Foldable compact recording apparatus

Abstract: According to the present invention, there is provided a recording apparatus comprising a first housing (1) having a control unit for controlling a recording mechanism for recording onto a recording medium (4) and a feed mechanism for feeding said recording medium (4), a second housing (2) connected movably to said first housing in recording, and having an attaching portion (3) for attaching said recording mechanism thereto and said feed mechanism, and an operation portion, which is unnecessary to operate at the non-service time of the recording apparatus, and covered with said second housing (2) at said non-service time, but is opened by the rotation of said second housing in recording, whereby the recording apparatus is placed in a thin form convenient for the transportation or storage at the non-service time or in a suitable form for the conveyance of the recording medium (4) at the service time, and said operation unit unnecessary at the non-service time can be protected.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a recording apparatus for recording onto a recording medium, and more particularly to a recording apparatus capable of taking an appropriate form depending on the service or non-service time. Related Background Art In recent years, host computers have been made in compact size as typically found in personal computers, and more recently, notebook type computers of A-4 size have spread widely. Correspondingly, recording apparatuses which are output devices have been developed in smaller sizes, whereby the notebook and slender parallelopiped types have appeared so as to be not only portable but also storable in the drawer of desk. In particular, recording means (recording head) of the ink jet type in which the ink is discharged by the use of heat energy can be readily fabricated with an arrangement having a high density of liquid channels (arrangement of discharge ports) by forming electricity-heat converters, electrodes, liquid channel walls and a ceiling plate as the film on a substrate by a semiconductor fabrication process such as etching, vapor deposition or sputtering, thereby allowing for further compactization. However, with the progress of compactization for the transportation and storage, the difference (gap) between the optimal form for the service and that for the non-service has become evident, bringing about some inconveniences. That is, it is preferable that the apparatus is as thin and compact in geometry as possible for the transportation or storage, whereas it is desirable on account of the utilization that the apparatus is retained in a shape suitable for the insertion, conveyance and exhaust of the sheet which is a recording medium, when used for the recording. Such a shape is generally quite different from a flat shape suitable for the transportation and storage. If the conveyance passage of sheet is sought to approximate a preferable horizontal path, recording of the sheet is performed in a vertical direction, so that a recording head must be configured to be oriented in a longitudinal direction, when the recording apparatus is in the service state, thereby having a considerable height. And this may lead to an unstable attitude at the service time as the compactization and lighter weight of the whole apparatus have progressed. It is required that unnecessary parts at the non-service time, such as an interface (I/F) connector, a power supply connector and a dip switch, are protected from being stained or damaged by the transportation and storage. A printing apparatus which can adopt different spatial configurations for when it is in use and when it is being transported is disclosed in U.S. 4725157. This printing device has a housing assembly which comprises a pair of housings which are rockably supported, with their respective open end portions abutting each other. A platen is disposed about an abutment region where the open end portions abut. A keyboard is provided on the one housing while a printing element is disposed inside another housing. When the printing device is in a non-usable position, the two housings extend along one plane thus defining a flat, rectangular outline of the housing assembly. When the device is in a usable position, the housings are rocked relatively, thus defining a substantially L-shaped outline of the housing assembly. As the housings rock in this matter, the printing element is brought into a printing position, where the element faces the platen. SUMMARY OF THE INVENTION The present invention provides an ink jet recording apparatus for recording by discharging ink onto a recording medium in accordance with claim 1. An embodiment of the present invention aims to resolve the aforementioned problems, and to provide a recording apparatus highly reliable and readily usable by taking an optimal form of the apparatus depending on whether it is used or not. An embodiment of the present invention provides a recording apparatus in which an operation unit unnecessary to operate at the non-service time for the transportation and storage, comprising for example connectors, is protected from being stained or damaged. Also, an embodiment of the present invention provides a compact and light recording apparatus which is retained in a compact shape when not used, while in a functional and stable state when used. