JP2015225992A - Laser device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser device capable of achieving a long service life with a simple configuration.SOLUTION: The laser device includes: a plurality of laser light source units 31; a holding member 32 for holding the plurality of laser light source units 31; a driving unit for driving the holding member 32; a drive control unit 39 for controlling the driving unit so as to move an arbitrary one of the plurality of laser light source units 31 to a predetermined position; and a light source control unit 45 for making the laser light source unit 31 moved to the predetermined position emit light.

Description

  The present invention relates to a laser apparatus.

  Conventionally, a laser apparatus provided with a laser light source is known.

  For example, Patent Literature 1 discloses a lighting device including a first light source unit, a second light source unit, and a light source control unit that controls the first light source unit and the second light source unit. The illumination device further includes a common light guide unit that guides illumination light emitted from the first light source unit and the second light source unit to a common emission end surface, and is included in the optical path of the light guide unit. An opening is provided so as to intersect.

  And the optical path change wheel which can arrange | position a light reflection area | region and a light transmission area | region alternately can be provided in the said opening part, The said light source control part is the said light reflection area | region and said light transmission area | region arrange | positioned in the said opening part. Based on the occupied state, the first light source unit or the second light source unit in which the optical path to the emission end face is secured is turned on.

JP 2008-40414 A

  According to the illumination device disclosed in Patent Document 1, since the first light source unit and the second light source unit are used while being switched, it is possible to extend the lifetime of the illumination device. However, there is a problem that a light guide section and an optical path changing wheel having a complicated structure are necessary.

  Therefore, an object of the present invention is to provide a laser device that can achieve a long life with a simple configuration.

In order to achieve the above object, the laser device of the present invention comprises:
A plurality of laser light source units;
A holding member for holding the plurality of laser light source units;
A drive unit for driving the holding member;
A drive control unit that controls the drive unit to move an arbitrary laser light source unit of the plurality of laser light source units to a predetermined position;
A light source control unit that emits light from the laser light source unit moved to the predetermined position;
It is set as the structure provided with.

  According to such a configuration, it is possible to extend the life of the laser device by emitting light while switching a plurality of laser light source units with a simple configuration.

Further, in the above-mentioned configuration, an opening limiting unit that further allows the laser beam emitted from the laser light source unit moved to the predetermined position to pass through by limiting the opening,
The longitudinal direction of the beam shape of the emitted laser light may be the driving direction of the holding member.

  According to such a configuration, when the holding member is driven and the laser light source unit is arranged at the predetermined position, even when a deviation occurs in the stationary position, the laser beam after the limitation by the aperture limiting unit is generated. It can suppress that light quantity falls.

  In any one of the configurations described above, the drive control unit controls the drive unit to move the laser light source unit that is not adjacent to the laser light source unit disposed at the predetermined position to the predetermined position. It is good as well.

  According to such a structure, it can suppress receiving the influence of the heat | fever by the laser light source part which light-emitted previously in the predetermined position.

  In the above configuration, the number of the plurality of laser light source units may be five or more, and the driving unit may rotationally drive the holding member.

  According to such a configuration, by switching the holding member in one direction, switching to laser light source units that are not adjacent to each other can be performed continuously, and all laser light source units can be covered.

  In the above configuration, the number of the plurality of laser light source units may be an odd number.

  According to such a configuration, it is possible to continuously switch to laser light source units that are not adjacent to each other and to cover all the laser light source units by rotationally driving the holding member by the same angle in one direction.

Further, in any one of the above configurations, the light source control unit supplies a driving current to the laser diode so as to make the light emission power of the laser diode included in the laser light source unit constant,
The drive control unit may switch the laser light source unit disposed at the predetermined position to another laser light source unit when a parameter related to the temperature of the laser diode reaches a predetermined value.

  According to such a configuration, it is possible to extend the life of each laser diode included in each of the plurality of laser light source units.

Further, in any one of the above configurations, the laser light source unit includes a laser diode and a relay substrate for supplying a driving current to the laser diode,
The relay board may include a terminal portion that contacts a terminal connected to the light source control unit when the laser light source unit is moved to the predetermined position.

  According to such a configuration, only one light source control unit is required to drive the plurality of laser light source units.

  In any of the above-described configurations, the image light emitting unit that emits the image light, the image forming unit that forms the image light by the image light emitting unit as an optical image in space, and the image light emitting unit moved to the predetermined position A scanning unit that scans the optical image with a laser beam emitted from the laser light source unit; and a light detection unit that receives the laser beam reflected by an obstacle located near the optical image. It is good.

