Imaging equipment for switching small-target-surface camera to large-format lens

Abstract

The invention discloses an imaging device for switching a small-target-surface camera to a large-format lens, and relates to the technical field of magnetic confinement fusion plasma diagnosis, and the imaging device comprises a large-format lens, a relay objective lens group, a preset magnification switching lens, and a camera. Wherein the tail end surface of the large-format lens is connected with one end of the relay objective lens group and is used for imaging an object to be imaged; the other end of the relay objective lens group is connected with the front end surface of the switching lens and is used for transmitting the image of the object to be imaged to the object surface of the switching lens; the tail end surface of the adapter lens is connected with the camera and is used for transmitting the received image of the to-be-imaged object to the camera, and the camera performs shooting imaging; the technical problem that a large-format lens is applied to a small-target-surface machine is solved, the universality of lenses of different specifications on the same industrial camera is improved, and the lens selection range of the industrial camera is expanded.

Description

Technical Field

[0001] The invention relates to the field of magnetic confinement fusion plasma diagnosis technology, and more specifically, to an imaging device in which a small target surface camera is switched to a large-format lens. Background Art

[0002] The visible light imaging system can provide monitoring of magnetic confinement fusion plasma and the interior of the vacuum chamber. Specifically, it can observe the displacement, boundary and interaction between plasma and wall, which is an important diagnosis for maintaining the safe operation of the device. Due to the high magnetic field intensity, high-energy particle radiation and severe line radiation of high-temperature plasma, electronic devices such as cameras (CCD or CMOS) are forced to stay away from the device. Therefore, the imaging system has a design requirement of a long optical path.

[0003] Visible light imaging systems usually use industrial cameras. The target size of some industrial cameras is relatively small, less than 4 / 3 inches, such as 1 / 2 inch, 2 / 3 inch, 1 inch, 1.1 inch, etc. The lenses of industrial cameras matching these target formats are often selected from these specifications. In fact, some lenses with larger target formats, such as half-frame and full-frame lenses, have excellent imaging quality and strict control over various aberrations (such as spherical aberration, coma, astigmatism, field curvature, distortion, axial chromatic aberration and vertical chromatic aberration). If these larger-format lenses are directly connected to industrial cameras with smaller target sizes, the available field of view angle will be greatly reduced due to "image field cutting". Therefore, solving the technical problem of applying larger-format lenses to small-target cameras without almost losing the field of view of large-format lenses will expand the scope of lens selection for industrial cameras and thus reduce the cost of the entire imaging system. Summary of the invention

[0004] The purpose of the present invention is to provide an imaging device for converting a small-format camera to a large-format lens, which can solve the technical problem of applying a larger-format lens to a small-format camera without almost losing the field of view of the large-format lens, improve the versatility of lenses of different specifications on the same industrial camera, expand the lens selection range of the industrial camera, and thus reduce the cost of the entire imaging system.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] The present application provides an imaging device for converting a small-target camera to a large-format lens, comprising a large-format lens, a relay objective lens group, a conversion lens with a preset magnification, and a camera, wherein:

[0007] The rear end face of the large format lens is connected to one end of the relay objective lens group and is used to image the object to be imaged;

[0008] The other end of the relay objective lens group is connected to the front end surface of the transfer lens and is used to transmit the image of the object to be imaged to the object surface of the transfer lens;

[0009] The rear end face of the adapter lens is connected to the camera and is used to transmit the received image of the object to be imaged to the camera, so that the camera can shoot and form the image.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Further, the above-mentioned relay objective lens group includes a first lens group unit and a second lens group unit, wherein:

[0012] The first lens group unit includes lens a and lens b connected to each other, and the large-format lens is connected to lens a.

[0013] Furthermore, the lens a and the lens b are symmetrically placed along the optical axis.

[0014] Furthermore, the second lens group unit comprises a lens c and a lens d connected to each other, the lens d is connected to a transfer lens, and the lens c is connected to the lens b.

[0015] Furthermore, the lens c and the lens d are symmetrically placed along the optical axis.

[0016] Furthermore, the optical paths among the large-format lens, relay objective lens group, adapter lens and camera are fixed by a precise optical-mechanical structure.

[0017] Furthermore, focusing between the large-format lens, relay objective lens group, adapter lens and camera is achieved through a fine thread structure.

[0018] Furthermore, the imaging method of the above imaging device is based on dual telecentric relay optics, or based on macro relay optics.

[0019] Furthermore, when the imaging mode of the above-mentioned imaging device is based on dual-telecentric relay optics, the relay objective lens group and the adapter objective lens are dual-telecentric optical lenses, and the large-format lens is an image-side telecentric lens.

