JP2021196481A - Display unit, electronic apparatus, and image forming device - Google Patents

Abstract

To provide a device that prevents leakage of light corresponding to a complicated shape of an exterior cover.SOLUTION: A display unit has: a substrate part that includes a light source that emits light; an exterior part that is attached to cover the substrate part; a first light shielding member that is provided to erect from a surface of the substrate part to cover a side direction of the light source; an optical member that is attached to a position opposite to the light source in the exterior part; and a second light shielding member that is provided to be located between the exterior part and the substrate part when the exterior part and the substrate part are attached.SELECTED DRAWING: Figure 4

Description

The present invention relates to display devices, electronic devices and image forming devices.

A display device provided with a touch panel display or the like is known as one of the operation devices for operating electronic devices such as an image forming device.
In such a display device, there is known a configuration in which a button that can be operated by illuminating a button or the like is displayed and visibility is improved.
In such a display device, for example, a method in which an LED is arranged on a substrate to illuminate a button to be operated is known. Since the light of such an LED is normally blocked by the exterior of the housing, the operator only needs to pay attention to the shining button, but a white exterior having particularly high light transmission is provided. In that case, the light emitted from the LED may be transmitted, and it may be detected as light leakage from the exterior.

As a method of preventing light leakage, a method of arranging a member having a high light-shielding property on the back surface side of the exterior of the housing, a method of forming an integral rib on the exterior cover, and the like are considered.
However, with either method, it is difficult to maintain the light leakage prevention performance at low cost while dealing with the complicated shape of the exterior cover.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device that prevents light leakage while dealing with a complicated shape of an exterior cover.

In order to solve the above-mentioned problems, the display device of the present invention comprises a substrate portion including a light source that radiates light, an exterior portion attached so as to cover the substrate portion, and the display device so as to surround the side surface direction of the light source. When the first light-shielding member provided so as to stand up from the surface of the substrate portion, the optical member attached to the exterior portion at a position facing the light source, and the exterior portion and the substrate portion are attached. It is characterized by having a second light-shielding member provided so as to be located between the exterior portion and the substrate portion.

According to the present invention, it is possible to prevent light leakage while dealing with a complicated outer cover shape.

It is a figure which shows an example of the whole structure of the image forming apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the structure of the display device shown in FIG. It is a figure which shows an example of the internal structure of the display device shown in FIG. It is a figure which shows an example of the aspect of attachment of a substrate part and a 1st light-shielding member. It is a figure which shows an example of the mode of assembling each member in the lighting part shown in FIG. It is a figure which shows an example when the 2nd light-shielding member is seen from the side where the light source is arranged. It is sectional drawing which shows an example of the positional relationship of the 1st light-shielding member and the 2nd light-shielding member in a state where an exterior part and a substrate part are attached. It is a figure which shows the comparative example of this invention. It is a figure which observed the light leakage in the comparative example shown in FIG. It is a figure which shows an example of the structure of the display device when a plurality of light sources are adjacent to each other. It is a figure which shows an example of the structure which concerns on other embodiment of this invention.

As an example of the embodiment of the present invention, FIG. 1 shows a schematic configuration of the display device 30.
As shown in FIG. 1, the display device 30 according to the first embodiment of the present invention is a display device provided in the image forming device 100 and having a function as an electronic device.

Hereinafter, embodiments according to the present invention will be sequentially described with reference to the drawings. In the embodiment, those having the same function and the same configuration are designated by the same reference numerals, and duplicate description will be omitted as appropriate. The drawings may be partially omitted or simplified to help understand the structure.

As shown in FIG. 1, the image forming apparatus 100 according to the present invention forms a sheet S as a recording medium, a paper feeding unit 3, and an image above the paper feeding unit 3 to form an image on the sheet. It has an image forming portion 2 of the above.
Above the image forming unit 2, a scanner 5 which is a document reading unit that optically-electrically converts and reads the original image is arranged, and on the left side of FIG. 1, which is the downstream side of the sheet S of the image forming unit 2 in the transport direction, A paper ejection tray 7 is provided to eject the sheet S on which the image is formed.
Further, on the right side of FIG. 1, which is the upstream side of the image forming unit 2 in the transport direction, a manual feed tray 8 for manually feeding the sheet S, which also serves as a cover for the image forming apparatus 100, is provided so as to be openable and closable.
The image forming apparatus 100 is a control unit that instructs and operates each part in the image forming apparatus 100 such as the image forming unit 2 based on the image data read from the scanner 5 or transmitted from a terminal such as a higher-level personal computer. It has a 90, a display device 30 for displaying an operating state of the control unit 90, and an operation unit 31 for instructing and operating the control unit 90 from a user.

