JP2001237571A - Component mounting method, component assembly, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that mounting different kinds of components using a positioning jig, a tool, etc., hinders the simplification of a mounting process and it is difficult to accurately set the relative positions of the components mounted on different surfaces of a substrate. SOLUTION: This is a component assembly equipped with a 1st component 16 having a positioning reference surface 38, a 2nd component 18 which has a set positioning surface 32 abutting against the positioning reference surface 38 of the 1st component 16, and a substrate 17 where those 1st and 2nd components 16 and 18 are fixed while the positioning surface 32 abuts against the positioning reference surface 38. The substrate 17 has holding parts 29 and 31 which hold the 2nd component 18 so that the positioning surface 32 of the 2nd component 17 can be displaced opposite to the positioning reference surface 38 and is further equipped with an energizing means 25 which elastically presses the positioning surface 32 of the 2nd component 18 against the reference surface 38 of the 1st component 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting a plurality of components on a substrate in a mutually positioned manner, a component assembly obtained by the method, and an image forming apparatus incorporating the component assembly. In particular, it is suitable for application to an ink jet printer incorporating a printed circuit board on which a plurality of components are mounted.

[0002]

2. Description of the Related Art In various electronic apparatuses, printed circuit boards are often used to form desired electric circuits. The components mounted on the printed circuit board are also various, such as sensors and connectors. Also,
In such electronic devices, components connected via cables and the like are mounted on a printed circuit board in order to reduce components for the purpose of miniaturization and cost reduction. With the increase in precision, it is required to improve the accuracy of relative positions between various components mounted on a printed circuit board or between components mounted on a substrate and components mounted on the substrate.

For example, in a carriage incorporated in a serial scan type ink jet printer, the above-described printed circuit board is fixed.
On this printed circuit board, a connector for transmitting power and a drive signal to a head cartridge detachably mounted on the carriage, a sensor for detecting a scanning position of the carriage, and the like are mounted.

FIG. 13 shows a schematic structure of a carriage portion incorporated in such a serial scan type ink jet printer. That is, a printed circuit board 2 fixed to a carriage 1 of an ink jet printer has a photosensor 4 for detecting the position of the carriage 1 which scans and moves along a linear guide rod 3, and a head cartridge from the main body side. A cable connector 6 for supplying power and a drive signal to the cartridge 5 and a cartridge connector 7 for supplying power and a drive signal to the head cartridge 5 mounted on the carriage 1 are mounted. The head cartridge 5 mounted on the carriage 1 is fixed in a positioning state with respect to the carriage 1 or can be detached from the carriage 1 by operating a detachable lever (not shown).

In order to satisfy the print position accuracy along the scanning movement direction of the carriage 1, the relative movement accuracy between the components required for the function of the ink jet printer is determined in the scanning movement direction of the carriage 1 (in FIG. Direction) from the photo sensor 4 to the head cartridge 5
In order to satisfy the print position accuracy along the distance a to the ejection port 8 and the direction (vertical direction in FIG. 13) orthogonal to the scanning movement direction of the carriage 1, the head cartridge 5
From the predetermined position to the center axis surface 9 of the guide rod 3 along the direction orthogonal to the scanning movement direction of the carriage 1, and the distance between the cartridge connector 6 and the head cartridge 5 along the scanning movement direction of the carriage 1. In order to satisfy the electrical connection, the distance c from the head cartridge 5 to the connector 6 along the scanning movement direction of the carriage 1 is important.

Therefore, the photo sensor 4 and the cartridge connector 7 mounted on the printed circuit board 2 are
In both cases, it is necessary to set the position accuracy strictly with respect to the carriage 1. Conventionally, the photo sensor 4 and the cartridge connector 7 are positioned with respect to the printed circuit board 2 using a dedicated positioning jig or tool. These were soldered to the printed circuit board 2.

[0007]

Conventionally, the positioning of the photosensor 4 and the cartridge connector 7 with respect to the printed circuit board 2 is performed using a positioning jig or a tool, and these are soldered to the printed circuit board 2 in this state. The method described above has the following disadvantages.

