Abstract: A light detecting device includes: an optical filter (2) that transmits a first wavelength light having a wavelength in a first wavelength range, a second wavelength light having a wavelength in a second wavelength range, . . . , and an n-th wavelength light having a wavelength in an n-th wavelength range (n is an integer); an optical sensor (3) that detects at least one of a first wavelength light intensity of the first wavelength light, a second wavelength light intensity of the second wavelength light, . . . , and an n-th wavelength light intensity of the n-th wavelength light; and an analysis unit (4) that estimates a light intensity of light having a wavelength in a wavelength range other than at least one of the first wavelength range, the second wavelength range, . . . , and the n-th wavelength range based on at least one of the first wavelength light intensity, the second wavelength light intensity, . . . , and the n-th wavelength light intensity.

Abstract: An in-vehicle display device includes video input section into which a picture output from mobile terminal is input and display connected to video input section via video output controller and video output section. An output section of video input section is connected to an input section of image characteristics detector, an output section of image characteristics detector is connected to a first input section of image discriminator, an output section of vehicle operating state detector is connected to a second input section of image discriminator, and an output section of the image discriminator is connected to an input section of video output controller. Further, image discriminator compares an output from image characteristics detector with an output from vehicle operating state detector, and controls an output to video output controller.

Abstract: A light detecting device includes: an optical filter (2) that transmits a first wavelength light having a wavelength in a first wavelength range, a second wavelength light having a wavelength in a second wavelength range, . . . , and an n-th wavelength light having a wavelength in an n-th wavelength range (n is an integer); an optical sensor (3) that detects at least one of a first wavelength light intensity of the first wavelength light, a second wavelength light intensity of the second wavelength light, . . . , and an n-th wavelength light intensity of the n-th wavelength light; and an analysis unit (4) that estimates a light intensity of light having a wavelength in a wavelength range other than at least one of the first wavelength range, the second wavelength range, . . . , and the n-th wavelength range based on at least one of the first wavelength light intensity, the second wavelength light intensity, . . . , and the n-th wavelength light intensity.

Abstract: An in-vehicle display device includes video input section into which a picture output from mobile terminal is input and display connected to video input section via video output controller and video output section. An output section of video input section is connected to an input section of image characteristics detector, an output section of image characteristics detector is connected to a first input section of image discriminator, an output section of vehicle operating state detector is connected to a second input section of image discriminator, and an output section of the image discriminator is connected to an input section of video output controller. Further, image discriminator compares an output from image characteristics detector with an output from vehicle operating state detector, and controls an output to video output controller.

Abstract: An optical fiber light source comprises an optical fiber having at least one output end, an insulator surrounding the optical fiber, and a heater provided on the insulator, wherein output light is obtained from the at least one output end by heating the optical fiber in the insulator.