JPH09205527A - Image reception device with illuminating light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the image reception device by which an image pickup object face is lighted uniformly by an illuminating light source without unevenness, in which a normal reflection light from the light source is not entered in a light receiving face of the image reception device and offering ease of handling and whose size is made small. SOLUTION: Two illuminating light sources 27, 27' with reflecting shades 34, 34' light up an image pickup object face 2 receptively to the right side or the left side only substantially and the reflecting shades 34, 34' are shaped to have an elliptic cross section and a parabolic cross section. Direct optical cut means 38 are provided to the light sources 27, 27'. The position and the posture of the image reception device 25 having a light receiving face 5 and the light sources 27, 27' are adjusted with respect to n original platen 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera or a digital still camera which has a document table on which a photograph, a document, a three-dimensional object, etc., which constitutes a surface to be imaged is placed, and a light-receiving surface for capturing the photograph, document, etc. The present invention relates to an image capturing device with an illumination light source, which is equipped with an image capturing means such as a camera and an illumination light source including a lamp for illuminating the surface to be imaged, and is suitable for presentations and the like.

[0002]

2. Description of the Related Art As an image capturing device with an illumination light source of this type, a device as shown in FIG. 12 is conventionally known. The image capturing device 70 with an illumination light source of the illustrated example has a document table 74 on which a photograph, a document, or the like forming the imaging target surface 72 is placed.
And the imaging target surface 7 is provided above the center of the original table 74.
An image capturing device 75 such as a video camera having a light receiving surface 85 for capturing the image 2 is held via an arm 80, and elongated fluorescent lamps for illuminating the image capturing target surface 72 are provided on both sides of the document table 74. A pair of left and right illumination light sources 7 having 78
7, 77 are held in parallel with the original table 74 via an arm 79. The illumination light source 78 and the arm 79 are rotatable in the left and right directions in a plane orthogonal to the original table 72.

In such an apparatus 70, when an image of the image pickup target surface 72 is taken, a photograph, an original document or the like forming the image pickup target surface 72 is usually positioned and placed on an original table 74, and illumination light sources 77, 77 are used. The position and orientation of the illumination light sources 77 and 77 are adjusted so that the image pickup target surface 72 is illuminated with uniform light, and then the image pickup device 75 performs the image pickup. The target surface 72 is imaged. In this case, the image of the image pickup target surface 72 is picked up by the image pickup element forming the light receiving surface 85 of the image capturing device 75 via the optical unit 76 having the objective lens 76a.

[0004]

In the conventional image capturing device 70 with an illumination light source as described above, when the image pickup target surface 72 has gloss, for example, the image pickup target surface 72 is illuminated from above. When illuminated by the light sources 77, 77, the specularly reflected light reflected by the imaging target surface 72 enters the light receiving surface 85 of the image capturing device 75. When the specularly reflected light enters the light receiving surface 85 in this way, a ghost occurs in the image and the image becomes unclear, and a desired image cannot be obtained.

In order to avoid such a problem, the illumination light source 77 and the arm 79 are usually used at the positions shown by phantom lines in the figure. . Therefore, there are problems that the device becomes large due to the arrangement of the two illumination light sources 77 and that it is inconvenient to carry.

The present invention has been made in view of the above problems, and an object thereof is to enable an illumination light source to uniformly and uniformly illuminate an image pickup target surface and to provide regular reflection from the illumination light source. An object of the present invention is to provide an image capturing device with an illumination light source, which can prevent light from entering the light receiving surface of the image capturing means, is easy to handle, and can be miniaturized.

[0007]

In order to achieve the above-mentioned object, the image capturing device with an illumination light source according to the present invention is constructed as shown in the conceptual diagrams of FIGS. 6 to 11. That is, basically, as shown in FIG. 6, a document table 4 on which the image capturing target surface 2 is set, a light receiving surface 5 for capturing the image capturing target surface 2, and the image capturing target surface are illuminated. And an illumination light source 7 for illuminating light, the light receiving surface 5 being outside the imaging target surface 2 in plan view, that is, the imaging target surface 2
The illumination light source 7 is arranged on the side opposite to the imaging target surface 2 with respect to the vertical surface 3 passing through one end of the above, and the illumination light source 7 is arranged on the same side as the light receiving surface 5 with respect to the imaging target surface 2.

