JP2015099695A - Pseudo-parallel beam projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of projecting soft light of which the projection range is narrowed into the light projection direction and capable of thinning the thickness in the light projection range of the beam projector.SOLUTION: A pseudo-parallel beam projector includes a diffusion light planar light source which emits diffusion light and orientation angle control means. Therein, the orientation angle control means is provided on the whole surface of an emission surface of the diffusion light planar light source, on a diffusion light emission projection region of the area of 50% or more of the light emission surface, orientation angle 0° component light of the diffusion light is projected as it is, and the pseudo-parallel beam projector projects pseudo parallel light which does not contain such high orientation angle light that an angle formed with respect to the normal of the light emission surface is 60° or more to an object to be projected which is located in the projection direction as the normal direction of the light emission surface and does not project the pseudo parallel light to an observer.

Description

  The present invention relates to a quasi-parallel light projector that includes a diffused light planar light source that emits diffused light, and that allows the observer to visually recognize the projected object by brightly illuminating the projected object.

  In particular, as the diffused light planar light source, an organic EL light source that emits soft diffused light from the entire surface is suitable, and among them, a large area organic EL light source having a light emitting surface of 5 cm square or more is suitable.

  In the quasi-parallel light projector of the present invention, the object to be projected can be exemplified by arts and exhibits, for example, for the purpose of making the product in the show window attractive to the viewer. The appearance of the object can be used as a lighting apparatus suitable for causing an observer to have a beautiful appearance.

  In recent years, an organic EL light source has attracted attention as an illumination light source to replace incandescent lamps and fluorescent lamps, and many studies have been made. In addition, an organic EL method is attracting attention as a method for changing to a liquid crystal method or a plasma method in a display member typified by a television.

  Here, the organic EL light source is obtained by laminating an organic EL element on a base material such as a glass substrate or a transparent resin film. In addition, the organic EL element has two or more light-transmitting electrodes facing each other, and a light emitting layer made of an organic compound is laminated between the electrodes. The organic EL element emits light by the energy of recombination of electrically excited electrons and holes. Since the organic EL light source is a self-luminous device, a high-contrast image can be obtained when used as a display material. In addition, light of various wavelengths can be emitted by appropriately selecting the material of the light emitting layer. In addition, the thickness is extremely thin compared to incandescent lamps and fluorescent lamps, and light is emitted on the surface, so there are few restrictions on the installation location.

  A typical layer structure of the organic EL light source is as shown in FIG. The organic EL light source 100 shown in FIG. 5 has a configuration called a bottom emission type. A transparent electrode layer 120, a functional layer 130, and a back electrode layer 140 are laminated on a glass substrate 110, and these are sealed. It is sealed by the part 150. The functional layer 130 is formed by laminating a plurality of thin films of organic compounds. The representative functional layer 130 includes a hole injection layer 131, a hole transport layer 132, a light emitting layer 133, and an electron transport layer 134. Light is emitted from the glass substrate 110 by application of voltage.

  An output coupling film is attached to the surface of the organic EL light source to increase the emission intensity and realize a Lambertian light distribution, which has been used for illumination. In addition, a driving power supply circuit and a driver circuit are incorporated in the organic EL light source, and a fixing means attached to a ceiling or the like, a casing, and the like are combined to complete organic EL illumination.

  As described above, the organic EL light source is thin and can emit light arbitrarily by a combination of organic materials. Therefore, the organic EL light source has a feature that it can emit light naturally. It attracts attention.

  However, since the organic EL light source has a lower emission luminance than inorganic LEDs, a certain amount of area is required when used as illumination for art works or the like. In some cases, an observer may see the organic EL light source itself in appreciating art. At that time, since the organic EL light source is brighter than the illuminated artwork, the illumination light source becomes an obstacle.

  As a conventional lamp that copes with such a problem, for example, a spotlight that has been made parallel light by providing a reflecting mirror or a lens around a point light source is known.

  However, since it is light emitted from a small area, it is not possible to project soft light emitted from a surface light source, and there is a problem of heat generation, a problem that ultraviolet light is included in the light source, Or there exists a problem that it becomes a light source with a thick light projection direction thickness by the restriction | limiting of the thermal design of a light source, or the structural design of a condensing part.

