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    • 2. 发明授权
    • Shutter mechanism drive having reduced mechanical noise
    • 快门机构驱动器具有降低的机械噪声
    • US4972217A
    • 1990-11-20
    • US428055
    • 1989-10-27
    • John P. Gaewsky
    • John P. Gaewsky
    • G03B7/097G03B9/42
    • G03B7/097G03B9/42
    • A shutter mechanism actuated by a plunger type solenoid in an exposure control system for a reflex camera is provided with a solenoid drive control for reducing the subject-distracting mechanical noise that is normally generated when the solenoid plunger is driven into its fully retracted position in order to close shutter blades forming a portion of the shutter mechanism, immediately prior to an exposure interval. The solenoid drive control comprises a microcontroller and a blade encoder to indicate the degree of blade closure. Blade closure signals are routed to the microcontroller that, in response thereto, causes a reduction in the amount of solenoid actuating current delivered to the solenoid to thereby reduce the amount of solenoid drive and therefore the amount of mechanical noise that is generated when the solenoid plunger is driven into the fully retracted position.
    • 在用于反射照相机的曝光控制系统中由柱塞型螺线管致动的快门机构设置有电磁驱动控制器,用于减小当螺线管柱塞按顺序驱动到其完全缩回位置时通常产生的主体分心机械噪声 以在紧接着曝光间隔之前关闭形成快门机构的一部分的快门叶片。 螺线管驱动控制器包括微控制器和刀片编码器,以指示叶片关闭的程度。 叶片关闭信号被路由到微控制器,响应于此,导致输送到螺线管的螺线管致动电流的量减少,从而减少螺线管驱动的数量,并因此减少当螺线管柱塞 被驱动到完全缩回位置。
    • 7. 发明授权
    • Variable color-output strobe for photographic apparatus
    • 可变色彩输出闪光灯用于摄影器材
    • US5109248A
    • 1992-04-28
    • US586512
    • 1990-09-21
    • Stephanie PetrakosJohn P. Gaewsky
    • Stephanie PetrakosJohn P. Gaewsky
    • H01J61/95H05B41/32
    • H05B41/325H01J61/95
    • A single flash discharge tube system is provided that is capable of emitting artificial light of a controlled and variable spectral output to compensate for photographic film color variations and/or extremes in scene color temperature. The flash tube contains a mixture of two or more gasses with each gas in the tube having a different ionization potential. When ionized, each gas or combination thereof produces light having a different spectral output. The ionization of each gas is controlled by a trigger voltage applied to the flash tube in accordance with a code on a film container indicative of the color balance of film contained therein and/or sensing apparatus that determines scene color temperature.
    • 提供单个闪光放电管系统,其能够发射受控和可变光谱输出的人造光以补偿场景色温中的照相胶片颜色变化和/或极限。 闪蒸管含有两种或多种气体的混合物,管中的每种气体具有不同的电离电位。 当电离时,每种气体或其组合产生具有不同光谱输出的光。 每个气体的离子化是通过施加到闪光管的触发电压来控制的,该触发电压根据胶卷容器上的代码指示其中所含的胶片的颜色平衡和/或确定场景色温的感测装置。
    • 8. 发明授权
    • Preflash measurement technique
    • 预闪测量技术
    • US4998128A
    • 1991-03-05
    • US414267
    • 1989-09-29
    • Judith N. ColtmanJohn P. GaewskyJeffrey T. Gray
    • Judith N. ColtmanJohn P. GaewskyJeffrey T. Gray
    • G03B7/16
    • G03B7/16
    • An automatic exposure system for an electronic flash camera incorporates an arrangement for measuring the reflectivity of a scene illuminated by the electronic flash prior to exposure in order to determine certain photographic scene characteristics for use in controlling a subsequent photographic exposure, an arrangement that substantially reduces the complexity and energy consumption of the electronic flash system while improving the ability of the exposure control system to accurately determine these characteristics. The arrangement includes the pre-exposure firing of the electronic flash to illuminate a scene with a pulse of light for a short, fixed period of time. A reflection of this light pulse is integrated for a portion of this fixed period of time. The final integrated value of the reflected light is a measure of subject reflectivity. This integrated value is then employed to derive the desired photographic scene characteristics.
    • 用于电子闪光照相机的自动曝光系统包括用于测量在曝光之前由电子闪光灯照亮的场景的反射率的装置,以便确定用于控制随后的照相曝光的某些摄影场景特性,基本上减少 电子闪光灯系统的复杂性和能量消耗,同时提高了曝光控制系统准确地确定这些特性的能力。 该装置包括电子闪光灯的预曝光点火,以短时间固定的时间段以光脉冲照亮场景。 该光脉冲的反射在该固定时间段的一部分被积分。 反射光的最终积分值是对象反射率的度量。 然后使用该积分值来导出所需的摄影场景特征。