Abstract: According to one embodiment, a semiconductor device includes: a first insulating element and a second insulating element each controlled based on a control signal; a first control circuit configured to control selection of one of the first insulating element and the second insulating element based on the control signal; a first switch element; a second switch element; a second control circuit configured to control the first switch element based on an output of the first insulating element; and a third control circuit configured to control the second switch element based on an output of the second insulating element.

Abstract: According to one embodiment, a semiconductor device includes a substrate; a first transistor, a second transistor, a third transistor, and a fourth transistor; a first light emitting element and a second light emitting element; a first light receiving element configured to switch the first transistor and the second transistor to an ON state or to an OFF state; and a second light receiving element configured to switch the third transistor and the fourth transistor to the ON state or to the OFF state, wherein the first light emitting element and the second light emitting element are configured such that, when either one of the first light emitting element or the second light emitting element is turned to a lit state, the other one is turned to an unlit state.

Abstract: A holding member includes a first opposing portion (first inner wall surface) and a second opposing portion (second inner wall surface) which oppose side wall surfaces of a lens array. Side wall surfaces of the lens array on opposite end sides with respect to a longitudinal direction of the lens array are exposed from opposite ends of the first opposing portion and opposite ends of the second opposing portion.

Abstract: An optical scanning apparatus includes a light source, a light deflecting unit, an optical member, a casing, a cover member, and a detecting unit. The cover member is provided with a first opening permitting passage of a light beam emitted from the light source, a second opening permitting passage of the light beam deflected by the deflecting unit, and third and fourth openings which are provided in positions on a side opposite from the first and second openings with respect to the deflecting unit. Through the third opening, an outflow of the air from the cover member by rotation of said deflecting unit is relatively high. Through the fourth opening, an inflow of the air into the cover member by rotation of said deflecting unit is relatively high. The detecting unit is provided at a position where the air flow blowing through the third opening hits the detecting unit.

Abstract: The image forming apparatus stores a plurality of candidate formulas in a memory. Each of the candidate formulas is a formula for calculating a prediction formula for calculating a predicted value of the color misregistration amount based on an external exposure device temperature, which is a temperature of the atmosphere around the exposure device, an external machine temperature, and a heater temperature of a heater which heats the plurality of image forming units. The CPU determines the prediction formula from the plurality of candidate formulas according to the external exposure device temperature, the external machine temperature, and the heater temperature. The CPU calculates the predicted value of the color misregistration amount using the determined predicted formula, and performs a color misregistration correction according to the calculated predicted value.

Abstract: An arrangement is therefore employed in which a flexible flat cable is guided by a guide member situated at a position facing a metal rear plate and the flexible flat cable extending from a connector to the metal rear plate is brought into contact with a wall portion of the metal rear plate so that the flexible flat cable is grounded.

Abstract: An image forming apparatus forms a plurality of images of different colors on an intermediate transfer belt by a plurality of image forming portions. The image forming apparatus detects a color misregistration amount of the image formed on the intermediate transfer belt and performs image formation using a correction value based on the color misregistration amount. If an elapsed time from previous image formation is less than a predetermined time, the image forming apparatus predicts the correction value using the previous correction value and the temperature at that time and performs color misregistration correction. If the elapsed time from the previous image formation is a predetermined time or longer, the image forming apparatus predicts the correction value using the correction value and the temperature at the time when the elapsed time becomes a predetermined time or longer and performs the color misregistration correction.

Abstract: Disclosed is an image forming apparatus, including an optical scanning device, wherein the optical scanning device includes: a holding member configured to integrally hold a first cleaning member and a second cleaning member; a first guide member configured to guide a movement of the holding member; a second guide member configured to guide a movement of the holding member; a first groove portion; a second groove portion, and wherein when the holding member moves from end portions of the first guide portion and the second guide portion to an opposite side with respect to a central portion side and a first engaging portion and a second engaging portion of the holding member respectively pass in the first groove portion and the second groove portion, engagements of the first engaging portion and the second engaging portion with the first guide portion and the second guide portion are released.

Abstract: An image forming apparatus includes a third link portion which is rotatably connected to said first link portion at a position between said first connecting portion and said first moving portion so that said first moving portion and said second moving portion are moved toward said drum unit by rotation of said first link portion about said first connecting portion as a rotation shaft and by rotation of said second link portion about said second connecting portion as a rotation shaft in interrelation with slide of said slidable portion, and which is rotatable relative to the apparatus main assembly. The third link portion is out of contact with the optical print head at a portion corresponding to an end portion on the optical print head side.

Abstract: An image forming apparatus which includes an optical scanning device, wherein the optical scanning device includes: a holding member configured to integrally hold a first cleaning member and a second cleaning member; a first guide member configured to guide a movement of the holding member; and a second guide member configured to guide a movement of the holding member. A first protruding portion protrudes upward from an upper surface of the holding member and is provided at a position closer to an end portion of the holding member than the first cleaning member, and a second protruding portion protrudes upward from the upper surface of the holding member and is provided at a position closer to an end portion of the holding member than the second cleaning member. The first protruding portion and second protruding portion are provided for bending the holding member.

