JP2005309264A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus in which a head-mount part is miniaturized while keeping a large picture display. <P>SOLUTION: The image display apparatus comprises: a modulated light output part 2 which outputs modulated light which is modulated according to an image information; a scanning part 4 which outputs the modulated light H outputted from the modulated light output part 2 as scanning light; and a transfer optical system 5 which is provided at the rear stage of the scanning part 4 and guides the scanning light to the pupil of an observer. The image display apparatus is characterized by being provided with: the head-mount part 6 which is mounted on the head of the observer, in which at least a part of the transfer optical system 5 among the scanning part 4 and the transfer optical system 5 is provided; and a body-carrying part 7 mounted on the body of the observer to be carried, in which at least the modulated light output part 2 among the modulated light output part 2 and the scanning part 4 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display apparatus that scans modulated light that has been intensity-modulated by an image signal and then guides it to the pupil of an observer's eye to display an image.

  As an image display device in which modulated light is guided to a pupil of an observer's eye to display an image, a retinal scanning image display device is known as shown in Patent Document 1. As this type of image display device, a head-mounted type is known.

The head-mounted image display device is a type of image display device in which an observer enjoys an image while wearing the head.
JP2000-1111829

  By the way, the head-mounted image display device has an advantage of being able to display a large screen independently of the size of the device. On the other hand, if sufficient weight reduction and miniaturization cannot be achieved, the head-mounted image display device is long. There is a problem that it is difficult to wear time.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide an image display device that realizes further weight reduction and downsizing of the head mounting portion while ensuring a large screen display. It is in.

  According to the first aspect of the present invention, a modulated light output unit that outputs light as modulated light modulated according to image information, and the modulated light output from the modulated light output unit is output as scanning light. An image display device comprising: a scanning unit; and a transfer optical system that is provided at a subsequent stage of the scanning unit and guides the scanning light to an observer's pupil, and includes at least the scanning unit and the transfer optical system. A part of the transfer optical system is provided, and is provided with a head mounting portion that is mounted on the head of the observer, and at least the modulated light output portion of the modulated light output portion and the scanning portion, It is characterized by having a portable body part that can be carried on the body of a person.

  According to a second aspect of the present invention, in the image display device according to the first aspect, the body portable unit includes a first correction unit capable of correcting the direction of the optical axis of the modulated light emitted from the body portable unit. It is characterized by having.

  According to a third aspect of the present invention, in the image display device according to the first or second aspect, the body portable unit is configured to scan light according to a separation distance between the head mounting unit and the body portable unit. A second correction unit capable of adjusting the imaging position in the optical axis direction is provided.

  According to a fourth aspect of the present invention, in the image display device according to the second or third aspect of the present invention, the image display device further includes a first detection unit that detects a direction in which the head-mounted unit with respect to the body portable unit is present. The first correction unit corrects the optical axis of the modulated light emitted from the body portable unit so as to be directed in the direction in which the head-mounted unit exists.

  According to a fifth aspect of the present invention, in the image display device according to the fourth aspect, the first detection unit is provided in either the head-mounted unit or the body portable unit and outputs inspection light. Spot position detection including an inspection light output unit, and a position detection element that is provided on the other of the head mounting unit or the body portable unit and receives the inspection light and outputs a signal corresponding to the center position of the light receiving spot And a determination unit that determines the direction of the optical axis of the inspection light based on the light spot position detected by the spot position detection unit.

  According to a sixth aspect of the present invention, in the image display device according to the fifth aspect, the body portable unit includes the scanning unit, and the first correction unit includes the scanning unit of the body portable unit and the head mounting. And an optical element that is displaceable in a plane perpendicularly intersecting the optical axis of the scanning unit, and the optical element according to the direction of the optical axis of the inspection light detected by the first detection unit And a driving unit for displacing the head, so that the direction of the scanning light emitted from the body portable unit matches the direction of the head-mounted unit.

  A seventh aspect of the present invention is the image display device according to any one of the third to sixth aspects, further comprising a second detection unit that obtains a distance between the body portable unit and the head-mounted unit. The second correction unit controls an imaging position of the modulated light in an optical axis direction according to a distance between the body carrying unit and the head mounting unit.

  The invention according to claim 8 is the image display device according to claim 7, wherein the second detection unit is provided in either the head-mounted unit or the body portable unit and outputs inspection light. An inspection light output unit, and a diffusion detection unit that is provided on the other of the head mounting unit or the body portable unit and detects the degree of diffusion of the inspection light, and based on the degree of diffusion of the inspection light A distance between the mounting portion and the body portable portion is obtained.

