JP6604910B2 - Image display device and head-up display device - Google Patents

Description

  The present invention relates to an image display device and a head-up display device including the same.

  Conventionally, in a head-up display that displays a plurality of vehicle information, it is desired to form corresponding virtual images at different distances as viewed from the driver depending on the type of information. For example, the vehicle speed is displayed on the front side, and navigation information such as an instruction arrow for turning left and right is displayed on the back side. The vehicle display device described in Patent Literature 1 is a device that reflects a display image projected from a display body in an instrument panel by a reflector on the inner surface of the windshield and displays it as a virtual image in front of the windshield. In this vehicular display device, in order to display a plurality of information, the display body is composed of a plurality of display boards having different optical path distances to the reflector, thereby presenting a plurality of virtual images at different positions. I am doing so.

JP 2004-168230 A

  However, in the vehicle display device disclosed in Patent Document 1, a plurality of virtual images can be formed at different positions. However, since a plurality of display plates are required, the number of parts is increased, making it difficult to reduce costs. ing. In addition, since the display body is composed of multiple display boards, multiple information with different projection distances can be displayed in a small display range, but information with the same projection distance is displayed large on the entire reflector. It was difficult to do.

  Therefore, the present invention provides an image display device and a head-up display device that can easily switch between a state in which information having the same projection distance is displayed on a large screen and a state in which a plurality of images having different projection distances are displayed. It aims to be realized.

  In order to solve the above problems, an image display device of the present invention includes an intermediate image display body on which an intermediate image is formed, and a first reflective optical element capable of moving back and forth in and out of the optical path of light emitted from the intermediate image display body, And a reflective optical system having a second reflective optical element arranged outside the optical path of the outgoing light from the intermediate image display body, and a first reflective optical element arranged in the optical path of the outgoing light from the intermediate image display body, Alternatively, in the first state in which the first reflective optical element is retracted out of the optical path and the first reflective optical element is disposed in the optical path, a part of the emitted light from the intermediate image display body is Reflected by one reflective optical element, the reflected light is reflected by the second reflective optical element, enters the projection optical system, and is projected onto the projection target by the projection optical system, and the first reflective optical element is retracted out of the optical path. In the second state, the emitted light from the intermediate image display body is Directly incident on the projection optical system, is characterized by being projected onto the projection member by the projection optical system.

  This makes it possible to easily switch between a first state in which a plurality of images having different projection distances are displayed and a second state in which information having the same projection distance is displayed on a large screen at a low cost.

In the image display device of the present invention, it is preferable that the advance / retreat mechanism arranges the first reflective optical element in the optical path or retracts it out of the optical path by rotating the first reflective optical element.
Thereby, arrangement | positioning in the optical path of a 1st reflective optical element and retraction | saving to the exterior of an optical path can be performed easily.

In the image display device of the present invention, it is preferable that the second reflective optical element is set to an angle corresponding to the angle of the first reflective optical element in conjunction with the rotation of the reflective optical element.
Thereby, the reflected light from the first reflective optical element can be reflected from the second reflective optical element in a desired direction. Furthermore, since the angle of the second reflective optical element can be changed, in the second state, it is possible to suppress the incidence of external light into the apparatus, and thereby the noise image caused by the incidence of external light can be reduced. Occurrence can be suppressed.

In the image display device of the present invention, it is preferable that the reflection optical system has an angle that blocks external light from entering the optical path in the second state.
Thereby, in the 2nd state, generation | occurrence | production of the noise image resulting from incidence | injection of external light can be suppressed.

In the image display device of the present invention, it is preferable that the intermediate image display body and the reflection optical system are arranged in one housing.
As a result, the number of housings becomes one, which reduces costs. Furthermore, since an assembly error that occurs when the intermediate image display body and the reflective optical system are housed in separate housings can be suppressed, variations in projection distance and projection position due to the assembly error can be suppressed. .

A head-up display device according to the present invention includes any one of the image display devices described above, and the projection target is a windshield of a vehicle or a combiner disposed inside the windshield.
This realizes a head-up display device that can easily switch between a first state in which a plurality of images having different projection distances are displayed and a second state in which information having the same projection distance is displayed on a large screen at low cost. can do.

  According to the present invention, an image display device and a head-up display device capable of easily switching between a state in which information having the same projection distance is displayed on a large screen and a state in which a plurality of images having different projection distances are displayed are provided at low cost. Can be realized.

