JP5399215B2 - Multi-lens camera device and electronic information device - Google Patents

Multi-lens camera device and electronic information device Download PDF

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JP5399215B2
JP5399215B2 JP2009263416A JP2009263416A JP5399215B2 JP 5399215 B2 JP5399215 B2 JP 5399215B2 JP 2009263416 A JP2009263416 A JP 2009263416A JP 2009263416 A JP2009263416 A JP 2009263416A JP 5399215 B2 JP5399215 B2 JP 5399215B2
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JP2011109484A (en
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義人 石末
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シャープ株式会社
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  The present invention relates to a multi-lens camera device having an imaging lens with a short overall lens length suitable for being incorporated in a mobile phone device or the like, and a digital video camera and a digital camera, for example, using this multi-eye camera device as an image input device in an imaging unit The present invention relates to an electronic information device such as a digital camera such as a still camera, an image input camera such as a surveillance camera, a scanner device, a facsimile device, a television phone device, and a camera-equipped mobile phone device.

  In recent years, digital still cameras using solid-state imaging devices represented by CCD (Charge Coupled Device) and CMOS (Complementary Metal Oxide Semiconductor) have been rapidly spread, and various digital still cameras have been developed. Miniaturization of this digital still camera is progressing year by year with the advancement of technology in solid-state imaging devices. Among them, a camera mounted on a portable information terminal, a mobile phone device, or the like is particularly required to be miniaturized due to the size limitation of the housing.

When the angle of view required for the camera is the same, the optical length of the lens is restricted by the size of the solid-state imaging device (diagonal length of the imaging region). In order to shorten the optical length of this lens, methods such as the use of a thin lens or a high refractive lens material can be considered, but there is a limit to the method of shortening the optical length of such a lens.
For this reason, if the solid-state imaging device is divided and a lens is provided for each divided area, the optical length of the lens can be shortened according to the divided ratio.

  The thin cameras described in Patent Documents 1 and 2 achieve thinning by including at least three sub cameras.

FIG. 5 is a perspective view showing a schematic configuration example of a conventional multi-lens camera device disclosed in Patent Documents 1 and 2. FIG. FIG. 6 is a perspective view showing a schematic configuration example of an image sensor substrate in the conventional multi-lens camera device of FIG. FIG. 7 is a longitudinal sectional view showing an example of the configuration of the main part of the conventional conventional multi-lens camera device of FIG.
5 to 7, a four-lens camera device 100 as a conventional multi-lens camera device includes an aperture stop array 102, a lens array 103, a flat plate 104 such as a transparent glass substrate, a light shielding mask 105, and an image sensor substrate 106. This is a sequentially stacked camera module.
The lens array 102 includes sub lenses 102a, 102b, 102c, and 102d for each sub camera.
The image pickup device substrate 106 is divided into four divided image pickup regions 106a, 106b, 106c and 106d by a light shielding mask 105 and is separated from each other, and each has a single color filter. The divided imaging areas 106a and 106b are G (green), and the divided imaging areas 106c and 106d are R (red) and B (blue), respectively. The incident light collected for each sub-lens is selectively transmitted through each color filter for each wavelength (each color) and imaged on a divided imaging region that exists directly under each sub-lens. . The sub lenses 102a and 102b form an image of G (green), the sub lens 102c forms an R (red) image, and the sub lens 102d forms an B (blue) image. Further, the stray light to the sub-cameras adjacent to each other is blocked by the light shielding mask 105.

  When each of the sub lenses 102a, 102b, 102c and 102d has the same specification, the position of the focal plane of R (red) formed by the sub lens 102c is G (green) formed by the sub lenses 102a and 102b. The position of the focal plane of B (blue) formed by the sub lens 102d is longer than the position of the focal plane of G (green) formed by the sub lenses 102a and 102b. short.

  Normally, when light rays having different wavelengths are incident, the position of the focal plane of the lens is different. According to Patent Documents 1 and 2, the imaging lens has an array shape, and describes a structure having a different color filter for each sub-camera.

