KR100246578B1 - Image receiving apparatus having light source - Google Patents

Abstract

The illumination light source makes it possible to uniformly illuminate the object to be photographed without light spots, and prevents the specularly reflected light from the illumination light source from entering the light receiving surface of the camera unit. Provided is an image capture device with an illumination light source.

The imaging target surface 2 is substantially illuminated by the two illumination light sources 27 and 27 'having the reflection shades 34 and 34', respectively, on the right side and the left side only, and the reflection shade 34, The 34 'is formed into an elliptical cross section and a parabolic cross section, and direct light blocking means 38 and 38 are provided in the illumination light sources 27 and 27'. The position and attitude of the camera unit 25 having the light receiving surface 5 and the illumination light sources 27 and 27 'can be adjusted with respect to the document glass 24.

Description

Image receiving apparatus having light source

According to the present invention, a camera unit 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 the photographing object is placed, a light receiving surface for photographing the photograph or the document, and the photographing object surface The present invention relates to an image taking apparatus with an illumination light source suitable for use in presentations and the like, having an illumination light source consisting of a lamp for illuminating the light.

As an image taking device with an illumination light source of this kind, a conventional one as shown in Fig. 12 is known. The image pick-up apparatus 70 with the illumination light source of an example is provided with the document glass 74 in which the photograph, document, etc. which comprise the imaging object surface 72 are placed, and the said imaging object surface above the center of this document glass 74 is carried out. A camera unit 75 such as a video camera having a light receiving surface 85 for imaging 72 is supported through an arm 80, and the imaging target surface 72 is provided on both sides of the platen 74. As shown in FIG. A pair of left and right illumination light sources 77 and 77 having elongated fluorescent lamps 78 for illumination are supported in parallel with the document glass 74 via an arm 79.

The illumination light source 77 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 camera unit 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 camera unit 75 via the optical unit 76 having the objective lens 76a.

As described above, in the conventional image pick-up apparatus 70 with the illumination light source, when the imaging target surface 72 has a 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 typically used at positions shown in phantom lines.

Therefore, there is a problem that the device is enlarged for disposition 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 the above problems, and an object thereof is that an illumination light source can uniformly illuminate an imaging target surface without light spots, and at the same time, specular reflection light from an illumination light source is applied to a light receiving surface of a camera unit. It is an object of the present invention to provide an image capturing apparatus with an illumination light source that can be prevented from entering and that can be easily handled and downsized.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of an image taking apparatus with an 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 shade 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 reflection shade 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.

6 is a conceptual diagram corresponding to claim 1.

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

8 is a conceptual diagram corresponding to claim 1 and claim 3.

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

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

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

12 is a front view showing an example of a conventional image pick-up apparatus with an illumination light source.

<Description of the symbols for the main parts of the drawings>

2 ...

5.Receiving surface

20.Image taking device with light source

24.Original glass

25.Camera Unit

26 ... optical unit

27.Light source

31.First Arm

32.2nd arm

33.Lamp

34 ... Reflection

38.Paint (direct light blocking means)

In order to achieve the above object, the image taking apparatus with an illumination light source according to the present invention has a configuration as shown in the conceptual diagram of FIGS. 6 to 11.

That is, basically, as shown in Fig. 6, 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 An illumination light source 7 for illuminating the surface, wherein the light-receiving surface 5 is viewed in plane with respect to the imaging target surface 2, that is, a vertical plane 3 passing outside of the imaging target surface 2, one end of the imaging target surface 2. At the same time, the illumination light source 7 is disposed on the same side as the light receiving surface 5 with respect to the image capturing surface 2.

In this way, 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. When the distortion of the image formed on the light receiving surface 5 is not substantially a problem, the optical axis 3 'of the light receiving surface 5 and the imaging optical system 11 is placed on the imaging target surface 2 as shown in FIG. You may incline with respect to it.

As another preferred embodiment of the present invention, as shown in Fig. 7, the light receiving surface 5 is parallel to the image capturing surface 2, and the image of the image capturing surface 2 The optical axis of the imaging optical system 11 for forming on the light receiving surface 5 is perpendicular to the imaging target surface 2 (overlapping or parallel to the vertical surface 3).

In this way, distortion can be prevented from occurring on the actual image of the imaging target surface 2 formed by the imaging optical system 11 on the light receiving surface 5.

