Patent ID: 6445721
Filing Date: 2002-09-03
Classification: G01J,H01S

Abstract:
A laser diode light emission sensing circuit for sensing a luminous state of the laser diode, comprising:a burst signal producer for producing a burst signal which changes to a first state synchronously with light emitting timing of said laser diode, and which changes to a second state synchronously with a light outing timing of said laser diode; and a maintaining device which maintains a prescribed output state representing a luminous state of said laser diode in synchronous with changing to a first state of said burst signal in a term of a third state of a CELL signal which changes to said third state before starting a light emission term, wherein said laser diode repeats continually light emission and light outing, and which changes with a termination of said light emission term to a fourth state, the maintaining device canceling said prescribed output state maintained synchronously with changing to the fourth state of said CELL signal.