초록 ▼

The projection lens system is designed for the head mounted projective display (HMPD) system to provide a wide field of view up to seventy degrees. The lens is optimized from a double-Gauss lens composed of two singlet lenses, one diffractive optical element (DOE) lens, one aspheric lens and a stop

The projection lens system is designed for the head mounted projective display (HMPD) system to provide a wide field of view up to seventy degrees. The lens is optimized from a double-Gauss lens composed of two singlet lenses, one diffractive optical element (DOE) lens, one aspheric lens and a stop surface in the middle of the lens said lens has a focal length as low as approximately 23.9 mm whereby it has a field of view (FOV) of up to approximately 70 degrees and more. The lens can be combined with an additional field lens whereby the resulting lens combination provides improved image quality and/or field of view beyond approximately 70 degrees.

대표청구항 ▼

1. A compact lens assembly comprising: a positive convex-concave singlet lens; a plastic singlet lens adjacent to the positive lens, having one face being an aspheric substrate plus a diffractive optical surface; a mid-located stop/shutter positioned adjacent to the singlet lens; a plastic single

1. A compact lens assembly comprising: a positive convex-concave singlet lens; a plastic singlet lens adjacent to the positive lens, having one face being an aspheric substrate plus a diffractive optical surface; a mid-located stop/shutter positioned adjacent to the singlet lens; a plastic singlet negative lens with an aspheric surface on one of the faces adjacent to the stop/shutter; a glass singlet lens adjacent to the negative lens; and, said lens having a focal length less than about 35 mm whereby its field of view (FOV) is greater than about fifty degrees and the combination of the plastic and glass lens allows for visible spectrum images without smears and with reduced weight. 2. The compact lens assembly of claim 1, wherein the assembly provides a FOV of about seventy degrees. 3. The compact lens assembly of claim 1, further comprising: a helmet for mounting the lens assembly thereon for a head mounted display. 4. The compact lens assembly of claim 3, wherein the lens assembly is mounted in duplicate on said helmet, whereby the display is in stereo. 5. The compact lens assembly of claim 1, further comprising: a light source combined with the assembly; and, said light source positioned to be beamed through said lens whereby said combination is used in projection lens applications. 6. A method of forming a compact lens display assembly comprising the steps of: (a) combining aspheric negative lenses with positive lenses; (b) combining said combined lens with additional diffractive optics; (c) further combining said combined lens with an additional field lens whereby full combination provides improved image quality; and (d) applying the compact lens display assemblv to a projection lens system whereby a FOV beyond about 70 degrees is obtained. 7. The method of claim 6, further comprising the step of: applying the compact lens display assembly to a head mounted display system. 8. The method of claim 6, wherein the first step of combining includes the step of: combining two aspheric plastic negative lenses with two positive glass lenses wherein the compact lens display consist of four element optics. 9. The method of claim 6, further comprising the step of: fitting the compact lens display assembly into a space having dimensions of approximately 26.4 mm by approximately 19.8 mm. 10. The method of claim 9, further comprising the step of: mounting the assembly in a head mount. 11. A four lens component compact lens assembly comprising in combination: a positive singlet first lens; a singlet second lens adjacent to the positive lens, having one face being an aspheric substrate plus a diffractive optical surface; a mid-located stop/shutter positioned adjacent to the singlet lens; a singlet negative third lens with an aspheric surface on one face of the lens; a singlet fourth lens adjacent to the third lens; and, a focal number (F ·) less than about 2.92 whereby a FOV greater than about 50 degrees is realized and allows for visible spectrum images without smears. 12. The assembly of claim 11, wherein the first lens includes: a convex-concave lens. 13. The assembly of claim 11, wherein the second and the third lens include: plastic singlet lens. 14. The assembly of claim 11, wherein the fourth lens includes: a glass lens. 15. The compact lens assembly of claim 11, wherein at least one of the first lens, the second lens, the third lens and the fourth lens includes: a combination of a plastic lens and a glass lens. 16. The compact lens assembly of claim 11, wherein the assembly includes: dimensions of approximately 15 mm by approximately 13.4 mm. 17. A four plastic-glass compact lens assembly suitable for HMPD applications comprising: (a) in combination said compact lens assembly having a FOV greater than 50 approximately degrees; (b) a miniature flat panel display, and, (c) a field lens added close to said miniature flat panel display and between said display and said assembly whereby there is an incr ease in the FOV of said combination. 18. The four plastic-glass compact lens assembly of claim 17, wherein said assembly has a FOV greater than about 70 degrees. 19. The four plastic-glass compact lens assembly of claim 17, wherein said combination has improved image quality. 20. The four plastic-glass compact lens assembly of claim 17, wherein said miniature flat panel display is selected from at least one of: a liquid crystal display (LCD), an organic light emitting diode display (OLED), a liquid crystal on silicon (LCOS) display and a cathode-ray tube (CRT). 21. A method of forming a compact lens display assembly comprising the steps of: (a) combining aspheric negative lenses with positive lenses; (b) combining said combined lens with additional diffractive optics; (c) further combining said combined lens with an additional field lens whereby full combination provides improved image quality; and (d) fitting the compact lens display assembly into a space having dimensions of approximately 26.4 mm by approximately 19.8 mm. 22. The method of claim 21, further comprising the step of: mounting the assembly in a head mount. 23. The method of claim 21, wherein the first step of combining includes the step of: combining two aspheric plastic negative lenses with two positive glass lenses whereein the compact lens display consist of four element optics.