  For this reason, the illumination light source is conspicuous with respect to the light projection target even if it is a flat light source such as an organic EL light source, which is a projector for allowing the viewer to visually recognize the light projection target brightly. There has been a need for a projector that does not exist, that is, when the observer compares the two, the projected object looks brighter.

  If it is a floodlight having such a feature, and if it can be a diffused light planar light source such as an organic EL light source, the above-described features of both thinness and soft light are utilized. It can be expected to be the most suitable projector for the purpose.

  On the other hand, as an example of a planar light source in which the orientation angle is controlled, Patent Document 1 discloses the use of a substrate in which glass fibers are bundled. Further, as in Patent Document 2, a cylindrical lens is projected onto a light emitting surface. An example in which the prism sheet is pasted as in the case of standing or as in Patent Document 3, and an example in which small devices are discretely provided and lenses are arranged corresponding to the devices are disclosed as in Patent Document 4. However, it does not actively aim to realize the floodlight as described above.

  Further, in Patent Document 5, in a light emitting device in which light emitted from a light emitting element is emitted from the transparent substrate to the front surface, in order to improve the light extraction efficiency and the front luminance of the light emitting device, the light emitting side of the transparent substrate is arranged. Although a technology has been disclosed in which the surface is a concavo-convex portion including a vertical surface parallel to the principal surface normal direction and a parallel horizontal surface, this also realizes the projector described above. It is not a positive aim.

  Furthermore, in Patent Document 6, a display panel in which an opaque display pattern is drawn on a transparent plate and a lattice-type light-shielding mask are provided in order on the surface of the electroluminescence plate, and disturbance light is generated on the surface of the display plate. Although the technique which raises the visibility of a display pattern by making it not reach | attainment is disclosed, this is a technique regarding a display.

  As described above, an example in which a projector having both thin and soft light characteristics is actively realized is not yet known.

JP-A-10-199672 JP 2010-278021 A JP 2007-234578 A JP 2002-049326 A JP 2008-010245 A Japanese Utility Model Publication No. 05-065098

  The present invention has been made based on a new concept with reference to such prior art, and it is soft while narrowing the projection range in the projection direction and providing an effect like a so-called spotlight. It is an object of the present invention to provide a new projector capable of projecting light and capable of reducing the thickness of the projector in the projection direction.

  For example, to realize a projector in which the light projecting direction is limited while taking advantage of the thin organic EL light source. Further, when such a projector is viewed from the side, it is possible to illuminate the illuminated exhibition without recognizing light emission.

  These prior arts have a large problem in that they are expensive compared to the function to be realized, require a large space, and in particular, increase the thickness in the light projecting direction. From the object of the present invention of developing a thin and inexpensive projector while projecting light, it is a distant technology, and in particular, it impairs the characteristics of a thin flat light source, particularly an organic EL light source.

  In Patent Document 1, it is assumed that a glass fiber sheet bundled on a substrate is used. However, since the substrate of the organic EL light source requires a material with extremely high smoothness, it is considered that a high level of polishing technology is necessary. This is a problem because the price is very high. In the technique of Patent Document 2, the cylindrical lenses are arranged so as to stand on the substrate. However, such a lens is expensive, and in addition, it is difficult to fix the lens to the surface of the substrate at equal intervals. Think. Further, in Patent Document 3, a three-dimensional structure is provided in the sheet to be attached, and this configuration is also difficult to implement and expensive. In the configuration of Patent Document 4, since a small LED chip is arranged and a lens array is arranged correspondingly, it is difficult to configure a light source with a desired thickness.

  Further, Patent Document 5 has a drawback in that the light source can be seen from other than the front of the light source because the surface of the transparent substrate is provided with irregularities in the first place.

  Furthermore, Patent Document 6 aims to improve the visibility of the display panel of the display, and is a technique for a display that is directly viewed by the observer, on the premise that the observer does not look directly, From the viewpoint of protecting the eyes of the observer, the target product is completely different from the pseudo-parallel light projector according to the present invention, which should be devised so that the observer does not look directly at the projection light source.

