United States Patent [19] [11] Patent Number: 4,991,917
Yang [45] Date of Patent: Feb. 12, 1991
[54] HOLOGRAPHIC SCANNING SYSTEM FOR LASER PRINTER
[75] Inventor: Keung Y. Yang, Seoul, Rep. of Korea
[73] Assignee: Goldstar Co., Ltd., Seoul, Rep. of Korea
[21] Appl. No.: 413,201
[22] Filed: Sep. 27,1989
[30] Foreign Application Priority Data
Sep. 30, 1988 [KR] Rep. of Korea 12857/1988
[51] Int. CI.' G02B 5/32; G02B 26/10
[52] U.S. CI 350/3.71; 350/3.72;
350/6.2
[58] Field of Search 350/3.7, 3.71, 3.72,
350/3.65, 3.73, 6.7, 6.8, 6.2, 6.3
[56] References Cited
U.S. PATENT DOCUMENTS
4,076,372 2/1978 Pole et al 350/3.71
4,113,343 9/1978 Pole et al 350/3.71
FOREIGN PATENT DOCUMENTS
55- 73015 6/1980 Japan 350/3.71
56- 17318 2/1981 Japan 350/3.71
56-24313 3/1981 Japan 350/3.71
63-18321 1/1988 Japan 350/3.71
Primary Examiner—Bruce Y. Arnold
Assistant Examiner—Martin Lerner
Attorney, Agent, or Firm—Birch, Stewart, Kolasch &
Birch
[57] ABSTRACT
A laser scanning system for a laser printer comprises a hologram scanner for scanning and focusing a laser beam and a convex lens for compensating the focusing locus of the laser beam into a straight line and for making the scanning speed uniform, whereby the whole construction of the system is simple in construction and the cost becomes low.
6 Claims, 3 Drawing Sheets