Further, in another preferred embodiment, as shown in FIG. 8, the first light receiving surface 5 and the first illumination light source 7 are arranged on the left side of the first imaging target surface 2 in plan view. The second imaging target surface 2 'is set on the left side of the first imaging target surface 2 symmetrically with them, and the second imaging target surface 2' is viewed in a plane with respect to the second imaging target surface 2 '. The light receiving surface 5 'and the second illumination light source 7' are disposed, and as shown by the oblique portions, the first imaging target surface 2 and the second imaging target surface (by the first illumination light source 7) Only the right side of the boundary line (vertical surface 3) of 2 ') is substantially illuminated, and only the left side of the boundary line (vertical surface 3) is substantially illuminated by the second illumination light source 7, The first and second image capturing surfaces 2 and 2 'continuously form one image capturing region S as a whole, and the first and second light receiving surfaces 5 and 5'. ) In succession Typically it is formed by one imaging device.

By doing in this way, the optical axis of the said imaging optical system 11 can be set to the center (position overlapping with the vertical line 3) of the imaging object area | region S. As shown in FIG.

In another preferred embodiment of the apparatus shown in FIG. 7, as shown in FIG. 9, the image capturing surface 2 alone forms one image capturing region S, and the light receiving surface 5 This alone forms one imaging device.

By doing in this way, the whole imaging object area | region S can be illuminated by one illumination light source 7.

In addition, in the preferred embodiment of the apparatus shown in FIG. 8, the illumination light sources 7, 7 ′ are lamps 13, 13 ′ and reflector 14, 14 as shown in FIG. 10. '), And the reflection shades 14 and 14' cross each other until the reflected light from the shade ends reaches the imaging target surfaces 2 and 2 '.

In this way, the reflected light from the illumination light sources 7 and 7 'can be condensed on the imaging target surfaces 2 and 2' in a limited way, and the illumination efficiency is improved while the imaging target surfaces 2 and (2) ') Can be uniformly illuminated without spots.

In the preferred embodiment of the apparatus shown in FIG. 10, the direct light blocking means 15 is provided below the lamps 13 and 13 ′ as shown in FIG. 11. In order to provide the direct light blocking means 15, a shielding plate may be disposed below the lamps 13 and 13 ', or a coating may be applied to prevent light from passing through the lamps 13 and 13'. Are employed.

In this way, the direct light from the first illumination light source 7 is directed toward the second imaging target surface 2 'on the same side with respect to the boundary line (vertical plane 3), and from the second illumination light source 7'. Direct light is prevented from facing the first imaging target surface 2 on the same side with respect to the boundary line (vertical surface 3), and the specular reflection light of the illumination light emitted from the illumination light sources 7 and 7 'is received on the light receiving surface 5. You can prevent it from entering (5 ').

One preferred embodiment of the device of the present invention is that the reflector shades 14, 14 'are aspherical in shape. Aspherical shapes include those in which the cross-sectional shape becomes an ellipse, parabola, hyperbola, or the like.

In this case, in a more preferred embodiment, the first cross section perpendicular to the imaging target surface 2 through which the reflecting shades 14 and 14 'pass the two illumination light sources 7 and 7' is an ellipse. The focal point is substantially coincident with the filament of the lamp, and a second cross section perpendicular to the imaging target surfaces 2, 2 'perpendicular to the first cross section is a parabola, and the focus is on the lamp. Is located on the outside of the filament.

Referring to FIG. 3, which is a cross-sectional view of the reflector of the embodiment described below, as can be seen from the elliptical cross-section of FIG. 3A, the light from one focal Fa is the other focal point ( Intersecting so as to pass through Fb), and the light from the focal point F 'becomes parallel light (virtual line) when viewed in the parabolic cross section of Fig. 3B, the light from the inner side of the focal point F' is outside. Spreads. Therefore, if the reflector is configured as described above, the imaging target surfaces 2 and 2 'can be uniformly and efficiently illuminated without light spots.

In a preferred embodiment of the present invention other than the above, the camera unit and the illumination light source having the light receiving surface can adjust their position and attitude with respect to the platen, and the camera unit and the illumination light source having the light receiving surface. All of these are installed in one cover.

This makes the device extremely compact.

In a more preferred embodiment, the first arm can rotate in a plane orthogonal to the platen and connected to the distal end of the first arm so that it can rotate in a plane orthogonal to the first arm. A camera unit having a second arm and an illumination light source are rotatably attached in a state of being embedded in a cover coupled to the second arm. This allows the camera unit and the illumination light source to take arbitrary positions and poses under relatively simple device configurations.

Further, the base end of the first arm is axially supported at one end of the document glass, and by turning the first arm, the camera unit having the light receiving surface and the illumination light source overlap the document glass, thereby miniaturizing the device. It is planned and is easy to carry. This configuration has the effect that the proximal end of the arm does not interfere with the original, as compared with the constitution in which the proximal end of the arm cannot be disposed at the end of the original table as shown in FIG.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings.

