JP7048933B1 - A glass substrate for stereoscopic display and a non-contact operation device equipped with this - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass substrate for stereoscopic display and a non-contact operation device capable of making an observer visually recognize a stereoscopic image without increasing the number of parts at low cost. SOLUTION: A glass substrate 10 for stereoscopic display is configured to express a stereoscopic image using binocular parallax by the applied light. The three-dimensional display glass substrate 10 includes a three-dimensional display region 100 provided with a plurality of three-dimensional display fine grooves (arc-shaped fine grooves 102) arranged based on the shape of an image to be three-dimensionally displayed. The stereoscopic display region 100 causes the observer to see stereoscopically at a position away from the substrate surface by causing at least one of scattering, refraction, and reflection of light applied to the plurality of stereoscopic microgrooves. It is configured to make the image visible. [Selection diagram] Fig. 1

Description

The present invention relates to, for example, a glass substrate for stereoscopic display applicable to an operation panel of a non-contact operation device and a non-contact operation device including the glass substrate for stereoscopic display.

An operation device is generally provided with an operation panel that accepts a pressing operation by an operator, and outputs a signal corresponding to an operator's pressing operation on an operation button or a guide mark on the operation panel to operate the operation device. It operates the target electronic device. Conventionally, various developments have been made to improve the convenience and design of the operation panel, and it can be said that the operation device has been developed.

However, in recent years, from the viewpoint of preventing the spread of infectious diseases due to contact transmission, there is a rapidly increasing demand for touchless operation that enables non-contact operation.

Therefore, focusing on the touchless operation device, in many of the touchless operation devices, the presence of the operator's finger and the stereoscopic image for operation guidance that is projected from the operation panel to the front is detected. A configuration including a detection means has been widely adopted.

Japanese Unexamined Patent Publication No. 10-223102 Japanese Unexamined Patent Publication No. 2012-194617

However, conventional touchless operating devices often require expensive imaging means such as a refractive index distribution type lens element, and it has been difficult to achieve touchless operation at low cost.

Even if the cost of the imaging means is reduced, it is provided with a means for displaying the original picture of the guide mark for guiding the operation and a means for reproducing the stereoscopic image for making the original picture stereoscopically viewed. Since it is necessary, there is also the inconvenience that the number of parts increases.

An object of the present invention is to provide a glass substrate for stereoscopic display and a non-contact operating device, which are inexpensive and can make an observer visually recognize a stereoscopic image without increasing the number of parts.

The glass substrate for stereoscopic display according to the present invention is configured to express a stereoscopic image using binocular parallax by the applied light. Examples of the stereoscopic image include a guide mark for operation guidance, an image of text information, and an image (decorative pattern, logo mark, etc.) for improving aesthetics and visibility.

Such a three-dimensional display glass substrate is used, for example, in a non-contact operating device for guiding a position where an operator should hold his / her hand. However, the present invention is not limited to this application, and can be used for the protective glass of a portable terminal, the decorative glass for the back surface, and the like.

This three-dimensional display glass substrate includes a three-dimensional display area provided with a plurality of three-dimensional display fine grooves arranged based on the shape of the image to be three-dimensionally displayed. This stereoscopic display region causes the observer to see a stereoscopic image at a position away from the substrate surface by causing light applied to a plurality of stereoscopic microgrooves to be at least one of scattering, refraction, and reflection. Is configured to be visible.

Normally, the light applied to the three-dimensional display fine groove is directionally scattered, refracted, or reflected in a plane perpendicular to the groove. When presenting a stereoscopic image to the operator, only one of the optical phenomena of scattering, refraction, or reflection may be used, or two or more may be used at the same time.

The light applied from the light source to the microgrooves for stereoscopic display scatters, refracts, reflects, etc. with directivity in the microgrooves for stereoscopic display, and becomes bright spots as elements constituting the image, and becomes the left eye of the observer and the observer's left eye. It suffices to reach the right eye as an image for the left eye and an image for the right eye, respectively. By causing such binocular parallax, the observer can visually recognize the stereoscopic image.

