Desktop far image read-write device

Abstract

The utility model discloses a desktop remote image read-write device, which comprises a support, a plane spectroscope and a concave reflector. Wherein the concave reflecting mirror is fixedly arranged on the bracket; the concave reflecting mirror is perpendicular to the visual axis and is arranged at a position far away from human eyes; the plane spectroscope is obliquely arranged close to human eyes, and the included angle between the plane spectroscope and the visual axis ranges from 30 degrees to 60 degrees. Light reflected by the desktop and an object placed on the desktop is emitted to the plane spectroscope from the lower part, is reflected by the plane spectroscope, is emitted to the concave reflector, is reflected by the concave reflector, penetrates through the plane spectroscope, is emitted to an exit pupil position, and is imaged at a position not less than 3 meters. Compared with an off-axis imaging remote lens, the desktop remote image read-write device based on the coaxial Birdbath optical system design has the advantages that a far image which is almost free of distortion and high in definition can be obtained under the condition that a free-form surface is not introduced, meanwhile, the difficulty of machining, assembling and adjusting is reduced, the structure is more stable, and the imaging effect is easier to guarantee.

Description

Technical Field

[0001] The utility model relates to a desktop tele-image reading and writing device. Background Art

[0002] At present, the myopia problem among teenagers is becoming increasingly serious. The fundamental reason is that teenagers' eyes focus on a relatively close range most of the time. In order to adapt to close-range imaging, the eye axis gradually becomes longer. In order to solve this problem, various myopia prevention and control products have emerged on the market.

[0003] The zoom lens is one of the many existing myopia prevention and control devices. It mostly uses two free-form surface reflectors to fold the light path, increasing the optical path, and can display closer objects farther away, inhibiting the extension of the viewer's eye axis, achieving the purpose of myopia prevention and control. However, this method also has some problems. Due to the introduction of off-axis optics, asymmetric distortion is introduced. At the same time, it is difficult to ensure the accuracy of the surface shape due to the limitations of large-aperture free-form surface reflective lens processing technology, resulting in a decrease in imaging clarity and an aggravation of the pupil swim phenomenon. These problems have led to a decrease in user experience. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a desktop telescopic image reading and writing device using a coaxial optical system.

[0005] In order to achieve the above technical objectives, the utility model adopts the following technical solutions:

[0006] A desktop telescopic reading and writing device comprises: a bracket, a plane beam splitter and a concave reflector; wherein:

[0007] The concave reflecting mirror is fixedly arranged on the bracket;

[0008] The concave reflector is arranged perpendicular to the visual axis and at a position far away from the human eye;

[0009] The top of the plane beam splitter is connected to the top of the concave reflector; the plane beam splitter is arranged to be tilted close to the human eye, and the angle between the plane beam splitter and the visual axis is between 30° and 60°;

[0010] The light reflected by the table top and the object placed on the table top is emitted from below to the plane beam splitter, and is reflected by the plane beam splitter and then emitted to the concave reflector, and then is reflected by the concave reflector and passes through the plane beam splitter to the exit pupil position, and forms an image at a position not less than 3 meters.

[0011] Preferably, a light shield is further included, which is arranged above the plane beam splitter, and one side of the light shield is connected to the top of the concave reflector.

[0012] Preferably, the light shield and the plane beam splitter can be rotated to a folded state in a direction close to the concave reflecting mirror.

[0013] Preferably, the light shield comprises a light shielding plate and a folded edge extending in the direction of the plane beam splitter, and the area of ​​the light shielding plate is larger than the area of ​​the plane beam splitter and larger than the area of ​​the concave reflector.

[0014] Preferably, a fixing seat is provided on the top of the concave reflector, and the fixing seat is provided with two parallel axial holes, which are respectively used for rotationally connecting with the connecting piece of the light shield and the connecting piece of the plane beam splitter.

[0015] Preferably, the connecting piece of the light shield is connected to the axial hole of the fixing seat at the rear side, and, in the folded state, the upper folded edge of the light shield is higher than the top of the plane beam splitter.

[0016] Preferably, the surface of the concave reflector is coated with a total reflection film; the radius of curvature of the concave reflector ranges from 400 mm to 600 mm.

