JPH05328035A - Lamp unit for reflection and transmission reading and lamp unit for reflection reading - Google Patents

Abstract

(57) [Summary] [Purpose] Color reflective originals and transparent originals can be read without the need for a scattering plate. Further, by making it possible to irradiate the reflection original with each desired color light in a state in which the irradiation angles thereof are uniform, it is possible to improve color reproducibility even in an original having a float. [Structure] The dichroic mirrors 24, 25, 26 color-separate the light from the light sources 21, 22, 23 to obtain blue, red, and green light from the light sources. The desired color light is reflected and transmitted by the dielectric beam splitter 27 to irradiate the reflected original 12A with the reflected light and the transmitted original 12B with the transmitted light. Therefore, no scattering plate is required.
It should be noted that the blue, red, and green color lights obtained from the dichroic mirrors 24, 25, and 26 are arranged in the same direction so that the reflection original 1
By irradiating 2A, it is possible to improve the color reproducibility of a floating original.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflective and transmissive reading lamp unit and a reflective reading lamp unit.

[0002]

2. Description of the Related Art When reading a document with a document reading device,
As the reading method, there are a reading method using reflected light and a reading method using transmitted light, depending on the type of the original (reflection original or transparent original). The applicant has already proposed a technique in which these reading methods can be arbitrarily selected in Japanese Patent Application Laid-Open No. 61-21672. According to the technique proposed in this publication, FIG.
As shown in FIG. 3, the light from the light source 10 is scattered by the scattering plate 11 to irradiate the original 12, and the transmitted light from the original is read by the light receiving element 15 via the reflecting mirror 13 and the lens 14. In this case, when a plurality of light sources 10 such as red (R), blue (B), and green (G) are required for reading a color original, the transparent original is handled by coping with the difference in irradiation angle of each color light. In order to read, the light is scattered by the scattering plate 11.

In reading a color original, R,
A method of using various filters as a method of color-separating each color light of G, B, etc., that is, by filtering reflected light from a color original document, only information in a specific wavelength range is taken out and the color of the color original document is extracted. Some of them are decomposed (for example, Japanese Patent Publication No. 62-62101).

[0004]

Here, there is a demand for a technique that does not require the scattering plate when reading a color original, but there is a problem that there is no technique that can effectively respond to this. Further, in the method of color separation using a filter, since the irradiation angles of R, G, B, and the like on the original document are different from each other, as shown in FIG. 5, the original may float (away from the reference plane). However, there is a problem that the light amount balance between the color lights is lost and the color reproducibility is deteriorated (the color of the separated color light is added to the shade).

The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a reflective and transmissive reading lamp unit capable of reading color originals without the need for a scattering plate. This is the first issue. A second object of the present invention is to provide a reflective reading lamp unit capable of improving the color reproducibility of a floating document.

[0006]

According to the present invention, in a lamp unit provided in a reading apparatus for a reflective original and a transparent original, a light source and a die for color-separating the light from the light source to obtain light of a desired color from the light source. By providing a clock mirror and a dielectric beam splitter for reflecting and transmitting the obtained desired color light to irradiate the reflected original with the reflected light and to irradiate the transmitted original with the transmitted light, To solve the problem of. Further, in the present invention, a plurality of dichroic mirrors are provided so that a plurality of desired color lights can be obtained, and the respective desired color lights obtained from the respective dichroic mirrors can be applied to the reflective original in the same direction.

Further, according to the present invention, in a lamp unit provided in a reflection original reading device, a light source, and a plurality of dichroic mirrors for color-separating the light source to obtain light of a plurality of desired colors from the light source. The second problem is solved by irradiating the reflection original with the desired color lights obtained from the dichroic mirrors in the same direction.

[0008]

In the present invention, the light source light is color-separated by the dichroic mirror to obtain light of a desired color from the light source light. The desired color light is reflected and transmitted by the dielectric beam splitter to irradiate the reflected light to the color reflection original and the transmitted light to the color transmission original. Therefore, it is possible to read a reflective original and a transparent original without using a scattering plate. In the present invention, a plurality of dichroic mirrors are provided so that a plurality of desired color lights can be obtained, and the desired color lights obtained from the respective dichroic mirrors are applied to the reflective original in the same direction. The color reproducibility of a floating original can be improved.

