Abstract: A reflection type sensor includes a light emitting element emitting light to an object and including a plurality of LED chips disposed to be adjacent to each other and integrated into a package, and the LED chips emit light beams belonging to different wave bands. A light detecting element detects the light reflected on the object, and performs a photoelectric conversion for the light beams belonging to the different wave bands, thereby delivering a light signal. A light detecting circuit determines the presence or absence of the object on the basis of the light signal delivered from the light detecting element.

Abstract: A disk-shaped object detecting system detecting the presence or absence and position of a disk-shaped object such as semiconductor wafers or magnetic disks includes a light emitting element emitting light toward a circumferential edge of the object while being moved across the object, a light receiving element receiving the light reflected on the circumferential edge of the object while being moved across the object together with the light emitting element, delivering first and second light signals each according to the received light, the first and second light signals having a ratio depending upon at what position between opposite ends the light receiving element receives the light reflected on the circumferential edge of the object, the first and second signals having a magnitude relation which is reversed when the light reflected on the circumferential edge of the object has been moved from one end side to the other end side of the light receiving element, an AND processing section supplied with the first

Abstract: A photoelectric switch includes a light emitting section emitting pulse light so that intensity of the emitted pulse light is sequentially increased. A light detecting section detects the pulse light emitted by the light emitting section. A light detection signal indicative of the received light is amplified and then integrated. A high-level light detection signal is delivered by the light detecting section when an integral value is equal to or above a threshold. A determination circuit delivers a first detection signal when a duration of the light detection signal is equal or above a predetermined values. The determination circuit further delivers a stable operation signal when a set time period is reached. The light detecting section is integrated into one-chip configuration.

Abstract: A serial data transmission device has a master unit, plural terminal units, and an abnormal detection unit connected by a signal line. Each terminal unit has an allocated address. The master unit interchanges data with each one of the plural terminal units in sequence. Each interchange of data with one terminal unit constitutes a cycle. Each terminal unit counts the number of data cycles of the master unit. When a terminal unit detects its assigned cycle number in the total sequence of cycles, a confirmation signal is output to the signal line. The abnormal detection unit determines the presence and location of an abnormality in accordance with the absence of a confirmation signal from a particular terminal.

Abstract: An optical type detector comprises a full-wave rectifier circuit to which input power source voltage arbitrarily selected is supplied, a switching regulator, a detecting section supplied with power from the switching regulator and optically detecting an object to output a detection signal, and a relay switch for performing switching operation in response to detection signal and producing a detection output corresponding to detection signal. The switching regulator includes a drive section which has two transistors connected in series with each other. When the input power voltage is applied, the two transistors divide the power voltage into substantially equal two parts.

Abstract: An egg inspecting apparatus utilizes the light reception signals of 575 m.mu., 590 m.mu., and 620 m.mu. obtained from the light beams passed through an egg to be inspected, in such a manner the light reception signal of 575 m.mu. is calibrated by basing on the light reception signal 590 m.mu. and is compared with a blood-containing egg level to select blood-containing eggs, and the light reception signal of 620 m.mu. is compared with an addled egg level to select addled eggs.