  The present invention is a quasi-parallel light projector provided with a diffused light planar light source, and the projected light includes a component of high-orientation angle light having an angle of 60 degrees or more with the normal line of the light emitting surface of the planar light source. There is no pseudo-parallel light projector. Of course, from the viewpoint of projecting soft light, it is preferable to realize a Lambertian light distribution in general for low orientation angle light of preferably less than 60 degrees.

  Such a quasi-parallel light projector according to the present invention is a quasi-parallel light projector that makes a light-projected object bright and visible to an observer by the light projection, a diffused light planar light source that emits diffused light, and orientation angle control means And the orientation angle control means is provided on the entire light emitting surface of the diffused light planar light source, and in the diffused light emitting / projecting region having an area of 50% or more of the light emitting surface, The component light having the orientation angle of 0 degrees is projected as it is, and the pseudo-parallel light projector emits the pseudo-parallel light that does not include the high-orientation angle light having an angle of 60 degrees or more with the normal line of the light emitting surface. A quasi-parallel light projector that projects light on the projection target located in a light projecting direction that is a normal direction of the light emitting surface and does not project the observer.

  Such a quasi-parallel light projector according to the present invention can easily give an effect like a spotlight by providing a specific orientation angle control means, that is, the light source is illuminated from other than the front of the light source. It is difficult to see, and in comparison with a spotlight that is illuminated two-dimensionally, it is difficult to produce a shadow in three dimensions, and it is illuminated so that it looks natural.

  The orientation angle control means is a grid-like plate having openings corresponding to the diffused light emitting and projecting regions whose thickness in the light projecting direction is D and whose average aperture width in the in-plane direction of the light emitting surface is E, and It is preferable to satisfy D ≧ E / √3, while projecting quasi-parallel light that does not include high-orientation angle light having an angle of 60 ° or more with the normal line of the light-emitting surface, It is possible not to project light to the observer.

  The lattice plate includes a plurality of the openings, and includes walls that individually divide adjacent openings of the height of D and the average wall thickness T in the in-plane direction of the light emitting surface. In addition, it is preferable that T satisfies T ≦ 0.5E, and light emitted from the planar light source can be projected more effectively.

  It is preferable that the lattice formed by the openings of the lattice plate is one selected from the group consisting of a hexagonal lattice, a square lattice, and a corrugated cardboard cross-sectional shape lattice with sandwiched wavy lines between parallel lines. .

  The lattice plate can be appropriately selected by selecting the shape of the lattice to have a design effect, but can be easily created, particularly if it is either a hexagonal lattice or a square lattice. Excellent design.

  It is preferable that the wall has a light-absorbing surface. The effect of obtaining pseudo-parallel light, the effect of suppressing the visibility of the projector to the observer, and the effect of suppressing the light projection to the observer of the present invention. Can be increased.

  Since the material of the lattice-like plate is a metal, heat dissipation is improved, which is preferable.

  As the diffuse light planar light source, an organic EL light source capable of obtaining thin and soft diffuse light is preferable.

  The orientation angle control means is preferably attached to the entire surface of the light emitting surface, and can be easily attached.

  In such a quasi-parallel light projector according to the present invention, the orientation angle control means can be changed according to the application, so that one kind of diffused light planar light source can control the orientation angle according to various types of the present invention. By preparing the means, it is possible to obtain a lighting effect according to the installation location of the projector according to the present invention, the light projection target, and the observer, which is preferable.

  In addition, as a systemized series, it is efficient to manufacture and sell such a diffuse light planar light source and a plurality of orientation angle control means, that is, a quasi-parallel light projector series composed of a lattice plate, This is preferable because it accurately answers the needs of the owner who performs the lighting.

  The lamp of the present invention simply provides a lattice plate on the surface of the diffuse light planar light source, narrows the light projection range in the light projection direction, and provides soft light while providing an effect similar to a so-called spotlight. Since the light can be projected and the thickness of the light projector in the light projecting direction can be reduced, lighting in various fields and new fields can be realized.

Conceptual diagram of pseudo-parallel light projector of the present invention Conceptual diagram of organic EL light source Conceptual diagram of lattice shape of lattice plate Cross-sectional conceptual diagram of the quasi-parallel light projector of the present invention A photograph in which the lighting lamps of the example and the comparative example are comparatively observed in the light projecting direction. The photograph which compared and observed the lighting lamp of an Example and a comparative example from the direction from which the angle made with a light emission surface becomes a low angle. The photograph which compared and observed the to-be-projected object projected from the lamp of an Example and a comparative example.

