JP2007133095A - Display device and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device capable of efficiently using light emitted from a light source, then reducing the manufacturing cost thereof, and to provide a method of manufacturing the display device. <P>SOLUTION: Since an HMD 20 has a constitution where the light beams 23 emitted from respective LEDs 31 are converted into a plurality of collimated light beams by a lens array 24, and the light-guided area of each collimated light beam is made smaller than the exit area from the LED 31, light loss is suppressed to the utmost, even if the plurality of light beams are condensed through a first condensing lens 33, and the light beams condensed through the first condensing lens 33 is scanned by a scanning part 28, then converted into collimated light beams through an eyepiece 23, and guided to an operator's eyes 22. According to this constitution, the light beams 23 from the LEDs 31 are used efficiently, and image information, obtained by scanning with the light beams from the LEDs 31, is displayed facing the operator's eyes 22. Thus, with a simple modification on the constitution, that is, by additionally installing only a lens array 24 in the conventional technology, the HMD 20 is realized, and increase in the manufacturing cost is suppressed to the utmost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device that is worn by an operator and displays image information on a display target, and a manufacturing method thereof.

  In the present invention, the term “rotation” includes an angular displacement of less than 360 degrees and a rotation of 360 degrees or more.

A head-mounted display (Head) that is worn on the operator's head and displays images to the operator
A technology related to Mounted Display (abbreviation HMD) has been proposed. FIG. 12 is a front view showing the HMD 1 of the first conventional technique in a simplified manner. As shown in FIG. 12, the HMD 1 is a display device that displays a two-dimensional image as an aerial image via an eyepiece optical system. The HMD 1 includes a light source 3 that emits a light beam 2, a condensing optical system 4 that condenses the emitted light beam 2, a scanning optical system 5 that scans the condensed light beam 2, and light to be scanned. A lens array 6 that focuses the beam 2 and forms an image of the light source, and an eyepiece optical that guides a two-dimensional image formed by the lens array 6 to the position of the operator's eye 8 as an aerial image System 7. Therefore, the operator can observe the aerial image through the eyepiece optical system 7 (see Patent Document 1).

  FIG. 13 is a simplified front view showing the HMD 10 of the second prior art. As shown in FIG. 13, the HMD 10 includes a light source 12 that emits a light beam 11, a condensing optical system 13 that condenses the light beam 11 from the light source 12 to form a condensing beam, and a condensing optical system 13. And a scanning optical system 14 provided in the vicinity of the focal point. The light beam 11 from the scanning optical system 14 is incident on the operator's eye 16 through the eyepiece optical system 15, and an image of the light source 12 is formed on the retina. When the light beam 11 is scanned by the scanning optical system 14, the image of the light source 12 is configured to scan the retina, and the operator can observe a two-dimensional image (see Patent Document 2).

JP 2003-29197 A US Pat. No. 5,701,132

  As in the first conventional technique, in an apparatus that forms an aerial image using a lens array in the middle of a light guide path, the amount of light per pixel depends on the lens size of the microlens constituting the lens array. . Therefore, if the lens size is reduced in order to achieve high definition, there is a problem that the light use efficiency is lowered.

  As in the second prior art, an apparatus that directly forms a light beam on the retina of the operator uses a green laser in consideration of the eyes of the operator. Since such a green laser has poor responsiveness, it is difficult to form a high-definition image, and since it is difficult to obtain a green laser, there is a problem that the manufacturing cost is high. Further, since the HMD is an optical system suitable for a laser light source, there is a problem that the light use efficiency is poor when a light emitting diode is used as the light source.

  In addition, in the HMD using diffused light as a light source, if the light is condensed to be smaller than the size of the light source using an optical system such as a lens, there is a problem in that an image to be displayed becomes dark because the use efficiency of light from the light source decreases. Further, even if a light source is provided with a stop so as to be a point light source from the beginning, there is a problem that the use efficiency of light decreases due to the influence of the stop and the image becomes dark.

  Accordingly, an object of the present invention is to provide a display device that can efficiently use light from a light source and can reduce the manufacturing cost, and a manufacturing method thereof.