It is a side view showing a schematic structure of an image display device and a head up display device concerning a 1st embodiment. It is a block diagram which shows the structure of the image display apparatus which concerns on 1st Embodiment. It is a perspective view which shows arrangement | positioning of a diffuser, a 1st mirror, a 2nd mirror, and a drive motor in 1st Embodiment. (A) is a side view showing the relationship between the diffuser, the first mirror, and the second mirror in the first state, and (B) is the relationship between the diffuser, the first mirror, and the second mirror in the second state. FIG. It is a side view which shows the relationship between a diffuser, a 1st mirror, a 2nd mirror, and a link member in 2nd Embodiment. It is a perspective view which shows schematic structure of the image display apparatus which concerns on 3rd Embodiment. It is a perspective view which shows the structure of the housing | casing shown in FIG.

Hereinafter, an image display device according to an embodiment of the present invention will be described in detail with reference to the drawings.
<First Embodiment>
The first embodiment relates to an image display device 10 and a head-up display device having a windshield 50 as a projection target in the image display device 10. FIG. 1 is a side view showing a schematic configuration of an image display device 10 and a head-up display device according to the first embodiment. FIG. 2 is a block diagram illustrating a configuration of the image display device 10. FIG. 3 is a perspective view showing the arrangement of the diffuser 12, the first mirror 21, the second mirror 22, and the drive motor 23. 4A is a side view showing the relationship between the diffuser 12, the first mirror 21, and the second mirror 22 in the first state, and FIG. 4B is the diffuser 12 and the first mirror in the second state. 21 is a side view showing the relationship between the second mirror 22 and the second mirror 22. FIG. 1 and 3 show a state corresponding to FIG. 4A when the first mirror 21 is in the first state. 1, 3 and 4 show XYZ coordinates as reference coordinates. The Z direction is along the direction of the optical axis 12c of the diffuser 12, and the XY plane is a plane orthogonal to the Z direction.

  As shown in FIG. 1, the image display apparatus 10 includes an optical engine 11, a diffuser 12 as an intermediate image display, a first mirror 21 as a first reflective optical element, and a second as a second reflective optical element. A mirror 22 and a projection mirror 30 as a projection optical system are provided. Further, as shown in FIG. 2, the image display apparatus 10 includes a drive motor 23 and a memory 41. Here, the first mirror 21 and the second mirror constitute a reflection optical system.

  The optical engine 11 is a unit that forms an intermediate image on the diffuser 12 based on the control of the control unit 40. As the optical engine 11, for example, an LED as a light source, a scanning mirror that reflects light emitted from the LED, and reflected light from the scanning mirror is incident on the diffuser 12 as light parallel to the optical axis 12 c of the diffuser 12. A collimator lens. The optical engine 11 and the diffuser 12 are fixed to a base member (not shown) of the image display device 10.

Examples of the diffuser 12 as the intermediate image display body include a microlens array, a diffusion plate, a random phase plate, and a diffraction grating.
The optical engine 11 is driven according to control data stored in the memory 41 in advance corresponding to an image formed on the diffuser 12.

  The scanning mirror of the optical engine 11 as a two-dimensional scanner has a reflecting surface that rotates about two rotation axes that are orthogonal to each other. In this scanning mirror, one line of light is incident on the collimator lens by rotation about the first rotation axis, and after a predetermined amount of rotation about the second rotation axis, By rotating around one rotation axis, the next one line of light enters the collimator lens, and by repeating these, one frame of light is irradiated onto the collimator lens. The light irradiated to the collimator lens is emitted to the diffuser 12, and an intermediate image is formed on the diffuser 12.

  In place of the scanning mirror, DMD (digital mirror device) or LCOS (trademark, Liquid crystal on silicon) can also be used. When DMD is used, incident light from a light source is reflected by each of a plurality of micromirrors arranged in a matrix, and an intermediate image is formed on the diffuser 12. The LCOS can be either a transmission type or a reflection type, and an intermediate image is formed on the diffuser 12 by transmitted light or reflected light from the LCOS.

  Furthermore, instead of the optical engine 11 and the diffuser 12, a self-luminous device such as an LCD (liquid crystal display) or an EL element (electroluminescence element) can be used.

