JP7294342B2 - head-up display device - Google Patents

Description

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

2. Description of the Related Art Conventionally, a head-up display device has been known that includes a display unit that emits display light that represents an image, and a concave mirror that reflects the display light from the display unit onto a projection member. For example, the concave mirror described in Patent Literature 1 includes a concave mirror body and a holding plate that supports the concave mirror body. One end of the coil spring is locked to the holding plate, and the other end of the coil spring is locked to the case. Vibration of the concave mirror is suppressed by applying force to the holding plate with the coil spring.

JP 2011-131651 A

Also, in order to detect the position of the concave mirror, it is conceivable that a push switch is pushed by a lever that rotates together with the concave mirror when the concave mirror reaches a predetermined position. In this case, the holding plate receives reaction force from the push switch via the lever when the push switch is pushed down.
When a push switch for detecting the position of the concave mirror is applied to the configuration of Patent Document 1, when the reaction force from the push switch and the force applied by the coil spring are balanced in the holding plate, the force applied by the coil spring is applied to the push switch. is canceled by the reaction force from As a result, the function of the coil spring is disabled, and there is a possibility that the vibration of the concave mirror cannot be suppressed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a head-up display device capable of suppressing vibration of a reflecting mirror.

In order to achieve the above object, a head-up display device according to an aspect of the present invention includes:
A head-up display device comprising: a display unit that emits display light; and a mirror unit that reflects the display light from the display unit onto a projected member,
The mirror unit is
a reflecting mirror including a mirror surface that reflects the display light;
a reflector holder having a lever and holding the reflector;
a mirror driving unit that rotates the reflecting mirror holder together with the reflecting mirror about a rotation axis;
a coil spring having a first end that engages with the reflecting mirror holder and a second end that engages with the object to be engaged;
a switch unit that is pushed by the lever when the reflector is in a predetermined position;
The coil spring is arranged such that the coil axis of the coil spring is tangential to the direction of rotation of the reflector about the rotation axis when the reflector is at the predetermined position.

ADVANTAGE OF THE INVENTION According to this invention, it is a head-up display apparatus. WHEREIN: Vibration of a reflecting mirror can be suppressed.

1 is a schematic diagram of a vehicle equipped with a head-up display device according to an embodiment of the present invention; FIG. 1 is a schematic diagram showing the configuration of a head-up display device according to one embodiment of the present invention; FIG. 1 is a perspective view of part of a head-up display device according to an embodiment of the invention; FIG. 1 is a perspective view of part of a head-up display device according to an embodiment of the invention; FIG. 1 is a perspective view of part of a head-up display device according to an embodiment of the invention; FIG. 1 is an exploded perspective view of a concave mirror holder, a concave mirror, a motor case and a lever according to one embodiment of the present invention; FIG. FIG. 4 is a schematic diagram of a concave mirror and a coil spring when the concave mirror is in a parking position according to one embodiment of the present invention; FIG. 4A is a schematic diagram of a concave mirror and a coil spring when the concave mirror according to one embodiment of the present invention is in the display position; (a) and (b) are graphs showing the relationship between the angle of the concave mirror and the torque applied to the concave mirror according to a comparative example, and (c) is the relationship between the angle of the concave mirror and the torque applied to the concave mirror according to one embodiment of the present invention. is a graph showing

An embodiment of a head-up display device according to the present invention will be described with reference to the drawings.

As shown in FIG. 1 , head-up display device 100 is installed in a dashboard of vehicle 200 . The head-up display device 100 emits display light L representing an image toward a windshield 201, which is an example of a projected member of the vehicle 200. As shown in FIG. The display light L is reflected by the windshield 201 and reaches the viewer 1 (mainly the driver of the vehicle 200). Thereby, the virtual image V is displayed so that it can be visually recognized by the viewer 1 .

As shown in FIG. 2, the head-up display device 100 includes a display section 10, a folding mirror member 20, a mirror unit 30, a housing 60, and a control section .

The housing 60 is made of a non-translucent resin material or a metal material and has a substantially hollow rectangular parallelepiped shape. An opening 61 is formed in the housing 60 at a position facing the windshield 201 . The housing 60 includes a curved plate-shaped window 50 that closes the opening 61 . The window portion 50 is made of a translucent resin material such as acrylic through which the display light L is transmitted. Each component of the head-up display device 100 is housed in the housing 60 .

