Title:
【発明の名称】車間距離検出装置
Document Type and Number:
Japanese Patent JP2976679
Kind Code:
B2
Abstract:
PURPOSE:To prevent the reflection of a laser light at a windshield in a vehicle distance detecting apparatus which measures the distance to a vehicle running ahead by means of the laser light from a laser radar device set at a predetermined position within a vehicle. CONSTITUTION:An Al2O3 film 20 of lambda/4 thickness, a ZrO2 film 22 of lambda/2 thickness and an MgF2 film 24 of lambda/4 thickness are sequentially deposited as a non- reflecting coating film on a windshield 11. In consequence, the reflectivity of the laser light of wavelength is decreased to approximately 0%, so that the noises due to the light reflected at the windshield 11 and reflected at an instrument panel within the vehicle are reduced. The measuring accuracy of the distance is improved owing to the improvement of the power of the emitted laser light.
More Like This:
| JPH0693521 | [Title of Invention] Reflective photoelectric sensor |
| JP3132178 | REFLECTION MEASURING DEVICE FOR CAR |
| JPH02190999 | ALARM EVALUATING TOOL |
Inventors:
MYAKOSHI HIROCHIKA
Application Number:
JP5318292A
Publication Date:
November 10, 1999
Filing Date:
March 12, 1992
Export Citation:
Assignee:
TOYOTA JIDOSHA KK
International Classes:
G01S17/02; G01S17/88; G01S17/93; (IPC1-7): G01S17/93
Domestic Patent References:
| JP63228101A | ||||
| JP63261646A | ||||
| JP61121037A | ||||
| JP61133901A | ||||
| JP5659201A | ||||
| JP5924278A | ||||
| JP6253050B2 |
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)