Binocular optical locator and optical filter for binocular optical locator

Abstract

The utility model belongs to the technical field of optical filters for binocular optical position indicators, and discloses a binocular optical position indicator and an optical filter for the binocular optical position indicator, which comprise inner ring glass and outer ring glass, a plurality of layers of filter films are plated on the inner ring glass to form a 910 + / -30nm band-pass filter; the outer ring glass is plated with a plurality of layers of light filtering films to form a 850-910nm linear gradual change light filter; according to the utility model, the long-wave-pass infrared optical filter is prepared by adopting a glass coating process, the optical property of the optical filter is improved, the 910 + / -30nm band-pass optical filter filters out interference light such as natural light with wavelengths lower than 880nm and higher than 940nm, removes miscellaneous points and noise, and only retains light within a spectrum of 880-940nm, and the 780-910nm linear gradual change optical filter filters out interference light with a spectrum wavelength outside 780-910nm, so that the optical property of the optical filter is improved. Interference light with the spectrum overlapped with natural light is filtered out, the precision of the binocular optical locator is improved, the installation frame is rapidly installed and rotated through the clamping block, a gap at the non-tight attaching position is eliminated, and it is guaranteed that the sealing effect between the lens barrel and the installation frame is blocked by the elastic blocking ring.

Description

Technical Field

[0001] The utility model relates to the technical field of filters used for optical binocular sight locators, in particular to a binocular sight locator and a filter used for the binocular sight locator. Background Art

[0002] Most binocular optical locators on the market use acrylic long-wavelength infrared filters with a cutoff wavelength near 750nm. These filters are not ideal for filtering natural light. If a binocular optical locator is used in a strong natural light environment, the acrylic infrared filter cannot effectively filter out the natural light, resulting in an overly bright background in the image, making it impossible to identify the marker ball, and significantly reducing the accuracy of the binocular optical locator. Utility Model Content

[0003] The main purpose of the utility model is to provide a binocular optical locator and a filter for the binocular optical locator, aiming to solve the technical problem of low positioning accuracy of the filter in the prior art.

[0004] In order to achieve the above-mentioned purpose of the utility model, the first aspect of the utility model provides a filter for a binocular optical locator, comprising an inner ring glass and an outer ring glass sleeved outside the inner ring glass;

[0005] The inner glass is coated with one or more filter films to form a 910±30nm bandpass filter;

[0006] One or more filter films are coated on the outer ring glass to form a 780-910nm linear gradient filter, and further, it can be an 850-910nm linear gradient filter.

[0007] Furthermore, the thickness of the multilayer film structure of the one or more filter films is 1 / 4 of the design wavelength;

[0008] Furthermore, the circular glass and the outer ring glass are integrally formed.

[0009] The first aspect of the present invention proposes a binocular optical locator, comprising a binocular optical locator body with an image sensor module and a digital signal processor inside, a light source, a lens barrel, and the above-mentioned filter, wherein the filter is mounted on the lens barrel and collects infrared images through the filter having a matching structure of the inner ring glass and the outer ring glass, the inner ring glass being a lens filter, and the outer ring glass being an infrared lamp filter.

[0010] Furthermore, a mounting frame is installed at the edge of the outer ring glass, and a plurality of blocks are provided on the mounting frame for engaging with the lens barrel port. A sealing ring is provided on the side of the mounting frame, and an adjustment column is rotated on the block, and the adjustment column is frictionally engaged with the sealing ring and the mounting frame at the same time;

[0011] The glass filters of different wavelength bands are quickly installed and removed from the lens barrel port through the clamping block and the sealing ring, and the glass filters are rotated and adjusted through the adjusting column.

[0012] Furthermore, the blocking ring is an elastic blocking ring, the clamping block is provided with a movable groove for rotationally cooperating with the blocking ring, and the clamping block is provided with a rotating groove for rotationally cooperating with the installation frame.

