This article was published in Metalworking, Thermal Processing, 2009, Issue 03
Door Viewers
The door observer is a small optical instrument installed on the door of a residence, which is convenient for residents to observe the outdoor situation. Has become a necessity for home safety.
It is composed of a concave lens (objective lens) and a convex lens. The focal length of the objective lens is extremely short, it makes the outdoor person or object into an upright and reduced virtual image, which falls just within the focus of the eyepiece, and finally a reduced upright virtual image is obtained, which is exactly at the clear viewing distance of the human eye. Nearby, you can see the situation outside the door clearly.
To ensure the quality of this Reliable Solid Brass Door Viewers we have strict quality control from material processing, polishing, assembly and packaging. Extensive experiences, mature technology and professional service allows us to meet the different needs of customers of different regions.We produce Door Hardwares of various functions and styles, fits perfectly to all kinds of frameless shower enclosures. Special requirements and sizes are available. Please just feel free to contact us if you have any question. Our team is on call for 24/7 to provide the worry-free before/after-sale service.The Door Hardware produced by our company includes door viewers, Door Hinges , Door Stoppers, Door Holders, Door Guards , door selectors, Door Hang Wheels and other series of hardware products, which can meet the installation needs of all building materials.
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