Head-up display device

Abstract

The utility model provides a head-up display device which can more reliably fix a cylindrical part through a screw. A head-up display device is provided with: a light source that emits illumination light (IL); a display unit that receives the illumination light (IL) and emits display light; and a lens holder (20) through which the illumination light (IL) passes. The lens holder (20) is provided with a screw fixing part (25A) which is provided with a screw passing hole (25h) through which the shaft part of the screw (80) passes, and is fixed to the screw hole part (60i) through the screw (80). The screw fixing section (25A) is provided with: a U-shaped groove section (26) that forms a half-circumferential section (HC1) of the entire circumference of the screw passage hole (25h); and a U-shaped groove section (27) that forms a half-circumferential section (HC2) that is different from the half-circumferential section (HC1) in the entire circumference of the screw passage hole (25h). The U-shaped grooves (26) and (27) are provided at staggered positions so as not to overlap in the light traveling direction of the illumination light (IL).

Description

Technical Field

[0001] The utility model relates to a head-up display device. Background Art

[0002] The head-up display device described in Patent Document 1 includes a light source substrate on which a light source is mounted, a lens for focusing light from the light source, and a housing that covers the light source substrate and the lens from all sides.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2021 / 235284 Utility Model Content

[0006] Issues to be Solved by Utility Models

[0007] In the structure of the above-mentioned Patent Document 1, generally speaking, the housing is formed by injection molding, and the demolding direction of the mold is set to the traveling direction of the light from the light source. Therefore, in the case where the hole for the screw to pass through is formed in a direction other than the demolding direction of the mold, it is necessary to form a U-shaped hole that opens in the demolding direction of the mold. In this case, the U-shaped hole may be deformed by the tightening force of the screw, such as the U-shaped hole expanding, and it is difficult to reliably screw the housing.

[0008] The utility model is completed in view of the above actual situation, and its purpose is to provide a head-up display device capable of more reliably fixing a cylindrical component with screws.

[0009] Means for solving problems

[0010] In order to achieve the above-mentioned object, the head-up display device of the present utility model comprises:

[0011] a light source that emits illuminating light;

[0012] A display unit that receives the illumination light and emits display light; and

[0013] a cylindrical member through which the illumination light or the display light passes,

[0014] The cylindrical member includes a screw fixing portion having a screw passing hole through which the shaft of the screw passes, and is fixed to the fixed portion by the screw.

[0015] The screw fixing portion comprises:

[0016] a first groove portion forming a first portion of the entire circumference of the screw through hole; and

[0017] a second groove portion that forms a second portion different from the first portion in the entire circumference of the screw through hole,

[0018] The first groove portion and the second groove portion are provided at offset positions so as not to overlap with each other in the light traveling direction of the illumination light or the display light.

[0019] Effect of utility model

[0020] According to the utility model, the cylindrical member can be fixed with screws more reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of a head-up display device according to an embodiment of the present invention.

[0023] Figure 3 It is a partial perspective view of a head-up display device according to an embodiment of the present invention.

[0024] Figure 4 This is a partial perspective view of the head-up display device in a state where a display unit cover is removed according to an embodiment of the present invention.

[0025] Figure 5 It is a perspective view of a lens holding frame according to one embodiment of the present invention.

[0026] Figure 6 It is a perspective view of a lens holding frame according to one embodiment of the present invention.

[0027] Figure 7 yes Figure 4 Cross-sectional view along line VII-VII.

[0028] Figure 8 Yes Figure 7 A magnified portion of the image.

[0029] Fig. 9 yes Figure 4 Cross-sectional view along line IX-IX.

[0030] Fig.10 (A) is a schematic cross-sectional view of a screw and a screw fixing portion of an embodiment of the present invention, (B) is a schematic cross-sectional view of a screw and a screw fixing portion of a comparative example, and (C) is a schematic top view of a screw and a screw fixing portion of a comparative example.

[0031] Fig.11 It is a schematic cross-sectional view of a screw fixing portion according to a modified example of the present invention.

