WO2011086849A1 - 映像投影装置および映像投影方法 - Google Patents
映像投影装置および映像投影方法 Download PDFInfo
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- WO2011086849A1 WO2011086849A1 PCT/JP2010/073678 JP2010073678W WO2011086849A1 WO 2011086849 A1 WO2011086849 A1 WO 2011086849A1 JP 2010073678 W JP2010073678 W JP 2010073678W WO 2011086849 A1 WO2011086849 A1 WO 2011086849A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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- 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
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- 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
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
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- 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
- G03B21/28—Reflectors in projection beam
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
- H04N9/3135—Driving therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
Definitions
- the present invention relates to a video projection apparatus and a video projection method.
- the present invention relates to an image projection apparatus and an image projection method for projecting an image by scanning a laser light source.
- lasers In order to ensure the safety of lasers, it is decided to classify lasers according to standards such as IEC60825 and JIS6802 and to follow the usage method according to the class. Lasers are classified into seven stages of classes 1, 1M, 2, 2M, 3R, 3B, and 4, and the usage and environment of use are limited depending on each class. Here, the seven classes are described in IEC 60825-1 issued in 2007. In the following explanation, explanation will be made in accordance with the IEC.
- IEC 60825-1 uses a pulse time width as a time for a laser to pass through a 7 mm diameter opening imitating a human eye placed at a certain distance from a scanning unit, and the number of times the laser passes through this opening. It is stipulated that safety is evaluated using a repetitive pulse train with the number of pulses. In addition, IEC 60825-1 defines that safety is evaluated under the strictest condition among the following three conditions regarding a repetitive pulse train. Here, as an example, the calculation is shown according to the definition of class 2. Here, C 6 is the correction factor which depends on the size of the light source defined by the standard, t is the pulse time width, N is the number of pulses, is ⁇ is the circular constant.
- the first condition is that the exposure from any single pulse in the pulse train must not exceed the AEL (Accessible Emission Limit) for a single pulse.
- the second condition is that the average power of the pulse train within the emission duration should not exceed the AEL of a single pulse of emission duration.
- the first condition is always looser than the third condition, so there is no need to consider the first condition.
- the end portion is the position where the exposure dose is maximized. There are two reasons for this. The first reason is that when the laser is turned back, the laser is irradiated continuously for a time twice as long as one-way scanning. The second reason is that, particularly when the scanning element is a device using resonance, the scanning speed of the laser is remarkably reduced at the end.
- the upper limit of the laser output is determined at the end with the largest exposure amount, and the end determines the brightness of the entire screen. At the end, the number of pulses is halved and the passing time is doubled.
- the upper limit of the laser output was determined at the end with the largest exposure amount, and the end determined the brightness of the entire screen.
- the upper limit of the laser output is determined according to safety standards. For this reason, there has been a problem that ensuring safety and increasing screen brightness cannot be achieved at the same time.
- An object of the present invention is to provide a video projection apparatus and a video projection method that solve the above-described problems.
- the present invention provides a laser light source unit that emits a laser and one or more scanning directions, and performs a reciprocating scanning of the laser in a scanning direction having the highest scanning frequency to display an image.
- the scanning angle when the laser emission is stopped in the forward path is different from the scanning angle when the laser emission is started in the backward path.
- the image projection apparatus includes a control unit that controls operations of the laser light source unit and the laser scanning unit according to a signal.
- the present invention is also directed to the scanning direction in which a laser is emitted, the laser is reciprocated with respect to a scanning direction having the highest scanning frequency among one or more scanning directions, an image is projected, and the reciprocating scanning is performed.
- the scanning angle when stopping the laser emission in the forward path and the scanning angle when starting the laser emission in the backward path are different. This is a video projection method for controlling scanning.
- the present invention relates to a laser light source unit that emits a laser, and a laser scanning unit that has one or more scanning directions and projects the image by reciprocating the laser at a predetermined scanning period with respect to the scanning direction having the highest scanning frequency.
- the time difference between the laser emission stop time in the forward path and the laser emission start time in the return path is determined as a single pulse between adjacent pulses of the laser.
