Canon Kabushiki Kaisha

Masakazu Tohara

Kazutaka Inoguchi

Shoichi Yamazaki

Kenichi Saito

Motomi Tsuyuki

Ryoji Kondo

Hiroshi Yoshikawa

Daisuke Kotake

Takashi Urakawa

Akira Yamamoto

Keiichiro Ishihara

Norifumi Kajimoto

Marina Kitakami

Akihito Taketani

Masato Ogawa

Minoru Tsuji

The optical system introduces light from a display element displaying an image to an observer. The optical system includes in order from the display element toward the observer, a first phase plate, a semi-transmissive reflective surface, a lens, a second phase plate, and a polarization beam splitter configured to reflect a first linearly polarized light and transmit a second linearly polarized light whose polarization direction is orthogonal to that of the first linearly polarized light. The semi-transmissive reflective surface has a transmittance smaller than a reflectance thereof.

Optical system and image display apparatus provided therewith

An image display apparatus includes an image display element, and an eyepiece optical system configured to guide light from the image display element to an exit pupil. The eyepiece optical system includes at least one correction element having different characteristics between a central area and a peripheral area different from the central area. When first light is light emitted from a central portion of the image display element, and second light is light emitted from an outermost peripheral portion of the image display element, the characteristics of the at least one correction element are set such that color drift of the second light after pass through the peripheral area from the first light after pass through the central area is less than color drift of the second light before pass through the peripheral area from the first light before pass through the central area.

Image display apparatus

The image display apparatus includes an image capturing optical system, an image sensor, a display element, and an ocular optical system. An optical axis of the image capturing optical system and an optical axis of the ocular optical system are located on a same straight line. An image capturing view angle of the image capturing optical system is larger than a display view angle of the ocular optical system. The display element is configured to display, of an image generated by using a signal from the image sensor, an area corresponding to the display view angle. When d represents a distance between a position of an entrance pupil of the image capturing optical system and a position of the exit pupil of the ocular optical system, the condition of 20 mm≤d≤60 mm is satisfied.

The image display apparatus includes an optical system configured to introduce light from a display surface of a display element to an observer. The optical system includes in order from the display element toward the observer, a first phase plate, a semi-transmissive reflective surface, a lens, a second phase plate, and a polarization beam splitter. The display element is configured to make, at a central portion of the display surface, luminance in a normal direction in which a normal to the display surface extends higher than that in a specific direction tilted outward with respect to the normal direction, and to make, at a most edge portion of the display surface, the luminance in the normal direction lower than that in the specific direction.

provided is an image display device that can reduce deterioration in image quality in a peripheral portion of an eyepiece optical system, includes an eyepiece optical system having a polarization element and guiding light from an image display element toward eyeballs of an observer, in which the eyepiece optical system includes a first lens for determining an emission angle from the image display element, and a surface of the first lens on the image display element side has an aspherical shape having a convex shape in a region including an optical axis of the first lens, wherein the aspherical shape has an inflection point within an optically effective region in a cross section including the optical axis, and wherein an eye relief E of the eyepiece optical system satisfies 15 mm&#x2264;E&#x2264;25 mm.

Image display device and eyepiece optical system

To provide an image display device that is advantageous in terms of a reduction in deterioration in image quality due to birefringence in an optical element of an ocular optical system in which polarized light is used, the image display device includes an ocular optical system including a polarization element and configured to guide light from an image display element toward an eyeball of an observer. The ocular optical system includes at least one optical element that has a forming gate mark in a part of an outer periphery. The forming gate mark is disposed in a direction of an apex of an image display region of the image display element with respect to a point on an optical axis of the ocular optical system in a cross section perpendicular to the optical axis of the ocular optical system.

Image display device, ocular optical system, and method of manufacturing ocular optical system

An image display apparatus includes an observation optical system that includes a prism having first to third surfaces. The observation optical system has a first section is a section that contains an optical path of light from a center of the original image to a center of the exit pupil through the third surface, the first surface, the second surface, and the first surface, and a second section is a section orthogonal to the first section. A reflection area for an internal reflection of the light on the first surface has a center part that is concave toward the exit pupil on the second section and a peripheral part at both sides of the center part has a convex shape toward the exit pupil.

