An optical device, system based on large field optical design

Abstract

The application provides an optical device and system based on a large field of view optical design, utilizes an existing objective lens, and realizes a larger observation field of view without losing an observation distance by changing a relative position relationship between an objective lens optical axis and a center of an image sensor and a layout of double objective lenses. The application reallocates an imaging position of the image sensor, does not need to replace a high and large target surface image sensor, and has a low cost. The application changes the layout of the double objective lenses, and does not affect a visual experience of an observer.

Description

Technical Field

[0001] This application belongs to the field of optical technology, specifically relating to an optical device and system based on a large field-of-view optical design. Background Technology

[0002] With the iterative upgrades of observation equipment, higher demands have been placed on its observation capabilities, resulting in seemingly contradictory requirements such as a large field of view and a long observation distance. Currently, most observation equipment uses single-path objectives, such as those employing low-latency image intensifiers, image sensors, or infrared devices. Because the dimensions of mainstream image sensors are relatively fixed—that is, the optical image plane size is fixed—and because the focal length is inversely proportional to the tangent of the half-field of view, a large field of view and a long observation distance cannot be simultaneously achieved once the image sensor is selected. Current observation equipment uses a single objective lens layout for comfortable observation and is often used in conjunction with a binocular. That is, information acquired by the same objective lens is observed by the human eye through the binocular. Due to the aforementioned inverse relationship, increasing the field of view will sacrifice the observation distance, which is not conducive to improving product performance and does not meet actual usage needs.

[0003] Therefore, there is an urgent need to develop an optical device or system based on a large field-of-view optical design.

[0004] It should be noted that the above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Utility Model Content

[0005] In view of the above problems, this application provides an optical device based on a large field of view optical design. The technical solution adopted in the embodiments of this application is as follows.

[0006] The first aspect of this application relates to an optical device based on a large field-of-view optical design, comprising: The microscope has two tubes, each with an objective lens assembly at its first end and an eyepiece at its second end. A mounting cavity is provided between the objective lens assembly and the eyepiece. The image sensor and image display module are both housed within the mounting cavity; The image sensor has its imaging center redistributed, with its first image height being n and its second image height being s, where n > s; The optical axis of the objective lens group passes through the imaging center of the image sensor; The image sensors in the two lens barrels are positioned relative to each other according to the location of the first image height; The two lens tubes are fixedly connected by a connector, and the optical axes of the objective lens groups in the two lens tubes extend and intersect along the eyepiece direction; The angle formed by the intersection of the two optical axes is fixed at A; When an image sensor is set, the angle between the overlapping fields of view of the two objective lens groups is smaller than the angle between the overlapping fields of view of the two objective lens groups when no image sensor is set. When the image sensor is set, the maximum field of view of the two objective lens groups is greater than the maximum field of view of the two objective lens groups when the image sensor is not set.

[0007] In one specific implementation, the image display module is disposed between the image sensor and the eyepiece, with the display surface of the image display facing the eyepiece.

[0008] By placing the image display module closer to the eyepiece and the image sensor internally within the body further away from the eyepiece, the overall structure of the device is optimized. This layout effectively improves the structural rigidity and shock resistance of the device, while isolating the heat and potential noise generated by the image sensor during operation from the observer's eye, significantly improving user comfort. Furthermore, this design results in an extremely short and fixed optical path between the display module and the eyepiece, simplifying the optical system design and reducing stray light interference, which is beneficial for obtaining clear, stable, and less distorted images.

[0009] In one specific implementation, the image sensor includes a CMOS image sensor, a low-light image sensor, and an infrared image sensor; one type of image sensor is adapted according to different incident light conditions. When the incident light of the objective lens group is natural light, a CMOS image sensor is suitable for the image sensor. When the incident light of the objective lens group is weak natural light, a low-light image sensor is suitable. When the incident light of the objective lens group is infrared radiation, an infrared image sensor is suitable.

[0010] Different image sensors can be used depending on the requirements.

[0011] In one specific feasible implementation, a light shield is also provided on the part of the lens tube where the eyepiece is located.

[0012] Reduce interference from external light to facilitate user image viewing.

[0013] In a specific feasible implementation, the overlapping field of view angle D of the two objective lens groups is the difference between twice the first field of view angle B when the maximum image height of the objective lens group is s and A.

[0014] Compared to ordinary optical systems, this application has a smaller overlap field of view angle.

[0015] In one specific feasible implementation, the maximum field of view E of the two objective lens groups is the sum of twice the second field of view C when the maximum image height of the objective lens groups is n and A.

[0016] Compared to ordinary optical systems, this application has a larger field of view.

[0017] In one specific feasible implementation, the first image height n is the product of the focal length f of the objective lens group and the tangent tgC of the second field of view C; The second image height s is the product of the focal length f of the objective lens group and the tangent tgB of the first field of view B.

[0018] The image sensor that redistributes the imaging position can enable an optical device based on a large field-of-view optical design of this application to have a smaller overlapping field-of-view angle and a larger field of view.

