What's the throw ratio of projector?

Emma

Member
When you buy a projector, you usually look at a variety of parameters of the projector, such as the lumen, resolution, configuration and other parameters of the projector. But you may have no idea about the projector projection distance and the size of the projection screen, this time we have to look at the throw ratio of the projector, what is the throw ratio?

I. What's the throw ratio?

The throw ratio is defined as the ratio of the projected distance to the width of the image. It should be noted here that we usually call the length of the projected picture the width and the width the height, so don't get it wrong. In fact, projection is not only a simple definition, it can reflect the changes in projection technology over the years. From the earliest telephoto projectors to today's short-focus projectors, the projection ratio is getting smaller and smaller, which makes the application range of projectors more extensive. To put it simply, it is short distance and large screen.

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2. The numerical interval of throw ratio:

How big is the throw ratio of the projector? The throw ratio of ordinary projectors is usually between 1.5 and 1.9. When the throw ratio is less than 1, we usually call it a short focal lens, when the throw ratio is less than 0.6, we usually call it a super short focal lens. In addition, the throw ratio can also be a range, because some projectors support zoom, which means different sizes at the same distance, which the user can adjust according to their needs.

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3. Difference among ordinary, short focus, and super short-focus projector

So for the ordinary, short focus, and super short-focus projectors, in the case of fixed projection screen size, how far the throw distance is generally required? Take our common projection screen for 16:9 projector, to project a 100-size screen, the projector will project at a distance of about 3.3 meters at a projection ratio of 1.5; when the projection ratio is 1, the projection distance of the projector is about 2.2 meters. When the projection ratio is 0.4, this is what we usually call a reflex ultra-short focus laser projector, which can achieve a 100-inch screen projection distance is generally about 0.4 meters.

The original projector projected more than 100 inches of pictures require two or three meters distance, which makes most of the projector are chosen to install the hoisting mode, for education and other fields is acceptable, because the wiring and installation of the projector have been done in advance design arrangements. But it's troublesome to the users that did not reserve projector position.


4. Advantages of the reduction of throw ratio

With the development of science and technology and the change of people's needs, the throw ratio of projectors is becoming smaller and smaller. It has become a trend for ultra-short focus projectors to project large pictures in a short distance. At present, laser ultra-short focus projector is more and more applied in education, home use and other fields, the main reason is that ultra-short focus projector greatly reduces the projection distance, eliminating many users who want to use the projector but suffer from the concern of small indoor space. In addition, the reduction of the projector throw ratio has many advantages, such as the light will not shine on the speaker in front of the curtain, affecting the speaker to speak and the audience to watch.
 
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