By doing so, the illumination light source 7
It is possible to prevent specularly reflected light of the illumination light emitted from the light receiving surface 5. When the distortion of the image formed on the light receiving surface 5 does not substantially pose a problem, the light receiving surface 5 and the optical axis 3 ′ of the image pickup optical system 11 relative to the image pickup target surface 2 as shown in FIG. You may incline. In another preferred embodiment of the present invention, as shown in FIG. 7, the light receiving surface 5 is parallel to the image capturing target surface 2, and a real image of the image capturing target surface 2 is formed on the light receiving surface 5. Imaging optical system 1 for forming an image on top
The optical axis 1 is perpendicular to the surface 2 to be imaged (overlapping or parallel to the vertical surface 3).

By doing so, the image pickup target surface 2 imaged on the light receiving surface 5 by the image pickup optical system 11.
It is possible to prevent the distortion of the real image of. In another preferred embodiment, as shown in FIG. 8, a first light receiving surface 5 and a first illumination light source 7 are arranged on the left side of the first imaging target surface 2 in plan view, and In contrast to the above, a second imaging target surface 2 ′ is set on the left side of the first imaging target surface 2 and a second imaging target surface 2 ′ is arranged on the right side of the second imaging target surface 2 ′ in plan view. A light receiving surface 5'and a second illumination light source 7'are arranged, and the boundary between the first imaging target surface 2 and the second imaging target surface 2'is formed by the first illumination light source 7 as shown by the shaded area. Only the right side of the line (vertical plane 3) is substantially illuminated, and only the left side of the boundary line (vertical plane 3) is substantially illuminated by the second illumination light source 7. In addition, the first and second imaging target surfaces 2 and 2 ′ are continuously formed to form one imaging target area S as a whole. The said first and second light receiving surfaces 5 'is formed by one of the imaging device as a whole continuously.

By doing so, the optical axis of the image pickup optical system 11 can be set at the center of the image pickup symmetrical area S (position overlapping the vertical line 3). Further, in another preferable mode of the apparatus shown in FIG. 7, as shown in FIG. 9, the imaging target surface 2 independently forms one imaging target area S, and the light receiving surface 5 alone. An image sensor is formed.

By doing so, the entire image pickup symmetrical area S can be illuminated by one illumination light source 7. Further, in the preferred embodiment of the apparatus shown in FIG. 8, as shown in FIG.
3'and a reflective umbrella 14, 14 ', and the reflective umbrella 14,
14 'indicates that the reflected light from the umbrella end portion is the image pickup target surface 2,
They are made to cross each other by the time they reach 2 '.

By doing so, the illumination light source 7,
The reflected light from 7'can be focused only on the imaging target surfaces 2, 2 ', the illumination efficiency is improved, and the imaging target surfaces 2, 2'can be evenly and uniformly illuminated. Further, in the preferred embodiment of the apparatus shown in FIG. 10, as shown in FIG. 11, the light cutting means 15 is provided directly under the lamps 13 and 13 ′. In order to directly provide the light cutting means 15, a method of arranging a shielding plate below the lamps 13 and 13 ', or applying a paint that does not transmit light to the lower portions of the lamps 13 and 13' is adopted.

By doing so, the direct light from the first illumination light source 7 is directed to the second imaging symmetry plane 2'on the same side with respect to the boundary line (vertical plane 3), and the second The direct light from the illumination light source 7 ′ is blocked from traveling toward the first imaging symmetry plane 2 on the same side with respect to the boundary line (vertical plane 3), and the illumination light emitted from the illumination light sources 7 and 7 ′ is positive. The reflected light is the light receiving surface 5,
You can avoid going into 5 '. In another preferred embodiment of the device of the present invention, the reflectors 14 and 14 'are aspherical. The aspherical shape has an elliptical cross section, a parabola,
Including those that become hyperbolas.

In this case, in a more preferred embodiment, the reflecting umbrellas 14 and 14 'are elliptical in the first cross section perpendicular to the image pickup surface 2 passing through the two illumination light sources 7 and 7'. One of the focal points is made to substantially coincide with the filament of the lamp, and a second cross section perpendicular to the first cross section and perpendicular to the imaging target surface 2, 2'is a parabola, and the focus thereof is the lamp. It is located outside the filament of.