The second mirror 22 as the second reflective optical element is fixed to a base member (not shown) of the image display device 10 and is disposed outside the optical path P of the emitted light from the diffuser 12. The second mirror 22 is disposed so as to be parallel to the first mirror 21 in the first state shown in FIG. 4A when viewed along the X direction. With this inclined arrangement, the light L12 reflected by the reflecting surface 21r of the first mirror 21 and traveling along the Y direction is reflected by the reflecting surface 22r of the second mirror 22 and projected as reflected light L13 along the Z direction. The light enters the mirror 30.
The arrangement of the first mirror 21 and the second mirror 22 is such that the light emitted from the diffuser 12 is reflected by the first mirror 21 and the second mirror 22 in this order and does not enter the projection mirror 30 without returning to the diffuser 12. Can be arbitrarily set.

  The first mirror 21 as the first reflective optical element is rotated around the rotation shaft 21c by the drive motor 23 that is rotated under the control of the control unit 40. The drive motor 23 is fixed to a base member (not shown) of the image display device 10. As shown in FIG. 3, the rotation shaft 21 c is fixed to the first mirror 21 so as to extend along the width direction (X direction) of the first mirror 21, and ends in the longitudinal direction (X direction). The part is provided with a gear 21g concentrically. The gear 21g meshes with a gear 23g provided at the tip of the drive shaft 23c of the drive motor 23, and the drive motor 23 drives the rotation shaft 21c via the gears 23g and 21g. At the same time, the first mirror 21 rotates. Thereby, the drive motor 23 and the rotating shaft 21c function as an advance / retreat mechanism that places the first mirror 21 in the optical path P of the light emitted from the diffuser 12, or retracts the first mirror 21 to the outside of the optical path P. To do.

  Further, in the first mirror 21, a counterweight 21w having a predetermined weight is provided at an end portion on the diffuser 12 side so as to extend in parallel with the rotation shaft 21c. By providing the counterweight 21w, it is possible to suppress minute vibrations when the first mirror 21 is rotated, and thereby the rotation of the first mirror 21 can be stabilized.

  Further, a damper member 24 is provided on the upper wall portion 10 a of the base member of the image display device 10. The damper member 24 is made of an elastic material such as a rubber material. The damper member 24 is a projection mirror 30 in the first mirror 21 in a state (second state shown in FIG. 4B) in which the first mirror 21 is rotated to be substantially parallel to the optical axis 12c of the diffuser 12. It arrange | positions so that the upper surface 21u of the edge part of a side may contact elastically. Thus, in the second state, the upper surface 21u of the end portion of the rotated first mirror 21 comes into contact with the damper member 24, whereby the rotation of the first mirror 21 is restricted, and the second mirror 21 State is maintained.

The first mirror 21 configured as described above is rotated by the drive of the drive motor 23, and takes one of the first state shown in FIG. 4A and the second state shown in FIG. 4B. .
As shown in FIG. 4A, in the first state, the first mirror 21 is disposed in the optical path P of the emitted light from the diffuser 12 that is emitted from the emitting surface 12a of the diffuser 12 along the vertical direction (Z direction). The reflecting surface 21r of the first mirror 21 is disposed at a predetermined angle with respect to the optical axis 12c of the diffuser 12. This predetermined angle is an angle larger than 0 and smaller than 90, and is set in accordance with the position and angle of the second mirror 22, and in this embodiment, the second mirror 22 disposed below the Y direction. It is set to be parallel to the reflecting surface 22r. In such a first state, out of the light emitted from the diffuser 12, the light L 11 incident on the first mirror 21 is reflected by the reflecting surface 21 r and enters the second mirror 22. The light incident on the second mirror 22 is reflected by the reflecting surface 22r of the second mirror 22, and enters the projection mirror 30 as reflected light L13 along the Z direction.
On the other hand, the light L 21 that has not entered the first mirror 21 directly enters the projection mirror 30.

  On the other hand, in the second state, as shown in FIG. 4B, the first mirror 21 is arranged so that the reflecting surface 21r is along the Z direction by turning, and the optical path of the emitted light from the diffuser 12 It is in a state of being retracted to the outside of P. Thereby, the outgoing lights L31 and L32 from the diffuser 12 do not enter either the first mirror 21 or the second mirror 22, but directly enter the projection mirror 30.

