WO2023228914A1 - Dispositif et procédé d'éclairage - Google Patents

Dispositif et procédé d'éclairage Download PDF

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Publication number
WO2023228914A1
WO2023228914A1 PCT/JP2023/019005 JP2023019005W WO2023228914A1 WO 2023228914 A1 WO2023228914 A1 WO 2023228914A1 JP 2023019005 W JP2023019005 W JP 2023019005W WO 2023228914 A1 WO2023228914 A1 WO 2023228914A1
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Prior art keywords
light
circuit
illumination light
stop
amount
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PCT/JP2023/019005
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English (en)
Japanese (ja)
Inventor
孝義 鈴木
雅和 小林
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ニデックプレシジョン株式会社
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Publication of WO2023228914A1 publication Critical patent/WO2023228914A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/70—Prevention of harmful light leakage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to a lighting device and a lighting method.
  • Moving objects such as automobiles have been known in the past that are equipped with lighting devices and perform various displays by projecting light from the lighting devices.
  • the moving body of Patent Document 1 is equipped with an illumination device that illuminates an illuminated area with coherent light emitted from a light source via a diffractive optical element.
  • the direction in which the moving body moves is projected onto this illuminated area according to the pattern formed on the diffractive optical element. That is, the lighting device functions as a direction display device.
  • the coherent light emitted from the light source has high intensity, but by passing through the diffractive optical element, it is attenuated to an intensity that does not have any adverse effect even if it enters the human eye.
  • Patent Document 1 If light whose intensity is not attenuated due to damage etc. is emitted and enters the human eye, there is a risk of harm to the human eye, so it is necessary to detect abnormalities in the device to ensure safety. required.
  • the diffractive optical element and the housing are attached to each other by electrically connecting two terminals, and when the connection between the terminals is interrupted, the falling off of the diffractive optical element is detected.
  • the apparatus of Patent Document 1 cannot detect damage other than falling off, such as a hole being formed in a part of the diffractive optical element.
  • a detection section and a circuit that uses the signal output from the detection section to determine the presence or absence of damage to the diffractive optical element are provided.
  • no signal is output from the detection unit when the power is turned on, and the operation of the circuit is not stable there is a risk that damage to the diffractive optical element may be incorrectly detected, and the operation of the light source may be forcibly stopped. There is. In such a case, a problem arises in that the light source does not emit light even though the power is turned on.
  • An illumination device includes: a light source that emits illumination light; a branching section that branches the illumination light emitted from the light source into first illumination light and second illumination light; a diffraction section that emits part of the light to the outside and reflects the other part; a first detection section that detects the amount of light reflected by the diffraction section; and a second detection section that detects the amount of the second illumination light.
  • a detection unit an abnormality detection circuit that detects whether or not there is an abnormality in the illumination light emitted from the light source based on the amount of light detected by the second detection unit; Based on the defect detection circuit that detects the presence or absence of a defect in the diffraction section, and the abnormality detection circuit detects an abnormality in the illumination light, or the defect detection circuit detects a defect in the diffraction section, a stop circuit that outputs a stop signal that causes the light source to stop emitting the illumination light; and a stop circuit that outputs a stop signal that causes the light source to stop emitting the illumination light; and a stop circuit that outputs a stop signal that causes the light source to stop emitting the illumination light; and a stop circuit that outputs a stop signal that causes the light source to stop emitting the illumination light; A delay circuit that stops outputting the signal.
  • An illumination method includes: emitting illumination light from a light source; branching the illumination light emitted from the light source into first illumination light and second illumination light; A first detecting section detects the amount of light reflected by the illumination light, a second detecting section detects the amount of the second illumination light, and the amount of light emitted from the light source is detected based on the amount of light detected by the second detecting section.
  • the operation of an abnormality detection circuit that detects the presence or absence of an abnormality in the illumination light and the operation of a defect detection circuit that detects the presence or absence of a defect in the diffraction section based on the amount of light detected by the first detection section are stabilized. Up to this point, when an abnormality in the illumination light or a defect in the diffraction section is detected, a stop circuit that outputs a stop signal that causes the light source to stop emitting the illumination light is caused to stop outputting the stop signal.
  • the forced stop signal is prevented from being output when the power is turned on, and the operation of the light source is suppressed from being forced to stop.