Here, as can be seen by referring to FIG. 3 showing a cross section of a reflector of an embodiment described later, FIG.
When viewed in an elliptical cross section, the light emitted from one focus Fa crosses so as to pass through the other focus Fb, and when viewed in the parabolic cross section of FIG. 3B, the light emitted from the focus F ′ is a parallel light ( Virtual line)
Therefore, the light emitted from the inside of the focus F ′ spreads to the outside. Therefore, if the reflector is configured as described above, the imaging target surfaces 2 and 2'can be uniformly and efficiently illuminated.

In a preferred embodiment of the apparatus of the present invention other than the above, the image capturing means having the light receiving surface and the illuminating light source can be adjusted in position and attitude with respect to the document table, and The illumination light source is attached to the image capturing means included. This makes the device very compact.

[0017] In a further preferred aspect, a first arm adapted to be rotatable in a plane orthogonal to the document table and a tip of the first arm are connected to the first arm. Second which is adapted to be rotatable in a plane orthogonal to each other
And an image capturing means having the light receiving surface and an illumination light source are rotatably attached to the second arm. Thereby, the image capturing means and the illumination light source can be set in arbitrary positions and postures with a relatively simple device configuration.

Further, a base end portion of the first arm is pivotally supported on one end portion of the document table, and an image capturing means having the light receiving surface and an illumination light source are provided by rotating the first arm. Since the and are overlapped with the original table, the apparatus can be downsized, and the apparatus can be easily carried.
This configuration has an effect that the base end portion of the arm does not interfere with the document as compared with the configuration in which the base end portion of the arm cannot be arranged at the end portion of the document table as shown in FIG.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an image capturing device with an illumination light source according to the present invention. The image capturing device 20 of the illustrated embodiment includes a document table 24 having a rectangular plan view on which a photograph, a document, or the like forming the imaging target surface 2 is placed,
The first arm 31 is pivotally supported at one corner (corner portion) of the document table 24 so as to be rotatable in a plane orthogonal to the document table 24 with an axis R parallel to the document table 24 as a central axis. The second arm 3 is attached to the tip of the first arm 31.
2 is rotatably supported so as to be rotatable in a plane orthogonal to the first arm 31 with the center line P of the first arm as a central axis line, and a video is attached to the tip of the second arm 32. Image capturing device 25 such as a camera and illumination light sources 27, 27 '
A cover 34 having an open lower surface that covers (described later) is rotatably supported about a center line Q of the second arm 32 as a center axis.

The image capturing device 25 is held in the cover 34, and the image capturing device 25 has a light receiving surface 5 composed of one image pickup element, as can be seen by referring to FIG. An optical unit 26 which is built-in and has an objective lens 26a for forming a real image of the imaging surface 2 on the light receiving surface 5 is attached to the lower part of the optical unit 26, and both sides of the optical unit 26 have a predetermined inclination angle. Lamps 33, 33 'close to the light source and aspherical reflectors 34, 3 described later
Illumination light sources 27 and 27 'having 4'are attached, and the filter 2 is provided below the illumination light sources 27 and 27'.
9, 29 'are attached. Also, the lamp 3
A coating 38 that does not transmit light is applied to the lower part of 3, 33 '. The paint 38 acts as a direct light cutting means.

The reflectors 34, 34 'have the two central illuminations 27 as shown in FIG. 3 (A) for the lateral center section and in FIG. 3 (B) for the longitudinal center section. ，
The cross section perpendicular to the imaging surface 2 passing through 27 'is an ellipse, and the focal point Fa of one of the cross sections is made substantially coincident with the filament 35 of the lamp 33 and is orthogonal to the cross section of the cross section. A vertical cross section perpendicular to the imaging target surface 2 is a parabola, and its focus Fa is the lamp 33.
Is located outside the filament 35 of the. The longitudinal axis of the filament 35 is arranged along the parabolic cross section in consideration of the shape of the reflector 34.

Under such a configuration, when the image capturing device 70 of the present embodiment is used to capture an image of the image capturing target surface 2, a photograph, a document or the like forming the image capturing target surface 2 is usually placed on the document table. The light receiving surface 5
Of the arms 31 and 32 and the image capturing device 25 so that is parallel to the imaging target surface 2 and the optical axis of the optical unit 26 overlaps with a vertical plane C passing through substantially the center of the imaging target surface 2. And the lighting source 27, 27 by appropriately adjusting the posture.
Is illuminated to illuminate the image capturing target surface 2, and the image capturing device 75 captures the image capturing target surface 72. As a result, the image of the image pickup target surface 2 is picked up by the image pickup element constituting the light receiving surface 85 of the image capturing device 75 via the optical unit 26.

