Optical seed sensor for a seed planter monitor

Details Optical seed sensor for a seed planter monitor Optical seed sensor for a seed planter monitor

1978-03-20

1979-08-07

Tollberg, Stanley H.

Article dispensing

With recorder, register, indicator, signal or exhibitor

B65B 5718

Patent

active

041635078

ABSTRACT:
An optical seed sensor for a seed planter monitor utilizes light emitting diodes and a rapidly-responding light-receiving solar cell mounted in a seed dispensing chute. A solar cell light shield with a slit narrower than the diameter of a typical seed is mounted adjacent to the solar cell. When a seed passes the light shield, the voltage output of the light-receiving solar cell is temporarily reduced in response to a change in intensity of light at the solar cell. Electronic circuitry converts such solar cell voltage fluctuations into electrical counting pulses for the seed planter monitor. The rapidly-responding solar cell, the partially shielded solar cell and the electronic circuitry cooperate to discriminate between closely spaced or partially overlapping seeds passing through the dispensing chute in order to achieve accurate seed counting.

REFERENCES:
patent: 3974377 (1976-08-01), Steffen

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