Desktop far image read-write device and information display method

Abstract

The invention discloses a desktop remote image read-write device and an information display method wherein the desktop remote image read-write device comprises a remote image optical system, a distance sensor, a controller and a display device; a distance d from the bottom of desktop remote image read-write equipment to a desktop or an object placed on the desktop is collected in real time through a distance sensor, the virtual image distance l'of a remote image light path is obtained, if a defocus light path exists, the defocus degree D of the defocus light path is obtained at the same time, and then the virtual image distance l 'and the defocus degree D are displayed outwards through display equipment. According to the desktop remote image read-write device, the distance sensor and the small display device are additionally arranged in the desktop remote image read-write device, the real-time display function of the virtual image distance and the defocusing degree is added, and therefore the problem that an existing desktop remote image read-write device cannot visually and accurately reflect the virtual image distance and the defocusing degree is solved.

Description

Technical Field

[0001] The invention relates to a desktop telescopic image reading and writing device and also to an information display method of the desktop telescopic 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] Among them, desktop telephoto reading and writing devices are devices that use optical means to zoom out close-range reading and writing to distant imaging, and are mostly used in the field of myopia prevention and control for teenagers. Desktop telephoto reading and writing devices are generally used for teenagers and children. In order to adapt to users of different heights, they are generally equipped with adjustable height brackets. However, when adjusting the height of the bracket, the distance from each optical element in the desktop telephoto reading and writing device to the desktop will change, which will cause the virtual image distance of the desktop telephoto reading and writing device to change at the same time.

[0004] For users who use desktop telephoto reading and writing devices for myopia management purposes, the virtual image distance of the desktop telephoto reading and writing devices with a single focal plane, as well as the virtual image distance and defocus of the desktop telephoto reading and writing devices in the telephoto solution with a defocus optical path, are closely related to the myopia prevention and control effect and the user experience comfort. They are relatively important indicators that are closely followed by users. However, there is currently no display method that is simple and intuitive and can accurately reflect the changes in indicators such as virtual image distance and defocus. Summary of the invention

[0005] The primary technical problem to be solved by the present invention is to provide a desktop telescopic reading and writing device for monitoring and displaying the indexes of an optical system.

[0006] Another technical problem to be solved by the present invention is to provide an information display method for a desktop telescopic reading and writing device.

[0007] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] According to a first aspect of the present invention, there is provided a desktop telescopic reading and writing device, comprising a telescopic optical system, a distance sensor, a controller and a display device;

[0009] The telescopic optical system includes a plane beam splitter and a first concave reflector, and the light reflected by the table and the object placed on the table is directed to the plane beam splitter from below, and is split at the position of the plane beam splitter to form a first light, and then the first light is reflected by the first concave reflector, and is split by the plane beam splitter, and then is directed to the exit pupil position, and forms a virtual image at a position at least three meters in front of the exit pupil position;

[0010] A distance sensor is used to collect the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop;

[0011] The controller obtains the virtual image distance l' of the telephoto optical system according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop, and displays the virtual image distance l' through the display device.

[0012] Preferably, the telescopic optical system further comprises a second concave reflector, and the light reflected by the desktop and the object placed on the desktop is directed to the plane beam splitter from below, and is split at the position of the plane beam splitter to form a second light, and then the second light is reflected by the second concave reflector, and is split again by the plane beam splitter, and then is directed to the exit pupil position to form a defocused image;

[0013] The controller obtains the defocus degree D corresponding to the image distance of the defocused image according to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or an object placed on the desktop, and displays the defocus degree D through the display device.

[0014] According to a second aspect of the present invention, there is provided an information display method for a desktop telescopic reading and writing device, comprising the following steps:

[0015] The distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop is collected by a distance sensor;

[0016] The controller obtains a virtual image distance l' corresponding to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop;

[0017] The controller determines whether the current virtual image distance has changed compared with the previously displayed virtual image distance; if so, updates the virtual image distance and lights up the display device for display; if not, keeps the display device off.

