Ink-type recording apparatus detecting ink-end mark with appropr

Details Ink-type recording apparatus detecting ink-end mark with appropr Ink-type recording apparatus detecting ink-end mark with appropr

1995-05-09

1998-05-19

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Controller

347 7, B41J 29393

Patent

active

057541957

ABSTRACT:
There is provided an ink-type recording apparatus in which an intensity of light emitted by a photoelectric sensor is controlled to fall within an appropriate range so as to detect an ink-end mark at an appropriate sensitivity. A light-emitting element emits light toward a recording paper. A light-receiving element converts an intensity of the received light into an output current having a level corresponding to the intensity of the light. A current/voltage converting unit converts the output current into a voltage. A digitizing unit digitizes a level of the voltage into a digital value which is one of consecutive numbers from 0 to a predetermined maximum number. A ratio of the digital value to the predetermined maximum number is calculated. An input current supplied to the light-emitting element is varied so that an intensity of the light emitted by the light-emitting element is varied in accordance with the ratio.

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