JP2005161764A - Circuit board and inkjet recording device using the circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an ink from causing a shortcircuit between conductor-exposed portions and a malfunction due to the shortcircuit without causing the enlargement of a device and cost increases even if an ink adheres to the conductor-exposed portions of a circuit board due to an ink mist floating in a recording device. <P>SOLUTION: A through hole 706 passing through the front and rear of the circuit board is provided between the facing conductor-exposed portions of a plurality of conductor-exposed portions 705a to 705d provided in the circuit board to connect a plurality of terminals 704a to 704d of a control element 704 to the circuit board 703. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a circuit board used in an ink jet recording apparatus that performs recording by discharging ink from a recording means onto a recording medium, and an ink jet recording apparatus including the circuit board.

  As one form of a recording apparatus having a function of a printer, a facsimile, a copying machine, or the like, an ink jet recording apparatus that performs recording by discharging ink from a recording head as a recording unit to a recording medium such as a recording sheet is widely used. This ink jet recording apparatus forms an image by landing ink droplets flying from fine discharge ports on the surface of a recording medium. Such an ink jet recording apparatus has image quality similar to that of plain paper, coated paper having an ink receiving layer on the surface, glossy paper having an ink receiving layer on a thick paper, postcard paper, and silver halide photography. It is possible to record (print) on various recording media such as photographic paper, and in recent years, especially in fields such as the use as an inkjet New Year's postcard and the use of printing digital camera images directly on photographic paper. Demand is increasing.

  Ink jet recording apparatuses tend to reduce the size of ink droplets discharged year by year in order to enable high-definition image recording such as photographs. The ink droplets ejected from the recording head fly in the air and land on the recording medium to form an image. At the same time, very small ink droplets floating in the air without reaching the recording medium are formed. Occur. A mist-like ink composed of such minute ink droplets is referred to as an ink mist. In addition, in the ink jet recording apparatus, as one processing operation for maintaining and recovering the ink discharge performance of the recording head, ink is supplied at a predetermined timing toward an ink receiving portion (preliminary discharge ink receiving portion) disposed in the apparatus main body. In this case, since the distance to the ink receiving portion is longer than the distance to the recording medium, a considerable amount of ink mist is generated by this preliminary ejection.

  Ink mist floating in the recording apparatus may be discharged from the opening of the apparatus to the outside of the apparatus, but most of the ink mist adheres to the inside of the recording apparatus. The ink mist is a very small ink droplet, but if it is attached in large quantities, it causes various obstacles to the operation of the recording apparatus. In particular, when a large amount adheres to an electric circuit board as a control means, there is a case where the electric circuit is short-circuited between adjacent conductor exposed portions on the circuit board, causing a malfunction of the recording apparatus. Circuit boards as control means of the ink jet recording apparatus include a main board on which an arithmetic element is mounted and a small board made up of a panel board for arranging switches, sensors, motors, etc. in the recording apparatus. A lot of small substrates are arranged with downsizing, high functionality and operability improvement of the apparatus.

  In a recording apparatus, a panel board as a circuit board on which a switch element for a user to perform operations such as turning on / off the power, canceling an error, and setting a print mode is often arranged at the upper center of the apparatus main body. . FIG. 10 is a schematic exploded perspective view for illustrating an example of the arrangement state of the panel substrate in the ink jet recording apparatus. Also in the ink jet recording apparatus of FIG. 10, the panel substrate 703 as a circuit board is disposed at the upper center of the apparatus main body, and an upper case 801 as an exterior member is attached to the upper side of the panel substrate 703. In the ink jet recording apparatus of FIG. 10, the panel substrate 703 on which the LCD 26 and the like are mounted is attached to the upper center of the chassis 701 via the LCD spacer 100.

