Patent ID: 8439266
Filing Date: 2013-05-14
Classification: G02B,G03B,G06K

Abstract:
1. An optical-information-reading apparatus comprising: an imaging optical system including a varifocal lens which adjusts a focal position; an image sensor that images an imaging target of which the imaging optical system performs an image formation; a distance-measuring system that measures the distance to the imaging target; and a control unit that is operable to: (i) calculate the distance to the imaging target using the distance-measuring system, (ii) control the imaging optical system based on calculated distance information to perform the image formation of the imaging target on the imaging means, and (iii) control the image sensor to image the imaging target, wherein the control unit calculates the distance to the imaging target using a distance measurement parameter that is characteristic of the apparatus and which has been previously been determined and stored in a memory that is accessible to the control unit; wherein the distance-measuring system includes a light-emitter for irradiating the imaging target with light; wherein a distance measurement parameter comprises location information of the distance-measuring system in relation to an optical axis of the imaging optical system, the optical axis passing through an imaging surface of the imaging sensor; and wherein the control unit calculates, by the distance-measuring system, a location where irradiating light reflected by the imaging target is incident on the image sensor and the distance to the imaging target using the location information.