Battery-free electronic teaching apparatus with keypad of piezo

Details Battery-free electronic teaching apparatus with keypad of piezo Battery-free electronic teaching apparatus with keypad of piezo

1990-10-30

1992-11-17

Apley, Richard J.

Education and demonstration

Question or problem eliciting response

Correctness of response indicated to examine by...

434335, G09B 700

Patent

active

051638444

ABSTRACT:
An electronic learning device (10) uses keys (12a-e) which self-generate an electric signal responsive to a key being pressed. The electric signal is sufficient to drive a display (18) for indicating the correctness of the response. Cards (14) provide a query and a plurality of possible answers, each possible answer associated with one of the keys (12a-e). A correct answer is encoded on the card.

REFERENCES:
patent: 4085523 (1978-04-01), Duncan
patent: 4303398 (1981-12-01), Yoseloff
patent: 4636977 (1987-01-01), Ikemoto et al.
patent: 4681548 (1987-07-01), Lemelson
patent: 4712092 (1987-12-01), Boldridge et al.
patent: 4857887 (1989-03-01), Iten

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