JP5243590B2 - Flat lighting unit - Google Patents

Description

  The present invention includes an incident end surface portion that guides light from a light source, a side surface portion that is connected to the incident end surface portion and a non-incident end surface portion that faces the incident end surface portion, and a surface portion that is orthogonal to the incident end surface portion and the side surface portion. A light reflection control unit that reflects light from the light source in the direction of the front surface portion, and collimated light that converts divergent light in the light guide plate into parallel light on the front surface portion. The light guide plate provided with the light condensing control unit to be emitted has a lattice-like positional relationship between the light reflecting control surface of the light reflection control unit on the back surface of the light guide plate and the light condensing control unit on the front surface part. The present invention relates to a flat illuminating device unit in which light emitted from a light condensing control unit can be obtained and matched with the size of an aperture of a light conversion body provided on a surface portion. Further, a light control sheet having a convex or concave surface is provided above the light converter, and the pitch between the light condensing control unit and the arc-shaped part of the light control sheet is made the same, so that the light condensing control unit and the light control are controlled. By matching the center position of the arc-shaped portion of the sheet, parallel light is supplied vertically to the aperture, and the light condensing control unit and the aperture correspond to each other so that the light can be efficiently transmitted. The present invention relates to a flat illuminating device unit that can be supplied to an aperture and can obtain bright emission light without color spots or bleeding. Furthermore, light emitted from the aperture can be reliably supplied to the center position of the arc-shaped portion of the light control sheet, and accurate information and viewing angle can be freely controlled, making it bright, clear, easy to see and beautiful for the eyes. The present invention relates to a flat illumination unit that can emit an image or the like.

  As a conventional flat illumination device, a reflective member is provided on the front surface portion and the back surface portion of the light guide plate, and a cutout portion that is a band-like slit is provided on either one, and the smaller the cutout portion is closer to the light source, the light source is a dot-like shape. In some cases, a method is known in which arc-shaped slits are provided centering on the light-emitting portion of the point light source so that the distance between the slits becomes narrower as the distance from the light source increases.

  Further, as a conventional flat illumination device, the light guide plate has a diffusion member on the front surface side, a reflection member on the back surface side, and a V-shaped cross section having a predetermined length on the reflection surface (back surface) of the light guide plate. V-shaped grooves are parallel to the light source and are arranged in a row with a predetermined interval between each other, and adjacent rows of each row are alternately arranged in a staggered pattern so that the interval gradually decreases as the distance from the light source increases. What to do is also known.

  Furthermore, as a conventional light guide plate, a large number of V-groove recesses that are reflected and refracted on the entire front and back surfaces are provided intermittently in a staggered or arcuate manner parallel to the incident direction, and between the recesses along the light traveling direction. There is known a structure in which a gap is provided in the gap so that the interval gradually decreases as the distance from the light source increases.

JP 62-109003 A Japanese Patent Laid-Open No. 5-216030 JP-A-8-286037

The above-described conventional flat illumination device is provided with a reflective member on the front surface portion and the back surface portion of the light guide plate, and provided with a notch portion that is a strip-shaped slit on one of them, and by making the notch portion closer to the light source, the light source is reduced. The amount of light leaking from the slit is controlled as it is closer to, so that the entire light is emitted uniformly. However, since the emitted light becomes a slit shape, the appearance is poor. In particular, near the light source, since the slit is small, it appears as a bright line. Moreover, since the light is close to the light source, there is a problem that the energy of the light is large and the emission line becomes stronger.
In addition, when the light source is point-like, an arc-shaped slit centered on the light-emitting portion of the point light source is provided, and the gap between the slits becomes narrower as the distance from the light source becomes larger. There is a problem that arc-like bright lines appear.

Furthermore, the conventional flat illumination device has a diffusing member on the front surface side of the light guide plate, a reflective member on the back surface side, and a V-shaped cross section having a predetermined length on the reflective surface (back surface) of the light guide plate. V-shaped grooves are parallel to the light source and are arranged in a row with a predetermined interval between each other, and adjacent rows of each row are alternately arranged in a staggered pattern so that the interval gradually decreases as the distance from the light source increases. Since the light incident on the light guide plate is reflected by the inclined surface of the V-shaped groove with respect to the traveling direction and deflected to the surface side, particularly strong emitted light is always emitted parallel to the light source. For this reason, for example, there is a problem that the luminance of the emitted light is lowered at both ends of the light source.
In particular, when the light source is a point light source, there are many cases where the luminance distribution is not uniform depending on the position from the light source.

In addition, the conventional light guide plate is provided with a number of V-groove recesses that are reflected and refracted on the entire front and back surfaces in a staggered or arcuate manner parallel to the incident direction, and between the recesses along the light traveling direction. A gap is provided so that the distance gradually decreases as the distance from the light source increases. Even if the distance gradually decreases as the distance from the light source increases, there is a problem that a large light guide plate is blocked by the depression.
Further, even when a large number of V-groove dents are intermittently provided in an arc shape with respect to the incident direction on the entire front and back surfaces, the central portion of the cathode ray tube is strong and uniform in the peripheral portion. Although the distribution is expected, since the parallel light from the cathode ray tube cannot be used in order to reflect the light from the central portion of the cathode ray tube, the light from the central portion of the cathode ray tube cannot be used in the oblique direction. Can be used, and the energy distribution is lower than that of the parallel light from the cathode ray tube, and the reflected light emission position (shape) is different (not uniform as a whole). There are challenges.

In addition, the conventional light guide plate is simply provided with various means for refracting or reflecting light on the front surface portion or the back surface portion, and this means has no relation between the front surface portion and the back surface portion. Therefore, there was a problem in using sufficient light.
For this reason, the conventional flat illumination device using such a light guide plate is unsatisfactory with respect to the luminance of light.

  Furthermore, in the liquid crystal display device using these light guide plates and flat illumination devices, the light emitted from the flat illumination device has a large amount of light from oblique directions or contains light components from oblique directions. It has been difficult to reproduce bleeding and clear RGB colors in the emitted light.

  In addition, since the liquid crystal display device using these light guide plates and flat illumination devices is simply a light conversion body placed above the light guide plates or flat illumination devices, it obtains the necessary amount of light for the liquid crystal panel. Therefore, it is necessary to widen the opening of each RGB pixel of the liquid crystal panel. For this reason, there has been a problem in resolving the contradiction between miniaturization of pixels for obtaining a pure screen and improvement in luminance.

(Object of invention)
The present invention has been made to solve the above-described problems, and includes at least a light source, an incident end surface portion that guides light from the light source, and the incident end surface portion and an anti-incident end surface portion facing the incident end surface portion. And a front surface portion and a back surface portion orthogonal to the incident end surface portion and the side surface portion, the front surface portion having inclined surface portions in opposite directions and an apex angle at which the inclined surface portions are connected to each other. A light condensing control unit that is provided in a range of 80 ° to 110 ° and performs condensing and refraction is arranged in parallel so as to extend or continue in a direction perpendicular to the incident end surface in the direction of the anti-incident end surface. The angle formed between the second inclined surface connecting the same inclined surface to the inclined surface that reflects in the surface portion direction parallel to the incident end surface portion and the anti-incident end surface portion is 120 ° to 170 °. A light reflection control unit consisting of a fine concave shape that reflects in the area is provided and incident. The direct light from the surface part is not emitted, only the light from the back part is reflected in the direction of the light condensing control part on the front surface part, and the light condensing control part refracts the light in a substantially vertical direction, and the spread of the exit cone is maximized. A light guide plate that emits sharp light within 20 ° from the center, and a light converter that controls the brightness and transmission time of light upward to receive the sharp emitted light of the outgoing cone from the surface portion, In order to obtain outgoing light that transmits the optimal light to the aperture of the converter, the back side is flat, the front side has a radius of curvature consisting of fine convex or concave arcs, and at the center of the arc part The pitch of the arc-shaped portion of the light control sheet that controls the viewing angle so that the incident light is refracted and condensed or spread is made equal to the pitch of the light condensing control portion, and the light condensing control portion and the arc-shaped center Make the arc-shaped part of the light control sheet parallel so that the position is almost the same A light control sheet is provided in parallel or in a matrix on the display surface of the light conversion body, arranged so that the light collection control portion and the aperture of the light conversion body are substantially paired, and from the light collection control portion It is an object of the present invention to provide a flat illuminating device unit in which accurate information and a viewing angle can be freely selected and light that is clear and bright and free from color spots or blurs can be obtained by matching the emitted light of the light beam with the aperture.

