WO2017163892A1

WO2017163892A1 - Head-up display device

Info

Publication number: WO2017163892A1
Application number: PCT/JP2017/009386
Authority: WO
Inventors: 聡土屋; 鈴木　淳
Original assignee: 日本精機株式会社
Priority date: 2016-03-23
Filing date: 2017-03-09
Publication date: 2017-09-28
Also published as: JP2020169024A; JP6777143B2; JP7008267B2; JPWO2017163892A1

Abstract

Provided is a head-up display device such that an outside light detection unit can be fixed therein with a hook while rattle is prevented. This head-up display device is equipped with: an outside light detection unit 40 which has a light sensor (outside light detection element) that detects the illuminance of outside light and an element holder 42 that holds the light sensor (outside light detection element); and a case 50 which has an interior space where the outside light detection unit 40 is accommodated and a through-hole through which outside light from the outside is guided into the outside light detection unit 40. The case 50 is equipped with: a hook member 60 which has a locking claw 61 that locks the outside light detection unit 40; an elastic biasing member 62 which biases the outside light detection unit 40 toward the hook member 60; and a detent member 63 which abuts the outside light detection unit 40 at a position where the outside light detection unit 40 is sandwiched between the elastic biasing member 62 and the detent member 63.

Description

Head-up display device

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

The head-up display device is a device that displays information necessary for driving to the driver in a virtual image by superimposing it on the scenery in front of the vehicle. Thus, the driver can grasp necessary information without performing a large line of sight movement during driving.
For example, in the head-up display device disclosed in Patent Document 1, in order to prevent the display from becoming difficult to see due to external light, an external light detection unit is provided in the case to detect the illuminance of external light and perform adjustment control. Has been done. The external light detection unit is fixed in the case with screws.

JP2015-71391A

Since the external light detection unit described in Patent Document 1 is fixed to the case with a screw, it is necessary to tighten it with a screw after installing the external light detection unit. is there.
Thus, it is conceivable to provide a hook in the case in advance and fix it with the hook. However, there is a problem that the hook may cause looseness.

The present invention has been made in view of the above-described present situation, and an object of the present invention is to provide a head-up display device that can prevent the occurrence of backlash and can fix the external light detection unit with a hook.

In order to achieve the above object, a head-up display device according to the present invention includes:
A head-up display device that allows a viewer to visually recognize a virtual image,
An external light detection unit having an external light detection element for detecting the illuminance of external light, and an element holder for holding the external light detection element,
A case in which the external light detection unit is housed in an internal space and a through hole is formed through which external light is guided from the outside to the external light detection unit;
The case is
A hook member having a locking claw portion for locking the external light detection unit;
An elastic biasing member that biases the external light detection unit toward the hook member;
A detent member that hits the external light detection unit at a position sandwiching the external light detection unit together with the elastic biasing member,
It is characterized by that.

According to the present invention, the external light detection unit can be hook-fixed by preventing the occurrence of backlash.

1 is a schematic view of a head-up display device according to an embodiment of the present invention. The schematic sectional drawing of the display apparatus by the embodiment. The block diagram of the control means by the embodiment. The perspective view of the external light detection unit by the embodiment. The perspective view and partial expanded sectional view which reversed the case by the embodiment. The schematic perspective view of the state which attached the external light detection unit to the inverted case by the embodiment. Sectional drawing of the principal part which shows the state which attached the external light detection unit to the inverted case by the same embodiment The fragmentary perspective view except the low reflection sheet of the case by the same embodiment. The fragmentary perspective view of the case by the embodiment. The schematic sectional drawing of the low reflection sheet by the same embodiment.

Hereinafter, an embodiment in which the present invention is applied to a head-up display device for a vehicle will be described with reference to the drawings.
In the following description, the front-rear direction viewed from the driver 14 is the X direction, the left-right direction viewed from the driver 14 is the Y direction, and the vertical direction viewed from the driver is the Z direction. Further, the direction in which the arrows indicating the X direction, the Y direction, and the Z direction are directed will be described as a + (plus) direction, and the opposite direction will be described as a-(minus) direction.

