JP7100818B2 - Head-up display device - Google Patents

Description

The present invention relates to a head-up display device.

A head-up display (HUD: Head-Up Display) device that displays a virtual image so as to be superimposed on a real scene is known. For example, the HUD device disclosed in Patent Document 1 includes a light source unit that emits display light, a reflector that guides the display light from the light source unit to the windshield, and a case body that houses the light source unit and the reflector. It is provided outside the case body and includes a control board for controlling the light source unit.

Japanese Unexamined Patent Publication No. 2016-45388

In the HUD device described in Patent Document 1, the control board is provided outside the case body. Therefore, the size of the HUD device has increased.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a small head-up display device.

The means for achieving the above objectives are as follows.
It ’s a head-up display device.
With the lower case
An upper case that is attached to the lower case and forms a housing together with the lower case,
The display fixed to the lower case and
An optical system housed in the lower case and guiding the light emitted by the display to the projected member, and
A control board on which an external light sensor is mounted and
A screw, which secures the control board to the lower case, is provided.
The control board is provided between the top surface of the upper case and the upper surface of the display .
The screw comprises a head that is exposed to the outside when the upper case is removed from the head-up display device.

According to the head-up display device of the present invention, it is possible to provide a small-sized head-up display device.

It is a schematic diagram of the head-up display device which concerns on embodiment of this invention. FIG. 3 is a cross-sectional view of the head-up display device shown in FIG. 1 cut in an xz plane at a position where a display can be seen. It is a perspective view of the lower case of the head-up display device shown in FIG. It is a bottom view of the upper case of the head-up display device shown in FIG. FIG. 3 is a cross-sectional view of the head-up display device shown in FIG. 1 cut in an xz plane at a position where the surroundings of an external light sensor can be seen. It is a top view which removed the upper case, the control board and the plane mirror holding member of the head-up display device shown in FIG. FIG. 3 is an enlarged perspective view around a concave mirror with the upper case of the head-up display device shown in FIG. 1 removed. FIG. 3 is a plan view of the head-up display device shown in FIG. 1 with the upper case removed. (A) is a perspective view of a lower case in which a plane mirror and a plane mirror holding member of the head-up display device shown in FIG. 1 are arranged, and (b) is the same plan view. FIG. 3 is a cross-sectional view in which the upper case of the head-up display device shown in FIG. 1 is removed and the display surface of the display is cut along the xz plane.

Hereinafter, the head-up display device (hereinafter referred to as “HUD device”) according to the embodiment of the present invention will be described with reference to the drawings. In the description, the up / down / front / back / left / right and x, y, z axes follow the arrows in each figure.

As shown in FIG. 1, the HUD device 100 according to the present embodiment is mounted in, for example, a dashboard of the vehicle 300 (not shown) and emits display light L toward the windshield 200 which is a projected member of the vehicle 300. .. The viewer U, who is the driver, receives the display light L reflected by the windshield 200 and visually recognizes the virtual image V seen through the windshield 200.

As shown in FIGS. 2 and 5, the HUD device 100 includes a housing 110, a display 120, a plane mirror 130, a concave mirror 140, a control board 150, an external light sensor 160, a light guide body 170, and the like. A plane mirror holding member 180 for holding the plane mirror 130 is provided. The HUD device 100 emits the display light L from the display 120 to the plane mirror 130, reflects the display light L by the plane mirror 130, and then reflects the display light L by the concave mirror 140. The display light L reflected by the concave mirror 140 passes through the opening 113 of the upper case 111, which will be described later, of the housing 110, and is reflected by the windshield 200.