The flat illumination device unit according to claim 1 of the present invention includes a light source, an incident end surface portion that guides light of the light source, and a side surface portion that is connected to the incident end surface portion and the anti-incident end surface portion facing the incident end surface portion, A light guide plate having a front surface portion and a back surface portion orthogonal to the incident end surface portion and the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and above the light conversion body A light control sheet that refracts light, emits sharp light from the surface portion with respect to the aperture, and emits refracted light from the light control sheet.
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, and the light collection control unit refracts light in a substantially vertical direction to emit sharp light from the emission cone. The light collection control unit and the aperture are arranged so as to be substantially paired, and the emitted light from the light collection control unit matches the aperture.

The flat illumination device unit according to claim 1 includes a light source, an incident end surface portion that guides light from the light source, a side surface portion that is connected to the incident end surface portion and a counter-incident end surface portion that faces the incident end surface portion, and an incident end surface portion. And a light guide plate having a front surface portion and a back surface portion orthogonal to the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and refracting light above the light conversion body A planar illumination device unit that emits light from the surface portion, emits sharp light to the aperture, and emits refracted light from the light control sheet,
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, and the light collection control unit refracts light in a substantially vertical direction to emit sharp light from the emission cone. The light condensing control unit and the aperture are arranged so as to be substantially paired, and the light emitted from the light condensing control unit coincides with the aperture, so that most of the light guided into the light guiding plate is surely guided. The sharp light of the exit cone, which is narrowed by refracting light in a substantially vertical direction from the surface portion of the light, is emitted to the aperture of the light conversion body, and the light can be reliably supplied to the light conversion body and received by the light conversion body .

In addition, the flat illumination device unit according to claim 2 includes a light source, an incident end face part that guides light of the light source, a side face part that is connected to the incident end face part and an anti-incident end face part that faces the incident end face part, A light guide plate having a front surface portion and a back surface portion orthogonal to the end surface portion and the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and light above the light conversion body A planar illumination device unit that emits light from the surface portion that emits sharp light with respect to the aperture, and emits refracted light from the light control sheet.
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, the light collection control unit refracts the light in a substantially vertical direction, and emits the sharp light of the emission cone,
The light control sheet is flat on the back side where light is incident on the opposite side of the light converter receiving light, has a circular surface on the front side, and the light condensing control part and the center position of the circular part are approximately The light beams are provided so as to coincide with each other, and light incident on the center position of the arc-shaped portion is refracted from the arc-shaped portion into light that is condensed or spread.

The flat illumination device unit according to claim 2 includes a light source, an incident end surface portion that guides light of the light source, a side surface portion that is connected to the incident end surface portion and a counter-incident end surface portion that faces the incident end surface portion, and an incident end surface portion. And a light guide plate having a front surface portion and a back surface portion orthogonal to the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and refracting light above the light conversion body In the flat illumination device unit that emits light from the surface portion and emits sharp light to the aperture, and emits refracted light from the light control sheet.
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, the light collection control unit refracts the light in a substantially vertical direction, and emits the sharp light of the emission cone,
The light control sheet is flat on the back side where light is incident on the opposite side of the light converter receiving light, has a circular surface on the front side, and the light condensing control part and the center position of the circular part are approximately Since the light incident on the center position of the arc-shaped portion is refracted into light that is condensed or spread from the arc-shaped portion, most of the light guided into the light guide plate Sharp light from the exit cone, which is narrowed by refracting light in a substantially vertical direction from the surface, is emitted to the light conversion body, and the light from the light conversion body is reliably collected from the center position of the arc-shaped portion of the light control sheet. Alternatively, it is possible to emit light having a spread, and to obtain light that is bright and free from color spots and bleeding.

  Furthermore, the flat illumination device unit according to claim 3 is characterized in that the pitch of the arc-shaped portion of the light control sheet is equal to the pitch of the light condensing control portion.

  In the flat illumination device unit according to the third aspect, since the pitch of the arc-shaped portion of the light control sheet is equal to the pitch of the light collection control unit, the light collection control unit refracts light in a substantially vertical direction. The sharp light of the exit cone can be transmitted through the aperture of the light converter, and the spread light can be reliably emitted from the center position of the arcuate portion.

  The flat illumination device unit according to claim 4 is characterized in that the light control sheet has a radius of curvature that condenses or spreads the parallel light perpendicular to the flat back side by refracting the arc-shaped portion.

  In the flat illumination device unit according to the fourth aspect, the light control sheet has a radius of curvature that condenses or spreads the parallel parallel light from the flat back surface side by refracting the arc-shaped portion. It is possible to obtain outgoing light having a condensed light and a spread corresponding to the size and the intended viewing angle.

  Furthermore, the flat illuminating device unit which concerns on Claim 5 provides an arc-shaped part in parallel with the light control sheet | seat in parallel, or provided in a matrix form.

  The flat illumination device unit according to claim 5 corresponds to the aperture of the light conversion body and the light condensing control unit of the light guide plate because the arc-shaped portion is provided in parallel or in parallel with the light control sheet. can do.

  Further, in the flat illumination device unit according to claim 6, the light condensing control unit has inclined surface portions in opposite directions and the apex angle at which the inclined surface portions are connected is in the range of 80 ° to 110 °. Features.

  In the flat illumination device unit according to claim 6, since the light condensing control unit has the inclined surface portions in the opposite directions and the apex angle at which the inclined surface portions are connected is in the range of 80 ° to 110 °, the light guide plate It is possible to refract the reflected light from the light reflection control portion on the back surface portion of the back surface portion from the front surface portion in a substantially vertical direction and emit sharp light from the exit cone.

  Furthermore, the flat illumination device unit according to claim 7 is characterized in that the emission cone of the light condensing control unit has a maximum spread within 20 ° from the center.

  The flat illumination device unit according to claim 7 has an exit cone that is refracted in a substantially vertical direction with respect to the aperture of the light conversion body because the exit cone of the light condensing control unit is at most 20 ° from the center. The sharp light can be supplied.

  Further, the flat illumination device unit according to claim 8 is characterized in that the light condensing control unit is provided in parallel so as to extend in a direction perpendicular to the incident end surface portion or in a direction opposite to the incident end surface portion.

  In the flat illumination device unit according to the eighth aspect of the invention, the light condensing control unit is provided in parallel so as to extend or continue in a direction perpendicular to the incident end surface portion in the direction opposite to the incident end surface portion. A plurality of substantially vertical light beams in a rectangular shape are refracted from the incident end surface portion to the non-incident end surface portion at a position corresponding to the arc-shaped portion of the light control sheet, and the sharp light of the exit cone is arranged in parallel or in a substantially rectangular shape. Light in a substantially vertical direction can be refracted in the form of a matrix to emit light with a sharp exit cone.

  Furthermore, the flat illumination device unit according to claim 9 is provided with the light reflection control unit provided in parallel to the incident end surface portion and the anti-incident end surface portion, and the same reflection inclined surface as the reflection inclined surface that reflects in the surface portion direction. The angle formed with the second inclined surface to be connected is in the range of 120 ° to 170 °.

  In the flat illumination device unit according to claim 9, the light reflection control unit is provided in parallel to the incident end surface portion and the anti-incident end surface portion, and is connected to the same reflective inclined surface as the reflective inclined surface that reflects in the surface portion direction. Since the angle formed with the second inclined surface is in a range of 120 ° to 170 °, the light guided into the light guide plate from the incident end surface portion is inclined toward the surface portion in the inclined surface from the vicinity of the incident end surface portion to the vicinity of the non-incident end surface portion. Can be reflected.

  Further, in the flat illumination device unit according to claim 10, as the light condensing control unit proceeds from the incident end surface portion to the non-incident end surface portion, the apex angle to which the inclined surface portion is connected is reduced from 110 ° to 80 ° or the apex. It is characterized in that the height of the corner is increased.

  In the flat illumination device unit according to claim 10, as the light condensing control unit proceeds from the incident end surface portion to the non-incident end surface portion, the apex angle to which the inclined surface portion is connected decreases from 110 ° to 80 ° or the apex angle increases. Since the height increases, especially when the length from the incident end surface portion to the non-incident end surface portion of the light guide plate is long, the light reflection control unit on the back surface portion increases as the light from the light source approaches the anti-incident end surface portion. Since the reflected light to be reflected has a large reflection angle with respect to the surface portion direction, the refraction angle from the light condensing control portion on the surface portion can be made constant.

