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The vast majority of projectors currently on the market can be ceiling mounted. Effectively, most are mounted upside down, with their feet pointing towards the ceiling.
If you think about how a projector works when it is on a tabletop, the image is thrown from the lens upwards, i.e. the bottom of the image is about where the lens is. If you now think about the projector being ceiling mounted upside down, then the image is thrown down the wall. In the Menu features of the projector there will be a function to Invert the image, ensuring that the image is the correct way up. Some projectors will automatically switch the image, once the projector in inverted.
In an ideal world, one without obstructions such as light fittings, the projector’s lens should be horizontally central to where the image is going to be. Ideally the lens should also be level with where the top of the image will be. If both these criteria are met, then the image will be geometrically perfect.
In the real world, ceiling heights, light fittings, air conditioning and beams across the ceiling, mean that more often than not, the perfect position can not be used. To overcome these obstructions, then the projector can be mounted above the height of the top edge of the screen and tilted. In this instance, as the projector is tilted, the light hitting the bottom of the screen disperses as it has to travel a little further, this causes a ‘keystone’ effect. This is typified by an image that is wider at the bottom of the screen that at the top. Most projectors now have a function called keystone correction, this generally uses electronics to process the image. Effectively, the bottom of the original image is narrowed to compensate for the light spreading, this actually results in the bottom of the image being at a lower resolution than the top.
For most applications, keystone correction is perfectly acceptable, however for the purist, an unprocessed (or un-corrected) image is always preferred.
Projector Ceiling Mounts
The vast majority of projector models from most manufacturers are ceiling-mounted by using screw threads embedded in their bases. Most projectors have either 3 or 4 of these screw threads. Generally the screw threads used are M3, M4 or M5, however some do use M6. The M relates to the diameter of the screw thread in mm. There are a few models of projector that use very small M2.6 screw threads, these tend not to be supplied with the ceiling mounts and must be sourced independently.
The Ceiling Mount attaches directly on to the base of the projector, using the screws supplied along with the mount.
If your projector does not have mounting screw-holes in its base, then a projector cradle is required, these clamp the projector’s body. If your projector does not have screw threads in its base, please check it has the facility to invert the image in its menu features.
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Projectors manufactured by, Epson, Sanyo, Sharp, Hitachi, Sony, Panasonic and JVC, along with many others use the above method of ceiling mounting.