The image forming unit 2 is provided with an intermediate transfer belt 9 which is an endless belt, and an image forming unit 10 for yellow (Y), magenta (M), cyan (C), and black (K), respectively. .. In the image forming unit 10, a plurality of drum-shaped photoconductors 11 provided for each color, and a charging device 12, a developing device 13, a cleaning device 14, and an exposure device 15 are arranged along the outer periphery of the photoconductor 11. ing.
The image forming unit 2 adds an intermediate transfer belt 9 which is an endless belt member, a transfer device 16 for transferring a color image formed on the intermediate transfer belt 9 to the sheet S, and a transferred toner image. It has a fixing device 17 that is fixed by pressing and heating.
The image forming unit 2 also temporarily stops the sheet S supplied from the manual feed tray 8 or the paper feeding unit 3, and sets the timing so that the positional relationship between the toner image and the tip of the sheet S becomes a predetermined positional relationship. It has a resist roller pair 19 that is sent out to the transfer device 16 in a timely manner.
The surface of the photoconductor 11 is charged by the charging device 12, and the image information read by, for example, the scanner 5 is latent in the surface of the photoconductor 11 by laser light in the exposure irradiation unit 15a which is irradiated with light by the exposure device 15. Written as an image.
Subsequently, the toner adheres to the electrostatic latent image written on the surface of the photoconductor 11 by the developing device 13 and is visualized. The cleaning device 14 removes and recovers the residual toner after being transferred to the intermediate transfer belt 9 described later from the photoconductor 11.

The toner images formed for each color on the photoconductor 11 are sequentially transferred onto the intermediate transfer belt 9, and the images of four colors are superimposed on the intermediate transfer belt 9 to form one color image.
The color image of the intermediate transfer belt 9 is transferred by the transfer device 16 from the paper feed unit 3 or to the sheet S suspended from the manual feed tray 8, pressurized and heated by the fixing device 17, and fixed as a color image. , The paper is discharged to the paper ejection tray 7 by the paper ejection roller 18.

The control unit 90 is a computer having a CPU (Central Processing Unit), a main memory (MEM-P), a north bridge (NB), a south bridge (SB), and the like.
The control unit 90 also has an AGP (Accelerated Graphics Port) bus, an ASIC (Application Specific Integrated Circuit), and a local memory (MEM-C).
The control unit 90 also has an HD (Hard Disk), an HDD (Hard Disk Drive), a PCI bus, and a network I / F.

The CPU processes and calculates data according to a program stored in the main memory, and controls the operation of each of the above-mentioned parts. The main memory functions as a storage area of the control unit 90, and stores programs and data that realize each function of the control unit 90. Alternatively, the program may be configured to record and provide a file in an installable or executable format on a computer-readable recording medium such as a CD-ROM, FD, CD-R, or DVD. ..

The local memory (MEM-C) is used as a copy image buffer and a code buffer. The HD is a storage for accumulating image data, accumulating font data used at the time of printing, and accumulating forms. The HDD controls reading or writing of data to the HD according to the control of the CPU. The network I / F transmits / receives information to / from an external device such as an information processing device via a communication network.

The control unit 90 operates as a communication control means for controlling bidirectional communication with a host device (for example, a personal computer) via a communication network or the like.
The control unit 90 also operates as an image data processing means for sending image data from the host device to the exposure device 15.

As shown in FIG. 2, the image forming apparatus 100 in the present embodiment is provided with a display device 30 integrated with the operation unit 31.
The display device 30 in the present embodiment includes an operation unit 31 which is a touch panel, a USB connector 32, a memory card reader 33, and a lighting unit 34 for indicating an energized state, a start state, and the like of the display device 30. ing.

As shown in the cross section of FIG. 3, the display device 30 includes an exterior cover 35 as an exterior portion, a substrate portion 36 which is a PCB substrate, and an LED 341 provided on the surface of the substrate portion 36, that is, the surface on the operation unit 31 side. It has a highly transparent lens unit 340 attached to the opposite surface of the LED 341, and an LCD 37 which is a liquid crystal display arranged between the operation unit 31 and the substrate unit 36.
The board portion 36 is fixed to the exterior cover 35 by front and rear brackets 38a and 38b.
Note that FIG. 3 is an example of a cross-sectional view taken along the line shown by the alternate long and short dash line in FIG.