Special table 2007-520166 WO2007 / 013250

In the conventional multi-lens camera device, the imaging region is arranged at the position of the focal plane by adjusting the distance between the lens region of the lens array 103 and the imaging region of the imaging element substrate 106 corresponding thereto. However, in the case of the conventional multi-lens camera device 100, the lenses of the lens array 103 have an array structure, and the imaging element substrate 106 is a divided imaging region. Therefore, a distance interval from the divided imaging region is set for each sub lens. It cannot be adjusted.
In the conventional multi-lens camera device disclosed in Patent Document 2, it is described that each lens is designed to have the best optical characteristics with respect to the wavelength of light transmitted through the corresponding color filter. However, no specific case has been shown.

  Usually, in the case of a lens having an array structure, the lens is molded by a so-called replica method. This is a method in which one male master mold is manufactured, and the master mold is transferred onto the lens arrangement position to create a female mold. With this transfer method, it is possible to reduce the cost of mold production by metal processing such as cutting and polishing. However, since the lens is a lens array, there has been a problem that the distance between the lens region and the imaging region cannot be optimized in accordance with the lens characteristics of each color filter.

  The present invention solves the above-mentioned conventional problems, and a multi-lens camera apparatus capable of improving the resolution by optimizing the distance between the lens area and the imaging area by matching the lens characteristics with the color filters of the respective colors. An object of the present invention is to provide an electronic information device such as a mobile phone device with a camera using the multi-eye camera device as an image input device in an imaging unit.

  Note that the focal plane changes depending on the color (wavelength) of light rays incident on the same lens. This is called chromatic aberration. Therefore, in a sensor having a color filter in a normal Bayer array, the focal plane is adjusted at a position where chromatic aberration is balanced. If it sees for every color, it is not necessarily the best focal plane. The chromatic aberration problem can be avoided by using a multi-lens structure and making a lens for each sensor with a different color filter. However, since the multiview lens has a lens array structure, it cannot focus on each lens. The purpose of the present invention is how to avoid it.

The multi-lens camera device of the present invention includes a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region. In the multi-lens camera device, the focal lengths of the at least two sub-lenses of the lens array with respect to the imaging region are different from each other, and each of the sub-lenses of the lens array is provided by a color filter of each color combined with the sub-lens. The focal plane position of the selectively transmitted wavelength ray is configured to be the same on the imaging region by the lens thickness having the same lens surface shape, thereby achieving the above object. Is done.

  The multi-lens camera device of the present invention includes a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region. In the multi-lens camera device in which the sub-lenses of the lens array are stacked, the focal plane positions of the wavelength rays selectively transmitted by the color filters of the respective colors combined with the sub-lenses are the same on the imaging region. Thus, the above object is achieved.

  Further preferably, in each of the sub-lenses of the lens array in the multi-lens camera device of the present invention, the position of the focal plane of the wavelength ray selectively transmitted by the color filter of each color combined with the sub-lens is on the imaging region. It is comprised so that it may become the same.

  Further preferably, each of the sub-lenses of the lens array in the multi-lens camera device of the present invention has a focal length that matches the wavelength characteristics of the color filter corresponding to the sub-lens.

  Furthermore, it is preferable that the distance from the subject-side lens surface of the sub lens in the multi-lens camera device of the present invention to the imaging region is matched with the focal length for each transmission wavelength of the color filter.

  Further preferably, in the multi-lens camera device of the present invention, the focal length or the position of the focal plane is set by the thickness of each sub-lens of the lens array.

  Further preferably, the thickness of the sub lens in the multi-lens camera device of the present invention is adjusted by at least one of a lens surface on the subject side of the sub lens and a lens surface on the imaging region side of the sub lens. It is.

  Still preferably, in a multi-lens camera device according to the present invention, when the number of stacked sub lenses is two, the lens for adjusting the focal length or the position of the focal plane is at least one of the first lens and the second lens. It is.

  Still preferably, in a multi-lens camera device according to the present invention, when the number of laminated sub lenses is three, the lens for adjusting the focal length or the position of the focal plane is the first lens, the second lens, and the third lens. At least one of them.

  Further preferably, the focal length or the position of the focal plane in the multi-lens camera device of the present invention depends on the thickness of the transparent parallel plate when a transparent parallel plate is provided between the lens array and the imaging region. It has been adjusted.

