Recording apparatus and method for indicating decrease of ink remains

Abstract: A recording apparatus for recording by discharging plural kinds of ink from the recording head (244) to a recording medium comprises detection means (247) for detecting the decrease of ink remains of each ink of the plural kinds of ink, ink amount indication means arranged in a number smaller than the number of the plural kinds of ink, and signal outputting means for outputting signals which enables the decrease of ink remains having the least amount of ink remains to be displayed on the ink amount indication means (220,502,601) in accordance with the results of plural detections by the detection means (247). In this way, only the ink remains having the least ink remains among those kinds of ink in use is indicated on the display, not the ink remains of all the kinds of ink, thus making it possible to minimize the number of indication means to make the indication device simpler and smaller or minimize the area on the screen of the display (220,502,601) assigned for indicating the ink remains in order to save it for indicating more information other than the ink remains.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a recording apparatus and a method for indicating the amount of ink remaining. More particularly, the invention relates to a technique for indicating the amount of ink remaining for an ink jet recording apparatus. Related Background Art In an ink jet recording method, liquid ink is supplied to a recording head, and ink is discharged as droplets from the discharge ports of the recording head towards a recording medium to which the droplets adhere. In an ink jet recording method of this kind, it is general practice to employ a recovery system for sucking ink from the ink discharge ports (suction recovery) in order to remove, together with ink, any foreign particles (such as ink residue, paper particles and dust adhering to the ink discharge ports, and air bubbles in the ink discharge ports) that may cause defective operation when the recording head is not used for printing or recording and left intact for a long time, or to employ a recovery system for causing such foreign particles to be exhausted together with ink by pressurizing the ink supply system or performing a predetermined ink discharge operation (ink predischarge) instead of or together with these means for performing forced removal. For the ink jet recording method described above, there has been arranged a structure for issuing a warning or indicating an error if the amount of ink remaining is less than a given level when ink is consumed by these means for recording and executing recoveries. However, in accordance with the conventional system described above, problems are encountered in that it is not possible to know how the amount of ink remaining changes each time a recording or suction recovery is operated, nor is it possible to know the timing for preparing a new ink supply until the ink is completely exhausted. Also, for an ink jet recording method which uses various kinds of ink, such as the one adopted for a color ink jet recording method, it becomes extremely complicated if the amount of each color ink remaining should be indicated. Not only are the costs to prepare such a complicated display high, but also it requires extra space for the ink remaining amounts to be indicated on the display. This inevitably uses up space which should otherwise be available for indicating information other than the amount of ink remaining. There is also a problem, among others, that if the indication of the amount of ink remaining needs to be updated often, the other data processing for printing is held on standby while the controller is busy processing to update the ink amount remaining indication. Hence it takes more time to execute a recording, leading to a problem of lowered throughput of the apparatus as a whole. JP-A-3-159750 describes a color printer wherein the amount of each color ink remaining is indicated to a user. JP-A-62-288046 describes an ink jet recording apparatus wherein each ink tank is provided with a pair of electrodes between which a resistance exists only when ink is present in the tank. The electrodes for three color ink tanks are connected in series with a detector so that the detector indicates when any one of the three color ink tanks runs out of ink. The present invention is designed with a view to solving the problems described above. It is an object of the invention to provide a recording apparatus having a simple and small means for indicating the amount of ink remaining, and also to provide a recording apparatus capable of minimizing the reduction of recording speed resulting from the execution of indication processing of ink remains. In one aspect, the present invention provides a recording apparatus for recording on a recording medium using a recording head for discharging a plurality of different kinds of inks onto the recording medium, comprising detection means for