Graphic display device

Abstract

To provide a graphic display device that has line-of-sight detection means mounted therein, but does not increase operational load during visual adjustment.SOLUTION: A display unit 100 of a graphic display device 10 comprises: a lens barrel 200; an IRED 210 mounted on an FPC 211 and a line-of-sight camera 220 mounted on an FPC 221, which are fixed to one end of the lens barrel 200; a lens unit 300 that is arranged on the other end of the lens barrel 200; and a cam ring 230 and an operating lever 240 that make the lens unit 300 movable relative to the lens barrel 200 independent of the lens barrel 200.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a video display device. [Background technology]

[0002] In recent years, head-mounted displays (HMDs) that are worn on the head of an operator and display images in front of the operator's eyes have been used as image display devices. Some HMDs are known to be equipped with a gaze detection function that detects the location the operator is observing. This gaze detection function is used to determine the operator's interpupillary distance, adjust the display lens position to an appropriate interpupillary distance, and output the operator's gaze log. Meanwhile, a diopter adjustment function technology is known that adjusts the diopter of the display by adjusting the distance between the display element and the lens in order to eliminate the discrepancy between the distance of the subject viewed by the operator and the diopter of the head-mounted display. For example, Patent Document 1 discloses a camera viewfinder device having a line of sight detection function and a diopter adjustment function. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-287273 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional technology disclosed in Patent Document 1, the diopter adjustment is performed by moving the display element (finder screen). Wiring must be connected to the display element. In this case, when moving the display element, the wiring must be moved as well, and the wiring acts as a resistance to the movement, increasing the movement load. This makes it difficult to perform a smooth diopter adjustment operation.

[0005] On the other hand, it is also possible to adjust the diopter by moving the lens. In this case, in order to achieve the line of sight detection function, it is necessary to place a light-projecting diode and a light-receiving camera facing the operator's eye, and it is required to place them close to the lens. For this reason, it is preferable to fix the diode and the camera to the lens, and as a result, the wiring connected to the diode and the camera is also connected to the lens, which creates a problem of resistance in the wiring when the lens is moved.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide an image display device that is equipped with a line-of-sight detection function but does not increase the operational load when adjusting visibility. [Means for solving the problem]

[0007] The image display device disclosed herein comprises a lens barrel, a line of sight detection means fixed to one end of the lens barrel and connected to a wiring, an optical element arranged at the other end of the lens barrel, and a moving means for moving the optical element relative to the lens barrel independently of the lens barrel. Effect of the Invention

[0008] According to the present disclosure, an image display device is realized that is equipped with a line-of-sight detection function but does not increase the operational load during visibility adjustment. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an image display device according to an embodiment. [Diagram 2] FIG. 1 is a perspective view of an image display device 10 according to a first embodiment, as viewed from an operator's side. [Diagram 3] 1 is a cross-sectional view taken along dashed line AA in FIG. [Figure 4] FIG. 1 is a front view of an image display device 10 according to a first embodiment as viewed from an operator's side. [Diagram 5] FIG. 2 is a schematic diagram showing a display unit for the left eye in the first embodiment. [Figure 6] FIG. 6 is an exploded perspective view of the display unit as seen from the direction of FIG. 5(a). [Figure 7] FIG. 2 is a front view of a display unit for the left eye in the first embodiment, as viewed from the operator's side. [Figure 8] FIG. 2 is a schematic diagram showing a cam ring and a lens unit according to the first embodiment. [Figure 9] FIG. 11 is a perspective view of a display unit for the left eye in the second embodiment, as viewed from the operator's side. [Figure 10] FIG. 11 is a block diagram showing a schematic configuration of a video display device according to a second embodiment. [Figure 11] 10 is a flowchart showing a visibility adjustment operation in the second embodiment. [Figure 12] FIG. 11 is a schematic diagram for explaining a convergence distance. [Figure 13] FIG. 11 is a block diagram showing a schematic configuration of a video display device 2000 according to a third embodiment. [Figure 14] 13 is a flowchart showing a visibility adjustment operation in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Basic Functions of the Image Display Device in Various Embodiments] Before specifically disclosing the various embodiments, basic functions of the image display device in each embodiment will be described.

[0011] The image display device according to the present disclosure includes a display element for displaying an image, a lens barrel, a visual line detection means fixed to one end of the lens barrel and connected to a wiring, an optical element arranged at the other end of the lens barrel, and a moving means for moving the optical element relative to the display element, separated from the lens barrel. In the present disclosure, the visual line detection means has, for example, a light projecting means for illuminating the operator's eye and a light receiving means for receiving light reflected by the eye, and wiring is connected to each of the light projecting means and the light receiving means. In this image display device, a so-called TTL (Through The Lens) method is adopted, in which the light projecting means projects light and the light receiving means receives light through an optical element. This realizes both an excellent visual line detection function and space saving of the image display device. The wiring is, for example, a wiring board, and the light projecting means and the light receiving means are respectively mounted on the wiring. A display element such as a display panel is fixed to, for example, one end of the lens barrel.

