Laser light irradiator
US7123636B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2002 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N2005/0651
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A laser beam irradiation device according to the present invention is so constructed that it may increase or decrease the excitation electric current flowing through its semiconductor laser diode to enable a user to selectively practice both non-thermal and photo-thermal laser treatments.CPU 41 is responsive to switching-on and -off of an output-power switching unit S2 for sending a reference signal to an amplifier 472 via an I/O port 44 and a D/A converter 471, so that the amplifier 472 may provide at its output terminals a reference voltage, with respect to which a control reference voltage for a desired laser output can be determined.Semiconductor laser diode 35 radiates the laser beam from its opposite sides, and a photo-diode 473 receives one of the opposite laser beams to provide a light-accepting voltage at its output terminals. The so acquired light-accepting voltage is directed to an amplifier 474 for amplification, thereby obtaining the monitor voltage.The reference voltage and the monitor voltage are applied to a differential amplifier 475, and a differential voltage is amplified by an amplifier 476. Thus a controlled working electric current is made to flow in semicondu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.