JP2003151311A - Vehicular lamp equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide vehicular lamp equipment achieving a unique appearance design and permitting the observation of a uniform and high quality appearance plane with a intensified feeling of depth during light-off. SOLUTION: The vehicular lamp equipment with a light source arranged therein and a lamp chamber having a light emission opening comprises a lamp cover mounted in the light emission opening of the lamp chamber and a selective polarization layer further provided on the inner face of the lamp cover with structural portions having finely irregular structure surfaces and non-structural portions having no such irregular structures formed in a predetermined pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more specifically to a vehicular lamp whose appearance is further improved by changing the appearance of the lamp chamber. INDUSTRIAL APPLICABILITY The vehicular lamp of the present invention can be advantageously used as a rear combination lamp for passenger cars.

[0002]

2. Description of the Related Art In recent years, automobile lamps have been required to have an improved appearance in a lamp chamber both when the lamp is turned on and when the lamp is turned off, in addition to its original function as a lighting means.

Conventionally, various techniques have been adopted to improve the appearance of the lamp chamber. In general, the surface of the lamp cover that is not processed and the surface that is not processed are alternately arranged so that the inner surface of the housing at the back of the lamp chamber can be seen through on the surface that is not processed. A method is adopted in which the surface is mainly visually recognized, and as a result, the sense of depth of the lamp chamber itself can be emphasized. However, in this method, since the lamp cover is formed by resin injection molding, the lens pattern is rough (1 m
(a large pitch of about m to several mm), and the pitch is visually recognized as an eyesore.

Further, in order to improve the visibility from the rear of the turn signal lamp attached to the corner portion of the vehicle body, a prism-shaped lens is often provided on the cover surface,
This can only improve the functional aspect, not the appearance. Further, since the prismatic lens is formed by injection molding of resin, the pattern of the lens is rough and the pitch is unpleasant.

[0005]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art as described above, and is capable of sufficiently exhibiting the function as a lamp when lit, and has an unprecedented appearance design. It is an object of the present invention to provide a vehicular lamp capable of achieving a high quality and observing a uniform and high-quality exterior surface with a sense of depth coordinated when turned off.

Another object of the present invention is a vehicle in which the lamp of the present invention can be completed by simply making a simple improvement to an existing lamp and, if necessary, various appearance variations can be easily realized. The purpose is to provide lighting equipment.

[0007]

According to the present invention, there is provided a vehicular lamp including a lamp chamber in which at least one light source is arranged and which has a light emitting opening. A transparent lamp cover having a shape and a size at least covering the light emitting surface of the lamp is attached to the light emitting opening of the lamp chamber, and a fine uneven structure surface is provided on the inner surface of the lamp cover. This can be achieved by a vehicular lamp characterized in that a selective polarization layer in which a structural portion and a non-structural portion that does not have such a concavo-convex structure are formed in a predetermined pattern is further provided.

In the vehicular lamp of the present invention, the selective polarizing layer may be provided on the inner surface of the lamp cover in various forms, as described in detail below. For example, on the inner surface of the lamp cover, a selective polarizing layer may be formed by partially attaching or adhering a polarizing film having an uneven structure surface corresponding to a structure portion having a fine uneven structure surface. it can. Alternatively, prepare a polarizing film having a structure part having a fine uneven structure surface and a pattern of a non-structure part having no such structure surface, and sticking the polarizing film on the inner surface of the lamp cover. For example, the selective polarizing layer can be formed. Otherwise, the selective polarization layer is formed by directly processing the inner surface of the lamp cover, that is, by processing or transferring the pattern of the structural portion and the non-structural portion on the inner surface of the lamp cover. You can

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The vehicular lamp according to the present invention can be used in various vehicles as lighting means, signal means, and the like. Suitable vehicles include, but are not limited to, those listed below, including passenger cars (including RVs, campers, etc.), buses, trucks, etc., but with improved exterior design. Therefore, a passenger car is particularly suitable as a target. Furthermore, the vehicular lamp of the present invention can have any form.
That is, the lamp may include one lamp chamber or a plurality of lamp chambers (combination lamp). In some cases, the lamp of the present invention is
Instead of the structure in which the light source is provided in the lamp chamber, a flat lamp structure may be used as the light source and a thin lamp structure integrated with the lamp cover may be used.

The vehicular lamp of the present invention usually has a structure in which a light source is provided in the lamp chamber. At least one light source is arranged in the lamp chamber. Also, at least 2 lamps
It is also possible to provide individual lamp chambers and to arrange a light source having an appropriate brightness in each lamp chamber. Depending on the case, two or more light sources may be arranged in one lamp chamber. Also,
The inner wall of the lamp chamber may have a structure such as a concave mirror so that the light from the light source may be condensed. Otherwise, a concave mirror or similar light reflecting means is provided as a reflector in addition to the inner wall. May be.

In the vehicular lamp of the invention, if it takes the form of a combination lamp, it is preferable to arrange the lamp chambers adjacent to each other and in relation to each other. Specifically, the lamp chamber includes, but is not limited to those listed below, a red stop lamp / tail lamp, an amber turn signal lamp, and a colorless backup lamp. Also,
If necessary, a fog lamp, a clearance lamp, etc. may be incorporated in the lamp.

