JP6152754B2 - Light source device - Google Patents

Description

  The present invention relates to a light source device including a plurality of laser light source units that emit light.

  Conventionally, as a light source device, a light source device including a plurality of laser light source units that emit light and a coupling optical system that combines light emitted from the plurality of laser light source units is known (for example, Patent Document 1 and 2). In such a light source device, the control unit individually performs feedback control on the output (the amount of light emitted) of each laser light source unit.

  By the way, in the light source device, the laser light is absorbed by the optical film of the optical system (for example, the antireflection film applied to the end surface of the lens or the optical fiber, the dielectric multilayer film forming the dichroic mirror, etc.), and the optical film is damaged. To do. As a result, there is a problem in that the transmittance of the optical system is lowered as the usage time elapses.

  Also, in the vicinity of the condensing point where the laser beam is condensed at a high energy density (for example, the incident surface of the optical fiber), the laser beam reacts with an organic substance (for example, siloxane generated as a gas from the adhesive). Therefore, foreign matters (for example, silica-based deposits, etc.) are deposited on the surface of the optical system near the condensing point. As a result, there is a problem that the transmittance of the optical system is lowered as the usage time elapses.

Japanese Patent No. 4858182 Japanese Patent No. 5180086

  Therefore, in view of such circumstances, the present invention is a light source that can output light stably and can simplify the configuration against a decrease in transmittance of the optical system over time. It is an object to provide an apparatus.

  In order to solve such a problem, the inventor has found that the transmittance of the optical system decreases with time in light having a short wavelength, whereas the transmittance of the optical system decreases with time in light having a long wavelength. I found it even maintained. Thereby, the inventor invented the following light source device.

  A light source device according to the present invention includes a laser light source unit that emits light of a predetermined wavelength, and at least one other laser light source unit that is different from the laser light source unit that emits light of another wavelength different from the predetermined wavelength. A coupling optical system that couples light emitted from the plurality of laser light source units, a light amount detection unit that detects a light amount of the predetermined wavelength from the light coupled by the coupling optical system, and the laser light sources A control unit that controls a current value flowing through each laser light source unit in order to control the output of the unit, and the control unit includes a light amount detected by the light amount detection unit and a light amount setting value of the light having the predetermined wavelength. And controlling the current value of the laser light source unit that emits light of the predetermined wavelength based on the at least one value among the detected light amount, the light amount setting value, and the current value. Emit light of the wavelength Serial to control the current value of the other laser light source unit.

  According to the light source device of the present invention, the light amount detection unit detects the light amount of light having a predetermined wavelength from the light combined by the coupling optical system, and the control unit detects the light amount detected by the light amount detection unit and the predetermined wavelength. The current value of the laser light source unit that emits a predetermined wavelength is controlled based on the light amount setting value. Thereby, the light of a predetermined wavelength whose transmittance decreases with time is emitted from the laser light source unit in a set amount of light.

  In addition, the control unit is configured based on at least one of the light amount detected by the light amount detection unit, the light amount setting value of light of a predetermined wavelength, and the current value of the laser light source unit that emits light of the predetermined wavelength. The current value of another laser light source unit that emits light of a wavelength is controlled. As a result, light of other wavelengths whose transmittance is maintained over time has a color balance (white balance) with respect to a desired amount of light of a predetermined wavelength (predetermined color) from other laser light source units. The amount of light that is kept is emitted. Therefore, stable light output can be performed against a decrease in the transmittance of the optical system over time.

  Moreover, the light amount detection unit detects only the light amount of light of a predetermined wavelength without detecting all the light amounts of light of each wavelength from the light combined by the coupling optical system, so that the transmission of the optical system over time can be achieved. Stable light output can be performed as the rate decreases. Therefore, the configuration of the light source device according to the present invention can be simplified as compared with the configuration of detecting all the light amounts of the respective wavelengths.

  In the light source device according to the present invention, the control unit controls a current value of the other laser light source unit that emits light of the other wavelength based only on the light amount detected by the light amount detection unit. The structure of, may be used.