As shown in FIG. 1, the head-up display device includes a windshield 13 of a vehicle 10 that is a projection member that emits display light L that is projected by a display device 12 that is a display unit disposed inside the instrument panel 11 of the vehicle 10. Thus, the image is reflected in the direction (−X direction) of the driver (viewer) 14 of the vehicle 10 and the virtual image V is displayed to the driver 14. In other words, the head-up display device irradiates (projects) the front glass 13 (projection member) with display light L emitted from a light-emitting display device 20 (to be described later) of the display device 12, and a virtual image ( Display image) V is visually recognized by the driver 14. Thus, the driver 14 can observe the virtual image V displayed in front of the driver's seat in front of the driver seat (+ X direction) with the scenery superimposed.

In the head-up display device of the present invention, when the display of the virtual image V is visually recognized by the driver (viewer) 14, the illuminance of the display is adjusted so as to prevent the display from becoming difficult to see due to external light. For this reason, it is necessary to provide the external light detection unit 40 in the case 50 to detect the illuminance of the external light. However, the external light detection unit 40 can be easily and reliably replaced with a conventional screw by a hook method. The case 50 can be fixed.
The head-up display device of the present invention includes an external light detection unit having an optical sensor (external light detection element) 41 that detects the illuminance of external light, and an element holder 42 that holds the optical sensor (external light detection element) 41. 40 and a case 50 in which an external light detection unit 40 is accommodated in an internal space 53 and a through hole 57 through which external light is guided from the outside to the external light detection unit 40 is formed. The case 50 includes a hook member 60 having a locking claw portion 61 that locks the external light detection unit 40, an elastic biasing member 62 that biases the external light detection unit 40 toward the hook member 60, and elasticity. And an anti-rotation member 63 that contacts the external light detection unit 40 at a position where the external light detection unit 40 is sandwiched together with the urging member 62. As a result, the external light detection unit 40 can be securely fixed to the case 50 by the hook member 60, the elastic urging member 62, and the anti-rotation member 63 to prevent backlash.

In the head-up display device, as shown in FIG. 2, the display device 12 mainly includes a light emitting display 20 that emits display light L, a reflector 30, an external light detection unit 40, and a case 50. ing.

The light emitting display 20 is mainly composed of, for example, a liquid crystal display element 21, a lens 22, a light source 23, a wiring board 24, and a housing 25.

As the liquid crystal display element 21, for example, a TFT type liquid crystal panel having polarizing plates attached to both front and rear surfaces is used. The liquid crystal display element 21 displays, for example, the speed of the vehicle. The lens 22 is made of a light-transmitting synthetic resin such as acrylic and is disposed between the liquid crystal display element 21 and the light source 23. The light source 23 is composed of, for example, a chip type light emitting diode that emits light in appropriate colors. The light from the light source 23 illuminates the liquid crystal display element 21 through the lens 22. Thereby, when the light source 23 emits light, the liquid crystal display element 21 emits display light L for displaying, for example, the speed of the vehicle.
Further, the wiring board 24 is made of a hard circuit board on which a predetermined wiring pattern is formed, and is mounted with a control means 70, which will be described later, which is a microcomputer, and is conductively connected to the wiring pattern. The housing 25 accommodates the liquid crystal display element 21, the lens 22, the light source 23, and the wiring substrate 24, and is an abbreviation for allowing the display light L to pass at a position corresponding to the display surface of the liquid crystal display element 21. A rectangular opening (not shown) is formed.

The reflector 30 includes a concave mirror (reflecting member) 31 that reflects the display light L emitted from the liquid crystal display element 21 (light emitting display 20), and a mirror holder 32 that holds the concave mirror 31.
The concave mirror 31 is made of a resin base material made of polycarbonate having a concave surface, and is formed by vapor-depositing a reflective film on the concave surface. The concave mirror 31 is attached to the mirror holder 32 by a double-sided adhesive tape, and is disposed in an inclined state at a position where the reflective film on the surface faces the translucent cover 55 of the case 50 and faces the translucent cover 55. Is done. The mirror holder 32 is made of synthetic resin, for example, ABS resin, and is fixed to the case 50. Thereby, the concave mirror 31 enlarges the display light L from the liquid crystal display element 21 and projects the enlarged display light L onto the windshield 13 through the translucent cover 55.