Many ink jet recording apparatuses perform recording with an ink tank cartridge mounted on a recording head, and a user replaces the ink tank cartridge when the ink is used up. In such a recording apparatus, in order to facilitate the replacement of the ink tank cartridge, the recording head is arranged above the front surface of the recording apparatus, and the user can replace the ink tank cartridge from the front or above the recording apparatus. Has been. Therefore, in the ink jet recording apparatus, the panel substrate 703 (FIG. 10) disposed at the upper center of the apparatus main body is disposed in the vicinity of the recording head inside the apparatus main body. Therefore, the panel substrate 703 is often arranged at a position where a large amount of ink mist easily adheres, and there is a disadvantage that the ink mist is likely to adhere and cause a malfunction.
Japanese Patent Laid-Open No. 10-006612

  However, if a cover member is provided to prevent ink mist from adhering, or if the distance between exposed conductors on the circuit board is widened, the device may be enlarged, or the circuit board may be enlarged, resulting in an increase in cost. there were. The present invention has been made in view of such a technical problem, and an object of the present invention is to cause a circuit board due to ink mist generated in a recording apparatus without causing an increase in size and cost of the apparatus. The present invention provides a circuit board capable of preventing a short circuit between conductor exposed portions due to ink mist and malfunction caused by the short circuit, and an ink jet recording apparatus using the circuit board.

  In order to achieve the above object, the present invention provides a circuit board used in an ink jet recording apparatus that performs recording by discharging ink from a recording means to a recording medium, and a control element is mounted via a plurality of conductor exposed portions, A through hole is formed between adjacent conductor exposed portions in the control element.

  According to another aspect of the present invention, there is provided an inkjet recording apparatus comprising: a recording unit that performs recording by ejecting ink onto a recording medium; and a circuit board as a control unit. Is mounted via a plurality of exposed conductors, and a through hole is formed in the portion of the circuit board between adjacent exposed conductors in the control element.

  According to the present invention, even when the ink mist floating in the recording apparatus adheres as an ink drop to the conductor exposed portion of the circuit board without causing an increase in size and cost of the apparatus, other conductors adjacent to each other through the through hole. Provided are a circuit board that can divide ink from an exposed portion, thereby preventing a short circuit between conductor exposed portions due to ink mist and malfunction caused by the short, and an ink jet recording apparatus using the circuit substrate. The

  Embodiments of the present invention will be specifically described below with reference to the drawings. Note that the same reference numerals denote the same or corresponding parts throughout the drawings. In addition, here, a case where the recording medium is mainly a recording sheet (paper or the like) will be described as an example. However, the present invention can be used as a recording medium such as a plastic sheet, cloth, earthenware, or metal. Widely applicable. FIG. 1 is a schematic perspective view showing a schematic configuration other than the exterior of an ink jet recording apparatus to which a circuit board to which the present invention is applied is mounted.

  In FIG. 1, the ink jet recording apparatus according to the present embodiment includes an automatic paper feeding mechanism 100 that automatically feeds recording paper as a recording medium (not shown) into the apparatus main body, and one sheet each from the automatic paper feeding mechanism 100. A transport mechanism 200 that transports (feeds) recording paper to be fed through the recording area and sends it out of the apparatus main body, a discharge mechanism 300 that is located downstream of the transport mechanism 200 in the transport direction, and a recording that is transported through the recording area. A recording mechanism 400 that performs recording based on recording data on a sheet (recording sheet), and a recovery mechanism 600 that maintains and recovers the ink ejection performance of the recording head 501 as a recording unit of the recording mechanism 400 are provided.

  Each of these mechanism portions is configured substantially integrally with a chassis 701 of the apparatus main body as a center, and performs an image forming operation by being driven in cooperation by a control means including a circuit board or the like. The conveyance direction of the recording paper is the direction of arrow A in FIG. 1, and the carriage 401 on which the recording head 501 is mounted is guided and supported so as to be reciprocally movable in the direction of the double arrow B along the guide shaft 402 and the guide rail 305. On the carriage 401, a cartridge type ink tank that can be attached to and detached from the recording head 501 is mounted. The ink tank according to the present embodiment includes a black ink tank cartridge 503 and a color ink tank cartridge 504 integrated with three colors of cyan, magenta, and yellow. In the recording apparatus shown in FIG. 1, a panel substrate 703 is arranged in a substantially horizontal orientation at the center upper portion of the apparatus main body.