[0012] In the present disclosure, the line of sight detection means having wiring is fixed to one end of the lens barrel. An optical element having various lenses and the like is arranged at the other end of the lens barrel, and when performing diopter adjustment, the optical element is separated from the lens barrel by the moving means and moved, for example, in the optical axis direction relative to the display element. Since the optical element is separate from the lens barrel and only the optical element moves, unlike the conventional method, when the optical element moves, the line of sight detection means having wiring fixed to the lens barrel does not move. When performing diopter adjustment of the image display device, there are a method in which the display element is fixed and the optical element is moved relative to the display element, and a method in which the optical element is fixed and the display element is moved relative to the optical element. Since the latter method would mean moving the display element together with the wiring, the present disclosure employs the former method. In the conventional method, when the former method is adopted, the line of sight detection means to which the wiring is connected is fixed to the optical element, and a configuration is adopted in which the optical element is moved together with the wiring. In the present disclosure, when adjusting the diopter by fixing the display element and moving the optical element relative to the display element, the optical element moves independently, separated from the line of sight detection means having wiring and the lens barrel to which the display element is fixed. Therefore, there is no increase in the load of diopter adjustment due to the repulsive force of the wiring (particularly the wiring board) when the optical element moves, and smooth diopter adjustment is possible.

[0013] In the present disclosure, the moving means has a first member movably held relative to the lens barrel and a second member that moves the first member, and the optical element moves due to the movement of the first member. The first member is, for example, a cam member, and is engaged with the second member, and the first member rotates due to the linear movement of the second member. This causes the optical element to move straight in the optical axis direction.

[0014] The second member may be operated manually by an operator or automatically. In the case of a manual operation, the second member may be, for example, an operating lever operated by an operator. In this case, it is preferable to place the operating lever on the opposite side of the optical axis of the optical element from the light receiving means. By placing the operating lever in this way, the line of sight detection means can be mounted on the image display device in a space-saving manner while maintaining the operability of the operating lever.

[0015] When the operation is performed under automatic control, the second member is a driving member, such as a motor, that automatically drives the first member. In this case, a visual distance determination means that determines the visual distance of the operator from the calculation result of the visual line detection means may be provided, and the second member may be driven based on the determination result by the visual distance determination means to operate the first member. The visual distance determination means may determine the visual distance of the operator based on convergence distance information that is the calculation result of the visual line detection means, or may determine the visual distance of the operator based on distance information to the subject being gazed at. Furthermore, an imaging means that acquires a background image may be provided, and the imaging means may have a focus adjustment means that adjusts the focus based on the determination result by the visual distance determination means.

[0016] Hereinafter, preferred embodiments to which the present invention can be applied will be described in detail with reference to the drawings. In the following description, components common to multiple drawings are given common reference numerals. Therefore, the common components will be described with mutual reference to multiple drawings, and the description of the components given common reference numerals will be omitted as appropriate.

[0017] [First embodiment] Hereinafter, the first embodiment will be described in detail with reference to the accompanying drawings.

[0018] FIG. 1 is a perspective view showing an image display device according to the present embodiment. The image display device 10 is a so-called head mounted display (HMD). The operator can observe an image by wearing the image display device 10 on his / her head. The image display device 10 includes imaging cameras 20L, 20R and alignment cameras 21L, 21R. The imaging cameras 20L, 20R are stereo cameras that acquire a real image of the surroundings to be displayed to the operator through lenses 150, 151 (described later). The alignment cameras 21L, 21R are stereo cameras for acquiring the position and attitude of the image display device 10 by using feature points such as markers and edges of objects from the acquired image. In this embodiment, the imaging cameras 20L, 20R and the alignment cameras 21L, 21R are provided separately. The alignment cameras 21L, 21R are monochrome images, and aim to achieve high-precision and high-fault-tolerance alignment by utilizing a wide angle of view, a high shutter speed, a long baseline length, and the like. It is also possible to acquire the display image and the alignment information only by the imaging cameras 20L and 20R, without providing the alignment cameras 21L and 21R. Also, the alignment cameras 21L and 21R may be replaced with distance sensors using ultrasonic waves, infrared rays, or the like.

[0019] FIG. 2 is a perspective view of the image display device 10 according to this embodiment as seen from the operator's side. The image display device 10 has display units 100L, 100R on the left and right, and an operator looks into the display units 100L, 100R to observe images. Hoods 11L, 11R are provided around the display units 100L, 100R, and the operator can adjust the left and right positions of the display units 100L, 100R to match the operator's interpupillary distance by operating the hoods 11L, 11R.

