Abstract: A magnetic sensor includes first and second bridge circuits. The first bridge circuit includes a first group of magnetoresistive elements connected in a bridge. The first bridge circuit outputs a first detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the first group. The second bridge circuit includes a second group of magnetoresistive elements connected in a bridge. Each magnetoresistive element of the first and second bridge circuits is formed by a sensor element bent in a serpentine manner. The second bridge circuit outputs a second detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the second group and having a waveform that has a sine-cosine relationship with the first detection signal. The sensor elements of the first and second bridge circuits are arranged along a circumference of part of a circle about a center of the sensor elements.

Abstract: A magnetic sensor includes first and second bridge circuits. The first bridge circuit includes a first group of magnetoresistive elements connected in a bridge. The first bridge circuit outputs a first detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the first group. The second bridge circuit includes a second group of magnetoresistive elements connected in a bridge. Each magnetoresistive element of the first and second bridge circuits is formed by a sensor element bent in a serpentine manner. The second bridge circuit outputs a second detection signal corresponding to a magnetic field detected by the magnetoresistive elements in the second group and having a waveform that has a sine-cosine relationship with the first detection signal. The sensor elements of the first and second bridge circuits are arranged along a circumference of part of a circle about a center of the sensor elements.

Abstract: A first bent portion whose extending direction changes in the order of +z, +x, +z, ?x, and +z is formed in a first current path, wherein a direction in which two current paths extend in parallel as the z-direction of the x-y-z orthogonal coordinate system and a second bent portion whose extending direction changes in the order of +z, +y, +z, ?y, and +z is formed in a second current path. Either one of the z-coordinate range of the middle part of the first bent portion and the z-coordinate range of the middle part of the second bent portion includes the other one and a magnetic flux density detection device that detects the x-direction magnetic flux density and the y-direction magnetic flux density is disposed within the included z-coordinate region.

Abstract: A single light source arranged in the central portion of an operation device illuminates operation portions and illumination windows of the operation device. The light emitted from the light source is reflected by a reflection surface of an elastic sheet into an inner side surface of a light guide plate. The light guide plate includes a plurality of light redirection areas for redirecting the light toward the illumination windows.