- a control unit that controls the operation of the laser light source unit and the laser scanning unit in accordance with the video signal so that the interval is longer than half of the interval, and the predetermined scanning cycle is the time difference ⁇ 2 ⁇
- An image projection apparatus that is longer than the rate R) of lowering the laser output upper limit when the adjacent pulses of the laser are regarded as a single pulse at the reciprocation position of the reciprocating scanning; It is. Further, the present invention emits a laser, reciprocates the laser at a predetermined scanning period in a scanning direction having the highest scanning frequency among one or more scanning directions, projects an image, and performs reciprocating scanning.
- the time difference between the laser emission stop time in the forward path and the laser emission start time in the backward path is greater than half of the interval between the pulses that consider adjacent pulses of the laser as a single pulse.
- the laser emission and the laser scanning are controlled in accordance with the video signal so as to be long, and the predetermined scanning period is set to the time difference ⁇ 2 ⁇ (1 ⁇ the adjacent pulse of the laser at the turn-back position of the reciprocating scanning. Is set so as to be longer than the rate R) of lowering the upper limit of the output of the laser when it is regarded as a single pulse.
- the present invention relates to a laser light source unit that emits a laser, a laser scanning unit that has one or more scanning directions and reciprocally scans the laser in a scanning direction with the highest scanning frequency, and projects an image.
- the period for emitting and the period for stopping the emission of the laser are repeated, and the period for stopping the emission of the laser corresponds to the size of the eye at a position away from the focus of the eye.
- the laser light source unit and the laser scanning unit according to the video signal so that the range becomes longer than the time corresponding to the angle required for the laser scanning unit to scan along the scanning direction with the highest scanning frequency. It is a video projection apparatus provided with the control part which controls operation
- a laser is emitted, the laser is reciprocally scanned in a scanning direction having the highest scanning frequency among one or more scanning directions, an image is projected, and the laser is emitted.
- a period in which the emission of the laser beam is alternately repeated, and a period in which the laser beam emission is continuously stopped has a range corresponding to the size of the eye at a position separated by a distance where the eye is focused.
- the present invention includes a laser light source unit that emits a laser, a laser scanning unit that has one or more scanning directions and reciprocally scans the laser in a scanning direction with the highest scanning frequency, and projects an image, and the laser light source.
- a video projection device comprising a unit.
- a laser is emitted, the laser is reciprocally scanned in a scanning direction having the highest scanning frequency among one or more scanning directions, an image is projected, and the output of the laser is
- the image projection method controls emission of the laser and scanning of the laser in accordance with an image signal so as to be proportional to the scanning angular velocity or the scanning velocity of the laser on the projection surface.
- the laser beam emission time is controlled in accordance with the scanning of the laser, and the exposure dose of the laser at the end, which is the portion with the largest exposure dose in the related technology. Can be reduced. Thereby, it is possible to provide means for simultaneously achieving safety and improving screen brightness, and a video projection apparatus and video projection method having the control means.
- FIG. 7 is a block diagram showing an example of the configuration of a video projector according to the basic form of the present invention and the first to fifth embodiments. It is a figure which shows the time displacement of the scanning angle and laser output in a basic form. It is a figure which shows the time displacement of the scanning angle and laser output in a basic form. It is a figure which shows the time displacement of the scanning angle and laser output in a basic form and 1st Embodiment. It is a figure which shows the time displacement of the scanning angle and laser output in a basic form and 1st Embodiment. It is a figure which shows the relationship between the laser emission time in a basic form, and an output ratio.
- FIG. 1 shows a configuration example of a video projection apparatus according to the basic form of the present invention.
- the image projection apparatus 100 includes a laser light source unit 110 that emits a laser, a laser scanning unit 120, and a control unit 130.
- the angle (direction) of the laser emitted from the laser light source unit 110 is changed by the laser scanning unit 120 and scanned on the projection surface 200.
- the control unit 130 projects the image corresponding to the video signal onto the projection surface 200 by controlling the light source output and output time of the laser light source unit 110 and the scanning element of the laser scanning unit 120 according to the video signal.
- the laser light source unit 110 emits one or more beams having one optical axis.