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal cross-sectional view schematically showing the constitution of a recording apparatus according to a first embodiment of the present invention. Fig. 2 is a partial perspective view schematically showing the structure of an ink discharge portion of a recording head as shown in Fig. 1. Fig. 3 is a schematic perspective view showing a state of the recording apparatus as shown in Fig. 1 at the non-service time. Fig. 4 is a schematic front perspective view showing a state of the recording apparatus as shown in Fig. 1 at the service time. Fig. 5 is a schematic rear perspective view showing a state of the recording apparatus as shown in Fig. 1 at the service time. Fig. 6 is a longitudinal cross-sectional view schematically showing a recording apparatus according to a second embodiment of the present invention. Fig. 7 is a schematic side view of a recording apparatus according to a third embodiment of the present invention. Fig. 8 is a schematic longitudinal cross-sectional view showing the internal structure of a recording mechanism unit for the recording apparatus of Fig. 7. Figs. 9A and 9B are perspective views showing the states of a recording apparatus according to a fourth embodiment of the present invention at the non-service state for the transportation and storage in Fig. 9A, and when a power source unit is separated therefrom in Fig. 9B. Figs. 10A and 10B are perspective views showing the states of the recording apparatus according to the fourth embodiment of the present invention at the service time, as seen from the front face side in Fig. 10A and from the rear face side in Fig. 10B. Fig. 11 is a cross-sectional view showing a constitution of the recording apparatus according to the fourth embodiment of the present invention in the service state. Fig. 12 is a perspective view showing the service state of a recording apparatus according to a fifth embodiment of the present invention. Figs. 13A and 13B are perspective views showing the assembled forms of a recording apparatus according to a sixth embodiment of the present invention in the non-service state and the service state, respectively. Figs. 14A and 14B are explanation views showing the assembling form of a recording apparatus according to a seventh embodiment of the present invention in sequence. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below with reference to the drawings, wherein one of the objects is to provide a recording apparatus readily usable and highly reliable by taking an optimal apparatus form depending on whether it is used or not. First, a recording apparatus of the type in which the supply of electric energy to the recording apparatus is performed using an electric cord will be described. Fig. 1 is a schematic longitudinal cross-sectional view of a recording apparatus according to the first embodiment of the present invention. Note that the solid line in Fig. 1 indicates a service state of the recording apparatus and the two-dot chain line indicates a non-service state. In Fig. 1, 1 is a recording mechanism unit, which is composed of a recording head (recording means) 11, a platen 12, a paper feed roller 13, a guide shaft 14 for guiding the reciprocatory movement (main scan) of the recording head 11 along a recording medium 4, a driving motor (not shown) for driving the recording head 11 (or a carriage) in reciprocating motion, mechanical components required for the recording such as a belt mechanism (not shown) to transmit the power of the driving motor, a sensor and a motor. 2 is a control unit which is composed of a control substrate 21, an interface connector 22, a panel switch portion 23, and control and interface related components. Fig. 1 shows an ink jet recording apparatus as the recording apparatus, in which the recording head 11 is an ink jet recording head which discharges the ink by the use of the heat energy, and comprises electricity-heat converters for generating the heat energy. Also, the recording head 11 performs the recording by discharging the ink through discharge ports by the use of the pressure change arising due to growth and shrinkage of bubbles produced by film boiling caused by the heat energy to be applied by the electricity-heat converters. Fig. 2 is a partial perspective view schematically showing the construction of an ink discharge portion in the recording means (recording head) 11. In Fig. 2, there are arranged a plurality of discharge ports 52 at a predetermined pitch on a discharge port formation face 51 spaced a predetermined clearance (e.g., about 0.5 to 2.0 millimeter) away from a recording medium 4, with electricity-heat converters 55 (e.g., heat generating resistors) for generating the ink discharge energy each being disposed along a wall face of each liquid channel 54 communicating a common liquid chamber 53 to each discharge port 52. In this embodiment, the recording head 11 is mounted in a positional relation in which the discharge ports 52 are arranged in a direction crosswise to a main scan direction (a moving direction of the recording head 11). Thus, the recording head 11 is configured in such a way that on the basis of an image signal (record data) or a discharge signal, corresponding electricity-heat converters 55 are driven (energized) to film boil the ink within the liquid channels 54, so that the ink is discharged through the discharge ports 52 by the pressure produced at that time. Fig. 3 is an external perspective view of the recording apparatus (first embodiment) as shown in Fig. 1, in which the recording mechanism unit 1 and the control unit 2 are rotatably joined at a hinge portion 3 (two positions on the left and right sides). Fig. 