If the vehicle lamp of the present invention is a combination lamp in which at least two lamp chambers are combined, the lamp chambers may have the same shape and size, or otherwise have different shapes. And may have a size. In the lighting fixture, the combination of lamp chambers can be changed arbitrarily, but in order to improve visibility and design, and to realize a sense of unity with the vehicle body, etc., it is almost straight in the vertical direction or in the horizontal direction. It is preferable to arrange them in a straight line, otherwise in a block. However, if necessary, changes may be made such that two or more lamp chambers having different shapes and sizes are nonlinearly compacted.

As an example, the vehicular lamp of the present invention can be formed by incorporating at least two lamps of a stop lamp / tail lamp, a turn signal lamp and a backup lamp in an arbitrary pattern and combination.
In general, the stop lamp / tail lamp, the turn signal lamp and the backup lamp can be arranged in this order or in a different order and arranged vertically or horizontally. Further, as a modified example, a relatively long stop lamp / tail lamp may be arranged in one row, and the turn signal lamp and the backup lamp may be arranged in the rows adjacent to each other with the same length in total.

FIG. 1 is a sectional view showing one structural example of a vehicular lamp according to the present invention. Hereinafter, the details of the vehicular lamp of the present invention will be described with reference to this drawing.

The illustrated lamp 20 has a lamp chamber 21 for an amber turn signal lamp. Lamp room 2
1, a light source (bulb) 22 having a predetermined brightness is fitted in a socket (not shown). The front surface of the lamp chamber 21 is opened, and a light emitting opening 25 is formed. Further, a concave mirror structure 21a is provided on the bottom wall of the lamp chamber 21 around the light source 22, and collects the light of the light source 22 and emits the light from the light emitting opening 25 to the outside (arrow L).
Can be referred to). Further, the light emitting opening 25 of the lamp chamber 21 is provided with the lamp cover 10 colored in amber. Furthermore, a film-shaped selective polarization layer 11 is attached to the inner surface of the lamp cover 10 with the fine concavo-convex structure facing the light source side.

FIG. 2 is an enlarged view of the vicinity of the lamp cover 10 and the selective polarization layer 11 of the lamp 20 of FIG. As shown in the figure, the selective polarizing layer 11 cuts a polarizing film having a fine concavo-convex structure on the surface and attaches it via the adhesive layer 12, and uses this as the structural portion 11A and also between the structural portions 11A. The space is left as it is, and the unstructured portion 11B is formed. The polarizing film used for forming the structure portion 11A is a prism sheet of 3M Company, BEF series, as described below,
Therefore, the base material 1 made of a polyester film,
It is composed of a linear acrylic prism sheet 2 formed thereon. The polarizing film 2 used here has a thickness t of about 200 μm, an apex angle α of 90 °, and a prism pitch p of 50 μm. Although the polarizing film piece is attached to the lamp cover 10 via the adhesive layer 12 in the illustrated example, it may be attached by another means if necessary.

In the vehicle lamp of the present invention, as shown in the drawing,
A lamp cover is attached to the light exit opening of the lamp chamber. The lamp cover is not particularly limited as long as it has a shape and size that at least covers the light emitting surface of the lamp chamber, but is generally rectangular, square or circular, and in some cases, It may have a deformed pattern such as an L-shape.

The lamp cover may be colored with a different hue for each lamp chamber as required, that is, depending on the hue of the light emitted from the lamp cover. For example, the cover of a stop lamp / tail lamp that requires red light emission is colored red, and the cover of a turn signal lamp that requires amber light emission is colored amber. Alternatively, instead of coloring the cover, a colorless cover may be used with a colored lamp or else a colored cap may be wrapped around the colorless lamp. By using such an alternative method, it is possible to obtain an appearance different from that using the colored cover. Of course, the cover of the colorless backup lamp need not be colored.

A colorless or colored lamp cover is
It can be advantageously formed by molding from any light transmissive resin. Suitable molding methods include conventional molding methods such as injection molding and vacuum molding. The raw material resin used for molding is not limited to those listed below, but examples thereof include a styrene resin, a hard vinyl chloride resin, an acrylic resin, and a polycarbonate resin. In particular, acrylic resin can be advantageously used. This is because it has excellent strength and transparency and can be advantageously subjected to coloring.

Further, in the case of producing a colored lamp cover, it is possible to mix an appropriate amount of the colorant with the resin raw material as described above. Suitable colorants include, but are not limited to, those listed below, pigments such as perylene pigments, azo pigments, iron oxides, or quinophthalone dyes, azo dyes, disazo dyes, anthraquinone dyes, benzopyran dyes, etc. Dyes (all from the color index) can be mentioned. In the practice of the present invention, dyes such as azo dyes and disazo dyes can be particularly advantageously used because they are excellent in dispersibility in a resin and have good color developability, transparency and weather resistance.

In the manufacture of the lamp cover, the resin raw material may be mixed with additives commonly used in the field of plastic molding, in addition to the colorant. Examples of suitable additives include ultraviolet absorbers, light stabilizers, and heat stabilizers. For example, suitable UV absorbers include, but are not limited to, those listed below, including benzotriazoles, benzophenones, diphenyl acrylates, amine UV absorbers, and the like.