[0013] Furthermore, the adjustment column includes a rotating plate distributed in two gaps of the rotating block, the edge of the rotating plate penetrates into the rotating groove and frictionally and rollingly cooperates with the mounting frame, and an anti-skid plate is provided on the top of the rotating plate.

[0014] Furthermore, the vertical cross-section of the rotating plate is in the shape of an "I" character, and a convex ring adapted to the shape of the rotating plate is fixedly connected to the clamping block to ensure smooth rotation.

[0015] Furthermore, a connecting rod is fixedly connected between the two rotating plates, and the top edge of the rotating plate located at the bottom is frictionally engaged with the blocking ring.

[0016] Furthermore, the sides of the clamping block are inclined to facilitate quick clamping, and the vertical cross-section of the sealing ring is an arc-shaped structure to ensure close contact.

[0017] Furthermore, an elastic extrusion column is fixedly connected to the inclined surface of the clamping block to enhance the clamping effect.

[0018] Beneficial effects:

[0019] The utility model discloses a filter, which adopts a glass coating process to prepare a long-wave infrared filter, thereby improving the optical properties of the filter. The 910±30nm bandpass filter filters out interfering light such as natural light with a wavelength lower than 880nm and higher than 940nm, removes spots and noise, and retains only light within the 880-940nm spectrum. In addition, a 780-910nm linear gradient filter is added to the front end of the infrared light ring to filter out interfering light with a spectrum outside the 780-910nm wavelength, and the interfering light whose spectrum overlaps with natural light is filtered out. Therefore, filtering out the influence of interfering light can significantly improve the quality of lens imaging pictures, eliminate spots and noise points, and improve the accuracy of binocular optical locators.

[0020] It is quickly installed through the clamping block, and then the anti-slip plate is rotated by fingers to make the rotating plate rotate in the clamping block, thereby driving the elastic sealing ring to overcome the friction between the lens barrel and the rotating plate to rotate, and rotating the mounting frame to eliminate the gap in the loose fit, ensuring the sealing effect of the elastic sealing ring between the lens barrel and the mounting frame, and also facilitating the rotation of the filter angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the plug-in matching structure of the optical filter and the lens barrel of the utility model;

[0022] Figure 2 This utility model Figure 1 The structural diagram of the lens barrel is removed;

[0023] Figure 3 This is a schematic diagram of the matching structure between the clamping block and the mounting frame of the utility model;

[0024] Figure 4 This is a schematic diagram of the split structure between the card block and the installation frame of the utility model;

[0025] Figure 5 This utility model Figure 2 Schematic diagram of the structural cross section;

[0026] Figure 6 This utility model Figure 4 Schematic diagram of the structural decomposition in .

[0027] in:

[0028] 1-installation frame; 2-block; 3-sealing ring; 4-adjusting column; 401-rotation plate; 402-anti-slip plate; 403-convex ring; 404-connecting rod; 5-movable groove; 6-rotation groove; 7-elastic extrusion column.

[0029] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0030] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions 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 direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] Reference Figures 1-6 An embodiment of the present invention provides a filter for a binocular optical locator, comprising an inner ring glass and an outer ring glass sleeved outside the inner ring glass;

[0035] The inner glass is coated with one or more filter films to form a 910±30nm bandpass filter;

[0036] One or more filter films are coated on the outer ring glass to form an 850-910nm linear gradient filter;

[0037] The glass filter is snapped into the lens barrel of the binocular optical positioner, and the infrared filter located at the front end of the lens barrel uses a 910±30nm bandpass filter. The relevant parameters are as follows:

[0038] Central wavelength: 910nm

[0039] Half-peak bandwidth: 60nm

[0040] Starting wavelength: 880nm

[0041] Cut-off wavelength: 940nm

[0042] Peak transmittance: ≥92%

[0043] Cut-off depth: ≥OD3

[0044] The 910±30nm bandpass filter filters out interfering light such as natural light with wavelengths below 880nm and above 940nm, removes spots and noise, and only retains light within the 880-940nm spectrum.

