A combination range optical scanner includes a short distance laser and a long distance laser. A scan mirror is oscillated by a motor and scans a beam from one of the two lasers across a field of view. A controller turns the two lasers on and off such that both a short distance scan and a long distance scan are automatically performed. The rate at which the controller turns the lasers on and off may be synchronized with the oscillation rate of the scan mirror. A collection mirror may include two facets, integrally formed therewith, where the two lasers are respectively directed toward the two facets.

A bar code scanner includes aseparate transmitter and receiver, each being able to ultrasonically transmit and receive data, respectively. The receiver transmits an acknowledgement signal when a protocol is received, and sends the acknowledgement signal to the transmitter which, unless it receives the acknowledgement signal, will retransmit the protocol a predetermined number of times. The transmitter includes a receiver which monitors an ultrasonic frequency band for a time period in which transmission by the transmitter is not allowed. The time period corresponds to a time when another ultrasonic signal in the ultrasonic frequency band is detected by the receiver of the transmitter. Transmission by the transmitter is allowed as soon as the another ultrasonic signal is no longer detected by the receiver of the transmitter.

The system, which is especially suitable for use as a bar code scanner trigger which allows for hands-free scanner operation and non-contact triggering of the scanner by the operator, in one embodiment, comprises a switch and a switch actuator, with the switch mounted proximate to a movable part of the body, and the switch actuator located on the movable part of the body, which part is movable so as to move the switch actuator and switch to within a predetermined proximity of one another and thereby actuate the switch, which will actuate the electronic equipment switched thereby. After the switch has been actuated, moving the part of the body with the switch actuator thereon so as to move the switch actuator and switch beyond a predetermined proximity of one another will deactuate the switch, and thereby deactivate the electronic equipment switched thereby. In an exemplary embodiment, the switch actuator is disposed upon a finger via a switch actuator mount in the form of a glove, and the switch is disposed upon the back of the hand at a point proximate to the finger so that extending a finger as in a pointing motion actuates the switch, thereby activating the equipment and further so that retracting the finger deactuates the switch. In other embodiments multiple switches and switch actuators may be used in conjunction with multiple fingers or digits, and/or with predetermined patterns or combinations of switch actuations required to activate the electronic equipment.

A void and spot discrimination apparatus and method for successfully decoding bar code symbols having imperfections therein. A first and a second scan are performed, and a signal return is obtained, in which information is obtained related to a smallest size black bar and white space, as well as a largest size black bar and white space. The signal returns from the first and second scans is sent to a decoder, and third and fourth scans are performed. The signal returns from the third and fourth scans are altered based on the smallest/largest sizes obtained from the two previous scans, in order to eliminate potential ink spreads and print voids. The process is alternated in this manner until a successful bar code decoding is made.

The system, which is especially suitable for use a a bar code scanner trigger which allows for hands-free scanner operation and non-contact triggering of the scanner by the operator, in one embodiment, comprises a switch and a switch actuator, with the switch mounted proximate to a movable part of the body, and the switch actuator located on the movable part of the body, which part is movable so as to move the switch actuator and switch to within a predetermined proximity of one another and thereby actuate the switch, which will actuate the electronic equipment switched thereby. After the switch has been actuated, moving the part of the body with the switch actuator thereon so as to move the switch actuator and switch beyond a predetermined proximity of one another will deactuate the switch, and thereby deactivate the electronic equipment switched thereby. In an exemplary embodiment, the switch actuator is disposed upon a finger via a switch actuator mount in the form of a glove, and the switch is disposed upon the back of the hand at a point proximate to the finger so that extending a finger as in a pointing motion actuates the switch, thereby activating the equipment and further so that retracting the finger deactuates the switch. In other embodiments multiple switches and switch actuators may be used in conjunction with multiple fingers or digits, and/or with predetermined patterns or combinations of switch actuations required to activate the electronic equipment.