  As shown in FIG. 1, the projection mirror 30 as the projection optical system is a concave mirror (magnifying mirror) having a reflecting surface 30r on the diffuser 12 side. Image light including an image formed by the diffuser 12 is magnified and reflected by the projection mirror 30. The reflected light from the projection mirror 30 is projected onto the display area of the windshield 50 of the vehicle as the projection target. Since the windshield 50 functions as a semi-reflective surface, the incident image light is reflected toward the driver as the subject, and a virtual image is formed in front of the windshield 50, so that the driver's eyes E It appears that information corresponding to the intermediate image formed on the diffuser 12 is displayed in front of the steering wheel.

  In the first state shown in FIG. 1 and FIG. 4A, the light L 21 that is directly incident on the projection mirror 30 without entering the first mirror 21 out of the light emitted from the diffuser 12 is reflected by the projection mirror 30. Then, the light enters the windshield 50 and is reflected by the windshield 50, and a virtual image 51 is formed at a position in front of the windshield 50. Further, the light L13 that is reflected by the first mirror 21 and the second mirror 22 in order and incident on the projection mirror 30 out of the light emitted from the diffuser 12 is reflected by the projection mirror 30 and incident on the windshield 50, and the windshield. A virtual image 52 is formed at a position in front of the windshield 50 while being reflected at 50. There is a difference in the optical path length from the diffuser 12 to the projection mirror 30 and the light incident on the projection mirror 30 after being sequentially reflected by the first mirror 21 and the second mirror 22 until reaching the windshield 50. Therefore, the distance between the corresponding virtual images 51 and 52 and the windshield 50 also differs depending on the optical path length, and corresponds to the light L21 that is directly incident on the projection mirror 30 without being incident on the first mirror 21. The virtual image 52 is formed more forward than the virtual image 51 to be performed. Therefore, since the two virtual images 51 and 52 are formed at different positions in the depth direction (Z direction) as seen from the driver, it is possible to display different information at different positions. It is possible to display desired information at a desired position.

  On the other hand, in the second state shown in FIG. 4B, the emitted light from the diffuser 12, for example, the emitted lights L21 and L31 shown in FIG. 4B, are reflected by the first mirror 21 and the second mirror 22. Without being directly incident on the projection mirror 30, it is reflected by the projection mirror 30, enters the windshield 50, is reflected by the windshield 50, and forms a virtual image at the front position of the windshield 50. Accordingly, information can be displayed in a large area that is not divided at the front position of the windshield 50, and a plurality of information can be formed at different positions by the rotation of the first mirror 21 by the drive motor 23. It is possible to easily switch between the first state and the second state in which a single piece of information is displayed on a large screen at a desired timing according to the driving situation.

  As described above, according to the first embodiment, the first state in which a plurality of images with different projection distances are displayed and the second state in which information with the same projection distance is displayed on a large screen are provided. It is possible to easily switch at a low cost. Further, in order to rotate the first mirror 21 and arrange it in the optical path P, or retract it to the outside of the optical path P, the first mirror 21 is disposed in the optical path P and retracted to the outside of the optical path P. Can be easily performed.

A modification will be described below.
In the first embodiment, the first mirror 21 is rotated about the rotation shaft 21c by the drive motor 23. However, the first mirror 21 is rotated by an actuator other than the drive motor 23, for example, a spring. Or using a solenoid.

  In the first embodiment, the reflection path is formed using the two mirrors of the first mirror 21 and the second mirror 22, and a part of the light emitted from the diffuser 12 is incident on the projection mirror 30. One reflection path may be formed by three or more mirrors.

  4A and 4B, a path directly incident on the projection mirror 30 from the diffuser 12 and a path incident on the projection mirror 30 via the first mirror 21 and the second mirror 22 However, other routes may be provided.

  As long as the light emitted from the diffuser 12 can be sequentially reflected in the first state, an optical element other than a mirror, such as a prism, may be used as the first reflective optical element and the second reflective optical element.

  In the first embodiment, the first mirror 21 is arranged in the optical path P of the emitted light from the diffuser 12 by rotating the first mirror 21 around the rotation shaft 21c by the drive motor 23, or However, instead of this, a mirror fixed at a predetermined angle, for example, the angle shown in FIG. 4A is provided so as to be movable up and down in the Y direction without rotating. May be. This mirror can be moved by an actuator such as a spring or a solenoid, and is arranged at one of two positions inside and outside the optical path P of the light emitted from the diffuser 12. As a result, similarly to the state shown in FIG. 4A, the first state in which the emitted light from the diffuser 12 is reflected to the second mirror 22 side, and the projection mirror without reflecting the emitted light from the diffuser 12 by the mirror. The second state in which the light directly enters 30 can be realized.