  Further preferably, the color filters in the multi-lens camera device of the present invention respectively have R (red), G (green), and B (blue) colors.

  Further preferably, the color filters in the multi-lens camera device of the present invention respectively have C (light blue), M (red purple), Y (yellow) and G (green) colors.

  Further, preferably, the plurality of imaging regions in the multi-lens camera device of the present invention are equally divided from the imaging region provided with a plurality of light receiving units that photoelectrically convert incident light from a subject to perform imaging.

  Furthermore, preferably, in the multi-lens camera device of the present invention, a plurality of imaging regions provided with a plurality of light receiving units that photoelectrically convert incident light from a subject and image them are provided on a substrate.

  Further, preferably, the multi-view camera device of the present invention has four imaging regions, and the same number of the sub lenses and the color filters are provided.

  An electronic information device according to the present invention uses the multi-lens camera device according to the present invention as an image input device in an imaging unit, thereby achieving the above object.

  With the above configuration, the operation of the present invention will be described below.

  When the angle of view required for the camera is the same, the optical length of the lens is restricted by the diagonal length of the imaging region. For this reason, in order to shorten the optical length (focal length) of the lens, if the imaging area is divided and a lens is provided for each divided area, the optical length (focal length) of the lens is shortened according to the divided ratio. The camera can be made thinner.

  In the present invention, each of the sub-lenses of the lens array is configured such that the position of the focal plane of the wavelength ray selectively transmitted by the color filters of the respective colors combined is the same on each imaging region of the solid-state imaging device. ing.

  This makes it possible to optimize the distance between the lens area and the imaging area (focal length) by matching the lens characteristics with the color filters of each color. As a result, an accurate lens having a focal length corresponding to each color of the color filter can be made, and chromatic aberration can be eliminated to achieve a high resolution. Therefore, it is possible to realize a multi-lens camera device that achieves both high resolution and thinning.

  As described above, according to the present invention, when the solid-state imaging device has a plurality of imaging regions and includes a plurality of sub-lenses corresponding to the respective imaging regions, one lens corresponding to the entire imaging region is provided. Compared to the above, the plurality of sub-lenses have a shorter focal length, and the camera can be made thinner. In addition, since the distance between the lens region and the imaging region (focal length) is optimized by matching the lens characteristics with each color filter, it is possible to eliminate chromatic aberration and achieve high resolution. As a result, a multi-lens camera device that achieves both high resolution and thinning can be realized at low cost.

It is a longitudinal cross-sectional view which shows the example of a principal part structure of the multi-lens camera apparatus in Embodiment 1 of this invention. It is a perspective view which shows the example of schematic structure of the multi-eye camera apparatus of FIG. FIG. 2 is a perspective view illustrating a schematic configuration example of an image sensor substrate in FIG. 1. As Embodiment 2 of this invention, it is a block diagram which shows the schematic structural example of the electronic information apparatus which used the 4 eye type camera apparatus 1 of Embodiment 1 of this invention for the imaging part. It is a perspective view which shows the example of schematic structure of the conventional multi-view camera apparatus currently disclosed by patent document 1,2. It is a perspective view which shows the example of schematic structure of the image pick-up element board | substrate in the conventional multi-view camera apparatus of FIG. It is a longitudinal cross-sectional view which shows the principal part structural example in the conventional conventional multi-view camera apparatus of FIG.

  Hereinafter, as a first embodiment of the multi-lens camera apparatus of the present invention, a case of a four-lens camera apparatus will be described, and for example, a camera-equipped mobile phone apparatus using the four-lens camera apparatus as an image input device in an imaging unit. Embodiment 2 of the electronic information device will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a longitudinal cross-sectional view showing an exemplary configuration of a main part of a multi-eye camera device according to Embodiment 1 of the present invention. FIG. 2 is a perspective view illustrating a schematic configuration example of the multi-lens camera device of FIG. 1. FIG. 3 is a perspective view illustrating a schematic configuration example of the image sensor substrate in FIG. 1.

  1 to 3, a four-lens camera device 1 as a multi-lens camera device is a camera module, and includes an aperture stop array 2 in which four openings for incident light apertures are formed at equal intervals, and four aperture stop arrays 2. A lens array 3 in which lens areas are formed corresponding to the openings, a flat plate 4 made of a transparent glass substrate, and imaging areas arranged corresponding to the four openings and the four lens areas, respectively. A light-shielding mask 5 arranged around the image pickup device 5 and an image pickup device substrate 6 divided into four image pickup regions.