The lamp cover has an inner surface (a surface on the light source side).
An uneven pattern may be provided on the. This is because the concavo-convex pattern provides a function as a lens body or a retroreflective function. The concavo-convex pattern can be transferred from the mold to the molded body (lamp cover) at the molding stage, for example, by imparting the pattern to the mold.

The lamp cover is usually manufactured by molding from a light-transmissive resin as described above, but if it is desired to obtain a high-class feeling or for other purposes, it may be manufactured from an inorganic material such as glass. .

In the lamp of the present invention, a selective polarizing layer is further provided on the inner surface of the lamp cover. The selective polarization layer refers to a layer that has a partial polarization effect, and thus
It means a layer in which a structure part having a fine concavo-convex structure surface (this part participates in polarization) and a non-structure part having no such concavo-convex structure are formed in a predetermined pattern. . The term “layer”, when used in the present specification, means not only the form of a thin layer such as a thin film or a film but also a form such as a film or a sheet, and further,
As a special example, it also means a region having a relatively small thickness included in one member.

The selective polarizing layer can be advantageously formed by partially applying a polarizing film having a concavo-convex structure surface corresponding to the structure part to the inner surface of the lamp cover.
For example, after the polarizing film is cut into a predetermined shape and size, the obtained polarizing film piece can be attached to or along the inner surface of the lamp cover. An example of this method has been described above with reference to FIG.

Alternatively, the selective polarizing layer can be advantageously formed by applying a polarizing film having a pattern of its structural and non-structural parts to the inner surface of the lamp cover. For example, as shown in FIG. 3, after the unevenness structure is partially removed from the surface of the polarizing film, the obtained product can be attached to or along the inner surface of the lamp cover. As shown in the figure, the concavo-convex structure portion of the polarizing film is used for forming the structure portion 11A, and the portion from which the concavo-convex structure is removed is used as the non-structure portion 11B. In the case of this example, instead of using the adhesive layer 12, the polarizing film is attached to the lamp cover 10 by another means.
May be attached to.

To further describe the polarizing film that is advantageously used in the practice of the present invention, the polarizing film may consist of a single film or sheet, so long as the desired polarizing effect is obtained. It may be composed of a substrate and a polarizing layer formed on the substrate. In the latter case, the substrate is usually a smooth film or sheet, and the polarizing layer thereon is a film or sheet having a fine uneven structure. The polarizing film may optionally have additional layers, if desired.

The polarizing film is preferably formed of a transparent material. The transparent material used for forming the polarizing film is, for example, a polyester film, a polyethylene film, a polycarbonate film, a vinyl chloride film, an acrylic film, a polyurethane film, a polyolefin film, a vinylidene fluoride film, or the like. The polarizing film can be manufactured to have a desired film thickness by mixing a raw material resin and, if necessary, a coloring agent and the like, and then using a conventional molding method such as a calender molding method. Although the thickness of the polarizing film can be widely changed according to the usage area of the lamp cover,
Usually, it is in the range of about 5 to 500 μm, and more preferably in the range of about 20 to 100 μm. If the thickness of the polarizing film is less than 5 μm, it is no longer possible to obtain a film. On the other hand, if it exceeds 500 μm, the thickness is increased, which may adversely affect the effects of the present invention.

The polarizing film preferably transmits P-polarized light and reflects S-polarized light, and the reflected S-polarized light is
It has an optical property of transmitting the polarizing film after the polarization is canceled by multiple reflection. Such an optical characteristic is preferably such that, as the concavo-convex structure of the polarizing film, either a linear triangle prism or a corner between adjacent triangles of the prism of the linear triangle prism is rounded, or both are rounded. A pseudo-triangular prism,
Alternatively, the triangular prisms can be obtained by selecting a prism having a shape corresponding to a shape obtained by removing a part of a pseudo-triangular prism, a kamaboko prism, a pyramidal triangular pyramid or quadrangular pyramid prism, or a combination thereof. it can. The linear prism is
In particular, the inside looks like a double image, which is suitable for improving the stereoscopic effect. Incidentally, these prisms may be such that the apex angle portions thereof are partially removed or the corners between the prism elements are rounded, if a special effect is desired.

The polarizing film having the above-mentioned optical characteristics is usually used as an optical element for a backlight in a panel type liquid crystal display device, and is commercially available as a prism sheet, a lens film or the like. A particularly suitable polarizing film is a brightness enhancement film.
The brightness enhancement film is, for example, manufactured by 3M under the trade name "BE.
It is commercially available as "F" series, "RBEF" series, and the like. These brightness enhancement films are usually subjected to fine linear prism processing of about several tens of μm. Further, it is preferable to dispose the prism surface of such a polarizing film on the light source side, and it is also effective in terms of uniformity that the surface opposite to the prism surface has low gloss.