  According to such a configuration, it is possible to extend the life of a virtual input interface device that allows a user to perform operation input on an optical image formed in space. In addition, since there is no need to replace the laser light source unit or the like, there is no maintenance cost for adjusting the irradiation position of the laser light on the optical image when replacing the laser light source unit. Further, there is no wasteful cost for replacing the laser light source unit with the scanning unit that does not need to be replaced.

  According to the laser apparatus of the present invention, it is possible to extend the service life with a simple configuration.

It is a figure which shows schematic structure (side view) of the virtual input interface device which concerns on 1st Embodiment of this invention. It is a perspective view which shows image formation by the reflective element aggregate substrate which concerns on 1st Embodiment of this invention. It is a partial schematic plan view of the reflective element assembly substrate according to the first embodiment of the present invention. It is a partial schematic perspective view of the reflective element aggregate substrate according to the first embodiment of the present invention. It is sectional drawing which shows the AA line cross section in FIG. It is a block diagram of the projector unit which concerns on 1st Embodiment of this invention. It is a top view which shows the structure of the place which looked at the light source holding member which concerns on 1st Embodiment of this invention from the back surface. It is a top view of the aperture which concerns on 1st Embodiment of this invention. It is a figure which shows the structure containing the side surface cross section of the light source holding member in the projector unit which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the place which looked at the light source holding member in the projector unit which concerns on 2nd Embodiment of this invention from the back surface. It is a top view of the aperture which concerns on 2nd Embodiment of this invention. It is a figure which shows the structure of the place which looked at the light source holding member in the projector unit which concerns on 3rd Embodiment of this invention from the back surface.

<First Embodiment>
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration (side view) of the virtual input interface device according to the first embodiment of the present invention.

  A virtual input interface device 10 (an example of a laser device) illustrated in FIG. 1 includes a two-sided corner reflector array substrate (reflective element assembly substrate) 1, a liquid crystal display unit 2, a projector unit 3, and a photodetector 4. ing.

  As shown in a schematic perspective view in FIG. 2, the two-sided corner reflector array substrate 1 (an example of an image forming unit) displays an optical image S of an image displayed by the liquid crystal display unit 2 (an example of an image light emitting unit) in the air. Is imaged so that the observer can see it. The configuration of the two-sided corner reflector array substrate 1 will be specifically described with reference to FIGS.

  A partial schematic plan view of the two-sided corner reflector array substrate 1 is shown in FIG. A partial schematic perspective view of the two-sided corner reflector array substrate 1 is shown in FIG.

  The two-sided corner reflector array substrate 1 has a configuration in which square-shaped through holes 1B penetrating the main surface of the substrate 1A in the vertical direction are arranged in a staggered manner in a plan view with respect to the substrate 1A. . Mirror surfaces M1 and M2 are respectively formed as two-surface corner reflectors on two orthogonal inner wall surfaces of the through-hole 1B.

  FIG. 5 shows a cross section taken along line AA in FIG. As shown in FIG. 5, the light beam emitted from the point light source o arranged in the space on the one main surface F2 side of the substrate 1A is reflected twice by the two-surface corner reflectors (mirror surfaces M1 and M2). Then, it passes through the substrate 1A while being bent. Each light beam emitted from the point light source o and directed to the different two-surface corner reflector is reflected twice by the two-surface corner reflector and then opposite to the main surface F2 of the substrate 1A on the side where the point light source o is disposed. Is formed into a single optical image p in the space on the main surface F1 side.

  The liquid crystal display unit 2 that emits surface light of the image can be regarded as a set of point light sources. Therefore, the light beam of the image light surface-emitted by the liquid crystal display unit 2 disposed in the space on the one main surface F2 side of the substrate 1A (the space below the main surface F2 in FIG. 2) is a two-surface corner reflector. Due to the reflection, an optical image S is formed at a position symmetrical to the liquid crystal display unit 2 in the space on the other main surface F1 side (the space above the main surface F1 in FIG. 2). Thereby, the user who is an observer can obtain the feeling that the image is displayed in the air.