determining the decrease with use of the apparatus in the amount remaining of each of the different kinds of inks, and ink amount indication means for providing an indication of the amount of ink remaining, characterised in that the ink amount indication means are arranged to indicate the amount of ink remaining for each of a number of inks smaller than the total number of different kinds of inks, and in that signal outputting means are provided for outputting a signal for causing, as the inks are consumed by use of the apparatus, said ink indication means to indicate for a group of the different kinds of inks information relating to the amount of ink currently remaining for the ink which the detection means determines currently has the smallest amount of ink remaining of the inks within that group. In another aspect, the present invention provides a method for indicating the decrease with use of the amount of ink available to a recording apparatus for recording on a recording medium using a recording head for discharging a plurality of different kinds of inks onto the recording medium, comprising detecting a decrease in the amount remaining of each of the different kinds of inks, and providing ink amount indication means for indicating the amount of ink remaining, characterised by providing ink amount indication means to indicate the amount of ink remaining for each of a number of inks smaller than the total number of different kinds of inks, and by causing, as the inks are consumed by use of the apparatus, said ink indication means to indicate for a group of the different kinds of inks information relating to the amount of ink currently remaining for the ink which the detection means detects currently has the smallest the amount of ink remaining of the inks within that group. With a recording apparatus embodying the present invention, it is possible to make the indication system smaller, and also to make the timing of replacement of each ink tank easily recognizable. Further, it is possible to prevent the recording time from becoming longer due to the indication of the amount of ink remaining. Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings, in which: Fig. 1 is a structural view which shows the external appearance of an ink jet type wordprocessor in accordance with one embodiment of the present invention. Fig. 2 is a structural block diagram which shows a control system of the apparatus represented in Fig. 1. Fig. 3 is an example of ink remain indication. Fig. 4 is a sequential flowchart of control procedures for a first embodiment. Fig. 5 is a sequential flowchart of control procedures for a second embodiment. Fig. 6 is a sequential flowchart of control procedures for a third embodiment. Fig. 7 is a sequential flowchart of control procedures for a fourth embodiment. Fig. 8 is a view which shows one example of ink amount indication means for use of black ink and color ink. Fig. 9 is a block diagram which shows the schematic structure of a recording apparatus of the present invention, which is applicable to an information processing apparatus. Fig. 10 is a view which shows the external appearance of an information processing apparatus. Fig. 11 is a view which shows the external appearance of an information processing apparatus provided integrally with a recording apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in conjunction with the accompanying drawings, the specific description will be made of each embodiment in accordance with the present invention. Fig. 1 is a structural view which shows the external appearance of one embodiment of a document processing apparatus (hereinafter referred to as a wordprocessor) having an ink jet recording apparatus as an apparatus to which the present invention is applicable. In Fig. 1, a reference numeral 210 designates a keyboard unit serving as an input device; 220, the unit of indication device rotatively held for displaying a document or the like to be inputted, which is structured to be folded up over the keyboard unit 210. In a portion at 103, an ink jet recording apparatus is incorporated. A reference numeral 105 designates a paper supporter for supporting a recording sheet when it is exhausted; and 106, a knob for feeding or removing a recording sheet manually. Fig. 2 is a block diagram which shows the structural example of the control system of the apparatus represented in Fig 1. The region indicated by a reference numeral 200 designates a microcomputer which is the main body of the wordprocessor. A reference numeral 201 designates a microprocessor unit (hereinafter referred to as the host MPU); 203, a ROM storing the wordprocessing programs and means for indicating ink remains which will be described later; 202, a RAM used as a work area when processing documents and others. The user inputs information into the microcomputer 200 through the keyboard 210, and confirms the contents of intended operation by observing the display unit 220 formed by a liquid crystal display and others. The