The display unit 10 emits display light L representing an image under the control of the control unit 70 . The display unit 10 includes, for example, a light source and a liquid crystal display panel, both of which are not shown.

The folding mirror member 20 is made of, for example, a plane mirror, and reflects the display light L emitted from the display section 10 toward the mirror unit 30 . The folding mirror member 20 is formed by, for example, laminating aluminum on a base material made of a resin such as polycarbonate.

As shown in FIG. 3, the mirror unit 30 includes a concave mirror 31 that is an example of a reflecting mirror that reflects the display light L, a concave mirror holder 35 that holds the concave mirror 31, and a mirror drive unit that rotates the concave mirror holder 35 together with the concave mirror 31. 40 and a rotation support part 80 .
In the following description, left and right, up and down, front and back are defined based on the direction when the concave mirror 31 is viewed from the front. 3 to 8, the left is abbreviated as Lf, the right is abbreviated as Rt, the top is abbreviated as Up, the bottom is abbreviated as Dn, the front is abbreviated as Fr, and the back is abbreviated as Bk. . The horizontal direction corresponds to the X direction, the vertical direction corresponds to the Y direction, and the front/back direction corresponds to the Z direction.

The concave mirror 31 is formed in a substantially rectangular plate shape elongated in the X direction and curved along the X direction. The concave mirror 31 has a mirror surface 31a formed on the front side of the concave mirror 31 and reflecting light. The concave mirror 31 is formed by vapor-depositing a reflecting material made of metal such as aluminum on a base material made of synthetic resin having a concave curved surface. The concave mirror 31 magnifies and reflects the display light L reflected by the folding mirror member 20 toward the windshield 201 on the mirror surface 31a. Further, the concave mirror 31 is configured to be rotatable along with the concave mirror holder 35 about the rotation axis Ax extending in the direction perpendicular to the paper surface of FIG.

The concave mirror holder 35 is made of synthetic resin, and supports the concave mirror 31 from its back surface so as to be rotatable about the rotation axis Ax. Specifically, as shown in FIG. 4, the concave mirror holder 35 includes a holder body portion 34 and a rotating shaft portion 39a. The holder main body 34 has a plate shape with a curved surface along the back surface of the concave mirror 31 . The rotating shaft portion 39a is positioned on the right side surface of the holder body portion 34 and has a columnar shape extending along the rotating shaft Ax.

As shown in FIG. 3 , the concave mirror holder 35 has a lever 38 provided at the left end of the holder main body 34 . The lever 38 is positioned so as to sandwich the concave mirror 31 along the rotation axis Ax together with the rotation shaft portion 39a. The lever 38 is formed separately from the holder main body 34 with synthetic resin.

As shown in FIG. 5, the lever 38 includes a lever body portion 38e and a lever base portion 38d that supports the lever body portion 38e. The lever body portion 38e and the lever base portion 38d are integrally formed.
The lever main body 38e has a substantially trapezoidal plate shape and extends from the mirror surface 31a of the concave mirror 31 toward the front side with the thickness direction of the lever main body 38e along the rotation axis Ax.
As shown in FIG. 6 , the lever base portion 38 d is attached to the attached portion 39 b provided at the left end portion of the holder body portion 34 . The lever base portion 38d and the attached portion 39b are positioned by fitting the concave portion and the convex portion, and are fixed by fixing means such as an adhesive agent or screws.

Further, as shown in FIG. 5, the lever body portion 38e includes a rack gear portion 38a and a switch pressing portion 38b.

The rack gear portion 38a is formed on the front end surface of the lever body portion 38e, and has teeth arranged along the Y direction. The rack gear portion 38a meshes with a third gear 44, which will be described later.

The switch pressing portion 38b is positioned on the front side of the lower surface of the lever 38 and has a downward convex shape. The switch pressing portion 38b presses a later-described switch portion 48a of the switch unit 48 when the concave mirror 31 is in the parking position.

The lever base portion 38d includes a spring engaged portion 38c to which a first end portion 45a of the coil spring 45, which will be described later, is engaged. The spring locked portion 38c is positioned above the lever base portion 38d and has a locking hole 38c1 in which the first end portion 45a of the coil spring 45 is hooked.

