JP2021006843A - Light source device and image projection device - Google Patents

Abstract

To provide a light source device that can control a light source before a device becomes abnormal and that can prevent the device from being damaged.SOLUTION: A light source device comprises: a light source that emits excitation light; a fluorescent substrate that has a phosphor layer which emits fluorescent light due to the excitation light being emitted; a motor that rotates the fluorescent substrate; acquisition means that acquires a rotational frequency of the fluorescent substrate; and control means that controls supply power of the light source, on the basis of driving voltage of the motor and the rotational frequency acquired by the acquisition means.SELECTED DRAWING: Figure 1

Description

The present invention relates to a light source device and an image projection device having an excitation light source.

The image projection device displays a projected image by projecting light modulated by an optical modulation element such as a liquid crystal panel onto a projected surface such as a screen by a projection optical system. As the light source of the image projection device, an LED or a laser may be used in addition to an ultra-high pressure mercury lamp or a xenon lamp. Patent Document 1 discloses a projection device that prevents the influence of laser light when the rotation of the wheel is stopped in a configuration in which a fluorescent layer formed on the wheel is irradiated with laser light to obtain visible light to be irradiated as projected light. doing.

Patent Document 1 detects the appearance of a predetermined mark coated under the phosphor layer, determines that the phosphor layer has peeled off when the number of detections exceeds the predetermined number, and stops the generation of laser light. By doing so, it is possible to prevent the spread of damage to the device and the influence on the outside of the device due to the laser beam.

Japanese Unexamined Patent Publication No. 2011-117989

However, in Patent Document 1, it is difficult to prevent damage to the device itself because the generation of the laser beam can be stopped only after the phosphor has peeled off (the device state becomes abnormal). In particular, the damage caused by the laser beam is likely to spread instantly, and even if an attempt is made to stop the generation of the laser beam after detecting that the condition has become abnormal, the delay may damage the device. ..

Therefore, the present invention provides a light source device capable of controlling a light source before the device becomes abnormal and preventing damage to the device.

In order to solve the above problems, the light source device of the present invention comprises a light source that emits excitation light, a fluorescent substrate having a phosphor layer that emits fluorescent light when irradiated with the excitation light, and the fluorescent substrate. A rotating motor, an acquisition means for acquiring the rotation speed of the fluorescent substrate, and a control means for controlling the supply power of the light source based on the drive voltage of the motor and the rotation speed acquired by the acquisition means. It is characterized by having.

According to the present invention, it is possible to provide a light source device capable of controlling a light source before the device becomes abnormal and preventing damage to the device.

The block diagram which shows the structure of the projector which is embodiment of this invention. The block diagram which shows an example of the light source apparatus in embodiment of this invention. The block diagram which shows another example of the light source apparatus in embodiment of this invention. The flowchart of the process in 1st Example of this invention. The flowchart of the process in the 2nd Example of this invention. The flowchart of the process in 3rd Example of this invention. The figure which shows an example of the information which shows the correlation of the motor drive voltage and the substrate rotation speed of a fluorescent substrate. The figure which shows another example of the information which shows the correlation of the motor drive voltage and the substrate rotation speed of a fluorescent substrate.

Hereinafter, the projector 100 (image projection device) including the light source device 62 according to the embodiment of the present invention will be described with reference to FIG.

The video processing unit 10 is provided with terminals such as a composite terminal and an HDMI (registered trademark) terminal for inputting video signals, and a receiver IC and the like for receiving video signals input through those terminals. .. The video processing unit 10 generates a video signal that has undergone image processing such as brightness correction, contrast correction, gamma conversion, color conversion, resolution conversion, sharpening processing, and IP conversion on the input video signal.

The OSD superimposition unit 20 superimposes an OSD image on the video signal output from the video processing unit 10. The OSD image can be generated based not only on image data such as a bitmap prepared in advance, but also on a straight line, a rectangle, or a drawing instruction for each pixel.

The geometric distortion correction unit 40 performs deformation processing on the video signal output from the OSD superimposition unit 20 so as to correct the geometric distortion generated in the projected image, and for example, the projected image generated by tilt projection or the like. Distortion can be suppressed.

The panel drive unit 50 is connected to the geometric distortion correction unit 40, converts the image signal corrected by the geometric distortion correction unit 40 into a drive signal for driving the display element 66 (optical modulation element) of the optical system 60, and displays the image signal. Drives the element 66. As the display element 66, a transmissive liquid crystal panel, a reflective liquid crystal panel, a DMD (Digital Miller Device), or the like can be used.

