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(12) United States Patent (10) Patent No.: US 8,585,956 B1 Pagryzinski Et Al

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(12) United States Patent (10) Patent No.: US 8,585,956 B1 Pagryzinski Et Al US008585956B1 (12) United States Patent (10) Patent No.: US 8,585,956 B1 Pagryzinski et al. (45) Date of Patent: Nov. 19, 2013 (54) SYSTEMS AND METHODS FOR LASER 4,156,124 A 5, 1979 Macken et al. MARKINGWORK PIECES 4,276,829 A 7, 1981 Chen 4,336,439 A 6, 1982 Sasnett et al. (75) Inventors: WilliamO O V. Pagryzinski, Leo, IN (US); 4,390.903.4,354,196 A 10,6, 19831982 NStay tal.a Caleb A. Ziebold, Defiance, OH (US) 4,446,165 A 5/1984 Roberts 4,468,551 A 8, 1984 Neiheisel (73) Assignee: Therma-Tru, Inc., Edgerton, OH (US) (Continued) (*) Notice: Subject to any disclaimer, the term of this FOREIGN PATENT DOCUMENTS patent is extended or adjusted under 35 U.S.C. 154(b) by 119 days. DE 4300378 7, 1993 EP 213546 1, 1991 (21) Appl. No.: 12/911,336 (Continued) (22) Filed: Oct. 25, 2010 OTHER PUBLICATIONS Related U.S. Application Data The Engravers Journal, vol. 19, No. 2, Sep. 1993, 18 pgs. (60) Provisional application No. 61/254,453, filed on Oct. (Continued) 23, 2009. Primary Examiner — Larry Thrower (51) Int. Cl. (74) Attorney, Agent, or Firm — Califee, Halter & Griswold B29C 35/08 (2006.01) LLP (52) U.S. Cl. USPC .......................................................... 264/400 (57) ABSTRACT (58) Field of Classification Search A method of laser marking a workpiece involves reproducing USPC .................................... ... 264/400 a pattern having a Surface marked portion and a depth See application file for complete search history. engraved portion from a digital image of the pattern. The (56) References Cited grayscale shades of pixels in one portion of the image are adjusted while maintaining grayscale shades of pixels in the U.S. PATENT DOCUMENTS other portions of the image constant, wherein the adjusted grayscale shades of pixels corresponding to a surface marked 3,506,779 A 4, 1970 Brown et al. portion are within a first range and the adjusted grayscale 3,584, 183 A 6, 1971 Chiaretta et al. shades of pixels corresponding to a depth engraved portion 3,619,037 A 1 1/1971 Pugh, Jr. 3,626,141 A 12/1971 Daly are within a second range separate from the first range. The 3,636,251 A 1/1972 Daly et al. modified image is converted to a computer readable code, 3,745,586 A 7/1973 Brandy Such that the first and second ranges of grayscale shades are 3,920,951 A 11/1975 Chovan et al. associated with Surface marking and depth engraving ranges 4,046,986 A 9, 1977 Barker of laser power settings. A laser marking apparatus is then 4,054,094. A 10, 1977 Caddell et al. 4,126,500 A 11, 1978 Palanos operated in accordance with the computer readable code to 4,128,752 A 12/1978 Gravel laser mark the work piece. 4,139,409 A 2f1979 Macken et al. 4,143,261 A 3, 1979 Eckart 28 Claims, 15 Drawing Sheets US 8,585,956 B1 Page 2 (56) References Cited 6.424,670 B1 7/2002 Sukhman et al. 6,489,985 B1 12/2002 Brodsky et al. U.S. PATENT DOCUMENTS 6,495,237 B1 12/2002 Costin 6,528,758 B2 3/2003 Shaffer 4,480,169 A 10, 1984 Macken 6,544,634 B1 4/2003 Abrams et al. 4507,536 A 3, 1985 Inoue 6,559.410 B2 5/2003 Bowker et al. 4530370 A 5/1985 Fujii et al. 6,576,862 B1 6/2003 Costin et al. 4,535,218 A 8, 1985 Krause et al. 6,616,710 B1 9, 2003 Costin et al. 4,564,739 A 1, 1986 Mattelin 6,616,997 B1 9, 2003 Lauer et al. 4.596,409 A 6, 1986 Holbein et al. 6,649.245 B2 11/2003 Lenderink 4,629,858. 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