JP2018174050A - Film for lighting apparatus, film laminate for lighting apparatus, and lighting apparatus - Google Patents

Abstract

Provided are a film for a lighting fixture, a film laminate for a lighting fixture, and a lighting fixture incorporating the same, which can improve at a low cost the disadvantage that the lighting range using a light-emitting diode element is narrow. A film for a lighting fixture is a film for a lighting fixture that is made of an anisotropic light diffusing film and is used by being disposed on a light exit surface side of a light source unit of the lighting fixture. Tilt the light output direction of the laser pointer to the main diffusion direction of light that can be confirmed by irradiating the light of the laser pointer almost perpendicularly to the film, so that the angle of the light entering the film is oblique to the film surface When changed, the projection image of the light emitted from the film appears not only in the extension direction of the incident light direction but also in the diagonal direction with respect to the extension direction, and has a function of splitting the light in at least two directions and outputting the light. [Selection] Figure 1

Description

  The present invention relates to a film for a lighting fixture, a film laminate for a lighting fixture, and a lighting fixture.

  In recent years, from the viewpoint of ecology, LED light bulbs and fluorescent tube shapes that use light-emitting diodes (hereinafter referred to as LEDs) that have low power consumption, vibration resistance, ultra-brightness, and stable light emission for a long period of time as light sources for lighting LED lighting devices such as LED tubes have come to be used. While LED has the above-mentioned advantages, it is a point light source, so it has the characteristic that the directivity of light is high. It is desired.

  In addition, the lighting fixture using the light emitting diode element has a problem that the glare when the lighting fixture is directly viewed, that is, the so-called glare property, is extremely inferior because the light emitting diode has a small light emitting area and the brightness of the light emitting surface is extremely high. Have Therefore, as a method for solving these problems, a method of installing a diffusing member that diffuses light (hereinafter simply referred to as a diffusing member) on a light exit surface of a lighting fixture is widely used. For example, in Comparative Example 2 of Patent Document 1, an example using a diffusion plate having a very high diffusivity having a total light transmittance of 68.5% and a haze of 99.1% is disclosed. However, it is described that when an ordinary diffuser plate that is widely used is used, even if such a diffuser plate having a high diffusivity is used, the 1/2 beam angle is only 104 degrees. That is, when a normal diffusing member is used, even if a diffusing member having a high diffusivity is used, the light distribution of the light emitted from the diffusing member is close to the Lambertian distribution in which the light distribution in the polar coordinate display is circular. It is difficult to achieve a high light distribution angle beyond that. This is because when a normal diffuser plate is used as an optical member, the light intensity is proportional to cos θ, where θ is the angle between the light emitted strongly in the normal direction of the light source and the normal direction. This is because it has a directivity to attenuate.

  Therefore, as a method for solving the above-described problem, a method in which an optical lens is installed on a light emitting surface of a light emitting diode element and the light emitted from the light emitting diode element is spread by the optical lens is widely used. For example, Patent Document 2 discloses a method of installing the optical lens. Further, Patent Document 3 discloses a method that combines a method of installing an optical lens and a method of installing a translucent member having a lens structure on a light exit surface of a lighting fixture.

  Certainly, the light distribution angle of the light emitted from the luminaire can be widened by the methods disclosed in Patent Document 2 and Patent Document 3. However, these methods have a problem that the cost increases because it is necessary to install an optical lens in each light source.

JP 2010-218723 A JP 2012-160666 A Japanese Patent Laid-Open No. 2006-58284

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a lighting device film and a lighting device film laminate that can improve at low cost the disadvantage that the lightening range using a light emitting diode element is narrow. And it is providing the lighting fixture incorporating these.

The film for lighting equipment according to the first aspect of the present invention is
It is composed of an anisotropic light diffusing film, and is a film for a lighting fixture that is used by being disposed on the light exit surface side of a light source unit of a lighting fixture,
The lighting device film has an angle of light incident on the film by tilting the light emitting direction of the laser pointer to the main diffusion direction of light that can be confirmed by irradiating the light of the laser pointer almost perpendicularly to the lighting device film. When the projection is changed so as to be inclined with respect to the film surface, the projected image of the light emitted from the film appears not only in the extension direction of the incident light direction but also in the diagonal direction with respect to the extension direction, and is split in at least two directions. And has the function of emitting light,
It is characterized by that.

Moreover, the film for a lighting fixture is:
The relative light transmittance of light incident at an incident angle of −45 degrees and emitted at a transmission angle of −45 degrees, measured using a variable angle color difference meter, is preferably 0.25 or more.

Moreover, the film for a lighting fixture is:
The relative light transmittance of light incident at −45 degrees and emitted at a transmission angle of −45 degrees is measured by a method using a variable angle color difference meter, and the light emitted at a transmission angle of +45 degrees is The relative light transmittance is preferably 0.7 or more.

Moreover, the film for a lighting fixture is:
It is preferable that a portion having a refractive index different from that of the main constituent component exists in a form extending in the thickness direction of the film for lighting equipment.

  Moreover, it is preferable that the said anisotropic light-diffusion film is a craze film which has the craze extended in the thickness direction of the said anisotropic light-diffusion film inside.

The film laminate for lighting equipment according to the second aspect of the present invention,
The film for lighting equipment according to the first aspect of the present invention and a translucent support having a thickness of 0.1 to 10 mm are combined,
It is characterized by that.

  The lighting device film laminate is inclined in a main diffusion direction of light, which is measured by applying a laser pointer light perpendicularly to the lighting device film laminate, which is measured using a goniochromimeter. The relative light transmittance of light incident at an incident angle of −45 degrees and exiting at a transmission angle of −45 degrees is preferably 0.25 or more.

  The lighting device film laminate is inclined in a main diffusion direction of light, which is measured by applying a laser pointer light perpendicularly to the lighting device film laminate, which is measured using a goniochromimeter. The relative light transmittance of light incident at an incident angle of −45 degrees and emitted at a transmission angle of −45 degrees is 0.7 or more than the relative light transmittance of light emitted at a transmission angle of +45 degrees. Preferably there is.

