JP4357850B2 - Plate-shaped shade - Google Patents

Description

[0001]
【Technical field】
The present invention relates to a plate-shaped light shielding body based on a transparent substrate. More specifically, it is attached to the boundary of a room (room) to block direct sunlight from entering the indoor area, to prevent peeping indoors, and to electronic equipment (computers, mobile phones, registers, etc.) The present invention relates to an invention suitable for a screen or the like for the purpose of preventing others from peeping from an oblique direction of a display (display unit).
[0002]
Here, the blind will be mainly described as an example, but the same applies to the other display members.
[0003]
[Background]
FIG. 1 shows a side cross-sectional view of a blind that has been conventionally used for the purpose of blocking direct sunlight and preventing peeping from the outside. FIG. 1 shows a blind 14 suspended from the inside of a window glass 12 (inside the room). The blind 14 is constructed by suspending a plurality of elongated light-shielding plates (slats) 16 with strings at equal intervals. It is said that. In use, the crossing angle of the light shielding plate (slat) 16 is appropriately adjusted to shield direct sunlight incident from the outside of the room or prevent peeping.
[0004]
However, in the conventional blind 14 described above, when the light shielding plate 16 is opposed to the incident light to block the direct sunlight, the natural light desired to be taken in from the outdoor side is blocked and the indoor side becomes dark. .
[0005]
Further, as shown in FIG. 1, since the light shielding plates 16 are present at regular intervals, the outdoor visible portion from the indoor side (for example, the viewpoint of P2) is narrow (only the portions a1 to a4 in FIG. 1).
On the other hand, there was a drawback that the inside of the room could be seen from the outside of the room (for example, the viewpoint of P1) (b1 to b4 in FIG. 1).
[0006]
In addition, since the structure is such that a large number of light shielding plates 16 are exposed, there is a drawback in that they are easily contaminated with dust and are difficult to clean.
[0007]
For this reason, there has been proposed a blind that efficiently captures natural light while blocking direct sunlight by using a light shielding plate (slat) 16 as a transparent body such as a prism and reflecting and refracting incident light (Patent Document 1). (See 2nd grade).
[0008]
Moreover, a blind using a light control panel in which a condensing lens having a special shape is arranged between transparent decorative plates instead of the light shielding plate (slat) 16 is also disclosed (see Patent Document 3).
[0009]
However, the blind 14 using the former transparent light-shielding plate 16 still has difficulty in peeking from the gap of the light-shielding plate 16. Further, it is difficult to clean when it is dirty with dust, and there is a disadvantage that efficient lighting cannot be performed if it is left dirty. On the other hand, the blind using the latter light control panel has a problem that the manufacturing process is complicated because a complicated condensing lens is required.
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-301064 [Patent Document 2]
Japanese Patent Laid-Open No. 2001-32651 [Patent Document 3]
Japanese Patent Laid-Open No. 2001-82057
DISCLOSURE OF THE INVENTION
In view of the above, the present invention is a plate-shaped light-blocking body that, when applied to a blind, can block direct sunlight from entering indoors, prevent peeping into the indoors, and can take natural light. The purpose is to provide.
[0012]
Another object of the present invention is to provide a plate-shaped light-shielding body suitable as a screen that can prevent others from peeping from an oblique direction of a display (display unit) in an electronic device (a personal computer, a mobile phone, a register, etc.). With the goal.
[0013]
Another object of the present invention is to provide a plate-shaped light shield that is easy to manufacture.
[0014]
As a result of diligent efforts to solve the above problems (objectives), the present inventor has conceived a plate-shaped light shielding body having the following configuration.
[0015]
With reference to a vertically arranged state, the front transparent plate 28 and the rear transparent plate 30, and one or more intermediate transparent plates 32 sandwiched between the front transparent plate 28 and the rear transparent plate 30, A transparent plate-like body 20 constructed and integrated with
The front transparent plate 28 is a front corrugated cross section at the front plane, the rear transparent plate 30 is a front corrugated cross section and the rear flat surface, the intermediate transparent plate 32 is a double corrugated cross section, and the corrugated cross sections are reversed. The inclined linear portions of the direction are connected to each other via a linear portion f having a width,
The transparent plates 28, 30, and 32 are joined to each other between the linear portions f facing each other in the corrugated cross section to form a band-shaped joint portion 23, and the transparent plates 28, 30, and 32 are opposed to each other. , A plurality of corrugated arrangement group slits 26, 26A provided alternately with upward inclined slits 24 and downward inclined slits 22 are formed, and the inclined slits 22, 24 are air layers having a slit width of 0.01 to 5 mm, The intersecting angles α and β of the downward inclined slit 22 and the upward inclined slit 24 with the front surface 20a or the rear surface 20b of the transparent plate-like body 20 are 20 to 45 ° .