[0020] FIG. 3 is a cross-sectional view taken along the dashed line AA in FIG. The configuration of the left and right display units 100L, 100R will be described with reference to Fig. 3. In the figure, parts that are not necessary for the description are omitted. Since the display unit 100L for the left eye and the display unit for the right eye have the same configuration, the display unit for the right eye is omitted from the illustration, and the following description will be given by taking the display unit 100L for the left eye as an example.

[0021] In the display unit 100L, the original image displayed on the display element 120L is enlarged and projected as a virtual image and guided to the operator's eye 110L. The display unit 100L has an optical system that folds the optical path by using polarized light.

[0022] As shown in Fig. 3, a polarizing plate 130L and a first phase plate 140L are disposed between the display element 120L and the lens 150L in this order from the display element 120L side, and a half mirror 160L is formed by vapor deposition on the surface of the lens 150L facing the lens 151L. The surface on which the half mirror 160L is formed acts as a semi-transmissive reflective surface. In this embodiment, the polarizing plate 130L and the first phase plate 140L are integrated and fixed to the lens barrel 200L.

[0023] Between the lens 151L and the operator's eye 110L, the second phase plate 141L and the PBS 170L of the polarization separation element are arranged in order from the display element 120L side. The second phase plate 141L and the PBS 170L are planar. The first phase plate 140L and the second phase plate 141L are wave plates with a phase difference of λ / 4. The second phase plate 141L is held in contact with the lens 151L. In this embodiment, the second phase plate 141L and the PBS 170L are integrated and attached on the lens 150L. The lenses 150L and 151L are joined and fixed to the holder 310L.

[0024] Here, the polarization direction of the light passing through the polarizing plate 130L is inclined at 45° to the slow axis of the first phase plate 140L, and the polarization direction of the light passing through the PBS 170L is inclined at 45° to the slow axis of the second phase plate 141L. In addition, the polarization direction of the light passing through the polarizing plate 130L is perpendicular to the polarization direction of the light passing through the PBS 170L.

[0025] In this configuration, the light emitted from the display element 120L becomes linearly polarized light by passing through the polarizing plate 130L, and becomes circularly polarized light by passing through the first phase plate 140L. This light passes through the half mirror 160L and the second phase plate 141L to become linearly polarized light (first linearly polarized light). Since the polarization direction of this linearly polarized light is perpendicular to the polarization direction of the light passing through the PBS 170L, the light reflected by the PBS 170L and passing through the second phase plate 141L becomes circularly polarized light. The light reflected by the half mirror 160L and passing through the second phase plate 141L becomes linearly polarized light (second linearly polarized light). The polarization direction of this linearly polarized light is different from the above and coincides with the polarization direction of the light passing through the PBS 170L. Therefore, the second linearly polarized light passes through the PBS 170L and is guided to the operator's eye 110L. The eye 110L of the operator is approximately aligned with the exit pupil of the display unit 100L. In this way, by using polarized light to fold the optical path, the display units 100L and 100R can be made thin and have a short focal length, enabling wide-angle image observation.

[0026] FIG. 4 is a front view of the image display device 10 according to this embodiment as seen from the operator's side. Infrared light emitting diodes (hereinafter referred to as IREDs (Infrared-Emitting Diodes)) 210L, 210R and light receiving gaze cameras 220L, 220R are provided on the rear side of display units 100L, 100R as seen from an operator. In image display device 10, a gaze detection means is configured by having IRED 210L (210R) which is a light projecting means and gaze camera 220L (220R) which is a light receiving means.

[0027] The left eye gaze camera 220L is disposed at approximately the 3 o'clock position around the optical axis of the left eye display unit 100L. A plurality of IREDs 210L are disposed around the optical axis avoiding the 3 o'clock position. The right eye gaze camera 220R is disposed at approximately the 9 o'clock position around the optical axis of the right eye display unit 100R. A plurality of IREDs 210R are disposed around the optical axis avoiding the 9 o'clock position. The left and right gaze cameras 220L, 220R are disposed symmetrically and facing each display unit 100L, 100R.

[0028] The infrared light emitted from the IREDs 210L and 210R illuminates the eye of the operator 110, in this case the cornea, and the light reflected from the cornea is received by the gaze cameras 220L and 220R for receiving the light. The projected and received light passes through the lenses 150L and 150R and the lenses 151L and 151R, achieving both the realization of the gaze detection function and space saving. The images obtained by the gaze cameras 220L and 220R are sent to a control unit (not shown), and the pupil position can be detected by image analysis. The detected pupil position information can be used to input the gaze or obtain a gaze log.

[0029] An operating lever 240L is disposed at the 9 o'clock position of the left eye side hood 11L, and an operating lever 240R is disposed at the 3 o'clock position of the right eye side hood 11R. That is, the operating levers 240L, 240R are disposed on the opposite side of the gaze cameras 220L, 220R, centered on the optical axis of each display unit 100L, 100R. This arrangement allows the gaze detection function to be implemented in a small space while maintaining the operability of the operating levers 240L, 240R.