A lighting fixture according to a third aspect of the present invention is:
A lighting fixture in which the film for a lighting fixture according to the first aspect of the present invention or the film laminate for a lighting fixture according to the second aspect of the present invention is installed on the light-emitting surface side of the light-emitting diode element,
At least a part of the surface of the film for lighting fixture or the film stack for lighting fixture is installed so as to be inclined with respect to the direction of the maximum outgoing light intensity of outgoing light emitted from the light emitting diode element. ,
It is characterized by that.

  Since the film for lighting fixtures according to the present invention can widen the light distribution angle of light emitted from the lighting fixtures, it is brighter than incandescent bulbs and fluorescent lamps, which are problems of lighting fixtures using light-emitting diode elements. The drawback of narrowing can be improved.

It is the schematic of the method of confirming the diffusion direction of the light of the film for lighting fixtures, or the film laminated body for lighting fixtures. It is the schematic of the method of confirming the split effect of the light of the film for lighting fixtures, or the film laminated body for lighting fixtures. It is the photograph of the light source module used for characteristic evaluation, such as illumination intensity and a brightness | luminance as a lighting fixture in an Example. It is the photograph of the lighting fixture model fixture which inclined and installed the lighting device film laminated body in the light source module shown in FIG. 3 used as an example of the performance evaluation of the lighting fixture film laminated body in an Example. It is the photograph of the lighting fixture model instrument which shape | molded and installed the film stack for lighting fixtures in the curved shape in the light source module shown in FIG. 3 used as an example of the performance evaluation of the film laminate for lighting fixtures in an Example. It is a photograph of the situation of the model evaluation method which evaluates the brightness | luminance characteristic of the ceiling surface and wall surface in an Example. It is the graph which showed the comparison of the light distribution of the floor surface illumination intensity of Example 2 and Comparative Example 2. FIG. It is the graph which showed the relationship between -45 degree relative light transmittance in Examples 1-8 and Comparative Examples 4-7, and the floor surface illumination intensity of the light distribution angle of 70 degree | times. It is the graph which showed the relationship between the split effect in Examples 1-8 and Comparative Examples 4-7, and a high light distribution coefficient. It is a graph which shows the luminance light distribution of the wall surface model in Example 3 and Comparative Example 2. It is the graph which showed the relationship of -45 degree relative light transmittance in Examples 1-8 and Comparative Examples 4-7, and the wall surface brightness | luminance of 0 m position which is a wall surface position which touches a ceiling surface. FIGS. 12A and 12B are photographs showing the difference in the brightness of the dark room in Example 3 and Comparative Example 2 when measuring the floor illuminance.

(Lighting film)
The film for lighting fixtures of this invention is comprised from the anisotropic light-diffusion film which light diffuses to one direction, and is arrange | positioned and used for the light-emitting surface side of the light source unit of a lighting fixture.
The lighting device film has an angle of light incident on the film by tilting the light emitting direction of the laser pointer to the main diffusion direction of light that can be confirmed by irradiating the light of the laser pointer almost perpendicularly to the film for the lighting device. When the projection is changed so as to be inclined with respect to the film surface, the projected image of the light emitted from the film appears not only in the extension direction of the light incident direction but also in the diagonal direction with respect to the extension direction. It is important to have a function of splitting light emitted from the film for lighting equipment in at least two directions.
For example, in the case of a general-purpose diffusion member such as a widely used diffusion film or diffusion plate, the light is emitted only in the extension line direction of the incident angle even if the above evaluation is performed, and the split effect is manifested. do not do.

(Method for confirming anisotropy and diffusion direction)
FIG. 1 shows a schematic diagram of a method for confirming anisotropy, which is a requirement for a film for lighting equipment. Place the lighting fixture film vertically on the white wall so that it is almost parallel to the wall, and the laser pointer light from the opposite side of the lighting fixture film wall is almost perpendicular to the surface of the lighting fixture film. Irradiate. The light incident on the film for a lighting fixture is diffused and transmitted, and a projected image 4 of the light appears on the wall surface as shown in FIG. If the width in the major axis direction of the projected image of the light projected on the wall surface is 1.2 or more with respect to the width in the minor axis direction, it is defined as having anisotropy. In the present invention, the major axis direction of the projected image obtained by the above method is defined as the main diffusion direction.

(How to check the split effect)
FIG. 2 shows a schematic diagram of a method for confirming the split property, which is a requirement for a film for lighting equipment.
The incident angle of the laser beam is inclined as shown in FIG. 2 in the main diffusion direction of the projected image confirmed by the method described with reference to FIG. For example, as shown in FIG. 2, when light is incident at an angle θ, not only the projected image 4 of the light emitted in the extension direction but also the projected image 4 ′ of the light emitted diagonally to the extension direction appears. , Defined as split. Note that the difference in brightness between the four projected images 4 and 4 'does not matter.
The higher the brightness of the light spot 4 ', the greater the effect of widening the light distribution angle of the light emitted from the lighting fixture when the lighting fixture film is incorporated into the lighting fixture.
In the present invention, a film for a lighting fixture that exhibits a so-called multi-split effect in which a projected image appears in addition to the two projected images may be used.