  The lens array 3 includes four sub-lenses 3 a, 3 b, 3 c, and 3 d as lens areas that are equidistant from each other for each of the four sub-cameras that photoelectrically convert incident light from a subject to capture four corners of a virtual square in plan view. It is arranged at each position.

  The image pickup device substrate 6 is equally divided into four image pickup regions 6a, 6b, 6c and 6d. If a lens is provided for each of the divided imaging regions 6a, 6b, 6c, and 6d, the optical length (focal length) of the lens can be shortened according to the divided ratio, and the camera device can be thinned. Become. As a result, the four-lens camera device 1 that achieves both high resolution and thinning can be realized.

  Monochromatic color filters (not shown) are provided above the imaging regions 6a, 6b, 6c, and 6d of the imaging element substrate 6, respectively. For example, G (green) is disposed in the imaging regions 6a and 6b, and R (red) and B (blue) single color filters are disposed in this order in the imaging regions 6c and 6d. The incident light collected for each of the sub lenses 3a, 3b, 3c and 3d is selectively transmitted for each specific wavelength of each color by the color filter of each color, and each of the sub lenses 3a, 3b, 3c and Images are formed on the divided imaging regions 6a, 6b, 6c and 6d of the imaging device substrate 6 existing immediately below each of 3d. That is, the sub lenses 3a and 3b focus the G (green) incident light on the divided imaging regions 6a and 6b to form an image, the sub lens 3c is R (red), and the sub lens 3d is B (blue). Incident light is focused on the divided imaging regions 6c and 6d to form an image.

  The four imaging regions 6a, 6b, 6c, and 6d are optically isolated by the light shielding mask 5 arranged around the imaging regions 6a, 6b, 6c, and 6d of the imaging element substrate 6, respectively. The stray light to the adjacent sub-cameras of each color is blocked and the image quality can be improved.

  Here, the characteristic configuration of the present invention will be described in detail.

  The sub-lenses 3a, 3b, 3c, and 3d of the lens array 3 have the focal plane positions of the wavelength rays that are selectively transmitted by the color filters of the respective colors combined with the sub-lenses 3a, 3b, 3c, and 3d. , 6c and 6d are configured to be the same. More specifically, the first lens surface of the sub lens 3c is higher (more toward the subject) and the first lens surface of the sub lens 3d is lower (more imaged) than the first lens surfaces of the sub lenses 3a and 3b. It is closer to the area.

  In this case, each of the sub lenses 3a, 3b, 3c, and 3d of the lens array 3 has a lens focal length that matches the wavelength characteristics of the color filter of each color corresponding to each sub lens. For example, incident light passes through distances from the subject side lens surfaces (upper lens surfaces) of the sub lenses 3a, 3b, 3c, and 3d to the imaging regions 6a, 6b, 6c, and 6d of the corresponding imaging device substrate 6, respectively. It is optimized according to the lens focal length for each wavelength of the color filter. This lens focal length is optimized by the thickness of each of the sub lenses 3a, 3b, 3c and 3d of the lens array 3. In the case of FIG. 1, the difference between the thickness of the sub lens 3a and the thickness of the sub lens 3c is increased by the thickness t.

  The effect of adjusting the focal plane with the lens thickness by making the lens surfaces (lens regions) of the sub-lenses 3a, 3b, 3c, and 3d the same is advantageous in terms of the manufacturing method of the lens array 3. On the lens surface of the lens array 3, one master mold (male mold) is transferred at a predetermined pitch in order, and an array mold (female mold) is manufactured and molded. For example, it is usually difficult to manufacture a master type (male type) with an array. When the surface shape of each sub lens is different, an array mold cannot be manufactured by this method.

  At this time, by using a master type (male type) having the same shape as the lens surface shape of each of the sub lenses 3a, 3b, 3c, and 3d, what is the difference in the lens thickness of each of the sub lenses 3a, 3b, 3c, and 3d? As to whether to manufacture the lens surface, the stroke size when the lens surface shape is formed on the transparent lens resin material using the master mold (male mold) may be controlled.