In addition, as shown in FIG. 6, the lever 38 has a shaft through portion 38f. The shaft passage portion 38f is provided in the lever base portion 38d and has a cylindrical shape extending leftward along the rotation axis Ax. The shaft passing portion 38f is rotatably supported by a rotation support portion 47b of the motor case 47, which will be described later. Therefore, the shaft passing portion 38f rotatably supports the concave mirror holder 35 and the concave mirror 31 about the rotation axis Ax together with the rotating shaft portion 39a of the concave mirror holder 35 shown in FIG.

As shown in FIG. 4, the rotation support part 80 supports the rotation shaft part 39a of the concave mirror holder 35 so that the concave mirror holder 35 can rotate about the rotation axis Ax. Specifically, the rotation support portion 80 includes a case body 81 and a leaf spring 82 . The case body 81 has a box-like shape that is open upward, and a through hole 81a through which the rotating shaft portion 39a of the concave mirror holder 35 passes is formed in the left wall portion 81b of the case body 81 . The case body 81 has therein a slide bearing portion 84 that rotatably supports the rotating shaft portion 39a. The leaf spring 82 is positioned above the rotating shaft portion 39 a and biases the rotating shaft portion 39 a toward the sliding bearing portion 84 .

As shown in FIG. 5, the mirror driving unit 40 includes a mirror driving section 46 including a motor 41, a first gear 42, a second gear 43 and a third gear 44, a coil spring 45, a motor case 47, a switch unit 48 and.

The motor case 47 is made of synthetic resin, for example, accommodates the motor 41 and the switch unit 48, and rotatably accommodates the first gear 42, the second gear 43, and the third gear 44. As shown in FIG.
Further, the motor case 47 has a spring engaged portion 47a to which the second end portion 45b of the coil spring 45 is engaged. The spring engaging portion 47a is located on the back side of the upper surface of the motor case 47 and is formed in a U shape so that the second end portion 45b of the coil spring 45 is engaged therewith.
Further, as shown in FIG. 6, the motor case 47 includes a cylindrical rotation support portion 47b. The shaft-passing portion 38f of the lever 38 is inserted through the rotation support portion 47b. The rotation support portion 47b functions as a slide bearing that rotatably supports the shaft passage portion 38f of the lever 38. As shown in FIG.

As shown in FIG. 5 , the motor 41 is positioned on the lower side and front side in the motor case 47 . The motor 41 moves the lever 38 toward or away from the switch unit 48 via the first gear 42 , the second gear 43 and the third gear 44 under the control of the control section 70 . As a result, the concave mirror holder 35 and the concave mirror 31 rotate about the rotation axis Ax.

The first gear 42 is a cylindrical worm gear extending in the Y direction and fixed to the output shaft (not shown) of the motor 41 . The second gear 43 is a worm wheel that is rotatable around a rotation axis along the X direction and meshes with the first gear 42 . The third gear 44 is a spur gear with a diameter smaller than that of the second gear 43 . The third gear 44 is formed integrally with the second gear 43 and rotates around the same rotation axis as the rotation axis of the second gear 43 . The third gear 44 meshes with the rack gear portion 38 a of the lever 38 .

As shown in FIG. 5, when the motor 41 is driven, the first gear 42 rotates. As a result, the second gear 43 meshing with the first gear 42 rotates integrally with the third gear 44 . Since the third gear 44 meshes with the rack gear portion 38a, as the third gear 44 rotates, the lever 38 approaches or separates from the switch unit 48 while the concave mirror holder 35 and the concave mirror 31 rotate about the rotation axis Ax.

