JPS59157947A - Bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a light bulb that emits less infrared radiation and has less uneven illuminance.

[Technical background of the invention and its problems]

A halogen light bulb for copying machines consists of a plurality of tungsten filaments connected in series via short-circuit wires and concentrically sealed inside a tubular quartz bulb. This product contains Tendo's infrared rays in its synchrotron radiation, and there is a risk of burning out the manuscript. Therefore, it was considered to cut the infrared light by providing a visible light transmitting infrared reflective film on the outer surface of the bulb. However, in this case, the illuminance of the illuminated surface facing the central portion of the filament is particularly high, and a uniform illuminance distribution cannot be obtained.

In addition, halogen bulbs with aluminum reflectors, which have come to be widely used in store lighting in recent years, produce an optical image of the filament on the irradiated surface, resulting in uneven illuminance distribution. Because it contains , there is a risk of heat damage to products, etc., and it also poses an obstacle to miniaturizing the reflector.

[Aim of the invention]

An object of the present invention is to provide a light bulb that emits less infrared radiation and has a uniform illuminance distribution.

[Summary of the invention]

By providing a visible light transmitting infrared reflecting film on the inner surface of the light diffusing bulb, infrared rays of the light emitted from the filament are blocked, and unevenness in illuminance distribution due to the infrared reflecting film is prevented.

[Embodiments of the invention]

The details of the present invention will be explained with reference to the following examples.

Embodiment 1 In this embodiment, the present invention is applied to a halogen light bulb for a copying machine, and the details thereof are shown in FIG. (1) is a straight tube bulb made of heat-resistant glass such as transparent quartz glass or transparent silicate glass, (2) is a visible light transmitting infrared reflective film formed inward of this bulb (1), +3) , +3) is a sealing part formed by crushing and sealing both ends of the valve (1), +4)
, +4tan, the molybdenum introduced foil embedded in these sealing parts (3), (3), (5), '(5) these introduced ff
3 (J, the inner conductor 1 connected to (4) and extending into the valve (1).+6), (6)... are these inner grooves a
t(5), a short-circuit wire (7) between (5), (a plurality of filaments connected in series via force... and located on the center line of the valve (1)), (81, (8). ... is the anchor that supports the short-circuit wire (force, (7) ..., (91, (9)
are caps attached to both end faces of the valve (1) connected to the introduction foil <4) and (4).

The valve (1) is filled with a necessary halogen along with an inert gas such as argon.

The above-mentioned bulb (1) is made of transparent heat-resistant glass formed into a tube.As shown in the second figure, the inner surface is smooth, and the filaments (6), (6), etc. are positioned carefully on the curved surface, and the outer surface is It is frosted by means such as acid treatment and honing.

As shown in the second diagram, the infrared reflective film (2) is made up of alternating layers of a metal oxide layer (2a) with a low optical refractive index, such as a silica layer, and a metal oxide layer (2b), such as a titania layer, with a high optical refractive index. It is a multi-layered film that reflects infrared rays well and transmits visible light well.

Next, the operation of the light bulb of this embodiment will be explained. When this light bulb is energized, it emits a large amount of infrared rays in both visible light and ζ, and these lights enter the infrared reflecting film (2). (R8)
is reflected by this film (reflected by the 2nd line and returned to the bulb fl), and the part at 9 is the filament +61. Return to +61... and heat it. In addition, 5. Visible light (horse) passes through the infrared reflective film (2) and the bulb (1) almost linearly, is diffused by the frosted surface on the outside of the bulb (1), and is emitted to the outside, illuminating the original etc. .

In this way (-1), the bulb (-1) of this example emits less infrared radiation, so it does not cause heat loss to documents, etc.
The visible light (Be) incident on is a filament (6).

Although the luminous intensity is particularly strong at the portion facing the bulb (6), it is diffused by the frosted surface on the outer surface of the bulb (1) and the luminous intensity is averaged. Therefore, this light bulb provides a uniform illuminance distribution on the document. Furthermore, on the frost surface,
Part of the visible light (R2) is absorbed and heats the bulb (1), but since there is little infrared rays incident on the frosted surface, the bulb (1) will not be overheated.

Furthermore, since the bulb (1) of the light bulb of this embodiment has a smooth inner surface, the ratio of the infrared rays reflected from the infrared reflecting film (2) to the filament (6), , 143)...
・Since it is returned to and heated, it has the additional effect of high Lang efficiency.

