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1. 发明授权

US4636068A Change-over shutter for light-wave range finder 失效
标题翻译：用于光波测距仪的切换快门
公开(公告)号：US4636068A
公开(公告)日：1987-01-13
申请号：US486169
申请日：1983-04-18
申请人： Masaaki Niiho , Kiyoshi Itoh , Shinichi Suzuki , Takuo Itagaki , Koji Tsuda
发明人： Masaaki Niiho , Kiyoshi Itoh , Shinichi Suzuki , Takuo Itagaki , Koji Tsuda
IPC分类号： G01S7/48 , G01S7/481 , G01S17/08 , G02B5/00 , G01C3/08 , G02B5/22
CPC分类号： G01S7/4811
摘要： A change-over shutter for an optical range finder employs at least two slits for measurement light, one of which is employed during long distance measurements and the other of which includes a light reduction member and is employed for short distance measurements. The arrangement advantageously eliminates measurement error caused in short distance measurements due to light secondarily reflected from the light emitting element.
摘要翻译：用于光学测距仪的转换快门使用至少两个用于测量光的狭缝，其中一个用于长距离测量，另一个狭缝包括减光构件并用于短距离测量。该装置有利地消除了由于从发光元件二次反射的光而在短距离测量中引起的测量误差。

2. 发明授权

US4523108A Averaging circuit 失效
标题翻译：平均电路
公开(公告)号：US4523108A
公开(公告)日：1985-06-11
申请号：US400532
申请日：1982-07-21
申请人： Masaaki Niiho , Takuo Itagaki
发明人： Masaaki Niiho , Takuo Itagaki
IPC分类号： G01C3/06 , G01C3/00 , G01S7/48 , G01S7/486 , G01S7/487 , G01S17/36 , G06G7/12 , H03K5/01 , G01C3/08 , H03K5/153
CPC分类号： G01S17/36 , G01S7/4868 , G01S7/487
摘要： An averaging circuit includes a number of sample/hold circuits which cyclically sample/hold an input signal, the outputs of the sample hold circuits being added and applied to a comparator. A further sample/hold circuit sample/holds an internal input signal at an increased rate and the output thereof is amplified by a factor equal to the number of cyclically operated sample/hold circuits before being applied as the other input to the comparator.
摘要翻译：平均电路包括循环地采样/保持输入信号的多个采样/保持电路，并将采样保持电路的输出相加并施加到比较器。进一步的采样/保持电路以增加的速率采样/保持内部输入信号，并且其输出在施加到比较器的另一个输入之前被放大了等于循环操作的采样/保持电路的数量的因子。

3. 发明授权

US4083055A Exposure information quantizing circuit utilizing shift register 失效
标题翻译：曝光信息量化电路使用移位寄存器
公开(公告)号：US4083055A
公开(公告)日：1978-04-04
申请号：US667533
申请日：1976-03-17
申请人： Yukiyasu Nishikawa , Takuo Itagaki
发明人： Yukiyasu Nishikawa , Takuo Itagaki
IPC分类号： G03B7/091 , G01J1/44 , G03B17/18 , G03B7/08
CPC分类号： G03B17/18
摘要： An exposure information quantizing circuit. A current signal source generates a signal current to be quantized. A controllable bidirectional shift register has a series of bit positions and corresponding signal receiving outputs and is operable to shift a bit sequentially from one position to the next. Each position corresponds to a different divisional range of the signal to be quantized. A unique signal appears only at the output corresponding to the position containing a bit. Means comprises at least one further reference current source responsive to the outputs of the shift register for forming at least a pair of signals corresponding to opposite ends of the divisional range for each output of the shift register. A first logarithmic compression means is coupled to the signal current source for forming a first reference voltage proportional to the logarithm of the signal current. At least one further logarithmic compression means is coupled to the at least one further reference current source for causing the pair of signals to form first and second reference signals proportional to the logarithm of the at least one further reference current source. A voltage comparator forms a direction of shift control signal for the shift register in accordance with comparison thereby of the magnitude of the signal voltage with that of the first and second reference voltages. A source of shift control pulses is provided for the shift register.

4. 发明授权

US4080610A Exposure-time control system having a closed-loop circuit arrangement for providing a timing control signal 失效
标题翻译：曝光时间控制系统具有用于提供定时控制信号的闭环电路装置
公开(公告)号：US4080610A
公开(公告)日：1978-03-21
申请号：US683846
申请日：1976-05-06
申请人： Yukiyasu Nishikawa , Takuo Itagaki
发明人： Yukiyasu Nishikawa , Takuo Itagaki
IPC分类号： G03B7/093 , G03B7/083 , G03B17/18 , G03B7/08
CPC分类号： G03B7/083 , G03B17/18
摘要： A closed-loop circuit arrangement sequentially operates in a tracking mode before the shutter of a single lens reflex camera is actuated, and then in a holding mode after the shutter is actuated. The circuit arrangement receives from a conventional photoelectric circuit a first analog signal that instantaneously represents exposure time so long as light entering the camera impinges on the photoelectric circuit. A register in the circuit arrangement provides a digital multi-bit signal that is converted to a second analog signal. The first and second analog signals are compared to produce an error signal used during the tracking mode in controlling the register so that the digital multi-bit signal varies until the first and second analog signals represent the same exposure time. After the shutter is actuated, the register serves as a memory thereby causing the second analog signal to statically represent exposure time.
摘要翻译：在单镜头反光相机的快门被致动之前，然后在快门被致动之后处于保持模式下，闭环电路装置依次以跟踪模式操作。只要入射到相机的光照射在光电路上，电路装置从传统的光电路接收瞬时表示曝光时间的第一模拟信号。电路装置中的寄存器提供转换成第二模拟信号的数字多位信号。对第一和第二模拟信号进行比较，以产生在跟踪模式期间用于控制寄存器的误差信号，使得数字多位信号变化，直到第一和第二模拟信号表示相同的曝光时间。在快门被激活之后，寄存器用作存储器，从而使得第二模拟信号静态地表示曝光时间。

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