The optical system 60 includes a light source device 62, an illumination optical system 64, a display element 66, and a projection optical system 68. The light emitted from the light source device 62 passes through the illumination optical system 64 and illuminates the display element 66. The display element 66 modulates the incident light based on the drive signal from the panel drive unit 50, and the modulated light is projected onto the screen as a projected image through the projection optical system 68.

Further, the projection optical system 68 can move the position of the lens or unit by a motor or the like, and can perform optical zoom (enlargement and reduction of the projection image) and optical shift (movement of the projection position).

The operation unit 70 includes a button for inputting an operation by the user and an infrared light receiving unit for receiving infrared rays from the remote controller, and converts the input operation into an electric signal. Types of operations include decision and cancellation, menu calling for making various settings, up / down / left / right direction instructions, power control, and the like.

The CPU 30 is connected to a large number of devices (not shown) including a video processing unit 10, an OSD superimposing unit 20, a geometric distortion correction unit 40, an operation unit 70, a projection optical system 68, and a temperature sensor and a fan. The CPU 30 is a microcomputer that controls the power supply and the state of each part of the projector 100. For example, by receiving a user's operation input from the operation unit 70, controlling the OSD superimposition unit 20 to display a menu screen, and controlling the image processing unit 10, the geometric distortion correction unit 40, and the projection optical system 68, Control according to the operation. In addition, the state and function of each part are controlled, the state is acquired, and the like, for example, when an abnormality in the internal state is detected, processing such as power shutoff, cooling control, and warning to the user is performed.

FIG. 2 is a block diagram showing an example of the light source device 62.

The laser diode 120 (light source) is capable of emitting excitation light and is installed so as to irradiate the fluorescence substrate 140. The fluorescent substrate 140 is provided with a phosphor layer 141 on the substrate and is installed so as to be rotated by a motor 130. When the excitation light is irradiated from the laser diode 120, the fluorescent substrate 140 emits fluorescent light on the opposite surface side, and the fluorescent light is emitted toward the illumination optical system 64.

FIG. 3 is a block diagram showing another example of the light source device 62.

The laser diode 120 (light source) is installed so as to irradiate the generated excitation light toward the fluorescent substrate 140. The fluorescent substrate 140 is provided with a phosphor layer 141 and a reflective layer (not shown) on the substrate. It is installed so as to be rotated by the motor 130. When the excitation light is irradiated from the laser diode 120, the fluorescence substrate 140 emits fluorescence light on the same surface side, and the fluorescence light is reflected by the dichroic mirror 180 that transmits the excitation light and reflects the fluorescence light, and is reflected by the illumination optical system 64. It is emitted toward.

In each of the embodiments described below, the light source device 62 can use any of the light source devices of FIG. 2 or FIG.

The light source device 62 has a built-in CPU 110 (control unit). The CPU 110 controls the laser diode 120 and sets the supplied power as normally used power (first power), extinguishing power (second power), dimming power (third power), and the like. , The output of excitation light can be controlled. Further, the motor 130 (drive source) can be controlled to control the rotation speed of the fluorescent substrate 140.

Further, the CPU 110 is connected to a photointerruptor 160 (acquisition means), a CPU 30, and a large number of devices (not shown), which are sensors for detecting the rotation speed of the fluorescent substrate 140, and controls each part while controlling the internal state. It also performs processing when an abnormality is detected. Further, by controlling the drive voltage of the motor 130 based on the detection result of the rotation speed, the constant rotation speed control of the fluorescent substrate 140 is also performed. The CPU 30 and the CPU 110 may be integrated and controlled by one CPU.

The memory (storage unit) 170 stores the control program of the CPU 110, information showing the correlation between the motor drive voltage of the motor 130 and the substrate rotation speed of the fluorescent substrate 140 as shown in FIGS. 7 and 8, and statistical information of temporal changes. Remember.

A rotation detection marker 150 is provided on the fluorescent substrate 140, and the light output from the photo interrupter 160 is reflected by the rotation detection marker 150. That is, the intensity of the reflected light can be detected by the photo interrupter 160, and the number of rotations of the fluorescent substrate 140 per unit time can be detected from the number of detections.

