Casio Computer Co., Ltd.

Harada Industry Co., Ltd.

Minoru Fujiwara

Tetsuo Muto

Makoto Sasaki

Hiromitsu Ishii

Yasuhiro Daiku

Masaru Higuchi

Junichi Kawahata

Yutaro Tanaka

Metal fitting for connecting electric wires

A light beam emitted by a surface illuminant reaches the surface of a transparent base layer of a recess/projection detection optical element. A light beam emitted almost vertically is emitted to an air layer. A light beam incident on the transparent base layer at an angle larger than a total reflection angle returns to a two-dimensional photosensor at a portion contacting the air layer, but scatters in a transparent particle at a portion contacting the transparent particle. When a finger is brought into contact with a scattering reflection layer, the scattering reflection state does not change in an area corresponding to a valley of a fingertip. As indicated by an arrow, an amount of reflected light beam is large. In an area corresponding to a ridge of the fingertip, the light beam scattered by the transparent particle is absorbed. The amount of reflected light beam is small, as indicated by an arrow. An image having bright and dark portions optically emphasized in correspondence with the valley and ridge of the fingertip of the finger can be obtained.

Apparatus for reading fingerprint

An illumination panel comprises a light source, a photoconductor for guiding light from the light source, and an optical film for emitting light emitted from the photoconductor ahead of an observer. The photoconductor comprises a stepwise face having an incident end face onto which the light from the light source is projected, step faces, and step differentiating faces for emitting the light guided from the light source and connecting the step faces, and reflective films formed on the step faces. The optical film is arranged at the front side of the photoconductor, and has projected incident portions which are opposite to the step differentiating faces in a light emitting direction. The optical film emits the light emitted from the step differentiating faces ahead, and causes the light that is projected from the front to be reflected ahead on reflective faces on the step faces. In the incident portions, one of side faces opposite to the step differentiating faces of the photoconductor makes an incident face for receiving the light emitted from the step differentiating faces, and the other makes a refractive face for reflecting/refracting the light taken in the incident face toward its front face. A liquid crystal display element is arranged at the front of this illumination panel so that they constitute a liquid crystal display device.

Illumination panel and display device using the same

Growing community of inventors

Tokyo, Japan

Minoru Fujiwara