  As described above, according to the first embodiment, the imaging element substrate 6 as the solid-state imaging element has the four imaging areas 6a, 6b, 6c, and 6d, and each of the imaging areas 6a, 6b, 6c, and 6d, respectively. When the sub lenses 3a, 3b, 3c and 3d are provided so as to correspond to the above, the focal length of the plurality of sub lenses is shortened compared to one large lens corresponding to the entire imaging region, and the camera is thin. Can be realized. The sub-lenses 3a, 3b, 3c, and 3d of the lens array 3 are such that the positions of the focal planes of the wavelength rays that are selectively transmitted by the color filters of the respective colors combined with the sub-lenses 3a, 3b, 3c, and 3d , 6b, 6c, and 6d are configured to be the same. This optimizes the distance (focal length) between the sub-lenses 3a, 3b, 3c, and 3d and the corresponding imaging regions 6a, 6b, 6c, and 6d according to the color filters of the respective colors. In addition, for each color of the color filter, an accurate lens having a focal length corresponding to the color can be formed, and chromatic aberration can be eliminated and high resolution can be achieved. Accordingly, it is possible to realize the four-lens camera device 1 that achieves both high resolution and thinning.

  The effect of the first embodiment is not limited to thinning, but is also effective when the light incident angle on the image sensor substrate 6 needs to be reduced (telecentricity).

  In addition, although specific Embodiment 1 of this invention was shown, this invention is not limited to the specific shape of the said Embodiment 1 shown previously, a numerical value, etc., In order to acquire a desired optical characteristic. Needless to say, each parameter can be changed as appropriate.

  In the first embodiment, the thickness of the sub lenses 3a, 3b, 3c, and 3d of the lens array 3 is adjusted by adjusting the subject lens surfaces (upper lens surfaces) of the sub lenses 3a, 3b, 3c, and 3d. However, the present invention is not limited to this, and the thickness of the sub lenses 3a, 3b, 3c and 3d is adjusted on the lens surface (lower lens surface) on the imaging region side of the sub lenses 3a, 3b, 3c and 3d. Also good. In short, the thickness of the sub lenses 3a, 3b, 3c, and 3d may be adjusted by the lens surface on the subject side of the sub lens or the lens surface on the imaging element substrate 6 side.

  Although not particularly described in the first embodiment, the sub-lenses 3a, 3b, 3c for adjusting the position of the focal plane and the sub-lenses 3a, 3b, 3c, and 3d are adjusted even when the number of the sub-lenses 3a, 3b, 3c, and 3d is two. 3d may be at least one of the first lens and the second lens. Although not particularly described in the first embodiment, the sub lenses 3a, 3b, 3c and the sub lenses 3a, 3b, 3c, and 3d for adjusting the position of the focal plane are also provided when the number of stacked sub lenses 3a, 3b, 3c, and 3d is three. 3d may be at least one of the first lens, the second lens, and the third lens.

  Furthermore, although not specifically described in the first embodiment, the lens focal lengths from the sub lenses 3a, 3b, 3c, and 3d to the imaging regions 6a, 6b, 6c, and 6d of the imaging device substrate 6 are as follows. In addition, it is possible to make overall adjustment according to the thickness of the parallel plate 4 such as a transparent glass substrate provided between the lens array 3 and the image pickup device substrate 6. That is, when a parallel plate 4 such as an image sensor protective glass is provided between the lens array 3 and the image sensor substrate 6, the parallel plate 4 may adjust the position of the focal plane.

  Furthermore, although not specifically described in the first embodiment, the colors of the color filters provided on the image sensor substrate 6 are not limited to the colors R (red), G (green), and B (blue). For example, C (light blue), M (red purple) Y, (yellow), and G (green) may be used.

  Furthermore, in the first embodiment, as the imaging element substrate 6 having a plurality of imaging areas, the case where the imaging area of one imaging element substrate 6 is divided into a plurality (here, four) is described. For example, multiple image sensors (multiple image areas) are mounted on a single substrate, and the distance (focal length) between each sub lens and the individual image elements (individual image areas) is adjusted. You can make it. Also in this case, the present invention is effective. That is, as a plurality of imaging regions (here, four imaging regions) of the imaging element substrate 6, a plurality of imaging regions provided with a plurality of light receiving units that photoelectrically convert incident light from a subject on the substrate are provided. It may be done.