  According to a ninth aspect of the present invention, in the image display device according to any one of the third to eighth aspects, the body portable unit includes the scanning unit, and the second correction unit includes the modulated signal. By controlling the light to diffuse or converge, the imaging position is controlled in the direction of the optical axis in accordance with the space between the scanning unit of the body portable unit and the head-mounted unit. .

  According to a tenth aspect of the present invention, in the image display device according to the ninth aspect, the second correction unit is configured by a wavefront modulation control unit.

  The invention according to claim 11 is the image display device according to claim 5 or claim 8, wherein the first detection unit or the second detection unit is mounted on an observer's head. When the presence is detected, the modulated light output unit is operated, and the first detection unit or the second detection unit is not detected the presence of the head mounting unit mounted on the observer's head. A modulated light output control unit that controls the modulated light output unit so as not to operate the modulated light output unit is provided.

  According to a twelfth aspect of the present invention, in the image display device according to any one of the first to eleventh aspects, the transfer optical system includes one or a plurality of lenses. It is.

  According to a thirteenth aspect of the present invention, in the image display device according to any one of the first to twelfth aspects, the transfer optical system includes a diffractive element.

  According to a fourteenth aspect of the present invention, in the image display device according to any one of the second to thirteenth aspects, the head mounting unit corrects the direction of the optical axis of the modulated light incident from the body portable unit. A possible third correction unit is provided.

  The invention according to claim 15 is the image display device according to claim 14, wherein the body portable unit includes the scanning unit, and the third correction unit includes the scanning unit of the body portable unit and the head mounting. And an optical element that is displaceable in a plane perpendicularly intersecting the optical axis of the scanning unit, and the optical element according to the direction of the optical axis of the inspection light detected by the first detection unit And a driving unit for displacing the optical element so that the direction of the scanning light emitted from the optical element coincides with the eyes of the observer.

  According to the first aspect of the present invention, the weight of the head mounting portion mounted on the observer's head can be reduced, and an image can be displayed for a long time.

  According to the second aspect of the present invention, even if the direction of the portable body portion with respect to the head mounting portion varies, the modulated light can be appropriately guided from the portable body portion to the head mounting portion.

  According to the third aspect of the invention, even if the distance between the head-mounted part and the body portable part varies, a good image can be obtained by adjusting the imaging position of the scanning light according to the distance. Can be displayed.

  According to the fourth aspect of the invention, the first correction unit can appropriately guide the modulated light to the head-mounted unit based on the detection result of the first detection unit.

  According to the fifth aspect of the present invention, it is possible to appropriately detect the direction of the head mounting portion using the position detection element, and appropriately guide the modulated light to the head mounting portion.

  According to the sixth aspect of the present invention, the modulated light is guided from the scanning unit to the head by displacing the optical element in a direction perpendicular to the optical axis of the scanning unit. It can be introduced into the mounting part.

  According to the seventh aspect of the present invention, the imaging position of the modulated light can be accurately controlled even if the distance between the head mounting portion and the body portable portion varies.

  According to the invention described in claim 8, by detecting the degree of diffusion of the inspection light that is examined from either the head-mounted part or the body-portable part toward the other, the head-mounted part and the body-portable part are detected. The distance between the parts can be obtained.

  According to the invention described in claim 9, by controlling the modulated light so as to diffuse or converge, the imaging position of the modulated light is determined according to the distance between the head mounting portion and the body portable portion. Can be controlled.

  According to the invention described in claim 10, by controlling the wavefront modulation control, the imaging position of the modulated light can be adjusted in the optical axis direction.

  According to the eleventh aspect of the present invention, it is detected whether or not the head mounting portion is mounted on the head of the observer, and the modulation is efficiently performed only when the head mounting portion is mounted on the head. The light output can be activated.

  According to the twelfth aspect of the present invention, the transfer optical system can be configured by a combination of one or a plurality of lenses.

  According to invention of Claim 13, a transfer optical system can be comprised by utilizing a diffraction element.

  According to the fourteenth aspect of the present invention, even if the direction of the body portable unit varies with respect to the head-mounted unit, the modulated light can be appropriately guided to the eyes of the observer.

