Optical remote image device with switchable magnification

Abstract

An optical remote image device with a switchable magnification belongs to the technical field of optical imaging and comprises a first lens group, a first reflector, a second reflector, a shell, a second lens group, a switchable lens group, a support and a reading tabletop. The first reflecting mirror and the second reflecting mirror are arranged in the shell; the lens group I and the lens group II are arranged on the surface of the shell; the shell and the reading table top are installed on the support. Light emitted or reflected by a reading object placed on the reading table surface passes through the lens group II, the first reflecting mirror, the second reflecting mirror and the lens group I to form a light path to reach human eyes, and the human eyes can see a remote and amplified virtual image of the reading object; and the switchable lens group is detachably arranged in the light path. According to the utility model, different switchable lens groups are removed or replaced in a light path, so that the amplification factor of the system is adjustable, the application range of font size or electronic screen size is wider, and the problems that small fonts or small screens cannot be seen clearly, view fields are not matched and the like in the existing scheme can be effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical imaging, and in particular relates to an optical telescopic imaging device with switchable magnification. Background Art

[0002] With the development of education and changes in entertainment methods, the length of time children and adolescents spend reading, writing, and watching electronic screens every day is increasing. These learning and entertainment activities are close-up use of the eyes, which can easily affect eye health, especially aggravating the formation and development of myopia. When watching books or electronic screens at close range, the eye axis is in an elongated state, and the eye muscles of children and adolescents are in the growth and development stage. Long-term close-up use of the eyes can easily lead to eye muscle fatigue, which reduces the ability of the eye axis to adjust, thereby causing myopia and other problems. When reading, writing, or watching electronic screens, it is difficult for children and adolescents to maintain a correct sitting posture for a long time, which may cause developmental problems such as hunchbacks and spinal curvature. The "Big Data Report on Eye Behavior of Chinese Youth" analyzes the eye behavior habits of children and adolescents in my country in detail. According to the report, the average eye distance of children and adolescents when reading books or using electronic screens is 29.8cm, which is lower than the prescribed standard eye distance of 33cm. The report shows that more than half of children and adolescents have eye health risks when reading books or using electronic screens because the eye distance is too close.

[0003] The Chinese patent authorization announcement number is "CN 220357326 U", and the patent name is "Telescopic image display device, study table and telescopic image display equipment". The patent uses two reflectors to form a telescopic image display device. The light emitted by the book or display screen passes through the first reflective surface and the second reflective surface to form a distant and enlarged virtual image that enters the human eye. However, the optical system focal length and magnification of the telescopic image display device described in the patent are fixed, and cannot adapt to the use scenarios where the size of book fonts and electronic screen details changes. When the book font or electronic screen is small, there is a problem of unclear vision; when the book font or electronic screen is large, there is a problem of less reading content or the field of view cannot cover the entire electronic screen. Therefore, a new solution is urgently needed in the prior art to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to realize switchable magnification in a telephoto device to adapt to texts and electronic screens of different sizes.

[0005] An optical telescopic image device with switchable magnification comprises: a first lens group, a first reflector, a second reflector, a housing, a second lens group, a switchable lens group, a bracket and a reading table;

[0006] The first reflector and the second reflector are arranged in the housing;

[0007] The lens group 1 and the lens group 2 are respectively arranged on the surface of the housing;

[0008] The housing and the reading table are mounted on a bracket;

[0009] The light emitted or reflected by the reading material placed on the reading table reaches the human eye through the second lens group, the first reflector, the second reflector, and the first lens group to form an optical path. The human eye can see a virtual image of the reading material that is zoomed in and magnified.

[0010] The switchable lens group is detachably arranged in the optical path.

[0011] The first reflector and the second reflector may be curved surfaces or flat surfaces.

[0012] The number of lenses in the lens group 1 is one or more, the number of lenses in the lens group 2 is one or more, the lens group 1, the first reflector, the second reflector and the lens group 2 form a telephoto optical system, and the combined optical power is positive.

[0013] The first lens group is a monocular lens group or a binocular lens group.

