JPH03210701A - Lighting fixture - Google Patents

Abstract

PURPOSE:To obtain a lighting fixture whose visible region is highly transparent and whose ornamental effect is improved by using a film substrate such as a polyether sulfone resin for which the thickness and the average transmissivity of the visible region are specified and forming thereon an optical multilayer film, for a reflector that forms the lighting fixture. CONSTITUTION:A lighting fixture is composed of a halogen lamp 1, a reflector 2, a film substrate 3, and an optical multilayer film 4 provided thereon, while the reflector 2 is bowl-shaped that has a flood opening 5 in its front surface, and is optically opposed to the lamp1. In this structure, the reflector 2 comprises the film substrate 3 that is formed of at least one on plural species of polyether sulfone resin, polyimide resin, and polyesther resin, in the thickness of 50-500mum, and the average transmissivity of its visible region is not less than 80%, while the optical multilayer film 4 that preferentially reflects and transmits the light, is provided on the surface thereof. In this way the transparency of the visible region is improved, and coloring is almost not observed even when seen from the back surface, and the ornamental effect is improved due to the irradiation and reflection.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a spotlight-type lighting fixture that can be used in commercial facilities such as stores.

(Prior Art) Some spotlight-type lighting devices use a reflector in which an optical multilayer film that transmits infrared rays and reflects visible light is formed on a glass substrate. Then, an optical multilayer film that selectively reflects light of the same color or a different color as that of the lamp is formed to obtain light of various colors using a reflector, which has been proposed and put into practical use.

However, using glass as a base material for the reflector has disadvantages such as being heavy and easily damaged, making it difficult to handle, and also requiring mass production due to production costs, making it unsuitable for high-mix, low-volume production. be.

Furthermore, it has recently been proposed to use a heat-resistant resin film as a base material for a reflector.

The heat-resistant resin film used as the base material for this reflector must have infrared transparency, good heat resistance, good adhesion of optical multilayer films, gloss, and moldability. Examples include having good sex.

Examples of materials that satisfy this condition include polyimide, carbon-based resins, and polyetherketone-based resins.A lamp and a reflector made of an infrared-transmitting multilayer film formed on a substrate made of these resins can be used to create a glass lamp. The applicant filed a patent application in 1986 for a lighting device that can achieve the same effect as that of the substrate.
No. 2-76837 (March 30, 1988).

Reflectors based on polyimide resin or polyetherketone resin films satisfy the above conditions, such as having excellent heat resistance. The transparency is poor, and the transmitted light becomes colored light with a yellow or red tinge, making it impossible to obtain the desired colored light, and when the reflector is viewed from the back side, it appears brownish or yellow, which is an inconvenience that lacks decorativeness. Therefore, improvements have been desired, especially in lighting equipment that exposes the reflector.

(Problems to be Solved by the Invention) The present invention provides a reflector using a film-like synthetic resin substrate that has high transparency in the visible range, hardly looks colored even when the reflector is viewed from the back side, and is made of glass. An object of the present invention is to provide a lighting fixture that can have the same level of decorativeness as a reflector formed from a substrate made of aluminum.

[Structure of the Invention (Means for Solving the Problems) The present invention relates to a lamp, and a polyether sulfone resin, polyimide resin, or polyester having a wall thickness of 50 μm to 500 μm and an average transmittance of 80% or more in the visible range. A reflector disposed optically opposite the lamp, including a film-like substrate formed of one or more types of resins, and an optical multilayer film formed on the surface of this substrate to selectively reflect and selectively transmit light. It is characterized by having the following.

(Function) In the lighting equipment of the present invention, the light that enters the reflector from the lamp is selectively reflected and transmitted by the optical multilayer film, is irradiated with a desired light color from the front of the reflector, and is emitted from the back of the reflector. Complementary colors are transmitted from the reflector and illuminate the back side of the reflector, for example, the ceiling surface. Since the reflector includes a substrate with an average transmittance of 80% or more in the visible range, the reflector does not appear colored even when viewed from the back side, and the decorativeness is not impaired.

(Example) Embodiments of the present invention will be described with reference to FIGS. 1 and 2.

1 is a lamp, and this lamp 1 is a low voltage 12V, for example.
A 50W halogen lamp is acceptable. 2 is a reflector, and this reflector 2 is made of polyether sulfone resin, polyimide resin, or polyester resin with a wall thickness of 50 μm to 500 μm and an average transmittance of 80% or more in the visible range (380 to 760 nm). A film-like substrate 3 made of one or more of the following is formed on the surface of this substrate 3 to selectively reflect light.

It includes an optical multilayer film 4 that selectively transmits light. The reflector 2 is formed into a bowl shape with a light projection opening 5 on the front surface, and is arranged to optically face the lamp 1.

In this embodiment, the substrate 3 of the reflector 2 is made of polyetherketone resin, has a wall thickness of 125 μm, and has an average transmittance of about 85% in the visible range and about 85% in the infrared range.

Further, the optical multilayer film 4 includes, for example, a high refractive index layer 4a of titanium oxide (TiO□) and magnesium oxide (MgF2) or silicon oxide (SiO2) as shown in FIG.
It is formed by alternately stacking the low refractive index layers 4b of 2). The thickness and layers of the optical multilayer film 4 may be set so as to selectively reflect and selectively transmit the light from the lamp 1 and irradiate or transmit a desired color of light. The substrate 2 has high transparency and is substantially colorless and transparent due to its material and film thickness.

