Smoke detector with a conical ring-shaped radiation region

Claim 2

A smoke detector comprising: a radiation source comprising a radiation emitting element for emitting radiation throughout an extended spatial region; said radiation source further comprising optical means structured to focus the predominant part of the radiation into a substantially conical ring-shaped radiation region in order to thereby increase the efficiency of smoke detection; a radiation receiver arranged to receive radiation scattered by particles located in the substantially ring-shaped radiation region; and said radiation receiver being located substantially along the cone axis.

Claim 3

The smoke detector as defined in claim 1, wherein: said optical means comprising at least one optical deflecting surface generated by revolution of a conical section curve around said cone axis.

Claim 4

The smoke detector as defined in claim 2, wherein: said conical section curve is generated by an eccentrical revolution of a conical section curve around said cone axis.

Claim 5

The smoke detector as defined in claim 2, wherein: said conical section curve is generated by a slanted revolution of a conical section curve around said cone axis.

Claim 6

The smoke detector as defined in claim 1, wherein: said radiation source transmits the radiation throughout a large aperture angle.

Claim 7

The smoke detector as defined in claim 2, wherein for producing said substantially conical ring-shaped radiation region: said optical means provide ellipsoid surfaces of revolution containing substantially elliptical generatrixes enclosed by predetermined primary radii of curvature.

Claim 8

The smoke detector as defined in claim 6, wherein: said predetermined radii of curvature are the same.

Claim 9

The smoke detector as defined in claim 6, wherein: said predetermined radii of curvature are infinite.

Claim 10

The smoke detector as defined in claim 6, wherein: said ellipsoid surfaces of revolution are refractive surfaces.

Claim 11

The smoke detector as defined in claim 6, wherein: said ellipsoid surfaces of revolution are reflective surfaces.

Claim 12

The smoke detector as defined in claim 1, wherein for producing said substantially conical ring-shaped radiation region there is provided: said optical means in the form of a body of revolution of a lens section having a predetermined axis of rotation.

Claim 13

The smoke detector as defined in claim 11, wherein: said axis of rotation is eccentric and slanted with respect to said cone axis.

Claim 14

The smoke detector as defined in claim 2, wherein for producing said substantially conical ring-shaped radiation region: said optical means embody means providing a respective reflecting ellipsoid surface of revolution and a refractive ellipsoid surface of revolution containing eccentric and slanted rotational axes.

Claim 15

The smoke detector as defined in claim 1, further including: at least one radiation-screening diaphragm arranged between said radiation source and said radiation receiver.

Claim 16

The smoke detector as defined in claim 14, wherein: said diaphragm comprises a body having a blackened surface and arranged approximately at the lengthwise axis of the smoke detector; said body being constructed to possess substantially ring-shaped shoulders.

Claim 17

The smoke detector as defined in claim 1, further including: a radiation-conductive body arranged in front of the radiation receiver; said radiation-conductive body being provided with substantially ring-shaped entry surfaces for scattered light and substantially funnel-shaped tapering reflection surfaces.

Claim 18

The smoke detector as defined in claim 1, further including: a socket plate; an insert member provided for said socket plate; means incorporating said optical means provided for the radiation emitting element for producing the substantially conical ring-shaped radiation region and arranged in said insert member mounted at said socket plate; a support element arranged along the lengthwise axis of the smoke detector and mounted at the insert element; said radiation receiver being mounted at said support element; spacer pin means carrying screening diaphragm means; said spacer pin means being provided between said radiation source and said radiation receiver; said insert member and said support element being mounted at said socket portion; a housing mounted at said socket portion; and said housing being provided with air inlet openings.

Claim 19

The smoke detector as defined in claim 17, wherein: said housing has an inner surface which is lined with an air pervious, open pore foam material.

Claim 20

The smoke detector as defined in claim 6, wherein: said optical means provides an additional refractive ellipsoid surface of revolution having a predetermined axis of rotation, and the elliptical generatrixes of which are enclosed by predetermined primary radii of curvature; said additional surface of revolution containing a reflecting surface and two refractive surfaces arranged and constructed such that the radiation transmitted by said radiation-emitting element in the direction of the reflecting surface in conjunction with one of the refractive surfaces is focused within a substantially conical jacket-shaped zone and the radiation transmitted by the radiation-emitting element in the direction of the other refractive surface is focused in the same substantially conical jacket-shaped zone.

Claim 21

The smoke detector as defined in claim 19, wherein: said additional refractive ellipsoid surface of revolution has an eccentric and slanted axis of rotation.

Claim 22

The smoke detector as defined in claim 19, wherein: said primary radii of curvature are equal to one another.

Claim 23

The smoke detector as defined in claim 19, wherein: said primary radii of curvature are infinite.

Claim 24

The smoke detector as defined in claim 19, wherein: said radiation-emitting element is located at the focal point of the generatrix of the reflecting surface.

Claim 25

The smoke detector as defined in claim 19, further including: means defining a refracting surface portion; a radiation-refractive medium arranged between said refracting surface portion and both of said refractive surfaces.

Claim 26

The smoke detector as defined in claim 24, wherein the radiation-refractive medium comprises a transparent plastic.

Claim 27

The smoke detector as defined in claim 19, further including: a radiation-refractive medium filling an intermediate space between the reflecting surface and the refractive surfaces.

Claim 28

The smoke detector as defined in claim 26, wherein: said radiation-refractive medium comprises a transparent plastic.