  Moreover, in the light source device according to the present invention, the control unit includes the other laser light source unit that emits light of the other wavelength based only on a current value of the laser light source unit that emits the predetermined wavelength. It may be configured to control the current value.

  In the light source device according to the present invention, the control unit controls a current value of the other laser light source unit that emits light of the other wavelength based only on a light amount setting value of the light of the predetermined wavelength. It may be configured to do.

  Moreover, in the light source device according to the present invention, the control unit controls current values of the plurality of laser light source units at a predetermined period, and outputs current values of the other laser light source units that emit light of the other wavelengths. The control period may be longer than the control period of the current value of the laser light source unit that emits light of the predetermined wavelength.

  In the light source device according to the present invention, the light having the predetermined wavelength may be light having the shortest wavelength among the light emitted from the plurality of laser light source units.

  As described above, the light source device according to the present invention can output light stably with respect to a decrease in the transmittance of the optical system over time, and can simplify the configuration. Excellent effect.

FIG. 1 is a schematic configuration diagram of a light source device according to an embodiment of the present invention. FIG. 2 is a control block diagram of the light source device according to the embodiment. FIG. 3 is a graph showing the relationship of the current value of the second laser light source with respect to the amount of B light (first wavelength light) according to the embodiment. FIG. 4 is a graph showing the relationship of the current value of the third laser light source with respect to the amount of B light (first wavelength light) according to the embodiment. FIG. 5 is a control flow diagram of the light source device according to the embodiment. FIG. 6 is a graph showing the relationship of the current value of the second laser light source with respect to the light amount setting value of B light according to another embodiment of the present invention. FIG. 7 is a graph showing the relationship between the current value of the third laser light source and the light amount setting value of B light according to the embodiment. FIG. 8 is a control block diagram of a light source device according to still another embodiment of the present invention. FIG. 9 is a table showing the relationship of the transmittance with respect to the cumulative operation time according to the embodiment. FIG. 10 is a graph showing the relationship of the transmittance with respect to the cumulative operation time according to the embodiment. FIG. 11 is a graph showing the current value of the second laser light source with respect to the current value of the first laser light source according to the embodiment. FIG. 12 is a graph showing the current value of the third laser light source with respect to the current value of the first laser light source according to the embodiment.

  Hereinafter, an embodiment of a light source device according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the light source device 10 according to the present embodiment is an image projection device. The light source device 10 includes a first laser light source unit (also referred to as “reference laser light source unit”) 1 that emits light having a first wavelength (“predetermined wavelength” according to the present invention), a first wavelength, A second laser light source unit 2 (an “other laser light source unit” according to the present invention) 2 that emits light having a different second wavelength, and a third laser beam that emits light having a third wavelength different from the first and second wavelengths. 3 laser light source sections (“other laser light source sections” according to the present invention) 3.

  The light source device 10 includes a coupling optical system 4 that couples light emitted from the plurality of laser light source units 1, 2, and 3, and a projection lens, for example. And an optical image projection mechanism 5 for enlarging and projecting onto the screen 9. Further, the light source device 10 includes a light amount detection unit 6 that detects the amount of light having the first wavelength from the light coupled by the coupling optical system 4, and outputs (light amounts to be emitted) of the laser light source units 1, 2, and 3. And a control unit 7 for controlling the information and an input unit 8 for inputting various information.

  The first laser light source unit 1 includes a plurality of (three shown in FIG. 1) semiconductor lasers 11 that emit laser light, and a plurality (FIG. 1) that converts the laser light emitted from the semiconductor laser 11 into parallel light. 3, three collimating lenses 12 are shown. Further, the first laser light source unit 1 includes a drive unit 13 that supplies the current value controlled by the control unit 7 to each semiconductor laser 11 with a constant current in order to drive each semiconductor laser 11.

  The first laser light source unit 1 emits light having a shorter wavelength than the light emitted from the second and third laser light source units 2 and 3. In the present embodiment, the first laser light source unit 1 emits light having a wavelength of 400 nm to 480 nm from each semiconductor laser 11. Thus, the first laser light source unit 1 emits blue light (hereinafter also referred to as “B light”). Each semiconductor laser 11 may emit light having the same wavelength, and may emit light having different wavelengths within the above range.