More specifically, when two or more types of components 4 and 7 mounted on the printed circuit board 2 are required to have relative positional accuracy with respect to the carriage 1 to which the printed circuit board 2 is fixed, a positioning jig or a tool is required. Positioning them by using such a method is a factor that hinders simplification of the mounting process. Moreover, components 4, 7 mounted on different mounting surfaces of the printed circuit board 2, such as the photo sensor 4 mounted on one mounting surface of the printed circuit board 2 and the cartridge connector 7 mounted on the other mounting surface. Since the mounting processes are different from each other, positioning jigs and the like must be used individually, and the photosensor 4 and the cartridge connector 7
It was difficult to accurately set the relative position between.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for mounting a plurality of components respectively fixed to different surfaces of a substrate on a substrate in a mutually positioned state, a component assembly assembled by the mounting method, and the component assembly. It is another object of the present invention to provide an image forming apparatus incorporating a printer.

[0010]

According to a first aspect of the present invention, there is provided a method of fixing a first component having a positioning reference surface set on a substrate, and the positioning surface set on a second component having the positioning surface. Attaching the second component to the substrate in a state where the positioning surface is elastically pressed against the positioning reference surface so that the positioning component can be displaced in a direction facing the reference surface; and Fixing the second component to the substrate in a state in which the positioning component is in contact with the positioning surface.

According to a second aspect of the present invention, there is provided a first component having a positioning reference surface set thereon, a second component having a positioning surface contacting the positioning reference surface of the first component, A substrate to which the first and second components are fixed in a state where the positioning surface is in contact with the positioning reference surface, wherein the substrate is a positioning surface of the second component. Has a holding portion for holding the second component so that the second component can be displaced in a direction facing the positioning reference surface, and the positioning surface of the second component is fixed to the first component.
And a biasing means for elastically pressing the positioning reference surface of the component.

According to a third aspect of the present invention, there is provided a first component having a positioning reference surface set therein, a second component having a positioning surface contacting the positioning reference surface of the first component,
A component assembly having a substrate to which the first and second components are fixed in a state where the positioning surface is in contact with the positioning reference surface, and forming an image by discharging a liquid to a print medium from a discharge port, respectively. And a mounting portion for a liquid ejection head for performing the operation, wherein the substrate is arranged so that the positioning surface of the second component can be displaced in a direction facing the positioning reference surface. A holding unit for holding the second component, wherein the component assembly includes:
It is characterized by further comprising a biasing means for elastically pressing the positioning surface of the second component against the positioning reference surface of the first component.

According to the present invention, the second component is held by the holding portion of the substrate to which the first component is fixed, and the biasing means positions the second component with respect to the positioning reference plane of the first component. The surface is elastically pressed, and in this state, the second
Are fixed to the board. Thus, the relative positions of the first component and the second component fixed to the substrate are accurately maintained by the positioning reference surface of the first component and the positioning surface of the second component.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a component mounting method according to a first aspect of the present invention, a positioning reference fitting set on a second component fixed to a substrate with a positioning fitting surface set on a third component. The method may further include the step of fixing the third component to the board while being fitted to the surface, and in this case, there may be a plurality of third components.

The first component may be fixed to the first surface of the substrate, and the second component may be fixed to the second surface of the substrate. The step of fixing the second component to the substrate may be performed prior to the step of fixing the second component to the substrate.

Further, the substrate is a printed wiring board,
The components may be fixed to the board by soldering.

In the component assembly according to the second aspect of the present invention, the positioning fitting portion is set, and the board is mounted in a state where the positioning fitting portion is fitted to the positioning reference fitting portion set for the second component. May be further provided with a third component fixed to the third component. In this case, the substrate may further include a holding portion that holds the third component so as to be displaceable with respect to the substrate in the same direction as the displacement direction of the second component with respect to the substrate, or There may be a plurality of third parts.

Further, the first component may be fixed to the first surface side of the substrate, the second component may be fixed to the second surface side of the substrate, and the urging means may be fixed to the second component. It may be formed integrally.

Further, the substrate is a printed wiring board,
The components may be fixed to the board by soldering.

According to a third aspect of the present invention, in the image forming apparatus, a positioning fitting portion is set, and the positioning fitting portion is fitted to a positioning reference fitting portion set in the second component. It may further include a third component fixed to the substrate.