  Hereinafter, embodiments of the present invention will be described. In addition, this invention is not limited to the following embodiment, A various change is possible within the technical common sense of those skilled in the art.

(Pseudo-parallel light projector)
In general, the projector projects parallel light onto a projection target. By illuminating brightly with the projection light, the visibility of the projection target observer is improved.

  The present invention relates to a quasi-parallel light projector that is a projector based on a concept different from such a conventional parallel-light projector lamp, and can project light including a diffused light component onto an object to be projected. An effect is obtained. In other words, the light containing the diffused light component can illuminate the projection target softly and naturally, so that its beauty may be further enhanced.

(Pseudo parallel light)
Parallel light is, in principle, light having an orientation angle of only 0 degrees, but is actually highly directional light including light having a certain degree of orientation angle.

  On the other hand, the quasi-parallel light according to the present invention is light that does not include light with a high orientation angle. Specifically, the angle formed with the normal line of the light emitting surface according to the present invention is a high angle of 60 degrees or more. It is light with low directivity that does not include orientation angle light. Preferably, it does not contain light having an orientation angle of 45 degrees or more, and preferably contains light having an orientation angle of 30 degrees or more.

(Light emission direction)
The light projecting direction according to the present invention is a direction in which the light projector projects the maximum light flux, and in the light projector according to the present invention, it is the normal direction of the light emitting surface according to the present invention. Therefore, it is assumed that the projector according to the present invention is used for the purpose of projecting light to an object to be projected located in the projecting direction.

  One of the features of the projector of the present invention is that it is possible to perform light projection controlled so as not to project light to an observer even though light containing a diffusing component is projected.

(Diffuse light planar light source)
Diffused light is light that is not oriented in a specific direction, such as light emitted in all directions from a point light source.

  The diffused light planar light source according to the present invention is a planar light source that emits diffused light. From each point in the surface of the light emitting surface according to the present invention, light having an orientation angle in the range of −90 degrees to 90 degrees is emitted, and the orientation is low. However, as will be described later, even a planar light source that improves the luminous flux of low-orientation angle light by attaching an output coupling film can be classified as a diffused light planar light source because it includes high-orientation angle light.

  As such a diffused light planar light source according to the present invention, a point light source, for example, a planar light source in which miniature bulbs are arranged in a plane, a combination of an LED light source and a diffuser plate to obtain a planar light source, an organic EL light source to be described later For example, organic EL can be provided because it is possible to provide soft, high-quality diffused light as light of various colors, or as light of high color rendering properties, with a small thickness in the light projecting direction and at a relatively low cost. A light source is preferred.

(Light emitting surface)
The surface of the material from which diffused light is actually emitted from the diffused light planar light source according to the present invention into the atmosphere is the light emitting surface according to the present invention.

  One of the features of the projector of the present invention is that the orientation angle control means according to the present invention is provided on the entire surface of the light emitting surface, and the book of the emitted light substantially over the entire circumference of the light emitting surface. The light projection from the projector of the invention is preferably blocked by this means, and the light projection to the observer can be more effectively prevented.

  As described above, the region where the specific material of the orientation angle control means according to the present invention is opposed to the non-diffused light emission / projection region in the light emitting surface, and the other components whose diffused light has an orientation angle of 0 degree. A region where the light is projected as it is is referred to as a diffused light emission projection region.

  One of the features of the projector according to the present invention is that the diffused light emitting and projecting area according to the present invention is 50% or more of the area of the light emitting surface according to the present invention, more preferably 70% or more. Further, it is more preferably 80% or more, particularly preferably 90% or more, and the emitted diffused light can be projected more effectively.

  Moreover, it is preferable that the device for causing the diffused light emitted in the non-diffused light emitting / projecting region to contribute to the light projecting according to the present invention is the light projector formed by the orientation angle control means according to the present invention.

