WO2018116414A1 - Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue - Google Patents

Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue Download PDF

Info

Publication number
WO2018116414A1
WO2018116414A1 PCT/JP2016/088147 JP2016088147W WO2018116414A1 WO 2018116414 A1 WO2018116414 A1 WO 2018116414A1 JP 2016088147 W JP2016088147 W JP 2016088147W WO 2018116414 A1 WO2018116414 A1 WO 2018116414A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
index signal
rotation
abnormality detection
detection device
Prior art date
Application number
PCT/JP2016/088147
Other languages
English (en)
Japanese (ja)
Inventor
雅幸 村上
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｎｅｃディスプレイソリューションズ株式会社 filed Critical Ｎｅｃディスプレイソリューションズ株式会社
Priority to PCT/JP2016/088147 priority Critical patent/WO2018116414A1/fr
Publication of WO2018116414A1 publication Critical patent/WO2018116414A1/fr

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details

Definitions

  • the present invention relates to a wheel rotation abnormality detection device, a projector equipped with the same, and a wheel rotation abnormality detection method.
  • Some recent image projection devices include a light source device using a phosphor.
  • a light source device using a phosphor for example, there is a combination of a color wheel and a phosphor wheel.
  • FIG. 1A shows an example of a color wheel unit
  • FIG. 1B shows an example of a phosphor wheel unit.
  • the diagram on the right side of FIG. 1A is a diagram of a hollow disc-shaped color wheel 701 viewed from a direction perpendicular to the rotation surface.
  • a red filter (R), a green filter (G), a blue filter (B), and a yellow filter (Y) are each formed on the rotation surface.
  • a hollow portion 705 is formed in the central portion of the color wheel 701.
  • the left side of FIG. 1A is a side view of the color wheel unit.
  • the color wheel unit includes a color wheel 701, a color wheel motor, a marking 706, and a photo sensor 704.
  • the color wheel motor includes a cylindrical rotating body 703.
  • the hollow portion 705 of the color wheel 701 is joined to a cylindrical rotating body 703, and the color wheel 701 can be rotated by rotating the rotating body 703.
  • the color wheel 701 rotates around a rotation shaft (not shown) of the color wheel motor.
  • the rotation axis of the rotating body 703 and the rotation axis of the color wheel 701 coincide with each other.
  • a linear marking 706 is formed on the side surface of the rotating body 703 in parallel to the axial direction of the rotating shaft. The marking 706 is used to detect the position in the rotational direction of the boundary 702 between the yellow filter (Y) and the red filter (R) on the color wheel 701.
  • the photosensor 704 includes a light emitting unit that emits output light O that is IR (infrared) and a light receiving unit that receives the reflected light R.
  • the light emitting unit and the light receiving unit are disposed so as to face the side surface of the rotating body 703.
  • the side surface of the rotating body 703 is irradiated with the output light O from the light emitting unit.
  • the marking 706 formed on the side surface of the rotating body 703 reflects the output light O from the light emitting unit. Of the side surface of the rotator 703, portions other than the region where the marking 706 is formed do not reflect the output light O from the light emitting unit.
  • the color wheel 701 When the rotating body 703 is rotated at a predetermined rotation speed, the color wheel 701 also rotates at the same rotation speed.
  • the output light O from the light emitting unit is irradiated on the side surface of the rotating body 703, and the reflected light R reflected by the marking 706 is received by the light receiving unit.
  • the light receiving unit outputs an index signal indicating the timing at which the reflected light R is received. Based on this index signal, the position in the rotational direction of the boundary 702 between the yellow filter (Y) and the red filter (R) can be detected.
  • the diagram on the right side is a view of the hollow disc-like phosphor wheel 751 as seen from the direction perpendicular to the rotation plane.
  • the phosphor region (Y) and the transmission region are each formed on the rotation surface.
  • a hollow portion 755 is formed in the central portion of the phosphor wheel 751.
  • the diagram on the left side of FIG. 1B is a side view of the phosphor wheel unit.
  • the phosphor wheel unit includes a phosphor wheel 751, a phosphor wheel motor, a marking 756, and a photo sensor 754.
  • the phosphor wheel motor includes a cylindrical rotating body 753.
  • a portion of the hollow portion 755 of the phosphor wheel 751 is joined to a cylindrical rotating body 753, and the rotating body 753 rotates, whereby the phosphor wheel 751 can be rotated.
  • the phosphor wheel 751 rotates around a rotation axis (not shown) of the phosphor wheel 751.
  • the rotation axis of the rotating body 753 and the rotation axis of the phosphor wheel 751 coincide.
  • a linear marking 756 is formed on the side surface of the rotating body 753 in parallel to the axial direction of the rotating shaft. The marking 756 is used to detect the position of the boundary 752 between the phosphor region (Y) and the transmission region on the phosphor wheel 751 in the rotation direction.
  • the photosensor 754 has a light emitting unit that emits output light O that is IR (infrared) and a light receiving unit that receives the reflected light R. These light emitting part and light receiving part are arranged so as to face the side surface of the rotating body 753.
  • the output light O of the light emitting unit is irradiated on the side surface of the rotating body 753.
  • the marking 756 formed on the side surface of the rotating body 753 reflects the output light O from the light emitting unit. Of the side surface of the rotating body 753, the portion other than the region where the marking 756 is formed does not reflect the output light O from the light emitting unit.
  • the phosphor wheel 751 When the rotating body 753 is rotated at a predetermined rotation speed, the phosphor wheel 751 also rotates at the same rotation speed.
  • the output light O from the light emitting unit is irradiated on the side surface of the rotating body 753, and the reflected light R reflected by the marking 756 is received by the light receiving unit.
  • the light receiving unit outputs an index signal indicating the timing at which the reflected light R is received. Based on this index signal, the position of the boundary 752 between the phosphor region (Y) and the transmission region in the rotation direction can be detected.
  • FIG. 2 shows an example of an index signal output from the light receiving units of the photosensors 704 and 754.
  • the index signal will be described separately for the color wheel and the phosphor wheel.
  • the index signal indicates a period in which the period TP is one rotation of the color wheel 701. It becomes “L” logic in the period TP1 and “H” logic in the period TP2.
  • the fall of the period TP1 indicates the boundary 702 between the yellow filter (Y) and the red filter (R) on the color wheel 701.
  • the index signal indicates a period in which the period TP is one rotation of the phosphor wheel 751. It becomes “L” logic in the period TP1 and “H” logic in the period TP2.
  • the fall of the period TP1 indicates a boundary 752 between the phosphor region (Y) on the phosphor wheel 751 and the transmission region.
  • the index signal output from the photosensors 704 and 754 is used to synchronize the rotation of the color wheel 701 and the rotation of the phosphor wheel 751.
  • excitation light blue
  • the phosphor region (Y) includes a phosphor that is excited by excitation light and emits yellow fluorescence. In the phosphor wheel 751, yellow fluorescence is emitted in the phosphor region (Y), and excitation light (blue) is transmitted in the transmission region.
  • the yellow fluorescence from the phosphor region (Y) is sequentially irradiated to the red filter (R), the green filter (G), and the yellow filter (Y) of the color wheel 701.
  • the blue reflected light from the transmission region is applied to the blue filter (B) of the color wheel 701.
  • the same region is continuously irradiated with fluorescence from the high-power excitation light emitted from the LD or the phosphor region of the phosphor wheel 751.
  • the filter characteristics of the color wheel 751 deteriorate, and the filter may peel off in some cases.
  • FIG. 3 shows a wheel rotation abnormality detection process using the index signal.
  • the rotation speed of the wheel is 1800 rpm (30 Hz)
  • the falling edge of the index signal is a predetermined monitoring time (in the case of FIG. 3, three cycles of the rotation period of the wheel (33.3 ms (30 Hz))).
  • Min If it is not detected continuously, it is determined that the rotation of the wheel has stopped. And the process which avoids irradiation of the excitation light by LD with respect to a wheel is performed.
