Light source device and electronic apparatus

Abstract

A light source device according to one aspect of the present disclosure comprises a first light source unit that emits a first laser light for drawing, and a second light source unit that emits a second laser light for monitoring, provided adjacent to the first light source unit. This light source device further comprises a light-receiving unit that receives the second laser light, and a control unit that performs light emission control of the first light source unit on the basis of detection signals from the light-receiving unit.

Description

Light source device and electronic device

[0001] The present disclosure relates to a light source device and an electronic device.

[0002] A technology that combines RGB laser light using an optical waveguide is being studied as a light source for AR (Augmented Reality) eyewear and projectors. Also, VCSELs (vertical cavity surface emitting lasers) have been studied as a low-power, eye-safe light source for AR eyewear. By combining these two technologies, it is possible to realize a low-power, ultra-compact RGB light source.

[0003] JP 2007-25256 A JP 2006-208794 A

[0004] In order to control the power of a light source, it is conceivable to monitor the light emission power of the light source and control the drive current in response to changes in the light emission power. Generally, the light emission power is monitored by branching the light emitted from the light source (see, for example, Patent Documents 1 and 2). However, doing so reduces the output power for drawing. Therefore, it is desirable to provide a light source device and electronic device that can monitor the light emission power of the light source without reducing the output power for drawing.

[0005] A light source device according to a first aspect of the present disclosure includes a first light source unit that emits a first laser beam for drawing, and a second light source unit that is disposed adjacent to the first light source unit and emits a second laser beam for monitoring. The light source device further includes a light receiving unit that receives the second laser beam, and a control unit that controls the light emission of the first light source unit based on a detection signal from the light receiving unit.

[0006] An electronic device according to a second aspect of the present disclosure includes the light source device according to the first aspect of the present disclosure.

[0007] In the light source device according to the first aspect of the present disclosure and the electronic device according to the second aspect of the present disclosure, a second light source unit that emits a second laser light for monitoring is provided adjacent to a first light source unit that emits a first laser light for drawing, whereby the second laser light is received by a light receiving unit and light emission control of the first light source unit can be performed based on a detection signal from the light receiving unit.

[0008] A light source device according to a third aspect of the present disclosure includes a plurality of first light source units that emit first laser beams for drawing having different emission wavelengths, and a plurality of second light source units that are provided adjacent to each first light source unit and emit second laser beams for monitoring having different wavelengths, and further includes a light receiving unit that receives the second laser beams, and a control unit that controls the light emission of the first light source units based on a detection signal from the light receiving unit.

[0009] An electronic device according to a fourth aspect of the present disclosure includes the light source device according to the third aspect of the present disclosure.

[0010] In the light source device according to a third aspect of the present disclosure and the electronic device according to a fourth aspect of the present disclosure, a second light source unit that emits a second laser light for monitoring having a different wavelength is provided adjacent to each of a plurality of first light source units that emit a first laser light for drawing, whereby the light receiving unit receives the plurality of second laser lights and light emission control of the first light source unit can be performed based on a detection signal from the light receiving unit.

[0011] FIG. 1 is a diagram illustrating an example of a schematic configuration of a light source device according to an embodiment of the present disclosure. FIG. 2 is a diagram illustrating an example of the internal configuration of the optical waveguide of FIG. 1. FIG. 3 is a diagram illustrating an example of a drive waveform of the light source of FIG. 1. FIG. 4 is a diagram illustrating an example of a drive waveform of the light source of FIG. 1. FIG. 5 is a diagram illustrating an example of the IL characteristic of the light source of FIG. 1. FIG. 6 is a diagram illustrating a modified example of the light source device of FIG. 1. FIG. 7 is a diagram illustrating an example of the internal configuration of the optical waveguide of FIG. 7. FIG. 8 is a diagram illustrating an example of the internal configuration of the optical waveguide of FIG. 2. FIG. 9 is a diagram illustrating an example of the internal configuration of the optical waveguide of FIG. 8. FIG. 10 is a diagram illustrating an example of the internal configuration of the light waveguide of FIG. 8. FIG. 11 is a diagram illustrating an application example of a light source device.

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following description is one specific example of the present disclosure, and the present disclosure is not limited to the following embodiment. Furthermore, the present disclosure is not limited to the arrangement, dimensions, and dimensional ratios of the components shown in the drawings. The description will be given in the following order: 1. Embodiment Example in which separate light sources and optical waveguides are provided for drawing and monitoring (FIGS. 1 to 6) 2. Modifications Modification A: Example in which multiple light sources for drawing are provided for each color (FIG. 7) Modification B: Example in which optical waveguides for monitoring are coupled (FIGS. 8 and 9) Modification C: Example in which optical fiber is used for the optical waveguide (FIGS. 10 and 11) Modification D: Example in which a mirror is used for the optical waveguide (FIGS. 12 and 13) 3. Application Examples Example in which the light source device is applied to eyeglasses (FIG. 14)

[0013] 1. Embodiment [Configuration] A light source device 1 according to an embodiment of the present disclosure will be described. Fig. 1 shows a schematic configuration example of the light source device 1. The light source device 1 is suitable for use as a light source for AR eyewear or a projector. The light source device 1 includes a light source unit 10, an optical waveguide unit 20, a light receiving unit 30, a control unit 40, and a storage unit 50.