The LCD 37 displays a program interface or the like for operating the image forming apparatus 100 from the control unit 90.
The user can give an instruction to the image forming apparatus 100 via the control unit 90 by operating the operation unit 31 while looking at the LCD 37.

The LED 341 is a light source that is attached to the substrate portion 36 and can be turned on in green to indicate ON, for example, when the display device 30 is operating properly.
The configuration of the color and the mode of lighting is not limited, and any light source that can be lit may be used, and other light sources may be used as long as they are not limited to LEDs.

The exterior cover 35, the substrate portion 36, the LED 341, and the lens portion 340 are attached as shown in FIGS. 4 and 5, respectively. As is clear from FIG. 5, a first light-shielding member 342 is provided on the side of the substrate portion 36 to which the LED 341 is attached so as to surround the side surface of the LED 341.
The lens portion 340 is a transparent optical member arranged opposite to the LED 341 and fitted in an opening formed in the exterior cover 35. That is, in the present embodiment, the lens portion 340 has a function as "an optical member attached to a position facing the light source in the exterior portion". In the present embodiment, the lens portion 340 is fitted into the opening of the exterior cover 35, but it may be fixed by press-fitting it into the second light-shielding member 352, and the fixing method thereof is limited. It's not something.

The first light-shielding member 342 is a light-shielding rib provided so as to stand up from the surface of the substrate portion 36 so as to surround the side surface direction of the LED 341, and in the present embodiment, the first light-shielding member 342 surrounds the periphery of the LED 341. It stands upright in a cylindrical shape. In the present embodiment, the first light-shielding member 342 is a cylindrical member mounted as a component on the PCB board, but it may be provided as a separate body or integrally provided on the PCB board. good. Further, in the present embodiment, the first light-shielding member 342 is a cylindrical member made of a light-shielding material such as black resin, metal, or ceramics, which is fixed to the substrate portion 36 with an adhesive, double-sided tape, or solder.
Further, the "light-shielding property" here refers to a property that shields the light from the LED 341 by a predetermined amount or more, and for example, a member having a thickness and a property that shields the light emitted by the LED 341 by 90% or more is selected. can do.

As shown in FIG. 5, the exterior cover 35 is integrated by fitting the front part covering the front surface of the substrate portion 36 and the rear part covering the back surface of the substrate portion 36, respectively, in the present embodiment. A built-in plastic cover that forms the housing.
In the present embodiment, the exterior cover 35 may be made of any material, but as will be described later, the present invention is in the case of a white or light-colored plastic material that easily transmits light from the LED 341. The effect of is higher.

As shown in FIG. 6, the second exterior cover 35 is provided so as to be located between the exterior cover 35 and the substrate portion 36 when the exterior cover 35 and the substrate portion 36 are attached to the inside of the exterior cover 35. A light-shielding member 352 is arranged.
As is clear from FIG. 6, the second light-shielding member 352 is fixed to the side of the exterior cover 35 to which the lens portion 340 is attached, and is a light-shielding member that does not easily transmit light.
The second light-shielding member 352 has a cylindrical protrusion 352a arranged so as to surround the outer side of the first light-shielding member 342 and a first light-shielding member 342 in a state where the exterior cover 35 and the substrate portion 36 are attached. It has a bottom portion 352b forming the bottom portion of the cylindrical protrusion 352a at a position facing the bottom portion 352b, and an opening portion 352c formed at a position facing the LED 341 at the center portion of the bottom portion 352b. ..
The second light-shielding member 352 is fixed to a protrusion provided inside the exterior cover 35 by press-fitting or heat caulking.

The light projected from the LED 341 as a light source passes through the opening 352c and the lens portion 340 for the upward component and is radiated to the outside of the display device 30.
On the other hand, among the components going upward, the light that has not passed through the opening 352c is blocked by the bottom portion 352b and the protrusion 352a of the second light-shielding member 352, so that the light does not pass to the outside of the display device 30.
Further, the light projected to the side of the LED 341 is blocked by the first light-shielding member 342 and does not pass to the outside of the display device 30.