[0020] Furthermore, when the imaging method of the above-mentioned imaging device is based on macro relay optics, the relay objective lens group and the adapter objective lens are macro optical lenses, and the large-format lens has no image-side telecentricity requirement.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] In the present application, a large-format lens is used to image the object to be imaged and transmit it to a relay objective lens group. The other end of the relay objective lens group is connected to the front end surface of the adapter lens. The relay objective lens group transmits the image of the object to be imaged to the object surface of the adapter lens. Since the rear end surface of the adapter lens is connected to the camera, the adapter lens transmits the received image of the object to be imaged to the camera, and finally the camera takes the image. Under the condition of almost no loss of the field of view of the large-format lens, the technical problem of applying a larger-format lens to a small-target camera is solved, the lens selection range of industrial cameras is expanded, and the cost of the entire imaging system is reduced.

[0023] In the present application, the provided device can realize imaging of a small target camera by converting a large-format lens, thereby solving the technical problem of using a larger-format lens on a small target camera, improving the versatility of lenses of different specifications on the same industrial camera, and expanding the lens selection range of industrial cameras; it can not only be directly applied to the field of magnetic confinement fusion plasma, but also can be used as a tool for long optical path image transmission and is also suitable for other imaging fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0025] Figure 1 FIG. 4 is a connection diagram of an imaging device in an embodiment of the present invention.

[0026] Marks and corresponding parts names in the attached drawings:

[0027] 1. Large format lens; 2. Relay objective lens group; 3. Adapter lens; 4. Camera. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the embodiments of the present invention, it should be noted that if the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does 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 a limitation on the present invention.

[0032] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, "plurality" means at least 2.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1: In order to solve the technical problem of applying a large-format lens to a small-target camera and minimize the loss of the field of view of the large-format lens, this embodiment provides an imaging device for converting a small-target camera to a large-format lens, which improves the versatility of lenses of different specifications on the same industrial camera, can expand the lens selection range of industrial cameras, and thus reduce the cost of the entire imaging system. The imaging device includes: a large-format lens 1, a relay objective lens group 2, a conversion lens 3 with a preset magnification, and a camera 4, wherein:

[0036] The rear end face of the large-format lens 1 is connected to one end of the relay objective lens group 2 and is used to image the object to be imaged; the other end of the relay objective lens group 2 is connected to the front end face of the adapter lens 3 and is used to transmit the image of the object to be imaged to the object plane of the adapter lens 3; the rear end face of the adapter lens 3 is connected to the camera 4 and is used to transmit the received image of the object to be imaged to the camera 4, and the camera 4 takes pictures and images.

[0037] Optionally, the relay objective lens group 2 comprises a first lens group unit and a second lens group unit, wherein:

[0038] The first lens group unit includes a lens a and a lens b connected to each other, and a large-format lens 1 is connected to the lens a.

[0039] Optionally, the lens a and the lens b are symmetrically placed along the optical axis.

[0040] Optionally, the second lens group unit includes a lens c and a lens d connected to each other, the lens d is connected to the adapter lens 3, and the lens c is connected to the lens b.

[0041] Optionally, the lens c and the lens d are symmetrically placed along the optical axis.

[0042] Optionally, the optical paths among the large-format lens 1 , the relay objective lens group 2 , the adapter lens 3 and the camera 4 are fixed by a precise optical-mechanical structure.

[0043] Optionally, focusing among the large-format lens 1 , the relay objective lens group 2 , the adapter lens 3 and the camera 4 is achieved through a fine thread structure.

[0044] Specifically, the imaging principle is as follows Figure 1 As shown; the imaging device includes a large-format lens 1, a relay objective lens group 2, a transfer lens 3 with a certain magnification and a camera 4, such as Figure 1 As shown; the relay lens group includes lens a ( Figure 1 2.1.1 in), lens b( Figure 1 2.1.2), lens c( Figure 1 2.2.1) and lens d( Figure 1 2.2.2 in the figure); wherein lens a2.1.1 and lens b2.1.2 are placed symmetrically along the optical axis to form a lens group unit ( Figure 1 2.1 in the figure, i.e. the first lens group unit; lens c2.2.1 and lens d2.2.2 are symmetrically placed along the optical axis to form a lens group unit ( Figure 1 2.2) in the figure, namely the second lens group unit.

