Glass prism optical path shifting device

Abstract

The present invention relates to a glass prism optical path shifting device, comprising: at least one rhombus-shaped total reflection prism; at least one first trapezoidal structured glass; and a first air slot formed in the first trapezoidal structured glass and in contact with the rhombus-shaped total reflection prism. Light propagation undergoes one or more total internal reflections at the interface between the rhombus-shaped total reflection prism and air. The present invention relates to a glass prism optical path shifting device that operates properly in both the visible and infrared wavelengths.

Description

Technical Field

[0001] The invention relates to a glass prism optical path axis shifting device. Background Art

[0002] With advances in technologies such as consumer electronics and optical modules, and driven by immense pressures from cost and functional integration, the size of optical components has been significantly reduced, while the functions that a single optical device can perform have also increased significantly. This significant reduction in size offers significant advantages in cost control and mass production. The integrated functionality of a single device has also significantly expanded the application scenarios for optical devices: not only can more functions be implemented within the limited space of an optical module, but the advantages of compactness and lightness can also be realized in the consumer electronics field. Among the many integrated optical devices, the diamond tilt-shift prism is a widely used product. Its function is to bend the optical path within a limited space through total internal reflection, ultimately achieving the function of optical path shifting. Existing solutions for diamond prisms use silicon prisms, which are particularly widely used in the infrared communication band.

[0003] Since a single rhombus prism has a total of 6 planes: two planes for input and output, two planes for total internal reflection, and only two planes for structural fixation. These two remaining planes are very limited in terms of usage scenarios and structural fixation. Therefore, under normal circumstances, rhombus prisms are made by gluing two trapezoidal structural parts on the total reflection surface, usually using structural glass with a low expansion coefficient. In the end, a standard rectangular parallelepiped is formed, and the number of planes that can be used for fixation is also increased, which adds many degrees of freedom for the subsequent fixation and clamping of the entire prism.

[0004] The refractive index of the silicon prism material is around 3.4, and the prism is bonded to conventional structural glass using glue. The refractive index of the glue is typically around 1.4 to 1.5, far lower than silicon's 3.4. This significant refractive index difference allows light waves, when propagating from the silicon material into the glue, to pass from a denser medium into a less dense medium, thereby achieving total internal reflection at the interface. Total internal reflection eliminates the need for reflective film coating, and its efficiency is extremely high, with virtually no energy loss. Through clever material selection and structural design, bending and translation of the optical path are achieved.

[0005] However, as application scenarios expand and increase, demand is gradually shifting to shorter wavelengths. In particular, in the display and sensing fields, demand is increasingly shifting to the visible light band. At these wavelengths, existing silicon materials cannot function properly due to their ability to absorb light energy. Summary of the Invention

[0006] The purpose of the present invention is to provide a glass prism optical path shifting device to overcome the defect that the existing silicon material cannot work normally due to its characteristic of absorbing light energy.

[0007] The technical solution to achieve the above purpose is:

[0008] A glass prism optical path shifting device, comprising:

[0009] at least one rhombus-shaped total reflection prism;

[0010] At least one first trapezoidal structure glass connected to the rhombus total reflection prism; and

[0011] A first air groove is provided on the first trapezoidal structure glass and contacts the rhombus-shaped total reflection prism.

[0012] Preferably, it also includes:

[0013] at least one second trapezoidal structured glass; and

[0014] a second air groove formed on the second trapezoidal structure glass and in contact with the rhombus-shaped total reflection prism surface;

[0015] Wherein, a pair of parallel side surfaces of the rhombus-shaped total reflection prism are respectively connected to the first trapezoidal structure glass and the second trapezoidal structure glass.

[0016] Preferably, the rhombus total reflection prism is made of optical glass or quartz.

[0017] Preferably, the first trapezoidal structure glass and the second trapezoidal structure glass are connected to the rhombus total reflection prism by optical adhesive.

[0018] Preferably, the first trapezoidal structure glass and the second trapezoidal structure glass are connected to the rhombus total reflection prism by glue.

[0019] Preferably, the light propagation path undergoes total internal reflection at the air interface between the rhombus total reflection prism and the first air slot or the second air slot.

[0020] Preferably, the first trapezoidal structure glass and / or the second trapezoidal structure glass are connected with a clamping piece.

[0021] The present invention has the following beneficial effects: by providing a rhombus-shaped total reflection prism, a first trapezoidal structure glass, and a second trapezoidal structure glass, respectively providing a first air slot and a second air slot in the first trapezoidal structure glass and the second trapezoidal structure glass, and using conventional optical glass materials to manufacture the rhombus-shaped prism, the incident position of light can be precisely controlled, so that the reflection point of light after propagating within the rhombus-shaped total reflection prism falls exactly on the interface between the glass and the first and second air slots, thereby allowing light to undergo total internal reflection at the interface between the optical glass and air. This solution can achieve the bending and translation of the optical path, ultimately realizing the optical path shift function, and can function normally in both the visible light and infrared bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0023] Figure 2 This is a light path propagation diagram of the rhombus total reflection prism of the present invention;

[0024] Figure 3 is a schematic diagram of another embodiment of the present invention.

[0025] In the figure: 1. First trapezoidal structure glass; 2. First air slot; 3. Rhombus total reflection prism; 4. Second trapezoidal structure glass; 5. Second air slot; 6. Light propagation path. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] like Figure 1-3 As shown, a glass prism optical path shifting device includes: at least one rhombus total reflection prism 3; at least one first trapezoidal structure glass 1 and a second trapezoidal structure glass 4.

