Xmint
Member
The projectors currently used in primary and secondary schools are basically the same in overall dimensions and body structure. In the course of use, the projection image is often deformed due to incorrect placement height, orientation, and distance, and the screen size is uncomfortable; or blocking the students' view of the screen, directly affecting the effect of projection teaching. Therefore, the majority of teachers must master the placement technology of the projector to make it standardized and scientific in order to achieve the best teaching effect. Therefore，we should pay attention to the following three issues:
A. The projector should not be placed on the teacher's lecture table, so that the position is too high, blocking students from viewing the picture; nor should it be placed on a student chair with a low height, so that the teacher's operation demonstration is inconvenient and projection deformation is easy to occur; It should not be placed on the front desk of the students in the front row to interfere with and interfere with the students ’learning. The correct method is to place the projector on a specially made projector stand or trolley with a height of about 80cm to make the projector free Adjust the position, and the height of the projector table from the ground is about 1.2m. In this way, it does not block the students' view of the screen, nor does it affect the teacher's operation.
B. The main reason for the wrong position of the projected image is due to the placement of the projector. When the projector is placed on the left side of the vertical line of the center of the screen, the image is left, right, and right ; When the projector is placed on the right side of the vertical line of the screen center, it will cause the image to be large from left to right, so the projector must be placed on the vertical line of the screen center, and the projector is parallel to the screen, and the lens is facing the center of the screen. Symmetric image of left and right. Through in-depth investigation and understanding, a considerable number of teachers are very casual about the placement of the projector, and the above phenomenon will not be adjusted; it directly affects the projection teaching effect. Therefore, teachers must learn scientific and standardized adjustment methods.
C. At present, some elementary and middle school classrooms have non-standard classroom specifications, and the number of students in some classrooms is overstaffed, Therefore, some teachers put the projector on the lecture desk or student desk and use it, which affects students' eyesight and teaching effect.
At the same time, because the projector is placed very close to the screen, the image is too small, less than a quarter of the screen area, which affects the rear students to watch. The correct projection image should basically occupy the screen surface. The projected image must not be smaller than half of the screen surface. Only in this way can the screen be fully utilized. In order to achieve a good projection effect, the projector should generally be 2.5m to 3.5m away from the screen. The distance depends on the size of the slide. The larger the distance of the slide, the smaller the distance of the slide. Therefore, teachers should learn how to adjust the distance, that is, the size of the screen, and adjust the distance from the projector to the screen in time according to the size of the slide.
A. The projector should not be placed on the teacher's lecture table, so that the position is too high, blocking students from viewing the picture; nor should it be placed on a student chair with a low height, so that the teacher's operation demonstration is inconvenient and projection deformation is easy to occur; It should not be placed on the front desk of the students in the front row to interfere with and interfere with the students ’learning. The correct method is to place the projector on a specially made projector stand or trolley with a height of about 80cm to make the projector free Adjust the position, and the height of the projector table from the ground is about 1.2m. In this way, it does not block the students' view of the screen, nor does it affect the teacher's operation.
B. The main reason for the wrong position of the projected image is due to the placement of the projector. When the projector is placed on the left side of the vertical line of the center of the screen, the image is left, right, and right ; When the projector is placed on the right side of the vertical line of the screen center, it will cause the image to be large from left to right, so the projector must be placed on the vertical line of the screen center, and the projector is parallel to the screen, and the lens is facing the center of the screen. Symmetric image of left and right. Through in-depth investigation and understanding, a considerable number of teachers are very casual about the placement of the projector, and the above phenomenon will not be adjusted; it directly affects the projection teaching effect. Therefore, teachers must learn scientific and standardized adjustment methods.
C. At present, some elementary and middle school classrooms have non-standard classroom specifications, and the number of students in some classrooms is overstaffed, Therefore, some teachers put the projector on the lecture desk or student desk and use it, which affects students' eyesight and teaching effect.
At the same time, because the projector is placed very close to the screen, the image is too small, less than a quarter of the screen area, which affects the rear students to watch. The correct projection image should basically occupy the screen surface. The projected image must not be smaller than half of the screen surface. Only in this way can the screen be fully utilized. In order to achieve a good projection effect, the projector should generally be 2.5m to 3.5m away from the screen. The distance depends on the size of the slide. The larger the distance of the slide, the smaller the distance of the slide. Therefore, teachers should learn how to adjust the distance, that is, the size of the screen, and adjust the distance from the projector to the screen in time according to the size of the slide.
