Abstract: A bar code reader includes a laser source for emitting a laser beam, and a scan device for scanning a bar code with the laser beam according to a predetermined scanning pattern. A window passes the laser beam from the scanning device toward the bar code which is in the vicinity of the window. A condenser condenses reflected light return from the bar code through the window and scanning device along the route traced by the laser beam. A photosensor detects the condense light and provides an electric signal which is proportional to the intensity of the detected light. A main body accommodates the laser source, the scanning device, the window, the condenser, and the photosensor. A cover is attached to the main body, and has an opening corresponding to the window. A buzzer is provided, to create a buzzing sound which resonates in a space formed between the main body and the cover.
Abstract: The invention provides a control system responsive to a data-bearing record that has two electrodes configured so that one of the two is either in physical contact with, or is at least more nearly proximate, a reader plate than is the other electrode. The reader portion of the system may use a pulsed capacitive apparatus both to sense the object or user's proximity and thereafter for data communication with the escort apparatus e.g., to receive data representative of a bearer's identity. A preferred data bearing escort apparatus is powered by electrical voltage pulses generated by the reader. This preferred escort apparatus comprises a microcomputer and a non-volatile escort memory, but does not contain a battery. Moreover, because the electrodes disposed on the data-bearing record can be very thin, as well as being proscribed in lateral extent, the data-bearing record may be conveniently small.