JP2023002330A - Glass substrate for stereoscopic display and non-contact operation device with the same - Google Patents

Abstract

To provide a glass substrate for stereoscopic display that is inexpensive and enables an observer to view a stereoscopic image without increasing the number of components, and a non-contact operation device.SOLUTION: A glass substrate 10 for stereoscopic display is configured to show a stereoscopic image using binocular parallax with light impinging thereupon. This glass substrate 10 for stereoscopic display comprises a region 100 for stereoscopic display provided with a plurality of fine grooves for stereoscopic display (arcuate fine grooves 102) arranged based upon the shape of the image to be stereoscopically displayed. The region 100 for stereoscopic display is configured to at least one of scatter, refract and reflect light impinging on the plurality of fine grooves for stereoscopic display so as to let an observer view the stereoscopic image at a position distant from a substrate surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a stereoscopic display glass substrate that can be applied to an operation panel of a non-contact operation device, and a non-contact operation device having the same.

An operating device generally includes an operation panel for receiving a pressing operation by an operator, and outputs a signal corresponding to the operator's pressing operation on an operation button or guide mark on the operation panel to perform an operation. It operates the target electronic device. Conventionally, various developments have been made to improve the convenience and design of operation panels, and it can be said that operation devices have progressed.

However, in recent years, from the viewpoint of preventing the spread of infectious diseases due to contact infection, there has been a rapid increase in demand for touchless devices that enable non-contact operation.

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

JP-A-10-223102 JP 2012-194617 A

However, conventional touchless operation devices often require expensive imaging means such as gradient index lens elements, making it difficult to achieve touchless operation at low cost.

Even if the cost of the imaging means is reduced, a means for displaying the original picture of the guide mark for guiding the operation and a stereoscopic image reproduction means for stereoscopically viewing the original picture are provided. There is also the inconvenience that the number of parts increases because it is necessary.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stereoscopic display glass substrate and a non-contact operation device which are inexpensive and which enable an observer to 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 develop a stereoscopic vision image using binocular parallax by the applied light. Examples of stereoscopic images include guidance marks for operation guidance, images of character information, and images for improving aesthetics and visibility (decorative patterns, logo marks, etc.).

Such a stereoscopic display glass substrate is used, for example, in a non-contact operation device for guiding the position where the operator should place his or her hand. However, it is not limited to this use, and can be used for protective glass of portable terminals, decorative glass for the back surface, and the like.

This stereoscopic display glass substrate has a stereoscopic display region provided with a plurality of stereoscopic display fine grooves arranged based on the shape of an image to be stereoscopically displayed. The 3D display region scatters, refracts, and reflects light applied to the plurality of 3D display fine grooves, thereby providing a stereoscopic image to the observer at a position away from the substrate surface. is configured to be visible.

Normally, light applied to the fine grooves for stereoscopic display is scattered, refracted, or reflected with directivity in a plane perpendicular to the grooves. 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 of them may be used at the same time.

The light emitted from the light source to the three-dimensional display fine groove is scattered, refracted, reflected, etc. with directivity in the three-dimensional display fine groove, and becomes a bright point as an element constituting an image, and the left eye and the left eye of the observer. It suffices to reach the right eye as a left-eye image and a right-eye image, respectively. By generating such binocular parallax, the observer visually recognizes a stereoscopic image.

An example of a mechanism that allows an observer to visually recognize a stereoscopic image is the principle of a 3D display technology that uses directional light scattering called Arc 3D. is.

However, in the conventional arc 3D, it was said that it was difficult to put it into practical use by applying it to decoration of touchless operation panels and mobile terminal devices, but the present invention is suitable for practical use. .

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

In addition, the conventional arc 3D technology requires time and cost for processing to form arc-shaped flaws, making industrial application difficult. Moreover, if it is applied to the operation panel as it is, the arc-shaped scratches themselves will stand out, and there is a concern that the aesthetic appearance of the operation panel will be impaired, and no attempts have 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 this is successfully applied to a touchless operation panel and the like for practical use.

