from the exit pupil 8 to the center of the light splitting module 7 as the Z axis, the upward direction perpendicular to the Z axis as the Y axis, and the direction perpendicular to the YOZ plane as the X axis. The Z axis is the right, the Y axis is the top, and the X axis is the front.

[0040] The light source 6 is used to provide light required by the desktop optical system.

[0041] Exemplarily, the light source 6 may be a display screen, or lamp beads arranged in a certain order, the colors of the lamp beads may remain unchanged, may change, and may also change according to dynamic images.

[0042] The first reflector 4 is arranged opposite to the light source 6 and is a plane mirror. The first reflector 4 is arranged tilted toward and below the light source 6, and the angle formed between the plane where the first reflector 4 is located and the plane where the light source 6 is located is in the range of 40° to 50°.

[0043] The light emitted by the light source 6 is incident on the first reflector 4 , and is reflected by the first reflector 4 and then emitted again.

[0044] Furthermore, the first part 1 further comprises a lens 5, which is arranged between the light source 6 and the first reflector 4, and the two sides of the lens 5 are respectively arranged opposite to the light source 6 and the first reflector 4. The field curvature of the desktop optical system is corrected by the lens 5 to ensure the quality of the first image 9 finally formed.

[0045] The light emitted by the light source 6 first passes through the lens 5 and is emitted toward the first reflector 4 . After being reflected by the first reflector 4 , the propagation path of the light is changed and the light is emitted.

[0046] The light splitting module 7 has a light splitting function. The light splitting module 7 may be a beam splitter. The light splitting module 7 may also include a light-transmitting plate and a light splitting film, and the light splitting film is disposed on the light-transmitting plate by coating or pasting.

[0047] The light splitting module 7 can split the light incident thereon into two light paths emitted in different directions. Specifically, the light splitting module 7 can allow a part of the light incident thereon to be transmitted to the outside of the light splitting module 7 along the original propagation direction, and at the same time, can allow another part of the light incident thereon to be output from the incident surface in the form of reflection. The splitting ratio of the light splitting module 7 determines the ratio of reflection and transmission of the light incident on the splitting film. Exemplarily, when the splitting ratio of the splitting film is 1:1, among the light incident on the plane splitting module 7, 50% of the light will be emitted in the form of transmission, and the remaining 50% of the light will be emitted in the form of reflection.

[0048] In the above case, the light emitted by the light source 6 will be incident on the light splitting module 7 after being reflected by the first reflector 4, forming an invalid light path passing through the light splitting module 7 in a transmission form and an effective light path passing through the light splitting module 7 in a reflection form. The effective light path will participate in forming the first image 9, while the invalid light path will be emitted outside the optical system or physically isolated by a special structure, and the invalid light path will not interfere with the formation and propagation of the effective light path.

[0049] The viewer will use the spectroscopic module as an observation window for viewing. Therefore, the relative positional relationship between the light source 6 and the spectroscopic module will determine whether the viewer can easily see the light source 6 through the spectroscopic module. If the light source 6 is horizontally arranged above the spectroscopic module 7, the image displayed by the light source 6 can still be seen directly through the plane spectroscopic module 7 at certain angles. For people such as teenagers who are not easy to concentrate, the light source 6 is likely to attract the attention of such people. The distance between the light source 6 and the spectroscopic module 7 is relatively close. When staring for a long time, it may cause myopia or cause eye fatigue. Therefore, the light source 6 is located at the upper right of the spectroscopic module 7, and the spectroscopic module 7 is tilted toward the direction and below where the exit pupil 8 is located. The acute angle between the plane where the spectroscopic module 7 is located and the plane where the light source 6 is located is in the range of 40° to 50°. By setting the above relative positional relationship, when the viewer watches the image formed by the optical system at the exit pupil 8 position, the image directly displayed by the light source 6 cannot be seen or cannot be easily seen, which can effectively avoid unnecessary interference.

[0050] The second reflector 3 is arranged opposite to the light splitting module 7, and has a surface that is concave away from the light splitting module 7. The effective light path formed by the light splitting module 7 will be emitted toward the second reflector 3, and will be emitted after being reflected by the second reflector 3.

[0051] Due to the relative positional relationship between the second reflector 3 and the spectroscopic module 7, the light reflected by the second reflector 3 will be incident on the spectroscopic module 7 again. At this time, the light passing through the spectroscopic module 7 is also divided into two paths. The light emitted in the reflected form is used as the effective light path to be emitted to the exit pupil 8 to form the first image 9; the light emitted in the transmitted form is used as the invalid light path to be emitted outside the desktop optical system, which does not affect the formation of the first image 9.

[0052] The light emitted by the light source 6 is reflected by the first reflector 4, reflected by the spectroscopic module 7, reflected by the second reflector 3 and transmitted by the spectroscopic module 7, thereby forming a first image 9 with a preset focal depth. The focal depth ranges from -∞mm to -1000mm and from 1000mm to +∞mm. The first image 9 is at least 1m away from the exit pupil 8, which can provide a suitable viewing distance for the viewer and prevent the pressure on the eyes caused by long-term viewing of close objects.

[0053] The structure in which the first part 1 and the second part 2 are arranged relatively to each other can provide design space for the optical system housing.

