公开(公告)号：US4739459A

公开(公告)日：1988-04-19

申请号：US27423

申请日：1987-03-18

Applicant: Yuji Kobayashi ,  Norio Takahashi

Inventor： Yuji Kobayashi ,  Norio Takahashi

IPC: G01N21/59 ,  H01J40/14

CPC classification number: G01N21/5907 ,  G01N2021/5942 ,  G01N21/4738 ,  G01N2201/124

Abstract: This invention relates to an automatic range control method for a compact and portable optical density/dot percentage measuring device which can use a conventional light table as its light source, and which can digitally display a result of measurement. In the method, information obtained from an A/D converter, which converts a measured analog signal to a digital signal, is positively employed for reducing overall measuring time. An A/D conversion is first made at x1 range by a 10 bit A/D converter. The A/D conversion value is compared with predetermined values to determine a gain to be selected and perform further A/D conversion.

Abstract translation: 本发明涉及一种小型便携式光密度/点百分比测量装置的自动范围控制方法，其可以使用传统的光台作为其光源，并且可以数字地显示测量结果。 在该方法中，积极地采用从A / D转换器获得的将测量的模拟信号转换为数字信号的信息，以减少总体测量时间。 A / D转换首先通过10位A / D转换器在x1范围内进行。 将A / D转换值与预定值进行比较以确定要选择的增益并执行进一步的A / D转换。

公开(公告)号：US4652735A

公开(公告)日：1987-03-24

申请号：US605408

申请日：1984-04-30

Applicant: Ken Ishikawa ,  Mitsuru Ikeda ,  Shigeru Watanabe

Inventor： Ken Ishikawa ,  Mitsuru Ikeda ,  Shigeru Watanabe

IPC: G01J1/42 ,  G01T1/29 ,  G06K7/10 ,  H04N1/40 ,  H01J40/14

CPC classification number: G06K7/10841 ,  G01J1/42 ,  G01T1/2014 ,  G01T1/2921 ,  G01T1/2964 ,  H04N1/40056 ,  G01N2201/124

Abstract: An image reader having a high sensitive detection system for detecting a variation in a first light quantity to generate a first output, a low sensitive detection system for detecting a variation in a second light quantity to generate a second output where the second light quantity is greater than the said first light quantity, and a signal composing circuit for receiving the outputs of the high and low sensitive detection systems, each of the detection systems being so disposed as to detect simultaneously or substantially simultaneously a ray bundle from a picture element of a picture, and the output of the signal composing circuit being (a) the output of the high sensitive detection system when the received light quantity is smaller than a threshold light quantity which can be detected with substantially the same degree of accuracy by both the detection systems or (b) the sum of (i) the output of the low sensitive detection system and (ii) the difference between the outputs of the detection systems at the threshold light quantity whereby a time-serial output of wide dynamic range is obtained.

Abstract translation: 一种具有用于检测第一光量的变化以产生第一输出的高灵敏度检测系统的图像读取器，用于检测第二光量的变化以产生第二光量较大的第二输出的低灵敏度检测系统 以及用于接收高灵敏度检测系统和低敏感检测系统的输出的信号组合电路，每个检测系统被布置成同时或基本上同时从图像的图像元素检测光束 ，并且信号合成电路的输出是（a）当接收光量小于可以通过两个检测系统以基本相同的精度检测的阈值光量时，高灵敏度检测系统的输出，或 （b）（i）低敏感检测系统的输出的总和和（ii） 在阈值光量处的切割系统，从而获得宽动态范围的时间串行输出。