  • FIG. 1 is a block diagram showing the main configuration of a lighting device according to an embodiment.
  • FIG. 2 is a block diagram showing the configuration of a control circuit included in the lighting device.
  • FIG. 3A is a timing chart illustrating the operation of the lighting device after power is turned on.
  • FIG. 3B is a timing chart illustrating the operation of the APC control circuit after power is turned on.
  • FIG. 3C is a timing chart illustrating the output of the second detection section after power is turned on.
  • FIG. 3D is a timing chart illustrating the operation of the LD output comparison circuit after power is turned on.
  • FIG. 3E is a timing chart illustrating the output from the first detection section after power is turned on.
  • FIG. 3F is a timing chart illustrating the operation of the defect detection circuit after power is turned on.
  • FIG. 4 is a flowchart illustrating the operation of the lighting device.
  • the lighting device is installed in a moving body that is a movable device such as a railway vehicle, a car, a trolley, a ship, an airplane, a helicopter, a drone, and a robot.
  • the illumination device emits illumination light in the direction of movement of the moving object, and projects, for example, information regarding the movement of the moving object onto a road surface or the like.
  • the illumination device projects, as information regarding the progress, for example, an arrow indicating the direction of travel and characters such as "go straight", “turn right”, “decelerate”, and "accelerate”.
  • the illumination device is not limited to one that projects the above-mentioned arrows and characters, but may also project patterns, symbols, marks, illustrations, characters, pictograms, and the like. Note that there is no limit to the number of lighting devices that can be mounted on the moving object, and it may be one, or two or more lighting devices.
  • FIG. 1 is a block diagram showing the main part configuration of the lighting device 10.
  • the illumination device 10 includes a light source 11 , an optical system 12 , a branching section 13 , a diffraction section 14 , a first detection section 15 , a second detection section 16 , and a control circuit 17 .
  • an orthogonal coordinate system consisting of an x-axis and a y-axis is used, as shown in FIG.
  • the x-axis is set in the left-right direction on the paper of FIG. 1, and the y-axis is set perpendicular to the x-axis in the vertical direction on the paper of FIG.
  • the light source 11 is, for example, a laser diode (semiconductor laser), and receives power and emits illumination light L, which is a laser beam (coherent light), in the x-axis + direction.
  • the light source 11 changes the amount of illumination light L under the control of the control circuit 17 . That is, as will be described in detail later, by changing the power (current) supplied under control of the control circuit 17, the amount (intensity) of the illumination light L emitted from the light source 11 is controlled.
  • the branching unit 13 is, for example, an optical member such as a beam splitter or a half mirror, and branches the traveling direction of the incident illumination light L into an x-axis + side and a y-axis + side. That is, the branching part 13 transmits a part of the illumination light L that has proceeded from the optical system 12, and reflects the other part (remaining part) toward the + side of the y-axis.
  • the illumination light L the light that has passed through the branching section 13 is called a first illumination light L1, and the light reflected at the branching section 13 is called a second illumination light L2.
  • the branching section 13 transmits 50% of the illumination light L and reflects the remaining 50%.
  • the optical system 12 is a collimator lens that is arranged on the x-axis + side with respect to the branching part 13 and shapes the first illumination light L1 that has passed through the branching part 13 into parallel light. Although one lens is shown as the optical system 12 in FIG. 1, the optical system 12 may be composed of two or more lenses.
  • the diffraction unit 14 is disposed on the x-axis + side with respect to the optical system 12, and is illuminated by the first illumination light L1 that has passed through the optical system 12.
  • the diffraction section 14 is, for example, a diffraction grating such as a hologram element.
  • a diffraction grating such as a hologram element.
  • the hologram element various known holograms such as Fourier transform type, Fresnel type, computer synthesis type, analog recording type, and relief type can be used. Information regarding the progress of the moving object described above is recorded on this hologram element.
  • a part of the first illumination light L1 that has passed through the branching section 13 passes through the diffraction section 14 and is emitted to the outside of the illumination device 10. As a result, the information recorded in the diffraction section 14 is projected outside the illumination device 10 (that is, in front of the moving body in the traveling direction).
  • the other part (remaining part) of the first illumination light L1 that has passed through the branching part 13 is reflected by the diffraction part 14.
