JP2001021325A - Laser light generating device of three-dimensional image detecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a laser light generating device without exerting adverse influence when laser light enters an eye, in a three-dimensional image detecting apparatus using the laser light. SOLUTION: Six laser light sources a, b, c, a', b', c' are used. Each of the light sources generates radiation power equal to the half necessary for distance measurement, and is arranged annularly at equal intervals. Each of the couples (a, a'), (b, b') and (c, c') faces each other interposing a pickup lens 11, and is used as a light source of one couple which generates a light in this order. At a position where a camera subject is arranged, irradiation regions of two laser lights which are generated from light sources constituting one couple are made to coincide with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser light emitting device for distance measurement used in a three-dimensional image detecting device.

[0002]

2. Description of the Related Art Conventionally, three-dimensional measurement by a three-dimensional image detecting apparatus is classified into an active method in which light, radio waves, or sound is irradiated to an object to be measured, and a passive method in which light or the like is not irradiated. As the active method, a light transit time measurement method, a phase difference measurement method using a modulated light wave, a triangulation method, a moiré method, an interferometry method, and the like are known, and the passive method includes a stereo vision method, a lens focusing method, and the like. Is known.

The active method requires a mechanism for irradiating a laser beam or the like as compared with the passive method, and therefore has a large scale. However, the active method is superior in terms of distance resolution, measurement time, measurement space range, and the like. It has been widely used in application fields. "Measurement Science and Technology"
(S. Christie et al., Vol. 6, p1301-1308, 1995), a laser light that has been pulse-modulated and diffused is applied to the entire object to be measured, and the reflected light is applied to the object to be measured. The light is received by a two-dimensional CCD sensor provided with an image intensifier, and is converted into an electric signal. The image intensifier is shutter-controlled by a gate pulse synchronized with the pulse emission of the laser beam. According to this configuration, the amount of light received by reflected light from a distant object to be measured is smaller than the amount of light received by reflected light from a near object to be measured. Is obtained.

[0004]

However, in the above-described configuration in which three-dimensional measurement is performed by irradiating the diffused laser beam, when a worker is present near an object to be measured, a person is not within the laser beam irradiation area. When the laser beam enters the eyes of the worker when the laser beam is present, the worker may be careful not to look at the laser beam because the irradiated laser beam may damage the retina and the like. Must.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-dimensional image detecting device which performs three-dimensional measurement by irradiating a laser beam, and which does not adversely affect even if the laser beam enters an eye. .

[0006]

According to the present invention, there is provided a laser emitting apparatus in a three-dimensional image detecting apparatus, comprising: a plurality of laser light sources for irradiating a subject with laser light for distance measurement; A light emitting unit, and an irradiation control unit for controlling a laser light source so as to simultaneously irradiate a laser beam for each predetermined group, wherein the laser light sources included in each group are arranged so as not to overlap with each other, and are irradiated from each laser light source. It is characterized in that the respective irradiation areas in the subject of the laser beam to be irradiated have areas overlapping each other.

Each group preferably emits laser light at a different timing. Further, the laser light sources are preferably arranged at equal intervals in an annular shape around the imaging lens or linearly arranged at equal intervals in a predetermined direction, and each laser light source in the group sandwiches the laser light sources of the other groups. Are arranged at equal intervals.

[0008] For example, six laser light sources are arranged in a ring shape at equal intervals, and a pair of laser light sources facing each other with the center of the ring being interposed are grouped. In addition, six laser light sources are linearly arranged at regular intervals in a predetermined direction, and every third laser light source is formed as one group.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a camera-type three-dimensional image detection device according to a first embodiment of the present invention.

On the front of the camera body 10, a finder window 12 is provided at the upper left of the taking lens 11, and a flash 13 is provided at the upper right. An annular laser light emitting device 22 is arranged on the outer peripheral edge of the imaging lens 11. Six light sources (laser light sources) on the front of the light emitting device 22
14 are arranged at equal intervals along the ring. Camera body 1
A release switch 15 and a liquid crystal display panel 16 are provided on the upper left surface of the “0”, and a mode switching dial 17 and a V / D mode switching switch 18 are provided on the upper right surface. A card insertion slot 19 for inserting an IC memory card is formed on a side surface of the camera body 10, and a video output terminal 20 and an interface connector 21 are provided.