[0014] The light source unit 10 has a plurality of light source units 11Gd, 11Bd, and 11Rd for drawing and a plurality of light source units 11Gm, 11Bm, and 11Rm for monitoring. The light source units 11Gd, 11Bd, and 11Rd emit drawing laser beams Lgd, Lbd, and Lrd having different emission wavelengths. The light source units 11Gm, 11Bm, and 11Rm emit monitoring laser beams Lgm, Lbm, and Lrm having different emission wavelengths. The emission wavelengths of the monitoring light source units 11Gm, 11Bm, and 11Rm are equal to the emission wavelengths of the drawing light source units 11Gm, 11Bm, and 11Rm.

[0015] The light source unit 11Gd emits, for example, green laser light Lgd (for example, a wavelength band of 500 nm or more and 550 nm or less). The light source unit 11Gm emits, for example, green laser light Lgm. The light source units 11Gd and 11Gm are surface-emitting semiconductor light-emitting devices (VCSELs) with a common emission wavelength formed on a common crystal growth substrate, and are made of, for example, a GaInN-based semiconductor material. The light source unit 11Gm is provided adjacent to the light source unit 11Gd and is made of the same material and layer structure as the light source unit 11Gd. Therefore, the light emission characteristics of the light source unit 11Gm are highly similar to those of the light source unit 11Gd.

[0016] The light source unit 11Bd emits, for example, blue laser light Lbd (for example, a wavelength band of 430 nm or more and 500 nm or less). The light source unit 11Bm emits, for example, blue laser light Lbm. The light source units 11Bd and 11Bm are surface-emitting semiconductor light-emitting devices (VCSELs) formed on a common crystal growth substrate and having a common emission wavelength, and are made of, for example, a GaInN-based semiconductor material. The light source unit 11Bm is provided adjacent to the light source unit 11Bd and is made of the same material and layer structure as the light source unit 11Bd. Therefore, the light emission characteristics of the light source unit 11Bm are highly similar to those of the light source unit 11Bd.

[0017] The light source unit 11Rd emits, for example, red laser light Lrd (for example, a wavelength band of 610 nm to 780 nm). The light source unit 11Rm emits, for example, red laser light Lrm. The light source units 11Rd and 11Rm are surface-emitting semiconductor light-emitting devices (VCSELs) formed on a common crystal growth substrate and having a common emission wavelength, and are made of, for example, a GaInN-based semiconductor material. The light source unit 11Rm is provided adjacent to the light source unit 11Rd and is made of the same material and layer structure as the light source unit 11Rd. Therefore, the light emission characteristics of the light source unit 11Rm are highly similar to those of the light source unit 11Rd.

[0018] 2 shows an example of the internal configuration of the optical waveguide unit 20. The optical waveguide unit 20 has an optical waveguide 21 and an optical waveguide 22. The optical waveguides 21 and 22 are, for example, planar lightwave circuits (PLCs), and are configured, for example, with a core having a high refractive index and a cladding that surrounds the core and has a lower refractive index than the core.

[0019] The optical waveguide 21 guides the drawing laser beams Lgd, Lbd, and Lbd from the light source units 11Gd, 11Bd, and 11Rd to the outside. The optical waveguide 21 includes optical waveguides 21g, 21b, and 21r, one for each of the light source units 11Gd, 11Bd, and 11Rd, and a multiplexing unit 21c that combines the optical waveguides 21g, 21b, and 21r. The optical waveguide 21g guides the drawing laser beam Lgd from the light source unit 11Gd to the multiplexing unit 21c. The optical waveguide 21b guides the drawing laser beam Lbd from the light source unit 11Bd to the multiplexing unit 21c. The optical waveguide 21r guides the drawing laser beam Lrd from the light source unit 11Rd to the multiplexing unit 21c. The multiplexing unit 21c is, for example, an optical component that couples the optical waveguides 21g, 21b, and 21r. The multiplexing unit 21c multiplexes the laser beams Lgd, Lbd, and Lrd that have propagated through the optical waveguides 21g, 21b, and 21r, and guides the multiplexed light to a single optical waveguide.