1 shows an embodiment of an image capture device with an illumination light source according to the present invention.

The image taking device 20 of this embodiment includes a document glass 24 that is rectangular in view of a plane on which photographs, documents, and the like constituting the imaging target surface 2 are placed, and one corner of the document glass 24 is provided. The first arm 31 is pivotally supported to be rotatable in a plane orthogonal to the document glass 24 with the axis R in the first direction parallel to the document glass 24 as the center axis. At the tip of the first arm 31, the second arm 32 is attached to the first arm 31 in a second direction different from the first direction, that is, the center line P of the first arm as the central axis. The lower surface is pivotally supported so as to be rotatable in a plane perpendicular to the second arm 32 and covers the camera unit 25 such as a video camera and the illumination light sources 27 and 27 'described later on the tip of the second arm 32. The covered cover 39 is pivotally rotatable with the center line Q of the second arm 32 as the center axis.

The camera unit 25 is supported in the cover 39, and the camera unit 25 has a light receiving surface 5 made of one imaging device, as can be seen with reference to FIG. 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 at the lower portion thereof, and having predetermined inclination angles at both sides thereof. Lamps 33 and 33 'close to the point light source and illumination light sources 27 and 27' having aspherical reflection shades 34 and 34 ', which will be described later, are combined. The filters 29 and 29 'are attached below 27 and 27'.

In addition, a paint 38 which does not allow light to pass through is applied to the lower portions of the lamps 33 and 33 '. The paint 38 acts as occupation light blocking means.

The two reflection light sources 34, 34 'have a transverse central cross section in Fig. 3A and a longitudinal central cross section in Fig. 3B. 27), the transverse cross section perpendicular to the imaging target surface 2 passing through the 27 'is an ellipse so that one focal point Fa almost coincides with the filament 35 of the lamp 33. Moreover, the longitudinal cross section perpendicular | vertical to the imaging object surface 2 orthogonal to the said cross section is parabolic, and the focal point Fa is located outside the filament 35 of the said lamp 33. Moreover, as shown in FIG. In addition, the longitudinal axis of the filament 35 is arranged to follow the parabolic cross section in consideration of the shape of the reflection shade 34.

Under such a configuration, in capturing the image capturing surface 2 using the image taking device 20 of the present embodiment, a photograph, a document, or the like constituting the image capturing surface 2 is normally positioned at the center of the document table 24. And 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 and the vertical surface C. The position and posture of the arms 31, 32 and the camera unit 25 are properly adjusted so as to overlap, and the illumination light sources 27, 27 'are turned on to illuminate the imaging target surface 2 while illuminating the camera. The unit 25 captures the imaging target surface 2. As a result, the image of the imaging target surface 2 is picked up by the imaging unit constituting the light receiving surface 5 of the camera unit 25 via the optical unit 26.

Here, in this embodiment, as the reflection shades 14 and 14 ', those having an elliptical cross section and a parabolic cross section are used as described above. In general, when the rotary ellipsoid is used as the reflector, the center is brightened, and as shown in FIG. 4A, the illumination region E becomes circular to uniformly illuminate the rectangular image pickup surface 2. Not suitable for In addition, when the cylinder diameter of the elliptical section is used, as shown in (B) of FIG. 4, when viewed from the elliptical cross section of FIG. Although the whole area | region of the imaging target surface 2 of can be covered, light is largely pushed out in an up-down direction (length direction), and lighting efficiency is not good.

On the other hand, if the cross section orthogonal to the ellipse is constituted by the parabolic cross section as shown in Fig. 5B as in the present embodiment, the entire area of the rectangular image pickup target surface 2 can be uniformly and efficiently illuminated as shown in Fig. 5C.

In the image taking device 20 of the present embodiment having the configuration as described above, when the cover 39 is in the first position as shown in FIG. 2 for imaging, the imaging target surface 2 is almost two. The illumination light source 27 is inclined to the left than the vertical plane C to be divided, and the illumination light source 27 ′ is disposed to the right of the vertical plane C to be symmetrical with the illumination plane 27, to the left illumination light source 27. Only the right side of the imaging surface 2 is substantially illuminated than the vertical surface C, and the vertical surface C of the imaging surface 2 is bordered by the illumination light source 27 'on the right side. Only the left side is to be substantially illuminated, and the imaging target surface 2 continuously forms one imaging target region S as a whole, and the light receiving surface 5 continuously performs one imaging as a whole. It is formed by an element.

