Eyeball detection apparatus

Details Eyeball detection apparatus Eyeball detection apparatus

1996-12-20

1998-08-04

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351210, 351247, A61B 310, A61B 314

Patent

active

057902348

ABSTRACT:
An eyeball detection apparatus has a light-receiving device, a first determination circuit, and a second determination circuit. The light-receiving device receives a reflection image from the cornea of an eyeball of a user or a person being tested. The first determination circuit determines whether the signal of the reflection image from the cornea received by the light-receiving device exceeds a specified level. The second determination circuit determines whether the size of the reflection image from the cornea received by the light-receiving device falls in a specified range only when the first determination circuit determines that the signal of the reflection image from the cornea received by the light-receiving device exceeds the specified level. It is determined that the eyeball of the user or the person being tested has approached the apparatus only when the second determination circuit determines that the size of the reflection image from the cornea received by the light-receiving device falls in the specified range.

REFERENCES:
patent: 5280312 (1994-01-01), Yamada et al.
patent: 5657110 (1997-08-01), Konishi

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