  The second laser light source section 2 includes a plurality of (three shown in FIG. 1) semiconductor lasers 21 that emit laser light, and a plurality of laser beams emitted from the semiconductor laser 21 (FIG. 1). 3, three collimating lenses 22 are shown. In addition, the second laser light source unit 2 includes a drive unit 23 that supplies a current value controlled by the control unit 7 to each semiconductor laser 21 with a constant current in order to drive each semiconductor laser 21.

  The second laser light source unit 2 emits light having a longer wavelength than the light emitted from the first and third laser light source units 1 and 3. In the present embodiment, the second laser light source unit 2 emits light having a wavelength of 620 nm to 750 nm from each semiconductor laser 21. Accordingly, the second laser light source unit 2 emits red light (hereinafter also referred to as “R light”). Each semiconductor laser 21 may emit light having the same wavelength, or may emit light having different wavelengths within the above range.

  The third laser light source unit 3 includes a plurality of (three shown in FIG. 1) semiconductor lasers 31 that emit laser light, and a plurality of laser beams emitted from the semiconductor laser 31 (FIG. 1). 3, three collimating lenses 32 are shown. In addition, the third laser light source unit 3 includes a drive unit 33 that supplies the current value controlled by the control unit 7 to each semiconductor laser 31 with a constant current in order to drive each semiconductor laser 31.

  The third laser light source unit 3 emits light having a longer wavelength than the light emitted from the first laser light source unit 1 and having a shorter wavelength than the light emitted from the second laser light source unit 2. To do. In the present embodiment, the third laser light source unit 3 emits light having a wavelength of 495 nm to 570 nm from each semiconductor laser 31. Accordingly, the third laser light source unit 3 emits green light (hereinafter also referred to as “G light”). Each semiconductor laser 31 may emit light having the same wavelength, or may emit light having different wavelengths within the above range.

  The coupling optical system 4 includes condensing lenses 41, 41, 41 that condense light emitted from the laser light source units 1, 2, 3, and an optical fiber 42 into which the light emitted from each condensing lens 41 is incident. , 42, 42. Further, the coupling optical system 4 includes a color synthesis optical member 43 that synthesizes the light emitted from the optical fibers 42 and a spatial modulation element 44 that converts the synthesized light emitted from the color synthesis optical member 43 into an optical image. Yes.

  Each optical fiber 42 is arranged so that the incident surface is located at the focal position of each condenser lens 41. The color combining optical member 43 is made of, for example, a color combining prism such as a dichroic prism, and the spatial modulation element 44 is made of, for example, a digital micromirror device or a liquid crystal display device.

  The light amount detection unit 6 detects an amount of light that has passed through the optical filter 61 and an optical filter 61 that can transmit light in a specific wavelength range in order to detect the amount of light of B light out of the light reflected by the screen 9. And a detection sensor 62. Such an optical filter 61 transmits only light having a wavelength of 480 nm or less, for example, so as to transmit only B light out of the light reflected by the screen 9 while not transmitting R light and G light. It is configured.

  The control unit 7 includes a storage unit 71 that stores various types of information, and a calculation unit 72 that calculates current values to be passed to the laser light source units 1, 2, and 3 based on the information stored in the storage unit 71. I have. In addition, the control unit 7 includes a current value control unit 73 that controls a current value flowing through each of the laser light source units 1, 2, 3 based on the current value calculated by the calculation unit 72.

  The storage unit 71 includes a set value storage unit 71a that stores a light amount setting value of B light for each mode (for example, a normal mode, an energy saving mode, or the like) input by the input unit 8. In addition, the storage unit 71 includes a current value information storage unit 71b that stores information on current values to be passed through the second and third laser light source units 2 and 3 with respect to the amount of B light (light having the first wavelength). Yes.

  As shown in FIG. 3, the current value to be passed through the second laser light source unit 2 stored in the current value information storage unit 71b is an R light whose color balance (white balance) is maintained with respect to the amount of B light. Is a current value for outputting the amount of light. As shown in FIG. 4, the current value to be passed through the third laser light source unit 3 stored in the current value information storage unit 71 b is G light whose color balance (white balance) is maintained with respect to the amount of B light. Is a current value for outputting the amount of light.