  • This reflected light (reflected light) travels toward the negative side of the x-axis and enters the branching section 13.
  • This reflected light is reflected toward the negative side of the y-axis at the branching section 13 and enters a first detection section 15, which will be described later.
  • the first detection section 15 and the second detection section 16 are, for example, photoelectric conversion elements such as photodiodes.
  • the first detection section 15 is arranged on the negative side of the y-axis with respect to the branching section 13, and the second detection section 16 is arranged on the positive side of the y-axis with respect to the branching section 13.
  • the first illumination light L1 that is reflected by the diffraction part 14 and then reflected by the branching part 13 enters the first detection part 15.
  • the first detection unit 15 converts the incident light into an electrical signal and outputs it to the control circuit 17 as a first detection signal.
  • This electrical signal (that is, the first detection signal) has a value that corresponds to the amount of reflected light that has entered the first detection section 15. Therefore, the first detection unit 15 detects the light amount of the first illumination light L1.
  • the second illumination light L2 is incident on the second detection unit 16.
  • the second detection unit 16 converts the incident second illumination light L2 into an electrical signal and outputs it to the control circuit 17 as a second detection signal.
  • This electric signal (that is, the second detection signal) has a value corresponding to the amount of light incident on the second detection section 16. Therefore, the second detection unit 16 detects the amount of second illumination light L2.
  • the control circuit 17 based on the amount of light detected by the first detection section 15 (reflected light reflected by the diffraction section 14) and the amount of second illumination light L2 detected by the second detection section 16, It includes various circuits that control the illumination light L emitted by the light source 11.
  • FIG. 2 is a block diagram showing the main part configuration of the control circuit 17.
  • the control circuit 17 includes an APC (Auto Power Control) control circuit 170, an LD (Laser Diode) output comparison circuit 171, a light source drive circuit 172, a defect detection circuit 173, and an AND circuit 174. , a delay circuit 175 , an error output circuit 176 , a stop circuit 177 , and a current limiting resistor 178 .
  • APC Auto Power Control
  • LD Laser Diode
  • the APC control circuit 170 includes, for example, a comparator, and compares the reference voltage with the voltage converted from the second detection signal output by the second detection unit 16, which is the light intensity of the second illumination light L2, and determines the voltage according to the comparison result. , outputs a signal (drive signal) indicating a voltage value proportional to the voltage difference to the light source drive circuit 172.
  • the light source drive circuit 172 drives the light source 11 based on the drive signal output from the APC control circuit 170 using the power (drive power) supplied from the power supply section 20 via the current limiting resistor 178.
  • the APC control circuit 170 receives a stop signal output from a stop circuit 177 (described later), it outputs a signal (stop instruction signal) instructing to stop driving the light source 11 to the light source drive circuit 172. Thereby, the APC control circuit 170 stops the light source 11 from emitting the illumination light L.
  • the LD output comparison circuit 171 is, for example, a comparator, and compares the driving power of the light source 11 driven by the light source driving circuit 172 with the reference power for driving the light source 11, thereby determining the illumination light emitted by the light source 11. The presence or absence of an abnormality in L is detected and a signal indicating the detection result is output. Note that the LD output comparison circuit 171 starts operating when the maximum value of the second detection signal output from the second detection section 16 exceeds, for example, 80 percent after the lighting device 10 is powered on.
  • the defect detection circuit 173 is, for example, a comparator, and compares the voltage of the first detection signal outputted by the first detection section 15, which is the light intensity of the first illumination light L1, with a threshold value to detect damage or dropout in the diffraction section 14. It detects the presence or absence of such defects and outputs a signal indicating the detection result.
  • the AND circuit 174 outputs a signal indicating whether there is an abnormality in the light source 11 or the diffraction section 14 based on the signal output from the LD output comparison circuit 171 and the signal output from the defect detection circuit 173.
  • the defect detection circuit 173 starts operating when the maximum value of the first detection signal output from the first detection section 15 exceeds, for example, 80% after the lighting device 10 is powered on.
  • the error output circuit 176 When the LD output comparison circuit 171 detects an abnormality in the illumination light L emitted by the light source 11 or the defect detection circuit 173 detects a defect in the diffraction section 14, the error output circuit 176 outputs an error signal to an external device that the moving body has. (Output to control device (ECU), etc.). The external device that inputs the error signal stops the power supply from the power supply unit 20 to the lighting device 10.