The housing 110 is formed of, for example, a black synthetic resin. The housing 110 includes a lower case 112 formed in a box shape that opens upward, and an upper case 111 that is mounted on the upper part of the lower case 112 so as to close the lower case 112 from above.
As shown in the cross-sectional views of FIGS. 2 and 5 and the bottom view of FIG. 4, the upper case 111 is provided with an opening 113 for passing the display light L reflected by the concave mirror 140. A translucent cover 114 is arranged so as to cover the opening 113. The cover 114 is laser welded to, for example, the opening 113. The upper case 111 has a light-shielding wall 115 between the opening 113 and the display 120. The light-shielding wall 115 prevents a phenomenon (washout) in which sunlight is incident on the display 120 from the opening 113 and the virtual image V becomes difficult to see.

As shown in FIGS. 2 and 5, the lower case 112 accommodates a plane mirror 130, a concave mirror 140, and the like. Further, the lower case 112 is formed with a housing portion 112a. The display 120 and the heat radiation fin 117 are housed in the housing portion 112a. The lower case 112 includes a control board mounting portion 116 that forms an upper plate of the accommodating portion 112a. The control board mounting portion 116 is located above the bottom surface 112b of the lower case 112. The control board mounting portion 116 is provided for mounting the control board 150 on the upper surface thereof.

As shown in the plan view of FIG. 3, the lower case 112 has partition walls 119a and 119b hanging from the control board mounting portion 116 to the bottom surface 112b of the lower case 112 on the rear left side. The control board mounting portion 116 and the partition walls 119a and 119b form a housing portion 112a for accommodating the display 120 and the heat radiation fins 117. As shown in FIG. 2, the partition wall 119a is integrally formed with the wall surface around the projection lens 121 of the display 120. As shown in FIG. 3, the partition wall 119a is formed with a window portion 192 through which the display light L emitted from the display 120 is passed.

The lower case 112 further has a pair of bearings 118a, 118b in front of it to receive the pair of shafts 141a, 141b of the concave mirror 140. The pair of bearings 118a and 118b are located apart from each other so as to sandwich the concave mirror 140 in the longitudinal direction thereof. The pair of bearings 118a and 118b have first and second bearing holes 190a and 190b forming a semi-cylindrical shape. A large diameter portion receiver 191a is formed in the center of the first bearing hole 190a in the longitudinal direction. The large diameter portion receiver 191a forms a semicircular ring along the circumferential direction of the first bearing hole 190a. The large diameter portion 145a of the shaft 141a, which will be described later, is fitted to the large diameter portion receiver 191a.

The lower case 112 has a plane mirror fixing portion 112c at the lower right rear thereof. The plane mirror fixing portion 112c has a recess 112h for fixing the lower end portion of the plane mirror 130 on the bottom surface 112b of the lower case 112. The lower case 112 is fixed to the upper case 111 by engaging the hooks 111a, 111b, 111c, 111d of the upper case 111 shown in FIG. 4 in the locking holes 112d, 112e, 112f, 112g shown in FIG. Will be done. The lower case 112 and the upper case 111 form a housing 110.

As shown in FIG. 2, the display 120 modulates the backlight that emits light and the light from the backlight according to the image signal from the control unit to generate a display light L that represents an image. It includes a Millor Device) element and a projection lens 121 that magnifies the generated display light L. As shown in FIG. 6, the display 120 at the lower left rear of the lower case 112 emits the display light L indicating the display image to the plane mirror 130 at the lower right rear of the lower case 112. The display 120 is fixed to the accommodating portion 112a at the lower left rear of the lower case 112, and the periphery of the display 120 is covered with the heat radiation fins 117. The heat radiation fin 117 is exposed to the outside of the HUD device 100 in order to dissipate the heat of the display 120. The display light L is not limited to the DMD element, but may be a liquid crystal panel.

As shown in FIG. 10, the display surface 123 of the display 120 is arranged diagonally upward so as to form an acute angle A with respect to the extension line E of the blind portion 181. An image is displayed on the display surface 123 of the display device 120, and the display light L is emitted from the display surface 123.