  The calculation unit 72 includes a setting value selection unit 72a that selects a light amount setting value of B light corresponding to the mode selected by the input unit 8 among the light amount setting values stored in the setting value storage unit 71a. . In addition, the calculation unit 72 includes a detection value determination unit 72b that determines whether or not the light amount detected by the light amount detection unit 6 is the light amount setting value selected by the setting value selection unit 72a. Further, the calculation unit 72 includes a current value calculation unit 72c that calculates a current value flowing through each of the laser light source units 1, 2, and 3.

  The current value calculation unit 72c flows to the first laser light source unit 1 that emits the B light based on the light amount of the B light detected by the light amount detection unit 6 and the light amount setting value selected by the setting value selection unit 72a. Calculate the current value. Specifically, the current value calculation unit 72c calculates the current value to be small when the detected light amount is larger than the light amount set value, and the current value when the detected light amount is smaller than the light amount set value. Is calculated to be larger.

  In addition, the current value calculation unit 72c is configured to output a current value to be supplied to the second laser light source unit 2 that emits R light and a third laser light source that emits G light based on the light amount of B light detected by the light amount detection unit 6. The value of the current flowing through the unit 3 is calculated. Specifically, the current value calculation unit 72c calculates a current value to be supplied to each laser light source unit 2 and 3 based on the detected light amount of the B light and information stored in the current value information storage unit 71b. To do.

  The current value control unit 73 controls the laser light source units 1, 2, and 3 based on the current value calculated by the current value calculation unit 72c. Specifically, the current value control unit 73 is configured so that the current values flowing through the laser light source units 1, 2, and 3 become the calculated current values. 23 and 33 are controlled.

  The configuration of the light source device 10 according to the present embodiment is as described above. Next, the control of the light source device 10 according to the present embodiment will be described with reference to FIG.

  When the lighting instruction and the mode are input through the input unit 8, the set value selection unit 72a selects the light amount setting value for the B light based on the information stored in the set value storage unit 71a (step 101). . Then, after the light amount detection unit 6 detects the light amount of the B light (step 102), the detection value determination unit 72b compares the detected light amount with the selected light amount setting value (step 103).

  When the detection value determination unit 72b determines that the detected light amount of the B light is different from the light amount setting value ("N" in step 103), the current value calculation unit 72c determines that the detected light amount of the B light is The current value of the first laser light source unit 1 is calculated so as to be the light amount setting value, and the current value control unit 73 controls the first laser light source unit 1 based on the calculated current value (step 104). . The control unit 7 repeatedly controls the first laser light source unit 1 until the detected light amount of the B light reaches the light amount setting value (return to step 102 and repeat steps 103 and 104).

  When the detection value determination unit 72b determines that the detected light amount of the B light is equal to the light amount setting value ("Y" in step 103), the current value calculation unit 72c detects the detected B light. Based on the light amount and the information stored in the current value information storage unit 71b, the current values of the second and third laser light source units 2 and 3 are calculated, and the current value control unit 73 calculates the calculated current value. Based on this, the second and third laser light source units 2 and 3 are controlled (step 105).

  Then, when the predetermined time has elapsed (“Y” in step 106), the light amount detection unit 6 detects the light amount of the B light, and the above control is repeated (return to step 102 and repeat steps 102 to 105). ). That is, the control unit 7 controls the current values of the laser light source units 1, 2, and 3 at a predetermined period.

  As described above, according to the light source device 10 according to the present embodiment, the light amount detection unit 6 detects the light amount of the B light from the light combined by the coupling optical system 4, and the control unit 7 includes the light amount detection unit 6. The current value of the first laser light source unit 1 that emits the B light is controlled based on the detected light amount and the light amount setting value of the B light. Thereby, the B light whose transmittance decreases with time is emitted from the first laser light source unit 1 at a light amount set value.