[0016]
The plate-shaped light shielding member having the above-described configuration is configured such that light incident from one end side (upper side in the illustrated example) and the other end side (lower side in the illustrated example) of the corrugated arrangement group slit 26 on the front surface is respectively the first inclined slit (downward Light that is obliquely above or below the light incident at an angle greater than the total reflection angle with respect to the inclined slit) 22 and the second inclined slit (upward inclined slit) 24 is blocked and cannot be seen through. That is, it can be seen only from a very narrow range.
[0017]
Therefore, the direct sunlight during the day can be effectively blocked, and since the base material is formed of a transparent plate-like body, natural light can be sufficiently taken.
[0018]
In addition, when applied to a screen or the like of an electronic device, it is also effective in preventing peeping from an angle.
[0019]
[0020]
[0021]
Manufacture can be facilitated simply by joining the transparent plates between the linear portions facing each other in their corrugated cross sections. In addition, the wave front in each transparent plate can be easily manufactured by shaping a flat plate with a corrugating roll immediately after extrusion.
[0022]
Incidentally, the boundary portion between the upwardly inclined slits and downward inclined slit are joined between the linear part is a flat joint, no sharp edges, it is possible to reduce the uncertainty of the blind body, mutually between the transparent plate Can be stably bonded.
[0023]
Furthermore, it is desirable to further perform light absorption / scattering treatment on the upper end surface and / or the lower end surface of the transparent plate-like body .
[0024]
When applied to the blind, it is applied only to one end (lower end surface), and in such a case, it is possible to reliably prevent the light entering the lower end surface and traveling to the indoor side from entering from above the outdoor side. Further, when applied to a screen in a display of an electronic device, irregular reflection at both end faces can be prevented, and the display due to irregular reflection does not become difficult to see.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the case where the embodiment of the present invention is applied to a blind will be described. In the present embodiment, since the plate-shaped light blocking body is a blind, the following description will be given by taking the case where the plate-shaped body is erected in the vertical direction as an example.
[0026]
One embodiment of the plate-shaped light-shielding blind of the present invention is shown in FIG.
[0027]
2 is basically between the front transparent plate 28 and the rear transparent plate 30 and between the front transparent plate 28 and the rear transparent plate 30 based on a vertically arranged state. A transparent plate-like body 20 composed of and integrated with one or a plurality of intermediate transparent plates 32 sandwiched between,
The front transparent plate 28 is a front corrugated cross section at the front plane, the rear transparent plate 30 is a front corrugated cross section and the rear flat surface, the intermediate transparent plate 32 is a double corrugated cross section, and the corrugated cross sections are reversed. The inclined straight line portions in the direction are connected to each other via a band-like joint portion (plane connecting portion) 23,
The transparent plates 28, 30, and 32 are bonded to each other between the linear portions f of the respective corrugated cross sections to form a band-shaped joint portion 23, and between the facing surfaces of the transparent plates 28, 30, and 32, A plurality of corrugated arrangement group slits 26, 26A provided alternately with the upward inclined slits 24 and the downward inclined slits 22 are formed.
[0028]
Here, the transparent material for forming (molding) the transparent plate-like body 20 is preferably a material that can transmit light and has good light resistance, and includes both colorless and colored transparent. Shall be. Usable materials (first transparent medium) are described below. Note that the refractive index n1 of the first transparent medium and the total reflection critical angle Θc when the second medium (the transparent medium having a smaller refractive index) is air (refractive index n2≈1.0) are additionally described.