Various methods other than this embodiment can be used to detect the rotation speed of the fluorescent substrate 140. For example, by providing a slit disk on the rotation axis of the motor 130 and passing it through a photo interrupter, a rotation pulse signal is generated every time the motor rotates by a predetermined angle (pulse generation means). The rotation speed of the motor 130 may be calculated by detecting the interval of the pulse signals per unit time, and the calculated rotation speed may be detected as the rotation speed of the fluorescent substrate 140. In addition, a sensor that measures the intensity of fluorescent light is provided, and the intensity distribution of fluorescent light per unit time when the fluorescent substrate is rotating at a predetermined rotation speed and the current intensity distribution of fluorescent light per unit time are used. , The rotation speed of the fluorescent substrate 140 may be detected.

FIG. 4 shows a flowchart for explaining the control operation of the laser diode 120 in the light source device 62 according to the first embodiment. This process is executed by the CPU 110 according to a computer program (light source control program). Here, it is assumed that the flow shown in FIG. 4 is executed at predetermined time intervals (for example, every 1 millisecond) after the light source is turned on.

When the process is started, in step S10, the CPU 110 acquires the rotation speed of the fluorescent substrate 140 detected by the photo interrupter 160. It is determined whether or not the acquired rotation speed is less than the stop threshold value (second threshold value). As for the stop threshold, as the rotation speed of the fluorescent substrate 140 becomes low, the excitation light from the laser diode 120 is irradiated to the same region of the fluorescent substrate 140 for a long time, and for example, the fluorescent substrate 140 may become hot and damaged. Set the number of revolutions at which the property is high.

If it is determined that the acquired rotation speed is equal to or less than the stop threshold value, the process proceeds to step S30, and if it is determined to be greater than the stop threshold value, the process proceeds to step S20.

In step S20, the CPU 110 acquires the drive voltage that drives the motor 130. Then, fluorescence is obtained from the information showing the correlation between the motor drive voltage of the motor 130 and the substrate rotation number of the fluorescent substrate 140 stored in the memory 170, and the rotation number of the fluorescent substrate 140 and the drive voltage of the motor 130 acquired in step 10. The state (rotational state) of the substrate 140 is determined.

As the determination, a determination based on the drive voltage and a determination based on the rotation speed can be used. In step S20, either a determination based on the drive voltage or a determination based on the rotation speed is performed.

In the case of determination based on the drive voltage, when the current drive voltage of the motor 130 is A (V), the information showing the correlation shown in FIG. 7 (the predetermined range shown by the dotted line with reference to the reference relationship shown by the solid line) is shown. Information), the rotation speed range corresponding to the drive voltage A is derived. Then, it is confirmed whether or not the acquired rotation speed of the fluorescent substrate 140 is included in the derived rotation speed range. If it is included in the rotation speed range, it is determined that the current fluorescent substrate 140 is normal, and this flow ends. If it is not included in the rotation speed range, it is determined that the current rotation of the fluorescent substrate 140 is likely to cause an abnormality, and the process proceeds to step S40.

In the case of determination based on the rotation speed, when the current rotation speed of the fluorescent substrate 140 is B (rpm), the drive voltage range corresponding to the rotation speed B is derived from the information showing the correlation shown in FIG. It is confirmed whether or not the drive voltage of the motor 130 is included in the drive voltage range. If it is included in the drive voltage range, it is determined that the current fluorescent substrate 140 is normal, and this flow ends. If it is not included in the drive voltage range, the current fluorescent substrate 140 determines that an abnormality is likely to occur, and proceeds to step S40.

In step S30, the CPU 110 supplies the laser diode 120 with a second electric power, stops the output of the excitation light, and ends this flow. In step S30, since damage may have started to occur as described above, the output of the excitation light is stopped with the highest priority.

In step S40, the CPU 110 supplies the second electric power in the same manner as in step 30, stops the output of the excitation light of the laser diode 120, and ends this flow. In step S40, the rotation speed is higher than the rotation speed at which the possibility of damage is high, but the drive voltage for the rotation speed is out of the drive voltage range, or the rotation speed at the current drive voltage is out of the rotation speed range. In this situation, there are signs that the rotation of the motor 130 and the abnormality of the fluorescent substrate 140 have occurred. Therefore, in order to prevent damage, the output of the excitation light is stopped as in step 30.