[0017] Preferably, the plane beam splitter is provided with a polarization beam splitting film; and a quarter wave plate is provided between the plane beam splitter and the concave reflector.

[0018] Preferably, the exit pupil distance is between 150 mm and 300 mm, the exit pupil aperture is not less than φ60 mm, and the field of view angle is not less than 35° and not more than 42°.

[0019] Preferably, the bracket is telescopically adjustable.

[0020] Preferably, it further comprises a book placing platform which is independently arranged or detachably connected to the bracket; the upper surface of the book placing platform is arranged horizontally or inclined.

[0021] The desktop telescopic reading and writing device provided by the utility model is based on the coaxial birdbath optical system design, and can magnify and project objects such as books placed on the desktop to achieve an imaging effect similar to that of a telescope. Compared with the off-axis imaging telescope, this structure can obtain a telescopic picture with almost no distortion and high definition without introducing a free-form surface, and at the same time reduce the difficulty of processing and adjustment, the structure is more stable, and the imaging effect is easier to ensure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the desktop telephoto reading and writing device in the open state;

[0023] Figure 2 is a schematic diagram of a desktop telescopic reading and writing device in a folded state;

[0024] Figure 3 It is a schematic diagram of the optical path of a desktop telephoto reading and writing device;

[0025] Figure 4 It is a schematic diagram of the connection structure of the sunshade and the reflector;

[0026] Figure 5 It is a schematic diagram of the connection structure of the plane beam splitter and the concave reflector;

[0027] Figure 6 It is a three-dimensional structural diagram of a desktop telescopic reading and writing device. DETAILED DESCRIPTION

[0028] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0029] The utility model aims to provide a desktop telephoto reading and writing device with a coaxial optical system, which can achieve the effect of zooming out the desktop image, similar to the function of a telescope. Figure 1 , Figure 2 As shown, the desktop telescopic reading and writing device comprises: a bracket 1, a concave reflector 2, a plane beam splitter 3 and a light shield 4; wherein the concave reflector 2 is fixedly arranged on the bracket 1; the concave reflector 2 is arranged perpendicular to the visual axis and at a position far away from the human eye; the top of the plane beam splitter 3 is connected to the top of the concave reflector 2, the plane beam splitter 3 is tilted close to the human eye, and the angle between the plane beam splitter 3 and the visual axis is between 30° and 60°; the light shield 4 is arranged above the plane beam splitter 3, and one side of the light shield 4 is connected to the top of the concave reflector 2; wherein the concave reflector 2 and the plane beam splitter 3 constitute a Birdbath (abbreviated as BB) optical system, which belongs to a coaxial optical system.

[0030] The optical path principle of the desktop telephoto reading and writing device is as follows Figure 3 As shown, the light reflected by the desktop 5 (and the object placed on the desktop 5, such as a book) is emitted toward the plane beam splitter 3 from below, and part of the light is reflected by the plane beam splitter 3 and emitted toward the concave reflector 2, and then after being reflected by the concave reflector 2, part of the light passes through the plane beam splitter 3 and is emitted toward the exit pupil position, and forms an enlarged virtual image at a position not less than 3 meters.

[0031] In the desktop telephoto reading and writing device, the plane beam splitter 3 is placed at a predetermined angle with the visual axis, and the angle range is 30° to 60°. Preferably, the best display effect is achieved when the angle is 45°. The plane beam splitter 3 is used to split the light emitted from below, so that the light reflected by the plane beam splitter 3 is emitted to the concave reflector 2, and the plane beam splitter 3 is also used to split the light reflected back from the concave reflector 2, so that part of the light passes through the plane beam splitter 3 and is emitted to the exit pupil position. The plane beam splitter 3 is attached with a film with a predetermined transmission-reflection ratio. Preferably, a beam splitter film with a transmission-reflection ratio of 5:5 is used.