  • ECU Output to control device
  • the stop circuit 177 instructs the APC control circuit 170 to drive the light source 11 when the LD output comparison circuit 171 detects an abnormality in the illumination light L emitted by the light source 11 or when the defect detection circuit 173 detects a defect in the diffraction section 14. make it stop. In this case, the stop circuit 177 outputs a stop signal to the APC control circuit 170.
  • the delay circuit 175 delays the timing at which the error output circuit 176 and the stop circuit 177 start operating when the power is turned on. In other words, when the power is turned on, the delay circuit 175 causes the error output circuit 176 to stop outputting the error signal, and causes the stop circuit 177 to stop outputting the stop signal. Note that details of the processing (illumination method) performed by the control circuit 17 will be described later.
  • the control circuit 17 performs defect detection processing, light amount control processing, and forced stop processing.
  • the control circuit 17 detects a defect such as missing or damaged diffraction section 14 based on the amount of first illumination light L1 detected by first detection section 15.
  • the control circuit 17 controls the amount of illumination light L emitted from the light source 11 based on the amount of second illumination light L2 detected by the second detection unit 16.
  • the control circuit 17 detects a defect in the diffraction section 14 through the defect detection process, or when an abnormality occurs in the amount of illumination light L emitted from the light source 11 through the light amount control process.
  • the light source 11 is made to stop emitting the illumination light L.
  • the control circuit 17 detects the amount of first illumination light L1 that has reached the diffraction section 14 based on the first detection signal output by the first detection section 15. As described above, in the diffraction section 14, a portion of the first illumination light L1 that has arrived is reflected, and this reflected light enters the first detection section 15. Since the reflectance of the diffraction section 14 is a known value determined by the material of the diffraction section 14, etc., the amount of light reflected by the diffraction section 14 and the amount of the first illumination light L1 reaching the diffraction section 14 are different. There is a proportional relationship. From this, the control circuit 17 can treat (detect) the amount of reflected light detected by the first detection section 15 as the amount of light of the first illumination light L1.
  • the defect detection circuit 173 of the control circuit 17 compares the detected light amount of the first illumination light L1 with preset first and second light amounts. Specifically, the defect detection circuit 173 compares the voltage (current) of the first detection signal output from the first detection unit 15 with a first threshold value and a second threshold value corresponding to the first light amount and the second light amount. do.
  • the first light amount is, for example, a value obtained by multiplying the lower limit value of the light amount of the first illumination light L1 by the reflectance of the diffraction section 14.
  • the lower limit value of the light intensity of the first illumination light L1 is the amount necessary for making the projection pattern formed externally by the light emitted from the illumination device 10 visible when the diffraction section 14 is not damaged or missing. This is the value of the amount of light, and is determined based on the results of simulations, etc.
  • the first threshold value is a value determined by taking into consideration the characteristics of the individual components constituting the defect detection circuit 173, the influence of temperature changes, etc., with respect to the voltage (current) corresponding to the first light amount.
  • the lighting device 10 of this embodiment stops the current supply from the power supply unit 20 to the light source 11 when the detected amount of first illumination light L1 is less than or equal to the first amount of light, and the lighting device 10 from the light source 11 stops supplying current to the light source 11. It is necessary to stop the emission of the light L. For this reason, the defect detection circuit 173 outputs an abnormality detection signal indicating that an abnormality has occurred in the diffraction section 14 when the light amount of the first illumination light L1 is less than or equal to the first light amount.
  • the second light amount is, for example, a value obtained by multiplying the upper limit value of the light amount of the first illumination light L1 by the reflectance of the diffraction section 14.
  • the upper limit value of the amount of light of the first illumination light L1 is a value of the amount of light that does not have an adverse effect even if the light emitted from the lighting device 10 enters the eyes of outsiders, and is determined based on the results of simulations etc. .
  • the second threshold value is a value determined by taking into consideration the characteristics of the individual components constituting the defect detection circuit 173, the influence of temperature changes, etc., with respect to the voltage (current) corresponding to the second light amount.