The coil spring 45 has a U-shaped first end 45a that engages with the spring engaged portion 38c of the lever 38 at the first engagement position Pa, and a spring of the motor case 47 at the second engagement position Pb. and a U-shaped second end portion 45b that is locked to the locked portion 47a. The first locking position Pa and the second locking position Pb are located at positions different from the rotation axis Ax in the Y direction, that is, above the rotation axis Ax in this example. Further, the second locking position Pb is located above the first locking position Pa. The coil spring 45 is an extension coil spring, and applies a force to the lever 38 to rotate the concave mirror holder 35 about the rotation axis Ax so that the lever 38 approaches the switch unit 48 due to the elastic force of the coil spring 45 . As a result, the third gear 44 and the rack gear portion 38a can be kept in contact with each other. Therefore, noise and vibration of the concave mirror 31 due to repeated contact and separation between the third gear 44 and the rack gear portion 38a can be suppressed. As shown in FIG. 7, the coil spring 45 is installed such that the coil axis Ic of the coil spring 45 is along the tangential direction D of the rotation direction C of the concave mirror 31 when the concave mirror 31 is in the parking position. The action of the coil spring 45 will be detailed later.

As shown in FIG. 5 , the switch unit 48 has a substantially rectangular parallelepiped shape and is positioned on the lower side and rear side of the motor case 47 . The switch unit 48 includes a switch portion 48a located on the upper surface of the switch unit 48. As shown in FIG. The switch portion 48a has an elastic member (not shown), and when the lever 38 does not apply an external force to the switch portion 48a, the switch portion 48a is in the initial position due to the elastic force of the elastic member. When the concave mirror 31 reaches the parking position, the switch portion 48a is pushed downward by the lever 38 against the elastic force of the elastic member, thereby reaching the pressing position. At this time, as shown in FIG. 7, a reaction force Fr is applied to the lever 38 from the switch portion 48a. The switch unit 48 outputs a detection signal to the controller 70 indicating that the concave mirror 31 has reached the parking position when the switch portion 48a reaches the pressed position.

As shown in FIG. 2 , the control unit 70 includes a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc., and controls the display unit 10 and the motor 41 . By driving the motor 41, the control unit 70 moves the concave mirror 31 to the parking position shown in FIG. 7 or the display shown in FIG. Rotate to reach position.
As shown in FIG. 7, the parking position forms an angle along the Y direction with respect to the display position, and is set in such a direction that outside light such as sunlight is reflected by the concave mirror 31 and does not trace the optical path of the display light L. As shown in FIG. This parking position is set, for example, in a range from a position where the switch pressing portion 38b of the lever 38 contacts the switch portion 48a of the switch unit 48 to a position where the switch pressing portion 38b pushes the switch portion 48a to the pressed position.
As shown in FIG. 8, the display position is at an angle such that the mirror surface 31a of the concave mirror 31 faces the windshield 201 compared to the parking position. It is set in a direction leading to the glass 201 . As an example, the display position is set to a position rotated clockwise by 68° in FIG. 8 with respect to the parking position shown in FIG.
When the ignition of the vehicle 200 is switched from off to on, the control unit 70 drives the motor 41 in the forward direction to move the concave mirror 31 from the parking position to the display angle. Then, when the ignition of the vehicle 200 is switched from ON to OFF, the control unit 70 drives the motor 41 in the reverse direction, thereby moving the concave mirror 31 from the display angle to the parking position. At this time, the control unit 70 determines whether or not the concave mirror 31 has reached the parking position according to whether or not the switch unit 48 has received a detection signal indicating that the concave mirror 31 has reached the parking position.

Next, the action of the concave mirror 31 and the coil spring 45 will be described.
As shown in FIG. 7, when the concave mirror 31 is in the parking position, the coil spring 45 is arranged so that the coil axis Ic of the coil spring 45 is oriented along the tangential direction D in the rotation direction C about the rotation axis Ax of the concave mirror 31. Eggplant. The tangential direction D coincides with the direction in which forces (forces Fb and F2 described later) that rotate the concave mirror holder 35 act.
In other words, when the concave mirror 31 is in the parking position, the virtual line L0 connecting the first locking position Pa and the rotation axis Ax forms an angle α between the coil axis Ic of the coil spring 45 and the coil spring angle α. . The coil spring angle α is set, for example, preferably in the range of 85° to 95°, more preferably 90° when the concave mirror 31 is in the parking position. In order to realize this direction of the coil spring 45, the positional relationship between the spring engaged portion 38c and the spring engaged portion 47a, that is, the positional relationship between the first engaging position Pa and the second engaging position Pb is set. be. When the concave mirror 31 is in the parking position, the coil axis Ic of the coil spring 45 is oriented along the tangential direction D, so that almost all of the force Fa caused by the elastic force of the coil spring 45 is transferred to the force Fb that rotates the concave mirror holder 35. can act as
The spring constant of the coil spring 45 is set so that the force Fb that rotates the concave mirror holder 35 when the concave mirror 31 is in the parking position is greater than the reaction force Fr that the lever 38 receives when the switch unit 48 is pushed. be. As will be described later in detail, this suppresses the balance between the force Fb and the reaction force Fr, thereby suppressing the vibration of the concave mirror 31 .