- the laser light source unit 110 has one or more laser light sources inside. When a plurality of laser light sources are provided, the laser light source unit 110 has a structure for combining beams from these laser light sources into one beam.
- the laser light source unit 110 may include one laser light source, and the laser light source unit 110 may have a structure that does not have a multiplexing unit.
- red wavelength: 640 nm
- green wavelength: 530 nm
- blue wavelength: 450 nm
- a structure that combines the three wavelengths of the representative example) is conceivable.
- other wavelengths such as yellow (580 nm).
- Combiners that are means for synthesizing lasers include a combiner that uses a wavelength-selective mirror, a combiner that uses a semi-transmissive mirror, a combiner that uses a polarization-selective mirror, a fiber type combiner, and a waveguide type combiner.
- the laser light source included in the laser light source unit 110 is controlled in emission time and output according to the video signal and the laser scanning unit 120.
- the laser scanning unit 120 includes one or more scanning elements, and scans the laser in one or more directions to change the traveling direction of the laser light incident on the laser scanning unit 120 from the laser light source unit 110.
- the laser scanning unit 120 may have a structure in which a single scanning element realizes scanning in a plurality of directions, or may have a structure in which a plurality of scanning elements independently realize scanning in each scanning direction.
- the laser scanning unit 120 is controlled by the control unit 130.
- resonant vibration mirror For the scanning element, resonant vibration mirror, galvano scanner, GLV (Grating Light Valve), polygon scanner, AOM (Acoustic Optic Modulator) crystal, KTP (KTiOPO4) crystal, liquid crystal, and other vibrations manufactured using MEMS technology
- optical elements such as lenses and mirrors.
- the image projection apparatus 100 may have a function of monitoring the states of the laser light source unit 110 and the laser scanning unit 120 and sending the results to the control unit 130.
- a method of monitoring these states from laser light there is a method of using a light receiving element such as PD (Photo Diode).
- the control unit 130 has a function of controlling the laser light source unit 110 and the laser scanning unit 120 in accordance with the video signal.
- the control unit 130 may have a function of receiving a signal from the laser light source unit 110 and the laser scanning unit 120 and changing a control method and a control parameter.
- the control unit 130 controls the laser light source unit 110 so that the laser is emitted in both the forward path and the backward path in the scanning direction in which the laser scanning unit 120 has the highest scanning frequency.
- the control unit 130 controls the emission stop time and the emission start time at the time of drawing in the forward path and the return path in the scanning direction having the highest scanning frequency among the scanning directions of the laser scanning unit 120.
- IEC60825 stipulates that pulses are regarded as identical (considered as a single pulse) when the interval between adjacent pulses in a repetitive pulse train is 18 ⁇ s or less. This definition is made because when a new laser is irradiated within a short time, the influence of the previously incident laser cannot be alleviated.
- the pulses are regarded as the same. Assuming that the pulses are the same at the ends, the laser output upper limit is 2 ⁇ 3/4 ⁇ 0.6 times as described above.
- a control method for avoiding this can be realized by providing a non-light-emission time longer than 18 ⁇ s at the end turning point as shown in FIG. By providing the non-emission time, it is possible to increase the output of the laser beam.
- the above control method is used when the required non-light emission time ratio is less than 40% with respect to 1 ⁇ 2 of the scanning period. Is valid.
- the screen brightness is calculated by the following formula.
- the output can be increased using the above control method. ⁇ Time for the laser to pass through the aperture at the end ⁇ / ⁇ Time for the laser to pass through the aperture at a position where the exposure dose becomes maximum after control ⁇ ⁇ ⁇ Laser irradiation time after control ⁇ ⁇ ⁇ Laser before control Irradiation time ⁇
- the luminance can be improved using the above control method when the scanning cycle T satisfies the condition of the expression (1).
- a change in speed of a resonant device is generally characterized by a decrease in the speed of the edge. When the speed decreases, this corresponds to an increase in the time for passing through the opening, resulting in a decrease in the output limit. Therefore, by providing the non-light emission time as described above, it is possible to avoid light emission at the end portion where the speed is the slowest and increase the laser output.
- FIG. 1 A specific example is shown in FIG.