[0020] The optical waveguide 22 is an optical waveguide separate from the optical waveguide 21. The optical waveguide 22 guides the monitoring laser beams Lgm, Lbm, and Lbm from the light source units 11Gm, 11Bm, and 11Rm to the light receiving unit 30. The optical waveguide 22 has optical waveguides 22g, 22b, and 22r, one for each of the light source units 11Gm, 11Bm, and 11Rm. The optical waveguide 22g guides the drawing laser beam Lgd from the light source unit 11Gm to the light receiving unit 30g (described later). The optical waveguide 22b guides the drawing laser beam Lbd from the light source unit 11Bm to the light receiving unit 30b (described later). The optical waveguide 22r guides the drawing laser beam Lrd from the light source unit 11Rm to the light receiving unit 30r (described later).

[0021] The light receiving unit 30 receives the monitoring laser beams Lgm, Lbm, and Lbm. The light receiving unit 30 has a light receiving unit 30g that receives the monitoring laser beam Lgm, a light receiving unit 30b that receives the monitoring laser beam Lbm, and a light receiving unit 30r that receives the monitoring laser beam Lrm. The light receiving units 30g, 30b, and 30r are each composed of, for example, a photodiode that photoelectrically converts light in the visible region.

[0022] The storage unit 50 stores correction data used to control the light emission power of the light sources 11Gd, 11Bd, and 11Rd. The storage unit 50 is configured, for example, with a nonvolatile memory such as a flash memory. The correction data may include, for example, IL characteristic data (see FIG. 5) or ILT characteristic data (see FIG. 6), relative error data, and the like.

[0023] The control unit 40 controls the light emission of the light source units 11Gd, 11Bd, and 11Rd based on the detection signal from the light receiving unit 30. The control unit 40 also controls the light emission of the light source units 11Gm, 11Bm, and 11Rm. For example, as shown in FIGS. 3A and 3B, the control unit 40 controls the light emission power of the light source units 11Gd, 11Bd, and 11Rd based on the detection signal obtained from the light receiving unit 30 when the same drive signal is used to control the light emission of the light source units 11Gd, 11Bd, and 11Rd and the light source units 11Gm, 11Bm, and 11Rm. Hereinafter, this light emission control will be referred to as first light emission control. When the first light emission control is being performed, the active layer temperatures of the light source units 11Gm, 11Bm, and 11Rm are approximately equal to the active layer temperatures of the light source units 11Gd, 11Bd, and 11Rd. The light emission power of the laser beams Lgm, Lbm, and Lrm emitted from the light source units 11Gm, 11Bm, and 11Rm is approximately equal to the light emission power of the laser beams Lgd, Lbd, and Lrd emitted from the light source units 11Gd, 11Bd, and 11Rd.

[0024] The control unit 40 measures the I-L characteristics of the light sources 11Gm, 11Bm, and 11Rm while performing the first light-emission control. Specifically, while performing the first light-emission control, the control unit 40 temporarily applies, to the light sources 11Gm, 11Bm, and 11Rm, a drive signal (measurement drive signal) that is different from the drive signal applied to the light sources 11Gd, 11Bd, and 11Rd, as shown in FIGS. 4A and 4B. The control unit 40 applies the measurement drive signal to the light sources 11Gm, 11Bm, and 11Rm, and derives the I-L characteristic data of the light sources 11Gm, 11Bm, and 11Rm based on the detection signal obtained from the light-receiving unit 30 as a result.

[0025] 5, the IL characteristic data stored in the storage unit 50 as initial data is indicated by a dashed line, and the IL characteristic data derived by the control unit 40 is indicated by a solid line. The difference between these two IL characteristic data is due to, for example, aging of the light source units 11Gm, 11Bm, and 11Rm.

[0026] The control unit 40 may measure the I-LT characteristic data of the light source units 11Gm, 11Bm, and 11Rm while performing the first light emission control. In this case, the control unit 40 first measures the active layer temperatures T of the light source units 11Gm, 11Bm, and 11Rm based on the detection signals obtained from the light receiving unit 30 while performing the first light emission control. The control unit 40 measures the active layer temperatures T of the light source units 11Gm, 11Bm, and 11Rm, for example, using the following equation: T=F(I,P) where I: current I (value set by the control unit 40) flowing through the light source units 11Gm, 11Bm, and 11Rm; P: light emission power P of the light source units 11Gm, 11Bm, and 11Rm obtained based on the detection signals obtained from the light receiving unit 30; and F(I,P): a function with the current I (value set by the control unit 40) and the light emission power P as parameters.