(Organic EL light source)
In the organic EL light source 100 according to the present invention, for example, as shown in FIG. 2, a transparent electrode 120 is formed on a transparent substrate 110, and a hole transport layer 131, a light emitting layer 132, an electron transport layer 133, and the like are formed thereon. The electron injection layer 134 and the cathode 140 are formed, and the sealing layer 150 is provided to complete the structure.

  It is preferable to use a material whose luminance is increased by attaching an output coupling film to the opposite side (light emitting surface side) of the surface of the transparent substrate 110 on which the element is formed. As a result, it is known that light emitted in various directions due to interference inside the organic EL organic layer is aligned to some extent and the amount of emitted light increases. Is basically diffused light, and is not light that does not include highly oriented angle light having an angle of 60 ° or more with respect to the normal line of the light emitting surface, such as projected light according to the present invention.

  In the present invention, a grid plate 3 is provided on the light emitting surface of such an organic EL light source as shown in FIG. Easy to paste. Accordingly, an output coupling film may or may not exist between the grid plate 3 and the glass plate 110, but it is preferable to exist from the viewpoint of increasing the amount of light emitted.

(Orientation angle control means)
The present invention is characterized in that means for adjusting the light distribution angle of the projected light, which is the orientation angle control means, is provided on the entire light emitting surface.

  As described above, the orientation angle control means according to the present invention has the orientation angle of the diffused light emitted from the diffused light emitting and projecting region which is the region of the light emitting surface according to the present invention that is not opposed to the specific material. It is means for projecting light having a component of 0 degree as it is, and preventing light from being projected at least as it is from the non-diffused light emitting and projecting area facing the specific material.

  By providing such an orientation angle control means, the projector of the present invention has a projection angle range related to visibility from the observer and an orientation angle related to the softness of the light of the projected light. Range is controlled. Therefore, even if the same diffused light planar light source is used, the projector of the present invention produces various illumination effects by applying various kinds of orientation angle control means and making them replaceable according to the application. Can be easily done.

(Lattice plate)
The orientation angle control means is preferably a grid-like plate having a thickness D in the light projecting direction and an average opening width E, and preferably D ≧ E / √3. More preferably, D ≧ E, and D ≦ √3 × E.

  For example, when the average opening width E of the lattice is 1 mm, the thickness D of the lattice plate is preferably 0.58 mm or more. In this case, even if the high-orientation angle light having an angle of 60 degrees or more with the normal line of the light emitting surface is blocked by the orientation angle control means and emitted from the light emitting surface, the light projector of the present invention emits light. In addition, the light is not projected and is not visually recognized by an observer at a high angle position where the angle formed with the normal line of the light emitting surface is 60 degrees or more.

  For example, when the average opening width E of the lattice is 10 mm, the thickness D of the lattice plate is more preferably 10 mm or more. In this case, even if the high-orientation angle light having an angle of 45 degrees or more with the normal line of the light emitting surface is blocked by the orientation angle control means and emitted from the light emitting surface, the light projector of the present invention emits light. In addition, it is not projected and is not visually recognized by an observer who is at a high angle position of 45 degrees or more with respect to the normal line of the light emitting surface.

  For example, when the average opening width E of the lattice is 0.1 mm, the thickness D of the lattice plate is more preferably 0.173 mm or less. In this case, soft pseudo-parallel light including light having an orientation angle of 30 degrees or less with respect to the normal line of the light emitting surface can be projected from the projector of the present invention.

  From the viewpoint of taking advantage of the thin flat light source, D is preferably 10 mm or less, more preferably 5 mm or less, further preferably 2 mm or less, and particularly preferably 1 mm or less. If D is 0.5 mm or less, the light emission state of the optical device itself has a special effect, which is preferable.

  The thickness of the grating is appropriately determined, but in general, by making the thickness from 1 mm to 3 mm, for example, it is possible to utilize the feature that the thickness of the organic EL light source is thin.

  As described above, as shown in FIG. 4, the thickness and average opening width are important for the structure of the grid-like plate according to the present invention. A light angle range is obtained. On the other hand, when the thickness D increases, the light projection angle range is narrowed, and light projection is performed in a more narrow angle range. Further, when the average opening width E becomes smaller, this angular range becomes wider. In order to project light within a narrow angle range to some extent, it is desirable that the average opening width and the thickness are equal or larger, but these may be determined appropriately depending on the application.

