JPS62131662A - Color original reader - Google Patents

Abstract

PURPOSE:To stably reciprocate a filter without displacing it in the direction of optical axis by supporting a filter frame by a free end of two plate springs deflected within a plane in parallel with a filter plane. CONSTITUTION:A color separation filter 7 consists of a filter frame 8 fitted with 3 color R, G, B filters, two leaf springs 10 whose one end is fixed to a fixed member 9 and whose free end opposite to the fixed end is fitted to the upper and lower part of the filter frame respectively, a drive system 11 reciprocating the filter frame 8 vertically and a connecting member 12 connecting the filter frame 8 and the drive system 11. When the filter frame 8 is driven reciprocatedly vertically by the drive system 11, the leaf springs 10 are deflected, but the length of the two leaf springs 10 is equal and the spring constant is made equally, then the filter frame 8 is moved in parallel without being tilted. When the connecting member 12 is a link 12b having a pivot 12a at both ends, if the filter frame is deviated laterally, the pivot 12a is turned slightly and the link 12b is tilted to absorb the lateral deviation. Thus, the color information with fidelity to the original is read and the titled reader is made compact.

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 portion as much as possible. Therefore, the applicant previously proposed a method of supporting the filter frame with a temporary spring with one end fixed, but in this method, the fixed end of the leaf spring is on the side facing the filter surface, so the leaf spring is not attached to the filter surface. Since the filter is bent in a right-angled vertical plane, there is a risk that the filter will be displaced in the optical axis direction due to reciprocating driving, making it impossible to obtain color image information that is faithful to the original.

〔the purpose〕

In view of the above points, it is an object of the present invention to provide a color document reading device that can stably reciprocate a filter without displacing it in the optical axis direction.

[Structure] 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 moves it back and forth linearly. In a color document reading device that separates and reads a color document into multiple colors, one end is fixed, and the free ends opposite to this fixed end are attached to the top and bottom of a filter frame, respectively, and are arranged on a plane parallel to the filter surface. Two leaf springs that bend inside, a drive system whose line of action approximately coincides with the center line in the reciprocating direction of the filter frame in the neutral position, and a connecting member that swingably connects the filter frame and the drive system. It is characterized by comprising:

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 light sensor 6 in which one line of light receiving elements is arranged. In front of the line sensor 6, a color original, for example, R (
A color separation filter device 7 is provided for color separation into three primary colors: red), G (green), and B (blue).

As shown in the front view of FIG. 2, this color separation filter device 7 includes a filter frame 8 to which filters of three colors R, G, and B are attached, and one end of which is fixed to a fixing member 9. , two leaf springs 1 whose fixed ends and free ends opposite to each other are attached to the upper and lower parts of the filter frame, respectively.
0 and a drive system 1 that reciprocates the filter frame 8 in the vertical direction.
1, and a connecting member 1 that connects the filter frame 8 and the drive system 11.
It consists of 2.

The two leaf springs 10 have the same length and the same spring constant, and their longitudinal direction extends parallel to the surface of the filter frame 8, so that the two leaf springs 10 are formed in a vertical plane parallel to the filter surface. It is designed to flex inside. In a stationary state where the filter frame 8 is not driven by the drive system 11,
The balance is maintained at a neutral position by two temporary springs 10.

The line of action of the reciprocating driving force of the drive system 11 is the filter frame 8.
The connecting member 12 is formed of a link 12a having, for example, a rib 12a at both ends, which almost coincides with the vertical center line of the reciprocating force at the neutral position of It is connected to the lower part of the filter frame 8.

When the filter frame 8 is reciprocated up and down by the drive system 11, the leaf spring 10 bends, but as described above, the two leaf springs 10
Since the filter frame 8 has the same length and the same spring constant, the filter frame 8 moves in parallel without tilting. However, since the free end of the leaf spring 10 moves in a curve (quasi-circular motion) as shown by the arrow A in the figure, the filter frame 8 causes a lateral shift C. Therefore, in order to absorb this lateral shift, the connecting member 1
2 is provided. That is, when the connecting member 12 is a link 12b having pivots 12a at both ends as described above, when the filter frame shifts laterally, the pivot 12a rotates slightly and the link 12b tilts, thereby absorbing the lateral shift.

