KR100215115B1 - Image receiving apparatus having a light source - Google Patents

Abstract

The illumination light source makes it possible to uniformly illuminate the imaging target surface and prevents the specularly reflected light from the illumination light source from entering the light receiving surface of the image taking means. Provided is an image capture device with a light source.

The document table 4 on which the imaging target surface 2 is set, the light receiving surface 5 for imaging the imaging target surface 2, and the imaging target surface 2 on the light receiving surface 5; An imaging optical system 11 for forming an actual image, and an illumination light source 7 for illuminating the imaging object surface 2, wherein the imaging optical system 11 and the illumination light source 7 are the imaging object surface. The optical axis 3 'of the imaging optical system 11 is inclined with respect to the surface 3 perpendicular to the imaging target surface, while being arranged in the plane on the same side with respect to (2).

Description

Image capture device with illumination light source

The present invention provides an image taking means such as a video camera or a digital still camera having a document table on which a photograph, a document, a three-dimensional object, etc. constituting an imaging target surface is placed, a light receiving surface for photographing the photograph or the document, and the like The present invention relates to an image light-injecting device with an illumination light source suitable for providing a presentation with an illumination light source consisting of a lamp or the like for illuminating a surface.

As an image pick-up apparatus with an illumination light source of this kind, what is conventionally shown in Fig. 7 is known. The illuminating light source image pick-up apparatus 70 of the example of illustration is equipped with the document glass 74 in which the photograph, the document, etc. which comprise the imaging object surface 72 are located, and the said imaging object surface above the center of this document glass 74 is carried out. An image taking device 75 such as a video camera having a light receiving surface 85 for imaging 72 is held through an arm 80, and the imaging target surface 72 is provided on both sides of the platen 74. A pair of left and right illumination light sources 77 and 77 having an elongated fluorescent lamp 78 for illuminating the light is held in parallel with the document glass 74 through an arm 79.

The illumination light source 78 and the arm 79 are each rotatable in the horizontal direction in the plane orthogonal to the platen 72.

In such an apparatus 70, in imaging the imaging target surface 72, a photograph, an original, or the like constituting the imaging target surface 72 is usually positioned on the document table 74, and the illumination light source 77 And (77) illuminate the imaging target surface 72 and at the same time adjust the position and attitude of the illumination light sources 77 and 77 so that uniform light is irradiated onto the imaging target surface 72. The image capturing device 75 picks up the imaging target surface 72.

In this case, the image of the imaging target surface 72 is picked up by the imaging element constituting the light receiving surface 85 of the image taking device 75 via the optical unit 76 having the objective lens 76a.

As described above, in the conventional image pick-up apparatus 70 with an illumination light source, when the imaging target surface 72 has gloss, for example, the imaging target surface 72 is placed from above the illumination light source 77. When irradiated with, 77, the specularly reflected light reflected from the imaging target surface 72 enters the light receiving surface 85 of the image taking device 75. When specularly reflected light enters the light-receiving surface 85 in this manner, ghosts are generated in the image and become unclear, so that a desired image is not obtained.

In order to avoid such drawbacks, the illumination light source 77 and the arm 79 are usually used at the position indicated by the virtual line.

Therefore, there is a problem that the device is enlarged for the arrangement of the two illumination light sources 77, which is inconvenient to carry.

SUMMARY OF THE INVENTION The present invention has been made in view of these problems, and an object thereof is to uniformly illuminate an imaging target surface by an illumination light source, and at the same time, specular reflection light from the illumination light source enters the light receiving surface of the image taking means. The present invention provides an image light-injecting device with an illumination light source which can be prevented, and which can be easily handled and downsized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a premise embodiment of an illumination image attachment device with illumination light source according to the present invention.

Fig. 2 is an enlarged front view showing the main part of the image taking device shown in Fig. 1.

Fig. 3 shows a reflection umbrella used in the image taking device shown in Fig. 1, (A) is a transverse center cross-sectional view, and (B) is a longitudinal center cross-sectional view.

4 is a view provided for explaining the operation of the reflective umbrella used in the image taking device shown in FIG.

FIG. 5 is a perspective view showing a storing and transporting state of the image taking device shown in FIG.

Fig. 6 is a schematic configuration diagram showing one embodiment of the image capture device with illumination light source according to the present invention.

7 is a front view showing an example of a conventional image capturing apparatus with illumination light source.

* Explanation of the simple signs in the drawings

1.Image image capture device with illuminated light source

2 ...

3 ... vertical plane

3 '... optical axis

4 .... the original glass

5.Receiving surface

7.Light source

11 ... optical unit (imaging optical system)

In order to solve the above object, the present invention provides an image capture apparatus with an illumination light source, including a document table on which an imaging target surface is set, a light receiving surface for imaging the imaging target surface, and an image of the imaging target surface on the light receiving surface. And an illumination light source for illuminating the imaging target surface, wherein the imaging optical system is arranged to be biased from one side on the same side in plan view with respect to the imaging target surface, and furthermore, the illumination light source is arranged on the imaging target. It is arranged on the same side as the light receiving surface with respect to the surface, and the optical axis of the imaging optical system is inclined with respect to the surface perpendicular to the imaging target surface.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings. Fig. 1 shows an embodiment as a premise of an image capture device with illumination light source according to the present invention.