Further, the mounting portion of the liquid discharge head may have a carriage that can scan and move in a direction intersecting with the transport direction of the print medium from which liquid is discharged from the liquid discharge head. In this case, the liquid ejection head may be detachably mounted on the carriage via attachment / detachment means, or the component assembly may be fixed to the carriage. In this case, the first component may be a sensor for detecting the scanning position of the carriage, and the third component may be a terminal block for making an electrical connection to the liquid ejection head.

The liquid discharge head may have a discharge energy generating section for discharging the liquid from the discharge port. In this case, the discharge energy generating section has a heat energy for causing film boiling in the liquid. May be provided with an electrothermal conversion element that generates the following.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a serial scan type ink jet printer will be described in detail with reference to FIGS. 1 to 12. However, the present invention is not limited to such an embodiment, and It is also applicable to other technologies that are to be encompassed by the inventive concept described in the appended claims.

FIG. 1 shows a schematic structure of an ink jet printer according to this embodiment. That is, the ink jet printer of the present embodiment is configured such that the carriage 203 and the medium transport mechanism for transporting a print medium such as paper (not shown) set on the feed tray 101 onto the platen 301 are perpendicular to the transport direction of the print medium. A carriage scanning mechanism for operating and moving along the print medium in the direction, and a suction recovery device 500 for the head unit 201 mounted on the carriage 203, and these are assembled to the chassis 350, respectively. The carriage scanning mechanism has a scanning guide bar 360 that guides the carriage 203 along the scanning movement direction. The carriage 203 includes a plurality of (four in the illustrated example) ink cartridges 202 corresponding to different color inks. Are exchangeably mounted via the head unit 201. The head unit 201 is provided with a plurality of unillustrated inkjet heads for ejecting ink supplied from the ink cartridge 202, each corresponding to the ink cartridge 202.

The print medium set on the feed tray 101 is conveyed onto a platen 301 by a medium conveying mechanism.
The scanning movement of the carriage 203 which reciprocates along 0 is alternately repeated, and the ink is ejected from the inkjet head of the head unit 201 mounted on the carriage 203 at an appropriate timing. An image is formed.

FIG. 2 shows a rear view of the carriage 203 in this embodiment, and FIG. 3 shows a state in which the printed circuit board unit 11 mounted on the carriage 203 is removed. As shown in FIG. That is, on the rear surface of the carriage 203, two sets are arranged in a straight line along the scanning direction of the carriage 203 in order to fix the printed circuit board unit 11 as the component assembly of the present invention in a positioning state with respect to the carriage 203. Positioning notches 204a,
204b and adjacent positioning notches 204a, 20
4b is formed with a positioning slot 205 located in the middle of 4b. Two sets of positioning notches 204a, 204b
Extend in the scanning direction of the carriage 203, and the positioning long holes 205 extend in a direction orthogonal to the scanning direction of the carriage 203. Further, a plurality of sets (three sets in the illustrated example) of female screw holes 206, 207, and screws for screwing the printed circuit board unit 11 to the carriage 203 are provided.
208 are provided.

Two sets of positioning notches 204a, 204
b and a positioning slot 205 are provided with a pair of first reference pins 12a, 1 described later on the printed circuit board unit 11 side.
2b and the second reference pin 13 are engaged with each other (see FIG. 5), and a pair of first reference pins 12a, 12b and 2
The printed circuit board unit 11 is positioned with respect to the carriage 203 in a direction orthogonal to the scanning direction of the carriage 203 by engagement with the pair of positioning notches 204a and 204b, and the second reference pin 13 and the positioning slot 2 are formed.
The positioning of the printed circuit board unit 11 with respect to the carriage 203 in the scanning direction of the carriage 203 is performed by engagement with the carriage 05. In this state, small screws (not shown) are screwed into the female screw holes 206, 207, and 208,
The printed circuit board unit 11 is integrally fixed to the carriage 203.

In a serial scan type ink jet printer as in this embodiment, the carriage 20
It is necessary to keep the positional accuracy of the photosensor 16 (see FIG. 5) with respect to the terminal blocks 14 and 15 along the scanning direction 3 within a predetermined range. In some cases, such positional accuracy can be ensured.

The first of the printed circuit board units 11
And the second reference pins 12a, 12b, 13
Details will be described below.