  Furthermore, the flat illumination device unit according to claim 11 is characterized in that the length of the reflection inclined surface of the light reflection control unit is equal to or slightly longer than the pitch of the light collection control unit.

  In the flat illumination device unit according to the eleventh aspect, the length of the reflection inclined surface of the light reflection control unit is equal to or slightly longer than the pitch of the light collection control unit. When the pitch width of the control part is viewed from the surface part direction, it becomes a lattice shape.

  According to a twelfth aspect of the present invention, there is provided a flat illumination device unit including a prism sheet having an apex angle directed toward the light guide plate at an upper portion of the surface portion of the light guide plate.

  Since the planar illumination device unit according to claim 12 includes a prism sheet having an apex angle in the direction of the light guide plate at the upper portion of the surface portion of the light guide plate, in particular, the length from the incident end surface portion to the anti-incident end surface portion of the light guide plate. Is longer, the closer the light from the light source is to the anti-incident end face part, the larger the reflection angle of the reflected light reflected by the light reflection control part on the back part with respect to the surface part direction. The increase in the refraction angle from the light control unit can be controlled to be in the vertical direction.

As described above, the flat illumination device unit according to claim 1 includes the light source, the incident end surface portion that guides light of the light source, and the side surface portion connected to the incident end surface portion and the anti-incident end surface portion facing the incident end surface portion. A light guide plate having a front surface portion and a back surface portion orthogonal to the incident end surface portion and the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and a light conversion body A planar illumination device unit that includes a light control sheet that refracts light upward, emits sharp light from the surface portion to the aperture, and emits refracted light from the light control sheet;
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, and the light collection control unit refracts light in a substantially vertical direction to emit sharp light from the emission cone. The light condensing control unit and the aperture are arranged so as to be substantially paired, and the light emitted from the light condensing control unit coincides with the aperture, so that most of the light guided into the light guiding plate is surely guided. The sharp light of the exit cone, which is narrowed by refracting light in a substantially vertical direction from the surface portion of the light, is emitted to the aperture of the light conversion body, and the light can be reliably supplied to the light conversion body and received by the light conversion body .
Therefore, it is possible to reproduce accurate information and a viewing angle suitable for the purpose, and it is possible to obtain a beautiful image that is clear and easy to see and is easy on the eyes.

The flat illumination device unit according to claim 2 includes a light source, an incident end surface portion that guides light of the light source, a side surface portion that is connected to the incident end surface portion and a counter-incident end surface portion that faces the incident end surface portion, and an incident end surface portion. And a light guide plate having a front surface portion and a back surface portion orthogonal to the side surface portion, a light conversion body having a plurality of fine apertures for receiving light from the front surface portion, and refracting light above the light conversion body In the flat illumination device unit that emits light from the surface portion and emits sharp light to the aperture, and emits refracted light from the light control sheet.
The front surface is provided with a light condensing control unit consisting of a fine convex shape that refracts, and the back surface is provided with a light reflection control unit consisting of a fine concave shape that reflects light, and direct light from the incident end surface portion is provided on the back surface portion. Is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, the light collection control unit refracts the light in a substantially vertical direction, and emits the sharp light of the emission cone,
The light control sheet is flat on the back side where light is incident on the opposite side of the light converter receiving light, has a circular surface on the front side, and the light condensing control part and the center position of the circular part are approximately Since the light incident on the center position of the arc-shaped portion is refracted into light that is condensed or spread from the arc-shaped portion, most of the light guided into the light guide plate Sharp light from the exit cone, which is narrowed by refracting light in a substantially vertical direction from the surface, is emitted to the light conversion body, and the light from the light conversion body is reliably collected from the center position of the arc-shaped portion of the light control sheet. Alternatively, it is possible to emit light having a spread, and to obtain light that is bright and free from color spots and bleeding.
Therefore, a viewing angle suitable for the purpose can be reproduced, and a beautiful image that is clear, easy to see and gentle to the eyes can be obtained.

In the flat illumination device unit according to the third aspect, since the pitch of the arc-shaped portion of the light control sheet is equal to the pitch of the light collection control unit, the light collection control unit refracts light in a substantially vertical direction. The sharp light of the exit cone can be transmitted through the aperture of the light converter, and the spread light can be reliably emitted from the center position of the arcuate portion.
Therefore, a wide variety of information and images can be emitted, and emission light that is bright and free from color spots and blurring can be obtained.

In the flat illumination device unit according to the fourth aspect, the light control sheet has a radius of curvature that condenses or spreads the parallel parallel light from the flat back surface side by refracting the arc-shaped portion. It is possible to obtain outgoing light having a condensed light and a spread corresponding to the size and the intended viewing angle.
Therefore, it can support different types of light converters, and can output a wide variety of information such as images that are difficult to see externally such as personal use and images that are easy to see externally from various angles at various positions. At the same time, it can meet a wide variety of requirements.

The flat illumination device unit according to claim 5 corresponds to the aperture of the light conversion body and the light condensing control unit of the light guide plate because the arc-shaped portion is provided in parallel or in parallel with the light control sheet. can do.
Therefore, light can be supplied accurately and reliably to the light converter, and the transmitted light can be reliably obtained from the light converter, and a bright, clear and easy-to-view beautiful image free from color spots and bleeding can be obtained.

In the flat illumination device unit according to claim 6, since the light condensing control unit has the inclined surface portions in the opposite directions and the apex angle at which the inclined surface portions are connected is in the range of 80 ° to 110 °, the light guide plate It is possible to refract the reflected light from the light reflection control portion on the back surface portion of the back surface portion from the front surface portion in a substantially vertical direction and emit sharp light from the exit cone.
Therefore, light perpendicular to the aperture of the light converter can be supplied.

The flat illumination device unit according to claim 7 has an exit cone that is refracted in a substantially vertical direction with respect to the aperture of the light conversion body because the exit cone of the light condensing control unit is at most 20 ° from the center. The sharp light can be supplied.
Therefore, it is possible to reliably obtain outgoing light that is bright in transmitted light and free from color spots and blurring from the light converter.

In the flat illumination device unit according to the eighth aspect of the invention, the light condensing control unit is provided in parallel so as to extend or continue in a direction perpendicular to the incident end surface portion in the direction opposite to the incident end surface portion. A plurality of substantially vertical light beams in a rectangular shape are refracted from the incident end surface portion to the non-incident end surface portion at a position corresponding to the arc-shaped portion of the light control sheet, and the sharp light of the exit cone is arranged in parallel or in a substantially rectangular shape. Light in a substantially vertical direction can be refracted in the form of a matrix to emit light with a sharp exit cone.
Therefore, sharp light can be reliably emitted to the aperture of the light converter.

In the flat illumination device unit according to claim 9, the light reflection control unit is provided in parallel to the incident end surface portion and the anti-incident end surface portion, and is connected to the same reflective inclined surface as the reflective inclined surface that reflects in the surface portion direction. Since the angle formed with the second inclined surface is in a range of 120 ° to 170 °, the light guided into the light guide plate from the incident end surface portion is inclined toward the surface portion in the inclined surface from the vicinity of the incident end surface portion to the vicinity of the non-incident end surface portion. Can be reflected.
Therefore, light can be efficiently guided to the light collection controller on the surface.

In the flat illumination device unit according to claim 10, as the light condensing control unit proceeds from the incident end surface portion to the non-incident end surface portion, the apex angle to which the inclined surface portion is connected decreases from 110 ° to 80 ° or the apex angle increases. Since the height increases, especially when the length from the incident end surface portion to the non-incident end surface portion of the light guide plate is long, the light reflection control unit on the back surface portion increases as the light from the light source approaches the anti-incident end surface portion. Since the reflected light to be reflected has a large reflection angle with respect to the surface portion direction, the refraction angle from the light condensing control portion on the surface portion can be made constant.
Therefore, it is possible to emit the sharp light of the exit cone that is narrowed by refracting light uniformly and substantially vertically from the entire surface portion.