As an example of the mechanism for making the observer visually recognize the stereoscopic image, there is a principle of 3D display technology using directional light scattering called arc 3D, but the principle itself has been known conventionally. Is.

However, in the conventional arc 3D, what was considered to be difficult to be put into practical use by applying it to a touchless operation panel or for decoration of a mobile terminal device is preferably put into practical use in the present invention. ..

The conventional arc 3D technology is realized by making an arc-shaped scratch on the main surface of the plastic plate, and the deterioration of the plastic and the scattering due to the fine structure of the scratch surface are conspicuous. In particular, there was a problem of diffuse reflection at the points where scratches intersect.

In addition, the conventional arc 3D technology is difficult to use industrially because it requires time and cost for processing to form an arc-shaped scratch. Moreover, if it is applied to the operation panel as it is, the arc-shaped scratches themselves become conspicuous, and there is a concern that the aesthetic appearance of the operation panel may be impaired, and no attempt has been made to put it into practical use.

On the other hand, in the present invention, the arc 3D technology is suitably applied to a glass substrate, and the arc 3D technology is successfully applied to a touchless operation panel or the like for practical use.

The above-mentioned fine groove for three-dimensional display is an inconspicuous groove provided on a transparent glass substrate, and unlike scratches, the fine groove itself is hardly visible by the operator. Therefore, due to the presence of the fine groove for three-dimensional display. The aesthetics are not easily spoiled.

The fine groove for three-dimensional display is preferably arcuate, but the three-dimensional display function is suitably exhibited even if the shape includes a curved line including an arc portion or a combination of the curved line and the straight line. Further, even if the stereoscopic display fine groove is composed of only straight lines, the stereoscopic display function itself is not lost only when the distance of the stereoscopic display image becomes long or the observation distance becomes long. ..

Examples of the method for forming fine grooves for stereoscopic display on a plate-shaped glass include etching processing such as wet etching and dry etching, and laser assist etching processing in which laser processing is combined with this. It is not limited to.

In the above configuration, an expensive imaging means such as a refractive index distribution type lens element for forming a guide mark for operation guidance in the air, a stereoscopic image reproduction means for making the guide mark stereoscopic, and the like are separately provided. There is no need to provide it.

In the above configuration, it is preferable that the three-dimensional display fine groove has an etching-treated surface inside. The etching-treated surface is a smooth surface obtained by a chemical treatment such as an etching treatment (the surface roughness is smaller than that in the case of physical treatment). The presence of such an etching-treated surface makes it possible to reduce the surface roughness of the glass to, for example, about 100 nm, so that diffused reflection of light and the like are prevented and directivity is easily maintained.

Further, it is preferable that the fine groove for stereoscopic display has a metal layer at the bottom, and the metal layer is configured to reflect at least a part of visible light.

By providing such a metal layer, it becomes easy for the observer to visually recognize the stereoscopic image by utilizing the reflection of light.

Further, a metal layer is provided on the main surface opposite to the main surface provided with the fine groove for stereoscopic display, and the metal layer is configured to reflect a part of visible light and transmit the other part. It is preferable to be done.

By adopting such a configuration, the light is colored when passing through the metal layer, so that the observer can visually recognize a clear stereoscopic image.

Further, it detects the operation operation of the operator to the position where the above-mentioned glass substrate for stereoscopic display, the light source configured to irradiate the glass substrate for stereoscopic display with light, and the position where the image of the guide mark is formed. It is preferable to configure a non-contact operating device including at least the detection means configured as described above.

According to such a non-contact operation device, it is possible to realize a touchless operation device having a high contact infection prevention effect with a simple configuration and at low cost.

According to the present invention, a glass substrate for stereoscopic display and a non-contact operating device capable of allowing an observer to visually recognize a stereoscopic image without increasing the number of parts are realized at low cost.

