Distance measuring device

Details Distance measuring device Distance measuring device

1996-05-24

1998-04-21

Voeltz, Emanuel T.

Boots, shoes, and leggings

396 99, 396120, 396106, 396104, 2502014, 2502016, G03B 1336

Patent

active

057425248

ABSTRACT:
In order to improve the accuracy and reliability of a distance measurement device of the light-projecting type, the device is provided with a reference voltage generator for generating a reference voltage having a level dependent upon whether or not a light is being projected. The distance measurement device includes a light projecting circuit for projecting pulsed light onto an object, a light receiving circuit for receiving the light projected by the light projecting circuit and reflected by the object, current-to-voltage conversion circuitry for converting a current output by the light receiving circuit into a corresponding voltage, amplifier circuitry for amplifying the output signals of the current-to-voltage conversion circuits, an integration circuit for integrating the output signal of the amplifier circuit, a level judgement circuit for judging the level of the output signal of the integration circuit by comparing it with a reference voltage, and an arithmetic circuit for switching the reference voltage depending on whether the light-projecting circuit is projecting light and for calculating the distance of the object based on the output of the level judgement circuit.

REFERENCES:
patent: 5128529 (1992-07-01), Nagaoka et al.
patent: 5204714 (1993-04-01), Nonaka et al.
patent: 5444511 (1995-08-01), Seki et al.
patent: 5572012 (1996-11-01), Saito et al.

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