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US 2020/0212708 A1Published application
Image forming apparatus in which wiring pattern for withstand voltage test is laid out
AssigneeCanon Kabushiki Kaisha
InventorHironobu Teramoto
Life of this patent
Estimating the term…
Abstract
An interlock power supply stops supplying a voltage if AC power supply is supplying AC voltage and an interlock condition is satisfied, and supplies a voltage if AC power supply is supplying AC voltage and the condition is not satisfied. A non-interlock power supply supplies a voltage independently of the condition, if AC power supply is supplying AC voltage. A first wiring pattern that connects an interface and a switch drive circuit. A second wiring pattern is connected to the non-interlock power supply. A constant-voltage element is provided between a first section of the first wiring pattern and a second section of the first wiring pattern.
Claims16
An image forming apparatus comprising:
- an input portion to which an AC voltage is input from an AC power supply or to which a test voltage is input from a test power supply;
- a power supply line that connects the input portion and an AC load used in image formation to each other;
- a switch provided on the power supply line;
- an interlock power supply configured to stop supplying a voltage if the AC power supply is supplying the AC voltage and an interlock condition is satisfied, and configured to supply a voltage if the AC power supply is supplying the AC voltage and the interlock condition is not satisfied, the interlock condition being a condition where an interlock acts;
- a non-interlock power supply configured to supply a voltage independently of the interlock condition, if the AC power supply is supplying the AC voltage;
- an interface to which an external power supply is connected;
- a switch drive circuit configured to turn on the switch based on a predetermined switch-on signal in a state where the voltage from the interlock power supply is supplied, or due to the test voltage being supplied from the test power supply via the input portion and an operating voltage being supplied from the external power supply in a state where the voltage from the interlock power supply is not supplied;
- a first wiring pattern that connects the interface and the switch drive circuit to each other;
- a second wiring pattern that is connected to the non-interlock power supply;
- and
- a constant-voltage element provided on the first wiring pattern,
- wherein the constant-voltage element is provided between a first section of the first wiring pattern in which a distance between the first wiring pattern and the second wiring pattern satisfies a predetermined insulating condition, and a second section of the first wiring pattern in which the distance between the first wiring pattern and the second wiring pattern does not satisfy the predetermined insulating condition.
9 more elements
An image forming apparatus comprising:
- an input unit to which an AC voltage is input from an AC power supply or to which a test voltage is input from a test power supply;
- a power supply line that connects the input unit and an AC load used in image formation to each other;
- a switching unit configured to switch between a connecting state of connecting the input unit and the AC load to each other, and a disconnecting state of disconnecting the input unit and the AC load from each other, the switching unit being provided on the power supply line,
- a first power supply configured to stop supplying a voltage if the AC power supply is supplying the AC voltage and an interlock condition is satisfied, and configured to supply a voltage if the AC power supply is supplying the AC voltage and the interlock condition is not satisfied, the interlock condition being a condition where an interlock acts;
- a second power supply configured to supply a voltage independently of the interlock condition, if the AC power supply is supplying the AC voltage;
- a connecting unit to which an external power supply is connected;
- a switch drive unit configured to cause the switching unit to enter the connecting state when an operating voltage is being supplied from the first power supply or when the test voltage is being supplied from the test power supply via the input unit and an operation voltage is being supplied from the external power supply;
- a first wire that connects the connecting unit and the switch drive unit to each other;
- a second wire that is connected to the second power supply;
- and
- a constant-voltage unit provided on the first wire,
- wherein the constant-voltage unit is provided between a first section in which a distance between the first wire and the second wire satisfies a predetermined insulating condition, and a second section in which the distance between the first wire and the second wire does not satisfy the predetermined insulating condition.
9 more elements
Dependencies are inferred from the claim text.