FIG. 5 shows the appearance of the printed circuit board unit 11 in this embodiment, and FIG.
That is, the printed circuit board unit 1 in this embodiment
Reference numeral 1 denotes a printed circuit board 17 as a substrate of the present invention, a photosensor 16 as a first component of the present invention mounted on a first surface of the printed circuit board 17, and a second And a third component of the present invention mounted on the second surface of the printed circuit board 17 in a state associated with the positioning bracket 18 provided on the second surface of the printed circuit board 17. (Two in the present embodiment). The photo sensor 16 in the present embodiment is opposed to the scanning guide bar 360 with a scale (not shown) stretched over the chassis 350 in parallel with the scanning guide bar 360, and detects the scanning movement position of the carriage 203. The terminal blocks 14 and 15 transfer power and signals for driving the inkjet head to and from a connection terminal (not shown) provided on the head unit 201 mounted on the carriage 203. In this embodiment, the first terminal block 14 corresponds to, for example, an inkjet head for discharging black ink, and the second terminal block 15
Are, for example, a plurality of inks for color ink ejection (3 in this embodiment).
) Inkjet heads.

FIG. 7 shows the appearance of the printed circuit board 17 described above.
The appearance of the positioning bracket 18 is shown in FIG.
The appearance of the first terminal block 14 is shown in FIG. 9, and the appearance of the second terminal block 15 is shown in FIG.

That is, the printed circuit board 17 has three sets of screw through holes 1 for screwing to the carriage 203.
9, 20, 21; a plurality of through holes 22 for soldering the photosensor 16; and two sets of through holes 23, 24 for soldering the first and second terminal blocks 14, 15, respectively. A rectangular locking hole 26 provided at one end of the positioning bracket 18 into which the first elastic locking portion 25 is inserted, and the positioning bracket 18 together with the locking hole 26 for positioning the positioning bracket 18 with respect to the printed circuit board 17. And the positioning hole 27 is an elongated hole extending along the scanning direction of the carriage 203.

The positioning bracket 18 is formed on the other end side and is locked to the side edge 28 of the printed circuit board 17, and has a second elastic locking portion 29 which can be elastically deformed in the scanning movement direction of the carriage 203. A third elastic locking portion 25 which is formed close to the first elastic locking portion 25, is locked to the lower edge portion 30 of the printed circuit board 17, and is elastically deformable in a direction perpendicular to the scanning movement direction of the carriage 203. An elastic locking portion 31; a positioning reference pin 32 fitted into the positioning hole 27 of the printed circuit board 17;
05 and a first terminal block connecting hole 33 through which one of the first reference pins 12a formed on one end side and provided on the first terminal block 14 penetrates tightly. And a pair of second terminal block connection as a positioning reference fitting surface of the present invention in which a pair of connecting pins 34 provided on the second terminal block 15 as a positioning fitting surface of the present invention are tightly fitted. And a pair of through holes 37 through which a pair of bushings 36 provided in the second terminal block 15 penetrate.

The first elastic locking portion 25 of the positioning bracket 18 is formed at one end of the positioning bracket 18 and is elastically deformable in the scanning movement direction of the carriage 203. Plugged in. Further, the positioning reference pins 32 are
The positioning bracket 18 is thereby positioned with respect to the printed circuit board 17 in a direction perpendicular to the scanning movement direction of the carriage 203. In this state, the positioning reference pin 32 is moved by the spring force of the first and second elastic locking portions 25 and 29.
Presses against the side end surface 38 of the photosensor 16, and in this state, the positioning bracket 1 with respect to the printed circuit board 17.
8 is determined. That is, the side end surface 38 of the photosensor 16 functions as the positioning reference surface of the present invention, and the outer peripheral surface of the positioning reference pin 32 pressed against it functions as the positioning surface of the present invention.

The first terminal block connecting hole 33 is
One of the first reference pins 12a provided on the first terminal block 14 that fits the positioning reference fitting surface of the present invention functions as the positioning fitting surface of the present invention.

The first terminal block 14 is provided with a bush 39 which fits into a pair of screw through holes 20 provided in the printed circuit board 17. Screwed into. Similarly, the pair of bushes 36 of the second terminal block 15 pass through the through holes 37 of the positioning bracket 18 and fit into the pair of screw through holes 20 provided in the printed circuit board 17,
In this state, a screw (not shown) is screwed into the screw hole 208.