In this way, the light from the LED 341 is generated by the first light-shielding member 342 standing so as to surround the periphery of the LED 341 and the second light-shielding member 352 formed on the opposite side of the LED 341 with the first light-shielding member 342 interposed therebetween. Of these, light that does not pass through the opening 352c is blocked.
With such a configuration, it is possible to prevent light leakage while corresponding to the complicated shape of the exterior cover 35.

Further, in the present embodiment, since the second light-shielding member 352 is arranged so as to cover the first light-shielding member 342, at least one of the first light-shielding member 342 and the protrusion 352a of the second light-shielding member 352. The portions are arranged so as to overlap in the Z direction shown in FIG. In other words, the first light-shielding member 342 and the second light-shielding member 352 are arranged so as to overlap each other in the height direction, which is the upright direction of the first light-shielding member 342.
In this way, the two first light-shielding members 342 and the second light-shielding member 352 are arranged so as to overlap each other in the Z direction, thereby further preventing light leakage from the gap between the light-shielding member and the exterior cover 35. be able to.

Further, in the present embodiment, in a state where the exterior cover 35 and the substrate portion 36 are attached, the figure is shown between the first light-shielding member 342 and the bottom portion 352b which is a surface facing the first light-shielding member 342. As shown by the broken line in 7, the first gap portion 343 is formed.
Similarly, a second gap portion 353 is formed between the lower end surface of the protrusion 352a of the second light-shielding member 352 and the substrate portion 36, as shown by a line.
Since the first light-shielding member 342 is formed so as to stand up from the substrate portion 36 and the protrusion 352a of the second light-shielding member 352 is formed so as to extend downward, the first gap is formed. The portion 343 and the second gap portion 353 are arranged so as to be located at different heights in the Z direction, which is the height direction of each other. As described above, between the first gap portion 343 formed between the first light-shielding member 342 and the surface facing the first light-shielding member, and between the second light-shielding member 352 and the surface facing the second light-shielding member. By arranging the formed second gap portion 353 at a different height, the light from the LED 341 will collide with the first light-shielding member 342 or the second light-shielding member 352 multiple times, so that the exterior cover 35 It becomes difficult to wrap around and transmit light, and the light transmitted through the exterior cover 35 can be further suppressed.

By the way, as a comparative example, simply providing a light-shielding member 60 around the LED 341 as a light source as shown in FIG. 8 may not sufficiently prevent light leakage due to light leakage from the side as shown in FIG. there were. Note that FIG. 9 is an example of photographing the state of light leakage seen through the exterior cover 35 when viewed from the direction shown as the A direction in FIG.
In order to prevent light leakage as shown by the alternate long and short dash line in FIG. 9, a method of closing the gap between the light-shielding member 60 and the substrate portion 36 or the exterior cover 35 as much as possible can be considered. If the distance between the board portion 36 and the light-shielding member 60 is reduced due to mounting or the standard of an external interface such as the USB connector 32, there is a risk that interference between parts may occur or the exterior cover 35 may be deformed. There is.

However, by providing the first gap portion 343 and the second gap portion 353 as in the present embodiment, the size of the first gap portion 343 and the second gap portion 353 is the size of the component of the substrate portion 36. Even if it is limited by a small amount or the like, it is possible to prevent the light from the LED 341 from leaking from the side as shown in FIG. 7.
Further, by arranging the positions of the first gap portion 343 and the second gap portion 353 at different heights in the Z direction, it is possible to prevent the light from the light source from leaking linearly and to prevent the light from leaking linearly from the LED 341. Since the light projected toward at least one of the first light-shielding member 342 and the second light-shielding member 352 is hit, the light-shielding property is further improved. In this way, by providing a plurality of gaps formed by the respective light-shielding members in a form such that the optical path from the LED 341 is not linear, light leakage can occur a plurality of times on the wall surface of the gap or the like. Since the diffused reflection is repeated, the leaked light is further attenuated, so that the intensity of the light can be weakened even if the light leaks.

Further, by arranging the two light-shielding members side by side in a concentric cylinder centered on the LED 341 in this way, the upper and lower fittings can be performed only by aligning the center positions of the two members, which is also required for alignment. The accuracy does not have to be so high.

