Refrigeration camera with built-in electric filter wheel

Abstract

The invention relates to a refrigeration camera with a built-in electric filter wheel, and relates to the technical field of astronomical cameras, the refrigeration camera comprises a camera housing, and an image sensor, a filter rotating cage and a control mainboard arranged in the camera housing; a refrigerator is arranged on the image sensor, and a radiator is arranged on the refrigerator; the filter rotating cage is arranged on the outer side of the image sensor in a sleeving manner, the axial direction of the filter rotating cage is perpendicular to the optical axis of the image sensor, the optical axis of the image sensor and the filter rotating cage are correspondingly arranged in a radial collinear manner, and a plurality of filters are arranged on the outer side wall of the filter rotating cage and are sequentially arranged at intervals in the circumferential direction of the filter rotating cage; the filter rotating cage is rotationally connected with the camera shell, and a switching driver is also arranged in the camera shell; the image sensor, the refrigerator, the radiator and the switching driver are all electrically connected with the control mainboard. According to the invention, the imaging light path of the refrigeration camera can be prevented from being asymmetrically shielded, so that the imaging quality of the refrigeration camera is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of astronomical cameras, and particularly to a refrigeration camera with a built-in motorized filter wheel. BACKGROUND

[0002] A refrigeration camera reduces the temperature of an image sensor through active refrigeration technology to suppress thermal noise and improve signal-to-noise ratio, and is widely used in scientific imaging fields such as astronomical photography, biological fluorescence imaging, and chemiluminescence analysis, which have very high requirements for image quality.

[0003] In the field of astronomical photography, in order to obtain information of a target in different spectral bands, different optical filters need to be switched in the optical path of the camera. Therefore, some existing refrigeration cameras integrate a motorized filter wheel, which can realize the switching function of different filters.

[0004] At present, a common motorized filter wheel mainly includes a rotatable filter disc, a plurality of filters are installed on the filter disc, and the filter disc is driven to rotate around the central axis by a motor. The rotation axis of the filter disc is parallel to the surface normal direction of the image sensor of the camera (i.e. the optical axis direction of the optical path), so that different filters are switched into the imaging optical path in turn.

[0005] For the related technology in the above, since the image sensor of the camera needs to be aligned with only one filter on the filter disc each time, and a plurality of filters are arranged on the filter disc, the filter disc is arranged eccentrically relative to the optical axis of the camera. Therefore, after the motorized filter wheel is installed on the camera, the motorized filter wheel will significantly increase the outer contour of the camera due to the eccentric arrangement, so that the motorized filter wheel on the camera will intrude into the imaging optical path and produce asymmetric shading. In particular, in a prime focus telescope, the motorized filter wheel will produce asymmetric shading in the imaging optical path after intruding into the imaging optical path, which will cause the photographed star points to produce asymmetric star rays or halos, thereby significantly affecting the imaging quality. SUMMARY

[0006] The present application provides a refrigeration camera with a built-in motorized filter wheel, which aims to avoid asymmetric shading of the imaging optical path of the refrigeration camera, thereby improving the imaging quality of the refrigeration camera.

[0007] The refrigeration camera with a built-in motorized filter wheel provided by the present application adopts the following technical solution: The application discloses a refrigeration camera with a built-in electric filter wheel, which comprises a camera shell, an image sensor, a filter rotating cage and a control mainboard arranged in the camera shell, a refrigerator is arranged on the image sensor, and a heat sink is arranged on the refrigerator; the filter rotating cage is arranged outside the image sensor, the axial direction of the filter rotating cage is perpendicular to the optical axis of the image sensor, and the optical axis of the image sensor is arranged in a corresponding radial line with the filter rotating cage, a plurality of filter pieces are arranged on the outer wall of the filter rotating cage, and the filter pieces are arranged in sequence along the circumferential direction of the filter rotating cage; the filter rotating cage is rotationally connected with the camera shell, and a switching driver for driving the filter rotating cage to rotate along the circumferential direction of the filter rotating cage is further arranged in the camera shell; the image sensor, the refrigerator, the heat sink and the switching driver are electrically connected with the control mainboard.

[0008] By adopting the technical scheme, firstly, the cooperation of the camera shell, the image sensor, the refrigerator, the heat sink and the control mainboard can meet the basic functions of the refrigeration camera.

[0009] Secondly, on this basis, the filter rotating cage is arranged outside the image sensor, and the axial direction of the filter rotating cage is perpendicular to the optical axis of the image sensor, so that when the switching driver drives the filter rotating cage to rotate, the filter pieces on the filter rotating cage can be sequentially switched to be arranged opposite to the image sensor, thereby realizing the switching function of the filter pieces.

[0010] Since the optical axis of the image sensor is arranged in a corresponding radial line with the filter rotating cage, the filter rotating cage is symmetrically arranged along the optical axis direction of the image sensor, and the symmetric arrangement can avoid asymmetric shielding of the imaging light path of the refrigeration camera, thereby eliminating the asymmetric star rays or halation of the star points in the shooting, and further improving the imaging quality of the refrigeration camera.

[0011] Meanwhile, the problem of imbalance of the refrigeration camera caused by eccentric arrangement can be eliminated, and the stability of the refrigeration camera in use is improved, so that the refrigeration camera is suitable for the field of astronomical photography and other fields with high requirements on system balance.

