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US 5,179,269 AGranted
Bar code reader having an automatically actuated visible light laser beam
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsMikio Horie, Mitsunori Iima
Life of this patent
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Abstract
A wand type bar code reader has a semiconductor laser which emits a visible laser beam in order to read bar code information of an object based on scanning of the visible laser beam and a control and drive circuit which controls the semiconductor laser, whereby the semiconductor laser is automatically repeated ON and OFF at predetermined time intervals.
Claims4
A wand type bar code reader having:
- a semiconductor laser emitting a laser beam in order to read bar code information of an object based on scanning of said laser beam;
- a control and drive circuit which controls said semiconductor laser, whereby said semiconductor laser is automatically repeatedly turned ON and OFF;
- said control and drive circuit turning said semiconductor laser OFF at once and prohibiting turning ON of said semiconductor laser until a first predetermined OFF time interval passes when data is read correctly, and turning said semiconductor laser OFF after a predetermined ON time interval passes and prohibiting turning ON of said semiconductor laser until a second predetermined OFF time interval passes when data is not read correctly in a predetermined ON time interval, said second predetermined OFF time interval being longer than said first predetermined OFF time interval.
Dependencies are inferred from the claim text.