Circuit board, projection device, and head-up display device

Abstract

To provide a circuit board, a projection device and a head-up display device capable of easily confirming whether or not a cable end is locked to a connector base.SOLUTION: The power source board 11B includes the flat plate-shaped board main body portion 12a, the connector base portion 12a which is mounted on the mounting surface of the board main body portion 18a and into which the cable end portion 91 is inserted, and the lock operation portion 18a which is configured to be capable of switching the state between the unlocked state in which the cable end portion 91 can be inserted into and removed from the connector base portion 18a and the locked state in which the cable end portion 91 cannot be pulled out from the connector base portion 18a in a state where the cable end portion 91 is inserted into the connector base portion 18b. 18b, A position is displaced between a position where a part of the lock operation part 12a can be visually recognized and a position where the lock operation part 12d cannot be visually recognized in a plan view from a normal line of the back side 18b of the board body part 18b.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a circuit board, a projection device, and a head-up display device. [Background technology]

[0002] The head-up display device described in Patent Document 1 includes first to third light source boards each consisting of a PCB (Printed Circuit Board) on which LEDs (Light Emitting Diodes) of different light colors are mounted, and a control unit that drives and lights each LED (see Figures 2 and 3, paragraphs 0014 and 0015 of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7443930 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, the connector base is mounted on the inner surface of each light source board, which is a surface that cannot be seen by an operator, and the end of the connection cable is inserted into this connector base and locked in place. With this configuration, it is difficult to check from the outside whether the end of the connection cable is locked into the connector base.

[0005] The present disclosure has been made in consideration of the above-described situation, and aims to provide a circuit board, a projection device, and a head-up display device that make it easy to check whether or not a cable end is locked to a connector base. [Means for solving the problem]

[0006] In order to achieve the above object, a circuit board according to a first aspect of the present disclosure comprises: a flat substrate main body; a connector base portion mounted on a mounting surface of the board body portion and into which a cable end portion is inserted; a lock operation unit configured to be able to switch between an unlocked state in which the cable end can be inserted into and removed from the connector base and a locked state in which the cable end cannot be pulled out from the connector base while the cable end is inserted into the connector base, By switching between the locked state and the unlocked state, the lock operation portion displaces between a position where a portion of the lock operation portion is visible and a position where the lock operation portion is not visible when viewed in a plan view from the normal to the back surface, which is the surface opposite the mounting surface of the board main body portion.

[0007] In order to achieve the above object, a projection device according to a second aspect of the present disclosure comprises: the circuit board further having a light source mounted on the mounting surface; a projection optical system that outputs the light emitted by the light source as projection light; a housing that houses the projection optical system therein and holds the circuit board with the back surface facing outward, When viewed from above, the lock operation portion is positioned so that a portion of the lock operation portion is visible in the locked state, and is a color different from that of the housing or the cable end portion located around the lock operation portion in the locked state.

[0008] In order to achieve the above object, a head-up display device according to a third aspect of the present disclosure includes: The projection device is provided to emit projection light, and a projection image is displayed by projecting the projection light from the projection device onto a projection target. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to easily check whether the cable end is locked to the connector base. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present disclosure. [Figure 2] 1 is a schematic diagram illustrating a configuration of a head-up display device according to an embodiment of the present disclosure. [Figure 3] 1 is a schematic cross-sectional view showing a portion of a projection device according to an embodiment of the present disclosure. [Figure 4] FIG. 2 is a schematic side view of a light source substrate according to an embodiment of the present disclosure. [Figure 5] FIG. 2 is a schematic rear view of a light source substrate according to an embodiment of the present disclosure. [Figure 6] FIG. 2 is a schematic front view of a light source substrate according to an embodiment of the present disclosure. [Figure 7] FIG. 2 is a schematic side view showing an enlarged view of a portion of a light source substrate according to an embodiment of the present disclosure. [Figure 8] FIG. 10 is a schematic rear view of a light source substrate before inserting a cable end according to an embodiment of the present disclosure. [Figure 9] FIG. 10 is a schematic rear view of the light source board in an unlocked state after insertion of a cable end according to an embodiment of the present disclosure. [Figure 10] FIG. 10 is a schematic front view of a light source substrate according to a modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] A circuit board, a projection device, and a head-up display device according to an embodiment of the present disclosure will be described with reference to the drawings.