[0032] Explanation of symbols

[0033] 1: Observer; 10: Display unit; 11: Display panel cover; 12: Display panel holder; 14: Display panel; 15: Display unit housing; 17: Optical element; 19: Heat mirror; 20: Lens holder; 21: Main body tube; 22: Substrate holding hook; 25A to 25D, 125, 225A: Screw fixing portion; 25h: Screw through hole; 26, 27, 26b, 27b, 28b, 126: U-shaped groove; 26a, 126a: Screw contact portion; 27a, 127a: Fixed object contact portion; 30: Concave mirror; 40: Illumination unit; 41: Light source substrate; 41a: Light source; 42 a, 42b, 42c: lens; 50: window; 60: housing; 60a: upper shell; 60b: lower shell; 60d: display cover; 60e: substrate cover; 60f: storage space; 60g: heat sink; 60h: through hole; 60i: screw hole; 60s: optical path space; 61: opening; 62: shielding cover; 70: control substrate; 80: screw; 100: head-up display device; 200: vehicle; 201: front windshield; F1: component force; J: central axis; L: display light; HC1, HC2: semicircular portion; V: virtual image; IL: illumination light; Cd: opposite direction; D: distance. DETAILED DESCRIPTION

[0034] An embodiment of the head-up display device of the present invention will be described with reference to the accompanying drawings.

[0035] like Figure 1 As shown, the head-up display device 100 is installed in the instrument panel of the vehicle 200. The head-up display device 100 emits display light L representing an image toward the front windshield 201, which is an example of a projection target member of the vehicle 200. The display light L is reflected by the front windshield 201 and reaches the observer 1 (mainly the driver of the vehicle 200). As a result, the virtual image V is displayed in a manner that can be visually recognized by the observer 1.

[0036] like Figure 2 As shown, the head-up display device 100 includes an illumination unit 40, a display unit 10, a concave mirror 30, a housing 60, and a control board 70. In the following description, the vehicle width direction is defined as the X direction, the vehicle height direction is defined as the Y direction, and the vehicle front-rear direction is defined as the Z direction.

[0037] The illumination unit 40 is a light box that irradiates illumination light IL toward the display unit 10. In this example, the illumination light IL travels along the Z-axis direction.

[0038] The specific structure of the lighting unit 40 will be described later.

[0039] The display unit 10 receives illumination light IL from the illumination unit 40 and emits display light L representing an image. The display unit 10 includes a display panel 14, an optical element 17, a heat mirror 19, and a display unit casing 15 that accommodates the display panel 14 and the optical element 17. The display unit casing 15 includes a display panel holder 12 and a display panel cover 11.

[0040] The display panel 14 is a TFT (Thin Film Transistor) type liquid crystal display panel controlled by the control substrate 70. The display panel 14 receives the illumination light IL from the illumination unit 40 and emits the display light L.

[0041] The optical element 17 is composed of a prism, a diffusion plate, and the like that adjusts the display light L from the display panel 14 .

[0042] The display panel holder 12 has a substantially rectangular tube shape that surrounds the display panel 14 and the optical element 17 from the outer periphery. The display panel 14 and the optical element 17 are accommodated in the display panel holder 12.

[0043] The display panel cover 11 is formed so as to be attachable to the display panel holder 12 so as to cover the display panel holder 12 from the lighting unit 40 side. The display panel cover 11 has a frame tube shape through which the illumination light IL passes.

[0044] The concave mirror 30 magnifies and reflects the display light L from the display unit 10 toward the front windshield 201 .

[0045] The housing 60 is formed of a non-light-transmissive resin or metal and is a hollow substantially rectangular parallelepiped. Various structures of the head-up display device 100 are accommodated in the housing 60. Specifically, the housing 60 includes an upper housing 60a, a lower housing 60b, a shielding cover 62, a display unit cover 60d, a substrate cover 60e, and a heat sink 60g.

[0046] The lower housing 60b is in the shape of a box that opens upward. An optical path space 60s for accommodating the concave mirror 30 and an accommodating space 60f for accommodating the display unit 10 and the lighting unit 40 are formed in the lower housing 60b. A through hole 60h for the display light L from the display unit 10 to pass through is formed on the side wall of the lower housing 60b located between the optical path space 60s and the accommodating space 60f.

[0047] The heat sink 60g is formed integrally with the lower case 60b, is located on the back side of a light source substrate 41 to be described later, and has a fin structure for releasing heat from the light source substrate 41 to the outside.

[0048] In addition, the heat sink 60g may be formed as a cover separately from the lower case 60b.