As described above, the projector of this embodiment detects the rotation speed of the fluorescent substrate, and immediately stops the output of the excitation light if there is an abnormality in the rotation speed. Further, by stopping the output of the excitation light based on the relationship between the rotation speed of the fluorescent substrate and the drive voltage of the motor, damage to the device can be prevented.

FIG. 5 shows a flowchart for explaining the control operation of the laser diode 120 in the light source device 62 according to the second embodiment. This process is executed by the CPU 110 according to a computer program (control program). Here, it is assumed that the flow shown in FIG. 5 is executed at predetermined time intervals (for example, every 1 millisecond) after the light source is turned on. The difference from the first embodiment is that step 20 is replaced with step 120 and step 50 is added. Further, the description of the same reference numerals as those in the first embodiment will be omitted.

In step S120, the CPU 110 is based on the information indicating the correlation between the motor drive voltage and the substrate rotation speed stored in the memory 170 as in the first embodiment, and the rotation speed of the fluorescent substrate 140 and the drive voltage of the motor 130. Determine the state of the fluorescent substrate.

As the determination, the determination based on the drive voltage and the determination based on the rotation speed can be used as in the first embodiment. In step S120, either a determination based on the drive voltage or a determination based on the rotation speed is performed.

In the case of determination based on the drive voltage, when the current drive voltage of the motor 130 is A (V), the second rotation speed range corresponding to the drive voltage A and the second rotation speed range from the information showing the correlation shown in FIG. Derivation of the rotation speed range of 1. It is confirmed whether or not the rotation speed of the fluorescent substrate 140 is included in the derived first and second rotation speed ranges. When it is not included in the second rotation speed range and is included in the first rotation speed range, the deviation from the reference relationship is larger than that in the case where it is included in the second rotation speed range. It is determined that the rotation of the fluorescent substrate 140 shows a sign that an abnormality occurs, and the process proceeds to step S50. If it is not included in the first rotation speed range, it is determined that the current rotation of the fluorescent substrate 140 is likely to cause an abnormality, and the process proceeds to step S40. Further, when it is included in the second rotation speed range, it is determined that the current rotation of the fluorescent substrate 140 is normal, and this flow is terminated.

In the case of determination based on the rotation speed, when the current rotation speed of the fluorescent substrate 140 is B (rpm), the second drive voltage range corresponding to the rotation speed B and the second drive voltage range corresponding to the rotation speed B are obtained from the information showing the correlation shown in FIG. The first drive voltage range is derived. It is confirmed whether or not the drive voltage of the motor 130 is included in the derived first and second drive voltage ranges. When it is not included in the second drive voltage and is included in the first drive voltage range, the deviation from the reference relationship is larger than that in the case where it is included in the second drive voltage range, so that the current fluorescent substrate 140 It is determined that the rotation of the above indicates a sign that an abnormality has occurred, and the process proceeds to step S50. If it is not included in the first drive voltage range, it is determined that the current rotation of the fluorescent substrate 140 is likely to cause an abnormality, and the process proceeds to step S40. Further, when it is included in the second drive voltage range, it is determined that the current rotation of the fluorescent substrate 140 is normal, and this flow is terminated.

In step S50, the CPU 110 supplies the laser diode 120 with a third electric power, sets the laser diode 120 to weaken the output of the excitation light, and ends this flow. In step S50, there are signs that the state changes to an abnormal state. Therefore, instead of stopping the output of the excitation light immediately, the output of the excitation light is weakened in order to secure a grace period for dealing with the change to an abnormal state.

As described above, the projector of this embodiment detects the rotation speed of the fluorescent substrate, and immediately stops the output of the excitation light if there is an abnormality in the rotation speed. Further, damage can be prevented by stopping or weakening the output of the excitation light based on the relationship between the rotation speed and the drive voltage of the motor.

FIG. 6 shows a flowchart for explaining the control operation of the laser diode 120 in the light source device 62 according to the third embodiment. This process is executed by the CPU 110 according to a computer program (control program). Here, it is assumed that the flow shown in FIG. 6 is started at predetermined time intervals (for example, every 1 millisecond) after the light source is turned on. The difference from the first embodiment is that step 120 is replaced with step 220 and step 50 is added. Further, the description of the same reference numerals as those in the first embodiment will be omitted.

In the present embodiment, the rotational state of the fluorescent substrate 140 is determined based on the temporal change of the rotation speed of the fluorescent substrate 140 and the drive voltage of the motor 130.