  • the reason why three wheel rotation periods are continuously detected is to prevent erroneous detection such as logical inversion of the index signal due to the influence of noise or the like. Specifically, it is assumed that the rotation of the wheel is stopped at the time t during the period TPA. At this time, the falling edge of the index signal is not detected at the end of the cycle TPA, and the logic of the index signal maintains the “H” state. The falling edge of the index signal is not detected at the time when the next cycle TPB ends (or during the cycle TPB) and the time when the cycle TPC ends (or during the cycle TPC).
  • Patent Document 1 describes a technique for retracting the phosphor wheel to a position off the optical path of the LD when the rotation speed of the motor that rotationally drives the phosphor wheel falls below a predetermined rotation speed.
  • Patent Document 2 describes a technique for detecting a marker and detecting an abnormal rotation of a wheel.
  • the wheel rotation abnormality detection process using the index signal shown in FIG. 3 has the following problems. For example, when the wheel is stopped at time t during the period TPA, the wheel stop process is performed after the processing margin (about 100 ms) for preventing erroneous detection has elapsed, and therefore the index signal is monitored. There is a problem that the time is too long.
  • the techniques described in the above patent documents all prevent the wheel from burning out due to LD irradiation when an abnormality occurs in the wheel. However, there is no mention of the monitoring time when the wheel rotation abnormality occurs.
  • An object of the present invention is to provide a wheel rotation abnormality detection device that can solve the above-described problems, a projector including the same, and a wheel rotation abnormality detection method.
  • the wheel rotation abnormality detection device of the present invention is a wheel rotation abnormality detection device that detects a rotation abnormality of a wheel that rotates at a predetermined cycle, and corresponds to the predetermined cycle and the logic is inverted at a duty ratio of 50%.
  • An index signal generating means for generating an index signal; a receiving means for receiving the index signal generated by the index signal generating means; and monitoring whether or not the index signal received by the receiving means has changed.
  • Monitoring means for monitoring the presence or absence of a change in the index signal in a predetermined period from the time when the change has occurred, and the wheel when the index signal has not changed in the predetermined period Determining means for determining that the rotation of the motor is abnormal.
  • a projector provided with the wheel rotation abnormality detection device of the present invention is a projector provided with a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle, and corresponds to the predetermined cycle.
  • Index signal generating means for generating an index signal whose logic is inverted when the duty ratio is 50%
  • receiving means for receiving the index signal generated by the index signal generating means, and the index signal received by the receiving means
  • Monitoring means for monitoring whether or not the index signal has changed, and when there is a change in the index signal, monitoring means for monitoring the presence or absence of the change in the index signal in a predetermined period from the time of the change, and the index in the predetermined period
  • the wheel rotation is abnormal Comprising determining means for determining that there is a.
  • the wheel rotation abnormality detection device of the present invention is a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle, and corresponds to the predetermined cycle and has a duty ratio of 50% and logic.
  • Index signal generating means for generating an inverted index signal
  • receiving means for receiving the index signal generated by the index signal generating means, a period of the index signal received by the receiving means, and the predetermined period
  • Monitoring means for monitoring whether or not and a period of the index signal and the predetermined period do not match, a determination means for determining that the rotation of the wheel is abnormal.
  • the wheel rotation abnormality detection method of the present invention is a wheel rotation abnormality detection method for detecting a rotation abnormality of a wheel rotating at a predetermined cycle, and corresponds to the predetermined cycle and has a duty ratio of 50% and logic.
  • Monitoring the presence or absence of the change in the index signal received by the step of generating the index signal to be inverted, receiving the index signal generated by the step of generating the index signal, and receiving the index signal;
  • monitoring the presence or absence of the change in the index signal in a predetermined period from the time of the change, and when there is no change in the index signal in the predetermined period, And determining that the rotation is abnormal.
  • FIG. 4 is a schematic diagram showing the configuration of the projector system.
  • the projector system includes a projector 10 and a personal computer (hereinafter also referred to as PC) 11.
  • the projector 10 enlarges and projects an image based on the video signal supplied from the personal computer 11 on the projection surface 12.
  • FIG. 5 is a schematic diagram illustrating a configuration of a portion related to the optical system of the light source device of the projector 10. As shown in FIG.
  • the light source device 300 of the projector 10 includes a laser light source 31, lens systems 301a and 302a, dichroic mirrors 303, 310, 311 and 312, condensing lenses 304, 306 and 307, a phosphor wheel 305, a color.
  • a wheel 308 and a light tunnel 309 are included.
  • the laser light source 31 is composed of a plurality of blue semiconductor lasers. As the number of blue semiconductor lasers increases, the light output intensity of the laser light source 31 increases.
  • the blue light output from the laser light source 31 is converted into a parallel light beam by the light beam diameter being converted by the lens systems 301a and 302a.
  • the blue light that has passed through the lens systems 301a and 302a enters the dichroic mirror 303 at an incident angle of approximately 45 °.
  • the dichroic mirror 303 has a spectral reflectance characteristic that reflects light in the blue wavelength region of the visible light wavelength region and transmits light in other wavelength regions.
  • the dichroic mirror 303 reflects blue light incident from the light source 31 via the lens systems 301a and 302a.
  • the blue reflected light from the dichroic mirror 303 is condensed on the phosphor wheel 305 by the condenser lens 304.
  • the phosphor wheel 305 has a phosphor region (Y) and a transmission region. These regions are provided adjacent to each other in the circumferential direction. While the phosphor wheel 305 is rotated at a predetermined rotation speed, the phosphor region (Y) and the transmission region are sequentially irradiated with the blue light collected by the condenser lens 304. Yellow fluorescence is emitted from the phosphor region (Y). The transmissive region transmits blue light. Yellow fluorescence from the phosphor region (Y) enters the dichroic mirror 303 via the condenser lens 304. The blue light transmitted through the transmission region is incident on the dichroic mirror 303 through the condenser lens 306 and the mirrors 310, 311, and 312.
  • the yellow fluorescence is transmitted through the dichroic mirror 303.
  • the dichroic mirror 303 reflects the blue light from the mirror 312 toward the condenser lens 307.
  • the yellow fluorescent light transmitted through the dichroic mirror 303 and the blue light reflected by the dichroic mirror 303 are incident on the condenser lens 307.
  • One end face of the light tunnel 309 is an incident face, and the other end face is an exit face.
  • the condensing lens 307 collects yellow fluorescent light and blue light on the incident surface of the light tunnel 309.
  • the color wheel 308 is disposed in the vicinity of the incident surface of the light tunnel 309. While rotating the color wheel 308 at a predetermined rotational speed, the light flux (blue light and yellow fluorescent light) from the condenser lens 307 is sequentially irradiated onto the filter of the color wheel 308. Light transmitted through each filter is emitted from the color wheel 308. Light emitted from the exit surface of the light tunnel 309 is output light from the light source device 300. The output light of the light source device 300 is irradiated to a DMD (digital micromirror device) that is an image forming element. An image formed by DMD is enlarged on the projection plane 12 by the projection lens.
  • DMD digital micromirror device
  • FIG. 6 shows a light source device including a wheel rotation abnormality detection unit.