It is a figure which shows the schematic structure of the touchless operation apparatus which concerns on one Embodiment of this invention. It is a figure explaining the schematic structure of the glass substrate for three-dimensional display. It is a figure which shows an example of the laser processing processing in the manufacturing process of the glass substrate for three-dimensional display. It is a figure which shows an example of the etching process in the manufacturing process of the glass substrate for three-dimensional display. It is a figure which shows the example of the variation of the etching process in the manufacturing process of the glass substrate for three-dimensional display. It is a figure which shows another example of the manufacturing process of the glass substrate for stereoscopic display. It is a figure which shows another example of the manufacturing process of the glass substrate for stereoscopic display. It is a figure which shows the example of the variation of the guide mark for operation guidance. It is a figure which shows the example of the variation of the structure of the glass substrate for three-dimensional display. It is a figure which shows the example of the structure which provided the metal layer on the glass substrate for three-dimensional display. It is a figure which shows the example which uses the glass substrate for stereoscopic display for the back glass of a mobile terminal apparatus. It is a figure which shows another example of the structure of the fine groove for three-dimensional display.

FIG. 1A shows an outline of a touchless operation device 30 to which a three-dimensional display glass substrate according to an embodiment of the present invention is applied. The touchless operation device 30 is an operation device capable of non-contact operation. The touchless operation device 30 includes at least a glass substrate 10 for stereoscopic display, a light source 12, a sensor 14, and a control unit (not shown) that collectively controls the operation of each part of the device.

The three-dimensional display glass substrate 10 has a transparent plate shape, and scatters the light emitted from the light source 12 so that the operator at the position of the viewpoint 40 is separated from the main surface of the three-dimensional display glass substrate 10. A stereoscopic display area 100 configured to show the guide mark image 20 at the position is provided.

In this embodiment, a call chime mark is adopted as a guide mark to be displayed in 3D (floating display), and the shape of the call chime is exhibited at a position separated by a distance D from the main surface of the glass substrate 10 for 3D display. The guide mark image 20 can be seen.

The light source 12 is configured to irradiate the glass substrate 10 for stereoscopic display with highly directional light such as an LED unit, for example. The higher the directivity of the light of the light source 12, the brighter the bright spot pattern constituting the guide mark image 20 looks. Therefore, it is preferable to appropriately select a light source 12 having a suitable directivity according to the brightness required for the guide mark image 20. ..

The sensor 14 is configured to detect whether or not the operator's fingers are present at the position where the guide mark image 20 is formed. An infrared sensor is mentioned as an example of the configuration of the sensor 14.

However, other types of sensors (for example, an optical sensor that detects the presence of the operator's finger at the measurement position based on the detection state of the reflected light or transmitted light emitted toward the position to be measured). It is also possible to use.

Here, the above-mentioned stereoscopic display region 100 will be described more specifically with reference to FIG. 1 (B). The three-dimensional display region 100 has a plurality of arcuate fine grooves 102 (corresponding to the three-dimensional display fine grooves of the present invention) designed according to a predetermined rule based on the shape of the desired guide mark.

The stereoscopic display region 100 makes it possible to stereoscopically view a desired guide mark by utilizing the light scattering characteristics of the plurality of arcuate fine grooves 102.

As shown in FIG. 1 (C), this is the principle that the portion satisfying the condition of contacting the circle 70 about the straight line 60 connecting the light source 12 and the position of the viewpoint 40 looks bright (so-called ARC 3D (arc)). As the principle of 3D), many researchers including Mr. W.T.Plummer in 1992 are studying the principle).

Since the plurality of arcuate fine grooves 102 provided in the three-dimensional display area 100 have many portions in contact with the circle 70 shown in FIG. 1C, they are bright for the operator viewed from the position of the viewpoint 40. You will be able to see it. However, even when a linear three-dimensional display fine groove is adopted instead of the arc-shaped fine groove 102, the portion in contact with the circle 70 looks selectively bright, so that the three-dimensional display function itself is not lost.