In step S220, the CPU 110 determines the state of the fluorescent substrate in the same manner as in step 20 of the first embodiment. When it is determined that an abnormality is likely to occur, the result is stored in the memory 170, and the cumulative number of times when it is determined that the abnormality is likely to occur is read, incremented, and stored in the memory 170. It is assumed that the cumulative number of times is reset to 0 when the power of the projector is turned on (projection is started). If the cumulative number of times stored in the memory 170 is equal to or greater than the second threshold value, the process proceeds to step S40. If the cumulative number of times is less than the second threshold value and equal to or greater than the first threshold value, the process proceeds to step S50. Further, when the cumulative number of times is less than the first threshold value, the present flow is terminated.

In the present embodiment, the state of the fluorescent substrate is determined by the cumulative number of times, but the determination results are stored in the memory 170 as "0: normal" and "1: there is a high possibility that an abnormality will occur", and "1" is displayed. The state of the fluorescent substrate may be determined using the number of consecutive times, the first threshold value, and the second threshold value. That is, when the state in which the abnormality is likely to occur continues for a predetermined time, the light source may be dimmed or turned off, assuming that the abnormality is likely to occur.

In the present embodiment, two threshold values are used, but if one threshold value is used and the cumulative number of times or the number of consecutive times is less than the threshold value, this flow may be terminated, and if it is equal to or more than the threshold value, the process may proceed to step S40.

In addition, the rotation speed and drive voltage acquired in a predetermined time are stored in the memory, and the current information and statistics are obtained from statistical information indicating whether the time change of the rotation speed and drive voltage is normal or abnormal, for example, by calculation such as the least squares method. The information may be compared and the state of the fluorescent substrate may be determined based on the similarity.

As described above, the projector of this embodiment detects the rotation speed of the fluorescent substrate, and immediately stops the output of the excitation light if there is an abnormality in the rotation speed. Further, damage can be prevented by stopping or weakening the output of the excitation light from the temporal change of the rotation speed and the driving voltage.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

In the above embodiment, the case where the output of the excitation light is controlled based on the predetermined conditions has been described. However, the user may be able to select the control conditions, for example, the amount of dimming may be arbitrarily set. Further, although the case where the voltage value itself is treated as the drive voltage has been described, the control may be performed from the relationship between the duty ratio in the so-called PWM drive, the integrated value per unit time, and the rotation speed.

The present invention is also realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiment is supplied to the system or device via a network or various storage media, and the computer (or CPU, MPU, etc.) of the system or device reads the program. This is the process to be executed.

62 Light source device 110 CPU (control means)
120 laser diode (light source)
130 motor (drive source)
140 Fluorescent substrate 160 photodiode (acquisition means)

Claims (16)

