JPH04131837A - Illuminator - Google Patents

Abstract

PURPOSE:To stabilize rising characteristic at the time of lighting by providing a movable light source position adjusting member which integrally holds a light source and a proximity conductor. CONSTITUTION:A fluorescent lamp 3 being the light source is simply fixed to the U-shaped pawl 5a of the light source position adjusting member 5. The proximity conductor 4 is nearly as long as the fluorescent lamp 3, and fixed in an up-and-down direction by the other pawl 5c of the member 5 and fixed in a right-and-left direction by a wall 5b set in one part of the member 5, then the fluorescent lamp 3 and the proximity conductor 4 are set in an illuminating device with a uniform gap. The member 5 can move in a direction parallel with an original 1 in a state where it simultaneously holds the fluorescent lamp 3 and the proximity conductor 4, and is moved according to the state of illuminance distribution on a photosensitive body 10 so as to obtain the appropriate illuminance distribution. Thus, the lighting characteristic of the light source is stabilized without increasing production cost.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is used in image forming apparatuses such as electrophotographic copying machines, printers, fax machines, etc., which have an illumination system that focuses reflected light from the surface of a document on a photoreceptor. This invention relates to a lighting device suitable for.

(Prior Art) Conventionally, as shown in FIG.
In the illumination device that illuminates the original 101 held by the fluorescent lamp 1 and guides the reflected light to the surface of the photoreceptor 110, the fluorescent lamp 1
In order to improve the rising characteristics of the fluorescent lamp 103 at the initial stage of lighting, a conductor 104 is placed near the fluorescent lamp 103 as a light source in the longitudinal direction.
It is common to install .

For example, a conductor such as a copper plate, an aluminum plate, or a pattern on a board may be installed in the vicinity of the fluorescent lamp 103 so as not to interfere with the luminous flux of the fluorescent lamp 103 toward the document surface. 3. Improved cathode discharge performance and shortened lighting start-up time.

(Problem to be Solved by the Invention) However, in the above conventional example, the illuminance distribution of the fluorescent lamp 103 is not necessarily constant, and the luminous flux from the fluorescent lamp 103 is reflected on the surface of the original 101 and guided to the imaging lens 109. It is necessary to adjust the position of the fluorescent lamp 103 as a light source so that the illuminance distribution incident on the photoreceptor 110 falls within a certain range.

Therefore, the fluorescent lamp 103 serving as the light source is held by the light source position adjustment member 105, and the frame body 103 is held by the bottle 106.
11, the proximity conductor 104 is fixed separately to the frame 111, and when only the fluorescent lamp 103 is moved for adjustment, the distance between the fluorescent lamp 103 and the proximity conductor 104 is adjusted in the direction of increasing distance. In the case of lighting devices in which the proximity conductor 104 is reduced by 90%, variations occur among individual lighting devices in the rise characteristics of fluorescent lamps and 6 lamps.
This had the disadvantage of adversely affecting the quality of the product.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lighting device with stable lighting start-up characteristics.

(Means for Solving the Problems) In a lighting device having a light source and a proximate conductor provided for improving the rising characteristics of the light source at the initial stage of lighting, the light source and the proximal conductor are held together. , and a movable light source position adjustment member.

(Function) The light source position adjustment member is moved while simultaneously holding the light source and the proximal conductor.

(Embodiment) Figures 1 and 2 show a first embodiment of the illumination device according to the present invention, in which 1 is a document, 2 is a document glass that holds the document, and 3 is a fluorescent light source. light, 4 is a nearby conductor,
5 is a light source position adjustment member; 6 is a screw for fixing the light source position adjustment member 5 to the frame 11; 7 and 8 are lower and upper reflective members for guiding the luminous flux of the fluorescent lamp 3 to the lower surface of the original glass 2; Reference numeral 9 denotes an imaging lens for guiding reflected light from the surface of the document to the photoreceptor 10.

Next, in the above configuration, the fluorescent lamp 3 that is the light source is simply fixed to the U-shaped claw 5a of the light source position adjustment member 5. Further, the proximity conductor 4 has approximately the same length as the fluorescent lamp 3, is fixed in the vertical direction by the other claw 5c of the light source position adjustment member 5, and is installed in a part of the light source position adjustment member 5. Since the wall 5b fixes the fluorescent lamp 3 and the adjacent conductor 4 in the horizontal direction, the fluorescent lamp 3 and the adjacent conductor 4 are installed in the lighting device with a uniform gap between them.

Further, the light source position adjusting member 5 is movable in a direction parallel to the document l while holding the fluorescent lamp 3 and the proximity conductor 4 at the same time, and can move the light source according to the state of the illuminance distribution on the photoreceptor 10. The position adjusting member 5 is moved one distance from the rear, and when an appropriate illuminance distribution is obtained, it is fixed to the frame 11 with screws 6.

FIG. 3 shows a second embodiment of the lighting device according to the present invention,
Components that are the same as those in the first embodiment are given the same numbers, and descriptions of the same functions and effects will be omitted. 4 is bent into a shape 4a that surrounds the fluorescent lamp 3 at both longitudinal ends of the proximity conductor, and the other side is bent into a flat shape 4b so that it can be fixed to the frame 11 with screws 6, and the proximity conductor and the light source position adjustment member are bent. It is integrated.

(Effects of the Invention) As described above, by providing the light source position adjustment member that simultaneously holds the fluorescent lamp and the adjacent conductor, there is an effect of stabilizing the lighting characteristics of the light source without increasing the manufacturing cost.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a lighting device according to a first embodiment of the present invention, FIG. 2 is a plan view of the same device according to the same embodiment, and FIG.
FIG. 4 is a schematic sectional view of a conventional lighting device. Explanation of symbols 3...Fluorescent lamp (light source) 4...Proximity conductor 5...
・Light source position adjustment member Figure 2

Claims (1)

[Scope of Claims] A lighting device having a light source and a proximate conductor provided to improve the initial start-up characteristics of the light source, wherein the light source and the proximal conductor are held integrally and are movable. 1. A lighting device comprising a light source position adjustment member.