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US 10,705,212 B2Granted
Optical sensor and electronic device
AssigneeSharp Kabushiki Kaisha
InventorsHideki Sato, Yoshiki Ikuta, Takayuki Shimizu, Takuma Hiramatsu
Life of this patent
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Abstract
An optical sensor includes a time difference extraction circuit for extracting a time difference based on the distance to a target on the basis of a first received light pulse signal from a first light receiving unit, a reference cycle, and a second received light pulse signal from a second light receiving unit, and a determination circuit for determining whether a crosstalk value can be calculated on the basis of the time difference extracted by the time difference extraction circuit and the reference cycle.
Claims7
An optical sensor comprising:
- a reference pulse generation circuit that generates a reference pulse signal;
- a light emitting element that emits light toward a target based on the reference pulse signal;
- a cover panel that transmits a part of the light and reflects the other part;
- a photo-count type first light receiving element that is provided so as to receive target reflection light reflected by the target and cover panel reflection light reflected by the cover panel;
- a photo-count type second light receiving element that is disposed closer to the light emitting element than the first light receiving element and receives the cover panel reflection light, reflection light from inside a sensor package, and direct light from the light emitting element;
- a time difference extraction circuit that extracts a time difference based on a distance on a spatial light path to the target on the basis of a first received light pulse signal from the first light receiving element, a reference cycle based on the reference pulse signal, and a second received light pulse signal from the second light receiving element;
- and
- a determination circuit that determines, based on the time difference extracted by the time difference extraction circuit and the reference cycle, whether a crosstalk value representing a component amount of the cover panel reflection light is calculated.
5 more elements
Dependencies are inferred from the claim text.