In the flat illumination device unit according to the eleventh aspect, the length of the reflection inclined surface of the light reflection control unit is equal to or slightly longer than the pitch of the light collection control unit. When the pitch width of the control part is viewed from the surface part direction, it becomes a lattice shape.
For this reason, the reflected light width of the light reflection control unit is equal to the pitch width of the light collection control unit, and a substantially rectangular emission light can be obtained from the light collection control unit.

Since the planar illumination device unit according to claim 12 includes a prism sheet having an apex angle in the direction of the light guide plate at the upper portion of the surface portion of the light guide plate, in particular, the length from the incident end surface portion to the anti-incident end surface portion of the light guide plate. Is longer, the closer the light from the light source is to the anti-incident end face part, the larger the reflection angle of the reflected light reflected by the light reflection control part on the back part with respect to the surface part direction. The increase in the refraction angle from the light control unit can be controlled to be in the vertical direction.
Therefore, the light can be refracted in a direction substantially perpendicular to the aperture of the light converter, and the sharp light of the exit cone can be emitted.

It is a general | schematic disassembled perspective view of the plane illuminating device unit which concerns on this invention. It is a schematic perspective view which shows an example of the light-guide plate of the plane illuminating device unit which concerns on this invention. It is a schematic perspective view which shows the other example of the light-guide plate of the plane illuminating device unit which concerns on this invention. (A) It is a schematic perspective view which shows the light condensing control part and output cone | corn of the light-guide plate of FIG. (B) It is an enlarged view of the light condensing control part of FIG. (A) It is a schematic perspective view which shows the light condensing control part and output cone | corn of the light-guide plate of FIG. (B) It is the enlarged view of the light condensing control part and the radiation | emission cone seen from the X direction of (a). (C) It is an enlarged view of the light condensing control part and the radiation | emission cone seen from the Y direction of (a). It is a schematic perspective view which shows an example of the light control sheet | seat of the plane illuminating device unit which concerns on this invention. It is a schematic perspective view which shows the other example of the light control sheet | seat of the plane illuminating device unit which concerns on this invention. (A) It is a schematic perspective view which shows the other example of the light control sheet | seat of the plane illuminating device unit which concerns on this invention. (B) It is a top view of (a). (C) It is the side view seen from the Y direction of (a). (D) It is the side view seen from the X direction of (a). (A) It is a schematic perspective view which shows the other example of the light control sheet | seat of the plane illuminating device unit which concerns on this invention. (B) It is a top view of (a). (C) It is the side view seen from the Y direction of (a). (D) It is the side view seen from the X direction of (a). (A) It is the elements on larger scale of the light control sheet | seat of FIG. (B) It is the elements on larger scale of the light control sheet | seat of FIG. (A) It is a figure which shows an example of the relationship between the light condensing control part in the planar illuminating device unit which concerns on this invention, a light beam, a light converter, and a light control sheet. (B) It is a figure which shows the other example of the relationship between the light condensing control part in the plane illuminating device unit which concerns on this invention, a light beam, a light converter, and a light control sheet. It is the elements on larger scale of the prism sheet of the plane illuminating device unit which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
The present invention has a basic configuration of a light source, a light guide plate, a reflector, a light converter, and a light control sheet. The light from the light source is refracted from the surface portion in a substantially vertical direction and is narrowed down. In order to emit the sharp light of the exit cone whose spread is maximum and within 20 ° from the center, a light reflection control unit composed of a fine concave shape that reflects on the back surface portion of the light guide plate is provided to the incident end surface portion and the anti-incident end surface portion. Are provided in a range of 120 ° to 170 ° with the second inclined surface connected to the reflecting inclined surface that is reflected in the direction of the surface portion and connected to the reflecting inclined surface, and the virtual horizontal plane perpendicular to the incident end surface portion 7 and the reflecting inclined surface When the angle formed by and is 6 ° or more, the light is positively emitted to the outside of the back surface portion, and the light is returned again into the light guide plate by the case made of a reflector. In addition, when the angle formed by the virtual horizontal plane perpendicular to the incident end face portion 7 and the reflection inclined surface is within 6 °, all of the light travels in the direction of the surface portion without being emitted from the back surface portion. In addition, a light condensing control portion having a fine convex shape that refracts is provided on the surface portion of the light guide plate in parallel so as to extend in a direction perpendicular to the incident end surface portion or in a direction opposite to the incident end surface portion. The condensing control unit has inclined surface portions (two or four surfaces) in opposite directions, and the apex angle at which the inclined surface portions are connected is in the range of 80 ° to 110 °, and the exit cone from the light condensing control portion. The light condensing control unit refracts the reflected light from the light reflection control unit in a substantially vertical direction from the surface part without emitting the direct light from the incident end face part. Sharp light from the exit cone can be emitted.
Further, as the light condensing control unit is advanced from the incident end surface portion to the non-incident end surface portion, the apex angle to which the inclined surface portion is connected is reduced from 110 ° to 80 ° or the height of the apex angle is increased. When the length from the incident end surface portion to the anti-incident end surface portion is long, the light reflected from the light reflection control unit on the back surface is reflected toward the surface portion as the light from the light source approaches the anti-incident end surface portion. Since the reflection angle is large, the refraction angle of the light condensing control unit on the surface can be made constant, and the sharp light of the exit cone that is refracted from the entire surface uniformly by refracting light in a substantially vertical direction is emitted. can do.
Furthermore, since the length of the reflection inclined surface of the light reflection control unit is equal to or slightly longer than the pitch of the light collection control unit, the reflection width of the light reflection control unit and the pitch width of the light collection control unit are the surface portion. When viewed from the direction, it becomes a lattice shape, and the reflected light width of the light reflection control unit is equal to the pitch width of the light collection control unit, so that a substantially rectangular or square-shaped emitted light is obtained from the light collection control unit. Can do.
A light converter that refracts light in such a substantially vertical direction and is controlled above the sharp light of the exit cone is provided, and the light condensing control unit and the aperture of the light converter are substantially paired with the light converter. By aligning the light emitted from the light condensing control unit with the aperture, most of the light guided into the light guide plate is reliably refracted from the surface portion of the light guide plate in a substantially vertical direction. By emitting the sharp light of the exit cone narrowed down to the aperture of the light conversion body and supplying light perpendicular to the aperture of the light conversion body, accurate information from the light conversion body and from the light conversion body The transmitted light can be bright and free from color spots and bleeding.
Further, above the light conversion body, the back surface side is flat, and arc-shaped portions having a radius of curvature that refracts and expands parallel parallel light from the back surface side are arranged in parallel in parallel to the front surface side. A light control sheet provided in a matrix is provided.
Therefore, the light from the aperture of the light conversion body can be obtained as emission light having a condensed or spread, and the emission light corresponding to the size of the aperture of the light conversion body and the intended viewing angle can be obtained, The transmitted light from the light converter is bright and there are no color spots or blurring, and the viewing angle can be controlled. It is possible to obtain beautiful images and information that are clear and easy to see, and are compatible with different types of light converters. Thus, it is possible to emit a variety of information and images, such as images that are difficult to see to the outside and images that are easy to see from all angles at various positions, and can meet a variety of requirements.
Furthermore, by making the pitch of the arc-shaped part of the light control sheet equal to the pitch of the light condensing control part, light conversion of the sharp light of the exit cone refracted light in the substantially vertical direction by the light condensing control part It can transmit through the aperture of the body and reliably emit light that is condensed or spread from the center position of the arcuate part, and obtain a wide variety of information and emitted light such as images that are bright and free from color spots and bleeding Can do.
However, according to the present invention, the sharp light of the exit cone from the light guide plate is accurately supplied to the aperture, and the light transmitted through the aperture can be emitted by the light control sheet as condensed light or spread light. An object of the present invention is to provide a flat illumination device unit that can realize a clear, easy-to-see and beautiful image that is easy to see and has no blur and has a controlled viewing angle, and can accurately transmit a wide variety of information.

  As shown in FIG. 1, the flat illumination device unit of this example is provided with a light conversion body 3 on a flat illumination device comprising a light source 6 and a light guide plate 2, and further provided with a light control sheet 4 above it. It is stored in the case 5.