region indicated by a reference numeral 230 designates an ink jet recording apparatus incorporated in it. A reference numeral 231 designates a microprocessor unit (hereinafter referred to as the printer MPU); 232, a ROM storing a controller for the recording apparatus and the program required for detecting ink remains which will be described later; 233, a RAM used as a work area when performing recording and others. The printer MPU 231 supplies driving pulses to a conveying motor driver 238, a carriage motor driver 241, a recovery system motor driver 235 to control the conveying motor 239, the carriage motor 242, and the recovery motor 236, while sensing the presence and absence of a recording sheet, the carriage positions, and the unit status of the recovery systems by use of a paper end sensor 240, a carriage home sensor 243, and a recovery system sensor 237. From the host MPU 201, printing instructions and recording data are transferred to the printer MPU 231 through an interface 204. From the printer MPU 231, inner information of the printer, such as ink remains, is transferred to the host MPU 201 through an interface 234. Here, a reference numeral 244 designates an ink jet recording head which is controlled by the printer MPU 231 to record the print data transferred from the host MPU 201 through the interface 204. Also, the recording head 244 installs on it two detachable ink tanks, that is, an ink tank 1 at 245 and an ink tank 2 at 246. In the ink tank 1, black ink (Bk) is retained. In the ink tank 2, three kinds of ink, yellow (Y), Magenta (M), and Cyan (C), are retained. Here, it is assumed that the three kinds of ink are arranged to be exchangeable at a time per tank, not by each kind of ink, and then, ink remains can be detected by the ink remain detection device 247 per ink. The results of detections are transferred to the printer MPU 231. Also, the host MPU 201 is structured to indicate on the display 220 the ink remains transferred from the printer MPU 231 through the interface 234. In this respect, as an ink detection device, it is possible to apply a known ink remain device of such a type as to detect the decrease of ink remains by sensing the lowered pressure in the ink passage, besides the device which calculates the ink remains by counting the dot numbers of ink discharged from the head. Now, on the display 220 described above, the ink remains are indicated in a mode represented in Fig. 3 as an example therefor, hence making it possible to confirm the ink amount currently remaining. As a display, it may be possible to adopt a mode whereby to arrange a plurality of light emitting diodes (LEDs) laterally or to use a liquid crystal display, for example. (First Embodiment) The description will be made of ink remain indication means in accordance with a first embodiment of the present invention using the structure described above. As an example, four kinds of ink, Bk, Y, M, and C, and one ink remain indication means are employed in this case, and the explanation is made in accordance with a sequential flowchart of control procedures shown in Fig. 4. At first, the host MPU 201 instructs the printer MPU 231 to output ink remains to the interface 234. Receiving this instruction, the printer MPU 231 detects the ink remains of Black ink in step S41. In step S42, it detects the ink remains of Y ink. In step S43, it detects the ink remains of M ink, and in step S44, it detects the ink remains of C ink. Then, proceeding to step S45, the printer MPU outputs to the interface 234 the ink remains of the ink color having the least amount thereof among the ink remains of Bk, Y, M and C detected in the steps S41 to S44, together with the kind of ink tank which retains the ink having the least amount of ink remains at that time. Thus, as shown in Fig. 3, the host MPU 201 indicates on the display 220 the ink remains and the kind of ink than thereof thus transferred from the printer MPU 231. With the structure described above, it is possible to attain making the ink remain indication means smaller, and at the same time, easily recognize the timing for each ink tank to be replaced. (Second Embodiment) Now, with the structure shown in Fig. 1 to Fig. 3, the description will be made of a second embodiment of ink remain indication means in accordance with the present invention. For explanation, the sequential flowchart of control procedures shown in Fig. 5 is used in this case. At first, the host MPU 201 instructs the printer MPU 231 to output ink remains to the interface 234. Receiving the instruction, the printer MPU 231 detects the ink remains of Bk ink in step S51. In step S52, it detects the ink remains of Y ink. In step S53, it detects the ink remains of M ink. In step S54, it detects the ink remains of C ink. Then, proceeding to step S55, the printer MPU outputs to the interface 234 the ink remains of Bk ink which has been detected in the step S51 as the ink remains in the ink tank 1 because the ink tank 1 retains only Bk ink in it. Next, proceeding to