  In the first embodiment, the reflected light from the projection mirror 30 is projected onto the windshield 50 as the projection target. However, a combiner is disposed on the side of the windshield 50 as the projection target and projected. A configuration in which the reflected light from the mirror 30 is projected onto the combiner is also possible. In this configuration, since the combiner functions as a semi-reflective surface, the incident image light is reflected toward the driver as the subject and a virtual image is formed at the front position of the windshield 50.

Second Embodiment
The image display apparatus according to the second embodiment will be described with reference to FIG. FIG. 5 is a side view showing the relationship among the diffuser 112, the first mirror 121, the second mirror 122, and the link member 125 in the second embodiment. In FIG. 5, the 1st state of the 1st mirror 121, the 2nd mirror 122, and the link member 125 is shown as the continuous line, and the 2nd state is shown with the broken line. FIG. 5 shows XYZ coordinates as reference coordinates. The Z direction is along the direction of the optical axis 112c of the diffuser 112, and the XY plane is a plane orthogonal to the Z direction.

  The second embodiment is different from the first embodiment in that two mirrors 121 and 122 serving as reflection optical systems rotate in conjunction with each other. Since the optical engine 11 and the projection mirror 30 of the first embodiment have the same configuration, arrangement, and effects in the second embodiment, the description thereof is omitted. Moreover, the diffuser 112 (FIG. 5) of 2nd Embodiment also has the structure, arrangement | positioning, and effect similar to the diffuser 12 of 1st Embodiment.

  Similar to the first mirror 21 of the first embodiment, the first mirror 121 as the first reflecting optical element is rotated around the rotation shaft 121c by the drive motor 123 that is rotated by the control of the control unit 40. In FIG. 5, a first state indicated by a solid line and a second state indicated by a broken line are taken. The rotation shaft 121c, the gear 121g, the reflection surface 121r, the counterweight 121w, the drive shaft 123c, and the gear 123g are the rotation shaft 21c, the gear 21g, the reflection surface 21r, the counterweight 21w, and the drive shaft 23c of the first embodiment. And, it has the same configuration and operation effect as the gear 23g. Moreover, although not shown in figure, the damper member is provided similarly to the damper member 24 of 1st Embodiment. In a state where the first mirror 121 is rotated and substantially parallel to the optical axis 112c of the diffuser 112 (second state indicated by a broken line in FIG. 5), the upper surface of the end portion of the first mirror 121 on the projection mirror 30 side. 121u elastically contacts the damper member, and the rotation range of the first mirror 121 is restricted. Here, the drive motor 123 and the rotating shaft 121c are an advancing / retreating mechanism that places the first mirror 121 in the optical path P2 of the light emitted from the diffuser 112, or retracts the first mirror 121 to the outside of the optical path P2. .

  The upper end portion of the link member 125 is connected to the end portion 121e of the first mirror 121 on the projection mirror 30 side, and the lower end portion of the ring member 125 is connected to the second mirror 122 as a second reflecting optical element. An end 122e on the projection mirror 30 side is connected. The end of the second mirror 122 on the diffuser 112 side is rotatably supported with respect to a rotation shaft 122c fixed to a base member (not shown) of the image display device. Further, the link member 125 is provided at a position that does not obstruct the progress of the light emitted from the diffuser 112, for example, at both ends in the X direction of the first mirror 121 and the second mirror 122.

