Design of ultrashort throw lenses with catadioptric relays for curved screens

Nishikawa, Jun; Nishiyama, Mariko

doi:10.1117/12.2593875

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Projection lenses for ultrashort-throw projectors are optical systems that generally achieve half-field angles of approximately 75°. Typical examples include (a) optical systems in which a group of rays emitted from a refractive optical system are magnified by a convex mirror 7 ; (b) optical systems where four curved mirrors are used to achieve a wide angle 8 ; (c) optical systems with an intermediate image plane within a refractive optical system 9 ; (d) optical systems that form intermediate image planes after emission from the refractive optical system (RO) and subsequently enlarge them with a concave mirror 10 ; (e) optical systems that have two intermediate images in the catadioptric relay optical system and enlarge them with a concave mirror 11,12 ; and (f) optical systems that achieve an angle of incidence of 130° at a maximum halffield angle of view on a curved screen 13,14 . Although a wide angle of view is possible, it is impossible to match all the light ray directions because the optical system light rays diverge from the exit pupil over a wide angular range.…”

Section: Introductionmentioning

confidence: 99%

Design of projection-based augmented reality system using holographic screen display

Nishikawa¹,

Nakamura²

2022

Current Developments in Lens Design and Optical Engineering XXIII

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Holographic display elements (HOEs) with a high diffraction efficiency and size enlargement have been developed since 2019. To achieve high brightness and low haze, unprecedented optical systems have been proposed with a uniform chief ray angle of 0° in the x-section and 70° in the y-section of the HOEs. A 360° cylindrical holographic screen display (CHSD) was obtained by providing a large tilt to the surface shape near the optical axis. This was done using a first-order odd aspherical coefficient for the light flux from a refractive optical system (RO). A flat holographic screen display (FHSD) is a compact, high-performance display that uses three decentered and tilted freeform mirrors to route light flux from the RO in a ball-like form. Prototyping also proposes the possibility of an augmented reality system that takes advantage of the high transparency. The design for further miniaturization while maintaining optical performance was also discussed, in which the size of the first mirror was reduced by reducing the half-field angle of the RO to approximately 6°. Furthermore, by increasing the negative power of the second mirror, the small size could be maintained. The size of the last mirror was dependent on the screen size and could not be reduced. By laying down the posture of this mirror, we were able to halve the size reduction in the vertical direction. In this paper, lens designs for CHSDs and FHSDs are reported. The potential of this display is also discussed.

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Section: Introductionmentioning

confidence: 99%

Design of projection-based augmented reality system using holographic screen display

Nishikawa¹,

Nakamura²

2022

Current Developments in Lens Design and Optical Engineering XXIII

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Design of a curved-target ultrashort throw projector based on predistortion and illumination precorrection

Cheng,

Liu,

Chen

et al. 2023

Appl. Opt.

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Ultrashort throw projector (UTP) technology has been a challenging research focus in the fields of large field of view and short-distance projection. In this paper, we propose a design method for a curved-target UTP based on image precorrection. A predistortion method (<1pixel) using a radial basis function is presented to effectively correct irregular distortion. A grayscale precorrection method is used to address uneven illumination distribution. We provide a UTP design example and verify the correction methods using two different curved targets (aspherical and freeform), demonstrating effective distortion correction (<1%) and illumination uniformity (>90%). The structure similarity index measure for the projection images shows close or greater than 0.9 correlation.

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Design of ultrashort throw lenses with catadioptric relays for curved screens

Cited by 2 publications

References 9 publications

Design of projection-based augmented reality system using holographic screen display

Design of projection-based augmented reality system using holographic screen display

Design of a curved-target ultrashort throw projector based on predistortion and illumination precorrection

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