FIG. 2 is a block diagram showing a circuit configuration of the camera type three-dimensional image detecting device shown in FIG. An aperture 25 is provided in the taking lens 11. The opening of the aperture 25 is adjusted by an iris drive circuit 26. The focus adjustment operation and the zooming operation of the taking lens 11 are controlled by a lens drive circuit 27.

On the optical axis of the taking lens 11, an image pickup device (C
CD) 28 is provided. A subject image is formed on the CCD 28 by the photographing lens 11, and charges corresponding to the subject image are generated. Operations such as a charge accumulation operation and a charge read operation in the CCD 28 are controlled by the CCD drive circuit 30. The charge signal, that is, the image signal, read from the CCD 28 is amplified by the amplifier 31 and the A / A
The analog signal is converted into a digital signal in the D converter 32. The digital image signal is output from the imaging signal processing circuit 3
In the image memory 3, processing such as gamma correction is performed.
4 is temporarily stored. The iris drive circuit 26, lens drive circuit 27, CCD drive circuit 30, and image signal processing circuit 33 are controlled by a system control circuit 35.

The image signal is read from the image memory 34 and supplied to the LCD drive circuit 36. The LCD drive circuit 36 operates in accordance with the image signal, and thereby the image display L
An image corresponding to the image signal is displayed on the CD panel 37.

The image signal read from the image memory 34 is sent to a TV signal encoder 38 and can be transmitted via a video output terminal 20 to a monitor device 39 provided outside the camera body 10. The system control circuit 35 is connected to the interface circuit 40, and the interface circuit 40 is connected to the interface connector 21.
It is connected to the. Therefore, the image signal read from the image memory 34 can be transmitted to the computer 41 connected to the interface connector 21. The system control circuit 35 includes a recording medium control circuit 42
Is connected to the image recording device 43 via the. Therefore, the image signal read from the image memory 34 can be recorded on a recording medium M such as an IC memory card mounted on the image recording device 43.

A light emitting element control circuit 44 is connected to the system control circuit 35. The light source 14 arranged in an annular shape on the front surface of the light emitting device 22 includes a laser diode (LD) 14a and an illumination lens 14b.
The light emitting operation of the light emitting element 14a is controlled by the light emitting element control circuit 44. The light emitting element 14a irradiates a laser beam as a distance measuring beam, and this laser beam is
The light is radiated to the entire subject via the reference numeral 4b. The light reflected by the subject enters the taking lens 11, and this light is
By detecting with D28, the distance to the subject is measured as described later. In this measurement, C
Control of the transfer operation timing and the like in the CD 28 is performed by the system control circuit 35 and the CCD drive circuit 30.

The system control circuit 35 is connected to a switch group 45 including a release switch 15, a mode switching dial 17, and a V / D mode switching switch 18, and a liquid crystal display panel 16.

Next, the principle of the distance measurement in the present embodiment will be described with reference to FIGS. In FIG. 4, the horizontal axis is time t.

The distance measuring light output from the distance measuring device B is reflected by the subject S and received by a CCD (not shown). The distance measuring light is a pulsed light having a predetermined pulse width H, and therefore, the reflected light from the subject S is also a pulsed light having the same pulse width H. The rise of the reflected light pulse is delayed by a time δ · t (δ is a delay coefficient) from the rise of the distance measuring light pulse. Since the distance measuring light and the reflected light have traveled twice the distance r between the distance measuring device T and the subject S, the distance r is given by r = δ · t · C / 2 (1) can get. Where C is the speed of light.

For example, a state in which reflected light can be detected from the rise of the pulse of the distance measuring light is determined, and the state is changed to an undetectable state before the reflected light pulse falls, that is, a reflected light detection period T is provided. And the received light amount A during the reflected light detection period T is a function of the distance r. That is, the light receiving amount A decreases as the distance r increases (the time δ · t increases).

In this embodiment, utilizing the above-described principle,
The distance from the camera body 10 to each point on the surface of the subject S is detected by detecting the amount of received light A at each of a plurality of photodiodes (photoelectric conversion elements) provided in the CCD 28 and arranged two-dimensionally. , Subject S
The data of the three-dimensional image relating to the surface shape is input collectively.