The fine grooves for stereoscopic display described above are inconspicuous grooves provided on a transparent glass substrate, and unlike scratches, the fine grooves themselves are hardly visible to the operator. Aesthetics are less likely to be impaired.

The three-dimensional display fine grooves preferably have an arc shape, but even a curved line partly containing an arc portion or a shape combining this with a straight line can exhibit a three-dimensional display function. In addition, even if the 3D display fine grooves are composed only of straight lines, the 3D display function itself is not lost even if the distance of the 3D displayed image becomes farther or the observation distance becomes longer. .

Examples of techniques for forming fine grooves for stereoscopic display in plate-like glass include etching such as wet etching and dry etching, and laser assisted etching using laser processing in combination with these. is not limited to

In the above-described configuration, expensive imaging means such as a gradient index lens element for forming an image of the guide mark for operation guidance in the air, stereoscopic image reproducing means for making the guide mark stereoscopically visible, etc. are separately provided. No need to set.

In the above configuration, it is preferable that the fine groove for stereoscopic display has an etching-processed surface inside. The etching-treated surface is a smooth surface obtained by chemical treatment such as etching (surface roughness is smaller than in the case of physical treatment). The presence of such an etched surface makes it possible to reduce the surface roughness of the glass to, for example, about 100 nm.

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

By providing such a metal layer, it becomes easier for an observer to visually recognize a stereoscopic image using reflection of light.

In addition, a metal layer is provided on the main surface opposite to the main surface on which the fine grooves for stereoscopic display are provided, and the metal layer is configured to reflect part of visible light and transmit other part thereof. preferably.

By adopting such a configuration, the light is colored when passing through the metal layer, so that a clearer stereoscopic image can be visually recognized by the observer.

Further, an operator's operating motion to a position where the above-mentioned glass substrate for stereoscopic display, a light source configured to irradiate the glass substrate for stereoscopic display with light, and an image of a guide mark are formed is detected. It is preferable to configure a non-contact operation device comprising at least a detection means configured as above.

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

According to the present invention, a stereoscopic display glass substrate and a non-contact operation device are realized that are inexpensive and that allow an observer to visually recognize a stereoscopic image without increasing the number of parts.

It is a figure showing a schematic structure of a touchless operation device concerning one embodiment of the present invention. It is a figure explaining the schematic structure of the glass substrate for stereoscopic displays. It is a figure which shows an example of the laser processing process in the manufacturing process of the glass substrate for stereoscopic displays. It is a figure which shows an example of the etching process in the manufacturing process of the glass substrate for stereoscopic displays. FIG. 10 is a diagram showing an example of a variation of the etching process in the manufacturing process of the glass substrate for stereoscopic display; It is a figure which shows the other example of the manufacturing process of the glass substrate for stereoscopic displays. It is a figure which shows the other example of the manufacturing process of the glass substrate for stereoscopic displays. FIG. 10 is a diagram showing an example of variations of guidance marks for operation guidance; FIG. 10 is a diagram showing an example of a variation of the configuration of the glass substrate for stereoscopic display; FIG. 4 is a diagram showing an example of a configuration in which a metal layer is provided on a glass substrate for stereoscopic display; It is a figure which shows the example which uses the glass substrate for stereoscopic displays for the back glass of a portable terminal device. FIG. 10 is a diagram showing another example of the configuration of fine grooves for stereoscopic display;

FIG. 1A schematically shows a touchless operation device 30 to which a stereoscopic display glass substrate according to one 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 the stereoscopic display glass substrate 10, the light source 12, the sensor 14, and a controller (not shown) that controls the operation of each part of the device.

The stereoscopic 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 can see the stereoscopic display glass substrate 10 away from the main surface. A stereoscopic display area 100 configured to show the guide mark image 20 at a position is provided.

In this embodiment, a call chime mark is employed as a guide mark to be displayed three-dimensionally (floating display). The guide mark image 20 is visible.

The light source 12 is configured to irradiate the stereoscopic display glass substrate 10 with highly directional light such as an LED unit, for example. The higher the directivity of the light from the light source 12, the brighter the luminescent spot pattern forming the guide mark image 20 looks. .

