Super-short-focus front projector with aspheric-mirror projection optical system

Ogawa, Jun; Agata, Kazuhiro; Sakamoto, M.; Urano, Kunihiko; Matsumoto, Takayuki

doi:10.1889/1.2012592

Cited by 11 publications

(7 citation statements)

References 2 publications

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“…The aspect ratio (AR) of the projector screen is 16∶9, and the projector's TR is about 0.46, according to Eq. (12). Undoubtedly, an ultrashort TR projection system is obtained as the TR is less than 0.6.…”

Section: Throw Ratiomentioning

confidence: 99%

“…However, this method is not suitable for cameras with relatively large apertures, as the chief ray of each FOV is used to calculate the aspheric mirror profile. For the design of a compact structure, four-mirror aspheric-type projector [12][13][14] was being designed as a projector. However, the problem of tilt or decenter of the mirror surface makes it difficult for optical designers to fix them.…”

Section: Introductionmentioning

confidence: 99%

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Field curvature correction method for ultrashort throw ratio projection optics design using an odd polynomial mirror surface

Zhuang

Chen

et al. 2014

Appl. Opt.

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This paper presents a field curvature correction method of designing an ultrashort throw ratio (TR) projection lens for an imaging system. The projection lens is composed of several refractive optical elements and an odd polynomial mirror surface. A curved image is formed in a direction away from the odd polynomial mirror surface by the refractive optical elements from the image formed on the digital micromirror device (DMD) panel, and the curved image formed is its virtual image. Then the odd polynomial mirror surface enlarges the curved image and a plane image is formed on the screen. Based on the relationship between the chief ray from the exit pupil of each field of view (FOV) and the corresponding predescribed position on the screen, the initial profile of the freeform mirror surface is calculated by using segments of the hyperbolic according to the laws of reflection. For further optimization, the value of the high-order odd polynomial surface is used to express the freeform mirror surface through a least-squares fitting method. As an example, an ultrashort TR projection lens that realizes projection onto a large 50 in. screen at a distance of only 510 mm is presented. The optical performance for the designed projection lens is analyzed by ray tracing method. Results show that an ultrashort TR projection lens modulation transfer function of over 60% at 0.5 cycles/mm for all optimization fields is achievable with f-number of 2.0, 126° full FOV, <1% distortion, and 0.46 TR. Moreover, in comparing the proposed projection lens' optical specifications to that of traditional projection lenses, aspheric mirror projection lenses, and conventional short TR projection lenses, results indicate that this projection lens has the advantages of ultrashort TR, low f-number, wide full FOV, and small distortion.

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Section: Throw Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Field curvature correction method for ultrashort throw ratio projection optics design using an odd polynomial mirror surface

Zhuang

Chen

et al. 2014

Appl. Opt.

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“…Hence, the design concept of reflective objective lens is accepted by more and more lens designer. Many reflective projection lens design are reported [3][4][5], Ogawa studied a projection lens layout with four aspheric mirrors [6], the detail design and manufacture performance were put forward. But the manufacture and measurement of large aspheric surfaces are very difficult.…”

Section: Introductionmentioning

confidence: 99%

Design of off-axis reflective projection lens using spherical Fresnel surface

Zheng

2011

Optik

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“…At present, the design concept of the reflective objective lens is accepted by more and more lens designers. Many reflective objective lens designs are reported [3][4][5], for example, Ogawa J has studied the objective lens layout with four aspheric mirrors [6], and the detailed design and manufacture performance were put forward. However, the manufacture and measurement of large aspheric surfaces are difficult.…”

Section: Introductionmentioning

confidence: 99%

Design of objective lens with reflective spherical Fresnel zone plate

Zheng

Sun

et al. 2008

Front. Optoelectron. China

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An objective lens composed of a spherical Fresnel zone plate mirror and aspheric mirrors is designed. The Fresnel zone plate with a spherical shape is analyzed, and the method to approximately replace the aspherical mirror with spherical Fresnel zone plate is deduced. The objective lens is designed with a single spherical Fresnel zone plate mirror and three aspherical mirrors. Under the condition of 100 6 magnification, 2.5 Fresnel number and 120u field angle, the modulation transfer function can reach above 40% at 0.6 line pairs/mm on the magnification side, and the distortion is less than 2.2%. This method can provide a reference for the application of Fresnel zone plate in visible light imaging, and has a bright future with the continuous development of the fabrication technique of Fresnel devices.

show abstract

Super-short-focus front projector with aspheric-mirror projection optical system

Cited by 11 publications

References 2 publications

Field curvature correction method for ultrashort throw ratio projection optics design using an odd polynomial mirror surface

Field curvature correction method for ultrashort throw ratio projection optics design using an odd polynomial mirror surface

Design of off-axis reflective projection lens using spherical Fresnel surface

Design of objective lens with reflective spherical Fresnel zone plate

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