Light source device, and projection device

Abstract

To reduce irregularities of illuminance when reducing the illuminance of light applied from a light source device much more than predetermined illuminance.SOLUTION: A light source device includes a first light source section capable of emitting first light from first light emitting sections, a second light source section capable of emitting second light from second light emitting sections, a light transmission member for transmitting the first and second incident light, and a drive section capable of individually driving the first light emitting sections and the second light emitting sections, and can apply the first light and the second light transmitted by the light transmission member. The drive section can individually reduce a quantity of first light emitted from each of the first light emitting sections and a quantity of second light emitted from each of the second light emitting sections, or can individually extinguish the first light emitting sections and the second light emitting sections, and the first light is allowed to go into the light transmission member at a positive angle relative to a center axis when viewing the light transmission member from a direction orthogonal to the center axis of the light transmission member, and the second light is allowed to go into the light transmission member at a negative angle relative to the center axis when viewing the light transmission member from a direction orthogonal to the center axis.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a light source device and a projection device. [Background technology]

[0002] 2. Description of the Related Art Light source devices that have a plurality of light-emitting sections and are capable of emitting light, as well as projection devices such as projectors that have such light source devices, are known.

[0003] Furthermore, in order to extend the life of the light source device and reduce power consumption, a configuration has been disclosed in which, when a signal is input regarding the number of multiple light sources to be turned on, the light sources to be used are selected and the light sources not selected are turned off (see, for example, Patent Document 1). Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the device of Patent Document 1, when the illuminance of the light irradiated from the light source device is made lower than a predetermined illuminance, uneven illuminance may occur in the light irradiated from the light source device depending on the position of the light source selected from the multiple light sources.

[0005] The present disclosure aims to reduce uneven illuminance when the illuminance of light emitted from a light source device is made lower than a predetermined illuminance. [Means for solving the problem]

[0006] A light source device according to one aspect of the present disclosure includes a first light source unit capable of emitting a first light from one or more first light-emitting units, a second light source unit capable of emitting a second light from one or more second light-emitting units, a light-transmitting member that transmits the first light and the second light incident thereon, and a drive unit capable of individually driving the one or more first light-emitting units and the one or more second light-emitting units, and is capable of irradiating the first light and the second light transmitted through the light-transmitting member, wherein the drive unit is capable of individually reducing an amount of the first light emitted from each of the one or more first light-emitting units and the second light emitted from each of the one or more second light-emitting units, or individually turning off the one or more first light-emitting units and the one or more second light-emitting units, wherein the first light is incident on the light-transmitting member at a positive angle with respect to a central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis, and the second light is incident on the light-transmitting member at a negative angle with respect to the central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis.

[0007] A light source device according to one aspect of the present disclosure includes a first light source unit capable of emitting a first light from one or more first light-emitting units, a second light source unit capable of emitting a second light from one or more second light-emitting units, a light-transmitting member that transmits the first light and the second light incident thereon, a drive unit capable of individually driving the one or more first light-emitting units and the one or more second light-emitting units, and a control unit that controls an operation of the drive unit, and is capable of irradiating the first light and the second light that have transmitted through the light-transmitting member, and the drive unit drives the first light and the second light emitted from each of the one or more first light-emitting units, the control unit is capable of individually reducing the amount of the second light emitted from each of the second light-emitting units, or individually turning off one or more of the first light-emitting units and one or more of the second light-emitting units, and is capable of alternately switching, at a predetermined switching period, between a state in which both the first light and the second light are incident on the light-transmitting member at a positive angle with respect to the central axis of the light-transmitting member, when the light-transmitting member is viewed from a direction perpendicular to the central axis of the light-transmitting member, and a state in which both the first light and the second light are incident on the light-transmitting member at a negative angle with respect to the central axis. Effect of the Invention

[0008] According to the present disclosure, when the illuminance of light emitted from a light source device is made lower than a predetermined illuminance, illuminance unevenness can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram showing a configuration of a light source device according to a first embodiment of the present disclosure. [Diagram 2] 3 is a block diagram showing a hardware configuration of a control unit included in the light source device according to the first embodiment of the present disclosure. FIG. [Diagram 3] 4 is a block diagram showing a functional configuration of a control unit included in the light source device according to the first embodiment of the present disclosure. FIG. [Figure 4] 5 is a diagram showing correspondence information used by a control unit of the light source device according to the first embodiment of the present disclosure. FIG. [Diagram 5] 4 is a flow diagram showing processing by a control unit included in the light source device according to the first embodiment of the present disclosure. FIG. [Figure 6] 6 is a diagram showing a configuration of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 7] 11 is a schematic plan view showing a wavelength conversion element included in a light source device according to a second embodiment of the present disclosure. FIG. [Figure 8] FIG. 11 is a schematic plan view showing a color wheel included in a light source device according to a second embodiment of the present disclosure. [Figure 9] 13 is a diagram showing the relationship between the output of excitation light and the output of light emitted from a wavelength conversion element in a light source device according to a second embodiment of the present disclosure. FIG. [Figure 10] 11 is a timing chart showing the output of excitation light in a first mode of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 11] 11 is a timing chart showing the output of wavelength-converted light in a first mode of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 12] 11 is a timing chart showing the output of excitation light in a second mode of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 13]11 is a timing chart showing the output of wavelength-converted light in a second mode of a light source device according to a second embodiment of the present disclosure. FIG. [Figure 14] 13 is a schematic diagram showing a configuration of a light source device according to a third embodiment of the present disclosure. FIG. [Figure 15] 13 is a diagram showing a first example of an illuminance distribution of light emitted from a light source device according to a third embodiment of the present disclosure. FIG. [Figure 16] 13 is a diagram showing a second example of the illuminance distribution of light irradiated from the light source device according to the third embodiment of the present disclosure. FIG. [Figure 17] 13 is a diagram showing a third example of the illuminance distribution of light irradiated from the light source device according to the third embodiment of the present disclosure. FIG. [Figure 18] 13 is a diagram showing a fourth example of the illuminance distribution of light irradiated from the light source device according to the third embodiment of the present disclosure. FIG. [Figure 19] 13 is a diagram showing a fifth example of the illuminance distribution of light irradiated from the light source device according to the third embodiment of the present disclosure. FIG. [Figure 20] 13 is a schematic diagram showing a configuration of a light source device according to a modified example of the third embodiment of the present disclosure. FIG. [Figure 21] 13 is a schematic diagram showing a configuration of a projection device according to a fourth embodiment of the present disclosure. FIG. [Figure 22] 13 is a block diagram showing another example of a control unit included in the light source device according to the embodiment of the present disclosure. FIG. [Figure 23] 10 is a flowchart showing an example of the operation of the light source device when switching the set of light sources every time the light source device is started. [Figure 24] 11 is a flowchart showing an example of the operation of the light source device when switching between sets of light sources every predetermined time, every predetermined number of days, or every predetermined accumulated lighting time. [Diagram 25] 10 is a flowchart showing an example of the operation of the light source device when switching between sets of light sources after a predetermined time has elapsed since activation. [Figure 26] 10 is a flowchart showing an example of the operation of the light source device when switching between sets of light sources at the time of switching between input signals after a predetermined time has elapsed since activation. [Figure 27]10 is a flowchart illustrating an example of an operation for changing a predetermined time for switching in a light source device according to an embodiment of the present disclosure. [Figure 28] FIG. 11 is a diagram illustrating an example of the (X+1)th switching period. [Figure 29] FIG. 11 is a schematic diagram illustrating an example of another configuration of a projection device according to an embodiment of the present disclosure. [Diagram 30] 4A to 4C are diagrams illustrating a first example of an operation mode of a light source device according to an embodiment of the present disclosure. [Diagram 31] 6A and 6B are diagrams illustrating a second example of an operation mode of the light source device according to the embodiment of the present disclosure. [Diagram 32] 13A and 13B are diagrams illustrating a third example of an operation mode of the light source device according to the embodiment of the present disclosure. [Diagram 33] 13A and 13B are schematic diagrams showing modified examples of the configuration for light incidence on a light transmitting member. [Figure 34A] FIG. 1 is a first diagram showing a preferred direction SV when measuring θ11, θ12, θ21, and θ22. [Figure 34B] FIG. 2 is a second diagram showing a preferred direction SV when measuring θ11, θ12, θ21, and θ22. [Figure 34C] FIG. 3 is a third diagram showing a preferred direction SV when measuring θ11, θ12, θ21, and θ22. [Fig. 34D] FIG. 4 is a diagram showing a preferred direction SV when measuring θ11, θ12, θ21, and θ22. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] A light source device and a projection device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, the following embodiments are merely examples of the light source device and the projection device for realizing the technical concept of the present embodiment, and are not limited to the following.

[0011] In addition, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments of the present disclosure are merely illustrative examples and are not intended to limit the scope of the present disclosure. Note that the sizes, positional relationships, etc. of components shown in each drawing may be exaggerated to clarify the explanation. In the following explanation, the same names and symbols indicate the same or similar components, and detailed explanations will be omitted as appropriate.

[0012] In each drawing, a Cartesian coordinate system having an X axis, a Y axis, and a Z axis may be used to express directions. The X axis, the Y axis, and the Z axis are mutually orthogonal. The side to which the arrow points in the X direction along the X axis is indicated as the +X side, and the opposite side of the +X side is indicated as the -X side. The side to which the arrow points in the Y direction along the Y axis is indicated as the +Y side, and the opposite side of the +Y side is indicated as the -Y side. The side to which the arrow points in the Z direction along the Z axis is indicated as the +Z side, and the opposite side of the +Z side is indicated as the -Z side. However, the terms indicating these specific directions and positions are merely used to make the relative directions and positions in the referenced drawings easier to understand. These terms do not limit the orientation of the light source device and the projection device according to the embodiment of the present disclosure when used, and the orientation of the light source device and the projection device according to the embodiment of the present disclosure when used is arbitrary.

[0013] In the embodiments of the present disclosure described below, "along the X-axis, Y-axis, and Z-axis" includes an object having a tilt within a range of ±10 degrees with respect to these axes. In the embodiments of the present disclosure, each of the perpendicular and perpendicular directions may have an error within ±10 degrees with respect to 90 degrees.

[0014] [First embodiment] <Example of Overall Configuration of Light Source Device 100> FIG. 1 is a schematic diagram showing an example of the configuration of a light source device 100 according to a first embodiment of the present disclosure.

[0015] 1, the light source device 100 has a first light source section 1 capable of emitting a first light L1 from one or more first light-emitting sections 10, and a second light source section 2 capable of emitting a second light L2 from one or more second light-emitting sections 20. The light source device 100 also has a light-transmitting member 3 that transmits the incident first light L1 and second light L2, and a drive section 4 that can drive the one or more first light-emitting sections 10 and the one or more second light-emitting sections 20 individually.

[0016] The light source device 100 can irradiate the first light L1 and the second light L2 transmitted through the light transmitting member 3. For example, the light transmitting member 3 is a light homogenizing element that transmits the first light L1 and the second light L2 to synthesize them and homogenize the illuminance of the emitted light. The light source device 100 can irradiate the light L whose illuminance has been homogenized by being transmitted through the light transmitting member 3. In the example shown in FIG. 1, the light source device 100 irradiates the light L such that the principal ray of the light L travels in the +Z direction. In this specification, the principal ray refers to a ray that travels on and along the central axis of the light beam among the rays contained in the beam.

[0017] The driving unit 4 can individually reduce the amount of the first light L1 emitted from each of the one or more first light-emitting units 10 and the second light L2 emitted from each of the one or more second light-emitting units 20, or individually turn off the one or more first light-emitting units 10 and the one or more second light-emitting units 20. When the light-transmitting member 3 is viewed from a direction perpendicular to the central axis 30 of the light-transmitting member 3 (for example, from the upper side of the light source device 100, which is the +Y side), the first light L1 is incident on the light-transmitting member 3 at a positive angle with respect to the central axis 30. When the light-transmitting member 3 is viewed from a direction perpendicular to the central axis 30 of the light-transmitting member 3, the second light L2 is incident on the light-transmitting member 3 at a negative angle with respect to the central axis 30. Among the "directions perpendicular to the central axis 30 of the light transmitting member 3", it is preferable that the above relationship is satisfied when viewed from a direction (SV) that symmetrically divides a direction (PL1) perpendicular to the central axis 30 of the light transmitting member 3 and perpendicular to a line connecting the starting point (L1S) of the first light (principal ray) that goes directly to the light transmitting member 3 and the point (L1E) where the first light enters the light transmitting member 3, and a direction (PL2) perpendicular to the central axis 30 of the light transmitting member 3 and perpendicular to a line connecting the starting point (L2S) of the second light (principal ray) that goes directly to the light transmitting member 3 and the point (L2E) where the second light enters the light transmitting member 3, as shown in Figures 34A to 34D (all of which are views from the Z direction in Figure 1). Note that when PL1 and PL2 are parallel, SV is also parallel to PL1 and PL2.