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 example of the configuration of the sensor 14 is an infrared sensor.

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

Here, the stereoscopic display area 100 described above will be described in more detail with reference to FIG. 1(B). The stereoscopic display area 100 has a plurality of arc-shaped fine grooves 102 (corresponding to the stereoscopic display fine grooves of the present invention) designed according to a predetermined rule based on the shape of the desired guide mark.

The three-dimensional display area 100 utilizes the light scattering properties of the plurality of arc-shaped fine grooves 102 to enable three-dimensional viewing of desired guide marks.

As shown in FIG. 1(C), this is based on the principle (so-called ARC 3D (arc 3D As the principle of 3D), many researchers, including Mr. W.T. Plummer in 1992, used the principle) under study.

Since the plurality of arc-shaped fine grooves 102 provided in the stereoscopic display area 100 have many portions in contact with the circle 70 shown in FIG. will be visible. However, even when linear stereoscopic display microgrooves are employed instead of the arc-shaped microgrooves 102, since the portions in contact with the circle 70 appear selectively bright, the stereoscopic display function itself is not lost.

In the so-called arc 3D display technology, a plurality of arc-shaped fine grooves 102 are provided in the stereoscopic display region of the stereoscopic display glass substrate 10, and illuminated by a light source 12 to form a stereoscopic image ( A guide mark image 20) can be presented.

Here, when light is incident on a plurality of arcuate microgrooves 102 and the light is scattered, refracted, or reflected with directivity in each of the arcuate microgrooves 102, the arcuate microgrooves 102 The light is radiated strongly in a conical direction from the head, and this enters the eyes of the operator at the position of the viewpoint 40 and is perceived as a bright spot.

A phenomenon is utilized in which the arc-shaped bright spot moves continuously along the arc as the position of the viewpoint 40 moves. Since the positions of the viewpoints 40 are different between the left and right eyes, images with different parallaxes are incident on the left and right eyes.

Next, the stereoscopic display area 100 described above will be described in more detail with reference to FIGS. 2(A) to 2(C). As shown in these figures, in the three-dimensional display area 100, each of the arc-shaped fine grooves 102 is formed by a plurality of points 80 forming a guide mark to be displayed three-dimensionally. It has an arc shape with a predetermined radius and a predetermined angle centered on points (pixels) arranged at predetermined intervals.

The distance between the plurality of points 80 forming the guide mark may be appropriately determined based on the realizable width of the arc-shaped fine groove 102 and the like. By arranging the points 80 with an interval of about 0.5 to 20 mm (usually about 0.5 to 1 mm), the guide mark image 20 with 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. 1(A) is affected by the size of the radius R of the arc-shaped fine groove 102 shown in FIG. 2(C).

For example, the greater the radius R, the greater the distance D (depth). Further, the distance D (depth) decreases as the angle (incidence angle) of the light emitted from the light source 12 with respect to the glass substrate 10 for stereoscopic display increases. Further, even if the position of the operator's viewpoint 40 is effectively changed left and right, the distance D (depth) hardly changes.

Next, an example of a method for manufacturing the stereoscopic display glass substrate 10 will be described with reference to FIGS. 3 to 5. FIG.

First, as shown in FIGS. 3(A) and 3(B), a laser beam is scanned at the position where the arc-shaped fine groove 102 is to be formed, which is determined by the shape of the desired guide mark, to form the fine groove. A 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 microgrooves 102 are to be formed on the glass substrate 10 for stereoscopic display can be modified to be easily etched.

In this embodiment, the laser head irradiates a laser beam oscillated from a short pulse laser ₍ e.g., picosecond laser, femtosecond laser). 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 modified line 104 formed at the position where the arc-shaped fine groove 102 is to be formed is formed by a laser beam pulse (with a beam diameter of about 1 to 10 μm) emitted from a pulse laser such as a picosecond laser or a femtosecond laser. It has the shape of a filament array in which a plurality of filament layers are arranged.

The shape of the modified line 104 is not particularly limited as long as it has a property of being more easily etched than other portions of the glass substrate for stereoscopic display 10 .