  • the light intensity of the first illumination light L1 is greater than or equal to the second light intensity (if the voltage (current) of the first detection signal is greater than or equal to the second threshold), no abnormality has occurred in the diffraction section 14; It is conceivable that the light amount control process is not performed appropriately due to a failure of the portion 16 or the like, and the amount of the first illumination light L1 passing through the diffraction portion 14 increases. That is, since the amount of light emitted to the outside of the lighting device 10 is too large, there is a possibility that this light may have an adverse effect if it enters the eyes of an outsider.
  • the lighting device 10 stops the current supply from the power supply section 20 to the light source 11, and the illumination light L is emitted from the light source 11. need to be stopped. For this reason, the defect detection circuit 173 outputs an abnormality detection signal indicating that an abnormality has occurred in the diffraction section 14 when the light amount of the first illumination light L1 is equal to or greater than the second light amount.
  • the defect detection circuit 173 outputs a normality detection signal indicating that both the diffraction section 14 and the second detection section 16 are normal.
  • the defect detection circuit 173 detects the presence or absence of a defect in the diffraction section 14 based on the amount of light detected by the first detection section 15.
  • the control circuit 17 treats the amount of reflected light detected by the first detection section 15 as the amount of light of the first illumination light L1.
  • the light amount of the first illumination light L1 that has reached the diffraction section 14 may be detected (calculated) based on the light amount of the reflected light.
  • the first light amount is the lower limit value of the light amount of the first illumination light L1 mentioned above
  • the second light amount is the upper limit value of the light amount of the first illumination light L1 mentioned above.
  • defect detection process described above is executed by the control circuit 17 at predetermined time intervals.
  • the control circuit 17 detects the light amount of the second illumination light L2, that is, the light amount of the illumination light L emitted from the light source 11, based on the second detection signal output by the second detection section 16. Then, the control circuit 17 controls the amount of illumination light L emitted from the light source 11 to a constant value based on the detected amount of second illumination light L2.
  • the second illumination light L2 is the light of the illumination light L that is reflected toward the +y-axis side at the branching portion 13.
  • the control circuit 17 can treat (detect) the light amount of the second illumination light L2 detected by the second detection unit 16 as the light amount of the illumination light L.
  • the APC control circuit 170 of the control circuit 17 compares the voltage of the second detection signal outputted by the second detection unit 16, which is the light intensity of the second illumination light L2, with a reference voltage, and determines the difference in voltage according to the comparison result.
  • a drive signal indicating a voltage value proportional to is output to the light source drive circuit 172.
  • the light source drive circuit 172 drives the light source 11 by supplying power based on the drive signal output from the APC control circuit 170 from the power supply section 20 to the light source 11 via the current limiting resistor 178. Thereby, the electric power (driving electric power) supplied to the light source 11 becomes constant, so that the illumination light L output from the light source 11 can be controlled to have a constant light amount.
  • the LD output comparison circuit 171 is, for example, a comparator, and compares the drive power actually supplied to the light source 11 by the light source drive circuit 172 with a specified power, and outputs a signal based on the comparison result. In this case, the LD output comparison circuit 171 determines that an abnormality has occurred in the light source 11 or the second detection unit 16 when the difference between the drive power supplied to the light source 11 and the specified power exceeds a preset threshold. Outputs a signal (abnormality detection signal) indicating that the The LD output comparison circuit 171 determines that no abnormality has occurred in the light source 11 and the second detection unit 16 when the difference between the drive power supplied to the light source 11 and the specified power is less than or equal to a preset threshold.
  • a signal abnormality detection signal
  • the LD output comparison circuit 171 functions as an abnormality detection circuit that detects whether or not there is an abnormality in the illumination light L emitted from the light source 11 based on the amount of light detected by the second detection section 16.
  • the threshold value is a value determined by taking into consideration the characteristics of the individual components constituting the LD output comparison circuit 171, the influence of temperature changes, and the like.
  • the control circuit 17 causes the light source 11 to stop emitting the illumination light L.
  • the AND circuit 174 outputs a normal signal when the defect detection circuit 173 and the LD output comparison circuit 171 output normal detection signals.
  • the AND circuit 174 outputs an abnormality signal when an abnormality detection signal is output from at least one of the defect detection circuit 173 and the LD output comparison circuit 171.
  • the stop circuit 177 receives the abnormal signal output from the AND circuit 174, it outputs a stop signal to the APC control circuit 170 via a delay circuit 175, which will be described later.
