A device includes a current sensor, a first current monitor, and a second current monitor. The current sensor is to sense a current between an input node and an output node. The first current monitor is to disconnect the input node from the output node in response to the sensed current exceeding a first threshold current for a period exceeding a threshold period. The second current monitor is to disconnect the input node from the output node in response to the sensed current exceeding a second threshold current greater than the first threshold current.

An image forming deviceincludes: a photoreceptor; a longitudinal light emitting member constituted from light emitting element rows that are arranged in a lateral direction and are each constituted from light emitting elements arranged in a longitudinal direction; an optical member that is longitudinal and is disposed to condense light emitted from the light emitting elements onto the photoreceptor; and a hardware processor that: selects and causes one or more light emitting elements for each light emitting element row to emit light; acquires an exposure amount for each light emitting element row; calculates a distribution of the exposure amounts acquired for the light emitting element rows, and calculates a position in the lateral direction corresponding to a predetermined exposure amount in the distribution; and judges whether a difference between the calculated position and a reference position in the lateral direction at a reference time is less than a threshold value.

An optical scanning apparatus includes a deflector configured to deflect a light beam from a light source and scan a surface to be scanned in a main-scanning direction and a single imaging optical element configured to guide the light beam deflected by the deflector to the surface to be scanned. Scanning speeds of the light beam on the surface to be scanned at an on-axis image height and at an off-axis image height are different from each other, and conditions

0.0<(R1.sub.h/2+R2.sub.h/2)/(R1.sub.h/2R2.sub.h/2)<1.7 and

0.8<h/TC<2.0

are satisfied.

An image recording apparatus, including: a housing; an image recording portion held by the housing; a control board having a mounting face and disposed in the housing such that the mounting face extends along a perpendicular plane perpendicular to a height direction, a control circuit for controlling the image recording portion being provided on the control board; and a communication board having a mounting face and disposed in the housing such that the mounting face extends along the perpendicular plane, such that the communication board is distant from the control board in a direction along the perpendicular plane, and such that the communication board is located within a height range ranging to the control board from a distal end of a highest one of mounted components mounted on the control board, an interface circuit to be connected to a telephone line being provided on the communication board.

A measuring device includes a receiving device that detects measurement information indicative of a position and/or orientation of a position-modifiable component of a printing station having a print head whose position and/or orientation is adjustable by a motor and that transfers measurement information via a link. A receiving holder then introduces this receiving device into a structure that holds it at a defined position relative to the position-modifiable component. Suitable structures in which the receiving device can be introduced include a container-holding device and a receiving element for a container-holding device.

An image forming apparatus includes a first counter in which a number of light emitting occurrence for each of a plurality of light emitting elements configured to emit light onto an image carrier, is stored, and a processor configured to obtain a difference in the number of light emitting occurrences between a light emitting element having a larger number of light emitting occurrences and a light emitting element having a smaller number of light emitting occurrences, and to cause at least one of the light emitting elements to emit light, based on the difference.

A printer module includes a frame body, a drum, a print head and a print-head moving mechanism. The drum is detachably connected to the frame body. The print-head moving mechanism movably connected to the frame body moves the print head in a horizontal direction substantially perpendicular to a direction of gravity exerted on the print-head moving mechanism. The print-head moving mechanism includes: a shaft rotatably connected to the frame body; an actuating rod connected to the shaft and rotated to rotate the shaft; and an actuating member connected to shaft and rotated with rotation of the shaft, so that the print head is moved between a first position and a second position. Thus, the volume occupied by the printer module can be reduced, the user's operation can be simplified, the influence and interference of the gravity can further be eliminated to simplify the design of the print-head moving mechanism.

An image forming device according to an embodiment includes a photosensitive drum and a light-emitting unit with a plurality of light-emitting elements which form an electrostatic latent image on the photosensitive drum. A processor controls a storage unit to store a cumulative light emission time of each light-emitting element. The processor further controls the storage unit to store an adjustment time which is shorter than a longest cumulative light emission time of the light-emitting elements. When a predetermined condition is satisfied, the processor controls at least one of the light-emitting elements that has a cumulative light emission time which is shorter than the adjustment time to emit light until the cumulative light emission time thereof equals the adjustment time.

A laser scanning device includes a light source, a rotary polytope, a motor, a bearing, and a detection processing portion. The rotary polytope scans light emitted from the light source. The motor rotates the rotary polytope. The bearing rotatably supports a rotation shaft of the motor. The detection processing portion, in a case where the motor is driven at a first speed that is higher than a predetermined reference speed, performs detection of an abnormal state based on an atmospheric temperature detected at a position located within a predetermined first range from the bearing, and in a case where the motor is driven at a second speed that is lower than the reference speed, does not perform the detection of the abnormal state, wherein the abnormal state is a state where the temperature of the bearing has exceeded a predetermined allowable temperature.

An imaging device has a photoconductor with a surface that is selectively discharged by a light from a laser diode to create a latent electrostatic image for attracting toner for transfer to a media. A circuit drives the laser diode. The circuit has a switch for turning on and off the light, a resistor complementary to the laser diode selectively connectable to the switch, and a passive circuit component coupled to the laser diode. The passive circuit component is a delay line, inductor, choke, coiled wire, or ferrite bead is contemplated. It may also typify a length of copper tracing on a printed circuit board that supports the laser diode. The circuit causes an initial overshoot voltage spike in an on voltage pulse that is about 20% or more than the settled on voltage. The voltage spike dampens out in about one-fourth of a total voltage on time of the pulse.