  • a light source device 300 includes a CPU (Central Processing Unit) 350, a laser driver 32, a laser light source 31, a phosphor wheel 305, a phosphor wheel motor 322, a color wheel 308, a color wheel motor 323, a photo sensor 320, 321.
  • the CPU 350 includes a wheel rotation abnormality detection unit 350a.
  • the laser light source 31 emits a blue semiconductor laser that is excitation light of the light source device 300.
  • the operation of the laser driver 32 is controlled by a laser control signal output from the CPU 350.
  • the laser control signal output from the CPU 350 to the laser driver 32 is an instruction to irradiate the excitation light from the laser light source 31, the laser driver 32 irradiates the excitation light from the laser light source 31.
  • the rotation shaft of the phosphor wheel motor 322 is connected to the center of the phosphor wheel 305.
  • the operation of the phosphor wheel motor 322 is controlled by a motor control signal mp output from the CPU 350.
  • the motor control signal mp output from the CPU 350 to the phosphor wheel motor 322 is an instruction to rotate the phosphor wheel 305
  • the phosphor wheel motor 322 rotates the phosphor wheel 305.
  • the rotation axis of the color wheel motor 323 is connected to the center of the color wheel 308.
  • the operation of the color wheel motor 323 is controlled by a motor control signal mc output from the CPU 350.
  • the color wheel motor 323 rotates the color wheel 308.
  • the phosphor wheel 305 emits yellow fluorescence from the phosphor region (Y) and blue light from the transmission region when irradiated with the blue light from the laser light source 31.
  • the color wheel 308 is a wheel that separates light from the laser light source 31 according to transmission characteristics.
  • the light source device 300 emits four colors of light of three primary colors of RGB and yellow (Y) by combining the laser light source 31, the phosphor wheel 305, and the color wheel 308.
  • the photosensors 320 and 321 include a light emitting unit that emits output light O that is IR (infrared rays) and a light receiving unit that receives the reflected light R. These light emitting part and light receiving part are arranged so as to face the side surface of the rotating body of the motor.
  • the side surface of the rotating body is irradiated with output light O from the light emitting unit.
  • the marking formed on the side surface of the rotating body reflects the output light O from the light emitting unit. Of the side surface of the rotating body, portions other than the region where the marking is formed do not reflect the output light O from the light emitting unit.
  • the index signal receiving unit 324 receives an index signal synchronized with the light reception timing.
  • the monitoring unit 325 changes the index signal received by the index signal receiving unit 324, for example, the rising or falling of the index signal, the logic of the index signal is “H” or “L”, and the logic of the index signal is “H”. Whether the state is “L” or “L” is monitored.
  • the determination unit 326 receives the logical state (monitoring result) of the index signal monitored by the monitoring unit 325 and determines whether or not the rotation of the phosphor wheel 305 and the color wheel 308 is normally performed. .
  • the processing execution unit 327 stops the excitation light from the laser light source 31 with respect to the phosphor wheel 305, and the color wheel 308. For example, a process for stopping the excitation light from the laser light source 31 or the fluorescence from the phosphor wheel 305 is executed.
  • the wheel rotation abnormality detection unit 350a (the index signal reception unit 324, the monitoring unit 325, the determination unit 326, the execution processing unit 327), the photosensors 320 and 321, and the marking constitute the wheel rotation abnormality detection device of the present embodiment.
  • FIG. 7A is a diagram illustrating an example of a color wheel unit of the light source device according to the first embodiment. Marking for detecting the rotation position and the rotation state of the color wheel is attached to the rotating body of the color wheel motor constituting the color wheel unit.
  • the right side of FIG. 7A is a view of the hollow disc-shaped color wheel 308 as seen from the direction perpendicular to the rotation plane.
  • a red filter (R), a green filter (G), a blue filter (B), and a yellow filter (Y) are each formed on the rotation surface.
  • a hollow portion 355 is formed in the central portion of the color wheel 308.
  • the red filter (R) has a characteristic of transmitting light in the red wavelength region of visible light and absorbing (or reflecting) other light.
  • the green filter (G) has a characteristic of transmitting light in the green wavelength region of visible light and absorbing (or reflecting) other light.
  • the blue filter (B) has a characteristic of transmitting light in the blue wavelength region of visible light and absorbing (or reflecting) other light.
  • the yellow filter (Y) has a characteristic of transmitting the blue light of the laser light source 31 and absorbing (or reflecting) other light.
  • the left side of FIG. 7A is a side view of the color wheel unit.
  • the color wheel unit includes a color wheel 308, the color wheel motor 323 shown in FIG. 6, a marking 352, and a photo sensor 321.
  • the color wheel motor 323 includes a cylindrical rotating body 353.
  • the hollow portion 355 of the color wheel 308 is joined to a cylindrical rotary body 353, and the color wheel 308 can be rotated by rotating the rotary body 353.
  • the color wheel 308 rotates around a rotation shaft (not shown) of the color wheel motor 323.
  • the rotation axis of the rotating body 353 and the rotation axis of the color wheel 308 coincide with each other.
  • a strip-shaped marking 352 is formed on the side surface of the rotating body 353 in parallel to the axial direction of the rotating shaft. The marking 352 is used to detect the rotation position and rotation state of the color wheel 308.
  • the photo sensor 321 includes a light emitting unit that emits output light O that is IR (infrared) and a light receiving unit that receives the reflected light R.
  • the light emitting unit and the light receiving unit are arranged to face the side surface of the rotating body 353.
  • the side surface of the rotating body 353 is irradiated with the output light O of the light emitting unit.
  • the marking 352 formed on the side surface of the rotating body 353 reflects the output light O from the light emitting unit. Of the side surface of the rotator 353, the portion other than the region where the marking 352 is formed does not reflect the output light O from the light emitting unit.
  • the color wheel 308 When the rotating body 353 is rotated at a predetermined rotation speed, the color wheel 308 also rotates at the same rotation speed.
  • the output light O from the light emitting unit is irradiated on the side surface of the rotating body 353, and the reflected light R reflected by the marking 352 is received by the light receiving unit.
  • the light receiving unit outputs an index signal indicating the timing at which the reflected light R is received.
  • the index signal receiver 324 of the wheel rotation abnormality detector 350a receives this index signal.
  • the monitoring unit 325 of the wheel rotation abnormality detection unit 350a can monitor whether or not the color wheel 308 is rotating normally by monitoring that the period (timing) of the index signal is constant.
  • the light receiving unit of the photo sensor 321 outputs a voltage (index signal) corresponding to the amount of the reflected light R.
  • FIG. 7E to be described later shows an inversion signal corresponding to the amount of reflected light R.
  • the rotation position and the rotation state of the color wheel 308 are detected by detecting the falling timing of the index signal.
  • the rotation is controlled using the position of the falling timing as the rotation reference position, but the rising timing may be set according to the design of the monitoring unit 325 described above. The same applies to the photosensor 320 shown in FIG. 7B.
  • FIG. 7B is a diagram illustrating an example of the phosphor wheel unit of the light source device according to the first embodiment. Marking for detecting the rotation position and the rotation state of the phosphor wheel is attached to the rotating body of the phosphor wheel motor constituting the phosphor wheel unit.
  • the diagram on the right side of FIG. 7B is a view of the hollow disc-like phosphor wheel 305 as seen from the direction perpendicular to the rotation plane.
  • the phosphor region (Y) and the transmission region are each formed on the rotation surface.
  • a hollow portion 357 is formed in the central portion of the phosphor wheel 305.
  • the phosphor region (Y) is excited by the excitation light of the laser light source 31 and emits yellow fluorescence. In the transmission region 361, the excitation light (blue) of the laser light source 31 is transmitted.
