JP2502323B2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Purpose of the invention [Industrial field of application] The present invention relates to a lighting device used as a document illuminating unit in office equipment such as a copying machine and a facsimile.
In particular, the present invention relates to a lighting device using a multi-point light emitting tubular lamp (hereinafter referred to as a lamp) as a light source.

[Conventional technology]

The following points are points to be considered when designing the above lighting device.

(1) If the size of the lighting device is particularly large in the height direction, the entire main device becomes large.

(2) Highly efficient lighting is possible. If the lighting efficiency is low, it is necessary to increase the power consumption of the lamp itself in order to obtain the required amount of light, which increases the capacity of the lamp power supply, resulting in high cost. In addition, the amount of heat generated increases, which necessitates a cooling fan, which also leads to an increase in the size of the entire main body device and an increase in cost.

(3) An illumination light amount distribution that is as uniform as possible over the entire required illumination area is obtained. If there is unevenness in the illumination light intensity distribution,
When the main body device is, for example, a copying machine, unevenness in image density corresponding to unevenness in the distribution of the amount of illumination light occurs in the copied image, resulting in deterioration of image quality.

FIG. 14 is a perspective view showing a conventional illuminating device. In the figure, 1 is a lamp, which is composed of an elongated glass straight tube 2 and a filament 10 inserted into the tube. filament
10 has a plurality of filament winding portions 11 to 15 as light emitting points along its length at substantially regular intervals, and each of the light emitting points 11 to 15 emits light when energized, and a linear light source lamp as a whole. Function as.

Reference numeral 3 is a reflecting mirror shade for converging the light flux emitted from the filament 10 between the slit illuminating portions 41-42 of the document surface 4 as an illuminated member, and its cross-sectional shape is a filament.
It is an inertial mirror whose focal point is between 10 and the slit illumination unit 41-42.

FIG. 15 is a view of FIG. 14 viewed from the direction α, in which 11 ′ to 15 ′ are virtual images of the light emitting points 11 to 15 of the filament 10 reflected on the reflecting mirror shade 3.

In the illumination device having the above-described configuration, in order to reduce unevenness in document illumination, the surface of the glass tube 2 is subjected to a diffusion treatment (hereinafter, referred to as frost treatment) to diffuse the light flux from each of the light emitting points 11 to 15 and the slit. The unevenness of the amount of light between the illumination units 41-42 is reduced.

Further, the light emission points 11 and 15 at both ends of the lamp 1 need to have a larger light emission amount than the light emission points 12 to 14 at the central part so as not to reduce the light amount on the original surface corresponding to both ends of the lamp. There is. That is, at both ends of the document surface 4, the illumination luminous flux is on only one side, that is, on the 41 side of the document surface 4, mainly the light emission point 11 is emitted.
On the 12 and 42 side, mainly the luminous fluxes of only the light emitting points 14 and 15 are received, so the light quantity becomes insufficient. In order to compensate for this lack of light intensity, the light emission amounts E1 and E5 at the light emission points 11 and 15 at both ends of the lamp are
As shown in Fig. 16, the emission points 12 to 14 other than the both ends of the lamp
Light emission amount E2 to E4 of.

[Problems to be solved by the invention]

Since the conventional lighting device is configured as described above,
In order to increase the illumination efficiency, the distance L between the lamp 1 and the document surface 4 may be shortened, but if the distance L is too short,
Even if the frost processing is performed, the portion F corresponding to the light emitting points 11 to 15 of the lamp 1 becomes too bright, the portion 1 between the light emitting points becomes dark, and uneven light amount occurs.

Therefore, if it is attempted to increase the number of light emitting points to reduce the unevenness of light amount, the light emitting amount and heat generation amount per one light emitting point are reduced, the efficiency of the halogen cycle is lowered, the lamp is blackened, and the vibration or the like is generated. Therefore, there is a problem that the filament is easily broken.

The present invention has been made to solve the above problems, and is compact and has excellent illumination efficiency without causing unevenness in the illuminance distribution due to the light emitting point of the lamp and unevenness in the illuminance distribution due to insufficient light quantity at both ends of the lamp. The purpose is to provide a device.

