Dew sensor
First Claim
1. An apparatus for detecting a degree of dew condensation caused on a surface of a transparent plate in accordance with a variation in quantity of detected light, in which a light emitting element and a light receiving element are arranged outside of the transparent plate, a light beam from the light emitting element is introduced into the transparent plate in order to detect a light beam traveling through the transparent plate with repetition of total reflection by the light receiving element, characterized in that the transparent plate is made of a laminated glass composed of at least two sheet glasses which are bonded together through the intermediary of an intermediate film, a reflection film is provided in a part of the intermediate film, in parallel with surfaces of the sheet glasses, and a micro mirror array in which a plurality of oblique reflection surfaces inclined to the surfaces of the sheet glasses are arranged being spaced from one another, is arranged around one end of the reflection film, the light emitting element and the light receiving element being juxtaposed with each other, outside of the laminated glass in the vicinity of the other end of the reflection film, wherein the light beam from the light emitting element travels through only one of the sheet glasses with repetitions of reflection on the reflection film and total reflection on the glass surface, and the light beam is reflected through turn-back by the micro-mirror array toward the light receiving element.
3 Assignments
0 Petitions
Accused Products
Abstract
A dew condensation detecting apparatus is independent of a wavelength of a detected light beam, and has a heat capacity of the detecting apparatus body so as to miniaturize the apparatus. A light beam is introduced from a light emitting element into the transparent plate and travels through the transparent plate with repetitions of total reflection. It is then detected by a light receiving element to detect a degree of dew condensation on a surface of the transparent plate in accordance with a variation in detected light quantity. The transparent plate is formed of two sheet glasses bonded to each other by an intermediate film, a part of which is a reflection film. A micro-mirror array for turn-back reflection, composed of oblique reflection surfaces inclined to the surfaces of the spaced sheet glasses, is provided near one end of the reflection film.
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Citations
10 Claims
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1. An apparatus for detecting a degree of dew condensation caused on a surface of a transparent plate in accordance with a variation in quantity of detected light, in which a light emitting element and a light receiving element are arranged outside of the transparent plate, a light beam from the light emitting element is introduced into the transparent plate in order to detect a light beam traveling through the transparent plate with repetition of total reflection by the light receiving element,
characterized in that the transparent plate is made of a laminated glass composed of at least two sheet glasses which are bonded together through the intermediary of an intermediate film, a reflection film is provided in a part of the intermediate film, in parallel with surfaces of the sheet glasses, and a micro mirror array in which a plurality of oblique reflection surfaces inclined to the surfaces of the sheet glasses are arranged being spaced from one another, is arranged around one end of the reflection film, the light emitting element and the light receiving element being juxtaposed with each other, outside of the laminated glass in the vicinity of the other end of the reflection film, wherein the light beam from the light emitting element travels through only one of the sheet glasses with repetitions of reflection on the reflection film and total reflection on the glass surface, and the light beam is reflected through turn-back by the micro-mirror array toward the light receiving element.
Specification