[0029]
Specifically, polymethyl methacrylate (PMMA) (n1: about 1.49, Θc: about 42 °), polycarbonate (PC) (n1: about 1.59, Θc: about 39 °)), polystyrene (PS ) (N1: about 1.59, Θc: about 39 °), diethylene glycol bisallyl carbonate (n1: about 1.50, Θc: about 41 °), styrene-acrylonitrile copolymer (St-AN) (n1: about 1.57, Θc: about 40 °), styrene-methyl methacrylate copolymer (St-MMA) (n1: about 1.56, Θc: about 40 °), poly-4-methylpentene-1 (n1: about Organic glass or inorganic glass (n1: about 1.42-1.92, Θc: about 45-31 °) or the like made of 1.466, Θc: about 43 °) or the like.
[0030]
The inclined slits 22 and 24 are for changing the traveling direction of incident light. In the inclined slits 22 and 24 (that is, the voids), air usually exists. At this time, the width of the slit (gap) is not particularly limited as long as it is capable of total reflection, but it is usually set appropriately from the viewpoint of ease of forming the slit and shielding properties within a range of about 0.01 to 5 mm.
[0031]
Here, the crossing angles α and β of the downward inclined slit 22 and the upward inclined slit 24 with the front surface (light incident surface) 20a or the rear surface (light transmission surface) 20b of the transparent plate-like body are the same in the illustrated example. The crossing angle β of the upward inclined slit 24 is larger than the angle α of the downward inclined slit 22 with the intention of not being limited thereto. When applied to a display screen, it is usually the same from the viewpoint of preventing peeping from both sides. In addition, the crossing angles α and β are normally set appropriately within a range of 20 to 45 °.
[0032]
Both side surfaces of the blind body (transparent plate-like body) 20 in the light transmission direction, that is, the left side surface (outside surface) 20a and the right side surface (inside surface) 20b function as a light incident surface or a light transmission surface, respectively. That is, in the figure, when light enters from the outside (left side), the left side functions as a light incident surface, the right side functions as a light transmission surface, and conversely, the light enters from the indoor side (right side). In this case, the left side surface functions as a light transmission surface and the right side surface functions as a light incident surface.
[0033]
The action of the transparent plate will be described in more detail with reference to FIG. The case where the critical angle of the substrate is 42 ° (transparent refractive index: 1.5) will be described as an example.
[0034]
When the direct sunlight of the sun to be shielded enters from the front (outer surface) from the direction of the arrow A1, the incident angle of the sunlight usually comes from above, and thus exceeds the critical angle of 42 °. Total reflection is performed at the boundary surface of the inclined slit 22 (on the incident direction side: the same applies hereinafter). The totally reflected light beam is totally reflected again at the boundary surface of the upward inclined slit 24 in the second corrugated arrangement group slit 26 and reflected in the direction opposite to the incident direction (front side, indoor side) as indicated by a chain line. To do. As a result, the sunlight A1 is prevented from entering the room.
[0035]
Similarly, the light beam A2 incident on the boundary surface of the upward inclined slit 24 is incident on the boundary surface of the upward inclined slit 24 at a critical angle or less. Total reflection is performed at the boundary surface of the downward inclined slit 22 in the one-wave arrangement group slit 26. The totally reflected light beam is totally reflected at the boundary surface of the upward inclined slit 24 in the second corrugated group slit 26A in the same manner as the sunlight A1, and is in a direction opposite to the incident direction (front side, indoor side). reflect. As a result, the sunlight A2 is prevented from entering the room.
[0036]
A high-angle direct sunlight B incident on the boundary surface of the downward inclined slit 22 in the first corrugated group slit 26 at an angle close to the critical angle is also an upward inclined slit 24 in the second corrugated group slit 26 like a chain line. Reflects to the outside of the room while totally reflecting on the boundary surface. In Japan, it is not necessary to consider this altitude practically because the altitude in the south and south in Japan rarely exceeds 80 °.
[0037]
However, depending on the combination of the crossing angle α of the downward inclined slit 22 and the crossing angle β of the upward inclined slit 24 and the incident angle of the direct light, there may be a case where it leaks into the room and repeats total internal reflection. Although it is limited to a part of the direct light, it does not significantly impede the light shielding effect. However, the leakage light can be reduced by adjusting the crossing angle α of the downward inclined slit 22 and the crossing angle β of the upward inclined slit 24. Can do.
