A power supply apparatus including a first circuit and a second circuit insulated from the first circuit includes an adjustment unit and a detector in the first circuit, a controller in the second circuit, and first and second communication units in the first and second circuits, respectively. The adjustment unit is configured to adjust power. The controller is configured to control the adjustment unit. The detector is configured to detect a parameter. The second communication unit is configured to perform wireless communication with the first communication unit. The first communication unit is operated with power supplied to the first communication unit by a signal generated in the first communication unit due to a signal output from the controller to the second communication unit, and transmits information about a result of detection by the detector to the second communication unit. The controller controls the adjustment unit based on the information.

A natural frequency measuring device includes a receiving unit and a measuring unit. The receiving unit receives information of an image formed on a recording medium with vibrations of different frequencies provided to a member used to form the image. The measuring unit measures a natural frequency of the member from a frequency response characteristic using a misregistration amount of the image represented by the information of the image received by the receiving unit.

Examples analyze at least one of a plurality of planes of image data of print content to determine media expansion characteristics for the print content based at least in part on the at least one of the planes of image data. Examples adjust, prior to printing the print content, at least one plane of image data based at least in part on the media expansion characteristics to thereby compensate for media expansion during printing of the print content.

An image forming apparatus includes an image forming unit, a temperature input unit, and an image processing unit. The image forming unit forms an image on a recording sheet. The temperature input unit receives an input of an environmental temperature. The image processing unit performs a preliminarily set process on the image based on the input environmental temperature. The process changes in accordance with the environmental temperature.

The present invention is directed to a technique for reducing communication errors in facsimile transmission while restraining an increase in the temperature of a motor during execution of jobs of different types when a temperature reduction control is executed.

A power supply apparatus including a first circuit and a second circuit insulated from the first circuit includes an adjustment unit and a detector in the first circuit, a controller in the second circuit, and first and second communication units in the first and second circuits, respectively. The adjustment unit is configured to adjust power. The controller is configured to control the adjustment unit. The detector is configured to detect a parameter. The second communication unit is configured to perform wireless communication with the first communication unit. The first communication unit is operated with power supplied to the first communication unit by a signal generated in the first communication unit due to a signal output from the controller to the second communication unit, and transmits information about a result of detection by the detector to the second communication unit. The controller controls the adjustment unit based on the information.

An image reading device includes a first image reading portion, a cooling portion, a second image reading portion, and a notification processing portion. The first image reading portion reads an image of a document sheet at a first reading position. The cooling portion cools the document sheet at a cooling position downstream in a feeding direction of the document sheet with respect to the first reading position. The second image reading portion reads an image of the document sheet at a second reading position downstream in the feeding direction with respect to the cooling position. In a case where a difference image different from a first image read by the first image reading portion, the difference image being included in a second image read by the second image reading portion has been detected, the notification processing portion provides a notification that the difference image has been detected.

An image forming apparatus includes an acquisition unit, a printing unit that performs a printing job, a communication unit, and a control unit. An installed device is an illumination device. Upon determining that a printing document is a first task document, the control unit controls the communication unit to transmit a first color change instruction. Upon determining that a printing document is a second task document, the control unit controls the communication unit to transmit a second color change instruction. The first color change instruction is an instruction for increasing a color temperature of illumination light. The second color change instruction is an instruction for decreasing a color temperature of illumination light.

A printing apparatus that has a plurality of functions including a printing function and is capable of executing printing with resolution of 300 dpi or more includes a plurality of operating units including a printing unit and a power supply unit. The power supply unit includes a substrate, an input terminal that receives an alternating voltage, a smoothing capacitor that smooths the alternating voltage, a thermistor that detects a temperature, and a comparator that compares a signal output from the thermistor with a standard signal and outputs a notification signal. The input terminal, the smoothing capacitor, the thermistor, and the comparator are mounted on the substrate. The supply of power from the power supply unit is stopped based on the state of the notification signal. A gap between the input terminal and the thermistor is longer than a gap between the input terminal and the smoothing capacitor.

A power supply apparatus including a first circuit and a second circuit insulated from the first circuit includes an adjustment unit and a detector in the first circuit, a controller in the second circuit, and first and second communication units in the first and second circuits, respectively. The adjustment unit is configured to adjust power. The controller is configured to control the adjustment unit. The detector is configured to detect a parameter. The second communication unit is configured to perform wireless communication with the first communication unit. The first communication unit is operated with power supplied to the first communication unit by a signal generated in the first communication unit due to a signal output from the controller to the second communication unit, and transmits information about a result of detection by the detector to the second communication unit. The controller controls the adjustment unit based on the information.