Ricoh Company, Ltd.

Ken Shirasaki

Hiroyuki Satoh

Kenichi Ishizuka

Shusaku Takasu

Izumi Itoh

Hayato Yoshida

Takashi Kamitakahara

Akihiro Kawamura

Mutsumi Tanifuji

Kenya Fujiwara

A projection lens system (G, G) includes a front group (G) disposed on a projection-plane (SC) side, a rear group (G) disposed on a display-surface (SF) side of an image display element inclined with reference to the projection plane (SC), and an aperture stop (S) disposed on the display-surface (SF) side with reference to the front group (G). The rear-group optical axis is tilted on the shared plane at a tilt angle ξ with reference to the display-surface normal. In projection lens system (G, G), when the amount of shift Δ is zero, the tilt angle ξ satisfies a conditional expression 0<ξ/ξs<1, where ξs denotes a tilt angle when Scheimpflug principle is satisfied with reference to the display surface (SF) and the projection plane (SC).

Projection lens system and image projection apparatus

An imaging device includes a reflection polarization prism having an incident surface on which illumination light emitted from a light emitter is incident and a transmission surface that passes the illumination light entered the incident surface through one surface of a light-transmitting member, an imager including an image sensor having a first light-receiving portion that receives light from a predetermined imaging area transmitting the light-transmitting member and a second light-receiving portion adjacent to the first light-receiving portion that receives the illumination light reflected on an opposite surface to the one surface of the light-transmitting member, and an optical member that emits the light introduced from the predetermined imaging area to the first light-receiving portion and emits the illumination light reflected on the opposite surface of the light-transmitting member to the second light-receiving portion.

Imaging device, object detector and mobile device control system

Growing community of inventors

Kanagawa, Japan

Ken Shirasaki