[0019] In one specific feasible implementation, the objective lens group includes a zoom lens group, a compensating lens group, and an imaging objective lens group; The optical axis passes through the imaging objective group, the compensation lens group, the zoom lens group, and the imaging center of the image sensor.

[0020] The coaxial optical system minimizes off-axis aberrations, ensuring the resolution and uniformity of the full field of view image, while effectively suppressing image shift during zooming, thus improving the system's imaging stability and calibration accuracy.

[0021] In one specific implementation, the imaging center of the image sensor is offset upward relative to the geometric center of its imaging surface.

[0022] The image sensor that redistributes the imaging position can enable an optical device based on a large field-of-view optical design of this application to have a smaller overlapping field-of-view angle and a larger field of view.

[0023] The second aspect of this application relates to an optical system, including an optical device based on a large field-of-view optical design.

[0024] The beneficial effects of the technical solution provided in this application include at least the following: This application provides an optical device based on a large field-of-view optical design. By utilizing existing objective lenses and changing the relative position of the objective lens optical axis to the center of the image sensor, as well as the layout of the dual objective lenses, the field of view is stitched together, achieving a larger field of view without sacrificing the observation distance. The imaging position of the image sensor is redistributed, eliminating the need to replace it with an expensive, larger target surface image sensor, thus reducing costs. The modification of the dual objective lens layout does not affect the observer's visual experience. Attached Figure Description

[0025] Figure 1 This application provides a schematic diagram of an optical device based on a large field-of-view optical design. Figure 2: A schematic diagram of an image sensor with a redistributed imaging center provided in an embodiment of this application; Figure 3 This application provides a schematic diagram of the field of view of an optical device based on a large field of view optical design.

[0026] Explanation of reference numerals in the attached diagram: 1. Lens tube; 2. Objective lens group; 3. Image sensor; 4. Connector; 5. Light hood. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0028] In this document, "multiple" refers to two or more. In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] The following is in conjunction with the appendix Figures 1-3 This application will be described in further detail.

[0031] On the one hand, this application provides an optical device based on a large field-of-view optical design, such as Figure 1As shown, the system includes two lens barrels 1, each with an objective lens group 2 at its first end. The objective lens group 2 includes a zoom lens group, a compensation lens group, and an imaging objective lens group. The optical axis passes through the imaging objective lens group, the compensation lens group, the zoom lens group, and the imaging center of the image sensor 3. This coaxial optical system minimizes off-axis aberrations, ensuring the resolution and uniformity of the full-field-of-view image, while effectively suppressing image shift during zooming, thus improving the system's imaging stability and calibration accuracy.

[0032] An eyepiece is positioned inside the microscope tube 1, away from the first end, and a mounting cavity is provided between the objective lens group 2 and the eyepiece. The image sensor 3 and image display module are both located within the mounting cavity. The image display module is positioned between the image sensor 3 and the eyepiece, with the display surface facing the eyepiece. Placing the image display module closer to the eyepiece and the image sensor 3 further away from the eyepiece optimizes the overall structure. This layout effectively improves the structural rigidity and shock resistance of the device, while isolating the heat and potential noise generated by the image sensor 3 from the observer's eye, significantly improving user comfort. Furthermore, this design makes the optical path between the display module and the eyepiece extremely short and fixed, simplifying the optical system design and reducing stray light interference, which is beneficial for obtaining clear, stable, and less distorted images. A light shield 5 is also provided on the part of the microscope tube 1 where the eyepiece is located to reduce interference from external light and facilitate image observation.

[0033] like Figure 2 As shown, the image sensor 3 has a reassigned imaging center. The focal point of the two dashed lines is the imaging center of the ordinary image sensor, and the intersection of the vertical dashed line and the solid line is the reassigned imaging center. Its first image height is n, and its second image height is s, where n > s. The optical axis of the objective lens group 2 passes through the imaging center of the image sensor 3. The image sensors 3 in the two lens barrels 1 are positioned relative to each other according to their first image heights. The image sensor 3 includes a CMOS image sensor, a low-light image sensor, and an infrared image sensor. One type of image sensor 3 is adapted according to different incident light conditions. When the incident light of the objective lens group 2 is natural light, a CMOS image sensor is used for the image sensor 3. When the incident light of the objective lens group 2 is weak natural light, a low-light image sensor is used for the image sensor 3. When the incident light of the objective lens group 2 is infrared radiation, an infrared image sensor is used for the image sensor 3. Different image sensors 3 can be used as needed.

