Image projection apparatus

Patent metadata

Field	Value
Publication number	US-10118537-B2
Application number	US-201615565231-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Apr 10, 2015
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

An image projection apparatus that can be attached to a vehicle and can be effectively utilized for acquisition of road surface condition information, detection of a hidden vehicle, and the like is provided. The image projection apparatus that projects an image includes: an acquisition unit that acquires information related to a vehicle; an image projection unit that projects an image based on the information acquired by the acquisition unit; and imaging means that acquires an image outside the vehicle, the image projection unit projects light in a wavelength band centered on a wavelength of 1.4 μm, and the imaging means provides the information related to the vehicle by imaging an image projected based on the light in the wavelength band centered on the wavelength of 1.4 μm.

First claim

The invention claimed is:

1. An image projection system for projecting an image on a road surface from a vehicle,
comprising:
a controller configured to connect at least one of a sensor or communication circuitry and to input a signal including information related to the vehicle from the at least one of the sensor or the communication circuitry;
an image projection apparatus that comprises:
a light source configured to irradiate light;
a light modulator configured to modulate the light from the light source based on the information related to the vehicle input by the controller and generate an information image; and
a projection optical system configured to project the information image generated by the light modulator on a road surface; and

a camera configured to image an outside of the vehicle,
wherein the light source is further configured to irradiate light including predetermined wavelength light for sensing, the light modulator is further configured to modulate the light including predetermined wavelength light for sensing and generate a sensing image, and projection optical system is further configured to project the sensing image generated by the light modulator on the road surface,
wherein the camera is further configured to image the sensing image on the road surface which is projected by the image projection apparatus, and
wherein the controller is further configured to:
calculate or detect a road surface condition or a presence of another vehicle from the sensing image on the road surface which is imaged by the camera; and
control the image projection apparatus to change the information image based on the detected road surface condition or the presence of another vehicle.

2. The image projection apparatus according to claim 1 ,
wherein the predetermined wavelength light for sensing is light of a wavelength of 1.4 μm.

3. The image projection system according to claim 1 ,
wherein the light modulator is a transmissive liquid crystal panel, reflective liquid crystal panel, or a digital micromirror device.

4. The image projection system according to claim 1 ,
wherein the light source is a high pressure mercury lamp, a xenon lamp, a LED light source, or a laser light source.

5. The image projection system according to claim 1 ,
wherein the controller is further configured to control the information image to compensate for the road surface condition.

Assignees

• Maxell Ltd

Inventors

• Kunii Yasuhiko
• Sugiyama Toshinori
• Shimizu Takuya

Classifications

• G01S17/04

  Systems determining the presence of a target · CPC title

• G08G1/167

  Driving aids for lane monitoring, lane changing, e.g. blind spot detection · CPC title

• H04N9/3194

  including sensor feedback · CPC title

• H04N9/3188

  Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391) · CPC title

• B60Q2300/122

  Steering angle · CPC title