Further, in the present embodiment, as shown in FIG. 10, a plurality of LEDs 341 are arranged on the surface of the substrate portion 36 to form the lighting portion 34.
When a plurality of LEDs 341 are arranged on the substrate portion 36 in this way, when one LED 341 is turned on, there is a possibility that the adjacent turned-off LEDs 341 may be mistakenly turned on due to light leakage.
Therefore, in the present embodiment, the first light-shielding member 342 and the second light-shielding member 352 are provided between the plurality of LEDs 341 adjacent to each other.
In this way, by providing the first light-shielding member 342 and the second light-shielding member 352 between the plurality of adjacent LEDs 341, it is possible to prevent misidentification due to light leakage of lighting of the two adjacent lens portions 340. ..

Further, in the present embodiment, the first light-shielding member 342 is formed in a cylindrical shape, but as shown in FIGS. 11A and 11B, the first light-shielding member 342 is arranged so as to surround the side surface portion of the LED 341. It may be in the shape of a rectangular cylinder, and is not limited to such a shape.
As shown in FIG. 11B, the gap between the first light-shielding member 342, the substrate portion 36, and the LED 341 is formed by forming a rectangular cylinder formed so as to cover the side surface portion along the shape of the LED 341. Light leakage from the can be further reduced.

Further, in the embodiment shown in FIG. 11, the cylindrical portion of the first light-shielding member 342 may be filled with a transparent optical material to form the lens portion 340.
In such a configuration, the "first light-shielding member is a wall surface integrated so as to surround the periphery of the light source". As described above, since the LED 341, the first light-shielding member 342, and the lens portion 340 are formed as an integrated module, it can be easily attached to, for example, the exterior cover 35.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to such a specific embodiment, and unless otherwise specified in the above description, the present invention described in the claims. Various modifications and changes are possible within the scope of the above.
For example, in the present embodiment, the case where the touch panel which is the operation panel of the image forming apparatus is used as a display device is shown, but the configuration is also used for a display device mounted on various electronic devices other than the image forming apparatus. good.

The effects described in the embodiments of the present invention merely list the most suitable effects resulting from the present invention, and the effects according to the present invention are limited to those described in the embodiments of the present invention. is not it.

30 Display device 36 Board part 35 Exterior part (exterior cover)
340 Optical member (lens part)
342 First light-shielding member 352 Second light-shielding member 343 First gap portion 353 Second gap portion 100 Image forming apparatus (electronic device)

Japanese Patent No. 4402962 Japanese Unexamined Patent Publication No. 2005-173403 Japanese Patent No. 6591736 Japanese Patent No. 38832729 Japanese Patent No. 6124390 Japanese Unexamined Patent Publication No. 2018-055005 Japanese Unexamined Patent Publication No. 2004-184671 Japanese Unexamined Patent Publication No. 2019-132640

Claims (8)

A board part equipped with a light source that radiates light,
An exterior part attached so as to cover the board part, and
A first light-shielding member provided so as to stand up from the surface of the substrate portion so as to surround the side surface direction of the light source.
An optical member attached to the exterior portion at a position facing the light source, and
A second light-shielding member provided so as to be located between the exterior portion and the substrate portion when the exterior portion and the substrate portion are attached.
A display device characterized by having. In the display device according to claim 1,
The display device is characterized in that the second light-shielding member is arranged on the opposite side of the light source with the first light-shielding member of the light source interposed therebetween in the side surface direction of the light source. In the display device according to claim 1 or 2.
The display device is characterized in that the first light-shielding member and the second light-shielding member are arranged so as to overlap each other in the height direction, which is the upright direction of the first light-shielding member. In the display device according to any one of claims 1 to 3.
A first void formed between the first light-shielding member and the exterior portion,
It has a second gap portion formed between the second light-shielding member and the substrate portion, and has.
A display device characterized in that the first gap portion and the second gap portion are formed so as to be located at different heights in the height direction. In the display device according to any one of claims 1 to 4.
A plurality of the light sources are arranged on the surface of the substrate portion, and the light sources are arranged on the surface of the substrate portion.
A display device characterized in that the first light-shielding member and the second light-shielding member are provided between the plurality of light sources that are adjacent to each other. In the display device according to any one of claims 1 to 5.
The first light-shielding member is a display device characterized by being an integrated wall surface so as to surround the periphery of the light source. An electronic device including the display device according to any one of claims 1 to 6. An image forming apparatus comprising the display device according to any one of claims 1 to 6.

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