  • the left side of FIG. 7B is a side view of the phosphor wheel unit.
  • the phosphor wheel unit includes the phosphor wheel 305, the phosphor wheel motor 322 shown in FIG. 6, the marking 359, and the photo sensor 320.
  • the phosphor wheel motor 322 includes a cylindrical rotating body 360. A portion of the hollow portion 357 of the phosphor wheel 305 is joined to a cylindrical rotating body 360, and the phosphor wheel 305 can be rotated by rotating the rotating body 360.
  • the phosphor wheel 305 rotates around a rotation shaft (not shown) of the phosphor wheel motor 322.
  • the rotation axis of the rotator 360 and the rotation axis of the phosphor wheel 305 coincide with each other.
  • a strip-shaped marking 359 is formed on the side surface of the rotating body 360 in parallel to the axial direction of the rotating shaft. This marking 359 is used for detecting the rotational position and abnormal rotation of the phosphor wheel 305.
  • the photo sensor 320 includes a light emitting unit that emits output light O that is IR (infrared) and a light receiving unit that receives the reflected light R.
  • the light emitting unit and the light receiving unit are arranged to face the side surface of the rotating body 360.
  • the output light O of the light emitting unit is irradiated on the side surface of the rotating body 360.
  • the marking 359 formed on the side surface of the rotating body 360 reflects the output light O from the light emitting unit. Of the side surface of the rotator 360, the portion other than the region where the marking 359 is formed does not reflect the output light O from the light emitting unit.
  • the phosphor wheel 305 When the rotating body 360 is rotated at a predetermined rotational speed, the phosphor wheel 305 is also rotated at the same rotational speed.
  • the output light O from the light emitting unit is irradiated on the side surface of the rotating body 360, and the reflected light R reflected by the marking 359 is received by the light receiving unit.
  • the light receiving unit outputs an index signal indicating the timing at which the reflected light R is received.
  • the index signal receiver 324 of the wheel rotation abnormality detector 350a receives this index signal.
  • the monitoring unit 325 of the wheel rotation abnormality detection unit 350a can monitor whether or not the phosphor wheel 305 is rotating normally by monitoring that the period (timing) of the index signal is constant. .
  • FIG. 7C is a diagram illustrating a state in which markings are formed on the rotating body of the color wheel motor constituting the color wheel unit of the light source device of the first embodiment.
  • FIG. 7C is a view of the rotator 353 of FIG. 7A viewed from the YY direction.
  • the marking 352 is provided in a region that occupies a half of the entire circumference of the side surface of the cylindrical rotating body 353 around the rotation shaft 362.
  • the rotating body 353 is rotated at a predetermined rotation speed
  • the color wheel 308 is also rotated at the same rotation speed.
  • the output light O emitted from the photosensor 321 is reflected by the marking 352 provided on the half circumference of the entire circumference of the side surface of the rotating body 353, and the reflected light R is received by the photosensor 321. Further, the output light O emitted from the photosensor 321 is not reflected in the remaining half circumference where the marking is not provided in the entire circumference of the rotation surface of the rotating body 353. By monitoring the reflected light R, it is possible to monitor whether the color wheel 308 is rotating normally.
  • At least one of the start point F or the end point E of the marking 352 is provided so as to correspond to the position of the boundary line 356 indicating the boundary between the yellow filter (Y) and the red filter (R) on the color wheel 308, for example. . Thereby, it is possible to simultaneously monitor whether or not the color wheel 308 is rotating normally and detect the position of the filter on the color wheel 308.
  • either the start point F or the end point of the marking 352 is placed at the position of the boundary line 358 indicating the boundary between the phosphor region (Y) and the transmission region on the phosphor wheel 305. Prepare to correspond. Thereby, it is possible to simultaneously monitor whether or not the phosphor wheel 305 is rotating normally and detect the position of the region on the phosphor wheel 305.
  • FIG. 7D is a diagram illustrating a modification of the form in which the marking is provided on the color wheel that configures the color wheel unit of the light source device of the first embodiment.
  • a photo sensor is arranged at a position facing the rotation surface of the color wheel 308.
  • the output light O emitted from the photo sensor is reflected by the markings 363 and 365 provided on the half circumference of the entire circumference of the rotation surface of the color wheel 308, and the reflected light R is received by the photo sensor.
  • FIG. 7D is a view from the opposite side of the plane of rotation on which the red filter (R), green filter (G), blue filter (B) and yellow filter (Y) of the color wheel 308 of the right side of FIG. 7A are formed. It is a figure.
  • FIG. 7D shows a first example in which marking is provided on the outer peripheral side of the rotating surface and a second example in which marking is provided on the inner peripheral side of the rotating surface.
  • first example half of the outer periphery of the rotation surface on which the red filter (R), green filter (G), blue filter (B), and yellow filter (Y) of the color wheel 308 are formed is formed.
  • a marking 363 is provided in the occupied area, and no marking is provided in the area 364 occupying the remaining half circumference.
  • the second example is a half of the inner circumference of the opposite surface of the rotation surface on which the red filter (R), green filter (G), blue filter (B), and yellow filter (Y) of the color wheel 308 are formed.
  • the marking 365 is provided in the area occupying the area, and the marking is not provided in the area 366 occupying the remaining half circumference.
  • the width of the marking 363 in the direction from the outer peripheral end of the color wheel 308 toward the center point is determined from the outer peripheral end of the color wheel 308 by the red filter (R), the green filter (G), and the blue filter (B ) And the yellow filter (Y) are within the range up to the outer peripheral end 367.
  • the width of the marking 365 in the direction from the inner peripheral end of the color wheel 308 toward the outer periphery is determined from the inner peripheral end of the color wheel 308 by the red filter (R), the green filter (G), and the blue filter ( B) and the inner peripheral end 368 where the yellow filter (Y) is formed.
  • the light incident on the color wheel 308 from the condenser lens 307 passes through the red filter (R), the green filter (G), the blue filter (B), and the yellow filter (Y). Therefore, it is necessary to form the markings 363 and 365 so that the markings 363 and 365 do not block the light transmitted through each filter.
  • markings 363 and 365 are attached to areas avoiding the red filter (R), green filter (G), blue filter (B), and yellow filter (Y) areas surrounded by dotted lines.
  • the markings 363 and 365 are provided on the surface opposite to the surface on which the red filter (R), the green filter (G), the blue filter (B), and the yellow filter (Y) are formed.
  • the phosphor wheel 305 when the phosphor wheel 305 is formed with a reflective layer and a yellow filter on the transparent substrate, the phosphor wheel 305 has the phosphor region (Y) and the transmission. Has an area. As described with reference to FIG. 5, the blue light collected by the condenser lens 304 is reflected by the phosphor region (Y) and transmitted through the transmission region. Accordingly, it is necessary to form the markings 363 and 365 so that the markings 363 and 365 do not block the light reflected or transmitted through each region.
  • the surface opposite to the surface where the phosphor region (Y) and the transmission region are formed or the same surface as the surface where the phosphor region (Y) and the transmission region are formed the surface opposite to the surface where the phosphor region (Y) and the transmission region are formed or the same surface as the surface where the phosphor region (Y) and the transmission region are formed.
  • the light incident from the condenser lens 304 (FIG. 5) or the light transmitted through the phosphor wheel 305 is provided in a region where it is not blocked.
  • any one of the marking 363 and the marking 365 may be provided, and any of the marking arrangements shown in FIGS. 7C and 7D is arbitrary.
  • a photo sensor is disposed at a position facing the rotation surface (the surface on which the marking is formed) of the color wheel 308 or the phosphor wheel 305.