[0012] Optionally, the filter rotating cage comprises a plurality of fixed frames, the fixed frames are arranged in sequence along the circumferential direction of the image sensor, and the fixed frames surround the image sensor, and adjacent two fixed frames are fixedly connected; the fixed frames are arranged in one-to-one correspondence with the filter pieces, and the filter pieces are arranged on the corresponding fixed frames.

[0013] By adopting the technical scheme, based on the structural design of the filter rotating cage, the filter rotating cage is in a polyhedral structure under the cooperation of a plurality of fixed frames, which can improve the rigidity of the filter rotating cage structure. Meanwhile, since each filter plate is installed through the corresponding fixed frame, the stability of the filter plate installation can be improved. Therefore, such a design can effectively resist the deformation of the refrigeration camera caused by gravity in different shooting postures, ensuring the position accuracy and posture stability of the filter plate in the optical path. Meanwhile, each fixed frame provides an independent and stable mounting base for the corresponding filter plate, ensuring the repeated positioning accuracy of the filter switching.

[0014] Optionally, the filter plate is detachably connected with the corresponding fixed frame.

[0015] By adopting the technical scheme, the detachable connection design between the filter plate and the fixed frame enables the user to replace or combine different types of filter plates according to different shooting targets and needs. Meanwhile, such a design also facilitates the maintenance of the refrigeration camera and facilitates the replacement of damaged filter plates.

[0016] Optionally, the switching driver includes a driving wheel and a driving motor, the driving end of the driving motor is coaxially connected with the driving wheel, the axial direction of the driving wheel is parallel to the axial direction of the filter rotating cage, and the driving wheel is in transmission connection with the filter rotating cage.

[0017] By adopting the technical scheme, the switching driver is designed through the driving wheel and the driving motor, wherein the driving wheel is in transmission connection with the filter rotating cage to transmit torque, which realizes the function of the switching driver. Such a switching driver has a simple structure, stable transmission and small space occupation.

[0018] Optionally, the heat sink is located in the filter rotating cage.

[0019] By adopting the technical scheme, the position of the heat sink can avoid interference between the heat sink and the filter rotating cage, thereby facilitating the disassembly and assembly of the filter rotating cage.

[0020] Optionally, the heat sink includes a sealed heat dissipation pipeline, the cold end of the refrigerator is attached to the image sensor, the hot end of the refrigerator is attached to the outer side wall of the sealed heat dissipation pipeline, and both ends of the sealed heat dissipation pipeline are connected with the inner side wall of the camera shell; the air inlet and the air outlet are formed on the outer side wall of the camera shell, and the air inlet, the sealed heat dissipation pipeline and the air outlet are sequentially communicated.

[0021] By adopting the technical scheme, the sealed heat dissipation pipeline is designed to form an independent and closed heat dissipation air passage in the refrigeration camera, and the heat dissipation air passage is isolated from the optical area in the refrigeration camera, so that the cold air flow outside the refrigeration camera can pass through the heat dissipation air passage to realize the heat dissipation function. In this process, the sealed heat dissipation pipeline can effectively prevent dust, moisture and other impurities that may be carried in the air flow from polluting the surface of the precision optical element, thereby ensuring the long-term imaging quality and reliability of the refrigeration camera.

[0022] Optionally, the heat sink further comprises a mounting box and a sealing cover, one side of the mounting box is open, the other side is connected with the sealed heat dissipation pipeline; the sealing cover is detachably connected with the mounting box, and the sealing cover closes the opening of the mounting box, and a sealed cavity is formed between the sealing cover and the mounting box; the image sensor and the refrigerator are located in the sealed cavity, and the hot end of the refrigerator is attached to the corresponding inner side wall of the mounting box.

[0023] By adopting the technical scheme, based on the cooperation design of the mounting box and the sealing cover, the image sensor and the refrigerator are packaged in the sealed cavity, thereby providing a micro environment isolated from the outside world and capable of maintaining dryness and cleanliness for the image sensor, which can improve the working stability of the image sensor.

[0024] Optionally, the heat sink further comprises an active fan, the active fan is arranged on the inner side wall of the camera shell, one end of the sealed heat dissipation pipeline is connected with the inner side wall of the camera shell, the other end is connected with the active fan, and the air inlet, the active fan, the sealed heat dissipation pipeline and the air outlet are sequentially communicated.

[0025] By adopting the technical scheme, the active fan can actively suck the cold air flow outside the refrigeration camera into the sealed heat dissipation pipeline, so as to accelerate the flow rate of the air flow, thereby improving the heat dissipation efficiency.

[0026] Optionally, a plurality of heat dissipation air channels are arranged in the sealed heat dissipation pipeline, the air inlet, the heat dissipation air channels and the air outlet are sequentially communicated, and the plurality of heat dissipation air channels are independently arranged.

[0027] By adopting the technical scheme, a plurality of independent heat dissipation air channels are arranged in the sealed heat dissipation pipeline, so that after the cold air flow enters the sealed heat dissipation pipeline, the cold air flow will enter different heat dissipation air channels, which can increase the heat exchange surface area of the sealed heat dissipation pipeline and the cold air flow, thereby improving the heat dissipation efficiency.

[0028] Optionally, a wind guide groove is further formed on the inner side wall of the sealed heat dissipation pipeline, the wind guide groove penetrates the sealed heat dissipation pipeline towards one end of the air inlet, and the air inlet and the plurality of heat dissipation air channels are communicated with the wind guide groove.