[0018] In the example shown in FIG. 1, the first light source unit 1 has two first light emitting units 10 including a first small angle light emitting unit 11 and a first large angle light emitting unit 12. The first small angle light emitting unit 11 and the first large angle light emitting unit 12 are aligned along the X-axis. The chief ray of the first small angle light L11 emitted from the first small angle light emitting unit 11 passes through the light incident surface 31 and is incident on the light transmitting member 3 at a first small angle θ11 with respect to the central axis 30. The chief ray of the first large angle light L12 emitted from the first large angle light emitting unit 12 passes through the light incident surface 31 and is incident on the light transmitting member 3 at a first large angle θ12 with respect to the central axis 30. Both the first small angle θ11 and the first large angle θ12 are positive angles. On the other hand, the second light source unit 2 has two second light emitting units 20 including a second small angle light emitting unit 21 and a second large angle light emitting unit 22. The first small angle light emitting unit 11 and the first large angle light emitting unit 12 are aligned along the X-axis. The chief ray of the second small angle light L21 emitted from the second small angle light emitting unit 21 passes through the light incident surface 31 and is incident on the light transmitting member 3 at a second small angle θ21 with respect to the central axis 30. The chief ray of the second large angle light L22 emitted from the second large angle light emitting unit 22 passes through the light incident surface 31 and is incident on the light transmitting member 3 at a second large angle θ22 with respect to the central axis 30. The second small angle θ21 and the second large angle θ22 are both negative angles. In the light source device 100, the second light L2 including the second small angle light L21 and the second large angle light L22 is incident on the light transmitting member 3 at a negative angle θ21 or a negative angle θ22 with respect to the central axis 30.

[0019] In addition, in Fig. 1, the light emitted from the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 is described as a chief ray, but in reality, each light-emitting unit emits a bundle of light rays with a finite spread. Light other than the chief ray that is not depicted in this description, such as peripheral light rays, has a spread, and in some cases, the peripheral light may cross the central axis 30 of the light-transmitting member 3. The present invention refers to the chief ray or light with the strongest emission angle because the incidence angle of the chief ray of the light-emitting unit into the light-transmitting member 3 has a large effect on the unevenness of the illumination. There is no restriction on the angle of light intensity emitted from each light-emitting unit other than the peripheral light, which is usually weaker than the center.

[0020] In the light source device 100, the driving unit 4 can individually reduce the light amount of one or more first light L1 and one or more second light L2, or individually turn off one or more first light-emitting units 10 and one or more second light-emitting units 20. As a result, the light-emitting time of each of the one or more first light-emitting units 10 and one or more second light-emitting units 20 can be shortened or the emitted light amount can be reduced, compared to a case in which the first light L1 is constantly emitted from each of the one or more first light-emitting units 10 without reducing the light amount, and the second light L2 is constantly emitted from each of the one or more second light-emitting units 20 without reducing the light amount. Note that the average illuminance of the light L irradiated from the light source device 100 in a case in which the first light L1 is constantly emitted from each of the one or more first light-emitting units 10 without reducing the light amount, and the second light L2 is constantly emitted from each of the one or more second light-emitting units 20 without reducing the light amount corresponds to a predetermined illuminance.

[0021] In the light source device 100, by at least one of shortening the light emission time and reducing the amount of emitted light, the illuminance of the light irradiated from the light source device 100 can be made lower than a predetermined illuminance, thereby extending the lifespan of each of the one or more first light-emitting sections 10 and the one or more second light-emitting sections 20. This allows the lifespan of the light source device 100 to be extended.

[0022] On the other hand, when the light amount of one or more first lights L1 and one or more second lights L2 is individually reduced, or when one or more first light-emitting units 10 and one or more second light-emitting units 20 are individually turned off, the anisotropy of the angle of the first light L1 and one or more second lights L2 incident on the light-transmitting member 3 with respect to the central axis 30 may become large. The anisotropy of the angle with respect to the central axis 30 corresponds to, for example, a case where the first light L1 and one or more second lights L2 are both incident on the light-transmitting member 3 at a positive angle with respect to the central axis 30. Such anisotropy may cause uneven illuminance in the irradiated light L. In the light source device 100, the first light L1 is incident on the light-transmitting member 3 at a positive angle with respect to the central axis 30, and the second light L2 is incident on the light-transmitting member 3 at a negative angle with respect to the central axis 30. As a result, in the light source device 100, the anisotropy of the angles of incidence of the first light L1 and the second light L2 with respect to the central axis 30 can be reduced, and unevenness in the illuminance of the light L can be reduced.

[0023] As described above, in this embodiment, when the illuminance of the light irradiated from the light source device 100 is lower than a predetermined illuminance, the illuminance unevenness can be reduced. Here, the angle of the first light L1 with respect to the central axis 30 is, for example, the angle of the principal ray of the first light L1 with respect to the central axis 30. Also, the angle of the second light L2 with respect to the central axis 30 is, for example, the angle of the principal ray of the second light L2 with respect to the central axis 30. If at least the principal ray of the first light L1 is incident on the light transmitting member 3 at a positive angle with respect to the central axis 30, and at least the principal ray of the second light L2 is incident on the light transmitting member 3 at a negative angle with respect to the central axis 30, and is not incident at a positive angle, the effect of reducing the illuminance unevenness of the light L can be obtained. 1 shows an example in which the first light L1 forms a positive angle with respect to the central axis 30 and the second light L2 forms a negative angle with respect to the central axis 30, but the first light L1 may form a negative angle with respect to the central axis 30 and the second light L2 may form a positive angle with respect to the central axis 30. The direction perpendicular to the central axis 30 of the light transmitting member 3 is not limited to the +Y side shown in FIG. 1, and may be any direction perpendicular to the central axis 30.

[0024] In the example shown in FIG. 1, the light source device 100 has a control unit 5 that controls the operation of the drive unit 4. The control unit 5 has a light emission control unit described in FIG. 3. The light emission control unit can individually reduce the amount of the first light L1 emitted from each of the one or more first light emitters 10 and the second light L2 emitted from each of the one or more second light emitters 20, or can individually control the one or more first light emitters 10 and the one or more second light emitters 20 to be turned off. In addition, the control unit 5 can control the second light L2 to be incident on the light transmitting member 3 at a negative angle with respect to the central axis 30 when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30 of the light transmitting member 3. By having such a control unit 5, the light source device 100 can reduce illuminance unevenness when the illuminance of the light L irradiated from the light source device 100 is lowered below a predetermined illuminance.

[0025] Furthermore, in the light source device 100, the first light source unit 1 and the second light source unit 2 can be alternately turned on. By alternately turning on the first light source unit 1 and the second light source unit 2, the life of the light source device 100 can be extended. At any given moment, only one of the first light source unit 1 and the second light source unit 2 is not turned on, but it is preferable to alternately turn on the first light source unit 1 and the second light source unit 2 within a time range that can be considered simultaneous within the time period during which a person views the light.

[0026] The interval (switching cycle) at which the first light source unit 1 and the second light source unit 2 are alternately turned on is preferably a time equivalent to one frame of 24 to 50 fps (frames per second) used in image generation, for example.

[0027] In addition, in the light source device 100, even if the first light source unit 1 and the second light source unit 2 have inherent illuminance unevenness, if the inherent illuminance unevenness of each is sufficiently small, it can be performed so that it is not noticeable even if the switching period is not instantaneous, but is long, such as every start or every day. In general, it is said that illuminance unevenness is visible to the naked eye when there is a deviation of 50%, and is not noticeable unless it drops to about 30%. Furthermore, if the illuminance unevenness of each of the first light source unit and the second light source unit 2 can be suppressed to 10% or less, even if the first light source unit 1 and the second light source unit 2 are driven independently, there will be no sense of discomfort regarding the illuminance unevenness. In other words, if the difference in illuminance unevenness between the first light source unit 1 and the second light source unit 2 is small, the switching period may be set to be independent of the switching period.

[0028] The light source device 100 is not limited to alternately turning on the first light source unit 1 and the second light source unit 2, but can also turn on the first light source unit 1 and the second light source unit 2 simultaneously. By turning on the first light source unit 1 and the second light source unit 2 simultaneously, the light source device 100 can also reduce unevenness in the illuminance of the light L irradiated from the light source device 100.

[0029] In addition, in the light source device 100, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the first small angle light L11 relative to the central axis 30 is smaller than the absolute value of the angle of the chief ray of the first large angle light L12 relative to the central axis 30. Moreover, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the second small angle light L21 relative to the central axis 30 is smaller than the absolute value of the angle of the chief ray of the second large angle light L22 relative to the central axis 30. As a result, the angle difference between the first light L1 and the second light L2 can be reduced, and therefore uneven illuminance of the light L irradiated from the light source device 100 can be reduced.

[0030] In the light source device 100, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the first small angle light L11 relative to the central axis 30 is equal to the absolute value of the angle of the chief ray of the second small angle light L21 relative to the central axis 30. Moreover, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the first large angle light L12 relative to the central axis 30 is equal to the absolute value of the angle of the chief ray of the second large angle light L22 relative to the central axis 30. As a result, the light amounts of the first light L1 and the second light L2 can be made substantially equal, so that unevenness in the illuminance of the light L irradiated from the light source device 100 can be reduced.

[0031] In the light source device 100, the first small-angle light-emitting unit 11 and the second small-angle light-emitting unit 21 form a first group G1. The first large-angle light-emitting unit 12 and the second large-angle light-emitting unit 22 form a second group G2. The driving unit 4 alternately turns off the first group G1 and the second group G2, or alternately reduces the amount of light of the first light L1 from the first group G1 and the amount of light of the second light L2 from the second group G2. This makes it possible to reduce the amount of light of the first light L1 and the second light L2 while keeping them almost equal, thereby reducing illuminance unevenness when the illuminance of the light L irradiated from the light source device 100 is lowered below a predetermined illuminance.

[0032] In addition, in the light source device 100, the driving unit 4 alternately turns off the first set G1 and the second set G2, or alternately reduces the amount of light of the first light L1 from the first set G1 and the amount of light of the second light L2 from the second set G2, in a predetermined switching cycle. As a result, the amount of light of the first light L1 and the second light L2 can be reduced while being approximately equal in various predetermined cycles. For example, by shortening the switching cycle so that the human eye cannot detect it, the switching between the first set G1 and the second set G2 can be performed inconspicuously. Alternatively, by switching between the first set G1 and the second set G2 every time the light source device 100 is started, the switching between the first set G1 and the second set G2 can be performed inconspicuously. As a result, the life of the light source device 100 can be extended, and the illuminance unevenness of the light L irradiated from the light source device 100 can be reduced inconspicuously.

[0033] Moreover, in the light source device 100, each of the first light-emitting unit 10 and the second light-emitting unit 20 can include at least one of a light-emitting diode element (LED: Light Emitting Diode) and a semiconductor laser element (LD: Laser Diode). With this configuration, the light source device 100 can quickly control the first light-emitting unit 10 and the second light-emitting unit 20 to be turned on or off or to change the amount of light. Furthermore, since each of the first light-emitting unit 10 and the second light-emitting unit 20 includes a semiconductor laser element, the amount of light L irradiated from the light source device 100 can be increased.

[0034] In the example shown in FIG. 1, the first light source unit 1 has a first light guide optical system 13 that guides the first light L1 emitted from one or more first light emitters 10 to the light transmitting member 3. The first light guide optical system 13 has a first lens 131, a second lens 132, a third lens 133, a fourth lens 134, and a fifth lens 135. The second light source unit 2 has a second light guide optical system 23 that guides the second light L2 emitted from one or more second light emitters 20 to the light transmitting member 3. The second light guide optical system 23 has a sixth lens 231, a seventh lens 232, an eighth lens 233, a ninth lens 234, and a tenth lens 235. The lenses included in each of the first light guide optical system 13 and the second light guide optical system 23 can be configured to include glass or resin having translucency. The light transmissivity in this specification preferably has a transmittance of 60% or more for the first light L1 and the second light L2. The type, shape, arrangement, number, etc. of the lenses included in the first light guiding optical system 13 and the second light guiding optical system 23 can be changed as appropriate. Furthermore, the first light guiding optical system 13 and the second light guiding optical system 23 may include various optical elements such as mirrors, diffraction elements, MEMS (Micro Electro Mechanical Systems), optical fibers, etc. in addition to lenses. The number and arrangement of the optical elements included in the first light guiding optical system 13 and the second light guiding optical system 23 can also be changed as appropriate.

[0035] The light transmitting member 3 may be a light homogenizing element such as a rod integrator. The light transmitting member 3 may be made of a resin or glass having translucency. The light transmitting member 3 is not limited to a light homogenizing element as long as it can transmit the first light L1 and the second light L2. Even if the light transmitting member 3 is not a light homogenizing element, in the light source device 100, when the illuminance of the light L irradiated from the light source device 100 is lowered below a predetermined illuminance, the illuminance unevenness can be reduced compared to the case where the embodiment of the present disclosure is not applied. The light transmitting member 3 is not necessarily limited to a transmitting medium (translucent resin or glass) through which light passes. For example, the light transmitting member 3 may be a hollow so-called light tunnel in which four plane mirrors are combined so that the entrance opening shape and the exit opening shape are rectangular, and the light homogenizing effect is obtained by repeating reflection and total reflection on the mirror surface of the plane mirror.

