CCD camera window sealing anti-condensation device
By installing an annular heating device outside the CCD camera seal window, the problem of condensation of window sealed under low temperature conditions is solved, ensuring image quality and imaging effect.
Patent Information
- Application Number
- CN202421324168.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The CCD camera's sealing window is prone to condensation under low temperature conditions, which affects the acquisition of light and thus affects the imaging results.
A CCD camera window sealing and anti-condensing device is designed, including a ring heating device, which is installed in the anti-condensing housing outside the CCD camera window sealing. The heating device is connected to the power supply through a heating wire and a conductor. The thermostat adjusts the heating power through a temperature sensor to keep the window sealing temperature about 3℃ higher than the ambient temperature.
Effectively prevent window condensation of CCD cameras, ensure image quality, and solve the imaging problems caused by window condensation under low temperature conditions.
Smart Images
Figure CN222690037U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of CCD and CMOS cameras, and particularly relates to a CCD camera window sealing and anti-condensation device. Background Art
[0002] A CCD camera is a camera that uses a charge-coupled device (CCD) as a photoelectric conversion element. CCD is a semiconductor device that converts light signals into charge signals and converts the charge signals into images by reading them line by line. CCD cameras are often used in applications that require high-quality images and low noise, such as astronomy, biomedicine, and other fields.
[0003] In a CCD camera, light enters the CCD chip through the optical system, and photons hitting the CCD surface generate electron-hole pairs, which are stored in the CCD pixel units. Then, by reading line by line, the charge signal stored in each pixel unit is converted into a digital signal, and finally an image is formed.
[0004] The advantages of CCD cameras include high sensitivity, low noise, and wide dynamic range.
[0005] In order to reduce noise, the photosensitive chip of scientific-grade CCD cameras usually works at low temperatures and needs to be cooled by a refrigeration system. When cooling is required, a sealed window is required to isolate the CCD chip from the air. For CCD chips with large target areas, condensation will usually occur on the CCD sealing window due to cold radiation, which will affect the use of the CCD camera. Utility Model Content
[0006] The technical problem to be solved by the utility model is to provide a CCD camera window sealing and anti-condensation device in view of the deficiencies of the above-mentioned prior art.
[0007] In order to achieve the above technical purpose, the technical solution adopted by the utility model is:
[0008] The CCD camera window sealing anti-condensation device comprises an anti-condensation shell arranged outside the CCD camera window sealing, a heating device is installed in the anti-condensation shell, and the heating device is used to heat the outer surface of the CCD camera window sealing.
[0009] To optimize the above technical solutions, the specific measures taken also include:
[0010] The anti-condensation housing is an annular structure, and an annular groove is arranged on the inner side of the anti-condensation housing. The annular groove is arranged around the CCD camera sealing window, and the heating device is positioned and installed in the annular groove. The opening of the annular groove faces the CCD camera sealing window.
[0011] The above-mentioned heating device is a heating wire.
[0012] The heating device is connected to a power source arranged on the CCD camera through a wire, and the wire is buried in the anti-condensation housing.
[0013] A small ring and a large ring are arranged on the inner side of the anti-condensation shell, and the small ring and the large ring are arranged concentrically. The axes of the small ring and the large ring are coaxial with the axis of the CCD camera sealing window. The gap between the small ring and the large ring is an annular groove. The large ring is sealed with the edge of the CCD camera sealing window, and the small ring is matched with the gap of the CCD camera sealing window.
[0014] The gap between the small ring and the CCD camera sealing window is 0.5 mm so that the heating radiation can escape from the gap.
[0015] The CCD camera sealing window is fixed on the CCD camera housing, and the anti-condensation housing is fixedly matched with the CCD camera housing.
[0016] A sealing ring is provided on the mating surface between the anti-condensation housing and the CCD camera housing.
[0017] The above-mentioned anti-condensation shell is equipped with a first temperature sensor and a second temperature sensor. The detection head of the first temperature sensor is arranged on the outside of the anti-condensation shell for monitoring the temperature of the air outside the anti-condensation shell. The detection head of the second temperature sensor is close to the outer surface of the CCD camera window seal, and is used to monitor the outer surface temperature of the CCD camera window seal. A thermostat is provided on the heating device. The thermostat changes the heating power of the heating device by adjusting the voltage of the battery input to the heating device. The first temperature sensor and the second temperature sensor are connected to the thermostat signal. Under normal circumstances, the camera window seal temperature is kept about 3°C higher than the ambient temperature.