7 and 8, as the concave mirror 31 rotates toward the display position about the rotation axis Ax, the coil axis Ic of the coil spring 45 inclines with respect to the tangential direction D, The coil axis Ic is no longer along the tangential direction D. As the coil axis Ic inclines with respect to the tangential direction D, the coil spring angle α becomes smaller. As shown in FIG. 8, when the concave mirror 31 reaches the display position, the force F1 generated by the elastic force of the coil spring 45 is divided into a force F3 pushing toward the rotation axis Ax and a force F2 rotating the concave mirror holder 35. be done. This force F3 does not contribute to the rotation of concave mirror 31 . As the coil axis Ic of the coil spring 45 inclines with respect to the tangential direction D, the force F3 increases and the force F2 decreases. Accordingly, as the concave mirror 31 approaches the display position, the extension of the coil spring 45 increases, and although the force F1 generated by the elastic force of the coil spring 45 increases, it does not contribute to the rotation of the concave mirror 31, which accounts for the force F1. The proportion of force F3 increases. Therefore, as shown in FIG. 9C, the inclination of the torque Trq1 for rotating the concave mirror 31, which is applied by the coil spring 45 with respect to the change in the angle β of the concave mirror 31, can be reduced. The effect accompanying this will be described below while comparing the comparative example according to FIGS. 9A and 9B with the present embodiment according to FIG. 9C.

As shown in FIGS. 9A, 9B, and 9C, as the angle β of the concave mirror increases from the parking position Pk toward the display position Ph, the extension of the coil spring 45 increases. The torque Trq1 applied to the concave mirror holder 35 increases with the elastic force of . of the concave mirror 31 approaches the parking position Pk from the display position Ph, the lever 38 pushes the switch portion 48a, and torque Trq2 applied to the concave mirror holder 35 is generated with the reaction force Fr of the switch portion 48a. Torque Trq2 acts in the opposite direction to torque Trq1.
In the comparative example shown in FIG. 9A, when the concave mirror 31 is in the parking position, the coil axis Ic is not aligned with the tangential direction D, and the angle β of the concave mirror 31 approaches the parking position Pk, the torque Trq1 The spring constant of the coil spring 45 is set to be less than Trq2. Therefore, an equilibrium point E1 is generated at which the torque Trq1 and the torque Trq2 are balanced. At this equilibrium point E1, no tension is applied to the concave mirror holder 35, and the third gear 44 and the rack gear portion 38a repeatedly contact and separate, causing noise and vibration of the concave mirror 31. There is a risk of Therefore, as shown in the comparative example of FIG. 9B, by adopting a coil spring with a high spring constant, even when the angle β of the concave mirror approaches the parking position Pk, the torque Trq1 is reduced to the torque Trq2. It is conceivable to make it larger than However, increasing the spring constant of the coil spring increases the motor torque required to rotate the concave mirror, which is not preferable.
Therefore, in the present embodiment, the coil axis Ic is arranged along the tangential direction D when the concave mirror 31 is in the parking position. It is possible to reduce the inclination of the torque Trq1 that rotates the concave mirror 31 and that is applied by the coil spring 45 with respect to the change. Therefore, it is possible to suppress the generation of the equilibrium point E1 at which the torque Trq1 and the torque Trq2 are balanced without increasing the spring constant of the coil spring 45, that is, without increasing the motor torque. Therefore, it is possible to suppress the occurrence of vibration of the concave mirror 31, and it is possible to suppress the occurrence of noise due to repeated contact and separation between the third gear 44 and the rack gear portion 38a.

(effect)
According to the embodiment described above, the following effects are obtained.