(Quantification of split effect of film for lighting equipment and laminated film for lighting equipment)
The film for lighting fixtures of the present invention has a relative light transmittance measured by a method using a goniochromimeter, specifically, tilted in the main diffusion direction of light with respect to the normal direction of the lighting fixture film. When light is incident at an incident angle of −45 degrees, the relative light transmittance of light emitted at a transmission angle of −45 degrees (hereinafter referred to as “−45 degrees relative light transmittance”) is 0.25 or more. It is preferable that
When the -45 degree relative light transmittance is less than 0.25, the split effect is insufficient, and the effect of improving the light distribution is reduced. Further, the -45 degree relative light transmittance is more preferably 0.6 or more. The reason is not clear, but there is a maximum value in the relationship between the -45 degree relative light transmittance and the high light distribution effect as described in detail in the examples. Therefore, 0.6 or more and less than 4 is more preferable.
The details of the above measurement method will be described in detail in Examples. The relative light transmittance measured by this measuring method is a value calibrated using a standard diffusion plate as described later. Therefore, it has a feature that it is a quasi-quantitative value, unlike a measurement value by a widely used goniophotometer. For this reason, it becomes a value corresponding to the amount of light emitted from the film for lighting equipment. On the other hand, in the case of a widely used goniophotometer, the relative value is evaluated under specific measurement conditions, so if the amount of emitted light changes significantly, it is necessary to change the measurement conditions for quantification. I can't.
The above-mentioned -45 degree relative light transmittance is a measure of the above-mentioned split effect of the film for lighting fixtures and the film laminate for lighting fixtures. Therefore, the -45 degree relative light transmittance is preferably as large as possible.

In addition, the film for lighting fixtures has a relative light transmittance of +45 degrees relative light (+45 degrees relative light) that is emitted at a transmission angle of −45 degrees and a transmission angle of +45 degrees when light is incident at an angle of −45 degrees. The ratio of (transmittance) (−45 degrees transmitted relative light transmittance / + 45 degrees relative light transmittance) is preferably 0.7 or more, and more preferably 0.8 or more.
This is because if the ratio is less than 0.7, the split effect is lowered and the effect of increasing the light distribution is lowered. Moreover, although the upper limit of said ratio is not limited, 1.5 or less is preferable from technical difficulty.
The ratio between the −45 degree relative light transmittance and the +45 degree relative light transmittance is measured in accordance with the measurement method of the −45 degree relative light transmittance, and details of the measurement method will be described in detail in Examples.

(How to give a split effect)
As a structure in which the film for lighting equipment exhibits the split effect, for example, there is a form in which fine portions having different refractive indexes from the constituent components of the film are present in a form extending in the thickness direction of the film. In such a configuration, when light incident at an incident angle θi of −x degrees arrives at a fine portion having a different refractive index, the transmitted angle θt that travels through the microstructure is x degrees and the transmitted light is fine. By being divided into reflected and transmitted light that is reflected at the interface of the structure and emits light having a transmission angle θt of −x degrees, a split effect appears. In addition, as long as the film for lighting fixtures can exhibit the split effect, it is not limited to said structure.

(Method for producing film having split effect)
The method for forming the structure is not limited, but is preferably a craze film in which a fine craze extending in the thickness direction of the film is formed inside the film. Examples of the crazing film include those disclosed in Japanese Patent Application Laid-Open No. 07-241917.

  Moreover, the following method is mentioned as an example of the manufacturing method of a craze film. A support having an acute angle is pressed against a transparent or translucent polymer resin film surface held in a tension state, the polymer resin film is bent substantially parallel to the molecular orientation direction, and locally there. A bent portion is formed. Thereafter, the polymer resin film is pulled in a direction perpendicular to the folding line at the bent portion while contacting the tip of the support. Thereby, a continuous striped craze region can be formed substantially parallel to the molecular orientation direction of the polymer resin film.

  The craze area | region here contains both the surface craze which appears on the surface of a polymer resin film, and the internal craze generate | occur | produced in the inside, Comprising: The area | region which has a fine crack-like pattern is said. This craze is composed of molecular bundles (fibrils) and voids, and has a structure similar to that of a sponge as a whole.

(Types of transparent or translucent polymer resin film)
The kind of the transparent or translucent polymer resin film used in the production of the above craze film is not limited as long as the film can exhibit crazing by the above method. For example, a film using a polyolefin resin, a polyester resin, a polystyrene resin, and a polycarbonate resin can be given. Of these resins, a resin having low crystallinity is preferably used.

(Craze film structure)
The transparent or translucent film for producing the craze film of the present invention may have a single layer structure or a multilayer structure. In the multilayer structure, it is possible to control the split effect characteristics etc. of the film for lighting equipment by changing the thickness ratio of each layer and the resin type, etc. In addition, the multilayer structure is intended to expand the variety of control of other characteristics etc. preferable.

(Control method of split effect of craze film)
The method for controlling the split effect of the craze film is not limited. For example, in the craze formation step, it may be controlled by changing the tension or the processing speed, or may be performed by changing the resin type of the film to be craze-formed, the layer constitution ratio of the multilayer structure, or the like. . In particular, since the latter method is effective, it is a preferred embodiment.

(Thickness of film for lighting equipment)
The thickness of the film for lighting equipment is not limited. When unfolding with the above crazed film, it is preferably about 0.03 to 0.5 mm in view of the workability of the crazing process for forming the craze.

(Film laminate for lighting equipment)
Then, the film laminated body for lighting fixtures is demonstrated. The film laminate for a lighting fixture has a structure in which the above-described film for a lighting fixture and a translucent support are laminated. The above-mentioned film for lighting equipment may be soft and inferior in self-support depending on the type of resin constituting the film. When a soft lighting fixture film is incorporated into a lighting fixture, self-supporting is inferior. Therefore, in order to maintain the shape of the lighting fixture film, it is necessary to devise a fixing method such as fixing the lighting fixture film in a tensioned state. become. Therefore, in this invention, it is preferable to use the film laminated body for lighting fixtures which laminated | stacked the film for lighting fixtures on the translucent support body.
The thickness of the support is preferably 0.3 to 10 mm. This is because, if the thickness is less than 0.3 mm, the self-holding property of the film for lighting equipment is lowered, and conversely, if the thickness of the support exceeds 10 mm, the cost increases.

(Characteristics of support)
The characteristics of the support are not limited as long as it is translucent. For example, a transparent plate or a diffusion plate having a total light transmittance of 60% or more can be used.

(Support material)
The material of the support can be appropriately selected as long as it has the above characteristics. For example, plastics, glass, ceramics, etc. are mentioned.

(Manufacturing method of film laminate for lighting equipment)
The manufacturing method of the film laminated body for lighting fixtures is not limited. For example, there can be mentioned a method for producing a film for lighting equipment and a support by sticking them with a translucent adhesive or adhesive.