[0029] A first air slot 2 is provided in the first trapezoidal structured glass 1 and contacts the rhombus-shaped total reflection prism 3. A second air slot 5 is provided in the second trapezoidal structured glass 4 and contacts the rhombus-shaped total reflection prism 3. A pair of parallel side surfaces of the rhombus-shaped total reflection prism 3 connect the first trapezoidal structured glass 1 and the second trapezoidal structured glass 4, respectively. Light propagation path 6 undergoes one or more total internal reflections at the interface between the rhombus-shaped total reflection prism 3 and air, i.e., the air interface between the rhombus-shaped total reflection prism 3 and the first air slot 2 or the second air slot 5.

[0030] The rhombus-shaped total reflection prism 3 must be made of a material that does not significantly absorb the propagating light waves. For example, optical glass or quartz can be used. The first trapezoidal structure glass 1 and the second trapezoidal structure glass 4 are connected to the rhombus-shaped total reflection prism 3 using optical adhesive. If adhesive bonding is used instead of optical adhesive, it can also be used instead of optical adhesive without affecting the light path propagation.

[0031] Specifically, the entire optical device consists of a rhombus total reflection prism 3 as its core component, and the light propagation path 6 is transmitted inside it, which can achieve total reflection and light path bending. The rhombus total reflection prism 3 is fixed by a first trapezoidal structure glass 1 and a second trapezoidal structure glass 4. The shapes of the first trapezoidal structure glass 1 and the second trapezoidal structure glass 4 are parallel and complementary to the rhombus total reflection prism 3, and finally form a complete rectangular parallelepiped. The number of planes that can be used for fixing the complete rectangular parallelepiped has also increased: including the various faces of the first trapezoidal structure glass 1 and the second trapezoidal structure glass 4 and the front and back faces of the entire rectangular parallelepiped, which can all be used for fixing and clamping, thus adding many degrees of freedom to the use of the entire prism. The light propagation path 6 is incident on the rhombus total reflection prism 3 from the left. Light propagates in a straight line inside the rhombus total reflection prism 3 until it reaches the interface between the rhombus total reflection prism 3 and the first air slot 2 and the second air slot 5, where it is reflected and refracted. The material used for the rhombus total reflection prism 3 can be optical glass or quartz, and its refractive index is usually around 1.5. The other side of the interface is air, which has a refractive index of approximately 1.0. The law of refraction of light is as follows:

[0032] n1·sinθ1=n2·sinθ2

[0033] Where n1 is the refractive index of medium 1; θ1 is the angle of incidence in medium 1; n2 is the refractive index of medium 2; θ2 is the angle of refraction in medium 2.

[0034] According to the law of refraction, the refractive index of glass is n1 = 1.5, and the refractive index of air is n2 = 1.0. When light is transmitted from the denser medium glass to the less dense medium air, as long as the incident angle is greater than

[0035] arcsin(1 / 1.5)=41.8°

[0036] Total internal reflection can be achieved, thus realizing the bending and translation functions of the light path. If other materials are used, the critical angle can also be calculated according to this formula.

[0037] The material used for the rhombus total reflection prism 3 can be optical glass or quartz, which can work in a wider wavelength range after use. However, the resulting low refractive index will also affect the propagation of the light path due to the existing glue bonding process. The refractive index of existing glass is between 1.4 and 1.5, and the refractive index of commonly used glue is also around 1.4 to 1.5, and in some cases even higher than that of optical glass. It is impossible to achieve total internal reflection under such refractive index conditions. In order to realize the propagation mode of the light path according to the original design and realize the light path of total internal reflection, the design of the first air groove 2 and the second air groove 5 is added to avoid the reflection interface between glass and glue and change the reflection interface to the interface between glass and air, thereby meeting the conditions for total internal reflection and allowing the rhombus total reflection prism 3 to work normally.

[0038] In another embodiment, the first trapezoidal structure glass 1 is omitted from the original design, and the light path can also be transmitted according to the original design scheme. At the same time, the single trapezoidal light structure component can also achieve the original fixing and clamping functions.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A glass prism optical path shifting device, characterized in that: include: At least one rhombus-shaped total reflection prism (3); At least one first trapezoidal structure glass (1) connected to the rhombus-shaped total reflection prism (3); as well as a first air groove (2) formed on the first trapezoidal structure glass (1) and in contact with the rhombus-shaped total reflection prism (3); Also includes: at least one second trapezoidal structured glass (4); and a second air groove (5) formed on the second trapezoidal structure glass (4) and in surface contact with the rhombus-shaped total reflection prism (3); Wherein, a pair of parallel side surfaces of the rhombus-shaped total reflection prism (3) are respectively connected to the first trapezoidal structure glass (1) and the second trapezoidal structure glass (4); The light propagation path (6) undergoes total internal reflection at the air interface between the rhombus total reflection prism (3) and the first air slot (2) or the second air slot (5); The first trapezoidal structure glass (1) and / or the second trapezoidal structure glass (4) are connected with a clamping piece; The shapes of the first trapezoidal structure glass (1) and the second trapezoidal structure glass (4) are parallel and complementary to the rhombus-shaped total reflection prism (3), and finally form a complete cuboid.

2. The glass prism optical path shifting device according to claim 1, characterized in that: The rhombus total reflection prism (3) is made of optical glass or quartz.

3. The glass prism optical path shifting device according to claim 1, characterized in that: The first trapezoidal structure glass (1) and the second trapezoidal structure glass (4) are connected to the rhombus total reflection prism (3) through optical glue.

4. The glass prism optical path shifting device according to claim 1, characterized in that: The first trapezoidal structure glass (1) and the second trapezoidal structure glass (4) are connected to the rhombus total reflection prism (3) by glue.

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