JP6569318B2 - Optical scanning device - Google Patents

Description

  The present invention relates to an optical scanning device.

  2. Description of the Related Art Conventionally, a head-up display (HUD) device that displays an image superimposed on an observer's field of view by projecting the image onto a projection surface is known.

  Further, a vehicle-mounted virtual image display device including a HUD device, a viewpoint detection camera that captures a driver's eyes, and a gesture detection camera that captures a driver's hand is known (for example, Patent Documents). 1). In this virtual image display device, the driver's line of sight can be specified by detecting the driver's eye position and fingertip position.

  However, in the above-described virtual image display device, a new light source for detecting the driver's eye position, fingertip position, and the like is required in addition to the light source used for displaying an image.

  In view of the above problems, an object of the present invention is to provide an optical scanning device capable of emitting light for detecting the position of an observer without newly providing a light source.

In order to achieve the above object, in one embodiment, an optical scanning device comprises:
A light source;
An incident optical system into which light emitted from the light source is incident;
An optical deflector for two-dimensionally deflecting light emitted from the incident optical system;
A screen including an image forming region in which an image is formed using light deflected by the light deflector;
A reflective optical system that reflects a portion of the light deflected by the optical deflector, and
The reflection optical system is disposed on an optical path of light other than light incident on the image forming region among light deflected by the light deflector ,
A scanning optical system that guides the light deflected by the optical deflector to the screen; and the reflection optical system is provided on a plane on which the scanning optical system is disposed, and is incident on the image forming area. Reflects light in different directions .

  According to this embodiment, it is possible to provide an optical scanning device capable of emitting light for detecting the position of an observer without newly providing a light source.

It is a schematic block diagram of the HUD apparatus which concerns on 1st Embodiment. It is a schematic block diagram of a two-dimensional MEMS mirror. It is a figure explaining an example of the positional relationship between a screen and a reflective mirror. It is a flowchart explaining an example of operation | movement of a HUD apparatus. It is a figure explaining an example of the method of acquiring distance information of a driver. It is a schematic block diagram of the HUD apparatus which concerns on 2nd Embodiment. It is a schematic block diagram of the HUD apparatus which concerns on 3rd Embodiment. It is a schematic block diagram of the HUD apparatus which concerns on 4th Embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

  The optical scanning device of the present invention particularly relates to a head-up display (HUD) device mounted on a vehicle, and can irradiate light for detecting the position of an observer (driver) without newly providing a light source. It is characterized by this.

  In the following embodiments, a case where the optical scanning device is mounted on a vehicle will be described, but the present invention is not limited in this respect.

[First Embodiment]
An example of the configuration of the HUD device according to the first embodiment will be described. FIG. 1 is a schematic configuration diagram of the HUD device according to the first embodiment.

  As shown in FIG. 1, the HUD device 1 is mounted on a vehicle and accommodated in a dashboard DB. The HUD device 1 projects an image on a windshield (windshield) FG of the vehicle, thereby displaying an image (virtual image I) superimposed on the field of view of the driver D of the vehicle. Thereby, the driver D can confirm the information for supporting the driver D such as the vehicle speed, the vehicle state, the road information, and the like, while ensuring the field of view on the vehicle front side (the front landscape of the vehicle).

  The HUD device 1 includes a light source 10, a lens array 20, a MEMS (Micro Electro Mechanical Systems) mirror 30, a folding mirror 40, a screen 50, a concave mirror 60, a first reflecting mirror 70, and a second reflecting mirror 70. A reflection mirror 80 and a light receiver 90 are included. The operation of each part of the HUD device 1 is controlled by a control device such as an electronic control unit (ECU) mounted on the vehicle, for example. The control device will be described later.

  The light source 10 includes red, green, and blue laser light sources. A video signal in accordance with the scanning angle of the MEMS mirror 30 is transmitted to the laser light source of each color, and laser light whose light intensity is modulated in accordance with the signal is emitted. The light whose intensity has been modulated is deflected by the MEMS mirror 30, whereby a target image is displayed on the screen 50.