[0036] The drive unit 4 is composed of an electric circuit and the like. The operation unit 6 can receive operations by an operator on the light source device 100. The operation unit 6 can be composed of, for example, a touch panel, a button, a keyboard, and the like. The operation unit 6 may be integrated with a display unit. The light source device 100 may also have a housing that houses the first light source unit 1, the second light source unit 2, the light transmitting member 3, and the like. The drive unit 4 and the control unit 5 may be housed in the housing.

[0037] <Configuration example of control unit 5> (Hardware configuration) 2 is a block diagram showing an example of a hardware configuration of the control unit 5. The control unit 5 has a CPU (Central Processing Unit) 51, a ROM (Read Only Memory) 52, a RAM (Random Access Memory) 53, a HDD (Hard Disk Drive) / SSD (Solid State Drive) 54, and an I / F (Interface) 55. These are connected to each other via a system bus B so as to be able to communicate with each other.

[0038] The CPU 51 executes control processing including various kinds of arithmetic processing. The ROM 52 is a non-volatile memory that stores programs used to drive the CPU 51, such as an IPL (Initial Program Loader). The RAM 53 is a volatile memory used as a work area for the CPU 51. The HDD / SSD 54 is a non-volatile memory that can store various information, programs, etc. used for control by the control unit 5.

[0039] The I / F 55 is an interface for communicating between the control unit 5 and a device or apparatus other than the control unit 5. The I / F 55 can also communicate with a device or apparatus other than the control unit 5 via a network or the like. The devices other than the control unit 5 include the drive unit 4 and the operation unit 6. The devices other than the control unit 5 include an external PC (Personal Computer), an external server, etc.

[0040] (Functional configuration) The functional configuration of the control unit 5 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 is a block diagram showing an example of the functional configuration of the control unit 5. Fig. 4 is a diagram showing an example of correspondence information 511 used by the control unit 5.

[0041] As shown in FIG. 3, the control unit 5 includes a reception unit 501 , a light emission information acquisition unit 502 , a storage unit 503 , a switching condition acquisition unit 504 , a light emission control unit 505 , and an output unit 506 .

[0042] Each function of the reception unit 501 and the output unit 506 is realized by the I / F 55, etc. Note that some of the functions of the reception unit 501 and the output unit 506 may be realized by a processor such as the CPU 51 executing processing defined in a program stored in the ROM 52, etc. The function of the storage unit 503 is realized by the RAM 53, the HDD / SSD 54, etc. Each function of the light emission information acquisition unit 502, the switching condition acquisition unit 504, and the light emission control unit 505 is realized by a processor such as the CPU 51 executing processing defined in a program stored in the ROM 52, etc.

[0043] Each function of the control unit 5 can also be realized by one or more processing circuits. The "processing circuit" here includes devices such as an ASIC (Application Specific Integrated Circuit), a DSP (digital signal processor), and conventional circuit modules designed to execute each function described above. Some of the functions of the control unit 5 can also be realized by external devices such as an external PC or an external server communicably connected to the control unit 5. Some of the functions of the control unit 5 can also be realized by distributed processing between the control unit 5 and these external devices.

[0044] The reception unit 501 controls communication with the operation unit 6 to receive operation mode information Md of the light source device 100 selected by the operator using the operation unit 6, lighting pattern information Pt, and switching conditions between the first light-emitting unit 10 and the second light-emitting unit 20, etc.

[0045] The light emission information acquisition unit 502 acquires light emission information C1 based on the operation mode information Md and the lighting pattern information Pt obtained from the reception unit 501, with reference to the correspondence information 511 stored in the storage unit 503.

[0046] The switching condition acquisition unit 504 acquires the switching condition C2 via the reception unit 501 and provides it to the light emission control unit 505 .

[0047] The light emission control unit 505 controls the driving of each of the one or more first light-emitting units 10 and one or more second light-emitting units 20 by the drive unit 4. The light emission control unit 505 can control the light emission driving of each of the one or more first light-emitting units 10 and one or more second light-emitting units 20 by the drive unit 4 based on the light emission information C1 and the switching condition C2.

[0048] The output unit 506 controls the communication between the control unit 5 and the drive unit 4 in response to a command from the light emission control unit 505 .

[0049] As shown in FIG. 4, the correspondence information 511 is information that predetermines the correspondence relationship between the operation mode information Md, the lighting pattern information Pt, and the light emission information C1. The operation modes include a full-light mode, a double-life mode, a quadruple-life mode, and an eight-times-life mode. Items for each operation mode include a lighting pattern, a light intensity ratio at full light, the output of each of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 in the first light-emitting unit 10, the output of each of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22 in the second light-emitting unit 20, and the illuminance uniformity of the light L. The light intensity ratio at full light is displayed as a percentage. The output is displayed as a ratio. In Table 4, a blank in the column showing the output of each of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 means that the light-emitting unit is turned off or the light intensity is reduced. 4 shows the evaluation results of the uniformity for each operation mode, and is not information used in controlling the first light-emitting unit 10 and the second light-emitting unit 20. The uniformity includes "best" which is the best, "better" which is inferior to "best", and "slightly inferior" which is inferior to "better".

[0050] The full light mode is an operating mode in which one or more first light-emitting units 10 and one or more second light-emitting units 20 are all turned on. The lighting pattern in the full light mode is the full light pattern, and the light intensity ratio when fully lit is 100%. The output of each of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 is 1.00. The illuminance uniformity is "best".

[0051] The double life mode is an operation mode in which the life of the light source device 100 is approximately doubled compared to the full light mode by individually reducing the light amount of one or more first lights L1 and one or more second lights L2, or individually turning off one or more first light-emitting units 10 and one or more second light-emitting units 20. The lighting patterns in the double life mode include first to fifth patterns, each of which includes pattern A and pattern B. Each pattern is a combination of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 in which the full light ratio of the light amount is 50%. In the first and second patterns, the sum of the light amounts of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 is approximately equal to the sum of the light amounts of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22, so that the uniformity of the illuminance is "best". In the third and fourth patterns, the uniformity of illuminance is "better" because the sum of the light amounts of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 and the sum of the light amounts of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22 are not equal. In the fifth pattern, the uniformity is "slightly worse" because either the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12, or the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22 are turned on and the other is turned off.

[0052] The 4x life mode is an operation mode in which the life of the light source device 100 is approximately four times longer than that in the full-light mode by individually reducing the light amount of one or more first lights L1 and one or more second lights L2, or individually turning off one or more first light-emitting units 10 and one or more second light-emitting units 20. There is a sixth lighting pattern in the 4x life mode. The sixth pattern includes patterns A and B. The sixth pattern includes patterns A and B, which are combinations of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 in which the full-light ratio of the light amount is 25%. In the sixth pattern, the sum of the light amounts of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 is approximately equal to the sum of the light amounts of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22, so that the uniformity of the illuminance is "best".

[0053] The eight times life mode is an operation mode in which the life of the light source device 100 is increased by approximately eight times compared to the full light mode by individually reducing the light amount of one or more first lights L1 and one or more second lights L2, or individually turning off one or more first light-emitting units 10 and one or more second light-emitting units 20. The lighting pattern of the eight times life mode includes a seventh pattern. The seventh pattern includes a pattern A and a pattern B. The seventh pattern includes a combination of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 in which the full light ratio of the light amount is 12.5%. In the seventh pattern, the sum of the light amounts of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 is approximately equal to the sum of the light amounts of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22, so that the uniformity of the illuminance is "best".

[0054] 1, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the first light L1 emitted from the first small-angle light-emitting unit 11 and incident on the light transmitting member 3 relative to the central axis 30 is equal to the absolute value of the angle of the chief ray of the second light L2 emitted from the second small-angle light-emitting unit 21 and incident on the light transmitting member 3 relative to the central axis 30. Also, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30, the absolute value of the angle of the chief ray of the first light L1 emitted from the first large-angle light-emitting unit 12 and transmitted through the light transmitting member 3 relative to the central axis 30 is equal to the absolute value of the angle of the chief ray of the second light L2 emitted from the second large-angle light-emitting unit 22 and incident on the light transmitting member 3 relative to the central axis 30.

[0055] In addition, in the first to fourth patterns, the sixth pattern, and the seventh pattern in Fig. 4, the pattern A corresponding to the first set G1 and the pattern B corresponding to the second set G2 can be alternately performed. This allows the first set G1 and the second set G2 to be alternately turned off, or the light amount of the first light L1 from the first set G1 and the light amount of the second light L2 from the second set G2 to be alternately reduced in Fig. 1.

[0056] In addition, in the fifth pattern in Fig. 4, when the light transmitting member 3 is viewed from a direction perpendicular to the central axis 30 in Fig. 1, a state in which both the first light L1 and the second light L2 are incident on the light transmitting member 3 at a positive angle with respect to the central axis 30 and a state in which both the first light L1 and the second light L2 are incident on the light transmitting member 3 at a negative angle with respect to the central axis 30 can be alternately switched at a predetermined switching period. For example, by shortening the switching period so that the human eye cannot detect it, the above switching can be made inconspicuous. As a result, by lowering the illuminance below a predetermined illuminance, the life of the light source device 100 can be extended, while the illuminance unevenness of the light L irradiated from the light source device 100 can be reduced inconspicuously.

[0057] The light source device 100 can perform the switching for alternately switching between the first set G1 and the second set G2 every time the light source device 100 is started. However, without being limited thereto, the switching may be performed every predetermined number of times the light source device 100 is started, or may be performed every predetermined time, every predetermined number of days, every predetermined accumulated lighting time, or the like. These switching conditions are selected by the operator using the operation unit 6, for example. The control unit 5 can obtain the selection result of the switching condition by the reception unit 501 and set it.

[0058] The predetermined switching cycle may be determined by providing a storage device as part of the control unit 5 in the light source device 100 or separately, and recording switching cycle information in the storage device in advance. The switching cycle information may be read at each startup and started based on the information. The switching cycle may be determined by recording information on the lighting time and lighting drive conditions (current, temperature, etc.) of each light-emitting unit and deriving the cumulative lighting from the information. The information on the lighting time and lighting drive conditions (current, temperature, etc.) of each light-emitting unit may be made accessible remotely, and the switching cycle information may be rewritable from the outside. The program for calculating the switching information may be updated. Furthermore, if the driving information of the light source is read and an abnormality of the light source is determined based on the driving information according to a predetermined judgment criterion, the driving of the light source may be controlled to minimize uneven illuminance and changes in chromaticity coordinates.

[0059] <Example of processing by the control unit 5> Fig. 5 is a flowchart showing an example of processing by the control unit 5. Fig. 5 shows processing by the control unit 5 for accepting a selection operation of an operation mode different from a certain operation mode when the light source device 100 is operating in the certain operation mode, and changing the operation mode in response to the selection operation.

[0060] First, in step S11, the control unit 5 determines through the reception unit 501 whether the operation mode information Md of the light source device 100 selected by the operator via the operation unit 6, the lighting pattern information Pt, and the switching condition C2 have been received.

[0061] In step S11, if it is determined that the request has not been accepted (step S11, NO), the control unit 5 performs the process of step S11 again. On the other hand, in step S11, if it is determined that the request has been accepted (step S11, YES), the control unit 5 performs the process of step S12.

[0062] In step S12, the control unit 5 acquires the light emission information C1 by the light emission information acquisition unit 502, with reference to the correspondence information 511 stored in the storage unit 503, based on the operation mode information Md and the lighting pattern information Pt obtained from the reception unit 501. The light emission information acquisition unit 502 provides the light emission information C1 to the control unit 5.

[0063] Next, in step S13, the control unit 5 provides the switching condition C2 acquired via the reception unit 501 to the light emission control unit 505 by the switching condition acquisition unit 504.

[0064] In step S14, the control unit 5 controls the light emission drive of each of the one or more first light-emitting units 10 and the one or more second light-emitting units 20 by the drive unit 4, using the light emission control unit 505, based on the light-emitting information C1 and the switching condition C2.

[0065] In this manner, while the control unit 5 is operating in a certain operation mode, the control unit 5 can accept a selection operation for a different operation mode from the certain operation mode, and execute a process for changing the operation mode in response to the selection operation.

[0066] [Second embodiment] Next, a light source device according to a second embodiment will be described. Note that the same names and symbols as those in the embodiments of the present disclosure already described indicate the same or similar members or configurations, and detailed descriptions will be omitted as appropriate. This also applies to the embodiments and modified examples of the present disclosure described below.

[0067] The configuration of a light source device according to a second embodiment of the present disclosure will be described with reference to Fig. 6 to Fig. 8. Fig. 6 is a schematic diagram showing an example of the configuration of a light source device 100a according to a second embodiment of the present disclosure. Fig. 7 is a schematic plan view showing a wavelength conversion element 91 included in the light source device 100a. Fig. 8 is a schematic plan view showing a color wheel 92 included in the light source device 100a.