[0014] The number of lenses in the switchable lens group is one or more, and the optical focal length of the switchable lens group is positive or negative.

[0015] The switchable lens group is installed in the direction of light propagation, and is arranged before lens group one or after lens group one or before lens group two or after lens group two.

[0016] The switchable lens group is a monocular lens group or a binocular lens group.

[0017] The reading table can be moved up and down so that the observed object is located on the focal plane along the direction of light propagation, or between the focal plane and the second lens group.

[0018] The upper surface of the reading table is located on the focal plane of the optical system composed of the switchable lens group, the first lens group, the first reflector, the second reflector and the second lens group, or between the focal plane and the second lens group.

[0019] The reading material is a book, paper or electronic display screen.

[0020] The beneficial effects of the utility model are as follows: the optical telephoto device with switchable magnification proposed by the utility model adopts a refraction-reflection combined optical system to form a virtual image that is zoomed out and magnified. The first reflector and the second reflector fold the optical path so that the book or electronic screen is at a required angle with the observation direction of the human eye and forms a positive image. The switchable lens group can change the optical focal length of the system optical path, thereby changing the magnification. By replacing the switchable lens group, it can adapt to texts or electronic screens of different sizes. When the system optical focal length is large, the magnification is large, the field of view is small, and smaller texts or electronic screens can be seen clearly; when the system optical focal length is small, the magnification is small, the field of view is large, and larger texts or electronic screens can be seen clearly. The device can make the human eye see the virtual image of the book or electronic display screen that is zoomed out and magnified, and the magnification is switchable, which can be applied to texts and electronic screens of different sizes, relieve the fatigue of the human eye caused by reading books or watching electronic display screens at close range, and long-term use by children and adolescents can effectively delay the formation and development of myopia. When using the optical telescopic device to view books or electronic screens, one can look up and straight ahead without lowering the head or bending over, thus avoiding bone development problems such as hunchback and scoliosis in adolescents.

[0021] In the utility model, by removing or replacing different switchable lens groups in the optical path, the magnification of the system is adjustable, and the applicability to font size or electronic screen size is wider, which can effectively solve the problems of unclear small fonts or small screens, field of view mismatch, etc. in existing solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of Example 1 of an optical telescopic imaging device with switchable magnification according to the utility model.

[0023] Figure 2 It is a structural schematic diagram of Example 2 of an optical telescopic imaging device with switchable magnification according to the utility model.

[0024] Figure 3 It is a structural schematic diagram of Example 3 of an optical telescopic imaging device with switchable magnification according to the utility model. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0026] An optical telescopic image device with switchable magnification, comprising: a lens group 1, a first reflector 2, a second reflector 3, a housing 4, a lens group 2 5, a switchable lens group 6, a bracket 7 and a reading table 8;

[0027] The first reflector 2 and the second reflector 3 are arranged in a housing 4;

[0028] The lens group 1 and the lens group 2 5 are respectively arranged on the surface of the housing 4;

[0029] The housing 4 and the reading table 8 are mounted on a bracket 7;

[0030] The light emitted or reflected by the reading material 9 placed on the reading table 8 reaches the human eye through the lens group 2 5, the first reflector 2, the second reflector 3, and the lens group 1 to form an optical path. The human eye can see a virtual image of the reading material 9 that is zoomed in and enlarged.

[0031] The switchable lens group 6 is detachably arranged in the optical path.

[0032] The first reflector 2 and the second reflector 3 may be curved surfaces or flat surfaces.

[0033] The number of lenses in the lens group 1 is one or more, the number of lenses in the lens group 2 5 is one or more, the lens group 1 , the first reflector 2 , the second reflector 3 and the lens group 2 5 form a telephoto optical system, and the combined optical power is positive.

[0034] The lens group 1 is a monocular lens group or a binocular lens group.

[0035] The switchable lens group 6 includes one or more lenses, and the optical focal length of the switchable lens group 6 is positive or negative.

[0036] The switchable lens group 6 is installed along the direction of light propagation and is arranged before lens group 1 or after lens group 1 or before lens group 2 5 or after lens group 2 5.