[0049] A plurality of screw holes 60i are provided in the storage space 60f of the lower case 60b (see Figure 7 The screw hole portion 60i is cylindrical and extends in the Y direction. Figure 7 A screw hole is formed on the upper end surface (in the middle). The shaft of the screw 80 can be screwed into the screw hole of the screw hole portion 60i.

[0050] The upper housing 60a functions as a cover that closes the optical path space 60s of the lower housing 60b from the upper side. An opening 61 is formed on the upper housing 60a at a position opposite to the front windshield 201. The upper housing 60a includes a curved plate-shaped window 50 that closes the opening 61. The window 50 is made of a light-transmitting resin such as acrylic that allows the display light L to pass through.

[0051] The shielding cover 62 is provided between the through hole 60h of the lower case 60b and the display unit 10, and is in the shape of a tube that guides the display light L emitted from the display unit 10 to the through hole 60h. The shielding cover 62 is attached to the light emission side of the display panel holder 12. The heat mirror 19 is provided between the shielding cover 62 and the display panel holder 12.

[0052] like Figure 3 and Figure 4 As shown, the display unit cover 60d is attached to the lower case 60b so as to cover the storage space 60f of the lower case 60b.

[0053] The board cover 60e is attached to the outer bottom surface of the lower case 60b so as to cover the control board 70 provided on the outer bottom surface of the lower case 60b.

[0054] The control board 70 is composed of a printed circuit board on which various electronic components such as a CPU (Central Processing Unit) are mounted, and controls the display unit 10 and the lighting unit 40 .

[0055] like Figure 2 As shown, the lighting unit 40 includes a plurality of light sources 41a, a light source substrate 41 on which the plurality of light sources 41a are mounted, a plurality of lenses 42a, 42b, 42c for adjusting illumination light from the light sources 41a, and a lens holder 20 for housing the plurality of lenses 42a, 42b, 42c.

[0056] The light source substrate 41 and the lenses 42 a , 42 b , and 42 c are arranged to face each other in a line in the Z direction.

[0057] The light source substrate 41 is disposed at a position directly contacting the heat sink 60g or indirectly contacting the heat sink 60g via a heat conductive sheet (not shown) so as to be able to dissipate heat to the heat sink 60g. A plurality of light sources 41a are mounted on the mounting surface of the light source substrate 41 that is opposite to the lens 42a. The light source 41a is an LED (Light Emitting Diode) that emits illumination light IL. Fig. 9 As shown, the light source substrate 41 is disposed in an orientation inclined with respect to the direction of the central axis J of the screw 80 .

[0058] like Figure 2 As shown, the lens 42a is a condenser lens, which substantially collimates the illumination light IL. The lenses 42b and 42c are biconvex lenses, which diffuse the illumination light IL in the X direction and the Y direction to distribute the display light L toward the eye box.

[0059] The lens holder 20 is a cylindrical member made of resin that surrounds the periphery of the light source substrate 41 and the lenses 42a, 42b, and 42c. The lens holder 20 is formed by injection molding using a pair of molds.

[0060] like Figures 5 to 7 As shown, the lens holder 20 includes a main body tube portion 21 , screw fixing portions 25A to 25D, a plurality of substrate holding hooks 22 , and a plurality of pressing portions 23 .

[0061] The main body cylinder 21 has a rectangular cylinder shape surrounding the outer periphery of the light source substrate 41 and the lenses 42 a , 42 b , and 42 c .

[0062] The plurality of board holding hooks 22 pass around the light source board 41 and are hooked on the back surface of the mounting surface of the light source board 41 .

[0063] The plurality of pressing parts 23 press the lens 42a toward the light source substrate 41. Thus, the light source substrate 41 is pressed toward the heat sink 60g. The plurality of pressing parts 23 are located on both sides of the lens 42a in the X direction and are leaf springs that urge the lens 42a toward the lens 42a.

[0064] The screw fixing portions 25A to 25D are substantially flat plate-shaped portions that are screwed to the screw hole portions 60i in the storage space 60f. The screw fixing portions 25A to 25D are located outside the main body tube portion 21. The screw fixing portions 25A, 25B, 25C, and 25D are arranged so as to sandwich the main body tube portion 21 from the X direction.

[0065] The screw fixing portions 25A and 25C are provided at positions different from those of the screw fixing portions 25B and 25D in the Y direction, and in this example, are located below the screw fixing portions 25B and 25D.

[0066] Next, the specific structure of the screw fixing portion 25A will be described. In addition, since the screw fixing portions 25B to 25D have the same structure as the screw fixing portion 25A, their description will be omitted.

