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2. 发明授权

US5486914A LCD bargraph motion picture light meter 失效
标题翻译：液晶条形图电影灯
公开(公告)号：US5486914A
公开(公告)日：1996-01-23
申请号：US266102
申请日：1994-06-27
申请人： Thomas F. Denove , William L. Blowers
发明人： Thomas F. Denove , William L. Blowers
IPC分类号： G01J1/42
CPC分类号： G01J1/4204 , G01J1/4214
摘要： In a handheld incident light meter instrument, a custom LCD panel provides both a digital readout and a bar graph array which simulates an analog meter but uses no moving mechanical parts and which may be operated in a choice of modes: bar, floating zone or dedicated. Unusual accuracy and stability over a wide dynamic range, from 0.1 to over 50,000 footcandles, are achieved in a novel analog photo-amplifier portion having a linear autoranging preamplifier, an averaging integrator and a temperature-compensated log converter, driving an IC analog-to-digital converter connected to a microprocessor programmed to operate in a choice of modes to operate the LCD via a driver to display light readings according to commands entered via a set of ergonomic user controls. Battery condition is displayed continuously. The digital readout may be backlit for low ambient light level. Two versions each provide special operating modes in addition to a regular illuminance mode in which incident light readings are displayed in a choice of footcandles or lux with up to 5 sequential readings storable on display. A first version, the "Cinemeter II", directed particularly to cinematography, accepts user-entered data such as film speed, shutter speed, shutter angle and lens filters, and displays movie camera f-stop settings automatically calculated from the light reading. A second version, the "Lighting Director", for evaluating illuminance in various environments including movie-making, stage lighting, general photography and architectural illumination, etc., can display light readings as +/- deviation from a preset target value, with optional audible indication.
摘要翻译：在手持入射式光度计仪器中，定制LCD面板提供数字读数和条形图阵列，其模拟模拟仪表，但不使用移动的机械部件，并且可以以选择模式操作：条形，浮动区域或专用。在具有线性自动量程前置放大器，平均积分器和温度补偿对数转换器的新颖的模拟光电放大器部分中，在宽范围动态范围（0.1至超过50,000英尺烛光）上实现了不寻常的精度和稳定性，驱动IC模拟到连接到微处理器的数字转换器被编程为在选择的模式下操作以经由驱动器操作LCD，以根据通过一组符合人体工程学的用户控制输入的命令来显示光读数。电池状况不断显示。对于低环境光级，数字读数可能是背光的。除了常规照度模式之外，两种版本都提供特殊的操作模式，其中入射光读数显示在可选择的脚注或勒克斯，最多可显示5个可读取的连续读数。第一个版本，特别针对摄影的“电影II”，接受用户输入的数据，如胶片速度，快门速度，快门角度和镜头滤镜，并显示从光读数自动计算的电影摄影机f停止设置。第二个版本，“照明总监”，用于评估各种环境（包括电影制作，舞台照明，一般摄影和建筑照明等）的照度，可以将光读数显示为与预设目标值的+/-偏差，并可选听觉指示

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