The case 5 is made of a material in which a white material such as titanium oxide is mixed in a thermoplastic resin or a material in which a metal such as aluminum is deposited on a thermoplastic resin or a metal foil is laminated, and only as an upward reflection again as a completely reflected light. Is returned to the light guide plate 2.
For this reason, the light leaked to the case inner portions 5b and 5c other than the bottom portion 5a of the case 5 is extraneous light regardless of the upper side of the light guide plate 2, and therefore, the light is incident on the case inner portion 5b and the case inner portion 5c. In order to absorb light, for example, carbon such as black may be applied, or a reflective material may be laid on the bottom 5a of the case 5 colored by kneading into a resin.
Further, two-color molding may be performed with a resin having light reflectivity and a resin having light absorption on the bottom 5a.
Further, the case 5 may have a reflecting surface of the bottom portion 5a having a concavo-convex shape or a prism shape, and the reflected light may be converted into scattered light to be uniform reflected light.
In addition, although the case 5 can be easily assembled by installing the flat illumination device, the light conversion body, the light control sheet, etc. by making the case shape, the case 5 is not made into the case shape, but the light is applied to the light guide plate 2. It is sufficient if there is a reflection element for the purpose of returning the signal again.

The light source 6 is an array of semiconductor light emitting elements composed of integrated red light emission (R), green light emission (G), and blue light emission (B), a single color light emitting semiconductor light emitting element of these semiconductor light emitting elements, and a single color light emitting semiconductor light emitting element. A quasi-white semiconductor light emitting device using a blue light emitting semiconductor light emitting device and a fluorescent material.
Moreover, it consists of CCFL (cold cathode fluorescent discharge tube) and HCFL (hot cathode fluorescent discharge tube).
Depending on the size of the light guide plate 2 and the like, the light sources 6 may be provided on both ends (incident end face portion 7 and anti-incident end face portion 8).

  The light guide plate 2 has a colorless and transparent acrylic resin (PMMA), cyclic olefin / copolymer (COC), polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN) having a refractive index of about 1.4 to 1.7. ), Polyethersulfone (PES) or the like. As shown in FIGS. 2 and 3, the light guide plate 2 has an incident end surface portion 7 whose outer shape guides light from the light source 6, an anti-incident end surface portion 8 that faces the incident end surface portion 7, and an incident end surface portion 7 that is anti-incident. It is formed in a rectangular shape including a side surface portion 9 connected to the end surface portion 8, an incident end surface portion 7, a non-incident end surface portion 8, and a front surface portion 10 and a back surface portion 11 orthogonal to the side surface portion 9.

The light incident on the light guide plate 2 travels in the light guide plate 2 in a range where the refraction angle γ satisfies the expression 0 ≦ | γ | ≦ Sin ⁻¹ (1 / n), and is used for, for example, a general light guide plate 2. Since the refractive index of the acrylic resin, which is a resin material, is about n = 1.49, the refraction angle γ refracted at the incident end face 7 is in the range of about γ = 0 to ± 42 °.

  Further, the light incident on the light guide plate 2 within the range of the refraction angle γ = 0 to ± 42 ° is Sin α = (1 / n) at the boundary surface between the light guide plate 2 and the air layer (refractive index n = 1). ) Can be used to express the critical angle. For example, since the refractive index of acrylic resin, which is a resin material used for the general light guide plate 2, is about n = 1.49, the critical angle α is about α = 42 °. Therefore, when the front surface portion 10 and the back surface portion 11 of the light guide plate 2 are flat surfaces, there is no convex or concave portion having a large inclination angle that deflects the light beam, or the critical angle α is not exceeded. The light travels from the incident end face 7 toward the opposite incident end face 8 in the opposite direction while being totally reflected by the front face 10 and the back face 11.

  As shown in FIGS. 2 and 3, the back surface portion 11 is provided with a plurality of light reflection control portions 16 of the light guide plate 2 in parallel to the incident end surface portion 7 and the anti-incident end surface portion 8.

The light reflection control unit 16 is connected to the reflection inclined surface 17a that is inclined in the direction of the incident end surface portion 7 and reflected in the direction of the surface portion 10, and the second reflection inclined surface 17a, and is inclined in the direction of the non-incident end surface portion 8a. The angle θ2 formed by the inclined surface 17b and the reflecting inclined surface 17a and the second inclined surface 17b is provided in the range of θ2 = 130 ° to 160 °.
In addition, when the angle formed by the virtual horizontal plane perpendicular to the incident end surface portion 7 and the reflection inclined surface 17a is within 6 °, light does not leak from the back surface portion 11 of the light guide plate 2, but as the angle increases. Light leakage from the back surface portion 11 increases.
For this reason, depending on the size and purpose of the light guide plate 2, the light should be within 6 ° when no light is leaked from the back surface portion 11 of the light guide plate 2. It is also possible to use it and return it to the light guide plate 2 again.

  Therefore, the light incident on the light guide plate 2 travels in the direction of the refraction angle γ = 0 to −42 ° toward the back surface portion 11, and the incident light is totally reflected from the incident end surface portion 7 to the anti-incident end surface portion 8. The light is totally reflected by the inclined surface 17a and proceeds in the direction of the surface portion 10.

  As shown in FIG. 2, the surface portion 10 is provided with a light condensing control portion 10 a extending in a direction perpendicular to the incident end surface portion 7 of the light guide plate 2 in the direction opposite to the incident end surface portion 8.

The light condensing control unit 10a has two inclined surface portions 12 and inclined surface portions 13 that are inclinedly connected in opposite directions to the side surface portion 9, and the apex angle θ1 at which the inclined surface portions 12 and 13 are connected is θ1 = 80. It is provided in the range of ° to 110 °.
In this case, the light incident on the light guide plate 2 travels in the range of the refraction angle γ = 0 to + 42 ° toward the surface portion 10. Then, in the light incident on the light guide plate 2 and having a large incident angle (near + 42 °), the shoreline portion of the light collection control unit 10a is large along the light guide plate 2. Light at the exit angle is slightly emitted.
Further, the inclined surface portion 12 and the inclined surface portion 13 of the light condensing control unit 10a are refracted further toward the inclined surface portion 12 side and the inclined surface portion 13 side, and light at a large emission angle along the light guide plate 2 is slightly emitted. .

  Thus, in the light condensing control part 10a, the light which went to the surface part 10 direction of the light-guide plate 2 leaks very little, and the light reflection control part 16 of the back surface part 11 (total reflection light by the reflective inclined surface 17a). ) (Reflected light parallel to the incident end face portion 7 and the anti-incident end face portion 8).

  As shown in FIG. 4A and FIG. 4B, the light condensing control unit 10a is connected to the inclined surface portion 12 and the inclined surface portion 13 so that the apex angle θ1 is in the range of θ1 = 80 ° to 110 °. Light totally reflected by the reflection inclined surface 17a of the reflection control unit 16, reflected light parallel to the incident end surface portion 7 and the anti-incident end surface portion 8 (reflected light from a direction substantially perpendicular to the extending direction of the light collection control unit 10a) Is refracted by the inclined surface portion 12 and the inclined surface portion 13 and condensed toward the both side surface portion 9 direction side, and the emission cone has a maximum spread in the substantially vertical direction from the surface portion 10 and the sharp light of the emission cone within δ = 20 ° from the center. The light can be emitted to the outside.

  Further, as shown in FIG. 3, the surface portion 10 ′ is juxtaposed so as to be connected to the light incident control surface 10 b in the direction of the light incident control surface 10 b in a direction perpendicular to the incident end surface portion 7 of the light guide plate 2. Provided.

The light condensing control unit 10b includes two inclined surface portions 12 and inclined surface portions 13 that are inclinedly connected to the side surface portion 9 in opposite directions, and two inclined surfaces that are inclinedly connected to the incident end surface portion 7 direction and the anti-incident end surface portion 8 direction. It has a quadrangular pyramid shape composed of the surface portion 14 and the inclined surface portion 15, and the apex θ1 where the inclined surface portions 12, 13, 14, 15 are connected is provided in the range of θ1 = 80 ° to 110 °.
In this case, the light incident on the light guide plate 2 travels in the range of the refraction angle γ = 0 to + 42 ° toward the surface portion 10. The inclined surface portion 12 and the inclined surface portion 13 of the light condensing controller 10b are more incident on the light guide plate 2 in the light having a large incident angle (near + 42 °). The light is refracted to the side and the inclined surface portion 13 side, and light at a large emission angle along the light guide plate 2 is emitted slightly.
Similarly, the inclined surface portion 14 and the inclined surface portion 15 are refracted further toward the inclined surface portion 14 side and the inclined surface portion 15 side, and light at a large emission angle along the light guide plate 2 is slightly emitted.