The external light detection unit 40 includes an optical sensor 41 as an external light detection element, an element holder 42, and a circuit board 43 on which the optical sensor 41 is mounted (arranged). In the external light detection unit 40, as shown in FIG. 2, the optical sensor 41 is mounted on the circuit board 43 and accommodated in the element holder 42. The element holder 42 is attached to the case 50 with a hook member 60 as described later.
The optical sensor 41 uses, for example, a photodiode, detects the illuminance of outside light, and outputs illuminance data to the control means 70 described later.
Note that the optical axis of the optical sensor 41 faces the front side of the vehicle 10 (the translucent cover 55 side, + X direction), and detects the illuminance of external light from the front of the vehicle.
The circuit board 43 is formed of a hard circuit board on which a predetermined circuit pattern is formed, and the optical sensor 41 is conductively connected to the circuit pattern. The circuit board 43 is electrically connected to the wiring board 24 of the light emitting display 20 by a wiring member such as a harness (not shown).

The element holder 42 is made of, for example, a black synthetic resin material.
As shown in FIGS. 4, 6 and 7, the element holder 42 includes a main body 44. The main body 44 is composed of a horizontal portion (on the XY plane) 44a as a bottom portion and a horizontal portion 44a. A vertical portion 44b protruding upward (in the + Z direction) and serving as a back surface portion is integrally formed in an L shape. The vertical portion 44b of the main body 44 is integrally provided with a substantially cylindrical surrounding portion 45 whose front (+ X direction) is opened obliquely so as to surround the optical sensor 41 (not shown in FIG. 4, see FIG. 2). Is formed. The element holder 42 protrudes rearward (−X direction) below the vertical portion 44b, and lower end surface of the plate-like circuit board 43 (−Z direction, upper end surface when the case 50 of FIG. 7 is inverted (+ Z direction). )) Is attached to the groove-shaped holding portion 46 so as to open upward (+ Z direction). Furthermore, the element holder 42 includes a substrate hook 47 that locks two concave stepped portions 43 a formed on the upper end surface of the plate-like circuit board 43. The substrate hook 47 has a claw portion 47a at one end, is opposed to the holding portion 46, and the other end protrudes substantially horizontally (on the XY plane) from the main body portion 44 of the element holder 42. It is molded integrally with a synthetic resin material and has elasticity.
Therefore, after the lower end surface of the inclined circuit board 43 is mounted on the groove-shaped holding part 46, the circuit board 43 is raised so that the board hook 47 is positioned on the stepped part 43a so as to get over the claw part 47a. Push in to install.
As a result, the circuit board 43 having the lower end surface mounted on the groove-shaped holding portion 46 is moved in the vertical direction (Z direction) while the upper end surface is pressed by the arm portion of the substrate hook 47 placed in the stepped portion 43a. Is restricted, and movement in the left-right direction (Y direction) is restricted by the substrate hook 47 located on the stepped portion 43a. Further, movement of the circuit board 43 in the front-rear direction (X direction) is restricted by the back surface of the vertical part 44 b of the main body part 44 and the claw part 47 a of the board hook 47, and the circuit board 43 does not rattle the element holder 42. Can be fixed. In a state where the circuit board 43 is fixed to the element holder 42, the optical axis of the optical sensor 41 is fixed so as to be positioned on the central axis of the surrounding portion 45.
For example, as shown in FIGS. 4 and 7, rectangular projections 44 c having a rectangular cross section for fixing to the case 50 are provided on both ends of the horizontal portion 44 a of the main body 44 of the element holder 42 (left and right). (Projected in the Y direction).

The case 50 is formed in a box shape, for example, of a black synthetic resin material. As shown in FIG. 2, the upper case body 51 and the lower side having a substantially concave cross section divided vertically from the middle part (Z direction). The case body 52 is comprised. In the case 50, the light emitting display 20, the reflector 30, the external light detection unit 40, and the like are accommodated in a box-shaped internal space 53 formed by the upper case body 51 and the lower case body 52.

The upper case body 51 has an opening window portion 54 that is open on the upper surface (the windshield 13 side of the vehicle 10 (the surface in the + Z direction)), and the translucent cover 55 is disposed so as to close the opening window portion 54. It is arranged. The translucent cover 55 is made of a translucent synthetic resin material, for example, acrylic resin, and is formed in a downwardly convex curved shape. The display light L reflected by the concave mirror 31 of the reflector 30 is transmitted (passed through). It has a function as a light transmissive member. The light-transmitting cover 55 is provided with a shielding layer 55a, and is configured of, for example, a frame-like black print layer printed on the light-transmitting cover 55. The shielding layer 55a prevents external light from entering the case 50.
The display light L reflected by the concave mirror 31 by the translucent cover 55 is projected onto the windshield 13 through the translucent cover 55, and the virtual image V is displayed to the driver 14.

