JPH04100475A - image input device - Google Patents

Abstract

PURPOSE:To simplify the optical system of a picture input device so that the optical system can be easily adjusted by constituting a light leading means of optical fibers provided against photoelectric conversion elements one to one and color separating means of color filters provided between the optical fibers and photoelectric conversion elements. CONSTITUTION:Irradiating light emitted from a light source 1 irradiates a film original 7 after the light is condensed by means of a condenser lens 3 and the colored light passed through the original is separated into three colored light R, G, and B by means of each optical fiber 12, with the light of each color being made incident to their corresponding color filters 11r, 11g, and 11b. Each color filter 11r, 11g, and 11b is adjusted in density and the transmittance of each color is corrected by means of a CCD 6 so that the optimum exposure can be obtained in accordance with the sensitivity of each sensor 13. After correction, each colored light is made incident to each sensor 13 of CCDs 6r, 6g, and 6b. Accordingly, each color is read by each sensor 13 and subjected to photoelectric conversion. Therefore, the optical system itself becomes very simple, because not only the need of color separation prism 5 and image forming lens 4 but also the need of adjusting the image forming position can be eliminated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides an image-powered device that illuminates a document from a light source, reads the transmitted light transmitted through the document by a photoelectric conversion element, and manually inputs the light to an information processing device such as a computer. It is related to.

[Conventional technology]

This type of image input device reads and inputs an image original such as a film original into a computer, for example, and among these, a device that reads a color original is also called a color scanner. Document reading methods using color scanners include a three-plate type that uses a color separation prism, a three-exposure type that uses filter replacement or illumination light switching, and a color sensor type that uses a color filter on a CCD sensor as an optical reading element. are known.

Among these, the three-time exposure method takes time to read. On the other hand, the color sensor type has the problem that it is difficult to adjust the illumination light and exposure time to equalize the sensor output of each color, in other words, the sensitivity, and the difference in dynamic range caused by the difference in output amplification factor. The problem is how to handle it.

Therefore, in general, a method of reading the original using a color separation prism is often adopted. An example of this is a so-called film scanner, which reads film originals. As shown in Fig. 3, this type of film scanner includes a light source 1 consisting of a halogen lamp, and a light source #1 of the light g1.
An illumination lens 3 as an illumination means arranged along the 2nd axis, an imaging lens 4 as a light guiding means arranged behind the illumination lens 3, and a light image formed by the imaging lens 4. A color separation prism 5 separates the colors, and a CCD sensor array (hereinafter referred to as an optical reading element) serves as an optical reading element that reads the optical image separated into each color of R (red), G (green), and B (blue) by the color separation prism 5. A film original 7 is inserted between an illumination lens 3 and an imaging lens 4, and a film original 7 is inserted between an illumination lens 3 and an imaging lens 4. The image information formed in the image data is read by the CCDs 6r, 6g, and 6b. However, since each color of R, G, and B separated by the color separation prism 5 has a wide wavelength width, CCDs 6r and 6g are used to extract specific wavelength ranges.
, 6b are inserted, and the peak wavelengths of each color of R, G, and B are selected and the CCD 6 is
r, 6g.

6b.

[Problem to be solved by the invention]

By the way, in the above-mentioned filter scanner, it is necessary to select and install the trimming filters 8r, 8g, 8b according to the color separation characteristics of the color separation prism 5 and the sensitivity of the CCD 6, and it is also necessary to adjust the focus of the imaging lens. , these and CCD6r, 6g.

It is undeniable that the optical system becomes complicated and the adjustment work becomes troublesome and difficult, such as the adjustment accompanying the attachment of the CCD 6 to accurately set the relative position of the CCD 6b.

This invention was made in view of the actual situation of the conventional three-panel image input device, and its purpose is to simplify the optical system and improve the optical system's I! The object of the present invention is to provide an image-powered device that is easy to adjust.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a light source, an irradiation means for irradiating the irradiation light emitted from the light source onto a document to be read, a light guide means for guiding the light transmitted through the document, and a light guide means. In an image-powered device equipped with a color separation means for color-separating a light image guided by a color filter, and a photoelectric conversion element for reading and photoelectrically converting the light image of each color separated by one color, the light guide means is a photoelectric conversion element. The present invention is characterized in that the optical fibers are provided in one-to-one correspondence, and the color separation means is formed by a color filter provided between the optical fiber and the photoelectric conversion element.

Note that it is desirable that the color filter also serve as a light amount adjustment filter that adjusts the amount of light incident on the photoelectric conversion element by selecting or selecting its density.

[For production]

With the configuration shown in F, the light emitted from the light source passes through the irradiation means, the document, and the optical fiber as the light guiding means, and reaches the color filter, and the color filter changes the color, for example, R, G,
It is separated into each color of B.

At that time, the amount of light for each color can be adjusted by appropriately setting or selecting the density of the color filter. 1111 can also be done at the same time.

〔Example〕

FIG. 1 is a schematic diagram of an image input device according to an embodiment of the present invention. In the following description, the same reference numerals are given to the same parts as in the conventional example described above, and redundant description will be omitted.

