JP2008233562A - Optical scanning device, optical scanning image display device, and retinal scanning image display device - Google Patents

Abstract

An optical scanning device capable of maintaining the brightness of an image to be displayed correctly and correctly, and a retinal scanning image display device and a laser light scanning image display device having the same are provided.
A light emitting unit that emits light according to an image signal and an optical scanning unit that scans the light emitted from the light emitting unit are provided in a retinal scanning image display device or a laser light scanning image display device. And a light detection unit arranged at a position outside the effective scanning range of the scanning range by the light scanning unit, and at least around the light detection unit among the positions outside the effective scanning range. , Shielding means for shielding light outside the effective scanning range without shielding light to the light emitting portion, and control for adjusting timing and intensity of light emitted from the light emitting portion based on light detected by the light detecting portion Part.
[Selection] Figure 1

Description

  The present invention relates to an optical scanning device, an optical scanning image display device having the same, and a retinal scanning image display device.

  Conventionally, light generated based on an image signal is scanned and projected onto at least one retina of a user, and a retinal scanning image display device that displays an image or laser light on a projection surface that projects an image. An image display device such as an optical scanning image display device that scans and displays an image is known.

  The image display device includes an optical scanning device having a light emitting unit that emits light according to an image signal and an optical scanning unit that scans the light emitted from the light emitting unit.

  In this optical scanning device, the intensity of light emitted from the light emitting part changes due to heat generated when the light emitting part emits light, changes in the outside air temperature, etc. There is a possibility that the problem that the luminance cannot be maintained normally occurs.

As an optical scanning device that prevents the occurrence of such problems, a light detection unit that detects the intensity of light emitted by the light emission unit is provided in the light source unit of the light emission unit, and the light detected by the light detection unit is detected. There has been devised an optical scanning device that performs feedback control based on the intensity so as to keep the intensity of light emitted to the light emitting unit constant (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-88098

  However, in the above-described conventional optical scanning device, the light emitted from the light emitting unit is propagated to the optical scanning unit through a plurality of optical systems such as an optical fiber, a lens, and a mirror. Even if the light intensity is lost due to the coupling efficiency of the light and the reflectance of the mirror, and the intensity of the light emitted from the light emitting part can be accurately adjusted, the intensity of the light scanned by the light scanning part is kept constant. May not be able to be adjusted. As a result, in an image display device or the like, there is a possibility that the brightness of the image visually recognized by the user cannot be adjusted to the brightness desired by the user.

  Therefore, in the present invention according to claim 1, in the optical scanning device having a light emitting unit that emits light according to an image signal and an optical scanning unit that scans the light emitted from the light emitting unit, the light A light detection unit disposed at a position outside the effective scanning range of the scanning range by the scanning unit; and a light provided to at least the periphery of the light detection unit among the positions outside the effective scanning range, and to the light detection unit Has shielding means for shielding light outside the effective scanning range without shielding, and a control unit for adjusting the timing and intensity of light emitted from the light emitting unit based on light detected by the light detecting unit. It is characterized by that.

  According to a second aspect of the present invention, in the optical scanning device according to the first aspect, the light emitting section includes a plurality of light sources respectively corresponding to three primary colors, and at least one of the plurality of light sources. A single light source emits inspection light having a constant intensity at a predetermined timing outside the effective scanning period, and the control unit emits at least the inspection light based on the inspection light detected by the light detection unit. The intensity of light emitted from the light source is adjusted.

  According to a third aspect of the present invention, in the optical scanning device according to the second aspect, the light emitting unit emits the three primary colors of the inspection light from the plurality of light sources, and the control unit includes: Intensities of light emitted from the plurality of light sources are respectively adjusted based on the inspection light of the three primary colors detected by the light detection unit.

  According to a fourth aspect of the present invention, in the optical scanning device according to the second or third aspect, the control unit is configured to perform the inspection based on at least one color of inspection light among the three primary color inspection lights. The timing of the light emitted from the light emitting unit is adjusted.

  Also, in the present invention according to claim 5, in the optical scanning device according to claim 3, the light emitting section emits the inspection light of the three primary colors in an overlapping manner, and the control section transmits the light The timing of the light emitted from the light emitting unit is adjusted based on the superimposed inspection light emitted from the emitting unit.

  According to a sixth aspect of the present invention, in the optical scanning device according to any one of the second to fifth aspects, the light detection unit outputs a detection result signal corresponding to the intensity of the received inspection light. A photoelectric conversion element for outputting, the control unit adjusts the timing of light emitted from the light emitting unit based on a change timing of the detection result signal, and the light source based on the intensity of the detection result signal The intensity of light emitted from the light source is adjusted.

  According to a seventh aspect of the present invention, in the optical scanning device according to any one of the first to sixth aspects, the optical scanning unit emits light at a relatively high speed in the first scanning direction. A high-speed scanning unit that scans; and a low-speed scanning unit that scans light at a low speed relative to a second scanning direction that is a direction intersecting or orthogonal to the first scanning direction, and the control unit Is characterized in that inspection light to be detected by the light detection unit is emitted from each light source at different timings, and the inspection light is scanned one line in the first scanning direction outside the effective scanning range. It is characterized by.

  According to an eighth aspect of the present invention, in the optical scanning device according to any one of the first to sixth aspects, the optical scanning unit emits light at a relatively high speed in the first scanning direction. A high-speed scanning unit that scans; and a low-speed scanning unit that scans light at a low speed relative to a second scanning direction that is a direction intersecting or orthogonal to the first scanning direction, and the control unit Is characterized in that the inspection light is emitted from the light emitting section so that the inspection light is continuously scanned in a plurality of lines in the first scanning direction outside the effective scanning range.

  According to a ninth aspect of the present invention, the optical scanning device according to any one of the first to eighth aspects is provided, and the light modulated according to the image signal is scanned by the optical scanning device, thereby projecting. An optical scanning image display device that projects and displays an image on a surface is provided.

  According to a tenth aspect of the present invention, there is provided the optical scanning type image display device according to the ninth aspect, wherein the optical scanning device scans light modulated in accordance with an image signal, whereby at least one of the users is scanned. The present invention provides a retinal scanning image display device that projects an image on the retina and displays the image.

  According to the first aspect of the present invention, in an optical scanning device including a light emitting unit that emits light according to an image signal and an optical scanning unit that scans light emitted from the light emitting unit, scanning by the optical scanning unit A light detection unit arranged at a position outside the effective scanning range in the range, and at least a position outside the effective scanning range around the light detection unit, and effective scanning without shielding light to the light detection unit Since it has shielding means for shielding light outside the range, and a control unit for adjusting the timing and intensity of light emitted from the light emitting unit based on the light detected by the light detecting unit, optical scanning The intensity of the light scanned by the unit can be adjusted to be constant. As a result, in the image display device or the like, the brightness of the image visually recognized by the user can be adjusted to the brightness desired by the user.

  According to a second aspect of the present invention, in the optical scanning device according to the first aspect, the light emitting section includes a plurality of light sources respectively corresponding to the three primary colors, and at least one of the plurality of light sources. Light having a constant intensity emitted from the light source is emitted at a predetermined timing outside the effective scanning period, and the control unit emits at least light from the light source that has emitted the inspection light based on the inspection light detected by the light detection unit. Since it is not necessary to emit light from all light sources in order to detect and adjust the light intensity, the power consumption of the optical scanning device is reduced as much as possible. be able to.