FIG. 5 is a diagram showing the arrangement of the photodiode 51 and the vertical transfer unit 52 provided on the CCD 28.
FIG. 6 is a cross-sectional view of the CCD 28 cut along a plane perpendicular to the substrate 53. This CCD 28 is a conventionally known interline type CCD, and uses a VOD for sweeping out unnecessary charges.
(Vertical overflow drain) method.

The photodiode 51 and the vertical transfer section (signal charge holding section) 52 are formed along the surface of an n-type substrate 53. The photodiodes 51 are two-dimensionally arranged in a lattice, and the vertical transfer units 52 are provided adjacent to the photodiodes 51 arranged in a line in a predetermined direction (vertical direction in FIG. 5). The vertical transfer unit 52 includes four vertical transfer electrodes 52 a and 52 for one photodiode 51.
b, 52c and 52d. Therefore, in the vertical transfer section 52, four potential wells can be formed, and signal charges can be output from the CCD 28 by controlling the depths of these wells as conventionally known. The number of vertical transfer electrodes can be freely changed according to the purpose.

A photodiode 51 is formed in a p-type well formed on the surface of the substrate 53, and the p-type well is completely depleted by a reverse bias voltage applied between the p-type well and the n-type substrate 53. You. In this state, charges corresponding to the amount of incident light (reflected light from the subject) are accumulated in the photodiode 51. When the substrate voltage Vsub is increased to a predetermined value or more, the electric charge accumulated in the photodiode 51 is discharged to the substrate 53 side. On the other hand, when a charge transfer signal (voltage signal) is applied to the transfer gate unit 54, the charges accumulated in the photodiode 51 are transferred to the vertical transfer unit 52. That is, after the charges are discharged to the substrate 53 side by the charge discharge signal, the signal charges accumulated in the photodiode 51 are transferred to the vertical transfer unit 52 side by the charge transfer signal. By repeating such an operation, the signal charges are integrated in the vertical transfer unit 52,
A so-called electronic shutter operation is realized.

FIG. 7 is a timing chart of a distance information detecting operation for detecting data relating to the distance to each point on the surface of the subject. The operation of detecting distance information will be described with reference to FIGS. Note that, in the distance detection operation of the present embodiment, in order to reduce noise due to the influence of external light, unlike the description of the distance measurement principle performed with reference to FIG.
The timing chart is configured so that the reflected light can be detected from the fall of the ranging light pulse and the state can be switched to the undetectable state after the fall of the reflected light pulse. Not different.

A charge discharge signal (pulse signal) S1 is output in synchronization with the output of the vertical synchronization signal (not shown), whereby unnecessary charges accumulated in the photodiode 51 are discharged in the direction of the substrate 53. Then, the accumulated charge amount in the photodiode 51 becomes zero (reference S2). After the start of output of the charge sweeping signal S1, pulse-shaped ranging light S3 having a constant pulse width is output. The period (pulse width) during which the ranging light S3 is output can be adjusted.
The adjustment is performed so that the distance measurement light S3 is turned off simultaneously with the output of the charge sweeping signal S1.

The distance measuring light S3 is reflected by the object, and
It is incident on D28. That is, although the reflected light S4 from the subject is received by the CCD 28, the charge sweeping signal S1
Is not stored in the photodiode 51 (reference S2). Charge sweep signal S1
Is stopped, the photodiode 51 starts to accumulate charges by receiving the reflected light S4, and the reflected light S4
4 and signal charges S5 caused by external light are generated. Reflected light S
When 4 disappears (reference S6), the photodiode 51 ends the charge accumulation based on the reflected light (reference S7).
Charge accumulation due to only external light continues (reference S8).

Thereafter, when the charge transfer signal S9 is output, the charges accumulated in the photodiode 51 are transferred to the vertical transfer section 52. This charge transfer is completed when the output of the charge transfer signal ends (reference S10). In other words, the charge accumulation in the photodiode 51 continues due to the presence of external light, but the signal charge S1 accumulated in the photodiode 51 until the output of the charge transfer signal ends.
1 is transferred to the vertical transfer unit 52. The charge S14 accumulated after the output of the charge transfer signal ends remains in the photodiode 51 as it is.

As described above, the period T from the end of the output of the charge sweeping signal S1 to the end of the output of the charge transfer signal S9.
_{During U1} (charge accumulation period), the photodiode 51
Signal charges corresponding to the distance to the subject are accumulated. The charges accumulated in the photodiode 51 until the end of the reception of the reflected light S4 (reference S6) are converted into signal charges S12 corresponding to the external light and the distance information of the subject by the vertical transfer unit 5
2 and the other signal charges S13 are caused only by external light.

