JP2007253451A - Line head module and electronic equipment with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the distortion of an image formed by a printer, for example. <P>SOLUTION: In the line head module 101, in consideration of dislocation of a plurality of light sources 72 from each other caused by the bending of a device board 10 at the time when driving IC chips 14 are mounted, the light sources 72 are arranged in appropriate positions on the device board 10 before the driving IC chips 14 are mounted on the device board 10. The deformation of the line head due to the nonuniformity of the distribution of the driving IC chips 14 in the line head 1 and heat during mounting corrects the relative positions of the light sources 72 to ensure that the light sources 72 are arranged straight along the X direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a technical field of a line head module and an electronic apparatus including the line head module, such as a printer or a scanner.

In this type of line head module, for example, light emitted from the line head is condensed by a lens array and imaged on a photosensitive member. In such a line head module, the line head includes, for example, an organic EL (Electro-Luminescence) element as a light source.

In an electronic apparatus such as a printer or a scanner provided with a line head module, a technique for correcting a relative positional shift between an optical system including the line head and a photosensitive drum and forming a high-quality image is disclosed. (For example, Patent Document 1).

JP-A-63-271275

In this type of line head module, a driving circuit such as a driving IC is mounted on the line head by a bonding method, and a light source such as an organic EL element is driven by the driving circuit when the line head module is operated.

However, in such a line head, when a glass substrate is used as a substrate on which a light source such as an organic EL element is formed, the glass substrate is bent by heat applied when the driving IC is mounted on the glass substrate. The position of the light source will shift. More specifically, for example,
Even if a plurality of light sources are arranged in a straight line along the length direction of the substrate on the substrate, the relative positions of the plurality of light sources are shifted due to deformation of the line head, etc. After the circuit is mounted on the line head, the plurality of light sources may not be aligned.

If the lens array is arranged on the line head in a state where the relative positions of the plurality of light sources are shifted, even if the line head module is assembled by accurately aligning the lens array and the line head, The light emission line of the light source cannot be aligned with the center line of the lens array. Therefore, along the length direction of the line head module, the image formed by focusing the light collected by the lens near the center of the lens array is combined with the light collected by the lens near the end. The image is distorted as compared with the image formed by imaging, and there is a problem that the quality of a printed image finally printed on paper is deteriorated in an electronic device such as a printer.

Accordingly, the present invention has been made in view of the above problems, and for example, a line head module used for an exposure head or the like that can improve the quality of a printed image printed by a printer or the like, and such a line head module. It is an object of the present invention to provide an electronic device such as a printer or a scanner including the above.

In order to solve the above-mentioned problem, the line head module of the present invention has a substrate, a line head having a plurality of light sources arranged along the length direction of the substrate, and the line head, and is disposed to face the line head. And a lens array having a plurality of lens elements arranged along the length direction, and before mounting a drive circuit unit for driving the light source on the line head, the plurality in the width direction of the line head. The relative positions of the light sources of each other are corrected.

According to the line head according to the present invention, during the operation, the light emitted from the light sources arranged in a line along the length direction of the substrate such as one row or two rows on the substrate,
Various image formation can be performed by performing on / off control according to the drive signal supplied to each light source from the drive circuit unit. The drive circuit unit is provided on the substrate for each light source or for each group of a predetermined number of light sources as a group, and is added to the line head when the drive circuit unit is mounted on the line head as will be described later. Due to the heat, the line head is deformed in accordance with the non-uniform arrangement of the driving circuit portion on the substrate.

The lens array collects light emitted from a plurality of light sources through lens elements arranged along the length direction of the substrate during the operation of the line head module, and is opposite to the line head on the basis of the lens array. The condensed light is imaged on the side.

The line head is deformed by heat applied when the drive circuit unit is mounted on the line head. Therefore, even if a plurality of light sources are arranged on the substrate along the length direction of the substrate so as to form a straight light-emitting line, the light-emitting line is not straight due to the deformation of the line head. The line deviates from the center line of the lens element. More specifically, the heat applied to the line head when the driving circuit unit is mounted on the line head is applied nonuniformly to the line head according to the arrangement of the driving circuit unit on the substrate. Therefore, the line head is curved along the width direction of the line head due to the thermal expansion in each part of the substrate and the difference in heat capacity, and a plurality of light sources are arranged in advance so that the light emission lines are in a straight line. However, the relative position along the width direction of the plurality of light sources shifts with the deformation of the line head. Even if the line head module is assembled by accurately positioning the line head and the lens array in a state where the relative positions of the plurality of light sources are shifted in this manner, the line head module is physically overlapped with the center line of the lens element. In addition, the light emission lines cannot be aligned in a line.

