Sharp Kabushiki Kaisha Corporation

Hisakazu Sugiyama

Akifumi Yamaguchi

Hideo Wada

Takayuki Taminaga

Hajime Kashida

There is provided an optical velocimeter for achieving miniaturization and lower power consumption thereof and for accurately detecting two-dimensional travel velocity of a measured object. This optical velocimeter includes a light-emitting element, a diffraction grating, two light-receiving sections, and a signal processing circuit. Light emitted from the light-emitting element is branched by the diffraction grating into three light fluxes, and optical axes of the divided light fluxes are intersected one another on the measured object to form one detection point. Scattered light from the detection point frequency-shifted by travel of the measured object is then received by the two light-receiving sections, and a light-reception signals outputted from the light-receiving sections are processed in the signal processing circuit to detect travel velocities of two directions of the measured object.

Optical velocimeter, displacement information measurement device and conveying and processing device

A first luminous flux emitted from the front end face of a LD is reflected by a mirror to be made incident on a detection point on the surface of a measuring object, and a second luminous flux emitted from the rear end face of the LD is reflected by another mirror to be made incident on the detection point. Scattered light from the first detection point is received in a photodiode. A signal processing circuit part calculates the frequency shift quantity of the scattered light based on output from the photodiode. As a result, a velocimeter is provided which detects the moving speed of a measuring object highly precisely.

Velocimeter, displacement meter, vibrometer and electronic device

An optical distance measuring device has an objective lens that condenses light from a light emission element to irradiate a measuring object and to form on the measuring object a light spot having a diameter not smaller than 10 &#x3bc;m and not larger than 30 &#x3bc;m. A light receiving lens condenses light reflected from the light spot on the measuring object to make the light incident on a photodetector through a pinhole having a diameter not smaller than 10 &#x3bc;m and not larger than 50 &#x3bc;m. With movement of the measuring object, detection signal of which an amplitude and an output level change according to a distance to the measuring object is obtained from the photodetector.

Optical distance measuring device and printing apparatus using the same

An optical moving information measuring apparatus comprising: light generating means for forming two light spots at a predetermined interval, on a surface of a moving object to be measured providing at least a light emitting source, a collimator lens for collimating light emitted from the light emitting source and an objective lens for irradiating the light passed through the collimator lens to the surface of the moving object; a beam splitter for rotating an optical axis of each of the two types of light reflected from the light spots and passed through the objective lens by a predetermined angle; a light receiving lens through which the two types of light from the beam splitter pass; a light receiving element for receiving the two types of light passed through the light receiving lens; and a processing part for calculating a time delay of one from the other of two types of output signals from the light receiving element obtained by movement of the moving object in order to obtain moving information of the moving object.

Optical moving information measuring apparatus and carrier system incorporating the same

An optical object identification apparatus has a light emitting-side optical system (), a light receiving-side optical system (), and a signal processing section (). The light emitting-side optical system () irradiates light from a light emitting device () via an objective lens () to a moving target object () such as printing paper sheets. The light receiving-side optical system () receives reflected light from the target object by means of the light receiving device () via an objective lens (), and outputs an output signal with a waveform corresponding to the surface projections and depressions of the target object (). The signal processing section () executes signal processing on the output signal by at least one signal processing method to identify the target object.

Optical object identification apparatus, and printing apparatus and object classification apparatus using same

An optical object identification device has a light emission element, an optical system condensing light from the light emission element, a photodetector integrated with a mask provided with a pinhole, and an identification unit for identifying a type of a measurement object by an output waveform from the photodetector.

Optical object identification device and printing apparatus using the same

In an optical movement detecting device, two semiconductor lasers irradiate an object with respective light beams to form two light spots on the object. Two light-receiving elements receive the two light beams reflected from the two light spots respectively and traveling in a predetermined direction. Based on a difference in phase between two signals S, Soutputted from the two light-receiving elements, a signal processor derives a movement speed of the object.

Optical movement detecting device and transport system using the same

A light beam from a light-emitting device is applied to a measurement object via a collimator lens and an object lens, and reflected light concentrated via the object lens among the reflected light from a light spot formed on the measurement object is split and concentrated by a beam splitter and a light-receiving lens. The reflected lights from the two regions inside the light spot located at a prescribed interval on a straight line parallel to the travel direction of the measurement object are made to pass separately through two pinholes, respectively, and the resulting reflected lights are respectively made incident on two light-receiving sections. Then, on the basis of the outputs of the two light-receiving sections, the travel speed and the quantity of movement of the measurement object are measured by an operating unit.

Growing community of inventors

Takarazuka, Japan

Hisakazu Sugiyama