| 摘要 |
PURPOSE:To obtain high range finding accuracy by easy constitution by using a device wherein semiconductor chips are mounted on the step parts formed to a lead frame as a light emitting source. CONSTITUTION:Step parts 21a are formed on a lead frame 21 by a press or a punch and LED chips are bonded to the interiors of the step parts 21a to form light emitting sources 14, 15, 16. These light emitting sources are used as those of a range finder. Since the lights to the rear from the light emitting sources 14, 15, 16 are reflected by the step parts 21a to be projected forwardly, the use efficiency of light is high and, since the whole of the step parts becomes the light emitting source, the position of the light emitting source is accurately determined and range finding accuracy is enhanced. |