[0067] like Figure 8 As shown, the screw fixing portion 25A includes a screw contact portion 26a forming a U-shaped groove portion 26, a fixing object contact portion 27a forming a U-shaped groove portion 27, and a screw through hole 25h. The screw contact portion 26a and the fixing object contact portion 27a are each in the shape of a plate having a thickness, and are arranged staggered in the direction of the central axis J of the screw 80. The screw contact portion 26a is located on the outside of the screw fixing portion 25A (the side away from the screw hole portion 60i), and the fixing object contact portion 27a is located on the inside of the screw fixing portion 25A (the side close to the screw hole portion 60i).

[0068] like Figure 5 As shown in the enlarged lower part of the U-shaped groove 26, the U-shaped groove 26 is in a U-shape that opens toward the light traveling direction of the illumination light IL. A screw through hole 25h is formed in the U-shaped groove 26. The semicircular portion HC1 of the screw through hole 25h is formed by the arc portion of the U-shaped groove 26. The head of the screw 80 contacts the outer circumference of the arc portion of the U-shaped groove 26 in the outer side surface of the screw contact portion 26a.

[0069] like Figure 6 As shown in the enlarged lower part of the figure, the U-shaped groove portion 27 is in a U-shape that opens in the opposite direction Cd that is opposite to the light traveling direction of the illumination light IL. A screw through hole 25h is formed in the U-shaped groove portion 27. The semicircular portion HC2 of the screw through hole 25h is formed by the arc portion of the U-shaped groove portion 27. The entire circumference of the screw through hole 25h is constituted by the semicircular portions HC1 and HC2, but the semicircular portions HC1 and HC2 are located at positions offset in the direction of the central axis J of the screw 80. The end face of the screw hole portion 60i contacts the outer circumference of the arc portion of the U-shaped groove portion 27 in the inner side surface of the fixed object contact portion 27a.

[0070] The U-shaped groove portions 26 and 27 are arranged to open in opposite directions to each other and partially overlap in the region of the screw through hole 25 h when viewed from the direction of the central axis J of the screw 80 .

[0071] like Figure 8 As shown, the central axis J of the screw hole 25h, the shaft of the screw 80, and the screw hole is set to be less than 90° (for example, 60° to 80°) relative to the light traveling direction of the illumination light IL. Fig. 9As shown, a component force F1 is generated as a force that presses the light source substrate 41 toward the heat sink 60g via the plurality of pressing portions 23 in the tightening force P that acts in the direction of the central axis J of the screw 80. The component force F1 is a force that acts in a direction orthogonal to the mounting surface of the light source substrate 41. Therefore, heat dissipation from the light source substrate 41 to the heat sink 60g can be reliably performed. Assuming that the central axis J is greater than 90°, the component force F1 is zero or negative, and therefore no force that presses the light source substrate 41 toward the heat sink 60g is generated.

[0072] The screw contact portion 26a (U-shaped groove portion 26) and the fixed object contact portion 27a (U-shaped groove portion 27) are staggered in a direction orthogonal to the illumination light IL so as not to overlap in the light traveling direction of the illumination light IL. In this example, the surface of the screw contact portion 26a on the screw hole portion 60i side and the surface of the fixed object contact portion 27a on the head side of the screw 80 are spaced apart by a distance D in the orthogonal direction. In addition, the two surfaces may not be spaced apart by the distance D.

[0073] The light traveling direction of the illumination light IL is the direction in which the cylindrical lens holder 20 extends, and is the demolding direction of a pair of molds when the lens holder 20 is injection molded. Thus, by making the screw contact portion 26a and the fixed object contact portion 27a not overlap in the demolding direction of the mold, the screw fixing portion 25A can be formed without using a sliding mold or the like.

[0074] Next, Fig.10 The effect of the structure of this embodiment shown in (A) is the same as Fig.10 The effects of the structures of the comparative examples shown in (B) and (C) are compared and described.