  According to a third aspect of the present invention, in the optical scanning device according to the second aspect, the light emitting unit emits three primary colors of inspection light from a plurality of light sources, and the control unit is a light detecting unit. Since the intensity of light emitted from a plurality of light sources is adjusted based on the detected three primary color inspection lights, the intensity of the emitted light is individually adjusted for all light sources. Therefore, the accuracy of light intensity adjustment can be further improved and white balance can be adjusted.

  According to a fourth aspect of the present invention, in the optical scanning device according to the second or third aspect, the control unit is a light emitting unit based on at least one color of the inspection light of the three primary colors. For example, if a single-color inspection light that is highly sensitive to the light detection unit is used as the inspection light, the consumption required for adjusting the light emission timing is used. It is possible to obtain an optical scanning device that can reduce the power and can adjust the light emission timing suitably while having low power consumption.

  Further, in the present invention according to claim 5, in the optical scanning device according to claim 3, the light emitting unit emits the inspection light of the three primary colors superimposed, and the control unit emits from the light emitting unit. Since the timing of the light emitted from the light emitting portion is adjusted based on the superimposed inspection light, the occurrence of chromatic aberration can be prevented.

  Moreover, in this invention which concerns on Claim 6, in the optical scanning device of any one of Claims 2-5, a light detection part outputs the detection result signal according to the intensity | strength of the received test | inspection light. The control unit has a photoelectric conversion element, adjusts the timing of the light emitted from the light emitting unit based on the change timing of the detection result signal, and determines the intensity of the light emitted from the light source based on the intensity of the detection result signal. Since it is characterized by adjustment, an optical scanning device that can adjust both the light emission timing and the light intensity can be obtained with a relatively simple structure.

  According to a seventh aspect of the present invention, in the optical scanning device according to any one of the first to sixth aspects, the optical scanning unit scans light at a relatively high speed in the first scanning direction. A high-speed scanning unit, and a low-speed scanning unit that scans light at a low speed relative to a second scanning direction that is a direction intersecting or orthogonal to the first scanning direction, and the control unit includes: The inspection light to be detected by the light detection unit is emitted from each light source at different timings, and each inspection light is scanned one line in the first scanning direction outside the effective scanning range. Therefore, it is not necessary to provide a light detection unit for each of the three primary colors, and each of the three primary colors can be detected individually by a single light detection unit, thereby further reducing the size of the optical scanning device. it can.

  According to an eighth aspect of the present invention, in the optical scanning device according to any one of the first to sixth aspects, the optical scanning unit scans light at a relatively high speed in the first scanning direction. A high-speed scanning unit, and a low-speed scanning unit that scans light at a low speed relative to a second scanning direction that is a direction intersecting or orthogonal to the first scanning direction, and the control unit includes: The inspection light is emitted from the light emitting part so that the inspection light is continuously scanned in the first scanning direction outside the effective scanning range. Since the light intensity emitted by the light emitting unit and the light emission timing can be adjusted using a plurality of detection results obtained by detecting the light for use by the light detecting unit, for example, the average of the detection results obtained a plurality of times is obtained. Using the result, the intensity of the light emitted by the light emitting part and the light intensity By adjusting the timing morphism, the adjustment accuracy can be further improved.

According to a ninth aspect of the present invention, the optical scanning device according to any one of the first to eighth aspects is provided, and the light modulated in accordance with the image signal is scanned by the optical scanning device, so that the light is projected onto the projection surface. Since the optical scanning type image display device for projecting and displaying an image is provided, the intensity of light scanned by the optical scanning unit can be adjusted to be constant, and the luminance of the displayed image can be kept normal. In addition, since it is not necessary to provide a light source separately from the light emitting unit in order to detect and control the light emission timing, it is possible to provide an optical scanning image display device that can be miniaturized.

  According to a tenth aspect of the present invention, the optical scanning image display device according to the ninth aspect is provided, and the optical scanning device scans the light modulated in accordance with the image signal, so that at least one retina of the user is obtained. The retinal scanning image display device that projects the image onto the screen and displays the image can be adjusted so that the intensity of the light scanned by the light scanning unit can be kept constant, and the brightness of the image to be displayed Provides a retinal scanning image display device that can be miniaturized because it is not necessary to provide a light source separately from the light emitting unit in order to detect and control the light emission timing. can do.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the optical scanning device of the present invention is provided, and the optical scanning device scans the light modulated according to the image signal, thereby projecting an image on at least one retina of the user and displaying the image. The retinal scanning image display device will be described as an example, but the present invention is not limited to this. For example, the optical scanning device of the present invention is provided, and the laser beam modulated according to the image signal is It can be applied to other image display devices that display an image by scanning light, such as an optical scanning image display device that projects and displays an image on a projection surface by scanning with an optical scanning device. is there.

  FIG. 1 is an explanatory diagram illustrating an optical scanning device according to the present embodiment, FIG. 2 is an explanatory diagram illustrating a video signal supply circuit according to the present embodiment, and FIG. 3 is an arrangement of light detection units according to the present embodiment. FIG. 4 is an explanatory diagram showing a waveform of a detection result signal output from the light detection unit of the present embodiment, and FIGS. 5 and 7 are included in the optical scanning device of the embodiment. FIG. 6, FIG. 8, and FIG. 9 are explanatory diagrams illustrating scanning modes of inspection light in the optical scanning device of the present embodiment.

[Electrical configuration of optical scanning device]
The electrical configuration of the optical scanning device included in the retinal scanning image display device of this embodiment will be described with reference to FIG.

  As shown in FIG. 1, the optical scanning device 1 included in the retinal scanning image display device of the present embodiment includes a light source unit that functions as a light emitting unit that emits light modulated according to an image signal input from the outside. 2 and a control unit 110 that controls the operation of the light source unit 2.

  The light source unit 2 includes a video signal supply circuit 3 that generates signals serving as elements for synthesizing video based on image signals input from the outside. By operating according to various instructions input from the control unit 110 to be described in detail, the timing and intensity of the emitted light are adjusted.

  The light source unit 2 emits a red laser beam, an R laser beam 13 that emits a green laser beam, and a blue laser beam as a plurality of light sources respectively corresponding to the three primary colors. And a red (R), green (G), and blue (B) video signal 4 (4r, 4g, 4b) transmitted as a video signal 4 from the video signal supply circuit 3. In addition, an R laser driver 10, a G laser driver 9, and a B laser driver 8 are provided for driving the R laser 13, the G laser 12, and the B laser 11, respectively, so as to emit intensity-modulated laser beams. ing.

  Further, the light source unit 2 includes a collimating optical system 14 that collimates the laser light emitted from each laser into parallel light, a dichroic mirror 15 that combines the collimated laser light, and the combined laser light. And a coupling optical system 16 leading to the fiber 17. As the R laser 13, G laser 12, and B laser 11, a semiconductor laser such as a laser diode or a solid-state laser may be used.

  In addition, the optical scanning device 1 of the present embodiment includes an optical scanning unit that scans the laser light emitted from the light source unit 2 that is a light emitting unit, and the optical scanning unit is configured as shown in FIG. The collimating optical system 18 that guides the laser light propagated from the light source unit 2 to the horizontal scanning system 19, and the horizontal scanning system that scans the laser light collimated by the collimating optical system 18 in the horizontal direction using the galvanometer mirror 19a. 19, a first relay optical system 20 that guides the laser beam scanned by the horizontal scanning system 19 to the vertical scanning system 21, and a laser beam that is scanned by the horizontal scanning system 19 and incident through the first relay optical system 20. A vertical scanning system 21 that scans in the vertical direction using the galvano mirror 21a, and a second relay optical system 22 that guides the laser light scanned by the vertical scanning system 21 to the pupil 24 of the user. There.