[0030] Fig. 5 is a schematic diagram showing a display unit 100L for the left eye in this embodiment, where (a) is a perspective view seen from the operator side, and (b) is a perspective view seen from the front side of the image display device 10. Fig. 6 is an exploded perspective view of the display unit 100L seen from the direction of Fig. 5(a). In Figs. 5 and 6, some components are not shown for the sake of explanation. The display unit for the right eye has the same configuration as the display unit 100L for the left eye, so it is not shown in the drawings, and only the display unit 100L for the left eye will be described below as an example.

[0031] A display element 120L, a flexible printed circuit (FPC) 211L on which an IRED 210L is mounted, and an FPC 221L on which an eye camera 220L is mounted are fixed to the lens barrel 200L. The display element 120L is integrated with an FPC 121L for drawing out wiring. The FPCs 221L, 211L, and 121L are connected by wiring to a control unit (not shown) via an intermediate board (not shown). Before the display element 120L is adhesively fixed to the lens barrel 200L, the position of the display element 120L relative to the lens barrel 200L is adjusted with an adjustment tool (not shown), so that the display element 120L is positioned with high precision relative to the lens barrel 200L.

[0032] The lens barrel 200L is held by a hook (not shown) so as to be slidable in the left-right direction relative to the rear cover 30, and the left-right position can be adjusted to match the interpupillary distance of the operator. A space 203L is formed in the center of the lens barrel 200L to accommodate a lens unit 300L (described later), and a cam ring 230L, which is a cam member, is attached in this space 203L so as to be rotatable relative to the lens barrel 200L. A hole 201L is formed in the lens barrel 200L, and a bar 250L is fixed to the lens barrel 200L while being inserted into the hole 201L. The bar 250L is inserted into the operating lever 240L, and is held so as to be movable linearly in the longitudinal direction of the bar 250L relative to the lens barrel 200L.

[0033] The lens unit 300L, which is an optical element, is provided in the space 203L that houses the lens unit 300L. The lens unit 300L includes a holder 310L, lenses 150L and 151L, a second phase plate 141L attached to the lens 151, and a PBS 170L. The lens unit 300L is not provided with any wiring that is connected to a control unit.

[0034] The lenses 150L and 151L in the joined state are adhesively fixed to the holder 310L. Here, an adhesive is exemplified as a means for fixing the lenses, but the outer periphery of the lens 150L or the lens 151L may be partially interfered with the inner diameter of the holder 310L and press-fitted. Three keys 311L are provided at approximately equal intervals on the outer periphery of the holder 310L. Meanwhile, three grooves 202L are also provided at equal intervals on the lens barrel 200L, and the keys 311L fit into the grooves 202L to restrict the movement of the lens unit 300L in the rotational direction relative to the lens barrel 200L.

[0035] Next, the actual operation of the left eye display unit 100L will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a front view of the left eye display unit 100L in this embodiment as seen from the operator's side, (a) shows a state in which the diopter is adjusted to a long distance, and (b) shows a state in which the diopter is adjusted to a close distance. Fig. 8 is a schematic diagram showing the cam ring 230L and the lens unit 300L in this embodiment, (a) shows a cross section of the cam ring 230L, and (b) shows a side view of the lens unit 300L.

[0036] The operating lever 240L has a click mechanism (not shown) and is held at the upper and lower end positions of the operating lever 240L. As shown in Figures 7(a) and (b), the operating lever 240L and the cam ring 230L engage with each other at engagement portions 241L and 231L formed thereon, and the cam ring 230L rotates in response to the up and down movement of the operating lever.

[0037] As shown in Fig. 8(a), cams 232L are formed on the inner circumference of cam ring 230L. Although two cams 232L are shown in the figure, three cams 232L are provided at approximately equal intervals around the entire circumference. Meanwhile, as shown in Fig. 8(b), cam grooves 312L are formed on the outer circumference of holder 310L. The cam grooves 312L are also provided at three locations at approximately equal intervals around the entire circumference. When lens unit 300L is incorporated into display unit 100L, cam 232L engages with cam groove 312L.

[0038] When the operating lever 240L is in the upper position as shown in Fig. 7(a), the cam 232L engages with the β zone of the cam groove 312L as shown in Fig. 8(b), and the diopter is adjusted to the long distance side. When the operating lever 240L is moved downward from this state, the cam ring 230L rotates and is guided by the cam 232L of the cam ring 230L, and begins to engage with the α zone of the cam groove 312L, and the lens unit 300L moves toward the display element 120L. This reduces the distance between the display element 120L and the lens, resulting in the state shown in Fig. 7(b), and the diopter is adjusted to the short distance side.