In the so-called arc 3D display technology, a stereoscopic image (a stereoscopic image) in which a plurality of arcuate fine grooves 102 are provided in a stereoscopic display region of a three-dimensional display glass substrate 10 and illuminated by a light source 12 to exhibit a desired guide mark shape (a stereoscopic image). The guide mark image 20) can be presented.

Here, when light is incident on a plurality of arcuate microgrooves 102 and the light is directionally scattered, refracted, or reflected in each of the arcuate microgrooves 102, the arcuate microgrooves 102 are used. Light is strongly emitted from the cone in the direction of the cone, and this is perceived as a bright spot in the eyes of the operator at the position of the viewpoint 40.

Then, the phenomenon that the bright spot in the shape of a circle continuously moves on the arc with the movement of the position of the viewpoint 40 is used. Since the positions of the viewpoints 40 are different between the left and right eyes, it is presumed that images having different parallax are incident on the left and right eyes, and that the operator obtains a stereoscopic effect by continuous stereoscopic vision.

Subsequently, the above-mentioned stereoscopic display region 100 will be described in more detail with reference to FIGS. 2 (A) to 2 (C). As shown in these figures, in the stereoscopic display region 100, each of the arcuate microgrooves 102 forms a plurality of points 80 constituting the guide mark to be stereoscopically displayed, in other words, along the shape of the guide mark. It has an arc shape with a predetermined radius and a predetermined angle centered on each of the points (pixels) arranged at predetermined intervals.

The distance between the plurality of points 80 constituting the guide mark may be appropriately determined based on the feasible width of the arcuate fine groove 102 and the like. By arranging the points 80 at intervals of about 0.5 to 20 mm (usually about 0.5 to 1 mm), a guide mark image 20 having a resolution that can be used for operation guidance is formed. be able to.

Here, it is known that the distance D shown in FIG. 1A is affected by the size of the radius R of the arcuate fine groove 102 shown in FIG. 2C.

For example, the larger the radius R, the larger the distance D (depth). Further, the larger the angle (incident angle) of the light illuminated from the light source 12 with respect to the three-dimensional display glass substrate 10, the smaller the distance D (depth). Further, even if the position of the viewpoint 40 of the operator is effectively changed to the left or right, the distance D (depth) hardly changes.

Subsequently, an example of a method for manufacturing the three-dimensional display glass substrate 10 will be described with reference to FIGS. 3 to 5.

First, as shown in FIGS. 3 (A) and 3 (B), the laser beam is scanned at the planned formation position of the arcuate fine groove 102 determined by the shape of the desired guide mark, and the modification for forming the fine groove is performed. The quality line 104 is formed.

The type and irradiation conditions of the laser beam are not limited as long as the position where the arcuate fine groove 102 is planned to be formed on the three-dimensional display glass substrate 10 can be modified to be easily etched.

In this embodiment, the laser head irradiates a laser beam oscillated from a short pulse laser (for example, a picosecond laser or a femtosecond laser), and for example, a gas laser such as a CO ₂ laser or another type of laser or the like. May be used. In this embodiment, the output is controlled so that the average laser energy of the laser beam is about 10 μJ to 1000 μJ.

The modification line 104 formed at the planned formation position of the arcuate fine groove 102 is formed by a laser beam pulse (beam diameter is about 1 to 10 μm) irradiated from a pulse laser such as a picosecond laser or a femtosecond laser. It exhibits the shape of a filament array in which a plurality of filament layers are arranged.

The shape of the modification line 104 is not limited to a specific one as long as it has a property of being more easily etched than other parts of the three-dimensional display glass substrate 10.

It is preferable that the focusing region of the laser beam is adjusted as appropriate. Here, the depth of the arcuate fine groove 102 is adjusted by appropriately adjusting the condensing region of the laser beam.