  According to the invention described in claim 15, by modulating the optical element in a direction perpendicular to the optical axis of the scanning unit, the modulated light is guided from the optical element to the observer by being guided by the optical element. It can be properly guided to the eyes.

  1 to 9 show a first embodiment of an image display device. As shown in FIG. 1, the image display device 1 includes a modulated light output unit 2 that outputs light as modulated light H that is intensity-modulated according to image information V, a wavefront modulation control unit 3, and a modulated light output. A scanning unit 4 that outputs the modulated light H output from the unit 2 as scanning light, and a transfer optical system 5 that is provided at a subsequent stage of the scanning unit 4 and guides the scanning light to the pupil of the observer.

  The image display device 1 includes a head mounting unit 6 mounted on the observer's head and a body portable unit 7 carried on the observer's body. The head mounting portion 6 is provided with one convex lens 8 of the two convex lenses 8 and 9 constituting the transfer optical system 5 and a part of an azimuth / distance detection system described later. The body portable unit 7 is provided with a modulated light output unit 2, a wavefront modulation control unit 3, a scanning unit 4, and the other convex lens 9 in the transfer optical system 5.

  The head mounting part 6 has an apparatus frame 10 as shown in FIG. The apparatus frame 10 is formed in a form that can be easily worn on the observer's head, for example, in the shape of glasses as shown in FIG. As described above, when the device frame 10 is formed in a spectacle shape, the convex lens 8 is attached to a portion of the device frame 10 where the lens is attached, as shown in FIG. Further, the device frame 10 is provided with a light emitting portion R (shown in FIG. 1).

  Moreover, the body portable part 7 can be formed in what is called a handy type that an observer can hold by hand.

  As shown in FIG. 1, the body portable unit 7 is provided with a first detection unit 11 that detects the direction in which the head-mounted unit 6 exists with reference to the body portable unit 7. In addition, the body portable unit 7 is provided with a second detection unit 12 that detects the distance between the head mounting unit 6 and the body portable unit 7. Further, the body portable unit 7 is provided with a first correction unit 13, and when the head mounting unit 6 moves in the up-down direction or the left-right direction, the first correction unit 13 also performs the first correction based on the direction information detected by the first detection unit 11. The correction unit 13 corrects the direction of the modulated light H emitted from the scanning unit 4 toward the head mounting unit 6. Further, the head mounting unit 6 is provided with a third correction unit 14, and even when the head mounting unit 6 moves in the vertical direction or the left-right direction, the first correction unit 11 is configured based on the direction information detected by the first detection unit 11. The three correction units 14 correct the direction of the modulated light H that is emitted from the scanning unit 4 and incident on the head mounting unit 6. As described above, the first correction unit 13 and the third correction unit 14 can accurately input the modulated light H from the scanning unit 4 toward the convex lens 8 of the head mounting unit 6.

  Further, based on the distance information between the body portable unit 7 and the head-mounted unit 6 detected by the second detection unit 12, the wavefront modulation control unit 3 sets the imaging position of the modulated light H in the optical axis direction. Be controlled.

  Next, based on FIG.3 and FIG.4, the specific structure of the 1st detection part 11 is demonstrated. FIG. 3 shows a state in which the convex lens 17 and the light emitting unit R are installed on the front side of the spot position detection unit 15. FIG. 4 is a left side view of FIG. The first detection unit 11 includes a light emitting unit R provided in the head mounting unit 6, a spot position detection unit 15 provided in the body portable unit 7, a direction determination unit 16, and the front side of the spot position detection unit 15. And a convex lens 17 provided on the surface. The light emitting unit R is an optical element that constantly outputs the inspection light K. The light emitting unit R can be configured by, for example, an infrared LED.

  The spot position detection unit 15 is an optical element including a position detection element that receives the inspection light K and outputs a signal corresponding to the center position of the light reception spot. Since the position detection element is an electronic device generally known as PSD (Position Sensing Device), description of the configuration thereof is omitted.

  Further, the direction determination unit 16 is a device for obtaining a direction signal α in which the light emitting unit R exists, as will be described later, based on a signal output from the position detection element, that is, an inspection light spot center position signal.

  Next, a method of detecting the azimuth in which the light emitting unit R exists with the first detection unit 11 configured as described above as a reference will be described with reference to FIGS. 3 and 4. Here, the center of the position detection element is the origin G, and the X, Y, and Z axes that pass through the origin G are set. The center of the convex lens 17 faces the origin G, and the X, Y, and Z coordinates of the center of the convex lens 17 are (0, 0, a). Further, it is assumed that the X coordinate, Y coordinate, and Z coordinate of the light emitting unit R are (X1, Y1, b). Here, a is the distance in the Z direction between the convex lens 17 and the origin G. Further, b is a distance in the Z direction between the light emitting portion R and the origin G.

