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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0569728 (1995-12-08) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 대리인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 374 인용 특허 : 0 |
An optical device for reading one- and two-dimensional symbologies at variable depths of field, the device including a light source for projecting an emitted light towards the two-dimensional image and an optical assembly, or zoom lens, with dual field of view capability for focusing light reflected
An optical device for reading one- and two-dimensional symbologies at variable depths of field, the device including a light source for projecting an emitted light towards the two-dimensional image and an optical assembly, or zoom lens, with dual field of view capability for focusing light reflected from the framed symbology onto a CCD detector for detecting the focussed light and generating a signal therefrom. The dual field of view capability enables scanning of both wide and narrow fields of view. An apodizing filter is provided within the optical assembly to increase depth of field. Aiming of the sensor to read the symbology is facilitated by a frame locator including a laser diode which emits a beam that is modified by optics, including diffractive optics, to divide the beam into beamlets having a spacing therebetween that expands to match the dimensions of the field of view of the sensor, forming points of light at the target to define the edges of the field of view. One or two sets of diffractive optics may be provided, with one set corresponding to each position, for each of the dual field of view positions of the zoom lens.
[ We claim:] [1.] An optical scanning device for reading a one- or two-dimensional symbology having a first width, said optical scanning device comprising:at least one printed circuit board having a front edge with a second width;a light source mounted on said at least one printed circuit board, sai
[ We claim:] [1.] An optical scanning device for reading a one- or two-dimensional symbology having a first width, said optical scanning device comprising:at least one printed circuit board having a front edge with a second width;a light source mounted on said at least one printed circuit board, said light source for projecting an incident beam of light onto said symbology, said incident beam of light having substantially said second width at said front edge of said at least one printed circuit board and a first height and a third width at said symbology, said third width being greater than said second width and at least as large as said first width:an optical assembly comprising a plurality of lenses disposed on said at least one printed circuit board along an optical path for receiving and focusing light reflected from said framed symbology to obtain a focused light at a focal plane, said optical assembly having moving means for moving at least one of said plurality of lenses with respect to other lenses of said plurality to provide a variable field of view;at least one framing means disposed on said at least one printed circuit board for framing said symbology to identify an area to be scanned by said scanner, wherein said at least one framing means comprises at least one laser diode for emitting a laser beam and at least one diffractive optic for transforming said laser beam into a plurality of diverging beamlets, said diverging beamlets having a beamlet spacing at said symbology at least as large as said first width, wherein said at least one framing means comprises a first framing means and a second framing means, the first framing means corresponding to a wide field of view and the second framing means corresponding to a narrow field of view;a detector disposed on said at least one printed circuit board within said optical path substantially at said focal plane of said optical assembly for detecting at least a portion of said focused light within said variable field of view of said detector, said variable field of view having said first height and said third width, said detector for sensing said focused light to obtain a sensed symbology;a processor for processing said sensed symbology to obtain an electrical signal; andan output means for converting said electrical signal into output data.
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