[0012] 1, a head-up display device 100 is provided in a dashboard of a vehicle, and irradiates display light L representing a display image toward a windshield 2. A viewer 3 (mainly a driver) receives the display light L reflected by the windshield 2 and can visually recognize a virtual image V as a projected image.

[0013] As shown in FIG. 2, the head-up display device 100 includes a projection device 1, a folding mirror 70, a concave mirror 71, a housing 80, a mirror driver 72, a controller 50, and connection cables 90R, 90G, and 90B.

[0014] The folding mirror 70 and the concave mirror 71 are an optical relay that guides the display light L from the projection device 1 to the windshield 2. The folding mirror 70 reflects the display light L from the projection device 1 toward the concave mirror 71. The folding mirror 70 is a plane mirror or a free-form surface mirror. The concave mirror 71 reflects the display light L from the folding mirror 70 toward the windshield 2 while magnifying the light.

[0015] The mirror driver 72 rotates the concave mirror 71 around a rotation axis Ax under the control of the controller 50. The rotation axis Ax extends in the vehicle width direction. By rotating the concave mirror 71, the irradiation position of the display light L on the windshield 2 can be moved in the height direction.

[0016] The housing 80 is formed in a box shape from a light-blocking resin or metal. The housing 80 houses each component of the head-up display device 100. The housing 80 has an opening 80a formed on the surface facing the windshield 2, and the opening 80a is closed by a window 81 formed in a curved shape from a light-transmitting resin such as acrylic. The display light L passes through the window 81 from inside the housing 80 toward the windshield 2.

[0017] The projection device 1 includes an illumination device 10, an illumination optical system 20, a DMD (Digital Micro-mirror Device) element 30, a projection optical system 25, a screen 60, and a light box 19.

[0018] The light box 19 is formed in a box shape from a light-blocking resin or metal. The light box 19 houses the illumination device 10, the illumination optical system 20, the DMD element 30, the projection optical system 25, and the screen 60. The illumination device 10 emits illumination light C toward the illumination optical system 20. The specific configuration of the illumination device 10 will be described later.

[0019] The illumination optical system 20 is configured by, for example, a concave lens, and adjusts the illumination light C emitted from the illumination device 10 to a size corresponding to the DMD element 30.

[0020] The DMD element 30 includes movable micromirrors E arranged in a matrix. The micromirrors E can be switched on and off under the control of the control unit 50, thereby tilting within a range of ±12 degrees around a hinge (not shown) as a fulcrum. When the micromirror E is on, the micromirror E tilts +12 degrees around the hinge as a fulcrum, and reflects the illumination light C emitted from the illumination optical system 20 toward the projection optical system 25. When the micromirror E is off, the micromirror E tilts -12 degrees around the hinge as a fulcrum, and reflects the illumination light C in a direction different from that of the projection optical system 25. Therefore, the DMD element 30 projects only the display image D of the illumination light C toward the projection optical system 25 by individually driving each micromirror E.

[0021] The projection optical system 25 is configured with, for example, a concave lens or a convex lens, and efficiently irradiates the screen 60 with display light L corresponding to the display image D projected from the DMD element 30 .

[0022] The screen 60 is composed of a diffusion plate, a holographic diffuser, a microlens array, etc., and receives display light L from the projection optical system 25 on its lower surface and displays a display image D on its upper surface. As a result, display light L corresponding to the display image D is emitted from the screen 60.

