Ricoh Company, Ltd.

Kddi Corporation

Hayato Yoshida

Issei Abe

Naoki Moniwa

Yasushi Takahashi

Ryosuke Kasahara

Hiroshi Takemoto

Mitsuru Nakajima

Shigeo Terabe

Shinobu Kanatani

Toshiyuki Kawasaki

Kohei Shimizu

Yukiko Hamano

Norihiko Sasaki

Shinobu Nanba

Ken Shirasaki

Yasuhiko Andou

Takashi Kamitakahara

Mutsumi Tanifuji

Tooru Kitayabu

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

A control apparatus identifies a first communication requirement and identifies a second communication requirement which is an alternative candidate to the first communication requirement on the basis of a service requirement received from a user, identifies an amount of resource requested for the first communication requirement and the second communication requirement, notifies the user of information indicating the second communication requirement and information relating to the amount of the resource identified for each of the first communication requirement and the second communication requirement, receives a selection of the first communication requirement or the second communication requirement by the user, and executes control to secure the resource amount identified for the communication requirement selected by the user.

Control apparatus for presenting communication requirement, control method, and computer-readable storage medium

A wide-angle lens comprising: an imaging lens system, including: a front lens group, an aperture, and a rear lens group, arranged in that order from an object side to an image side; wherein said front lens group comprises first and second lens elements, having negative power respectively, and a third lens that is a positive lens, arranged in that order from the object side to an aperture side; wherein said rear lens group comprises fourth and fifth lens elements, having positive power respectively, arranged in order from the aperture side to the image side; where an incident angle to an optical axis of the imaging lens system of a chief ray of a maximum angle of view passing through the aperture is &#x3b8;I, the following Expression 1 is satisfied.40&#xb0; (degrees)&#x3c;&#x3b8;&#x3c;60&#xb0; (degrees)&#x2003;&#x2003;Expression 1.

Wide-angle lens and imaging apparatus using the same

A wide angle lens whose field angle exceeds 160 degrees, includes a front group, an aperture stop, and a rear group arranged in this order from an object-side toward an image-side. The front group includes a first lens (negative meniscus) whose convex surface faces the object, a second lens (negative), a third lens (negative), and a fourth lens (positive), arranged in this order from the object-side toward the image-side. The rear group includes a fifth lens (positive), a sixth lens (negative), and a seventh lens (positive), arranged in this order from an aperture-side toward the image-side. The fifth and sixth lenses are combined, forming a cemented lens having positive refractive power. The fifth and sixth lenses are made of materials having Abbe numbers of greater than or equal to 50 and less than or equal to 30, respectively. A surface of the seventh lens facing the image is aspheric.

Wide angle lens and imaging device

A disclosed image pickup apparatus includes a first member holding a lens, and a second member holding an image pickup element converting an image formed via the lens into an electric signal, the second member having an approximately rectangular shape and two approximately arc-shaped location cutout portions at respective diagonal corners of the approximately rectangular shape. In the image pickup apparatus, the first and the second members are bonded via an indirect bonding structure portion where the first and second members are bonded via a fixing member with an ultraviolet curable adhesive and a filler bonding structure portion where the first and second members are bonded by supplying a thermosetting adhesive therebetween.

Image pickup apparatus, on-vehicle image pickup apparatus, method and apparatus for manufacturing image pickup apparatus

Disclosed is a wide-angle lens having a viewing angle of more than 130&#xb0;. The wide angle lens has a front group, an aperture, and a rear group arranged in this order from an object side to an image side. The front group has a first lens as a negative lens, a second lens as a negative lens, and a third lens as a positive lens arranged from the object side to the image side. The rear group is a cemented lens having a positive power when two lenses are bonded to each other. The wide-angle lens constitutes an image forming system with the five lenses as a whole, the first lens and the second lens of the front group are aspherical lenses, and the third lens is a spherical lens.

Wide-angle lens and image pickup apparatus

A wide-angle lens is disclosed that includes a front lens group and a rear lens group that are arranged in order from an object side to an image side with an aperture being arranged between the front lens group and the rear lens group. The front lens group includes at least two lenses arranged toward the object side that have negative powers, and at least one lens arranged toward the image side that has a positive power. The rear lens group includes at least one lens having a positive power. One of the lenses of the front lens group arranged second in order from the object side has a lens face that is arranged into an aspheric surface. The front lens group, the aperture, and the rear lens group make up an image forming system having an angle of view greater than 180 degrees.

Wide-angle lens and image capturing apparatus

Growing community of inventors

Iwate, Japan

Hayato Yoshida