Display device for vehicle

Abstract

To provide a display device for a vehicle in which a frame and a case are bonded by an adhesive and the leakage of the adhesive is prevented.SOLUTION: A display device (100) for a vehicle is provided with a front surface cover (1), a display unit (2) arranged on the back surface side of the front surface cover (1) so as to face the front surface cover (1), a frame (3) for holding the front surface cover (1), a case (4) mounted to the frame (3), an adhesive material for bonding the frame (3) and the case (4), and a circuit board (6) contained in the case (4), wherein one of the frame (3) and the case (4) is provided, on the side facing the other, with a groove (31) along the outer edge thereof, the other is provided with a protrusion (41) at a position facing the groove (31), the adhesive material is provided between the groove (31) and the protrusion (41), and the one of the frame (3) and the case (4) is provided with a butting section (42) which contacts the other and positions the frame (3) and the case (4) in the facing direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a display device for a vehicle. [Background technology]

[0002] As a vehicle display device that displays vehicle information (for example, traveling speed and traveling distance) to a viewer, a vehicle display device that includes a frame that holds a surface cover and a case that houses a circuit board, and the frame and the case are fixed together, is known. For example, in the vehicle display device disclosed in Patent Document 1, a resin case with a protrusion is inserted into a resin frame with a groove, and the case is bonded and fixed with an adhesive. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-30828 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle display device disclosed in Patent Document 1, a resin case is pressed into a resin frame to adhere during assembly. During this process, depending on how tightly the case is pressed, adhesive may overflow and leak from the groove. Furthermore, if the frame or case is temporarily or permanently deformed by the force applied during the pressing, adhesive may overflow and leak from the groove. Overflowing and leaking adhesive from the groove reduces the amount of adhesive in the groove, potentially resulting in defects in adhesion and other functions. Furthermore, if adhesive leaks from the groove and leaks outside the vehicle display device, the appearance of the vehicle display device is impaired.

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle display device in which a frame and a case are bonded with an adhesive, in which leakage of the adhesive is prevented. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides: A surface cover and a display unit disposed on the rear surface side of the surface cover so as to face the surface cover; a frame for holding the surface cover; a case attached to the frame; an adhesive that bonds the frame and the case; a circuit board accommodated in the case; A vehicle display device comprising: one of the frame and the case has a groove portion along an outer edge on a side facing the other, and the other has a protrusion portion at a position facing the groove portion; the adhesive is provided between the groove and the protrusion, The present invention provides a vehicle display device including a stopper portion where one of the frame and the case comes into contact with the other to position the frame and the case in the opposing direction. [Effects of the Invention]

[0007] According to the present invention, a vehicle display device in which a frame and a case are bonded with an adhesive is provided, in which leakage of the adhesive is prevented. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a vehicle display device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a front view showing a frame of the vehicle display device of FIG. [Figure 3] FIG. 3 is a front view showing a case of the vehicle display device of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 5 is an enlarged view of region C in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] In the drawings, the scale and aspect ratios have been changed as appropriate to facilitate understanding, and detailed structures and some components (for example, connecting means and fixing means) have been omitted. Also, in the drawings, for ease of viewing, only some of the reference symbols may be assigned to multiple parts with the same attribute, or a symbol assigned in one drawing may be omitted in another drawing.

[0011] In this specification, terms specifying shapes and geometric conditions and their degrees (e.g., "polygon," "center," "plate," "face," "plane," "flat," "rectangular prism," and "parallel"), directions, etc. are interpreted without being bound by strict meanings, but rather to include the range of degrees to which similar functions can be expected.

[0012] Fig. 1 is a front view showing a vehicle display device 100 according to one embodiment of the present invention. Fig. 2 is a front view showing a frame 3 of the vehicle display device 100 of Fig. 1. Fig. 3 is a front view showing a case 4 of the vehicle display device 100 of Fig. 1. Fig. 4 is a diagram showing a cross-sectional view taken along line AA in Fig. 1. Fig. 5 is an enlarged view of area C in Fig. 4. Fig. 6 is a diagram showing a cross-sectional view taken along line BB in Fig. 1.