  In the R light and G light, which are light having a long wavelength, the transmittance of the optical system is maintained over time, so that the current value passed through the second and third laser light source units 2 and 3 And the relationship with the light quantity of the light radiate | emitted from the 3rd laser light source parts 2 and 3 is maintained also with time. Using this, the control unit 7 controls the current values of the second and third laser light source units 2 and 3 that emit R light and G light based on the light amount detected by the light amount detection unit 6.

  As a result, the R light and G light whose transmittance is maintained over time have a high light quantity that maintains a color balance (white balance) with respect to the light quantity of B light from each laser light source unit 2 and 3. It is emitted with accuracy. Therefore, stable light output can be performed against a decrease in the transmittance of the optical system over time.

  In addition, the light amount detection unit 6 detects only the light amount of the B light from the light combined by the coupling optical system 4 without detecting the light amount of the R light and the G light, so that the transmission of the optical system over time can be achieved. Stable light output can be performed as the rate decreases. Therefore, the configuration of the light source device 10 according to the present embodiment can be simplified as compared with the configuration in which all the amounts of R light, G light, and B light are detected.

  The light source device according to the present invention is not limited to the configuration of the above-described embodiment, and is not limited to the above-described effects. In addition, the light source device according to the present invention can be variously modified without departing from the gist of the present invention. For example, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.

  In the light source device 10 according to the above-described embodiment, the control unit 7 includes the second and third laser light source units 2 that emit R light and G light based only on the B light amount detected by the light amount detection unit 6. The current value of 3 is controlled. However, the light source device according to the present invention is not limited to such a configuration. In short, in the light source device according to the present invention, the control unit 7 determines the light amount of the B light detected by the light amount detection unit 6, the light amount setting value of the B light, and the current value of the first laser light source unit 1 that emits the B light. Of these, the current values of the second and third laser light source units 2 and 3 that emit R light and G light are controlled based on only one value, two values, or all three values. Good.

  For example, in the light source device according to the present invention, as shown in FIGS. 6 and 7, the control unit 7 performs the R light and G light (others) based only on the light amount setting value of the B light (light of a predetermined wavelength). It is also possible to control the current values of the second and third laser light source units 2 and 3 that emit light having a wavelength of (2). Moreover, in the light source device according to the present invention, as shown in FIGS. 8 to 12, the control unit 7 is based only on the current value of the first laser light source unit 1 that emits B light (light of a predetermined wavelength). The current values of the second and third laser light source units 2 and 3 that emit R light and G light (light of other wavelengths) may be controlled.

  Here, the modified light source device 10 according to FIGS. 6 and 7 will be described.

  As shown in FIGS. 6 and 7, the current value information storage unit 71 b of the storage unit 71 flows to the second and third laser light source units 2 and 3 for the light amount setting value of the B light (first wavelength light). Information on the power value to be stored is stored. As shown in FIGS. 6 and 7, the current value to be passed through the second and third laser light source units 2 and 3 stored in the current value information storage unit 71b is a color balance (white) with respect to the amount of B light. This is a current value for outputting the light amounts of R light and G light that are kept in balance.

  Then, the current value calculation unit 72c of the calculation unit 72 is configured to output a current value to be supplied to the second laser light source unit 2 that emits R light and a third laser light source unit 3 that emits G light based on the light amount setting value of B light. And the current value to be passed through. Specifically, the current value calculation unit 72c calculates a current value to be supplied to each laser light source unit 2 and 3 based on the light amount setting value of B light and information stored in the current value information storage unit 71b. .

  Here, in the R light and G light, which are light having a long wavelength, the transmittance of the optical system is maintained over time, so that the value of the current passed through the second and third laser light source units 2 and 3 The relationship between the amount of light emitted from the second and third laser light source units 2 and 3 is maintained over time. Using this, the control unit 7 controls the current values of the second and third laser light source units 2 and 3 that emit the R light and the G light based on the light amount setting value of the B light. In addition, the electric current value of the 1st laser light source part 1 is controlled by the control content similar to the said embodiment.