[0032] The concave reflector 2 is arranged on the propagation path of the light reflected by the plane beam splitter 3, and is used to reflect the part of the light back to the plane beam splitter 3. The concave reflector 2 is concave toward the plane beam splitter 3. The curvature radius of the concave reflector 2 ranges from 400 mm to 600 mm, and the surface type of the concave reflector 2 is spherical, aspherical or free-form. A total reflection film or a beam splitter film with a predetermined transmission-reflection ratio is attached to the concave reflector 2. When the concave reflector 2 is provided with a total reflection film, the desktop telescopic reading and writing device can realize a display similar to a virtual reality type; when the concave reflector 2 is provided with a beam splitter film with a predetermined transmission-reflection ratio, the desktop telescopic reading and writing device can realize an augmented reality type display of optical perspective, and the ambient light can enter the human eye through the first concave reflector 2 and the plane beam splitter 3.

[0033] In order to increase the brightness of the virtual image, a polarizing element can be added to the BB optical path to improve the utilization rate of the light reflected by the desktop 5 and emitted to the plane beam splitter 3; a polarizing beam splitter film is arranged on the surface of the plane beam splitter 3, and a quarter-wave plate is arranged between the plane beam splitter 3 and the concave reflector 2, so as to change the polarization state of the light reflected by the plane beam splitter 3, so that it can pass through the plane beam splitter 3 and emit to the exit pupil position. For example, the light emitted from the desktop to the plane beam splitter 3 is divided into two parts: p-type polarized light and s-type polarized light, wherein the s-type polarized light is reflected by the plane beam splitter 3 to the concave reflector 2, and in the process of the s-type polarized light being emitted from the plane beam splitter 3 to the concave reflector 2 and reflected back to the plane beam splitter 3, the polarization direction of the light changes twice and becomes p-type polarized light, so that it passes through the plane beam splitter 3 and emits to the human eye.

[0034] The light shield 4 is arranged above the plane beam splitter 3. The function of the light shield 4 is to shield the light emitted from the upper side (and both sides) to the plane beam splitter 3. At the same time, the light shield 4 has a diffuse reflection effect on the light emitted from the bottom to the plane beam splitter 3 and passing through the plane beam splitter 3, thereby reducing stray light. It can be understood that the setting of the light shield 4 is not necessary. In combination with the setting of the house light source, the light shield 4 can be omitted.

[0035] The above-mentioned desktop telescopic reading and writing device can achieve a large exit pupil distance, which is between 150mm and 300mm, the exit pupil diameter is not less than φ60mm, the field of view angle is not less than 35° and not more than 42°, and the exit pupil distance, exit pupil diameter and virtual image distance are all relatively large.

[0036] The following is combined with Figure 1 , Figure 2 , Figure 4 and Figure 5 , the structure of the desktop telescopic reading and writing device provided by the utility model is specifically introduced.

[0037] like Figure 1 and Figure 2 As shown, the bracket 1 is set on the desktop 5, and the bracket 1 uses a telescopic bracket, so that the height position of the concave reflector 2 and other components fixed on the top of the bracket 1 can be adjusted.

[0038] A fixing portion 21 is provided on the back of the concave reflector 2, and the fixing portion 21 is fixedly connected to the top of the bracket 1. A fixing seat 22 is provided on the top of the concave reflector 2, and the fixing seat 22 is provided with two parallel axial holes, which are respectively used to be rotatably connected with the connecting piece 41 of the light shield 4 and the connecting piece 31 of the plane beam splitter 3, so as to realize the rotation of the plane beam splitter 3 and the light shield 4 relative to the concave reflector 2. The light shield 4 and the plane beam splitter 3 can be rotated to a folded state in a direction close to the concave reflector 2, and can be rotated to a use state relative to the concave reflector 2 in a direction away from the concave reflector 2. The above-mentioned reading and writing device can be opened when in use, and can be folded and stored when not in use.

[0039] like Figure 4 and Figure 5 As shown, the light shield 4 includes a light shielding plate and a folded edge extending toward the plane beam splitter 3, and the area of ​​the light shielding plate 4 is larger than the area of ​​the plane beam splitter 3 and larger than the area of ​​the concave reflector 2. Thus, in the folded state, the light shield 4 can completely cover the plane beam splitter 3 and the concave reflector 2, so that the optical element is placed inside the light shield 4, and the light shield 4 acts as a protective cover.

