Optical information reading apparatus
First Claim
1. Apparatus for reading optically readable information, which reflects light comprising:
- a casing having an opening for facing optical information;
optical means, disposed in said casing, for imaging at a predetermined reading position in said casing an image of optically readable information facing said opening by light reflected therefrom;
reading sensor means, disposed at said predetermined reading position and having a light receiving plane, for converting said image into an electrical signal; and
light emitting means, positioned in said casing and substantially the same plane as said light receiving plane of said reading sensor means, for emitting light through at least part of said optical means to allow determination of focus of an image of said emitted light near optically readable information facing said opening.
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Accused Products
Abstract
A handheld reader for reading optical information such as a bar code contains a reading sensor. An image of the optical information is imaged by light reflected from the optical information, via a reflecting mirror, a lens and a diaphram member, onto the reading sensor so that the image is converted into an electric signal. A pair of LEDs are disposed on both sides of the image sensor so that the images thereof are imaged near the optical information by light from the LEDs through the diaphram member, the lens and the reflecting mirror. The LEDs and reading sensor are controlled so that the LEDs are disabled from emitting light while the reading sensor performs the reading operation of the optical information. Instead of LEDs, optical fibers can be used.
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Citations
14 Claims
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1. Apparatus for reading optically readable information, which reflects light comprising:
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a casing having an opening for facing optical information; optical means, disposed in said casing, for imaging at a predetermined reading position in said casing an image of optically readable information facing said opening by light reflected therefrom; reading sensor means, disposed at said predetermined reading position and having a light receiving plane, for converting said image into an electrical signal; and light emitting means, positioned in said casing and substantially the same plane as said light receiving plane of said reading sensor means, for emitting light through at least part of said optical means to allow determination of focus of an image of said emitted light near optically readable information facing said opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for reading optically readable information, which reflects light comprising:
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a casing having an opening for facing optical information; optical means, disposed in said casing, for imaging at a predetermined reading position in said casing an image of optically readable information facing said opening by light reflected therefrom; reading sensor means, disposed at said predetermined reading position and having a light receiving plane, for converting said image into an electrical signal; and light emitting means, positioned in said casing on opposite ends of a scanning line of said reading sensor means and on substantially the same plane as said light receiving plane for positioning said image within the said scanning line and for emitting light through at least part of said optical means to allow determination of focus of an image of said emitted light at opposite ends of optically readable information facing said opening.
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Specification