[0039] In the state where the operating lever 240L is on the lower side as shown in FIG. 7(b), the cam 232L fits into the α zone of the cam groove 312L as shown in FIG. 8(b), and the diopter is adjusted to the near side. When the operating lever 240L is moved upward from this state, the cam ring 230L rotates, is guided by the cam 232L of the cam ring 230L, and starts to fit into the β zone of the cam groove 312L. The lens unit 300L moves toward the operator's eye 110L. This increases the distance between the display element 120L and the lens, resulting in the state shown in FIG. 7(a), and the diopter is adjusted to the far side. The key 311L fits into the groove 202L, and thus the movement of the lens unit 300L in the rotational direction relative to the lens barrel 200L is restricted, so that the lens unit 300L can move straight without rotating.

[0040] In this embodiment, the FPC 211L on which the IRED 210L is mounted, the FPC 221 on which the gaze camera 220L is mounted, and the display element 120L integrated with the FPC 121L for drawing out wiring are fixed to one end of the lens barrel 200L. The lens unit 300L is disposed at the other end of the lens barrel 200L, and when performing diopter adjustment, it is movable in the optical axis direction separately and independently from the lens barrel 200L. With the above configuration, when the lens unit 300L moves straight by operating the operating lever 240L, the lens unit 300L moves separately from the lens barrel 200L. The FPC 211L on which the IRED 210L is mounted and the FPC 221 on which the gaze camera 220L is mounted are fixed to the lens barrel 200L, not to the lens unit 300L. Therefore, when moving the lens unit 300L, the load of the diopter adjustment operation due to the repulsive force of the FPC does not increase, and smooth operation is possible.

[0041] Although the above description has been given taking the display unit 100L for the left eye as an example, this embodiment can also be applied to the display unit 100R for the right eye in the same manner.

[0042] As described above, according to this embodiment, an image display device is realized that includes a line-of-sight detection means but does not increase the operational load during visibility adjustment.

[0043] [Second embodiment] The second embodiment will be described in detail below with reference to the accompanying drawings. In this embodiment, detailed descriptions of components similar to those in the first embodiment will be omitted, and the same reference numerals as those in the first embodiment will be used.

[0044] 9 is a perspective view of the left-eye display unit 1000L in this embodiment as seen from the operator's side. In this figure, some components are not shown for the sake of explanation. The right-eye display unit has a similar configuration, so it is not shown. In the following, only the left-eye display unit 1000L will be described as an example.

[0045] A hole 1201L is formed in the lens barrel 1200L, and the bar 250L is inserted and fixed to the lens barrel 1200L. The bar 250L is inserted into the lever 1240L, and the lever 1240L is held so as to be movable linearly in the longitudinal direction of the bar 250L.

[0046] The motor 1260L has a rotating shaft 1261L that is threaded like a screw, and a nut portion formed on the lever 1240L is screwed onto the rotating shaft 1261L. The motor 1260L is fixed to a holder 1270L, and the holder 1270L is fixed to the lens barrel 1200L. The other configurations are the same as those of the first embodiment shown in FIG.

[0047] 10 is a block diagram showing a schematic configuration of the image display device 1000 in this embodiment. In the figure, only the display unit 1100L for the left eye is shown, and the display unit for the right eye is omitted because it has a similar configuration. In addition, the imaging cameras 20L, 20R and the alignment cameras 21L, 21R shown in the first embodiment are not shown because they are not necessary for explanation.

[0048] The image display device 1000 includes a display unit 1100L, a control unit 1010 that handles various controls, a viewing distance determination means 1020 that is part of the control unit 1010, and a power source 1030. Here, an example is shown in which the power source 1030 is built into the image display device 1000, but the image display device 1000 may not have an internal power source and may be connected to an external power source via a cable.

[0049] Fig. 11 is a flowchart showing the visibility adjustment operation in this embodiment. Fig. 12 is a schematic diagram for explaining the convergence distance. Hereinafter, the visibility adjustment operation will be described in detail with reference to the flowchart shown in FIG.

[0050] (Step S101) When the operator looks into the display unit 1100L, the IRED 210L irradiates the infrared light onto the operator's cornea, and the gaze camera 220L receives the infrared light emitted from the IRED 210L reflected by the cornea. The gaze distance determination means 1020 calculates the convergence distance (visual distance L1) between the left and right eyes based on the data of the infrared light received by the gaze camera 220L. Then, the process proceeds to S102. The convergence distance is the distance from the operator's eyes 110L and 110R to the subject 1300 being observed, that is, the visual distance L1, as shown in FIG. 12, and is a value calculated from the angular difference between the left and right gaze directions.

[0051] (Step S102) The visual distance determination means 1020 determines whether the visual distance L1 is closer than a predetermined threshold value. If it is determined that the visual distance L1 is closer than the threshold value, the process proceeds to S103, and if it is determined that it is farther, the process proceeds to S108.