[0018] Preferably, the controller calculates the object distance of the first concave reflector according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or an object placed on the desktop, and calculates the current virtual image distance in combination with the equivalent radius of curvature of the first concave reflector and the distance from the first concave reflector to the exit pupil position. The virtual image distance is calculated using the following formula:

[0019]

[0020] In the formula, all units are m;

[0021] l'——virtual image distance;

[0022] d——The distance between the lower edge of the desktop telephoto reading and writing device and the desktop or objects placed on the desktop;

[0023] s1——the equivalent distance from the first concave reflector to the lower edge of the desktop telescopic reading and writing device, s1=δ1+δ2;

[0024] R1——the equivalent radius of curvature of the first concave reflector;

[0025] s2——equivalent distance from the first concave reflector to the exit pupil position, s2=δ1+δ4.

[0026] Preferably, the controller obtains the virtual image distance l' corresponding to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop by data search from a pre-stored mapping table of the distance d and the virtual image distance l'.

[0027] Preferably, the controller obtains a defocus degree D corresponding to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop according to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop;

[0028] The controller determines whether the current defocus degree has changed compared with the previously displayed defocus degree; if so, updates the defocus degree and displays it after lighting up the display device; if not, keeps the display device off.

[0029] Preferably, the object distance of the second concave reflector is calculated according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop, and the defocus degree corresponding to the current defocused image is calculated in combination with the equivalent curvature radius of the second concave reflector and the distance from the second concave reflector to the exit pupil position; the controller calculates the defocus degree according to the following expression:

[0030]

[0031] In the formula, all units are m;

[0032] D——defocus;

[0033] R2——the equivalent radius of curvature of the second concave reflector;

[0034] s3——the equivalent distance from the second concave reflector to the lower edge of the desktop telescopic reading and writing device, s3=δ2+δ3;

[0035] s4——The equivalent distance from the second concave reflector to the exit pupil position, s4=δ3+δ4.

[0036] Preferably, the controller obtains the defocus D corresponding to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop through data search from a pre-stored mapping table of distance d and defocus D based on the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop.

[0037] Preferably, the display device is controlled by the controller, and the screen is turned on for a short time for display only after the values ​​of the virtual image distance l' and / or the defocus degree D are updated, and is in a screen-off state at other times.

[0038] According to a third aspect of the present invention, there is provided an information display method for a desktop telescopic reading and writing device, comprising the following steps:

[0039] The distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop is collected by a distance sensor;

[0040] Determine whether the current distance d has changed compared to the previously stored distance;

[0041] If yes, the current virtual image distance l' and / or defocus degree D is obtained, and after the virtual image distance l' and / or defocus degree are updated, the display device D is turned on for display; if no, the display device is kept off.

[0042] The desktop telephoto reading and writing device provided by the present invention includes a telephoto optical system, a distance sensor, a controller and a display device; the distance from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop is collected in real time by the distance sensor to obtain the virtual image distance of the telephoto optical path, and if there is a defocused optical path, the defocus degree of the defocused optical path can be obtained at the same time, and then the virtual image distance and the defocus degree are displayed to the outside through the display device. By adding a distance sensor and a small display device to the desktop telephoto reading and writing device, the real-time display function of the virtual image distance and the defocus degree is added, thereby solving the problem that the current desktop telephoto reading and writing device cannot intuitively and accurately reflect the changes in the virtual image distance and the defocus degree of the telephoto optical system, and the method of obtaining the virtual image distance and the defocus degree and displaying them after collecting the distance data in real time provides a basis for the user to adjust the desktop telephoto reading and writing device to a suitable height. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a principle diagram of the optical path of the desktop telescopic reading and writing device provided in Example 1 of the present invention;

[0044] Figure 2 It is a schematic diagram of the electronic control part of the desktop telescopic reading and writing device;

[0045] Figure 3 It is a schematic diagram of the structure of a desktop tele-image reading and writing device;

[0046] Figure 4 It is a parameter diagram of the desktop telescopic reading and writing device provided in Example 1 of the present invention;