[0027] Next, the control unit 40 derives I-LT characteristic data of the light source units 11Gm, 11Bm, and 11Rm based on the obtained active layer temperature T and the detection signal obtained from the light receiving unit 30 by applying the measurement drive signal to the light source units 11Gm, 11Bm, and 11Rm. That is, the control unit 40 derives the I-LT characteristic data of the light source units 11Gm, 11Bm, and 11Rm based on the detection signal obtained from the light receiving unit 30 by the first light emission control and the detection signal obtained from the light receiving unit 30 by applying the measurement drive signal to the light source units 11Gm, 11Bm, and 11Rm.

[0028] 6, the I-LT characteristic data stored in the storage unit 50 as initial data is indicated by a dashed line, and the I-LT characteristic data derived by the control unit 40 is indicated by a solid line. The difference between these two sets of I-L characteristic data is due to, for example, aging of the light sources 11Gm, 11Bm, and 11Rm.

[0029] [Effects] Next, the effects of the light source device 1 according to this embodiment will be described.

[0030] In recent years, technology has been studied that combines RGB laser light using an optical waveguide as a light source for AR eyewear and projectors. VCSELs have also been studied as a low-power, eye-safe light source for AR eyewear. By combining these two technologies, it is possible to realize a low-power, ultra-compact RGB light source.

[0031] In order to control the power of a light source, it is possible to monitor the light emission power of the light source and control the drive current in response to changes in the light emission power. Generally, the light emission power is monitored by branching the light emitted from the light source.

[0032] For example, in the invention described in Patent Document 1, in an arrayed optical waveguide coupled to a plurality of light-emitting elements, each waveguide is provided with a main waveguide and branch waveguides, and the branch waveguides are joined together to form a coupled waveguide. Light output from the coupled waveguide is received by a single light-receiving element. Furthermore, for example, in the invention described in Patent Document 2, a light-emitting element and an optical waveguide that guides light emitted from the light-emitting element are provided, and a slit is provided in part of the optical waveguide, and light leaking from the slit is monitored by a light-receiving element.

[0033] However, in the inventions described in Patent Documents 1 and 2, when drawing an image, multiple light-emitting elements emit light simultaneously, making it impossible to control the light-emitting power for each light-emitting element. Furthermore, because a portion of the light output from the light-emitting elements is branched to the light-receiving elements, the light-emitting power of the light used for drawing an image decreases. Furthermore, if light is emitted for light-emitting control separately from the light emitted for drawing, the user will see the light emitted for light-emitting control.

[0034] On the other hand, in the present embodiment, a plurality of monitoring light source units 11Gm, 11Bm, and 11Rm are provided adjacent to each of the plurality of drawing light source units 11Gd, 11Bd, and 11Rd. This allows the light receiving unit 30 to receive the plurality of monitoring laser beams Lgm, Lbm, and Lrm, and enables light emission control of the plurality of drawing light source units 11Gd, 11Bd, and 11Rd based on detection signals from the light receiving unit 30. As a result, the light emission power of the light source units 11Gd, 11Bd, and 11Rd can be monitored without reducing the drawing output power.

[0035] In the present embodiment, the imaging light source unit 11Gd and the monitoring light source unit 11Gm are semiconductor light-emitting elements formed on a common semiconductor substrate. The imaging light source unit 11Bd and the monitoring light source unit 11Bm are semiconductor light-emitting elements formed on a common semiconductor substrate. The imaging light source unit 11Rd and the monitoring light source unit 11Rm are semiconductor light-emitting elements formed on a common semiconductor substrate. This increases the similarity between the light emission characteristics of the monitoring light source unit 11Gm and the light emission characteristics of the imaging light source unit 11Gd. Furthermore, increases the similarity between the light emission characteristics of the monitoring light source unit 11Bm and the light emission characteristics of the imaging light source unit 11Bd. Furthermore, increases the similarity between the light emission characteristics of the multiple monitoring laser beams Lgm, Lbm, and Lrm and the light emission characteristics of the imaging light source unit 11Rd. As a result, the relative error between the light emission characteristics of the light source unit 11Gm for monitoring and the light emission characteristics of the multiple light source units 11Gd, 11Bd, and 11Rd for drawing can be stored in advance in the memory unit 50 as correction data and can be used when controlling the light emission.

[0036] In the present embodiment, when the first light emission control is being performed, the light emission power of the plurality of light source units 11Gd, 11Bd, and 11Rd for drawing is controlled based on the detection signal obtained from the light receiving unit 30. Here, when the first light emission control is being performed, the active layer temperatures of the light source units 11Gm, 11Bm, and 11Rm are approximately equal to the active layer temperatures of the light source units 11Gd, 11Bd, and 11Rd. Furthermore, the light emission power of the laser beams Lgm, Lbm, and Lrm emitted from the light source units 11Gm, 11Bm, and 11Rm is approximately equal to the light emission power of the laser beams Lgd, Lbd, and Lrd emitted from the light source units 11Gd, 11Bd, and 11Rd. Therefore, the light emission power of the multiple light source units 11Gd, 11Bd, and 11Rd for drawing can be accurately controlled based on the detection signals obtained by receiving the multiple monitoring laser beams Lgm, Lbm, and Lrm at the light receiving unit 30.