In manufacturing the printed circuit board unit 11, first, the photosensor 16 is connected to the printed circuit board 17.
And soldered.
In this state, as shown in FIG. 11, the side end face 38 of the photo sensor 16 faces the positioning hole 27 of the printed circuit board 17, and the positioning reference pin 32 of the positioning bracket 18 is provided on this side end face 38. The positioning bracket 18 is mounted on the printed circuit board 17 by using the spring force of the first elastic locking portion 25 so that the positioning bracket 18 is pressed. At the same time, with one of the first reference pins 12a of the first terminal block 14 fitted in the first terminal block connecting hole 33 of the positioning bracket 18, the bush 39 of the first terminal block 14 is connected to the printed circuit board. 17 is fitted into the screw through hole 20.

As shown in FIG. 12, in this state, the positioning block 18 is prevented from floating above the surface of the printed circuit board 17 by the second and third elastic locking portions 29, 31 provided on the positioning bracket 18. Has become. Further, the bush 39 of the first terminal block 14 can be displaced in the scanning movement direction of the carriage 203 along the elongated screw through hole 20, so that it can follow the displacement of the positioning bracket 18. However, the displacement in the direction orthogonal to this is restricted by the fitting of the bush 39 to the screw through hole 20. As a result, the relative position of the first terminal block 14 with respect to the photo sensor 16 is determined.

Next, the second terminal block 15 is positioned on the positioning bracket 18. That is, the bush 36 of the second terminal block 15 is
And a pair of connecting pins 34 are fitted into the second terminal block connecting holes 35 of the positioning bracket 18 at the same time as they are fitted into the screw through holes 21 of the printed circuit board 17 through the through holes 37. The terminal block 15 is mounted on the positioning bracket 18.

In this state, the connecting pin 34 of the second terminal block 15 is tightly fitted in the second terminal block connecting hole 35 of the positioning bracket 18, and the second terminal block is The positioning of No. 15 is determined. In this case, the bush 36 of the second terminal block 15 can be displaced in the scanning movement direction of the carriage 203 along the elongated screw through hole 21, so that it can follow the displacement of the positioning bracket 18. It is possible.

In this state, the printed circuit board unit 11 is completed by soldering the first and second terminal blocks 14 and 15 to the printed circuit board 17. Then, the printed circuit board unit 11 is mounted on the carriage 203, but the first reference pins 12a, 12
b and the second reference pin 13 with the positioning notches 204a, 204b and the positioning slot 205 of the carriage.
, The relative positions thereof are accurately determined. Thereafter, a small screw (not shown) is connected to the screw through hole 19 of the printed circuit unit 11 and the bush 36,
The printed circuit unit 11 is screwed into the female screw holes 206, 207, and 208 via the
Fix to 03.

In the above-described embodiment, the positioning bracket 18 and the second terminal block 15 are separately configured.
In order to reduce the number of parts and simplify the assembling man-hours, the positioning bracket 18 and the second terminal block 15 are used.
May be integrally formed.

In the present embodiment, the photosensor 16 and the terminal blocks 14 and 15 are assembled on both sides of the printed circuit board 17, but a plurality of components are mounted on the same surface of the printed circuit board. However, when it is necessary to separate the soldering process into automatic soldering and manual soldering, it is necessary to use the principle of the present invention to accurately position a plurality of components with respect to the printed circuit board. Can be easily attached.

The present invention includes a means (for example, an electrothermal converter or a laser beam) for generating thermal energy as energy used for discharging the liquid, and the state of the liquid is controlled by the thermal energy. This provides an excellent effect in an ink jet type image forming apparatus which causes a change. According to such a method, it is possible to achieve higher density and higher definition of the print.