Example 2 This example uses a 12 V, 50 W rated reflector-equipped/logen light bulb whose details are shown in FIG. (11) is a T-shaped bulb made of transparent heat-resistant glass (one bottle is made of a multi-layered layer of alternating layers of a metal oxide with a low optical refractive index and a metal oxide with a high optical refractive index, similar to the one described above) formed on the inner surface of this bulb. A visible light transmitting infrared reflecting film made of a multilayer film, α is a sealing part formed by crushing and sealing the base of a bulb (Ll), (14) a sealing part a of a dove.
The molybdenum introduction foil embedded in 3, aQ, (19 is the inner conductor connected to the introduction foil αC (14) and extended into the bulb circle, aQ is the inner conductor wire u'51. (installed between Ls) filament, (R7, an is the introduction foil (14), a terminal connected to the α shaft and led out from the end face of the bulb I, (11 is a light emitting device that covers the sealing part ([bulb Q fixed to 4])) A heat-resistant adhesive is used to fix the reflective mirror to the sealing part (R3).

The bulb aυ has a smooth inner surface as described above, an infrared reflective film (14) is formed on this smooth surface, and the outer surface is frosted as described above.Furthermore, the filament haze is on the center line of the bulb αυ.

The above reflector α barrel is an aluminum quadratic curved reflector, with an aperture diameter of 50 mm and a filamest (1G) focal point.
is located so that the 174 beam angle is 9 to 10 degrees.

When the light bulb of this example is turned on, large infrared rays are emitted from the filament a0 along with visible light, but the infrared rays are emitted by the reflective film (
['4 is reflected into the bulb αυ, and a small proportion of it returns to the filament and heats it;
Helps improve rung efficiency. Further, the visible light that has passed through the infrared reflectors is diffused and emitted by the frosted surface on the outer surface of the bulb (II), reflected by the reflector, and projected forward.

In this embodiment as well, infrared rays are cut by the reflective film α, so there is little infrared rays in the emitted light, and therefore the reflective mirror (t
Even if the l is made small, there is no risk of overheating and heat loss.
Furthermore, there is no risk of heat damage to products etc. due to the projected light.

In addition, since the outer surface of the bulb (1υ) forms a diffused secondary light emitting surface, an optical image of the filament uQ is not formed on the illuminated surface, and therefore the illuminance distribution on the illuminated surface is uniform. , this embodiment also has the advantage that the bulb αυ is not overheated.Moreover, the light diffusion by the frosted surface does not cause the beam light to be excessively diffused, and as described above, the 1/2 beam angle can be set to 9 to 10 degrees. can be kept.

In the above-mentioned embodiment, the outer surface of the bulb was frosted to impart light diffusing properties, but the present invention is not limited to this. A light diffusing film may also be formed on the outer surface of the bulb. It is not essential to return the infrared N reflected from the reflective film to the filament, and in this case, it is not necessary to make the inner surface of the bulb smooth.Furthermore, 1. The present invention can also be applied to ordinary incandescent lamps, and in this case Alternatively, the bulb may be made of a light-diffusing glass such as opalescent glass or crystallized glass to omit the frosting or the light-diffusing film.

Furthermore, in a light bulb with a reflector, the reflector and the light bulb may be made detachable.

[Effects of the Invention] The light bulb of the present invention has a visible light-transmitting infrared reflecting film on the inner surface of the diffuser bulb in which the filament is sealed, so there is little infrared rays in the emitted light, so there is no risk of heat loss to the illuminated object. The advantage is that the illuminance distribution is uniform and the bulb does not overheat.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the light bulb of the present invention, FIG. 2 is an enlarged cross-sectional view of the portion surrounded by chain lines in FIG. 1, and FIG. 3 is a cross-sectional view of the $2 embodiment. (1), Qυ... Bulb (2), 02... Infrared reflective film (6), u6)... Filament (111
...Reflector Agent Patent Attorney Inoue -Male Figure 1'f-34-! 5 Mu 3 γ Ge l, /17 Mu j3〃呵〃 Figure 2 Figure 3

Claims (4)

[Claims] (1) A light bulb characterized in that a visible light-transmissive infrared reflective film is provided on the inner surface of a diffuser bulb in which a filament is sealed. (2) The light bulb according to claim 1, wherein the bulb is made of transparent glass and has a frosted outer surface. (3) The light bulb according to claim 1, wherein the bulb is made of transparent glass and has a light-diffusing film formed on the outer surface of the bulb. (4) The light bulb according to claim 1, wherein the bulb is made of light-diffusing glass.