(1) The head-up display device 100 includes a display unit 10 that emits display light L, and a mirror unit 30 that reflects the display light L from the display unit 10 onto a windshield 201, which is an example of a projected member. . The mirror unit 30 has a concave mirror 31 including a mirror surface 31a that reflects the display light L, a lever 38, a concave mirror holder 35 that holds the concave mirror 31, and rotates the concave mirror holder 35 together with the concave mirror 31 around the rotation axis Ax. a mirror driving portion 46, a coil spring 45 having a first end portion 45a that engages with the concave mirror holder 35, and a second end portion 45b that engages with a spring engaged portion 47a, which is an example of a portion to be engaged; and a switch unit 48 that is pushed by a lever 38 when the concave mirror 31 is in a parking position, which is an example of a predetermined position. The coil spring 45 is provided so that the coil axis Ic of the coil spring 45 is along the tangential direction D of the rotation direction C about the rotation axis Ax of the concave mirror 31 when the concave mirror 31 is in the parking position.
According to this configuration, when the concave mirror 31 is in the parking position, the coil axis Ic of the coil spring 45 is oriented along the tangential direction D, so that almost all of the force Fa generated by the elastic force of the coil spring 45 is absorbed by the concave mirror 31 . can act as a rotating force Fb. Therefore, when the concave mirror 31 is in the parking position, the force Fb for rotating the concave mirror holder 35 can easily be made larger than the reaction force Fr that the lever 38 receives when the switch unit 48 is pushed. Therefore, the balance between the force Fb and the reaction force Fr is suppressed, thereby suppressing noise in the mirror drive unit 46 and vibration of the concave mirror 31 . In this way, by suppressing the vibration of the concave mirror 31, the display quality of the virtual image V displayed by irradiating the windshield 201 with the display light L can be improved.

(2) The spring constant of the coil spring 45 is set so that the force Fb that rotates the concave mirror holder 35 when the concave mirror 31 is in the parking position is greater than the reaction force Fr that the lever 38 receives when the switch unit 48 is pushed. be done.
This configuration suppresses the balance between the force Fb and the reaction force Fr, thereby suppressing noise in the mirror drive unit 46 and vibration of the concave mirror 31 .

(3) The mirror driving section 46 includes the motor 41, and a first gear 42, a second gear 43, and a third gear 44, which are an example of a gear mechanism that transmits the driving force of the motor 41 to the lever 38. The lever 38 includes a rack gear portion 38a, which is an example of a gear portion that meshes with the third gear 44, a spring engaged portion 38c that engages the first end portion 45a of the coil spring 45, and a spring engaging portion 38c that engages with the first end portion 45a of the coil spring 45, and when the concave mirror 31 is in the parking position. and a switch pressing portion 38 b for pressing the switch unit 48 . The head-up display device 100 has a spring engaged portion 47a, which is an example of a portion to be engaged. A case 47 is provided.
According to this configuration, the lever 38 not only has the function of pushing the switch unit 48 with the switch pressing portion 38b, but also the driving force of the motor 41 with the rack gear portion 38a. and a function of locking the first end portion 45a of the coil spring 45 by the spring locked portion 38c. By making the lever 38 multi-functional in this way, the head-up display device 100 can be configured more simply.

(4) Head-up display device 100 is mounted on vehicle 200 . The mirror drive unit 46 rotates the concave mirror holder 35 between a display position where the mirror surface 31a of the concave mirror 31 faces the windshield 201 and a parking position in which the display position is along the height direction (Y direction) of the vehicle 200. .
According to this configuration, when the concave mirror 31 reaches the parking position, the balance between the force Fb and the reaction force Fr is suppressed as described above. can be suppressed.

(Modification)
In addition, the above-described embodiment can be implemented in the following forms, which are appropriately modified.

In the above embodiment, the spring engaged portion 38c to which the first end portion 45a of the coil spring 45 engages is provided in the lever 38, but the spring engaged portion 38c is a separate member from the lever 38. may be provided in Further, the spring engaged portion 47a to which the second end portion 45b of the coil spring 45 is engaged is provided in the motor case 47, but the spring engaged portion 47a is provided separately from the motor case 47, For example, it may be provided in the housing 60 . Although the position and orientation of the spring engaging portion 38c and the spring engaging portion 47a change, the position of the coil spring 45 changes. It is sufficient if Ic is provided along the tangential direction D.