A light source that emits excitation light and
A fluorescent substrate having a phosphor layer that emits fluorescent light when irradiated with the excitation light,
A motor that rotates the fluorescent substrate and
An acquisition means for acquiring the number of rotations per unit time of the fluorescent substrate, and
A light source device comprising: a control means for controlling the power supply of the light source based on the drive voltage of the motor and the rotation speed acquired by the acquisition means. The control means derives a first drive voltage range corresponding to the rotation speed acquired by the acquisition means from information indicating the correlation between the motor drive voltage of the motor and the substrate rotation speed of the fluorescent substrate, and the first drive voltage range is derived. The light source device according to claim 1, wherein the power supply of the light source is controlled based on the drive voltage range and the drive voltage. The control means supplies the light source with a first power when the drive voltage is included in the first drive voltage range, and when the drive voltage is not included in the first drive voltage range, the control means. The light source device according to claim 2, wherein a second electric power smaller than the first electric power is supplied. It has a storage means for storing the result of determining that the drive voltage is not included in the first drive voltage range.
The control means determines whether or not the drive voltage is included in the first drive voltage range at predetermined time intervals.
The result of determination that the product is not included in the first drive voltage range is stored in the storage means.
When the cumulative number of times of the result is less than the first threshold value, the first power is supplied to the light source.
The light source device according to claim 2, wherein a second electric power smaller than the first electric power is supplied to the light source when the value is equal to or greater than the first threshold value. When the cumulative number of times of the result is equal to or more than the first threshold value and less than the second threshold value, the control means is used.
The light source device according to claim 4, wherein a third electric power larger than the second electric power and smaller than the first electric power is supplied to the light source. It has a storage means for storing the result of determining that the drive voltage is not included in the first drive voltage range.
The control means determines whether or not the drive voltage is included in the first drive voltage range at predetermined time intervals.
The result of determination that the product is not included in the first drive voltage range is stored in the storage means.
When the number of consecutive results is less than a predetermined threshold value, the first power is supplied to the light source.
The light source device according to claim 2, wherein when the value is equal to or higher than the predetermined threshold value, a second electric power smaller than the first electric power is supplied to the light source. When the number of times the result is continuous is equal to or greater than the first threshold value and less than the second threshold value, the control means supplies the light source with a third electric power larger than the second electric power and smaller than the first electric power. The light source device according to claim 6, wherein the light source device is provided. The control means derives a second drive voltage range, which is a range narrower than the first drive voltage range corresponding to the rotation speed acquired by the acquisition means, from the information indicating the correlation, and the first and first. The light source device according to claim 2, wherein the power supply of the light source is controlled based on the drive voltage range of 2 and the drive voltage. The control means supplies the light source with a first power when the drive voltage is included in the second drive voltage range.
When the drive voltage is not included in the first drive voltage range, a second power smaller than the first power is supplied.
When the drive voltage is not included in the second drive voltage range and is included in the first drive voltage range, a third power larger than the second power and smaller than the first power is supplied. The light source device according to claim 8. The first result of determining that the drive voltage is not included in the first drive voltage range and the second result of determining that the drive voltage is not included in the second drive voltage range and is included in the first drive voltage range. Has a storage means to store the results
The control means makes the determination at predetermined time intervals, and stores the first result and the second result in the storage means.
When the cumulative number of times of the first and second results is less than a predetermined threshold value, the first power is supplied to the light source.
When the cumulative number of times of the first result is equal to or greater than the predetermined threshold value, a second electric power smaller than the first electric power is supplied to the light source.
When the cumulative number of times of the first result is less than the predetermined threshold value and the cumulative number of times of the second result is equal to or more than the predetermined threshold value, the light source is larger than the second power and smaller than the first power. The light source device according to claim 8, wherein a third electric power is supplied. The first result of determining that the drive voltage is not included in the first drive voltage range and the second result of determining that the drive voltage is not included in the second drive voltage range and is included in the first drive voltage range. Has a storage means to store the results
The control means makes the determination at predetermined time intervals, and stores the first result and the second result in the storage means.
When the number of times the first result is continuous and the number of times the second result is continuous is less than a predetermined threshold value, the first electric power is supplied to the light source.
When the number of consecutive times of the first result is equal to or greater than the predetermined threshold value, a second electric power smaller than the first electric power is supplied to the light source.
When the number of times the first result is continuous is less than the predetermined threshold value and the number of times the second result is continuous is equal to or greater than the predetermined threshold value, the light source is greater than the second power and the first power. The light source device according to claim 8, wherein a smaller third electric power is supplied. The control means derives a first rotation speed range corresponding to the drive voltage from information indicating the correlation between the motor drive voltage of the motor and the substrate rotation speed of the fluorescent substrate, and the first rotation speed range and the control means. The light source device according to claim 1, wherein the power supply of the light source is controlled based on the rotation speed acquired by the acquisition means. The control means supplies the light source with a first electric power when the rotation speed is included in the first rotation speed range, and when the rotation speed is not included in the first rotation speed range, the control means. The light source device according to claim 12, wherein a second electric power smaller than the first electric power is supplied. The control means derives a second rotation speed range, which is a range narrower than the first rotation speed range corresponding to the drive voltage, from the information indicating the correlation, and is combined with the first and second rotation speed ranges. The light source device according to claim 12, wherein the power supply of the light source is controlled based on the rotation speed. Light modulation element and
The light source device according to any one of claims 1 to 14, which emits light that illuminates the light modulation element.
An illumination optical system that guides the light from the light source device to the light modulation element,
An image projection apparatus including a projection optical system that projects light modulated by the light modulation element. A light source that emits excitation light, a fluorescent substrate having a phosphor layer that emits fluorescent light when irradiated with the excitation light, a motor that rotates the fluorescent substrate, a driving voltage of the motor, and the fluorescent substrate. A computer program that operates a computer of a light source device having an acquisition means for acquiring the number of revolutions.
On the computer
A light source control program characterized in that the supply power of the light source is controlled based on the drive voltage and the rotation speed acquired by the acquisition means.

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