  The lattice shapes constituting the openings of the lattice plate according to the present invention can be used in various shapes or in combination with different shapes, but from the viewpoint of designability and ease of manufacture. A hexagonal lattice, a square lattice, and a corrugated cardboard cross-sectional lattice are preferable, and a single shape is more preferable.

  FIG. 3 illustrates such a square lattice and a hexagonal lattice. It can be used as appropriate depending on the ease of production and design.

  The lattice plate can be easily provided by applying an optical adhesive on one surface of the lattice and attaching it to the light emitting surface according to the present invention.

  There are several methods for forming such a lattice-like plate, and one or two methods may be used from these methods. For example, as a time-consuming method, a tape-like member having a grid-like plate height is provided with slits formed at equal intervals, and these are combined to form a lattice by providing an adhesive at the junction. be able to. Also, if you want to make it easily, you can think of a structure in which cuts are formed in a grid shape in the mold and metal or plastic is poured into that part. Further, by attaching an adhesive to the members on the tape at equal intervals and pulling alternately the portions that are attached and the portions that are not attached, a structure having a honeycomb-like lattice shape is obtained. What is necessary is just to attach to the light emission surface which concerns on.

  If the corrugated cardboard is cut into round sections, the cross section becomes an element of one type of lattice (triangular lattice), and a corrugated cardboard cross-sectional lattice, which is a triangular lattice, can be formed by stacking them together.

  In addition, the material of the lattice-like plate can be implemented from an inexpensive one to an expensive one. However, in order to improve productivity, it is preferable to mold the resin to form the lattice-like plate. When the lattice plate is made of metal, the lattice may have an effect of releasing heat.

  For example, the lattice plate can be configured by cutting a thin paper on a tape and cutting it at equal intervals on one side, and assembling the paper together. When the grating is attached to the light irradiation surface, the grating can have an effect similar to that of a heat radiating fin.

(Opening)
As described above, the lattice plate according to the present invention has a through-opening corresponding to the diffused light emitting and projecting region according to the present invention. Even if there is only one opening, a certain degree of effect can be obtained, but a plurality of openings is more effective.

  Such an opening according to the present invention is a wall that individually divides adjacent openings, and has a height D that is the thickness in the light projecting direction and an average wall thickness T in the in-plane direction of the light emitting surface, where T ≦ 0. It is preferable that it is formed by a wall that is .5E, and light emitted from a planar light source can be projected more effectively. More preferably, T ≦ 0.25E, even more preferably T ≦ 0.1E, and particularly preferably T ≦ 0.05E. Although it is important for the grating walls to be thin to increase the amount of light to be projected, in some cases, the thickness can be adjusted for the visual effect to adjust the amount of light. In general, the amount of light increases or decreases depending on the ratio of the area of the wall and the area where the lattice plate is attached, and the amount of light emitted is adjusted.

  Further, if the inner wall or the whole of the grid-like plate is a light-absorbing surface, for example, a surface colored with matte black, the light emission itself can be made inconspicuous, and the effect of the present invention is more effective. Since it is played, it is preferable.

  If the wall surface is white, it is possible to make the grid inconspicuous in the case of a white light emitting device. If a metal surface or mirror surface is used, the amount of light can be increased, but the condensing effect is diminished. Although it is important for thinning the lattice walls to increase the amount of light, in some cases, the thickness can be adjusted for visual effects to adjust the amount of light. In general, the amount of light increases or decreases depending on the ratio of the area of the wall and the area where the lattice plate is attached, and the amount of light is adjusted.

  Examples will be described below.

  FIG. 5 is a photograph of comparative observations of the lighting lamps of the example and the comparative example toward the light projecting direction.

  FIG. 6 is a photograph of comparative observations of the lighting lamps of the example and the comparative example from the direction in which the angle formed with the light emitting surface is a low angle.

  FIG. 7 is a photograph of comparative observation of the light projection target projected from the lamps of the example and the comparative example.

  In Examples 1 and 2, the corrugated cardboard paper was cut into strips to form a lattice plate. The laminated material is partly colored with matte black (most part of Example 1) and placed in front of the organic EL light source.