[0075] like Fig.10 As shown in (B) and (C) in the figure, in the comparative example, the screw fixing portion 125 has a U-shaped groove portion 126 that opens toward the light traveling direction of the illumination light IL. The screw contact portion 126a and the fixed object contact portion 127a are formed on the front and back sides of the screw fixing portion 125, respectively. In order to screw the screw fixing portion 125 to the screw hole portion 60i, the shaft portion of the screw 80 is passed through the U-shaped groove portion 126 and screwed into the screw hole of the screw hole portion 60i. As a result, the head of the screw 80 slides and rotates on the screw contact portion 126a. At this time, as shown in FIG. Fig.10 As shown by the arrow in (C), the U-shaped groove portion 126 is deformed in an expanded manner. Therefore, it is difficult to firmly screw the screw fixing portion 125 to the screw hole portion 60i. In addition, the screw contact portion 126a and the fixed object contact portion 127a are located at opposite positions, so the screw 80 is tilted, making it difficult to perform stable screw fixing.

[0076] In this regard, in this embodiment, if Fig.10As shown in (A) in the figure, the screw contact portion 26a and the fixed object contact portion 27a are respectively formed as different plate-like portions, which are offset in the direction of the central axis J. In the present embodiment, when the screw fixing portion 25A is screwed to the screw hole portion 60i, even if the head of the screw 80 slides and rotates on the screw contact portion 26a, the expansion of the U-shaped groove portion 26 can be suppressed by the fixed object contact portion 27a. Therefore, the screw fixing portion 25A can be firmly screwed to the screw hole portion 60i. In addition, the portion of the screw 80 pressing the screw fixing portion 25A and the portion of the screw fixing portion 25A pressing the screw hole portion 60i are arranged at different positions around the central axis J. Therefore, the screw 80 is not easy to tilt, and stable screw fixing can be performed.

[0077] (Effect)

[0078] According to the above-described embodiment, the following effects are achieved.

[0079] (1) The head-up display device 100 includes: a light source 41a that emits illumination light IL; a display unit 10 that receives the illumination light IL and emits display light L; and a lens holder 20 as an example of a tubular member through which the illumination light IL passes. The lens holder 20 includes a screw fixing portion 25A having a screw through hole 25h through which the shaft of a screw 80 passes, and fixed to a screw hole portion 60i as an example of a fixed portion by the screw 80. The screw fixing portion 25A includes: a U-shaped groove portion 26 as an example of a first groove portion that forms a first portion (semicircle portion HC1) of the entire circumference of the screw through hole 25h; and a U-shaped groove portion 27 as an example of a second groove portion that forms a second portion (semicircle portion HC2) of the entire circumference of the screw through hole 25h that is different from the first portion. The U-shaped groove portions 26 and 27 are provided at offset positions so as not to overlap in the light traveling direction of the illumination light IL.

[0080] According to this structure, the screw hole 25h is composed of the U-shaped grooves 26 and 27 provided at positions that do not overlap in the light traveling direction of the illumination light IL. Therefore, the entire area of ​​the screw hole 25h in the direction of the central axis J does not open in the light traveling direction of the illumination light IL (the demolding direction of the mold). Therefore, the shape of the screw hole 25h does not change due to the tightening force of the screw 80, and the lens holder 20 can be screwed more reliably.

[0081] (2) The U-shaped groove portion 26 is in a U-shape that opens toward the light traveling direction of the illumination light IL. The U-shaped groove portion 27 is in a U-shape that opens toward the opposite direction Cd that is opposite to the light traveling direction. When viewed from the direction of the central axis J of the screw 80, the screw through hole 25h is formed at a position where the U-shaped groove portions 26 and 27 overlap.

[0082] According to this structure, the shape of the screw passage hole 25h does not change due to the tightening force of the screw 80, and the lens holding frame 20 can be screwed more reliably.

[0083] (3) The lens holder 20 includes the plurality of screw fixing portions 25A to 25D, which are arranged at shifted positions so as not to overlap each other in the light traveling direction of the illumination light IL.

[0084] According to this configuration, the lens holding frame 20 having the plurality of screw fixing portions 25A to 25D can be formed without using a slider in the mold.

[0085] (4) The head-up display device 100 includes: a light source substrate 41 on which a plurality of light sources 41a are mounted; and a heat sink 60g that transfers heat from the light source substrate 41. The lens holder 20 includes a pressing portion 23 that indirectly presses the light source substrate 41 toward the heat sink 60g via the lens 42a. The screw 80 is provided in a direction in which at least a part of the tightening force P of the screw 80 acts as a component force F1 that presses the light source substrate 41 toward the heat sink 60g via the pressing portion 23.

