Abstract:
The invention provides a shield case to cover a body, the body having a main body and first and second connecting portions projecting from the main body and lying adjacent to each other along a first direction. The shield case includes first to forth conductive shells. The first and second shells cover an outer circumference of the main body; the third shell covers the first connecting portion; and the fourth shell covers the second connecting portion. The third shell is in contact with at least one of the first and second shells. The first or fourth shell is in contact with the second shell. The fourth shell is provided integrally with the first shell and is adjacent to the third shell along the first direction. The first or fourth shell may not contact the second shell if the third shell is contactable with both the first and second shells.
Abstract:
An inkjet printer prevents the paper from lifting away from the platen when the suction action of the platen is stopped, and thereby prevents paper jams and other printing problems. The printer 1 conveys the printing paper 12a while holding the paper 12a to the surface of the platen 19 by a suction mechanism 50. After the automatic paper cutting operation is completed, the leading end part 12b of the printing paper 12a is retracted from the cutting position B to the printing start position A on the platen 19, and the printer 1 waits for the next print job with the printing paper 12a held against the platen 19. When a power conservation mode or power off mode is entered, the control unit 61 of the printer 1 advances the leading end part 12b of the printing paper 12a from the printing start position A to the cutting position B so that the paper is held by the downstream-side paper feed roller 34 and pressure roller 35, and then stops the power supply to the suction mechanism 50 of the platen 19. The printing paper 12a can thus be prevented from rising away from the platen 19 while the vacuum action of the suction mechanism 50 is stopped.
Abstract:
A constant-temperature type crystal oscillator includes: a crystal unit that is installed on one principal surface of a circuit substrate, and chip resistors, which function as heating elements, and which are installed on the other principal surface of the circuit substrate so as to face a principal surface of the crystal unit, the chip resistors heating up the crystal unit to keep an operational temperature of the crystal unit constant. A heating metal film facing the principal surface of the crystal unit is provided on the one principal surface of the circuit substrate. A heat conducting material is interposed between the principal surface of the crystal unit and the heating metal film to perform thermal coupling therebetween. The heating metal film is thermally coupled to electrode terminals of the chip resistors via a plurality of electrode through holes.
Abstract:
A secondary vibration damping type crystal oscillator circuit is formed as a Colpitts type, in which a crystal unit is connected between base and collector terminals, a first capacitor is connected between emitter and collector terminals, and a second capacitor is connected between emitter and base terminals of a oscillating transistor. A region between the emitter and collector terminals or between the emitter and base terminals includes a reactance parallel circuit, in which an LC series circuit is connected in parallel to the first or second capacitor. The reactance parallel circuit has resonant characteristics that the reactance parallel circuit is made capacitive at an oscillating frequency in principal vibration mode of the crystal unit as an oscillating frequency, and a resonant frequency of the LC series circuit corresponds to the vibrational frequency in secondary vibration mode that is close to the principal vibration mode.
Abstract:
An inkjet printer prevents the paper from lifting away from the platen when the suction action of the platen is stopped, and thereby prevents paper jams and other printing problems. The printer 1 conveys the printing paper 12a while holding the paper 12a to the surface of the platen 19 by a suction mechanism 50. After the automatic paper cutting operation is completed, the leading end part 12b of the printing paper 12a is retracted from the cutting position B to the printing start position A on the platen 19, and the printer 1 waits for the next print job with the printing paper 12a held against the platen 19. When a power conservation mode or power off mode is entered, the control unit 61 of the printer 1 advances the leading end part 12b of the printing paper 12a from the printing start position A to the cutting position B so that the paper is held by the downstream-side paper feed roller 34 and pressure roller 35, and then stops the power supply to the suction mechanism 50 of the platen 19. The printing paper 12a can thus be prevented from rising away from the platen 19 while the vacuum action of the suction mechanism 50 is stopped.
Abstract:
The roll paper printer of the subject invention has a control to detect failure of a paper detector in accordance with a method for detecting such failure. The printer 1 is constructed so that the paper transportation path is open when the cover 3 to the roll paper compartment 10 is open and includes a paper detector 40 and a control unit 30 to determine if the paper detector 40 is faulty. A failure warning is provided by a warning indicator 7(S7, 8) to indicate failure of the paper detector 40 when the cover 3 has been open continuously for at least a first set time (S6) and the output state of the paper detector 40 has not changed even once to a no-paper state within the first set time. Preferably, the printing operation of the printer 1 is disabled upon determining that the paper detector 40 is faulty to permit replacement of the paper detector. Problems attributable to paper detector failure, such as soiling the platen with ink can thus be prevented.