- the scanning element performs a resonance operation and the luminance is calculated at a scanning period of 50 ⁇ s and a scanning angle of 30 deg (degrees)
- the display period when the display period is set to 80%, it is 1. Four times the brightness. Further, when the display period is set to 70%, the luminance is 1.5 times that when the display period is set to 100%. Furthermore, this effect is maximized when the display period is set to 60%, and the luminance is 1.6 times that when the display period is set to 100%.
- the time from when the laser passes through the opening at the end until the laser re-enters the opening is longer than 18 ⁇ s. It is possible to achieve 1.7 times the luminance as compared to when the display period is set.
- the brightness can be improved by using the above control when the scanning cycle T is as follows.
- the laser may not be emitted to the turning point, and the emission may be stopped at a smaller scanning angle. However, laser output should not be continued continuously beyond the end before turning back.
- no light emission time is provided on the forward path, and no light emission time is provided on the return path. However, no light emission time may be provided on the forward path and no light emission time may be provided on the return path.
- a specific example is shown as reciprocating single irradiation in FIG.
- the scanning element performs a resonance operation, and the output is calculated at a scanning period of 50 ⁇ s and a scanning angle of 30 deg, when the display period is set to 80%, it is 1.6 times that when the display period is set to 100%. Output. Further, when the display period is set to 60%, the output is 2.1 times that when the display period is set to 100%. Further, this effect is maximized when the display time is set to 35%, and the output is 2.4 times that when the display time is set to 100%.
- the time from when the laser passes through the opening at the end until the laser re-enters the opening is longer than 18 ⁇ s. It is possible to achieve a luminance of 3.9 times that when the display period is set.
- FIG. 1 is a block diagram showing the configuration of the video projector according to the first embodiment, and the configuration is as described above.
- the control method of the first embodiment is shown in FIG. 4, FIG. 5, and FIG.
- the control unit 130 electrically controls the output of the laser light source unit 110 so that the emission stop position in the forward path and the scan stop position in the return path are different with respect to the scanning direction of the reciprocating drawing of the laser scanning unit 120.
- the laser output becomes larger when the same safety is used as a standard.
- An increase in brightness can be achieved when the increase in laser output is greater than the decrease in irradiation time due to stopping laser emission.
- the scanning angular velocity decreases as the scanning angle increases, even if the time from the return position to the start of laser output is not longer than 9 ⁇ s, at the end As a result of stopping the laser emission, it is possible to reduce the exposure amount at the portion where the scanning speed becomes slow, and to improve the safety (FIGS. 5 and 7).
- the output period of the forward path may be long and the output period of the return path may be short (FIGS. 4 and 5), or the output period of the forward path is short and the output period of the return path is long. (FIG. 7). That is, as indicated by the reference symbol N4 in FIG. 4 and the reference symbol N5 in FIG. 5, the emission stop position may be in front of the folded portion. Further, as indicated by reference numeral N7 in FIG. 7, the emission start position may be later than the turn-up portion.
- the laser may not be emitted to the turning point, and the emission may be stopped before that.
- laser output should not be continued continuously beyond the end before turning back. This is because the end portion has the largest exposure dose.
- FIG. 8 shows a control method according to the second embodiment.
- the laser emission is stopped and started alternately in both the forward path and the return path.
- laser emission is stopped in at least one of the forward path and the return path.
- the period in which the laser output is stopped is a period in which the image signal is originally output, and in the case of a raster scan type video projection apparatus, the number of resolution pixels is reduced.
- the laser emission is not completely eliminated, and it is possible to suppress a decrease in resolution. It is.
- an angle larger than 4 deg is scanned after the laser output is stopped until the laser output is started again (one section).
- This angle is an angle necessary for the laser to pass through the opening when a 7 mm opening imitating the eye is arranged at a position separated by 100 mm where the human eye is focused.
- this angle is used when the laser scanning unit 120 scans a range corresponding to the size of the eye along the scanning direction of the reciprocating drawing at a position away from the laser scanning unit 120 by a distance where the eye is focused. It is a necessary angle.
- one section is 4 deg or less, two or more pulses enter the opening. Further, it is more desirable from the viewpoint of safety that the outgoing position on the forward path and the outgoing position on the return path do not overlap.