  As described above, according to the configuration according to FIGS. 6 and 7, the R light and G light whose transmittance is maintained over time are controlled to the light amount setting values from the laser light source units 2 and 3. The amount of light that maintains the color balance (white balance) with respect to the amount of B light is emitted with high accuracy. Therefore, it is possible to output light stably with respect to a decrease in transmittance of the optical system with time, and to simplify the configuration.

  Next, a modified light source device 100 according to FIGS. 8 to 12 will be described.

  As illustrated in FIG. 8, the control unit 70 further includes a cumulative operation measurement unit 74 that measures the cumulative time during which the control unit 7 according to the embodiment is operated. In addition, the storage unit 710 stores information on the transmittance of the optical system in each wavelength of light (light of the first to third wavelengths) with respect to the accumulated operation time with respect to the storage unit 71 according to the embodiment. A rate information storage unit 71c is further provided.

  As shown in FIGS. 9 and 10, the transmittance information storage unit 71c stores information on the transmittance of each optical system in the R light, the G light, and the B light. For example, when the cumulative operation time is 10,000 hours, when the initial transmittance is 100, the transmittance of the optical system for R light and G light is 100, and the transmittance of the optical system for B light is 82. (= 100 × 0.98 × 0.85 × 0.98). As described above, in the light having a long wavelength, the transmittance of the optical system is maintained over time, whereas in the light having a short wavelength, the transmittance of the optical system is decreased with time.

  As shown in FIGS. 11 and 12, the current value information storage unit 71 b of the storage unit 71 stores current values to be supplied to the second and third laser light source units 2 and 3 with respect to the initial current value of the first laser light source 1. Information (solid line information in FIGS. 11 and 12) is stored. As shown in FIGS. 11 and 12, the current value to be passed through the second and third laser light source units 2 and 3 stored in the current value information storage unit 71b is a color balance (white) with respect to the amount of B light. This is a current value for outputting the light amounts of R light and G light that are kept in balance.

  The current value calculation unit 72c of the calculation unit 72 performs measurement based on the cumulative operation time measured by the cumulative operation measurement unit 74 and the information on the transmittance of the optical system of each light stored in the transmittance information storage unit 71c. Information on the current value to be passed through the second and third laser light source units 2 and 3 with respect to the current value of the first laser light source unit 1 during the accumulated operation time is calculated (broken line information in FIGS. 11 and 12). Then, the current value calculation unit 72 c calculates the current value to be passed through each laser light source unit 2, 3 based on the current value information and the current value of the first laser light source unit 1.

  Here, in the R light and G light, which are light having a long wavelength, the transmittance of the optical system is maintained over time, so that the value of the current passed through the second and third laser light source units 2 and 3 The relationship between the amount of light emitted from the second and third laser light source units 2 and 3 is maintained over time. Using this, the control unit 7 controls the current values of the second and third laser light source units 2 and 3 that emit R light and G light based on the current value of the first laser light source unit. In addition, the electric current value of the 1st laser light source part 1 is controlled by the control content similar to the said embodiment.

  As described above, according to the configuration according to FIGS. 8 to 12, the R light and the G light whose transmittance is maintained even with lapse of time from the laser light source units 2 and 3 with respect to the light amount of the B light. The amount of light that maintains the color balance (white balance) is emitted. Therefore, it is possible to output light stably with respect to a decrease in transmittance of the optical system with time, and to simplify the configuration.

  Note that the light source device 100 according to FIGS. 8 to 12 may not include the transmittance information storage unit 71c. In such a configuration, the current value information storage unit 71b of the storage unit 71 accumulates information on current values to be supplied to the second and third laser light source units 2 and 3 with respect to the current value of the first laser light source unit 1. Each is stored corresponding to the operating time.

  In the light source device 10 according to the above-described embodiment, the period for controlling the current values of the laser light source units 1, 2, 3 is all equal (step 106). However, the light source device according to the present invention is not limited to such a configuration. For example, in the light source device according to the present invention, the period for controlling the current values of the second and third laser light source units 2 and 3 that emit R light and G light (light of other wavelengths) is B light (predetermined). The structure may be longer than the period for controlling the current value of the first laser light source unit 1 that emits light of a wavelength.

