Short focus image projection device
An image projection and image technology, applied in projection devices, instruments, optics, etc., can solve the problems of small field of view, unsatisfactory volume and quality, etc., and achieve the effects of improving brightness, light weight, and enhancing contrast
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no. 1 example
[0053] according to Figure 1~4 Shown is a first embodiment of the invention in which figure 1 , 2 It is the optical path structure diagram of the short-focus image projection device shown in the first embodiment of the present invention on the YOZ plane and the XOZ plane respectively, image 3 , 4 It is a short-distance projection optical path structure diagram on the YOZ plane and the XOZ plane of the short-focus image projection device shown in the first embodiment of the present invention, wherein image 3 left, Figure 4 The schematic projection distance above is 23cm, and the projection area remains rectangular, reaching 42.5 inches. image 3 right, Figure 4 The schematic projection distance below is 46cm, the projection area is extended to 85 inches, and the projection ratio is 2.45. According to the image projection device of this embodiment, specifically, such as figure 1 As shown, including micro-display image sources, it is preferable to use reflective displ...
no. 2 example
[0065] Figure 10 shows the optical path structure diagram of the image projection device according to the second embodiment of the present invention, Figure 11 , 12 It is a short-distance projection optical path structure diagram on the YOZ plane and the XOZ plane of the short-focus image projection device shown in the second embodiment of the present invention, wherein Figure 11 left, Figure 12 The schematic projection distance above is 23cm, and the size of the projection area is 45 inches. Figure 11 right, Figure 12 The schematic projection distance below is 46cm, the size of the projection area is 85 inches, and the projection ratio is 2.16. Unlike the first embodiment in which the lenses of the front and rear lens groups are all composed of spherical lenses, the lenses in the front and rear lens groups in the second embodiment of the present invention all contain aspheric surfaces, and the use of aspheric surfaces can further improve image quality.
[0066]Acc...
no. 3 example
[0077] Figure 15 It shows the optical path structure diagram of the image projection device according to the third embodiment of the present invention. Unlike the schematic projection areas in the first and second embodiments, which are roughly parallel to the optical axes of the coaxial front and rear lens groups, the third embodiment of the present invention In the embodiment, the projection area is realized to form a certain angle with the direction of the above-mentioned optical axis, and at the same time, in order to compensate the off-axis aberration caused by the inclination of the image plane, the image source is placed obliquely relative to the optical axis of the front and rear lens groups, and the surface type of the curved mirror is a free-form surface .
[0078] In the third embodiment, it is preferable to use a static pattern mask with light transmittance and / or color distinction in conjunction with a collimator mirror (not shown) to emit backlight illumination ...
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