- the video projection apparatus has the same configuration as the video projection apparatuses according to the first and second embodiments.
- the control method of the third embodiment is shown in FIG.
- the control unit 130 controls the laser light source unit 110 so that the laser output becomes smaller (that is, the laser output becomes smaller in proportion to the scanning angular velocity) as the scanning angular velocity becomes slower (as the scanning angular velocity becomes smaller). Since the laser output is small at the end where the speed is low, safety can be ensured.
- the illuminance at a certain position is calculated from the integration of the output and time of the laser irradiated to that position.
- the laser irradiation time is inversely proportional to the scanning speed on the projection surface 200.
- the laser output in order to make the illuminance constant on the screen, it is desirable to control the laser output so as to be proportional to the speed on the projection surface 200. Further, there may be a time for stopping the emission of the laser at the turning position.
- FIG. 1 A fourth embodiment of the present invention will be described.
- the video projection device according to the present embodiment has the same configuration as the video projection device according to the first to third embodiments.
- the control method of the fourth embodiment is shown in FIG.
- the control of the method described in the basic mode and the first to third embodiments is switched in accordance with the scanning cycle in the scanning direction other than the scanning direction with the highest speed (the highest scanning frequency).
- the frame rate of video corresponds to the above cycle.
- FIG. 11 shows a method of switching the control of the emission stop position in the forward path and the backward path in the first embodiment for each frame.
- the scanning angle for stopping emission and the scanning angle for starting emission are switched between the odd-numbered frame and the even-numbered frame.
- the video projection device according to the present embodiment has the same configuration as the video projection device according to the first to fourth embodiments.
- the conceptual diagram and control method of the fifth embodiment are shown in FIGS.
- the scanning angle in the high-speed scanning direction may change or the scanning angle in the high-speed scanning direction may be changed according to the scanning angle in the low-speed scanning direction and the scanning cycle. .
- the first scanning direction is the x direction and the second scanning direction is y.
- the direction Assume that reciprocating drawing is performed at high speed along the first scanning direction.
- a projection view in this case is shown in FIG.
- the range of the scan angle in the x direction differs depending on the scan angle in the y direction.
- the emission stop time and the emission start time along the second scanning direction as shown in FIG. That is, as indicated by reference numeral N13a in FIG. 13, control is performed so that the range of the scanning angle differs for each line. Accordingly, the emission stop position and the emission start position are controlled for each line as indicated by reference numeral N13b in FIG. Further, by controlling the emission stop time and controlling the emission stop position in the x direction on the screen, it is possible to project a video of a desired shape and provide a high quality video.
- the shape is arbitrary and is not limited to a square.
- FIG. 14 is a block diagram showing a configuration of a video projection apparatus 300 according to the sixth embodiment.
- partial transmission mirrors 340a and 340b that change a part of the optical path of the laser are arranged in the scanning range scanned by the laser scanning unit 320, and the part of the laser whose optical path is changed is received by the light receiving element 350a.
- 350b A signal indicating the detection result of the light receiving elements 350a and 350b is transmitted to the control unit 330 and used for the control.
- Other configurations for example, the laser light source unit 310 and the projection surface 400 are the same as those of the video projector described in the first to fifth embodiments.
- the light receiving elements 350a and 350b are arranged at locations corresponding to the laser emission stop position and the emission start position. Then, if one light receiving element senses light in the forward path, the control described in the second embodiment is started from that timing, and if the other light receiving element senses light in the return path, from that timing Control is performed so that laser emission is continuously performed again. As a result, the second embodiment can be easily implemented.
- the partial transmission mirrors 340a and 340b have high transmittance so as not to reduce the luminance.
- Examples include glass. PD or the like can be used as the light receiving elements 350a and 350b.
- the standard will be revised in the future and the standard for classification will be revised.
- the safety standard is created in consideration of the tolerance of human eyes, and the significance of the present invention does not change.
- the present invention can be used, for example, in an image projection apparatus that projects an image by scanning a laser light source.
- ensuring safety and improving screen brightness can be achieved simultaneously.
