Optical wand for reading OCR characters and bar code marks

• US 4,538,072 A
• Filed: 04/19/1983
• Issued: 08/27/1985
• Est. Priority Date: 04/20/1982
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Immler, Josef, van der Sel, Cornelis
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): Brophy, J. Jon
• Application Number:
  US06/486,587
• Time in Patent Office: 861 Days
• Field of Search: 235/440, 235/472, 235/462, 235/436, 382/62, 250/216, 250/239, 250/566, 250/568
• US Class Current: 250/568
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners
• CPC Class Codes: G06K 7/109 adaptations to make the hand-held scanner useable as a fixed scanner
• CPC Class Codes: G06V 10/12 Details of acquisition arrangements; Constructional details thereof

Abstract

Optical wand for automatic character recognition including a scanner unit designed to be a manually movable along a line of print of a data carrier in order to recognize optical characters and incorporating a light source for illuminating a scanning window and a sensing device. A second scanner unit includes a second sensing device and is designed for recognizing bar code marks. A gun shaped housing forms a common case for both scanner units.

Claims

1. An optical wand for automatic character recognition designed to be manually movable along a line of print of a data carrier for recognizing optical characters and bar code marks, respectively and including a scanner unit incorporating a light source for illuminating a scanning window via reflected light and the portion of the data carrier appearing therein, an optical system and a sensing unit, said optical wand comprising:

a housing body having a nose section including a scanning tip with the optical system being located within the nose section, the housing body having a handle section adapted for manually gripping and angularly extending away from the nose section and the nose section includes a tip having an

aperture serving as the scanning window for the optical system commonly utilized for scanning of both optical characters and bar code marks and means for receiving the reflected light, and means for deflecting said reflected light; and

said sensing unit being arranged in said housing and being composed of first and second sensor devices, the first sensor device being arranged in alignment with said aperture for directly receiving one portion of reflected light and the second sensor device being arranged for receiving another portion of the reflected light from said deflecting means.

2. The optical wand as recited in claim 1, wherein said deflecting means comprises a deflecting prism having an adjusting screw for changing the distance of the deflecting prism from said second sensor device.

3. The optical wand as recited in claim 2, wherein said optical system further comprises:

a tubular support member having a first and a second end portion and being replaceably mounted within said housing in alignment with said scanning tip;

said first end of portion facing the scanning tip and bearing a lens system, and the sensor devices being mounted onto said support member in proximity of the second end portion;

an inner adjusting tube coaxially and slideably arranged within said support member and bearing said deviating prism attached to its inner wall adjacent to said second end portion of said support member; and

means for moving and lacking said inner moving tube with respect to said support member.

4. The optical wand as recited in claim 3, wherein said adjusting and securing means further comprise:

a groove cut into the outer surface of the wall of the

adjusting tube in a direction perpendicular to the central axis of the adjusting tube;

an opening provided in the wall of the supporting member in alignment with said groove; and

a threaded opening provided in the wall of the supporting member and a screw arranged therein for securing the slideably arranged adjusting tube with respect to the support member in an adjusted position.

5. The optical wand as recited in claim 4, wherein the first end portion of the support member forms a guiding shoulder and the lens system comprises a separate mount fastened to said guiding shoulder;

and wherein the second end portion comprises a collar for mounting the sensor device for recognizing optical characters, an opening in the side wall arranged opposite to said deviating prism, and in alignment therewith a bearing surface provided on the outer surface of said support member for attaching a sensor array for recognizing bar code marks.