Ultra-short projection lens with separated refraction meridianal image surface and refraction sagittal image surface

• Main Authors: ZHANG WENZI, ZHOU JIANJUN, LIU ZHENJIE
• Format: Patent
• Language: English
• Published: 30.12.2015
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

The invention relates to an ultra-short projection lens with separated refraction meridianal image surface and refraction sagittal image surface. The ultra-short projection lens is characterized by comprising a display chip, a refraction lens group and a rotationally symmetric reflector, wherein the display chip is imaged into a meridianal middle image and a sagittal middle image which are separated between the refraction lens group and the rotationally symmetric reflector through the refraction lens group; the meridianal middle image and a sagittal middle image which are separated offset astigmatism on a screen after being imaged through the rotationally symmetric reflector, so as to form clear images. The ultra-short projection lens is simple in structure, minimal in distortion, high in definition, good in tolerance, relatively low in requirement for mounting precision of optical elements, and high in mass production yield, has the projection ratio of 0.27-0.31 and the magnification of 170-220 times, and has the optical structure capable of offsetting astigmatism.