  A recording head 501 as a recording unit is an ink jet recording head that records each color ink supplied from each ink tank 503, 504 from each ejection port (ejection port array) of a predetermined color according to recording information. On the ejection port surface (ejection port arrangement surface) 501a of the recording head 501, 1280 ejection ports are arranged for each ink color, for example, at a density of 1200 dpi (dot / inch) in the sub-scanning direction. In addition, in the ink flow path (liquid path) communicating with each discharge port, an electrothermal converter for locally heating the ink to cause film boiling and discharging the ink by the pressure is provided. Yes.

  That is, the recording head 5 as the recording means is an ink jet recording means including an electrothermal converter that generates thermal energy used for ejecting ink, and the thermal energy applied by the electrothermal converter. Thus, bubbles are generated by film boiling generated in the ink, and the ink is discharged from the discharge port using the pressure (energy) generated by the foaming. Of course, in carrying out the present invention, an ink jet recording head of another system such as a system that includes an electromechanical transducer and ejects ink by mechanical energy such as vibration energy may be used.

  FIG. 2 is a schematic perspective view showing a lower case portion excluding the internal mechanisms from the ink jet recording apparatus of FIG. 2, a main control board (main circuit board) 702 as a control means is mounted on the inner surface of the lower case 802 of the ink jet recording apparatus of FIG. Various control elements such as switch elements provided on the panel board 703 in FIG. 1, and switches, sensors, motors, etc. provided in other recording operation mechanisms are connected to the main control board 702 by electric wiring (not shown). The control signal is transmitted through the electrical wiring.

  3 is a schematic front view showing a state during recording (printing) of the recording mechanism (recording operation unit) 400 of the ink jet recording apparatus to which the circuit board to which the present invention is applied is mounted, as viewed from the front of the apparatus. FIG. 4 is a schematic front view showing a state of preliminary ejection of the recording mechanism 400 of FIG. 3 as viewed from the front of the apparatus. 3 and 4, the carriage 401 is supported so as to be reciprocally movable along a guide shaft 402 installed in the apparatus main body, and the recording head 501 mounted on the carriage 401 can be moved once (scanned). Recording for one line (one band) is performed. That is, during one scan of the carriage 401, ink is ejected from the ejection ports (ejection port array) formed on the ejection port surface (ejection port arrangement surface) 501a of the recording head 501 based on the recording data. Thus, image recording for one line having a width corresponding to the length of the discharge port array on the discharge port surface 501a is performed on the recording paper P held on the platen 203.

  When the recording for one line is completed, the recording paper P is fed by a predetermined pitch by the rotation of the transport roller 201 (FIG. 1), and then the next line image is recorded by scanning the carriage 401 again. By repeating such a recording operation, recording (image formation) is performed on the entire recording paper P. In this recording operation, the ink droplets ejected from each ejection port of the recording head 501 are as small as several picoliters, and these ink droplets fly through the gap between the ejection port surface 501a and the recording paper P to perform the recording. An image is formed by landing on the paper. At the same time, in addition to the main ink droplets (referred to as main droplets), very small secondary ink droplets (referred to as ink mist) are generated. The ink mist does not reach the recording paper P, floats in the air, and becomes mist-like.

  During recording, as shown in FIG. 3, the ink mist is generated in the gap between the recording head 501 and the recording paper P. However, when the carriage 401 scans (moves) in the direction of arrow B in the drawing, Since a space is opened upward, the ink mist rises as shown by an arrow and spreads over the entire travel space of the carriage 401. The ink mist spread in this way is further diffused into the recording apparatus by the airflow generated by the movement of the carriage 401.

  In the ink jet recording apparatus according to the present embodiment, ink discharge (preliminary discharge) is performed at a predetermined timing toward the preliminary discharge ink receiving portion 601 provided in the recovery mechanism (recovery unit) 600 as shown in FIG. Is called. In this case, the distance from the recording head 501 (discharge port surface 501a) to the ink receiving portion 601 is set larger than the distance from the recording head to the recording medium P. Accordingly, in the preliminary ejection, in addition to the ink droplets (main droplets) reaching the ink receiving portion 601, the same as the ink mist generated during the recording, but not reaching the ink receiving portion 601 and in the air. A considerable amount of ink mist floating on the surface is generated.