The image taking device 20 of the illustrated embodiment includes a document plate 24 that is rectangular in view of a plane on which photographs, documents, etc. constituting the imaging target surface 2 are placed, and one corner of the document table 24 is provided. The first arm 31 is pivotally supported on the corner part so as to be pivotable in an orthogonal plane with respect to the document glass 24, with the axis R parallel to the document glass 24 as the center axis. At the distal end of the first arm 31, the second arm 32 is pivotable in a plane perpendicular to the first arm 31 with the center line P of the first arm as the center axis. The cover 34 which is supported, and whose lower surface is opened at the distal end of the second arm 32 and covers the image taking device 25 such as a video camera and the illumination light sources 27, 27 'is provided in the second arm 32. The center line Q of the arm 32 is pivotally supported as the center axis line.

The image taking device 25 is held in the cover 34, and as shown in FIG. 2, the image taking device 25 includes a light receiving surface 5 made of one imaging device. Is incorporated therein, and an optical unit 26 having an objective lens 26a or the like for forming an image of the imaging target surface 2 on the light-receiving surface 5 is coupled to the lower portion thereof, each of which is provided at both sides thereof. Lamps 33 and 33 'which are close to the point light source with an inclination angle of and illumination light sources 27 and 27' having aspherical reflective umbrellas 34 and 34 'which will be described later are attached. Filters 29 and 29 'are attached below the illumination light sources 27 and 27'.

In addition, a paint 38 that does not pass light is applied to the lower portions of the lamps 33 and 33 '. The paint 38 acts directly as an optical cut means.

The two reflective light sources 34, 34 'have a transverse central end in Fig. 3A and a longitudinal central cross section in Fig. 3B. The transverse cross section perpendicular to the image pickup target surface 2 passing through (27) and (27 ') is an ellipse so that one focal point (Fa) almost coincides with the filament (35) of the lamp (33). And a longitudinal cross section perpendicular to the imaging target surface 2 orthogonal to the cross section of the transverse cross section is made of radiation so that its focal Fa is located outside the filament 35 of the lamp 33. Is on. In addition, the longitudinal axis of the filament 35 is arranged to follow the radiation cross section in consideration of the shape of the reflective umbrella 34.

Under such a configuration, in capturing the image capturing surface 2 using the image taking device 70 of the present embodiment, a photograph, a document, or the like constituting the image capturing surface 2 is normally placed at the center of the document table 24. Positioning, the light receiving surface 5 is parallel to the imaging target surface 2, and the optical axis of the optical unit 26 passes through the center of the imaging target surface 2, vertically. The position and posture of the arms 31, 32 and the image taking device 25 are properly adjusted so as to overlap with each other, and the illumination light sources 27, 27 are turned on to illuminate the imaging target surface 2, The image capturing device 75 picks up the imaging target surface 72. As a result, the image of the imaging target surface 2 is picked up by the imaging unit constituting the light receiving surface 85 of the image taking device 75 via the optical unit 26.

Here, in the present embodiment, as described above, as the reflective umbrellas 14 and 14 ', those having an elliptical cross section and a parabolic cross section are used. In general, when the rotary ellipsoid is used as the reflective umbrella, the center is brightened, and as shown in FIG. 4A, the illumination region E becomes circular, and the rectangular image capturing surface 2 is uniform. Not suitable for lighting In addition, when the cylinder diameter of the elliptical cross section is used, as shown in (B) of FIG. 4, the light from one focal Fa passes through the other focal point Fb as seen in the elliptical cross section of FIG. 3A. It can cross so that it may cover the whole area | region of the rectangular image pickup object 2, but light is largely pushed out in the up-down direction (length direction), and lighting efficiency is not good.

On the other hand, if the cross section orthogonal to the ellipse is configured like the parabolic cross section as shown in Fig. 3B as shown in the present embodiment, the entire area of the rectangular imaging target surface 2 is uniform as shown in Fig. 4C. Lighting can be done efficiently.

In the image taking device 20 of the present embodiment having the above-described configuration, as shown in FIG. 2, the illumination light source 27 to the left of the vertical plane C that divides the imaging target surface 2 into almost two parts. The light source 27 'is disposed to be inclined and symmetrically to the right side of the vertical plane C, and the vertical plane C of the imaging target surface 2 is disposed by the left light source 27. Only the right side is substantially illuminated, and only the left side is substantially illuminated from the vertical plane C (boundary line) in the imaging target surface 2 by the illumination light source 27 'on the right side. The target surface 2 is continuously formed as a whole image pickup target area S, and the light receiving surface 5 is continuously formed as a whole as an image pickup device.

As a result, the light emitted from the lamps 33 and 33 'of the illumination light sources 27 and 27' and reflected at the umbrella ends of the reflective umbrellas 34 and 34 'is indicated by the broken line in FIG. As mentioned above, it crosses in the middle and irradiates the imaging object surface 2 (right half part, left half part) on the opposite side to the said vertical surface C. As shown in FIG.