  Thus, in the light condensing control part 10b, the light which went to the surface part 10 direction of the light-guide plate 2 leaks very little, and the light reflection control part 16 of the back surface part 11 (total reflection light by the reflective inclined surface 17a). ) (Reflected light parallel to the incident end face portion 7 and the anti-incident end face portion 8).

As shown in FIGS. 5A to 5C, the light condensing control unit 10b includes the inclined surface portion 12 and the inclined surface portion 13, and the inclined surface portion 14 and the inclined surface portion 15 connected at the apex, and the apex angles of each other. The light totally reflected by the reflection inclined surface 17a of the light reflection control unit 16 when θ1 is in the range of θ1 = 80 ° to 110 °, the reflected light parallel to the incident end surface portion 7 and the anti-incident end surface portion 8 (light condensing control portion (Reflected light from a direction substantially perpendicular to the extending direction of 10a) is refracted by the inclined surface portion 12, the inclined surface portion 13, and the inclined surface portion 14 and the inclined surface portion 15, and is oppositely incident on the side surface portion 9 direction side and the incident end surface portion 7 direction side. It is possible to focus the light toward the end surface portion 8 direction side, and to emit the sharp light of the exit cone having the maximum spread of the exit cone from the surface portion 10 ′ in the substantially vertical direction and within δ = 20 ° from the center.
In addition, the width of the reflective inclined surface 17a and the width of the inclined surface portion 14 and the inclined surface portion 15 are the same.

  Furthermore, if the length of the reflection inclined surface 17a in the light reflection control unit 16 on the back surface part 11 is equal to or slightly longer than the pitch of the light collection control unit 10a or the light collection control unit 10b, the light reflection control unit 16 is used. When the light reflection width of the light and the pitch width of the light collection control units 10a and 10b are viewed from the surface 10 or 10 ′ direction, the light reflection width and the light collection control unit 16 are reflected. The pitch widths of 10a and 10b are equal.

  In the case of the light condensing control unit 10a, the sharp light of the exit cone that refracts a plurality of substantially rectangular lights in a substantially rectangular shape from the incident end face part 7 toward the non-incident end face part 8 is arranged in parallel. In this state, the emitted light can be obtained.

  Similarly, in the case of the light condensing control unit 10b, light in a substantially vertical direction can be refracted in a matrix shape in a substantially quadrangular shape, and sharp light of an exit cone can be emitted.

  Further, as shown in FIGS. 11A and 11B, the light collection control unit 10a or the light collection control unit 10b includes the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24a of the light control sheet 4. 24b is provided so as to be substantially coincident with the center position.

  As a result, most of the light guided into the light guide plate 2 is reliably converted into light that is squeezed by refracting light in a substantially vertical direction from the surface portion 10a or the surface portion 10b of the light guide plate 2 and converted into light. The light from the light conversion body 3 that is emitted to the body 3 and transmitted through the aperture 25 of the light conversion body 3 reliably reaches the center positions of the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b of the light control sheet 4. Further, light having a spread can be emitted from the center position of the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b of the light control sheet 4, and the emitted light without bright spots and blur can be obtained.

  Furthermore, the pitch of the light condensing control unit 10a or the light condensing control unit 10b and the pitch of the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b of the light control sheet 4 are set to be the same.

  Thereby, the sharp light of the exit cone refracted light in the substantially vertical direction by the light collection control unit 10a or the light collection control unit 10b is transmitted through the aperture 25 of the light conversion body 3, and the arcuate portions 23a, It is possible to emit light having a spread from the center position of 23b and the arcuate portions 24a and 24b, and to obtain bright emitted light having no color spots or bleeding.

  Furthermore, the light collection control unit 10a or the light collection control unit 10b is arranged so as to be substantially paired with the aperture 25 of the light conversion body 3.

  And if the emitted light from the light condensing control part 10a or the light condensing control part 10b is made to correspond to the aperture 25, most of the light guided into the light guide plate 2 is surely supplied to the surface of the light guide plate 2. The sharp light of the exit cone narrowed by refracting light in the substantially vertical direction from the portion 10a and the surface portion 10b can be emitted to the aperture 25 of the light conversion body 3. In addition, by reliably guiding the emitted light that has passed through the aperture 25 of the light conversion body 3 and has no bright spots or blurring to the light control sheet 4, the arc-shaped portions 23a and 23b and the arc-shaped portions 24a, Light that spreads from the center position of 24b can be emitted, and emitted light that is bright and free from color spots and blurring can be obtained.

Further, as the apex angle θ1 connecting the inclined surface portion 12 and the inclined surface portion 13 of the light condensing control portion 10a advances from the incident end surface portion 7 to the counter incident end surface portion 8, the apex angle θ1 is changed from θ1 = 110 ° to θ1 = 80 °. Decrease to a small value or increase the height of the apex angle θ1.
Similarly, as the apex angle at which the inclined surface portion 12 and the inclined surface portion 13 and the inclined surface portion 14 and the inclined surface portion 15 of the light condensing control unit 10b are advanced from the incident end surface portion 7 to the non-incident end surface portion 8, the apex angle θ1 is set to θ1. = 110 ° to θ1 = 80 °, or the height of the apex angle θ1 is increased.

  Thereby, especially when the length from the incident end surface portion 7 to the anti-incident end surface portion 8 of the light guide plate 2 is long, the light reflection control of the back surface portion 11 becomes closer as the light from the light source 6 approaches the anti-incident end surface portion 8. The reflected light reflected by the portion 16 has a large reflection angle with respect to the surface portion 10 and the surface portion 10 ′ direction. For this reason, the refraction angle from the light collection control unit 10a or the light collection control unit 10b of the surface unit 10 or the surface unit 10 ′ can be made constant, and can be uniform from the entire surface unit 10 or the surface unit 10 ′. It is possible to emit the sharp light of the exit cone narrowed down by refracting light in a substantially vertical direction.

As shown in FIGS. 11 (a) and 11 (b), the light conversion body 3 transmits the sharp light of the exit cone from the surface portion 10 side which is the exit surface portion of the lower light guide plate 2 with an electronic shutter or the like. The transmission time, shielding time, and luminance are controlled, light from each aperture 25 is converted, and information is emitted to the outside.
Further, the apertures 25 are arranged in a matrix or a staggered pattern.

The light is refracted by the inclined surface portion 12 and the inclined surface portion 13 of the light collection controller 10 a provided on the emission surface portion 10 of the light guide plate 2, and emits light substantially perpendicularly to the aperture 25 of the light conversion body 3.
In addition, since the width | variety of the reflective inclined surface 17a and the width | variety (triangular prism) of the inclined surface part 14 and the inclined surface part 15 correspond in the emitted light at this time, the reflection width of the light reflection control part 16 and light condensing When the pitch width of the control part 10a is viewed from the direction of the surface part 10, it becomes a lattice shape. Thereby, the width of the reflected light of the light reflection control unit 16 is equal to the pitch width of the light collection control unit 10a, and the aperture 25 is converted into a light beam Lsb as a substantially rectangular emitted light from the light collection control unit 10a. Can radiate perpendicularly to the openings.

Similarly, it is bent by the inclined surface portion 12 and the inclined surface portion 13, the inclined surface portion 14 and the inclined surface portion 15 of the light condensing control portion 10 b provided on the light emitting surface portion 10 of the light guide plate 2, and against the aperture 25 of the light conversion body 3. The light is emitted substantially vertically.
At this time, the light condensing control unit 10b has a substantially quadrangular pyramid convex shape (lattice shape), and the light beams refracted by the respective inclined surface portions 12, the inclined surface portions 13, the inclined surface portions 14, and the inclined surface portions 15 are projected in a quadrangular pyramid convex shape. It is equal in shape and radiates perpendicularly to the opening of each aperture 25 as a square light beam Lsb.

  As described above, each aperture 25 becomes a light flux Lsb as a substantially rectangular emission light from the light collection control unit 10a corresponding to the shape of the opening of the aperture 25 from the light collection control unit 10a or the light collection control unit 10b. The light converter 3 converts the electric signal into light signals such as transmitted light and light-shielded light and outputs the light signals to the outside.