  The lens array 20 is an example of an incident optical system into which light emitted from the light source 10 enters. Specifically, the lens array 20 collimates the light emitted from the three color laser light sources, the light combining means for combining the collimated three color laser lights, and the combined laser light is condensed. And a condensing lens. The light combining means is not particularly limited as long as three colors of laser light can be combined. For example, a dichroic mirror or a dichroic prism can be used.

  The MEMS mirror 30 is an example of an optical deflector that two-dimensionally deflects light emitted from the lens array 20. Specifically, the MEMS mirror 30 changes the angle of a mirror unit 31 to be described later, for example, to deflect light at a high speed in the horizontal direction and to deflect light at a lower speed than the horizontal direction in the vertical direction. MEMS mirror. Hereinafter, the direction in which light is scanned at a high speed is referred to as a main scanning direction, and the direction in which light is scanned at a relatively low speed with respect to the main scanning direction is referred to as a sub-scanning direction.

  The driving method of the MEMS mirror 30 is not particularly limited, and for example, a piezoelectric driving method, an electromagnetic driving method, and an electrostatic driving method can be used. Hereinafter, the piezoelectric drive type MEMS mirror 30 will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of a two-dimensional MEMS mirror.

  As shown in FIG. 2, the MEMS mirror 30 is connected to a mirror unit 31 including a reflective film formed of a highly reflective material such as aluminum (Al) or platinum (Pt) that reflects light, and the mirror unit 31. The torsion bar 32, the two pairs of first piezoelectric actuators 33 that drive the mirror unit 31 via the torsion bar 32, the movable frame 34 that supports the first piezoelectric actuator 33, and the movable frame 34. It has a pair of second piezoelectric actuators 35 formed in a serpentine shape, and a support portion 36 that supports the second piezoelectric actuator 35.

  In the MEMS mirror 30, a sine wave voltage having a frequency equivalent to the resonance frequency of the mirror unit 31 is applied to the first piezoelectric actuator 33, and the torsion bar 32 is bent to cause periodic vibration about the Y axis as a rotation axis. Is generated. Further, by alternately applying a sawtooth voltage in the opposite direction to the regions 35a and 35b in the second piezoelectric actuator 35 and superimposing a small displacement due to the bending of the meandering second piezoelectric actuator 35, the X axis Generates periodic vibration around the axis of rotation. Thus, light can be scanned at high speed in the main scanning direction (X-axis direction), and light can be scanned in the sub-scanning direction (Y-axis direction) at a lower speed than the main scanning direction.

  The folding mirror 40 is an example of a scanning optical system that guides the light deflected by the MEMS mirror 30 to the screen 50. The folding mirror 40 changes the position of the image formed on the screen 50 by changing its angle.

  The screen 50 includes an image forming area in which an image is formed by light emitted from the folding mirror 40.

  The concave mirror 60 is a mirror that changes the direction of the light emitted from the folding mirror 40 through the screen 50 and reflects the light toward the windshield FG. The concave mirror 60 changes the direction of light reflected toward the windshield FG by changing its angle.

  The first reflection mirror 70 is an example of a reflection optical system that reflects part of the light deflected by the MEMS mirror 30. The first reflection mirror 70 is disposed on the optical path of light other than the light incident on the image forming area among the light deflected by the MEMS mirror 30.

  An example of the position where the first reflection mirror 70 is provided will be described with reference to FIG. FIG. 3 is a diagram for explaining an example of the positional relationship between the screen 50 and the first reflection mirror 70. In FIG. 3, an arrow LB represents light scanned by the MEMS mirror 30. A region indicated by a solid line represents a region where light can be scanned by the MEMS mirror 30 on a plane on which the screen 50 is disposed (hereinafter referred to as “scannable region A”). The area where the screen 50 and the scannable area A overlap represents an area where an image is formed by the light emitted from the folding mirror 40 (hereinafter referred to as “image forming area B”). In the scannable area A, an area that does not overlap the screen 50 represents an area that is not used for image formation (hereinafter, “non-image forming area C”).