[0013] The vehicular display device 100 is mounted on vehicles such as motorcycles, four-wheeled motor vehicles, agricultural work vehicles, construction work vehicles, and trains. The vehicular display device 100 displays vehicle information (e.g., traveling speed and distance traveled), and is installed so that a vehicle user (viewer) can view the display through the surface cover 1. In the following description, the side on which the display of the vehicular display device 100 is viewed by the viewer (the surface cover 1 side of the vehicular display device 100) is referred to as the "front (front side)," and the opposite side is referred to as the "rear (back side)." Furthermore, when the vehicular display device 100 is viewed from the front, the direction toward the center along the main surface of the surface cover 1 is referred to as the "inner side," and the direction away from the center along the main surface of the surface cover 1 is referred to as the "outer side."

[0014] The vehicle display device 100 comprises a surface cover 1, a display unit 2 arranged opposite the surface cover 1 on the back side of the surface cover 1, a frame 3 that holds the surface cover 1, a case 4 attached to the frame 3, an adhesive 5 that bonds the frame 3 and the case 4, and a circuit board 6 housed in the case 4.

[0015] The surface cover 1 protects the surface of the display unit 2 from impacts and prevents water, dust, and the like from entering the interior of the vehicle display device 100. As shown in FIG. 1, the surface cover 1 is a flat member with a substantially octagonal main surface. The surface cover 1 has a display area (light-transmitting area) on its main surface where the display is visible to the viewer, and is made of a transparent synthetic resin material or inorganic glass. The front surface of the surface cover 1 may be coated with a coating or film that has functions such as anti-reflection, anti-fouling, anti-static, and infrared blocking. A display frame that limits the display area, a warning design, and the like are printed on the back surface of the display cover 1.

[0016] As shown in FIG. 4, the display unit 2 is disposed on the rear surface of the front cover 1, facing the front cover 1, and is bonded to the rear surface of the front cover 1 by optical bonding. The display unit 2 is, for example, a digital display device that displays vehicle information, and functions, for example, as an odometer that indicates the mileage using a displayed image, or a speedometer that indicates the vehicle speed. The display unit 2 includes a liquid crystal display or an organic EL display. The display unit 2 is controlled by a circuit board 6, and is connected to the circuit board 6 by, for example, a flexible printed circuit board. The display unit 2 is also fixed to the case 4 and the circuit board 6 by fixing means such as screws (not shown).

[0017] An example of a configuration in which the display unit 2 includes a liquid crystal display will be described. The display unit 2 includes a liquid crystal display element, a light source substrate, and a housing that houses them. Examples of liquid crystal display elements include TFT (Thin Film Transistor) liquid crystal displays formed by sealing liquid crystal molecules between a pair of glass substrates and segment-type liquid crystal displays. The light source substrate is, for example, a substrate on which LEDs (Light Emitting Diodes) that illuminate the liquid crystal display element are mounted, and serves as a backlight for the liquid crystal display element. The light source substrate is disposed on the back side of the liquid crystal display element. The display unit 2 may include a light guide member to spread light from the LEDs over the entire surface of the liquid crystal display element. The light guide member includes a light guide plate, a reflector provided on the back side of the light guide plate, and a diffuser provided on the front side of the light guide plate. The housing is, for example, a resin or metal housing that houses the liquid crystal display element and the light source substrate.

[0018] 4, the frame 3 holds the surface cover 1 and houses the display unit 2 in the space formed by the frame 3 and the surface cover 1. The frame 3 is a resin molded part with light-blocking properties, and is made of, for example, a thermoplastic resin such as AES (acrylonitrile ethylene styrene), ABS (acrylonitrile butadiene styrene), or PP (polypropylene).