[0068] The light source device 100a includes a wavelength conversion region 911 and a light reflection region 912, and has a rotatable wavelength conversion element 91. In the light source device 100a, the first light emitting unit 10 emits a first blue light L1, and the second light emitting unit 20 emits a second blue light L2. The wavelength conversion element 91 can emit wavelength converted light Ln by receiving the first light L1 and the second light L2 in the wavelength conversion region 911, and can emit blue reflected light Lb by receiving the first light L1 and the second light L2 in the light reflection region 912. The wavelength converted light Ln and the blue reflected light Lb emitted from the wavelength conversion element 91 are incident on the light transmitting member 3 through a color wheel 92 or the like. The light source device 100a can alternately irradiate the wavelength converted light Ln and the blue reflected light Lb from the light transmitting member 3 by rotating the wavelength conversion element 91. The above points are mainly different from the first embodiment described above. The light source device 100a is capable of irradiating wavelength-converted light Ln and reflected blue light Lb alternately from the light transmitting member 3 to the +Z side.

[0069] In the light source device 100a, in a configuration capable of alternately emitting wavelength-converted light Ln and blue reflected light Lb, when the illuminance of the light L emitted from the light source device 100 is made lower than a predetermined illuminance, illuminance unevenness can be reduced.

[0070] 6, each of the first light-emitting section 10 and the second light-emitting section 20 is a unit in which light-emitting sections are two-dimensionally arranged, such as 2 × 7 or 4 × 7. The first light L1 from the first light-emitting section 10 and the second light L2 from the second light-emitting section 20 are each in the blue wavelength band of 405 nm or more and 430 mm or less.

[0071] In the example shown in FIG. 6, the light source device 100a includes a light guide optical system 7, a dichroic mirror 81, and a color wheel 92. The light guide optical system 7 guides the first blue light L1 from the first light emitter 10 and the second blue light L2 from the second light emitter 20 to the light transmitting member 3. The light guide optical system 7 includes an eleventh lens 71, a twelfth lens 72, a thirteenth lens 73, a fourteenth lens 74, a fifteenth lens 75, a sixteenth lens 76, and a seventeenth lens 77. The eleventh lens 71 and the fourteenth lens 74 are lens arrays. The fifteenth lens 75 and the sixteenth lens 76 focus the first light L1 and the second light L2 on the +Z side surface of the wavelength conversion element 91. The seventeenth lens 77 focuses the wavelength converted light Ln and the blue reflected light Lb on the light incident surface 31 of the light transmitting member 3. The optical elements included in the light-guiding optical system 7 can be made of glass, resin, or the like having light transmissivity. The type, shape, arrangement, number, and the like of the optical elements included in the light-guiding optical system 7 can be changed as appropriate. The dichroic mirror 81 reflects each of the first blue light L1 and the second blue light L2 in the direction in which the wavelength conversion element 91 is located, and transmits the wavelength-converted light Ln and blue reflected light Lb emitted from the wavelength conversion element 91. The color wheel 92 transmits the wavelength-converted light Ln and blue reflected light Lb from the wavelength conversion element 91.

[0072] In the example shown in FIG. 7, the wavelength conversion element 91 is a plate-like member that is substantially circular when viewed from the +Z side. However, the shape of the wavelength conversion element 91 when viewed from the +Z side may be substantially rectangular, substantially elliptical, substantially polygonal, or the like. A wavelength conversion region 911 that forms a part of a circular ring and a sector-shaped light reflection region 912 are provided on the surface on the +Z side of the wavelength conversion element 91. The wavelength conversion region 911 includes a yellow fluorescent region 911a that can emit yellow fluorescence and a green fluorescent region 911b that can emit green fluorescence or yellow-green fluorescence. The light reflection region 912 specularly reflects the incident blue first light L1 and blue second light L2. However, the light reflection region 912 may diffusely reflect the incident blue first light L1 and blue second light L2. The beam spot Ls in FIG. 7 represents the beam spot of the first light L1 or the second light L2 that is incident on the light reflection region 912. The wavelength conversion element 91 can continuously change the position of each region by being rotated around the central axis of the plate-like member. The configuration of the wavelength conversion element 91 is not limited to that shown in Fig. 7 and can be changed as appropriate. For example, the wavelength conversion region 911 may be arranged in a fan shape, and the light reflection region 912 may be arranged in a circular ring shape.

[0073] In the example shown in FIG. 8, the color wheel 92 is a plate-like member that is substantially circular when viewed from the +Z side. However, the shape of the color wheel 92 when viewed from the +Z side may be substantially rectangular, substantially elliptical, substantially polygonal, or the like. A fan-shaped red filter region 921, a fan-shaped yellow transmission region 922, a fan-shaped blue diffusion region 923, and a fan-shaped green filter region 924 are provided on the surface on the +Z side of the color wheel 92. The red filter region 921 transmits red light and absorbs other light. The yellow transmission region 922 transmits red light. The blue diffusion region 923 diffuses and transmits the incident blue reflected light Lb. The green filter region 924 transmits green light and absorbs other light. The green filter region 924 may be a green transmission region that transmits green light. The color wheel 92 is driven to rotate around the central axis of the plate-like member, so that the positions of each region can be continuously changed. The configuration of the color wheel 92 is not limited to that shown in Fig. 8 and can be changed as appropriate. For example, the red filter region 921, the yellow transmission region 922, the blue diffusion region 923, and the green filter region 924 may be arranged in a circular ring shape, or other color regions may be added.

[0074] <Characteristics of wavelength conversion region 911> Next, the characteristics of the wavelength conversion region 911 will be described. Fig. 9 is a diagram showing the relationship between the output of the excitation light and the output of the wavelength conversion light Ln in the light source device 100a. The horizontal axis of Fig. 9 represents the output of the excitation light. The excitation light corresponds to at least one of the first light L1 emitted from the first light-emitting unit 10 and incident on the wavelength conversion region 911, and the second light L2 emitted from the second light-emitting unit 20 and incident on the wavelength conversion region 911. The vertical axis of Fig. 9 represents the output of the wavelength conversion light Ln.

[0075] Here, for example, in a light source device using a wavelength conversion element, when the output of the excitation light increases, the conversion efficiency of the wavelength conversion element decreases due to an increase in temperature of the wavelength conversion element into which the excitation light is incident, and the output of the wavelength-converted light emitted from the wavelength conversion element decreases. In other words, even if the output of the excitation light is halved, the output of the wavelength-converted light does not become half, and may become larger than half the output of the excitation light. As a result, the chromaticity coordinates and color temperature of the light irradiated from the light source device change from the desired chromaticity coordinates and color temperature.

[0076] In the light source device 100a, the first light L1 and the second light L2, which are excitation light, are light of a first wavelength band. The wavelength conversion element 91 receives the first light L1 and the second light L2, and emits light of a second wavelength band different from the first wavelength band. If the period during which the light source device 100a irradiates light of the first wavelength band without passing through the wavelength conversion element 91 is t1, and the period during which the light source device 100a irradiates light of the second wavelength band from the wavelength conversion element 91 is t2, the periods t1 and t2 are set independently in consideration of color balance. The light source device 100a has a first mode in which the light of the first wavelength band irradiated in the period t1 and the light of the second wavelength band irradiated in the period t2 are irradiated in at least a part of the wavelength band, respectively, or the light of the first output is irradiated by combining at least a part of the periods t1 and t2, and a second mode in which the light of the second output is irradiated in a different manner from the light of the first output. In the first mode, the output of the first light source unit required to obtain light of the first wavelength band is M1_PLD1, and the output of the first light-emitting unit 10 or the second light-emitting unit 20 required to obtain light of the second wavelength band is M1_PLD2. The ratio of the output M1_PLD1 to the output M1_PLD2 is η1. In the second mode, the output of the first light-emitting unit 10 or the second light-emitting unit 20 required to obtain light of the first wavelength band is M2_PLD1, and in the second mode, the output of the first light-emitting unit 10 or the second light-emitting unit 20 required to obtain light of the second wavelength band is M2_PLD2, and the ratio of the output M2_PLD1 to the output M2_PLD2 is η2, where η1 and η2 are different. As a result, in the light source device 100a, for example, when the output of the excitation light is halved, the output of the wavelength-converted light Ln can be halved. 9, when the output of the excitation light is changed from output M1_PLD1 or output M1_PLD2 to output M2_PLD1, the output Ph_P2 of the wavelength-converted light Ln when the excitation light is output M2_PLD1 can be reduced to approximately half of the output Ph_P1 of the wavelength-converted light Ln when the excitation light is output M2_PLD1. As a result, even when the temperature of the wavelength conversion element 91 rises, the change in the chromaticity coordinates and color temperature of the light L irradiated from the light source device 100a can be reduced, and the desired chromaticity coordinates and color temperature can be obtained.

[0077] In the light source device 100a, the ratio between the output of the light in the first wavelength band incident on the wavelength conversion element 91 and the output of the light in the second wavelength band emitted by the wavelength conversion element 91 upon receiving the light in the first wavelength band becomes smaller as the output of the light in the first wavelength band becomes larger. As a result, in the light source device 100a, even when the temperature of the wavelength conversion element 91 rises, it is possible to reduce changes in the chromaticity coordinates and color temperature of the light L irradiated from the light source device 100a and obtain the desired chromaticity coordinates and color temperature.

[0078] Fig. 10 is a timing chart showing the output of excitation light in the first mode of the light source device 100a. Fig. 11 is a timing chart showing the output of wavelength-converted light Ln in the first mode of the light source device 100a. In Figs. 10 and 11, "frame" represents a predetermined frame period, "1frame" represents the first frame period, "2frame" represents the second frame period, and "3rrame" represents the third frame period. In Fig. 11, output 111b represents the blue light output, output 111y represents the yellow light output, output 111r represents the red light output, and output 111g represents the green light output.

[0079] In Figures 10 and 11, the output M1_PLD1 of the excitation light source required to obtain light including a first wavelength region in a first mode, the output M1_PLD2 of the excitation light required to obtain light including a second wavelength band, and the ratio η1 (=M1_PLD1 / M1_PLD2) are defined.

[0080] On the other hand, Fig. 12 is a timing chart showing the output of the excitation light in the second mode of the light source device 100a Fig. 13 is a timing chart showing the output of the converted wavelength light Ln in the second mode of the light source device 100a.

[0081] In Figures 12 and 13, the output power M2_PLD1 of the pumping light required to obtain light including the first wavelength region in the second mode, the output power M2_PLD2 of the pumping light required to obtain light including the second wavelength band, and the ratio η2 (=M2_PLD1 / M2_PLD2) are defined.

[0082] In addition, in the light source device 100a, the amount of light emitted from the light source device 100a in the first mode is greater than the amount of light emitted from the light source device 100a in the second mode, and satisfies η1<η2. As a result, in the light source device 100a, even when the temperature of the wavelength conversion element 91 rises, the change in the chromaticity coordinates and color temperature of the light L emitted from the light source device 100a is reduced, and the desired chromaticity coordinates and color temperature can be obtained.

[0083] Furthermore, in the light source device 100a, light with a first chromaticity coordinate and color temperature is emitted in the first mode, and light with a second chromaticity coordinate and color temperature is emitted in the second mode, and the ratio η2 is determined so that the first chromaticity coordinate and color temperature are approximately equal to the second chromaticity coordinate and color temperature. As a result, in the light source device 100a, even if the conversion efficiency of the wavelength conversion element 91 changes due to a temperature rise or the like, the change in the chromaticity coordinate and color temperature of the light L emitted from the light source device 100a can be reduced, and the desired chromaticity coordinate and color temperature can be obtained.

[0084] The ratio η2 is set in the direction in which the first chromaticity coordinates and color temperature and the second chromaticity coordinates and color temperature become approximately the same. "Approximately the same" refers to the range in which the difference in chromaticity coordinates cannot be distinguished by the human eye. In general, when expressed in the coordinate distance of a uniform color space, the CIE1976 L*a*b* color space (CIELAB color space), ΔE*ab should be 3.0 or less. For products, 1.5 or less is even more desirable. When applied to devices that evaluate colors more strictly, 0.8 or less is even more desirable. The term "approximately" used here means that the standard is 3.0 or less, but that it can be determined appropriately depending on the specifications required by the product.

[0085] In addition, in the light source device 100a, the wavelength conversion element 91 can further emit light in a third wavelength band by receiving light in the second wavelength band, and the light source device 100a can also irradiate at least light in the first wavelength band and light in the third wavelength band. As a result, even when the temperature of the wavelength conversion element 91 rises, the light source device 100a can reduce changes in the chromaticity coordinates and color temperature of the light L irradiated from the light source device 100a, and can obtain the desired chromaticity coordinates and color temperature.

[0086] [Third embodiment] Next, a light source device according to a third embodiment will be described.

[0087] <Configuration of Light Source Device 100b> FIG. 14 is a schematic diagram showing an example of the configuration of a light source device 100b according to the third embodiment of the present disclosure.

[0088] The light source device 100b includes a wavelength conversion region 911 and a light reflection region 912, and has a rotatable first wavelength conversion element 91a and a second wavelength conversion element 91b. The first wavelength conversion element 91a and the second wavelength conversion element 91b have almost the same configuration. The first light emitting unit 10 emits a blue first light L1, and the second light emitting unit 20 emits a blue second light L2. The first wavelength conversion element 91a can emit wavelength-converted light Ln by receiving the first light L1 in the wavelength conversion region 911, and can emit blue reflected light Lb by receiving the first light L1 in the light reflection region 912. The second wavelength conversion element 91b can emit wavelength-converted light Ln by receiving the second light L2 in the wavelength conversion region 911, and can emit blue reflected light Lb by receiving the second light L2 in the light reflection region 912. The light source device 100b can alternately emit wavelength-converted light Ln and blue reflected light Lb from the light transmitting member 3 by rotating each of the first wavelength conversion element 91a and the second wavelength conversion element 91b. The light source device 100b mainly differs from the second embodiment in the above points.