[0086] According to this structure, the thermal contact state between the light source substrate 41 and the heat sink 60g can be ensured, and the heat of the light source substrate 41 can be more reliably released to the heat sink 60g.

[0087] In addition, the present invention is not limited to the above-mentioned embodiments and drawings. It can be appropriately modified (including deletion of components) within the scope of not changing the gist of the present invention. An example of the modification is described below.

[0088] (Variation Example)

[0089] In the above embodiment, each screw fixing portion 25A to 25D has two U-shaped grooves 26 and 27, but may also have three or more U-shaped grooves arranged in the direction of the central axis J. For example, Fig.11 As shown, the screw fixing portion 225A may also include three U-shaped grooves 26b, 27b, and 28b. The U-shaped grooves 27b → 28b → 26b overlap in the order of the end surface of the screw hole portion 60i. The U-shaped grooves 26b and 27b open in the same direction (in this example, the opposite direction Cd), and the U-shaped grooves 26b, 27b, and 28b open in opposite directions to each other.

[0090] In the above embodiment, the angle of the central axis J with respect to the light traveling direction of the illumination light IL is set to be smaller than 90°, for example, in the range of 0° to 89°, but the present invention is not limited thereto and may be greater than 90°.

[0091] In the above embodiment, the U-shaped groove portion 26 opens toward the light traveling direction of the illumination light IL, and the U-shaped groove portion 27 opens toward the opposite direction Cd, but it may also be the other way around, with the U-shaped groove portion 26 opening toward the opposite direction Cd and the U-shaped groove portion 27 opening toward the light traveling direction of the illumination light IL.

[0092] In the above-described embodiment, the head-up display device 100 may include a folding mirror that reflects the display light L from the display unit 10 toward the concave mirror 30. The folding mirror is a plane mirror or a concave mirror.

[0093] In the above embodiment, the screw fixing portions 25A to 25D are used to fix the lens holder 20 to the housing 60 , but may be used to fix the shield cover 62 , the display panel holder 12 , or the display panel cover 11 , which is a cylindrical member, to the housing 60 .

[0094] The number of screw fixing portions 25A to 25D for one tubular member is not limited to four, and may be one to three or five or more.

[0095] The U-shaped grooves 26 and 27 may be formed as V-shaped grooves.

[0096] The pressing portion 23 presses the light source substrate 41 toward the heat sink 60 g indirectly via the lens 42 a , but may press the light source substrate 41 toward the heat sink 60 g directly.

[0097] The screw through hole 25h may be threaded so as to be screwed with the shaft of the screw 80 .

[0098] In the above embodiment, the head-up display device 100 is mounted on the vehicle 200, but may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. In addition, the projection target is not limited to the front windshield, but may be a dedicated combiner.

Claims

1. A head-up display device comprising: a light source that emits illuminating light; A display unit that receives the illumination light and emits display light; and a cylindrical member through which the illumination light or the display light passes, The head-up display device is characterized in that: The cylindrical member includes a screw fixing portion having a screw passing hole through which the shaft of the screw passes, and is fixed to the fixed portion by the screw. The screw fixing portion comprises: a first groove portion forming a first portion of the entire circumference of the screw through hole; and a second groove portion that forms a second portion different from the first portion in the entire circumference of the screw through hole, The first groove portion and the second groove portion are provided at offset positions so as not to overlap with each other in the light traveling direction of the illumination light or the display light.

2. The head-up display device according to claim 1, characterized in that: The first groove is in a U-shape or a V-shape that opens toward the light traveling direction. The second groove portion is in a U-shape or a V-shape that opens in a direction opposite to the light traveling direction. The screw passage hole is formed at a position where the first groove portion and the second groove portion overlap when viewed from the direction of the central axis of the screw.

3. The head-up display device according to claim 1 or 2, characterized in that: The cylindrical member includes a plurality of the screw fixing portions, which are arranged at offset positions so as not to overlap in the light traveling direction.

4. The head-up display device according to claim 1 or 2, characterized in that: The head-up display device comprises: a light source substrate on which a plurality of the light sources are mounted; and a heat sink that transfers heat from the light source substrate, The cylindrical member includes a pressing portion that directly or indirectly presses the light source substrate toward the heat sink. The screw and the screw fixing portion are provided in a direction in which at least a part of the fastening force of the screw acts as a component force for pressing the light source substrate toward the heat sink via the pressing portion.

Images