[0052] (Step S103) The visual distance determination means 1020 determines whether the current diopter adjustment is set to a long distance or not. If it is determined that the diopter adjustment is set to a long distance, the process proceeds to S104, and if it is determined that the diopter adjustment is set to a short distance, the diopter adjustment operation ends.

[0053] (Step S104) The control unit 1010 drives the motor 1260L so that the diopter adjustment is adjusted to the near distance side. Then, the process proceeds to S105.

[0054] (Step S105) The motor 1260L drives and rotates the cam ring 230L under the drive control of the control unit 1010. Then, the process proceeds to S106.

[0055] (Step S106) In S105, the motor 1260L rotates the cam ring 230L, so that the lens unit 300L (lenses 150L and 151L in the example of FIG. 10) moves to the display element 120L side. Then, the process proceeds to S107.

[0056] (Step S107) The motor 1260L transmits a signal to the control unit 1010 indicating that the diopter has been adjusted to the near side, and the diopter adjustment operation ends.

[0057] (Step S108) In S102, if it is determined that the viewing distance L1 is farther than the predetermined threshold, the viewing distance determination means 1020 determines whether the current diopter adjustment is set to a short distance or not. If it is determined that the diopter adjustment is set to a short distance, the process proceeds to S109, and if it is determined that the diopter adjustment is set to a long distance, the diopter adjustment operation ends.

[0058] (Step S109) The control unit 1010 drives the motor 1260L so that the diopter adjustment is adjusted to the long distance side. Then, the process proceeds to S110.

[0059] (Step S110) The motor 1260L drives and rotates the cam ring 230L under the drive control of the control unit 1010. Then, the process proceeds to S111.

[0060] (Step S111) The motor 1260L rotates the cam ring 230L in S110, so that the lens unit 300L moves to the side of the operator's eye 110L. Then, the process proceeds to S112.

[0061] (Step S112) The motor 1260L transmits a signal to the control unit 1010 indicating that the diopter has been adjusted to the long distance side, and the diopter adjustment operation ends.

[0062] In this embodiment, the FPC 211L on which the IRED 210L is mounted, the FPC 221 on which the gaze camera 220L is mounted, and the display element 120L integrated with the FPC 121L for drawing out wiring are fixed to one end of the lens barrel 200L. The lens unit 300L is disposed at the other end of the lens barrel 200L, and is movable in the optical axis direction separately and independently from the lens barrel 200L when adjusting the diopter. With the above configuration, when the lens unit 300L moves linearly due to the rotational operation of the motor 1260L, the lens unit 300L moves separately from the lens barrel 200L. The FPC 211L on which the IRED 210L is mounted and the FPC 221 on which the gaze camera 220L is mounted are fixed to the lens barrel 200L, not the lens unit 300L. Therefore, when moving the lens unit 300L, the load of the diopter adjustment operation due to the repulsive force of the FPC does not increase, and smooth operation is possible.

[0063] In the above, in this embodiment, the visual distance L1 is determined based on the convergence distance, but the visual distance may be determined using other means, such as determining the distance to the object being watched and determining the visual distance based on the distance information, without being limited to the convergence distance. Also, the diopter adjustment has been described as switching between two points, close and far, but this embodiment can be applied even when the visual adjustment is configured to be performed at three or more points including the two points, without being limited to two points.

[0064] [Third embodiment] Hereinafter, the third embodiment will be described in detail with reference to the accompanying drawings. In this embodiment, detailed descriptions of components similar to those in the first and second embodiments will be omitted, and the same reference numerals as those in the first and second embodiments will be used.

[0065] 13 is a block diagram showing a schematic configuration of the image display device 2000 in this embodiment. In the figure, the display unit 2100L and the imaging camera 2200L for acquiring the background image display only for the left eye, and the display unit for the right eye is similar in configuration and therefore is not shown. Also, the alignment cameras 21L and 21R shown in the first embodiment are not shown because they are not necessary for explanation.

[0066] The imaging camera 2200L is mainly configured to have a focus motor 2210L, a lens 2220L, and an imaging sensor 2230L. The lens 2220L is moved by driving the focus motor 2210L, and focus adjustment is performed. The configuration of the display unit 2100L is similar to that of the display unit 1100L in the second embodiment.

[0067] 14 is a flowchart showing the visibility adjustment operation in this embodiment. The visibility adjustment operation will be described in detail with reference to the flowchart shown in FIG.

[0068] (Step S201) When the operator looks into the display unit 2100L, the IRED 210L irradiates the cornea of ​​the operator with infrared light, and the gaze camera 220L receives the infrared light emitted from the IRED 210L reflected by the cornea. The gaze distance determination means 1020 calculates the convergence distance (visual distance L1) between the left and right eyes based on the data of the infrared light received by the gaze camera 220L. Then, the process proceeds to S202.