[0089] In the light source device 100b, the light originating from the first light L1 and the second light L2 and incident on the light incident surface 31 of the light transmitting member 3 does not overlap on the light incident surface 31, so that the light originating from the first light L1 and the second light L2 can be incident on the light transmitting member 3 without loss. This can increase the extraction efficiency of the light L from the light transmitting member 3. Even in such a configuration of the light source device 100b, when the illuminance of the light L irradiated from the light source device 100 is made lower than a predetermined illuminance, illuminance unevenness can be reduced.

[0090] In the example shown in FIG. 14, the direction in which the first light-emitting unit 10 of the first light source unit 1 emits the first light L1 and the direction in which the second light-emitting unit 20 of the second light source unit 2 emits the second light L2 intersect. The first light-emitting unit 10 emits the first light L1 in the -X direction, and the second light-emitting unit 20 emits the second light L2 in the +Z direction. The first light-emitting unit 10 emits the first light L1 so that the main ray of the first light L1 travels in the -X direction, and the second light-emitting unit 20 emits the second light L2 so that the main ray of the second light L2 travels in the +Z direction. The -X direction and the +Z direction are almost perpendicular to each other. With this configuration, the distance between the first light-emitting unit 10 and the second light-emitting unit 20 can be reduced, and the space of the light source device 100b can be reduced. As a result, the light source device 100b can be made smaller.

[0091] 14, the light source device 100b has a reflection mirror 82. The first light source unit 1 has a third light guiding optical system 14 that guides the first light L1 emitted from one or more first light emitters 10 to the light transmitting member 3. The third light guiding optical system 14 has an eighteenth lens 141, a nineteenth lens 142, a twentieth lens 143, a first folding mirror 144, a twenty-first lens 145, a twenty-second lens 146, and a twenty-third lens 147. The second light source unit 2 has a fourth light guiding optical system 24 that guides the second light L2 emitted from one or more second light emitters 20 to the light transmitting member 3. The fourth light guiding optical system 24 has a 24th lens 241, a 25th lens 242, a 26th lens 243, a second folding mirror 244, a 27th lens 245, a 28th lens 246, and a 29th lens 247. The lenses included in each of the third light guiding optical system 14 and the fourth light guiding optical system 24 can be configured to include glass or resin having translucency. The type, shape, arrangement, number, etc. of the lenses included in the third light guiding optical system 14 and the fourth light guiding optical system 24 can be changed as appropriate. In addition, the third light guiding optical system 14 and the fourth light guiding optical system 24 may include various optical elements such as a diffraction element, MEMS, and optical fiber in addition to lenses and mirrors. The number and arrangement of the optical elements included in the third light guiding optical system 14 and the fourth light guiding optical system 24 can also be changed as appropriate.

[0092] 14, the first light L1 emitted from the first light source unit 1 passes near the reflecting mirror 82 and is directly incident on the light incident surface 31 of the light transmitting member 3. The second light L2 emitted from the second light source unit 2 is reflected by the reflecting mirror 82 and is incident on the light incident surface 31 of the light transmitting member 3. The light transmitting member 3 transmits the first light L1 and the second light L2 incident through the light incident surface 31, and can irradiate the light L.

[0093] In addition, in FIG. 14, a configuration is illustrated in which the first light L1 from the first light source unit 1 is not reflected by the reflecting mirror 82 but is directly guided to the light incident surface 31 of the light-transmitting member 3, and the second light L2 from the second light source unit 2 is reflected by the reflecting mirror 82 and guided to the light incident surface 31 of the light-transmitting member 3, but the configuration is not limited to this.

[0094] 33, the first light L1 from the first light source unit 1 and the second light L2 from the second light source unit 2 may be reflected by corresponding reflecting mirrors 82a, 82b, respectively, and guided to the light incident surface 31 of the light transmitting member 3. Note that the reflecting mirrors 82a, 82b only need to have a reflecting function, and are not necessarily required to be flat, and the reflecting function may be imparted to the inclined surfaces of a prism.

[0095] Furthermore, the number of light source units is not limited to two, and a third light source unit and a fourth light source unit may be further provided, making the number of light source units three or more, and the present invention is applied to at least two of the three or more light source units. In other words, the present invention can be applied to light emitted from two or more light source units and having different angles of incidence on the light transmitting member 3, and is not limited by the number of light source units.

[0096] In addition, even if the light source unit is physically one, it is possible that the light source unit is provided with two or more light sources. When the light emitted from each light source is viewed from a direction perpendicular to the central axis of the light transmitting member, there may be light that enters the light transmitting member at a positive angle with respect to the central axis of the light transmitting member and light that enters the light transmitting member at a negative angle with respect to the central axis, and the present invention is also applicable to such cases.

[0097] That is, the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12, and the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22 may be configured as one light source unit. Also, the first light-guiding optical system and the second light-guiding optical system may be configured as the same light-guiding optical system.

[0098] <Illuminance distribution example> 15 to 19 are diagrams showing an example of the illuminance distribution of light L emitted from light source device 100. Fig. 15 to Fig. 19 show examples of the illuminance distribution of light L under different conditions. Each example is a result of calculating the illuminance distribution obtained in the vicinity of the exit surface of light transmitting member 3 by simulation.

[0099] The first example shown in Figure 15 is a result corresponding to the full light mode shown in Figure 4. The illuminance deviation in the first example was 6.98% for the entire range. The illuminance deviation is a value calculated by (maximum illuminance - minimum illuminance) / (maximum illuminance + minimum illuminance).

[0100] The second example shown in Fig. 16 is a case where the first large-angle light-emitting unit 12 and the second large-angle light-emitting unit 22 are turned on simultaneously, and the results correspond to the first pattern A, the sixth pattern A, and the seventh pattern B shown in Fig. 4. The illuminance deviation in the second example was 6.48% over the entire area.

[0101] The third example shown in Fig. 17 is a case where the first small-angle light-emitting unit 11 and the second small-angle light-emitting unit 21 are turned on, and the results correspond to the first pattern B, the sixth pattern B, and the seventh pattern A shown in Fig. 4. The illuminance deviation in the third example was 6.95% over the entire range.

[0102] The fourth example shown in Fig. 18 is a case where the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 are turned on, and the result corresponds to the pattern A of the fifth pattern in Fig. 4. The illuminance deviation in the fourth example was 7.78% over the entire range.

[0103] The fifth example shown in Fig. 19 is a case where the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 are turned on, and the result corresponds to the pattern B of the fifth pattern in Fig. 4. The illuminance deviation in the fifth example was 7.56% over the entire range.

[0104] From the above, it was found that the illuminance deviation could be kept to 10% or less and illuminance unevenness could be reduced in Examples 1 to 5. It was also found that the illuminance unevenness could be reduced in Examples 1 to 3 compared to Examples 4 and 5.

[0105] The above illuminance deviation is set over the entire required illumination area, and is set to an extremely ideal value of 10% or less. This is more than enough to realize a light source device with reduced illuminance unevenness, which is the objective of the embodiment of the present disclosure. On the other hand, when applied to a projection device, it is not necessarily necessary to set the illuminance deviation to 10% or less over the entire surface. For example, there may be cases where there is no problem in practical use if the desired illuminance deviation is secured within a range of, for example, 90% of the area from the center of the image to the periphery. It depends on the specifications required by the device to be used.

[0106] Generally, it is said that a deviation of more than 50% is clearly distinguishable as illuminance unevenness, and that it is not so noticeable when it drops to about 30%. Illuminance unevenness on the screen of a projected image from a projection device appears as a result of the cumulative illuminance deviation of the light source device, the light intensity deviation of the lighting optical system that illuminates the panel (light intensity deviation of the lighting optical system), and the light intensity deviation of the projection lens. If the illuminance deviation of the projected image of the projection device, which is a combination of the light source device, lighting system, and projection system, is 30% or less, it can have sufficient quality on its own. Since illuminance unevenness of the device as a whole cannot be eliminated by simply increasing the illuminance deviation of the light source device itself, and it also depends on the light intensity deviation of the lighting optical system and the projection lens, the illuminance deviation required for the light source device can be determined by taking into account these specifications.

[0107] Situations in which illuminance deviation needs to be strictly controlled include, for example, stacking projection in which multiple projection devices are stacked, and particularly, tiling projection in which multiple connected screens are projected. In these cases, if the illuminance deviation differs between projection devices, uneven illuminance at the boundaries where the screens are connected can become noticeable. In these cases, the embodiments of the present disclosure are suitable.

[0108] On the other hand, when the projection device is used alone, rather than the above-mentioned stacking projection or tiling projection, it is not necessary to strictly manage the illuminance deviation. Also, when used in a bright place rather than a darkroom, the background is bright, so the illuminance unevenness of the projection screen is less noticeable. It is a well-known fact that the way illuminance unevenness is seen changes depending on the usage environment. Therefore, if the first light source unit 1 and the second light source unit 2 each satisfy the target value of the illuminance deviation within a certain range from the center of the screen, it is sufficient to use the device even if only the first light source unit 1 is driven for a certain period of time. It is also sufficient to use the device even if only the second light source unit 2 is driven for a certain period of time. In other words, if the illuminance deviation value of each of the first light source unit 1 and the second light source unit 2 is small, each light source unit may be driven independently at a predetermined switching cycle.

[0109] Also, the smaller the difference between the illuminance deviation values ​​of the first light source unit 1 and the second light source unit 2, the better. Therefore, when the projection device is used alone, when the illuminance deviations of the first light source unit 1 and the second light source unit 2 are set to a desired value or less, the object of the present invention can be achieved by switching between the first light source unit 1 and the second light source unit 2. The desired value here is preferably 10% or less over the entire range, as shown in the fourth example in FIG. 18 and the fifth example in FIG. 19. It is desirable that the illuminance unevenness be 10% for the light source device, and that the unevenness of the illumination optical system and the projection optical system be superimposed on this, resulting in an illuminance unevenness of 30% or less for the projection device.

[0110] If the illumination optical system and projection optical system can be constructed ideally, with each being 5% and the total being 10%, then the light source device can tolerate up to 20%. In this way, if the light quantity deviation of the illumination optical system and projection optical system is small, the illuminance deviation required of the device will be large.

[0111] On the other hand, in cases where tiling projection is performed using multiple projection devices and a control system that controls the projection of multiple projection devices, the smaller the unevenness in illuminance between adjacent projected images, the less the burden of image processing in the peripheral areas will be reduced, making it possible to construct a brighter and more efficient projection system.

[0112] <Modification> FIG. 20 is a schematic diagram showing an example of the configuration of a light source device 100c according to a modified example of the third embodiment of the present disclosure.

[0113] The light source device 100c differs from the third embodiment mainly in that it has a prism 83 instead of the reflecting mirror 82. Even when the light source device 100c has a configuration in which the prism 83 is included, the same effects as those of the third embodiment can be obtained.

[0114] [Fourth embodiment] Next, a description will be given of a projection device according to a fourth embodiment. Fig. 21 is a schematic diagram showing the configuration of a projection device 50 according to a fourth embodiment of the present disclosure.

[0115] The projection device 50 differs from the first embodiment mainly in that it has a light source device 100, a light modulation section 540 that spatially modulates the light L irradiated from the light source device 100, and a projection section 520 that projects the light L modulated by the light modulation section 540.

[0116] In the example shown in FIG. 21, the projection device 50 has an illumination optical system 510 and a projection unit 520 on the downstream side of the light irradiation direction of the light source device 100 shown in FIG. 1. Light L is incident on the illumination optical system 510 from the light transmitting member 3 of the light source device 100. The illumination optical system 510 outputs the light L to the projection unit 520. The illumination optical system 510 has various elements such as a color wheel 530 and a light modulation unit 540 inside. The color wheel 530 is a disk with red, blue, or green filters integrated together, and converts the light L into time-divided light of red, green, or blue by passing the light L from the light source device 100 while rotating. The light modulation unit 540 is composed of a liquid crystal panel, a DMD (Digital Micromirror Device), or the like, and spatially modulates the light L from the color wheel 530.

[0117] The projection unit 520 outputs the light L modulated by the light modulation unit 540 of the illumination optical system 510 as a projection image P. In FIG. 21, the configuration is such that the direction in which the projection image P is output from the projection unit 520 (Y direction) is perpendicular to the optical axis direction (X direction) of the light L output from the light source device 100. In other words, the light source device 100 is arranged so that the optical axis direction of the light L output from the light source device 100 is perpendicular to the arrangement direction (Y direction) of the illumination optical system 510 and the projection unit 520. In this case, the light L of the light source device 100 is directly input to the illumination optical system 510.