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Abstract
Description
上記課題を解決するために、本発明は、レーザを射出するレーザ光源部と、1つ以上の走査方向をもち、最も走査周波数が高い走査方向に関して、前記レーザの往復走査を行って、映像を投影するレーザ走査部と、往復走査を行う前記走査方向に関して、往路において前記レーザの出射を停止する時の走査角度と、復路において前記レーザの出射を開始する時の走査角度が異なるように、映像信号に応じて前記レーザ光源部及び前記レーザ走査部の動作を制御する制御部とを備える映像投影装置である。
また、本発明は、レーザを射出し、1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して、前記レーザの往復走査を行って、映像を投影し、往復走査を行う前記走査方向に関して、前記往路において前記レーザの出射を停止する時の走査角度と、前記復路において前記レーザの出射を開始する時の走査角度が異なるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御する映像投影方法である。
また、本発明は、レーザを射出し、1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して所定の走査周期で前記レーザを往復走査して、映像を投影し、往復走査を行う前記走査方向に関して、往路における前記レーザの出射停止時間と、復路における前記レーザの出射開始時間との時間差が、前記レーザの隣接するパルスを単一のパルスとみなす前記パルス間の間隔の半分よりも長くなるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御し、前記所定の走査周期を前記時間差×2÷(1-前記往復走査の折返し位置で前記レーザの隣接するパルスを単一のパルスとみなしたときに前記レーザの出力上限を低下させる割合R)よりも長くなるように設定する映像投影方法である。
また、本発明は、レーザを射出し、1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して前記レーザを往復走査して、映像を投影し、前記レーザを出射する期間と前記レーザの出射を停止する期間とが交互に繰り返され、かつ、前記レーザの出射を連続して停止する期間が、眼のフォーカスがあう距離だけ離れた位置で前記眼の大きさに相当する範囲を前記最も走査周波数が高い走査方向に沿って走査するのに必要な角度に対応する時間よりも長くなるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御する映像投影方法である。
図1に本発明の基本形態に係る映像投影装置の一構成例を図示する。映像投影装置100は、レーザを射出するレーザ光源部110と、レーザ走査部120と、制御部130とで構成される。
{端部でレーザが開口を通過する時間}÷{制御後において、被ばく量が最大となる位置でレーザが開口を通過する時間}×{制御後のレーザの照射時間}÷{制御前のレーザの照射時間}
なお、図4では、往路においては無発光時間を設けず、復路において無発光時間を設けた。しかし、往路において無発光時間を設け、復路においては無発光時間を設けないようにしてもよい。
本発明の第1の実施形態について説明する。図1は第1の実施形態に係る映像投影装置の構成を示すブロック図であり、その構成は上述したとおりである。第1の実施形態の制御方法を図4、図5、および図7に示す。レーザ走査部120の往復描画の走査方向に関して、往路における出射停止位置と、復路における走査停止位置が異なるように、制御部130が、レーザ光源部110の出力を電気的に制御する。
本発明の第2の実施形態について説明する。本実施形態に係る映像投影装置は、第1の実施形態に係る映像投影装置と同様の構成である。第2の実施形態に係る制御方法を図8に示す。第1の実施形態において、往路または復路でレーザの出射を停止していた範囲(すなわち、端部における18μs以内の範囲)において、往路および復路の双方において、レーザの出射の停止および開始を交互に行う。
本発明の第3の実施形態について説明する。本実施形態に係る映像投影装置は、第1の実施形態および第2の実施形態に係る映像投影装置と同様の構成である。第3の実施形態の制御方法を図9に示す。走査角速度が遅くなるほど(走査角速度が小さくなるほど)レーザ出力を小さくするように(すなわち、走査角速度に比例してレーザ出力が小さくなるように)、制御部130がレーザ光源部110を制御する。速度が遅くなる端部においては、レーザ出力が小さくなるので、安全性を確保することができる。