[0023] The lighting device 10 includes light source substrates 11R, 11G, and 11B, a reflection-transmission optical unit 13, and a brightness nonuniformity reduction optical unit . As shown in FIG. 3, the light source substrates 11R, 11G, and 11B include light sources 12R, 12G, and 12B. The light source 12R is a red LED that emits red light R, the light source 12G is a green LED that emits green light G, and the light source 12B is a blue LED that emits blue light B. During the display period, the control unit 50 controls the light sources 12R, 12G, and 12B using a field sequential method in which one of the three light sources 12R, 12G, and 12B emits light and switches the emitting light source 12R, 12G, and 12B every predetermined time. The specific configuration of the light source substrates 11R, 11G, and 11B will be described later.

[0024] The reflection / transmission optical unit 13 generates illumination light C by combining the light R, G, and B. The reflection / transmission optical unit 13 is composed of a reflection mirror and a dichroic mirror, neither of which is shown.

[0025] As shown in FIG. 2, the brightness unevenness reduction optical unit 14 is composed of a mirror box, an array lens, etc., and diffusely reflects, scatters, and refracts the above-mentioned illumination light C to reduce light unevenness, and then outputs it to the illumination optical system 20.

[0026] As shown in FIG. 3, the light box 19 includes receiving holes 19R, 19G, and 19B formed as holes penetrating the light box 19, and a hook 19F on which the connection cable 90B is hooked. The accommodation hole 19B is formed in the side wall of the light box 19 and accommodates the light source 12B in its internal space. The opening of the accommodation hole 19B is closed from the outside by the light source substrate 11B. The accommodation hole 19R is formed in the bottom wall of the light box 19 and accommodates the light source 12R in its internal space. The opening of the accommodation hole 19R is closed from the outside by the light source substrate 11R. The accommodation hole 19G is formed in the bottom wall of the light box 19 and accommodates the light source 12G in its internal space. The opening of the accommodation hole 19G is closed from the outside by the light source substrate 11G.

[0027] 3, the hook 19F is L-shaped when viewed from the X direction, and the lower part of the hook 19F is positioned opposite the connector part 18 in the thickness direction of the light source substrate 11B. The lower part of the hook 19F supports a part of the connection cable 90B extending from the connector part 18 that is bent into a V shape.

[0028] Next, a specific configuration of the light source boards 11R, 11G, and 11B and a connection mode of the connection cables 90R, 90G, and 90B to the light source boards 11R, 11G, and 11B will be described. The three light source boards 11R, 11G, and 11B are independent circuit boards, and each has one corresponding light source 12R, 12G, or 12B mounted thereon.

[0029] The three connection cables 90R, 90G, and 90B are strip-shaped flexible flat cables that electrically connect the control unit 50 and each of the light source boards 11R, 11G, and 11B. Each of the connection cables 90R, 90G, and 90B is an electric line through which drive control signals for the light sources 12R, 12G, and 12B from the control unit 50 flow. The connection cables 90R, 90G, and 90B have cable end portions 91 which are connection terminals of the connection cables 90R, 90G, and 90B. Connector portions 18 (described later) of the light source boards 11R, 11G, and 11B are inserted into and connected to the cable end portions 91.

[0030] 8, multiple notches 91a are formed in the cable end 91. Two notches 91a are formed in a concave shape on the side surface of the cable end 91, and open to face opposite sides in the X direction. Each notch 91a is rectangular.

[0031] The configuration of the light source substrate 11B will be described below, but the other light source substrates 11R and 11G are configured in the same manner. As shown in FIGS. 3 to 6, the light source substrate 11B includes a light source 12B, a substrate main body portion 12a, and a connector portion .

[0032] In the following description, the longitudinal direction of the connector portion 18 is defined as the X direction, and the lateral direction of the connector portion 18 is defined as the Y direction. The substrate main body 12a is a PCB circuit board and has a generally rectangular plate shape that is short in the X direction and long in the Y direction. The substrate main body 12a has a mounting surface 12c and a back surface 12d. The mounting surface 12c is a surface that closes the opening of the accommodating hole 19B, and the light source 12B and the connector 18 are mounted on the mounting surface 12c. The light source 12B is located inside the accommodating hole 19B, and the connector 18 is located outside the accommodating hole 19B.