The prism sheet used for forming the selective polarizing layer in the present invention will be generally described with reference to FIGS. 2 and 3. The sheet thickness t is usually about 5 to 500 μm.
The range is preferably about 100 to 250 μm, and more preferably about 150 to 200 μm. The pitch p of the prism is usually 1 m.
m or less, preferably in the range of about 10 to 500 μm, and more preferably in the range of about 24 to 250 μm. If the pitch p is too large, the presence of the pitch becomes too conspicuous and hinders the improvement of appearance, which is not preferable.
Further, the apex angle α of the prism is usually 150 ° or less, preferably in the range of about 50 to 120 °, and more preferably in the range of about 70 to 100 °. If the apex angle α of the prism is too small, there is no problem, but if it is too large, the improvement in stereoscopic effect due to image misalignment decreases.
Not preferable. In the structure of the prisms, the prisms may be arranged regularly or randomly, and the pitch may not be uniform as well. Further, the apex angle of the prism may be rounded (r may be added).

The polarizing film is usually attached to the cover body via an adhesive layer. The adhesive layer used here can be formed using an adhesive that is commonly used in the field of adhesive tapes, pressure-sensitive adhesive tapes, and the like, for example, pressure-sensitive type, heat-sensitive type, and photo-curing type adhesives. Suitable adhesives include, for example, acrylic adhesives, polyurethane adhesives, polyester adhesives, etc. When weather resistance and the like are taken into consideration, acrylic adhesives are particularly preferably used. it can. Although the thickness of such an adhesive layer can be varied over a wide range, it is usually in the range of about 10 to 500 μm, and more preferably in the range of about 20 to 100 μm. If the thickness of the adhesive layer is less than 10 μm, a satisfactory adhesive force cannot be obtained, and if it exceeds 500 μm, the entire thickness of the polarizing film becomes very large, which is not preferable. In fact, when a polarizing film is attached to the lamp cover, a sense of discomfort appears with the resin of the cover.
If desired, the polarizing film may be attached to the lamp cover in a manner that does not use an adhesive layer.

In the vehicle lamp of the present invention, the selective polarizing layer may be formed without using the polarizing film. For example, the selective polarizing layer can be formed by processing the pattern of the structural portion and the non-structural portion of the selective polarizing layer on the inner surface of the lamp cover. This method is usually carried out in the molding of the lamp cover, for example, by preliminarily imparting a structural / non-structural pattern to the molding die,
This can be advantageously carried out by transferring the pattern from the mold to the molded body (lamp cover). Instead of using molds,
It may be shaped by pressing a metal plate. FIG. 4 schematically shows such an example. On one surface of the lamp cover 10, as in the case described above with reference to FIG. 2 and FIG. 3, a selective polarization layer formed by repeating the structural portion 11A and the non-structural portion 11B (however, in the illustrated example, the selective polarization layer is formed). (In the form of regions) are formed.

In the vehicular lamp of the present invention, the selective polarizing layer provided on the lamp cover is usually 5% to 90% in "passing rate" defined by the area ratio of the non-structural portion and the structural portion.
It is preferable to have a value in the range. More preferably, the penetration rate is in the range of 10-85%, most preferably 20-70%.

The selective polarizing layer may also have an arbitrary pattern of non-structured portions and structural portions as long as the above-mentioned permeability is ensured, and thus can have an arbitrary pattern. Suitable patterns include, but are not limited to, those listed below, including stripes, round holes, dots, triangular holes, square holes, lattice holes, checkerboard patterns, and the like. As one deformation of the stripe, a pattern in which thin lines are sparsely distributed is also effective. If necessary, these patterns may be combined and applied to the selective polarizing layer. These patterns may constitute non-structural parts, or else structural parts. The size of each pattern can be arbitrarily changed depending on the design effect desired to be exhibited.

FIG. 5 is a plan view showing an example of the pattern of the selective polarizing layer. The selective polarization layer 11 of FIG. 5A is an example in which the stripe-shaped structure portion 11A and the stripe-shaped non-structure portion 11B are repeated at the same pitch p to form a stripe-shaped pattern. In addition, the selective polarization layer 11 of FIG. 5B is an example in which a solid structure portion 11A is formed by repeating round hole-shaped non-structure portions 11B at the same pitch p to form a perforated pattern. Further, the selective polarization layer 11 in FIG. 5C is an example in which a square structure portion 11A and a square non-structure portion 11B having the same size are repeated at the same pitch p to form a checkered pattern.

The pattern shown in the figure can be formed by various techniques. For example, as described above, the prepared polarizing film may be cut and the obtained polarizing film piece may be attached to the lamp cover, or otherwise, the uneven surface structure of the polarizing film may be partially removed. After the removal, the surface-treated polarizing film may be attached to the lamp cover. Alternatively, the polarizing film may be punched or the like to open non-structured portions such as stripes, lattices, and dots, or otherwise,
You may put a slit etc. in a polarizing film.

In the vehicle lamp of the present invention, any optical element may be arranged between the light source and the lamp cover in the lamp chamber. Suitable optical elements are, for example, filter elements. This is because, for example, by interposing a colored filter element, a unique appearance effect derived from the filter can be obtained. The filter element may be a plastic film or sheet or plate or a glass plate.