It is preferable that the condensing area of the laser beam is appropriately adjusted. Here, the depth of the arc-shaped fine groove 102 is adjusted by appropriately adjusting the condensing area of the laser beam.

After the modified line 104 is formed by the above-described laser processing, the modified portion is dissolved more quickly than other portions by the etching process, and as shown in FIG. 3C, the modified line 104 is formed. A circular fine groove 102 is formed.

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

Here, for example, an etching process is performed using an etchant containing hydrofluoric acid, hydrochloric acid, or the like. Usually, an etchant containing about 1 to 10% by weight of hydrofluoric acid and about 5 to 20% by weight of hydrochloric acid is used, and if necessary, a surfactant or the like is used in combination.

In the etching apparatus 50 , the 3D display glass substrate 10 is etched by bringing an etchant into contact with the main surface of the 3D display glass substrate 10 in the etching chamber 52 while the 3D display glass substrate 10 is being transported by the transport rollers. processing takes place.

A washing chamber for washing away the etchant adhering to the stereoscopic display glass substrate 10 is provided in the etching apparatus 50 in the subsequent stage of the etching chamber 52 . Therefore, the stereoscopic display glass substrate 10 is discharged from the etching device 50 in a state in which the etchant is removed.

As described above, the positions of the glass substrate for stereoscopic display 10 where the arc-shaped fine grooves 102 are to be formed are appropriately subjected to the modification treatment by laser irradiation and the etching treatment, thereby forming fine and smooth arc-shaped fine grooves. A groove 102 can be realized. Moreover, the surface of the arc-shaped fine groove 102 is formed as a smooth surface with almost no scratches.

A representative example of the technique of bringing the etching solution into contact with the glass substrate for stereoscopic display 10 is to etch the glass substrate for stereoscopic display 10 in each etching chamber 52 of an etching apparatus 50, as shown in FIGS. 4(B) and 5(A). This is a single-wafer and spray-type etching process in which an etchant is sprayed against the substrate.

However, the etching process is not limited to the spray type etching process, and as shown in FIG. An overflow-type etching process that transports 10 may also be used.

Furthermore, as shown in FIG. 5(C), dip etching is employed in which one or more stereoscopic display glass substrates 10 housed in a carrier are immersed in an etching tank 56 containing an etchant. is also possible.

By the etching process described above, the modified line 104 at the position where the arcuate microgroove 102 is to be formed is dissolved, and the arcuate microgroove 102 is formed. It is possible to form the arc-shaped fine groove 102 with the width minimized by the above-described technique. The width of the arc-shaped microgroove 102 can be appropriately adjusted within a range of approximately 5 μm to 500 μm.

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

The depth of the arc-shaped fine grooves 102 is not limited to a specific range, but generally there is an advantage that the brightness of the guide mark image 20 increases as the depth increases. There is a demerit that the groove 102 is easily visible. Therefore, it is preferable to 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 glass substrate for stereoscopic display 10 described above, as shown in FIGS. It is also possible to employ a method of subjecting the material 200 to laser processing, etching, or the like, and then dividing the material 200 .

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

Apart from the scribe-break method, it is also possible to divide by an etching process. When the glass base material 200 is cut by etching, it is preferable to coat both main surfaces (end surfaces if necessary) of the glass base material 200 with a protective film, remove the protective film from a portion corresponding to the cut portion, and then perform the etching.

By using the stereoscopic display glass substrate 10 manufactured by the above-described method in the touchless operation device 30, it is possible to make various operation buttons touchless (non-contact).

Specifically, the guide mark image 20 floats in the air from the glass substrate 10 for stereoscopic display, and it becomes possible to easily perform a touchless operation while being guided by the guide mark image 20 in the air.

By realizing smooth touchless operation in this manner, the touchless operation device 30 on which the glass substrate for stereoscopic display 10 is mounted can be utilized as a touchless interface for preventing contact infection.

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

In particular, compared to a touchless system using only a sensor, it is easy for people of all ages to grasp where to move their fingers through the guidance of the guide mark image 20 floating in the air. Regardless, a user-friendly touchless interface can be realized.

