Nittan Company Limited

Lixil Nittan Company, Limited

Kazuyoshi Sakurai

Nobuyuki Akiyama

Ichiro Hamada

Yasunori Oya

Hiroshi Kaneko

Seiji Tsubouchi

Akihisa Kudoh

Masahiro Katagiri

Ryuichi Yamazaki

Yasuhiro Sugano

A flame detector is provided. A circuit board is disposed in a housing. A first light source emits first light. A light guide member comprised of translucent material guides the first light from the first light source to a light emission portion of the light guide member. A first light receiving element detects second light having a predetermined wavelength unique to the flames. A second light source emits third light to a translucent cover which is disposed between an opening of the housing and the first light receiving element. A second light receiving element detects the third light passed through the translucent cover to test the translucency. The first light source, the second light source and the second light receiving element are mounted on the circuit board. The light emission portion is formed into a substantially annular shape which encloses the first light receiving element at a front side of the housing to limit a field of view of the first light receiving element to a predetermined range. And the light guide member has a light entrance portion and a light exit portion for the third light to form a light path from the second light source to the second light receiving element through the translucent cover and the light guide member.

Flame detector

Fire detector

A fire detector which can be observed an operating state thereof from every direction and decrease a cost thereof as possible. The fire detector (,) comprises: the circuit board (,) in which the circuit for detecting a fire is formed; the LED (,) which is surface-mounted on the circuit board (,); and the indication lamp for indicating the fire detector being under detection by emitting the light emitted from the LED (,), wherein the indication lamp comprises the light guide member (,) for introducing the light emitted from the LED (,) to the indication lamp with a ring shape, the light guide member (,) comprises the light incident parts (,) and (,) and the ring member (,), notches (,) and (,) are formed in the vicinity of the light incident parts (,) and (,) of the ring member (,), and a plurality of small grooves (,), and (,) . . . are formed in the bottom surface (,) of the ring member (,).

The fire detector for sensing a fire, comprises; a smoke chamber, a light emitting element, and a light detecting element for detecting a scattered light caused by scattering a light emitted by the light emitting element with a smoke which enters in the smoke chamber, wherein a wall part of the smoke chamber is formed in a shape based on a circle having a predetermined size, and comprises a projecting portion which projects from at least a part of the circle to an outside of the circle, the light emitting element is disposed on the projecting portion of the smoke chamber, and the light detecting element is arranged out of the smoke chamber and an optical axis thereof is approximately perpendicular to a plane including the circle.

An ionization smoke detector comprising: an inner electrode; an intermediate electrode having an electrode body and an electrode piece extending from the electrode body, facing the inner electrode and connected to a field effect transistor; an outer electrode provided in an opposite side to the inner electrode with respect to the intermediate electrode; and an insulating supporter for supporting the intermediate electrodes to face the inner electrode. The supporter comprises an electrode supporting portion for supporting the intermediate electrode, having a cylindrical peripheral wall to enclose the electrode body of the intermediate electrode, a container for containing the field effect transistor, and a container supporting member for supporting the container by connecting it to the electrode supporting portion; a first notch portion for extending the electrode piece of the intermediate electrode out thereof is formed in the cylindrical peripheral wall, and a second notch portion for extending a lead wire of the field effect transistor stored in the container out of the container is formed at a position facing the first notch portion of the peripheral wall; and the electrode piece extending from the first notch portion is connected to the lead wire extending from the second notch portion.

Growing community of inventors

Tokyo, Japan

Kazuyoshi Sakurai