Why does the projector need autofocus?
The projector is a very sophisticated product. Whether it is an LCD projector or a DLP projector, the light is controlled by a large number of liquid crystal gaps, or by nano-level lens reflection of the DMD chip, and the optical lens is also a precision component. It can be said that a slight change in the hardware of the projector can result in blurring or out of focus of the picture. Friends who often use the projector also know that after using the projector for a period of time, the picture often appears slightly blurred, in fact, this is caused by the thermal barrier shrinkage.
After the projector is working for a period of time, the optical engine will generate heat, and the lens of the optical machine will usually be displaced due to thermal expansion and contraction, which will result in blurred images. This phenomenon has always been considered as a common problem of many home projectors, and many projection brand manufacturers are helpless. How can I solve this problem? Obviously, autofocus is the answer to the question.
There is a distance measuring device next to the lens that can be automatically focused
Autofocus technology is not so new, and the camera has long achieved this. However, for the projector, there are not many products that configure the autofocus function, because this will increase the cost. But for consumers, the auto focus function is very useful. In addition to the above-mentioned thermal expansion and contraction caused by the lack of focus on the screen, in fact, often moving projectors, this function is also very much needed. So for LED pico projectors, the autofocus function is very meaningful. Because LED pico projectors often move, it is very cumbersome to manually focus each time.
The principle of autofocus technology
So how is the function of autofocus achieved? In fact, the principle is very simple. First we need to determine the distance, so we need the distance measuring device to measure the distance between the projector and the projection screen; then we need to use the microprocessor to read The distance measured by the distance measuring device is based on the projection distance. At this time, we need to establish a system, which is the database with the clearest distance and the focal length. These data can be calculated based on the hardware parameters of the lens.
Products that use the dual lens for autofocus
The projector can then use the look-up table to find the lens position required for a specific projection distance. At this time, the stepper motor is used to drive a zoom projection lens to the position to complete the auto focus. Although this process seems complicated, it can be completed in 1 second to 2 seconds. The accuracy of important ranging is not a problem in current stepper motors and adjustable focus lenses. Ranging is generally a method of optical ranging, and two lenses can be provided, and techniques such as infrared rays can also be used.
Autofocus technology can really solve the needs of projector users, especially LED pico projectors. Because of the frequent movement, this product often needs to be adjusted, so for this product, the appearance of autofocus function is the gospel of consumers. At present, there are many products on the market that support the function of self-focusing. It is believed that autofocus will be a standard function of LED micro projectors.
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