Optical transmitting and receiving device for the contact-free r

Details Optical transmitting and receiving device for the contact-free r Optical transmitting and receiving device for the contact-free r

1988-07-15

1989-05-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237R, G06K 710

Patent

active

048333360

ABSTRACT:
An optical transmitting and receiving device for the contact-free reading of marks, particularly marks and bar codes. The device has a transmitter diode arranged in a plastic body which directs an oblique transmission beam onto a reference surface outside the plastic body. A receiver diode is arranged at an angle to the transmitter diode in the plastic body, whose receiver beam is likewise directed onto a reference surface. Instead of a glass optical system simple rectangular slotted diaphrams are provided and the transmitter and receiver beams intersect at one single point of intersection in the region of the reference surface.

REFERENCES:
patent: 3786238 (1974-01-01), Heisner
patent: 3937928 (1976-02-01), Sasaki et al.
patent: 4079261 (1978-03-01), Mullin
Beistle, Magnetic Tape Sensing, IBM Technical Disclosure Bulletin, 1971, pp. 58,59.
Uebbing et al, Handheld Scanner Makes Reading Bar Codes Easy and Inexpensive, Hewlett-Packard Journal, pp. 3-10, Jan. 1981.

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