  As shown in FIG. 3, the first reflection mirror 70 is provided on a plane on which the screen 50 is disposed, for example. Specifically, the first reflecting mirror 70 is configured to form an image in the scannable area A such as a position that reflects light incident on the non-image formation area C, such as a position in the upper right of the scannable area A. It is provided at a position where light passing through the outside of the region B can be received.

  By the way, in the laser scanning drawing method, light is generally scanned by driving the MEMS mirror 30 in a sine wave, and peaks and valleys of the sine wave (indicated by “P” in FIG. 3). However, since the speed change is large, it is often not used as the image forming region B. Further, at the end of the screen 50, there is a region where a photodetector or the like is arranged for laser scanning control. In the first embodiment, the two-dimensionally scanned laser light is effectively utilized by disposing the first reflecting mirror 70 in a region that is not used as the image forming region B or a region where a photodetector or the like is disposed. can do.

  Further, the position where the first reflection mirror 70 is provided is not limited to the plane on which the screen 50 is disposed. The first reflection mirror 70 may be provided on the optical path of light incident on the non-image forming area C inside the HUD device 1. For example, the first reflection mirror 70 may be disposed on the plane on which the folding mirror 40 is disposed, It can also be between the screen 50. When the first reflection mirror 70 is provided on the plane on which the folding mirror 40 is disposed, the first reflection mirror 70 reflects the light incident on the non-image forming area C in a direction different from the light incident on the image forming area B. A reflection mirror 70 is disposed.

  The first reflection mirror 70 is not particularly limited as long as a part of the light deflected by the MEMS mirror 30 can be reflected, and may be a simple reflection mirror, a one-dimensional MEMS mirror, or a two-dimensional MEMS mirror. An optical deflecting element such as a galvanometer mirror or a polygon mirror may be used. When a light deflection element such as a one-dimensional MEMS mirror or a two-dimensional MEMS mirror, a galvano mirror, or a polygon mirror is used as the first reflection mirror 70, it is possible to scan the light incident on the first reflection mirror 70. Therefore, the scanning range of the light irradiated to the driver D can be expanded.

  The second reflection mirror 80 is a mirror that changes the direction of the light reflected by the first reflection mirror 70 and irradiates the driver D with light. The second reflecting mirror 80 is not particularly limited as long as the direction of the light reflected by the first reflecting mirror 70 can be changed, and may be a simple reflecting mirror, a one-dimensional MEMS mirror, 2 A light deflection element such as a three-dimensional MEMS mirror, a galvano mirror, or a polygon mirror may be used. When a light deflecting element such as a one-dimensional MEMS mirror or a two-dimensional MEMS mirror, a galvano mirror, or a polygon mirror is used as the second reflecting mirror 80, it is possible to scan the light incident on the second reflecting mirror 80. Therefore, the scanning range of the light irradiated to the driver D can be expanded.

  The light receiver 90 detects light reflected by the driver D. And the positional information on the driver | operator D is calculated based on the light detected by the light receiver 90 by the control apparatus mentioned later. A method for calculating the position information of the driver D will be described later. As the light receiver 90, for example, a photodiode or an image sensor can be used.

  The control device controls the operation of each unit of the HUD device 1. Further, the control device acquires the position information of the driver D based on the distance information between the driver D and the light receiver 90 and the distance information stored in advance in a memory or the like. Further, the control device controls, for example, the display position and display content of the image formed on the screen 50 and the position of the eye box based on the position information of the driver D. The eye box means a range in which the driver D can see the image (virtual image I).

  Hereinafter, an example of the operation of the HUD device 1 will be described. FIG. 4 is a flowchart for explaining an example of the operation of the HUD device. FIG. 5 is a diagram illustrating an example of a method for acquiring driver distance information.

  First, as shown in FIG. 5, the control device gives the driver D the light LB reflected by the first reflecting mirror 70 and the second reflecting mirror 80 among the light deflected two-dimensionally by the MEMS mirror 30. By irradiating, the distance information of the driver D is acquired (step S1).

  Specifically, the control device acquires distance information between the driver D and the light receiver 90 by, for example, a time of flight (TOF) method. The TOF method is a method of measuring the distance from the time until the driver D is irradiated with light and the light is detected by the light receiver 90. At this time, since the speed of light is very large compared to the scanning speed of light, if it is known to which position the light is irradiated, it can be determined from which position the light is reflected. .

