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    • 65. 发明专利
    • PHOTOSENSOR ASSEMBLY
    • JPS607414A
    • 1985-01-16
    • JP11556783
    • 1983-06-27
    • FUJITSU LTD
    • AMAKO ATSUSHIIGAKI SEIGONAKAKUKI TADAOINAGAKI YUUSHI
    • G07D7/00G02B17/00G07D7/20
    • PURPOSE:To increase the acquisition efficiency of a pattern signal and to improve resolution and stability by positioning a run surface for paper, etc., at the distant focal point of a reflecting mirror which has an ellipsoidal concave surface of revolution, and providing the photodetection surface of a photosensor at the close focal point without facing a light source. CONSTITUTION:A projected light beam from the light source 1 is diffused by the surface of paper 3, etc., at a focal point F1. The majority of light transmitted through the paper 3, etc., is converged by the reflecting mirror 4 to a focal point F2 and strike the photodetection surface of the photosensor 2. Namely, when the diameter of the projection light beam is larger than the photosensor, the projection light beam is converged sufficiently and strike a part other than the photodetection surface of the photosensor, i.e. a back surface. When the paper 3, etc., are not present, none of the projection light beam strikes the photodetection surface of the photosensor 2. Consequently, the dynamic range of a signal detection processing circuit system is set narrow and the resulution of pattern detection signal waveform is improved.
    • 66. 发明专利
    • PERMEATION TYPE OPTICAL SENSOR
    • JPS5994095A
    • 1984-05-30
    • JP20480682
    • 1982-11-22
    • FUJITSU LTD
    • AMAKO ATSUSHIIGAKI SEIGONAKAKUKI TADAOINAGAKI YUUSHIOIKAWA SHIYUUETSU
    • G01V8/12G01V8/14G01V9/04
    • PURPOSE:To make it possible to reduce the output ratio of a sensor, by providing a second filter which is positioned at the light source side of a medium feed path and reaches a predetermined distance toward the inner side from the inner wall surface of a sensor body to the sensor side of the space filter provided on the light axis between a light source and the sensor. CONSTITUTION:A permeation type optical sensor 1 consists of a light feed side sensor part 3 and a light receiving side sensor part 4 provided so as to hold a feed surface 2 on which a medium to be sensed is fed therebetween. The light feed side sensor part 3 consists of a sensor main body 6 of which the inner wall surface 5 has light reflective property, a light source 7 provided in said main body 6, a first space filter 8 provided on the light axis between the light source 7 and the light receiving element of light receiving side sensor part 4, a dust cover 9 provided to the side end of the light receiving side sensor part 4 of the main body 6 and a second space filter 10 which is positioned at the side of the light source 7 of the cover 9 and reaches a predetermined distance from the inner wall surface 5 of the main body 6 over the entire periphery thereof.