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

The light reflected from the lampshades of the reflection shades 34 and 34 'intersects each other until reaching the imaging target surfaces 2 and 2', thereby providing illumination light sources 27 and 27 '. Can be condensed to the imaging target surfaces 2 and 2 'with limited light, and the illumination efficiency can be improved and the imaging surfaces 2 and 2' can be uniformly illuminated without light spots. .

Further, when the cover 39 is in the first position, the light receiving surface 5 is parallel to the imaging target surface 2, and the optical unit 26, specifically, the objective lens of the optical unit 26. Since the optical axis of 26a is perpendicular to the imaging target surface 2 (overlaps with the vertical surface 3), the actual image of the imaging target surface 2 formed by the optical unit 26 on the light receiving surface 5 is formed. The distortion can be prevented from occurring.

Since the paint 38 as direct light blocking 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 pointing toward 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 camera unit 25 and the illumination light sources 27, 27 'are rotatable in three axes (R, P, Q), so that the position and attitude of the document glass 24 can be adjusted. In addition, since the illumination light sources 27 and 27 'are attached to the camera unit 25, the optimum positions and the details of the camera unit and the illumination light sources 27 and 27' are as described above. Since the posture can be easily taken, and the positions of the illumination light sources 27 and 27 'with respect to the camera unit 25 need not be adjusted, handling is simplified and the operability is improved. In addition, the illumination light sources 27 and 27 'do not necessarily need to be attached to the camera unit 25, and may be attached to other places, such as the cover 39 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 camera unit 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 camera unit 25 are properly rotated. As shown in FIG. 5, when the cover 39 is positioned at the second position for storage, the camera unit 25, the illumination light sources 27, 27 ′ in the cover 39 are placed on the document glass 24. ), The device can be miniaturized, and transportation is simplified.

As can be seen from the above description, the image pick-up apparatus with the illumination light source of the present invention can illuminate the imaging target surface uniformly by the illumination light source, and the specular reflection light from the illumination light source enters the light receiving surface of the camera unit. It is possible to prevent it from going, and it is easy to handle, so that it can be miniaturized.

Claims (8)

An image taking apparatus with an illumination light source comprising a document glass on which an imaging target surface is set, a camera unit having an imaging optical system and a light receiving surface for imaging the imaging target surface, and an illumination light source for illuminating the imaging target surface. , The first arm is pivotally coupled to the platen with a pivot in a first direction, and the first arm is pivotally coupled with a pivot in a direction different from the axis in the first direction to the first arm. And a second arm to be coupled to the cover and coupled to the second arm, The illumination light source and the camera unit are both installed inside the cover, The cover has a first position in which the light receiving surface and the illumination light source of the camera unit are disposed outwardly from the same side in plan view with respect to the imaging target surface by the rotation of the first arm and the second arm. An illumination light source image pickup apparatus, characterized in that configured to be positioned in a second position overlapping the original glass. The method of claim 1, When the cover is in the first position, the light receiving surface is parallel to the imaging target surface, and an optical axis of an imaging optical system for forming an image of the imaging target surface on the light receiving surface is relative to the imaging target surface. An image capture device with an illumination light source, characterized in that it is vertical. The method of claim 2, The first light receiving surface and the first illumination light source are disposed on the left side of the first imaging target surface in plan view, and the second imaging target surface is set on the left side of the first imaging target surface symmetrically with them. The second light receiving surface and the second illumination light source are disposed on the right side of the second imaging target surface in plan view, and only the right side of the second imaging target surface is above the boundary line between the first imaging target surface and the second imaging target surface. At the same time, the second illumination light source substantially illuminates only the left side of the boundary line, and the first imaging target surface and the second imaging target surface are successively formed as a whole. And the first light receiving surface and the second light receiving surface are successively formed by one imaging device as a whole. The method of claim 2, And the light receiving surface forms one imaging element alone, while the imaging target surface alone forms one imaging region. The method according to any one of claims 1 to 3, And said illumination light source has a lamp and a reflection shade, and said reflection shade intersects each other until the reflected light from the shade end reaches said image pickup target surface. The method of claim 5, Direct light blocking means is provided under the lamp, characterized in that the image capture device with a light source. The method of claim 5, And said reflection shade is aspherical in shape. The method of claim 7, wherein The reflection shade has a first end face perpendicular to the imaging target surface that is an ellipse, and its focus is substantially coincident with the filament of the lamp, and the second cross section perpendicular to the imaging target surface perpendicular to the first cross section. The image taking device with an illumination light source characterized in that it becomes a parabola and the focus is located outside the filament of the lamp.