[0029] By adopting the technical scheme, based on the opening of the air guide groove, on the one hand, the inlet of the sealed heat dissipation pipeline can be increased, so that the air inlet of the sealed heat dissipation pipeline is larger. On the other hand, the air guide groove can comb and guide the airflow entering the sealed heat dissipation pipeline, so that the airflow is more evenly distributed to each heat dissipation air duct, avoiding the airflow from taking a shortcut or forming a dead angle in some areas, thereby enhancing the overall heat dissipation effect.

[0030] In summary, the present application has at least one of the following beneficial technical effects: 1. The filter cage of the present application can avoid asymmetrically blocking the imaging light path of the refrigeration camera, thereby eliminating the asymmetric star rays or halation of the photographed star points, and further improving the imaging quality of the refrigeration camera.

[0031] 2. The filter cage and the switching drive are cooperatively designed, and during the switching of the filter piece, the filter piece can produce an inclination angle relative to the optical axis of the image sensor. This feature can be used to fine-tune the central transmission wavelength of the filter piece, thereby expanding the function of the refrigeration camera in spectral detection without increasing hardware, and improving the scientific research application value.

[0032] 3. The structure design of the filter cage improves the rigidity of the filter cage itself and the stability of the filter piece installation, thereby effectively resisting the deformation of the refrigeration camera caused by gravity in different shooting postures, ensuring the position accuracy and posture stability of the filter piece, and improving the imaging quality and stability of the refrigeration camera.

[0033] 4. The structure design of the heat sink can effectively prevent the dust, moisture and other impurities that may be carried in the heat dissipation airflow from polluting the surface of the precision optical element, ensuring the long-term imaging quality and reliability of the refrigeration camera. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of the refrigeration camera of the present application.

[0035] Figure 2 is a schematic diagram of the cross-sectional structure of the refrigeration camera of the present application.

[0036] Figure 3 is a schematic diagram of the exploded structure of the refrigeration camera of the present application.

[0037] Figure 4 is a schematic diagram of the overall structure of the filter cage, filter piece and switching drive of the present application.

[0038] Figure 5 is a schematic diagram of the overall structure of the filter cage of the present application.

[0039] Figure 6 is the overall structure schematic diagram of the heat sink of the present application.

[0040] Figure 7 is the overall structure schematic diagram of the heat sink, the refrigeration device and the image sensor of the present application.

[0041] Figure 8 is the overall structure schematic diagram of the sealed heat dissipation pipeline of the present application.

[0042] Figure 9 is the overall structure schematic diagram of the refrigeration camera of the present application from another perspective.

[0043] In the figure, 1, camera shell; 11, sleeve; 111, air inlet; 112, air outlet; 12, front cover; 13, rear cover; 2, image sensor; 3, filter rotating cage; 31, fixing ring; 32, fixing frame; 4, control mainboard; 5, refrigeration device; 6, heat sink; 61, mounting box; 62, sealed upper cover; 63, sealed cavity; 64, sealed heat dissipation pipeline; 641, heat dissipation base plate; 642, heat dissipation fin; 643, heat dissipation air duct; 644, air path sealing cover; 6441, air guide groove; 65, active fan; 7, filter piece; 8, switching driver; 81, drive wheel; 82, drive motor. DETAILED DESCRIPTION

[0044] The following will be described in detail with reference to the accompanying drawings. Figure 1 - the accompanying drawings Figure 9 , the present application will be further described in detail.

[0045] A refrigeration camera with built-in electric filter wheel, referring to Figure 1 and Figure 2 , comprising a camera shell 1, the camera shell 1 is provided with an image sensor 2, a filter rotating cage 3 and a control mainboard 4. The image sensor 2 is provided with a refrigeration device 5, and the refrigeration device 5 is provided with a heat sink 6. The filter rotating cage 3 is sleeved outside the image sensor 2, the axial direction of the filter rotating cage 3 is perpendicular to the optical axis of the image sensor 2, the optical axis of the image sensor 2 is arranged along the axial direction of the camera shell 1, and a plurality of filter pieces 7 are arranged on the outer wall of the filter rotating cage 3 and are uniformly and sequentially arranged along the circumferential direction of the filter rotating cage 3. The filter rotating cage 3 is rotationally connected with the camera shell 1, and the camera shell 1 is further provided with a switching driver 8, and the switching driver 8 is in transmission connection with the filter rotating cage 3. The image sensor 2, the refrigeration device 5, the heat sink 6 and the switching driver 8 are all electrically connected with the control mainboard 4.

[0046] Referring to Figure 2When the camera is used for shooting, light enters the camera housing 1 and then irradiates the image sensor 2 along the optical axis of the image sensor 2. In this process, since the filter rotating cage 3 is sleeved outside the image sensor 2, the light passes through the filter rotating cage 3, so that the light passes through the corresponding filter piece 7 on the filter rotating cage 3, so that the camera can obtain image information in the corresponding spectral band, and meet the function of the camera. In this process, the cooler 5 works to lower the temperature of the image sensor 2, so as to effectively suppress the thermal noise generated by the image sensor 2 in long-time exposure, thereby significantly improving the image signal-to-noise ratio and ensuring the image shooting quality of the camera. At the same time, the heat sink 6 can continuously dissipate heat for the cooler 5 to ensure that the cooler 5 can continuously work.

[0047] With reference to Figure 2 Due to the arrangement of the switching driver 8, the filter rotating cage 3 can rotate, and with the rotation of the filter rotating cage 3, different filter pieces 7 on the filter rotating cage 3 are switched to be arranged opposite to the image sensor 2 in turn, so that the light can pass through different filter pieces 7, thereby obtaining image information in different spectral bands. Therefore, the arrangement of the filter rotating cage 3 can realize the switching function of the filter pieces 7, and further enable the camera to obtain image information in different spectral bands.

