Vehicle night vision system

• US 20060186347A1
• Filed: 09/16/2005
• Published: 08/24/2006
• Est. Priority Date: 09/17/2004
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Ohkawara, Osamu, Ohkawara, Nobuko, Ishida, Yoshimitsu
• Granted Patent: US 7,304,568 B2
• Time in Patent Office: Days
• US Class Current: 250/472.100
• CPC Class Codes: B60Q 1/143 combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
• CPC Class Codes: B60Q 2300/21 Manual control
• CPC Class Codes: B60Q 2300/314 Ambient light
• CPC Class Codes: B60Q 2300/337 Tunnels or bridges
• CPC Class Codes: B60R 1/00 Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
• CPC Class Codes: B60R 1/24 in front of the vehicle
• CPC Class Codes: B60R 1/30 providing vision in the non-visible spectrum, e.g. night or infrared vision
• CPC Class Codes: B60R 1/31 providing stereoscopic vision
• CPC Class Codes: B60R 2300/105 using multiple cameras
• CPC Class Codes: B60R 2300/106 using night vision cameras
• CPC Class Codes: B60R 2300/107 using stereoscopic cameras
• CPC Class Codes: B60R 2300/205 using a head-up display
• CPC Class Codes: B60R 2300/30 characterised by the type of image processing
• CPC Class Codes: B60R 2300/404 triggering from stand-by mode to operation mode
• CPC Class Codes: B60R 2300/8053 for bad weather conditions or night vision

Abstract

In a vehicle night vision system, the display unit is activated only when an illumination level below the prescribed level has persisted for more than the prescribed period of time so that the display unit would not be activated when the low illumination level lasts only for a short period of time and the night vision system would not be required. Therefore, when the vehicle passes through a short tunnel during daytime, the display unit would not be activated and the vehicle operator is prevented from being unnecessarily distracted. On the other hand, when the vehicle passes through a long tunnel or when the sun has set and the illumination level of the road ahead is low, the night vision system is activated without fail, and assists the vehicle operator'"'"'s vision.

Claims

1. A vehicle night vision system, comprising;

an infrared camera mounted on a part of a vehicle body;

an onboard display unit for displaying at least an image captured by the infrared camera;

an illumination sensor adapted to detect an illumination level exterior of the vehicle body; and

a control unit for displaying an image captured by the infrared camera on the display unit and controlling the display unit according to an output signal from the illumination sensor;

wherein the control unit activates the display unit when an illumination level detected by the illumination sensor has persisted to be below a prescribed level for a prescribed period of time.

2. The vehicle night vision system according to claim 1, further comprising an operating mode selection switch that includes a position for an synchronizing mode for associating an operation of the display unit with the output signal from the illumination sensor and a position for a manual mode for manually determining an operation of the display unit.

3. The vehicle night vision system according to claim 1, further comprising a manual command switch for manually terminating an operation of the display unit without regard to the operating mode selected by the operating mode selection switch.

4. The vehicle night vision system according to claim 1, further comprising a manual command switch for selectively activating and deactivating the display unit when the synchronizing mode is selected by the operating mode selection switch.

5. The vehicle night vision system according to claim 1, wherein the display unit is adapted to be deployed in an operating state and retracted in a non-operating state.

6. The vehicle night vision system according to claim 1, wherein the display unit comprises a head up display unit.