As described above, by arranging the aperture 25 of the light converter 3 and the light collection control unit 10a or the light collection control unit 10b to be substantially paired, the light collection control unit 10a or The light emitted from the light collection control unit 10 b matches the aperture 25. As a result, most of the light guided into the light guide plate 2 is surely refracted from the surface portion 10 or the surface portion 10 'of the light guide plate 2 in a substantially vertical direction to radiate the sharp light from the exit cone. Light perpendicular to the aperture 25 of the converter 3 can be emitted and accurate information can be supplied.
Therefore, the light from the light conversion body 3 that has been transmitted through the aperture 25 of the light conversion body 3 can be reliably emitted from the center position of the arc-shaped portion of the light control sheet 4, and the light can be brightly colored and blurred. Can be obtained.

  The light control sheet 4 is formed by forming a lens array shape of a fine convex or concave arcuate portion 23 on the surface of a colorless and transparent polyethylene terephthalate (PET) or polyester resin substrate with an acrylic resin layer, or a colorless and transparent polyethylene. It is formed of terephthalate (PET), polyethylene naphthalate (PEN), polyethersulfone (PES), acrylic resin (PMMA), polycarbonate (PC) or the like.

As shown in FIGS. 6 and 7, the light control sheet 4 has a flat back surface 22 side and a plurality of fine convex or concave arc-shaped portions 23 a and 23 b on the front surface 21 side. The vertical surface 18 corresponding to the direction and the vertical surface 19 corresponding to the direction of the anti-incident end surface portion 8 of the light guide plate 2 are arranged in parallel, and the side surface 20 corresponding to the direction of the side surface portion 9 of the light guide plate 2 is arranged in parallel.
Therefore, the arc-shaped portions 23a and 23b are continuous in the X direction.

In addition, as shown in FIGS. 8A to 8D and FIGS. 9A to 9D, the light control sheet 4 has a flat back surface 22 side and a plurality of fine convex circles on the front surface 21 side. The arcuate part 24a or the concave arcuate part 24b is provided in a matrix.
In this case, as shown in FIGS. 8A to 8D and FIGS. 9A to 9D, the arc-shaped portions 24a and 24b are arranged in a matrix in the XY direction.

Further, as shown in FIGS. 10 (a) and 10 (b), these light control sheets 4 have a specific radius of curvature R, and perpendicular parallel light from the flat back surface 22 side is converted into an arcuate portion 23a. Or refracted at the arcuate part 24a and condensed at a narrow angle β or refracted at the arcuate part 23b or arcuate part 24b and spread to a wide angle β.
Note that the radius of curvature R of the light control sheet 4 is changed depending on the light changing body to be used and the intended application.

  Thus, since the light control sheet 4 has an arbitrary radius of curvature R, the light control sheet 4 has a converging narrow angle β or widening angle β corresponding to the size of the aperture 25 of the light converter 3 and the target viewing angle. A wide variety of images, such as images that can be used for different types of light converters 3 and that are difficult to see externally, such as personal use, and images that are easy to see from all angles at various positions. It can respond to various requests.

  Further, the light control sheet 4 can correspond to the aperture 25 of the light conversion body 3, the light collection control unit 10a or the light collection control unit 10b of the light guide plate 2, and the transmitted light from the light conversion body 3 is bright. It is possible to obtain information and signals such as beautiful images that are free from color spots and blurring, have a wide viewing angle, are easy to see and are easy to see.

  As described above, the pitch of the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b of the light control sheet 4 is equal to the pitch of the light condensing control unit 10a and the light condensing control unit 10b. The sharp light of the exit cone refracted in the substantially vertical direction by the light collection control unit 10a or the light collection control unit 10b is transmitted through the aperture 25 of the light conversion body 3, and the arcuate portions 23a, 23b, An outgoing light beam Ls having a converging narrow angle β or a widening angle β can be emitted from the center position of the arcuate portions 24a, 24b, and bright outgoing light with no color spots or bleeding can be obtained.

As shown in FIG. 12, the prism sheet 31 is formed by forming a shape such as a fine prism or a lens array on the front and back surfaces of a colorless and transparent polyester resin base material with an acrylic resin layer.
Further, the prism sheet 7 may be formed with a shape such as a fine prism or lens array on the front and back surfaces of transparent acrylic resin or polycarbonate, and is colorless and transparent polyethylene terephthalate (PET) or polyethylene naphthalate (PEN). A transparent sheet of polyethersulfone (PES) may be used.

  In addition, the prism sheet 31 with the prism apex angle λ directed toward the surface portion 10 of the light guide plate 2 is provided above the surface portion 10 of the light guide plate 2 of the flat illumination device.

  The prism sheet 31 refracts the emitted light beam BL from the light guide plate 2 or the like at the prism sheet incident surface PI of the prism sheet 31 and is guided into the prism sheet 31, and the light beam BL1 reaching the prism sheet reflecting surface PR is reflected on the prism sheet reflecting surface. Total reflection is performed by PR, and the reflected light BL2 travels in the direction of the prism sheet exit surface PS, and is refracted again to emit the exit light BLO from the prism sheet exit surface PS.

And in the structure provided with the prism sheet 31, especially when the length from the incident end surface part 7 of the light-guide plate 2 to the anti-incident end surface part 8 is long, the light from the light source 6 approaches the anti-incident end surface part 8. The reflected light reflected by the light reflection control unit 16 on the back surface part 11 has a large reflection angle with respect to the front surface part 10 direction. For this reason, it is possible to control the refraction angle from the light condensing control unit 10a and the light condensing control unit 10b on the front surface portion 10 so as to be in the vertical direction, and to the aperture 25 of the light converting body 3 Therefore, the light can be refracted in a substantially vertical direction and the sharp light of the exit cone can be emitted.
Note that the light conversion body 3 may not be used depending on the size of the light conversion body 3 and changes in the light collection control unit 10a, the light collection control unit 10b, and the light reflection control unit 16.