[0037] Furthermore, in this embodiment, a drive signal different from the drive signal applied to the plurality of light sources 11Gd, 11Bd, and 11Rd for drawing is applied to the plurality of light sources 11Gm, 11Bm, and 11Rm for monitoring, and the light emission power of the plurality of light sources 11Gm, 11Bm, and 11Rm for monitoring is controlled based on a detection signal (second detection signal) obtained from the light receiving unit 30 at that time and a detection signal obtained by the first light emission control. Here, the active layer temperature T of the plurality of light sources 11Gm, 11Bm, and 11Rm for monitoring can be derived from the second detection signal, and the light emission power of the plurality of light sources 11Gm, 11Bm, and 11Rm for monitoring can be controlled based on I-L characteristic data corresponding to the derived active layer temperature T. As a result, the light emission power of the plurality of light sources 11Gd, 11Bd, and 11Rd for drawing can be controlled with high precision.

[0038] 2. Modifications Next, modifications of the light source device 1 according to the above embodiment will be described.

[0039] [Variation A] In the above embodiment, for example, as shown in Fig. 7, a plurality of light source units 11Gd that emit green laser light Lgd may be provided. Also, in the above embodiment, for example, as shown in Fig. 7, a plurality of light source units 11Bd that emit blue laser light Lbd may be provided. Also, in the above embodiment, for example, as shown in Fig. 7, a plurality of light source units 11Rd that emit red laser light Lrd may be provided.

[0040] [Variation B] In the above-described embodiment and its variations, for example, as shown in FIG. 8, the optical waveguide 22 may include optical waveguides 22g, 22b, and 22r and a multiplexing section 22c that couples the optical waveguides 22g, 22b, and 22r. In this case, the multiplexing section 22c is, for example, an optical component that couples the optical waveguides 22g, 22b, and 22r. The multiplexing section 22c multiplexes the laser beams Lgm, Lbm, and Lrm that have propagated through the optical waveguides 22g, 22b, and 22r, and guides the multiplexed light to a single optical waveguide. The multiplexed light is incident on a single light receiving section 30. Therefore, in this variation, the number of light receiving sections 30 can be reduced compared to the above-described embodiment.

[0041] Here, the control unit 30 can control the light emission of each of the monitor light source units 11Gm, 11Bm, and 11Rm by sequentially emitting light in a time series, as shown in Figure 9, for example.

[0042] [Modification C] In the above-described embodiment and its modifications, for example, as shown in Fig. 10 and Fig. 11 , an optical waveguide 60 may be provided instead of the optical waveguide 20. The optical waveguide 60 corresponds to the optical waveguide 20 in which all of the optical waveguides are replaced with optical fibers. Even when optical fibers are used in this way, the light emission power of the plurality of light sources 11Gd, 11Bd, and 11Rd for drawing can be controlled with high precision, as in the above-described embodiment.

[0043] [Variation D] In the above-described embodiments and variations thereof, for example, as shown in Figures 12 and 13, an optical waveguide 70 may be provided instead of the optical waveguide 20. For example, as shown in Figure 12, the optical waveguide 70 corresponds to a configuration in which the optical waveguide in the optical waveguide 20 is omitted, and reflection mirrors 71 and 73 and dichroic mirrors 72 and 74 are provided in the optical paths of the laser beams Lgd, Lbd, and Lrd, and reflection mirrors 75, 76, and 77 are provided in the optical paths of the laser beams Lgm, Lbm, and Lrm. Furthermore, for example, as shown in Figure 13, the optical waveguide in the optical waveguide 20 is omitted, and reflection mirrors 71 and 73 and dichroic mirrors 72 and 74 are provided in the optical paths of the laser beams Lgd, Lbd, and Lrd, and reflection mirror 75 and dichroic mirrors 78 and 79 are provided in the optical paths of the laser beams Lgm, Lbm, and Lrm. In this way, even when a reflecting mirror or a dichroic mirror is used, the light emission power of the plurality of light source units 11Gd, 11Bd, and 11Rd for drawing can be controlled with high precision, as in the above embodiment.

[0044] 3. Application Examples Next, application examples of the light source device 1 according to the above-described embodiment and its modified examples will be described.

[0045] 14 shows a schematic configuration example of eyeglasses 100 equipped with a light source device 1 according to the above embodiment and its modified example. The eyeglasses 100 are equipped with a right-eye image projection unit 110R, a right-eye combiner 120R, and a right-eye image capture unit 130R. The eyeglasses 100 are further equipped with a left-eye image projection unit 110L, a left-eye combiner 120L, and a left-eye image capture unit 130L.

