초록 ▼

To accurately read optical information more than an opening diameter of a read opening without the read opening contacted with a reading object, in a reader for reading a bar code by irradiating light from a light source to a bar-code label, converging the reflected light through a mirror and a stop

To accurately read optical information more than an opening diameter of a read opening without the read opening contacted with a reading object, in a reader for reading a bar code by irradiating light from a light source to a bar-code label, converging the reflected light through a mirror and a stop by a lens and focusing the converged light on a line image sensor with a shutter, a wavelength detector for detecting a wavelength of the reflected light and a light guide for irradiating light spots indicative of a readable range to the label are provided. Whether a reading state is in a contact reading state in which a read opening contacts the label or in a noncontact reading state in which the read opening separates from the label is determined based on a wavelength of the reflected light detected by the wavelength detector. A light emission quantity and a shutter speed are controlled so as to keep an incident light quantity to the image sensor at an optimum value on a basis of the decided result and reflected light intensity obtained by integrating a line sensor output.

대표청구항 ▼

An optical code information reader shaped as a hand-held type to be used in contact with and away from optical code information on a read object, said reader comprising: a casing shaped to be held by hand, said casing having an opening; light source means disposed in said casing for irradiating ligh

An optical code information reader shaped as a hand-held type to be used in contact with and away from optical code information on a read object, said reader comprising: a casing shaped to be held by hand, said casing having an opening; light source means disposed in said casing for irradiating light to the read object having optical code information thereon; an optical system for converging reflected light which is reflected by said reading object to enter through the opening and for focusing information image indicative of the optical code information on a predetermined reading position, said optical system including an iris; image sensor means, having a scanning period and a shutter function and being arranged at the predetermined reading position, for converting the optical code information image into an electrical signal in accordance with the shutter function; light intensity detection means for detecting, from a value of said electrical signal of said image sensor means, an intensity of the reflected light; control means for controlling a shutter speed of said shutter function of said image sensor means in response to an output signal of said light intensity detection means so that said image sensor means operates with an optimum exposure condition; and guide light means in said casing for irradiating a guide light to said read object so that a readable image is indicated thereby without interfering with light passing through said iris.