  The grid-like plate in this example is an experimental device for verifying whether the present invention functions to the last, and the function is limited because it is a handmade work. It can be made by molding with black plastic. Although the thickness of the wall is 3 mm, the thickness can be appropriately reduced. Although the lattice plate is simply pasted to the light emitting surface of the organic EL light source with gum tape, it is possible to further improve the design by pasting the lattice plate with a heat-resistant adhesive or optical adhesive. It is.

  As seen from the front as shown in FIG. 5, it can be seen that light is emitted from between the lattice plates. Compared with Comparative Example 1, it can be seen that both Examples 1 and 2 are darker because of the thickness of the wall of the grid-like plate, but in the portion not coated with black, the horizontal direction from the organic EL light source It is a little brighter when viewed from the front because the light is reflected by the walls inside the lattice.

  This is a significant difference in observation when these projectors are viewed from the side (FIG. 6). That is, in Example 1 where the wall surface was coated with a non-reflective black paint, the light source was difficult to see, whereas in Example 2 where it was partially applied, the light source was like a lattice due to irregular reflection inside the grating. It seems that only the thickness of the board protrudes to the front. If the grid plate is perfect, the light source will only appear black.

  The exhibits were placed at a distance of 40 cm from these projectors. As shown in FIG. 7, there was no difference in the lighting effect on the exhibit. The cause of this is thought to be that the size of the exhibit is smaller than the size of the light source, but the fact that the size of the light source can be adjusted according to the size of the exhibit is considered to be an advantage of the organic EL light source, for example. In addition, it is considered that the dimming of the peripheral part by the grid-like plate is not a problem in practical use in the application of lighting of the exhibit.

  On the other hand, in this example and comparative example, a grid-like plate is arranged in front of a device that connects three square organic EL panels. In the organic EL panel, each panel is taken out for taking out electrodes and the like. It cannot emit light at the periphery. For this reason, there is a problem that the joint is anxious. However, by arranging the grid-like plate, an effect of hiding the joint when the light source is viewed from the side can be expected.

110 Glass substrate 2 Optical coupling film (OCF)
3 Lattice plate 100 Organic EL light source

Claims (9)

A quasi-parallel light projector that makes the projected object bright and visible to an observer by the projection,
A diffused light planar light source that emits diffused light, and an orientation angle control means,
The orientation angle control means is provided on the entire light emitting surface of the diffused light planar light source, and in the diffused light emitting and projecting area having an area of 50% or more of the light emitting surface, the orientation of the diffused light The angle 0 degree component light is projected as it is,
The quasi-parallel light projector is configured to locate quasi-parallel light that does not include high-orientation angle light having an angle of 60 degrees or more with the normal line of the light emitting surface in a light projecting direction that is a normal direction of the light emitting surface. A quasi-parallel light projector that projects light on an object to be projected and does not project the observer.   The orientation angle control means is a grid-like plate provided with openings corresponding to the diffused light emitting and projecting areas having a thickness in the light projecting direction of D and an average aperture width in the in-plane direction of the light emitting surface of E; The pseudo-parallel light projector according to claim 1, wherein D ≧ E / √3.   The grid plate has a plurality of the openings, and includes walls that individually divide adjacent openings of the height of D and the average wall thickness T in the in-plane direction of the light emitting surface; and The pseudo-parallel light projector according to claim 2, wherein T is T ≦ 0.5E.   The lattice formed by the openings of the lattice-shaped plate is one type selected from the group consisting of a hexagonal lattice, a square lattice, and a corrugated cardboard cross-sectional shape lattice in which wavy lines are sandwiched between parallel lines. 3. A quasi-parallel light projector according to 3.   The quasi-parallel light projector according to claim 3 or 4, wherein the wall has a light-absorbing surface.   The quasi-parallel light projector according to any one of claims 2 to 5, wherein heat dissipation is improved by using a metal for the lattice-like plate.   The quasi-parallel light projector according to any one of claims 1 to 6, wherein the diffuse light planar light source is an organic EL light source.   The quasi-parallel light projector according to any one of claims 1 to 7, wherein the orientation angle control means is attached to the entire surface of the light emitting surface.   The quasi-parallel light projector according to any one of claims 1 to 8, wherein the orientation angle control means can be changed according to a use.