Patent application number | Description | Published |
20100002278 | BEAM IRRADIATION APPARATUS - A beam irradiation apparatus includes: an optical element which changes a travel direction of a laser beam by being rotated in a predetermined direction; an actuator which rotates the optical element in the direction; a refractive element which is disposed in the actuator and rotates in association with rotation of the optical element; a servo beam source which emits a servo beam to the refractive element; a photodetector which receives the servo beam refracted by the refractive element and outputs a signal according to a position where the servo beam is received; and a power adjustment circuit which adjusts emission power of the servo beam source. The power adjustment circuit adjusts the emission power so that a reception amount of the servo beam in the photodetector becomes constant based on an output signal from the photodetector. | 01-07-2010 |
20100014139 | BEAM IRRADIATION APPARATUS - A beam irradiation apparatus includes: an actuator which scans a target region with a laser beam; a photodetector which receives a servo beam and outputs a signal according to a beam reception position; an optical unit which makes the servo beam displaced on the photodetector in association with driving of the actuator; and a position signal generation circuit that generates a signal according to the reception position of the servo beam based on an output signal from the photodetector. The position signal generation circuit has a signal removal circuit that removes a disturbance signal generated when the laser beam is incident on the photodetector, from an output signal of the photodetector. | 01-21-2010 |
20100078582 | BEAM IRRADIATION DEVICE AND POSITION SENSING DEVICE - A beam irradiation device includes an actuator that scans a target region with laser light in a two-dimensional direction, and a servo optical system that changes a traveling direction of servo light along with driving of the actuator. The servo optical system includes a splitting element that splits the servo light, a first position sensing device that receives a first beam split by the splitting element and outputs a signal at a light-receiving position in a first direction, and a second position sensing device that receives a second beam split by the splitting element and outputs a signal at a light-receiving position in a second direction different from the first direction. | 04-01-2010 |
20100188648 | BEAM IRRADIATION DEVICE AND LASER RADAR SYSTEM - A beam irradiation device includes: a laser light source for emitting laser light; an actuator which scans a targeted area with the laser light; a servo optical system which changes a propagating direction of servo light in response to driving of the actuator; a photodetector which receives the servo light to output a signal depending on a light receiving position of the servo light; an actuator controlling section which controls the actuator based on the signal to be outputted from the photodetector; and a laser controlling section which controls the laser light source based on the signal to be outputted from the photodetector. The laser controlling section controls the laser light source to emit the laser light in a pulse manner at a timing when the light receiving position of the servo light coincides with a predetermined targeted position. | 07-29-2010 |
20100225930 | BEAM IRRADIATION DEVICE AND POSITION DETECTING DEVICE - In a beam irradiation device, laser light emitted from a laser light source is entered into a mirror. An actuator pivotally moves the mirror into which laser light is entered, whereby a targeted area is scanned with the laser light. Servo light emitted from a semiconductor laser is entered into a hologram element. The hologram element is pivotally moved with the pivotal movement of the mirror. A diffraction pattern is formed on an exit surface of the hologram element. A photodetector receives servo light transmitted through the hologram element to output a signal depending on a light receiving position of the servo light. The scan width of servo light on the photodetector is increased by a diffraction function of the hologram element. | 09-09-2010 |
20110090516 | BEAM IRRADIATION DEVICE - A beam irradiation device includes a photodetector which receives servo light and outputs a detection signal depending on a light receiving position of the servo light, and a signal processing section which obtains the light receiving position based on the detection signal. In the above arrangement, the signal processing section has an A/D conversion circuit which converts the detection signal into a digital signal, and an error signal adjusting circuit which converts an error component signal to be outputted from the photodetector when the photodetector is not irradiated by the servo light, into a signal within a processable range of the A/D conversion circuit, and supplies the converted signal to the A/D conversion circuit. A first digital signal derived from the detection signal is corrected with a second digital signal derived from the error component signal. | 04-21-2011 |
20130002859 | INFORMATION ACQUIRING DEVICE AND OBJECT DETECTING DEVICE - Laser light emitted from a laser light source is converted into light having a dot pattern by a projection optical system for projection onto a target area. The projection optical system is configured such that the density of dots in a peripheral portion of the dot pattern is smaller than that in a center portion of the dot pattern in the target area. A dot pattern captured by irradiating a dot pattern onto a reference plane is divided into segment areas. A distance to each segment area is acquired by matching between dots in each segment area, and a dot pattern acquired by capturing an image of the target area at the time of distance measurement. The segment areas are set such that a segment area in the peripheral portion of the dot pattern is larger than a segment area in the center portion of the dot pattern. | 01-03-2013 |
20130002860 | INFORMATION ACQUIRING DEVICE AND OBJECT DETECTING DEVICE - An information acquiring device is provided with a projection optical system which projects laser light onto a target area with a predetermined dot pattern, and a light receiving optical system which captures an image of the target area. Segment areas are set on a reference dot pattern reflected on a reference plane and captured by the light receiving optical system. A distance to each segment area is acquired by matching between a dot pattern captured at the time of distance measurement and dots in each segment area. The segment area sizes differ depending on regions of the reference dot pattern. | 01-03-2013 |
20130050710 | OBJECT DETECTING DEVICE AND INFORMATION ACQUIRING DEVICE - The information acquiring device includes a projection optical system which projects laser light onto a target area with a predetermined dot pattern; a light receiving optical system which is aligned with the projection optical system away therefrom by a predetermined distance, and has an image pickup element for capturing an image of the target area; a correcting section which divides a captured image obtained by capturing the image of the target area by the image pickup element at a time of actual measurement into a plurality of correction areas, and correcting a pixel value of a pixel in the correction area with use of a minimum pixel value among all pixel values of pixels in the correction area for generating a corrected image; and an information acquiring section which acquires three-dimensional information of an object in the target area, based on the corrected image generated by the correcting section. | 02-28-2013 |