Drivers and Lighting Units

Abstract

The invention discloses a driving device and a light emitting unit. The driving device includes: a driving circuit, which is used to provide a driving current to the light-emitting element according to the control voltage; a first detection circuit, which is used to detect the driving current; a second detection circuit, which is used to detect the first reference current (used as a reference of the drive current when emitting light) and a second reference current (used as a reference of the drive current when not emitting light); a first generation circuit that generates an addition operation by adding the first voltage and the correction voltage voltage as a control voltage when emitting light, and also generates a second voltage as a control voltage when not emitting light, the corrected voltage being derived by predetermined calculation; and a second generation circuit for generating a third reference current. The second detection circuit has a first adder circuit that adds a second reference current and a third reference current to generate a first reference current. The invention can accurately correct the driving current in the voltage driving method.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims the benefit of priority from Japanese Priority Patent Application JP 2012-222163 filed on October 4, 2012, the entire contents of which are incorporated herein by reference. technical field [0003] The present invention relates to a driving device for driving a light-emitting element and a light-emitting unit including such a driving device, and more particularly, to a driving device which is very suitable for driving a surface-emitting semiconductor laser and a driving device including such a driving device Light unit. Background technique [0004] In the field of laser printers, in order to meet the demands for higher-speed performance and higher-density mounting, it has been considered to realize higher-speed performance and higher density of surface-emission semiconductor lasers (hereinafter, simply referred to as "surface-emission lasers"). Density installation. However, the surface-emitt...

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Problems solved by technology

[0006] Although various driving methods have been representatively proposed to cope with such disadvantages, these methods respectively have the disadvantage that the control of these methods is not practical due to excessive complexity

However, in such a case, if the surface emitting laser is driven by applying a pulse signal, there is a disadvantage that the rising / falling edge of the waveform of the light output becomes less steep compared to the current pulse waveform

However, in the drive device disclosed in Japanese Unexamined Patent Application Publication No. 2010-251429, if the correction current is added to the drive current, the feedback loop tends to reduce the correction current, which makes it difficult to perform accurate correction on the drive current. corrected disadvantages

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