随着教学无尘化的发展，电子白板取代传统黑板的趋势开始在国内一线二线城市的学校中显现。与白板相搭配的短焦投影机也成为了教育市场一类新的热门产品。与此同时，短焦投影机电子白板也被应用在一些商务会议中，良好的互动性极大提升了办公演示效率。
Along with the development of the teaching of the clean, the electronic white board replaces the traditional blackboard and the trend is beginning to show in the domestic first tier cities. Collocation's short focal projector with the whiteboard has become a new class of education market popular products. At the same time, the short focal projector electronic whiteboard is also applied in some business meetings, a good interactive greatly enhance the efficiency of office demonstration.
与传统投影机相比，短焦投影机具有投影距离短的优势，在使用中，可以减少投影机光线直射演讲者眼睛的伤害，同时由于短焦投影机基本采用吊装的方式，也大大降低了投影光线被演讲者遮挡的问题。
Compared with the traditional projector, short focal projector with a short projection distance, in the use, can reduce the projector ray direct speaker eye injury, but due to the short focal projector basic use of lifting, but also greatly reduce the projector light is the problem of the speaker.
正因为上述特色，短焦投影机才在近两年得到投影机厂商的普遍重视，纷纷推出了适合商务以及教学的短焦投影机。不过，也由于短焦投影机自身的特色以及需要吊装使用的特殊方式，决定了短焦投影机使用过程中与普通投影有所不同。下面我们就来重点谈谈短焦投影机的使用注意事项。
Just because of the above characteristics, short focal projector in the last two years to get the general attention of the projector manufacturers, have launched a short focal projector for business and teaching. However, due to the characteristics of the short focal projector and the special way of the need to use, the short focal projector is different from the ordinary projection. Below we come to focus on the use of short focal projector note.
1、确定投影距离
1, determine the projection distance
普通投影机大多采用的(1.7~2.1):1手动变焦镜头，投影100英寸的画面，需要3米左右的投影距离。而短焦投影机大多采用定焦设计，投影100英寸的画面只需要1米左右甚至更短的距离。因此，在安装投影机的时候要充分考虑与之配套的电子白板的尺寸，然后选择相应的投影机，从而确定合适的吊装位置。
Ordinary projectors are mostly used (1.7~2.1): 1 manual zoom lens, projection 100 inches screen, 3 meters away from the projection. While the short focal projector is used to design the focal length, the projection of 100 inches of the picture only needs 1 meters or so or even less. Therefore, in the installation of the projector should be fully considered and the size of the electronic whiteboard, and then select the corresponding projector, so as to determine the appropriate lifting position.
2、画面变形调校
2, picture distortion adjustment
由于短焦投影机与电子白板搭配使用时基本采用吊装方式，因此投影机需要有画面的翻转功能，以及较容易的画面变形调节。普通的投影机通常只有单一方向的垂直梯形校正，而短焦投影为了方便用户调试，基本都具有水平和垂直双方向梯形校正，以便在安装时能够更好的调整画面。
Due to the use of the short focal projector and electronic white board, the basic use of the lifting method, so the projector needs to have a picture of the flip function, as well as the more easy to adjust the picture distortion. Ordinary projectors are usually only a single direction of vertical trapezoidal correction, while the short focal projection in order to facilitate the user debugging, the basic level and vertical direction of the double trapezoidal correction, in order to better adjust the installation when the screen.
3、吊装和维护
3, lifting and maintenance
在吊装短焦投影机的过程中，除了要结合电子白板尺寸考虑投影距离外，还需要考虑到后期维护投影机等问题。例如，投影机的除尘问题，往往在使用三个月或者半年之后，为了延长投影机的使用寿命，会需要定期为投影机除尘，因此，在吊装投影机的时候要充分考虑这一点，要采用利于用户拆卸投影机的安装方式。
In the process of lifting the short focal projector, in addition to considering the size of the electronic white board to consider projection distance, but also need to take into account the late maintenance projector and other issues. For example, the problem of dust removal, often in the use of three months or six months later, in order to extend the life of the projector, the projector will need to dust, and therefore, in the lifting of the projector should take full account of this point, to use to help users remove the installation of the projector.