B. Configuration of the Invention [Means for Solving the Problems] The lighting device of the present invention includes a multi-point light emitting tubular lamp, and surrounds other than both ends of the lamp to regulate light that directly travels from the lamp to the illuminated portion. The first reflection shade, the second reflection shade that receives the light from the lamp and the first reflection shade and reflects toward the illuminated portion, and surrounds both ends of the lamp, and directs the light from the lamp toward the illuminated portion. It has a pair of 3rd reflective shades which reflect and are reflected.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. First
2 shows the first embodiment, FIG. 1 is a perspective view, and FIG. 2 is a side view. In Fig. 1 and 2, the above 14
The same parts as those in FIG. 15 are designated by the same reference numerals, and 31 to 34 are lamps 1
It is a reflecting mirror shade that focuses the light flux from the space between the slit illumination parts 41-42.

The reflector shade 32 constitutes a first illumination system together with the reflector shade 34, and illuminates the document surface 4 reflected on the plane mirror of the reflector shade 34, but the lamp 1 and the slit illuminator 41-42. The virtual image part 4
It is an inertial mirror whose focal point is 1'-42 '.

The reflecting mirror shades 31 and 33 form a second illumination system, and are inertial mirrors having the lamp 1 and the slit illumination units 41 to 42 as their focal points.
Since the major axis of the reflecting mirror shades 31 and 33 is shorter than that of the reflecting shade 32 (because the lamp and the document surface 4 are close to each other), the reflecting shade 32.
Higher lighting efficiency than 34 combinations.

Therefore, when the reflecting mirror shades 31 and 33 illuminate the original surface using the light emitting points 11 and 15 at both ends of the lamp 1, the light emitting points
・ 15 light emission can be reduced. This means that if the lamps have the same power consumption, the light emitting points 11 and 15 at both ends of the lamp will
Light emission points 12 to 14 other than at both ends
It is possible to increase the light emission amount of.

FIG. 3 is a view showing the original illumination light amount distribution according to the first embodiment. In the drawing, the light amount distributions E6 to E10 are the light emitting points 11.
It shows the lighting conditions of ~ 15.

Next, the difference in effect between the conventional illuminating device shown in FIGS. 14 and 15 and the first embodiment of the present invention shown in FIGS. 1 and 2 will be specifically described.

Now, in order to illuminate the document surface 4 with the required light intensity, 1000
Suppose you needed a W lamp. Then, assuming that this lamp has five light emitting points and the light emitting points at both ends are 1.4 times as long as the light emitting points other than the both ends, the total light emitting point length (sum of five light emitting points) is calculated. When the length is 50 mm, the length of each of the light emitting points other than both ends is 50 / {(1.4 × 2) + (1 ×
3)} = about 8.62 mm, and the length of the light emitting points at both ends is 8.62.
X1.4 = 12.1mm. That is, in the conventional lighting device, it is necessary to use a lamp in which the length of the light emitting points at both ends is 12.1 mm and the length of the light emitting points other than both ends is 8.62 mm.

On the other hand, in the illuminating device of the present invention, since the effect of illuminating both ends of the original is high, the total light emitting point length of the lamp used may be shorter than the total light emitting point length of the lamp used in the conventional device.

In other words, the distance between the lamp 1 and the slit illuminators 41-42 is the same as the second illuminating system consisting of the reflecting mirror shades 31 and 33.
・ Compared to the first illumination system by 34, it is about 1/2. Therefore, considering that the amount of light changes with the square of the ratio of the distance between the point light source and the light receiving unit, the total light emitting point length of the lamp used is compared with the total light emitting point length of the lamp used in the conventional device.
1/4 is sufficient, and the length of the light emitting points on both ends of the lamp is 12.1 m
m / 4 ≈ 3.0 mm. Therefore, in the case of a lamp with a total light emitting point length of 50 mm, the light emitting point length of (12.1-3.0) × 2 = 18.2 mm is added to the light emitting points other than both ends to increase the light emission amount of the light emitting points other than the both ends. be able to.

On the other hand, since the first illumination system is via the reflecting mirror shade 34, a loss of about -20% is usually generated. To make up for this loss,
The length of the light emitting points other than both ends is increased, and the length of one light emitting point is 8.62 / 0.8 = 10.775mm, and the total light emitting point length is (10.775) × 3 + 3.0 × 2 = 38.325. mm.

