Desktop type optical system

Abstract

The utility model belongs to the field of optical system display, and particularly relates to a desktop type optical system. Comprising a light source emitting light; the first optical processing part is arranged opposite to the light source and is used for receiving light rays emitted by the light source; the first optical processing part comprises a first transflective optical element and a first curved surface reflector, and the first curved surface reflector and the first transflective optical element are oppositely arranged; and the second optical processing part is arranged opposite to the first optical processing part, the second optical processing part comprises a second transflective optical element and a second curved surface reflecting mirror, and the second curved surface reflecting optical element is arranged opposite to the second transflective optical element. Through the setting, the use experience of a viewer is improved.

Description

Technical Field

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

[0002] The telescopic display screen in the prior art can form an image at a relatively long distance from the eye at the exit pupil, and the distance between the image and the eye does not change significantly with the distance between the eye and the display screen, thereby preventing the viewer's eyes from being affected by long-term viewing.

[0003] However, the image displayed by this type of telescopic display screen at the exit pupil is small in size and has a certain field of view limitation, which will affect the viewer's viewing experience. Utility Model Content

[0004] The present invention is proposed based on the above-mentioned requirements of the prior art. The technical problem to be solved by the present invention is to provide a desktop optical system to enhance the viewing experience of viewers.

[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 light source, emitting light; a first optical processing unit, arranged opposite to the light source, receiving the light emitted by the light source; the first optical processing unit comprising a first transflective optical element and a first curved reflector, the first transflective optical element being arranged on the propagation path of the light emitted by the light source, the first curved reflector being arranged opposite to the first transflective optical element, receiving the light transmitted through the first transflective optical element, and the first transflective optical element being arranged on the propagation path of the light reflected by the first curved reflector; a second optical processing unit, arranged opposite to the first optical processing unit, receiving the output light from the first optical processing unit, the second optical processing unit comprising a second transflective optical element and a second curved reflector, the second transflective optical element being arranged on the propagation path of the light reflected by the first transflective optical element; the second curved reflective optical element being arranged opposite to the second transflective optical element, receiving the light transmitted through the second transflective optical element, and the second transflective optical element being arranged on the propagation path of the light reflected by the second curved reflector.

[0007] On the premise that the position of the light source remains unchanged, the shorter the focal length of the optical system, the larger the final field of view angle is. By setting up two optical processing parts, the light emitted by the light source passes through the first optical processing part and the second optical processing part in sequence, thereby forming a secondary imaging, which is equivalent to a secondary magnification, thereby shortening the focal length, so that the field of view of the desktop optical system at the exit pupil is larger, which can bring a stronger visual experience to the viewer.

[0008] Preferably, the first transflective optical element is a plane beam splitter, and the second transflective optical element is a plane beam splitter.

[0009] The above arrangement is used to realize the first transflective optical element and the second optical element so as to realize transmission and reflection.

[0010] Preferably, the first transflective optical element is a first polarizing element, which includes a first quarter-wave plate and a first polarization splitter film, and the first quarter-wave plate is farther away from the light source than the first polarizing element; the second transflective optical element is a second polarizing element, which includes a second quarter-wave plate and a second polarization splitter film, and the second quarter-wave plate is closer to the second curved reflector than the second polarizing element.

[0011] The above arrangement enables the first transflective optical element and the second transflective optical element to achieve transmission and reflection. In addition, the use of the polarization beam splitter film and the quarter-wave plate can effectively improve the utilization rate of the light emitted by the light source and reduce the loss of light in the desktop optical system.

[0012] Preferably, the desktop optical system further comprises a lens, and the lens is disposed between the light source and the first optical processing part. The light emitted by the light source is first transmitted through the lens and then emitted to the first optical processing part.

[0013] The lenses are arranged to correct the aberrations of the desktop optical system.

[0014] Preferably, the light emitted by the light source is emitted toward the first optical processing part, and after being sequentially transmitted by the first transflective optical element, reflected by the first curved reflector, and reflected by the first transflective optical element, is emitted toward the second optical processing part. The light entering the second optical processing part is sequentially reflected by the second transflective optical element, reflected by the second curved reflector, and transmitted by the second transflective optical element, and is emitted toward the exit pupil position to form an image with a preset focal plane depth.

[0015] Preferably, the focal depth of the image formed at the exit pupil ranges from -100000 mm to +1000 mm.

[0016] Preferably, the focal length of the second curved reflector ranges from 135 mm to 175 mm.

[0017] Preferably, the focal length of the first curved reflector ranges from 55 mm to 95 mm.

