JP2006133637A5 - - Google Patents

Claims (7)

A light source means, an incident optical system for guiding laser light emitted from the light source means to the deflecting means, and a scanning optical system for forming an image of the laser light deflected by the deflection surface of the deflecting means on the surface to be scanned; In an optical scanning device having
The incident optical system makes the laser beam guided to the deflecting surface of the deflecting unit incident on the deflecting surface with a width wider than the width of the deflecting surface of the deflecting unit in the main scanning section,
The scanning optical system has a plastic scanning lens including an incident surface not provided with an antireflection film,
The laser beam deflected by the deflecting surface of the deflecting means is incident on the incident surface of the plastic scanning lens in a P-polarized state, and
The laser beam deflected by the deflecting surface of the deflecting means is incident on the incident surface of the plastic scanning lens at an incident angle equal to or smaller than the Brewster angle over the entire effective scanning range . 2. The optical scanning device according to claim 1, wherein the light source means is a monolithic multi-laser light source that emits a plurality of laser beams . The optical scanning device according to claim 2 , wherein the monolithic multi-laser light source is a surface-emitting laser light source that emits a plurality of laser beams . Within the main scanning section, F is determined by the beam width D of the laser light incident on the deflecting surface of the deflecting means and the focal length f of the incident optical system before the maximum image height is scanned from the scanning center of the effective scanning range. 4. The optical scanning device according to claim 1, wherein the number (f / D) is 8 or more. 5. 4. The optical scanning device according to claim 2, wherein the monolithic multi-laser light source has a plurality of light emitting units at different positions in the main scanning direction and the sub-scanning direction. 5. . An optical scanning apparatus according to any one of claims 1 to 5, a photosensitive member disposed on said surface to be scanned, which is formed on said photosensitive member by a light beam scanned by said optical scanning device A developing unit that develops an electrostatic latent image as a toner image, a transfer unit that transfers the developed toner image onto a transfer material, and a fixing unit that fixes the transferred toner image onto the transfer material. An image forming apparatus. 6. The optical scanning device according to claim 1, and a printer controller that converts code data input from an external device into an image signal and inputs the image signal to the optical scanning device. An image forming apparatus.