[0046] The image projection units 110R and 110L each include a light source device 1 (R) that emits R (red) light, a light source device 1 (G) that emits G (green) light, a light source device 1 (B) that emits B (blue) light, and an optical waveguide 2 that combines the R light, G light, and B light. The image projection unit 110R further includes a mirror 3 that reflects white light generated by combining in the optical waveguide 2, and a scanning mirror 4 that scans the white light reflected by the mirror 3 in two axial directions across the surface of the combiner 120R via a lens 5. The image projection unit 110L further includes a mirror 3 that reflects white light generated by combining in the optical waveguide 2, and a scanning mirror 4 that scans the white light reflected by the mirror 3 in two axial directions across the surface of the combiner 120L via a lens 5.

[0047] The combiner 120R diffracts the light drawn on the surface of the combiner 120R by the image projection unit 110R and projects it onto the retina of the right eye 1000R. The imaging unit 130R acquires image data including the right eye 1000R by imaging, and detects the position of the right eye 1000R from the acquired image data. The imaging unit 130R outputs the detected position of the right eye 1000R to the image projection unit 110R. The image projection unit 110R controls the scanning of the scanning mirror 4 so that light is projected onto the position of the right eye 1000R obtained from the imaging unit 130R.

[0048] The combiner 120L diffracts the light drawn on the surface of the combiner 120L by the image projection unit 110L and projects it onto the retina of the left eye 1000L. The imaging unit 130L acquires image data including the left eye 1000L by imaging, and detects the position of the left eye 1000L from the acquired image data. The imaging unit 130L outputs the detected position of the left eye 1000L to the image projection unit 110L. The image projection unit 110L controls the scanning of the scanning mirror 4 so that light is projected onto the position of the left eye 1000L obtained from the imaging unit 130L.

[0049] In this application example, the light source device 1 according to the above embodiment and its modification is used as a light source for the image projection units 110R and 110L. This makes it possible to monitor optical coupling and optical output in the image projection units 110R and 110L with an easily realizable configuration.

[0050] Although the present disclosure has been described above using embodiments, the present disclosure is not limited to the above embodiments and various modifications are possible. Note that the effects described in this specification are merely examples. The effects of the present disclosure are not limited to the effects described in this specification. The present disclosure may have effects other than those described in this specification.