3 shows the recording apparatus of thin notebook type in the non-service state, which is very convenient for the transportation and storage. Fig. 4 is an external perspective view showing the recording apparatus (first embodiment) as shown in Fig. 1 in the service state. In Figs. 3 and 4, the recording mechanism unit 1 can be turned about 90 degrees around the hinge portion 3 from the non-service state of Fig. 3 to the service state of Fig. 4, and in the service state, a recording medium 4 is inserted from behind the apparatus, and exhausted to the front side of the apparatus. Fig. 5 is a rear perspective view of the recording apparatus as shown in Fig. 4 in the service state as looked from the rear side. In the service state, an interface connector 22, a power source connector 26, and a dip switch 27 are provided on a back face of the control unit 2 exposed by the bending, as shown in Fig. 5, whereby an input/output portion (I/O) protected in the non-service state (Fig. 3) is placed in an enable state when used (Figs. 4 and 5). That is, the apparatus is a thin type as indicated by the two-dot chain line in Fig. 1 when not operated (or used), but the apparatus is placed in a recordable state by bending the recording mechanism unit 1 and the control unit 2 about 90 degrees at the time of recording operation (service). For the recording operation, the interface connector 22 and the power supply switch 26, which are exposed as shown in Fig. 5, are connected, and a power supply SW (not shown) is turned on to start the recording operation. In the first embodiment as above described, a paper supply tray 15 which can be opened and closed is provided on a back face in the service state (a bottom face in the non-service state) in which the recording mechanism unit 1 is stood, whereby at the recording operation, the paper supply tray 15 is opened to insert a recording medium 4 such as a paper or plastic thin plate thereinto. And the apparatus is turned on-line to start the recording in a state in which the recording medium 4 is supplied between a paper feed roller 13 and a pinch roller 16. A recording signal sent from the control unit 2 through the hinge portion 3 to a motor or the recording head 11 in the recording mechanism unit 1, via a signal line (not shown) connected to the recording mechanism unit 1. The recording medium 4 is conveyed on to a platen 12 and set at a predetermined leading position, and then the recording head is driven in reciprocating motion (scanning) along a guide shaft 14 by a driving source such as a pulse motor (not shown) to perform the recording. If one line of recording is terminated, the recording medium 4 is fed by a predetermined amount, then stopped at a next line position, and the next line is recorded by moving the recording head 11 again. By repeating such scanning and feed, one page of recording is performed. The recording mechanism unit 1 for performing such recording is accommodated in a case 17 provided separately from the control unit 2. While in the first embodiment an ink jet recording head integral with an ink tank is used as the recording head 11, it should be noted that an ink jet recording head separate from the ink tank, and further, a recording head relying on the thermal transfer method, thermal method, wire dot method, laser beam method, or other methods may be used. The recording medium 4 recorded is delivered from the recording mechanism unit 1, and exhausted on to a case 24 of the control unit 2. The case 24 of the control unit is provided with an extension tray 25 formed of a wire so that it can be extended or retracted, whereby if the extension tray 25 is drawn out at the recording, the recorded recording medium 4 can be laid down on the extension tray 25 without falling away from the recording apparatus. A panel switch portion 23, provided on the upper face of the case 24 in the control unit 2, is disposed at a position out of the conveying path of the recording medium 4, that is, at a right or light end portion on the upper face of the case 24, so that it can be operated even when the recording medium 4 is laid down. Fig. 6 shows a recording apparatus according to a second embodiment, in which a U-shaped conveyance passage is provided along the peripheral surface of paper feed roller 13 so that the recording medium 4 is inserted from the front face of the recording mechanism unit 1 and exhausted out of the same face. As shown in Fig. 6, the recording medium 4 is inserted into the recording mechanism unit 1 so as to follow the upper face of a case 4 for the control unit 2, and fed like a U-turn to the position of a pinch roller 16 by a pinch roller 20 and a paper guide 19. Thereafter, the recording is performed by the recording head 11, and the paper is exhausted on to the upper face of the case 4 for the control unit 2. In the recording apparatus as shown in Fig. 6, a paper conveying mechanism is unnecessary on the rear face side of the recording apparatus. And the rear face side of the recording apparatus can be contacted against the wall or the like by using connectors for attaching the cord transversely, thereby suppressing a space for installing the recording apparatus. Other portions have the same constitution as in the first embodiment, wherein corresponding parts are indicated by the same numerals. It will be appreciated that the recording head 11 for use may rely on any one of a variety of methods exemplified in the first embodiment, in addition to the ink jet recording head. According to the first and second