After a predetermined time has elapsed from the output of the charge transfer signal S9, the charge sweeping signal S1 is output again, and after the transfer of the signal charge to the vertical transfer unit 52, the photodiode 51
Unnecessary charges accumulated in the substrate 53 are swept toward the substrate 53.
That is, accumulation of signal charges in the photodiode 51 is newly started. Then, as described above, when the charge accumulation period T _U1 has elapsed, the signal charge is transferred to the vertical transfer unit 52.

The vertical transfer section 5 of such signal charges S11
2 is repeatedly executed until the next vertical synchronization signal is output. Thus, the signal charges S11 are integrated in the vertical transfer unit 52. In the signal charge S11 integrated during the period of one field (the period between two vertical synchronization signals), if the subject is considered to be stationary during that period, the signal charge S12 corresponding to the distance information to the subject is included. And signal charges S13 accumulated by external light
It is included. Here, the charge amount of the signal charge S13 is smaller than the charge amount of the signal charge S12, so that the distance information can be obtained from the signal charge S11. That is, the light receiving time T _{D of} the distance measuring light reflected on the surface of the measurement object
If the relationship between the signal charge S11 and the signal charge S11 is determined, the light receiving time T _D corresponds to δ · t in the equation (1), so that the signal charge S1
The distance r can be obtained from 1.

The detection operation of the signal charge S11 described above relates to one photodiode 51, and such detection operation is performed in all the photodiodes 51 having the vertical transfer electrode 52a. As a result of the detection operation in the period of one field, the vertical transfer unit adjacent to the photodiode 51 having the vertical transfer electrode 52a holds the distance information detected by the photodiode 51. This distance information is output to the outside of the CCD 28 by a vertical transfer operation in the vertical transfer unit 52 and a horizontal transfer operation in a horizontal transfer unit (not shown).

Next, the light emission timings of the six light sources 14 will be described with reference to FIGS.

FIG. 8 is a schematic diagram when the annular light emitting device 22 is viewed from the front. 6 arranged at equal intervals in a ring
When the reference numerals a, b, c, a ', b', and c 'are assigned to the light sources 14 clockwise from the light sources arranged at 12 o'clock,
a and a ', b and b', c and c 'are arranged at positions facing each other with the center of the ring interposed therebetween, and each constitute one group. FIG. 9 is a timing chart showing the accumulation period of signal charges and the emission timing of pulsed ranging light emitted from six light sources.

First, pulsed ranging light S from the light sources a and a '
The first accumulation period starts almost at the same time when the distance measuring lights Sa and Sa 'fall down, simultaneously irradiating a. After the distance measuring lights Sa and Sa 'have fallen, the pulsed distance measuring lights Sb and Sb' are simultaneously emitted from the light sources b and b ', and the second distance measuring lights Sb and Sb' fall almost simultaneously. The accumulation period starts. Similarly, after the ranging lights Sb and Sb 'fall, pulsed ranging lights Sc and S from the light sources c and c'.
The third accumulation period starts almost at the same time when the distance measuring lights Sc and Sc 'fall at the same time as the irradiation of c'.

Similarly, during one field period, pulsed ranging light is repeatedly output from three sets of light sources a and a ', b and b', and c and c ', and each time a signal charge including distance information is output. Is accumulated. In addition, the use of a set of a and a ', a set of b and b', and a set of c and c 'as three light sources is as follows.
This is because, when two light sources emit light simultaneously, the two light emission centers are separated as much as possible.

FIG. 10 shows an irradiation area of distance measuring light emitted from the light sources a and a 'when the light sources a and a' emit light at the same time. The two ranging lights emitted from the light sources a and a 'are emitted to substantially the same area U at a distance where the subject is located. That is, the points P and P ′, which are the centers of the irradiation areas of the two distance measurement lights, substantially coincide with each other in the area U. Also, the irradiance from each light source is substantially uniform over the entire irradiation area U, and even if the radiation power of laser light emitted from one light source is reduced to half the radiation power required for distance measurement,
In the irradiation area U where the two ranging lights overlap, the radiation power required for ranging is obtained. Although the figure illustrates the state when the light sources a and a ′ are irradiated, the light sources b and b ′,
The same applies to the case where c and c ′ are irradiated.

