Semiconductor device, semiconductor laser driving device and image forming device
一种驱动设备、半导体的技术，应用在半导体激光器、激光器、激光器零部件等方向，能够解决得不到光量、激光开始产生时间变长等问题
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
no. 1 Embodiment approach
[0052] figure 1 Shown is a schematic circuit diagram of the semiconductor laser driving device in the first embodiment of the present invention.
[0053] exist figure 1 In the semiconductor laser driving device 1, since the forward current-light output characteristic (i-L characteristic) of the semiconductor laser Ld such as a laser diode changes due to temperature change or deterioration over time, it generally adopts APC control, that is, the light quantity of the semiconductor laser Ld Always keep constant. The semiconductor laser driving device 1 receives the light quantity of the semiconductor laser Ld through the photodiode Pd, and performs the above-mentioned APC according to the received light quantity. In addition, the following description will be made by taking the semiconductor laser drive device 1 used in an image forming device such as a laser printer or a digital copier as an example.
[0054]The semiconductor laser drive device 1 includes a semiconductor d...
no. 2 Embodiment approach
[0076] In the above-mentioned first embodiment, the first reference voltage Vref1 is input from the outside, but as described in the second embodiment of the present invention, a circuit for generating the first reference voltage Vref1 may be installed inside the semiconductor device 2. .
[0077] FIG. 2 is a schematic circuit diagram of a semiconductor laser driving device in a second embodiment of the present invention. Also, the same symbols are used in Figure 2 to represent the figure 1 equivalent or identical parts, and while omitting their descriptions only for different figure 1 part of the description.
[0078] Figure 2 is different from figure 1 where the figure 1 The reference voltage generation circuit 40 for generating and outputting the first reference voltage Vref1 and the output terminal VREFO for outputting the first reference voltage Vref1 are provided in the semiconductor device 2 of the present invention. Therefore, the figure 1 The semiconductor d...
no. 3 Embodiment approach
[0087] In the third embodiment of the present invention, in the above-mentioned second embodiment, the first switch SW1 and the second switch SW2 are respectively provided in the semiconductor device 2a to control the inverting signals input to the operational amplifier circuits 11 and 21. The voltage in the input terminal is switched, so as to perform the actions shown in Figure 2 and Figure 3.
[0088] Figure 4 Shown is a schematic circuit diagram of a semiconductor laser driving device in a third embodiment of the present invention. and also, Figure 4 In FIG. 2 , the same symbols are used to designate the same or identical components as those in FIG. 2 , and only the parts different from those in FIG. 2 will be described while omitting their description.
[0089] Figure 4 The difference from FIG. 2 is that while the first switch SW1 and the second switch SW2 are respectively provided in the semiconductor device 2a of FIG. 2, the memory circuit 30 in the semiconductor ...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More