  In this state, as shown in FIG. 4, the inspection light K output from the light emitting unit R passes through the convex lens 17 and forms a circular spot on the position detection element of the spot position detection unit 15. To do. At this time, it is not necessary to form a complete image and converge to one point. The center position of the circular spot is the intersection of the straight line connecting the light emitting portion R and the center R of the convex lens 17 and the surface of the spot position detecting portion 15. As shown in FIGS. 3 and 4, the X and Y coordinates of the spot center position of the inspection light K are (X2, Y2). The direction signal α is a direction cosine (X2 / a, Y2 / a) indicating the direction in which the light emitting unit R exists.

  Next, a specific configuration of the second detection unit 12 will be described with reference to FIG. The second detection unit 12 shields a part of the inspection light K reflected by the half mirror 18 and the half mirror 18 provided between the convex lens 17 and the spot position detection unit 15 and transmits the inspection light K twice. A light shielding plate 19 provided at a position to be separated into two, convex lenses 20 and 21 respectively receiving two separated inspection lights K1 and K2, and spot position detection provided at a position facing each convex lens 20 and 21. Parts 22 and 23.

  Next, a method for obtaining a distance between the light emitting unit R and the body portable unit 7 by the second detection unit 12 configured as described above, that is, a distance between the head mounting unit 6 and the body portable unit 7. Will be described with reference to FIG. As indicated by the solid line in FIG. 5, the inspection light K emitted from the light emitting portion R passes through the convex lens 17 and is then partially reflected by the half mirror 18. The inspection light K transmitted through the half mirror 18 reaches the spot position detection unit 15. On the other hand, the inspection light K reflected by the half mirror 18 converges at the convergence point S1, and again becomes diffused light and is separated into two by the light shielding plate 19. Each of the inspection lights K1 and K2 separated into two forms an image on the spot position detection units 22 and 23 by passing through the convex lenses 20 and 21. At this time, it is not necessary to focus completely, and a circular spot out of focus may be used.

  Next, it is assumed that the light emitting unit R, that is, the head mounting unit 6 approaches the body carrying unit 7. In this case, as shown by the one-dot chain line in FIG. Accordingly, the inspection light K is reflected by the half mirror 18 and converges to the convergence point S2 as indicated by the alternate long and short dash line, but the convergence point S2 of the inspection light K is greater than the convergence point S1 as shown in FIG. Is also located away from the half mirror 18. For this reason, the distance between the imaging positions N3 and N4 on the straight line connecting the convergence point S2 and the centers of the two convex lenses 20 and 21 is the distance between the imaging positions N1 and N2. It is longer than.

  In this way, by measuring the positions N1, N2, N3, and N4 of the image formed by separating the inspection light K into two by the light shielding plate 19, the space between the light emitting part R and the body portable part 7 is measured. The distance can be obtained. The diffusion detection unit 100 is configured by the light shielding plate 19, the convex lenses 20 and 21, the spot position detection unit 15, and the determination unit 24. The diffusion detection unit 100 detects the distance between the light emitting unit R and the body portable unit 7 based on the degree of diffusion of the inspection light K, that is, the distance between the head-mounted unit 6 and the body portable unit 7. It can be The determination unit 24 outputs a distance detection signal β according to the distance between the light emitting unit R and the spot position detection unit 15, that is, the distance between the head mounting unit 6 and the body portable unit 7. .

  Next, the first correction unit 13 will be described. As shown in FIG. 6, the first correction unit 13 provided in the body portable unit 7 includes one convex lens 9 that constitutes the transfer optical system 5, an actuator 25, and a drive circuit 26.

  As shown in FIG. 7, the convex lens 9 can be moved in a direction orthogonal to the optical axis L (shown in FIG. 7) of the scanning unit 4 (shown in FIG. 1) while being supported by the support frame W, for example. Is provided. Moreover, the actuator 25 can be comprised by the piezoelectric element etc., for example. In this way, when the actuator 25 is composed of piezoelectric elements, as shown in FIG. 7, the convex lenses 9 are provided as described above by providing piezoelectric elements at orthogonal positions and controlling the voltage supplied to these piezoelectric elements. Furthermore, it can move in the direction orthogonal to the optical axis L of the scanning unit 4.

