Circuit for protecting a laser indicator

Details Circuit for protecting a laser indicator Circuit for protecting a laser indicator

1997-11-06

1999-08-03

Lee, John D.

Coherent light generators

Particular component circuitry

Optical pumping

327514, 327542, 330288, G05F 322

Patent

active

059334410

ABSTRACT:
A circuit for protecting a laser indicator is disclosed in which a current amplifying circuit composed of two transistors drives a laser light emitting diode (LED) to generate a laser light. A base of one of the two transistors connects with a protective resistor and a variable resistor. The variable resistor is used to control the magnitude of a base current of the transistor and the protective resistor is used to prevent an overrating current. A diode is further coupled to a positive power input terminal of the current amplifying circuit to prevent the circuit for protecting a laser indicator from being damaged due to being reversely connected the polarities of the power source. Through a design of such a circuit, a stable laser light-spot is achieved and the components in the circuit will not be damaged.

REFERENCES:
patent: 3631268 (1971-12-01), Matthews
patent: 4109217 (1978-08-01), Brackett et al.
patent: 4565973 (1986-01-01), Nagano
patent: 4689499 (1987-08-01), Yee
patent: 5097145 (1992-03-01), Hayashi
patent: 5373518 (1994-12-01), Uchiyama et al.
patent: 5514989 (1996-05-01), Sato et al.
patent: 5539352 (1996-07-01), DuPuy
patent: 5554954 (1996-09-01), Takahashi

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