embodiments as shown in Figs. 1 to 6, the recording mechanism unit 1 and the control unit 2 are respectively contained in separate cases 17, 24, which are rotatably joined together by the hinge portion 3 (rotatable about 90 degrees), so that the apparatus is placed in a form suitable for the conveyance of the recording medium 4 when used, or in a thin form convenient for the transportation and storage when not used, whereby a recording apparatus excellent in handling and compact in size can be obtained. Also, an interface connector 22, a power supply connector 26 and a dip switch 27 for the setting of the apparatus functions, which are operation parts unnecessary during the non-service, provided on the control unit 2 or the case 24, are arranged on a plane covered by the case 17 of the recording mechanism unit 1 during the non-service, whereby a recording apparatus can be obtained in which such operation parts can be effectively protected from being stained or damaged at the transportaion and storage. Fig. 7 is a schematic side view showing a recording apparatus according to a third embodiment of the present invention. Fig. 8 is a schematic longitudinal cross-sectional view showing the internal structure of the recording mechanism unit 1 in the recording apparatus of Fig. 7. In this embodiment, the recording mechanism unit 1 is joined with the control unit 2 by means of two links (linkages) 41 provided on the left and right sides, as shown in Fig. 7 and is configured to change the form at the service and the non-service time by the use of the parallel movement but not rotation. That is, the recording mechanism unit 1 is movable between a non-service position (lowered position) as indicated by the two-dot chain line and a service position (raised position) as indicated by the solid line. The recording medium 4 is conveyed in a direction as indicated by the arrow in Fig. 7. Fig. 8 shows the service state. In Fig. 8 , near an recording medium insertion opening 42, there are disposed a pickup roller 43, a separation plate 44 and a separation spring 45. The frictional coefficient of a surface of the separation plate 44 is set to be higher than that of the recording medium 4, and lower than that of the pickup roller 43, whereby the separation plate is pressed against the pickup roller 43 by the separation spring 45. A plurality of sheets of recording medium inserted between the pickup roller 43 and the separation plate 44 are separated each one over a slanted plane of the separation plate 44, and each sheet is then fed to the paper feed roller 13. Subsequently, after being recorded by the recording head 11 at a position of the platen 12, the recording medium is exhausted on to a paper exhaust tray 18 by a paper exhaust roller 46. The embodiment as shown in Figs. 7 and 8 can be realized to the same effect as in the first embodiment as previously described, and in addition, the upper face of the control unit 2 can be also used as the paper supply tray to make more effective use of the space. According to the first to third embodiments as above described, there is provided a recording apparatus which can be readily changed to an optimal form at the service time and the non-service time, because the recording apparatus is divided into the recording mechanism unit 1 and the control unit 2, which are stored in respective cases 17 and 24 and connected by the hinge portion 3 or coupling to be rotatable or movable in parallel movement, and the connector portion 28 such as the interface connector 22 and the power supply connector 26 is arranged on a mating face between the recording mechanism unit 1 and the control unit 2. And it can provide the recording apparatus in which the connector portion 28 such as the interface connector 22 or the power supply connector 26 which is an operation unit not operated during the non-service time can be securely protected during the non-service time. Next, a recording apparatus in the form in which the supply of electrical energy to the recording apparatus is made by using a power supply adaptor attachable thereto will be described below. In the embodiments hereinafter described, the recording medium is conveyed in a straight direction, but it is more preferable to provide a U-shaped conveyance passage as previously described in the second embodiment. Figs. 9 and 10 show a fourth embodiment of the present invention. In these figures, Fig. 9 shows a non-service state, in which Fig. 9A shows an integrated form and Fig. 9B shows a state in which a power source unit is separated from the state as shown in Fig. 9A. Fig. 10 shows a service state, in which Fig. 10A is a view as looked from the front side, and Fig. 10B is a view as looked from the rear face side, with the power source unit separated from the state of Fig. 10. In Figs. 9A, 9B, 10A and 10B, 1 is a recording mechanism unit, 2 is a control unit, and 8 is a power source unit. Note that the recording mechanism unit 1 and the control unit 2 will be detailed in connection with Fig. 11. Also, the recording mechanism unit 1, the control unit 2 and the power source unit 8 are electrically connectable in the service state. Note that a housing 17 of recording mechanism unit 1 is rotatably joined with a housing 24 of the control unit 2 via the hinge portion 3 provided on both sides thereof, in which both housings 17 and 24 are held flat in the non-service state as shown in Fig. 9. Further, the power source unit 8 is used as an adaptor for supplying a power to the whole apparatus, as well as driving the recording