Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V5/00—Refractors for light sources
  • F21V5/04—Refractors for light sources of lens shape
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
  • G01C3/00—Measuring distances in line of sight; Optical rangefinders
  • G01C3/02—Details
  • G01C3/06—Use of electric means to obtain final indication
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
  • G01S17/88—Lidar systems specially adapted for specific applications
  • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
  • G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
  • G01S7/481—Constructional features, e.g. arrangements of optical elements
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
  • G01S7/483—Details of pulse systems
  • G01S7/484—Transmitters
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B3/00—Simple or compound lenses
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B3/00—Simple or compound lenses
  • G02B3/10—Bifocal lenses; Multifocal lenses

Definitions

• the present invention relates to an optical system device.
• the imaging and calculation units can use existing CMOS imagers and CPUs, so the unique part of the system is the light irradiation unit, which consists of a laser and an optical filter.
• the diffusion filter which shapes the beam by passing the laser light through a microlens array and uniformly irradiates the target object over a controlled area, is a distinctive component of the system.
• Patent Document 2 As a method for saving power while still being able to process strong light signals, studies have been conducted on irradiating a dot pattern and performing three-dimensional measurements from the time-of-flight of this light (for example, Patent Document 2).
• conventional dot patterns have lower resolution than uniform illumination using a diffusion filter. To achieve higher resolution, it is necessary to increase the number of dots in the dot pattern, but increasing the dot pattern poses the problem of increased energy consumption. Also, while a high light intensity of the irradiated light is preferable for long-distance measurements, there has been a demand for a low light intensity of the irradiated light for short-distance measurements, thereby reducing energy consumption.
• the distances L1 and L2 are expressed by the following formulas 3 and 4. It is preferable to satisfy the following.
• the shape of the lens 11 can be freely designed according to the pattern of the spread of dots to be irradiated (hereinafter referred to as the dot pattern).
• the dot pattern can be circular
• the shape of the lens 11 can be a spherical lens.
• the shape of the lens 11 can be an appropriately designed aspherical lens.
• the focal length differs depending on the direction. FIG.
• the irradiation unit 2 has a light source 7 that irradiates a plurality of lenses 11 with light of wavelength ⁇ .
• the irradiation unit 2 may be a single light source or a plurality of light sources.
• the light sources 7 are formed so that when the positions of the light sources 7 relative to the lens 11 are superimposed on one lens and aggregated, the aggregated apparent positions of the light sources 7 match each other.
• the light sources included in the same irradiation unit are periodically arranged, and the pitch P x of the light sources in the x direction is a natural number multiple or an inverse of a natural number multiple of the lens pitch P 1 , and the pitch P y in the y direction is a natural number multiple or an inverse of a natural number multiple of the lens pitch P 2 .
• each of the irradiation units 2 may all be formed on the same semiconductor chip. This makes it unnecessary to align the irradiation units or light sources in the x, y, and z directions when assembling the optical system device.
• the optical element 1 is a square array of lenses 11, each of which is a square with a side length of P in a plan view.
• the light sources 7 included in each of the irradiation units 2A to 2D are periodically arranged to be the same as the pitch P of the lenses 11 of the optical element 1, as shown in Figure 3(b).
• the irradiation units 2A, 2B, 2C, and 2D are also arranged so that the periodic positions of the light sources coincide in both the x-axis and y-axis directions.
• the control unit 5 controls the lighting of each of the irradiation units 2.
• the control unit 5 may control the irradiation units 2 in any manner, but for example, it can control the lighting of each of the irradiation units 2 based on distance information calculated by the calculation unit.
• the number of different types of irradiation units that are turned on can be controlled to increase as the distance to the object 9 decreases, and the number of different types of irradiation units that are turned on can be controlled to decrease as the distance to the object 9 increases.
• the number of dots can be increased to increase the resolution, and when the distance to the object is large, the number of dots can be reduced to reduce energy consumption.

Landscapes

• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Electromagnetism (AREA)
• Optics & Photonics (AREA)
• General Engineering & Computer Science (AREA)
• Measurement Of Optical Distance (AREA)
• Microscoopes, Condenser (AREA)

Priority Applications (2)

Applications Claiming Priority (4)

Publications (1)

Family

ID=91717917

Family Applications (1)

Country Status (3)

Citations (4)

• 2023
  • 2023-12-27 JP JP2024567953A patent/JPWO2024143498A1/ja active Pending
  • 2023-12-27 CN CN202380088702.7A patent/CN120418679A/zh active Pending
  • 2023-12-27 WO PCT/JP2023/047053 patent/WO2024143498A1/ja active Application Filing

Patent Citations (4)

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