[0045] Specifically, the large-format lens 1 is connected to the lens a2.1.1, the lens d2.2.2 is connected to the adapter lens 3 with a certain magnification, and the adapter lens 3 is connected to the camera 4; the entire optical path is fixed by a precise optical-mechanical structure, and a fine thread structure is used between the lenses for focusing; wherein, the object side is imaged by the large-format lens 1, and the image is transmitted to the object plane of the adapter lens 3 through the relay objective lens group 2, and finally imaged to the chip of the camera 4 through the adapter lens 3, and the image is captured by the camera 4.

[0046] In this embodiment, the imaging mode of the above-mentioned imaging device is based on dual telecentric relay optics. When the imaging mode of the above-mentioned imaging device is based on dual telecentric relay optics, the relay objective lens group 2 and the adapter objective lens are dual telecentric optical lenses, and the large-format lens 1 is an image-side telecentric lens.

[0047] Among them, when the imaging mode of the imaging device is based on double telecentric relay optics, the relay objective lens group 2 and the adapter objective lens are double telecentric optical lenses, and the front large-format lens 1 is an image-side telecentric lens; the specific implementation case of this imaging mode is: the target surface of the camera 4 is 1 inch, the magnification of the adapter objective lens is 0.75×, and the lens matches the 1-inch target surface of the camera 4; the double telecentric relay objective lens group 2 matches the 4 / 3-inch target surface, so the front large-format lens 1 is a 4 / 3-inch image-side telecentric lens; the double telecentric lens a2.1.1 and the double telecentric lens b2.1.2 have the same magnification (0.5×) and are placed symmetrically along the optical axis, forming a relay objective lens group 2 unit a2.1. The double telecentric lens c2.2.1 and the double telecentric lens d2.2.2 also have the same magnification (0.5×) and are placed symmetrically along the optical axis to form a relay objective lens group 2 unit b2.2; the working F number of the adapter objective lens is 3, the working F number of the relay objective lens group 2 is 4, and the image side F number of the front large format lens 1 is 4; the front large format lens 1 can be replaced with lenses of different focal lengths according to different field of view requirements.

[0048] Embodiment 2: In order to solve the technical problem of applying a large-format lens to a small-target camera and minimize the loss of the field of view of the large-format lens, this embodiment provides an imaging device for converting a small-target camera to a large-format lens, which improves the versatility of lenses of different specifications on the same industrial camera, can expand the lens selection range of industrial cameras, and thus reduce the cost of the entire imaging system. The imaging device includes: a large-format lens 1, a relay objective lens group 2, a conversion lens 3 with a preset magnification, and a camera 4, wherein:

[0049] The rear end face of the large-format lens 1 is connected to one end of the relay objective lens group 2 and is used to image the object to be imaged; the other end of the relay objective lens group 2 is connected to the front end face of the adapter lens 3 and is used to transmit the image of the object to be imaged to the object plane of the adapter lens 3; the rear end face of the adapter lens 3 is connected to the camera 4 and is used to transmit the received image of the object to be imaged to the camera 4, and the camera 4 takes pictures and images.

[0050] Optionally, the relay objective lens group 2 comprises a first lens group unit and a second lens group unit, wherein:

[0051] The first lens group unit includes a lens a and a lens b connected to each other, and a large-format lens 1 is connected to the lens a.

[0052] Optionally, the lens a and the lens b are symmetrically placed along the optical axis.

[0053] Optionally, the second lens group unit includes a lens c and a lens d connected to each other, the lens d is connected to the adapter lens 3, and the lens c is connected to the lens b.

[0054] Optionally, the lens c and the lens d are symmetrically placed along the optical axis.

[0055] Optionally, the optical paths among the large-format lens 1 , the relay objective lens group 2 , the adapter lens 3 and the camera 4 are fixed by a precise optical-mechanical structure.

[0056] Optionally, focusing among the large-format lens 1 , the relay objective lens group 2 , the adapter lens 3 and the camera 4 is achieved through a fine thread structure.

[0057] Specifically, the imaging principle is as follows Figure 1 As shown; the imaging device includes a large-format lens 1, a relay objective lens group 2, a transfer lens 3 with a certain magnification and a camera 4, such as Figure 1 As shown; the relay lens group includes lens a ( Figure 1 2.1.1 in), lens b( Figure 1 2.1.2), lens c( Figure 1 2.2.1) and lens d( Figure 1 2.2.2 in the figure); wherein lens a2.1.1 and lens b2.1.2 are placed symmetrically along the optical axis to form a lens group unit ( Figure 1 2.1 in the figure, i.e. the first lens group unit; lens c2.2.1 and lens d2.2.2 are symmetrically placed along the optical axis to form a lens group unit ( Figure 1 2.2) in the figure, namely the second lens group unit.

