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    • 22. 发明授权
    • Driving method for tunable semiconductor laser diode, tunable light
source device and driving method for the same
    • 可调谐半导体激光二极管的驱动方法,可调谐光源器件及其驱动方法
    • US5889801A
    • 1999-03-30
    • US919308
    • 1997-08-28
    • Tomoaki KatoYoshiaki Yamada
    • Tomoaki KatoYoshiaki Yamada
    • H01S5/06H01S5/042H01S5/0625H01S3/10H01S3/00H01S3/19
    • H01S5/06256H01S5/042H01S5/06255
    • A driving method for a tunable semiconductor laser which is remarkably effective for realizing high speed and stable wavelength switching is presented. Generally, when a single longitudinal mode laser oscillation wavelength of a tunable semiconductor laser diode comprising an active region and a wavelength control region is switched from .lambda..sub.1 to .lambda..sub.2, a wavelength control current (.lambda.-Control) supplied to the wavelength control region is switched from I.sub.1 to I.sub.2. In the driving method according to the present invention, an active layer current (Active) supplied to the active region is temporarily decreased below a predetermined value during a predetermined period, in order to temporarily stop the single longitudinal mode laser oscillation of the laser diode. Preferably, the length of the predetermined period is set longer both before and after the moment of the wavelength control current switching than at least the carrier lifetime in the wavelength control region, and the predetermined value of the active layer current is set below threshold currents of all longitudinal modes existing between longitudinal modes corresponding to oscillation wavelengths before and after the wavelength control current switching. According to the driving method, oscillations at undesirable longitudinal modes are prevented, and thus stable high speed wavelength switchings precisely following supplied wavelength control signals are made possible even in a laser such as a tunable DBR laser diode involving longitudinal mode hops.
    • 提出了一种对于实现高速和稳定的波长切换非常有效的可调谐半导体激光器的驱动方法。 通常,当将包括有源区和波长控制区的可调谐半导体激光二极管的单一纵模激光振荡波长从λ1切换到λ2时,提供给波长控制区的波长控制电流(λ-Control)为 从I1切换到I2。 在根据本发明的驱动方法中,为了暂时停止激光二极管的单个纵模激光振荡,在预定时间段期间,提供给有源区的有源层电流(有源)暂时降低到预定值以下。 优选地,在波长控制电流切换的时刻之前和之后,将预定周期的长度设置得比至少波长控制区域中的载波寿命长,并且将有源层电流的预定值设置为低于阈值电流 在纵向模式之间存在的所有纵向模式对应于在波长控制电流切换之前和之后的振荡波长。 根据驱动方法,防止了不期望的纵向模式的振荡,因此即使在诸如涉及纵向跳跃的可调谐DBR激光二极管的激光器中,也可以精确地提供稳定的高速波长切换,所以可以实现提供的波长控制信号。
    • 28. 发明授权
    • Ejecting method and ejecting apparatus
    • 喷射方法和喷射装置
    • US07455389B2
    • 2008-11-25
    • US11239390
    • 2005-09-30
    • Shinichi NakamuraYoshiaki Yamada
    • Shinichi NakamuraYoshiaki Yamada
    • B41J2/145B41J2/15
    • H05B33/10
    • In an ink jet apparatus for manufacturing a color filter 1, ink jet heads 22 having a plurality of nozzle 27 are disposed in a linear manner. Filter element member is ejected to a motherboard 12 from a plurality of nozzles 27 four times so as to form the filter element 3 in a predetermined thickness. By doing this, it is possible to prevent difference in the thickness in a plurality of the filter elements 3 and to equalize light transparency in planar manner. Thus, in an ejecting apparatus, a color filter can be formed in more common way at low cost and more efficiently. Also, it is possible to provide an ejecting apparatus which can equalize factors such as electrooptic characteristics of the electrooptic members, color displaying characteristics by the liquid crystal apparatuses, and illuminating characteristics by an EL surface.
    • 在用于制造滤色器1的喷墨装置中,具有多个喷嘴27的喷墨头22以线性方式设置。 滤芯元件从多个喷嘴27喷射到母板12四次,以形成预定厚度的过滤元件3。 通过这样做,可以防止多个滤光元件3的厚度差异,并平滑地均匀化透光性。 因此,在喷射装置中,可以以更低成本和更有效地以更常见的方式形成滤色器。 此外,可以提供一种能够使诸如电光元件的电光特性,液晶装置的显色特性和EL表面的照明特性等因素均衡的喷射装置。