[0019] As shown in FIG. 2, the frame 3 has a substantially octagonal shape in a front view that is substantially the same as the substantially octagonal shape of the surface cover 1. As shown in FIGS. 2 and 4, the frame 3 has a thin plate-like portion that includes a flat surface facing the outer rear surface of the surface cover 1 (hereinafter simply referred to as the flat surface facing the surface cover 1) and a flat surface facing the back side of the display unit 2 (hereinafter simply referred to as the flat surface facing the display unit 2). The thin plate-like portion has a ￣|_|￣ shape ("￣" represents the flat surface facing the surface cover 1, and "_" represents the flat surface facing the display unit 2), in which the flat surface facing the display unit 2 is recessed from the flat surface facing the surface cover 1 toward the back side. A warning box is provided on the flat surface facing the surface cover 1 at a position corresponding to the warning design on the surface cover 1.

[0020] As shown in FIGS. 4 and 5 , the frame 3 is bonded to the surface cover 1 on a plane facing the surface cover 1, thereby holding the surface cover 1 in place. Known bonding methods can be used, such as double-sided tape 7 containing known adhesive components (e.g., acrylic resin and epoxy resin). The double-sided tape 7 is attached to the area of ​​the surface of the frame 3 facing the surface cover 1 where the warning box is not provided, and adheres to the area outside the display area on the back surface of the surface cover 1. The frame 3 and the surface cover 2 may be bonded all around or partially at multiple locations. Bonding the frame 3 and the surface cover 2 all around improves the airtightness and liquid-tightness of the bonded area between the frame 3 and the surface cover 2, thereby more reliably preventing the intrusion of water, dust, and the like. In this specification, the term "bonding" encompasses the concept of "adhesion."

[0021] 4, the frame 3 houses the display unit 2 in a space sandwiched between the flat surface of the frame 3 facing the display unit 2 and the surface cover 1. A cutout area (not shown) that runs through the front and back of the thin plate-like portion is provided in the thin plate-like portion of the frame 3. As described above, the display unit 2 is connected to the circuit board 6 via the cutout area by connecting means (not shown), and is fixed to the case 4 and the circuit board 6 by fixing means (not shown), such as screws.

[0022] A circular groove 31 is provided on the back side of the frame 3, running around the outer edge. When assembling the vehicle display device 100, an adhesive 5 is inserted into the groove 31. As shown in FIG. 5 , the groove 31 in this embodiment has a bottom surface on the side of the thin plate portion opposite the flat surface facing the surface cover 1, and is formed by the bottom surface and two protruding structures that protrude from the bottom surface toward the case 4 and run around the outer periphery (i.e., a first protruding structure that is also the outer peripheral wall of the frame 3 and a second protruding structure formed inside the outer peripheral wall along the outer peripheral wall). As a variation of this embodiment, the groove 31 may be formed by recessing the surface of the thin plate portion opposite the flat surface facing the surface cover 1 toward the surface cover 1.

[0023] 2 and 6, the frame 3 may have a plurality of locking portions 32 that lock the case 4. The locking portions 32 will be described later together with locked portions 44 that the case 4 may have.

[0024] 4, case 4 is attached to frame 3 and houses circuit board 6. Case 4 is a resin molded part with light-blocking properties, and is made of, for example, a thermoplastic resin such as AES (acrylonitrile ethylene styrene), ABS (acrylonitrile butadiene styrene), or PP (polypropylene).

[0025] 3 and 4, the general shape of the case 4 is a flat, bottomed, octagonal cylinder with a substantially octagonal opening on the front side. The case 4 has an annular protrusion 41 that protrudes forward from the outer edge of the case 4 and runs around the outer edge, and a plurality of abutment portions 42 that protrude forward from the inside of the protrusion 41.

[0026] 3 to 5, the protrusions 41 are provided at positions facing the grooves 31 of the frame 3. When assembling the vehicle display device 100, the adhesive 5 is loaded into the grooves 31 of the frame 3, and then the protrusions 41 are inserted into the grooves 31 into which the adhesive 5 has been loaded. As a result, the grooves 31 of the frame 3 and the protrusions 41 of the case 4 are bonded together by the adhesive 5.