The present invention is a display device that is attached to a part of an operator and displays image information,
A light source;
A first light guide means for converting light emitted from the light source into a plurality of parallel lights, and a light guide area of each parallel light being smaller than an emission area from the light source;
A second light guide means for condensing a plurality of lights from the first light guide means,
Scanning means for scanning light from the second light guiding means;
A display device comprising: a third light guide unit that converts light scanned by the scanning unit into parallel light and guides the light to a display target.

  In the invention, it is preferable that the scanning unit includes a reflection unit that can be angularly displaced around two orthogonal rotation axes.

  Furthermore, the present invention is characterized in that the reflecting means includes a galvanometer mirror that is angularly displaceable about a predetermined first rotation axis and is angularly displaceable about a second rotation axis that is orthogonal to the first rotation axis.

  Furthermore, the present invention is characterized in that it includes a diaphragm unit that is provided at the focal point of the light guided from the second light guide unit and transmits the light from the second light guide unit.

  Furthermore, the present invention is characterized by including a control means for controlling the intensity of light emitted from the light source.

Furthermore, the invention is characterized in that the light source is a light emitting diode.
Furthermore, the present invention is characterized in that the light source includes a plurality of light emitting diodes.

  Furthermore, the invention is characterized in that each light emitted from the plurality of light emitting diodes has at least one color of red, blue and green.

  Furthermore, the present invention is characterized in that the light emitting diode is mounted on the substrate by a flip chip bonding method.

Furthermore, the invention is characterized in that the diaphragm means is formed by irradiating a precursor of the diaphragm means provided on the glass substrate with laser light.
Furthermore, the invention is characterized in that the aperture means is formed using a non-reflective material.

Furthermore, the present invention is characterized in that the third light guide means includes a half mirror.
Furthermore, the present invention is characterized in that the third light guide means includes an aspheric eccentric mirror.
Furthermore, the present invention is characterized in that the third light guide means includes an aspheric eccentric prism.

Furthermore, the present invention is a method of manufacturing a diaphragm means that is mounted on a part of an operator and arranged in the middle of an optical path of a display device that displays image information,
A first step of integrating the condensing means for condensing the light emitted from the light source and converted into a plurality of parallel lights, and the precursor of the diaphragm means;
And a second step of irradiating the precursor with collimated ultraviolet light through the light condensing means.

  According to the present invention, the light emitted from the light source is converted into a plurality of parallel lights by the first light guide means, and the light guide region of each parallel light is made smaller than the light emission region from the light source. Accordingly, each of the parallel lights is regarded as a plurality of point light sources, and the plurality of lights are condensed by the second light guide unit. Therefore, even if the light from the light source is collected to be smaller than the emission region of the light source by the second light collecting means, the light loss can be suppressed as much as possible. The light condensed by the second light guide means is scanned by the scanning means, converted into parallel light by the third light guide means, and guided to the display object. Accordingly, it is possible to display the image information obtained by scanning the light from the light source on the display target by efficiently using the light from the light source. As a result, the present invention can be realized with a simple configuration change by simply adding the first light guide means to the conventional technique, and an increase in manufacturing cost can be suppressed as much as possible.

  According to the invention, the scanning means includes reflection means that can be angularly displaced about two orthogonal rotation axes. As a result, the light from the light source can be scanned in two directions orthogonal to each other. Therefore, a two-dimensional image can be displayed on the display target.

  Furthermore, according to the present invention, the reflecting means includes a galvanometer mirror that is angularly displaceable about a predetermined first rotation axis and is angularly displaceable about a second rotation axis that is orthogonal to the first rotation axis. As a result, it is possible to realize a configuration in which light from the light source is scanned in two directions orthogonal to each other.

  Further, according to the present invention, it includes a diaphragm unit that is provided at a focal point of light guided from the second light guide unit and transmits light from the second light guide unit. Thereby, the remaining light except the light from the light source can be prevented from being guided to the scanning means via the second light guide means by the diaphragm means. Thereby, it is possible to prevent unwanted light from being included in the light displayed on the display target, and it is possible to guide only the desired light to the display target as much as possible.

  Furthermore, according to this invention, the control means which controls the intensity | strength of the light which a light source radiate | emits is included. By controlling the light intensity of the light source by the control means, the gradation and brightness of the image information displayed on the display target can be adjusted to a desired state. This makes it possible to display image information that is easy for the operator to visually recognize.