  Then, the optical image S formed in the air is irradiated with infrared laser light that is two-dimensionally scanned from the projector unit 3. When a user who is an observer of the optical image S brings an operation article (such as a finger) close to the optical image S, infrared laser light is reflected by the operation article and received by the photodetector 4. Since the position operated by the operation article in the optical image S can be determined on the basis of the scanning position of the infrared laser light at the timing when the infrared laser light is detected by the photodetector 4, the position corresponding to the operated position can be determined. Control can be performed. That is, a function as a virtual input interface is realized.

  Next, the configuration of the projector unit 3 will be described in detail with reference to FIGS. FIG. 6 shows an overall configuration diagram including the optical system of the projector unit 3.

  As shown in FIG. 6, the projector unit 3 includes a plurality of laser light source units 31, a light source holding member 32 that holds the laser light source unit 31, a rotary shaft 33, bearings 34A and 34B, a first gear 35, a second gear 36, and a motor. 37, a rotation angle detection unit 38, and a drive control unit 39. FIG. 6 shows a side cross-section of the light source holding member 32.

  A plan view when the light source holding member 32 is viewed from the back surface is shown in FIG. The light source holding member 32 is a metal member having a disk shape as an outer shape, and includes five through-hole portions 321 penetrating in the thickness direction. Each through-hole portion 321 is provided such that the center position thereof is positioned while shifting the angle by 72 degrees in the circumferential direction of the light source holding member 32. That is, the through-hole portions 321 are arranged at equal intervals.

  Laser light source portions 31 </ b> A to 31 </ b> E are provided corresponding to the respective through-hole portions 321. In FIG. 6, the laser light source units 31 </ b> A to 31 </ b> E are unified as 31 and illustrated. Each laser light source unit 31 includes an infrared laser diode (infrared LD) 311 that emits infrared laser light, a relay substrate 312 for supplying a drive current to the infrared LD 311, and a collimator lens 313.

  The infrared LD 311 is fixed to the relay substrate 312, and each electrode terminal of the infrared LD 311 is electrically connected to the terminal portions 3121 and 3122 via wiring on the back surface of the relay substrate 312 (FIG. 7). The infrared LD 311 is inserted into the through-hole portion 321 from the back surface side, and the relay substrate 312 is fixed to the back surface of the light source holding member 32.

  A collimator lens 313 that converts infrared laser light emitted from the infrared LD 311 into substantially parallel light is held on the surface side of the through-hole portion 321. Thereby, each laser light source part 31 (31A-31E) is arrange | positioned in the circumferential direction of the light source holding member 32 at equal intervals.

  A bearing 34A is provided on the front surface side near the center of the light source holding member 32, and a bearing 34B is provided on the back surface side. The rotating shaft 33 passes through the bearing 34 </ b> A, the center of the light source holding member 32, and the bearing 34 </ b> B and is fixed to the light source holding member 32. A first gear 35 is fixed to the end of the rotating shaft 33 on the bearing 34B side.

  The second gear 36 that meshes with the first gear 35 is fixed to the drive shaft of the motor 37. Thereby, the driving force by the motor 37 is transmitted to the light source holding member 32 via the second gear 36, the first gear 35, and the rotating shaft 33. The drive control unit 39 drives and controls the motor 37 based on the detection signal from the rotation angle detection unit 38 disposed at the end of the first gear 35, thereby rotating the light source holding member 32 by the target angle. it can.

  Here, when the arbitrary laser light source unit 31 is disposed at a predetermined position by the rotational drive of the light source holding member 32, the aperture 40 is disposed above the collimator lens 313 of the laser light source unit 31 ( In FIG. 6, the right laser light source unit 31 is arranged at the predetermined position). The infrared laser light emitted from the infrared LD 311 of the laser light source unit 31 disposed at the predetermined position and converted into substantially parallel light by the collimator lens 313 is narrowed by an opening provided in the aperture 40.

  Here, the top view which looked at the aperture 40 (opening restriction | limiting part) from upper direction is shown in FIG. As shown in FIG. 8, the beam shape of the infrared laser light L (that is, the infrared laser light emitted from the laser light source unit 31) after passing through the collimator lens 313 is elliptical. The major axis direction of the ellipse is the circumferential direction of the light source holding member 32, that is, the driving direction S1. Thereby, when the light source holding member 32 is rotationally driven and the laser light source unit 31 is stopped at the predetermined position, the stationary position is displaced due to the backlash of the first gear 35 and the second gear 36 or the like. However, it is possible to suppress a decrease in the amount of infrared laser light after being narrowed by the opening 40A (FIG. 8) of the aperture 40.

