KR0117810Y1 - Optical distance measurement equipment for preventing car collision - Google Patents

Abstract

The present invention is an optical distance measuring device for use in a vehicle collision preventing device, in particular a vehicle collision prevention device characterized in that to measure the distance by measuring the time that the laser beam is emitted and hit the object by reflecting the laser beam The present invention relates to an optical distance measuring window for a vehicle, and a conventional optical distance measuring device is used for military or industrial purposes and is mounted on a stationary type, so that it is not possible to be mounted on a small vehicle because of its large size and high cost. Minimize the implementation of the optical distance measuring device suitable for the vehicle mounting, and make it possible to install the laser beam light emitting and light receiving device in the vehicle so that the distance can be measured. In addition, the holder is installed to increase the insulation and heat radiation of the laser diode, Mounting can reduce the effects of sunlight and disturbance light, allowing accurate distance measurement.

Description

Optical distance measuring device for vehicle collision prevention device

1 is a front view of the present invention,

2 is a cross-sectional view taken along line A-A 'of the present invention,

3 is an exploded view of FIG.

4 is an unmeasurable area diagram in general laser beam firing,

5 is an unmeasurable area diagram when using a diffraction grating of the present invention,

6 shows (A) the wavelength distribution of the laser diode,

(B) is the wavelength distribution map of sunlight,

(C) is the wavelength distribution of the coating on the protective glass,

7 is a principle diagram of the polarizer used in the present invention.

Explanation of symbols on the main parts of the drawings

10 light emitting part 11 light emitting lens protective glass

12: emitting lens fixing ring 13: emitting lens

14 diffraction grating 15 first barrel for light emission

15-1: 2nd barrel for light emission 15-2: 3rd barrel for light emission

16 laser diode 17 laser driving circuit portion

18 holder 19 rubber ring for light emitting barrel coupling

20: light receiving part 21: glass for protecting the light receiving lens

22: light receiving lens fixing ring 23: light receiving lens

24: polarizer 25: first light receiving barrel

25-1: Second barrel for receiving light 25-2: Third barrel for receiving light

26: photodiode 27: reception signal processing unit

29: rubber ring for light-receiving barrel coupling 30: housing

31: grid 32: holder

33: screw coupling groove 34: bolt

35: second barrel coupling screw for light emission and light reception

36: second barrel screw coupling groove for light emission and light reception

The present invention relates to an optical distance measuring device used in a vehicle collision prevention device, in particular, to prevent the vehicle collision, characterized in that to measure the distance by measuring the time that the laser beam is hit and reflected by emitting a laser beam The present invention relates to an optical distance measuring device for a device.

In general, the conventional optical distance measuring device is used for military or industrial use is a stationary type, there is a problem that can not be mounted on a small vehicle with a large size and expensive price.

The present invention is to solve the above problems, to miniaturize to implement an optical distance measuring device suitable for mounting the vehicle for preventing the collision of the vehicle, and to incorporate a light emitting and receiving device of the laser beam to measure the distance. It features.

That is, a third barrel for emitting light having a light emitting lens fixing ring for fixing a light emitting lens positioned on the front surface, a second barrel for emitting light which holds the third barrel for light emitting and is fitted to allow up and down flow, and laser divergence A first barrel for light emission, which is fixed to a stator in a state in which a laser driving diode fastened to a holder is mounted on a rear surface thereof, and a rubber ring is interposed, and the first barrel for light emission is fixed to a stator in a state of being coupled with the second barrel for light emission. And a light receiving lens protective glass as a set in a straight line, and having a light receiving third barrel having a light receiving lens fixing ring for fixing a light receiving lens positioned at the front, and a third barrel for receiving the light, allowing vertical flow. The second barrel for light receiving and the laser beam transmitting polarizer are housed, and the laser light receiving diode is mounted on the back, and the rubber ring is sandwiched. And it provided with a light receiving period for the second barrel and the combined state in which the first light-receiving barrel fixed to the support unit in the reception signal processing section and a light receiving lens protection glass as a set, with the grating is made between fixed to the housing.

Hereinafter, described in detail with reference to the drawings.

1 is a front view of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A 'of FIG. 1, and includes a laser diode 16 for emitting a laser and a light emitting barrel 15 in which a lens for determining a beam irradiation angle is combined. Configuration of the housing 30 for fixing each of the light-emitting portion 10 consisting of a light receiving portion 25 and the photodiode 26 consisting of a light receiving barrel 25 and a photodiode 26 combined with a light receiving lens for receiving a laser It is shown briefly.