(lighting equipment)
The lighting fixture of this invention is a lighting fixture in which the said film for lighting fixtures or the film laminated body for lighting fixtures was installed in the light emission surface side of the light emitting diode element. The luminaire is installed such that at least a part of the surface of the luminaire film or the luminaire film laminate is inclined with respect to the direction of the maximum outgoing light intensity of the outgoing light emitted from the light emitting diode element. (Hereinafter, it may be simply referred to as an oblique incident light installation method).
A light-transmitting optical member such as a diffusing member is installed on the light-emitting surface side of the light-emitting diode element to provide functions such as improving the glare when directly viewed by the light-emitting diode element or expanding the brightening range. Things are widely implemented.
On the other hand, as described above, the lighting effect film or the lighting device film laminate used in the lighting device of the present invention has the split effect necessary to exhibit the high light distribution effect, which is the effect of the present invention, as described above. The light installation method is essential. As the oblique incident light installation method, a method using a general-purpose diffusing member is widely practiced. Therefore, the present invention is a novel technique that uses a film for lighting fixtures or a film laminate for lighting fixtures and is combined with an oblique light incident installation method.

(Structure of lighting equipment)
The lighting fixture of the present invention is not limited as long as it satisfies the above requirements, and is installed on the light-emitting surface side of the light source module including at least a light source unit composed of a light-emitting diode element and a housing for housing the light source unit. It is preferable that a light distribution angle control member (hereinafter, also simply referred to as a light distribution angle control member) composed of a film for lighting fixtures or a film laminate for lighting fixtures be a minimum constituent member.

(Light source unit)
In the present invention, the configuration and structure of the light source unit are not limited. For example, a mounting substrate having at least one light emitting diode element mounted on the surface of the substrate can be used. It is not excluded that a heat dissipation measure is taken by laminating a heat dissipating member on the surface of the mounting substrate opposite to the light emitting diode element installation surface or by incorporating a heat dissipating fin.

(Light source module)
The configuration and structure of the light source module in the present invention are not limited, and examples thereof include a structure in which the light source unit is incorporated in the bottom surface or the vicinity of the bottom surface of a housing for a lighting fixture.
Furthermore, it is preferable to improve the light reflectivity of the inner surface of the casing by coating the light exit surface of the mounting substrate of the light source module or the inner surface of the casing with a reflective paint or incorporating a reflecting member. It is. According to this embodiment, the illuminance emitted from the lighting fixture can be increased, and the illuminance directly below can be improved.

(Light-emitting diode element)
Examples of the light emitting diode element in the present embodiment include a light emitting diode element made of a point light emitting element such as an LED light source or a laser light source. The type of the light-emitting diode element is not limited, but an LED light source that is widely spread is preferable.
The kind of LED light source is not limited. For example, a bullet type LED, a surface mount type (SMD), a chip on board (COB) and the like that are widely used can be cited. In particular, the use of surface mount type (SMD) and chip on board (COB) is preferable.

(Installation location and number of light emitting diode elements)
In said embodiment, it is preferable that the said light emitting diode element is installed in the light emission surface of the mounting substrate of a light source unit by one or more. In particular, a type in which a plurality of light emitting diode elements are installed is preferable. The number and arrangement state in the case of installing a plurality of LEDs are not limited.

(Diagonal light installation method)
In the aspect of the oblique light incident installation method according to the present invention, at least a part of the surface of the light distribution angle control member is inclined with respect to the direction of the maximum emitted light intensity of the emitted light emitted from the light emitting diode element. If it is installed in, it will not be limited.
In this embodiment, the direction of the maximum outgoing light intensity of the outgoing light emitted from the light emitting diode element (hereinafter sometimes simply referred to as the outgoing direction) is emitted from the light emitting diode element in the vertical direction. A configuration in which the light distribution angle control member is installed so as to be inclined with respect to the light emission direction, conversely, the light distribution angle control member is installed horizontally, and the light emission surface of the light emitting diode element with respect to the light distribution angle control member The light emitting diode element in which the light emitting diode element is installed so that the light emitting diode element is inclined, and the light emitting lens element is installed on the light emitting surface of the light emitting diode element so that the light emitting direction of the light emitting diode element is inclined Are roughly divided into three forms, in which the light-emitting surface of the light-emitting diode element and the film for lighting equipment or the light distribution angle control member are installed in parallel. Any form may be used in the present invention. Moreover, you may implement with the form which combined these forms.

In the case of the first form, the light distribution angle control member may be curved. The curved installation method is widely used in straight tube lighting fixtures and integrated base lights as a method for installing an optical member using a normal diffusion plate. Since the effect of the present invention can be expressed also by changing the diffusion plate of the product to the light distribution angle control member of the present invention, it is one of the preferred embodiments.
In the embodiment of the present invention, the results of only two forms are shown, but the form of the oblique light incident installation method is not limited to these as long as the above requirements are satisfied.

(Lighting fixture shape)
The light distribution angle control member of the present invention has anisotropic diffusibility and exhibits a split effect in the main light distribution direction. Therefore, it is preferable that the shape of the lighting fixture is also anisotropic. For example, a rectangle or an ellipse is preferable. The direction in which the split effect is produced is not limited, and it may be the minor axis direction or the major axis direction of the lighting fixture. However, since the incident angle can be increased by the oblique incident light installation method, the split is performed in the minor axis direction. It is preferable to install it in such a direction as to produce an effect.

(Positional relationship between light source unit and light distribution angle control member)
The positional relationship between the light source unit and the light distribution angle control member in the present invention is not limited, for example, if the light distribution angle control member is positioned on the light exit surface side of the light source unit. . The distance between the two is preferably 2 mm at the closest position to 200 mm at the farthest distance portion. Increasing the distance can greatly improve the glare when the illuminator is viewed directly in the form of reduced illuminance, so it is preferable to keep it as far apart as possible. Since thickness becomes thick, 200 mm or less is preferable and 100 mm or less is more preferable.
The light distribution angle control member may be installed on the light exit surface of the casing of the light source module, or may be installed inside the casing. Since the effect of improving the high light distribution effect and the glare when the lighting apparatus is directly viewed, that is, the effect of reducing the glare, is increased, it is preferably disposed on the light exit surface.

