Abstract: With a push of a maintenance button disposed on a printer, printer information mail is created based on information previously stored in a memory, and sent to a mail server. The sent mail is read by a support server, the support server extracts maintenance information that best suits the contents of the sent mail from a database, and sends it as maintenance information mail to the mail server in reply to the mail. When the maintenance information mail arrives at the printer, cleaning is performed or error remedy is displayed or printed, according to the contents of the maintenance information mail.

Abstract: A print system capable of exchanging data in the form of electronic mail between a plurality of computer systems using very low-cost communication via the Internet 28, rather than one-on-one communication. When the printer driver 30 of a personal computer 4 selects a personal computer 10 on another computer system as the destination for transmitting print data, the printer driver 30 and the print mail transmission utility 31a create print mail in which a mail header including print information is added to the print data for the contents of the mail, and the print mail is transmitted via the Internet 28 addressed to the personal computer 10. The print mail reception utility 31b of the personal computer 10 receives the print mail and prints the print mail on a printer 14 based on the print information included in the mail header.

Abstract: When the received mail is determined to be print mail in S981 based on its mail header, the program first determines in S982 what page description language is used to describe the print data in the mail. In S983, the program selects a printer which is being presently set to interpret that page description language. Then, in S1040, print data in the print mail is printed using the printer thus selected in S983. If there exists no printer appropriately set to interpret that page description language, the program selects in S983 a printer provided with a function to interpret that page description language. The program then sets the function mode of the printer into a mode to interpret the page description language. Then, in S1040, print data in the print mail is printed using the thus selected and set printer. Thus, the print mail is printed by a printer which can appropriately interpret the processing format of the print data included in the received print mail.

Abstract: When the print sheet number determined based on the mail header is equal to or higher than the predetermined value (“Yes” in S996), the print confirmation screen is displayed in S997 to request the user to indicate whether or not to print the print mail. If the program determines in S998 that the user has indicated his/her desire to print, then the mail is printed in S1030 and S1040. However, if the user has not indicated a desire to print, the print operation is not performed. With this configuration, not all received print mail is immediately targeted for printing. The user can defer printing of print mail having a large amount of data according to circumstances on the receiving end. The large amount of print mail data will not occupy the printer on the receiving end for a long period of time. Hence, urgent or important printing can be given a higher priority.

Abstract: An image forming apparatus is provided to smoothly form images corresponding to received image data even if the memory becomes full when collated printing is executed. If the memory never becomes full during collated printing, images for all of the pages are expanded to intermediate data, stored in a page memory, and complete collated printing is enabled. In the meantime, if the memory becomes full while the print data of part of a page is expanded to intermediate data and stored, the controller, controls so that the page memory can be written after collated printing is executed up to a page immediately before the partial page and the residual pages are printed in the form of collated printing. Therefore, even if the memory becomes full, printing can be executed in a form as close to collated printing as possible.

Abstract: A mail transmission/reception system, in which a user on the transmitting end, who wishes to revise or delete a print mail mistakenly sent to a remote user, can transmit a cancel mail to the destination address of the same remote user to have the specified print mail deleted on the remote user's computer system in S690, thereby preventing the print mail from being printed on the remote user's end. Also, the user on the transmitting end can know whether the printing has been prevented based on mail returned from the remote user in S660-S680 and can take appropriate measures when the mail cancellation has not been successful.

Abstract: A laser beam printer 1 is connected to a host computer and receives job data 100 from the host computer. The job data 100 includes a transmission time information 103. If the laser beam printer 1 is provided with a clock IC 98, a CPU 91 of the laser beam printer 1 reads a current time from the clock IC 98 and set the current time as receiving time information. On the other hand, if the laser beam printer 1 is not provided with the clock IC 98, then the CPU 91 sets the transmission time information 103 included in the received job data 100 as the receiving time information.

Abstract: An image forming apparatus is provided to smoothly form images corresponding to received image data even if the memory becomes full when collated printing is executed. If the memory never becomes full during collated printing, images for all of the pages are expanded to intermediate data, stored in a page memory, and complete collated printing is enabled. In the meantime, if the memory becomes full while the print data of part of a page is expanded to intermediate data and stored, the controller, controls so that the page memory can be written after collated printing is executed up to a page immediately before the partial page and the residual pages are printed in the form of collated printing. Therefore, even if the memory becomes full, printing can be executed in a form as close to collated printing as possible.

Abstract: In a mail reception side, it is judged in S994 whether or not the number of sheets required to print the received print mail becomes equal to or higher than a prescribed number. This judgment is performed based on the mail header added to the print mail. When the number of sheets to be printed with the print mail is equal to or higher than the prescribed number, the print data included in the print mail is compacted so that one-fourth the amount of printing paper will be needed. Thus, even if print mail containing a large number of pages for printing is received, the printing side can adjust the number of pages, into which the print mail is printed, without deleting the contents of the print mail. Accordingly, the time required for printing is also reduced to one-fourth the time required for printing at the original ax state. Hence, even if print mail containing a large number of pages for printing is received at an unexpected time, the time required for printing is automatically reduced.

Abstract: A print system capable of exchanging data in the form of electronic mail between a plurality of computer systems using very low-cost communication via the Internet 28, rather than one-on-one communication. When the printer driver 30 of a personal computer 4 selects a personal computer 10 on another computer system as the destination for transmitting print data, the printer driver 30 and the print mail transmission utility 31a create print mail in which a mail header including print information is added to the print data for the contents of the mail, and the print mail is transmitted via the Internet 28 addressed to the personal computer 10. The print mail reception utility 31b of the personal computer 10 receives the print mail and prints the print mail on a printer 14 based on the print information included in the mail header.