Therefore, in the line head module according to the present invention, the relative relationship between the light sources in the width direction of the line head due to the deformation of the line head caused by the heat applied to the line head when the drive circuit unit is mounted on the line head. By correcting the correct position, the light emission line connecting the plurality of light sources overlaps the center line of the plurality of lens elements.

Here, the “light emission line” is a virtual line connecting a plurality of light sources arranged along the length direction of the substrate. More specifically, for example, when a plurality of light sources are arranged in a line along the length direction of the substrate, the light emission line is a line formed by connecting the centers of the plurality of light sources to each other. In the case where the light sources are arranged in two rows along the length direction of the substrate, a line formed by connecting the centers of the light sources positioned so as to be shifted from each other along the width direction of the substrate. is there.

The “center line” is a virtual line formed by connecting the centers of a plurality of lens elements. More specifically, for example, when a plurality of lens elements are arranged in a line along the length direction of the substrate, the center line is a line that connects the centers of the plurality of lens elements to each other. Yes, when a plurality of lens elements are alternately arranged in two rows along the length direction of the substrate (that is, arranged in a staggered manner), they are shifted from each other along the width direction of the substrate. This is a line formed by connecting the centers of the lens elements located at the center.

Therefore, since a plurality of light sources are arranged in a straight line along the length direction in a state where the line head and the lens array are assembled or before assembling, the light emitting line should be positioned with high accuracy. In this case, they overlap with the center line.

Since the light emission line and the center line overlap each other, light emitted from each of the plurality of light sources is efficiently condensed through each of the plurality of lens elements. In addition, the image formed by focusing the condensed light is not distorted near the center and the end of the line head module along the length direction of the substrate. . More specifically, on the opposite side of the line head with respect to the lens array, the light collected through each lens element is imaged at an equal distance from the lens array. Therefore, for example, when a photosensitive drum or the like is exposed using the line head module according to the present invention, a high-quality image with suppressed distortion can be formed. Note that the plurality of light sources are arranged on the substrate in advance in consideration of the deformation amount of the line head so that the light emission line and the center line overlap each other at the stage of mounting the driving circuit unit, for example.

As described above, according to the line head module according to the present invention, even when the line head is formed using a substrate that is deformed by heat, the positions of a plurality of light sources are corrected to appropriate positions. The light collected through the lens is imaged at an equal distance from the lens array. Therefore, a high-quality image can be formed by using the line head module according to the present invention for an exposure head provided in an electronic apparatus such as a printer or a scanner.

In one aspect of the line head module according to the present invention, each of the plurality of light sources emits the plurality of light sources from a direction along the length direction when the drive circuit unit is mounted on the line head. As seen, the light emitting line connecting the plurality of light sources and the center line connecting the centers of the plurality of lens elements overlap each other before the driving circuit unit is mounted on the substrate. It may be arranged at the position.

According to this aspect, the plurality of light sources are arranged on the substrate in advance so that the plurality of light sources overlap each other when the plurality of light sources are viewed from the direction along the length direction after the driving circuit unit is mounted. More specifically, for example, the change in size and shape due to the thermal expansion of the line head based on the thermal characteristics such as the thermal expansion coefficient of the substrate or the thermal capacity, and the temperature change of the line head before and after mounting the driving circuit unit. Are calculated experimentally, theoretically, or simulated, and based on the calculated deformation amount of the line head, the plurality of light sources are set in a predetermined manner on the substrate in anticipation of changes in the relative positions of the light sources. Placed in position.

According to this aspect, since the light emitting lines of the plurality of light sources can be aligned in a straight line after the driving circuit unit is mounted on the line head, the line head module and the lens array are positioned with high accuracy. By assembling, the light emission line and the center line can be overlapped with each other.

In another aspect of the line head module according to the present invention, the drive circuit unit is mounted on a plurality of drives mounted in a region extending along one edge of a pair of edges extending along the length direction on the substrate. IC chip may be used.