FIG. 3 is an exploded view showing FIG. 2 in detail. The light emitting third barrel 15-2 having the light emitting lens fixing ring 12 for fixing the light emitting lens 13 positioned on the front surface thereof and the third light emitting third The second barrel 15-1 for light emission and the diffraction grating 14 for adjusting the laser divergence angle, which store the barrel 15-2 and are fitted to allow up and down flow, are installed and fastened to the holder 18 on the rear side. The first barrel 15 for light emission, which is mounted on the laser driving diode 16 and fixed to the stator 32 in a state in which it is coupled with the second barrel for light emission 15-1 with the rubber ring 19 therebetween. And a third light receiving barrel 25 having a laser driving circuit portion 17 and a light emitting lens protection glass 11 as a set, and having a light receiving lens fixing ring 22 for fixing the light receiving lens 23 positioned on the front surface thereof. -2), a second light receiving barrel 15-1 for storing the third light receiving barrel 25-2, and fitted to allow up and down flow, and a laser beam transmission The light polarizer 24 is mounted, and the second barrel 15-1 for laser light reception and the laser beam transmission polarizer 24 are mounted on the rear surface, and the laser light receiving photodiode 26 is mounted on the rear surface, and the rubber ring is mounted. The light receiving first barrel 25 and the receiving signal processor 27 and the light receiving lens protective glass 21 which are fixed to the fixing base 32 in a state in which the light receiving second barrel 25-1 is coupled to each other. It is provided as a set and is fixed to the housing 30, respectively, with the grating 31 therebetween.

The present invention configured as described above has a light emitting lens protective glass 11 which serves to protect the apparatus from surrounding contaminants such as mud, rain, snow or fog, etc. on the outermost side, and has a large divergence of a conventional semiconductor laser. The light emitting lens 13 is installed to change the angle to a desired shape, and when the lens 13 is fixed, the lens fixing ring 12 is installed to support the lens 13 so as to prevent the lens from being separated from the device.

The light emitting third barrel 15-2 houses the light emitting lens 13 and the light emitting lens fixing ring 12 described above, and the light emitting second barrel 15-1 is the third light emitting barrel. (15-2) is stored, but the upper and lower flow of the fitting is fixed, if the lens is not in focus move up and down, can be corrected correctly, the second barrel 15-1 for light emission and the rubber ring in between The light emitting first barrel 15 accommodates the diffraction grating 14 on the front side and the laser light emitting diode 16 on the rear side, and is positioned in a single line to adjust and fix the focal length of the laser diode and the lens. Do it.

In this case, when the laser diode 16 is attached to the circuit board, the optical alignment may not occur. Therefore, the rubber positioned between the first barrel 15 for light emission and the second barrel 15-1 for light emission may occur. By adjusting the alignment according to the tightening of the left and right bolts 35 to bind the ring, the left and right movements of the optical axis can be moved in a desired direction, and the laser driving circuit unit 17 for outputting a signal for driving the laser is driven by a laser diode driving circuit. The high-pressure generator can be inserted into a processing device such as a CPU, or it can be detached to a separate device. Where 36 is the second barrel screw coupling groove for light-receiving light.

On the other hand, the diffraction grating 14 located on the rear of the lens 13 is a device for adjusting the laser divergence angle serves to adjust the divergence angle in a different way from the lens 13.

In detail, since the general laser proceeds in a straight line due to the directivity of the light, the laser diverging beam is narrowly shaped to detect the width of the traveling lane of the vehicle at the maximum detection distance. A problem arises in which the parent region appears as an unmeasurable region. Therefore, in the device of the present invention, by generating a plurality of narrow irregularities on the glass surface and installing a diffraction grating 14 which can divide the laser beam into a plurality of pieces using the diffraction phenomenon of the light when the laser beam is transmitted, the laser beam is fixed to a certain number. By dividing, as shown in FIG. 5, the side incontinence area is reduced.

Here, the laser light emitting diode 16 is excellent in heat dissipation function because it typically uses a can type, but if the laser diode 16 is directly fixed by using a barrel, since the conductive object contacts the laser diode, insulation becomes difficult. In the present invention, the holder 18 is used to perform its own heat dissipation function and insulation, as well as to fix the laser diode.

Reference numeral 21 is a glass for protecting the light-receiving portion, and serves to prevent the light-receiving lens 23 from being contaminated. Also, a coating for blocking visible light is applied.

In detail, in general, a laser diode emits light in a constant wavelength region as shown in FIG. 6A, but when sunlight directly enters the photodiode due to the presence of sunlight as shown in FIG. 6B in air. Since an error may occur, coating is performed so that visible light is blocked and only infrared rays are transmitted to show a waveform as shown in FIG.

The light receiving lens fixing ring 22 installed on the rear surface of the light receiving unit protection glass 21 serves to fix the lens like the light emitting lens fixing ring 12, and 23 is a light receiving unit lens that concentrates the received laser beam. It serves to be incident on the diode. (24) is called a polarizer as a polarizer whose role is to reduce disturbance light and transmit the laser beam as it is.

In detail, the laser beam initially emitted by the laser diode emits polarized light as shown in FIG. 7, and when the laser beam hits an object and returns, the returned laser beam is also polarized in the same direction. Therefore, the laser beam passes through as it is, but general sunlight is polarized in all directions, so only components polarized in the same direction as the laser beam pass through the photodiode and the rest are absorbed by the polarizer.

In addition, the size of the diffraction grating 14 and the polarizer 24 is smaller than that of the lens, which does not play a role at the lens end but acts close to the light emitting diodes 16 and 26, and the laser diode 16 or the photo Slightly larger than the surface window of the diode 26 to achieve the same effect, but installed in a small area.