Abstract: To realize a current-to-voltage conversion IC and a photoelectric conversion IC in which the available frequency range does not become narrower as the conversion gain is increased, in a current-to-voltage conversion IC that has a differential amplifier to which a negative feedback resistor of variable resistance is connected and a photodiode connected to the input terminal of the differential amplifier so that the output current of the photodiode is converted into a voltage by means of the negative feedback resistor, the differential amplifier is provided with a switch for varying the capacitance of a capacitor used as a phase compensating element so that the resistance of the negative feedback resistor and the capacitance of the differential amplifier are varied in an interlocked manner in accordance with a signal fed from outside.

Abstract: An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first differential amplifier, a second negative feed back circuit which feeds back the voltage signal to the second differential amplifier, and a filter circuit which is provided at either the first or the second negative feed back circuit and which differentiates frequency characteristics during signal amplification in the first and second differential amplifiers. Frequency characterstic is selected through selection of one of the current values of the respective current sources in response to a sound quality adjusting signal.

Abstract: An information recording device can function as a facsimile, a copy machine and a printer. The device receives plural kinds of information to be recorded and judges the kind of the information thus received. The information received is recorded onto a paper. The device is provided with a plurality of paper trays, and a delivering unit delivers a recorded paper on which the information is recorded to one of the paper trays which is determined in accordance with the kind of the information to be recorded. Thereby, the recorded paper on which same kind of information is recorded is delivered to same one of the paper trays, and a user can easily discriminate the recorded papers of different information.

Abstract: An equalizer includes first and second differential amplifiers which have a common output and respective separate current sources, a first negative feed back circuit which feeds back a voltage signal extracted from the common output to the first differential amplifier, a second negative feed back circuit which feeds back the voltage signal to the second differential amplifier, and a filter circuit which is provided at either the first or the second negative feed back circuit and which differentiates frequency characteristics during signal amplification in the first and second differential amplifiers. A frequency characteristic is selected through selection of one of the current values of the respective current sources in response to a sound quality adjusting signal.

Abstract: The apparatus includes output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system. Negative feedback circuits are provided in the respective output stage amplifiers for reducing the amount of low-band negative feedback. Switch circuits are turned on in response to feedback signals from the respective negative feedback circuits for supplying the feedback signals at the input to the output stage amplifiers.

Abstract: In a diamond cutting saw blade, a plurality of slits 1 are formed at regular intervals on the outer periphery of a disc-shaped iron substrate 2, and a plurality of segment chips 3 are fixed onto the outer periphery of the disc-shaped iron substrate 2. Two trapezoidal concave portions 4 which expand outwardly are formed on both sides of the outer periphery of each segment chip 3. Further, a trapezoidal concave portion 5 is formed at the intermediate position of the segment chip 3 on a joint surface of the iron plate 2 so as to expand toward the joint surface. At the corner where a bottom surface 4a and a tapered surface (side surface) 4b of the concave portion 4 formed on the outer periphery intersect, there is formed a curved surface 4c having a radius of 1.0 to 2.5 mm. Similarly, in a concave portion 5 formed in the inner periphery of the segment chip 3, there is formed a curved surface 5 c having a radius of 1.0 to 2.

Abstract: A power amplifier of a digital cassette tape reproducing device is set to a value suitable to amplify an amplitude level of an audio signal from an analog signal reproducing system thereof and, when a digital signal reproducing system is selected, an audio signal therefrom is supplied to the power amplifier circuit without attenuation while increasing an amount of negative feedback of the power amplifier circuit, hence reducing amplification thereof to match an output level of the power amplifier circuit with that of the analog signal reproducing system to thereby improve S/N ratio and maintain high tone quality of the digital source.

Abstract: A perfecting printer for performing a double-face printing operation of printing images on obverse and reverse faces of at least one sheet on the basis of a series of print data input from an external device and a method for controlling the double-face printing operation of the printer. The perfecting printer includes a page memory having an empty area for storing a series of print data for the obverse and reverse faces of the sheet input from external device, and a control unit for judging as to whether the empty area is no longer available in the page memory while the series of print data are being stored into the page memory and forcibly printing print data for the obverse face of the sheet on the sheet when it is judged that the empty area is no longer available in the page memory and that only the print data for the obverse face of the sheet are completely stored in the page memory.

Abstract: A isolation amplifier circuit comprises: an operation amplifier provided with a first and second input terminals, an output terminal, and a feedback resistor for connecting the output terminal and second input terminal; a first emitter follower, for inputting a signal, connected to the first input terminal; a second emitter follower connected between the output terminal and the feedback resistor; a third emitter follower connected between the second input terminal and a first ground impedance; and a fourth emitter follower connected between the first input terminal and a second ground impedance. In the isolation circuit, dynamic resistances of the first, second, third, and fourth emitter followers are made identical with one another.

Abstract: A perfecting printer for performing a double-face printing operation of printing images on obverse and reverse faces of at least one sheet on the basis of a series of print data inputted from an external device and a method for controlling the double-face printing operation of the printer. The perfecting printer includes a page memory for storing as page data at least both of the first and second print data in the series of the print data, and a control unit for printing the first and second print data on both of the obverse and reverse faces of the sheet when it is judged that the page data to be printed on the reverse face of the sheet exists in the memory and promptly printing only the first print data on the obverse face of the sheet when it is judged that the page data to be printed on the reverse face of the sheet does not exist in the memory.