[0047] Figure 5 The process of the information display method of the desktop telescopic reading and writing device Figure 1 ;

[0048] Figure 6 The process of the information display method of the desktop telescopic reading and writing device Figure 2 ;

[0049] Figure 7 It is an optical path principle diagram and parameter schematic diagram of a desktop telescopic reading and writing device provided in Embodiment 2 of the present invention;

[0050] Figure 8 It is a light path principle diagram and parameter schematic diagram of the desktop telescopic reading and writing device provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0054] The present application provides a desktop telephoto reading and writing device based on a coaxial optical system, including a telephoto optical system, wherein the telephoto optical system may include only a telephoto optical path, or may include both a telephoto optical path and a defocus optical path. Below, in a first embodiment, a desktop telephoto reading and writing device with a defocus prevention and control function including a defocus optical path and a telephoto optical path is described, and in a second embodiment, a desktop telephoto reading and writing device including only a telephoto optical path is described.

[0055] First embodiment

[0056] The first embodiment provides a desktop telescopic reading and writing device 10 with a defocus prevention and control function.

[0057] like Figure 1 As shown, the defocus protection desktop telephoto reading and writing device is implemented based on the Birdbath (BB for short) optical path, including two BB optical paths, the two BB optical paths share a plane beam splitter 3, and the light 5 reflected by the desktop 4 (and the object placed on the desktop 4, such as a book) is emitted from the bottom to the plane beam splitter 3 and is split at the position of the plane beam splitter 3; the first light (illustrated as the light 51 reflected by the plane beam splitter 3) formed after the plane beam splitter 3 is split, is reflected by the first concave reflector 1, and then passes through the plane beam splitter 3 and is emitted to the exit pupil position; the second light (illustrated as the light 52 passing through the plane beam splitter 3) formed after the plane beam splitter 3 is split, is reflected by the second concave reflector 2, and is reflected again by the plane beam splitter 3 and is emitted to the exit pupil position; the first light and the second light form different optical paths respectively, and the light in the two optical paths forms images in the human eye respectively, and each optical path has an independent focal plane, and the positions of the two focal planes are different.

[0058] Among them, the first light ray emitted to the exit pupil position after being reflected by the first concave reflector 1 is formed at a virtual image position not less than 3 meters away from the exit pupil position in front of the human eye (i.e. in front of the exit pupil position) for normal viewing by the human eye. At this time, the light is formed on the retina of the human eye after entering the human eye, and the light path corresponding to the first concave reflector 1 is the far image light path; and the second light ray emitted to the exit pupil position after being reflected by the second concave reflector 2 forms a defocused image on the side opposite to the aforementioned virtual image position (i.e. behind the exit pupil position) relative to the exit pupil position, forming a positive defocus light path. The visual acuity corresponding to the positive defocus light path can be controlled between +1D and +5D. The light in the positive defocus light path is formed in front of the retina of the human eye after entering the human eye, presenting a myopic defocus state, thereby achieving defocus stimulation, which is helpful for myopia prevention and control.

[0059] In order to make the focal plane positions of the two optical paths different, the first concave reflecting mirror 1 and the second concave reflecting mirror 2 can have the same surface parameters but different distances from the plane beam splitter 3, or the first concave reflecting mirror 1 and the second concave reflecting mirror 2 can have the same distances from the plane beam splitter 3 but different equivalent radii of curvature of the first concave reflecting mirror 1 and the second concave reflecting mirror 2. The method of realizing telephoto imaging and positive defocus imaging of the two optical paths is not limited here.

[0060] In the above embodiment, the first concave reflector 1 for telephoto imaging is vertically arranged, and the light reflected by the plane beam splitter 3 is directed toward the first concave reflector 1, and the second concave reflector 2 for defocused imaging is horizontally arranged, and the light transmitted through the plane beam splitter 3 is directed toward the second concave reflector 2; it can be understood that in other embodiments, the first concave reflector 1 can also be horizontally arranged, and the second concave reflector 2 can be vertically arranged.