The case 50 includes a light shielding unit 56 for preventing external light such as sunlight from entering the light emitting display 20 through a translucent cover 55 provided on the upper surface of the case 50. The light shielding portion 56 constitutes a light shielding wall for preventing a phenomenon (washout) in which external light is incident on the light emitting display 20 and the virtual image V becomes difficult to be seen. Are integrally formed so as to hang down. In the light shielding part 56, external light is transmitted to the optical sensor 41 through the opening of the surrounding part 45 in accordance with the optical axis (X direction) of the optical sensor 41 mounted on the circuit board 43 attached to the element holder 42. A penetrating through hole 57 for guiding is formed.

The case 50 includes a hook member 60 and the like for fixing the element holder 42 to the upper case body 51 of the case 50 (see, for example, FIG. 5). That is, the case 50 includes a hook member 60 having a locking claw portion 61 that locks the external light detection unit 40, an elastic biasing member 62 that biases the external light detection unit 40 toward the hook member 60, and elasticity. And an anti-rotation member 63 that contacts the external light detection unit 40 at a position where the external light detection unit 40 is sandwiched together with the urging member 62 (see FIGS. 5 to 7).
As shown in FIG. 5, the hook member 60 is integrally formed so as to protrude downward (−Z direction) from the upper surface portion 51a of the upper case body 51, and the fixed base portion 60a and the elastic hook 60b are opposed to each other. In accordance with the size of the element holder 42, two sets are provided with a space left and right (Y direction). An L-shaped step portion 64 is formed on the fixing base 60a so that the upper surface (surface in the + Z direction) and the front surface (surface in the + X direction) of the fixing protrusion 44c having a rectangular cross section can be applied. is there. The locking claw 61 formed at the tip of the hook member 60 is formed at the tip of the elastic hook 60b, and faces the step 64 of the fixing base 60a, and the lower surface (− It is formed so as to be able to hold the surface in the Z direction) and the rear surface (the surface in the −X direction), and is formed integrally with the case 50 and has elasticity. The locking claw portion 61 includes an inclined surface whose thickness increases from the lower end toward the upper end on the stepped portion 64 side of the fixed base 60a, and serves as a guide portion when the element holder 42 is mounted.

The hook member 60 is integrally formed with the case 50 and a synthetic resin, and a release hole 58 through which the mold passes when the locking claw 61 is formed with a mold is formed through the case 50 (FIG. 5). FIG. 7 and FIG. 8). The release holes 58 are formed between the fixed base 60a and the elastic hooks 60b, and two release holes 58 are formed corresponding to the two sets of hook members 60. The two release holes 58 are formed on the outer side (the outer wall surface side of the case 50 (the wall surface side in the + X direction in FIG. 8)) than the through hole 57 for detecting external light of the light shielding portion 56. By doing so, the release hole 58 becomes difficult to see from the outside of the case 50, and the appearance can be improved.
On the other hand, since the release hole 58 penetrates the light shielding part 56 and external light enters, the low reflection sheet 65 is attached to the outer surface of the light shielding part 56 as shown in FIG. The mold hole 58 is blocked and reflection of external light is suppressed.
Instead of closing the release hole 58 with the low reflection sheet 65, the release hole 58 is covered with a shielding layer 55 a formed on the translucent cover 55 so that the release hole 58 cannot be seen by the driver 14. It may be concealed (see FIG. 2).
As shown in FIG. 10, the low-reflection sheet 65 has, for example, a foamed urethane 65b colored in black applied to the surface of a polyester sheet base 65a, and an adhesive such as a double-sided tape attached to the back surface of the sheet base 65a. A layer 65c is provided.
By closing the penetrating release hole 58 from the surface side of the light shielding portion 56 of the upper case body 51 with the low reflection sheet 65, reflection of external light and incidence of external light can be prevented. It can be prevented from becoming difficult to see.
Note that the release hole 58 may be closed by another material, and is not limited to the low reflection sheet 65.
Further, in order to suppress reflection, the release hole 58 may be closed with a sheet or the like and painted with a black paint, or may be closed with a textured sheet.

Further, when a cord clamp for holding the cord to be wired is integrally formed inside the case 50 of the light shielding portion 56, the shape is similar to that of the hook member 60, and a release hole is formed in the light shielding portion 56. There is a case. Also in this case, it is possible to suppress the incidence of external light and reflection of external light by closing the release hole with the low reflection sheet 65.