[0018] The above-mentioned thermostat is a single chip microcomputer.
[0019] The utility model has the following advantages:
[0020] 1. When detecting highly sensitive objects, the CCD camera chip usually needs to be cooled, and heat energy generates noise and interference. The CCD chip has less noise under low temperature conditions. The CCD camera chip must be 40 degrees different from the external environment temperature under normal operation, so there is a large temperature difference with the outside environment. Due to cold radiation, the CCD camera's sealed window is prone to condensation, which will affect light collection and thus affect the imaging results. In large machines, this situation is generally solved by blowing hot air; CCD cameras are small in size and cannot be blown like large machines, so the utility model adds an annular heating device to the sealed window of the CCD camera chip. The heating device makes the sealed window temperature slightly higher than the outside temperature, thereby preventing the target surface from fogging.
[0021] 2. The heating device of the utility model is installed in the annular groove. The small ring of the annular groove does not contact the CCD camera sealing window, and there is a gap of 0.5mm. This allows the high-temperature gas in the annular groove to exchange heat with the air in front of the CCD camera sealing window through air convection, thereby allowing the air in front of the CCD camera sealing window to heat the center of the CCD camera sealing window, so that the center of the CCD camera sealing window will not be fogged due to low temperature due to being too far away from the heating device.
[0022] 3. The utility model is provided with two temperature sensors, one of which is used to monitor the temperature of the air outside the anti-condensation shell, and the second temperature sensor is used to monitor the temperature of the outer surface of the CCD camera window. The user can adjust the heating power of the heating device according to the values of the two temperature sensors, and finally keep a certain gap between the temperatures sensed by the two temperature sensors. The heating power of the heating device can also be directly adjusted by a thermostat with a higher degree of automation. The provision of two temperature sensors can better control the heating power of the heating device, so that the heat dissipation and heating power are balanced. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic diagram of the CCD camera chip located in the CCD camera sealing window;
[0024] Figure 2 It is a schematic diagram of the internal structure of the utility model;
[0025] Figure 3 yes Figure 2 Left view of
[0026] Figure 4 yes Figure 2 Right view of .
[0027] The reference numerals are: CCD camera sealing window 1 , CCD camera housing 11 , anti-condensation housing 2 , sealing ring 21 , first temperature sensor 22 , second temperature sensor 23 , heating device 3 , annular groove 4 , small ring 41 , large ring 42 . DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.
[0029] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.
[0030] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.
[0031] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or units (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" / "several" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.
[0032] The utility model provides a CCD camera window sealing and anti-condensation device, such as Figure 1As shown, it is applied on the CCD camera sealing window 1. The inner side of the CCD camera sealing window 1 is the CCD camera chip, which is marked by a dotted line. The internal cooling of the CCD camera is localized and has a large temperature difference with the outside. Specifically, the internal temperature of the CCD camera can reach -40°C, so condensation is easy to form on the outer side of the CCD camera target surface.
[0033] like Figure 2-4 As shown, the CCD camera window sealing anti-condensation device includes an anti-condensation housing 2, a sealing ring 21, a first temperature sensor 22, a second temperature sensor 23, a heating device 3, a small ring 41 and a large ring 42.
[0034] An annular hole for installing the CCD camera sealing window 1 is formed on the CCD camera housing 11. The CCD camera sealing window 1 is installed in the annular hole. The outer edge of the anti-condensation shell 2 is fixedly connected to the annular hole through a sealing ring 21. The sealing ring 21 is made of insulating material. The anti-condensation shell 2 is located outside the CCD camera sealing window 1.
[0035] An annular groove 4 is provided on one side of the anti-condensation housing 2 facing the CCD camera sealing window 1, and a heating device 3 is fixedly installed in the annular groove 4, and the heating device 3 is a heating wire. The two groove edges forming the annular groove 4 are respectively a small ring 41 and a large ring 42, and the large ring 42 is tightly matched with the CCD camera sealing window 1, and there is a gap of 0.5mm between the small ring 41 and the CCD camera sealing window 1, so that the high-temperature gas in the annular groove 4 can diffuse to the center of the CCD camera sealing window 1. Since the center of the CCD camera sealing window 1 needs to collect light, a large area of the CCD camera sealing window 1 cannot be blocked, so the heating device 3 can only be arranged in a ring around the edge of the CCD camera sealing window 1. By setting a gap between the small ring 41 and the CCD camera sealing window 1, the heating effect of the center of the CCD camera sealing window 1 can be improved, and the center of the CCD camera sealing window 1 will not fog up at a relatively low heating temperature.