[0018] Preferably, the exit pupil diameter of the desktop optical system is at least larger than 100 mm×60 mm.

[0019] Preferably, the overall focal length range of the desktop optical system is 50 mm to 115 mm.

[0020] Compared with the prior art, the utility model performs secondary imaging through two optical processing parts arranged in sequence, thereby performing secondary amplification of the image, and finally makes the image displayed by the light source have a larger field of view after passing through the two optical processing parts. A larger field of view is very friendly to myopic people. Since myopic people themselves cannot see distant objects clearly, they prefer to watch nearby things. If they watch nearby things for a long time, the degree of myopia will be deepened to a certain extent. The technical solution involved in the utility model can "magnify" distant objects to keep myopic people able to clearly watch the corresponding pictures, which will effectively prevent the deepening of myopia and also bring better visual experience to the viewer. Furthermore, through the quarter-wave plate and the polarization splitter film, the loss of light can be reduced while satisfying the function of the transflective optical element, so that the image finally formed by the desktop optical element still maintains a certain brightness. Further, the lens is set to correct the aberration of the desktop optical system to ensure the image quality finally viewed by the viewer. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the optical path structure of the desktop optical system in the embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the optical path structure of a desktop optical system in one embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the optical path structure of a desktop optical system in another embodiment of the utility model;

[0025] Figure 4 The figure is a schematic diagram of the optical path structure of a desktop optical system in another embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] This embodiment provides a desktop optical system, such as Figure 1-Figure 4 shown.

[0031] like Figure 1 As shown, the desktop optical system includes a light source 6, a first optical processing unit and a second optical processing unit.

[0032] The light source 6 is used to emit light to provide a light source for the desktop optical system. Exemplarily, the light source 6 can be a display.

[0033] The first optical processing unit is arranged opposite to the light source 6 to receive the light emitted from the light source 6. The first optical processing unit includes a first light splitting unit and a first curved reflector 5.

[0034] The first transflective optical element 4, as the name implies, can achieve transmission and reflection at the same time, that is, when light is incident on the first transflective optical element 4, part of the light can be emitted in the form of transmission, and part of the light can be emitted in the form of reflection.

[0035] Exemplarily, the first transflective optical element 4 may be a plane beam splitter, and the ratio of light transmitted and reflected after the light is incident on the plane beam splitter is determined by the splitting ratio of the plane beam splitter. For example, when the splitting ratio of the plane beam splitter is 1:1, 50% of the light incident on a certain surface of the plane beam splitter is refracted and emitted, and the remaining 50% of the light is reflected and emitted.

[0036] The first transflective optical element 4 is arranged opposite to the light source 6, so that the light emitted by the light source 6 can be incident on the first transflective optical element 4. After passing through the first transflective optical element 4, the light is divided into two paths and emitted. One path is emitted in the form of reflection. This part of the light does not participate in the subsequent light propagation and is emitted outside the desktop optical system. This part of the light is invalid light; the other path is emitted in the form of transmission and continues to propagate in the desktop optical system. This part of the light is regarded as valid light.

[0037] The first curved reflector 5 is arranged opposite to the first transflective optical element 4. Specifically, the first curved reflector 5 is arranged on the optical path of the light reflected by the first transflective optical element 4, so that the light reflected by the first transflective optical element 4 is incident on the first curved reflector 5. The focal length range of the first curved reflector 5 is 55 mm to 95 mm.

[0038] The light reflected by the first curved reflector 5 will be emitted toward the first transflective optical element 4 again and incident on the first transflective optical element 4. After passing through the first transflective optical element 4, it will be emitted in two ways, including the light emitted by the first transflective optical element 4 in the form of reflection and the light emitted in the form of transmission. The reflected light will propagate in the desktop optical system and is effective light.

[0039] In summary, the effective light path of the light emitted by the light source 6 includes: the light emitted by the light source 6 is sequentially transmitted by the first transflective optical element 4 , reflected by the first curved reflector 5 , and reflected by the first transflective optical element 4 .

[0040] The second optical processing part is arranged opposite to the first optical processing part, that is, the second optical processing part is arranged on the propagation path of the output light of the first light propagation.

[0041] The second optical processing unit includes a second transflective optical element 2 and a second curved reflector 3 .

[0042] The properties of the second transflective optical element 2 are the same as those of the first transflective optical element 4, which will not be described in detail here. The second transflective optical element 2 is arranged opposite to the first curved reflector 5, that is, the first curved reflector 5 is arranged on the propagation path of the light reflected by the second transflective optical element 2.

[0043] The light outputted by the second transflective optical element 2 in a reflective manner is effective light.

