JPS63136564A - Reader for color draft - Google Patents

Abstract

PURPOSE:To obtain image characteristics having high resolution and excellent color separation easily by mounting a color filter on the draft surface side of a transparent glass plate and fast sticking the color filter to a draft through a thin protective film in the transparent glass plate on which the draft is placed. CONSTITUTION:A color filter 11 is formed onto a draft-base glass plate 13, and a protective film 12 consisting of a resin, etc., is shaped to the upper section of the filter. A color draft 17 is irradiated with a incandescent lamp 15, and the color separation beams of each of red, green and blue acquired through the color filter 11 on the draft-base glass plate 13 fast stuck to the color draft are condensed by using an equal-magnification type near parabolic fiber 16, and imaged onto a solid-state image sensing device 14. The color filter is attached closely to the color draft through a thin protective film (several mum), thus obtaining image characteristics having high resolution and excellent color separation characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the formation of a color filter in a color document reading device.

[Conventional technology]

As solid-state imaging devices in color document reading devices, CCD type or MO8 type solid-state imaging devices that use a reduction optical system are currently mainstream. Microman 5 solid-state imaging device hZ using an optical system
, has been researched and developed and realized.

As an example of a method for realizing a contact solid-state imaging device, 1. A large-area solid-state imaging device #ht can be mentioned. Methods for converting this solid-state imaging device into v7t color include a color filter method in which white light is irradiated onto the image and separated into three primary colors using a color filter;
It is broadly classified into the photocondylar method, in which primary colored light is irradiated onto the image area in a time-divided manner, and the reflected light is used to perform color separation.

FIG. 3 shows a conventional example of a color solid-state imaging device in which a light-receiving element 32 is formed on a transparent curtain plate 33 and light is incident from the wooden board side as the color filter method. Here, a gelatin filter or the like that can be formed at low temperature as the three primary color filters 31 is laminated on a transparent substrate on the opposite side from the light receiving element.

[Problem that the invention seeks to solve]

However, in a structure in which a transparent glass substrate is used and the light is incident on the substrate side (Fig. 3), the optical path length between the color filter and the light receiving element surface (the thickness of the transparent substrate is approximately 1 μm) is long, as shown in Fig. 3. As shown in , due to the wide angle of incidence of light, 1
There is a problem that the color separation characteristics and resolution deteriorate to non-zero.

Another problem was that the yield was reduced due to the complication of the manufacturing process, such as forming the color filter by photolithography.

Therefore, the present invention aims to solve these problems, and its purpose is to directly change the structure of the conventional black and white solid-state imaging device by performing color separation on the document surface. The object of the present invention is to provide a color image reading device with very good color separation characteristics and resolution h' without any improvement.

[Means for solving problems]

The color document reading device of the present invention is characterized in that a transparent glass plate on which a document is placed is provided with a color filter on the document surface side of the transparent glass plate.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples.

FIG. 1 shows an example of a configuration diagram of a color image reading apparatus according to an embodiment of the present invention in which a color filter 1 is formed on a document table glass plate 3 on which a document is placed. That is, the color original 7 is irradiated with the white light 5, and the red color obtained through a color filter on the original table glass plate that the color original is in close contact with.
The color-separated lights of green and green are condensed using a 1-magnification focusing optical fiber 6 and concentrated onto the solid-state imaging device 4.

FIG. 2K shows an example of a plan view in which the three primary color filters 21 are stacked on the document table glass plate 22, using an example of a one-dimensional solid-state imaging device. Here, 3w, color color filter 21
#: It is formed of a gelatin filter or an interference filter, and a protective film of resin or the like is provided on the top. In this way, the color filter adheres closely to the color original through the thin protection III (several am), so it is possible to obtain high resolution and good image quality characteristics with color separation layer properties, resulting in clear images. You can get great things.

Here, alignment of the color filter and each light-receiving element of the solid-state imaging device is performed by providing an adjustment function on either the document table glass plate or the solid-state imaging device. In particular, in the case of a -dimensional close-contact type solid-state imaging device, as shown in Figure 1, by forming color filters long enough in stripes in the sub-scanning direction and the paper feeding direction, the elements in the main-scanning direction ( It is very easy to perform alignment with the direction in which the elements are lined up.

〔Effect of the invention〕

As mentioned above, in the transparent glass plate on which the original is placed, color filters are installed on the original surface side of the transparent glass plate, and as a result, it is possible to easily obtain image characteristics with high resolution and good single-color separation characteristics. To obtain h; has the effect of being able to.

Especially solid using a transparent substrate! This is especially true when forming an L&W device and making light incident on the back side of the substrate.

Compared to the conventional case of forming a color filter on the back surface of a curtain plate, in addition to the above-mentioned effects, the production of a color image reading device can be made at a lower cost due to an improvement in yield.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a color image reading device of the present invention. FIG. 2 is a plan view of the color filters laminated on the document table glass plate. FIG. 3 is a structural diagram of a conventional color solid-state imaging device. 11... Color filter 12... Protective film 13.22... Original table glass plate 14...
・Solid-state imaging device 15...White lamp 16...Focusing light 7 Eyeper 17...Color original 21.31...Three primary color filters 32...
...Photodetector 33...Transparent substrate 34...The maximum angle of incidence of light or more Applicant: Seiko Epson Corporation No. 11 Figure 2 Figure 3

Claims (3)

[Claims] (1) A color document reading device characterized in that a transparent glass plate on which a document is placed is provided with a color filter on the document surface side of the transparent glass plate. (2) In the color filter, an interference filter or a gelatin filter is used, and a protective film made of resin or the like is provided on the top of the filter.
The color document reading device described in Section 1. (3) White light is irradiated and reflected light from the original through the transparent glass plate is read by a solid-state imaging device using a one-to-one imaging lens.
The color document reading device described in Section 1.