[0038]
Note that the crossing angle α of the downward inclined slit 22 is an angle determined by the height of direct light to be blocked. Further, for example, depending on the position of the downward inclined slit 22 where the light beam in the same direction as the arrow A3 is incident, the total reflection state is different as in the light beam of the arrow A4, and the total reflection is repeated on both the left and right side surfaces. This light is concentrated on the lower end member of the blind. As shown in the figure, the lower end member is formed with a light-absorbing coating film 27 or subjected to a light absorption / scattering treatment such as matte or serrated. If so, the purpose of shading can be achieved more reliably.
[0039]
On the other hand, when the light of the outdoor scenery to be seen through enters in the direction of arrow E or in the direction of arrow F, there is no inclined surface that causes total reflection, so that the optical axis does not shift and passes through the transparent plate 20. Will pass straight to the indoor side. Of course, to pass also the transparent plate-shaped body 20 from the outdoor side, enabling perspective from both via the transparent plate-shaped object 20 in its position.
[0040]
Accordingly, it is possible to block direct sunlight from entering the indoors, and to prevent peeping from below the outdoors.
[0041]
Next, FIG. 3 shows a cross section of a practical blind considering the case of manufacturing the blind having the configuration shown in FIG.
[0042]
A plurality of groups of virtual corrugated slit continuums 26 and 26A are formed by sandwiching one intermediate transparent plate 32 having a double-sided corrugated cross section between a front transparent plate 28 having a back corrugated cross section and a rear transparent plate 30 having a front corrugated cross section. To do.
[0043]
Here, the intermediate transparent plate 32 may have four configurations in which the entire front and rear divided bodies 32a and 32b are bonded as shown by the vertical dotted lines. The bonding surfaces of the front and rear divided bodies 32a and 32b are all bonded together and have no optical meaning. Further, the front divided body 32a has the same shape as the rear transparent plate 30 and the rear divided body 32b has the same shape as the front transparent plate 23 , respectively, and it is not necessary to manufacture (preparation) the intermediate transparent plate 32 specially.
[0044]
Each transparent plate 28, 30, 32 Mutual, simply joined at their linear portion having a width facing each waveform section of (waveform cross section is formed at the boundary portion of the inclined linear portion mutually reverse) f Therefore, it is easy to manufacture a shade blind. In addition, the wave front in each transparent plate can be easily manufactured by shaping a flat plate with a corrugating roll immediately after extrusion.
[0045]
Thus, there is no acute angle portions transparent plate-shaped object (the blind body) 20, it is possible to reduce the uncertainty of the blind body, lamination of the transparent plates therebetween (bonding) is stably possible.
In addition, since the linear part f in each transparent plate is not directly related to the function of the blind, the thickness of the linear part f may be as thin as a film (for example, 0. 01 to 1 mm) and the width is set to 0.01 to 1 mm.
[0046]
In addition to the welding method using adhesives or ultrasonic waves, the transparent plates made of transparent material can be joined using undercut irregularities provided on any surface of each transparent plate. Screwing (not shown) can be considered. If the transparent corrugated plates 2 are overlapped in a double or triple manner, the leakage light can be further reduced.
[0047]
In FIG. 4, two or more intermediate transparent plates 32, 32A, 32B, 32C having a double-sided corrugated cross section are arranged (four in the illustrated example), and between the front transparent plate 28 and the rear transparent plate 30 of the front corrugated cross section. The five waveform arrangement group slits 26, 26A, 26B, and 26C are formed.
[0048]
The sun rays G1, G2, G3, and G4 from above entering the blind body from above are totally reflected at the boundary surface of the downward inclined slit 22 of the first waveform arrangement group slit 26, and then the second The third and fourth waveform arrangement group slits 26A, 26B, 26C, and 26D are totally reflected at the respective boundary surfaces of the upward inclined slits 24 and reflected to the outdoor side to shield the light.
[0049]
In order to totally reflect all incident light, in FIG. 4, an extension line intersecting the front surface at an angle Θc corresponding to the critical angle of the base material from the starting point R on the front surface side of the downward inclined slit 22 is adjacent ( The number of transparent plates including the line connecting the intersection Y with the downward inclined slit 22 in the upper side in the example is required. In the example shown in the drawing, each transparent plate of 28, 32, 32A, 32B and 32C halves (corresponding to 30) is required from the front side.