The image input device according to this embodiment omits the imaging lens 45, color separation filter 5, and trimming filter 8r*8g+8b of the image input device in the conventional example described above, and has three components as shown in FIG. Optical fiber group 10r
, log, lOb and each optical fiber group 10r, L
og, R and G at the downstream part of the light emission direction of 10b.

B color filters llr, llg, and llb are provided, and CCDs 6r, 6g, and 6b are provided in the light emission direction of each color filter llr, llg, and llb, respectively.

The optical fibers 12r, 12g, 12b (hereinafter generally referred to as 12) constituting each optical fiber group 10r, 10g, 10b are arranged in two rows corresponding to each color of R2O and B, as shown in FIG. Optical fiber 12r, 12g
.

The optical fibers 1.2r, 12g, and 12b corresponding to each color are arranged in a line so as to alternate, and the optical fibers 1.2r, 12g, and 12b are grouped together to form optical fiber groups 10r, Log, and 10b. And each optical fiber 12-1r, 12-
2r.

12-3r, 12-4r, 12-1g, 12-2g
, 12-3g, 12-4g, 12-], b, 12
-2b, 12-3b, 12-4b are CCD6 r,
6g.

Each sensor 13-1r, 13-2r, 13-3 of 6b
r, 13-4r, 13-1g, 13-2g, 13
-3g, 13-4g, 13-1b, 13-2b.

13-3b, 13-4b (hereinafter generally indicated by the reference numeral 13) in the same order on a one-to-one basis, and the optical signals are sent to the CCD 6 for each image arranged in a line.
It is used as reading information. In this embodiment, only 4×3 images are illustrated for convenience of illustration, but it goes without saying that optical fibers 12 for a preset number of images are prepared.

With this configuration, the irradiation light emitted from the light source 1 is focused by the condenser lens 3 and irradiates the film original 7, and the colored light transmitted through the film original 7 is transmitted through each optical fiber 12.
The light is divided into three parts for each color of R, G, and B, and enters the corresponding color filters 11r, 11g, and 11b, respectively. Each filter 11r.

The density of 11g and llb is adjusted, and the transmittance of each color is corrected to the optimum exposure amount according to the sensor sensitivity of CCD6r and 6g.

6b enters each sensor 13. This allows each sensor 1
3, each color is read and photoelectrically converted.

Therefore, the color separation prism 5 and the imaging lens 4 are no longer necessary, and the adjustment of the imaging position of these is no longer necessary.
The optical system itself is also much simpler. Furthermore, since the optical fiber 12 can be bent in any way, there are fewer restrictions on the design of the image input device, and there is also the effect of increasing the degree of freedom in design. Note that the amount of light can be adjusted using the one-color filter 11.
r.

It is possible to select not only the light transmittance of 11g and 11b but also the diameter of the optical fiber.

〔Effect of the invention〕

As is clear from the above explanation, the light guiding means for guiding the light transmitted through the original or reflected from the original is composed of optical fibers provided in one-to-one correspondence with the photoelectric conversion elements. According to the invention as set forth in claim 1, the color separation means for color-separating the optical image guided by the means is constituted by a color filter provided between the optical fiber and the photoelectric conversion element. is no longer necessary, and the optical image transmitted through or reflected from the original is simply guided to the photoelectric conversion element for each color for photoelectric conversion, making the optical system simple and easy to adjust.

Further, according to the invention according to claim 2, the color filter also serves as a light amount adjustment filter for adjusting the amount of light transmitted through the color filter.
Since there is no need to separately provide a trimming filter or a light amount adjustment filter, the same effects as the invention described in claim 1 can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an image input device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the relationship between an optical fiber, a color filter, and a CCD according to the embodiment. FIG. 3 is a schematic configuration diagram showing a conventional human-powered image device. In the figure, 1 is a light source, 3 is a condensing lens, and 6, 6r. 6g, 6b are CCD (photoelectric conversion elements), 7 is a film original, lor, log, 10b is an optical fiber group, 11r
. 11g, llb are color filters, 12.12r, 12
g, 12b is an optical fiber, and 13 is a sensor. Patent applicant: Fujitsu General Co., Ltd. Representative, Patent attorney: Takuya Ohara Figure r D Figure 1? figure

Claims (2)

[Claims] (1) A light source, an irradiation means for irradiating the original to be read with the irradiation light emitted from the light source, a light guiding means for guiding the light transmitted through the original, and a light image guided by the light guiding means In the image input device, the light guiding means is equipped with a photoelectric conversion element that reads and photoelectrically converts an optical image of each color separated by the same color separation means, wherein the light guiding means is connected to the photoelectric conversion element. An image input device comprising a plurality of optical fibers provided in one-to-one correspondence, and wherein the color separation means comprises a color filter provided between the optical fiber and the photoelectric conversion element. . (2) The image input device according to claim 1, wherein the color filter also serves as a light amount adjustment filter that adjusts the amount of light transmitted according to the density of the color.