FIG. 6 is a sectional view showing an example in which the lamp of the present invention is applied to a rear combination lamp. The illustrated rear combination lamp 20 has two lamp chambers,
That is, it has a structure in which a lamp chamber 21R for a red stop lamp and a tail lamp and a lamp chamber 21A for an amber turn signal lamp are combined. Each lamp chamber is partitioned from each other by a partition wall 23,
In addition, each lamp chamber has a light source 2 with a predetermined brightness.
2 is embedded. The front surface of each lamp chamber is opened, and a light emitting opening 25 is formed. Further, in each lamp chamber, a concave mirror structure is provided on the bottom wall around the light source 22, so that the light of the light source 22 can be condensed and emitted from the light emitting opening 25 to the outside. Further, a common lamp cover 10 is attached to the light emitting opening 25 of each lamp chamber.
The lamp cover 10 has red (R) and amber (A) color tones according to the light emission color of each lamp chamber. The lamp cover 10 is attached to the lamp chamber 21 by the edging 24.

The lamp cover 1 of amber color (A)
On the inner surface of 0, the selective polarization layer 11 is attached with the concavo-convex structure facing the light source side. The selective polarizing layer 11 is formed by cutting and adhering a polarizing film (here, a prism sheet manufactured by 3M Co., RBEF series) having a fine stripe-shaped concavo-convex structure on the surface, and is attached to the lamp chamber 21A.
Although it is difficult to visually recognize the prism structure of the selective polarization layer 11 from the outside with the naked eye, as shown in FIG. 7, the stripe-shaped structure portion 11A and the non-structure portion 1 are formed.
1B are arranged alternately.

When the lamp of the present invention with the selective polarization layer described in detail above is used, an excellent appearance rich in variety can be obtained according to the change of the incident angle of light or the change of the visual angle of the observer. You can 8 is an amber lamp chamber 2 of the rear combination lamp shown in FIG.
FIG. 1B is a horizontal cross-sectional view schematically showing a structural portion of 1A.
The light emitted from the light source 22 has its angle changed by the fine structure of the structure portion 11A of the polarizing film and is emitted from the surface of the lamp cover 10 at an angle β. Specifically, as the structure portion (polarizing film), the prism film 1 shown in Table 1 below is used.
, The light emission angle β is about 20 °, and
When using the prism film 4, it is about 30 °. The direction of light emission is the emission optical axis included in the plane including the axis in the plane of the polarizing film orthogonal to the longitudinal direction of the prism structure and the incident optical axis.

On the other hand, FIG. 9 is a horizontal sectional view schematically showing the non-structural portion of the same amber lamp chamber 21A as that of FIG. As shown, the light emitted from the light source 22 is
It is emitted from the surface of the lamp cover 10 as it is without changing the angle.

The vehicular lamp of the present invention has been described above with reference to its preferred embodiment. As is apparent from the above, the lamp of the present invention has, on the inner surface of a smooth lamp cover, a fine prism film such as that used in a liquid crystal panel backlight, which is adhered or arranged along, If not, it is characterized in that the inner surface of the lamp cover is processed in a similar manner. For example, in the case of a lamp in which prism sheets having a pitch of several tens of μm are repeatedly arranged on the inner surface of a lamp cover at intervals of 1 cm to several cm, the sheet can be seen on the surface with the prism sheet (structure part) and the surface without the prism sheet (non- Since the interior of the lamp chamber can be seen from the structure part, an appearance with a sense of depth can be obtained as in the conventional method. Furthermore, in the lamp of the present invention, since the pitch of the prism sheet is fine, it does not appear that prism processing is applied to the surface of the sheet,
A homogeneous and high quality appearance surface is obtained. Furthermore, when turned on, it has been experienced that the light source appears to float above the surface without the sheet, especially on the surface with the prism sheet, when viewed from an angle, due to the accurate optical path angle control function of the fine prism. You get a completely new look that you've never seen. Such an effect is the same for the rear visibility of the turn signal lamp provided at the corner portion. In the conventional method, there was a drawback that the pitch of the prism can be seen visually, in the lamp of the present invention,
Since it is not known that the prism sheet is applied, a high quality and new appearance can be obtained. Furthermore, since the method of attaching and attaching the prism sheet is adopted, it is possible to easily process the existing lamp to improve it into the product of the present invention. You can select various appearance variations by changing the layout method.

[0044]

The present invention will be described in detail below with reference to its examples. It should be understood that the present invention is not limited to the examples below. Examples 1 to 17 and Comparative Examples 1 to 4 Nine kinds of polarizing films as shown in Table 1 below were prepared. The polarizing film prepared in this example is a prism film manufactured by Sumitomo 3M Limited (brand name is described in the name column), unless otherwise specified. Both prism films have a prism structure (structure surface) only on one side,
The other side was smooth. The structural surface is such that fine prisms are arranged in a linear shape such that triangles having a vertical cross section shown in Table 1 are arranged. After laminating a 40 μm-thick acrylic adhesive on the smooth surface of each prism film, it was cut in a direction orthogonal to the longitudinal direction of the prism to have a length of about 100 mm. The width of the obtained prism film piece (this corresponds to the “structure portion” in the present invention) is as shown in Table 2.