As in the present embodiment, by providing a transparent glass substrate with the glass substrate 10 for stereoscopic display and a plurality of fine and smooth arc-shaped fine grooves 102, a desired guide mark can be displayed as an aerial guide display. Since the arc-shaped fine grooves 102 themselves are almost invisible to the operator, the presence of the arc-shaped fine grooves 102 does not impair the appearance.

Since the glass substrate for stereoscopic display 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 generally has higher transparency than resin or the like, even when the stereoscopic display glass substrate 10 is attached to a door or wall material for use, the aesthetic appearance of these materials is not impaired.

Furthermore, even if the stereoscopic display glass substrate 10 is attached to a glass mirror or a liquid crystal panel surface, the coefficient of thermal expansion is almost the same as that of glass, so distortion due to the difference in thermal expansion is less likely to occur.

In the above-described embodiment, an example in which the glass substrate for stereoscopic display 10 is manufactured by laser processing and etching has been described, but the method for manufacturing the glass substrate for stereoscopic display 10 is not limited to this.

For example, as shown in FIGS. 7(A) to 7(D), a masking agent 106 having etchant resistance is applied to the glass substrate 10 for stereoscopic display, and only the formation positions of the arc-shaped fine grooves 102 are exposed. It is also possible to use a method of removing the masking agent 106 and then performing the etching process.

As the mask agent 106, an acid-resistant resist, an acid-resistant film, or a metal mask such as a chromium 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 arc-shaped fine grooves 102, it is preferable to select the masking agent 106 as appropriate in consideration of the peelability.

When using such a masking agent 106, wet etching as described above may be performed, but it is also possible to form the arc-shaped 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 arc-shaped fine grooves 102 after the etching process, the etching process conditions can be adjusted according to the specifications of the desired guide mark image 20. It is preferable to adjust the smoothness of the arc-shaped fine grooves 102 .

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

For example, as shown in FIG. 8(B), a number indicating the floor number of the elevator may be adopted as the guidance mark image 20, or as shown in FIG. It may be adopted as the mark image 20 .

In addition to these, it is possible to use, as the guide mark image 20, a mark of a switch for switching ON/OFF of illumination, and various other characters, icons, pictograms, and the like.

Furthermore, instead of 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, so that the guide mark at that position can be displayed according to the position at which the operator's fingers are detected. It is also possible to configure the touchless operating device 30 to perform 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 number of floors using ten or more guide mark images 20 .

In the above-described embodiment, the transmitted light from the light source 12 is used to make the guide mark image 20 visible to the operator. be.

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

By using such a cover glass 108, it is possible to enhance the dustproof effect and antifouling effect of the arc-shaped fine grooves 102. FIG. For this reason, it is possible to prevent the occurrence of a problem such that the scattering of light with directivity cannot be obtained over time in the arc-shaped fine grooves 102 .

Further, as shown in FIG. 9B, arc-shaped fine grooves 102 may be provided on both surfaces of the glass substrate 10 for stereoscopic display. By adopting such a configuration, it is possible to arrange the arc-shaped fine grooves 102 closer together while preventing the arc-shaped fine grooves 102 from crossing each other. As a result, it is possible to reduce the number of crossing points of the arc-shaped fine grooves 102, making it more difficult for irregular reflection to occur, so that directivity can be enhanced.

Similarly, as shown in FIG. 9(C), by stacking and arranging the glass substrates 10 for stereoscopic display, the arc-shaped fine grooves 102 are prevented from intersecting each other and arranged closer together. becomes possible. At this time, if the glass substrate for stereoscopic display 10 is made ultrathin, it is possible to increase the number of laminated layers.

As shown in FIGS. 9B and 9C, when the arc-shaped fine grooves 102 are provided on different planes, the binocular parallax (motion parallax) in the directions perpendicular to each other on the first plane and the second plane Circular fine grooves 102 may be provided so that

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

Furthermore, as shown in FIG. 10A, a metal layer 110 may be provided on the bottom of the arc-shaped fine groove 102 . By configuring such metal layer 110 to reflect at least a portion (for example, about 70%) of visible light, it is possible to allow an observer to visually recognize a stereoscopic image while reflecting light applied from the outside. be possible.