FIG. 11 schematically shows a state in which the distance measuring light emitted from the light sources a and a 'has entered the human eye.

In the present embodiment, the distance measuring light has a wavelength of 40.
It is a laser beam of 0 to 1400 nm, more preferably a near-infrared laser beam. At this time, the laser light reaches the retina R almost without being absorbed by the cornea C or the lens L of the eye. The maximum allowable exposure of the eye to laser radiation (MP
E) is the value at the retina R. The ranging light emitted from the light sources a and a ′ is diffused and emitted so as to illuminate the entire subject, but since the human eye focuses unconsciously, 1
The ranging light emitted from the two light sources is condensed at one point on the retina R, and is in a beam observation state. That is, the ranging light emitted from the light source a passes through the cornea C and the lens L, and is condensed on the point Q on the retina R of the eyeball E. The ranging light emitted from the light source a ′ undergoes the same process. The light is condensed on a point Q ′ on the retina R through the light source.

The distance measuring light emitted from the light sources a and a 'is condensed on the retina R at different points Q and Q'.
Since the radiation power of the laser beam emitted from one light source is reduced to half of the radiation power required for distance measurement, the radiance of the light condensed at each of the points Q and Q 'is also reduced by one light source. Approximately half of the distance measurement using Therefore, by simultaneously irradiating the same area with the distance measuring light of half the radiation power required for the distance measurement from each of the two light sources a and a ', the light amount required for the distance measurement is secured and one light source is supported. The radiance at the converging point (Q or Q ') can be reduced to about half. The distance between the point Q and the point Q ′ increases as the distance between the light emission centers of the light sources a and a ′ increases.

In this embodiment, the light sources are divided into three sets a and a ', b and b', and c and c ', and the light sources in each set emit light sequentially as shown in FIG. That is, the focal point of the laser light emitted from each set of light sources on the retina R sequentially moves, and the time during which the laser light is focused on one point on the retina R is shortened. Therefore, since the integrated radiance received by one light-converging point on the retina R is reduced, a sufficient amount of light for distance measurement can be obtained while satisfying the MPE at the retina R.

FIG. 12 shows the relationship between the reflected light received by the photodiode 51 and the storage time when each light source emits light at the timing shown in FIG. 9, and the horizontal axis represents time. ing. The hatched portion in the figure is a portion of the received pulsed reflected light that is accumulated as signal charges in the photodiode 51. Since the radiation power of the laser light emitted from each light source is about half of the radiation power required for distance measurement, the signal charge accumulated in the photodiode 51 by the reflected light corresponding to each light source is also about half. I have. However, the signal charge corresponding to the distance information accumulated in one accumulation period is due to the distance measurement light emitted from the two light sources a and a 'as shown by, for example, the hatched portions S20 and S21, and therefore, the signal charge is generally used for the distance measurement. Necessary signal charges can be stored.

As described above, according to the present embodiment, in the three-dimensional image detection apparatus, while obtaining a sufficient amount of light necessary for distance measurement, the integrated radiance at the focal point on the retina by each light source is reduced. It is possible to improve the safety for human eyes while in the laser irradiation area.

Next, a second embodiment will be described with reference to FIGS. FIG. 13 is a perspective view of a camera-type three-dimensional image detection device according to the second embodiment. The difference between the second embodiment and the first embodiment is that the light emitting device 2
2 and the arrangement of the light source 14 provided in the light emitting device 22. Others are exactly the same as in the first embodiment.

In the second embodiment, the light emitting device 22 is linearly provided on the upper surface of the camera body 10 along a ridge line whose upper surface is the front surface, and six light sources 14 are provided on the front surface of the light emitting device 22. Are arranged in a line at equal intervals. As shown in FIG. 14, a,
Symbols b, c, a ', b', and c 'are given, and light sources a and a', b and b ', and c and c' are one set (group) of light sources as in the first embodiment. Treat as That is, each set of light sources is disposed with two light sources interposed therebetween. When the light emission of each light source is controlled for each set as in the first embodiment, the same effect as in the first embodiment can be obtained.

The laser beam irradiated in this embodiment is:
The irradiance of the laser beam varies depending on the distance from the light source because the light is diffused so as to irradiate the entire subject, but the radiant power of the light source is adjusted according to the distance so that the irradiance on the subject surface is constant. Can be adjusted.