  In the first embodiment, the description has been made using the four-eye camera device 1. However, the present invention is not limited to the four-eye camera device 1, and may be a two-eye type or a three-eye type, or a five-eye type or more camera device. It may be.

(Embodiment 2)
FIG. 4 is a block diagram illustrating a schematic configuration example of an electronic information device using the four-lens camera device 1 of the first embodiment of the present invention as an imaging unit as the second embodiment of the present invention.

  In FIG. 4, an electronic information device 90 according to the second embodiment includes a solid-state imaging device 91 that obtains a color image signal by performing predetermined signal processing on the imaging signal from the four-lens camera device 1 according to the first embodiment. A memory unit 92 such as a recording medium capable of recording data after processing a color image signal from the solid-state imaging device 91 for recording, and a predetermined signal for displaying the color image signal from the solid-state imaging device 91 The display means 93 such as a liquid crystal display device that can be displayed on a display screen such as a liquid crystal display screen after processing, and the color image signal from the solid-state imaging device 91 can be subjected to communication processing after predetermined signal processing for communication. A communication means 94 such as a transmission / reception device, and a printer capable of performing print processing after performing predetermined print signal processing for color image signals from the solid-state imaging device 91 for printing. And an image output unit 95. The electronic information device 90 is not limited to this, but in addition to the solid-state imaging device 91, at least one of a memory unit 92, a display unit 93, a communication unit 94, and an image output unit 95 such as a printer. You may have.

  As described above, the electronic information device 90 includes, for example, a digital camera such as a digital video camera and a digital still camera, an in-vehicle camera such as a surveillance camera, a door phone camera, and an in-vehicle rear surveillance camera, and a video phone camera. An electronic apparatus having an image input device such as an image input camera, a scanner device, a facsimile device, a camera-equipped personal computer, a camera-equipped mobile phone device, and a portable terminal device (PDA) is conceivable.

  Therefore, according to the second embodiment, on the basis of the color image signal from the solid-state imaging device 91, it is displayed on the display screen, or is printed out on the paper by the image output means 95. (Printing), communicating this as communication data in a wired or wireless manner, performing a predetermined data compression process in the memory unit 92 and storing it in a good manner, or performing various data processings satisfactorily Can do.

  In the first embodiment, the image pickup device substrate 6 having four image pickup areas 6a, 6b, 6c, and 6d, and a color filter having a predetermined color arrangement disposed in each of the image pickup areas 6a, 6b, 6c, and 6d ( (Not shown) and a four-lens camera device 1 including a lens array 3 provided with sub lenses 3a, 3b, 3c, and 3d corresponding to the imaging regions 6a, 6b, 6c, and 6d, The sub-lenses 3a, 3b, 3c, and 3d of the lens array 3 are wavelength light beams that are selectively transmitted by color filters (not shown) of the respective colors combined with the sub-lenses 3a, 3b, 3c, and 3d, respectively. The case where the focal plane position is configured to be the same on each of the imaging regions 6a, 6b, 6c, and 6d of the imaging device substrate 6 has been described. Not limited to this, even when the focal lengths of at least two sub-lenses of the lens array 3 with respect to the imaging region are different from each other, an accurate sub-lens having a focal length corresponding to the color of the color filter can be produced, and chromatic aberration can be reduced. Without it, high resolution can be achieved. Accordingly, it is possible to achieve the object of the present invention to improve the resolution by optimizing the distance between the lens area and the imaging area by matching the lens characteristics with the color filters of the respective colors.

