Range finder having a plurality of signal reception means
AssigneeCanon Kabushiki Kaisha
InventorRyoichi Suzuki
Life of this patent
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Abstract
A range finder that measures a distance to an object by projecting a signal and receiving it back has a signal projection device for projecting a signal, a first reception device for receiving a reflected signal of the projected signal which is reflected in a range from a near distance to a far distance, and a second reception device for receiving a reflected signal of the projected signal which is reflected from distant objects, in which range finder the distance measurement accuracy is enhanced and no decrease in an overall distance measurement accuracy occurs.
Claims23
A range finder that measures a distance to an object by projecting a signal and receiving a reflected signal back comprising:
- signal projection means for projecting said signal;
- first signal reception means for receiving a reflected signal of the projected signal which is reflected from the object when the object is at a point in a range from a relatively near distance to a relatively far distance from said range finder;
- and
- second signal reception means for receiving only a reflected signal of the projected signal which is reflected from the object when the object is located at a point which is at the relatively far distance.
A range finder that measures a distance to an object by projecting a signal and receiving a reflected signal back comprising:
- signal projection means for projecting said signal;
- first signal reception means for receiving a reflected signal of the projected signal which is reflected from the object when the object is at a point in a range extending from a relatively near distance to a relatively far distance from said range finder;
- second signal reception means for receiving only a reflected signal of the projected signal which is reflected from the object when the object is located at a point which is at the relatively far distance;
- and
- calculation means for calculating the distance to the object as a function of at least one of the outputs of said first signal reception means and said second signal reception means.
Dependencies are inferred from the claim text.