Projector imaging principle is extremely characteristic [With schematic sharing]
What is the imaging principle of the projector, what are the characteristics, and what conditions need to be met in order to obtain the enlarged image effect? The following author will take everyone to look at the imaging principle of the projector, of course, will attach the necessary pictures.
The imaging principle of the projector is basically the same for all types of projectors. The projector first shines light onto the image display element to generate an image, which is then projected through the lens.
First, the light of the projection lamp is divided into red, green, and blue colors, and then images of various colors are produced. Because the element itself can only be displayed in monochrome, it is necessary to use 3 elements to generate 3 color components. Then the prism is used to combine the three color images into one image, which is finally projected onto the screen through the lens.
Projector imaging features: 1, to meet the object distance is greater than 1 times the focal length is less than twice the focal length (object distance is the distance from the object to the convex lens optical center, with the letter U; parallel light incidence from the lens optical center to the focus of light gathering The distance, with the letter F); 2, the image into an inverted zoom real image; 3, the opposite side.
What is the relationship between projector focus, object distance, and image distance? The image distance is the distance between the image and the plane mirror (or the optical center of the lens) (V is the image distance U is the object distance F and the focal length 2f is 2 times the focal length).
When U>2F, then F<V<2F, real images become inverted and reduced. When f<U<2F, then V>2fF, real images become inverted and enlarged. When U=2F, then U=V=2F. U<F, a positive cubic virtual image is used for a magnifying glass. When U=F, the projector is not imaged.
The imaging principle of the projector is basically the same for all types of projectors. The projector first shines light onto the image display element to generate an image, which is then projected through the lens.
First, the light of the projection lamp is divided into red, green, and blue colors, and then images of various colors are produced. Because the element itself can only be displayed in monochrome, it is necessary to use 3 elements to generate 3 color components. Then the prism is used to combine the three color images into one image, which is finally projected onto the screen through the lens.
Projector imaging features: 1, to meet the object distance is greater than 1 times the focal length is less than twice the focal length (object distance is the distance from the object to the convex lens optical center, with the letter U; parallel light incidence from the lens optical center to the focus of light gathering The distance, with the letter F); 2, the image into an inverted zoom real image; 3, the opposite side.
What is the relationship between projector focus, object distance, and image distance? The image distance is the distance between the image and the plane mirror (or the optical center of the lens) (V is the image distance U is the object distance F and the focal length 2f is 2 times the focal length).
When U>2F, then F<V<2F, real images become inverted and reduced. When f<U<2F, then V>2fF, real images become inverted and enlarged. When U=2F, then U=V=2F. U<F, a positive cubic virtual image is used for a magnifying glass. When U=F, the projector is not imaged.