[0045]

[Table 1]

Each prism film piece is used as a rear combination lamp of a passenger car (lamp chamber of a turn signal lamp, size of opening: width 12 cm × height 9 cm)
On the inner surface of the amber-colored lamp cover (both sides are smooth), a plurality of lamps were attached side by side so that the prism surface was directed toward the light source side and the lateral direction of the lamp was longitudinal. The interval between the adjacent film pieces (this corresponds to the "non-structural portion" in the present invention) is as described in the "Gap" column of Table 2 below, and the entire surface of the lamp cover is
This means that as many prism film pieces as possible were stuck in the height direction. In each lamp cover, the surface without film (non-structured part) and the surface with film (structured part)
As a result, a striped lamp light-emitting surface in which was alternately arranged was obtained. The penetration rate defined by the area ratio of the non-structural portion and the structural portion for each lamp emission surface is as shown in Table 2. In Comparative Example 1, the width of the prism film piece was the same as the height of the opening of 9 cm, and the light emitting surface of the lamp was entirely covered with the prism film. That is, in Comparative Example 1, the penetration rate (defined by the area ratio between the non-structured portion and the structured portion) was 0%. Moreover, in Comparative Example 4, since the prism film piece was not attached, the penetration rate was 100%.

Then, the rear combination lamp manufactured as described above was subjected to the following three items: A, B and C.
Was visually evaluated based on the evaluation criteria as described above. [Evaluation item A] How the structure of the lens part or the prism part itself looks when the light is turned on and off. Evaluation Criteria: A: The structure pattern is so fine that the structure itself cannot be seen. It looks uniform in the structure.

O: The structure pattern is fine, and the structure itself is almost invisible. It looks almost uniform in the structure.

Δ: The structure pattern is slightly rough and the structure is visible. It looks uneven within the structure.

X: The structure pattern is large, and the structure itself is clearly visible. It looks uneven in the structure. [Evaluation item B] Appearance of the entire light emitting unit when the light is turned on. In particular, observe the contrast and the sense of depth between the light emitted through the structural part where the lens or prism is applied and the light emitted through the part (non-structural part) where it is not applied. Evaluation Criteria: ◎ ... Both the light source visible through the structural part and the light source visible through the non-structural part are sufficiently large and appear as distinct images at different positions, and the brightness and the position of the image are both viewed. It changes with the movement. There is a great deal of contrast and depth.

O ... The light source visible through the structural part and the light source visible through the non-structural part are at different positions as images.
It looks heavy, and both the brightness and the position of the image change as the viewpoint moves. There is contrast and depth.

Δ ... The light source visible through the structural part and the light source visible through the non-structural part are at different positions as images.
It looks heavy, and both the brightness and the position of the image change as the viewpoint moves. However, since the area ratios of the structure portion and the non-structure portion are biased, the contrast and the sense of depth can be obtained only to some extent.

Δ ^* ... The image of the light source can be seen only through the non-structure part, and only the brightness changes through the viewpoint movement through the structure part. You can only get a certain amount of contrast and depth.

×: There is no remarkable contrast or depth feeling. [Evaluation item C] Appearance of the entire lamp surface when the light is turned off. In particular, observe the contrast and depth of the surface of the structure where the lens or prism is applied and the surface where it is not applied (surface of the non-structure). Evaluation Criteria: ⊚ ... There is no transparency on the surface of the structure portion, and there is a remarkable contrast and a sense of depth due to the transparency of the surface of the non-structure portion.

◯: The structure surface has no transparency, and the non-structure surface has a transparency and a sense of depth.

Δ: The structure portion surface has no transparency and the non-structure portion surface has a contrast, but the area ratio of the structure portion and the non-structure portion is uneven, so that a sense of depth can be obtained to some extent. Absent.

Δ ^{** Since the} structure portion surface has a certain degree of see-through property, the contrast and depth feeling with the non-structure portion surface can be obtained only to some extent.

×: There is no noteworthy contrast or depth feeling.

As a result of a series of evaluation tests, the evaluation results shown in Table 2 below were obtained. Comparative Example 5 The procedure described in Examples 1 to 17 was repeated, but in this example, instead of using a prism film together, for comparison, as shown in Table 2 below, fisheye lens-like irregularities were used. A lamp cover with a pattern was used. That is, in this example, a lamp cover for a rear combination lamp of a passenger car, both surfaces of which are smooth, and a portion where a fish-eye lens-like convex portion is provided on the inner surface side are alternately arranged in a stripe shape. I used one with a different design. The concavo-convex design was formed at the same time when the cover body was formed by injection molding of acrylic resin. One size of the fish-eye lens-like convex portion was 4 mm × 6 mm, and the bare penetration rate (area ratio of the lens-free portion on the light emitting surface) was 73%.

As a result of the same evaluation test as in the above-mentioned Examples, the evaluation results as shown in Table 2 below were obtained. Comparative Example 6 The method described in Comparative Example 5 was repeated, but in this example,
One size of the fish-eye lens-like convex portion is 5 mm × 8 mm as described in Table 2 below, and the penetration rate (area ratio of the lens-free portion on the light emitting surface) is 7 mm.
It was 3%.