After the reforming line 104 is formed by the above-mentioned laser processing, the reforming portion is melted more rapidly than other parts by the etching treatment, and as shown in FIG. 3C, the reforming line 104 is formed. The arc-shaped fine groove 102 is formed.

Here, the etching process in the present embodiment will be briefly described with reference to FIGS. 4 (A) and 4 (B). The above-mentioned three-dimensional display glass substrate 10 is subjected to an etching process by being introduced into the etching apparatus 50.

Here, for example, an etching treatment with an etching solution containing hydrofluoric acid, hydrochloric acid, or the like is performed. Usually, an etching solution containing about 1 to 10% by weight of hydrofluoric acid and about 5 to 20% by weight of hydrochloric acid is used, and a surfactant or the like is appropriately used in combination as necessary.

In the etching apparatus 50, while the glass substrate 10 for stereoscopic display is conveyed by the conveying roller, the etching solution is brought into contact with the main surface of the glass substrate 10 for stereoscopic display in the etching chamber 52 to etch the glass substrate 10 for stereoscopic display. Processing is done.

A cleaning chamber for washing away the etching solution adhering to the three-dimensional display glass substrate 10 is provided in the subsequent stage of the etching chamber 52 in the etching apparatus 50. Therefore, the three-dimensional display glass substrate 10 is discharged from the etching apparatus 50 in a state where the etching liquid is removed.

As described above, fine and smooth arcuate fine particles are appropriately performed by performing a modification treatment and an etching treatment by laser irradiation on the positions where the arcuate fine grooves 102 should be formed on the three-dimensional display glass substrate 10. The groove 102 can be realized. Moreover, a smooth surface with almost no scratches is formed on the surface of the arcuate fine groove 102.

As shown in FIGS. 4B and 5A, typical examples of the method of bringing the etching solution into contact with the three-dimensional display glass substrate 10 are the three-dimensional display glass substrate 10 in each etching chamber 52 of the etching apparatus 50. This is a single-wafer type and spray type etching process that sprays the etching solution.

However, the etching process is not limited to the spray-type etching process, and as shown in FIG. 5 (B), in the overflow type etching chamber 54, the glass substrate for stereoscopic display is brought into contact with the overflowed etching solution. It may be an overflow type etching process for transporting 10.

Further, as shown in FIG. 5C, dip-type etching is adopted in which a single or a plurality of three-dimensional display glass substrates 10 housed in a carrier are immersed in an etching tank 56 containing an etching solution. It is also possible.

By the above-mentioned etching process, the modification line 104 at the position where the arc-shaped fine groove 102 is planned to be formed is melted, and the arc-shaped fine groove 102 is formed. By the above-mentioned method, it is possible to form the arcuate fine groove 102 whose width is minimized to the limit. The width of the arcuate fine groove 102 can be appropriately adjusted in the range of about 5 μm to 500 μm.

In this embodiment, the width of the arcuate fine groove 102 is set to 500 μm or less in order to make it inconspicuous. In particular, when the width of the arc-shaped fine groove 102 is 100 μm or less, the arc-shaped fine groove 102 becomes almost invisible unconsciously.

The depth of the arcuate fine groove 102 is not limited to a specific range, but generally has the advantage that the brightness of the guide mark image 20 increases as the depth increases, while the arcuate fine groove 102 has a fine arcuate shape. There is a demerit that the groove 102 is easily visible. Therefore, it is advisable to appropriately set a suitable depth (generally, about 1 μm to 100 μm) according to the application of the touchless operation device 30.

Further, in order to further improve the production efficiency of the three-dimensional display glass substrate 10 described above, as shown in FIGS. 6 (A) and 6 (B), a glass base for multi-chamfering the three-dimensional display glass substrate 10. It is also possible to adopt a method of performing laser processing, etching, or the like on the material 200 and then dividing the material 200.

For example, as shown in FIG. 6A, the glass base material 200 in which a plurality of regions to be the three-dimensional display glass substrate 10 are arranged in a matrix of 4 rows × 4 columns is 16 sheets by the scribe break method. It can be divided into a three-dimensional display glass substrate 10.