[0061] like Figure 2 and Figure 3 As shown, the desktop telescopic reading and writing device 10 is set on the desktop 4 through the bracket 15, and the position of the desktop telescopic reading and writing device 10 relative to the desktop 4 is adjustable. Figure 1 From the imaging principle shown, it can be seen that when the desktop telephoto reading and writing device 10 moves up and down relative to the desktop 4, the object distance between the first concave reflector 1 and the second concave reflector 2 changes, thereby affecting the virtual image distance l' of the telephoto optical path and the defocus degree D of the defocus optical path.

[0062] In order to measure the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop, a distance sensor 20 is arranged at the bottom of the desktop telescopic reading and writing device 10, and a display device 30 is arranged on the desktop telescopic reading and writing device 10. The distance sensor 20 and the display device 30 are respectively connected to a controller 40 arranged inside the desktop telescopic reading and writing device 10.

[0063] The distance sensor 20 is arranged at the bottom of the desktop telescopic reading and writing device 10, which can be specifically the lower edge of the shell, and is used to measure the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop. When an object (such as a book) is placed on the desktop 4, the distance sensor 20 measures the distance between the desktop telescopic reading and writing device 10 and the object placed on the desktop. When there is no object on the desktop, the distance sensor 20 measures the distance between the desktop telescopic reading and writing device 10 and the desktop. The distance sensor 20 can use infrared, millimeter wave, ultrasonic, laser, LED and other signals for measurement, and can measure the real-time distance between the desktop telescopic reading and writing device 10 and the desktop 4 (or a book placed on the desktop 4).

[0064] The controller 40 is configured to receive the signal collected by the distance sensor 20, and obtain the virtual image distance l' and the defocus degree D corresponding to the distance d from the desktop telephoto reading and writing device 10 to the desktop 4 or the object placed on the desktop, and display the virtual image distance l' and the defocus degree D externally through the display device 30. In actual applications, the controller 40 can obtain the virtual image distance l' and the defocus degree D by real-time calculation. Of course, it is also possible to store a mapping table of the distance d, the virtual image distance l' and the defocus degree D in the controller 40 in advance, and then, during use, obtain the virtual image distance l' and the defocus degree D corresponding to the distance d from the mapping table by data search. The above mapping table can be obtained by numerical calculation or by actual measurement.

[0065] The display device 30 uses a small-size display screen, which is generally no larger than 5 inches, for example, a 3.5-inch display screen; from the perspective of cost control, a monochrome screen or a black-and-white ink screen can be used, such as a monochrome electronic paper display screen, an industrial control screen, an LCD dot matrix screen, an LCD segment code screen, etc., and the use of the display device 30 is not restricted here. In order to prevent the display device 30 from irradiating the human eye for a long time, the display device 30 preferably has a display screen with a screen-off function. The display screen is controlled by a controller, and the screen is lit for a short time for display only after the values ​​of the virtual image distance l' and the defocus degree D are updated, and the screen can be in a screen-off state at other times.

[0066] The display device 30 is preferably arranged at the front side of the desktop telephoto reading and writing device 10, emitting light toward the exit pupil position, being independent of the telephoto optical path and the defocused optical path, and forming images in different areas of the human eye's field of view; the display device 30 can also be arranged at the rear side of the desktop telephoto reading and writing device 10 and in the area facing the exit pupil position through the plane beam splitter 3, so that the image of the display device 30 can be directly superimposed on the telephoto optical path for display, and the first concave reflector 1 and the second concave reflector 2 have no optical effect on the light emitted by the display device 30, and do not have a magnifying function for the image of the display device 30.

[0067] The controller 40 is arranged inside the desktop telescopic reading and writing device 10; as the electric control part of the desktop telescopic reading and writing device 10, it is preferred that the distance sensor 20, the display device 30 and the controller 40 are centrally arranged in the same area of ​​the desktop telescopic reading and writing device 10. Since the desktop telescopic reading and writing device 10 needs to be used in conjunction with an illumination light source, the illumination light source is usually arranged at the bottom of the desktop telescopic reading and writing device 10, and the distance sensor 20, the display device 30 and the controller 40 are arranged close to the illumination light source.