[0051] Furthermore, for example, the present disclosure can have the following configurations. (1) A light source device comprising: a first light source unit that emits a first laser light for drawing; a second light source unit that is provided adjacent to the first light source unit and emits a second laser light for monitoring; a light receiving unit that receives the second laser light; and a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit. (2) The light source device described in (1), in which the first light source unit and the second light source unit are semiconductor light emitting elements that have a common emission wavelength and are formed on a common semiconductor substrate. (3) The light source device described in (2), in which the control unit controls the light emission power of the first light source unit based on a first detection signal obtained from the light receiving unit when light emission control is performed for the first light source unit and the second light source unit with the same drive signal. (4) The light source device described in (3), in which the control unit applies a drive signal to the second light source unit that is different from the drive signal applied to the first light source unit, and controls the light emission power of the first light source unit based on a second detection signal obtained from the light receiving unit at that time. (5) The light source device according to (4), further comprising: a storage unit that stores correction data used to control the light emission power of the first light source unit, wherein the control unit controls the light emission power of the first light source unit based on the first detection signal, the second detection signal, and the correction data. (6) The light source device according to any one of (1) to (5), further comprising: a first optical waveguide that guides the first laser light from the first light source unit to the outside; and a second optical waveguide that is separate from the first optical waveguide and guides the second laser light from the second light source unit to the light receiving unit. (7) The light source device according to any one of (1) to (5), further comprising: a first optical fiber that guides the first laser light from the first light source unit to the outside; and a second optical fiber that is different from the first optical fiber and guides the second laser light from the second light source unit to the light receiving unit.(8) A light source device comprising: a plurality of first light source units that emit first laser light for drawing having different emission wavelengths; a plurality of second light source units that are provided adjacent to each of the first light source units and emit second laser light for monitoring having different wavelengths; a light receiving unit that receives the plurality of second laser light; and a control unit that controls light emission of the first light source units based on detection signals from the light receiving units. (9) The light source device described in (8), wherein each of the second light source units is provided adjacent to a first light source unit that has a common emission wavelength, and the first light source unit and the second light source unit that have a common emission wavelength are semiconductor light emitting elements formed on a common semiconductor substrate. (10) The light source device described in (9), wherein the control unit controls the light emission power of the first light source unit based on a first detection signal obtained from the light receiving unit when light emission control is being performed with the same drive signal, for each of the first light source unit and the second light source unit that have a common emission wavelength. (11) The light source device according to (10), wherein the control unit applies to each of the second light source units a drive signal different from a drive signal applied to the first light source units having a common emission wavelength, and controls the emission power of each of the first light source units based on a second detection signal obtained from the light receiving unit at that time. (12) The light source device according to (11), further comprising: a storage unit that stores correction data used to control the emission power of each of the first light source units, and the control unit controls the emission power of each of the first light source units based on the first detection signal, the second detection signal, and the correction data. (13) The light source device according to any one of (8) to (12), further comprising: a first optical waveguide that guides the first laser light from each of the first light source units to the outside; and a second optical waveguide that guides the second laser light from each of the second light source units to the light receiving unit, the second optical waveguide being separate from the first optical waveguide. (14) The light source device described in (13), wherein the first optical waveguide has a plurality of third optical waveguides, one for each of the first light source units, and a first combining unit that combines the plurality of third optical waveguides; the second optical waveguide has a plurality of fourth optical waveguides, one for each of the second light source units; and the light receiving unit has a plurality of light receiving elements, one for each of the fourth optical waveguides.(15) The light source device according to (13), wherein the first optical waveguide has a plurality of third optical waveguides, one for each of the first light source units, and a first combining section that combines the plurality of third optical waveguides, and the second optical waveguide has a plurality of fourth optical waveguides, one for each of the first light source units, and a second combining section that combines the plurality of fourth optical waveguides. (16) The light source device according to (8), further comprising: a first optical fiber that guides the first laser light from each of the first light source units to the outside; and a second optical fiber, different from the first optical fiber, that guides the second laser light from each of the second light source units to the light receiving unit. (17) The light source device according to (16), wherein the first optical fiber has a plurality of third optical fibers provided one for each of the first light source units and a first multiplexing section that couples the plurality of third optical fibers, the second optical fiber has a plurality of fourth optical fibers provided one for each of the second light source units, and the light receiving section has a plurality of light receiving elements provided one for each of the fourth optical waveguides. (18) The light source device according to (16), wherein the first optical fiber has a plurality of third optical fibers provided one for each of the first light source units and a first multiplexing section that couples the plurality of third optical fibers, and the second optical fiber has a plurality of fourth optical fibers provided one for each of the second light source units and a second multiplexing section that couples the plurality of fourth optical fibers. (19) An electronic device comprising: a light source device having: a first light source unit that emits a first laser beam for drawing, a second light source unit that is provided adjacent to the first light source unit and emits a second laser beam for monitoring, a light receiving unit that receives the second laser beam, and a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit. (20) An electronic device comprising: a light source device having: a plurality of first light source units that emit first laser beams for drawing having mutually different wavelengths, a plurality of second light source units that are provided adjacent to each of the first light source units and emit second laser beams for monitoring having mutually different wavelengths, a light receiving unit that receives the plurality of second laser beams, and a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit.

[0052] In the light source device according to the first aspect of the present disclosure and the electronic device according to the second aspect of the present disclosure, a second light source unit that emits a second laser light for monitoring is provided adjacent to a first light source unit that emits a first laser light for drawing. This allows the second laser light to be received by a light receiving unit, and light emission control of the first light source unit can be performed based on a detection signal from the light receiving unit. As a result, the light emission power of the light source can be monitored without reducing the output power for drawing.

[0053] In a light source device according to a third aspect of the present disclosure and an electronic device according to a fourth aspect of the present disclosure, a second light source unit that emits a second laser light for monitoring having a wavelength different from each other is provided adjacent to each of a plurality of first light source units that emit a first laser light for drawing. This allows a light receiving unit to receive the plurality of second laser lights, and light emission control of the first light source unit can be performed based on a detection signal from the light receiving unit. As a result, the light emission power of the light source can be monitored without reducing the output power for drawing. Note that the effects of the present disclosure are not necessarily limited to the effects described herein and may be any of the effects described herein.

[0054] This application claims priority based on Japanese Patent Application No. 2021-119675, filed on July 20, 2021, in the Japan Patent Office, the entire contents of which are incorporated herein by reference.

[0055] Those skilled in the art will recognize that various modifications, combinations, subcombinations, and variations may occur depending on design requirements and other factors, and are intended to be within the scope of the appended claims and their equivalents.

Claims

1. a first light source unit that emits a first laser light for drawing; a second light source unit provided adjacent to the first light source unit and configured to emit a second laser light for monitoring; a light receiving unit that receives the second laser light; a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit; Equipped with Light source device.

2. The first light source unit and the second light source unit are semiconductor light emitting elements formed on a common semiconductor substrate and having a common emission wavelength. The light source device according to claim 1 .

