Scanning apparatus in which a sensor is mounted within a transceiver casing and a single focusing means both forms a beam from a radiation source for delivery to a target and focuses a returned beam onto the sensor. A forward looking reflective surface is included in the path of one of the beams, causing that beam to be twice passed through the focusing means. The sensor faces the radiation source, thus avoiding the need for a separate lens for the returned radiation. The scanner is particularly useful in detecting retro-reflective targets.
An optical sensor comprising a light detector, a converging lens located between the light detector and a light source, the light rays from which are detected by the light detector, and a light shielding means provided on a part of the converging lens, the shielding means shielding light rays emitted from the light source, thereby reducing dependence of the amount of light rays to be detected upon angles of incidence with which the light rays enter into the converging lens of the optical sensor.
A pulsed LED photoelectric control apparatus operates in both the proximity mode and the retro-reflective mode. Field stop elements are manually inserted for operation in the retro-reflective mode and are quickly and readily removed for operation in the proximity mode in order to enable the same photo-electric control apparatus to be utilized in both modes.
An optical system for forming an image of at least a portion of an illuminated area on an object may comprise a lens positioned a spaced distance from the illuminated area on the object and an aperture stop positioned so that it is substantially co-planar with the image side focal plane of the lens. An occluding element is positioned between the lens and the illuminated area on the object so that the occluding element blocks a predetermined amount of light from a brightly illuminated region in the illuminated area but does not substantially block light from a less brightly illuminated region in the illuminated area.
These and other objects of the present invention are attained by apparatus for adjusting the position of a line of light in barcode space that includes a support frame having a rear housing containing a solid state imager and a pair of support arms extending forwardly from the front of the housing. An imaging lens is mounted between the arms for focusing an image of a target in barcode space upon the solid state imager along the optical axis of the imaging lens. Illuminating LEDs are mounted on either side of the imaging lens for illuminating the target. The illumination is passed through a pair of cylindrical lenses that are adjustably mounted upon the distal ends of the arm so that the light can be selectively positioned in barcode space.
According to the invention, a multilayered image sensor is back mounted to a plate. In that the scheme takes advantage of a high controllability of a mounting plate's thickness, the mounting scheme provides a tight control of holding forces with which an image sensor is secured in an imaging device. In that the scheme provides for back mounting of image sensor on a planar surface, the mounting system provides tight control of an imaging assembly's pixel plane to fixed point in space distance.
