We supply all kinds of cloth cutting machines, including hand-held cloth cutting machine, fabric end cutting machine, hot and cold webbing cutter, automatic rolling cutting machine and so on, which can be widely used to cut cloth, leather, cotton textiles and other similar materials. According to the cutting shape, it can be divided into straight cutting, bevel cutting, rolling cutting and special shaped cutting. Our cutting machines are widely used in the field of clothing. Fabric cutting machine, fabric end edge cutter, Round Knife Cloth End edge Cutter, Apparel Fabric Roller blinds End Cutting Table Machine, Cloth end cutter, round knife cutter Suzhou Flying Man Assembly Automation Co., Ltd. , https://www.zjflyingman.com
Development of projection technology from telephoto to ultra-short focus
When you purchase a projector, you may focus on the brightness, resolution, and other values, but you may not know that the throw ratio is also an important indicator for evaluating a projector. Even in daily use, the projection ratio for the user Meaning is greater than brightness and other indicators.
From telephoto to ultra-short focus
Many may not be completely clear about the specific concept of projection ratio. It is actually the ratio of projection distance to screen width. The smaller the ratio, the less the projection distance required to project the same screen width. For example, if you add a projector with a throw ratio of 1, then using this projector to project 100 screens requires the lens to be 2.214 meters away from the curtain.
Projection ratio is the ratio of projection distance/frame width
Regarding the standard of throw ratio, we think that when the throw ratio is less than 1, we call it a short-focus lens; and when the throw ratio is less than 0.6, we usually call it an ultra-short-focus lens. From the past telephoto lens to the current ultra-short-focus projection products, from here we can see the development of projectors in recent years.
Page 2: Shorter projection distance highlights advances in projection technology
Early telephoto projection requires a distance of two to three meters before it can project a large picture of 100. When we use it at home, we often need to lift it. Therefore, in the early stages of wiring and installation, we must spend a lot of thought, especially if The location of the projector was not reserved during the renovation. The later installation of the projector would be even more troublesome. Not only would it be costly, but the alignment would be very unsightly. Therefore, in the past, users often scoff at home projections.
Short-focus products can greatly reduce the throw distance
The appearance of short-focus products makes the projection distance of home projection products shrink to less than 2 meters. This distance allows home users to avoid the trouble of lifting. At the same time, with the continuous improvement of home projection resolution and brightness, the projection products have entered more and more. The more ordinary home users come to the living room.
The realization of a lens with a projection ratio of 0.4 is a reflection-type ultra-short-focus projector. In fact, for this type of projector, it is meaningless to talk about the projection ratio. Just put it on the wall and put it on, you can easily Achieve 100 inches of large screen. To replace this projector with a laser source, it is now hot laser TV, so from this point of view, it is projection ratio is constantly shrinking, so that projection products have the courage to call traditional LCD TV.
Projection ratio continues to shrink, so that projection products have the courage to call traditional LCD TVs
The transition of the throw ratio reflects the continuous progress of the projector technology from the side. Looking at the big screen from the simple use of the past has become an important home appliance product for everyone to spend their leisure time. The emergence of reflective ultra-short-focus projectors allows small-sized users to enjoy hundreds of screens at home.