  In addition, about the irradiation range of the light reflected by the 1st reflective mirror 70 and the 2nd reflective mirror 80, it is not limited only to the driver D, The driver's D and the seat seat on which the driver D is sitting are included. A range is preferable.

  Next, the control device calculates position information such as the sitting position and the sitting posture of the driver D based on the distance information of the driver D acquired in step S1 and the distance information stored in advance in a memory or the like (step). S2).

  Specifically, the control device relates to the distance information between the driver D and the light receiver 90 acquired in step S1 and the distance difference between the chin and neck of the driver D stored in advance in a memory or the like. Based on the information, the boundary between the chin and neck of the driver D is estimated, and the position information of the driver D is acquired.

  Further, the control device relates to the distance information between the driver D and the seat seat acquired in step S1, for example, and the distance information between the driver D and the seat seat previously stored in a memory or the like. Based on the information, the posture of the driver D is estimated, and the position information of the driver D such as the driver D leaning to the right or left is acquired.

  Note that the calculation method of the position information of the driver D is not limited to these. For example, the position of the seat is the reference position (distance zero), and the posture of the driver D and the position of the head are determined by the distance from the seat. It may be estimated.

  Next, the control device controls the position and content of the image formed on the screen 50 based on the position information of the driver D calculated in step S2 (step S3).

  Specifically, when the control device detects that the position of the face of the driver D is tilted to the right by a predetermined distance, for example, when the vehicle is turned to the right, the control device moves the image formed on the screen 50 to the right. For example, the angle of the folding mirror 40, the angle of the concave mirror 60, and the orientation of the HUD device 1 are controlled.

  In addition, when the control device detects that the position of the hand of the driver D is within a predetermined distance (for example, 20 cm) from the light receiver 90, the content of the image formed on the screen 50 is displayed from the speed display. For example, the video signal is controlled so as to switch to the navigation display.

  When the control device detects that the position of the hand of the driver D is within a predetermined distance (for example, 10 cm) from the light receiver 90, the control device turns off the image formed on the screen 50. For example, the operation of the light source 10 is controlled.

  Further, when the control device detects that the position of the face of the driver D has moved up and down, for example, the angle of the MEMS mirror 30 so that the position of the eye box moves corresponding to the top and bottom of the position of the face, The angle of the concave mirror 60 and the direction of the HUD device 1 are controlled.

  As a method of controlling the angle of the MEMS mirror 30, for example, a method of adjusting the angle of the MEMS mirror 30 by attaching a movable part for adjusting the angle to the MEMS mirror 30 can be mentioned. As a method for controlling the angle of the concave mirror 60, for example, a method of adjusting the angle of the concave mirror 60 by attaching a movable portion for adjusting the angle to the concave mirror 60 can be mentioned. As a method for controlling the orientation of the HUD device 1, for example, a method of adjusting the orientation of the HUD device 1 by attaching a movable part for angle adjustment to the HUD device 1 can be mentioned.

  As described above, the HUD device 1 according to the first embodiment two-dimensionally converts the light source 10, the lens array 20 to which the light emitted from the light source 10 is incident, and the light emitted from the lens array 20. A MEMS mirror 30 that deflects, a folding mirror 40 that guides light deflected by the MEMS mirror 30 to the screen 50, a screen 50 that includes an image forming area B in which an image is formed by the light emitted from the folding mirror 40, and MEMS. And a first reflection mirror 70 that reflects part of the light deflected by the mirror 30. The first reflecting mirror 70 is disposed on the optical path of light other than the light incident on the image forming region B out of the light deflected by the MEMS mirror 30. For this reason, the light source 10 used for forming an image to be projected onto the windshield FG can be used to irradiate the driver D with light without affecting the projected image. As a result, it is possible to emit light for detecting the position of the observer without newly providing a light source.

  Further, the HUD device 1 can detect the position of the observer by detecting the light reflected by the driver D by the light receiver 90 without providing a new light source.