本発明の第4の実施形態について説明する。本実施形態に係る映像投影装置は、第1の実施形態から第3の実施形態に係る映像投影装置と同様の構成である。第4の実施形態の制御方法を図11に示す。本実施形態では、最も高速な(最も走査周波数が高い)走査方向以外の走査方向の走査周期に合わせて、基本形態および第1の実施形態から第3の実施形態に記載の方法の制御を切換える。なお、例えば、ある走査型映像装置では映像のフレームレートが上記周期に相当する。
本発明の第5の実施形態について説明する。本実施形態に係る映像投影装置は、第1の実施形態から第4の実施形態に係る映像投影装置と同様の構成である。第5の実施形態の概念図および制御方法を図12および図13に示す。走査素子を複数方向に走査する場合、低速な走査方向の走査角度や走査周期に応じて、高速な走査方向の走査角度が変化することや、高速な走査方向の走査角度を変化させることがある。このような場合などに、1ラインごとに制御方法やパラメータを変化させることで、より高輝度および高画質な映像投射をすることができる。
本発明の第6の実施形態について説明する。図14は第6の実施形態に係る映像投影装置300の構成を示すブロック図である。第6の実施形態では、レーザ走査部320が走査する走査範囲内に、レーザの一部の光路を変化させる部分透過鏡340aおよび340bを配置し、光路が変わった一部のレーザを受光素子350aおよび350bにそれぞれ入射させる。受光素子350aおよび350bの検知結果を示す信号は制御部330に送信され、その制御に利用される。その他の構成(例えば、レーザ光源部310および被投射面400)は、第1の実施形態~第5の実施形態で説明した映像投影装置と同様である。
110 レーザ光源部
120 レーザ走査部
130 制御部
200 被投射面
300 映像投影装置
310 レーザ光源部
320 レーザ走査部
330 制御部
340a,340b 部分透過鏡
350a,350b 受光素子
400 被投射面
Claims (16)
- レーザを射出するレーザ光源部と、
1つ以上の走査方向をもち、最も走査周波数が高い走査方向に関して、前記レーザの往復走査を行って、映像を投影するレーザ走査部と、
往復走査を行う前記走査方向に関して、往路において前記レーザの出射を停止する時の走査角度と、復路において前記レーザの出射を開始する時の走査角度が異なるように、映像信号に応じて前記レーザ光源部及び前記レーザ走査部の動作を制御する制御部と
を備える映像投影装置。 - レーザを射出するレーザ光源部と、
1つ以上の走査方向をもち、最も走査周波数が高い走査方向に関して所定の走査周期で前記レーザを往復走査して、映像を投影するレーザ走査部と、
往復走査を行う前記走査方向に関して、往路における前記レーザの出射停止時間と、復路における前記レーザの出射開始時間との時間差が、前記レーザの隣接するパルスを単一のパルスとみなす前記パルス間の間隔の半分よりも長くなるように、映像信号に応じて前記レーザ光源部及び前記レーザ走査部の動作を制御する制御部と
を備え、
前記所定の走査周期は、前記時間差×2÷(1-前記往復走査の折返し位置で前記レーザの隣接するパルスを単一のパルスとみなしたときに前記レーザの出力上限を低下させる割合R)よりも長い映像投影装置。 - 前記制御部は、前記時間差が前記間隔よりも長くなり、前記所定の走査周期が、前記間隔よりも長い前記時間差×2÷(1-R)よりも長くなるように、前記レーザ光源部及び前記レーザ走査部の動作を制御する請求項2に記載の映像投影装置。
- 前記制御部は、往復走査を行う前記走査方向に関して、前記往路において前記レーザの出射を停止する時の走査角度と、前記復路において前記レーザの出射を開始する時の走査角度が異なるように制御を行う請求項2に記載の映像投影装置。
- 前記制御部が、往復走査を行う前記走査方向に関して、前記往路において前記レーザの出射を停止する時の前記走査角度よりも、前記復路において前記レーザの出射を開始する時の前記走査角度が、小さくなるように制御を行う
請求項4に記載の映像投影装置。 - 前記制御部が、往復走査を行う前記走査方向において、前記往路において前記レーザの出射を停止する時の前記走査角度よりも、前記復路において前記レーザの出射を開始する時の前記走査角度が、大きくなるように制御を行う
請求項4に記載の映像投影装置。 - レーザを射出するレーザ光源部と、
1つ以上の走査方向をもち、最も走査周波数が高い走査方向に関して前記レーザを往復走査して、映像を投影するレーザ走査部と、
前記レーザを出射する期間と前記レーザの出射を停止する期間とが交互に繰り返され、かつ、前記レーザの出射を連続して停止する期間が、眼のフォーカスがあう距離だけ離れた位置で前記眼の大きさに相当する範囲を前記レーザ走査部が前記最も走査周波数が高い走査方向に沿って走査するのに必要な角度に対応する時間よりも長くなるように、映像信号に応じて前記レーザ光源部及び前記レーザ走査部の動作を制御する制御部と