(Brightness characteristics of lighting equipment)
As the characteristics of the lighting fixture, the illuminance at a light distribution angle of 70 degrees on the floor surface, the luminance at a position 0.02 m away from the lighting fixture on the ceiling surface, and the luminance at the 0 m position, which is the ceiling surface position of the wall surface, respectively. It is preferable to show a brightness higher than the magnification shown in Table 1 with respect to the characteristic value (characteristic value of only the light source module) when no optical member is arranged on the light exit surface.

  Examples of the present invention will be described below, but the present invention is not limited to these examples. The physical property measurement methods for the samples obtained in each Example and Comparative Example are as follows.

(Evaluation method)
(1) Confirmation method of anisotropy and diffusion direction The anisotropy and diffusion direction were confirmed based on the method mentioned above.

(2) Confirmation method of split effect The split effect was confirmed based on the method mentioned above.

(3) Quantitative method of split effect The transmitted light intensity was measured using a variable angle spectrophotometric system GCMS-4 type (manufactured by Murakami Color Research Laboratory Co., Ltd., variable angle spectrophotometer GPS-2 type).
First, the GCMS-4 type transmitted light diffusion standard plate (opal glass) is calibrated, and the transmitted light intensity T of the transmitted light diffusion standard plate at a light receiving angle of 0 degree is used as a reference (1.000). It was. The transmission diffusion standard plate had a transmittance of 0.3535 at a wavelength of 550 nm when the air layer was set to 1.000 by integrating sphere spectroscopic measurement.
Next, the measurement was performed in the r mode of transmission measurement (measurement of the angle dependency of transmitted light intensity when light was incident on the sample at a predetermined incident angle). The measurement conditions were as follows.
Light incident angle: -45 degrees, light receiving angle: -80 degrees to 80 degrees, 5 degree pitch (polar angle azimuth from film normal is horizontal), light source: D65, field of view: 2 degrees Fixed to the sample stage so that the main light diffusing direction of the lighting fixture film or lighting fixture film laminate is horizontal (the deviation between the axis of the sample stand and the axis of the main light diffusing direction is allowed up to about 20 degrees) The main diffusion direction was determined by the above method), and the transmitted light intensity at each light receiving angle was measured. The tilt angle was 0 degree. In the case of the film laminated body for lighting fixtures, it measured by entering light from the same side as the light-incidence surface at the time of incorporating in a lighting fixture. In the present Example, it evaluated by the method of entering light from the film side for lighting fixtures.
The -45 degree relative light transmittance and +45 degree relative light transmittance measured by the above method were determined. Both the −45 degree relative light transmittance and the +45 degree relative light transmittance are indicated by values at a wavelength of 550 nm. The reason why the wavelength 550 nm is displayed is that the value of the wavelength 550 nm is highly correlated with the luminous intensity.
The split effect was expressed as a value of −45 degrees relative light transmittance / + 45 degrees relative light transmittance. The larger the value, the greater the split effect.

(4) Characteristic evaluation of lighting fixture (4-1) Light source module Koizumi Lighting Co., Ltd. LED line illumination (AL37225L) The diffuser plate incorporated in the light emission surface was removed and used. A photograph of the light source module is shown in FIG.

(4-2) Model lighting fixture for performance evaluation of light distribution angle control member (4-2-1) Inclined installation method As shown in the photograph of FIG. 4, a light distribution angle control member is provided on the light output surface of the light source module. Evaluation was performed by installing the light source module at an inclination angle of 45 degrees on both sides from the center position in the minor axis direction. The light distribution angle control member was evaluated by fixing two flat plates with a transparent tape and fixing them with a transparent tape on the light emitting surface of the light source module so that the cross section becomes a regular triangle as shown in the photograph. The light distribution angle control member was evaluated by sticking a film for a lighting fixture with water on one side of various supports. The attachment to the light source module was performed so that the film for lighting equipment was on the light incident surface side. Moreover, the film for lighting fixtures was stuck so that the main spreading | diffusion direction might become a transversal direction.
In this evaluation, since the sample length of the light distribution film was 190 mm, the light distribution angle control member was shielded with black shading paper at both ends with ± 95 mm as the opening from the center of the light source module. The light distribution angle control member was installed in the part and evaluated.

(4-2-2) Curved Installation Method According to the above-described inclined installation method, except that the light distribution angle control member is changed to a molded body having a curved shape on the light output side as shown in the photograph of FIG. The evaluation was performed in the same manner as the inclined installation method. The distance between the top surface of the light distribution angle control member and the light exit surface of the light source module was 45 mm. The film for lighting fixtures was evaluated by sticking to the inner surface side with water in the same manner as the inclined installation method.

(4-3) Floor surface illuminance measurement Using a variable angle illuminometer ("ZERO-ONE" manufactured by Highland), the illuminator is placed on the drive-type sample table, the center point of the light source module and the sample table The center point of the light source module is set so that the distance between the light emitting surface and the light receiving surface of the illuminating device is 1000 mm, and the angle-of-change range is -90 degrees to +90 degrees with a 5 degree pitch condition. The light distribution of illuminance in the direction was measured.
The illuminance was measured in a dark room, and the measurement was started 30 minutes after the lighting device was turned on. The evaluation results were displayed at 70 degrees illuminance and 0 degrees illuminance. The 70 degree illuminance was displayed as an average value of −70 degree illuminance and +70 degree illuminance. The higher the illuminance at 70 degrees, the greater the light distribution effect.
Further, the ratio of the 70 ° illuminance to the 0 ° illuminance (70 ° illuminance / 0 ° illuminance) was determined and used as a high light distribution coefficient.
The higher the 70 degree illuminance and the higher the light distribution coefficient, the greater the light distribution effect.