  • the output light O emitted from the photo sensor is marked 363, 365 provided on the half circumference of the entire circumference of the rotation surface of the color wheel 308 or the phosphor wheel 305.
  • the reflected light R is received by the photosensor.
  • the output light O emitted from the photosensor is not reflected in the regions 364 and 366 where the markings 363 and 365 are not attached.
  • the reflected light R it is possible to monitor whether the color wheel 308 or the phosphor wheel 305 is rotating normally.
  • one of the start point F and the end point E of the marking 363 or the marking 365 corresponds to the position of the boundary line 356 indicating the boundary between the yellow filter (Y) and the red filter (R) on the color wheel 308, for example.
  • either the start point F or the end point of the marking 363 or the marking 365 is provided so as to correspond to the position of the boundary line 358 indicating the boundary between the phosphor region (Y) and the transmission region on the phosphor wheel 305, for example. By doing so, it is possible to simultaneously monitor whether or not the phosphor wheel 305 is rotating normally and to detect the position of the region on the phosphor wheel 305.
  • FIG. 7E is a diagram showing a difference between the waveform of the index signal output by the wheel rotation of the wheel rotation abnormality detection device of the first embodiment and the waveform of the index signal of the comparative example.
  • the comparative example employs an index signal used to detect the position of the filter boundary or the region boundary on the wheel in the rotational direction, which has been described with reference to FIGS.
  • the waveform of the index signal of the photosensors 704 and 754 (FIG. 1) of the comparative example is the marking position from the photosensors 704 and 754 in one cycle in which the color wheel 701 and the phosphor wheel 751 rotate.
  • the logic Only when the reflected light R with respect to the output light O irradiated to the light sources 706 and 756 is received by the photosensors 704 and 754, the logic becomes “L”.
  • the pulse width of “L” in the waveform of the index signal corresponds to the circumferential width of the markings 706 and 756 attached to the cylindrical rotating bodies 703 and 753 of the color wheel motor and the phosphor wheel motor.
  • the markings 352, 363, and 365 are provided in a region that occupies a half of the outer periphery of the rotating surface of the wheel 308 or a region that occupies a half of the inner periphery of the rotating surface of the color wheel 308. Therefore, as shown in the lower part of FIG.
  • the waveform of the index signal indicates the time when the reflected light R with respect to the output light O emitted from the photosensor 321 to the markings 352, 363, 365 is received by the photosensor 321, ie, the color wheel.
  • the logic level is “L” only for a time corresponding to half the circumference of 308.
  • the waveform of the index signal becomes a binary signal in which the cycle of one rotation of the color wheel 308 repeats “L” logic and “H” logic with a duty ratio of 50%. This is the same even in the case of the phosphor wheel 305.
  • FIG. 8A is a diagram illustrating an example of a waveform of an index signal output by the rotation of the wheel of the wheel rotation abnormality detection device according to the first embodiment.
  • GPIO General Purpose Input Output
  • FIG. 8A it is detected whether the color wheel 308 is rotating normally by inputting the waveform output of the index signal to a GPIO (General Purpose Input Output) terminal or the like of the CPU. It is said.
  • the rotation period of the color wheel 308 is 30 Hz (33.3 ms) as shown in FIG. 8A.
  • the waveform of the index signal becomes “H” logic during the period TR1 (60 Hz: 16.7 ms), for example, and during the period TR2 (60 Hz: 16.7 ms). "L” logic.
  • the duty ratio between the period TR1 and the period TR2 is 50%.
  • the waveform of the index signal is “L” logic only for the time when the reflected light R with respect to the output light O irradiated to the marking from the photosensor is received by the photosensor, that is, the time corresponding to the half circumference of the color wheel 308.
  • the logic that makes the index signal active may select either “H” or “L”.
  • FIG. 8B is a diagram illustrating an example of a waveform of an index signal output due to wheel rotation abnormality of the wheel rotation abnormality detection device of the first embodiment.
  • the rotation period is 30 Hz (33.3 ms). Therefore, the period (1) of TR1 (60 Hz: 16.7 ms), the period (2) of TR2 (60 Hz: 16.7 ms), and the period (3) of TR1 (60 Hz: 16.7 ms) have elapsed.
  • the monitoring unit 325 of the wheel rotation abnormality detection unit 350a monitors that the logic of the waveform of the index signal has changed (a fall from “H” to “L” or a rise from “L” to H ”). To do.
  • the index signal receiving unit 324 of the wheel rotation abnormality detecting unit 350a receives the index signal from the photosensor 321 (the state in which marking is detected). It is assumed that the rotation of the wheel 308 has stopped. Then, when the color wheel 308 is rotating normally, the waveform of the index signal that should have risen from “L” to “H” when the period “a” elapses is changed to “L” to stop the rotation.
  • the monitoring unit 325 monitors that the state remains.
  • the monitoring unit 325 monitors whether the logic of the waveform of the index signal has been switched when the period b (60 Hz: 16.7 ms) has elapsed.
  • the monitoring unit 325 monitors that the waveform of the index signal remains “L” when the period b has elapsed.
  • the monitoring unit 325 monitors whether the logic of the waveform of the index signal has been switched when the period c (60 Hz: 16.7 ms) has elapsed.
  • the monitoring unit 325 monitors that the waveform of the index signal remains “L” when the period c has elapsed.
  • the monitoring unit 325 monitors that there is no change in the logic of the waveform of the index signal when all the periods a, b, and c have elapsed
  • the monitoring unit 325 receives the monitoring result from the monitoring unit 325, and the determination unit 326 It is determined that the rotation of the wheel 308 is abnormal, and the process execution unit 327 executes a wheel stop process such as avoiding irradiation of excitation light from the laser light source 31.
  • FIG. 8C is a diagram illustrating an example of a waveform of an index signal output due to wheel rotation abnormality of the wheel rotation abnormality detection device of the first embodiment.
  • the rotation period is 30 Hz (33.3 ms). Therefore, the period (1) of TR2 (60 Hz: 16.7 ms), the period (2) of TR1 (60 Hz: 16.7 ms), and the period (3) of TR2 (60 Hz: 16.7 ms) have elapsed.
  • the monitoring unit 325 of the wheel rotation abnormality detection unit 350a monitors that the logic of the waveform of the index signal has changed (a fall from “H” to “L” or a rise from “L” to H ”). To do.
  • the monitoring unit 325 monitors whether the logic of the waveform of the index signal has been switched when the period b (60 Hz: 16.7 ms) has elapsed.
  • the monitoring unit 325 monitors that the waveform of the index signal remains “H” when the period b has elapsed.
  • the monitoring unit 325 monitors whether the logic of the waveform of the index signal has been switched when the period c (60 Hz: 16.7 ms) has elapsed. Here, in order to stop the rotation, the monitoring unit 325 monitors that the waveform of the index signal remains “H” when the period c has elapsed.
  • the monitoring unit 325 monitors that there is no change in the logic of the waveform of the index signal when all the periods a, b, and c have elapsed
  • the monitoring unit 325 receives the monitoring result from the monitoring unit 325, and the determination unit 326 It is determined that the rotation of the wheel 308 is abnormal, and the process execution unit 327 executes a wheel stop process such as avoiding irradiation of excitation light from the laser light source 31.
  • the monitoring unit 325 monitors the switching of the logic of the waveform of the index signal when each of the period a, the period b, and the period c elapses. Further, monitoring may be continued during the period b and the period c.
  • the avoidance process include a process of stopping irradiation of excitation light from the laser light source 31 and retracting a wheel from the irradiation of excitation light by the laser light source 31.
  • the logic of the waveform of the index signal is switched every half cycle of the rotation period of the color wheel 308 (30 Hz (33.3 ms)). Therefore, by matching the marking start point F or end point E with the position of the wheel filter or the boundary of the region, the position of the wheel filter or region can be detected simultaneously.
  • the marking 352 is continuously provided in a region that occupies a half of the entire circumference of the side surface of the cylindrical rotating body 353.