On the other hand, the light receiving third barrel 25-2 houses the light receiving lens 23 and the light receiving lens fixing ring 22 described above, and the light receiving second barrel 25-1 has the light receiving third barrel ( 25-2), but if the lens is not in focus by fastening up and down flow, move up and down to exactly focus the distance, the light receiving second barrel (25-1) and the rubber ring (29) between The first barrel 25 for receiving and combining the light-receiving first barrel 25 houses the polarizer 24 on the front side and the laser light receiving photodiode 26 on the rear side, and is positioned in a straight line so that the photodiode 26 and the light receiving lens 23 are positioned. And the rubber ring 29 positioned at the first barrel 25 for light receiving and the second barrel 25-1 for light receiving is configured to emit the first barrel 15 and the light emitting device. Since it is the same as the role of the rubber ring 19 of the 2nd barrel 15-1, description is abbreviate | omitted. At this time, the laser beam detected by the photodiode 26 is converted into distance data by the reception signal processor 27.

In addition, the light receiving first barrel 25-1 and the light emitting second barrel 15-1 and the rubber rings 29 and 19 interposed therebetween are the first light receiving barrel 25 and the first light emitting barrel. 15 is coupled to the screw coupling groove 33 of the holder 32 by the bolt 34, to prevent the laser beam emitted from the laser diode to be incident on the photodiode diffusely reflected on the glass surface for protecting the light emitting portion. The grating 31 is installed between the light emitting unit 10 and the light receiving unit 20.

As described in detail above, the present invention can be miniaturized to be installed in a vehicle, install a diffraction grating to reduce the unmeasurable area, fasten the insulation and heat dissipation function by fastening the holder to the laser diode, The influence of light and disturbance light can be reduced, and accurate distance measurement is possible.

Claims (9)

A third barrel 15-2 for emitting light and a third barrel 15-2 for emitting light are mounted to store the light emitting lens fixing ring 12 for fixing the light emitting lens 13 positioned on the front surface. The second ring 15-1 for light emission and the diffraction grating 14 for adjusting the laser divergence angle are mounted, and the laser driving diode 16 fastened to the holder 18 is mounted on the rear side of the rubber ring. The first barrel 15 for light emission, the laser driving circuit unit 17 and the light emitting lens protection glass, which are fixed to the fixing base 32 in a state in which the second barrel 15-1 for light emission is engaged with the light emitting device 19 interposed therebetween. A light-receiving portion 10 provided with a set of 11, a light receiving third barrel 25-2 having a light receiving lens fixing ring 22 for fixing a light receiving lens 23 located on the front surface; A light receiving second barrel 15-1 and a second light receiving barrel 15-1 for fastening up and down, and a laser beam transmitting polarizer 24 are mounted on the rear side of the light receiving third barrel 25-2. A light receiving first barrel 25 seated on a laser light receiving photodiode 26 and fixed to the holder 32 in a state in which it is coupled with the light receiving second barrel 25-1 with a rubber ring interposed therebetween; The light receiving unit 20 includes a receiving signal processing unit 27 and a light receiving lens protective glass 21 as a set. The light emitting unit 10 and the light receiving unit 20 have a housing 31 interposed therebetween. 30) Optical distance measuring device for a collision prevention device, characterized in that each is fixed to. The method of claim 1, The diffraction grating 14 is an optical distance measuring device for a collision avoidance device, characterized in that the irregularities are formed on the surface so that the laser beam can be separated into a plurality of laser beam transmission. The method of claim 1, The light receiving lens 23 is an optical distance measuring device for a collision avoidance device, characterized in that to form a coating for blocking visible light. The method of claim 1, Optical distance measuring device for a collision avoidance device, characterized in that between the light emitting portion 10 and the light receiving portion 20 is installed a grating 31 for blocking the light incident portion direct incident light of the laser beam diffused from the light emitting portion (10). The method of claim 1, Optical distance measuring device for a collision avoidance device, characterized in that between the light receiving lens (23) and the photodiode (26) is provided with a laser light separation polarizer (24). The method of claim 1, The diffraction grating 14 and the polarizer 24 is installed in close proximity to the surface window of the laser diode 16 and the photodiode 26, the optical collision measuring apparatus for a vehicle collision prevention device. The method of claim 1, The laser diode 16 is an optical distance measuring device for a collision avoidance device, characterized in that coupled to the holder (18) to increase the performance of insulation and heat dissipation. The method of claim 1, A rubber ring may be arranged between the first and second barrels 15 and 25 and the second and second barrels 15-1 and 15-2 to move the optical axis in a desired direction so that the alignment can be adjusted. 19, 29) optical distance measuring device for a collision prevention device characterized in that the installation. The method of claim 1, The third barrels 15-2 and 25-2 for light-receiving light may be fitted into and attached to the second barrels 15-1 and 25-1 for light-receiving so as to correct the focal distance between the lens and the diode. Optical distance measuring device for vehicle collision prevention device.