[0068] Of course, in some specially designed desktop telescopic reading and writing devices, the display device 30, the controller 40 and the distance sensor 20 can also be separately arranged. Among them, the distance sensor 20 is arranged at the lower part of the desktop telescopic reading and writing device, and the position of the distance sensor 20 relative to the first concave reflector 1 remains unchanged, and the position of the distance sensor 10 relative to the second concave reflector 2 does not change; however, the arrangement positions of the display device 30 and the controller 40 are not limited in this way, and the arrangement positions of the display device 30 and the controller 40 can be changed relative to the first concave reflector 1 and the second concave reflector 2 under different use conditions.

[0069] The above introduces the structure and optical principle of the desktop telephoto reading and writing device. Figure 4 The calculation process of the virtual image distance l' and the defocus degree D is introduced.

[0070] For the desktop telescopic reading and writing device provided by the present invention, in the process of calculating the virtual image distance l' and the defocus degree D, only the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or the object placed on the desktop is a variable, the object distance u1 of the first concave reflector 1 and the object distance u2 of the second concave reflector 2 change with the change of d, and the equivalent distance s2 from the first concave reflector 1 to the exit pupil position and the equivalent distance s4 from the second concave reflector 2 to the exit pupil position have nothing to do with the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or the object placed on the desktop, and do not change.

[0071] Specifically, the controller 40 calculates the object distance u1 of the first concave reflector 1 according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop, and calculates the virtual image distance of the telephoto optical system in combination with the equivalent curvature radius R1 of the first concave reflector 1 and the equivalent distance s2 from the first concave reflector 1 to the exit pupil position. The expression used for calculation is as follows:

[0072]

[0073] In the formula, all units are m;

[0074] l'——virtual image distance;

[0075] d——the distance between the lower edge of the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop;

[0076] s1——the equivalent distance from the first concave reflector 1 to the lower edge of the desktop telescopic reading and writing device 10;

[0077] R1——equivalent radius of curvature of the first concave reflector 1;

[0078] s2——The equivalent distance from the first concave reflector 1 to the exit pupil position.

[0079] Among them, u1 is the object distance of the first concave reflector 1, u1=d+s1; s1=δ1+δ2, δ1 is the distance from the first concave reflector 1 to the plane reflector 3, δ2 is the distance from the plane reflector 3 to the lower edge of the desktop telescopic reading and writing device 10; s2=δ1+δ4, δ1 is the distance from the first concave reflector 1 to the plane reflector 3, δ4 is the distance from the plane reflector 3 to the exit pupil position.

[0080] The controller 40 calculates the object distance u2 of the second concave reflector 2 according to the distance d from the bottom of the desktop telescopic reading and writing device 10 to the desktop 4 or an object placed on the desktop 4, and calculates the defocus degree D corresponding to the image distance of the defocused image in combination with the equivalent curvature radius R2 of the second concave reflector 2 and the equivalent distance s4 from the second concave reflector 2 to the exit pupil position, wherein the defocus degree D is the reciprocal of the image distance of the defocused optical path.

[0081] The defocus D is calculated using the following expression:

[0082]

[0083] In the formula, all units are m;

[0084] D——defocus;

[0085] R2——equivalent radius of curvature of the second concave reflecting mirror 2;

[0086] s3——equivalent distance from the second concave reflector 2 to the lower edge of the desktop telescopic reading and writing device 10;

[0087] s4——The equivalent distance from the second concave reflector 2 to the exit pupil position.

[0088] Among them, u2 is the object distance of the second concave reflector 2, u2=d+s3; s3=δ2+δ3, δ2 is the distance from the plane reflector 3 to the lower edge of the desktop telescopic reading and writing device 10, δ3 is the distance from the second concave reflector 2 to the plane reflector 3; s4=δ3+δ4, δ3 is the distance from the second concave reflector 2 to the plane reflector 3, δ4 is the distance from the plane reflector 3 to the exit pupil position.