Other than the scribe break method, it is also possible to divide by an etching process. When the glass base material 200 is divided by an etching treatment, it is preferable to cover both main surfaces (end faces if necessary) of the glass base material 200 with a protective film, remove the protective film at the portion corresponding to the cut portion, and then perform the etching treatment.

By using the three-dimensional display glass substrate 10 manufactured by the above method in the touchless operation device 30, various operation buttons can be made touchless (non-contact).

Specifically, the guide mark image 20 emerges from the three-dimensional display glass substrate 10 in the air, and the touchless operation can be easily performed while being guided by the guide mark image 20 in the air.

By realizing smooth touchless operation in this way, the touchless operation device 30 equipped with the three-dimensional display glass substrate 10 can be utilized as a touchless interface for preventing contact infection.

By making the door open / close switch and the lamp on / off switch in public spaces touchless, a high contact infection prevention effect can be expected. For example, by making various buttons such as elevators and washrooms that an unspecified number of people come into contact with touchless, the risk of being infected with an infectious disease can be reduced.

In particular, even when compared to the case where the interface is made touchless only by the sensor, it is easy to grasp which space the fingers should be moved by the guidance of the guidance mark image 20 floating in the air, so that men and women of all ages can be identified. Regardless, it is possible to realize an easy-to-use touchless interface.

By providing the glass substrate 10 for three-dimensional display and a plurality of fine and smooth arcuate fine grooves 102 on the transparent glass substrate as in the present embodiment, the aerial guide display of the desired guide mark is realized, and moreover, the circle. Since the arc-shaped fine groove 102 itself is almost invisible to the operator, the presence of the arc-shaped fine groove 102 does not impair the aesthetic appearance.

Since the three-dimensional display glass substrate 10 is made of glass having excellent chemical resistance, it does not deteriorate even if it is wiped with a disinfectant such as alcohol or sodium hypochlorite.

Moreover, since glass is generally more transparent than resin or the like, even when the three-dimensional display glass substrate 10 is used by being attached to a door or wall material, these aesthetics are not impaired.

Furthermore, even if the glass substrate 10 for stereoscopic display is attached to the representation of a glass mirror or a liquid crystal panel, the coefficient of thermal expansion is substantially the same as that of these glasses, so that distortion due to the difference in thermal expansion is unlikely to occur.

In the above-described embodiment, an example of manufacturing the three-dimensional display glass substrate 10 by a laser processing process and an etching process has been described, but the method for manufacturing the three-dimensional display glass substrate 10 is not limited thereto.

For example, as shown in FIGS. 7 (A) to 7 (D), a masking agent 106 having etching resistance is applied to the three-dimensional display glass substrate 10, and only the position where the arcuate fine groove 102 is formed is exposed. It is also possible to use a method in which the masking agent 106 is removed and then the etching process is performed.

As the masking agent 106, an acid-resistant resist, an acid-resistant film, or a metal mask such as a chrome mask or a tungsten mask may be appropriately used. Since the masking agent 106 needs to be peeled off as shown in FIG. 7 (D) after forming the arcuate fine groove 102, it is preferable to appropriately select the masking agent 106 in consideration of the peelability.

When such a masking agent 106 is used, wet etching as described above may be performed, but it is also possible to form arcuate fine grooves 102 by performing dry etching.

Here, since the brightness and depth of the guide mark image 20 change depending on the smoothness of the arcuate fine groove 102 after the etching process, the etching process conditions can be adjusted according to the desired specifications of the guide mark image 20. It is preferable to adjust the smoothness of the arcuate fine groove 102.

Further, in this embodiment, the call chime mark as shown in FIG. 8A is adopted as the guide mark image 20 for the touchless operation, but the configuration of the guide mark image 20 is not limited to this.