[0044] The second curved reflector 3 is opposite to the second transflective optical element 2 and is disposed on the propagation path of the light reflected by the second transflective optical element 2, and the second curved reflector 3 reflects the light incident thereon toward the position of the second transflective optical element 2. The focal length range of the second curved reflector 3 is 135 mm to 175 mm.

[0045] After receiving the light reflected by the second curved reflector 3, the second transflective optics divides the light into two paths for emission, wherein the light output in the form of transmission is the effective light, which is emitted toward the position of the exit pupil 1 to form an image 7 with a preset focal plane.

[0046] Furthermore, to improve light utilization and reduce light energy loss, the first transflective optical element 4 and the second transflective optical element 2 may also be polarizing elements. The first transflective optical element 4 corresponds to the first polarizing element, and the second transflective optical element corresponds to the second polarizing element.

[0047] Specifically, the first polarizing element includes a first quarter wave plate and a first polarizing beam splitter film, and the first polarizing beam splitter film is closer to the light source 6 than the first quarter wave plate. The light emitted by the light source 6 includes P linear polarized light and S linear polarized light. The first polarizing beam splitter film allows the P linear polarized light to pass through and reflects the S linear polarized light. The transmitted P linear polarized light becomes right-handed circularly polarized light after passing through the first quarter wave plate. After being incident on the first curved reflector 5, the light is reflected and becomes left-handed circularly polarized light toward the first polarizing element. First, it passes through the first quarter wave plate and becomes S linear polarized light and is incident on the first polarizing beam splitter film for reflection. The S linear polarized light passes through the first quarter wave plate and becomes left-handed circularly polarized light. The second polarization element includes a second quarter wave plate close to the second curved reflector 3 and a second polarization splitter film far away from the second curved reflector 3. When left-handed circularly polarized light is incident on the second polarization element, it first passes through the second quarter wave plate and becomes S linearly polarized light. The second polarization splitter film reflects the S linearly polarized light, and outputs left-handed circularly polarized light after passing through the second quarter wave plate. After being incident on the second curved reflector 3 and reflected, the light becomes right-handed circularly polarized light and is incident on the second polarization element again. When passing through the second quarter wave plate, the light becomes P linearly polarized light. The P polarized light passes through the second polarization splitter film and is emitted to the exit pupil 1 position and forms an image 7.

[0048] Compared with the plane beam splitter, the polarization element avoids unnecessary light dispersion. Each time the light is incident on the plane beam splitter, a part of the light will be lost; but for the polarization element, only when the light source 6 is incident on the first transflective optical element 4, a part of the light does not participate in the desktop optical system, and there is no light loss in the subsequent incident and reflection. This makes the light utilization rate of the entire optical system higher and avoids unnecessary loss.

[0049] Furthermore, the desktop book optical system further comprises a lens, which is arranged between the light source 6 and the first optical processing unit, and the light emitted by the light source 6 first passes through the lens and then enters the first optical processing unit. The aberration of the desktop book optical system can be corrected by arranging the lens.

[0050] The diagonal field of view of the image 7 formed by the desktop optical system is not less than 40°, and the horizontal field of view angle is at least greater than 33°; the diameter of the exit pupil 1 is greater than 100mm×60mm; the focal plane depth range of the image 7 formed by the desktop optical system is -100000mm~+1000mm. The overall focal length range of the desktop optical system is 50mm~115mm.

[0051] A feasible implementation scheme is given below. Figure 2 As shown, the optical parameters in this scheme are shown in Table 1. The system focal length of the desktop optical system formed by this scheme is 111.7mm, the field of view angle is 41°, the diameter of the exit pupil 1 is 120mm×60mm, and the focal depth of the image 7 formed by the system is -10000mm. The "front surface" in the following table is the side of the optical element close to the exit pupil 1 position, the "back surface" is the side of the optical element away from the exit pupil 1 position, the "upper surface" is the side of the optical element facing upward, and the "lower surface" is the side of the optical element facing downward.

[0052] Table 1 Optical system parameters

[0053]

[0054]

[0055] 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 of a point on the surface. The surface constituting the aspheric 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, A i are the coefficients of the higher-order terms.

[0056] Table 2 below shows the aspheric coefficients of the front surface of the first curved reflector 5 .