In this embodiment, the number of light sources provided in the light emitting device is six, but more light sources may be provided at least. In this embodiment, a pair of light sources is synchronized to emit light. However, for example, the light sources a, c, and b 'are set as one set of light sources, and the other light source is set as b, a', and c '. Is also good.

In the present embodiment, the light sources included in one set (group) are arranged at a fixed distance with respect to the other group of light sources, but without interposing the other group of light sources. It may be arranged. At this time, the light sources in the group may be adjacent to each other (the distance between the light sources is 0).

[0048]

As described above, according to the present invention, in a three-dimensional image detecting apparatus which performs three-dimensional measurement by irradiating laser light, a laser light emitting apparatus which does not adversely affect even if laser light enters eyes. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera-type three-dimensional image detection device according to a first embodiment.

FIG. 2 is a block diagram showing a circuit configuration of the camera-type three-dimensional image detection device shown in FIG.

FIG. 3 is a diagram for explaining the principle of distance measurement using ranging light.

FIG. 4 Distance measuring light, reflected light, gate pulse, and CCD
FIG. 4 is a diagram showing a distribution of the amount of light received by the light source.

FIG. 5 is a diagram showing an arrangement of a photodiode and a vertical transfer unit provided in a CCD.

FIG. 6 is a cross-sectional view of the CCD cut along a plane perpendicular to the substrate.

FIG. 7 is a timing chart of a distance information detecting operation for detecting data relating to a distance to a subject.

FIG. 8 is a schematic diagram when the light emitting device according to the first embodiment is viewed from the front.

FIG. 9 is a diagram illustrating light emission timing of a light source provided in a light emitting device.

FIG. 10 is a schematic diagram illustrating a region irradiated when one set of light sources emits light according to the first embodiment, and a position of a central peak thereof.

FIG. 11 is a diagram schematically illustrating a state when distance measuring light is incident on an eye.

FIG. 12 is a diagram illustrating a relationship between a light receiving pulse of reflected light corresponding to each light source and an accumulation period.

FIG. 13 is a perspective view of a camera-type three-dimensional image detection device according to a second embodiment.

FIG. 14 is a schematic diagram when the light emitting device according to the second embodiment is viewed from the front.

[Explanation of symbols]

 10 Camera body 14 Light source 22 Light emitting device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Nobuhiro Tani 2-36-9 Maenocho, Itabashi-ku, Tokyo Asahi Gaku Kogyo Co., Ltd. F-term (reference) 2F065 AA02 AA04 AA06 AA53 BB29 DD00 FF04 FF11 FF32 GG06 GG13 GG17 HH13 JJ03 JJ05 JJ18 JJ26 LL04 LL30 QQ03 QQ21 QQ24 QQ32

Claims (7)

[Claims] 1. A laser emitting means comprising a predetermined group of a plurality of laser light sources for irradiating a subject with laser light for distance measurement, and said laser so as to irradiate laser light simultaneously for each group. Irradiation control means for controlling a light source, wherein each of the laser light sources included in each of the groups is arranged at a predetermined distance, and each of the irradiation areas of the subject of the laser light emitted from each of the laser light sources is mutually A laser light emitting device for a three-dimensional image detecting device, comprising an overlapping area. 2. The laser light emitting device according to claim 1, wherein each of the groups emits a laser beam at a different timing. 3. The laser light source according to claim 2, wherein the laser light sources are annularly arranged at equal intervals around the imaging lens.
The laser light emitting device of the three-dimensional image detection device according to claim 1. 4. The laser light emitting device according to claim 2, wherein the laser light sources are linearly arranged at regular intervals in a predetermined direction. 5. The laser according to claim 3, wherein each of the laser light sources in the group is disposed so as to sandwich the laser light sources in another group. Light emitting device. 6. The laser light source according to claim 1, wherein the six laser light sources are arranged in a ring shape at equal intervals, and a pair of the laser light sources facing each other across the center of the ring is formed as one group. Item 6. A laser emitting device of the three-dimensional image detecting device according to Item 5. 7. The method according to claim 5, wherein the six laser light sources are linearly arranged at regular intervals in a predetermined direction, and every third laser light source is grouped as one group. Laser light emitting device of three-dimensional image detection device.