As shown in FIG. 5, the plane mirror 130 is a substantially rectangular plate-shaped body. As shown in FIG. 6, the plane mirror 130 reflects the display light L incident from the display 120 at the lower left rear of the lower case 112 to the concave mirror 140 at the front of the lower case 112. The plane mirror 130 has a metal reflective film formed on one surface of a flat plate-shaped base material made of synthetic resin, glass, or the like. The plane mirror 130 reflects the display light L from the display 120 toward the concave mirror 140.

As shown in FIG. 6, the concave mirror 140 has a substantially rectangular plate-shaped mirror surface that curves along its longitudinal direction. The concave mirror 140 reflects the display light L from the plane mirror 130 toward the windshield 200. The concave mirror 140 has a metal reflective film formed on one surface of a base material made of synthetic resin, glass, or the like. The plane mirror 130 and the concave mirror 140 form an optical system that guides the display light L from the display 120 to the windshield 200 constituting the projected member.

As shown in FIG. 7, the concave mirror 140 includes a main body portion 140a having the mirror surface and shafts 141a and 141b located at both side ends of the main body portion 140a. Each of the axes 141a and 141b has a rectangular cross section on the side close to the main body of the concave mirror 140, and has a circular cross section at the tip. The tip of the shaft 141a is rotatably fitted into the first bearing hole 190a shown in FIG. 3, and the tip of the shaft 141b is rotatably fitted into the second bearing hole 190b. The shaft 141a includes a large diameter portion 145a located at the center in the longitudinal direction thereof. The large diameter portion 145a fits into the large diameter portion receiver 191a of the first bearing hole 190a. As a result, the shaft 141a and thus the concave mirror 140 are fixed along the thrust direction of the bearing 118a. Further, the shaft 141a has a rectangular plate-shaped lever portion 142 extending toward the bottom surface 112b of the lower case 112. As shown in FIGS. 3 and 6, the shafts 141a and 141b are slidably and rotatably fixed to the bearing holes 190a and 190b by metal fittings 193a and 193b having a substantially Z-shaped cross section and screws (screws) 195a and 195b from above, respectively. To.

As shown in FIG. 7, the motor 143 is driven by the motor 143 to rotate the concave mirror 140 around its axes 141a and 141b via the advancing / retreating mechanism 144. The motor 143 is fixed to the bottom surface 112b on the front left side of the lower case 112. The motor 143 includes an output shaft 143a whose shaft rotates when the motor 143 is driven. The advancing / retreating mechanism 144 converts the axial rotation of the output shaft 143a of the motor 143 into a linear motion, and transmits the linear motion to the lever portion 142. As a result, the concave mirror 140 adjusts the tilt angle of the concave mirror 140 by the power of the motor 143. The motor 143 and the advancing / retreating mechanism 144 form a rotational force transmission unit that transmits a rotational force to the lever unit 142.

The control board 150 is a printed circuit board on which a control unit that controls the overall operation of the HUD device 100 is mounted. The control unit includes a CPU (Central Processing Unit), a memory, and the like, executes a control program stored in the memory, controls the display 120, and controls the tilt angle of the concave mirror 140 through the motor 143. Further, the control unit controls the display 120 so as to adjust the emission brightness of the display light L according to the illuminance data in front of the vehicle 300 acquired from the external light sensor 160. More specifically, the control unit increases the display gradation of the display image V as the illuminance indicated by the illuminance data from the external light sensor 160 increases, that is, as the illuminance in front of the vehicle 300 increases. To control the emission brightness of the display light L. As shown in FIG. 2, the control board 150 is provided between the top surface (front wall portion) 111f of the upper case 111 and the upper surface 122 of the display 120. As shown in FIG. 5, the external light sensor 160 is mounted on the control board 150. In this example, the external light sensor 160 is located on the light-shielding wall 115 side of the upper surface of the control board 150.

The external light sensor 160 is a photodetector such as a phototransistor. The external light sensor 160 detects the illuminance in front of the vehicle 300. The external light sensor 160 is electrically connected to the control board 150, and outputs the detected illuminance data to the control unit of the control board 150.