[0045] It is worth noting that the binocular sight locator has an infrared light ring, which emits infrared light with a central wavelength of around 910±30nm after power-on. Therefore, it is necessary to add a 780-910nm linear gradient filter to the front end of the infrared light ring to filter out interference light outside the 780-910nm wavelength range and to filter out interference light whose spectrum overlaps with natural light.

[0046] The relevant parameters of the 780-910nm linear gradient filter at the front end of the infrared light ring are as follows:

[0047] Starting wavelength: 780nm

[0048] Half-peak wavelength: 830nm

[0049] Peak transmittance: ≥92%

[0050] Cut-off depth: ≥OD3

[0051] The outer ring glass is coated with one or more filter films, and further, it can be an 850-910nm linear gradient filter;

[0052] The main function of infrared bandpass filters is to allow light in a specific infrared band to pass through, while blocking or reflecting light in other bands. This characteristic is particularly important in optical equipment and infrared detection applications.

[0053] Among them, the surface of the marking ball inside the matching binocular optical locator is coated with reflective material, which can reflect the infrared light emitted by the infrared light ring and display highlights on the lens imaging picture, so it can accurately identify the marking point. Therefore, filtering out the influence of interfering light can significantly improve the quality of the lens imaging picture, eliminate miscellaneous spots and noise points, and improve the accuracy of the binocular optical locator.

[0054] It is worth emphasizing the working principle of the infrared bandpass filter:

[0055] The working principle of infrared bandpass filters is based on the interference effect, which specifically includes the following parts:

[0056] Constructive Interference Transmission: The thickness of the multilayer film is designed to be one-quarter the wavelength (λ / 4) of a specific infrared wavelength to ensure that light in the target wavelength band produces constructive interference between the multilayer films. This allows the light in the target wavelength band to be superimposed in the multilayer film and pass through the filter.

[0057] Destructive interference blocking: For light waves in non-target bands, due to the mismatch of film thickness, light of these wavelengths will be reflected between layers and destructively interfere, thus being effectively blocked.

[0058] Broadband and narrowband control: The bandwidth (bandwidth) of a filter is determined by the number of film layers and the refractive index difference between the layers. The more layers there are and the greater the refractive index difference, the narrower the bandwidth; conversely, the wider the bandwidth.

[0059] Multi-layer design optimization: Typically, the design of bandpass filters is also optimized at multiple levels to ensure that the filter has high transmittance for the target band, while having high reflectivity and low light leakage for the blocked band.

[0060] The 780-910nm linear gradient filter and the 910±30nm bandpass filter are fixed with an inner and outer ring structure. It is worth noting that the inner and outer rings have different spectral transmission characteristics, which can more accurately control the transmitted spectral range and improve spectral selectivity. The design of the inner and outer rings can more effectively suppress unnecessary wavelengths and reduce the interference of stray light, which is very important for improving imaging quality and signal detection accuracy.

[0061] The thickness of the multi-layer film structure is 1 / 4 of the design wavelength, and the surface of the marker ball corresponding to the glass filter is coated with a reflective material layer;

[0062] The inner ring glass and the outer ring glass are made as one-piece, which helps to reduce optical distortion and visual deviation. It is durable and safer, and reduces the installation steps, making installation convenient.

[0063] Infrared bandpass filters (this application uses a 910±30nm bandpass filter) are typically made of alternating layers of high and low refractive index dielectric films (i.e., a multilayer film structure). By precisely controlling the thickness and number of film layers, selective transmission of a specific infrared band can be achieved. Their structure has the following characteristics:

[0064] Multilayer film structure: The filter consists of dozens or even hundreds of layers of high and low refractive index materials. The total thickness and number of layers of the film determine the filtering performance.

