JPH08201629A - Surface reflected light removing device - Google Patents

Abstract

PURPOSE: To provide a surface reflected light removing device removing the surface reflected light of a reflecting original. CONSTITUTION: This device possesses a light source 12, a first polarizing filter 18 passing the specified component of light from the light source 12 in a polarization direction, a half mirror 20 irradiating an original 2 with the output light of the first polarizing filter 18 and outputting the reflected light from the original 2 and a second polarizing filter 24 passing the component other than the specified component of the output light of an optical means in the polarization direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface reflection light removing device suitable for an image reading device and the like.

[0002]

2. Description of the Prior Art FIG.
A sectional view of the image original 2 is shown. This image original 2 is
It is a printed image such as a photograph, which can be recognized by light reflected from the outside and enters human eyes, and is generally called a reflection original. The image original 2 is composed of a transparent coating layer 4 on the front side and an image forming layer 6.
When light is incident on such a reflective original 2, a part of the components is reflected on the surface and the rest is absorbed inside the original. The absorbed light reaches the image forming layer 6, and is partially reflected and the rest is absorbed. The image forming layer 6 is a portion where an image is formed on a medium such as paper with a color pigment or the like. The reflected light 8 reflected by the surface of the coating layer 4 is white light,
The image reflected light 10 reflected by the image forming layer 6 is a light that represents the color of the image. For example, in the red pigment portion, the green and blue components are absorbed and only the red light is reflected. Therefore, the human eye recognizes the mixed light of the surface reflected light 8 (white light) and the image reflected light 10 (for example, red light) from the image forming layer 6, so that the saturation and density of the image are Will be insufficient. As described above, since the reflection original includes the surface reflection light, the color reproducibility tends to be insufficient. Therefore, it is difficult for an image scanner device or the like to read the image information of a reflective original with high quality, and therefore a transparent original such as a photographic film is often used.

An object of the present invention is to provide a surface reflection light removing device for removing the surface reflection light of a reflection original.

[0004]

A surface reflected light removing apparatus of the present invention comprises a light source 12, a first polarizing filter 18 for passing a specific polarization direction component of light from the light source, and a first polarizing filter of the first polarizing filter. An optical unit (half mirror) 20 that irradiates the original with the output light and outputs the reflected light from the original, and a second polarization filter 24 that passes components other than the specific polarization direction component of the output light of the optical unit. It is characterized by including and.

[0005]

FIG. 1 is a schematic diagram showing the structure of an embodiment of the present invention. White light generated from a light source 12 such as a halogen lamp is converted into parallel light by a collimating lens 16 through a pinhole 14, and the first polarizing filter 1
Only light polarized in one predetermined direction by 8 passes.
The polarized light passes through the half mirror 20 and is applied to the reflected image original 2 via the focusing lens 22. The white light emitted to the reflection image original 2 is partly reflected on the surface and becomes surface reflection light, and the external component is absorbed by the image 2,
Light of a color corresponding to the color of the image is reflected by the image forming layer of the image 2. For example, in the green image portion, green light is reflected and red and blue lights are absorbed. As described above, the reflected light from the reflected image original 2 is a mixture of the surface reflected light and the image reflected light. However, in the device of FIG.
Since the light emitted by the polarization filter 18 is the light polarized in the predetermined direction, the surface reflected light is also the light polarized in the predetermined direction. On the other hand, the image reflected light passes through the surface layer of the reflected image original 2 and is reflected by the internal image forming layer, so that the polarization direction changes in various ways. Absent. These surface reflected light and image reflected light are
The focusing lens 22 is moved backward, and the light reflected by the half mirror 20 is received by the second polarization filter 24. The second polarization filter 24 transmits only light having a predetermined polarization direction, and transmits only light having a polarization direction different from the polarization direction of the transmitted light of the first polarization filter 18.
Therefore, the surface-reflected light maintaining the polarization direction by the first polarization filter 18 is blocked, and the light transmitted through the second polarization filter 24 is only the predetermined polarization component in the image reflection light. In this way, it is possible to output only the information from the image original and remove the surface reflected light.

FIG. 2 is a schematic diagram showing the configuration of the second embodiment of the present invention. The components corresponding to those in the embodiment of FIG. 1 are designated by the same reference numerals. The basic operation of the apparatus of FIGS. 1 and 2 is exactly the same, except that the half mirror 2
Only the arrangement relationship of each part regarding 0 is shown. That is, the light from the light source 12 passes through the pinhole 14, the collimating lens 16 and the first polarizing filter 18 and then the half mirror 2
The component reflected by 0 is applied to the reflected image original 2 through the focusing lens 22, and the reflected light from the image original 2 is only the component that passes through the lens 22 and the half mirror 20 and the second polarization filter 24. Is output. Since the operation of each unit is the same as that of the apparatus of FIG. 1, further description will be omitted.

The preferred embodiment of the present invention has been described above.
It will be apparent to those skilled in the art that the present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the gist of the present invention.

[0008]

According to the present invention, since the surface reflected light of the reflecting original can be removed, output light containing high quality image information can be easily obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of one embodiment of the present invention.

FIG. 2 is a schematic diagram showing the configuration of another embodiment of the present invention.

FIG. 3 is a cross-sectional view for explaining how light is reflected and reflected by a reflective original.

[Explanation of symbols]

 2 Reflective Image Original 12 Light Source 18 First Polarizing Filter 20 Half Mirror (Optical Means) 24 Second Polarizing Filter

Claims (3)

[Claims] 1. A light source, a first polarization filter that allows a specific polarization direction component of the light from the light source to pass, and an output light of the first polarization filter that irradiates an original document and outputs reflected light from the original document. And a second polarization filter that allows components other than the specific polarization direction component of the output light of the optical unit to pass therethrough. 2. The optical means includes a half mirror that reflects the output light of the first polarizing filter to irradiate the image original and transmits the reflected light from the original to output the half mirror. The surface reflected light removing device according to claim 1. 3. The optical means includes a half mirror that transmits the output light of the first polarization filter to irradiate the image original and reflects the reflected light from the original to output. The surface reflected light removing device according to claim 1.