The case 50 includes an elastic urging member 62. The elastic biasing member 62 biases the back surface of the circuit board 43 away from the position where the element holder 42 is fixed by the hook member 60 toward the hook member 60. The elastic urging members 62 are formed at two positions at intervals in the left and right (Y direction) so as to protrude downward from the upper surface portion 51a of the case 50 (-Z direction) and hang down.
Between the two elastic urging members 62, as shown in FIG. 5A and FIG. 7, a detent member 63 that contacts the external light detection unit 40 from the front side protrudes downward from the upper surface portion 51a of the case 50. One detent member 63 is integrally formed so as to hang down.
The anti-rotation member 63 collides with the two elastic biasing members 62 in contact with the vertical portion 44b of the element holder 42 of the external light detection unit 40 (the portion connecting the two substrate hooks 47). 42 is sandwiched and pressed.
Accordingly, the element holder 42 functions as a detent that suppresses the movement of the element holder 42 about the direction (Y direction) connecting the portions attached by the two hook members 60 as the central axis (Y direction axis). .

The element holder 42 is fixed to the upper case body 51 so that the central axis (X direction) of the surrounding portion 45 of the element holder 42 coincides with the center of the through hole 57 of the light shielding portion 56 of the upper case body 51. Align. Thereafter, the fixing protrusions 44c at both ends of the horizontal portion 44a of the element holder 42 are pushed between the hook members 60, and the back surface of the circuit board 43 comes into contact with the front surface of the elastic biasing member 62, so It pushes in so that the front surface of the part 44b may contact the back surface of the rotation prevention member 63. FIG.
By doing so, the fixing projection 44c is sandwiched between the step 64 of the fixing base 60a of the hook member 60 and the locking claw 61 of the elastic hook 60b in the vertical direction (Z direction) and the horizontal direction (Y direction). Fixed. In addition, the elastic biasing member 62 presses the element holder 42 against the step 64 side of the front (+ X direction) fixing base 60a, thereby fixing the element holder 42 without rattling in the front-rear direction (X direction). Further, the element holder 42 of the external light detection unit 40 is sandwiched between the two elastic urging members 62 and the anti-rotation member 63 facing each other, and the hook member 60 to which the element holder 42 is attached is set as the rotation center (Y-direction axis). Rotation that leaves the case 50 is suppressed.
Therefore, the external light detection unit 40 can be fixed to the case 50 via the element holder 42 with the hook member 60, and the occurrence of backlash can be prevented and fixed at a predetermined position.
As a result, the optical sensor 41 passes through the translucent cover 55 and passes through the through portion 57 provided in the light shielding portion 56 and the surrounding portion 45 provided so as to communicate with the through portion 57. External light can be detected by the optical sensor 41, and highly accurate illuminance data can be output to the control means 70.

As shown in FIG. 3, the control means 70 includes a CPU 71, a RAM 72, a ROM 73, etc., which are microcomputers. The control means 70 is mounted on the wiring board 24, drives the liquid crystal display element 21 via the liquid crystal drive circuit 74, and drives the light source 23 via the light source drive circuit 75. The control means 70 performs predetermined arithmetic processing according to a program stored in the ROM 73 based on the illuminance data detected and output by the optical sensor 41, and adjusts the illuminance of the light source 23 (light emitting display 20). It is configured as follows.
Further, for example, a vehicle speed sensor 76 is connected to the control means 70, and based on the speed data from the vehicle speed sensor 76, the display light L is emitted and emitted so that the driver can visually recognize the virtual image V.