[0057] Table 2 Aspheric coefficients

[0058]

[0059] Another feasible implementation scheme is given below. Figure 3 As shown, the optical parameters in this scheme are shown in Table 3. The system focal length of the desktop optical system formed by this scheme is 96.0mm, the field of view angle is 41°, the diameter of the exit pupil 1 is 120mm×60mm, and the focal depth of the image 7 formed by the system is -10000mm. The "front surface" in the following table is the side of the optical element close to the exit pupil 1 position, the "back surface" is the side of the optical element away from the exit pupil 1 position, the "upper surface" is the side of the optical element facing upward, and the "lower surface" is the side of the optical element facing downward.

[0060] Table 3 Optical system parameters

[0061]

[0062]

[0063] 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 of a point on the surface. The surface constituting the aspheric 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, A i are the coefficients of the higher-order terms.

[0064] Table 4 below shows the aspheric coefficients of the front surface of the second curved reflector 3 and the front surface of the first curved reflector 5 .

[0065] Table 4 Aspheric coefficients

[0066]

[0067] Another feasible implementation scheme is given below. Figure 4 As shown, the optical parameters in this scheme are shown in Table 3. The system focal length of the desktop optical system formed by this scheme is 100.0mm, the field angle is 41°, the diameter of the exit pupil 1 is 120mm×60mm, and the focal depth of the image 7 formed by the system is -10000mm. The "front surface" in the following table is the side of the optical element close to the exit pupil 1 position, the "back surface" is the side of the optical element away from the exit pupil 1 position, the "upper surface" is the side of the optical element facing upward, and the "lower surface" is the side of the optical element facing downward.

[0068] Table 5 Optical system parameters

[0069]

[0070]

[0071] 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 of a point on the surface. The surface constituting the aspheric 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, A i are the coefficients of the higher-order terms.

[0072] Table 6 below shows the aspheric coefficients of the front surface of the second curved reflector 3 and the lower surface of the first curved reflector 5 .

[0073] Table 6 Aspheric coefficients

[0074]

[0075]

[0076] 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: Light source, emitting light; a first optical processing unit, arranged opposite to the light source, and receiving the light emitted from the light source; the first optical processing unit comprises a first transflective optical element and a first curved reflector, the first transflective optical element being arranged on the propagation path of the light emitted from the light source, the first curved reflector being arranged opposite to the first transflective optical element, and receiving the light transmitted through the first transflective optical element, and the first transflective optical element being arranged on the propagation path of the light reflected by the first curved reflector; The second optical processing unit is arranged opposite to the first optical processing unit, and receives the output light from the first optical processing unit. The second optical processing unit includes a second transflective optical element and a second curved reflector. The second transflective optical element is arranged on the propagation path of the light reflected by the first transflective optical element; the second curved reflective optical element is arranged opposite to the second transflective optical element, and receives the light transmitted by the second transflective optical element, and the second transflective optical element is arranged on the propagation path of the light reflected by the second curved reflector.

2. The desktop optical system according to claim 1, characterized in that: The first transflective optical element is a plane beam splitter, and the second transflective optical element is a plane beam splitter.

3. The desktop optical system according to claim 1, characterized in that: The first transflective optical element is a first polarizing element, which includes a first quarter-wave plate and a first polarization splitter film, and the first quarter-wave plate is farther away from the light source than the first polarizing element; the second transflective optical element is a second polarizing element, which includes a second quarter-wave plate and a second polarization splitter film, and the second quarter-wave plate is closer to the second curved reflector than the second polarizing element.

4. The desktop optical system according to claim 1, characterized in that: The desktop optical system further comprises a lens, which is arranged between the light source and the first optical processing part. The light emitted by the light source is first transmitted through the lens and then emitted to the first optical processing part.

5. The desktop optical system according to claim 1, characterized in that: The light emitted by the light source is emitted toward the first optical processing part, and after being sequentially transmitted by the first transflective optical element, reflected by the first curved reflector, and reflected by the first transflective optical element, is emitted toward the second optical processing part. The light entering the second optical processing part is sequentially reflected by the second transflective optical element, reflected by the second curved reflector, and transmitted by the second transflective optical element, and is emitted toward the exit pupil position to form an image with a preset focal plane depth.

6. The desktop optical system according to claim 5, characterized in that: The focal depth of the image formed at the exit pupil ranges from -100,000 mm to +1000 mm.

7. The desktop optical system according to claim 1, characterized in that: The focal length of the second curved reflector ranges from 135 mm to 175 mm.

8. The desktop optical system according to claim 1, wherein: The focal length of the first curved reflector ranges from 55 mm to 95 mm.

9. The desktop optical system according to claim 1, characterized in that: The exit pupil diameter of the desktop optical system is at least greater than 100 mm×60 mm.

10. The desktop optical system according to claim 1, wherein: The overall focal length range of the desktop optical system is 50 mm to 115 mm.

Images