Claims
- 1. An optical scanner for reading indicia by effecting a scanning motion of a light beam in an x-axis direction across an indicia to be read, said scanner comprising:(a) a laser for producing an unmodified light beam of non-circularly-symmetric cross-section, having an x-axis and a y-axis, beam divergence in the x axis being greater than beam divergence in the y axis; (b) negative beam-shaping optics in the outgoing beam path for adjusting the y axis divergence independently of the x axis divergence.
- 2. An optical scanner according to claim 1 wherein the beam-shaping optics comprises a concave part-cylindrical mirror.
- 3. An optical scanner according to claim 2 wherein said mirror defines the mirror axis, said mirror axis lying in the x axis direction.
- 4. An optical scanner according to claim 1 further comprising beam-shaping optics in the beam for equally adjusting the x and y axis divergence.
- 5. An optical scanner according to claim 1 wherein the laser is a gain guided.
- 6. An optical scanner according to claim 1 wherein the laser is an index guided laser.
- 7. An optical scanner according to claim 1 wherein the beam has an x-waist, at which its x axis dimension is least, and a y-waist, at which its y axis dimension is least, said x waist being located further from the scanner than the y waist.
- 8. An optical scanner according to claim 7 wherein the negative beam-shaping optics adjusts the spacing between the x and y waist without change in overall magnification.
- 9. An optical scanner for reading indicia by effecting a scanning motion of a light beam in an x-axis direction across an indicia to be read, said scanner comprising:(a) a laser for producing a light beam of non-circularly-symmetric cross-section, having an x-axis and a y-axis, beam divergence in the x axis being greater than beam divergence in the y axis, and wherein the beam has an x-waist, at which its x axis dimension is least, and a y-waist, at which its y axis dimension is least, said x waist being located further from the scanner than the y waist; (b) negative beam-shaping optics in the beam path for adjusting the y axis divergence independently of the x axis divergence without change in overall magnification.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a divisional application of and claims priority to U.S. application Ser. No. 09/047,011, filed on Mar. 24, 1998, now U.S. Pat. No. 6,382,513, which is a continuation-in-part application of U.S. application Ser. No. 08/912,147, filed on Aug. 15, 1997, now issued U.S. Pat. No. 5,859,417, which is a continuation application of U.S. application Ser. No. 08/405,585, filed on Mar. 17, 1995, now abandoned, which is a continuation-in-part application of U.S. application Ser. No. 08/268,982, filed on Jun. 30, 1994, now issued U.S. Pat. No. 5,742,038, which is a continuation-in-part application of U.S. application Ser. No. 08/314,519, filed on Sep. 28, 1994, now issued U.S. Pat. No. 5,506,392, which is a divisional application of U.S. application Ser. No. 08/109,021, filed on Aug. 19, 1993, now issued U.S. Pat. No. 5,352,922, which is a divisional application of U.S. application Ser. No. 07/735,573, filed on Jul. 25, 1991, now issued U.S. Pat. No. 5,278,397.
US Referenced Citations (76)
Foreign Referenced Citations (14)
Number |
Date |
Country |
3602008 |
Jul 1987 |
DE |
0 249 713 |
Dec 1987 |
EP |
0 385 478 |
Sep 1990 |
EP |
0 492 065 |
Jan 1992 |
EP |
0 589 361 |
Mar 1994 |
EP |
55-88172 |
Jul 1980 |
JP |
60-195639 |
Mar 1984 |
JP |
61-120283 |
Jun 1986 |
JP |
1-93871 |
Apr 1989 |
JP |
3-127191 |
May 1991 |
JP |
0198175 |
Aug 1991 |
JP |
6-150039 |
May 1994 |
JP |
WO 9318478 |
Sep 1993 |
WO |
WO 9401835 |
Jan 1994 |
WO |
Non-Patent Literature Citations (4)
Entry |
“Quick Check 500” Brochure, Photographic Sciences, 2 pages, 1989. |
Barkan, Automatic I.D. News, “Author Verifies the Key to Bar Codying Success”, (Nov. 1988). |
Grabowski, et al., “Code Reading Mechanical Scanning Gun”, IBM Technical Bulletin, vol. 5, No. 5 Oct. 1962. |
Yamazaki et al, “New Holographic Technology for a Compact POS Scanner,” Applied Optics, vol. 29, No. 11 (Apr. 1990). |
Continuations (1)
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Parent |
08/405585 |
Mar 1995 |
US |
Child |
08/912147 |
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US |
Continuation in Parts (3)
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Number |
Date |
Country |
Parent |
08/912147 |
Aug 1997 |
US |
Child |
09/047011 |
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US |
Parent |
08/268982 |
Jun 1994 |
US |
Child |
08/405585 |
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US |
Parent |
08/314519 |
Sep 1994 |
US |
Child |
08/268982 |
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US |