In the above configuration, when the first mirror 121 rotates about the rotation shaft 121 c according to the operation of the drive motor 123, the second mirror 122 connected by the link member 125 moves to the movement of the first mirror 121. In conjunction with this, it rotates about the rotation shaft 122c and takes either a first state indicated by a solid line in FIG. 5 or a second state indicated by a broken line. In the example shown in FIG. 5, the first mirror 121 and the second mirror 122 rotate so as to maintain a substantially parallel relationship when viewed from the X direction, and in the first state indicated by the solid line, the first mirror 121. The reflecting surface 121r of the second mirror 122 and the reflecting surface 122r of the second mirror 122 are at a predetermined angle with respect to the optical axis 112c of the diffuser 112, and in the second state indicated by the broken line, it follows the direction of the optical axis 112c of the diffuser 112. positioned. Here, the predetermined angle in the first state is an angle larger than 0 and smaller than 90. In addition, the reflecting surface 121r of the first mirror 121 is located in the optical path P2 of the emitted light from the diffuser 112 in the first state, and is retracted to the outside of the optical path P2 in the second state. On the other hand, the reflecting surface 122r of the second mirror 122 is located outside the optical path P2 in both the first state and the second state.
Note that the arrangement of the first mirror 121 and the second mirror 122 is such that the light emitted from the diffuser 112 is reflected back in the order of the first mirror 121 and the second mirror 122 without entering the diffuser 112, and enters the projection mirror 30. Can be arbitrarily set.

In the first state, as shown by the solid line in FIG. 5, the incident light L111 to the first mirror 121 out of the outgoing light from the outgoing surface 112a of the diffuser 112 is reflected by the reflective surface 121r, and the reflected light L112 is The light incident on the second mirror 122 and further reflected by the reflecting surface 122r of the second mirror 122 enters the projection mirror 30 as reflected light L113 along the Z direction.
On the other hand, the light L121 that has not entered the first mirror 121 directly enters the projection mirror 30.

  On the other hand, in the second state, as shown by the broken lines in FIG. 5, the first mirror 121 and the second mirror 122 are arranged so that the respective reflecting surfaces 121r and 122r are along the Z direction by rotation. In this state, the light exits from the diffuser 112 to the outside of the optical path P2. Thereby, the emitted light L121 from the diffuser 112 does not enter either the first mirror 121 or the second mirror 122 but directly enters the projection mirror 30.

According to the second embodiment, by operating the drive motor 123, the first mirror 121 and the second mirror 122 can be rotated in conjunction with each other. The light can be reflected from the two mirrors 122 in a desired direction. Furthermore, since the angle of the second mirror 122 can be changed, in the second state, it is possible to suppress the incidence of external light into the apparatus, thereby suppressing the generation of noise images due to external light. it can.
Other operations, effects, and modifications are the same as those in the first embodiment.

<Third Embodiment>
An image display apparatus according to the third embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view illustrating a schematic configuration of the image display apparatus according to the third embodiment. FIG. 7 is a perspective view showing the configuration of the housing 220 shown in FIG. FIG. 6 shows the relationship between the diffuser 212, the first mirror 221 and the second mirror 222 in the first state, and FIG. 7 shows the diffuser 212, the first mirror 221 and the second mirror in the second state. The relationship of the mirror 222 is shown. 6 and 7 show XYZ coordinates as reference coordinates. The Z direction is along the direction of the optical axis 212c of the diffuser 212, and the XY plane is a plane orthogonal to the Z direction.

  In the third embodiment, a diffuser 212 as an intermediate image display body, two mirrors 221 and 222 as reflection optical systems are arranged in a common housing 220, and two projection mirrors are used as projection optical systems. The point provided with 231 and 232 is different from the first embodiment.

  As shown in FIG. 6, the image display device according to the third embodiment includes an optical engine 211, a housing 220 that houses a diffuser 212 and two mirrors 221 and 222, and two projection mirrors 231 and 232. These are arranged on the base member 200b of the image display device. The optical engine 211 has the same configuration as the optical engine 11 of the first embodiment, and is arranged so that the emitted light enters the diffuser 212 in the housing 220 along the optical axis 212 c of the diffuser 212. The light emitted from the housing 220 is reflected and enlarged in the order of the first projection mirror 231 and the second projection mirror 232, and the reflected light is projected onto the windshield of the vehicle, and is directed to the driver as in the first embodiment. And a virtual image is formed in front of the windshield.

  As shown in FIGS. 6 and 7, the housing 220 has a substantially rectangular parallelepiped outer shape. As shown in FIG. 7, a diffuser 212 is fixed to the back surface 220 a on the optical engine 211 side of the housing 220 so that light emitted from the optical engine 211 can be directly incident thereon. The diffuser 212 has the same configuration, arrangement, and operational effects as the diffuser 12 of the first embodiment.