Abstract: An arrangement is therefore employed in which a flexible flat cable is guided by a guide member situated at a position facing a metal rear plate and the flexible flat cable extending from a connector to the metal rear plate is brought into contact with a wall portion of the metal rear plate so that the flexible flat cable is grounded.

Abstract: An optical scanning apparatus includes a light source, a light deflecting unit, an optical member, a casing, a cover member, and a detecting unit. The cover member is provided with a first opening permitting passage of a light beam emitted from the light source, a second opening permitting passage of the light beam deflected by the deflecting unit, and third and fourth openings which are provided in positions on a side opposite from the first and second openings with respect to the deflecting unit. Through the third opening, an outflow of the air from the cover member by rotation of said deflecting unit is relatively high. Through the fourth opening, an inflow of the air into the cover member by rotation of said deflecting unit is relatively high. The detecting unit is provided at a position where the air flow blowing through the third opening hits the detecting unit.

Abstract: Provided are a first seating face and a second seating face, to which a lower side of a holding member of an optical print head being moved from an exposure position toward a retracted position by a movement mechanism strikes in the direction of movement thereof. A light emission face of a lens array of the holding member that has abutted the first seating face and second seating face is thereby positioned on a movement path of a rubbing portion provided on a cleaning member that is inserted from an opening.

Abstract: A holding member includes a first opposing portion (first inner wall surface) and a second opposing portion (second inner wall surface) which oppose side wall surfaces of a lens array. Side wall surfaces of the lens array on opposite end sides with respect to a longitudinal direction of the lens array are exposed from opposite ends of the first opposing portion and opposite ends of the second opposing portion.

Abstract: Disclosed is an image forming apparatus includes an optical scanning device, wherein the optical scanning device includes: a holding member configured to integrally hold a first cleaning member and a second cleaning member; a first guide member configured to guide a movement of the holding member; a second guide member configured to guide a movement of the holding member, and wherein a first protruding portion that protrudes upward from an upper surface of the holding member is provided at a position closer to an end portion of the holding member than the first cleaning member, and a second protruding portion that protrudes upward from the upper surface of the holding member is provided at a position closer to an end portion of the holding member than the second cleaning member, the first protruding portion and second protruding portion being for bending the holding member.

Abstract: Disclosed is an image forming apparatus, including an optical scanning device, wherein the optical scanning device includes: a holding member configured to integrally hold a first cleaning member and a second cleaning member; a first guide member configured to guide a movement of the holding member; a second guide member configured to guide a movement of the holding member; a first groove portion; a second groove portion, and wherein when the holding member moves from end portions of the first guide portion and the second guide portion to an opposite side with respect to a central portion side and a first engaging portion and a second engaging portion of the holding member respectively pass in the first groove portion and the second groove portion, engagements of the first engaging portion and the second engaging portion with the first guide portion and the second guide portion are released.

Abstract: An image forming apparatus includes a third link portion which is rotatably connected to said first link portion at a position between said first connecting portion and said first moving portion so that said first moving portion and said second moving portion are moved toward said drum unit by rotation of said first link portion about said first connecting portion as a rotation shaft and by rotation of said second link portion about said second connecting portion as a rotation shaft in interrelation with slide of said slidable portion, and which is rotatable relative to the apparatus main assembly. The third link portion is out of contact with the optical print head at a portion corresponding to an end portion on the optical print head side.

Abstract: The image forming apparatus stores a plurality of candidate formulas in a memory. Each of the candidate formulas are a formula for calculating a prediction formula for calculating a predicted value of the color misregistration amount based on an external exposure device temperature which is a temperature of the atmosphere around the exposure device, an external machine temperature, and a heater temperature of a heater which heats the plurality of image forming units. The CPU determines the prediction formula from the plurality of candidate formulas according to the external exposure device temperature, the external machine temperature, and the heater temperature. The CPU calculates the predicted value of the color misregistration amount using the determined predicted formula, and perform a color misregistration correction according to the calculated predicted value.

Abstract: An image forming apparatus forms a plurality of images of different colors on an intermediate transfer belt by a plurality of image forming portions. The image forming apparatus detects a color misregistration amount of the image formed on the intermediate transfer belt and performs image formation using a correction value based on the color misregistration amount. If an elapsed time from previous image formation is less than a predetermined time, the image forming apparatus predicts the correction value using the previous correction value and the temperature at that time and performs color misregistration correction. If the elapsed time from the previous image formation is a predetermined time or longer, the image forming apparatus predicts the correction value using the correction value and the temperature at the time when the elapsed time becomes a predetermined time or longer and performs the color misregistration correction.

Abstract: A simple structure is provided to move an optical print head toward a photosensitive drum. An image forming apparatus includes an optical print head having a first link portion and a second link portion, a sliding portion configured to move by sliding as to an image forming apparatus main body, and an abutting portion where one end of the optical print head abuts. When the sliding portion moves by sliding, the first link portion and the second link portion pivot as to the sliding portion, with the one end of the optical print head abutting the abutting portion, and the optical print head moves toward the photosensitive drum.