step S56, the printer MPU outputs to the interface 234 as the ink remains in the ink tank 2 the ink remains having the least amount thereof among those ink remains of Y, M, and C which have been detected in the steps S52 to S54, respectively, because the three colors of ink are retained in the ink tank 2. In this way, the host MPU 201 separately indicates on the display 220 the ink remains in the ink tank 1 and ink tank 2 as received from the printer MPU 231 in such a manner as illustrated in Fig. 8 in order to identify each of the ink tanks as the one for Bk use and the other for Y, M, and C use. In Fig. 8, ink bottles are illustrated each for the Bk use and color use, and then, as the ink remains are being reduced, each portion in the ink bottles, colored in black, is gradually decreased from the top to the bottom accordingly. With the structure described above, there is no need for the provision of indication means for all the four colors, but only one for the Bk ink retained in the ink tank 1 and the other for three colors retained in the ink tank 2, hence making it possible to reduce the size of the indication means significantly. Also, it becomes easier to recognize the kinds of ink whose remaining amount is reduced. (Third Embodiment) Next, using the structure shown in Figs. 1 to 3 the description will be made of an ink remain indication in accordance with a third embodiment of the present invention. For explanation, the sequential flowchart of control procedures shown in Fig. 6 is used with the timing for updating the ink remain indication per page as a unit, for example. At first, when a recording instruction is inputted through the keyboard 210, the host MPU 201 receives the ink remains from the printer MPU 231, and indicates them on its display in step S61. Then, proceeding to step S62, the host MPU transfers one-line portion of recording (print) data to the printer MPU 231 for recording. Thus, in step S63, it is determined whether or not the one-page portion of recording is completed. If not, the process returns to the step S62 for the execution of next-line recording. If it is found in the step S63 that the one-page recording is completed, the host MPU receives the ink remains from the printer MPU 231 in step S64, and updates the indication of ink remains. In this way, it is determined in step S65 whether or not the entire pages are recorded. If not, the process returns to the step S62 for the execution of next page. If completed, the process is terminated. As described above, it is possible to prevent the reduction of the throughput of printing operation due to ink remain detections by setting the timing and executing the updating of ink remain indication per recording, that is, per page in the present embodiment, for example. In other words, there is no need for the controller in the printer main body to operate the ink remain detection while each page is being recorded, thus making it possible to allow the controller to dedicate itself only to performing the data processing for the printing operation at that time. (Fourth Embodiment) Next, using the structure shown in Figs. 1 to 3 the description will be made of an ink remain indication in accordance with a fourth embodiment of the present invention. For explanation, the sequential flowchart of control procedures shown in Fig. 7 is used with the arrangement to update the ink remain indication per consumption of ink in an amount equivalent to one scale of the ink remain indication illustrated in Fig. 3, for example. At first, when a recording instruction is inputted from the keyboard 210, the host MPU 201 receives from the printer MPU 231 the ink remains having the least amount thereof among the Bk, Y, M, and C ink, and indicates it on the display in step S71. Then, in step S72, the host MPU calculates the ink consumption equivalent to one scale of indication illustrated in Fig. 3, for example. (Given the total ink quantity as xg, and the entire number of the scales, as 25, an ink consumption equivalent to one scale is x/25g). Then it is arranged that the printer MPU 231 is instructed to output to the interface an ink remains equivalent to an amount when the ink of (x/25g) is consumed, that is, an amount equivalent to one scale thus calculated. Subsequently, the process will proceed to step S73 where one-line recording data is transferred to the printer MPU 231 for recording. Then it is determined in step S74 whether or not any ink remains are output to the interface. If not, the process will return to the step S73 for execution of recording on the next line. If ink remains are output, the process will proceed to step S75 where the ink remain indication is updated, and then, returns to the step S73 for execution of recording on the next line. In other words, there is no way of indication even if any ink remains are detected while ink is being consumed in an amount equivalent to one scale illustrated in Fig. 3, for example. As a result, any indication of ink remains is not output to