As shown in FIG. 7, an opening 220 p having a shape corresponding to the diffuser 212 is provided on the front surface 220 b of the housing 220 on the first projection mirror 231 side. The opening 220p has a rectangular shape when viewed from the Z direction, and the center thereof is provided on the optical axis 212c of the diffuser 212.
In addition, the housing 220 is provided with two side surfaces 220c and 220d that face each other in the X direction so as to extend along the Z direction, and prevents external light from entering from the outside of the housing 220.
With such a configuration, an optical path from the exit surface 212a of the diffuser 212 toward the opening 220p is formed in the housing 220 along the Z direction.

  As shown in FIG. 7, a first mirror 221 as a first reflective optical element is rotatably supported on the upper surface 220e of the housing 220 via a rotation shaft 221c. The rotation shaft 221c is driven by a drive motor (not shown), and the first mirror 221 rotates about the rotation shaft 221c as the rotation shaft 221c rotates. As a result, the first mirror 221 takes one of the first state shown in FIG. 6 and the second state shown in FIG. In the first state, the first mirror 221 is disposed in an inclined state in the optical path of the light emitted from the diffuser 212. In the second state, the first mirror 221 is disposed so as to extend along the Z direction. Then, it is retracted to the outside of the optical path of the emitted light from the diffuser 212. In the second state, the first mirror 221 closes the upper surface 220e of the housing 220 and shields the incident of external light into the housing 220.

  Here, between the drive motor (not shown) for driving the rotation shaft 221c and the rotation shaft 221c, a gear and a drive shaft are provided as in the first mirror 21 and the drive motor 23 of the first embodiment. Although not shown in FIG. 6 and FIG. Moreover, it is preferable to provide a counterweight on the first mirror 221 similarly to the first mirror 21 of the first embodiment. Furthermore, similarly to the damper member 24 of the first embodiment, it is preferable to provide a damper member on the upper surface 220e of the housing 220, thereby restricting the rotation of the first mirror 221. Here, the rotation shaft 221c and a drive motor (not shown) are an advancing / retreating mechanism that places the first mirror 221 in the optical path of the light emitted from the diffuser 212, or retracts the first mirror 221 to the outside of the optical path. is there.

  As shown in FIG. 7, a second mirror 222 as a second reflective optical element is rotatably supported on the lower surface 220f of the housing 220 via a rotation shaft 222c. The rotation shaft 222c is driven by a drive motor (not shown), and the second mirror 222 is centered on the rotation shaft 222c outside the optical path of the light emitted from the diffuser 212 according to the rotation of the rotation shaft 222c. As a result, the second mirror 222 takes one of the first state shown in FIG. 6 and the second state shown in FIG. In the first state, the second mirror 222 is disposed in an inclined state corresponding to the first mirror 221, and in the second state, the second mirror 222 is disposed so as to extend along the Z direction. Further, in the second state, the second mirror 222 closes the lower surface 220f of the housing 220 and shields external light from entering the housing 220.

Further, like the first mirror 21 and the drive motor 23 of the first embodiment, gears and a drive shaft are provided between the drive motor (not shown) and the rotating shaft 222c. In FIG. 7, these are not shown. The second mirror 222 is preferably provided with a counterweight as in the first mirror 21 of the first embodiment. Further, similarly to the damper member 24 of the first embodiment, it is preferable to provide a damper member on the lower surface 220f of the housing 220, thereby restricting the rotation of the second mirror 222.
The first mirror 221 and the second mirror 222 are preferably synchronized with the operation of a drive motor for rotating the first mirror 221 and the second mirror 222, whereby the projection image can be switched at an appropriate timing.

In the first state, the first mirror 221 is disposed in the optical path of the outgoing light from the outgoing surface 212a of the diffuser 212, and the reflective surface 221r makes a predetermined angle with respect to the optical axis 212c of the diffuser 212. Further, the second mirror 222 is inclined downward relative to the lower surface 220f of the housing 220. In this state, as shown in FIG. 6, the light L211 that has entered the first mirror 221 out of the light emitted from the diffuser 212 is reflected by the reflecting surface 221r and enters the second mirror 222. The light L212 that has entered the second mirror 222 is reflected by the reflecting surface 222r of the second mirror 222, and enters the first projection mirror 231 as reflected light L213 along the Z direction.
On the other hand, the light L <b> 221 that has not entered the first mirror 221 directly enters the first projection mirror 231.

