Abstract: A light scanning device includes a deflection unit, a first imaging lens, and a second imaging lens. The first imaging lens has a bottom surface adhesively secured to a housing via a plurality of adhesion portions. The second imaging lens has a bottom surface adhesively secured to a top surface of the first imaging lens via a plurality of adhesion portions. The plurality of the adhesion portions interposed between the first imaging lens and the housing are symmetrically located with respect to a center position of the first imaging lens in a main-scanning direction. The adhesion portions interposed between the first imaging lens and the second imaging lens are symmetrically located with respect to the center position of the first imaging lens in the main-scanning direction, and are located outside in the main-scanning direction with respect to the adhesion portions between the first imaging lens and the housing.

Abstract: A light scanning device includes a deflection unit, a first imaging lens, and a second imaging lens. The first imaging lens has a bottom surface adhesively secured to a housing via a plurality of adhesion portions. The second imaging lens has a bottom surface adhesively secured to a top surface of the first imaging lens via a plurality of adhesion portions. The plurality of the adhesion portions interposed between the first imaging lens and the housing are symmetrically located with respect to a center position of the first imaging lens in a main-scanning direction. The adhesion portions interposed between the first imaging lens and the second imaging lens are symmetrically located with respect to the center position of the first imaging lens in the main-scanning direction, and are located outside in the main-scanning direction with respect to the adhesion portions between the first imaging lens and the housing.

Abstract: An optical scanning device includes a light source unit, a deflector, and a scanning lens. The deflector reflects first and second light beams emitted from the light source such that the beams scan a scanned surface in main scanning direction. The scanning lens is disposed between the deflector and the scanned surface, includes incident and emission surfaces, and focuses the first and second light beams on the scanned surface. At least one of incident and emission surfaces is an optical refractive surface in which first and second refractive surfaces through which the first and second light beams pass respectively are arranged in alignment in the sub scanning direction. An interval between a first generatrix of the first refractive surface and a second generatrix of the second refractive surface in the sub scanning direction increases from a center portion toward end portions of the scanning lens in the main scanning direction.

Abstract: An optical scanning device includes a light source unit, a deflector, and a scanning lens. The deflector reflects first and second light beams emitted from the light source such that the beams scan a scanned surface in main scanning direction. The scanning lens is disposed between the deflector and the scanned surface, includes incident and emission surfaces, and focuses the first and second light beams on the scanned surface. At least one of incident and emission surfaces is an optical refractive surface in which first and second refractive surfaces through which the first and second light beams pass respectively are arranged in alignment in the sub scanning direction. An interval between a first generatrix of the first refractive surface and a second generatrix of the second refractive surface in the sub scanning direction increases from a center portion toward end portions of the scanning lens in the main scanning direction.

Abstract: A lens-mounting structure according to the present invention is a lens mounting structure that glues a lens and a mounting surface of a support portion that supports the lens using an adhesive agent applied there between, to mount the lens to the support portion, characterized by setting a gluing surface area of the mounting surface of the support portion and the adhesive agent to be smaller than a gluing surface area of the lens and the adhesive agent.

Abstract: An optical scanning device includes a light source, a deflector, an incident optical system and one scanning lens. The scanning lens includes a first face and a second face. In a main scanning direction cross section of the scanning lens, when a scanning range is separated, with on axis as a reference, into an image height region of a first direction and an image height region of a second direction that is opposite to the first direction, the incident optical system is disposed on a side of the image height region of the first direction. Curvature of the first face in a sub scanning direction cross section decreases from on axis toward off axis in the main scanning direction, and curvature of the second face in the sub scanning direction cross section increases from off axis of the first direction toward the second direction in the main scanning direction.

Abstract: A housing includes a base portion for installation of an optical beam emission unit, a light guiding unit, and a deflection unit, and a cover portion that includes an indented heat emission channel that transmits heat in an inner portion of the housing to a fluid.

Abstract: An optical scanning apparatus includes a reflecting mechanism, a light receiving element and a restricting mechanism. The reflecting mechanism reflects a light beam such that the irradiation point of the light beam moves in a predetermined scanning direction. The light receiving element is arranged in a movement plane defined by the light beam reflected by the reflecting mechanism, and the light receiving element outputs a light reception signal for adjusting the irradiation timing of the light beam in accordance with reception of the light beam reflected by the reflecting mechanism. The restricting mechanism positions the light receiving element relative to the movement plane.