According to this aspect, the plurality of driving IC chips mounted in the region extending along one edge makes the thermal expansion of the line head non-uniform with respect to the center of the line head along the width direction. The line head bends along the substrate surface of the substrate included in. More specifically, the amount of deformation increases toward the end of the line head along the length direction of the substrate. According to this aspect, even when the line head is bent so that the amount of deformation increases toward the end of the line head along the length direction of the substrate, the relative positional deviation of the plurality of light sources due to the bending is reduced. These light sources are previously arranged at predetermined positions.

Therefore, according to this aspect, even if the line head is deformed due to the non-uniformity of the distribution of the driving IC chips in the line head and the heat at the time of mounting, conversely, the deformation is anticipated in advance and the plurality of light sources By arranging at a predetermined position, the position of each light source can be corrected so that the light emitting line and the center line overlap with each other by mounting the driving IC chip.

In another aspect of the line head module according to the present invention, the lens element may be a gradient index lens having different refractive indexes along the radial direction of the lens element.

According to this aspect, the SELFOC lens array (an example of a gradient index lens)
By adopting (registered trademark), an erecting equal-magnification image can be formed without distortion.

In another aspect of the line head module according to the present invention, the plurality of light sources may be configured using organic EL elements.

According to this aspect, a high-quality image can be formed by taking advantage of the high luminous efficiency of the organic EL element.

In order to solve the above problems, an electronic apparatus of the present invention comprises the above-described line head module.

The electronic apparatus according to the present invention includes the above-described line head module according to the present invention, so that the use efficiency of light emitted from the line head can be improved and high-quality image formation can be performed. Various electronic devices such as copy, scanner and facsimile can be realized.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, organic E
A line head module including a line head using an L element as a light source will be described as an example.

<1: Line head module>
First, with reference to FIG.1 and FIG.2, the whole structure of the line head module which concerns on this embodiment is demonstrated. FIG. 1 is a cross-sectional view illustrating a configuration of a line head module according to the present embodiment, and FIG. 2 is a perspective view illustrating an arrangement relationship between a lens array and a line head in the line head module.

In FIG. 1 and FIG. 2, the scale of each member is made different so that each member has a size that can be recognized on the drawing. This is the same for each figure after FIG. 3 described later.

As shown in FIG. 1, in the present embodiment, the line head module 101 includes a line head 1 and a lens array 60 that are integrally supported by a support member 90, for example. The line head 1 will be described in detail later, but as shown in FIG. 2, a plurality of light sources 72 arranged in a line along the length direction of the element substrate, for example, on an element substrate such as a glass substrate.
And is supported by the support member 90 on the side surface of the outer peripheral surface thereof. In FIG. 2, the arrangement of the plurality of light sources 72 in the line head 1 is schematically shown.

1 and 2, the lens array 60 constituting the condensing optical system is disposed in a slit-like opening at the upper end portion of the support member 90 in each drawing, and is supported by the support member 90. The lens array 60 is configured by, for example, arranging a plurality of gradient index lenses 60a in a zigzag pattern along the arrangement direction of the plurality of light sources 72 in the line head 1.
Such a lens array 60 can be formed by, for example, a Selfoc lens array (registered trademark) in which Selfoc (registered trademark) lenses are arranged. In this case, each gradient index lens 60a is a cylindrical lens, and light emitted from any one light source 72 in the line head 1 is condensed by two or more gradient index lenses 60a. The At this time, the lens array 60 receives light incident from a direction perpendicular to the light incident surface,
Alternatively, the light incident from a direction that forms an angle within a predetermined range with respect to the vertical direction can be collected. In particular, when the lens array 60 is formed of a SELFOC lens array (registered trademark), by empirically making light incident from the vicinity of the vertical direction with respect to the light incident surface of the lens array 60, The amount of light that can be collected can be increased. In addition, according to the gradient index lens 60a, the image plane distance can be reduced, and the line head module 101 can be downsized.

Here, the line head module 101 according to the present embodiment is incident because the center line of the lens array 60 and the light emission line connecting the centers of the plurality of light sources 72 overlap each other as described later. By condensing the light and forming an image, it is possible to obtain an erecting equal-magnification real image with reduced distortion in the entire line head module 101 along the length direction. still,
The lens array 60 is an optical system that can collect light incident on the lens array 60.
In addition to various lenses, it can be formed by an optical element such as a mirror. Further, the lens array 60 may be configured to have a one-to-one correspondence with each light source 72 of the line head 1 and to collect light from the corresponding light source 72.