  On the other hand, in the second state shown in FIG. 7, the first mirror 221 is disposed so that the reflecting surface 221r is along the Z direction by rotation and retracted to the outside of the optical path of the emitted light from the diffuser 212. It has become. Thereby, the light emitted from the diffuser 212 does not enter either the first mirror 221 or the second mirror 222 but directly enters the first projection mirror 231.

The first projection mirror 231 and the second projection mirror 232 are concave mirrors (magnifying mirrors) that sequentially reflect and magnify light emitted from the housing 220, and constitute a projection optical system. Image light including an image formed by the diffuser 212 is enlarged and reflected in turn by these projection mirrors 231 and 232. The reflected light from the second projection mirror 232 is projected onto the display area of the windshield 50 of the vehicle as the projection target. Since the windshield 50 functions as a semi-reflective surface, the incident image light is reflected toward the driver as the subject and a virtual image is formed at the front position of the windshield 50.
One of the first projection mirror 231 and the second projection mirror 232 may be a mirror that does not have an enlargement function. Further, the projection optical system may be constituted by three or more concave mirrors or mirrors.

According to the image display device of the third embodiment, since the number of housings is one, the cost can be reduced. Furthermore, since an assembly error that occurs when the diffuser and the reflective optical system are housed in separate housings can be suppressed, variations in projection distance and projection position due to the assembly error can be suppressed.
Other operations, effects, and modifications are the same as those in the first embodiment.
Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment, and can be improved or modified within the scope of the purpose of the improvement or the idea of the present invention.

  As described above, the image display device and the head-up display device according to the present invention are useful when it is necessary to switch between simultaneous projection of a plurality of pieces of information and display of a single piece of information on a large screen.

DESCRIPTION OF SYMBOLS 10 Image display apparatus 11 Optical engine 12, 112 Diffuser 12a, 112a Output surface 12c, 112c Optical axis 21, 121 1st mirror 21c, 121c Rotating shaft 21g, 121g Gear 21r, 121r Reflecting surface 21w, 121w Counterweight 22, 122 Second mirror 22r, 122r Reflective surface 23, 123 Drive motor 23c, 123c Drive shaft 23g, 123g Gear 24 Damper member 30 Projection mirror 30r Reflective surface 40 Control unit 41 Memory 50 Wind shield 51, 52 Virtual image 121e, 122e End portion 122c times Driving shaft 125 Link member 200b Base member 211 Optical engine 212 Diffuser 212a Outgoing surface 212c Optical axis 220 Housing 220p Opening 221 First mirror 221c Rotating shaft 221r Reflection 222 second mirror 222c pivot shaft 222r reflecting surface 231 first projection mirror 232 second projection mirror

Claims (6)

An intermediate image display body on which an intermediate image is formed;
Reflective optics having a first reflective optical element capable of moving in and out of the optical path of the outgoing light from the intermediate image display body and a second reflective optical element arranged outside the optical path of the outgoing light from the intermediate image display body The system,
The first reflective optical element is disposed in the optical path of the light emitted from the intermediate image display body, or an advance / retreat mechanism for retracting the first reflective optical element out of the optical path,
In the first state in which the first reflective optical element is disposed in the optical path, a part of the emitted light from the intermediate image display body is reflected by the first reflective optical element, and the reflected light is the second light. Reflected by the reflective optical element and incident on the projection optical system, and further projected onto the projection object by the projection optical system,
In the second state in which the first reflective optical element is retracted out of the optical path, the emitted light from the intermediate image display body is directly incident on the projection optical system and is projected onto the projection target by the projection optical system. An image display device.   The said advancing / retreating mechanism arrange | positions the said 1st reflective optical element in the said optical path, or retracts | saves out of the said optical path by rotating the said 1st reflective optical element. Image display device.   The image display apparatus according to claim 2, wherein the second reflective optical element is set to an angle corresponding to an angle of the first reflective optical element in conjunction with rotation of the reflective optical element.   4. The image display device according to claim 2, wherein the reflection optical system has an angle that blocks external light from entering the optical path in the second state. 5.   5. The image display device according to claim 1, wherein the intermediate image display body and the reflection optical system are arranged in one housing. 6. An image display device according to any one of claims 1 to 5, comprising:
The head-up display device, wherein the projection target is a windshield of a vehicle or a combiner disposed inside the windshield.

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