[0118] The projection device 50 includes the light source device 100, and thus can reduce illuminance unevenness when the illuminance of the light L irradiated from the light source device 100 is made lower than a predetermined illuminance. By making the illuminance lower than a predetermined illuminance, the life of the light source device 100 is extended, so that the frequency of replacing the light source device 100 is reduced, and the maintenance work for the projection device 50 can be reduced. Furthermore, by reducing the illuminance unevenness of the light L irradiated from the light source device 100, the unevenness in brightness in the projection image P can be reduced, and the quality of the projection image P can be improved.

[0119] In the light source device 100 provided in the projection device 50, the driving unit 4 alternately turns off the first group G1 and the second group G2 (see FIG. 1) or alternately reduces the amount of light of the first light L1 from the first group G1 and the amount of light of the second light L2 from the second group G2 according to a predetermined switching cycle. In this case, the light modulation unit 540 generates a projection image at a predetermined frame cycle, and the length of the switching cycle can be set to be equal to or shorter than the length of the frame cycle. This makes it possible to make the person viewing the projection image by the projection device 50 almost unaware of the switching to the first group G1 and the second group G2. In addition, in the fifth pattern shown in FIG. 4, when switching between the lighting of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 and the lighting of the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22, the length of the switching cycle can also be set to be equal to or shorter than the length of the frame cycle. In this case as well, it is possible to make the switching to the first set G1 and the second set G2 almost invisible to a person viewing the image projected by the projection device 50.

[0120] In the light source device 100 included in the projection device 50, the driving unit 4 alternately turns off the first group G1 and the second group G2, or alternately reduces the amount of light of the first light L1 from the first group G1 and the amount of light of the second light K2 from the second group G2. In this case, the driving unit 4 can alternately turn off the first group G1 and the second group G2, or alternately reduce the amount of light of the first light L1 from the first group G1 and the amount of light of the second light L2 from the second group G2, every time the projection device 50 is started. This makes it possible to reduce illuminance unevenness so that it is not noticeable when the illuminance of the light L irradiated from the light source device 100 is lowered below a predetermined illuminance.

[0121] The interval (switching cycle) at which the first light source unit 1 and the second light source unit 2, or the first light L1 and the second light amount are alternately turned off or reduced is preferably a time equivalent to one frame of 24 to 50 fps (frames per second), which is often used when generating images. If the illuminance deviation between the first light source unit 1 and the second light source unit 2, or the illuminance deviation between the first light L1 and the second light amount is sufficiently small, the switching cycle does not necessarily need to be short, and may be a long cycle, such as every time the device is started up.

[0122] The projection device 50 may have a light source device 100a, a light source device 100b, or a light source device 100c instead of the light source device 100. However, since the light source device 100a has a color wheel 92, when the projection device 50 includes the light source device 100a, the illumination optical system 510 does not need to have a color wheel 530 therein.

[0123] [Variations] Various other examples of the embodiments of the present disclosure will be described below.

[0124] <Example 1> Fig. 22 is a block diagram showing another example of the control unit 5 included in the light source device 100. In the example shown in Fig. 22, the control unit 5 according to this example mainly differs from the control unit 5 shown in Fig. 3 in that it has a video signal detection unit 507.

[0125] If the light source device 100 continues to operate in a specific operation mode other than the full-light mode, a specific light-emitting unit will continue to deteriorate, and the usage time of each light-emitting unit may vary. For example, if the light-emitting unit includes a semiconductor laser element, it is known that the output will be approximately half after a long period of use (e.g., 20,000 hours) even if it is continued to be used under the same lighting drive conditions (current, temperature, etc.). Therefore, it is desirable to always average the usage time of the first small-angle light-emitting unit 11 and the first large-angle light-emitting unit 12 of the first light-emitting unit 10, and the second small-angle light-emitting unit 21 and the second large-angle light-emitting unit 22 of the second light-emitting unit 20. By averaging the usage time, it is possible to reduce the variation in the light source output caused by switching the operation mode.

[0126] In this example, the video signal detection unit 507 detects the connection of a video signal cable such as an HDMI (High-Definition Multimedia Interface, registered trademark) to the I / F 55, or the reception of a video signal from an external PC, an external server, or the like via a network, etc. When the video signal detection unit 507 detects the connection of a video signal cable or the reception of a video signal, it can determine the resolution, frame rate, display method (color format, 3D, etc.), etc.

[0127] The control unit 5 controls the operation of each of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22 so as to average the usage times of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22, according to the information on the resolution, frame rate, and display format determined by the video signal detection unit 507. This makes it possible for the light source device 100 to reduce the variation in the usage times of the first small-angle light-emitting unit 11, the first large-angle light-emitting unit 12, the second small-angle light-emitting unit 21, and the second large-angle light-emitting unit 22, and to reduce the variation in the light source output due to switching of the operation mode.

[0128] <Second Example> As described in the first embodiment of the present disclosure, the light source device 100 can switch between the first set G1 and the second set G2, etc., every time the light source device 100 is started up. Fig. 23 is a flowchart showing an example of the operation of the light source device 100 when switching the set every time the light source device 100 is started up.

[0129] In the example shown in FIG. 23, first, in step S21, the light source device 100 determines whether or not the next start-up of the light source device 100 has been executed.

[0130] If it is determined in step S21 that the operation has not been performed (step S21, No), the light source device 100 repeats the operation of step S21 until it is determined that the next startup of the light source device 100 has been performed. On the other hand, if it is determined in step S21 that the operation has been performed (step S21, Yes), the light source device 100 switches the set of light sources to be turned on in step S22. After that, the light source device 100 ends the operation.

[0131] In this manner, the light source device 100 can switch the pair every time the light source device 100 is started up.

[0132] <Example 3> As described in the first embodiment of the present disclosure, the light source device 100 can switch between the first set G1 and the second set G2, etc., every predetermined time, every predetermined number of days, every predetermined cumulative lighting time, etc. Fig. 24 is a flowchart showing an example of the operation of the light source device 100 when switching the sets every predetermined time, every predetermined number of days, or every predetermined cumulative lighting time.

[0133] In the example shown in FIG. 24, first, in step S31, the light source device 100 determines whether any one of a predetermined time, a predetermined number of days, and an accumulated lighting time has been reached.

[0134] In step S31, if it is determined that the predetermined time, the predetermined number of days, or the accumulated lighting time has not been reached (step S31, No), the light source device 100 repeats the operation of step S31 until it is determined that any one of the predetermined time, the predetermined number of days, or the accumulated lighting time has been reached.

[0135] On the other hand, if it is determined in step S31 that the time has been reached (Yes in step S31), then in step S32, the light source device 100 determines whether or not the next startup has been performed. If it is determined in step S32 that the next startup has not been performed (No in step S32), the light source device 100 repeats the operation of step S32 until it is determined that the next startup of the light source device 100 has been performed. On the other hand, if it is determined in step S32 that the next startup has been performed (Yes in step S32), then in step S33, the light source device 100 switches the set of light sources to be turned on. After that, the light source device 100 ends the operation.

[0136] In this manner, the light source device 100 can switch between the first set G1 and the second set G2, etc., every predetermined time, every predetermined number of days, every predetermined accumulated lighting time, or the like.

[0137] <Example 4> Even during startup, the light source device 100 can switch between the first set G1 and the second set G2, etc., to be used after a predetermined time has elapsed since startup. Fig. 25 is a flowchart showing an example of the operation of the light source device 100 when switching the sets after a predetermined time has elapsed since startup.

[0138] In the example shown in FIG. 25, first, in step S41, the light source device 100 determines whether or not the time that has elapsed since the start-up of the light source device 100 has reached a predetermined time.

[0139] In step S41, if it is determined that the process has not been performed (step S41, No), the light source device 100 repeats the operation of step S41 until it is determined that the elapsed time since the start-up of the light source device 100 has reached a predetermined time.

[0140] On the other hand, if it is determined in step S41 that the set has been reached (Yes in step S41), the light source device 100 switches the set of light sources to be turned on in step S .Then, the light source device 100 ends the operation.

[0141] In this manner, the light source device 100 can switch the set to be used after a predetermined time has elapsed since startup.

[0142] For example, under the conditions of every predetermined time, every predetermined number of days, or every predetermined cumulative lighting time shown in the third example, the set to be used at the next startup after this time is met is switched. However, when the light source device 100 is driven for a long time for signage use or the like, the next startup timing may take a long time to arrive. This may cause a difference between the set switching time and the actual switching time, resulting in differences in the operating times of the multiple sets and causing uneven illuminance. By immediately switching the sets after a predetermined time has elapsed even during startup, the operating times of the multiple sets can be kept uniform.

[0143] <5th Example> The light source device 100 may switch between the first set G1 and the second set G2 to be used when a predetermined time has elapsed since startup and when the input signal is switched. Fig. 26 is a flowchart showing an example of the operation of the light source device 100 when switching the sets when a predetermined time has elapsed since startup and when the input signal is switched.

[0144] In the example shown in FIG. 26, first, in step S51, the light source device 100 determines whether or not the time that has elapsed since the start-up of the light source device 100 has reached a predetermined time.

[0145] In step S51, if it is determined that the predetermined time has not been reached (step S51, No), the light source device 100 repeats the operation of step S51 until it is determined that the elapsed time from the start-up of the light source device 100 has reached the predetermined time.

[0146] On the other hand, if it is determined in step S51 that the time has been reached (Yes in step S51), then in step S52, light source device 100 determines whether or not switching of the input signal has occurred. If it is determined in step S52 that switching of the input signal has not occurred (No in step S52), light source device 100 repeats the operation of step S52 until it is determined that switching of the input signal has occurred. On the other hand, if it is determined in step S52 that switching has occurred (Yes in step S52), then in step S53, light source device 100 switches the set of light sources to be turned on.

[0147] In this manner, the light source device 100 can switch the set to be used when a predetermined time has elapsed since startup and when the input signal is switched.

[0148] For example, if the set of light sources is switched immediately during startup, interruptions in the image may occur during normal use other than for signage purposes, which may confuse the user of the light source device 100. In this example, by switching the set of light sources at the timing when some projection switching occurs, such as switching of the input signal, displaying a test pattern, or projecting a logo while waiting for input, and when a predetermined time has elapsed after startup, it is possible to switch the set of light sources with reduced interruptions in the image.

[0149] <Example 6> The light source device 100 can also change the predetermined time for switching depending on the degree of deterioration of the set being used. A specific example will be described with reference to Fig. 27 and Fig. 28. Fig. 27 is a flowchart showing an example of an operation for changing the predetermined time for switching in the light source device 100. Fig. 28 is a diagram showing an example of the (X+1)th switching period. Note that the X-axis in Fig. 28 indicates time, and the Y-axis indicates brightness.

[0150] In the example shown in FIG. 27, first, in step S61, the light source device 100 obtains and stores the brightness a1 using the color sensor when the first group G1 starts to be turned on.

[0151] Next, in step S62, the light source device 100 determines whether or not the predetermined time has been reached. If it is determined in step S62 that the predetermined time has not been reached (step S62, No), the light source device 100 repeats the operation of step S62 until it is determined that the predetermined time has been reached. On the other hand, if it is determined in step S62 that the predetermined time has been reached (step S62, Yes), in step S63, the light source device 100 obtains and stores the brightness a2 at that time point using the color sensor.

[0152] Next, in step S64, the light source device 100 obtains and stores the amount of change from the first set of G1 brightness a1 and brightness a2.

[0153] Next, in step S65, the light source device 100 switches the set of light sources, and obtains and stores the brightness a1 of the second set G2.

[0154] Next, in step S66, the light source device 100 determines whether or not the predetermined time has been reached. If it is determined in step S66 that the predetermined time has not been reached (step S66, No), the light source device 100 repeats the operation of step S66 until it is determined that the predetermined time has been reached. On the other hand, if it is determined in step S66 that the predetermined time has been reached (step S66, Yes), in step S67, the light source device 100 uses the color sensor to obtain and store the brightness a2 at that time point.

[0155] Next, in step S68, the light source device 100 obtains and stores the amount of change from the brightness a1 and the brightness a2 of the second set G2.

[0156] Next, in step S69, the light source device 100 compares the amounts of change stored in the first set G1 and the second set G2.

[0157] Next, in step S70, it is determined whether the amount of change in the first group G1 is smaller than the amount of change in the second group G2. If it is determined in step S70 that the amount of change in the first group G1 is smaller (Yes in step S70), in step S71, the light source device 100 determines that the first group G1 has less deterioration of the light source, and switches the light source group from the second group G2 to the first group G1. At that time, the light source device 100 also extends the lighting time by +α hours, which is the next switching time. After that, the light source device 100 ends the operation.

[0158] On the other hand, if it is determined in step S70 that the amount of change in the first group G1 is not small (step S70, No), then in step S72, the light source device 100 determines that the second group G2 is less deteriorated as a light source, and does not immediately switch to the first group G1, but instead extends the lighting time by +α hours.

[0159] Next, in step S73, the light source device 100 determines whether the extended time has been reached. If it is determined in step S73 that the extended time has not been reached (step S73, No), the light source device 100 repeats the operation of step S73 until it is determined that the extended time has been reached. On the other hand, if it is determined in step S73 that the extended time has been reached (step S73, Yes), in step S74, the light source device 100 switches the light source set to the first set G1. Thereafter, the light source device 100 ends its operation. Note that the extended time in step S73 (extended time) can be determined using a table corresponding to the amount of change in brightness, such as that shown in Table 1 below. [Table 1]

[0160] In this example, it is possible to reduce the occurrence of uneven illuminance after the light source device 100 is driven for a long period of time due to the deterioration of one of the two pairs.