Here, in this embodiment, the reflector 1
As 4, 14 ', those having an elliptical cross section and a parabolic cross section are used as described above. In general, when a spheroidal mirror is used as the reflector, the central portion usually becomes brighter and, as shown in FIG.
Becomes a circle, which is not suitable for uniformly illuminating the rectangular imaging target surface 2. Further, when a cylinder mirror having an elliptical cross section is used, as shown in FIG. 4B, when viewed in the elliptical cross section of FIG. 5A, light emitted from one focus Fa passes through another focus Fb. Thus, the entire area of the rectangular imaging target surface 2 can be covered, but the light is largely projected in the vertical direction (longitudinal direction), and the illumination efficiency is not good.

On the other hand, if the cross section orthogonal to the ellipse as in the present embodiment is further configured as a parabola as shown in FIG. 5B, a rectangular object to be imaged as shown in FIG. 5C. The entire area of the surface 2 can be uniformly and efficiently illuminated.

In the image capturing device 20 of the present embodiment having the above-mentioned configuration, as shown in FIG.
An illumination light source 27 is arranged on the left side of a vertical plane C that divides the imaging target surface 2 into two substantially, and an illumination light source 27 'is arranged on the right side of the vertical plane C symmetrically with the illumination light source 27' on the left side. Only the right side of the vertical plane C of the image pickup target surface 2 is substantially illuminated by the above, and the vertical plane C (boundary line) of the image pickup target surface 2 is set by the right illumination light source 27 '. Only the left side is substantially illuminated, and the imaging target surface 2 continuously forms one imaging target area S as a whole, and the light receiving surface 5 continues as a whole. It is formed by two image pickup elements.

By doing so, the reflector 3 goes out from the lamp 33, 33 'of the illumination light source 27, 27.
The light reflected by the umbrella ends of 4, 34 'crosses in the middle as shown by the broken line in FIG. 2, and the imaging target surface 2 (right half, left side) on the other side from the vertical plane C is crossed. Illuminate half).

The light reflected by the umbrella ends of the reflecting umbrellas 14 and 14 'are made to cross each other by the time they reach the image pickup target surfaces 2 and 2', so that the illumination light source 27,
The reflected light from 27 'can be focused only on the imaging target surfaces 2 and 2', the illumination efficiency is improved, and the imaging target surfaces 2 and 2'can be uniformly illuminated. Further, the light receiving surface 5 is parallel to the image pickup target surface 2, and the optical axis of (the objective lens 26a of) the optical unit 26 is perpendicular to the image pickup target surface 2 (overlaps with the vertical surface 3). Therefore, it is possible to prevent the real image of the imaging target surface 2 imaged on the light receiving surface 5 by the optical unit 11 from being distorted.

Since the paint 38 as a direct light cutting means is applied to the lower portions of the lamps 13 and 13 ', the direct light from the illumination light source 27 is applied to the left side of the vertical plane 3 of the image pickup symmetry plane 2. Direct light from the illumination light source 27 'is prevented from going to the right side of the vertical surface 3 of the imaging target surface 2 and the specular reflection light of the illumination light emitted from the illumination light sources 27, 27' is blocked. It can be prevented from entering the light receiving surface 5.

The image capturing device 25 and the illumination light sources 27, 27 'are rotatable about three axes (R, P, Q), and their positions and attitudes are adjusted with respect to the document table 24. Since the illumination light sources 27 and 27 'are attached to the image capturing device 25, the optimal position and orientation of the image capturing device and the illumination light sources 27 and 27' are as described above. Of the illumination light sources 27, 2 for the image capturing device 25
Since it is not necessary to adjust the position of 7 ', handling is simple and operability is improved. The illumination light sources 27, 2
7'is not necessarily attached to the image capturing device 25, and may be attached to another place such as the cover 34 or the second arm 32. Further, the positions and orientations of the illumination light sources 27 and 27 'with respect to the image capturing device 25 may be finely adjusted.

The base end of the first arm 31 is pivotally supported on one end of the original table 24, and the first arm 31, the second arm 32, and the image capturing device 25 are appropriately provided. As shown in FIG. 5, the image capturing device 25 in the cover 34 and the illumination light sources 27 and 27 'can be superposed on the document table 24 by rotating, so that the device can be downsized and can be carried easily. It will be easy.