  Furthermore, according to the present invention, since the light source is a light emitting diode, the light source can be operated with power saving. Moreover, it can implement | achieve at low cost rather than the case where a light source is implement | achieved with a laser apparatus.

  Furthermore, according to the present invention, since the light source includes a plurality of light emitting diodes, higher-definition image information can be displayed by controlling each light emitting diode individually.

  Furthermore, according to the present invention, each light emitted from the plurality of light emitting diodes has at least one color of red, blue and green. As a result, the image information displayed on the display target can be displayed in full color.

  Furthermore, according to the present invention, the light emitting diode is mounted on the substrate by a flip chip bonding method. Accordingly, light emitted from the light emitting diode can be prevented as much as possible from being blocked by the mounted substrate, and light can be used efficiently.

  Further, according to the present invention, the diaphragm means is formed by irradiating a precursor of the diaphragm means provided on the glass substrate with laser light. By irradiating the precursor of the aperture means with laser light, an aperture means for guiding the light from the second light guide means to the scanning means can be realized.

  Furthermore, according to the present invention, the diaphragm means is formed using a non-reflective material. Accordingly, it is possible to prevent the aperture means from reflecting the light from the second light guide means undesirably. Therefore, the light from the light source can be used efficiently.

  Furthermore, according to the present invention, the third light guide means includes a half mirror. The light from the light source is guided to the display object by the half mirror, and the opposite side of the half mirror can be visually recognized from the display object side through the half mirror. Thus, when the display target is the eyes of the operator, the operator can visually recognize the image information from the light source and observe the surrounding situation through the half mirror.

  Further, according to the present invention, since the third light guide means includes the aspherical eccentric mirror, the light from the light source can be converted into parallel light and guided to the display target.

  Further according to the invention, the third light guide means includes an aspheric decentered prism. By reflecting the light from the light source inside the aspherical eccentric curved prism, the light is converted into parallel light and guided to a display target. As a result, the distance from the scanning means to the display object can be reduced as compared with the case where a condensing lens is used for the third light guiding means. Accordingly, the configuration of the display device can be reduced in size and weight.

  Further, according to the present invention, since the precursor of the diaphragm means integrated with the light collecting means is irradiated with the collimated ultraviolet light through the light collecting means, the ultraviolet light guided from the light collecting means is reduced. The precursor is irradiated. By irradiating the precursor of the diaphragm means with ultraviolet light, the state of the precursor of the diaphragm means can be changed. Accordingly, the portion irradiated with the ultraviolet light can be processed so as to have translucency, and a diaphragm means for transmitting light from the light collecting means can be manufactured. The position where the ultraviolet light is irradiated is equal to the position where the light emitted from the light source is guided. Therefore, by processing the position where the laser light is irradiated so as to have translucency, A diaphragm means that transmits and blocks the remaining unwanted light can be manufactured.

  Hereinafter, a plurality of embodiments for carrying out the present invention will be described with reference to the drawings. Portions corresponding to the matters described in the preceding forms in each embodiment are denoted by the same reference numerals, and overlapping description may be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding section. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder. The start condition of each flowchart is not necessarily limited to the described start condition.

FIG. 1 shows a head mounted display according to an embodiment of the present invention.
FIG. 4 is a perspective view showing a simplified display (abbreviation: HMD) 20. FIG. 2 is a front view showing the HMD 20. FIG. 3 is an enlarged front view showing the vicinity of the light source 21 constituting the HMD 20. The HMD 20 is a display device and is attached to a part of an operator to display image information. The HMD 20 is mounted on the operator's head and displays image information at a position facing the operator's eyes 22 that are display targets. The HMD 20 squeezes the light source 21 that emits the light beam 23, the lens array 24 that is an assembly of a plurality of lenses, the first condenser 25 and the second condenser lens 26 that collect the light beam 23, and the light beam 23. A diaphragm plate 27, a scanning unit 28 that scans the light beam 23, a control circuit 29 that controls the light source 21, and an eyepiece lens 30 that condenses the light beam 23 on the eyes 22 of the operator.