  Part of the infrared laser light that has passed through the aperture 40 is reflected by the beam splitter 41 and received by the light detector 42, and part of the infrared laser light passes through the beam splitter 41 and enters the vertical scanning mirror 43. The light detection unit 42 is used for light emission power control of the infrared LD 311 by the light source control unit 45.

  The infrared laser light incident and reflected by the vertical scanning mirror 43 that can be deflected so as to scan the laser light in the vertical direction is incident on and reflected by the horizontal scanning mirror 44 that can be deflected so as to scan the laser light in the horizontal direction. Then, the light is emitted outside the housing of the projector unit 3. The vertical scanning mirror 43 and the horizontal scanning mirror 44 are configured by, for example, MEMS (Micro Electro Mechanical Systems) mirrors. The infrared laser light is two-dimensionally scanned by such deflection of the vertical scanning mirror 43 and the horizontal scanning mirror 44.

  Further, when the arbitrary laser light source unit 31 is arranged at the predetermined position by the rotational driving of the light source holding member 32, the terminal units 3121 and 3122 formed on the relay substrate 312 of the laser light source unit 31 (FIG. 7). The terminals 46A and 46B connected to the light source controller 45 are in contact with each other. Thereby, the light source control unit 45 can supply a drive current to the infrared LD 311 via the terminals 46A and 46B and the relay substrate 312.

  The terminals 46A and 46B are configured as brushes, leaf springs, pins, or the like, for example, so that contact with the terminal portions 3121 and 3122 and opening thereof can be performed without any problem. Therefore, since only one light source control unit 45 needs to be provided to drive the plurality of laser light source units 31, the configuration can be simplified.

  The control device 5 shown in FIG. 6 is provided in the virtual input interface device 10 and controls the drive control unit 39 and the light source control unit 45. In addition, the photodetector 4 (FIG. 1) generates infrared laser light. Based on the deflection state of the vertical scanning mirror 43 and the horizontal scanning mirror 44 at the detected timing, the operation position by the operation article in the optical image S is detected, and corresponding control is performed.

  In response to a command from the control device 5, the light source control unit 45 starts supplying drive current to the infrared LD 311 disposed at a predetermined upper position, and starts emission of the infrared LD 311. When the light emission is started, the light source control unit 45 controls the drive current so that the light emission power of the infrared LD 311 becomes constant based on the detection signal of the light detection unit 42.

  When the infrared LD 311 is driven to generate heat, the temperature rises. Since the light emission power of the infrared LD 311 decreases as the temperature rises, the light source controller 45 increases the drive current to maintain the light emission power constant. As a result, the temperature gradually rises and becomes constant and saturated in about 1 hour, for example. Therefore, the control device 5 instructs the light source control unit 45 to stop light emission at a timing immediately before the temperature is saturated, and the light source control unit 45 that has received the command stops driving the infrared LD 311. As a result, the life of the infrared LD 311 can be extended.

  The timing immediately before the temperature is saturated may be a timing at which a predetermined time elapses by measuring the elapsed time after the light source control unit 45 starts emitting light by the control device 5, for example. Alternatively, a temperature sensor may be provided in the vicinity of the infrared LD 311, and the control device 5 may monitor the temperature measured by the temperature sensor and set the timing when the temperature reaches a predetermined temperature. The temperature sensor may be provided inside each through-hole 321, or only one temperature sensor may be provided at a position near the collimator lens 313 at the predetermined position. Or it is good also as the timing when the electric current value of the drive current supplied by the light source control part 45 became a predetermined value.

  When the control device 5 instructs the light source control unit 45 to stop emitting light, the control device 5 instructs the drive control unit 39 to switch the laser light source unit 31. Here, with regard to switching of the laser light source unit 31, for example, it is desirable to move the laser light source unit 31 adjacent to the laser light source unit 31 currently located at the predetermined position to the predetermined position. In this case, the drive control unit 39 sets the target rotation angle to 144 degrees (= 72 degrees × 2), drives the motor 37 based on the detection signal of the rotation angle detection unit 38, and rotates the light source holding member 32. After the laser light source unit 31 is switched, the control device 5 instructs the light source control unit 45 to start the emission of the infrared LD 311 and the light source control unit 45 starts the light emission. According to this, it is possible to suppress the influence of heat from the laser light source unit 31 that has been lit ahead.