In order to form the substrate 3 of the reflector 2 into the shape of the reflector, it consists of a lower mold having a molding recess that matches the shape of the reflector 2, and an upper mold having a protrusion opposite to the molding recess of the lower mold. For example, a thickness of 12 mm is formed between the molding recess and the molding protrusion by using a mold.
A 5 μm polyether sulfone resin film is interposed between the lower mold and the upper mold, and the mold is formed by secondary processing.

Next, the operation of this embodiment will be explained. When the lamp 1 is turned on, the light emitted from the lamp 1 is selectively reflected and transmitted by the optical multilayer film 4 of the reflector 2, and the light emitted from the lamp 1 is selectively reflected and transmitted through the optical multilayer film 4 of the reflector 2.
A desired color of light is emitted from the reflector 2, and complementary color or selective color light is emitted from the back of the reflector 2 onto the back of the reflector 2, such as the ceiling surface. The reflector 2 has an average transmittance of 8 in the visible range.
Since the reflector 2 is formed of 0% or more of the substrate 3, the reflector does not appear colored even when the reflector 2 is viewed from the back side, and the decorativeness can be improved by the transmitted light from the substantially colorless transparent portion.

When the substrate 3 of the reflector 2 is formed of the polyether sulfone resin of this embodiment, as shown by A in FIG.
The average transmittance from 760 μm) to about 2 μm in the infrared region is about 85%, and this tendency remains almost unchanged even if the thickness is increased to 500 μm. When comparing the polyimide resin listed as one that satisfies the above-mentioned conditions that a heat-resistant resin film should have with the same thickness as 125 μm in this example, it is found that B in FIG. As shown in , the average infrared transmittance is higher than polyether sulfone resin, but the average transmittance in the visible range is extremely low. This indicates that the substrate has a brownish color and low visible transparency.

However, even with this polyimide resin substrate, it is possible to obtain the same visible transparency as polyether sulfone resin by making the thickness 50 μm to 500 μm and the average transmittance in the visible range 80% or more. was confirmed. Also, in polyester resin, the wall thickness is 50 mm.
It was confirmed that the same visible transparency as polyester sulfon resin can be obtained if the average transmittance in the visible range is 80% or more in the range of μm to 500 μm.

It should be noted that if the thickness of the substrate 3 exceeds 500 μm, the material cost will be high, and although the manufacturing cost will be high, the visible transparency will not be improved, and depending on the material, the visible transparency may be lowered. Further, if the thickness of the substrate 3 is less than 50 μm, it becomes structurally too thin, making it difficult to maintain the shape of the reflector 2, and lacking in practicality as a substrate for the reflector 2.

It has been confirmed that the optimal thickness of the substrate 3 is 125 to 300 μm in terms of visible transparency and manufacturing aspects.

Further, if the average transmittance of the substrate 3 in the visible range is less than 80%, there are disadvantages such as conspicuous coloring such as brownish or yellow and a decrease in visible transparency.

Further, the substrate 2 is desirably made of a non-grade resin in order to maintain shape stability at high temperatures, and is also made of a material with a glass transition point of 200° C. or higher in order to improve heat resistance.

Although the present invention has been described in detail with respect to the above embodiments, the present invention allows various other embodiments. For example, the lamp may be a compact high intensity discharge lamp.

Further, the optical multilayer film may be formed on the back side of the substrate. Further, the film-like substrate may be formed by combining a plurality of resins selected from polyether sulfone resin, polyide resin, and polyester resin.

At that time, the thickness of the substrate is 50 μm to 500 μm,
In addition, it is required that the average transmittance in the visible range is 80% or more.

[Effects of the Invention] As detailed above, the present invention has a reflector having a wall thickness of 50 μm.
A film-like substrate formed of one or more of polyether sulfone resin, polyimide resin, and polyester resin with a diameter of ~500 μm and an average transmittance of 80% or more in the visible range, and an optical device formed on the surface of this substrate. Since it is formed with multilayer films, it has high transparency in the visible range, and even when looking at the reflector from the back side, it hardly looks like it is colored, and it has almost the same level of decorativeness as a reflector made of a glass substrate. It can be made to stand. Moreover, the reflector is thin, and the substrate increases the transmittance of infrared rays. Furthermore, the visible light can be transmitted to the back side of the reflector, so that the back side of the reflector can be irradiated with light onto a ceiling surface, etc., and the decorative effect can be improved together with the reflected light.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention, with Figure 1 being a schematic vertical cross-sectional view of a lighting fixture, Figure 2 being a partially enlarged cross-sectional view of a reflector, and Figure 3 being a spectral transmission of a substrate. It is a characteristic diagram. 1...Lamp. 2...Reflector. 3... Board. 4... Optical multilayer film.

Claims (1)

[Claims] (1) Lamp: A film-like substrate made of one or more of polyether sulfone resin, polyimide resin, and polyester resin, with a wall thickness of 50 μm to 500 μm and an average transmittance of 80% or more in the visible range. and a reflector disposed optically opposite to the lamp, the reflector including an optical multilayer film formed on the surface of the substrate to selectively reflect and selectively transmit light.