| 摘要 |
PURPOSE:To eliminate the need for a back light device and to reduce the size and power consumption of a device by receiving the reflection signal from a target object by using laser light and obtaining the three-dimensional data of the object in accordance with the distance data in a prescribed range. CONSTITUTION:Laser light l1 is modulated by an optical modulator 2 to laser light l2 and is projected through a beam splitter 5, a lambda/4 plate 6, a reflection plate 7, rotry polyhedral mirrors 18a and 18b to a target object. The reflected wave thereof is introduced to the splitter 5, and only the modulated signal component is drawn through a deflecting plate 8, a photomultiplier tube 9 and a filter 10 and is supplied to a mixer 13. Th modulating signal of an oscillator 3 is also supplied to a mixer 12. The outputs from the mixers are applied to a phase detecting circuit 16 then the distance from the target is calculated in an arithmetic circuit 17, by which the respective distances in a scanning range A are determined. The distance data are stored in a memory 23 in synchronization with the rotation of the mirrors 18a, 18b and the data on the ruggedness of the data is formed (image processing) 24 in accordance with the distance data and are stored as the three-dimensional data on the target in an image memory 25. |