  As mentioned above, although this invention was illustrated using preferable Embodiment 1, 2 of this invention, this invention should not be limited and limited to this Embodiment 1,2. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge, from the description of specific preferred embodiments 1 and 2 of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  The present invention relates to a multi-lens camera device having an imaging lens with a short overall lens length suitable for being incorporated in a mobile phone device or the like, and a digital video camera and a digital camera, for example, using this multi-eye camera device as an image input device in an imaging unit In the field of electronic information equipment such as digital cameras such as still cameras, image input cameras such as surveillance cameras, scanner devices, facsimile devices, television telephone devices, and mobile phone devices with cameras, solid-state image sensors have multiple imaging areas. If a plurality of sub lenses are provided to correspond to each imaging region, the focal length of the plurality of sub lenses is shortened compared to one lens corresponding to the entire imaging region. The camera can be thinned. In addition, since the distance between the lens region and the imaging region (focal length) is optimized by matching the lens characteristics with each color filter, it is possible to eliminate chromatic aberration and achieve high resolution. As a result, a multi-lens camera device that achieves both high resolution and thinning can be realized at low cost. Thus, the multi-lens camera device according to the present invention can be suitably used for an imaging device such as a digital still camera. Further, it can be particularly preferably used for a small imaging device suitable for portable use. Specifically, a digital camera mounted on a portable information terminal, a mobile phone device, or the like can be given.

1 4-eye camera device (multi-eye camera device)
2 Aperture stop array 3 Lens array 3a, 3b, 3c, 3d Sub-lens 4 Planar plate 5 Shading mask 6 Imaging element substrate (solid-state imaging element)
6a, 6b, 6c, 6d Divided imaging area 7a Light beam imaged by sub lens 6a 7c Light beam imaged by sub lens 6c 90 Electronic information device 91 Solid-state imaging device 92 Memory unit 93 Display means 94 Communication means 95 Image output means

Claims (14)

  1. In a multi-lens camera device in which a plurality of imaging regions, a color filter of each color arranged for each imaging region, and a lens array provided with each sub lens corresponding to each imaging region are stacked,
    The focal lengths of the at least two sub-lenses of the lens array with respect to the imaging region are different from each other;
    Each of the sub-lenses of the lens array has a focal plane position of a wavelength ray selectively transmitted by a color filter of each color combined with the sub-lens on the imaging region by a lens thickness having the same lens surface shape. A multi-lens camera device configured to be the same.
  2. Multiview camera apparatus according to sub-lens respectively, according to claim 1 having a focal length matching the wavelength characteristics of the color filters corresponding to the sub-lens of the lens array.
  3. The multi-lens camera device according to claim 2 , wherein a distance from a subject-side lens surface of the sub lens to the imaging region is matched with a focal length for each transmission wavelength of the color filter.
  4. The multi-lens camera device according to claim 1, wherein the focal length or the position of the focal plane is set by a thickness of each sub lens of the lens array.
  5. The multi-lens camera device according to claim 4 , wherein the thickness of the sub lens is adjusted by at least one of a lens surface on the subject side of the sub lens and a lens surface on the imaging region side of the sub lens. .
  6. Wherein when the number of stacked sub-lens is two, the focal length or lens to adjust the position of the focal plane, the multi-eye camera system according to claim 1 is at least one of the first lens and the second lens .
  7. Wherein when the number of stacked sub-lens is a three, the focal length or lens to adjust the position of the focal plane, the first lens, to claim 1, wherein at least either of the second lens and the third lens The multi-lens camera device described.
  8. The multi-view according to claim 1 , wherein the focal length or the position of the focal plane is adjusted by a thickness of the transparent parallel plate when a transparent parallel plate is provided between the lens array and the imaging region. Camera device.
  9. The multi-view camera device according to claim 1 , wherein each of the color filters has a color of R (red), G (green), and B (blue).
  10. The multi-view camera apparatus according to claim 1 , wherein each of the color filters has C (light blue), M (red purple), Y (yellow), and G (green).
  11. The multi-lens camera device according to claim 1 , wherein the plurality of imaging regions are equally divided from an imaging region provided with a plurality of light receiving units that photoelectrically convert incident light from a subject.
  12. The multi-lens camera device according to claim 1 , wherein a plurality of imaging regions each provided with a plurality of light receiving units that photoelectrically convert incident light from a subject to perform imaging are provided on a substrate.
  13.   The multi-view camera device according to claim 1, wherein there are four imaging regions, and the same number of the sub lenses and the color filters are provided.
  14. Electronic information device using the imaging unit the multi-eye camera apparatus according to any one of claims 1 to 13 as an image input device.
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