In the present embodiment, as shown in FIG. 1, in the line head module 101, a first transparent member 80 is provided between the line head 1 and the lens array 60. In FIG. 1, the first space is formed in the space between the line head 1 and the lens array 60 in the support member 90.
The transparent member 80 is filled and formed. If the first transparent member 80 is formed of a material having a predetermined refractive index, the amount of light that can be collected through the lens array 60 can be increased.

During the operation of the line head module 101, on / off of the light source 72 is controlled according to the image signal, and various image formation is performed by the light emitted from the line head 1.

Next, the configuration of the line head 1 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a plan view schematically showing the configuration of the line head 1, and FIG. 4 is a diagram showing the configuration relating to driving of each light source.

In FIG. 3, the line head 1 has a plurality of light sources 72 arranged in a line in the length direction of the element substrate 10 on a strip-shaped element substrate 10 whose length direction is the left-right direction in FIG. It is constituted by. FIG. 3 shows a configuration in which a plurality of light sources 72 are arranged in a line along a side extending in the length direction of the element substrate 10. In the present embodiment, on the element substrate 10,
A plurality of light sources 72 may be formed along one side of the element substrate 10 in two or more rows, for example, in an array.

On the element substrate 10, the peripheral portions of the plurality of light sources 72 are arranged together with the data lines 13 for driving these light sources 72, the external circuit connection wiring 18, the ground wiring 19, and the like together with “
A plurality of driving IC chips 14 constituting an example of the “driving circuit section” are provided. On the element substrate 10, a signal supplied from the data line 13 and the driving IC chip 14 to each light source 72 is supplied to each light source 72 via the pixel circuit 15. A signal supplied from the driving IC chip 14 to each of the plurality of light sources 72 via the data line 13 is generated from a signal supplied from the external circuit to each driving IC chip 14 via the external circuit connection wiring 18. The

As shown in FIG. 4, each pixel circuit 15 is supplied to FIGS. 3 and 4 via line scanning signals S 1,..., Sn, and data lines 13 that are supplied line-sequentially from the driving IC chip 14. Transistor T whose driving state is controlled by a data signal supplied from an external circuit (not shown)
Includes R1 and TR2. A current corresponding to the data signal is supplied to the light source 72 through one transistor TR2 of the pixel circuit 15 at a timing based on the line scanning signal Si (i = 1,..., N). Is driven.

In this embodiment, the light source 72 is formed of an organic EL element, and is driven by various methods such as a voltage program method and a current program method. The anode of the organic EL element 72 is electrically connected to the drain of the transistor TR 2, and the cathode is electrically connected to the ground wiring 19. The source of the transistor TR2 is electrically connected to a power supply line for supplying a current corresponding to the data signal supplied to the gate of the transistor TR2 through the other transistor TR1 of the pixel circuit 15. .

Next, a specific configuration of the line head module 101 will be described with reference to FIGS. FIG. 5 is an exploded perspective view showing a main part constituting the line head module 101, and FIG. 6 is a plan view showing a specific structure of the line head module 101. FIG. 7 is a conceptual diagram showing the shape of the light emitting line before the driving IC chip is mounted, and FIG. 8 is a conceptual diagram showing the shape of the light emitting line after the driving IC chip is mounted. FIG. 9 is a plan view showing the positional relationship between the light emitting line and the center line in a comparative example of the line head module according to the present embodiment.

In FIG. 5, the line head module 101 includes a line head 1 and a lens array 60.
, And a plurality of driving IC chips 14.

The planar shape of the line head 1 is a strip shape, and the plurality of driving IC chips 14 extend along one edge of a pair of edges extending along the length direction (X direction in the drawing) of the element substrate 10. Implemented in the area. Accordingly, the plurality of driving IC chips 14 are on the element substrate 10 along the width direction (Y direction in the drawing) of the element substrate 10 and on the side close to one edge of the line head 1 with reference to the center of the line head 1. Only implemented in

The driving IC chip 14 is mounted on the element substrate 10 by a bonding method before the line head module 101 is assembled. Accordingly, as shown in FIG. 5, due to the heat applied to the element substrate 10 when the driving IC chip 14 is mounted and the non-uniformity of the arrangement state of the driving IC chip 14 on the element substrate 10, Thermal expansion becomes uneven, and the line head 1 is curved along the Y direction in the figure. In particular, the amount of deformation in the portion closer to the end of the element substrate 10 along the X direction is larger than that in the portion located from the center of the element substrate 10.

