| 摘要 |
A display device (20) for a display wavelength range includes an image source (26), a relay group (28) made of optical elements transparent to the display wavelength range, and a reflective combiner (30) in facing relation to the relay group (28). The relay group (28) includes a glass optical wedge (40), a glass lens (82), and a group of plastic lenses (46, 64, 72) including a diffractive optical element (80). The group of plastic lenses (46, 64, 72) is positioned between the glass optical wedge (40) and the glass lens. The relay group (28) has the optical wedge (40) having a front face (42) in facing relation to the image source (26), and a back face (44); an aspheric lens module (46) having a front face (48) in facing relation to the back face (44) of the optical wedge (40), and a back face (50); and an aspheric lens (64) having a front face (66) in facing relation to the back face (50) of the aspheric lens module (46), a back face (68), and an optical axis (38). The aspheric lens module (46) is tilted and decentered with respect to the optical axis (38) of the aspheric lens (64). The relay group (28) further includes a diffractive-optical-element lens module (72) having a front face (72) in facing relation to the back face (68) of the aspheric lens (64), and a back face (76); and a positive-power lens module (82) having a front face (84) in facing relation to the back face (76) of the diffractive-optical-element lens module (72). |