mechanism unit 1, and for example, Ni-Cd battery is stored in this embodiment, but it will be appreciated that the power source unit may be in the form of containing a power source such as dry battery or transformer inside. As shown in Fig. 9B , by engaging interlock portions 6, 6 provided on the side face of a housing 9 for the power source unit 8 into locking portions 5, 5 provided on the side face of the housing for the recording mechanism unit 1 and the control unit 2 in a direction of arrow A as indicated in Fig. 9A , the recording apparatus can be made in a convenient state for the transportation, and maintained in a compact and integral form with the relative displacement between the recording mechanism unit 1 and the control unit 2 constrained. Referring now to Figs. 10A and 10B, the recording apparatus in the service state will be described below. To put the apparatus to the service state, the power source unit 8 is once removed from the side face of each housing for the recording mechanism unit 1 and the control unit 2, as shown in Fig. 9B , and the recording mechanism unit 1 is stood by rotation via the hinge portion 3 so that the apparatus is placed in a state as shown in Fig. 10A . Thereafter, the power source unit 8 is inserted under the recording mechanism unit 1 stood up, as shown in Fig. 10B, and the interlock portions 6, 6 on the side of the power source unit 8 are engaged with locking portions 7, 7 exposed on the rear face side beneath the housing 17 of the control unit 2, as shown in Fig. 10A, whereby the apparatus can be placed in a suitable attitude for the service as a whole. In these figures of Figs. 9A, 9B , 10A and 10B , 25 is a tray for accepting exhausted sheets drawn out from the front face of the control unit 2, 23 is a panel switch provided at the side portion on the upper face of the control unit 2 so as not to obstruct the way of the exhausted sheet, 10 is a sheet insertion opening with a receiving plate 15 which is provided on the rear face side of the recording mechanism unit 1, and 22 is an I/F (interface) connector and its DIP switch provided at the lower portion on the rear face of the recording mechanism unit 1. The electrical connection between the control unit 2 and the power source unit 8 in the recording apparatus assembled in the service state is made via connector (not shown) to be connected simultaneously upon the connection of both portions, or a cord prepared separately, while the electrical connection between the control unit 2 and the recording mechanism unit 1 is performed by a freely bendable flexible cable not shown which is provided at a connecting portion of the hinge portion 3 for both portions. In the recording apparatus reassembled into the service state, a sheet 4 is inserted through an insertion opening 10 on the rear face side, the recorded sheet 4 is exhausted from an exhausting portion 29 on the front side of the recording mechanism unit 1 on to the upper face of the control unit housing 24, as shown in Fig. 10A , and received into the exhausted sheet receiving tray 25. A further provision of the U-shaped conveying passage as described in the second embodiment is more preferable because the excess space on the rear face is eliminated. Fig. 11 shows the constitution of a recording apparatus, in cross section, according to a fourth embodiment of the present invention, in which the power source unit 8 is indicated by the two-dot chain line. In the recording mechanism unit 1, 13 is a feed roller, 16 is a pinch roller contact and cooperative with the feed roller 13 in feeding the sheet, 12 is a plate-like platen for holding the recording sheet 4 fed to the recording position, 11 is a recording head (a unit of ink jet recording heads integral with an ink tank in this embodiment) for recording by scanning along the recording sheet 4 held on the platen 12, and 14 is a guide shaft for guiding the movement of the recording head 11 in a direction perpendicular to the paper face. Also, 21 is a control substrate provided within the housing 24 of the control unit 2, on which substrate there are disposed driving portions provided within the recording mechanism unit 1, and circuits (not shown) for supplying a signal to the recording head 11, whereby a variety of signals input via the panel switch 23 are supplied to the recording mechanism unit 1. Fig. 12 shows the outline of a fifth embodiment of the present invention. This embodiment is configured such that the power source unit 8 is longitudinally inserted under the frame portion 17 of the recording mechanism unit 1 in a sheet feeding direction with the constitution as shown in Fig. 9. To achieve the engaged state between the power source unit 8 and the control unit 2, not shown in the figure, engagement means (comprised of 5, 5 and 6, 6) as shown in Fig. 9B may be provided on the joining face of both. In this way, the recording apparatus capable of changing the attitude can be set more stably in forward and backward directions, and can secure a space irrelevant to the joining with the power source unit 8 on the rear face side of the control unit housing 24, so that it is possible to provide an operation unit such as an I/F connector, as well as a DIP switch or a reset switch. And at the non-service time, the operation unit is covered with the recording mechanism unit 1 to be surely protected. Fig. 13 shows a sixth embodiment of the present invention. In this embodiment, the power source unit 8 is mountable on the side face of the control unit housing 24, and slidable