JPS62128267A - Color original reader - Google Patents

Abstract

PURPOSE:To drive stably a filter frame without a slide friction part by adopting the constitution that the filter frame supported turnably to plural links is held on the home position at the standstill state and energized in the reciprocating direction at driving by a spring member. CONSTITUTION:In operating a driver 12 to reciprocate vertically the filter frame, a 3-color (R, G, B) filter provided to the filter frame 8 crosses an optical axis X vertically and a color picture of one line is separated into 3-primary color picture information from a line sensor and read. In reciprocating the filter frame 8, the filter frame 8 is supported turnably by the links 9, 9 and the links 9, 9 are energized by extension coil springs 11, 11 in the reciprocating (vertical direction of the filter frame 8, then the filter frame 8 is not tilted in a direction at right angles to the optical axis X and stable reciprocating drive is obtained. The number of the links 9 can be reduced to 2, 3 or 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a color document reading device suitable for separating and reading a document into a plurality of colors.

[Prior art]

As a method to separate and read a color original into multiple colors,
Color filters of three primary colors are arranged in parallel on the front of the line sensor,
A technique has been proposed in which a color document is read by reciprocating the document (see Japanese Utility Model Application Publication No. 166556/1983). According to this technique, an economical color document reading device with an extremely simple configuration can be obtained.

However, when realizing the above device, the drive source cannot be made very large in order to downsize the device. In addition, the filter must be moved back and forth with low noise and at a fairly high speed. Therefore, it is necessary to reduce the sliding friction part as much as possible, but this will make the movement of the filter unstable.
There have been problems such as swinging in the optical axis direction or tilting in a direction perpendicular to the optical axis, making it impossible to obtain color image information faithful to the original.

〔the purpose〕

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a color document reading device that eliminates sliding friction parts and can stably reciprocate a filter using a small drive source.

〔composition〕

In order to achieve the above object, the color document reading device of the present invention arranges a filter frame having a plurality of color filters in front of a line sensor that reads image information and reciprocates the filter frame linearly, thereby reading a plurality of color documents. In a color document reading device that separates and reads images into different colors, one end of each of at least two links is rotatably attached to the filter, and each other end of the link is rotatably attached to a fixed member, and the link is further attached to the filter. It is characterized in that it is provided with a spring member that holds it in the neutral position.

FIG. 1 is a schematic diagram showing an embodiment of a color document reading device according to the present invention. In the figure, a document 2 conveyed on a contact glass 1 is illuminated by a light source 3,
The image passes through a mirror 4 and an optical lens 5 and is formed on a line sensor 6 in which one line of light receiving elements is arranged.

A color separation filter device 7 is provided in front of the line sensor 6 to separate the color original into three primary colors, for example, R (red), G (green), and B (blue).

This color separation filter device 7 has three colors R, G, and B, as seen in the side sectional view in FIG. 2(a) and the perspective view in FIG.
The filter frame 8 includes a filter frame 8 to which a filter is attached, and links 9.9 that support the filter frame 8 so as to be vertically rotatable. The other ends of the links 9, 9 are fixed members 10
It is rotatably supported. The link 9.9 is connected to the tension coil springs 11, 1 as shown in FIG. 2(a).
1 is held in a neutral position in its rest state. At this time, the tension coil pins 11.11 may be fixed to the links 9, 9, or may be fixed to the upper and lower positions of the filter frame 8.

At this neutral position, the center of the central filter G among the three color filters coincides with the optical axis X.

In addition, as shown in FIG. 2(b), in the case of a two-color filter, the center portion of the light-shielding portion S between the filters F is aligned with the optical axis X. Furthermore, a drive device 12 is provided below the filter frame 8 for reciprocating the filter frame.

In the color document reading device configured as described above, when the drive device 12 is operated to reciprocate the filter frame up and down, the R2O and B three color filters provided in the filter frame 8 sequentially move the optical axis X in the vertical direction. A color image of one line is read out from the line sensor 6 by being separated vertically into image information of three primary colors. When the filter frame 8 is driven back and forth, the filter frame 8 is rotatably supported by a link 9.9, and the link 9.9 is supported by a tension coil spring 11°1.
1 biases the filter frame 8 in the reciprocating (up and down) direction, the filter frame 8 is not tilted in the direction perpendicular to the optical axis X, and stable reciprocation can be achieved. Note that instead of the tension coil springs 11 provided above and below the filter frame 8' shown in FIG. 2, a spiral spring lla may be provided at the base end of the fixing member 10 of the link 9 as shown in FIG. A similar effect can be given.

In the above configuration, the number of links 9 may be two, three, four, etc., but FIG. 4 shows an example of two links. In this case, a planar four-bar link configuration is used. If the filter frame 8 is rotatably supported on a vertical line passing through the center of gravity of the filter frame 8 to which the filter is attached, stable drive can be obtained without applying a torsional moment to the drive system. Further, it is preferable to make the bearing length L of the pivot 13 of the filter frame rotation support part as long as possible because stable driving can be achieved. This also applies to the pivots 13 of the ten examples of fixing members of the links 9.

Figure 5 is a skeleton diagram showing an example of four links.
In this case, pivots 13 are provided at the four corners of the rectangular filter frame. In addition, in the case of 3 links, 2 of the 9 links
The books are placed at both ends of the top or bottom of the filter frame, and the other two books are placed in the center as shown by broken lines.

If the tension coil spring 11 or the spring spring 11a is provided on one of the plurality of links 9, the minimum usage is sufficient, but in this case, the filter frame 8
It is necessary to provide the link 9 attached on a vertical line passing through the center of gravity of the link 9. Furthermore, for stable driving, it is preferable to arrange the spring members at symmetrical positions with respect to the center of gravity. In addition, as shown in FIG. 2(a), the coil spring 1
1 may be arranged one above the other so as to be biased in both the up and down directions.

〔effect〕

As described above, according to the present invention, the filter frame rotatably supported by a plurality of links is held in a neutral position by a spring member in a stationary state, and is biased in the reciprocating direction when driven. Therefore, the filter frame does not tilt with respect to the direction perpendicular to the optical axis, and displacement in the optical axis direction is suppressed to a minimum, and the filter frame can be stably driven without a sliding friction portion.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a color document reading device according to the present invention, and FIG. 2(a) is a side cross-sectional view of an embodiment of a color separation filter device applied to this color document reading device. Figure 4 (b) is a sectional side view of the filter frame in the case of a two-color filter, Figure 3 is a side view of the base end of the link when a spiral spring is provided, and Figure 4 is a perspective view of one embodiment of the filter frame. 5 are skeletal diagrams illustrating link configurations. DESCRIPTION OF SYMBOLS 1... Contact glass, 2... Document, 3... Light source, 4... Mirror, 5... Optical lens, 6... Line sensor, 7... Color separation filter device, 8... ...Filter frame, 9...Link, 10...Fixing member, 11
...Tension coil spring, lla...Clockwork spring,
12... Drive device, 13... Pivot, R, G, B
, F...filter, X...optical axis. Agent Patent Attorney Crest 1) Makoto 1 Figure 3

Claims (3)

[Claims] (1) In a color document reading device that separates a color document into multiple colors and reads them by disposing a filter frame having a plurality of color filters in front of a line sensor that reads image information and moving it back and forth linearly, One end of each of at least two links is rotatably attached to the filter frame, and each other end is rotatably attached to a fixed member, and a spring member is further provided to hold the link in its neutral position. A color document reading device featuring: (2) A color document reading device according to claim 1, wherein the spring member is a tension coil spring. (3) A color document reading device according to claim 1, wherein the spring member is a spiral spring.