  • markings may be provided every other area in which the entire circumference is equally divided into a plurality. For example, consider dividing the entire circumference equally into four. First, marking is continuously provided in an area occupying a quarter cycle, marking is not provided in an area occupying the next quarter period, and further, an area occupying the next quarter period is continuously provided. Marking is provided so that no marking is provided in the area occupying the next quarter cycle.
  • the period of inversion of the logic of the waveform of the index signal is halved, so that the monitoring unit 325 monitors the logical change of the waveform of the index signal (a, b, c in FIGS. (Period) is also halved. Therefore, it becomes possible to detect the rotation stop of the wheel earlier.
  • the markings 363 and 365 can be similarly divided.
  • the rotation reference position cannot be detected unless the marking for detecting the rotation reference position is determined in advance.
  • the marking for detecting the reference position of rotation is the first marking having the first reflectance
  • the other marking is the second reflectance (reflectance different from the first reflectance).
  • the second marking having a rate).
  • the output voltage of the light receiving section of the photosensor becomes different between the first marking and the second marking, so that the rotation reference position can be detected.
  • the markings may have the same reflectance or all the reflectances may be changed.
  • the reflected light R is received by the photosensor in the area where the marking is provided (hereinafter also referred to as a marking area).
  • the index signal is one cycle of the time corresponding to the marking area and the time corresponding to the unmarked area. Further, the logic of the index signal is inverted between the waveform corresponding to the marking area and the waveform corresponding to the unmarked area, and the duty ratio becomes 50%.
  • the position of the filter can be detected at the same time by matching the start point or end point of the marking with the position of the filter boundary line 356 of the color wheel 308. Similarly, by aligning the marking start point or end point with the position of the boundary line 358 of the region of the phosphor wheel 305, the region position can be detected simultaneously.
  • FIG. 9 is a flowchart showing the operation of the wheel rotation abnormality detection device of the first embodiment.
  • the color wheel motor 323 rotates the color wheel 308 in step S901.
  • excitation light is emitted from the laser light source 31 to the color wheel 308.
  • the output light O is emitted from the photo sensor 321 to the marking 352.
  • the photo sensor 321 receives the reflected light R reflected by the marking 352.
  • the index signal receiving unit 324 receives an index signal indicating the timing at which the reflected light R is received.
  • the monitoring unit 325 monitors the logic of the index signal received in the process of step S902.
  • the determination unit 326 determines whether the logic of the index signal monitored in the process of step S903 has been switched. If the determination unit 326 determines that the logic has been switched (step S904: Y), the process proceeds to step S905. If the determination unit 326 determines that the logic has not been switched (step S904: N), the processing of step S903 is performed until the logic is switched.
  • step S905 the monitoring unit 325 monitors the logic of the index signal within the monitoring time from the logic switching point at which the determination unit 326 determines that the logic has been switched in the process of step S904.
  • step S906 the determination unit 326 determines whether the logic has been switched within the monitoring time monitored in the process of step S905. If the determination unit 326 determines that the logic has been switched (step S906: Y), the process returns to step S905.
  • step S905 the monitoring unit 325 monitors the logic of the index signal within the monitoring time from the time when the determination unit 326 determines that the logic has been switched in the process of step S906. If the determination unit 326 determines that the logic has not been switched (step S906: N), the process proceeds to step S907.
  • step S907 the determination unit 326 determines that the rotation of the wheel is abnormal.
  • the process execution unit 327 executes a process for avoiding the irradiation of excitation light from the laser light source 31 to the color wheel 308, and ends the process. If the determination unit 326 determines that the logic of the index signal is not switched (step S904: N) in the process of step S904, the monitoring unit 325 monitors the logic of the index signal received in the process of step S902.
  • step S906 determines that the logic of the index signal has been switched within the monitoring time (step S906: Y) in the processing of step S903 and the processing of step S906, the time when the monitoring unit 325 determines that the logic has been switched.
  • the processing of step S905 for monitoring the logic of the index signal within the monitoring time is continuously executed while the light source device 300 is operating.
  • the rotation of the wheel it can be determined in a short time that the rotation of the wheel has stopped. Thereby, when the rotation of the wheel is stopped, it is possible to execute the process of avoiding the irradiation of the excitation light from the laser light source to the wheel at an early stage and prevent the wheel from being burned out. Also, monitoring of wheel rotation abnormality and detection of the position of the filter or region can be performed simultaneously.
  • FIG. 10 is a diagram illustrating an example of a phosphor wheel, a phosphor wheel index signal, a color wheel, a color wheel index signal, and a DMD sequence of the light source device including the wheel rotation abnormality detection device of the first embodiment.
  • the rotation of the color wheel 308 and the rotation of the phosphor wheel 305 are synchronized using index signals output from the photosensors 321 and 320.
  • excitation light (blue) emitted from the laser light source 31 is sequentially irradiated to the phosphor region (Y) and the transmission region.
  • the phosphor region (Y) includes a phosphor that is excited by excitation light and emits yellow fluorescence.
  • yellow fluorescence is emitted in the phosphor region (Y), and excitation light (blue) is transmitted in the transmission region.
  • the yellow fluorescence from the phosphor region (Y) is irradiated to the red filter (R), the green filter (G), and the yellow filter (Y) of the color wheel 308 in this order.
  • the blue reflected light from the transmission region is applied to the blue filter (B) of the color wheel 308.
  • images are formed in the order of a yellow image (Y), a red image (R), a green image (G), and a blue image (B).
  • the marking is provided on the half circumference of the rotating body or the half circumference of the wheel, and either the start point F or the end point E of the marking is a boundary line between the yellow filter (Y) and the red filter (R) of the color wheel 308. It is provided so as to correspond to the position of 356.
  • the waveform of the index signal of the color wheel 308 falls in synchronization with the switching time of the yellow filter (Y) and the red filter (R), rises after the half cycle (TR1) of the cycle TR, and rises in the cycle TR.
  • TR1 half cycle of the cycle TR2
  • the marking is provided on the half circumference of the rotating body or the half circumference of the wheel, and either the start point F or the end point E of the marking is defined as a boundary line 358 between the phosphor region (Y) and the transmission region of the phosphor wheel 305. It is provided so as to correspond to the position.
  • the waveform of the index signal of the phosphor wheel 305 falls in synchronization with the switching point between the phosphor region (Y) and the transmission region, rises after the half cycle (TR1) of the cycle TR, and half of the cycle TR.
  • TR1 half cycle
  • TR2 half of the cycle
  • the wheel rotation abnormality detection device of the second embodiment of the present invention basically has the configuration shown in FIG. 6, but the operation of the monitoring unit 325 and the operation of the determination unit 326 are the same as those of the first embodiment. Different. Specifically, the monitoring unit 325 monitors whether or not the cycle of the index signal received by the index signal receiving unit 324 matches the rotation cycle of the wheel. In addition, the determination unit 326 determines that the rotation of the wheel is abnormal when the cycle of the index signal does not match the rotation cycle of the wheel.
  • FIG. 11A is a diagram illustrating an example of a waveform of an index signal output when the wheel of the wheel rotation abnormality detection device according to the second embodiment of the present invention is normally rotating. Referring to FIG.