  In addition, although 1st Embodiment demonstrated the form with which the light reflected by the 1st reflective mirror 70 and the 2nd reflective mirror 80 was irradiated to the driver | operator D, without using the 2nd reflective mirror 80, it is 1st. The light reflected by the one reflecting mirror 70 may be directly irradiated to the driver D.

  In the first embodiment, the light receiver 90 is described as being included in the HUD device 1, but the light receiver 90 may be provided outside the HUD device 1. However, from the viewpoint that light other than the light emitted from the light source 10 and applied to the driver D (hereinafter referred to as “external light”) can be prevented from entering the light receiver 90, the HUD device 1. It is preferably inside.

  Moreover, although 1st Embodiment demonstrated the form which is ECU with which the control apparatus was mounted in the vehicle, it is not limited to this, The form by which the control apparatus is integrated in the inside of the HUD apparatus 1 may be sufficient. .

  Further, when it is detected that the position of the eye of the driver D is lower than a preset position, the direction of the reflecting surface of the first reflecting mirror 70 and / or the second reflecting mirror 80 is shifted or blocked. By this method, a mechanism for preventing the driver D from irradiating light may be provided. Thereby, it can suppress that the light reflected by the 1st reflective mirror 70 injects into the driver | operator's D eyes.

[Second Embodiment]
An example of the configuration of the HUD device according to the second embodiment will be described. FIG. 6 is a schematic configuration diagram of the HUD device according to the second embodiment.

  As shown in FIG. 6, the HUD device 1 </ b> A according to the second embodiment is provided with a wavelength conversion element 110 that converts the wavelength of light between the second reflection mirror 80 and the driver D. Different from the HUD device 1 according to the first embodiment. Since other configurations are the same as those of the HUD device 1 according to the first embodiment, differences from the first embodiment will be mainly described.

  As shown in FIG. 6, the HUD device 1A is mounted on a vehicle and is accommodated in a dashboard DB. The HUD device 1A projects an image on the windshield FG of the vehicle, and displays the image so as to overlap the field of view of the driver D of the vehicle. Thereby, the driver D can confirm the information for assisting the driver D such as the vehicle speed, the vehicle state, and the road information while ensuring the field of view on the vehicle front side.

  The HUD device 1 </ b> A includes a light source 10, a lens array 20, a MEMS mirror 30, a folding mirror 40, a screen 50, a concave mirror 60, a first reflection mirror 70, a second reflection mirror 80, and light reception. And a wavelength conversion element 110. The operation of each part of the HUD device 1A is controlled by a control device such as an ECU mounted on the vehicle, for example.

  The wavelength conversion element 110 is provided between the second reflection mirror 80 and the driver D. The wavelength conversion element 110 converts the light reflected by the second reflecting mirror 80 into light other than visible light (for example, infrared light). Thereby, even when external light enters the light receiver 90, the light emitted from the light source 10 and applied to the driver D can be distinguished from the external light. As a result, erroneous detection by the light receiver 90 can be suppressed.

  When the wavelength conversion element 110 is provided, visible light is not transmitted between the wavelength conversion element 110 and the driver D, between the driver D and the light receiver 90, or on the light receiving surface of the light receiver 90, or It is preferable to provide an optical filter such as a band-pass filter that hardly transmits visible light. Accordingly, even when external light enters the optical system of the HUD device 1A, it is possible to suppress external light from entering the light receiver 90. As a result, erroneous detection by the light receiver 90 can be particularly suppressed. Further, the light receiver 90 may be provided with a function capable of detecting only light having a certain luminance or higher. FIG. 6 shows a case where a band pass filter 120 is provided between the wavelength conversion element 110 and the driver D.

  As described above, in the second embodiment, the following effects are obtained in addition to the effects of the first embodiment described above.

  In the second embodiment, the HUD device 1 </ b> A includes a wavelength conversion element 110 provided between the second reflection mirror 80 and the driver D. For this reason, erroneous detection by the light receiver 90 can be suppressed.

  In the second embodiment, the mode in which the wavelength conversion element 110 is provided between the second reflection mirror 80 and the driver D has been described. However, the position where the wavelength conversion element 110 is provided is limited to this. Not. The wavelength conversion element 110 only needs to be provided between the first reflection mirror 70 and the light receiver 90. For example, between the first reflection mirror 70 and the second reflection mirror 80, the driver D and the light reception. It may be provided between the container 90.