[0048] With reference to Figure 2 In the process of switching the filter pieces 7, the switching driver 8 can control the rotation angle of the filter rotating cage 3, so that the corresponding filter piece 7 is not arranged opposite to the image sensor 2, that is, the corresponding filter piece 7 has an inclination angle relative to the optical axis of the image sensor 2, which can realize the fine adjustment function of the central transmission wavelength of the corresponding filter piece 7, thereby greatly improving the spectral detection accuracy and flexibility of the camera in specific application scenarios. For example, when astronomical narrowband photography is performed, the user can fine-tune the inclination angle of the filter piece 7 to accurately match the emission spectral line shifted due to the Doppler effect of the target celestial body, so as to maximize the reception of effective signals. This design expands the functional range of a single filter piece 7 without adding additional filter piece 7 hardware, thereby making the camera of the present application have higher functional value and research application potential.

[0049] With reference to Figure 1 And Figure 2 The camera housing 1 comprises a sleeve 11, one end of the sleeve 11 is provided with a front cover 12, the other end is provided with a rear cover 13, and the front cover 12 and the rear cover 13 both seal the sleeve 11, so that an installation space is formed between the front cover 12, the sleeve 11 and the rear cover 13, and the image sensor 2, the filter rotating cage 3 and the control mainboard 4 are all located in the installation space.

[0050] With reference to Figure 2 And Figure 3In the embodiment, a light inlet hole is formed in the center of the front cover 12, and the light inlet hole is arranged in axial alignment with the image sensor 2 along the sleeve 11. With the light inlet hole, light can enter the installation space along the optical axis of the image sensor 2, and thus the image sensor 2 can receive the light for image capturing.

[0051] With reference to Figure 2 and Figure 3 In the embodiment, a light inlet lens is mounted on the front cover 12, and the light inlet lens seals the light inlet hole. Thus, the arrangement of the light inlet lens can realize the sealing of the installation space and ensure the sealing of the camera housing 1.

[0052] With reference to Figure 2 and Figure 3 The image sensor 2 is arranged in axial spacing with the front cover 12 along the sleeve 11, so as to form a filter mounting gap between the image sensor 2 and the front cover 12.

[0053] With reference to Figure 2 and Figure 3 The filter rotating cage 3 is sleeved outside the image sensor 2, and the optical axis of the image sensor 2 is arranged in corresponding radial direction of the filter rotating cage 3. The axial direction of the filter rotating cage 3 is arranged perpendicularly to the axial direction of the sleeve 11, and the axial direction of the sleeve 11 is arranged in the direction of the optical axis of the image sensor 2. The filter rotating cage 3 is rotatably connected to the inner wall of the sleeve 11 through a thin-wall bearing at both ends of the axial direction of the filter rotating cage 3.

[0054] Based on the position design of the filter rotating cage 3, the image sensor 2 is arranged in axial alignment with the inner wall of the filter rotating cage 3. Thus, when the filter rotating cage 3 rotates, the plurality of filter lenses 7 mounted on the filter rotating cage 3 can pass through the filter mounting gap between the image sensor 2 and the front cover 12 in sequence, so that the plurality of filter lenses 7 can be switched to be in axial alignment with the image sensor 2, thereby realizing the switching function of the filter lenses 7.

[0055] In addition, the image sensor 2 is arranged inside the filter rotating cage 3, the optical axis of the image sensor 2 is arranged in corresponding radial direction of the filter rotating cage 3, and the axial direction of the sleeve 11 is arranged in the direction of the optical axis of the image sensor 2. Thus, a symmetrical layout is formed in the cooling camera, so that the overall structure of the cooling camera is compact, the center of gravity is centralized, and the problem of system imbalance caused by eccentric mass is avoided. At the same time, such symmetrical structure can prevent asymmetric shielding of the imaging light path, so as to effectively eliminate the phenomenon of asymmetric star rays and other factors affecting the imaging quality caused by the shooting star points.

[0056] With reference to Figure 4 and Figure 5In the embodiment, the filter rotating cage 3 comprises two fixed rings 31 and a plurality of fixed frames 32. The two fixed rings 31 are coaxially and spaced apart. The fixed frames 32 are located between the two fixed rings 31. The length direction of the fixed frames 32 is along the spacing direction of the two fixed rings 31. The fixed frames 32 are connected with the corresponding fixed rings 31 on both sides along the length direction thereof. The plurality of fixed frames 32 are sequentially and uniformly spaced apart along the circumferential direction of the fixed rings 31, and the plurality of fixed frames 32 are arranged in a circular ring, and the adjacent two fixed frames 32 are fixedly connected. The two fixed rings 31 and the plurality of fixed frames 32 are integrally formed.

[0057] With reference to Figure 4 and Figure 5 , the filter pieces 7 are arranged one by one corresponding to the fixed frames 32, and the filter pieces 7 are detachably connected with the corresponding fixed frames 32. Specifically, the filter pieces 7 are connected with the corresponding fixed frames 32 through screws.

[0058] With reference to Figure 2 and Figure 5 , the fixed rings 31 are arranged axially perpendicular to the sleeve 11, and the fixed rings 31 are rotatably connected with the inner wall of the sleeve 11 through thin-wall bearings.