[0040] The connecting piece 31 of the plane beam splitter 3 is connected to the axial hole of the fixing seat 22 at the front side, and the connecting piece 41 of the light shield 4 is connected to the axial hole of the fixing seat 22 at the rear side. Preferably, the connecting piece 41 of the light shield 4 is inclined relative to the upper folding edge of the light shield 4 to ensure that the upper folding edge of the light shield 4 is higher than the top of the plane beam splitter 3 when in the folded state.

[0041] In order to facilitate image acquisition of the reading and writing device, the book is located below the plane beam splitter 3. Preferably, the desktop telescopic reading and writing device also includes a book placement platform 6 that is independently set or detachably connected to the bracket 1; the upper surface of the book placement platform 6 is set horizontally or inclined.

[0042] In summary, the desktop telephoto reading and writing device provided by the utility model is based on the coaxial birdbath optical system design. Compared with the off-axis imaging telescope, this structure can obtain a telephoto picture with almost no distortion and high definition without introducing a free-form surface, while reducing the difficulty of processing and adjustment, making the structure more stable and the imaging effect easier to ensure. In addition, the above structure makes it easier to realize the folding of the optical system, and after opening, the optical system can be kept in a stable imaging state, and the user experience is more friendly.

[0043] The above is a detailed description of a desktop telescopic reading and writing device provided by the utility model. For those skilled in the art, any obvious changes made to it without departing from the essence of the utility model will constitute an infringement of the patent right of the utility model and will bear corresponding legal responsibilities.

Claims

1. A desktop telescopic reading and writing device, characterized in that: include: bracket, a plane beam splitter and a concave reflector; wherein, The concave reflecting mirror is fixedly arranged on the bracket; The concave reflector is arranged perpendicular to the visual axis and at a position far away from the human eye; The top of the plane beam splitter is connected to the top of the concave reflector; the plane beam splitter is arranged to be tilted close to the human eye, and the angle between the plane beam splitter and the visual axis is between 30° and 60°; The light reflected by the table top and the object placed on the table top is emitted from below to the plane beam splitter, and is reflected by the plane beam splitter and then emitted to the concave reflector, and then is reflected by the concave reflector and passes through the plane beam splitter to the exit pupil position, and forms an image at a position not less than 3 meters.

2. The desktop telescopic reading and writing device according to claim 1, characterized in that: The plane beam splitter can be rotated to a folded state in a direction close to the concave reflecting mirror.

3. The desktop telescopic reading and writing device according to claim 1, characterized in that: The invention also comprises a light shield which is arranged above the plane beam splitter, and one side of the light shield is connected to the top of the concave reflector.

4. The desktop telescopic reading and writing device according to claim 2, characterized in that: It also includes a light shield, which is arranged above the plane beam splitter, and one side of the light shield is connected to the top of the concave reflector; the light shield can be rotated to a folded state in a direction close to the concave reflector.

5. The desktop telescopic reading and writing device according to claim 4, characterized in that: The light shield comprises a light shielding plate and a folded edge extending toward the plane beam splitter, and the area of ​​the light shielding plate is larger than the area of ​​the plane beam splitter and larger than the area of ​​the concave reflector.

6. The desktop telescopic reading and writing device according to claim 4, characterized in that: A fixing seat is arranged on the top of the concave reflector. The fixing seat is provided with two parallel axial holes, which are respectively used for rotationally connecting with the connecting piece of the light shield and the connecting piece of the plane beam splitter.

7. The desktop telescopic reading and writing device according to claim 6, characterized in that: The connecting piece of the light shield is connected to the shaft hole of the fixing seat at the rear side, and in the folded state, the upper folded edge of the light shield is higher than the top of the plane beam splitter.

8. The desktop telescopic reading and writing device according to claim 1 or 3, characterized in that: The surface of the concave reflector is coated with a total reflection film; The plane beam splitter is provided with a polarization beam splitting film; A quarter wave plate is arranged between the plane beam splitter and the concave reflecting mirror.

9. The desktop telescopic reading and writing device according to claim 1 or 3, characterized in that: The bracket is telescopically adjustable.

10. The desktop telescopic reading and writing device according to claim 1 or 3, characterized in that: It also includes a book placement platform which is independently arranged or detachably connected to the bracket; the upper surface of the book placement platform is arranged horizontally or inclined.

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