  Also in this preliminary discharge, ink mist is generated in the gap between the recording head 501 and the preliminary discharge ink receiving portion 601. However, when the preliminary discharge operation is finished and the carriage 401 is moved for the recording operation or the like, Therefore, the ink mist also rises as shown by an arrow in FIG. 4 and spreads over the entire travel space of the carriage 401. The ink mist spread in this way is further diffused into the recording apparatus by the airflow generated by the movement of the carriage 401.

  A part of the ink mist generated by the recording operation and the preliminary discharge as described above is discharged out of the apparatus from the recording paper discharge port, the opening of the apparatus, and the like by an air flow generated by the movement of the carriage 401. However, most of the generated ink mist floats in the recording apparatus and gradually descends to guide shaft 402, platen 203, main substrate 702 (FIG. 2), and panel substrate 703 (FIGS. 1, 3, and 4). It adheres to each location in the recording apparatus, such as a circuit board (control board) shown in FIG. At that time, since the ink mist falls due to the influence of gravity, there is a tendency that a lot of ink mist adheres to a portion forming a horizontal plane in the recording apparatus. Circuit boards such as a main board 702 and a panel board 703 as control means mounted in the recording apparatus are generally arranged in a horizontal direction, and are typical members having a portion that forms the horizontal plane to which ink mist is likely to adhere. (Parts).

  FIG. 5 is a schematic plan view showing a configuration of a panel substrate 703 as a circuit substrate according to the first embodiment of the ink jet recording apparatus to which the present invention is applied, and FIG. 6 is a panel taken along line 6-6 in FIG. It is a typical longitudinal cross-sectional view which shows the structure of the board | substrate 703 and its vicinity. 5 and 6, at least one control element 704 is mounted on a panel substrate 703 which is one of control means by soldering or the like. The control element 704 in the present embodiment is composed of a switch element for turning on / off the power, canceling an error, setting a print mode, or the like by a user operation, for example. A total of four terminals 704 a, 704 b, 704 c, and 704 d are provided on each side of the switch element 704.

  A plurality (four) of conductor exposed portions 705a, 705b, 705c, and 705d are provided on the upper surface of the panel substrate 703 as a circuit board corresponding to each of the plurality of terminals 704a to 704d of the switch element 704. The switch element 704 as the control element is mounted by fixing the terminals 704a to 74d to the corresponding conductor exposed portions 705a to 705d by soldering or the like. Therefore, between the adjacent conductor exposed portions, that is, in this embodiment, between the exposed conductor portions 705a and 705b on the left side of the drawing and between the exposed conductor portions 705c and 705d on the right side of the drawing, the panel substrate 703 is turned upside down. A through hole 706 penetrating in the direction is formed.

  FIG. 11 is a schematic plan view showing a configuration when the through hole 706 is not provided in the panel substrate shown in FIGS. 5 and 6. The panel substrate shown in FIG. 11 is different from the configuration of FIGS. 5 and 6 only in that it does not have the through hole 706, and has substantially the same configuration in other points, and the corresponding parts are the same. These are indicated by reference numerals, and detailed descriptions thereof are omitted. Therefore, the operation and effect of the circuit board (panel substrate) 703 according to the present embodiment shown in FIGS. 5 and 6 will be described below in comparison with the configuration of FIG.

  When recording (printing) is performed by the ink jet recording apparatus, ink mist generated when ink is ejected from the recording head 501 adheres to the panel substrate 703 which is a substantially horizontal plane. Individual ink mists are very small ink droplets, but if a large number of high-definition photographs are printed, a large amount of ink mist accumulates on the panel substrate 703 and eventually adheres as continuous ink droplets M. To do. In the panel substrate 703 having no through-hole 706 in FIG. 11, between the left terminals 704a and 704b of the switch element 704 (thus, between the left conductor exposed portions 705a and 705b) or the right terminal 704c. When the ink droplet M adheres between the 704d (and therefore between the left conductor exposed portions 705c and 705d), an electrical short circuit occurs between the terminals (or between the conductor exposed portions) due to the ink droplet. To do. Therefore, although the switch element 704 is not pressed, an electric signal in a pressed state is transmitted, and the device may malfunction.