  • the logic that makes the waveform of the index signal active is assumed to be either “H” or “L”.
  • the rotation period of the color wheel 308 is set to 120 Hz, and the frequency of the index signal waveform is set to 120 Hz, which is the same as the rotation period.
  • the waveform of the index signal becomes “H” logic at a period Ta1 (240 Hz: 4.17 ms) with a duty ratio of 50%, and becomes “L” logic at a period Ta2 (240 Hz: 4.17 ms).
  • Ta1 240 Hz: 4.17 ms
  • Ta2 240 Hz: 4.17 ms
  • FIG. 11B is a diagram illustrating an example of a waveform of an index signal output when the wheel rotation operation of the wheel rotation abnormality detection device of the second embodiment is in an unstable state.
  • the period differs between “H” logic (cycle Tb1) and “L” logic (cycle Tb2) of the waveform of the index signal, which should originally have a duty ratio of 50%, and the duty ratio is 50%. It ’s gone. This indicates, for example, that the rotation speed is changing between the portion of the color wheel 308 marked and the other portion. Therefore, it indicates that the rotation operation of the color wheel 308 is unstable as the rotation abnormality of the color wheel 308.
  • FIG. 11C is a diagram illustrating an example of a waveform of an index signal output when the wheel rotation of the wheel rotation abnormality detection device of the second embodiment is delayed with respect to the setting of the wheel rotation speed. is there.
  • the period (time) of the “H” logic (period Tc1) and the “L” logic (period Tc2) of the waveform of the index signal that should originally be 120 Hz is longer. This indicates that the rotation speed of the color wheel 308 is slower than the setting of the rotation speed of the color wheel 308 (normal time) as an abnormal rotation of the color wheel 308.
  • FIG. 11D is a diagram illustrating an example of a waveform of an index signal output when the rotation of the wheel of the wheel rotation abnormality detection device according to the second embodiment is in a state of being faster than the setting of the rotation speed of the wheel. It is. Referring to FIG. 11D, the period (time) between the “H” logic (period Td1) and the “L” logic (period Td2) of the waveform of the index signal, which should originally be 120 Hz, is shortened. This indicates that the rotation speed of the color wheel 308 is higher than the setting of the rotation speed of the color wheel 308 (normal time) as an abnormal rotation of the color wheel 308.
  • whether the rotation state of the wheel is normal or not is easily monitored by comparing the setting of the rotation number of the wheel and the timing of the waveform of the index signal (the rotation cycle of the wheel). be able to.
  • FIG. 12 is a block diagram illustrating a configuration of an embodiment of the wheel rotation abnormality detection device illustrated in the third embodiment.
  • the wheel rotation abnormality detection device according to the third embodiment is a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle.
  • the wheel rotation abnormality detection device 349 includes an index signal generation unit 344 that generates an index signal that corresponds to a predetermined cycle and whose logic is inverted at a duty ratio of 50%.
  • a reception unit 345 that receives the index signal generated by the index signal generation unit 344 is provided. Further, the logic of the index signal received by the receiving unit 345 is monitored for inversion.
  • the logic of the index signal When the logic of the index signal is inverted, the logic of the index signal is inverted for a predetermined period from the time when the logic is inverted.
  • the monitoring part 346 which monitors the presence or absence of is provided.
  • a determination unit 347 is provided that determines that the rotation of the wheel is abnormal when there is no inversion of the logic of the index signal in a predetermined period. Note that the logic inversion of the index signal is an example of a change in the index signal.
  • the wheel rotation abnormality detection device of the fourth embodiment is a wheel rotation abnormality detection device that detects rotation abnormality of a wheel that rotates at a predetermined rotation cycle. Differences from the third embodiment will be described. Specifically, a monitoring unit 346 is provided for monitoring whether or not the cycle of the index signal received by the receiving unit 345 matches the wheel rotation cycle. In addition, when the period of the index signal and the rotation period of the wheel do not coincide with each other, a determination unit 347 that determines that the rotation of the wheel is abnormal is provided.
  • a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle, Index signal generating means for generating an index signal that corresponds to the predetermined period and whose logic is inverted at a duty ratio of 50%; Receiving means for receiving the index signal generated by the index signal generating means; Monitoring whether the index signal received by the receiving means is changed, and monitoring whether the index signal has changed in a predetermined period from the time when the index signal has changed.
  • a wheel abnormality detection device comprising: [Appendix 2] The wheel rotation abnormality detection device according to appendix 1, wherein the predetermined period is an integral multiple of a time corresponding to a half period of the predetermined period.
  • a projector including a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle, Index signal generating means for generating an index signal that corresponds to the predetermined period and whose logic is inverted at a duty ratio of 50%; Receiving means for receiving the index signal generated by the index signal generating means; Monitoring whether the index signal received by the receiving means is changed, and monitoring whether the index signal has changed in a predetermined period from the time when the index signal has changed.
  • a projector comprising: [Appendix 10] The projector according to appendix 9, wherein the predetermined period is an integral multiple of a time corresponding to a half period of the predetermined period. [Appendix 11] The rotating shaft of the motor that rotates the wheel is connected to the center of the hollow disk-shaped wheel, The disk part of the wheel and the rotating body covering the rotating shaft of the motor rotate with the rotation of the rotating shaft, The projector according to appendix 9 or 10, wherein a marking is provided in a region that occupies a half of the entire circumference of the side surface of the cylindrical rotating body centering on the rotation axis.
  • any one of appendices 11 to 13 wherein at least one of the boundaries is coincident with a marking start point or an end point provided in an area occupying the half circumference.
  • Appendix 15 Any one of appendices 11 to 14, further comprising a light receiving means for receiving reflected light reflected by the output light applied to the marking, wherein the logic of the index signal is inverted at a timing when the light receiving means receives the reflected light.
  • Appendix 16 The projector according to any one of appendices 9 to 15, wherein the change in the index signal is a change in the logic of the index signal.
  • a wheel rotation abnormality detection device that detects rotation abnormality of a wheel rotating at a predetermined cycle, Index signal generating means for generating an index signal that corresponds to the predetermined period and whose logic is inverted at a duty ratio of 50%; Receiving means for receiving the index signal generated by the index signal generating means; Monitoring means for monitoring whether or not the period of the index signal received by the receiving means matches the predetermined period; Determining means for determining that the rotation of the wheel is abnormal when the period of the index signal does not match the predetermined period; A wheel abnormality detection device comprising: [Appendix 18] The wheel abnormality detection device according to appendix 17, wherein when the duty ratio of the index signal is not 50%, the determination unit determines that the rotation of the wheel is abnormal.
  • a wheel rotation abnormality detection method for detecting rotation abnormality of a wheel rotating at a predetermined cycle, Generating an index signal that corresponds to the predetermined period and whose logic is inverted at a duty ratio of 50%; Receiving the index signal generated by generating the index signal; The index signal received by the receiving step is monitored for change, and when the index signal is changed, the index signal is monitored for change in a predetermined period from the time of the change. Process, Determining that the rotation of the wheel is abnormal when there is no change in the index signal in the predetermined period;
  • a wheel rotation abnormality detection method comprising:

