Opening detecting device of a copy document cover suitable for electrophotographic copying machine
AssigneeSharp Kabushiki Kaisha
InventorHaruo Nishiyama
Life of this patent
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Abstract
An electrophotographic copying machine having a device for detecting the opening and the closing of a document cover on a document table. The device contains a light emitting element, a light receiving element, a reflective sheet and a detection circuit. The reflective sheet reflects light from the light emitting element toward the light receiving element. The light receiving element is responsive to the reflected light for providing a detection signal. The detection circuit receives the detection signal to detect the opening and the closing of the document cover.
Claims13
A detecting device for detecting the opening and closing of a document cover means, said cover means being pivotable about an axis at one end thereof with respect to a document table means for an electrophotographic copying machine comprising:
- sensor means for sensing the opening and the closing of the document cover means said sensor means including a light emitting element and a light receiving element;
- a single light reflective means disposed on the underside of the document cover means for reflecting light from the light emitting element back toward the light receiving element;
- and
- detection means responsive to the output of the light receiving element for detecting whether the document cover means is disposed within a predetermined angular range about said axis and with respect to said document table means.
A detecting device for detecting the opening and the closing of a document cover means, said cover means being pivotable about an axis at one end thereof with respect to a document table means for an electrophotographic copying machine comprising:
- sensor means for sensing the opening and the closing of the document cover means, said sensor means including a light emitting element and a light receiving element and being adapted for tilting in synchronization with the pivotal angle of the document cover means about said axis and with respect to said table means;
- light reflective means disposed on the underside of the document cover means for reflecting light from the light emitting element back toward the light receiving element;
- and
- detection means responsive to the output of the light receiving element for detecting whether the document cover means covers or does not cover the document table means.
Dependencies are inferred from the claim text.