  On the other hand, in the circuit board (panel board) 703 of the ink jet recording apparatus according to this embodiment shown in FIGS. 5 and 6, the left conductor exposed between the terminals 704 a and 704 b on the left side of the switch element 704. Portion 705a and 705b) or between the right terminals 704c and 704d (thus, between the left conductor exposed portions 705c and 705d), these terminals (conductor exposed) Since the through-holes 706 that pass through the circuit board 703 in the front and back direction are provided between the two portions), the attached ink droplet M is completely divided by the through-holes. Therefore, there is no short circuit between the terminals of the switch element 704 (or between exposed conductors).

  In that case, in the configuration as shown in FIG. 5, the case where there is a possibility of short-circuiting with the smallest number of ink droplets M is the shortest distance portion connecting the adjacent (opposing) conductor exposed portions 705a and 705b with a straight line. is there. Therefore, in order to reliably prevent a short circuit due to the ink droplet M, the through hole 706 is preferably formed to extend longer than at least one of the adjacent conductor exposed portions 705a and 705b. Note that in the conductor exposed portions (or terminals) that are adjacently disposed (opposed) with the through hole 706 interposed therebetween, even when more ink mist adheres by taking as long a distance as possible to bypass the through hole 706. Since the possibility of a short circuit (short circuit) between the conductor exposed portions (or between terminals) can be further reduced, the through hole 706 is preferably extended as long as possible.

  In FIG. 6, a switch element 704 as a control element is in contact with a circuit board (panel board) 703 as a control means at the center of the bottom surface. When the user presses the panel key 803 attached to the upper case 801 of the recording apparatus main body, the central button portion 704e of the switch element 704 is pressed by the panel key 803, and an electrical signal is generated. The pressing force in this case is supported (held) by the contact portion of the panel substrate 703 via the bottom surface of the switch element 704, that is, the control element holding member (switch element holding member) 703a.

  That is, since the switch pressing force is reliably supported by the circuit board 703 mounted on the chassis 701, the terminals 704a to 704d of the switch element 704 itself, the conductor exposed portions 705a to 705d themselves, and the terminals 704a to 704d No stress is applied to the soldering portion between the conductor exposed portions 705a to 705d. Therefore, it is possible to prevent the switch element mounting portion from being deformed or broken due to repeated operation or shocking operation of the switch element 704. In this embodiment, the switch element 704 is in contact with the panel substrate 703 at the bottom of the center part. However, if the switch element 704 is arranged to receive the pressing force evenly, the contact part is not necessarily in the center. It does not have to be a part.

  FIG. 7 is a schematic longitudinal sectional view showing the configuration of the circuit board according to the second embodiment of the ink jet recording apparatus to which the present invention is applied and the vicinity thereof. In FIG. 7, in the panel substrate 703 as a circuit board according to the present embodiment, the bottom surface of the switch element 704 that is one of the control elements (in the illustrated example, most of the region including the central portion thereof) is provided in the chassis 701. It is in contact with the projected portion 701a. The protrusion 701a constitutes a control element (switch element) holding member. Although the present embodiment is different from the first embodiment in this point, it has substantially the same configuration in other points, and corresponding parts are denoted by the same reference numerals. Therefore, this second embodiment can provide the same effects as those of the first embodiment.

  In the second embodiment, as described above, the switch element 704 is held and fixed by using a part 701a of the chassis 701 as a control element (switch element) holding member. Therefore, as in the case of the first embodiment, the switch element 704 can be held and fixed with high rigidity and high accuracy, and dimensional variations in the relative positions of the switch element 704 and the upper case 801 and the panel key 803 in a switch pressing operation or the like. And the reliability and operation feeling of the panel key 803 can be improved.