  The light source 21 includes a plurality of light emitting diodes (abbreviated as LEDs 31), and each LED 31 emits a light beam 23 having colors such as red, blue, and green. Each LED 31 has an emission region of, for example, 200 μm or more and 300 μm or less. As shown in FIG. 1, the LEDs 31 are sequentially arranged in a horizontal direction that is a predetermined first direction and a vertical direction that is a second direction substantially orthogonal to the first direction, and are arranged in a two-dimensional matrix. Each LED 31 is configured such that the optical axes of the emitted light beams 23 are parallel to each other. The LEDs 31 are arranged so that the emitted colors are different from each other in the horizontal direction. For example, three colors of red, blue, and green are arranged, and LEDs 31 of the same color are arranged in the vertical direction. The light source 21 is electrically connected to the control circuit 29 and controls each LED 31 based on the control information given from the control circuit 29.

  The lens array 24 is a first light guide unit that converts the light beam 23 emitted from each LED 31 into a plurality of parallel lights, and the light guide region of each parallel light is smaller than the emission region from each LED 31. Guide the light so that The lens array 24 is provided with a plurality of microlenses 32 having a diameter of, for example, 5 μm or more and 20 μm or less smaller than the emission region of each LED 31 and arranged in a two-dimensional matrix as shown in FIG. The optical axes of the micro lenses 32 are provided so as to be parallel to each other. The optical axis of each microlens 32 is provided so as to be parallel to the optical axis of each LED 31. Therefore, as shown in FIG. 3, the light beam 23 emitted from each LED 31 is incident on a plurality of microlenses 32 constituting the lens array 24. As a result, the lens array 24 converts the light beams 23 emitted from the respective LEDs 31 into a larger number of parallel lights than the number of the LEDs 31, and the parallel lights are guided to the first light collecting unit 25.

  The first light collecting unit 25 collects the plurality of lights from the lens array 24, respectively. The first light collecting unit 25 includes a plurality of first light collecting lenses 33 that collect the light beam 23. As shown in FIG. 1, the first condenser lenses 33 are arranged in a two-dimensional matrix, and are configured such that the optical axes of the first condenser lenses 33 are parallel to each other. The number of first condenser lenses 33 is the same as the number of LEDs 31, and the optical axes of the first condenser lenses 33 are arranged at positions facing each other in the optical axis direction, and coincide with the optical axes of the LEDs 31. To be provided. Therefore, the light beam 23 emitted from each LED 31 enters each first condenser lens 33 via the lens array 24. Accordingly, each first condenser lens 33 collects the parallel light from the lens array 24.

  The diaphragm plate 27 is a diaphragm unit, and is provided at or near the focal point of the first condenser lens 33, and transmits the light beam 23 from the first condenser lens 33. The diaphragm plate 27 is configured to transmit the light beam 23 from the first condenser lens 33 and block the remaining light. The diaphragm plate 27 has a flat plate shape, and a plurality of light transmitting portions 34 that transmit light in the thickness direction are formed. In the present embodiment, translucent portion 34 is realized by a through-hole penetrating in the thickness direction. Each translucent portion 34 is formed at a position corresponding to the optical axis direction of each first condenser lens 33. In other words, each translucent section 34 is arranged so as to be near the focal point of each corresponding first condenser lens 33. The aperture plate 27 guides the light beam 23 from the first condenser 25 to the second condenser lens 26.

  The second condenser lens 26 condenses all the light beams 23 that diffuse from the respective light transmitting portions 34 of the diaphragm plate 27. The second condenser lens 26 is provided so as to condense the light beam 23 on the scanning unit 28.

  The scanning unit 28 is a scanning unit that scans light from the second condenser lens 26. The scanning unit 28 reflects and deflects the light beam 23 two-dimensionally and guides the light beam 23 to the eyepiece 30. The scanning unit 28 is electrically connected to the control circuit 29, and deflects and scans the light beam 23 based on control information given from the control circuit 29.

  The scanning unit 28 includes a mirror that can be angularly displaced about two orthogonal rotation axes. In the present embodiment, the scanning unit 28 can be angularly displaced by being resonantly driven about a first rotation axis that extends in a predetermined horizontal direction. A galvanometer mirror that can be angularly displaced about a second rotation axis extending in the vertical direction, which is a vertical direction orthogonal to one rotation axis, is included. With this configuration, the light beam 23 can be scanned two-dimensionally.