[0033] The connector 18 has a rectangular parallelepiped shape that is long in the X direction and is located at the end of the mounting surface 12c in the Y direction. The connector 18 is arranged along one of the four sides that surround the mounting surface 12c. The connector 18 is configured to be switchable between a locked state and an unlocked state when the cable end 91 is inserted. The connector portion 18 includes a connector base portion 18a mounted on the mounting surface 12c, and a lock operation portion 18b that is operated to switch between a locked state and an unlocked state when the cable end portion 91 is inserted.

[0034] 7, the connector base 18a is configured so that the cable end 91 can be inserted from the Y direction. The connector base 18a is formed of a resin that is a different color from the lock operation portion 18b, for example, a white or cream color.

[0035] The lock operation portion 18b has a rectangular plate shape that is long in the X direction, and is configured to be rotatable about a rotation axis J relative to the connector base portion 18a. As shown in Fig. 6, the rotation axis J extends in the X direction on the mounting surface 12c. The lock operation portion 18b is made of black resin. As shown in FIG. 7, when the lock operation portion 18b stands upright perpendicular to the Y direction, the connector portion 18 is in an unlocked state in which the cable end portion 91 can be attached to and detached from the connector base portion 18a. When lock operation portion 18b is rotated from this unlocked state around rotation axis J as shown by arrow A2 in Fig. 7, connector portion 18 enters a locked state in which cable end 91 inserted into connector base portion 18a cannot be removed. In this locked state, lock operation portion 18b is tilted in the Y direction to the opposite side from light source 12B as shown in Fig. 4, and engages with cable end 91 so that cable end 91 is prevented from coming off.

[0036] As shown in FIGS. 4 to 6, when the lock operation portion 18b is in the locked state, a portion of the lock operation portion 18b protrudes from the end face of the light source board 11B on the connector portion 18 side to the outside of the mounting surface 12c (to the lower side in FIGS. 4 to 6). In this locked state, when the light source board 11B is viewed from the rear surface 12d in a line of sight extending in the normal direction to the rear surface 12d as indicated by arrow B1 in FIG. 4, both outer portions in the X direction of the lower side of the lock operation portion 18b are visible through the cutout portions 91a, as shown in FIG. 5. In the X direction, the lock operation portion 18b is larger in size than the cable end portion 91. Therefore, the outer portions of the lock operation portion 18b in the X direction protrude outward in the X direction beyond the cutout portions 91a.

[0037] 7 and 8, when the lock operation portion 18b is in the unlocked state, the lock operation portion 18b is located closer to the center of the mounting surface 12c (upper side in FIGS. 4 to 6) than the end face of the light source board 11B on the connector portion 18 side. Therefore, in the unlocked state, the entire lock operation portion 18b is located so as to face the mounting surface 12c in the thickness direction of the light source board 11B. In this unlocked state, when the light source board 11B is viewed from above along a line of sight extending from the rear surface 12d side to the normal direction of the rear surface 12d as indicated by arrow B1 in FIG. 7, as shown in FIG. 9, a portion of the lock operation portion 18b is not visible within each cutout portion 91a, but the housing surface Hs visible through each cutout portion 91a is visible. The housing surface Hs is a part of the outer surface of the light box 19.

[0038] The cable end 91, the housing surface Hs, and the lock operation unit 18b are colored in different colors. The cable end 91 and the housing surface Hs are colored in colors that contrast highly with the lock operation unit 18b. High-contrast colors are, for example, black and white. For example, the cable end 91 is colored white, the lock operation unit 18b is colored black, and the housing surface Hs is colored gray. The cable end 91, the lock operation part 18b or the housing surface Hs may be colored not only by the color of the material itself but also by ink, printing or a sticker.

[0039] Next, a method for connecting the cable end 91 to the connector portion 18 of the light source substrate 11B will be described. This connection work is performed by a worker or a robot. As shown in FIGS. 7 and 8, before the cable end 91 is connected to the connector portion 18, the lock operation portion 18b is in an unlocked state. In this state, the cable end 91 is brought close to the connector base 18a and inserted as shown by arrow A1. This establishes electrical continuity between the cable end 91 and the connector base 18a. Thereafter, by rotating the lock operation portion 18b from this unlocked state as shown by arrow A2 in Figure 7, the cable end 91 is placed in a locked state where it cannot be removed from the connector portion 18, as shown in Figures 4 and 5. This completes the connection of the cable end 91 to the connector portion 18. The method for connecting the cable end 91 to the connector portion 18 of the light source boards 11R and 11G other than the light source board 11B is the same as above.