[0054] like Figure 1 and Figure 2 As shown, the first part 1 and the second part 2 can be relatively movably arranged, and the first part 1 can be arranged in a direction away from or close to the second part 2. When the first part 1 moves, the focal plane depth of the first image 9 can be changed. According to the eye conditions of different viewers, the relative position of the first part 1 and the second part 2 is adjusted, and then the focal plane depth of the first image 9 is adjusted to adapt to the eyes of the viewer, and the appropriate focal plane depth can be provided to the viewer in a personalized manner, thereby providing the viewer with a better user experience.

[0055] The first part and the second part can be arranged as an integrated structure or a split structure. When the split structure is adopted, the space where the first part is located is smaller than the space where the second part is located, so as to facilitate the movement of the two parts.

[0056] The desktop optical system formed above is as follows: Figure 3 As shown, the thickness T1 of the desktop optical system along the Z axis ranges from 130mm to 170mm, and the height T2 along the Y axis ranges from 260mm to 400mm. Observed at the exit pupil 8 position, at different focal depths, the diagonal field of view of the system display light path is greater than 30°. The horizontal exit pupil 8 size is greater than 100mm, and the vertical exit pupil 8 size is greater than 60mm. The focal length range of the optical system is 280mm to 400mm. The distance between the center of the exit pupil 8 and the center of the optical module ranges from 180mm to 245mm.

[0057] A specific implementation scheme is given below. Based on the optical parameters listed in Table 1 and Table 2, the optical system has a field of view of 30° and an exit pupil 8 diameter of 120 mm×60 mm. When the focal depth of the first image 9 is 2000 mm, the optical path formed by the optical system is as follows: Figure 4 As shown, the focal length of the corresponding optical system is 383 mm; when the focal depth of the first image 9 formed is -10000 mm, the optical path formed by the optical system is as follows Figure 5 As shown, the focal length of the corresponding optical system is 417mm.

[0058] Table 1 Optical system parameters when focal depth is 2000mm

[0059]

[0060]

[0061] Table 1 Optical system parameters when focal depth is -10000mm

[0062]

[0063]

[0064] Among the above surfaces, the surface that constitutes the sphere satisfies the equation: c is the inverse of the radius of curvature, and r is the radial distance from a point on the surface.

[0065] 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 desktop optical system, characterized in that: include: The first part, including the light source, provides light; A first reflector, arranged opposite to the light source; A second part is arranged opposite to the first part, the second part comprises a light splitting module, which is arranged opposite to the first reflector; a second reflector is arranged opposite to the light splitting module, the second reflector has a surface which is concave away from the light splitting module; The light emitted by the light source is incident on the first reflector, and after reflection, it is incident on the spectroscope, and then reflected by the spectroscope module and emitted to the second reflector. The light reflected by the second reflector passes through the spectroscope module in a transmission manner to form a first image of a preset focal plane depth, and the preset focal plane depth ranges from -∞mm to -1000mm and 1000mm to +∞mm.

2. The desktop optical system according to claim 1, characterized in that: The first part further includes a lens, which is arranged between the light source and the first reflector, and two sides of the lens are respectively opposite to the light source and the first reflector.

3. The desktop optical system according to claim 1 or 2, characterized in that: The first part is movably arranged relative to the second part, and the first part moves in a direction away from or close to the second part.

4. The desktop optical system according to claim 1 or 2, characterized in that: The first part and the second part are integrally arranged.

5. The desktop optical system according to claim 1 or 2, characterized in that: The first portion is located above the second portion.

6. The desktop optical system according to claim 1 or 2, characterized in that: A local coordinate system is formed with the exit pupil position as the center, the direction of the exit pupil position toward the midpoint of the spectrometer module as the Z axis, the direction above the Z axis as the Y axis, and the direction perpendicular to the YOZ plane as the X axis. The light source surface is parallel to the XOY plane, and the acute angle formed by the first reflector and the XOZ plane ranges from 40° to 50°.

7. The desktop optical system according to claim 6, characterized in that: The acute angle between the light splitting module and the XOZ plane ranges from 40° to 50°.

8. The desktop optical system according to claim 6, characterized in that: The length of the desktop optical system in the Z-axis direction ranges from 130 mm to 170 mm.

9. The desktop optical system according to claim 6, characterized in that: The length of the desktop optical system in the Y-axis direction ranges from 260 mm to 400 mm.

10. The desktop optical system according to claim 6, characterized in that: The distance between the exit pupil center of the desktop optical system and the center of the light splitting module ranges from 180 mm to 245 mm.

11. The desktop optical system according to claim 1 or 2, characterized in that: The desktop optical system has a horizontal exit pupil size greater than 100 mm and a vertical exit pupil size greater than 60 mm.

12. The desktop optical system according to claim 1 or 2, characterized in that: The focal length range of the desktop optical system is 280 mm to 400 mm.

13. The desktop optical system according to claim 1 or 2, characterized in that: The desktop optical system displays an optical path with a diagonal field of view greater than 30°.

14. The desktop optical system according to claim 1 or 2, characterized in that: The first part and the second part are arranged in a split type, and the space where the first part is located is smaller than the space where the second part is located.

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