Kabushiki Kaisha Toshiba

Toshiba Tec Kabushiki Kaisha

Toshiba Materials Co., Ltd.

Hiromichi Hayashihara

Masataka Shiratsuchi

Hiroshi Ohno

Takeshi Morino

Mitsuaki Kato

Yoshinori Honguh

Yuichiro Yamamoto

Hideo Tamura

Masahiko Yamamoto

Katsumi Hisano

Yasumasa Ooya

Tomonao Takamatsu

Hiroyasu Kondo

Masatoshi Hirono

Ryoji Tsuda

In one embodiment, an illumination device includes a light-guiding unit having a light output surface which outputs light and a back surface facing the light output surface, wherein the light-guiding unit has a curved surface in a region of the back surface farther than a first position on the back surface that is away by a first distance from an axis passing the light output surface and the back surface, and a rough surface in a region of the light output surface farther than a second position on the light output surface that is away by a second distance from the axis in a same direction as a direction from the axis toward the first position, and where an intersection of the axis and the back surface is an origin point, and a direction of the axis from the back surface to the light output surface is positive, a normal line of the curved surface intersects with the axis at the positive side of the axis, and an angle formed by a normal line vector at the second position in a direction toward the light output surface from the back surface of the light output surface and a vector in a direction from the curved surface to the second position is equal to or more than a critical angle.

Illumination device and light-guiding member

A lighting apparatus according to an embodiment includes a globe, an optical element including a scattering portion inside and transparent to visible light, and a light source disposed to be opposed to a light incident surface of the optical element. The scattering portion is disposed inside the globe.

Lighting apparatus

An LED lighting device of embodiment comprising an LED light source which generates an ultraviolet light or a visible light, an axisymmetric transparent member which is provided over the light source and which is transparent to visible light, and an axisymmetric light scattering member disposed in the transparent member apart from the light source. A distance of closest approach Lbetween the light source and the light scattering member, and an area C of a light emitting surface of the light source satisfy the settled relation. A length Lof the light scattering member, and an absorption coefficient &#x3bc; (1/mm) of the light scattering member satisfy the settled relation. A diameter dof the bottom surface of the light scattering member, the distance of closest approach Land a refractive index n of the transparent member satisfy the settled relation.

LED lighting device

A recording media deciding apparatus has: a light radiating portion which radiates light having a uniform light amount on a range corresponding to an image capturing range of a first surface of a bundle of recording media; a light detecting portion which captures an image of light emitted from a second surface different from the first surface of the bundle of the recording media; and a controller which decides on a type of the recording media based on an output of the light detecting portion.

Method and apparatus for deciding recording media based on light from a linear light source that passes a slit in a light shielding portion

According to one embodiment, a sheet type determination apparatus includes a tray, light source, detection unit, database, and operation unit. The tray is configured to hold a sheet bundle formed by stacked sheets. The light source emits illumination light to a first region. The detection unit detects a light intensity distribution of transmitted light emerging from a second region. The transmitted light is generated as the illumination light passes through the sheet bundle, and the second region is different from the first region. The database stores a table describing a relation between reference attenuation rates and types. The operation unit is configured to calculate an attenuation rate of the transmitted light based on the light intensity distribution, and determine a type of the sheets by comparing the attenuation rate with the reference attenuation rates.

Apparatus and method of determining the type of paper sheet, and image formation apparatus

A record medium determining device, which determines a kind of a record mediumby irradiating a laser lightto a surface of the record medium, detecting a received light position and a received light intensity of a reflected lightby a line sensor, and comparing a distribution state of the received light position and the received light intensity with a previously determined distribution state, is disposed on the upstream side of a record medium conveyance pathwith respect to a fixing unit.

Image forming apparatus for forming image on record medium

Image forming apparatus with a line sensor and a method of image forming of an image forming apparatus with a line sensor

In a discriminating apparatus, a substrate portion of printed matter is irradiated with a light beam emitted from a light source, and the intensity of the light beam reflected from the substrate is detected by a photodetector. The discrimination as to whether the printed matter is the original or a reproduction is performed by a discriminating unit based on the contrast value in the intensity of the reflected light detected by the photodetector. Thus, the discriminating apparatus discriminates whether the printed matter is the original or a reproduction at high speed and also permits lowering the possibility of an erroneous discrimination.

Discriminating apparatus

Image forming apparatus with a laser record medium detecting device

A sheet thickness measuring device includes: an illumination unit that outputs a light that is illuminated into a stack of sheets from a first area defined on one of faces including a top face, a bottom face, and side faces of the stack of sheets; a detection unit that detects a light amount distribution of light entered into the stack of sheets and propagated to a second area through the stack of sheets, the second area defined on one of the side faces of the stack of sheets; and a calculation unit that calculates a thickness of a sheet in the stack of sheets based on the light amount distribution detected by the detection unit.

Sheet thickness measuring device and image forming apparatus

A laser beam is irradiated on a record medium, a speckle generated by surface scattering is measured by an image sensor, speckle information obtained is subjected to FFT transform, and a paper quality of the record medium is discriminated from a peculiar pattern due to roughness of the surface of the record medium.

Growing community of inventors

Yokohama, Japan

Hiromichi Hayashihara