JPS62131663A - Color document reading device - Google Patents

Abstract

PURPOSE:To attain monochromatic reading by a prescribed filter by locking a filter frame when the filter frame is moved to a position at the outside of the reciprocating moving range and releasing the lock when the filter frame is moved to the further outside. CONSTITUTION:In reciprocating the filter frame 6a, the 3 color separation filters R, G, B formed to the filter frame 6a cross a line image sensor 7 in order in the lateral direction. Thus, one line of color picture is separated into the 3 primary colors picture information and read by the line image sensor 7. In inputting a monochromatic read signal S2 of a prescribed level, an arm 6g is moved to a monochromatic read position MC at the outside of the range LG and locked. In inputting the monochromatic read signal S3, the arm 6g is moved to the monochromatic release position BR at the outside of the monochromatic read position MC and the lock is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a color document reading device that separates and reads a document image into a plurality of color components.

[Prior Art] As a method of reading a document image by separating it into multiple color components, a method has been proposed in which color filters of three primary colors are arranged in parallel in front of a line image sensor and are moved back and forth to read a color document. (Jitsukai 59-166
No. 556). According to this, although an economical color document reading device with a very simple configuration can be obtained, there is a problem that monochrome reading of color documents cannot be performed.

[Objective] The present invention has been made to solve the problems of the prior art described above, and an object of the present invention is to provide a color document reading device capable of monochromatic reading using a predetermined filter.

[Structure] In order to achieve this object, the present invention locks the filter frame when the filter frame is moved to a first position outside the reciprocating range on the movement locus of the filter, and A locking means is provided for releasing the locking when the filter frame is moved to a second position outside the first position and returning the filter frame to its reciprocating range.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 illustrates an optical system in a color document reading device according to an embodiment of the present invention.

In the figure, an original 2 on a contact glass 1 is illuminated by a light source 3, and the image passes through a mirror 4 and an optical lens 5, and is separated into predetermined color components by a color separation filter device 6, and is then separated into one line. The image is formed on a line image sensor 7 in which a number of light receiving elements are arranged. Further, the color separation filter device 6 is provided with a locking mechanism 8 that locks the color separation filter device 6 at a predetermined previous color reading position.

As shown in FIG. 2, the color separation filter device 6 includes a filter frame 6a to which three color separation filters, a red filter R1, a green filter G, and a blue filter B, are attached, and both upper and lower ends of this filter frame 6a. Leaf springs 6b, 6c, and 6d are attached to the parts and regulate the direction of movement of the filter frame 6a.
, 6e, and a drive device 6f that reciprocates the filter frame 6a downwardly. Furthermore, an arm 6fC that forms part of the engagement 11-mechanism 8 is formed at the center of the -L end of the filter frame 6a.

The filter frame 6a has three color separation filters, a red filter R, a green filter G, and a blue filter B, configured in a -1 method corresponding to the light-receiving surface of the line image sensor 7, mounted on a light-shielding plate at predetermined intervals. The driving device 6f is configured by a moving motor, a linear motor, or the like.

In addition, the leaf springs 6b, 6c, 6d, and 6e are
One end of the filter is fixed to a fixing member (not shown) that fixes the color separation filter device 6, and the other end is fixed to the filter frame 6a, so that when the filter is reciprocated by the drive device Wf 6 f, the filter The movement trajectory of the frame 6a is
The trajectory becomes an arc.

Further, in a state where no drive signal is applied to the drive device i'i6:I', the leaf springs 6b, 6c + 6d,
Due to the return force of the filter frame 6e, the filter frame 6a is positioned at the center position where the image passes through the green filter G. Therefore, in this color separation filter device 6, monochrome reading using the green filter G is possible with the drive device 6f not operating.

An example of the locking mechanism 8 is shown in FIG.

In the figure, this locking mechanism 8 includes a locking claw 9 rotatably attached to the tip of an arm 6g of the filter frame 6a by a shaft A, and a locking claw 9 that biases the L claw 9 in one direction. A fixing member (2) that fixes the locking mechanism 8 outside the range LG of the filter frame 6a during normal reciprocating motion along the movement locus OB of the spring 10 and the tip of the locking claw 9. It is composed of two stepped protrusions 11 and 12 that protrude into the movement locus OB from the side (not shown). As described above, since the filter frame 6a reciprocates in a substantially arcuate trajectory, the locus of movement of the arm 6g also follows a similar arcuate path, and thereby the locus of movement of the locking pawl 9 The OB becomes arc-shaped as shown.

The spring 10 is hooked between a fixing pin B formed on the arm 6g and the rear end of the locking claw 9, so that the tip of the locking claw 9 always points in the direction of extension of the arm 6g. Forced to face. Further, the stepped protrusion 11.12 has a peak portion 11a.
, 12a and step portions 11b, 12b, and the peak portion 11
a, 12a are arranged so as to be located on the range LG side.