  In this optical scanning unit, the horizontal scanning system 19 is a high-speed scanning unit that horizontally scans a laser beam at a high speed relative to the horizontal direction, which is the first scanning direction, for each scanning line of an image to be displayed. And a galvano mirror 19a that scans the laser beam in the horizontal direction, and a horizontal scanning control circuit 19c that controls driving of the galvano mirror 19a.

  In this optical scanning unit, the vertical scanning system 21 scans the laser beam in a second direction which is a direction intersecting or orthogonal to the first scanning direction, and one frame of an image to be displayed. Each time, the laser beam functions as a low-speed scanning unit that performs vertical scanning at a low speed relative to the vertical direction, which is the second scanning direction, from the first scanning line toward the last scanning line. A mirror 21a and a vertical scanning control circuit 21c that controls driving of the galvanometer mirror 21a are provided.

  As described above, the horizontal scanning system 19 is designed to scan the laser beam at a higher speed, that is, at a higher frequency than the vertical scanning system 21. Further, as shown in FIG. 1, the horizontal scanning system 19 and the vertical scanning system 21 are respectively connected to the video signal supply circuit 3 and are respectively supplied to the horizontal synchronization signal 5 and the vertical synchronization signal 6 output from the video signal supply circuit 3. The laser beam is scanned in synchronization.

  In the retinal scanning image display apparatus according to the present embodiment, laser light is emitted in the first scanning direction and the first scanning direction by the horizontal scanning system 19 and the vertical scanning system 21 included in the optical scanning unit of the optical scanning apparatus 1. By scanning in the second scanning direction substantially perpendicular to the scanning direction, scanning is performed in a two-dimensional direction to form an image in units of frames.

  In the present embodiment, the galvanometer mirror 19a of the horizontal scanning system 19 and the galvanometer mirror 21a of the vertical scanning system 21 have been described with the same names, but their reflecting surfaces are oscillated so as to scan light. Needless to say, any driving method such as piezoelectric driving, electromagnetic driving, electrostatic driving, or the like may be used as long as it can be moved (rotated). In this embodiment, the horizontal scanning system 19 is a resonance type scanning system and the vertical scanning system 21 is a non-resonant type scanning system. However, the present invention is not limited to this. For example, the horizontal scanning system 19 is a non-resonant type. The scanning system may be used.

  In particular, the optical scanning device 1 of the present embodiment is disposed at a position outside the effective scanning range described later in the scanning range of laser light by the vertical scanning system 21 and the horizontal scanning system 19 provided in the optical scanning unit, and the light source A BD (Beam Detector) sensor 31 serving as a light detection unit that detects inspection light described below that is emitted from the unit unit 2 and is scanned outside the effective scanning range is provided. In FIG. 1, the BD sensor 31 is configured to be provided above the effective scanning range of the laser beam. However, the arrangement position of the BD sensor 31 is not limited to this. You may comprise so that it may provide below a scanning range, and it may provide both above and below.

  The optical scanning device 1 is provided at least around the BD sensor 31 outside the effective scanning range of the laser light, does not block the laser light to the BD sensor 31, and emits laser light outside the effective scanning range. A light shielding mask 31a that functions as a shielding means for shielding is provided. In the case where the BD sensor has a peripheral part other than the part that actually detects light to a certain extent or more, the peripheral part is configured as a shielding means without providing a separate light shielding mask 31a. May be.

  In the optical scanning device 1, the control unit 110 (see FIG. 2), which will be described later, emits the laser beam emitted from the light source unit 2 based on the inspection light detected by the BD sensor 31 and the laser. The light intensity is adjusted.

  The BD sensor 31 includes a photoelectric conversion element that outputs a current corresponding to the intensity of the received inspection light to the video signal supply circuit 3 as a detection result signal (hereinafter referred to as “BD signal 7”). Between the vertical scanning system 21 and the pupil 24 of the user, it is arranged outside the effective scanning range by the optical scanning unit.

  In the present embodiment, the BD sensor 31 is arranged between the vertical scanning system 21 and the second relay optical system 22 outside the effective scanning range of the laser beam by the vertical scanning system 21, as shown in FIG. However, the arrangement position of the BD sensor 31 is not limited to this, and is arbitrary as long as it is outside the effective scanning range in the scanning range of the laser light between the optical scanning unit and the pupil 24 of the user. For example, you may arrange | position outside the effective scanning range among the scanning ranges of the laser beam between the 2nd relay optical system 22 and a user's pupil 24, for example.

  In general, a range in which an image is displayed or formed by scanning is referred to as an effective scanning range, and a period in which an image signal representing the image is output is referred to as an effective scanning period. In this embodiment, the effective scanning range is Of the scanning range in which the optical scanning unit can scan the laser beam, the scanned laser beam is also a scanning range projected onto the user's retina. Therefore, the laser beam is visible to the user outside the effective scanning range. Generally, it is configured not to be performed. Specifically, the laser beam is not emitted outside the effective scanning range or is shielded from being visually recognized by the user.

  In the present embodiment, the effective scanning range is defined as a scanning range in which the scanned laser light is projected onto the user's retina out of the scanning range in which the optical scanning unit scans the laser light as described above. However, the definition of the effective scanning range is not limited to this, and any scanning range is effective as long as the user can visually recognize the scanned laser light in the range in which the optical scanning unit scans the laser light. For example, a light-shielding body having a predetermined area through which only laser light for image display passes is disposed between the vertical scanning system 21 and the pupil 24 of the user, and this light shielding is performed. A body opening may be defined as the effective scanning area.

  Further, when detecting the scanned scanning light, the BD sensor 31 outputs a current corresponding to the detected intensity of the scanning light as the BD signal 7 to the control unit 110. Here, the BD sensor 31 is configured to output a current corresponding to the intensity of the received light as the BD signal 7. However, the BD signal 7 is not limited to this, and for example, the BD sensor 31. A signal whose voltage value changes according to the intensity of the received light may be output as the BD signal 7.

  The control unit 110 performs control to calculate and adjust the scanning period such as the emission timing of the laser light emitted from the light source unit 2 and the resonance frequency based on the change timing of the BD signal 7, and the BD signal 7. Based on the current amplitude value, the intensity of the laser beam emitted from the light source unit 2 is calculated and adjusted. The laser beam emission timing is an important timing used to determine an effective scanning region, an image display start timing in units of frames, and the like. In addition, the current amplitude value in this embodiment is used to indicate the intensity (magnitude) of the detection signal when light is detected, and the maximum value is used in a portion exceeding a predetermined threshold. It may be an average value.

  As described above, in the optical scanning device 1 of the present embodiment, the inspection light is detected by the BD sensor 31 provided in the subsequent stage of the optical scanning unit in the propagation path of the laser light emitted from the light source unit unit 2. Since the detection result is used to adjust the intensity of the laser beam and the emission timing of the laser beam, the intensity of the light scanned by the optical scanning unit can be adjusted to be constant, and the emission of the inspection light can be maintained. Since it is not necessary to provide a light source separately from the light emitting unit in order to detect timing, the optical scanning device 1 can be downsized.

  Next, FIG. 1 shows a process from when the optical scanning device 1 included in the retinal scanning image display device according to the embodiment of the present invention receives an image signal from the outside until it projects an image on the retina of the user. It explains using.