[0069] (Step S202) The visual distance determination means 2020 determines whether the visual distance L1 is closer than a predetermined threshold value. If it is determined that the visual distance L1 is closer than the threshold value, the process proceeds to S203, and if it is determined that it is farther, the process proceeds to S210.

[0070] (Step S203) The visual distance determination means 2020 determines whether the current diopter adjustment is set to a long distance or not. If the diopter adjustment is determined to be a long distance, the process proceeds to S204, and if the diopter adjustment is determined to be a short distance, the diopter adjustment operation ends.

[0071] (Step S204) The control unit 2010 drives the motor 1260L so that the diopter adjustment is adjusted to the near distance side. Then, the process proceeds to S205.

[0072] (Step S205) The motor 1260L drives and rotates the cam ring 230L under the drive control of the control unit 2010. Then, the process proceeds to S206.

[0073] (Step S206) In S206, the motor 1260L drives and rotates the cam ring 230L, so that the lens unit 300L (lenses 150L and 151L in the example of FIG. 13) moves to the display element 120L side. Then, the process proceeds to S207.

[0074] (Step S207) The motor 1260L transmits a signal to the control unit 2010 indicating that the diopter has been adjusted to the near side. Then, the process proceeds to S208.

[0075] (Step S208) The control unit 1010 drives the focus motor 2210L to move the lens 2220L toward the image sensor 2230L. Then, the process proceeds to S209.

[0076] (Step S209) The focus motor 2210L transmits to the control unit 2010 a signal indicating that the imaging focus position has been adjusted to a close distance, and the diopter adjustment operation ends.

[0077] (Step S210) In S202, if it is determined that the viewing distance L1 is farther than the predetermined threshold, the viewing distance determination means 2020 determines whether the current diopter adjustment is set to a short distance or not. If it is determined that the diopter adjustment is a short distance, the process proceeds to S211, and if it is determined that the diopter adjustment is a long distance, the diopter adjustment operation ends.

[0078] (Step S211) The control unit 2010 drives the motor 1260L so that the diopter adjustment is adjusted to the far distance side. Then, the process proceeds to S212.

[0079] (Step S212) The motor 1260L drives and rotates the cam ring 230L under the drive control of the control unit 2010. Then, the process proceeds to S213.

[0080] (Step S213) In S212, the motor 1260L rotates the cam ring 230L, so that the lens unit 300L moves to the side of the operator's eye 110L. Then, the process proceeds to S214.

[0081] (Step S214) The motor 1260L drives and rotates the cam ring 230L under the drive control of the control unit 2010. Then, the process proceeds to S215.

[0082] (Step S215) In step S214, the motor 1260L rotates the cam ring 230L, so that the lens 2220L moves to the subject side. Then, the process proceeds to step S216.

[0083] (Step S216) The motor 1260L transmits a signal to the control unit 2010 indicating that the diopter has been adjusted to the long distance side, and the diopter adjustment operation ends.

[0084] In this embodiment, the FPC 211L on which the IRED 210L is mounted, the FPC 221 on which the gaze camera 220L is mounted, and the display element 120L integrated with the FPC 121L for drawing out wiring are fixed to one end of the lens barrel 200L. The lens unit 300L is disposed at the other end of the lens barrel 200L, and is movable in the optical axis direction separately and independently from the lens barrel 200L when adjusting the diopter. With the above configuration, when the lens unit 300L moves linearly due to the rotational operation of the motor 1260L, the lens unit 300L moves separately from the lens barrel 200L. The FPC 211L on which the IRED 210L is mounted and the FPC 221 on which the gaze camera 220L is mounted are fixed to the lens barrel 200L, not the lens unit 300L. Therefore, when moving the lens unit 300L, the load of the diopter adjustment operation due to the repulsive force of the FPC does not increase, and smooth operation is possible.

[0085] In the above, in this embodiment, the diopter adjustment and the image focus position adjustment have been described by switching between two points, close and far, but this is not limited to this. This embodiment can also be applied when the diopter adjustment and the image focus position adjustment are configured to be performed at three or more points including the two points, not limited to two points. In addition, the diopter adjustment has been described as being linked only to the focus adjustment of the image capture camera, but the focus adjustment of the positioning camera may also be linked. The present disclosure is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present disclosure.