the interface, thus making it possible to implement the enhancement of the recording efficiency because there is no possibility that the MPU is caused to operate wastefully. As described above, it is possible to prevent the reduction of throughput by making an arrangement to display the ink remain indication per given amount of ink consumption. In accordance with the present invention, the structure is arranged, as described above, to indicate only the ink (whose remaining amount is so small that its indication becomes necessary). Consequently, there is no need for indicating all the ink remains of plural kinds of ink to be used. Also, it becomes easier to determine the timing for ink to be replaced, and at the same time, the indication device can be made smaller if an apparatus is provided with indication means dedicated to displaying ink remains. Further, if an apparatus shares use of a display screen, such as a wordprocessor, the area which the ink remain indication occupies on the screen can be made smaller, thus making more area available for displaying other information on it. Also, for an apparatus which uses a plurality of ink tanks each arranged to retain plural kinds of ink as its ink and ink tank structure, it is only necessary to provide ink remain indications which agree with the number of ink tanks installed. There is no need for indicating all the kinds of ink for its remains. It also becomes easier to recognize the timing for each tank to be replaced. Further, with the arrangement to make the timing for updating ink remains per page, it is possible to prevent the recording from taking more time due to the ink remain indications. It is also possible to minimize the recording time required for indicating ink remains, and change the ink remain indication smoothly by arranging to set the timing for updating ink remain indication per consumption of ink in an amount equivalent to one scale of the ink remain indication on the display. The present invention produces an excellent effect on a recording apparatus using an ink jet recording method, particularly the apparatus in which the flying droplets are formed by utilizing thermal energy for recording. Regarding the typical structure and operational principle of such a method, it is preferable to adopt those which can be implemented using the fundamental principle disclosed in the specifications of U.S. Patent Nos. 4,723,129 and 4,740,796. This method is applicable to the so-called on-demand type recording system and a continuous type recording system as well. Particularly, however, it is suitable for the on-demand type because the principle is such that at least one driving signal, which provides a rapid temperature rise beyond a departure from nucleation boiling point in response to recording information, is applicable to an electrothermal transducer disposed on a liquid (ink) retaining sheet or liquid passage whereby to cause the electrothermal transducer to generate thermal energy to produce film boiling on the thermoactive portion of the recording head; thus effectively leading to the resultant formation of a bubble in the recording liquid (ink) one to one for each of the driving signals. By the development and contraction of the bubble, the liquid (ink) is discharged through a discharging port to produce at least one droplet. The driving signal is more preferably in the form of pulses because the development and contraction of the bubble can be effectuated instantaneously. The liquid (ink) is discharged with a quicker response accordingly. The driving signal in the form of pulses is preferably such as disclosed in the specifications of U.S. Patent Nos. 4,463,359 and 4,345,262. In this respect, the temperature increasing rate of the heating surface is preferably such as disclosed in the specification of U.S. Patent No. 4,313,124 for an excellent recording in a better condition. The structure of the recording head may be as shown in each of the above-mentioned specifications wherein the structure is arranged to combine the discharging ports, liquid passages, and the electrothermal transducers as disclosed in the above-mentioned patents (linear type liquid passage or right angle liquid passage). Besides, the structure such as disclosed in the specifications of U.S. Patent Nos. 4,558,333 and 4,459,600 wherein the thermally activating portions are arranged in a curved region is also included in the present invention. In addition, the present invention is effectively applicable to the structure disclosed in Japanese Laid-Open Patent Application No. 59-123670 wherein a common slit is used as the discharging ports for plural electrothermal transducers, and to the structure disclosed in Japanese Laid-Open Patent Application No. 59-138461 wherein an aperture for absorbing pressure wave of the thermal energy is formed corresponding to the discharging ports. In addition, the present invention is effectively applicable to a replaceable chip type recording head which is electrically connected to the