[0161] <Example 7> Next, a seventh example of another configuration of the projection device 50 will be described. FIG. 29 is a schematic diagram showing an example of another configuration of the projection device 50.

[0162] 29 has an illumination optical system 510 and a projection unit 520 on the downstream side in the light irradiation direction of the light source device 100 shown in FIG. 1, that is, on the side where light is emitted from the light source device 100. Light L is incident on the illumination optical system 510 from the light transmitting member 3 of the light source device 100. The illumination optical system 510 emits the light L to the projection unit 520. The illumination optical system 510 includes a color wheel 530, a light modulation unit 540, and an actuator 550.

[0163] The light modulation unit 540 can achieve pseudo-high resolution even if the physical resolution is full HD (High Definition) by combining it with the actuator 550. When the video signal detection unit 507 detects a high-resolution video signal such as 4K, the projection device 50 projects the light L modulated by the light modulation unit 540 as a projection image P. At this time, the projection device 50 drives the actuator 550 so that the projection image P rotates around four locations (in the order of upper left, upper right, lower right, and lower left when viewed from the center position) while shifting the projection position on the screen by 1 / 2 pixel in two directions, horizontal and vertical. Four subframes are output from the light modulation unit 540 to generate one frame of 4K video.

[0164] Furthermore, when the projection device 50 detects a 3D video signal by the video signal detection unit 507, it projects the light L modulated by the light modulation unit 540 as a projection image P. At this time, the projection image P sequentially projects images for the right eye and the left eye on the screen. Two subframes are output from the light modulation unit 540 to generate one frame of a 3D video. A user of the projection device 50 can recognize the 3D video by viewing the screen through filter-controllable glasses for the right or left eye at a timing synchronized with the projection image P.

[0165] <Example 8> Next, various operation modes of the light source device 100 will be described as an eighth example. FIGS. 30 to 32 are diagrams for explaining various operation modes of the light source device 100 according to an embodiment of the present disclosure. FIG. 30 is a diagram illustrating a first example of an operation mode of the light source device 100. FIG. 31 is a diagram illustrating a second example of an operation mode of the light source device 100. FIG. 32 is a diagram illustrating a third example of an operation mode of the light source device 100. In FIGS. 30 to 32, a signal indicated by diagonal hatching slanting downward to the right indicates the emission timing of blue light from the light source device 100. A signal indicated by diagonal hatching slanting upward to the right indicates the emission timing of green light from the light source device 100. A signal indicated by horizontal hatching indicates the emission timing of yellow light from the light source device 100.

[0166] FIG. 30 shows the operation of light source device 100 when the lighting pattern in the double life mode (first patterns A and B) of the four operation modes shown in FIG. 4 is switched every 4K frame.

[0167] FIG. 31 shows the operation of light source device 100 when video signal detection unit 507 receives, for example, full HD video, and in the operating mode of FIG. 4, the lighting pattern of the double life mode (first pattern patterns A and B) is switched every frame of full HD.

[0168] FIG. 32 shows the operation of light source device 100 when video signal detection unit 507 receives, for example, full HD (3D) video, and when, in the operating mode of FIG. 4, the lighting pattern of the double life mode (first pattern, pattern A and pattern B) is switched every frame of full HD (3D).

[0169] Although the preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0170] The ordinal numbers, quantities, and other numbers used in the description of the embodiments are all provided as examples to specifically explain the technology of the present disclosure, and the present disclosure is not limited to the illustrated numbers. Furthermore, the connection relationships between the components are provided as examples to specifically explain the technology of the present disclosure, and do not limit the connection relationships that realize the functions of the present disclosure.

[0171] The division of blocks in the functional block diagram is an example, and multiple blocks may be realized as one block, one block may be divided into multiple blocks, or some functions may be moved to other blocks. Furthermore, the functions of multiple blocks having similar functions may be processed in parallel or in time-sharing by a single piece of hardware or software. Furthermore, some or all of the functions may be distributed to multiple computers.

[0172] Aspects of the present disclosure are, for example, as follows. <1> a first light source unit capable of emitting a first light from one or more first light-emitting units, a second light source unit capable of emitting a second light from one or more second light-emitting units, a light-transmitting member that transmits the first light and the second light incident thereon, and a drive unit capable of individually driving the one or more first light-emitting units and the one or more second light-emitting units, wherein the light source device is capable of irradiating the first light and the second light transmitted through the light-transmitting member, the drive unit being capable of individually reducing an amount of the first light emitted from each of the one or more first light-emitting units and the second light emitted from each of the one or more second light-emitting units, or individually turning off the one or more first light-emitting units and the one or more second light-emitting units, wherein the first light is incident on the light-transmitting member at a positive angle with respect to the central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis, and the second light is incident on the light-transmitting member at a negative angle with respect to the central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis. <2> a control unit that controls an operation of the drive unit, the control unit having a light emission control unit, the light emission control unit individually reduces an amount of the first light emitted from each of the one or more first light-emitting units and the second light emitted from each of the one or more second light-emitting units, or controls the one or more first light-emitting units and the one or more second light-emitting units to be turned off individually, and is capable of controlling the second light to be incident on the light-transmitting member at the negative angle with respect to the central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis, <1> 2 is a light source device according to the first embodiment. <3> the first light source unit has two or more of the first light emitting units including a first small angle light emitting unit and a first large angle light emitting unit, the second light source unit has two or more of the second light emitting units including a second small angle light emitting unit and a second large angle light emitting unit, when the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light, which is emitted from the first small angle light emitting unit and incident on the light transmitting member, with respect to the central axis is smaller than an absolute value of an angle of the chief ray of the first light, which is emitted from the first large angle light emitting unit and incident on the light transmitting member, with respect to the central axis, when the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of the chief ray of the second light, which is emitted from the second small angle light emitting unit and incident on the light transmitting member, with respect to the central axis is smaller than an absolute value of an angle of the chief ray of the second light, which is emitted from the second large angle light emitting unit and incident on the light transmitting member, with respect to the central axis; <1> Also mentioned above <2> 2 is a light source device according to the first embodiment. <4> When the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light emitted from the first small-angle light emitting unit and incident on the light transmitting member with respect to the central axis is equal to an absolute value of an angle of a chief ray of the second light emitted from the second small-angle light emitting unit and incident on the light transmitting member with respect to the central axis, and when the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light emitted from the first large-angle light emitting unit and transmitted by the light transmitting member with respect to the central axis is equal to an absolute value of an angle of a chief ray of the second light emitted from the second large-angle light emitting unit and incident on the light transmitting member with respect to the central axis. <3> 2 is a light source device according to the first embodiment. <5> the first small-angle light-emitting unit and the second small-angle light-emitting unit form a first set, and the first large-angle light-emitting unit and the second large-angle light-emitting unit form a second set, and the driving unit alternately turns off the first set and the second set, or alternately reduces the amount of light of the first light from the first set and the amount of light of the second light from the second set. <3> or the above <4> 2 is a light source device according to the first embodiment. <6> the driving unit alternately turns off the first set and the second set, or alternately reduces the amount of the first light from the first set and the amount of the second light from the second set, in a predetermined switching cycle; <5> 2 is a light source device according to the first embodiment. <7> Each of the first light emitting unit and the second light emitting unit includes at least one of a light emitting diode element and a semiconductor laser element. <1> From the above <6> 1 is a light source device according to any one of the above items. <8> the wavelength conversion element includes a wavelength conversion region and a light reflection region and further includes a rotatable wavelength conversion element, the first light emitting unit emits the first light of blue, the second light emitting unit emits the second light of blue, the wavelength conversion element receives the first light and the second light in the wavelength conversion region to emit wavelength converted light, and receives the first light and the second light in the light reflection region to emit blue reflected light, and the wavelength conversion element is capable of alternately irradiating the wavelength converted light and the blue reflected light from the light transmitting member by rotating the wavelength conversion element; <1> From the above <7> 1 is a light source device according to any one of the above items. <9> The first light and the second light are light of a first wavelength band, and the wavelength conversion element receives the first light and the second light and emits light of a second wavelength band different from the first wavelength band. If a period during which the light source device irradiates light of the first wavelength band without passing through the wavelength conversion element is t1 and a period during which the light source device irradiates light of the second wavelength band from the wavelength conversion element is t2, then t1 and t2 are different, and the light of the first wavelength band irradiated at t1 and the light of the second wavelength band irradiated at t2 are each irradiated with at least a part of a wavelength band, or at least a part of the periods of t1 and t2 are combined to irradiate light of a first output, and a second mode in which light of a second wavelength band different from the light of the first output is irradiated with light of a second wavelength band different from the light of the first output. and a second mode for irradiating light of an output of 2, wherein in the first mode, an output of the first light source unit required to obtain light of the first wavelength band is defined as M1_PLD1, an output of the first light source unit or the second light source unit required to obtain light of the second wavelength band is defined as M1_PLD2, and a ratio of the M1_PLD1 and the M1_PLD2 is defined as η1, and in the second mode, an output of the first light source unit or the second light source unit required to obtain light of the first wavelength band is defined as M2_PLD1, an output of the first light source unit or the second light source unit required to obtain light of the second wavelength band is defined as M2_PLD2, and a ratio of the M2_PLD1 and the M2_PLD2 is defined as η2, where η1 and η2 are different. <8> 2 is a light source device according to the first embodiment. <10> a ratio between the output of the light of the first wavelength band incident on the wavelength conversion element and the output of the light of the second wavelength band output by the wavelength conversion element after receiving the light of the first wavelength band becomes smaller as the output of the light of the first wavelength band becomes larger; <9> 2 is a light source device according to the first embodiment. <11> the amount of light emitted from the light source device in the first mode is greater than the amount of light emitted from the light source device in the second mode, and satisfies η1<η2; <9> or the above <10> 2 is a light source device according to the first embodiment. <12> the light source device emits light of a first chromaticity coordinate in the first mode and emits light of a second chromaticity coordinate in the second mode, and the η2 is determined so that the first chromaticity coordinate and the second chromaticity coordinate are substantially equal to each other. <9> From the above <11> 1 is a light source device according to any one of the above items. <13> the wavelength conversion element is capable of receiving light of the second wavelength band and further emitting light of a third wavelength band, and the light source device irradiates at least light of the first wavelength band and light of the third wavelength band; <9> From the above <12> 1 is a light source device according to any one of the above items. <14> The optical fiber further includes a first wavelength conversion element and a second wavelength conversion element that are rotatable and include a wavelength conversion region and a light reflection region, the first light emitting unit emits the first light of blue, the second light emitting unit emits the second light of blue, the first wavelength conversion element emits wavelength-converted light by receiving the first light in the wavelength conversion region and is capable of emitting blue reflected light by receiving the first light in the light reflection region, the second wavelength conversion element emits the wavelength-converted light by receiving the second light in the wavelength conversion region and is capable of emitting the blue reflected light by receiving the second light in the light reflection region, and the wavelength-converted light and the blue reflected light can be alternately emitted from the light transmitting member by rotating each of the first wavelength conversion element and the second wavelength conversion element. <1> From the above <13> 1 is a light source device according to any one of the above items. <15> The first light source unit and the second light source unit are alternately turned on. <1> From the above <14> 1 is a light source device according to any one of the above items. <16> The first light source unit and the second light source unit are turned on simultaneously. <1> From the above <14> 1 is a light source device according to any one of the above items. <17> a first light source unit capable of emitting a first light from one or more first light-emitting units, a second light source unit capable of emitting a second light from one or more second light-emitting units, a light-transmitting member that transmits the first light and the second light incident thereon, a drive unit capable of individually driving the one or more first light-emitting units and the one or more second light-emitting units, and a control unit that controls an operation of the drive unit, and the first light and the second light that have transmitted through the light-transmitting member can be irradiated, and the drive unit controls the first light emitted from each of the one or more first light-emitting units and the second light emitted from each of the one or more second light-emitting units. the control unit is capable of alternately switching, at a predetermined switching period, between a state in which both the first light and the second light are incident on the light-transmitting member at a positive angle with respect to the central axis of the light-transmitting member and a state in which both the first light and the second light are incident on the light-transmitting member at a negative angle with respect to the central axis, when the light-transmitting member is viewed from a direction perpendicular to the central axis of the light-transmitting member. <18> The direction perpendicular to the central axis of the light transmitting member is a direction perpendicular to the central axis 30 of the light transmitting member 3, and is a direction (PL1) perpendicular to a line connecting a starting point (L1S) of the first light (principal ray) directly traveling to the light transmitting member 3 and a point (L1E) where the first light enters the light transmitting member 3, and a direction perpendicular to the central axis 30 of the light transmitting member 3 and is a direction (SV) that symmetrically divides a direction (PL2) perpendicular to a line connecting a starting point (L2S) of the second light (principal ray) directly traveling to the light transmitting member 3 and a point (L2E) where the second light enters the light transmitting member 3. <1> From the above <17> 1 is a light source device according to any one of the above items. <19> The above <1> From the above <18> a light source device according to any one of the above, a light modulation section that spatially modulates the light irradiated from the light source device, and a projection section that projects the light modulated by the light modulation section. <20> The above <6> or the above <18> a light source device as described above, a light modulation section which spatially modulates the light irradiated from the light source device, and a projection section which projects the light modulated by the light modulation section, wherein the light modulation section is capable of generating a projection image at a predetermined frame period, and the length of the switching period is equal to or less than the length of the frame period. <21> The above <5> a light source device as described above, a light modulation section which spatially modulates the light irradiated from the light source device, and a projection section which projects the light modulated by the light modulation section, wherein the drive section alternately turns off the first set and the second set, or alternately reduces the amount of the first light from the first set and the amount of the second light from the second set, each time the projection device is started. [Explanation of symbols]

