Abstract: A miniature scan module which is adapted to be installed as part of a terminal or other apparatus for the reading of bar codes has an integrated assembly of a laser diode and a photodetector which is rotatably mounted for reciprocation about an axis of rotation. The assembly is supported in whole or in part on and connected electrically to, a mounting board by flexures which extend between the integrated assembly and supports (posts) on the board. The assembly has a body with a wall and a platform. The wall supports the laser and has a reflective surface which directs light resulting from the scanning of the laser beam across the bar code to the detector. The assembly also carries printed circuits connected to the detector and the laser diode. Connections are made through the flexures to these printed circuits and to other circuits on the mounting board.
Abstract: A strain relief member of sheet metal is disposed within the housing of a modular connector having a locking bar which ordinarily is crimped into locking engagement with the wires of a multi-wire cable. With such an arrangement flexure of the wires occurs at the locking bar and the wires break thereby breaking the connection provided by the connector to equipment connected to the cable. The strain relief member has a tray portion over which the wires extend to contacts located near one end of the housing. A stem extends rearwardly from the tray portion out the housing and has arms which are crimped around the cable thereby providing strain relief. The tray has a slot therein which is disposed in alignment with the locking bar. When the locking bar is crimped, it fastens the strain relief member to the housing.
Abstract: Bar code readers using laser diodes conserve electrical power and limit output laser radiation to levels required by governmental regulation (1 milliwatt average power) by utilizing a laser diode having a output optical power vs laser current characteristic which has a slope efficiency (the ratio of the change in power to the change in current, .DELTA.P/.DELTA.I, which is less than 1 in the region where stimulated (laser) emission occurs. The laser is operated with current pulses having a duty cycle less than 100%, and preferably in the range from 50% to 20% in the stimulated emission region of its characteristic, such that the average output laser power does not exceed the level required by government regulations (1 mw) while the laser output during the pulses is greater than 1 mw.
Abstract: Miniature scan modules which occupy a volume of less than about 1 cubic inch so as to facilitate installation in any apparatus which requires scanning of a light beam across a target and detection of light reflected from the target. The miniature size of the scan module enables it to be incorporated in various apparatus, such as keyboards or terminals and provide them with the ability to read various symbols, particularly bar codes. The module has at least two printed circuit boards on at least one of which a source of a light beam, such as a laser diode or light emitting diode is mounted and another board which may be fixed in the apparatus in which the module is installed. The boards are interconnected by structure including a flexure which defines a pivot axis for the light source and the board on which it is mounted. The flexure is made up of a plurality of elements which are insulated from each other and provide separate conductive paths for electrical power and signals between the boards.
Abstract: An improved bar code scanning and reading apparatus which is adapted to be hand-held utilizes anamorphic optics for scanning and reading the code by providing a beam having an oblong cross-section in the nominal plane of the code. The oblong cross-section may be aligned with the bars of the code. The optics does not focus the beam in the longitudinal direction of the cross-section at the nominal plane of the code so that diffraction effects which would otherwise cause rotation of the cross-section of the beam to a position transverse to the bars of the code which would preclude reading of narrow bars, is avoided. The last lens of the anamorphic system may be a cylindrical lens which provides a line focus of a visible marker beam while at the same time providing the oblong cross-section of the beam which scans the code. The light from the vicinity of the code passes through the cylindrical lens and is collected by a toric reflector which projects the incoming light onto a photodetector.
July 11, 1986
Date of Patent:
April 11, 1989
Photographic Sciences Corporation
Kevork Arackellian, John A. Boles, Jay M. Eastman