  According to such a configuration, the first laser light source unit 1 that emits B light whose transmittance of the optical system decreases with time is controlled in a short cycle, and the transmittance of the optical system is maintained even with time. The second and third laser light source units 2 and 3 that emit the R light and the G light are controlled in a long cycle. Therefore, the timing to control can be made appropriate.

  Moreover, in the light source device 10 which concerns on the said embodiment, it is the structure that the three laser light source parts 1, 2, and 3 are provided. However, the light source device according to the present invention is not limited to such a configuration. For example, the light source device according to the present invention may have a configuration in which two or four or more laser light source units are provided. In short, the optical device according to the present invention includes a laser light source unit 1 that emits light of a predetermined wavelength and at least one laser light source unit 2 and 3 that emits light of another wavelength different from the predetermined wavelength. It only has to have.

  Further, the light source device 10 according to the embodiment is configured as an image projection device. However, the light source device according to the present invention is not limited to such a configuration. For example, the light source apparatus according to the present invention may be an exposure apparatus that performs exposure using laser light.

  DESCRIPTION OF SYMBOLS 1 ... (1st) Laser light source part, 2 ... (2nd) Laser light source part, 3 ... (3rd) Laser light source part, 4 ... Coupling optical system, 5 ... Optical image projection mechanism, 6 ... Light quantity detection part, 7 DESCRIPTION OF SYMBOLS ... Control part, 8 ... Input part, 9 ... Screen, 10 ... Light source device, 11 ... Semiconductor laser, 12 ... Collimating lens, 13 ... Driving part, 21 ... Semiconductor laser, 22 ... Collimating lens, 23 ... Driving part, 31 ... Semiconductor laser 32 ... Collimating lens 33 ... Driving unit 41 ... Condensing lens 42 ... Optical fiber 43 ... Color synthesizing optical member 44 ... Spatial modulation element 61 ... Optical filter 62 ... Detection sensor 70 ... Control unit 71 ... storage unit, 71a ... set value storage unit, 71b ... current value information storage unit, 71c ... transmittance information storage unit, 72 ... calculation unit, 72a ... set value selection unit, 72b ... detection value determination unit, 72c ... Current value calculation unit 73 ... Current values control unit, 74 ... accumulation operation measurement unit, 100 ... light source apparatus, 710 ... storage unit

Claims (6)

A laser light source unit that emits light of a predetermined wavelength among 400 nm to 480 nm;
Emits light having a wavelength longer than the predetermined wavelength, and differ by at least one other laser light source unit and the laser light source unit,
A coupling optical system for coupling light emitted from the plurality of laser light source units;
A light amount detector for detecting the amount of light of the predetermined wavelength from the light coupled by the coupling optical system;
A control unit for controlling a current value flowing in each laser light source unit in order to control the output of each laser light source unit;
The control unit controls the current value of the laser light source unit that emits the light of the predetermined wavelength based on the light amount detected by the light amount detection unit and the light amount setting value of the light of the predetermined wavelength. A light source device that controls a current value of the other laser light source unit that emits light having a wavelength longer than the predetermined wavelength , based on at least one of a light amount, the light amount setting value, and the current value.   The light source device according to claim 1, wherein the control unit controls a current value of the other laser light source unit that emits light of the other wavelength based only on a light amount detected by the light amount detection unit.   The said control part controls the electric current value of the said other laser light source part which radiate | emits the light of said other wavelength based only on the electric current value of the said laser light source part which radiate | emits the said predetermined wavelength. Light source device.   The light source device according to claim 1, wherein the control unit controls a current value of the other laser light source unit that emits light of the other wavelength based only on a light amount setting value of the light of the predetermined wavelength. The control unit controls current values of the plurality of laser light source units at a predetermined period,
The period for controlling the current value of the other laser light source unit that emits light of the other wavelength is longer than the period for controlling the current value of the laser light source unit that emits the light of the predetermined wavelength. The light source device according to any one of the above. The light source device according to claim 1, wherein the light having the predetermined wavelength is light having the shortest wavelength among light emitted from the plurality of laser light source units.

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