Optoelectronics Co., Ltd.

Opticon, Inc.

Zhihui Duan

Masaki Kurokawa

Hiroshi Hayakawa

Depei Ji

Masayoshi Yamanouchi

Wataru Kubo

Kazuto Kimura

Kazunori Noborio

Yo Tanaka

A barcode reader, as an optical information reader which reads information indicated with a symbol having a light reflectance different from an ambient light reflectance, is provided with a linear sensor as a light receiving sensor, an image pickup lens to image-form light on the linear sensor, an LED as a light emitting device, a projection lens to project light emitted from the LED, a parting portion to regulate a light projection range of the light emitted from the LED, having a first opening and a second opening to shield light out of a predetermined range, a central position of the predetermined range being shifted from position of an optical axis of the projection lens to a side of an optical axis of the image pickup lens.

Optical information reader and illuminating method

In a barcode reader, a sensor controller sets time of one frame of a line image sensor based on output time necessary for data output of one frame from the line image sensor and lighting time of an LED. A light source controller performs first lighting control to turn on the LED only for the lighting time after termination of the data output within the time of one frame, and second lighting control to turn on the LED only for the lighting time so as to include the entire period of the data output within the time of one frame.

Optical information reader and illumination control method

A code symbol reading apparatus, that reads a code symbol on an object to be read by scanning the object, repeats trial to read the code symbol until the apparatus succeeds in reading, while changing a transmission frequency of a filter that processes a signal representing a light intensity variation obtained through the scan and in which transmittance depends on a frequency of the signal.

Code symbol reading apparatus, code symbol reading method and medium

An optical aberration is intentionally introduced into the optical system which produces the scanning beam of an optical code scanner, in order to produce a scanning beam which has plural focal points or waists at different distances from the scanner. The operating range of the scanner can thereby be increased by taking advantage of different beam waist locations when the optical code is at different distances from the scanner. In accordance with an embodiment of the invention, coma is intentionally introduced to an optical system providing a light beam for an optical code scanner. This provides a scanning beam with plural beam waists at different distances from the scanner. This may be accomplished by orienting the light source and focusing optical system so that their optical axes intersect or by introducing an optical member, such as a prism, between the original light source and the focusing optical system.

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Saitama, Japan

Zhihui Duan