An optical encoder is constructed by a reflection-type scale 1 and a sensor head 4. The drive cage may be a redundant array of independent disks storage shelf and the drive may be a hard disc drive suitable for being received in the drive cage. These three parts also form the device package. The light source placement portion has a placement surface, the placement surface is formed such that the placement surface is raised with respect to the light source placement portion and the light source module is placed on the placement surface. The remote and local capture information may also include cameras that capture video information or still image information and combines those parts together, either with each other, or with another part.