As shown in FIG. 5, the light guide body 170 is made of a translucent resin such as PMMA (PolyMethylMethAcrylate), and guides the light in front of the vehicle 300 to the external light sensor 160. The light guide body 170 is arranged above the external light sensor 160. The light guide body 170 has a shape in which a square columnar portion 170a and a triangular columnar portion 170b located at the tip of the square columnar portion 170a are connected to each other. The light guide body 170 includes a light receiving unit 171 that receives external light, a light reflecting unit 172 that receives light received by the light receiving unit 171 and reflects light that passes through the light guide body 170 toward a light emitting unit 173, and a light guide body. A light emitting unit 173 that emits light guided by 170 is provided. The light receiving portion 171 is located on the bottom surface of the square columnar portion 170a of the light guide body 170. The light receiving portion 171 is inserted into the through hole 111e of the light shielding wall 115 of the upper case 111 inside the cover 114. The light reflecting portion 172 is located on one inclined surface of the triangular columnar portion 170b. The light emitting portion 173 is located on the other inclined surface of the triangular columnar portion 170b. The light emitting unit 173 faces the external light sensor 160.

The plane mirror holding member 180 is made of, for example, a black synthetic resin, and is formed in a thin plate shape having a substantially L-shaped cross section in a side view as shown in FIG. 9A. The plane mirror holding member 180 extends from the blind portion 181 arranged between the control board 150 and the display 120 and the right end portion of the blind portion 181 toward the bottom surface 112b of the lower case 112 to hold the plane mirror 130. It is provided with a plane mirror holding portion 182. As shown in FIG. 8, a control board 150 is placed on the upper part of the blind portion 181. The blind portion 181 partitions the space where the control board 150 is located and the space through which the light emitted from the display 120 passes. As shown in FIGS. 5 and 8, the control board 150 is fixed to the blind portion 181 and the lower case 112 from above with screws 195d, 195e, and 195f. The blind portion 181 is fixed to the lower case 112 from above with screws 195d, 195e, 195f, 195g, 195h, 195i, 195j. The screw 195 is a fastening tool and has a head and a threaded portion. The screw 195 is a male screw having a groove along a vine winding in the same direction in the threaded portion. The screws 195a to 195k are arranged at positions where the head is exposed to the outside when the upper case 111 is removed, and extend in the same direction. The blind portion 181 can remove stray light on the back surface of the control board 150. The blind portion 181 is provided with a strip-shaped insertion hole 183 at its right end. As shown in FIGS. 5 and 9B, the plane mirror 130 is held at the upper and lower ends by the insertion hole 183 and the plane mirror fixing portion 112c provided on the bottom surface 112b of the lower case 112, and both ends are held by the plane mirror holding portion 182. And the back is held.

According to the HUD device 100, since the control board 150 is provided inside the housing 110, the HUD device can be miniaturized. Further, since the external light sensor 160 is mounted on the control board 150, the external light sensor holder and the board for the external light sensor are unnecessary. Therefore, wiring between the board for the external light sensor and the control board 150 is also unnecessary. This eliminates the work of attaching the wiring between the external light sensor board and the control board 150, so that the connection structure between the external light sensor and the control board can be easily assembled while reducing the number of parts. .. Further, since the place where the control board 150 is attached is a dead space in the conventional HUD device, the HUD device 100 can reduce the volume of the space where the conventional control board is installed.

Further, since the HUD device 100 includes the light guide body 170 that guides the external light to the external light sensor 160, the external light sensor 160 does not have to be exposed to the outside of the housing 110, and the external light sensor holder can be used. unnecessary. Further, by adjusting the length of the light guide body 170 or the like, the arrangement of the external light sensor 160 is not limited to the vicinity of the outer periphery of the housing 110. Therefore, the arrangement of the control board 150 on which the external light sensor 160 is mounted is not limited.