This means that when a lamp with a total emission point length of 50 mm and a power of 1000 W is used in the device of the present invention, the lamp power consumption is (38.325 / 5
0) × 1000 = 766.5W, which is equivalent to an improvement in lighting effect of about 30% compared to the case where the lamp under the above conditions is used in the conventional device.

The reflecting mirror shades 31 to 33 constituting the illumination system in the first embodiment shown in FIGS. 1 and 2 all have cross-sections formed by coasting curved surfaces, but as shown in FIG. An illumination system using a combination of similar plane mirrors also has the same effect as that of the first embodiment. As described above, the combination of the plane mirrors has an effect of increasing the tolerance of the lamp mounting as a manufacturing problem.

As described above, the amount of light emitted from the lamp 1 is greatly affected by the length of the light emitting point. Therefore, it is necessary to adjust the amount of light due to manufacturing variations in the length of the light emitting points at both ends.

FIG. 5 shows an example of adjusting the amount of light at the light emitting points on both ends. In the figure, 50 is an adjusting screw, 51 is a support plate of an illumination system body (not shown) with tapping, and the adjusting screw 50 is screwed. I am doing it.

Turn the adjusting screw 50 to move it forward, and
The tip of 50 pushes the upper part of the back surface of the reflector 31 and bends it as shown by the chain double-dashed line. Therefore, the luminous flux 61 emitted from the light emitting point 11 of the lamp 1 and reflected by the upper portion of the reflecting mirror shade 31 to illuminate between the slit illuminating sections 41 and 42 becomes a luminous flux 62, and becomes a slit illuminating section. It deviates from 41-42. That is, the light quantity of the slit illumination unit decreases. However, reflecting mirror shade 32/34
Does not change the first illumination system, and the illumination light flux does not change.

FIGS. 6 and 7 show a fourth embodiment of the present invention.
FIG. 6 is a perspective view and FIG. 7 is a side view thereof. In this embodiment, the upper portions of both ends of the reflecting mirror shade 32 are cut out to form windows 36 so that the light from the lamp 1 is directly applied to the document surface 4.

The light amount adjustment at both ends of the document surface in the fourth embodiment is as follows.
As shown in FIG. 8, a light blocking member 37 as a light amount adjusting member.
Is attached to the window 36 by means of a pin 38 and an elongated hole 39 so that the light quantity at both ends of the document surface can be changed according to the position of the light shielding member 37 as shown in FIG. It can be adjusted like F ″.

FIGS. 10 to 13 are various modifications showing the relationship between the shape of the window 36 in the fourth embodiment and the mounting state of the light shielding member 37 which is inserted into and removed from the window.

As described above, according to the present invention, a compact and excellent lighting efficiency is provided without unevenness in the illuminance distribution due to the light emitting points of the lamp and unevenness in the illuminance distribution due to insufficient light quantity at both ends of the lamp. it can.

[Brief description of drawings]

FIG. 1 is a perspective view showing an illuminating device according to a first embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a light quantity distribution diagram of a document surface, and FIGS. 2 is a side view showing the third embodiment, FIG. 6 is a perspective view showing the fourth embodiment, and FIG.
Fig. 8 is a side view, Fig. 8 is a plan view of a reflecting mirror shade with light quantity adjusting members attached to both ends, Fig. 9 is a light quantity distribution diagram by the reflecting mirror shade, Fig. 10, Fig. 11, Fig. 12・ FIG. 13 is a plan view of a part of a reflector that shows various light amount adjusting members, FIG. 14 is a perspective view showing a conventional lighting device, FIG. 15 is its front view, and FIG.
The figure is a light quantity distribution diagram of the document surface by the illumination device of FIG. 1 ... Multi-point light emitting tubular lamp, 4 ... Original surface (illuminated member surface), 32 ... First reflecting mirror shade, 31.33 ... Second reflecting mirror shade,
34 …… Third reflector, 37 …… Shading member.

Claims (1)

(57) [Claims] 1. A multi-point light-emitting tubular lamp, a first reflector which surrounds the lamp except for both ends thereof, and which regulates light directly from the lamp to an illuminated portion, and receives light from the lamp and the first reflector. A second reflective shade that reflects toward the illuminated portion, and a pair of third reflective shades that surround both ends of the lamp and that reflect the light from the lamp directly toward the illuminated portion. Lighting equipment.