[0089] In the above calculation process, the controller 40 collects the distance d between the lower edge of the desktop telephoto reading and writing device 10 and the desktop 4 or an object placed on the desktop, and calls the parameters R1, R2, δ1, δ2, δ3 and δ4 pre-stored in the controller to calculate the virtual image distance l' and the defocus degree D.

[0090] like Figure 5 As shown, the present invention also provides an information display method of the desktop telescopic reading and writing device 10, comprising the following steps:

[0091] S101, collecting the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop through the distance sensor 20;

[0092] S102, the controller 40 obtains the current virtual image distance l' and the current defocus D corresponding to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop.

[0093] The controller 40 can calculate the current virtual image distance l' and the current defocus D according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop, wherein the virtual image distance l' is calculated using expression (1) and the defocus D is calculated using expression (2). The controller 40 can also obtain the virtual image distance l' and the defocus D corresponding to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop from a pre-stored numerical mapping table of the distance d, the virtual image distance l' and the defocus D by means of data search according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop.

[0094] S103, determine whether the current virtual image distance l' and the current defocus degree D have changed compared with the previously stored virtual image distance and defocus degree; if yes, enter S104, update the virtual image distance l' and the defocus degree D, and light up the display device 30 for display, and then enter S105 and S106 in sequence, wherein, in S105, the display device 30 turns off the screen after displaying for a predetermined time, and S106, keeps the display device off; if not, directly enter S106 to keep the display device off.

[0095] In the above process, the virtual image distance l' and the defocus degree D are obtained in the same step. When the distance d from the bottom of the desktop telephoto reading and writing device 10 to the desktop 4 or the object placed on the desktop changes, the virtual image distance l' and the defocus degree D will change. For the desktop telephoto reading and writing device 10 that only includes the telephoto optical path, in S102 to S105, only the virtual image distance l' is obtained, compared and displayed, and the defocus degree D is not obtained, compared and displayed.

[0096] It can be understood that in order to reduce the data processing of the controller 40, the comparison step can also be placed in front, by judging whether the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop has changed compared with the previous distance, to decide whether to obtain the virtual image distance l' and the defocus degree D and whether to update and display the virtual image distance l' and the defocus degree D.

[0097] like Figure 6 As shown, the information display method of the desktop telescopic reading and writing device includes the following steps:

[0098] S201, collecting the distance d between the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop through the distance sensor 20;

[0099] S202, determine whether the current distance d has changed compared with the previous distance; if so, enter S203, obtain the virtual image distance l' and the defocus degree D. The process of obtaining the virtual image distance l' and the defocus degree D is as described above and will not be repeated here. Then enter S204, S205 and S206 in sequence, wherein, S204, updates the virtual image distance l' and the defocus degree D, and lights up the display device 30 and displays them, S205, after the display device 30 displays for a predetermined time, turns off the screen, S206, keeps the display device off the screen; if not, directly enter S206 to keep the display device off the screen.

[0100] Similarly, for a desktop telescopic image reading and writing device 10 including only a telescopic image optical path, in S203 to S205, only the acquisition and display of the virtual image distance l' is involved, and the acquisition and display of the defocus degree D is not involved.

[0101] Second embodiment

[0102] The desktop telescopic reading and writing device 10 provided in the second embodiment only includes a telescopic optical path and no defocused optical path. The other structural designs and electronic control parts of the desktop telescopic reading and writing device 10 are the same as those of the first embodiment, and only the differences between the two are introduced here.