As a result of the same evaluation test as in the above-mentioned Examples, the evaluation results as shown in Table 2 below were obtained. Comparative Example 7 The method described in Examples 1 to 17 was repeated, but in this example, for comparison, instead of the lamp cover of the rear combination lamp of the passenger car, the lamp cover of the turn signal lamp used in the front corner portion. It was used. Also, instead of using a prism film together with the lamp cover,
A lamp cover with a linear prism structure was used as described in Table 2 below. That is, in this example, a prism having a structure in which prisms are arranged linearly on the inner surface of the lamp cover, the triangles having a vertical angle of about 90 ° and a pitch of about 1.5 mm are arranged linearly, is orthogonal to the prism longitudinal direction. The ridges of the prism were cut into a smooth surface with a width of 5 mm every 10 mm along the direction. As a result, on the light emitting surface of the lamp, a smooth surface in which the inside of the lamp chamber can be seen through and a surface having the prism structure are alternately arranged in stripes. In this lamp cover, the penetration rate (the area ratio of the portion having no lens on the light emitting surface) was 50%.

As a result of the same evaluation test as in the above-mentioned Examples, the evaluation results as shown in Table 2 below were obtained. Example 18 The procedure described in Examples 1 to 17 was repeated, but in this example, a colorless transparent U was used on the structural surface side of the prism film 1 described in Table 1 by using the silk screen printing method.
A V-curable clear paint (manufactured by Mitsubishi Rayon Co., Ltd., trade name "Diabeam FS-2260") was printed and cured with a UV irradiation machine. Silk screen version is 8mm x 100mm
5 has a shape in which every 15 mm of ink permeation surface is lined up, and this is placed on the film so that the longitudinal direction of the permeation surface and the longitudinal direction of the prism structure of the film are orthogonal to each other. The hardened clear paint is the height of the prism structure (about 4
3 μm) and the surface was almost smooth. As a result, a prism film was obtained in which a surface having a prism structure having a width of 8 mm and a non-structure surface having a width of 8 mm were alternately arranged in stripes.

A prism film having the same structure as this was cut into 8 mm width masking tape (combining an adhesive layer and paper or a backing film such as vinyl chloride) at an interval of 8 mm on the prism film 1. It was prepared by arranging and sticking to The above clear paint was applied to the entire surface of the film with the masking tape applied thereto by screen printing, bar coat printing or spray printing, and then cured with a UV irradiator, and the masking tape was peeled off.

The obtained prism film was adhered to the inner surface of the lamp cover of the rear combination lamp of the passenger car (the lamp chamber of the turn signal lamp, the size of the opening: 12 cm in width and 9 cm in height) in the same manner as in the above example. . The application conditions are as shown in Table 2 below.

As a result of the same evaluation test as in the above-mentioned Examples, the evaluation results as shown in Table 2 below were obtained. Example 19 The method described in Examples 1 to 17 was repeated, but in this example, on the structural surface side of the prism film 6 described in Table 1, the thickness was about 1 mm and the size was about 110 mm × 8 mm. The metal plate was pressed so that the prism structure longitudinal direction of the film was orthogonal to this metal plate. The metal plate is about 230
It was in a state of being heated to ˜270 ° C., and a jig was also used for pressing. Then, the metal plate pressed against the film was peeled off after cooling. Since the pressing surface of the metal plate was finished in a state close to a mirror surface, the prism structure of the film was flattened by being crushed by heat and pressure.
Furthermore, the surface of the metal plate was transferred to form a smooth surface. By performing this every about 16 mm, a film in which a surface having a prism structure having a width of 8 mm and a non-structure surface having a width of 8 mm were alternately arranged in a stripe shape was obtained.

The obtained prism film was attached to the inner surface of the lamp cover of the rear combination lamp (lamp chamber of the turn signal lamp, size of opening: width 12 cm × height 9 cm) of the passenger car in the same manner as in the above-mentioned example. .

As a result of the same evaluation test as in the above-mentioned Examples, the evaluation results as shown in Table 2 below were obtained. Example 20 The procedure described in Examples 1 to 17 was repeated, but in this example, a lamp cover provided with a linear prism structure was used as follows instead of using a prism film together with the lamp cover. It was made and used.

Rear combination lamps for passenger cars (lamp chamber for turn signal lamps, size of opening: width 1
2 cm x 9 cm height) made of acrylic resin lamp cover (both sides are smooth) and a metal plate with a thickness of about 1 mm and a size of about 110 mm x 8 mm bent along the inner surface side of the lamp cover. Prepared. The metal plate was heated to about 200 to 250 ° C. and pressed against the inner surface of the lamp cover using an appropriate jig. On the pressing surface of the metal plate, fine prisms such as triangles having a vertical angle of about 90 ° and a pitch of about 50 μm are arranged in advance in a linear shape in the direction orthogonal to the longitudinal direction of the metal plate. The structure is arranged in. As a result of this pushing process,
The surface microstructure of the metal plate was transferred to the inner surface of the cover. By applying this every about 16 mm, a lamp cover was obtained in which the surface having the prism structure on the light emitting surface of the lamp and the surface through which the interior of the lamp chamber was seen through were alternately arranged in stripes.

The obtained lamp cover was attached to a rear combination lamp of a passenger car, and an evaluation test similar to that of the above-mentioned example was conducted. As a result, evaluation results as shown in Table 2 below were obtained.

