Controller for optical information reader
US9569651B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2016 |
| Grant date | Feb 14, 2017 |
| Priority date | — |
| Expiry date | Feb 24, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2007/10495
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an optical information reader controlled by this controller, a laser beam originating in light emitted by a laser diode is reflected by a scan mirror to scan optical information of a bar code or the like, reflected light therefrom is received by a photodiode to be converted to an electrical signal, and the optical information is read by processing the signal. In the controller, a main amp having a characteristic that a gain changes according to a frequency of an input signal amplifies the electrical signal, a detector detects an analog signal resulting from the amplification, and from a. detection output thereof, a MPU (on/off frequency control circuit) detects level of the analog signal and adjusts the gain of the main amp by changing an on/off frequency of the laser diode caused by an APC circuit (light emission on/off circuit), according to the detected level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.