The HUD device 100 includes a light-shielding wall 115, and the light guide body 170 guides external light to the external light sensor 160 through a through hole 111e formed in the light-shielding wall 115. Therefore, it is possible to prevent the display light L from becoming difficult to see due to stray light caused by sunlight incident from the opening 113 or the through hole 111e. If the external light sensor 160 is located at the end of the upper surface of the control board 150 near the light-shielding wall 115, the possibility that the external light is incident on the display 120 can be further reduced.

Although the control board 150 is arranged above the display 120, since the blind portion 181 of the plane mirror holding member 180 is arranged below the control board 150, the HUD device 100 can remove stray light by the blind portion 181. .. Further, since the blind portion 181 and the plane mirror holding portion 182 are one member, the number of parts can be reduced and the assembly becomes easy.

The display surface 123 of the display 120 is arranged diagonally upward so as to form an acute angle A with respect to the blind portion 181. Therefore, when the stray light S that has entered the housing 110 from the opening 113 is irradiated to the display surface 123, the display surface 123 reflects the stray light S diagonally upward. Therefore, the stray light S can reach the lower surface of the blind portion 181 directly or through the plane mirror 130. Therefore, the possibility that the stray light S reflected by the display surface 123 will reach the viewer U is reduced, and the possibility that the view of the viewer U is obstructed by the stray light S is reduced. Further, conventionally, the display surface is arranged toward the bottom surface of the lower case, whereas in the present embodiment, the display surface 123 is arranged diagonally upward so as to form an acute angle A with respect to the blind portion 181. Therefore, when assembling the HUD device 100, the assembling worker installs the display 120 while visually observing the display surface 123 of the display 120 from above the lower case 112 through the window portion 192. Can be done. Therefore, the HUD device 100 of the present embodiment can improve the work efficiency and the work accuracy as compared with the HUD device in which the conventional display surface is arranged toward the bottom surface of the lower case.

Since the bearings 118a and 118b are formed at positions exposed to the outside when the upper case 111 is removed, the concave mirror 140 can be installed simply by arranging the shafts 141a and 141b of the concave mirror 140 on the bearings 118a and 118b from above. Can be done.

Further, since the shaft 141a is provided with the large diameter portion 145a and the first bearing hole 190a is provided with the large diameter portion receiver 191a into which the large diameter portion 145a is fitted, the concave mirror 140 is displaced in the thrust direction. The concave mirror 140 can be easily attached to the bearings 118a and 118b of the lower case 112.

Since the motor 143 and the advancing / retreating mechanism 144, which are the rotational force transmission portions, are provided on the bottom surface 112b of the lower case 112, and the lever portion 142 extends toward the bottom surface 112b, the mechanism for rotating the concave mirror 140 can be easily assembled. Become.

Next, a method of assembling the HUD device 100 will be described.

The display 120 and the heat radiation fin 117 are fixed to the accommodating portion 112a of the lower case 112. The motor 143 is fixed in the lower case 112, and the shafts 141a and 141b of the concave mirror 140 are fitted into the bearings 118a and 118b, respectively. Then, the metal fittings 193a and 193b are fixed to the bearings 118a and 118b.

Next, the plane mirror holding member 180 is fitted into the lower case 112 so that the blind portion 181 is located on the upper surface of the control board mounting portion 116. Then, the control board 150 is installed on the upper surface of the blind portion 181.

In this state, the screws 195a to 195k are screwed all at once. Finally, the upper case 111 is fitted into the lower case 112. This completes the assembly of the HUD device 100.

In this way, the motor 143, the concave mirror 140, the plane mirror holding member 180, and the control board 150 need only be fitted downward and fixed to the lower case 112 with screws 195 from above, which facilitates the assembly of the HUD device 100. ..

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various applications and modifications are possible.