  As shown in FIG. 1, in the optical scanning device 1 according to the present embodiment, when the video signal supply circuit 3 provided in the light source unit 2 receives an external image signal, the video signal supply circuit 3 , Green video signal 4r composed of R video signal 4r, G video signal 4g, and B video signal 4b for outputting laser beams of green and blue, horizontal synchronizing signal 5 and vertical synchronizing signal 6 are output. The R laser driver 10, the G laser driver 9, and the B laser driver 8 are respectively applied to the R laser 13, the G laser 12, and the B laser 11 based on the input R video signal 4r, G video signal 4g, and B video signal 4b. The respective drive signals (not shown) are output. Based on this drive signal, the R laser 13, the G laser 12, and the B laser 11 generate intensity-modulated laser beams, respectively, and output them to the collimating optical system 14.

  In particular, in the present embodiment, the light source unit 2 is a laser beam for displaying an image from a plurality of light sources such as a R laser 13, a G laser 12, and a B laser 11 corresponding to three primary colors. Separately, inspection light having a constant intensity for detection by the BD sensor 31 is emitted.

  That is, the light source unit 2 emits laser light corresponding to the image signal during the period in which the optical scanning unit scans the laser light in the above-described effective scanning range in the scanning range of the laser light, and the effective scanning period. Inspection light is emitted outside at a predetermined timing.

  The control unit 110 of the optical scanning device 1 displays a laser beam for displaying an image emitted from the R laser 13, the G laser 12, and the B laser 11 based on the three primary color inspection lights detected by the BD sensor 31. Control to adjust the light intensity is performed.

  That is, when the BD signal 7 is input from the BD sensor 31, the control unit 110 and the current amplitude value of the BD signal 7 and a predetermined current value (hereinafter referred to as “set current value”) set in advance. Are output from the video signal supply circuit 3 to the respective lasers by outputting a signal indicating an RGB intensity instruction feedback-controlled so that the current value of the BD signal 7 is equal to the set current value. Each laser beam for displaying the image emitted from the R laser 13, the G laser 12, and the B laser 11 by outputting the video signal 4 to the drivers (B laser driver 8, G laser driver 9, R laser driver 10), respectively. Adjust the strength of each.

  As described above, in this embodiment, the control unit 110 individually adjusts the intensity of the laser light emitted from each of the R laser 13, the G laser 12, and the B laser 11 based on the inspection light detected by the BD sensor 31. Therefore, the accuracy of laser beam intensity adjustment can be further improved.

  Here, the configuration is such that the intensity of the laser light emitted from all the light sources is adjusted based on the inspection light. For example, among the three primary color laser lights, the BD sensor is used as the inspection light. It may be configured to perform control for adjusting the intensity of laser light emitted from at least one light source that has emitted the inspection light, using the inspection light of one color having the highest light receiving sensitivity 31.

  With this configuration, it is not necessary to emit laser light from all the light sources in order to emit inspection light, and thus an increase in power consumption of the optical scanning device 1 can be suppressed.

  In the present embodiment, the inspection light corresponding to the three primary colors is emitted from each of the R laser 13, the G laser 12, and the B laser 11, but the R laser 13, the G laser 12, and the B laser 11 Inspection light for causing the BD sensor 31 to detect from at least one of the light sources is emitted and detected by the BD sensor 31, and the R signal 13 and the G laser are supplied to the video signal supply circuit 3 based on the detection result. 12, all of the B laser 11 may be configured to adjust the intensity of the laser beam output.

  Also with this configuration, the power consumption required to adjust the intensity of the emitted laser light can be reduced as much as possible.

  In addition, the control unit 110 of the present embodiment displays an image emitted from the R laser 13, the G laser 12, and the B laser 11 of the light source unit unit 2 based on the inspection light of one color among the three primary color inspection lights. For adjusting the emission timing of the laser beam for the purpose.

  That is, when the BD signal 7 is input from the BD sensor 31, the control unit 110 outputs an image emitted from the R laser 13, the G laser 12, and the B laser 11 based on the change timing of the current amplitude value in the BD signal 7. By outputting to the video signal supply circuit 3 a signal indicating an instruction of the laser beam emission timing that is feedback-controlled so that the emission start timing of each laser beam for displaying the image becomes a predetermined timing, the video signal supply circuit 3 By generating a video signal 4 and outputting the video signal 4 to each laser driver (B laser driver 8, G laser driver 9, and R laser driver 10), respectively, thereby causing the R laser 13, the G laser 12, and the B laser 11 to be output. The emission start timing of each laser beam for displaying an image emitted from is adjusted.

  As described above, in the optical scanning device 1 according to the present embodiment, the R laser 13, the G laser 12, and the B laser 11 that emit laser light for displaying an image are used as light sources for inspection light. The emitted inspection light of at least one color is detected by the BD sensor 31, and the emission timing of the laser light emitted from the R laser 13, the G laser 12, and the B laser 11 is determined based on the change timing of the BD signal 7 obtained as a result. Since it is configured to adjust, it is not necessary to provide a new light source in order to detect and adjust the emission timing of the laser beam, and the optical scanning device 1 can be reduced in size and has a relatively simple structure. However, an optical scanning device capable of adjusting both the laser beam emission timing and the laser beam intensity can be provided.

  Further, in the optical scanning device 1 of the present embodiment, when detecting and adjusting the emission timing of laser light, it is not necessary to use all of the three primary colors of inspection light, and one of the three primary colors of inspection light is used. Since it is possible to detect and adjust the timing of the laser beam emitted from the light source unit 2 based on the inspection light, it is possible to save power and to detect and adjust the emission timing of the laser beam. In addition, the processing burden on the video signal supply circuit 3 can be reduced as much as possible.

  Further, it is not necessary to emit inspection light from all the light sources of the R laser 13, G laser 12, and B laser 11, and detection of the laser light emission timing is performed by emitting inspection light from any one of the light sources. In addition, the power consumption of the optical scanning device 1 can be reduced as much as possible.

  Further, the control unit 110 of the optical scanning device 1 causes the light source unit unit 2 to generate laser light in response to a BD synchronization timing signal (not shown) indicating a driving state of a galvano mirror 19a of the horizontal scanning system 19 described later. Thus, the timing of emitting each beam to the collimating optical system 14 is controlled. That is, the control unit 110 of such an optical scanning device 1 controls the timing at which the galvano mirror 19a and the like emit laser light. The laser light generated from the point light source is collimated into parallel light by the collimating optical system 14, and is further incident on the dichroic mirror 15 to be combined into one laser light, and then combined by the coupling optical system 16. It is guided to enter the optical fiber 17.

  The laser light propagated through the optical fiber 17 is collimated into parallel light from the optical fiber 17 by the collimating optical system 18 and is emitted to the horizontal scanning system 19. The emitted laser light is incident on the deflection surface 19b of the galvanometer mirror 19a of the horizontal scanning system 19. The laser light incident on the deflection surface 19b of the galvanometer mirror 19a is scanned in the horizontal direction in synchronization with the horizontal synchronization signal and enters the deflection surface 21b of the galvanometer mirror 21a of the vertical scanning system 21 via the first relay optical system 20. . The galvanometer mirror 21a is reciprocally oscillated so that the deflection surface 21b reflects incident light in the vertical direction in synchronization with the vertical synchronization signal 6 in the same manner as the galvanometer mirror 19a synchronizes with the horizontal synchronization signal. Laser light is scanned in the vertical direction by the galvanometer mirror 21a. The laser beam scanned by the galvanometer mirror 21 a enters the user's pupil 24 via the second relay optical system 22. Thus, the user can recognize the image by the laser light that is two-dimensionally scanned and projected onto the retina in this way.

