Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Reexamination Certificate
2007-10-23
2007-10-23
Pham, Hai (Department: 2861)
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
C347S258000, C359S739000
Reexamination Certificate
active
11229614
ABSTRACT:
A blue laser light source is a semiconductor laser having a sapphire substrate that is transparent to a wavelength of a blue laser beam emitted from an active layer. A condenser lens converges the blue laser beam at a focal point where a modulator is placed. A slit plate limits the light flux on the exit side of the condenser lens. A slit of the slit plate is located at a depth position (Z) on an optical axis of the condenser lens, and the depth position satisfies the following conditions: Z≧Z0(Z0<0) and Pp(Z0)=P1,wherein Z is assumed to have a positive value on a forward side of the blue laser beam from the focal point, Pp(Z) is a value obtained by dividing a width of the blue laser beam in the parallel direction to the active surface at the depth position Z by a width of the extraneous light in the parallel direction at said depth position, and P1is a convergent value of Pp(Z) at the infinity (Z→∞).
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patent: 6977780 (2005-12-01), Matsumoto et al.
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Morimoto Yoshinori
Saito Ken-ichi
Tanabe Tsuyoshi
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