  The driving circuit 26 is transmitted from a radio (not shown) provided in the body portable unit 7 and received by a radio (not shown) provided in the device frame 10. The convex lens 9 is moved as described above by controlling the electric power supplied to the actuator 25 based on the detection result.

  As shown in FIG. 1, the head mounting unit 6 is provided with a third correction unit 14 for causing the modulated light incident on the convex lens 8 to accurately enter the eye M of the observer. The third correction unit 14 includes the other convex lens 8 constituting the transfer optical system 5, an actuator 27, and a drive circuit 28.

  As shown in FIG. 7, the convex lens 8 is movable in a direction orthogonal to the optical axis L (shown in FIG. 7) of the scanning unit 4 (shown in FIG. 1) while being supported by the support frame W, for example. Is provided. The actuator 27 can be constituted by, for example, a piezoelectric element. In this way, when the actuator 27 is constituted by a piezoelectric element, as shown in FIG. 7, the convex lens 8 is provided as described above by providing piezoelectric elements at orthogonal positions and controlling the voltage supplied to these piezoelectric elements. It can move in a direction orthogonal to the optical axis of the scanning unit 4.

  Further, the drive circuit 28 constituting a part of the third correction unit 14 is provided in the apparatus frame 10 by inputting the direction signal α from the first detection unit 11 based on the detection result of the first detection unit 11. The convex lens 8 is moved as described above by controlling the power supplied to the actuator 27 from a battery (not shown).

  Next, the first correction unit 13 configured as described above corrects the direction of the modulated light H emitted from the scanning unit 4 toward the head-mounted unit 6, and the third correction unit 14 performs scanning. A method for correcting the direction of the modulated light H emitted from the unit 4 and incident on the head-mounted unit 6 will be described with reference to FIG. In the following description, the case where the modulated light H is in the state of parallel rays will be described. The convex lenses 8 and 9 are assumed to have the same focal length.

  First, as shown in FIG. 6A, it is assumed that the optical axis of the scanning unit 4 coincides with the optical axes of the convex lenses 8 and 9, and the eye M of the observer is located on the optical axis. This state is the most preferable state and does not require correction. In this state, the focal position F of the lens 8 and the focal position F of the convex lens 9 coincide with each other.

Next, as shown in FIG. 6B, it is assumed that the head mounting portion 6 has moved downward, that is, in the Y direction due to the observer changing his / her posture. In this case, the driving circuit 26 of the first correction unit 13 receives the direction signal α from the first detection unit 11 and moves the head mounting unit 6 in the moving direction as indicated by the solid line from the state indicated by the dotted line of the convex lens 9. That is, by moving Δy = (Y ₂ / a) · (R _i / NA) downward in the figure, the modulated light H is refracted on the moving side of the head-mounted 6, that is, downward in the figure. Let Therefore, the modulated light H can enter from the scanning unit 4 toward the convex lens 8 of the head mounting unit 6. That is, the first correction unit 13 is configured to match the direction of the modulated light H emitted from the body portable unit 7 with the direction of the head-mounted unit 6. Here, Y ₂ / a is included in α. R _i represents the radius of the convex lens 9, and NA represents the numerical aperture of the convex lens 9.

  On the other hand, the drive circuit 28 of the third correction unit 14 receives the direction signal α from the first detection unit 11, and the convex lens 8 in the head mounting unit 6 is shown as a solid line from the dotted line in the upper part of the figure. By moving Δy in the direction, the modulated light H that has passed through the convex lens 9 and converged to the focal position F becomes parallel modulated light H by passing through the convex lens 8 and enters the eye M of the observer. become. In other words, the third correction unit 14 matches the direction of the modulated light H incident on the convex lens 8 of the head mounting unit 6 from the scanning unit 4 with the direction of the eye M of the observer.

  Next, the configuration of the wavefront modulation control unit 3 constituting the second correction unit 14 as described above will be described with reference to FIG. The wavefront modulation control unit 3 includes a convex lens 30, a position variable mirror 31, a mirror driving unit 32, and a control unit 33. As shown in FIG. 1, the modulated light H transmitted from the modulated light output unit 2 via the optical fiber 34 is guided to the wavefront modulation control unit 3 by the half mirror 35. The control unit 33 receives a depth signal from the modulated light output unit 2, drives the mirror driving unit 32 based on the depth signal, and moves the position variable mirror 31 closer to or away from the convex lens 30. Although the modulated light H is controlled to be diffused, parallel, and converged, the distance detection signal β is input from the second detection unit 12 in this embodiment. The distance detection signal β is a signal similar to the depth signal, and the control unit 33 diffuses and parallelizes the modulated light H by moving the position variable mirror 32 closer to or away from the convex lens 39 based on the distance detection signal β. , Control to converge.

