Ricoh Company, Ltd.

Nobuo Sakuma

Kazuhiro Fujita

Atsushi Takaura

Katsumi Yamaguchi

Osamu Endou

Hiromichi Atsuumi

Seizo Suzuki

Makoto Obu

Kenichi Takanashi

Kan Tomita

Akira Momose

Takashi Mama

Masahiro Ito

Tomohiro Nakajima

Koji Masuda

Yuji Yamanaka

Kazuyuki Shimada

Hiroyoshi Funato

Akihisa Itabashi

Magane Aoki

Takeshi Ueda

Toyokazu Satomi

Keiji Okamoto

Hiromi Takada

Yutaka Kaneko

Nobuhiro Morita

Takami Suzuki

Osamu Endo

Motoaki Kawazu

Satoru Yoshioka

Takeshi Komurasaki

Yasutaka Izumi

Seizoh Suzuki

Toshio Shiina

Takayuki Ohsawa

Tadashi Matsuura

Yoshishige Wada

Keinichi Takanashi

In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus

A projection optical system for use in an image projection apparatus illuminating a lightbulb forming an image in accordance with a modulating signal with illumination light from a light source is disclosed. The projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the lightbulb. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the lightbulb is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

A light emitting array including at least a plurality of light emitting elements, each of which is provided thereon with a microlens in one-to-one correspondence. Light emitting portions of the light emitting element are provided having the shape of a rectangle and formed so as to satisfy the relational expression, Lmin&#x2266;D&#x2266;P, where Lmin is the length of the shorter side of the rectangle, P an alignment pitch of the light emitting elements, and D the diameter of microlens. In addition, light emitting elements are formed in line on a transparent thin film layer to satisfy the relationship, T&#x2266;2&#xb7;D, where Tis the thickness of the transparent thin film layer and Dthe diameter of each microlens. The light emitting array may suitably be included in the light source unit which is then incorporated into image forming apparatuses for forming mono-color or multiple-color images.

Light emitting array with improved characteristics, optical writing unit, and image forming apparatus

A projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source. The projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

A projection optical system for use in an image projection apparatus illuminating a light valve forming an image in accordance with a modulating signal with illumination light from a light source. The projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the light valve. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the light valve is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

A projection optical system guiding and projecting a light beam from a projected object surface onto a projection surface in an upstream-downstream direction through a transmission dioptric system and a reflection dioptric system. An intermediate image surface of the projected object surface is positioned closer to the reflection dioptric system than to the transmission dioptric system, and an intermediate image on the intermediate image surface is formed as the final image on the projection surface via the reflecting mirrors, which include at least one anamorphic polynomial free-formed surface having different vertical and lateral powers. A light beam from the reflection dioptric system to the projection surface is guided at an angle to a normal of the projection surface and the transmission dioptric system is decentered with respect to a normal of the projected object surface, the transmission refractive elements prevented from being decentered with respect to each other.

Virtual screen display device

A multiple-optical scanner includes an optical source that produces a plurality of optical beams such that the plurality of optical beams cross each other substantially at a location of a rotary polygonal mirror when viewed in a direction of a rotational axis of the rotary polygonal mirror.

Multiple-beam optical recording apparatus

In an image forming apparatus, a device for removing an image forming substance from a paper or similar image holding medium senses the orientation of fibers constituting the paper. While a light beam is emitted obliquely toward the paper, the diffused distribution distribution of the resulting reflection is measured in order to determine the orientation of the fibers. A preselected relation is set up between the fibers and the direction of paper transport on the basis of the determined orientation. Further, a condition for applying an unstabilizing liquid to the paper and a condition for drying the paper are varied on the basis of the determined orientation.

Method and device for determining fiber orientation of paper, and

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Inagi, Japan

Nobuo Sakuma