[0103] like Figure 7 and Figure 8 As shown, the desktop telescopic reading and writing device includes a BB telescopic optical path composed of a plane beam splitter 3 and a first concave reflector 6, wherein the light 5 reflected by the desktop 4 (and an object placed on the desktop 4, such as a book) is emitted from below to the plane beam splitter 3 and is split at the position of the plane beam splitter 3; the first light ( Figure 7 The transmitted light is shown. Figure 8 The reflected light is shown as a reflection light, which is reflected by the first concave reflector 1, and then split by the plane beam splitter 3, and then directed to the exit pupil position, and forms a virtual image position at a distance of not less than 3 meters from the exit pupil position in front of the human eye (i.e., in front of the exit pupil position) for normal viewing by the human eye. At this time, the light enters the human eye and forms an image on the retina of the human eye. In the desktop telescopic reading and writing device 10, the first concave reflector 6 can be as follows: Figure 7 Set in vertical position as shown or as Figure 8 As shown, it is arranged in a horizontal position, and the arrangement position of the first concave reflecting mirror 6 does not affect the calculation of the virtual image distance l'.

[0104] The process of obtaining and displaying the virtual image distance l' of the desktop telephoto reading and writing device is the same as that of the first embodiment. The distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop is collected by the distance sensor 20. The controller 40 obtains the virtual image distance of the telephoto optical system according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop. In practical applications, the controller 40 can obtain the virtual image distance l' by real-time calculation, or a mapping table of the distance d and the virtual image distance l' can be stored in the controller 40 in advance, and then, during use, the virtual image distance l' corresponding to the distance d can be obtained from the mapping table by data search.

[0105] The controller 40 calculates the object distance u1 of the first concave reflector 6 according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or the object placed on the desktop, and calculates the virtual image distance of the telephoto optical system by combining the equivalent curvature radius R1 of the first concave reflector 6 and the equivalent distance s2 from the first concave reflector 6 to the exit pupil position. The expression used for calculation is as follows:

[0106]

[0107] In the formula, all units are m;

[0108] l'——virtual image distance;

[0109] d——the distance between the lower edge of the desktop telescopic reading and writing device 10 and the desktop 4 or an object placed on the desktop;

[0110] s1——equivalent distance from the first concave reflector 6 to the lower edge of the desktop telescopic reading and writing device 10;

[0111] R1——equivalent radius of curvature of the first concave reflecting mirror 6;

[0112] s2——equivalent distance from the first concave reflecting mirror 6 to the exit pupil position.

[0113] Among them, u1 is the object distance of the first concave reflector 6, u1=d+s1; s1=δ1+δ2, δ1 is the distance from the first concave reflector 6 to the plane reflector 3, δ2 is the distance from the plane reflector 3 to the lower edge of the desktop telescopic reading and writing device 10; s2=δ1+δ4, δ1 is the distance from the first concave reflector 6 to the plane reflector 3, δ4 is the distance from the plane reflector 3 to the exit pupil position.

[0114] In this embodiment, the display method of the desktop telescopic reading and writing device is the same as that in the above embodiment, the difference is that steps S102 to S104 only involve the calculation, comparison and display of the virtual image distance l', and in S203 and 204, only the calculation and display of the virtual image distance l' are involved. No detailed description will be given here.

[0115] In summary, the desktop telephoto reading and writing device provided by the present invention increases the real-time acquisition and display functions of the virtual image distance and the defocus degree by adding a distance sensor, a controller and a small display device to the desktop telephoto reading and writing device, thereby solving the problem that the current desktop telephoto reading and writing device cannot intuitively and accurately reflect the virtual image distance and the defocus degree of the telephoto optical system. In addition, the method of obtaining the virtual image distance and the defocus degree after real-time collection of distance data and displaying them provides a basis for the user to adjust the desktop telephoto reading and writing device to a suitable height.

[0116] The above is a detailed description of a desktop telescopic reading and writing device and information display method provided by the present invention. For those skilled in the art, any obvious changes made to it without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A method for displaying information of a desktop telescopic reading and writing device, characterized in that The steps include: The distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop is collected by a distance sensor; The controller obtains a virtual image distance l' corresponding to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop; The controller determines whether the current virtual image distance has changed compared with the previously displayed virtual image distance; if so, updates the virtual image distance and lights up the display device for display; if not, keeps the display device off.