The light reflected from the umbrella ends of the reflective umbrellas 14 and 14 'crosses each other until reaching the imaging target surfaces 2 and 2', thereby providing illumination light sources 27 and 27. The reflected light from ') can be condensed to the imaging target surfaces 2 and 2' in a limited manner, and the illumination efficiency can be improved and the imaging target surfaces 2 and 2 'can be uniformly illuminated.

Further, the light receiving surface 5 is parallel to the imaging target surface 2, and the optical axis of the optical unit 26 (objective lens 26a of the optical unit 26) is perpendicular to the imaging target surface 2 (vertical surface). 3), so that distortion can be prevented from occurring on the actual image of the object to be imaged 2 formed by the optical unit 11 on the light receiving surface 4.

Since paint 38 as direct light cut means is applied to the lower portions of the lamps 13 and 13 ', the direct light from the illumination light source 27 is directed toward the left side of the vertical plane 3 of the imaging target surface 2. And direct light from the illumination light source 27 'are prevented from being directed to the right portion of the vertical plane 3 in the imaging target surface 2, so that the specularly reflected light of the illumination light emitted from the illumination light sources 27 and 27' is received. The surface 5 can be prevented from entering.

In addition, the image taking device 25 and the illumination light sources 27 and 27 'are rotatable in three axes (R, P, Q), so that the position and attitude of the document table 24 can be adjusted. The illumination light sources 27 and 27 'are attached to the image taking device 25 so that the image taking device and the illumination light sources 27 and 27' are optimal as described above. It is possible to easily take the position and posture, and at the same time it is not necessary to adjust the position of the illumination light source 27, 27 'with respect to the image taking device 25, the handling is easy and the operability is improved. In addition, the illumination light sources 27 and 27 'do not necessarily need to be attached to the image taking device 25, and may be attached to other places, such as the cover 34 and the 2nd arm 32. As shown in FIG. Further, the positions and attitudes of the illumination light sources 27 and 27 'with respect to the image taking device 25 may be finely adjusted.

In addition, the proximal end of the first arm 31 is axially supported at one end of the platen 24 so that the first arm 31, the second arm 32, and the image taking device 25 are supported. 5, the image taking device 25 and the illumination light sources 27 and 27 'in the cover 34 can be superimposed on the document glass 24 as shown in FIG. Becomes simpler.

With respect to the illumination light source image capture device 20 according to the premise embodiment described above, an embodiment of the illumination light source image capture device according to the present invention includes an arrangement of an optical unit light receiving surface and an illumination light source constituting an imaging optical system, and the optical unit. The optical axis of is inclined with respect to the surface perpendicular | vertical to the imaging object surface.

That is, as shown in FIG. 6, the illumination image source attaching device 1 with the illumination light source according to the present embodiment captures the document table 4 on which the imaging target surface 2 is set, and the imaging target surface 2. Illuminating the optical unit 11 and the imaging target surface 2 constituting an imaging light emission system for forming an image receiving surface 5 for imaging the actual image of the imaging target surface 2 on the light receiving surface 5. Although the illumination light source 7 etc. to be provided are the same as that of the thing 20 of the said premise embodiment, the optical unit 6, the light receiving surface 5, and the illumination light source 7 which comprise an imaging optical system are respectively The optical units 6 constituting the imaging optical system are arranged on one side of the imaging target surface 2 in plan view, that is, on the same side as the optical unit 6 with respect to the imaging target surface 2. At the same time, the optical axis 3 ′ and the light receiving surface 5 of the optical unit 11 are perpendicular to the surface 3 perpendicular to the imaging target surface 2. Strabismus is on.

In addition, although not shown in particular, in this embodiment, the structure of that excepting the above, for example, the support form of the image taking-in apparatus 25 which incorporates the light receiving surface 5, the structure of a reflective umbrella, etc. are the same as that of the said premise embodiment. Done.

In the image capture device 1 with the illumination light source of the present embodiment having such a configuration, the imaging optical system and the illumination light source are disposed to be offset from one side on the same side in plan view with respect to the imaging target surface, and the optical unit ( By inclining the optical axis 3 'and the light receiving surface 5 of 11) with respect to the vertical surface 3, it is possible to prevent the specularly reflected light of the illumination light emitted from the illumination light source 7 from entering the light receiving surface 5, In addition, the entire imaging target surface 2 can be illuminated by one illumination light source 7.

As can be seen from the above description, the illumination light source image pick-up apparatus of the present invention can arrange and arrange the illumination light source in the vicinity of the image pick-up means, and at the same time, the specular reflection light from the illumination light source receives the image pick-up means. It can be prevented from entering the surface, and can be easily handled to achieve miniaturization.

Claims (1)

A document glass on which an imaging target surface is set, a light receiving surface for imaging the imaging target surface, an imaging optical system for forming an image of the imaging target surface on the light receiving surface, and an illumination light source for illuminating the imaging target surface In the image capture device with an illumination light source comprising: Wherein the imaging optical system and the illumination light source are disposed on the other side of the imaging target surface in a plane view on the other side, and the optical axis of the imaging optical system is inclined with respect to a surface perpendicular to the imaging target surface. Image capture device with an illumination light source.