  • the APC control circuit 170 receives the stop signal, it stops outputting a signal indicating a voltage value to the light source drive circuit 172, thereby causing the light source drive circuit 172 to stop driving the light source 11.
  • the abnormal signal output from the AND circuit 174 is also input to the error output circuit 176.
  • the error output circuit 176 receives this abnormal signal, it outputs an error signal to an external device provided in the moving object, as described above.
  • the first detection section 15 and the second detection section 16 do not output the first detection signal and the second detection signal, or the first detection signal and the second detection section 16 do not output the first detection signal and the second detection signal.
  • the detection signal output is not sufficient.
  • the LD output comparison circuit 171 and the defect detection circuit 173 cannot perform accurate detection (operation is not stable), and an abnormality detection signal is output.
  • the stop circuit 177 outputs a stop signal to the APC control circuit 170, and the APC control circuit 170 stops the light source 11 from emitting the illumination light L. I'll let you.
  • the error output circuit 176 also outputs an error signal to the external device, and power is no longer supplied to the lighting device 10. As a result, there is a possibility that a problem may occur in which the illumination light L is not emitted even though the power is turned on. In order to suppress the occurrence of such problems, the control circuit 17 performs delay processing as described below.
  • the delay circuit 175 outputs an error signal from the AND circuit 174. There is no output to the output circuit 176 and stop circuit 177. That is, the delay circuit 175 causes the stop circuit 177 to stop outputting the stop signal until the operations of the LD output comparison circuit 171 and the defect detection circuit 173 become stable. In other words, the delay circuit 175 is stopped by the stop circuit 177 based on the abnormality detection signals output from the LD output comparison circuit 171 and the defect detection circuit 173 until the operations of the LD output comparison circuit 171 and the defect detection circuit 173 become stable. Do not start outputting the signal.
  • the state in which the operations of the LD output comparison circuit 171 and the defect detection circuit 173 are stable is a state in which the outputs of the first detection signal and the second detection signal exceed preset threshold values.
  • This threshold value is a value determined by taking into consideration the characteristics of the individual components constituting the first detection section 15 and the second detection section 16, the influence of temperature changes, and the like.
  • FIGS. 3A to 3F are timing charts showing the operating states of each part of the control circuit 17 when delay processing is performed.
  • the APC control circuit 170 when power is supplied from the power supply section 20 to the control circuit 17 at time t1, the APC control circuit 170 also starts operating at time t1, as shown in FIG. 3B.
  • the illumination light L is emitted from the light source 11.
  • the second detection unit 16 that has received the second illumination light L2 of the illumination light L emitted from the light source 11 starts outputting the second detection signal.
  • the first detection section 15 that has received the light reflected by the diffraction section 14 of the first illumination light L1 starts outputting the first detection signal.
  • the amount of light incident on the first detection section 15 and the second detection section 16 increases and exceeds 80% of the maximum value of the output first detection signal and second detection signal. Then, as shown in FIG. 3D, the LD output comparison circuit 171 starts operating. Similarly, as shown in FIG. 3F, the defect detection circuit 173 starts operating at time t3.
  • the delay circuit 175 releases the stop circuit 177 from outputting the stop signal. Thereafter, when the abnormality detection signal is output from the LD output comparison circuit 171 and the defect detection circuit 173, the stop circuit 177 outputs a forced stop signal.
  • FIG. 4 is a flowchart illustrating the operation of the control circuit 17 that performs delay processing.
  • step S1 the lighting device 10 is powered on at time t1, and the APC control circuit 170 starts operating.
  • step S2 the light source drive circuit 172 causes the light source 11 to emit illumination light L based on the drive signal output from the APC control circuit 170.
  • the second illumination light L2 of the emitted illumination light L enters the second detection section 16, and the light reflected by the diffraction section 14 of the first illumination light L1 enters the first detection section 15.
  • step S3 the first detection section 15 and the second detection section 16 start outputting the first detection signal and the second detection signal at time t2.
  • step S4 the LD output comparison circuit 171 and the defect detection circuit 173 start operating at time t3 when the output of the first detection signal and the second detection signal exceeds 80% of the maximum value.
  • step S5 the LD output comparison circuit 171 and the defect detection circuit 173 perform stable operations at time t4 when the output of the second detection signal exceeds the threshold value.