along a guide portion for the slide provided on the side face of the control unit housing 24 in a direction of arrow B as shown in Fig. 13B . Also, in this embodiment, the housing 24 of the control unit 2 and the housing 9 of the power source unit 8 are formed in the same shape of upper and lower cross sections including the sheet feeding direction in a stored state for transportation as shown in Fig. 13A , whereby only when the recording mechanism unit 1 is stood and placed in the service state as shown in Fig. 13B , the power source unit 8 can be slid in the direction of arrow B, so that the recording mechanism unit 1 can be held in a state supported by the power source unit 8. Note that in this case, the DIP switch can be held in a connectable and exposed state on the side face of the control unit housing 24, as shown in Fig. 13B. While in the sixth embodiment as above described, the power source unit 8 is slidable with respect to the control unit 2, it is possible that after the recording apparatus 1 is changed from the flat state as shown in Fig. 13A to the standing state as shown in Fig. 13B , the power source unit 8 may be rotated in a horizontal direction around the longitudinal axis not shown, and received under the bottom face of the recording mechanism unit housing 17, or the power source unit may be in a detachable form as in the seventh embodiment. Fig. 14 shows the outline of a seventh embodiment of the present invention. The seventh embodiment is one in which the power source unit 8 contains a signal line 30 for supplying an electric signal from the control unit 2 to the recording mechanism unit 1, and when the apparatus is transformed into the service state, the control unit 2 and the recording mechanism unit 1 are electrically connected via the signal line 30 provided on the power source unit 8, as shown in Figs. 14A and 14B. Thereby, there is no need for the flexible cable provided on a bendable portion between the control unit 2 and the recording mechanism unit 1. While in the above-described embodiment, the present invention is applied to an ink jet recording apparatus, the present invention is also applicable to a variety of recording apparatuses such as a wire dot recording apparatus, a laser beam recording apparatus, a thermal transfer recording apparatus, or a thermal recording apparatus, without regard to recording method of recording means (recording head), to the same effect. While in the above-described embodiments a serial type recording apparatus making the scanning along the recording sheet with the recording means (recording head) 11 mounted on the carriage or as the recording means itself was exemplified, the present invention is also applicable to a line type recording apparatus using line type recording means corresponding to the whole or a part of the recording width for the recording sheet to the same effect. Further, the present invention is also applicable to a variety of recording apparatuses such as monochrome recording apparatus using a single recording head, a color recording apparatus using a plurality of recording means for recording with different colors, or a recording apparatus for the gradation recording using a plurality of recording means for recording at different densities of the same color, whereby the same effects can be accomplished. Further, the present invention is also applicable in any form of recording means (recording head), such as a cartridge type having a recording head and an ink tank integrally formed, and a type having a recording head and an ink tank separately provided and connected via an ink supply tube, irrespective of the constitution between the recording means and the ink tank, whereby the same effect can be accomplished. When the present invention is applied to an ink jet recording apparatus, it can be applied to those using recording means (recording head) with electricity-heat converters such as piezoelectric elements, among which an ink jet recording apparatus using recording means relying on the method of discharging the ink by the use of the heat energy can achieve the excellent effects. With such a method, the higher density and definition of recording can be accomplished. It is preferable to employ the typical structure and the principle of structures disclosed in, for example, U.S.P. No. 4,723,129 and U.S.P. No. 4,740,796. This system can be adopted in a so-called "On-Demand" type and "Continuous" type structures. In particular, the "On-Demand" type is more preferable, because an electrothermal conversion member disposed to align to a sheet or a liquid passage in which liquid (ink) is held is supplied with at least one drive signal which corresponds to information to be recorded and which enables the temperature of the electrothermal conversion member to be raised higher than a nuclear boiling point, so that thermal energy is generated in the electrothermal conversion member and film boiling is caused to take place on the surface of the recording head which is heated. As a result, bubbles can be respectively formed in liquid (ink) in response to the drive signals. Due to the enlargement and contraction of the bubble, liquid (ink) is discharged through the discharge port, so that at least one droplet is formed. In a case where the aforesaid drive signal is made to be a pulse signal, a further satisfactory effect can be obtained in that the bubble can immediately and properly be enlarged/contracted and liquid (ink) can be discharged while exhibiting excellent responsibility. It is preferable