With the above configuration, if a sine wave signal S1 of amplitude a as shown in FIG. 4 is applied to the drive device 6f and the filter frame 6a is moved back and forth, the R formed in the filter frame 6a, The three color separation filters of G and H cross the line image sensor 7 in order in the transverse direction, so that the line image sensor 7 separates the color image of one line into image information of the primary colors and reads it out. .

At this time, the locking pawl 9 moves in the range LG while drawing a movement locus OB on a semi-circular arc, as if it were continuous. Therefore, in such a color reading state, the locking mechanism 8 is not involved in any way.

Here, if a monochromatic reading signal s2 of a predetermined level b larger than the amplitude a of the sine wave signal s1 is input to the drive device 6f, the arm 6g attempts to move to the monochromatic reading position MC outside the range LG. do.

At this time, the locking pawl 9 comes into contact with the crest 11a of the stepped projection 11, and therefore the locking pawl 9 swings in the escape direction, and when the tip of the locking pawl 9 crosses the crest 11a, The locking pawl 9 tries to return to the neutral position by the action of the spring 10, but
Its tip abuts against the stepped portion 11b and cannot return any further, remaining tilted with respect to the neutral position.

Here, when the application of the monochromatic reading signal S2 to the drive device 6f is stopped, the leaf springs 6b, 6c, 6d,
The arm 6g attempts to return to the neutral position due to the restoring force of the arm 6e, but at this time, the locking claw 9 touches the ridge 11a of the stepped protrusion 11.
As a result, the arm 6g is stopped at that position, and the filter frame 6a is also stopped at that position.

In this state, the blue filter B is located in the filter frame 6a at a position corresponding to the line image sensor 7, so monochromatic reading using the blue filter B can be performed.

When the monochrome reading by the blue filter B is completed in this way, if the monochrome release signal S3 of a predetermined level C, which is higher than the level b, is input to the drive device 6f, the arm 6g is moved to the outside of the monochrome reading position MC. Move to the first color release position BR.

At this time, the tip of the locking claw 9 is connected to the stepped portion 11b of the stepped projection 11.
When released, the locking pawl 9 is free to swing, and therefore the locking pawl 9 returns to the neutral position by the action of the spring 10.

Here, when the application of the drive signal to the drive device 6f is stopped, the arms 6g are moved by the leaf springs 6b, 6c, 6d,
Due to the restoring force of 6e, it begins to move toward the neutral position. At this time, the locking pawl 9 rotates in the escape direction and sequentially abuts the stepped portion 11a and the peak portion 11b of the stepped projection 11, and when it passes the peak portion 11b, it becomes free to swing, and the spring 10 It returns to the neutral position by the action of .

Therefore, at this time, the locking claw 9 moves smoothly, the arm 6g returns to the neutral position, and the filter frame 6a returns to the neutral position.

In this way, the arm 6g is positioned at the monochrome reading position, so that the leaf springs 6b, 6c, 6d, and 6e are at their neutral positions. In this case, monochrome reading using blue filter B becomes possible.

Furthermore, when selecting monochrome reading, it is sufficient to apply the monochrome reading signal S2 at level b for an extremely short period of time (that is, a sufficient time to lock the leaf spring 6b), and when canceling monochrome reading, level C It is sufficient to apply the monochrome release signal S3 in a pulsed manner, so that the driving device 6 during monochrome reading can
The power consumption of f becomes extremely small.

Furthermore, when positioning the arm 6g at the monochromatic reading position corresponding to the stepped protrusion 12, that is, the monochromatic reading position using the red filter R, it is sufficient to apply a signal of the same level and opposite polarity to the monochromatic reading signal S2 described above. Moreover, when returning from that position to the normal reciprocating position, it is sufficient to apply a signal of the same level and opposite polarity to the monochromatic release signal S3.

FIG. 5 shows another example of the locking mechanism 8. This locking mechanism 8 is provided with locking claws 21 and 22 formed on both sides of the tip 20 of the arm 6g of the filter frame 6a, and is arranged corresponding to the monochromatic reading position, and is rotatable about axes C and D. The two locking levers 23, 24 that are installed and these locking levers 2
It consists of springs 25, 26 that bias 3, 24 in one direction.

Further, the tips of the locking claws 21 and 22 draw a substantially arc-shaped movement trajectory O as the arm 6 moves, and
draws a movement trajectory 0132. And the locking lever 23
．． The tip of 24 is located inside the movement trajectory 082.

With the above configuration, when the driving device 6f is reciprocated by applying the sine wave signal S1 of amplitude a as shown in FIG. 4, that is, in the color reading state, the locking mechanism 8 is not involved in any way 4°Here, if the instep 1 color reading signal S2 of a predetermined level b, which is larger than the amplitude a of the sine wave signal 51, is input to the drive device 6f, the arm 6G will move to the locking lever 23. 6 (a) and (b)).

At this time, the locking pawl 21 comes into contact with the locking lever 23, so that the locking pawl 21 swings in the escape direction, and when the tip of the locking pawl 21 passes the tip of the locking lever 23, the locking pawl 21 comes into contact with the locking lever 23. The stop lever 23 tries to return to the neutral position by the action of the spring 25, but its tip abuts the tip 20b and cannot return any further, remaining inclined with respect to the neutral position.

