Optical symbol scanner with low angle illumination
DC
First Claim
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1. An optical symbol scanner assembly for detecting and decoding a symbol lying on a surface of an article, comprisinga scanner device having a distal face on which is positioned a light-generating means for producing illumination to fall on said symbol, and focusing means for focusing an image of said symbol on an imager device positioned proximally thereof in said scanner device, said focusing means defining an optic axis;
- and an illumination assembly adapted to be mounted on the distal face of said scanner device, including a lens barrel member having an optic axis aligned with the optic axis of said scanning device, and at least one light pipe having a flat proximal face to receive illumination from said light-generating means and an angulated distal face for projecting said illumination at a low angle relative to the surface of the article when said surface is disposed substantially at a right angle to said optic axis, such that when a distal end of said illumination assembly is positioned in contact with said article, the illumination impinges on said symbol with an axis thereof at a low angle in a range of about 10 to 18 degrees relative to the surface of said article with said optic axis thereof substantially normal to the surface of said article.
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Abstract
An optical symbol scanner assembly includes an illumination assembly to facilitate detection and decoding small 2-D matrix bar code symbols or other optically read symbols that are laser etched or printed on the surface of microelectronics modules or other small articles. A hand-held scanner has an array of LEDs or laser diodes on its distal face that produces light to illuminate the symbol. There is also a focussing lens on the distal face and an imager device positioned behind the lens. The illumination assembly is mounted on the distal face of the scanner device. In this assembly, a lens barrel member has an optic axis aligned with the optic axis of the scanner, and a light pipe is positioned adjacent the lens barrel member. The light pipe has a flat proximal face against the array of LEDs, and an angulated distal face for projecting the illumination at a sharp angle relative to the optic axis. The tip of the illumination assembly is in near contact with the article to read the symbol. The lens barrel member may carry an auxiliary lens. Preferably, there is a pair of light pipes disposed on opposite sides of said lens barrel member. Alternatively, the scanner may be configured as a fixed device, for reading symbols on articles that flow past it without contact.
92 Citations
17 Claims
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1. An optical symbol scanner assembly for detecting and decoding a symbol lying on a surface of an article, comprising
a scanner device having a distal face on which is positioned a light-generating means for producing illumination to fall on said symbol, and focusing means for focusing an image of said symbol on an imager device positioned proximally thereof in said scanner device, said focusing means defining an optic axis; - and
an illumination assembly adapted to be mounted on the distal face of said scanner device, including a lens barrel member having an optic axis aligned with the optic axis of said scanning device, and at least one light pipe having a flat proximal face to receive illumination from said light-generating means and an angulated distal face for projecting said illumination at a low angle relative to the surface of the article when said surface is disposed substantially at a right angle to said optic axis, such that when a distal end of said illumination assembly is positioned in contact with said article, the illumination impinges on said symbol with an axis thereof at a low angle in a range of about 10 to 18 degrees relative to the surface of said article with said optic axis thereof substantially normal to the surface of said article. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical symbol scanner assembly for detecting and decoding a symbol lying on a surface of an article, comprising
a scanner device having a distal face on which is positioned a light-generating means for producing illumination to fall on said symbol, and focusing means for focusing an image of said symbol on an imager device positioned proximally thereof in said scanner device, said focusing means defining an optic axis; - and
an illumination assembly adapted to be mounted on the distal face of said scanner device, including a lens barrel member having an optic axis aligned with the optic axis of said scanning device, and at least one light pipe having a flat proximal face to receive illumination from said light-generating means and an angulated distal face for projecting said illumination at a low angle relative to the surface of said article when disposed substantially at a right angle to said optic axis, such that when a distal end of said illumination assembly is positioned in contact with said article, the illumination impinges on said symbol with an axis thereof at said low angle, wherein each said light pipe is in the form of a transparent solid member having a flat proximal side disposed against said distal face of said scanner device, an inward side rising from said proximal side and facing toward the optic axis, and an outward side having a distal portion that forms an apex angle with respect to said inner side, and wherein the apex angle at said distal portion of said outward side of said transparent solid member is substantially 40 degrees, so that said illumination reflected from said distal portion exits said inward side at said low angle.
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10. An optical symbol scanner assembly for detecting and decoding a two-dimensional optical symbol lying on a surface of an article, comprising
a housing; -
a scanner device within said housing including an imager device and focusing means for focusing an image of said optical symbol on said imager device, said focusing means defining a scanner optic axis; and
an illumination arrangement mounted in said housing at one or more sides of said optic axis and having an illumination direction that is angulated to project light therefrom at a low angle relative to the surface of said article when disposed at a right angle to said optic axis, such that when said article is at a predetermined position on said optic axis, the light of said illumination impinges on said optical symbol with a principal axis thereof at a low angle of between about 10 and 18 degrees relative to the surface of said article with said scanner optic axis substantially normal to the surface of said article. - View Dependent Claims (11, 12, 13)
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14. An optical symbol scanner assembly for detecting and decoding a symbol lying on a surface of an article, comprising
a scanner device having a distal face on which is positioned a light-generating means for producing illumination to fall on said symbol, and focusing means for focusing an image of said symbol on an imager device positioned proximally thereof in said scanner device, said focusing means defining an optic axis; - and
an illumination assembly adapted to be mounted as an attachment externally onto the distal face of said scanner device, including a lens barrel member having an optic axis aligned with the optic axis of said scanning device, and at least one light pipe having a flat proximal face to receive illumination from said light-generating means and an angulated distal face for projecting said illumination at a low angle relative to the surface of said article when disposed at a right angle to said optic axis, with a distal end of the illumination assembly projecting in front of said scanning device such that said distal end can be positioned in contact with said article, and said angulated distal face of said at least one light pipe being at an angle such that the illumination reflected therefrom exits said light pipe and impinges on said symbol at said low angle relative to the surface of said article. - View Dependent Claims (15, 16, 17)
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Specification
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Litigation Data
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Current AssigneeOmron Corporation
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Original AssigneeIndustrial Data Entry Automation Systems, Inc.
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InventorsHattersley, John R., Blackwell, Francis O. III
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Primary Examiner(s)Lee, Michael G.
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Assistant Examiner(s)Lee, Diane I.
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Application NumberUS09/366,414Publication NumberTime in Patent Office944 DaysField of Search235/462.06, 235/472.01, 235/459, 235/480, 235/454US Class Current235/472.01CPC Class CodesG06K 7/10732 Light sourcesG06K 7/1417 2D bar codes
