JP2017097012A5 - - Google Patents

Description

Optical scanning device according to the present invention, the incident light source having a plurality of light emitting points, a deflector for査run the scan surface in the main scanning direction to deflect the light beam from the light source, the light beam from the light source to the deflector an incident optical system for, and a imaging optical system for guiding the light beam to the scanned surface which is deflected by the deflector, the incident optical system includes a main scanning stop which limits the light beam in the main scanning direction, a main scanning aperture And a sub-scanning diaphragm that restricts the light beam in the sub-scanning direction, and the pass position of each of the principal rays of the plurality of light beams emitted from the plurality of light emitting points in the main scanning diaphragm is the main scanning It is characterized by being different from each other in direction.

As described above, the main scanning stop 205 of the conventional optical scanning device includes the y-direction side ends 205a and 205b parallel to the z-axis.
Here, the end in the y direction is the side through which the luminous flux of the diaphragm passes, that is, the main scanning end of the aperture provided in the diaphragm, and the side through which the luminous flux of the diaphragm passes, ie, the aperture provided in the diaphragm. It means the end in the main scanning direction. In other words, the end portion in the y direction is an end portion in contact with the light beam in the main scanning direction at the stop.
Therefore, as shown in FIG. 4A, the principal rays 200a, 200b and 200c pass through the position of y = 0 in the main scanning stop 205. In the main scanning stop 205, the main rays 200a, 200b, and 200c pass through different positions in the z-axis direction because the sub-scanning stop 102 and the main scanning stop 205 are spaced apart. It is.

Claims (12)

A light source having a plurality of light emitting points;
A deflector for査run the scan surface in the main scanning direction to deflect the light beam from said light source,
An incident optical system for causing a light beam from the light source to enter the deflector;
An imaging optical system for guiding the light beam deflected by the deflector to the surface to be scanned ;
With
The incident optical system has a main scanning stop which limits the light beam in the main scanning direction, the main scanning aperture disposed in different positions, and a diaphragm sub-scanning limits the light flux in the sub-scanning direction,
An optical scanning device characterized in that the pass positions of the principal rays of the plurality of light beams emitted from the plurality of light emitting points in the main scanning stop are different from each other in the main scanning direction. Wherein the main scanning stop end in contact with the light beam in the main scanning direction, and wherein the end portion is non-parallel to the sub scanning direction can as viewed from the direction of the optical axis of the entering morphism optical system The optical scanning device according to claim 1. An angle formed with respect to farthest straight line passing through the two light emitting points in the main scanning direction among the plurality of light emitting points, said end portion when viewed from the direction of the optical axis is an angle formed with respect to the sub scanning direction The optical scanning device according to claim 2 , wherein the reference numerals are the same. The absolute value of the angle formed with respect to said end sub-scanning direction when viewed in the direction of the optical axis is greater than 0 degrees, according to 請 Motomeko 2 or 3 shall be the equal to or less than 60 degrees Optical scanning device. An angle formed with respect to the optical axis first principal ray emitted the light source or colleagues at the position of the stop pre-scan SL main when viewed from the sub-scanning direction, in the deflector of the first principal ray the incident position, the shift amount in the main scanning direction with respect to the case where the end portion when viewed from the direction of the optical axis is a flat row with respect to the sub scanning direction, you being a different code 請 the optical scanning device according to what Re or claim Motomeko 2 to 4. An angle formed with respect to the optical axis first centroid ray emitted the light source or colleagues at the position of the stop pre-scan SL main when viewed from the sub-scanning direction, in the deflector of the first centroid ray the incident position, the shift amount in the main scanning direction with respect to the case where the end portion when viewed from the direction of the optical axis is a flat row with respect to the sub scanning direction, you being a different code 請 the optical scanning device according to what Re or claim Motomeko 2-5. When the angle formed by the end portion with respect to the sub-scanning direction when viewed from the direction of the optical axis is θap, the amount of positional deviation due to defocusing of the focal point formed by the imaging optical system is tan ( The optical scanning device according to claim 2, wherein the optical scanning device changes in proportion to θap). Said end portion includes an optical scanning device according to what Re or claim 請 Motomeko 2-7 you characterized in that have a stepped shape. The incident optical system, to 請 Motomeko 1 you further comprising a first and a second main scanning stop that will be placed in different positions in Oite each other physician in the direction of the optical axis of the incident optical system 8 What Re or optical scanning device according to one of. Said light source, an optical scanning apparatus according to what Re or claim 請 Motomeko 1-9 you being a VCSEL. An optical scanning apparatus according to what Re of claims 1 to 10, a developing device for developing an electrostatic latent image formed on the surface to be scanned by the optical scanning apparatus as a toner image, developed the an image forming apparatus comprising: a transferring device for transferring the toner image to a transfer material and a fixing device for fixing the in the transfer material the toner image transferred. An optical scanning apparatus according to what Re of claims 1 to 10, and characterized in that by converting the code data outputted from an external device into an image signal and a printer controller to be input to the optical scanning device Image forming apparatus.