Here, when the application of the monochromatic reading signal S2 to the drive device 6f is stopped, the leaf springs 6b, 6c, 6d,
The arm 6g attempts to return to the neutral position due to the restoring force of the arm 6e, but at this time the locking lever 23 is connected to the tip 20 and the locking claw 2.
1, the arm 6g is stopped at that position, and the filter frame 6a is also stopped at that position.

As a result, monochrome reading using the blue filter B can be performed.

When the monochrome reading by the blue filter B is completed in this way, by inputting the monochrome release signal S3 of a predetermined level C higher than the level b to the drive device 6f, the arm 6g is further moved from the monochrome reading position MC. It attempts to move to the outer release position BR (see FIG. 6(c)).

At this time, the tip of the locking pawl 22 moves along the slope of the locking lever 2:3 and further rotates the locking lever 23, and when the tip of the locking pawl 22 comes off the locking lever 23, The locking lever 23 is free to swing, so that the locking lever 23 returns to the neutral position under the action of the spring 25.

Here, when the application of the drive signal to the drive device 6f is stopped, the arms 6g are moved by the leaf springs 6b, 6c, 6d,
Due to the restoring force of 6e, it begins to move toward the neutral position. At this time, with the locking lever 23 rotated in the escape direction, the locking claw 22, the tip 20, and the locking +Th claw 21 are sequentially brought into contact (see FIGS. 6(d) and (e)), and the tip thereof is When it passes the locking pawl 21, it becomes free to swing and returns to the neutral position by the action of the spring 25.

In this way, hold the locking lever 23'2 at the tip 2 of the arm.
0 and locking claw 21. ．． 22 moves smoothly and arms 6G
returns to the neutral position, and the filter frame 6a returns to the neutral position.

Further, when positioning is at the monochrome reading position on the locking lever 24 side, that is, the monochrome reading position by the red filter R =11-, it is sufficient to apply a signal having the opposite polarity and the same level as the above-mentioned monochrome reading signal S2. Moreover, when returning from that position to the normal reciprocating position, it is sufficient to apply a signal of the same level and opposite polarity to the monochromatic release signal S3.

In addition, in the embodiment described above, the filter frame 6a is attached to the plate spring 6.
b, 6c, 6d, and 6e, the arm 6g draws a nearly arcuate trajectory, but even if this trajectory is a straight line, the present invention can be applied in the same way. can.

Therefore, the present invention can be applied to a structure in which the filter frame 6a is supported and guided by a mechanism such as the one described above and is moved back and forth, for example, even if the filter frame 6a is supported and guided by a link or a guide. .

Furthermore, in the above embodiment, one arm is provided on the filter frame, and a locking mechanism is constructed between this arm and the fixing member that fixes the color separation filter device. is not limited to this, and other equivalent mechanisms can be used.

[Effect] As explained above, according to the present invention, when the filter frame is moved to the first position outside the reciprocating movement range on the movement locus of the filter, the filter frame is locked and the first position is When the filter frame is moved to a second position outside of the second position, a locking means is provided that releases the lock and returns the filter frame to its reciprocating range, making it possible to perform monochromatic reading using a predetermined filter. A color original reading device is obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram illustrating an optical system of a color document reading device according to an embodiment of the present invention, FIG. 2 is a perspective view illustrating an example of a color separation filter device, and FIG. 3 is a diagram of a locking mechanism. A schematic configuration diagram showing one example, FIG. 4 is a waveform diagram showing signals applied to the drive device, FIG. 5 is a schematic configuration diagram showing another example of the locking mechanism, and FIGS. 6(a) to ( e) is a configuration diagram for explaining the operation of the locking mechanism shown in FIG. 5; 6... Color separation filter device, 6a... Filter frame,
6g...arm, 8...locking mechanism, 9,21.22...
・Latching claw, 10, 25.26... Spring, 11.12・
...Stepped protrusion, 20... Tip, 23, 24... Locking lever. Figure 2 6 b Figure 3? b-〇B Figure 4 Figure 5 b Figure 6 (d) (e)

Claims (1)

[Claims] In a color document reading device that separates and reads a color document into a plurality of colors by placing a filter frame having a plurality of color filters in front of a sensor that reads image information and reciprocating the image information, a filter frame having a plurality of color filters is disposed in front of a sensor that reads image information and is read. The filter frame includes a locking pawl biased in one direction and an engaging member that engages with the locking pawl at a predetermined position, and the filter frame is moved to a first position outside its reciprocating range. At times, the locking claw and the engaging member engage with each other to lock the filter frame, and when the filter frame is moved to a second position further outside the first position, the locking claw and the engaging member engage with each other and lock the filter frame. A color document reading device characterized by comprising a locking means for releasing the engagement with the engagement member and returning the filter frame to the reciprocating range.