Abstract: An optical scanning device includes a light source which emits a light beam, a deflector, an incident optical system and one scanning lens. The deflector reflects and deflects/scans the light beam emitted from the light source. The scanning lens includes a first face facing the deflector and a second face on an opposite side to the first face, and performs imaging of the deflected/scanned light beam on a surface to be scanned. In a main scanning cross section, when an angle relative to an optical axis of an incident light beam which enters the scanning lens from the first face is ?in, and an angle relative to an optical axis of an outgoing light beam which is output from the second face toward the surface to be scanned is ?out, in an entire scanning region, a condition of 0.9<?in/?out<1.3 is satisfied.

Abstract: In a collimator lens, in a case where divergent light emitted from a position P1 at a distance S1 from a second face enters the second face and imaging is performed at a position P2 at a distance S2 from a first face, in a temperature range of 0° C. to 60° C. and in a range of the emission wavelength of the light source which changes within the temperature range, and when a minimum value of a wavefront aberration of an image, which is generated at the position P2 by the divergent light emitted from the position P1 in a range of 0<S1/S2?50, is WF1, and when a minimum value of a wavefront aberration of an image, which is generated at the position P2 when parallel light satisfying S1=? enters the second face, is WF2, a relationship of WF1<WF2 is satisfied.

Abstract: A housing (30) includes a base portion (30a) for installation of an optical beam emission unit (31), a light guiding unit (35a-39a, 35b-39b), and a deflection unit (32, 33), and a cover portion (30b, 30c) that includes an indented heat emission channel (30b1, 30c1) that transmits heat in an inner portion of the housing (30) to a fluid.

Abstract: A housing includes a base portion for installation of an optical beam emission unit, a light guiding unit, and a deflection unit, and a cover portion that includes an indented heat emission channel that transmits heat in an inner portion of the housing to a fluid.

Abstract: An image forming apparatus includes an image formation portion forming an image onto a recording medium in an electro-photographic process. An acquisition portion acquires image data and a storage portion stores in advance first and second image formation conditions for the electro-photographic process. A condition setting portion sets the first image-formation condition for an image formation operation, if data indicating a bar code is not included in image data acquired by the acquisition portion, and sets the second image formation condition for an image formation operation if image data indicating a bar code is included in image data acquired by the acquisition portion. A control portion allows the image formation portion to execute an image formation operation based on image data acquired by the acquisition portion according to the image formation condition set by the condition setting portion.

Abstract: A lens-mounting structure according to the present invention is; a lens mounting structure that glues a lens and a mounting surface of a support portion that supports the lens using an adhesive agent applied therebetween, to mount the lens to the support portion, characterized by setting a gluing surface area of the mounting surface of the support portion and the adhesive agent to be smaller than a gluing surface area of the lens and the adhesive agent.

Abstract: A housing (30) includes a base portion (30a) for installation of an optical beam emission unit (31), a light guiding unit (35a-39a, 35b-39b), and a deflection unit (32, 33), and a cover portion (30b, 30c) that includes an indented heat emission channel (30b1, 30c1) that transmits heat in an inner portion of the housing (30) to a fluid.

Abstract: An image forming apparatus includes an image formation portion forming an image onto a recording medium in an electro-photographic process. An acquisition portion acquires image data and a storage portion stores in advance first and second image formation conditions for the electro-photographic process. A condition setting portion sets the first image-formation condition for an image formation operation, if data indicating a bar code is not included in image data acquired by the acquisition portion, and sets the second image formation condition for an image formation operation if image data indicating a bar code is included in image data acquired by the acquisition portion. A control portion allows the image formation portion to execute an image formation operation based on image data acquired by the acquisition portion according to the image formation condition set by the condition setting portion.

Abstract: An input dither pattern determiner divides an input dither image to plural blocks, and determines an input dither pattern for each block. An output dither image portion converts the input dither pattern for each block to an output dither pattern. A reference emission time determiner portion determines a reference emission time for each block based on dark electric potential distribution and intermediate sensitivity distribution of a photoconductive drum, a light intensity distribution of a laser beam in a main scanning direction, and the output dither pattern. An area emission time calculator determines area emission time for each area based on a reference emission time for each block. An actual emission time calculator adjusts emission time for each area so that differences between reference emission times of blocks adjacent one another in the main scanning direction become a predetermined value or lower, and calculates actual emission time for each area.

Abstract: The object of this invention is to provide an image forming apparatus which is capable of obtaining an appropriate toner density with respect also to low exposure amount value (low gradation value) of the formed image, by using the conversion rule sufficiently approximating the characteristic between an exposure amount and an output time as a conversion rule for converting indicating values such as exposure amount value and gradation value into the output time (performing output control of the beam light to a light source). In this invention, the conversion rule is nonlinear so as to sufficiently approximate the characteristic between the exposure amount and the output time.