For example, a number indicating the floor of the elevator as shown in FIG. 8 (B) may be adopted as the guide mark image 20, or the Chinese character "call" of the call as shown in FIG. 8 (C) is guided. It may be adopted as the mark image 20.

In addition to these, a switch mark for switching the lighting on / off, various other characters, icons, pictograms, and the like can be used as the guide mark image 20.

Further, instead of displaying a single guide mark image 20, a plurality of types of guide mark images 20 are displayed at a plurality of positions at the same time, and the guide mark at that position is displayed according to the position where the operator's finger is detected. It is also possible to configure a touchless operation device 30 that performs processing corresponding to the image 20.

For example, the touchless operation device 30 can be used as an elevator operation device by making it possible to input the floor number by using 10 or more guide mark images 20.

In the above-described embodiment, the guide mark image 20 is made visible to the operator by using the transmitted light from the light source 12, but it is also possible to adopt a configuration in which not only the transmitted light but also the reflected light is used. be.

Further, as shown in FIG. 9A, the arcuate fine groove 102 of the three-dimensional display glass substrate 10 may be configured to be covered with the cover glass 108. At this time, the space formed by the cover glass 108 and the arcuate fine groove 102 may be filled with a filler (adhesive or the like) having a desired refractive index. For example, if a filler having a higher refractive index than glass is used, the same optical effect as when the convex portion is arranged in the groove portion can be obtained.

By using such a cover glass 108, it is possible to enhance the dustproof effect and the stain prevention effect of the arcuate fine groove 102. Therefore, it is possible to prevent the occurrence of a problem that the arcuate fine groove 102 cannot obtain directional light scattering over time.

Further, as shown in FIG. 9B, arcuate fine grooves 102 may be provided on both sides of the three-dimensional display glass substrate 10. When such a configuration is adopted, it becomes possible to arrange the arcuate fine grooves 102 more closely while preventing them from intersecting with each other. As a result, it is possible to reduce the number of places where the arcuate fine grooves 102 intersect, and it is possible to further reduce the occurrence of diffused reflection, so that the directivity can be improved.

Similarly, as shown in FIG. 9C, by stacking and arranging the three-dimensional display glass substrates 10, the arcuate fine grooves 102 are arranged more closely while preventing them from crossing each other. Will be possible. At this time, if the three-dimensional display glass substrate 10 is made ultra-thin, it is possible to increase the number of layers.

As shown in FIGS. 9B and 9C, when arcuate microgrooves 102 are provided on different planes, binocular parallax (motion parallax) in directions orthogonal to each other on the first surface and the second surface. May be provided so that the arcuate fine groove 102 may be provided.

By adopting such a configuration, it is possible to display a stereoscopic image having binocular parallax (movement parallax) in the vertical and horizontal directions. For example, not only a scene in which the viewpoint 40s of the left and right eyes are different in the left-right direction (horizontal direction), but also a scene in which the viewpoint 40s of the left and right eyes are different in the vertical direction (vertical direction) (example: a scene in which the face is tilted or lying down). ) Also, the operator can obtain a three-dimensional effect and see a three-dimensional image.

Further, as shown in FIG. 10A, the metal layer 110 may be provided at the bottom of the arcuate fine groove 102. By configuring such a metal layer 110 to reflect at least a part (for example, about 70%) of visible light, it is possible to make the observer visually recognize the stereoscopic image while reflecting the light applied from the outside. It will be possible.

Further, as shown in FIG. 10B, the metal layer 112 may be provided on the main surface opposite to the main surface provided with the arcuate fine groove 102 in the three-dimensional display glass substrate 10. Light that has passed through the metal layer 112 by being configured such that the metal layer 112 reflects a part of visible light and transmits the other part (for example, about 30% reflection and about 70% transmission). It becomes possible to make the observer visually recognize the stereoscopic image by. Such stereoscopic images usually tend to be observed more clearly than they are colored.

Examples of the method for forming the metal layers 110 and 112 described above include a vapor deposition process such as non-conductive vacuum metallization. However, the metal layers 110 and 112 can also be formed by other film forming treatments including electroless plating and coating.