  Next, the operation of the wavefront modulation control unit 3 will be described. First, the control unit 33 controls the power supplied to the piezoelectric elements constituting the mirror driving unit 32, so that the position variable mirror 31 is closer to the convex lens 30 than the focal position of the convex lens 39, as shown in FIG. Suppose that it is aligned with a. In this state, as shown in FIG. 1, the modulated light H output from the modulated light output unit 2 via the optical fiber 34 has its optical path changed by the half mirror 35, and is condensed by the convex lens 30. Reflected by the variable mirror 31. By the way, since the position variable mirror 31 is located at a position a closer to the convex lens 30 than the focal position f of the convex lens 30, the modulated light H reflected by the position variable mirror 31 is as shown in FIG. Since the focal point is formed after being reflected by the position variable mirror 31, the modulated light S reflected by the position variable mirror 31 and having passed through the convex lens 30 cannot be a parallel light beam, but becomes a diffused light beam as shown in FIG. .

  Next, it is assumed that the voltage applied to the piezoelectric element serving as the mirror driving unit 32 is controlled so that the position of the position variable mirror 31 is aligned with the focal position f of the convex lens 30. In this state, as shown in FIG. 1, the modulated light H transmitted by the optical fiber 34 is guided to the convex lens 30 by the half mirror 35, passes through the convex lens 30, and is focused on the position variable mirror 31. The modulated light H is reflected by the position variable mirror 31. Here, since the position variable mirror 31 is located at the focal position f of the convex lens 30, the modulated light H reflected by the position variable mirror 31 passes through the convex lens 30 again and becomes a parallel light beam. In this way, the modulated light H can be diffused, paralleled, and converged by moving the position variable mirror 31 closer to or away from the convex lens 30. The wavefront modulation control unit 3 adjusts the imaging position of the scanning light in the optical axis direction by controlling the diffusion, parallelism, and convergence of the modulated light H, that is, the scanning light.

  Next, a method in which the wavefront modulation control unit 3 (shown in the figure) as the second correction unit controls the imaging position of the modulated light H according to the distance between the head mounting unit 6 and the body carrying unit 7. Will be described with reference to FIG. In the following description, the case where the wavefront modulation control unit 3 is not controlled by the depth signal will be described.

  As shown in FIG. 9B from the state shown in FIG. 9A, it is assumed that the head mounting portion 6 approaches the body portable portion 7 side. FIG. 9 (a) is the same diagram as FIG. 6 (a). In this case, the wavefront modulation control unit 3 (shown in FIG. 1) that has input the distance detection signal β from the second detection unit 12 shown in FIG. 5 converges the modulated light H in advance as shown in FIG. By entering the convex lens 9 in the state, the modulated light H passes through the convex lens 9 and converges to the focal position F of the convex lens 8. The modulated light H that has converged at the focal position F passes through the convex lens 8 and becomes parallel modulated light H and enters the eye M of the observer.

  Next, the configuration of the modulated light output unit 2 will be described with reference to FIG. The modulated light output unit 2 includes a video signal supply circuit 41 to which video information V from an external device is input, a red light source 42, a green light source 43, a blue light source 44, a red light source driver 45, a green light source driver 46, and a blue light source. A light source driver 47, collimator lenses 48, 49, 50, wavelength selective mirrors 51, 52, 53, and a focus lens 54 are provided. The video signal supply circuit 41 then drives the red light source 42, the green light source 43, and the blue light source 44 based on the red image signal, the green video signal, and the blue video signal supplied from an external device, respectively. Intensity modulation signals are output to the green light source driver 46 and the blue light source driver 47. Light emitted from the red light source 42, the green light source 43, and the blue light source 44 is formed into substantially parallel rays by collimating lenses 48, 49, 50, and then combined by wavelength selective mirrors 51, 52, 53. 54 is configured to enter the optical fiber 34.

  Next, the above-described scanning unit 4 will be described with reference to FIG. The scanning unit 4 includes a horizontal scanning mirror 55, a relay optical system lens 56, and a vertical scanning mirror 57.