Further, as shown in FIG. 10B, a metal layer 112 may be provided on the main surface of the stereoscopic display glass substrate 10 opposite to the main surface on which the arc-shaped fine grooves 102 are provided. By configuring the metal layer 112 to reflect a part of visible light and to transmit the other part (for example, reflect about 30% and transmit about 70%), the light passing through the metal layer 112 It is possible to allow the observer to visually recognize the stereoscopic image. Such a stereoscopic image usually tends to be observed more clearly than colored.

Examples of techniques for forming the metal layers 110 and 112 described above include, for example, vapor deposition processes such as non-conductive vacuum metallization. However, it is also possible to form the metal layers 110 and 112 by other film forming processes including electroless plating and coating.

Materials for the metal layers 110 and 112 include chromium, tungsten, and alloys thereof. Also, the metal layers 110 and 112 can be suitably formed by using an indium alloy or the like.

By transmitting or reflecting the light applied by the metal layers 110 and 112, as shown in FIG. It is possible to allow the observer to visually recognize the stereoscopic image of .

When using transmitted light instead of reflected light, for example, a surface light source is combined with a louver sheet, or a point light source is combined with a prism sheet or a light guide plate to appropriately adjust the degree of light exposure. It is possible to form a stereoscopic image as shown in .

In the above-described embodiment, the arc-shaped fine grooves 102 were described as the fine grooves for stereoscopic display (lines for forming lines or images), but as shown in FIGS. A streak 105 can be used.

The streak 105 is basically formed by dividing the arc-shaped fine groove 102 . By dividing the arc-shaped fine groove 102 in the horizontal direction and shifting the divisions in the vertical direction, there is an advantage in that the arc-shaped line markings can be made compact within the rectangular frame. By arranging them in a grid pattern, it is possible to prevent the occurrence of intersections that are difficult to selectively irradiate. In addition, since the object line 105 fits within the rectangular frame, it becomes easier to control the light distribution characteristics.

Such lines 105 increase in the number of lines, and the work becomes complicated when trying to form them by physical means such as a cutting plotter. It becomes possible to form the streak 105 on the .

The description of the above-described embodiments should be considered illustrative in all respects and not restrictive. The scope of the invention is indicated by the claims rather than the above-described embodiments. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and range of equivalents of the claims.

10-Glass substrate for stereoscopic display 12-Light source 14-Sensor 20-Guidance mark image 30-Touchless operation device 100-Guidance mark formation area 102-Arcuate fine groove 110, 112-Metal layer

Claims (5)

A glass substrate for stereoscopic display configured to express a stereoscopic image using binocular parallax by applied light,
A stereoscopic display area provided with a plurality of fine grooves for stereoscopic display arranged based on the shape of an image to be stereoscopically displayed,
The 3D display region scatters, refracts, or reflects light applied to the plurality of 3D display fine grooves, thereby allowing an observer to view stereoscopically at a position away from the substrate surface. A glass substrate for stereoscopic display, characterized in that it is configured to allow an image to be visually recognized. 2. The glass substrate for stereoscopic display according to claim 1, wherein said fine groove for stereoscopic display has an etching-treated surface inside. 3. The stereoscopic display glass according to claim 1, wherein the microscopic groove for stereoscopic display has a metal layer on the bottom, and the metal layer is configured to reflect at least part of visible light. substrate. A metal layer is provided on the main surface opposite to the main surface on which the fine grooves for stereoscopic display are provided, and the metal layer reflects a part of visible light and transmits the other part. 3. The glass substrate for stereoscopic display according to claim 1, wherein the glass substrate is a glass substrate for stereoscopic display according to any one of claims 1 to 4;
a light source configured to irradiate the glass substrate for stereoscopic display with light;
detection means configured to detect an observer's movement to a position where the stereoscopically displayed image is formed;
A non-contact operating device comprising at least

Images