[0040] Next, a method for checking the connection state of the cable end 91 to the connector 18 will be described. This check is performed by visual inspection by an operator or by analyzing an image taken by a camera. This image analysis may be performed by a computer or by the operator. When the cable end 91 and the connector portion 18 are viewed or photographed from the direction of arrow B1 in Fig. 4, the color of the lock operation portion 18b can be seen through each cutout portion 91a as shown in Fig. 5. In this case, it can be confirmed that the connector portion 18 is in the locked state. On the other hand, when the cable end 91 and the connector unit 18 are viewed or photographed from the arrow B1 in Fig. 4, the color of the housing surface Hs can be seen through each cutout 91a as shown in Fig. 9. In this case, it can be recognized that the connector unit 18 is in the unlocked state. As described above, the connection state between the cable end 91 and the connector portion 18 can be easily confirmed from the rear surface 12d side by the color through each cutout portion 91a.

[0041] (effect) According to the embodiment described above, the following effects are achieved. (1) At least one of light source boards 11R, 11G, and 11B, which are examples of circuit boards, includes a flat board main body 12a, a connector base 18a mounted on a mounting surface 12c of the board main body 12a and into which a cable end 91 is inserted, and a lock operation unit 18b configured to be switchable between an unlocked state in which the cable end 91 can be inserted into and removed from the connector base 18a and a locked state in which the cable end 91 cannot be pulled out from the connector base 18a with the cable end 91 inserted into the connector base 18a. By switching between the locked state and the unlocked state, the lock operation unit 18b is displaced between a position where a portion of the lock operation unit 18b is visible and a position where the lock operation unit 18b is not visible in a plan view from the normal to a back surface 12d, which is the surface opposite to the mounting surface 12c of the board main body 12a. According to this configuration, whether or not the cable end 91 is locked to the connector base 18a can be easily confirmed from the rear surface 12d side by checking whether or not the lock operation portion 18b is visible.

[0042] (2) The projection device 1 includes light source substrates 11R, 11G, and 11B, each further having light sources 12R, 12G, and 12B mounted on a mounting surface 12c, a DMD element 30, a projection optical system 25, and a screen 60, which are examples of a projection optical system that outputs light emitted by the light sources 12R, 12G, and 12B as display light L, which is an example of projection light, and a light box 19, which is an example of a housing that houses the DMD element 30, the projection optical system 25, and the screen 60 and holds the back surface 12d facing outward. In a plan view, the lock operation unit 18b is colored a different color from the light box 19 or the cable end 91 located around the lock operation unit 18b in the locked state. With this configuration, it is possible to easily check whether the cable end 91 is locked to the connector base 18a based on the difference in color between the lock operation portion 18b and the light box 19 or the cable end 91. Specifically, there is no need to look into the mounting surface 12c side or insert a small camera into the mounting surface 12c side to check whether the cable end 91 is locked.

[0043] (3) The head-up display device 100 includes a projection device 1 that emits display light L, which is an example of projection light, and displays a virtual image V, which is an example of a projection image, by projecting the display light L from the projection device 1 onto a windshield 2, which is an example of a projected member. According to this configuration, in the head-up display device 100, it is possible to easily check whether the cable end portion 91 is locked to the connector base portion 18a.

[0044] (Variation) The above embodiment can be modified as follows. In the above embodiment, the connector portion 18 is arranged along one of the sides of the rectangular plate-shaped light source substrate 11B, but this is not limiting. As shown in FIG. 10 , the light source substrate 11B may have an inclined side 11L, which is one of the sides, and the connector portion 18 may be arranged along the inclined side 11L. The inclined side 11L is inclined and non-parallel to the opposing side 11M of the light source substrate 11B that faces the inclined side 11L. Even in this configuration, the lock operation portion 18b is formed to straddle the inclined side 11L when the connector portion 18 is in the locked state.