Therefore, if a plurality of light sources 72 are arranged in a straight line along the X direction on the element substrate 10, the plurality of light sources 72 are relative to each other along the Y direction according to the curvature of the element substrate 10. As shown in FIG. 9, in the region Rc near the center of the line head module 101, the light emission lines PLc of the plurality of light sources 72 and the center line CL of the lens array 60 are aligned along the Y direction. They will shift from each other.

Therefore, in the line head module 101 according to the present embodiment, the driving IC chip 14
In consideration of misalignment between the plurality of light sources 72 caused by the curvature of the element substrate 10 when the element substrate 10 is mounted, each light source 72 is mounted in advance before the driving IC chip 14 is mounted on the element substrate 10.
Are arranged at appropriate positions on the element substrate 10.

More specifically, as shown in FIG. 7, even if the line head is deformed due to the non-uniform distribution of the driving IC chips 14 in the line head 1 and the heat at the time of mounting, after the deformation, a plurality of Each of the plurality of light sources 72 is arranged such that a light emission line PL1 formed by connecting the centers of the plurality of light sources 72 is curved along the Y direction so that the light sources 72 are aligned in a straight line along the X direction. ing. As shown in FIG. 8, the respective positions of the plurality of light sources 72 on the element substrate 10 are such that the light emission line PL2 is aligned along the X direction after the element substrate 10 is curved along the Y direction. It is set in advance experimentally, theoretically or simulationally.

Accordingly, the relative positions along the Y direction of the plurality of light sources 72 are determined by the driving IC chip 14.
Is corrected in accordance with the curvature of the element substrate 10 that occurs when the element substrate 10 is mounted on the element substrate 10. Driving I
After the C chip 14 is mounted on the element substrate 10, as shown in FIG. 5, the plurality of light sources 72 are arranged in a straight line along the X direction.

In the line head module 101 in which the line head 1 and the lens array 60 are accurately positioned and assembled, when the line head module 101 is viewed from the upper side of the lens array 60 as shown in FIG. The light emission line PL2 of the light source 72 and the center line CL of the lens array 60 overlap.

Therefore, according to the line head 101, the light emitted from each of the plurality of light sources 72 is efficiently condensed through each of the plurality of gradient index lenses 60a. In addition, the image formed via the gradient index lens 60a located in the region Rc near the center of the line head module 101 is connected to the image via the gradient index lens 60a located in the region Re near the end. In the imaged image, there is almost no distortion caused by the shift of the light emitting line PL2 and the center line CL of the lens array 60. More specifically, on the imaging surface on the opposite side of the line head 1 with respect to the lens array 60, the light collected through each lens element is imaged at equal distances from the lens array. Therefore, for example, when the photosensitive drum or the like is exposed using the line head module 101 according to the present embodiment, a high-quality image with suppressed distortion can be formed.

Therefore, according to the line head module 101 according to the present embodiment, it is possible to perform high-quality image formation in which distortion is suppressed.

<2: Exposure apparatus>
Next, an exposure apparatus including the line head module according to the present embodiment will be described with reference to FIG. FIG. 10 is a schematic cross-sectional view schematically showing the configuration of the exposure apparatus. Such an exposure apparatus is an example of an electronic apparatus according to the present invention.

In FIG. 10, the exposure apparatus 200 includes the above-described line head module 101 and a photosensitive drum 1002 that is exposed by light from the line head module 101. More specifically, in the line head module 101, the light collected by the lens array 60 is imaged on the outer peripheral surface of the photosensitive drum 1002 for exposure. The photosensitive drum 1002 is configured to be exposed by the line head module 101 over the entire outer peripheral surface thereof by rotating in the direction indicated by the arrow R0 in FIG.

<3: Image forming apparatus>
Next, a printer as an example of an image forming apparatus including the exposure apparatus shown in FIG. 10 will be described with reference to FIG. FIG. 11 is a schematic cross-sectional view showing the main configuration of the printer. In the following description, a color printer including four types of exposure devices for yellow (Y), magenta (M), cyan (C), and black (K) will be described as an example. Such an image forming apparatus is also an example of the electronic apparatus of the present invention.