  • the delay circuit 175 releases the stop circuit 177 from stopping the output of the stop signal, and the error output circuit 176 from stopping the output of the error signal. This ends the delay processing.
  • the control circuit 17 of the lighting device 10 includes a delay circuit 175 that causes the stop circuit 177 to stop outputting the stop signal from when the LD output comparison circuit 171 and the defect detection circuit 173 start operating until the operations become stable. Be prepared. As a result, the stop signal is output by the stop circuit 177 after power is turned on to the illumination device 10, and the occurrence of a problem in which the illumination light L is not emitted even though the power is turned on is suppressed.
  • the control circuit 17 When the LD output comparison circuit 171 detects an abnormality in the illumination light L and the defect detection circuit 173 detects a defect in the diffraction section 14, the control circuit 17 outputs an error signal to an external device. An output circuit 176 is provided. Thereby, even if the stop circuit 177 cannot output a stop signal due to a failure or the like, it is possible to stop the light source 11 from emitting the illumination light L via the external device.
  • the delay circuit 175 causes the error output circuit 176 to stop outputting the error signal until the operations of the LD output comparison circuit 171 and the defect detection circuit 173 become stable. This prevents the error output circuit 176 from outputting an error signal after power is turned on to the lighting device 10, and the problem that the illumination light L is not emitted even though the power is turned on can be suppressed. .
  • the branching section 13 is arranged before the optical system 12 (on the x-axis ⁇ side), and the optical system 12 converts the first illumination light L1 branched by the branching section 13 into parallel light. It is not limited to things to be shaped.
  • the optical system 12 may be disposed upstream of the branching section 13 (on the -x-axis side), and the branching section 13 may branch the illumination light L shaped into parallel light by the optical system 12.

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  • Semiconductor Lasers (AREA)

Abstract

Selon un mode de réalisation de la présente invention, un dispositif d'éclairage comprend : une source de lumière (11) qui émet une lumière d'éclairage ; une première unité de détection (15) qui détecte une quantité de lumière réfléchie par une partie de diffraction parmi une première lumière d'éclairage dérivée de la lumière d'éclairage ; une seconde unité de détection (16) qui détecte une quantité d'une seconde lumière d'éclairage dérivée de la lumière d'éclairage ; un circuit de comparaison de sortie LD (171) qui détecte la présence ou l'absence d'une anomalie dans la lumière d'éclairage sur la base de la quantité de lumière détectée par la seconde unité de détection (16) ; un circuit de détection de défaut (173) qui détecte la présence ou l'absence d'un défaut dans la partie de diffraction sur la base de la quantité de lumière détectée par la première unité de détection (15) ; un circuit d'arrêt (177) qui délivre en sortie à la source de lumière (11) un signal d'arrêt visant à arrêter l'émission d'une lumière d'éclairage lorsqu'une anomalie dans la lumière d'éclairage est détectée par le circuit de comparaison de sortie LD (171) ou lorsqu'un défaut dans la partie de diffraction est détecté par le circuit de détection de défaut (173) ; et un circuit de retard (175) qui arrête la sortie du signal d'arrêt par le circuit d'arrêt (177) jusqu'à ce que le fonctionnement du circuit de comparaison de sortie LD (171) et du circuit de détection de défaut (173) devienne stable.
PCT/JP2023/019005 2022-05-27 2023-05-22 Dispositif et procédé d'éclairage WO2023228914A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011527518A (ja) * 2008-07-07 2011-10-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 目に安全なレーザに基づく照明
JP2019120946A (ja) * 2017-12-27 2019-07-22 国立研究開発法人産業技術総合研究所 ガラス蛍光体および照明装置
JP2019120812A (ja) * 2018-01-09 2019-07-22 カシオ計算機株式会社 異常検出装置、投影装置、異常検出方法、及びプログラム

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011527518A (ja) * 2008-07-07 2011-10-27 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 目に安全なレーザに基づく照明
JP2019120946A (ja) * 2017-12-27 2019-07-22 国立研究開発法人産業技術総合研究所 ガラス蛍光体および照明装置
JP2019120812A (ja) * 2018-01-09 2019-07-22 カシオ計算機株式会社 異常検出装置、投影装置、異常検出方法、及びプログラム

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