[0173] 1 1st light source section 10 First light emitting part 11 First small angle light emitting section 12 First large angle light emitting part 13 First light guide optical system 131 First Lens 132 Second lens 133 Third Lens 134 4th lens 135 5th lens 14 Third light guide optical system 141 18th lens 142 19th Lens 143 20th Lens 144 1st folding mirror 145 21st Lens 146 22nd Lens 147 23rd Lens 2 Second light source section 20 Second light emitting part 21 Second small angle light emitting section 22 Second large angle light emitting part 23 Second light guiding optical system 231 6th Lens 232 7th Lens 233 8th Lens 234 9th Lens 235 10th lens 24 4th light guide optical system 241 24th lens 242 25th Lens 243 26th Lens 244 2nd folding mirror 245 27th Lens 246 28th Lens 247 29th Lens 3. Light-transmitting material 30 center axis 31 Light incidence surface 4 Drive unit 5. Control section 51 CPU 52 ROM 53 RAM 54 HDD / SSD 55 Interface 501 Reception 502 Light emission information acquisition unit 503 Storage Unit 504 Switching condition acquisition unit 505 Light Emission Control Unit 506 Output section 507 Video signal detector 511 Support Information 6 Control section 7 Light guiding optical system 71 11th lens 72 12th lens 73 13th lens 74 14th lens 75 15th lens 76 16th lens 77 17th lens 81 Dichroic Mirror 82 Reflective Mirror 83 Prism 91 Wavelength conversion element 911 Wavelength conversion region 912 Light reflective area 911a Yellow fluorescent area 911b Green fluorescent area 91a First wavelength conversion element 91b Second wavelength conversion element 92 Color Wheel 921 Red filter area 922 Yellow transparent area 923 Blue Diffusion Area 924 Green Filter Area 50 Projection device 510 Illumination optical system 520 Projection section 530 Color Wheel 540 Optical Modulation Section 100, 100a, 100b, 100c light source device 111b, 111y, 111r, 111g output C1 Light Emitting Information C2 Switching Conditions G1 1st Group G2 2nd Group L light L1 First Light L11 1st small angle light L12 1st large angle light L2 Second Light L21 2nd small angle light L22 Second large angle light Lb blue reflected light Ln Wavelength conversion light Ls beam spot Md Operation mode information P projection image Pt Lighting pattern information θ11 1st small angle θ12 1st large angle θ21 2nd small angle θ22 2nd large angle [Prior art documents] [Patent documents]

[0174] [Patent Document 1] JP 2006-018327 A

Claims

1. a first light source unit capable of emitting a first light from one or more first light emitting units; a second light source unit capable of emitting second light from one or more second light emitting units; a light transmitting member that transmits the first light and the second light incident thereon; a drive unit capable of individually driving one or more of the first light-emitting units and one or more of the second light-emitting units, The first light and the second light transmitted by the light transmitting member can be irradiated, the drive unit is capable of individually reducing an amount of the first light emitted from each of the one or more first light-emitting units and an amount of the second light emitted from each of the one or more second light-emitting units, or individually turning off the one or more first light-emitting units and the one or more second light-emitting units, the first light is incident on the light transmitting member at a positive angle with respect to a central axis when the light transmitting member is viewed from a direction perpendicular to the central axis of the light transmitting member; The second light is incident on the light transmitting member at a negative angle with respect to the central axis when the light transmitting member is viewed from a direction perpendicular to the central axis.

2. A control unit that controls the operation of the drive unit, The control unit has a light emission control unit, The light emission control unit is The amount of the first light emitted from each of the one or more first light-emitting units and the amount of the second light emitted from each of the one or more second light-emitting units are individually reduced, or the one or more first light-emitting units and the one or more second light-emitting units are individually turned off, The light source device according to claim 1 , wherein the second light is controllable so that the second light is incident on the light transmitting member at the negative angle with respect to the central axis when the light transmitting member is viewed from a direction perpendicular to the central axis.

3. The first light source unit has two or more first light emitting units including a first small-angle light emitting unit and a first large-angle light emitting unit, The second light source unit has two or more second light emitting units including a second small-angle light emitting unit and a second large-angle light emitting unit, when the light transmitting member is viewed in a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light emitted from the first small-angle light-emitting unit and incident on the light transmitting member with respect to the central axis is smaller than an absolute value of an angle of a chief ray of the first light emitted from the first large-angle light-emitting unit and incident on the light transmitting member with respect to the central axis, 2. The light source device according to claim 1, wherein, when the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the second light emitted from the second small-angle light-emitting unit and incident on the light transmitting member with respect to the central axis is smaller than an absolute value of an angle of a chief ray of the second light emitted from the second large-angle light-emitting unit and incident on the light transmitting member with respect to the central axis.

4. when the light transmitting member is viewed in a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light emitted from the first small-angle light emitting unit and incident on the light transmitting member with respect to the central axis is equal to an absolute value of an angle of a chief ray of the second light emitted from the second small-angle light emitting unit and incident on the light transmitting member with respect to the central axis, 4. The light source device according to claim 3, wherein, when the light transmitting member is viewed from a direction perpendicular to the central axis, an absolute value of an angle of a chief ray of the first light emitted from the first large-angle light-emitting unit and transmitted by the light transmitting member with respect to the central axis is equal to an absolute value of an angle of a chief ray of the second light emitted from the second large-angle light-emitting unit and incident on the light transmitting member with respect to the central axis.

5. the first small-angle light-emitting portion and the second small-angle light-emitting portion form a first pair, The first large-angle light-emitting unit and the second large-angle light-emitting unit form a second pair, The light source device according to claim 3 , wherein the driving unit alternately turns off the first set and the second set, or alternately reduces an amount of the first light from the first set and an amount of the second light from the second set.

6. 6. The light source device according to claim 5, wherein the driving unit alternately turns off the first set and the second set, or alternately reduces the amount of light of the first light from the first set and the amount of light of the second light from the second set, according to a predetermined switching period.

7. The light source device according to claim 1 , wherein each of the first light-emitting portion and the second light-emitting portion includes at least one of a light-emitting diode element and a semiconductor laser element.

8. The optical fiber further includes a rotatable wavelength converting element including a wavelength converting region and a light reflecting region, the first light-emitting unit emits the first light of blue color, the second light-emitting unit emits the second light of blue color, the wavelength conversion element is capable of emitting wavelength-converted light by receiving the first light and the second light in the wavelength conversion region, and emitting blue reflected light by receiving the first light and the second light in the light reflection region, The light source device according to claim 1 , wherein the wavelength converted light and the reflected blue light can be alternately emitted from the light transmitting member by rotating the wavelength conversion element.

9. the first light and the second light are light of a first wavelength band, the wavelength conversion element receives the first light and the second light and emits light of a second wavelength band different from the first wavelength band; a period during which the light source device irradiates the light of the first wavelength band without passing through the wavelength conversion element is defined as t1; When the period during which the light source device irradiates the light of the second wavelength band from the wavelength conversion element is t2, The t1 and the t2 are different, a first mode in which at least a part of the wavelength band of the light irradiated during the period t1 and at least a part of the wavelength band of the light irradiated during the period t2 are irradiated, or a first output of light is irradiated during at least a part of the periods t1 and t2; a second mode of emitting a second output light different from the first output light, In the first mode, an output of the first light source unit required to obtain light of the first wavelength band is defined as M1_PLD1, In the first mode, an output of the first light-emitting unit or the second light-emitting unit required to obtain light of the second wavelength band is denoted by M1_PLD2; The ratio of M1_PLD1 to M1_PLD2 is η1, In the second mode, an output of the first light-emitting unit or the second light-emitting unit required to obtain light of the first wavelength band is defined as M2_PLD1; In the second mode, an output of the first light-emitting unit or the second light-emitting unit required to obtain light of the second wavelength band is denoted by M2_PLD2; If the ratio of M2_PLD1 to M2_PLD2 is η2, then The light source device according to claim 8 , wherein η1 and η2 are different.

10. 10. The light source device of claim 9, wherein the ratio between the output of the light in the first wavelength band incident on the wavelength conversion element and the output of the light in the second wavelength band emitted by the wavelength conversion element upon receiving the light in the first wavelength band becomes smaller as the output of the light in the first wavelength band becomes larger.

11. 10. The light source device according to claim 9, wherein an amount of light emitted from said light source device in said first mode is greater than an amount of light emitted from said light source device in said second mode, and satisfies η1<η2.

12. the light source device irradiates light of a first chromaticity coordinate in the first mode and irradiates light of a second chromaticity coordinate in the second mode; 10. The light source device according to claim 9, wherein the η2 is determined so that the first chromaticity coordinates and the second chromaticity coordinates substantially coincide with each other.

13. the wavelength conversion element is capable of receiving light in the second wavelength band and further emitting light in a third wavelength band; The light source device according to claim 9 , wherein the light source device emits at least light in the first wavelength band and light in the third wavelength band.

14. The optical fiber further includes a first wavelength conversion element and a second wavelength conversion element, the first wavelength conversion element and the second wavelength conversion element being rotatable, the first wavelength conversion element and the second wavelength conversion element including a wavelength conversion region and a light reflecting region, the first light-emitting unit emits the first light of blue color, the second light-emitting unit emits the second light of blue color, the first wavelength conversion element is capable of emitting wavelength-converted light by receiving the first light in the wavelength conversion region, and emitting blue reflected light by receiving the first light in the light reflection region; the second wavelength conversion element is capable of emitting the wavelength-converted light by receiving the second light in the wavelength conversion region, and emitting the blue reflected light by receiving the second light in the light reflection region, The light source device according to claim 1 , wherein the wavelength-converted light and the reflected blue light can be alternately emitted from the light transmitting member by rotating each of the first wavelength conversion element and the second wavelength conversion element.

15. The light source device according to claim 1 , wherein the first light source unit and the second light source unit are alternately turned on.

16. The light source device according to claim 1 , wherein the first light source unit and the second light source unit are turned on simultaneously.

17. a first light source unit capable of emitting a first light from one or more first light emitting units; a second light source unit capable of emitting second light from one or more second light emitting units; a light transmitting member that transmits the first light and the second light incident thereon; A drive unit capable of individually driving one or more of the first light-emitting units and one or more of the second light-emitting units; A control unit that controls the operation of the drive unit, The first light and the second light transmitted through the light transmitting member can be irradiated, the drive unit is capable of individually reducing an amount of the first light emitted from each of the one or more first light-emitting units and an amount of the second light emitted from each of the one or more second light-emitting units, or individually turning off the one or more first light-emitting units and the one or more second light-emitting units, the control unit is capable of alternately switching, at a predetermined switching period, between a state in which both the first light and the second light are incident on the light-transmitting member at a positive angle with respect to the central axis of the light-transmitting member and a state in which both the first light and the second light are incident on the light-transmitting member at a negative angle with respect to the central axis when the light-transmitting member is viewed from a direction perpendicular to the central axis of the light-transmitting member.

18. The direction perpendicular to the central axis of the light transmitting member is 2. The light source device according to claim 1, wherein the direction (SV) symmetrically divides a direction (PL1) that is perpendicular to the central axis 30 of the light transmitting member 3 and perpendicular to a line connecting a starting point (L1S) of the first light (principal ray) directed directly to the light transmitting member 3 and a point (L1E) where the first light enters the light transmitting member 3, and a direction (PL2) that is perpendicular to the central axis 30 of the light transmitting member 3 and perpendicular to a line connecting a starting point (L2S) of the second light (principal ray) directed directly to the light transmitting member 3 and a point (L2E) where the second light enters the light transmitting member 3.

19. A light source device according to any one of claims 1 to 14, 17, and 18; a light modulation unit that spatially modulates the light emitted from the light source device; a projection section that projects the light modulated by the light modulation section.

20. A light source device according to claim 6 or claim 17; a light modulation unit that spatially modulates the light emitted from the light source device; a projection unit that projects the light modulated by the light modulation unit, the light modulation unit is capable of generating a projection image at a predetermined frame period; A projection device, wherein the length of the switching period is equal to or shorter than the length of the frame period.

21. The light source device according to claim 5 ; a light modulation unit that spatially modulates the light emitted from the light source device; a projection unit that projects the light modulated by the light modulation unit, A projection device, wherein the driving unit alternately turns off the first set and the second set, or alternately reduces the amount of the first light from the first set and the amount of the second light from the second set, each time the projection device is started.

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