In FIG. 11, the printer includes four image forming units 1001Y, 101Y for YMCK.
01M, 1001C and 1001K, these units 1001Y, 1001M,
1001C and 1001K include a photosensitive drum 1002 and a line head module 1, respectively.
, An exposure apparatus including a cleaner 01, a cleaner 1011 disposed around the photosensitive drum, and a charger 101.
2, a developing device 1013 and a transfer roller 1014 are included. Four types of units 1001Y,
The transfer rollers 1014 provided in the respective 1001M, 1001C, and 1001K rotate along the driving direction of the transfer belt 1020 that is circulated and driven by the rotation of the rollers 1021, 1022, and the like. Further, the photosensitive drum 1002 in each of the units 1001Y, 1001M, 1001C, and 1001K is also rotationally driven in the direction of the arrow in FIG. 11 in synchronization with the driving of the transfer belt 1020.

After the toner remaining on the surface of the photosensitive drum 1002 is removed by the cleaner 1011,
A charger 1012 charges the outer peripheral surface of the photosensitive drum 1002 by corona discharge or the like.
Subsequently, an electrostatic latent image is formed on the outer peripheral surface of the photosensitive drum 1002 by exposure by the line head module 101. Subsequently, among Y, M, C, and K, four types of units 1001Y,
By using toners of colors corresponding to 1001M, 1001C, and 1001K, development is performed by the developing device 1013, and a toner image that is a visible image is formed on the surface of the photosensitive drum 1002 by toner adhesion.

On the other hand, the transfer belt 1020 is rotated by rollers 1021, 1022, and the like. Then, the toner image on the photosensitive drum 1002 is transferred onto the transfer belt 1020 while being pressed from the back side by the transfer roller 1014 at a transfer position facing each photosensitive drum 1002. The transferred toner image is further transferred onto a printing paper 1050 conveyed in the direction of the arrow in FIG. Subsequently, the toner image transferred onto the paper 1050 is fixed by being heated and pressed by the fixing device 1040. Fixing device 10
Reference numeral 40 includes a fixing roller 140 having a heat source and a pressure roller 240 pressed against the fixing roller 140. Then, the image-formed paper 1050 is discharged onto the discharge tray.

In addition to this, the line head module 101 according to the present embodiment can be applied to, for example, a printer of a cycle method, or an electronic device such as a copy, a facsimile, or a scanner.

The present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and a line head module with such a change. In addition, an electronic device including such a line head module is also included in the technical scope of the present invention.

It is sectional drawing which shows the structure of the line head module which concerns on this embodiment. It is a perspective view showing the arrangement | positioning relationship between a lens array and a line head in a line head module. It is a top view which shows typically the structure of the line head seen planarly on the board | substrate. It is a figure which shows the structure which concerns on the drive of each light source in a line head. FIG. 2 is an exploded perspective view showing a main part constituting the line head module 101. 2 is a plan view showing a specific configuration of a line head module 101. FIG. It is a conceptual diagram which shows the shape of the light emission line before mounting a driving IC chip. It is a conceptual diagram which shows the shape of the light emission line after mounting the IC chip for a drive. It is a top view which shows the positional relationship of the light emission line and center line in the comparative example of the line head module which concerns on this embodiment. 1 is a schematic cross-sectional view schematically showing a configuration of an exposure apparatus that is an example of an electronic apparatus according to the present invention. 1 is a schematic cross-sectional view illustrating a main configuration of a printer that is an example of an electronic apparatus according to the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Line head, 14 ... Driving IC chip, 72 ... Light source, 60 ... Lens array, 101 ... Line head module

Claims (6)

A line head having a substrate and a plurality of light sources arranged along a length direction of the substrate;
A lens array that is arranged to face the line head and has a plurality of lens elements arranged along the length direction,
A line head module that corrects relative positions of the plurality of light sources in the width direction of the line head before mounting a drive circuit unit for driving the light source on the line head. Each of the plurality of light sources, when the driving circuit unit is mounted on the line head,
Looking at the plurality of light sources from the direction along the length direction, a light emission line connecting the plurality of light sources and a center line connecting the centers of the plurality of lens elements overlap each other,
The line head module according to claim 1, wherein the line head module is disposed at a predetermined position on the substrate before the drive circuit unit is mounted. The drive circuit unit is a plurality of drive IC chips mounted on a region extending along one edge of a pair of edges extending along the length direction on the substrate. Line head module according to. The line head module according to any one of claims 1 to 3, wherein the lens element is a gradient index lens having different refractive indexes along a radial direction of the lens element. The plurality of light sources are configured using organic EL elements.
A line head module according to any one of the above. An electronic apparatus comprising the line head module according to any one of claims 1 to 5.

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