The typical configuration and principle are described in, for example, US Pat. No. 4,723,129 and US Pat.
It is preferable to use the basic principle disclosed in Japanese Patent Application No. 0796. This method can be applied to both the so-called on-demand type and the continuous type. In particular, in the case of the on-demand type, it is arranged corresponding to the sheet or the flow path holding the liquid. Heat energy is generated by applying at least one drive signal to the electrothermal transducer to give a rapid temperature rise exceeding nucleate boiling corresponding to print information, thereby causing film boiling on the heat working surface of the liquid discharge head. As a result, bubbles in the liquid corresponding to this drive signal one-to-one can be formed, which is effective. By the growth and shrinkage of the bubble, the liquid is discharged through the discharge port to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that the ejection of the liquid having particularly excellent responsiveness can be achieved. As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in U.S. Pat. No. 4,313,124 relating to the rate of temperature rise of the heat acting surface are adopted, more excellent printing can be performed.

The structure of the liquid discharge head is a combination of a discharge port, a liquid path, and an electrothermal converter as disclosed in each of the above-mentioned specifications (the electric heat converter is arranged along the liquid path). U.S. Pat. No. 6,059,055 discloses a configuration in which a disposed linear liquid flow path or an electrothermal converter is disposed in a region where a heat acting portion is bent in addition to a liquid flow path and a right-angled liquid flow path directly facing the discharge port. Patent No. 4558333 and US Patent No. 44596
The configuration using the specification of No. 00 is also included in the present invention. In addition, Japanese Unexamined Patent Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal transducer for a plurality of electrothermal transducers, and an aperture for absorbing a pressure wave of thermal energy is provided. The effects of the present invention are effective even if the configuration is based on JP-A-59-138461, which discloses a configuration corresponding to the ejection unit. That is, according to the present invention, printing can be performed reliably and efficiently regardless of the form of the liquid discharge head.

Further, the present invention can be effectively applied to a full-line type liquid ejection head having a length corresponding to the maximum width of a print medium that can be printed by the image forming apparatus. Such a liquid ejection head may have a configuration that satisfies the length by a combination of a plurality of liquid ejection heads or a configuration as a single integrally formed liquid ejection head.

In addition, even in the case of the serial type as described above, the liquid discharge head integrally fixed to the carriage that moves for scanning, or the liquid ejecting head that is exchangeably mounted on the carriage, can be connected to the carriage. Even when using a replaceable chip-type liquid ejection head that enables electrical connection and supply of liquid from the apparatus main body, or a cartridge that is provided with a tank that stores liquid integrally with the liquid ejection head itself The present invention is effective.

The effect of the present invention can be further stabilized by adding a recovery means or a preliminary auxiliary means for making the state of liquid discharge from the liquid discharge head proper as a configuration of the image forming apparatus of the present invention. It is preferable because it can be performed.
Specific examples thereof include a capping unit for the liquid ejection head, a cleaning unit, a pressurizing or suctioning unit, a preheating unit for heating using an electrothermal transducer, another heating element, or a combination thereof. ,
Preliminary ejection means for performing ejection other than printing can be used.

Regarding the type and number of liquid ejection heads to be mounted, for example, in addition to one provided corresponding to a single color ink, a plurality of inks having different print colors and densities (lightness) are provided. May be provided in plurality. That is, for example, the print mode of the image forming apparatus is not limited to a print mode of only a mainstream color such as black, and may be either an integrated liquid discharge head or a combination of a plurality of liquid discharge heads. The present invention is extremely effective also in an apparatus provided with at least one of the print modes of full-color by color or mixed color. In this case, it is also effective to discharge a processing liquid (printability improving liquid) for adjusting the printability of the ink to the print medium from a dedicated or common liquid discharge head according to the type of print medium and the print mode.

Further, in the embodiment of the present invention described above, a material which solidifies at or below room temperature and softens or liquefies at room temperature may be used, or in the case of the ink jet system, the liquid itself is 30 to 70 ° C. In general, the temperature is adjusted within the range described above to control the temperature so that the viscosity of the liquid is in the stable ejection range. Therefore, a liquid that is in a liquid state when the used print signal is applied may be used. In addition, in order to positively prevent the temperature rise due to thermal energy by using it as the energy of the state change from the solid state to the liquid state, or to prevent the liquid from evaporating, it is solidified in a standing state and liquefied by heating. May be used. In any case, such as a liquid that is liquefied by application of heat energy according to a print signal and a liquid is discharged, and a liquid that already starts to solidify when it reaches a print medium,
The present invention is also applicable to a case where a material that liquefies for the first time by applying heat energy is used. The liquid in such a case is, as described in JP-A-54-56847 or JP-A-60-71260, in a state where it is held as a liquid or solid substance in the concave portion or through hole of the porous sheet. Alternatively, it may be configured to face the electrothermal converter. In the present invention, the most effective one for each of the above-mentioned liquids is to execute the above-mentioned film boiling method.