Examples of the materials of the metal layers 110 and 112 include chromium, tungsten, and alloys thereof. Further, it is possible to preferably form the metal layers 110 and 112 by using an indium alloy or the like.

By transmitting and reflecting the light applied by the metal layers 110 and 112, as shown in FIG. 11, the stereoscopic display glass substrate 10 is applied as decorative glass of the mobile terminal device 90, and a colored logo mark or the like is applied. It becomes possible to make the observer visually recognize the stereoscopic image of.

When using transmitted light instead of reflected light, for example, by combining a louver sheet with a surface light source or a prism sheet or a light guide plate with a point light source, the light hitting condition is appropriately adjusted in FIG. 11. It becomes possible to form a stereoscopic image as shown in.

In the above-described embodiment, the arcuate fine groove 102 has been described as the fine groove for stereoscopic display (line engraving for image formation or image formation), but as shown in FIGS. 12A and 12B, the arcuate fine groove 102 has been described. It is possible to use the image line 105.

The image line 105 is basically configured by dividing the arcuate fine groove 102. By dividing the arc-shaped fine groove 102 in the horizontal direction and shifting the divided one in the vertical direction, there is an advantage in that the arc-shaped line engraving can be made compact in the rectangular frame. By arranging these in a grid pattern, it is possible to prevent the occurrence of intersections where selective irradiation is difficult. Further, since the image line 105 fits within the rectangular frame, it becomes easy to control the light distribution characteristics.

Such a picture line 105 increases the number of line engravings, and if it is attempted to be formed by a physical means such as a cutting plotter, the work becomes complicated, but it is relatively easy by using a chemical treatment such as etching. It becomes possible to form the image line 105.

The description of the embodiments described above should be considered exemplary in all respects and not restrictive. The scope of the invention is indicated by the claims, not by the embodiments described above. Furthermore, the scope of the invention is intended to include all modifications within the meaning and scope of the claims.

10-Glass substrate for 3D display 12-Light source 14-Sensor 20-Guide mark image 30-Touchless operation device 100-Guide mark formation area 102-Arc-shaped fine groove 110, 112-Metal layer

Claims (4)

It is a glass substrate for stereoscopic display configured to express a stereoscopic image using binocular parallax by the applied light.
It has a stereoscopic display area provided with a plurality of stereoscopic microgrooves arranged based on the shape of the image to be stereoscopically displayed.
The stereoscopic display region allows the observer to see the light applied to the plurality of stereoscopic microgrooves at a position away from the substrate surface by causing at least one of scattering, refraction, and reflection. It is configured to make the image visible , and
A glass substrate for three-dimensional display , wherein the fine groove for three-dimensional display has a metal layer at the bottom, and the metal layer is configured to reflect at least a part of visible light . It is a glass substrate for stereoscopic display configured to express a stereoscopic image using binocular parallax by the applied light.
It has a stereoscopic display area provided with a plurality of stereoscopic microgrooves arranged based on the shape of the image to be stereoscopically displayed.
The stereoscopic display region allows the observer to see the light applied to the plurality of stereoscopic microgrooves at a position away from the substrate surface by causing at least one of scattering, refraction, and reflection. It is configured to make the image visible , and
A metal layer is provided on the main surface opposite to the main surface provided with the three-dimensional display fine groove, and the metal layer is configured to reflect a part of visible light and transmit the other part. A glass substrate for stereoscopic display, which is characterized by being used. The glass substrate for three-dimensional display according to claim 1 or 2 , wherein the fine groove for three-dimensional display has an etching-treated surface inside. The glass substrate for stereoscopic display according to any one of claims 1 to 3 and the glass substrate for stereoscopic display.
A light source configured to irradiate the three-dimensional display glass substrate with light,
A detection means configured to detect the observer's movement to the position where the stereoscopic image is formed, and
A non-contact operating device equipped with at least.

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