[0058] Specifically, the large-format lens 1 is connected to the lens a2.1.1, the lens d2.2.2 is connected to the adapter lens 3 with a certain magnification, and the adapter lens 3 is connected to the camera 4; the entire optical path is fixed by a precise optical-mechanical structure, and a fine thread structure is used between the lenses for focusing; wherein, the object side is imaged by the large-format lens 1, and the image is transmitted to the object plane of the adapter lens 3 through the relay objective lens group 2, and finally imaged to the chip of the camera 4 through the adapter lens 3, and the image is captured by the camera 4.

[0059] In this embodiment, the imaging method of the above-mentioned imaging device is based on macro relay optics. When the imaging method of the above-mentioned imaging device is based on macro relay optics, the relay objective lens group 2 and the adapter objective lens are macro optical lenses, and the large-format lens 1 has no image-side telecentricity requirement.

[0060] Wherein, when the imaging mode of the imaging device is based on macro relay optics, the relay objective lens group 2 and the adapter objective lens are macro optical lenses, and the front large-format lens 1 has no image-side telecentricity requirement; the specific implementation case of this imaging mode is: the target surface of the camera 4 is 4 / 3 inches, the magnification of the adapter objective lens is 0.5× and the lens matches the 4 / 3-inch target surface of the camera 4; the relay macro objective lens group matches the full-frame (35mm) target surface, so the front large-format lens 1 is a full-frame fixed-focus lens; the macro lens a2.1.1 and the macro lens b2.1.2 have the same magnification (1×) and are symmetrically placed along the optical axis, forming a relay objective lens group 2 unit a2.1. The macro lens c2.2.1 and the macro lens d2.2.2 also have the same magnification (1×) and are symmetrically placed along the optical axis, forming a relay objective lens group 2 unit b2.2. The working F number of the adapter objective lens is 1.5, the working F number of the relay objective lens group 2 is 3, and the image side F number of the front large-format lens 1 is 3; the front large-format lens 1 can be replaced with lenses of different focal lengths according to different field of view requirements.

[0061] Specifically, this imaging system solves the technical problem of using a larger format lens on a small target camera, which will expand the lens selection range of industrial cameras and reduce the cost of the entire imaging system. This imaging device can not only be directly applied to the field of magnetic confinement fusion plasma, but also be used as a tool for long optical path image transmission in other imaging fields.

[0062] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An imaging device for converting a small-format camera to a large-format lens, characterized in that: Includes large format lenses, relay objective lens sets, adapter lenses with preset magnifications and cameras, including: The rear end surface of the large-format lens is connected to one end of the relay objective lens group and is used to image the object to be imaged; The other end of the relay objective lens group is connected to the front end surface of the transfer lens and is used to transmit the image of the object to be imaged to the object surface of the transfer lens; The rear end surface of the transfer lens is connected to the camera and is used to transmit the received image of the object to be imaged to the camera, and the camera takes the image.

2. The imaging device of claim 1, wherein: The relay objective lens group comprises a first lens group unit and a second lens group unit, wherein: The first lens group unit includes a lens a and a lens b connected to each other, and the large-format lens is connected to the lens a.

3. The imaging device of claim 2 for converting a small-format camera to a large-format lens, characterized in that: The lens a and the lens b are symmetrically placed along the optical axis.

4. The imaging device of claim 2 for converting a small-format camera to a large-format lens, characterized in that: The second lens group unit includes a lens c and a lens d connected to each other, the lens d is connected to the transfer lens, and the lens c is connected to the lens b.

5. The imaging device for converting a small-format camera to a large-format lens according to claim 4, characterized in that: The lens c and the lens d are symmetrically placed along the optical axis.

6. The imaging device for converting a small-format camera to a large-format lens according to claim 1, characterized in that: The optical paths among the large-format lens, the relay objective lens group, the adapter lens and the camera are fixed by a precise optical-mechanical structure.

7. The imaging device of claim 1 for converting a small-format camera to a large-format lens, characterized in that: The focusing between the large-format lens, the relay objective lens group, the adapter lens and the camera is achieved through a fine thread structure.

8. The imaging device of claim 1 for converting a small-format camera to a large-format lens, characterized in that: The imaging mode of the imaging device is based on dual telecentric relay optics or macro relay optics.

9. The imaging device of claim 8, wherein: When the imaging mode of the imaging device is based on double telecentric relay optics, the relay objective lens group and the adapter objective lens are double telecentric optical lenses, and the large-format lens is an image-side telecentric lens.

10. The imaging device of claim 8, wherein: When the imaging mode of the imaging device is based on macro relay optics, the relay objective lens group and the adapter objective lens are macro optical lenses, and the large-format lens has no image-side telecentricity requirement.

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