  In addition, the laser light source section is switched from 31A → 31C → 31E → 31B → 31D → 31A, and all the laser light source sections 31 are covered by rotating the light source holding member 32 in the same direction at the same angle by 144 degrees. This makes it possible to simplify the rotational drive control. Such an effect is effective when there are five or more odd numbers of laser light source units. In the case of an even number of 5 or more, it is not possible to rotate by the same angle, but it is possible to cover all while switching to laser light source units that are not adjacent to each other.

  As described above, according to the present embodiment, light emission control is performed while sequentially moving an arbitrary laser light source unit 31 among the plurality of laser light source units 31 to the predetermined position, so that the projector unit 3 and thus the virtual input interface are controlled. It is possible to extend the lifetime of the device 10 with a simple configuration.

  If only one laser diode is provided, the life of the projector unit is short, and when the projector unit is replaced, the irradiation position of the infrared laser light with respect to the optical image S formed in the space is shifted. Maintenance costs will be high. Further, since it is necessary to replace an optical system such as a scanning mirror that does not need to be replaced, useless cost is generated. In the present embodiment, such a problem is solved.

Second Embodiment
Next, a second embodiment of the present invention will be described. The present embodiment is a modification of the projector unit 3 in the first embodiment, and will be described with reference to FIGS.

  FIG. 9 is a configuration diagram of the projector unit 3 ′ including a side cross section of the light source holding member 32 ′, and FIG. 10 is a configuration diagram of the projector unit 3 ′ including a configuration when the light source holding member 32 ′ is viewed from the back surface. It is.

  The projector unit 3 ′ includes a rectangular light source holding member 32 ′ having five through-hole portions 321 ′ arranged at equal intervals in the longitudinal direction. A rack 322 'is formed on one side surface of the light source holding member 32' extending in the longitudinal direction.

  Each laser light source part 31 (31A to 31E in FIG. 10) is provided corresponding to each through-hole part 321 '. The relay substrate 312 to which the infrared LD 311 is fixed is fixed to the back surface side of the light source holding member 321 ′, and the infrared LD 311 is accommodated in the through hole portion 321 ′. In addition, the collimator lens 313 is held on the surface side of the through-hole portion 321 '. Thereby, the five laser light source units 31 (31A to 31E) are arranged in the longitudinal direction at equal intervals.

  A gear 35 'is provided so as to mesh with the rack 322'. A driving force from a motor (not shown) can be transmitted to the gear 35 '. Near the rack 322 ', a movement amount detection unit 38' for detecting the movement amount of the light source holding member 32 'in the longitudinal direction is provided. A drive control unit (not shown) drives the motor based on the detection signal of the movement amount detection unit 38 ′ to move the light source holding member 32 ′ in the longitudinal direction by the target movement amount (linear movement drive). .

  In a state where an arbitrary laser light source unit 31 is arranged at a predetermined position (position in the center in the longitudinal direction in FIGS. 9 and 10) by the movement of the light source holding member 32 ′, the laser light source unit 31 is positioned above the collimator lens 313. Is provided with an aperture 40. The configuration in which the infrared laser light emitted from the infrared LD 311 is scanned two-dimensionally is the same as in the first embodiment.

  As shown in FIG. 11, the beam shape of the infrared laser light L after passing through the collimator lens 313 is an ellipse, and the major axis direction of the ellipse is the longitudinal direction of the light source holding member 32 ′, that is, the moving direction. S2. Thereby, even when the stationary position of the laser light source unit 31 is displaced due to the movement of the light source holding member 32 ′, it is possible to suppress a decrease in the amount of infrared laser light after passing through the opening 40 </ b> A of the aperture 40.

  Further, when the arbitrary laser light source unit 31 is arranged at the predetermined position by the movement of the light source holding member 32 ′, the terminal units 3121 and 3122 formed on the back surface of the relay substrate 312 of the laser light source unit 31 are light sources. The terminals 46A and 46B connected to the control unit 45 are brought into contact with each other. Thereby, a drive current can be supplied from the light source control unit 45 to the infrared LD 311 via the relay substrate 312. Thus, only one light source control unit 45 needs to be provided for the plurality of laser light source units 31.

  The light emission stop control in consideration of the temperature of the laser light source unit 31 arranged at the predetermined position by the movement of the light source holding member 32 ′ is the same as that in the first embodiment. When the light emission of the laser light source unit 31 is stopped, the laser light source unit 31 is switched by the movement of the light source holding member 32 ′. At this time, switching to a laser light source unit 31 that is not adjacent is desirable. For example, the laser light source unit 31 arranged at the predetermined position is switched in the order of 31A → 31C → 31E → 31B → 31D → 31A in FIG.