(4-4) Ceiling surface luminance and wall surface luminance The illuminance on the ceiling surface cannot be measured. Therefore, the brightness was evaluated. In this evaluation, evaluation was performed by a method that can also measure the luminance of the wall surface. Evaluation was performed by the model evaluation method shown in the photograph of FIG.
In other words, a table desk is set up vertically at the entrance and exit of the dark room, and Epson PX matte paper (white reflective paper with high diffuse reflectance) is pasted on the board on the floor surface of the dark room and the table desk set up vertically. Install a white reflective board, place the light source module at the end of the dark room of the white reflective board on the floor, make the major axis direction of the light source module parallel to the wall surface, and the light exit surface to the ceiling surface of the dark room The light source module is turned on, and the luminance of the floor surface and the white reflective board surface perpendicular to the floor surface is measured using a two-dimensional luminance meter (ACE-100) manufactured by Highland Corporation. And the brightness | luminance of the white reflective board surface whole surface of a perpendicular | vertical surface was measured, and it analyzed by the measured value which carried out the line analysis of the brightness | luminance of the center part of this white reflective board. The model surface of the wall surface was found to have a case where the brightness at the upper position greatly changed from the end surface of the desk. Therefore, the white reflection board was extended to the ceiling surface of the dark room and evaluated.
The white reflective board on the floor surface of the dark room is on the ceiling surface, and the white reflective board installed perpendicular to the white reflective board on the floor surface corresponds to the brightness of the wall surface. The distance from the light source on the ceiling surface to the wall surface was 2 m. The height of the wall model was 4.24 m.
The brightness of the ceiling model surface was displayed as values at positions 0.02 m, 1 m, and 2 m away from the light source module. Naturally, the 2m position is the position of the contact point with the wall surface model surface.
The brightness of the wall model surface was displayed as values of 0 m, 1 m, 2 m, and 4 m from the ceiling surface position.

(Manufacturing method of film A for lighting equipment)
(5) Film formation Using three melt extruders, in the first extruder, 100 parts by weight of a homopolypropylene resin (MA3U melt flow rate: 15 (230 ° C.) manufactured by Nippon Polypro Co., Ltd.) is a surface layer. In a second extruder, a copolymer polypropylene resin obtained by copolymerizing 20 parts by weight of homopolypropylene resin (MA3U melt flow rate: 15 (230 ° C.) manufactured by Nippon Polypro Co., Ltd.) with ethylene and butene. (Sumitomo Chemical Co., Ltd. WF345S Melt flow rate: 10 (230 ° C.)) Extruded 80 parts by weight to be an intermediate layer, and further copolymerized polypropylene resin obtained by copolymerizing ethylene with a third extruder (Japan) Polytech Co., Ltd. WINTEC WFX4 Melt flow rate: 10 (230 ° C)) 100 weight The first extruder after melt-extruding so that the surface becomes the surface layer opposite to the layer extruded from the first extruder and laminating to form a three-layer three-layer structure in the T-die A film having a total thickness of 40 μm was obtained in such a manner that the further extruded layer was wound around the cooling roll. The layer thickness constitution was 12/25/3 (μm) from the layer side extruded from the first extruder.

(6) Formation of craze The film obtained as described above was subjected to craze processing from the layer side extruded from the first extruder as follows. A crazing device including an auxiliary tool that moves up and down by a spring and a screw to adjust the tension of the polymer resin film and a support having an acute-angle tip is used. First, the tip of the support is pressed against the film surface held in tension and bent, and a constant tension is applied to the polymer resin film by an auxiliary tool, and the polymer resin film is brought into contact with the support. Pull while letting. Thereby, the film A for lighting fixtures which has a continuous craze area | region substantially parallel to the molecular orientation direction of a polymer resin film was obtained.
-45 degree relative light transmittance, +45 degree relative light transmittance and split effect (-45 degree relative light transmittance / + 45 degree relative light transmittance) of the obtained film A for lighting equipment were 7.80, It was 7.22 and 1.08.

(Support)
Table 2 shows the types and characteristics of the supports used in the examples and comparative examples.

  In addition, the relative light transmittance and light distribution angle of the acrylic diffusion plate installed in the lighting fixture were 0.8 and 130 degrees, respectively, which were the same characteristics as the support E.

(Example 1 to Example 8)
Using the lighting fixture model fixture (FIG. 4) in which the lighting fixture film laminate is installed on the light source module shown in FIG. Table 3 shows the results.
As the bottom surface illuminance characteristics, the illuminance with a light distribution angle of 70 degrees, which is a measure of the high light distribution effect, the 0 degree illuminance corresponding to the illuminance directly below, the high light distribution coefficient which is a measure of illuminance uniformity, and the degree of the high light distribution effect 70 degree illuminance ratio, which is a relative value based on each illuminance when the acrylic diffusion plate incorporated in the illuminator that is a specification of the illuminator using the light source module and the illuminator specification using the light source module is also described did.
The lighting device film laminate was evaluated by incorporating the lighting device film and the support with water and incorporating the lighting device film into the light source module so that the lighting device film was on the light incident surface side.
The floor surface illuminance and the high light distribution coefficient at a light distribution angle of 70 degrees are greatly improved, and the range in which the floor surface is brightened is widened. Moreover, the uniformity of the brightness of the floor surface is improved. There may be a brightness exceeding 10 times the illuminance of the light source module.
However, the illuminance immediately below is lower than that of the light source module alone (Comparative Example 1) or a product using the light source module (Comparative Example 2). However, as will be described later, in these examples, the brightness of the ceiling surface and the wall surface is significantly improved as compared with Comparative Example 1 and Comparative Example 2. Since human eyes are directed to the ceiling and walls, it is said that if the ceiling and walls are bright, the same brightness will be felt even if the brightness of the floor is halved. Is acceptable. Rather, it is more advantageous that the brightness of the whole room becomes brighter.

(Comparative Example 1 and Comparative Example 2)
Table 3 shows the results of illuminance on the floor surface of a lighting fixture using the light source module in which only the light source module is used and the light source module in which an acrylic diffusion plate is incorporated on the light exit surface of the light source module. The illuminance directly below (0 degree illuminance) is higher than those in Examples 1 to 8, but the illuminance is 70 degrees and the brightness spread on the floor surface is narrow.