  The eyepiece 30 converts the light beam 23 scanned by the scanning unit 28 into parallel light, and guides it to the operator's eye 22 that is a display target. In other words, the light beam 23 that has passed through the eyepiece 30 becomes substantially parallel light and concentrates on the pupil of the operator. The light beam 23 collected by the operator's pupil forms an image on the retina.

  The control circuit 29 is a control unit and controls the light source 21 and the scanning unit 28. The control circuit 29 controls the light source 21 and the scanning unit 28 based on image information given from the outside. The control circuit 29 controls the intensity of the light beam 23 emitted from each LED 31 corresponding to the given image information. Further, the control circuit 29 performs modulation control by time division by switching the switching mode of each LED 31. The control circuit 29 controls the scanning width and scanning speed of the scanning unit 28 based on operation information given from the operator.

  FIG. 4 is an enlarged front view showing the vicinity of the LED 31 constituting the light source 21. Each LED 31 is electrically connected to the substrate 35. The substrate 35 is provided with a recess 36 that is recessed in the thickness direction at a portion where the LED 31 is mounted. The inner surface portion of each recess 36 is configured to have light reflectivity for reflecting the light beam 23. The LED 31 is mounted on the bottom of each recess 36. In the present embodiment, each LED 31 has an electrode provided on the substrate 35 side and is mounted on the substrate 35 by a flip chip bonding method to have a flip chip structure. Thereby, the diverging light in the direction orthogonal to the optical axis, which is the light beam 23 emitted from each LED 31, is reflected by the inner surface portion of the recess 36. Therefore, the utilization efficiency of the light emitted from the LED 31 can be improved. Moreover, the light quantity emitted from the LED 31 can be increased by adopting the flip chip structure.

  FIG. 5 is a flowchart showing an example of a manufacturing method of the diaphragm plate 27. FIG. 6 is a front view showing an example of the manufacturing process of the diaphragm plate 27 step by step. In step a0, manufacture of the diaphragm plate 27 is started, and the process proceeds to step a1. In step a1, as shown in FIG. 6A, a film 38 made of a metal, for example, aluminum (Al) and titanium tungsten (TiW), which is a precursor of the diaphragm plate 27, is formed on one surface portion of the glass substrate 37. The process proceeds to step a2.

  In step a2, the first step is performed. As shown in FIG. 6B, the glass substrate 37 and the first light collecting unit 25 are bonded and integrated, and the process proceeds to step a3. The glass substrate 37 is disposed such that the thickness direction thereof is parallel to the optical axis direction of the first condenser lens 33 of the first condenser 25. In step a3, the second step is performed, and as shown in FIG. 6C, the laser device 39 converts the collimated laser beam 40 from the side opposite to the glass substrate 37 of the first condenser lens 33. Then, the light is irradiated toward the first light collecting unit 25, and this flow is finished.

  As a result, as shown in FIG. 6D, the laser light 40 of the film 38 made of metal is irradiated, the irradiated region is evaporated, and the light transmitting portion 34 is formed. Thereby, the diaphragm plate 27 is formed.

  FIG. 7 is a flowchart showing another example of the manufacturing method of the diaphragm plate 27. FIG. 8 is a front view showing another example of the manufacturing process of the diaphragm plate 27 in stages. In step b0, manufacture of the diaphragm plate 27 is started, and the process proceeds to step b1. In step b1, as shown in FIG. 8A, a negative resist film 38 is formed on one surface portion of the glass substrate 37, and the process proceeds to step b2.

  In step b2, as shown in FIG. 8B, the glass substrate 37 and the first light collecting unit 25 are bonded and integrated, and the process proceeds to step b3. The glass substrate 37 is disposed such that the thickness direction thereof is parallel to the optical axis direction of the first condenser lens 33 of the first condenser unit 25. In step b3, as shown in FIG. 8C, parallel light is irradiated toward the first light collecting unit 25 from the side opposite to the glass substrate 37 of the first light collecting lens 33 using the exposure device 41. The negative resist film 38 is developed to leave the resist 42 at a position to become the light transmitting portion 34, and the process proceeds to Step b4.

  In step b4, as shown in FIG. 8D, a metal film 43, which is a precursor of the diaphragm plate 27, is deposited on one surface portion where the resist 42 remains on the glass substrate 37, and the process proceeds to step b5. In step b5, the lift-off is performed to form the translucent part 34, and this flow is finished.