[0031]

As can be understood from the above description, the image capturing apparatus with an illumination light source according to the present invention can evenly and uniformly illuminate the surface to be imaged by the illumination light source, and the image from the illumination light source can be uniformly illuminated. It is possible to prevent reflected light from entering the light receiving surface of the image capturing means, and moreover, it is easy to handle and has a small size.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an image capturing device with an illumination light source according to the present invention.

FIG. 2 is an enlarged front view showing a main part of the image capturing device shown in FIG.

3A and 3B show a reflector used in the image capturing apparatus shown in FIG. 1, where FIG. 3A is a horizontal center sectional view and FIG. 3B is a vertical center sectional view.

FIG. 4 is a diagram provided for explaining the operation of a reflector used in the image capturing device shown in FIG.

FIG. 5 is a perspective view showing a stored and transported state of the image capturing device shown in FIG.

FIG. 6 is a conceptual diagram corresponding to claim 1.

FIG. 7 is a conceptual diagram corresponding to claims 1 and 2.

FIG. 8 is a conceptual diagram corresponding to claims 1 and 3.

FIG. 9 is a conceptual diagram corresponding to claims 1, 2, and 4.

FIG. 10 is a conceptual diagram corresponding to claims 1, 2, 3 and 5.

FIG. 11 is a conceptual diagram corresponding to claims 1, 2, 3, 5 and 6.

FIG. 12 is a front view showing an example of a conventional image capturing device with an illumination light source.

[Explanation of symbols]

 2 ... Imaging target surface 5 ... Light receiving surface 20 ... Image capturing device with illumination light source 24 ... Document table 25 ... Image capturing device 26 ... Optical unit 27 ... Illumination light source 31 ... First arm 32 ... Second arm 33 ... Lamp 34 ... Reflecting umbrella 38 ... Paint (Direct light cutting means)

Claims (10)

[Claims] 1. An image capturing device with an illumination light source, comprising: a document table on which an image capturing target surface is set, a light receiving surface for capturing the image capturing target surface, and an illumination light source for illuminating the image capturing target surface. In the apparatus, the image receiving device with an illumination light source is characterized in that the light receiving surface and the illumination light source are arranged on the same side of the imaging target surface on the same side and outside thereof. 2. The light receiving surface is parallel to the imaging target surface, and an optical axis for forming a real image of the imaging target surface on the light receiving surface is perpendicular to the imaging target surface. The image capturing device with an illumination light source according to claim 1, further comprising an image pickup optical system. 3. A first light receiving surface and a first illumination light source are arranged on the left side of the first image pickup target surface in plan view, and symmetrically to the left side of the first image pickup target surface. And a second light receiving surface and a second illumination light source are arranged on the right side of the second image pickup target surface in plan view with respect to the second image pickup target surface. Substantially illuminates only the right side of the boundary line between the first imaging target surface and the second imaging target surface, and substantially illuminates only the left side of the boundary line by the second illumination light source. And the first and second imaging target surfaces continuously form one imaging target area as a whole, and the first imaging target area
The image capturing device with an illumination light source according to claim 2, wherein the second light receiving surface and the second light receiving surface are continuously formed as a whole by one image pickup element. 4. The illumination light source according to claim 2, wherein the image pickup target surface independently forms one image pickup target area, and the light receiving surface independently forms one image pickup element. Image capture device. 5. The illumination light source includes a lamp and a reflecting umbrella, and the reflecting umbrella is configured such that the reflected light from the umbrella end portion crosses each other by the time the light reaches the imaging target surface. The image capturing device with an illumination light source according to any one of claims 1 to 3. 6. The image capturing device with an illumination light source according to claim 5, wherein a light cutting means is provided directly below the lamp. 7. The image capturing device with an illumination light source according to claim 5, wherein the reflector has an aspherical shape. 8. A first cross section of the reflector, which is perpendicular to the surface to be imaged, is an ellipse, one focus of which is substantially aligned with the filament of the lamp, and the first cross section of the reflector has the same shape. The image capturing device with an illumination light source according to claim 7, wherein a second cross section, which is orthogonal to the surface to be imaged, is a parabola, and the focus is located outside the filament of the lamp. Device. 9. The image capturing device with an illumination light source according to claim 1, wherein the illumination light source is attached to an image capturing means having the light receiving surface. 10. An image capturing means having the light receiving surface and an illumination light source are supported by an arm whose base end is rotatably supported at one end of the original table, and the arm is rotated. The image capturing device with an illumination light source according to claim 9, wherein the image capturing device is superposed on the document table.