| 摘要 |
An electrostatic non-contacting writing apparatus adaptable for use in a coherent optical processor comprising writing, developing, readout and erasing stations disposed proximate to and consecutively spaced along the direction of motion of a continuous transparent tape. In operation of the processor a time-varying electrical signal is written on the tape in the form of a spatially distributed electrostatic charge pattern by means of a two-step uniform precharging and subsequent partial erasure technique. The tape is then exposed to an oppositely charged cloud of toner particles at the developing station whereupon the electrostatic charge pattern is converted to a visible image of varying transparency by virtue of the toner adhering to selective regions of the tape. Optical processing is performed as the visible image passes the readout station whereat it intersects a laser beam and thereafter the toner image is erased from the tape in readiness for the next cycle of operation commencing at the writing station.
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