Asahi Kogaku Kogyo Kabushiki Kaisha

Pentax Corporation

Tuyoshi Ishikawa

Kenichiro Otsuka

Yuji Ogawa

Hiroaki Ando

Takayuki Ito

Takashi Enomoto

Shinichi Kusakawa

Minoru Iida

A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, a spatial filter and an imaging lens. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using a component of light which has been reflected from the object and passed through the spatial filter.

Pattern reading apparatus

A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a scattered component of light which has been reflected from the object. The imaging element is positioned such that the image of the pattern is imaged for reading the pattern. A shift mechanism is provided for supporting the objective lens for movement parallel to a direction approximately perpendicular to the optical axis of the objective lens.

A pattern reading apparatus includes a minute-area light source positioned such that an illumination light beam is incident on an object surface having a pattern formed thereon as an object to be read without passing through a lens. An objective lens converges a light beam having information of the pattern. A spatial filter has a shading region that shades a portion of the light beam having passed through the objective lens, the portion forming an image of the light source. An imaging element reads an image of the pattern formed by the light beam having passed through the spatial filter.

A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a diffused component of light which has been reflected from the object. A spatial filter has a shading region that shades a portion of the reflected light beam from the object surface which has passed through the spatial filter and forms the image of the light source. The imaging element reads the image of the pattern formed by the light beam having passed through the spatial filter. An extension of a principal plane of the imaging lens interposed between the object surface and an imaging surface, an extension of a plane of the imaging surface and an extension of a plane of the object surface, intersect at a point.

A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a diffused component of light which has been reflected from the object. The imaging element is positioned where the image of the pattern is imaged for reading the pattern.

A pattern reading apparatus reads a pattern from a reflective object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a diffused component of light which has been reflected from the object. The imaging element is disposed at a position where the image of the pattern is imaged for reading the pattern. An adjustment mechanism adjusts a position of the light source in a plane perpendicular to a principal beam of the illumination light beam.

A pattern reading apparatus includes an objective lens positioned opposite an object surface, the object surface being a reflection surface having a pattern formed thereon as an object to be read. A minute-area light source is positioned to be conjugate with a center of curvature of the object surface through the objective lens, for illuminating the object surface through the objective lens. An imaging lens is positioned farther from the object surface than the light source, with the optical axis of the imaging lens being coincident with the objective lens. An imaging element reads the image of the pattern which is reflected at the object surface and formed through the objective lens and the imaging lens.

A pattern reading apparatus for reading a pattern from an object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes an illumination light beam from the light source to be incident on the object and converges the light beam reflected from the object. The imaging lens forms an image of the object using only a scattered component of light which has been reflected from the object. The imaging element is disposed at a position where the image of the pattern is imaged for reading the pattern.

A pattern reading apparatus for reading a pattern from a reflective object or a transparent object. The pattern reading apparatus includes a minute-area light source, an objective lens system, an imaging lens, and an imaging element. The objective lens system causes the illumination light beam from the light source to be incident on the object and converges the light beam reflected from or transmitted through the object. The imaging lens forms an image of the object using only a scattered component of light which has been reflected from or which has passed through the object. The imaging element is disposed at a position where the image of the pattern is imaged for reading the pattern. In particular, light that forms an image of the light source is prevented from reaching the imaging element. In the case of a reflective object, ghosting light due to a reflection from a surface of the objective lens is prevented from reaching the imaging element.

In a light distribution lens for a strobe provided in front of a strobe light emitter to gather strobe light, one of opposed lens surfaces is made of a convex surface, and the other lens surface is made of a convex Fresnel surface. A zoom strobe device is also disclosed, which includes a light emitter unit having a light emitter and a reflector, a light distribution lens provided in front of the light emitter unit to gather light emitted from the light emitter, and a zoom device for varying the distance between the light emitter unit and the light distribution lens.

Strobe light distribution lens and zoom strobe

An apparatus for controlling a magnification of an image in a camera includes a first image forming lens which forms an image of an object, an image re-forming lens which re-forms the image formed by the first image forming lens on an image pick-up surface, and a device for moving the image re-forming lens and the image pick-up surface independently along an optical axis of the image re-forming lens.

Apparatus and method for controlling magnification of image in camera

A strobe device is provided, including a light source and a reflector which reflects part of the light emitted from the light source. The reflector is provided with a reflecting surface that is shaped to form virtual images of the light source behind the reflecting surface.

Strobe device

An improved zoom strobe device is provided. When a zoom lens changes its focal length from a first length to a second length, the zoom strobe device changes its illumination angle from its minimum angle to maximum angle when the focal length of the zoom lens is changed from the first length to a third length which is smaller than the second length but greater than the first length, and then the strobe device maintains the maximum illumination angle when the focal length of the zoom lens changes between the third length and the second length.

Zoom strobe device

An optical system for a compound camera includes an equivalent image plane provided at a position substantially optically equivalent to an image plane of the photographing lens system. A condenser lens is provided proximate to the equivalent image plane and a relay lens system is provided behind the condenser lens to form an image of the photographing lens system on an image pickup device. The relay lens system satisfies the requirements defined by -0.1&lt;P&lt;0.09, and S3&lt;0, where P designates the Petzval sum of the whole relay lens system when the focal length of the relay lens system is assumed to be 1.0, and S3 designates the astigmatism coefficient of the whole relay lens system when the focal length thereof is assumed to be 1.0, respectively.

Growing community of inventors

Tokyo, Japan

Tuyoshi Ishikawa