Projection optical device with imaging function

Patent

Projection optical device with imaging function

- 11 Jun 2009

TL;DR: In this paper, the authors proposed an optical path separating means for separating the optical paths of image-forming light and imaging light from each other between an imageforming means and a projection optical system, and oblique projection conditions were set so that a specular reflection light component PN by the projection surface 11 of projected light LP is not made incident on the projected optical system.

Abstract: PROBLEM TO BE SOLVED: To provide a projection optical device with an imaging function, which is capable of effectively preventing the degradation of the image quality of a picked-up image due to a hot spot. SOLUTION: The projection optical device with the imaging function includes an optical path separating means 7 for separating the optical paths of image-forming light and imaging light from each other between an image-forming means and a projection optical system, and an original image displayed on the image-forming means is obliquely projected onto a projection surface 11 by the projection optical system 9. Oblique projection conditions are set so that a specular reflection light component PN by the projection surface 11 of projected light LP is not made incident on the projection optical system 9. COPYRIGHT: (C)2009,JPO&INPIT

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References

Patent

Projection display device

Masayuki Katagiri, +5 more

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TL;DR: In this paper, a projection display device constituted so that positional relation between a display picture and a luminescent point picture can be prevented from being fluctuated even when the installing state thereof or the magnification of a lens is changed, whose structure is simple, whose portability is excellent and which is inexpensive.

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Patent

Projection system and projector

Kunio Yoneno

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TL;DR: In this article, a projection system comprising a projection unit for projecting light of an image onto a preset projection portion, an imaging unit for imaging the projected image by the projection unit, and a processing unit for performing a preset processing based on the imaging result by the imaging unit is presented.

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Patent

Video display device and focusing control device thereof

Saito Etsuro, +1 more

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TL;DR: In this paper, the authors proposed a method to eliminate the need for time and labor required for controlling the focusing of a display video and to enable a sharp image without out-of-focus to be displayed.

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Patent

Reflection type liquid crystal projector unit

Sato Yoshihisa

- 14 Dec 2001

TL;DR: In this paper, a reflection type projector unit displays the focused image onto the screen, by making the luminous flux reflected by the screen incident on a photodetector 11 again via the projection lens 8 and the polarization beam splitter 6 and causing a focusing control section 12 to drive the focal position varying mechanism 10, according to the signal outputted from the photodeterector by the incidence of the reflected luminous fluid.

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