(Comparison of light distribution of floor illuminance between Example 3 and Comparative Example 2)
FIG. 7 shows a comparison of light distribution of floor illuminance between Example 2 and Comparative Example 2. While Comparative Example 2 has a substantially Lambertian light distribution, Example 2 has a substantially uniform brightness from -90 degrees to 90 degrees, indicating that the effect of the present invention is remarkable.

(Comparative Example 3)
Table 3 shows the results when the laminate of the lighting fixture film and the support C is horizontally installed on the light exit surface of the light source module. The effect of increasing the light distribution expressed in Example 3 is not achieved. It shows that the above-described split effect does not occur when the amount of light incident obliquely with respect to the light distribution angle control member decreases.

(Comparative Example 4 to Comparative Example 7)
Table 3 shows the results of the luminaire model apparatus in which only the support is inclined. Illuminance with a light distribution angle of 70 degrees and high light distribution effect are small. In order to obtain the effect of the present invention, it is shown that lamination of a film for a lighting fixture is essential.

(Relationship between -45 degree relative light transmittance and floor surface illumination with light distribution angle of 70 degree)
FIG. 8 shows the relationship between the −45 degree relative light transmittance and the floor illuminance at a light distribution angle of 70 degrees in Examples 1 to 8 and Comparative Examples 4 to 7. Only in the examples, the effect of increasing the light distribution, which is the effect of the present invention, is expressed, and it is shown that the effect of the present invention is critical. Moreover, it has shown that the high light distribution effect becomes higher by satisfy | filling the more preferable range mentioned above. Note that the cause of the maximum value in the above relationship is not clear.

(Relationship between split effect and high light distribution coefficient)
FIG. 9 shows the relationship between the split effect and the high light distribution coefficient in Examples 1 to 8 and Comparative Examples 4 to 7. FIG. 9 also shows that the effect of increasing the light distribution, which is the effect of the present invention, is manifested only in the embodiment, and the effect of the present invention is critical.
It also shows that the effect of the present invention is caused by the split effect of the light distribution angle control member.

(Ceiling brightness)
Table 4 shows the luminance evaluation results of the ceiling surface models in Examples 1 to 8 and Comparative Examples 1 to 7.

As the luminance characteristics, the brightness in the vicinity of the lighting fixture (distance to the lighting fixture: 0.02 m) and the distance to the lighting fixture: 2 m, that is, the brightness of the wall surface position are displayed. Moreover, the result of the maintenance factor of the brightness | luminance of 2 m with respect to the brightness | luminance of a 0.2-m position was shown.
Similar to the floor illuminance, the results of the examples are significantly different from those of Comparative Examples 1 to 3, but with Comparative Examples 4 to 7 in which the film for lighting equipment is not laminated in the inclined installation method. The difference was small. That is, regarding the ceiling surface luminance, it can be said that the contribution of the effect that light enters the optical member obliquely is large, and the contribution of the split effect of the film for lighting equipment is small.
However, the maintenance rate of the luminance corresponding to the attenuation rate due to the distance of the brightness is improved by the lamination of the lighting fixture film. Since the high maintenance factor means that the influence of the brightness of the ceiling surface is small, it can be said that the film lamination for lighting fixtures exhibits a favorable effect.

(Wall brightness distribution)
FIG. 10 shows the evaluation results of Example 3 and Comparative Example 2 as a representative example of the luminance distribution of the wall surface model measured by the method described above. The vertical axis in FIG. 10 indicates the brightness of the wall surface model, that is, the degree of brightness of the wall surface. On the other hand, the horizontal axis indicates the distance from the ceiling model.
The light distribution of the wall luminance is greatly different between Example 3 and Comparative Example 2. In Comparative Example 2, the brightness at a position about 2.5 m away from the ceiling surface is the brightest, and the brightness at the 0 m position in contact with the ceiling surface is dark. On the other hand, in the case of Example 2, the ideal brightness distribution in which the brightness near the ceiling surface is brightest and the brightness gradually decreases as the distance from the ceiling surface increases, and the effect of the present invention is remarkable. Is shown.

(Brightness characteristics of wall surface)
Table 5 shows the luminance evaluation results of the wall surface models in Examples 1 to 8 and Comparative Examples 1 to 7.
As the luminance characteristics, the luminances at distances of 0 m, 1 m, 2 m, and 4 m from the ceiling surface are described. These luminance values were obtained from the measurement result of the luminance distribution of the wall model whose typical example is shown in FIG.
Moreover, the relative value with respect to the comparative example 1 which is the brightness | luminance of the light source module of 0 m position was described. The relative value is a measure of the degree of the effect of the present invention. It can be said that the larger this value is, the greater the light distribution effect, which is the effect of the present invention.
Similar to the floor surface illuminance, the brightness in the vicinity of the ceiling surface is 12 times or more that of Comparative Example 1, and it can be seen that the effect of the present invention is extremely remarkable.

As the luminance characteristics, the luminances at distances of 0 m, 1 m, 2 m, and 4 m from the ceiling surface are described. Moreover, the relative value with respect to the comparative example 1 which is the brightness | luminance of the light source module of 0 m position was described. The relative value is a measure of the degree of the effect of the present invention.
When the light source module or the optical member is installed horizontally on the light exit surface, the brightness at the position about 2.5 m away from the ceiling surface is the brightest, and the brightness at the 0 m position in contact with the ceiling surface is dark. On the other hand, in the case of the embodiment, an ideal brightness distribution in which the vicinity of the ceiling surface is brightest and the brightness gradually decreases as the distance from the ceiling surface increases. In addition, as in the case of the floor surface illuminance, the brightness in the vicinity of the ceiling surface may be 10 times or more that of the light source module, and it can be seen that the effect of the present invention is extremely remarkable.

