JPH0648506Y2 - Original illumination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of Invention] [Industrial Application Field] The present invention is located at the longitudinal end of a tubular light source lamp of a document illuminating device such as an image forming device or an image recording device, and The present invention relates to an auxiliary reflecting mirror in a direction intersecting with.

"Prior Art" Conventionally, an auxiliary reflecting mirror with an adjustable amount of reflected light at the longitudinal end of a tubular lamp, which is used in a document illuminating device having a main reflecting mirror and a sub-reflecting mirror for reflecting a tubular lamp, is a rectangle. It was configured to be movable and adjustable with a plane mirror or something similar in shape.

"Problems to be solved by the device" Due to its shape, the auxiliary reflector is moved vertically away from the tubular lamp in a direction parallel to the document surface while keeping the position vertical to the longitudinal direction of the tubular lamp. If this is attempted, the light flux reflected from the main reflecting mirror side by the auxiliary reflecting mirror and reaching the illuminated area of the platen is reduced, but the light flux reflected from the auxiliary reflecting mirror side by the auxiliary reflecting mirror and reaching the illuminated area of the original table. Will be a lot. That is, there is a drawback that the efficiency of adjusting the light quantity at the longitudinal end portion in the illuminated area on the original surface by the auxiliary reflecting mirror is poor. This is because the ratio of the luminous flux from the main reflecting mirror side to the luminous flux from the sub-reflecting mirror side in the illuminated area is 1: 1.
The closer to, the worse the adjustment efficiency.

The present invention improves the shape of the auxiliary reflecting mirror so as to eliminate the disadvantage of the above-described conventional example, that is, the inefficiency in adjusting the reflected light amount by moving the auxiliary reflecting mirror, thereby improving the light amount of the original document. An object is to provide a lighting device.

[Constitution of device]

"Means for Solving Problems" The present invention is a tubular light source for illuminating a document placed on a document table,
A main reflecting mirror having a reflecting surface on the inside, which is arranged on the opposite side of the manuscript table with respect to the tubular light source, opens toward the manuscript table, and surrounds the tubular light source over substantially the entire length of the tubular light source in the longitudinal direction, and a main reflecting mirror. A sub-reflecting mirror, which has approximately the same length and is arranged in parallel with the main reflecting mirror, reflects the light directly incident from the tubular light source and the light incident from the main reflecting mirror toward the platen, and the longitudinal end of the tubular light source. The light is incident from the main reflecting mirror side and the light entering from the sub-reflecting mirror side and has an anti-slope that intersects the longitudinal direction of the tubular light source and is directed toward the region corresponding to the end of the document table in the longitudinal direction of the tubular light source. In an original illuminating device having a reflecting auxiliary reflecting mirror, the auxiliary reflecting mirror is movable in a direction approaching the main reflecting mirror and a direction approaching the sub-reflecting mirror, and its reflecting surface is on the side of the main reflecting mirror. Reflection of light that is incident from and reflected toward the platen A document illumination apparatus characterized by the reflection area of the light reflected toward the platen incident from the product and the secondary reflecting mirror side has a shape that decreases both increase or both depending on the direction of movement.

"Function" From the non-reflecting area, the amount of the tubular light source, the reflected light of the main reflecting mirror, and the reflected light of the sub-reflecting mirror increases or decreases in the same direction according to the position of the auxiliary reflecting mirror, and the tubular shape of the auxiliary reflecting mirror The light amount of the end portion in the longitudinal direction of the illuminated area on the document surface is adjusted by the light source.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view.

Reference numeral 1 is a tubular lamp that serves as a light source for certifying the original 2, 1a is a light emitting line (center of the light emitter), and 1b is an outer wall of tubular glass containing the light emitter. Main reflecting mirrors 3 and 4 are arranged integrally with the illuminated area 8 on the surface of the original 2 placed on the glass original 6 in contact with the image side, with the tubular lamp 1 under the original 6 interposed. ing.
The main reflecting mirrors 3 and 4 are opened toward the illuminated area 8 of the document, are surrounded over the entire length of the tubular lamp 1 in the longitudinal direction, and the inside is a reflecting surface. Reference numeral 5 is substantially the same length as the main reflecting mirror 4 and is arranged parallel to the longitudinal direction of the main reflecting mirror 4, and the light of the tubular lamp 1 and the reflected light of the main reflecting mirror 4 are incident on the illuminated area 8 on the original surface. It is a sub-reflecting mirror that reflects light. Reference numeral 7 denotes an auxiliary reflecting mirror which is fixed to the end portion of the tubular lamp 1 in the longitudinal direction such that the reflecting surface intersects with the longitudinal direction and the movement of the reflecting surface is adjustable, and the auxiliary reflecting mirror 7 has a hole. A non-reflective part such as 10 is provided. The auxiliary reflecting mirror 7 is normally orthogonal to the tubular lamp 1, and can be moved and adjusted in a direction parallel to the document table 6 and orthogonal to the tubular lamp 1 (hereinafter referred to as a lateral direction). The auxiliary reflecting mirror 7 reflects the light beam emitted from the tubular lamp 1 in order to correct the light quantity at the longitudinal end of the illuminated area 8 on the original surface.