  The horizontal scanning mirror 55 is rotatably provided by the rotation axis X1. The horizontal scanning mirror 55 reflects the modulated light H that has passed through the half mirror 35 in a direction corresponding to the rotational position of the horizontal scanning mirror 55. The rotation of the horizontal scanning mirror 55 is controlled by the horizontal control unit 58. The relay optical system lens 56 concentrates the light beam reflected by the horizontal scanning mirror 55 on the vertical scanning mirror 57.

  Further, the vertical scanning mirror 57 is provided so as to be swingable about the rotation axis X2. The swing of the vertical scanning mirror 57 is controlled by the vertical control unit 59. The vertical scanning mirror 57 reflects the modulated light H that has passed through the relay optical system lens 56 in a direction corresponding to the rotational position of the vertical scanning mirror 57.

  The operation of the image display device configured as described above will be described. When the head mounting unit 6 is displaced in the vertical direction or the left-right direction with respect to the body portable unit 7 and further displaced so as to approach or separate, the displacement is detected by the first detection unit 11 or the second detection unit 13. Then, the first correction unit 13, the third correction unit 14, or the wavefront modulation control unit 3 controls the direction of the modulated light H or the degree of diffusion, so that the modulated light H is accurately applied to the eye M of the observer. Can lead to. For this reason, the modulated light H output from the modulated output unit 2 is scanned in the vertical and horizontal directions in the scanning unit 4, transferred to the transfer optical system 5, and appropriately guided to the observer's eye M to be imaged. Is displayed.

  FIG. 10 shows a second embodiment. This second embodiment is characterized in that it includes a modulated light output controller 61. In this second embodiment, modulated light is detected only when the head mounting part 6 is mounted on the head by detecting whether or not the head mounting part 6 is mounted on the head of the observer. The output unit 2 is operated.

  When at least one of the direction signal α and the distance detection signal β is input, the modulated light output control unit 61 operates the modulated light output unit 2 to output the modulated light H, while the direction signal α The modulated light H is not output without operating the modulated light output unit 2 when both the distance detection signal β and the distance detection signal β are not input.

  The modulated light output control unit 61 is configured to turn on and off the operation of the red light source driver 45, the green light source driver 46, and the blue light source driver 47, for example, and is at least one of the direction signal α and the distance detection signal β. When one of the signals is input, the red light source driver 45, the green light source driver 46, and the blue light source driver 47 are turned on, and the red light source 42, the green light source 43, and the blue light source 44 are turned on to output the modulated light H. On the other hand, when both the direction signal α and the distance detection signal β are not input, the red light source driver 45, the green light source driver 46, and the blue light source driver 47 are turned off, and the red light source 42, the green light source 43, and the blue light source are turned off. By turning off 44, the modulated light H can be prevented from being output.

  The modulated light output controller 61 operates the video signal supply circuit 41 to output the modulated light H when receiving at least one of the direction signal α and the distance detection signal β. When both α and the distance detection signal β are not input, the modulated light H may not be output without operating the video signal supply circuit 41.

  It is also possible to form a diffractive element having the same function as the convex lenses 8, 9, 17, 20, and 21 and use the diffractive element thus formed in place of the convex lenses 8, 9, 17, 20, and 21. It is.

It is a block diagram of an image display apparatus. (First embodiment) It is an external view of an image display apparatus. (First embodiment) It is a perspective view of a 1st detection part. (First embodiment) FIG. 4 is a left side view of FIG. 3. (First embodiment) It is a block diagram of a 2nd detection part. (First embodiment) It is a side view of a 1st correction part and a 2nd correction part. (First embodiment) It is a front view of a 1st correction part and a 2nd correction part. (First embodiment) It is a block diagram of a wavefront modulation control part. (First embodiment) It is a side view explaining the effect | action of a wavefront modulation control part. (First embodiment) It is a block diagram of an image display apparatus. (Second embodiment)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Modulated light output part 3 Wavefront modulation control part (2nd correction part)
4 scanning unit 5 transfer optical system 6 head mounting unit 7 body carrying unit 8 convex lens 9 convex lens 11 first detecting unit 12 second detecting unit 13 first correcting unit 14 third correcting unit 15 spot position detecting unit 16 direction determining unit ( Judgment part)
61 modulated light output control unit 100 diffusion detection unit H modulated light R light emitting unit

Claims (15)