In the above embodiment, the lever 38 is provided with the rack gear portion 38a that meshes with the third gear 44, but the rack gear portion 38a may be provided separately from the lever 38.

In the above embodiment, the driving force of the motor 41 is transmitted to the lever 38 via the first gear 42, second gear 43 and third gear 44 corresponding to the gear mechanism. And the type is not limited to this. For example, the first gear 42 and the second gear 43 may be omitted and the motor 41 may directly rotate the third gear 44 .

In the above embodiment, the lever 38 pushes the switch unit 48 when the concave mirror 31 is in the parking position. There may be. In this case, for example, the switch unit 48 may be positioned above the lever 38 and the coil spring 45 may be positioned below the lever 38 .

In the above embodiment, as shown in FIG. 3, the lever 38 extends from the mirror surface 31a of the concave mirror 31 toward the front side. good.

In the above embodiment, the lever 38 is formed separately from the holder main body 34 of the concave mirror holder 35, but it may be formed integrally with the holder main body 34. FIG.

The configuration of the head-up display device 100 in the above embodiment can be changed as appropriate. For example, the mirror unit 30 may be directly irradiated with the display light L from the display unit 10 by omitting the folding mirror member 20 . Also, the head-up display device 100 may include a plane mirror instead of the concave mirror 31 .

Although the head-up display device 100 is mounted on the vehicle 200 in the above embodiment, it may be mounted on a vehicle other than the vehicle 200, such as an airplane or a ship. Further, the projection member is not limited to the windshield, and may be a dedicated combiner.

10 display unit 20 folding mirror member 30 mirror unit 31 concave mirror (reflecting mirror)
31a mirror surface 34 holder main body 35 concave mirror holder (reflecting mirror holder)
38 Lever 38a Rack gear portion 38b Switch pressing portion 38c Spring locked portion 38d Lever base portion 38c1 Locking hole 38e Lever body portion 38f Shaft passage portion 39a Rotational shaft portion 39b Attached portion 40 Mirror drive unit 41 Motor 42 First gear 43 Second gear 44 Third gear 45 Coil spring 45a First end 45b Second end 46 Mirror driving part 47 Motor case 47a Spring engaged part 47b Rotation support part 48 Switch unit 48a Switch part 70 Control part 100 Head-up display Device 200 Vehicle 201 Windshield α Coil spring angle C Rotational direction D Tangential direction L Display light V Virtual image Ic Coil axis Pa First locking position Pb Second locking position

Claims (4)

A head-up display device comprising: a display unit that emits display light; and a mirror unit that reflects the display light from the display unit onto a projected member,
The mirror unit is
a reflecting mirror including a mirror surface that reflects the display light;
a reflector holder having a lever and holding the reflector;
a mirror driving unit that rotates the reflecting mirror holder together with the reflecting mirror about a rotation axis;
a coil spring having a first end that engages with the reflecting mirror holder and a second end that engages with the object to be engaged;
a switch unit that is pushed by the lever when the reflector is in a predetermined position;
The coil spring is provided such that when the reflector is at the predetermined position, the coil axis of the coil spring is oriented along a tangential direction in a direction of rotation of the reflector about the rotation axis.
Head-up display device. The spring constant of the coil spring is set so that when the reflector is at the predetermined position, the force for rotating the reflector holder is greater than the reaction force received by the lever when pushing the switch unit. ,
The head-up display device according to claim 1. The mirror drive unit
a motor;
a gear mechanism that transmits the driving force of the motor to the lever,
The lever is
a gear portion meshing with the gear mechanism;
a spring locked portion to which the first end of the coil spring is locked;
a switch pressing portion that presses the switch unit when the reflecting mirror is at the predetermined position;
The head-up display device,
a motor case having the locking target portion and housing the motor, the gear mechanism, and the switch unit;
The head-up display device according to claim 1 or 2. The head-up display device is mounted on a vehicle,
The mirror drive unit is configured to perform the reflection between a display position where the mirror surface of the reflecting mirror faces the projected member and a parking position which is the predetermined position and is oriented along the height direction of the vehicle from the display position. rotate the mirror holder,
The head-up display device according to any one of claims 1 to 3.

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