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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0736920 (1991-07-19) |
발명자 / 주소 |
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출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 474 인용 특허 : 0 |
A hand-held bar code reader with a two dimensional image sensor for omnidirectional bar code reading, includes variable imaging optics, and flash illumination with variable flash illumination optics. A spotter beam is provided for aiming the hand held bar code reader at a bar code symbol. The spotte
A hand-held bar code reader with a two dimensional image sensor for omnidirectional bar code reading, includes variable imaging optics, and flash illumination with variable flash illumination optics. A spotter beam is provided for aiming the hand held bar code reader at a bar code symbol. The spotter beam is also used to measure the range to said bar code from said hand held bar code reader and to determine the focal length of said variable imaging optics and variable flash illumination optics. The imaging optics are adjusted automatically to provide the correct magnification and focus of a bar code regardless of range to the label. The variable focal length flash illumination optics are used to concentrate illumination energy only in the field of view of the bar code reader. The flash illumination energy is conserved by measuring the ambient light and setting the level of flash illumination energy in accordance with the measured level of ambient light. In such manner, conventional, damaged, multiple, and stacked bar codes symbols along with true two dimensional codes may be rapidly read over distances from under one foot to over several feet without having to align the bar code reader to the bar code.
In a hand held bar code reader having a two dimensional image capture means with a field of view defining an imaged area, said imaged area containing a bar code, a method of operation comprising: providing a flash of illumination forming an illuminated area, wherein said illuminated area is substant
In a hand held bar code reader having a two dimensional image capture means with a field of view defining an imaged area, said imaged area containing a bar code, a method of operation comprising: providing a flash of illumination forming an illuminated area, wherein said illuminated area is substantially coincident with and substantially equal to said imaged area over a substantial portion of the operating range of said hand held bar code reader; capturing a two dimensional image of said imaged area; and processing said captured two dimensional image in an omnidirectional manner to read out information contained in said bar code.
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