[0027] As shown in FIGS. 3 to 5 , the abutment portion 42 is a rib that is provided near the protrusion portion 41 on the inner side of the protrusion portion 41 and protrudes forward toward the frame 3. The protrusion portion 41 and the abutment portion 42 are formed so as to be continuous with each other by a flat plate portion 43 provided between the protrusion portion 41 and the abutment portion 42. The flat plate portion 43 structurally reinforces the abutment portion 42 to prevent deformation. The abutment portion 42 may be a rib having a substantially rectangular parallelepiped shape, a rib having a cross-shaped cross section, or any other shape. The abutment portion 42 contacts the frame 3 at its tip and determines the position of the case 4 in the facing direction relative to the frame 3. Therefore, in this embodiment, when the front end of the flat plate portion 43 is used as a reference, the protruding length of the abutment portion 42 is slightly longer than the protruding length of the protrusion portion 41.

[0028] The position of the case 4 in the opposing direction relative to the frame 3 is determined by the abutment portion 42, so that when the protrusion portion 41 is inserted into the groove portion 31 during assembly of the vehicle display device 100, the insertion degree of the protrusion portion 41 is constant regardless of the amount of force used to press the case 4 into the frame 3. This makes it possible to prevent the adhesive 5 from leaking from the groove portion 31 into which a predetermined amount of adhesive 5 has been charged.

[0029] Furthermore, when the worker manually inserts the protrusions 41 into the grooves 31, the abutment portions 42 abut against the frame 3, allowing the worker to understand that there is no need to push the case 4 any further into the frame 3. As a result, the worker will not push the case 4 excessively into the frame 3. This prevents the frame 3 and the case 4 from being temporarily or permanently deformed by excessive force applied when they are pushed in, and prevents leakage of the adhesive 5 due to deformation of the frame 3 and the case 4.

[0030] Furthermore, the second moment of area and section modulus near the position where the abutment portion 42 is provided in the case 4 are larger than when the abutment portion 42 is not provided, resulting in increased strength. At the same time, the abutment portion 42 is structured to support the surface of the frame 3 that contacts the abutment portion 42, so strength is also increased near the contact position. As a result, temporary or permanent deformation of the frame 3 and the case 4 due to the force applied when the frame 3 and the case 4 are pressed in can be prevented, and leakage of the adhesive 5 due to deformation of the frame 3 and the case 4 can be prevented. For the same reason, the frame 3 has a structure that is less likely to undergo thermal deformation when the vehicle display device 100 is mounted and used in a vehicle, even when the vehicle is exposed to hot sunlight or a high-temperature environment.

[0031] If the frame 3 is deformed, particularly when the vehicle display device 100 is mounted on a vehicle and used, if thermal deformation occurs at the attachment position of the frame 3 with the double-sided tape 7, poor adhesion, such as peeling of the double-sided tape 7, may occur. As shown in FIG. 5 , in this embodiment, the double-sided tape 7 and the contact position of the frame 3 and the case 4 by the abutment portion 42 are arranged to face each other across the frame 3. Therefore, for the same reasons as above, the attachment position of the double-sided tape 7 on the frame 3 is structured to be particularly resistant to deformation. This prevents poor adhesion of the double-sided tape 7 due to deformation of the frame 3, particularly thermal deformation, and prevents water, dust, and the like from entering the vehicle display device 100 due to poor adhesion of the double-sided tape 7.

[0032] 6, the case 4 may include a locked portion 44 that is locked by the locking portion 32. The locked portion 44 is provided at a position corresponding to the locking portion 32. In this embodiment, the locking portion 32 and the locked portion 44 are locked together by a snap fit method, but the method is not limited thereto, and they may be locked together by a press fit method, for example.

[0033] Specifically, as shown in FIGS. 2, 3, and 6, the locking portion 32 is formed as a rectangular through-hole in the frame 3, and the locked portion 44 has a structure including an elastic arm and a hook-shaped holding portion that hooks onto the locking portion 32. During assembly of the vehicle display device 100, as the case 4 is pushed into the frame 3 (i.e., the protrusion 41 is inserted into the groove 31), the locked portion 44 approaches the locking portion 32 while bending the arm due to elastic deformation. When the hook-shaped holding portion located at the tip of the locked portion 44 reaches the locking hole of the locking portion 32, the hook-shaped holding portion enters the locking hole, and the locked portion 44 is held by being hooked onto the locking portion 32 by the hook-shaped holding portion. This strengthens the fixation between the frame 3 and the case 4 and prevents misalignment between the frame 3 and the case 4 during assembly of the vehicle display device 100 until the adhesive 5 is completely hardened.