To perform a high-accuracy three-dimensional measurement by performing an appropriate calibration in accordance with various temperature changes, an information processing apparatus that decides a temperature-dependent parameter of a projection apparatus configured to project a pattern onto a measurement target object to perform a three-dimensional measurement includes a holding unit configured to hold a relationship in which the temperature-dependent parameter of the projection apparatus is set as a temperature function, a temperature input unit configured to input a temperature of the projection apparatus, and a temperature-dependent parameter decision unit configured to decide the temperature-dependent parameter of the projection apparatus based on the temperature of the projection apparatus which is input by the temperature input unit and the relationship.

Information processing apparatus, method, and storage medium

An image processing apparatus includes an image acquirer configured to acquire an input image, and a processor configured to generate the original image by performing for the input image correction processing using correction data according to an optical aberration of the observation optical system. In the correction processing for the oblique view state, the processor uses first correction data according to the optical aberration corresponding to a first position distant from the observation optical system by a distance made by adding a rotating radius of the eye to the first distance, to generate an area other than the specific area in the original image, and uses second correction data according to the optical aberration corresponding to a second position closer to the observation optical system than the first position to generate the specific area.

A three dimensional shape measurement apparatus comprising: a projection unit configured to perform a projection operation to a measurement area; a photographing unit configured to photograph a target object in the measurement area undergoing the projection operation; and a measurement unit configured to measure a three dimensional shape of the target object based on the photographed image, wherein the measurement area includes a measurement reference surface serving as a reference for a focus position of a photographing optical system of the photographing unit, and is defined based on a projection range of the projection unit and a photographing range of the photographing unit, and the focus position is set deeper than a position of the measurement reference surface when observed from the photographing unit.

Three dimensional shape measurement apparatus, control method therefor, and storage medium

Three-dimensional measuring apparatus

A projector includes an area light source, a spatial light modulator, an illumination system that receives light from the area light source and illuminates the spatial light modulator, and a projection lens that forms an image by the light from the spatial light modulator. The area light source includes one of a light emitting region of a light emitting device and an image of the light emitting region, and the illumination system includes a rod integrator, the rod integrator is arranged so that an entrance plane of the rod integrator faces the area light source, and a size of the entrance plane of the rod integrator is smaller than a size of the area light source.

Projector having a rod integrator with an entrance plane smaller than an area light source

The projection apparatus is used for a measurement system and projects a projection light onto an object. An image capturing apparatus performs, through an imaging optical system, image capturing of the object onto which the projection light is projected. The projection apparatus includes a projection optical system satisfying a condition of |EXP0&#x2212;EXP1|/BL&#x2266;0.0015. EXP0 represents an exit pupil position of the projection optical system, EXP1 represents an actual exit pupil position of the projection optical system for a light ray of a maximum field angle in a measurable range for the object through the imaging optical system, and BL represents a base length between the projection optical system and the imaging optical system.

Projection apparatus for measurement system based on exit pupil positions

A three dimensional shape measurement apparatus may include a projection unit configured to perform a projection operation to a measurement area; a photographing unit configured to photograph a target object in the measurement area undergoing the projection operation; and a measurement unit configured to measure a three dimensional shape of the target object based on the photographed image. The measurement area includes a measurement reference surface serving as a reference for a focus position of a photographing optical system of the photographing unit, and is defined based on a projection range of the projection unit and a photographing range of the photographing unit. The focus position is set deeper than a position of the measurement reference surface when observed from the photographing unit.

A projector includes an area light source, a spatial light modulator, an illumination system that receives light from the area light source and illuminates the spatial light modulator, and a projection lens that forms an image by the light from the spatial light modulator. The illumination system includes an optical member having a cuboid shape and including an entrance plane and an exit plane, the optical member being arranged so that the entrance plane faces the area light source, and the optical member forming, on the exit plane, an illuminance distribution having a higher illuminance at a peripheral portion than at a central portion. The spatial light modulator is illuminated with the light from the exit plane.

Growing community of inventors

Komae, Japan

Masakazu Tohara