main apparatus and for which ink is supplied when the head is mounted on the main assemble, or to a cartridge type recording head having an ink tank integrally provided for the head itself. Also, it is preferable to additionally provide the recording head recovery means, preliminarily auxiliary means, and the like. To name them specifically, such constituents are capping means for the recording head, cleaning means, compression or suction means, preliminary heating means such as electrothermal transducers or heating elements other than such transducers or the combination of those types of elements. Also, it is effective for the stabilized recording to adopt a predischarge mode which performs discharging other than the regular discharge for recording. Further, as a recording mode of the recording apparatus, it may be possible to arrange an apparatus to be provided with at least one recording mode of full color having plural colors which differ from one another, full color prepared by mixing colors, or a major color such as black, irrespective of whether the recording head is formed integrally or formed by combining plural heads. Now, in the embodiments described above in accordance with the present invention, the description has been made of ink as liquid, but it may be an ink material which is solidified below the room temperature but liquefied at the room temperature or a liquid material, or as the ink is, in general, controlled within the temperature not lower than 30°C and not higher than 70°C to stabilize its viscosity for the provision of the stable discharge for an ink jet type described above, the ink may be such as to be liquefied when the applicable recording signals are given. In addition, while positively preventing the temperature rise due to the thermal energy by use of such energy as an energy consumed for changing states of ink from solid to liquid, or using the ink which will be solidified when left intact for the purpose of preventing the ink from being evaporated, it may be possible to adopt for the present invention the use of an ink having a nature of being liquefied only by the application of thermal energy, such as an ink capable of being discharged as ink liquid by enabling itself to be liquefied anyway when the thermal energy is given in accordance with recording signals, and an ink which will have already begun solidifying itself by the time it reaches a recording medium. In such a case, it may be possible to retain the ink in the form of liquid or solid in the recesses or through holes of a porous sheet such as disclosed in Japanese Laid-Open Patent Application No. 54-56847 or 60-71260 in order to enable the ink to face the electrothermal transducers. In the present invention, the most effective method for the various kinds of ink is the one capable of effectuating the film boiling method as described above. Further, as the mode of the recording apparatus in accordance with the present invention, it may be possible to adopt a copying apparatus combined with a reader in addition to the image output terminal which is integrally or independently provided for a word processor, computer, or other information processing apparatus, and furthermore, it may be possible to adopt a mode of a facsimile apparatus having transmission and reception functions. Fig. 9 is a block diagram which schematically shows the structure of a recording apparatus in accordance with the present invention in which the apparatus is applicable to an information processing apparatus having functions as a word processor, a personal computer, a facsimile apparatus, and a copying apparatus. In Fig. 9, a reference numeral 501 designates a control unit provided with a CPU such as a microprocessor, and various I/O ports to control the entire system of the apparatus by outputting control signals, data signals, and the like to each unit, and receiving control signals and data signals from each unit; 502, a display unit on the screen of which various menus, documentary information, and image data read by an image reader 507 are displayed among others; and 503, a pressure sensitive transparent touch panel arranged on the display unit 502 which allows items, coordinate positions, and other information to be inputted as indicated on the display unit 502 when its surface is depressed by a finger or the like accordingly. A reference numeral 504 designates an FM (Frequency Modulation) sound generator which stores as digital data the music information created by a music editor or the like in a memory 510 and/or an external memory device 512, and reads them from the memory and others to perform an FM modulation. The electrical signals from the FM sound generator 504 are transduced into the audible sounds by a speaker unit 505. A printer unit 506 is the apparatus to which the present invention is applicable as an output terminal of a word processor, personal computer, facsimile apparatus, copying apparatus, electronic typewriter or the like. A reference numeral 507 designates