As shown in FIG. 3, the connecting member 12 is also provided with a protrusion 12C at the center of the lower part of the filter frame 8, and an annular part 12e at the tip of the drive system 11 is fitted into a horizontally long hole 12d provided in the protrusion 12C. It can also be used as a thing.

Further, the drive system 11 in this illustrated example is provided with a permanent magnet 11a and a moving coil Ilb, and is configured to drive the filter frame 8 by electromagnetic repulsion and attraction, but in this case,
Moving coil 1 of drive system 11 instead of the connecting member
A barrier may be provided on the side of 1)) to absorb the lateral displacement of the filter frame 8.

In the example shown in FIG. 2 above, the free end of the plate spring 10 is attached to the top and bottom of one side of the filter frame 8, but in order to make the holding of the filter frame 8 by the plate spring more stable, the free end of the plate spring 10 is attached as shown in Fig. 4. It can also be attached to the center of the filter frame 8. (a) is a front view thereof, and (b) is a plan view thereof. In this embodiment, a protrusion 13 is provided on the filter frame 8 to avoid interference between the leaf spring 10, the filter frame 8, and the connecting member 12. Attach the free end of the leaf spring 10 to.

FIG. 5 is a front view showing another embodiment. In this embodiment, in order to further improve the stability of the filter frame 8, leaf springs 10 are attached to the top and bottom of one side of the filter frame 8 as shown in FIG. In addition, a second leaf spring 14 is provided on the opposite side, and the filter frame 8
is pressed from above and below. Since the second leaf spring 14 is not fixed to the filter frame, it only generates a slight sliding frictional resistance against lateral displacement and does not hinder movement. This second temporary spring 14 is preloaded to such an extent that the pressing force does not disappear even if the filter frame 8 moves to a predetermined maximum movement amount.

In the embodiment shown in FIG. 6, the positional relationship between the filter frame 8 and the leaf springs 10 to 14 is changed in order to make the structure shown in FIG. 5 more compact. That is, as shown in the front view of (a), the free ends of the leaf springs 10 and 14 are located on the lower end of the filter frame 8 on the side far from the fixed end, and the temporary springs 10 and 14 As seen in the plan view of (b), the protrusions 1 and 1 intersect with each other.
5 on the filter frame 8 and position each free end thereon,
The structure is such that the filter frames 8 are sandwiched and shifted from each other. Although not shown, the second leaf spring 14 in this example may be omitted to provide only the leaf spring 10, and its free ends may be attached above and below the filter frame 8 on the side far from the fixed end.

On each side, the line of action of the drive system 11 is aligned with the vertical center line when the filter frame 8 is in the neutral position, or else in a position intermediate between the neutral position and the position of maximum lateral displacement. The best thing to do is to match the vertical center line.
This is preferable from the viewpoint of driving stability.

〔effect〕

As described above, according to the present invention, the refilter frame is supported by the free ends of the two leaf springs that bend in a plane parallel to the filter surface. The filter frame does not move during operation, color image information faithful to the original can be read, and the apparatus can be configured in a compact manner.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a color document reading device according to an embodiment of the present invention, and FIGS. 2 to 6 show embodiments of a color separation filter device applied to the color document reading device of the present invention. It is an explanatory diagram. 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...fixing member, 10...plate spring, 11
... Drive system, 12... Connection member, 13... Protrusion,
14... Second leaf spring, 15... Protrusion, R, G,
B...filter, X...optical axis. Figure 3 Figure 4 (a) (b) 1a

Claims (4)

[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 is fixed, and the free ends on the opposite side of the fixed end are attached to the top and bottom of the filter frame, respectively, and the two leaf springs are bent in a plane parallel to the filter surface, and the line of action of the force is at the neutral position. 1. A color document reading device comprising: a drive system that substantially coincides with a center line in a reciprocating direction of a filter frame; and a connecting member that swingably connects the filter frame and the drive system. (2) A color document reading device according to claim 1, characterized in that projections are provided at the upper and lower center portions of the filter frame, and the free ends of the leaf springs are attached to the projections. (3) The color document reading device according to claim 1, wherein the free ends of the leaf springs are attached to the upper and lower ends of the filter frame on the side far from the fixed end. (4) In claim 1 or 3,
Two second leaf springs are provided, one end of which is fixed at a position opposite to the fixed position of the leaf spring, and the other end of which slides into contact with the upper and lower parts of the filter frame under preload. Color original reading device.