[0065] By designing the thickness of the infrared filter to be a quarter of the wavelength film layer: In order to ensure the transmission of light in a specific wavelength band, the thickness of each layer is usually designed to be a quarter of the target wavelength, which can produce a constructive interference effect.

[0066] It is worth noting that:

[0067] Since infrared light has a wide wavelength range, from near infrared to mid- and far infrared (0.7 to 14 microns), the filter material needs to have low absorption and high stability within the infrared band. Common filter coatings include:

[0068] High refractive index material film:

[0069] Titanium dioxide film (TiO): It has a high refractive index and good light transmittance in the 800-960 nanometer band. It is often used as a high refractive index layer in near-infrared filters.

[0070] Low refractive index material film:

[0071] Silicon dioxide film (SiO): widely used in the near-infrared band, with high stability and low absorption.

[0072] According to the actual use field and scenario of the filter, the user can selectively replace it by disassembly.

[0073] A binocular sight locator includes a binocular sight locator body with an image sensor module and a digital signal processor inside, a light source, a lens barrel, and the above-mentioned filter. The filter is installed on the lens barrel. Infrared images are collected through the filter having a matching structure of inner ring glass and outer ring glass. The inner ring glass is the lens filter and the outer ring glass is the infrared lamp filter.

[0074] The lens barrel and the optical locator body are threaded and rotated together. A mounting frame 1 is installed at the edge of the outer ring glass. The mounting frame 1 is provided with multiple blocks 2 that are engaged with the lens barrel ports. A sealing ring 3 is provided on the side of the mounting frame 1. An adjusting column 4 is rotated on the block 2. The adjusting column 4 is frictionally engaged with the sealing ring 3 and the mounting frame 1 at the same time.

[0075] Glass filters of different wavelength bands can be quickly installed and removed from the lens barrel through the clamping block 2 and the sealing ring 3, and the glass filters can be rotated and adjusted through the adjusting column 4.

[0076] The sealing ring 3 is an elastic sealing ring. A movable groove 5 is provided on the clamping block 2 for rotating with the sealing ring 3. A rotating groove 6 is provided on the clamping block 2 for rotating with the mounting frame 1. The vertical cross-section of the sealing ring 3 is an arc-shaped structure, which facilitates the bending of the end of the elastic sealing ring 3, thereby tightly pressing against the rotating plate 401.

[0077] The adjusting column 4 includes two rotating plates 401 distributed in the gaps between the block 2. The edge of the rotating plate 401 penetrates the rotating groove 6 and is in friction and rolling engagement with the mounting frame 1. An anti-slip plate 402 is provided on the top of the rotating plate 401.

[0078] The clamping block 2 is fixedly engaged with the lens barrel, and the elastic sealing ring 3 blocks the gap between the lens barrel and the mounting frame 1. The end of the elastic sealing ring 3 is frictionally engaged with the lens barrel, and the elastic sealing ring 3 is frictionally engaged with the rotating plate 401 in the adjusting column 4. As a result, the adjusting column 4 cannot rotate by overcoming the friction between the lens barrel and the rotating plate 401 when no force is applied.

[0079] Then, use your fingers to rotate the anti-slip plate 402 on the adjustment column 4, so that the rotating plate 401 rotates in the block 2, thereby driving the elastic sealing ring 3 to rotate, so that the elastic sealing ring 3 overcomes the friction between the lens barrel and the rotating plate 401 and rotates, and the mounting frame 1 is rotated to eliminate the gaps in the places where they are not tightly fitted (after the sealing ring 3 is installed to the lens barrel, it needs to be rotated to eliminate the small gaps between the sealing ring 3 and the lens barrel, so that the sealing ring 3 fits tightly to the lens barrel), ensuring the sealing effect of the elastic sealing ring 3 blocking the lens barrel and the mounting frame 1, and also facilitating the rotation of the angle of the filter.

[0080] The vertical cross section of the rotating plate 401 is in the shape of an I. A convex ring 403 matching the shape of the rotating plate 401 is fixedly connected to the clamping block 2 to ensure that the rotating plate 401 rotates stably in the original position in the clamping block 2.

