Abstract: An electronic device mounting structure, which allows threaded engagement with a standardized male screw compliant with the JIS, DIN or the like without having to perform tapping on a plate material, includes an engagement hole having first and second cutouts formed in a peripheral edge section thereof, wherein the peripheral edge section of the engagement hole is deformed in the plate thickness direction such that there is a positional deviation from a first peripheral edge end section bordering on the first cutout toward a second peripheral edge section bordering on the second cutout by approximately one half of the pitch of a standardized male screw compliant with the JIS and a further positional deviation from a third peripheral edge end section bordering on the second cutout toward a fourth peripheral edge end section bordering on the first cutout by approximately one half of the pitch, with the result that there is a positional deviation corresponding to one pitch of the male screw between the first and

Abstract: An optical operating device is provided on an operation panel of an audio system or the like, including a recess formed on the operation panel; several light receiving portions are formed on a first inside surface of the recess and arranged in a longitudinl direction of the recess; several light emitting portions are formed on a second inside surface of the recess opposed to the first inside surface, with each light emitting portion corresponding to a light receiving portion. Several light paths thus pass from the light emitting portions across the recess to the light receiving portions, and the light paths are arranged in the longitudinal direction of the recess. A light source supplies the light to each light emitting portion, and a photo detector is connected to the light receiving portions for generating a predetermined signal according to the light emitted from the light emitting portions and received by the light receiving portions.