[0036] The first temperature sensor 22 and the second temperature sensor 23 respectively measure the temperature of the air outside the anti-condensation shell and the temperature of the outer surface of the CCD camera sealed window 1. When the temperature difference between the two is about 3°C, the outer surface of the CCD camera sealed window 1 will not fog. Therefore, when the second temperature sensor 23 detects that the temperature of the outer surface of the CCD camera sealed window 1 is lower than the temperature of the air outside the anti-condensation shell, the thermostat is controlled to increase the power of the heating device 3. In this embodiment, the distance between the second temperature sensor 23 and the heating device 3 is closer than the distance between the center of the CCD camera sealed window 1 and the heating device 3. Therefore, the heating device 3 is controlled to heat so that the temperature detected by the second temperature sensor 23 is 3°C higher than the temperature detected by the first temperature sensor 22, which can make the center position of the CCD camera sealed window 1 the same as the outside temperature, thereby ensuring that the entire CCD camera sealed window 1 will not fog.
[0037] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should be regarded as the protection scope of the utility model.
Claims
1. A CCD camera window sealing and anti-condensation device, characterized by: It comprises an anti-condensation housing (2) arranged outside a CCD camera sealing window (1), a heating device (3) being installed inside the anti-condensation housing (2), and the heating device (3) being used to heat the outer surface of the CCD camera sealing window (1).
2. The CCD camera window sealing and anti-condensation device according to claim 1, characterized in that: The anti-condensation housing (2) is an annular structure, and an annular groove (4) is provided on the inner side of the anti-condensation housing (2). The annular groove (4) is provided around the CCD camera sealing window (1), and the heating device (3) is positioned and installed in the annular groove (4). The opening of the annular groove (4) faces the CCD camera sealing window (1).
3. The CCD camera window sealing and anti-condensation device according to claim 2, characterized in that: The heating device (3) is a heating wire.
4. The CCD camera window sealing and anti-condensation device according to claim 3, characterized in that: The heating device (3) is connected to a battery arranged on the CCD camera via a wire, and the wire is buried in the anti-condensation housing (2).
5. The CCD camera window sealing and anti-condensation device according to claim 4, characterized in that: The inner side of the anti-condensation housing (2) is provided with a small ring (41) and a large ring (42); the small ring (41) and the large ring (42) are concentrically arranged; the axes of the small ring (41) and the large ring (42) are coaxial with the axis of the CCD camera sealing window (1); the gap between the small ring (41) and the large ring (42) is an annular groove (4); the large ring (42) is sealed with the edge of the CCD camera sealing window (1); and the small ring (41) is gap-matched with the CCD camera sealing window (1).
6. The CCD camera window sealing and anti-condensation device according to claim 5, characterized in that: The gap between the small ring (41) and the CCD camera sealing window (1) is 0.5 mm.
7. The CCD camera window sealing and anti-condensation device according to claim 5, characterized in that: The CCD camera sealing window (1) is fixed on the CCD camera housing (11), and the anti-condensation housing (2) is fixedly matched with the CCD camera housing (11).
8. The CCD camera window sealing and anti-condensation device according to claim 7, characterized in that: A sealing ring (21) is provided on the matching surface between the anti-dew condensation housing (2) and the CCD camera housing (11).
9. The CCD camera window sealing and anti-condensation device according to claim 8, characterized in that: The anti-condensation housing (2) is provided with a first temperature sensor (22) and a second temperature sensor (23); the detection head of the first temperature sensor (22) is arranged on the outside of the anti-condensation housing (2) for monitoring the temperature of the air outside the anti-condensation housing (2); the detection head of the second temperature sensor (23) is attached to the outer surface of the CCD camera sealing window (1) for monitoring the outer surface temperature of the CCD camera sealing window (1); the heating device (3) is provided with a thermostat; the thermostat changes the heating power of the heating device (3) by adjusting the voltage of the battery input to the heating device (3); the first temperature sensor (22) and the second temperature sensor (23) are connected to the thermostat signal.
10. The CCD camera window sealing and anti-condensation device according to claim 9, characterized in that: The thermostat is a single chip microcomputer.