  As a result, as shown in FIG. 8 (e), the resist 42 is removed, and the removed portion becomes the light transmitting portion 34, and the diaphragm plate 27 is formed. In this example, the metal film 43 can also be used to manufacture the diaphragm plate 27 using a non-reflective material, whereby stray light associated with light reflection around the diaphragm plate 27 can be reduced.

  As described above, in the HMD 20 of the present embodiment, the light beam 23 emitted from each LED 31 is converted into a plurality of parallel lights by the lens array 24, and the light guide region of each parallel light is emitted from the LEDs 31. It is made smaller than the area. Accordingly, each of the parallel lights is regarded as a plurality of point light sources, and the plurality of lights are collected by the first condenser lens 33. Therefore, even if the light beam 23 from each LED 31 is condensed to be smaller than the emission region of each LED 31 by the first condenser lens 33, the loss of light can be suppressed as much as possible. The light condensed by the first condenser lens 33 is scanned by the scanning unit 28, converted into parallel light by the eyepiece lens 30, and guided to the operator's eyes 22. As a result, the light beam 23 of the LED 31 can be efficiently used to display image information obtained by scanning the light from the LED 31 on the operator's eyes 22. As a result, the present invention can be realized with a simple configuration change by simply adding the lens array 24 to the conventional technique, and an increase in manufacturing cost can be suppressed as much as possible.

  In the present embodiment, the scanning unit 28 includes a mirror that can be angularly displaced about two orthogonal rotation axes. Thereby, the light beam 23 from the light source 21 can be scanned in two directions orthogonal to each other. Therefore, a two-dimensional image can be displayed on the display target.

  Furthermore, in the present embodiment, the mirror includes a galvanometer mirror that is angularly displaceable about a predetermined first rotation axis and is angularly displaceable about a second rotation axis that is orthogonal to the first rotation axis. As a result, it is possible to realize a configuration in which light from the light source is scanned in two directions orthogonal to each other.

  Further, in the present embodiment, a diaphragm plate 27 that is provided at the focal point of the light beam 23 guided from the first condenser lens 33 and transmits the light beam 23 from the first condenser lens 33 is included. Thereby, the remaining light except the light from the light source 31 can be prevented from being guided to the scanning unit 28 via the first condenser lens 33 by the diaphragm plate 27. Thereby, it is possible to prevent unwanted light from being included in the light displayed on the display target, and it is possible to guide only the desired light to the display target as much as possible.

  Furthermore, the present embodiment includes a control circuit 29 that controls the intensity of light emitted from the light source 21. By controlling the light intensity of the light source 21 by the control circuit 29, the gradation and brightness of the image information displayed on the display target can be adjusted to a desired state. This makes it possible to display image information that is easy for the operator to visually recognize.

  Further, in the present embodiment, since the light source 21 is the light emitting diode 31, the light source 21 can be operated with power saving. Further, the light source 21 can be realized at a lower cost than the case where the light source 21 is realized by a laser device as in the prior art. In addition, the production cost can be reduced by using mass-produced general-purpose LEDs 31.

  Furthermore, according to the present invention, since the light source 21 includes a plurality of light emitting diodes 31, it is possible to display higher-definition image information by individually controlling each light emitting diode 31.

  Further, in the present embodiment, each light beam 23 emitted from the plurality of light emitting diodes 31 has at least one color of red, blue, and green. As a result, the image information displayed on the display target can be displayed in full color.

  Further, in the present embodiment, the light emitting diode is mounted on the substrate by a flip chip bonding method. Accordingly, light emitted from the light emitting diode can be prevented as much as possible from being blocked by the mounted substrate, and light can be used efficiently. The plurality of LEDs 31 may be a combination of multi-color LEDs 31 other than the three colors of red, blue, and green, such as yellow and yellow-green. As a result, the banquet color can be further improved.

  Further, in the present embodiment, the diaphragm plate 27 is formed by irradiating the precursor 38 of the diaphragm plate 27 provided on the glass substrate 37 with collimated ultraviolet light. By irradiating the precursor 38 of the diaphragm plate 27 with the collimated ultraviolet light, the diaphragm plate 27 for guiding the light from the first condenser lens 33 to the scanning unit 28 can be realized.