[Electrical configuration of control unit]
Here, the electrical configuration of the control unit 110 included in the optical scanning device 1 described above will be described with reference to FIG.

  As shown in FIG. 2, the control unit 110 includes a CPU (Central Processing Unit) 102 and a first storage unit 103 that functions as a main storage device that stores (stores) various programs executed by the CPU 102 and various types. An input / output interface for transmitting and receiving various signals between a ROM 107 having a second storage unit 104 for storing data and the like, a RAM 106 functioning as a work area when the CPU 102 executes various programs, and an external circuit 105. The CPU 102, RAM 106, ROM 107, and input / output interface 105 are electrically connected via a system bus 101.

(Regarding the first storage unit 103)
The first storage unit 103 includes an operating system (OS) program for providing basic functions as a computer, a program for receiving an image signal from the outside, a conversion program for converting an image signal from the outside, An output program for outputting the converted image signal, a program for receiving the BD signal 7 from the inside, a program for adjusting the intensity of the laser beam emitted from the light source unit 2 and the emission timing of the laser beam based on the BD signal 7, horizontal Programs for controlling the scanning system 19 and the vertical scanning system 21 are stored. These are read by the CPU 102, and the functions according to these programs are executed by the CPU 102.

(About the second storage unit 104)
In the second storage unit 104, information indicating a plurality of types of set current values used for adjusting the intensity of the three primary colors of laser light emitted from the B laser 11, the G laser 12, and the R laser 13 of the light source unit unit 2 In addition, information indicating a light reception timing detection current value, which will be described later, used for feedback control of the laser light emission timing, information indicating a predicted light reception timing, and the like are stored. The set current value is configured so that the user can arbitrarily change the setting according to the desired brightness of the display image.

(I / O interface 105)
The input / output interface 105 has a function of controlling transmission / reception in the optical scanning device 1. Specifically, the input / output interface 105 receives the BD signal 7 from the BD sensor 31, receives the horizontal synchronization signal 5, the vertical synchronization signal 6, various signals from the inside, and the like, and inputs to the video signal supply circuit 3. A signal indicating an RGB intensity instruction, a signal indicating a laser light emission timing, a signal indicating an inspection light emission instruction, a system clock, an internal video signal, various control signals, and the like are output.

  The control unit 110 configured as described above reads out and executes the various programs stored in the first storage unit 103 by the CPU 102 as described above, so that the entire retinal scanning image display device including the optical scanning device 1 is executed. In particular, in this embodiment, the intensity of the laser beam emitted from the light source unit 2 and the emission timing of the laser beam are automatically determined based on the BD signal 7 input from the BD sensor 31. adjust.

[Disposition position of BD sensor and shading mask]
Here, the arrangement positions of the BD sensor 31 and the light shielding mask 31a will be described with reference to FIG.

  As shown in FIG. 3A, in the present embodiment, the BD sensor 31 is disposed at a position between the vertical scanning system 21 and the second relay optical system 22.

  As described above, in the present embodiment, since the BD sensor 31 is provided in the stage subsequent to the optical scanning unit in the propagation path of the laser light, it is possible to detect a change in the intensity of the laser light immediately before entering the pupil 24 of the user. Thereby, the intensity of the laser beam emitted from the light source unit 2 can be accurately adjusted so as to be the intensity desired by the user.

  That is, in the present embodiment, the BD sensor 31 is not provided inside the light source unit as in the conventional optical scanning device, but the inspection light (laser light) immediately before entering the user's pupil 24 can be detected. Since it is provided between the vertical scanning system 21 and the second relay optical system 22, the laser beams emitted from the B laser 11, the G laser 12, and the R laser 13, which are light sources, are arranged in the propagation path. A plurality of optical systems such as a collimating optical system 14, a dichroic mirror 15, a coupling optical system 16, an optical fiber 17, a collimating optical system 18, a horizontal scanning system 19, a first relay optical system 20, and a vertical scanning system 21. Even if intensity is lost due to this, the intensity of the laser light emitted from the light source unit 2 is accurately adjusted in consideration of the loss so as to be the intensity desired by the user. It is possible to be.

  In the present embodiment, the BD sensor 31 is arranged outside the effective scanning range Za in the scanning range Z of the laser beam by the vertical scanning system 21.

  Further, as shown in FIG. 3A, the light shielding mask 31a is provided at least around the BD sensor 31 in a position outside the effective scanning range Za, and the laser beam to the BD sensor 31 is shielded. Without being configured, the laser beam outside the effective scanning range Za is shielded.

  As described above, in this embodiment, the BD sensor 31 is provided outside the effective scanning range Za of the laser beam by the optical scanning unit, and the light shielding mask 31a is provided around the BD sensor 31. Is not guided to the pupil 24 of the user, and the emission of the inspection light does not hinder the image display.

  That is, the optical scanning device 1 of this embodiment uses the horizontal scanning system 19 to reciprocate a laser beam emitted from the light source unit 2 at a relatively high speed in the horizontal direction (X-axis direction) a plurality of times. At the same time, the reciprocated laser beam is scanned at a relatively low speed in the vertical direction (Y-axis direction), which is the second scanning direction, by the vertical scanning system 21, thereby displaying an image of one frame.

  At this time, the vertical scanning system 21 scans the laser beam in a preset scanning range Z as shown in FIG. 3A shows only the scanning range Z of the laser beam in the vertical direction and the effective scanning range Za by the vertical scanning system 21, but the scanning of the laser beam in the horizontal direction by the horizontal scanning system 19 is shown. Similarly, the scanning range and the effective scanning range are set.

  At this time, the light scanning unit zigzags the scanning range Z indicated by the two-dot chain line in FIG. 3B from the top to the bottom, and the light scanning unit has the BD sensor 31 as the light scanning unit. The inspection light is emitted during the period during which the area where the light is disposed is scanned, and the laser light for displaying the image is emitted during the period during which the optical scanning unit scans the area within the effective scanning range Za. However, in the present embodiment, as shown in FIG. 3A, the BD sensor 31 shields the portion other than the portion that receives the inspection light with the light shielding mask 31a in the region where the inspection light is scanned. The emission of the inspection light is prevented from obstructing the image display.

  In the present embodiment, as shown in FIG. 3B, the BD sensor 31 is disposed above the effective scanning range Za and approximately at the center of the upper end of the scanning range Z.

  Thus, by providing the BD sensor 31 above the effective scanning range Za, the inspection light can be detected by the BD sensor 31 before the laser beam is scanned in the effective scanning range Za. The intensity of the laser light emitted from the light source unit 2 can be adjusted before scanning the scanning range Za, and an image can be displayed with the laser light whose intensity has already been adjusted.

  Further, by providing the BD sensor 31 at the center position where the scanning speed by the horizontal scanning system 19 is the fastest at the upper end of the scanning range Z, the control unit 110 allows the inspection light being scanned at the fastest scanning speed. Since the emission timing of the laser beam emitted from the light source unit 2 can be adjusted using the detection timing, the accuracy of adjusting the emission timing of the laser beam can be improved.

[Method of adjusting laser light intensity and emission timing]
When the BD sensor 31 arranged as described above detects the inspection light, the BD signal 7 whose current amplitude value changes according to the intensity of the received inspection light is sent to the control unit 110 as shown in FIG. Based on this BD signal 7, the controller 110 adjusts the intensity and emission timing of the laser beam emitted from the light source unit 2 as follows.