  FIG. 8 is a schematic plan view showing the configuration of a circuit board according to Embodiment 3 of the ink jet recording apparatus to which the present invention is applied. FIG. 9 is a schematic view of the circuit board and its vicinity along line 9-9 in FIG. It is a typical longitudinal cross-sectional view which shows a structure. 8 and 9, a panel substrate 703 as a circuit board according to the present embodiment is arranged so as to protrude in a horizontal direction substantially perpendicular to the chassis 701 of the recording apparatus, and is provided as a control element on the lower surface thereof. The switch element 704 is mounted. The switch element 704 is provided with a plurality (four) of terminals 704a, 704b, 704c, and 704d extending in the upward direction, and a conductor exposed portion 705a corresponding to each of the terminals 704a to 704d on the upper surface of the panel substrate 703. ˜705d. The terminals 704a to 704d are electrically connected to the corresponding conductor exposed portions 705a to 705d by soldering or the like. A through hole 706 penetrating the back and front of the panel substrate 703 is formed at a position extending long between the conductor exposed portions 705a and 705b and the conductor exposed portions 705c and 705d.

  According to such a configuration, even when a large amount of ink mist accumulates on the panel substrate 703 and eventually adheres as a continuous ink droplet M, the ink droplet is divided by the through-hole 706. As in the case of, a short circuit between the terminals of the switch element 704 (or between exposed conductors) can be prevented. Also in this case, the case where there is a possibility of short-circuiting with the smallest number of ink droplets M is the shortest distance portion connecting the exposed conductor portions with a straight line. Therefore, in order to surely prevent the short-circuit, the through hole 706 is used. It is preferable to select a length that completely covers and shields between exposed conductors. In addition, even when more ink mist adheres, when it is required to further reduce the possibility of short-circuiting between exposed conductors (or between terminals), the distance of the path around the through hole 706 is reduced. It is preferable to extend the through hole 706 as long as possible so as to be as long as possible.

  In FIG. 9, the chassis 701 is in contact with the surface (the left surface in the drawing) opposite to the surface (the right surface in the drawing) on which the button portion 704e of the switch element 704 is provided. The contact portion 701b of the chassis 701 functions as a control element (switch element) holding member. That is, the button portion 704e of the switch element 704 is pressed by the user from the lateral direction (from the right side in the figure) via a panel key (not shown), and an electric signal is generated. It is held (supported) by a part (support part) 701b of the chassis 701 through the left surface). Accordingly, even when the switch is operated, an external force does not act on the soldering portion between the terminals 704a to 704d of the switch element 704 and the conductor exposed portions 705a to 705d. Therefore, even when the switching element 704 is repeatedly operated, the switching element mounting portion can be prevented from being broken. Further, since the switch element 704 is highly rigid and accurately positioned and held by the chassis 701, variation in relative position between the upper case and the panel key (not shown) can be suppressed, and the reliability and operational feeling of the panel key can be suppressed. Can be further improved.

  The third embodiment of FIGS. 8 and 9 has substantially the same configuration as that of the first embodiment or the second embodiment except for the points described above. Detailed description is omitted. Therefore, this third embodiment can provide substantially the same operational effects as those of the first or second embodiment.

  According to the embodiment described above, even if a large amount of ink mist floating in the recording apparatus adheres to the circuit board 703 and ink droplets M are generated, the through holes 706 allow the conductor exposed portions 705a to 705d to be connected. (Or between each of the terminals 704a to 70d of the control element 704), the ink can be divided, and therefore a short circuit due to ink mist between the exposed conductors (or between the terminals) can be reliably prevented. A high circuit board and an ink jet recording apparatus using the circuit board are provided.

  Further, according to the embodiment described above, since the control element (switch element) holding member that contacts the surface (bottom surface) opposite to the pressing operation surface (button part) 704e of the switch element 704 as the control element is provided. A highly reliable circuit board that can prevent external force (stress) from acting on the mounting portion of the control element 704 and can prevent deformation and destruction of the control element mounting portion with respect to repeated operations of the control element 704, and An ink jet recording apparatus using the circuit board is provided.

  In the above-described embodiments, the serial recording type inkjet recording apparatus that records while the recording unit (recording head) is moved relative to the recording medium has been described as an example. The present invention can be similarly applied to a line recording type ink jet recording apparatus that records only by sub-scanning using a line type recording head that covers the entire width or a part thereof, and can achieve the same effect. Is. The present invention also provides a gradation using a recording apparatus using one recording head, a color recording apparatus using a plurality of recording heads that record with different color inks, or a plurality of recording heads that record with the same color and different densities. The present invention can be similarly applied to a recording apparatus and further to a recording apparatus that combines these, and the same effect can be achieved.