  The diaphragm plate 27 may be formed using a non-reflective material. Accordingly, it is possible to prevent the diaphragm plate 27 from reflecting light from the first condenser lens 33 undesirably. Therefore, the light from the light source 21 can be used efficiently.

  Furthermore, according to the present invention, the precursor 38 of the diaphragm plate 27 integrated with the first light collecting unit 24 that is a light collecting unit is irradiated with the collimated ultraviolet light via the first light collecting unit 24. Therefore, the collimated ultraviolet light guided from the first light collector 24 is applied to the precursor 38 of the diaphragm plate 27. By irradiating the precursor 38 of the diaphragm plate 27 with collimated ultraviolet light, the state of the precursor 38 of the diaphragm plate 27 can be changed, for example, evaporated. Accordingly, the portion irradiated with the collimated ultraviolet light can be processed to become a translucent part 34 having translucency, and a diaphragm plate 27 that transmits the light from the first light collecting part 24. Can be manufactured. Since the position where the collimated ultraviolet light is irradiated is equal to the position where the light beam 23 emitted from the light source is guided, processing is performed so that the position where the collimated ultraviolet light is irradiated has translucency. Accordingly, it is possible to manufacture the diaphragm plate 27 that transmits the light beam 23 from the first light collecting unit 24 and shields the remaining unwanted light.

  As described above, the HMD 20 according to the present embodiment is an image observation apparatus that observes a two-dimensional image as an aerial image through the eyepiece 30, and includes a light source 21 that emits a light beam 23, and the emitted light. A lens array 24 that uses the beam 23 as a plurality of point light sources 21, a first condensing unit 25 that condenses light from the plurality of point light sources 21 with a lens, a diaphragm plate 27 that further narrows down the condensed light, and a focal point A second condenser lens 26 that condenses the light that has spread after passing through the position, a scanning unit 28 that scans the focused light two-dimensionally, and a light beam 23 that is reflected and deflected by the scanning unit 28 is operated. The eyepiece 30 is guided to the pupil of the person and forms a two-dimensional image on the retina. As a result, the light from the light source 21 can be efficiently imaged on the retina, so that a bright and clear image can be obtained.

  Next, another embodiment of the present invention will be described. FIG. 9 is a perspective view schematically showing an HMD 50 according to another embodiment of the present invention. The HMD 50 of the present embodiment is characterized in that it further includes a half mirror 51. For example, the half mirror 51 has a characteristic of thinning a metal film applied on the surface of glass and transmitting a predetermined light beam 23. In other words, half of the light is reflected and half is transmitted. The half mirror 51 is disposed so as to reflect the light beam 23 from the eyepiece lens 30 and guide the reflected light to the position of the operator's eyes 22. The half mirror 51 is configured so that an operator can observe the surrounding landscape via the half mirror 51.

  As a result, the operator can observe the image displayed by the HMD 50 and also observe the surrounding scenery via the half mirror 51. Accordingly, the operator can observe the image information displayed by the HMD 50 while superimposing it on the surrounding scenery, so that convenience is further improved.

  Next, still another embodiment of the present invention will be described. FIG. 10 is a perspective view showing a simplified form of an HMD 55 according to still another embodiment of the present invention. The HMD 55 of the present embodiment is characterized in that it includes an eccentric curved mirror 56 instead of the eyepiece 30 of the above-described embodiment. The decentered curved mirror 56 is an aspheric decentered mirror that converts the light beam 23 from the scanning unit 28 into parallel light and guides it to the position of the eyes 22 of the operator. Furthermore, the eccentric curved mirror 56 has a function as a half mirror. In other words, the eccentric curved mirror 56 has both functions of the eyepiece 30 and the half mirror 51 of the above-described embodiment.

  As a result, the operator can observe the image displayed by the HMD 55 and also observe the surrounding scenery via the eccentric curved mirror 56. Accordingly, the operator can observe the image information displayed by the HMD 55 while superimposing it on the surrounding scenery, so that convenience is further improved. In addition, the number of parts can be reduced, and the manufacturing cost can be reduced.