to employ a drive signal of the pulse signal type disclosed in U.S.P. No. 4,463,359 and U.S.P. No. 4,345,262. Furthermore, in a case where conditions for determining the temperature rise ratio on the aforesaid heated surface disclosed in U.S.P. No. 4,313,124 are adopted, a further excellent recording operation can be performed. In addition to the structure (a linear liquid passage or a perpendicular liquid passage) of the recording head formed by combining the discharge ports, the liquid passage and the electrothermal conversion member as disclosed in the aforesaid specifications, a structure disclosed in U.S.P. No. 4,558,333 and U.S.P. No. 4,459,600 in which the heated portion is disposed in a bent portion is included in the scope of the present invention. Furthermore, the present invention can effectively be embodied in a structure in which a common slit is made to be the discharge portion of a plurality of electrothermal conversion members and which is disclosed in Japanese Patent Appln. Laid-Open No. 59-123670 and a structure in which an opening for absorbing thermal energy pressure wave is formed to align to the discharge port and which is disclosed in Japanese Patent Appln. Laid-Open No. 59-138461. That is, the present invention can ensure an efficient recording in whatever form the recording head may be. A full line type recording head having a length which corresponds to the width of the maximum recording medium which can be recorded by the recording apparatus may be a structure capable of realizing the aforesaid length and formed by combining a plurality of recording heads as disclosed in the aforesaid specifications or a structure formed by an integrally formed recording head. The present invention will enable the aforesaid effects to be exhibited further effectively. In addition, the present invention can also be effectively adapted to a structure having an interchangeable chip type recording head which can be electrically connected to the body of the apparatus or to which ink can be supplied from the body of the apparatus when it is mounted on the body of the apparatus or a cartridge type recording head integrally formed to the recording head. Also, addition of a restoration means for the recording means, a preliminary auxiliary means, etc. provided as the constitution of the recording device is preferable because the effects of the present invention can be further stabilized. Specific examples of these may include, for the recording head, capping means, cleaning means, pressurization or suction means, electricity-heat converters or another type of heating elements, or preliminary heating means according to a combination of these, and it is also effective for performing stable recording to perform preliminary mode which performs discharging separate from recording. Further, as the type of the recording head to be mounted and the number of heads, the present invention is effective to either a single recording head provided corresponding to a monochrome ink or a plurality of recording heads provided corresponding to a plurality of inks having different recording colors or densities. That is, as the recording mode of the ink jet recording device, the present invention is extremely effective for not only the recording head only of a primary color such as black, etc., but also a device equipped with at least one of plural different colors or full color by color mixing, whether the recording head may be either integrally constituted or combined in plural number. Though the ink is considered as the liquid in the embodiments of the present invention as above described, the present invention is applicable to either of the ink solid below room temperature, and softening or liquefying at or above room temperature, and the ink liquefying when a recording enable signal is issued as it is common with the ink jet recording device to control the viscosity of ink to be maintained within a certain range of the stable discharge by adjusting the temperature of ink in a range from 30 to 70°C. In addition, in order to avoid the temperature elevation due to the heat energy by positively utilizing the heat energy for the change of state from solid to liquid, or to prevent the ink from evaporating by the use of the ink stiffening in the shelf state, the ink having a property of liquefying only with the application of heat energy, such as the ink liquefying with the application of heat energy in accordance with a recording signal so that liquid ink is discharged, or the ink already solidifying upon reaching a recording medium, is also applicable in the present invention. In this case, the ink may be in the form of being held in recesses or through holes of porous sheet as liquid or solid matter, and opposed to electricity-heat converters, as described in Japanese Patent Application Laid-Open No. 54-56847 or Japanese Patent Application Laid-Open No. 60-71260. The most effective method for inks as above described in the present invention is based on the film boiling. In addition, the ink jet recording apparatus according to the present invention may be used in the form of an image output terminal of the information processing equipment such as a computer, a copying machine in combination with a reader, or a facsimile apparatus having the transmission and reception feature. As above detailed, it is possible to provide a highly reliable recording apparatus excellent in handling, by taking an appropriate form of the apparatus depending on whether the recording apparatus is used or not.