  When the BD signal 7 is input from the BD sensor 31, the control unit 110, as shown in FIG. 4A, the peak of the current amplitude value of the received BD signal 7 becomes equal to the preset set current value. The light source unit is adjusted by adjusting the rising timing of the BD signal 7 to be equal to the preset predicted light receiving timings T1 and T2 based on the change timing of the current amplitude value of the BD signal 7. The intensity of the laser beam emitted to the unit 2 and the emission timing are adjusted.

  That is, the control unit 110 receives a BD signal 7 indicating a current amplitude value lower than a preset current value preset in the second storage unit 104, like a BD signal 7 shown on the left side of FIG. Then, it is determined that the intensity of the laser beam emitted from the light source unit 2 is too low, and an image signal for increasing the intensity of each laser beam emitted from the B laser 11, the G laser 12, and the R laser 13 is supplied to the image signal supply circuit. The intensity of the laser beam emitted from the light source unit 2 is increased by causing the laser beam to be generated by the light source unit unit 2 and input to the B laser driver 8, the G laser driver 9, and the R laser driver 10.

  On the other hand, the control unit 110, like the BD signal 7 shown on the right side of FIG. 4B, shows a BD signal indicating a current amplitude value higher than the set current value preset in the second storage unit 104. 7 is input, it is determined that the intensity of the laser beam emitted to the light source unit 2 is too high, and a video signal for reducing the intensity of each laser beam emitted from the B laser 11, the G laser 12, and the R laser 13 is output. The intensity of the laser light emitted from the light source unit 2 is reduced by causing the video signal supply circuit 3 to generate the signal and input it to each of the B laser driver 8, the G laser driver 9, and the R laser driver 10.

  In this way, the control unit 110 outputs an instruction to the video signal supply circuit 3 to adjust each video signal input to the B laser driver 8, the G laser driver 9, and the R laser driver 10 to the video signal supply circuit 3. Feedback control is performed so that the relationship between the current amplitude value of the BD signal 7 inputted from the BD sensor 31 and the set current value becomes the relationship shown in FIG. 4A, and the intensity of the laser light emitted from the light source unit 2 Is adjusted.

  4A, the current amplitude value of the BD signal 7 input from the BD sensor 31 is set in the second storage unit 104 in advance, as shown in FIG. 4A. If it detects that it became the above, it will be judged that the BD sensor 31 detected the test light.

  Then, the control unit 110 receives the BD signal 7 that rises at a timing later than the predicted light reception timing T1 preset in the second storage unit 104, like the BD signal 7 shown on the left side of FIG. Then, it is determined that the emission timing of the laser beam to be emitted to the light source unit 2 is too late, and the input timing of the video signal input to the B laser 11, G laser 12, and R laser 13 to the video signal supply circuit 3. By transmitting an instruction to speed up the laser beam, the emission timing of the laser beam emitted from the light source unit 2 is advanced.

  On the other hand, the control unit 110 receives a BD signal that rises at a timing earlier than the predicted light reception timing T2 preset in the second storage unit 104, like a BD signal 7 shown on the right side of FIG. Then, it is determined that the emission timing of the laser beam emitted from the light source unit 2 is too early, and the video signal input to the B laser 11, G laser 12, and R laser 13 is input to the video signal supply circuit 3. By transmitting an instruction to delay the input timing, the emission timing of the laser light emitted from the light source unit 2 is delayed.

  Thus, the control unit 110 adjusts the input timing of the video signal input to the B laser driver 8, the G laser driver 9, and the R laser driver 10, and the rising timing of the BD signal 7 input from the BD sensor 31 and the predicted light reception timing T1, The emission timing of the laser beam emitted from the light source unit 2 is adjusted by performing feedback control so that the relationship with T2 becomes the relationship shown in FIG.

  As described above, in the optical scanning device 1 of the present embodiment, the light source that emits the laser light for displaying an image is used as the light source for the inspection light, and thus the size of the device can be reduced.

[Description of Processing of Optical Scanning Device]
Here, the processing performed by the control unit 110 of the optical scanning device 1 included in the retinal scanning image display device of the present embodiment will be specifically described.

(Main process)
When the power is turned on, the control unit 110 of the optical scanning device 1 according to the present embodiment executes main processing according to the flowchart shown in FIG. 5 until the power is turned off.

  In this main process, when the power is turned on, the control unit 110 first determines whether or not the image display condition is satisfied (step S1), and determines that the image display condition is satisfied. (Step S1: YES), the process proceeds to Step S2, and if it is determined that the image display condition is not satisfied (Step S1: NO), the process proceeds to Step S5.

  In step S1, when the control unit 110 detects that a reproduction button (not shown) of the retinal scanning image display apparatus is operated by the user, the control unit 110 sets a flag indicating that data reproduction is in progress in the second storage unit 104. With reference to the flag, it is determined that the image display condition is satisfied when the flag is set, and it is determined that the image display condition is not satisfied when the flag is not set. This flag is cleared when a stop button (not shown) is operated by the user.

  Next, in step S2, the control unit 110 executes the emission intensity / emission timing adjustment process, and after adjusting the intensity of the laser beam for displaying the image emitted from the light source unit 2 and the emission timing, The process proceeds to step S3. The emission intensity / emission timing adjustment process will be described in detail later with reference to FIG.

  Next, in step S3, the control unit 110 executes image display processing to cause the video signal supply circuit 3 to generate a video signal based on an image signal input from the outside to the video signal supply circuit 3, and to perform predetermined processing. Are output to the R laser driver 10, the G laser driver 9, and the B laser driver 8 to project and display an image corresponding to the image signal input from the outside on the retina of the user, and then the process is performed in step S4. Move to.

  Next, in step S4, the control unit 110 determines whether or not the power is turned off. If it is determined that the power is turned off (step S4: YES), the main process is terminated and the power is turned off. If it is determined that it is not (step S4: NO), the process proceeds to step S1.

  In step S5, control unit 110 determines whether or not other control execution conditions are satisfied. If it is determined that other control execution conditions are satisfied (step S5: YES), the process proceeds to step S5. The process moves to S6 to execute another control execution process, and then the process moves to step S4.

  In other control execution processing, the control unit 110 refers to various flags stored in the second storage unit 104, and executes various types of processing such as data reproduction processing and stop processing as processing corresponding to the flags.

  If controller 110 determines in step S5 that the other control execution conditions are not satisfied (step S5: NO), it moves the process to step S4.

(Outgoing intensity / outgoing timing adjustment processing)
Next, the emission intensity / exit timing adjustment process performed by the control unit 110 in step S2 of the main process shown in FIG. 5 will be described.

  In this emission intensity / emission timing adjustment process, as shown in FIG. 7, the control unit 110 first performs an inspection light emission process (step S11), and then moves the process to step S12.

  In step S11, as shown in FIG. 6, the control unit 110 has a constant intensity laser beam as inspection light in a region outside the effective scanning range Za in the scanning range Z of the laser beam by the optical scanning unit. Is scanned at a predetermined timing.

  At this time, the control unit 110 outputs an image signal for scanning one line of the green monochromatic laser beam G as the inspection light in the region between the upper end of the effective scanning range Za and the upper end of the scanning range Z. Output from the supply circuit 3 to the G laser driver 9.

  Next, in step S12, the control unit 110 determines whether there is an input of the BD signal 7 from the BD sensor 31, and when determining that there is an input of the BD signal (step S12: YES), the process is performed. When the process proceeds to step 13 and it is determined that the BD signal 7 is not input (step S12: NO), the emission intensity / emission timing adjustment process is terminated, and the process proceeds to step S3 in the main process.