[0045] In the above embodiment, the hook 19F may be disposed at a position to support the connection cables 90R and 90G other than the connection cable 90B. In the above embodiment, it is possible to omit the plurality of notches 91a of the cable end 91. Even in this case, both ends of the lock operation portion 18b in the X direction are exposed to both outer sides of the cable end 91 in the X direction in the locked state. In the above embodiment, the cable end 91, the lock operation portion 18b, and the housing surface Hs are colored differently from one another, but any two of the cable end 91, the lock operation portion 18b, and the housing surface Hs may be the same color and the remaining one may be a different color. The cable end 91, the lock operation portion 18b, and the housing surface Hs may all be the same color. In the above embodiment, a portion of the lock operation part 18b is visible from the back surface 12c side in the locked state, and the lock operation part 18b is not visible from the back surface 12c side in the unlocked state. However, conversely, the lock operation part 18b may be visible from the back surface 12c side in the unlocked state, and the lock operation part 18b may not be visible from the back surface 12c side in the locked state.

[0046] In the above embodiment, the projection device 1 was a type equipped with a DMD element 30, but it is not limited to this type and may be of any type, for example, a type equipped with OLED (Organic Light Emitting Diodes), LCOS (Liquid Crystal On Silicon), etc.

[0047] In the above embodiment, the head-up display device 100 is mounted on a vehicle, but it may be mounted on a vehicle other than a vehicle, such as an airplane or a ship. Furthermore, the light source substrate in the above embodiment may be applied to a vehicle instrument other than the head-up display device 100, for example. The connector portion 18 and the cable end portion 91 in the above embodiment may be applied to a board other than the light source board, for example, a control board. [Explanation of symbols]

[0048] 1...Projection device 2...Windshield 3...Viewer 10...Lighting equipment 11R, 11G, 11B...light source substrate, 11L...inclined side, 11M...opposing side, 12R, 12G, 12B...light source, 12a...substrate main body, 12c...mounting surface, 12d...rear surface 13…Reflective / transmissive optical section 14...Brightness uniformity reduction optical unit 18...connector portion, 18a...connector base portion, 18b...lock operation portion 19...light box, 19R, 19G, 19B...accommodating hole, 19F...hook 20...Illumination optical system, 25...Projection optical system 30...DMD element 50...Control unit 60...screen 70...folding mirror, 71...concave mirror, 72...mirror drive unit 80...housing, 80a...opening, 81...window 90R, 90G, 90B...connection cables, 91...cable end, 91a...notch 100...Head-up display device R, G, B...light, C...illumination light, D...display image, E...micromirror, J, Ax...rotation axis, L...display light, V...virtual image, Hs...casing surface

Claims

1. a flat substrate main body; a connector base portion mounted on a mounting surface of the board body portion and into which a cable end portion is inserted; a lock operation unit configured to be able to switch between an unlocked state in which the cable end can be inserted into and removed from the connector base and a locked state in which the cable end cannot be pulled out from the connector base while the cable end is inserted into the connector base, By switching the state between the locked state and the unlocked state, the lock operation portion is displaced between a position where a part of the lock operation portion is visible and a position where the lock operation portion is not visible in a plan view from a normal line of a back surface that is the surface opposite to the mounting surface of the board main body portion. Circuit board.

2. The circuit board according to claim 1 , further comprising a light source mounted on the mounting surface; a projection optical system that outputs the light emitted by the light source as projection light; a housing that houses the projection optical system therein and holds the circuit board with the back surface facing outward, The lock operation portion is positioned so that a part of the lock operation portion is visible in the locked state in the plan view, and has a color different from that of the housing or the cable end portion located around the lock operation portion in the locked state. Projection device.

3. a projection device according to claim 2 that emits projection light, and a projection image is displayed by projecting the projection light from the projection device onto a projection target; Head-up display device.

Images