Thus, the flat illumination device unit 1 of the present invention has at least the light source 6, the light guide plate 2, the light converter 3, and the light control sheet 4 as basic configurations, and the light from the light source 6 is transmitted from the surface portions 10 and 10 ′. Light is refracted in a substantially vertical direction and is narrowed down so that the output cone has a maximum spread and δ = 20 ° from the center. The concave light reflection control unit 16 is provided in parallel to the incident end surface portion 7 and the anti-incident end surface portion 8. In addition, the angle θ2 formed by the second inclined surface 17b connecting the reflective inclined surface 17a that reflects in the direction of the surface portion 10 or 10 ′ and the adjacent reflective inclined surface 17a is in the range of θ2 = 120 ° to θ2 = 170 °. Provided. Further, the light condensing controller 10a or 10b having a fine convex shape for refraction extends or continues in the direction of the anti-incident end face 8 in a direction perpendicular to the incident end face 7 on the surface 10 or 10 ′. In parallel. Moreover, the light condensing control units 10a and 10b have inclined surface portions 12, 13, and 14, 15 in opposite directions, and the apex angle θ1 at which the inclined surface portions 12, 13, 14, and 15 are connected is θ1 = 80 ° − It is provided in the range of θ1 = 110 ° so that the exit cone from the light collection control units 10a and 10b has a maximum spread within 20 ° from the center. Further, the light collection control units 10a and 10b refract the reflected light from the light reflection control unit 16 in a substantially vertical direction from the surface units 10 and 10 ′ without emitting the direct light from the incident end surface portion 7. Sharp light from the exit cone can be emitted.
Further, as the light collection control units 10a and 10b are advanced from the incident end surface portion 7 to the non-incident end surface portion 8, the apex angle at which the inclined surface portions 12, 13 and 14, 15 are connected is changed from θ1 = 110 ° to θ1 = 80 °. Or the height of the apex angle θ1 is increased, and particularly when the length from the incident end surface portion 7 to the anti-incident end surface portion 8 of the light guide plate 2 is long, the light from the light source 6 enters the anti-incident end surface portion 8. As it gets closer, the reflection angle of the reflected light reflected by the light reflection control unit 16 of the back surface portion 11 increases with respect to the front surface portion 10 or 10 ′ direction. For this reason, the refraction angle from the light condensing control parts 10a and 10b of the surface parts 10 and 10 'can be made constant.
As a result, it is possible to emit the sharp light of the exit cone that is narrowed down by refracting light uniformly and substantially vertically from the entire surface portion 10 or 10 '.
Furthermore, since the length of the reflection inclined surface 17a of the light reflection control unit 16 is equal to or slightly longer than the pitch of the light collection control units 10a and 10b, the reflection width of the light reflection control unit 16 and the light collection control unit 10a are set. When the pitch width is 10 or 10b when viewed from the surface 10 or 10 'direction, it becomes a lattice shape. As a result, the reflected light width of the light reflection control unit 16 is equal to the pitch width of the light collection control units 10a and 10b, and substantially rectangular or square emission light is obtained from the light collection control units 10a and 10b. Can do.
The light conversion body 3 that is electronically controlled is provided above the light guide plate 2 that refracts light in such a substantially vertical direction and emits light having a sharp exit cone, and performs light collection control on the light conversion body 3. The parts 10 a and 10 b and the aperture 25 of the light conversion body 3 are arranged so as to be substantially paired, and the light emitted from the light collection control units 10 a and 10 b is matched with the aperture 25. As a result, the sharp light of the exit cone that has been narrowed down by refracting most of the light guided into the light guide plate 2 from the surface portions 10 and 10 'of the light guide plate 2 in a substantially vertical direction is converted into a light converter. 3, and the light perpendicular to the aperture 25 of the light converter 3 is supplied. As a result, a wide variety of information can be accurately supplied and emitted, and the transmitted light from the light conversion body 3 is clear and bright, and the emitted light can be obtained without color spots or blurring.
Furthermore, the back side 22 is flat above the light converter 3 and the parallel light perpendicular to the back side 22 is refracted by the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b to be condensed or spread. A light control sheet 4 having a radius of curvature R and provided with the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b in parallel or in parallel is provided.
Therefore, the light from the aperture 25 of the light conversion body 3 can be obtained as condensed or spread outgoing light, and the outgoing light corresponding to the size of the aperture 25 of the light conversion body 3 and the target viewing angle is obtained. The transmitted light from the light conversion body 3 is bright and free from color spots and blurring, can be obtained clearly and is easy to see, and is beautiful to the eyes. It is possible to meet a wide variety of demands such as images that are easy to see from the outside at any angle.
Further, the pitch of the arc-shaped portions 23a and 23b and the arc-shaped portions 24a and 24b of the light control sheet 4 is made equal to the pitch of the light condensing control portions 10a and 10b. As a result, the sharp light of the exit cone refracted in the substantially vertical direction by the light collection control units 10a and 10b is transmitted through the aperture 25 of the light conversion body 3, and the arc-shaped portions 23a and 23b and the arc-shaped portions are surely transmitted. Light that is condensed or spread can be emitted from the central positions of 24a and 24b, and clear and bright outgoing light that is free from color spots and blurring can be obtained.
However, the flat illumination device unit 1 of the present invention accurately supplies the sharp light of the exit cone from the light guide plate 2 to the aperture 25, and the light transmitted through the aperture 25 is condensed or spread by the light control sheet 4. It is possible to accurately produce beautiful images and information that are bright and free from color spots and blurring, are easy to see and are easy on the eyes.

DESCRIPTION OF SYMBOLS 1 Planar illuminating device unit 2 Light guide plate 3 Light conversion body 4 Light control sheet 5 Case 5a Case bottom part 5b, 5c Case inner part 6 Light source 7 Incident end face part 8 Anti-incident end face part 9 Side part 10 Surface part 10 'Surface part 10a Light Condensing controller (triangular prism)
10b Light condensing control unit (triangular pyramid)
DESCRIPTION OF SYMBOLS 11 Back surface part 12 Inclined surface part 13 Inclined surface part 14 Inclined surface part 15 Inclined surface part 16 Light reflection control part 17a Reflective inclined surface 17b 2nd inclined surface 18 Vertical surface (light-guide plate incident-end-surface part direction)
19 Longitudinal plane (direction of light incident side opposite to the light guide plate)
20 side (light guide plate side surface direction)
21 Front side 22 Back side 23a Convex arcuate part (X)
23b Concave arc-shaped part (X)
24a Convex arcuate part (XY)
24b concave arcuate part (XY)
25 Aperture 31 Prism sheet 32 Output cone δ Cone angle (polar angle)
n refractive index γ refraction angle α critical angle R radius of curvature β wide angle θ1 apex angle (surface)
θ2 Vertical angle (back side)
λ Prism apex angle PI Prism sheet entrance surface PR Prism sheet reflection surface PS Prism sheet exit surface Ls Outgoing ray LSb Luminous flux BLBL1, BL2, BLO ray

Claims (12)

A light source, an incident end face that guides light from the light source, a side face connected to the incident end face and the non-incident end face facing the incident end face, and orthogonal to the incident end face and the side face A light guide plate having a front surface portion and a back surface portion; a light converter having a plurality of fine apertures that receive light from the front surface portion; and a light control sheet that refracts light above the light converter. In the flat illumination device unit that emits light from the surface portion to the aperture, and emits refracted light from the light control sheet,
The front surface portion is provided with a light converging control portion having a fine convex shape for performing refraction, and the back surface portion is provided with a light reflection control portion having a fine concave shape for performing reflection. Direct light from the light is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, and the light collection control unit refracts light in a substantially vertical direction and emits the light. A plane that emits light having a sharp cone and is arranged so that the light collection control unit and the aperture are substantially paired, and light emitted from the light collection control unit coincides with the aperture. Lighting device unit. A light source, an incident end face that guides light from the light source, a side face connected to the incident end face and the non-incident end face facing the incident end face, and orthogonal to the incident end face and the side face A light guide plate having a front surface portion and a back surface portion; a light converter having a plurality of fine apertures that receive light from the front surface portion; and a light control sheet that refracts light above the light converter. In the flat illumination device unit that emits light from the surface portion to the aperture, and emits refracted light from the light control sheet,
The front surface portion is provided with a light converging control portion having a fine convex shape for performing refraction, and the back surface portion is provided with a light reflection control portion having a fine concave shape for performing reflection. Direct light from the light is not emitted, only the light from the light reflection control unit is reflected in the direction of the light collection control unit on the surface, and the light collection control unit refracts light in a substantially vertical direction and emits the light. Emits a sharp cone of light,
The light control sheet is flat on the back side where light is incident on the opposite side of the light converter that receives light, and the front side forms an arcuate part, and the center of the light condensing control part and the arcuate part A flat illuminating device unit provided so as to substantially coincide with a position, and refracting light incident on a central position of the arc-shaped portion from the arc-shaped portion into condensed or spreading light. The flat illumination device unit according to claim 1 or 2, wherein a pitch of the arc-shaped portion of the light control sheet is equal to a pitch of the light condensing control portion. 3. The flat illumination device according to claim 1, wherein the light control sheet has a radius of curvature that condenses or spreads the parallel parallel light from the flat back surface side by refracting the arc-shaped portion. unit. The flat lighting device unit according to claim 1, wherein the light control sheet is provided with the arc-shaped portions arranged in parallel in parallel or in a matrix shape. 3. The plane according to claim 1, wherein the light condensing control unit has inclined surface portions in opposite directions and an apex angle at which the inclined surface portions are connected is in a range of 80 ° to 110 °. Lighting device unit. 3. The flat illumination device unit according to claim 1, wherein the light condensing control unit has a maximum extent of an outgoing cone within 20 [deg.] From the center. 3. The flat illumination device unit according to claim 1, wherein the light condensing control unit is provided in parallel so as to extend in a direction perpendicular to the incident end surface portion or in a direction opposite to the incident end surface portion. . The light reflection control unit is provided in parallel with the incident end surface portion and the anti-incident end surface portion, and a second inclined surface that connects the same reflective inclined surface as the reflective inclined surface that reflects in the surface portion direction; The flat illumination device unit according to claim 1 or 2, wherein an angle formed is in a range of 120 ° to 170 °. As the light condensing control unit proceeds from the incident end surface portion to the counter incident end surface portion, the apex angle to which the inclined surface portion is connected is reduced from 110 ° to 80 ° or the height of the apex angle is increased. The flat illumination device unit according to claim 1 or 2. 3. The flat illumination device unit according to claim 1, wherein the light reflection control unit makes the length of the reflection inclined surface equal to or slightly longer than the pitch of the light condensing control unit. The flat illumination device unit according to claim 1, further comprising: a prism sheet having an apex angle directed toward the light guide plate at an upper portion of the surface portion of the light guide plate.

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