[0059] With reference to Figure 2 and Figure 5 , the image sensor 2 is located in the fixed ring 31, and the image sensor 2 is located between the two fixed rings 31 along the axial direction of the fixed ring 31. The plurality of fixed frames 32 are arranged around the image sensor 2 along the circumferential direction of the image sensor 2.

[0060] The filter rotating cage 3 forms a polyhedral structure through the cooperation of the plurality of fixed frames 32. Such a structure design makes the filter rotating cage 3 have a cage-shaped frame body with considerable thickness. Therefore, compared with the existing thin sheet type filter disc, the filter rotating cage 3 of the present application has significantly improved structural rigidity, can effectively resist deformation caused by gravity in different postures, thereby providing each filter piece 7 with an independent and stable mounting base, ensuring the position accuracy and posture stability of the filter piece 7 in the optical path. Moreover, since the filter piece 7 and the fixed frame 32 adopt a detachable connection mode, it is convenient for users to replace or combine filters according to different shooting needs, which has high flexibility. The design of the two fixed rings 31 and the plurality of fixed frames 32 being integrally formed simplifies the structure, improves the overall rigidity and coaxiality, and ensures the stability and repeated positioning accuracy of the filter rotating cage 3 during rotation.

[0061] With reference to Figure 5 More importantly, the filter rotating cage 3 designed in the present application exhibits great structural compactness advantage when dealing with large size filter pieces 7.

[0062] Specifically, for the existing filter disc structure, since all the filter pieces 7 are arranged in the same plane along the circumference, when the corresponding side length of the filter piece 7 increases L, the radius of the filter disc needs to increase by a corresponding size L, so that the diameter of the filter disc increases by 2L, that is, the diameter of the existing filter disc increases by twice the corresponding side length of the filter piece 7. On this basis, from the perspective of stable installation, the radius of the filter disc should be further increased, so the diameter of the existing filter disc increases by more than twice the amount of increase of the corresponding side length of the filter piece 7.

[0063] In contrast, the filter cage 3 of the present application arranges a plurality of filter pieces 7 into a regular polygonal prism structure. When the number of filter pieces 7 is n and the side length is L, the diameter D of the filter cage 3 of the present application satisfies the relationship D = L / sin(π / n), and for the common configuration of 5 to 7 filter pieces 7 (i.e. n = 5-7), the diameter D is about 1.7L, 2L and 2.3L, respectively. Compared with the large external profile caused by the eccentric structure in the prior art, the present application has obvious advantages in structural compactness, especially when the number of filter pieces is not more than 6, the theoretical diameter is even not larger than that of the prior art. Therefore, even if larger size filter pieces 7 are used, the refrigeration camera of the present application can maintain a relatively compact external profile and excellent structural rigidity.

[0064] This design not only solves the blocking and eccentricity of the center of gravity caused by the existing large-size filter disc, but also ensures the stability and imaging quality of the refrigeration camera under different shooting postures, and is particularly suitable for high-end astronomical photography and scientific imaging fields that require the use of large-size filters.

[0065] Referring to Figure 2 and Figure 4 The switching driver 8 includes a drive wheel 81 and a drive motor 82, the driving end of the drive motor 82 is coaxially connected with the drive wheel 81, and the drive motor 82 is installed on the inner wall of the sleeve 11 or the front cover 12 or the rear cover 13. The axial direction of the drive wheel 81 is parallel and spaced apart from the axial direction of the filter cage 3, and the drive wheel 81 is in transmission connection with the filter cage 3.

[0066] In this embodiment, the drive wheel 81 is a friction wheel, and the outer side wall of the drive wheel 81 abuts against the outer side wall of the filter cage 3.

[0067] Based on the structural design of the switching driver 8, after the control mainboard 4 sends the switching instruction, the driving motor 82 starts and drives the driving wheel 81 to rotate. Since the outer side wall of the driving wheel 81 tightly abuts against the outer side wall of the filter rotating cage 3, the rotation torque of the driving wheel 81 is transmitted to the filter rotating cage 3 through the friction force, so as to drive the filter rotating cage 3 to rotate around its own axis until the target filter piece 7 is switched to the filter mounting gap. This can realize the switching of the filter piece 7, and the switching driver 8 has simple structure, stable transmission and small space occupation.

[0068] In this embodiment, referring to Figure 4 , the outer side wall of the driving wheel 81 abuts against the outer side wall of the fixed frame 32 in the filter rotating cage 3.

[0069] The abutting transmission between the driving wheel 81 and the outer side wall of the fixed frame 32 on the filter rotating cage 3 utilizes the good rigidity and accurate circumferential surface of the fixed frame 32 as a part of the structure of the filter rotating cage 3, so as to ensure that the driving wheel 81 is always in contact with the filter rotating cage 3 during rotation, thereby effectively avoiding the slipping phenomenon and ensuring the accuracy and repeatability of the switching positioning of the filter piece 7.

[0070] In another embodiment, the driving wheel 81 and the filter rotating cage 3 can also be transmitted through a synchronous belt, that is, the synchronous belt is sleeved on the outer side of the driving wheel 81 and the filter rotating cage 3, and the driving wheel 81 and the filter rotating cage 3 are both connected with the synchronous belt transmission. Specifically, the synchronous belt is sleeved on the outer side of the fixed frame 32 in the filter rotating cage 3.

[0071] Therefore, under the structural design of such switching driver 8, the filter rotating cage 3 can be synchronously rotated through the transmission of the synchronous belt, so as to meet the function of the switching driver 8.