an image reader which is arranged on the feeding passage of source documents in order to photoelectrically read the data on them for facsimile and copying operations in addition to reading various other source documents; 508, a facsimile transmission and reception unit which performs the facsimile transmission of the data on the source document read by the image reader 507, and receives the transmitted facsimile signals for demodulation, and which also has a function to interface with the external devices; 509, a telephone unit which has various functions to serve as an ordinary telephone and an answering telephone as well so as to automatically take and record messages among others; and 510, a memory unit including the ROM which stores a system program, manager program, other application programs, character fonts, dictionaries, and the like, the RAM which stores the application program and text information loaded from the external memory device 512, and a video RAM among others. A reference numeral 511 designates a keyboard unit arranged to input text information and various commands; 512, an external memory device using a floppy disk, hard disk, or the like as its storing medium. In this external memory device 512, text information, music, or voice information, and user's application program and others are stored. Fig. 10 is a view which illustrates the external appearance of the information processing apparatus shown in Fig. 9. In Fig. 10, a reference numeral 601 designates a flat panel display which utilizes liquid crystal and others to display various menus, graphic information, and text information. This display is arranged to input the coordinates and specific items when the surface of the touch panel on the display 601 is touched as required by a finger or the like; and 602, a hand set which is used when the apparatus functions as a telephone unit. The keyboard 603 is detachably connected to the main body by use of a cord, through which various text information and data can be inputted. Also, the keyboard 603 is provided with various functional keys 604 and others; and 605, an insertion inlet of a floppy disk. A reference numeral 607 designates a sheet stacker in which the source documents are stacked for the image reader 607 to read, and the source document thus read are exhausted from the rear portion of the apparatus. Also, in a case of a facsimile reception, or the like, the recording is executed by a printer 606. In this respect, the above-mentioned display 601 may be a CRT, but it is desirable to use a flat panel such as a liquid crystal display using a ferroelectric liquid crystal because with such a display, it is possible to implement the miniaturization of the apparatus, and also, make it light. When the above-mentioned image processing apparatus functions as a personal computer or a word processor, the text information inputted through the keyboard unit 511 in Fig. 9 is processed by the control unit 501 in accordance with a given program, and is output to the printer unit 506 as images. When the apparatus functions as a receiver of the facsimile apparatus, the facsimile information inputted from a facsimile transmission and reception unit 508 is received by the control unit 501 for processing in accordance with a given program and is output to the printer unit 506 as reception images. Also, when the apparatus functions as a copying apparatus, a source document is read by the image reader 507, and the data on the source document thus read are transferred to the printer unit 506 through the control unit 501 and are output as copied images. In this respect, when the apparatus functions as a transmitter of the facsimile apparatus, the data on the source documents read by the image reader 507 are processed by the control unit 501 for transmission in accordance with a given program, and then, transmitted to the communication line through the facsimile transmitter 508. Here, it may be possible to arrange the above-mentioned apparatus as an integrated type in which a printer is incorporated in the main body as shown in Fig. 11. In this case, the portability will be further enhanced. In Fig. 11, the constituents having the same functions as those shown in Fig. 10 are designated by the corresponding reference marks. With the application of a recording apparatus of the present invention to a multi-functional information processing apparatus described above, it is possible to obtain a high-quality recording image, and at the same time, to enhance the functions of such apparatus still more. As has been described in detail, the present invention makes it possible to obtain a desired image perfectly without any defective images, because even when a recording element of recording means malfunctions, the image data which should be assigned to such recording element are transferred to the image data assigned to other recording element, thus complementing the intended recording by use of the image data thus provided for the other recording element.