  Furthermore, the present invention relates to a recording head including a configuration using a replaceable ink cartridge in which a recording head and an ink tank are integrated, a configuration in which the recording head and the ink tank are separated, and a connection between them using an ink supply tube or the like. The present invention can be similarly applied to any arrangement of the ink tank, and the same effect can be obtained. The present invention can also be applied to a case where the ink jet recording apparatus uses a recording means that uses an electromechanical transducer such as a piezo element. In particular, the ink is ejected using thermal energy. In the ink jet recording apparatus using the recording means of the above system, an excellent effect is brought about. This is because such a system can achieve higher recording density and higher definition.

1 is a schematic perspective view showing a schematic configuration other than an exterior of an ink jet recording apparatus to which a circuit board to which the present invention is applied is mounted. It is a typical perspective view which shows the part of a lower case except for each internal mechanism further from the inkjet recording device of FIG. FIG. 2 is a schematic front view showing a state in which the recording mechanism of the ink jet recording apparatus to which the circuit board to which the present invention is applied is mounted is viewed from the front of the apparatus. FIG. 4 is a schematic front view showing a state of preliminary ejection of the recording mechanism of FIG. 3 as viewed from the front of the apparatus. 1 is a schematic plan view showing a configuration of a circuit board according to Embodiment 1 of an inkjet recording apparatus to which the present invention is applied. FIG. 6 is a schematic longitudinal sectional view showing the configuration of the circuit board according to the first embodiment and the vicinity thereof, taken along line 6-6 in FIG. 5. It is a typical longitudinal cross-sectional view which shows the structure of the circuit board based on Example 2 of the inkjet recording device to which this invention is applied, and its vicinity. It is a typical top view which shows the structure of the circuit board based on Example 3 of the inkjet recording device to which this invention is applied. It is a typical longitudinal cross-sectional view which shows the structure of a circuit board and its vicinity along line 9-9 in FIG. It is a typical exploded perspective view for showing an example of an arrangement state of a panel substrate in an ink jet recording device. FIG. 7 is a schematic plan view showing a configuration when no through hole is provided in the circuit board shown in FIGS. 5 and 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Automatic paper feed mechanism 200 Conveyance mechanism 201 Conveyance roller 203 Platen 300 Discharge mechanism 305 Guide rail 400 Recording mechanism 401 Carriage 402 Guide shaft 501 Recording means (recording head)
501a Discharge port surface (discharge port arrangement surface)
503 Black ink tank cartridge 504 Color ink tank cartridge 600 Recovery mechanism 601 Predischarge ink receiving portion 701 Chassis 701a Protruding portion (control element holding member)
701b Support part (contact part, control element holding member)
702 Main control board (main circuit board)
703 Circuit board (panel board)
703a Control element holding member 704 Control element (switch element)
704a to 704d Terminal 704e Button part 705a to 705d Conductor exposed part 706 Through hole 801 Upper case 802 Lower case 803 Panel key P Recording medium (recording paper)

Claims (7)

In a circuit board used in an ink jet recording apparatus that performs recording by discharging ink from a recording means to a recording medium,
A circuit board, wherein a control element is mounted via a plurality of exposed conductors, and a through hole is formed between adjacent exposed conductors of the control element.   The circuit board according to claim 1, wherein the through hole is formed to extend longer than at least one of adjacent conductor exposed portions.   The circuit board according to claim 1, wherein the control element is a switch element.   The circuit board according to claim 1, wherein the switch element is fixed with a bottom surface of the switch element in contact with a switch element holding member.   The circuit board according to claim 1, wherein the switch element holding member is a part of the circuit board.   The circuit board according to claim 1, wherein the switch element holding member is a part of a chassis of the apparatus main body. In an inkjet recording apparatus comprising: a recording unit that performs recording by discharging ink to a recording medium; and a circuit board as a control unit.
A control element is mounted on the circuit board via a plurality of exposed conductors, and a through-hole penetrating the circuit board is formed in a portion of the circuit board between adjacent conductor exposed parts of the control element. An ink jet recording apparatus.

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