The form of the image forming apparatus according to the present invention can be used as an image output terminal of an information processing apparatus such as a computer, a copying apparatus combined with a reader or the like, a facsimile apparatus having a transmission / reception function, or the like. The printing medium may be in the form of a printing device. The printing medium may be a sheet or long paper or cloth, or a plate or wood, stone, resin, glass, metal, or the like, or may be three-dimensional. Examples include three-dimensional structures.

[0053]

According to the present invention, the second component is held so that the positioning surface of the second component can be displaced in the direction facing the positioning reference surface of the first component fixed to the substrate. The holding portion is provided on the substrate, and the positioning surface of the second component is elastically pressed against the positioning reference surface of the first component by the urging means, and the second component is fixed to the substrate in this state. Therefore, the relative position of the second component with respect to the first component fixed to the substrate can be set accurately.

In a state where the positioning fitting surface set to the third component is fitted to the positioning reference fitting surface set to the second component fixed to the substrate, the third component is removed. In the case where the third component is fixed to the substrate, the relative position of the third component can be accurately set via the second component with respect to the first component fixed to the substrate. The third component can be fixed to the substrate.

When the board is a printed wiring board and the components are fixed to the board by soldering, a plurality of electronic components can be accurately mounted on the printed wiring board.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of an internal structure of an inkjet printer according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a rear appearance of a carriage incorporated in the ink jet printer illustrated in FIG.

FIG. 3 is an exploded perspective view illustrating a state where a printed circuit board unit is removed from the carriage illustrated in FIG. 2;

FIG. 4 is a rear view of the carriage shown in FIG.

FIG. 5 is a perspective view illustrating an appearance of the printed circuit board unit illustrated in FIG.

FIG. 6 is an exploded perspective view of the printed circuit board unit shown in FIG.

FIG. 7 is a perspective view of a printed circuit board constituting a part of the printed circuit board unit shown in FIG. 6;

8 is a perspective view illustrating an appearance of a positioning bracket that constitutes a part of the printed circuit board unit illustrated in FIG.

FIG. 9 is a perspective view illustrating an appearance of a first terminal block constituting a part of the printed circuit board unit illustrated in FIG.

FIG. 10 is a perspective view illustrating an appearance of a second terminal block constituting a part of the printed circuit board unit illustrated in FIG.

FIG. 11 is a conceptual diagram illustrating a state where a photo sensor is mounted on a printed circuit board.

FIG. 12 is a perspective view illustrating an appearance of a printed circuit board unit before a second terminal block is attached to a positioning bracket.

FIG. 13 is a plan view of a part of a carriage incorporated in the inkjet printer according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Printed circuit board unit 12a, 12b 1st reference pin 13 2nd reference pin 14, 15 Terminal block 16 Photosensor 17 Printed circuit board 18 Positioning bracket 19-21 Screw through hole 22-24 Through hole 25 First elastic locking Part 26 locking hole 27 positioning hole 28 side edge 29 second elastic locking part 30 lower edge 31 third elastic locking part 32 positioning reference pin 33 first terminal block connecting hole 34 connecting pin 35 2 terminal block connecting hole 36 bush 37 through hole 38 side end face 39 bush 101 feed tray 201 head unit 202 ink cartridge 203 carriage 204a, 204b positioning notch 205 positioning long hole 206, 207, 208 female screw hole 301 platen 350 Chassis 360 scan Guide rod 500 Suction recovery device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B41J 2/01 B41J 3/04 101Z 25/34 25/28 Z F Term (Reference) 2C056 FA03 FA10 HA09 HA51 HA60 KD06 2C064 CC04 CC05 CC14 4E353 AA05 AA07 AA16 AA17 AA19 BB05 CC02 CC12 CC13 CC16 CC32 CC33 DD01 DD05 DD08 DD11 DD15 DR04 DR05 DR08 DR14 DR23 DR24 DR27 DR32 DR47 DR49 DR53 GG07 GG09 GG21

Claims (21)