As described above in detail with the embodiment, according to the head-up display device of the present invention, the illuminance of external light is a head-up display device that allows the driver (viewer) 14 to visually recognize the display by the virtual image V. An external light detection unit 40 having an optical sensor (external light detection element) 41 for detecting the light and an element holder 42 for holding the optical sensor (external light detection element) 41, and the external light detection unit 40 in the internal space 53. And a case 50 formed with a through hole 57 through which external light is guided from the outside to the external light detection unit 40. The case 50 has a locking claw portion 61 for locking the external light detection unit 40. A hook member 60, an elastic urging member 62 that urges the external light detection unit 40 toward the hook member 60, and an external position at which the external light detection unit 40 is sandwiched together with the elastic urging member 62. And an anti-rotation member 63 that hits the detection unit 40, so that the external light detection unit 40 can be attached by the locking claw portion 61 of the hook member 60 provided in the case 50 and biased by the elastic biasing member 62. By doing so, the backlash can be eliminated. Further, by being sandwiched between the elastic biasing member 62 and the rotation preventing member 63, the rotation around the hook member 60 can be suppressed and fixed more reliably, and the rotation of the external light detection unit 40 in the rotation direction can be prevented. Can also be suppressed.
Thereby, compared with the case where it fixes with a screw etc., the restrictions of the direction of assembly work are eased, it can assemble easily from the lower side of case 50, and it can reduce an assembly man-hour.

Further, according to the head-up display device of the present invention, the case 50 is released from the mold when the locking claw 61 of the hook member 60 formed integrally with the case 50 is formed by the mold. Since the hole 58 is formed so as to penetrate therethrough and the release hole 58 is closed by the low reflection sheet 65 attached to the case 50, the hook member 60 including the locking claw portion 61 is formed integrally with the case 50. Even if the mold release hole 58 is generated, the appearance of the appearance can be prevented from being deteriorated by closing with the low reflection sheet 65, and external light can be prevented from entering the case 50 and becoming stray light.
As a result, the hook member 60 can be easily molded into the case 50, and the release hole 58 can be easily processed by simply attaching the low reflection sheet 65.

Therefore, according to such a head-up display device, when the circuit board 43 on which the optical sensor 41 is mounted is attached to the upper case body 51 via the element holder 42, the engagement formed integrally with the upper case body 51 is provided. By attaching using the hook member 60 having the pawl portion 61, the elastic biasing member 62, and the anti-rotation member 63, the optical axis of the external light detection unit 40 is prevented from being displaced. Accurate external light detection by the optical sensor 41 becomes possible.

In the present embodiment, the example in which the display light L emitted from the light emitting display 20 is projected onto the windshield 13 has been described. For example, the display light L is favorably reflected in the direction of the driver 14 on the windshield 13. A combiner film may be provided, or the display light L may be projected onto a dedicated reflector different from the windshield 13.

The present invention is suitable for a head-up display device mounted on a vehicle.

10 Vehicle 11 Instrument Panel 12 Display Device (Display Unit)
13 Windshield (projection member)
14 Driver (observer)
DESCRIPTION OF SYMBOLS 20 Light emitting display 21 Liquid crystal display element 22 Lens 23 Light source 24 Wiring board 25 Housing 30 Reflector 31 Concave mirror (reflective member)
32 Mirror holder 40 External light detection unit 41 Optical sensor (external light detection element)
42 element holder 43 circuit board 43a stepped portion 44 main body portion 44a horizontal portion 44b vertical portion 44c fixing projection 45 surrounding portion 46 holding portion 47 substrate hook 47a claw portion 50 case 51 upper case body 51a upper surface portion 52 lower case body 53 Internal space 54 Open window 55 Translucent cover (translucent part)
55a Shielding layer 56 Light shielding part 57 Through hole 58 Release hole 60 Hook member 60a Fixing base part 60b Elastic hook 61 Locking claw part 62 Elastic urging member 63 Non-rotating member 64 Step part 65 Low reflection sheet

65a Sheet ground

65b Foaming Urethane

65c Adhesive layer 70 Control means 71 CPU
72 RAM
73 ROM
74 Liquid crystal drive circuit 75 Light source drive circuit 76 Vehicle speed sensor L Display light V Virtual image X Back and forth direction Y Left and right direction Z Up and down direction

Claims

A head-up display device that allows a viewer to visually recognize a virtual image,
An external light detection unit having an external light detection element for detecting the illuminance of external light, and an element holder for holding the external light detection element,
A case in which the external light detection unit is housed in an internal space and a through hole is formed through which external light is guided from the outside to the external light detection unit;
The case is
A hook member having a locking claw portion for locking the external light detection unit;
An elastic biasing member that biases the external light detection unit toward the hook member;
A detent member that hits the external light detection unit at a position sandwiching the external light detection unit together with the elastic biasing member,
A head-up display device.
The case is formed with a release hole through which the mold passes when the locking claw portion of the hook member formed integrally with the case is formed with a mold,
The release hole is closed by a low reflection sheet attached to the case,
The head-up display device according to claim 1.