3. The control unit controls light emission power of the first light source unit based on a first detection signal obtained from the light receiving unit while performing light emission control for the first light source unit and the second light source unit using the same drive signal. The light source device according to claim 2 .

4. The control unit applies to the second light source unit a drive signal different from a drive signal applied to the first light source unit, and controls a light emission power of the first light source unit based on a second detection signal obtained from the light receiving unit at that time. The light source device according to claim 3 .

5. A storage unit that stores correction data used to control the light emission power of the first light source unit, The control unit controls the light emission power of the first light source unit based on the first detection signal, the second detection signal, and the correction data. The light source device according to claim 4 .

6. a first optical waveguide that guides the first laser light from the first light source unit to an outside; a second optical waveguide separate from the first optical waveguide, which guides the second laser light from the second light source unit to the light receiving unit; Further equipped The light source device according to claim 1 .

7. a first optical fiber that guides the first laser light from the first light source unit to an outside; a second optical fiber different from the first optical fiber, which guides the second laser light from the second light source unit to the light receiving unit; Further equipped The light source device according to claim 1 .

8. a plurality of first light source units each emitting a first laser beam for drawing having a different emission wavelength from each other; a plurality of second light source units provided adjacent to each of the first light source units and emitting second laser beams for monitoring having emission wavelengths different from each other; a light receiving unit that receives a plurality of the second laser beams; a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit; Equipped with Light source device.

9. Each of the second light source units is provided adjacent to the first light source unit having a common emission wavelength, The first light source unit and the second light source unit having a common emission wavelength are semiconductor light emitting elements formed on a common semiconductor substrate. The light source device according to claim 8 .

10. The control unit controls the light emission power of the first light source unit based on a first detection signal obtained from the light receiving unit when light emission control is performed by the same drive signal for each of the first light source unit and the second light source unit having a common light emission wavelength. The light source device according to claim 9 .

11. The control unit applies to each of the second light source units a drive signal different from a drive signal applied to the first light source units having a common emission wavelength, and controls the emission power of each of the first light source units based on a second detection signal obtained from the light receiving unit at that time. The light source device according to claim 10.

12. A storage unit that stores correction data used to control the light emission power of each of the first light source units, The control unit controls the light emission power of each of the first light source units based on the first detection signal, the second detection signal, and the correction data. The light source device according to claim 11.

13. a first optical waveguide that guides the first laser light from each of the first light source units to an outside; a second optical waveguide separate from the first optical waveguide, which guides the second laser light from each of the second light source units to the light receiving unit; Further equipped The light source device according to claim 8 .

14. the first optical waveguide includes a plurality of third optical waveguides provided for the first light source units, one for each of the first light source units, and a first combining unit that combines the plurality of third optical waveguides; the second optical waveguide includes a plurality of fourth optical waveguides, one for each of the second light source units; The light receiving section has a plurality of light receiving elements, one for each of the fourth optical waveguides. The light source device according to claim 13.

15. the first optical waveguide includes a plurality of third optical waveguides provided for the first light source units, one for each of the first light source units, and a first combining unit that combines the plurality of third optical waveguides; The second optical waveguide includes a plurality of fourth optical waveguides, one for each of the second light source units, and a second combining unit that combines the plurality of fourth optical waveguides. The light source device according to claim 13.

16. a first optical fiber that guides the first laser light from each of the first light source units to an outside; a second optical fiber different from the first optical fiber, which guides the second laser light from each of the second light source units to the light receiving unit; Further equipped The light source device according to claim 8 .

17. the first optical fiber includes a plurality of third optical fibers provided for each of the first light source units, and a first multiplexing unit that couples the plurality of third optical fibers; the second optical fiber includes a plurality of fourth optical fibers, one for each of the second light source units; The light receiving unit has a plurality of light receiving elements, one for each of the fourth fibers.

17. A light source device according to claim 16.

18. the first optical fiber includes a plurality of third optical fibers provided for each of the first light source units, and a first multiplexing unit that couples the plurality of third optical fibers; The second optical fiber includes a plurality of fourth optical fibers provided for each of the second light source units, and a second multiplexing unit that couples the plurality of fourth optical fibers. The light source device according to claim 16.

19. A light source device is provided, The light source device is a first light source unit that emits a first laser light for drawing; a second light source unit provided adjacent to the first light source unit and configured to emit a second laser light for monitoring; a light receiving unit that receives the second laser light; a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit; have electronic equipment.

20. A light source device is provided, The light source device is a plurality of first light source units each emitting a first laser beam for drawing having a different emission wavelength from each other; a plurality of second light source units provided adjacent to each of the first light source units and emitting second laser beams for monitoring having emission wavelengths different from each other; a light receiving unit that receives a plurality of the second laser beams; a control unit that controls light emission of the first light source unit based on a detection signal from the light receiving unit; have electronic equipment.