Outdoor video cameras «MVK» with a varifocal ARD lens.
In early 2010, there were many improvements in MVK products: direct heating of optical glass, megapixel IR-corrected lenses in the MVK-16 series, increased sensitivity of color video cameras due to SONY Super HAD CCD II matrices, access to varifocal lens settings in the MVK-08ARD series.
This time we will tell you in more detail about the improvements of the MVK-08ARD series video cameras.which now feature direct heating of the optical glass and access to the varifocal lens settings.
As is known, one of the problems that arise when opening the housing of an outdoor video camera is the ingress of moist air, which can lead to «fogging» of the optical window. Installers using standard-design video cameras in outdoor housings have to combat «fogging» in various ways:
— drying the interior of the housing with a hair dryer before sealing the housing;
— by placing a large amount of silica gel inside the casing;
— by powerfully heating the interior of the casing, which leads to high energy consumption.
And still, these measures do not guarantee against «fogging».
In MVK video cameras, this problem is solved differently — the small size of the housings does not require large energy costs for heating, and the drying of the internal space of the video camera and the sealing of the housing occur in factory conditions. This solution significantly reduces the likelihood of «fogging» of outdoor video cameras, but there is no possibility to open the video camera for adjustment.
With the advent of compact, high-quality varifocal ARD lenses, it became possible to use them in MVK video cameras, and it was decided to modernize the design of the video cameras to provide access to lens settings. During the modernization, the main requirements were: reliability in operation, ease of maintenance. Since the video camera was supposed to be adjusted at a site in conditions of high humidity, the option of heating the optical window became mandatory. As a result, the specialists of the ByteErg company developed a simple and elegant solution, thanks to which the video camera can now be opened for adjustment at the site without worrying that it will «fog up». Now all color and black-and-white video cameras of the MVK-08ARD series are equipped with varifocal lenses with access to their settings.
Elements of the solution
Heating ring– in the front part of the video camera around the lens there is a ring that is tightly pressed against the optical window and provides its direct heating, which prevents fogging during sudden changes and differences in temperature inside and outside the video camera. The total consumption of the video camera increases by only 40 mA.
Spring ring – tight contact of the heating ring with the optical window is provided by the spring ring, on which the heating ring is attached.
Varifocal lens– in fact, the system of access inside the video camera was developed for this purpose. The varifocal Direct Drive ARD lens allows changing the viewing angle within 97°-24° (f = 2.8–10.8 mm.), which is necessary and sufficient for solving most video surveillance tasks.
Threaded connection with a sealing ring – opening and closing the video camera body for adjustment is very simple – it unscrews and screws on. Tightness is ensured by a rubber sealing ring.
As you can see, the solution is really simple and elegant, in the spirit of the MVK line slogan – “Efficiency of reasonable solutions”. This solution will allow installers to safely adjust the viewing angle even in outdoor conditions. The reliability of the video camera is ensured.
Models of MVK video cameras that have access to the varifocal ARD lens:
MVK-0822AR, MVK-0832AR, MVK-0842AR, MVK-0842ARP, MVK-0832cD, MVK-0832cDP.