[Third Embodiment]
An example of the configuration of the HUD device according to the third embodiment will be described. FIG. 7 is a schematic configuration diagram of the HUD device according to the third embodiment.

  As shown in FIG. 7, the HUD device 1B according to the third embodiment is such that a beam splitter 210 is provided between the second reflecting mirror 80 and the driver D, and thus the HUD according to the first embodiment. Different from device 1. Since other configurations are the same as those of the HUD device 1 according to the first embodiment, differences from the first embodiment will be mainly described.

  As shown in FIG. 7, the HUD device 1B is mounted on a vehicle and accommodated in the dashboard DB. The HUD device 1B projects the image onto the windshield FG of the vehicle, and displays the image so as to overlap the field of view of the driver D of the vehicle. Thereby, the driver D can confirm the information for assisting the driver D such as the vehicle speed, the vehicle state, and the road information while ensuring the field of view on the vehicle front side.

  The HUD device 1B includes a light source 10, a lens array 20, a MEMS mirror 30, a folding mirror 40, a screen 50, a concave mirror 60, a first reflection mirror 70, a second reflection mirror 80, and light reception. Instrument 90 and a beam splitter 210. The operation of each part of the HUD device 1B is controlled by a control device such as an ECU mounted on the vehicle, for example.

  The beam splitter 210 splits the light reflected by the second reflecting mirror 80 into two optical paths (an optical path toward the driver D and an optical path toward the light receiver 90).

  The light receiver 90 receives light separated into two optical paths (light incident after being reflected by the driver D and light directly incident from the beam splitter 210).

  The control device calculates the speed of movement of the driver D by detecting the difference in optical path length using the interference light generated by the light separated into the two optical paths. Then, the control device can control the display position and display content of the image formed on the screen 50 according to the speed of movement of the driver D. Specifically, the control device moves the image formed on the screen 50 in accordance with the movement of the hand based on the operation of removing the hand of the driver D. Further, the control device enlarges / reduces the navigation map formed on the screen 50 based on the movement of the finger of the driver D.

  As described above, in the third embodiment, the following effects are obtained in addition to the effects of the first embodiment described above.

  In the third embodiment, the HUD device 1 </ b> B includes a beam splitter 210 that separates the light reflected by the second reflecting mirror 80 into an optical path toward the driver D and an optical path toward the light receiver 90. For this reason, the image formed on the screen 50 can be controlled in accordance with the movement of the driver D.

[Fourth Embodiment]
An example of the configuration of the HUD device according to the fourth embodiment will be described. FIG. 8 is a schematic configuration diagram of the HUD device according to the fourth embodiment.

  As shown in FIG. 8, the HUD device 1 </ b> C according to the fourth embodiment is a coaxial optical system in which the light source 10 and the light receiver 90 are coaxially arranged, and thus the HUD device according to the first embodiment. Different from 1. Since other configurations are the same as those of the HUD device 1 according to the first embodiment, differences from the first embodiment will be mainly described.

  As shown in FIG. 8, the HUD device 1C is mounted on a vehicle and accommodated in a dashboard DB. The HUD device 1C projects the image onto the windshield FG of the vehicle, and displays the image so as to overlap the field of view of the driver D of the vehicle. Thereby, the driver D can confirm the information for assisting the driver D such as the vehicle speed, the vehicle state, and the road information while ensuring the field of view on the vehicle front side.

  The HUD device 1 </ b> C includes a light source 10, a lens array 20, a MEMS mirror 30, a folding mirror 40, a screen 50, a concave mirror 60, a first reflection mirror 70, a second reflection mirror 80, and light reception. Device 90 and half mirror 310. The operation of each part of the HUD device 1C is controlled by a control device such as an ECU mounted on the vehicle, for example.

  The half mirror 310 is provided between the first reflection mirror 70 and the second reflection mirror 80. The half mirror 310 is reflected by the first reflecting mirror 70, transmits light directed toward the second reflecting mirror 80, and is reflected by the driver D and then reflected by the second reflecting mirror 80. Is a mirror that changes the direction to the light receiver 90.