  In step S12, the control unit 110 detects that the BD signal 7 has been input by detecting the rising edge of the input BD signal 7, and specifically, the input BD signal 7 is input. When the current amplitude value is equal to the light reception timing detection current value stored in the second storage unit 104, it is determined that the BD signal 7 is present.

  Next, in step S <b> 13, the control unit 110 determines whether or not the detection timing of the BD signal 7 input from the BD sensor 31 is equal to the predicted light reception timing stored in the second storage unit 104.

  Here, the control unit 110 compares the detection timing of the BD signal detected in step S12 with the predicted light reception timings T1 and T2 stored in the second storage unit 104, and detects the detection timing and prediction of the BD signal 7. It is determined whether or not the light reception timings T1 and T2 are equal.

  When the control unit 110 determines that the detection timing of the BD signal 7 and the predicted light reception timings T1 and T2 are equal (step S13: YES), the control unit 110 moves the process to step S14, and detects and predicts the detection timing of the BD signal 7. If it is determined that the light reception timings T1 and T2 are not equal (step S13: NO), the process proceeds to step S15.

  In step S15, the control unit 110 determines whether or not the detection timing of the BD signal 7 is delayed from the predicted light reception timing. If it is determined that the detection timing is delayed (step S15: YES), the process proceeds to step S16. If it is determined that there is no delay (step S15: NO), the process proceeds to step S17.

  Next, in step S16, the control unit 110 calculates the delay of the detection timing of the BD signal 7 from the predicted light reception timings T1 and T2, and based on the calculation result, the timing at which the previous light source unit 2 emits the laser light. After executing the process of shortening the time from the first to the next emission timing, the process proceeds to step S14.

  Further, in step S17, the control unit 110 determines whether or not the detection timing of the BD signal 7 is ahead of the predicted light reception timing. If it is determined that the detection is progressing (step S17: YES), the process is stepped. If the process proceeds to S18 and it is determined that the process has not progressed (step S17: NO), the process proceeds to step S14.

  Next, in step S18, the control unit 110 calculates the advance of the detection timing of the BD signal 7 from the predicted light reception timings T1 and T2, and based on the calculation result, the timing at which the laser light is emitted from the previous light source unit 2 After executing the process of extending the time from the first to the next emission timing, the process proceeds to step S14.

  Next, in step S14, the control unit 110 determines whether or not the current amplitude value of the BD signal 7 is equal to the set current value stored in the second storage unit 104. (Step S14: YES), the emission intensity / exit timing adjustment process is terminated, and the process proceeds to step S3 in the main process.

  Next, in step S19, the control unit 110 determines whether or not the current amplitude value of the BD signal 7 is smaller than the set current value stored in the second storage unit 104. (Step S19 YES), the process proceeds to Step S20, and when it is determined that the process is not small (Step S19: NO), the process proceeds to Step S21.

  Next, in step S20, the control unit 110 calculates the difference between the current amplitude value of the BD signal 7 and the set current value, and increases the intensity of the laser light to be emitted to the light source unit 2 next time based on the calculation result. After that, the exit intensity / exit timing adjustment process is terminated, and the process proceeds to step S3 in the main process.

  In step S21, the control unit 110 determines whether or not the current amplitude value of the BD signal 7 is larger than the set voltage value stored in the second storage unit 104. If the process proceeds to step S22 and it is determined that the process is not large (step S21: NO), the emission intensity / exit timing adjustment process is terminated, and the process proceeds to step S3 in the main process.

  Next, in step S22, the control unit 110 calculates the difference between the current amplitude value of the BD signal 7 and the set current value, and reduces the intensity of the laser light to be emitted to the light source unit 2 next time based on the calculation result. After that, the exit intensity / exit timing adjustment process is terminated, and the process proceeds to step S3 in the main process.

  As described above, the optical scanning device 1 of the present embodiment is configured to emit the inspection light only from the G laser 12 which is one of the three light sources when the inspection light is emitted. Therefore, the power consumption required for emitting the inspection light can be reduced as much as possible.

  Moreover, in the present embodiment, since the green laser light having the highest visual sensitivity among the three primary colors is emitted as the inspection light, the brightness of the display image becomes the brightness desired by the user. Thus, it can be adjusted easily.

  In the above embodiment, the control unit 110 emits the inspection light only from the G laser 12, and the inspection light is detected by the BD sensor 31. However, the inspection light emission form and the inspection light are used. The light detection mode is not limited to this. For example, the three primary color inspection lights simultaneously emitted from the B laser 11, the G laser 12, and the R laser 13 are superimposed and emitted from the light source unit 2. The control unit 110 may be configured to adjust the emission timing of the laser light emitted from the light source unit 2 based on the superimposed inspection light emitted from the light source unit 2.

  With this configuration, it is possible to prevent chromatic aberration from occurring due to the plurality of optical systems included in the optical scanning device 1.

  That is, when chromatic aberration has occurred in the optical system of the optical scanning device 1, as described above, when the inspection light of the three primary colors is superimposed and emitted from the light source unit 2 and detected by the BD sensor 31, the BD sensor 31 does not detect the inspection light as a single white scanning line or a single white point, but detects it as a plurality of scanning lines having different colors or a plurality of points having different colors. In the case where there is no occurrence, the BD sensor 31 detects the inspection light as one white scanning line or one white point.

  For this reason, the inspection light of the three primary colors is simultaneously emitted to each light source, and the inspection light is overlapped by the coupling optical system 16 to be emitted from the light source unit 2, and from the light source unit 2. The control unit 110 is configured to adjust the emission timing of the laser light emitted from the light source unit 2 so that the BD sensor 31 detects the emitted inspection light as one white scanning line or one white point. As a result, even if chromatic aberration occurs in the optical system of the optical scanning device 1, the chromatic aberration can be eliminated.

  Further, in the above embodiment, the inspection light is scanned by one line outside the effective scanning range in the scanning range Z of the laser light, detected by the BD sensor, and emitted from the light source unit 2 based on the detection result. The laser beam emission intensity and the emission timing are adjusted. For example, the control unit 110 controls the inspection light to have a plurality of horizontal lines outside the effective scanning range Za in the laser beam scanning range Z. A configuration may be adopted in which the inspection light is emitted from the light source unit 2 so as to be continuously scanned, and the inspection light scanned for a plurality of lines may be detected by a BD sensor.

  When configured in this way, the control unit 110 scans a plurality of lines of inspection light of any one of the three primary colors continuously outside the effective scanning range Za in the scanning range Z. The line-scanned inspection light is sequentially detected by the BD sensor 31, and the intensity of the laser light emitted from the light source unit 2 and the emission timing are adjusted using the average value of the detection results.

  With this configuration, a detection result with higher reliability can be obtained than the detection result obtained by causing the BD sensor 31 to scan one line of inspection light and detect the laser emitted from the light source unit 2. Reliability regarding the adjustment of light intensity and emission timing is improved.

  Further, when the inspection light is scanned continuously for a plurality of lines outside the effective scanning range Za in the scanning range Z in this way, the control unit 110 transmits the inspection light to be detected by the BD sensor to the B laser 11, G The laser 12 and the R laser 13 are emitted from the light sources at different timings and detected by the BD sensor 31, and the intensity and emission timing of the laser light emitted from the light source unit 2 are adjusted based on the detection result. May be.