[0070]

[Table 2]

From the evaluation results shown in Table 2 above, in contrast to Comparative Examples 1 to 7, only unsatisfactory appearances were obtained, while in Examples 1 to 20, selective polarization was performed on the inner surface of the lamp cover according to the present invention. Since the layers are provided, it can be seen that an excellent appearance design property such as a sense of depth can be obtained without recognizing the uneven structure as an eyesore.

[0072]

As described above, according to the present invention, not only the function as a lamp can be sufficiently exhibited, but also an unprecedented external appearance and design can be achieved, and a feeling of depth when turned off is obtained. It is possible to obtain a vehicular lamp capable of observing a coherent, uniform, and high-quality exterior surface.

Further, according to the present invention, the lamp of the present invention can be completed only by making a simple improvement to the existing lamp, and various external variations can be easily realized if necessary.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing one configuration example of a vehicular lamp of the present invention.

FIG. 2 is an enlarged cross-sectional view showing the vicinity of a lamp cover of the lamp of FIG.

FIG. 3 is a cross-sectional view showing a modified example of the lamp of FIG.

FIG. 4 is a sectional view showing another modification of the lamp of FIG.

FIG. 5 is a schematic diagram showing a pattern of a selective polarizing layer.

FIG. 6 is a cross-sectional view illustrating the use of the lamp of the present invention in a rear combination lamp.

FIG. 7 is a schematic view showing an outer appearance of a lamp cover of the rear combination lamp shown in FIG.

FIG. 8 is a schematic diagram showing emission of light in the structural portion of the rear combination lamp of FIG.

9 is a schematic diagram showing the emission of light in the non-structured portion of the rear combination lamp of FIG.

[Explanation of symbols]

1 ... Base material 2 ... Prism sheet 10 ... Lamp cover 11 ... Selective polarizing layer 11A ... Structure part 11B ... non-structural part 12 ... Adhesive layer 20 ... Vehicle lamp 21 ... Lamp room 22 ... Light source 23 ... Partition 25 ... Aperture for light emission

Claims (16)

[Claims] 1. A vehicle lamp including a lamp chamber in which at least one light source is arranged and having a light emitting opening, wherein the light emitting surface of the lamp is in the light emitting opening of the lamp chamber. A transparent lamp cover having a shape and a size that at least covers the inner surface of the lamp cover, and a non-structural part having no fine concavo-convex structure on the inner surface of the lamp cover. A vehicular lamp, further comprising a selective polarization layer formed in a predetermined pattern. 2. In the selective polarization layer, the structure portion transmits P-polarized light and reflects S-polarized light, and the reflected S-polarized light is transmitted through the structure portion after the polarization is canceled by multiple reflection. The vehicle lamp according to claim 1, wherein the vehicle lamp is transparent. 3. In the selective polarizing layer, the concavo-convex structure of the structural portion is either a linear triangle prism, a prism apex angle of a linear triangle prism, or an angle between adjacent triangles, or both. Is a rounded pseudo-triangular prism, or a prism having a shape corresponding to those obtained by removing a part of the triangular prism or the pseudo-triangular prism, a kamaboko prism, and a pyramid-shaped prism.
The vehicular lamp according to claim 1 or 2, comprising a pyramidal prism, a quadrangular pyramid prism, or a combination thereof. 4. The concave-convex structure of the structure portion, wherein the pitch p of the prisms is 1 mm or less, and the apex angle α of the prisms is 150 ° or less. Vehicle lighting. 5. The selective polarizing layer is formed by partially applying a polarizing film having an uneven structure surface corresponding to the structure portion to an inner surface of the lamp cover. The vehicle lamp according to any one of 1. 6. The selective polarizing layer is formed by applying a polarizing film having a pattern of the structural portion and the non-structural portion on an inner surface of the lamp cover. 2. The vehicle lamp according to item 1. 7. The vehicle lamp according to claim 5, wherein the polarizing film is a brightness enhancement film. 8. The selective polarization layer is formed on the inner surface of the lamp cover by processing the pattern of the structural portion and the non-structural portion.
The vehicle lamp according to any one of 1. 9. In the selective polarizing layer, the penetration rate of the selective polarizing layer (defined by the area ratio of the non-structural portion and the structural portion).
Is in the range of 5 to 90%.
The vehicle lamp according to any one of items 1 to 8. 10. The selective polarization layer, wherein the non-structured portion or the structured portion is formed in a pattern selected from the group consisting of stripes, lattices, dots, or a combination thereof. The vehicle lamp according to any one of 1 to 9. 11. Between the light source and the lamp cover,
The vehicular lamp according to claim 1, further comprising a filter element. 12. The vehicle lamp according to claim 1, wherein the lamp cover is made of a light transmissive resin. 13. The vehicular lamp according to claim 1, wherein the lamp cover is colored. 14. The lamp cover according to claim 1, wherein the lamp cover has a lens function.
The vehicle lamp according to the item. 15. The vehicular lamp according to claim 1, wherein the lamp structure is a divided type lamp structure including at least two lamp chambers in which lamps are arranged. 16. A rear combination lamp for a vehicle, wherein at least two of a stop lamp / tail lamp, a turn signal lamp and a backup lamp are incorporated in an arbitrary pattern and combination. Item 15. The vehicle lamp according to Item 15.