[0072] Referring to Figure 2 , the image sensor 2 can adopt a CCD sensor or a CMOS sensor. The refrigerator 5 can adopt a semiconductor refrigerating sheet or a mechanical refrigerator 5. The cold end of the refrigerator 5 is attached to the back plate of the image sensor 2, the hot end of the refrigerator 5 is attached to the heat sink 6, and the refrigerator 5 and the heat sink 6 are both located in the filter rotating cage 3.

[0073] Referring to Figure 2 and Figure 6 , the heat sink 6 includes a mounting box 61 and a sealing upper cover 62. The mounting box 61 is open on the side facing the front cover 12, and the sealing upper cover 62 is detachably connected with the mounting box 61, and the sealing upper cover 62 seals the opening of the mounting box 61. The sealing upper cover 62 and the mounting box 61 are sequentially arranged along the sleeve 11 in the axial direction, and the sealing upper cover 62 is located on the side of the mounting box 61 facing the front cover 12, and the sealing upper cover 62 is arranged opposite to the light inlet hole.

[0074] Referring to Figure 6 andFigure 7 The sealing upper cover 62 and the mounting box 61 form a sealed cavity 63, and the image sensor 2 and the refrigeration device 5 are located in the sealed cavity 63. The image sensor 2 is located on the side of the refrigeration device 5 facing the sealing upper cover 62, and the hot end of the refrigeration device 5 is attached to the corresponding inner side wall of the mounting box 61, and the image sensor 2 and the refrigeration device 5 are detachably connected to the mounting box 61. Specifically, the sealing upper cover 62 and the mounting box 61 are connected by screws, and the image sensor 2 and the refrigeration device 5 are connected to the mounting box 61 by screws.

[0075] Referring to Figure 7 In this embodiment, a light transmission hole is provided through the sealing upper cover 62, the light transmission hole is in communication with the sealed cavity 63, and the image sensor 2 is arranged opposite to the light transmission hole. The sealing upper cover 62 is provided with a light transmission lens, the light transmission lens closes the light transmission hole, and the light transmission lens and the sealing upper cover 62 are connected by screws. The cooperation of the light transmission hole and the light transmission lens on the sealing upper cover 62 ensures that the image sensor 2 can receive light in the case that the mounting box 61 cooperates with the sealing upper cover 62 to realize the sealing protection of the image sensor 2.

[0076] Referring to Figure 2 and Figure 8 The heat sink 6 further comprises a sealed heat dissipation pipeline 64, and the side of the mounting box 61 away from the sealing upper cover 62 is attached to the outer side wall of the sealed heat dissipation pipeline 64, and the mounting box 61 is integrally formed with the sealed heat dissipation pipeline 64.

[0077] Referring to Figure 3 and Figure 9 The sleeve 11 is provided with an air inlet 111 and an air outlet 112 through the side wall, and the air inlet 111 and the air outlet 112 are arranged opposite to each other along the axial direction of the filter rotating cage 3.

[0078] Referring to Figure 8 and Figure 9 The air inlet 111, the sealed heat dissipation pipeline 64 and the air outlet 112 are in communication in sequence, both ends of the sealed heat dissipation pipeline 64 are connected to the inner wall of the sleeve 11, and the air inlet 111 and the air outlet 112 are located in the sealed heat dissipation pipeline 64.

[0079] Based on the arrangement of the sealed heat dissipation pipeline 64, the cold air outside the refrigeration camera can pass through the sealed heat dissipation pipeline 64, thereby realizing the heat dissipation function.

[0080] Referring to Figure 2 and Figure 8 In this embodiment, the sealed heat dissipation pipeline 64 comprises a heat dissipation substrate 641, the heat dissipation substrate 641 is attached to the mounting box 61, and the length direction of the heat dissipation substrate 641 is arranged along the axial direction of the filter rotating cage 3.

[0081] Referring to Figure 2 andFigure 8 The side of the heat dissipation substrate 641 away from the mounting box 61 is provided with a plurality of heat dissipation fins 642, the heat dissipation fins 642 are arranged vertically to the heat dissipation substrate 641, the length direction of the heat dissipation fins 642 is arranged along the length direction of the heat dissipation substrate 641, the plurality of heat dissipation fins 642 are arranged in parallel and at intervals, and the plurality of heat dissipation fins 642 are arranged in sequence along the width direction of the heat dissipation substrate 641. A heat dissipation air duct 643 is formed between two adjacent heat dissipation fins 642, and the plurality of heat dissipation air ducts 643 are arranged independently of each other, and the length direction of the heat dissipation air duct 643 is arranged along the axial direction of the filter rotating cage 3. In this embodiment, the mounting box 61, the heat dissipation substrate 641 and the plurality of heat dissipation fins 642 are integrally formed.

[0082] With reference to Figure 2 and Figure 8 The side of the heat dissipation substrate 641 away from the mounting box 61 is provided with a plurality of heat dissipation fins 642, the heat dissipation fins 642 are arranged vertically to the heat dissipation substrate 641, the length direction of the heat dissipation fins 642 is arranged along the length direction of the heat dissipation substrate 641, the plurality of heat dissipation fins 642 are arranged in parallel and at intervals, and the plurality of heat dissipation fins 642 are arranged in sequence along the width direction of the heat dissipation substrate 641. A heat dissipation air duct 643 is formed between two adjacent heat dissipation fins 642, and the plurality of heat dissipation air ducts 643 are arranged independently of each other, and the length direction of the heat dissipation air duct 643 is arranged along the axial direction of the filter rotating cage 3. In this embodiment, the mounting box 61, the heat dissipation substrate 641 and the plurality of heat dissipation fins 642 are integrally formed.