[0081] A connecting rod 404 is fixedly connected between the two rotating plates 401. The top edge of the rotating plate 401 located at the bottom is frictionally engaged with the sealing ring 3. The two rotating plates 401 simultaneously limit the position of the elastic sealing ring 3, and the two rotating plates 401 are rotated at the same time through the connecting rod 404 without affecting the rotation effect of the rotating plate 401 on the sealing ring 3.

[0082] The sides of the clamping block 2 are inclined, which facilitates quick and accurate clamping with the lens barrel, and the number of the clamping blocks 2 is not less than three to ensure stability.

[0083] An elastic extrusion column 7 is fixedly connected to the inclined surface of the clamping block 2, so that the clamping connection between the clamping block 2 and the lens barrel is firm.

[0084] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A filter for a binocular optical locator, characterized in that: include: Inner ring glass, and outer ring glass sleeved on the outer side of the inner ring glass; The inner glass is coated with one or more filter films to form a 910±30nm bandpass filter; One or more filter films are coated on the outer ring glass to form a 780-910nm linear gradient filter.

2. The filter for binocular optical locator according to claim 1, characterized in that: The inner ring glass and the outer ring glass are integrally formed.

3. The filter for binocular optical locator according to claim 1, characterized in that: The thickness of the multilayer film structure of the one or more filter films is 1 / 4 of the design wavelength.

4. A binocular sight locator, comprising a binocular sight locator body with an image sensor module and a digital signal processor inside, a light source, a lens barrel, and the filter according to any one of claims 1 to 3, wherein the filter is mounted on the lens barrel, and collects infrared images through the filter having a matching structure of the inner ring glass and the outer ring glass, the inner ring glass being a lens filter, and the outer ring glass being an infrared lamp filter.

5. The binocular sight locator according to claim 4, characterized in that: A mounting frame (1) is installed at the edge of the outer ring glass, and a plurality of clamping blocks (2) that engage with the lens barrel port are provided on the mounting frame (1). A sealing ring (3) is provided on the side of the mounting frame (1), and an adjusting column (4) is provided on the clamping block (2) for self-rotation. The adjusting column (4) is frictionally engaged with the sealing ring (3) and the mounting frame (1) at the same time. The optical filters of different wavelength bands are quickly installed and removed from the lens barrel port through the clamping block (2) and the sealing ring (3), and the optical filters are rotated and adjusted through the adjusting column (4).

6. The binocular optical locator according to claim 5, characterized in that: The blocking ring (3) is an elastic blocking ring, the clamping block (2) is provided with a movable groove (5) for rotationally cooperating with the blocking ring (3), and the clamping block (2) is provided with a rotating groove (6) for rotationally cooperating with the installation frame (1).

7. The binocular optical locator according to claim 6, characterized in that: The adjusting column (4) includes two rotating plates (401) distributed in gaps for the rotation of the clamping block (2). The edge of the rotating plate (401) penetrates the rotating groove (6) and frictionally and rollingly cooperates with the mounting frame (1). An anti-slip plate (402) is provided on the top of the rotating plate (401).

8. The binocular optical locator according to claim 7, characterized in that: The vertical cross-section of the self-rotating plate (401) is in the shape of an "I" character, and a convex ring (403) adapted to the shape of the self-rotating plate (401) is fixedly connected inside the clamping block (2).

9. The binocular sight locator according to claim 8, characterized in that: A connecting rod (404) is fixedly connected between the two rotating plates (401), and the top edge of the rotating plate (401) located at the bottom is frictionally engaged with the sealing ring (3).

10. The binocular sight locator according to claim 5, characterized in that: The side of the clamping block (2) is an inclined surface, the vertical cross-section of the blocking ring (3) is an arc-shaped structure, and an elastic extrusion column (7) is fixedly connected to the inclined surface of the clamping block (2).

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