[0034] The circuit board 6 is configured by printing various wirings on an insulating plate-shaped substrate made of, for example, glass epoxy resin. The circuit board 6 is disposed behind the display unit 2 so as to be substantially parallel to the rear surface of the display unit 2 and is fixed to the case 4 by a fixing means (not shown). The circuit board 6 is also connected to the display unit 2 and external devices by a connecting means (not shown). The circuit board 6 mainly includes a control unit for controlling the display unit 2. The control unit includes a central processing unit (CPU), read-only memory (ROM), random access memory (RAM), etc., and executes predetermined arithmetic processing according to, for example, a program written in the ROM. The control unit acquires, for example, vehicle speed, engine RPM, various vehicle information, navigation information, etc. from the vehicle's electronic control unit (ECU) via various sensors, etc. The control unit displays information on the display unit 2 based on the acquired information.

[0035] The present invention is not limited to the above-described embodiments and drawings, and modifications (including the omission of components) can be made as appropriate within the scope of the present invention.

[0036] In the above description, in order to facilitate understanding of the present invention, descriptions of well-known technical matters have been omitted as appropriate.

[0037] The present invention includes the following embodiments. [1] Surface cover and a display unit disposed on the rear surface side of the surface cover so as to face the surface cover; a frame for holding the surface cover; a case attached to the frame; an adhesive that bonds the frame and the case; a circuit board accommodated in the case; A vehicle display device comprising: one of the frame and the case has a groove portion along an outer edge on a side facing the other, and the other has a protrusion portion at a position facing the groove portion; the adhesive is provided between the groove and the protrusion, The vehicle display device includes a stopper portion where one of the frame and the case comes into contact with the other to position the frame and the case in a direction in which they face each other. [2] The vehicle display device of [1], wherein the abutment portion is located near the protrusion portion. [3] The surface cover is held to the frame by double-sided tape; A vehicle display device according to [1] or [2], wherein the adhesion position of the surface cover and the frame by the double-sided tape and the contact position of the frame and the case by the abutment portion are arranged so as to face each other across the frame. [4] A vehicle display device according to any one of [1] to [3], wherein the frame and the case have a locking means consisting of a locking portion and a locked portion, and one of the frame and the case has the locking portion, and the other has the locked portion that is locked by the locking portion. [Explanation of symbols]

[0038] 100 Vehicle display device 1. Surface cover 11...Display section 2. Display unit 3. Frame 31 Groove 32 Locking portion 4. Case 41...Protrusion section 42. Stop part 43...Flat plate part 44...Locked part 5...Adhesive material 6. Circuit board 7. Double-sided tape

Claims

1. A surface cover and a display unit disposed on the rear surface side of the surface cover so as to face the surface cover; a frame for holding the surface cover; a case attached to the frame; an adhesive that bonds the frame and the case; a circuit board accommodated in the case; A vehicle display device comprising: one of the frame and the case has a groove portion along an outer edge on a side facing the other, and the other has a protrusion portion at a position facing the groove portion; the adhesive is provided between the groove and the protrusion, The vehicle display device includes a stopper portion where one of the frame and the case comes into contact with the other to position the frame and the case in a direction in which they face each other.

2. The display device for a vehicle according to claim 1 , wherein the abutment portion is located near the protrusion portion.

3. the surface cover is held to the frame by double-sided tape; The vehicle display device according to claim 1 , wherein the double-sided tape and a contact position between the frame and the case by the abutting portion are arranged to face each other across the frame.

4. 2. The vehicle display device according to claim 1, wherein the frame and the case have a locking means consisting of a locking portion and a locked portion, and one of the frame and the case has the locking portion and the other has the locked portion that is locked by the locking portion.

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