Further, in the present invention, light source light is color-separated by a plurality of dichroic mirrors to obtain light of a plurality of desired colors from the light source light. The desired color lights obtained from the respective dichroic mirrors are applied to the color reflection original in the same direction. Therefore, each desired color light can be applied to the reflective original document in a state where the irradiation angles thereof are uniform, so that the color reproducibility can be improved even for a reflective original document having a floating surface.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the present invention,
It is a reading device provided with an example of a reflective and transparent original reading lamp unit according to the present invention. The reader is
It has a lamp unit 1, a scanner unit 2, a reflection unit 3, and a transmission unit 4.

The lamp unit 1 includes a white or blue light source 21, a white or red light source 22, a white or green light source 23, and blue (B) light obtained by color-separating each light source.
The dichroic mirrors 24, 25, and 26 that reflect and disperse light, red (R) light, and green (G) light, respectively, are provided. The dichroic mirrors 24, 25, and 26 are arranged so that the respective reflected lights are aligned in the same direction and are incident on the dielectric beam splitter 27.

The scanner unit 2 is provided with a dielectric beam splitter 27, a total reflection mirror 28, and a reflection unit 3. Dielectric beam splitter 27
Reflects incident B, R, G light by 50%,
While being transmitted, the reflected light is incident on the reflective original 12A, and the transmitted light is incident on the transparent original 12B.

The reflection unit 3 includes a mirror 29 for totally reflecting the reflected light from the color reflection original 12A, a reflection reading lens (which is provided with an infrared ray removing filter) 30 for condensing the reflected light, and a collecting unit. A light receiving element 31 for reflection that converts the reflected light that has been emitted into an electric signal is provided.

The transmission unit 4 includes a mirror 32 that totally reflects the transmitted light from the color transparent original 12B, a transmissive reading lens (which is provided with an infrared ray removing filter) 33 that collects the transmitted light, and a collection unit. A light receiving element for transmission 34 that converts the transmitted light that has been emitted into an electric signal is provided. The reflection unit 3 and the transmission unit 4 move in synchronization with each other.

In the reading apparatus of FIG. 1, in the lamp unit 1, the light from the light sources 21, 22, and 23 is reflected by the dichroic mirrors 24, 25, and 26, and B,
It becomes R and G lights, which are incident on the dielectric beam splitter 27 at the same angle. The beam splitter 27 reflects 50% of the incident light and transmits 50% thereof. The reflected light from the beam splitter 27 is used when reading the reflective original 12A. That is, in the reflection unit 3, the reflected light from the reflection original 12A is reflected by the mirror 29, and the reflected light image is formed on the light receiving element 31 via the lens 30. The transmitted light of the beam splitter 27 is used when reading the transparent original 12B. That is, the transparent original 12B is bent into a light beam that is perpendicular to the transparent original 12B and passes through the transparent original 12. The light transmitted through the transparent original 12 is condensed by the lens 33 in the transmissive unit 4 to form a transmitted light image on the light receiving element 34. The reflection unit 3 and the transmission unit 4 read the originals 12A and 12B, respectively, while moving in synchronization. Therefore, it is possible to read a reflective original and a transparent original without using a scattering plate.

The die lock mirrors 24, 25, 26
A plurality of dichroic mirrors 24, 25, 26
Since the B, R, and G lights obtained from the above are applied to the reflection original 12A in the same direction, the color reproducibility of the original 12A can be improved even when the original 12A is floating.

Next, a second embodiment will be described. Figure 2
Is a second embodiment and is a reflection reading apparatus provided with an example of the reflection reading lamp unit of the present invention.
The reading device includes a lamp unit 40, a scanner unit 41, and a reflection unit 42.

The lamp unit 40 is obtained by further providing a partition plate 40A on the lamp unit 1 shown in FIG. The other parts are the same, and the same numbers are given to the respective parts. Further, the reflection unit 42 is similar to the reflection unit in FIG. 1, and the same numbers are given to the respective parts.