[0050]
Therefore, in order to ensure a certain degree of light shielding, as shown in FIG. 2, two corrugated slit groups 26, 26A are provided on both sides together with single-sided corrugated front and rear transparent plates 28, 30 as shown in FIG. One corrugated intermediate transparent plate 32 is required.
[0051]
In this case, since the leakage of incident light to the upper and lower ends can be prevented theoretically, the light / absorption scattering processing at the lower end or both ends becomes unnecessary.
[0052]
Further, when the crossing angle α of the downward inclined slit 22 is increased in order to reduce the direct light blocking angle, the crossing angle α becomes close to the base material critical angle Θc, the RY becomes long, and the light is completely blocked. A large number of transparent plates necessary for superposition are required. The same applies to the upward inclined slit 24. Normally, the crossing angles α and β of the downward inclined slit 22 and the upward inclined slit 24 are the same.
[0053]
[Industrial applicability]
The technical idea of the present invention can be applied not only as a blind as described above, but also as a screen for preventing others from peeking at a display such as a personal computer or a mobile phone.
[0054]
That is, the plate-shaped light-shielding body of the present invention, as described above, in the case where it is placed horizontally in order to prevent transmission of light in a range exceeding the angle limited by total reflection at the first inclined slit and the second inclined slit. (For example, the display part of a mobile phone or a personal computer) can only see the display on the display part at a limited angle. Therefore, the plate-shaped light-shielding body of the present invention is effective for preventing peeping of the display unit in electronic devices and the like.
[0055]
Furthermore, when the plate-shaped light-shielding body is formed into a circular shape or a regular polygon shape, and applied as a projector (front glass) in a lighthouse, a searchlight, etc. Light projection without light leakage is possible.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a shape of a conventional blind.
FIG. 2 is a cross-sectional view showing an embodiment of a plate-shaped light-shielding blind according to the present invention.
FIG. 3 is a structural cross-sectional view suitable for manufacturing the plate-shaped light-shielding blind in FIG. 2;
4 is a structural cross-sectional view of a plurality of intermediate transparent plates in FIG.
[Explanation of symbols]
20, 20A ... Transparent plate (Blind body)
22 ... Downward inclined slit 23 ... Band-shaped joint 24 ... Upward inclined slit 26, 26A, 26B, 26C ... Waveform arrangement group slit 27 ... Light-absorbing coating film 28 ... Pre-transparent Plate 30... Rear transparent plate 32, 32A, 32B... Intermediate transparent plate f.
α: Crossing angle of downward inclined slit β ... Crossing angle of upward inclined slit

Claims (3)

Based on the vertically arranged state as a reference, the front transparent plate (28) and the rear transparent plate (30) and one piece sandwiched between the front transparent plate (28) and the rear transparent plate (30) or A transparent plate-like body (20) composed of and integrated with a plurality of intermediate transparent plates (32),
The front transparent plate (28) is a front corrugated cross section at the front plane, the rear transparent plate (30) is a front corrugated cross section at the rear plane, and the intermediate transparent plate (32) is a double corrugated cross section, and Each of the corrugated cross-sections are connected to each other through linear portions (f) having inclined linear portions in opposite directions,
The transparent plates (28), (30), (32) are joined together between the linear portions (f) facing each other in their corrugated cross-sections to form strip-like joint portions (23), Between the opposing faces of the transparent plates (28), (30), (32), there are corrugated arrangement group slits (26), (26A) comprising alternately upward inclined slits (24) and downward inclined slits (22). A plurality of the inclined slits (22) and (24) are formed as an air layer having a slit width of 0.01 to 5 mm, and the transparent plate-like body (20) of the downward inclined slit (22) and the upward inclined slit (24) is provided. The plate-shaped light-shielding body is characterized in that the crossing angle (α, β) with the front surface (20a) or the rear surface (20b) is 20 to 45 ° . The plate-shaped light-shielding body according to claim 1, wherein the intermediate transparent plate (32) is an entire bonded body of the front and rear divided bodies (32a), (32b) . The plate-like light-shielding body according to claim 1 or 2, wherein a light absorption / scattering treatment (27) is further applied to an upper end surface and / or a lower end surface of the transparent plate-like body (20) .

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