Claims: An ink jet recording apparatus for recording by discharging ink onto a recording medium said apparatus comprising: a first housing (1) having a feed mechanism (13) for feeding a recording medium (4); and a second housing having a control unit (2) for controlling a recording mechanism, said second housing being connected to said first housing (1) and movable with respect to said first housing (1) between a standby position where an I-shaped contour is formed by said first (1) and second housings and a recording position where an L-shaped contour is formed by said first (1) and second housings, wherein said first housing (1) is arranged to house an ink jet recording head (11) for discharging ink onto the recording medium (4) and an ink containing member (53) for containing ink to be supplied to said ink jet recording head (11) and defines an ink jet recording area at which recording is performed by said ink jet recording head (11), and in that said first (1) and second housings define, in said recording position, a recording medium conveyance route between an upper outer surface of said second housing and the ink jet recording area of said first housing (1). An ink jet recording apparatus in accordance with claim 1 wherein said second housing is rotatable with respect to said first housing (1). An ink jet recording apparatus in accordance with claim 1 or claim 2, wherein said upper outer surface of said second housing is arranged to act as a paper exhaust tray. An ink jet recording apparatus in accordance with claim 1 or claim 2 wherein said upper outer surface of said second housing is arranged to act as a paper supply tray. An ink jet recording apparatus according to any of the preceding claims wherein said feed mechanism (13) is adapted to convey a recording medium (4) along a U-shaped conveyance route. An ink jet recording apparatus according to any of claims 1 to 4 wherein said feeding mechanism (13) is adapted to convey a recording medium (4) along a conveyance route that passes from one side to an opposite side of said first housing (1). An ink jet recording apparatus according to any of the preceding claims, wherein at least one of an interface connector (22), a power source connector (26) and a dip switch for the setting of apparatus functions (27) is provided at a position which is covered by said first housing (1) when said recording apparatus is in said standby position and is exposed when said recording apparatus is in said recording position. An ink jet recording apparatus in accordance with any of the preceding claims, further comprising a separably mountable power source (8) mountable on said ink jet recording apparatus in different positions when said ink jet recording apparatus is in said standby position and when said ink jet recording apparatus is in said recording position. An ink jet recording apparatus in accordance with claim 8 wherein said power source unit (8) has a connecting mechanism for effecting electrical connection between said first housing (1) and said second housing. An ink jet recording apparatus in accordance with any of the preceding claims wherein said recording mechanism has an ink jet recording head (11) for recording onto said recording medium (4) by the discharge of ink. A recording apparatus in accordance with claim 10 wherein said ink jet recording head (11) is adapted to record by energising electrothermal converters in response to a recording signal to cause film boiling, thereby discharging ink. An ink jet recording apparatus in accordance with claim 10 or 11, wherein said ink jet recording head (11) contains ink for use in recording.

Inventors: ASANO JUNICHI, HASHIMOTO KENICHIRO, ASANO, JUNICHI, HASHIMOTO, KENICHIRO, ASANO, JUNICHI, C/O CANON KABUSHIKI KAISHA, HASHIMOTO, KENICHIRO, C/O CANON KABUSHIKI KAISHA
Applicants: CANON KK, CANON KABUSHIKI KAISHA
Application year: 1992
Main classification: B41J11
IPC codes: B41J3