[0086] The disclosure of various embodiments includes the following configurations. (Configuration 1) A display element for displaying an image; The telescope tube, A line of sight detection means fixed to one end of the lens barrel and connected to a wiring; an optical element disposed at the other end of the barrel; a moving means for moving the optical element relative to the display element, the moving means being separated from the lens barrel; A video display device comprising: (Configuration 2) The moving means is A first member movably held relative to the lens barrel; A second member that operates the first member; It has The optical element is moved by the operation of the first member. 2. The image display device according to claim 1. (Configuration 3) the first member is a cam member and is engaged with the second member; The first member rotates in response to linear movement of the second member. 3. The image display device according to configuration 2. (Configuration 4) The line of sight detection means is A light projecting means for illuminating the eye of an operator; A light receiving means for receiving light reflected by the eye portion; having 2. The image display device according to claim 1. (Configuration 5) The light projected by the light projecting means and the light received by the light receiving means are performed through the optical element. 5. The image display device according to configuration 4. (Configuration 6) The optical element moves in the optical axis direction of the optical element. 6. The image display device according to any one of configurations 1 to 5. (Configuration 7) The wiring is a wiring board, and the line of sight detection means is mounted on the wiring. The image display device according to any one of configurations 1 to 6. (Configuration 8) The display element is fixed to the one end of the lens barrel. The image display device according to any one of configurations 1 to 7. (Configuration 9) The second member is an operating lever operated by an operator. 6. The image display device according to any one of configurations 2 to 5. (Configuration 10) the operating lever is disposed on the opposite side of the optical axis of the optical element from the light receiving means of the line of sight detection means, 10. The image display device according to configuration 9. (Configuration 11) The second member is a driving member that automatically drives the first member. 6. The image display device according to claim 2. (Configuration 12) a visual distance determination means for determining a visual distance of an operator from a calculation result of the visual line detection means, The second member is driven based on a result of the determination by the visual distance determination means to operate the first member. 12. The image display device according to configuration 11. (Configuration 13) The visual distance determination means determines the visual distance of the operator based on convergence distance information which is a calculation result of the visual line detection means. 13. The image display device according to configuration 12. (Configuration 14) the visual distance determination means determines the visual distance of the operator based on distance information to a subject being gazed at; 13. The image display device according to configuration 12. (Configuration 15) The device is provided with an imaging means for acquiring a background image, The imaging means has a focus adjustment means for adjusting a focus based on a result of the determination by the visual distance determination means. 15. The image display device according to any one of configurations 12 to 14. (Configuration 16) The cameras are provided to correspond to the left and right eyes of the operator, 16. The image display device according to any one of configurations 1 to 15. [Explanation of symbols]

[0087] 10: Video display device 100: Display unit 110: Operator's Eyes 120: Display element 150: Lens 151: Lens 200: Telescope tube 210: Infrared Emitting Diode (IRED) 211, 221: FPC 220: Line of Sight Camera 230: Cam ring 240: Operating lever 300: Lens unit 310: Holder 1010,2020:Control unit 1020,2020: Visual distance determination means 1260:Motor 2100: Display unit 2200: Imaging unit

Claims

1. A display element for displaying an image; The telescope tube, A line of sight detection means fixed to one end of the lens barrel and connected to a wiring; an optical element disposed at the other end of the barrel; a moving means for moving the optical element relative to the display element, the moving means being separated from the lens barrel; A video display device comprising:

2. The moving means is a first member movably held relative to the lens barrel; A second member that operates the first member; It has The optical element is moved by the operation of the first member.

2. The image display device according to claim 1.

3. the first member is a cam member and is engaged with the second member; The first member rotates in response to a linear movement of the second member.

3. The image display device according to claim 2.

4. The line of sight detection means is A light projecting means for illuminating the eye of an operator; A light receiving means for receiving light reflected by the eye portion; having 2. The image display device according to claim 1.

5. The light projected by the light projecting means and the light received by the light receiving means are performed through the optical element.

5. The image display device according to claim 4.

6. The optical element moves in the optical axis direction of the optical element.

2. The image display device according to claim 1.

7. The wiring is a wiring board, and the line of sight detection means is mounted on the wiring board.

2. The image display device according to claim 1.

8. The display element is fixed to the one end of the lens barrel.

2. The image display device according to claim 1.

9. The second member is an operating lever operated by an operator.

3. The image display device according to claim 2.

10. The operating lever is disposed on the opposite side of the light receiving means of the line of sight detection means across the optical axis of the optical element.

10. The image display device according to claim 9.

11. The second member is a driving member that automatically drives the first member.

3. The image display device according to claim 2.

12. a visual distance determination means for determining a visual distance of an operator from a calculation result of the visual line detection means, The second member is driven based on a result of the determination by the visual distance determination means to operate the first member. The image display device according to claim 11.

13. The visual distance determination means determines the visual distance of the operator based on convergence distance information which is a calculation result of the visual line detection means. The image display device according to claim 12.

14. the visual distance determination means determines the visual distance of the operator based on distance information to a subject being gazed at; The image display device according to claim 12.

15. The device is provided with an imaging means for acquiring a background image, The imaging means has a focus adjustment means for adjusting a focus based on a result of the determination by the visual distance determination means. The image display device according to claim 12.

16. The cameras are provided to correspond to the left and right eyes of the operator, The image display device according to any one of claims 1 to 15.

Images