  Next, still another embodiment of the present invention will be described. FIG. 11 is a simplified perspective view showing an HMD 60 according to still another embodiment of the present invention. The HMD 60 of the present embodiment is characterized in that it includes an eccentric curved prism 61 instead of the eyepiece 30 of the above-described embodiment. The decentered curved prism 61 is an aspheric decentered prism. The decentered curved prism 61 is converted into parallel light by reflecting the light beam 23 from the scanning unit 28 inside the decentered curved prism 61 and led to the position of the eyes 22 of the operator. .

  Therefore, by using the decentered curved prism 61, the distance from the scanning unit 28 to the operator's eyes 22 can be shortened compared to the case of using the eyepiece 30. As a result, the configuration of the HMD 60 can be reduced in size and weight, and the operator can use it by wearing it on the head without any discomfort.

It is a perspective view which simplifies and shows HMD20 of one embodiment of the present invention. It is a front view which shows HMD20. It is a front view which expands and shows the light source 21 vicinity which comprises HMD20. It is a front view which expands and shows LED31 vicinity which comprises the light source 21. FIG. 5 is a flowchart showing an example of a method for manufacturing the diaphragm plate 27. It is a front view which shows an example of the manufacturing process of the aperture plate 27 in steps. 6 is a flowchart showing another example of a manufacturing method of the diaphragm plate 27. It is a front view which shows the other example of the manufacturing process of the aperture plate 27 in steps. It is a perspective view which simplifies and shows HMD50 of other embodiments of the present invention. It is a perspective view which simplifies and shows HMD55 of other form of implementation of this invention. It is a perspective view which simplifies and shows HMD60 of other form of implementation of this invention. It is a front view which simplifies and shows HMD1 of the 1st prior art. It is a front view which simplifies and shows HMD10 of the 2nd prior art.

Explanation of symbols

20, 50, 55, 60 HMD
21 Light source 22 Eye 23 Light beam 24 Lens array 25 1st condensing part 26 2nd condensing lens 27 Diaphragm plate 28 Scanning part 29 Control circuit 30 Eyepiece 31 LED
32 Microlens 33 First condenser lens 34 Translucent part 51 Half mirror 56 Eccentric curved mirror 61 Eccentric curved prism

Claims (15)

A display device that is attached to a part of an operator and displays image information,
A light source;
A first light guide means for converting light emitted from the light source into a plurality of parallel lights, and a light guide area of each parallel light being smaller than an emission area from the light source;
A second light guide means for condensing a plurality of lights from the first light guide means,
Scanning means for scanning light from the second light guiding means;
A display device comprising: third light guide means for converting light scanned by the scanning means into parallel light and guiding the light to a display target.   2. The display device according to claim 1, wherein the scanning unit includes a reflection unit that can be angularly displaced about two orthogonal rotation axes.   3. The display according to claim 2, wherein the reflecting means includes a galvanometer mirror that is angularly displaceable about a predetermined first rotation axis and is angularly displaceable about a second rotation axis orthogonal to the first rotation axis. apparatus.   The display according to any one of claims 1 to 3, further comprising a diaphragm unit provided at a focal point of the light guided from the second light guide unit and transmitting the light from the second light guide unit. apparatus.   The display device according to claim 1, further comprising a control unit that controls intensity of light emitted from the light source.   The display device according to claim 1, wherein the light source is a light emitting diode.   The display device according to claim 6, wherein the light source includes a plurality of light emitting diodes.   The display device according to claim 7, wherein each light emitted from the plurality of light emitting diodes has at least one color of red, blue, and green.   The display device according to claim 6, wherein the light emitting diode is mounted on the substrate by a flip chip bonding method.   5. The display device according to claim 4, wherein the aperture means is formed by irradiating a precursor of the aperture means provided on the glass substrate with laser light.   The display device according to claim 4, wherein the aperture means is formed using a non-reflective material.   The display device according to claim 1, wherein the third light guide unit includes a half mirror.   The display device according to claim 1, wherein the third light guide unit includes an aspheric eccentric mirror.   The display device according to claim 1, wherein the third light guide unit includes an aspheric decentered prism. A method of manufacturing an aperture means disposed in the middle of an optical path of a display device that is mounted on a part of an operator and displays image information,
A first step of integrating the condensing means for condensing the light emitted from the light source and converted into a plurality of parallel lights, and the precursor of the diaphragm means;
And a second step of irradiating the precursor with collimated ultraviolet light through the condensing means.

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