[0034] The two lens tubes 1 are fixedly connected by connector 4, such as Figure 3As shown, the optical axes of the objective lens groups 2 in the two lens barrels 1 extend and intersect along the eyepiece direction; the angle formed by the intersection of the two optical axes is fixed as A; the overlapping field of view angle of the two objective lens groups 2 when an image sensor 3 is provided is smaller than the overlapping field of view angle of the two objective lens groups 2 when an image sensor 3 is not provided; the overlapping field of view angle D of the two objective lens groups 2 is twice the first field of view angle B when the maximum image height of the objective lens group 2 is s minus the difference with A. Compared with ordinary optical systems, this application has a smaller overlapping field of view angle. The maximum field of view angle of the two objective lens groups 2 when an image sensor is provided is larger than the maximum field of view angle of the two objective lens groups 2 when an image sensor is not provided. The maximum field of view angle E of the two objective lens groups 2 is twice the second field of view angle C when the maximum image height of the objective lens group 2 is n and A. Compared with ordinary optical systems, this application has a larger field of view angle. The first image height n is the product of the focal length f of objective lens group 2 and the tangent tgC of the second field of view C; the second image height s is the product of the focal length f of objective lens group 2 and the tangent tgB of the first field of view B. The image sensor 3, by redistributing the imaging position, enables an optical device based on a large field of view optical design of this application to have a smaller overlapping field of view angle and a larger field of view.

[0035] The imaging center of image sensor 3 is offset upwards relative to the geometric center of its imaging surface, such as... Figure 2 As shown. The image sensor 3, by redistributing the imaging position, can enable an optical device based on a large field-of-view optical design of this application to have a smaller overlapping field-of-view angle and a larger field of view.

[0036] On the other hand, this application provides an optical system, including an optical device based on a large field-of-view optical design.

[0037] This application provides an optical device based on a large field-of-view optical design. Utilizing existing objective lenses, the field of view is stitched together by changing the relative position of the objective lens optical axis to the center of the image sensor and by altering the layout of the two objective lenses, thus achieving a larger field of view without sacrificing observation distance. The imaging position of the image sensor is redistributed, eliminating the need to replace it with an expensive, larger target-area image sensor, resulting in lower costs. The modification to the dual-objective lens layout does not affect the observer's visual experience.

[0038] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An optical device based on a large field of view optical design, characterized in that, include: Two lens tubes (1), each with an objective lens group (2) at its first end and an eyepiece at its farthest end. A mounting cavity is provided between the objective lens group (2) and the eyepiece. The image sensor (3) and the image display module are both located inside the mounting cavity; The image sensor (3) has its imaging center redistributed, its first image height is n, its second image height is s, and n>s; The optical axis of the objective lens group (2) passes through the imaging center of the image sensor (3); The image sensors (3) in the two lens barrels (1) are arranged relative to each other according to the position of the first image height; The two lens tubes (1) are fixedly connected by a connector (4), and the optical axes of the objective lens groups (2) in the two lens tubes (1) extend and intersect along the eyepiece direction; The angle formed by the intersection of the two optical axes is fixed as A; When the image sensor is set, the angle between the overlapping fields of view of the two objective lens groups (2) is smaller than the angle between the overlapping fields of view of the two objective lens groups (2) when the image sensor is not set; The maximum field of view of the two objective lens groups (2) when the image sensor is set is greater than the maximum field of view of the two objective lens groups (2) when the image sensor is not set.

2. An optical device based on a large field optical design according to claim 1, characterized in that: The image display module is disposed between the image sensor (3) and the eyepiece, and the display surface of the image is oriented towards the eyepiece.

3. An optical device based on a large field optical design according to claim 1, characterized in that: The image sensor (3) includes a CMOS image sensor, a low-light image sensor, and an infrared image sensor; one of the image sensors (3) is adapted according to different incident light conditions; When the incident light of the objective lens group (2) is natural light, the image sensor (3) is a CMOS image sensor. When the incident light of the objective lens group (2) is weak natural light, the image sensor (3) is suitable for low-light image sensor. When the incident light of the objective lens group (2) is infrared radiation, the image sensor (3) is an infrared image sensor.

4. An optical device based on a large field optical design according to claim 1, characterized in that: A light shield (5) is also provided on the part of the lens tube (1) where the eyepiece is located.

5. An optical device based on a large field optical design according to claim 1, characterized in that: The overlapping field of view angle D of the two objective lens groups (2) is the difference between twice the first field of view angle B when the maximum image height of the objective lens group (2) is s and A.

6. An optical device based on a large field optical design according to claim 5, characterized in that: The maximum field of view E of the two objective lens groups (2) is the sum of twice the second field of view C when the maximum image height of the objective lens group (2) is n and A.

7. An optical device based on a large field optical design according to claim 6, characterized in that: The first image height n is the product of the focal length f of the objective lens group (2) and the tangent tgC of the second field of view C; The second image height s is the product of the focal length f of the objective lens group (2) and the tangent tgB of the first field of view angle B.

8. An optical device based on a large field optical design according to claim 1, characterized in that: The objective lens group (2) includes a zoom lens group, a compensating lens group, and an imaging objective lens group; The optical axis passes through the optical axis of the imaging objective lens group, the optical axis of the compensation lens group, the optical axis of the zoom lens group, and the imaging center of the image sensor (3).

9. An optical device based on a large field optical design according to claim 8, characterized in that: The imaging center of the image sensor (3) is offset upward relative to the geometric center of its imaging surface.

10. An optical system characterized by: Includes an optical device based on a large field-of-view optical design as described in any one of claims 1 to 9.

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