Claims: A recording apparatus for recording on a recording medium using a recording head for discharging a plurality of different kinds of inks onto the recording medium, comprising: detection means (247) for determining the decrease with use of the apparatus in the amount remaining of each of the different kinds of inks; and ink amount indication means (210) for providing an indication of the amount of ink remaining; characterised in that the ink amount indication means (220) are arranged to indicate the amount of ink remaining for each of a number of inks smaller than the total number of different kinds of inks; and in that signal outputting means (231) are provided for outputting a signal for causing, as the inks are consumed by use of the apparatus, said ink indication means (210) to indicate for a group of the different kinds of inks information relating to the amount of ink currently remaining for the ink which the detection means determines currently has the smallest amount of ink remaining of the inks within that group. An apparatus according to claim 1, further comprising ink storage means (245,246) containing said plural kinds of ink and wherein said signal outputting means is arranged to output signals enabling the ink of said group having the least ink remaining to be determined in response to the determination by the detection means of the amounts of ink remaining in said ink storage means. A recording apparatus according to claim 1, wherein said detection means comprises a first detector (247) for determining the decrease with use of the apparatus of the amount of black ink remaining in a first ink tank and a second detector (247) for determining the decrease with use of the apparatus of the amount of a group of inks having colors other than black in a second ink tank; and wherein said ink amount indication means comprises a first ink amount indicator for indicating the decrease of the amount of ink remaining in said first ink tank and a second ink amount indicator for indicating the decrease of the amounts of inks remaining in said second ink tank; and said signal outputting means is arranged to provide a signal for enabling the decrease with use of the apparatus of the amount of black ink remaining in the first tank to be indicated by said first ink amount indication means in accordance with the result of the detection by said first detection means, and to provide output signals enabling the amount of the ink of said color inks which the detection means determines currently has the smallest amount remaining within the group of color inks to be indicated on said second ink amount indication means in accordance with the results of said plural detections by said second detection means. An apparatus according to any one of the preceding claims, wherein said detection means (247) is arranged to detect the amount remaining of an ink by detecting a decrease in pressure. An apparatus according to any one of the preceding claims, wherein said detection means (247) is arranged to detect the amount of an ink remaining by determining the amount of droplets of that ink which have been discharged from the recording head. A recording apparatus according to any one of said preceding claims, comprising a recording head having thermal energy generating elements for generating thermal energy to cause a change of state in ink to cause discharge of ink from discharge ports of the recording head. An image forming apparatus comprising a recording apparatus in accordance with any one of claims 1 to 6 and means (507) for reading images of a source document. An image forming apparatus comprising a recording apparatus in accordance with any one of claims 1 to 6, means (508) for transmitting image information, and means (508) for receiving signals. An image forming apparatus comprising a recording apparatus in accordance with any one of claims 1 to 6 and means (511) for inputting recording signals. An image forming apparatus according to claim 9, wherein said means for inputting recording signals is a keyboard (511). An information processing apparatus comprising a recording apparatus in accordance with any one of claims 1 to 6 and means for performing calculations. A method for indicating the decrease with use of the amount of ink available to a recording apparatus for recording on a recording medium using a recording head for discharging a plurality of different kinds of inks onto the recording medium, comprising: detecting a decrease in the amount remaining of each of the different kinds of inks; and providing ink amount indication means (210) for indicating the amount of ink remaining, characterised by providing ink amount indication means (220) to indicate the amount of ink remaining for each of a number of inks smaller than the total number of different kinds of inks; and by causing, as the inks are consumed by use of the apparatus, said ink indication means (210) to indicate for a group of the different kinds of inks information relating to the amount of ink currently remaining for the ink which the detection means detects currently has the smallest amount of ink remaining of the inks within that group.

Inventors: ASAKURA OSAMU, ISHIKAWA TETSUYA, IWATA KAZUYA, KANOME YUJI, KAWAZOE KENJI, NAGASHIMA MASASUMI, OHDE TAKAHIRO, SHIMAMURA YOSHIYUKI, TAKAHASHI SEIJI, ASAKURA, OSAMU, ISHIKAWA, TETSUYA, IWATA, KAZUYA, KANOME, YUJI, KAWAZOE, KENJI, NAGASHIMA, MASASUMI, OHDE, TAKAHIRO, SHIMAMURA, YOSHIYUKI, TAKAHASHI, SEIJI
Applicants: CANON KK, CANON KABUSHIKI KAISHA
Application year: 1995
Main classification: B41J2
IPC codes: B41J2