In the above structure, the luminous flux diverging from the light emitting line 1a of the tubular lamp 1 is roughly divided into two kinds of paths and reaches the illuminated area 8 on the original surface. The first is a light beam a which is emitted from the light emitting line 1a and reaches the illuminated area 8 directly, and a light beam b which is reflected by the main reflecting mirror 3 or 4 and enters the illuminated area 8, that is, the illuminated area on the original surface. It is a luminous flux that enters the area 8 from the tubular lamp 1 side. Secondly, the luminous flux c diverging from the emission line 1, reflected by the sub-reflecting mirror 5 and incident on the illuminated area 8, is reflected by the main reflecting mirror 3 and is reflected by the sub-reflecting mirror 5. Is a light beam d which is incident on the illuminated area 8, that is, a light flux which is incident on the illuminated area 8 on the document surface from the side of the sub-reflecting mirror 5. In the case where the two kinds of light fluxes are diverged from the emission line 1a and follow various paths, and are reflected by the auxiliary reflecting mirror 7 in the paths, the light fluxes a, b, c, d reach the illuminated area 8. The former luminous flux a, b
On the document surface, the reflection area of the auxiliary reflecting mirror 7 that is effective in correcting the light amount at the longitudinal end of the illuminated area 8 is near the area S1 in FIG. 2, and in the latter case of the light fluxes c and d, near the area S2. is there.

FIG. 3 shows a view obtained by superposing FIG. 1 and FIG. When the auxiliary reflecting mirror 7 is moved in the direction of the arrow L in the figure, the effective reflection areas S1 'and S2' (shown by cross hatching) are both reduced, and the arrow R
Moving in the direction, the effective reflection areas S1 'and S2' both increase. Therefore, the adjusting action of the auxiliary reflecting mirror 7 coincides with the increasing / decreasing direction depending on the moving direction of the auxiliary reflecting mirror 7 at the longitudinal end of the illuminated area 8 by the tubular lamp 1, and is uniform with respect to the moving amount. large.

In the above embodiment, the hole 10 of the auxiliary reflecting mirror 7 may exist near the area S1 in FIG. 4 as well as near the area S2 in FIG. That is, the auxiliary reflecting mirror 7 in FIG.
It may be installed in reverse. Further, the shape of the hole 10 need not be limited to the shape shown in FIGS. In the embodiment, the hole 10 is provided in the auxiliary reflecting mirror 7, but the surface of the hole corresponding to the inside of the reflecting area surrounding the auxiliary reflecting mirror 7 is subjected to a surface treatment so as to be a non-reflecting area. Good.

[Advantage of the Invention] The present invention includes a tubular light source for illuminating a document placed on a document table,
A main reflecting mirror having a reflecting surface on the inside, which is arranged on the opposite side of the manuscript table with respect to the tubular light source, opens toward the manuscript table, and surrounds the tubular light source over substantially the entire length of the tubular light source in the longitudinal direction, and a main reflecting mirror. A sub-reflecting mirror, which has approximately the same length and is arranged in parallel with the main reflecting mirror, reflects the light directly incident from the tubular light source and the light incident from the main reflecting mirror toward the platen, and the longitudinal end of the tubular light source. The light is incident from the main reflecting mirror side and the light entering from the sub-reflecting mirror side and has an anti-slope that intersects the longitudinal direction of the tubular light source and is directed toward the region corresponding to the end of the document table in the longitudinal direction of the tubular light source. In an original illuminating device having a reflecting auxiliary reflecting mirror, the auxiliary reflecting mirror is movable in a direction approaching the main reflecting mirror and a direction approaching the sub-reflecting mirror, and its reflecting surface is on the side of the main reflecting mirror. Reflection of light that is incident from and reflected toward the platen Since the product and the reflection area of the light that is incident from the side of the sub-reflecting mirror and reflected toward the platen are both shaped to increase or decrease in accordance with the moving direction, the document illuminating device is characterized in that There is an effect that the light amount of the auxiliary illumination can be easily adjusted to the region corresponding to the end of the tubular light source of the document table.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a side view in the lateral direction of the original illumination amount, FIG. 3 is a side view showing the operation of FIG. 1, and FIG. 4 is another embodiment. FIG. 1 ... Tubular lamp, 3,4 ... Main reflecting mirror, 5 ... Sub-reflecting mirror, 6 ... Document stage, 7 ... Auxiliary reflecting mirror, 10 ... Hole.

Claims (1)

[Scope of utility model registration request] 1. A tubular light source for illuminating a document placed on a document table, and a tubular light source arranged on the opposite side of the document table and opening toward the document table over substantially the entire length of the tubular light source in the longitudinal direction. A main reflecting mirror that surrounds the tubular light source and has a reflecting surface on the inside, and the light that is directly incident from the tubular light source and the light that is incident from the main reflecting mirror that are arranged in parallel with the main reflecting mirror and have the same length as the main reflecting mirror. A sub-reflecting mirror that is anti-sloping toward the base, and an anti-slope that is arranged at the longitudinal end of the tubular light source and intersects the longitudinal direction of the tubular light source. In an original illuminating device having an auxiliary reflecting mirror that reflects incident light toward an area corresponding to a longitudinal end of a tubular light source of an original table, the auxiliary reflecting mirror is closer to the main reflecting mirror and the auxiliary reflecting mirror. It is movable in the direction of approaching the reflecting mirror, and its reflecting surface is The reflection area of light that enters from the side of the main reflecting mirror and is reflected toward the document table and the reflection area of light that enters from the side of the sub-reflecting mirror and that reflects toward the document table both increase in accordance with the moving direction. A document illuminating device characterized in that both have a decreasing shape.