PRINTING DEVICE

• Main Author: SASAKI KEIGO
• Format: Patent
• Language: English; Japanese
• Published: 22.03.2019
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PERFORMING OPERATIONS; PHYSICS; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TESTING; TRANSPORTING; TYPEWRITERS

To appropriately ensure the safety in a switching power supply circuit and suppress the power loss, according to the state of a relay.SOLUTION: A printer comprises a printing mechanism unit, a switching power supply circuit provided with a conversion circuit for converting AC power to DC power from a primary side circuit to a secondary side circuit, a control IC and a printing control circuit, and an SOC. The switching power supply circuit includes a resistor provided at a stage prior to a rectification circuit in the primary side circuit, a relay connected in parallel with the resistor, a bidirectional photodiode connected in parallel with the relay, and a phototransistor for receiving light of the photodiode. The photodiode emits light when prescribed voltage corresponding to the state of the relay is generated at both ends of the resistor. When the output from the photodiode having received the light of the phototransistor is acquired, the SOC puts a limitation on power supply to the secondary side circuit by using the control IC or the printing control circuit.SELECTED DRAWING: Figure 2 【課題】リレーの状態に応じて、スイッチング電源回路における安全性の確保と電力損失の抑制とを適切に行えるようにする。【解決手段】プリンターは、印刷機構部と、１次側回路から２次側回路に向かって電力を交流から直流に変換する変換回路を備えるスイッチング電源回路と、制御ＩＣ及び印刷制御回路と、ＳＯＣと、を備え、スイッチング電源回路は、１次側回路の整流回路の前段に設けられる抵抗と、抵抗と並列に接続するリレーと、リレーと並列に接続する双方向のフォトダイオードと、フォトダイオードの光を受光するフォトトランジスターとを有し、フォトダイオードは、抵抗の両端にリレーの状態に応じた所定の電位が発生した場合に発光し、ＳＯＣは、フォトトランジスターの光を受光したフォトダイオードの出力を取得した場合、制御ＩＣ又は印刷制御回路により２次側回路への電力供給を制限する。【選択図】図２