In the present embodiment, the plane mirror holding member 180 is formed in a thin plate shape having a substantially L-shaped cross section in a side view, and the plane mirror 130 is held at the upper and lower ends by the insertion hole 183 and the plane mirror fixing portion 112c, and is held by the plane mirror holding portion 182. It was configured to hold both ends. However, the shape of the plane mirror holding member 180 does not matter as long as it can hold the plane mirror 130 and can remove stray light by the blind portion 181. If the blind portion 181 and the plane mirror holding portion 182 are one member, the number of parts can be reduced and the assembly becomes easy, but they may be separate members.

In the present embodiment, the control unit of the control board 150 adjusts the emission brightness of the display light L according to the illuminance data from the external light sensor 160, but the control board 150 does not mount the external light sensor 160. The viewer U may adjust the emission brightness of the display light L by himself / herself. Alternatively, the control unit may adjust the emission brightness of the display light L according to the illuminance data from the external light sensor 160, and the viewer U may adjust the emission brightness of the display light L by himself / herself.

In the present embodiment, the projected member is a windshield, but the projected member may be a combiner or the like.

In the present embodiment, the head-up display device is mounted on a vehicle, but the head-up display device is not limited to the vehicle-mounted device, and may be mounted on an arbitrary moving body such as an airplane or a ship.

Further, in the present embodiment, the concave mirror 140 has the lever portion 142, but the concave mirror 140 does not have the lever portion, and other parts capable of substituting the function of the lever portion may be separately arranged. ..

In the present embodiment, the blind portion 181 (plane mirror holding member 180) is formed of a black synthetic resin having a low reflectance, but the blind portion 181 has a reflectance such as an alloy of nickel and phosphorus. It may be formed of a low substance. Alternatively, only the lower surface of the blind portion 181 may be printed with a color having a low reflectance or may be formed of a substance having a low reflectance.

Further, in the present embodiment, the partition wall 119a is inclined upward (lower surface of the blind portion 181) at a predetermined angle, but the partition wall 119a is formed vertically and has an inverted triangular shape when viewed from the side. By arranging the display surface 123 with a member for adjusting the inclination of the display surface 123 in between, the display surface 123 may be inclined upward at a predetermined angle. Alternatively, the partition wall 119a may not be formed in the lower case 112, and a positioning member may be formed in the lower case 112 so that the display surface 123 can be tilted upward at a predetermined angle and arranged.

100 Head-up display device 110 Housing 111 Upper case 111e Through hole 112 Lower case 113 Opening 115 Shading wall 120 Display 123 Display surface 130 Flat mirror 140 Concave mirror 150 Control board 160 External light sensor 170 Light guide 171 Light receiving part 173 Light emission Part 180 Plane mirror holding member 181 Blind part 182 Plane mirror holding part 195a to 195k Screw (screw)
200 Windshield (projected member)
300 Vehicle L Display light S Stray light U Visualizer

Claims (3)

It ’s a head-up display device.
With the lower case
An upper case that is attached to the lower case and forms a housing together with the lower case,
The display fixed to the lower case and
An optical system housed in the lower case and guiding the light emitted by the display to the projected member, and
A control board on which an external light sensor is mounted and
A screw, which secures the control board to the lower case, is provided.
The control board is provided between the top surface of the upper case and the upper surface of the display .
The screw comprises a head that is exposed to the outside when the upper case is removed from the head-up display device.
A head-up display device characterized by that. A blind portion is provided in the housing, which partitions a space in which the control board is located and a space through which the light emitted from the display is passed.
The head-up display device according to claim 1. A light receiving unit that receives external light and a light guide body that includes a light emitting unit that emits the external light received from the light receiving unit are provided.
The upper case has a through hole formed therein.
In the light guide body, the light receiving portion is located in the through hole, and the light emitting portion is arranged so as to be located in the external light sensor.
The head-up display device according to claim 1 or 2, wherein the head-up display device is characterized in that.

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