In the reading device of FIG. 2, each light source 21, 2
The light from 2, 23 is dichroic mirrors 24, 25,
The optical path is changed to a predetermined angle by 26. In this case, the die lock mirrors 24, 25, and 26 are 4
Installed with a 5 degree inclination, each separation color (B, R,
The optical path of G) is bent. Each of the bent lights is reflected by the original 12A, passes through the mirror 29 and the lens, and forms an image on the light receiving element 31. In this state, the scanner unit 4
When 1 moves, the reflection original 12A is read.

A modified example of the second embodiment is shown in FIG. In FIG. 3, a reflection mirror 43 is further provided to bend the optical path of the irradiation light of the lamp unit 40 and irradiate the original 12A.
As a result, it is not necessary to tilt the lamp unit 40, and the scanner unit 41 is downsized.

[0021]

As described above, according to the present invention,
It is possible to read reflective originals and transparent originals without the need for a scattering plate. In the present invention, a plurality of dichroic mirrors are provided so that a plurality of desired color lights can be obtained,
By irradiating the reflection original with the respective desired color lights obtained from the respective dichroic mirrors in the same direction, the color reproducibility of the floating reflection original can be improved. Further, according to the present invention, since the reflection original can be irradiated with each desired color light in a state in which the irradiation angles thereof are uniform, excellent effects such as improvement of color reproducibility even with a reflection original having floating can be obtained.

[Brief description of drawings]

FIG. 1 is a first embodiment of the present invention, and is a configuration explanatory diagram of a reading device provided with an example of a reflection and transmission original reading lamp unit according to the present invention.

FIG. 2 is a second embodiment of the present invention, and is a structural explanatory view of a reflection reading device provided with an example of the reflection reading lamp unit of the present invention.

FIG. 3 is a structural explanatory view of a modified example of the reflection reading device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp unit 2 Scanner unit 3 Reflection unit 4 Transmission unit 12A Reflection document 12B Transmission document 21, 22, 23 Light source 24, 25, 26 Dichroic mirror 27 Dielectric beam splitter 31 Reflection light receiving element 34 Transmission light receiving element 40 Lamp unit 41 Scanner Unit 42 Reflection Unit

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[Procedure amendment]

[Submission date] February 17, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a first embodiment of the present invention, and is a configuration explanatory view of a reading device provided with an example of a lamp unit for reading a reflective and transparent original according to the present invention.

FIG. 2 is a second embodiment of the present invention, and is a structural explanatory view of a reflection reading device provided with an example of the reflection reading lamp unit of the present invention.

FIG. 3 is a structural explanatory view of a modified example of the reflection reading device of FIG.

FIG. 4 is an explanatory diagram of a configuration example of a conventional document reading apparatus.
Is.

FIG. 5 is an explanatory diagram of color separation by a filter.
It

[Explanation of reference numerals] 1 lamp unit 2 scanner unit 3 reflection unit 4 transmission unit 12A reflection original 12B transmission original 21, 22, 23, light source 24, 25, 26, dichroic mirror 27 derivative beam splitter 31 reflection light receiving element 34 transmission Light receiving element 40 Lamp unit 41 Scanner unit 42 Reflecting unit

Claims (3)

[Claims] 1. A lamp unit provided in a reading apparatus for a reflective original and a transparent original, a light source, a dichroic mirror for color-separating the light from the light source to obtain light of a desired color from the light source, and the obtained desired light. A reflective and transmissive reading lamp unit comprising: a dielectric beam splitter for reflecting and transmitting color light, irradiating the reflective original with the reflected light, and irradiating the transparent original with the transmitted light. 2. The reflection original according to claim 1, wherein a plurality of dichroic mirrors are provided so as to obtain a plurality of desired color lights, and the desired color lights obtained from the respective dichroic mirrors are arranged in the same direction. A lamp unit for reflective and transmissive reading, characterized in that the lamp unit is adapted to irradiate the same. 3. A lamp unit provided in a reflection original reading device, comprising: a light source; and a plurality of dichroic mirrors for color-separating the light from the light source to obtain light of a plurality of desired colors from the light source. A reflection reading lamp unit characterized in that each desired color light obtained from a dichroic mirror is directed to the reflection original in a uniform direction.