(Relationship between -45 degree relative light transmittance and wall brightness)
FIG. 11 shows the relationship between the −45 degree relative light transmittance and the wall surface luminance at the 0 m position that is the wall surface position in contact with the ceiling surface in Examples 1 to 8 and Comparative Examples 4 to 7.
Only in the examples, the effect of increasing the light distribution, which is the effect of the present invention, is expressed, and it is shown that the effect of the present invention is critical.
Moreover, it has shown that the high light distribution effect becomes higher by satisfy | filling the more preferable range mentioned above.
In addition, the cause of the maximum value in the above relation is not clear.

(Dark room brightness)
FIGS. 12A and 12B show photographs showing the difference in brightness of the dark room in the case of Example 3 and Comparative Example 2 when measuring the floor illuminance.
The luminaire is installed in the lower left part of each photo so that the light exit surface is on the upper side. Therefore, the ceiling surface of the dark room corresponds to the floor surface.
In the case of Example 1, the entire dark room has almost uniform brightness, whereas in the case of Comparative Example 2, only the floor surface is bright, and it is clear that the effect of the present invention is extremely large. .

(Example 9 and Example 10)
Table 6 shows the results of evaluation by installing the film laminate for a lighting fixture on the light source module shown in FIG. 3 in a curved shape so that the light exit surface side is convex as shown in the photograph of FIG. The film A for lighting fixtures was stuck with water on the inner surface of the film laminate for lighting fixtures and evaluated.
Compared to Example 2 and Example 3, the effect of the present invention can be realized although the effect of increasing the light distribution is slightly lower.

(Lighting device film B and Lighting device film C)
Using a cyclic polyolefin resin and a copolymerized polyester resin, a lighting device film B and a lighting device film C were manufactured according to the manufacturing method of the lighting device film A, respectively. Table 7 shows the characteristics of the obtained film for lighting equipment.

(Example 11 and Example 12)
The floor surface illuminance, the ceiling surface model luminance, and the wall surface model luminance were evaluated in the same manner as in Example 3 using the lighting device film B or a laminate of the lighting device film C and the support C, respectively. In both cases, an effect of increasing light distribution equivalent to that in Example 3 was obtained.

  The lighting device film or the lighting device film laminate of the present invention has a direction of an extended line of the incident angle when light is obliquely incident on the lighting device film or the lighting device film laminate. In addition to the light emitted from the light source, it has a unique characteristic that light incident in a direction substantially diagonal to the extension line direction is emitted in a split form, so that it is on the light exit surface side of a lighting fixture using a light emitting diode element. When a conventionally known light diffusing member is used for the light distribution angle of light emitted from the lighting fixture by incorporating the lighting fixture film or the lighting fixture film laminate in such a form that the above-mentioned split effect can be exhibited. As a result, the lightening range is narrower compared to incandescent bulbs and fluorescent lamps, which is a problem with lighting equipment using light-emitting diode elements. That. Therefore, it can be used widely and suitably as a lighting device for a wide range of uses such as residential use, facility use and outdoor use.

Claims (9)

It is composed of an anisotropic light diffusing film, and is a film for a lighting fixture that is used by being disposed on the light exit surface side of a light source unit of a lighting fixture,
The lighting device film has an angle of light incident on the film by tilting the light emitting direction of the laser pointer to the main diffusion direction of light that can be confirmed by irradiating the light of the laser pointer almost perpendicularly to the lighting device film. When the projection is changed so as to be inclined with respect to the film surface, the projected image of the light emitted from the film appears not only in the extension direction of the incident light direction but also in the diagonal direction with respect to the extension direction, and is split in at least two directions. And has the function of emitting light,
A film for lighting equipment characterized by the above. The film for lighting equipment is:
The relative light transmittance of light incident at an incident angle of −45 degrees and emitted at a transmission angle of −45 degrees, measured using a variable angle color difference meter, is 0.25 or more.
The film for lighting equipment according to claim 1. The film for lighting equipment is:
The relative light transmittance of light incident at −45 degrees and emitted at a transmission angle of −45 degrees is measured by a method using a variable angle color difference meter, and the light emitted at a transmission angle of +45 degrees is 0.7 or more relative light transmittance,
The film for lighting equipment according to claim 1 or 2, wherein The film for lighting equipment is:
A portion having a refractive index different from that of the main constituent component exists in a form extending in the thickness direction of the film for lighting equipment,
The film for lighting fixtures as described in any one of Claims 1-3 characterized by the above-mentioned. The anisotropic light diffusion film is a craze film having a craze extending in the thickness direction of the anisotropic light diffusion film inside.
The film for lighting equipment according to claim 4, wherein The film for lighting equipment according to any one of claims 1 to 5 and a translucent support having a thickness of 0.1 to 10 mm are combined.
The film laminated body for lighting fixtures characterized by the above-mentioned. Inclined in the main diffusion direction of light that can be confirmed by applying light from a laser pointer perpendicularly to the film laminate for lighting equipment, measured using a variable angle color difference meter, and incident at an incident angle of −45 degrees, The relative light transmittance of light emitted at a transmission angle of −45 degrees is 0.25 or more,
The film laminated body for lighting fixtures of Claim 6 characterized by the above-mentioned. Inclined in the main diffusion direction of light that can be confirmed by applying light from a laser pointer perpendicularly to the film laminate for lighting equipment, measured using a variable angle color difference meter, and incident at an incident angle of −45 degrees, The relative light transmittance of light emitted at a transmission angle of −45 degrees is 0.7 or more relative to the relative light transmittance of light emitted at a transmission angle of +45 degrees.
The film laminated body for lighting fixtures of Claim 6 or 7 characterized by the above-mentioned. The lighting device film according to any one of claims 1 to 5 or the lighting device film laminate according to any one of claims 6 to 8 installed on a light-emitting surface side of the light emitting diode element. An instrument,
At least a part of the surface of the film for lighting fixture or the film stack for lighting fixture is installed so as to be inclined with respect to the direction of the maximum outgoing light intensity of outgoing light emitted from the light emitting diode element. ,
A lighting apparatus characterized by that.