[0037] The switchable lens group 6 is a monocular lens group or a binocular lens group.

[0038] The reading table 8 can be moved up and down so that the observed object is located on the focal plane or between the focal plane and the lens group 2 5 along the direction of light propagation.

[0039] The upper surface of the reading table 8 is located on the focal plane of the optical system composed of the switchable lens group 6 , the lens group 1 1 , the first reflector 2 , the second reflector 3 and the lens group 2 5 , or between the focal plane and the lens group 2 5 .

[0040] The reading material 9 is a book, paper or an electronic display screen.

[0041] Example 1

[0042] like Figure 1As shown, in this embodiment, lens group 1 is a monocular lens group, which is composed of a double convex lens and a plano-concave lens; the first reflector 2 and the second reflector 3 are plane reflectors, which are arranged in the shell 4; the lens group 2 5 is composed of a double convex lens; the lens group 1, the first reflector 2, the second reflector 3 and the lens group 2 5 constitute a telephoto optical system, and its combined optical focal length is positive; the switchable lens group 6 is a monocular lens, which is composed of a double convex lens, and its optical focal length is positive, and the switchable lens group 6 can be installed in the telephoto optical path or removed from the telephoto optical path; the lens group 1 and the lens group 2 5 are arranged on the frame surface of the shell 4; the shell 4 and the reading table 8 are installed on the bracket 7, and the reading table 8 can be moved up and down; the reading material 9 placed on the reading table 8 is a display screen of a tablet computer.

[0043] The path of the light emitted by the reading material 9 to the human eye is: reading material 9 → lens group 2 5 → first reflector 2 → second reflector 3 → lens group 1 1 → switchable lens group 6 → human eye. At this time, the combined focal length of the telephoto light path is f2. Since the optical power of the switchable lens group 6 is positive, f2 < f1. The reading table 8 needs to be moved upward to Figure 1 At the middle dotted line position, the upper surface of the reading table 8 is located near the focal plane of the telephoto optical path, and the distance from the lower surface of the housing 4 is L2, L2<L1. After the switchable lens group 6 is installed, the system magnification becomes larger, and the field of view is smaller than when the switchable lens group 6 is not installed, and the virtual image of the reading material 9 seen by the human eye is larger than when the switchable lens group 6 is not installed.

[0044] Example 2

[0045] like Figure 2 As shown, in this embodiment, lens group 1 is a monocular lens group, which is composed of a double convex lens; the first reflector 2 and the second reflector 3 are plane reflectors, which are arranged in the shell 4; the lens group 2 5 is composed of a transparent flat plate with no optical focal length; the lens group 1, the first reflector 2, the second reflector 3 and the lens group 2 5 constitute a telephoto optical system, and its combined optical focal length is positive; the switchable lens group 6 is a monocular lens, which is composed of a plano-concave lens, and its optical focal length is negative, and the switchable lens group 6 can be installed in the telephoto optical path or removed from the telephoto optical path; the lens group 1 and the lens group 2 5 are arranged on the frame surface of the shell 4; the shell 4 and the reading table 8 are installed on the bracket 7, and the reading table 8 can be moved up and down; the reading material 9 placed on the reading table 8 is a book.

[0046] When the switchable lens group 6 is installed in the optical path, the path of the light reflected by the reading material 9 to the human eye is: reading material 9 → lens group 2 5 → first reflector 2 → second reflector 3 → lens group 1 1 → switchable lens group 6 → human eye. At this time, the combined focal length of the telephoto optical path is f4. Since the optical power of the switchable lens group 6 is negative, f3 < f4, and the reading table 8 needs to be moved downward to Figure 2 At the middle dotted line position, the upper surface of the reading table 8 is located near the focal plane of the telephoto optical path, and the distance from the lower surface of the housing 4 is L4, L3<L4. After the switchable lens group 6 is installed, the system magnification becomes smaller, and the field of view is larger than when the switchable lens group 6 is not installed, and the virtual image of the reading material 9 seen by the human eye is smaller than when the switchable lens group 6 is not installed.