[0083] With reference to Figure 2 and Figure 8 The sealing heat dissipation pipeline 64 is formed by the cooperation of the heat dissipation substrate 641, the air path sealing cover 644 and the plurality of heat dissipation fins 642, which can form a heat dissipation air duct in the camera housing 1, and the sealing heat dissipation pipeline 64 can isolate the heat dissipation air duct from other spaces inside the refrigeration camera, especially completely isolating the optical region where the image sensor 2, the filter rotating cage 3 and the filter piece 7 are located from the heat dissipation air duct, so that the airflow for heat dissipation can be strictly limited in the sealing heat dissipation pipeline 64, effectively preventing the impurities such as dust and moisture that may be carried in the airflow from polluting the optical region, thereby ensuring the long-term imaging quality and reliability of the camera.

[0084] With reference to Figure 8 and Figure 9On this basis, based on the cooperation of the plurality of heat dissipation fins 642, a plurality of independent heat dissipation air ducts 643 are formed in the sealed heat dissipation pipeline 64, and the air inlet 111, the heat dissipation air ducts 643 and the air outlet 112 are sequentially communicated, so that when heat dissipation is performed, external cold air can enter from the air inlet 111, flow through the heat dissipation air ducts 643 between the plurality of heat dissipation fins 642, and the cold air exchanges heat with the heat dissipation fins 642 during the flow process, absorbs heat, and then becomes hot air and is discharged from the air outlet 112. Therefore, the heat dissipation fins 642 form the heat dissipation air ducts 643 in the sealed heat dissipation pipeline 64, which can increase the contact area between the cold air entering the heat dissipation air ducts and the sealed heat dissipation pipeline 64, thereby improving the heat exchange efficiency and further improving the heat dissipation efficiency.

[0085] With reference to Figure 3 and Figure 9 In this embodiment, the air duct sealing cover 644 is provided with an air guide groove 6441 on the side facing the heat dissipation substrate 641, the air guide groove 6441 penetrates the air duct sealing cover 644 along the length direction of the air duct sealing cover 644 to the side facing the air inlet 111, and the plurality of heat dissipation air ducts 643 are in communication with the air guide groove 6441.

[0086] Based on the provision of the air guide groove 6441 on the air duct sealing cover 644, on the one hand, the inlet of the sealed heat dissipation pipeline 64 can be increased, so that the air inlet amount of the sealed heat dissipation pipeline 64 is larger. On the other hand, the air guide groove 6441 can comb and guide the airflow entering the air inlet 111, so that the airflow is more evenly distributed to each heat dissipation air duct 643, avoiding airflow short circuit or forming dead angles in some areas, thereby improving the utilization efficiency of the entire heat dissipation fin 642 array and enhancing the overall heat dissipation effect.

[0087] With reference to Figure 3 and Figure 6 The heat sink 6 further comprises a driven fan 65, which is arranged on the inner wall of the sleeve 11 and is in communication with the air inlet 111 opposite the driven fan 65. The end of the sealed heat dissipation pipeline 64 facing the air inlet 111 is connected with the inner wall of the sleeve 11, and the other end is connected with the driven fan 65. The driven fan 65 is in communication with the sealed heat dissipation pipeline 64 opposite the driven fan 65.

[0088] When the refrigeration device 5 is working at high power, the external cold air is actively sucked in and forced to blow through the sealed heat dissipation pipeline 64 by the driven fan 65, which can significantly improve the air flow rate and heat exchange efficiency, so as to quickly and efficiently discharge the waste heat generated by the hot end of the refrigeration device 5 to the outside of the refrigeration camera. This ensures that the refrigeration device 5 can maintain a lower hot end temperature, thereby ensuring that its cold end can achieve a lower refrigeration temperature, providing a stable low-temperature working environment for the image sensor 2.

[0089] The implementation principle of the embodiment of the present application is that when image information is collected, external light enters the inside of the camera shell 1 through the light inlet lens on the front cover 12, passes through the corresponding filter lens 7, and is projected onto the image sensor 2, at which time the image sensor 2 realizes image shooting.

[0090] When image information in different spectral bands needs to be collected, the control mainboard 4 sends an instruction to the switching driver 8, the driving motor 82 is started immediately, and the filter lens rotating cage 3 is driven to rotate through the driving wheel 81. With the rotation of the filter lens rotating cage 3, different filter lenses 7 installed on the filter lens rotating cage 3 are switched to the front of the image sensor 2 in turn, so that the refrigeration camera can capture images in different spectral bands. In addition, the control mainboard 4 can accurately control the rotation angle of the driving motor 82 to realize the slight inclination of the filter lens 7, so as to fine-tune the central transmission wavelength of the filter lens 7 and adapt to special observation requirements.

[0091] During image collection, the refrigerator 5 continuously works to pump the heat of the image sensor 2 closely attached to the cold end to the hot end. At the same time, the active fan 65 starts to suck external cold air from the air inlet 111 and force the air to flow through the sealed heat dissipation pipeline 64 composed of the heat dissipation base plate 641, the heat dissipation fin 642 and the air path sealing cover 644. The airflow efficiently takes away the heat on the heat sink 6 in the pipeline and is discharged from the air outlet 112, so as to maintain the low temperature of the hot end of the refrigerator 5, guarantee that the refrigerator 5 can continuously and stably cool the image sensor 2, effectively suppress thermal noise, and ensure high signal-to-noise ratio imaging quality.

