A groove processing device (100) that forms a groove in a surface of an object using laser beams (LB) includes: a light source device (11) that outputs the laser beams (LB); a polygon mirror (10) that reflects the laser beams output from the light source device (11); a condensing optical system that is provided on an optical path of the laser beams (LB) reflected by the polygon mirror (11) and focuses the laser beams (LB); and a shielding plate (35) that is provided between the condensing optical system and the object at a position which blocks some of the laser beams (LB) focused through the condensing optical system and blocks some of the laser beams (LB). Among the laser beams (LB) focused through the condensing optical system, some of the laser beams (LB) that are not blocked by the shielding plate (35) form the groove in the surface of the object at a focus of the laser beams (LB). The shielding plate (35) is provided closer to the condensing optical system than the focus and is rotated with respect to the surface of the object so as to block the laser beams (LB) that do not form the groove.

A groove processing device (100) that forms a groove in a surface of an object using a laser beam includes: a light source device (11) that outputs the laser beam; a polygon mirror (10) that reflects the laser beam output from the light source device (11); and an optical system that is provided on an optical path of the laser beam reflected from the polygon mirror (10) and includes a condensing portion (13A) which transmits the laser beam reflected from one surface of the polygon mirror (10) so as to be focused on the surface of the object and a non-condensing portion (13B) which is provided outside the condensing portion (13A) and transmits the laser beam reflected from a corner portion, in which two adjacent surfaces of the polygon mirror (10) meet, so as not to be focused on the surface of the object.

A mounting assembly for mounting a mirror to a frame in a laser scanning unit of an electrophotographic image forming device includes a bracket attached between the frame and the mirror. The bracket includes a body having a first surface and a second surface transverse to the first surface. A first set of protrusions extends from the first surface for defining a first gap between the frame and the bracket that limits adhesive thickness therebetween when the first surface of the bracket is adhesively attached to the frame. A second set of protrusions extends form the second surface for defining a second gap between the mirror and the bracket that limits adhesive thickness therebetween when the second surface of the bracket is adhesively attached to the mirror.

An apparatus includes a detector, a light source configured to emit light, a reflecting apparatus having multiple reflective facets, and a mirror. The reflecting apparatus is configured to rotate around an axis and arranged to reflect the emitted light from the light source and reflect backscattered light. The mirror is arranged to reflect the backscattered light from the reflecting apparatus towards the detector.

An optical head comprises a substrate on which optical elements are arranged in a main scanning direction, a lens unit that transmits light emitted from the optical elements or light entering the optical elements, and a holder that holds the lens unit. The holder has a sidewall extending in the main scanning direction. The sidewall has a hole at a position facing the lens unit. A fixing member is provided in the hole. The fixing member fixes the lens unit to the sidewall.

This disclosure describes an example architecture for providing a delay line for optical techniques. The delay line architecture includes a focusing element that has a focal axis disposed parallel to its length. The line of symmetry provided by the focal axis obviates path-length-dependent aberrations caused by the off-axis beam translations. The systems described herein also provide varying geometries of movable mirrors, including a galvanometer mirror and a rotating polygonal mirror. The systems and methods described herein also provide techniques for generating and detecting coherent Raman spectra using a picosecond probe pulse.

A scanning optical device includes a scanning lens, a deflector, and a frame configured to support the scanning lens and the deflector. The deflector includes a substrate, a motor fixed to the substrate, and a polygonal mirror rotary driven by the motor. The scanning lens is arranged such that a longitudinal direction thereof is oriented in a main scanning direction of the deflector. The frame includes a supporting part configured to support the scanning lens. The supporting part is located such that the substrate and at least a portion of the supporting part overlap when viewed in a rotation axis direction of the motor.

An apparatus includes a deflecting unit deflecting a light flux from a light source to scan a scanned surface in a main scanning direction, and an imaging optical system guiding the deflected light flux the scanned surface. A width of the light flux is larger than that of a deflecting surface of the deflecting unit in a main scanning cross section when it is incident on deflecting surface. A refractive power in main scanning cross section of the imaging optical system is different between a first position through which an on-axis light flux passes and a second position through which an outermost off-axis light flux passes. A first region at one side is longer than a second region at the other side with respect to an optical axis of the imaging optical system on the scanned surface.

An optical element includes an optical surface for giving an optical effect to a light beam that passes therethrough. The optical surface includes a first region and a second region. The first region and the second region are smoothly continuous with each other. The optical surface has an absolute value of a maximum curvature at a boundary between the first region and the second region. The absolute value of the maximum curvature is smaller than a predetermined value.

Optical scanner and electrophotographic image forming device are provided. The optical scanner includes a light source; and a first optical unit, a deflection apparatus, and an f-θ lens, which are sequentially arranged along a primary optical axis direction of a light beam emitted from the light source. The light beam emitted from the light source is focused onto a scanning target surface after sequentially passing through the first optical unit, the deflection apparatus, and the f-θ lens. Optical scanning directions of the light beam emitted from the light source include a primary scanning direction and a secondary scanning direction which are perpendicular to each other, and along the primary scanning direction, the f-θ lens satisfies following expressions: SAG1>0, SAG2>0, and 0<(SAG1+SAG2)/d<0.8.