Canon Kabushiki Kaisha

Ritsuo Machii

Katsuyuki Kobayashi

Hajime Sato

Yuichiro Yoshimura

Akihiro Matsushita

Takayuki Komine

Takayuki Hashimoto

Naoki Umemura

Takuto Kawahara

Hirokuni Takano

Shinya Asano

Noboru Shimoyama

The sensor unit of each of a first bar housing unit and second bar housing unit is moved. The moving amount is measured and stored. The distribution of a light amount received by the light receiving unit of the sensor unit of each of the first bar housing unit and second bar housing unit is detected, and whether the moving amount is appropriate is determined based on the detection result. A calculation value used when the coordinates of the pointed position in the coordinate input effective region are calculated based on variations of the light amount distribution is corrected by using the moving amount stored when it is determined that the moving amount is appropriate.

Control of coordinate input apparatus based on light distribution and moving amounts of sensor units

According to one aspect of the invention, a coordinate input apparatus for calculating a position of an object positioned on an input area comprises: a light projecting unit; retroreflecting members arranged along two opposite sides of a rectangular area including the input area, and having a reflecting surface which reflects the light emitted by the light projecting unit; a light receiving unit; and a calculation unit configured to calculate the position of the object based on a measurement result from the light receiving unit, wherein a set of the light projecting unit and the light receiving unit arranged adjacent to the retroreflecting member to sandwich the retroreflecting member in a direction perpendicular to a surface of the input area are positioned in at least two portions of each of the retroreflecting members arranged on the two opposite sides.

Coordinate input apparatus

A coordinate input apparatus includes a light projecting unit configured to project light parallelly to an effective coordinate input region, a reflection unit configured to retroreflect the light projected by the light projecting unit, and a light receiving unit configured to receive light from the light projecting unit or the reflection unit. The coordinate input apparatus includes a moving unit configured to move a set of the light projecting unit, light receiving unit, and reflection unit in a direction perpendicular to the effective coordinate input region in order to ensure a light amount with which a pointed position in the effective coordinate input region can be calculated based on variations of a light amount distribution obtained from the light receiving unit.

A coordinate input apparatus includes a first housing and a second housing each of which incorporate at least two sensor units each including one of the light projecting unit and one of the light receiving unit. A pointed position to an effective coordinate input region is calculated based on variations of a light amount distribution obtained from the light receiving units of each of the first and second housings. In each of the first and second housings, the field range of a light receiving unit is almost parallel to the effective coordinate input region, the optical axis direction of the light receiving unit is a direction perpendicular to a line segment connecting the barycenters of at least two sensor units in a single housing, and the field range is set to be asymmetric to the optical axis direction.

A projection unit is mounted on a projection magnification correcting member, and the projection magnification correcting member includes a first member and a second member. The first member includes a first correction mechanism for correction in a direction parallel to a central light ray, and is supported by a housing. The second member includes a second correction mechanism for correction in a direction parallel to a normal line to an image plane enlarged and projected from the projection unit without passing through a reflection mirror, and is supported by the first member.

Rear projection type display apparatus

An illumination apparatus includes a lamp, and a holding member for rotatably holding the lamp about its optical axis as a rotational axis. An projector includes the illumination apparatus, a first optical system for separating white light from the illumination apparatus into light of red, green and blue, a first panel for modulating the light of red per each pixel, a second panel for modulating the light of green per each pixel, a third panel for modulating the light of blue per each pixel, a projection lens, and a second optical system for superimposing the modulated light of red, green and blue on a display surface, such as a screen, in cooperation with the projection lens.

Illumination apparatus and projector

An image recording apparatus for recording an image on a recording sheet includes a recording head for recording the image on the recording sheet, a carriage for holding the recording head, the carriage being reciprocated along a convey route of the recording sheet, a motor for applying a drive force for conveying the recording sheet and a drive force for causing the recording head to move between a recording position where the recording head performs image recording and a retracted position where the recording head is retracted from the recording position, and a control unit for controlling the motor to switch between conveying the recording sheet and moving the recording head in accordance with movement of the carriage.

Thermal printer with biaxial motor feed of the carriage and ribbon

A recording device in which an ink ribbon is used and recording is performed shifting the ribbon in the direction of the width of the ribbon and having a sensor for detecting the end of an effective portion of the ribbon. Using the end sensor, the vertical position of the region of the ribbon used for recording is detected.

Growing community of inventors

Tokyo, Japan

Ritsuo Machii