[0092] Since the image sensor 2 is placed inside the filter lens rotating cage 3, and the optical axis of the image sensor 2 is perpendicular to the axis of the filter lens rotating cage 3, the filter lens rotating cage 3 is symmetrically arranged along the optical axis. This design not only makes the overall gravity center of the refrigeration camera centralized, improves the installation stability and balance on the astronomical support, but also can prevent the filter lens rotating cage 3 from producing asymmetric shielding to the imaging light path, so as to ensure the quality of the photographed image.

[0093] The embodiments of the specific implementation are the preferred embodiments of the present application, but do not limit the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A refrigerated camera with a built-in motorized filter wheel, characterized in that, include: The camera housing (1) and the image sensor (2), filter rotator (3) and control motherboard (4) disposed within the camera housing (1); The image sensor (2) is provided with a cooler (5), and the cooler (5) is provided with a heat sink (6). The filter cylinder (3) is sleeved on the outside of the image sensor (2). The axial direction of the filter cylinder (3) is perpendicular to the optical axis of the image sensor (2), and the optical axis of the image sensor (2) is radially collinear with the filter cylinder (3). A plurality of filter pieces (7) are provided on the outer wall of the filter cylinder (3), and the plurality of filter pieces (7) are arranged sequentially at intervals along the circumference of the filter cylinder (3). The filter cylinder (3) is rotatably connected to the camera housing (1), and the camera housing (1) is also provided with a switching driver (8) for driving the filter cylinder (3) to rotate in its own circumference. The image sensor (2), the cooler (5), the heat sink (6), and the switching driver (8) are all electrically connected to the control motherboard (4).

2. A refrigerated camera with a built-in motorized filter wheel according to claim 1, characterized in that, The filter rotator (3) includes several fixed frames (32), which are arranged sequentially along the circumference of the image sensor (2) and surround the image sensor (2). Two adjacent fixed frames (32) are fixedly connected. The fixed frames (32) are arranged in a one-to-one correspondence with the filter pieces (7), and the filter pieces (7) are arranged on the corresponding fixed frames (32).

3. A refrigerated camera with a built-in motorized filter wheel according to claim 2, characterized in that, The filter element (7) is detachably connected to the corresponding fixing frame (32).

4. A refrigerated camera with a built-in motorized filter wheel according to claim 1, characterized in that, The switching driver (8) includes a drive wheel (81) and a drive motor (82). The drive end of the drive motor (82) is coaxially connected to the drive wheel (81). The axial direction of the drive wheel (81) is parallel to the axial direction of the filter drum (3), and the drive wheel (81) is connected to the filter drum (3) in a transmission manner.

5. A refrigerated camera with a built-in motorized filter wheel according to claim 1, characterized in that, The radiator (6) is located inside the filter swivel (3).

6. A refrigerated camera with a built-in motorized filter wheel according to claim 1, characterized in that, The radiator (6) includes a sealed heat dissipation pipe (64), the cold end of the cooler (5) is attached to the image sensor (2), the hot end of the cooler (5) is attached to the outer wall of the sealed heat dissipation pipe (64), and both ends of the sealed heat dissipation pipe (64) are connected to the inner wall of the camera housing (1). An air inlet (111) and an air outlet (112) are provided on the outer wall of the camera housing (1), and the air inlet (111), the sealed heat dissipation pipe (64) and the air outlet (112) are connected in sequence.

7. A refrigerated camera with a built-in motorized filter wheel according to claim 6, characterized in that, The radiator (6) also includes a mounting box (61) and a sealing cover (62). The mounting box (61) has an opening on one side and is connected to the sealing heat dissipation pipe (64) on the other side. The sealing cover (62) is detachably connected to the mounting box (61), and the sealing cover (62) closes the opening of the mounting box (61), forming a sealing cavity (63) between the sealing cover (62) and the mounting box (61). The image sensor (2) and the cooler (5) are both located in the sealed cavity (63), and the hot end of the cooler (5) is in contact with the corresponding inner wall of the mounting box (61).

8. A refrigerated camera with a built-in motorized filter wheel according to claim 6, characterized in that, The radiator (6) also includes an active fan (65), which is disposed on the inner wall of the camera housing (1). One end of the sealed heat dissipation pipe (64) is connected to the inner wall of the camera housing (1), and the other end is connected to the active fan (65). The air inlet (111), the active fan (65), the sealed heat dissipation pipe (64), and the air outlet (112) are connected in sequence.

9. A refrigerated camera with a built-in motorized filter wheel according to claim 6, characterized in that, The sealed heat dissipation pipe (64) is provided with a plurality of heat dissipation air ducts (643). The air inlet (111), the heat dissipation air ducts (643) and the air outlet (112) are connected in sequence, and the plurality of heat dissipation air ducts (643) are independently arranged.

10. A refrigerated camera with a built-in motorized filter wheel according to claim 9, characterized in that, The inner wall of the sealed heat dissipation pipe (64) is also provided with an air guide groove (6441). The air guide groove (6441) passes through one end of the sealed heat dissipation pipe (64) facing the air inlet (111), and the air inlet (111) and several of the heat dissipation air ducts (643) are all connected to the air guide groove (6441).

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