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

La présente invention concerne la détection d'une anomalie de rotation de roue en un temps court. L'invention concerne un dispositif de détection d'anomalie de rotation de roue permettant de détecter une anomalie de rotation d'une roue qui tourne selon une période prescrite, le dispositif de détection étant équipé : d'un moyen de génération de signal d'indice permettant de générer un signal d'indice correspondant à la période prescrite et de présenter une inversion de logique à un rapport cyclique de 50 % ; un moyen de réception permettant de recevoir le signal d'indice généré par le moyen de génération de signal d'indice ; un moyen de surveillance permettant de surveiller si le signal d'indice reçu par le moyen de réception change, et lorsque le signal d'indice a changé, de surveiller si le signal d'indice change ou non pendant un intervalle prescrit à partir du moment où le changement s'est produit ; et un moyen de détermination permettant de déterminer si la rotation de la roue est anormale, lorsqu'il n'y a pas de changement dans le signal d'indice pendant l'intervalle prescrit.
PCT/JP2016/088147 2016-12-21 2016-12-21 Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue WO2018116414A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/088147 WO2018116414A1 (fr) 2016-12-21 2016-12-21 Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/088147 WO2018116414A1 (fr) 2016-12-21 2016-12-21 Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue

Publications (1)

Publication Number Publication Date
WO2018116414A1 true WO2018116414A1 (fr) 2018-06-28

Family

ID=62626049

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/088147 WO2018116414A1 (fr) 2016-12-21 2016-12-21 Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue

Country Status (1)

Country Link
WO (1) WO2018116414A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11112687B2 (en) 2019-04-11 2021-09-07 Casio Computer Co., Ltd. Projector, projection control method, and storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59102103A (ja) * 1982-12-03 1984-06-13 Kawasaki Heavy Ind Ltd 回転軸センサの監視装置
JP2011158726A (ja) * 2010-02-01 2011-08-18 Casio Computer Co Ltd 投影装置及び投影方法
JP2015031876A (ja) * 2013-08-05 2015-02-16 セイコーエプソン株式会社 照明装置及びプロジェクター

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59102103A (ja) * 1982-12-03 1984-06-13 Kawasaki Heavy Ind Ltd 回転軸センサの監視装置
JP2011158726A (ja) * 2010-02-01 2011-08-18 Casio Computer Co Ltd 投影装置及び投影方法
JP2015031876A (ja) * 2013-08-05 2015-02-16 セイコーエプソン株式会社 照明装置及びプロジェクター

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11112687B2 (en) 2019-04-11 2021-09-07 Casio Computer Co., Ltd. Projector, projection control method, and storage medium

Similar Documents

Publication Publication Date Title
EP3109696B1 (fr) Dispositif de rayonnement optique et dispositif d'affichage d'image le comprenant
KR101768557B1 (ko) 조명 장치 및 프로젝터
KR101114613B1 (ko) 광원에 레이저를 이용한 광원장치 및 프로젝터
US10260709B2 (en) Laser light source, method for controlling dual color wheels of light source, and laser projection device
JP6429300B2 (ja) 投射型表示システム、投射型表示装置及びタイミング調整方法
US9832433B2 (en) Laser light source, method for controlling dual color wheels of light source, and laser projection device
US10006610B2 (en) Laser light source, method for controlling dual color wheels of light source, and laser projection device
TWI438488B (zh) 光學掃描投影系統
JP7082490B2 (ja) 異常検出装置、投影装置、異常検出方法、及びプログラム
WO2018116414A1 (fr) Dispositif de détection d'anomalie de rotation de roue, projecteur équipé de ce dernier et procédé de détection d'anomalie de rotation de roue
JP2005300647A (ja) カラープロジェクタ及びその同期調整方法
JP2019194679A (ja) 蛍光体ホイール、光源装置および投写型映像表示装置
US9976879B2 (en) Color wheel rotation speed detecting module
JP6590432B2 (ja) プロジェクタ及び駆動制御方法
US11397375B2 (en) Image projection apparatus
JP4025684B2 (ja) カラープロジェクタの同期制御方法及び同期制御装置
JP4759970B2 (ja) プロジェクタ
JP2020003628A (ja) 蛍光体ホイール、光源装置、および投写型映像表示装置
JP2020079864A (ja) 光源装置、光源装置を用いたプロジェクタ、および光源装置の制御方法
JP2014032266A (ja) 画像投影装置
JP2019120811A (ja) 異常検出装置、投影装置、異常検出方法、及びプログラム
JP6303542B2 (ja) 光源装置及び画像投影装置
JP2006106240A (ja) 回転速度検出回路及び該回路を用いた投射型表示装置
JP2018136507A (ja) 照明装置、画像投射装置、回転体の破損判定方法
JP2021076724A (ja) カラーホイールユニット及び画像投影装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16924514

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16924514

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP