Compact lens assembly for the teleportal augmented reality system
AssigneeUniversity of Central Florida
InventorsYonggang Ha, Jannick Rolland
Life of this patent
Estimating the term…
Abstract
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.
Claims23
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.
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.
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.
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 increase in the FOV of said combination.
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.
Dependencies are inferred from the claim text.