を備える映像投影装置。 - 前記制御部は、往路において前記レーザが出射される期間と復路において前記レーザが出射される期間が重ならないように制御を行う請求項7に記載の映像投影装置。
- レーザを射出するレーザ光源部と、
1つ以上の走査方向をもち、最も走査周波数が高い走査方向に関して前記レーザを往復走査して、映像を投影するレーザ走査部と、
前記レーザ光源部の出力が、前記レーザ走査部の走査角速度、または、被投射面における前記レーザの走査速度に比例するように、映像信号に応じて前記レーザ光源部及び前記レーザ走査部の動作を制御する制御部と
を備える映像投影装置。 - 前記制御部が、前記最も走査周波数が高い走査方向以外の走査方向の走査周期ごとに、時間で制御方法を切り替える
請求項1乃至9のいずれか1項に記載の映像投影装置。 - 前記制御部が、前記レーザの出射開始位置および出射停止位置を制御して、前記最も走査周波数が高い走査方向の走査周期ごとに、前記レーザの走査角度の範囲を変化させる
請求項1乃至10のいずれか1項に記載の映像投影装置。 - 前記レーザ走査部の走査範囲内に配置され、前記レーザの一部の光路を変化させる部分透過鏡と、
前記光路が変化したレーザを検知して前記制御部に通知する光検出器と
を更に有し、
前記制御部は、前記光路が変化したレーザを前記光検出器で検知したタイミングに基づいて、前記レーザの出射の開始および停止を制御する請求項1乃至11のいずれか1項に記載の映像投影装置。 - レーザを射出し、
1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して、前記レーザの往復走査を行って、映像を投影し、
往復走査を行う前記走査方向に関して、往路において前記レーザの出射を停止する時の走査角度と、復路において前記レーザの出射を開始する時の走査角度が異なるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御する映像投影方法。 - レーザを射出し、
1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して所定の走査周期で前記レーザを往復走査して、映像を投影し、
往復走査を行う前記走査方向に関して、往路における前記レーザの出射停止時間と、復路における前記レーザの出射開始時間との時間差が、前記レーザの隣接するパルスを単一のパルスとみなす前記パルス間の間隔の半分よりも長くなるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御し、
前記所定の走査周期を前記時間差×2÷(1-前記往復走査の折返し位置で前記レーザの隣接するパルスを単一のパルスとみなしたときに前記レーザの出力上限を低下させる割合R)よりも長くなるように設定する映像投影方法。 - レーザを射出し、
1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して前記レーザを往復走査して、映像を投影し、
前記レーザを出射する期間と前記レーザの出射を停止する期間とが交互に繰り返され、かつ、前記レーザの出射を連続して停止する期間が、眼のフォーカスがあう距離だけ離れた位置で前記眼の大きさに相当する範囲を前記最も走査周波数が高い走査方向に沿って走査するのに必要な角度に対応する時間よりも長くなるように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御する映像投影方法。 - レーザを射出し、
1つ以上の走査方向のうち、最も走査周波数が高い走査方向に関して前記レーザを往復走査して、映像を投影し、
前記レーザの出力が、前記レーザの走査角速度、または、被投射面における前記レーザの走査速度に比例するように、映像信号に応じて前記レーザの出射および前記レーザの走査を制御する映像投影方法。
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Also Published As
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CN102713723A (zh) | 2012-10-03 |
US20120327049A1 (en) | 2012-12-27 |
JPWO2011086849A1 (ja) | 2013-05-16 |
US9069171B2 (en) | 2015-06-30 |
JP5704074B2 (ja) | 2015-04-22 |
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