[0047] Example 3

[0048] like Figure 3 As shown, in this embodiment, lens group 1 is a monocular lens group, which is composed of a double convex lens; the first reflector 2 and the second reflector 3 are plane reflectors, which are arranged in the shell 4; the lens group 2 5 is composed of a double convex lens; the lens group 1, the first reflector 2, the second reflector 3 and the lens group 2 5 constitute a telephoto optical system, and its combined optical focal length is positive; the switchable lens group 6 is a monocular lens, which is composed of a plano-concave lens, and its optical focal length is negative, and the switchable lens group 6 can be installed in the telephoto optical path or removed from the telephoto optical path; the lens group 1 and the lens group 2 5 are arranged on the frame surface of the shell 4; the shell 4 and the reading table 8 are installed on the bracket 7, and the reading table 8 can be moved up and down; the reading material 9 placed on the reading table 8 is a book.

[0049] When the switchable lens group 6 is installed in the optical path, the path of the light reflected by the reading material 9 to the human eye is: reading material 9 → switchable lens group 6 → lens group 2 5 → first reflector 2 → second reflector 3 → lens group 1 1 → human eye. At this time, the combined focal length of the telephoto optical path is f6. Since the optical power of the switchable lens group 6 is negative, f5<f6, and the reading table 8 needs to be moved downward to Figure 3 At the middle dotted line position, the upper surface of the reading table 8 is located near the focal plane of the telephoto optical path, and the distance from the lower surface of the housing 4 is L6, L5<L6. After the switchable lens group 6 is installed, the system magnification becomes smaller, and the field of view is larger than when the switchable lens group 6 is not installed, and the virtual image of the reading material 9 seen by the human eye is smaller than when the switchable lens group 6 is not installed.

[0050] Although the specific implementation modes of the present invention are described above in conjunction with the accompanying drawings, this does not limit the protection scope of the present invention.

Claims

1. An optical telescopic imaging device with switchable magnification, comprising: Lens group one (1), a first reflector (2), a second reflector (3), a housing (4), lens group two (5), a switchable lens group (6), a bracket (7) and a reading table (8); The first reflector (2) and the second reflector (3) are arranged in a housing (4); The lens group 1 (1) and the lens group 2 (5) are arranged on the surface of the housing (4); The housing (4) and the reading table (8) are mounted on a bracket (7); Light emitted or reflected by a reading object (9) placed on the reading table (8) forms an optical path through the second lens group (5), the first reflector (2), the second reflector (3), and the first lens group (1) to reach the human eye, and the human eye can see a virtual image of the reading object (9) that is magnified and zoomed in. The switchable lens group (6) is detachably arranged in the optical path.

2. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The first reflector (2) and the second reflector (3) may be curved surfaces or flat surfaces.

3. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The number of lenses in the lens group one (1) is one or more, the number of lenses in the lens group two (5) is one or more, and the lens group one (1), the first reflector (2), the second reflector (3) and the lens group two (5) form a telephoto optical system, and the combined optical power is positive.

4. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The lens group one (1) is a monocular lens group or a binocular lens group.

5. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The number of lenses in the switchable lens group (6) is one or more, and the optical focal length of the switchable lens group (6) is positive or negative.

6. The optical telescopic device with switchable magnification according to claim 1, characterized in that: Along the direction of light path propagation, the switchable lens group (6) is installed before the lens group one (1) or after the lens group one (1) or before the lens group two (5) or after the lens group two (5).

7. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The switchable lens group (6) is a monocular lens group or a binocular lens group.

8. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The reading table (8) can be moved up and down so that the object to be observed is located on the focal plane along the direction of light propagation, or is located between the focal plane and the second lens group (5).

9. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The upper surface of the reading table (8) is located on the focal plane of an optical system composed of a switchable lens group (6), a lens group one (1), a first reflector (2), a second reflector (3) and a lens group two (5), or between the focal plane and the lens group two (5).

10. The optical telescopic device with switchable magnification according to claim 1, characterized in that: The reading material (9) is a book, paper or an electronic display screen.

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