A modulated light output unit that outputs light as modulated light modulated according to image information, a scanning unit that outputs modulated light output from the modulated light output unit as scanning light, and a subsequent stage of the scanning unit An image display device comprising a transfer optical system that is provided to guide the scanning light to an observer's pupil,
A head-mounted unit that is provided on at least a part of the transfer optical system of the scanning unit and the transfer optical system and is mounted on the head of an observer;
An image display device, comprising: the modulated light output unit; and at least the modulated light output unit of the scanning unit, and a body portable unit portable to an observer's body.   The image display apparatus according to claim 1, wherein the body portable unit includes a first correction unit capable of correcting an orientation of an optical axis of modulated light emitted from the body portable unit in the head mounting unit. .   The said body carrying part provided the 2nd correction | amendment part which can adjust the imaging position of scanning light to an optical axis direction according to the separation distance between the said head mounting part and a body carrying part. The image display apparatus according to claim 1 or 2.   A first detection unit configured to detect a direction in which the head mounting unit exists with respect to the body portable unit, wherein the first correction unit sets an optical axis of modulated light emitted from the body portable unit to the head The image display device according to claim 2, wherein the image display device is corrected so as to be directed in a direction in which the mounting portion exists. The first detection unit is provided in either the head-mounted unit or the body portable unit, and outputs an inspection light output unit that outputs inspection light;
A spot position detection unit including a position detection element provided on the other of the head mounting unit or the body portable unit and receiving the inspection light and outputting a signal corresponding to the center position of the light receiving spot; and the spot position detection The image display apparatus according to claim 4, further comprising: a determination unit that determines a direction of an optical axis of the inspection light based on a light spot position detected by the unit. The body portable unit includes the scanning unit, and the first correction unit is provided between the scanning unit of the body portable unit and the head mounting unit, and is in a plane perpendicular to the optical axis of the scanning unit. An optical element displaceable in
And a driving unit that displaces the optical element in accordance with the direction of the optical axis of the inspection light detected by the first detection unit, whereby the direction of the scanning light emitted from the body portable unit is changed to the head mounting unit. The image display device according to claim 5, wherein the image display device matches the direction of the image.   A second detection unit that obtains a distance between the body portable unit and the head-mounted unit, wherein the second correction unit is configured to modulate the modulated light according to a distance between the body portable unit and the head-mounted unit; The image display apparatus according to claim 3, wherein an image forming position by the control is controlled in an optical axis direction.   The second detection unit is provided in either the head mounting unit or the body portable unit, and outputs an inspection light output unit that outputs inspection light, and the other of the head mounting unit or the body portable unit. And a diffusion detection unit that detects a degree of diffusion of the inspection light, and obtains a distance between the head-mounted unit and the body portable unit based on the degree of diffusion of the inspection light. Item 8. The image display device according to Item 7.   The body portable unit includes the scanning unit, and the second correction unit controls the diffused light to converge or modulate the modulated light, so that the body portable unit is interposed between the scanning unit of the body portable unit and the head mounting unit. The image display apparatus according to claim 3, wherein the image forming position is controlled in the optical axis direction accordingly.   The image display apparatus according to claim 9, wherein the second correction unit includes a wavefront modulation control unit.   When the first detection unit or the second detection unit detects the presence of the head mounting unit mounted on the head of the observer, the modulated light output unit is activated, and the first detection unit or the first detection unit A modulated light output control unit that controls the modulated light output unit so as not to operate the modulated light output unit when the two detection units do not detect the presence of the head mounted unit mounted on the head of the observer The image display device according to claim 5, further comprising:   The image display device according to claim 1, wherein the transfer optical system includes one or a plurality of lenses.   The image display apparatus according to claim 1, wherein the transfer optical system includes a diffractive element.   The said head mounting part is provided with the 3rd correction | amendment part which can correct | amend direction of the optical axis of the modulated light which injected from the said body portable part, The any one of Claims 2 thru | or 13 characterized by the above-mentioned. The image display device described in 1. The body portable unit includes the scanning unit, and the third correction unit is provided between the scanning unit of the body portable unit and the head mounting unit, and is in a plane perpendicular to the optical axis of the scanning unit. An optical element displaceable in
A driving unit that displaces the optical element in accordance with the direction of the optical axis of the inspection light detected by the first detection unit, so that the direction of the scanning light emitted from the optical element matches the eye of the observer The image display apparatus according to claim 14, wherein:

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