[Claims] 1. A step of fixing a first component having a positioning reference plane set thereon to a substrate, such that a positioning surface set on a second component can be displaced in a direction facing the positioning reference surface. Attaching the second component to the substrate with the positioning surface elastically pressed against the positioning reference surface; and setting the second component in a state where the positioning reference surface and the positioning surface are in contact with each other. Fixing the component to the substrate. 2. The third component in a state where a positioning fitting surface set on a third component is fitted on a positioning reference fitting surface set on the second component fixed to the substrate. 2. The component mounting method according to claim 1, further comprising the step of fixing the component to the substrate. 3. The component mounting method according to claim 2, comprising a plurality of said third components. 4. The apparatus according to claim 1, wherein the first component is fixed to a first surface of the substrate, and the second component is fixed to a second surface of the substrate. The described component mounting method. 5. The component mounting method according to claim 1, wherein the step of fixing the first component to the substrate is performed before the step of fixing the second component to the substrate. . 6. A component mounting method, wherein the substrate is a printed wiring board, and the fixing of the component to the substrate is performed by soldering. 7. A first component having a positioning reference surface set thereon, a second component having a positioning surface abutting on the positioning reference surface of the first component, and the positioning surface being located on the positioning reference surface. A board to which the first and second components are fixed in contact with each other, wherein the board has a positioning surface of the second component facing the positioning reference surface. So that it can be displaced
A component assembly having a holding portion for holding the component, and further comprising biasing means for elastically pressing the positioning surface of the second component against the positioning reference surface of the first component. I. 8. A third component fixed to the substrate in a state in which a positioning fitting portion is set, and the positioning fitting portion is fitted to a positioning reference fitting portion set in the second component. The component assembly according to claim 7, further comprising: 9. The method according to claim 1, wherein the substrate is a second substrate with respect to the substrate.
9. The component assembly according to claim 8, further comprising a holding portion that holds the third component so as to be displaceable with respect to the substrate in the same direction as the component displacement direction. 10. 10. The component assembly according to claim 8, comprising a plurality of said third components. 11. The method according to claim 7, wherein the first component is fixed to a first surface of the substrate, and the second component is fixed to a second surface of the substrate. Part assembly as described. 12. The component assembly according to claim 7, wherein said urging means is formed integrally with said second component. 13. The component assembly according to claim 1, wherein the substrate is a printed wiring board, and the fixing of the component to the substrate is performed by soldering. 14. A first component having a positioning reference surface set thereon, a second component having a positioning surface contacting the positioning reference surface of the first component, and the positioning surface having the positioning reference surface. A component assembly having a substrate to which the first and second components are fixed in contact with each other; and a mounting portion for a liquid discharge head for discharging a liquid from a discharge port to a print medium to form an image. An image forming apparatus comprising: the substrate, wherein the substrate is disposed in the second position so that a positioning surface of the second component can be displaced in a direction facing the positioning reference surface.
The component assembly further includes a biasing unit that elastically presses the positioning surface of the second component against the positioning reference surface of the first component. Characteristic image forming apparatus. 15. A third component fixed to the substrate in a state where a positioning fitting portion is set, and the positioning fitting portion is fitted to a positioning reference fitting portion set to the second component. The image forming apparatus according to claim 14, further comprising: 16. The liquid ejecting head according to claim 16, wherein:
16. The printing apparatus according to claim 14, further comprising a carriage that can scan and move in a direction intersecting a transport direction of a print medium from which liquid is discharged from the liquid discharge head.
An image forming apparatus according to claim 1. 17. The image forming apparatus according to claim 16, wherein the liquid discharge head is detachably mounted on the carriage via a detachable unit. 18. The image forming apparatus according to claim 16, wherein the component assembly is fixed to the carriage. 19. The liquid ejecting apparatus according to claim 19, wherein the first component is a sensor for detecting a scanning position of the carriage, and the third component is a terminal block for making an electrical connection to the liquid ejection head. The image forming apparatus according to claim 18, wherein 20. The image forming apparatus according to claim 14, wherein the liquid discharge head has a discharge energy generating unit for discharging a liquid from a discharge port. 21. The image forming apparatus according to claim 20, wherein the discharge energy generation unit has an electrothermal conversion element that generates heat energy that causes film boiling of the liquid.