  Also according to this embodiment, it is possible to extend the life of the projector unit 3 ′ with a simple configuration.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. FIG. 12 shows a schematic configuration of the projector unit according to the present embodiment. FIG. 12 is a diagram including a configuration of the light source holding member as viewed from the back side.

  The projector unit 3 ′ ′ shown in FIG. 12 includes a light source holding member 32 ′ ′ in which a plurality of through-hole portions 321 ′ ′ are formed in a matrix, and the laser light source portions 31A to 31A ′ correspond to the respective through-hole portions 321 ′ ′. 31F is provided.

  The light source holding member 32 ′ ′ can be driven in the X direction and the Y direction orthogonal to each other. As a driving method, a known XY table technique may be used. Thereby, arbitrary laser light source parts among laser light source parts 31A-31F can be moved to a predetermined position (position of laser light source part 31B in Drawing 12).

  Also in such an embodiment, since the light emission control is performed while switching the laser light source units in the plurality of laser light source units, it is possible to extend the lifetime of the projector unit 3 ′ ′ with a simple configuration.

  As mentioned above, although embodiment of this invention was described, if it is in the range of the meaning of this invention, embodiment may be variously deformed.

  For example, the laser device of the present invention is not limited to the virtual input interface device described above. For example, an optical system including an objective lens and an actuator for driving the objective lens may be provided in correspondence with a predetermined position where the laser light source unit is arranged by movement, and the optical disk may be irradiated with laser light. That is, the present invention can be applied to an optical disc apparatus.

1. Two-sided corner reflector array substrate (reflective element assembly substrate)
DESCRIPTION OF SYMBOLS 2 Liquid crystal display part 3 Projector unit 4 Photodetector 5 Control apparatus 10 Virtual input interface apparatus 31 (31A-31F) Laser light source part 311 Infrared laser diode 312 Relay board 3121, 3122 Terminal part 313 Collimator lens 32 Light source holding member 321 Through-hole portion 33 Rotating shaft 34A, 34B Bearing 35 First gear 36 Second gear 37 Motor 38 Rotation angle detector 39 Drive controller 40 Aperture 41 Beam splitter 42 Light detector 43 Vertical scanning mirror 44 Horizontal scanning mirror 45 Light source controller 46A, 46B terminals

Claims (8)

A plurality of laser light source units;
A holding member for holding the plurality of laser light source units;
A drive unit for driving the holding member;
A drive control unit that controls the drive unit to move an arbitrary laser light source unit of the plurality of laser light source units to a predetermined position;
A light source control unit that emits light from the laser light source unit moved to the predetermined position;
A laser device comprising: Further comprising an opening limiting portion that allows the laser light emitted from the laser light source portion that has been moved to the predetermined position to pass by being limited by the opening;
The laser light source according to claim 1, wherein a longitudinal direction of a beam shape of the emitted laser light is a driving direction of the holding member.   2. The drive control unit controls the drive unit to move the laser light source unit that is not adjacent to the laser light source unit disposed at the predetermined position to the predetermined position. The laser device according to claim 2.   The laser apparatus according to claim 3, wherein the number of the plurality of laser light source units is five or more, and the driving unit rotationally drives the holding member.   The laser apparatus according to claim 4, wherein the number of the plurality of laser light source units is an odd number. The light source control unit supplies a driving current to the laser diode so as to make the light emission power of the laser diode included in the laser light source unit constant,
The drive control unit switches the laser light source unit disposed at the predetermined position to another laser light source unit when a parameter related to the temperature of the laser diode reaches a predetermined value. The laser device according to any one of claims 1 to 5. The laser light source unit includes a laser diode and a relay substrate for supplying a driving current to the laser diode,
The said relay board | substrate is provided with the terminal part contacted with the terminal connected to the said light source control part, when the said laser light source part is moved to the said predetermined position. Item 7. The laser device according to any one of Items 6.   An image light emitting unit that emits image light, an image forming unit that forms image light from the image light emitting unit in the space as an optical image, and a laser emitted from the laser light source unit moved to the predetermined position The scanning part which scans light with respect to the optical image, and the light detection part which receives the laser beam reflected by the obstacle located near the optical image are further provided. Item 8. The laser device according to any one of Items 7.

Images