2. The information display method of the desktop telescopic reading and writing device as claimed in claim 1, characterized in that The following steps are also included: The controller calculates the object distance of the first concave reflector according to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop, and calculates the current virtual image distance in combination with the equivalent radius of curvature of the first concave reflector and the distance from the first concave reflector to the exit pupil position. The virtual image distance is calculated using the following formula: In the formula, all units are m; l'——virtual image distance; d——The distance between the lower edge of the desktop telephoto reading and writing device and the desktop or objects placed on the desktop; s1——the equivalent distance from the first concave reflector to the lower edge of the desktop telescopic reading and writing device; R1——the equivalent radius of curvature of the first concave reflector; s2——The equivalent distance from the first concave reflector to the exit pupil position.

3. The information display method of the desktop telescopic reading and writing device as claimed in claim 1, characterized in that The following steps are also included: The controller obtains the virtual image distance l' corresponding to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop by data search from a pre-stored mapping table of the distance d and the virtual image distance l'.

4. The information display method of the desktop telescopic reading and writing device as claimed in claim 1, characterized in that The following steps are also included: The controller obtains a defocus degree D corresponding to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop according to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop; The controller determines whether the current defocus degree has changed compared with the previously displayed defocus degree; if so, updates the defocus degree and displays it after lighting up the display device; if not, keeps the display device off.

5. The information display method of the desktop telescopic reading and writing device as claimed in claim 4, characterized in that The following steps are also included: According to the distance d from the bottom of the desktop telescopic reading and writing device to the desktop or the object placed on the desktop, the object distance of the second concave reflector is calculated, and the defocus degree corresponding to the current defocused image is calculated in combination with the equivalent curvature radius of the second concave reflector and the distance from the second concave reflector to the exit pupil position; the controller calculates the defocus degree according to the following expression: In the formula, all units are m; D——defocus; R2——the equivalent radius of curvature of the second concave reflector; s3——the equivalent distance from the second concave reflector to the lower edge of the desktop telescopic reading and writing device; s4——The equivalent distance from the second concave reflector to the exit pupil position.

6. The information display method of the desktop telescopic reading and writing device as claimed in claim 4, characterized in that The following steps are also included: The controller obtains the defocus D corresponding to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or the object placed on the desktop by data search from a pre-stored mapping table of distance d and defocus D.

7. The information display method of the desktop telescopic reading and writing device as claimed in claim 1, characterized in that The following steps are also included: The display device is controlled by a controller, and only lights up the screen for a short time for display after the values ​​of the virtual image distance l' and / or the defocus degree D are updated, and is in a screen-off state at other times.

8. A desktop telescopic reading and writing device, used to implement the information display method of the desktop telescopic reading and writing device according to any one of claims 1 to 7, characterized in that: It includes a telephoto optical system, a distance sensor, a controller and a display device; The telescopic optical system includes a plane beam splitter and a first concave reflector, and the light reflected by the table and the object placed on the table is directed to the plane beam splitter from below, and is split at the position of the plane beam splitter to form a first light, and then the first light is reflected by the first concave reflector and directed to the exit pupil position through the plane beam splitter, and forms a virtual image at a position at least three meters in front of the exit pupil position; A distance sensor is used to collect the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop; The controller obtains the virtual image distance l' of the telephoto optical system according to the distance d from the bottom of the desktop telephoto reading and writing device to the desktop or an object placed on the desktop, and displays the virtual image distance l' through the display device.

9. The desktop telescopic reading and writing device according to claim 8, characterized in that: The telescopic optical system further includes a second concave reflector, and the light reflected by the table and the object placed on the table is directed to the plane beam splitter from below, and is split at the position of the plane beam splitter to form a second light, and then the second light is reflected by the second concave reflector, and is directed to the exit pupil position through the plane beam splitter to form a defocused image; The controller obtains the defocus degree D corresponding to the image distance of the defocused image according to the distance d from the bottom of the desktop telescopic image reading and writing device to the desktop or an object placed on the desktop, and displays the defocus degree D through the display device.

10. The desktop telescopic reading and writing device according to claim 8 or 9, characterized in that: The diagonal size of the display device is no greater than 5 inches.

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