  In the case of such a configuration, the control unit 110 first scans one line of the green inspection light G outside the effective scanning range Za in the laser light scanning range Z, as shown in FIG. Next, the video signal 4 is output to each of the B laser driver 8, the G laser driver 9, and the R laser driver 10 so that the blue inspection light B is scanned by one line and then the red inspection light R is scanned. To do.

  Then, the control unit 110 detects the intensity of the laser light output from the light source unit unit 2 based on the detection timing and the current amplitude value of the BD signal 7 that the BD sensor 31 detects and outputs each of the three primary color inspection lights. And the emission timing are adjusted.

  With this configuration, for each of the three light sources B laser 11, G laser 12, and R laser 13 that emit laser light of three primary colors, the intensity and emission timing of the laser light are individually set for each color. Since it can be adjusted, the adjustment accuracy of the intensity of the laser beam and the emission timing can be further improved.

  Further, in this way, the inspection light to be detected by the BD sensor is emitted from the respective light sources of the B laser 11, G laser 12, and R laser 13 at different timings and detected by the BD sensor 31, and based on the detection result. When adjusting the intensity and emission timing of the laser light emitted from the light source unit 2, each time one frame image is displayed, the inspection light of one color different from each other among the three primary colors is displayed from the light source unit 2. The inspection light may be emitted from the light source unit 2 so that at least one line or more is scanned outside the effective scanning range Za in the scanning range Z.

  When configured in this way, the control unit 110, as shown in FIG. 9A, displays an image for the blue inspection outside the effective scanning range Za in the scanning range Z when displaying the first frame image. A video signal for scanning one line of the light B is output to the B laser driver 8, the blue inspection light B is detected by the BD sensor 31, and the laser light emitted from the B laser 11 is detected based on the detection result. Adjust intensity and emission timing.

  Next, as shown in FIG. 9B, when the second frame image is displayed, the control unit 110 applies the green inspection light G to the outside of the effective scanning range Za in the scanning range Z. A video signal for line scanning is output to the G laser driver 9, the green inspection light G is detected by the BD sensor 31, and the intensity and emission timing of the laser light emitted from the G laser 12 based on the detection result. Adjust.

  Next, as shown in FIG. 9C, the control unit 110 applies red inspection light R to the outside of the effective scanning range Za in the scanning range Z when displaying the image of the third frame. A video signal for line scanning is output to the R laser driver 10, the red inspection light R is detected by the BD sensor 31, and the intensity and emission timing of the laser light emitted from the R laser 13 based on the detection result. Adjust.

  With this configuration, only one light source that emits the inspection light is required during the display of one frame image, so that power consumption required for adjusting the intensity of the emitted laser light and the emission timing can be reduced. Can do.

  In addition, while displaying the three-frame image, the intensity and the emission timing of the laser light emitted individually can be adjusted for all three light sources emitting the laser light of the three primary colors. Adjustment accuracy of the intensity of the laser beam and the emission timing can be improved.

  As described above, some of the embodiments of the present invention have been described in detail with reference to the drawings. However, these are merely examples, and various embodiments can be made based on the knowledge of those skilled in the art including the aspects described in the section of the disclosure of the invention. The present invention can be implemented in other forms that have been modified or improved. For example, it goes without saying that the optical scanning apparatus to which the present invention is applied can also be applied to an optical scanning apparatus that scans a laser beam in a laser printer.

It is explanatory drawing which shows the optical scanning device of this embodiment. It is explanatory drawing which shows the video signal supply circuit in this embodiment. It is explanatory drawing which shows the arrangement | positioning position of the photon detection part in this embodiment. It is explanatory drawing which shows the waveform of the detection result signal which the photon detection part of this embodiment outputs. It is explanatory drawing which shows the process which the control part which the optical scanning device of embodiment has has. It is explanatory drawing which shows the scanning aspect of the inspection light in the optical scanning device of this embodiment. It is explanatory drawing which shows the process which the control part which the optical scanning device of embodiment has has. It is explanatory drawing which shows the scanning aspect of the inspection light in the optical scanning device of this embodiment. It is explanatory drawing which shows the scanning aspect of the inspection light in the optical scanning device of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical scanning device 2 Light source unit part 19 Horizontal scanning system 21 Vertical scanning system 31 BD sensor 31a Shading mask

Claims (10)

In an optical scanning device having a light emitting unit that emits light according to an image signal, and an optical scanning unit that scans light emitted from the light emitting unit,
A light detector disposed at a position outside the effective scanning range of the scanning range of the light scanning unit;
A shielding unit that is provided at least around the light detection unit among positions outside the effective scanning range, and shields light outside the effective scanning range without shielding light to the light detection unit;
Based on the light detected by the light detection unit, a control unit for adjusting the timing and intensity of the light emitted from the light emission unit,
An optical scanning device comprising: The light emitting section includes a plurality of light sources corresponding to the three primary colors, respectively, and emits inspection light having a constant intensity from at least one of the plurality of light sources at a predetermined timing outside the effective scanning period. ,
2. The light according to claim 1, wherein the control unit adjusts the intensity of light emitted from at least the light source that has emitted the inspection light based on the inspection light detected by the light detection unit. Scanning device. The light emitting unit emits the inspection light of three primary colors from the plurality of light sources,
The optical scanning device according to claim 2, wherein the control unit adjusts the intensity of light emitted from the plurality of light sources based on the inspection light of the three primary colors detected by the light detection unit. .   The said control part adjusts the timing of the light radiate | emitted from the said light-projection part based on the inspection light of at least 1 color among the said 3 primary color inspection lights. The Claim 2 or Claim 3 characterized by the above-mentioned. Optical scanning device. The light emitting portion emits the inspection light of the three primary colors in an overlapping manner,
4. The optical scanning device according to claim 3, wherein the control unit adjusts the timing of light emitted from the light emitting unit based on the superimposed inspection light emitted from the light emitting unit. 5. The light detection unit includes a photoelectric conversion element that outputs a detection result signal corresponding to the intensity of the received inspection light,
The control unit adjusts the timing of light emitted from the light emitting unit based on the change timing of the detection result signal, and adjusts the intensity of light emitted from the light source based on the intensity of the detection result signal. The optical scanning device according to claim 2, wherein: The optical scanning unit includes a high-speed scanning unit that scans light at a relatively high speed with respect to the first scanning direction, and a second scanning direction that is a direction that intersects or is orthogonal to the first scanning direction. And a low-speed scanning unit that scans light at a relatively low speed,
The control unit emits inspection light to be detected by the light detection unit from each light source at different timings, and causes the inspection light to scan one line in the first scanning direction outside the effective scanning range. The optical scanning device according to claim 1, wherein the optical scanning device is characterized in that: The optical scanning unit includes a high-speed scanning unit that scans light at a relatively high speed with respect to the first scanning direction, and a second scanning direction that is a direction that intersects or is orthogonal to the first scanning direction. And a low-speed scanning unit that scans light at a relatively low speed,
The control unit emits the inspection light from the light emitting unit so that the inspection light is continuously scanned in a plurality of lines in the first scanning direction outside the effective scanning range. The optical scanning device according to claim 1.   An optical scanning type comprising the optical scanning device according to any one of claims 1 to 8, wherein the optical scanning device scans light modulated according to an image signal to project and display an image on a projection surface. Image display device.   An optical scanning image display device according to claim 9 is provided, and an image is projected onto at least one retina of a user by scanning the light modulated in accordance with an image signal with the optical scanning device, thereby displaying the image. Retina scanning image display device.

Images