  The light receiver 90 receives the light reflected by the driver D and then reflected by the second reflecting mirror 80 and the half mirror 310.

  As described above, in the fourth embodiment, the following effects can be obtained in addition to the effects of the first embodiment described above.

  In the fourth embodiment, the HUD device 1 </ b> C is a coaxial optical system in which the light source 10 and the light receiver 90 are arranged so as to be coaxial, so that it is possible to prevent external light from entering the light receiver 90. it can. As a result, the position of the driver D can be detected with high accuracy even in an environment with a lot of outside light.

  In the fourth embodiment, the half mirror 310 is provided between the first reflecting mirror 70 and the second reflecting mirror 80. However, the position where the half mirror 310 is provided is described here. It is not limited. The position where the half mirror 310 is provided is not particularly limited as long as the light source 10 and the light receiver 90 can form a coaxial optical system. For example, between the second reflection mirror 80 and the driver D, Also good.

  The optical scanning device has been described above by way of the embodiment. However, the present invention is not limited to the above embodiment, and various modifications and improvements can be made within the scope of the present invention.

  In the above-described embodiment, the mode in which the light deflected by the MEMS mirror 30 is guided to the screen 50 by the folding mirror 40 has been described, but the present invention is not limited in this respect. For example, the light deflected by the MEMS mirror 30 may be guided directly to the screen 50 without using the folding mirror 40.

DESCRIPTION OF SYMBOLS 1 HUD apparatus 10 Light source 20 Lens array 30 MEMS mirror 40 Folding mirror 50 Screen 60 Concave mirror 70 1st reflective mirror 80 2nd reflective mirror 90 Light receiver 110 Wavelength conversion element 120 Band pass filter 210 Beam splitter 310 Half mirror A Scan Possible area B Image forming area C Non-image forming area

JP 2012-163613 A

Claims (9)

A light source;
An incident optical system into which light emitted from the light source is incident;
An optical deflector for two-dimensionally deflecting light emitted from the incident optical system;
A screen including an image forming region in which an image is formed using light deflected by the light deflector;
A reflective optical system that reflects a portion of the light deflected by the optical deflector, and
The reflection optical system is disposed on an optical path of light other than light incident on the image forming region among light deflected by the light deflector ,
A scanning optical system for guiding the light deflected by the light deflector to the screen;
The reflection optical system is provided on a plane on which the scanning optical system is disposed, and reflects light in a direction different from light incident on the image forming region.
Optical scanning device. The optical deflector is for driving the light emitted from the incident optical system in a sine wave,
The reflection optical system reflects light of a peak portion and / or a valley portion of the sine wave out of light other than light incident on the image forming region,
The optical scanning device according to claim 1 . The reflection optical system includes a light deflection element,
The optical scanning device according to claim 1 or 2. A light receiver for receiving the light reflected by the reflection optical system;
The optical scanning device according to any one of claims 1 to 3. The light source and the light receiver form a coaxial optical system;
The optical scanning device according to claim 4 . A wavelength conversion element that converts light reflected by the reflective optical system into light other than visible light;
The optical scanning device according to any one of claims 1 to 5. An optical filter that transmits light having a wavelength converted by the wavelength conversion element and does not transmit visible light;
The optical scanning device according to claim 6 . A beam splitter for separating the light reflected by the reflection optical system into two optical paths;
The optical scanning device according to any one of claims 1 to 7. A light source;
An incident optical system into which light emitted from the light source is incident;
An optical deflector for two-dimensionally deflecting light emitted from the incident optical system;
A screen including an image forming region in which an image is formed using light deflected by the light deflector;
A reflective optical system that reflects a part of the light deflected by the light deflector and irradiates the part of the light to a target ;
A light receiver for receiving a part of the light reflected by the object;
A control unit that calculates position information of the object based on light detected by the light receiver;
With
The reflection optical system is disposed on an optical path of light other than light incident on the image forming region among light deflected by the light deflector.
Optical scanning device.

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